1 files changed, 0 insertions, 1500 deletions

diff --git a/arch/nds32/kernel/perf_event_cpu.c b/arch/nds32/kernel/perf_event_cpu.c
deleted file mode 100644
index a78a879e7ef1..000000000000
--- a/arch/nds32/kernel/perf_event_cpu.c
+++ /dev/null
@@ -1,1500 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2008-2017 Andes Technology Corporation
- *
- * Reference ARMv7: Jean Pihet <jpihet@mvista.com>
- * 2010 (c) MontaVista Software, LLC.
- */
-
-#include <linux/perf_event.h>
-#include <linux/bitmap.h>
-#include <linux/export.h>
-#include <linux/kernel.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/pm_runtime.h>
-#include <linux/ftrace.h>
-#include <linux/uaccess.h>
-#include <linux/sched/clock.h>
-#include <linux/percpu-defs.h>
-
-#include <asm/pmu.h>
-#include <asm/irq_regs.h>
-#include <asm/nds32.h>
-#include <asm/stacktrace.h>
-#include <asm/perf_event.h>
-#include <nds32_intrinsic.h>
-
-/* Set at runtime when we know what CPU type we are. */
-static struct nds32_pmu *cpu_pmu;
-
-static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
-static void nds32_pmu_start(struct nds32_pmu *cpu_pmu);
-static void nds32_pmu_stop(struct nds32_pmu *cpu_pmu);
-static struct platform_device_id cpu_pmu_plat_device_ids[] = {
-	{.name = "nds32-pfm"},
-	{},
-};
-
-static int nds32_pmu_map_cache_event(const unsigned int (*cache_map)
-				  [PERF_COUNT_HW_CACHE_MAX]
-				  [PERF_COUNT_HW_CACHE_OP_MAX]
-				  [PERF_COUNT_HW_CACHE_RESULT_MAX], 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)(*cache_map)[cache_type][cache_op][cache_result];
-
-	if (ret == CACHE_OP_UNSUPPORTED)
-		return -ENOENT;
-
-	return ret;
-}
-
-static int
-nds32_pmu_map_hw_event(const unsigned int (*event_map)[PERF_COUNT_HW_MAX],
-		       u64 config)
-{
-	int mapping;
-
-	if (config >= PERF_COUNT_HW_MAX)
-		return -ENOENT;
-
-	mapping = (*event_map)[config];
-	return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
-}
-
-static int nds32_pmu_map_raw_event(u32 raw_event_mask, u64 config)
-{
-	int ev_type = (int)(config & raw_event_mask);
-	int idx = config >> 8;
-
-	switch (idx) {
-	case 0:
-		ev_type = PFM_OFFSET_MAGIC_0 + ev_type;
-		if (ev_type >= SPAV3_0_SEL_LAST || ev_type <= SPAV3_0_SEL_BASE)
-			return -ENOENT;
-		break;
-	case 1:
-		ev_type = PFM_OFFSET_MAGIC_1 + ev_type;
-		if (ev_type >= SPAV3_1_SEL_LAST || ev_type <= SPAV3_1_SEL_BASE)
-			return -ENOENT;
-		break;
-	case 2:
-		ev_type = PFM_OFFSET_MAGIC_2 + ev_type;
-		if (ev_type >= SPAV3_2_SEL_LAST || ev_type <= SPAV3_2_SEL_BASE)
-			return -ENOENT;
-		break;
-	default:
-		return -ENOENT;
-	}
-
-	return ev_type;
-}
-
-int
-nds32_pmu_map_event(struct perf_event *event,
-		    const unsigned int (*event_map)[PERF_COUNT_HW_MAX],
-		    const unsigned int (*cache_map)
-		    [PERF_COUNT_HW_CACHE_MAX]
-		    [PERF_COUNT_HW_CACHE_OP_MAX]
-		    [PERF_COUNT_HW_CACHE_RESULT_MAX], u32 raw_event_mask)
-{
-	u64 config = event->attr.config;
-
-	switch (event->attr.type) {
-	case PERF_TYPE_HARDWARE:
-		return nds32_pmu_map_hw_event(event_map, config);
-	case PERF_TYPE_HW_CACHE:
-		return nds32_pmu_map_cache_event(cache_map, config);
-	case PERF_TYPE_RAW:
-		return nds32_pmu_map_raw_event(raw_event_mask, config);
-	}
-
-	return -ENOENT;
-}
-
-static int nds32_spav3_map_event(struct perf_event *event)
-{
-	return nds32_pmu_map_event(event, &nds32_pfm_perf_map,
-				&nds32_pfm_perf_cache_map, SOFTWARE_EVENT_MASK);
-}
-
-static inline u32 nds32_pfm_getreset_flags(void)
-{
-	/* Read overflow status */
-	u32 val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 old_val = val;
-
-	/* Write overflow bit to clear status, and others keep it 0 */
-	u32 ov_flag = PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2];
-
-	__nds32__mtsr(val | ov_flag, NDS32_SR_PFM_CTL);
-
-	return old_val;
-}
-
-static inline int nds32_pfm_has_overflowed(u32 pfm)
-{
-	u32 ov_flag = PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2];
-
-	return pfm & ov_flag;
-}
-
-static inline int nds32_pfm_counter_has_overflowed(u32 pfm, int idx)
-{
-	u32 mask = 0;
-
-	switch (idx) {
-	case 0:
-		mask = PFM_CTL_OVF[0];
-		break;
-	case 1:
-		mask = PFM_CTL_OVF[1];
-		break;
-	case 2:
-		mask = PFM_CTL_OVF[2];
-		break;
-	default:
-		pr_err("%s index wrong\n", __func__);
-		break;
-	}
-	return pfm & mask;
-}
-
-/*
- * Set the next IRQ period, based on the hwc->period_left value.
