diff options
| -rw-r--r-- | arch/powerpc/platforms/Kconfig | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 101 | ||||
| -rw-r--r-- | include/linux/cpuidle.h | 2 |
3 files changed, 23 insertions, 86 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 3fe6d927ad7..31e1adeaa92 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -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) diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index f2446da7f2d..164839cb9fc 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -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)) @@ -585,77 +589,6 @@ static int __init pSeries_probe(void) return 1; } -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)) diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 7408af843b8..23f81de5182 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -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; } |