[PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[Athira Rajeev]

"Tool PMU" tests fails on powerpc as below:

   12.1: Parsing without PMU name:
   --- start ---
   test child forked, pid 48492
   Using CPUID 0x00800200
   Attempt to add: tool/duration_time/
   ..after resolving event: tool/config=0x1/
   duration_time -> tool/duration_time/
   Attempt to add: tool/user_time/
   ..after resolving event: tool/config=0x2/
   user_time -> tool/user_time/
   Attempt to add: tool/system_time/
   ..after resolving event: tool/config=0x3/
   system_time -> tool/system_time/
   Attempt to add: tool/has_pmem/
   ..after resolving event: tool/config=0x4/
   has_pmem -> tool/has_pmem/
   Attempt to add: tool/num_cores/
   ..after resolving event: tool/config=0x5/
   num_cores -> tool/num_cores/
   Attempt to add: tool/num_cpus/
   ..after resolving event: tool/config=0x6/
   num_cpus -> tool/num_cpus/
   Attempt to add: tool/num_cpus_online/
   ..after resolving event: tool/config=0x7/
   num_cpus_online -> tool/num_cpus_online/
   Attempt to add: tool/num_dies/
   ..after resolving event: tool/config=0x8/
   num_dies -> tool/num_dies/
   Attempt to add: tool/num_packages/
   ..after resolving event: tool/config=0x9/
   num_packages -> tool/num_packages/

   ---- unexpected signal (11) ----
   12.1: Parsing without PMU name                                      : FAILED!

Same fail is observed for "Parsing with PMU name" as well.

The testcase loops through events in tool_pmu__for_each_event()
and access event name using "tool_pmu__event_to_str()".
Here tool_pmu__event_to_str returns null for "slots" event
and "system_tsc_freq" event. These two events are only applicable
for arm64 and x86 respectively. So the function tool_pmu__event_to_str()
skips for unsupported events and returns null. This null value is
causing testcase fail.

To address this in "Tool PMU" testcase, add a helper function
tool_pmu__all_event_to_str() which returns the name for all
events mapping to the tool_pmu_event index including the
skipped ones. So that even if its a skipped event, the
helper function helps to resolve the tool_pmu_event index to
its mapping event name. Update the testcase to check for null event
names before proceeding the test.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
 tools/perf/tests/tool_pmu.c | 12 ++++++++++++
 tools/perf/util/tool_pmu.c  | 17 +++++++++++++++++
 tools/perf/util/tool_pmu.h  |  1 +
 3 files changed, 30 insertions(+)

diff --git a/tools/perf/tests/tool_pmu.c b/tools/perf/tests/tool_pmu.c
index 187942b749b7..e468e5fb3c73 100644
--- a/tools/perf/tests/tool_pmu.c
+++ b/tools/perf/tests/tool_pmu.c
@@ -19,6 +19,18 @@ static int do_test(enum tool_pmu_event ev, bool with_pmu)
 		return TEST_FAIL;
 	}
 
+	/*
+	 * if tool_pmu__event_to_str returns NULL, Check if the event is
+	 * valid for the platform.
+	 * Example:
+	 * slots event is only on arm64.
+	 * system_tsc_freq event is only on x86.
+	 */
+	if (!tool_pmu__event_to_str(ev) && tool_pmu__skip_event(tool_pmu__all_event_to_str(ev))) {
+		ret = TEST_OK;
+		goto out;
+	}
+
 	if (with_pmu)
 		snprintf(str, sizeof(str), "tool/%s/", tool_pmu__event_to_str(ev));
 	else
diff --git a/tools/perf/util/tool_pmu.c b/tools/perf/util/tool_pmu.c
index 3a68debe7143..572422797f6e 100644
--- a/tools/perf/util/tool_pmu.c
+++ b/tools/perf/util/tool_pmu.c
@@ -60,6 +60,15 @@ int tool_pmu__num_skip_events(void)
 	return num;
 }
 
