drivers/gpu/drm/radeon/radeon_prime.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/radeon/radeon_prime.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/radeon/radeon_prime.c
Extension
.c
Size
2998 bytes
Lines
102
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

#include <linux/dma-buf.h>

#include <drm/drm_prime.h>
#include <drm/radeon_drm.h>

#include <drm/ttm/ttm_tt.h>

#include "radeon.h"
#include "radeon_prime.h"

struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct radeon_bo *bo = gem_to_radeon_bo(obj);

	return drm_prime_pages_to_sg(obj->dev, bo->tbo.ttm->pages,
				     bo->tbo.ttm->num_pages);
}

struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
							struct dma_buf_attachment *attach,
							struct sg_table *sg)
{
	struct dma_resv *resv = attach->dmabuf->resv;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_bo *bo;
	int ret;

	dma_resv_lock(resv, NULL);
	ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
			       RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
	dma_resv_unlock(resv);
	if (ret)
		return ERR_PTR(ret);

	bo->tbo.base.funcs = &radeon_gem_object_funcs;

	mutex_lock(&rdev->gem.mutex);
	list_add_tail(&bo->list, &rdev->gem.objects);
	mutex_unlock(&rdev->gem.mutex);

	bo->prime_shared_count = 1;
	return &bo->tbo.base;
}

int radeon_gem_prime_pin(struct drm_gem_object *obj)
{
	struct radeon_bo *bo = gem_to_radeon_bo(obj);
	int ret = 0;

	/* pin buffer into GTT */
	ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
	if (likely(ret == 0))
		bo->prime_shared_count++;

	return ret;
}

void radeon_gem_prime_unpin(struct drm_gem_object *obj)
{
	struct radeon_bo *bo = gem_to_radeon_bo(obj);

	radeon_bo_unpin(bo);
	if (bo->prime_shared_count)
		bo->prime_shared_count--;
}


struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
					int flags)
{
	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
	if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
		return ERR_PTR(-EPERM);
	return drm_gem_prime_export(gobj, flags);
}

Annotation

Implementation Notes