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Date: Wed, 7 Nov 2012 11:19:28 -0800
From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
Anton Blanchard <anton@....ibm.com>, robert.richter@....com
Cc: linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] perf/POWER7: Make event translations available in sysfs
>From d05d1ce6d55bf339eee6230ded9f5dd1351f60e5 Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Date: Tue, 6 Nov 2012 14:07:36 -0800
Subject: [PATCH 3/4] perf/POWER7: Make event translations available in sysfs
Make the perf events supported by POWER7 available via sysfs.
$ ls /sys/bus/event_source/devices/cpu/events
branch-instructions
branch-misses
cache-misses
cache-references
cpu-cycles
instructions
stalled-cycles-backend
stalled-cycles-frontend
$ cat /sys/bus/event_source/devices/cpu/events/cache-misses
event=0x03
This patch is based on commits that implement this functionality on x86.
Eg:
commit a47473939db20e3961b200eb00acf5fcf084d755
Author: Jiri Olsa <jolsa@...hat.com>
Date: Wed Oct 10 14:53:11 2012 +0200
perf/x86: Make hardware event translations available in sysfs
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
arch/powerpc/include/asm/perf_event_server.h | 21 +++++++++++++++++
arch/powerpc/perf/core-book3s.c | 12 +++++++++
arch/powerpc/perf/power7-pmu.c | 32 ++++++++++++++++++++++++++
3 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index 9710be3..ad84f73 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h
@@ -11,6 +11,8 @@
#include <linux/types.h>
#include <asm/hw_irq.h>
+#include <linux/sysfs.h>
+#include <linux/device.h>
#define MAX_HWEVENTS 8
#define MAX_EVENT_ALTERNATIVES 8
@@ -35,6 +37,7 @@ struct power_pmu {
void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
int (*limited_pmc_event)(u64 event_id);
u32 flags;
+ const struct attribute_group **attr_groups;
int n_generic;
int *generic_events;
int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
@@ -109,3 +112,21 @@ extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
* If an event_id is not subject to the constraint expressed by a particular
* field, then it will have 0 in both the mask and value for that field.
*/
+
+
+struct perf_pmu_events_attr {
+ struct device_attribute attr;
+ u64 id;
+};
+
+extern ssize_t power_events_sysfs_show(struct device *dev,
+ struct device_attribute *attr, char *page);
+
+#define EVENT_VAR(_id) event_attr_##_id
+#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
+
+#define EVENT_ATTR(_name, _id) \
+ static struct perf_pmu_events_attr EVENT_VAR(_id) = { \
+ .attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
+ .id = PM_##_id, \
+ };
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index aa2465e..19b23bd 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -1305,6 +1305,16 @@ static int power_pmu_event_idx(struct perf_event *event)
return event->hw.idx;
}
+ssize_t power_events_sysfs_show(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ struct perf_pmu_events_attr *pmu_attr;
+
+ pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
+
+ return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+}
+
struct pmu power_pmu = {
.pmu_enable = power_pmu_enable,
.pmu_disable = power_pmu_disable,
@@ -1537,6 +1547,8 @@ int __cpuinit register_power_pmu(struct power_pmu *pmu)
pr_info("%s performance monitor hardware support registered\n",
pmu->name);
+ power_pmu.attr_groups = ppmu->attr_groups;
+
#ifdef MSR_HV
/*
* Use FCHV to ignore kernel events if MSR.HV is set.
diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c
index 256db4f..31c61ab 100644
--- a/arch/powerpc/perf/power7-pmu.c
+++ b/arch/powerpc/perf/power7-pmu.c
@@ -360,6 +360,37 @@ static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
},
};
+EVENT_ATTR(cpu-cycles, CYC);
+EVENT_ATTR(stalled-cycles-frontend, GCT_NOSLOT_CYC);
+EVENT_ATTR(stalled-cycles-backend, CMPLU_STALL);
+EVENT_ATTR(instructions, INST_CMPL);
+EVENT_ATTR(cache-references, LD_REF_L1);
+EVENT_ATTR(cache-misses, LD_MISS_L1);
+EVENT_ATTR(branch-instructions, BRU_FIN);
+EVENT_ATTR(branch-misses, BRU_MPRED);
+
+static struct attribute *power7_events_attr[] = {
+ EVENT_PTR(CYC),
+ EVENT_PTR(GCT_NOSLOT_CYC),
+ EVENT_PTR(CMPLU_STALL),
+ EVENT_PTR(INST_CMPL),
+ EVENT_PTR(LD_REF_L1),
+ EVENT_PTR(LD_MISS_L1),
+ EVENT_PTR(BRU_FIN),
+ EVENT_PTR(BRU_MPRED),
+ NULL,
+};
+
+static struct attribute_group power7_pmu_events_group = {
+ .name = "events",
+ .attrs = power7_events_attr,
+};
+
+static const struct attribute_group *power7_pmu_attr_groups[] = {
+ &power7_pmu_events_group,
+ NULL,
+};
+
static struct power_pmu power7_pmu = {
.name = "POWER7",
.n_counter = 6,
@@ -371,6 +402,7 @@ static struct power_pmu power7_pmu = {
.get_alternatives = power7_get_alternatives,
.disable_pmc = power7_disable_pmc,
.flags = PPMU_ALT_SIPR,
+ .attr_groups = power7_pmu_attr_groups,
.n_generic = ARRAY_SIZE(power7_generic_events),
.generic_events = power7_generic_events,
.cache_events = &power7_cache_events,
--
1.7.1
--
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