Commit fd7c3c29 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

Merge back new cpuidle material for v4.7.

parents 625fe4f8 e93e59ce
......@@ -36,7 +36,7 @@ struct cpuidle_ops {
struct of_cpuidle_method {
const char *method;
struct cpuidle_ops *ops;
const struct cpuidle_ops *ops;
};
#define CPUIDLE_METHOD_OF_DECLARE(name, _method, _ops) \
......
......@@ -70,7 +70,7 @@ int arm_cpuidle_suspend(int index)
*
* Returns a struct cpuidle_ops pointer, NULL if not found.
*/
static struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method)
static const struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method)
{
struct of_cpuidle_method *m = __cpuidle_method_of_table;
......@@ -88,7 +88,7 @@ static struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method)
*
* Get the method name defined in the 'enable-method' property, retrieve the
* associated cpuidle_ops and do a struct copy. This copy is needed because all
* cpuidle_ops are tagged __initdata and will be unloaded after the init
* cpuidle_ops are tagged __initconst and will be unloaded after the init
* process.
*
* Return 0 on sucess, -ENOENT if no 'enable-method' is defined, -EOPNOTSUPP if
......@@ -97,7 +97,7 @@ static struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method)
static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu)
{
const char *enable_method;
struct cpuidle_ops *ops;
const struct cpuidle_ops *ops;
enable_method = of_get_property(dn, "enable-method", NULL);
if (!enable_method)
......
......@@ -173,7 +173,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
struct cpuidle_state *target_state = &drv->states[index];
bool broadcast = !!(target_state->flags & CPUIDLE_FLAG_TIMER_STOP);
ktime_t time_start, time_end;
u64 time_start, time_end;
s64 diff;
/*
......@@ -195,13 +195,13 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
sched_idle_set_state(target_state);
trace_cpu_idle_rcuidle(index, dev->cpu);
time_start = ktime_get();
time_start = local_clock();
stop_critical_timings();
entered_state = target_state->enter(dev, drv, index);
start_critical_timings();
time_end = ktime_get();
time_end = local_clock();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
/* The cpu is no longer idle or about to enter idle. */
......@@ -217,7 +217,11 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
if (!cpuidle_state_is_coupled(drv, entered_state))
local_irq_enable();
diff = ktime_to_us(ktime_sub(time_end, time_start));
/*
* local_clock() returns the time in nanosecond, let's shift
* by 10 (divide by 1024) to have microsecond based time.
*/
diff = (time_end - time_start) >> 10;
if (diff > INT_MAX)
diff = INT_MAX;
......@@ -433,6 +437,8 @@ static void __cpuidle_unregister_device(struct cpuidle_device *dev)
list_del(&dev->device_list);
per_cpu(cpuidle_devices, dev->cpu) = NULL;
module_put(drv->owner);
dev->registered = 0;
}
static void __cpuidle_device_init(struct cpuidle_device *dev)
......
......@@ -355,7 +355,7 @@ int psci_cpu_suspend_enter(unsigned long index)
/* ARM specific CPU idle operations */
#ifdef CONFIG_ARM
static struct cpuidle_ops psci_cpuidle_ops __initdata = {
static const struct cpuidle_ops psci_cpuidle_ops __initconst = {
.suspend = psci_cpu_suspend_enter,
.init = psci_dt_cpu_init_idle,
};
......
