[PATCH v1 4/4] drm/xe/ras: Introduce correctable error handling

[Raag Jadav <raag.jadav@intel.com>]

Add initial support for correctable error handling which is serviced
using system controller event. Currently we only log the errors in
dmesg but this serves as a foundation for RAS infrastructure and will
be further extended to facilitate other RAS features.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
---
 drivers/gpu/drm/xe/Makefile           |  1 +
 drivers/gpu/drm/xe/xe_ras.c           | 86 +++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_ras.h           | 14 +++++
 drivers/gpu/drm/xe/xe_ras_types.h     | 79 ++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_sysctrl_event.c |  3 +-
 5 files changed, 182 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/xe/xe_ras.c
 create mode 100644 drivers/gpu/drm/xe/xe_ras.h
 create mode 100644 drivers/gpu/drm/xe/xe_ras_types.h

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 16e28cab8464..8cc060a64c90 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -110,6 +110,7 @@ xe-y += xe_bb.o \
 	xe_pxp_submit.o \
 	xe_query.o \
 	xe_range_fence.o \
+	xe_ras.o \
 	xe_reg_sr.o \
 	xe_reg_whitelist.o \
 	xe_ring_ops.o \
diff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c
new file mode 100644
index 000000000000..6fea009c991a
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_ras.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#include "xe_assert.h"
+#include "xe_printk.h"
+#include "xe_ras.h"
+#include "xe_ras_types.h"
+#include "xe_sysctrl_event_types.h"
+
+/* Severity of detected errors  */
+enum xe_ras_severity {
+	XE_RAS_SEV_NOT_SUPPORTED		= 0x00,
+	XE_RAS_SEV_CORRECTABLE			= 0x01,
+	XE_RAS_SEV_UNCORRECTABLE		= 0x02,
+	XE_RAS_SEV_INFORMATIONAL		= 0x03,
+	XE_RAS_SEV_MAX
+};
+
+/* Major IP blocks/components where errors can originate */
+enum xe_ras_component {
+	XE_RAS_COMP_NOT_SUPPORTED		= 0x00,
+	XE_RAS_COMP_MEMORY			= 0x01,
+	XE_RAS_COMP_GT				= 0x02,
+	XE_RAS_COMP_RESERVED			= 0x03,
+	XE_RAS_COMP_PCIE			= 0x04,
+	XE_RAS_COMP_FABRIC			= 0x05,
+	XE_RAS_COMP_SOC				= 0x06,
+	XE_RAS_COMP_MAX
+};
+
+static const char *xe_ras_severities[] = {
+	[XE_RAS_SEV_NOT_SUPPORTED]		= "Not Supported",
+	[XE_RAS_SEV_CORRECTABLE]		= "Correctable",
+	[XE_RAS_SEV_UNCORRECTABLE]		= "Uncorrectable",
+	[XE_RAS_SEV_INFORMATIONAL]		= "Informational",
+};
+static_assert(ARRAY_SIZE(xe_ras_severities) == XE_RAS_SEV_MAX);
+
+static const char *xe_ras_components[] = {
+	[XE_RAS_COMP_NOT_SUPPORTED]		= "Not Supported",
+	[XE_RAS_COMP_MEMORY]			= "Memory",
+	[XE_RAS_COMP_GT]			= "GT",
+	[XE_RAS_COMP_RESERVED]			= "Reserved",
+	[XE_RAS_COMP_PCIE]			= "PCIe",
+	[XE_RAS_COMP_FABRIC]			= "Fabric",
+	[XE_RAS_COMP_SOC]			= "SoC",
+};
+static_assert(ARRAY_SIZE(xe_ras_components) == XE_RAS_COMP_MAX);
+
+static inline const char *sev_to_str(struct xe_device *xe, u32 sev)
+{
+	xe_assert(xe, sev < XE_RAS_SEV_MAX);
+
+	return xe_ras_severities[sev];
+}
+
+static inline const char *comp_to_str(struct xe_device *xe, u32 comp)
+{
+	xe_assert(xe, comp < XE_RAS_COMP_MAX);
+
+	return xe_ras_components[comp];
+}
+
+void xe_ras_event_log(struct xe_device *xe, struct xe_sysctrl_event_response *response)
+{
+	struct xe_ras_event_threshold_crossed *pending = (void *)&response->data;
+	struct xe_ras_error *errors = pending->counters;
+	u32 cid, sev, comp, inst, cause;
+	u8 tile;
+
+	xe_assert(xe, pending->ncounters < XE_RAS_NUM_COUNTERS);
+
+	for (cid = 0; cid < pending->ncounters; cid++) {
+		sev = errors[cid].common.severity;
+		comp = errors[cid].common.component;
+
+		tile = errors[cid].product.unit.tile;
+		inst = errors[cid].product.unit.instance;
