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Subject[PATCH 1/2] perf, tool: Fix hw breakpoint's type modifier parsing
Date
Fixing the hw breakpoint's type modifier parsing to allow all
possible combinations of 'rwx' characters.

Adding automated tests to the parsing test suite.

Original-patch-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
tools/perf/util/parse-events-test.c | 37 +++++++++++++++++++++++++++++++++++
tools/perf/util/parse-events.c | 16 ++++++++++++--
tools/perf/util/parse-events.l | 2 +-
3 files changed, 51 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/parse-events-test.c b/tools/perf/util/parse-events-test.c
index 229af6d..50e6a94 100644
--- a/tools/perf/util/parse-events-test.c
+++ b/tools/perf/util/parse-events-test.c
@@ -181,6 +181,22 @@ static int test__checkevent_breakpoint_w(struct perf_evlist *evlist)
return 0;
}

+static int test__checkevent_breakpoint_rw(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel = list_entry(evlist->entries.next,
+ struct perf_evsel, node);
+
+ TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
+ TEST_ASSERT_VAL("wrong type",
+ PERF_TYPE_BREAKPOINT == evsel->attr.type);
+ TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
+ TEST_ASSERT_VAL("wrong bp_type",
+ (HW_BREAKPOINT_R|HW_BREAKPOINT_W) == evsel->attr.bp_type);
+ TEST_ASSERT_VAL("wrong bp_len",
+ HW_BREAKPOINT_LEN_4 == evsel->attr.bp_len);
+ return 0;
+}
+
static int test__checkevent_tracepoint_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
@@ -352,6 +368,19 @@ static int test__checkevent_breakpoint_w_modifier(struct perf_evlist *evlist)
return test__checkevent_breakpoint_w(evlist);
}

+static int test__checkevent_breakpoint_rw_modifier(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel = list_entry(evlist->entries.next,
+ struct perf_evsel, node);
+
+ TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
+ TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
+ TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
+ TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
+
+ return test__checkevent_breakpoint_rw(evlist);
+}
+
static int test__checkevent_pmu(struct perf_evlist *evlist)
{

@@ -584,6 +613,14 @@ static struct test__event_st test__events[] = {
.name = "instructions:H",
.check = test__checkevent_exclude_guest_modifier,
},
+ [26] = {
+ .name = "mem:0:rw",
+ .check = test__checkevent_breakpoint_rw,
+ },
+ [27] = {
+ .name = "mem:0:rw:kp",
+ .check = test__checkevent_breakpoint_rw_modifier,
+ },
};

#define TEST__EVENTS_CNT (sizeof(test__events) / sizeof(struct test__event_st))
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 0cc27da..7ae76af 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -383,21 +383,31 @@ parse_breakpoint_type(const char *type, struct perf_event_attr *attr)
if (!type || !type[i])
break;

+#define CHECK_SET_TYPE(bit) \
+do { \
+ if (attr->bp_type & bit) \
+ return -EINVAL; \
+ else \
+ attr->bp_type |= bit; \
+} while (0)
+
switch (type[i]) {
case 'r':
- attr->bp_type |= HW_BREAKPOINT_R;
+ CHECK_SET_TYPE(HW_BREAKPOINT_R);
break;
case 'w':
- attr->bp_type |= HW_BREAKPOINT_W;
+ CHECK_SET_TYPE(HW_BREAKPOINT_W);
break;
case 'x':
- attr->bp_type |= HW_BREAKPOINT_X;
+ CHECK_SET_TYPE(HW_BREAKPOINT_X);
break;
default:
return -EINVAL;
}
}

+#undef CHECK_SET_TYPE
+
if (!attr->bp_type) /* Default */
attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 488362e..a066894 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -76,7 +76,7 @@ num_hex 0x[a-fA-F0-9]+
num_raw_hex [a-fA-F0-9]+
name [a-zA-Z_*?][a-zA-Z0-9_*?]*
modifier_event [ukhpGH]{1,8}
-modifier_bp [rwx]
+modifier_bp [rwx]{1,3}

%%

--
1.7.7.6


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