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android_kernel_samsung_msm8976/drivers/cpuidle/lpm-levels.c

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/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
* Copyright (C) 2006-2007 Adam Belay <abelay@novell.com>
* Copyright (C) 2009 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/irqchip/msm-mpm-irq.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <linux/tick.h>
#include <linux/suspend.h>
#include <linux/pm_qos.h>
#include <linux/of_platform.h>
#include <linux/smp.h>
#include <linux/remote_spinlock.h>
#include <linux/msm_remote_spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/coresight-cti.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/cpu_pm.h>
#include <linux/irqchip/arm-gic.h>
#include <soc/qcom/spm.h>
#include <soc/qcom/pm.h>
#include <soc/qcom/rpm-notifier.h>
#include <soc/qcom/event_timer.h>
#include <soc/qcom/lpm-stats.h>
#include <asm/cputype.h>
#include <asm/arch_timer.h>
#include <asm/cacheflush.h>
#include <asm/suspend.h>
#include "lpm-levels.h"
#include "lpm-workarounds.h"
#include <trace/events/power.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/sec-pinmux.h>
#include <linux/qpnp/pin.h>
#define CREATE_TRACE_POINTS
#include <trace/events/trace_msm_low_power.h>
#include "../../drivers/clk/qcom/clock.h"
#ifdef CONFIG_SEC_GPIO_DVS
#include <linux/secgpio_dvs.h>
#endif
#ifdef CONFIG_SEC_DEBUG
#include <linux/qcom/sec_debug.h>
#endif
#define SCLK_HZ (32768)
#define SCM_HANDOFF_LOCK_ID "S:7"
#define PSCI_POWER_STATE(reset) (reset << 30)
#define PSCI_AFFINITY_LEVEL(lvl) ((lvl & 0x3) << 24)
static remote_spinlock_t scm_handoff_lock;
enum {
MSM_LPM_LVL_DBG_SUSPEND_LIMITS = BIT(0),
MSM_LPM_LVL_DBG_IDLE_LIMITS = BIT(1),
};
enum debug_event {
CPU_ENTER,
CPU_EXIT,
CLUSTER_ENTER,
CLUSTER_EXIT,
PRE_PC_CB,
};
struct lpm_debug {
cycle_t time;
enum debug_event evt;
int cpu;
uint32_t arg1;
uint32_t arg2;
uint32_t arg3;
uint32_t arg4;
};
struct lpm_cluster *lpm_root_node;
static bool lpm_prediction;
module_param_named(lpm_prediction,
lpm_prediction, bool, S_IRUGO | S_IWUSR | S_IWGRP);
static uint32_t ref_stddev = 100;
module_param_named(
ref_stddev, ref_stddev, uint, S_IRUGO | S_IWUSR | S_IWGRP
);
static uint32_t tmr_add = 100;
module_param_named(
tmr_add, tmr_add, uint, S_IRUGO | S_IWUSR | S_IWGRP
);
struct lpm_history {
uint32_t resi[MAXSAMPLES];
int mode[MAXSAMPLES];
int nsamp;
uint32_t hptr;
bool hinvalid;
bool htmr_wkup;
int64_t stime;
};
static DEFINE_PER_CPU(struct lpm_history, hist);
static DEFINE_PER_CPU(struct lpm_cluster*, cpu_cluster);
static bool suspend_in_progress;
static struct hrtimer lpm_hrtimer;
static struct hrtimer histtimer;
static struct lpm_debug *lpm_debug;
static phys_addr_t lpm_debug_phys;
static const int num_dbg_elements = 0x100;
uint32_t cl0_sleep_us;
uint32_t cl1_sleep_us;
static int lpm_cpu_callback(struct notifier_block *cpu_nb,
unsigned long action, void *hcpu);
static void cluster_unprepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle);
static void cluster_prepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle);
static struct notifier_block __refdata lpm_cpu_nblk = {
.notifier_call = lpm_cpu_callback,
};
static bool menu_select;
module_param_named(
menu_select, menu_select, bool, S_IRUGO | S_IWUSR | S_IWGRP
);
static int msm_pm_sleep_time_override;
module_param_named(sleep_time_override,
msm_pm_sleep_time_override, int, S_IRUGO | S_IWUSR | S_IWGRP);
static uint64_t suspend_wake_time;
#ifdef CONFIG_SEC_PM_DEBUG
static int msm_pm_sleep_sec_debug;
module_param_named(secdebug,
msm_pm_sleep_sec_debug, int, S_IRUGO | S_IWUSR | S_IWGRP);
#endif
static bool print_parsed_dt;
module_param_named(
print_parsed_dt, print_parsed_dt, bool, S_IRUGO | S_IWUSR | S_IWGRP
);
static bool sleep_disabled;
module_param_named(sleep_disabled,
sleep_disabled, bool, S_IRUGO | S_IWUSR | S_IWGRP);
#ifdef CONFIG_SEC_PM
extern int wakeup_gpio_irq_flag;
#endif
s32 msm_cpuidle_get_deep_idle_latency(void)
{
return 10;
}
void lpm_suspend_wake_time(uint64_t wakeup_time)
{
if (wakeup_time <= 0) {
suspend_wake_time = msm_pm_sleep_time_override;
return;
}
if (msm_pm_sleep_time_override &&
(msm_pm_sleep_time_override < wakeup_time))
suspend_wake_time = msm_pm_sleep_time_override;
else
suspend_wake_time = wakeup_time;
}
EXPORT_SYMBOL(lpm_suspend_wake_time);
static void update_debug_pc_event(enum debug_event event, uint32_t arg1,
uint32_t arg2, uint32_t arg3, uint32_t arg4)
{
struct lpm_debug *dbg;
int idx;
static DEFINE_SPINLOCK(debug_lock);
static int pc_event_index;
if (!lpm_debug)
return;
spin_lock(&debug_lock);
idx = pc_event_index++;
dbg = &lpm_debug[idx & (num_dbg_elements - 1)];
dbg->evt = event;
dbg->time = arch_counter_get_cntpct();
dbg->cpu = raw_smp_processor_id();
dbg->arg1 = arg1;
dbg->arg2 = arg2;
dbg->arg3 = arg3;
dbg->arg4 = arg4;
spin_unlock(&debug_lock);
}
static void setup_broadcast_timer(void *arg)
{
unsigned long reason = (unsigned long)arg;
int cpu = raw_smp_processor_id();
reason = reason ?
CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
clockevents_notify(reason, &cpu);
}
static int lpm_cpu_callback(struct notifier_block *cpu_nb,
unsigned long action, void *hcpu)
{
unsigned long cpu = (unsigned long) hcpu;
struct lpm_cluster *cluster = per_cpu(cpu_cluster, (unsigned int) cpu);
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DYING:
cluster_prepare(cluster, get_cpu_mask((unsigned int) cpu),
NR_LPM_LEVELS, false);
break;
case CPU_STARTING:
cluster_unprepare(cluster, get_cpu_mask((unsigned int) cpu),
NR_LPM_LEVELS, false);
break;
case CPU_ONLINE:
smp_call_function_single(cpu, setup_broadcast_timer,
(void *)true, 1);
break;
default:
break;
}
return NOTIFY_OK;
}
static enum hrtimer_restart lpm_hrtimer_cb(struct hrtimer *h)
{
return HRTIMER_NORESTART;
}
static void histtimer_cancel(void)
{
hrtimer_try_to_cancel(&histtimer);
}
static enum hrtimer_restart histtimer_fn(struct hrtimer *h)
{
int cpu = raw_smp_processor_id();
struct lpm_history *history = &per_cpu(hist, cpu);
history->hinvalid = 1;
return HRTIMER_NORESTART;
}
static void histtimer_start(uint32_t time_us)
{
uint64_t time_ns = time_us * NSEC_PER_USEC;
ktime_t hist_ktime = ns_to_ktime(time_ns);
histtimer.function = histtimer_fn;
hrtimer_start(&histtimer, hist_ktime, HRTIMER_MODE_REL_PINNED);
}
static void cluster_timer_init(struct lpm_cluster *cluster)
{
struct list_head *list;
if (!cluster)
return;
hrtimer_init(&cluster->histtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
list_for_each(list, &cluster->child) {
struct lpm_cluster *n;
n = list_entry(list, typeof(*n), list);
cluster_timer_init(n);
}
}
static void clusttimer_cancel(void)
{
int cpu = raw_smp_processor_id();
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
hrtimer_try_to_cancel(&cluster->histtimer);
hrtimer_try_to_cancel(&cluster->parent->histtimer);
}
static enum hrtimer_restart clusttimer_fn(struct hrtimer *h)
{
struct lpm_cluster *cluster = container_of(h,
struct lpm_cluster, histtimer);
cluster->history.hinvalid = 1;
return HRTIMER_NORESTART;
}
static void clusttimer_start(struct lpm_cluster *cluster, uint32_t time_us)
{
uint64_t time_ns = time_us * NSEC_PER_USEC;
ktime_t clust_ktime = ns_to_ktime(time_ns);
cluster->histtimer.function = clusttimer_fn;
hrtimer_start(&cluster->histtimer, clust_ktime,
HRTIMER_MODE_REL_PINNED);
}
static void msm_pm_set_timer(uint32_t modified_time_us)
{
u64 modified_time_ns = modified_time_us * NSEC_PER_USEC;
ktime_t modified_ktime = ns_to_ktime(modified_time_ns);
lpm_hrtimer.function = lpm_hrtimer_cb;
hrtimer_start(&lpm_hrtimer, modified_ktime, HRTIMER_MODE_REL_PINNED);
}
int set_l2_mode(struct low_power_ops *ops, int mode, bool notify_rpm)
{
int lpm = mode;
int rc = 0;
struct low_power_ops *cpu_ops = per_cpu(cpu_cluster,
smp_processor_id())->lpm_dev;
if (cpu_ops->tz_flag & MSM_SCM_L2_OFF ||
cpu_ops->tz_flag & MSM_SCM_L2_GDHS)
coresight_cti_ctx_restore();
switch (mode) {
case MSM_SPM_MODE_POWER_COLLAPSE:
cpu_ops->tz_flag = MSM_SCM_L2_OFF;
coresight_cti_ctx_save();
break;
case MSM_SPM_MODE_GDHS:
cpu_ops->tz_flag = MSM_SCM_L2_GDHS;
coresight_cti_ctx_save();
break;
case MSM_SPM_MODE_CLOCK_GATING:
case MSM_SPM_MODE_RETENTION:
case MSM_SPM_MODE_DISABLED:
cpu_ops->tz_flag = MSM_SCM_L2_ON;
break;
default:
cpu_ops->tz_flag = MSM_SCM_L2_ON;
lpm = MSM_SPM_MODE_DISABLED;
break;
}
/* Do not program L2 SPM enable bit. This will be set by TZ */
if (lpm_wa_get_skip_l2_spm())
rc = msm_spm_config_low_power_mode_addr(ops->spm, lpm,
notify_rpm);
else
rc = msm_spm_config_low_power_mode(ops->spm, lpm, notify_rpm);
if (rc)
pr_err("%s: Failed to set L2 low power mode %d, ERR %d",
__func__, lpm, rc);
return rc;
}
int set_l3_mode(struct low_power_ops *ops, int mode, bool notify_rpm)
{
struct low_power_ops *cpu_ops = per_cpu(cpu_cluster,
smp_processor_id())->lpm_dev;
switch (mode) {
case MSM_SPM_MODE_POWER_COLLAPSE:
cpu_ops->tz_flag |= MSM_SCM_L3_PC_OFF;
break;
default:
break;
}
return msm_spm_config_low_power_mode(ops->spm, mode, notify_rpm);
}
int set_system_mode(struct low_power_ops *ops, int mode, bool notify_rpm)
{
if (mode == MSM_SPM_MODE_CLOCK_GATING)
mode = MSM_SPM_MODE_DISABLED;
return msm_spm_config_low_power_mode(ops->spm, mode, notify_rpm);
}
static int set_device_mode(struct lpm_cluster *cluster, int ndevice,
struct lpm_cluster_level *level)
{
struct low_power_ops *ops;
if (use_psci)
return 0;
ops = &cluster->lpm_dev[ndevice];
if (ops && ops->set_mode)
return ops->set_mode(ops, level->mode[ndevice],
level->notify_rpm);
else
return -EINVAL;
}
static uint64_t lpm_cpuidle_predict(struct cpuidle_device *dev,
struct lpm_cpu *cpu, int *idx_restrict,
uint32_t *idx_restrict_time)
{
int i, j, divisor;
uint64_t max, avg, stddev;
int64_t thresh = LLONG_MAX;
struct lpm_history *history = &per_cpu(hist, dev->cpu);
uint32_t *min_residency = get_per_cpu_min_residency(dev->cpu);
if (!lpm_prediction)
return 0;
if (history->hinvalid) {
history->hinvalid = 0;
history->htmr_wkup = 1;
history->stime = 0;
return 0;
