[PATCH v2 01/11] perf: add PMU_RANGE_ATTR() helper for use by sw-like pmus

From: Cody P Schafer
Date: Fri Feb 14 2014 - 17:06:53 EST


Add PMU_RANGE_ATTR() and PMU_RANGE_RESV() (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 <cody@xxxxxxxxxxxxxxxxxx>
---
include/linux/perf_event.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e56b07f..2702e91 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -871,4 +871,21 @@ _name##_show(struct device *dev, \
\
static struct device_attribute format_attr_##_name = __ATTR_RO(_name)

+#define PMU_RANGE_ATTR(name, attr_var, bit_start, bit_end) \
+PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end); \
+PMU_RANGE_RESV(name, attr_var, bit_start, bit_end)
+
+#define PMU_RANGE_RESV(name, attr_var, bit_start, bit_end) \
+static u64 event_get_##name##_max(void) \
+{ \
+ int bits = (bit_end) - (bit_start) + 1; \
+ return ((0x1ULL << (bits - 1ULL)) - 1ULL) | \
+ (0xFULL << (bits - 4ULL)); \
+} \
+static u64 event_get_##name(struct perf_event *event) \
+{ \
+ return (event->attr.attr_var >> (bit_start)) & \
+ event_get_##name##_max(); \
+}
+
#endif /* _LINUX_PERF_EVENT_H */
--
1.8.5.4

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