drm/vmwgfx: Add support for imported Fence File Descriptor
This allows vmwgfx to wait on a fence created by another
device.
v2:
* Remove special handling for vmwgfx fence and just use dma_fence_wait()
* Use interruptible waits
* Added function documentation
Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Deepak Singh Rawat <drawat@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 178dabc..f94f43c 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -24,6 +24,7 @@
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
+#include <linux/sync_file.h>
#include "vmwgfx_drv.h"
#include "vmwgfx_reg.h"
@@ -4414,6 +4415,7 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned long data,
static const size_t copy_offset[] = {
offsetof(struct drm_vmw_execbuf_arg, context_handle),
sizeof(struct drm_vmw_execbuf_arg)};
+ struct dma_fence *in_fence = NULL;
if (unlikely(size < copy_offset[0])) {
DRM_ERROR("Invalid command size, ioctl %d\n",
@@ -4453,6 +4455,21 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned long data,
break;
}
+
+ /* If imported a fence FD from elsewhere, then wait on it */
+ if (arg.flags & DRM_VMW_EXECBUF_FLAG_IMPORT_FENCE_FD) {
+ in_fence = sync_file_get_fence(arg.imported_fence_fd);
+
+ if (!in_fence) {
+ DRM_ERROR("Cannot get imported fence\n");
+ return -EINVAL;
+ }
+
+ ret = vmw_wait_dma_fence(dev_priv->fman, in_fence);
+ if (ret)
+ goto out;
+ }
+
ret = ttm_read_lock(&dev_priv->reservation_sem, true);
if (unlikely(ret != 0))
return ret;
@@ -4465,9 +4482,12 @@ int vmw_execbuf_ioctl(struct drm_device *dev, unsigned long data,
NULL);
ttm_read_unlock(&dev_priv->reservation_sem);
if (unlikely(ret != 0))
- return ret;
+ goto out;
vmw_kms_cursor_post_execbuf(dev_priv);
- return 0;
+out:
+ if (in_fence)
+ dma_fence_put(in_fence);
+ return ret;
}