}
if (history->nsamp < MAXSAMPLES) {
history->stime = 0;
return 0;
}
again:
max = avg = divisor = stddev = 0;
for (i = 0; i < MAXSAMPLES; i++) {
int64_t value = history->resi[i];
if (value <= thresh) {
avg += value;
divisor++;
if (value > max)
max = value;
}
}
do_div(avg, divisor);
for (i = 0; i < MAXSAMPLES; i++) {
int64_t value = history->resi[i];
if (value <= thresh) {
int64_t diff = value - avg;
stddev += diff * diff;
}
}
do_div(stddev, divisor);
stddev = int_sqrt(stddev);
if (((avg > stddev * 6) && (divisor >= (MAXSAMPLES - 1)))
|| stddev <= ref_stddev) {
history->stime = ktime_to_us(ktime_get()) + avg;
return avg;
} else if (divisor > (MAXSAMPLES - 1)) {
thresh = max - 1;
goto again;
}
if (history->htmr_wkup != 1) {
for (j = 1; j < cpu->nlevels; j++) {
uint32_t failed = 0;
uint64_t total = 0;
for (i = 0; i < MAXSAMPLES; i++) {
if ((history->mode[i] == j) &&
(history->resi[i] < min_residency[j])) {
failed++;
total += history->resi[i];
}
}
if (failed > (MAXSAMPLES-3)) {
*idx_restrict = j;
do_div(total, failed);
*idx_restrict_time = total;
history->stime = ktime_to_us(ktime_get())
+ *idx_restrict_time;
break;
}
}
}
return 0;
}
static inline void invalidate_predict_history(struct cpuidle_device *dev)
{
struct lpm_history *history = &per_cpu(hist, dev->cpu);
if (!lpm_prediction)
return;
if (history->hinvalid) {
history->hinvalid = 0;
history->htmr_wkup = 1;
history->stime = 0;
}
}
static void clear_predict_history(void)
{
struct lpm_history *history;
int i;
unsigned int cpu;
if (!lpm_prediction)
return;
for_each_possible_cpu(cpu) {
history = &per_cpu(hist, cpu);
for (i = 0; i < MAXSAMPLES; i++) {
history->resi[i] = 0;
history->mode[i] = -1;
history->hptr = 0;
history->nsamp = 0;
history->stime = 0;
}
}
}
static void update_history(struct cpuidle_device *dev, int idx);
static int cpu_power_select(struct cpuidle_device *dev,
struct lpm_cpu *cpu, int *index)
{
int best_level = -1;
uint32_t latency_us = pm_qos_request_for_cpu(PM_QOS_CPU_DMA_LATENCY,
dev->cpu);
uint32_t sleep_us =
(uint32_t)(ktime_to_us(tick_nohz_get_sleep_length()));
uint32_t modified_time_us = 0;
uint32_t next_event_us = 0;
int i, idx_restrict;
uint32_t lvl_latency_us = 0;
uint64_t predicted = 0;
uint32_t htime = 0, idx_restrict_time = 0;
uint32_t next_wakeup_us = sleep_us;
uint32_t *min_residency = get_per_cpu_min_residency(dev->cpu);
uint32_t *max_residency = get_per_cpu_max_residency(dev->cpu);
if (!cpu)
return -EINVAL;
#ifdef CONFIG_SAMSUNG_LPM_MODE
if (sleep_disabled || poweroff_charging)
return 0;
#else
if (sleep_disabled)
return 0;
#endif
idx_restrict = cpu->nlevels + 1;
next_event_us = (uint32_t)(ktime_to_us(get_next_event_time(dev->cpu)));
for (i = 0; i < cpu->nlevels; i++) {
struct lpm_cpu_level *level = &cpu->levels[i];
struct power_params *pwr_params = &level->pwr;
enum msm_pm_sleep_mode mode = level->mode;
bool allow;
allow = lpm_cpu_mode_allow(dev->cpu, i, true);
if (!allow)
continue;
if (i > 0 && suspend_in_progress)
continue;
lvl_latency_us = pwr_params->latency_us;
if (latency_us < lvl_latency_us)
break;
if (next_event_us) {
if (next_event_us < lvl_latency_us)
break;
if (((next_event_us - lvl_latency_us) < sleep_us) ||
(next_event_us < sleep_us))
next_wakeup_us = next_event_us - lvl_latency_us;
}
if (!i) {
if (next_wakeup_us > max_residency[i]) {
predicted = lpm_cpuidle_predict(dev, cpu,
&idx_restrict, &idx_restrict_time);
if (predicted < min_residency[i])
predicted = 0;
} else
invalidate_predict_history(dev);
}
if (i >= idx_restrict)
break;
/*
* min_residency is max_residency of previous level+1
* if none of the previous levels are enabled,
* min_residency is time overhead for current level
*/
if (predicted ? (predicted >= min_residency[i])
: (next_wakeup_us >= min_residency[i])) {
best_level = i;
if (next_event_us && next_event_us < sleep_us &&
(mode != MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT))
modified_time_us
= next_event_us - lvl_latency_us;
else
modified_time_us = 0;
}
}
if (modified_time_us)
msm_pm_set_timer(modified_time_us);
if ((predicted || (idx_restrict != (cpu->nlevels + 1)))
&& ((best_level >= 0)
&& (best_level < (cpu->nlevels-1)))) {
htime = predicted + tmr_add;
if (htime == tmr_add)
htime = idx_restrict_time;
else if (htime > max_residency[best_level])
htime = max_residency[best_level];
if ((next_wakeup_us > htime) &&
((next_wakeup_us - htime) > max_residency[best_level]))
histtimer_start(htime);
}
trace_cpu_power_select(best_level, sleep_us, latency_us, next_event_us);
trace_cpu_pred_select(idx_restrict_time ? 2 : (predicted ? 1 : 0),
predicted, htime);
return best_level;
}
static uint64_t get_cluster_sleep_time(struct lpm_cluster *cluster,
struct cpumask *mask, bool from_idle, uint32_t *pred_time)
{
int cpu;
int next_cpu = raw_smp_processor_id();
ktime_t next_event;
struct tick_device *td;
struct cpumask online_cpus_in_cluster;
struct lpm_history *history;
int64_t prediction = LONG_MAX;
next_event.tv64 = KTIME_MAX;
if (!suspend_wake_time)
