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s390/cpum_sf: Filter perf events based event->attr.exclude_* settings

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Introduce the perf_exclude_event() function to filter perf samples
according to event->attr.exclude_* settings.   During event initialization,
reset event exclude settings that are not supported.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2013-12-12 18:05:20 +01:00 committed by Martin Schwidefsky
parent 443e802bab
commit dd127b3b97
1 changed files with 35 additions and 1 deletions
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36
arch/s390/kernel/perf_cpum_sf.c
View file

@ -723,10 +723,19 @@ static int cpumsf_pmu_event_init(struct perf_event *event)
return -ENOENT;
}
/* Check online status of the CPU to which the event is pinned */
if (event->cpu >= nr_cpumask_bits ||
(event->cpu >= 0 && !cpu_online(event->cpu)))
return -ENODEV;
/* Force reset of idle/hv excludes regardless of what the
* user requested.
*/
if (event->attr.exclude_hv)
event->attr.exclude_hv = 0;
if (event->attr.exclude_idle)
event->attr.exclude_idle = 0;
err = __hw_perf_event_init(event);
if (unlikely(err))
if (event->destroy)
@ -824,6 +833,29 @@ static void cpumsf_pmu_disable(struct pmu *pmu)
cpuhw->flags &= ~PMU_F_ENABLED;
}
/* perf_exclude_event() - Filter event
* @event: The perf event
* @regs: pt_regs structure
* @sde_regs: Sample-data-entry (sde) regs structure
*
* Filter perf events according to their exclude specification.
*
* Return non-zero if the event shall be excluded.
*/
static int perf_exclude_event(struct perf_event *event, struct pt_regs *regs,
struct perf_sf_sde_regs *sde_regs)
{
if (event->attr.exclude_user && user_mode(regs))
return 1;
if (event->attr.exclude_kernel && !user_mode(regs))
return 1;
if (event->attr.exclude_guest && sde_regs->in_guest)
return 1;
if (event->attr.exclude_host && !sde_regs->in_guest)
return 1;
return 0;
}
/* perf_push_sample() - Push samples to perf
* @event: The perf event
* @sample: Hardware sample data
@ -894,12 +926,14 @@ static int perf_push_sample(struct perf_event *event,
sde_regs->in_guest = 1;
overflow = 0;
if (perf_exclude_event(event, &regs, sde_regs))
goto out;
if (perf_event_overflow(event, &data, &regs)) {
overflow = 1;
event->pmu->stop(event, 0);
}
perf_event_update_userpage(event);
out:
return overflow;
}