- * To be called with the event disabled in hw:
- */
-int nds32_pmu_event_set_period(struct perf_event *event)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	s64 left = local64_read(&hwc->period_left);
-	s64 period = hwc->sample_period;
-	int ret = 0;
-
-	/* The period may have been changed by PERF_EVENT_IOC_PERIOD */
-	if (unlikely(period != hwc->last_period))
-		left = period - (hwc->last_period - left);
-
-	if (unlikely(left <= -period)) {
-		left = period;
-		local64_set(&hwc->period_left, left);
-		hwc->last_period = period;
-		ret = 1;
-	}
-
-	if (unlikely(left <= 0)) {
-		left += period;
-		local64_set(&hwc->period_left, left);
-		hwc->last_period = period;
-		ret = 1;
-	}
-
-	if (left > (s64)nds32_pmu->max_period)
-		left = nds32_pmu->max_period;
-
-	/*
-	 * The hw event starts counting from this event offset,
-	 * mark it to be able to extract future "deltas":
-	 */
-	local64_set(&hwc->prev_count, (u64)(-left));
-
-	nds32_pmu->write_counter(event, (u64)(-left) & nds32_pmu->max_period);
-
-	perf_event_update_userpage(event);
-
-	return ret;
-}
-
-static irqreturn_t nds32_pmu_handle_irq(int irq_num, void *dev)
-{
-	u32 pfm;
-	struct perf_sample_data data;
-	struct nds32_pmu *cpu_pmu = (struct nds32_pmu *)dev;
-	struct pmu_hw_events *cpuc = cpu_pmu->get_hw_events();
-	struct pt_regs *regs;
-	int idx;
-	/*
-	 * Get and reset the IRQ flags
-	 */
-	pfm = nds32_pfm_getreset_flags();
-
-	/*
-	 * Did an overflow occur?
-	 */
-	if (!nds32_pfm_has_overflowed(pfm))
-		return IRQ_NONE;
-
-	/*
-	 * Handle the counter(s) overflow(s)
-	 */
-	regs = get_irq_regs();
-
-	nds32_pmu_stop(cpu_pmu);
-	for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
-		struct perf_event *event = cpuc->events[idx];
-		struct hw_perf_event *hwc;
-
-		/* Ignore if we don't have an event. */
-		if (!event)
-			continue;
-
-		/*
-		 * We have a single interrupt for all counters. Check that
-		 * each counter has overflowed before we process it.
-		 */
-		if (!nds32_pfm_counter_has_overflowed(pfm, idx))
-			continue;
-
-		hwc = &event->hw;
-		nds32_pmu_event_update(event);
-		perf_sample_data_init(&data, 0, hwc->last_period);
-		if (!nds32_pmu_event_set_period(event))
-			continue;
-
-		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(event);
-	}
-	nds32_pmu_start(cpu_pmu);
-	/*
-	 * Handle the pending perf events.
-	 *
-	 * Note: this call *must* be run with interrupts disabled. For
-	 * platforms that can have the PMU interrupts raised as an NMI, this
-	 * will not work.
-	 */
-	irq_work_run();
-
-	return IRQ_HANDLED;
-}
-
-static inline int nds32_pfm_counter_valid(struct nds32_pmu *cpu_pmu, int idx)
-{
-	return ((idx >= 0) && (idx < cpu_pmu->num_events));
-}
-
-static inline int nds32_pfm_disable_counter(int idx)
-{
-	unsigned int val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 mask = 0;
-
-	mask = PFM_CTL_EN[idx];
-	val &= ~mask;
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-	return idx;
-}
-
-/*
- * Add an event filter to a given event.
- */
-static int nds32_pmu_set_event_filter(struct hw_perf_event *event,
-				      struct perf_event_attr *attr)
-{
-	unsigned long config_base = 0;
-	int idx = event->idx;
-	unsigned long no_kernel_tracing = 0;
-	unsigned long no_user_tracing = 0;
-	/* If index is -1, do not do anything */
-	if (idx == -1)
-		return 0;
-
-	no_kernel_tracing = PFM_CTL_KS[idx];
-	no_user_tracing = PFM_CTL_KU[idx];
-	/*
-	 * Default: enable both kernel and user mode tracing.
-	 */
-	if (attr->exclude_user)
-		config_base |= no_user_tracing;
-
-	if (attr->exclude_kernel)
-		config_base |= no_kernel_tracing;
-
-	/*
-	 * Install the filter into config_base as this is used to
-	 * construct the event type.
-	 */
-	event->config_base |= config_base;
-	return 0;
-}
-
-static inline void nds32_pfm_write_evtsel(int idx, u32 evnum)
-{
-	u32 offset = 0;
-	u32 ori_val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 ev_mask = 0;
-	u32 no_kernel_mask = 0;
-	u32 no_user_mask = 0;
-	u32 val;
-
-	offset = PFM_CTL_OFFSEL[idx];
-	/* Clear previous mode selection, and write new one */
-	no_kernel_mask = PFM_CTL_KS[idx];
-	no_user_mask = PFM_CTL_KU[idx];
-	ori_val &= ~no_kernel_mask;
-	ori_val &= ~no_user_mask;
-	if (evnum & no_kernel_mask)
-		ori_val |= no_kernel_mask;
-
-	if (evnum & no_user_mask)
-		ori_val |= no_user_mask;
-
-	/* Clear previous event selection */
-	ev_mask = PFM_CTL_SEL[idx];
-	ori_val &= ~ev_mask;
-	evnum &= SOFTWARE_EVENT_MASK;
-
-	/* undo the linear mapping */
-	evnum = get_converted_evet_hw_num(evnum);
-	val = ori_val | (evnum << offset);
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-}
-
-static inline int nds32_pfm_enable_counter(int idx)
-{
-	unsigned int val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 mask = 0;
-
-	mask = PFM_CTL_EN[idx];
-	val |= mask;
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-	return idx;
-}
-
-static inline int nds32_pfm_enable_intens(int idx)
-{
-	unsigned int val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 mask = 0;
-
-	mask = PFM_CTL_IE[idx];
-	val |= mask;
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-	return idx;
-}
-
-static inline int nds32_pfm_disable_intens(int idx)
-{
-	unsigned int val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	u32 mask = 0;
-
-	mask = PFM_CTL_IE[idx];
-	val &= ~mask;
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-	return idx;
-}
-
-static int event_requires_mode_exclusion(struct perf_event_attr *attr)
-{
-	/* Other modes NDS32 does not support */
-	return attr->exclude_user || attr->exclude_kernel;
-}
-
-static void nds32_pmu_enable_event(struct perf_event *event)
-{
-	unsigned long flags;
-	unsigned int evnum = 0;
-	struct hw_perf_event *hwc = &event->hw;
-	struct nds32_pmu *cpu_pmu = to_nds32_pmu(event->pmu);
-	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
-	int idx = hwc->idx;
-
-	if (!nds32_pfm_counter_valid(cpu_pmu, idx)) {
-		pr_err("CPU enabling wrong pfm counter IRQ enable\n");
-		return;
-	}
-
-	/*
-	 * Enable counter and interrupt, and set the counter to count
-	 * the event that we're interested in.
