[Intel-xe] [PATCH v6 2/6] drm/xe/uapi: restrict system wide accounting

[Matthew Auld]

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 <matthew.auld at intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Cc: Filip Hazubski <filip.hazubski at intel.com>
Cc: Carl Zhang <carl.zhang at intel.com>
Cc: Effie Yu <effie.yu at intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Reviewed-by: José Roberto de Souza <jose.souza at intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
 drivers/gpu/drm/xe/xe_query.c | 12 +++++++++---
 1 file 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++;
 		}
 	}
 
-- 
2.41.0