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Subject[PATCH 2/3] perf: Add support for extra parameters for raw events
Date
From: Andi Kleen <ak@linux.intel.com>

Add support to the perf tool to specify extra values for raw events
and pass them to the kernel.

The new format is -e rXXXX[,YYYY]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/Documentation/perf-list.txt | 6 ++++++
tools/perf/builtin-report.c | 7 ++++---
tools/perf/util/parse-events.c | 26 ++++++++++++++++++++------
tools/perf/util/parse-events.h | 2 +-
tools/perf/util/ui/browsers/hists.c | 3 ++-
5 files changed, 33 insertions(+), 11 deletions(-)
diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 399751b..c398390 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -61,6 +61,12 @@ raw encoding of 0x1A8 can be used:
You should refer to the processor specific documentation for getting these
details. Some of them are referenced in the SEE ALSO section below.

+Some special events like the Intel OFFCORE_RESPONSE events require
+extra parameters. These can be specified by appending a command and
+the extra parameter as a hex number. Since the bitmasks can be
+complicated to compute it is recommended to use a suitable mapping file
+with --event-map.
+
OPTIONS
-------
None
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 5de405d..7f6bcfb 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -187,7 +187,8 @@ static int process_read_event(event_t *event, struct perf_session *session __use
attr = perf_header__find_attr(event->read.id, &session->header);

if (show_threads) {
- const char *name = attr ? __event_name(attr->type, attr->config)
+ const char *name = attr ? __event_name(attr->type, attr->config,
+ 0)
: "unknown";
perf_read_values_add_value(&show_threads_values,
event->read.pid, event->read.tid,
@@ -197,7 +198,7 @@ static int process_read_event(event_t *event, struct perf_session *session __use
}

dump_printf(": %d %d %s %Lu\n", event->read.pid, event->read.tid,
- attr ? __event_name(attr->type, attr->config) : "FAIL",
+ attr ? __event_name(attr->type, attr->config, 0) : "FAIL",
event->read.value);

return 0;
@@ -275,7 +276,7 @@ static int hists__tty_browse_tree(struct rb_root *tree, const char *help)
const char *evname = NULL;

if (rb_first(&hists->entries) != rb_last(&hists->entries))
- evname = __event_name(hists->type, hists->config);
+ evname = __event_name(hists->type, hists->config, 0);

hists__fprintf_nr_sample_events(hists, evname, stdout);
hists__fprintf(hists, NULL, false, stdout);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 2cc7b3d..0fd3b8f 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -279,15 +279,18 @@ const char *event_name(int counter)
u64 config = attrs[counter].config;
int type = attrs[counter].type;

- return __event_name(type, config);
+ return __event_name(type, config, attrs[counter].event_extra);
}

-const char *__event_name(int type, u64 config)
+const char *__event_name(int type, u64 config, u64 extra)
{
- static char buf[32];
+ static char buf[64];
+ int n;

if (type == PERF_TYPE_RAW) {
- sprintf(buf, "raw 0x%llx", config);
+ n = sprintf(buf, "raw 0x%llx", config);
+ if (extra)
+ sprintf(buf + n, ",%#llx", extra);
return buf;
}

@@ -669,9 +672,20 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr)
return EVT_FAILED;
n = hex2u64(str + 1, &config);
if (n > 0) {
- *strp = str + n + 1;
+ str += n + 1;
+ *strp = str;
attr->type = PERF_TYPE_RAW;
attr->config = config;
+
+ if (*str++ == ',') {
+ n = hex2u64(str + 1, &config);
+ if (n > 0) {
+ attr->event_extra = config;
+ str += n + 1;
+ *strp = str;
+ }
+ }
+
return EVT_HANDLED;
}
return EVT_FAILED;
@@ -983,7 +997,7 @@ void print_events(void)

printf("\n");
printf(" %-42s [%s]\n",
- "rNNN (see 'perf list --help' on how to encode it)",
+ "rNNN[,EEE] (see 'perf list --help' on how to encode it)",
event_type_descriptors[PERF_TYPE_RAW]);
printf("\n");

diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 1d6df9c..a4e20ed 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -21,7 +21,7 @@ extern struct perf_event_attr attrs[MAX_COUNTERS];
extern char *filters[MAX_COUNTERS];

extern const char *event_name(int ctr);
-extern const char *__event_name(int type, u64 config);
+extern const char *__event_name(int type, u64 config, u64 extra);

extern int parse_events(const struct option *opt, const char *str, int unset);
extern int parse_filter(const struct option *opt, const char *str, int unset);
diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index ebda8c3..fdbdfe1 100644
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -991,7 +991,8 @@ int hists__tui_browse_tree(struct rb_root *self, const char *help)

while (nd) {
struct hists *hists = rb_entry(nd, struct hists, rb_node);
- const char *ev_name = __event_name(hists->type, hists->config);
+ const char *ev_name = __event_name(hists->type, hists->config,
+ 0);

key = hists__browse(hists, help, ev_name);
switch (key) {
--
1.7.1


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