[PATCH 5/9] drm/syncobj: use the timeline point in drm_syncobj_find_fence v3

[Chunming Zhou]

From: Christian König <ckoenig.leichtzumer...@gmail.com>

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
v4: add timeout for find fence

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/drm_syncobj.c | 50 ++++++++++++++++++++++++++++++++---
 1 file changed, 47 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 0e62a793c8dd..dd19c47d0b44 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -213,6 +213,8 @@ static void drm_syncobj_assign_null_handle(struct 
drm_syncobj *syncobj)
        dma_fence_put(fence);
 }
 
+/* 5s */
+#define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000
 /**
  * drm_syncobj_find_fence - lookup and reference the fence in a sync object
  * @file_private: drm file private pointer
@@ -233,16 +235,58 @@ 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;
+       u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
+       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 (timeout == 0) {
+                        ret = -ETIME;
+                        break;
+                }
+
+               if (signal_pending(current)) {
+                       ret = -ERESTARTSYS;
+                       break;
+               }
+
+                timeout = schedule_timeout(timeout);
+       } while (1);
+
+       __set_current_state(TASK_RUNNING);
+       *fence = wait.fence;
+
+       if (wait.node.next)
+               drm_syncobj_remove_wait(syncobj, &wait);
+
        return ret;
 }
 EXPORT_SYMBOL(drm_syncobj_find_fence);
-- 
2.17.1

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