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Merge branches 'pm-cpuidle' and 'pm-cpufreq'

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* pm-cpuidle:
  cpuidle: menu: Remove get_loadavg() from the performance multiplier
  sched: Factor out nr_iowait and nr_iowait_cpu

* pm-cpufreq:
  cpufreq: remove unused arm_big_little_dt driver
  cpufreq: drop ARM_BIG_LITTLE_CPUFREQ support for ARM64
  cpufreq: intel_pstate: Fix compilation for !CONFIG_ACPI
This commit is contained in:
Rafael J. Wysocki 2018-10-30 08:47:14 +01:00
commit c4ac688993
8 changed files with 31 additions and 162 deletions
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1
MAINTAINERS
View File

@ -3838,7 +3838,6 @@ W: http://www.arm.com/products/processors/technologies/biglittleprocessing.php
S: Maintained
F: drivers/cpufreq/arm_big_little.h
F: drivers/cpufreq/arm_big_little.c
F: drivers/cpufreq/arm_big_little_dt.c
CPU POWER MONITORING SUBSYSTEM
M: Thomas Renninger <trenn@suse.com>

9
drivers/cpufreq/Kconfig.arm
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@ -28,20 +28,13 @@ config ARM_ARMADA_37XX_CPUFREQ
# big LITTLE core layer and glue drivers
config ARM_BIG_LITTLE_CPUFREQ
tristate "Generic ARM big LITTLE CPUfreq driver"
depends on (ARM_CPU_TOPOLOGY || ARM64) && HAVE_CLK
depends on ARM_CPU_TOPOLOGY && HAVE_CLK
# if CPU_THERMAL is on and THERMAL=m, ARM_BIT_LITTLE_CPUFREQ cannot be =y
depends on !CPU_THERMAL || THERMAL
select PM_OPP
help
This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
config ARM_DT_BL_CPUFREQ
tristate "Generic probing via DT for ARM big LITTLE CPUfreq driver"
depends on ARM_BIG_LITTLE_CPUFREQ && OF
help
This enables probing via DT for Generic CPUfreq driver for ARM
big.LITTLE platform. This gets frequency tables from DT.
config ARM_SCPI_CPUFREQ
tristate "SCPI based CPUfreq driver"
depends on ARM_SCPI_PROTOCOL && COMMON_CLK_SCPI

3
drivers/cpufreq/Makefile
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@ -48,9 +48,6 @@ obj-$(CONFIG_X86_SFI_CPUFREQ) += sfi-cpufreq.o
##################################################################################
# ARM SoC drivers
obj-$(CONFIG_ARM_BIG_LITTLE_CPUFREQ) += arm_big_little.o
# big LITTLE per platform glues. Keep DT_BL_CPUFREQ as the last entry in all big
# LITTLE drivers, so that it is probed last.
obj-$(CONFIG_ARM_DT_BL_CPUFREQ) += arm_big_little_dt.o
obj-$(CONFIG_ARM_ARMADA_37XX_CPUFREQ) += armada-37xx-cpufreq.o
obj-$(CONFIG_ARM_BRCMSTB_AVS_CPUFREQ) += brcmstb-avs-cpufreq.o

100
drivers/cpufreq/arm_big_little_dt.c
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@ -1,100 +0,0 @@
/*
* Generic big.LITTLE CPUFreq Interface driver
*
* It provides necessary ops to arm_big_little cpufreq driver and gets
* Frequency information from Device Tree. Freq table in DT must be in KHz.
*
* Copyright (C) 2013 Linaro.
* Viresh Kumar <viresh.kumar@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpufreq.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "arm_big_little.h"
/* get cpu node with valid operating-points */
static struct device_node *get_cpu_node_with_valid_op(int cpu)
{
struct device_node *np = of_cpu_device_node_get(cpu);
if (!of_get_property(np, "operating-points", NULL)) {
of_node_put(np);
np = NULL;
}
return np;
}
static int dt_get_transition_latency(struct device *cpu_dev)
{
struct device_node *np;
u32 transition_latency = CPUFREQ_ETERNAL;
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_info("Failed to find cpu node. Use CPUFREQ_ETERNAL transition latency\n");
return CPUFREQ_ETERNAL;
}
of_property_read_u32(np, "clock-latency", &transition_latency);
of_node_put(np);
pr_debug("%s: clock-latency: %d\n", __func__, transition_latency);
return transition_latency;
}
static const struct cpufreq_arm_bL_ops dt_bL_ops = {
.name = "dt-bl",
.get_transition_latency = dt_get_transition_latency,
.init_opp_table = dev_pm_opp_of_cpumask_add_table,
.free_opp_table = dev_pm_opp_of_cpumask_remove_table,
};
static int generic_bL_probe(struct platform_device *pdev)
{
struct device_node *np;
np = get_cpu_node_with_valid_op(0);
if (!np)
return -ENODEV;
of_node_put(np);
return bL_cpufreq_register(&dt_bL_ops);
}
static int generic_bL_remove(struct platform_device *pdev)
{
bL_cpufreq_unregister(&dt_bL_ops);
return 0;
}
static struct platform_driver generic_bL_platdrv = {
.driver = {
.name = "arm-bL-cpufreq-dt",
},
.probe = generic_bL_probe,
.remove = generic_bL_remove,
};
module_platform_driver(generic_bL_platdrv);
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");
MODULE_LICENSE("GPL v2");

