/* * processor_idle - idle state submodule to the ACPI processor driver * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> * - Added processor hotplug support * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> * - Added support for C3 on SMP * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/cpufreq.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/acpi.h>#include <linux/dmi.h>#include <linux/moduleparam.h>#include <linux/sched.h> /* need_resched() */ #include <asm/io.h>#include <asm/uaccess.h> #include <acpi/acpi_bus.h>#include <acpi/processor.h> #define ACPI_PROCESSOR_COMPONENT 0x01000000#define ACPI_PROCESSOR_CLASS "processor"#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"#define _COMPONENT ACPI_PROCESSOR_COMPONENTACPI_MODULE_NAME("acpi_processor")#define ACPI_PROCESSOR_FILE_POWER "power"#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)#define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */#define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */static void (*pm_idle_save) (void);module_param(max_cstate, uint, 0644); static unsigned int nocst = 0;module_param(nocst, uint, 0000); /* * bm_history -- bit-mask with a bit per jiffy of bus-master activity * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms * 100 HZ: 0x0000000F: 4 jiffies = 40ms * reduce history for more aggressive entry into C3 */static unsigned int bm_history = (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));module_param(bm_history, uint, 0644);/* -------------------------------------------------------------------------- Power Management -------------------------------------------------------------------------- */ /* * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. * For now disable this. Probably a bug somewhere else. * * To skip this limit, boot/load with a large max_cstate limit. */static int set_max_cstate(struct dmi_system_id *id){ if (max_cstate > ACPI_PROCESSOR_MAX_POWER) return 0; printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." " Override with \"processor.max_cstate=%d\"\n", id->ident, (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); max_cstate = (long)id->driver_data; return 0;} /* Actually this shouldn't be __cpuinitdata, would be better to fix the callers to only run once -AK */static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, { set_max_cstate, "Medion 41700", { DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, { set_max_cstate, "Clevo 5600D", { DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, (void *)2}, {},}; static inline u32 ticks_elapsed(u32 t1, u32 t2){ if (t2 >= t1) return (t2 - t1); else if (!acpi_fadt.tmr_val_ext) return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); else return ((0xFFFFFFFF - t1) + t2);} static voidacpi_processor_power_activate(struct acpi_processor *pr, struct acpi_processor_cx *new){ struct acpi_processor_cx *old; if (!pr || !new) return; old = pr->power.state; if (old) old->promotion.count = 0; new->demotion.count = 0; /* Cleanup from old state. */ if (old) { switch (old->type) { case ACPI_STATE_C3: /* Disable bus master reload */ if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK); break; } } /* Prepare to use new state. */ switch (new->type) { case ACPI_STATE_C3: /* Enable bus master reload */ if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK); break; } pr->power.state = new; return;} static void acpi_safe_halt(void){ clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb__after_clear_bit(); if (!need_resched()) safe_halt(); set_thread_flag(TIF_POLLING_NRFLAG);} static atomic_t c3_cpu_count; static void acpi_processor_idle(void){ struct acpi_processor *pr = NULL; struct acpi_processor_cx *cx = NULL; struct acpi_processor_cx *next_state = NULL; int sleep_ticks = 0; u32 t1, t2 = 0; pr = processors[smp_processor_id()]; if (!pr) return; /* * Interrupts must be disabled during bus mastering calculations and * for C2/C3 transitions. */ local_irq_disable(); /* * Check whether we truly need to go idle, or should * reschedule: */ if (unlikely(need_resched())) { local_irq_enable(); return; } cx = pr->power.state; if (!cx) { if (pm_idle_save) pm_idle_save(); else acpi_safe_halt(); return; } /* * Check BM Activity * ----------------- * Check for bus mastering activity (if required), record, and check * for demotion. */ if (pr->flags.bm_check) { u32 bm_status = 0; unsigned long diff = jiffies - pr->power.bm_check_timestamp; if (diff > 32) diff = 32; while (diff) { /* if we didn't get called, assume there was busmaster activity */ diff--; if (diff) pr->power.bm_activity |= 0x1; pr->power.bm_activity <<= 1; } acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status, ACPI_MTX_DO_NOT_LOCK); if (bm_status) { pr->power.bm_activity++; acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1, ACPI_MTX_DO_NOT_LOCK); } /* * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect * the true state of bus mastering activity; forcing us