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drm: GEM CMA: Split object creation into object alloc and DMA memory alloc 

This allows creating a GEM CMA object without an associated DMA memory
buffer, and will be used to implement DRM PRIME support.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Laurent Pinchart 2013-02-17 01:54:26 +01:00
parent bda3fdaa0f
commit a5ed8940d3
1 changed files with 49 additions and 36 deletions
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85
drivers/gpu/drm/drm_gem_cma_helper.c
View File

@ -32,11 +32,44 @@ static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
}
static void drm_gem_cma_buf_destroy(struct drm_device *drm,
struct drm_gem_cma_object *cma_obj)
/*
* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
* @drm: The drm device
* @size: The GEM object size
*
* This function creates and initializes a GEM CMA object of the given size, but
* doesn't allocate any memory to back the object.
*
* Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
*/
static struct drm_gem_cma_object *
__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
{
dma_free_writecombine(drm->dev, cma_obj->base.size, cma_obj->vaddr,
cma_obj->paddr);
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *gem_obj;
int ret;
cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
if (!cma_obj)
return ERR_PTR(-ENOMEM);
gem_obj = &cma_obj->base;
ret = drm_gem_object_init(drm, gem_obj, size);
if (ret)
goto error;
ret = drm_gem_create_mmap_offset(gem_obj);
if (ret) {
drm_gem_object_release(gem_obj);
goto error;
}
return cma_obj;
error:
kfree(cma_obj);
return ERR_PTR(ret);
}
/*
@ -49,45 +82,23 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
unsigned int size)
{
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *gem_obj;
int ret;
size = round_up(size, PAGE_SIZE);
cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
if (!cma_obj)
return ERR_PTR(-ENOMEM);
cma_obj = __drm_gem_cma_create(drm, size);
if (IS_ERR(cma_obj))
return cma_obj;
cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
if (!cma_obj->vaddr) {
dev_err(drm->dev, "failed to allocate buffer with size %d\n", size);
ret = -ENOMEM;
goto err_dma_alloc;
dev_err(drm->dev, "failed to allocate buffer with size %d\n",
size);
drm_gem_cma_free_object(&cma_obj->base);
return ERR_PTR(-ENOMEM);
}
gem_obj = &cma_obj->base;
ret = drm_gem_object_init(drm, gem_obj, size);
if (ret)
goto err_obj_init;
ret = drm_gem_create_mmap_offset(gem_obj);
if (ret)
goto err_create_mmap_offset;
return cma_obj;
err_create_mmap_offset:
drm_gem_object_release(gem_obj);
err_obj_init:
drm_gem_cma_buf_destroy(drm, cma_obj);
err_dma_alloc:
kfree(cma_obj);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_create);
@ -143,11 +154,13 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
if (gem_obj->map_list.map)
drm_gem_free_mmap_offset(gem_obj);
drm_gem_object_release(gem_obj);
cma_obj = to_drm_gem_cma_obj(gem_obj);
drm_gem_cma_buf_destroy(gem_obj->dev, cma_obj);
if (cma_obj->vaddr)
dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
cma_obj->vaddr, cma_obj->paddr);
drm_gem_object_release(gem_obj);
kfree(cma_obj);
}