+/*
+ * tool_pmu__event_to_str returns only supported event names.
+ * For events which are supposed to be skipped in the platform,
+ * return NULL
+ *
+ * tool_pmu__all_event_to_str returns the name for all
+ * events mapping to the tool_pmu_event index including the
+ * skipped ones.
+ */
 const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
 {
 	if ((ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX) &&
@@ -69,6 +78,14 @@ const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
 	return NULL;
 }
 
+const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev)
+{
+	if (ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX)
+		return tool_pmu__event_names[ev];
+
+	return NULL;
+}
+
 enum tool_pmu_event tool_pmu__str_to_event(const char *str)
 {
 	int i;
diff --git a/tools/perf/util/tool_pmu.h b/tools/perf/util/tool_pmu.h
index a60184859080..da76808ae71e 100644
--- a/tools/perf/util/tool_pmu.h
+++ b/tools/perf/util/tool_pmu.h
@@ -30,6 +30,7 @@ enum tool_pmu_event {
 	for ((ev) = TOOL_PMU__EVENT_DURATION_TIME; (ev) < TOOL_PMU__EVENT_MAX; ev++)
 
 const char *tool_pmu__event_to_str(enum tool_pmu_event ev);
+const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev);
 enum tool_pmu_event tool_pmu__str_to_event(const char *str);
 bool tool_pmu__skip_event(const char *name);
 int tool_pmu__num_skip_events(void);
-- 
2.43.5

Re: [PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[Namhyung Kim]

On Thu, Feb 13, 2025 at 12:24:38AM +0530, Athira Rajeev wrote:
> "Tool PMU" tests fails on powerpc as below:
> 
>    12.1: Parsing without PMU name:
>    --- start ---
>    test child forked, pid 48492
>    Using CPUID 0x00800200
>    Attempt to add: tool/duration_time/
>    ..after resolving event: tool/config=0x1/
>    duration_time -> tool/duration_time/
>    Attempt to add: tool/user_time/
>    ..after resolving event: tool/config=0x2/
>    user_time -> tool/user_time/
>    Attempt to add: tool/system_time/
>    ..after resolving event: tool/config=0x3/
>    system_time -> tool/system_time/
>    Attempt to add: tool/has_pmem/
>    ..after resolving event: tool/config=0x4/
>    has_pmem -> tool/has_pmem/
>    Attempt to add: tool/num_cores/
>    ..after resolving event: tool/config=0x5/
>    num_cores -> tool/num_cores/
>    Attempt to add: tool/num_cpus/
>    ..after resolving event: tool/config=0x6/
>    num_cpus -> tool/num_cpus/
>    Attempt to add: tool/num_cpus_online/
>    ..after resolving event: tool/config=0x7/
>    num_cpus_online -> tool/num_cpus_online/
>    Attempt to add: tool/num_dies/
>    ..after resolving event: tool/config=0x8/
>    num_dies -> tool/num_dies/
>    Attempt to add: tool/num_packages/
>    ..after resolving event: tool/config=0x9/
>    num_packages -> tool/num_packages/
> 
>    ---- unexpected signal (11) ----
>    12.1: Parsing without PMU name                                      : FAILED!
> 
> Same fail is observed for "Parsing with PMU name" as well.
> 
> The testcase loops through events in tool_pmu__for_each_event()
> and access event name using "tool_pmu__event_to_str()".
> Here tool_pmu__event_to_str returns null for "slots" event
> and "system_tsc_freq" event. These two events are only applicable
> for arm64 and x86 respectively. So the function tool_pmu__event_to_str()
> skips for unsupported events and returns null. This null value is
> causing testcase fail.
> 
> To address this in "Tool PMU" testcase, add a helper function
> tool_pmu__all_event_to_str() which returns the name for all
> events mapping to the tool_pmu_event index including the
> skipped ones. So that even if its a skipped event, the
> helper function helps to resolve the tool_pmu_event index to
> its mapping event name. Update the testcase to check for null event
> names before proceeding the test.
> 
> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>

