drm/ttm: optionally move duplicates to a separate list

This patch adds an optional list_head parameter to ttm_eu_reserve_buffers.
If specified duplicates in the execbuf list are no longer reported as errors,
but moved to this list instead.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 8ce508e76208..3820ae97a030 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -93,7 +93,8 @@ EXPORT_SYMBOL(ttm_eu_backoff_reservation);
  */
 
 int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
-                           struct list_head *list, bool intr)
+                           struct list_head *list, bool intr,
+                           struct list_head *dups)
 {
         struct ttm_bo_global *glob;
         struct ttm_validate_buffer *entry;
@@ -117,6 +118,13 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
                         __ttm_bo_unreserve(bo);
 
                         ret = -EBUSY;
+
+                } else if (ret == -EALREADY && dups) {
+                        struct ttm_validate_buffer *safe = entry;
+                        entry = list_prev_entry(entry, head);
+                        list_del(&safe->head);
+                        list_add(&safe->head, dups);
+                        continue;
                 }
 
                 if (!ret) {