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arm: Use generic idle loop

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Use the generic idle loop and replace enable/disable_hlt with the
respective core functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Tested-by: Kevin Hilman <khilman@linaro.org> # OMAP
Link: http://lkml.kernel.org/r/20130321215233.826238797@linutronix.de
This commit is contained in:
Thomas Gleixner 2013-03-21 22:49:38 +01:00
parent a123322d8a
commit f7b861b7a6
15 changed files with 58 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig
View File

@ -15,6 +15,8 @@ config ARM
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SMP_IDLE_THREAD
select GENERIC_IDLE_LOOP
select GENERIC_IDLE_POLL_SETUP
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HARDIRQS_SW_RESEND

3
arch/arm/include/asm/system_misc.h
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@ -21,9 +21,6 @@ extern void (*arm_pm_idle)(void);
extern unsigned int user_debug;
extern void disable_hlt(void);
extern void enable_hlt(void);
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_ARM_SYSTEM_MISC_H */

90
arch/arm/kernel/process.c
View File

@ -57,34 +57,6 @@ static const char *isa_modes[] = {
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
};
static volatile int hlt_counter;
void disable_hlt(void)
{
hlt_counter++;
}
void enable_hlt(void)
{
hlt_counter--;
BUG_ON(hlt_counter < 0);
}
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("nohlt", nohlt_setup);
__setup("hlt", hlt_setup);
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
typedef void (*phys_reset_t)(unsigned long);
@ -168,54 +140,38 @@ static void default_idle(void)
local_irq_enable();
}
/*
* The idle thread.
* We always respect 'hlt_counter' to prevent low power idle.
*/
void cpu_idle(void)
void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
}
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
void arch_cpu_idle_enter(void)
{
ledtrig_cpu(CPU_LED_IDLE_START);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
/*
* We need to disable interrupts here
* to ensure we don't miss a wakeup call.
*/
local_irq_disable();
#ifdef CONFIG_PL310_ERRATA_769419
wmb();
#endif
if (hlt_counter) {
local_irq_enable();
cpu_relax();
} else if (!need_resched()) {
stop_critical_timings();
}
void arch_cpu_idle_exit(void)
{
ledtrig_cpu(CPU_LED_IDLE_END);
}
#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
cpu_die();
}
#endif
/*
* Called from the core idle loop.
*/
void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
default_idle();
start_critical_timings();
/*
* default_idle functions must always
* return with IRQs enabled.
*/
WARN_ON(irqs_disabled());
} else
local_irq_enable();
}
ledtrig_cpu(CPU_LED_IDLE_END);
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
static char reboot_mode = 'h';

2
arch/arm/kernel/smp.c
View File

@ -336,7 +336,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)

4
arch/arm/mach-gemini/idle.c
View File

@ -13,9 +13,11 @@ static void gemini_idle(void)
* will never wakeup... Acctualy it is not very good to enable
* interrupts first since scheduler can miss a tick, but there is
* no other way around this. Platforms that needs it for power saving
* should call enable_hlt() in init code, since by default it is
* should enable it in init code, since by default it is
* disabled.
*/
/* FIXME: Enabling interrupts here is racy! */
local_irq_enable();
cpu_do_idle();
}

4
arch/arm/mach-gemini/irq.c
View File

@ -15,6 +15,8 @@
#include <linux/stddef.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/cpu.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/system_misc.h>
@ -77,7 +79,7 @@ void __init gemini_init_irq(void)
* Disable the idle handler by default since it is buggy
* For more info see arch/arm/mach-gemini/idle.c
*/
disable_hlt();
cpu_idle_poll_ctrl(true);
request_resource(&iomem_resource, &irq_resource);

3
arch/arm/mach-ixp4xx/common.c
View File

@ -29,6 +29,7 @@
#include <linux/io.h>
#include <linux/export.h>
#include <linux/gpio.h>
#include <linux/cpu.h>
#include <mach/udc.h>
#include <mach/hardware.h>
@ -239,7 +240,7 @@ void __init ixp4xx_init_irq(void)
* ixp4xx does not implement the XScale PWRMODE register
* so it must not call cpu_do_idle().
*/
disable_hlt();
cpu_idle_poll_ctrl(true);
/* Route all sources to IRQ instead of FIQ */
*IXP4XX_ICLR = 0x0;