Please take a look at:
https://lore.kernel.org/r/20250212163859.1489916-1-james.clark@linaro.org

Thanks,
Namhyung

> ---
>  tools/perf/tests/tool_pmu.c | 12 ++++++++++++
>  tools/perf/util/tool_pmu.c  | 17 +++++++++++++++++
>  tools/perf/util/tool_pmu.h  |  1 +
>  3 files changed, 30 insertions(+)
> 
> diff --git a/tools/perf/tests/tool_pmu.c b/tools/perf/tests/tool_pmu.c
> index 187942b749b7..e468e5fb3c73 100644
> --- a/tools/perf/tests/tool_pmu.c
> +++ b/tools/perf/tests/tool_pmu.c
> @@ -19,6 +19,18 @@ static int do_test(enum tool_pmu_event ev, bool with_pmu)
>  		return TEST_FAIL;
>  	}
>  
> +	/*
> +	 * if tool_pmu__event_to_str returns NULL, Check if the event is
> +	 * valid for the platform.
> +	 * Example:
> +	 * slots event is only on arm64.
> +	 * system_tsc_freq event is only on x86.
> +	 */
> +	if (!tool_pmu__event_to_str(ev) && tool_pmu__skip_event(tool_pmu__all_event_to_str(ev))) {
> +		ret = TEST_OK;
> +		goto out;
> +	}
> +
>  	if (with_pmu)
>  		snprintf(str, sizeof(str), "tool/%s/", tool_pmu__event_to_str(ev));
>  	else
> diff --git a/tools/perf/util/tool_pmu.c b/tools/perf/util/tool_pmu.c
> index 3a68debe7143..572422797f6e 100644
> --- a/tools/perf/util/tool_pmu.c
> +++ b/tools/perf/util/tool_pmu.c
> @@ -60,6 +60,15 @@ int tool_pmu__num_skip_events(void)
>  	return num;
>  }
>  
> +/*
> + * tool_pmu__event_to_str returns only supported event names.
> + * For events which are supposed to be skipped in the platform,
> + * return NULL
> + *
> + * tool_pmu__all_event_to_str returns the name for all
> + * events mapping to the tool_pmu_event index including the
> + * skipped ones.
> + */
>  const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>  {
>  	if ((ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX) &&
> @@ -69,6 +78,14 @@ const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>  	return NULL;
>  }
>  
> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev)
> +{
> +	if (ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX)
> +		return tool_pmu__event_names[ev];
> +
> +	return NULL;
> +}
> +
>  enum tool_pmu_event tool_pmu__str_to_event(const char *str)
>  {
>  	int i;
> diff --git a/tools/perf/util/tool_pmu.h b/tools/perf/util/tool_pmu.h
> index a60184859080..da76808ae71e 100644
> --- a/tools/perf/util/tool_pmu.h
> +++ b/tools/perf/util/tool_pmu.h
> @@ -30,6 +30,7 @@ enum tool_pmu_event {
>  	for ((ev) = TOOL_PMU__EVENT_DURATION_TIME; (ev) < TOOL_PMU__EVENT_MAX; ev++)
>  
>  const char *tool_pmu__event_to_str(enum tool_pmu_event ev);
> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev);
>  enum tool_pmu_event tool_pmu__str_to_event(const char *str);
>  bool tool_pmu__skip_event(const char *name);
>  int tool_pmu__num_skip_events(void);
> -- 
> 2.43.5
> 

Re: [PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[Thomas Richter]

