summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--arch/arm/Kconfig15
-rw-r--r--arch/arm/include/asm/perf_event.h31
-rw-r--r--arch/arm/include/asm/pmu.h75
-rw-r--r--arch/arm/kernel/Makefile2
-rw-r--r--arch/arm/kernel/perf_event.c2276
-rw-r--r--arch/arm/kernel/pmu.c103
-rw-r--r--arch/arm/mm/fault.c7
-rw-r--r--arch/arm/oprofile/op_model_arm11_core.c4
-rw-r--r--arch/arm/oprofile/op_model_arm11_core.h4
-rw-r--r--arch/arm/oprofile/op_model_mpcore.c42
-rw-r--r--arch/arm/oprofile/op_model_v6.c30
-rw-r--r--arch/arm/oprofile/op_model_v7.c30
-rw-r--r--arch/arm/oprofile/op_model_v7.h4
-rw-r--r--arch/arm/oprofile/op_model_xscale.c35
14 files changed, 2594 insertions, 64 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7afc6150ac71..100b90f3778a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -20,6 +20,8 @@ config ARM
select HAVE_GENERIC_DMA_COHERENT
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZO
+ select HAVE_PERF_EVENTS
+ select PERF_USE_VMALLOC
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
@@ -877,6 +879,11 @@ config XSCALE_PMU
depends on CPU_XSCALE && !XSCALE_PMU_TIMER
default y
+config CPU_HAS_PMU
+ depends on CPU_V6 || CPU_V7 || XSCALE_PMU
+ default y
+ bool
+
if !MMU
source "arch/arm/Kconfig-nommu"
endif
@@ -1181,6 +1188,14 @@ config HIGHPTE
depends on HIGHMEM
depends on !OUTER_CACHE
+config HW_PERF_EVENTS
+ bool "Enable hardware performance counter support for perf events"
+ depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
+ default y
+ help
+ Enable hardware performance counter support for perf events. If
+ disabled, perf events will use software events only.
+
source "mm/Kconfig"
config LEDS
diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h
new file mode 100644
index 000000000000..49e3049aba32
--- /dev/null
+++ b/arch/arm/include/asm/perf_event.h
@@ -0,0 +1,31 @@
+/*
+ * linux/arch/arm/include/asm/perf_event.h
+ *
+ * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
+ *
+ * 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 __ARM_PERF_EVENT_H__
+#define __ARM_PERF_EVENT_H__
+
+/*
+ * NOP: on *most* (read: all supported) ARM platforms, the performance
+ * counter interrupts are regular interrupts and not an NMI. This
+ * means that when we receive the interrupt we can call
+ * perf_event_do_pending() that handles all of the work with
+ * interrupts enabled.
+ */
+static inline void
+set_perf_event_pending(void)
+{
+}
+
+/* ARM performance counters start from 1 (in the cp15 accesses) so use the
+ * same indexes here for consistency. */
+#define PERF_EVENT_INDEX_OFFSET 1
+
+#endif /* __ARM_PERF_EVENT_H__ */
diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
new file mode 100644
index 000000000000..2829b9f981a1
--- /dev/null
+++ b/arch/arm/include/asm/pmu.h
@@ -0,0 +1,75 @@
+/*
+ * linux/arch/arm/include/asm/pmu.h
+ *
+ * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
+ *
+ * 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 __ARM_PMU_H__
+#define __ARM_PMU_H__
+
+#ifdef CONFIG_CPU_HAS_PMU
+
+struct pmu_irqs {
+ const int *irqs;
+ int num_irqs;
+};
+
+/**
+ * reserve_pmu() - reserve the hardware performance counters
+ *
+ * Reserve the hardware performance counters in the system for exclusive use.
+ * The 'struct pmu_irqs' for the system is returned on success, ERR_PTR()
+ * encoded error on failure.
+ */
+extern const struct pmu_irqs *
+reserve_pmu(void);
+
+/**
+ * release_pmu() - Relinquish control of the performance counters
+ *
+ * Release the performance counters and allow someone else to use them.
+ * Callers must have disabled the counters and released IRQs before calling
+ * this. The 'struct pmu_irqs' returned from reserve_pmu() must be passed as
+ * a cookie.
+ */
+extern int
+release_pmu(const struct pmu_irqs *irqs);
+
+/**
+ * init_pmu() - Initialise the PMU.
+ *
+ * Initialise the system ready for PMU enabling. This should typically set the
+ * IRQ affinity and nothing else. The users (oprofile/perf events etc) will do
+ * the actual hardware initialisation.
+ */
+extern int
+init_pmu(void);
+
+#else /* CONFIG_CPU_HAS_PMU */
+
+static inline const struct pmu_irqs *
+reserve_pmu(void)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline int
+release_pmu(const struct pmu_irqs *irqs)
+{
+ return -ENODEV;
+}
+
+static inline int
+init_pmu(void)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_CPU_HAS_PMU */
+
+#endif /* __ARM_PMU_H__ */
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index dd00f747e2ad..c76e6d2679b8 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -46,6 +46,8 @@ obj-$(CONFIG_CPU_XSCALE) += xscale-cp0.o
obj-$(CONFIG_CPU_XSC3) += xscale-cp0.o
obj-$(CONFIG_CPU_MOHAWK) += xscale-cp0.o
obj-$(CONFIG_IWMMXT) += iwmmxt.o
+obj-$(CONFIG_CPU_HAS_PMU) += pmu.o
+obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
ifneq ($(CONFIG_ARCH_EBSA110),y)
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
new file mode 100644
index 000000000000..c54ceb3d1f97
--- /dev/null
+++ b/arch/arm/kernel/perf_event.c
@@ -0,0 +1,2276 @@
+#undef DEBUG
+
+/*
+ * ARM performance counter support.
+ *
+ * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
+ *
+ * ARMv7 support: Jean Pihet <jpihet@mvista.com>
+ * 2010 (c) MontaVista Software, LLC.
+ *
+ * This code is based on the sparc64 perf event code, which is in turn based
+ * on the x86 code. Callchain code is based on the ARM OProfile backtrace
+ * code.
+ */
+#define pr_fmt(fmt) "hw perfevents: " fmt
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/perf_event.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+#include <asm/cputype.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/pmu.h>
+#include <asm/stacktrace.h>
+
+static const struct pmu_irqs *pmu_irqs;
+
+/*
+ * Hardware lock to serialize accesses to PMU registers. Needed for the
+ * read/modify/write sequences.
+ */
+DEFINE_SPINLOCK(pmu_lock);
+
+/*
+ * ARMv6 supports a maximum of 3 events, starting from index 1. If we add
+ * another platform that supports more, we need to increase this to be the
+ * largest of all platforms.
+ *
+ * ARMv7 supports up to 32 events:
+ * cycle counter CCNT + 31 events counters CNT0..30.
+ * Cortex-A8 has 1+4 counters, Cortex-A9 has 1+6 counters.
+ */
+#define ARMPMU_MAX_HWEVENTS 33
+
+/* The events for a given CPU. */
+struct cpu_hw_events {
+ /*
+ * The events that are active on the CPU for the given index. Index 0
+ * is reserved.
+ */
+ struct perf_event *events[ARMPMU_MAX_HWEVENTS];
+
+ /*
+ * A 1 bit for an index indicates that the counter is being used for
+ * an event. A 0 means that the counter can be used.
+ */
+ unsigned long used_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)];
+
+ /*
+ * A 1 bit for an index indicates that the counter is actively being
+ * used.
+ */
+ unsigned long active_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)];
+};
+DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events);
+
+struct arm_pmu {
+ char *name;
+ irqreturn_t (*handle_irq)(int irq_num, void *dev);
+ void (*enable)(struct hw_perf_event *evt, int idx);
+ void (*disable)(struct hw_perf_event *evt, int idx);
+ int (*event_map)(int evt);
+ u64 (*raw_event)(u64);
+ int (*get_event_idx)(struct cpu_hw_events *cpuc,
+ struct hw_perf_event *hwc);
+ u32 (*read_counter)(int idx);
+ void (*write_counter)(int idx, u32 val);
+ void (*start)(void);
+ void (*stop)(void);
+ int num_events;
+ u64 max_period;
+};
+
+/* Set at runtime when we know what CPU type we are. */
+static const struct arm_pmu *armpmu;
+
+#define HW_OP_UNSUPPORTED 0xFFFF
+
+#define C(_x) \
+ PERF_COUNT_HW_CACHE_##_x
+
+#define CACHE_OP_UNSUPPORTED 0xFFFF
+
+static unsigned armpmu_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX];
+
+static int
+armpmu_map_cache_event(u64 config)
+{
+ unsigned int cache_type, cache_op, cache_result, ret;
+
+ cache_type = (config >> 0) & 0xff;
+ if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
+ return -EINVAL;
+
+ cache_op = (config >> 8) & 0xff;
+ if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
+ return -EINVAL;
+
+ cache_result = (config >> 16) & 0xff;
+ if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+ return -EINVAL;
+
+ ret = (int)armpmu_perf_cache_map[cache_type][cache_op][cache_result];
+
+ if (ret == CACHE_OP_UNSUPPORTED)
+ return -ENOENT;
+
+ return ret;
+}
+
+static int
+armpmu_event_set_period(struct perf_event *event,
+ struct hw_perf_event *hwc,
+ int idx)
+{
+ s64 left = atomic64_read(&hwc->period_left);
+ s64 period = hwc->sample_period;
+ int ret = 0;
+
+ if (unlikely(left <= -period)) {
+ left = period;
+ atomic64_set(&hwc->period_left, left);
+ hwc->last_period = period;
+ ret = 1;
+ }
+
+ if (unlikely(left <= 0)) {
+ left += period;
+ atomic64_set(&hwc->period_left, left);
+ hwc->last_period = period;
+ ret = 1;
+ }
+
+ if (left > (s64)armpmu->max_period)
+ left = armpmu->max_period;
+
+ atomic64_set(&hwc->prev_count, (u64)-left);
+
+ armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
+
+ perf_event_update_userpage(event);
+
+ return ret;
+}
+
+static u64
+armpmu_event_update(struct perf_event *event,
+ struct hw_perf_event *hwc,
+ int idx)
+{
+ int shift = 64 - 32;
+ s64 prev_raw_count, new_raw_count;
+ s64 delta;
+
+again:
+ prev_raw_count = atomic64_read(&hwc->prev_count);
+ new_raw_count = armpmu->read_counter(idx);
+
+ if (atomic64_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;
+
+ atomic64_add(delta, &event->count);
+ atomic64_sub(delta, &hwc->period_left);
+
+ return new_raw_count;
+}
+
+static void
+armpmu_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);
+
+ clear_bit(idx, cpuc->active_mask);
+ armpmu->disable(hwc, idx);
+
+ barrier();
+
+ armpmu_event_update(event, hwc, idx);
+ cpuc->events[idx] = NULL;
+ clear_bit(idx, cpuc->used_mask);
+
+ perf_event_update_userpage(event);
+}
+
+static void
+armpmu_read(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ /* Don't read disabled counters! */
+ if (hwc->idx < 0)
+ return;
+
+ armpmu_event_update(event, hwc, hwc->idx);
+}
+
+static void
+armpmu_unthrottle(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+
+ /*
+ * Set the period again. Some counters can't be stopped, so when we
+ * were throttled we simply disabled the IRQ source and the counter
+ * may have been left counting. If we don't do this step then we may
+ * get an interrupt too soon or *way* too late if the overflow has
+ * happened since disabling.
