1 files changed, 0 insertions, 557 deletions
diff --git a/arch/sparc/kernel/perf_counter.c b/arch/sparc/kernel/perf_counter.c
deleted file mode 100644
index 09de4035eaa9..000000000000
--- a/arch/sparc/kernel/perf_counter.c
+++ /dev/null
@@ -1,557 +0,0 @@
-/* Performance counter support for sparc64.
- *
- * Copyright (C) 2009 David S. Miller <davem@davemloft.net>
- *
- * This code is based almost entirely upon the x86 perf counter
- * code, which is:
- *
- *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
- *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
- *  Copyright (C) 2009 Jaswinder Singh Rajput
- *  Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter
- *  Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
- */
-
-#include <linux/perf_counter.h>
-#include <linux/kprobes.h>
-#include <linux/kernel.h>
-#include <linux/kdebug.h>
-#include <linux/mutex.h>
-
-#include <asm/cpudata.h>
-#include <asm/atomic.h>
-#include <asm/nmi.h>
-#include <asm/pcr.h>
-
-/* Sparc64 chips have two performance counters, 32-bits each, with
- * overflow interrupts generated on transition from 0xffffffff to 0.
- * The counters are accessed in one go using a 64-bit register.
- *
- * Both counters are controlled using a single control register.  The
- * only way to stop all sampling is to clear all of the context (user,
- * supervisor, hypervisor) sampling enable bits.  But these bits apply
- * to both counters, thus the two counters can't be enabled/disabled
- * individually.
- *
- * The control register has two event fields, one for each of the two
- * counters.  It's thus nearly impossible to have one counter going
- * while keeping the other one stopped.  Therefore it is possible to
- * get overflow interrupts for counters not currently "in use" and
- * that condition must be checked in the overflow interrupt handler.
- *
- * So we use a hack, in that we program inactive counters with the
- * "sw_count0" and "sw_count1" events.  These count how many times
- * the instruction "sethi %hi(0xfc000), %g0" is executed.  It's an
- * unusual way to encode a NOP and therefore will not trigger in
- * normal code.
- */
-
-#define MAX_HWCOUNTERS			2
-#define MAX_PERIOD			((1UL << 32) - 1)
-
-#define PIC_UPPER_INDEX			0
-#define PIC_LOWER_INDEX			1
-
-struct cpu_hw_counters {
-	struct perf_counter	*counters[MAX_HWCOUNTERS];
-	unsigned long		used_mask[BITS_TO_LONGS(MAX_HWCOUNTERS)];
-	unsigned long		active_mask[BITS_TO_LONGS(MAX_HWCOUNTERS)];
-	int enabled;
-};
-DEFINE_PER_CPU(struct cpu_hw_counters, cpu_hw_counters) = { .enabled = 1, };
-
-struct perf_event_map {
-	u16	encoding;
-	u8	pic_mask;
-#define PIC_NONE	0x00
-#define PIC_UPPER	0x01
-#define PIC_LOWER	0x02
-};
-
-struct sparc_pmu {
-	const struct perf_event_map	*(*event_map)(int);
-	int				max_events;
-	int				upper_shift;
-	int				lower_shift;
-	int				event_mask;
-	int				hv_bit;
-	int				irq_bit;
-	int				upper_nop;
-	int				lower_nop;
-};
-
-static const struct perf_event_map ultra3i_perfmon_event_map[] = {
-	[PERF_COUNT_HW_CPU_CYCLES] = { 0x0000, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_INSTRUCTIONS] = { 0x0001, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0009, PIC_LOWER },
-	[PERF_COUNT_HW_CACHE_MISSES] = { 0x0009, PIC_UPPER },
-};
-
-static const struct perf_event_map *ultra3i_event_map(int event)
-{
