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Subject[PATCH 06/12] drm: remove prime sg_table caching
Date
That is now done by the DMA-buf helpers instead.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/drm_prime.c | 76 ++++++++-----------------------------
1 file changed, 16 insertions(+), 60 deletions(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 1fadf5d5ed33..7e439ea3546a 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -86,11 +86,6 @@ struct drm_prime_member {
struct rb_node handle_rb;
};

-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)
{
@@ -188,25 +183,16 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
* @dma_buf: buffer to attach device to
* @attach: buffer attachment data
*
- * Allocates &drm_prime_attachment and calls &drm_driver.gem_prime_pin for
- * device specific attachment. This can be used as the &dma_buf_ops.attach
- * callback.
+ * Calls &drm_driver.gem_prime_pin for device specific handling. This can be
+ * used as the &dma_buf_ops.attach callback.
*
* Returns 0 on success, negative error code on failure.
*/
int drm_gem_map_attach(struct dma_buf *dma_buf,
struct dma_buf_attachment *attach)
{
- struct drm_prime_attachment *prime_attach;
struct drm_gem_object *obj = dma_buf->priv;

- prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL);
- if (!prime_attach)
- return -ENOMEM;
-
- prime_attach->dir = DMA_NONE;
- attach->priv = prime_attach;
-
return drm_gem_pin(obj);
}
EXPORT_SYMBOL(drm_gem_map_attach);
@@ -222,26 +208,8 @@ EXPORT_SYMBOL(drm_gem_map_attach);
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;

- if (prime_attach) {
- struct sg_table *sgt = prime_attach->sgt;
-
- if (sgt) {
- if (prime_attach->dir != DMA_NONE)
- dma_unmap_sg_attrs(attach->dev, sgt->sgl,
- sgt->nents,
- prime_attach->dir,
- DMA_ATTR_SKIP_CPU_SYNC);
- sg_free_table(sgt);
- }
-
- kfree(sgt);
- kfree(prime_attach);
- attach->priv = NULL;
- }
-
drm_gem_unpin(obj);
}
EXPORT_SYMBOL(drm_gem_map_detach);
@@ -286,39 +254,22 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
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))
+ if (WARN_ON(dir == DMA_NONE))
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);
-
if (obj->funcs)
sgt = obj->funcs->get_sg_table(obj);
else
sgt = obj->dev->driver->gem_prime_get_sg_table(obj);

- if (!IS_ERR(sgt)) {
- if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
- DMA_ATTR_SKIP_CPU_SYNC)) {
- sg_free_table(sgt);
- kfree(sgt);
- sgt = ERR_PTR(-ENOMEM);
- } else {
- prime_attach->sgt = sgt;
- prime_attach->dir = dir;
- }
+ if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ sgt = ERR_PTR(-ENOMEM);
}

return sgt;
@@ -331,14 +282,19 @@ EXPORT_SYMBOL(drm_gem_map_dma_buf);
* @sgt: scatterlist info of the buffer to unmap
* @dir: direction of DMA transfer
*
- * Not implemented. The unmap is done at drm_gem_map_detach(). This can be
- * used as the &dma_buf_ops.unmap_dma_buf callback.
+ * This can be used as the &dma_buf_ops.unmap_dma_buf callback.
*/
void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
- /* nothing to be done here */
+ if (!sgt)
+ return;
+
+ dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ sg_free_table(sgt);
+ kfree(sgt);
}
EXPORT_SYMBOL(drm_gem_unmap_dma_buf);

--
2.17.1
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