On 2/12/25 19:54, Athira Rajeev wrote:
> "Tool PMU" tests fails on powerpc as below:
> 
>    12.1: Parsing without PMU name:
>    --- start ---
>    test child forked, pid 48492
>    Using CPUID 0x00800200
>    Attempt to add: tool/duration_time/
>    ..after resolving event: tool/config=0x1/
>    duration_time -> tool/duration_time/
>    Attempt to add: tool/user_time/
>    ..after resolving event: tool/config=0x2/
>    user_time -> tool/user_time/
>    Attempt to add: tool/system_time/
>    ..after resolving event: tool/config=0x3/
>    system_time -> tool/system_time/
>    Attempt to add: tool/has_pmem/
>    ..after resolving event: tool/config=0x4/
>    has_pmem -> tool/has_pmem/
>    Attempt to add: tool/num_cores/
>    ..after resolving event: tool/config=0x5/
>    num_cores -> tool/num_cores/
>    Attempt to add: tool/num_cpus/
>    ..after resolving event: tool/config=0x6/
>    num_cpus -> tool/num_cpus/
>    Attempt to add: tool/num_cpus_online/
>    ..after resolving event: tool/config=0x7/
>    num_cpus_online -> tool/num_cpus_online/
>    Attempt to add: tool/num_dies/
>    ..after resolving event: tool/config=0x8/
>    num_dies -> tool/num_dies/
>    Attempt to add: tool/num_packages/
>    ..after resolving event: tool/config=0x9/
>    num_packages -> tool/num_packages/
> 
>    ---- unexpected signal (11) ----
>    12.1: Parsing without PMU name                                      : FAILED!
> 
> Same fail is observed for "Parsing with PMU name" as well.
> 
> The testcase loops through events in tool_pmu__for_each_event()
> and access event name using "tool_pmu__event_to_str()".
> Here tool_pmu__event_to_str returns null for "slots" event
> and "system_tsc_freq" event. These two events are only applicable
> for arm64 and x86 respectively. So the function tool_pmu__event_to_str()
> skips for unsupported events and returns null. This null value is
> causing testcase fail.
> 
> To address this in "Tool PMU" testcase, add a helper function
> tool_pmu__all_event_to_str() which returns the name for all
> events mapping to the tool_pmu_event index including the
> skipped ones. So that even if its a skipped event, the
> helper function helps to resolve the tool_pmu_event index to
> its mapping event name. Update the testcase to check for null event
> names before proceeding the test.
> 
> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>

for s390:
Tested-by: Thomas Richter <tmricht@linux.ibm.com>

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH

Vorsitzender des Aufsichtsrats: Wolfgang Wendt

Geschäftsführung: David Faller

Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294

Re: [PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[Athira Rajeev]

[-- Attachment #1: Type: text/plain, Size: 5870 bytes --]



> On 13 Feb 2025, at 9:04 AM, Namhyung Kim <namhyung@kernel.org> wrote:
> 
> On Thu, Feb 13, 2025 at 12:24:38AM +0530, Athira Rajeev wrote:
>> "Tool PMU" tests fails on powerpc as below:
>> 
>>   12.1: Parsing without PMU name:
>>   --- start ---
>>   test child forked, pid 48492
>>   Using CPUID 0x00800200
>>   Attempt to add: tool/duration_time/
>>   ..after resolving event: tool/config=0x1/
>>   duration_time -> tool/duration_time/
>>   Attempt to add: tool/user_time/
>>   ..after resolving event: tool/config=0x2/
>>   user_time -> tool/user_time/
>>   Attempt to add: tool/system_time/
>>   ..after resolving event: tool/config=0x3/
>>   system_time -> tool/system_time/
>>   Attempt to add: tool/has_pmem/
>>   ..after resolving event: tool/config=0x4/
>>   has_pmem -> tool/has_pmem/
>>   Attempt to add: tool/num_cores/
>>   ..after resolving event: tool/config=0x5/
>>   num_cores -> tool/num_cores/
>>   Attempt to add: tool/num_cpus/
>>   ..after resolving event: tool/config=0x6/
>>   num_cpus -> tool/num_cpus/
>>   Attempt to add: tool/num_cpus_online/
>>   ..after resolving event: tool/config=0x7/
>>   num_cpus_online -> tool/num_cpus_online/
>>   Attempt to add: tool/num_dies/
>>   ..after resolving event: tool/config=0x8/
>>   num_dies -> tool/num_dies/
>>   Attempt to add: tool/num_packages/
>>   ..after resolving event: tool/config=0x9/
>>   num_packages -> tool/num_packages/
>> 
>>   ---- unexpected signal (11) ----
>>   12.1: Parsing without PMU name                                      : FAILED!
>> 
>> Same fail is observed for "Parsing with PMU name" as well.
>> 
>> The testcase loops through events in tool_pmu__for_each_event()
>> and access event name using "tool_pmu__event_to_str()".
>> Here tool_pmu__event_to_str returns null for "slots" event
>> and "system_tsc_freq" event. These two events are only applicable
>> for arm64 and x86 respectively. So the function tool_pmu__event_to_str()
>> skips for unsupported events and returns null. This null value is
>> causing testcase fail.
>> 
>> To address this in "Tool PMU" testcase, add a helper function
>> tool_pmu__all_event_to_str() which returns the name for all
>> events mapping to the tool_pmu_event index including the
>> skipped ones. So that even if its a skipped event, the
>> helper function helps to resolve the tool_pmu_event index to
>> its mapping event name. Update the testcase to check for null event
>> names before proceeding the test.
>> 
>> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
> 
> Please take a look at:
> https://lore.kernel.org/r/20250212163859.1489916-1-james.clark@linaro.org
> 
> Thanks,
> Namhyung
Hi,

