[Intel-xe] [PATCH v3 06/11] drm/xe: Notify userspace about GSC HW errors.

[Himal Prasad Ghimiray]

Send uevent incase of nonfatal errors reported by gsc.

TODO: Since XE_RESET_FAILED_UEVENT and XE_GSC_HW_HEALTH_UEVENT
both pass DEVICE_STATUS=NEEDS_RESET. Use same Uevent to determine
the RESET_REQUIRED and pass reasons for reset required as additional
info.

v2
- No need to provide tile info in uevent because error is
accepted only in tile0. (Aravind)

v3
- Use pci node to send uevent.
- Pass RESET_REASON for uevent.

Cc: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>
Cc: Brian Welty <brian.welty at intel.com>
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     | 17 +++++++++++++++++
 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, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 3b371e0f6168..bc7b545ce37b 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -196,6 +196,9 @@ struct xe_tile {
 	struct tile_hw_errors {
 		struct xarray hw_error;
 	} 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 84533ef6a51e..644e63d4d717 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"
@@ -378,6 +380,20 @@ xe_gt_hw_error_handler(struct xe_gt *gt, const enum hardware_error hw_err)
 		xe_gt_hw_error_log_vector_reg(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);
+	struct pci_dev *pdev = to_pci_dev(tile_to_xe(tile)->drm.dev);
+	char *csc_hw_error_event[3];
+
+	csc_hw_error_event[0] = XE_GSC_HW_HEALTH_UEVENT "=1";
+	csc_hw_error_event[1] = "RESET_REASON=CSC_HW_ERROR";
+	csc_hw_error_event[2] = NULL;
+
+	kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE,
+			   csc_hw_error_event);
+}
+
 static void
 xe_gsc_hw_error_handler(struct xe_tile *tile, const enum hardware_error hw_err)
 {
@@ -435,6 +451,7 @@ 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
 					    "Tile0 reported GSC %s %s error, bit[%d] is set\n",
 					    name, hw_err_str, errbit);
+			schedule_work(&tile->gsc_hw_err_work);
 		}
 		if (indx != XE_HW_ERR_TILE_UNSPEC)
 			xe_update_hw_error_cnt(&tile_to_xe(tile)->drm,
diff --git a/drivers/gpu/drm/xe/xe_hw_error.h b/drivers/gpu/drm/xe/xe_hw_error.h
index 997747b6b603..3c02fbd3b256 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>
 
 #define XE_RAS_REG_SIZE 32
 
@@ -106,5 +107,5 @@ struct xe_tile;
 void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl);
 void xe_assign_hw_err_regs(struct xe_device *xe);
 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 8365a4cb0c45..bc0f01a2abc1 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -614,6 +614,10 @@ 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 24bf8f0f52e8..4e5e57bc9f69 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 pci node.
+ *
+ * XE_GSC_HW_HEALTH_UEVENT - Event is generated when GSC reports HW
+ * errors. The value supplied with the event is always "NEEDS_RESET"
+ * Additional information supplied is "RESET_REASON=CSC_HW_ERROR".
+ */
+#define XE_GSC_HW_HEALTH_UEVENT "DEVICE_STATUS"
+
 /**
  * DOC: uevent generated by xe on it's pci node.
  *
-- 
2.25.1