Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 266 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
new file mode 100644
index 0000000000..bf6097e743
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_region_ttm.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+#include <drm/ttm/ttm_device.h>
+#include <drm/ttm/ttm_range_manager.h>
+
+#include "i915_drv.h"
+#include "i915_scatterlist.h"
+#include "i915_ttm_buddy_manager.h"
+
+#include "intel_region_ttm.h"
+
+#include "gem/i915_gem_region.h"
+#include "gem/i915_gem_ttm.h" /* For the funcs/ops export only */
+/**
+ * DOC: TTM support structure
+ *
+ * The code in this file deals with setting up memory managers for TTM
+ * LMEM and MOCK regions and converting the output from
+ * the managers to struct sg_table, Basically providing the mapping from
+ * i915 GEM regions to TTM memory types and resource managers.
+ */
+
+/**
+ * intel_region_ttm_device_init - Initialize a TTM device
+ * @dev_priv: Pointer to an i915 device private structure.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int intel_region_ttm_device_init(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *drm = &dev_priv->drm;
+
+	return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(),
+			       drm->dev, drm->anon_inode->i_mapping,
+			       drm->vma_offset_manager, false, false);
+}
+
+/**
+ * intel_region_ttm_device_fini - Finalize a TTM device
+ * @dev_priv: Pointer to an i915 device private structure.
+ */
+void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv)
+{
+	ttm_device_fini(&dev_priv->bdev);
+}
+
+/*
+ * Map the i915 memory regions to TTM memory types. We use the
+ * driver-private types for now, reserving TTM_PL_VRAM for stolen
+ * memory and TTM_PL_TT for GGTT use if decided to implement this.
+ */
+int intel_region_to_ttm_type(const struct intel_memory_region *mem)
+{
+	int type;
+
+	GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
+		   mem->type != INTEL_MEMORY_MOCK &&
+		   mem->type != INTEL_MEMORY_SYSTEM);
+
+	if (mem->type == INTEL_MEMORY_SYSTEM)
+		return TTM_PL_SYSTEM;
+
+	type = mem->instance + TTM_PL_PRIV;
+	GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);
+
+	return type;
+}
+
+/**
+ * intel_region_ttm_init - Initialize a memory region for TTM.
+ * @mem: The region to initialize.
+ *
+ * This function initializes a suitable TTM resource manager for the
+ * region, and if it's a LMEM region type, attaches it to the TTM
+ * device. MOCK regions are NOT attached to the TTM device, since we don't
+ * have one for the mock selftests.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int intel_region_ttm_init(struct intel_memory_region *mem)
+{
+	struct ttm_device *bdev = &mem->i915->bdev;
+	int mem_type = intel_region_to_ttm_type(mem);
+	int ret;
+
+	ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
+				      resource_size(&mem->region),
+				      mem->io_size,
+				      mem->min_page_size, PAGE_SIZE);
+	if (ret)
+		return ret;
+
+	mem->region_private = ttm_manager_type(bdev, mem_type);
+
+	return 0;
+}
+
+/**
+ * intel_region_ttm_fini - Finalize a TTM region.
+ * @mem: The memory region
+ *
+ * This functions takes down the TTM resource manager associated with the
+ * memory region, and if it was registered with the TTM device,
+ * removes that registration.
+ */
+int intel_region_ttm_fini(struct intel_memory_region *mem)
+{
+	struct ttm_resource_manager *man = mem->region_private;
+	int ret = -EBUSY;
+	int count;
+
+	/*
+	 * Put the region's move fences. This releases requests that
+	 * may hold on to contexts and vms that may hold on to buffer
+	 * objects placed in this region.
+	 */
+	if (man)
+		ttm_resource_manager_cleanup(man);
+
+	/* Flush objects from region. */
+	for (count = 0; count < 10; ++count) {
+		i915_gem_flush_free_objects(mem->i915);
+
+		mutex_lock(&mem->objects.lock);
+		if (list_empty(&mem->objects.list))
+			ret = 0;
+		mutex_unlock(&mem->objects.lock);
+		if (!ret)
+			break;
+
+		msleep(20);
+		drain_workqueue(mem->i915->bdev.wq);
+	}
+
+	/* If we leaked objects, Don't free the region causing use after free */
+	if (ret || !man)
+		return ret;
+
+	ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
+				      intel_region_to_ttm_type(mem));
+	GEM_WARN_ON(ret);
+	mem->region_private = NULL;
+
+	return ret;
+}
+
+/**
+ * intel_region_ttm_resource_to_rsgt -
+ * Convert an opaque TTM resource manager resource to a refcounted sg_table.
