[PATCH v4 11/17] ras: AEST: Add error count tracking and debugfs interface

[Ruidong Tian]

This commit introduces error counting functionality for AEST records.
Previously, error statistics were not directly available for individual
error records or AEST nodes.

Signed-off-by: Ruidong Tian <tianruidong at linux.alibaba.com>
---
 Documentation/ABI/testing/debugfs-aest | 14 ++++++
 drivers/ras/aest/aest-core.c           | 21 +++++++++
 drivers/ras/aest/aest-sysfs.c          | 64 ++++++++++++++++++++++++++
 drivers/ras/aest/aest.h                | 10 ++++
 4 files changed, 109 insertions(+)

diff --git a/Documentation/ABI/testing/debugfs-aest b/Documentation/ABI/testing/debugfs-aest
index 1152fc83c3fc..a984fcedede2 100644
--- a/Documentation/ABI/testing/debugfs-aest
+++ b/Documentation/ABI/testing/debugfs-aest
@@ -23,9 +23,23 @@ Description:
 		See more at:
 			https://developer.arm.com/documentation/den0085/latest/
 
+What:		/sys/kernel/debug/aest/<name>.<id>/<node_name>/err_count
+Date:		Dec 2025
+KernelVersion	6.19
+Contact:	Ruidong Tian <tianruidong at linux.alibaba.com>
+Description:
+		(RO) Outputs error statistics for all error records of this node.
+
 What:		/sys/kernel/debug/aest/<name>.<id>/<node_name>/record<index>/err_*
 Date:		Dec 2025
 KernelVersion	6.19
 Contact:	Ruidong Tian <tianruidong at linux.alibaba.com>
 Description:
 		(RO) Read err_* register and return val.
+
+What:		/sys/kernel/debug/aest/<name>.<id>/<node_name>/record<index>/err_count
+Date:		Dec 2025
+KernelVersion	6.19
+Contact:	Ruidong Tian <tianruidong at linux.alibaba.com>
+Description:
+		(RO) Outputs error statistics for all this records.
diff --git a/drivers/ras/aest/aest-core.c b/drivers/ras/aest/aest-core.c
index 3bcc635cf8e4..75cca98024ad 100644
--- a/drivers/ras/aest/aest-core.c
+++ b/drivers/ras/aest/aest-core.c
@@ -170,6 +170,27 @@ static int aest_node_gen_pool_add(struct aest_device *adev,
 	init_aest_event(event, record, regs);
 	llist_add(&event->llnode, &adev->event_list);
 
+	if (regs->err_status & ERR_STATUS_CE)
+		record->count.ce++;
+	if (regs->err_status & ERR_STATUS_DE)
+		record->count.de++;
+	if (regs->err_status & ERR_STATUS_UE) {
+		switch (regs->err_status & ERR_STATUS_UET) {
+		case ERR_STATUS_UET_UC:
+			record->count.uc++;
+			break;
+		case ERR_STATUS_UET_UEU:
+			record->count.ueu++;
+			break;
+		case ERR_STATUS_UET_UER:
+			record->count.uer++;
+			break;
+		case ERR_STATUS_UET_UEO:
+			record->count.ueo++;
+			break;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/ras/aest/aest-sysfs.c b/drivers/ras/aest/aest-sysfs.c
index f3b5427ff4f0..b54e879506aa 100644
--- a/drivers/ras/aest/aest-sysfs.c
+++ b/drivers/ras/aest/aest-sysfs.c
@@ -7,6 +7,46 @@
 
 #include "aest.h"
 
+static void
+aest_error_count(struct aest_record *record, void *data)
+{
+	struct record_count *count = data;
+
+	count->ce += record->count.ce;
+	count->de += record->count.de;
+	count->uc += record->count.uc;
+	count->ueu += record->count.ueu;
+	count->uer += record->count.uer;
+	count->ueo += record->count.ueo;
+}
+
+/*******************************************************************************
+ *
+ * Debugfs for AEST node
+ *
+ ******************************************************************************/
+
+static int aest_node_err_count_show(struct seq_file *m, void *data)
+{
+	struct aest_node *node = m->private;
+	struct record_count count = { 0 };
+	int i;
+
+	for (i = 0; i < node->record_count; i++)
+		aest_error_count(&node->records[i], &count);
+
+	seq_printf(m, "CE: %llu\n"
+				"DE: %llu\n"
+				"UC: %llu\n"
+				"UEU: %llu\n"
+				"UEO: %llu\n"
+				"UER: %llu\n",
+				count.ce, count.de, count.uc, count.ueu,
+				count.uer, count.ueo);
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(aest_node_err_count);
+
 /*******************************************************************************
  *
  * Attribute for AEST record
@@ -37,6 +77,25 @@ DEFINE_AEST_DEBUGFS_ATTR(err_misc1, ERXMISC1);
 DEFINE_AEST_DEBUGFS_ATTR(err_misc2, ERXMISC2);
 DEFINE_AEST_DEBUGFS_ATTR(err_misc3, ERXMISC3);
 
+static int aest_record_err_count_show(struct seq_file *m, void *data)
+{
+	struct aest_record *record = m->private;
+	struct record_count count = { 0 };
+
+	aest_error_count(record, &count);
+
+	seq_printf(m, "CE: %llu\n"
+				"DE: %llu\n"
+				"UC: %llu\n"
+				"UEU: %llu\n"
+				"UEO: %llu\n"
+				"UER: %llu\n",
+				count.ce, count.de, count.uc, count.ueu,
+				count.uer, count.ueo);
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(aest_record_err_count);
+
 static void aest_record_init_debugfs(struct aest_record *record)
 {
 	debugfs_create_file("err_fr", 0600, record->debugfs, record,
@@ -55,6 +114,8 @@ static void aest_record_init_debugfs(struct aest_record *record)
 								&err_misc2_ops);
 	debugfs_create_file("err_misc3", 0600, record->debugfs, record,
 								&err_misc3_ops);
+	debugfs_create_file("err_count", 0400, record->debugfs, record,
+						&aest_record_err_count_fops);
 }
 
 static void
@@ -63,6 +124,9 @@ aest_node_init_debugfs(struct aest_node *node)
 	int i;
 	struct aest_record *record;
 
+	debugfs_create_file("err_count", 0400, node->debugfs, node,
+					&aest_node_err_count_fops);
+
 	for (i = 0; i < node->record_count; i++) {
 		record = &node->records[i];
 		if (!record->name)
diff --git a/drivers/ras/aest/aest.h b/drivers/ras/aest/aest.h
index ceb9e32bcee3..802430857dc4 100644
--- a/drivers/ras/aest/aest.h
+++ b/drivers/ras/aest/aest.h
@@ -116,6 +116,15 @@ struct ce_threshold {
 	u64 reg_val;
 };
 
+struct record_count {
+	u64 ce;
+	u64 de;
+	u64 uc;
+	u64 uer;
+	u64 ueo;
+	u64 ueu;
+};
+
 struct aest_record {
 	char *name;
 	int index;
@@ -136,6 +145,7 @@ struct aest_record {
 
 	struct ce_threshold ce;
 	enum ras_ce_threshold threshold_type;
+	struct record_count count;
 	struct dentry *debugfs;
 };
 
-- 
2.51.2.612.gdc70283dfc