drm/amd/display: Refine globallock.

Switch to wait_for_completion_interruptible_timeout wait
since the lock is called from IOCTL context and can be
interrupted by a signal.

Global lock function might return EDEADLK or EINTR which
is not an error and just singals to user mode to restart
the call.

Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c
index 7e0e6b2..0b7786d 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c
@@ -2842,7 +2842,7 @@ static uint32_t remove_from_val_sets(
  * Grabs all modesetting locks to serialize against any blocking commits,
  * Waits for completion of all non blocking commits.
  */
-static void do_aquire_global_lock(
+static int do_aquire_global_lock(
                struct drm_device *dev,
                struct drm_atomic_state *state)
 {
@@ -2854,7 +2854,9 @@ static void do_aquire_global_lock(
         * ensure that when the framework release it the
         * extra locks we are locking here will get released to
         */
-       drm_modeset_lock_all_ctx(dev, state->acquire_ctx);
+       ret = drm_modeset_lock_all_ctx(dev, state->acquire_ctx);
+       if (ret)
+               return ret;
 
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                spin_lock(&crtc->commit_lock);
@@ -2870,15 +2872,20 @@ static void do_aquire_global_lock(
                /* Make sure all pending HW programming completed and
                 * page flips done
                 */
-               ret = wait_for_completion_timeout(&commit->hw_done,
-                                                 10*HZ);
-               ret = wait_for_completion_timeout(&commit->flip_done,
-                                                 10*HZ);
+               ret = wait_for_completion_interruptible_timeout(&commit->hw_done, 10*HZ);
+
+               if (ret > 0)
+                       ret = wait_for_completion_interruptible_timeout(
+                                       &commit->flip_done, 10*HZ);
+
                if (ret == 0)
-                       DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
-                                 crtc->base.id, crtc->name);
+                       DRM_ERROR("[CRTC:%d:%s] cleanup_done or flip_done "
+                                       "timed out\n", crtc->base.id, crtc->name);
+
                drm_crtc_commit_put(commit);
        }
+
+       return ret < 0 ? ret : 0;
 }
 
 int amdgpu_dm_atomic_check(struct drm_device *dev,
@@ -3145,7 +3152,7 @@ int amdgpu_dm_atomic_check(struct drm_device *dev,
                 * synchronization events.
                 */
                if (aquire_global_lock)
-                       do_aquire_global_lock(dev, state);
+                       ret = do_aquire_global_lock(dev, state);
 
        }
 
@@ -3161,8 +3168,14 @@ int amdgpu_dm_atomic_check(struct drm_device *dev,
        for (i = 0; i < new_stream_count; i++)
                dc_stream_release(new_streams[i]);
 
-       if (ret != 0)
-               DRM_ERROR("Atomic check failed.\n");
+       if (ret != 0) {
+               if (ret == -EDEADLK)
+                       DRM_DEBUG_KMS("Atomic check stopped due to to deadlock, retrying.\n");
+               else if (ret == -EINTR || ret == -EAGAIN || ret == -ERESTARTSYS)
+                       DRM_DEBUG_KMS("Atomic check stopped due to to signal, retrying.\n");
+               else
+                       DRM_ERROR("Atomic check failed.\n");
+       }
 
        return ret;
 }