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Commit 78467dc5 authored by Joonyoung Shim's avatar Joonyoung Shim Committed by Dave Airlie
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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: default avatarJoonyoung Shim <jy0922.shim@samsung.com>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 7c397cd9

drivers/gpu/drm/drm_gem_cma_helper.c

+79 −0
Original line number Diff line number Diff line
@@ -602,3 +602,82 @@ error_gem_free: 
	return ERR_PTR(ret);

}

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);

include/drm/drm_gem_cma_helper.h

+9 −0
Original line number Diff line number Diff line
@@ -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 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__ */