+ */
+ armpmu_event_set_period(event, hwc, hwc->idx);
+ armpmu->enable(hwc, hwc->idx);
+}
+
+static int
+armpmu_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;
+
+ /* If we don't have a space for the counter then finish early. */
+ idx = armpmu->get_event_idx(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;
+ armpmu->disable(hwc, idx);
+ cpuc->events[idx] = event;
+ set_bit(idx, cpuc->active_mask);
+
+ /* Set the period for the event. */
+ armpmu_event_set_period(event, hwc, idx);
+
+ /* Enable the event. */
+ armpmu->enable(hwc, idx);
+
+ /* Propagate our changes to the userspace mapping. */
+ perf_event_update_userpage(event);
+
+out:
+ return err;
+}
+
+static struct pmu pmu = {
+ .enable = armpmu_enable,
+ .disable = armpmu_disable,
+ .unthrottle = armpmu_unthrottle,
+ .read = armpmu_read,
+};
+
+static int
+validate_event(struct cpu_hw_events *cpuc,
+ struct perf_event *event)
+{
+ struct hw_perf_event fake_event = event->hw;
+
+ if (event->pmu && event->pmu != &pmu)
+ return 0;
+
+ return armpmu->get_event_idx(cpuc, &fake_event) >= 0;
+}
+
+static int
+validate_group(struct perf_event *event)
+{
+ struct perf_event *sibling, *leader = event->group_leader;
+ struct cpu_hw_events fake_pmu;
+
+ memset(&fake_pmu, 0, sizeof(fake_pmu));
+
+ if (!validate_event(&fake_pmu, leader))
+ return -ENOSPC;
+
+ list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
+ if (!validate_event(&fake_pmu, sibling))
+ return -ENOSPC;
+ }
+
+ if (!validate_event(&fake_pmu, event))
+ return -ENOSPC;
+
+ return 0;
+}
+
+static int
+armpmu_reserve_hardware(void)
+{
+ int i;
+ int err;
+
+ pmu_irqs = reserve_pmu();
+ if (IS_ERR(pmu_irqs)) {
+ pr_warning("unable to reserve pmu\n");
+ return PTR_ERR(pmu_irqs);
+ }
+
+ init_pmu();
+
+ if (pmu_irqs->num_irqs < 1) {
+ pr_err("no irqs for PMUs defined\n");
+ return -ENODEV;
+ }
+
+ for (i = 0; i < pmu_irqs->num_irqs; ++i) {
+ err = request_irq(pmu_irqs->irqs[i], armpmu->handle_irq,
+ IRQF_DISABLED, "armpmu", NULL);
+ if (err) {
+ pr_warning("unable to request IRQ%d for ARM "
+ "perf counters\n", pmu_irqs->irqs[i]);
+ break;
+ }
+ }
+
+ if (err) {
+ for (i = i - 1; i >= 0; --i)
+ free_irq(pmu_irqs->irqs[i], NULL);
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
+ }
+
+ return err;
+}
+
+static void
+armpmu_release_hardware(void)
+{
+ int i;
+
+ for (i = pmu_irqs->num_irqs - 1; i >= 0; --i)
+ free_irq(pmu_irqs->irqs[i], NULL);
+ armpmu->stop();
+
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
+}
+
+static atomic_t active_events = ATOMIC_INIT(0);
+static DEFINE_MUTEX(pmu_reserve_mutex);
+
+static void
+hw_perf_event_destroy(struct perf_event *event)
+{
+ if (atomic_dec_and_mutex_lock(&active_events, &pmu_reserve_mutex)) {
+ armpmu_release_hardware();
+ mutex_unlock(&pmu_reserve_mutex);
+ }
+}
+
+static int
+__hw_perf_event_init(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ int mapping, err;
+
+ /* Decode the generic type into an ARM event identifier. */
+ if (PERF_TYPE_HARDWARE == event->attr.type) {
+ mapping = armpmu->event_map(event->attr.config);
+ } else if (PERF_TYPE_HW_CACHE == event->attr.type) {
+ mapping = armpmu_map_cache_event(event->attr.config);
+ } else if (PERF_TYPE_RAW == event->attr.type) {
+ mapping = armpmu->raw_event(event->attr.config);
+ } else {
+ pr_debug("event type %x not supported\n", event->attr.type);
+ return -EOPNOTSUPP;
+ }
+
+ if (mapping < 0) {
+ pr_debug("event %x:%llx not supported\n", event->attr.type,
+ event->attr.config);
+ return mapping;
+ }
+
+ /*
+ * Check whether we need to exclude the counter from certain modes.
+ * The ARM performance counters are on all of the time so if someone
+ * has asked us for some excludes then we have to fail.
+ */
+ if (event->attr.exclude_kernel || event->attr.exclude_user ||
+ event->attr.exclude_hv || event->attr.exclude_idle) {
+ pr_debug("ARM performance counters do not support "
+ "mode exclusion\n");
+ return -EPERM;
+ }
+
+ /*
+ * We don't assign an index until we actually place the event onto
+ * hardware. Use -1 to signify that we haven't decided where to put it
+ * yet. For SMP systems, each core has it's own PMU so we can't do any
+ * clever allocation or constraints checking at this point.
+ */
+ hwc->idx = -1;
+
+ /*
+ * Store the event encoding into the config_base field. config and
+ * event_base are unused as the only 2 things we need to know are
+ * the event mapping and the counter to use. The counter to use is
+ * also the indx and the config_base is the event type.
+ */
+ hwc->config_base = (unsigned long)mapping;
+ hwc->config = 0;
+ hwc->event_base = 0;
+
+ if (!hwc->sample_period) {
+ hwc->sample_period = armpmu->max_period;
+ hwc->last_period = hwc->sample_period;
+ atomic64_set(&hwc->period_left, hwc->sample_period);
+ }
+
+ err = 0;
+ if (event->group_leader != event) {
+ err = validate_group(event);
+ if (err)
+ return -EINVAL;
+ }
+
+ return err;
+}
+
+const struct pmu *
+hw_perf_event_init(struct perf_event *event)
+{
+ int err = 0;
+
+ if (!armpmu)
+ return ERR_PTR(-ENODEV);
+
+ event->destroy = hw_perf_event_destroy;
+
+ if (!atomic_inc_not_zero(&active_events)) {
+ if (atomic_read(&active_events) > perf_max_events) {
+ atomic_dec(&active_events);
+ return ERR_PTR(-ENOSPC);
+ }
+
+ mutex_lock(&pmu_reserve_mutex);
+ if (atomic_read(&active_events) == 0) {
+ err = armpmu_reserve_hardware();
+ }
+
+ 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)
+{
+ /* Enable all of the perf events on hardware. */
+ int idx;
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+
+ if (!armpmu)
+ return;
+
+ for (idx = 0; idx <= armpmu->num_events; ++idx) {
+ struct perf_event *event = cpuc->events[idx];
+
+ if (!event)
+ continue;
+
+ armpmu->enable(&event->hw, idx);
+ }
+
+ armpmu->start();
+}
+
+void
+hw_perf_disable(void)
+{
+ if (armpmu)
+ armpmu->stop();
+}
+
+/*
+ * ARMv6 Performance counter handling code.
+ *
+ * ARMv6 has 2 configurable performance counters and a single cycle counter.
+ * They all share a single reset bit but can be written to zero so we can use
+ * that for a reset.
+ *
+ * The counters can't be individually enabled or disabled so when we remove
+ * one event and replace it with another we could get spurious counts from the
+ * wrong event. However, we can take advantage of the fact that the
+ * performance counters can export events to the event bus, and the event bus
+ * itself can be monitored. This requires that we *don't* export the events to
+ * the event bus. The procedure for disabling a configurable counter is:
+ * - change the counter to count the ETMEXTOUT[0] signal (0x20). This
+ * effectively stops the counter from counting.
+ * - disable the counter's interrupt generation (each counter has it's
+ * own interrupt enable bit).
+ * Once stopped, the counter value can be written as 0 to reset.
+ *
+ * To enable a counter:
+ * - enable the counter's interrupt generation.
+ * - set the new event type.
+ *
+ * Note: the dedicated cycle counter only counts cycles and can't be
+ * enabled/disabled independently of the others. When we want to disable the
+ * cycle counter, we have to just disable the interrupt reporting and start
+ * ignoring that counter. When re-enabling, we have to reset the value and
+ * enable the interrupt.
+ */
+
+enum armv6_perf_types {
+ ARMV6_PERFCTR_ICACHE_MISS = 0x0,
+ ARMV6_PERFCTR_IBUF_STALL = 0x1,
+ ARMV6_PERFCTR_DDEP_STALL = 0x2,
+ ARMV6_PERFCTR_ITLB_MISS = 0x3,
+ ARMV6_PERFCTR_DTLB_MISS = 0x4,
+ ARMV6_PERFCTR_BR_EXEC = 0x5,
+ ARMV6_PERFCTR_BR_MISPREDICT = 0x6,
+ ARMV6_PERFCTR_INSTR_EXEC = 0x7,
+ ARMV6_PERFCTR_DCACHE_HIT = 0x9,
+ ARMV6_PERFCTR_DCACHE_ACCESS = 0xA,
+ ARMV6_PERFCTR_DCACHE_MISS = 0xB,
+ ARMV6_PERFCTR_DCACHE_WBACK = 0xC,
+ ARMV6_PERFCTR_SW_PC_CHANGE = 0xD,
+ ARMV6_PERFCTR_MAIN_TLB_MISS = 0xF,
+ ARMV6_PERFCTR_EXPL_D_ACCESS = 0x10,
+ ARMV6_PERFCTR_LSU_FULL_STALL = 0x11,
+ ARMV6_PERFCTR_WBUF_DRAINED = 0x12,
+ ARMV6_PERFCTR_CPU_CYCLES = 0xFF,
+ ARMV6_PERFCTR_NOP = 0x20,
+};
+
+enum armv6_counters {
+ ARMV6_CYCLE_COUNTER = 1,
+ ARMV6_COUNTER0,
+ ARMV6_COUNTER1,
+};
+
+/*
+ * The hardware events that we support. We do support cache operations but
+ * we have harvard caches and no way to combine instruction and data
+ * accesses/misses in hardware.
