Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-11 08:27:49 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-11 08:27:49 +0000
commit: ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
tree: b2d64bc10158fdd5497876388cd68142ca374ed3 /Documentation/gpu
parent: Initial commit. (diff)
download: linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
71 files changed, 17859 insertions, 0 deletions
diff --git a/Documentation/gpu/afbc.rst b/Documentation/gpu/afbc.rst
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index 0000000000..4d38dc49d1
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+.. SPDX-License-Identifier: GPL-2.0+
+
+===================================
+ Arm Framebuffer Compression (AFBC)
+===================================
+
+AFBC is a proprietary lossless image compression protocol and format.
+It provides fine-grained random access and minimizes the amount of
+data transferred between IP blocks.
+
+AFBC can be enabled on drivers which support it via use of the AFBC
+format modifiers defined in drm_fourcc.h. See DRM_FORMAT_MOD_ARM_AFBC(*).
+
+All users of the AFBC modifiers must follow the usage guidelines laid
+out in this document, to ensure compatibility across different AFBC
+producers and consumers.
+
+Components and Ordering
+=======================
+
+AFBC streams can contain several components - where a component
+corresponds to a color channel (i.e. R, G, B, X, A, Y, Cb, Cr).
+The assignment of input/output color channels must be consistent
+between the encoder and the decoder for correct operation, otherwise
+the consumer will interpret the decoded data incorrectly.
+
+Furthermore, when the lossless colorspace transform is used
+(AFBC_FORMAT_MOD_YTR, which should be enabled for RGB buffers for
+maximum compression efficiency), the component order must be:
+
+ * Component 0: R
+ * Component 1: G
+ * Component 2: B
+
+The component ordering is communicated via the fourcc code in the
+fourcc:modifier pair. In general, component '0' is considered to
+reside in the least-significant bits of the corresponding linear
+format. For example, COMP(bits):
+
+ * DRM_FORMAT_ABGR8888
+
+   * Component 0: R(8)
+   * Component 1: G(8)
+   * Component 2: B(8)
+   * Component 3: A(8)
+
+ * DRM_FORMAT_BGR888
+
+   * Component 0: R(8)
+   * Component 1: G(8)
+   * Component 2: B(8)
+
+ * DRM_FORMAT_YUYV
+
+   * Component 0: Y(8)
+   * Component 1: Cb(8, 2x1 subsampled)
+   * Component 2: Cr(8, 2x1 subsampled)
+
+In AFBC, 'X' components are not treated any differently from any other
+component. Therefore, an AFBC buffer with fourcc DRM_FORMAT_XBGR8888
+encodes with 4 components, like so:
+
+ * DRM_FORMAT_XBGR8888
+
+   * Component 0: R(8)
+   * Component 1: G(8)
+   * Component 2: B(8)
+   * Component 3: X(8)
+
+Please note, however, that the inclusion of a "wasted" 'X' channel is
+bad for compression efficiency, and so it's recommended to avoid
+formats containing 'X' bits. If a fourth component is
+required/expected by the encoder/decoder, then it is recommended to
+instead use an equivalent format with alpha, setting all alpha bits to
+'1'. If there is no requirement for a fourth component, then a format
+which doesn't include alpha can be used, e.g. DRM_FORMAT_BGR888.
+
+Number of Planes
+================
+
+Formats which are typically multi-planar in linear layouts (e.g. YUV
+420), can be encoded into one, or multiple, AFBC planes. As with
+component order, the encoder and decoder must agree about the number
+of planes in order to correctly decode the buffer. The fourcc code is
+used to determine the number of encoded planes in an AFBC buffer,
+matching the number of planes for the linear (unmodified) format.
+Within each plane, the component ordering also follows the fourcc
+code:
+
+For example:
+
+ * DRM_FORMAT_YUYV: nplanes = 1
+
+   * Plane 0:
+
+     * Component 0: Y(8)
+     * Component 1: Cb(8, 2x1 subsampled)
+     * Component 2: Cr(8, 2x1 subsampled)
+
+ * DRM_FORMAT_NV12: nplanes = 2
+
+   * Plane 0:
+
+     * Component 0: Y(8)
+
+   * Plane 1:
+
+     * Component 0: Cb(8, 2x1 subsampled)
+     * Component 1: Cr(8, 2x1 subsampled)
+
+Cross-device interoperability
+=============================
+
+For maximum compatibility across devices, the table below defines
+canonical formats for use between AFBC-enabled devices. Formats which
+are listed here must be used exactly as specified when using the AFBC
+modifiers. Formats which are not listed should be avoided.
+
+.. flat-table:: AFBC formats
+
+   * - Fourcc code
+     - Description
+     - Planes/Components
+
+   * - DRM_FORMAT_ABGR2101010
+     - 10-bit per component RGB, with 2-bit alpha
+     - Plane 0: 4 components
+              * Component 0: R(10)
+              * Component 1: G(10)
+              * Component 2: B(10)
+              * Component 3: A(2)
+
+   * - DRM_FORMAT_ABGR8888
+     - 8-bit per component RGB, with 8-bit alpha
+     - Plane 0: 4 components
+              * Component 0: R(8)
+              * Component 1: G(8)
+              * Component 2: B(8)
+              * Component 3: A(8)
+
+   * - DRM_FORMAT_BGR888
+     - 8-bit per component RGB
+     - Plane 0: 3 components
+              * Component 0: R(8)
+              * Component 1: G(8)
+              * Component 2: B(8)
+
+   * - DRM_FORMAT_BGR565
+     - 5/6-bit per component RGB
+     - Plane 0: 3 components
+              * Component 0: R(5)
+              * Component 1: G(6)
+              * Component 2: B(5)
+
+   * - DRM_FORMAT_ABGR1555
+     - 5-bit per component RGB, with 1-bit alpha
+     - Plane 0: 4 components
+              * Component 0: R(5)
+              * Component 1: G(5)
+              * Component 2: B(5)
+              * Component 3: A(1)
+
+   * - DRM_FORMAT_VUY888
+     - 8-bit per component YCbCr 444, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(8)
+              * Component 1: Cb(8)
+              * Component 2: Cr(8)
+
+   * - DRM_FORMAT_VUY101010
+     - 10-bit per component YCbCr 444, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(10)
+              * Component 1: Cb(10)
+              * Component 2: Cr(10)
+
+   * - DRM_FORMAT_YUYV
+     - 8-bit per component YCbCr 422, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(8)
+              * Component 1: Cb(8, 2x1 subsampled)
+              * Component 2: Cr(8, 2x1 subsampled)
+
+   * - DRM_FORMAT_NV16
+     - 8-bit per component YCbCr 422, two plane
+     - Plane 0: 1 component
+              * Component 0: Y(8)
+       Plane 1: 2 components
+              * Component 0: Cb(8, 2x1 subsampled)
+              * Component 1: Cr(8, 2x1 subsampled)
+
+   * - DRM_FORMAT_Y210
+     - 10-bit per component YCbCr 422, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(10)
+              * Component 1: Cb(10, 2x1 subsampled)
+              * Component 2: Cr(10, 2x1 subsampled)
+
+   * - DRM_FORMAT_P210
+     - 10-bit per component YCbCr 422, two plane
+     - Plane 0: 1 component
+              * Component 0: Y(10)
+       Plane 1: 2 components
+              * Component 0: Cb(10, 2x1 subsampled)
+              * Component 1: Cr(10, 2x1 subsampled)
+
+   * - DRM_FORMAT_YUV420_8BIT
+     - 8-bit per component YCbCr 420, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(8)
+              * Component 1: Cb(8, 2x2 subsampled)
+              * Component 2: Cr(8, 2x2 subsampled)
+
+   * - DRM_FORMAT_YUV420_10BIT
+     - 10-bit per component YCbCr 420, single plane
+     - Plane 0: 3 components
+              * Component 0: Y(10)
+              * Component 1: Cb(10, 2x2 subsampled)
+              * Component 2: Cr(10, 2x2 subsampled)
+
+   * - DRM_FORMAT_NV12
+     - 8-bit per component YCbCr 420, two plane
+     - Plane 0: 1 component
+              * Component 0: Y(8)
+       Plane 1: 2 components
+              * Component 0: Cb(8, 2x2 subsampled)
+              * Component 1: Cr(8, 2x2 subsampled)
+
+   * - DRM_FORMAT_P010
+     - 10-bit per component YCbCr 420, two plane
+     - Plane 0: 1 component
+              * Component 0: Y(10)
+       Plane 1: 2 components
+              * Component 0: Cb(10, 2x2 subsampled)
+              * Component 1: Cr(10, 2x2 subsampled)
diff --git a/Documentation/gpu/amdgpu/amdgpu-glossary.rst b/Documentation/gpu/amdgpu/amdgpu-glossary.rst
new file mode 100644
index 0000000000..00a47ebb0b
--- /dev/null
+++ b/Documentation/gpu/amdgpu/amdgpu-glossary.rst
@@ -0,0 +1,123 @@
+===============
+AMDGPU Glossary
+===============
+
+Here you can find some generic acronyms used in the amdgpu driver. Notice that
+we have a dedicated glossary for Display Core at
+'Documentation/gpu/amdgpu/display/dc-glossary.rst'.
+
+.. glossary::
+
+    active_cu_number
+      The number of CUs that are active on the system.  The number of active
+      CUs may be less than SE * SH * CU depending on the board configuration.
+
+    CP
+      Command Processor
+
+    CPLIB
+      Content Protection Library
+
+    CU
+      Compute Unit
+
+    DFS
+      Digital Frequency Synthesizer
+
+    ECP
+      Enhanced Content Protection
+
+    EOP
+      End Of Pipe/Pipeline
+
+    GART
+      Graphics Address Remapping Table.  This is the name we use for the GPUVM
+      page table used by the GPU kernel driver.  It remaps system resources
+      (memory or MMIO space) into the GPU's address space so the GPU can access
+      them.  The name GART harkens back to the days of AGP when the platform
+      provided an MMU that the GPU could use to get a contiguous view of
+      scattered pages for DMA.  The MMU has since moved on to the GPU, but the
+      name stuck.
+
+    GC
+      Graphics and Compute
+
+    GMC
+      Graphic Memory Controller
+
+    GPUVM
+      GPU Virtual Memory.  This is the GPU's MMU.  The GPU supports multiple
+      virtual address spaces that can be in flight at any given time.  These
+      allow the GPU to remap VRAM and system resources into GPU virtual address
+      spaces for use by the GPU kernel driver and applications using the GPU.
+      These provide memory protection for different applications using the GPU.
+
+    GTT
+      Graphics Translation Tables.  This is a memory pool managed through TTM
+      which provides access to system resources (memory or MMIO space) for
+      use by the GPU. These addresses can be mapped into the "GART" GPUVM page
+      table for use by the kernel driver or into per process GPUVM page tables
+      for application usage.
+
+    IH
+      Interrupt Handler
+
+    HQD
+      Hardware Queue Descriptor
+
+    IB
+      Indirect Buffer
+
+    IP
+        Intellectual Property blocks
+
+    KCQ
+      Kernel Compute Queue
+
+    KGQ
+      Kernel Graphics Queue
+
+    KIQ
+      Kernel Interface Queue
+
+    MEC
+      MicroEngine Compute
+
+    MES
+      MicroEngine Scheduler
+
+    MMHUB
+      Multi-Media HUB
+
+    MQD
+      Memory Queue Descriptor
+
+    PPLib
+      PowerPlay Library - PowerPlay is the power management component.
+
+    PSP
+        Platform Security Processor
+
+    RLC
+      RunList Controller
+
+    SDMA
+      System DMA
+
+    SE
+      Shader Engine
+
+    SH
+      SHader array
+
+    SMU
+      System Management Unit
+
+    SS
+      Spread Spectrum
+
+    VCE
+      Video Compression Engine
+
+    VCN
+      Video Codec Next
diff --git a/Documentation/gpu/amdgpu/apu-asic-info-table.csv b/Documentation/gpu/amdgpu/apu-asic-info-table.csv
new file mode 100644
index 0000000000..2e76b427ba
--- /dev/null
+++ b/Documentation/gpu/amdgpu/apu-asic-info-table.csv
@@ -0,0 +1,12 @@
+Product Name, Code Reference, DCN/DCE version, GC version, VCE/UVD/VCN version, SDMA version, MP0 version
+Radeon R* Graphics, CARRIZO/STONEY, DCE 11, 8, VCE 3 / UVD 6, 3, n/a
+Ryzen 3000 series / AMD Ryzen Embedded V1*/R1* with Radeon Vega Gfx, RAVEN/PICASSO, DCN 1.0, 9.1.0, VCN 1.0, 4.1.0, 10.0.0
+Ryzen 4000 series, RENOIR, DCN 2.1, 9.3, VCN 2.2, 4.1.2, 11.0.3
+Ryzen 3000 series / AMD Ryzen Embedded V1*/R1* with Radeon Vega Gfx, RAVEN2, DCN 1.0, 9.2.2, VCN 1.0.1, 4.1.1, 10.0.1
+SteamDeck, VANGOGH, DCN 3.0.1, 10.3.1, VCN 3.1.0, 5.2.1, 11.5.0
+Ryzen 5000 series / Ryzen 7x30 series, GREEN SARDINE / Cezanne / Barcelo / Barcelo-R, DCN 2.1, 9.3, VCN 2.2, 4.1.1, 12.0.1
+Ryzen 6000 series / Ryzen 7x35 series / Ryzen 7x36 series, YELLOW CARP / Rembrandt / Rembrandt-R, 3.1.2, 10.3.3, VCN 3.1.1, 5.2.3, 13.0.3
+Ryzen 7000 series (AM5), Raphael, 3.1.5, 10.3.6, 3.1.2, 5.2.6, 13.0.5
+Ryzen 7x45 series (FL1), / Dragon Range, 3.1.5, 10.3.6, 3.1.2, 5.2.6, 13.0.5
+Ryzen 7x20 series, Mendocino, 3.1.6, 10.3.7, 3.1.1, 5.2.7, 13.0.8
+Ryzen 7x40 series, Phoenix, 3.1.4, 11.0.1 / 11.0.4, 4.0.2, 6.0.1, 13.0.4 / 13.0.11
+\ No newline at end of file
diff --git a/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv b/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv
new file mode 100644
index 0000000000..882d2518f8
--- /dev/null
+++ b/Documentation/gpu/amdgpu/dgpu-asic-info-table.csv
@@ -0,0 +1,26 @@
+Product Name, Code Reference, DCN/DCE version, GC version, VCN version, SDMA version
+AMD Radeon (TM) HD 8500M/ 8600M /M200 /M320 /M330 /M335 Series, HAINAN, --,  6, --, --
+AMD Radeon HD 7800 /7900 /FireGL Series, TAHITI, DCE 6, 6, VCE 1 / UVD 3, --
+AMD Radeon R7 (TM|HD) M265 /M370 /8500M /8600 /8700 /8700M, OLAND, DCE 6, 6, VCE 1 / UVD 3, --
+AMD Radeon (TM) (HD|R7) 7800 /7970 /8800 /8970 /370/ Series, PITCAIRN, DCE 6, 6, VCE 1 / UVD 3, --
+AMD Radeon (TM|R7|R9|HD) E8860 /M360 /7700 /7800 /8800 /9000(M) /W4100 Series, VERDE, DCE 6, 6, VCE 1 / UVD 3, --
+AMD Radeon HD M280X /M380 /7700 /8950 /W5100, BONAIRE, DCE 8, 7, VCE 2 / UVD 4.2, 1
+AMD Radeon (R9|TM) 200 /390 /W8100 /W9100 Series, HAWAII, DCE 8, 7, VCE 2 / UVD 4.2, 1
+AMD Radeon (TM) R(5|7) M315 /M340 /M360, TOPAZ, *, 8, --, 2
+AMD Radeon (TM) R9 200 /380 /W7100 /S7150 /M390 /M395 Series, TONGA, DCE 10, 8, VCE 3 / UVD 5, 3
+AMD Radeon (FirePro) (TM) R9 Fury Series, FIJI, DCE 10, 8, VCE 3 / UVD 6, 3
+Radeon RX 470 /480 /570 /580 /590 Series - AMD Radeon (TM) (Pro WX) 5100 /E9390 /E9560 /E9565 /V7350 /7100 /P30PH, POLARIS10, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3
+Radeon (TM) (RX|Pro WX) E9260 /460 /V5300X /550 /560(X) Series, POLARIS11, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3
+Radeon (RX/Pro) 500 /540(X) /550 /640 /WX2100 /WX3100 /WX200 Series, POLARIS12, DCE 11.2, 8, VCE 3.4 / UVD 6.3, 3
+Radeon (RX|TM) (PRO|WX) Vega /MI25 /V320 /V340L /8200 /9100 /SSG MxGPU, VEGA10, DCE 12, 9.0.1, VCE 4.0.0 / UVD 7.0.0, 4.0.0
+AMD Radeon (Pro) VII /MI50 /MI60, VEGA20, DCE 12, 9.4.0, VCE 4.1.0 / UVD 7.2.0, 4.2.0
+MI100, ARCTURUS, *, 9.4.1, VCN 2.5.0, 4.2.2
+MI200, ALDEBARAN, *, 9.4.2, VCN 2.6.0, 4.4.0
+AMD Radeon (RX|Pro) 5600(M|XT) /5700 (M|XT|XTB) /W5700, NAVI10, DCN 2.0.0, 10.1.10, VCN 2.0.0, 5.0.0
+AMD Radeon (Pro) 5300 /5500XTB/5500(XT|M) /W5500M /W5500, NAVI14, DCN 2.0.0, 10.1.1, VCN 2.0.2, 5.0.2
+AMD Radeon RX 6800(XT) /6900(XT) /W6800, SIENNA_CICHLID, DCN 3.0.0, 10.3.0, VCN 3.0.0, 5.2.0
+AMD Radeon RX 6700 XT / 6800M / 6700M, NAVY_FLOUNDER, DCN 3.0.0, 10.3.2, VCN 3.0.0, 5.2.2
+AMD Radeon RX 6600(XT) /6600M /W6600 /W6600M, DIMGREY_CAVEFISH, DCN 3.0.2, 10.3.4, VCN 3.0.16, 5.2.4
+AMD Radeon RX 6500M /6300M /W6500M /W6300M, BEIGE_GOBY, DCN 3.0.3, 10.3.5, VCN 3.0.33, 5.2.5
+AMD Radeon RX 7900 XT /XTX, , DCN 3.2.0, 11.0.0, VCN 4.0.0, 6.0.0
+AMD Radeon RX 7600M (XT) /7700S /7600S, , DCN 3.2.1, 11.0.2, VCN 4.0.4, 6.0.2
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diff --git a/Documentation/gpu/amdgpu/display/dc-debug.rst b/Documentation/gpu/amdgpu/display/dc-debug.rst
new file mode 100644
index 0000000000..40c55a6189
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/dc-debug.rst
@@ -0,0 +1,77 @@
+========================
+Display Core Debug tools
+========================
+
+DC Visual Confirmation
+======================
+
+Display core provides a feature named visual confirmation, which is a set of
+bars added at the scanout time by the driver to convey some specific
+information. In general, you can enable this debug option by using::
+
+  echo <N> > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm
+
+Where `N` is an integer number for some specific scenarios that the developer
+wants to enable, you will see some of these debug cases in the following
+subsection.
+
+Multiple Planes Debug
+---------------------
+
+If you want to enable or debug multiple planes in a specific user-space
+application, you can leverage a debug feature named visual confirm. For
+enabling it, you will need::
+
+  echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm
+
+You need to reload your GUI to see the visual confirmation. When the plane
+configuration changes or a full update occurs there will be a colored bar at
+the bottom of each hardware plane being drawn on the screen.
+
+* The color indicates the format - For example, red is AR24 and green is NV12
+* The height of the bar indicates the index of the plane
+* Pipe split can be observed if there are two bars with a difference in height
+  covering the same plane
+
+Consider the video playback case in which a video is played in a specific
+plane, and the desktop is drawn in another plane. The video plane should
+feature one or two green bars at the bottom of the video depending on pipe
+split configuration.
+
+* There should **not** be any visual corruption
+* There should **not** be any underflow or screen flashes
+* There should **not** be any black screens
+* There should **not** be any cursor corruption
+* Multiple plane **may** be briefly disabled during window transitions or
+  resizing but should come back after the action has finished
+
+Pipe Split Debug
+----------------
+
+Sometimes we need to debug if DCN is splitting pipes correctly, and visual
+confirmation is also handy for this case. Similar to the MPO case, you can use
+the below command to enable visual confirmation::
+
+  echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm
+
+In this case, if you have a pipe split, you will see one small red bar at the
+bottom of the display covering the entire display width and another bar
+covering the second pipe. In other words, you will see a bit high bar in the
+second pipe.
+
+DTN Debug
+=========
+
+DC (DCN) provides an extensive log that dumps multiple details from our
+hardware configuration. Via debugfs, you can capture those status values by
+using Display Test Next (DTN) log, which can be captured via debugfs by using::
+
+  cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
+
+Since this log is updated accordingly with DCN status, you can also follow the
+change in real-time by using something like::
+
+  sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
+
+When reporting a bug related to DC, consider attaching this log before and
+after you reproduce the bug.
diff --git a/Documentation/gpu/amdgpu/display/dc-glossary.rst b/Documentation/gpu/amdgpu/display/dc-glossary.rst
new file mode 100644
index 0000000000..0b0ffd428d
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/dc-glossary.rst
@@ -0,0 +1,237 @@
+===========
+DC Glossary
+===========
+
+On this page, we try to keep track of acronyms related to the display
+component. If you do not find what you are looking for, look at the
+'Documentation/gpu/amdgpu/amdgpu-glossary.rst'; if you cannot find it anywhere,
+consider asking in the amdgfx and update this page.
+
+.. glossary::
+
+    ABM
+      Adaptive Backlight Modulation
+
+    APU
+      Accelerated Processing Unit
+
+    ASIC
+      Application-Specific Integrated Circuit
+
+    ASSR
+      Alternate Scrambler Seed Reset
+
+    AZ
+      Azalia (HD audio DMA engine)
+
+    BPC
+      Bits Per Colour/Component
+
+    BPP
+      Bits Per Pixel
+
+    Clocks
+      * PCLK: Pixel Clock
+      * SYMCLK: Symbol Clock
+      * SOCCLK: GPU Engine Clock
+      * DISPCLK: Display Clock
+      * DPPCLK: DPP Clock
+      * DCFCLK: Display Controller Fabric Clock
+      * REFCLK: Real Time Reference Clock
+      * PPLL: Pixel PLL
+      * FCLK: Fabric Clock
+      * MCLK: Memory Clock
+
+    CRC
+      Cyclic Redundancy Check
+
+    CRTC
+      Cathode Ray Tube Controller - commonly called "Controller" - Generates
+      raw stream of pixels, clocked at pixel clock
+
+    CVT
+      Coordinated Video Timings
+
+    DAL
+      Display Abstraction layer
+
+    DC (Software)
+      Display Core
+
+    DC (Hardware)
+      Display Controller
+
+    DCC
+      Delta Colour Compression
+
+    DCE
+      Display Controller Engine
+
+    DCHUB
+      Display Controller HUB
+
+    ARB
+      Arbiter
+
+    VTG
+      Vertical Timing Generator
+
+    DCN
+      Display Core Next
+
+    DCCG
+      Display Clock Generator block
+
+    DDC
+      Display Data Channel
+
+    DIO
+      Display IO
+
+    DPP
+      Display Pipes and Planes
+
+    DSC
+      Display Stream Compression (Reduce the amount of bits to represent pixel
+      count while at the same pixel clock)
+
+    dGPU
+      discrete GPU
+
+    DMIF
+      Display Memory Interface
+
+    DML
+      Display Mode Library
+
+    DMCU
+      Display Micro-Controller Unit
+
+    DMCUB
+      Display Micro-Controller Unit, version B
+
+    DPCD
+      DisplayPort Configuration Data
+
+    DPM(S)
+      Display Power Management (Signaling)
+
+    DRR
+      Dynamic Refresh Rate
+
+    DWB
+      Display Writeback
+
+    FB
+      Frame Buffer
+
+    FBC
+      Frame Buffer Compression
+
+    FEC
+      Forward Error Correction
+
+    FRL
+      Fixed Rate Link
+
+    GCO
+      Graphical Controller Object
+
+    GSL
+      Global Swap Lock
+
+    iGPU
+      integrated GPU
+
+    ISR
+      Interrupt Service Request
+
+    ISV
+      Independent Software Vendor
+
+    KMD
+      Kernel Mode Driver
+
+    LB
+      Line Buffer
+
+    LFC
+      Low Framerate Compensation
+
+    LTTPR
+      Link Training Tunable Phy Repeater
+
+    LUT
+      Lookup Table
+
+    MALL
+      Memory Access at Last Level
+
+    MC
+      Memory Controller
+
+    MPC/MPCC
+      Multiple pipes and plane combine
+
+    MPO
+      Multi Plane Overlay
+
+    MST
+      Multi Stream Transport
+
+    NBP State
+      Northbridge Power State
+
+    NBIO
+      North Bridge Input/Output
+
+    ODM
+      Output Data Mapping
+
+    OPM
+      Output Protection Manager
+
+    OPP
+      Output Plane Processor
+
+    OPTC
+      Output Pipe Timing Combiner
+
+    OTG
+      Output Timing Generator
+
+    PCON
+      Power Controller
+
+    PGFSM
+      Power Gate Finite State Machine
+
+    PSR
+      Panel Self Refresh
+
+    SCL
+      Scaler
+
+    SDP
+      Scalable Data Port
+
+    SLS
+      Single Large Surface
+
+    SST
+      Single Stream Transport
+
+    TMDS
+      Transition-Minimized Differential Signaling
+
+    TMZ
+      Trusted Memory Zone
+
+    TTU
+      Time to Underflow
+
+    VRR
+      Variable Refresh Rate
+
+    UVD
+      Unified Video Decoder
diff --git a/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg b/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg
new file mode 100644
index 0000000000..9adecebfe6
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/dc_pipeline_overview.svg
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diff --git a/Documentation/gpu/amdgpu/display/dcn-overview.rst b/Documentation/gpu/amdgpu/display/dcn-overview.rst
new file mode 100644
index 0000000000..9fea650044
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/dcn-overview.rst
@@ -0,0 +1,230 @@
+=======================
+Display Core Next (DCN)
+=======================
+
+To equip our readers with the basic knowledge of how AMD Display Core Next
+(DCN) works, we need to start with an overview of the hardware pipeline. Below
+you can see a picture that provides a DCN overview, keep in mind that this is a
+generic diagram, and we have variations per ASIC.
+
+.. kernel-figure:: dc_pipeline_overview.svg
+
+Based on this diagram, we can pass through each block and briefly describe
+them:
+
+* **Display Controller Hub (DCHUB)**: This is the gateway between the Scalable
+  Data Port (SDP) and DCN. This component has multiple features, such as memory
+  arbitration, rotation, and cursor manipulation.
+
+* **Display Pipe and Plane (DPP)**: This block provides pre-blend pixel
+  processing such as color space conversion, linearization of pixel data, tone
+  mapping, and gamut mapping.
+
+* **Multiple Pipe/Plane Combined (MPC)**: This component performs blending of
+  multiple planes, using global or per-pixel alpha.
+
+* **Output Pixel Processing (OPP)**: Process and format pixels to be sent to
+  the display.
+
+* **Output Pipe Timing Combiner (OPTC)**: It generates time output to combine
+  streams or divide capabilities. CRC values are generated in this block.
+
+* **Display Output (DIO)**: Codify the output to the display connected to our
+  GPU.
+
+* **Display Writeback (DWB)**: It provides the ability to write the output of
+  the display pipe back to memory as video frames.
+
+* **Multi-Media HUB (MMHUBBUB)**: Memory controller interface for DMCUB and DWB
+  (Note that DWB is not hooked yet).
+
+* **DCN Management Unit (DMU)**: It provides registers with access control and
+  interrupts the controller to the SOC host interrupt unit. This block includes
+  the Display Micro-Controller Unit - version B (DMCUB), which is handled via
+  firmware.
+
+* **DCN Clock Generator Block (DCCG)**: It provides the clocks and resets
+  for all of the display controller clock domains.
+
+* **Azalia (AZ)**: Audio engine.
+
+The above diagram is an architecture generalization of DCN, which means that
+every ASIC has variations around this base model. Notice that the display
+pipeline is connected to the Scalable Data Port (SDP) via DCHUB; you can see
+the SDP as the element from our Data Fabric that feeds the display pipe.
+
+Always approach the DCN architecture as something flexible that can be
+configured and reconfigured in multiple ways; in other words, each block can be
+setup or ignored accordingly with userspace demands. For example, if we
+want to drive an 8k@60Hz with a DSC enabled, our DCN may require 4 DPP and 2
+OPP. It is DC's responsibility to drive the best configuration for each
+specific scenario. Orchestrate all of these components together requires a
+sophisticated communication interface which is highlighted in the diagram by
+the edges that connect each block; from the chart, each connection between
+these blocks represents:
+
+1. Pixel data interface (red): Represents the pixel data flow;
+2. Global sync signals (green): It is a set of synchronization signals composed
+   by VStartup, VUpdate, and VReady;
+3. Config interface: Responsible to configure blocks;
+4. Sideband signals: All other signals that do not fit the previous one.
+
+These signals are essential and play an important role in DCN. Nevertheless,
+the Global Sync deserves an extra level of detail described in the next
+section.
+
+All of these components are represented by a data structure named dc_state.
+From DCHUB to MPC, we have a representation called dc_plane; from MPC to OPTC,
+we have dc_stream, and the output (DIO) is handled by dc_link. Keep in mind
+that HUBP accesses a surface using a specific format read from memory, and our
+dc_plane should work to convert all pixels in the plane to something that can
+be sent to the display via dc_stream and dc_link.
+
+Front End and Back End
+----------------------
+
+Display pipeline can be broken down into two components that are usually
+referred as **Front End (FE)** and **Back End (BE)**, where FE consists of:
+
+* DCHUB (Mainly referring to a subcomponent named HUBP)
+* DPP
+* MPC
+
+On the other hand, BE consist of
+
+* OPP
+* OPTC
+* DIO (DP/HDMI stream encoder and link encoder)
+
+OPP and OPTC are two joining blocks between FE and BE. On a side note, this is
+a one-to-one mapping of the link encoder to PHY, but we can configure the DCN
+to choose which link encoder to connect to which PHY. FE's main responsibility
+is to change, blend and compose pixel data, while BE's job is to frame a
+generic pixel stream to a specific display's pixel stream.
+
+Data Flow
+---------
+
+Initially, data is passed in from VRAM through Data Fabric (DF) in native pixel
+formats. Such data format stays through till HUBP in DCHUB, where HUBP unpacks
+different pixel formats and outputs them to DPP in uniform streams through 4
+channels (1 for alpha + 3 for colors).
+
+The Converter and Cursor (CNVC) in DPP would then normalize the data
+representation and convert them to a DCN specific floating-point format (i.e.,
+different from the IEEE floating-point format). In the process, CNVC also
+applies a degamma function to transform the data from non-linear to linear
+space to relax the floating-point calculations following. Data would stay in
+this floating-point format from DPP to OPP.
+
+Starting OPP, because color transformation and blending have been completed
+(i.e alpha can be dropped), and the end sinks do not require the precision and
+dynamic range that floating points provide (i.e. all displays are in integer
+depth format), bit-depth reduction/dithering would kick in. In OPP, we would
+also apply a regamma function to introduce the gamma removed earlier back.
+Eventually, we output data in integer format at DIO.
+
+AMD Hardware Pipeline
+---------------------
+
+When discussing graphics on Linux, the **pipeline** term can sometimes be
+overloaded with multiple meanings, so it is important to define what we mean
+when we say **pipeline**. In the DCN driver, we use the term **hardware
+pipeline** or **pipeline** or just **pipe** as an abstraction to indicate a
+sequence of DCN blocks instantiated to address some specific configuration. DC
+core treats DCN blocks as individual resources, meaning we can build a pipeline
+by taking resources for all individual hardware blocks to compose one pipeline.
+In actuality, we can't connect an arbitrary block from one pipe to a block from
+another pipe; they are routed linearly, except for DSC, which can be
+arbitrarily assigned as needed. We have this pipeline concept for trying to
+optimize bandwidth utilization.
+
+.. kernel-figure:: pipeline_4k_no_split.svg
+
+Additionally, let's take a look at parts of the DTN log (see
+'Documentation/gpu/amdgpu/display/dc-debug.rst' for more information) since
+this log can help us to see part of this pipeline behavior in real-time::
+
+ HUBP:  format  addr_hi  width  height ...
+ [ 0]:      8h      81h   3840    2160
+ [ 1]:      0h       0h      0       0
+ [ 2]:      0h       0h      0       0
+ [ 3]:      0h       0h      0       0
+ [ 4]:      0h       0h      0       0
+ ...
+ MPCC:  OPP  DPP ...
+ [ 0]:   0h   0h ...
+
+The first thing to notice from the diagram and DTN log it is the fact that we
+have different clock domains for each part of the DCN blocks. In this example,
+we have just a single **pipeline** where the data flows from DCHUB to DIO, as
+we intuitively expect. Nonetheless, DCN is flexible, as mentioned before, and
+we can split this single pipe differently, as described in the below diagram:
+
+.. kernel-figure:: pipeline_4k_split.svg
+
+Now, if we inspect the DTN log again we can see some interesting changes::
+
+ HUBP:  format  addr_hi  width  height ...
+ [ 0]:      8h      81h   1920    2160 ...
+ ...
+ [ 4]:      0h       0h      0       0 ...
+ [ 5]:      8h      81h   1920    2160 ...
+ ...
+ MPCC:  OPP  DPP ...
+ [ 0]:   0h   0h ...
+ [ 5]:   0h   5h ...
+
+From the above example, we now split the display pipeline into two vertical
+parts of 1920x2160 (i.e., 3440x2160), and as a result, we could reduce the
+clock frequency in the DPP part. This is not only useful for saving power but
+also to better handle the required throughput. The idea to keep in mind here is
+that the pipe configuration can vary a lot according to the display
+configuration, and it is the DML's responsibility to set up all required
+configuration parameters for multiple scenarios supported by our hardware.
+
+Global Sync
+-----------
+
+Many DCN registers are double buffered, most importantly the surface address.
+This allows us to update DCN hardware atomically for page flips, as well as
+for most other updates that don't require enabling or disabling of new pipes.
+
+(Note: There are many scenarios when DC will decide to reserve extra pipes
+in order to support outputs that need a very high pixel clock, or for
+power saving purposes.)
+
+These atomic register updates are driven by global sync signals in DCN. In
+order to understand how atomic updates interact with DCN hardware, and how DCN
+signals page flip and vblank events it is helpful to understand how global sync
+is programmed.
+
+Global sync consists of three signals, VSTARTUP, VUPDATE, and VREADY. These are
+calculated by the Display Mode Library - DML (drivers/gpu/drm/amd/display/dc/dml)
+based on a large number of parameters and ensure our hardware is able to feed
+the DCN pipeline without underflows or hangs in any given system configuration.
+The global sync signals always happen during VBlank, are independent from the
+VSync signal, and do not overlap each other.
+
+VUPDATE is the only signal that is of interest to the rest of the driver stack
+or userspace clients as it signals the point at which hardware latches to
+atomically programmed (i.e. double buffered) registers. Even though it is
+independent of the VSync signal we use VUPDATE to signal the VSync event as it
+provides the best indication of how atomic commits and hardware interact.
+
+Since DCN hardware is double-buffered the DC driver is able to program the
+hardware at any point during the frame.
+
+The below picture illustrates the global sync signals:
+
+.. kernel-figure:: global_sync_vblank.svg
+
+These signals affect core DCN behavior. Programming them incorrectly will lead
+to a number of negative consequences, most of them quite catastrophic.
+
+The following picture shows how global sync allows for a mailbox style of
+updates, i.e. it allows for multiple re-configurations between VUpdate
+events where only the last configuration programmed before the VUpdate signal
+becomes effective.
+
+.. kernel-figure:: config_example.svg
diff --git a/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg
new file mode 100644
index 0000000000..315ffc5a1a
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+++ b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg
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diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst b/Documentation/gpu/amdgpu/display/display-manager.rst
new file mode 100644
index 0000000000..be2651ecdd
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/display-manager.rst
@@ -0,0 +1,183 @@
+======================
+AMDgpu Display Manager
+======================
+
+.. contents:: Table of Contents
+    :depth: 3
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+   :internal:
+
+Lifecycle
+=========
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :doc: DM Lifecycle
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :functions: dm_hw_init dm_hw_fini
+
+Interrupts
+==========
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :functions: register_hpd_handlers dm_crtc_high_irq dm_pflip_high_irq
+
+Atomic Implementation
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :doc: atomic
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+   :functions: amdgpu_dm_atomic_check amdgpu_dm_atomic_commit_tail
+
+Color Management Properties
+===========================
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+   :internal:
+
+
+DC Color Capabilities between DCN generations
+---------------------------------------------
+
+DRM/KMS framework defines three CRTC color correction properties: degamma,
+color transformation matrix (CTM) and gamma, and two properties for degamma and
+gamma LUT sizes. AMD DC programs some of the color correction features
+pre-blending but DRM/KMS has not per-plane color correction properties.
+
+In general, the DRM CRTC color properties are programmed to DC, as follows:
+CRTC gamma after blending, and CRTC degamma pre-blending. Although CTM is
+programmed after blending, it is mapped to DPP hw blocks (pre-blending). Other
+color caps available in the hw is not currently exposed by DRM interface and
+are bypassed.
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h
+   :doc: color-management-caps
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h
+   :internal:
+
+The color pipeline has undergone major changes between DCN hardware
+generations. What's possible to do before and after blending depends on
+hardware capabilities, as illustrated below by the DCN 2.0 and DCN 3.0 families
+schemas.
+
+**DCN 2.0 family color caps and mapping**
+
+.. kernel-figure:: dcn2_cm_drm_current.svg
+
+**DCN 3.0 family color caps and mapping**
+
+.. kernel-figure:: dcn3_cm_drm_current.svg
+
+Blend Mode Properties
+=====================
+
+Pixel blend mode is a DRM plane composition property of :c:type:`drm_plane` used to
+describes how pixels from a foreground plane (fg) are composited with the
+background plane (bg). Here, we present main concepts of DRM blend mode to help
+to understand how this property is mapped to AMD DC interface. See more about
+this DRM property and the alpha blending equations in :ref:`DRM Plane
+Composition Properties <plane_composition_properties>`.
+
+Basically, a blend mode sets the alpha blending equation for plane
+composition that fits the mode in which the alpha channel affects the state of
+pixel color values and, therefore, the resulted pixel color. For
+example, consider the following elements of the alpha blending equation:
+
+- *fg.rgb*: Each of the RGB component values from the foreground's pixel.
+- *fg.alpha*: Alpha component value from the foreground's pixel.
+- *bg.rgb*: Each of the RGB component values from the background.
+- *plane_alpha*: Plane alpha value set by the **plane "alpha" property**, see
+  more in :ref:`DRM Plane Composition Properties <plane_composition_properties>`.
+
+in the basic alpha blending equation::
+
+   out.rgb = alpha * fg.rgb + (1 - alpha) * bg.rgb
+
+the alpha channel value of each pixel in a plane is ignored and only the plane
+alpha affects the resulted pixel color values.
+
+DRM has three blend mode to define the blend formula in the plane composition:
+
+* **None**: Blend formula that ignores the pixel alpha.
+
+* **Pre-multiplied**: Blend formula that assumes the pixel color values in a
+  plane was already pre-multiplied by its own alpha channel before storage.
+
+* **Coverage**: Blend formula that assumes the pixel color values were not
+  pre-multiplied with the alpha channel values.
+
+and pre-multiplied is the default pixel blend mode, that means, when no blend
+mode property is created or defined, DRM considers the plane's pixels has
+pre-multiplied color values. On IGT GPU tools, the kms_plane_alpha_blend test
+provides a set of subtests to verify plane alpha and blend mode properties.
