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体验新版 GitCode,发现更多精彩内容 >>
提交
e6f08d37
编写于
12月 16, 2011
作者:
B
Benjamin Herrenschmidt
浏览文件
操作
浏览文件
下载
差异文件
Merge branch 'cpuidle' into next
上级
7c637b04
e8bb3e00
变更
13
隐藏空白更改
内联
并排
Showing
13 changed file
with
411 addition
and
89 deletion
+411
-89
arch/powerpc/Kconfig
arch/powerpc/Kconfig
+4
-0
arch/powerpc/include/asm/processor.h
arch/powerpc/include/asm/processor.h
+3
-0
arch/powerpc/include/asm/system.h
arch/powerpc/include/asm/system.h
+9
-0
arch/powerpc/kernel/idle.c
arch/powerpc/kernel/idle.c
+27
-0
arch/powerpc/kernel/sysfs.c
arch/powerpc/kernel/sysfs.c
+2
-0
arch/powerpc/platforms/Kconfig
arch/powerpc/platforms/Kconfig
+6
-0
arch/powerpc/platforms/pseries/Kconfig
arch/powerpc/platforms/pseries/Kconfig
+9
-0
arch/powerpc/platforms/pseries/Makefile
arch/powerpc/platforms/pseries/Makefile
+1
-0
arch/powerpc/platforms/pseries/processor_idle.c
arch/powerpc/platforms/pseries/processor_idle.c
+329
-0
arch/powerpc/platforms/pseries/pseries.h
arch/powerpc/platforms/pseries/pseries.h
+3
-0
arch/powerpc/platforms/pseries/setup.c
arch/powerpc/platforms/pseries/setup.c
+17
-87
arch/powerpc/platforms/pseries/smp.c
arch/powerpc/platforms/pseries/smp.c
+1
-0
include/linux/cpuidle.h
include/linux/cpuidle.h
+0
-2
未找到文件。
arch/powerpc/Kconfig
浏览文件 @
e6f08d37
...
...
@@ -87,6 +87,10 @@ config ARCH_HAS_ILOG2_U64
bool
default y if 64BIT
config ARCH_HAS_CPU_IDLE_WAIT
bool
default y
config GENERIC_HWEIGHT
bool
default y
...
...
arch/powerpc/include/asm/processor.h
浏览文件 @
e6f08d37
...
...
@@ -382,6 +382,9 @@ static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
}
#endif
extern
unsigned
long
cpuidle_disable
;
enum
idle_boot_override
{
IDLE_NO_OVERRIDE
=
0
,
IDLE_POWERSAVE_OFF
};
#endif
/* __KERNEL__ */
#endif
/* __ASSEMBLY__ */
#endif
/* _ASM_POWERPC_PROCESSOR_H */
arch/powerpc/include/asm/system.h
浏览文件 @
e6f08d37
...
...
@@ -221,6 +221,15 @@ extern unsigned long klimit;
extern
void
*
zalloc_maybe_bootmem
(
size_t
size
,
gfp_t
mask
);
extern
int
powersave_nap
;
/* set if nap mode can be used in idle loop */
void
cpu_idle_wait
(
void
);
#ifdef CONFIG_PSERIES_IDLE
extern
void
update_smt_snooze_delay
(
int
snooze
);
extern
int
pseries_notify_cpuidle_add_cpu
(
int
cpu
);
#else
static
inline
void
update_smt_snooze_delay
(
int
snooze
)
{}
static
inline
int
pseries_notify_cpuidle_add_cpu
(
int
cpu
)
{
return
0
;
}
#endif
/*
* Atomic exchange
...
...
arch/powerpc/kernel/idle.c
浏览文件 @
e6f08d37
...
...
@@ -39,9 +39,13 @@
#define cpu_should_die() 0
#endif
unsigned
long
cpuidle_disable
=
IDLE_NO_OVERRIDE
;
EXPORT_SYMBOL
(
cpuidle_disable
);
static
int
__init
powersave_off
(
char
*
arg
)
{
ppc_md
.
power_save
=
NULL
;
cpuidle_disable
=
IDLE_POWERSAVE_OFF
;
return
0
;
}
__setup
(
"powersave=off"
,
powersave_off
);
...
