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nexedi
linux
Commits
0e67de54
Commit
0e67de54
authored
Nov 08, 2002
by
Paul Mackerras
Browse files
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PPC32: make the idle loop able to be platform-specific.
parent
1decdfc7
Changes
7
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Showing
7 changed files
with
231 additions
and
154 deletions
+231
-154
arch/ppc/kernel/Makefile
arch/ppc/kernel/Makefile
+2
-2
arch/ppc/kernel/iSeries_idle.c
arch/ppc/kernel/iSeries_idle.c
+124
-0
arch/ppc/kernel/idle.c
arch/ppc/kernel/idle.c
+17
-152
arch/ppc/kernel/ppc6xx_idle.c
arch/ppc/kernel/ppc6xx_idle.c
+76
-0
arch/ppc/kernel/setup.c
arch/ppc/kernel/setup.c
+6
-0
arch/ppc/platforms/iSeries_setup.c
arch/ppc/platforms/iSeries_setup.c
+3
-0
include/asm-ppc/machdep.h
include/asm-ppc/machdep.h
+3
-0
No files found.
arch/ppc/kernel/Makefile
View file @
0e67de54
...
...
@@ -23,13 +23,13 @@ obj-y := entry.o traps.o irq.o idle.o time.o misc.o \
process.o signal.o ptrace.o align.o
\
semaphore.o syscalls.o setup.o
\
cputable.o ppc_htab.o
obj-$(CONFIG_6xx)
+=
l2cr.o
obj-$(CONFIG_6xx)
+=
l2cr.o ppc6xx_idle.o
obj-$(CONFIG_ALL_PPC)
+=
ppc6xx_idle.o
obj-$(CONFIG_MODULES)
+=
ppc_ksyms.o
obj-$(CONFIG_PCI)
+=
pci.o
ifneq
($(CONFIG_PPC_ISERIES),y)
obj-$(CONFIG_PCI)
+=
pci-dma.o
endif
obj-$(CONFIG_PPCBUG_NVRAM)
+=
prep_nvram.o
obj-$(CONFIG_KGDB)
+=
ppc-stub.o
obj-$(CONFIG_SMP)
+=
smp.o
obj-$(CONFIG_TAU)
+=
temp.o
...
...
arch/ppc/kernel/iSeries_idle.c
0 → 100644
View file @
0e67de54
/*
* BK Id: %F% %I% %G% %U% %#%
*/
/*
* Idle task for iSeries.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/cache.h>
#include <asm/cputable.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/iSeries/LparData.h>
#include <asm/iSeries/HvCall.h>
#include <asm/hardirq.h>
static
void
yield_shared_processor
(
void
);
static
void
run_light_on
(
int
on
);
extern
unsigned
long
yield_count
;
void
iSeries_idle
(
void
)
{
if
(
!
need_resched
())
{
/* Turn off the run light */
run_light_on
(
0
);
yield_shared_processor
();
HMT_low
();
#ifdef CONFIG_SMP
set_thread_flag
(
TIF_POLLING_NRFLAG
);
while
(
!
need_resched
())
barrier
();
clear_thread_flag
(
TIF_POLLING_NRFLAG
);
#endif
}
if
(
need_resched
())
{
run_light_on
(
1
);
schedule
();
return
;
}
}
extern
void
fake_interrupt
(
void
);
extern
u64
get_tb64
(
void
);
static
void
run_light_on
(
int
on
)
{
unsigned
long
CTRL
;
CTRL
=
mfspr
(
CTRLF
);
CTRL
=
on
?
(
CTRL
|
RUNLATCH
)
:
(
CTRL
&
~
RUNLATCH
);
mtspr
(
CTRLT
,
CTRL
);
}
static
void
yield_shared_processor
(
void
)
{
struct
Paca
*
paca
;
u64
tb
;
/* Poll for I/O events */
local_irq_disable
();
local_irq_enable
();
paca
=
(
struct
Paca
*
)
mfspr
(
SPRG1
);
if
(
paca
->
xLpPaca
.
xSharedProc
)
{
HvCall_setEnabledInterrupts
(
HvCall_MaskIPI
|
HvCall_MaskLpEvent
|
HvCall_MaskLpProd
|
HvCall_MaskTimeout
);
/*
* Check here for any of the above pending...
