perf/x86: Add is_visible attribute_group callback for base events

We dont need to pre-filter out unsupported base events,
we can just use its group's is_visible function to do this.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190512155518.21468-6-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index db815ceb501776ed57dc3141fd099ae818ef402b..b831091d4c106a2fedf40eca4fe94aefd48fb169 100644 (file)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1618,42 +1618,6 @@ static struct attribute_group x86_pmu_format_group __ro_after_init = {
        .attrs = NULL,
 };
 
-/*
- * Remove all undefined events (x86_pmu.event_map(id) == 0)
- * out of events_attr attributes.
- */
-static void __init filter_events(struct attribute **attrs)
-{
-       struct device_attribute *d;
-       struct perf_pmu_events_attr *pmu_attr;
-       int offset = 0;
-       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 + offset))
-                       continue;
-
-               for (j = i; attrs[j]; j++)
-                       attrs[j] = attrs[j + 1];
-
-               /* Check the shifted attr. */
-               i--;
-
-               /*
-                * event_map() is index based, the attrs array is organized
-                * by increasing event index. If we shift the events, then
-                * we need to compensate for the event_map(), otherwise
-                * we are looking up the wrong event in the map
-                */
-               offset++;
-       }
-}
-
 /* Merge two pointer arrays */
 __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
 {
@@ -1744,9 +1708,24 @@ static struct attribute *events_attr[] = {
        NULL,
 };
 
+/*
+ * Remove all undefined events (x86_pmu.event_map(id) == 0)
+ * out of events_attr attributes.
+ */
+static umode_t
+is_visible(struct kobject *kobj, struct attribute *attr, int idx)
+{
+       struct perf_pmu_events_attr *pmu_attr;
+
+       pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr);
+       /* str trumps id */
+       return pmu_attr->event_str || x86_pmu.event_map(idx) ? attr->mode : 0;
+}
+
 static struct attribute_group x86_pmu_events_group __ro_after_init = {
        .name = "events",
        .attrs = events_attr,
+       .is_visible = is_visible,
 };
 
 ssize_t x86_event_sysfs_show(char *page, u64 config, u64 event)
@@ -1852,8 +1831,6 @@ static int __init init_hw_perf_events(void)
 
        if (!x86_pmu.events_sysfs_show)
                x86_pmu_events_group.attrs = &empty_attrs;
-       else
-               filter_events(x86_pmu_events_group.attrs);
 
        if (x86_pmu.attrs) {
                struct attribute **tmp;