Sure thanks for the fix James

Thomas,
Thanks for testing this patch.  But James already fixed this with a different patch and it is part of perf-tools-next
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/commit/?h=perf-tools-next&id=615ec00b06f78912c370b372426190768402a5b9

Please test with latest perf-tools-next 

Thanks
Athira

> 
>> ---
>> tools/perf/tests/tool_pmu.c | 12 ++++++++++++
>> tools/perf/util/tool_pmu.c  | 17 +++++++++++++++++
>> tools/perf/util/tool_pmu.h  |  1 +
>> 3 files changed, 30 insertions(+)
>> 
>> diff --git a/tools/perf/tests/tool_pmu.c b/tools/perf/tests/tool_pmu.c
>> index 187942b749b7..e468e5fb3c73 100644
>> --- a/tools/perf/tests/tool_pmu.c
>> +++ b/tools/perf/tests/tool_pmu.c
>> @@ -19,6 +19,18 @@ static int do_test(enum tool_pmu_event ev, bool with_pmu)
>> 		return TEST_FAIL;
>> 	}
>> 
>> +	/*
>> +	 * if tool_pmu__event_to_str returns NULL, Check if the event is
>> +	 * valid for the platform.
>> +	 * Example:
>> +	 * slots event is only on arm64.
>> +	 * system_tsc_freq event is only on x86.
>> +	 */
>> +	if (!tool_pmu__event_to_str(ev) && tool_pmu__skip_event(tool_pmu__all_event_to_str(ev))) {
>> +		ret = TEST_OK;
>> +		goto out;
>> +	}
>> +
>> 	if (with_pmu)
>> 		snprintf(str, sizeof(str), "tool/%s/", tool_pmu__event_to_str(ev));
>> 	else
>> diff --git a/tools/perf/util/tool_pmu.c b/tools/perf/util/tool_pmu.c
>> index 3a68debe7143..572422797f6e 100644
>> --- a/tools/perf/util/tool_pmu.c
>> +++ b/tools/perf/util/tool_pmu.c
>> @@ -60,6 +60,15 @@ int tool_pmu__num_skip_events(void)
>> 	return num;
>> }
>> 
>> +/*
>> + * tool_pmu__event_to_str returns only supported event names.
>> + * For events which are supposed to be skipped in the platform,
>> + * return NULL
>> + *
>> + * tool_pmu__all_event_to_str returns the name for all
>> + * events mapping to the tool_pmu_event index including the
>> + * skipped ones.
>> + */
>> const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>> {
>> 	if ((ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX) &&
>> @@ -69,6 +78,14 @@ const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>> 	return NULL;
>> }
>> 
>> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev)
>> +{
>> +	if (ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX)
>> +		return tool_pmu__event_names[ev];
>> +
>> +	return NULL;
>> +}
>> +
>> enum tool_pmu_event tool_pmu__str_to_event(const char *str)
>> {
>> 	int i;
>> diff --git a/tools/perf/util/tool_pmu.h b/tools/perf/util/tool_pmu.h
>> index a60184859080..da76808ae71e 100644
>> --- a/tools/perf/util/tool_pmu.h
>> +++ b/tools/perf/util/tool_pmu.h
>> @@ -30,6 +30,7 @@ enum tool_pmu_event {
>> 	for ((ev) = TOOL_PMU__EVENT_DURATION_TIME; (ev) < TOOL_PMU__EVENT_MAX; ev++)
>> 
>> const char *tool_pmu__event_to_str(enum tool_pmu_event ev);
>> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev);
>> enum tool_pmu_event tool_pmu__str_to_event(const char *str);
>> bool tool_pmu__skip_event(const char *name);
>> int tool_pmu__num_skip_events(void);
>> -- 
>> 2.43.5


