/* * pseries_idle_probe() * Choose state table for shared versus dedicated partition */ static int pseries_idle_probe(void) { if (cpuidle_disable != IDLE_NO_OVERRIDE) return -ENODEV; if (firmware_has_feature(FW_FEATURE_SPLPAR)) { if (lppaca_shared_proc(get_lppaca())) { cpuidle_state_table = shared_states; max_idle_state = ARRAY_SIZE(shared_states); } else { cpuidle_state_table = dedicated_states; max_idle_state = ARRAY_SIZE(dedicated_states); } } else return -ENODEV; return 0; }
static void pseries_mach_cpu_die(void) { unsigned int cpu = smp_processor_id(); unsigned int hwcpu = hard_smp_processor_id(); u8 cede_latency_hint = 0; local_irq_disable(); idle_task_exit(); if (xive_enabled()) xive_teardown_cpu(); else xics_teardown_cpu(); if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { set_cpu_current_state(cpu, CPU_STATE_INACTIVE); if (ppc_md.suspend_disable_cpu) ppc_md.suspend_disable_cpu(); cede_latency_hint = 2; get_lppaca()->idle = 1; if (!lppaca_shared_proc(get_lppaca())) get_lppaca()->donate_dedicated_cpu = 1; while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { while (!prep_irq_for_idle()) { local_irq_enable(); local_irq_disable(); } extended_cede_processor(cede_latency_hint); } local_irq_disable(); if (!lppaca_shared_proc(get_lppaca())) get_lppaca()->donate_dedicated_cpu = 0; get_lppaca()->idle = 0; if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) { unregister_slb_shadow(hwcpu); hard_irq_disable(); /* * Call to start_secondary_resume() will not return. * Kernel stack will be reset and start_secondary() * will be called to continue the online operation. */ start_secondary_resume(); } } /* Requested state is CPU_STATE_OFFLINE at this point */ WARN_ON(get_preferred_offline_state(cpu) != CPU_STATE_OFFLINE); set_cpu_current_state(cpu, CPU_STATE_OFFLINE); unregister_slb_shadow(hwcpu); rtas_stop_self(); /* Should never get here... */ BUG(); for(;;); }