11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * processor_idle - idle state submodule to the ACPI processor driver 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6c5ab81caSDominik Brodowski * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> 71da177e4SLinus Torvalds * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 81da177e4SLinus Torvalds * - Added processor hotplug support 902df8b93SVenkatesh Pallipadi * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 1002df8b93SVenkatesh Pallipadi * - Added support for C3 on SMP 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 151da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 171da177e4SLinus Torvalds * your option) any later version. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 201da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 211da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 221da177e4SLinus Torvalds * General Public License for more details. 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 251da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 261da177e4SLinus Torvalds * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 271da177e4SLinus Torvalds * 281da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 291da177e4SLinus Torvalds */ 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <linux/kernel.h> 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/init.h> 341da177e4SLinus Torvalds #include <linux/cpufreq.h> 351da177e4SLinus Torvalds #include <linux/proc_fs.h> 361da177e4SLinus Torvalds #include <linux/seq_file.h> 371da177e4SLinus Torvalds #include <linux/acpi.h> 381da177e4SLinus Torvalds #include <linux/dmi.h> 391da177e4SLinus Torvalds #include <linux/moduleparam.h> 404e57b681STim Schmielau #include <linux/sched.h> /* need_resched() */ 415c87579eSArjan van de Ven #include <linux/latency.h> 42e9e2cdb4SThomas Gleixner #include <linux/clockchips.h> 434f86d3a8SLen Brown #include <linux/cpuidle.h> 441da177e4SLinus Torvalds 453434933bSThomas Gleixner /* 463434933bSThomas Gleixner * Include the apic definitions for x86 to have the APIC timer related defines 473434933bSThomas Gleixner * available also for UP (on SMP it gets magically included via linux/smp.h). 483434933bSThomas Gleixner * asm/acpi.h is not an option, as it would require more include magic. Also 493434933bSThomas Gleixner * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. 503434933bSThomas Gleixner */ 513434933bSThomas Gleixner #ifdef CONFIG_X86 523434933bSThomas Gleixner #include <asm/apic.h> 533434933bSThomas Gleixner #endif 543434933bSThomas Gleixner 551da177e4SLinus Torvalds #include <asm/io.h> 561da177e4SLinus Torvalds #include <asm/uaccess.h> 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #include <acpi/acpi_bus.h> 591da177e4SLinus Torvalds #include <acpi/processor.h> 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #define ACPI_PROCESSOR_COMPONENT 0x01000000 621da177e4SLinus Torvalds #define ACPI_PROCESSOR_CLASS "processor" 631da177e4SLinus Torvalds #define _COMPONENT ACPI_PROCESSOR_COMPONENT 64f52fd66dSLen Brown ACPI_MODULE_NAME("processor_idle"); 651da177e4SLinus Torvalds #define ACPI_PROCESSOR_FILE_POWER "power" 661da177e4SLinus Torvalds #define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) 672aa44d05SIngo Molnar #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) 684f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 691da177e4SLinus Torvalds #define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */ 701da177e4SLinus Torvalds #define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */ 71b6835052SAndreas Mohr static void (*pm_idle_save) (void) __read_mostly; 724f86d3a8SLen Brown #else 734f86d3a8SLen Brown #define C2_OVERHEAD 1 /* 1us */ 744f86d3a8SLen Brown #define C3_OVERHEAD 1 /* 1us */ 754f86d3a8SLen Brown #endif 764f86d3a8SLen Brown #define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) 771da177e4SLinus Torvalds 784f86d3a8SLen Brown static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; 794f86d3a8SLen Brown module_param(max_cstate, uint, 0000); 80b6835052SAndreas Mohr static unsigned int nocst __read_mostly; 811da177e4SLinus Torvalds module_param(nocst, uint, 0000); 821da177e4SLinus Torvalds 834f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 841da177e4SLinus Torvalds /* 851da177e4SLinus Torvalds * bm_history -- bit-mask with a bit per jiffy of bus-master activity 861da177e4SLinus Torvalds * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms 871da177e4SLinus Torvalds * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms 881da177e4SLinus Torvalds * 100 HZ: 0x0000000F: 4 jiffies = 40ms 891da177e4SLinus Torvalds * reduce history for more aggressive entry into C3 901da177e4SLinus Torvalds */ 91b6835052SAndreas Mohr static unsigned int bm_history __read_mostly = 924be44fcdSLen Brown (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1)); 931da177e4SLinus Torvalds module_param(bm_history, uint, 0644); 944f86d3a8SLen Brown 954f86d3a8SLen Brown static int acpi_processor_set_power_policy(struct acpi_processor *pr); 964f86d3a8SLen Brown 974f86d3a8SLen Brown #endif 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* 1001da177e4SLinus Torvalds * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. 1011da177e4SLinus Torvalds * For now disable this. Probably a bug somewhere else. 1021da177e4SLinus Torvalds * 1031da177e4SLinus Torvalds * To skip this limit, boot/load with a large max_cstate limit. 1041da177e4SLinus Torvalds */ 105335f16beSDavid Shaohua Li static int set_max_cstate(struct dmi_system_id *id) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds if (max_cstate > ACPI_PROCESSOR_MAX_POWER) 1081da177e4SLinus Torvalds return 0; 1091da177e4SLinus Torvalds 1103d35600aSLen Brown printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." 1111da177e4SLinus Torvalds " Override with \"processor.max_cstate=%d\"\n", id->ident, 1123d35600aSLen Brown (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); 1131da177e4SLinus Torvalds 1143d35600aSLen Brown max_cstate = (long)id->driver_data; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds return 0; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1197ded5689SAshok Raj /* Actually this shouldn't be __cpuinitdata, would be better to fix the 1207ded5689SAshok Raj callers to only run once -AK */ 1217ded5689SAshok Raj static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { 122335f16beSDavid Shaohua Li { set_max_cstate, "IBM ThinkPad R40e", { 123876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 124f831335dSBartlomiej Swiercz DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1}, 125f831335dSBartlomiej Swiercz { set_max_cstate, "IBM ThinkPad R40e", { 126f831335dSBartlomiej Swiercz DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 127876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1}, 128876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 129876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 130876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1}, 131876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 132876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 133876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1}, 134876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 135876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 136876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1}, 137876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 138876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 139876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1}, 140876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 141876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 142876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1}, 143876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 144876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 145876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1}, 146876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 147876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 148876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1}, 149876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 150876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 151876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1}, 152876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 153876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 154876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1}, 155876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 156876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 157876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1}, 158876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 159876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 160876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1}, 161876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 162876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 163876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1}, 164876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 165876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 166876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1}, 167876c184bSThomas Rosner { set_max_cstate, "IBM ThinkPad R40e", { 168876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), 169876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, 170335f16beSDavid Shaohua Li { set_max_cstate, "Medion 41700", { 171876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), 172876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, 173335f16beSDavid Shaohua Li { set_max_cstate, "Clevo 5600D", { 174876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), 175876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, 176335f16beSDavid Shaohua Li (void *)2}, 1771da177e4SLinus Torvalds {}, 1781da177e4SLinus Torvalds }; 1791da177e4SLinus Torvalds 1804be44fcdSLen Brown static inline u32 ticks_elapsed(u32 t1, u32 t2) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds if (t2 >= t1) 1831da177e4SLinus Torvalds return (t2 - t1); 184cee324b1SAlexey Starikovskiy else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) 1851da177e4SLinus Torvalds return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); 1861da177e4SLinus Torvalds else 1871da177e4SLinus Torvalds return ((0xFFFFFFFF - t1) + t2); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1904f86d3a8SLen Brown static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2) 1914f86d3a8SLen Brown { 1924f86d3a8SLen Brown if (t2 >= t1) 1934f86d3a8SLen Brown return PM_TIMER_TICKS_TO_US(t2 - t1); 1944f86d3a8SLen Brown else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER)) 1954f86d3a8SLen Brown return PM_TIMER_TICKS_TO_US(((0x00FFFFFF - t1) + t2) & 0x00FFFFFF); 1964f86d3a8SLen Brown else 1974f86d3a8SLen Brown