* [PATCH v7 3/6] MIPS: add support for software performance events
2010-09-30 9:09 [PATCH v7 0/6] MIPS performance event support v7 Deng-Cheng Zhu
2010-09-30 9:09 ` [PATCH v7 1/6] MIPS: define local_xchg from xchg_local to atomic_long_xchg Deng-Cheng Zhu
2010-09-30 9:09 ` [PATCH v7 2/6] MIPS/Oprofile: extract PMU defines for sharing Deng-Cheng Zhu
@ 2010-09-30 9:09 ` Deng-Cheng Zhu
2010-09-30 9:09 ` [PATCH v7 4/6] MIPS: add support for hardware performance events (skeleton) Deng-Cheng Zhu
` (3 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Deng-Cheng Zhu @ 2010-09-30 9:09 UTC (permalink / raw)
To: linux-mips, ralf
Cc: a.p.zijlstra, paulus, mingo, acme, jamie.iles, dengcheng.zhu
Software events are required as part of the measurable stuff by the
Linux performance counter subsystem. Here is the list of events added by
this patch:
PERF_COUNT_SW_PAGE_FAULTS
PERF_COUNT_SW_PAGE_FAULTS_MIN
PERF_COUNT_SW_PAGE_FAULTS_MAJ
PERF_COUNT_SW_ALIGNMENT_FAULTS
PERF_COUNT_SW_EMULATION_FAULTS
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
---
arch/mips/Kconfig | 2 ++
arch/mips/kernel/traps.c | 18 +++++++++++++++---
arch/mips/kernel/unaligned.c | 6 ++++++
arch/mips/math-emu/cp1emu.c | 3 +++
arch/mips/mm/fault.c | 11 +++++++++--
5 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 5526faa..ce54490 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -4,6 +4,8 @@ config MIPS
select HAVE_GENERIC_DMA_COHERENT
select HAVE_IDE
select HAVE_OPROFILE
+ select HAVE_PERF_EVENTS
+ select PERF_USE_VMALLOC
select HAVE_ARCH_KGDB
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 03ec001..45def62 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -28,6 +28,7 @@
#include <linux/kprobes.h>
#include <linux/notifier.h>
#include <linux/kdb.h>
+#include <linux/perf_event.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -576,10 +577,16 @@ static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)
*/
static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == LL)
+ if ((opcode & OPCODE) == LL) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_ll(regs, opcode);
- if ((opcode & OPCODE) == SC)
+ }
+ if ((opcode & OPCODE) == SC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_sc(regs, opcode);
+ }
return -1; /* Must be something else ... */
}
@@ -595,6 +602,8 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
int rd = (opcode & RD) >> 11;
int rt = (opcode & RT) >> 16;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
switch (rd) {
case 0: /* CPU number */
regs->regs[rt] = smp_processor_id();
@@ -630,8 +639,11 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC)
+ if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return 0;
+ }
return -1; /* Must be something else ... */
}
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 69b039c..f28a087 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -78,6 +78,8 @@
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
+
#include <asm/asm.h>
#include <asm/branch.h>
#include <asm/byteorder.h>
@@ -109,6 +111,8 @@ static void emulate_load_store_insn(struct pt_regs *regs,
unsigned long value;
unsigned int res;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
regs->regs[0] = 0;
/*
@@ -513,6 +517,8 @@ asmlinkage void do_ade(struct pt_regs *regs)
unsigned int __user *pc;
mm_segment_t seg;
+ perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
+ 1, 0, regs, regs->cp0_badvaddr);
/*
* Did we catch a fault trying to load an instruction?
* Or are we running in MIPS16 mode?
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 47842b7..fd180ea 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -37,6 +37,7 @@
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
#include <asm/inst.h>
#include <asm/bootinfo.h>
@@ -259,6 +260,8 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
}
emul:
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, xcp, 0);
MIPS_FPU_EMU_INC_STATS(emulated);
switch (MIPSInst_OPCODE(ir)) {
case ldc1_op:{
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 783ad00..137ee76 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -18,6 +18,7 @@
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/kprobes.h>
+#include <linux/perf_event.h>
#include <asm/branch.h>
#include <asm/mmu_context.h>
@@ -144,6 +145,7 @@ good_area:
* the fault.
*/
fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@@ -151,10 +153,15 @@ good_area:
goto do_sigbus;
BUG();
}
- if (fault & VM_FAULT_MAJOR)
+ if (fault & VM_FAULT_MAJOR) {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
+ 1, 0, regs, address);
tsk->maj_flt++;
- else
+ } else {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
+ 1, 0, regs, address);
tsk->min_flt++;
+ }
up_read(&mm->mmap_sem);
return;
--
1.7.0.4
^ permalink raw reply related [flat|nested] 13+ messages in thread* [PATCH v7 4/6] MIPS: add support for hardware performance events (skeleton)
2010-09-30 9:09 [PATCH v7 0/6] MIPS performance event support v7 Deng-Cheng Zhu
` (2 preceding siblings ...)
2010-09-30 9:09 ` [PATCH v7 3/6] MIPS: add support for software performance events Deng-Cheng Zhu
@ 2010-09-30 9:09 ` Deng-Cheng Zhu
2010-09-30 9:09 ` [PATCH v7 5/6] MIPS/Perf-events: add callchain support Deng-Cheng Zhu
` (2 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Deng-Cheng Zhu @ 2010-09-30 9:09 UTC (permalink / raw)
To: linux-mips, ralf
Cc: a.p.zijlstra, paulus, mingo, acme, jamie.iles, dengcheng.zhu
This patch provides the skeleton of the HW perf event support. To enable
this feature, we can not choose the SMTC kernel; Oprofile should be
disabled; kernel performance events be selected. Then we can enable it in
Kernel type menu.
Oprofile for MIPS platforms initializes irq at arch init time. Currently
we do not change this logic to allow PMU reservation.
If a platform has EIC, we can use the irq base and perf counter irq offset
defines for the interrupt controller in specific init_hw_perf_events().
Based on this skeleton patch, the 3 different kinds of MIPS PMU, namely,
mipsxx/loongson2/rm9000, can be supported by adding corresponding lower
level C files at the bottom. The suggested names of these files are
perf_event_mipsxx.c/perf_event_loongson2.c/perf_event_rm9000.c. So, for
example, we can do this by adding "#include perf_event_mipsxx.c" at the
bottom of perf_event.c.
In addition, PMUs with 64bit counters are also considered in this patch.
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
---
arch/mips/Kconfig | 8 +
arch/mips/include/asm/perf_event.h | 25 ++
arch/mips/include/asm/pmu.h | 3 +
arch/mips/kernel/Makefile | 2 +
arch/mips/kernel/perf_event.c | 487 ++++++++++++++++++++++++++++++++++++
5 files changed, 527 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/include/asm/perf_event.h
create mode 100644 arch/mips/kernel/perf_event.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ce54490..693ef46 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1928,6 +1928,14 @@ config NODES_SHIFT
default "6"
depends on NEED_MULTIPLE_NODES
+config HW_PERF_EVENTS
+ bool "Enable hardware performance counter support for perf events"
+ depends on PERF_EVENTS && !MIPS_MT_SMTC && OPROFILE=n && CPU_MIPS32
+ default y
+ help
+ Enable hardware performance counter support for perf events. If
+ disabled, perf events will use software events only.
+
source "mm/Kconfig"
config SMP
diff --git a/arch/mips/include/asm/perf_event.h b/arch/mips/include/asm/perf_event.h
new file mode 100644
index 0000000..e00007c
--- /dev/null
+++ b/arch/mips/include/asm/perf_event.h
@@ -0,0 +1,25 @@
+/*
+ * linux/arch/mips/include/asm/perf_event.h
+ *
+ * Copyright (C) 2010 MIPS Technologies, Inc.