...
@@ -102,6 +106,29 @@ void cpu_idle(void)
}
}
/*
* cpu_idle_wait - Used to ensure that all the CPUs come out of the old
* idle loop and start using the new idle loop.
* Required while changing idle handler on SMP systems.
* Caller must have changed idle handler to the new value before the call.
* This window may be larger on shared systems.
*/
void
cpu_idle_wait
(
void
)
{
int
cpu
;
smp_mb
();
/* kick all the CPUs so that they exit out of old idle routine */
get_online_cpus
();
for_each_online_cpu
(
cpu
)
{
if
(
cpu
!=
smp_processor_id
())
smp_send_reschedule
(
cpu
);
}
put_online_cpus
();
}
EXPORT_SYMBOL_GPL
(
cpu_idle_wait
);
int
powersave_nap
;
#ifdef CONFIG_SYSCTL
...
...
arch/powerpc/kernel/sysfs.c
浏览文件 @
e6f08d37
...
...
@@ -18,6 +18,7 @@
#include <asm/machdep.h>
#include <asm/smp.h>
#include <asm/pmc.h>
#include <asm/system.h>
#include "cacheinfo.h"
...
...
@@ -51,6 +52,7 @@ static ssize_t store_smt_snooze_delay(struct sys_device *dev,
return
-
EINVAL
;
per_cpu
(
smt_snooze_delay
,
cpu
->
sysdev
.
id
)
=
snooze
;
update_smt_snooze_delay
(
snooze
);
return
count
;
}
...
...
arch/powerpc/platforms/Kconfig
浏览文件 @
e6f08d37
...
...
@@ -211,6 +211,12 @@ config PPC_PASEMI_CPUFREQ
endmenu
menu "CPUIdle driver"
source "drivers/cpuidle/Kconfig"
endmenu
config PPC601_SYNC_FIX
bool "Workarounds for PPC601 bugs"
depends on 6xx && (PPC_PREP || PPC_PMAC)
...
...
arch/powerpc/platforms/pseries/Kconfig
浏览文件 @
e6f08d37
...
...
@@ -120,3 +120,12 @@ config DTL
which are accessible through a debugfs file.
Say N if you are unsure.
config PSERIES_IDLE
tristate "Cpuidle driver for pSeries platforms"
depends on CPU_IDLE
depends on PPC_PSERIES
default y
help
Select this option to enable processor idle state management
through cpuidle subsystem.
arch/powerpc/platforms/pseries/Makefile
浏览文件 @
e6f08d37
...
...
@@ -22,6 +22,7 @@ obj-$(CONFIG_PHYP_DUMP) += phyp_dump.o
obj-$(CONFIG_CMM)
+=
cmm.o
obj-$(CONFIG_DTL)
+=
dtl.o
obj-$(CONFIG_IO_EVENT_IRQ)
+=
io_event_irq.o
obj-$(CONFIG_PSERIES_IDLE)
+=
processor_idle.o
ifeq
($(CONFIG_PPC_PSERIES),y)
obj-$(CONFIG_SUSPEND)
+=
suspend.o
...
...
arch/powerpc/platforms/pseries/processor_idle.c
0 → 100644
浏览文件 @
e6f08d37
/*
* processor_idle - idle state cpuidle driver.
* Adapted from drivers/idle/intel_idle.c and
* drivers/acpi/processor_idle.c
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/cpuidle.h>
#include <linux/cpu.h>
#include <asm/paca.h>
#include <asm/reg.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
#include "plpar_wrappers.h"
#include "pseries.h"
struct
cpuidle_driver
pseries_idle_driver
=
{
.
name
=
"pseries_idle"
,
.
owner
=
THIS_MODULE
,
};
#define MAX_IDLE_STATE_COUNT 2
static
int
max_idle_state
=
MAX_IDLE_STATE_COUNT
-
1
;
static
struct
cpuidle_device
__percpu
*
pseries_cpuidle_devices
;
static
struct
cpuidle_state
*
cpuidle_state_table
;
void
update_smt_snooze_delay
(
int
snooze
)
{
struct
cpuidle_driver
*
drv
=
cpuidle_get_driver
();
if
(
drv
)
drv
->
states
[
0
].