-	return &ultra3i_perfmon_event_map[event];
-}
-
-static const struct sparc_pmu ultra3i_pmu = {
-	.event_map	= ultra3i_event_map,
-	.max_events	= ARRAY_SIZE(ultra3i_perfmon_event_map),
-	.upper_shift	= 11,
-	.lower_shift	= 4,
-	.event_mask	= 0x3f,
-	.upper_nop	= 0x1c,
-	.lower_nop	= 0x14,
-};
-
-static const struct perf_event_map niagara2_perfmon_event_map[] = {
-	[PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0208, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_CACHE_MISSES] = { 0x0302, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x0201, PIC_UPPER | PIC_LOWER },
-	[PERF_COUNT_HW_BRANCH_MISSES] = { 0x0202, PIC_UPPER | PIC_LOWER },
-};
-
-static const struct perf_event_map *niagara2_event_map(int event)
-{
-	return &niagara2_perfmon_event_map[event];
-}
-
-static const struct sparc_pmu niagara2_pmu = {
-	.event_map	= niagara2_event_map,
-	.max_events	= ARRAY_SIZE(niagara2_perfmon_event_map),
-	.upper_shift	= 19,
-	.lower_shift	= 6,
-	.event_mask	= 0xfff,
-	.hv_bit		= 0x8,
-	.irq_bit	= 0x03,
-	.upper_nop	= 0x220,
-	.lower_nop	= 0x220,
-};
-
-static const struct sparc_pmu *sparc_pmu __read_mostly;
-
-static u64 event_encoding(u64 event, int idx)
-{
-	if (idx == PIC_UPPER_INDEX)
-		event <<= sparc_pmu->upper_shift;
-	else
-		event <<= sparc_pmu->lower_shift;
-	return event;
-}
-
-static u64 mask_for_index(int idx)
-{
-	return event_encoding(sparc_pmu->event_mask, idx);
-}
-
-static u64 nop_for_index(int idx)
-{
-	return event_encoding(idx == PIC_UPPER_INDEX ?
-			      sparc_pmu->upper_nop :
-			      sparc_pmu->lower_nop, idx);
-}
-
-static inline void sparc_pmu_enable_counter(struct hw_perf_counter *hwc,
-					    int idx)
-{
-	u64 val, mask = mask_for_index(idx);
-
-	val = pcr_ops->read();
-	pcr_ops->write((val & ~mask) | hwc->config);
-}
-
-static inline void sparc_pmu_disable_counter(struct hw_perf_counter *hwc,
-					     int idx)
-{
-	u64 mask = mask_for_index(idx);
-	u64 nop = nop_for_index(idx);
-	u64 val = pcr_ops->read();
-
-	pcr_ops->write((val & ~mask) | nop);
-}
-
-void hw_perf_enable(void)
-{
-	struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-	u64 val;
-	int i;
-
-	if (cpuc->enabled)
-		return;
-
-	cpuc->enabled = 1;
-	barrier();
-
-	val = pcr_ops->read();
-
-	for (i = 0; i < MAX_HWCOUNTERS; i++) {
-		struct perf_counter *cp = cpuc->counters[i];
-		struct hw_perf_counter *hwc;
-
-		if (!cp)
-			continue;
-		hwc = &cp->hw;
-		val |= hwc->config_base;
-	}
-
-	pcr_ops->write(val);
-}
-
-void hw_perf_disable(void)
-{
-	struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-	u64 val;
-
-	if (!cpuc->enabled)
-		return;
-
-	cpuc->enabled = 0;
-
-	val = pcr_ops->read();
-	val &= ~(PCR_UTRACE | PCR_STRACE |
-		 sparc_pmu->hv_bit | sparc_pmu->irq_bit);
-	pcr_ops->write(val);
-}
-
-static u32 read_pmc(int idx)
-{
-	u64 val;
-
-	read_pic(val);
-	if (idx == PIC_UPPER_INDEX)
-		val >>= 32;
-
-	return val & 0xffffffff;
-}
-
-static void write_pmc(int idx, u64 val)
-{
-	u64 shift, mask, pic;
-
-	shift = 0;
-	if (idx == PIC_UPPER_INDEX)
-		shift = 32;
-
-	mask = ((u64) 0xffffffff) << shift;
-	val <<= shift;
-
-	read_pic(pic);
-	pic &= ~mask;
-	pic |= val;
-	write_pic(pic);
-}
-
-static int sparc_perf_counter_set_period(struct perf_counter *counter,
-					 struct hw_perf_counter *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 > MAX_PERIOD)
