From c38eb5d69e4586db36f0f08d2643f45d685d7d1f Mon Sep 17 00:00:00 2001 From: Thomas Hellstrom Date: Tue, 19 Oct 2010 09:01:01 +0200 Subject: [PATCH] --- yaml --- r: 218281 b: refs/heads/master c: e1efc9b6ac22c605fd326b3f6af9b393325d43b4 h: refs/heads/master i: 218279: 180fd3b0391119ea049713c8c5aab521fabedb3a v: v3 --- [refs] | 2 +- trunk/drivers/gpu/drm/ttm/ttm_bo.c | 171 ++++++++++++++++++----------- 2 files changed, 108 insertions(+), 65 deletions(-) diff --git a/[refs] b/[refs] index 04ddcadcb2b0..e10be7ab248d 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 40d857bba2915a4e8d82f44744a186bfdd1a46ea +refs/heads/master: e1efc9b6ac22c605fd326b3f6af9b393325d43b4 diff --git a/trunk/drivers/gpu/drm/ttm/ttm_bo.c b/trunk/drivers/gpu/drm/ttm/ttm_bo.c index 4a73f401644d..a1cb783c7131 100644 --- a/trunk/drivers/gpu/drm/ttm/ttm_bo.c +++ b/trunk/drivers/gpu/drm/ttm/ttm_bo.c @@ -455,100 +455,123 @@ static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo) wake_up_all(&bo->event_queue); } - -/** - * If bo idle, remove from delayed- and lru lists, and unref. - * If not idle, and already on delayed list, do nothing. - * If not idle, and not on delayed list, put on delayed list, - * up the list_kref and schedule a delayed list check. - */ - -static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all) +static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo) { struct ttm_bo_device *bdev = bo->bdev; struct ttm_bo_global *glob = bo->glob; - struct ttm_bo_driver *driver = bdev->driver; + struct ttm_bo_driver *driver; + void *sync_obj; + void *sync_obj_arg; + int put_count; int ret; spin_lock(&bo->lock); -retry: - (void) ttm_bo_wait(bo, false, false, !remove_all); - + (void) ttm_bo_wait(bo, false, false, true); if (!bo->sync_obj) { - int put_count; - - spin_unlock(&bo->lock); spin_lock(&glob->lru_lock); - ret = ttm_bo_reserve_locked(bo, false, !remove_all, false, 0); /** - * Someone else has the object reserved. Bail and retry. + * Lock inversion between bo::reserve and bo::lock here, + * but that's OK, since we're only trylocking. */ - if (unlikely(ret == -EBUSY)) { - spin_unlock(&glob->lru_lock); - spin_lock(&bo->lock); - goto requeue; - } - - /** - * We can re-check for sync object without taking - * the bo::lock since setting the sync object requires - * also bo::reserved. A busy object at this point may - * be caused by another thread starting an accelerated - * eviction. - */ + ret = ttm_bo_reserve_locked(bo, false, true, false, 0); - if (unlikely(bo->sync_obj)) { - atomic_set(&bo->reserved, 0); - wake_up_all(&bo->event_queue); - spin_unlock(&glob->lru_lock); - spin_lock(&bo->lock); - if (remove_all) - goto retry; - else - goto requeue; - } + if (unlikely(ret == -EBUSY)) + goto queue; + spin_unlock(&bo->lock); put_count = ttm_bo_del_from_lru(bo); - if (!list_empty(&bo->ddestroy)) { - list_del_init(&bo->ddestroy); - ++put_count; - } spin_unlock(&glob->lru_lock); ttm_bo_cleanup_memtype_use(bo); while (put_count--) kref_put(&bo->list_kref, ttm_bo_ref_bug); - return 0; + return; + } else { + spin_lock(&glob->lru_lock); } -requeue: +queue: + sync_obj = bo->sync_obj; + sync_obj_arg = bo->sync_obj_arg; + driver = bdev->driver; + + kref_get(&bo->list_kref); + list_add_tail(&bo->ddestroy, &bdev->ddestroy); + spin_unlock(&glob->lru_lock); + spin_unlock(&bo->lock); + + if (sync_obj) + driver->sync_obj_flush(sync_obj, sync_obj_arg); + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); +} + +/** + * function