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drm: add unpin function to prime helpers 

Prevents buffers from being pinned forever.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-04-09 09:18:44 +02:00 committed by Dave Airlie
parent 328a4719b6
commit 102d6dba30
2 changed files with 12 additions and 2 deletions
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13
drivers/gpu/drm/drm_prime.c
View File

@ -92,10 +92,13 @@ static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
static void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
{
struct drm_gem_object *obj = dma_buf->priv;
struct drm_device *dev = obj->dev;
if (obj->export_dma_buf == dma_buf) {
/* drop the reference on the export fd holds */
obj->export_dma_buf = NULL;
if (dev->driver->gem_prime_unpin)
dev->driver->gem_prime_unpin(obj);
drm_gem_object_unreference_unlocked(obj);
}
}
@ -185,13 +188,19 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
{
struct dma_buf *buf;
if (dev->driver->gem_prime_pin) {
int ret = dev->driver->gem_prime_pin(obj);
if (ret)
return ERR_PTR(ret);
}
return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size,
0600);
buf = dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size,
0600);
if (IS_ERR(buf) && dev->driver->gem_prime_unpin)
dev->driver->gem_prime_unpin(obj);
return buf;
}
EXPORT_SYMBOL(drm_gem_prime_export);

1
include/drm/drmP.h
View File

@ -930,6 +930,7 @@ struct drm_driver {
struct dma_buf *dma_buf);
/* low-level interface used by drm_gem_prime_{import,export} */
int (*gem_prime_pin)(struct drm_gem_object *obj);
void (*gem_prime_unpin)(struct drm_gem_object *obj);
struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
struct drm_gem_object *(*gem_prime_import_sg_table)(
struct drm_device *dev, size_t size,