/**
* radeon_ib_schedule - schedule an IB (Indirect Buffer) on the ring
*
* @rdev: radeon_device pointer
* @ib: IB object to schedule
* @const_ib: Const IB to schedule (SI only)
*
* Schedule an IB on the associated ring (all asics).
* Returns 0 on success, error on failure.
*
* On SI, there are two parallel engines fed from the primary ring,
* the CE (Constant Engine) and the DE (Drawing Engine). Since
* resource descriptors have moved to memory, the CE allows you to
* prime the caches while the DE is updating register state so that
* the resource descriptors will be already in cache when the draw is
* processed. To accomplish this, the userspace driver submits two
* IBs, one for the CE and one for the DE. If there is a CE IB (called
* a CONST_IB), it will be put on the ring prior to the DE IB. Prior
* to SI there was just a DE IB.
*/
int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib,
struct radeon_ib *const_ib)
{
struct radeon_ring *ring = &rdev->ring[ib->ring];
bool need_sync = false;
int i, r = 0;
if (!ib->length_dw || !ring->ready) {
/* TODO: Nothings in the ib we should report. */
dev_err(rdev->dev, "couldn't schedule ib\n");
return -EINVAL;
}
/* 64 dwords should be enough for fence too */
r = radeon_ring_lock(rdev, ring, 64 + RADEON_NUM_RINGS * 8);
if (r) {
dev_err(rdev->dev, "scheduling IB failed (%d).\n", r);
return r;
}
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
struct radeon_fence *fence = ib->sync_to[i];
if (radeon_fence_need_sync(fence, ib->ring)) {
need_sync = true;
radeon_semaphore_sync_rings(rdev, ib->semaphore,
fence->ring, ib->ring);
radeon_fence_note_sync(fence, ib->ring);
}
}
/* immediately free semaphore when we don't need to sync */
if (!need_sync) {
radeon_semaphore_free(rdev, &ib->semaphore, NULL);
}
/* if we can't remember our last VM flush then flush now! */
/* XXX figure out why we have to flush for every IB */
if (ib->vm /*&& !ib->vm->last_flush*/) {
radeon_ring_vm_flush(rdev, ib->ring, ib->vm);
}
if (const_ib) {
radeon_ring_ib_execute(rdev, const_ib->ring, const_ib);
radeon_semaphore_free(rdev, &const_ib->semaphore, NULL);
}
radeon_ring_ib_execute(rdev, ib->ring, ib);
r = radeon_fence_emit(rdev, &ib->fence, ib->ring);
if (r) {
dev_err(rdev->dev, "failed to emit fence for new IB (%d)\n", r);
radeon_ring_unlock_undo(rdev, ring);
return r;
}
if (const_ib) {
const_ib->fence = radeon_fence_ref(ib->fence);
}
/* we just flushed the VM, remember that */
if (ib->vm && !ib->vm->last_flush) {
ib->vm->last_flush = radeon_fence_ref(ib->fence);
}
radeon_ring_unlock_commit(rdev, ring);
return 0;
}
/**
* 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], false);
radeon_fence_note_sync(fence, ring);
semaphore->gpu_addr += 8;
}
return 0;
}
