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Subject[tip:perf/x86] perf/x86: Support CPU specific sysfs events
Commit-ID:  4c38cd7b6641f3f2cdf9c4f450c2628e2e400c1e
Gitweb: http://git.kernel.org/tip/4c38cd7b6641f3f2cdf9c4f450c2628e2e400c1e
Author: Andi Kleen <ak@linux.intel.com>
AuthorDate: Thu, 24 Jan 2013 16:10:25 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 25 Jan 2013 10:19:00 +0100

perf/x86: Support CPU specific sysfs events

Add a way for the CPU initialization code to register additional
events, and merge them into the events attribute directory. Used
in the next patch.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: acme@redhat.com
Cc: jolsa@redhat.com
Cc: namhyung.kim@lge.com
Link: http://lkml.kernel.org/r/1359040242-8269-2-git-send-email-eranian@google.com
[ small cleanups ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/perf_event.c | 34 ++++++++++++++++++++++++++++++++++
arch/x86/kernel/cpu/perf_event.h | 1 +
2 files changed, 35 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 6774c17..f133091 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1335,6 +1335,32 @@ static void __init filter_events(struct attribute **attrs)
}
}

+/* Merge two pointer arrays */
+static __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
+{
+ struct attribute **new;
+ int j, i;
+
+ for (j = 0; a[j]; j++)
+ ;
+ for (i = 0; b[i]; i++)
+ j++;
+ j++;
+
+ new = kmalloc(sizeof(struct attribute *) * j, GFP_KERNEL);
+ if (!new)
+ return NULL;
+
+ j = 0;
+ for (i = 0; a[i]; i++)
+ new[j++] = a[i];
+ for (i = 0; b[i]; i++)
+ new[j++] = b[i];
+ new[j] = NULL;
+
+ return new;
+}
+
static ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
char *page)
{
@@ -1476,6 +1502,14 @@ static int __init init_hw_perf_events(void)
else
filter_events(x86_pmu_events_group.attrs);

+ if (x86_pmu.cpu_events) {
+ struct attribute *tmp;
+
+ tmp = merge_attr(x86_pmu_events_group.attrs, x86_pmu.cpu_events);
+ if (!WARN_ON(!tmp))
+ x86_pmu_events_group.attrs = tmp;
+ }
+
pr_info("... version: %d\n", x86_pmu.version);
pr_info("... bit width: %d\n", x86_pmu.cntval_bits);
pr_info("... generic registers: %d\n", x86_pmu.num_counters);
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 115c1ea..4170043 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -355,6 +355,7 @@ struct x86_pmu {
struct attribute **format_attrs;

ssize_t (*events_sysfs_show)(char *page, u64 config);
+ struct attribute **cpu_events;

/*
* CPU Hotplug hooks

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