to * manually check the BMIDEA bit of each IDE channel. */ else if (errata.piix4.bmisx) { if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) pr->power.bm_activity++; } pr->power.bm_check_timestamp = jiffies; /* * Apply bus mastering demotion policy. Automatically demote * to avoid a faulty transition. Note that the processor * won't enter a low-power state during this call (to this * funciton) but should upon the next. * * TBD: A better policy might be to fallback to the demotion * state (use it for this quantum only) istead of * demoting -- and rely on duration as our sole demotion * qualification. This may, however, introduce DMA * issues (e.g. floppy DMA transfer overrun/underrun). */ if (pr->power.bm_activity & cx->demotion.threshold.bm) { local_irq_enable(); next_state = cx->demotion.state; goto end; } } #ifdef CONFIG_HOTPLUG_CPU /* * Check for P_LVL2_UP flag before entering C2 and above on * an SMP system. We do it here instead of doing it at _CST/P_LVL * detection phase, to work cleanly with logical CPU hotplug. */ if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && !pr->flags.has_cst && !acpi_fadt.plvl2_up) cx = &pr->power.states[ACPI_STATE_C1];#endif cx->usage++; /* * Sleep: * ------ * Invoke the current Cx state to put the processor to sleep. */ if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb__after_clear_bit(); if (need_resched()) { set_thread_flag(TIF_POLLING_NRFLAG); local_irq_enable(); return; } } switch (cx->type) { case ACPI_STATE_C1: /* * Invoke C1. * Use the appropriate idle routine, the one that would * be used without acpi C-states. */ if (pm_idle_save) pm_idle_save(); else acpi_safe_halt(); /* * TBD: Can't get time duration while in C1, as resumes * go to an ISR rather than here. Need to instrument * base interrupt handler. */ sleep_ticks = 0xFFFFFFFF; break; case ACPI_STATE_C2: /* Get start time (ticks) */ t1 = inl(acpi_fadt.xpm_tmr_blk.address); /* Invoke C2 */ inb(cx->address); /* Dummy op - must do something useless after P_LVL2 read */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Get end time (ticks) */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); /* Compute time (ticks) that we were actually asleep */ sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; break; case ACPI_STATE_C3: if (pr->flags.bm_check) { if (atomic_inc_return(&c3_cpu_count) == num_online_cpus()) { /* * All CPUs are trying to go to C3 * Disable bus master arbitration */ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK); } } else { /* SMP with no shared cache... Invalidate cache */ ACPI_FLUSH_CPU_CACHE(); } /* Get start time (ticks) */ t1 = inl(acpi_fadt.xpm_tmr_blk.address); /* Invoke C3 */ inb(cx->address); /* Dummy op - must do something useless after P_LVL3 read */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Get end time (ticks) */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); if (pr->flags.bm_check) { /* Enable bus master arbitration */ atomic_dec(&c3_cpu_count); acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK); } /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); /* Compute time (ticks) that we were actually asleep */ sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; break; default: local_irq_enable(); return; } next_state = pr->power.state; #ifdef CONFIG_HOTPLUG_CPU /* Don't do promotion/demotion */ if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && !pr->flags.has_cst && !acpi_fadt.plvl2_up) { next_state = cx; goto end; }#endif /* * Promotion? * ---------- * Track the number of longs (time asleep is greater than threshold) * and promote when the count threshold is reached. Note that bus * mastering activity may prevent promotions. * Do not promote above max_cstate. */ if (cx->promotion.state && ((cx->promotion.state - pr->power.states) <= max_cstate)) { if (sleep_ticks > cx->promotion.threshold.ticks) { cx->promotion.count++; cx->demotion.count = 0; if (cx->promotion.count >= cx->promotion.threshold.count) { if (pr->flags.bm_check) { if (! (pr->power.bm_activity & cx-> promotion.threshold.bm)) { next_state = cx->promotion.state; goto end; } } else { next_state = cx->promotion.state; goto end; } } } } /* * Demotion? * --------- * Track the number of shorts (time asleep is less than time threshold) * and demote when the usage threshold is reached. */ if (cx->demotion.state) { if (sleep_ticks < cx->demotion.threshold.ticks) { cx->demotion.count++; cx->promotion.count = 0; if (cx->demotion.count >= cx->demotion.threshold.count) { next_state = cx->demotion.state; goto end; } } } end: /* * Demote if current state exceeds max_cstate */ if ((pr->power.state - pr->power.states) > max_cstate) { if (cx->demotion.state) next_state = cx->demotion.state; } /* * New Cx State? * ------------- * If we're going to start using a new Cx state we must clean up * from the previous and prepare to use the new. */ if (next_state != pr->power.state) acpi_processor_power_activate(pr, next_state);Lines 1–500 of 1174. Load more
