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Commit ad7eec42 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-cpuidle' 

* 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
parents f6cbe34f 37efa4b4

arch/x86/kernel/acpi/cstate.c

+5 −4
Original line number Diff line number Diff line
@@ -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;

drivers/base/cpu.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/cpuidle/governors/menu.c

+9 −2
Original line number Diff line number Diff line
@@ -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;

	}