+ */
+static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = ARMV6_PERFCTR_CPU_CYCLES,
+ [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6_PERFCTR_INSTR_EXEC,
+ [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC,
+ [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6_PERFCTR_BR_MISPREDICT,
+ [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
+};
+
+static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+ [C(L1D)] = {
+ /*
+ * 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)] = ARMV6_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(DTLB)] = {
+ /*
+ * The ARM performance counters can count micro DTLB misses,
+ * micro ITLB misses and main TLB misses. There isn't an event
+ * for TLB misses, so use the micro misses here and if users
+ * want the main TLB misses they can use a raw counter.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(BPU)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+};
+
+enum armv6mpcore_perf_types {
+ ARMV6MPCORE_PERFCTR_ICACHE_MISS = 0x0,
+ ARMV6MPCORE_PERFCTR_IBUF_STALL = 0x1,
+ ARMV6MPCORE_PERFCTR_DDEP_STALL = 0x2,
+ ARMV6MPCORE_PERFCTR_ITLB_MISS = 0x3,
+ ARMV6MPCORE_PERFCTR_DTLB_MISS = 0x4,
+ ARMV6MPCORE_PERFCTR_BR_EXEC = 0x5,
+ ARMV6MPCORE_PERFCTR_BR_NOTPREDICT = 0x6,
+ ARMV6MPCORE_PERFCTR_BR_MISPREDICT = 0x7,
+ ARMV6MPCORE_PERFCTR_INSTR_EXEC = 0x8,
+ ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
+ ARMV6MPCORE_PERFCTR_DCACHE_RDMISS = 0xB,
+ ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
+ ARMV6MPCORE_PERFCTR_DCACHE_WRMISS = 0xD,
+ ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
+ ARMV6MPCORE_PERFCTR_SW_PC_CHANGE = 0xF,
+ ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS = 0x10,
+ ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
+ ARMV6MPCORE_PERFCTR_LSU_FULL_STALL = 0x12,
+ ARMV6MPCORE_PERFCTR_WBUF_DRAINED = 0x13,
+ ARMV6MPCORE_PERFCTR_CPU_CYCLES = 0xFF,
+};
+
+/*
+ * The hardware events that we support. We do support cache operations but
+ * we have harvard caches and no way to combine instruction and data
+ * accesses/misses in hardware.
+ */
+static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
+ [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
+ [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC,
+ [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
+ [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
+};
+
+static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+ [C(L1D)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] =
+ ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
+ [C(RESULT_MISS)] =
+ ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] =
+ ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
+ [C(RESULT_MISS)] =
+ ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(DTLB)] = {
+ /*
+ * The ARM performance counters can count micro DTLB misses,
+ * micro ITLB misses and main TLB misses. There isn't an event
+ * for TLB misses, so use the micro misses here and if users
+ * want the main TLB misses they can use a raw counter.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(BPU)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+};
+
+static inline unsigned long
+armv6_pmcr_read(void)
+{
+ u32 val;
+ asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r"(val));
+ return val;
+}
+
+static inline void
+armv6_pmcr_write(unsigned long val)
+{
+ asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r"(val));
+}
+
+#define ARMV6_PMCR_ENABLE (1 << 0)
+#define ARMV6_PMCR_CTR01_RESET (1 << 1)
+#define ARMV6_PMCR_CCOUNT_RESET (1 << 2)
+#define ARMV6_PMCR_CCOUNT_DIV (1 << 3)
+#define ARMV6_PMCR_COUNT0_IEN (1 << 4)
+#define ARMV6_PMCR_COUNT1_IEN (1 << 5)
+#define ARMV6_PMCR_CCOUNT_IEN (1 << 6)
+#define ARMV6_PMCR_COUNT0_OVERFLOW (1 << 8)
+#define ARMV6_PMCR_COUNT1_OVERFLOW (1 << 9)
+#define ARMV6_PMCR_CCOUNT_OVERFLOW (1 << 10)
+#define ARMV6_PMCR_EVT_COUNT0_SHIFT 20
+#define ARMV6_PMCR_EVT_COUNT0_MASK (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
+#define ARMV6_PMCR_EVT_COUNT1_SHIFT 12
+#define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
+
+#define ARMV6_PMCR_OVERFLOWED_MASK \
+ (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
+ ARMV6_PMCR_CCOUNT_OVERFLOW)
+
+static inline int
+armv6_pmcr_has_overflowed(unsigned long pmcr)
+{
+ return (pmcr & ARMV6_PMCR_OVERFLOWED_MASK);
+}
+
+static inline int
+armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
+ enum armv6_counters counter)
+{
+ int ret = 0;
+
+ if (ARMV6_CYCLE_COUNTER == counter)
+ ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
+ else if (ARMV6_COUNTER0 == counter)
+ ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
+ else if (ARMV6_COUNTER1 == counter)
+ ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
+ else
+ WARN_ONCE(1, "invalid counter number (%d)\n", counter);
+
+ return ret;
+}
+
+static inline u32
+armv6pmu_read_counter(int counter)
+{
+ unsigned long value = 0;
+
+ if (ARMV6_CYCLE_COUNTER == counter)
+ asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r"(value));
+ else if (ARMV6_COUNTER0 == counter)
+ asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r"(value));
+ else if (ARMV6_COUNTER1 == counter)
+ asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r"(value));
+ else
+ WARN_ONCE(1, "invalid counter number (%d)\n", counter);
+
+ return value;
+}
+
+static inline void
+armv6pmu_write_counter(int counter,
+ u32 value)
+{
+ if (ARMV6_CYCLE_COUNTER == counter)
+ asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r"(value));
+ else if (ARMV6_COUNTER0 == counter)
+ asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r"(value));
+ else if (ARMV6_COUNTER1 == counter)
+ asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r"(value));
+ else
+ WARN_ONCE(1, "invalid counter number (%d)\n", counter);
+}
+
+void
+armv6pmu_enable_event(struct hw_perf_event *hwc,
+ int idx)
+{
+ unsigned long val, mask, evt, flags;
+
+ if (ARMV6_CYCLE_COUNTER == idx) {
+ mask = 0;
+ evt = ARMV6_PMCR_CCOUNT_IEN;
+ } else if (ARMV6_COUNTER0 == idx) {
+ mask = ARMV6_PMCR_EVT_COUNT0_MASK;
+ evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
+ ARMV6_PMCR_COUNT0_IEN;
+ } else if (ARMV6_COUNTER1 == idx) {
+ mask = ARMV6_PMCR_EVT_COUNT1_MASK;
+ evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
+ ARMV6_PMCR_COUNT1_IEN;
+ } else {
+ WARN_ONCE(1, "invalid counter number (%d)\n", idx);
+ return;
+ }
+
+ /*
+ * Mask out the current event and set the counter to count the event
+ * that we're interested in.
+ */
+ spin_lock_irqsave(&pmu_lock, flags);
+ val = armv6_pmcr_read();
+ val &= ~mask;
+ val |= evt;
+ armv6_pmcr_write(val);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static irqreturn_t
+armv6pmu_handle_irq(int irq_num,
+ void *dev)
+{
+ unsigned long pmcr = armv6_pmcr_read();
+ struct perf_sample_data data;
+ struct cpu_hw_events *cpuc;
+ struct pt_regs *regs;
+ int idx;
+
+ if (!armv6_pmcr_has_overflowed(pmcr))
+ return IRQ_NONE;
+
+ regs = get_irq_regs();
+
+ /*
+ * The interrupts are cleared by writing the overflow flags back to
+ * the control register. All of the other bits don't have any effect
+ * if they are rewritten, so write the whole value back.
+ */
+ armv6_pmcr_write(pmcr);
+
+ data.addr = 0;
+
+ cpuc = &__get_cpu_var(cpu_hw_events);
+ for (idx = 0; idx <= armpmu->num_events; ++idx) {
+ struct perf_event *event = cpuc->events[idx];
+ struct hw_perf_event *hwc;
+
+ if (!test_bit(idx, cpuc->active_mask))
+ continue;
+
+ /*
+ * We have a single interrupt for all counters. Check that
+ * each counter has overflowed before we process it.
+ */
+ if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
+ continue;
+
+ hwc = &event->hw;
+ armpmu_event_update(event, hwc, idx);
+ data.period = event->hw.last_period;
+ if (!armpmu_event_set_period(event, hwc, idx))
+ continue;
+
+ if (perf_event_overflow(event, 0, &data, regs))
+ armpmu->disable(hwc, idx);
+ }
+
+ /*
+ * Handle the pending perf events.
+ *
+ * Note: this call *must* be run with interrupts enabled. For
+ * platforms that can have the PMU interrupts raised as a PMI, this
+ * will not work.
+ */
+ perf_event_do_pending();
+
+ return IRQ_HANDLED;
+}
+
+static void
+armv6pmu_start(void)
+{
+ unsigned long flags, val;
+
+ spin_lock_irqsave(&pmu_lock, flags);
+ val = armv6_pmcr_read();
+ val |= ARMV6_PMCR_ENABLE;
+ armv6_pmcr_write(val);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+void
+armv6pmu_stop(void)
+{
+ unsigned long flags, val;
+
+ spin_lock_irqsave(&pmu_lock, flags);
+ val = armv6_pmcr_read();
+ val &= ~ARMV6_PMCR_ENABLE;
+ armv6_pmcr_write(val);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static inline int
+armv6pmu_event_map(int config)
+{
+ int mapping = armv6_perf_map[config];
+ if (HW_OP_UNSUPPORTED == mapping)
+ mapping = -EOPNOTSUPP;
+ return mapping;
+}
+
+static inline int
+armv6mpcore_pmu_event_map(int config)
+{
+ int mapping = armv6mpcore_perf_map[config];
+ if (HW_OP_UNSUPPORTED == mapping)
+ mapping = -EOPNOTSUPP;
+ return mapping;
+}
+
+static u64
+armv6pmu_raw_event(u64 config)
+{
+ return config & 0xff;
+}
+
+static int
+armv6pmu_get_event_idx(struct cpu_hw_events *cpuc,
+ struct hw_perf_event *event)
+{
+ /* Always place a cycle counter into the cycle counter. */
+ if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) {
+ if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
+ return -EAGAIN;
+
+ return ARMV6_CYCLE_COUNTER;
+ } else {
+ /*
+ * For anything other than a cycle counter, try and use
+ * counter0 and counter1.
