linux-kernel - [PATCH 08/10][v6] powerpc/perf: Define big-endian version of perf_mem_data

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Date:	Tue, 15 Oct 2013 19:06:40 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	<linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	Stephane Eranian <eranian@...gle.com>,
	Michael Ellerman <michaele@....ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Subject: [PATCH 08/10][v6] powerpc/perf: Define big-endian version of perf_mem_data_src

perf_mem_data_src is an union that is initialized via the ->val field
and accessed via the bitmap fields. For this to work on big endian
platforms, we also need a big-endian represenation of perf_mem_data_src.

Cc: Stephane Eranian <eranian@...gle.com>
Cc: Michael Ellerman <michael@...erman.id.au>
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
Changelog [v6]
	- [Michael Ellerman] Use __BIG_ENDIAN_BITFIELD to simplify the
	  endian check.

Changelog [v5]:
	- perf_event.h includes <byteorder.h> which pulls in the local
	  byteorder.h when building the perf tool. This local byteorder.h
	  leaves __LITTLE_ENDIAN and __BIG_ENDIAN undefined.
	  Include <endian.h> explicitly in the local byteorder.h.

Changelog [v2]:
	- [Vince Weaver, Michael Ellerman] No __KERNEL__ in uapi headers.

 include/uapi/linux/perf_event.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index ca1d90b..383052b7 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -695,6 +695,7 @@ enum perf_callchain_context {
 #define PERF_FLAG_FD_OUTPUT		(1U << 1)
 #define PERF_FLAG_PID_CGROUP		(1U << 2) /* pid=cgroup id, per-cpu mode only */
 
+#if defined(__LITTLE_ENDIAN_BITFIELD)
 union perf_mem_data_src {
 	__u64 val;
 	struct {
@@ -706,6 +707,21 @@ union perf_mem_data_src {
 			mem_rsvd:31;
 	};
 };
+#elif defined(__BIG_ENDIAN_BITFIELD)
+union perf_mem_data_src {
+	__u64 val;
+	struct {
+		__u64	mem_rsvd:31,
+			mem_dtlb:7,	/* tlb access */
+			mem_lock:2,	/* lock instr */
+			mem_snoop:5,	/* snoop mode */
+			mem_lvl:14,	/* memory hierarchy level */
+			mem_op:5;	/* type of opcode */
+	};
+};
+#else
+#error "Unknown endianness"
+#endif
 
 /* type of opcode (load/store/prefetch,code) */
 #define PERF_MEM_OP_NA		0x01 /* not available */
-- 
1.7.9.5

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