+
+The DRM blend mode and its elements are then mapped by AMDGPU display manager
+(DM) to program the blending configuration of the Multiple Pipe/Plane Combined
+(MPC), as follows:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+   :doc: mpc-overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+   :functions: mpcc_blnd_cfg
+
+Therefore, the blending configuration for a single MPCC instance on the MPC
+tree is defined by :c:type:`mpcc_blnd_cfg`, where
+:c:type:`pre_multiplied_alpha` is the alpha pre-multiplied mode flag used to
+set :c:type:`MPCC_ALPHA_MULTIPLIED_MODE`. It controls whether alpha is
+multiplied (true/false), being only true for DRM pre-multiplied blend mode.
+:c:type:`mpcc_alpha_blend_mode` defines the alpha blend mode regarding pixel
+alpha and plane alpha values. It sets one of the three modes for
+:c:type:`MPCC_ALPHA_BLND_MODE`, as described below.
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+   :functions: mpcc_alpha_blend_mode
+
+DM then maps the elements of `enum mpcc_alpha_blend_mode` to those in the DRM
+blend formula, as follows:
+
+* *MPC pixel alpha* matches *DRM fg.alpha* as the alpha component value
+  from the plane's pixel
+* *MPC global alpha* matches *DRM plane_alpha* when the pixel alpha should
+  be ignored and, therefore, pixel values are not pre-multiplied
+* *MPC global gain* assumes *MPC global alpha* value when both *DRM
+  fg.alpha* and *DRM plane_alpha* participate in the blend equation
+
+In short, *fg.alpha* is ignored by selecting
+:c:type:`MPCC_ALPHA_BLEND_MODE_GLOBAL_ALPHA`. On the other hand, (plane_alpha *
+fg.alpha) component becomes available by selecting
+:c:type:`MPCC_ALPHA_BLEND_MODE_PER_PIXEL_ALPHA_COMBINED_GLOBAL_GAIN`. And the
+:c:type:`MPCC_ALPHA_MULTIPLIED_MODE` defines if the pixel color values are
+pre-multiplied by alpha or not.
+
+Blend configuration flow
+------------------------
+
+The alpha blending equation is configured from DRM to DC interface by the
+following path:
+
+1. When updating a :c:type:`drm_plane_state <drm_plane_state>`, DM calls
+   :c:type:`amdgpu_dm_plane_fill_blending_from_plane_state()` that maps
+   :c:type:`drm_plane_state <drm_plane_state>` attributes to
+   :c:type:`dc_plane_info <dc_plane_info>` struct to be handled in the
+   OS-agnostic component (DC).
+
+2. On DC interface, :c:type:`struct mpcc_blnd_cfg <mpcc_blnd_cfg>` programs the
+   MPCC blend configuration considering the :c:type:`dc_plane_info
+   <dc_plane_info>` input from DPP.
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new file mode 100644
index 0000000000..48f5dc4fd5
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diff --git a/Documentation/gpu/amdgpu/display/index.rst b/Documentation/gpu/amdgpu/display/index.rst
new file mode 100644
index 0000000000..f8a4f53d70
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/index.rst
@@ -0,0 +1,32 @@
+.. _amdgpu-display-core:
+
+===================================
+drm/amd/display - Display Core (DC)
+===================================
+
+AMD display engine is partially shared with other operating systems; for this
+reason, our Display Core Driver is divided into two pieces:
+
+1. **Display Core (DC)** contains the OS-agnostic components. Things like
+   hardware programming and resource management are handled here.
+2. **Display Manager (DM)** contains the OS-dependent components. Hooks to the
+   amdgpu base driver and DRM are implemented here.
+
+The display pipe is responsible for "scanning out" a rendered frame from the
+GPU memory (also called VRAM, FrameBuffer, etc.) to a display. In other words,
+it would:
+
+1. Read frame information from memory;
+2. Perform required transformation;
+3. Send pixel data to sink devices.
+
+If you want to learn more about our driver details, take a look at the below
+table of content:
+
+.. toctree::
+
+   display-manager.rst
+   dc-debug.rst
+   dcn-overview.rst
+   mpo-overview.rst
+   dc-glossary.rst
diff --git a/Documentation/gpu/amdgpu/display/mpo-cursor.svg b/Documentation/gpu/amdgpu/display/mpo-cursor.svg
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index 0000000000..9d9de76847
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diff --git a/Documentation/gpu/amdgpu/display/mpo-overview.rst b/Documentation/gpu/amdgpu/display/mpo-overview.rst
new file mode 100644
index 0000000000..59a4f54a3a
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/mpo-overview.rst
@@ -0,0 +1,242 @@
+========================
+Multiplane Overlay (MPO)
+========================
+
+.. note:: You will get more from this page if you have already read the
+   'Documentation/gpu/amdgpu/display/dcn-overview.rst'.
+
+
+Multiplane Overlay (MPO) allows for multiple framebuffers to be composited via
+fixed-function hardware in the display controller rather than using graphics or
+compute shaders for composition. This can yield some power savings if it means
+the graphics/compute pipelines can be put into low-power states. In summary,
+MPO can bring the following benefits:
+
+* Decreased GPU and CPU workload - no composition shaders needed, no extra
+  buffer copy needed, GPU can remain idle.
+* Plane independent page flips - No need to be tied to global compositor
+  page-flip present rate, reduced latency, independent timing.
+
+.. note:: Keep in mind that MPO is all about power-saving; if you want to learn
+   more about power-save in the display context, check the link:
+   `Power <https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/power.rst>`__.
+
+Multiplane Overlay is only available using the DRM atomic model. The atomic
+model only uses a single userspace IOCTL for configuring the display hardware
+(modesetting, page-flipping, etc) - drmModeAtomicCommit. To query hardware
+resources and limitations userspace also calls into drmModeGetResources which
+reports back the number of planes, CRTCs, and connectors. There are three types
+of DRM planes that the driver can register and work with:
+
+* ``DRM_PLANE_TYPE_PRIMARY``: Primary planes represent a "main" plane for a
+  CRTC, primary planes are the planes operated upon by CRTC modesetting and
+  flipping operations.
+* ``DRM_PLANE_TYPE_CURSOR``: Cursor planes represent a "cursor" plane for a
+  CRTC. Cursor planes are the planes operated upon by the cursor IOCTLs
+* ``DRM_PLANE_TYPE_OVERLAY``: Overlay planes represent all non-primary,
+  non-cursor planes. Some drivers refer to these types of planes as "sprites"
+  internally.
+
+To illustrate how it works, let's take a look at a device that exposes the
+following planes to userspace:
+
+* 4 Primary planes (1 per CRTC).
+* 4 Cursor planes (1 per CRTC).
+* 1 Overlay plane (shared among CRTCs).
+
+.. note:: Keep in mind that different ASICs might expose other numbers of
+   planes.
+
+For this hardware example, we have 4 pipes (if you don't know what AMD pipe
+means, look at 'Documentation/gpu/amdgpu/display/dcn-overview.rst', section
+"AMD Hardware Pipeline"). Typically most AMD devices operate in a pipe-split
+configuration for optimal single display output (e.g., 2 pipes per plane).
+
+A typical MPO configuration from userspace - 1 primary + 1 overlay on a single
+display - will see 4 pipes in use, 2 per plane.
+
+At least 1 pipe must be used per plane (primary and overlay), so for this
+hypothetical hardware that we are using as an example, we have an absolute
+limit of 4 planes across all CRTCs. Atomic commits will be rejected for display
+configurations using more than 4 planes. Again, it is important to stress that
+every DCN has different restrictions; here, we are just trying to provide the
+concept idea.
+
+Plane Restrictions
+==================
+
+AMDGPU imposes restrictions on the use of DRM planes in the driver.
+
+Atomic commits will be rejected for commits which do not follow these
+restrictions:
+
+* Overlay planes must be in ARGB8888 or XRGB8888 format
+* Planes cannot be placed outside of the CRTC destination rectangle
+* Planes cannot be downscaled more than 1/4x of their original size
+* Planes cannot be upscaled more than 16x of their original size
+
+Not every property is available on every plane:
+
+* Only primary planes have color-space and non-RGB format support
+* Only overlay planes have alpha blending support
+
+Cursor Restrictions
+===================
+
+Before we start to describe some restrictions around cursor and MPO, see the
+below image:
+
+.. kernel-figure:: mpo-cursor.svg
+
+The image on the left side represents how DRM expects the cursor and planes to
+be blended. However, AMD hardware handles cursors differently, as you can see
+on the right side; basically, our cursor cannot be drawn outside its associated
+plane as it is being treated as part of the plane. Another consequence of that
+is that cursors inherit the color and scale from the plane.
+
+As a result of the above behavior, do not use legacy API to set up the cursor
+plane when working with MPO; otherwise, you might encounter unexpected
+behavior.
+
+In short, AMD HW has no dedicated cursor planes. A cursor is attached to
+another plane and therefore inherits any scaling or color processing from its
+parent plane.
+
+Use Cases
+=========
+
+Picture-in-Picture (PIP) playback - Underlay strategy
+-----------------------------------------------------
+
+Video playback should be done using the "primary plane as underlay" MPO
+strategy. This is a 2 planes configuration:
+
+* 1 YUV DRM Primary Plane (e.g. NV12 Video)
+* 1 RGBA DRM Overlay Plane (e.g. ARGB8888 desktop). The compositor should
+  prepare the framebuffers for the planes as follows:
+  - The overlay plane contains general desktop UI, video player controls, and video subtitles
+  - Primary plane contains one or more videos
+
+.. note:: Keep in mind that we could extend this configuration to more planes,
+   but that is currently not supported by our driver yet (maybe if we have a
+   userspace request in the future, we can change that).
+
+See below a single-video example:
+
+.. kernel-figure:: single-display-mpo.svg
+
+.. note:: We could extend this behavior to more planes, but that is currently
+   not supported by our driver.
+
+The video buffer should be used directly for the primary plane. The video can
+be scaled and positioned for the desktop using the properties: CRTC_X, CRTC_Y,
+CRTC_W, and CRTC_H. The primary plane should also have the color encoding and
+color range properties set based on the source content:
+
+* ``COLOR_RANGE``, ``COLOR_ENCODING``
+
+The overlay plane should be the native size of the CRTC. The compositor must
+draw a transparent cutout for where the video should be placed on the desktop
+(i.e., set the alpha to zero). The primary plane video will be visible through
+the underlay. The overlay plane's buffer may remain static while the primary
+plane's framebuffer is used for standard double-buffered playback.
+
+The compositor should create a YUV buffer matching the native size of the CRTC.
+Each video buffer should be composited onto this YUV buffer for direct YUV
+scanout. The primary plane should have the color encoding and color range
+properties set based on the source content: ``COLOR_RANGE``,
+``COLOR_ENCODING``. However, be mindful that the source color space and
+encoding match for each video since it affect the entire plane.
+
+The overlay plane should be the native size of the CRTC. The compositor must
+draw a transparent cutout for where each video should be placed on the desktop
+(i.e., set the alpha to zero). The primary plane videos will be visible through
+the underlay. The overlay plane's buffer may remain static while compositing
+operations for video playback will be done on the video buffer.
+
+This kernel interface is validated using IGT GPU Tools. The following tests can
+be run to validate positioning, blending, scaling under a variety of sequences
+and interactions with operations such as DPMS and S3:
+
+- ``kms_plane@plane-panning-bottom-right-pipe-*-planes``
+- ``kms_plane@plane-panning-bottom-right-suspend-pipe-*-``
+- ``kms_plane@plane-panning-top-left-pipe-*-``
+- ``kms_plane@plane-position-covered-pipe-*-``
+- ``kms_plane@plane-position-hole-dpms-pipe-*-``
+- ``kms_plane@plane-position-hole-pipe-*-``
+- ``kms_plane_multiple@atomic-pipe-*-tiling-``
+- ``kms_plane_scaling@pipe-*-plane-scaling``
+- ``kms_plane_alpha_blend@pipe-*-alpha-basic``
+- ``kms_plane_alpha_blend@pipe-*-alpha-transparant-fb``
+- ``kms_plane_alpha_blend@pipe-*-alpha-opaque-fb``
+- ``kms_plane_alpha_blend@pipe-*-constant-alpha-min``
+- ``kms_plane_alpha_blend@pipe-*-constant-alpha-mid``
+- ``kms_plane_alpha_blend@pipe-*-constant-alpha-max``
+
+Multiple Display MPO
+--------------------
+
+AMDGPU supports display MPO when using multiple displays; however, this feature
+behavior heavily relies on the compositor implementation. Keep in mind that
+userspace can define different policies. For example, some OSes can use MPO to
+protect the plane that handles the video playback; notice that we don't have
+many limitations for a single display. Nonetheless, this manipulation can have
+many more restrictions for a multi-display scenario. The below example shows a
+video playback in the middle of two displays, and it is up to the compositor to
+define a policy on how to handle it:
+
+.. kernel-figure:: multi-display-hdcp-mpo.svg
+
+Let's discuss some of the hardware limitations we have when dealing with
+multi-display with MPO.
+
+Limitations
+~~~~~~~~~~~
+
+For simplicity's sake, for discussing the hardware limitation, this
+documentation supposes an example where we have two displays and video playback
+that will be moved around different displays.
+
+* **Hardware limitations**
+
+From the DCN overview page, each display requires at least one pipe and each
+MPO plane needs another pipe. As a result, when the video is in the middle of
+the two displays, we need to use 2 pipes. See the example below where we avoid
+pipe split:
+
+- 1 display (1 pipe) + MPO (1 pipe), we will use two pipes
+- 2 displays (2 pipes) + MPO (1-2 pipes); we will use 4 pipes. MPO in the
+  middle of both displays needs 2 pipes.
+- 3 Displays (3 pipes) + MPO (1-2 pipes), we need 5 pipes.
+
+If we use MPO with multiple displays, the userspace has to decide to enable
+multiple MPO by the price of limiting the number of external displays supported
+or disable it in favor of multiple displays; it is a policy decision. For
+example:
+
+* When ASIC has 3 pipes, AMD hardware can NOT support 2 displays with MPO
+* When ASIC has 4 pipes, AMD hardware can NOT support 3 displays with MPO
+
+Let's briefly explore how userspace can handle these two display configurations
+on an ASIC that only supports three pipes. We can have:
+
+.. kernel-figure:: multi-display-hdcp-mpo-less-pipe-ex.svg
+
+- Total pipes are 3
+- User lights up 2 displays (2 out of 3 pipes are used)
+- User launches video (1 pipe used for MPO)
+- Now, if the user moves the video in the middle of 2 displays, one part of the
+  video won't be MPO since we have used 3/3 pipes.
+
+* **Scaling limitation**
+
+MPO cannot handle scaling less than 0.25 and more than x16. For example:
+
+If 4k video (3840x2160) is playing in windowed mode, the physical size of the
+window cannot be smaller than (960x540).
+
+.. note:: These scaling limitations might vary from ASIC to ASIC.
+
+* **Size Limitation**
+
+The minimum MPO size is 12px.
diff --git a/Documentation/gpu/amdgpu/display/multi-display-hdcp-mpo-less-pipe-ex.svg b/Documentation/gpu/amdgpu/display/multi-display-hdcp-mpo-less-pipe-ex.svg
new file mode 100644
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index 0000000000..5fa289d99f
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diff --git a/Documentation/gpu/amdgpu/driver-core.rst b/Documentation/gpu/amdgpu/driver-core.rst
new file mode 100644
index 0000000000..467e6843ae
--- /dev/null
+++ b/Documentation/gpu/amdgpu/driver-core.rst
@@ -0,0 +1,182 @@
+============================
+ Core Driver Infrastructure
+============================
+
+GPU Hardware Structure
+======================
+
+Each ASIC is a collection of hardware blocks.  We refer to them as
+"IPs" (Intellectual Property blocks).  Each IP encapsulates certain
+functionality. IPs are versioned and can also be mixed and matched.
+E.g., you might have two different ASICs that both have System DMA (SDMA) 5.x IPs.
+The driver is arranged by IPs.  There are driver components to handle
+the initialization and operation of each IP.  There are also a bunch
+of smaller IPs that don't really need much if any driver interaction.
+Those end up getting lumped into the common stuff in the soc files.
+The soc files (e.g., vi.c, soc15.c nv.c) contain code for aspects of
+the SoC itself rather than specific IPs.  E.g., things like GPU resets
+and register access functions are SoC dependent.
+
+An APU contains more than just CPU and GPU, it also contains all of
+the platform stuff (audio, usb, gpio, etc.).  Also, a lot of
+components are shared between the CPU, platform, and the GPU (e.g.,
+SMU, PSP, etc.).  Specific components (CPU, GPU, etc.) usually have
+their interface to interact with those common components.  For things
+like S0i3 there is a ton of coordination required across all the
+components, but that is probably a bit beyond the scope of this
+section.
+
+With respect to the GPU, we have the following major IPs:
+
+GMC (Graphics Memory Controller)
+    This was a dedicated IP on older pre-vega chips, but has since
+    become somewhat decentralized on vega and newer chips.  They now
+    have dedicated memory hubs for specific IPs or groups of IPs.  We
+    still treat it as a single component in the driver however since
+    the programming model is still pretty similar.  This is how the
+    different IPs on the GPU get the memory (VRAM or system memory).
+    It also provides the support for per process GPU virtual address
+    spaces.
+
+IH (Interrupt Handler)
+    This is the interrupt controller on the GPU.  All of the IPs feed
+    their interrupts into this IP and it aggregates them into a set of
+    ring buffers that the driver can parse to handle interrupts from
+    different IPs.
+
+PSP (Platform Security Processor)
+    This handles security policy for the SoC and executes trusted
+    applications, and validates and loads firmwares for other blocks.
+
+SMU (System Management Unit)
+    This is the power management microcontroller.  It manages the entire
+    SoC.  The driver interacts with it to control power management
+    features like clocks, voltages, power rails, etc.
+
+DCN (Display Controller Next)
+    This is the display controller.  It handles the display hardware.
+    It is described in more details in :ref:`Display Core <amdgpu-display-core>`.
+
+SDMA (System DMA)
+    This is a multi-purpose DMA engine.  The kernel driver uses it for
+    various things including paging and GPU page table updates.  It's also
+    exposed to userspace for use by user mode drivers (OpenGL, Vulkan,
+    etc.)
+
+GC (Graphics and Compute)
+    This is the graphics and compute engine, i.e., the block that
+    encompasses the 3D pipeline and and shader blocks.  This is by far the
+    largest block on the GPU.  The 3D pipeline has tons of sub-blocks.  In
+    addition to that, it also contains the CP microcontrollers (ME, PFP,
+    CE, MEC) and the RLC microcontroller.  It's exposed to userspace for
+    user mode drivers (OpenGL, Vulkan, OpenCL, etc.)
+
+VCN (Video Core Next)
+    This is the multi-media engine.  It handles video and image encode and
+    decode.  It's exposed to userspace for user mode drivers (VA-API,
+    OpenMAX, etc.)
+
+Graphics and Compute Microcontrollers
+-------------------------------------
+
+CP (Command Processor)
+    The name for the hardware block that encompasses the front end of the
+    GFX/Compute pipeline.  Consists mainly of a bunch of microcontrollers
+    (PFP, ME, CE, MEC).  The firmware that runs on these microcontrollers
+    provides the driver interface to interact with the GFX/Compute engine.
+
+    MEC (MicroEngine Compute)
+        This is the microcontroller that controls the compute queues on the
+        GFX/compute engine.
+
+    MES (MicroEngine Scheduler)
+        This is a new engine for managing queues.  This is currently unused.
+
+RLC (RunList Controller)
+    This is another microcontroller in the GFX/Compute engine.  It handles
+    power management related functionality within the GFX/Compute engine.
+    The name is a vestige of old hardware where it was originally added
+    and doesn't really have much relation to what the engine does now.
+
+Driver Structure
+================
+
+In general, the driver has a list of all of the IPs on a particular
+SoC and for things like init/fini/suspend/resume, more or less just
+walks the list and handles each IP.
+
+Some useful constructs:
+
+KIQ (Kernel Interface Queue)
+    This is a control queue used by the kernel driver to manage other gfx
+    and compute queues on the GFX/compute engine.  You can use it to
+    map/unmap additional queues, etc.
+
+IB (Indirect Buffer)
+    A command buffer for a particular engine.  Rather than writing
+    commands directly to the queue, you can write the commands into a
+    piece of memory and then put a pointer to the memory into the queue.
+    The hardware will then follow the pointer and execute the commands in
+    the memory, then returning to the rest of the commands in the ring.
+
+.. _amdgpu_memory_domains:
+
+Memory Domains
+==============
+
+.. kernel-doc:: include/uapi/drm/amdgpu_drm.h
+   :doc: memory domains
+
+Buffer Objects
+==============
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+   :doc: amdgpu_object
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+   :internal:
+
+PRIME Buffer Sharing
+====================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+   :doc: PRIME Buffer Sharing
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+   :internal:
+
+MMU Notifier
+============
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
+   :doc: MMU Notifier
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
+   :internal:
+
+AMDGPU Virtual Memory
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+   :doc: GPUVM
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+   :internal:
+
+Interrupt Handling
+==================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+   :doc: Interrupt Handling
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+   :internal:
+
+IP Blocks
+=========
+
+.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h
+   :doc: IP Blocks
+
+.. kernel-doc:: drivers/gpu/drm/amd/include/amd_shared.h
+   :identifiers: amd_ip_block_type amd_ip_funcs
diff --git a/Documentation/gpu/amdgpu/driver-misc.rst b/Documentation/gpu/amdgpu/driver-misc.rst
new file mode 100644
index 0000000000..4321c38fef
--- /dev/null
+++ b/Documentation/gpu/amdgpu/driver-misc.rst
@@ -0,0 +1,129 @@
+================================
+ Misc AMDGPU driver information
+================================
+
+GPU Product Information
+=======================
+
+Information about the GPU can be obtained on certain cards
+via sysfs
+
+product_name
+------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
+   :doc: product_name
+
+product_number
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
+   :doc: product_number
+
+serial_number
+-------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
+   :doc: serial_number
+
+unique_id
+---------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: unique_id
+
+Accelerated Processing Units (APU) Info
+---------------------------------------
+
+.. csv-table::
+   :header-rows: 1
+   :widths: 3, 2, 2, 1, 1, 1, 1
+   :file: ./apu-asic-info-table.csv
+
+Discrete GPU Info
+-----------------
+
+.. csv-table::
+   :header-rows: 1
+   :widths: 3, 2, 2, 1, 1, 1
+   :file: ./dgpu-asic-info-table.csv
+
+
+GPU Memory Usage Information
+============================
+
+Various memory accounting can be accessed via sysfs
+
+mem_info_vram_total
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+   :doc: mem_info_vram_total
+
+mem_info_vram_used
+------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+   :doc: mem_info_vram_used
+
+mem_info_vis_vram_total
+-----------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+   :doc: mem_info_vis_vram_total
+
+mem_info_vis_vram_used
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+   :doc: mem_info_vis_vram_used
+
+mem_info_gtt_total
+------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+   :doc: mem_info_gtt_total
+
+mem_info_gtt_used
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+   :doc: mem_info_gtt_used
+
+PCIe Accounting Information
+===========================
+
+pcie_bw
+-------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: pcie_bw
+
+pcie_replay_count
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+   :doc: pcie_replay_count
+
+GPU SmartShift Information
+==========================
+
+GPU SmartShift information via sysfs
+
+smartshift_apu_power
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: smartshift_apu_power
+
+smartshift_dgpu_power
+---------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: smartshift_dgpu_power
+
+smartshift_bias
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: smartshift_bias
diff --git a/Documentation/gpu/amdgpu/flashing.rst b/Documentation/gpu/amdgpu/flashing.rst
new file mode 100644
index 0000000000..bd745c42a5
--- /dev/null
+++ b/Documentation/gpu/amdgpu/flashing.rst
@@ -0,0 +1,33 @@
+=======================
+ dGPU firmware flashing
+=======================
+
+IFWI
+----
+Flashing the dGPU integrated firmware image (IFWI) is supported by GPUs that
+use the PSP to orchestrate the update (Navi3x or newer GPUs).
+For supported GPUs, `amdgpu` will export a series of sysfs files that can be
+used for the flash process.
+
+The IFWI flash process is:
+
+1. Ensure the IFWI image is intended for the dGPU on the system.
+2. "Write" the IFWI image to the sysfs file `psp_vbflash`. This will stage the IFWI in memory.
+3. "Read" from the `psp_vbflash` sysfs file to initiate the flash process.
+4. Poll the `psp_vbflash_status` sysfs file to determine when the flash process completes.
+
+USB-C PD F/W
+------------
+On GPUs that support flashing an updated USB-C PD firmware image, the process
+is done using the `usbc_pd_fw` sysfs file.
+
+* Reading the file will provide the current firmware version.
+* Writing the name of a firmware payload stored in `/lib/firmware/amdgpu` to the sysfs file will initiate the flash process.
+
+The firmware payload stored in `/lib/firmware/amdgpu` can be named any name
+as long as it doesn't conflict with other existing binaries that are used by
+`amdgpu`.
+
+sysfs files
+-----------
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
diff --git a/Documentation/gpu/amdgpu/index.rst b/Documentation/gpu/amdgpu/index.rst
new file mode 100644
index 0000000000..912e699fd3
--- /dev/null
+++ b/Documentation/gpu/amdgpu/index.rst
@@ -0,0 +1,18 @@
+==========================
+ drm/amdgpu AMDgpu driver
+==========================
+
+The drm/amdgpu driver supports all AMD Radeon GPUs based on the Graphics Core
+Next (GCN), Radeon DNA (RDNA), and Compute DNA (CDNA) architectures.
+
+.. toctree::
+
+   module-parameters
+   driver-core
+   display/index
+   flashing
+   xgmi
+   ras
+   thermal
+   driver-misc
+   amdgpu-glossary
diff --git a/Documentation/gpu/amdgpu/module-parameters.rst b/Documentation/gpu/amdgpu/module-parameters.rst
new file mode 100644
index 0000000000..ea538c8dda
--- /dev/null
+++ b/Documentation/gpu/amdgpu/module-parameters.rst
@@ -0,0 +1,7 @@
+===================
+ Module Parameters
+===================
+
+The amdgpu driver supports the following module parameters:
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
diff --git a/Documentation/gpu/amdgpu/ras.rst b/Documentation/gpu/amdgpu/ras.rst
new file mode 100644
index 0000000000..047f76e395
--- /dev/null
+++ b/Documentation/gpu/amdgpu/ras.rst
@@ -0,0 +1,62 @@
+====================
+ AMDGPU RAS Support
+====================
+
+The AMDGPU RAS interfaces are exposed via sysfs (for informational queries) and
+debugfs (for error injection).
+
+RAS debugfs/sysfs Control and Error Injection Interfaces
+========================================================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+   :doc: AMDGPU RAS debugfs control interface
+
+RAS Reboot Behavior for Unrecoverable Errors
+============================================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+   :doc: AMDGPU RAS Reboot Behavior for Unrecoverable Errors
+
+RAS Error Count sysfs Interface
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+   :doc: AMDGPU RAS sysfs Error Count Interface
+
+RAS EEPROM debugfs Interface
+============================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+   :doc: AMDGPU RAS debugfs EEPROM table reset interface
+
+RAS VRAM Bad Pages sysfs Interface
+==================================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+   :doc: AMDGPU RAS sysfs gpu_vram_bad_pages Interface
+
+Sample Code
+===========
+Sample code for testing error injection can be found here:
+https://cgit.freedesktop.org/mesa/drm/tree/tests/amdgpu/ras_tests.c
+
+This is part of the libdrm amdgpu unit tests which cover several areas of the GPU.
+There are four sets of tests:
+
+RAS Basic Test
+
+The test verifies the RAS feature enabled status and makes sure the necessary sysfs and debugfs files
+are present.
+
+RAS Query Test
+
+This test checks the RAS availability and enablement status for each supported IP block as well as
+the error counts.
+
+RAS Inject Test
+
+This test injects errors for each IP.
+
+RAS Disable Test
+
+This test tests disabling of RAS features for each IP block.
diff --git a/Documentation/gpu/amdgpu/thermal.rst b/Documentation/gpu/amdgpu/thermal.rst
new file mode 100644
index 0000000000..5e27e4eb39
--- /dev/null
+++ b/Documentation/gpu/amdgpu/thermal.rst
@@ -0,0 +1,122 @@
+===========================================
+ GPU Power/Thermal Controls and Monitoring
+===========================================
+
+HWMON Interfaces
+================
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: hwmon
+
+GPU sysfs Power State Interfaces
+================================
+
+GPU power controls are exposed via sysfs files.
+
+power_dpm_state
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: power_dpm_state
+
+power_dpm_force_performance_level
+---------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: power_dpm_force_performance_level
+
+pp_table
+--------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: pp_table
+
+pp_od_clk_voltage
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: pp_od_clk_voltage
+
+pp_dpm_*
+--------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk pp_dpm_pcie
+
+pp_power_profile_mode
+---------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: pp_power_profile_mode
+
+\*_busy_percent
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: gpu_busy_percent
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: mem_busy_percent
+
+gpu_metrics
+-----------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: gpu_metrics
+
+GFXOFF
+======
+
+GFXOFF is a feature found in most recent GPUs that saves power at runtime. The
+card's RLC (RunList Controller) firmware powers off the gfx engine
+dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by
+default on supported GPUs.
+
+Userspace can interact with GFXOFF through a debugfs interface (all values in
+`uint32_t`, unless otherwise noted):
+
+``amdgpu_gfxoff``
+-----------------
+
+Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled::
+
+  $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff
+  01
+
+- Write 0 to disable it, and 1 to enable it.
+- Read 0 means it's disabled, 1 it's enabled.
+
+If it's enabled, that means that the GPU is free to enter into GFXOFF mode as
+needed. Disabled means that it will never enter GFXOFF mode.
+
+``amdgpu_gfxoff_status``
+------------------------
+
+Read it to check current GFXOFF's status of a GPU::
+
+  $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status
+  02
+
+- 0: GPU is in GFXOFF state, the gfx engine is powered down.
+- 1: Transition out of GFXOFF state
+- 2: Not in GFXOFF state
+- 3: Transition into GFXOFF state
+
+If GFXOFF is enabled, the value will be transitioning around [0, 3], always
+getting into 0 when possible. When it's disabled, it's always at 2. Returns
+``-EINVAL`` if it's not supported.
+
+``amdgpu_gfxoff_count``
+-----------------------
+
+Read it to get the total GFXOFF entry count at the time of query since system
+power-up. The value is an `uint64_t` type, however, due to firmware limitations,
+it can currently overflow as an `uint32_t`. *Only supported in vangogh*
+
+``amdgpu_gfxoff_residency``
+---------------------------
+
+Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to
+get average GFXOFF residency % multiplied by 100 during the last logging
+interval. E.g. a value of 7854 means 78.54% of the time in the last logging
+interval the GPU was in GFXOFF mode. *Only supported in vangogh*
diff --git a/Documentation/gpu/amdgpu/xgmi.rst b/Documentation/gpu/amdgpu/xgmi.rst
new file mode 100644
index 0000000000..23f2856f45
--- /dev/null
+++ b/Documentation/gpu/amdgpu/xgmi.rst
@@ -0,0 +1,5 @@
+=====================
+ AMDGPU XGMI Support
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
diff --git a/Documentation/gpu/automated_testing.rst b/Documentation/gpu/automated_testing.rst
new file mode 100644
index 0000000000..469b6fb65c
--- /dev/null
+++ b/Documentation/gpu/automated_testing.rst
@@ -0,0 +1,144 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+=========================================
+Automated testing of the DRM subsystem
+=========================================
+
+Introduction
+============
+
+Making sure that changes to the core or drivers don't introduce regressions can
+be very time-consuming when lots of different hardware configurations need to
+be tested. Moreover, it isn't practical for each person interested in this
+testing to have to acquire and maintain what can be a considerable amount of
+hardware.
+
+Also, it is desirable for developers to check for regressions in their code by
+themselves, instead of relying on the maintainers to find them and then
+reporting back.
+
+There are facilities in gitlab.freedesktop.org to automatically test Mesa that
+can be used as well for testing the DRM subsystem. This document explains how
+people interested in testing it can use this shared infrastructure to save
+quite some time and effort.
+
+
+Relevant files
+==============
+
+drivers/gpu/drm/ci/gitlab-ci.yml
+--------------------------------
+
+This is the root configuration file for GitLab CI. Among other less interesting
+bits, it specifies the specific version of the scripts to be used. There are
+some variables that can be modified to change the behavior of the pipeline:
+
+DRM_CI_PROJECT_PATH
+    Repository that contains the Mesa software infrastructure for CI
+
+DRM_CI_COMMIT_SHA
+    A particular revision to use from that repository
+
+UPSTREAM_REPO
+    URL to git repository containing the target branch
+
+TARGET_BRANCH
+    Branch to which this branch is to be merged into
+
+IGT_VERSION
+    Revision of igt-gpu-tools being used, from
+    https://gitlab.freedesktop.org/drm/igt-gpu-tools
+
+drivers/gpu/drm/ci/testlist.txt
+-------------------------------
+
+IGT tests to be run on all drivers (unless mentioned in a driver's \*-skips.txt
+file, see below).
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-fails.txt
+----------------------------------------------------------
+
+Lists the known failures for a given driver on a specific hardware revision.
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-flakes.txt
+-----------------------------------------------------------
+
+Lists the tests that for a given driver on a specific hardware revision are
+known to behave unreliably. These tests won't cause a job to fail regardless of
+the result. They will still be run.
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-skips.txt
+-----------------------------------------------------------
+
+Lists the tests that won't be run for a given driver on a specific hardware
+revision. These are usually tests that interfere with the running of the test
+list due to hanging the machine, causing OOM, taking too long, etc.
+
+
+How to enable automated testing on your tree
+============================================
+
+1. Create a Linux tree in https://gitlab.freedesktop.org/ if you don't have one
+yet
+
+2. In your kernel repo's configuration (eg.
+https://gitlab.freedesktop.org/janedoe/linux/-/settings/ci_cd), change the
+CI/CD configuration file from .gitlab-ci.yml to
+drivers/gpu/drm/ci/gitlab-ci.yml.
+
+3. Next time you push to this repository, you will see a CI pipeline being
+created (eg. https://gitlab.freedesktop.org/janedoe/linux/-/pipelines)
+
+4. The various jobs will be run and when the pipeline is finished, all jobs
+should be green unless a regression has been found.
+
+
+How to update test expectations
+===============================
+
+If your changes to the code fix any tests, you will have to remove one or more
+lines from one or more of the files in
+drivers/gpu/drm/ci/${DRIVER_NAME}_*_fails.txt, for each of the test platforms
+affected by the change.
+
+
+How to expand coverage
+======================
+
+If your code changes make it possible to run more tests (by solving reliability
+issues, for example), you can remove tests from the flakes and/or skips lists,
+and then the expected results if there are any known failures.
+
+If there is a need for updating the version of IGT being used (maybe you have
+added more tests to it), update the IGT_VERSION variable at the top of the
+gitlab-ci.yml file.
+
+
+How to test your changes to the scripts
+=======================================
+
+For testing changes to the scripts in the drm-ci repo, change the
+DRM_CI_PROJECT_PATH and DRM_CI_COMMIT_SHA variables in
+drivers/gpu/drm/ci/gitlab-ci.yml to match your fork of the project (eg.
+janedoe/drm-ci). This fork needs to be in https://gitlab.freedesktop.org/.
+
+
+How to incorporate external fixes in your testing
+=================================================
+
+Often, regressions in other trees will prevent testing changes local to the
+tree under test. These fixes will be automatically merged in during the build
+jobs from a branch in the target tree that is named as
+${TARGET_BRANCH}-external-fixes.
+
+If the pipeline is not in a merge request and a branch with the same name
+exists in the local tree, commits from that branch will be merged in as well.
+
+
+How to deal with automated testing labs that may be down
+========================================================
+
+If a hardware farm is down and thus causing pipelines to fail that would
+otherwise pass, one can disable all jobs that would be submitted to that farm
+by editing the file at
+https://gitlab.freedesktop.org/gfx-ci/lab-status/-/blob/main/lab-status.yml.
diff --git a/Documentation/gpu/backlight.rst b/Documentation/gpu/backlight.rst
new file mode 100644
index 0000000000..9ebfc9d0ac
--- /dev/null
+++ b/Documentation/gpu/backlight.rst
@@ -0,0 +1,12 @@
+=================
+Backlight support
+=================
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :doc: overview
+
+.. kernel-doc:: include/linux/backlight.h
+   :internal:
+
+.. kernel-doc:: drivers/video/backlight/backlight.c
+   :export:
diff --git a/Documentation/gpu/bridge/dw-hdmi.rst b/Documentation/gpu/bridge/dw-hdmi.rst
new file mode 100644
index 0000000000..486faadf00
--- /dev/null
+++ b/Documentation/gpu/bridge/dw-hdmi.rst
@@ -0,0 +1,15 @@
+=======================================================
+ drm/bridge/dw-hdmi Synopsys DesignWare HDMI Controller
+=======================================================
+
+Synopsys DesignWare HDMI Controller
+===================================
+
+This section covers everything related to the Synopsys DesignWare HDMI
+Controller implemented as a DRM bridge.