+ */
+ if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask)) {
+ return ARMV6_COUNTER1;
+ }
+
+ if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask)) {
+ return ARMV6_COUNTER0;
+ }
+
+ /* The counters are all in use. */
+ return -EAGAIN;
+ }
+}
+
+static void
+armv6pmu_disable_event(struct hw_perf_event *hwc,
+ int idx)
+{
+ unsigned long val, mask, evt, flags;
+
+ if (ARMV6_CYCLE_COUNTER == idx) {
+ mask = ARMV6_PMCR_CCOUNT_IEN;
+ evt = 0;
+ } else if (ARMV6_COUNTER0 == idx) {
+ mask = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
+ evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
+ } else if (ARMV6_COUNTER1 == idx) {
+ mask = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
+ evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
+ } else {
+ WARN_ONCE(1, "invalid counter number (%d)\n", idx);
+ return;
+ }
+
+ /*
+ * Mask out the current event and set the counter to count the number
+ * of ETM bus signal assertion cycles. The external reporting should
+ * be disabled and so this should never increment.
+ */
+ spin_lock_irqsave(&pmu_lock, flags);
+ val = armv6_pmcr_read();
+ val &= ~mask;
+ val |= evt;
+ armv6_pmcr_write(val);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static void
+armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
+ int idx)
+{
+ unsigned long val, mask, flags, evt = 0;
+
+ if (ARMV6_CYCLE_COUNTER == idx) {
+ mask = ARMV6_PMCR_CCOUNT_IEN;
+ } else if (ARMV6_COUNTER0 == idx) {
+ mask = ARMV6_PMCR_COUNT0_IEN;
+ } else if (ARMV6_COUNTER1 == idx) {
+ mask = ARMV6_PMCR_COUNT1_IEN;
+ } else {
+ WARN_ONCE(1, "invalid counter number (%d)\n", idx);
+ return;
+ }
+
+ /*
+ * Unlike UP ARMv6, we don't have a way of stopping the counters. We
+ * simply disable the interrupt reporting.
+ */
+ spin_lock_irqsave(&pmu_lock, flags);
+ val = armv6_pmcr_read();
+ val &= ~mask;
+ val |= evt;
+ armv6_pmcr_write(val);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static const struct arm_pmu armv6pmu = {
+ .name = "v6",
+ .handle_irq = armv6pmu_handle_irq,
+ .enable = armv6pmu_enable_event,
+ .disable = armv6pmu_disable_event,
+ .event_map = armv6pmu_event_map,
+ .raw_event = armv6pmu_raw_event,
+ .read_counter = armv6pmu_read_counter,
+ .write_counter = armv6pmu_write_counter,
+ .get_event_idx = armv6pmu_get_event_idx,
+ .start = armv6pmu_start,
+ .stop = armv6pmu_stop,
+ .num_events = 3,
+ .max_period = (1LLU << 32) - 1,
+};
+
+/*
+ * ARMv6mpcore is almost identical to single core ARMv6 with the exception
+ * that some of the events have different enumerations and that there is no
+ * *hack* to stop the programmable counters. To stop the counters we simply
+ * disable the interrupt reporting and update the event. When unthrottling we
+ * reset the period and enable the interrupt reporting.
+ */
+static const struct arm_pmu armv6mpcore_pmu = {
+ .name = "v6mpcore",
+ .handle_irq = armv6pmu_handle_irq,
+ .enable = armv6pmu_enable_event,
+ .disable = armv6mpcore_pmu_disable_event,
+ .event_map = armv6mpcore_pmu_event_map,
+ .raw_event = armv6pmu_raw_event,
+ .read_counter = armv6pmu_read_counter,
+ .write_counter = armv6pmu_write_counter,
+ .get_event_idx = armv6pmu_get_event_idx,
+ .start = armv6pmu_start,
+ .stop = armv6pmu_stop,
+ .num_events = 3,
+ .max_period = (1LLU << 32) - 1,
+};
+
+/*
+ * ARMv7 Cortex-A8 and Cortex-A9 Performance Events handling code.
+ *
+ * Copied from ARMv6 code, with the low level code inspired
+ * by the ARMv7 Oprofile code.
+ *
+ * Cortex-A8 has up to 4 configurable performance counters and
+ * a single cycle counter.
+ * Cortex-A9 has up to 31 configurable performance counters and
+ * a single cycle counter.
+ *
+ * All counters can be enabled/disabled and IRQ masked separately. The cycle
+ * counter and all 4 performance counters together can be reset separately.
+ */
+
+#define ARMV7_PMU_CORTEX_A8_NAME "ARMv7 Cortex-A8"
+
+#define ARMV7_PMU_CORTEX_A9_NAME "ARMv7 Cortex-A9"
+
+/* Common ARMv7 event types */
+enum armv7_perf_types {
+ ARMV7_PERFCTR_PMNC_SW_INCR = 0x00,
+ ARMV7_PERFCTR_IFETCH_MISS = 0x01,
+ ARMV7_PERFCTR_ITLB_MISS = 0x02,
+ ARMV7_PERFCTR_DCACHE_REFILL = 0x03,
+ ARMV7_PERFCTR_DCACHE_ACCESS = 0x04,
+ ARMV7_PERFCTR_DTLB_REFILL = 0x05,
+ ARMV7_PERFCTR_DREAD = 0x06,
+ ARMV7_PERFCTR_DWRITE = 0x07,
+
+ ARMV7_PERFCTR_EXC_TAKEN = 0x09,
+ ARMV7_PERFCTR_EXC_EXECUTED = 0x0A,
+ ARMV7_PERFCTR_CID_WRITE = 0x0B,
+ /* ARMV7_PERFCTR_PC_WRITE is equivalent to HW_BRANCH_INSTRUCTIONS.
+ * It counts:
+ * - all branch instructions,
+ * - instructions that explicitly write the PC,
+ * - exception generating instructions.
+ */
+ ARMV7_PERFCTR_PC_WRITE = 0x0C,
+ ARMV7_PERFCTR_PC_IMM_BRANCH = 0x0D,
+ ARMV7_PERFCTR_UNALIGNED_ACCESS = 0x0F,
+ ARMV7_PERFCTR_PC_BRANCH_MIS_PRED = 0x10,
+ ARMV7_PERFCTR_CLOCK_CYCLES = 0x11,
+
+ ARMV7_PERFCTR_PC_BRANCH_MIS_USED = 0x12,
+
+ ARMV7_PERFCTR_CPU_CYCLES = 0xFF
+};
+
+/* ARMv7 Cortex-A8 specific event types */
+enum armv7_a8_perf_types {
+ ARMV7_PERFCTR_INSTR_EXECUTED = 0x08,
+
+ ARMV7_PERFCTR_PC_PROC_RETURN = 0x0E,
+
+ ARMV7_PERFCTR_WRITE_BUFFER_FULL = 0x40,
+ ARMV7_PERFCTR_L2_STORE_MERGED = 0x41,
+ ARMV7_PERFCTR_L2_STORE_BUFF = 0x42,
+ ARMV7_PERFCTR_L2_ACCESS = 0x43,
+ ARMV7_PERFCTR_L2_CACH_MISS = 0x44,
+ ARMV7_PERFCTR_AXI_READ_CYCLES = 0x45,
+ ARMV7_PERFCTR_AXI_WRITE_CYCLES = 0x46,
+ ARMV7_PERFCTR_MEMORY_REPLAY = 0x47,
+ ARMV7_PERFCTR_UNALIGNED_ACCESS_REPLAY = 0x48,
+ ARMV7_PERFCTR_L1_DATA_MISS = 0x49,
+ ARMV7_PERFCTR_L1_INST_MISS = 0x4A,
+ ARMV7_PERFCTR_L1_DATA_COLORING = 0x4B,
+ ARMV7_PERFCTR_L1_NEON_DATA = 0x4C,
+ ARMV7_PERFCTR_L1_NEON_CACH_DATA = 0x4D,
+ ARMV7_PERFCTR_L2_NEON = 0x4E,
+ ARMV7_PERFCTR_L2_NEON_HIT = 0x4F,
+ ARMV7_PERFCTR_L1_INST = 0x50,
+ ARMV7_PERFCTR_PC_RETURN_MIS_PRED = 0x51,
+ ARMV7_PERFCTR_PC_BRANCH_FAILED = 0x52,
+ ARMV7_PERFCTR_PC_BRANCH_TAKEN = 0x53,
+ ARMV7_PERFCTR_PC_BRANCH_EXECUTED = 0x54,
+ ARMV7_PERFCTR_OP_EXECUTED = 0x55,
+ ARMV7_PERFCTR_CYCLES_INST_STALL = 0x56,
+ ARMV7_PERFCTR_CYCLES_INST = 0x57,
+ ARMV7_PERFCTR_CYCLES_NEON_DATA_STALL = 0x58,
+ ARMV7_PERFCTR_CYCLES_NEON_INST_STALL = 0x59,
+ ARMV7_PERFCTR_NEON_CYCLES = 0x5A,
+
+ ARMV7_PERFCTR_PMU0_EVENTS = 0x70,
+ ARMV7_PERFCTR_PMU1_EVENTS = 0x71,
+ ARMV7_PERFCTR_PMU_EVENTS = 0x72,
+};
+
+/* ARMv7 Cortex-A9 specific event types */
+enum armv7_a9_perf_types {
+ ARMV7_PERFCTR_JAVA_HW_BYTECODE_EXEC = 0x40,
+ ARMV7_PERFCTR_JAVA_SW_BYTECODE_EXEC = 0x41,
+ ARMV7_PERFCTR_JAZELLE_BRANCH_EXEC = 0x42,
+
+ ARMV7_PERFCTR_COHERENT_LINE_MISS = 0x50,
+ ARMV7_PERFCTR_COHERENT_LINE_HIT = 0x51,
+
+ ARMV7_PERFCTR_ICACHE_DEP_STALL_CYCLES = 0x60,
+ ARMV7_PERFCTR_DCACHE_DEP_STALL_CYCLES = 0x61,
+ ARMV7_PERFCTR_TLB_MISS_DEP_STALL_CYCLES = 0x62,
+ ARMV7_PERFCTR_STREX_EXECUTED_PASSED = 0x63,
+ ARMV7_PERFCTR_STREX_EXECUTED_FAILED = 0x64,
+ ARMV7_PERFCTR_DATA_EVICTION = 0x65,
+ ARMV7_PERFCTR_ISSUE_STAGE_NO_INST = 0x66,
+ ARMV7_PERFCTR_ISSUE_STAGE_EMPTY = 0x67,
+ ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE = 0x68,
+
+ ARMV7_PERFCTR_PREDICTABLE_FUNCT_RETURNS = 0x6E,
+
+ ARMV7_PERFCTR_MAIN_UNIT_EXECUTED_INST = 0x70,
+ ARMV7_PERFCTR_SECOND_UNIT_EXECUTED_INST = 0x71,
+ ARMV7_PERFCTR_LD_ST_UNIT_EXECUTED_INST = 0x72,
+ ARMV7_PERFCTR_FP_EXECUTED_INST = 0x73,
+ ARMV7_PERFCTR_NEON_EXECUTED_INST = 0x74,
+
+ ARMV7_PERFCTR_PLD_FULL_DEP_STALL_CYCLES = 0x80,
+ ARMV7_PERFCTR_DATA_WR_DEP_STALL_CYCLES = 0x81,
+ ARMV7_PERFCTR_ITLB_MISS_DEP_STALL_CYCLES = 0x82,
+ ARMV7_PERFCTR_DTLB_MISS_DEP_STALL_CYCLES = 0x83,
+ ARMV7_PERFCTR_MICRO_ITLB_MISS_DEP_STALL_CYCLES = 0x84,
+ ARMV7_PERFCTR_MICRO_DTLB_MISS_DEP_STALL_CYCLES = 0x85,
+ ARMV7_PERFCTR_DMB_DEP_STALL_CYCLES = 0x86,
+
+ ARMV7_PERFCTR_INTGR_CLK_ENABLED_CYCLES = 0x8A,
+ ARMV7_PERFCTR_DATA_ENGINE_CLK_EN_CYCLES = 0x8B,
+
+ ARMV7_PERFCTR_ISB_INST = 0x90,
+ ARMV7_PERFCTR_DSB_INST = 0x91,
+ ARMV7_PERFCTR_DMB_INST = 0x92,
+ ARMV7_PERFCTR_EXT_INTERRUPTS = 0x93,
+
+ ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_COMPLETED = 0xA0,
+ ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_SKIPPED = 0xA1,
+ ARMV7_PERFCTR_PLE_FIFO_FLUSH = 0xA2,
+ ARMV7_PERFCTR_PLE_RQST_COMPLETED = 0xA3,
+ ARMV7_PERFCTR_PLE_FIFO_OVERFLOW = 0xA4,
+ ARMV7_PERFCTR_PLE_RQST_PROG = 0xA5
+};
+
+/*
+ * Cortex-A8 HW events mapping
+ *
+ * The hardware events that we support. We do support cache operations but
+ * we have harvard caches and no way to combine instruction and data
+ * accesses/misses in hardware.