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Re: [PATCH] tools/perf: Add check to tool pmu tests to ensure if the event is valid

[Athira Rajeev]

> On 13 Feb 2025, at 9:04 AM, Namhyung Kim <namhyung@kernel.org> wrote:
> 
> On Thu, Feb 13, 2025 at 12:24:38AM +0530, Athira Rajeev wrote:
>> "Tool PMU" tests fails on powerpc as below:
>> 
>>   12.1: Parsing without PMU name:
>>   --- start ---
>>   test child forked, pid 48492
>>   Using CPUID 0x00800200
>>   Attempt to add: tool/duration_time/
>>   ..after resolving event: tool/config=0x1/
>>   duration_time -> tool/duration_time/
>>   Attempt to add: tool/user_time/
>>   ..after resolving event: tool/config=0x2/
>>   user_time -> tool/user_time/
>>   Attempt to add: tool/system_time/
>>   ..after resolving event: tool/config=0x3/
>>   system_time -> tool/system_time/
>>   Attempt to add: tool/has_pmem/
>>   ..after resolving event: tool/config=0x4/
>>   has_pmem -> tool/has_pmem/
>>   Attempt to add: tool/num_cores/
>>   ..after resolving event: tool/config=0x5/
>>   num_cores -> tool/num_cores/
>>   Attempt to add: tool/num_cpus/
>>   ..after resolving event: tool/config=0x6/
>>   num_cpus -> tool/num_cpus/
>>   Attempt to add: tool/num_cpus_online/
>>   ..after resolving event: tool/config=0x7/
>>   num_cpus_online -> tool/num_cpus_online/
>>   Attempt to add: tool/num_dies/
>>   ..after resolving event: tool/config=0x8/
>>   num_dies -> tool/num_dies/
>>   Attempt to add: tool/num_packages/
>>   ..after resolving event: tool/config=0x9/
>>   num_packages -> tool/num_packages/
>> 
>>   ---- unexpected signal (11) ----
>>   12.1: Parsing without PMU name                                      : FAILED!
>> 
>> Same fail is observed for "Parsing with PMU name" as well.
>> 
>> The testcase loops through events in tool_pmu__for_each_event()
>> and access event name using "tool_pmu__event_to_str()".
>> Here tool_pmu__event_to_str returns null for "slots" event
>> and "system_tsc_freq" event. These two events are only applicable
>> for arm64 and x86 respectively. So the function tool_pmu__event_to_str()
>> skips for unsupported events and returns null. This null value is
>> causing testcase fail.
>> 
>> To address this in "Tool PMU" testcase, add a helper function
>> tool_pmu__all_event_to_str() which returns the name for all
>> events mapping to the tool_pmu_event index including the
>> skipped ones. So that even if its a skipped event, the
>> helper function helps to resolve the tool_pmu_event index to
>> its mapping event name. Update the testcase to check for null event
>> names before proceeding the test.
>> 
>> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
> 
> Please take a look at:
> https://lore.kernel.org/r/20250212163859.1489916-1-james.clark@linaro.org
> 
> Thanks,
> Namhyung