/* * processor_idle - idle state submodule to the ACPI processor driver * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> * - Added processor hotplug support * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> * - Added support for C3 on SMP * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/cpufreq.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/moduleparam.h> #include <linux/sched.h> /* need_resched() */ #include <asm/io.h> #include <asm/uaccess.h> #include <acpi/acpi_bus.h> #include <acpi/processor.h> #define ACPI_PROCESSOR_COMPONENT 0x01000000 #define ACPI_PROCESSOR_CLASS "processor" #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" #define _COMPONENT ACPI_PROCESSOR_COMPONENT ACPI_MODULE_NAME("acpi_processor") #define ACPI_PROCESSOR_FILE_POWER "power" #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ static void (*pm_idle_save) (void); module_param(max_cstate, uint, 0644); static unsigned int nocst = 0; module_param(nocst, uint, 0000); /* * bm_history -- bit-mask with a bit per jiffy of bus-master activity * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms * 100 HZ: 0x0000000F: 4 jiffies = 40ms * reduce history for more aggressive entry into C3 */ static unsigned int bm_history = (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); module_param(bm_history, uint, 0644); /* -------------------------------------------------------------------------- Power Management -------------------------------------------------------------------------- */ /* * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. * For now disable this. Probably a bug somewhere else. * * To skip this limit, boot/load with a large max_cstate limit. */ static int set_max_cstate(struct dmi_system_id *id) { if (max_cstate > ACPI_PROCESSOR_MAX_POWER) return 0; printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." " Override with \"processor.max_cstate=%d\"\n", id->ident, (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); max_cstate = (long)id->driver_data; return 0; } /* Actually this shouldn't be __cpuinitdata, would be better to fix the callers to only run once -AK */ static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, { set_max_cstate, "IBM ThinkPad R40e", { DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, { set_max_cstate, "Medion 41700", { DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, { set_max_cstate, "Clevo 5600D", { DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, (void *)2}, {}, }; static inline u32 ticks_elapsed(u32 t1, u32 t2) { if (t2 >= t1) return (t2 - t1); else if (!acpi_fadt.tmr_val_ext) return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); else return ((0xFFFFFFFF - t1) + t2); } static void acpi_processor_power_activate(struct acpi_processor *pr, struct acpi_processor_cx *new) { struct acpi_processor_cx *old; if (!pr || !new) return; old = pr->power.state; if (old) old->promotion.count = 0; new->demotion.count = 0; /* Cleanup from old state. */ if (old) { switch (old->type) { case ACPI_STATE_C3: /* Disable bus master reload */ if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK); break; } } /* Prepare to use new state. */ switch (new->type) { case ACPI_STATE_C3: /* Enable bus master reload */ if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK); break; } pr->power.state = new; return; } static void acpi_safe_halt(void) { clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb__after_clear_bit(); if (!need_resched()) safe_halt(); set_thread_flag(TIF_POLLING_NRFLAG); } static atomic_t c3_cpu_count; static void acpi_processor_idle(void) { struct acpi_processor *pr = NULL; struct acpi_processor_cx *cx = NULL; struct acpi_processor_cx *next_state = NULL; int sleep_ticks = 0; u32 t1, t2 = 0; pr = processors[smp_processor_id()]; if (!pr) return; /* * Interrupts must be disabled during bus mastering calculations and * for C2/C3 transitions. */ local_irq_disable(); /* * Check whether we truly need to go idle, or should * reschedule: */ if (unlikely(need_resched())) { local_irq_enable(); return; } cx = pr->power.state; if (!cx) { if (pm_idle_save) pm_idle_save(); else acpi_safe_halt(); return; } /* * Check BM Activity * ----------------- * Check for bus mastering activity (if required), record, and check * for demotion. */ if (pr->flags.bm_check) { u32 bm_status = 0; unsigned long diff = jiffies - pr->power.bm_check_timestamp; if (diff > 32) diff = 32; while (diff) { /* if we didn't get called, assume there was busmaster activity */ diff--; if (diff) pr->power.bm_activity |= 0x1; pr->power.bm_activity <<= 1; } acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status, ACPI_MTX_DO_NOT_LOCK); if (bm_status) { pr->power.bm_activity++; acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1, ACPI_MTX_DO_NOT_LOCK); } /* * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect * the true state of bus mastering activity; forcing us to * manually