return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2); 1984f86d3a8SLen Brown } 1994f86d3a8SLen Brown 2004f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 2014f86d3a8SLen Brown 2021da177e4SLinus Torvalds static void 2034be44fcdSLen Brown acpi_processor_power_activate(struct acpi_processor *pr, 2041da177e4SLinus Torvalds struct acpi_processor_cx *new) 2051da177e4SLinus Torvalds { 2061da177e4SLinus Torvalds struct acpi_processor_cx *old; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds if (!pr || !new) 2091da177e4SLinus Torvalds return; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds old = pr->power.state; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds if (old) 2141da177e4SLinus Torvalds old->promotion.count = 0; 2151da177e4SLinus Torvalds new->demotion.count = 0; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds /* Cleanup from old state. */ 2181da177e4SLinus Torvalds if (old) { 2191da177e4SLinus Torvalds switch (old->type) { 2201da177e4SLinus Torvalds case ACPI_STATE_C3: 2211da177e4SLinus Torvalds /* Disable bus master reload */ 22202df8b93SVenkatesh Pallipadi if (new->type != ACPI_STATE_C3 && pr->flags.bm_check) 223d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); 2241da177e4SLinus Torvalds break; 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* Prepare to use new state. */ 2291da177e4SLinus Torvalds switch (new->type) { 2301da177e4SLinus Torvalds case ACPI_STATE_C3: 2311da177e4SLinus Torvalds /* Enable bus master reload */ 23202df8b93SVenkatesh Pallipadi if (old->type != ACPI_STATE_C3 && pr->flags.bm_check) 233d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); 2341da177e4SLinus Torvalds break; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds pr->power.state = new; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds return; 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds 24264c7c8f8SNick Piggin static void acpi_safe_halt(void) 24364c7c8f8SNick Piggin { 244495ab9c0SAndi Kleen current_thread_info()->status &= ~TS_POLLING; 2450888f06aSIngo Molnar /* 2460888f06aSIngo Molnar * TS_POLLING-cleared state must be visible before we 2470888f06aSIngo Molnar * test NEED_RESCHED: 2480888f06aSIngo Molnar */ 2490888f06aSIngo Molnar smp_mb(); 25064c7c8f8SNick Piggin if (!need_resched()) 25164c7c8f8SNick Piggin safe_halt(); 252495ab9c0SAndi Kleen current_thread_info()->status |= TS_POLLING; 25364c7c8f8SNick Piggin } 25464c7c8f8SNick Piggin 25502df8b93SVenkatesh Pallipadi static atomic_t c3_cpu_count; 25602df8b93SVenkatesh Pallipadi 257991528d7SVenkatesh Pallipadi /* Common C-state entry for C2, C3, .. */ 258991528d7SVenkatesh Pallipadi static void acpi_cstate_enter(struct acpi_processor_cx *cstate) 259991528d7SVenkatesh Pallipadi { 260991528d7SVenkatesh Pallipadi if (cstate->space_id == ACPI_CSTATE_FFH) { 261991528d7SVenkatesh Pallipadi /* Call into architectural FFH based C-state */ 262991528d7SVenkatesh Pallipadi acpi_processor_ffh_cstate_enter(cstate); 263991528d7SVenkatesh Pallipadi } else { 264991528d7SVenkatesh Pallipadi int unused; 265991528d7SVenkatesh Pallipadi /* IO port based C-state */ 266991528d7SVenkatesh Pallipadi inb(cstate->address); 267991528d7SVenkatesh Pallipadi /* Dummy wait op - must do something useless after P_LVL2 read 268991528d7SVenkatesh Pallipadi because chipsets cannot guarantee that STPCLK# signal 269991528d7SVenkatesh Pallipadi gets asserted in time to freeze execution properly. */ 270cee324b1SAlexey Starikovskiy unused = inl(acpi_gbl_FADT.xpm_timer_block.address); 271991528d7SVenkatesh Pallipadi } 272991528d7SVenkatesh Pallipadi } 2734f86d3a8SLen Brown #endif /* !CONFIG_CPU_IDLE */ 274991528d7SVenkatesh Pallipadi 275169a0abbSThomas Gleixner #ifdef ARCH_APICTIMER_STOPS_ON_C3 276169a0abbSThomas Gleixner 277169a0abbSThomas Gleixner /* 278169a0abbSThomas Gleixner * Some BIOS implementations switch to C3 in the published C2 state. 279296d93cdSLinus Torvalds * This seems to be a common problem on AMD boxen, but other vendors 280296d93cdSLinus Torvalds * are affected too. We pick the most conservative approach: we assume 281296d93cdSLinus Torvalds * that the local APIC stops in both C2 and C3. 282169a0abbSThomas Gleixner */ 283169a0abbSThomas Gleixner static void acpi_timer_check_state(int state, struct acpi_processor *pr, 284169a0abbSThomas Gleixner struct acpi_processor_cx *cx) 285169a0abbSThomas Gleixner { 286169a0abbSThomas Gleixner struct acpi_processor_power *pwr = &pr->power; 287e585bef8SThomas Gleixner u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; 288169a0abbSThomas Gleixner 289169a0abbSThomas Gleixner /* 290169a0abbSThomas Gleixner * Check, if one of the previous states already marked the lapic 291169a0abbSThomas Gleixner * unstable 292169a0abbSThomas Gleixner */ 293169a0abbSThomas Gleixner if (pwr->timer_broadcast_on_state < state) 294169a0abbSThomas Gleixner return; 295169a0abbSThomas Gleixner 296e585bef8SThomas Gleixner if (cx->type >= type) 297169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = state; 298169a0abbSThomas Gleixner } 299169a0abbSThomas Gleixner 300169a0abbSThomas Gleixner static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) 301169a0abbSThomas Gleixner { 302e9e2cdb4SThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS 303e9e2cdb4SThomas Gleixner unsigned long reason; 304e9e2cdb4SThomas Gleixner 305e9e2cdb4SThomas Gleixner reason = pr->power.timer_broadcast_on_state < INT_MAX ? 306e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; 307e9e2cdb4SThomas Gleixner 308e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 309e9e2cdb4SThomas Gleixner #else 310169a0abbSThomas Gleixner cpumask_t mask = cpumask_of_cpu(pr->id); 311169a0abbSThomas Gleixner 312169a0abbSThomas Gleixner if (pr->power.timer_broadcast_on_state < INT_MAX) 313169a0abbSThomas Gleixner on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1); 314169a0abbSThomas Gleixner else 315169a0abbSThomas Gleixner on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1); 316e9e2cdb4SThomas Gleixner #endif 317e9e2cdb4SThomas Gleixner } 318e9e2cdb4SThomas Gleixner 319e9e2cdb4SThomas Gleixner /* Power(C) State timer broadcast control */ 320e9e2cdb4SThomas Gleixner static void acpi_state_timer_broadcast(struct acpi_processor *pr, 321e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 322e9e2cdb4SThomas Gleixner int broadcast) 323e9e2cdb4SThomas Gleixner { 324e9e2cdb4SThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS 325e9e2cdb4SThomas Gleixner 326e9e2cdb4SThomas Gleixner int state = cx - pr->power.states; 327e9e2cdb4SThomas Gleixner 328e9e2cdb4SThomas Gleixner if (state >= pr->power.timer_broadcast_on_state) { 329e9e2cdb4SThomas Gleixner unsigned long reason; 330e9e2cdb4SThomas Gleixner 331e9e2cdb4SThomas Gleixner reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : 332e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_EXIT; 333e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 334e9e2cdb4SThomas Gleixner } 335e9e2cdb4SThomas Gleixner #endif 336169a0abbSThomas Gleixner } 337169a0abbSThomas Gleixner 338169a0abbSThomas Gleixner #else 339169a0abbSThomas Gleixner 340169a0abbSThomas Gleixner static void acpi_timer_check_state(int state, struct acpi_processor *pr, 341169a0abbSThomas Gleixner struct acpi_processor_cx *cstate) { } 342169a0abbSThomas Gleixner static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } 343e9e2cdb4SThomas Gleixner static void acpi_state_timer_broadcast(struct acpi_processor *pr, 344e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 345e9e2cdb4SThomas Gleixner int broadcast) 346e9e2cdb4SThomas Gleixner { 347e9e2cdb4SThomas Gleixner } 348169a0abbSThomas Gleixner 349169a0abbSThomas Gleixner #endif 350169a0abbSThomas Gleixner 351b04e7bdbSThomas Gleixner /* 352b04e7bdbSThomas Gleixner * Suspend / resume control 353b04e7bdbSThomas Gleixner */ 354b04e7bdbSThomas Gleixner static int acpi_idle_suspend; 355b04e7bdbSThomas Gleixner 356b04e7bdbSThomas Gleixner int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) 357b04e7bdbSThomas Gleixner { 358b04e7bdbSThomas Gleixner acpi_idle_suspend = 1; 359b04e7bdbSThomas Gleixner return 0; 360b04e7bdbSThomas Gleixner } 361b04e7bdbSThomas Gleixner 362b04e7bdbSThomas Gleixner int acpi_processor_resume(struct acpi_device * device) 363b04e7bdbSThomas Gleixner { 364b04e7bdbSThomas Gleixner acpi_idle_suspend = 0; 365b04e7bdbSThomas Gleixner return 0; 366b04e7bdbSThomas Gleixner } 367b04e7bdbSThomas Gleixner 3684f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 3691da177e4SLinus Torvalds static void acpi_processor_idle(void) 3701da177e4SLinus Torvalds { 3711da177e4SLinus Torvalds struct acpi_processor *pr = NULL; 3721da177e4SLinus Torvalds struct acpi_processor_cx *cx = NULL; 3731da177e4SLinus Torvalds struct acpi_processor_cx *next_state = NULL; 3741da177e4SLinus Torvalds int sleep_ticks = 0; 3751da177e4SLinus Torvalds u32 t1, t2 = 0; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* 3781da177e4SLinus Torvalds * Interrupts must be disabled during bus mastering calculations and 3791da177e4SLinus Torvalds * for C2/C3 transitions. 3801da177e4SLinus Torvalds */ 3811da177e4SLinus Torvalds local_irq_disable(); 3821da177e4SLinus Torvalds 383d5a3d32aSVenkatesh Pallipadi pr = processors[smp_processor_id()]; 384d5a3d32aSVenkatesh Pallipadi if (!pr) { 385d5a3d32aSVenkatesh Pallipadi local_irq_enable(); 386d5a3d32aSVenkatesh Pallipadi return; 387d5a3d32aSVenkatesh Pallipadi } 388d5a3d32aSVenkatesh Pallipadi 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * Check whether we truly need to go idle, or should 3911da177e4SLinus Torvalds * reschedule: 3921da177e4SLinus Torvalds */ 3931da177e4SLinus Torvalds if (unlikely(need_resched())) { 3941da177e4SLinus Torvalds local_irq_enable(); 3951da177e4SLinus Torvalds return; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds cx = pr->power.state; 399b04e7bdbSThomas Gleixner if (!cx || acpi_idle_suspend) { 40064c7c8f8SNick Piggin if (pm_idle_save) 40164c7c8f8SNick Piggin pm_idle_save(); 40264c7c8f8SNick Piggin else 40364c7c8f8SNick Piggin acpi_safe_halt(); 40464c7c8f8SNick Piggin return; 40564c7c8f8SNick Piggin } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* 4081da177e4SLinus Torvalds * Check BM Activity 4091da177e4SLinus Torvalds * ----------------- 4101da177e4SLinus Torvalds * Check for bus mastering activity (if required), record, and check 4111da177e4SLinus Torvalds * for demotion. 4121da177e4SLinus Torvalds */ 4131da177e4SLinus Torvalds if (pr->flags.bm_check) { 4141da177e4SLinus Torvalds u32 bm_status = 0; 4151da177e4SLinus Torvalds unsigned long diff = jiffies - pr->power.bm_check_timestamp; 4161da177e4SLinus Torvalds 417c5ab81caSDominik Brodowski if (diff > 31) 418c5ab81caSDominik Brodowski diff = 31; 4191da177e4SLinus Torvalds 420c5ab81caSDominik Brodowski pr->power.bm_activity <<= diff; 4211da177e4SLinus Torvalds 422d8c71b6dSBob Moore acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); 4231da177e4SLinus Torvalds if (bm_status) { 424c5ab81caSDominik Brodowski pr->power.bm_activity |= 0x1; 425d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect 4291da177e4SLinus Torvalds * the true state of bus mastering activity; forcing us to 4301da177e4SLinus Torvalds * manually check the BMIDEA bit of each IDE channel. 