drm/ttm: add debugfs directory v2

As far as I can tell the buffer_count was never used by an
userspace application.

The number of BOs in the system is far better suited in
debugfs than sysfs and we now should be able to add other
information here as well.

v2: add that additionally to sysfs

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/414954/

1 files changed, 3 insertions, 45 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index b65f4b12f986..c289a6a37ff9 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -44,8 +44,6 @@
 
 #include "ttm_module.h"
 
-static void ttm_bo_global_kobj_release(struct kobject *kobj);
-
 /*
  * ttm_global_mutex - protecting the global BO state
  */
@@ -54,11 +52,6 @@ unsigned ttm_bo_glob_use_count;
 struct ttm_bo_global ttm_bo_glob;
 EXPORT_SYMBOL(ttm_bo_glob);
 
-static struct attribute ttm_bo_count = {
-	.name = "bo_count",
-	.mode = S_IRUGO
-};
-
 /* default destructor */
 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
 {
@@ -84,32 +77,6 @@ static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
 	}
 }
 
-static ssize_t ttm_bo_global_show(struct kobject *kobj,
-				  struct attribute *attr,
-				  char *buffer)
-{
-	struct ttm_bo_global *glob =
-		container_of(kobj, struct ttm_bo_global, kobj);
-
-	return snprintf(buffer, PAGE_SIZE, "%d\n",
-				atomic_read(&glob->bo_count));
-}
-
-static struct attribute *ttm_bo_global_attrs[] = {
-	&ttm_bo_count,
-	NULL
-};
-
-static const struct sysfs_ops ttm_bo_global_ops = {
-	.show = &ttm_bo_global_show
-};
-
-static struct kobj_type ttm_bo_glob_kobj_type  = {
-	.release = &ttm_bo_global_kobj_release,
-	.sysfs_ops = &ttm_bo_global_ops,
-	.default_attrs = ttm_bo_global_attrs
-};
-
 static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 {
 	struct ttm_bo_device *bdev = bo->bdev;
@@ -1228,14 +1195,6 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
 }
 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
 
-static void ttm_bo_global_kobj_release(struct kobject *kobj)
-{
-	struct ttm_bo_global *glob =
-		container_of(kobj, struct ttm_bo_global, kobj);
-
-	__free_page(glob->dummy_read_page);
-}
-
 static void ttm_bo_global_release(void)
 {
 	struct ttm_bo_global *glob = &ttm_bo_glob;
@@ -1247,6 +1206,7 @@ static void ttm_bo_global_release(void)
 	kobject_del(&glob->kobj);
 	kobject_put(&glob->kobj);
 	ttm_mem_global_release(&ttm_mem_glob);
+	__free_page(glob->dummy_read_page);
 	memset(glob, 0, sizeof(*glob));
 out:
 	mutex_unlock(&ttm_global_mutex);
@@ -1279,10 +1239,8 @@ static int ttm_bo_global_init(void)
 	INIT_LIST_HEAD(&glob->device_list);
 	atomic_set(&glob->bo_count, 0);
 
-	ret = kobject_init_and_add(
-		&glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
-	if (unlikely(ret != 0))
-		kobject_put(&glob->kobj);
+	debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
+				&glob->bo_count);
 out:
 	mutex_unlock(&ttm_global_mutex);
 	return ret;