drm/vmwgfx: Add a debug callback to mobid resource manager

Mob/GMR id resource manager was lacking the debug print callback
which meant that during memory errors we weren't getting the details
which are needed to fix those errors.

Kernel logs need to contain the information about used/max pages
by the Mob/GMR id resource manager as well as the maximum number
of id's they're allowed to allocate.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-3-zack@kde.org

drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c

@@ -42,6 +42,7 @@ struct vmwgfx_gmrid_man {
 	uint32_t max_gmr_ids;
 	uint32_t max_gmr_pages;
 	uint32_t used_gmr_pages;
+	uint8_t type;
 };
 
 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
@@ -132,6 +133,18 @@ static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
 	kfree(res);
 }
 
+static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
+				struct drm_printer *printer)
+{
+	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
+
+	BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
+
+	drm_printf(printer, "%s's used: %u pages, max: %u pages, %u id's\n",
+		   (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
+		   gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
+}
+
 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
 
 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
@@ -146,12 +159,12 @@ int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
 	man = &gman->manager;
 
 	man->func = &vmw_gmrid_manager_func;
-	/* TODO: This is most likely not correct */
 	man->use_tt = true;
 	ttm_resource_manager_init(man, 0);
 	spin_lock_init(&gman->lock);
 	gman->used_gmr_pages = 0;
 	ida_init(&gman->gmr_ida);
+	gman->type = type;
 
 	switch (type) {
 	case VMW_PL_GMR:
@@ -190,4 +203,5 @@ void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
 	.alloc = vmw_gmrid_man_get_node,
 	.free = vmw_gmrid_man_put_node,
+	.debug = vmw_gmrid_man_debug
 };