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds else if (errata.piix4.bmisx) { 4331da177e4SLinus Torvalds if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) 4341da177e4SLinus Torvalds || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) 435c5ab81caSDominik Brodowski pr->power.bm_activity |= 0x1; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds pr->power.bm_check_timestamp = jiffies; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 441c4a001b1SDominik Brodowski * If bus mastering is or was active this jiffy, demote 4421da177e4SLinus Torvalds * to avoid a faulty transition. Note that the processor 4431da177e4SLinus Torvalds * won't enter a low-power state during this call (to this 444c4a001b1SDominik Brodowski * function) but should upon the next. 4451da177e4SLinus Torvalds * 4461da177e4SLinus Torvalds * TBD: A better policy might be to fallback to the demotion 4471da177e4SLinus Torvalds * state (use it for this quantum only) istead of 4481da177e4SLinus Torvalds * demoting -- and rely on duration as our sole demotion 4491da177e4SLinus Torvalds * qualification. This may, however, introduce DMA 4501da177e4SLinus Torvalds * issues (e.g. floppy DMA transfer overrun/underrun). 4511da177e4SLinus Torvalds */ 452c4a001b1SDominik Brodowski if ((pr->power.bm_activity & 0x1) && 453c4a001b1SDominik Brodowski cx->demotion.threshold.bm) { 4541da177e4SLinus Torvalds local_irq_enable(); 4551da177e4SLinus Torvalds next_state = cx->demotion.state; 4561da177e4SLinus Torvalds goto end; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4604c033552SVenkatesh Pallipadi #ifdef CONFIG_HOTPLUG_CPU 4614c033552SVenkatesh Pallipadi /* 4624c033552SVenkatesh Pallipadi * Check for P_LVL2_UP flag before entering C2 and above on 4634c033552SVenkatesh Pallipadi * an SMP system. We do it here instead of doing it at _CST/P_LVL 4644c033552SVenkatesh Pallipadi * detection phase, to work cleanly with logical CPU hotplug. 4654c033552SVenkatesh Pallipadi */ 4664c033552SVenkatesh Pallipadi if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 467cee324b1SAlexey Starikovskiy !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 4681e483969SDavid Shaohua Li cx = &pr->power.states[ACPI_STATE_C1]; 4694c033552SVenkatesh Pallipadi #endif 4701e483969SDavid Shaohua Li 4711da177e4SLinus Torvalds /* 4721da177e4SLinus Torvalds * Sleep: 4731da177e4SLinus Torvalds * ------ 4741da177e4SLinus Torvalds * Invoke the current Cx state to put the processor to sleep. 4751da177e4SLinus Torvalds */ 4762a298a35SNick Piggin if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) { 477495ab9c0SAndi Kleen current_thread_info()->status &= ~TS_POLLING; 4780888f06aSIngo Molnar /* 4790888f06aSIngo Molnar * TS_POLLING-cleared state must be visible before we 4800888f06aSIngo Molnar * test NEED_RESCHED: 4810888f06aSIngo Molnar */ 4820888f06aSIngo Molnar smp_mb(); 4832a298a35SNick Piggin if (need_resched()) { 484495ab9c0SAndi Kleen current_thread_info()->status |= TS_POLLING; 485af2eb17bSLinus Torvalds local_irq_enable(); 4862a298a35SNick Piggin return; 4872a298a35SNick Piggin } 4882a298a35SNick Piggin } 4892a298a35SNick Piggin 4901da177e4SLinus Torvalds switch (cx->type) { 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds case ACPI_STATE_C1: 4931da177e4SLinus Torvalds /* 4941da177e4SLinus Torvalds * Invoke C1. 4951da177e4SLinus Torvalds * Use the appropriate idle routine, the one that would 4961da177e4SLinus Torvalds * be used without acpi C-states. 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds if (pm_idle_save) 4991da177e4SLinus Torvalds pm_idle_save(); 5001da177e4SLinus Torvalds else 50164c7c8f8SNick Piggin acpi_safe_halt(); 50264c7c8f8SNick Piggin 5031da177e4SLinus Torvalds /* 5041da177e4SLinus Torvalds * TBD: Can't get time duration while in C1, as resumes 5051da177e4SLinus Torvalds * go to an ISR rather than here. Need to instrument 5061da177e4SLinus Torvalds * base interrupt handler. 5072aa44d05SIngo Molnar * 5082aa44d05SIngo Molnar * Note: the TSC better not stop in C1, sched_clock() will 5092aa44d05SIngo Molnar * skew otherwise. 5101da177e4SLinus Torvalds */ 5111da177e4SLinus Torvalds sleep_ticks = 0xFFFFFFFF; 5121da177e4SLinus Torvalds break; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds case ACPI_STATE_C2: 5151da177e4SLinus Torvalds /* Get start time (ticks) */ 516cee324b1SAlexey Starikovskiy t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); 5172aa44d05SIngo Molnar /* Tell the scheduler that we are going deep-idle: */ 5182aa44d05SIngo Molnar sched_clock_idle_sleep_event(); 5191da177e4SLinus Torvalds /* Invoke C2 */ 520e9e2cdb4SThomas Gleixner acpi_state_timer_broadcast(pr, cx, 1); 521991528d7SVenkatesh Pallipadi acpi_cstate_enter(cx); 5221da177e4SLinus Torvalds /* Get end time (ticks) */ 523cee324b1SAlexey Starikovskiy t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); 524539eb11eSjohn stultz 5250aa366f3STony Luck #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) 526539eb11eSjohn stultz /* TSC halts in C2, so notify users */ 5275a90cf20Sjohn stultz mark_tsc_unstable("possible TSC halt in C2"); 528539eb11eSjohn stultz #endif 5292aa44d05SIngo Molnar /* Compute time (ticks) that we were actually asleep */ 5302aa44d05SIngo Molnar sleep_ticks = ticks_elapsed(t1, t2); 5312aa44d05SIngo Molnar 5322aa44d05SIngo Molnar /* Tell the scheduler how much we idled: */ 5332aa44d05SIngo Molnar sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); 5342aa44d05SIngo Molnar 5351da177e4SLinus Torvalds /* Re-enable interrupts */ 5361da177e4SLinus Torvalds local_irq_enable(); 5372aa44d05SIngo Molnar /* Do not account our idle-switching overhead: */ 5382aa44d05SIngo Molnar sleep_ticks -= cx->latency_ticks + C2_OVERHEAD; 5392aa44d05SIngo Molnar 540495ab9c0SAndi Kleen current_thread_info()->status |= TS_POLLING; 541e9e2cdb4SThomas Gleixner acpi_state_timer_broadcast(pr, cx, 0); 5421da177e4SLinus Torvalds break; 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds case ACPI_STATE_C3: 54518eab855SVenkatesh Pallipadi /* 54618eab855SVenkatesh Pallipadi * disable bus master 54718eab855SVenkatesh Pallipadi * bm_check implies we need ARB_DIS 54818eab855SVenkatesh Pallipadi * !bm_check implies we need cache flush 54918eab855SVenkatesh Pallipadi * bm_control implies whether we can do ARB_DIS 55018eab855SVenkatesh Pallipadi * 55118eab855SVenkatesh Pallipadi * That leaves a case where bm_check is set and bm_control is 55218eab855SVenkatesh Pallipadi * not set. In that case we cannot do much, we enter C3 55318eab855SVenkatesh Pallipadi * without doing anything. 55418eab855SVenkatesh Pallipadi */ 55518eab855SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 55602df8b93SVenkatesh Pallipadi if (atomic_inc_return(&c3_cpu_count) == 55702df8b93SVenkatesh Pallipadi num_online_cpus()) { 55802df8b93SVenkatesh Pallipadi /* 55902df8b93SVenkatesh Pallipadi * All CPUs are trying to go to C3 56002df8b93SVenkatesh Pallipadi * Disable bus master arbitration 56102df8b93SVenkatesh Pallipadi */ 562d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); 56302df8b93SVenkatesh Pallipadi } 56418eab855SVenkatesh Pallipadi } else if (!pr->flags.bm_check) { 56502df8b93SVenkatesh Pallipadi /* SMP with no shared cache... Invalidate cache */ 56602df8b93SVenkatesh Pallipadi ACPI_FLUSH_CPU_CACHE(); 56702df8b93SVenkatesh Pallipadi } 56802df8b93SVenkatesh Pallipadi 5691da177e4SLinus Torvalds /* Get start time (ticks) */ 570cee324b1SAlexey Starikovskiy t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); 5711da177e4SLinus Torvalds /* Invoke C3 */ 572e9e2cdb4SThomas Gleixner acpi_state_timer_broadcast(pr, cx, 1); 5732aa44d05SIngo Molnar /* Tell the scheduler that we are going deep-idle: */ 5742aa44d05SIngo Molnar sched_clock_idle_sleep_event(); 575991528d7SVenkatesh Pallipadi acpi_cstate_enter(cx); 5761da177e4SLinus Torvalds /* Get end time (ticks) */ 577cee324b1SAlexey Starikovskiy t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); 57818eab855SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 5791da177e4SLinus Torvalds /* Enable bus master arbitration */ 58002df8b93SVenkatesh Pallipadi atomic_dec(&c3_cpu_count); 581d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); 58202df8b93SVenkatesh Pallipadi } 58302df8b93SVenkatesh Pallipadi 5840aa366f3STony Luck #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) 585539eb11eSjohn stultz /* TSC halts in C3, so notify users */ 5865a90cf20Sjohn stultz mark_tsc_unstable("TSC halts in C3"); 587539eb11eSjohn stultz #endif 5882aa44d05SIngo Molnar /* Compute time (ticks) that we were actually asleep */ 5892aa44d05SIngo Molnar sleep_ticks = ticks_elapsed(t1, t2); 5902aa44d05SIngo Molnar /* Tell the scheduler how much we idled: */ 5912aa44d05SIngo Molnar sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); 5922aa44d05SIngo Molnar 5931da177e4SLinus Torvalds /* Re-enable interrupts */ 5941da177e4SLinus Torvalds local_irq_enable(); 5952aa44d05SIngo Molnar /* Do not account our idle-switching overhead: */ 5962aa44d05SIngo Molnar sleep_ticks -= cx->latency_ticks + C3_OVERHEAD; 5972aa44d05SIngo Molnar 598495ab9c0SAndi Kleen current_thread_info()->status |= TS_POLLING; 599e9e2cdb4SThomas Gleixner acpi_state_timer_broadcast(pr, cx, 0); 6001da177e4SLinus Torvalds break; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds default: 6031da177e4SLinus Torvalds local_irq_enable(); 6041da177e4SLinus Torvalds return; 6051da177e4SLinus Torvalds } 606a3c6598fSDominik Brodowski cx->usage++; 607a3c6598fSDominik Brodowski if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0)) 608a3c6598fSDominik Brodowski cx->time += sleep_ticks; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds next_state = pr->power.state; 6111da177e4SLinus Torvalds 6121e483969SDavid Shaohua Li #ifdef CONFIG_HOTPLUG_CPU 6131e483969SDavid Shaohua Li /* Don't do promotion/demotion */ 6141e483969SDavid Shaohua Li if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) && 615cee324b1SAlexey Starikovskiy !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) { 6161e483969SDavid Shaohua Li next_state = cx; 6171e483969SDavid Shaohua Li goto end; 6181e483969SDavid Shaohua Li } 6191e483969SDavid Shaohua Li #endif 6201e483969SDavid Shaohua Li 6211da177e4SLinus Torvalds /* 6221da177e4SLinus Torvalds * Promotion? 6231da177e4SLinus Torvalds * ---------- 6241da177e4SLinus Torvalds * Track the number of longs (time asleep is greater than threshold) 6251da177e4SLinus Torvalds * and promote when the count threshold is reached. Note that bus 6261da177e4SLinus Torvalds * mastering activity may prevent promotions. 