+ * Author: Deng-Cheng Zhu
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __MIPS_PERF_EVENT_H__
+#define __MIPS_PERF_EVENT_H__
+
+/*
+ * MIPS performance counters do not raise NMI upon overflow, a regular
+ * interrupt will be signaled. Hence we can do the pending perf event
+ * work at the tail of the irq handler.
+ */
+static inline void
+set_perf_event_pending(void)
+{
+}
+
+#endif /* __MIPS_PERF_EVENT_H__ */
diff --git a/arch/mips/include/asm/pmu.h b/arch/mips/include/asm/pmu.h
index 8d39c90..ed266f7 100644
--- a/arch/mips/include/asm/pmu.h
+++ b/arch/mips/include/asm/pmu.h
@@ -20,6 +20,9 @@
#ifndef __MIPS_PMU_H__
#define __MIPS_PMU_H__
+/* Used by Perf-events */
+#define MIPS_MAX_HWEVENTS 4
+
/* mipsxx */
#define M_CONFIG1_PC (1 << 4)
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 06f8482..9792275 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -102,4 +102,6 @@ obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT) += 8250-platform.o
obj-$(CONFIG_MIPS_CPUFREQ) += cpufreq/
+obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
+
CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS)
diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c
new file mode 100644
index 0000000..e7b1934
--- /dev/null
+++ b/arch/mips/kernel/perf_event.c
@@ -0,0 +1,487 @@
+/*
+ * Linux performance counter support for MIPS.
+ *
+ * Copyright (C) 2010 MIPS Technologies, Inc.
+ * Author: Deng-Cheng Zhu
+ *
+ * This code is based on the implementation for ARM, which is in turn
+ * based on the sparc64 perf event code and the x86 code. Performance
+ * counter access is based on the MIPS Oprofile code.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/cpumask.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/perf_event.h>
+#include <linux/uaccess.h>
+
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/stacktrace.h>
+#include <asm/time.h> /* For perf_irq */
+#include <asm/pmu.h>
+
+/* These are for 32bit counters. For 64bit ones, define them accordingly. */
+#define MAX_PERIOD ((1ULL << 32) - 1)
+#define VALID_COUNT 0x7fffffff
+#define TOTAL_BITS 32
+#define HIGHEST_BIT 31
+
+struct cpu_hw_events {
+ /* Array of events on this cpu. */
+ struct perf_event *events[MIPS_MAX_HWEVENTS];
+
+ /*
+ * Set the bit (indexed by the counter number) when the counter
+ * is used for an event.
+ */
+ unsigned long used_mask[BITS_TO_LONGS(MIPS_MAX_HWEVENTS)];
+
+ /*
+ * The borrowed MSB for the performance counter. A MIPS performance
+ * counter uses its bit 31 (for 32bit counters) or bit 63 (for 64bit
+ * counters) as a factor of determining whether a counter overflow
+ * should be signaled. So here we use a separate MSB for each
+ * counter to make things easy.
+ */
+ unsigned long msbs[BITS_TO_LONGS(MIPS_MAX_HWEVENTS)];
+
+ /*
+ * Software copy of the control register for each performance counter.
+ * MIPS CPUs vary in performance counters. They use this differently,
+ * and even may not use it.
+ */
+ unsigned int saved_ctrl[MIPS_MAX_HWEVENTS];
+};
+DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = {
+ .saved_ctrl = {0},
+};
+
+/* The description of MIPS performance events. */
+struct mips_perf_event {
+ unsigned int event_id;
+ /*
+ * MIPS performance counters are indexed starting from 0.
+ * CNTR_EVEN indicates the indexes of the counters to be used are
+ * even numbers.
+ */
+ unsigned int cntr_mask;
+ #define CNTR_EVEN 0x55555555
+ #define CNTR_ODD 0xaaaaaaaa
+#ifdef CONFIG_MIPS_MT_SMP
+ enum {
+ T = 0,
+ V = 1,
+ P = 2,
+ } range;
+#else
+ #define T
+ #define V
+ #define P
+#endif
+};
+
+#define UNSUPPORTED_PERF_EVENT_ID 0xffffffff
+#define C(x) PERF_COUNT_HW_CACHE_##x
+
+struct mips_pmu {
+ const char *name;
+ int irq;
+ irqreturn_t (*handle_irq)(int irq, void *dev);
+ int (*handle_shared_irq)(void);
+ void (*start)(void);
+ void (*stop)(void);
+ int (*alloc_counter)(struct cpu_hw_events *cpuc,
+ struct hw_perf_event *hwc);
+ u64 (*read_counter)(unsigned int idx);
+ void (*write_counter)(unsigned int idx, u64 val);
+ void (*enable_event)(struct hw_perf_event *evt, int idx);
+ void (*disable_event)(int idx);
+ const struct mips_perf_event (*general_event_map)[PERF_COUNT_HW_MAX];
+ const struct mips_perf_event (*cache_event_map)
+ [PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX];
+ unsigned int num_counters;
+};
+
+static const struct mips_pmu *mipspmu;
+
+static int
+mipspmu_event_set_period(struct perf_event *event,
+ struct hw_perf_event *hwc,
+ int idx)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ s64 left = local64_read(&hwc->period_left);
+ s64 period = hwc->sample_period;
+ int ret = 0;
+ u64 uleft;
+ unsigned long flags;
+
+ if (unlikely(left <= -period)) {
+ left = period;
+ local64_set(&hwc->period_left, left);
+ hwc->last_period = period;
+ ret = 1;
+ }
+
+ if (unlikely(left <= 0)) {
+ left += period;
+ local64_set(&hwc->period_left, left);
+ hwc->last_period = period;
+ ret = 1;
+ }
+
+ if (left > (s64)MAX_PERIOD)
+ left = MAX_PERIOD;
+
+ local64_set(&hwc->prev_count, (u64)-left);
+
+ local_irq_save(flags);
+ uleft = (u64)(-left) & MAX_PERIOD;
+ uleft > VALID_COUNT ?
+ set_bit(idx, cpuc->msbs) : clear_bit(idx, cpuc->msbs);
+ mipspmu->write_counter(idx, (u64)(-left) & VALID_COUNT);
+ local_irq_restore(flags);
+
+ perf_event_update_userpage(event);
+
+ return ret;
+}
+
+static int mipspmu_enable(struct perf_event *event)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ struct hw_perf_event *hwc = &event->hw;
+ int idx;
+ int err = 0;
+
+ /* To look for a free counter for this event. */
+ idx = mipspmu->alloc_counter(cpuc, hwc);
+ if (idx < 0) {
+ err = idx;
+ goto out;
+ }
+
+ /*
+ * If there is an event in the counter we are going to use then
+ * make sure it is disabled.