20
drivers/cpufreq/intel_pstate.c
View File

@ -386,16 +386,11 @@ static int intel_pstate_get_cppc_guranteed(int cpu)
return cppc_perf.guaranteed_perf;
}
#else
#else /* CONFIG_ACPI_CPPC_LIB */
static void intel_pstate_set_itmt_prio(int cpu)
{
}
static int intel_pstate_get_cppc_guranteed(int cpu)
{
return -ENOTSUPP;
}
#endif
#endif /* CONFIG_ACPI_CPPC_LIB */
static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
{
@ -477,7 +472,7 @@ static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
acpi_processor_unregister_performance(policy->cpu);
}
#else
#else /* CONFIG_ACPI */
static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
{
}
@ -490,7 +485,14 @@ static inline bool intel_pstate_acpi_pm_profile_server(void)
{
return false;
}
#endif
#endif /* CONFIG_ACPI */
#ifndef CONFIG_ACPI_CPPC_LIB
static int intel_pstate_get_cppc_guranteed(int cpu)
{
return -ENOTSUPP;
}
#endif /* CONFIG_ACPI_CPPC_LIB */
static inline void update_turbo_state(void)
{

25
drivers/cpuidle/governors/menu.c
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@ -134,11 +134,6 @@ struct menu_device {
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
static inline int get_loadavg(unsigned long load)
{
return LOAD_INT(load) * 10 + LOAD_FRAC(load) / 10;
}
static inline int which_bucket(unsigned int duration, unsigned long nr_iowaiters)
{
int bucket = 0;
@ -172,18 +167,10 @@ static inline int which_bucket(unsigned int duration, unsigned long nr_iowaiters
* to be, the higher this multiplier, and thus the higher
* the barrier to go to an expensive C state.
*/
static inline int performance_multiplier(unsigned long nr_iowaiters, unsigned long load)
static inline int performance_multiplier(unsigned long nr_iowaiters)
{
int mult = 1;
/* for higher loadavg, we are more reluctant */
mult += 2 * get_loadavg(load);
/* for IO wait tasks (per cpu!) we add 5x each */
mult += 10 * nr_iowaiters;
return mult;
/* for IO wait tasks (per cpu!) we add 10x each */
return 1 + 10 * nr_iowaiters;
}
static DEFINE_PER_CPU(struct menu_device, menu_devices);
@ -301,7 +288,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
int idx;
unsigned int interactivity_req;
unsigned int predicted_us;
unsigned long nr_iowaiters, cpu_load;
unsigned long nr_iowaiters;
ktime_t delta_next;
if (data->needs_update) {
@ -312,7 +299,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
/* determine the expected residency time, round up */
data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length(&delta_next));
get_iowait_load(&nr_iowaiters, &cpu_load);
nr_iowaiters = nr_iowait_cpu(dev->cpu);
data->bucket = which_bucket(data->next_timer_us, nr_iowaiters);
if (unlikely(drv->state_count <= 1 || latency_req == 0) ||
@ -356,7 +343,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* Use the performance multiplier and the user-configurable
* latency_req to determine the maximum exit latency.
*/
interactivity_req = predicted_us / performance_multiplier(nr_iowaiters, cpu_load);
interactivity_req = predicted_us / performance_multiplier(nr_iowaiters);
if (latency_req > interactivity_req)
latency_req = interactivity_req;
}

1
include/linux/sched/stat.h
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@ -20,7 +20,6 @@ extern unsigned long nr_running(void);
extern bool single_task_running(void);
extern unsigned long nr_iowait(void);
extern unsigned long nr_iowait_cpu(int cpu);
extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
static inline int sched_info_on(void)
{

34
kernel/sched/core.c
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@ -2875,6 +2875,18 @@ unsigned long long nr_context_switches(void)
return sum;
}
/*
* Consumers of these two interfaces, like for example the cpuidle menu
* governor, are using nonsensical data. Preferring shallow idle state selection
* for a CPU that has IO-wait which might not even end up running the task when
* it does become runnable.
*/
unsigned long nr_iowait_cpu(int cpu)
{
return atomic_read(&cpu_rq(cpu)->nr_iowait);
}
/*
* IO-wait accounting, and how its mostly bollocks (on SMP).
*
@ -2910,31 +2922,11 @@ unsigned long nr_iowait(void)
unsigned long i, sum = 0;
for_each_possible_cpu(i)
sum += atomic_read(&cpu_rq(i)->nr_iowait);
sum += nr_iowait_cpu(i);
return sum;
}
/*
* Consumers of these two interfaces, like for example the cpuidle menu
* governor, are using nonsensical data. Preferring shallow idle state selection
* for a CPU that has IO-wait which might not even end up running the task when
* it does become runnable.
*/
unsigned long nr_iowait_cpu(int cpu)
{
struct rq *this = cpu_rq(cpu);
return atomic_read(&this->nr_iowait);
}
void get_iowait_load(unsigned long *nr_waiters, unsigned long *load)
{
struct rq *rq = this_rq();
*nr_waiters = atomic_read(&rq->nr_iowait);
*load = rq->load.weight;
}
#ifdef CONFIG_SMP
/*