6271da177e4SLinus Torvalds * Do not promote above max_cstate. 6281da177e4SLinus Torvalds */ 6291da177e4SLinus Torvalds if (cx->promotion.state && 6301da177e4SLinus Torvalds ((cx->promotion.state - pr->power.states) <= max_cstate)) { 6315c87579eSArjan van de Ven if (sleep_ticks > cx->promotion.threshold.ticks && 6325c87579eSArjan van de Ven cx->promotion.state->latency <= system_latency_constraint()) { 6331da177e4SLinus Torvalds cx->promotion.count++; 6341da177e4SLinus Torvalds cx->demotion.count = 0; 6354be44fcdSLen Brown if (cx->promotion.count >= 6364be44fcdSLen Brown cx->promotion.threshold.count) { 6371da177e4SLinus Torvalds if (pr->flags.bm_check) { 6384be44fcdSLen Brown if (! 6394be44fcdSLen Brown (pr->power.bm_activity & cx-> 6404be44fcdSLen Brown promotion.threshold.bm)) { 6414be44fcdSLen Brown next_state = 6424be44fcdSLen Brown cx->promotion.state; 6431da177e4SLinus Torvalds goto end; 6441da177e4SLinus Torvalds } 6454be44fcdSLen Brown } else { 6461da177e4SLinus Torvalds next_state = cx->promotion.state; 6471da177e4SLinus Torvalds goto end; 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds /* 6541da177e4SLinus Torvalds * Demotion? 6551da177e4SLinus Torvalds * --------- 6561da177e4SLinus Torvalds * Track the number of shorts (time asleep is less than time threshold) 6571da177e4SLinus Torvalds * and demote when the usage threshold is reached. 6581da177e4SLinus Torvalds */ 6591da177e4SLinus Torvalds if (cx->demotion.state) { 6601da177e4SLinus Torvalds if (sleep_ticks < cx->demotion.threshold.ticks) { 6611da177e4SLinus Torvalds cx->demotion.count++; 6621da177e4SLinus Torvalds cx->promotion.count = 0; 6631da177e4SLinus Torvalds if (cx->demotion.count >= cx->demotion.threshold.count) { 6641da177e4SLinus Torvalds next_state = cx->demotion.state; 6651da177e4SLinus Torvalds goto end; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds end: 6711da177e4SLinus Torvalds /* 6721da177e4SLinus Torvalds * Demote if current state exceeds max_cstate 6735c87579eSArjan van de Ven * or if the latency of the current state is unacceptable 6741da177e4SLinus Torvalds */ 6755c87579eSArjan van de Ven if ((pr->power.state - pr->power.states) > max_cstate || 6765c87579eSArjan van de Ven pr->power.state->latency > system_latency_constraint()) { 6771da177e4SLinus Torvalds if (cx->demotion.state) 6781da177e4SLinus Torvalds next_state = cx->demotion.state; 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* 6821da177e4SLinus Torvalds * New Cx State? 6831da177e4SLinus Torvalds * ------------- 6841da177e4SLinus Torvalds * If we're going to start using a new Cx state we must clean up 6851da177e4SLinus Torvalds * from the previous and prepare to use the new. 6861da177e4SLinus Torvalds */ 6871da177e4SLinus Torvalds if (next_state != pr->power.state) 6881da177e4SLinus Torvalds acpi_processor_power_activate(pr, next_state); 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6914be44fcdSLen Brown static int acpi_processor_set_power_policy(struct acpi_processor *pr) 6921da177e4SLinus Torvalds { 6931da177e4SLinus Torvalds unsigned int i; 6941da177e4SLinus Torvalds unsigned int state_is_set = 0; 6951da177e4SLinus Torvalds struct acpi_processor_cx *lower = NULL; 6961da177e4SLinus Torvalds struct acpi_processor_cx *higher = NULL; 6971da177e4SLinus Torvalds struct acpi_processor_cx *cx; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds if (!pr) 701d550d98dSPatrick Mochel return -EINVAL; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* 7041da177e4SLinus Torvalds * This function sets the default Cx state policy (OS idle handler). 7051da177e4SLinus Torvalds * Our scheme is to promote quickly to C2 but more conservatively 7061da177e4SLinus Torvalds * to C3. We're favoring C2 for its characteristics of low latency 7071da177e4SLinus Torvalds * (quick response), good power savings, and ability to allow bus 7081da177e4SLinus Torvalds * mastering activity. Note that the Cx state policy is completely 7091da177e4SLinus Torvalds * customizable and can be altered dynamically. 7101da177e4SLinus Torvalds */ 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* startup state */ 7131da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 7141da177e4SLinus Torvalds cx = &pr->power.states[i]; 7151da177e4SLinus Torvalds if (!cx->valid) 7161da177e4SLinus Torvalds continue; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds if (!state_is_set) 7191da177e4SLinus Torvalds pr->power.state = cx; 7201da177e4SLinus Torvalds state_is_set++; 7211da177e4SLinus Torvalds break; 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds if (!state_is_set) 725d550d98dSPatrick Mochel return -ENODEV; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* demotion */ 7281da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 7291da177e4SLinus Torvalds cx = &pr->power.states[i]; 7301da177e4SLinus Torvalds if (!cx->valid) 7311da177e4SLinus Torvalds continue; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds if (lower) { 7341da177e4SLinus Torvalds cx->demotion.state = lower; 7351da177e4SLinus Torvalds cx->demotion.threshold.ticks = cx->latency_ticks; 7361da177e4SLinus Torvalds cx->demotion.threshold.count = 1; 7371da177e4SLinus Torvalds if (cx->type == ACPI_STATE_C3) 7381da177e4SLinus Torvalds cx->demotion.threshold.bm = bm_history; 7391da177e4SLinus Torvalds } 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds lower = cx; 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /* promotion */ 7451da177e4SLinus Torvalds for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) { 7461da177e4SLinus Torvalds cx = &pr->power.states[i]; 7471da177e4SLinus Torvalds if (!cx->valid) 7481da177e4SLinus Torvalds continue; 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds if (higher) { 7511da177e4SLinus Torvalds cx->promotion.state = higher; 7521da177e4SLinus Torvalds cx->promotion.threshold.ticks = cx->latency_ticks; 7531da177e4SLinus Torvalds if (cx->type >= ACPI_STATE_C2) 7541da177e4SLinus Torvalds cx->promotion.threshold.count = 4; 7551da177e4SLinus Torvalds else 7561da177e4SLinus Torvalds cx->promotion.threshold.count = 10; 7571da177e4SLinus Torvalds if (higher->type == ACPI_STATE_C3) 7581da177e4SLinus Torvalds cx->promotion.threshold.bm = bm_history; 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds higher = cx; 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds 764d550d98dSPatrick Mochel return 0; 7651da177e4SLinus Torvalds } 7664f86d3a8SLen Brown #endif /* !CONFIG_CPU_IDLE */ 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) 7691da177e4SLinus Torvalds { 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds if (!pr) 772d550d98dSPatrick Mochel return -EINVAL; 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds if (!pr->pblk) 775d550d98dSPatrick Mochel return -ENODEV; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* if info is obtained from pblk/fadt, type equals state */ 7781da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; 7791da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; 7801da177e4SLinus Torvalds 7814c033552SVenkatesh Pallipadi #ifndef CONFIG_HOTPLUG_CPU 7824c033552SVenkatesh Pallipadi /* 7834c033552SVenkatesh Pallipadi * Check for P_LVL2_UP flag before entering C2 and above on 7844c033552SVenkatesh Pallipadi * an SMP system. 7854c033552SVenkatesh Pallipadi */ 786ad71860aSAlexey Starikovskiy if ((num_online_cpus() > 1) && 787cee324b1SAlexey Starikovskiy !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 788d550d98dSPatrick Mochel return -ENODEV; 7894c033552SVenkatesh Pallipadi #endif 7904c033552SVenkatesh Pallipadi 7911da177e4SLinus Torvalds /* determine C2 and C3 address from pblk */ 7921da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; 7931da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds /* determine latencies from FADT */ 796cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; 797cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 8001da177e4SLinus Torvalds "lvl2[0x%08x] lvl3[0x%08x]\n", 8011da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address, 8021da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address)); 8031da177e4SLinus Torvalds 804d550d98dSPatrick Mochel return 0; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds 807991528d7SVenkatesh Pallipadi static int acpi_processor_get_power_info_default(struct acpi_processor *pr) 808acf05f4bSVenkatesh Pallipadi { 809991528d7SVenkatesh Pallipadi if (!pr->power.states[ACPI_STATE_C1].valid) { 810cf824788SJanosch Machowinski /* set the first C-State to C1 */ 811991528d7SVenkatesh Pallipadi /* all processors need to support C1 */ 812acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; 813acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].valid = 1; 814991528d7SVenkatesh Pallipadi } 815991528d7SVenkatesh Pallipadi /* the C0 state only exists as a filler in our array */ 816991528d7SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C0].valid = 1; 817d550d98dSPatrick Mochel return 0; 818acf05f4bSVenkatesh Pallipadi } 819acf05f4bSVenkatesh Pallipadi 8201da177e4SLinus Torvalds static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) 8211da177e4SLinus Torvalds { 8221da177e4SLinus Torvalds acpi_status status = 0; 8231da177e4SLinus Torvalds acpi_integer count; 824cf824788SJanosch Machowinski int current_count; 8251da177e4SLinus Torvalds int i; 8261da177e4SLinus Torvalds struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 8271da177e4SLinus Torvalds union acpi_object *cst; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds if (nocst) 831d550d98dSPatrick Mochel return -ENODEV; 8321da177e4SLinus Torvalds 833991528d7SVenkatesh Pallipadi current_count = 0; 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); 8361da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 8371da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); 838d550d98dSPatrick Mochel return -ENODEV; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 84150dd0969SJan Engelhardt cst = buffer.pointer; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds /* There must be at least 2 elements */ 8441da177e4SLinus Torvalds if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { 8456468463aSLen Brown printk(KERN_ERR PREFIX "not enough elements in _CST\n"); 8461da177e4SLinus Torvalds status = -EFAULT; 8471da177e4SLinus Torvalds goto end; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds count = cst->package.elements[0].integer.value; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* Validate number of power states. */ 8531da177e4SLinus Torvalds if (count < 1 || count != cst->package.count - 1) { 8546468463aSLen Brown printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); 8551da177e4SLinus Torvalds status = -EFAULT; 8561da177e4SLinus Torvalds goto end; 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds /* Tell driver that at least _CST