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Commit e6b1d126 authored by Alexey Brodkin's avatar Alexey Brodkin Committed by Vineet Gupta
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ARCv2: perf: implement exclusion of event counting in user or kernel mode 



Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 36481cf7

arch/arc/include/asm/perf_event.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

arch/arc/kernel/perf_event.c

+14 −2
Original line number Diff line number Diff line
@@ -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;