+ * @mem: The memory region.
+ * @res: The resource manager resource obtained from the TTM resource manager.
+ * @page_alignment: Required page alignment for each sg entry. Power of two.
+ *
+ * The gem backends typically use sg-tables for operations on the underlying
+ * io_memory. So provide a way for the backends to translate the
+ * nodes they are handed from TTM to sg-tables.
+ *
+ * Return: A malloced sg_table on success, an error pointer on failure.
+ */
+struct i915_refct_sgt *
+intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
+				  struct ttm_resource *res,
+				  u32 page_alignment)
+{
+	if (mem->is_range_manager) {
+		struct ttm_range_mgr_node *range_node =
+			to_ttm_range_mgr_node(res);
+
+		return i915_rsgt_from_mm_node(&range_node->mm_nodes[0],
+					      mem->region.start,
+					      page_alignment);
+	} else {
+		return i915_rsgt_from_buddy_resource(res, mem->region.start,
+						     page_alignment);
+	}
+}
+
+#ifdef CONFIG_DRM_I915_SELFTEST
+/**
+ * intel_region_ttm_resource_alloc - Allocate memory resources from a region
+ * @mem: The memory region,
+ * @offset: BO offset
+ * @size: The requested size in bytes
+ * @flags: Allocation flags
+ *
+ * This functionality is provided only for callers that need to allocate
+ * memory from standalone TTM range managers, without the TTM eviction
+ * functionality. Don't use if you are not completely sure that's the
+ * case. The returned opaque node can be converted to an sg_table using
+ * intel_region_ttm_resource_to_st(), and can be freed using
+ * intel_region_ttm_resource_free().
+ *
+ * Return: A valid pointer on success, an error pointer on failure.
+ */
+struct ttm_resource *
+intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
+				resource_size_t offset,
+				resource_size_t size,
+				unsigned int flags)
+{
+	struct ttm_resource_manager *man = mem->region_private;
+	struct ttm_place place = {};
+	struct ttm_buffer_object mock_bo = {};
+	struct ttm_resource *res;
+	int ret;
+
+	if (flags & I915_BO_ALLOC_CONTIGUOUS)
+		place.flags |= TTM_PL_FLAG_CONTIGUOUS;
+	if (offset != I915_BO_INVALID_OFFSET) {
+		if (WARN_ON(overflows_type(offset >> PAGE_SHIFT, place.fpfn))) {
+			ret = -E2BIG;
+			goto out;
+		}
+		place.fpfn = offset >> PAGE_SHIFT;
+		if (WARN_ON(overflows_type(place.fpfn + (size >> PAGE_SHIFT), place.lpfn))) {
+			ret = -E2BIG;
+			goto out;
+		}
+		place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
+	} else if (mem->io_size && mem->io_size < mem->total) {
+		if (flags & I915_BO_ALLOC_GPU_ONLY) {
+			place.flags |= TTM_PL_FLAG_TOPDOWN;
+		} else {
+			place.fpfn = 0;
+			if (WARN_ON(overflows_type(mem->io_size >> PAGE_SHIFT, place.lpfn))) {
+				ret = -E2BIG;
+				goto out;
+			}
+			place.lpfn = mem->io_size >> PAGE_SHIFT;
+		}
+	}
+
+	mock_bo.base.size = size;
+	mock_bo.bdev = &mem->i915->bdev;
+
+	ret = man->func->alloc(man, &mock_bo, &place, &res);
+
+out:
+	if (ret == -ENOSPC)
+		ret = -ENXIO;
+	if (!ret)
+		res->bo = NULL; /* Rather blow up, then some uaf */
+	return ret ? ERR_PTR(ret) : res;
+}
+
+#endif
+
+/**
+ * intel_region_ttm_resource_free - Free a resource allocated from a resource manager
+ * @mem: The region the resource was allocated from.
+ * @res: The opaque resource representing an allocation.
+ */
+void intel_region_ttm_resource_free(struct intel_memory_region *mem,
+				    struct ttm_resource *res)
+{
+	struct ttm_resource_manager *man = mem->region_private;
+	struct ttm_buffer_object mock_bo = {};
+
+	mock_bo.base.size = res->size;
+	mock_bo.bdev = &mem->i915->bdev;
+	res->bo = &mock_bo;
+
+	man->func->free(man, res);
+}