Am 26.03.25 um 15:39 schrieb Rob Clark:
> From: Rob Clark <robdcl...@chromium.org>
>
> Add support for exporting a dma_fence fd for a specific point on a
> timeline.
Looks good on first glance. What's the userspace use case?
Regards,
Christian.
>
> Signed-off-by: Rob Clark <robdcl...@chromium.org>
> ---
> drivers/gpu/drm/drm_syncobj.c | 8 ++++++--
> include/uapi/drm/drm.h | 2 ++
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
> index 4f2ab8a7b50f..eb7a2dd2e261 100644
> --- a/drivers/gpu/drm/drm_syncobj.c
> +++ b/drivers/gpu/drm/drm_syncobj.c
> @@ -762,7 +762,7 @@ static int drm_syncobj_import_sync_file_fence(struct
> drm_file *file_private,
> }
>
> static int drm_syncobj_export_sync_file(struct drm_file *file_private,
> - int handle, int *p_fd)
> + int handle, u64 point, int *p_fd)
> {
> int ret;
> struct dma_fence *fence;
> @@ -772,7 +772,7 @@ static int drm_syncobj_export_sync_file(struct drm_file
> *file_private,
> if (fd < 0)
> return fd;
>
> - ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
> + ret = drm_syncobj_find_fence(file_private, handle, point, 0, &fence);
> if (ret)
> goto err_put_fd;
>
> @@ -882,8 +882,12 @@ drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev,
> void *data,
>
> if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
> return drm_syncobj_export_sync_file(file_private, args->handle,
> + args->point,
> &args->fd);
>
> + if (args->point)
> + return -EINVAL;
> +
> return drm_syncobj_handle_to_fd(file_private, args->handle,
> &args->fd);
> }
> diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
> index 7fba37b94401..c71a8f4439f2 100644
> --- a/include/uapi/drm/drm.h
> +++ b/include/uapi/drm/drm.h
> @@ -912,6 +912,8 @@ struct drm_syncobj_handle {
>
> __s32 fd;
> __u32 pad;
> +
> + __u64 point;
> };
>
> struct drm_syncobj_transfer {
