diff options
| author | Andi Kleen <ak@linux.intel.com> | 2017-08-22 11:52:01 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-08-25 11:04:20 +0200 |
| commit | b00233b5306512a09e339d69ef5e390a77f2d302 (patch) | |
| tree | 7422f4c5242cdecb440392915b36371fe42028c3 /arch/x86/events/perf_event.h | |
| parent | a5df70c354c26e20d5fd8eb64517f724e97ef0b2 (diff) | |
perf/x86: Export some PMU attributes in caps/ directory
It can be difficult to figure out for user programs what features
the x86 CPU PMU driver actually supports. Currently it requires
grepping in dmesg, but dmesg is not always available.
This adds a caps directory to /sys/bus/event_source/devices/cpu/,
similar to the caps already used on intel_pt, which can be used to
discover the available capabilities cleanly.
Three capabilities are defined:
- pmu_name: Underlying CPU name known to the driver
- max_precise: Max precise level supported
- branches: Known depth of LBR.
Example:
% grep . /sys/bus/event_source/devices/cpu/caps/*
/sys/bus/event_source/devices/cpu/caps/branches:32
/sys/bus/event_source/devices/cpu/caps/max_precise:3
/sys/bus/event_source/devices/cpu/caps/pmu_name:skylake
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170822185201.9261-3-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/events/perf_event.h')
| -rw-r--r-- | arch/x86/events/perf_event.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 0f7dad8bd358..9337589014cc 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -558,6 +558,7 @@ struct x86_pmu { int attr_rdpmc; struct attribute **format_attrs; struct attribute **event_attrs; + struct attribute **caps_attrs; ssize_t (*events_sysfs_show)(char *page, u64 config); struct attribute **cpu_events; @@ -742,6 +743,8 @@ int x86_reserve_hardware(void); void x86_release_hardware(void); +int x86_pmu_max_precise(void); + void hw_perf_lbr_event_destroy(struct perf_event *event); int x86_setup_perfctr(struct perf_event *event); |