drm/xe/vf: Don't expose privileged GT debugfs files if VF

Some of the debugfs files require access to the registers that are
not accessible to the VFs. Don't expose those files on VF drivers.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Tested-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Reviewed-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250403142635.1821-4-michal.wajdeczko@intel.com

Author: mwajdecz

drivers/gpu/drm/xe/xe_gt_debugfs.c

@@ -299,20 +299,20 @@ static int hwconfig(struct xe_gt *gt, struct drm_printer *p)
 	return 0;
 }
 
-static const struct drm_info_list debugfs_list[] = {
-	{"hw_engines", .show = xe_gt_debugfs_simple_show, .data = hw_engines},
+/*
+ * only for GT debugfs files which can be safely used on the VF as well:
+ * - without access to the GT privileged registers
+ * - without access to the PF specific data
+ */
+static const struct drm_info_list vf_safe_debugfs_list[] = {
 	{"force_reset", .show = xe_gt_debugfs_simple_show, .data = force_reset},
 	{"force_reset_sync", .show = xe_gt_debugfs_simple_show, .data = force_reset_sync},
 	{"sa_info", .show = xe_gt_debugfs_simple_show, .data = sa_info},
 	{"topology", .show = xe_gt_debugfs_simple_show, .data = topology},
-	{"steering", .show = xe_gt_debugfs_simple_show, .data = steering},
 	{"ggtt", .show = xe_gt_debugfs_simple_show, .data = ggtt},
-	{"powergate_info", .show = xe_gt_debugfs_simple_show, .data = powergate_info},
 	{"register-save-restore", .show = xe_gt_debugfs_simple_show, .data = register_save_restore},
 	{"workarounds", .show = xe_gt_debugfs_simple_show, .data = workarounds},
 	{"tunings", .show = xe_gt_debugfs_simple_show, .data = tunings},
-	{"pat", .show = xe_gt_debugfs_simple_show, .data = pat},
-	{"mocs", .show = xe_gt_debugfs_simple_show, .data = mocs},
 	{"default_lrc_rcs", .show = xe_gt_debugfs_simple_show, .data = rcs_default_lrc},
 	{"default_lrc_ccs", .show = xe_gt_debugfs_simple_show, .data = ccs_default_lrc},
 	{"default_lrc_bcs", .show = xe_gt_debugfs_simple_show, .data = bcs_default_lrc},
@@ -322,6 +322,15 @@ static const struct drm_info_list debugfs_list[] = {
 	{"hwconfig", .show = xe_gt_debugfs_simple_show, .data = hwconfig},
 };
 
+/* everything else should be added here */
+static const struct drm_info_list pf_only_debugfs_list[] = {
+	{"hw_engines", .show = xe_gt_debugfs_simple_show, .data = hw_engines},
+	{"mocs", .show = xe_gt_debugfs_simple_show, .data = mocs},
+	{"pat", .show = xe_gt_debugfs_simple_show, .data = pat},
+	{"powergate_info", .show = xe_gt_debugfs_simple_show, .data = powergate_info},
+	{"steering", .show = xe_gt_debugfs_simple_show, .data = steering},
+};
+
 void xe_gt_debugfs_register(struct xe_gt *gt)
 {
 	struct xe_device *xe = gt_to_xe(gt);
@@ -345,10 +354,15 @@ void xe_gt_debugfs_register(struct xe_gt *gt)
 	 */
 	root->d_inode->i_private = gt;
 
-	drm_debugfs_create_files(debugfs_list,
-				 ARRAY_SIZE(debugfs_list),
+	drm_debugfs_create_files(vf_safe_debugfs_list,
+				 ARRAY_SIZE(vf_safe_debugfs_list),
 				 root, minor);
 
+	if (!IS_SRIOV_VF(xe))
+		drm_debugfs_create_files(pf_only_debugfs_list,
+					 ARRAY_SIZE(pf_only_debugfs_list),
+					 root, minor);
+
 	xe_uc_debugfs_register(&gt->uc, root);
 
 	if (IS_SRIOV_PF(xe))