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s390/idle: consolidate idle functions and definitions

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Move the C functions and definitions related to the idle state handling
to arch/s390/include/asm/idle.h and arch/s390/kernel/idle.c. The function
s390_get_idle_time is renamed to arch_cpu_idle_time and vtime_stop_cpu to
enabled_wait.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-10-01 10:57:57 +02:00
parent fe0f49768d
commit b5f87f15e2
12 changed files with 166 additions and 144 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/s390/include/asm/cputime.h
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@ -8,8 +8,6 @@
#define _S390_CPUTIME_H
#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <asm/div64.h>
@ -165,20 +163,8 @@ static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
return clock;
}
struct s390_idle_data {
unsigned int sequence;
unsigned long long idle_count;
unsigned long long idle_time;
unsigned long long clock_idle_enter;
unsigned long long clock_idle_exit;
unsigned long long timer_idle_enter;
unsigned long long timer_idle_exit;
};
cputime64_t arch_cpu_idle_time(int cpu);
DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
cputime64_t s390_get_idle_time(int cpu);
#define arch_idle_time(cpu) s390_get_idle_time(cpu)
#define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
#endif /* _S390_CPUTIME_H */

26
arch/s390/include/asm/idle.h Normal file
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@ -0,0 +1,26 @@
/*
* Copyright IBM Corp. 2014
*
* Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef _S390_IDLE_H
#define _S390_IDLE_H
#include <linux/types.h>
#include <linux/device.h>
struct s390_idle_data {
unsigned int sequence;
unsigned long long idle_count;
unsigned long long idle_time;
unsigned long long clock_idle_enter;
unsigned long long clock_idle_exit;
unsigned long long timer_idle_enter;
unsigned long long timer_idle_exit;
};
extern struct device_attribute dev_attr_idle_count;
extern struct device_attribute dev_attr_idle_time_us;
#endif /* _S390_IDLE_H */

5
arch/s390/include/asm/processor.h
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@ -290,6 +290,11 @@ static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
#endif
}
/*
* Function to stop a processor until the next interrupt occurs
*/
void enabled_wait(void);
/*
* Function to drop a processor into disabled wait state
*/

2
arch/s390/include/asm/vtimer.h
View File

@ -28,6 +28,4 @@ extern int del_virt_timer(struct vtimer_list *timer);
extern void init_cpu_vtimer(void);
extern void vtime_init(void);
extern void vtime_stop_cpu(void);
#endif /* _ASM_S390_TIMER_H */

2
arch/s390/kernel/Makefile
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@ -28,7 +28,7 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
obj-y := traps.o time.o process.o base.o early.o setup.o vtime.o
obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o

2
arch/s390/kernel/asm-offsets.c
View File

@ -9,7 +9,7 @@
#include <linux/kbuild.h>
#include <linux/kvm_host.h>
#include <linux/sched.h>
#include <asm/cputime.h>
#include <asm/idle.h>
#include <asm/vdso.h>
#include <asm/pgtable.h>

2
arch/s390/kernel/entry.h
View File

@ -4,7 +4,7 @@
#include <linux/types.h>
#include <linux/signal.h>
#include <asm/ptrace.h>
#include <asm/cputime.h>
#include <asm/idle.h>
extern void *restart_stack;
extern unsigned long suspend_zero_pages;

124
arch/s390/kernel/idle.c Normal file
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@ -0,0 +1,124 @@
/*
* Idle functions for s390.
*
* Copyright IBM Corp. 2014
*
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/kprobes.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <asm/cputime.h>
#include <asm/nmi.h>
#include <asm/smp.h>
#include "entry.h"
static DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
void __kprobes enabled_wait(void)
{
struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
unsigned long long idle_time;
unsigned long psw_mask;
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
clear_cpu_flag(CIF_NOHZ_DELAY);
/* Call the assembler magic in entry.S */
psw_idle(idle, psw_mask);
/* Account time spent with enabled wait psw loaded as idle time. */
idle->sequence++;
smp_wmb();
idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
idle->idle_time += idle_time;
idle->idle_count++;
account_idle_time(idle_time);
smp_wmb();
idle->sequence++;
}
static ssize_t show_idle_count(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long idle_count;
unsigned int sequence;
do {
sequence = ACCESS_ONCE(idle->sequence);
idle_count = ACCESS_ONCE(idle->idle_count);
if (ACCESS_ONCE(idle->clock_idle_enter))
idle_count++;
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
return sprintf(buf, "%llu\n", idle_count);
}
DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
static ssize_t show_idle_time(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long now, idle_time, idle_enter, idle_exit;
unsigned int sequence;
do {
now = get_tod_clock();
sequence = ACCESS_ONCE(idle->sequence);
idle_time = ACCESS_ONCE(idle->idle_time);
idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
return sprintf(buf, "%llu\n", idle_time >> 12);
}
DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
cputime64_t arch_cpu_idle_time(int cpu)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
unsigned long long now, idle_enter, idle_exit;
unsigned int sequence;
do {
now = get_tod_clock();
sequence = ACCESS_ONCE(idle->sequence);
idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
}
void arch_cpu_idle_enter(void)
{
local_mcck_disable();
}
void arch_cpu_idle(void)
{
if (!test_cpu_flag(CIF_MCCK_PENDING))
/* Halt the cpu and keep track of cpu time accounting. */
enabled_wait();
local_irq_enable();
}
void arch_cpu_idle_exit(void)
{
local_mcck_enable();
if (test_cpu_flag(CIF_MCCK_PENDING))
s390_handle_mcck();
}
void arch_cpu_idle_dead(void)
{
cpu_die();
}

