drm/ttm: allow fence to be added as shared

This patch adds a new flag to the ttm_validate_buffer list to
add the fence as shared to the reservation object.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index adafc0f8ec06..8ce508e76208 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -119,8 +119,14 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
                         ret = -EBUSY;
                 }
 
-                if (!ret)
-                        continue;
+                if (!ret) {
+                        if (!entry->shared)
+                                continue;
+
+                        ret = reservation_object_reserve_shared(bo->resv);
+                        if (!ret)
+                                continue;
+                }
 
                 /* uh oh, we lost out, drop every reservation and try
                  * to only reserve this buffer, then start over if
@@ -136,6 +142,9 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
                         ret = 0;
                 }
 
+                if (!ret && entry->shared)
+                        ret = reservation_object_reserve_shared(bo->resv);
+
                 if (unlikely(ret != 0)) {
                         if (ret == -EINTR)
                                 ret = -ERESTARTSYS;
@@ -183,7 +192,10 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
 
         list_for_each_entry(entry, list, head) {
                 bo = entry->bo;
-                reservation_object_add_excl_fence(bo->resv, fence);
+                if (entry->shared)
+                        reservation_object_add_shared_fence(bo->resv, fence);
+                else
+                        reservation_object_add_excl_fence(bo->resv, fence);
                 ttm_bo_add_to_lru(bo);
                 __ttm_bo_unreserve(bo);
         }