linux-kernel - Re: [PATCH 1/2] perf, tool: Fix hw breakpoint's type modifier parsing

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Date:	Fri, 29 Jun 2012 09:40:47 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	bookjovi@...il.com, acme@...stprotocols.net,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf, tool: Fix hw breakpoint's type modifier parsing

On Thu, 28 Jun 2012 23:18:48 +0200, Jiri Olsa wrote:
> Fixing the hw breakpoint's type modifier parsing to allow all
> possible combinations of 'rwx' characters.
>
> Adding automated tests to the parsing test suite.
>

You might need this too:

  Reported-by: Zovi Zhang <bookzovi@...il.com>

Thanks,
Namhyung


> Original-patch-by: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...hat.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}
>  
>  %%
--
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