Adding support for intel processors to display 'events' sysfs
directory (/sys/devices/cpu/events/) with hw event translations.
# ls /sys/devices/cpu/events/
branch-instructions
branch-misses
bus-cycles
cache-misses
cache-references
cpu-cycles
instructions
ref-cycles
stalled-cycles-backend
stalled-cycles-frontend
Suggested-by: Peter Zijlstra <a.p.zijls...@chello.nl>
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Stephane Eranian <eran...@google.com>
---
arch/x86/kernel/cpu/perf_event.c | 40 ++++++++++++++++++++++++++++++++++
arch/x86/kernel/cpu/perf_event_intel.c | 2 ++
include/linux/perf_event.h | 2 ++
3 files changed, 44 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 9b6f83c..1fbf319 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1384,6 +1384,46 @@ static struct attribute_group x86_pmu_events_group = {
.attrs = events_attr,
};
+ssize_t x86_event_sysfs_show(char *page, u64 config)
+{
+ u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT);
+ u64 umask = (config & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
+ u64 cmask = (config & ARCH_PERFMON_EVENTSEL_CMASK) >> 24;
+ bool edge = (config & ARCH_PERFMON_EVENTSEL_EDGE);
+ bool pc = (config & ARCH_PERFMON_EVENTSEL_PIN_CONTROL);
+ bool any = (config & ARCH_PERFMON_EVENTSEL_ANY);
+ bool inv = (config & ARCH_PERFMON_EVENTSEL_INV);
+ ssize_t ret;
+
+ /*
+ * We have whole page size to spend and just little data
+ * to write, so we can safely use sprintf.
+ */
+ ret = sprintf(page, "event=0x%02llx", event);
+
+ if (umask)
+ ret += sprintf(page + ret, ",umask=0x%02llx", umask);
+
+ if (edge)
+ ret += sprintf(page + ret, ",edge");
+
+ if (pc)
+ ret += sprintf(page + ret, ",pc");
+
+ if (any)
+ ret += sprintf(page + ret, ",any");
+
+ if (inv)
+ ret += sprintf(page + ret, ",inv");
+
+ if (cmask)
+ ret += sprintf(page + ret, ",cmask=0x%02llx", cmask);
+
+ ret += sprintf(page + ret, "\n");
+
+ return ret;
+}
+
static int __init init_hw_perf_events(void)
{
struct x86_pmu_quirk *quirk;
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c
b/arch/x86/kernel/cpu/perf_event_intel.c
index 7f2739e..f711ca2 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1628,6 +1628,7 @@ static __initconst const struct x86_pmu core_pmu = {
.event_constraints = intel_core_event_constraints,
.guest_get_msrs = core_guest_get_msrs,
.format_attrs = intel_arch_formats_attr,
+ .events_sysfs_show = x86_event_sysfs_show,
};
struct intel_shared_regs *allocate_shared_regs(int cpu)
@@ -1766,6 +1767,7 @@ static __initconst const struct x86_pmu intel_pmu = {
.pebs_aliases = intel_pebs_aliases_core2,
.format_attrs = intel_arch3_formats_attr,
+ .events_sysfs_show = x86_event_sysfs_show,
.cpu_prepare = intel_pmu_cpu_prepare,
.cpu_starting = intel_pmu_cpu_starting,
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 28f9cee..ee9c9d0 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1418,5 +1418,7 @@ _name##_show(struct device *dev,
\
\
static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
+ssize_t x86_event_sysfs_show(char *page, u64 config);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_PERF_EVENT_H */
--
1.7.11.4
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