[PATCH 1/4] perf/powerpc: Use uapi/unistd.h to fix build error

From b8beef080260c1625c8f801105504a82005295e5 Mon Sep 17 00:00:00 2001

From: Sukadev Bhattiprolu <redacted>
Date: Wed, 31 Oct 2012 11:21:28 -0700
Subject: [PATCH 1/4] perf/powerpc: Use uapi/unistd.h to fix build error

Use the 'unistd.h' from arch/powerpc/include/uapi to build the perf tool.

Signed-off-by: Sukadev Bhattiprolu <redacted>
---
 tools/perf/perf.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 054182e..f4952da 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h

@@ -26,7 +26,7 @@ void get_term_dimensions(struct winsize *ws);
 #endif
 
 #ifdef __powerpc__
-#include "../../arch/powerpc/include/asm/unistd.h"
+#include "../../arch/powerpc/include/uapi/asm/unistd.h"
 #define rmb()		asm volatile ("sync" ::: "memory")
 #define cpu_relax()	asm volatile ("" ::: "memory");
 #define CPUINFO_PROC	"cpu"

-- 
1.7.1

From 8a0dbd8f3fce2834292efa50c15ca64d4f6a6536 Mon Sep 17 00:00:00 2001

From: Sukadev Bhattiprolu <redacted>
Date: Wed, 7 Nov 2012 09:36:14 -0800
Subject: [PATCH 2/4] perf/Power7: Use macros to identify perf events

Define and use macros to identify perf events codes This would make it
easier and more readable when these event codes need to be used in more
than one place.

Signed-off-by: Sukadev Bhattiprolu <redacted>
---
 arch/powerpc/perf/power7-pmu.c |   25 +++++++++++++++++--------
 1 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c
index 441af08..256db4f 100644
--- a/arch/powerpc/perf/power7-pmu.c
+++ b/arch/powerpc/perf/power7-pmu.c

@@ -295,15 +295,24 @@ static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 		mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 }
 
+#define	PM_CYC				0x1e
+#define	PM_GCT_NOSLOT_CYC		0x100f8
+#define	PM_CMPLU_STALL			0x4000a
+#define	PM_INST_CMPL			0x2
+#define	PM_LD_REF_L1			0xc880
+#define	PM_LD_MISS_L1			0x400f0
+#define	PM_BRU_FIN			0x10068
+#define	PM_BRU_MPRED			0x400f6
+
 static int power7_generic_events[] = {
-	[PERF_COUNT_HW_CPU_CYCLES] = 0x1e,
-	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x100f8, /* GCT_NOSLOT_CYC */
-	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x4000a,  /* CMPLU_STALL */
-	[PERF_COUNT_HW_INSTRUCTIONS] = 2,
-	[PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880,	/* LD_REF_L1_LSU*/
-	[PERF_COUNT_HW_CACHE_MISSES] = 0x400f0,		/* LD_MISS_L1	*/
-	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068,	/* BRU_FIN	*/
-	[PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6,	/* BR_MPRED	*/
+	[PERF_COUNT_HW_CPU_CYCLES] = 			PM_CYC,
+	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 	PM_GCT_NOSLOT_CYC,
+	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 	PM_CMPLU_STALL,
+	[PERF_COUNT_HW_INSTRUCTIONS] = 			PM_INST_CMPL,
+	[PERF_COUNT_HW_CACHE_REFERENCES] = 		PM_LD_REF_L1,
+	[PERF_COUNT_HW_CACHE_MISSES] = 			PM_LD_MISS_L1,
+	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 		PM_BRU_FIN,
+	[PERF_COUNT_HW_BRANCH_MISSES] = 		PM_BRU_MPRED,
 };
 
 #define C(x)	PERF_COUNT_HW_CACHE_##x

-- 
1.7.1

From d05d1ce6d55bf339eee6230ded9f5dd1351f60e5 Mon Sep 17 00:00:00 2001

From: Sukadev Bhattiprolu <redacted>
Date: Tue, 6 Nov 2012 14:07:36 -0800
Subject: [PATCH 3/4] perf/POWER7: Make event translations available in sysfs

Make the perf events supported by POWER7 available via sysfs.