* IPI and Decrementers are indicated in ItLpPaca
* LpEvents are indicated on the LpQueue
*
* Disabling/enabling will check for LpEvents, IPIs
* and decrementers
*/
local_irq_disable
();
local_irq_enable
();
++
yield_count
;
/* Get current tb value */
tb
=
get_tb64
();
/* Compute future tb value when yield will expire */
tb
+=
tb_ticks_per_jiffy
;
HvCall_yieldProcessor
(
HvCall_YieldTimed
,
tb
);
/* Check here for any of the above pending or timeout expired*/
local_irq_disable
();
/*
* The decrementer stops during the yield. Just force
* a fake decrementer now and the timer_interrupt
* code will straighten it all out
*/
paca
->
xLpPaca
.
xDecrInt
=
1
;
local_irq_enable
();
}
}
arch/ppc/kernel/idle.c
View file @
0e67de54
...
...
@@ -2,7 +2,8 @@
* Idle daemon for PowerPC. Idle daemon will handle any action
* that needs to be taken when the system becomes idle.
*
* Written by Cort Dougan (cort@cs.nmt.edu)
* Written by Cort Dougan (cort@cs.nmt.edu). Subsequently hacked
* on by Tom Rini, Armin Kuster, Paul Mackerras and others.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
...
...
@@ -29,175 +30,39 @@
#include <asm/mmu.h>
#include <asm/cache.h>
#include <asm/cputable.h>
#ifdef CONFIG_PPC_ISERIES
#include <asm/time.h>
#include <asm/iSeries/LparData.h>
#include <asm/iSeries/HvCall.h>
#include <asm/hardirq.h>
static
void
yield_shared_processor
(
void
);
static
void
run_light_on
(
int
on
);
extern
unsigned
long
yield_count
;
#else
/* CONFIG_PPC_ISERIES */
#define run_light_on(x) do { } while (0)
#endif
/* CONFIG_PPC_ISERIES */
void
power_save
(
void
);
unsigned
long
zero_paged_on
;
unsigned
long
powersave_nap
;
#include <asm/machdep.h>
void
default_idle
(
void
)
{
int
do_power_save
=
0
;
void
(
*
powersave
)(
void
)
;
/* Check if CPU can powersave */
if
(
cur_cpu_spec
[
smp_processor_id
()]
->
cpu_features
&
(
CPU_FTR_CAN_DOZE
|
CPU_FTR_CAN_NAP
))
do_power_save
=
1
;
powersave
=
ppc_md
.
power_save
;
#ifdef CONFIG_PPC_ISERIES
if
(
!
current
->
need_resched
)
{
/* Turn off the run light */
run_light_on
(
0
);
yield_shared_processor
();
}
HMT_low
();
#endif
if
(
!
need_resched
())
{
if
(
powersave
!=
NULL
)
powersave
();
#ifdef CONFIG_SMP
if
(
!
do_power_save
)
{
if
(
!
need_resched
())
{
else
{
set_thread_flag
(
TIF_POLLING_NRFLAG
);
while
(
!
test_thread_flag
(
TIF_NEED_RESCHED
))
while
(
!
need_resched
(
))
barrier
();
clear_thread_flag
(
TIF_POLLING_NRFLAG
);
}
}
#endif
if
(
do_power_save
&&
!
need_resched
())
power_save
();
if
(
need_resched
())
{
run_light_on
(
1
);
schedule
();
}
#ifdef CONFIG_PPC_ISERIES
else
{
run_light_on
(
0
);
yield_shared_processor
();
HMT_low
();
}
#endif
/* CONFIG_PPC_ISERIES */
if
(
need_resched
())
schedule
();
}
/*
* SMP entry into the idle task - calls the same thing as the
* non-smp versions. -- Cort
* The body of the idle task.
*/
int
cpu_idle
(
void
)
{
for
(;;)
default_idle
();
if
(
ppc_md
.
idle
!=
NULL
)
ppc_md
.
idle
();
else
default_idle
();
return
0
;
}
void
power_save
(
void
)
{
unsigned
long
hid0
;
int
nap
=
powersave_nap
;
/* 7450 has no DOZE mode mode, we return if powersave_nap
* isn't enabled
*/
if
(
!
