perf/x86: Improve sysfs event mapping with event string

This patch extends Jiri's changes to make generic
events mapping visible via sysfs. The patch extends
the mechanism to non-generic events by allowing
the mappings to be hardcoded in strings.

This mechanism will be used by the PEBS-LL patch
later on.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Cc: acme@redhat.com
Cc: jolsa@redhat.com
Cc: namhyung.kim@lge.com
Link: http://lkml.kernel.org/r/1359040242-8269-3-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[ fixed up conflict with 2663960 "perf: Make EVENT_ATTR global" ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index c886dc8..6e8ab04 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1316,9 +1316,16 @@ static struct attribute_group x86_pmu_format_group = {
  */
 static void __init filter_events(struct attribute **attrs)
 {
+       struct device_attribute *d;
+       struct perf_pmu_events_attr *pmu_attr;
        int i, j;
 
        for (i = 0; attrs[i]; i++) {
+               d = (struct device_attribute *)attrs[i];
+               pmu_attr = container_of(d, struct perf_pmu_events_attr, attr);
+               /* str trumps id */
+               if (pmu_attr->event_str)
+                       continue;
                if (x86_pmu.event_map(i))
                        continue;
 
@@ -1361,17 +1368,14 @@ static ssize_t events_sysfs_show(struct device *dev, struct device_attribute *at
 {
        struct perf_pmu_events_attr *pmu_attr = \
                container_of(attr, struct perf_pmu_events_attr, attr);
-
        u64 config = x86_pmu.event_map(pmu_attr->id);
-       return x86_pmu.events_sysfs_show(page, config);
-}
 
-#define EVENT_VAR(_id)  event_attr_##_id
-#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
+       /* string trumps id */
+       if (pmu_attr->event_str)
+               return sprintf(page, "%s", pmu_attr->event_str);
 
-#define EVENT_ATTR(_name, _id)                                         \
-       PMU_EVENT_ATTR(_name, EVENT_VAR(_id), PERF_COUNT_HW_##_id,      \
-                       events_sysfs_show)
+       return x86_pmu.events_sysfs_show(page, config);
+}
 
 EVENT_ATTR(cpu-cycles,                 CPU_CYCLES              );
 EVENT_ATTR(instructions,               INSTRUCTIONS            );

diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 95152c1..b1518ee 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -422,6 +422,23 @@ do {                                                                       \
 #define ERF_NO_HT_SHARING      1
 #define ERF_HAS_RSP_1          2
 
+#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, events_sysfs_show, NULL), \
+       .id             = PERF_COUNT_HW_##_id,                          \
+       .event_str      = NULL,                                         \
+};
+
+#define EVENT_ATTR_STR(_name, v, str)                                  \
+static struct perf_pmu_events_attr event_attr_##v = {                  \
+       .attr           = __ATTR(_name, 0444, events_sysfs_show, NULL), \
+       .id             = 0,                                            \
+       .event_str      = str,                                          \
+};
+
 extern struct x86_pmu x86_pmu __read_mostly;
 
 DECLARE_PER_CPU(struct cpu_hw_events, cpu_hw_events);

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 8737e1c..1c59211 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -809,6 +809,7 @@ do {                                                                        \
 struct perf_pmu_events_attr {
        struct device_attribute attr;
        u64 id;
+       const char *event_str;
 };
 
 #define PMU_EVENT_ATTR(_name, _var, _id, _show)                                \