Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 1218 insertions, 0 deletions

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.