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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>
[ merge_attr returns a **, not just * ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2013-01-24 16:10:25 +01:00 committed by Arnaldo Carvalho de Melo
parent 328ccdace8
commit 1a6461b128
2 changed files with 35 additions and 0 deletions
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34
arch/x86/kernel/cpu/perf_event.c
View File

@ -1330,6 +1330,32 @@ 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)
{
@ -1469,6 +1495,14 @@ 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);

1
arch/x86/kernel/cpu/perf_event.h
View File

@ -357,6 +357,7 @@ struct x86_pmu {
struct attribute **format_attrs;
ssize_t (*events_sysfs_show)(char *page, u64 config);
struct attribute **cpu_events;
/*
* CPU Hotplug hooks