[Intel-xe] [PATCH 06/11] drm/xe: Notify userspace about GSC HW errors.

[Himal Prasad Ghimiray]

Send uevent incase of nonfatal errors reported by gsc.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_device_types.h |  3 +++
 drivers/gpu/drm/xe/xe_hw_error.c     | 20 ++++++++++++++++++++
 drivers/gpu/drm/xe/xe_hw_error.h     |  3 ++-
 drivers/gpu/drm/xe/xe_irq.c          |  4 ++++
 include/uapi/drm/xe_drm.h            |  9 +++++++++
 5 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 6aa4f4801d81..ff476a167be4 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -179,6 +179,9 @@ struct xe_tile {
 	struct tile_hw_errors {
 		unsigned long count[XE_TILE_HW_ERROR_MAX];
 	} errors;
+
+	/** @gsc_hw_err_work: worker for uevent to report GSC HW errors */
+	struct work_struct gsc_hw_err_work;
 };
 
 /**
diff --git a/drivers/gpu/drm/xe/xe_hw_error.c b/drivers/gpu/drm/xe/xe_hw_error.c
index eb76b8e6a338..76ae12df013c 100644
--- a/drivers/gpu/drm/xe/xe_hw_error.c
+++ b/drivers/gpu/drm/xe/xe_hw_error.c
@@ -3,6 +3,8 @@
  * Copyright © 2023 Intel Corporation
  */
 
+#include <drm/xe_drm.h>
+
 #include "xe_hw_error.h"
 
 #include "regs/xe_regs.h"
@@ -366,6 +368,22 @@ xe_gt_hw_error_handler(struct xe_gt *gt, const enum hardware_error hw_err)
 		xe_gt_hw_error_status_reg_handler(gt, hw_err);
 }
 
+void xe_gsc_hw_error_work(struct work_struct *work)
+{
+	struct xe_tile *tile = container_of(work, typeof(*tile), gsc_hw_err_work);
+	char *csc_hw_error_event[4];
+
+	csc_hw_error_event[0] = XE_GSC_HW_HEALTH_UEVENT "=1";
+	csc_hw_error_event[1] = "RESET_REQUIRED=1";
+	csc_hw_error_event[2] = kasprintf(GFP_KERNEL, "TILE_ID=%d", tile->id);
+	csc_hw_error_event[3] = NULL;
+
+	kobject_uevent_env(&tile->xe->drm.primary->kdev->kobj, KOBJ_CHANGE,
+			   csc_hw_error_event);
+
+	kfree(csc_hw_error_event[2]);
+}
+
 static void
 xe_gsc_hw_error_handler(struct xe_tile *tile, const enum hardware_error hw_err)
 {
@@ -423,6 +441,8 @@ xe_gsc_hw_error_handler(struct xe_tile *tile, const enum hardware_error hw_err)
 			drm_err_ratelimited(&tile_to_xe(tile)->drm,
 					    HW_ERR "GSC detected %s %s error, bit[%d] is set\n",
 					    errmsg, hw_err_str, errbit);
+
+			schedule_work(&tile->gsc_hw_err_work);
 		}
 		tile->errors.count[indx]++;
 	}
diff --git a/drivers/gpu/drm/xe/xe_hw_error.h b/drivers/gpu/drm/xe/xe_hw_error.h
index 155722a0af4c..ee7705b3343b 100644
--- a/drivers/gpu/drm/xe/xe_hw_error.h
+++ b/drivers/gpu/drm/xe/xe_hw_error.h
@@ -7,6 +7,7 @@
 
 #include <linux/stddef.h>
 #include <linux/types.h>
+#include <linux/workqueue.h>
 
 /* Error categories reported by hardware */
 enum hardware_error {
@@ -121,5 +122,5 @@ struct xe_tile;
 
 void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl);
 void xe_process_hw_errors(struct xe_device *xe);
-
+void xe_gsc_hw_error_work(struct work_struct *work);
 #endif
diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
index 06c9b43e2c71..285c657cc789 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -586,6 +586,10 @@ int xe_irq_install(struct xe_device *xe)
 	irq_handler_t irq_handler;
 	int err, irq;
 
+	struct xe_tile *tile = xe_device_get_root_tile(xe);
+
+	INIT_WORK(&tile->gsc_hw_err_work, xe_gsc_hw_error_work);
+
 	irq_handler = xe_irq_handler(xe);
 	if (!irq_handler) {
 		drm_err(&xe->drm, "No supported interrupt handler");
diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
index d48d8e3c898c..c45833defcc7 100644
--- a/include/uapi/drm/xe_drm.h
+++ b/include/uapi/drm/xe_drm.h
@@ -16,6 +16,15 @@ extern "C" {
  * subject to backwards-compatibility constraints.
  */
 
+/**
+ * DOC: uevent generated by xe on it's tile node.
+ *
+ * XE_GSC_HW_HEALTH_UEVENT - Event is generated when GSC reports HW
+ * errors. The value supplied with the event is always "RESET_REQUIRED=1".
+ * Additional information supplied is tile id on which error is reported.
+ */
+#define XE_GSC_HW_HEALTH_UEVENT "DEVICE_STATUS"
+
 /**
  * DOC: uevent generated by xe on it's pci node.
  *
-- 
2.25.1