is supported. */ 8601da177e4SLinus Torvalds pr->flags.has_cst = 1; 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds for (i = 1; i <= count; i++) { 8631da177e4SLinus Torvalds union acpi_object *element; 8641da177e4SLinus Torvalds union acpi_object *obj; 8651da177e4SLinus Torvalds struct acpi_power_register *reg; 8661da177e4SLinus Torvalds struct acpi_processor_cx cx; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds memset(&cx, 0, sizeof(cx)); 8691da177e4SLinus Torvalds 87050dd0969SJan Engelhardt element = &(cst->package.elements[i]); 8711da177e4SLinus Torvalds if (element->type != ACPI_TYPE_PACKAGE) 8721da177e4SLinus Torvalds continue; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds if (element->package.count != 4) 8751da177e4SLinus Torvalds continue; 8761da177e4SLinus Torvalds 87750dd0969SJan Engelhardt obj = &(element->package.elements[0]); 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_BUFFER) 8801da177e4SLinus Torvalds continue; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds reg = (struct acpi_power_register *)obj->buffer.pointer; 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && 8851da177e4SLinus Torvalds (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) 8861da177e4SLinus Torvalds continue; 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds /* There should be an easy way to extract an integer... */ 88950dd0969SJan Engelhardt obj = &(element->package.elements[1]); 8901da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 8911da177e4SLinus Torvalds continue; 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds cx.type = obj->integer.value; 894991528d7SVenkatesh Pallipadi /* 895991528d7SVenkatesh Pallipadi * Some buggy BIOSes won't list C1 in _CST - 896991528d7SVenkatesh Pallipadi * Let acpi_processor_get_power_info_default() handle them later 897991528d7SVenkatesh Pallipadi */ 898991528d7SVenkatesh Pallipadi if (i == 1 && cx.type != ACPI_STATE_C1) 899991528d7SVenkatesh Pallipadi current_count++; 9001da177e4SLinus Torvalds 901991528d7SVenkatesh Pallipadi cx.address = reg->address; 902991528d7SVenkatesh Pallipadi cx.index = current_count + 1; 9031da177e4SLinus Torvalds 904991528d7SVenkatesh Pallipadi cx.space_id = ACPI_CSTATE_SYSTEMIO; 905991528d7SVenkatesh Pallipadi if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 906991528d7SVenkatesh Pallipadi if (acpi_processor_ffh_cstate_probe 907991528d7SVenkatesh Pallipadi (pr->id, &cx, reg) == 0) { 908991528d7SVenkatesh Pallipadi cx.space_id = ACPI_CSTATE_FFH; 909991528d7SVenkatesh Pallipadi } else if (cx.type != ACPI_STATE_C1) { 910991528d7SVenkatesh Pallipadi /* 911991528d7SVenkatesh Pallipadi * C1 is a special case where FIXED_HARDWARE 912991528d7SVenkatesh Pallipadi * can be handled in non-MWAIT way as well. 913991528d7SVenkatesh Pallipadi * In that case, save this _CST entry info. 914991528d7SVenkatesh Pallipadi * That is, we retain space_id of SYSTEM_IO for 915991528d7SVenkatesh Pallipadi * halt based C1. 916991528d7SVenkatesh Pallipadi * Otherwise, ignore this info and continue. 917991528d7SVenkatesh Pallipadi */ 9181da177e4SLinus Torvalds continue; 919991528d7SVenkatesh Pallipadi } 920991528d7SVenkatesh Pallipadi } 9211da177e4SLinus Torvalds 92250dd0969SJan Engelhardt obj = &(element->package.elements[2]); 9231da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 9241da177e4SLinus Torvalds continue; 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds cx.latency = obj->integer.value; 9271da177e4SLinus Torvalds 92850dd0969SJan Engelhardt obj = &(element->package.elements[3]); 9291da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 9301da177e4SLinus Torvalds continue; 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds cx.power = obj->integer.value; 9331da177e4SLinus Torvalds 934cf824788SJanosch Machowinski current_count++; 935cf824788SJanosch Machowinski memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); 936cf824788SJanosch Machowinski 937cf824788SJanosch Machowinski /* 938cf824788SJanosch Machowinski * We support total ACPI_PROCESSOR_MAX_POWER - 1 939cf824788SJanosch Machowinski * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) 940cf824788SJanosch Machowinski */ 941cf824788SJanosch Machowinski if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { 942cf824788SJanosch Machowinski printk(KERN_WARNING 943cf824788SJanosch Machowinski "Limiting number of power states to max (%d)\n", 944cf824788SJanosch Machowinski ACPI_PROCESSOR_MAX_POWER); 945cf824788SJanosch Machowinski printk(KERN_WARNING 946cf824788SJanosch Machowinski "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); 947cf824788SJanosch Machowinski break; 948cf824788SJanosch Machowinski } 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 9514be44fcdSLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", 952cf824788SJanosch Machowinski current_count)); 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds /* Validate number of power states discovered */ 955cf824788SJanosch Machowinski if (current_count < 2) 9566d93c648SVenkatesh Pallipadi status = -EFAULT; 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds end: 95902438d87SLen Brown kfree(buffer.pointer); 9601da177e4SLinus Torvalds 961d550d98dSPatrick Mochel return status; 9621da177e4SLinus Torvalds } 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) 9651da177e4SLinus Torvalds { 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds if (!cx->address) 968d550d98dSPatrick Mochel return; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds /* 9711da177e4SLinus Torvalds * C2 latency must be less than or equal to 100 9721da177e4SLinus Torvalds * microseconds. 9731da177e4SLinus Torvalds */ 9741da177e4SLinus Torvalds else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { 9751da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 9764be44fcdSLen Brown "latency too large [%d]\n", cx->latency)); 977d550d98dSPatrick Mochel return; 9781da177e4SLinus Torvalds } 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds /* 9811da177e4SLinus Torvalds * Otherwise we've met all of our C2 requirements. 9821da177e4SLinus Torvalds * Normalize the C2 latency to expidite policy 9831da177e4SLinus Torvalds */ 9841da177e4SLinus Torvalds cx->valid = 1; 9854f86d3a8SLen Brown 9864f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 9871da177e4SLinus Torvalds cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); 9884f86d3a8SLen Brown #else 9894f86d3a8SLen Brown cx->latency_ticks = cx->latency; 9904f86d3a8SLen Brown #endif 9911da177e4SLinus Torvalds 992d550d98dSPatrick Mochel return; 9931da177e4SLinus Torvalds } 9941da177e4SLinus Torvalds 9954be44fcdSLen Brown static void acpi_processor_power_verify_c3(struct acpi_processor *pr, 9961da177e4SLinus Torvalds struct acpi_processor_cx *cx) 9971da177e4SLinus Torvalds { 99802df8b93SVenkatesh Pallipadi static int bm_check_flag; 99902df8b93SVenkatesh Pallipadi 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds if (!cx->address) 1002d550d98dSPatrick Mochel return; 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds /* 10051da177e4SLinus Torvalds * C3 latency must be less than or equal to 1000 10061da177e4SLinus Torvalds * microseconds. 10071da177e4SLinus Torvalds */ 10081da177e4SLinus Torvalds else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { 10091da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 10104be44fcdSLen Brown "latency too large [%d]\n", cx->latency)); 1011d550d98dSPatrick Mochel return; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds /* 10151da177e4SLinus Torvalds * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) 10161da177e4SLinus Torvalds * DMA transfers are used by any ISA device to avoid livelock. 10171da177e4SLinus Torvalds * Note that we could disable Type-F DMA (as recommended by 10181da177e4SLinus Torvalds * the erratum), but this is known to disrupt certain ISA 10191da177e4SLinus Torvalds * devices thus we take the conservative approach. 10201da177e4SLinus Torvalds */ 10211da177e4SLinus Torvalds else if (errata.piix4.fdma) { 10221da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 10231da177e4SLinus Torvalds "C3 not supported on PIIX4 with Type-F DMA\n")); 1024d550d98dSPatrick Mochel return; 10251da177e4SLinus Torvalds } 10261da177e4SLinus Torvalds 102702df8b93SVenkatesh Pallipadi /* All the logic here assumes flags.bm_check is same across all CPUs */ 102802df8b93SVenkatesh Pallipadi if (!bm_check_flag) { 102902df8b93SVenkatesh Pallipadi /* Determine whether bm_check is needed based on CPU */ 103002df8b93SVenkatesh Pallipadi acpi_processor_power_init_bm_check(&(pr->flags), pr->id); 103102df8b93SVenkatesh Pallipadi bm_check_flag = pr->flags.bm_check; 103202df8b93SVenkatesh Pallipadi } else { 103302df8b93SVenkatesh Pallipadi pr->flags.bm_check = bm_check_flag; 103402df8b93SVenkatesh Pallipadi } 103502df8b93SVenkatesh Pallipadi 103602df8b93SVenkatesh Pallipadi if (pr->flags.bm_check) { 103702df8b93SVenkatesh Pallipadi if (!pr->flags.bm_control) { 1038ed3110efSVenki Pallipadi if (pr->flags.has_cst != 1) { 1039ed3110efSVenki Pallipadi /* bus mastering control is necessary */ 104002df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1041ed3110efSVenki Pallipadi "C3 support requires BM control\n")); 1042ed3110efSVenki Pallipadi return; 1043ed3110efSVenki Pallipadi } else { 1044ed3110efSVenki Pallipadi /* Here we enter C3 without bus mastering */ 1045ed3110efSVenki Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1046ed3110efSVenki Pallipadi "C3 support without BM control\n")); 1047ed3110efSVenki Pallipadi } 104802df8b93SVenkatesh Pallipadi } 104902df8b93SVenkatesh Pallipadi } else { 105002df8b93SVenkatesh Pallipadi /* 105102df8b93SVenkatesh Pallipadi * WBINVD should be set in fadt, for C3 state to be 105202df8b93SVenkatesh Pallipadi * supported on when bm_check is not required. 105302df8b93SVenkatesh Pallipadi */ 1054cee324b1SAlexey Starikovskiy if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { 105502df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 105602df8b93SVenkatesh Pallipadi "Cache invalidation should work properly" 105702df8b93SVenkatesh Pallipadi " for C3 to be enabled on SMP systems\n")); 1058d550d98dSPatrick Mochel return; 105902df8b93SVenkatesh Pallipadi } 1060d8c71b6dSBob Moore acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); 106102df8b93SVenkatesh Pallipadi } 106202df8b93SVenkatesh Pallipadi 10631da177e4SLinus Torvalds /* 10641da177e4SLinus Torvalds * Otherwise we've met all of our C3 requirements. 