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> 355a0e3ad6STejun Heo #include <linux/slab.h> 361da177e4SLinus Torvalds #include <linux/acpi.h> 371da177e4SLinus Torvalds #include <linux/dmi.h> 381da177e4SLinus Torvalds #include <linux/moduleparam.h> 394e57b681STim Schmielau #include <linux/sched.h> /* need_resched() */ 40e8db0be1SJean Pihet #include <linux/pm_qos.h> 41e9e2cdb4SThomas Gleixner #include <linux/clockchips.h> 424f86d3a8SLen Brown #include <linux/cpuidle.h> 43ba84be23SRussell King #include <linux/irqflags.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> 60c1e3b377SZhao Yakui #include <asm/processor.h> 611da177e4SLinus Torvalds 62a192a958SLen Brown #define PREFIX "ACPI: " 63a192a958SLen Brown 641da177e4SLinus Torvalds #define ACPI_PROCESSOR_CLASS "processor" 651da177e4SLinus Torvalds #define _COMPONENT ACPI_PROCESSOR_COMPONENT 66f52fd66dSLen Brown ACPI_MODULE_NAME("processor_idle"); 672aa44d05SIngo Molnar #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) 684f86d3a8SLen Brown #define C2_OVERHEAD 1 /* 1us */ 694f86d3a8SLen Brown #define C3_OVERHEAD 1 /* 1us */ 704f86d3a8SLen Brown #define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) 711da177e4SLinus Torvalds 724f86d3a8SLen Brown static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; 734f86d3a8SLen Brown module_param(max_cstate, uint, 0000); 74b6835052SAndreas Mohr static unsigned int nocst __read_mostly; 751da177e4SLinus Torvalds module_param(nocst, uint, 0000); 76d3e7e99fSLen Brown static int bm_check_disable __read_mostly; 77d3e7e99fSLen Brown module_param(bm_check_disable, uint, 0000); 781da177e4SLinus Torvalds 7925de5718SLen Brown static unsigned int latency_factor __read_mostly = 2; 804963f620SLen Brown module_param(latency_factor, uint, 0644); 811da177e4SLinus Torvalds 82d1896049SThomas Renninger static int disabled_by_idle_boot_param(void) 83d1896049SThomas Renninger { 84d1896049SThomas Renninger return boot_option_idle_override == IDLE_POLL || 85d1896049SThomas Renninger boot_option_idle_override == IDLE_FORCE_MWAIT || 86d1896049SThomas Renninger boot_option_idle_override == IDLE_HALT; 87d1896049SThomas Renninger } 88d1896049SThomas Renninger 891da177e4SLinus Torvalds /* 901da177e4SLinus Torvalds * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. 911da177e4SLinus Torvalds * For now disable this. Probably a bug somewhere else. 921da177e4SLinus Torvalds * 931da177e4SLinus Torvalds * To skip this limit, boot/load with a large max_cstate limit. 941da177e4SLinus Torvalds */ 951855256cSJeff Garzik static int set_max_cstate(const struct dmi_system_id *id) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds if (max_cstate > ACPI_PROCESSOR_MAX_POWER) 981da177e4SLinus Torvalds return 0; 991da177e4SLinus Torvalds 1003d35600aSLen Brown printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." 1011da177e4SLinus Torvalds " Override with \"processor.max_cstate=%d\"\n", id->ident, 1023d35600aSLen Brown (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); 1031da177e4SLinus Torvalds 1043d35600aSLen Brown max_cstate = (long)id->driver_data; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds return 0; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1097ded5689SAshok Raj /* Actually this shouldn't be __cpuinitdata, would be better to fix the 1107ded5689SAshok Raj callers to only run once -AK */ 1117ded5689SAshok Raj static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { 112335f16beSDavid Shaohua Li { set_max_cstate, "Clevo 5600D", { 113876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), 114876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, 115335f16beSDavid Shaohua Li (void *)2}, 116370d5cd8SArjan van de Ven { set_max_cstate, "Pavilion zv5000", { 117370d5cd8SArjan van de Ven DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 118370d5cd8SArjan van de Ven DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, 119370d5cd8SArjan van de Ven (void *)1}, 120370d5cd8SArjan van de Ven { set_max_cstate, "Asus L8400B", { 121370d5cd8SArjan van de Ven DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 122370d5cd8SArjan van de Ven DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, 123370d5cd8SArjan van de Ven (void *)1}, 1241da177e4SLinus Torvalds {}, 1251da177e4SLinus Torvalds }; 1261da177e4SLinus Torvalds 1274f86d3a8SLen Brown 1282e906655Svenkatesh.pallipadi@intel.com /* 1292e906655Svenkatesh.pallipadi@intel.com * Callers should disable interrupts before the call and enable 1302e906655Svenkatesh.pallipadi@intel.com * interrupts after return. 