(
nap
||
(
cur_cpu_spec
[
smp_processor_id
()]
->
cpu_features
&
CPU_FTR_CAN_DOZE
)))
return
;
/*
* Disable interrupts to prevent a lost wakeup
* when going to sleep. This is necessary even with
* RTLinux since we are not guaranteed an interrupt
* didn't come in and is waiting for a local_irq_enable() before
* emulating one. This way, we really do hard disable.
*
* We assume that we're sti-ed when we come in here. We
* are in the idle loop so if we're cli-ed then it's a bug
* anyway.
* -- Cort
*/
_nmask_and_or_msr
(
MSR_EE
,
0
);
if
(
!
need_resched
())
{
asm
(
"mfspr %0,1008"
:
"=r"
(
hid0
)
:
);
hid0
&=
~
(
HID0_NAP
|
HID0_SLEEP
|
HID0_DOZE
);
hid0
|=
(
powersave_nap
?
HID0_NAP
:
HID0_DOZE
)
|
HID0_DPM
;
asm
(
"mtspr 1008,%0"
:
:
"r"
(
hid0
));
/* set the POW bit in the MSR, and enable interrupts
* so we wake up sometime! */
_nmask_and_or_msr
(
0
,
MSR_POW
|
MSR_EE
);
}
_nmask_and_or_msr
(
0
,
MSR_EE
);
}
#ifdef CONFIG_PPC_ISERIES
extern
void
fake_interrupt
(
void
);
extern
u64
get_tb64
(
void
);
void
run_light_on
(
int
on
)
{
unsigned
long
CTRL
;
CTRL
=
mfspr
(
CTRLF
);
CTRL
=
on
?
(
CTRL
|
RUNLATCH
)
:
(
CTRL
&
~
RUNLATCH
);
mtspr
(
CTRLT
,
CTRL
);
}
void
yield_shared_processor
(
void
)
{
struct
Paca
*
paca
;
u64
tb
;
/* Poll for I/O events */
local_irq_disable
();
local_irq_enable
();
paca
=
(
struct
Paca
*
)
mfspr
(
SPRG1
);
if
(
paca
->
xLpPaca
.
xSharedProc
)
{
HvCall_setEnabledInterrupts
(
HvCall_MaskIPI
|
HvCall_MaskLpEvent
|
HvCall_MaskLpProd
|
HvCall_MaskTimeout
);
/*
* Check here for any of the above pending...
* IPI and Decrementers are indicated in ItLpPaca
* LpEvents are indicated on the LpQueue
*
* Disabling/enabling will check for LpEvents, IPIs
* and decrementers
*/
local_irq_disable
();
local_irq_enable
();
++
yield_count
;
/* Get current tb value */
tb
=
get_tb64
();
/* Compute future tb value when yield will expire */
tb
+=
tb_ticks_per_jiffy
;
HvCall_yieldProcessor
(
HvCall_YieldTimed
,
tb
);
/* Check here for any of the above pending or timeout expired*/
local_irq_disable
();
/*
* The decrementer stops during the yield. Just force
* a fake decrementer now and the timer_interrupt
* code will straighten it all out
*/
paca
->
xLpPaca
.
xDecrInt
=
1
;
local_irq_enable
();
}
}
#endif
/* CONFIG_PPC_ISERIES */
arch/ppc/kernel/ppc6xx_idle.c
0 → 100644
View file @
0e67de54
/*
* BK Id: %F% %I% %G% %U% %#%
*/
/*
* power_save() rountine for classic PPC CPUs.
*
* Written by Cort Dougan (cort@cs.nmt.edu)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/stringify.h>
#include <asm/cputable.h>
#include <asm/current.h>
#include <asm/processor.h>
unsigned
long
powersave_nap
=
0
;
#define DSSALL .long (0x1f<<26)+(0x10<<21)+(0x336<<1)
void
ppc6xx_idle
(
void
)
{
unsigned
long
hid0
;
int
nap
=
powersave_nap
;
/* 7450 has no DOZE mode mode, we return if powersave_nap
* isn't enabled
*/
if
(
!
