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drm/ttm: use ttm_bo_reserve_slowpath_nolru in ttm_eu_reserve_buffers, v2

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This requires re-use of the seqno, which increases fairness slightly.
Instead of spinning with a new seqno every time we keep the current one,
but still drop all other reservations we hold. Only when we succeed,
we try to get back our other reservations again.

This should increase fairness slightly as well.

Changes since v1:
 - Increase val_seq before calling ttm_bo_reserve_slowpath_nolru and
   retrying to take all entries to prevent a race.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-01-15 14:57:10 +01:00
parent 5e45d7dfd7
commit f2d476a110
1 changed files with 21 additions and 2 deletions
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23
drivers/gpu/drm/ttm/ttm_execbuf_util.c
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@ -129,13 +129,17 @@ int ttm_eu_reserve_buffers(struct list_head *list)
entry = list_first_entry(list, struct ttm_validate_buffer, head);
glob = entry->bo->glob;
retry:
spin_lock(&glob->lru_lock);
val_seq = entry->bo->bdev->val_seq++;
retry:
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
/* already slowpath reserved? */
if (entry->reserved)
continue;
ret = ttm_bo_reserve_nolru(bo, true, true, true, val_seq);
switch (ret) {
case 0:
@ -155,11 +159,26 @@ retry:
/* fallthrough */
case -EAGAIN:
ttm_eu_backoff_reservation_locked(list);
/*
* temporarily increase sequence number every retry,
* to prevent us from seeing our old reservation
* sequence when someone else reserved the buffer,
* but hasn't updated the seq_valid/seqno members yet.
*/
val_seq = entry->bo->bdev->val_seq++;
spin_unlock(&glob->lru_lock);
ttm_eu_list_ref_sub(list);
ret = ttm_bo_wait_unreserved(bo, true);
ret = ttm_bo_reserve_slowpath_nolru(bo, true, val_seq);
if (unlikely(ret != 0))
return ret;
spin_lock(&glob->lru_lock);
entry->reserved = true;
if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
ret = -EBUSY;
goto err;
}
goto retry;
default:
goto err;