+ */
+static const unsigned armv7_a8_perf_map[PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES,
+ [PERF_COUNT_HW_INSTRUCTIONS] = ARMV7_PERFCTR_INSTR_EXECUTED,
+ [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE,
+ [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES,
+};
+
+static const unsigned armv7_a8_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+ [C(L1D)] = {
+ /*
+ * 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)] = ARMV7_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(DTLB)] = {
+ /*
+ * Only ITLB misses and DTLB refills are supported.
+ * If users want the DTLB refills misses a raw counter
+ * must be used.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(BPU)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
+ [C(RESULT_MISS)]
+ = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
+ [C(RESULT_MISS)]
+ = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+};
+
+/*
+ * Cortex-A9 HW events mapping
+ */
+static const unsigned armv7_a9_perf_map[PERF_COUNT_HW_MAX] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES,
+ [PERF_COUNT_HW_INSTRUCTIONS] =
+ ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE,
+ [PERF_COUNT_HW_CACHE_REFERENCES] = ARMV7_PERFCTR_COHERENT_LINE_HIT,
+ [PERF_COUNT_HW_CACHE_MISSES] = ARMV7_PERFCTR_COHERENT_LINE_MISS,
+ [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE,
+ [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES,
+};
+
+static const unsigned armv7_a9_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+ [C(L1D)] = {
+ /*
+ * 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)] = ARMV7_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(DTLB)] = {
+ /*
+ * Only ITLB misses and DTLB refills are supported.
+ * If users want the DTLB refills misses a raw counter
+ * must be used.
+ */
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+ [C(BPU)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
+ [C(RESULT_MISS)]
+ = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
+ [C(RESULT_MISS)]
+ = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
+ [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
+ },
+ },
+};
+
+/*
+ * Perf Events counters
+ */
+enum armv7_counters {
+ ARMV7_CYCLE_COUNTER = 1, /* Cycle counter */
+ ARMV7_COUNTER0 = 2, /* First event counter */
+};
+
+/*
+ * The cycle counter is ARMV7_CYCLE_COUNTER.
+ * The first event counter is ARMV7_COUNTER0.
+ * The last event counter is (ARMV7_COUNTER0 + armpmu->num_events - 1).
+ */
+#define ARMV7_COUNTER_LAST (ARMV7_COUNTER0 + armpmu->num_events - 1)
+
+/*
+ * ARMv7 low level PMNC access
+ */
+
+/*
+ * Per-CPU PMNC: config reg
+ */
+#define ARMV7_PMNC_E (1 << 0) /* Enable all counters */
+#define ARMV7_PMNC_P (1 << 1) /* Reset all counters */
+#define ARMV7_PMNC_C (1 << 2) /* Cycle counter reset */
+#define ARMV7_PMNC_D (1 << 3) /* CCNT counts every 64th cpu cycle */
+#define ARMV7_PMNC_X (1 << 4) /* Export to ETM */
+#define ARMV7_PMNC_DP (1 << 5) /* Disable CCNT if non-invasive debug*/
+#define ARMV7_PMNC_N_SHIFT 11 /* Number of counters supported */
+#define ARMV7_PMNC_N_MASK 0x1f
+#define ARMV7_PMNC_MASK 0x3f /* Mask for writable bits */
+
+/*
+ * Available counters
+ */
+#define ARMV7_CNT0 0 /* First event counter */
+#define ARMV7_CCNT 31 /* Cycle counter */
+
+/* Perf Event to low level counters mapping */
+#define ARMV7_EVENT_CNT_TO_CNTx (ARMV7_COUNTER0 - ARMV7_CNT0)
+
+/*
+ * CNTENS: counters enable reg
+ */
+#define ARMV7_CNTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
+#define ARMV7_CNTENS_C (1 << ARMV7_CCNT)
+
+/*
+ * CNTENC: counters disable reg
+ */
+#define ARMV7_CNTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
+#define ARMV7_CNTENC_C (1 << ARMV7_CCNT)
+
+/*
+ * INTENS: counters overflow interrupt enable reg
+ */
+#define ARMV7_INTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
+#define ARMV7_INTENS_C (1 << ARMV7_CCNT)
+
+/*
+ * INTENC: counters overflow interrupt disable reg
+ */
+#define ARMV7_INTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
+#define ARMV7_INTENC_C (1 << ARMV7_CCNT)
+
+/*
+ * EVTSEL: Event selection reg
+ */
+#define ARMV7_EVTSEL_MASK 0x7f /* Mask for writable bits */
+
+/*
+ * SELECT: Counter selection reg
+ */
+#define ARMV7_SELECT_MASK 0x1f /* Mask for writable bits */
+
+/*
+ * FLAG: counters overflow flag status reg
+ */
+#define ARMV7_FLAG_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
+#define ARMV7_FLAG_C (1 << ARMV7_CCNT)
+#define ARMV7_FLAG_MASK 0xffffffff /* Mask for writable bits */
+#define ARMV7_OVERFLOWED_MASK ARMV7_FLAG_MASK
+
+static inline unsigned long armv7_pmnc_read(void)
+{
+ u32 val;
+ asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r"(val));
+ return val;
+}
+
+static inline void armv7_pmnc_write(unsigned long val)
+{
+ val &= ARMV7_PMNC_MASK;
+ asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r"(val));
+}
+
+static inline int armv7_pmnc_has_overflowed(unsigned long pmnc)
+{
+ return pmnc & ARMV7_OVERFLOWED_MASK;
+}
+
+static inline int armv7_pmnc_counter_has_overflowed(unsigned long pmnc,
+ enum armv7_counters counter)
+{
+ int ret;
+
+ if (counter == ARMV7_CYCLE_COUNTER)
+ ret = pmnc & ARMV7_FLAG_C;
+ else if ((counter >= ARMV7_COUNTER0) && (counter <= ARMV7_COUNTER_LAST))
+ ret = pmnc & ARMV7_FLAG_P(counter);
+ else
+ pr_err("CPU%u checking wrong counter %d overflow status\n",
+ smp_processor_id(), counter);
+
+ return ret;
+}
+
+static inline int armv7_pmnc_select_counter(unsigned int idx)
+{
+ u32 val;
+
+ if ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST)) {
+ pr_err("CPU%u selecting wrong PMNC counter"
+ " %d\n", smp_processor_id(), idx);
+ return -1;
+ }
+
+ val = (idx - ARMV7_EVENT_CNT_TO_CNTx) & ARMV7_SELECT_MASK;
+ asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));
+
+ return idx;
+}
+
+static inline u32 armv7pmu_read_counter(int idx)
+{
+ unsigned long value = 0;
+
+ if (idx == ARMV7_CYCLE_COUNTER)
+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (value));
+ else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) {
+ if (armv7_pmnc_select_counter(idx) == idx)
+ asm volatile("mrc p15, 0, %0, c9, c13, 2"
+ : "=r" (value));
+ } else
+ pr_err("CPU%u reading wrong counter %d\n",
+ smp_processor_id(), idx);
+
+ return value;
+}
+
+static inline void armv7pmu_write_counter(int idx, u32 value)
+{
+ if (idx == ARMV7_CYCLE_COUNTER)
+ asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (value));
+ else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) {
+ if (armv7_pmnc_select_counter(idx) == idx)
+ asm volatile("mcr p15, 0, %0, c9, c13, 2"
+ : : "r" (value));
+ } else
+ pr_err("CPU%u writing wrong counter %d\n",
+ smp_processor_id(), idx);
+}
+
+static inline void armv7_pmnc_write_evtsel(unsigned int idx, u32 val)
+{
+ if (armv7_pmnc_select_counter(idx) == idx) {
+ val &= ARMV7_EVTSEL_MASK;
+ asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
+ }
+}
+
+static inline u32 armv7_pmnc_enable_counter(unsigned int idx)
+{
+ u32 val;
+
+ if ((idx != ARMV7_CYCLE_COUNTER) &&
+ ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
+ pr_err("CPU%u enabling wrong PMNC counter"
+ " %d\n", smp_processor_id(), idx);
+ return -1;
+ }
+
+ if (idx == ARMV7_CYCLE_COUNTER)
+ val = ARMV7_CNTENS_C;
+ else
+ val = ARMV7_CNTENS_P(idx);
+
+ asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));
+
+ return idx;
+}
+
+static inline u32 armv7_pmnc_disable_counter(unsigned int idx)
+{
+ u32 val;
+
+
+ if ((idx != ARMV7_CYCLE_COUNTER) &&
+ ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
+ pr_err("CPU%u disabling wrong PMNC counter"
+ " %d\n", smp_processor_id(), idx);
+ return -1;
+ }
+
+ if (idx == ARMV7_CYCLE_COUNTER)
+ val = ARMV7_CNTENC_C;
+ else
+ val = ARMV7_CNTENC_P(idx);
+
+ asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));
+
+ return idx;
+}
+
+static inline u32 armv7_pmnc_enable_intens(unsigned int idx)
+{
+ u32 val;
+
+ if ((idx != ARMV7_CYCLE_COUNTER) &&
+ ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
+ pr_err("CPU%u enabling wrong PMNC counter"
+ " interrupt enable %d\n", smp_processor_id(), idx);
+ return -1;
+ }
+
+ if (idx == ARMV7_CYCLE_COUNTER)
+ val = ARMV7_INTENS_C;
+ else
+ val = ARMV7_INTENS_P(idx);
+
+ asm volatile("mcr p15, 0, %0, c9, c14, 1" : : "r" (val));
+
+ return idx;
+}
+
+static inline u32 armv7_pmnc_disable_intens(unsigned int idx)
+{
+ u32 val;
+
+ if ((idx != ARMV7_CYCLE_COUNTER) &&
+ ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
