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Merge branch 'pm-cpuidle'

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* pm-cpuidle:
  CPU / PM: expose pm_qos_resume_latency for CPUs
  cpuidle/menu: add per CPU PM QoS resume latency consideration
  cpuidle/menu: stop seeking deeper idle if current state is deep enough
  ACPI / idle: small formatting fixes
This commit is contained in:
Rafael J. Wysocki 2017-02-20 14:23:21 +01:00
commit ad7eec4244
3 changed files with 16 additions and 6 deletions
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9
arch/x86/kernel/acpi/cstate.c
View File

@ -12,7 +12,6 @@
#include <linux/sched.h>
#include <acpi/processor.h>
#include <asm/acpi.h>
#include <asm/mwait.h>
#include <asm/special_insns.h>
@ -89,7 +88,8 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
retval = 0;
/* If the HW does not support any sub-states in this C-state */
if (num_cstate_subtype == 0) {
pr_warn(FW_BUG "ACPI MWAIT C-state 0x%x not supported by HW (0x%x)\n", cx->address, edx_part);
pr_warn(FW_BUG "ACPI MWAIT C-state 0x%x not supported by HW (0x%x)\n",
cx->address, edx_part);
retval = -1;
goto out;
}
@ -104,8 +104,8 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
if (!mwait_supported[cstate_type]) {
mwait_supported[cstate_type] = 1;
printk(KERN_DEBUG
"Monitor-Mwait will be used to enter C-%d "
"state\n", cx->type);
"Monitor-Mwait will be used to enter C-%d state\n",
cx->type);
}
snprintf(cx->desc,
ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
@ -166,6 +166,7 @@ EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_enter);
static int __init ffh_cstate_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
if (c->x86_vendor != X86_VENDOR_INTEL)
return -1;

2
drivers/base/cpu.c
View File

@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/cpufeature.h>
#include <linux/tick.h>
#include <linux/pm_qos.h>
#include "base.h"
@ -376,6 +377,7 @@ int register_cpu(struct cpu *cpu, int num)
per_cpu(cpu_sys_devices, num) = &cpu->dev;
register_cpu_under_node(num, cpu_to_node(num));
dev_pm_qos_expose_latency_limit(&cpu->dev, 0);
return 0;
}

11
drivers/cpuidle/governors/menu.c
View File

@ -19,6 +19,7 @@
#include <linux/tick.h>
#include <linux/sched.h>
#include <linux/math64.h>
#include <linux/cpu.h>
/*
* Please note when changing the tuning values:
@ -280,17 +281,23 @@ static unsigned int get_typical_interval(struct menu_device *data)
static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct menu_device *data = this_cpu_ptr(&menu_devices);
struct device *device = get_cpu_device(dev->cpu);
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
int i;
unsigned int interactivity_req;
unsigned int expected_interval;
unsigned long nr_iowaiters, cpu_load;
int resume_latency = dev_pm_qos_read_value(device);
if (data->needs_update) {
menu_update(drv, dev);
data->needs_update = 0;
}
/* resume_latency is 0 means no restriction */
if (resume_latency && resume_latency < latency_req)
latency_req = resume_latency;
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
@ -357,9 +364,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
if (s->disabled || su->disable)
continue;
if (s->target_residency > data->predicted_us)
continue;
break;
if (s->exit_latency > latency_req)
continue;
break;
data->last_state_idx = i;
}