On 11/12/2012 03:00 PM, Maarten Lankhorst wrote:
Just use the return error from ttm_mem_evict_first instead.
Here driver need to be able to evict a memory type completely, because they might shut down the memory type or clear it for some legacy usage, suspending or whatever, so returning 0 on -EBUSY isn't sufficient, we need at least a list empty check, and a shared reservation at this point is illegal.
This is a point where the mechanism to exclude other reservers is needed, as we discussed previously. vmwgfx is using the ttm lock, but will of course adapt if a new mechanism is emerging.
Thanks, /Thomas
Signed-off-by: Maarten Lankhorst <maarten.lankho...@canonical.com> --- drivers/gpu/drm/ttm/ttm_bo.c | 27 ++++++++------------------- 1 file changed, 8 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 74d6e7c..a3383a7 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -1302,29 +1302,18 @@ EXPORT_SYMBOL(ttm_bo_create); static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev, unsigned mem_type, bool allow_errors) { - struct ttm_mem_type_manager *man = &bdev->man[mem_type]; - struct ttm_bo_global *glob = bdev->glob; - int ret; - - /* - * Can't use standard list traversal since we're unlocking. - */ + int ret = 0;- spin_lock(&glob->lru_lock);- while (!list_empty(&man->lru)) { - spin_unlock(&glob->lru_lock); + while (!ret) { ret = ttm_mem_evict_first(bdev, mem_type, false, false, false); - if (ret) { - if (allow_errors) { - return ret; - } else { - pr_err("Cleanup eviction failed\n"); - } + if (ret == -EBUSY) + return 0; + else if (ret && !allow_errors) { + pr_err("Cleanup eviction failed\n"); + ret = 0; } - spin_lock(&glob->lru_lock); } - spin_unlock(&glob->lru_lock); - return 0; + return ret; }int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
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