(
nap
||
(
cur_cpu_spec
[
smp_processor_id
()]
->
cpu_features
&
CPU_FTR_CAN_DOZE
)))
return
;
/*
* Disable interrupts to prevent a lost wakeup
* when going to sleep. This is necessary even with
* RTLinux since we are not guaranteed an interrupt
* didn't come in and is waiting for a __sti() before
* emulating one. This way, we really do hard disable.
*
* We assume that we're sti-ed when we come in here. We
* are in the idle loop so if we're cli-ed then it's a bug
* anyway.
* -- Cort
*/
_nmask_and_or_msr
(
MSR_EE
,
0
);
if
(
!
need_resched
())
{
__asm__
__volatile__
(
"mfspr %0,1008"
:
"=r"
(
hid0
)
:
);
hid0
&=
~
(
HID0_NAP
|
HID0_SLEEP
|
HID0_DOZE
);
hid0
|=
(
powersave_nap
?
HID0_NAP
:
HID0_DOZE
)
|
HID0_DPM
;
__asm__
__volatile__
(
"mtspr 1008,%0"
::
"r"
(
hid0
));
/* Flush pending data streams, consider this instruction
* exist on all altivec capable CPUs
*/
__asm__
__volatile__
(
"98: "
__stringify
(
DSSALL
)
"
\n
"
" sync
\n
"
"99:
\n
"
".section __ftr_fixup,
\"
a
\"\n
"
" .long %0
\n
"
" .long %1
\n
"
" .long 98b
\n
"
" .long 99b
\n
"
".previous"
::
"i"
(
CPU_FTR_ALTIVEC
),
"i"
(
CPU_FTR_ALTIVEC
));
/* set the POW bit in the MSR, and enable interrupts
* so we wake up sometime! */
_nmask_and_or_msr
(
0
,
MSR_POW
|
MSR_EE
);
}
_nmask_and_or_msr
(
0
,
MSR_EE
);
}
arch/ppc/kernel/setup.c
View file @
0e67de54
...
...
@@ -54,6 +54,8 @@ extern void xmon_map_scc(void);
extern
void
kgdb_map_scc
(
void
);
#endif
extern
void
ppc6xx_idle
(
void
);
extern
boot_infos_t
*
boot_infos
;
char
saved_command_line
[
256
];
unsigned
char
aux_device_present
;
...
...
@@ -528,6 +530,10 @@ machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
strcpy
(
cmd_line
,
CONFIG_CMDLINE
);
#endif
/* CONFIG_CMDLINE */
#if defined(CONFIG_6xx) || defined(CONFIG_ALL_PPC)
ppc_md
.
power_save
=
ppc6xx_idle
;
#endif
platform_init
(
r3
,
r4
,
r5
,
r6
,
r7
);
if
(
ppc_md
.
progress
)
...
...
arch/ppc/platforms/iSeries_setup.c
View file @
0e67de54
...
...
@@ -57,6 +57,7 @@ static void setup_iSeries_cache_sizes( void );
extern
void
iSeries_pci_Initialize
(
void
);
static
int
iSeries_show_cpuinfo
(
struct
seq_file
*
m
);
static
int
iSeries_show_percpuinfo
(
struct
seq_file
*
m
,
int
i
);
extern
void
iSeries_idle
(
void
);
extern
struct
pci_ops
iSeries_pci_ops
;
/* Global Variables */
...
...
@@ -537,6 +538,8 @@ iSeries_setup_arch(void)
mf_init();
viopath_init();
*/
ppc_md
.
idle
=
iSeries_idle
;
}
/*
...
...
include/asm-ppc/machdep.h
View file @
0e67de54
...
...
@@ -37,6 +37,9 @@ struct machdep_calls {
void
(
*
power_off
)(
void
);
void
(
*
halt
)(
void
);
void
(
*
idle
)(
void
);
void
(
*
power_save
)(
void
);
long
(
*
time_init
)(
void
);
/* Optional, may be NULL */
int
(
*
set_rtc_time
)(
unsigned
long
nowtime
);
unsigned
long
(
*
get_rtc_time
)(
void
);
...
...
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