suspend_wake_time = msm_pm_sleep_time_override;
if (!from_idle) {
if (mask)
cpumask_copy(mask, cpumask_of(raw_smp_processor_id()));
if (!suspend_wake_time)
return ~0ULL;
else
return USEC_PER_SEC * suspend_wake_time;
}
cpumask_and(&online_cpus_in_cluster,
&cluster->num_children_in_sync, cpu_online_mask);
for_each_cpu(cpu, &online_cpus_in_cluster) {
td = &per_cpu(tick_cpu_device, cpu);
if (td->evtdev->next_event.tv64 < next_event.tv64) {
next_event.tv64 = td->evtdev->next_event.tv64;
next_cpu = cpu;
}
if (from_idle && pred_time && lpm_prediction) {
history = &per_cpu(hist, cpu);
if (history->stime && (history->stime < prediction))
prediction = history->stime;
}
}
if (mask)
cpumask_copy(mask, cpumask_of(next_cpu));
if (from_idle && pred_time && lpm_prediction) {
if (prediction > ktime_to_us(ktime_get()))
*pred_time = prediction - ktime_to_us(ktime_get());
}
if (ktime_to_us(next_event) > ktime_to_us(ktime_get()))
return ktime_to_us(ktime_sub(next_event, ktime_get()));
else
return 0;
}
static int cluster_predict(struct lpm_cluster *cluster,
uint32_t *pred_us)
{
int i, j;
int ret = 0;
struct cluster_history *history = &cluster->history;
int64_t cur_time = ktime_to_us(ktime_get());
if (history->hinvalid) {
history->hinvalid = 0;
history->htmr_wkup = 1;
history->flag = 0;
return ret;
}
if (history->nsamp == MAXSAMPLES) {
for (i = 0; i < MAXSAMPLES; i++) {
if ((cur_time - history->stime[i])
> CLUST_SMPL_INVLD_TIME)
history->nsamp--;
}
}
if (history->nsamp < MAXSAMPLES) {
history->flag = 0;
return ret;
}
if (history->flag == 2)
history->flag = 0;
if (history->htmr_wkup != 1) {
uint64_t total = 0;
if (history->flag == 1) {
for (i = 0; i < MAXSAMPLES; i++)
total += history->resi[i];
do_div(total, MAXSAMPLES);
*pred_us = total;
return 2;
}
for (j = 1; j < cluster->nlevels; j++) {
uint32_t failed = 0;
total = 0;
for (i = 0; i < MAXSAMPLES; i++) {
if ((history->mode[i] == j) && (history->resi[i]
< cluster->levels[j].pwr.min_residency)) {
failed++;
total += history->resi[i];
}
}
if (failed > (MAXSAMPLES-2)) {
do_div(total, failed);
*pred_us = total;
history->flag = 1;
return 1;
}
}
}
return ret;
}
static void update_cluster_history_time(struct cluster_history *history,
int idx, uint64_t start)
{
history->entry_idx = idx;
history->entry_time = start;
}
static void update_cluster_history(struct cluster_history *history, int idx)
{
uint32_t tmr = 0;
uint32_t residency = 0;
struct lpm_cluster *cluster =
container_of(history, struct lpm_cluster, history);
if (!lpm_prediction)
return;
if ((history->entry_idx == -1) || (history->entry_idx == idx)) {
residency = ktime_to_us(ktime_get()) - history->entry_time;
history->stime[history->hptr] = history->entry_time;
} else
return;
if (history->htmr_wkup) {
if (!history->hptr)
history->hptr = MAXSAMPLES-1;
else
history->hptr--;
history->resi[history->hptr] += residency;
history->htmr_wkup = 0;
tmr = 1;
} else {
history->resi[history->hptr] = residency;
}
history->mode[history->hptr] = idx;
history->entry_idx = INT_MIN;
history->entry_time = 0;
if (history->nsamp < MAXSAMPLES)
history->nsamp++;
trace_cluster_pred_hist(cluster->cluster_name,
history->mode[history->hptr], history->resi[history->hptr],
history->hptr, tmr);
(history->hptr)++;
if (history->hptr >= MAXSAMPLES)
history->hptr = 0;
}
static void clear_cl_history_each(struct cluster_history *history)
{
int i;
for (i = 0; i < MAXSAMPLES; i++) {
history->resi[i] = 0;
history->mode[i] = -1;
history->stime[i] = 0;
}
history->hptr = 0;
history->nsamp = 0;
history->flag = 0;
history->hinvalid = 0;
history->htmr_wkup = 0;
}
static void clear_cl_predict_history(void)
{
struct lpm_cluster *cluster = lpm_root_node;
struct list_head *list;
if (!lpm_prediction)
return;
clear_cl_history_each(&cluster->history);
list_for_each(list, &cluster->child) {
struct lpm_cluster *n;
n = list_entry(list, typeof(*n), list);
clear_cl_history_each(&n->history);
}
}
static int cluster_select(struct lpm_cluster *cluster, bool from_idle,
int *ispred)
{
int best_level = -1;
int i;
struct cpumask mask;
uint32_t latency_us = ~0U;
uint32_t sleep_us;
uint32_t cpupred_us = 0, pred_us = 0;
int pred_mode = 0, predicted = 0;
if (!cluster)
return -EINVAL;
sleep_us = (uint32_t)get_cluster_sleep_time(cluster, NULL,
from_idle, &cpupred_us);
if (smp_processor_id() < 4)
cl0_sleep_us = sleep_us;
else
cl1_sleep_us = sleep_us;
if (from_idle && lpm_prediction) {
pred_mode = cluster_predict(cluster, &pred_us);
if (cpupred_us && pred_mode && (cpupred_us < pred_us))
pred_us = cpupred_us;
if (pred_us && pred_mode && (pred_us < sleep_us))
predicted = 1;
if (predicted && (pred_us == cpupred_us))
predicted = 2;
}
if (cpumask_and(&mask, cpu_online_mask, &cluster->child_cpus))
latency_us = pm_qos_request_for_cpumask(PM_QOS_CPU_DMA_LATENCY,
&mask);
/*
* If atleast one of the core in the cluster is online, the cluster
* low power modes should be determined by the idle characteristics
* even if the last core enters the low power mode as a part of
* hotplug.
