/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include #include #include #include #include #include #include /* * This callback is used to build the PPM CPU domains once * all the CPU devices have been started. The callback is * initialized by the PPM driver to point to a routine that * will build the domains. */ void (*cpupm_rebuild_cpu_domains)(void); /* * This callback is used to reset the topspeed for all the * CPU devices. The callback is initialized by the PPM driver to * point to a routine that will reinitialize all the CPU devices * once all the CPU devices have been started and the CPU domains * built. */ void (*cpupm_init_topspeed)(void); /* * This callback is used to redefine the topspeed for a CPU device. * Since all CPUs in a domain should have identical properties, this * callback is initialized by the PPM driver to point to a routine * that will redefine the topspeed for all devices in a CPU domain. * This callback is exercised whenever an ACPI _PPC change notification * is received by the CPU driver. */ void (*cpupm_redefine_topspeed)(void *); /* * This callback is used by the PPM driver to call into the CPU driver * to find a CPU's current topspeed (i.e., it's current ACPI _PPC value). */ void (*cpupm_set_topspeed_callb)(void *, int); /* * This callback is used by the PPM driver to call into the CPU driver * to set a new topspeed for a CPU. */ int (*cpupm_get_topspeed_callb)(void *); static void cpupm_event_notify_handler(ACPI_HANDLE, UINT32, void *); static void cpupm_free_notify_handlers(cpu_t *); /* * Until proven otherwise, all power states are manageable. */ static uint32_t cpupm_enabled = CPUPM_ALL_STATES; /* * Until all CPUs have started, we do not allow * power management. */ static boolean_t cpupm_ready = B_FALSE; cpupm_state_domains_t *cpupm_pstate_domains = NULL; cpupm_state_domains_t *cpupm_tstate_domains = NULL; cpupm_state_domains_t *cpupm_cstate_domains = NULL; /* * c-state tunables * * cpupm_cs_idle_cost_tunable is the ratio of time CPU spends executing + idle * divided by time spent in the idle state transitions. * A value of 10 means the CPU will not spend more than 1/10 of its time * in idle latency. The worst case performance will be 90% of non Deep C-state * kernel. * * cpupm_cs_idle_save_tunable is how long we must stay in a deeper C-state * before it is worth going there. Expressed as a multiple of latency. */ uint32_t cpupm_cs_sample_tunable = 5; /* samples in decision period */ uint32_t cpupm_cs_idle_cost_tunable = 10; /* work time / latency cost */ uint32_t cpupm_cs_idle_save_tunable = 2; /* idle power savings */ uint16_t cpupm_C2_idle_pct_tunable = 70; uint16_t cpupm_C3_idle_pct_tunable = 80; #ifndef __xpv extern boolean_t cpupm_intel_init(cpu_t *); extern boolean_t cpupm_amd_init(cpu_t *); typedef struct cpupm_vendor { boolean_t (*cpuv_init)(cpu_t *); } cpupm_vendor_t; /* * Table of supported vendors. */ static cpupm_vendor_t cpupm_vendors[] = { cpupm_intel_init, cpupm_amd_init, NULL }; #endif /* * Initialize the machine. * See if a module exists for managing power for this CPU. */ /*ARGSUSED*/ void cpupm_init(cpu_t *cp) { #ifndef __xpv cpupm_vendor_t *vendors; cpupm_mach_state_t *mach_state; struct machcpu *mcpu = &(cp->cpu_m); int *speeds; uint_t nspeeds; int ret; mach_state = cp->cpu_m.mcpu_pm_mach_state = kmem_zalloc(sizeof (cpupm_mach_state_t), KM_SLEEP); mach_state->ms_caps = CPUPM_NO_STATES; mutex_init(&mach_state->ms_lock, NULL, MUTEX_DRIVER, NULL); mach_state->ms_acpi_handle = cpu_acpi_init(cp); if (mach_state->ms_acpi_handle == NULL) { cpupm_free(cp); cmn_err(CE_WARN, "!cpupm_init: processor %d: " "unable to get ACPI handle", cp->cpu_id); cmn_err(CE_NOTE, "!CPU power management will not function."); CPUPM_DISABLE(); return; } /* * Loop through the CPU management module table and see if * any of the modules implement CPU power management * for this CPU. */ for (vendors = cpupm_vendors; vendors->cpuv_init != NULL; vendors++) { if (vendors->cpuv_init(cp)) break; } /* * Nope, we can't power manage this CPU. */ if (vendors == NULL) { cpupm_free(cp); CPUPM_DISABLE(); return; } /* * If P-state support exists for this system, then initialize it. */ if (mach_state->ms_pstate.cma_ops != NULL) { ret = mach_state->ms_pstate.cma_ops->cpus_init(cp); if (ret != 0) { cmn_err(CE_WARN, "!cpupm_init: processor %d:" " unable to initialize P-state support", cp->cpu_id); mach_state->ms_pstate.cma_ops = NULL; cpupm_disable(CPUPM_P_STATES); } else { nspeeds = cpupm_get_speeds(cp, &speeds); if (nspeeds == 0) { cmn_err(CE_WARN, "!cpupm_init: processor %d:" " no speeds to manage", cp->cpu_id); } else { cpupm_set_supp_freqs(cp, speeds, nspeeds); cpupm_free_speeds(speeds, nspeeds); mach_state->ms_caps |= CPUPM_P_STATES; } } } if (mach_state->ms_tstate.cma_ops != NULL) { ret = mach_state->ms_tstate.cma_ops->cpus_init(cp); if (ret != 0) { char err_msg[128]; int p_res; p_res = snprintf(err_msg, sizeof (err_msg), "!cpupm_init: processor %d: unable to initialize " "T-state support", cp->cpu_id); if (p_res >= 0) DTRACE_PROBE1(cpu_ts_err_msg, char *, err_msg); mach_state->ms_tstate.cma_ops = NULL; cpupm_disable(CPUPM_T_STATES); } else { mach_state->ms_caps |= CPUPM_T_STATES; } } /* * If C-states support exists for this system, then initialize it. */ if (mach_state->ms_cstate.cma_ops != NULL) { ret = mach_state->ms_cstate.cma_ops->cpus_init(cp); if (ret != 0) { cmn_err(CE_WARN, "!cpupm_init: processor %d:" " unable to initialize C-state support", cp->cpu_id); mach_state->ms_cstate.cma_ops = NULL; mcpu->max_cstates = CPU_ACPI_C1; cpupm_disable(CPUPM_C_STATES); idle_cpu = non_deep_idle_cpu; disp_enq_thread = non_deep_idle_disp_enq_thread; } else if (cpu_deep_cstates_supported()) { mcpu->max_cstates = cpu_acpi_get_max_cstates( mach_state->ms_acpi_handle); if (mcpu->max_cstates > CPU_ACPI_C1) { hpet.callback(CST_EVENT_MULTIPLE_CSTATES); CPU->cpu_m.mcpu_idle_cpu = cpu_acpi_idle; mcpu->mcpu_idle_type = CPU_ACPI_C1; disp_enq_thread = cstate_wakeup; } else { hpet.callback(CST_EVENT_ONE_CSTATE); } mach_state->ms_caps |= CPUPM_C_STATES; } else { mcpu->max_cstates = CPU_ACPI_C1; idle_cpu = non_deep_idle_cpu; disp_enq_thread = non_deep_idle_disp_enq_thread; } } if (mach_state->ms_caps == CPUPM_NO_STATES) { cpupm_free(cp); CPUPM_DISABLE(); return; } if ((mach_state->ms_caps & CPUPM_T_STATES) || (mach_state->ms_caps & CPUPM_P_STATES) || (mach_state->ms_caps & CPUPM_C_STATES)) cpupm_add_notify_handler(cp, cpupm_event_notify_handler, cp); #endif } /* * Free any resources allocated by cpupm_init(). */ /*ARGSUSED*/ void cpupm_free(cpu_t *cp) { #ifndef __xpv cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; if (mach_state == NULL) return; if (mach_state->ms_pstate.cma_ops != NULL) { mach_state->ms_pstate.cma_ops->cpus_fini(cp); mach_state->ms_pstate.cma_ops = NULL; } if (mach_state->ms_tstate.cma_ops != NULL) { mach_state->ms_tstate.cma_ops->cpus_fini(cp); mach_state->ms_tstate.cma_ops = NULL; } if (mach_state->ms_cstate.cma_ops != NULL) { mach_state->ms_cstate.cma_ops->cpus_fini(cp); mach_state->ms_cstate.cma_ops = NULL; } cpupm_free_notify_handlers(cp); if (mach_state->ms_acpi_handle != NULL) { cpu_acpi_fini(mach_state->ms_acpi_handle); mach_state->ms_acpi_handle = NULL; } mutex_destroy(&mach_state->ms_lock); kmem_free(mach_state, sizeof (cpupm_mach_state_t)); cp->cpu_m.mcpu_pm_mach_state = NULL; #endif } /* * If all CPUs have started and at least one power state is manageable, * then the CPUs are ready for power management. */ boolean_t cpupm_is_ready() { #ifndef __xpv if (cpupm_enabled == CPUPM_NO_STATES) return (B_FALSE); return (cpupm_ready); #else return (B_FALSE); #endif } boolean_t cpupm_is_enabled(uint32_t state) { return ((cpupm_enabled & state) == state); } /* * By default, all states are enabled. */ void cpupm_disable(uint32_t state) { if (state & CPUPM_P_STATES) { cpupm_free_domains(&cpupm_pstate_domains); } if (state & CPUPM_T_STATES) { cpupm_free_domains(&cpupm_tstate_domains); } if (state & CPUPM_C_STATES) { cpupm_free_domains(&cpupm_cstate_domains); } cpupm_enabled &= ~state; } /* * Once all CPUs have been started, the PPM driver should build CPU * domains and initialize the topspeed for all CPU devices. */ void cpupm_post_startup() { #ifndef __xpv /* * The CPU domain built by the PPM during CPUs attaching * should be rebuilt with the information retrieved from * ACPI. */ if (cpupm_rebuild_cpu_domains != NULL) (*cpupm_rebuild_cpu_domains)(); /* * Only initialize the topspeed if P-states are enabled. */ if (cpupm_enabled & CPUPM_P_STATES && cpupm_init_topspeed != NULL) (*cpupm_init_topspeed)(); #endif cpupm_ready = B_TRUE; } /* * Allocate power domains for C,P and T States */ void cpupm_alloc_domains(cpu_t *cp, int state) { cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); cpu_acpi_handle_t handle = mach_state->ms_acpi_handle; cpupm_state_domains_t **dom_ptr; cpupm_state_domains_t *dptr; cpupm_state_domains_t **mach_dom_state_ptr; uint32_t domain; uint32_t type; switch (state) { case CPUPM_P_STATES: if (CPU_ACPI_IS_OBJ_CACHED(handle, CPU_ACPI_PSD_CACHED)) { domain = CPU_ACPI_PSD(handle).sd_domain; type = CPU_ACPI_PSD(handle).sd_type; } else { mutex_enter(&cpu_lock); domain = cpuid_get_chipid(cp); mutex_exit(&cpu_lock); type = CPU_ACPI_HW_ALL; } dom_ptr = &cpupm_pstate_domains; mach_dom_state_ptr = &mach_state->ms_pstate.cma_domain; break; case CPUPM_T_STATES: if (CPU_ACPI_IS_OBJ_CACHED(handle, CPU_ACPI_TSD_CACHED)) { domain = CPU_ACPI_TSD(handle).sd_domain; type = CPU_ACPI_TSD(handle).sd_type; } else { mutex_enter(&cpu_lock); domain = cpuid_get_chipid(cp); mutex_exit(&cpu_lock); type = CPU_ACPI_HW_ALL; } dom_ptr = &cpupm_tstate_domains; mach_dom_state_ptr = &mach_state->ms_tstate.cma_domain; break; case CPUPM_C_STATES: if (CPU_ACPI_IS_OBJ_CACHED(handle, CPU_ACPI_CSD_CACHED)) { domain = CPU_ACPI_CSD(handle).sd_domain; type = CPU_ACPI_CSD(handle).sd_type; } else { mutex_enter(&cpu_lock); domain = cpuid_get_coreid(cp); mutex_exit(&cpu_lock); type = CPU_ACPI_HW_ALL; } dom_ptr = &cpupm_cstate_domains; mach_dom_state_ptr = &mach_state->ms_cstate.cma_domain; break; default: return; } for (dptr = *dom_ptr; dptr != NULL; dptr = dptr->pm_next) { if (dptr->pm_domain == domain) break; } /* new domain is created and linked at the head */ if (dptr == NULL) { dptr = kmem_zalloc(sizeof (cpupm_state_domains_t), KM_SLEEP); dptr->pm_domain = domain; dptr->pm_type = type; dptr->pm_next = *dom_ptr; mutex_init(&dptr->pm_lock, NULL, MUTEX_SPIN, (void *)ipltospl(DISP_LEVEL)); CPUSET_ZERO(dptr->pm_cpus); *dom_ptr = dptr; } CPUSET_ADD(dptr->pm_cpus, cp->cpu_id); *mach_dom_state_ptr = dptr; } /* * Free C, P or T state power domains */ void cpupm_free_domains(cpupm_state_domains_t **dom_ptr) { cpupm_state_domains_t *this_domain, *next_domain; this_domain = *dom_ptr; while (this_domain != NULL) { next_domain = this_domain->pm_next; mutex_destroy(&this_domain->pm_lock); kmem_free((void *)this_domain, sizeof (cpupm_state_domains_t)); this_domain = next_domain; } *dom_ptr = NULL; } void cpupm_alloc_ms_cstate(cpu_t *cp) { cpupm_mach_state_t *mach_state; cpupm_mach_acpi_state_t *ms_cstate; mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); ms_cstate = &mach_state->ms_cstate; ASSERT(ms_cstate->cma_state.cstate == NULL); ms_cstate->cma_state.cstate = kmem_zalloc(sizeof (cma_c_state_t), KM_SLEEP); ms_cstate->cma_state.cstate->cs_next_cstate = CPU_ACPI_C1; } void cpupm_free_ms_cstate(cpu_t *cp) { cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); cpupm_mach_acpi_state_t *ms_cstate = &mach_state->ms_cstate; if (ms_cstate->cma_state.cstate != NULL) { kmem_free(ms_cstate->cma_state.cstate, sizeof (cma_c_state_t)); ms_cstate->cma_state.cstate = NULL; } } void cpupm_state_change(cpu_t *cp, int level, int state) { cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); cpupm_state_ops_t *state_ops; cpupm_state_domains_t *state_domain; cpuset_t set; DTRACE_PROBE2(cpupm__state__change, cpu_t *, cp, int, level); if (mach_state == NULL) { return; } switch (state) { case CPUPM_P_STATES: state_ops = mach_state->ms_pstate.cma_ops; state_domain = mach_state->ms_pstate.cma_domain; break; case CPUPM_T_STATES: state_ops = mach_state->ms_tstate.cma_ops; state_domain = mach_state->ms_tstate.cma_domain; break; default: break; } switch (state_domain->pm_type) { case CPU_ACPI_SW_ANY: /* * A request on any CPU in the domain transitions the domain */ CPUSET_ONLY(set, cp->cpu_id); state_ops->cpus_change(set, level); break; case CPU_ACPI_SW_ALL: /* * All CPUs in the domain must request the transition */ case CPU_ACPI_HW_ALL: /* * P/T-state transitions are coordinated by the hardware * For now, request the transition on all CPUs in the domain, * but looking ahead we can probably be smarter about this. */ mutex_enter(&state_domain->pm_lock); state_ops->cpus_change(state_domain->pm_cpus, level); mutex_exit(&state_domain->pm_lock); break; default: cmn_err(CE_WARN, "Unknown domain coordination type: %d", state_domain->pm_type); } } /* * CPU PM interfaces exposed to the CPU power manager */ /*ARGSUSED*/ id_t cpupm_plat_domain_id(cpu_t *cp, cpupm_dtype_t type) { cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); if ((mach_state == NULL) || (!cpupm_is_enabled(CPUPM_P_STATES) && !cpupm_is_enabled(CPUPM_C_STATES))) { return (CPUPM_NO_DOMAIN); } if (type == CPUPM_DTYPE_ACTIVE) { /* * Return P-State domain for the specified CPU */ if (mach_state->ms_pstate.cma_domain) { return (mach_state->ms_pstate.cma_domain->pm_domain); } } else if (type == CPUPM_DTYPE_IDLE) { /* * Return C-State domain for the specified CPU */ if (mach_state->ms_cstate.cma_domain) { return (mach_state->ms_cstate.cma_domain->pm_domain); } } return (CPUPM_NO_DOMAIN); } /*ARGSUSED*/ uint_t cpupm_plat_state_enumerate(cpu_t *cp, cpupm_dtype_t type, cpupm_state_t *states) { int *speeds; uint_t nspeeds, i; /* * Idle domain support unimplemented */ if (type != CPUPM_DTYPE_ACTIVE) { return (0); } nspeeds = cpupm_get_speeds(cp, &speeds); /* * If the caller passes NULL for states, just return the * number of states. */ if (states != NULL) { for (i = 0; i < nspeeds; i++) { states[i].cps_speed = speeds[i]; states[i].cps_handle = (cpupm_handle_t)i; } } cpupm_free_speeds(speeds, nspeeds); return (nspeeds); } /*ARGSUSED*/ int cpupm_plat_change_state(cpu_t *cp, cpupm_state_t *state) { if (!cpupm_is_ready()) return (-1); cpupm_state_change(cp, (int)state->cps_handle, CPUPM_P_STATES); return (0); } /*ARGSUSED*/ /* * Note: It is the responsibility of the users of * cpupm_get_speeds() to free the memory allocated * for speeds using cpupm_free_speeds() */ uint_t cpupm_get_speeds(cpu_t *cp, int **speeds) { #ifndef __xpv cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; return (cpu_acpi_get_speeds(mach_state->ms_acpi_handle, speeds)); #else return (0); #endif } /*ARGSUSED*/ void cpupm_free_speeds(int *speeds, uint_t nspeeds) { #ifndef __xpv cpu_acpi_free_speeds(speeds, nspeeds); #endif } /* * All CPU instances have been initialized successfully. */ boolean_t cpupm_power_ready(void) { return (cpupm_is_enabled(CPUPM_P_STATES) && cpupm_is_ready()); } /* * All CPU instances have been initialized successfully. */ boolean_t cpupm_throttle_ready(void) { return (cpupm_is_enabled(CPUPM_T_STATES) && cpupm_is_ready()); } /* * All CPU instances have been initialized successfully. */ boolean_t cpupm_cstate_ready(void) { return (cpupm_is_enabled(CPUPM_C_STATES) && cpupm_is_ready()); } void cpupm_notify_handler(ACPI_HANDLE obj, UINT32 val, void *ctx) { cpu_t *cp = ctx; cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); cpupm_notification_t *entry; mutex_enter(&mach_state->ms_lock); for (entry = mach_state->ms_handlers; entry != NULL; entry = entry->nq_next) { entry->nq_handler(obj, val, entry->nq_ctx); } mutex_exit(&mach_state->ms_lock); } /*ARGSUSED*/ void cpupm_add_notify_handler(cpu_t *cp, CPUPM_NOTIFY_HANDLER handler, void *ctx) { #ifndef __xpv cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; cpupm_notification_t *entry; entry = kmem_zalloc(sizeof (cpupm_notification_t), KM_SLEEP); entry->nq_handler = handler; entry->nq_ctx = ctx; mutex_enter(&mach_state->ms_lock); if (mach_state->ms_handlers == NULL) { entry->nq_next = NULL; mach_state->ms_handlers = entry; cpu_acpi_install_notify_handler(mach_state->ms_acpi_handle, cpupm_notify_handler, cp); } else { entry->nq_next = mach_state->ms_handlers; mach_state->ms_handlers = entry; } mutex_exit(&mach_state->ms_lock); #endif } /*ARGSUSED*/ static void cpupm_free_notify_handlers(cpu_t *cp) { #ifndef __xpv cpupm_mach_state_t *mach_state = (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; cpupm_notification_t *entry; cpupm_notification_t *next; mutex_enter(&mach_state->ms_lock); if (mach_state->ms_handlers == NULL) { mutex_exit(&mach_state->ms_lock); return; } if (mach_state->ms_acpi_handle != NULL) { cpu_acpi_remove_notify_handler(mach_state->ms_acpi_handle, cpupm_notify_handler); } entry = mach_state->ms_handlers; while (entry != NULL) { next = entry->nq_next; kmem_free(entry, sizeof (cpupm_notification_t)); entry = next; } mach_state->ms_handlers = NULL; mutex_exit(&mach_state->ms_lock); #endif } /* * Get the current max speed from the ACPI _PPC object */ /*ARGSUSED*/ int cpupm_get_top_speed(cpu_t *cp) { #ifndef __xpv cpupm_mach_state_t *mach_state; cpu_acpi_handle_t handle; int plat_level; uint_t nspeeds; int max_level; mach_state = (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; handle = mach_state->ms_acpi_handle; cpu_acpi_cache_ppc(handle); plat_level = CPU_ACPI_PPC(handle); nspeeds = CPU_ACPI_PSTATES_COUNT(handle); max_level = nspeeds - 1; if ((plat_level < 0) || (plat_level > max_level)) { cmn_err(CE_NOTE, "!cpupm_get_top_speed: CPU %d: " "_PPC out of range %d", cp->cpu_id, plat_level); plat_level = 0; } return (plat_level); #else return (0); #endif } /* * This notification handler is called whenever the ACPI _PPC * object changes. The _PPC is a sort of governor on power levels. * It sets an