+
+Supported Input Formats and Encodings
+-------------------------------------
+
+.. kernel-doc:: include/drm/bridge/dw_hdmi.h
+   :doc: Supported input formats and encodings
diff --git a/Documentation/gpu/dp-mst/topology-figure-1.dot b/Documentation/gpu/dp-mst/topology-figure-1.dot
new file mode 100644
index 0000000000..157e17c7e0
--- /dev/null
+++ b/Documentation/gpu/dp-mst/topology-figure-1.dot
@@ -0,0 +1,52 @@
+digraph T {
+    /* Make sure our payloads are always drawn below the driver node */
+    subgraph cluster_driver {
+        fillcolor = grey;
+        style = filled;
+        driver -> {payload1, payload2} [dir=none];
+    }
+
+    /* Driver malloc references */
+    edge [style=dashed];
+    driver -> port1;
+    driver -> port2;
+    driver -> port3:e;
+    driver -> port4;
+
+    payload1:s -> port1:e;
+    payload2:s -> port3:e;
+    edge [style=""];
+
+    subgraph cluster_topology {
+        label="Topology Manager";
+        labelloc=bottom;
+
+        /* Topology references */
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        port2 -> mstb3 -> {port3, port4};
+        port3 -> mstb4;
+
+        /* Malloc references */
+        edge [style=dashed;dir=back];
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        port2 -> mstb3 -> {port3, port4};
+        port3 -> mstb4;
+    }
+
+    driver [label="DRM driver";style=filled;shape=box;fillcolor=lightblue];
+
+    payload1 [label="Payload #1";style=filled;shape=box;fillcolor=lightblue];
+    payload2 [label="Payload #2";style=filled;shape=box;fillcolor=lightblue];
+
+    mstb1 [label="MSTB #1";style=filled;fillcolor=palegreen;shape=oval];
+    mstb2 [label="MSTB #2";style=filled;fillcolor=palegreen;shape=oval];
+    mstb3 [label="MSTB #3";style=filled;fillcolor=palegreen;shape=oval];
+    mstb4 [label="MSTB #4";style=filled;fillcolor=palegreen;shape=oval];
+
+    port1 [label="Port #1";shape=oval];
+    port2 [label="Port #2";shape=oval];
+    port3 [label="Port #3";shape=oval];
+    port4 [label="Port #4";shape=oval];
+}
diff --git a/Documentation/gpu/dp-mst/topology-figure-2.dot b/Documentation/gpu/dp-mst/topology-figure-2.dot
new file mode 100644
index 0000000000..4243dd1737
--- /dev/null
+++ b/Documentation/gpu/dp-mst/topology-figure-2.dot
@@ -0,0 +1,56 @@
+digraph T {
+    /* Make sure our payloads are always drawn below the driver node */
+    subgraph cluster_driver {
+        fillcolor = grey;
+        style = filled;
+        driver -> {payload1, payload2} [dir=none];
+    }
+
+    /* Driver malloc references */
+    edge [style=dashed];
+    driver -> port1;
+    driver -> port2;
+    driver -> port3:e;
+    driver -> port4 [color=red];
+
+    payload1:s -> port1:e;
+    payload2:s -> port3:e;
+    edge [style=""];
+
+    subgraph cluster_topology {
+        label="Topology Manager";
+        labelloc=bottom;
+
+        /* Topology references */
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        edge [color=red];
+        port2 -> mstb3 -> {port3, port4};
+        port3 -> mstb4;
+        edge [color=""];
+
+        /* Malloc references */
+        edge [style=dashed;dir=back];
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        port2 -> mstb3 -> port3;
+        edge [color=red];
+        mstb3 -> port4;
+        port3 -> mstb4;
+    }
+
+    mstb1 [label="MSTB #1";style=filled;fillcolor=palegreen];
+    mstb2 [label="MSTB #2";style=filled;fillcolor=palegreen];
+    mstb3 [label="MSTB #3";style=filled;fillcolor=palegreen];
+    mstb4 [label="MSTB #4";style=filled;fillcolor=grey];
+
+    port1 [label="Port #1"];
+    port2 [label="Port #2"];
+    port3 [label="Port #3"];
+    port4 [label="Port #4";style=filled;fillcolor=grey];
+
+    driver [label="DRM driver";style=filled;shape=box;fillcolor=lightblue];
+
+    payload1 [label="Payload #1";style=filled;shape=box;fillcolor=lightblue];
+    payload2 [label="Payload #2";style=filled;shape=box;fillcolor=lightblue];
+}
diff --git a/Documentation/gpu/dp-mst/topology-figure-3.dot b/Documentation/gpu/dp-mst/topology-figure-3.dot
new file mode 100644
index 0000000000..6cd78d0677
--- /dev/null
+++ b/Documentation/gpu/dp-mst/topology-figure-3.dot
@@ -0,0 +1,59 @@
+digraph T {
+    /* Make sure our payloads are always drawn below the driver node */
+    subgraph cluster_driver {
+        fillcolor = grey;
+        style = filled;
+        edge [dir=none];
+        driver -> payload1;
+        driver -> payload2 [penwidth=3];
+        edge [dir=""];
+    }
+
+    /* Driver malloc references */
+    edge [style=dashed];
+    driver -> port1;
+    driver -> port2;
+    driver -> port3:e;
+    driver -> port4 [color=grey];
+    payload1:s -> port1:e;
+    payload2:s -> port3:e [penwidth=3];
+    edge [style=""];
+
+    subgraph cluster_topology {
+        label="Topology Manager";
+        labelloc=bottom;
+
+        /* Topology references */
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        edge [color=grey];
+        port2 -> mstb3 -> {port3, port4};
+        port3 -> mstb4;
+        edge [color=""];
+
+        /* Malloc references */
+        edge [style=dashed;dir=back];
+        mstb1 -> {port1, port2};
+        port1 -> mstb2;
+        port2 -> mstb3 [penwidth=3];
+        mstb3 -> port3 [penwidth=3];
+        edge [color=grey];
+        mstb3 -> port4;
+        port3 -> mstb4;
+    }
+
+    mstb1 [label="MSTB #1";style=filled;fillcolor=palegreen];
+    mstb2 [label="MSTB #2";style=filled;fillcolor=palegreen];
+    mstb3 [label="MSTB #3";style=filled;fillcolor=palegreen;penwidth=3];
+    mstb4 [label="MSTB #4";style=filled;fillcolor=grey];
+
+    port1 [label="Port #1"];
+    port2 [label="Port #2";penwidth=5];
+    port3 [label="Port #3";penwidth=3];
+    port4 [label="Port #4";style=filled;fillcolor=grey];
+
+    driver [label="DRM driver";style=filled;shape=box;fillcolor=lightblue];
+
+    payload1 [label="Payload #1";style=filled;shape=box;fillcolor=lightblue];
+    payload2 [label="Payload #2";style=filled;shape=box;fillcolor=lightblue;penwidth=3];
+}
diff --git a/Documentation/gpu/driver-uapi.rst b/Documentation/gpu/driver-uapi.rst
new file mode 100644
index 0000000000..c08bcbb95f
--- /dev/null
+++ b/Documentation/gpu/driver-uapi.rst
@@ -0,0 +1,19 @@
+===============
+DRM Driver uAPI
+===============
+
+drm/i915 uAPI
+=============
+
+.. kernel-doc:: include/uapi/drm/i915_drm.h
+
+drm/nouveau uAPI
+================
+
+VM_BIND / EXEC uAPI
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/nouveau/nouveau_exec.c
+    :doc: Overview
+
+.. kernel-doc:: include/uapi/drm/nouveau_drm.h
diff --git a/Documentation/gpu/drivers.rst b/Documentation/gpu/drivers.rst
new file mode 100644
index 0000000000..3a52f48215
--- /dev/null
+++ b/Documentation/gpu/drivers.rst
@@ -0,0 +1,27 @@
+========================
+GPU Driver Documentation
+========================
+
+.. toctree::
+
+   amdgpu/index
+   i915
+   mcde
+   meson
+   pl111
+   tegra
+   tve200
+   v3d
+   vc4
+   vkms
+   bridge/dw-hdmi
+   xen-front
+   afbc
+   komeda-kms
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`
diff --git a/Documentation/gpu/drm-client.rst b/Documentation/gpu/drm-client.rst
new file mode 100644
index 0000000000..58b5a1d121
--- /dev/null
+++ b/Documentation/gpu/drm-client.rst
@@ -0,0 +1,15 @@
+=================
+Kernel clients
+=================
+
+.. kernel-doc:: drivers/gpu/drm/drm_client.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_client.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_client.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_client_modeset.c
+   :export:
diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst
new file mode 100644
index 0000000000..5fd20a3067
--- /dev/null
+++ b/Documentation/gpu/drm-internals.rst
@@ -0,0 +1,273 @@
+=============
+DRM Internals
+=============
+
+This chapter documents DRM internals relevant to driver authors and
+developers working to add support for the latest features to existing
+drivers.
+
+First, we go over some typical driver initialization requirements, like
+setting up command buffers, creating an initial output configuration,
+and initializing core services. Subsequent sections cover core internals
+in more detail, providing implementation notes and examples.
+
+The DRM layer provides several services to graphics drivers, many of
+them driven by the application interfaces it provides through libdrm,
+the library that wraps most of the DRM ioctls. These include vblank
+event handling, memory management, output management, framebuffer
+management, command submission & fencing, suspend/resume support, and
+DMA services.
+
+Driver Initialization
+=====================
+
+At the core of every DRM driver is a :c:type:`struct drm_driver
+<drm_driver>` structure. Drivers typically statically initialize
+a drm_driver structure, and then pass it to
+drm_dev_alloc() to allocate a device instance. After the
+device instance is fully initialized it can be registered (which makes
+it accessible from userspace) using drm_dev_register().
+
+The :c:type:`struct drm_driver <drm_driver>` structure
+contains static information that describes the driver and features it
+supports, and pointers to methods that the DRM core will call to
+implement the DRM API. We will first go through the :c:type:`struct
+drm_driver <drm_driver>` static information fields, and will
+then describe individual operations in details as they get used in later
+sections.
+
+Driver Information
+------------------
+
+Major, Minor and Patchlevel
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+int major; int minor; int patchlevel;
+The DRM core identifies driver versions by a major, minor and patch
+level triplet. The information is printed to the kernel log at
+initialization time and passed to userspace through the
+DRM_IOCTL_VERSION ioctl.
+
+The major and minor numbers are also used to verify the requested driver
+API version passed to DRM_IOCTL_SET_VERSION. When the driver API
+changes between minor versions, applications can call
+DRM_IOCTL_SET_VERSION to select a specific version of the API. If the
+requested major isn't equal to the driver major, or the requested minor
+is larger than the driver minor, the DRM_IOCTL_SET_VERSION call will
+return an error. Otherwise the driver's set_version() method will be
+called with the requested version.
+
+Name, Description and Date
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+char \*name; char \*desc; char \*date;
+The driver name is printed to the kernel log at initialization time,
+used for IRQ registration and passed to userspace through
+DRM_IOCTL_VERSION.
+
+The driver description is a purely informative string passed to
+userspace through the DRM_IOCTL_VERSION ioctl and otherwise unused by
+the kernel.
+
+The driver date, formatted as YYYYMMDD, is meant to identify the date of
+the latest modification to the driver. However, as most drivers fail to
+update it, its value is mostly useless. The DRM core prints it to the
+kernel log at initialization time and passes it to userspace through the
+DRM_IOCTL_VERSION ioctl.
+
+Module Initialization
+---------------------
+
+.. kernel-doc:: include/drm/drm_module.h
+   :doc: overview
+
+Managing Ownership of the Framebuffer Aperture
+----------------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_aperture.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_aperture.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_aperture.c
+   :export:
+
+Device Instance and Driver Handling
+-----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_drv.c
+   :doc: driver instance overview
+
+.. kernel-doc:: include/drm/drm_device.h
+   :internal:
+
+.. kernel-doc:: include/drm/drm_drv.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_drv.c
+   :export:
+
+Driver Load
+-----------
+
+Component Helper Usage
+~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/drm_drv.c
+   :doc: component helper usage recommendations
+
+Memory Manager Initialization
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Every DRM driver requires a memory manager which must be initialized at
+load time. DRM currently contains two memory managers, the Translation
+Table Manager (TTM) and the Graphics Execution Manager (GEM). This
+document describes the use of the GEM memory manager only. See ? for
+details.
+
+Miscellaneous Device Configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Another task that may be necessary for PCI devices during configuration
+is mapping the video BIOS. On many devices, the VBIOS describes device
+configuration, LCD panel timings (if any), and contains flags indicating
+device state. Mapping the BIOS can be done using the pci_map_rom()
+call, a convenience function that takes care of mapping the actual ROM,
+whether it has been shadowed into memory (typically at address 0xc0000)
+or exists on the PCI device in the ROM BAR. Note that after the ROM has
+been mapped and any necessary information has been extracted, it should
+be unmapped; on many devices, the ROM address decoder is shared with
+other BARs, so leaving it mapped could cause undesired behaviour like
+hangs or memory corruption.
+
+Managed Resources
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_managed.c
+   :doc: managed resources
+
+.. kernel-doc:: drivers/gpu/drm/drm_managed.c
+   :export:
+
+.. kernel-doc:: include/drm/drm_managed.h
+   :internal:
+
+Bus-specific Device Registration and PCI Support
+------------------------------------------------
+
+A number of functions are provided to help with device registration. The
+functions deal with PCI and platform devices respectively and are only
+provided for historical reasons. These are all deprecated and shouldn't
+be used in new drivers. Besides that there's a few helpers for pci
+drivers.
+
+.. kernel-doc:: drivers/gpu/drm/drm_pci.c
+   :export:
+
+Open/Close, File Operations and IOCTLs
+======================================
+
+.. _drm_driver_fops:
+
+File Operations
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_file.c
+   :doc: file operations
+
+.. kernel-doc:: include/drm/drm_file.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_file.c
+   :export:
+
+Misc Utilities
+==============
+
+Printer
+-------
+
+.. kernel-doc:: include/drm/drm_print.h
+   :doc: print
+
+.. kernel-doc:: include/drm/drm_print.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_print.c
+   :export:
+
+Utilities
+---------
+
+.. kernel-doc:: include/drm/drm_util.h
+   :doc: drm utils
+
+.. kernel-doc:: include/drm/drm_util.h
+   :internal:
+
+
+Unit testing
+============
+
+KUnit
+-----
+
+KUnit (Kernel unit testing framework) provides a common framework for unit tests
+within the Linux kernel.
+
+This section covers the specifics for the DRM subsystem. For general information
+about KUnit, please refer to Documentation/dev-tools/kunit/start.rst.
+
+How to run the tests?
+~~~~~~~~~~~~~~~~~~~~~
+
+In order to facilitate running the test suite, a configuration file is present
+in ``drivers/gpu/drm/tests/.kunitconfig``. It can be used by ``kunit.py`` as
+follows:
+
+.. code-block:: bash
+
+	$ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/tests \
+		--kconfig_add CONFIG_VIRTIO_UML=y \
+		--kconfig_add CONFIG_UML_PCI_OVER_VIRTIO=y
+
+.. note::
+	The configuration included in ``.kunitconfig`` should be as generic as
+	possible.
+	``CONFIG_VIRTIO_UML`` and ``CONFIG_UML_PCI_OVER_VIRTIO`` are not
+	included in it because they are only required for User Mode Linux.
+
+
+Legacy Support Code
+===================
+
+The section very briefly covers some of the old legacy support code
+which is only used by old DRM drivers which have done a so-called
+shadow-attach to the underlying device instead of registering as a real
+driver. This also includes some of the old generic buffer management and
+command submission code. Do not use any of this in new and modern
+drivers.
+
+Legacy Suspend/Resume
+---------------------
+
+The DRM core provides some suspend/resume code, but drivers wanting full
+suspend/resume support should provide save() and restore() functions.
+These are called at suspend, hibernate, or resume time, and should
+perform any state save or restore required by your device across suspend
+or hibernate states.
+
+int (\*suspend) (struct drm_device \*, pm_message_t state); int
+(\*resume) (struct drm_device \*);
+Those are legacy suspend and resume methods which *only* work with the
+legacy shadow-attach driver registration functions. New driver should
+use the power management interface provided by their bus type (usually
+through the :c:type:`struct device_driver <device_driver>`
+dev_pm_ops) and set these methods to NULL.
+
+Legacy DMA Services
+-------------------
+
+This should cover how DMA mapping etc. is supported by the core. These
+functions are deprecated and should not be used.
diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
new file mode 100644
index 0000000000..b748b8ae70
--- /dev/null
+++ b/Documentation/gpu/drm-kms-helpers.rst
@@ -0,0 +1,465 @@
+=============================
+Mode Setting Helper Functions
+=============================
+
+The DRM subsystem aims for a strong separation between core code and helper
+libraries. Core code takes care of general setup and teardown and decoding
+userspace requests to kernel internal objects. Everything else is handled by a
+large set of helper libraries, which can be combined freely to pick and choose
+for each driver what fits, and avoid shared code where special behaviour is
+needed.
+
+This distinction between core code and helpers is especially strong in the
+modesetting code, where there's a shared userspace ABI for all drivers. This is
+in contrast to the render side, where pretty much everything (with very few
+exceptions) can be considered optional helper code.
+
+There are a few areas these helpers can grouped into:
+
+* Helpers to implement modesetting. The important ones here are the atomic
+  helpers. Old drivers still often use the legacy CRTC helpers. They both share
+  the same set of common helper vtables. For really simple drivers (anything
+  that would have been a great fit in the deprecated fbdev subsystem) there's
+  also the simple display pipe helpers.
+
+* There's a big pile of helpers for handling outputs. First the generic bridge
+  helpers for handling encoder and transcoder IP blocks. Second the panel helpers
+  for handling panel-related information and logic. Plus then a big set of
+  helpers for the various sink standards (DisplayPort, HDMI, MIPI DSI). Finally
+  there's also generic helpers for handling output probing, and for dealing with
+  EDIDs.
+
+* The last group of helpers concerns itself with the frontend side of a display
+  pipeline: Planes, handling rectangles for visibility checking and scissoring,
+  flip queues and assorted bits.
+
+Modeset Helper Reference for Common Vtables
+===========================================
+
+.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
+   :internal:
+
+.. _drm_atomic_helper:
+
+Atomic Modeset Helper Functions Reference
+=========================================
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
+   :doc: overview
+
+Implementing Asynchronous Atomic Commit
+---------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
+   :doc: implementing nonblocking commit
+
+Helper Functions Reference
+--------------------------
+
+.. kernel-doc:: include/drm/drm_atomic_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
+   :export:
+
+Atomic State Reset and Initialization
+-------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_state_helper.c
+   :doc: atomic state reset and initialization
+
+Atomic State Helper Reference
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_state_helper.c
+   :export:
+
+GEM Atomic Helper Reference
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_gem_atomic_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c
+   :export:
+
+Simple KMS Helper Reference
+===========================
+
+.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_simple_kms_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
+   :export:
+
+fbdev Helper Functions Reference
+================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
+   :doc: fbdev helpers
+
+.. kernel-doc:: include/drm/drm_fb_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_fbdev_generic.c
+   :export:
+
+format Helper Functions Reference
+=================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_format_helper.c
+   :export:
+
+Framebuffer DMA Helper Functions Reference
+==========================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c
+   :doc: framebuffer dma helper functions
+
+.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c
+   :export:
+
+Framebuffer GEM Helper Reference
+================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
+   :export:
+
+.. _drm_bridges:
+
+Bridges
+=======
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :doc: overview
+
+Display Driver Integration
+--------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :doc: display driver integration
+
+Special Care with MIPI-DSI bridges
+----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :doc: special care dsi
+
+Bridge Operations
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :doc: bridge operations
+
+Bridge Connector Helper
+-----------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge_connector.c
+   :doc: overview
+
+
+Bridge Helper Reference
+-------------------------
+
+.. kernel-doc:: include/drm/drm_bridge.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :export:
+
+MIPI-DSI bridge operation
+-------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
+   :doc: dsi bridge operations
+
+
+Bridge Connector Helper Reference
+---------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_bridge_connector.c
+   :export:
+
+Panel-Bridge Helper Reference
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/bridge/panel.c
+   :export:
+
+.. _drm_panel_helper:
+
+Panel Helper Reference
+======================
+
+.. kernel-doc:: drivers/gpu/drm/drm_panel.c
+   :doc: drm panel
+
+.. kernel-doc:: include/drm/drm_panel.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_panel.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_panel_orientation_quirks.c
+   :export:
+
+Panel Self Refresh Helper Reference
+===================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c
+   :export:
+
+HDCP Helper Functions Reference
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_hdcp_helper.c
+   :export:
+
+Display Port Helper Functions Reference
+=======================================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c
+   :doc: dp helpers
+
+.. kernel-doc:: include/drm/display/drm_dp.h
+   :internal:
+
+.. kernel-doc:: include/drm/display/drm_dp_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c
+   :export:
+
+Display Port CEC Helper Functions Reference
+===========================================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c
+   :doc: dp cec helpers
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c
+   :export:
+
+Display Port Dual Mode Adaptor Helper Functions Reference
+=========================================================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
+   :doc: dp dual mode helpers
+
+.. kernel-doc:: include/drm/display/drm_dp_dual_mode_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
+   :export:
+
+Display Port MST Helpers
+========================
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c
+   :doc: dp mst helper
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c
+   :doc: Branch device and port refcounting
+
+Functions Reference
+-------------------
+
+.. kernel-doc:: include/drm/display/drm_dp_mst_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c
+   :export:
+
+Topology Lifetime Internals
+---------------------------
+
+These functions aren't exported to drivers, but are documented here to help make
+the MST topology helpers easier to understand
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c
+   :functions: drm_dp_mst_topology_try_get_mstb drm_dp_mst_topology_get_mstb
+               drm_dp_mst_topology_put_mstb
+               drm_dp_mst_topology_try_get_port drm_dp_mst_topology_get_port
+               drm_dp_mst_topology_put_port
+               drm_dp_mst_get_mstb_malloc drm_dp_mst_put_mstb_malloc
+
+MIPI DBI Helper Functions Reference
+===================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_mipi_dbi.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_mipi_dbi.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_mipi_dbi.c
+   :export:
+
+MIPI DSI Helper Functions Reference
+===================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
+   :doc: dsi helpers
+
+.. kernel-doc:: include/drm/drm_mipi_dsi.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
+   :export:
+
+Display Stream Compression Helper Functions Reference
+=====================================================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c
+   :doc: dsc helpers
+
+.. kernel-doc:: include/drm/display/drm_dsc.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c
+   :export:
+
+Output Probing Helper Functions Reference
+=========================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
+   :doc: output probing helper overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
+   :export:
+
+EDID Helper Functions Reference
+===============================
+
+.. kernel-doc:: include/drm/drm_edid.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_edid.c
+   :export:
+
+SCDC Helper Functions Reference
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c
+   :doc: scdc helpers
+
+.. kernel-doc:: include/drm/display/drm_scdc_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c
+   :export:
+
+HDMI Infoframes Helper Reference
+================================
+
+Strictly speaking this is not a DRM helper library but generally usable
+by any driver interfacing with HDMI outputs like v4l or alsa drivers.
+But it nicely fits into the overall topic of mode setting helper
+libraries and hence is also included here.
+
+.. kernel-doc:: include/linux/hdmi.h
+   :internal:
+
+.. kernel-doc:: drivers/video/hdmi.c
+   :export:
+
+Rectangle Utilities Reference
+=============================
+
+.. kernel-doc:: include/drm/drm_rect.h
+   :doc: rect utils
+
+.. kernel-doc:: include/drm/drm_rect.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_rect.c
+   :export:
+
+Flip-work Helper Reference
+==========================
+
+.. kernel-doc:: include/drm/drm_flip_work.h
+   :doc: flip utils
+
+.. kernel-doc:: include/drm/drm_flip_work.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c
+   :export:
+
+Auxiliary Modeset Helpers
+=========================
+
+.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
+   :doc: aux kms helpers
+
+.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
+   :export:
+
+OF/DT Helpers
+=============
+
+.. kernel-doc:: drivers/gpu/drm/drm_of.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_of.c
+   :export:
+
+Legacy Plane Helper Reference
+=============================
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
+   :export:
+
+Legacy CRTC/Modeset Helper Functions Reference
+==============================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
+   :export:
+
+Privacy-screen class
+====================
+
+.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_privacy_screen_driver.h
+   :internal:
+
+.. kernel-doc:: include/drm/drm_privacy_screen_machine.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c
+   :export:
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
new file mode 100644
index 0000000000..690d2ffe72
--- /dev/null
+++ b/Documentation/gpu/drm-kms.rst
@@ -0,0 +1,621 @@
+=========================
+Kernel Mode Setting (KMS)
+=========================
+
+Drivers must initialize the mode setting core by calling
+drmm_mode_config_init() on the DRM device. The function
+initializes the :c:type:`struct drm_device <drm_device>`
+mode_config field and never fails. Once done, mode configuration must
+be setup by initializing the following fields.
+
+-  int min_width, min_height; int max_width, max_height;
+   Minimum and maximum width and height of the frame buffers in pixel
+   units.
+
+-  struct drm_mode_config_funcs \*funcs;
+   Mode setting functions.
+
+Overview
+========
+
+.. kernel-render:: DOT
+   :alt: KMS Display Pipeline
+   :caption: KMS Display Pipeline Overview
+
+   digraph "KMS" {
+      node [shape=box]
+
+      subgraph cluster_static {
+          style=dashed
+          label="Static Objects"
+
+          node [bgcolor=grey style=filled]
+          "drm_plane A" -> "drm_crtc"
+          "drm_plane B" -> "drm_crtc"
+          "drm_crtc" -> "drm_encoder A"
+          "drm_crtc" -> "drm_encoder B"
+      }
+
+      subgraph cluster_user_created {
+          style=dashed
+          label="Userspace-Created"
+
+          node [shape=oval]
+          "drm_framebuffer 1" -> "drm_plane A"
+          "drm_framebuffer 2" -> "drm_plane B"
+      }
+
+      subgraph cluster_connector {
+          style=dashed
+          label="Hotpluggable"
+
+          "drm_encoder A" -> "drm_connector A"
+          "drm_encoder B" -> "drm_connector B"
+      }
+   }
+
+The basic object structure KMS presents to userspace is fairly simple.
+Framebuffers (represented by :c:type:`struct drm_framebuffer <drm_framebuffer>`,
+see `Frame Buffer Abstraction`_) feed into planes. Planes are represented by
+:c:type:`struct drm_plane <drm_plane>`, see `Plane Abstraction`_ for more
+details. One or more (or even no) planes feed their pixel data into a CRTC
+(represented by :c:type:`struct drm_crtc <drm_crtc>`, see `CRTC Abstraction`_)
+for blending. The precise blending step is explained in more detail in `Plane
+Composition Properties`_ and related chapters.
+
+For the output routing the first step is encoders (represented by
+:c:type:`struct drm_encoder <drm_encoder>`, see `Encoder Abstraction`_). Those
+are really just internal artifacts of the helper libraries used to implement KMS
+drivers. Besides that they make it unnecessarily more complicated for userspace
+to figure out which connections between a CRTC and a connector are possible, and
+what kind of cloning is supported, they serve no purpose in the userspace API.
+Unfortunately encoders have been exposed to userspace, hence can't remove them
+at this point.  Furthermore the exposed restrictions are often wrongly set by
+drivers, and in many cases not powerful enough to express the real restrictions.
+A CRTC can be connected to multiple encoders, and for an active CRTC there must
+be at least one encoder.
+
+The final, and real, endpoint in the display chain is the connector (represented
+by :c:type:`struct drm_connector <drm_connector>`, see `Connector
+Abstraction`_). Connectors can have different possible encoders, but the kernel
+driver selects which encoder to use for each connector. The use case is DVI,
+which could switch between an analog and a digital encoder. Encoders can also
+drive multiple different connectors. There is exactly one active connector for
+every active encoder.
+
+Internally the output pipeline is a bit more complex and matches today's
+hardware more closely:
+
+.. kernel-render:: DOT
+   :alt: KMS Output Pipeline
+   :caption: KMS Output Pipeline
+
+   digraph "Output Pipeline" {
+      node [shape=box]
+
+      subgraph {
+          "drm_crtc" [bgcolor=grey style=filled]
+      }
+
+      subgraph cluster_internal {
+          style=dashed
+          label="Internal Pipeline"
+          {
+              node [bgcolor=grey style=filled]
+              "drm_encoder A";
+              "drm_encoder B";
+              "drm_encoder C";
+          }
+
+          {
+              node [bgcolor=grey style=filled]
+              "drm_encoder B" -> "drm_bridge B"
+              "drm_encoder C" -> "drm_bridge C1"
+              "drm_bridge C1" -> "drm_bridge C2";
+          }
+      }
+
+      "drm_crtc" -> "drm_encoder A"
+      "drm_crtc" -> "drm_encoder B"
+      "drm_crtc" -> "drm_encoder C"
+
+
+      subgraph cluster_output {
+          style=dashed
+          label="Outputs"
+
+          "drm_encoder A" -> "drm_connector A";
+          "drm_bridge B" -> "drm_connector B";
+          "drm_bridge C2" -> "drm_connector C";
+
+          "drm_panel"
+      }
+   }
+
+Internally two additional helper objects come into play. First, to be able to
+share code for encoders (sometimes on the same SoC, sometimes off-chip) one or
+more :ref:`drm_bridges` (represented by :c:type:`struct drm_bridge
+<drm_bridge>`) can be linked to an encoder. This link is static and cannot be
+changed, which means the cross-bar (if there is any) needs to be mapped between
+the CRTC and any encoders. Often for drivers with bridges there's no code left
+at the encoder level. Atomic drivers can leave out all the encoder callbacks to
+essentially only leave a dummy routing object behind, which is needed for
+backwards compatibility since encoders are exposed to userspace.
+
+The second object is for panels, represented by :c:type:`struct drm_panel
+<drm_panel>`, see :ref:`drm_panel_helper`. Panels do not have a fixed binding
+point, but are generally linked to the driver private structure that embeds
+:c:type:`struct drm_connector <drm_connector>`.
+
+Note that currently the bridge chaining and interactions with connectors and
+panels are still in-flux and not really fully sorted out yet.
+
+KMS Core Structures and Functions
+=================================
+
+.. kernel-doc:: include/drm/drm_mode_config.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_mode_config.c
+   :export:
+
+.. _kms_base_object_abstraction:
+
+Modeset Base Object Abstraction
+===============================
+
+.. kernel-render:: DOT
+   :alt: Mode Objects and Properties
+   :caption: Mode Objects and Properties
+
+   digraph {
+      node [shape=box]
+
+      "drm_property A" -> "drm_mode_object A"
+      "drm_property A" -> "drm_mode_object B"
+      "drm_property B" -> "drm_mode_object A"
+   }
+
+The base structure for all KMS objects is :c:type:`struct drm_mode_object
+<drm_mode_object>`. One of the base services it provides is tracking properties,
+which are especially important for the atomic IOCTL (see `Atomic Mode
+Setting`_). The somewhat surprising part here is that properties are not
+directly instantiated on each object, but free-standing mode objects themselves,
+represented by :c:type:`struct drm_property <drm_property>`, which only specify
+the type and value range of a property. Any given property can be attached
+multiple times to different objects using drm_object_attach_property().
+
+.. kernel-doc:: include/drm/drm_mode_object.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_mode_object.c
+   :export:
+
+Atomic Mode Setting
+===================
+
+
+.. kernel-render:: DOT
+   :alt: Mode Objects and Properties
+   :caption: Mode Objects and Properties
+
+   digraph {
+      node [shape=box]
+
+      subgraph cluster_state {
+          style=dashed
+          label="Free-standing state"
+
+          "drm_atomic_state" -> "duplicated drm_plane_state A"
+          "drm_atomic_state" -> "duplicated drm_plane_state B"
+          "drm_atomic_state" -> "duplicated drm_crtc_state"
+          "drm_atomic_state" -> "duplicated drm_connector_state"
+          "drm_atomic_state" -> "duplicated driver private state"
+      }
+
+      subgraph cluster_current {
+          style=dashed
+          label="Current state"
+
+          "drm_device" -> "drm_plane A"
+          "drm_device" -> "drm_plane B"
+          "drm_device" -> "drm_crtc"
+          "drm_device" -> "drm_connector"
+          "drm_device" -> "driver private object"
+
+          "drm_plane A" -> "drm_plane_state A"
+          "drm_plane B" -> "drm_plane_state B"
+          "drm_crtc" -> "drm_crtc_state"
+          "drm_connector" -> "drm_connector_state"
+          "driver private object" -> "driver private state"
+      }
+
+      "drm_atomic_state" -> "drm_device" [label="atomic_commit"]
+      "duplicated drm_plane_state A" -> "drm_device"[style=invis]
+   }
+
+Atomic provides transactional modeset (including planes) updates, but a
+bit differently from the usual transactional approach of try-commit and
+rollback:
+
+- Firstly, no hardware changes are allowed when the commit would fail. This
+  allows us to implement the DRM_MODE_ATOMIC_TEST_ONLY mode, which allows
+  userspace to explore whether certain configurations would work or not.
+
+- This would still allow setting and rollback of just the software state,
+  simplifying conversion of existing drivers. But auditing drivers for
+  correctness of the atomic_check code becomes really hard with that: Rolling
+  back changes in data structures all over the place is hard to get right.
+
+- Lastly, for backwards compatibility and to support all use-cases, atomic
+  updates need to be incremental and be able to execute in parallel. Hardware
+  doesn't always allow it, but where possible plane updates on different CRTCs
+  should not interfere, and not get stalled due to output routing changing on
+  different CRTCs.
+
+Taken all together there's two consequences for the atomic design:
+
+- The overall state is split up into per-object state structures:
+  :c:type:`struct drm_plane_state <drm_plane_state>` for planes, :c:type:`struct
+  drm_crtc_state <drm_crtc_state>` for CRTCs and :c:type:`struct
+  drm_connector_state <drm_connector_state>` for connectors. These are the only
+  objects with userspace-visible and settable state. For internal state drivers
+  can subclass these structures through embedding, or add entirely new state
+  structures for their globally shared hardware functions, see :c:type:`struct
+  drm_private_state<drm_private_state>`.
+
+- An atomic update is assembled and validated as an entirely free-standing pile
+  of structures within the :c:type:`drm_atomic_state <drm_atomic_state>`
+  container. Driver private state structures are also tracked in the same
+  structure; see the next chapter.  Only when a state is committed is it applied
+  to the driver and modeset objects. This way rolling back an update boils down
+  to releasing memory and unreferencing objects like framebuffers.
+
+Locking of atomic state structures is internally using :c:type:`struct
+drm_modeset_lock <drm_modeset_lock>`. As a general rule the locking shouldn't be
+exposed to drivers, instead the right locks should be automatically acquired by
+any function that duplicates or peeks into a state, like e.g.
+drm_atomic_get_crtc_state().  Locking only protects the software data
+structure, ordering of committing state changes to hardware is sequenced using
+:c:type:`struct drm_crtc_commit <drm_crtc_commit>`.
+
+Read on in this chapter, and also in :ref:`drm_atomic_helper` for more detailed
+coverage of specific topics.
+
+Handling Driver Private State
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
+   :doc: handling driver private state
+
+Atomic Mode Setting Function Reference
+--------------------------------------
+
+.. kernel-doc:: include/drm/drm_atomic.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
+   :export:
+
+Atomic Mode Setting IOCTL and UAPI Functions
+--------------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
+   :export:
+
+CRTC Abstraction
+================
+
+.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
+   :doc: overview
+
+CRTC Functions Reference
+--------------------------------
+
+.. kernel-doc:: include/drm/drm_crtc.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
+   :export:
+
+Color Management Functions Reference
+------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_color_mgmt.c
+   :export:
+
+.. kernel-doc:: include/drm/drm_color_mgmt.h
+   :internal:
+
+Frame Buffer Abstraction
+========================
+
+.. kernel-doc:: drivers/gpu/drm/drm_framebuffer.c
+   :doc: overview
+
+Frame Buffer Functions Reference
+--------------------------------
+
+.. kernel-doc:: include/drm/drm_framebuffer.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_framebuffer.c
+   :export:
+
+DRM Format Handling
+===================
+
+.. kernel-doc:: include/uapi/drm/drm_fourcc.h
+   :doc: overview
+
+Format Functions Reference
+--------------------------
+
+.. kernel-doc:: include/drm/drm_fourcc.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_fourcc.c
+   :export:
+
+Dumb Buffer Objects
+===================
+
+.. kernel-doc:: drivers/gpu/drm/drm_dumb_buffers.c
+   :doc: overview
+
+Plane Abstraction
+=================
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: overview
+
+Plane Functions Reference
+-------------------------
+
+.. kernel-doc:: include/drm/drm_plane.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :export:
+
+Plane Composition Functions Reference
+-------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_blend.c
+   :export:
+
+Plane Damage Tracking Functions Reference
+-----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_damage_helper.c
+   :export:
+
+.. kernel-doc:: include/drm/drm_damage_helper.h
+   :internal:
+
+Display Modes Function Reference
+================================
+
+.. kernel-doc:: include/drm/drm_modes.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_modes.c
+   :export:
+
+Connector Abstraction
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: overview
+
+Connector Functions Reference
+-----------------------------
+
+.. kernel-doc:: include/drm/drm_connector.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :export:
+
+Writeback Connectors
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_writeback.c
+  :doc: overview
+
+.. kernel-doc:: include/drm/drm_writeback.h
+  :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_writeback.c
+  :export:
+
+Encoder Abstraction
+===================
+
+.. kernel-doc:: drivers/gpu/drm/drm_encoder.c
+   :doc: overview
+
+Encoder Functions Reference
+---------------------------
+
+.. kernel-doc:: include/drm/drm_encoder.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_encoder.c
+   :export:
+
+KMS Locking
+===========
+
+.. kernel-doc:: drivers/gpu/drm/drm_modeset_lock.c
+   :doc: kms locking
+
+.. kernel-doc:: include/drm/drm_modeset_lock.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_modeset_lock.c
+   :export:
+
+KMS Properties
+==============
+
+This section of the documentation is primarily aimed at user-space developers.
+For the driver APIs, see the other sections.
+
+Requirements
+------------
+
+KMS drivers might need to add extra properties to support new features. Each
+new property introduced in a driver needs to meet a few requirements, in
+addition to the one mentioned above:
+
+* It must be standardized, documenting:
+
+  * The full, exact, name string;
+  * If the property is an enum, all the valid value name strings;
+  * What values are accepted, and what these values mean;
+  * What the property does and how it can be used;
+  * How the property might interact with other, existing properties.
+
+* It must provide a generic helper in the core code to register that
+  property on the object it attaches to.
+
+* Its content must be decoded by the core and provided in the object's
+  associated state structure. That includes anything drivers might want
+  to precompute, like struct drm_clip_rect for planes.
+
+* Its initial state must match the behavior prior to the property
+  introduction. This might be a fixed value matching what the hardware
+  does, or it may be inherited from the state the firmware left the
+  system in during boot.
+
+* An IGT test must be submitted where reasonable.
+
+Property Types and Blob Property Support
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_property.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_property.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_property.c
+   :export:
+
+.. _standard_connector_properties:
+
+Standard Connector Properties
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: standard connector properties
+
+HDMI Specific Connector Properties
+----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: HDMI connector properties
+
+Analog TV Specific Connector Properties
+---------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: Analog TV Connector Properties
+
+Standard CRTC Properties
+------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
+   :doc: standard CRTC properties
+
+Standard Plane Properties
+-------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: standard plane properties
+
+.. _plane_composition_properties:
+
+Plane Composition Properties
+----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_blend.c
+   :doc: overview
+
+.. _damage_tracking_properties:
+
+Damage Tracking Properties
+--------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: damage tracking
+
+Color Management Properties
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_color_mgmt.c
+   :doc: overview
+
+Tile Group Property
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: Tile group
+
+Explicit Fencing Properties
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
+   :doc: explicit fencing properties
+
+
+Variable Refresh Properties
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+   :doc: Variable refresh properties
+
+Existing KMS Properties
+-----------------------
+
+The following table gives description of drm properties exposed by various
+modules/drivers. Because this table is very unwieldy, do not add any new
+properties here. Instead document them in a section above.
+
+.. csv-table::
+   :header-rows: 1
+   :file: kms-properties.csv
+
+Vertical Blanking
+=================
+
+.. kernel-doc:: drivers/gpu/drm/drm_vblank.c
+   :doc: vblank handling
+
+Vertical Blanking and Interrupt Handling Functions Reference
+------------------------------------------------------------
+
+.. kernel-doc:: include/drm/drm_vblank.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_vblank.c
+   :export:
+
+Vertical Blank Work
+===================
+
+.. kernel-doc:: drivers/gpu/drm/drm_vblank_work.c
+   :doc: vblank works
+
+Vertical Blank Work Functions Reference
+---------------------------------------
+
+.. kernel-doc:: include/drm/drm_vblank_work.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_vblank_work.c
+   :export:
diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst
new file mode 100644
index 0000000000..c19b34b1c0
--- /dev/null
+++ b/Documentation/gpu/drm-mm.rst
@@ -0,0 +1,565 @@
+=====================
+DRM Memory Management
+=====================
+
+Modern Linux systems require large amount of graphics memory to store
+frame buffers, textures, vertices and other graphics-related data. Given
+the very dynamic nature of many of that data, managing graphics memory
+efficiently is thus crucial for the graphics stack and plays a central
+role in the DRM infrastructure.
+
+The DRM core includes two memory managers, namely Translation Table Manager
+(TTM) and Graphics Execution Manager (GEM). TTM was the first DRM memory
+manager to be developed and tried to be a one-size-fits-them all
+solution. It provides a single userspace API to accommodate the need of
+all hardware, supporting both Unified Memory Architecture (UMA) devices
+and devices with dedicated video RAM (i.e. most discrete video cards).
+This resulted in a large, complex piece of code that turned out to be
+hard to use for driver development.
+
+GEM started as an Intel-sponsored project in reaction to TTM's
+complexity. Its design philosophy is completely different: instead of
+providing a solution to every graphics memory-related problems, GEM
+identified common code between drivers and created a support library to
+share it. GEM has simpler initialization and execution requirements than
+TTM, but has no video RAM management capabilities and is thus limited to
+UMA devices.
+
+The Translation Table Manager (TTM)
+===================================
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_module.c
+   :doc: TTM
+
+.. kernel-doc:: include/drm/ttm/ttm_caching.h
+   :internal:
+
+TTM device object reference
+---------------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_device.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_device.c
+   :export:
+
+TTM resource placement reference
+--------------------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_placement.h
+   :internal:
+
+TTM resource object reference
+-----------------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_resource.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_resource.c
+   :export:
+
+TTM TT object reference
+-----------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_tt.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_tt.c
+   :export:
+
+TTM page pool reference
+-----------------------
+
+.. kernel-doc:: include/drm/ttm/ttm_pool.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/ttm/ttm_pool.c
+   :export:
+
+The Graphics Execution Manager (GEM)
+====================================
+
+The GEM design approach has resulted in a memory manager that doesn't
+provide full coverage of all (or even all common) use cases in its
+userspace or kernel API. GEM exposes a set of standard memory-related
+operations to userspace and a set of helper functions to drivers, and
+let drivers implement hardware-specific operations with their own
+private API.