-		left = MAX_PERIOD;
-
-	atomic64_set(&hwc->prev_count, (u64)-left);
-
-	write_pmc(idx, (u64)(-left) & 0xffffffff);
-
-	perf_counter_update_userpage(counter);
-
-	return ret;
-}
-
-static int sparc_pmu_enable(struct perf_counter *counter)
-{
-	struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-	struct hw_perf_counter *hwc = &counter->hw;
-	int idx = hwc->idx;
-
-	if (test_and_set_bit(idx, cpuc->used_mask))
-		return -EAGAIN;
-
-	sparc_pmu_disable_counter(hwc, idx);
-
-	cpuc->counters[idx] = counter;
-	set_bit(idx, cpuc->active_mask);
-
-	sparc_perf_counter_set_period(counter, hwc, idx);
-	sparc_pmu_enable_counter(hwc, idx);
-	perf_counter_update_userpage(counter);
-	return 0;
-}
-
-static u64 sparc_perf_counter_update(struct perf_counter *counter,
-				     struct hw_perf_counter *hwc, int idx)
-{
-	int shift = 64 - 32;
-	u64 prev_raw_count, new_raw_count;
-	s64 delta;
-
-again:
-	prev_raw_count = atomic64_read(&hwc->prev_count);
-	new_raw_count = read_pmc(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, &counter->count);
-	atomic64_sub(delta, &hwc->period_left);
-
-	return new_raw_count;
-}
-
-static void sparc_pmu_disable(struct perf_counter *counter)
-{
-	struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-	struct hw_perf_counter *hwc = &counter->hw;
-	int idx = hwc->idx;
-
-	clear_bit(idx, cpuc->active_mask);
-	sparc_pmu_disable_counter(hwc, idx);
-
-	barrier();
-
-	sparc_perf_counter_update(counter, hwc, idx);
-	cpuc->counters[idx] = NULL;
-	clear_bit(idx, cpuc->used_mask);
-
-	perf_counter_update_userpage(counter);
-}
-
-static void sparc_pmu_read(struct perf_counter *counter)
-{
-	struct hw_perf_counter *hwc = &counter->hw;
-	sparc_perf_counter_update(counter, hwc, hwc->idx);
-}
-
-static void sparc_pmu_unthrottle(struct perf_counter *counter)
-{
-	struct hw_perf_counter *hwc = &counter->hw;
-	sparc_pmu_enable_counter(hwc, hwc->idx);
-}
-
-static atomic_t active_counters = ATOMIC_INIT(0);
-static DEFINE_MUTEX(pmc_grab_mutex);
-
-void perf_counter_grab_pmc(void)
-{
-	if (atomic_inc_not_zero(&active_counters))
-		return;
-
-	mutex_lock(&pmc_grab_mutex);
-	if (atomic_read(&active_counters) == 0) {
-		if (atomic_read(&nmi_active) > 0) {
-			on_each_cpu(stop_nmi_watchdog, NULL, 1);
-			BUG_ON(atomic_read(&nmi_active) != 0);
-		}
-		atomic_inc(&active_counters);
-	}
-	mutex_unlock(&pmc_grab_mutex);
-}
-
-void perf_counter_release_pmc(void)
-{
-	if (atomic_dec_and_mutex_lock(&active_counters, &pmc_grab_mutex)) {
-		if (atomic_read(&nmi_active) == 0)
-			on_each_cpu(start_nmi_watchdog, NULL, 1);
-		mutex_unlock(&pmc_grab_mutex);
-	}
-}
-
-static void hw_perf_counter_destroy(struct perf_counter *counter)
-{
-	perf_counter_release_pmc();
-}
-
-static int __hw_perf_counter_init(struct perf_counter *counter)
-{
-	struct perf_counter_attr *attr = &counter->attr;
-	struct hw_perf_counter *hwc = &counter->hw;
-	const struct perf_event_map *pmap;
-	u64 enc;
-
-	if (atomic_read(&nmi_active) < 0)
-		return -ENODEV;
-
-	if (attr->type != PERF_TYPE_HARDWARE)
-		return -EOPNOTSUPP;
-
-	if (attr->config >= sparc_pmu->max_events)
-		return -EINVAL;
-
-	perf_counter_grab_pmc();
-	counter->destroy = hw_perf_counter_destroy;
-
-	/* We save the enable bits in the config_base.  So to
-	 * turn off sampling just write 'config', and to enable
-	 * things write 'config | config_base'.