+ pr_err("CPU%u disabling wrong PMNC counter"
+ " interrupt enable %d\n", smp_processor_id(), idx);
+ return -1;
+ }
+
+ if (idx == ARMV7_CYCLE_COUNTER)
+ val = ARMV7_INTENC_C;
+ else
+ val = ARMV7_INTENC_P(idx);
+
+ asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val));
+
+ return idx;
+}
+
+static inline u32 armv7_pmnc_getreset_flags(void)
+{
+ u32 val;
+
+ /* Read */
+ asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val));
+
+ /* Write to clear flags */
+ val &= ARMV7_FLAG_MASK;
+ asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (val));
+
+ return val;
+}
+
+#ifdef DEBUG
+static void armv7_pmnc_dump_regs(void)
+{
+ u32 val;
+ unsigned int cnt;
+
+ printk(KERN_INFO "PMNC registers dump:\n");
+
+ asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
+ printk(KERN_INFO "PMNC =0x%08x\n", val);
+
+ asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r" (val));
+ printk(KERN_INFO "CNTENS=0x%08x\n", val);
+
+ asm volatile("mrc p15, 0, %0, c9, c14, 1" : "=r" (val));
+ printk(KERN_INFO "INTENS=0x%08x\n", val);
+
+ asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val));
+ printk(KERN_INFO "FLAGS =0x%08x\n", val);
+
+ asm volatile("mrc p15, 0, %0, c9, c12, 5" : "=r" (val));
+ printk(KERN_INFO "SELECT=0x%08x\n", val);
+
+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
+ printk(KERN_INFO "CCNT =0x%08x\n", val);
+
+ for (cnt = ARMV7_COUNTER0; cnt < ARMV7_COUNTER_LAST; cnt++) {
+ armv7_pmnc_select_counter(cnt);
+ asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val));
+ printk(KERN_INFO "CNT[%d] count =0x%08x\n",
+ cnt-ARMV7_EVENT_CNT_TO_CNTx, val);
+ asm volatile("mrc p15, 0, %0, c9, c13, 1" : "=r" (val));
+ printk(KERN_INFO "CNT[%d] evtsel=0x%08x\n",
+ cnt-ARMV7_EVENT_CNT_TO_CNTx, val);
+ }
+}
+#endif
+
+void armv7pmu_enable_event(struct hw_perf_event *hwc, int idx)
+{
+ unsigned long flags;
+
+ /*
+ * Enable counter and interrupt, and set the counter to count
+ * the event that we're interested in.
+ */
+ spin_lock_irqsave(&pmu_lock, flags);
+
+ /*
+ * Disable counter
+ */
+ armv7_pmnc_disable_counter(idx);
+
+ /*
+ * Set event (if destined for PMNx counters)
+ * We don't need to set the event if it's a cycle count
+ */
+ if (idx != ARMV7_CYCLE_COUNTER)
+ armv7_pmnc_write_evtsel(idx, hwc->config_base);
+
+ /*
+ * Enable interrupt for this counter
+ */
+ armv7_pmnc_enable_intens(idx);
+
+ /*
+ * Enable counter
+ */
+ armv7_pmnc_enable_counter(idx);
+
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static void armv7pmu_disable_event(struct hw_perf_event *hwc, int idx)
+{
+ unsigned long flags;
+
+ /*
+ * Disable counter and interrupt
+ */
+ spin_lock_irqsave(&pmu_lock, flags);
+
+ /*
+ * Disable counter
+ */
+ armv7_pmnc_disable_counter(idx);
+
+ /*
+ * Disable interrupt for this counter
+ */
+ armv7_pmnc_disable_intens(idx);
+
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static irqreturn_t armv7pmu_handle_irq(int irq_num, void *dev)
+{
+ unsigned long pmnc;
+ struct perf_sample_data data;
+ struct cpu_hw_events *cpuc;
+ struct pt_regs *regs;
+ int idx;
+
+ /*
+ * Get and reset the IRQ flags
+ */
+ pmnc = armv7_pmnc_getreset_flags();
+
+ /*
+ * Did an overflow occur?
+ */
+ if (!armv7_pmnc_has_overflowed(pmnc))
+ return IRQ_NONE;
+
+ /*
+ * Handle the counter(s) overflow(s)
+ */
+ regs = get_irq_regs();
+
+ data.addr = 0;
+
+ cpuc = &__get_cpu_var(cpu_hw_events);
+ for (idx = 0; idx <= armpmu->num_events; ++idx) {
+ struct perf_event *event = cpuc->events[idx];
+ struct hw_perf_event *hwc;
+
+ if (!test_bit(idx, cpuc->active_mask))
+ continue;
+
+ /*
+ * We have a single interrupt for all counters. Check that
+ * each counter has overflowed before we process it.
+ */
+ if (!armv7_pmnc_counter_has_overflowed(pmnc, idx))
+ continue;
+
+ hwc = &event->hw;
+ armpmu_event_update(event, hwc, idx);
+ data.period = event->hw.last_period;
+ if (!armpmu_event_set_period(event, hwc, idx))
+ continue;
+
+ if (perf_event_overflow(event, 0, &data, regs))
+ armpmu->disable(hwc, idx);
+ }
+
+ /*
+ * Handle the pending perf events.
+ *
+ * Note: this call *must* be run with interrupts enabled. For
+ * platforms that can have the PMU interrupts raised as a PMI, this
+ * will not work.
+ */
+ perf_event_do_pending();
+
+ return IRQ_HANDLED;
+}
+
+static void armv7pmu_start(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pmu_lock, flags);
+ /* Enable all counters */
+ armv7_pmnc_write(armv7_pmnc_read() | ARMV7_PMNC_E);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static void armv7pmu_stop(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pmu_lock, flags);
+ /* Disable all counters */
+ armv7_pmnc_write(armv7_pmnc_read() & ~ARMV7_PMNC_E);
+ spin_unlock_irqrestore(&pmu_lock, flags);
+}
+
+static inline int armv7_a8_pmu_event_map(int config)
+{
+ int mapping = armv7_a8_perf_map[config];
+ if (HW_OP_UNSUPPORTED == mapping)
+ mapping = -EOPNOTSUPP;
+ return mapping;
+}
+
+static inline int armv7_a9_pmu_event_map(int config)
+{
+ int mapping = armv7_a9_perf_map[config];
+ if (HW_OP_UNSUPPORTED == mapping)
+ mapping = -EOPNOTSUPP;
+ return mapping;
+}
+
+static u64 armv7pmu_raw_event(u64 config)
+{
+ return config & 0xff;
+}
+
+static int armv7pmu_get_event_idx(struct cpu_hw_events *cpuc,
+ struct hw_perf_event *event)
+{
+ int idx;
+
+ /* Always place a cycle counter into the cycle counter. */
+ if (event->config_base == ARMV7_PERFCTR_CPU_CYCLES) {
+ if (test_and_set_bit(ARMV7_CYCLE_COUNTER, cpuc->used_mask))
+ return -EAGAIN;
+
+ return ARMV7_CYCLE_COUNTER;
+ } else {
+ /*
+ * For anything other than a cycle counter, try and use
+ * the events counters
+ */
+ for (idx = ARMV7_COUNTER0; idx <= armpmu->num_events; ++idx) {
+ if (!test_and_set_bit(idx, cpuc->used_mask))
+ return idx;
+ }
+
+ /* The counters are all in use. */
+ return -EAGAIN;
+ }
+}
+
+static struct arm_pmu armv7pmu = {
+ .handle_irq = armv7pmu_handle_irq,
+ .enable = armv7pmu_enable_event,
+ .disable = armv7pmu_disable_event,
+ .raw_event = armv7pmu_raw_event,
+ .read_counter = armv7pmu_read_counter,
+ .write_counter = armv7pmu_write_counter,
+ .get_event_idx = armv7pmu_get_event_idx,
+ .start = armv7pmu_start,
+ .stop = armv7pmu_stop,
+ .max_period = (1LLU << 32) - 1,
+};
+
+static u32 __init armv7_reset_read_pmnc(void)
+{
+ u32 nb_cnt;
+
+ /* Initialize & Reset PMNC: C and P bits */
+ armv7_pmnc_write(ARMV7_PMNC_P | ARMV7_PMNC_C);
+
+ /* Read the nb of CNTx counters supported from PMNC */
+ nb_cnt = (armv7_pmnc_read() >> ARMV7_PMNC_N_SHIFT) & ARMV7_PMNC_N_MASK;
+
+ /* Add the CPU cycles counter and return */
+ return nb_cnt + 1;
+}
+
+static int __init
+init_hw_perf_events(void)
+{
+ unsigned long cpuid = read_cpuid_id();
+ unsigned long implementor = (cpuid & 0xFF000000) >> 24;
+ unsigned long part_number = (cpuid & 0xFFF0);
+
+ /* We only support ARM CPUs implemented by ARM at the moment. */
+ if (0x41 == implementor) {
+ switch (part_number) {
+ case 0xB360: /* ARM1136 */
+ case 0xB560: /* ARM1156 */
+ case 0xB760: /* ARM1176 */
+ armpmu = &armv6pmu;
+ memcpy(armpmu_perf_cache_map, armv6_perf_cache_map,
+ sizeof(armv6_perf_cache_map));
+ perf_max_events = armv6pmu.num_events;
+ break;
+ case 0xB020: /* ARM11mpcore */
+ armpmu = &armv6mpcore_pmu;
+ memcpy(armpmu_perf_cache_map,
+ armv6mpcore_perf_cache_map,
+ sizeof(armv6mpcore_perf_cache_map));
+ perf_max_events = armv6mpcore_pmu.num_events;
+ break;
+ case 0xC080: /* Cortex-A8 */
+ armv7pmu.name = ARMV7_PMU_CORTEX_A8_NAME;
+ memcpy(armpmu_perf_cache_map, armv7_a8_perf_cache_map,
+ sizeof(armv7_a8_perf_cache_map));
+ armv7pmu.event_map = armv7_a8_pmu_event_map;
+ armpmu = &armv7pmu;
+
+ /* Reset PMNC and read the nb of CNTx counters
+ supported */
+ armv7pmu.num_events = armv7_reset_read_pmnc();
+ perf_max_events = armv7pmu.num_events;
+ break;
+ case 0xC090: /* Cortex-A9 */
+ armv7pmu.name = ARMV7_PMU_CORTEX_A9_NAME;
+ memcpy(armpmu_perf_cache_map, armv7_a9_perf_cache_map,
+ sizeof(armv7_a9_perf_cache_map));
+ armv7pmu.event_map = armv7_a9_pmu_event_map;
+ armpmu = &armv7pmu;
+
+ /* Reset PMNC and read the nb of CNTx counters
+ supported */
+ armv7pmu.num_events = armv7_reset_read_pmnc();
+ perf_max_events = armv7pmu.num_events;
+ break;
+ default:
+ pr_info("no hardware support available\n");
+ perf_max_events = -1;
+ }
+ }
+
+ if (armpmu)
+ pr_info("enabled with %s PMU driver, %d counters available\n",
+ armpmu->name, armpmu->num_events);
+
+ return 0;
+}
+arch_initcall(init_hw_perf_events);
+
+/*
+ * Callchain handling code.