1312e906655Svenkatesh.pallipadi@intel.com */ 132ddc081a1SVenkatesh Pallipadi static void acpi_safe_halt(void) 133ddc081a1SVenkatesh Pallipadi { 134ddc081a1SVenkatesh Pallipadi current_thread_info()->status &= ~TS_POLLING; 135ddc081a1SVenkatesh Pallipadi /* 136ddc081a1SVenkatesh Pallipadi * TS_POLLING-cleared state must be visible before we 137ddc081a1SVenkatesh Pallipadi * test NEED_RESCHED: 138ddc081a1SVenkatesh Pallipadi */ 139ddc081a1SVenkatesh Pallipadi smp_mb(); 14071e93d15SVenki Pallipadi if (!need_resched()) { 141ddc081a1SVenkatesh Pallipadi safe_halt(); 14271e93d15SVenki Pallipadi local_irq_disable(); 14371e93d15SVenki Pallipadi } 144ddc081a1SVenkatesh Pallipadi current_thread_info()->status |= TS_POLLING; 145ddc081a1SVenkatesh Pallipadi } 146ddc081a1SVenkatesh Pallipadi 147169a0abbSThomas Gleixner #ifdef ARCH_APICTIMER_STOPS_ON_C3 148169a0abbSThomas Gleixner 149169a0abbSThomas Gleixner /* 150169a0abbSThomas Gleixner * Some BIOS implementations switch to C3 in the published C2 state. 151296d93cdSLinus Torvalds * This seems to be a common problem on AMD boxen, but other vendors 152296d93cdSLinus Torvalds * are affected too. We pick the most conservative approach: we assume 153296d93cdSLinus Torvalds * that the local APIC stops in both C2 and C3. 154169a0abbSThomas Gleixner */ 1557e275cc4SLen Brown static void lapic_timer_check_state(int state, struct acpi_processor *pr, 156169a0abbSThomas Gleixner struct acpi_processor_cx *cx) 157169a0abbSThomas Gleixner { 158169a0abbSThomas Gleixner struct acpi_processor_power *pwr = &pr->power; 159e585bef8SThomas Gleixner u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; 160169a0abbSThomas Gleixner 161db954b58SVenkatesh Pallipadi if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) 162db954b58SVenkatesh Pallipadi return; 163db954b58SVenkatesh Pallipadi 16402c68a02SLen Brown if (amd_e400_c1e_detected) 16587ad57baSShaohua Li type = ACPI_STATE_C1; 16687ad57baSShaohua Li 167169a0abbSThomas Gleixner /* 168169a0abbSThomas Gleixner * Check, if one of the previous states already marked the lapic 169169a0abbSThomas Gleixner * unstable 170169a0abbSThomas Gleixner */ 171169a0abbSThomas Gleixner if (pwr->timer_broadcast_on_state < state) 172169a0abbSThomas Gleixner return; 173169a0abbSThomas Gleixner 174e585bef8SThomas Gleixner if (cx->type >= type) 175169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = state; 176169a0abbSThomas Gleixner } 177169a0abbSThomas Gleixner 178918aae42SHidetoshi Seto static void __lapic_timer_propagate_broadcast(void *arg) 179169a0abbSThomas Gleixner { 180f833bab8SSuresh Siddha struct acpi_processor *pr = (struct acpi_processor *) arg; 181e9e2cdb4SThomas Gleixner unsigned long reason; 182e9e2cdb4SThomas Gleixner 183e9e2cdb4SThomas Gleixner reason = pr->power.timer_broadcast_on_state < INT_MAX ? 184e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; 185e9e2cdb4SThomas Gleixner 186e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 187e9e2cdb4SThomas Gleixner } 188e9e2cdb4SThomas Gleixner 189918aae42SHidetoshi Seto static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) 190918aae42SHidetoshi Seto { 191918aae42SHidetoshi Seto smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, 192918aae42SHidetoshi Seto (void *)pr, 1); 193918aae42SHidetoshi Seto } 194918aae42SHidetoshi Seto 195e9e2cdb4SThomas Gleixner /* Power(C) State timer broadcast control */ 1967e275cc4SLen Brown static void lapic_timer_state_broadcast(struct acpi_processor *pr, 197e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 198e9e2cdb4SThomas Gleixner int broadcast) 199e9e2cdb4SThomas Gleixner { 