From 43c032febde48aabcf6d59f47cdcb7b5debbdc63 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 10 Oct 2012 14:53:13 +0200 Subject: [PATCH] perf/x86: Add hardware events translations for Intel cpus Add 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 Signed-off-by: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Paul Mackerras Cc: Corey Ashford Cc: Frederic Weisbecker Cc: Stephane Eranian Cc: Linus Torvalds Cc: Andrew Morton Cc: Thomas Gleixner Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1349873598-12583-4-git-send-email-jolsa@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event.c | 40 ++++++++++++++++++++++++++ arch/x86/kernel/cpu/perf_event.h | 2 ++ arch/x86/kernel/cpu/perf_event_intel.c | 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 39737a678a86..8a1fa23452d6 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1392,6 +1392,46 @@ 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.h b/arch/x86/kernel/cpu/perf_event.h index 6f75b6a7f37c..f8aa2f6677f2 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -538,6 +538,8 @@ static inline void set_linear_ip(struct pt_regs *regs, unsigned long ip) regs->ip = ip; } +ssize_t x86_event_sysfs_show(char *page, u64 config); + #ifdef CONFIG_CPU_SUP_AMD int amd_pmu_init(void); diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index 324bb523d9d9..6106d3b44aa1 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, -- 2.20.1