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perf: added perf_event_count() method 

this allows drivers to get an event_count from a perf counter
This commit is contained in:
Andrew Tridgell 2013-09-12 16:21:24 +10:00 committed by Lorenz Meier
parent 0b7294a26e
commit 7257642371
2 changed files with 34 additions and 0 deletions
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26
src/modules/systemlib/perf_counter.c
View File

@ -321,6 +321,32 @@ perf_print_counter(perf_counter_t handle)
}
}
uint64_t
perf_event_count(perf_counter_t handle)
{
if (handle == NULL)
return 0;
switch (handle->type) {
case PC_COUNT:
return ((struct perf_ctr_count *)handle)->event_count;
case PC_ELAPSED: {
struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
return pce->event_count;
}
case PC_INTERVAL: {
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
return pci->event_count;
}
default:
break;
}
return 0;
}
void
perf_print_all(void)
{

8
src/modules/systemlib/perf_counter.h
View File

@ -135,6 +135,14 @@ __EXPORT extern void perf_print_all(void);
*/
__EXPORT extern void perf_reset_all(void);
/**
* Return current event_count
*
* @param handle The counter returned from perf_alloc.
* @return event_count
*/
__EXPORT extern uint64_t perf_event_count(perf_counter_t handle);
__END_DECLS
#endif