-	 */
-	raw_spin_lock_irqsave(&events->pmu_lock, flags);
-
-	/*
-	 * Disable counter
-	 */
-	nds32_pfm_disable_counter(idx);
-
-	/*
-	 * Check whether we need to exclude the counter from certain modes.
-	 */
-	if ((!cpu_pmu->set_event_filter ||
-	     cpu_pmu->set_event_filter(hwc, &event->attr)) &&
-	     event_requires_mode_exclusion(&event->attr)) {
-		pr_notice
-		("NDS32 performance counters do not support mode exclusion\n");
-		hwc->config_base = 0;
-	}
-	/* Write event */
-	evnum = hwc->config_base;
-	nds32_pfm_write_evtsel(idx, evnum);
-
-	/*
-	 * Enable interrupt for this counter
-	 */
-	nds32_pfm_enable_intens(idx);
-
-	/*
-	 * Enable counter
-	 */
-	nds32_pfm_enable_counter(idx);
-
-	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
-}
-
-static void nds32_pmu_disable_event(struct perf_event *event)
-{
-	unsigned long flags;
-	struct hw_perf_event *hwc = &event->hw;
-	struct nds32_pmu *cpu_pmu = to_nds32_pmu(event->pmu);
-	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
-	int idx = hwc->idx;
-
-	if (!nds32_pfm_counter_valid(cpu_pmu, idx)) {
-		pr_err("CPU disabling wrong pfm counter IRQ enable %d\n", idx);
-		return;
-	}
-
-	/*
-	 * Disable counter and interrupt
-	 */
-	raw_spin_lock_irqsave(&events->pmu_lock, flags);
-
-	/*
-	 * Disable counter
-	 */
-	nds32_pfm_disable_counter(idx);
-
-	/*
-	 * Disable interrupt for this counter
-	 */
-	nds32_pfm_disable_intens(idx);
-
-	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
-}
-
-static inline u32 nds32_pmu_read_counter(struct perf_event *event)
-{
-	struct nds32_pmu *cpu_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	int idx = hwc->idx;
-	u32 count = 0;
-
-	if (!nds32_pfm_counter_valid(cpu_pmu, idx)) {
-		pr_err("CPU reading wrong counter %d\n", idx);
-	} else {
-		switch (idx) {
-		case PFMC0:
-			count = __nds32__mfsr(NDS32_SR_PFMC0);
-			break;
-		case PFMC1:
-			count = __nds32__mfsr(NDS32_SR_PFMC1);
-			break;
-		case PFMC2:
-			count = __nds32__mfsr(NDS32_SR_PFMC2);
-			break;
-		default:
-			pr_err
-			    ("%s: CPU has no performance counters %d\n",
-			     __func__, idx);
-		}
-	}
-	return count;
-}
-
-static inline void nds32_pmu_write_counter(struct perf_event *event, u32 value)
-{
-	struct nds32_pmu *cpu_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	int idx = hwc->idx;
-
-	if (!nds32_pfm_counter_valid(cpu_pmu, idx)) {
-		pr_err("CPU writing wrong counter %d\n", idx);
-	} else {
-		switch (idx) {
-		case PFMC0:
-			__nds32__mtsr_isb(value, NDS32_SR_PFMC0);
-			break;
-		case PFMC1:
-			__nds32__mtsr_isb(value, NDS32_SR_PFMC1);
-			break;
-		case PFMC2:
-			__nds32__mtsr_isb(value, NDS32_SR_PFMC2);
-			break;
-		default:
-			pr_err
-			    ("%s: CPU has no performance counters %d\n",
-			     __func__, idx);
-		}
-	}
-}
-
-static int nds32_pmu_get_event_idx(struct pmu_hw_events *cpuc,
-				   struct perf_event *event)
-{
-	int idx;
-	struct hw_perf_event *hwc = &event->hw;
-	/*
-	 * Current implementation maps cycles, instruction count and cache-miss
-	 * to specific counter.
-	 * However, multiple of the 3 counters are able to count these events.
-	 *
-	 *
-	 * SOFTWARE_EVENT_MASK mask for getting event num ,
-	 * This is defined by Jia-Rung, you can change the polocies.
-	 * However, do not exceed 8 bits. This is hardware specific.
-	 * The last number is SPAv3_2_SEL_LAST.