+ */
+ event->hw.idx = idx;
+ mipspmu->disable_event(idx);
+ cpuc->events[idx] = event;
+
+ /* Set the period for the event. */
+ mipspmu_event_set_period(event, hwc, idx);
+
+ /* Enable the event. */
+ mipspmu->enable_event(hwc, idx);
+
+ /* Propagate our changes to the userspace mapping. */
+ perf_event_update_userpage(event);
+
+out:
+ return err;
+}
+
+static void mipspmu_event_update(struct perf_event *event,
+ struct hw_perf_event *hwc,
+ int idx)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ unsigned long flags;
+ int shift = 64 - TOTAL_BITS;
+ s64 prev_raw_count, new_raw_count;
+ s64 delta;
+
+again:
+ prev_raw_count = local64_read(&hwc->prev_count);
+ local_irq_save(flags);
+ /* Make the counter value be a "real" one. */
+ new_raw_count = mipspmu->read_counter(idx);
+ if (new_raw_count & (test_bit(idx, cpuc->msbs) << HIGHEST_BIT)) {
+ new_raw_count &= VALID_COUNT;
+ clear_bit(idx, cpuc->msbs);
+ } else
+ new_raw_count |= (test_bit(idx, cpuc->msbs) << HIGHEST_BIT);
+ local_irq_restore(flags);
+
+ if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
+ new_raw_count) != prev_raw_count)
+ goto again;
+
+ delta = (new_raw_count << shift) - (prev_raw_count << shift);
+ delta >>= shift;
+
+ local64_add(delta, &event->count);
+ local64_sub(delta, &hwc->period_left);
+
+ return;
+}
+
+static void mipspmu_disable(struct perf_event *event)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ struct hw_perf_event *hwc = &event->hw;
+ int idx = hwc->idx;
+
+
+ WARN_ON(idx < 0 || idx >= mipspmu->num_counters);
+
+ /* We are working on a local event. */
+ mipspmu->disable_event(idx);
+
+ barrier();
+
+ mipspmu_event_update(event, hwc, idx);
+ cpuc->events[idx] = NULL;
+ clear_bit(idx, cpuc->used_mask);
+
+ perf_event_update_userpage(event);
+}
+
+static void mipspmu_unthrottle(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ mipspmu->enable_event(hwc, hwc->idx);
+}
+
+static void mipspmu_read(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ /* Don't read disabled counters! */
+ if (hwc->idx < 0)
+ return;
+
+ mipspmu_event_update(event, hwc, hwc->idx);
+}
+
+static struct pmu pmu = {
+ .enable = mipspmu_enable,
+ .disable = mipspmu_disable,
+ .unthrottle = mipspmu_unthrottle,
+ .read = mipspmu_read,
+};
+
+static atomic_t active_events = ATOMIC_INIT(0);
+static DEFINE_MUTEX(pmu_reserve_mutex);
+static int (*save_perf_irq)(void);
+
+static int mipspmu_get_irq(void)
+{
+ int err;
+
+ if (mipspmu->irq >= 0) {
+ /* Request my own irq handler. */
+ err = request_irq(mipspmu->irq, mipspmu->handle_irq,
+ IRQF_DISABLED | IRQF_NOBALANCING,
+ "mips_perf_pmu", NULL);
+ if (err) {
+ pr_warning("Unable to request IRQ%d for MIPS "
+ "performance counters!\n", mipspmu->irq);
+ }
+ } else if (cp0_perfcount_irq < 0) {
+ /*
+ * We are sharing the irq number with the timer interrupt.
+ */
+ save_perf_irq = perf_irq;
+ perf_irq = mipspmu->handle_shared_irq;
+ err = 0;
+ } else {
+ pr_warning("The platform hasn't properly defined its "
+ "interrupt controller.\n");
+ err = -ENOENT;
+ }
+
+ return err;
+}
+
+static void mipspmu_free_irq(void)
+{
+ if (mipspmu->irq >= 0)
+ free_irq(mipspmu->irq, NULL);
+ else if (cp0_perfcount_irq < 0)
+ perf_irq = save_perf_irq;
+}
+
+static inline unsigned int
+mipspmu_perf_event_encode(const struct mips_perf_event *pev)
+{
+/*
+ * Top 8 bits for range, next 16 bits for cntr_mask, lowest 8 bits for
+ * event_id.
+ */
+#ifdef CONFIG_MIPS_MT_SMP
+ return ((unsigned int)pev->range << 24) |
+ (pev->cntr_mask & 0xffff00) |
+ (pev->event_id & 0xff);
+#else
+ return (pev->cntr_mask & 0xffff00) |
+ (pev->event_id & 0xff);
+#endif
+}
+
+static const struct mips_perf_event *
+mipspmu_map_general_event(int idx)
+{
+ const struct mips_perf_event *pev;
+
+ pev = ((*mipspmu->general_event_map)[idx].event_id ==
+ UNSUPPORTED_PERF_EVENT_ID ? ERR_PTR(-EOPNOTSUPP) :
+ &(*mipspmu->general_event_map)[idx]);
+
+ return pev;
+}
+
+static const struct mips_perf_event *
+mipspmu_map_cache_event(u64 config)
+{
+ unsigned int cache_type, cache_op, cache_result;
+ const struct mips_perf_event *pev;
+
+ cache_type = (config >> 0) & 0xff;
+ if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
+ return ERR_PTR(-EINVAL);
+
+ cache_op = (config >> 8) & 0xff;
+ if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
+ return ERR_PTR(-EINVAL);
+
+ cache_result = (config >> 16) & 0xff;
+ if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+ return ERR_PTR(-EINVAL);
+
+ pev = &((*mipspmu->cache_event_map)
+ [cache_type]
+ [cache_op]
+ [cache_result]);
+
+ if (pev->event_id == UNSUPPORTED_PERF_EVENT_ID)
+ return ERR_PTR(-EOPNOTSUPP);
+
+ return pev;
+
+}
+
+static int validate_event(struct cpu_hw_events *cpuc,
+ struct perf_event *event)
+{
+ struct hw_perf_event fake_hwc = event->hw;
+
+ if (event->pmu && event->pmu != &pmu)
+ return 0;
+
+ return mipspmu->alloc_counter(cpuc, &fake_hwc) >= 0;
+}
+
+static int validate_group(struct perf_event *event)
+{
+ struct perf_event *sibling, *leader = event->group_leader;
+ struct cpu_hw_events fake_cpuc;
+
+ memset(&fake_cpuc, 0, sizeof(fake_cpuc));
+
+ if (!validate_event(&fake_cpuc, leader))
+ return -ENOSPC;
+
+ list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
+ if (!validate_event(&fake_cpuc, sibling))
+ return -ENOSPC;
+ }
+
+ if (!validate_event(&fake_cpuc, event))
+ return -ENOSPC;
+
+ return 0;
+}
+
+/*
+ * mipsxx/rm9000/loongson2 have different performance counters, they have
+ * specific low-level init routines.
+ */
+static int __hw_perf_event_init(struct perf_event *event);
+
+static void hw_perf_event_destroy(struct perf_event *event)
+{
+ if (atomic_dec_and_mutex_lock(&active_events,
+ &pmu_reserve_mutex)) {
+ /*
+ * We must not call the destroy function with interrupts
+ * disabled.
+ */
+ on_each_cpu(reset_counters,
+ (void *)(long)mipspmu->num_counters, 1);
+ mipspmu_free_irq();
+ mutex_unlock(&pmu_reserve_mutex);
+ }
+}
+
+const struct pmu *hw_perf_event_init(struct perf_event *event)
+{
+ int err = 0;
+
+ if (!mipspmu || event->cpu >= nr_cpumask_bits ||
+ (event->cpu >= 0 && !cpu_online(event->cpu)))
+ return ERR_PTR(-ENODEV);
+
+ if (!atomic_inc_not_zero(&active_events)) {
+ if (atomic_read(&active_events) > MIPS_MAX_HWEVENTS) {
+ atomic_dec(&active_events);
+ return ERR_PTR(-ENOSPC);
+ }
+
+ mutex_lock(&pmu_reserve_mutex);
+ if (atomic_read(&active_events) == 0)
+ err = mipspmu_get_irq();
+
+ if (!err)
+ atomic_inc(&active_events);
+ mutex_unlock(&pmu_reserve_mutex);
+ }
+
+ if (err)
+ return ERR_PTR(err);
+
+ err = __hw_perf_event_init(event);
+ if (err)
+ hw_perf_event_destroy(event);
+
+ return err ? ERR_PTR(err) : &pmu;
+}
+
+void hw_perf_enable(void)
+{
+ if (mipspmu)
+ mipspmu->start();
+}
+
+void hw_perf_disable(void)
+{
+ if (mipspmu)
+ mipspmu->stop();
+}
+
+/* This is needed by specific irq handlers in perf_event_*.c */
+static void
+handle_associated_event(struct cpu_hw_events *cpuc,
+ int idx, struct perf_sample_data *data, struct pt_regs *regs)
+{
+ struct perf_event *event = cpuc->events[idx];
+ struct hw_perf_event *hwc = &event->hw;
+
+ mipspmu_event_update(event, hwc, idx);
+ data->period = event->hw.last_period;
+ if (!mipspmu_event_set_period(event, hwc, idx))
+ return;
+
+ if (perf_event_overflow(event, 0, data, regs))
+ mipspmu->disable_event(idx);
+}
--
1.7.0.4
^ permalink raw reply related [flat|nested] 13+ messages in thread* [PATCH v7 6/6] MIPS: add support for hardware performance events (mipsxx)
2010-09-30 9:09 [PATCH v7 0/6] MIPS performance event support v7 Deng-Cheng Zhu
` (4 preceding siblings ...)