	$ ls /sys/bus/event_source/devices/cpu/events
	branch-instructions
	branch-misses
	cache-misses
	cache-references
	cpu-cycles
	instructions
	stalled-cycles-backend
	stalled-cycles-frontend

	$ cat /sys/bus/event_source/devices/cpu/events/cache-misses
	event=0x03

This patch is based on commits that implement this functionality on x86.
Eg:
	commit a47473939db20e3961b200eb00acf5fcf084d755
	Author: Jiri Olsa [off-list ref]
	Date:   Wed Oct 10 14:53:11 2012 +0200

	    perf/x86: Make hardware event translations available in sysfs

Signed-off-by: Sukadev Bhattiprolu <redacted>
---
 arch/powerpc/include/asm/perf_event_server.h |   21 +++++++++++++++++
 arch/powerpc/perf/core-book3s.c              |   12 +++++++++
 arch/powerpc/perf/power7-pmu.c               |   32 ++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index 9710be3..ad84f73 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h

@@ -11,6 +11,8 @@
 
 #include <linux/types.h>
 #include <asm/hw_irq.h>
+#include <linux/sysfs.h>
+#include <linux/device.h>
 
 #define MAX_HWEVENTS		8
 #define MAX_EVENT_ALTERNATIVES	8

@@ -35,6 +37,7 @@ struct power_pmu {
 	void		(*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
 	int		(*limited_pmc_event)(u64 event_id);
 	u32		flags;
+	const struct attribute_group	**attr_groups;
 	int		n_generic;
 	int		*generic_events;
 	int		(*cache_events)[PERF_COUNT_HW_CACHE_MAX]

@@ -109,3 +112,21 @@ extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
  * If an event_id is not subject to the constraint expressed by a particular
  * field, then it will have 0 in both the mask and value for that field.
  */
+
+
+struct perf_pmu_events_attr {
+	struct device_attribute attr;
+	u64 id;
+};
+
+extern ssize_t power_events_sysfs_show(struct device *dev,
+				struct device_attribute *attr, char *page);
+
+#define EVENT_VAR(_id)	event_attr_##_id
+#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
+
+#define EVENT_ATTR(_name, _id)                                             \
+	static struct perf_pmu_events_attr EVENT_VAR(_id) = {              \
+		.attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
+		.id   = PM_##_id,                                               \
+	};

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index aa2465e..19b23bd 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c

@@ -1305,6 +1305,16 @@ static int power_pmu_event_idx(struct perf_event *event)
 	return event->hw.idx;
 }
 
+ssize_t power_events_sysfs_show(struct device *dev,
+				struct device_attribute *attr, char *page)
+{
+       struct perf_pmu_events_attr *pmu_attr;
+       
+       pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
+        
+       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+}
+
 struct pmu power_pmu = {
 	.pmu_enable	= power_pmu_enable,
 	.pmu_disable	= power_pmu_disable,

@@ -1537,6 +1547,8 @@ int __cpuinit register_power_pmu(struct power_pmu *pmu)
 	pr_info("%s performance monitor hardware support registered\n",
 		pmu->name);
 
+	power_pmu.attr_groups = ppmu->attr_groups;
+
 #ifdef MSR_HV
 	/*
 	 * Use FCHV to ignore kernel events if MSR.HV is set.

diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c
index 256db4f..31c61ab 100644
--- a/arch/powerpc/perf/power7-pmu.c
+++ b/arch/powerpc/perf/power7-pmu.c

@@ -360,6 +360,37 @@ static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 	},
 };
 
+EVENT_ATTR(cpu-cycles,                 CYC);
+EVENT_ATTR(stalled-cycles-frontend,    GCT_NOSLOT_CYC);
+EVENT_ATTR(stalled-cycles-backend,     CMPLU_STALL);
+EVENT_ATTR(instructions,               INST_CMPL);
+EVENT_ATTR(cache-references,           LD_REF_L1);
+EVENT_ATTR(cache-misses,               LD_MISS_L1);
+EVENT_ATTR(branch-instructions,        BRU_FIN);
+EVENT_ATTR(branch-misses,              BRU_MPRED);
+
+static struct attribute *power7_events_attr[] = {
+	EVENT_PTR(CYC),
+	EVENT_PTR(GCT_NOSLOT_CYC),
+	EVENT_PTR(CMPLU_STALL),
+	EVENT_PTR(INST_CMPL),
+	EVENT_PTR(LD_REF_L1),
+	EVENT_PTR(LD_MISS_L1),
+	EVENT_PTR(BRU_FIN),
+	EVENT_PTR(BRU_MPRED),
+	NULL,
+};
+
+static struct attribute_group power7_pmu_events_group = {
+	.name = "events",
+	.attrs = power7_events_attr,           
+};
+
+static const struct attribute_group *power7_pmu_attr_groups[] = {
+	&power7_pmu_events_group,
+	NULL,
+};
+
 static struct power_pmu power7_pmu = {
 	.name			= "POWER7",
 	.n_counter		= 6,