10651da177e4SLinus Torvalds * Normalize the C3 latency to expidite policy. Enable 10661da177e4SLinus Torvalds * checking of bus mastering status (bm_check) so we can 10671da177e4SLinus Torvalds * use this in our C3 policy 10681da177e4SLinus Torvalds */ 10691da177e4SLinus Torvalds cx->valid = 1; 10704f86d3a8SLen Brown 10714f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 10721da177e4SLinus Torvalds cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency); 10734f86d3a8SLen Brown #else 10744f86d3a8SLen Brown cx->latency_ticks = cx->latency; 10754f86d3a8SLen Brown #endif 10761da177e4SLinus Torvalds 1077d550d98dSPatrick Mochel return; 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds static int acpi_processor_power_verify(struct acpi_processor *pr) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds unsigned int i; 10831da177e4SLinus Torvalds unsigned int working = 0; 10846eb0a0fdSVenkatesh Pallipadi 1085169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = INT_MAX; 10866eb0a0fdSVenkatesh Pallipadi 10871da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 10881da177e4SLinus Torvalds struct acpi_processor_cx *cx = &pr->power.states[i]; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds switch (cx->type) { 10911da177e4SLinus Torvalds case ACPI_STATE_C1: 10921da177e4SLinus Torvalds cx->valid = 1; 10931da177e4SLinus Torvalds break; 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds case ACPI_STATE_C2: 10961da177e4SLinus Torvalds acpi_processor_power_verify_c2(cx); 1097296d93cdSLinus Torvalds if (cx->valid) 1098169a0abbSThomas Gleixner acpi_timer_check_state(i, pr, cx); 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds case ACPI_STATE_C3: 11021da177e4SLinus Torvalds acpi_processor_power_verify_c3(pr, cx); 1103296d93cdSLinus Torvalds if (cx->valid) 1104169a0abbSThomas Gleixner acpi_timer_check_state(i, pr, cx); 11051da177e4SLinus Torvalds break; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds if (cx->valid) 11091da177e4SLinus Torvalds working++; 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds 1112169a0abbSThomas Gleixner acpi_propagate_timer_broadcast(pr); 1113bd663347SAndi Kleen 11141da177e4SLinus Torvalds return (working); 11151da177e4SLinus Torvalds } 11161da177e4SLinus Torvalds 11174be44fcdSLen Brown static int acpi_processor_get_power_info(struct acpi_processor *pr) 11181da177e4SLinus Torvalds { 11191da177e4SLinus Torvalds unsigned int i; 11201da177e4SLinus Torvalds int result; 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds /* NOTE: the idle thread may not be running while calling 11241da177e4SLinus Torvalds * this function */ 11251da177e4SLinus Torvalds 1126991528d7SVenkatesh Pallipadi /* Zero initialize all the C-states info. */ 1127991528d7SVenkatesh Pallipadi memset(pr->power.states, 0, sizeof(pr->power.states)); 1128991528d7SVenkatesh Pallipadi 11291da177e4SLinus Torvalds result = acpi_processor_get_power_info_cst(pr); 11306d93c648SVenkatesh Pallipadi if (result == -ENODEV) 1131c5a114f1SDarrick J. Wong result = acpi_processor_get_power_info_fadt(pr); 11326d93c648SVenkatesh Pallipadi 1133991528d7SVenkatesh Pallipadi if (result) 1134991528d7SVenkatesh Pallipadi return result; 1135991528d7SVenkatesh Pallipadi 1136991528d7SVenkatesh Pallipadi acpi_processor_get_power_info_default(pr); 1137991528d7SVenkatesh Pallipadi 1138cf824788SJanosch Machowinski pr->power.count = acpi_processor_power_verify(pr); 11391da177e4SLinus Torvalds 11404f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 11411da177e4SLinus Torvalds /* 11421da177e4SLinus Torvalds * Set Default Policy 11431da177e4SLinus Torvalds * ------------------ 11441da177e4SLinus Torvalds * Now that we know which states are supported, set the default 11451da177e4SLinus Torvalds * policy. Note that this policy can be changed dynamically 11461da177e4SLinus Torvalds * (e.g. encourage deeper sleeps to conserve battery life when 11471da177e4SLinus Torvalds * not on AC). 11481da177e4SLinus Torvalds */ 11491da177e4SLinus Torvalds result = acpi_processor_set_power_policy(pr); 11501da177e4SLinus Torvalds if (result) 1151d550d98dSPatrick Mochel return result; 11524f86d3a8SLen Brown #endif 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds /* 11551da177e4SLinus Torvalds * if one state of type C2 or C3 is available, mark this 11561da177e4SLinus Torvalds * CPU as being "idle manageable" 11571da177e4SLinus Torvalds */ 11581da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 1159acf05f4bSVenkatesh Pallipadi if (pr->power.states[i].valid) { 11601da177e4SLinus Torvalds pr->power.count = i; 11612203d6edSLinus Torvalds if (pr->power.states[i].type >= ACPI_STATE_C2) 11621da177e4SLinus Torvalds pr->flags.power = 1; 11631da177e4SLinus Torvalds } 1164acf05f4bSVenkatesh Pallipadi } 11651da177e4SLinus Torvalds 1166d550d98dSPatrick Mochel return 0; 11671da177e4SLinus Torvalds } 11681da177e4SLinus Torvalds 11691da177e4SLinus Torvalds static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) 11701da177e4SLinus Torvalds { 117150dd0969SJan Engelhardt struct acpi_processor *pr = seq->private; 11721da177e4SLinus Torvalds unsigned int i; 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds if (!pr) 11761da177e4SLinus Torvalds goto end; 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds seq_printf(seq, "active state: C%zd\n" 11791da177e4SLinus Torvalds "max_cstate: C%d\n" 11805c87579eSArjan van de Ven "bus master activity: %08x\n" 11815c87579eSArjan van de Ven "maximum allowed latency: %d usec\n", 11821da177e4SLinus Torvalds pr->power.state ? pr->power.state - pr->power.states : 0, 11835c87579eSArjan van de Ven max_cstate, (unsigned)pr->power.bm_activity, 11845c87579eSArjan van de Ven system_latency_constraint()); 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds seq_puts(seq, "states:\n"); 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds for (i = 1; i <= pr->power.count; i++) { 11891da177e4SLinus Torvalds seq_printf(seq, " %cC%d: ", 11904be44fcdSLen Brown (&pr->power.states[i] == 11914be44fcdSLen Brown pr->power.state ? '*' : ' '), i); 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds if (!pr->power.states[i].valid) { 11941da177e4SLinus Torvalds seq_puts(seq, "<not supported>\n"); 11951da177e4SLinus Torvalds continue; 11961da177e4SLinus Torvalds } 11971da177e4SLinus Torvalds 11981da177e4SLinus Torvalds switch (pr->power.states[i].type) { 11991da177e4SLinus Torvalds case ACPI_STATE_C1: 12001da177e4SLinus Torvalds seq_printf(seq, "type[C1] "); 12011da177e4SLinus Torvalds break; 12021da177e4SLinus Torvalds case ACPI_STATE_C2: 12031da177e4SLinus Torvalds seq_printf(seq, "type[C2] "); 12041da177e4SLinus Torvalds break; 12051da177e4SLinus Torvalds case ACPI_STATE_C3: 12061da177e4SLinus Torvalds seq_printf(seq, "type[C3] "); 12071da177e4SLinus Torvalds break; 12081da177e4SLinus Torvalds default: 12091da177e4SLinus Torvalds seq_printf(seq, "type[--] "); 12101da177e4SLinus Torvalds break; 12111da177e4SLinus Torvalds } 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds if (pr->power.states[i].promotion.state) 12141da177e4SLinus Torvalds seq_printf(seq, "promotion[C%zd] ", 12151da177e4SLinus Torvalds (pr->power.states[i].promotion.state - 12161da177e4SLinus Torvalds pr->power.states)); 12171da177e4SLinus Torvalds else 12181da177e4SLinus Torvalds seq_puts(seq, "promotion[--] "); 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds if (pr->power.states[i].demotion.state) 12211da177e4SLinus Torvalds seq_printf(seq, "demotion[C%zd] ", 12221da177e4SLinus Torvalds (pr->power.states[i].demotion.state - 12231da177e4SLinus Torvalds pr->power.states)); 12241da177e4SLinus Torvalds else 12251da177e4SLinus Torvalds seq_puts(seq, "demotion[--] "); 12261da177e4SLinus Torvalds 1227a3c6598fSDominik Brodowski seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", 12281da177e4SLinus Torvalds pr->power.states[i].latency, 1229a3c6598fSDominik Brodowski pr->power.states[i].usage, 1230b0b7eaafSAlexey Starikovskiy (unsigned long long)pr->power.states[i].time); 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds end: 1234d550d98dSPatrick Mochel return 0; 12351da177e4SLinus Torvalds } 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) 12381da177e4SLinus Torvalds { 12391da177e4SLinus Torvalds return single_open(file, acpi_processor_power_seq_show, 12401da177e4SLinus Torvalds PDE(inode)->data); 12411da177e4SLinus Torvalds } 12421da177e4SLinus Torvalds 1243d7508032SArjan van de Ven static const struct file_operations acpi_processor_power_fops = { 12441da177e4SLinus Torvalds .open = acpi_processor_power_open_fs, 12451da177e4SLinus Torvalds .read = seq_read, 12461da177e4SLinus Torvalds .llseek = seq_lseek, 12471da177e4SLinus Torvalds .release = single_release, 12481da177e4SLinus Torvalds }; 12491da177e4SLinus Torvalds 12504f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 12514f86d3a8SLen Brown 12524f86d3a8SLen Brown int acpi_processor_cst_has_changed(struct acpi_processor *pr) 12534f86d3a8SLen Brown { 12544f86d3a8SLen Brown int result = 0; 12554f86d3a8SLen Brown 12564f86d3a8SLen Brown 12574f86d3a8SLen Brown if (!pr) 12584f86d3a8SLen Brown return -EINVAL; 12594f86d3a8SLen Brown 12604f86d3a8SLen Brown if (nocst) { 12614f86d3a8SLen Brown return -ENODEV; 12624f86d3a8SLen Brown } 12634f86d3a8SLen Brown 12644f86d3a8SLen Brown if (!pr->flags.power_setup_done) 12654f86d3a8SLen Brown return -ENODEV; 12664f86d3a8SLen Brown 12674f86d3a8SLen Brown /* Fall back to the default idle loop */ 12684f86d3a8SLen Brown pm_idle = pm_idle_save; 12694f86d3a8SLen Brown synchronize_sched(); /* Relies on interrupts forcing exit from idle. */ 12704f86d3a8SLen Brown 12714f86d3a8SLen Brown pr->flags.power = 0; 12724f86d3a8SLen Brown result = acpi_processor_get_power_info(pr); 12734f86d3a8SLen Brown if ((pr->flags.power == 1) && (pr->flags.power_setup_done)) 12744f86d3a8SLen Brown pm_idle = acpi_processor_idle; 12754f86d3a8SLen Brown 12764f86d3a8SLen Brown return result; 12774f86d3a8SLen Brown } 12784f86d3a8SLen Brown 12791fec74a9SAndrew Morton #ifdef CONFIG_SMP 12805c87579eSArjan van de Ven static void smp_callback(void *v) 12815c87579eSArjan van de Ven { 12825c87579eSArjan van de Ven /* we already woke the CPU up, nothing more to do */ 12835c87579eSArjan van de Ven } 12845c87579eSArjan van de Ven 12855c87579eSArjan van de Ven /* 12865c87579eSArjan van de Ven * This function gets called when a part of the kernel has a new latency 12875c87579eSArjan van de Ven * requirement. This means we need to get all processors out of their C-state, 12885c87579eSArjan van de Ven * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that 12895c87579eSArjan van de Ven * wakes them all right up. 12905c87579eSArjan van de Ven */ 12915c87579eSArjan van de Ven static int acpi_processor_latency_notify(struct notifier_block *b, 12925c87579eSArjan van de Ven unsigned long l, void *v) 12935c87579eSArjan van de Ven { 12945c87579eSArjan van de Ven smp_call_function(smp_callback, NULL, 0, 1); 12955c87579eSArjan van de Ven return NOTIFY_OK; 12965c87579eSArjan van de Ven } 12975c87579eSArjan van de Ven 12985c87579eSArjan van de Ven static struct notifier_block acpi_processor_latency_notifier = { 12995c87579eSArjan van de Ven .notifier_call = acpi_processor_latency_notify, 13005c87579eSArjan van de Ven }; 13014f86d3a8SLen Brown 13021fec74a9SAndrew Morton #endif 13035c87579eSArjan van de Ven 13044f86d3a8SLen Brown #else /* CONFIG_CPU_IDLE */ 13054f86d3a8SLen Brown 13064f86d3a8SLen Brown /** 13074f86d3a8SLen Brown * acpi_idle_bm_check - checks if bus master activity was detected 13084f86d3a8SLen Brown */ 13094f86d3a8SLen Brown static int acpi_idle_bm_check(void) 13104f86d3a8SLen Brown { 13114f86d3a8SLen Brown u32 bm_status = 0; 13124f86d3a8SLen Brown 13134f86d3a8SLen Brown acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); 13144f86d3a8SLen Brown if (bm_status) 13154f86d3a8SLen Brown acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); 13164f86d3a8SLen Brown /* 13174f86d3a8SLen Brown * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect 13184f86d3a8SLen Brown * the true state of bus mastering activity; forcing us to 13194f86d3a8SLen Brown * manually check the BMIDEA bit of each IDE channel. 