2010-09-30 9:09 ` [PATCH v7 5/6] MIPS/Perf-events: add callchain support Deng-Cheng Zhu
@ 2010-09-30 9:09 ` Deng-Cheng Zhu
2010-09-30 9:26 ` Ingo Molnar
2010-10-04 19:33 ` [PATCH v7 0/6] MIPS performance event support v7 Matt Fleming
6 siblings, 1 reply; 13+ messages in thread
From: Deng-Cheng Zhu @ 2010-09-30 9:09 UTC (permalink / raw)
To: linux-mips, ralf
Cc: a.p.zijlstra, paulus, mingo, acme, jamie.iles, dengcheng.zhu
This patch adds the mipsxx Perf-event support based on the skeleton.
Generic hardware events and cache events are now fully implemented for
the 24K/34K/74K/1004K cores. To support other cores in mipsxx (such as
R10000/SB1), the generic hardware event tables and cache event tables
need to be filled out. To support other CPUs which have different PMU
than mipsxx, such as RM9000 and LOONGSON2, the additional files
perf_event_$cpu.c need to be created.
Raw event is an important part of Perf-events. It helps the user collect
performance data for events that are not listed as the generic hardware
events and cache events but ARE supported by the CPU's PMU.
This patch also adds this feature for mipsxx 24K/34K/74K/1004K. For how to
use it, please refer to processor core software user's manual and the
comments for mipsxx_pmu_map_raw_event() for more details.
Please note that this is a "precise" implementation, which means the
kernel will check whether the requested raw events are supported by this
CPU and which hardware counters can be assigned for them.
To test the functionality of Perf-event, you may want to compile the tool
"perf" for your MIPS platform. You can refer to the following URL:
http://www.linux-mips.org/archives/linux-mips/2010-04/msg00158.html
Please note: Before that patch is accepted, you can choose a "specific"
rmb() which is suitable for your platform -- an example is provided in
the description of that patch.
You also need to customize the CFLAGS and LDFLAGS in tools/perf/Makefile
for your libs, includes, etc.
In case you encounter the boot failure in SMVP kernel on multi-threading
CPUs, you may take a look at:
http://www.linux-mips.org/git?p=linux-mti.git;a=commitdiff;h=5460815027d802697b879644c74f0e8365254020
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
---
arch/mips/include/asm/pmu.h | 13 +
arch/mips/kernel/perf_event.c | 7 +
arch/mips/kernel/perf_event_mipsxx.c | 1020 ++++++++++++++++++++++++++++++++++
3 files changed, 1040 insertions(+), 2 deletions(-)
create mode 100644 arch/mips/kernel/perf_event_mipsxx.c
diff --git a/arch/mips/include/asm/pmu.h b/arch/mips/include/asm/pmu.h
index ed266f7..f004525 100644
--- a/arch/mips/include/asm/pmu.h
+++ b/arch/mips/include/asm/pmu.h
@@ -41,6 +41,19 @@
#define M_PERFCTL_WIDE (1UL << 30)
#define M_PERFCTL_MORE (1UL << 31)
+#define M_PERFCTL_COUNT_EVENT_WHENEVER (M_PERFCTL_EXL | \
+ M_PERFCTL_KERNEL | \
+ M_PERFCTL_USER | \
+ M_PERFCTL_SUPERVISOR | \
+ M_PERFCTL_INTERRUPT_ENABLE)
+
+#ifdef CONFIG_MIPS_MT_SMP
+#define M_PERFCTL_CONFIG_MASK 0x3fff801f
+#else
+#define M_PERFCTL_CONFIG_MASK 0x1f
+#endif
+#define M_PERFCTL_EVENT_MASK 0xfe0
+
#define M_COUNTER_OVERFLOW (1UL << 31)
/* rm9000 */
diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c
index b3ffe44..fdf5f23 100644
--- a/arch/mips/kernel/perf_event.c
+++ b/arch/mips/kernel/perf_event.c
@@ -87,6 +87,9 @@ struct mips_perf_event {
#endif
};
+static struct mips_perf_event raw_event;
+static DEFINE_MUTEX(raw_event_mutex);
+
#define UNSUPPORTED_PERF_EVENT_ID 0xffffffff
#define C(x) PERF_COUNT_HW_CACHE_##x
@@ -103,6 +106,7 @@ struct mips_pmu {
void (*write_counter)(unsigned int idx, u64 val);
void (*enable_event)(struct hw_perf_event *evt, int idx);
void (*disable_event)(int idx);
+ const struct mips_perf_event *(*map_raw_event)(u64 config);
const struct mips_perf_event (*general_event_map)[PERF_COUNT_HW_MAX];
const struct mips_perf_event (*cache_event_map)
[PERF_COUNT_HW_CACHE_MAX]
@@ -410,6 +412,7 @@ static int validate_group(struct perf_event *event)
* mipsxx/rm9000/loongson2 have different performance counters, they have
* specific low-level init routines.
*/
+static void reset_counters(void *arg);
static int __hw_perf_event_init(struct perf_event *event);
static void hw_perf_event_destroy(struct perf_event *event)
@@ -487,6 +490,8 @@ handle_associated_event(struct cpu_hw_events *cpuc,
mipspmu->disable_event(idx);
}
+#include "perf_event_mipsxx.c"
+
/* Callchain handling code. */
static inline void
callchain_store(struct perf_callchain_entry *entry,
diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
new file mode 100644
index 0000000..595f4ab
--- /dev/null
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -0,0 +1,1020 @@
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) || \
+ defined(CONFIG_CPU_R10000) || defined(CONFIG_CPU_SB1)
+
+#ifdef CONFIG_MIPS_MT_SMP
+static int cpu_has_mipsmt_pertccounters;
+
+/*
+ * FIXME: For VSMP, vpe_id() is redefined for Perf-events, because
+ * cpu_data[cpuid].vpe_id reports 0 for _both_ CPUs.