6
arch/arm/mach-omap1/pm.c
View File

@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/io.h>
#include <linux/atomic.h>
#include <linux/cpu.h>
#include <asm/fncpy.h>
#include <asm/system_misc.h>
@ -584,8 +585,7 @@ static void omap_pm_init_proc(void)
static int omap_pm_prepare(void)
{
/* We cannot sleep in idle until we have resumed */
disable_hlt();
cpu_idle_poll_ctrl(true);
return 0;
}
@ -621,7 +621,7 @@ static int omap_pm_enter(suspend_state_t state)
static void omap_pm_finish(void)
{
enable_hlt();
cpu_idle_poll_ctrl(false);
}

7
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -138,6 +138,7 @@
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/cpu.h>
#include <asm/system_misc.h>
@ -2157,7 +2158,7 @@ static int _enable(struct omap_hwmod *oh)
if (soc_ops.enable_module)
soc_ops.enable_module(oh);
if (oh->flags & HWMOD_BLOCK_WFI)
disable_hlt();
cpu_idle_poll_ctrl(true);
if (soc_ops.update_context_lost)
soc_ops.update_context_lost(oh);
@ -2221,7 +2222,7 @@ static int _idle(struct omap_hwmod *oh)
_del_initiator_dep(oh, mpu_oh);
if (oh->flags & HWMOD_BLOCK_WFI)
enable_hlt();
cpu_idle_poll_ctrl(false);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
@ -2331,7 +2332,7 @@ static int _shutdown(struct omap_hwmod *oh)
_del_initiator_dep(oh, mpu_oh);
/* XXX what about the other system initiators here? dma, dsp */
if (oh->flags & HWMOD_BLOCK_WFI)
enable_hlt();
cpu_idle_poll_ctrl(false);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);

5
arch/arm/mach-omap2/pm.c
View File

@ -218,7 +218,7 @@ static int omap_pm_enter(suspend_state_t suspend_state)
static int omap_pm_begin(suspend_state_t state)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
if (cpu_is_omap34xx())
omap_prcm_irq_prepare();
return 0;
@ -226,8 +226,7 @@ static int omap_pm_begin(suspend_state_t state)
static void omap_pm_end(void)
{
enable_hlt();
return;
cpu_idle_poll_ctrl(false);
}
static void omap_pm_finish(void)

3
arch/arm/mach-orion5x/board-dt.c
View File

@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/cpu.h>
#include <asm/system_misc.h>
#include <asm/mach/arch.h>
#include <mach/orion5x.h>
@ -52,7 +53,7 @@ static void __init orion5x_dt_init(void)
*/
if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
disable_hlt();
cpu_idle_poll_ctrl(true);
}
if (of_machine_is_compatible("lacie,ethernet-disk-mini-v2"))

2
arch/arm/mach-orion5x/common.c
View File

@ -293,7 +293,7 @@ void __init orion5x_init(void)
*/
if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
disable_hlt();
cpu_idle_poll_ctrl(true);
}
/*

3
arch/arm/mach-shark/core.c
View File

@ -10,6 +10,7 @@
#include <linux/sched.h>
#include <linux/serial_8250.h>
#include <linux/io.h>
#include <linux/cpu.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@ -130,7 +131,7 @@ static void __init shark_timer_init(void)
static void shark_init_early(void)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
}
MACHINE_START(SHARK, "Shark")

6
arch/arm/mach-shmobile/suspend.c
View File

@ -12,6 +12,8 @@
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/cpu.h>
#include <asm/io.h>
#include <asm/system_misc.h>
@ -23,13 +25,13 @@ static int shmobile_suspend_default_enter(suspend_state_t suspend_state)
static int shmobile_suspend_begin(suspend_state_t state)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
return 0;
}
static void shmobile_suspend_end(void)
{
enable_hlt();
cpu_idle_poll_ctrl(false);
}
struct platform_suspend_ops shmobile_suspend_ops = {

3
arch/arm/mach-w90x900/dev.c
View File

@ -19,6 +19,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/mtd.h>
@ -531,7 +532,7 @@ static struct platform_device *nuc900_public_dev[] __initdata = {
void __init nuc900_board_init(struct platform_device **device, int size)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
platform_add_devices(device, size);
platform_add_devices(nuc900_public_dev, ARRAY_SIZE(nuc900_public_dev));
spi_register_board_info(nuc900_spi_board_info,