+ */
+static inline void
+callchain_store(struct perf_callchain_entry *entry,
+ u64 ip)
+{
+ if (entry->nr < PERF_MAX_STACK_DEPTH)
+ entry->ip[entry->nr++] = ip;
+}
+
+/*
+ * The registers we're interested in are at the end of the variable
+ * length saved register structure. The fp points at the end of this
+ * structure so the address of this struct is:
+ * (struct frame_tail *)(xxx->fp)-1
+ *
+ * This code has been adapted from the ARM OProfile support.
+ */
+struct frame_tail {
+ struct frame_tail *fp;
+ unsigned long sp;
+ unsigned long lr;
+} __attribute__((packed));
+
+/*
+ * Get the return address for a single stackframe and return a pointer to the
+ * next frame tail.
+ */
+static struct frame_tail *
+user_backtrace(struct frame_tail *tail,
+ struct perf_callchain_entry *entry)
+{
+ struct frame_tail buftail;
+
+ /* Also check accessibility of one struct frame_tail beyond */
+ if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
+ return NULL;
+ if (__copy_from_user_inatomic(&buftail, tail, sizeof(buftail)))
+ return NULL;
+
+ callchain_store(entry, buftail.lr);
+
+ /*
+ * Frame pointers should strictly progress back up the stack
+ * (towards higher addresses).
+ */
+ if (tail >= buftail.fp)
+ return NULL;
+
+ return buftail.fp - 1;
+}
+
+static void
+perf_callchain_user(struct pt_regs *regs,
+ struct perf_callchain_entry *entry)
+{
+ struct frame_tail *tail;
+
+ callchain_store(entry, PERF_CONTEXT_USER);
+
+ if (!user_mode(regs))
+ regs = task_pt_regs(current);
+
+ tail = (struct frame_tail *)regs->ARM_fp - 1;
+
+ while (tail && !((unsigned long)tail & 0x3))
+ tail = user_backtrace(tail, entry);
+}
+
+/*
+ * Gets called by walk_stackframe() for every stackframe. This will be called
+ * whist unwinding the stackframe and is like a subroutine return so we use
+ * the PC.
+ */
+static int
+callchain_trace(struct stackframe *fr,
+ void *data)
+{
+ struct perf_callchain_entry *entry = data;
+ callchain_store(entry, fr->pc);
+ return 0;
+}
+
+static void
+perf_callchain_kernel(struct pt_regs *regs,
+ struct perf_callchain_entry *entry)
+{
+ struct stackframe fr;
+
+ callchain_store(entry, PERF_CONTEXT_KERNEL);
+ fr.fp = regs->ARM_fp;
+ fr.sp = regs->ARM_sp;
+ fr.lr = regs->ARM_lr;
+ fr.pc = regs->ARM_pc;
+ walk_stackframe(&fr, callchain_trace, entry);
+}
+
+static void
+perf_do_callchain(struct pt_regs *regs,
+ struct perf_callchain_entry *entry)
+{
+ int is_user;
+
+ if (!regs)
+ return;
+
+ is_user = user_mode(regs);
+
+ if (!current || !current->pid)
+ return;
+
+ if (is_user && current->state != TASK_RUNNING)
+ return;
+
+ if (!is_user)
+ perf_callchain_kernel(regs, entry);
+
+ if (current->mm)
+ perf_callchain_user(regs, entry);
+}
+
+static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry);
+
+struct perf_callchain_entry *
+perf_callchain(struct pt_regs *regs)
+{
+ struct perf_callchain_entry *entry = &__get_cpu_var(pmc_irq_entry);
+
+ entry->nr = 0;
+ perf_do_callchain(regs, entry);
+ return entry;
+}
diff --git a/arch/arm/kernel/pmu.c b/arch/arm/kernel/pmu.c
new file mode 100644
index 000000000000..a124312e343f
--- /dev/null
+++ b/arch/arm/kernel/pmu.c
@@ -0,0 +1,103 @@
+/*
+ * linux/arch/arm/kernel/pmu.c
+ *
+ * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
+ *
+ * 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/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/pmu.h>
+
+/*
+ * Define the IRQs for the system. We could use something like a platform
+ * device but that seems fairly heavyweight for this. Also, the performance
+ * counters can't be removed or hotplugged.
+ *
+ * Ordering is important: init_pmu() will use the ordering to set the affinity
+ * to the corresponding core. e.g. the first interrupt will go to cpu 0, the
+ * second goes to cpu 1 etc.
+ */
+static const int irqs[] = {
+#if defined(CONFIG_ARCH_OMAP2)
+ 3,
+#elif defined(CONFIG_ARCH_BCMRING)
+ IRQ_PMUIRQ,
+#elif defined(CONFIG_MACH_REALVIEW_EB)
+ IRQ_EB11MP_PMU_CPU0,
+ IRQ_EB11MP_PMU_CPU1,
+ IRQ_EB11MP_PMU_CPU2,
+ IRQ_EB11MP_PMU_CPU3,
+#elif defined(CONFIG_ARCH_OMAP3)
+ INT_34XX_BENCH_MPU_EMUL,
+#elif defined(CONFIG_ARCH_IOP32X)
+ IRQ_IOP32X_CORE_PMU,
+#elif defined(CONFIG_ARCH_IOP33X)
+ IRQ_IOP33X_CORE_PMU,
+#elif defined(CONFIG_ARCH_PXA)
+ IRQ_PMU,
+#endif
+};
+
+static const struct pmu_irqs pmu_irqs = {
+ .irqs = irqs,
+ .num_irqs = ARRAY_SIZE(irqs),
+};
+
+static volatile long pmu_lock;
+
+const struct pmu_irqs *
+reserve_pmu(void)
+{
+ return test_and_set_bit_lock(0, &pmu_lock) ? ERR_PTR(-EBUSY) :
+ &pmu_irqs;
+}
+EXPORT_SYMBOL_GPL(reserve_pmu);
+
+int
+release_pmu(const struct pmu_irqs *irqs)
+{
+ if (WARN_ON(irqs != &pmu_irqs))
+ return -EINVAL;
+ clear_bit_unlock(0, &pmu_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(release_pmu);
+
+static int
+set_irq_affinity(int irq,
+ unsigned int cpu)
+{
+#ifdef CONFIG_SMP
+ int err = irq_set_affinity(irq, cpumask_of(cpu));
+ if (err)
+ pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
+ irq, cpu);
+ return err;
+#else
+ return 0;
+#endif
+}
+
+int
+init_pmu(void)
+{
+ int i, err = 0;
+
+ for (i = 0; i < pmu_irqs.num_irqs; ++i) {
+ err = set_irq_affinity(pmu_irqs.irqs[i], i);
+ if (err)
+ break;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(init_pmu);
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 10e06801afb3..9d40c341e07e 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -18,6 +18,7 @@
#include <linux/page-flags.h>
#include <linux/sched.h>
#include <linux/highmem.h>
+#include <linux/perf_event.h>
#include <asm/system.h>
#include <asm/pgtable.h>
@@ -302,6 +303,12 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
fault = __do_page_fault(mm, addr, fsr, tsk);
up_read(&mm->mmap_sem);
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, addr);
+ if (fault & VM_FAULT_MAJOR)
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0, regs, addr);
+ else if (fault & VM_FAULT_MINOR)
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0, regs, addr);
+
/*
* Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
*/
diff --git a/arch/arm/oprofile/op_model_arm11_core.c b/arch/arm/oprofile/op_model_arm11_core.c
index ad80752cb9fb..ef3e2653b90c 100644
--- a/arch/arm/oprofile/op_model_arm11_core.c
+++ b/arch/arm/oprofile/op_model_arm11_core.c
@@ -132,7 +132,7 @@ static irqreturn_t arm11_pmu_interrupt(int irq, void *arg)
return IRQ_HANDLED;
}
-int arm11_request_interrupts(int *irqs, int nr)
+int arm11_request_interrupts(const int *irqs, int nr)
{
unsigned int i;
int ret = 0;
@@ -153,7 +153,7 @@ int arm11_request_interrupts(int *irqs, int nr)
return ret;
}
-void arm11_release_interrupts(int *irqs, int nr)
+void arm11_release_interrupts(const int *irqs, int nr)
{
unsigned int i;
diff --git a/arch/arm/oprofile/op_model_arm11_core.h b/arch/arm/oprofile/op_model_arm11_core.h
index 6f8538e5a960..1902b99d9dfd 100644
--- a/arch/arm/oprofile/op_model_arm11_core.h
+++ b/arch/arm/oprofile/op_model_arm11_core.h
@@ -39,7 +39,7 @@
int arm11_setup_pmu(void);
int arm11_start_pmu(void);
int arm11_stop_pmu(void);
-int arm11_request_interrupts(int *, int);
-void arm11_release_interrupts(int *, int);
+int arm11_request_interrupts(const int *, int);
+void arm11_release_interrupts(const int *, int);
#endif
diff --git a/arch/arm/oprofile/op_model_mpcore.c b/arch/arm/oprofile/op_model_mpcore.c
index 4ce0f9801e2e..f73ce875a395 100644
--- a/arch/arm/oprofile/op_model_mpcore.c
+++ b/arch/arm/oprofile/op_model_mpcore.c
@@ -32,6 +32,7 @@
/* #define DEBUG */
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/sched.h>
#include <linux/oprofile.h>
#include <linux/interrupt.h>
@@ -43,6 +44,7 @@
#include <mach/hardware.h>
#include <mach/board-eb.h>
#include <asm/system.h>
+#include <asm/pmu.h>
#include "op_counter.h"
#include "op_arm_model.h"
@@ -58,6 +60,7 @@
* Bitmask of used SCU counters
*/
static unsigned int scu_em_used;
+static const struct pmu_irqs *pmu_irqs;
/*
* 2 helper fns take a counter number from 0-7 (not the userspace-visible counter number)
@@ -225,33 +228,40 @@ static int em_setup_ctrs(void)
return 0;
}
-static int arm11_irqs[] = {
- [0] = IRQ_EB11MP_PMU_CPU0,
- [1] = IRQ_EB11MP_PMU_CPU1,
- [2] = IRQ_EB11MP_PMU_CPU2,
- [3] = IRQ_EB11MP_PMU_CPU3
-};
-
static int em_start(void)
{
int ret;
- ret = arm11_request_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ pmu_irqs = reserve_pmu();
+ if (IS_ERR(pmu_irqs)) {
+ ret = PTR_ERR(pmu_irqs);
+ goto out;
+ }
+
+ ret = arm11_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
if (ret == 0) {
em_call_function(arm11_start_pmu);
ret = scu_start();
- if (ret)
- arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ if (ret) {
+ arm11_release_interrupts(pmu_irqs->irqs,
+ pmu_irqs->num_irqs);
+ } else {
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
+ }
}
+
+out:
return ret;
}
static void em_stop(void)
{
em_call_function(arm11_stop_pmu);
- arm11_release_interrupts(arm11_irqs, ARRAY_SIZE(arm11_irqs));
+ arm11_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
scu_stop();
+ release_pmu(pmu_irqs);
}
/*
@@ -283,15 +293,7 @@ static int em_setup(void)
em_route_irq(IRQ_EB11MP_PMU_SCU6, 3);
em_route_irq(IRQ_EB11MP_PMU_SCU7, 3);
- /*
- * Send CP15 PMU interrupts to the owner CPU.