24
arch/s390/kernel/process.c
View File

@ -61,30 +61,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sf->gprs[8];
}
void arch_cpu_idle(void)
{
local_mcck_disable();
if (test_cpu_flag(CIF_MCCK_PENDING)) {
local_mcck_enable();
local_irq_enable();
return;
}
/* Halt the cpu and keep track of cpu time accounting. */
vtime_stop_cpu();
local_irq_enable();
}
void arch_cpu_idle_exit(void)
{
if (test_cpu_flag(CIF_MCCK_PENDING))
s390_handle_mcck();
}
void arch_cpu_idle_dead(void)
{
cpu_die();
}
extern void __kprobes kernel_thread_starter(void);
/*

39
arch/s390/kernel/smp.c
View File

@ -45,6 +45,7 @@
#include <asm/debug.h>
#include <asm/os_info.h>
#include <asm/sigp.h>
#include <asm/idle.h>
#include "entry.h"
enum {
@ -661,7 +662,7 @@ static void smp_start_secondary(void *cpuvoid)
cpu_init();
preempt_disable();
init_cpu_timer();
init_cpu_vtimer();
vtime_init();
pfault_init();
notify_cpu_starting(smp_processor_id());
set_cpu_online(smp_processor_id(), true);
@ -893,42 +894,6 @@ static struct attribute_group cpu_common_attr_group = {
.attrs = cpu_common_attrs,
};
static ssize_t show_idle_count(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long idle_count;
unsigned int sequence;
do {
sequence = ACCESS_ONCE(idle->sequence);
idle_count = ACCESS_ONCE(idle->idle_count);
if (ACCESS_ONCE(idle->clock_idle_enter))
idle_count++;
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
return sprintf(buf, "%llu\n", idle_count);
}
static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
static ssize_t show_idle_time(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long now, idle_time, idle_enter, idle_exit;
unsigned int sequence;
do {
now = get_tod_clock();
sequence = ACCESS_ONCE(idle->sequence);
idle_time = ACCESS_ONCE(idle->idle_time);
idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
return sprintf(buf, "%llu\n", idle_time >> 12);
}
static DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
static struct attribute *cpu_online_attrs[] = {
&dev_attr_idle_count.attr,
&dev_attr_idle_time_us.attr,

60
arch/s390/kernel/vtime.c
View File

@ -6,27 +6,18 @@
*/
#include <linux/kernel_stat.h>
#include <linux/notifier.h>
#include <linux/kprobes.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/timex.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <asm/irq_regs.h>
#include <asm/cputime.h>
#include <asm/vtimer.h>
#include <asm/vtime.h>
#include <asm/irq.h>
#include "entry.h"
static void virt_timer_expire(void);
DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
static LIST_HEAD(virt_timer_list);
static DEFINE_SPINLOCK(virt_timer_lock);
static atomic64_t virt_timer_current;
@ -152,49 +143,6 @@ void vtime_account_system(struct task_struct *tsk)
__attribute__((alias("vtime_account_irq_enter")));
EXPORT_SYMBOL_GPL(vtime_account_system);
void __kprobes vtime_stop_cpu(void)
{
struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
unsigned long long idle_time;
unsigned long psw_mask;
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
clear_cpu_flag(CIF_NOHZ_DELAY);
/* Call the assembler magic in entry.S */
psw_idle(idle, psw_mask);
/* Account time spent with enabled wait psw loaded as idle time. */
idle->sequence++;
smp_wmb();
idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
idle->idle_time += idle_time;
idle->idle_count++;
account_idle_time(idle_time);
smp_wmb();
idle->sequence++;
}
cputime64_t s390_get_idle_time(int cpu)
{
struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
unsigned long long now, idle_enter, idle_exit;
unsigned int sequence;
do {
now = get_tod_clock();
sequence = ACCESS_ONCE(idle->sequence);
idle_enter = ACCESS_ONCE(idle->clock_idle_enter);
idle_exit = ACCESS_ONCE(idle->clock_idle_exit);
} while ((sequence & 1) || (ACCESS_ONCE(idle->sequence) != sequence));
return idle_enter ? ((idle_exit ?: now) - idle_enter) : 0;
}
/*
* Sorted add to a list. List is linear searched until first bigger
* element is found.
@ -372,14 +320,8 @@ EXPORT_SYMBOL(del_virt_timer);
/*
* Start the virtual CPU timer on the current CPU.
*/
void init_cpu_vtimer(void)
void vtime_init(void)
{
/* set initial cpu timer */
set_vtimer(VTIMER_MAX_SLICE);
}
void __init vtime_init(void)
{
/* Enable cpu timer interrupts on the boot cpu. */
init_cpu_vtimer();
}

4
arch/s390/lib/delay.c
View File

@ -43,7 +43,7 @@ static void __udelay_disabled(unsigned long long usecs)
lockdep_off();
do {
set_clock_comparator(end);
vtime_stop_cpu();
enabled_wait();
} while (get_tod_clock_fast() < end);
lockdep_on();
__ctl_load(cr0, 0, 0);
@ -62,7 +62,7 @@ static void __udelay_enabled(unsigned long long usecs)
clock_saved = local_tick_disable();
set_clock_comparator(end);
}
vtime_stop_cpu();
enabled_wait();
if (clock_saved)
local_tick_enable(clock_saved);
} while (get_tod_clock_fast() < end);