......@@ -766,6 +766,67 @@ static struct cpuidle_state knl_cstates[] = {
.enter = NULL }
};
static struct cpuidle_state bxt_cstates[] = {
{
.name = "C1-BXT",
.desc = "MWAIT 0x00",
.flags = MWAIT2flg(0x00),
.exit_latency = 2,
.target_residency = 2,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C1E-BXT",
.desc = "MWAIT 0x01",
.flags = MWAIT2flg(0x01),
.exit_latency = 10,
.target_residency = 20,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C6-BXT",
.desc = "MWAIT 0x20",
.flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 133,
.target_residency = 133,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C7s-BXT",
.desc = "MWAIT 0x31",
.flags = MWAIT2flg(0x31) | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 155,
.target_residency = 155,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C8-BXT",
.desc = "MWAIT 0x40",
.flags = MWAIT2flg(0x40) | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 1000,
.target_residency = 1000,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C9-BXT",
.desc = "MWAIT 0x50",
.flags = MWAIT2flg(0x50) | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 2000,
.target_residency = 2000,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.name = "C10-BXT",
.desc = "MWAIT 0x60",
.flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
.exit_latency = 10000,
.target_residency = 10000,
.enter = &intel_idle,
.enter_freeze = intel_idle_freeze, },
{
.enter = NULL }
};
/**
* intel_idle
* @dev: cpuidle_device
......@@ -950,6 +1011,11 @@ static const struct idle_cpu idle_cpu_knl = {
.state_table = knl_cstates,
};
static const struct idle_cpu idle_cpu_bxt = {
.state_table = bxt_cstates,
.disable_promotion_to_c1e = true,
};
#define ICPU(model, cpu) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT, (unsigned long)&cpu }
......@@ -985,6 +1051,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
ICPU(0x9e, idle_cpu_skl),
ICPU(0x55, idle_cpu_skx),
ICPU(0x57, idle_cpu_knl),
ICPU(0x5c, idle_cpu_bxt),
{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids);
......@@ -1075,6 +1142,73 @@ static void ivt_idle_state_table_update(void)
/* else, 1 and 2 socket systems use default ivt_cstates */
}
/*
* Translate IRTL (Interrupt Response Time Limit) MSR to usec
*/
static unsigned int irtl_ns_units[] = {
1, 32, 1024, 32768, 1048576, 33554432, 0, 0 };
static unsigned long long irtl_2_usec(unsigned long long irtl)
{
unsigned long long ns;
ns = irtl_ns_units[(irtl >> 10) & 0x3];
return div64_u64((irtl & 0x3FF) * ns, 1000);
}
/*
* bxt_idle_state_table_update(void)
*
* On BXT, we trust the IRTL to show the definitive maximum latency
* We use the same value for target_residency.
*/
static void bxt_idle_state_table_update(void)
{
unsigned long long msr;
rdmsrl(MSR_PKGC6_IRTL, msr);
if (msr) {
unsigned int usec = irtl_2_usec(msr);
bxt_cstates[2].exit_latency = usec;
bxt_cstates[2].target_residency = usec;
}
rdmsrl(MSR_PKGC7_IRTL, msr);
if (msr) {
unsigned int usec = irtl_2_usec(msr);
bxt_cstates[3].exit_latency = usec;
bxt_cstates[3].target_residency = usec;
}
rdmsrl(MSR_PKGC8_IRTL, msr);
if (msr) {
unsigned int usec = irtl_2_usec(msr);
bxt_cstates[4].exit_latency = usec;
bxt_cstates[4].target_residency = usec;
}
rdmsrl(MSR_PKGC9_IRTL, msr);
if (msr) {
unsigned int usec = irtl_2_usec(msr);
bxt_cstates[5].exit_latency = usec;
bxt_cstates[5].target_residency = usec;
}
rdmsrl(MSR_PKGC10_IRTL, msr);
if (msr) {
unsigned int usec = irtl_2_usec(msr);
bxt_cstates[6].exit_latency = usec;
bxt_cstates[6].target_residency = usec;
}
}
/*
* sklh_idle_state_table_update(void)
*
......@@ -1130,6 +1264,9 @@ static void intel_idle_state_table_update(void)
case 0x3e: /* IVT */
ivt_idle_state_table_update();
break;
case 0x5c: /* BXT */
bxt_idle_state_table_update();
break;
case 0x5e: /* SKL-H */
sklh_idle_state_table_update();
break;
......
......@@ -274,7 +274,7 @@ static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
return per_cpu(cpu_spm_drv, cpu) ? 0 : -ENXIO;
}
static struct cpuidle_ops qcom_cpuidle_ops __initdata = {
static const struct cpuidle_ops qcom_cpuidle_ops __initconst = {
.suspend = qcom_idle_enter,
.init = qcom_cpuidle_init,
};
......
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