-	 */
-	unsigned long evtype = hwc->config_base & SOFTWARE_EVENT_MASK;
-
-	idx = get_converted_event_idx(evtype);
-	/*
-	 * Try to get the counter for correpsonding event
-	 */
-	if (evtype == SPAV3_0_SEL_TOTAL_CYCLES) {
-		if (!test_and_set_bit(idx, cpuc->used_mask))
-			return idx;
-		if (!test_and_set_bit(NDS32_IDX_COUNTER0, cpuc->used_mask))
-			return NDS32_IDX_COUNTER0;
-		if (!test_and_set_bit(NDS32_IDX_COUNTER1, cpuc->used_mask))
-			return NDS32_IDX_COUNTER1;
-	} else if (evtype == SPAV3_1_SEL_COMPLETED_INSTRUCTION) {
-		if (!test_and_set_bit(idx, cpuc->used_mask))
-			return idx;
-		else if (!test_and_set_bit(NDS32_IDX_COUNTER1, cpuc->used_mask))
-			return NDS32_IDX_COUNTER1;
-		else if (!test_and_set_bit
-			 (NDS32_IDX_CYCLE_COUNTER, cpuc->used_mask))
-			return NDS32_IDX_CYCLE_COUNTER;
-	} else {
-		if (!test_and_set_bit(idx, cpuc->used_mask))
-			return idx;
-	}
-	return -EAGAIN;
-}
-
-static void nds32_pmu_start(struct nds32_pmu *cpu_pmu)
-{
-	unsigned long flags;
-	unsigned int val;
-	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
-
-	raw_spin_lock_irqsave(&events->pmu_lock, flags);
-
-	/* Enable all counters , NDS PFM has 3 counters */
-	val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	val |= (PFM_CTL_EN[0] | PFM_CTL_EN[1] | PFM_CTL_EN[2]);
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-
-	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
-}
-
-static void nds32_pmu_stop(struct nds32_pmu *cpu_pmu)
-{
-	unsigned long flags;
-	unsigned int val;
-	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
-
-	raw_spin_lock_irqsave(&events->pmu_lock, flags);
-
-	/* Disable all counters , NDS PFM has 3 counters */
-	val = __nds32__mfsr(NDS32_SR_PFM_CTL);
-	val &= ~(PFM_CTL_EN[0] | PFM_CTL_EN[1] | PFM_CTL_EN[2]);
-	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
-
-	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
-}
-
-static void nds32_pmu_reset(void *info)
-{
-	u32 val = 0;
-
-	val |= (PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
-	__nds32__mtsr(val, NDS32_SR_PFM_CTL);
-	__nds32__mtsr(0, NDS32_SR_PFM_CTL);
-	__nds32__mtsr(0, NDS32_SR_PFMC0);
-	__nds32__mtsr(0, NDS32_SR_PFMC1);
-	__nds32__mtsr(0, NDS32_SR_PFMC2);
-}
-
-static void nds32_pmu_init(struct nds32_pmu *cpu_pmu)
-{
-	cpu_pmu->handle_irq = nds32_pmu_handle_irq;
-	cpu_pmu->enable = nds32_pmu_enable_event;
-	cpu_pmu->disable = nds32_pmu_disable_event;
-	cpu_pmu->read_counter = nds32_pmu_read_counter;
-	cpu_pmu->write_counter = nds32_pmu_write_counter;
-	cpu_pmu->get_event_idx = nds32_pmu_get_event_idx;
-	cpu_pmu->start = nds32_pmu_start;
-	cpu_pmu->stop = nds32_pmu_stop;
-	cpu_pmu->reset = nds32_pmu_reset;
-	cpu_pmu->max_period = 0xFFFFFFFF;	/* Maximum counts */
-};
-
-static u32 nds32_read_num_pfm_events(void)
-{
-	/* NDS32 SPAv3 PMU support 3 counter */
-	return 3;
-}
-
-static int device_pmu_init(struct nds32_pmu *cpu_pmu)
-{
-	nds32_pmu_init(cpu_pmu);
-	/*
-	 * This name should be devive-specific name, whatever you like :)
-	 * I think "PMU" will be a good generic name.
-	 */
-	cpu_pmu->name = "nds32v3-pmu";
-	cpu_pmu->map_event = nds32_spav3_map_event;
-	cpu_pmu->num_events = nds32_read_num_pfm_events();
-	cpu_pmu->set_event_filter = nds32_pmu_set_event_filter;
-	return 0;
-}
-
-/*
- * CPU PMU identification and probing.
- */
-static int probe_current_pmu(struct nds32_pmu *pmu)
-{
-	int ret;
-
-	get_cpu();
-	ret = -ENODEV;
-	/*
-	 * If ther are various CPU types with its own PMU, initialize with
-	 *
-	 * the corresponding one
-	 */
-	device_pmu_init(pmu);
-	put_cpu();
-	return ret;
-}
-
-static void nds32_pmu_enable(struct pmu *pmu)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(pmu);
-	struct pmu_hw_events *hw_events = nds32_pmu->get_hw_events();
-	int enabled = bitmap_weight(hw_events->used_mask,
-				    nds32_pmu->num_events);
-
-	if (enabled)
-		nds32_pmu->start(nds32_pmu);
-}
-
-static void nds32_pmu_disable(struct pmu *pmu)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(pmu);
-
-	nds32_pmu->stop(nds32_pmu);
-}
-
-static void nds32_pmu_release_hardware(struct nds32_pmu *nds32_pmu)
-{
-	nds32_pmu->free_irq(nds32_pmu);
-	pm_runtime_put_sync(&nds32_pmu->plat_device->dev);
-}
-
-static irqreturn_t nds32_pmu_dispatch_irq(int irq, void *dev)
-{
-	struct nds32_pmu *nds32_pmu = (struct nds32_pmu *)dev;
-	int ret;
-	u64 start_clock, finish_clock;
-
-	start_clock = local_clock();
-	ret = nds32_pmu->handle_irq(irq, dev);
-	finish_clock = local_clock();
-
-	perf_sample_event_took(finish_clock - start_clock);
-	return ret;
-}
-
-static int nds32_pmu_reserve_hardware(struct nds32_pmu *nds32_pmu)
-{
-	int err;
-	struct platform_device *pmu_device = nds32_pmu->plat_device;
-
-	if (!pmu_device)
-		return -ENODEV;
-
-	pm_runtime_get_sync(&pmu_device->dev);
-	err = nds32_pmu->request_irq(nds32_pmu, nds32_pmu_dispatch_irq);
-	if (err) {
-		nds32_pmu_release_hardware(nds32_pmu);
-		return err;
-	}
-
-	return 0;
-}
-
-static int
-validate_event(struct pmu *pmu, struct pmu_hw_events *hw_events,
-	       struct perf_event *event)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-
-	if (is_software_event(event))
-		return 1;
-
-	if (event->pmu != pmu)
-		return 0;
-
-	if (event->state < PERF_EVENT_STATE_OFF)
-		return 1;
-
-	if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
-		return 1;
-
-	return nds32_pmu->get_event_idx(hw_events, event) >= 0;
-}
-
-static int validate_group(struct perf_event *event)
-{
-	struct perf_event *sibling, *leader = event->group_leader;
-	struct pmu_hw_events fake_pmu;
-	DECLARE_BITMAP(fake_used_mask, MAX_COUNTERS);
-	/*
-	 * Initialize the fake PMU. We only need to populate the
-	 * used_mask for the purposes of validation.