+
+The GEM userspace API is described in the `GEM - the Graphics Execution
+Manager <http://lwn.net/Articles/283798/>`__ article on LWN. While
+slightly outdated, the document provides a good overview of the GEM API
+principles. Buffer allocation and read and write operations, described
+as part of the common GEM API, are currently implemented using
+driver-specific ioctls.
+
+GEM is data-agnostic. It manages abstract buffer objects without knowing
+what individual buffers contain. APIs that require knowledge of buffer
+contents or purpose, such as buffer allocation or synchronization
+primitives, are thus outside of the scope of GEM and must be implemented
+using driver-specific ioctls.
+
+On a fundamental level, GEM involves several operations:
+
+-  Memory allocation and freeing
+-  Command execution
+-  Aperture management at command execution time
+
+Buffer object allocation is relatively straightforward and largely
+provided by Linux's shmem layer, which provides memory to back each
+object.
+
+Device-specific operations, such as command execution, pinning, buffer
+read & write, mapping, and domain ownership transfers are left to
+driver-specific ioctls.
+
+GEM Initialization
+------------------
+
+Drivers that use GEM must set the DRIVER_GEM bit in the struct
+:c:type:`struct drm_driver <drm_driver>` driver_features
+field. The DRM core will then automatically initialize the GEM core
+before calling the load operation. Behind the scene, this will create a
+DRM Memory Manager object which provides an address space pool for
+object allocation.
+
+In a KMS configuration, drivers need to allocate and initialize a
+command ring buffer following core GEM initialization if required by the
+hardware. UMA devices usually have what is called a "stolen" memory
+region, which provides space for the initial framebuffer and large,
+contiguous memory regions required by the device. This space is
+typically not managed by GEM, and must be initialized separately into
+its own DRM MM object.
+
+GEM Objects Creation
+--------------------
+
+GEM splits creation of GEM objects and allocation of the memory that
+backs them in two distinct operations.
+
+GEM objects are represented by an instance of struct :c:type:`struct
+drm_gem_object <drm_gem_object>`. Drivers usually need to
+extend GEM objects with private information and thus create a
+driver-specific GEM object structure type that embeds an instance of
+struct :c:type:`struct drm_gem_object <drm_gem_object>`.
+
+To create a GEM object, a driver allocates memory for an instance of its
+specific GEM object type and initializes the embedded struct
+:c:type:`struct drm_gem_object <drm_gem_object>` with a call
+to drm_gem_object_init(). The function takes a pointer
+to the DRM device, a pointer to the GEM object and the buffer object
+size in bytes.
+
+GEM uses shmem to allocate anonymous pageable memory.
+drm_gem_object_init() will create an shmfs file of the
+requested size and store it into the struct :c:type:`struct
+drm_gem_object <drm_gem_object>` filp field. The memory is
+used as either main storage for the object when the graphics hardware
+uses system memory directly or as a backing store otherwise.
+
+Drivers are responsible for the actual physical pages allocation by
+calling shmem_read_mapping_page_gfp() for each page.
+Note that they can decide to allocate pages when initializing the GEM
+object, or to delay allocation until the memory is needed (for instance
+when a page fault occurs as a result of a userspace memory access or
+when the driver needs to start a DMA transfer involving the memory).
+
+Anonymous pageable memory allocation is not always desired, for instance
+when the hardware requires physically contiguous system memory as is
+often the case in embedded devices. Drivers can create GEM objects with
+no shmfs backing (called private GEM objects) by initializing them with a call
+to drm_gem_private_object_init() instead of drm_gem_object_init(). Storage for
+private GEM objects must be managed by drivers.
+
+GEM Objects Lifetime
+--------------------
+
+All GEM objects are reference-counted by the GEM core. References can be
+acquired and release by calling drm_gem_object_get() and drm_gem_object_put()
+respectively.
+
+When the last reference to a GEM object is released the GEM core calls
+the :c:type:`struct drm_gem_object_funcs <gem_object_funcs>` free
+operation. That operation is mandatory for GEM-enabled drivers and must
+free the GEM object and all associated resources.
+
+void (\*free) (struct drm_gem_object \*obj); Drivers are
+responsible for freeing all GEM object resources. This includes the
+resources created by the GEM core, which need to be released with
+drm_gem_object_release().
+
+GEM Objects Naming
+------------------
+
+Communication between userspace and the kernel refers to GEM objects
+using local handles, global names or, more recently, file descriptors.
+All of those are 32-bit integer values; the usual Linux kernel limits
+apply to the file descriptors.
+
+GEM handles are local to a DRM file. Applications get a handle to a GEM
+object through a driver-specific ioctl, and can use that handle to refer
+to the GEM object in other standard or driver-specific ioctls. Closing a
+DRM file handle frees all its GEM handles and dereferences the
+associated GEM objects.
+
+To create a handle for a GEM object drivers call drm_gem_handle_create(). The
+function takes a pointer to the DRM file and the GEM object and returns a
+locally unique handle.  When the handle is no longer needed drivers delete it
+with a call to drm_gem_handle_delete(). Finally the GEM object associated with a
+handle can be retrieved by a call to drm_gem_object_lookup().
+
+Handles don't take ownership of GEM objects, they only take a reference
+to the object that will be dropped when the handle is destroyed. To
+avoid leaking GEM objects, drivers must make sure they drop the
+reference(s) they own (such as the initial reference taken at object
+creation time) as appropriate, without any special consideration for the
+handle. For example, in the particular case of combined GEM object and
+handle creation in the implementation of the dumb_create operation,
+drivers must drop the initial reference to the GEM object before
+returning the handle.
+
+GEM names are similar in purpose to handles but are not local to DRM
+files. They can be passed between processes to reference a GEM object
+globally. Names can't be used directly to refer to objects in the DRM
+API, applications must convert handles to names and names to handles
+using the DRM_IOCTL_GEM_FLINK and DRM_IOCTL_GEM_OPEN ioctls
+respectively. The conversion is handled by the DRM core without any
+driver-specific support.
+
+GEM also supports buffer sharing with dma-buf file descriptors through
+PRIME. GEM-based drivers must use the provided helpers functions to
+implement the exporting and importing correctly. See ?. Since sharing
+file descriptors is inherently more secure than the easily guessable and
+global GEM names it is the preferred buffer sharing mechanism. Sharing
+buffers through GEM names is only supported for legacy userspace.
+Furthermore PRIME also allows cross-device buffer sharing since it is
+based on dma-bufs.
+
+GEM Objects Mapping
+-------------------
+
+Because mapping operations are fairly heavyweight GEM favours
+read/write-like access to buffers, implemented through driver-specific
+ioctls, over mapping buffers to userspace. However, when random access
+to the buffer is needed (to perform software rendering for instance),
+direct access to the object can be more efficient.
+
+The mmap system call can't be used directly to map GEM objects, as they
+don't have their own file handle. Two alternative methods currently
+co-exist to map GEM objects to userspace. The first method uses a
+driver-specific ioctl to perform the mapping operation, calling
+do_mmap() under the hood. This is often considered
+dubious, seems to be discouraged for new GEM-enabled drivers, and will
+thus not be described here.
+
+The second method uses the mmap system call on the DRM file handle. void
+\*mmap(void \*addr, size_t length, int prot, int flags, int fd, off_t
+offset); DRM identifies the GEM object to be mapped by a fake offset
+passed through the mmap offset argument. Prior to being mapped, a GEM
+object must thus be associated with a fake offset. To do so, drivers
+must call drm_gem_create_mmap_offset() on the object.
+
+Once allocated, the fake offset value must be passed to the application
+in a driver-specific way and can then be used as the mmap offset
+argument.
+
+The GEM core provides a helper method drm_gem_mmap() to
+handle object mapping. The method can be set directly as the mmap file
+operation handler. It will look up the GEM object based on the offset
+value and set the VMA operations to the :c:type:`struct drm_driver
+<drm_driver>` gem_vm_ops field. Note that drm_gem_mmap() doesn't map memory to
+userspace, but relies on the driver-provided fault handler to map pages
+individually.
+
+To use drm_gem_mmap(), drivers must fill the struct :c:type:`struct drm_driver
+<drm_driver>` gem_vm_ops field with a pointer to VM operations.
+
+The VM operations is a :c:type:`struct vm_operations_struct <vm_operations_struct>`
+made up of several fields, the more interesting ones being:
+
+.. code-block:: c
+
+	struct vm_operations_struct {
+		void (*open)(struct vm_area_struct * area);
+		void (*close)(struct vm_area_struct * area);
+		vm_fault_t (*fault)(struct vm_fault *vmf);
+	};
+
+
+The open and close operations must update the GEM object reference
+count. Drivers can use the drm_gem_vm_open() and drm_gem_vm_close() helper
+functions directly as open and close handlers.
+
+The fault operation handler is responsible for mapping individual pages
+to userspace when a page fault occurs. Depending on the memory
+allocation scheme, drivers can allocate pages at fault time, or can
+decide to allocate memory for the GEM object at the time the object is
+created.
+
+Drivers that want to map the GEM object upfront instead of handling page
+faults can implement their own mmap file operation handler.
+
+For platforms without MMU the GEM core provides a helper method
+drm_gem_dma_get_unmapped_area(). The mmap() routines will call this to get a
+proposed address for the mapping.
+
+To use drm_gem_dma_get_unmapped_area(), drivers must fill the struct
+:c:type:`struct file_operations <file_operations>` get_unmapped_area field with
+a pointer on drm_gem_dma_get_unmapped_area().
+
+More detailed information about get_unmapped_area can be found in
+Documentation/admin-guide/mm/nommu-mmap.rst
+
+Memory Coherency
+----------------
+
+When mapped to the device or used in a command buffer, backing pages for
+an object are flushed to memory and marked write combined so as to be
+coherent with the GPU. Likewise, if the CPU accesses an object after the
+GPU has finished rendering to the object, then the object must be made
+coherent with the CPU's view of memory, usually involving GPU cache
+flushing of various kinds. This core CPU<->GPU coherency management is
+provided by a device-specific ioctl, which evaluates an object's current
+domain and performs any necessary flushing or synchronization to put the
+object into the desired coherency domain (note that the object may be
+busy, i.e. an active render target; in that case, setting the domain
+blocks the client and waits for rendering to complete before performing
+any necessary flushing operations).
+
+Command Execution
+-----------------
+
+Perhaps the most important GEM function for GPU devices is providing a
+command execution interface to clients. Client programs construct
+command buffers containing references to previously allocated memory
+objects, and then submit them to GEM. At that point, GEM takes care to
+bind all the objects into the GTT, execute the buffer, and provide
+necessary synchronization between clients accessing the same buffers.
+This often involves evicting some objects from the GTT and re-binding
+others (a fairly expensive operation), and providing relocation support
+which hides fixed GTT offsets from clients. Clients must take care not
+to submit command buffers that reference more objects than can fit in
+the GTT; otherwise, GEM will reject them and no rendering will occur.
+Similarly, if several objects in the buffer require fence registers to
+be allocated for correct rendering (e.g. 2D blits on pre-965 chips),
+care must be taken not to require more fence registers than are
+available to the client. Such resource management should be abstracted
+from the client in libdrm.
+
+GEM Function Reference
+----------------------
+
+.. kernel-doc:: include/drm/drm_gem.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem.c
+   :export:
+
+GEM DMA Helper Functions Reference
+----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c
+   :doc: dma helpers
+
+.. kernel-doc:: include/drm/drm_gem_dma_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c
+   :export:
+
+GEM SHMEM Helper Function Reference
+-----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_gem_shmem_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
+   :export:
+
+GEM VRAM Helper Functions Reference
+-----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_vram_helper.c
+   :doc: overview
+
+.. kernel-doc:: include/drm/drm_gem_vram_helper.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_vram_helper.c
+   :export:
+
+GEM TTM Helper Functions Reference
+-----------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
+   :export:
+
+VMA Offset Manager
+==================
+
+.. kernel-doc:: drivers/gpu/drm/drm_vma_manager.c
+   :doc: vma offset manager
+
+.. kernel-doc:: include/drm/drm_vma_manager.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_vma_manager.c
+   :export:
+
+.. _prime_buffer_sharing:
+
+PRIME Buffer Sharing
+====================
+
+PRIME is the cross device buffer sharing framework in drm, originally
+created for the OPTIMUS range of multi-gpu platforms. To userspace PRIME
+buffers are dma-buf based file descriptors.
+
+Overview and Lifetime Rules
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_prime.c
+   :doc: overview and lifetime rules
+
+PRIME Helper Functions
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_prime.c
+   :doc: PRIME Helpers
+
+PRIME Function References
+-------------------------
+
+.. kernel-doc:: include/drm/drm_prime.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_prime.c
+   :export:
+
+DRM MM Range Allocator
+======================
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/drm_mm.c
+   :doc: Overview
+
+LRU Scan/Eviction Support
+-------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_mm.c
+   :doc: lru scan roster
+
+DRM MM Range Allocator Function References
+------------------------------------------
+
+.. kernel-doc:: include/drm/drm_mm.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_mm.c
+   :export:
+
+DRM GPU VA Manager
+==================
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+   :doc: Overview
+
+Split and Merge
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+   :doc: Split and Merge
+
+Locking
+-------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+   :doc: Locking
+
+Examples
+--------
+
+.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+   :doc: Examples
+
+DRM GPU VA Manager Function References
+--------------------------------------
+
+.. kernel-doc:: include/drm/drm_gpuva_mgr.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+   :export:
+
+DRM Buddy Allocator
+===================
+
+DRM Buddy Function References
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_buddy.c
+   :export:
+
+DRM Cache Handling and Fast WC memcpy()
+=======================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_cache.c
+   :export:
+
+.. _drm_sync_objects:
+
+DRM Sync Objects
+================
+
+.. kernel-doc:: drivers/gpu/drm/drm_syncobj.c
+   :doc: Overview
+
+.. kernel-doc:: include/drm/drm_syncobj.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_syncobj.c
+   :export:
+
+DRM Execution context
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/drm_exec.c
+   :doc: Overview
+
+.. kernel-doc:: include/drm/drm_exec.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_exec.c
+   :export:
+
+GPU Scheduler
+=============
+
+Overview
+--------
+
+.. kernel-doc:: drivers/gpu/drm/scheduler/sched_main.c
+   :doc: Overview
+
+Scheduler Function References
+-----------------------------
+
+.. kernel-doc:: include/drm/gpu_scheduler.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/scheduler/sched_main.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/scheduler/sched_entity.c
+   :export:
diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
new file mode 100644
index 0000000000..65fb3036a5
--- /dev/null
+++ b/Documentation/gpu/drm-uapi.rst
@@ -0,0 +1,488 @@
+.. Copyright 2020 DisplayLink (UK) Ltd.
+
+===================
+Userland interfaces
+===================
+
+The DRM core exports several interfaces to applications, generally
+intended to be used through corresponding libdrm wrapper functions. In
+addition, drivers export device-specific interfaces for use by userspace
+drivers & device-aware applications through ioctls and sysfs files.
+
+External interfaces include: memory mapping, context management, DMA
+operations, AGP management, vblank control, fence management, memory
+management, and output management.
+
+Cover generic ioctls and sysfs layout here. We only need high-level
+info, since man pages should cover the rest.
+
+libdrm Device Lookup
+====================
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
+   :doc: getunique and setversion story
+
+
+.. _drm_primary_node:
+
+Primary Nodes, DRM Master and Authentication
+============================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_auth.c
+   :doc: master and authentication
+
+.. kernel-doc:: drivers/gpu/drm/drm_auth.c
+   :export:
+
+.. kernel-doc:: include/drm/drm_auth.h
+   :internal:
+
+
+.. _drm_leasing:
+
+DRM Display Resource Leasing
+============================
+
+.. kernel-doc:: drivers/gpu/drm/drm_lease.c
+   :doc: drm leasing
+
+Open-Source Userspace Requirements
+==================================
+
+The DRM subsystem has stricter requirements than most other kernel subsystems on
+what the userspace side for new uAPI needs to look like. This section here
+explains what exactly those requirements are, and why they exist.
+
+The short summary is that any addition of DRM uAPI requires corresponding
+open-sourced userspace patches, and those patches must be reviewed and ready for
+merging into a suitable and canonical upstream project.
+
+GFX devices (both display and render/GPU side) are really complex bits of
+hardware, with userspace and kernel by necessity having to work together really
+closely.  The interfaces, for rendering and modesetting, must be extremely wide
+and flexible, and therefore it is almost always impossible to precisely define
+them for every possible corner case. This in turn makes it really practically
+infeasible to differentiate between behaviour that's required by userspace, and
+which must not be changed to avoid regressions, and behaviour which is only an
+accidental artifact of the current implementation.
+
+Without access to the full source code of all userspace users that means it
+becomes impossible to change the implementation details, since userspace could
+depend upon the accidental behaviour of the current implementation in minute
+details. And debugging such regressions without access to source code is pretty
+much impossible. As a consequence this means:
+
+- The Linux kernel's "no regression" policy holds in practice only for
+  open-source userspace of the DRM subsystem. DRM developers are perfectly fine
+  if closed-source blob drivers in userspace use the same uAPI as the open
+  drivers, but they must do so in the exact same way as the open drivers.
+  Creative (ab)use of the interfaces will, and in the past routinely has, lead
+  to breakage.
+
+- Any new userspace interface must have an open-source implementation as
+  demonstration vehicle.
+
+The other reason for requiring open-source userspace is uAPI review. Since the
+kernel and userspace parts of a GFX stack must work together so closely, code
+review can only assess whether a new interface achieves its goals by looking at
+both sides. Making sure that the interface indeed covers the use-case fully
+leads to a few additional requirements:
+
+- The open-source userspace must not be a toy/test application, but the real
+  thing. Specifically it needs to handle all the usual error and corner cases.
+  These are often the places where new uAPI falls apart and hence essential to
+  assess the fitness of a proposed interface.
+
+- The userspace side must be fully reviewed and tested to the standards of that
+  userspace project. For e.g. mesa this means piglit testcases and review on the
+  mailing list. This is again to ensure that the new interface actually gets the
+  job done.  The userspace-side reviewer should also provide an Acked-by on the
+  kernel uAPI patch indicating that they believe the proposed uAPI is sound and
+  sufficiently documented and validated for userspace's consumption.
+
+- The userspace patches must be against the canonical upstream, not some vendor
+  fork. This is to make sure that no one cheats on the review and testing
+  requirements by doing a quick fork.
+
+- The kernel patch can only be merged after all the above requirements are met,
+  but it **must** be merged to either drm-next or drm-misc-next **before** the
+  userspace patches land. uAPI always flows from the kernel, doing things the
+  other way round risks divergence of the uAPI definitions and header files.
+
+These are fairly steep requirements, but have grown out from years of shared
+pain and experience with uAPI added hastily, and almost always regretted about
+just as fast. GFX devices change really fast, requiring a paradigm shift and
+entire new set of uAPI interfaces every few years at least. Together with the
+Linux kernel's guarantee to keep existing userspace running for 10+ years this
+is already rather painful for the DRM subsystem, with multiple different uAPIs
+for the same thing co-existing. If we add a few more complete mistakes into the
+mix every year it would be entirely unmanageable.
+
+.. _drm_render_node:
+
+Render nodes
+============
+
+DRM core provides multiple character-devices for user-space to use.
+Depending on which device is opened, user-space can perform a different
+set of operations (mainly ioctls). The primary node is always created
+and called card<num>. Additionally, a currently unused control node,
+called controlD<num> is also created. The primary node provides all
+legacy operations and historically was the only interface used by
+userspace. With KMS, the control node was introduced. However, the
+planned KMS control interface has never been written and so the control
+node stays unused to date.
+
+With the increased use of offscreen renderers and GPGPU applications,
+clients no longer require running compositors or graphics servers to
+make use of a GPU. But the DRM API required unprivileged clients to
+authenticate to a DRM-Master prior to getting GPU access. To avoid this
+step and to grant clients GPU access without authenticating, render
+nodes were introduced. Render nodes solely serve render clients, that
+is, no modesetting or privileged ioctls can be issued on render nodes.
+Only non-global rendering commands are allowed. If a driver supports
+render nodes, it must advertise it via the DRIVER_RENDER DRM driver
+capability. If not supported, the primary node must be used for render
+clients together with the legacy drmAuth authentication procedure.
+
+If a driver advertises render node support, DRM core will create a
+separate render node called renderD<num>. There will be one render node
+per device. No ioctls except PRIME-related ioctls will be allowed on
+this node. Especially GEM_OPEN will be explicitly prohibited. For a
+complete list of driver-independent ioctls that can be used on render
+nodes, see the ioctls marked DRM_RENDER_ALLOW in drm_ioctl.c  Render
+nodes are designed to avoid the buffer-leaks, which occur if clients
+guess the flink names or mmap offsets on the legacy interface.
+Additionally to this basic interface, drivers must mark their
+driver-dependent render-only ioctls as DRM_RENDER_ALLOW so render
+clients can use them. Driver authors must be careful not to allow any
+privileged ioctls on render nodes.
+
+With render nodes, user-space can now control access to the render node
+via basic file-system access-modes. A running graphics server which
+authenticates clients on the privileged primary/legacy node is no longer
+required. Instead, a client can open the render node and is immediately
+granted GPU access. Communication between clients (or servers) is done
+via PRIME. FLINK from render node to legacy node is not supported. New
+clients must not use the insecure FLINK interface.
+
+Besides dropping all modeset/global ioctls, render nodes also drop the
+DRM-Master concept. There is no reason to associate render clients with
+a DRM-Master as they are independent of any graphics server. Besides,
+they must work without any running master, anyway. Drivers must be able
+to run without a master object if they support render nodes. If, on the
+other hand, a driver requires shared state between clients which is
+visible to user-space and accessible beyond open-file boundaries, they
+cannot support render nodes.
+
+Device Hot-Unplug
+=================
+
+.. note::
+   The following is the plan. Implementation is not there yet
+   (2020 May).
+
+Graphics devices (display and/or render) may be connected via USB (e.g.
+display adapters or docking stations) or Thunderbolt (e.g. eGPU). An end
+user is able to hot-unplug this kind of devices while they are being
+used, and expects that the very least the machine does not crash. Any
+damage from hot-unplugging a DRM device needs to be limited as much as
+possible and userspace must be given the chance to handle it if it wants
+to. Ideally, unplugging a DRM device still lets a desktop continue to
+run, but that is going to need explicit support throughout the whole
+graphics stack: from kernel and userspace drivers, through display
+servers, via window system protocols, and in applications and libraries.
+
+Other scenarios that should lead to the same are: unrecoverable GPU
+crash, PCI device disappearing off the bus, or forced unbind of a driver
+from the physical device.
+
+In other words, from userspace perspective everything needs to keep on
+working more or less, until userspace stops using the disappeared DRM
+device and closes it completely. Userspace will learn of the device
+disappearance from the device removed uevent, ioctls returning ENODEV
+(or driver-specific ioctls returning driver-specific things), or open()
+returning ENXIO.
+
+Only after userspace has closed all relevant DRM device and dmabuf file
+descriptors and removed all mmaps, the DRM driver can tear down its
+instance for the device that no longer exists. If the same physical
+device somehow comes back in the mean time, it shall be a new DRM
+device.
+
+Similar to PIDs, chardev minor numbers are not recycled immediately. A
+new DRM device always picks the next free minor number compared to the
+previous one allocated, and wraps around when minor numbers are
+exhausted.
+
+The goal raises at least the following requirements for the kernel and
+drivers.
+
+Requirements for KMS UAPI
+-------------------------
+
+- KMS connectors must change their status to disconnected.
+
+- Legacy modesets and pageflips, and atomic commits, both real and
+  TEST_ONLY, and any other ioctls either fail with ENODEV or fake
+  success.
+
+- Pending non-blocking KMS operations deliver the DRM events userspace
+  is expecting. This applies also to ioctls that faked success.
+
+- open() on a device node whose underlying device has disappeared will
+  fail with ENXIO.
+
+- Attempting to create a DRM lease on a disappeared DRM device will
+  fail with ENODEV. Existing DRM leases remain and work as listed
+  above.
+
+Requirements for Render and Cross-Device UAPI
+---------------------------------------------
+
+- All GPU jobs that can no longer run must have their fences
+  force-signalled to avoid inflicting hangs on userspace.
+  The associated error code is ENODEV.
+
+- Some userspace APIs already define what should happen when the device
+  disappears (OpenGL, GL ES: `GL_KHR_robustness`_; `Vulkan`_:
+  VK_ERROR_DEVICE_LOST; etc.). DRM drivers are free to implement this
+  behaviour the way they see best, e.g. returning failures in
+  driver-specific ioctls and handling those in userspace drivers, or
+  rely on uevents, and so on.
+
+- dmabuf which point to memory that has disappeared will either fail to
+  import with ENODEV or continue to be successfully imported if it would
+  have succeeded before the disappearance. See also about memory maps
+  below for already imported dmabufs.
+
+- Attempting to import a dmabuf to a disappeared device will either fail
+  with ENODEV or succeed if it would have succeeded without the
+  disappearance.
+
+- open() on a device node whose underlying device has disappeared will
+  fail with ENXIO.
+
+.. _GL_KHR_robustness: https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_robustness.txt
+.. _Vulkan: https://www.khronos.org/vulkan/
+
+Requirements for Memory Maps
+----------------------------
+
+Memory maps have further requirements that apply to both existing maps
+and maps created after the device has disappeared. If the underlying
+memory disappears, the map is created or modified such that reads and
+writes will still complete successfully but the result is undefined.
+This applies to both userspace mmap()'d memory and memory pointed to by
+dmabuf which might be mapped to other devices (cross-device dmabuf
+imports).
+
+Raising SIGBUS is not an option, because userspace cannot realistically
+handle it. Signal handlers are global, which makes them extremely
+difficult to use correctly from libraries like those that Mesa produces.
+Signal handlers are not composable, you can't have different handlers
+for GPU1 and GPU2 from different vendors, and a third handler for
+mmapped regular files. Threads cause additional pain with signal
+handling as well.
+
+.. _drm_driver_ioctl:
+
+IOCTL Support on Device Nodes
+=============================
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
+   :doc: driver specific ioctls
+
+Recommended IOCTL Return Values
+-------------------------------
+
+In theory a driver's IOCTL callback is only allowed to return very few error
+codes. In practice it's good to abuse a few more. This section documents common
+practice within the DRM subsystem:
+
+ENOENT:
+        Strictly this should only be used when a file doesn't exist e.g. when
+        calling the open() syscall. We reuse that to signal any kind of object
+        lookup failure, e.g. for unknown GEM buffer object handles, unknown KMS
+        object handles and similar cases.
+
+ENOSPC:
+        Some drivers use this to differentiate "out of kernel memory" from "out
+        of VRAM". Sometimes also applies to other limited gpu resources used for
+        rendering (e.g. when you have a special limited compression buffer).
+        Sometimes resource allocation/reservation issues in command submission
+        IOCTLs are also signalled through EDEADLK.
+
+        Simply running out of kernel/system memory is signalled through ENOMEM.
+
+EPERM/EACCES:
+        Returned for an operation that is valid, but needs more privileges.
+        E.g. root-only or much more common, DRM master-only operations return
+        this when called by unpriviledged clients. There's no clear
+        difference between EACCES and EPERM.
+
+ENODEV:
+        The device is not present anymore or is not yet fully initialized.
+
+EOPNOTSUPP:
+        Feature (like PRIME, modesetting, GEM) is not supported by the driver.
+
+ENXIO:
+        Remote failure, either a hardware transaction (like i2c), but also used
+        when the exporting driver of a shared dma-buf or fence doesn't support a
+        feature needed.
+
+EINTR:
+        DRM drivers assume that userspace restarts all IOCTLs. Any DRM IOCTL can
+        return EINTR and in such a case should be restarted with the IOCTL
+        parameters left unchanged.
+
+EIO:
+        The GPU died and couldn't be resurrected through a reset. Modesetting
+        hardware failures are signalled through the "link status" connector
+        property.
+
+EINVAL:
+        Catch-all for anything that is an invalid argument combination which
+        cannot work.
+
+IOCTL also use other error codes like ETIME, EFAULT, EBUSY, ENOTTY but their
+usage is in line with the common meanings. The above list tries to just document
+DRM specific patterns. Note that ENOTTY has the slightly unintuitive meaning of
+"this IOCTL does not exist", and is used exactly as such in DRM.
+
+.. kernel-doc:: include/drm/drm_ioctl.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/drm_ioc32.c
+   :export:
+
+Testing and validation
+======================
+
+Testing Requirements for userspace API
+--------------------------------------
+
+New cross-driver userspace interface extensions, like new IOCTL, new KMS
+properties, new files in sysfs or anything else that constitutes an API change
+should have driver-agnostic testcases in IGT for that feature, if such a test
+can be reasonably made using IGT for the target hardware.
+
+Validating changes with IGT
+---------------------------
+
+There's a collection of tests that aims to cover the whole functionality of
+DRM drivers and that can be used to check that changes to DRM drivers or the
+core don't regress existing functionality. This test suite is called IGT and
+its code and instructions to build and run can be found in
+https://gitlab.freedesktop.org/drm/igt-gpu-tools/.
+
+Using VKMS to test DRM API
+--------------------------
+
+VKMS is a software-only model of a KMS driver that is useful for testing
+and for running compositors. VKMS aims to enable a virtual display without
+the need for a hardware display capability. These characteristics made VKMS
+a perfect tool for validating the DRM core behavior and also support the
+compositor developer. VKMS makes it possible to test DRM functions in a
+virtual machine without display, simplifying the validation of some of the
+core changes.
+
+To Validate changes in DRM API with VKMS, start setting the kernel: make
+sure to enable VKMS module; compile the kernel with the VKMS enabled and
+install it in the target machine. VKMS can be run in a Virtual Machine
+(QEMU, virtme or similar). It's recommended the use of KVM with the minimum
+of 1GB of RAM and four cores.
+
+It's possible to run the IGT-tests in a VM in two ways:
+
+	1. Use IGT inside a VM
+	2. Use IGT from the host machine and write the results in a shared directory.
+
+Following is an example of using a VM with a shared directory with
+the host machine to run igt-tests. This example uses virtme::
+
+	$ virtme-run --rwdir /path/for/shared_dir --kdir=path/for/kernel/directory --mods=auto
+
+Run the igt-tests in the guest machine. This example runs the 'kms_flip'
+tests::
+
+	$ /path/for/igt-gpu-tools/scripts/run-tests.sh -p -s -t "kms_flip.*" -v
+
+In this example, instead of building the igt_runner, Piglit is used
+(-p option). It creates an HTML summary of the test results and saves
+them in the folder "igt-gpu-tools/results". It executes only the igt-tests
+matching the -t option.
+
+Display CRC Support
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_debugfs_crc.c
+   :doc: CRC ABI
+
+.. kernel-doc:: drivers/gpu/drm/drm_debugfs_crc.c
+   :export:
+
+Debugfs Support
+---------------
+
+.. kernel-doc:: include/drm/drm_debugfs.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_debugfs.c
+   :export:
+
+Sysfs Support
+=============
+
+.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_sysfs.c
+   :export:
+
+
+VBlank event handling
+=====================
+
+The DRM core exposes two vertical blank related ioctls:
+
+DRM_IOCTL_WAIT_VBLANK
+    This takes a struct drm_wait_vblank structure as its argument, and
+    it is used to block or request a signal when a specified vblank
+    event occurs.
+
+DRM_IOCTL_MODESET_CTL
+    This was only used for user-mode-settind drivers around modesetting
+    changes to allow the kernel to update the vblank interrupt after
+    mode setting, since on many devices the vertical blank counter is
+    reset to 0 at some point during modeset. Modern drivers should not
+    call this any more since with kernel mode setting it is a no-op.
+
+Userspace API Structures
+========================
+
+.. kernel-doc:: include/uapi/drm/drm_mode.h
+   :doc: overview
+
+.. _crtc_index:
+
+CRTC index
+----------
+
+CRTC's have both an object ID and an index, and they are not the same thing.
+The index is used in cases where a densely packed identifier for a CRTC is
+needed, for instance a bitmask of CRTC's. The member possible_crtcs of struct
+drm_mode_get_plane is an example.
+
+DRM_IOCTL_MODE_GETRESOURCES populates a structure with an array of CRTC ID's,
+and the CRTC index is its position in this array.
+
+.. kernel-doc:: include/uapi/drm/drm.h
+   :internal:
+
+.. kernel-doc:: include/uapi/drm/drm_mode.h
+   :internal:
diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
new file mode 100644
index 0000000000..044e6b2ed1
--- /dev/null
+++ b/Documentation/gpu/drm-usage-stats.rst
@@ -0,0 +1,171 @@
+.. _drm-client-usage-stats:
+
+======================
+DRM client usage stats
+======================
+
+DRM drivers can choose to export partly standardised text output via the
+`fops->show_fdinfo()` as part of the driver specific file operations registered
+in the `struct drm_driver` object registered with the DRM core.
+
+One purpose of this output is to enable writing as generic as practically
+feasible `top(1)` like userspace monitoring tools.
+
+Given the differences between various DRM drivers the specification of the
+output is split between common and driver specific parts. Having said that,
+wherever possible effort should still be made to standardise as much as
+possible.
+
+File format specification
+=========================
+
+- File shall contain one key value pair per one line of text.
+- Colon character (`:`) must be used to delimit keys and values.
+- All keys shall be prefixed with `drm-`.
+- Whitespace between the delimiter and first non-whitespace character shall be
+  ignored when parsing.
+- Keys are not allowed to contain whitespace characters.
+- Numerical key value pairs can end with optional unit string.
+- Data type of the value is fixed as defined in the specification.
+
+Key types
+---------
+
+1. Mandatory, fully standardised.
+2. Optional, fully standardised.
+3. Driver specific.
+
+Data types
+----------
+
+- <uint> - Unsigned integer without defining the maximum value.
+- <keystr> - String excluding any above defined reserved characters or whitespace.
+- <valstr> - String.
+
+Mandatory fully standardised keys
+---------------------------------
+
+- drm-driver: <valstr>
+
+String shall contain the name this driver registered as via the respective
+`struct drm_driver` data structure.
+
+Optional fully standardised keys
+--------------------------------
+
+Identification
+^^^^^^^^^^^^^^
+
+- drm-pdev: <aaaa:bb.cc.d>
+
+For PCI devices this should contain the PCI slot address of the device in
+question.
+
+- drm-client-id: <uint>
+
+Unique value relating to the open DRM file descriptor used to distinguish
+duplicated and shared file descriptors. Conceptually the value should map 1:1
+to the in kernel representation of `struct drm_file` instances.
+
+Uniqueness of the value shall be either globally unique, or unique within the
+scope of each device, in which case `drm-pdev` shall be present as well.
+
+Userspace should make sure to not double account any usage statistics by using
+the above described criteria in order to associate data to individual clients.
+
+Utilization
+^^^^^^^^^^^
+
+- drm-engine-<keystr>: <uint> ns
+
+GPUs usually contain multiple execution engines. Each shall be given a stable
+and unique name (keystr), with possible values documented in the driver specific
+documentation.
+
+Value shall be in specified time units which the respective GPU engine spent
+busy executing workloads belonging to this client.
+
+Values are not required to be constantly monotonic if it makes the driver
+implementation easier, but are required to catch up with the previously reported
+larger value within a reasonable period. Upon observing a value lower than what
+was previously read, userspace is expected to stay with that larger previous
+value until a monotonic update is seen.
+
+- drm-engine-capacity-<keystr>: <uint>
+
+Engine identifier string must be the same as the one specified in the
+drm-engine-<keystr> tag and shall contain a greater than zero number in case the
+exported engine corresponds to a group of identical hardware engines.
+
+In the absence of this tag parser shall assume capacity of one. Zero capacity
+is not allowed.
+
+- drm-cycles-<keystr>: <uint>
+
+Engine identifier string must be the same as the one specified in the
+drm-engine-<keystr> tag and shall contain the number of busy cycles for the given
+engine.
+
+Values are not required to be constantly monotonic if it makes the driver
+implementation easier, but are required to catch up with the previously reported
+larger value within a reasonable period. Upon observing a value lower than what
+was previously read, userspace is expected to stay with that larger previous
+value until a monotonic update is seen.
+
+- drm-maxfreq-<keystr>: <uint> [Hz|MHz|KHz]
+
+Engine identifier string must be the same as the one specified in the
+drm-engine-<keystr> tag and shall contain the maximum frequency for the given
+engine.  Taken together with drm-cycles-<keystr>, this can be used to calculate
+percentage utilization of the engine, whereas drm-engine-<keystr> only reflects
+time active without considering what frequency the engine is operating as a
+percentage of its maximum frequency.
+
+Memory
+^^^^^^
+
+- drm-memory-<region>: <uint> [KiB|MiB]
+
+Each possible memory type which can be used to store buffer objects by the
+GPU in question shall be given a stable and unique name to be returned as the
+string here.  The name "memory" is reserved to refer to normal system memory.
+
+Value shall reflect the amount of storage currently consumed by the buffer
+objects belong to this client, in the respective memory region.
+
+Default unit shall be bytes with optional unit specifiers of 'KiB' or 'MiB'
+indicating kibi- or mebi-bytes.
+
+- drm-shared-<region>: <uint> [KiB|MiB]
+
+The total size of buffers that are shared with another file (ie. have more
+than a single handle).
+
+- drm-total-<region>: <uint> [KiB|MiB]
+
+The total size of buffers that including shared and private memory.
+
+- drm-resident-<region>: <uint> [KiB|MiB]
+
+The total size of buffers that are resident in the specified region.
+
+- drm-purgeable-<region>: <uint> [KiB|MiB]
+
+The total size of buffers that are purgeable.
+
+- drm-active-<region>: <uint> [KiB|MiB]
+
+The total size of buffers that are active on one or more engines.
+
+Implementation Details
+======================
+
+Drivers should use drm_show_fdinfo() in their `struct file_operations`, and
+implement &drm_driver.show_fdinfo if they wish to provide any stats which
+are not provided by drm_show_fdinfo().  But even driver specific stats should
+be documented above and where possible, aligned with other drivers.
+
+Driver specific implementations
+-------------------------------
+
+:ref:`i915-usage-stats`
diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
new file mode 100644
index 0000000000..378e825754
--- /dev/null
+++ b/Documentation/gpu/i915.rst
@@ -0,0 +1,739 @@
+===========================
+ drm/i915 Intel GFX Driver
+===========================
+
+The drm/i915 driver supports all (with the exception of some very early
+models) integrated GFX chipsets with both Intel display and rendering
+blocks. This excludes a set of SoC platforms with an SGX rendering unit,
+those have basic support through the gma500 drm driver.
+
+Core Driver Infrastructure
+==========================
+
+This section covers core driver infrastructure used by both the display
+and the GEM parts of the driver.
+
+Runtime Power Management
+------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
+   :doc: runtime pm
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_uncore.c
+   :internal:
+
+Interrupt Handling
+------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
+   :doc: interrupt handling
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
+   :functions: intel_irq_init intel_irq_init_hw intel_hpd_init
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
+   :functions: intel_runtime_pm_disable_interrupts
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
+   :functions: intel_runtime_pm_enable_interrupts
+
+Intel GVT-g Guest Support(vGPU)
+-------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
+   :doc: Intel GVT-g guest support
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
+   :internal:
+
+Intel GVT-g Host Support(vGPU device model)
+-------------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
+   :doc: Intel GVT-g host support
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
+   :internal:
+
+Workarounds
+-----------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_workarounds.c
+   :doc: Hardware workarounds
+
+Display Hardware Handling
+=========================
+
+This section covers everything related to the display hardware including
+the mode setting infrastructure, plane, sprite and cursor handling and
+display, output probing and related topics.
+
+Mode Setting Infrastructure
+---------------------------
+
+The i915 driver is thus far the only DRM driver which doesn't use the
+common DRM helper code to implement mode setting sequences. Thus it has
+its own tailor-made infrastructure for executing a display configuration
+change.
+
+Frontbuffer Tracking
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
+   :doc: frontbuffer tracking
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
+   :internal:
+
+Display FIFO Underrun Reporting
+-------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
+   :doc: fifo underrun handling
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
+   :internal:
+
+Plane Configuration
+-------------------
+
+This section covers plane configuration and composition with the primary
+plane, sprites, cursors and overlays. This includes the infrastructure
+to do atomic vsync'ed updates of all this state and also tightly coupled
+topics like watermark setup and computation, framebuffer compression and
+panel self refresh.
