drivers/gpu/drm/i915/selftests/mock_region.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/selftests/mock_region.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/selftests/mock_region.c
Extension
.c
Size
3141 bytes
Lines
125
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2019-2021 Intel Corporation
 */

#include <drm/ttm/ttm_placement.h>
#include <linux/scatterlist.h>

#include "gem/i915_gem_region.h"
#include "intel_memory_region.h"
#include "intel_region_ttm.h"

#include "mock_region.h"

static void mock_region_put_pages(struct drm_i915_gem_object *obj,
				  struct sg_table *pages)
{
	i915_refct_sgt_put(obj->mm.rsgt);
	obj->mm.rsgt = NULL;
	intel_region_ttm_resource_free(obj->mm.region, obj->mm.res);
}

static int mock_region_get_pages(struct drm_i915_gem_object *obj)
{
	struct sg_table *pages;
	int err;

	obj->mm.res = intel_region_ttm_resource_alloc(obj->mm.region,
						      obj->bo_offset,
						      obj->base.size,
						      obj->flags);
	if (IS_ERR(obj->mm.res))
		return PTR_ERR(obj->mm.res);

	obj->mm.rsgt = intel_region_ttm_resource_to_rsgt(obj->mm.region,
							 obj->mm.res,
							 obj->mm.region->min_page_size);
	if (IS_ERR(obj->mm.rsgt)) {
		err = PTR_ERR(obj->mm.rsgt);
		goto err_free_resource;
	}

	pages = &obj->mm.rsgt->table;
	__i915_gem_object_set_pages(obj, pages);

	return 0;

err_free_resource:
	intel_region_ttm_resource_free(obj->mm.region, obj->mm.res);
	return err;
}

static const struct drm_i915_gem_object_ops mock_region_obj_ops = {
	.name = "mock-region",
	.get_pages = mock_region_get_pages,
	.put_pages = mock_region_put_pages,
	.release = i915_gem_object_release_memory_region,
};

static int mock_object_init(struct intel_memory_region *mem,
			    struct drm_i915_gem_object *obj,
			    resource_size_t offset,
			    resource_size_t size,
			    resource_size_t page_size,
			    unsigned int flags)
{
	static struct lock_class_key lock_class;
	struct drm_i915_private *i915 = mem->i915;

	if (size > resource_size(&mem->region))
		return -E2BIG;

	drm_gem_private_object_init(&i915->drm, &obj->base, size);
	i915_gem_object_init(obj, &mock_region_obj_ops, &lock_class, flags);

	obj->bo_offset = offset;

	obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;

	i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);

	i915_gem_object_init_memory_region(obj, mem);

	return 0;
}

static int mock_region_fini(struct intel_memory_region *mem)
{
	struct drm_i915_private *i915 = mem->i915;
	int instance = mem->instance;

Annotation

Implementation Notes