@@ -371,6 +402,7 @@ static struct power_pmu power7_pmu = {
 	.get_alternatives	= power7_get_alternatives,
 	.disable_pmc		= power7_disable_pmc,
 	.flags			= PPMU_ALT_SIPR,
+	.attr_groups		= power7_pmu_attr_groups,
 	.n_generic		= ARRAY_SIZE(power7_generic_events),
 	.generic_events		= power7_generic_events,
 	.cache_events		= &power7_cache_events,

-- 
1.7.1

On Wed, Nov 07, 2012 at 11:19:28AM -0800, Sukadev Bhattiprolu wrote:

SNIP

+struct perf_pmu_events_attr {
+	struct device_attribute attr;
+	u64 id;
+};
+
+extern ssize_t power_events_sysfs_show(struct device *dev,
+				struct device_attribute *attr, char *page);
+
+#define EVENT_VAR(_id)	event_attr_##_id
+#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
+
+#define EVENT_ATTR(_name, _id)                                             \
+	static struct perf_pmu_events_attr EVENT_VAR(_id) = {              \
+		.attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
+		.id   = PM_##_id,                                               \
+	};

this is duplicating the x86 code, perhaps it could be moved
to include/linux/perf_event.h and shared globaly

whitespace issues


jirka

Jiri Olsa [jolsa@redhat.com] wrote:
| On Wed, Nov 07, 2012 at 11:19:28AM -0800, Sukadev Bhattiprolu wrote:
| 
| SNIP
| 
| > +struct perf_pmu_events_attr {
| > +	struct device_attribute attr;
| > +	u64 id;
| > +};
| > +
| > +extern ssize_t power_events_sysfs_show(struct device *dev,
| > +				struct device_attribute *attr, char *page);
| > +
| > +#define EVENT_VAR(_id)	event_attr_##_id
| > +#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
| > +
| > +#define EVENT_ATTR(_name, _id)                                             \
| > +	static struct perf_pmu_events_attr EVENT_VAR(_id) = {              \
| > +		.attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
| > +		.id   = PM_##_id,                                               \
| > +	};
| 
| this is duplicating the x86 code, perhaps it could be moved
| to include/linux/perf_event.h and shared globaly

Ok.

Can we remove the assumption that the event id is a generic event that
has PERF_COUNT_HW_ prefix and also let the architectures pass in a "show"
function ? This would allow architectures to display any arch specific
events that don't yet have a generic counterpart.

IOW, can we do something like this (untested) and make PERF_EVENT_ATTR global:

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 4428fd1..25298f7 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c

@@ -1354,12 +1354,15 @@ static ssize_t events_sysfs_show(struct device *dev, struct device_attribute *at
 #define EVENT_VAR(_id)  event_attr_##_id
 #define EVENT_PTR(_id) &event_attr_##_id.attr.attr

-#define EVENT_ATTR(_name, _id)                                 \
+#define PERF_EVENT_ATTR(_name, _id, _show)                     \
 static struct perf_pmu_events_attr EVENT_VAR(_id) = {          \
-       .attr = __ATTR(_name, 0444, events_sysfs_show, NULL),   \
-       .id   =  PERF_COUNT_HW_##_id,                           \
+       .attr = __ATTR(_name, 0444, _show, NULL),               \
+       .id   =  _id,                                           \
 };

+#define EVENT_ATTR(_name, _id)                                         \
+       PERF_EVENT_ATTR(_name, PERF_COUNT_HW_##_id, events_sysfs_show)
+
 EVENT_ATTR(cpu-cycles,                 CPU_CYCLES              );
 EVENT_ATTR(instructions,               INSTRUCTIONS            );
 EVENT_ATTR(cache-references,           CACHE_REFERENCES        );

| 
| 
| > diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
| > index aa2465e..19b23bd 100644
| > --- a/arch/powerpc/perf/core-book3s.c
| > +++ b/arch/powerpc/perf/core-book3s.c
| > @@ -1305,6 +1305,16 @@ static int power_pmu_event_idx(struct perf_event *event)
| >  	return event->hw.idx;
| >  }
| >  
| > +ssize_t power_events_sysfs_show(struct device *dev,
| > +				struct device_attribute *attr, char *page)
| > +{
| > +       struct perf_pmu_events_attr *pmu_attr;
| > +       
| > +       pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
| > +        
| > +       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
| 
| whitespace issues

Will fix. Thanks for the review.