200e9e2cdb4SThomas Gleixner int state = cx - pr->power.states; 201e9e2cdb4SThomas Gleixner 202e9e2cdb4SThomas Gleixner if (state >= pr->power.timer_broadcast_on_state) { 203e9e2cdb4SThomas Gleixner unsigned long reason; 204e9e2cdb4SThomas Gleixner 205e9e2cdb4SThomas Gleixner reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : 206e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_EXIT; 207e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 208e9e2cdb4SThomas Gleixner } 209169a0abbSThomas Gleixner } 210169a0abbSThomas Gleixner 211169a0abbSThomas Gleixner #else 212169a0abbSThomas Gleixner 2137e275cc4SLen Brown static void lapic_timer_check_state(int state, struct acpi_processor *pr, 214169a0abbSThomas Gleixner struct acpi_processor_cx *cstate) { } 2157e275cc4SLen Brown static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } 2167e275cc4SLen Brown static void lapic_timer_state_broadcast(struct acpi_processor *pr, 217e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 218e9e2cdb4SThomas Gleixner int broadcast) 219e9e2cdb4SThomas Gleixner { 220e9e2cdb4SThomas Gleixner } 221169a0abbSThomas Gleixner 222169a0abbSThomas Gleixner #endif 223169a0abbSThomas Gleixner 224b04e7bdbSThomas Gleixner /* 225b04e7bdbSThomas Gleixner * Suspend / resume control 226b04e7bdbSThomas Gleixner */ 227815ab0fdSLen Brown static u32 saved_bm_rld; 228815ab0fdSLen Brown 229815ab0fdSLen Brown static void acpi_idle_bm_rld_save(void) 230815ab0fdSLen Brown { 231815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 232815ab0fdSLen Brown } 233815ab0fdSLen Brown static void acpi_idle_bm_rld_restore(void) 234815ab0fdSLen Brown { 235815ab0fdSLen Brown u32 resumed_bm_rld; 236815ab0fdSLen Brown 237815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 238815ab0fdSLen Brown 239815ab0fdSLen Brown if (resumed_bm_rld != saved_bm_rld) 240815ab0fdSLen Brown acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 241815ab0fdSLen Brown } 242b04e7bdbSThomas Gleixner 243b04e7bdbSThomas Gleixner int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) 244b04e7bdbSThomas Gleixner { 245815ab0fdSLen Brown acpi_idle_bm_rld_save(); 246b04e7bdbSThomas Gleixner return 0; 247b04e7bdbSThomas Gleixner } 248b04e7bdbSThomas Gleixner 249b04e7bdbSThomas Gleixner int acpi_processor_resume(struct acpi_device * device) 250b04e7bdbSThomas Gleixner { 251815ab0fdSLen Brown acpi_idle_bm_rld_restore(); 252b04e7bdbSThomas Gleixner return 0; 253b04e7bdbSThomas Gleixner } 254b04e7bdbSThomas Gleixner 255592913ecSJohn Stultz #if defined(CONFIG_X86) 256520daf72SLen Brown static void tsc_check_state(int state) 257ddb25f9aSAndi Kleen { 258ddb25f9aSAndi Kleen switch (boot_cpu_data.x86_vendor) { 259ddb25f9aSAndi Kleen case X86_VENDOR_AMD: 26040fb1715SVenki Pallipadi case X86_VENDOR_INTEL: 261ddb25f9aSAndi Kleen /* 262ddb25f9aSAndi Kleen * AMD Fam10h TSC will tick in all 263ddb25f9aSAndi Kleen * C/P/S0/S1 states when this bit is set. 264ddb25f9aSAndi Kleen */ 26540fb1715SVenki Pallipadi if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) 266520daf72SLen Brown return; 26740fb1715SVenki Pallipadi 268ddb25f9aSAndi Kleen /*FALL THROUGH*/ 269ddb25f9aSAndi Kleen default: 270520daf72SLen Brown /* TSC could halt in idle, so notify users */ 271520daf72SLen Brown if (state > ACPI_STATE_C1) 272520daf72SLen Brown mark_tsc_unstable("TSC halts in idle"); 273ddb25f9aSAndi Kleen } 274ddb25f9aSAndi Kleen } 275520daf72SLen Brown #else 276520daf72SLen Brown static void tsc_check_state(int state) { return; } 277ddb25f9aSAndi Kleen #endif 278ddb25f9aSAndi Kleen 2791da177e4SLinus Torvalds static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) 2801da177e4SLinus Torvalds { 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds if (!pr) 283d550d98dSPatrick Mochel return -EINVAL; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds if (!pr->pblk) 286d550d98dSPatrick Mochel return -ENODEV; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* if info is obtained from pblk/fadt, type equals state */ 2891da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; 2901da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; 2911da177e4SLinus Torvalds 2924c033552SVenkatesh Pallipadi #ifndef CONFIG_HOTPLUG_CPU 2934c033552SVenkatesh Pallipadi /* 2944c033552SVenkatesh Pallipadi * Check for P_LVL2_UP flag before entering C2 and above on 2954c033552SVenkatesh Pallipadi * an SMP system. 