-	 */
-	memset(fake_used_mask, 0, sizeof(fake_used_mask));
-
-	if (!validate_event(event->pmu, &fake_pmu, leader))
-		return -EINVAL;
-
-	for_each_sibling_event(sibling, leader) {
-		if (!validate_event(event->pmu, &fake_pmu, sibling))
-			return -EINVAL;
-	}
-
-	if (!validate_event(event->pmu, &fake_pmu, event))
-		return -EINVAL;
-
-	return 0;
-}
-
-static int __hw_perf_event_init(struct perf_event *event)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	int mapping;
-
-	mapping = nds32_pmu->map_event(event);
-
-	if (mapping < 0) {
-		pr_debug("event %x:%llx not supported\n", event->attr.type,
-			 event->attr.config);
-		return mapping;
-	}
-
-	/*
-	 * 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;
-	hwc->config_base = 0;
-	hwc->config = 0;
-	hwc->event_base = 0;
-
-	/*
-	 * Check whether we need to exclude the counter from certain modes.
-	 */
-	if ((!nds32_pmu->set_event_filter ||
-	     nds32_pmu->set_event_filter(hwc, &event->attr)) &&
-	    event_requires_mode_exclusion(&event->attr)) {
-		pr_debug
-			("NDS performance counters do not support mode exclusion\n");
-		return -EOPNOTSUPP;
-	}
-
-	/*
-	 * Store the event encoding into the config_base field.
-	 */
-	hwc->config_base |= (unsigned long)mapping;
-
-	if (!hwc->sample_period) {
-		/*
-		 * For non-sampling runs, limit the sample_period to half
-		 * of the counter width. That way, the new counter value
-		 * is far less likely to overtake the previous one unless
-		 * you have some serious IRQ latency issues.
-		 */
-		hwc->sample_period = nds32_pmu->max_period >> 1;
-		hwc->last_period = hwc->sample_period;
-		local64_set(&hwc->period_left, hwc->sample_period);
-	}
-
-	if (event->group_leader != event) {
-		if (validate_group(event) != 0)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int nds32_pmu_event_init(struct perf_event *event)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	int err = 0;
-	atomic_t *active_events = &nds32_pmu->active_events;
-
-	/* does not support taken branch sampling */
-	if (has_branch_stack(event))
-		return -EOPNOTSUPP;
-
-	if (nds32_pmu->map_event(event) == -ENOENT)
-		return -ENOENT;
-
-	if (!atomic_inc_not_zero(active_events)) {
-		if (atomic_read(active_events) == 0) {
-			/* Register irq handler */
-			err = nds32_pmu_reserve_hardware(nds32_pmu);
-		}
-
-		if (!err)
-			atomic_inc(active_events);
-	}
-
-	if (err)
-		return err;
-
-	err = __hw_perf_event_init(event);
-
-	return err;
-}
-
-static void nds32_start(struct perf_event *event, int flags)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	/*
-	 * NDS pmu always has to reprogram the period, so ignore
-	 * PERF_EF_RELOAD, see the comment below.
-	 */
-	if (flags & PERF_EF_RELOAD)
-		WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
-
-	hwc->state = 0;
-	/* Set the period for the event. */
-	nds32_pmu_event_set_period(event);
-
-	nds32_pmu->enable(event);
-}
-
-static int nds32_pmu_add(struct perf_event *event, int flags)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct pmu_hw_events *hw_events = nds32_pmu->get_hw_events();
-	struct hw_perf_event *hwc = &event->hw;
-	int idx;
-	int err = 0;
-
-	perf_pmu_disable(event->pmu);
-
-	/* If we don't have a space for the counter then finish early. */
-	idx = nds32_pmu->get_event_idx(hw_events, event);
-	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;
-	nds32_pmu->disable(event);
-	hw_events->events[idx] = event;
-
-	hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
-	if (flags & PERF_EF_START)
-		nds32_start(event, PERF_EF_RELOAD);
-
-	/* Propagate our changes to the userspace mapping. */
-	perf_event_update_userpage(event);
-
-out:
-	perf_pmu_enable(event->pmu);
-	return err;
-}
-
-u64 nds32_pmu_event_update(struct perf_event *event)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	u64 delta, prev_raw_count, new_raw_count;
-
-again:
-	prev_raw_count = local64_read(&hwc->prev_count);
-	new_raw_count = nds32_pmu->read_counter(event);
-
-	if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
-			    new_raw_count) != prev_raw_count) {
-		goto again;
-	}
-	/*
-	 * Whether overflow or not, "unsigned substraction"
-	 * will always get their delta
-	 */
-	delta = (new_raw_count - prev_raw_count) & nds32_pmu->max_period;
-
-	local64_add(delta, &event->count);
-	local64_sub(delta, &hwc->period_left);
-
-	return new_raw_count;
-}
-
-static void nds32_stop(struct perf_event *event, int flags)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct hw_perf_event *hwc = &event->hw;
-	/*
-	 * NDS pmu always has to update the counter, so ignore
-	 * PERF_EF_UPDATE, see comments in nds32_start().