target_residency
=
snooze
;
}
static
inline
void
idle_loop_prolog
(
unsigned
long
*
in_purr
,
ktime_t
*
kt_before
)
{
*
kt_before
=
ktime_get_real
();
*
in_purr
=
mfspr
(
SPRN_PURR
);
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca
()
->
idle
=
1
;
}
static
inline
s64
idle_loop_epilog
(
unsigned
long
in_purr
,
ktime_t
kt_before
)
{
get_lppaca
()
->
wait_state_cycles
+=
mfspr
(
SPRN_PURR
)
-
in_purr
;
get_lppaca
()
->
idle
=
0
;
return
ktime_to_us
(
ktime_sub
(
ktime_get_real
(),
kt_before
));
}
static
int
snooze_loop
(
struct
cpuidle_device
*
dev
,
struct
cpuidle_driver
*
drv
,
int
index
)
{
unsigned
long
in_purr
;
ktime_t
kt_before
;
unsigned
long
start_snooze
;
long
snooze
=
drv
->
states
[
0
].
target_residency
;
idle_loop_prolog
(
&
in_purr
,
&
kt_before
);
if
(
snooze
)
{
start_snooze
=
get_tb
()
+
snooze
*
tb_ticks_per_usec
;
local_irq_enable
();
set_thread_flag
(
TIF_POLLING_NRFLAG
);
while
((
snooze
<
0
)
||
(
get_tb
()
<
start_snooze
))
{
if
(
need_resched
()
||
cpu_is_offline
(
dev
->
cpu
))
goto
out
;
ppc64_runlatch_off
();
HMT_low
();
HMT_very_low
();
}
HMT_medium
();
clear_thread_flag
(
TIF_POLLING_NRFLAG
);
smp_mb
();
local_irq_disable
();
}
out:
HMT_medium
();
dev
->
last_residency
=
(
int
)
idle_loop_epilog
(
in_purr
,
kt_before
);
return
index
;
}
static
int
dedicated_cede_loop
(
struct
cpuidle_device
*
dev
,
struct
cpuidle_driver
*
drv
,
int
index
)
{
unsigned
long
in_purr
;
ktime_t
kt_before
;
idle_loop_prolog
(
&
in_purr
,
&
kt_before
);
get_lppaca
()
->
donate_dedicated_cpu
=
1
;
ppc64_runlatch_off
();
HMT_medium
();
cede_processor
();
get_lppaca
()
->
donate_dedicated_cpu
=
0
;
dev
->
last_residency
=
(
int
)
idle_loop_epilog
(
in_purr
,
kt_before
);
return
index
;
}
static
int
shared_cede_loop
(
struct
cpuidle_device
*
dev
,
struct
cpuidle_driver
*
drv
,
int
index
)
{
unsigned
long
in_purr
;
ktime_t
kt_before
;
idle_loop_prolog
(
&
in_purr
,
&
kt_before
);
/*
* Yield the processor to the hypervisor. We return if
* an external interrupt occurs (which are driven prior
* to returning here) or if a prod occurs from another
* processor. When returning here, external interrupts
* are enabled.
*/
cede_processor
();
dev
->
last_residency
=
(
int
)
idle_loop_epilog
(
in_purr
,
kt_before
);
return
index
;
}
/*
* States for dedicated partition case.
*/
static
struct
cpuidle_state
dedicated_states
[
MAX_IDLE_STATE_COUNT
]
=
{
{
/* Snooze */
.
name
=
"snooze"
,
.
desc
=
"snooze"
,
.
flags
=
CPUIDLE_FLAG_TIME_VALID
,
.
exit_latency
=
0
,
.
target_residency
=
0
,
.
enter
=
&
snooze_loop
},
{
/* CEDE */
.
name
=
"CEDE"
,
.
desc
=
"CEDE"
,
.
flags
=
CPUIDLE_FLAG_TIME_VALID
,
.
exit_latency
=
1
,
.
target_residency
=
10
,
.
enter
=
&
dedicated_cede_loop
},
};
/*
* States for shared partition case.
