[PATCH v4 02/11] perf: add PMU_FORMAT_RANGE() helper for use by sw-like pmus
From: Cody P Schafer <hidden>
Date: 2014-03-06 00:04:54
Also in:
lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
Add PMU_FORMAT_RANGE() and PMU_FORMAT_RANGE_RESERVED() (for reserved
areas) which generate functions to extract the relevent bits from
event->attr.config{,1,2} for use by sw-like pmus where the
'config{,1,2}' values don't map directly to hardware registers.
Signed-off-by: Cody P Schafer <redacted>
---
include/linux/perf_event.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e56b07f..5c12009 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h@@ -871,4 +871,27 @@ _name##_show(struct device *dev, \ \ static struct device_attribute format_attr_##_name = __ATTR_RO(_name) +#define format_max(name) FORMAT_MAX_(name)() +#define FORMAT_MAX_(name) format_##name##_max + +#define format_get(name, event) FORMAT_GET_(name)(event) +#define FORMAT_GET_(name) format_get_##name + +#define PMU_FORMAT_RANGE(name, attr_var, bit_start, bit_end) \ +PMU_FORMAT_RANGE_RESERVED(name, attr_var, bit_start, bit_end) \ +PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end) + +#define PMU_FORMAT_RANGE_RESERVED(name, attr_var, bit_start, bit_end) \ +static u64 FORMAT_MAX_(name)(void) \ +{ \ + BUILD_BUG_ON((bit_start > bit_end) \ + || (bit_end >= (sizeof(1ull) * 8))); \ + return (((1ull << (bit_end - bit_start)) - 1) << 1) + 1; \ +} \ +static u64 FORMAT_GET_(name)(struct perf_event *event) \ +{ \ + return (event->attr.attr_var >> (bit_start)) & \ + format_max(name); \ +} + #endif /* _LINUX_PERF_EVENT_H */
--
1.9.0