+
+Atomic Plane Helpers
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic_plane.c
+   :doc: atomic plane helpers
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic_plane.c
+   :internal:
+
+Asynchronous Page Flip
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_display.c
+   :doc: asynchronous flip implementation
+
+Output Probing
+--------------
+
+This section covers output probing and related infrastructure like the
+hotplug interrupt storm detection and mitigation code. Note that the
+i915 driver still uses most of the common DRM helper code for output
+probing, so those sections fully apply.
+
+Hotplug
+-------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
+   :doc: Hotplug
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
+   :internal:
+
+High Definition Audio
+---------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
+   :doc: High Definition Audio over HDMI and Display Port
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
+   :internal:
+
+.. kernel-doc:: include/drm/i915_component.h
+   :internal:
+
+Intel HDMI LPE Audio Support
+----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
+   :doc: LPE Audio integration for HDMI or DP playback
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
+   :internal:
+
+Panel Self Refresh PSR (PSR/SRD)
+--------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
+   :doc: Panel Self Refresh (PSR/SRD)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
+   :internal:
+
+Frame Buffer Compression (FBC)
+------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
+   :doc: Frame Buffer Compression (FBC)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
+   :internal:
+
+Display Refresh Rate Switching (DRRS)
+-------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
+   :doc: Display Refresh Rate Switching (DRRS)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
+   :internal:
+
+DPIO
+----
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpio_phy.c
+   :doc: DPIO
+
+DMC Firmware Support
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dmc.c
+   :doc: DMC Firmware Support
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dmc.c
+   :internal:
+
+Video BIOS Table (VBT)
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
+   :doc: Video BIOS Table (VBT)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_vbt_defs.h
+   :internal:
+
+Display clocks
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
+   :doc: CDCLK / RAWCLK
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
+   :internal:
+
+Display PLLs
+------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+   :doc: Display PLLs
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+   :internal:
+
+Display State Buffer
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
+   :doc: DSB
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
+   :internal:
+
+GT Programming
+==============
+
+Multicast/Replicated (MCR) Registers
+------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c
+   :doc: GT Multicast/Replicated (MCR) Register Support
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_gt_mcr.c
+   :internal:
+
+Memory Management and Command Submission
+========================================
+
+This sections covers all things related to the GEM implementation in the
+i915 driver.
+
+Intel GPU Basics
+----------------
+
+An Intel GPU has multiple engines. There are several engine types.
+
+- RCS engine is for rendering 3D and performing compute, this is named
+  `I915_EXEC_RENDER` in user space.
+- BCS is a blitting (copy) engine, this is named `I915_EXEC_BLT` in user
+  space.
+- VCS is a video encode and decode engine, this is named `I915_EXEC_BSD`
+  in user space
+- VECS is video enhancement engine, this is named `I915_EXEC_VEBOX` in user
+  space.
+- The enumeration `I915_EXEC_DEFAULT` does not refer to specific engine;
+  instead it is to be used by user space to specify a default rendering
+  engine (for 3D) that may or may not be the same as RCS.
+
+The Intel GPU family is a family of integrated GPU's using Unified
+Memory Access. For having the GPU "do work", user space will feed the
+GPU batch buffers via one of the ioctls `DRM_IOCTL_I915_GEM_EXECBUFFER2`
+or `DRM_IOCTL_I915_GEM_EXECBUFFER2_WR`. Most such batchbuffers will
+instruct the GPU to perform work (for example rendering) and that work
+needs memory from which to read and memory to which to write. All memory
+is encapsulated within GEM buffer objects (usually created with the ioctl
+`DRM_IOCTL_I915_GEM_CREATE`). An ioctl providing a batchbuffer for the GPU
+to create will also list all GEM buffer objects that the batchbuffer reads
+and/or writes. For implementation details of memory management see
+`GEM BO Management Implementation Details`_.
+
+The i915 driver allows user space to create a context via the ioctl
+`DRM_IOCTL_I915_GEM_CONTEXT_CREATE` which is identified by a 32-bit
+integer. Such a context should be viewed by user-space as -loosely-
+analogous to the idea of a CPU process of an operating system. The i915
+driver guarantees that commands issued to a fixed context are to be
+executed so that writes of a previously issued command are seen by
+reads of following commands. Actions issued between different contexts
+(even if from the same file descriptor) are NOT given that guarantee
+and the only way to synchronize across contexts (even from the same
+file descriptor) is through the use of fences. At least as far back as
+Gen4, also have that a context carries with it a GPU HW context;
+the HW context is essentially (most of at least) the state of a GPU.
+In addition to the ordering guarantees, the kernel will restore GPU
+state via HW context when commands are issued to a context, this saves
+user space the need to restore (most of at least) the GPU state at the
+start of each batchbuffer. The non-deprecated ioctls to submit batchbuffer
+work can pass that ID (in the lower bits of drm_i915_gem_execbuffer2::rsvd1)
+to identify what context to use with the command.
+
+The GPU has its own memory management and address space. The kernel
+driver maintains the memory translation table for the GPU. For older
+GPUs (i.e. those before Gen8), there is a single global such translation
+table, a global Graphics Translation Table (GTT). For newer generation
+GPUs each context has its own translation table, called Per-Process
+Graphics Translation Table (PPGTT). Of important note, is that although
+PPGTT is named per-process it is actually per context. When user space
+submits a batchbuffer, the kernel walks the list of GEM buffer objects
+used by the batchbuffer and guarantees that not only is the memory of
+each such GEM buffer object resident but it is also present in the
+(PP)GTT. If the GEM buffer object is not yet placed in the (PP)GTT,
+then it is given an address. Two consequences of this are: the kernel
+needs to edit the batchbuffer submitted to write the correct value of
+the GPU address when a GEM BO is assigned a GPU address and the kernel
+might evict a different GEM BO from the (PP)GTT to make address room
+for another GEM BO. Consequently, the ioctls submitting a batchbuffer
+for execution also include a list of all locations within buffers that
+refer to GPU-addresses so that the kernel can edit the buffer correctly.
+This process is dubbed relocation.
+
+Locking Guidelines
+------------------
+
+.. note::
+   This is a description of how the locking should be after
+   refactoring is done. Does not necessarily reflect what the locking
+   looks like while WIP.
+
+#. All locking rules and interface contracts with cross-driver interfaces
+   (dma-buf, dma_fence) need to be followed.
+
+#. No struct_mutex anywhere in the code
+
+#. dma_resv will be the outermost lock (when needed) and ww_acquire_ctx
+   is to be hoisted at highest level and passed down within i915_gem_ctx
+   in the call chain
+
+#. While holding lru/memory manager (buddy, drm_mm, whatever) locks
+   system memory allocations are not allowed
+
+	* Enforce this by priming lockdep (with fs_reclaim). If we
+	  allocate memory while holding these looks we get a rehash
+	  of the shrinker vs. struct_mutex saga, and that would be
+	  real bad.
+
+#. Do not nest different lru/memory manager locks within each other.
+   Take them in turn to update memory allocations, relying on the object’s
+   dma_resv ww_mutex to serialize against other operations.
+
+#. The suggestion for lru/memory managers locks is that they are small
+   enough to be spinlocks.
+
+#. All features need to come with exhaustive kernel selftests and/or
+   IGT tests when appropriate
+
+#. All LMEM uAPI paths need to be fully restartable (_interruptible()
+   for all locks/waits/sleeps)
+
+	* Error handling validation through signal injection.
+	  Still the best strategy we have for validating GEM uAPI
+          corner cases.
+	  Must be excessively used in the IGT, and we need to check
+	  that we really have full path coverage of all error cases.
+
+	* -EDEADLK handling with ww_mutex
+
+GEM BO Management Implementation Details
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_vma_types.h
+   :doc: Virtual Memory Address
+
+Buffer Object Eviction
+----------------------
+
+This section documents the interface functions for evicting buffer
+objects to make space available in the virtual gpu address spaces. Note
+that this is mostly orthogonal to shrinking buffer objects caches, which
+has the goal to make main memory (shared with the gpu through the
+unified memory architecture) available.
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_evict.c
+   :internal:
+
+Buffer Object Memory Shrinking
+------------------------------
+
+This section documents the interface function for shrinking memory usage
+of buffer object caches. Shrinking is used to make main memory
+available. Note that this is mostly orthogonal to evicting buffer
+objects, which has the goal to make space in gpu virtual address spaces.
+
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
+   :internal:
+
+Batchbuffer Parsing
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
+   :doc: batch buffer command parser
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
+   :internal:
+
+User Batchbuffer Execution
+--------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+   :doc: User command execution
+
+Scheduling
+----------
+.. kernel-doc:: drivers/gpu/drm/i915/i915_scheduler_types.h
+   :functions: i915_sched_engine
+
+Logical Rings, Logical Ring Contexts and Execlists
+--------------------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+   :doc: Logical Rings, Logical Ring Contexts and Execlists
+
+Global GTT views
+----------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_vma_types.h
+   :doc: Global GTT views
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_gtt.c
+   :internal:
+
+GTT Fences and Swizzling
+------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
+   :internal:
+
+Global GTT Fence Handling
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
+   :doc: fence register handling
+
+Hardware Tiling and Swizzling Details
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
+   :doc: tiling swizzling details
+
+Object Tiling IOCTLs
+--------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_tiling.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/gem/i915_gem_tiling.c
+   :doc: buffer object tiling
+
+Protected Objects
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/pxp/intel_pxp.c
+   :doc: PXP
+
+.. kernel-doc:: drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+
+Microcontrollers
+================
+
+Starting from gen9, three microcontrollers are available on the HW: the
+graphics microcontroller (GuC), the HEVC/H.265 microcontroller (HuC) and the
+display microcontroller (DMC). The driver is responsible for loading the
+firmwares on the microcontrollers; the GuC and HuC firmwares are transferred
+to WOPCM using the DMA engine, while the DMC firmware is written through MMIO.
+
+WOPCM
+-----
+
+WOPCM Layout
+~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/intel_wopcm.c
+   :doc: WOPCM Layout
+
+GuC
+---
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
+   :doc: GuC
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.h
+
+GuC Firmware Layout
+~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h
+   :doc: Firmware Layout
+
+GuC Memory Management
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
+   :doc: GuC Memory Management
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc.c
+   :functions: intel_guc_allocate_vma
+
+
+GuC-specific firmware loader
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
+   :internal:
+
+GuC-based command submission
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+   :doc: GuC-based command submission
+
+GuC ABI
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_messages_abi.h
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_communication_mmio_abi.h
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h
+
+HuC
+---
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
+   :doc: HuC
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
+   :functions: intel_huc_auth
+
+HuC Memory Management
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/i915/gt/uc/intel_huc.c
+   :doc: HuC Memory Management
+
+HuC Firmware Layout
+~~~~~~~~~~~~~~~~~~~
+The HuC FW layout is the same as the GuC one, see `GuC Firmware Layout`_
+
+DMC
+---
+See `DMC Firmware Support`_
+
+Tracing
+=======
+
+This sections covers all things related to the tracepoints implemented
+in the i915 driver.
+
+i915_ppgtt_create and i915_ppgtt_release
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
+   :doc: i915_ppgtt_create and i915_ppgtt_release tracepoints
+
+i915_context_create and i915_context_free
+-----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
+   :doc: i915_context_create and i915_context_free tracepoints
+
+Perf
+====
+
+Overview
+--------
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :doc: i915 Perf Overview
+
+Comparison with Core Perf
+-------------------------
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :doc: i915 Perf History and Comparison with Core Perf
+
+i915 Driver Entry Points
+------------------------
+
+This section covers the entrypoints exported outside of i915_perf.c to
+integrate with drm/i915 and to handle the `DRM_I915_PERF_OPEN` ioctl.
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_init
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_fini
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_register
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_unregister
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_open_ioctl
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_release
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_add_config_ioctl
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_remove_config_ioctl
+
+i915 Perf Stream
+----------------
+
+This section covers the stream-semantics-agnostic structures and functions
+for representing an i915 perf stream FD and associated file operations.
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
+   :functions: i915_perf_stream
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
+   :functions: i915_perf_stream_ops
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: read_properties_unlocked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_open_ioctl_locked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_destroy_locked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_read
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_ioctl
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_enable_locked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_disable_locked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_poll
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_perf_poll_locked
+
+i915 Perf Observation Architecture Stream
+-----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf_types.h
+   :functions: i915_oa_ops
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_stream_init
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_read
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_stream_enable
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_stream_disable
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_wait_unlocked
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :functions: i915_oa_poll_wait
+
+Other i915 Perf Internals
+-------------------------
+
+This section simply includes all other currently documented i915 perf internals,
+in no particular order, but may include some more minor utilities or platform
+specific details than found in the more high-level sections.
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
+   :internal:
+   :no-identifiers:
+       i915_perf_init
+       i915_perf_fini
+       i915_perf_register
+       i915_perf_unregister
+       i915_perf_open_ioctl
+       i915_perf_release
+       i915_perf_add_config_ioctl
+       i915_perf_remove_config_ioctl
+       read_properties_unlocked
+       i915_perf_open_ioctl_locked
+       i915_perf_destroy_locked
+       i915_perf_read i915_perf_ioctl
+       i915_perf_enable_locked
+       i915_perf_disable_locked
+       i915_perf_poll i915_perf_poll_locked
+       i915_oa_stream_init i915_oa_read
+       i915_oa_stream_enable
+       i915_oa_stream_disable
+       i915_oa_wait_unlocked
+       i915_oa_poll_wait
+
+Style
+=====
+
+The drm/i915 driver codebase has some style rules in addition to (and, in some
+cases, deviating from) the kernel coding style.
+
+Register macro definition style
+-------------------------------
+
+The style guide for ``i915_reg.h``.
+
+.. kernel-doc:: drivers/gpu/drm/i915/i915_reg.h
+   :doc: The i915 register macro definition style guide
+
+.. _i915-usage-stats:
+
+i915 DRM client usage stats implementation
+==========================================
+
+The drm/i915 driver implements the DRM client usage stats specification as
+documented in :ref:`drm-client-usage-stats`.
+
+Example of the output showing the implemented key value pairs and entirety of
+the currently possible format options:
+
+::
+
+      pos:    0
+      flags:  0100002
+      mnt_id: 21
+      drm-driver: i915
+      drm-pdev:   0000:00:02.0
+      drm-client-id:      7
+      drm-engine-render:  9288864723 ns
+      drm-engine-copy:    2035071108 ns
+      drm-engine-video:   0 ns
+      drm-engine-capacity-video:   2
+      drm-engine-video-enhance:   0 ns
+
+Possible `drm-engine-` key names are: `render`, `copy`, `video` and
+`video-enhance`.
diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
new file mode 100644
index 0000000000..e45ff09152
--- /dev/null
+++ b/Documentation/gpu/index.rst
@@ -0,0 +1,29 @@
+============================
+GPU Driver Developer's Guide
+============================
+
+.. toctree::
+
+   introduction
+   drm-internals
+   drm-mm
+   drm-kms
+   drm-kms-helpers
+   drm-uapi
+   drm-usage-stats
+   driver-uapi
+   drm-client
+   drivers
+   backlight
+   vga-switcheroo
+   vgaarbiter
+   automated_testing
+   todo
+   rfc/index
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`
diff --git a/Documentation/gpu/introduction.rst b/Documentation/gpu/introduction.rst
new file mode 100644
index 0000000000..f05eccd2c0
--- /dev/null
+++ b/Documentation/gpu/introduction.rst
@@ -0,0 +1,174 @@
+============
+Introduction
+============
+
+The Linux DRM layer contains code intended to support the needs of
+complex graphics devices, usually containing programmable pipelines well
+suited to 3D graphics acceleration. Graphics drivers in the kernel may
+make use of DRM functions to make tasks like memory management,
+interrupt handling and DMA easier, and provide a uniform interface to
+applications.
+
+A note on versions: this guide covers features found in the DRM tree,
+including the TTM memory manager, output configuration and mode setting,
+and the new vblank internals, in addition to all the regular features
+found in current kernels.
+
+[Insert diagram of typical DRM stack here]
+
+Style Guidelines
+================
+
+For consistency this documentation uses American English. Abbreviations
+are written as all-uppercase, for example: DRM, KMS, IOCTL, CRTC, and so
+on. To aid in reading, documentations make full use of the markup
+characters kerneldoc provides: @parameter for function parameters,
+@member for structure members (within the same structure), &struct structure to
+reference structures and function() for functions. These all get automatically
+hyperlinked if kerneldoc for the referenced objects exists. When referencing
+entries in function vtables (and structure members in general) please use
+&vtable_name.vfunc. Unfortunately this does not yet yield a direct link to the
+member, only the structure.
+
+Except in special situations (to separate locked from unlocked variants)
+locking requirements for functions aren't documented in the kerneldoc.
+Instead locking should be check at runtime using e.g.
+``WARN_ON(!mutex_is_locked(...));``. Since it's much easier to ignore
+documentation than runtime noise this provides more value. And on top of
+that runtime checks do need to be updated when the locking rules change,
+increasing the chances that they're correct. Within the documentation
+the locking rules should be explained in the relevant structures: Either
+in the comment for the lock explaining what it protects, or data fields
+need a note about which lock protects them, or both.
+
+Functions which have a non-\ ``void`` return value should have a section
+called "Returns" explaining the expected return values in different
+cases and their meanings. Currently there's no consensus whether that
+section name should be all upper-case or not, and whether it should end
+in a colon or not. Go with the file-local style. Other common section
+names are "Notes" with information for dangerous or tricky corner cases,
+and "FIXME" where the interface could be cleaned up.
+
+Also read the :ref:`guidelines for the kernel documentation at large <doc_guide>`.
+
+Documentation Requirements for kAPI
+-----------------------------------
+
+All kernel APIs exported to other modules must be documented, including their
+datastructures and at least a short introductory section explaining the overall
+concepts. Documentation should be put into the code itself as kerneldoc comments
+as much as reasonable.
+
+Do not blindly document everything, but document only what's relevant for driver
+authors: Internal functions of drm.ko and definitely static functions should not
+have formal kerneldoc comments. Use normal C comments if you feel like a comment
+is warranted. You may use kerneldoc syntax in the comment, but it shall not
+start with a /** kerneldoc marker. Similar for data structures, annotate
+anything entirely private with ``/* private: */`` comments as per the
+documentation guide.
+
+Getting Started
+===============
+
+Developers interested in helping out with the DRM subsystem are very welcome.
+Often people will resort to sending in patches for various issues reported by
+checkpatch or sparse. We welcome such contributions.
+
+Anyone looking to kick it up a notch can find a list of janitorial tasks on
+the :ref:`TODO list <todo>`.
+
+Contribution Process
+====================
+
+Mostly the DRM subsystem works like any other kernel subsystem, see :ref:`the
+main process guidelines and documentation <process_index>` for how things work.
+Here we just document some of the specialities of the GPU subsystem.
+
+Feature Merge Deadlines
+-----------------------
+
+All feature work must be in the linux-next tree by the -rc6 release of the
+current release cycle, otherwise they must be postponed and can't reach the next
+merge window. All patches must have landed in the drm-next tree by latest -rc7,
+but if your branch is not in linux-next then this must have happened by -rc6
+already.
+
+After that point only bugfixes (like after the upstream merge window has closed
+with the -rc1 release) are allowed. No new platform enabling or new drivers are
+allowed.
+
+This means that there's a blackout-period of about one month where feature work
+can't be merged. The recommended way to deal with that is having a -next tree
+that's always open, but making sure to not feed it into linux-next during the
+blackout period. As an example, drm-misc works like that.
+
+Code of Conduct
+---------------
+
+As a freedesktop.org project, dri-devel, and the DRM community, follows the
+Contributor Covenant, found at: https://www.freedesktop.org/wiki/CodeOfConduct
+
+Please conduct yourself in a respectful and civilised manner when
+interacting with community members on mailing lists, IRC, or bug
+trackers. The community represents the project as a whole, and abusive
+or bullying behaviour is not tolerated by the project.
+
+Simple DRM drivers to use as examples
+=====================================
+
+The DRM subsystem contains a lot of helper functions to ease writing drivers for
+simple graphic devices. For example, the `drivers/gpu/drm/tiny/` directory has a
+set of drivers that are simple enough to be implemented in a single source file.
+
+These drivers make use of the `struct drm_simple_display_pipe_funcs`, that hides
+any complexity of the DRM subsystem and just requires drivers to implement a few
+functions needed to operate the device. This could be used for devices that just
+need a display pipeline with one full-screen scanout buffer feeding one output.
+
+The tiny DRM drivers are good examples to understand how DRM drivers should look
+like. Since are just a few hundreds lines of code, they are quite easy to read.
+
+External References
+===================
+
+Delving into a Linux kernel subsystem for the first time can be an overwhelming
+experience, one needs to get familiar with all the concepts and learn about the
+subsystem's internals, among other details.
+
+To shallow the learning curve, this section contains a list of presentations
+and documents that can be used to learn about DRM/KMS and graphics in general.
+
+There are different reasons why someone might want to get into DRM: porting an
+existing fbdev driver, write a DRM driver for a new hardware, fixing bugs that
+could face when working on the graphics user-space stack, etc. For this reason,
+the learning material covers many aspects of the Linux graphics stack. From an
+overview of the kernel and user-space stacks to very specific topics.
+
+The list is sorted in reverse chronological order, to keep the most up-to-date
+material at the top. But all of them contain useful information, and it can be
+valuable to go through older material to understand the rationale and context
+in which the changes to the DRM subsystem were made.
+
+Conference talks
+----------------
+
+* `An Overview of the Linux and Userspace Graphics Stack <https://www.youtube.com/watch?v=wjAJmqwg47k>`_ - Paul Kocialkowski (2020)
+* `Getting pixels on screen on Linux: introduction to Kernel Mode Setting <https://www.youtube.com/watch?v=haes4_Xnc5Q>`_ - Simon Ser (2020)
+* `Everything Great about Upstream Graphics <https://www.youtube.com/watch?v=kVzHOgt6WGE>`_ - Daniel Vetter (2019)
+* `An introduction to the Linux DRM subsystem <https://www.youtube.com/watch?v=LbDOCJcDRoo>`_ - Maxime Ripard (2017)
+* `Embrace the Atomic (Display) Age <https://www.youtube.com/watch?v=LjiB_JeDn2M>`_ - Daniel Vetter (2016)
+* `Anatomy of an Atomic KMS Driver <https://www.youtube.com/watch?v=lihqR9sENpc>`_ - Laurent Pinchart (2015)
+* `Atomic Modesetting for Drivers <https://www.youtube.com/watch?v=kl9suFgbTc8>`_ - Daniel Vetter (2015)
+* `Anatomy of an Embedded KMS Driver <https://www.youtube.com/watch?v=Ja8fM7rTae4>`_ - Laurent Pinchart (2013)
+
+Slides and articles
+-------------------
+
+* `Understanding the Linux Graphics Stack <https://bootlin.com/doc/training/graphics/graphics-slides.pdf>`_ - Bootlin (2022)
+* `DRM KMS overview <https://wiki.st.com/stm32mpu/wiki/DRM_KMS_overview>`_ - STMicroelectronics (2021)
+* `Linux graphic stack <https://studiopixl.com/2017-05-13/linux-graphic-stack-an-overview>`_ - Nathan Gauër (2017)
+* `Atomic mode setting design overview, part 1 <https://lwn.net/Articles/653071/>`_ - Daniel Vetter (2015)
+* `Atomic mode setting design overview, part 2 <https://lwn.net/Articles/653466/>`_ - Daniel Vetter (2015)
+* `The DRM/KMS subsystem from a newbie’s point of view <https://bootlin.com/pub/conferences/2014/elce/brezillon-drm-kms/brezillon-drm-kms.pdf>`_ - Boris Brezillon (2014)
+* `A brief introduction to the Linux graphics stack <https://blogs.igalia.com/itoral/2014/07/29/a-brief-introduction-to-the-linux-graphics-stack/>`_ - Iago Toral (2014)
+* `The Linux Graphics Stack <https://blog.mecheye.net/2012/06/the-linux-graphics-stack/>`_ - Jasper St. Pierre (2012)
diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv
new file mode 100644
index 0000000000..0f95908348
--- /dev/null
+++ b/Documentation/gpu/kms-properties.csv
@@ -0,0 +1,101 @@
+Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,Description/Restrictions
+,DVI-I,“subconnector”,ENUM,"{ “Unknown”, “DVI-D”, “DVI-A” }",Connector,TBD
+,,“select subconnector”,ENUM,"{ “Automatic”, “DVI-D”, “DVI-A” }",Connector,TBD
+,TV,“subconnector”,ENUM,"{ ""Unknown"", ""Composite"", ""SVIDEO"", ""Component"", ""SCART"" }",Connector,TBD
+,,“select subconnector”,ENUM,"{ ""Automatic"", ""Composite"", ""SVIDEO"", ""Component"", ""SCART"" }",Connector,TBD
+,,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD
+,,“left margin”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“right margin”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“top margin”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“bottom margin”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“brightness”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“contrast”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“flicker reduction”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“overscan”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“saturation”,RANGE,"Min=0, Max=100",Connector,TBD
+,,“hue”,RANGE,"Min=0, Max=100",Connector,TBD
+,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector
+,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector
+,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB
+i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normally in the range 0..1.0 are remapped to the range 16/255..235/255."
+,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD
+,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD
+,,"""left_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""right_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""top_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""bottom_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“hpos”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“vpos”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“contrast”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“saturation”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“hue”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“sharpness”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter_adaptive”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter_2d”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“tv_chroma_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“tv_luma_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“dot_crawl”,RANGE,"Min=0, Max=1",Connector,TBD
+,SDVO-TV/LVDS,“brightness”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+CDV gma-500,Generic,"""Broadcast RGB""",ENUM,"{ “Full”, “Limited 16:235” }",Connector,TBD
+,,"""Broadcast RGB""",ENUM,"{ “off”, “auto”, “on” }",Connector,TBD
+Poulsbo,Generic,“backlight”,RANGE,"Min=0, Max=100",Connector,TBD
+,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD
+,,"""left_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""right_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""top_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,"""bottom_margin""",RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“hpos”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“vpos”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“contrast”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“saturation”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“hue”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“sharpness”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter_adaptive”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“flicker_filter_2d”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“tv_chroma_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“tv_luma_filter”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+,,“dot_crawl”,RANGE,"Min=0, Max=1",Connector,TBD
+,SDVO-TV/LVDS,“brightness”,RANGE,"Min=0, Max= SDVO dependent",Connector,TBD
+armada,CRTC,"""CSC_YUV""",ENUM,"{ ""Auto"" , ""CCIR601"", ""CCIR709"" }",CRTC,TBD
+,,"""CSC_RGB""",ENUM,"{ ""Auto"", ""Computer system"", ""Studio"" }",CRTC,TBD
+,Overlay,"""colorkey""",RANGE,"Min=0, Max=0xffffff",Plane,TBD
+,,"""colorkey_min""",RANGE,"Min=0, Max=0xffffff",Plane,TBD
+,,"""colorkey_max""",RANGE,"Min=0, Max=0xffffff",Plane,TBD
+,,"""colorkey_val""",RANGE,"Min=0, Max=0xffffff",Plane,TBD
+,,"""colorkey_alpha""",RANGE,"Min=0, Max=0xffffff",Plane,TBD
+,,"""colorkey_mode""",ENUM,"{ ""disabled"", ""Y component"", ""U component"" , ""V component"", ""RGB"", “R component"", ""G component"", ""B component"" }",Plane,TBD
+,,"""brightness""",RANGE,"Min=0, Max=256 + 255",Plane,TBD
+,,"""contrast""",RANGE,"Min=0, Max=0x7fff",Plane,TBD
+,,"""saturation""",RANGE,"Min=0, Max=0x7fff",Plane,TBD
+exynos,CRTC,“mode”,ENUM,"{ ""normal"", ""blank"" }",CRTC,TBD
+i2c/ch7006_drv,Generic,“scale”,RANGE,"Min=0, Max=2",Connector,TBD
+,TV,“mode”,ENUM,"{ ""PAL"", ""PAL-M"",""PAL-N""}, ”PAL-Nc"" , ""PAL-60"", ""NTSC-M"", ""NTSC-J"" }",Connector,TBD
+nouveau,NV10 Overlay,"""colorkey""",RANGE,"Min=0, Max=0x01ffffff",Plane,TBD
+,,“contrast”,RANGE,"Min=0, Max=8192-1",Plane,TBD
+,,“brightness”,RANGE,"Min=0, Max=1024",Plane,TBD
+,,“hue”,RANGE,"Min=0, Max=359",Plane,TBD
+,,“saturation”,RANGE,"Min=0, Max=8192-1",Plane,TBD
+,,“iturbt_709”,RANGE,"Min=0, Max=1",Plane,TBD
+,Nv04 Overlay,“colorkey”,RANGE,"Min=0, Max=0x01ffffff",Plane,TBD
+,,“brightness”,RANGE,"Min=0, Max=1024",Plane,TBD
+,Display,“dithering mode”,ENUM,"{ ""auto"", ""off"", ""on"" }",Connector,TBD
+,,“dithering depth”,ENUM,"{ ""auto"", ""off"", ""on"", ""static 2x2"", ""dynamic 2x2"", ""temporal"" }",Connector,TBD
+,,“underscan”,ENUM,"{ ""auto"", ""6 bpc"", ""8 bpc"" }",Connector,TBD
+,,“underscan hborder”,RANGE,"Min=0, Max=128",Connector,TBD
+,,“underscan vborder”,RANGE,"Min=0, Max=128",Connector,TBD
+,,“vibrant hue”,RANGE,"Min=0, Max=180",Connector,TBD
+,,“color vibrance”,RANGE,"Min=0, Max=200",Connector,TBD
+omap,Generic,“zorder”,RANGE,"Min=0, Max=3","CRTC, Plane",TBD
+qxl,Generic,"“hotplug_mode_update""",RANGE,"Min=0, Max=1",Connector,TBD
+radeon,DVI-I,“coherent”,RANGE,"Min=0, Max=1",Connector,TBD
+,DAC enable load detect,“load detection”,RANGE,"Min=0, Max=1",Connector,TBD
+,TV Standard,"""tv standard""",ENUM,"{ ""ntsc"", ""pal"", ""pal-m"", ""pal-60"", ""ntsc-j"" , ""scart-pal"", ""pal-cn"", ""secam"" }",Connector,TBD
+,legacy TMDS PLL detect,"""tmds_pll""",ENUM,"{ ""driver"", ""bios"" }",-,TBD
+,Underscan,"""underscan""",ENUM,"{ ""off"", ""on"", ""auto"" }",Connector,TBD
+,,"""underscan hborder""",RANGE,"Min=0, Max=128",Connector,TBD
+,,"""underscan vborder""",RANGE,"Min=0, Max=128",Connector,TBD
+,Audio,“audio”,ENUM,"{ ""off"", ""on"", ""auto"" }",Connector,TBD
+,FMT Dithering,“dither”,ENUM,"{ ""off"", ""on"" }",Connector,TBD
+,,"""colorkey""",RANGE,"Min=0, Max=0x01ffffff",Plane,TBD
diff --git a/Documentation/gpu/komeda-kms.rst b/Documentation/gpu/komeda-kms.rst
new file mode 100644
index 0000000000..633a016563
--- /dev/null
+++ b/Documentation/gpu/komeda-kms.rst
@@ -0,0 +1,488 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+ drm/komeda Arm display driver
+==============================
+
+The drm/komeda driver supports the Arm display processor D71 and later products,
+this document gives a brief overview of driver design: how it works and why
+design it like that.
+
+Overview of D71 like display IPs
+================================
+
+From D71, Arm display IP begins to adopt a flexible and modularized
+architecture. A display pipeline is made up of multiple individual and
+functional pipeline stages called components, and every component has some
+specific capabilities that can give the flowed pipeline pixel data a
+particular processing.
+
+Typical D71 components:
+
+Layer
+-----
+Layer is the first pipeline stage, which prepares the pixel data for the next
+stage. It fetches the pixel from memory, decodes it if it's AFBC, rotates the
+source image, unpacks or converts YUV pixels to the device internal RGB pixels,
+then adjusts the color_space of pixels if needed.
+
+Scaler
+------
+As its name suggests, scaler takes responsibility for scaling, and D71 also
+supports image enhancements by scaler.
+The usage of scaler is very flexible and can be connected to layer output
+for layer scaling, or connected to compositor and scale the whole display
+frame and then feed the output data into wb_layer which will then write it
+into memory.
+
+Compositor (compiz)
+-------------------
+Compositor blends multiple layers or pixel data flows into one single display
+frame. its output frame can be fed into post image processor for showing it on
+the monitor or fed into wb_layer and written to memory at the same time.
+user can also insert a scaler between compositor and wb_layer to down scale
+the display frame first and then write to memory.
+
+Writeback Layer (wb_layer)
+--------------------------
+Writeback layer does the opposite things of Layer, which connects to compiz
+and writes the composition result to memory.
+
+Post image processor (improc)
+-----------------------------
+Post image processor adjusts frame data like gamma and color space to fit the
+requirements of the monitor.
+
+Timing controller (timing_ctrlr)
+--------------------------------
+Final stage of display pipeline, Timing controller is not for the pixel
+handling, but only for controlling the display timing.
+
+Merger
+------
+D71 scaler mostly only has the half horizontal input/output capabilities
+compared with Layer, like if Layer supports 4K input size, the scaler only can
+support 2K input/output in the same time. To achieve the ful frame scaling, D71
+introduces Layer Split, which splits the whole image to two half parts and feeds
+them to two Layers A and B, and does the scaling independently. After scaling
+the result need to be fed to merger to merge two part images together, and then
+output merged result to compiz.
+
+Splitter
+--------
+Similar to Layer Split, but Splitter is used for writeback, which splits the
+compiz result to two parts and then feed them to two scalers.
+
+Possible D71 Pipeline usage
+===========================
+
+Benefitting from the modularized architecture, D71 pipelines can be easily
+adjusted to fit different usages. And D71 has two pipelines, which support two
+types of working mode:
+
+-   Dual display mode
+    Two pipelines work independently and separately to drive two display outputs.
+
+-   Single display mode
+    Two pipelines work together to drive only one display output.
+
+    On this mode, pipeline_B doesn't work indenpendently, but outputs its
+    composition result into pipeline_A, and its pixel timing also derived from
+    pipeline_A.timing_ctrlr. The pipeline_B works just like a "slave" of
+    pipeline_A(master)
+
+Single pipeline data flow
+-------------------------
+
+.. kernel-render:: DOT
+   :alt: Single pipeline digraph
+   :caption: Single pipeline data flow
+
+   digraph single_ppl {
+      rankdir=LR;
+
+      subgraph {
+         "Memory";
+         "Monitor";
+      }
+
+      subgraph cluster_pipeline {
+          style=dashed
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Scaler-0";
+              "Scaler-1";
+              "Scaler-0/1"
+          }
+
+         node [bgcolor=grey style=filled]
+         "Layer-0" -> "Scaler-0"
+         "Layer-1" -> "Scaler-0"
+         "Layer-2" -> "Scaler-1"
+         "Layer-3" -> "Scaler-1"
+
+         "Layer-0" -> "Compiz"
+         "Layer-1" -> "Compiz"
+         "Layer-2" -> "Compiz"
+         "Layer-3" -> "Compiz"
+         "Scaler-0" -> "Compiz"
+         "Scaler-1" -> "Compiz"
+
+         "Compiz" -> "Scaler-0/1" -> "Wb_layer"
+         "Compiz" -> "Improc" -> "Timing Controller"
+      }
+
+      "Wb_layer" -> "Memory"
+      "Timing Controller" -> "Monitor"
+   }
+
+Dual pipeline with Slave enabled
+--------------------------------
+
+.. kernel-render:: DOT
+   :alt: Slave pipeline digraph
+   :caption: Slave pipeline enabled data flow
+
+   digraph slave_ppl {
+      rankdir=LR;
+
+      subgraph {
+         "Memory";
+         "Monitor";
+      }
+      node [shape=box]
+      subgraph cluster_pipeline_slave {
+          style=dashed
+          label="Slave Pipeline_B"
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Slave.Scaler-0";
+              "Slave.Scaler-1";
+          }
+
+         node [bgcolor=grey style=filled]
+         "Slave.Layer-0" -> "Slave.Scaler-0"
+         "Slave.Layer-1" -> "Slave.Scaler-0"
+         "Slave.Layer-2" -> "Slave.Scaler-1"
+         "Slave.Layer-3" -> "Slave.Scaler-1"
+
+         "Slave.Layer-0" -> "Slave.Compiz"
+         "Slave.Layer-1" -> "Slave.Compiz"
+         "Slave.Layer-2" -> "Slave.Compiz"
+         "Slave.Layer-3" -> "Slave.Compiz"
+         "Slave.Scaler-0" -> "Slave.Compiz"
+         "Slave.Scaler-1" -> "Slave.Compiz"
+      }
+
+      subgraph cluster_pipeline_master {
+          style=dashed
+          label="Master Pipeline_A"
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Scaler-0";
+              "Scaler-1";
+              "Scaler-0/1"
+          }
+
+         node [bgcolor=grey style=filled]
+         "Layer-0" -> "Scaler-0"
+         "Layer-1" -> "Scaler-0"
+         "Layer-2" -> "Scaler-1"
+         "Layer-3" -> "Scaler-1"
+
+         "Slave.Compiz" -> "Compiz"
+         "Layer-0" -> "Compiz"
+         "Layer-1" -> "Compiz"
+         "Layer-2" -> "Compiz"
+         "Layer-3" -> "Compiz"
+         "Scaler-0" -> "Compiz"
+         "Scaler-1" -> "Compiz"
+
+         "Compiz" -> "Scaler-0/1" -> "Wb_layer"
+         "Compiz" -> "Improc" -> "Timing Controller"
+      }
+
+      "Wb_layer" -> "Memory"
+      "Timing Controller" -> "Monitor"
+   }
+
+Sub-pipelines for input and output
+----------------------------------
+
+A complete display pipeline can be easily divided into three sub-pipelines
+according to the in/out usage.
+
+Layer(input) pipeline
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-render:: DOT
+   :alt: Layer data digraph
+   :caption: Layer (input) data flow
+
+   digraph layer_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      {
+         node [bgcolor=grey style=dashed]
+           "Scaler-n";
+      }
+
+      "Layer-n" -> "Scaler-n" -> "Compiz"
+   }
+
+.. kernel-render:: DOT
+   :alt: Layer Split digraph
+   :caption: Layer Split pipeline
+
+   digraph layer_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      "Layer-0/1" -> "Scaler-0" -> "Merger"
+      "Layer-2/3" -> "Scaler-1" -> "Merger"
+      "Merger" -> "Compiz"
+   }
+
+Writeback(output) pipeline
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. kernel-render:: DOT
+   :alt: writeback digraph
+   :caption: Writeback(output) data flow
+
+   digraph writeback_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      {
+         node [bgcolor=grey style=dashed]
+           "Scaler-n";
+      }
+
+      "Compiz" -> "Scaler-n" -> "Wb_layer"
+   }
+
+.. kernel-render:: DOT
+   :alt: split writeback digraph
+   :caption: Writeback(output) Split data flow
+
+   digraph writeback_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      "Compiz" -> "Splitter"
+      "Splitter" -> "Scaler-0" -> "Merger"
+      "Splitter" -> "Scaler-1" -> "Merger"
+      "Merger" -> "Wb_layer"
+   }
+
+Display output pipeline
+~~~~~~~~~~~~~~~~~~~~~~~
+.. kernel-render:: DOT
+   :alt: display digraph
+   :caption: display output data flow
+
+   digraph single_ppl {
+      rankdir=LR;
+      node [shape=box]
+
+      "Compiz" -> "Improc" -> "Timing Controller"
+   }
+
+In the following section we'll see these three sub-pipelines will be handled
+by KMS-plane/wb_conn/crtc respectively.
+
+Komeda Resource abstraction
+===========================
+
+struct komeda_pipeline/component
+--------------------------------
+
+To fully utilize and easily access/configure the HW, the driver side also uses
+a similar architecture: Pipeline/Component to describe the HW features and
+capabilities, and a specific component includes two parts:
+
+-  Data flow controlling.