Sukadev

On Wed, Nov 14, 2012 at 10:20:45AM -0800, Sukadev Bhattiprolu wrote:

Jiri Olsa [jolsa@redhat.com] wrote:
| On Wed, Nov 07, 2012 at 11:19:28AM -0800, Sukadev Bhattiprolu wrote:
| 
| SNIP
| 
| > +struct perf_pmu_events_attr {
| > +	struct device_attribute attr;
| > +	u64 id;
| > +};
| > +
| > +extern ssize_t power_events_sysfs_show(struct device *dev,
| > +				struct device_attribute *attr, char *page);
| > +
| > +#define EVENT_VAR(_id)	event_attr_##_id
| > +#define EVENT_PTR(_id) &event_attr_##_id.attr.attr
| > +
| > +#define EVENT_ATTR(_name, _id)                                             \
| > +	static struct perf_pmu_events_attr EVENT_VAR(_id) = {              \
| > +		.attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
| > +		.id   = PM_##_id,                                               \
| > +	};
| 
| this is duplicating the x86 code, perhaps it could be moved
| to include/linux/perf_event.h and shared globaly

Ok.

Can we remove the assumption that the event id is a generic event that
has PERF_COUNT_HW_ prefix and also let the architectures pass in a "show"
function ? This would allow architectures to display any arch specific
events that don't yet have a generic counterpart.

IOW, can we do something like this (untested) and make PERF_EVENT_ATTR global:

hm, then you probably can use following:

http://www.spinics.net/lists/kernel/msg1434233.html
http://www.spinics.net/lists/kernel/msg1434235.html
http://www.spinics.net/lists/kernel/msg1434226.html

jirka

Jiri Olsa [jolsa@redhat.com] wrote:
| > 
| > Can we remove the assumption that the event id is a generic event that
| > has PERF_COUNT_HW_ prefix and also let the architectures pass in a "show"
| > function ? This would allow architectures to display any arch specific
| > events that don't yet have a generic counterpart.
| > 
| > IOW, can we do something like this (untested) and make PERF_EVENT_ATTR global:
| 
| hm, then you probably can use following:
| 
| http://www.spinics.net/lists/kernel/msg1434233.html

For now, power events can simply be u64 - so am hoping to have something
like this and replace the raw codes:

#define PM_CYC			0x1e
#define PM_GCT_NOSLOT_CYC	0x100f8

EVENT_ATTR_STR() is interesting, but would require new/extra macros like

#define PM_CYC_STR		"0x1e"
#define PM_GCT_NOSLOT_CYC_STR	"0x100f8"

I went down the path we discussed earlier - to have x86 and Power share
the EVENT_ATTR() macros. This is making the x86 code less concise

	EVENT_ATTR(cpu-cycles,	CPU_CYCLES)

becomes

	EVENT_ATTR(cpu-cycles,	PERF_COUNT_HW_CPU_CYCLES, events_sysfs_show)

with each EVENT_ATTR() explcitly adding events_sysfs_show or needing another
wrapper around the wrappers.

Still tweaking it, but would it be flexible to make 'struct pmu_events_attr'
common and let architectures define the EVENT_ATTR() as needed ? Would
duplicate some code but hopefully not a lot.

Sukadev

On Fri, Nov 16, 2012 at 11:35:37AM -0800, Sukadev Bhattiprolu wrote:

Jiri Olsa [jolsa@redhat.com] wrote:
| > 
| > Can we remove the assumption that the event id is a generic event that
| > has PERF_COUNT_HW_ prefix and also let the architectures pass in a "show"
| > function ? This would allow architectures to display any arch specific
| > events that don't yet have a generic counterpart.
| > 
| > IOW, can we do something like this (untested) and make PERF_EVENT_ATTR global:
| 
| hm, then you probably can use following:
| 
| http://www.spinics.net/lists/kernel/msg1434233.html

For now, power events can simply be u64 - so am hoping to have something
like this and replace the raw codes:

#define PM_CYC			0x1e
#define PM_GCT_NOSLOT_CYC	0x100f8

EVENT_ATTR_STR() is interesting, but would require new/extra macros like

#define PM_CYC_STR		"0x1e"
#define PM_GCT_NOSLOT_CYC_STR	"0x100f8"

I went down the path we discussed earlier - to have x86 and Power share
the EVENT_ATTR() macros. This is making the x86 code less concise

	EVENT_ATTR(cpu-cycles,	CPU_CYCLES)

becomes

	EVENT_ATTR(cpu-cycles,	PERF_COUNT_HW_CPU_CYCLES, events_sysfs_show)

with each EVENT_ATTR() explcitly adding events_sysfs_show or needing another
wrapper around the wrappers.

