linux-kernel - [PATCH v3 02/11] perf: add PMU_FORMAT_RANGE() helper for use by sw-like pmus

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Message-Id: <1393535105-7528-3-git-send-email-cody@linux.vnet.ibm.com>
Date:	Thu, 27 Feb 2014 13:04:55 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <michael@...erman.id.au>,
	scottwood@...escale.com, Peter Zijlstra <peterz@...radead.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH v3 02/11] perf: add PMU_FORMAT_RANGE() helper for use by sw-like pmus

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 <cody@...ux.vnet.ibm.com>
---
 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..3da5081 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_FORMAT_RANGE(name, attr_var, bit_start, bit_end)		\
+PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end);		\
+PMU_FORMAT_RANGE_RESERVED(name, attr_var, bit_start, bit_end)
+
+#define PMU_FORMAT_RANGE_RESERVED(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 */
-- 
1.9.0

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