upper threshold on which, _PSS defined, power levels * are usuable. The _PPC value is dynamic and may change as properties * (i.e., thermal or AC source) of the system change. */ static void cpupm_power_manage_notifications(void *ctx) { cpu_t *cp = ctx; int top_speed; top_speed = cpupm_get_top_speed(cp); cpupm_redefine_max_activepwr_state(cp, top_speed); } /* ARGSUSED */ static void cpupm_event_notify_handler(ACPI_HANDLE obj, UINT32 val, void *ctx) { #ifndef __xpv /* * Currently, we handle _TPC,_CST and _PPC change notifications. */ if (val == CPUPM_TPC_CHANGE_NOTIFICATION) { cpupm_throttle_manage_notification(ctx); } else if (val == CPUPM_CST_CHANGE_NOTIFICATION) { cpuidle_manage_cstates(ctx); } else if (val == CPUPM_PPC_CHANGE_NOTIFICATION) { cpupm_power_manage_notifications(ctx); } #endif } /* * Update cpupm cstate data each time CPU exits idle. */ void cpupm_wakeup_cstate_data(cma_c_state_t *cs_data, hrtime_t end) { cs_data->cs_idle_exit = end; } /* * Determine next cstate based on cpupm data. * Update cpupm cstate data each time CPU goes idle. * Do as much as possible in the idle state bookkeeping function because the * performance impact while idle is minimal compared to in the wakeup function * when there is real work to do. */ uint32_t cpupm_next_cstate(cma_c_state_t *cs_data, cpu_acpi_cstate_t *cstates, uint32_t cs_count, hrtime_t start) { hrtime_t duration; hrtime_t ave_interval; hrtime_t ave_idle_time; uint32_t i; duration = cs_data->cs_idle_exit - cs_data->cs_idle_enter; scalehrtime(&duration); cs_data->cs_idle += duration; cs_data->cs_idle_enter = start; ++cs_data->cs_cnt; if (cs_data->cs_cnt > cpupm_cs_sample_tunable) { cs_data->cs_smpl_len = start - cs_data->cs_smpl_start; scalehrtime(&cs_data->cs_smpl_len); cs_data->cs_smpl_len |= 1; /* protect from DIV 0 */ cs_data->cs_smpl_idle = cs_data->cs_idle; cs_data->cs_idle = 0; cs_data->cs_smpl_idle_pct = ((100 * cs_data->cs_smpl_idle) / cs_data->cs_smpl_len); cs_data->cs_smpl_start = start; cs_data->cs_cnt = 0; /* * Strand level C-state policy * The cpu_acpi_cstate_t *cstates array is not required to * have an entry for both CPU_ACPI_C2 and CPU_ACPI_C3. * There are cs_count entries in the cstates array. * cs_data->cs_next_cstate contains the index of the next * C-state this CPU should enter. */ ASSERT(cstates[0].cs_type == CPU_ACPI_C1); /* * Will CPU be idle long enough to save power? */ ave_idle_time = (cs_data->cs_smpl_idle / cpupm_cs_sample_tunable) / 1000; for (i = 1; i < cs_count; ++i) { if (ave_idle_time < (cstates[i].cs_latency * cpupm_cs_idle_save_tunable)) { cs_count = i; DTRACE_PROBE2(cpupm__next__cstate, cpu_t *, CPU, int, i); } } /* * Wakeup often (even when non-idle time is very short)? * Some producer/consumer type loads fall into this category. */ ave_interval = (cs_data->cs_smpl_len / cpupm_cs_sample_tunable) / 1000; for (i = 1; i < cs_count; ++i) { if (ave_interval <= (cstates[i].cs_latency * cpupm_cs_idle_cost_tunable)) { cs_count = i; DTRACE_PROBE2(cpupm__next__cstate, cpu_t *, CPU, int, (CPU_MAX_CSTATES + i)); } } /* * Idle percent */ for (i = 1; i < cs_count; ++i) { switch (cstates[i].cs_type) { case CPU_ACPI_C2: if (cs_data->cs_smpl_idle_pct < cpupm_C2_idle_pct_tunable) { cs_count = i; DTRACE_PROBE2(cpupm__next__cstate, cpu_t *, CPU, int, ((2 * CPU_MAX_CSTATES) + i)); } break; case CPU_ACPI_C3: if (cs_data->cs_smpl_idle_pct < cpupm_C3_idle_pct_tunable) { cs_count = i; DTRACE_PROBE2(cpupm__next__cstate, cpu_t *, CPU, int, ((2 * CPU_MAX_CSTATES) + i)); } break; } } cs_data->cs_next_cstate = cs_count - 1; } return (cs_data->cs_next_cstate); }