On Wednesday 25 April 2007 22:40, Shaohua Li wrote:
> With CPUIDLE framework, the max_cstate (to limit max cpu c-state) parameter is ingored. Some systems require it to ignore C2/C3 and some drivers like ipw require it too.
>
> Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
>
> ---
> drivers/acpi/osl.c | 10 ++++++++++
> drivers/acpi/processor_core.c | 2 ++
> drivers/acpi/processor_idle.c | 23 +++++++++++++++++++++--
> include/acpi/processor.h | 1 +
> include/linux/acpi.h | 7 ++-----
> 5 files changed, 36 insertions(+), 7 deletions(-)
>
> Index: 21-rc6-mm1/drivers/acpi/osl.c
> ===================================================================
> --- 21-rc6-mm1.orig/drivers/acpi/osl.c 2007-04-26 10:06:41.000000000 +0800
> +++ 21-rc6-mm1/drivers/acpi/osl.c 2007-04-26 10:11:15.000000000 +0800
> @@ -996,6 +996,16 @@ unsigned int max_cstate = ACPI_PROCESSOR
>
> EXPORT_SYMBOL(max_cstate);
>
> +void (*acpi_do_set_cstate_limit)(void);
> +EXPORT_SYMBOL(acpi_do_set_cstate_limit);
there must be a better name for this than ...do...
> +
> +void acpi_set_cstate_limit(unsigned int new_limit)
> +{
> + max_cstate = new_limit;
> + if (acpi_do_set_cstate_limit)
> + acpi_do_set_cstate_limit();
> +}
> +
> /*
> * Acquire a spinlock.
> *
> Index: 21-rc6-mm1/drivers/acpi/processor_core.c
> ===================================================================
> --- 21-rc6-mm1.orig/drivers/acpi/processor_core.c 2007-04-26 10:06:41.000000000 +0800
> +++ 21-rc6-mm1/drivers/acpi/processor_core.c 2007-04-26 10:11:15.000000000 +0800
> @@ -1030,11 +1030,13 @@ static int __init acpi_processor_init(vo
> acpi_processor_ppc_init();
>
> cpuidle_register_driver(&acpi_idle_driver);
> + acpi_do_set_cstate_limit = acpi_max_cstate_changed;
> return 0;
> }
>
> static void __exit acpi_processor_exit(void)
> {
> + acpi_do_set_cstate_limit = NULL;
> cpuidle_unregister_driver(&acpi_idle_driver);
>
> acpi_processor_ppc_exit();
> Index: 21-rc6-mm1/drivers/acpi/processor_idle.c
> ===================================================================
> --- 21-rc6-mm1.orig/drivers/acpi/processor_idle.c 2007-04-26 10:09:07.000000000 +0800
> +++ 21-rc6-mm1/drivers/acpi/processor_idle.c 2007-04-26 10:11:15.000000000 +0800
> @@ -75,7 +75,26 @@ ACPI_MODULE_NAME("processor_idle");
> #define C2_OVERHEAD 1 /* 1us */
> #define C3_OVERHEAD 1 /* 1us */
>
> -module_param(max_cstate, uint, 0644);
but kernel-parameters.txt says this:
processor.max_cstate= [HW,ACPI]
Limit processor to maximum C-state
max_cstate=9 overrides any DMI blacklist limit.
> +void acpi_max_cstate_changed(void)
> +{
> + /* Driver will reset devices' max cstate limit */
> + cpuidle_force_redetect_devices(&acpi_idle_driver);
> +}
> +
> +static int change_max_cstate(const char *val, struct kernel_param *kp)
> +{
> + int max;
> +
> + max = simple_strtol(val, NULL, 0);
> + if (!max)
> + return -EINVAL;
> + max_cstate = max;
> + if (acpi_do_set_cstate_limit)
> + acpi_do_set_cstate_limit();
> + return 0;
> +}
> +
> +module_param_call(max_cstate, change_max_cstate, param_get_uint, &max_cstate, 0644);
>
> static unsigned int nocst __read_mostly;
> module_param(nocst, uint, 0000);
> @@ -1055,7 +1074,7 @@ static int acpi_idle_init(struct cpuidle
> return -EINVAL;
> }
>
> - for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
> + for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
> cx = &pr->power.states[i];
> state = &dev->states[count];
>
> Index: 21-rc6-mm1/include/linux/acpi.h
> ===================================================================
> --- 21-rc6-mm1.orig/include/linux/acpi.h 2007-04-26 10:06:41.000000000 +0800
> +++ 21-rc6-mm1/include/linux/acpi.h 2007-04-26 10:11:15.000000000 +0800
> @@ -205,11 +205,8 @@ static inline unsigned int acpi_get_csta
> {
> return max_cstate;
> }
> -static inline void acpi_set_cstate_limit(unsigned int new_limit)
> -{
> - max_cstate = new_limit;
> - return;
> -}
WARNING: "acpi_set_cstate_limit" [drivers/net/wireless/ipw2100.ko] undefined!
make[1]: *** [__modpost] Error 1
> +extern void (*acpi_do_set_cstate_limit)(void);
> +extern void acpi_set_cstate_limit(unsigned int new_limit);
> #else
> static inline unsigned int acpi_get_cstate_limit(void) { return 0; }
> static inline void acpi_set_cstate_limit(unsigned int new_limit) { return; }
> Index: 21-rc6-mm1/include/acpi/processor.h
> ===================================================================
> --- 21-rc6-mm1.orig/include/acpi/processor.h 2007-04-26 10:06:41.000000000 +0800
> +++ 21-rc6-mm1/include/acpi/processor.h 2007-04-26 10:11:15.000000000 +0800
> @@ -277,6 +277,7 @@ int acpi_processor_cst_has_changed(struc
> int acpi_processor_power_exit(struct acpi_processor *pr,
> struct acpi_device *device);
> extern struct cpuidle_driver acpi_idle_driver;
> +void acpi_max_cstate_changed(void);
>
> /* in processor_thermal.c */
> int acpi_processor_get_limit_info(struct acpi_processor *pr);
> -
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