vc4: When the create ioctl fails, free our cache and try again.

This greatly increases the pressure you can put on the driver before
create fails.  Ultimately we need to let the kernel take control of
our cached BOs and just take them from us (and other clients)
directly, but this is a very easy patch for the moment.

Cc: "11.0" <mesa-stable@lists.freedesktop.org>

1 files changed, 24 insertions, 5 deletions

diff --git a/src/gallium/drivers/vc4/vc4_bufmgr.c b/src/gallium/drivers/vc4/vc4_bufmgr.c
index 52ba8ab19ef..2f822f04c21 100644
--- a/src/gallium/drivers/vc4/vc4_bufmgr.c
+++ b/src/gallium/drivers/vc4/vc4_bufmgr.c
@@ -37,6 +37,9 @@
 static bool dump_stats = false;
 
 static void
+vc4_bo_cache_free_all(struct vc4_bo_cache *cache);
+
+static void
 vc4_bo_dump_stats(struct vc4_screen *screen)
 {
         struct vc4_bo_cache *cache = &screen->bo_cache;
@@ -136,6 +139,8 @@ vc4_bo_alloc(struct vc4_screen *screen, uint32_t size, const char *name)
         bo->name = name;
         bo->private = true;
 
+        bool cleared_and_retried = false;
+retry:
         if (!using_vc4_simulator) {
                 struct drm_vc4_create_bo create;
                 memset(&create, 0, sizeof(create));
@@ -157,6 +162,12 @@ vc4_bo_alloc(struct vc4_screen *screen, uint32_t size, const char *name)
                 assert(create.size >= size);
         }
         if (ret != 0) {
+                if (!list_empty(&screen->bo_cache.time_list) &&
+                    !cleared_and_retried) {
+                        cleared_and_retried = true;
+                        vc4_bo_cache_free_all(&screen->bo_cache);
+                        goto retry;
+                }
                 fprintf(stderr, "create ioctl failure\n");
                 abort();
         }
@@ -248,6 +259,18 @@ free_stale_bos(struct vc4_screen *screen, time_t time)
         }
 }
 
+static void
+vc4_bo_cache_free_all(struct vc4_bo_cache *cache)
+{
+        pipe_mutex_lock(cache->lock);
+        list_for_each_entry_safe(struct vc4_bo, bo, &cache->time_list,
+                                 time_list) {
+                vc4_bo_remove_from_cache(cache, bo);
+                vc4_bo_free(bo);
+        }
+        pipe_mutex_unlock(cache->lock);
+}
+
 void
 vc4_bo_last_unreference_locked_timed(struct vc4_bo *bo, time_t time)
 {
@@ -600,11 +623,7 @@ vc4_bufmgr_destroy(struct pipe_screen *pscreen)
         struct vc4_screen *screen = vc4_screen(pscreen);
         struct vc4_bo_cache *cache = &screen->bo_cache;
 
-        list_for_each_entry_safe(struct vc4_bo, bo, &cache->time_list,
-                                 time_list) {
-                vc4_bo_remove_from_cache(cache, bo);
-                vc4_bo_free(bo);
-        }
+        vc4_bo_cache_free_all(cache);
 
         if (dump_stats) {
                 fprintf(stderr, "BO stats after screen destroy:\n");