ttm_bo_cleanup_refs + * If bo idle, remove from delayed- and lru lists, and unref. + * If not idle, do nothing. + * + * @interruptible Any sleeps should occur interruptibly. + * @no_wait_reserve Never wait for reserve. Return -EBUSY instead. + * @no_wait_gpu Never wait for gpu. Return -EBUSY instead. + */ + +static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait_reserve, + bool no_wait_gpu) +{ + struct ttm_bo_global *glob = bo->glob; + int put_count; + int ret = 0; + +retry: + spin_lock(&bo->lock); + ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu); + spin_unlock(&bo->lock); + + if (unlikely(ret != 0)) + return ret; + spin_lock(&glob->lru_lock); - if (list_empty(&bo->ddestroy)) { - void *sync_obj = bo->sync_obj; - void *sync_obj_arg = bo->sync_obj_arg; + ret = ttm_bo_reserve_locked(bo, interruptible, + no_wait_reserve, false, 0); - kref_get(&bo->list_kref); - list_add_tail(&bo->ddestroy, &bdev->ddestroy); + if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) { spin_unlock(&glob->lru_lock); - spin_unlock(&bo->lock); + return ret; + } - if (sync_obj) - driver->sync_obj_flush(sync_obj, sync_obj_arg); - schedule_delayed_work(&bdev->wq, - ((HZ / 100) < 1) ? 1 : HZ / 100); - ret = 0; + /** + * We can re-check for sync object without taking + * the bo::lock since setting the sync object requires + * also bo::reserved. A busy object at this point may + * be caused by another thread recently starting an accelerated + * eviction. + */ - } else { + if (unlikely(bo->sync_obj)) { + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); spin_unlock(&glob->lru_lock); - spin_unlock(&bo->lock); - ret = -EBUSY; + goto retry; } - return ret; + put_count = ttm_bo_del_from_lru(bo); + list_del_init(&bo->ddestroy); + ++put_count; + + spin_unlock(&glob->lru_lock); + ttm_bo_cleanup_memtype_use(bo); + + while (put_count--) + kref_put(&bo->list_kref, ttm_bo_ref_bug); + + return 0; } /** @@ -580,7 +603,8 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all) } spin_unlock(&glob->lru_lock); - ret = ttm_bo_cleanup_refs(entry, remove_all); + ret = ttm_bo_cleanup_refs(entry, false, !remove_all, + !remove_all); kref_put(&entry->list_kref, ttm_bo_release_list); entry = nentry; @@ -623,7 +647,7 @@ static void ttm_bo_release(struct kref *kref) bo->vm_node = NULL; } write_unlock(&bdev->vm_lock); - ttm_bo_cleanup_refs(bo, false); + ttm_bo_cleanup_refs_or_queue(bo); kref_put(&bo->list_kref, ttm_bo_release_list); write_lock(&bdev->vm_lock); } @@ -731,6 +755,18 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev, bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru); kref_get(&bo->list_kref); + if (!list_empty(&bo->ddestroy)) { + spin_unlock(&glob->lru_lock); + ret = ttm_bo_cleanup_refs(bo, interruptible, + no_wait_reserve, no_wait_gpu); + kref_put(&bo->list_kref, ttm_bo_release_list); + + if (likely(ret == 0 || ret == -ERESTARTSYS)) + return ret; + + goto retry; + } + ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0); if (unlikely(ret == -EBUSY)) { @@ -1754,6 +1790,13 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink) struct ttm_buffer_object, swap); kref_get(&bo->list_kref); + if (!list_empty(&bo->ddestroy)) { + spin_unlock(&glob->lru_lock); + (void) ttm_bo_cleanup_refs(bo, false, false, false); + kref_put(&bo->list_kref, ttm_bo_release_list); + continue; + } + /** * Reserve buffer. Since we unlock while sleeping, we need * to re-check that nobody removed us from the swap-list while