*/
static
struct
cpuidle_state
shared_states
[
MAX_IDLE_STATE_COUNT
]
=
{
{
/* Shared Cede */
.
name
=
"Shared Cede"
,
.
desc
=
"Shared Cede"
,
.
flags
=
CPUIDLE_FLAG_TIME_VALID
,
.
exit_latency
=
0
,
.
target_residency
=
0
,
.
enter
=
&
shared_cede_loop
},
};
int
pseries_notify_cpuidle_add_cpu
(
int
cpu
)
{
struct
cpuidle_device
*
dev
=
per_cpu_ptr
(
pseries_cpuidle_devices
,
cpu
);
if
(
dev
&&
cpuidle_get_driver
())
{
cpuidle_disable_device
(
dev
);
cpuidle_enable_device
(
dev
);
}
return
0
;
}
/*
* pseries_cpuidle_driver_init()
*/
static
int
pseries_cpuidle_driver_init
(
void
)
{
int
idle_state
;
struct
cpuidle_driver
*
drv
=
&
pseries_idle_driver
;
drv
->
state_count
=
0
;
for
(
idle_state
=
0
;
idle_state
<
MAX_IDLE_STATE_COUNT
;
++
idle_state
)
{
if
(
idle_state
>
max_idle_state
)
break
;
/* is the state not enabled? */
if
(
cpuidle_state_table
[
idle_state
].
enter
==
NULL
)
continue
;
drv
->
states
[
drv
->
state_count
]
=
/* structure copy */
cpuidle_state_table
[
idle_state
];
if
(
cpuidle_state_table
==
dedicated_states
)
drv
->
states
[
drv
->
state_count
].
target_residency
=
__get_cpu_var
(
smt_snooze_delay
);
drv
->
state_count
+=
1
;
}
return
0
;
}
/* pseries_idle_devices_uninit(void)
* unregister cpuidle devices and de-allocate memory
*/
static
void
pseries_idle_devices_uninit
(
void
)
{
int
i
;
struct
cpuidle_device
*
dev
;
for_each_possible_cpu
(
i
)
{
dev
=
per_cpu_ptr
(
pseries_cpuidle_devices
,
i
);
cpuidle_unregister_device
(
dev
);
}
free_percpu
(
pseries_cpuidle_devices
);
return
;
}
/* pseries_idle_devices_init()
* allocate, initialize and register cpuidle device
*/
static
int
pseries_idle_devices_init
(
void
)
{
int
i
;
struct
cpuidle_driver
*
drv
=
&
pseries_idle_driver
;
struct
cpuidle_device
*
dev
;
pseries_cpuidle_devices
=
alloc_percpu
(
struct
cpuidle_device
);
if
(
pseries_cpuidle_devices
==
NULL
)
return
-
ENOMEM
;
for_each_possible_cpu
(
i
)
{
dev
=
per_cpu_ptr
(
pseries_cpuidle_devices
,
i
);
dev
->
state_count
=
drv
->
state_count
;
dev
->
cpu
=
i
;
if
(
cpuidle_register_device
(
dev
))
{
printk
(
KERN_DEBUG
\
"cpuidle_register_device %d failed!
\n
"
,
i
);
return
-
EIO
;
}
}
return
0
;
}
/*
* pseries_idle_probe()
* Choose state table for shared versus dedicated partition
*/
static
int
pseries_idle_probe
(
void
)
{
if
(
!
firmware_has_feature
(
FW_FEATURE_SPLPAR
))
return
-
ENODEV
;
if
(
cpuidle_disable
!=
IDLE_NO_OVERRIDE
)
return
-
ENODEV
;
if
(
max_idle_state
==
0
)
{
printk
(
KERN_DEBUG
"pseries processor idle disabled.
