/**
* radeon_semaphore_sync_rings - sync ring to all registered fences
*
* @rdev: radeon_device pointer
* @semaphore: semaphore object to use for sync
* @ring: ring that needs sync
*
* Ensure that all registered fences are signaled before letting
* the ring continue. The caller must hold the ring lock.
*/
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
struct radeon_semaphore *semaphore,
int ring)
{
unsigned count = 0;
int i, r;
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
struct radeon_fence *fence = semaphore->sync_to[i];
/* check if we really need to sync */
if (!radeon_fence_need_sync(fence, ring))
continue;
/* prevent GPU deadlocks */
if (!rdev->ring[i].ready) {
dev_err(rdev->dev, "Syncing to a disabled ring!");
return -EINVAL;
}
if (++count > RADEON_NUM_SYNCS) {
/* not enough room, wait manually */
r = radeon_fence_wait(fence, false);
if (r)
return r;
continue;
}
/* allocate enough space for sync command */
r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
if (r) {
return r;
}
/* emit the signal semaphore */
if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
/* signaling wasn't successful wait manually */
radeon_ring_undo(&rdev->ring[i]);
r = radeon_fence_wait(fence, false);
if (r)
return r;
continue;
}
/* we assume caller has already allocated space on waiters ring */
if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
/* waiting wasn't successful wait manually */
radeon_ring_undo(&rdev->ring[i]);
r = radeon_fence_wait(fence, false);
if (r)
return r;
continue;
}
radeon_ring_commit(rdev, &rdev->ring[i]);
radeon_fence_note_sync(fence, ring);
semaphore->gpu_addr += 8;
}
return 0;
}
void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *ring)
{
radeon_ring_undo(ring);
mutex_unlock(&rdev->ring_lock);
}