check the BMIDEA bit of each IDE channel. */ else if (errata.piix4.bmisx) { if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) pr->power.bm_activity++; } pr->power.bm_check_timestamp = jiffies; /* * Apply bus mastering demotion policy. Automatically demote * to avoid a faulty transition. Note that the processor * won't enter a low-power state during this call (to this * funciton) but should upon the next. * * TBD: A better policy might be to fallback to the demotion * state (use it for this quantum only) istead of * demoting -- and rely on duration as our sole demotion * qualification. This may, however, introduce DMA * issues (e.g. floppy DMA transfer overrun/underrun). */ if (pr->power.bm_activity & cx->demotion.threshold.bm) { local_irq_enable(); next_state = cx->demotion.state; goto end; } } #ifdef CONFIG_HOTPLUG_CPU /* * Check for P_LVL2_UP flag before entering C2 and above on * an SMP system. We do it here instead of doing it at _CST/P_LVL * detection phase, to work cleanly with logical CPU hotplug. */ if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && !pr->flags.has_cst && !acpi_fadt.plvl2_up) cx = &pr->power.states[ACPI_STATE_C1]; #endif cx->usage++; /* * Sleep: * ------ * Invoke the current Cx state to put the processor to sleep. */ if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb__after_clear_bit(); if (need_resched()) { set_thread_flag(TIF_POLLING_NRFLAG); local_irq_enable(); return; } } switch (cx->type) { case ACPI_STATE_C1: /* * Invoke C1. * Use the appropriate idle routine, the one that would * be used without acpi C-states. */ if (pm_idle_save) pm_idle_save(); else acpi_safe_halt(); /* * TBD: Can't get time duration while in C1, as resumes * go to an ISR rather than here. Need to instrument * base interrupt handler. */ sleep_ticks = 0xFFFFFFFF; break; case ACPI_STATE_C2: /* Get start time (ticks) */ t1 = inl(acpi_fadt.xpm_tmr_blk.address); /* Invoke C2 */ inb(cx->address); /* Dummy op - must do something useless after P_LVL2 read */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Get end time (ticks) */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); /* Compute time (ticks) that we were actually asleep */ sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD; break; case ACPI_STATE_C3: if (pr->flags.bm_check) { if (atomic_inc_return(&c3_cpu_count) == num_online_cpus()) { /* * All CPUs are trying to go to C3 * Disable bus master arbitration */ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK); } } else { /* SMP with no shared cache... Invalidate cache */ ACPI_FLUSH_CPU_CACHE(); } /* Get start time (ticks) */ t1 = inl(acpi_fadt.xpm_tmr_blk.address); /* Invoke C3 */ inb(cx->address); /* Dummy op - must do something useless after P_LVL3 read */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Get end time (ticks) */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); if (pr->flags.bm_check) { /* Enable bus master arbitration */ atomic_dec(&c3_cpu_count); acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK); } /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); /* Compute time (ticks) that we were actually asleep */ sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD; break; default: local_irq_enable(); return; } next_state = pr->power.state; #ifdef CONFIG_HOTPLUG_CPU /* Don't do promotion/demotion */ if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && !pr->flags.has_cst && !acpi_fadt.plvl2_up) { next_state = cx; goto end; } #endif /* * Promotion? * ---------- * Track the number of longs (time asleep is greater than threshold) * and promote when the count threshold is reached. Note that bus * mastering activity may prevent promotions. * Do not promote above max_cstate. */ if (cx->promotion.state && ((cx->promotion.state - pr->power.states) <= max_cstate)) { if (sleep_ticks > cx->promotion.threshold.ticks) { cx->promotion.count++; cx->demotion.count = 0; if (cx->promotion.count >= cx->promotion.threshold.count) { if (pr->flags.bm_check) { if (! (pr->power.bm_activity & cx-> promotion.threshold.bm)) { next_state = cx->promotion.state; goto end; } } else { next_state = cx->promotion.state; goto end; } } } } /* * Demotion? * --------- * Track the number of shorts (time asleep is less than time threshold) * and demote when the usage threshold is reached. */ if (cx->demotion.state) { if (sleep_ticks < cx->demotion.threshold.ticks) { cx->demotion.count++; cx->promotion.count = 0; if (cx->demotion.count >= cx->demotion.threshold.count) { next_state = cx->demotion.state; goto end; } } } end: /* * Demote if current state exceeds max_cstate */ if ((pr->power.state - pr->power.states) > max_cstate) { if (cx->demotion.state) next_state = cx->demotion.state; } /* * New Cx State? * ------------- * If we're going to start using a new Cx state we must clean up * from the previous and prepare to use the new. */ if (next_state != pr->power.state) acpi_processor_power_activate(pr, next_state);