\n
"
);
return
-
EPERM
;
}
if
(
get_lppaca
()
->
shared_proc
)
cpuidle_state_table
=
shared_states
;
else
cpuidle_state_table
=
dedicated_states
;
return
0
;
}
static
int
__init
pseries_processor_idle_init
(
void
)
{
int
retval
;
retval
=
pseries_idle_probe
();
if
(
retval
)
return
retval
;
pseries_cpuidle_driver_init
();
retval
=
cpuidle_register_driver
(
&
pseries_idle_driver
);
if
(
retval
)
{
printk
(
KERN_DEBUG
"Registration of pseries driver failed.
\n
"
);
return
retval
;
}
retval
=
pseries_idle_devices_init
();
if
(
retval
)
{
pseries_idle_devices_uninit
();
cpuidle_unregister_driver
(
&
pseries_idle_driver
);
return
retval
;
}
printk
(
KERN_DEBUG
"pseries_idle_driver registered
\n
"
);
return
0
;
}
static
void
__exit
pseries_processor_idle_exit
(
void
)
{
pseries_idle_devices_uninit
();
cpuidle_unregister_driver
(
&
pseries_idle_driver
);
return
;
}
module_init
(
pseries_processor_idle_init
);
module_exit
(
pseries_processor_idle_exit
);
MODULE_AUTHOR
(
"Deepthi Dharwar <deepthi@linux.vnet.ibm.com>"
);
MODULE_DESCRIPTION
(
"Cpuidle driver for POWER"
);
MODULE_LICENSE
(
"GPL"
);
arch/powerpc/platforms/pseries/pseries.h
浏览文件 @
e6f08d37
...
...
@@ -57,4 +57,7 @@ extern struct device_node *dlpar_configure_connector(u32);
extern
int
dlpar_attach_node
(
struct
device_node
*
);
extern
int
dlpar_detach_node
(
struct
device_node
*
);
/* Snooze Delay, pseries_idle */
DECLARE_PER_CPU
(
long
,
smt_snooze_delay
);
#endif
/* _PSERIES_PSERIES_H */
arch/powerpc/platforms/pseries/setup.c
浏览文件 @
e6f08d37
...
...
@@ -39,6 +39,7 @@
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpuidle.h>
#include <asm/mmu.h>
#include <asm/processor.h>
...
...
@@ -74,9 +75,6 @@ EXPORT_SYMBOL(CMO_PageSize);
int
fwnmi_active
;
/* TRUE if an FWNMI handler is present */
static
void
pseries_shared_idle_sleep
(
void
);
static
void
pseries_dedicated_idle_sleep
(
void
);
static
struct
device_node
*
pSeries_mpic_node
;
static
void
pSeries_show_cpuinfo
(
struct
seq_file
*
m
)
...
...
@@ -351,6 +349,21 @@ static int alloc_dispatch_log_kmem_cache(void)
}
early_initcall
(
alloc_dispatch_log_kmem_cache
);
static
void
pSeries_idle
(
void
)
{
/* This would call on the cpuidle framework, and the back-end pseries
* driver to go to idle states
*/
if
(
cpuidle_idle_call
())
{
/* On error, execute default handler
* to go into low thread priority and possibly
* low power mode.
*/
HMT_low
();
HMT_very_low
();
}
}
static
void
__init
pSeries_setup_arch
(
void
)
{
/* Discover PIC type and setup ppc_md accordingly */
...
...
@@ -373,18 +386,9 @@ static void __init pSeries_setup_arch(void)
pSeries_nvram_init
();
/* Choose an idle loop */
if
(
firmware_has_feature
(
FW_FEATURE_SPLPAR
))
{
vpa_init
(
boot_cpuid
);
if
(
get_lppaca
()
->
shared_proc
)
{
printk
(
KERN_DEBUG
"Using shared processor idle loop
\n
"
);
ppc_md
.
power_save
=
pseries_shared_idle_sleep
;
}
else
{
printk
(
KERN_DEBUG
"Using dedicated idle loop
\n
"
);
ppc_md
.
power_save
=
pseries_dedicated_idle_sleep
;
}
}
else
{
printk
(
KERN_DEBUG
"Using default idle loop
\n
"
);
ppc_md
.
power_save
=
pSeries_idle
;
}
if
(
firmware_has_feature
(
FW_FEATURE_LPAR
))
...
