[PATCH v5 9/9] drm/xe/xe_hw_error: Add fault injection to trigger csc error handler

[Riana Tauro]

Add a debugfs fault handler to trigger csc error handler that
wedges the device and sends drm uevent

v2: add debugfs only for bmg (Umesh)

Signed-off-by: Riana Tauro <riana.ta...@intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c  |  3 +++
 drivers/gpu/drm/xe/xe_hw_error.c | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 26e9d146ccbf..95057c04a022 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -31,6 +31,7 @@
 #endif
 
 DECLARE_FAULT_ATTR(gt_reset_failure);
+DECLARE_FAULT_ATTR(inject_csc_hw_error);
 
 static struct xe_device *node_to_xe(struct drm_info_node *node)
 {
@@ -294,6 +295,8 @@ void xe_debugfs_register(struct xe_device *xe)
        xe_pxp_debugfs_register(xe->pxp);
 
        fault_create_debugfs_attr("fail_gt_reset", root, &gt_reset_failure);
+       if (xe->info.platform == XE_BATTLEMAGE)
+               fault_create_debugfs_attr("inject_csc_hw_error", root, 
&inject_csc_hw_error);
 
        if (IS_SRIOV_PF(xe))
                xe_sriov_pf_debugfs_register(xe, root);
diff --git a/drivers/gpu/drm/xe/xe_hw_error.c b/drivers/gpu/drm/xe/xe_hw_error.c
index c5b3e8c207fa..db7417c390ff 100644
--- a/drivers/gpu/drm/xe/xe_hw_error.c
+++ b/drivers/gpu/drm/xe/xe_hw_error.c
@@ -3,6 +3,8 @@
  * Copyright © 2025 Intel Corporation
  */
 
+#include <linux/fault-inject.h>
+
 #include "regs/xe_gsc_regs.h"
 #include "regs/xe_hw_error_regs.h"
 #include "regs/xe_irq_regs.h"
@@ -13,6 +15,7 @@
 #include "xe_survivability_mode.h"
 
 #define  HEC_UNCORR_FW_ERR_BITS 4
+extern struct fault_attr inject_csc_hw_error;
 
 /* Error categories reported by hardware */
 enum hardware_error {
@@ -43,6 +46,11 @@ static const char *hw_error_to_str(const enum hardware_error 
hw_err)
        }
 }
 
+static bool fault_inject_csc_hw_error(void)
+{
+       return should_fail(&inject_csc_hw_error, 1);
+}
+
 static void csc_hw_error_work(struct work_struct *work)
 {
        struct xe_tile *tile = container_of(work, typeof(*tile), 
csc_hw_error_work);
@@ -130,6 +138,9 @@ void xe_hw_error_irq_handler(struct xe_tile *tile, const 
u32 master_ctl)
 {
        enum hardware_error hw_err;
 
+       if (fault_inject_csc_hw_error())
+               schedule_work(&tile->csc_hw_error_work);
+
        for (hw_err = 0; hw_err < HARDWARE_ERROR_MAX; hw_err++)
                if (master_ctl & ERROR_IRQ(hw_err))
                        hw_error_source_handler(tile, hw_err);
-- 
2.47.1