+ */
+#if defined(CONFIG_HW_PERF_EVENTS)
+#define vpe_id() (cpu_has_mipsmt_pertccounters ? \
+ 0 : smp_processor_id())
+#else
+#define vpe_id() (cpu_has_mipsmt_pertccounters ? \
+ 0 : cpu_data[smp_processor_id()].vpe_id)
+#endif
+
+/* Copied from op_model_mipsxx.c */
+static inline unsigned int vpe_shift(void)
+{
+ if (num_possible_cpus() > 1)
+ return 1;
+
+ return 0;
+}
+#else /* !CONFIG_MIPS_MT_SMP */
+#define vpe_id() 0
+
+static inline unsigned int vpe_shift(void)
+{
+ return 0;
+}
+#endif /* CONFIG_MIPS_MT_SMP */
+
+static inline unsigned int
+counters_total_to_per_cpu(unsigned int counters)
+{
+ return counters >> vpe_shift();
+}
+
+static inline unsigned int
+counters_per_cpu_to_total(unsigned int counters)
+{
+ return counters << vpe_shift();
+}
+
+#define __define_perf_accessors(r, n, np) \
+ \
+static inline unsigned int r_c0_ ## r ## n(void) \
+{ \
+ unsigned int cpu = vpe_id(); \
+ \
+ switch (cpu) { \
+ case 0: \
+ return read_c0_ ## r ## n(); \
+ case 1: \
+ return read_c0_ ## r ## np(); \
+ default: \
+ BUG(); \
+ } \
+ return 0; \
+} \
+ \
+static inline void w_c0_ ## r ## n(unsigned int value) \
+{ \
+ unsigned int cpu = vpe_id(); \
+ \
+ switch (cpu) { \
+ case 0: \
+ write_c0_ ## r ## n(value); \
+ return; \
+ case 1: \
+ write_c0_ ## r ## np(value); \
+ return; \
+ default: \
+ BUG(); \
+ } \
+ return; \
+} \
+
+__define_perf_accessors(perfcntr, 0, 2)
+__define_perf_accessors(perfcntr, 1, 3)
+__define_perf_accessors(perfcntr, 2, 0)
+__define_perf_accessors(perfcntr, 3, 1)
+
+__define_perf_accessors(perfctrl, 0, 2)
+__define_perf_accessors(perfctrl, 1, 3)
+__define_perf_accessors(perfctrl, 2, 0)
+__define_perf_accessors(perfctrl, 3, 1)
+
+static inline int __n_counters(void)
+{
+ if (!(read_c0_config1() & M_CONFIG1_PC))
+ return 0;
+ if (!(read_c0_perfctrl0() & M_PERFCTL_MORE))
+ return 1;
+ if (!(read_c0_perfctrl1() & M_PERFCTL_MORE))
+ return 2;
+ if (!(read_c0_perfctrl2() & M_PERFCTL_MORE))
+ return 3;
+
+ return 4;
+}
+
+static inline int n_counters(void)
+{
+ int counters;
+
+ switch (current_cpu_type()) {
+ case CPU_R10000:
+ counters = 2;
+ break;
+
+ case CPU_R12000:
+ case CPU_R14000:
+ counters = 4;
+ break;
+
+ default:
+ counters = __n_counters();
+ }
+
+ return counters;
+}
+
+static void reset_counters(void *arg)
+{
+ int counters = (int)(long)arg;
+ switch (counters) {
+ case 4:
+ w_c0_perfctrl3(0);
+ w_c0_perfcntr3(0);
+ case 3:
+ w_c0_perfctrl2(0);
+ w_c0_perfcntr2(0);
+ case 2:
+ w_c0_perfctrl1(0);
+ w_c0_perfcntr1(0);
+ case 1:
+ w_c0_perfctrl0(0);
+ w_c0_perfcntr0(0);
+ }
+}
+
+static inline u64
+mipsxx_pmu_read_counter(unsigned int idx)
+{
+ switch (idx) {
+ case 0:
+ return r_c0_perfcntr0();
+ case 1:
+ return r_c0_perfcntr1();
+ case 2:
+ return r_c0_perfcntr2();
+ case 3:
+ return r_c0_perfcntr3();
+ default:
+ WARN_ONCE(1, "Invalid performance counter number (%d)\n", idx);
+ return 0;
+ }
+}
+
+static inline void
+mipsxx_pmu_write_counter(unsigned int idx, u64 val)
+{
+ switch (idx) {
+ case 0:
+ w_c0_perfcntr0(val);
+ return;
+ case 1:
+ w_c0_perfcntr1(val);
+ return;
+ case 2:
+ w_c0_perfcntr2(val);
+ return;
+ case 3:
+ w_c0_perfcntr3(val);
+ return;
+ }
+}
+
+static inline unsigned int
+mipsxx_pmu_read_control(unsigned int idx)
+{
+ switch (idx) {
+ case 0:
+ return r_c0_perfctrl0();
+ case 1:
+ return r_c0_perfctrl1();
+ case 2:
+ return r_c0_perfctrl2();
+ case 3:
+ return r_c0_perfctrl3();
+ default:
+ WARN_ONCE(1, "Invalid performance counter number (%d)\n", idx);
+ return 0;
+ }
+}
+
+static inline void
+mipsxx_pmu_write_control(unsigned int idx, unsigned int val)
+{
+ switch (idx) {
+ case 0:
+ w_c0_perfctrl0(val);
+ return;
+ case 1:
+ w_c0_perfctrl1(val);
+ return;
+ case 2:
+ w_c0_perfctrl2(val);
+ return;
+ case 3:
+ w_c0_perfctrl3(val);
+ return;
+ }
+}
+
+#ifdef CONFIG_MIPS_MT_SMP
+static DEFINE_RWLOCK(pmuint_rwlock);
+#endif
+
+/* 24K/34K/1004K cores can share the same event map. */
+static const struct mips_perf_event mipsxxcore_event_map
+ [PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
+ [PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
+ [PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
+ [PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x02, CNTR_EVEN, T },
+ [PERF_COUNT_HW_BRANCH_MISSES] = { 0x02, CNTR_ODD, T },
+ [PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
+};
+
+/* 74K core has different branch event code. */
+static const struct mips_perf_event mipsxx74Kcore_event_map
+ [PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
+ [PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
+ [PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
+ [PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x27, CNTR_EVEN, T },
+ [PERF_COUNT_HW_BRANCH_MISSES] = { 0x27, CNTR_ODD, T },
+ [PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
+};
+
+/* 24K/34K/1004K cores can share the same cache event map. */
+static const struct mips_perf_event mipsxxcore_cache_map
+ [PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+[C(L1D)] = {
+ /*
+ * Like some other architectures (e.g. ARM), the performance
+ * counters don't differentiate between read and write
+ * accesses/misses, so this isn't strictly correct, but it's the
+ * best we can do. Writes and reads get combined.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x0a, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x0b, CNTR_EVEN | CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x0a, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x0b, CNTR_EVEN | CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x09, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x09, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x09, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x09, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { 0x14, CNTR_EVEN, T },
+ /*
+ * Note that MIPS has only "hit" events countable for
+ * the prefetch operation.
+ */
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x15, CNTR_ODD, P },
+ [C(RESULT_MISS)] = { 0x16, CNTR_EVEN, P },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x15, CNTR_ODD, P },
+ [C(RESULT_MISS)] = { 0x16, CNTR_EVEN, P },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(DTLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x06, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x06, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x06, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x06, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x05, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x05, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x05, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x05, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(BPU)] = {
+ /* Using the same code for *HW_BRANCH* */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x02, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x02, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x02, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x02, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+};
+
+/* 74K core has completely different cache event map. */
+static const struct mips_perf_event mipsxx74Kcore_cache_map
+ [PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+[C(L1D)] = {
+ /*
+ * Like some other architectures (e.g. ARM), the performance
+ * counters don't differentiate between read and write
+ * accesses/misses, so this isn't strictly correct, but it's the
+ * best we can do. Writes and reads get combined.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x17, CNTR_ODD, T },
+ [C(RESULT_MISS)] = { 0x18, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x17, CNTR_ODD, T },
+ [C(RESULT_MISS)] = { 0x18, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x06, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x06, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x06, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x06, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { 0x34, CNTR_EVEN, T },
+ /*
+ * Note that MIPS has only "hit" events countable for
+ * the prefetch operation.