*/
if (!from_idle && num_online_cpus() > 1 &&
cpumask_intersects(&cluster->child_cpus, cpu_online_mask))
from_idle = true;
for (i = 0; i < cluster->nlevels; i++) {
struct lpm_cluster_level *level = &cluster->levels[i];
struct power_params *pwr_params = &level->pwr;
if (!lpm_cluster_mode_allow(cluster, i, from_idle))
continue;
if (level->last_core_only &&
cpumask_weight(cpu_online_mask) > 1)
continue;
if (!cpumask_equal(&cluster->num_children_in_sync,
&level->num_cpu_votes))
continue;
if (from_idle && latency_us < pwr_params->latency_us)
break;
if (suspend_in_progress && from_idle && level->notify_rpm)
continue;
if (level->notify_rpm && msm_rpm_waiting_for_ack())
continue;
/*
* min_residency is max_residency of previous level+1
* if none of the previous levels are enabled,
* min_residency is time overhead for current level
*/
if (predicted ? (pred_us >= pwr_params->min_residency)
: (sleep_us >= pwr_params->min_residency))
best_level = i;
}
if ((best_level == (cluster->nlevels - 1)) && (pred_mode == 2))
cluster->history.flag = 2;
*ispred = predicted;
trace_cluster_pred_select(cluster->cluster_name, best_level, sleep_us,
latency_us, predicted, pred_us);
return best_level;
}
static void cluster_notify(struct lpm_cluster *cluster,
struct lpm_cluster_level *level, bool enter)
{
if (level->is_reset && enter)
cpu_cluster_pm_enter(cluster->aff_level);
else if (level->is_reset && !enter)
cpu_cluster_pm_exit(cluster->aff_level);
}
static int cluster_configure(struct lpm_cluster *cluster, int idx,
bool from_idle, int predicted)
{
struct lpm_cluster_level *level = &cluster->levels[idx];
int ret, i;
uint32_t sleep_us;
unsigned int cpu = raw_smp_processor_id();
spin_lock(&cluster->sync_lock);
if (smp_processor_id() < 4)
sleep_us = cl0_sleep_us;
else
sleep_us = cl1_sleep_us;
if (!cpumask_equal(&cluster->num_children_in_sync, &cluster->child_cpus)
|| is_IPI_pending(&cluster->num_children_in_sync)) {
spin_unlock(&cluster->sync_lock);
return -EPERM;
}
if (idx != cluster->default_level) {
update_debug_pc_event(CLUSTER_ENTER, idx,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], sleep_us);
trace_cluster_enter(cluster->cluster_name, idx,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], from_idle);
lpm_stats_cluster_enter(cluster->stats, idx);
if (from_idle && lpm_prediction)
update_cluster_history_time(&cluster->history, idx,
ktime_to_us(ktime_get()));
}
for (i = 0; i < cluster->ndevices; i++) {
ret = set_device_mode(cluster, i, level);
if (ret)
goto failed_set_mode;
}
if (level->notify_rpm) {
struct cpumask nextcpu, *cpumask;
uint32_t us;
us = get_cluster_sleep_time(cluster, &nextcpu,
from_idle, NULL);
cpumask = level->disable_dynamic_routing ? NULL : &nextcpu;
ret = msm_rpm_enter_sleep(0, cpumask);
if (ret) {
pr_info("Failed msm_rpm_enter_sleep() rc = %d\n", ret);
goto failed_set_mode;
}
clear_predict_history();
clear_cl_predict_history();
do_div(us, USEC_PER_SEC/SCLK_HZ);
msm_mpm_enter_sleep((uint32_t)us, from_idle, cpumask);
}
/* Notify cluster enter event after successfully config completion */
cluster_notify(cluster, level, true);
cluster->last_level = idx;
if (predicted && (idx < (cluster->nlevels - 1))) {
struct power_params *pwr_params = &cluster->levels[idx].pwr;
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu);
clusttimer_start(cluster, pwr_params->max_residency + tmr_add);
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);
}
spin_unlock(&cluster->sync_lock);
return 0;
failed_set_mode:
for (i = 0; i < cluster->ndevices; i++) {
int rc = 0;
level = &cluster->levels[cluster->default_level];
rc = set_device_mode(cluster, i, level);
BUG_ON(rc);
}
spin_unlock(&cluster->sync_lock);
return ret;
}
static void cluster_prepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle)
{
int i;
int predicted = 0;
unsigned int ncpu = raw_smp_processor_id();
if (!cluster)
return;
if (cluster->min_child_level > child_idx)
return;
spin_lock(&cluster->sync_lock);
cpumask_or(&cluster->num_children_in_sync, cpu,
&cluster->num_children_in_sync);
for (i = 0; i < cluster->nlevels; i++) {
struct lpm_cluster_level *lvl = &cluster->levels[i];
if (child_idx >= lvl->min_child_level)
cpumask_or(&lvl->num_cpu_votes, cpu,
&lvl->num_cpu_votes);
}
/*
* cluster_select() does not make any configuration changes. So its ok
* to release the lock here. If a core wakes up for a rude request,
* it need not wait for another to finish its cluster selection and
* configuration process
*/
if (!cpumask_equal(&cluster->num_children_in_sync,
&cluster->child_cpus)) {
spin_unlock(&cluster->sync_lock);
return;
}
spin_unlock(&cluster->sync_lock);
i = cluster_select(cluster, from_idle, &predicted);
if (((i < 0) || (i == cluster->default_level))
&& predicted && from_idle) {
update_cluster_history_time(&cluster->history,
-1, ktime_to_us(ktime_get()));
if (i < 0) {
struct power_params *pwr_params =
&cluster->levels[0].pwr;
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT,
&ncpu);
clusttimer_start(cluster,
pwr_params->max_residency + tmr_add);
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
&ncpu);
}
}
if (i < 0)
return;
if (cluster_configure(cluster, i, from_idle, predicted))
return;
cluster_prepare(cluster->parent, &cluster->num_children_in_sync, i,
from_idle);
}
static void cluster_unprepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle)
{
struct lpm_cluster_level *level;
bool first_cpu;
int last_level, i, ret;
if (!cluster)
return;
if (cluster->min_child_level > child_idx)
return;
spin_lock(&cluster->sync_lock);
last_level = cluster->default_level;
first_cpu = cpumask_equal(&cluster->num_children_in_sync,
&cluster->child_cpus);
cpumask_andnot(&cluster->num_children_in_sync,
&cluster->num_children_in_sync, cpu);
for (i = 0; i < cluster->nlevels; i++) {
struct lpm_cluster_level *lvl = &cluster->levels[i];
if (child_idx >= lvl->min_child_level)
cpumask_andnot(&lvl->num_cpu_votes,
&lvl->num_cpu_votes, cpu);
}
if (from_idle && first_cpu &&
(cluster->last_level == cluster->default_level))
update_cluster_history(&cluster->history, cluster->last_level);
if (!first_cpu || cluster->last_level == cluster->default_level)
goto unlock_return;
lpm_stats_cluster_exit(cluster->stats, cluster->last_level, true);
level = &cluster->levels[cluster->last_level];
if (level->notify_rpm) {
msm_rpm_exit_sleep();
msm_mpm_exit_sleep(from_idle);
}
if (smp_processor_id() < 4)
cl0_sleep_us = 0;
else
cl1_sleep_us = 0;
update_debug_pc_event(CLUSTER_EXIT, cluster->last_level,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], from_idle);
trace_cluster_exit(cluster->cluster_name, cluster->last_level,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], from_idle);
last_level = cluster->last_level;
cluster->last_level = cluster->default_level;
for (i = 0; i < cluster->ndevices; i++) {
level = &cluster->levels[cluster->default_level];
ret = set_device_mode(cluster, i, level);
BUG_ON(ret);
}
cluster_notify(cluster, &cluster->levels[last_level], false);
if (from_idle)
update_cluster_history(&cluster->history, last_level);
unlock_return:
spin_unlock(&cluster->sync_lock);
cluster_unprepare(cluster->parent, &cluster->child_cpus,
last_level, from_idle);
}
static inline void cpu_prepare(struct lpm_cluster *cluster, int cpu_index,
bool from_idle)
{
struct lpm_cpu_level *cpu_level = &cluster->cpu->levels[cpu_index];
unsigned int cpu = raw_smp_processor_id();
/* Use broadcast timer for aggregating sleep mode within a cluster.
* A broadcast timer could be used in the following scenarios
* 1) The architected timer HW gets reset during certain low power
* modes and the core relies on a external(broadcast) timer to wake up
* from sleep. This information is passed through device tree.