Still tweaking it, but would it be flexible to make 'struct pmu_events_attr'
common and let architectures define the EVENT_ATTR() as needed ? Would
duplicate some code but hopefully not a lot.

sounds good, let's see ;)

jirka

From bafc551c31ce23c1cba0b75d23de6c46aba90f26 Mon Sep 17 00:00:00 2001

From: Sukadev Bhattiprolu <redacted>
Date: Tue, 6 Nov 2012 16:30:28 -0800
Subject: [PATCH 4/4] perf: Create a sysfs entry for Power event format

Create a sysfs entry, '/sys/bus/event_source/devices/cpu/format/event'
which describes the format of a POWER cpu.

	$ cat /sys/bus/event_source/devices/cpu/format/event
	config:0-20

The format of the event is the same for all POWER cpus, so bulk of this
change is in the code common to POWER cpus.

Signed-off-by: Sukadev Bhattiprolu <redacted>
---
 arch/powerpc/include/asm/perf_event_server.h |    8 ++++++++
 arch/powerpc/perf/core-book3s.c              |   19 +++++++++++++++++++
 arch/powerpc/perf/power7-pmu.c               |    1 +
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index ad84f73..20a49bf 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h

@@ -130,3 +130,11 @@ extern ssize_t power_events_sysfs_show(struct device *dev,
 		.attr = __ATTR(_name, 0444, power_events_sysfs_show, NULL),\
 		.id   = PM_##_id,                                               \
 	};
+
+/*
+ * Format of a perf event is the same on all POWER cpus. Declare a
+ * common sysfs attribute group that individual POWER cpus can share.
+ */
+extern struct attribute_group power_pmu_format_group;
+
+

diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 19b23bd..388e2a1 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c

@@ -1315,6 +1315,25 @@ ssize_t power_events_sysfs_show(struct device *dev,
        return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
+static ssize_t power_config_sysfs_show(struct device *dev,
+				struct device_attribute *attr, char *page)
+{
+	return sprintf(page, "config:0-20\n");
+}
+
+static struct device_attribute config_dev_attr = \
+			__ATTR(event, 0444, power_config_sysfs_show, NULL);
+
+static struct attribute *power_pmu_format_attr[] = {
+	&config_dev_attr.attr,
+	NULL,
+};
+
+struct attribute_group power_pmu_format_group = {
+	.name = "format",
+	.attrs = power_pmu_format_attr,
+};
+
 struct pmu power_pmu = {
 	.pmu_enable	= power_pmu_enable,
 	.pmu_disable	= power_pmu_disable,

diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c
index 31c61ab..aa9f588 100644
--- a/arch/powerpc/perf/power7-pmu.c
+++ b/arch/powerpc/perf/power7-pmu.c

@@ -387,6 +387,7 @@ static struct attribute_group power7_pmu_events_group = {
 };
 
 static const struct attribute_group *power7_pmu_attr_groups[] = {
+	&power_pmu_format_group,
 	&power7_pmu_events_group,
 	NULL,
 };

-- 
1.7.1

On Wed, Nov 07, 2012 at 11:19:52AM -0800, Sukadev Bhattiprolu wrote:

there's PMU_FORMAT_ATTR in include/linux/perf_event.h macro doing this

jirka

On 11/08/2012 12:48 AM, Sukadev Bhattiprolu wrote:

 From b8beef080260c1625c8f801105504a82005295e5 Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <redacted>
Date: Wed, 31 Oct 2012 11:21:28 -0700
Subject: [PATCH 1/4] perf/powerpc: Use uapi/unistd.h to fix build error

Use the 'unistd.h' from arch/powerpc/include/uapi to build the perf tool.

Signed-off-by: Sukadev Bhattiprolu <redacted>

Without this patch, I couldn't build perf on powerpc, with 3.7.0-rc2

Tested-by: Suzuki K. Poulose <redacted>

Thanks
Suzuki