+		cause = errors[cid].product.cause.cause;
+
+		xe_warn(xe, "[RAS]: Error:%s Tile:%u Component:%s Instance:%u Cause:%#x\n",
+			sev_to_str(xe, sev), tile, comp_to_str(xe, comp), inst, cause);
+	}
+}
diff --git a/drivers/gpu/drm/xe/xe_ras.h b/drivers/gpu/drm/xe/xe_ras.h
new file mode 100644
index 000000000000..fdefe0e2fe98
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_ras.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#ifndef _XE_RAS_H_
+#define _XE_RAS_H_
+
+struct xe_device;
+struct xe_sysctrl_event_response;
+
+void xe_ras_event_log(struct xe_device *xe, struct xe_sysctrl_event_response *response);
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_ras_types.h b/drivers/gpu/drm/xe/xe_ras_types.h
new file mode 100644
index 000000000000..348ba520d676
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_ras_types.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#ifndef _XE_RAS_TYPES_H_
+#define _XE_RAS_TYPES_H_
+
+#include <linux/types.h>
+
+#define XE_RAS_NUM_COUNTERS			21
+
+/**
+ * struct xe_ras_error_common - Error fields that are common across all products
+ */
+struct xe_ras_error_common {
+	/** @severity: Error severity */
+	u8 severity;
+	/** @component: IP block where error originated */
+	u8 component;
+} __packed;
+
+/**
+ * struct xe_ras_error_unit - Error unit information
+ */
+struct xe_ras_error_unit {
+	/** @tile: Tile identifier */
+	u8 tile;
+	/** @instance: Instance identifier specific to IP */
+	u32 instance;
+} __packed;
+
+/**
+ * struct xe_ras_error_cause - Error cause information
+ */
+struct xe_ras_error_cause {
+	/** @cause: Cause/checker */
+	u32 cause;
+	/** @reserved: For future use */
+	u8 reserved;
+} __packed;
+
+/**
+ * struct xe_ras_error_product - Error fields that are specific to the product
+ */
+struct xe_ras_error_product {
+	/** @unit: Unit within IP block */
+	struct xe_ras_error_unit unit;
+	/** @cause: Cause/checker */
+	struct xe_ras_error_cause cause;
+} __packed;
+
+/**
+ * struct xe_ras_error - Combines common and product-specific parts
+ */
+struct xe_ras_error {
+	/** @common: Common error type and component */
+	struct xe_ras_error_common common;
+	/** @product: Product-specific unit and cause */
+	struct xe_ras_error_product product;
+} __packed;
+
+/**
+ * struct xe_ras_event_threshold_crossed - Event data for counter threshold crossed event
+ */
+struct xe_ras_event_threshold_crossed {
+	/** @ncounters: Number of counters that crossed thresholds */
+	u32 ncounters;
+	/** @ts_high: Upper 32 bits of event timestamp */
+	u32 ts_high;
+	/** @ts_low: Lower 32 bits of event timestamp */
+	u32 ts_low;
+	/** @reason: Threshold cross reason */
+	u32 reason;
+	/** @counters: Array of error counters that crossed threshold */
+	struct xe_ras_error counters[XE_RAS_NUM_COUNTERS];
+} __packed;
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_event.c b/drivers/gpu/drm/xe/xe_sysctrl_event.c
index 3a860bc34db0..d70bef72764f 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl_event.c
+++ b/drivers/gpu/drm/xe/xe_sysctrl_event.c
@@ -8,6 +8,7 @@
 #include "xe_irq.h"
 #include "xe_pm.h"
 #include "xe_printk.h"
+#include "xe_ras.h"
 #include "xe_sysctrl.h"
 #include "xe_sysctrl_event_types.h"
 #include "xe_sysctrl_mailbox.h"
@@ -34,7 +35,7 @@ static void xe_sysctrl_get_pending_event(struct xe_device *xe,
 			xe_err(xe, "Unexpected response length %ld\n", len);
 
 		if (response.event == XE_SYSCTRL_EVENT_THRESHOLD_CROSSED)
-			xe_warn(xe, "Counter threshold crossed\n");
+			xe_ras_event_log(xe, &response);
 		else
 			xe_err(xe, "Unexpected event %#x\n", response.event);
 
-- 
2.43.0