-	 */
-	if (!(hwc->state & PERF_HES_STOPPED)) {
-		nds32_pmu->disable(event);
-		nds32_pmu_event_update(event);
-		hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
-	}
-}
-
-static void nds32_pmu_del(struct perf_event *event, int flags)
-{
-	struct nds32_pmu *nds32_pmu = to_nds32_pmu(event->pmu);
-	struct pmu_hw_events *hw_events = nds32_pmu->get_hw_events();
-	struct hw_perf_event *hwc = &event->hw;
-	int idx = hwc->idx;
-
-	nds32_stop(event, PERF_EF_UPDATE);
-	hw_events->events[idx] = NULL;
-	clear_bit(idx, hw_events->used_mask);
-
-	perf_event_update_userpage(event);
-}
-
-static void nds32_pmu_read(struct perf_event *event)
-{
-	nds32_pmu_event_update(event);
-}
-
-/* Please refer to SPAv3 for more hardware specific details */
-PMU_FORMAT_ATTR(event, "config:0-63");
-
-static struct attribute *nds32_arch_formats_attr[] = {
-	&format_attr_event.attr,
-	NULL,
-};
-
-static struct attribute_group nds32_pmu_format_group = {
-	.name = "format",
-	.attrs = nds32_arch_formats_attr,
-};
-
-static ssize_t nds32_pmu_cpumask_show(struct device *dev,
-				      struct device_attribute *attr,
-				      char *buf)
-{
-	return 0;
-}
-
-static DEVICE_ATTR(cpus, 0444, nds32_pmu_cpumask_show, NULL);
-
-static struct attribute *nds32_pmu_common_attrs[] = {
-	&dev_attr_cpus.attr,
-	NULL,
-};
-
-static struct attribute_group nds32_pmu_common_group = {
-	.attrs = nds32_pmu_common_attrs,
-};
-
-static const struct attribute_group *nds32_pmu_attr_groups[] = {
-	&nds32_pmu_format_group,
-	&nds32_pmu_common_group,
-	NULL,
-};
-
-static void nds32_init(struct nds32_pmu *nds32_pmu)
-{
-	atomic_set(&nds32_pmu->active_events, 0);
-
-	nds32_pmu->pmu = (struct pmu) {
-		.pmu_enable = nds32_pmu_enable,
-		.pmu_disable = nds32_pmu_disable,
-		.attr_groups = nds32_pmu_attr_groups,
-		.event_init = nds32_pmu_event_init,
-		.add = nds32_pmu_add,
-		.del = nds32_pmu_del,
-		.start = nds32_start,
-		.stop = nds32_stop,
-		.read = nds32_pmu_read,
-	};
-}
-
-int nds32_pmu_register(struct nds32_pmu *nds32_pmu, int type)
-{
-	nds32_init(nds32_pmu);
-	pm_runtime_enable(&nds32_pmu->plat_device->dev);
-	pr_info("enabled with %s PMU driver, %d counters available\n",
-		nds32_pmu->name, nds32_pmu->num_events);
-	return perf_pmu_register(&nds32_pmu->pmu, nds32_pmu->name, type);
-}
-
-static struct pmu_hw_events *cpu_pmu_get_cpu_events(void)
-{
-	return this_cpu_ptr(&cpu_hw_events);
-}
-
-static int cpu_pmu_request_irq(struct nds32_pmu *cpu_pmu, irq_handler_t handler)
-{
-	int err, irq, irqs;
-	struct platform_device *pmu_device = cpu_pmu->plat_device;
-
-	if (!pmu_device)
-		return -ENODEV;
-
-	irqs = min(pmu_device->num_resources, num_possible_cpus());
-	if (irqs < 1) {
-		pr_err("no irqs for PMUs defined\n");
-		return -ENODEV;
-	}
-
-	irq = platform_get_irq(pmu_device, 0);
-	err = request_irq(irq, handler, IRQF_NOBALANCING, "nds32-pfm",
-			  cpu_pmu);
-	if (err) {
-		pr_err("unable to request IRQ%d for NDS PMU counters\n",
-		       irq);
-		return err;
-	}
-	return 0;
-}
-
-static void cpu_pmu_free_irq(struct nds32_pmu *cpu_pmu)
-{
-	int irq;
-	struct platform_device *pmu_device = cpu_pmu->plat_device;
-
-	irq = platform_get_irq(pmu_device, 0);
-	if (irq >= 0)
-		free_irq(irq, cpu_pmu);
-}
-
-static void cpu_pmu_init(struct nds32_pmu *cpu_pmu)
-{
-	int cpu;
-	struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
-
-	raw_spin_lock_init(&events->pmu_lock);
-
-	cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events;
-	cpu_pmu->request_irq = cpu_pmu_request_irq;
-	cpu_pmu->free_irq = cpu_pmu_free_irq;
-
-	/* Ensure the PMU has sane values out of reset. */
-	if (cpu_pmu->reset)
-		on_each_cpu(cpu_pmu->reset, cpu_pmu, 1);
-}
-
-static const struct of_device_id cpu_pmu_of_device_ids[] = {
-	{.compatible = "andestech,nds32v3-pmu",
-	 .data = device_pmu_init},
-	{},
-};
-
-static int cpu_pmu_device_probe(struct platform_device *pdev)
-{
-	const struct of_device_id *of_id;
-	int (*init_fn)(struct nds32_pmu *nds32_pmu);