+-  Specific component capabilities and features.
+
+So the driver defines a common header struct komeda_component to describe the
+data flow control and all specific components are a subclass of this base
+structure.
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+   :internal:
+
+Resource discovery and initialization
+=====================================
+
+Pipeline and component are used to describe how to handle the pixel data. We
+still need a @struct komeda_dev to describe the whole view of the device, and
+the control-abilites of device.
+
+We have &komeda_dev, &komeda_pipeline, &komeda_component. Now fill devices with
+pipelines. Since komeda is not for D71 only but also intended for later products,
+of course we’d better share as much as possible between different products. To
+achieve this, split the komeda device into two layers: CORE and CHIP.
+
+-   CORE: for common features and capabilities handling.
+-   CHIP: for register programming and HW specific feature (limitation) handling.
+
+CORE can access CHIP by three chip function structures:
+
+-   struct komeda_dev_funcs
+-   struct komeda_pipeline_funcs
+-   struct komeda_component_funcs
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_dev.h
+   :internal:
+
+Format handling
+===============
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
+   :internal:
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
+   :internal:
+
+Attach komeda_dev to DRM-KMS
+============================
+
+Komeda abstracts resources by pipeline/component, but DRM-KMS uses
+crtc/plane/connector. One KMS-obj cannot represent only one single component,
+since the requirements of a single KMS object cannot simply be achieved by a
+single component, usually that needs multiple components to fit the requirement.
+Like set mode, gamma, ctm for KMS all target on CRTC-obj, but komeda needs
+compiz, improc and timing_ctrlr to work together to fit these requirements.
+And a KMS-Plane may require multiple komeda resources: layer/scaler/compiz.
+
+So, one KMS-Obj represents a sub-pipeline of komeda resources.
+
+-   Plane: `Layer(input) pipeline`_
+-   Wb_connector: `Writeback(output) pipeline`_
+-   Crtc: `Display output pipeline`_
+
+So, for komeda, we treat KMS crtc/plane/connector as users of pipeline and
+component, and at any one time a pipeline/component only can be used by one
+user. And pipeline/component will be treated as private object of DRM-KMS; the
+state will be managed by drm_atomic_state as well.
+
+How to map plane to Layer(input) pipeline
+-----------------------------------------
+
+Komeda has multiple Layer input pipelines, see:
+-   `Single pipeline data flow`_
+-   `Dual pipeline with Slave enabled`_
+
+The easiest way is binding a plane to a fixed Layer pipeline, but consider the
+komeda capabilities:
+
+-   Layer Split, See `Layer(input) pipeline`_
+
+    Layer_Split is quite complicated feature, which splits a big image into two
+    parts and handles it by two layers and two scalers individually. But it
+    imports an edge problem or effect in the middle of the image after the split.
+    To avoid such a problem, it needs a complicated Split calculation and some
+    special configurations to the layer and scaler. We'd better hide such HW
+    related complexity to user mode.
+
+-   Slave pipeline, See `Dual pipeline with Slave enabled`_
+
+    Since the compiz component doesn't output alpha value, the slave pipeline
+    only can be used for bottom layers composition. The komeda driver wants to
+    hide this limitation to the user. The way to do this is to pick a suitable
+    Layer according to plane_state->zpos.
+
+So for komeda, the KMS-plane doesn't represent a fixed komeda layer pipeline,
+but multiple Layers with same capabilities. Komeda will select one or more
+Layers to fit the requirement of one KMS-plane.
+
+Make component/pipeline to be drm_private_obj
+---------------------------------------------
+
+Add :c:type:`drm_private_obj` to :c:type:`komeda_component`, :c:type:`komeda_pipeline`
+
+.. code-block:: c
+
+    struct komeda_component {
+        struct drm_private_obj obj;
+        ...
+    }
+
+    struct komeda_pipeline {
+        struct drm_private_obj obj;
+        ...
+    }
+
+Tracking component_state/pipeline_state by drm_atomic_state
+-----------------------------------------------------------
+
+Add :c:type:`drm_private_state` and user to :c:type:`komeda_component_state`,
+:c:type:`komeda_pipeline_state`
+
+.. code-block:: c
+
+    struct komeda_component_state {
+        struct drm_private_state obj;
+        void *binding_user;
+        ...
+    }
+
+    struct komeda_pipeline_state {
+        struct drm_private_state obj;
+        struct drm_crtc *crtc;
+        ...
+    }
+
+komeda component validation
+---------------------------
+
+Komeda has multiple types of components, but the process of validation are
+similar, usually including the following steps:
+
+.. code-block:: c
+
+    int komeda_xxxx_validate(struct komeda_component_xxx xxx_comp,
+                struct komeda_component_output *input_dflow,
+                struct drm_plane/crtc/connector *user,
+                struct drm_plane/crtc/connector_state, *user_state)
+    {
+         setup 1: check if component is needed, like the scaler is optional depending
+                  on the user_state; if unneeded, just return, and the caller will
+                  put the data flow into next stage.
+         Setup 2: check user_state with component features and capabilities to see
+                  if requirements can be met; if not, return fail.
+         Setup 3: get component_state from drm_atomic_state, and try set to set
+                  user to component; fail if component has been assigned to another
+                  user already.
+         Setup 3: configure the component_state, like set its input component,
+                  convert user_state to component specific state.
+         Setup 4: adjust the input_dflow and prepare it for the next stage.
+    }
+
+komeda_kms Abstraction
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+   :internal:
+
+komde_kms Functions
+-------------------
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+   :internal:
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+   :internal:
+
+Build komeda to be a Linux module driver
+========================================
+
+Now we have two level devices:
+
+-   komeda_dev: describes the real display hardware.
+-   komeda_kms_dev: attaches or connects komeda_dev to DRM-KMS.
+
+All komeda operations are supplied or operated by komeda_dev or komeda_kms_dev,
+the module driver is only a simple wrapper to pass the Linux command
+(probe/remove/pm) into komeda_dev or komeda_kms_dev.
diff --git a/Documentation/gpu/mcde.rst b/Documentation/gpu/mcde.rst
new file mode 100644
index 0000000000..dd43dde379
--- /dev/null
+++ b/Documentation/gpu/mcde.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=======================================================
+ drm/mcde ST-Ericsson MCDE Multi-channel display engine
+=======================================================
+
+.. kernel-doc:: drivers/gpu/drm/mcde/mcde_drv.c
+   :doc: ST-Ericsson MCDE Driver
diff --git a/Documentation/gpu/meson.rst b/Documentation/gpu/meson.rst
new file mode 100644
index 0000000000..b9e2f9aa3b
--- /dev/null
+++ b/Documentation/gpu/meson.rst
@@ -0,0 +1,55 @@
+=============================================
+drm/meson AmLogic Meson Video Processing Unit
+=============================================
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_drv.c
+   :doc: Video Processing Unit
+
+Video Processing Unit
+=====================
+
+The Amlogic Meson Display controller is composed of several components
+that are going to be documented below:
+
+.. code::
+
+  DMC|---------------VPU (Video Processing Unit)----------------|------HHI------|
+     | vd1   _______     _____________    _________________     |               |
+  D  |-------|      |----|            |   |                |    |   HDMI PLL    |
+  D  | vd2   | VIU  |    | Video Post |   | Video Encoders |<---|-----VCLK      |
+  R  |-------|      |----| Processing |   |                |    |               |
+     | osd2  |      |    |            |---| Enci ----------|----|-----VDAC------|
+  R  |-------| CSC  |----| Scalers    |   | Encp ----------|----|----HDMI-TX----|
+  A  | osd1  |      |    | Blenders   |   | Encl ----------|----|---------------|
+  M  |-------|______|----|____________|   |________________|    |               |
+  ___|__________________________________________________________|_______________|
+
+Video Input Unit
+================
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_viu.c
+   :doc: Video Input Unit
+
+Video Post Processing
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_vpp.c
+   :doc: Video Post Processing
+
+Video Encoder
+=============
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_venc.c
+   :doc: Video Encoder
+
+Video Clocks
+============
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_vclk.c
+   :doc: Video Clocks
+
+HDMI Video Output
+=================
+
+.. kernel-doc:: drivers/gpu/drm/meson/meson_dw_hdmi.c
+   :doc: HDMI Output
diff --git a/Documentation/gpu/msm-crash-dump.rst b/Documentation/gpu/msm-crash-dump.rst
new file mode 100644
index 0000000000..9509cc4224
--- /dev/null
+++ b/Documentation/gpu/msm-crash-dump.rst
@@ -0,0 +1,98 @@
+:orphan:
+
+=====================
+MSM Crash Dump Format
+=====================
+
+Following a GPU hang the MSM driver outputs debugging information via
+/sys/kernel/dri/X/show or via devcoredump (/sys/class/devcoredump/dcdX/data).
+This document describes how the output is formatted.
+
+Each entry is in the form key: value. Sections headers will not have a value
+and all the contents of a section will be indented two spaces from the header.
+Each section might have multiple array entries the start of which is designated
+by a (-).
+
+Mappings
+--------
+
+kernel
+	The kernel version that generated the dump (UTS_RELEASE).
+
+module
+	The module that generated the crashdump.
+
+time
+	The kernel time at crash formatted as seconds.microseconds.
+
+comm
+	Comm string for the binary that generated the fault.
+
+cmdline
+	Command line for the binary that generated the fault.
+
+revision
+	ID of the GPU that generated the crash formatted as
+	core.major.minor.patchlevel separated by dots.
+
+rbbm-status
+	The current value of RBBM_STATUS which shows what top level GPU
+	components are in use at the time of crash.
+
+ringbuffer
+	Section containing the contents of each ringbuffer. Each ringbuffer is
+	identified with an id number.
+
+	id
+		Ringbuffer ID (0 based index).  Each ringbuffer in the section
+		will have its own unique id.
+	iova
+		GPU address of the ringbuffer.
+
+	last-fence
+		The last fence that was issued on the ringbuffer
+
+	retired-fence
+		The last fence retired on the ringbuffer.
+
+	rptr
+		The current read pointer (rptr) for the ringbuffer.
+
+	wptr
+		The current write pointer (wptr) for the ringbuffer.
+
+	size
+		Maximum size of the ringbuffer programmed in the hardware.
+
+	data
+		The contents of the ring encoded as ascii85.  Only the used
+		portions of the ring will be printed.
+
+bo
+	List of buffers from the hanging submission if available.
+	Each buffer object will have a uinque iova.
+
+	iova
+		GPU address of the buffer object.
+
+	size
+		Allocated size of the buffer object.
+
+	data
+		The contents of the buffer object encoded with ascii85.  Only
+		Trailing zeros at the end of the buffer will be skipped.
+
+registers
+	Set of registers values. Each entry is on its own line enclosed
+	by brackets { }.
+
+	offset
+		Byte offset of the register from the start of the
+		GPU memory region.
+
+	value
+		Hexadecimal value of the register.
+
+registers-hlsq
+		(5xx only) Register values from the HLSQ aperture.
+		Same format as the register section.
diff --git a/Documentation/gpu/pl111.rst b/Documentation/gpu/pl111.rst
new file mode 100644
index 0000000000..6d9a1b59a5
--- /dev/null
+++ b/Documentation/gpu/pl111.rst
@@ -0,0 +1,6 @@
+====================================================
+ drm/pl111 ARM PrimeCell PL110 and PL111 CLCD Driver
+====================================================
+
+.. kernel-doc:: drivers/gpu/drm/pl111/pl111_drv.c
+   :doc: ARM PrimeCell PL110 and PL111 CLCD Driver
diff --git a/Documentation/gpu/rfc/i915_gem_lmem.rst b/Documentation/gpu/rfc/i915_gem_lmem.rst
new file mode 100644
index 0000000000..b421a3c180
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_gem_lmem.rst
@@ -0,0 +1,22 @@
+=========================
+I915 DG1/LMEM RFC Section
+=========================
+
+Upstream plan
+=============
+For upstream the overall plan for landing all the DG1 stuff and turning it for
+real, with all the uAPI bits is:
+
+* Merge basic HW enabling of DG1(still without pciid)
+* Merge the uAPI bits behind special CONFIG_BROKEN(or so) flag
+        * At this point we can still make changes, but importantly this lets us
+          start running IGTs which can utilize local-memory in CI
+* Convert over to TTM, make sure it all keeps working. Some of the work items:
+        * TTM shrinker for discrete
+        * dma_resv_lockitem for full dma_resv_lock, i.e not just trylock
+        * Use TTM CPU pagefault handler
+        * Route shmem backend over to TTM SYSTEM for discrete
+        * TTM purgeable object support
+        * Move i915 buddy allocator over to TTM
+* Send RFC(with mesa-dev on cc) for final sign off on the uAPI
+* Add pciid for DG1 and turn on uAPI for real
diff --git a/Documentation/gpu/rfc/i915_scheduler.rst b/Documentation/gpu/rfc/i915_scheduler.rst
new file mode 100644
index 0000000000..c237ebc024
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_scheduler.rst
@@ -0,0 +1,152 @@
+=========================================
+I915 GuC Submission/DRM Scheduler Section
+=========================================
+
+Upstream plan
+=============
+For upstream the overall plan for landing GuC submission and integrating the
+i915 with the DRM scheduler is:
+
+* Merge basic GuC submission
+	* Basic submission support for all gen11+ platforms
+	* Not enabled by default on any current platforms but can be enabled via
+	  modparam enable_guc
+	* Lots of rework will need to be done to integrate with DRM scheduler so
+	  no need to nit pick everything in the code, it just should be
+	  functional, no major coding style / layering errors, and not regress
+	  execlists
+	* Update IGTs / selftests as needed to work with GuC submission
+	* Enable CI on supported platforms for a baseline
+	* Rework / get CI heathly for GuC submission in place as needed
+* Merge new parallel submission uAPI
+	* Bonding uAPI completely incompatible with GuC submission, plus it has
+	  severe design issues in general, which is why we want to retire it no
+	  matter what
+	* New uAPI adds I915_CONTEXT_ENGINES_EXT_PARALLEL context setup step
+	  which configures a slot with N contexts
+	* After I915_CONTEXT_ENGINES_EXT_PARALLEL a user can submit N batches to
+	  a slot in a single execbuf IOCTL and the batches run on the GPU in
+	  paralllel
+	* Initially only for GuC submission but execlists can be supported if
+	  needed
+* Convert the i915 to use the DRM scheduler
+	* GuC submission backend fully integrated with DRM scheduler
+		* All request queues removed from backend (e.g. all backpressure
+		  handled in DRM scheduler)
+		* Resets / cancels hook in DRM scheduler
+		* Watchdog hooks into DRM scheduler
+		* Lots of complexity of the GuC backend can be pulled out once
+		  integrated with DRM scheduler (e.g. state machine gets
+		  simpler, locking gets simpler, etc...)
+	* Execlists backend will minimum required to hook in the DRM scheduler
+		* Legacy interface
+		* Features like timeslicing / preemption / virtual engines would
+		  be difficult to integrate with the DRM scheduler and these
+		  features are not required for GuC submission as the GuC does
+		  these things for us
+		* ROI low on fully integrating into DRM scheduler
+		* Fully integrating would add lots of complexity to DRM
+		  scheduler
+	* Port i915 priority inheritance / boosting feature in DRM scheduler
+		* Used for i915 page flip, may be useful to other DRM drivers as
+		  well
+		* Will be an optional feature in the DRM scheduler
+	* Remove in-order completion assumptions from DRM scheduler
+		* Even when using the DRM scheduler the backends will handle
+		  preemption, timeslicing, etc... so it is possible for jobs to
+		  finish out of order
+	* Pull out i915 priority levels and use DRM priority levels
+	* Optimize DRM scheduler as needed
+
+TODOs for GuC submission upstream
+=================================
+
+* Need an update to GuC firmware / i915 to enable error state capture
+* Open source tool to decode GuC logs
+* Public GuC spec
+
+New uAPI for basic GuC submission
+=================================
+No major changes are required to the uAPI for basic GuC submission. The only
+change is a new scheduler attribute: I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP.
+This attribute indicates the 2k i915 user priority levels are statically mapped
+into 3 levels as follows:
+
+* -1k to -1 Low priority
+* 0 Medium priority
+* 1 to 1k High priority
+
+This is needed because the GuC only has 4 priority bands. The highest priority
+band is reserved with the kernel. This aligns with the DRM scheduler priority
+levels too.
+
+Spec references:
+----------------
+* https://www.khronos.org/registry/EGL/extensions/IMG/EGL_IMG_context_priority.txt
+* https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/chap5.html#devsandqueues-priority
+* https://spec.oneapi.com/level-zero/latest/core/api.html#ze-command-queue-priority-t
+
+New parallel submission uAPI
+============================
+The existing bonding uAPI is completely broken with GuC submission because
+whether a submission is a single context submit or parallel submit isn't known
+until execbuf time activated via the I915_SUBMIT_FENCE. To submit multiple
+contexts in parallel with the GuC the context must be explicitly registered with
+N contexts and all N contexts must be submitted in a single command to the GuC.
+The GuC interfaces do not support dynamically changing between N contexts as the
+bonding uAPI does. Hence the need for a new parallel submission interface. Also
+the legacy bonding uAPI is quite confusing and not intuitive at all. Furthermore
+I915_SUBMIT_FENCE is by design a future fence, so not really something we should
+continue to support.
+
+The new parallel submission uAPI consists of 3 parts:
+
+* Export engines logical mapping
+* A 'set_parallel' extension to configure contexts for parallel
+  submission
+* Extend execbuf2 IOCTL to support submitting N BBs in a single IOCTL
+
+Export engines logical mapping
+------------------------------
+Certain use cases require BBs to be placed on engine instances in logical order
+(e.g. split-frame on gen11+). The logical mapping of engine instances can change
+based on fusing. Rather than making UMDs be aware of fusing, simply expose the
+logical mapping with the existing query engine info IOCTL. Also the GuC
+submission interface currently only supports submitting multiple contexts to
+engines in logical order which is a new requirement compared to execlists.
+Lastly, all current platforms have at most 2 engine instances and the logical
+order is the same as uAPI order. This will change on platforms with more than 2
+engine instances.
+
+A single bit will be added to drm_i915_engine_info.flags indicating that the
+logical instance has been returned and a new field,
+drm_i915_engine_info.logical_instance, returns the logical instance.
+
+A 'set_parallel' extension to configure contexts for parallel submission
+------------------------------------------------------------------------
+The 'set_parallel' extension configures a slot for parallel submission of N BBs.
+It is a setup step that must be called before using any of the contexts. See
+I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE or I915_CONTEXT_ENGINES_EXT_BOND for
+similar existing examples. Once a slot is configured for parallel submission the
+execbuf2 IOCTL can be called submitting N BBs in a single IOCTL. Initially only
+supports GuC submission. Execlists supports can be added later if needed.
+
+Add I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT and
+drm_i915_context_engines_parallel_submit to the uAPI to implement this
+extension.
+
+.. c:namespace-push:: rfc
+
+.. kernel-doc:: include/uapi/drm/i915_drm.h
+        :functions: i915_context_engines_parallel_submit
+
+.. c:namespace-pop::
+
+Extend execbuf2 IOCTL to support submitting N BBs in a single IOCTL
+-------------------------------------------------------------------
+Contexts that have been configured with the 'set_parallel' extension can only
+submit N BBs in a single execbuf2 IOCTL. The BBs are either the last N objects
+in the drm_i915_gem_exec_object2 list or the first N if I915_EXEC_BATCH_FIRST is
+set. The number of BBs is implicit based on the slot submitted and how it has
+been configured by 'set_parallel' or other extensions. No uAPI changes are
+required to the execbuf2 IOCTL.
diff --git a/Documentation/gpu/rfc/i915_small_bar.h b/Documentation/gpu/rfc/i915_small_bar.h
new file mode 100644
index 0000000000..6003c81d5a
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_small_bar.h
@@ -0,0 +1,189 @@
+/**
+ * struct __drm_i915_memory_region_info - Describes one region as known to the
+ * driver.
+ *
+ * Note this is using both struct drm_i915_query_item and struct drm_i915_query.
+ * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS
+ * at &drm_i915_query_item.query_id.
+ */
+struct __drm_i915_memory_region_info {
+	/** @region: The class:instance pair encoding */
+	struct drm_i915_gem_memory_class_instance region;
+
+	/** @rsvd0: MBZ */
+	__u32 rsvd0;
+
+	/**
+	 * @probed_size: Memory probed by the driver
+	 *
+	 * Note that it should not be possible to ever encounter a zero value
+	 * here, also note that no current region type will ever return -1 here.
+	 * Although for future region types, this might be a possibility. The
+	 * same applies to the other size fields.
+	 */
+	__u64 probed_size;
+
+	/**
+	 * @unallocated_size: Estimate of memory remaining
+	 *
+	 * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting.
+	 * Without this (or if this is an older kernel) the value here will
+	 * always equal the @probed_size. Note this is only currently tracked
+	 * for I915_MEMORY_CLASS_DEVICE regions (for other types the value here
+	 * will always equal the @probed_size).
+	 */
+	__u64 unallocated_size;
+
+	union {
+		/** @rsvd1: MBZ */
+		__u64 rsvd1[8];
+		struct {
+			/**
+			 * @probed_cpu_visible_size: Memory probed by the driver
+			 * that is CPU accessible.
+			 *
+			 * This will be always be <= @probed_size, and the
+			 * remainder (if there is any) will not be CPU
+			 * accessible.
+			 *
+			 * On systems without small BAR, the @probed_size will
+			 * always equal the @probed_cpu_visible_size, since all
+			 * of it will be CPU accessible.
+			 *
+			 * Note this is only tracked for
+			 * I915_MEMORY_CLASS_DEVICE regions (for other types the
+			 * value here will always equal the @probed_size).
+			 *
+			 * Note that if the value returned here is zero, then
+			 * this must be an old kernel which lacks the relevant
+			 * small-bar uAPI support (including
+			 * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS), but on
+			 * such systems we should never actually end up with a
+			 * small BAR configuration, assuming we are able to load
+			 * the kernel module. Hence it should be safe to treat
+			 * this the same as when @probed_cpu_visible_size ==
+			 * @probed_size.
+			 */
+			__u64 probed_cpu_visible_size;
+
+			/**
+			 * @unallocated_cpu_visible_size: Estimate of CPU
+			 * visible memory remaining
+			 *
+			 * Note this is only tracked for
+			 * I915_MEMORY_CLASS_DEVICE regions (for other types the
+			 * value here will always equal the
+			 * @probed_cpu_visible_size).
+			 *
+			 * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable
+			 * accounting.  Without this the value here will always
+			 * equal the @probed_cpu_visible_size. Note this is only
+			 * currently tracked for I915_MEMORY_CLASS_DEVICE
+			 * regions (for other types the value here will also
+			 * always equal the @probed_cpu_visible_size).
+			 *
+			 * If this is an older kernel the value here will be
+			 * zero, see also @probed_cpu_visible_size.
+			 */
+			__u64 unallocated_cpu_visible_size;
+		};
+	};
+};
+
+/**
+ * struct __drm_i915_gem_create_ext - Existing gem_create behaviour, with added
+ * extension support using struct i915_user_extension.
+ *
+ * Note that new buffer flags should be added here, at least for the stuff that
+ * is immutable. Previously we would have two ioctls, one to create the object
+ * with gem_create, and another to apply various parameters, however this
+ * creates some ambiguity for the params which are considered immutable. Also in
+ * general we're phasing out the various SET/GET ioctls.
+ */
+struct __drm_i915_gem_create_ext {
+	/**
+	 * @size: Requested size for the object.
+	 *
+	 * The (page-aligned) allocated size for the object will be returned.
+	 *
+	 * Note that for some devices we have might have further minimum
+	 * page-size restrictions (larger than 4K), like for device local-memory.
+	 * However in general the final size here should always reflect any
+	 * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
+	 * extension to place the object in device local-memory. The kernel will
+	 * always select the largest minimum page-size for the set of possible
+	 * placements as the value to use when rounding up the @size.
+	 */
+	__u64 size;
+
+	/**
+	 * @handle: Returned handle for the object.
+	 *
+	 * Object handles are nonzero.
+	 */
+	__u32 handle;
+
+	/**
+	 * @flags: Optional flags.
+	 *
+	 * Supported values:
+	 *
+	 * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS - Signal to the kernel that
+	 * the object will need to be accessed via the CPU.
+	 *
+	 * Only valid when placing objects in I915_MEMORY_CLASS_DEVICE, and only
+	 * strictly required on configurations where some subset of the device
+	 * memory is directly visible/mappable through the CPU (which we also
+	 * call small BAR), like on some DG2+ systems. Note that this is quite
+	 * undesirable, but due to various factors like the client CPU, BIOS etc
+	 * it's something we can expect to see in the wild. See
+	 * &__drm_i915_memory_region_info.probed_cpu_visible_size for how to
+	 * determine if this system applies.
+	 *
+	 * Note that one of the placements MUST be I915_MEMORY_CLASS_SYSTEM, to
+	 * ensure the kernel can always spill the allocation to system memory,
+	 * if the object can't be allocated in the mappable part of
+	 * I915_MEMORY_CLASS_DEVICE.
+	 *
+	 * Also note that since the kernel only supports flat-CCS on objects
+	 * that can *only* be placed in I915_MEMORY_CLASS_DEVICE, we therefore
+	 * don't support I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS together with
+	 * flat-CCS.
+	 *
+	 * Without this hint, the kernel will assume that non-mappable
+	 * I915_MEMORY_CLASS_DEVICE is preferred for this object. Note that the
+	 * kernel can still migrate the object to the mappable part, as a last
+	 * resort, if userspace ever CPU faults this object, but this might be
+	 * expensive, and so ideally should be avoided.
+	 *
+	 * On older kernels which lack the relevant small-bar uAPI support (see
+	 * also &__drm_i915_memory_region_info.probed_cpu_visible_size),
+	 * usage of the flag will result in an error, but it should NEVER be
+	 * possible to end up with a small BAR configuration, assuming we can
+	 * also successfully load the i915 kernel module. In such cases the
+	 * entire I915_MEMORY_CLASS_DEVICE region will be CPU accessible, and as
+	 * such there are zero restrictions on where the object can be placed.
+	 */
+#define I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS (1 << 0)
+	__u32 flags;
+
+	/**
+	 * @extensions: The chain of extensions to apply to this object.
+	 *
+	 * This will be useful in the future when we need to support several
+	 * different extensions, and we need to apply more than one when
+	 * creating the object. See struct i915_user_extension.
+	 *
+	 * If we don't supply any extensions then we get the same old gem_create
+	 * behaviour.
+	 *
+	 * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see
+	 * struct drm_i915_gem_create_ext_memory_regions.
+	 *
+	 * For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see
+	 * struct drm_i915_gem_create_ext_protected_content.
+	 */
+#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0
+#define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1
+	__u64 extensions;
+};
diff --git a/Documentation/gpu/rfc/i915_small_bar.rst b/Documentation/gpu/rfc/i915_small_bar.rst
new file mode 100644
index 0000000000..d6c03ce3b8
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_small_bar.rst
@@ -0,0 +1,47 @@
+==========================
+I915 Small BAR RFC Section
+==========================
+Starting from DG2 we will have resizable BAR support for device local-memory(i.e
+I915_MEMORY_CLASS_DEVICE), but in some cases the final BAR size might still be
+smaller than the total probed_size. In such cases, only some subset of
+I915_MEMORY_CLASS_DEVICE will be CPU accessible(for example the first 256M),
+while the remainder is only accessible via the GPU.
+
+I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS flag
+----------------------------------------------
+New gem_create_ext flag to tell the kernel that a BO will require CPU access.
+This becomes important when placing an object in I915_MEMORY_CLASS_DEVICE, where
+underneath the device has a small BAR, meaning only some portion of it is CPU
+accessible. Without this flag the kernel will assume that CPU access is not
+required, and prioritize using the non-CPU visible portion of
+I915_MEMORY_CLASS_DEVICE.
+
+.. kernel-doc:: Documentation/gpu/rfc/i915_small_bar.h
+   :functions: __drm_i915_gem_create_ext
+
+probed_cpu_visible_size attribute
+---------------------------------
+New struct__drm_i915_memory_region attribute which returns the total size of the
+CPU accessible portion, for the particular region. This should only be
+applicable for I915_MEMORY_CLASS_DEVICE. We also report the
+unallocated_cpu_visible_size, alongside the unallocated_size.
+
+Vulkan will need this as part of creating a separate VkMemoryHeap with the
+VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT set, to represent the CPU visible portion,
+where the total size of the heap needs to be known. It also wants to be able to
+give a rough estimate of how memory can potentially be allocated.
+
+.. kernel-doc:: Documentation/gpu/rfc/i915_small_bar.h
+   :functions: __drm_i915_memory_region_info
+
+Error Capture restrictions
+--------------------------
+With error capture we have two new restrictions:
+
+    1) Error capture is best effort on small BAR systems; if the pages are not
+    CPU accessible, at the time of capture, then the kernel is free to skip
+    trying to capture them.
+
+    2) On discrete and newer integrated platforms we now reject error capture
+    on recoverable contexts. In the future the kernel may want to blit during
+    error capture, when for example something is not currently CPU accessible.
diff --git a/Documentation/gpu/rfc/i915_vm_bind.h b/Documentation/gpu/rfc/i915_vm_bind.h
new file mode 100644
index 0000000000..8a8fcd4fce
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_vm_bind.h
@@ -0,0 +1,291 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+/**
+ * DOC: I915_PARAM_VM_BIND_VERSION
+ *
+ * VM_BIND feature version supported.
+ * See typedef drm_i915_getparam_t param.
+ *
+ * Specifies the VM_BIND feature version supported.
+ * The following versions of VM_BIND have been defined:
+ *
+ * 0: No VM_BIND support.
+ *
+ * 1: In VM_UNBIND calls, the UMD must specify the exact mappings created
+ *    previously with VM_BIND, the ioctl will not support unbinding multiple
+ *    mappings or splitting them. Similarly, VM_BIND calls will not replace
+ *    any existing mappings.
+ *
+ * 2: The restrictions on unbinding partial or multiple mappings is
+ *    lifted, Similarly, binding will replace any mappings in the given range.
+ *
+ * See struct drm_i915_gem_vm_bind and struct drm_i915_gem_vm_unbind.
+ */
+#define I915_PARAM_VM_BIND_VERSION	57
+
+/**
+ * DOC: I915_VM_CREATE_FLAGS_USE_VM_BIND
+ *
+ * Flag to opt-in for VM_BIND mode of binding during VM creation.
+ * See struct drm_i915_gem_vm_control flags.
+ *
+ * The older execbuf2 ioctl will not support VM_BIND mode of operation.
+ * For VM_BIND mode, we have new execbuf3 ioctl which will not accept any
+ * execlist (See struct drm_i915_gem_execbuffer3 for more details).
+ */
+#define I915_VM_CREATE_FLAGS_USE_VM_BIND	(1 << 0)
+
+/* VM_BIND related ioctls */
+#define DRM_I915_GEM_VM_BIND		0x3d
+#define DRM_I915_GEM_VM_UNBIND		0x3e
+#define DRM_I915_GEM_EXECBUFFER3	0x3f
+
+#define DRM_IOCTL_I915_GEM_VM_BIND		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_BIND, struct drm_i915_gem_vm_bind)
+#define DRM_IOCTL_I915_GEM_VM_UNBIND		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_UNBIND, struct drm_i915_gem_vm_bind)
+#define DRM_IOCTL_I915_GEM_EXECBUFFER3		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER3, struct drm_i915_gem_execbuffer3)
+
+/**
+ * struct drm_i915_gem_timeline_fence - An input or output timeline fence.
+ *
+ * The operation will wait for input fence to signal.
+ *
+ * The returned output fence will be signaled after the completion of the
+ * operation.
+ */
+struct drm_i915_gem_timeline_fence {
+	/** @handle: User's handle for a drm_syncobj to wait on or signal. */
+	__u32 handle;
+
+	/**
+	 * @flags: Supported flags are:
+	 *
+	 * I915_TIMELINE_FENCE_WAIT:
+	 * Wait for the input fence before the operation.
+	 *
+	 * I915_TIMELINE_FENCE_SIGNAL:
+	 * Return operation completion fence as output.
+	 */
+	__u32 flags;
+#define I915_TIMELINE_FENCE_WAIT            (1 << 0)
+#define I915_TIMELINE_FENCE_SIGNAL          (1 << 1)
+#define __I915_TIMELINE_FENCE_UNKNOWN_FLAGS (-(I915_TIMELINE_FENCE_SIGNAL << 1))
+
+	/**
+	 * @value: A point in the timeline.
+	 * Value must be 0 for a binary drm_syncobj. A Value of 0 for a
+	 * timeline drm_syncobj is invalid as it turns a drm_syncobj into a
+	 * binary one.
+	 */
+	__u64 value;
+};
+
+/**
+ * struct drm_i915_gem_vm_bind - VA to object mapping to bind.
+ *
+ * This structure is passed to VM_BIND ioctl and specifies the mapping of GPU
+ * virtual address (VA) range to the section of an object that should be bound
+ * in the device page table of the specified address space (VM).
+ * The VA range specified must be unique (ie., not currently bound) and can
+ * be mapped to whole object or a section of the object (partial binding).
+ * Multiple VA mappings can be created to the same section of the object
+ * (aliasing).
+ *
+ * The @start, @offset and @length must be 4K page aligned. However the DG2
+ * and XEHPSDV has 64K page size for device local memory and has compact page
+ * table. On those platforms, for binding device local-memory objects, the
+ * @start, @offset and @length must be 64K aligned. Also, UMDs should not mix
+ * the local memory 64K page and the system memory 4K page bindings in the same
+ * 2M range.
+ *
+ * Error code -EINVAL will be returned if @start, @offset and @length are not
+ * properly aligned. In version 1 (See I915_PARAM_VM_BIND_VERSION), error code
+ * -ENOSPC will be returned if the VA range specified can't be reserved.
+ *
+ * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently
+ * are not ordered. Furthermore, parts of the VM_BIND operation can be done
+ * asynchronously, if valid @fence is specified.
+ */
+struct drm_i915_gem_vm_bind {
+	/** @vm_id: VM (address space) id to bind */
+	__u32 vm_id;
+
+	/** @handle: Object handle */
+	__u32 handle;
+
+	/** @start: Virtual Address start to bind */
+	__u64 start;
+
+	/** @offset: Offset in object to bind */
+	__u64 offset;
+
+	/** @length: Length of mapping to bind */
+	__u64 length;
+
+	/**
+	 * @flags: Supported flags are:
+	 *
+	 * I915_GEM_VM_BIND_CAPTURE:
+	 * Capture this mapping in the dump upon GPU error.
+	 *
+	 * Note that @fence carries its own flags.
+	 */
+	__u64 flags;
+#define I915_GEM_VM_BIND_CAPTURE	(1 << 0)
+
+	/**
+	 * @fence: Timeline fence for bind completion signaling.
+	 *
+	 * Timeline fence is of format struct drm_i915_gem_timeline_fence.
+	 *
+	 * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag
+	 * is invalid, and an error will be returned.
+	 *
+	 * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence
+	 * is not requested and binding is completed synchronously.
+	 */
+	struct drm_i915_gem_timeline_fence fence;
+
+	/**
+	 * @extensions: Zero-terminated chain of extensions.
+	 *
+	 * For future extensions. See struct i915_user_extension.
+	 */
+	__u64 extensions;
+};
+
+/**
+ * struct drm_i915_gem_vm_unbind - VA to object mapping to unbind.
+ *
+ * This structure is passed to VM_UNBIND ioctl and specifies the GPU virtual
+ * address (VA) range that should be unbound from the device page table of the
+ * specified address space (VM). VM_UNBIND will force unbind the specified
+ * range from device page table without waiting for any GPU job to complete.
+ * It is UMDs responsibility to ensure the mapping is no longer in use before
+ * calling VM_UNBIND.
+ *
+ * If the specified mapping is not found, the ioctl will simply return without
+ * any error.
+ *
+ * VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently
+ * are not ordered. Furthermore, parts of the VM_UNBIND operation can be done
+ * asynchronously, if valid @fence is specified.
+ */
+struct drm_i915_gem_vm_unbind {
+	/** @vm_id: VM (address space) id to bind */
+	__u32 vm_id;
+
+	/** @rsvd: Reserved, MBZ */
+	__u32 rsvd;
+
+	/** @start: Virtual Address start to unbind */
+	__u64 start;
+
+	/** @length: Length of mapping to unbind */
+	__u64 length;
+
+	/**
+	 * @flags: Currently reserved, MBZ.
+	 *
+	 * Note that @fence carries its own flags.
+	 */
+	__u64 flags;
+
+	/**
+	 * @fence: Timeline fence for unbind completion signaling.
+	 *
+	 * Timeline fence is of format struct drm_i915_gem_timeline_fence.
+	 *
+	 * It is an out fence, hence using I915_TIMELINE_FENCE_WAIT flag
+	 * is invalid, and an error will be returned.
+	 *
+	 * If I915_TIMELINE_FENCE_SIGNAL flag is not set, then out fence
+	 * is not requested and unbinding is completed synchronously.
+	 */
+	struct drm_i915_gem_timeline_fence fence;
+
+	/**
+	 * @extensions: Zero-terminated chain of extensions.
+	 *
+	 * For future extensions. See struct i915_user_extension.
+	 */
+	__u64 extensions;
+};
+
+/**
+ * struct drm_i915_gem_execbuffer3 - Structure for DRM_I915_GEM_EXECBUFFER3
+ * ioctl.
+ *
+ * DRM_I915_GEM_EXECBUFFER3 ioctl only works in VM_BIND mode and VM_BIND mode
+ * only works with this ioctl for submission.
+ * See I915_VM_CREATE_FLAGS_USE_VM_BIND.
+ */
+struct drm_i915_gem_execbuffer3 {
+	/**
+	 * @ctx_id: Context id
+	 *
+	 * Only contexts with user engine map are allowed.
+	 */
+	__u32 ctx_id;
+
+	/**
+	 * @engine_idx: Engine index
+	 *
+	 * An index in the user engine map of the context specified by @ctx_id.
+	 */
+	__u32 engine_idx;
+
+	/**
+	 * @batch_address: Batch gpu virtual address/es.
+	 *
+	 * For normal submission, it is the gpu virtual address of the batch
+	 * buffer. For parallel submission, it is a pointer to an array of
+	 * batch buffer gpu virtual addresses with array size equal to the
+	 * number of (parallel) engines involved in that submission (See
+	 * struct i915_context_engines_parallel_submit).
+	 */
+	__u64 batch_address;
+
+	/** @flags: Currently reserved, MBZ */
+	__u64 flags;
+
+	/** @rsvd1: Reserved, MBZ */
+	__u32 rsvd1;
+
+	/** @fence_count: Number of fences in @timeline_fences array. */
+	__u32 fence_count;
+
+	/**
+	 * @timeline_fences: Pointer to an array of timeline fences.
+	 *
+	 * Timeline fences are of format struct drm_i915_gem_timeline_fence.
+	 */
+	__u64 timeline_fences;
+
+	/** @rsvd2: Reserved, MBZ */
+	__u64 rsvd2;
+
+	/**
+	 * @extensions: Zero-terminated chain of extensions.
+	 *
+	 * For future extensions. See struct i915_user_extension.
+	 */
+	__u64 extensions;
+};
+
+/**
+ * struct drm_i915_gem_create_ext_vm_private - Extension to make the object
+ * private to the specified VM.
+ *
+ * See struct drm_i915_gem_create_ext.
+ */
+struct drm_i915_gem_create_ext_vm_private {
+#define I915_GEM_CREATE_EXT_VM_PRIVATE		2
+	/** @base: Extension link. See struct i915_user_extension. */
+	struct i915_user_extension base;
+
+	/** @vm_id: Id of the VM to which the object is private */
+	__u32 vm_id;
+};
diff --git a/Documentation/gpu/rfc/i915_vm_bind.rst b/Documentation/gpu/rfc/i915_vm_bind.rst
new file mode 100644
index 0000000000..0b3b525ac6
--- /dev/null
+++ b/Documentation/gpu/rfc/i915_vm_bind.rst
@@ -0,0 +1,245 @@
+==========================================
+I915 VM_BIND feature design and use cases
+==========================================
+
+VM_BIND feature
+================
+DRM_I915_GEM_VM_BIND/UNBIND ioctls allows UMD to bind/unbind GEM buffer
+objects (BOs) or sections of a BOs at specified GPU virtual addresses on a
+specified address space (VM). These mappings (also referred to as persistent
+mappings) will be persistent across multiple GPU submissions (execbuf calls)
+issued by the UMD, without user having to provide a list of all required
+mappings during each submission (as required by older execbuf mode).
