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drm/cma: add low-level hook functions to use prime helpers 

Instead of using the dma_buf functionality for GEM CMA, we can use prime
helpers if we can provide low-level hook functions for GEM CMA.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Joonyoung Shim 2013-06-28 14:24:54 +09:00 committed by Dave Airlie
parent 7c397cd97b
commit 78467dc5f7
2 changed files with 88 additions and 0 deletions
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79
drivers/gpu/drm/drm_gem_cma_helper.c
View File

@ -602,3 +602,82 @@ struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm,
return ERR_PTR(ret); return ERR_PTR(ret);
} }
EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import); EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import);
/* low-level interface prime helpers */
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
struct sg_table *sgt;
int ret;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return NULL;
ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
cma_obj->paddr, obj->size);
if (ret < 0)
goto out;
return sgt;
out:
kfree(sgt);
return NULL;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
struct drm_gem_object *
drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
struct sg_table *sgt)
{
struct drm_gem_cma_object *cma_obj;
if (sgt->nents != 1)
return ERR_PTR(-EINVAL);
/* Create a CMA GEM buffer. */
cma_obj = __drm_gem_cma_create(dev, size);
if (IS_ERR(cma_obj))
return ERR_PTR(PTR_ERR(cma_obj));
cma_obj->paddr = sg_dma_address(sgt->sgl);
cma_obj->sgt = sgt;
DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size);
return &cma_obj->base;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct drm_gem_cma_object *cma_obj;
struct drm_device *dev = obj->dev;
int ret;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(obj, obj->size, vma);
mutex_unlock(&dev->struct_mutex);
if (ret < 0)
return ret;
cma_obj = to_drm_gem_cma_obj(obj);
return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
return cma_obj->vaddr;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
/* Nothing to do */
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);

9
include/drm/drm_gem_cma_helper.h
View File

@ -54,4 +54,13 @@ struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm_dev,
struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm_dev, struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm_dev,
struct dma_buf *dma_buf); struct dma_buf *dma_buf);
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *
drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
struct sg_table *sgt);
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma);
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
#endif /* __DRM_GEM_CMA_HELPER_H__ */ #endif /* __DRM_GEM_CMA_HELPER_H__ */