...
@@ -585,80 +589,6 @@ static int __init pSeries_probe(void)
return
1
;
}
DECLARE_PER_CPU
(
long
,
smt_snooze_delay
);
static
void
pseries_dedicated_idle_sleep
(
void
)
{
unsigned
int
cpu
=
smp_processor_id
();
unsigned
long
start_snooze
;
unsigned
long
in_purr
,
out_purr
;
long
snooze
=
__get_cpu_var
(
smt_snooze_delay
);
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca
()
->
idle
=
1
;
get_lppaca
()
->
donate_dedicated_cpu
=
1
;
in_purr
=
mfspr
(
SPRN_PURR
);
/*
* We come in with interrupts disabled, and need_resched()
* has been checked recently. If we should poll for a little
* while, do so.
*/
if
(
snooze
)
{
start_snooze
=
get_tb
()
+
snooze
*
tb_ticks_per_usec
;
local_irq_enable
();
set_thread_flag
(
TIF_POLLING_NRFLAG
);
while
((
snooze
<
0
)
||
(
get_tb
()
<
start_snooze
))
{
if
(
need_resched
()
||
cpu_is_offline
(
cpu
))
goto
out
;
ppc64_runlatch_off
();
HMT_low
();
HMT_very_low
();
}
HMT_medium
();
clear_thread_flag
(
TIF_POLLING_NRFLAG
);
smp_mb
();
local_irq_disable
();
if
(
need_resched
()
||
cpu_is_offline
(
cpu
))
goto
out
;
}
cede_processor
();
out:
HMT_medium
();
out_purr
=
mfspr
(
SPRN_PURR
);
get_lppaca
()
->
wait_state_cycles
+=
out_purr
-
in_purr
;
get_lppaca
()
->
donate_dedicated_cpu
=
0
;
get_lppaca
()
->
idle
=
0
;
}
static
void
pseries_shared_idle_sleep
(
void
)
{
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca
()
->
idle
=
1
;
/*
* Yield the processor to the hypervisor. We return if
* an external interrupt occurs (which are driven prior
* to returning here) or if a prod occurs from another
* processor. When returning here, external interrupts
* are enabled.
*/
cede_processor
();
get_lppaca
()
->
idle
=
0
;
}
static
int
pSeries_pci_probe_mode
(
struct
pci_bus
*
bus
)
{
if
(
firmware_has_feature
(
FW_FEATURE_LPAR
))
...
...
arch/powerpc/platforms/pseries/smp.c
浏览文件 @
e6f08d37
...
...
@@ -148,6 +148,7 @@ static void __devinit smp_xics_setup_cpu(int cpu)
set_cpu_current_state
(
cpu
,
CPU_STATE_ONLINE
);
set_default_offline_state
(
cpu
);
#endif
pseries_notify_cpuidle_add_cpu
(
cpu
);
}
static
int
__devinit
smp_pSeries_kick_cpu
(
int
nr
)
...
...
include/linux/cpuidle.h
浏览文件 @
e6f08d37
...
...
@@ -130,7 +130,6 @@ struct cpuidle_driver {
#ifdef CONFIG_CPU_IDLE
extern
void
disable_cpuidle
(
void
);
extern
int
cpuidle_idle_call
(
void
);
extern
int
cpuidle_register_driver
(
struct
cpuidle_driver
*
drv
);
struct
cpuidle_driver
*
cpuidle_get_driver
(
void
);
extern
void
cpuidle_unregister_driver
(
struct
cpuidle_driver
*
drv
);
...
...
@@ -145,7 +144,6 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev);
#else
static
inline
void
disable_cpuidle
(
void
)
{
}
static
inline
int
cpuidle_idle_call
(
void
)
{
return
-
ENODEV
;
}
static
inline
int
cpuidle_register_driver
(
struct
cpuidle_driver
*
drv
)
{
return
-
ENODEV
;
}
static
inline
struct
cpuidle_driver
*
cpuidle_get_driver
(
void
)
{
return
NULL
;
}
...
...
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