+ */
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x1c, CNTR_ODD, P },
+ [C(RESULT_MISS)] = { 0x1d, CNTR_EVEN | CNTR_ODD, P },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x1c, CNTR_ODD, P },
+ [C(RESULT_MISS)] = { 0x1d, CNTR_EVEN | CNTR_ODD, P },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(DTLB)] = {
+ /* 74K core does not have specific DTLB events. */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x04, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x04, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x04, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x04, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+[C(BPU)] = {
+ /* Using the same code for *HW_BRANCH* */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x27, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x27, CNTR_ODD, T },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { 0x27, CNTR_EVEN, T },
+ [C(RESULT_MISS)] = { 0x27, CNTR_ODD, T },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ [C(RESULT_MISS)] = { UNSUPPORTED_PERF_EVENT_ID },
+ },
+},
+};
+
+#ifdef CONFIG_MIPS_MT_SMP
+static void
+check_and_calc_range(struct perf_event *event,
+ const struct mips_perf_event *pev)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ if (event->cpu >= 0) {
+ if (pev->range > V) {
+ /*
+ * The user selected an event that is processor
+ * wide, while expecting it to be VPE wide.
+ */
+ hwc->config_base |= M_TC_EN_ALL;
+ } else {
+ /*
+ * FIXME: cpu_data[event->cpu].vpe_id reports 0
+ * for both CPUs.
+ */
+ hwc->config_base |= M_PERFCTL_VPEID(event->cpu);
+ hwc->config_base |= M_TC_EN_VPE;
+ }
+ } else
+ hwc->config_base |= M_TC_EN_ALL;
+}
+#else
+static void
+check_and_calc_range(struct perf_event *event,
+ const struct mips_perf_event *pev)
+{
+}
+#endif
+
+static int __hw_perf_event_init(struct perf_event *event)
+{
+ struct perf_event_attr *attr = &event->attr;
+ struct hw_perf_event *hwc = &event->hw;
+ const struct mips_perf_event *pev;
+ int err;
+
+ /* Returning MIPS event descriptor for generic perf event. */
+ if (PERF_TYPE_HARDWARE == event->attr.type) {
+ if (event->attr.config >= PERF_COUNT_HW_MAX)
+ return -EINVAL;
+ pev = mipspmu_map_general_event(event->attr.config);
+ } else if (PERF_TYPE_HW_CACHE == event->attr.type) {
+ pev = mipspmu_map_cache_event(event->attr.config);
+ } else if (PERF_TYPE_RAW == event->attr.type) {
+ /* We are working on the global raw event. */
+ mutex_lock(&raw_event_mutex);
+ pev = mipspmu->map_raw_event(event->attr.config);
+ } else {
+ /* The event type is not (yet) supported. */
+ return -EOPNOTSUPP;
+ }
+
+ if (IS_ERR(pev)) {
+ if (PERF_TYPE_RAW == event->attr.type)
+ mutex_unlock(&raw_event_mutex);
+ return PTR_ERR(pev);
+ }
+
+ /*
+ * We allow max flexibility on how each individual counter shared
+ * by the single CPU operates (the mode exclusion and the range).
+ */
+ hwc->config_base = M_PERFCTL_INTERRUPT_ENABLE;
+
+ /* Calculate range bits and validate it. */
+ if (num_possible_cpus() > 1)
+ check_and_calc_range(event, pev);
+
+ hwc->event_base = mipspmu_perf_event_encode(pev);
+ if (PERF_TYPE_RAW == event->attr.type)
+ mutex_unlock(&raw_event_mutex);
+
+ if (!attr->exclude_user)
+ hwc->config_base |= M_PERFCTL_USER;
+ if (!attr->exclude_kernel) {
+ hwc->config_base |= M_PERFCTL_KERNEL;
+ /* MIPS kernel mode: KSU == 00b || EXL == 1 || ERL == 1 */
+ hwc->config_base |= M_PERFCTL_EXL;
+ }
+ if (!attr->exclude_hv)
+ hwc->config_base |= M_PERFCTL_SUPERVISOR;
+
+ hwc->config_base &= M_PERFCTL_CONFIG_MASK;
+ /*
+ * The event can belong to another cpu. We do not assign a local
+ * counter for it for now.
+ */
+ hwc->idx = -1;
+ hwc->config = 0;
+
+ if (!hwc->sample_period) {
+ hwc->sample_period = MAX_PERIOD;
+ hwc->last_period = hwc->sample_period;
+ local64_set(&hwc->period_left, hwc->sample_period);
+ }
+
+ err = 0;
+ if (event->group_leader != event) {
+ err = validate_group(event);
+ if (err)
+ return -EINVAL;
+ }
+
+ event->destroy = hw_perf_event_destroy;
+
+ return err;
+}
+
+static void pause_local_counters(void)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ int counters = mipspmu->num_counters;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ switch (counters) {
+ case 4:
+ cpuc->saved_ctrl[3] = r_c0_perfctrl3();
+ w_c0_perfctrl3(cpuc->saved_ctrl[3] &
+ ~M_PERFCTL_COUNT_EVENT_WHENEVER);
+ case 3:
+ cpuc->saved_ctrl[2] = r_c0_perfctrl2();
+ w_c0_perfctrl2(cpuc->saved_ctrl[2] &
+ ~M_PERFCTL_COUNT_EVENT_WHENEVER);
+ case 2:
+ cpuc->saved_ctrl[1] = r_c0_perfctrl1();
+ w_c0_perfctrl1(cpuc->saved_ctrl[1] &
+ ~M_PERFCTL_COUNT_EVENT_WHENEVER);
+ case 1:
+ cpuc->saved_ctrl[0] = r_c0_perfctrl0();
+ w_c0_perfctrl0(cpuc->saved_ctrl[0] &
+ ~M_PERFCTL_COUNT_EVENT_WHENEVER);
+ }
+ local_irq_restore(flags);
+}
+
+static void resume_local_counters(void)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ int counters = mipspmu->num_counters;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ switch (counters) {
+ case 4:
+ w_c0_perfctrl3(cpuc->saved_ctrl[3]);
+ case 3:
+ w_c0_perfctrl2(cpuc->saved_ctrl[2]);
+ case 2:
+ w_c0_perfctrl1(cpuc->saved_ctrl[1]);
+ case 1:
+ w_c0_perfctrl0(cpuc->saved_ctrl[0]);
+ }
+ local_irq_restore(flags);
+}
+
+static int mipsxx_pmu_handle_shared_irq(void)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ struct perf_sample_data data;
+ unsigned int counters = mipspmu->num_counters;
+ unsigned int counter;
+ int handled = IRQ_NONE;
+ struct pt_regs *regs;
+
+ if (cpu_has_mips_r2 && !(read_c0_cause() & (1 << 26)))
+ return handled;
+
+ /*
+ * First we pause the local counters, so that when we are locked
+ * here, the counters are all paused. When it gets locked due to
+ * perf_disable(), the timer interrupt handler will be delayed.
+ *
+ * See also mipsxx_pmu_start().