* 2) The CPU low power mode could trigger a system low power mode.
* The low power module relies on Broadcast timer to aggregate the
* next wakeup within a cluster, in which case, CPU switches over to
* use broadcast timer.
*/
if (from_idle && (cpu_level->use_bc_timer ||
(cpu_index >= cluster->min_child_level)))
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu);
if (from_idle && ((cpu_level->mode == MSM_PM_SLEEP_MODE_POWER_COLLAPSE)
|| (cpu_level->mode ==
MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)
|| (cpu_level->is_reset)))
cpu_pm_enter();
}
static inline void cpu_unprepare(struct lpm_cluster *cluster, int cpu_index,
bool from_idle)
{
struct lpm_cpu_level *cpu_level = &cluster->cpu->levels[cpu_index];
unsigned int cpu = raw_smp_processor_id();
if (from_idle && (cpu_level->use_bc_timer ||
(cpu_index >= cluster->min_child_level)))
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu);
if (from_idle && ((cpu_level->mode == MSM_PM_SLEEP_MODE_POWER_COLLAPSE)
|| (cpu_level->mode ==
MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE)
|| cpu_level->is_reset))
cpu_pm_exit();
}
int get_cluster_id(struct lpm_cluster *cluster, int *aff_lvl)
{
int state_id = 0;
if (!cluster)
return 0;
spin_lock(&cluster->sync_lock);
if (!cpumask_equal(&cluster->num_children_in_sync,
&cluster->child_cpus))
goto unlock_and_return;
state_id |= get_cluster_id(cluster->parent, aff_lvl);
if (cluster->last_level != cluster->default_level) {
struct lpm_cluster_level *level
= &cluster->levels[cluster->last_level];
state_id |= (level->psci_id & cluster->psci_mode_mask)
<< cluster->psci_mode_shift;
(*aff_lvl)++;
}
unlock_and_return:
spin_unlock(&cluster->sync_lock);
return state_id;
}
#if !defined(CONFIG_CPU_V7)
bool psci_enter_sleep(struct lpm_cluster *cluster, int idx, bool from_idle)
{
int affinity_level = 0;
int state_id = get_cluster_id(cluster, &affinity_level);
int power_state = PSCI_POWER_STATE(cluster->cpu->levels[idx].is_reset);
affinity_level = PSCI_AFFINITY_LEVEL(affinity_level);
if (!idx) {
wfi();
return 1;
}
state_id |= (power_state | affinity_level
| cluster->cpu->levels[idx].psci_id);
return !cpu_suspend(state_id);
}
#elif defined(CONFIG_ARM_PSCI)
bool psci_enter_sleep(struct lpm_cluster *cluster, int idx, bool from_idle)
{
int affinity_level = 0;
int state_id = get_cluster_id(cluster, &affinity_level);
int power_state = PSCI_POWER_STATE(cluster->cpu->levels[idx].is_reset);
affinity_level = PSCI_AFFINITY_LEVEL(affinity_level);
if (!idx) {
wfi();
return 1;
}
state_id |= (power_state | affinity_level
| cluster->cpu->levels[idx].psci_id);
return !cpu_suspend(state_id);
}
#else
bool psci_enter_sleep(struct lpm_cluster *cluster, int idx, bool from_idle)
{
WARN_ONCE(true, "PSCI cpu_suspend ops not supported\n");
return false;
}
#endif
static void update_history(struct cpuidle_device *dev, int idx)
{
struct lpm_history *history = &per_cpu(hist, dev->cpu);
uint32_t tmr = 0;
if (!lpm_prediction)
return;
if (history->htmr_wkup) {
if (!history->hptr)
history->hptr = MAXSAMPLES-1;
else
history->hptr--;
history->resi[history->hptr] += dev->last_residency;
history->htmr_wkup = 0;
tmr = 1;
} else
history->resi[history->hptr] = dev->last_residency;
history->mode[history->hptr] = idx;
trace_cpu_pred_hist(history->mode[history->hptr],
history->resi[history->hptr], history->hptr, tmr);
if (history->nsamp < MAXSAMPLES)
history->nsamp++;
(history->hptr)++;
if (history->hptr >= MAXSAMPLES)
history->hptr = 0;
}
static int lpm_cpuidle_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, dev->cpu);
int64_t time = ktime_to_ns(ktime_get());
bool success = true;
int idx = cpu_power_select(dev, cluster->cpu, &index);
const struct cpumask *cpumask = get_cpu_mask(dev->cpu);
struct power_params *pwr_params;
if (idx < 0) {
local_irq_enable();
return -EPERM;
}
trace_cpu_idle_rcuidle(idx, dev->cpu);
if (need_resched()) {
dev->last_residency = 0;
goto exit;
}
pwr_params = &cluster->cpu->levels[idx].pwr;
sched_set_cpu_cstate(smp_processor_id(), idx + 1,
pwr_params->energy_overhead, pwr_params->latency_us);
trace_cpu_idle_enter(idx);
cpu_prepare(cluster, idx, true);
cluster_prepare(cluster, cpumask, idx, true);
lpm_stats_cpu_enter(idx);
if (idx > 0) {
update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed,
gic_return_irq_pending(), true);
#ifdef CONFIG_SEC_DEBUG
secdbg_sched_msg("+Idle(%s)", cluster->cpu->levels[idx].name);
#endif
}
if (!use_psci)
success = msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode,
true);
else
success = psci_enter_sleep(cluster, idx, true);
if (idx > 0) {
#ifdef CONFIG_SEC_DEBUG
secdbg_sched_msg("-Idle(%s)", cluster->cpu->levels[idx].name);
#endif
update_debug_pc_event(CPU_EXIT, idx, success,
gic_return_irq_pending(), true);
}
lpm_stats_cpu_exit(idx, success);
cluster_unprepare(cluster, cpumask, idx, true);
cpu_unprepare(cluster, idx, true);
sched_set_cpu_cstate(smp_processor_id(), 0, 0, 0);
time = ktime_to_ns(ktime_get()) - time;
do_div(time, 1000);
dev->last_residency = (int)time;
trace_cpu_idle_exit(idx, success);
update_history(dev, idx);
exit:
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
local_irq_enable();
if (lpm_prediction) {
histtimer_cancel();
clusttimer_cancel();
}
return idx;
}
#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
static DEFINE_PER_CPU(struct cpuidle_device, cpuidle_dev);