+
+The VM_BIND/UNBIND calls allow UMDs to request a timeline out fence for
+signaling the completion of bind/unbind operation.
+
+VM_BIND feature is advertised to user via I915_PARAM_VM_BIND_VERSION.
+User has to opt-in for VM_BIND mode of binding for an address space (VM)
+during VM creation time via I915_VM_CREATE_FLAGS_USE_VM_BIND extension.
+
+VM_BIND/UNBIND ioctl calls executed on different CPU threads concurrently are
+not ordered. Furthermore, parts of the VM_BIND/UNBIND operations can be done
+asynchronously, when valid out fence is specified.
+
+VM_BIND features include:
+
+* Multiple Virtual Address (VA) mappings can map to the same physical pages
+  of an object (aliasing).
+* VA mapping can map to a partial section of the BO (partial binding).
+* Support capture of persistent mappings in the dump upon GPU error.
+* Support for userptr gem objects (no special uapi is required for this).
+
+TLB flush consideration
+------------------------
+The i915 driver flushes the TLB for each submission and when an object's
+pages are released. The VM_BIND/UNBIND operation will not do any additional
+TLB flush. Any VM_BIND mapping added will be in the working set for subsequent
+submissions on that VM and will not be in the working set for currently running
+batches (which would require additional TLB flushes, which is not supported).
+
+Execbuf ioctl in VM_BIND mode
+-------------------------------
+A VM in VM_BIND mode will not support older execbuf mode of binding.
+The execbuf ioctl handling in VM_BIND mode differs significantly from the
+older execbuf2 ioctl (See struct drm_i915_gem_execbuffer2).
+Hence, a new execbuf3 ioctl has been added to support VM_BIND mode. (See
+struct drm_i915_gem_execbuffer3). The execbuf3 ioctl will not accept any
+execlist. Hence, no support for implicit sync. It is expected that the below
+work will be able to support requirements of object dependency setting in all
+use cases:
+
+"dma-buf: Add an API for exporting sync files"
+(https://lwn.net/Articles/859290/)
+
+The new execbuf3 ioctl only works in VM_BIND mode and the VM_BIND mode only
+works with execbuf3 ioctl for submission. All BOs mapped on that VM (through
+VM_BIND call) at the time of execbuf3 call are deemed required for that
+submission.
+
+The execbuf3 ioctl directly specifies the batch addresses instead of as
+object handles as in execbuf2 ioctl. The execbuf3 ioctl will also not
+support many of the older features like in/out/submit fences, fence array,
+default gem context and many more (See struct drm_i915_gem_execbuffer3).
+
+In VM_BIND mode, VA allocation is completely managed by the user instead of
+the i915 driver. Hence all VA assignment, eviction are not applicable in
+VM_BIND mode. Also, for determining object activeness, VM_BIND mode will not
+be using the i915_vma active reference tracking. It will instead use dma-resv
+object for that (See `VM_BIND dma_resv usage`_).
+
+So, a lot of existing code supporting execbuf2 ioctl, like relocations, VA
+evictions, vma lookup table, implicit sync, vma active reference tracking etc.,
+are not applicable for execbuf3 ioctl. Hence, all execbuf3 specific handling
+should be in a separate file and only functionalities common to these ioctls
+can be the shared code where possible.
+
+VM_PRIVATE objects
+-------------------
+By default, BOs can be mapped on multiple VMs and can also be dma-buf
+exported. Hence these BOs are referred to as Shared BOs.
+During each execbuf submission, the request fence must be added to the
+dma-resv fence list of all shared BOs mapped on the VM.
+
+VM_BIND feature introduces an optimization where user can create BO which
+is private to a specified VM via I915_GEM_CREATE_EXT_VM_PRIVATE flag during
+BO creation. Unlike Shared BOs, these VM private BOs can only be mapped on
+the VM they are private to and can't be dma-buf exported.
+All private BOs of a VM share the dma-resv object. Hence during each execbuf
+submission, they need only one dma-resv fence list updated. Thus, the fast
+path (where required mappings are already bound) submission latency is O(1)
+w.r.t the number of VM private BOs.
+
+VM_BIND locking hierarchy
+-------------------------
+The locking design here supports the older (execlist based) execbuf mode, the
+newer VM_BIND mode, the VM_BIND mode with GPU page faults and possible future
+system allocator support (See `Shared Virtual Memory (SVM) support`_).
+The older execbuf mode and the newer VM_BIND mode without page faults manages
+residency of backing storage using dma_fence. The VM_BIND mode with page faults
+and the system allocator support do not use any dma_fence at all.
+
+VM_BIND locking order is as below.
+
+1) Lock-A: A vm_bind mutex will protect vm_bind lists. This lock is taken in
+   vm_bind/vm_unbind ioctl calls, in the execbuf path and while releasing the
+   mapping.
+
+   In future, when GPU page faults are supported, we can potentially use a
+   rwsem instead, so that multiple page fault handlers can take the read side
+   lock to lookup the mapping and hence can run in parallel.
+   The older execbuf mode of binding do not need this lock.
+
+2) Lock-B: The object's dma-resv lock will protect i915_vma state and needs to
+   be held while binding/unbinding a vma in the async worker and while updating
+   dma-resv fence list of an object. Note that private BOs of a VM will all
+   share a dma-resv object.
+
+   The future system allocator support will use the HMM prescribed locking
+   instead.
+
+3) Lock-C: Spinlock/s to protect some of the VM's lists like the list of
+   invalidated vmas (due to eviction and userptr invalidation) etc.
+
+When GPU page faults are supported, the execbuf path do not take any of these
+locks. There we will simply smash the new batch buffer address into the ring and
+then tell the scheduler run that. The lock taking only happens from the page
+fault handler, where we take lock-A in read mode, whichever lock-B we need to
+find the backing storage (dma_resv lock for gem objects, and hmm/core mm for
+system allocator) and some additional locks (lock-D) for taking care of page
+table races. Page fault mode should not need to ever manipulate the vm lists,
+so won't ever need lock-C.
+
+VM_BIND LRU handling
+---------------------
+We need to ensure VM_BIND mapped objects are properly LRU tagged to avoid
+performance degradation. We will also need support for bulk LRU movement of
+VM_BIND objects to avoid additional latencies in execbuf path.
+
+The page table pages are similar to VM_BIND mapped objects (See
+`Evictable page table allocations`_) and are maintained per VM and needs to
+be pinned in memory when VM is made active (ie., upon an execbuf call with
+that VM). So, bulk LRU movement of page table pages is also needed.
+
+VM_BIND dma_resv usage
+-----------------------
+Fences needs to be added to all VM_BIND mapped objects. During each execbuf
+submission, they are added with DMA_RESV_USAGE_BOOKKEEP usage to prevent
+over sync (See enum dma_resv_usage). One can override it with either
+DMA_RESV_USAGE_READ or DMA_RESV_USAGE_WRITE usage during explicit object
+dependency setting.
+
+Note that DRM_I915_GEM_WAIT and DRM_I915_GEM_BUSY ioctls do not check for
+DMA_RESV_USAGE_BOOKKEEP usage and hence should not be used for end of batch
+check. Instead, the execbuf3 out fence should be used for end of batch check
+(See struct drm_i915_gem_execbuffer3).
+
+Also, in VM_BIND mode, use dma-resv apis for determining object activeness
+(See dma_resv_test_signaled() and dma_resv_wait_timeout()) and do not use the
+older i915_vma active reference tracking which is deprecated. This should be
+easier to get it working with the current TTM backend.
+
+Mesa use case
+--------------
+VM_BIND can potentially reduce the CPU overhead in Mesa (both Vulkan and Iris),
+hence improving performance of CPU-bound applications. It also allows us to
+implement Vulkan's Sparse Resources. With increasing GPU hardware performance,
+reducing CPU overhead becomes more impactful.
+
+
+Other VM_BIND use cases
+========================
+
+Long running Compute contexts
+------------------------------
+Usage of dma-fence expects that they complete in reasonable amount of time.
+Compute on the other hand can be long running. Hence it is appropriate for
+compute to use user/memory fence (See `User/Memory Fence`_) and dma-fence usage
+must be limited to in-kernel consumption only.
+
+Where GPU page faults are not available, kernel driver upon buffer invalidation
+will initiate a suspend (preemption) of long running context, finish the
+invalidation, revalidate the BO and then resume the compute context. This is
+done by having a per-context preempt fence which is enabled when someone tries
+to wait on it and triggers the context preemption.
+
+User/Memory Fence
+~~~~~~~~~~~~~~~~~~
+User/Memory fence is a <address, value> pair. To signal the user fence, the
+specified value will be written at the specified virtual address and wakeup the
+waiting process. User fence can be signaled either by the GPU or kernel async
+worker (like upon bind completion). User can wait on a user fence with a new
+user fence wait ioctl.
+
+Here is some prior work on this:
+https://patchwork.freedesktop.org/patch/349417/
+
+Low Latency Submission
+~~~~~~~~~~~~~~~~~~~~~~~
+Allows compute UMD to directly submit GPU jobs instead of through execbuf
+ioctl. This is made possible by VM_BIND is not being synchronized against
+execbuf. VM_BIND allows bind/unbind of mappings required for the directly
+submitted jobs.
+
+Debugger
+---------
+With debug event interface user space process (debugger) is able to keep track
+of and act upon resources created by another process (debugged) and attached
+to GPU via vm_bind interface.
+
+GPU page faults
+----------------
+GPU page faults when supported (in future), will only be supported in the
+VM_BIND mode. While both the older execbuf mode and the newer VM_BIND mode of
+binding will require using dma-fence to ensure residency, the GPU page faults
+mode when supported, will not use any dma-fence as residency is purely managed
+by installing and removing/invalidating page table entries.
+
+Page level hints settings
+--------------------------
+VM_BIND allows any hints setting per mapping instead of per BO. Possible hints
+include placement and atomicity. Sub-BO level placement hint will be even more
+relevant with upcoming GPU on-demand page fault support.
+
+Page level Cache/CLOS settings
+-------------------------------
+VM_BIND allows cache/CLOS settings per mapping instead of per BO.
+
+Evictable page table allocations
+---------------------------------
+Make pagetable allocations evictable and manage them similar to VM_BIND
+mapped objects. Page table pages are similar to persistent mappings of a
+VM (difference here are that the page table pages will not have an i915_vma
+structure and after swapping pages back in, parent page link needs to be
+updated).
+
+Shared Virtual Memory (SVM) support
+------------------------------------
+VM_BIND interface can be used to map system memory directly (without gem BO
+abstraction) using the HMM interface. SVM is only supported with GPU page
+faults enabled.
+
+VM_BIND UAPI
+=============
+
+.. kernel-doc:: Documentation/gpu/rfc/i915_vm_bind.h
diff --git a/Documentation/gpu/rfc/index.rst b/Documentation/gpu/rfc/index.rst
new file mode 100644
index 0000000000..e4f7b00513
--- /dev/null
+++ b/Documentation/gpu/rfc/index.rst
@@ -0,0 +1,37 @@
+===============
+GPU RFC Section
+===============
+
+For complex work, especially new uapi, it is often good to nail the high level
+design issues before getting lost in the code details. This section is meant to
+host such documentation:
+
+* Each RFC should be a section in this file, explaining the goal and main design
+  considerations. Especially for uapi make sure you Cc: all relevant project
+  mailing lists and involved people outside of dri-devel.
+
+* For uapi structures add a file to this directory with and then pull the
+  kerneldoc in like with real uapi headers.
+
+* Once the code has landed move all the documentation to the right places in
+  the main core, helper or driver sections.
+
+.. toctree::
+
+    i915_gem_lmem.rst
+
+.. toctree::
+
+    i915_scheduler.rst
+
+.. toctree::
+
+    i915_small_bar.rst
+
+.. toctree::
+
+    i915_vm_bind.rst
+
+.. toctree::
+
+   xe.rst
diff --git a/Documentation/gpu/rfc/xe.rst b/Documentation/gpu/rfc/xe.rst
new file mode 100644
index 0000000000..2516fe141d
--- /dev/null
+++ b/Documentation/gpu/rfc/xe.rst
@@ -0,0 +1,235 @@
+==========================
+Xe – Merge Acceptance Plan
+==========================
+Xe is a new driver for Intel GPUs that supports both integrated and
+discrete platforms starting with Tiger Lake (first Intel Xe Architecture).
+
+This document aims to establish a merge plan for the Xe, by writing down clear
+pre-merge goals, in order to avoid unnecessary delays.
+
+Xe – Overview
+=============
+The main motivation of Xe is to have a fresh base to work from that is
+unencumbered by older platforms, whilst also taking the opportunity to
+rearchitect our driver to increase sharing across the drm subsystem, both
+leveraging and allowing us to contribute more towards other shared components
+like TTM and drm/scheduler.
+
+This is also an opportunity to start from the beginning with a clean uAPI that is
+extensible by design and already aligned with the modern userspace needs. For
+this reason, the memory model is solely based on GPU Virtual Address space
+bind/unbind (‘VM_BIND’) of GEM buffer objects (BOs) and execution only supporting
+explicit synchronization. With persistent mapping across the execution, the
+userspace does not need to provide a list of all required mappings during each
+submission.
+
+The new driver leverages a lot from i915. As for display, the intent is to share
+the display code with the i915 driver so that there is maximum reuse there.
+
+As for the power management area, the goal is to have a much-simplified support
+for the system suspend states (S-states), PCI device suspend states (D-states),
+GPU/Render suspend states (R-states) and frequency management. It should leverage
+as much as possible all the existent PCI-subsystem infrastructure (pm and
+runtime_pm) and underlying firmware components such PCODE and GuC for the power
+states and frequency decisions.
+
+Repository:
+
+https://gitlab.freedesktop.org/drm/xe/kernel (branch drm-xe-next)
+
+Xe – Platforms
+==============
+Currently, Xe is already functional and has experimental support for multiple
+platforms starting from Tiger Lake, with initial support in userspace implemented
+in Mesa (for Iris and Anv, our OpenGL and Vulkan drivers), as well as in NEO
+(for OpenCL and Level0).
+
+During a transition period, platforms will be supported by both Xe and i915.
+However, the force_probe mechanism existent in both drivers will allow only one
+official and by-default probe at a given time.
+
+For instance, in order to probe a DG2 which PCI ID is 0x5690 by Xe instead of
+i915, the following set of parameters need to be used:
+
+```
+i915.force_probe=!5690 xe.force_probe=5690
+```
+
+In both drivers, the ‘.require_force_probe’ protection forces the user to use the
+force_probe parameter while the driver is under development. This protection is
+only removed when the support for the platform and the uAPI are stable. Stability
+which needs to be demonstrated by CI results.
+
+In order to avoid user space regressions, i915 will continue to support all the
+current platforms that are already out of this protection. Xe support will be
+forever experimental and dependent on the usage of force_probe for these
+platforms.
+
+When the time comes for Xe, the protection will be lifted on Xe and kept in i915.
+
+Xe driver will be protected with both STAGING Kconfig and force_probe. Changes in
+the uAPI are expected while the driver is behind these protections. STAGING will
+be removed when the driver uAPI gets to a mature state where we can guarantee the
+‘no regression’ rule. Then force_probe will be lifted only for future platforms
+that will be productized with Xe driver, but not with i915.
+
+Xe – Pre-Merge Goals
+====================
+
+Drm_scheduler
+-------------
+Xe primarily uses Firmware based scheduling (GuC FW). However, it will use
+drm_scheduler as the scheduler ‘frontend’ for userspace submission in order to
+resolve syncobj and dma-buf implicit sync dependencies. However, drm_scheduler is
+not yet prepared to handle the 1-to-1 relationship between drm_gpu_scheduler and
+drm_sched_entity.
+
+Deeper changes to drm_scheduler should *not* be required to get Xe accepted, but
+some consensus needs to be reached between Xe and other community drivers that
+could also benefit from this work, for coupling FW based/assisted submission such
+as the ARM’s new Mali GPU driver, and others.
+
+As a key measurable result, the patch series introducing Xe itself shall not
+depend on any other patch touching drm_scheduler itself that was not yet merged
+through drm-misc. This, by itself, already includes the reach of an agreement for
+uniform 1 to 1 relationship implementation / usage across drivers.
+
+GPU VA
+------
+Two main goals of Xe are meeting together here:
+
+1) Have an uAPI that aligns with modern UMD needs.
+
+2) Early upstream engagement.
+
+RedHat engineers working on Nouveau proposed a new DRM feature to handle keeping
+track of GPU virtual address mappings. This is still not merged upstream, but
+this aligns very well with our goals and with our VM_BIND. The engagement with
+upstream and the port of Xe towards GPUVA is already ongoing.
+
+As a key measurable result, Xe needs to be aligned with the GPU VA and working in
+our tree. Missing Nouveau patches should *not* block Xe and any needed GPUVA
+related patch should be independent and present on dri-devel or acked by
+maintainers to go along with the first Xe pull request towards drm-next.
+
+DRM_VM_BIND
+-----------
+Nouveau, and Xe are all implementing ‘VM_BIND’ and new ‘Exec’ uAPIs in order to
+fulfill the needs of the modern uAPI. Xe merge should *not* be blocked on the
+development of a common new drm_infrastructure. However, the Xe team needs to
+engage with the community to explore the options of a common API.
+
+As a key measurable result, the DRM_VM_BIND needs to be documented in this file
+below, or this entire block deleted if the consensus is for independent drivers
+vm_bind ioctls.
+
+Although having a common DRM level IOCTL for VM_BIND is not a requirement to get
+Xe merged, it is mandatory to enforce the overall locking scheme for all major
+structs and list (so vm and vma). So, a consensus is needed, and possibly some
+common helpers. If helpers are needed, they should be also documented in this
+document.
+
+ASYNC VM_BIND
+-------------
+Although having a common DRM level IOCTL for VM_BIND is not a requirement to get
+Xe merged, it is mandatory to have a consensus with other drivers and Mesa.
+It needs to be clear how to handle async VM_BIND and interactions with userspace
+memory fences. Ideally with helper support so people don't get it wrong in all
+possible ways.
+
+As a key measurable result, the benefits of ASYNC VM_BIND and a discussion of
+various flavors, error handling and a sample API should be documented here or in
+a separate document pointed to by this document.
+
+Userptr integration and vm_bind
+-------------------------------
+Different drivers implement different ways of dealing with execution of userptr.
+With multiple drivers currently introducing support to VM_BIND, the goal is to
+aim for a DRM consensus on what’s the best way to have that support. To some
+extent this is already getting addressed itself with the GPUVA where likely the
+userptr will be a GPUVA with a NULL GEM call VM bind directly on the userptr.
+However, there are more aspects around the rules for that and the usage of
+mmu_notifiers, locking and other aspects.
+
+This task here has the goal of introducing a documentation of the basic rules.
+
+The documentation *needs* to first live in this document (API session below) and
+then moved to another more specific document or at Xe level or at DRM level.
+
+Documentation should include:
+
+ * The userptr part of the VM_BIND api.
+
+ * Locking, including the page-faulting case.
+
+ * O(1) complexity under VM_BIND.
+
+Some parts of userptr like mmu_notifiers should become GPUVA or DRM helpers when
+the second driver supporting VM_BIND+userptr appears. Details to be defined when
+the time comes.
+
+Long running compute: minimal data structure/scaffolding
+--------------------------------------------------------
+The generic scheduler code needs to include the handling of endless compute
+contexts, with the minimal scaffolding for preempt-ctx fences (probably on the
+drm_sched_entity) and making sure drm_scheduler can cope with the lack of job
+completion fence.
+
+The goal is to achieve a consensus ahead of Xe initial pull-request, ideally with
+this minimal drm/scheduler work, if needed, merged to drm-misc in a way that any
+drm driver, including Xe, could re-use and add their own individual needs on top
+in a next stage. However, this should not block the initial merge.
+
+This is a non-blocker item since the driver without the support for the long
+running compute enabled is not a showstopper.
+
+Display integration with i915
+-----------------------------
+In order to share the display code with the i915 driver so that there is maximum
+reuse, the i915/display/ code is built twice, once for i915.ko and then for
+xe.ko. Currently, the i915/display code in Xe tree is polluted with many 'ifdefs'
+depending on the build target. The goal is to refactor both Xe and i915/display
+code simultaneously in order to get a clean result before they land upstream, so
+that display can already be part of the initial pull request towards drm-next.
+
+However, display code should not gate the acceptance of Xe in upstream. Xe
+patches will be refactored in a way that display code can be removed, if needed,
+from the first pull request of Xe towards drm-next. The expectation is that when
+both drivers are part of the drm-tip, the introduction of cleaner patches will be
+easier and speed up.
+
+Drm_exec
+--------
+Helper to make dma_resv locking for a big number of buffers is getting removed in
+the drm_exec series proposed in https://patchwork.freedesktop.org/patch/524376/
+If that happens, Xe needs to change and incorporate the changes in the driver.
+The goal is to engage with the Community to understand if the best approach is to
+move that to the drivers that are using it or if we should keep the helpers in
+place waiting for Xe to get merged.
+
+This item ties into the GPUVA, VM_BIND, and even long-running compute support.
+
+As a key measurable result, we need to have a community consensus documented in
+this document and the Xe driver prepared for the changes, if necessary.
+
+Dev_coredump
+------------
+
+Xe needs to align with other drivers on the way that the error states are
+dumped, avoiding a Xe only error_state solution. The goal is to use devcoredump
+infrastructure to report error states, since it produces a standardized way
+by exposing a virtual and temporary /sys/class/devcoredump device.
+
+As the key measurable result, Xe driver needs to provide GPU snapshots captured
+at hang time through devcoredump, but without depending on any core modification
+of devcoredump infrastructure itself.
+
+Later, when we are in-tree, the goal is to collaborate with devcoredump
+infrastructure with overall possible improvements, like multiple file support
+for better organization of the dumps, snapshot support, dmesg extra print,
+and whatever may make sense and help the overall infrastructure.
+
+Xe – uAPI high level overview
+=============================
+
+...Warning: To be done in follow up patches after/when/where the main consensus in various items are individually reached.
diff --git a/Documentation/gpu/tegra.rst b/Documentation/gpu/tegra.rst
new file mode 100644
index 0000000000..d2ed8938ca
--- /dev/null
+++ b/Documentation/gpu/tegra.rst
@@ -0,0 +1,178 @@
+===============================================
+ drm/tegra NVIDIA Tegra GPU and display driver
+===============================================
+
+NVIDIA Tegra SoCs support a set of display, graphics and video functions via
+the host1x controller. host1x supplies command streams, gathered from a push
+buffer provided directly by the CPU, to its clients via channels. Software,
+or blocks amongst themselves, can use syncpoints for synchronization.
+
+Up until, but not including, Tegra124 (aka Tegra K1) the drm/tegra driver
+supports the built-in GPU, comprised of the gr2d and gr3d engines. Starting
+with Tegra124 the GPU is based on the NVIDIA desktop GPU architecture and
+supported by the drm/nouveau driver.
+
+The drm/tegra driver supports NVIDIA Tegra SoC generations since Tegra20. It
+has three parts:
+
+  - A host1x driver that provides infrastructure and access to the host1x
+    services.
+
+  - A KMS driver that supports the display controllers as well as a number of
+    outputs, such as RGB, HDMI, DSI, and DisplayPort.
+
+  - A set of custom userspace IOCTLs that can be used to submit jobs to the
+    GPU and video engines via host1x.
+
+Driver Infrastructure
+=====================
+
+The various host1x clients need to be bound together into a logical device in
+order to expose their functionality to users. The infrastructure that supports
+this is implemented in the host1x driver. When a driver is registered with the
+infrastructure it provides a list of compatible strings specifying the devices
+that it needs. The infrastructure creates a logical device and scan the device
+tree for matching device nodes, adding the required clients to a list. Drivers
+for individual clients register with the infrastructure as well and are added
+to the logical host1x device.
+
+Once all clients are available, the infrastructure will initialize the logical
+device using a driver-provided function which will set up the bits specific to
+the subsystem and in turn initialize each of its clients.
+
+Similarly, when one of the clients is unregistered, the infrastructure will
+destroy the logical device by calling back into the driver, which ensures that
+the subsystem specific bits are torn down and the clients destroyed in turn.
+
+Host1x Infrastructure Reference
+-------------------------------
+
+.. kernel-doc:: include/linux/host1x.h
+
+.. kernel-doc:: drivers/gpu/host1x/bus.c
+   :export:
+
+Host1x Syncpoint Reference
+--------------------------
+
+.. kernel-doc:: drivers/gpu/host1x/syncpt.c
+   :export:
+
+KMS driver
+==========
+
+The display hardware has remained mostly backwards compatible over the various
+Tegra SoC generations, up until Tegra186 which introduces several changes that
+make it difficult to support with a parameterized driver.
+
+Display Controllers
+-------------------
+
+Tegra SoCs have two display controllers, each of which can be associated with
+zero or more outputs. Outputs can also share a single display controller, but
+only if they run with compatible display timings. Two display controllers can
+also share a single framebuffer, allowing cloned configurations even if modes
+on two outputs don't match. A display controller is modelled as a CRTC in KMS
+terms.
+
+On Tegra186, the number of display controllers has been increased to three. A
+display controller can no longer drive all of the outputs. While two of these
+controllers can drive both DSI outputs and both SOR outputs, the third cannot
+drive any DSI.
+
+Windows
+~~~~~~~
+
+A display controller controls a set of windows that can be used to composite
+multiple buffers onto the screen. While it is possible to assign arbitrary Z
+ordering to individual windows (by programming the corresponding blending
+registers), this is currently not supported by the driver. Instead, it will
+assume a fixed Z ordering of the windows (window A is the root window, that
+is, the lowest, while windows B and C are overlaid on top of window A). The
+overlay windows support multiple pixel formats and can automatically convert
+from YUV to RGB at scanout time. This makes them useful for displaying video
+content. In KMS, each window is modelled as a plane. Each display controller
+has a hardware cursor that is exposed as a cursor plane.
+
+Outputs
+-------
+
+The type and number of supported outputs varies between Tegra SoC generations.
+All generations support at least HDMI. While earlier generations supported the
+very simple RGB interfaces (one per display controller), recent generations no
+longer do and instead provide standard interfaces such as DSI and eDP/DP.
+
+Outputs are modelled as a composite encoder/connector pair.
+
+RGB/LVDS
+~~~~~~~~
+
+This interface is no longer available since Tegra124. It has been replaced by
+the more standard DSI and eDP interfaces.
+
+HDMI
+~~~~
+
+HDMI is supported on all Tegra SoCs. Starting with Tegra210, HDMI is provided
+by the versatile SOR output, which supports eDP, DP and HDMI. The SOR is able
+to support HDMI 2.0, though support for this is currently not merged.
+
+DSI
+~~~
+
+Although Tegra has supported DSI since Tegra30, the controller has changed in
+several ways in Tegra114. Since none of the publicly available development
+boards prior to Dalmore (Tegra114) have made use of DSI, only Tegra114 and
+later are supported by the drm/tegra driver.
+
+eDP/DP
+~~~~~~
+
+eDP was first introduced in Tegra124 where it was used to drive the display
+panel for notebook form factors. Tegra210 added support for full DisplayPort
+support, though this is currently not implemented in the drm/tegra driver.
+
+Userspace Interface
+===================
+
+The userspace interface provided by drm/tegra allows applications to create
+GEM buffers, access and control syncpoints as well as submit command streams
+to host1x.
+
+GEM Buffers
+-----------
+
+The ``DRM_IOCTL_TEGRA_GEM_CREATE`` IOCTL is used to create a GEM buffer object
+with Tegra-specific flags. This is useful for buffers that should be tiled, or
+that are to be scanned out upside down (useful for 3D content).
+
+After a GEM buffer object has been created, its memory can be mapped by an
+application using the mmap offset returned by the ``DRM_IOCTL_TEGRA_GEM_MMAP``
+IOCTL.
+
+Syncpoints
+----------
+
+The current value of a syncpoint can be obtained by executing the
+``DRM_IOCTL_TEGRA_SYNCPT_READ`` IOCTL. Incrementing the syncpoint is achieved
+using the ``DRM_IOCTL_TEGRA_SYNCPT_INCR`` IOCTL.
+
+Userspace can also request blocking on a syncpoint. To do so, it needs to
+execute the ``DRM_IOCTL_TEGRA_SYNCPT_WAIT`` IOCTL, specifying the value of
+the syncpoint to wait for. The kernel will release the application when the
+syncpoint reaches that value or after a specified timeout.
+
+Command Stream Submission
+-------------------------
+
+Before an application can submit command streams to host1x it needs to open a
+channel to an engine using the ``DRM_IOCTL_TEGRA_OPEN_CHANNEL`` IOCTL. Client
+IDs are used to identify the target of the channel. When a channel is no
+longer needed, it can be closed using the ``DRM_IOCTL_TEGRA_CLOSE_CHANNEL``
+IOCTL. To retrieve the syncpoint associated with a channel, an application
+can use the ``DRM_IOCTL_TEGRA_GET_SYNCPT``.
+
+After opening a channel, submitting command streams is easy. The application
+writes commands into the memory backing a GEM buffer object and passes these
+to the ``DRM_IOCTL_TEGRA_SUBMIT`` IOCTL along with various other parameters,
+such as the syncpoints or relocations used in the job submission.
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
new file mode 100644
index 0000000000..85bbe05436
--- /dev/null
+++ b/Documentation/gpu/todo.rst
@@ -0,0 +1,797 @@
+.. _todo:
+
+=========
+TODO list
+=========
+
+This section contains a list of smaller janitorial tasks in the kernel DRM
+graphics subsystem useful as newbie projects. Or for slow rainy days.
+
+Difficulty
+----------
+
+To make it easier task are categorized into different levels:
+
+Starter: Good tasks to get started with the DRM subsystem.
+
+Intermediate: Tasks which need some experience with working in the DRM
+subsystem, or some specific GPU/display graphics knowledge. For debugging issue
+it's good to have the relevant hardware (or a virtual driver set up) available
+for testing.
+
+Advanced: Tricky tasks that need fairly good understanding of the DRM subsystem
+and graphics topics. Generally need the relevant hardware for development and
+testing.
+
+Expert: Only attempt these if you've successfully completed some tricky
+refactorings already and are an expert in the specific area
+
+Subsystem-wide refactorings
+===========================
+
+Remove custom dumb_map_offset implementations
+---------------------------------------------
+
+All GEM based drivers should be using drm_gem_create_mmap_offset() instead.
+Audit each individual driver, make sure it'll work with the generic
+implementation (there's lots of outdated locking leftovers in various
+implementations), and then remove it.
+
+Contact: Daniel Vetter, respective driver maintainers
+
+Level: Intermediate
+
+Convert existing KMS drivers to atomic modesetting
+--------------------------------------------------
+
+3.19 has the atomic modeset interfaces and helpers, so drivers can now be
+converted over. Modern compositors like Wayland or Surfaceflinger on Android
+really want an atomic modeset interface, so this is all about the bright
+future.
+
+There is a conversion guide for atomic [1]_ and all you need is a GPU for a
+non-converted driver.  The "Atomic mode setting design overview" series [2]_
+[3]_ at LWN.net can also be helpful.
+
+As part of this drivers also need to convert to universal plane (which means
+exposing primary & cursor as proper plane objects). But that's much easier to
+do by directly using the new atomic helper driver callbacks.
+
+  .. [1] https://blog.ffwll.ch/2014/11/atomic-modeset-support-for-kms-drivers.html
+  .. [2] https://lwn.net/Articles/653071/
+  .. [3] https://lwn.net/Articles/653466/
+
+Contact: Daniel Vetter, respective driver maintainers
+
+Level: Advanced
+
+Clean up the clipped coordination confusion around planes
+---------------------------------------------------------
+
+We have a helper to get this right with drm_plane_helper_check_update(), but
+it's not consistently used. This should be fixed, preferably in the atomic
+helpers (and drivers then moved over to clipped coordinates). Probably the
+helper should also be moved from drm_plane_helper.c to the atomic helpers, to
+avoid confusion - the other helpers in that file are all deprecated legacy
+helpers.
+
+Contact: Ville Syrjälä, Daniel Vetter, driver maintainers
+
+Level: Advanced
+
+Improve plane atomic_check helpers
+----------------------------------
+
+Aside from the clipped coordinates right above there's a few suboptimal things
+with the current helpers:
+
+- drm_plane_helper_funcs->atomic_check gets called for enabled or disabled
+  planes. At best this seems to confuse drivers, worst it means they blow up
+  when the plane is disabled without the CRTC. The only special handling is
+  resetting values in the plane state structures, which instead should be moved
+  into the drm_plane_funcs->atomic_duplicate_state functions.
+
+- Once that's done, helpers could stop calling ->atomic_check for disabled
+  planes.
+
+- Then we could go through all the drivers and remove the more-or-less confused
+  checks for plane_state->fb and plane_state->crtc.
+
+Contact: Daniel Vetter
+
+Level: Advanced
+
+Convert early atomic drivers to async commit helpers
+----------------------------------------------------
+
+For the first year the atomic modeset helpers didn't support asynchronous /
+nonblocking commits, and every driver had to hand-roll them. This is fixed
+now, but there's still a pile of existing drivers that easily could be
+converted over to the new infrastructure.
+
+One issue with the helpers is that they require that drivers handle completion
+events for atomic commits correctly. But fixing these bugs is good anyway.
+
+Somewhat related is the legacy_cursor_update hack, which should be replaced with
+the new atomic_async_check/commit functionality in the helpers in drivers that
+still look at that flag.
+
+Contact: Daniel Vetter, respective driver maintainers
+
+Level: Advanced
+
+Fallout from atomic KMS
+-----------------------
+
+``drm_atomic_helper.c`` provides a batch of functions which implement legacy
+IOCTLs on top of the new atomic driver interface. Which is really nice for
+gradual conversion of drivers, but unfortunately the semantic mismatches are
+a bit too severe. So there's some follow-up work to adjust the function
+interfaces to fix these issues:
+
+* atomic needs the lock acquire context. At the moment that's passed around
+  implicitly with some horrible hacks, and it's also allocate with
+  ``GFP_NOFAIL`` behind the scenes. All legacy paths need to start allocating
+  the acquire context explicitly on stack and then also pass it down into
+  drivers explicitly so that the legacy-on-atomic functions can use them.
+
+  Except for some driver code this is done. This task should be finished by
+  adding WARN_ON(!drm_drv_uses_atomic_modeset) in drm_modeset_lock_all().
+
+* A bunch of the vtable hooks are now in the wrong place: DRM has a split
+  between core vfunc tables (named ``drm_foo_funcs``), which are used to
+  implement the userspace ABI. And then there's the optional hooks for the
+  helper libraries (name ``drm_foo_helper_funcs``), which are purely for
+  internal use. Some of these hooks should be move from ``_funcs`` to
+  ``_helper_funcs`` since they are not part of the core ABI. There's a
+  ``FIXME`` comment in the kerneldoc for each such case in ``drm_crtc.h``.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Get rid of dev->struct_mutex from GEM drivers
+---------------------------------------------
+
+``dev->struct_mutex`` is the Big DRM Lock from legacy days and infested
+everything. Nowadays in modern drivers the only bit where it's mandatory is
+serializing GEM buffer object destruction. Which unfortunately means drivers
+have to keep track of that lock and either call ``unreference`` or
+``unreference_locked`` depending upon context.
+
+Core GEM doesn't have a need for ``struct_mutex`` any more since kernel 4.8,
+and there's a GEM object ``free`` callback for any drivers which are
+entirely ``struct_mutex`` free.
+
+For drivers that need ``struct_mutex`` it should be replaced with a driver-
+private lock. The tricky part is the BO free functions, since those can't
+reliably take that lock any more. Instead state needs to be protected with
+suitable subordinate locks or some cleanup work pushed to a worker thread. For
+performance-critical drivers it might also be better to go with a more
+fine-grained per-buffer object and per-context lockings scheme. Currently only
+the ``msm`` and `i915` drivers use ``struct_mutex``.
+
+Contact: Daniel Vetter, respective driver maintainers
+
+Level: Advanced
+
+Move Buffer Object Locking to dma_resv_lock()
+---------------------------------------------
+
+Many drivers have their own per-object locking scheme, usually using
+mutex_lock(). This causes all kinds of trouble for buffer sharing, since
+depending which driver is the exporter and importer, the locking hierarchy is
+reversed.
+
+To solve this we need one standard per-object locking mechanism, which is
+dma_resv_lock(). This lock needs to be called as the outermost lock, with all
+other driver specific per-object locks removed. The problem is that rolling out
+the actual change to the locking contract is a flag day, due to struct dma_buf
+buffer sharing.
+
+Level: Expert
+
+Convert logging to drm_* functions with drm_device parameter
+------------------------------------------------------------
+
+For drivers which could have multiple instances, it is necessary to
+differentiate between which is which in the logs. Since DRM_INFO/WARN/ERROR
+don't do this, drivers used dev_info/warn/err to make this differentiation. We
+now have drm_* variants of the drm print functions, so we can start to convert
+those drivers back to using drm-formatted specific log messages.
+
+Before you start this conversion please contact the relevant maintainers to make
+sure your work will be merged - not everyone agrees that the DRM dmesg macros
+are better.
+
+Contact: Sean Paul, Maintainer of the driver you plan to convert
+
+Level: Starter
+
+Convert drivers to use simple modeset suspend/resume
+----------------------------------------------------
+
+Most drivers (except i915 and nouveau) that use
+drm_atomic_helper_suspend/resume() can probably be converted to use
+drm_mode_config_helper_suspend/resume(). Also there's still open-coded version
+of the atomic suspend/resume code in older atomic modeset drivers.
+
+Contact: Maintainer of the driver you plan to convert
+
+Level: Intermediate
+
+Convert drivers to use drm_fbdev_generic_setup()
+------------------------------------------------
+
+Most drivers can use drm_fbdev_generic_setup(). Driver have to implement
+atomic modesetting and GEM vmap support. Historically, generic fbdev emulation
+expected the framebuffer in system memory or system-like memory. By employing
+struct iosys_map, drivers with frambuffers in I/O memory can be supported
+as well.
+
+Contact: Maintainer of the driver you plan to convert
+
+Level: Intermediate
+
+Reimplement functions in drm_fbdev_fb_ops without fbdev
+-------------------------------------------------------
+
+A number of callback functions in drm_fbdev_fb_ops could benefit from
+being rewritten without dependencies on the fbdev module. Some of the
+helpers could further benefit from using struct iosys_map instead of
+raw pointers.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>, Daniel Vetter
+
+Level: Advanced
+
+Benchmark and optimize blitting and format-conversion function
+--------------------------------------------------------------
+
+Drawing to display memory quickly is crucial for many applications'
+performance.
+
+On at least x86-64, sys_imageblit() is significantly slower than
+cfb_imageblit(), even though both use the same blitting algorithm and
+the latter is written for I/O memory. It turns out that cfb_imageblit()
+uses movl instructions, while sys_imageblit apparently does not. This
+seems to be a problem with gcc's optimizer. DRM's format-conversion
+helpers might be subject to similar issues.
+
+Benchmark and optimize fbdev's sys_() helpers and DRM's format-conversion
+helpers. In cases that can be further optimized, maybe implement a different
+algorithm. For micro-optimizations, use movl/movq instructions explicitly.
+That might possibly require architecture-specific helpers (e.g., storel()
+storeq()).
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Intermediate
+
+drm_framebuffer_funcs and drm_mode_config_funcs.fb_create cleanup
+-----------------------------------------------------------------
+
+A lot more drivers could be switched over to the drm_gem_framebuffer helpers.
+Various hold-ups:
+
+- Need to switch over to the generic dirty tracking code using
+  drm_atomic_helper_dirtyfb first (e.g. qxl).
+
+- Need to switch to drm_fbdev_generic_setup(), otherwise a lot of the custom fb
+  setup code can't be deleted.
