[PATCH v6 4/5] drm: add drm_memory_stats_is_zero

[Yunxiang Li <Yunxiang.Li@amd.com>]

Add a helper to check if the memory stats is zero, this will be used to
check for memory accounting errors.

Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
---
 drivers/gpu/drm/drm_file.c | 9 +++++++++
 include/drm/drm_file.h     | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index 714e42b051080..75ed701d80f74 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -859,6 +859,15 @@ static void print_size(struct drm_printer *p, const char *stat,
 	drm_printf(p, "drm-%s-%s:\t%llu%s\n", stat, region, sz, units[u]);
 }
 
+int drm_memory_stats_is_zero(const struct drm_memory_stats *stats) {
+	return (stats->shared == 0 &&
+		stats->private == 0 &&
+		stats->resident == 0 &&
+		stats->purgeable == 0 &&
+		stats->active == 0);
+}
+EXPORT_SYMBOL(drm_memory_stats_is_zero);
+
 /**
  * drm_print_memory_stats - A helper to print memory stats
  * @p: The printer to print output to
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index ab230d3af138d..7f91e35d027d9 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -477,6 +477,7 @@ struct drm_memory_stats {
 
 enum drm_gem_object_status;
 
+int drm_memory_stats_is_zero(const struct drm_memory_stats *stats);
 void drm_print_memory_stats(struct drm_printer *p,
 			    const struct drm_memory_stats *stats,
 			    enum drm_gem_object_status supported_status,
-- 
2.34.1