linux-kernel - [PATCH 1/3] trace, cxl: Introduce a TRACE

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Date:   Tue, 14 Jun 2022 17:10:26 -0700
From:   alison.schofield@...el.com
To:     Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Alison Schofield <alison.schofield@...el.com>,
        linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] trace, cxl: Introduce a TRACE_EVENT for CXL Poison Records

From: Alison Schofield <alison.schofield@...el.com>

Add a trace event for CXL Poison List Media Error Records that
includes the starting DPA of the poison, the length, and the
the source of the poison.

This trace event will be used by the CXL_MEM driver to log the
Media Errors returned by the GET_POISON_LIST Mailbox command.

Signed-off-by: Alison Schofield <alison.schofield@...el.com>
---
 include/trace/events/cxl.h | 60 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 include/trace/events/cxl.h

diff --git a/include/trace/events/cxl.h b/include/trace/events/cxl.h
new file mode 100644
index 000000000000..17e707c3817e
--- /dev/null
+++ b/include/trace/events/cxl.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cxl
+
+#if !defined(_CXL_TRACE_H) ||  defined(TRACE_HEADER_MULTI_READ)
+#define _CXL_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_UNKNOWN);
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_INTERNAL);
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_EXTERNAL);
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_INJECTED);
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_VENDOR);
+TRACE_DEFINE_ENUM(CXL_POISON_SOURCE_INVALID);
+
+#define show_poison_source(source)					\
+	__print_symbolic(source,					\
+			{CXL_POISON_SOURCE_UNKNOWN,  "UNKNOWN"},	\
+			{CXL_POISON_SOURCE_EXTERNAL, "EXTERNAL"},	\
+			{CXL_POISON_SOURCE_INTERNAL, "INTERNAL"},	\
+			{CXL_POISON_SOURCE_INJECTED, "INJECTED"},	\
+			{CXL_POISON_SOURCE_VENDOR,   "VENDOR"},		\
+			{CXL_POISON_SOURCE_INVALID,  "INVALID"})
+
+TRACE_EVENT(cxl_poison_list,
+
+	    TP_PROTO(struct device *dev,
+		     int source,
+		     unsigned long start,
+		     unsigned int length),
+
+	    TP_ARGS(dev, source, start, length),
+
+	    TP_STRUCT__entry(
+		__string(name, dev_name(dev))
+		__field(int, source)
+		__field(u64, start)
+		__field(u32, length)
+	    ),
+
+	    TP_fast_assign(
+		__assign_str(name, dev_name(dev));
+		__entry->source = source;
+		__entry->start = start;
+		__entry->length = length;
+	    ),
+
+	    TP_printk("dev %s source %s start %llu length %u",
+		__get_str(name),
+		show_poison_source(__entry->source),
+		__entry->start,
+		__entry->length)
+);
+#endif /* _CXL_TRACE_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE cxl
+#include <trace/define_trace.h>
-- 
2.31.1