[PATCH 2/3] drm/xe: account for dontneed in fdinfo purgeable

[Matthew Auld <matthew.auld@intel.com>]

Now that Xe supports explicit madvise WILLNEED/DONTNEED states,
userspace can mark memory in any placement as eligible for purging.
Update bo_meminfo to also include any BO explicitly marked as DONTNEED
in the purgeable statistics, ensuring fdinfo accurately reflects all
memory offered up for reclamation.

v2 (Sashiko):
  - Also update the drm_print_memory_stats() so we don't mask out !=
    SYSTEM

Assisted-by: Copilot:gemini-3.1-pro-preview
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Arvind Yadav <arvind.yadav@intel.com>
---
 drivers/gpu/drm/xe/xe_drm_client.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_drm_client.c b/drivers/gpu/drm/xe/xe_drm_client.c
index 81020b4b344e..e116fb562c4c 100644
--- a/drivers/gpu/drm/xe/xe_drm_client.c
+++ b/drivers/gpu/drm/xe/xe_drm_client.c
@@ -193,7 +193,7 @@ static void bo_meminfo(struct xe_bo *bo,
 		if (!dma_resv_test_signaled(bo->ttm.base.resv,
 					    DMA_RESV_USAGE_BOOKKEEP))
 			stats[mem_type].active += sz;
-		else if (mem_type == XE_PL_SYSTEM)
+		else if (mem_type == XE_PL_SYSTEM || xe_bo_madv_is_dontneed(bo))
 			stats[mem_type].purgeable += sz;
 	}
 }
@@ -273,8 +273,7 @@ static void show_meminfo(struct drm_printer *p, struct drm_file *file)
 					       &stats[mem_type],
 					       DRM_GEM_OBJECT_ACTIVE |
 					       DRM_GEM_OBJECT_RESIDENT |
-					       (mem_type != XE_PL_SYSTEM ? 0 :
-					       DRM_GEM_OBJECT_PURGEABLE),
+					       DRM_GEM_OBJECT_PURGEABLE,
 					       xe_mem_type_to_name[mem_type]);
 		}
 	}
-- 
2.54.0