-	struct device_node *node = pdev->dev.of_node;
-	struct nds32_pmu *pmu;
-	int ret = -ENODEV;
-
-	if (cpu_pmu) {
-		pr_notice("[perf] attempt to register multiple PMU devices!\n");
-		return -ENOSPC;
-	}
-
-	pmu = kzalloc(sizeof(*pmu), GFP_KERNEL);
-	if (!pmu)
-		return -ENOMEM;
-
-	of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node);
-	if (node && of_id) {
-		init_fn = of_id->data;
-		ret = init_fn(pmu);
-	} else {
-		ret = probe_current_pmu(pmu);
-	}
-
-	if (ret) {
-		pr_notice("[perf] failed to probe PMU!\n");
-		goto out_free;
-	}
-
-	cpu_pmu = pmu;
-	cpu_pmu->plat_device = pdev;
-	cpu_pmu_init(cpu_pmu);
-	ret = nds32_pmu_register(cpu_pmu, PERF_TYPE_RAW);
-
-	if (!ret)
-		return 0;
-
-out_free:
-	pr_notice("[perf] failed to register PMU devices!\n");
-	kfree(pmu);
-	return ret;
-}
-
-static struct platform_driver cpu_pmu_driver = {
-	.driver = {
-		   .name = "nds32-pfm",
-		   .of_match_table = cpu_pmu_of_device_ids,
-		   },
-	.probe = cpu_pmu_device_probe,
-	.id_table = cpu_pmu_plat_device_ids,
-};
-
-static int __init register_pmu_driver(void)
-{
-	int err = 0;
-
-	err = platform_driver_register(&cpu_pmu_driver);
-	if (err)
-		pr_notice("[perf] PMU initialization failed\n");
-	else
-		pr_notice("[perf] PMU initialization done\n");
-
-	return err;
-}
-
-device_initcall(register_pmu_driver);
-
-/*
- * References: arch/nds32/kernel/traps.c:__dump()
- * You will need to know the NDS ABI first.
- */
-static int unwind_frame_kernel(struct stackframe *frame)
-{
-	int graph = 0;
-#ifdef CONFIG_FRAME_POINTER
-	/* 0x3 means misalignment */
-	if (!kstack_end((void *)frame->fp) &&
-	    !((unsigned long)frame->fp & 0x3) &&
-	    ((unsigned long)frame->fp >= TASK_SIZE)) {
-		/*
-		 *	The array index is based on the ABI, the below graph
-		 *	illustrate the reasons.
-		 *	Function call procedure: "smw" and "lmw" will always
-		 *	update SP and FP for you automatically.
-		 *
-		 *	Stack                                 Relative Address
-		 *	|  |                                          0
-		 *	----
-		 *	|LP| <-- SP(before smw)  <-- FP(after smw)   -1
-		 *	----
-		 *	|FP|                                         -2
-		 *	----
-		 *	|  | <-- SP(after smw)                       -3
-		 */
-		frame->lp = ((unsigned long *)frame->fp)[-1];
-		frame->fp = ((unsigned long *)frame->fp)[FP_OFFSET];
-		/* make sure CONFIG_FUNCTION_GRAPH_TRACER is turned on */
-		if (__kernel_text_address(frame->lp))
-			frame->lp = ftrace_graph_ret_addr
-						(NULL, &graph, frame->lp, NULL);
-
-		return 0;
-	} else {
-		return -EPERM;
-	}
-#else
-	/*
-	 * You can refer to arch/nds32/kernel/traps.c:__dump()
-	 * Treat "sp" as "fp", but the "sp" is one frame ahead of "fp".
-	 * And, the "sp" is not always correct.
-	 *
-	 *   Stack                                 Relative Address
-	 *   |  |                                          0
-	 *   ----
-	 *   |LP| <-- SP(before smw)                      -1
-	 *   ----
-	 *   |  | <-- SP(after smw)                       -2
-	 *   ----
-	 */
-	if (!kstack_end((void *)frame->sp)) {
-		frame->lp = ((unsigned long *)frame->sp)[1];
-		/* TODO: How to deal with the value in first
-		 * "sp" is not correct?
-		 */
-		if (__kernel_text_address(frame->lp))
-			frame->lp = ftrace_graph_ret_addr
-						(tsk, &graph, frame->lp, NULL);
-
-		frame->sp = ((unsigned long *)frame->sp) + 1;
-
-		return 0;
-	} else {
-		return -EPERM;
-	}
-#endif
-}
-
-static void notrace
-walk_stackframe(struct stackframe *frame,
-		int (*fn_record)(struct stackframe *, void *),
-		void *data)
-{
-	while (1) {
-		int ret;
-
-		if (fn_record(frame, data))
-			break;
-
-		ret = unwind_frame_kernel(frame);
-		if (ret < 0)
-			break;
-	}
-}
-
-/*
- * 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_ctx *entry = data;
-
-	perf_callchain_store(entry, fr->lp);
-	return 0;
-}
-
-/*
- * Get the return address for a single stackframe and return a pointer to the
- * next frame tail.
