drm/xe/uapi: restrict system wide accounting

Since this is considered an info leak (system wide accounting), rather
hide behind perfmon_capable().

v2:
  - Without perfmon_capable() it likely makes more sense to report as zero,
    instead of reporting as used == total size. This should give similar
    behaviour as i915 which rather tracks free instead of used.

Signed-off-by: Matthew Auld <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Gwan-gyeong Mun <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Filip Hazubski <[email protected]>
Cc: Carl Zhang <[email protected]>
Cc: Effie Yu <[email protected]>
Cc: Gwan-gyeong Mun <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Reviewed-by: Gwan-gyeong Mun <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/gpu/drm/xe/xe_query.c b/drivers/gpu/drm/xe/xe_query.c
index c4165fa3428e..15e171ca7e62 100644
--- a/drivers/gpu/drm/xe/xe_query.c
+++ b/drivers/gpu/drm/xe/xe_query.c
@@ -128,7 +128,8 @@ static int query_memory_usage(struct xe_device *xe,
 	usage->regions[0].min_page_size = PAGE_SIZE;
 	usage->regions[0].max_page_size = PAGE_SIZE;
 	usage->regions[0].total_size = man->size << PAGE_SHIFT;
-	usage->regions[0].used = ttm_resource_manager_usage(man);
+	if (perfmon_capable())
+		usage->regions[0].used = ttm_resource_manager_usage(man);
 	usage->num_regions = 1;
 
 	for (i = XE_PL_VRAM0; i <= XE_PL_VRAM1; ++i) {
@@ -145,8 +146,13 @@ static int query_memory_usage(struct xe_device *xe,
 				SZ_1G;
 			usage->regions[usage->num_regions].total_size =
 				man->size;
-			usage->regions[usage->num_regions++].used =
-				ttm_resource_manager_usage(man);
+
+			if (perfmon_capable()) {
+				usage->regions[usage->num_regions].used =
+					ttm_resource_manager_usage(man);
+			}
+
+			usage->num_regions++;
 		}
 	}