[ 073/221] drm/radeon: dont leave fence blocked process on failed GPU reset

Greg Kroah-Hartman
2013-01-15T22:29:42Z

From: Jerome Glisse <jglisse@redhat.com>

commit 76903b96adbfbb38b049765add21e02e44c387a5 upstream.

Force all fence to signal if GPU reset failed so no process get stuck
on waiting fence.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/radeon/radeon.h | 1 +
drivers/gpu/drm/radeon/radeon_device.c | 1 +
drivers/gpu/drm/radeon/radeon_fence.c | 19 +++++++++++++++++++
3 files changed, 21 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -220,6 +220,7 @@ struct radeon_fence {
int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring);
int radeon_fence_driver_init(struct radeon_device *rdev);
void radeon_fence_driver_fini(struct radeon_device *rdev);
+void radeon_fence_driver_force_completion(struct radeon_device *rdev);
int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence **fence, int ring);
void radeon_fence_process(struct radeon_device *rdev, int ring);
bool radeon_fence_signaled(struct radeon_fence *fence);
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1356,6 +1356,7 @@ retry:
}
}
} else {
+ radeon_fence_driver_force_completion(rdev);
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
kfree(ring_data[i]);
}
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -868,6 +868,25 @@ void radeon_fence_driver_fini(struct rad
mutex_unlock(&rdev->ring_lock);
}

+/**
+ * radeon_fence_driver_force_completion - force all fence waiter to complete
+ *
+ * @rdev: radeon device pointer
+ *
+ * In case of GPU reset failure make sure no process keep waiting on fence
+ * that will never complete.
+ */
+void radeon_fence_driver_force_completion(struct radeon_device *rdev)
+{
+ int ring;
+
+ for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
+ if (!rdev->fence_drv[ring].initialized)
+ continue;
+ radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);
+ }
+}
+

/*
* Fence debugfs