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| author | Andi Kleen <ak@linux.intel.com> | 2013-01-24 19:10:25 +0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-03-26 23:50:23 +0400 |
| commit | 1a6461b12872e9622c231928e1620504d741cc79 (patch) | |
| tree | ebf093761ebd3a98caf71013a14601ff7b51fe1e | |
| parent | 328ccdace8855289ad114b70ee1464ba5e3f6436 (diff) | |
| download | linux-1a6461b12872e9622c231928e1620504d741cc79.tar.xz | |
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>
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 34 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.h | 1 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index bf0f01aea994..c886dc8c63f8 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -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); diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h index 7f5c75c2afdd..95152c12a8d9 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -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 |