+ */
+ pause_local_counters();
+#ifdef CONFIG_MIPS_MT_SMP
+ read_lock(&pmuint_rwlock);
+#endif
+
+ regs = get_irq_regs();
+
+ perf_sample_data_init(&data, 0);
+
+ switch (counters) {
+#define HANDLE_COUNTER(n) \
+ case n + 1: \
+ if (test_bit(n, cpuc->used_mask)) { \
+ counter = r_c0_perfcntr ## n(); \
+ if (counter & M_COUNTER_OVERFLOW) { \
+ w_c0_perfcntr ## n(counter & \
+ VALID_COUNT); \
+ if (test_and_change_bit(n, cpuc->msbs)) \
+ handle_associated_event(cpuc, \
+ n, &data, regs); \
+ handled = IRQ_HANDLED; \
+ } \
+ }
+ HANDLE_COUNTER(3)
+ HANDLE_COUNTER(2)
+ HANDLE_COUNTER(1)
+ HANDLE_COUNTER(0)
+ }
+
+ /*
+ * Do all the work for the pending perf events. We can do this
+ * in here because the performance counter interrupt is a regular
+ * interrupt, not NMI.
+ */
+ if (handled == IRQ_HANDLED)
+ perf_event_do_pending();
+
+#ifdef CONFIG_MIPS_MT_SMP
+ read_unlock(&pmuint_rwlock);
+#endif
+ resume_local_counters();
+ return handled;
+}
+
+static irqreturn_t
+mipsxx_pmu_handle_irq(int irq, void *dev)
+{
+ return mipsxx_pmu_handle_shared_irq();
+}
+
+static void mipsxx_pmu_start(void)
+{
+#ifdef CONFIG_MIPS_MT_SMP
+ write_unlock(&pmuint_rwlock);
+#endif
+ resume_local_counters();
+}
+
+/*
+ * MIPS performance counters can be per-TC. The control registers can
+ * not be directly accessed accross CPUs. Hence if we want to do global
+ * control, we need cross CPU calls. on_each_cpu() can help us, but we
+ * can not make sure this function is called with interrupts enabled. So
+ * here we pause local counters and then grab a rwlock and leave the
+ * counters on other CPUs alone. If any counter interrupt raises while
+ * we own the write lock, simply pause local counters on that CPU and
+ * spin in the handler. Also we know we won't be switched to another
+ * CPU after pausing local counters and before grabbing the lock.
+ */
+static void mipsxx_pmu_stop(void)
+{
+ pause_local_counters();
+#ifdef CONFIG_MIPS_MT_SMP
+ write_lock(&pmuint_rwlock);
+#endif
+}
+
+static int
+mipsxx_pmu_alloc_counter(struct cpu_hw_events *cpuc,
+ struct hw_perf_event *hwc)
+{
+ int i;
+
+ /*
+ * We only need to care the counter mask. The range has been
+ * checked definitely.
+ */
+ unsigned long cntr_mask = (hwc->event_base >> 8) & 0xffff;
+
+ for (i = mipspmu->num_counters - 1; i >= 0; i--) {
+ /*
+ * Note that some MIPS perf events can be counted by both
+ * even and odd counters, wheresas many other are only by
+ * even _or_ odd counters. This introduces an issue that
+ * when the former kind of event takes the counter the
+ * latter kind of event wants to use, then the "counter
+ * allocation" for the latter event will fail. In fact if
+ * they can be dynamically swapped, they both feel happy.
+ * But here we leave this issue alone for now.
+ */
+ if (test_bit(i, &cntr_mask) &&
+ !test_and_set_bit(i, cpuc->used_mask))
+ return i;
+ }
+
+ return -EAGAIN;
+}
+
+static void
+mipsxx_pmu_enable_event(struct hw_perf_event *evt, int idx)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ unsigned long flags;
+
+ WARN_ON(idx < 0 || idx >= mipspmu->num_counters);
+
+ local_irq_save(flags);
+ cpuc->saved_ctrl[idx] = M_PERFCTL_EVENT(evt->event_base & 0xff) |
+ (evt->config_base & M_PERFCTL_CONFIG_MASK) |
+ /* Make sure interrupt enabled. */
+ M_PERFCTL_INTERRUPT_ENABLE;
+ /*
+ * We do not actually let the counter run. Leave it until start().
+ */
+ local_irq_restore(flags);
+}
+
+static void
+mipsxx_pmu_disable_event(int idx)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ unsigned long flags;
+
+ WARN_ON(idx < 0 || idx >= mipspmu->num_counters);
+
+ local_irq_save(flags);
+ cpuc->saved_ctrl[idx] = mipsxx_pmu_read_control(idx) &
+ ~M_PERFCTL_COUNT_EVENT_WHENEVER;
+ mipsxx_pmu_write_control(idx, cpuc->saved_ctrl[idx]);
+ local_irq_restore(flags);
+}
+
+/* 24K */
+#define IS_UNSUPPORTED_24K_EVENT(r, b) \
+ ((b) == 12 || (r) == 151 || (r) == 152 || (b) == 26 || \
+ (b) == 27 || (r) == 28 || (r) == 158 || (b) == 31 || \
+ (b) == 32 || (b) == 34 || (b) == 36 || (r) == 168 || \
+ (r) == 172 || (b) == 47 || ((b) >= 56 && (b) <= 63) || \
+ ((b) >= 68 && (b) <= 127))
+#define IS_BOTH_COUNTERS_24K_EVENT(b) \
+ ((b) == 0 || (b) == 1 || (b) == 11)
+
+/* 34K */
+#define IS_UNSUPPORTED_34K_EVENT(r, b) \
+ ((b) == 12 || (r) == 27 || (r) == 158 || (b) == 36 || \
+ (b) == 38 || (r) == 175 || ((b) >= 56 && (b) <= 63) || \
+ ((b) >= 68 && (b) <= 127))
+#define IS_BOTH_COUNTERS_34K_EVENT(b) \
+ ((b) == 0 || (b) == 1 || (b) == 11)
+#ifdef CONFIG_MIPS_MT_SMP
+#define IS_RANGE_P_34K_EVENT(r, b) \
+ ((b) == 0 || (r) == 18 || (b) == 21 || (b) == 22 || \
+ (b) == 25 || (b) == 39 || (r) == 44 || (r) == 174 || \
+ (r) == 176 || ((b) >= 50 && (b) <= 55) || \
+ ((b) >= 64 && (b) <= 67))
+#define IS_RANGE_V_34K_EVENT(r) ((r) == 47)
+#endif
+
+/* 74K */
+#define IS_UNSUPPORTED_74K_EVENT(r, b) \
+ ((r) == 5 || ((r) >= 135 && (r) <= 137) || \
+ ((b) >= 10 && (b) <= 12) || (b) == 22 || (b) == 27 || \
+ (b) == 33 || (b) == 34 || ((b) >= 47 && (b) <= 49) || \
+ (r) == 178 || (b) == 55 || (b) == 57 || (b) == 60 || \
+ (b) == 61 || (r) == 62 || (r) == 191 || \
+ ((b) >= 64 && (b) <= 127))
+#define IS_BOTH_COUNTERS_74K_EVENT(b) \
+ ((b) == 0 || (b) == 1)
+
+/* 1004K */
+#define IS_UNSUPPORTED_1004K_EVENT(r, b) \
+ ((b) == 12 || (r) == 27 || (r) == 158 || (b) == 38 || \
+ (r) == 175 || (b) == 63 || ((b) >= 68 && (b) <= 127))
+#define IS_BOTH_COUNTERS_1004K_EVENT(b) \
+ ((b) == 0 || (b) == 1 || (b) == 11)
+#ifdef CONFIG_MIPS_MT_SMP
+#define IS_RANGE_P_1004K_EVENT(r, b) \
+ ((b) == 0 || (r) == 18 || (b) == 21 || (b) == 22 || \
+ (b) == 25 || (b) == 36 || (b) == 39 || (r) == 44 || \
+ (r) == 174 || (r) == 176 || ((b) >= 50 && (b) <= 59) || \
+ (r) == 188 || (b) == 61 || (b) == 62 || \
+ ((b) >= 64 && (b) <= 67))
+#define IS_RANGE_V_1004K_EVENT(r) ((r) == 47)
+#endif
+
+/*
+ * User can use 0-255 raw events, where 0-127 for the events of even
+ * counters, and 128-255 for odd counters. Note that bit 7 is used to
+ * indicate the parity. So, for example, when user wants to take the
+ * Event Num of 15 for odd counters (by referring to the user manual),
+ * then 128 needs to be added to 15 as the input for the event config,
+ * i.e., 143 (0x8F) to be used.