13204f86d3a8SLen Brown */ 13214f86d3a8SLen Brown else if (errata.piix4.bmisx) { 13224f86d3a8SLen Brown if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) 13234f86d3a8SLen Brown || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) 13244f86d3a8SLen Brown bm_status = 1; 13254f86d3a8SLen Brown } 13264f86d3a8SLen Brown return bm_status; 13274f86d3a8SLen Brown } 13284f86d3a8SLen Brown 13294f86d3a8SLen Brown /** 13304f86d3a8SLen Brown * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state 13314f86d3a8SLen Brown * @pr: the processor 13324f86d3a8SLen Brown * @target: the new target state 13334f86d3a8SLen Brown */ 13344f86d3a8SLen Brown static inline void acpi_idle_update_bm_rld(struct acpi_processor *pr, 13354f86d3a8SLen Brown struct acpi_processor_cx *target) 13364f86d3a8SLen Brown { 13374f86d3a8SLen Brown if (pr->flags.bm_rld_set && target->type != ACPI_STATE_C3) { 13384f86d3a8SLen Brown acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0); 13394f86d3a8SLen Brown pr->flags.bm_rld_set = 0; 13404f86d3a8SLen Brown } 13414f86d3a8SLen Brown 13424f86d3a8SLen Brown if (!pr->flags.bm_rld_set && target->type == ACPI_STATE_C3) { 13434f86d3a8SLen Brown acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1); 13444f86d3a8SLen Brown pr->flags.bm_rld_set = 1; 13454f86d3a8SLen Brown } 13464f86d3a8SLen Brown } 13474f86d3a8SLen Brown 13484f86d3a8SLen Brown /** 13494f86d3a8SLen Brown * acpi_idle_do_entry - a helper function that does C2 and C3 type entry 13504f86d3a8SLen Brown * @cx: cstate data 13514f86d3a8SLen Brown */ 13524f86d3a8SLen Brown static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) 13534f86d3a8SLen Brown { 13544f86d3a8SLen Brown if (cx->space_id == ACPI_CSTATE_FFH) { 13554f86d3a8SLen Brown /* Call into architectural FFH based C-state */ 13564f86d3a8SLen Brown acpi_processor_ffh_cstate_enter(cx); 13574f86d3a8SLen Brown } else { 13584f86d3a8SLen Brown int unused; 13594f86d3a8SLen Brown /* IO port based C-state */ 13604f86d3a8SLen Brown inb(cx->address); 13614f86d3a8SLen Brown /* Dummy wait op - must do something useless after P_LVL2 read 13624f86d3a8SLen Brown because chipsets cannot guarantee that STPCLK# signal 13634f86d3a8SLen Brown gets asserted in time to freeze execution properly. */ 13644f86d3a8SLen Brown unused = inl(acpi_gbl_FADT.xpm_timer_block.address); 13654f86d3a8SLen Brown } 13664f86d3a8SLen Brown } 13674f86d3a8SLen Brown 13684f86d3a8SLen Brown /** 13694f86d3a8SLen Brown * acpi_idle_enter_c1 - enters an ACPI C1 state-type 13704f86d3a8SLen Brown * @dev: the target CPU 13714f86d3a8SLen Brown * @state: the state data 13724f86d3a8SLen Brown * 13734f86d3a8SLen Brown * This is equivalent to the HALT instruction. 13744f86d3a8SLen Brown */ 13754f86d3a8SLen Brown static int acpi_idle_enter_c1(struct cpuidle_device *dev, 13764f86d3a8SLen Brown struct cpuidle_state *state) 13774f86d3a8SLen Brown { 13784f86d3a8SLen Brown struct acpi_processor *pr; 13794f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 13804f86d3a8SLen Brown pr = processors[smp_processor_id()]; 13814f86d3a8SLen Brown 13824f86d3a8SLen Brown if (unlikely(!pr)) 13834f86d3a8SLen Brown return 0; 13844f86d3a8SLen Brown 13854f86d3a8SLen Brown if (pr->flags.bm_check) 13864f86d3a8SLen Brown acpi_idle_update_bm_rld(pr, cx); 13874f86d3a8SLen Brown 13884f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 13894f86d3a8SLen Brown /* 13904f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 13914f86d3a8SLen Brown * NEED_RESCHED: 13924f86d3a8SLen Brown */ 13934f86d3a8SLen Brown smp_mb(); 13944f86d3a8SLen Brown if (!need_resched()) 13954f86d3a8SLen Brown safe_halt(); 13964f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 13974f86d3a8SLen Brown 13984f86d3a8SLen Brown cx->usage++; 13994f86d3a8SLen Brown 14004f86d3a8SLen Brown return 0; 14014f86d3a8SLen Brown } 14024f86d3a8SLen Brown 14034f86d3a8SLen Brown /** 14044f86d3a8SLen Brown * acpi_idle_enter_simple - enters an ACPI state without BM handling 14054f86d3a8SLen Brown * @dev: the target CPU 14064f86d3a8SLen Brown * @state: the state data 14074f86d3a8SLen Brown */ 14084f86d3a8SLen Brown static int acpi_idle_enter_simple(struct cpuidle_device *dev, 14094f86d3a8SLen Brown struct cpuidle_state *state) 14104f86d3a8SLen Brown { 14114f86d3a8SLen Brown struct acpi_processor *pr; 14124f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 14134f86d3a8SLen Brown u32 t1, t2; 14144f86d3a8SLen Brown pr = processors[smp_processor_id()]; 14154f86d3a8SLen Brown 14164f86d3a8SLen Brown if (unlikely(!pr)) 14174f86d3a8SLen Brown return 0; 14184f86d3a8SLen Brown 1419*e196441bSLen Brown if (acpi_idle_suspend) 1420*e196441bSLen Brown return(acpi_idle_enter_c1(dev, state)); 1421*e196441bSLen Brown 14224f86d3a8SLen Brown if (pr->flags.bm_check) 14234f86d3a8SLen Brown acpi_idle_update_bm_rld(pr, cx); 14244f86d3a8SLen Brown 14254f86d3a8SLen Brown local_irq_disable(); 14264f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 14274f86d3a8SLen Brown /* 14284f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 14294f86d3a8SLen Brown * NEED_RESCHED: 14304f86d3a8SLen Brown */ 14314f86d3a8SLen Brown smp_mb(); 14324f86d3a8SLen Brown 14334f86d3a8SLen Brown if (unlikely(need_resched())) { 14344f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 14354f86d3a8SLen Brown local_irq_enable(); 14364f86d3a8SLen Brown return 0; 14374f86d3a8SLen Brown } 14384f86d3a8SLen Brown 14394f86d3a8SLen Brown if (cx->type == ACPI_STATE_C3) 14404f86d3a8SLen Brown ACPI_FLUSH_CPU_CACHE(); 14414f86d3a8SLen Brown 14424f86d3a8SLen Brown t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); 14434f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 1); 14444f86d3a8SLen Brown acpi_idle_do_entry(cx); 14454f86d3a8SLen Brown t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); 14464f86d3a8SLen Brown 14474f86d3a8SLen Brown #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) 14484f86d3a8SLen Brown /* TSC could halt in idle, so notify users */ 14494f86d3a8SLen Brown mark_tsc_unstable("TSC halts in idle");; 14504f86d3a8SLen Brown #endif 14514f86d3a8SLen Brown 14524f86d3a8SLen Brown local_irq_enable(); 14534f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 14544f86d3a8SLen Brown 14554f86d3a8SLen Brown cx->usage++; 14564f86d3a8SLen Brown 14574f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 0); 14584f86d3a8SLen Brown cx->time += ticks_elapsed(t1, t2); 14594f86d3a8SLen Brown return ticks_elapsed_in_us(t1, t2); 14604f86d3a8SLen Brown } 14614f86d3a8SLen Brown 14624f86d3a8SLen Brown static int c3_cpu_count; 14634f86d3a8SLen Brown static DEFINE_SPINLOCK(c3_lock); 14644f86d3a8SLen Brown 14654f86d3a8SLen Brown /** 14664f86d3a8SLen Brown * acpi_idle_enter_bm - enters C3 with proper BM handling 14674f86d3a8SLen Brown * @dev: the target CPU 14684f86d3a8SLen Brown * @state: the state data 14694f86d3a8SLen Brown * 14704f86d3a8SLen Brown * If BM is detected, the deepest non-C3 idle state is entered instead. 14714f86d3a8SLen Brown */ 14724f86d3a8SLen Brown static int acpi_idle_enter_bm(struct cpuidle_device *dev, 14734f86d3a8SLen Brown struct cpuidle_state *state) 14744f86d3a8SLen Brown { 14754f86d3a8SLen Brown struct acpi_processor *pr; 14764f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 14774f86d3a8SLen Brown u32 t1, t2; 14784f86d3a8SLen Brown pr = processors[smp_processor_id()]; 14794f86d3a8SLen Brown 14804f86d3a8SLen Brown if (unlikely(!pr)) 14814f86d3a8SLen Brown return 0; 14824f86d3a8SLen Brown 1483*e196441bSLen Brown if (acpi_idle_suspend) 1484*e196441bSLen Brown return(acpi_idle_enter_c1(dev, state)); 1485*e196441bSLen Brown 14864f86d3a8SLen Brown local_irq_disable(); 14874f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 14884f86d3a8SLen Brown /* 14894f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 14904f86d3a8SLen Brown * NEED_RESCHED: 14914f86d3a8SLen Brown */ 14924f86d3a8SLen Brown smp_mb(); 14934f86d3a8SLen Brown 14944f86d3a8SLen Brown if (unlikely(need_resched())) { 14954f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 14964f86d3a8SLen Brown local_irq_enable(); 14974f86d3a8SLen Brown return 0; 14984f86d3a8SLen Brown } 14994f86d3a8SLen Brown 15004f86d3a8SLen Brown /* 15014f86d3a8SLen Brown * Must be done before busmaster disable as we might need to 15024f86d3a8SLen Brown * access HPET ! 15034f86d3a8SLen Brown */ 15044f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 1); 15054f86d3a8SLen Brown 15064f86d3a8SLen Brown if (acpi_idle_bm_check()) { 15074f86d3a8SLen Brown cx = pr->power.bm_state; 15084f86d3a8SLen Brown 15094f86d3a8SLen Brown acpi_idle_update_bm_rld(pr, cx); 15104f86d3a8SLen Brown 15114f86d3a8SLen Brown t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); 15124f86d3a8SLen Brown acpi_idle_do_entry(cx); 15134f86d3a8SLen Brown t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); 15144f86d3a8SLen Brown } else { 15154f86d3a8SLen Brown acpi_idle_update_bm_rld(pr, cx); 15164f86d3a8SLen Brown 15174f86d3a8SLen Brown spin_lock(&c3_lock); 15184f86d3a8SLen Brown c3_cpu_count++; 15194f86d3a8SLen Brown /* Disable bus master arbitration when all CPUs are in C3 */ 15204f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 15214f86d3a8SLen Brown acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1); 15224f86d3a8SLen Brown spin_unlock(&c3_lock); 15234f86d3a8SLen Brown 15244f86d3a8SLen Brown t1 = inl(acpi_gbl_FADT.xpm_timer_block.address); 15254f86d3a8SLen Brown acpi_idle_do_entry(cx); 15264f86d3a8SLen Brown t2 = inl(acpi_gbl_FADT.xpm_timer_block.address); 15274f86d3a8SLen Brown 15284f86d3a8SLen Brown spin_lock(&c3_lock); 15294f86d3a8SLen Brown /* Re-enable bus master arbitration */ 15304f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 15314f86d3a8SLen Brown acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0); 15324f86d3a8SLen Brown c3_cpu_count--; 15334f86d3a8SLen Brown spin_unlock(&c3_lock); 15344f86d3a8SLen Brown } 15354f86d3a8SLen Brown 15364f86d3a8SLen Brown #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC) 15374f86d3a8SLen Brown /* TSC