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powerpc/perf: Export PERF_EVENT_CONFIG_EBB_SHIFT to userspace 

We use bit 63 of the event code for userspace to request that the event
be counted using EBB (Event Based Branches). Export this value, making
it part of the API - though only on processors that support EBB.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Michael Ellerman 2013-07-23 18:07:45 +10:00 committed by Benjamin Herrenschmidt
parent e8e813ed26
commit 8d7c55d01e
5 changed files with 24 additions and 9 deletions
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6
arch/powerpc/include/asm/perf_event_server.h
View File

@ -12,6 +12,7 @@
#include <linux/types.h>
#include <asm/hw_irq.h>
#include <linux/device.h>
#include <uapi/asm/perf_event.h>
#define MAX_HWEVENTS 8
#define MAX_EVENT_ALTERNATIVES 8
@ -69,11 +70,6 @@ struct power_pmu {
#define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
#define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
/*
* We use the event config bit 63 as a flag to request EBB.
*/
#define EVENT_CONFIG_EBB_SHIFT 63
extern int register_power_pmu(struct power_pmu *);
struct pt_regs;

1
arch/powerpc/include/uapi/asm/Kbuild
View File

@ -20,6 +20,7 @@ header-y += mman.h
header-y += msgbuf.h
header-y += nvram.h
header-y += param.h
header-y += perf_event.h
header-y += poll.h
header-y += posix_types.h
header-y += ps3fb.h

18
arch/powerpc/include/uapi/asm/perf_event.h 100644
View File

@ -0,0 +1,18 @@
/*
* Copyright 2013 Michael Ellerman, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2 of the
* License.
*/
#ifndef _UAPI_ASM_POWERPC_PERF_EVENT_H
#define _UAPI_ASM_POWERPC_PERF_EVENT_H
/*
* We use bit 63 of perf_event_attr.config as a flag to request EBB.
*/
#define PERF_EVENT_CONFIG_EBB_SHIFT 63
#endif /* _UAPI_ASM_POWERPC_PERF_EVENT_H */

2
arch/powerpc/perf/core-book3s.c
View File

@ -484,7 +484,7 @@ static bool is_ebb_event(struct perf_event *event)
* use bit 63 of the event code for something else if they wish.
*/
return (ppmu->flags & PPMU_EBB) &&
((event->attr.config >> EVENT_CONFIG_EBB_SHIFT) & 1);
((event->attr.config >> PERF_EVENT_CONFIG_EBB_SHIFT) & 1);
}
static int ebb_event_check(struct perf_event *event)

6
arch/powerpc/perf/power8-pmu.c
View File

@ -118,7 +118,7 @@
(EVENT_UNIT_MASK << EVENT_UNIT_SHIFT) | \
(EVENT_COMBINE_MASK << EVENT_COMBINE_SHIFT) | \
(EVENT_MARKED_MASK << EVENT_MARKED_SHIFT) | \
(EVENT_EBB_MASK << EVENT_CONFIG_EBB_SHIFT) | \
(EVENT_EBB_MASK << PERF_EVENT_CONFIG_EBB_SHIFT) | \
EVENT_PSEL_MASK)
/* MMCRA IFM bits - POWER8 */
@ -233,10 +233,10 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long
pmc = (event >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
unit = (event >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK;
cache = (event >> EVENT_CACHE_SEL_SHIFT) & EVENT_CACHE_SEL_MASK;
ebb = (event >> EVENT_CONFIG_EBB_SHIFT) & EVENT_EBB_MASK;
ebb = (event >> PERF_EVENT_CONFIG_EBB_SHIFT) & EVENT_EBB_MASK;
/* Clear the EBB bit in the event, so event checks work below */
event &= ~(EVENT_EBB_MASK << EVENT_CONFIG_EBB_SHIFT);
event &= ~(EVENT_EBB_MASK << PERF_EVENT_CONFIG_EBB_SHIFT);
if (pmc) {
if (pmc > 6)