- */
-static unsigned long
-user_backtrace(struct perf_callchain_entry_ctx *entry, unsigned long fp)
-{
-	struct frame_tail buftail;
-	unsigned long lp = 0;
-	unsigned long *user_frame_tail =
-		(unsigned long *)(fp - (unsigned long)sizeof(buftail));
-
-	/* Check accessibility of one struct frame_tail beyond */
-	if (!access_ok(user_frame_tail, sizeof(buftail)))
-		return 0;
-	if (__copy_from_user_inatomic
-		(&buftail, user_frame_tail, sizeof(buftail)))
-		return 0;
-
-	/*
-	 * Refer to unwind_frame_kernel() for more illurstration
-	 */
-	lp = buftail.stack_lp;  /* ((unsigned long *)fp)[-1] */
-	fp = buftail.stack_fp;  /* ((unsigned long *)fp)[FP_OFFSET] */
-	perf_callchain_store(entry, lp);
-	return fp;
-}
-
-static unsigned long
-user_backtrace_opt_size(struct perf_callchain_entry_ctx *entry,
-			unsigned long fp)
-{
-	struct frame_tail_opt_size buftail;
-	unsigned long lp = 0;
-
-	unsigned long *user_frame_tail =
-		(unsigned long *)(fp - (unsigned long)sizeof(buftail));
-
-	/* Check accessibility of one struct frame_tail beyond */
-	if (!access_ok(user_frame_tail, sizeof(buftail)))
-		return 0;
-	if (__copy_from_user_inatomic
-		(&buftail, user_frame_tail, sizeof(buftail)))
-		return 0;
-
-	/*
-	 * Refer to unwind_frame_kernel() for more illurstration
-	 */
-	lp = buftail.stack_lp;  /* ((unsigned long *)fp)[-1] */
-	fp = buftail.stack_fp;  /* ((unsigned long *)fp)[FP_OFFSET] */
-
-	perf_callchain_store(entry, lp);
-	return fp;
-}
-
-/*
- * This will be called when the target is in user mode
- * This function will only be called when we use
- * "PERF_SAMPLE_CALLCHAIN" in
- * kernel/events/core.c:perf_prepare_sample()
- *
- * How to trigger perf_callchain_[user/kernel] :
- * $ perf record -e cpu-clock --call-graph fp ./program
- * $ perf report --call-graph
- */
-unsigned long leaf_fp;
-void
-perf_callchain_user(struct perf_callchain_entry_ctx *entry,
-		    struct pt_regs *regs)
-{
-	unsigned long fp = 0;
-	unsigned long gp = 0;
-	unsigned long lp = 0;
-	unsigned long sp = 0;
-	unsigned long *user_frame_tail;
-
-	leaf_fp = 0;
-
-	perf_callchain_store(entry, regs->ipc);
-	fp = regs->fp;
-	gp = regs->gp;
-	lp = regs->lp;
-	sp = regs->sp;
-	if (entry->nr < PERF_MAX_STACK_DEPTH &&
-	    (unsigned long)fp && !((unsigned long)fp & 0x7) && fp > sp) {
-		user_frame_tail =
-			(unsigned long *)(fp - (unsigned long)sizeof(fp));
-
-		if (!access_ok(user_frame_tail, sizeof(fp)))
-			return;
-
-		if (__copy_from_user_inatomic
-			(&leaf_fp, user_frame_tail, sizeof(fp)))
-			return;
-
-		if (leaf_fp == lp) {
-			/*
-			 * Maybe this is non leaf function
-			 * with optimize for size,
-			 * or maybe this is the function
-			 * with optimize for size
-			 */
-			struct frame_tail buftail;
-
-			user_frame_tail =
-				(unsigned long *)(fp -
-					(unsigned long)sizeof(buftail));
-
-			if (!access_ok(user_frame_tail, sizeof(buftail)))
-				return;
-
-			if (__copy_from_user_inatomic
-				(&buftail, user_frame_tail, sizeof(buftail)))
-				return;
-
-			if (buftail.stack_fp == gp) {
-				/* non leaf function with optimize
-				 * for size condition
-				 */
-				struct frame_tail_opt_size buftail_opt_size;
-
-				user_frame_tail =
-					(unsigned long *)(fp - (unsigned long)
-						sizeof(buftail_opt_size));
-
-				if (!access_ok(user_frame_tail,
-					       sizeof(buftail_opt_size)))
-					return;
-
-				if (__copy_from_user_inatomic
-				   (&buftail_opt_size, user_frame_tail,
-				   sizeof(buftail_opt_size)))
-					return;
-
-				perf_callchain_store(entry, lp);
-				fp = buftail_opt_size.stack_fp;
-
-				while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
-				       (unsigned long)fp &&
-						!((unsigned long)fp & 0x7) &&
-						fp > sp) {
-					sp = fp;
-					fp = user_backtrace_opt_size(entry, fp);
-				}
-
-			} else {
-				/* this is the function
-				 * without optimize for size
-				 */
-				fp = buftail.stack_fp;
-				perf_callchain_store(entry, lp);
-				while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
-				       (unsigned long)fp &&
-						!((unsigned long)fp & 0x7) &&
-						fp > sp) {
-					sp = fp;
-					fp = user_backtrace(entry, fp);
-				}
-			}
-		} else {
-			/* this is leaf function */
-			fp = leaf_fp;
-			perf_callchain_store(entry, lp);
-
-			/* previous function callcahin  */
-			while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
-			       (unsigned long)fp &&
-				   !((unsigned long)fp & 0x7) && fp > sp) {
-				sp = fp;
-				fp = user_backtrace(entry, fp);
-			}
-		}
-		return;
-	}
-}
-
-/* This will be called when the target is in kernel mode */
-void
-perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
-		      struct pt_regs *regs)
-{
-	struct stackframe fr;
-
-	fr.fp = regs->fp;
-	fr.lp = regs->lp;
-	fr.sp = regs->sp;
-	walk_stackframe(&fr, callchain_trace, entry);
-}
-
-unsigned long perf_instruction_pointer(struct pt_regs *regs)
-{
-	return instruction_pointer(regs);
-}
-
-unsigned long perf_misc_flags(struct pt_regs *regs)
-{
-	int misc = 0;
-
-	if (user_mode(regs))
-		misc |= PERF_RECORD_MISC_USER;
-	else
-		misc |= PERF_RECORD_MISC_KERNEL;
-
-	return misc;
-}