perf tools: Add a user event for AUX area tracing errors

Errors encountered when decoding an AUX area trace need to be reported
to the user. However the "user" might be a script or another tool, so
provide a new user event to capture those errors.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1428594864-29309-8-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index adada16..32323e5 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -31,6 +31,7 @@ static const char *perf_event__names[] = {
        [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
        [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
        [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
+       [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
 };
 
 const char *perf_event__name(unsigned int id)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 6d81bec..657dcfa 100644 (file)
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -217,6 +217,7 @@ enum perf_user_event_type { /* above any possible kernel type */
        PERF_RECORD_ID_INDEX                    = 69,
        PERF_RECORD_AUXTRACE_INFO               = 70,
        PERF_RECORD_AUXTRACE                    = 71,
+       PERF_RECORD_AUXTRACE_ERROR              = 72,
        PERF_RECORD_HEADER_MAX
 };
 
@@ -300,6 +301,20 @@ struct auxtrace_event {
        u32 reserved__; /* For alignment */
 };
 
+#define MAX_AUXTRACE_ERROR_MSG 64
+
+struct auxtrace_error_event {
+       struct perf_event_header header;
+       u32 type;
+       u32 code;
+       u32 cpu;
+       u32 pid;
+       u32 tid;
+       u32 reserved__; /* For alignment */
+       u64 ip;
+       char msg[MAX_AUXTRACE_ERROR_MSG];
+};
+
 union perf_event {
        struct perf_event_header        header;
        struct mmap_event               mmap;
@@ -317,6 +332,7 @@ union perf_event {
        struct id_index_event           id_index;
        struct auxtrace_info_event      auxtrace_info;
        struct auxtrace_event           auxtrace;
+       struct auxtrace_error_event     auxtrace_error;
 };
 
 void perf_event__print_totals(void);

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index d46ac40..4008dab 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -296,6 +296,15 @@ static s64 process_event_auxtrace_stub(struct perf_tool *tool __maybe_unused,
        return event->auxtrace.size;
 }
 
+static
+int process_event_auxtrace_error_stub(struct perf_tool *tool __maybe_unused,
+                                     union perf_event *event __maybe_unused,
+                                     struct perf_session *session __maybe_unused)
+{
+       dump_printf(": unhandled!\n");
+       return 0;
+}
+
 void perf_tool__fill_defaults(struct perf_tool *tool)
 {
        if (tool->sample == NULL)
@@ -336,6 +345,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
                tool->auxtrace_info = process_event_auxtrace_info_stub;
        if (tool->auxtrace == NULL)
                tool->auxtrace = process_event_auxtrace_stub;
+       if (tool->auxtrace_error == NULL)
+               tool->auxtrace_error = process_event_auxtrace_error_stub;
 }
 
 static void swap_sample_id_all(union perf_event *event, void *data)
@@ -539,6 +550,17 @@ static void perf_event__auxtrace_swap(union perf_event *event,
        event->auxtrace.cpu       = bswap_32(event->auxtrace.cpu);
 }
 
+static void perf_event__auxtrace_error_swap(union perf_event *event,
+                                           bool sample_id_all __maybe_unused)
+{
+       event->auxtrace_error.type = bswap_32(event->auxtrace_error.type);
+       event->auxtrace_error.code = bswap_32(event->auxtrace_error.code);
+       event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
+       event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
+       event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
+       event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
+}
+
 typedef void (*perf_event__swap_op)(union perf_event *event,
                                    bool sample_id_all);
 
@@ -560,6 +582,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
        [PERF_RECORD_ID_INDEX]            = perf_event__all64_swap,
        [PERF_RECORD_AUXTRACE_INFO]       = perf_event__auxtrace_info_swap,
        [PERF_RECORD_AUXTRACE]            = perf_event__auxtrace_swap,
+       [PERF_RECORD_AUXTRACE_ERROR]      = perf_event__auxtrace_error_swap,
        [PERF_RECORD_HEADER_MAX]          = NULL,
 };
 
@@ -1049,6 +1072,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
                /* setup for reading amidst mmap */
                lseek(fd, file_offset + event->header.size, SEEK_SET);
                return tool->auxtrace(tool, event, session);
+       case PERF_RECORD_AUXTRACE_ERROR:
+               return tool->auxtrace_error(tool, event, session);
        default:
                return -EINVAL;
        }

diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 0146f8e..20afe19 100644 (file)
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -50,7 +50,8 @@ struct perf_tool {
        event_oe        finished_round;
        event_op2       build_id,
                        id_index,
-                       auxtrace_info;
+                       auxtrace_info,
+                       auxtrace_error;
        event_op3       auxtrace;
        bool            ordered_events;
        bool            ordering_requires_timestamps;