r300g: fix a race between CS and SET_TILING ioctls

3 files changed, 21 insertions, 6 deletions

diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
index afb8131acb..3094337a3c 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
@@ -394,13 +394,26 @@ static void radeon_bo_get_tiling(struct r300_winsys_bo *_buf,
 }
 
 static void radeon_bo_set_tiling(struct r300_winsys_bo *_buf,
+                                 struct r300_winsys_cs *rcs,
                                  enum r300_buffer_tiling microtiled,
                                  enum r300_buffer_tiling macrotiled,
                                  uint32_t pitch)
 {
     struct radeon_bo *bo = get_radeon_bo(pb_buffer(_buf));
+    struct radeon_drm_cs *cs = radeon_drm_cs(rcs);
     struct drm_radeon_gem_set_tiling args = {};
 
+    /* Tiling determines how DRM treats the buffer data.
+     * We must flush CS when changing it if the buffer is referenced. */
+    if (cs && radeon_bo_is_referenced_by_cs(cs, bo)) {
+        radeon_drm_cs_flush(rcs);
+        radeon_drm_cs_sync_flush(rcs);
+    }
+
+    while (p_atomic_read(&bo->num_active_ioctls)) {
+        sched_yield();
+    }
+
     if (microtiled == R300_BUFFER_TILED)
         args.tiling_flags |= RADEON_BO_FLAGS_MICRO_TILE;
     else if (microtiled == R300_BUFFER_SQUARETILED)
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
index b4f5c9f6a8..8f6f4a1f35 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_cs.c
@@ -330,7 +330,7 @@ static void radeon_drm_cs_write_reloc(struct r300_winsys_cs *rcs,
     OUT_CS(&cs->base, index * RELOC_DWORDS);
 }
 
-static PIPE_THREAD_ROUTINE(radeon_drm_cs_emit_async, param)
+static PIPE_THREAD_ROUTINE(radeon_drm_cs_emit_ioctl, param)
 {
     struct radeon_cs_context *csc = (struct radeon_cs_context*)param;
     unsigned i;
@@ -355,7 +355,7 @@ static PIPE_THREAD_ROUTINE(radeon_drm_cs_emit_async, param)
     return NULL;
 }
 
-static void radeon_drm_cs_sync_flush(struct r300_winsys_cs *rcs)
+void radeon_drm_cs_sync_flush(struct r300_winsys_cs *rcs)
 {
     struct radeon_drm_cs *cs = radeon_drm_cs(rcs);
 
@@ -368,7 +368,7 @@ static void radeon_drm_cs_sync_flush(struct r300_winsys_cs *rcs)
 
 DEBUG_GET_ONCE_BOOL_OPTION(thread, "RADEON_THREAD", TRUE)
 
-static void radeon_drm_cs_emit(struct r300_winsys_cs *rcs)
+void radeon_drm_cs_flush(struct r300_winsys_cs *rcs)
 {
     struct radeon_drm_cs *cs = radeon_drm_cs(rcs);
     struct radeon_cs_context *tmp;
@@ -385,10 +385,10 @@ static void radeon_drm_cs_emit(struct r300_winsys_cs *rcs)
             p_atomic_inc(&cs->csc->relocs_bo[i]->num_active_ioctls);
 
         if (debug_get_option_thread()) {
-            cs->thread = pipe_thread_create(radeon_drm_cs_emit_async, cs->csc);
+            cs->thread = pipe_thread_create(radeon_drm_cs_emit_ioctl, cs->csc);
             assert(cs->thread);
         } else {
-            radeon_drm_cs_emit_async(cs->csc);
+            radeon_drm_cs_emit_ioctl(cs->csc);
         }
     }
 
@@ -440,7 +440,7 @@ void radeon_drm_cs_init_functions(struct radeon_drm_winsys *ws)
     ws->base.cs_add_reloc = radeon_drm_cs_add_reloc;
     ws->base.cs_validate = radeon_drm_cs_validate;
     ws->base.cs_write_reloc = radeon_drm_cs_write_reloc;
-    ws->base.cs_flush = radeon_drm_cs_emit;
+    ws->base.cs_flush = radeon_drm_cs_flush;
     ws->base.cs_sync_flush = radeon_drm_cs_sync_flush;
     ws->base.cs_set_flush = radeon_drm_cs_set_flush;
     ws->base.cs_is_buffer_referenced = radeon_bo_is_referenced;
diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_cs.h b/src/gallium/winsys/radeon/drm/radeon_drm_cs.h
index 486fd237fc..4cc97f37e0 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_cs.h
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_cs.h
@@ -96,6 +96,8 @@ static INLINE boolean radeon_bo_is_referenced_by_any_cs(struct radeon_bo *bo)
     return bo->num_cs_references;
 }
 
+void radeon_drm_cs_flush(struct r300_winsys_cs *rcs);
+void radeon_drm_cs_sync_flush(struct r300_winsys_cs *rcs);
 void radeon_drm_cs_init_functions(struct radeon_drm_winsys *ws);
 
 #endif