- */
- em_route_irq(IRQ_EB11MP_PMU_CPU0, 0);
- em_route_irq(IRQ_EB11MP_PMU_CPU1, 1);
- em_route_irq(IRQ_EB11MP_PMU_CPU2, 2);
- em_route_irq(IRQ_EB11MP_PMU_CPU3, 3);
-
- return 0;
+ return init_pmu();
}
struct op_arm_model_spec op_mpcore_spec = {
diff --git a/arch/arm/oprofile/op_model_v6.c b/arch/arm/oprofile/op_model_v6.c
index f7d2ec5ee9a1..a22357a2fd08 100644
--- a/arch/arm/oprofile/op_model_v6.c
+++ b/arch/arm/oprofile/op_model_v6.c
@@ -19,39 +19,47 @@
/* #define DEBUG */
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/sched.h>
#include <linux/oprofile.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include <asm/system.h>
+#include <asm/pmu.h>
#include "op_counter.h"
#include "op_arm_model.h"
#include "op_model_arm11_core.h"
-static int irqs[] = {
-#ifdef CONFIG_ARCH_OMAP2
- 3,
-#endif
-#ifdef CONFIG_ARCH_BCMRING
- IRQ_PMUIRQ, /* for BCMRING, ARM PMU interrupt is 43 */
-#endif
-};
+static const struct pmu_irqs *pmu_irqs;
static void armv6_pmu_stop(void)
{
arm11_stop_pmu();
- arm11_release_interrupts(irqs, ARRAY_SIZE(irqs));
+ arm11_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
}
static int armv6_pmu_start(void)
{
int ret;
- ret = arm11_request_interrupts(irqs, ARRAY_SIZE(irqs));
- if (ret >= 0)
+ pmu_irqs = reserve_pmu();
+ if (IS_ERR(pmu_irqs)) {
+ ret = PTR_ERR(pmu_irqs);
+ goto out;
+ }
+
+ ret = arm11_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+ if (ret >= 0) {
ret = arm11_start_pmu();
+ } else {
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
+ }
+out:
return ret;
}
diff --git a/arch/arm/oprofile/op_model_v7.c b/arch/arm/oprofile/op_model_v7.c
index 2088a6c0cc0e..8642d0891ae1 100644
--- a/arch/arm/oprofile/op_model_v7.c
+++ b/arch/arm/oprofile/op_model_v7.c
@@ -11,11 +11,14 @@
*/
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/oprofile.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/smp.h>
+#include <asm/pmu.h>
+
#include "op_counter.h"
#include "op_arm_model.h"
#include "op_model_v7.h"
@@ -295,7 +298,7 @@ static irqreturn_t armv7_pmnc_interrupt(int irq, void *arg)
return IRQ_HANDLED;
}
-int armv7_request_interrupts(int *irqs, int nr)
+int armv7_request_interrupts(const int *irqs, int nr)
{
unsigned int i;
int ret = 0;
@@ -318,7 +321,7 @@ int armv7_request_interrupts(int *irqs, int nr)
return ret;
}
-void armv7_release_interrupts(int *irqs, int nr)
+void armv7_release_interrupts(const int *irqs, int nr)
{
unsigned int i;
@@ -362,12 +365,7 @@ static void armv7_pmnc_dump_regs(void)
}
#endif
-
-static int irqs[] = {
-#ifdef CONFIG_ARCH_OMAP3
- INT_34XX_BENCH_MPU_EMUL,
-#endif
-};
+static const struct pmu_irqs *pmu_irqs;
static void armv7_pmnc_stop(void)
{
@@ -375,19 +373,29 @@ static void armv7_pmnc_stop(void)
armv7_pmnc_dump_regs();
#endif
armv7_stop_pmnc();
- armv7_release_interrupts(irqs, ARRAY_SIZE(irqs));
+ armv7_release_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
}
static int armv7_pmnc_start(void)
{
int ret;
+ pmu_irqs = reserve_pmu();
+ if (IS_ERR(pmu_irqs))
+ return PTR_ERR(pmu_irqs);
+
#ifdef DEBUG
armv7_pmnc_dump_regs();
#endif
- ret = armv7_request_interrupts(irqs, ARRAY_SIZE(irqs));
- if (ret >= 0)
+ ret = armv7_request_interrupts(pmu_irqs->irqs, pmu_irqs->num_irqs);
+ if (ret >= 0) {
armv7_start_pmnc();
+ } else {
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
+ }
return ret;
}
diff --git a/arch/arm/oprofile/op_model_v7.h b/arch/arm/oprofile/op_model_v7.h
index 0e19bcc2e100..9ca334b39c75 100644
--- a/arch/arm/oprofile/op_model_v7.h
+++ b/arch/arm/oprofile/op_model_v7.h
@@ -97,7 +97,7 @@
int armv7_setup_pmu(void);
int armv7_start_pmu(void);
int armv7_stop_pmu(void);
-int armv7_request_interrupts(int *, int);
-void armv7_release_interrupts(int *, int);
+int armv7_request_interrupts(const int *, int);
+void armv7_release_interrupts(const int *, int);
#endif
diff --git a/arch/arm/oprofile/op_model_xscale.c b/arch/arm/oprofile/op_model_xscale.c
index 724ab9ce2526..1d34a02048bd 100644
--- a/arch/arm/oprofile/op_model_xscale.c
+++ b/arch/arm/oprofile/op_model_xscale.c
@@ -17,12 +17,14 @@
/* #define DEBUG */
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/sched.h>
#include <linux/oprofile.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/cputype.h>
+#include <asm/pmu.h>
#include "op_counter.h"
#include "op_arm_model.h"
@@ -33,17 +35,6 @@
#define PMU_RESET (CCNT_RESET | PMN_RESET)
#define PMU_CNT64 0x008 /* Make CCNT count every 64th cycle */
-/* TODO do runtime detection */
-#ifdef CONFIG_ARCH_IOP32X
-#define XSCALE_PMU_IRQ IRQ_IOP32X_CORE_PMU
-#endif
-#ifdef CONFIG_ARCH_IOP33X
-#define XSCALE_PMU_IRQ IRQ_IOP33X_CORE_PMU
-#endif
-#ifdef CONFIG_ARCH_PXA
-#define XSCALE_PMU_IRQ IRQ_PMU
-#endif
-
/*
* Different types of events that can be counted by the XScale PMU
* as used by Oprofile userspace. Here primarily for documentation
@@ -367,6 +358,8 @@ static irqreturn_t xscale_pmu_interrupt(int irq, void *arg)
return IRQ_HANDLED;
}
+static const struct pmu_irqs *pmu_irqs;
+
static void xscale_pmu_stop(void)
{
u32 pmnc = read_pmnc();
@@ -374,20 +367,30 @@ static void xscale_pmu_stop(void)
pmnc &= ~PMU_ENABLE;
write_pmnc(pmnc);
- free_irq(XSCALE_PMU_IRQ, results);
+ free_irq(pmu_irqs->irqs[0], results);
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
}
static int xscale_pmu_start(void)
{
int ret;
- u32 pmnc = read_pmnc();
+ u32 pmnc;
+
+ pmu_irqs = reserve_pmu();
+ if (IS_ERR(pmu_irqs))
+ return PTR_ERR(pmu_irqs);
+
+ pmnc = read_pmnc();
- ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, IRQF_DISABLED,
- "XScale PMU", (void *)results);
+ ret = request_irq(pmu_irqs->irqs[0], xscale_pmu_interrupt,
+ IRQF_DISABLED, "XScale PMU", (void *)results);
if (ret < 0) {
printk(KERN_ERR "oprofile: unable to request IRQ%d for XScale PMU\n",
- XSCALE_PMU_IRQ);
+ pmu_irqs->irqs[0]);
+ release_pmu(pmu_irqs);
+ pmu_irqs = NULL;
return ret;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 03:36:16 +0100