Hi,

Sure thanks for the fix James

Thomas,
Thanks for testing this patch.  But James already fixed this with a different patch and it is part of perf-tools-next
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/commit/?h=perf-tools-next&id=615ec00b06f78912c370b372426190768402a5b9

Please test with latest perf-tools-next 

Thanks
Athira

> 
>> ---
>> tools/perf/tests/tool_pmu.c | 12 ++++++++++++
>> tools/perf/util/tool_pmu.c  | 17 +++++++++++++++++
>> tools/perf/util/tool_pmu.h  |  1 +
>> 3 files changed, 30 insertions(+)
>> 
>> diff --git a/tools/perf/tests/tool_pmu.c b/tools/perf/tests/tool_pmu.c
>> index 187942b749b7..e468e5fb3c73 100644
>> --- a/tools/perf/tests/tool_pmu.c
>> +++ b/tools/perf/tests/tool_pmu.c
>> @@ -19,6 +19,18 @@ static int do_test(enum tool_pmu_event ev, bool with_pmu)
>> return TEST_FAIL;
>> }
>> 
>> + /*
>> +  * if tool_pmu__event_to_str returns NULL, Check if the event is
>> +  * valid for the platform.
>> +  * Example:
>> +  * slots event is only on arm64.
>> +  * system_tsc_freq event is only on x86.
>> +  */
>> + if (!tool_pmu__event_to_str(ev) && tool_pmu__skip_event(tool_pmu__all_event_to_str(ev))) {
>> + ret = TEST_OK;
>> + goto out;
>> + }
>> +
>> if (with_pmu)
>> snprintf(str, sizeof(str), "tool/%s/", tool_pmu__event_to_str(ev));
>> else
>> diff --git a/tools/perf/util/tool_pmu.c b/tools/perf/util/tool_pmu.c
>> index 3a68debe7143..572422797f6e 100644
>> --- a/tools/perf/util/tool_pmu.c
>> +++ b/tools/perf/util/tool_pmu.c
>> @@ -60,6 +60,15 @@ int tool_pmu__num_skip_events(void)
>> return num;
>> }
>> 
>> +/*
>> + * tool_pmu__event_to_str returns only supported event names.
>> + * For events which are supposed to be skipped in the platform,
>> + * return NULL
>> + *
>> + * tool_pmu__all_event_to_str returns the name for all
>> + * events mapping to the tool_pmu_event index including the
>> + * skipped ones.
>> + */
>> const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>> {
>> if ((ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX) &&
>> @@ -69,6 +78,14 @@ const char *tool_pmu__event_to_str(enum tool_pmu_event ev)
>> return NULL;
>> }
>> 
>> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev)
>> +{
>> + if (ev > TOOL_PMU__EVENT_NONE && ev < TOOL_PMU__EVENT_MAX)
>> + return tool_pmu__event_names[ev];
>> +
>> + return NULL;
>> +}
>> +
>> enum tool_pmu_event tool_pmu__str_to_event(const char *str)
>> {
>> int i;
>> diff --git a/tools/perf/util/tool_pmu.h b/tools/perf/util/tool_pmu.h
>> index a60184859080..da76808ae71e 100644
>> --- a/tools/perf/util/tool_pmu.h
>> +++ b/tools/perf/util/tool_pmu.h
>> @@ -30,6 +30,7 @@ enum tool_pmu_event {
>> for ((ev) = TOOL_PMU__EVENT_DURATION_TIME; (ev) < TOOL_PMU__EVENT_MAX; ev++)
>> 
>> const char *tool_pmu__event_to_str(enum tool_pmu_event ev);
>> +const char *tool_pmu__all_event_to_str(enum tool_pmu_event ev);
>> enum tool_pmu_event tool_pmu__str_to_event(const char *str);
>> bool tool_pmu__skip_event(const char *name);
>> int tool_pmu__num_skip_events(void);
>> -- 
>> 2.43.5