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ARCv2: perf: implement exclusion of event counting in user or kernel mode

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Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Alexey Brodkin 2015-08-24 13:53:36 +03:00 committed by Vineet Gupta
parent 36481cf7fb
commit e6b1d126bb
2 changed files with 17 additions and 2 deletions
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3
arch/arc/include/asm/perf_event.h
View file

@ -34,6 +34,9 @@
#define ARC_REG_PCT_INT_CTRL 0x25E
#define ARC_REG_PCT_INT_ACT 0x25F
#define ARC_REG_PCT_CONFIG_USER (1 << 18) /* count in user mode */
#define ARC_REG_PCT_CONFIG_KERN (1 << 19) /* count in kernel mode */
#define ARC_REG_PCT_CONTROL_CC (1 << 16) /* clear counts */
#define ARC_REG_PCT_CONTROL_SN (1 << 17) /* snapshot */

16
arch/arc/kernel/perf_event.c
View file

@ -147,13 +147,25 @@ static int arc_pmu_event_init(struct perf_event *event)
local64_set(&hwc->period_left, hwc->sample_period);
}
hwc->config = 0;
if (is_isa_arcv2()) {
/* "exclude user" means "count only kernel" */
if (event->attr.exclude_user)
hwc->config |= ARC_REG_PCT_CONFIG_KERN;
/* "exclude kernel" means "count only user" */
if (event->attr.exclude_kernel)
hwc->config |= ARC_REG_PCT_CONFIG_USER;
}
switch (event->attr.type) {
case PERF_TYPE_HARDWARE:
if (event->attr.config >= PERF_COUNT_HW_MAX)
return -ENOENT;
if (arc_pmu->ev_hw_idx[event->attr.config] < 0)
return -ENOENT;
hwc->config = arc_pmu->ev_hw_idx[event->attr.config];
hwc->config |= arc_pmu->ev_hw_idx[event->attr.config];
pr_debug("init event %d with h/w %d \'%s\'\n",
(int) event->attr.config, (int) hwc->config,
arc_pmu_ev_hw_map[event->attr.config]);
@ -163,7 +175,7 @@ static int arc_pmu_event_init(struct perf_event *event)
ret = arc_pmu_cache_event(event->attr.config);
if (ret < 0)
return ret;
hwc->config = arc_pmu->ev_hw_idx[ret];
hwc->config |= arc_pmu->ev_hw_idx[ret];
return 0;
default:
return -ENOENT;