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Commit 538d6661 authored by Joonyoung Shim's avatar Joonyoung Shim Committed by Dave Airlie
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drm/prime: support to cache mapping 



The drm prime also can support it like GEM CMA supports to cache
mapping. It doesn't allow multiple mappings for one attachment.

[airlied: rebased on top of other prime changes]
Signed-off-by: default avatarJoonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 7e3d88f9

drivers/gpu/drm/drm_prime.c

+49 −3
Original line number Diff line number Diff line
@@ -62,15 +62,29 @@ struct drm_prime_member { 
	struct dma_buf *dma_buf;

	uint32_t handle;

};



struct drm_prime_attachment {

	struct sg_table *sgt;

	enum dma_data_direction dir;

};



static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle);



static int drm_gem_map_attach(struct dma_buf *dma_buf,

			      struct device *target_dev,

			      struct dma_buf_attachment *attach)

{

	struct drm_prime_attachment *prime_attach;

	struct drm_gem_object *obj = dma_buf->priv;

	struct drm_device *dev = obj->dev;



	prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL);

	if (!prime_attach)

		return -ENOMEM;



	prime_attach->dir = DMA_NONE;

	attach->priv = prime_attach;



	if (!dev->driver->gem_prime_pin)

		return 0;
@@ -80,19 +94,50 @@ static int drm_gem_map_attach(struct dma_buf *dma_buf, 
static void drm_gem_map_detach(struct dma_buf *dma_buf,

			       struct dma_buf_attachment *attach)

{

	struct drm_prime_attachment *prime_attach = attach->priv;

	struct drm_gem_object *obj = dma_buf->priv;

	struct drm_device *dev = obj->dev;

	struct sg_table *sgt;



	if (dev->driver->gem_prime_unpin)

		dev->driver->gem_prime_unpin(obj);



	if (!prime_attach)

		return;



	sgt = prime_attach->sgt;



	if (prime_attach->dir != DMA_NONE)

		dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,

				prime_attach->dir);



	sg_free_table(sgt);

	kfree(sgt);

	kfree(prime_attach);

	attach->priv = NULL;

}



static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,

		enum dma_data_direction dir)

{

	struct drm_prime_attachment *prime_attach = attach->priv;

	struct drm_gem_object *obj = attach->dmabuf->priv;

	struct sg_table *sgt;



	if (WARN_ON(dir == DMA_NONE || !prime_attach))

		return ERR_PTR(-EINVAL);



	/* return the cached mapping when possible */

	if (prime_attach->dir == dir)

		return prime_attach->sgt;



	/*

	 * two mappings with different directions for the same attachment are

	 * not allowed

	 */

	if (WARN_ON(prime_attach->dir != DMA_NONE))

		return ERR_PTR(-EBUSY);



	mutex_lock(&obj->dev->struct_mutex);



	sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
@@ -102,6 +147,9 @@ static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, 
			sg_free_table(sgt);

			kfree(sgt);

			sgt = ERR_PTR(-ENOMEM);

		} else {

			prime_attach->sgt = sgt;

			prime_attach->dir = dir;

		}

	}
@@ -112,9 +160,7 @@ static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, 
static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,

		struct sg_table *sgt, enum dma_data_direction dir)

{

	dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);

	sg_free_table(sgt);

	kfree(sgt);

	/* nothing to be done here */

}



static void drm_gem_dmabuf_release(struct dma_buf *dma_buf)