[RFC PATCH 03/11] soc: mediatek: dram-ecc: add tracepoints

[santino.wang]

From: Santino Wang <santino.wang at mediatek.com>

Add tracepoints for the driver lifecycle, corrected and uncorrectable
errors, and page retirement, so error handling can be followed with
ftrace without relying on the kernel log.

Signed-off-by: Santino Wang <santino.wang at mediatek.com>
---
 drivers/soc/mediatek/dram-ecc/core/Makefile |   5 +-
 drivers/soc/mediatek/dram-ecc/core/main.c   |   3 +
 drivers/soc/mediatek/dram-ecc/core/trace.c  |   6 +
 drivers/soc/mediatek/dram-ecc/core/trace.h  | 119 ++++++++++++++++++++
 4 files changed, 132 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/mediatek/dram-ecc/core/trace.c
 create mode 100644 drivers/soc/mediatek/dram-ecc/core/trace.h

diff --git a/drivers/soc/mediatek/dram-ecc/core/Makefile b/drivers/soc/mediatek/dram-ecc/core/Makefile
index 429347bfd057..66ce5d306a45 100644
--- a/drivers/soc/mediatek/dram-ecc/core/Makefile
+++ b/drivers/soc/mediatek/dram-ecc/core/Makefile
@@ -4,4 +4,7 @@ obj-$(CONFIG_MTK_DRAM_ECC) += mtk_dram_ecc.o
 
 mtk_dram_ecc-y := \
 	main.o \
-	smc.o
+	smc.o \
+	trace.o
+
+CFLAGS_trace.o := -I$(src)
diff --git a/drivers/soc/mediatek/dram-ecc/core/main.c b/drivers/soc/mediatek/dram-ecc/core/main.c
index 5000d1f3c7e3..ce6bd39fa303 100644
--- a/drivers/soc/mediatek/dram-ecc/core/main.c
+++ b/drivers/soc/mediatek/dram-ecc/core/main.c
@@ -7,6 +7,7 @@
 #include <linux/device/class.h>
 
 #include "mtk_dram_ecc.h"
+#include "trace.h"
 
 static struct class *mtk_dram_ecc_class;
 static struct device *mtk_dram_ecc_dev;
@@ -33,6 +34,7 @@ static int __init mtk_dram_ecc_init(void)
 		goto err_class;
 	}
 
+	trace_mtk_dram_ecc_lifecycle(0);
 	dev_info(mtk_dram_ecc_dev, "initialized\n");
 	return 0;
 
@@ -45,6 +47,7 @@ static void __exit mtk_dram_ecc_exit(void)
 {
 	device_destroy(mtk_dram_ecc_class, MKDEV(0, 0));
 	class_destroy(mtk_dram_ecc_class);
+	trace_mtk_dram_ecc_lifecycle(1);
 }
 
 module_init(mtk_dram_ecc_init);
diff --git a/drivers/soc/mediatek/dram-ecc/core/trace.c b/drivers/soc/mediatek/dram-ecc/core/trace.c
new file mode 100644
index 000000000000..9a8b20e48069
--- /dev/null
+++ b/drivers/soc/mediatek/dram-ecc/core/trace.c
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2026 MediaTek Inc.
+ */
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/drivers/soc/mediatek/dram-ecc/core/trace.h b/drivers/soc/mediatek/dram-ecc/core/trace.h
new file mode 100644
index 000000000000..d603fc38f0a7
--- /dev/null
+++ b/drivers/soc/mediatek/dram-ecc/core/trace.h
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2026 MediaTek Inc.
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mtk_dram_ecc
+
+#if !defined(_TRACE_MTK_DRAM_ECC_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MTK_DRAM_ECC_H
+
+#include <linux/tracepoint.h>
+
+/* driver lifecycle - state: 0=init, 1=exit */
+
+TRACE_EVENT(mtk_dram_ecc_lifecycle,
+	TP_PROTO(int state),
+	TP_ARGS(state),
+	TP_STRUCT__entry(
+		__field(int, state)
+	),
+	TP_fast_assign(
+		__entry->state = state;
+	),
+	TP_printk("%s", __entry->state ? "driver removed" : "driver initialized")
+);
+
+/*
+ * ECC events - spa/channel/subchannel/rank/bank/row/column decoded from the
+ * ECCERR_INFO0/1 entry that determined severity (see ghes_notifier.c),
+ * mirroring ATF dram_ecc/mt8992/fiq.c's decode. No agent/master ID: ATF's
+ * GHES vendor section doesn't compute them (see mtk_dram_ecc_event.h).
+ */
+
+TRACE_EVENT(mtk_dram_ecc_ce,
+	TP_PROTO(u64 spa, u8 channel, u8 subch, u16 rank, u16 bank, u32 row,
+		 u16 column),
+	TP_ARGS(spa, channel, subch, rank, bank, row, column),
+	TP_STRUCT__entry(
+		__field(u64, spa)
+		__field(u8, channel)
+		__field(u8, subch)
+		__field(u16, rank)
+		__field(u16, bank)
+		__field(u32, row)
+		__field(u16, column)
+	),
+	TP_fast_assign(
+		__entry->spa     = spa;
+		__entry->channel = channel;
+		__entry->subch   = subch;
+		__entry->rank    = rank;
+		__entry->bank    = bank;
+		__entry->row     = row;
+		__entry->column  = column;
+	),
+	TP_printk("spa=0x%016llx ch=%u subch=%u rank=%u bank=%u row=%u column=%u",
+		  __entry->spa, __entry->channel, __entry->subch,
+		  __entry->rank, __entry->bank, __entry->row,
+		  __entry->column)
+);
+
+TRACE_EVENT(mtk_dram_ecc_uce,
+	TP_PROTO(u64 spa, u8 channel, u8 subch, u16 rank, u16 bank, u32 row,
+		 u16 column),
+	TP_ARGS(spa, channel, subch, rank, bank, row, column),
+	TP_STRUCT__entry(
+		__field(u64, spa)
+		__field(u8, channel)
+		__field(u8, subch)
+		__field(u16, rank)
+		__field(u16, bank)
+		__field(u32, row)
+		__field(u16, column)
+	),
+	TP_fast_assign(
+		__entry->spa     = spa;
+		__entry->channel = channel;
+		__entry->subch   = subch;
+		__entry->rank    = rank;
+		__entry->bank    = bank;
+		__entry->row     = row;
+		__entry->column  = column;
+	),
+	TP_printk("spa=0x%016llx ch=%u subch=%u rank=%u bank=%u row=%u column=%u",
+		  __entry->spa, __entry->channel, __entry->subch,
+		  __entry->rank, __entry->bank, __entry->row,
+		  __entry->column)
+);
+
+/* page retire */
+
+TRACE_EVENT(mtk_dram_ecc_page_retire,
+	TP_PROTO(u64 pfn, u32 count, u32 threshold, bool retired),
+	TP_ARGS(pfn, count, threshold, retired),
+	TP_STRUCT__entry(
+		__field(u64,  pfn)
+		__field(u32,  count)
+		__field(u32,  threshold)
+		__field(bool, retired)
+	),
+	TP_fast_assign(
+		__entry->pfn       = pfn;
+		__entry->count     = count;
+		__entry->threshold = threshold;
+		__entry->retired   = retired;
+	),
+	TP_printk("pfn=0x%llx count=%u threshold=%u retired=%s",
+		  __entry->pfn, __entry->count, __entry->threshold,
+		  __entry->retired ? "yes" : "no")
+);
+
+#endif /* _TRACE_MTK_DRAM_ECC_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>
-- 
2.45.2