drm/xe/uapi: loosen used tracking restriction

Currently this is hidden behind perfmon_capable() since this is
technically an info leak, given that this is a system wide metric.
However the granularity reported here is always PAGE_SIZE aligned, which
matches what the core kernel is already willing to expose to userspace
if querying how many free RAM pages there are on the system, and that
doesn't need any special privileges. In addition other drm drivers seem
happy to expose this.

The motivation here if with oneAPI where they want to use the system
wide 'used' reporting here, so not the per-client fdinfo stats. This has
also come up with some perf overlay applications wanting this
information.

Fixes: 1105ac1 ("drm/xe/uapi: restrict system wide accounting")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Joshua Santosh <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: <[email protected]> # v6.8+
Acked-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
(cherry picked from commit 4d0b035)
Signed-off-by: Lucas De Marchi <[email protected]>

Author: matt-auld

drivers/gpu/drm/xe/xe_query.c

@@ -276,8 +276,7 @@ static int query_mem_regions(struct xe_device *xe,
 	mem_regions->mem_regions[0].instance = 0;
 	mem_regions->mem_regions[0].min_page_size = PAGE_SIZE;
 	mem_regions->mem_regions[0].total_size = man->size << PAGE_SHIFT;
-	if (perfmon_capable())
-		mem_regions->mem_regions[0].used = ttm_resource_manager_usage(man);
+	mem_regions->mem_regions[0].used = ttm_resource_manager_usage(man);
 	mem_regions->num_mem_regions = 1;
 
 	for (i = XE_PL_VRAM0; i <= XE_PL_VRAM1; ++i) {
@@ -293,13 +292,11 @@ static int query_mem_regions(struct xe_device *xe,
 			mem_regions->mem_regions[mem_regions->num_mem_regions].total_size =
 				man->size;
 
-			if (perfmon_capable()) {
-				xe_ttm_vram_get_used(man,
-					&mem_regions->mem_regions
-					[mem_regions->num_mem_regions].used,
-					&mem_regions->mem_regions
-					[mem_regions->num_mem_regions].cpu_visible_used);
-			}
+			xe_ttm_vram_get_used(man,
+					     &mem_regions->mem_regions
+					     [mem_regions->num_mem_regions].used,
+					     &mem_regions->mem_regions
+					     [mem_regions->num_mem_regions].cpu_visible_used);
 
 			mem_regions->mem_regions[mem_regions->num_mem_regions].cpu_visible_size =
 				xe_ttm_vram_get_cpu_visible_size(man);