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powerpc/perf: Infrastructure to support addition of blacklisted events 

Introduce code to support addition of blacklisted events for a
processor version. Blacklisted events are events that are known to not
count correctly on that CPU revision, and so should be prevented from
being counted so as to avoid user confusion.

A 'pointer' and 'int' variable to hold the number of events are added
to 'struct power_pmu', along with a generic function to loop through
the list to validate the given event. Generic function
'is_event_blacklisted' is called in power_pmu_event_init() to detect
and reject early.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Madhavan Srinivasan 2018-03-04 17:26:26 +05:30 committed by Michael Ellerman
parent cd1231d703
commit b58064da04
2 changed files with 23 additions and 0 deletions
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2
arch/powerpc/include/asm/perf_event_server.h
View File

@ -53,6 +53,8 @@ struct power_pmu {
[PERF_COUNT_HW_CACHE_OP_MAX]
[PERF_COUNT_HW_CACHE_RESULT_MAX];
int n_blacklist_ev;
int *blacklist_ev;
/* BHRB entries in the PMU */
int bhrb_nr;
};

21
arch/powerpc/perf/core-book3s.c
View File

@ -1839,6 +1839,18 @@ static int hw_perf_cache_event(u64 config, u64 *eventp)
return 0;
}
static bool is_event_blacklisted(u64 ev)
{
int i;
for (i=0; i < ppmu->n_blacklist_ev; i++) {
if (ppmu->blacklist_ev[i] == ev)
return true;
}
return false;
}
static int power_pmu_event_init(struct perf_event *event)
{
u64 ev;
@ -1864,15 +1876,24 @@ static int power_pmu_event_init(struct perf_event *event)
ev = event->attr.config;
if (ev >= ppmu->n_generic || ppmu->generic_events[ev] == 0)
return -EOPNOTSUPP;
if (ppmu->blacklist_ev && is_event_blacklisted(ev))
return -EINVAL;
ev = ppmu->generic_events[ev];
break;
case PERF_TYPE_HW_CACHE:
err = hw_perf_cache_event(event->attr.config, &ev);
if (err)
return err;
if (ppmu->blacklist_ev && is_event_blacklisted(ev))
return -EINVAL;
break;
case PERF_TYPE_RAW:
ev = event->attr.config;
if (ppmu->blacklist_ev && is_event_blacklisted(ev))
return -EINVAL;
break;
default:
return -ENOENT;