Quoting Chunming Zhou (2018-12-11 10:34:45)
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
>
> Implement finding the right timeline point in drm_syncobj_find_fence.
>
> v2: return -EINVAL when the point is not submitted yet.
> v3: fix reference counting bug, add flags handling as well
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/gpu/drm/drm_syncobj.c | 43 ++++++++++++++++++++++++++++++++---
> 1 file changed, 40 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
> index 76ce13dafc4d..d964b348ecba 100644
> --- a/drivers/gpu/drm/drm_syncobj.c
> +++ b/drivers/gpu/drm/drm_syncobj.c
> @@ -231,16 +231,53 @@ int drm_syncobj_find_fence(struct drm_file *file_private,
> struct dma_fence **fence)
> {
> struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
> - int ret = 0;
> + struct syncobj_wait_entry wait;
> + int ret;
>
> if (!syncobj)
> return -ENOENT;
>
> *fence = drm_syncobj_fence_get(syncobj);
> - if (!*fence) {
> + drm_syncobj_put(syncobj);
> +
> + if (*fence) {
> + ret = dma_fence_chain_find_seqno(fence, point);
> + if (!ret)
> + return 0;
> + dma_fence_put(*fence);
> + } else {
> ret = -EINVAL;
> }
> - drm_syncobj_put(syncobj);
> +
> + if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
> + return ret;
> +
> + memset(&wait, 0, sizeof(wait));
> + wait.task = current;
> + wait.point = point;
> + drm_syncobj_fence_add_wait(syncobj, &wait);
> +
> + do {
> + set_current_state(TASK_INTERRUPTIBLE);
> + if (wait.fence) {
> + ret = 0;
> + break;
> + }
> +
> + if (signal_pending(current)) {
> + ret = -ERESTARTSYS;
> + break;
> + }
> +
> + schedule();
> + } while (1);
I've previously used a dma_fence_proxy so that we could do nonblocking
waits on future submits. That would be preferrable (a requirement for
our stupid BKL-driven code).
-Chris
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