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authorMaarten Lankhorst <maarten.lankhorst@canonical.com>2013-01-15 14:56:48 +0100
committerMaarten Lankhorst <maarten.lankhorst@canonical.com>2013-01-15 14:56:48 +0100
commit7a1863084c9d90ce4b67d645bf9b0f1612e68f62 (patch)
treef888cffea1079ef31e4e27bf5d7215c92b325756
parentdrm/ttm: remove lru_lock around ttm_bo_reserve (diff)
downloadlinux-7a1863084c9d90ce4b67d645bf9b0f1612e68f62.tar.xz
linux-7a1863084c9d90ce4b67d645bf9b0f1612e68f62.zip
drm/ttm: cleanup ttm_eu_reserve_buffers handling
With the lru lock no longer required for protecting reservations we can just do a ttm_bo_reserve_nolru on -EBUSY, and handle all errors in a single path. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Reviewed-by: Jerome Glisse <jglisse@redhat.com>
-rw-r--r--drivers/gpu/drm/ttm/ttm_execbuf_util.c53
1 files changed, 21 insertions, 32 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index bd37b5cb8553..c7d323657798 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -82,22 +82,6 @@ static void ttm_eu_list_ref_sub(struct list_head *list)
}
}
-static int ttm_eu_wait_unreserved_locked(struct list_head *list,
- struct ttm_buffer_object *bo)
-{
- struct ttm_bo_global *glob = bo->glob;
- int ret;
-
- ttm_eu_del_from_lru_locked(list);
- spin_unlock(&glob->lru_lock);
- ret = ttm_bo_wait_unreserved(bo, true);
- spin_lock(&glob->lru_lock);
- if (unlikely(ret != 0))
- ttm_eu_backoff_reservation_locked(list);
- return ret;
-}
-
-
void ttm_eu_backoff_reservation(struct list_head *list)
{
struct ttm_validate_buffer *entry;
@@ -152,19 +136,23 @@ retry:
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
-retry_this_bo:
ret = ttm_bo_reserve_nolru(bo, true, true, true, val_seq);
switch (ret) {
case 0:
break;
case -EBUSY:
- ret = ttm_eu_wait_unreserved_locked(list, bo);
- if (unlikely(ret != 0)) {
- spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
- return ret;
- }
- goto retry_this_bo;
+ ttm_eu_del_from_lru_locked(list);
+ spin_unlock(&glob->lru_lock);
+ ret = ttm_bo_reserve_nolru(bo, true, false,
+ true, val_seq);
+ spin_lock(&glob->lru_lock);
+ if (!ret)
+ break;
+
+ if (unlikely(ret != -EAGAIN))
+ goto err;
+
+ /* fallthrough */
case -EAGAIN:
ttm_eu_backoff_reservation_locked(list);
spin_unlock(&glob->lru_lock);
@@ -174,18 +162,13 @@ retry_this_bo:
return ret;
goto retry;
default:
- ttm_eu_backoff_reservation_locked(list);
- spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
- return ret;
+ goto err;
}
entry->reserved = true;
if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
- ttm_eu_backoff_reservation_locked(list);
- spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
- return -EBUSY;
+ ret = -EBUSY;
+ goto err;
}
}
@@ -194,6 +177,12 @@ retry_this_bo:
ttm_eu_list_ref_sub(list);
return 0;
+
+err:
+ ttm_eu_backoff_reservation_locked(list);
+ spin_unlock(&glob->lru_lock);
+ ttm_eu_list_ref_sub(list);
+ return ret;
}
EXPORT_SYMBOL(ttm_eu_reserve_buffers);