Change drm_gem_prime_handle_to_fd to drm_gem_prime_handle_to_dmabuf to
export a dmabuf without creating an FD as a user mode handle. This is
more useful for users in kernel mode.
Suggested-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
drivers/gpu/drm/drm_prime.c | 63 ++++++++++++++++++-------------------
include/drm/drm_prime.h | 6 ++--
2 files changed, 33 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 834a5e28abbe..d491b5f73eea 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -410,26 +410,25 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
}
/**
- * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
+ * drm_gem_prime_handle_to_dmabuf - PRIME export function for GEM drivers
* @dev: dev to export the buffer from
* @file_priv: drm file-private structure
* @handle: buffer handle to export
* @flags: flags like DRM_CLOEXEC
- * @prime_fd: pointer to storage for the fd id of the create dma-buf
+ * @dma_buf: pointer to storage for the dma-buf reference
*
* This is the PRIME export function which must be used mandatorily by GEM
* drivers to ensure correct lifetime management of the underlying GEM object.
* The actual exporting from GEM object to a dma-buf is done through the
* &drm_gem_object_funcs.export callback.
*/
-int drm_gem_prime_handle_to_fd(struct drm_device *dev,
- struct drm_file *file_priv, uint32_t handle,
- uint32_t flags,
- int *prime_fd)
+struct dma_buf *drm_gem_prime_handle_to_dmabuf(struct drm_device *dev,
+ struct drm_file *file_priv,
+ uint32_t handle, uint32_t flags)
{
struct drm_gem_object *obj;
int ret = 0;
- struct dma_buf *dmabuf;
+ struct dma_buf *dmabuf = NULL;
mutex_lock(&file_priv->prime.lock);
obj = drm_gem_object_lookup(file_priv, handle);
@@ -441,7 +440,7 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle);
if (dmabuf) {
get_dma_buf(dmabuf);
- goto out_have_handle;
+ goto out;
}
mutex_lock(&dev->object_name_lock);
@@ -479,40 +478,22 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
dmabuf, handle);
mutex_unlock(&dev->object_name_lock);
if (ret)
- goto fail_put_dmabuf;
-
-out_have_handle:
- ret = dma_buf_fd(dmabuf, flags);
- /*
- * We must _not_ remove the buffer from the handle cache since the newly
- * created dma buf is already linked in the global obj->dma_buf pointer,
- * and that is invariant as long as a userspace gem handle exists.
- * Closing the handle will clean out the cache anyway, so we don't leak.
- */
- if (ret < 0) {
- goto fail_put_dmabuf;
- } else {
- *prime_fd = ret;
- ret = 0;
- }
-
- goto out;
-
-fail_put_dmabuf:
- dma_buf_put(dmabuf);
+ dma_buf_put(dmabuf);
out:
drm_gem_object_put(obj);
out_unlock:
mutex_unlock(&file_priv->prime.lock);
- return ret;
+ return ret ? ERR_PTR(ret) : dmabuf;
}
-EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
+EXPORT_SYMBOL(drm_gem_prime_handle_to_dmabuf);
int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_prime_handle *args = data;
+ struct dma_buf *dmabuf;
+ int ret;
/* check flags are valid */
if (args->flags & ~(DRM_CLOEXEC | DRM_RDWR))
@@ -523,8 +504,24 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
args->handle, args->flags,
&args->fd);
}
- return drm_gem_prime_handle_to_fd(dev, file_priv, args->handle,
- args->flags, &args->fd);
+ dmabuf = drm_gem_prime_handle_to_dmabuf(dev, file_priv, args->handle,
+ args->flags);
+ if (IS_ERR(dmabuf))
+ return PTR_ERR(dmabuf);
+ ret = dma_buf_fd(dmabuf, args->flags);
+ /*
+ * We must _not_ remove the buffer from the handle cache since the newly
+ * created dma buf is already linked in the global obj->dma_buf pointer,
+ * and that is invariant as long as a userspace gem handle exists.
+ * Closing the handle will clean out the cache anyway, so we don't leak.
+ */
+ if (ret < 0) {
+ dma_buf_put(dmabuf);
+ } else {
+ args->fd = ret;
+ ret = 0;
+ }
+ return ret;
}
/**
diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
index 2a1d01e5b56b..89e839293d14 100644
--- a/include/drm/drm_prime.h
+++ b/include/drm/drm_prime.h
@@ -69,9 +69,9 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
struct drm_file *file_priv, int prime_fd, uint32_t *handle);
-int drm_gem_prime_handle_to_fd(struct drm_device *dev,
- struct drm_file *file_priv, uint32_t handle, uint32_t flags,
- int *prime_fd);
+struct dma_buf *drm_gem_prime_handle_to_dmabuf(struct drm_device *dev,
+ struct drm_file *file_priv,
+ uint32_t handle, uint32_t flags);
/* helper functions for exporting */
int drm_gem_map_attach(struct dma_buf *dma_buf,
--
2.34.1