static int cpuidle_register_cpu(struct cpuidle_driver *drv,
struct cpumask *mask)
{
struct cpuidle_device *device;
int cpu, ret;
if (!mask || !drv)
return -EINVAL;
for_each_cpu(cpu, mask) {
ret = cpuidle_register_cpu_driver(drv, cpu);
if (ret) {
pr_err("Failed to register cpuidle driver %d\n", ret);
goto failed_driver_register;
}
device = &per_cpu(cpuidle_dev, cpu);
device->cpu = cpu;
ret = cpuidle_register_device(device);
if (ret) {
pr_err("Failed to register cpuidle driver for cpu:%u\n",
cpu);
goto failed_driver_register;
}
}
return ret;
failed_driver_register:
for_each_cpu(cpu, mask)
cpuidle_unregister_cpu_driver(drv, cpu);
return ret;
}
#else
static int cpuidle_register_cpu(struct cpuidle_driver *drv,
struct cpumask *mask)
{
return cpuidle_register(drv, NULL);
}
#endif
static int cluster_cpuidle_register(struct lpm_cluster *cl)
{
int i = 0, ret = 0;
unsigned cpu;
struct lpm_cluster *p = NULL;
if (!cl->cpu) {
struct lpm_cluster *n;
list_for_each_entry(n, &cl->child, list) {
ret = cluster_cpuidle_register(n);
if (ret)
break;
}
return ret;
}
cl->drv = kzalloc(sizeof(*cl->drv), GFP_KERNEL);
if (!cl->drv)
return -ENOMEM;
cl->drv->name = "msm_idle";
for (i = 0; i < cl->cpu->nlevels; i++) {
struct cpuidle_state *st = &cl->drv->states[i];
struct lpm_cpu_level *cpu_level = &cl->cpu->levels[i];
snprintf(st->name, CPUIDLE_NAME_LEN, "C%u\n", i);
snprintf(st->desc, CPUIDLE_DESC_LEN, cpu_level->name);
st->flags = 0;
st->exit_latency = cpu_level->pwr.latency_us;
st->power_usage = cpu_level->pwr.ss_power;
st->target_residency = 0;
st->enter = lpm_cpuidle_enter;
}
cl->drv->state_count = cl->cpu->nlevels;
cl->drv->safe_state_index = 0;
for_each_cpu(cpu, &cl->child_cpus)
per_cpu(cpu_cluster, cpu) = cl;
for_each_possible_cpu(cpu) {
if (cpu_online(cpu))
continue;
p = per_cpu(cpu_cluster, cpu);
while (p) {
int j;
spin_lock(&p->sync_lock);
cpumask_set_cpu(cpu, &p->num_children_in_sync);
for (j = 0; j < p->nlevels; j++)
cpumask_copy(&p->levels[j].num_cpu_votes,
&p->num_children_in_sync);
spin_unlock(&p->sync_lock);
p = p->parent;
}
}
ret = cpuidle_register_cpu(cl->drv, &cl->child_cpus);
if (ret) {
kfree(cl->drv);
return -ENOMEM;
}
return 0;
}
static void register_cpu_lpm_stats(struct lpm_cpu *cpu,
struct lpm_cluster *parent)
{
const char **level_name;
int i;
level_name = kzalloc(cpu->nlevels * sizeof(*level_name), GFP_KERNEL);
if (!level_name)
return;
for (i = 0; i < cpu->nlevels; i++)
level_name[i] = cpu->levels[i].name;
lpm_stats_config_level("cpu", level_name, cpu->nlevels,
parent->stats, &parent->child_cpus);
kfree(level_name);
}
static void register_cluster_lpm_stats(struct lpm_cluster *cl,
struct lpm_cluster *parent)
{
const char **level_name;
int i;
struct lpm_cluster *child;
if (!cl)
return;
level_name = kzalloc(cl->nlevels * sizeof(*level_name), GFP_KERNEL);
if (!level_name)
return;
for (i = 0; i < cl->nlevels; i++)
level_name[i] = cl->levels[i].level_name;
cl->stats = lpm_stats_config_level(cl->cluster_name, level_name,
cl->nlevels, parent ? parent->stats : NULL, NULL);
kfree(level_name);
if (cl->cpu) {
register_cpu_lpm_stats(cl->cpu, cl);
return;
}
list_for_each_entry(child, &cl->child, list)
register_cluster_lpm_stats(child, cl);
}
static int lpm_suspend_prepare(void)
{
suspend_in_progress = true;
msm_mpm_suspend_prepare();
lpm_stats_suspend_enter();
#ifdef CONFIG_SEC_GPIO_DVS
/************************ Caution !!! ****************************
* This functiongit a must be located in appropriate SLEEP position
* in accordance with the specification of each BB vendor.
************************ Caution !!! ****************************/
gpio_dvs_check_sleepgpio();
#ifdef SECGPIO_SLEEP_DEBUGGING
/************************ Caution !!! ****************************/
/* This func. must be located in an appropriate position for GPIO SLEEP debugging
* in accordance with the specification of each BB vendor, and
* the func. must be called after calling the function "gpio_dvs_check_sleepgpio"
*/
/************************ Caution !!! ****************************/
gpio_dvs_set_sleepgpio();
#endif
#endif
#ifdef CONFIG_SEC_PM
regulator_showall_enabled();
#endif
#ifdef CONFIG_SEC_PM_DEBUG
if (msm_pm_sleep_sec_debug) {
msm_gpio_print_enabled();
qpnp_debug_suspend_show();
}
#endif
return 0;
}
static void lpm_suspend_end(void)
{
suspend_in_progress = false;
msm_mpm_suspend_wake();
lpm_stats_suspend_exit();
}
#ifdef CONFIG_SEC_PM_DEBUG
extern int sec_print_masters_stats(void);
#endif
static int lpm_suspend_enter(suspend_state_t state)
{
int cpu = raw_smp_processor_id();
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
struct lpm_cpu *lpm_cpu = cluster->cpu;
const struct cpumask *cpumask = get_cpu_mask(cpu);
int idx;
for (idx = lpm_cpu->nlevels - 1; idx >= 0; idx--) {
if (lpm_cpu_mode_allow(cpu, idx, false))
break;
}
if (idx < 0) {
pr_err("Failed suspend\n");
return 0;
}
cpu_prepare(cluster, idx, false);
cluster_prepare(cluster, cpumask, idx, false);
if (idx > 0) {
update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed,
0xdeaffeed, false);
#ifdef CONFIG_SEC_DEBUG
secdbg_sched_msg("+Suspend(s:%d)", state);
#endif
}
/*
* Print the clocks which are enabled during system suspend
* This debug information is useful to know which are the
* clocks that are enabled and preventing the system level
* LPMs(XO and Vmin).
*/
clock_debug_print_enabled();
#ifdef CONFIG_SEC_PM
wakeup_gpio_irq_flag = 1;
#endif
if (!use_psci)
msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode, false);
else
psci_enter_sleep(cluster, idx, true);
if (idx > 0) {
update_debug_pc_event(CPU_EXIT, idx, true, 0xdeaffeed,
false);
#ifdef CONFIG_SEC_DEBUG
secdbg_sched_msg("-Suspend(s:%d)", state);
#endif
}
cluster_unprepare(cluster, cpumask, idx, false);
cpu_unprepare(cluster, idx, false);
#ifdef CONFIG_SEC_PM_DEBUG
if (sec_debug_is_enabled()) {
sec_print_masters_stats();
}
#endif
return 0;
}
static const struct platform_suspend_ops lpm_suspend_ops = {
.enter = lpm_suspend_enter,
.valid = suspend_valid_only_mem,
.prepare_late = lpm_suspend_prepare,
.end = lpm_suspend_end,
};
static int lpm_probe(struct platform_device *pdev)
{
int ret;
int size;
struct kobject *module_kobj = NULL;
get_online_cpus();
lpm_root_node = lpm_of_parse_cluster(pdev);
if (IS_ERR_OR_NULL(lpm_root_node)) {
pr_err("%s(): Failed to probe low power modes\n", __func__);
put_online_cpus();
return PTR_ERR(lpm_root_node);
}
if (print_parsed_dt)
cluster_dt_walkthrough(lpm_root_node);
/*
* Register hotplug notifier before broadcast time to ensure there
* to prevent race where a broadcast timer might not be setup on for a
* core. BUG in existing code but no known issues possibly because of
* how late lpm_levels gets initialized.
*/
get_cpu();
on_each_cpu(setup_broadcast_timer, (void *)true, 1);
put_cpu();
suspend_set_ops(&lpm_suspend_ops);
hrtimer_init(&lpm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init(&histtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
cluster_timer_init(lpm_root_node);
ret = remote_spin_lock_init(&scm_handoff_lock, SCM_HANDOFF_LOCK_ID);
if (ret) {
pr_err("%s: Failed initializing scm_handoff_lock (%d)\n",
__func__, ret);
put_online_cpus();
return ret;
}
size = num_dbg_elements * sizeof(struct lpm_debug);
lpm_debug = dma_alloc_coherent(&pdev->dev, size,
&lpm_debug_phys, GFP_KERNEL);
register_cluster_lpm_stats(lpm_root_node, NULL);
ret = cluster_cpuidle_register(lpm_root_node);
put_online_cpus();
if (ret) {
pr_err("%s()Failed to register with cpuidle framework\n",
__func__);
goto failed;
}
register_hotcpu_notifier(&lpm_cpu_nblk);
module_kobj = kset_find_obj(module_kset, KBUILD_MODNAME);
if (!module_kobj) {
pr_err("%s: cannot find kobject for module %s\n",
__func__, KBUILD_MODNAME);
ret = -ENOENT;
goto failed;
}
ret = create_cluster_lvl_nodes(lpm_root_node, module_kobj);
if (ret) {
pr_err("%s(): Failed to create cluster level nodes\n",
__func__);
goto failed;
}
return 0;
failed:
free_cluster_node(lpm_root_node);
lpm_root_node = NULL;
return ret;
}
static struct of_device_id lpm_mtch_tbl[] = {
{.compatible = "qcom,lpm-levels"},
{},
};
static struct platform_driver lpm_driver = {
.probe = lpm_probe,
.driver = {
.name = "lpm-levels",
.owner = THIS_MODULE,
.of_match_table = lpm_mtch_tbl,
},
};
static int __init lpm_levels_module_init(void)
{
int rc;
rc = platform_driver_register(&lpm_driver);
if (rc) {
pr_info("Error registering %s\n", lpm_driver.driver.name);
goto fail;
}
fail:
return rc;
}
late_initcall(lpm_levels_module_init);
enum msm_pm_l2_scm_flag lpm_cpu_pre_pc_cb(unsigned int cpu)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
enum msm_pm_l2_scm_flag retflag = MSM_SCM_L2_ON;
/*
* No need to acquire the lock if probe isn't completed yet
* In the event of the hotplug happening before lpm probe, we want to
* flush the cache to make sure that L2 is flushed. In particular, this
* could cause incoherencies for a cluster architecture. This wouldn't
* affect the idle case as the idle driver wouldn't be registered
* before the probe function
*/
if (!cluster)
return MSM_SCM_L2_OFF;
/*
* Assumes L2 only. What/How parameters gets passed into TZ will
* determine how this function reports this info back in msm-pm.c
*/
spin_lock(&cluster->sync_lock);
if (!cluster->lpm_dev) {
retflag = MSM_SCM_L2_OFF;
goto unlock_and_return;
}
if (!cpumask_equal(&cluster->num_children_in_sync,
&cluster->child_cpus))
goto unlock_and_return;
if (cluster->lpm_dev)
retflag = cluster->lpm_dev->tz_flag;
/*
* The scm_handoff_lock will be release by the secure monitor.
* It is used to serialize power-collapses from this point on,
* so that both Linux and the secure context have a consistent
* view regarding the number of running cpus (cpu_count).
*
* It must be acquired before releasing the cluster lock.
*/
unlock_and_return:
update_debug_pc_event(PRE_PC_CB, retflag, 0xdeadbeef, 0xdeadbeef,
0xdeadbeef);
trace_pre_pc_cb(retflag);
remote_spin_lock_rlock_id(&scm_handoff_lock,
REMOTE_SPINLOCK_TID_START + cpu);
spin_unlock(&cluster->sync_lock);
return retflag;
}
/**
* lpm_cpu_hotplug_enter(): Called by dying CPU to terminate in low power mode
*
* @cpu: cpuid of the dying CPU
*
* Called from platform_cpu_kill() to terminate hotplug in a low power mode
*/
void lpm_cpu_hotplug_enter(unsigned int cpu)
{
enum msm_pm_sleep_mode mode = MSM_PM_SLEEP_MODE_NR;
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
int i;
int idx = -1;
/*
* If lpm isn't probed yet, try to put cpu into the one of the modes
* available
*/
if (!cluster) {
if (msm_spm_is_mode_avail(MSM_SPM_MODE_POWER_COLLAPSE)) {
mode = MSM_PM_SLEEP_MODE_POWER_COLLAPSE;
} else if (msm_spm_is_mode_avail(
MSM_SPM_MODE_RETENTION)) {
mode = MSM_PM_SLEEP_MODE_RETENTION;
} else {
pr_err("No mode avail for cpu%d hotplug\n", cpu);
BUG_ON(1);
return;
}
} else {
struct lpm_cpu *lpm_cpu;
uint32_t ss_pwr = ~0U;
lpm_cpu = cluster->cpu;
for (i = 0; i < lpm_cpu->nlevels; i++) {
if (ss_pwr < lpm_cpu->levels[i].pwr.ss_power)
continue;
ss_pwr = lpm_cpu->levels[i].pwr.ss_power;
idx = i;
mode = lpm_cpu->levels[i].mode;
}
if (mode == MSM_PM_SLEEP_MODE_NR)
return;
BUG_ON(idx < 0);
cluster_prepare(cluster, get_cpu_mask(cpu), idx, false);
}
msm_cpu_pm_enter_sleep(mode, false);
}
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