[PATCH V20 11/15] drm/xe/ras: Cache disable_vram_page_offline policy at init

[Tejas Upadhyay <tejas.upadhyay@intel.com>]

The configfs disable_vram_page_offline attribute can only be
set before device bind, so its value is immutable at runtime.
Cache it in struct xe_drm_ras during xe_ras_init() to avoid
repeated configfs lookups on every fault.

Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
---
 drivers/gpu/drm/xe/xe_drm_ras_types.h | 3 +++
 drivers/gpu/drm/xe/xe_ras.c           | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_drm_ras_types.h b/drivers/gpu/drm/xe/xe_drm_ras_types.h
index 8d729ad6a264..0be218ba2db7 100644
--- a/drivers/gpu/drm/xe/xe_drm_ras_types.h
+++ b/drivers/gpu/drm/xe/xe_drm_ras_types.h
@@ -43,6 +43,9 @@ struct xe_drm_ras {
 
 	/** @info: info array for all types of errors */
 	struct xe_drm_ras_counter *info[DRM_XE_RAS_ERR_SEV_MAX];
+
+	/** @disable_vram_page_offline: cached configfs policy, immutable after init */
+	bool disable_vram_page_offline;
 };
 
 #endif
diff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c
index de4cb9ef7355..7a85735c57d5 100644
--- a/drivers/gpu/drm/xe/xe_ras.c
+++ b/drivers/gpu/drm/xe/xe_ras.c
@@ -3,6 +3,7 @@
  * Copyright © 2026 Intel Corporation
  */
 
+#include "xe_configfs.h"
 #include "xe_debugfs.h"
 #include "xe_device.h"
 #include "xe_drm_ras.h"
@@ -915,6 +916,14 @@ void xe_ras_init(struct xe_device *xe)
 {
 	int ret;
 
+	/*
+	 * TODO: Replace platform check with xe->info.has_disable_vram_page_offline
+	 * once the feature flag is plumbed through device info.
+	 */
+	if (xe->info.platform == XE_CRESCENTISLAND)
+		xe->ras.disable_vram_page_offline =
+			xe_configfs_get_disable_vram_page_offline(to_pci_dev(xe->drm.dev));
+
 	xe_drm_ras_init(xe);
 
 	if (!xe->info.has_sysctrl)
-- 
2.52.0