could halt in idle, so notify users */ 15384f86d3a8SLen Brown mark_tsc_unstable("TSC halts in idle"); 15394f86d3a8SLen Brown #endif 15404f86d3a8SLen Brown 15414f86d3a8SLen Brown local_irq_enable(); 15424f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 15434f86d3a8SLen Brown 15444f86d3a8SLen Brown cx->usage++; 15454f86d3a8SLen Brown 15464f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 0); 15474f86d3a8SLen Brown cx->time += ticks_elapsed(t1, t2); 15484f86d3a8SLen Brown return ticks_elapsed_in_us(t1, t2); 15494f86d3a8SLen Brown } 15504f86d3a8SLen Brown 15514f86d3a8SLen Brown struct cpuidle_driver acpi_idle_driver = { 15524f86d3a8SLen Brown .name = "acpi_idle", 15534f86d3a8SLen Brown .owner = THIS_MODULE, 15544f86d3a8SLen Brown }; 15554f86d3a8SLen Brown 15564f86d3a8SLen Brown /** 15574f86d3a8SLen Brown * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE 15584f86d3a8SLen Brown * @pr: the ACPI processor 15594f86d3a8SLen Brown */ 15604f86d3a8SLen Brown static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) 15614f86d3a8SLen Brown { 15624f86d3a8SLen Brown int i, count = 0; 15634f86d3a8SLen Brown struct acpi_processor_cx *cx; 15644f86d3a8SLen Brown struct cpuidle_state *state; 15654f86d3a8SLen Brown struct cpuidle_device *dev = &pr->power.dev; 15664f86d3a8SLen Brown 15674f86d3a8SLen Brown if (!pr->flags.power_setup_done) 15684f86d3a8SLen Brown return -EINVAL; 15694f86d3a8SLen Brown 15704f86d3a8SLen Brown if (pr->flags.power == 0) { 15714f86d3a8SLen Brown return -EINVAL; 15724f86d3a8SLen Brown } 15734f86d3a8SLen Brown 15744f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 15754f86d3a8SLen Brown cx = &pr->power.states[i]; 15764f86d3a8SLen Brown state = &dev->states[count]; 15774f86d3a8SLen Brown 15784f86d3a8SLen Brown if (!cx->valid) 15794f86d3a8SLen Brown continue; 15804f86d3a8SLen Brown 15814f86d3a8SLen Brown #ifdef CONFIG_HOTPLUG_CPU 15824f86d3a8SLen Brown if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 15834f86d3a8SLen Brown !pr->flags.has_cst && 15844f86d3a8SLen Brown !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 15854f86d3a8SLen Brown continue; 15864f86d3a8SLen Brown #endif 15874f86d3a8SLen Brown cpuidle_set_statedata(state, cx); 15884f86d3a8SLen Brown 15894f86d3a8SLen Brown snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); 15904f86d3a8SLen Brown state->exit_latency = cx->latency; 15914f86d3a8SLen Brown state->target_residency = cx->latency * 6; 15924f86d3a8SLen Brown state->power_usage = cx->power; 15934f86d3a8SLen Brown 15944f86d3a8SLen Brown state->flags = 0; 15954f86d3a8SLen Brown switch (cx->type) { 15964f86d3a8SLen Brown case ACPI_STATE_C1: 15974f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_SHALLOW; 15984f86d3a8SLen Brown state->enter = acpi_idle_enter_c1; 15994f86d3a8SLen Brown break; 16004f86d3a8SLen Brown 16014f86d3a8SLen Brown case ACPI_STATE_C2: 16024f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_BALANCED; 16034f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 16044f86d3a8SLen Brown state->enter = acpi_idle_enter_simple; 16054f86d3a8SLen Brown break; 16064f86d3a8SLen Brown 16074f86d3a8SLen Brown case ACPI_STATE_C3: 16084f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_DEEP; 16094f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 16104f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_CHECK_BM; 16114f86d3a8SLen Brown state->enter = pr->flags.bm_check ? 16124f86d3a8SLen Brown acpi_idle_enter_bm : 16134f86d3a8SLen Brown acpi_idle_enter_simple; 16144f86d3a8SLen Brown break; 16154f86d3a8SLen Brown } 16164f86d3a8SLen Brown 16174f86d3a8SLen Brown count++; 16184f86d3a8SLen Brown } 16194f86d3a8SLen Brown 16204f86d3a8SLen Brown dev->state_count = count; 16214f86d3a8SLen Brown 16224f86d3a8SLen Brown if (!count) 16234f86d3a8SLen Brown return -EINVAL; 16244f86d3a8SLen Brown 16254f86d3a8SLen Brown /* find the deepest state that can handle active BM */ 16264f86d3a8SLen Brown if (pr->flags.bm_check) { 16274f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) 16284f86d3a8SLen Brown if (pr->power.states[i].type == ACPI_STATE_C3) 16294f86d3a8SLen Brown break; 16304f86d3a8SLen Brown pr->power.bm_state = &pr->power.states[i-1]; 16314f86d3a8SLen Brown } 16324f86d3a8SLen Brown 16334f86d3a8SLen Brown return 0; 16344f86d3a8SLen Brown } 16354f86d3a8SLen Brown 16364f86d3a8SLen Brown int acpi_processor_cst_has_changed(struct acpi_processor *pr) 16374f86d3a8SLen Brown { 16384f86d3a8SLen Brown int ret; 16394f86d3a8SLen Brown 16404f86d3a8SLen Brown if (!pr) 16414f86d3a8SLen Brown return -EINVAL; 16424f86d3a8SLen Brown 16434f86d3a8SLen Brown if (nocst) { 16444f86d3a8SLen Brown return -ENODEV; 16454f86d3a8SLen Brown } 16464f86d3a8SLen Brown 16474f86d3a8SLen Brown if (!pr->flags.power_setup_done) 16484f86d3a8SLen Brown return -ENODEV; 16494f86d3a8SLen Brown 16504f86d3a8SLen Brown cpuidle_pause_and_lock(); 16514f86d3a8SLen Brown cpuidle_disable_device(&pr->power.dev); 16524f86d3a8SLen Brown acpi_processor_get_power_info(pr); 16534f86d3a8SLen Brown acpi_processor_setup_cpuidle(pr); 16544f86d3a8SLen Brown ret = cpuidle_enable_device(&pr->power.dev); 16554f86d3a8SLen Brown cpuidle_resume_and_unlock(); 16564f86d3a8SLen Brown 16574f86d3a8SLen Brown return ret; 16584f86d3a8SLen Brown } 16594f86d3a8SLen Brown 16604f86d3a8SLen Brown #endif /* CONFIG_CPU_IDLE */ 16614f86d3a8SLen Brown 16627af8b660SPierre Ossman int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, 16634be44fcdSLen Brown struct acpi_device *device) 16641da177e4SLinus Torvalds { 16651da177e4SLinus Torvalds acpi_status status = 0; 1666b6835052SAndreas Mohr static int first_run; 16671da177e4SLinus Torvalds struct proc_dir_entry *entry = NULL; 16681da177e4SLinus Torvalds unsigned int i; 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds if (!first_run) { 16721da177e4SLinus Torvalds dmi_check_system(processor_power_dmi_table); 16731da177e4SLinus Torvalds if (max_cstate < ACPI_C_STATES_MAX) 16744be44fcdSLen Brown printk(KERN_NOTICE 16754be44fcdSLen Brown "ACPI: processor limited to max C-state %d\n", 16764be44fcdSLen Brown max_cstate); 16771da177e4SLinus Torvalds first_run++; 16784f86d3a8SLen Brown #if !defined (CONFIG_CPU_IDLE) && defined (CONFIG_SMP) 16795c87579eSArjan van de Ven register_latency_notifier(&acpi_processor_latency_notifier); 16801fec74a9SAndrew Morton #endif 16811da177e4SLinus Torvalds } 16821da177e4SLinus Torvalds 168302df8b93SVenkatesh Pallipadi if (!pr) 1684d550d98dSPatrick Mochel return -EINVAL; 168502df8b93SVenkatesh Pallipadi 1686cee324b1SAlexey Starikovskiy if (acpi_gbl_FADT.cst_control && !nocst) { 16874be44fcdSLen Brown status = 1688cee324b1SAlexey Starikovskiy acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); 16891da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 1690a6fc6720SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, 1691a6fc6720SThomas Renninger "Notifying BIOS of _CST ability failed")); 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds } 16941da177e4SLinus Torvalds 16951da177e4SLinus Torvalds acpi_processor_get_power_info(pr); 16964f86d3a8SLen Brown pr->flags.power_setup_done = 1; 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds /* 16991da177e4SLinus Torvalds * Install the idle handler if processor power management is supported. 17001da177e4SLinus Torvalds * Note that we use previously set idle handler will be used on 17011da177e4SLinus Torvalds * platforms that only support C1. 17021da177e4SLinus Torvalds */ 17031da177e4SLinus Torvalds if ((pr->flags.power) && (!boot_option_idle_override)) { 17044f86d3a8SLen Brown #ifdef CONFIG_CPU_IDLE 17054f86d3a8SLen Brown acpi_processor_setup_cpuidle(pr); 17064f86d3a8SLen Brown pr->power.dev.cpu = pr->id; 17074f86d3a8SLen Brown if (cpuidle_register_device(&pr->power.dev)) 17084f86d3a8SLen Brown return -EIO; 17094f86d3a8SLen Brown #endif 17104f86d3a8SLen Brown 17111da177e4SLinus Torvalds printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); 17121da177e4SLinus Torvalds for (i = 1; i <= pr->power.count; i++) 17131da177e4SLinus Torvalds if (pr->power.states[i].valid) 17144be44fcdSLen Brown printk(" C%d[C%d]", i, 17154be44fcdSLen Brown pr->power.states[i].type); 17161da177e4SLinus Torvalds printk(")\n"); 17171da177e4SLinus Torvalds 17184f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 17191da177e4SLinus Torvalds if (pr->id == 0) { 17201da177e4SLinus Torvalds pm_idle_save = pm_idle; 17211da177e4SLinus Torvalds pm_idle = acpi_processor_idle; 17221da177e4SLinus Torvalds } 17234f86d3a8SLen Brown #endif 17241da177e4SLinus Torvalds } 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds /* 'power' [R] */ 17271da177e4SLinus Torvalds entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, 17281da177e4SLinus Torvalds S_IRUGO, acpi_device_dir(device)); 17291da177e4SLinus Torvalds if (!entry) 1730a6fc6720SThomas Renninger return -EIO; 17311da177e4SLinus Torvalds else { 17321da177e4SLinus Torvalds entry->proc_fops = &acpi_processor_power_fops; 17331da177e4SLinus Torvalds entry->data = acpi_driver_data(device); 17341da177e4SLinus Torvalds entry->owner = THIS_MODULE; 17351da177e4SLinus Torvalds } 17361da177e4SLinus Torvalds 1737d550d98dSPatrick Mochel return 0; 17381da177e4SLinus Torvalds } 17391da177e4SLinus Torvalds 17404be44fcdSLen Brown int acpi_processor_power_exit(struct acpi_processor *pr, 17414be44fcdSLen Brown struct acpi_device *device) 17421da177e4SLinus Torvalds { 17434f86d3a8SLen Brown #ifdef CONFIG_CPU_IDLE 17444f86d3a8SLen Brown if ((pr->flags.power) && (!boot_option_idle_override)) 17454f86d3a8SLen Brown cpuidle_unregister_device(&pr->power.dev); 17464f86d3a8SLen Brown #endif 17471da177e4SLinus Torvalds pr->flags.power_setup_done = 0; 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds if (acpi_device_dir(device)) 17504be44fcdSLen Brown remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, 17514be44fcdSLen Brown acpi_device_dir(device)); 17521da177e4SLinus Torvalds 17534f86d3a8SLen Brown #ifndef CONFIG_CPU_IDLE 17544f86d3a8SLen Brown 17551da177e4SLinus Torvalds /* Unregister the idle handler when processor #0 is removed. */ 17561da177e4SLinus Torvalds if (pr->id == 0) { 17571da177e4SLinus Torvalds pm_idle = pm_idle_save; 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds /* 17601da177e4SLinus Torvalds * We are about to unload the current idle thread pm callback 17611da177e4SLinus Torvalds * (pm_idle), Wait for all processors to update cached/local 17621da177e4SLinus Torvalds * copies of pm_idle before proceeding. 17631da177e4SLinus Torvalds */ 17641da177e4SLinus Torvalds cpu_idle_wait(); 17651fec74a9SAndrew Morton #ifdef CONFIG_SMP 17665c87579eSArjan van de Ven unregister_latency_notifier(&acpi_processor_latency_notifier); 17671fec74a9SAndrew Morton #endif 17681da177e4SLinus Torvalds } 17694f86d3a8SLen Brown #endif 17701da177e4SLinus Torvalds 1771d550d98dSPatrick Mochel return 0; 17721da177e4SLinus Torvalds } 1773