+ */
+static const struct mips_perf_event *
+mipsxx_pmu_map_raw_event(u64 config)
+{
+ unsigned int raw_id = config & 0xff;
+ unsigned int base_id = raw_id & 0x7f;
+
+ switch (current_cpu_type()) {
+ case CPU_24K:
+ if (IS_UNSUPPORTED_24K_EVENT(raw_id, base_id))
+ return ERR_PTR(-EOPNOTSUPP);
+ raw_event.event_id = base_id;
+ if (IS_BOTH_COUNTERS_24K_EVENT(base_id))
+ raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
+ else
+ raw_event.cntr_mask =
+ raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+#ifdef CONFIG_MIPS_MT_SMP
+ /*
+ * This is actually doing nothing. Non-multithreading
+ * CPUs will not check and calculate the range.
+ */
+ raw_event.range = P;
+#endif
+ break;
+ case CPU_34K:
+ if (IS_UNSUPPORTED_34K_EVENT(raw_id, base_id))
+ return ERR_PTR(-EOPNOTSUPP);
+ raw_event.event_id = base_id;
+ if (IS_BOTH_COUNTERS_34K_EVENT(base_id))
+ raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
+ else
+ raw_event.cntr_mask =
+ raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+#ifdef CONFIG_MIPS_MT_SMP
+ if (IS_RANGE_P_34K_EVENT(raw_id, base_id))
+ raw_event.range = P;
+ else if (unlikely(IS_RANGE_V_34K_EVENT(raw_id)))
+ raw_event.range = V;
+ else
+ raw_event.range = T;
+#endif
+ break;
+ case CPU_74K:
+ if (IS_UNSUPPORTED_74K_EVENT(raw_id, base_id))
+ return ERR_PTR(-EOPNOTSUPP);
+ raw_event.event_id = base_id;
+ if (IS_BOTH_COUNTERS_74K_EVENT(base_id))
+ raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
+ else
+ raw_event.cntr_mask =
+ raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+#ifdef CONFIG_MIPS_MT_SMP
+ raw_event.range = P;
+#endif
+ break;
+ case CPU_1004K:
+ if (IS_UNSUPPORTED_1004K_EVENT(raw_id, base_id))
+ return ERR_PTR(-EOPNOTSUPP);
+ raw_event.event_id = base_id;
+ if (IS_BOTH_COUNTERS_1004K_EVENT(base_id))
+ raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
+ else
+ raw_event.cntr_mask =
+ raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+#ifdef CONFIG_MIPS_MT_SMP
+ if (IS_RANGE_P_1004K_EVENT(raw_id, base_id))
+ raw_event.range = P;
+ else if (unlikely(IS_RANGE_V_1004K_EVENT(raw_id)))
+ raw_event.range = V;
+ else
+ raw_event.range = T;
+#endif
+ break;
+ }
+
+ return &raw_event;
+}
+
+static struct mips_pmu mipsxxcore_pmu = {
+ .handle_irq = mipsxx_pmu_handle_irq,
+ .handle_shared_irq = mipsxx_pmu_handle_shared_irq,
+ .start = mipsxx_pmu_start,
+ .stop = mipsxx_pmu_stop,
+ .alloc_counter = mipsxx_pmu_alloc_counter,
+ .read_counter = mipsxx_pmu_read_counter,
+ .write_counter = mipsxx_pmu_write_counter,
+ .enable_event = mipsxx_pmu_enable_event,
+ .disable_event = mipsxx_pmu_disable_event,
+ .map_raw_event = mipsxx_pmu_map_raw_event,
+ .general_event_map = &mipsxxcore_event_map,
+ .cache_event_map = &mipsxxcore_cache_map,
+};
+
+static struct mips_pmu mipsxx74Kcore_pmu = {
+ .handle_irq = mipsxx_pmu_handle_irq,
+ .handle_shared_irq = mipsxx_pmu_handle_shared_irq,
+ .start = mipsxx_pmu_start,
+ .stop = mipsxx_pmu_stop,
+ .alloc_counter = mipsxx_pmu_alloc_counter,
+ .read_counter = mipsxx_pmu_read_counter,
+ .write_counter = mipsxx_pmu_write_counter,
+ .enable_event = mipsxx_pmu_enable_event,
+ .disable_event = mipsxx_pmu_disable_event,
+ .map_raw_event = mipsxx_pmu_map_raw_event,
+ .general_event_map = &mipsxx74Kcore_event_map,
+ .cache_event_map = &mipsxx74Kcore_cache_map,
+};
+
+static int __init
+init_hw_perf_events(void)
+{
+ int counters, irq;
+
+ pr_info("Performance counters: ");
+
+ counters = n_counters();
+ if (counters == 0) {
+ pr_cont("No available PMU.\n");
+ return -ENODEV;
+ }
+
+#ifdef CONFIG_MIPS_MT_SMP
+ cpu_has_mipsmt_pertccounters = read_c0_config7() & (1<<19);
+ if (!cpu_has_mipsmt_pertccounters)
+ counters = counters_total_to_per_cpu(counters);
+#endif
+
+#ifdef MSC01E_INT_BASE
+ if (cpu_has_veic) {
+ /*
+ * Using platform specific interrupt controller defines.
+ */
+ irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
+ } else {
+#endif
+ if (cp0_perfcount_irq >= 0)
+ irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
+ else
+ irq = -1;
+#ifdef MSC01E_INT_BASE
+ }
+#endif
+
+ on_each_cpu(reset_counters, (void *)(long)counters, 1);
+
+ switch (current_cpu_type()) {
+ case CPU_24K:
+ mipsxxcore_pmu.name = "mips/24K";
+ mipsxxcore_pmu.num_counters = counters;
+ mipsxxcore_pmu.irq = irq;
+ mipspmu = &mipsxxcore_pmu;
+ break;
+ case CPU_34K:
+ mipsxxcore_pmu.name = "mips/34K";
+ mipsxxcore_pmu.num_counters = counters;
+ mipsxxcore_pmu.irq = irq;
+ mipspmu = &mipsxxcore_pmu;
+ break;
+ case CPU_74K:
+ mipsxx74Kcore_pmu.name = "mips/74K";
+ mipsxx74Kcore_pmu.num_counters = counters;
+ mipsxx74Kcore_pmu.irq = irq;
+ mipspmu = &mipsxx74Kcore_pmu;
+ break;
+ case CPU_1004K:
+ mipsxxcore_pmu.name = "mips/1004K";
+ mipsxxcore_pmu.num_counters = counters;
+ mipsxxcore_pmu.irq = irq;
+ mipspmu = &mipsxxcore_pmu;
+ break;
+ default:
+ pr_cont("Either hardware does not support performance "
+ "counters, or not yet implemented.\n");
+ return -ENODEV;
+ }
+
+ if (mipspmu)
+ pr_cont("%s PMU enabled, %d counters available to each "
+ "CPU, irq %d%s\n", mipspmu->name, counters, irq,
+ irq < 0 ? " (share with timer interrupt)" : "");
+
+ return 0;
+}
+arch_initcall(init_hw_perf_events);
+
+#endif /* defined(CONFIG_CPU_MIPS32)... */
--
1.7.0.4
^ permalink raw reply related [flat|nested] 13+ messages in thread