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

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Date:   Thu, 16 Jun 2022 12:45:55 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     "alison.schofield@...el.com" <alison.schofield@...el.com>
Cc:     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>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org, a.manzanares@...sung.com
Subject: Re: [PATCH 1/3] trace, cxl: Introduce a TRACE_EVENT for CXL Poison
 Records

On Tue, 14 Jun 2022, alison.schofield@...el.com wrote:

>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>
>Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Reviewed-by: Davidlohr Bueso <dave@...olabs.net>

>---
> 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
>