drm/xe: account for dontneed in fdinfo purgeable

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>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260625152054.450125-7-matthew.auld@intel.com

diff --git a/drivers/gpu/drm/xe/xe_drm_client.c b/drivers/gpu/drm/xe/xe_drm_client.c
index 81020b4b344e08bd1164fb6bd77a72e46eb3f7f3..e116fb562c4c6001fec378283245bb3a7af8a058 100644 (file)
--- 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]);
                }
        }