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 <a.p.zijlstra@chello.nl>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1349873598-12583-4-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 44 insertions, 0 deletions

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,