2022-06-06 12:03:45

by Yicong Yang

Subject: [PATCH v9 4/8] perf tool: arm: Refactor event list iteration in auxtrace_record__init()

From: Qi Liu <[email protected]>

Add find_pmu_for_event() and use to simplify logic in
auxtrace_record_init(). find_pmu_for_event() will be
reused in subsequent patches.

Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Qi Liu <[email protected]>
Signed-off-by: Yicong Yang <[email protected]>
---
tools/perf/arch/arm/util/auxtrace.c | 53 ++++++++++++++++++-----------
1 file changed, 34 insertions(+), 19 deletions(-)

diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
index 5fc6a2a3dbc5..384c7cfda0fd 100644
--- a/tools/perf/arch/arm/util/auxtrace.c
+++ b/tools/perf/arch/arm/util/auxtrace.c
@@ -50,16 +50,32 @@ static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
return arm_spe_pmus;
}

+static struct perf_pmu *find_pmu_for_event(struct perf_pmu **pmus,
+ int pmu_nr, struct evsel *evsel)
+{
+ int i;
+
+ if (!pmus)
+ return NULL;
+
+ for (i = 0; i < pmu_nr; i++) {
+ if (evsel->core.attr.type == pmus[i]->type)
+ return pmus[i];
+ }
+
+ return NULL;
+}
+
struct auxtrace_record
*auxtrace_record__init(struct evlist *evlist, int *err)
{
- struct perf_pmu *cs_etm_pmu;
+ struct perf_pmu *cs_etm_pmu = NULL;
+ struct perf_pmu **arm_spe_pmus = NULL;
struct evsel *evsel;
- bool found_etm = false;
+ struct perf_pmu *found_etm = NULL;
struct perf_pmu *found_spe = NULL;
- struct perf_pmu **arm_spe_pmus = NULL;
+ int auxtrace_event_cnt = 0;
int nr_spes = 0;
- int i = 0;

if (!evlist)
return NULL;
@@ -68,24 +84,23 @@ struct auxtrace_record
arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);

evlist__for_each_entry(evlist, evsel) {
- if (cs_etm_pmu &&
- evsel->core.attr.type == cs_etm_pmu->type)
- found_etm = true;
-
- if (!nr_spes || found_spe)
- continue;
-
- for (i = 0; i < nr_spes; i++) {
- if (evsel->core.attr.type == arm_spe_pmus[i]->type) {
- found_spe = arm_spe_pmus[i];
- break;
- }
- }
+ if (cs_etm_pmu && !found_etm)
+ found_etm = find_pmu_for_event(&cs_etm_pmu, 1, evsel);
+
+ if (arm_spe_pmus && !found_spe)
+ found_spe = find_pmu_for_event(arm_spe_pmus, nr_spes, evsel);
}
+
free(arm_spe_pmus);

- if (found_etm && found_spe) {
- pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");
+ if (found_etm)
+ auxtrace_event_cnt++;
+
+ if (found_spe)
+ auxtrace_event_cnt++;
+
+ if (auxtrace_event_cnt > 1) {
+ pr_err("Concurrent AUX trace operation not currently supported\n");
*err = -EOPNOTSUPP;
return NULL;
}
--
2.24.0

2022-06-27 01:27:42

by Leo Yan

Subject: Re: [PATCH v9 4/8] perf tool: arm: Refactor event list iteration in auxtrace_record__init()

On Mon, Jun 06, 2022 at 07:55:51PM +0800, Yicong Yang wrote:
> From: Qi Liu <[email protected]>
>
> Add find_pmu_for_event() and use to simplify logic in
> auxtrace_record_init(). find_pmu_for_event() will be
> reused in subsequent patches.
>
> Reviewed-by: Jonathan Cameron <[email protected]>
> Signed-off-by: Qi Liu <[email protected]>
> Signed-off-by: Yicong Yang <[email protected]>

Reviewed-by: Leo Yan <[email protected]>

> ---
> tools/perf/arch/arm/util/auxtrace.c | 53 ++++++++++++++++++-----------
> 1 file changed, 34 insertions(+), 19 deletions(-)
>
> diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
> index 5fc6a2a3dbc5..384c7cfda0fd 100644
> --- a/tools/perf/arch/arm/util/auxtrace.c
> +++ b/tools/perf/arch/arm/util/auxtrace.c
> @@ -50,16 +50,32 @@ static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
> return arm_spe_pmus;
> }
>
> +static struct perf_pmu *find_pmu_for_event(struct perf_pmu **pmus,
> + int pmu_nr, struct evsel *evsel)
> +{
> + int i;
> +
> + if (!pmus)
> + return NULL;
> +
> + for (i = 0; i < pmu_nr; i++) {
> + if (evsel->core.attr.type == pmus[i]->type)
> + return pmus[i];
> + }
> +
> + return NULL;
> +}
> +
> struct auxtrace_record
> *auxtrace_record__init(struct evlist *evlist, int *err)
> {
> - struct perf_pmu *cs_etm_pmu;
> + struct perf_pmu *cs_etm_pmu = NULL;
> + struct perf_pmu **arm_spe_pmus = NULL;
> struct evsel *evsel;
> - bool found_etm = false;
> + struct perf_pmu *found_etm = NULL;
> struct perf_pmu *found_spe = NULL;
> - struct perf_pmu **arm_spe_pmus = NULL;
> + int auxtrace_event_cnt = 0;
> int nr_spes = 0;
> - int i = 0;
>
> if (!evlist)
> return NULL;
> @@ -68,24 +84,23 @@ struct auxtrace_record
> arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
>
> evlist__for_each_entry(evlist, evsel) {
> - if (cs_etm_pmu &&
> - evsel->core.attr.type == cs_etm_pmu->type)
> - found_etm = true;
> -
> - if (!nr_spes || found_spe)
> - continue;
> -
> - for (i = 0; i < nr_spes; i++) {
> - if (evsel->core.attr.type == arm_spe_pmus[i]->type) {
> - found_spe = arm_spe_pmus[i];
> - break;
> - }
> - }
> + if (cs_etm_pmu && !found_etm)
> + found_etm = find_pmu_for_event(&cs_etm_pmu, 1, evsel);
> +
> + if (arm_spe_pmus && !found_spe)
> + found_spe = find_pmu_for_event(arm_spe_pmus, nr_spes, evsel);
> }
> +
> free(arm_spe_pmus);
>
> - if (found_etm && found_spe) {
> - pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");
> + if (found_etm)
> + auxtrace_event_cnt++;
> +
> + if (found_spe)
> + auxtrace_event_cnt++;
> +
> + if (auxtrace_event_cnt > 1) {
> + pr_err("Concurrent AUX trace operation not currently supported\n");
> *err = -EOPNOTSUPP;
> return NULL;
> }
> --
> 2.24.0