-	 */
-	hwc->config_base = sparc_pmu->irq_bit;
-	if (!attr->exclude_user)
-		hwc->config_base |= PCR_UTRACE;
-	if (!attr->exclude_kernel)
-		hwc->config_base |= PCR_STRACE;
-	if (!attr->exclude_hv)
-		hwc->config_base |= sparc_pmu->hv_bit;
-
-	if (!hwc->sample_period) {
-		hwc->sample_period = MAX_PERIOD;
-		hwc->last_period = hwc->sample_period;
-		atomic64_set(&hwc->period_left, hwc->sample_period);
-	}
-
-	pmap = sparc_pmu->event_map(attr->config);
-
-	enc = pmap->encoding;
-	if (pmap->pic_mask & PIC_UPPER) {
-		hwc->idx = PIC_UPPER_INDEX;
-		enc <<= sparc_pmu->upper_shift;
-	} else {
-		hwc->idx = PIC_LOWER_INDEX;
-		enc <<= sparc_pmu->lower_shift;
-	}
-
-	hwc->config |= enc;
-	return 0;
-}
-
-static const struct pmu pmu = {
-	.enable		= sparc_pmu_enable,
-	.disable	= sparc_pmu_disable,
-	.read		= sparc_pmu_read,
-	.unthrottle	= sparc_pmu_unthrottle,
-};
-
-const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
-{
-	int err = __hw_perf_counter_init(counter);
-
-	if (err)
-		return ERR_PTR(err);
-	return &pmu;
-}
-
-void perf_counter_print_debug(void)
-{
-	unsigned long flags;
-	u64 pcr, pic;
-	int cpu;
-
-	if (!sparc_pmu)
-		return;
-
-	local_irq_save(flags);
-
-	cpu = smp_processor_id();
-
-	pcr = pcr_ops->read();
-	read_pic(pic);
-
-	pr_info("\n");
-	pr_info("CPU#%d: PCR[%016llx] PIC[%016llx]\n",
-		cpu, pcr, pic);
-
-	local_irq_restore(flags);
-}
-
-static int __kprobes perf_counter_nmi_handler(struct notifier_block *self,
-					      unsigned long cmd, void *__args)
-{
-	struct die_args *args = __args;
-	struct perf_sample_data data;
-	struct cpu_hw_counters *cpuc;
-	struct pt_regs *regs;
-	int idx;
-
-	if (!atomic_read(&active_counters))
-		return NOTIFY_DONE;
-
-	switch (cmd) {
-	case DIE_NMI:
-		break;
-
-	default:
-		return NOTIFY_DONE;
-	}
-
-	regs = args->regs;
-
-	data.regs = regs;
-	data.addr = 0;
-
-	cpuc = &__get_cpu_var(cpu_hw_counters);
-	for (idx = 0; idx < MAX_HWCOUNTERS; idx++) {
-		struct perf_counter *counter = cpuc->counters[idx];
-		struct hw_perf_counter *hwc;
-		u64 val;
-
-		if (!test_bit(idx, cpuc->active_mask))
-			continue;
-		hwc = &counter->hw;
-		val = sparc_perf_counter_update(counter, hwc, idx);
-		if (val & (1ULL << 31))
-			continue;
-
-		data.period = counter->hw.last_period;
-		if (!sparc_perf_counter_set_period(counter, hwc, idx))
-			continue;
-
-		if (perf_counter_overflow(counter, 1, &data))
-			sparc_pmu_disable_counter(hwc, idx);
-	}
-
-	return NOTIFY_STOP;
-}
-
-static __read_mostly struct notifier_block perf_counter_nmi_notifier = {
-	.notifier_call		= perf_counter_nmi_handler,
-};
-
-static bool __init supported_pmu(void)
-{
-	if (!strcmp(sparc_pmu_type, "ultra3i")) {
-		sparc_pmu = &ultra3i_pmu;
-		return true;
-	}
-	if (!strcmp(sparc_pmu_type, "niagara2")) {
-		sparc_pmu = &niagara2_pmu;
-		return true;
-	}
-	return false;
-}
-
-void __init init_hw_perf_counters(void)
-{
-	pr_info("Performance counters: ");
-
-	if (!supported_pmu()) {
-		pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
-		return;
-	}
-
-	pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type);
-
-	/* All sparc64 PMUs currently have 2 counters.  But this simple
-	 * driver only supports one active counter at a time.
-	 */
-	perf_max_counters = 1;
-
-	register_die_notifier(&perf_counter_nmi_notifier);
-}