[PATCH 04/12] drm/ttm: add common accounting to the resource mgr v2

["Christian König" <ckoenig.leichtzumerken@xxxxxxxxx>]

It makes sense to have this in the common manager for debugging and
accounting of how much resources are used.

v2: cleanup kerneldoc a bit

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Huang Rui <ray.huang@xxxxxxx>
---
 drivers/gpu/drm/ttm/ttm_resource.c |  8 ++++++++
 include/drm/ttm/ttm_resource.h     | 20 +++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 7fdd58b53c61..b8362492980d 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -33,6 +33,8 @@ void ttm_resource_init(struct ttm_buffer_object *bo,
                        const struct ttm_place *place,
                        struct ttm_resource *res)
 {
+	struct ttm_resource_manager *man;
+
 	res->start = 0;
 	res->num_pages = PFN_UP(bo->base.size);
 	res->mem_type = place->mem_type;
@@ -42,12 +44,16 @@ void ttm_resource_init(struct ttm_buffer_object *bo,
 	res->bus.is_iomem = false;
 	res->bus.caching = ttm_cached;
 	res->bo = bo;
+
+	man = ttm_manager_type(bo->bdev, place->mem_type);
+	atomic64_add(bo->base.size, &man->usage);
 }
 EXPORT_SYMBOL(ttm_resource_init);
 
 void ttm_resource_fini(struct ttm_resource_manager *man,
 		       struct ttm_resource *res)
 {
+	atomic64_sub(res->bo->base.size, &man->usage);
 }
 EXPORT_SYMBOL(ttm_resource_fini);
 
@@ -149,6 +155,7 @@ void ttm_resource_manager_init(struct ttm_resource_manager *man,
 	spin_lock_init(&man->move_lock);
 	man->bdev = bdev;
 	man->size = p_size;
+	atomic64_set(&man->usage, 0);
 
 	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
 		INIT_LIST_HEAD(&man->lru[i]);
@@ -221,6 +228,7 @@ void ttm_resource_manager_debug(struct ttm_resource_manager *man,
 	drm_printf(p, "  use_type: %d\n", man->use_type);
 	drm_printf(p, "  use_tt: %d\n", man->use_tt);
 	drm_printf(p, "  size: %llu\n", man->size);
+	drm_printf(p, "  usage: %llu\n", atomic64_read(&man->usage));
 	if (man->func->debug)
 		man->func->debug(man, p);
 }
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index 69eea9d6399b..3d391279b33f 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -27,6 +27,7 @@
 
 #include <linux/types.h>
 #include <linux/mutex.h>
+#include <linux/atomic.h>
 #include <linux/dma-buf-map.h>
 #include <linux/dma-fence.h>
 #include <drm/drm_print.h>
@@ -132,8 +133,12 @@ struct ttm_resource_manager {
 	/*
 	 * Protected by the global->lru_lock.
 	 */
-
 	struct list_head lru[TTM_MAX_BO_PRIORITY];
+
+	/**
+	 * @usage: How much of the region is used, has its own protection.
+	 */
+	atomic64_t usage;
 };
 
 /**
@@ -261,6 +266,19 @@ ttm_resource_manager_cleanup(struct ttm_resource_manager *man)
 	man->move = NULL;
 }
 
+/**
+ * ttm_resource_manager_usage
+ *
+ * @man: A memory manager object.
+ *
+ * Return how many resources are currently used.
+ */
+static inline uint64_t
+ttm_resource_manager_usage(struct ttm_resource_manager *man)
+{
+	return atomic64_read(&man->usage);
+}
+
 void ttm_resource_init(struct ttm_buffer_object *bo,
                        const struct ttm_place *place,
                        struct ttm_resource *res);
-- 
2.25.1