[Intel-gfx] [PATCH i-g-t] intel_gpu_top: Improve error message when insufficient privilege

[Tvrtko Ursulin]

On 01/02/2022 16:10, Dixit, Ashutosh wrote:
> On Tue, 01 Feb 2022 07:19:46 -0800, Tvrtko Ursulin wrote:
>>
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>>
>> Print out end user friendly help text when the running user has
>> insufficient privilege for accessing system wide performance counters.
> 
> Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>

Pushed, thank you!

Regards,

Tvrtko

>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> Issue: https://gitlab.freedesktop.org/drm/intel/-/issues/5018
>> ---
>>   tools/intel_gpu_top.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
>> index 81c724d1fe1c..0404a5881b40 100644
>> --- a/tools/intel_gpu_top.c
>> +++ b/tools/intel_gpu_top.c
>> @@ -1761,6 +1761,15 @@ int main(int argc, char **argv)
>> 	if (ret) {
>> 		fprintf(stderr,
>> 			"Failed to initialize PMU! (%s)\n", strerror(errno));
>> +		if (errno == EACCES && geteuid())
>> +			fprintf(stderr,
>> +"\n"
>> +"When running as a normal user CAP_PERFMON is required to access performance\n"
>> +"monitoring. See \"man 7 capabilities\", \"man 8 setcap\", or contact your\n"
>> +"distribution vendor for assistance.\n"
>> +"\n"
>> +"More information can be found at 'Perf events and tool security' document:\n"
>> +"https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n");
>> 		ret = EXIT_FAILURE;
>> 		goto err;
>> 	}
>> --
>> 2.32.0
>>