+
+- Need to switch to drm_gem_fb_create(), as now drm_gem_fb_create() checks for
+  valid formats for atomic drivers.
+
+- Many drivers subclass drm_framebuffer, we'd need a embedding compatible
+  version of the varios drm_gem_fb_create functions. Maybe called
+  drm_gem_fb_create/_with_dirty/_with_funcs as needed.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Generic fbdev defio support
+---------------------------
+
+The defio support code in the fbdev core has some very specific requirements,
+which means drivers need to have a special framebuffer for fbdev. The main
+issue is that it uses some fields in struct page itself, which breaks shmem
+gem objects (and other things). To support defio, affected drivers require
+the use of a shadow buffer, which may add CPU and memory overhead.
+
+Possible solution would be to write our own defio mmap code in the drm fbdev
+emulation. It would need to fully wrap the existing mmap ops, forwarding
+everything after it has done the write-protect/mkwrite trickery:
+
+- In the drm_fbdev_fb_mmap helper, if we need defio, change the
+  default page prots to write-protected with something like this::
+
+      vma->vm_page_prot = pgprot_wrprotect(vma->vm_page_prot);
+
+- Set the mkwrite and fsync callbacks with similar implementions to the core
+  fbdev defio stuff. These should all work on plain ptes, they don't actually
+  require a struct page.  uff. These should all work on plain ptes, they don't
+  actually require a struct page.
+
+- Track the dirty pages in a separate structure (bitfield with one bit per page
+  should work) to avoid clobbering struct page.
+
+Might be good to also have some igt testcases for this.
+
+Contact: Daniel Vetter, Noralf Tronnes
+
+Level: Advanced
+
+connector register/unregister fixes
+-----------------------------------
+
+- For most connectors it's a no-op to call drm_connector_register/unregister
+  directly from driver code, drm_dev_register/unregister take care of this
+  already. We can remove all of them.
+
+- For dp drivers it's a bit more a mess, since we need the connector to be
+  registered when calling drm_dp_aux_register. Fix this by instead calling
+  drm_dp_aux_init, and moving the actual registering into a late_register
+  callback as recommended in the kerneldoc.
+
+Level: Intermediate
+
+Remove load/unload callbacks
+----------------------------
+
+The load/unload callbacks in struct &drm_driver are very much midlayers, plus
+for historical reasons they get the ordering wrong (and we can't fix that)
+between setting up the &drm_driver structure and calling drm_dev_register().
+
+- Rework drivers to no longer use the load/unload callbacks, directly coding the
+  load/unload sequence into the driver's probe function.
+
+- Once all drivers are converted, remove the load/unload callbacks.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Replace drm_detect_hdmi_monitor() with drm_display_info.is_hdmi
+---------------------------------------------------------------
+
+Once EDID is parsed, the monitor HDMI support information is available through
+drm_display_info.is_hdmi. Many drivers still call drm_detect_hdmi_monitor() to
+retrieve the same information, which is less efficient.
+
+Audit each individual driver calling drm_detect_hdmi_monitor() and switch to
+drm_display_info.is_hdmi if applicable.
+
+Contact: Laurent Pinchart, respective driver maintainers
+
+Level: Intermediate
+
+Consolidate custom driver modeset properties
+--------------------------------------------
+
+Before atomic modeset took place, many drivers where creating their own
+properties. Among other things, atomic brought the requirement that custom,
+driver specific properties should not be used.
+
+For this task, we aim to introduce core helpers or reuse the existing ones
+if available:
+
+A quick, unconfirmed, examples list.
+
+Introduce core helpers:
+- audio (amdgpu, intel, gma500, radeon)
+- brightness, contrast, etc (armada, nouveau) - overlay only (?)
+- broadcast rgb (gma500, intel)
+- colorkey (armada, nouveau, rcar) - overlay only (?)
+- dither (amdgpu, nouveau, radeon) - varies across drivers
+- underscan family (amdgpu, radeon, nouveau)
+
+Already in core:
+- colorspace (sti)
+- tv format names, enhancements (gma500, intel)
+- tv overscan, margins, etc. (gma500, intel)
+- zorder (omapdrm) - same as zpos (?)
+
+
+Contact: Emil Velikov, respective driver maintainers
+
+Level: Intermediate
+
+Use struct iosys_map throughout codebase
+----------------------------------------
+
+Pointers to shared device memory are stored in struct iosys_map. Each
+instance knows whether it refers to system or I/O memory. Most of the DRM-wide
+interface have been converted to use struct iosys_map, but implementations
+often still use raw pointers.
+
+The task is to use struct iosys_map where it makes sense.
+
+* Memory managers should use struct iosys_map for dma-buf-imported buffers.
+* TTM might benefit from using struct iosys_map internally.
+* Framebuffer copying and blitting helpers should operate on struct iosys_map.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>, Christian König, Daniel Vetter
+
+Level: Intermediate
+
+Review all drivers for setting struct drm_mode_config.{max_width,max_height} correctly
+--------------------------------------------------------------------------------------
+
+The values in struct drm_mode_config.{max_width,max_height} describe the
+maximum supported framebuffer size. It's the virtual screen size, but many
+drivers treat it like limitations of the physical resolution.
+
+The maximum width depends on the hardware's maximum scanline pitch. The
+maximum height depends on the amount of addressable video memory. Review all
+drivers to initialize the fields to the correct values.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Intermediate
+
+Request memory regions in all drivers
+-------------------------------------
+
+Go through all drivers and add code to request the memory regions that the
+driver uses. This requires adding calls to request_mem_region(),
+pci_request_region() or similar functions. Use helpers for managed cleanup
+where possible.
+
+Drivers are pretty bad at doing this and there used to be conflicts among
+DRM and fbdev drivers. Still, it's the correct thing to do.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Starter
+
+Remove driver dependencies on FB_DEVICE
+---------------------------------------
+
+A number of fbdev drivers provide attributes via sysfs and therefore depend
+on CONFIG_FB_DEVICE to be selected. Review each driver and attempt to make
+any dependencies on CONFIG_FB_DEVICE optional. At the minimum, the respective
+code in the driver could be conditionalized via ifdef CONFIG_FB_DEVICE. Not
+all drivers might be able to drop CONFIG_FB_DEVICE.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Starter
+
+Clean up checks for already prepared/enabled in panels
+------------------------------------------------------
+
+In a whole pile of panel drivers, we have code to make the
+prepare/unprepare/enable/disable callbacks behave as no-ops if they've already
+been called. To get some idea of the duplicated code, try::
+
+  git grep 'if.*>prepared' -- drivers/gpu/drm/panel
+  git grep 'if.*>enabled' -- drivers/gpu/drm/panel
+
+In the patch ("drm/panel: Check for already prepared/enabled in drm_panel")
+we've moved this check to the core. Now we can most definitely remove the
+check from the individual panels and save a pile of code.
+
+In adition to removing the check from the individual panels, it is believed
+that even the core shouldn't need this check and that should be considered
+an error if other code ever relies on this check. The check in the core
+currently prints a warning whenever something is relying on this check with
+dev_warn(). After a little while, we likely want to promote this to a
+WARN(1) to help encourage folks not to rely on this behavior.
+
+Contact: Douglas Anderson <dianders@chromium.org>
+
+Level: Starter/Intermediate
+
+
+Core refactorings
+=================
+
+Make panic handling work
+------------------------
+
+This is a really varied tasks with lots of little bits and pieces:
+
+* The panic path can't be tested currently, leading to constant breaking. The
+  main issue here is that panics can be triggered from hardirq contexts and
+  hence all panic related callback can run in hardirq context. It would be
+  awesome if we could test at least the fbdev helper code and driver code by
+  e.g. trigger calls through drm debugfs files. hardirq context could be
+  achieved by using an IPI to the local processor.
+
+* There's a massive confusion of different panic handlers. DRM fbdev emulation
+  helpers had their own (long removed), but on top of that the fbcon code itself
+  also has one. We need to make sure that they stop fighting over each other.
+  This is worked around by checking ``oops_in_progress`` at various entry points
+  into the DRM fbdev emulation helpers. A much cleaner approach here would be to
+  switch fbcon to the `threaded printk support
+  <https://lwn.net/Articles/800946/>`_.
+
+* ``drm_can_sleep()`` is a mess. It hides real bugs in normal operations and
+  isn't a full solution for panic paths. We need to make sure that it only
+  returns true if there's a panic going on for real, and fix up all the
+  fallout.
+
+* The panic handler must never sleep, which also means it can't ever
+  ``mutex_lock()``. Also it can't grab any other lock unconditionally, not
+  even spinlocks (because NMI and hardirq can panic too). We need to either
+  make sure to not call such paths, or trylock everything. Really tricky.
+
+* A clean solution would be an entirely separate panic output support in KMS,
+  bypassing the current fbcon support. See `[PATCH v2 0/3] drm: Add panic handling
+  <https://lore.kernel.org/dri-devel/20190311174218.51899-1-noralf@tronnes.org/>`_.
+
+* Encoding the actual oops and preceding dmesg in a QR might help with the
+  dread "important stuff scrolled away" problem. See `[RFC][PATCH] Oops messages
+  transfer using QR codes
+  <https://lore.kernel.org/lkml/1446217392-11981-1-git-send-email-alexandru.murtaza@intel.com/>`_
+  for some example code that could be reused.
+
+Contact: Daniel Vetter
+
+Level: Advanced
+
+Clean up the debugfs support
+----------------------------
+
+There's a bunch of issues with it:
+
+- Convert drivers to support the drm_debugfs_add_files() function instead of
+  the drm_debugfs_create_files() function.
+
+- Improve late-register debugfs by rolling out the same debugfs pre-register
+  infrastructure for connector and crtc too. That way, the drivers won't need to
+  split their setup code into init and register anymore.
+
+- We probably want to have some support for debugfs files on crtc/connectors and
+  maybe other kms objects directly in core. There's even drm_print support in
+  the funcs for these objects to dump kms state, so it's all there. And then the
+  ->show() functions should obviously give you a pointer to the right object.
+
+- The drm_driver->debugfs_init hooks we have is just an artifact of the old
+  midlayered load sequence. DRM debugfs should work more like sysfs, where you
+  can create properties/files for an object anytime you want, and the core
+  takes care of publishing/unpuplishing all the files at register/unregister
+  time. Drivers shouldn't need to worry about these technicalities, and fixing
+  this (together with the drm_minor->drm_device move) would allow us to remove
+  debugfs_init.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Object lifetime fixes
+---------------------
+
+There's two related issues here
+
+- Cleanup up the various ->destroy callbacks, which often are all the same
+  simple code.
+
+- Lots of drivers erroneously allocate DRM modeset objects using devm_kzalloc,
+  which results in use-after free issues on driver unload. This can be serious
+  trouble even for drivers for hardware integrated on the SoC due to
+  EPROBE_DEFERRED backoff.
+
+Both these problems can be solved by switching over to drmm_kzalloc(), and the
+various convenience wrappers provided, e.g. drmm_crtc_alloc_with_planes(),
+drmm_universal_plane_alloc(), ... and so on.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Remove automatic page mapping from dma-buf importing
+----------------------------------------------------
+
+When importing dma-bufs, the dma-buf and PRIME frameworks automatically map
+imported pages into the importer's DMA area. drm_gem_prime_fd_to_handle() and
+drm_gem_prime_handle_to_fd() require that importers call dma_buf_attach()
+even if they never do actual device DMA, but only CPU access through
+dma_buf_vmap(). This is a problem for USB devices, which do not support DMA
+operations.
+
+To fix the issue, automatic page mappings should be removed from the
+buffer-sharing code. Fixing this is a bit more involved, since the import/export
+cache is also tied to &drm_gem_object.import_attach. Meanwhile we paper over
+this problem for USB devices by fishing out the USB host controller device, as
+long as that supports DMA. Otherwise importing can still needlessly fail.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>, Daniel Vetter
+
+Level: Advanced
+
+
+Better Testing
+==============
+
+Add unit tests using the Kernel Unit Testing (KUnit) framework
+--------------------------------------------------------------
+
+The `KUnit <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_
+provides a common framework for unit tests within the Linux kernel. Having a
+test suite would allow to identify regressions earlier.
+
+A good candidate for the first unit tests are the format-conversion helpers in
+``drm_format_helper.c``.
+
+Contact: Javier Martinez Canillas <javierm@redhat.com>
+
+Level: Intermediate
+
+Enable trinity for DRM
+----------------------
+
+And fix up the fallout. Should be really interesting ...
+
+Level: Advanced
+
+Make KMS tests in i-g-t generic
+-------------------------------
+
+The i915 driver team maintains an extensive testsuite for the i915 DRM driver,
+including tons of testcases for corner-cases in the modesetting API. It would
+be awesome if those tests (at least the ones not relying on Intel-specific GEM
+features) could be made to run on any KMS driver.
+
+Basic work to run i-g-t tests on non-i915 is done, what's now missing is mass-
+converting things over. For modeset tests we also first need a bit of
+infrastructure to use dumb buffers for untiled buffers, to be able to run all
+the non-i915 specific modeset tests.
+
+Level: Advanced
+
+Extend virtual test driver (VKMS)
+---------------------------------
+
+See the documentation of :ref:`VKMS <vkms>` for more details. This is an ideal
+internship task, since it only requires a virtual machine and can be sized to
+fit the available time.
+
+Level: See details
+
+Backlight Refactoring
+---------------------
+
+Backlight drivers have a triple enable/disable state, which is a bit overkill.
+Plan to fix this:
+
+1. Roll out backlight_enable() and backlight_disable() helpers everywhere. This
+   has started already.
+2. In all, only look at one of the three status bits set by the above helpers.
+3. Remove the other two status bits.
+
+Contact: Daniel Vetter
+
+Level: Intermediate
+
+Driver Specific
+===============
+
+AMD DC Display Driver
+---------------------
+
+AMD DC is the display driver for AMD devices starting with Vega. There has been
+a bunch of progress cleaning it up but there's still plenty of work to be done.
+
+See drivers/gpu/drm/amd/display/TODO for tasks.
+
+Contact: Harry Wentland, Alex Deucher
+
+Bootsplash
+==========
+
+There is support in place now for writing internal DRM clients making it
+possible to pick up the bootsplash work that was rejected because it was written
+for fbdev.
+
+- [v6,8/8] drm/client: Hack: Add bootsplash example
+  https://patchwork.freedesktop.org/patch/306579/
+
+- [RFC PATCH v2 00/13] Kernel based bootsplash
+  https://lore.kernel.org/r/20171213194755.3409-1-mstaudt@suse.de
+
+Contact: Sam Ravnborg
+
+Level: Advanced
+
+Brightness handling on devices with multiple internal panels
+============================================================
+
+On x86/ACPI devices there can be multiple backlight firmware interfaces:
+(ACPI) video, vendor specific and others. As well as direct/native (PWM)
+register programming by the KMS driver.
+
+To deal with this backlight drivers used on x86/ACPI call
+acpi_video_get_backlight_type() which has heuristics (+quirks) to select
+which backlight interface to use; and backlight drivers which do not match
+the returned type will not register themselves, so that only one backlight
+device gets registered (in a single GPU setup, see below).
+
+At the moment this more or less assumes that there will only
+be 1 (internal) panel on a system.
+
+On systems with 2 panels this may be a problem, depending on
+what interface acpi_video_get_backlight_type() selects:
+
+1. native: in this case the KMS driver is expected to know which backlight
+   device belongs to which output so everything should just work.
+2. video: this does support controlling multiple backlights, but some work
+   will need to be done to get the output <-> backlight device mapping
+
+The above assumes both panels will require the same backlight interface type.
+Things will break on systems with multiple panels where the 2 panels need
+a different type of control. E.g. one panel needs ACPI video backlight control,
+where as the other is using native backlight control. Currently in this case
+only one of the 2 required backlight devices will get registered, based on
+the acpi_video_get_backlight_type() return value.
+
+If this (theoretical) case ever shows up, then supporting this will need some
+work. A possible solution here would be to pass a device and connector-name
+to acpi_video_get_backlight_type() so that it can deal with this.
+
+Note in a way we already have a case where userspace sees 2 panels,
+in dual GPU laptop setups with a mux. On those systems we may see
+either 2 native backlight devices; or 2 native backlight devices.
+
+Userspace already has code to deal with this by detecting if the related
+panel is active (iow which way the mux between the GPU and the panels
+points) and then uses that backlight device. Userspace here very much
+assumes a single panel though. It picks only 1 of the 2 backlight devices
+and then only uses that one.
+
+Note that all userspace code (that I know off) is currently hardcoded
+to assume a single panel.
+
+Before the recent changes to not register multiple (e.g. video + native)
+/sys/class/backlight devices for a single panel (on a single GPU laptop),
+userspace would see multiple backlight devices all controlling the same
+backlight.
+
+To deal with this userspace had to always picks one preferred device under
+/sys/class/backlight and will ignore the others. So to support brightness
+control on multiple panels userspace will need to be updated too.
+
+There are plans to allow brightness control through the KMS API by adding
+a "display brightness" property to drm_connector objects for panels. This
+solves a number of issues with the /sys/class/backlight API, including not
+being able to map a sysfs backlight device to a specific connector. Any
+userspace changes to add support for brightness control on devices with
+multiple panels really should build on top of this new KMS property.
+
+Contact: Hans de Goede
+
+Level: Advanced
+
+Outside DRM
+===========
+
+Convert fbdev drivers to DRM
+----------------------------
+
+There are plenty of fbdev drivers for older hardware. Some hardware has
+become obsolete, but some still provides good(-enough) framebuffers. The
+drivers that are still useful should be converted to DRM and afterwards
+removed from fbdev.
+
+Very simple fbdev drivers can best be converted by starting with a new
+DRM driver. Simple KMS helpers and SHMEM should be able to handle any
+existing hardware. The new driver's call-back functions are filled from
+existing fbdev code.
+
+More complex fbdev drivers can be refactored step-by-step into a DRM
+driver with the help of the DRM fbconv helpers [4]_. These helpers provide
+the transition layer between the DRM core infrastructure and the fbdev
+driver interface. Create a new DRM driver on top of the fbconv helpers,
+copy over the fbdev driver, and hook it up to the DRM code. Examples for
+several fbdev drivers are available in Thomas Zimmermann's fbconv tree
+[4]_, as well as a tutorial of this process [5]_. The result is a primitive
+DRM driver that can run X11 and Weston.
+
+ .. [4] https://gitlab.freedesktop.org/tzimmermann/linux/tree/fbconv
+ .. [5] https://gitlab.freedesktop.org/tzimmermann/linux/blob/fbconv/drivers/gpu/drm/drm_fbconv_helper.c
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Advanced
diff --git a/Documentation/gpu/tve200.rst b/Documentation/gpu/tve200.rst
new file mode 100644
index 0000000000..152ea9398f
--- /dev/null
+++ b/Documentation/gpu/tve200.rst
@@ -0,0 +1,6 @@
+==================================
+ drm/tve200 Faraday TV Encoder 200
+==================================
+
+.. kernel-doc:: drivers/gpu/drm/tve200/tve200_drv.c
+   :doc: Faraday TV Encoder TVE200 DRM Driver
diff --git a/Documentation/gpu/v3d.rst b/Documentation/gpu/v3d.rst
new file mode 100644
index 0000000000..543f7fbf52
--- /dev/null
+++ b/Documentation/gpu/v3d.rst
@@ -0,0 +1,28 @@
+=====================================
+ drm/v3d Broadcom V3D Graphics Driver
+=====================================
+
+.. kernel-doc:: drivers/gpu/drm/v3d/v3d_drv.c
+   :doc: Broadcom V3D Graphics Driver
+
+GPU buffer object (BO) management
+---------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/v3d/v3d_bo.c
+   :doc: V3D GEM BO management support
+
+Address space management
+===========================================
+.. kernel-doc:: drivers/gpu/drm/v3d/v3d_mmu.c
+   :doc: Broadcom V3D MMU
+
+GPU Scheduling
+===========================================
+.. kernel-doc:: drivers/gpu/drm/v3d/v3d_sched.c
+   :doc: Broadcom V3D scheduling
+
+Interrupts
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/v3d/v3d_irq.c
+   :doc: Interrupt management for the V3D engine
diff --git a/Documentation/gpu/vc4.rst b/Documentation/gpu/vc4.rst
new file mode 100644
index 0000000000..5e5e92e409
--- /dev/null
+++ b/Documentation/gpu/vc4.rst
@@ -0,0 +1,108 @@
+=====================================
+ drm/vc4 Broadcom VC4 Graphics Driver
+=====================================
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_drv.c
+   :doc: Broadcom VC4 Graphics Driver
+
+Display Hardware Handling
+=========================
+
+This section covers everything related to the display hardware including
+the mode setting infrastructure, plane, sprite and cursor handling and
+display, output probing and related topics.
+
+Pixel Valve (DRM CRTC)
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_crtc.c
+   :doc: VC4 CRTC module
+
+HVS
+---
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_hvs.c
+   :doc: VC4 HVS module.
+
+HVS planes
+----------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_plane.c
+   :doc: VC4 plane module
+
+HDMI encoder
+------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_hdmi.c
+   :doc: VC4 Falcon HDMI module
+
+DSI encoder
+-----------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_dsi.c
+   :doc: VC4 DSI0/DSI1 module
+
+DPI encoder
+-----------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_dpi.c
+   :doc: VC4 DPI module
+
+VEC (Composite TV out) encoder
+------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_vec.c
+   :doc: VC4 SDTV module
+
+KUnit Tests
+===========
+
+The VC4 Driver uses KUnit to perform driver-specific unit and
+integration tests.
+
+These tests are using a mock driver and can be ran using the
+command below, on either arm or arm64 architectures,
+
+.. code-block:: bash
+
+	$ ./tools/testing/kunit/kunit.py run \
+		--kunitconfig=drivers/gpu/drm/vc4/tests/.kunitconfig \
+		--cross_compile aarch64-linux-gnu- --arch arm64
+
+Parts of the driver that are currently covered by tests are:
+ * The HVS to PixelValve dynamic FIFO assignment, for the BCM2835-7
+   and BCM2711.
+
+Memory Management and 3D Command Submission
+===========================================
+
+This section covers the GEM implementation in the vc4 driver.
+
+GPU buffer object (BO) management
+---------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_bo.c
+   :doc: VC4 GEM BO management support
+
+V3D binner command list (BCL) validation
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_validate.c
+   :doc: Command list validator for VC4.
+
+V3D render command list (RCL) generation
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_render_cl.c
+   :doc: Render command list generation
+
+Shader validator for VC4
+---------------------------
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_validate_shaders.c
+   :doc: Shader validator for VC4.
+
+V3D Interrupts
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/vc4/vc4_irq.c
+   :doc: Interrupt management for the V3D engine
diff --git a/Documentation/gpu/vga-switcheroo.rst b/Documentation/gpu/vga-switcheroo.rst
new file mode 100644
index 0000000000..cbbdb994f1
--- /dev/null
+++ b/Documentation/gpu/vga-switcheroo.rst
@@ -0,0 +1,98 @@
+.. _vga_switcheroo:
+
+==============
+VGA Switcheroo
+==============
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :doc: Overview
+
+Modes of Use
+============
+
+Manual switching and manual power control
+-----------------------------------------
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :doc: Manual switching and manual power control
+
+Driver power control
+--------------------
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :doc: Driver power control
+
+API
+===
+
+Public functions
+----------------
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :export:
+
+Public structures
+-----------------
+
+.. kernel-doc:: include/linux/vga_switcheroo.h
+   :functions: vga_switcheroo_handler
+
+.. kernel-doc:: include/linux/vga_switcheroo.h
+   :functions: vga_switcheroo_client_ops
+
+Public constants
+----------------
+
+.. kernel-doc:: include/linux/vga_switcheroo.h
+   :functions: vga_switcheroo_handler_flags_t
+
+.. kernel-doc:: include/linux/vga_switcheroo.h
+   :functions: vga_switcheroo_client_id
+
+.. kernel-doc:: include/linux/vga_switcheroo.h
+   :functions: vga_switcheroo_state
+
+Private structures
+------------------
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :functions: vgasr_priv
+
+.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
+   :functions: vga_switcheroo_client
+
+Handlers
+========
+
+apple-gmux Handler
+------------------
+
+.. kernel-doc:: drivers/platform/x86/apple-gmux.c
+   :doc: Overview
+
+.. kernel-doc:: drivers/platform/x86/apple-gmux.c
+   :doc: Interrupt
+
+Graphics mux
+~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/platform/x86/apple-gmux.c
+   :doc: Graphics mux
+
+Power control
+~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/platform/x86/apple-gmux.c
+   :doc: Power control
+
+Backlight control
+~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/platform/x86/apple-gmux.c
+   :doc: Backlight control
+
+Public functions
+~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: include/linux/apple-gmux.h
+   :internal:
diff --git a/Documentation/gpu/vgaarbiter.rst b/Documentation/gpu/vgaarbiter.rst
new file mode 100644
index 0000000000..bde3c0afb0
--- /dev/null
+++ b/Documentation/gpu/vgaarbiter.rst
@@ -0,0 +1,191 @@
+===========
+VGA Arbiter
+===========
+
+Graphic devices are accessed through ranges in I/O or memory space. While most
+modern devices allow relocation of such ranges, some "Legacy" VGA devices
+implemented on PCI will typically have the same "hard-decoded" addresses as
+they did on ISA. For more details see "PCI Bus Binding to IEEE Std 1275-1994
+Standard for Boot (Initialization Configuration) Firmware Revision 2.1"
+Section 7, Legacy Devices.
+
+The Resource Access Control (RAC) module inside the X server [0] existed for
+the legacy VGA arbitration task (besides other bus management tasks) when more
+than one legacy device co-exists on the same machine. But the problem happens
+when these devices are trying to be accessed by different userspace clients
+(e.g. two server in parallel). Their address assignments conflict. Moreover,
+ideally, being a userspace application, it is not the role of the X server to
+control bus resources. Therefore an arbitration scheme outside of the X server
+is needed to control the sharing of these resources. This document introduces
+the operation of the VGA arbiter implemented for the Linux kernel.
+
+vgaarb kernel/userspace ABI
+---------------------------
+
+The vgaarb is a module of the Linux Kernel. When it is initially loaded, it
+scans all PCI devices and adds the VGA ones inside the arbitration. The
+arbiter then enables/disables the decoding on different devices of the VGA
+legacy instructions. Devices which do not want/need to use the arbiter may
+explicitly tell it by calling vga_set_legacy_decoding().
+
+The kernel exports a char device interface (/dev/vga_arbiter) to the clients,
+which has the following semantics:
+
+open
+        Opens a user instance of the arbiter. By default, it's attached to the
+        default VGA device of the system.
+
+close
+        Close a user instance. Release locks made by the user
+
+read
+        Return a string indicating the status of the target like:
+
+        "<card_ID>,decodes=<io_state>,owns=<io_state>,locks=<io_state> (ic,mc)"
+
+        An IO state string is of the form {io,mem,io+mem,none}, mc and
+        ic are respectively mem and io lock counts (for debugging/
+        diagnostic only). "decodes" indicate what the card currently
+        decodes, "owns" indicates what is currently enabled on it, and
+        "locks" indicates what is locked by this card. If the card is
+        unplugged, we get "invalid" then for card_ID and an -ENODEV
+        error is returned for any command until a new card is targeted.
+
+
+write
+        Write a command to the arbiter. List of commands:
+
+        target <card_ID>
+                switch target to card <card_ID> (see below)
+        lock <io_state>
+                acquires locks on target ("none" is an invalid io_state)
+        trylock <io_state>
+                non-blocking acquire locks on target (returns EBUSY if
+                unsuccessful)
+        unlock <io_state>
+                release locks on target
+        unlock all
+                release all locks on target held by this user (not implemented
+                yet)
+        decodes <io_state>
+                set the legacy decoding attributes for the card
+
+        poll
+                event if something changes on any card (not just the target)
+
+        card_ID is of the form "PCI:domain:bus:dev.fn". It can be set to "default"
+        to go back to the system default card (TODO: not implemented yet). Currently,
+        only PCI is supported as a prefix, but the userland API may support other bus
+        types in the future, even if the current kernel implementation doesn't.
+
+Note about locks:
+
+The driver keeps track of which user has which locks on which card. It
+supports stacking, like the kernel one. This complexifies the implementation
+a bit, but makes the arbiter more tolerant to user space problems and able
+to properly cleanup in all cases when a process dies.
+Currently, a max of 16 cards can have locks simultaneously issued from
+user space for a given user (file descriptor instance) of the arbiter.
+
+In the case of devices hot-{un,}plugged, there is a hook - pci_notify() - to
+notify them being added/removed in the system and automatically added/removed
+in the arbiter.
+
+There is also an in-kernel API of the arbiter in case DRM, vgacon, or other
+drivers want to use it.
+
+In-kernel interface
+-------------------
+
+.. kernel-doc:: include/linux/vgaarb.h
+   :internal:
+
+.. kernel-doc:: drivers/pci/vgaarb.c
+   :export:
+
+libpciaccess
+------------
+
+To use the vga arbiter char device it was implemented an API inside the
+libpciaccess library. One field was added to struct pci_device (each device
+on the system)::
+
+    /* the type of resource decoded by the device */
+    int vgaarb_rsrc;
+
+Besides it, in pci_system were added::
+
+    int vgaarb_fd;
+    int vga_count;
+    struct pci_device *vga_target;
+    struct pci_device *vga_default_dev;
+
+The vga_count is used to track how many cards are being arbitrated, so for
+instance, if there is only one card, then it can completely escape arbitration.
+
+These functions below acquire VGA resources for the given card and mark those
+resources as locked. If the resources requested are "normal" (and not legacy)
+resources, the arbiter will first check whether the card is doing legacy
+decoding for that type of resource. If yes, the lock is "converted" into a
+legacy resource lock. The arbiter will first look for all VGA cards that
+might conflict and disable their IOs and/or Memory access, including VGA
+forwarding on P2P bridges if necessary, so that the requested resources can
+be used. Then, the card is marked as locking these resources and the IO and/or
+Memory access is enabled on the card (including VGA forwarding on parent
+P2P bridges if any). In the case of vga_arb_lock(), the function will block
+if some conflicting card is already locking one of the required resources (or
+any resource on a different bus segment, since P2P bridges don't differentiate
+VGA memory and IO afaik). If the card already owns the resources, the function
+succeeds.  vga_arb_trylock() will return (-EBUSY) instead of blocking. Nested
+calls are supported (a per-resource counter is maintained).
+
+Set the target device of this client. ::
+
+    int  pci_device_vgaarb_set_target   (struct pci_device *dev);
+
+For instance, in x86 if two devices on the same bus want to lock different
+resources, both will succeed (lock). If devices are in different buses and
+trying to lock different resources, only the first who tried succeeds. ::
+
+    int  pci_device_vgaarb_lock         (void);
+    int  pci_device_vgaarb_trylock      (void);
+
+Unlock resources of device. ::
+
+    int  pci_device_vgaarb_unlock       (void);
+
+Indicates to the arbiter if the card decodes legacy VGA IOs, legacy VGA
+Memory, both, or none. All cards default to both, the card driver (fbdev for
+example) should tell the arbiter if it has disabled legacy decoding, so the
+card can be left out of the arbitration process (and can be safe to take
+interrupts at any time. ::
+
+    int  pci_device_vgaarb_decodes      (int new_vgaarb_rsrc);
+
+Connects to the arbiter device, allocates the struct ::
+
+    int  pci_device_vgaarb_init         (void);
+
+Close the connection ::
+
+    void pci_device_vgaarb_fini         (void);
+
+xf86VGAArbiter (X server implementation)
+----------------------------------------
+
+X server basically wraps all the functions that touch VGA registers somehow.
+
+References
+----------
+
+Benjamin Herrenschmidt (IBM?) started this work when he discussed such design
+with the Xorg community in 2005 [1, 2]. In the end of 2007, Paulo Zanoni and
+Tiago Vignatti (both of C3SL/Federal University of Paraná) proceeded his work
+enhancing the kernel code to adapt as a kernel module and also did the
+implementation of the user space side [3]. Now (2009) Tiago Vignatti and Dave
+Airlie finally put this work in shape and queued to Jesse Barnes' PCI tree.
+
+0) https://cgit.freedesktop.org/xorg/xserver/commit/?id=4b42448a2388d40f257774fbffdccaea87bd0347
+1) https://lists.freedesktop.org/archives/xorg/2005-March/006663.html
+2) https://lists.freedesktop.org/archives/xorg/2005-March/006745.html
+3) https://lists.freedesktop.org/archives/xorg/2007-October/029507.html
diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
new file mode 100644
index 0000000000..ba04ac7c21
--- /dev/null
+++ b/Documentation/gpu/vkms.rst
@@ -0,0 +1,195 @@
+.. _vkms:
+
+==========================================
+ drm/vkms Virtual Kernel Modesetting
+==========================================
+
+.. kernel-doc:: drivers/gpu/drm/vkms/vkms_drv.c
+   :doc: vkms (Virtual Kernel Modesetting)
+
+Setup
+=====
+
+The VKMS driver can be setup with the following steps:
+
+To check if VKMS is loaded, run::
+
+  lsmod | grep vkms
+
+This should list the VKMS driver. If no output is obtained, then
+you need to enable and/or load the VKMS driver.
+Ensure that the VKMS driver has been set as a loadable module in your
+kernel config file. Do::
+
+  make nconfig
+
+  Go to `Device Drivers> Graphics support`
+
+  Enable `Virtual KMS (EXPERIMENTAL)`
+
+Compile and build the kernel for the changes to get reflected.
+Now, to load the driver, use::
+
+  sudo modprobe vkms
+
+On running the lsmod command now, the VKMS driver will appear listed.
+You can also observe the driver being loaded in the dmesg logs.
+
+The VKMS driver has optional features to simulate different kinds of hardware,
+which are exposed as module options. You can use the `modinfo` command
+to see the module options for vkms::
+
+  modinfo vkms
+
+Module options are helpful when testing, and enabling modules
+can be done while loading vkms. For example, to load vkms with cursor enabled,
+use::
+
+  sudo modprobe vkms enable_cursor=1
+
+To disable the driver, use ::
+
+  sudo modprobe -r vkms
+
+Testing With IGT
+================
+
+The IGT GPU Tools is a test suite used specifically for debugging and
+development of the DRM drivers.
+The IGT Tools can be installed from
+`here <https://gitlab.freedesktop.org/drm/igt-gpu-tools>`_ .
+
+The tests need to be run without a compositor, so you need to switch to text
+only mode. You can do this by::
+
+  sudo systemctl isolate multi-user.target
+
+To return to graphical mode, do::
+
+  sudo systemctl isolate graphical.target
+
+Once you are in text only mode, you can run tests using the --device switch
+or IGT_DEVICE variable to specify the device filter for the driver we want
+to test. IGT_DEVICE can also be used with the run-test.sh script to run the
+tests for a specific driver::
+
+  sudo ./build/tests/<name of test> --device "sys:/sys/devices/platform/vkms"
+  sudo IGT_DEVICE="sys:/sys/devices/platform/vkms" ./build/tests/<name of test>
+  sudo IGT_DEVICE="sys:/sys/devices/platform/vkms" ./scripts/run-tests.sh -t <name of test>
+
+For example, to test the functionality of the writeback library,
+we can run the kms_writeback test::
+
+  sudo ./build/tests/kms_writeback --device "sys:/sys/devices/platform/vkms"
+  sudo IGT_DEVICE="sys:/sys/devices/platform/vkms" ./build/tests/kms_writeback
+  sudo IGT_DEVICE="sys:/sys/devices/platform/vkms" ./scripts/run-tests.sh -t kms_writeback
+
+You can also run subtests if you do not want to run the entire test::
+
+  sudo ./build/tests/kms_flip --run-subtest basic-plain-flip --device "sys:/sys/devices/platform/vkms"
+  sudo IGT_DEVICE="sys:/sys/devices/platform/vkms" ./build/tests/kms_flip --run-subtest basic-plain-flip
+
+TODO
+====
+
+If you want to do any of the items listed below, please share your interest
+with VKMS maintainers.
+
+IGT better support
+------------------
+
+Debugging:
+
+- kms_plane: some test cases are failing due to timeout on capturing CRC;
+
+Virtual hardware (vblank-less) mode:
+
+- VKMS already has support for vblanks simulated via hrtimers, which can be
+  tested with kms_flip test; in some way, we can say that VKMS already mimics
+  the real hardware vblank. However, we also have virtual hardware that does
+  not support vblank interrupt and completes page_flip events right away; in
+  this case, compositor developers may end up creating a busy loop on virtual
+  hardware. It would be useful to support Virtual Hardware behavior in VKMS
+  because this can help compositor developers to test their features in
+  multiple scenarios.
+
+Add Plane Features
+------------------
+
+There's lots of plane features we could add support for:
+
+- Add background color KMS property[Good to get started].
+
+- Scaling.
+
+- Additional buffer formats, especially YUV formats for video like NV12.
+  Low/high bpp RGB formats would also be interesting.
+
+- Async updates (currently only possible on cursor plane using the legacy
+  cursor api).
+
+For all of these, we also want to review the igt test coverage and make sure
+all relevant igt testcases work on vkms. They are good options for internship
+project.
+
+Runtime Configuration
+---------------------
+
+We want to be able to reconfigure vkms instance without having to reload the
+module. Use/Test-cases:
+
+- Hotplug/hotremove connectors on the fly (to be able to test DP MST handling
+  of compositors).
+
+- Configure planes/crtcs/connectors (we'd need some code to have more than 1 of
+  them first).
+
+- Change output configuration: Plug/unplug screens, change EDID, allow changing
+  the refresh rate.
+
+The currently proposed solution is to expose vkms configuration through
+configfs. All existing module options should be supported through configfs
+too.
+
+Writeback support
+-----------------
+
+- The writeback and CRC capture operations share the use of composer_enabled
+  boolean to ensure vblanks. Probably, when these operations work together,
+  composer_enabled needs to refcounting the composer state to proper work.
+  [Good to get started]
+
+- Add support for cloned writeback outputs and related test cases using a
+  cloned output in the IGT kms_writeback.
+
+- As a v4l device. This is useful for debugging compositors on special vkms
+  configurations, so that developers see what's really going on.
+
+Output Features
+---------------
+
+- Variable refresh rate/freesync support. This probably needs prime buffer
+  sharing support, so that we can use vgem fences to simulate rendering in
+  testing. Also needs support to specify the EDID.
+
+- Add support for link status, so that compositors can validate their runtime
+  fallbacks when e.g. a Display Port link goes bad.
+
+CRC API Improvements
+--------------------
+
+- Optimize CRC computation ``compute_crc()`` and plane blending ``blend()``
+
+Atomic Check using eBPF
+-----------------------
+
+Atomic drivers have lots of restrictions which are not exposed to userspace in
+any explicit form through e.g. possible property values. Userspace can only
+inquiry about these limits through the atomic IOCTL, possibly using the
+TEST_ONLY flag. Trying to add configurable code for all these limits, to allow
+compositors to be tested against them, would be rather futile exercise. Instead
+we could add support for eBPF to validate any kind of atomic state, and
+implement a library of different restrictions.
+
+This needs a bunch of features (plane compositing, multiple outputs, ...)
+enabled already to make sense.
diff --git a/Documentation/gpu/xen-front.rst b/Documentation/gpu/xen-front.rst
new file mode 100644
index 0000000000..d988da7d19
--- /dev/null
+++ b/Documentation/gpu/xen-front.rst
@@ -0,0 +1,31 @@
+====================================================
+ drm/xen-front Xen para-virtualized frontend driver
+====================================================
+
+This frontend driver implements Xen para-virtualized display
+according to the display protocol described at
+include/xen/interface/io/displif.h
+
+Driver modes of operation in terms of display buffers used
+==========================================================
+
+.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
+   :doc: Driver modes of operation in terms of display buffers used
+
+Buffers allocated by the frontend driver
+----------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
+   :doc: Buffers allocated by the frontend driver
+
+Buffers allocated by the backend
+--------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
+   :doc: Buffers allocated by the backend
+
+Driver limitations
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
+   :doc: Driver limitations
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-11 08:27:49 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-11 08:27:49 +0000
commit	ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
tree	b2d64bc10158fdd5497876388cd68142ca374ed3 /Documentation/gpu
parent	Initial commit. (diff)
download	linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip