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kernel_samsung_sm7125/drivers/cpuidle/lpm-levels-legacy.c

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/* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
*
* 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/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/dma-mapping.h>
#include <linux/coresight-cti.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/cpu_pm.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <soc/qcom/spm.h>
#include <soc/qcom/pm-legacy.h>
#include <soc/qcom/rpm-notifier.h>
#include <soc/qcom/event_timer.h>
#include <soc/qcom/lpm-stats.h>
#include <soc/qcom/lpm_levels.h>
#include <soc/qcom/jtag.h>
#include <asm/cputype.h>
#include <asm/arch_timer.h>
#include <asm/cacheflush.h>
#include <asm/suspend.h>
#include "lpm-levels-legacy.h"
#include "lpm-workarounds.h"
#include <trace/events/power.h>
#define CREATE_TRACE_POINTS
#include <trace/events/trace_msm_low_power.h>
#if defined(CONFIG_COMMON_CLK)
#include "../clk/clk.h"
#elif defined(CONFIG_COMMON_CLK_MSM)
#include "../../drivers/clk/msm/clock.h"
#endif /* CONFIG_COMMON_CLK */
#include <soc/qcom/minidump.h>
#define SCLK_HZ (32768)
#define PSCI_POWER_STATE(reset) (reset << 30)
#define PSCI_AFFINITY_LEVEL(lvl) ((lvl & 0x3) << 24)
#define MUTEX_NUM_PID 128
#define MUTEX_TID_START MUTEX_NUM_PID
#define SCM_HANDOFF_LOCK_ID 7
/* sfpb implementation for hardware spinlock usage */
static phys_addr_t reg_base;
static uint32_t reg_size;
static uint32_t lock_size;
static void __iomem *hw_mutex_reg_base;
struct mutex_reg {
volatile uint32_t regaddr;
};
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,
CPU_HP_STARTING,
CPU_HP_DYING,
};
struct lpm_debug {
u64 time;
enum debug_event evt;
int cpu;
uint32_t arg1;
uint32_t arg2;
uint32_t arg3;
uint32_t arg4;
};
static struct system_pm_ops *sys_pm_ops;
struct lpm_cluster *lpm_root_node;
static DEFINE_PER_CPU(struct lpm_cluster*, cpu_cluster);
static bool suspend_in_progress;
static struct hrtimer lpm_hrtimer;
static struct lpm_debug *lpm_debug;
static phys_addr_t lpm_debug_phys;
static const int num_dbg_elements = 0x100;
static void cluster_unprepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle,
int64_t time, bool success);
static void cluster_prepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle,
int64_t time);
static bool menu_select;
module_param_named(
menu_select, menu_select, bool, 0664
);
static bool print_parsed_dt;
module_param_named(
print_parsed_dt, print_parsed_dt, bool, 0664
);
static bool sleep_disabled;
module_param_named(sleep_disabled,
sleep_disabled, bool, 0664);
s32 msm_cpuidle_get_deep_idle_latency(void)
{
return 10;
}
EXPORT_SYMBOL(msm_cpuidle_get_deep_idle_latency);
uint32_t register_system_pm_ops(struct system_pm_ops *pm_ops)
{
if (sys_pm_ops)
return -EUSERS;
sys_pm_ops = pm_ops;
return 0;
}
static uint32_t least_cluster_latency(struct lpm_cluster *cluster,
struct latency_level *lat_level)
{
struct list_head *list;
struct lpm_cluster_level *level;
struct lpm_cluster *n;
struct power_params *pwr_params;
uint32_t latency = 0;
int i;
if (!cluster->list.next) {
for (i = 0; i < cluster->nlevels; i++) {
level = &cluster->levels[i];
pwr_params = &level->pwr;
if (lat_level->reset_level == level->reset_level) {
if ((latency > pwr_params->latency_us)
|| (!latency))
latency = pwr_params->latency_us;
break;
}
}
} else {
list_for_each(list, &cluster->parent->child) {
n = list_entry(list, typeof(*n), list);
if (lat_level->level_name) {
if (strcmp(lat_level->level_name,
n->cluster_name))
continue;
}
for (i = 0; i < n->nlevels; i++) {
level = &n->levels[i];
pwr_params = &level->pwr;
if (lat_level->reset_level ==
level->reset_level) {
if ((latency > pwr_params->latency_us)
|| (!latency))
latency =
pwr_params->latency_us;
break;
}
}
}
}
return latency;
}
static uint32_t least_cpu_latency(struct list_head *child,
struct latency_level *lat_level)
{
struct list_head *list;
struct lpm_cpu_level *level;
struct power_params *pwr_params;
struct lpm_cpu *cpu;
struct lpm_cluster *n;
uint32_t latency = 0;
int i;
list_for_each(list, child) {
n = list_entry(list, typeof(*n), list);
if (lat_level->level_name) {
if (strcmp(lat_level->level_name, n->cluster_name))
continue;
}
cpu = n->cpu;
for (i = 0; i < cpu->nlevels; i++) {
level = &cpu->levels[i];
pwr_params = &level->pwr;
if (lat_level->reset_level == level->reset_level) {
if ((latency > pwr_params->latency_us)
|| (!latency))
latency = pwr_params->latency_us;
break;
}
}
}
return latency;
}
static struct lpm_cluster *cluster_aff_match(struct lpm_cluster *cluster,
int affinity_level)
{
struct lpm_cluster *n;
if ((cluster->aff_level == affinity_level)
|| ((cluster->cpu) && (affinity_level == 0)))
return cluster;
else if (!cluster->cpu) {
n = list_entry(cluster->child.next, typeof(*n), list);
return cluster_aff_match(n, affinity_level);
} else
return NULL;
}
int lpm_get_latency(struct latency_level *level, uint32_t *latency)
{
struct lpm_cluster *cluster;
uint32_t val;
if (!lpm_root_node) {
pr_err("%s: lpm_probe not completed\n", __func__);
return -EAGAIN;
}
if ((level->affinity_level < 0)
|| (level->affinity_level > lpm_root_node->aff_level)
|| (level->reset_level < LPM_RESET_LVL_RET)
|| (level->reset_level > LPM_RESET_LVL_PC)
|| !latency)
return -EINVAL;
cluster = cluster_aff_match(lpm_root_node, level->affinity_level);
if (!cluster) {
pr_err("%s:No matching cluster found for affinity_level:%d\n",
__func__, level->affinity_level);
return -EINVAL;
}
if (level->affinity_level == 0)
val = least_cpu_latency(&cluster->parent->child, level);
else
val = least_cluster_latency(cluster, level);
if (!val) {
pr_err("%s:No mode with affinity_level:%d reset_level:%d\n",
__func__, level->affinity_level, level->reset_level);
return -EINVAL;
}
*latency = val;
return 0;
}
EXPORT_SYMBOL(lpm_get_latency);
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 enum hrtimer_restart lpm_hrtimer_cb(struct hrtimer *h)
{
return HRTIMER_NORESTART;
}
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,
struct lpm_cluster_level *level)
{
int lpm = mode;
int rc = 0;
bool notify_rpm = level->notify_rpm;
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_STANDALONE_POWER_COLLAPSE:
case MSM_SPM_MODE_POWER_COLLAPSE:
case MSM_SPM_MODE_FASTPC:
if (level->no_cache_flush)
cpu_ops->tz_flag = MSM_SCM_L2_GDHS;
else
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;
}
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,
struct lpm_cluster_level *level)
{
bool notify_rpm = level->notify_rpm;
struct low_power_ops *cpu_ops = per_cpu(cpu_cluster,
smp_processor_id())->lpm_dev;
switch (mode) {
case MSM_SPM_MODE_STANDALONE_POWER_COLLAPSE:
case MSM_SPM_MODE_POWER_COLLAPSE:
case MSM_SPM_MODE_FASTPC:
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,
struct lpm_cluster_level *level)
{
bool notify_rpm = level->notify_rpm;
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);
else
return -EINVAL;
}
static int cpu_power_select(struct cpuidle_device *dev,
struct lpm_cpu *cpu)
{
int best_level = 0;
uint32_t latency_us = pm_qos_request_for_cpu(PM_QOS_CPU_DMA_LATENCY,
dev->cpu);
ktime_t delta_next;
s64 sleep_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next));
uint32_t modified_time_us = 0;
uint32_t next_event_us = 0;
int i;
uint32_t lvl_latency_us = 0;
uint32_t *residency = get_per_cpu_max_residency(dev->cpu);
if (!cpu)
return best_level;
if ((sleep_disabled && !cpu_isolated(dev->cpu)) || sleep_us < 0)
return 0;
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;
uint32_t next_wakeup_us = (uint32_t)sleep_us;
enum msm_pm_sleep_mode mode = level->mode;
bool allow;
allow = lpm_cpu_mode_allow(dev->cpu, i, true);
if (!allow)
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;
}
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 (next_wakeup_us <= residency[i])
break;
}
if (modified_time_us)
msm_pm_set_timer(modified_time_us);
trace_cpu_power_select(best_level, sleep_us, latency_us, next_event_us);
return best_level;
}
static uint64_t get_cluster_sleep_time(struct lpm_cluster *cluster,
struct cpumask *mask, bool from_idle)
{
int cpu;
int next_cpu = raw_smp_processor_id();
ktime_t next_event;
struct cpumask online_cpus_in_cluster;
next_event = KTIME_MAX;
if (!from_idle) {
if (mask)
cpumask_copy(mask, cpumask_of(raw_smp_processor_id()));
return ~0ULL;
}
cpumask_and(&online_cpus_in_cluster,
&cluster->num_children_in_sync, cpu_online_mask);
for_each_cpu(cpu, &online_cpus_in_cluster) {
ktime_t *next_event_c;
next_event_c = get_next_event_cpu(cpu);
if (*next_event_c < next_event) {
next_event = *next_event_c;
next_cpu = cpu;
}
}
if (mask)
cpumask_copy(mask, cpumask_of(next_cpu));
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_select(struct lpm_cluster *cluster, bool from_idle)
{
int best_level = -1;
int i;
struct cpumask mask;
uint32_t latency_us = ~0U;
uint32_t sleep_us;
if (!cluster)
return -EINVAL;
sleep_us = (uint32_t)get_cluster_sleep_time(cluster, NULL, from_idle);
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 (sleep_us < pwr_params->time_overhead_us)
break;
if (suspend_in_progress && from_idle && level->notify_rpm)
continue;
if (level->notify_rpm) {
if (!(sys_pm_ops && sys_pm_ops->sleep_allowed))
continue;
if (!sys_pm_ops->sleep_allowed())
continue;
}
best_level = i;
if (from_idle && sleep_us <= pwr_params->max_residency)
break;
}
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 unsigned int get_next_online_cpu(bool from_idle)
{
unsigned int cpu;
ktime_t next_event;
unsigned int next_cpu = raw_smp_processor_id();
if (!from_idle)
return next_cpu;
next_event = KTIME_MAX;
for_each_online_cpu(cpu) {
ktime_t *next_event_c;
next_event_c = get_next_event_cpu(cpu);
if (*next_event_c < next_event) {
next_event = *next_event_c;
next_cpu = cpu;
}
}
return next_cpu;
}
static int cluster_configure(struct lpm_cluster *cluster, int idx,
bool from_idle)
{
struct lpm_cluster_level *level = &cluster->levels[idx];
struct cpumask cpumask;
unsigned int cpu;
int ret, i;
if (!cpumask_equal(&cluster->num_children_in_sync, &cluster->child_cpus)
|| is_IPI_pending(&cluster->num_children_in_sync)) {
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], from_idle);
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);
}
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;
cpu = get_next_online_cpu(from_idle);
cpumask_copy(&cpumask, cpumask_of(cpu));
nextcpu = level->disable_dynamic_routing ? NULL : &cpumask;
if (sys_pm_ops && sys_pm_ops->enter) {
ret = sys_pm_ops->enter(nextcpu);
if (ret)
goto failed_set_mode;
}
if (cluster->no_saw_devices && !use_psci)
msm_spm_set_rpm_hs(true);
}
/* Notify cluster enter event after successfully config completion */
cluster_notify(cluster, level, true);
cluster->last_level = idx;
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);
WARN_ON(rc);
}
return ret;
}
static void cluster_prepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle,
int64_t start_time)
{
int i;
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))
goto failed;
i = cluster_select(cluster, from_idle);
if (i < 0)
goto failed;
if (cluster_configure(cluster, i, from_idle))
goto failed;
cluster->stats->sleep_time = start_time;
cluster_prepare(cluster->parent, &cluster->num_children_in_sync, i,
from_idle, start_time);
spin_unlock(&cluster->sync_lock);
if (!use_psci) {
struct lpm_cluster_level *level = &cluster->levels[i];
if (level->notify_rpm)
if (sys_pm_ops && sys_pm_ops->update_wakeup)
sys_pm_ops->update_wakeup(from_idle);
}
return;
failed:
spin_unlock(&cluster->sync_lock);
cluster->stats->sleep_time = 0;
}
static void cluster_unprepare(struct lpm_cluster *cluster,
const struct cpumask *cpu, int child_idx, bool from_idle,
int64_t end_time, bool success)
{
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 (!first_cpu || cluster->last_level == cluster->default_level)
goto unlock_return;
if (cluster->stats->sleep_time)
cluster->stats->sleep_time = end_time -
cluster->stats->sleep_time;
lpm_stats_cluster_exit(cluster->stats, cluster->last_level, success);
level = &cluster->levels[cluster->last_level];
if (level->notify_rpm) {
if (sys_pm_ops && sys_pm_ops->exit)
sys_pm_ops->exit(success);
/* If RPM bumps up CX to turbo, unvote CX turbo vote
* during exit of rpm assisted power collapse to
* reduce the power impact
*/
lpm_wa_cx_unvote_send();
if (cluster->no_saw_devices && !use_psci)
msm_spm_set_rpm_hs(false);
}
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);
WARN_ON(ret);
}
cluster_notify(cluster, &cluster->levels[last_level], false);
cluster_unprepare(cluster->parent, &cluster->child_cpus,
last_level, from_idle, end_time, success);
unlock_return:
spin_unlock(&cluster->sync_lock);
}
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];
bool jtag_save_restore =
cluster->cpu->levels[cpu_index].jtag_save_restore;
/* 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)))
tick_broadcast_enter();
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();
/*
* Save JTAG registers for 8996v1.0 & 8996v2.x in C4 LPM
*/
if (jtag_save_restore)
msm_jtag_save_state();
}
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];
bool jtag_save_restore =
cluster->cpu->levels[cpu_index].jtag_save_restore;
if (from_idle && (cpu_level->use_bc_timer ||
(cpu_index >= cluster->min_child_level)))
tick_broadcast_exit();
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();
/*
* Restore JTAG registers for 8996v1.0 & 8996v2.x in C4 LPM
*/
if (jtag_save_restore)
msm_jtag_restore_state();
}
#if defined(CONFIG_ARM_PSCI) || !defined(CONFIG_CPU_V7)
static 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;
}
#endif
#if !defined(CONFIG_CPU_V7)
asmlinkage int __invoke_psci_fn_smc(u64, u64, u64, u64);
static bool psci_enter_sleep(struct lpm_cluster *cluster,
int idx, bool from_idle)
{
bool ret;
/*
* idx = 0 is the default LPM state
*/
if (!idx) {
stop_critical_timings();
wfi();
start_critical_timings();
ret = true;
} else {
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);
bool success = false;
if (cluster->cpu->levels[idx].hyp_psci) {
stop_critical_timings();
__invoke_psci_fn_smc(0xC4000021, 0, 0, 0);
start_critical_timings();
return 1;
}
affinity_level = PSCI_AFFINITY_LEVEL(affinity_level);
state_id |= (power_state | affinity_level
| cluster->cpu->levels[idx].psci_id);
update_debug_pc_event(CPU_ENTER, state_id,
0xdeaffeed, 0xdeaffeed, true);
stop_critical_timings();
success = !arm_cpuidle_suspend(state_id);
start_critical_timings();
update_debug_pc_event(CPU_EXIT, state_id,
success, 0xdeaffeed, true);
ret = success;
}
return ret;
}
#elif defined(CONFIG_ARM_PSCI)
static bool psci_enter_sleep(struct lpm_cluster *cluster,
int idx, bool from_idle)
{
bool ret;
if (!idx) {
stop_critical_timings();
wfi();
start_critical_timings();
ret = true;
} else {
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);
bool success = false;
affinity_level = PSCI_AFFINITY_LEVEL(affinity_level);
state_id |= (power_state | affinity_level
| cluster->cpu->levels[idx].psci_id);
update_debug_pc_event(CPU_ENTER, state_id,
0xdeaffeed, 0xdeaffeed, true);
stop_critical_timings();
success = !arm_cpuidle_suspend(state_id);
start_critical_timings();
update_debug_pc_event(CPU_EXIT, state_id,
success, 0xdeaffeed, true);
ret = success;
}
return ret;
}
#else
static 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 int lpm_cpuidle_select(struct cpuidle_driver *drv,
struct cpuidle_device *dev, bool *stop_tick)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, dev->cpu);
int idx;
if (!cluster)
return 0;
idx = cpu_power_select(dev, cluster->cpu);
return idx;
}
static int lpm_cpuidle_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, dev->cpu);
bool success = true;
const struct cpumask *cpumask = get_cpu_mask(dev->cpu);
ktime_t start = ktime_get();
int64_t start_time = ktime_to_ns(ktime_get()), end_time;
if (idx < 0)
return -EINVAL;
cpu_prepare(cluster, idx, true);
cluster_prepare(cluster, cpumask, idx, true, ktime_to_ns(ktime_get()));
trace_cpu_idle_enter(idx);
lpm_stats_cpu_enter(idx, start_time);
if (need_resched())
goto exit;
if (!use_psci) {
if (idx > 0)
update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed,
0xdeaffeed, true);
success = msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode,
true);
if (idx > 0)
update_debug_pc_event(CPU_EXIT, idx, success,
0xdeaffeed, true);
} else {
success = psci_enter_sleep(cluster, idx, true);
}
exit:
end_time = ktime_to_ns(ktime_get());
lpm_stats_cpu_exit(idx, end_time, success);
cluster_unprepare(cluster, cpumask, idx, true, end_time, success);
cpu_unprepare(cluster, idx, true);
trace_cpu_idle_exit(idx, success);
dev->last_residency = ktime_us_delta(ktime_get(), start);
local_irq_enable();
return idx;
}
#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
static int cpuidle_register_cpu(struct cpuidle_driver *drv,
struct cpumask *mask)
{
struct cpuidle_device *device;
int cpu, ret;
if (!mask || !drv)
return -EINVAL;
drv->cpumask = mask;
ret = cpuidle_register_driver(drv);
if (ret) {
pr_err("Failed to register cpuidle driver %d\n", ret);
goto failed_driver_register;
}
for_each_cpu(cpu, mask) {
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_driver(drv);
return ret;
}
#else
static int cpuidle_register_cpu(struct cpuidle_driver *drv,
struct cpumask *mask)
{
return cpuidle_register(drv, NULL);
}
#endif
static struct cpuidle_governor lpm_governor = {
.name = "qcom",
.rating = 30,
.select = lpm_cpuidle_select,
};
static int cluster_cpuidle_register(struct lpm_cluster *cl)
{
int i = 0, ret = 0;
unsigned int 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, "%s", 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;
}
/**
* init_lpm - initializes the governor
*/
static int __init init_lpm(void)
{
return cpuidle_register_governor(&lpm_governor);
}
postcore_initcall(init_lpm);
static void register_cpu_lpm_stats(struct lpm_cpu *cpu,
struct lpm_cluster *parent)
{
const char **level_name;
int i;
level_name = kcalloc(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 = kcalloc(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;
lpm_stats_suspend_enter();
return 0;
}
static void lpm_suspend_wake(void)
{
suspend_in_progress = false;
lpm_stats_suspend_exit();
}
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;
bool success = true;
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, 0);
if (idx > 0)
update_debug_pc_event(CPU_ENTER, idx, 0xdeaffeed,
0xdeaffeed, false);
/*
* 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(true);
if (!use_psci)
msm_cpu_pm_enter_sleep(cluster->cpu->levels[idx].mode, false);
else
success = psci_enter_sleep(cluster, idx, true);
if (idx > 0)
update_debug_pc_event(CPU_EXIT, idx, true, 0xdeaffeed,
false);
cluster_unprepare(cluster, cpumask, idx, false, 0, success);
cpu_unprepare(cluster, idx, false);
return 0;
}
static int lpm_dying_cpu(unsigned int cpu)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
update_debug_pc_event(CPU_HP_DYING, cpu,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], false);
cluster_prepare(cluster, get_cpu_mask(cpu), NR_LPM_LEVELS, false, 0);
return 0;
}
static int lpm_starting_cpu(unsigned int cpu)
{
struct lpm_cluster *cluster = per_cpu(cpu_cluster, cpu);
update_debug_pc_event(CPU_HP_STARTING, cpu,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], false);
cluster_unprepare(cluster, get_cpu_mask(cpu), NR_LPM_LEVELS,
false, 0, true);
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,
.wake = lpm_suspend_wake,
};
static int init_hw_mutex(struct device_node *node)
{
struct resource r;
int rc;
static uint32_t lock_count;
rc = of_address_to_resource(node, 0, &r);
if (rc) {
pr_err("Failed to get resource\n");
return 1;
}
rc = of_property_read_u32(node, "qcom,num-locks", &lock_count);
if (rc) {
pr_err("Failed to get num-locks property\n");
return 1;
}
reg_base = r.start;
reg_size = (uint32_t)(resource_size(&r));
lock_size = reg_size / lock_count;
return 0;
}
static int lpm_probe(struct platform_device *pdev)
{
int ret;
int size;
struct kobject *module_kobj = NULL;
struct md_region md_entry;
struct device_node *node;
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.
*/
suspend_set_ops(&lpm_suspend_ops);
hrtimer_init(&lpm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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;
}
ret = cpuhp_setup_state(CPUHP_AP_QCOM_SLEEP_STARTING,
"AP_QCOM_SLEEP_STARTING",
lpm_starting_cpu, lpm_dying_cpu);
if (ret)
goto failed;
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;
}
/* Add lpm_debug to Minidump*/
strlcpy(md_entry.name, "KLPMDEBUG", sizeof(md_entry.name));
md_entry.virt_addr = (uintptr_t)lpm_debug;
md_entry.phys_addr = lpm_debug_phys;
md_entry.size = size;
if (msm_minidump_add_region(&md_entry))
pr_info("Failed to add lpm_debug in Minidump\n");
node = of_find_node_by_name(NULL, "qcom,ipc-spinlock");
if (!node) {
pr_err("Failed to find ipc-spinlock node\n");
ret = -ENODEV;
goto failed;
}
if (init_hw_mutex(node)) {
ret = -EINVAL;
of_node_put(node);
goto failed;
}
hw_mutex_reg_base = ioremap(reg_base, reg_size);
if (!hw_mutex_reg_base) {
pr_err("ioremap failed\n");
ret = -ENOMEM;
of_node_put(node);
goto failed;
}
of_node_put(node);
return 0;
failed:
free_cluster_node(lpm_root_node);
lpm_root_node = NULL;
return ret;
}
static const 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);
static void mutex_reg_write(uint32_t tid)
{
struct mutex_reg *lock;
lock = hw_mutex_reg_base + (SCM_HANDOFF_LOCK_ID * lock_size);
do {
writel_relaxed(tid, lock);
/* barrier for proper semantics */
smp_mb();
} while (readl_relaxed(lock) != tid);
}
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;
uint32_t tid;
/*
* 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);
tid = MUTEX_TID_START + cpu;
mutex_reg_write(tid);
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_FASTPC)) {
mode = MSM_PM_SLEEP_MODE_FASTPC;
} 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);
WARN_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;
WARN_ON(idx < 0);
cluster_prepare(cluster, get_cpu_mask(cpu), idx, false, 0);
}
msm_cpu_pm_enter_sleep(mode, false);
}