iris: Introduce a BO_ALLOC_NO_SUBALLOC flag and set it in a few places

We don't want to suballocate some buffers, such as ones that we know
we're intending to export to other clients, or ones with special
semantics (such as the workaround BO not having proper synchronization).

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12623>

src/gallium/drivers/iris/iris_batch.c

@@ -363,9 +363,10 @@ create_batch(struct iris_batch *batch)
    struct iris_screen *screen = batch->screen;
    struct iris_bufmgr *bufmgr = screen->bufmgr;
 
+   /* TODO: We probably could suballocate batches... */
    batch->bo = iris_bo_alloc(bufmgr, "command buffer",
                              BATCH_SZ + BATCH_RESERVED, 1,
-                             IRIS_MEMZONE_OTHER, 0);
+                             IRIS_MEMZONE_OTHER, BO_ALLOC_NO_SUBALLOC);
    iris_get_backing_bo(batch->bo)->real.kflags |= EXEC_OBJECT_CAPTURE;
    batch->map = iris_bo_map(NULL, batch->bo, MAP_READ | MAP_WRITE);
    batch->map_next = batch->map;

src/gallium/drivers/iris/iris_bufmgr.h

@@ -264,10 +264,11 @@ struct iris_bo {
    };
 };
 
-#define BO_ALLOC_ZEROED     (1<<0)
-#define BO_ALLOC_COHERENT   (1<<1)
-#define BO_ALLOC_SMEM       (1<<2)
-#define BO_ALLOC_SCANOUT    (1<<3)
+#define BO_ALLOC_ZEROED      (1<<0)
+#define BO_ALLOC_COHERENT    (1<<1)
+#define BO_ALLOC_SMEM        (1<<2)
+#define BO_ALLOC_SCANOUT     (1<<3)
+#define BO_ALLOC_NO_SUBALLOC (1<<4)
 
 /**
  * Allocate a buffer object.

src/gallium/drivers/iris/iris_resource.c

@@ -442,6 +442,10 @@ iris_resource_alloc_flags(const struct iris_screen *screen,
                        PIPE_RESOURCE_FLAG_MAP_PERSISTENT))
       flags |= BO_ALLOC_SMEM;
 
+   if ((templ->bind & PIPE_BIND_SHARED) ||
+       util_format_get_num_planes(templ->format) > 1)
+      flags |= BO_ALLOC_NO_SUBALLOC;
+
    return flags;
 }
 

src/gallium/drivers/iris/iris_screen.c

@@ -805,7 +805,7 @@ iris_screen_create(int fd, const struct pipe_screen_config *config)
 
    screen->workaround_bo =
       iris_bo_alloc(screen->bufmgr, "workaround", 4096, 1,
-                    IRIS_MEMZONE_OTHER, 0);
+                    IRIS_MEMZONE_OTHER, BO_ALLOC_NO_SUBALLOC);
    if (!screen->workaround_bo)
       return NULL;