[PATCH v3 4/6] ARCv2: perf: implement exclusion of event counting in user or kernel mode

[Alexey Brodkin]

Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx>
---

No changes since v2.

No changes since v1.

 arch/arc/include/asm/perf_event.h |  3 +++
 arch/arc/kernel/perf_event.c      | 16 ++++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/arc/include/asm/perf_event.h b/arch/arc/include/asm/perf_event.h
index 9ed593e..876e216 100644
--- a/arch/arc/include/asm/perf_event.h
+++ b/arch/arc/include/asm/perf_event.h
@@ -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 */
 
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index ce0fa60..997ccbd 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -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;
-- 
2.4.3

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