2964c033552SVenkatesh Pallipadi */ 297ad71860aSAlexey Starikovskiy if ((num_online_cpus() > 1) && 298cee324b1SAlexey Starikovskiy !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 299d550d98dSPatrick Mochel return -ENODEV; 3004c033552SVenkatesh Pallipadi #endif 3014c033552SVenkatesh Pallipadi 3021da177e4SLinus Torvalds /* determine C2 and C3 address from pblk */ 3031da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; 3041da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* determine latencies from FADT */ 307cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; 308cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; 3091da177e4SLinus Torvalds 3105d76b6f6SLen Brown /* 3115d76b6f6SLen Brown * FADT specified C2 latency must be less than or equal to 3125d76b6f6SLen Brown * 100 microseconds. 3135d76b6f6SLen Brown */ 3145d76b6f6SLen Brown if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { 3155d76b6f6SLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, 3165d76b6f6SLen Brown "C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency)); 3175d76b6f6SLen Brown /* invalidate C2 */ 3185d76b6f6SLen Brown pr->power.states[ACPI_STATE_C2].address = 0; 3195d76b6f6SLen Brown } 3205d76b6f6SLen Brown 321a6d72c18SLen Brown /* 322a6d72c18SLen Brown * FADT supplied C3 latency must be less than or equal to 323a6d72c18SLen Brown * 1000 microseconds. 324a6d72c18SLen Brown */ 325a6d72c18SLen Brown if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { 326a6d72c18SLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, 327a6d72c18SLen Brown "C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency)); 328a6d72c18SLen Brown /* invalidate C3 */ 329a6d72c18SLen Brown pr->power.states[ACPI_STATE_C3].address = 0; 330a6d72c18SLen Brown } 331a6d72c18SLen Brown 3321da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 3331da177e4SLinus Torvalds "lvl2[0x%08x] lvl3[0x%08x]\n", 3341da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address, 3351da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address)); 3361da177e4SLinus Torvalds 337d550d98dSPatrick Mochel return 0; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 340991528d7SVenkatesh Pallipadi static int acpi_processor_get_power_info_default(struct acpi_processor *pr) 341acf05f4bSVenkatesh Pallipadi { 342991528d7SVenkatesh Pallipadi if (!pr->power.states[ACPI_STATE_C1].valid) { 343cf824788SJanosch Machowinski /* set the first C-State to C1 */ 344991528d7SVenkatesh Pallipadi /* all processors need to support C1 */ 345acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; 346acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].valid = 1; 3470fda6b40SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; 348991528d7SVenkatesh Pallipadi } 349991528d7SVenkatesh Pallipadi /* the C0 state only exists as a filler in our array */ 350991528d7SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C0].valid = 1; 351d550d98dSPatrick Mochel return 0; 352acf05f4bSVenkatesh Pallipadi } 353acf05f4bSVenkatesh Pallipadi 3541da177e4SLinus Torvalds static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds acpi_status status = 0; 357439913ffSLin Ming u64 count; 358cf824788SJanosch Machowinski int current_count; 3591da177e4SLinus Torvalds int i; 3601da177e4SLinus Torvalds struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 3611da177e4SLinus Torvalds union acpi_object *cst; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds if (nocst) 365d550d98dSPatrick Mochel return -ENODEV; 3661da177e4SLinus Torvalds 367991528d7SVenkatesh Pallipadi current_count = 0; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); 3701da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 3711da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); 372d550d98dSPatrick Mochel return -ENODEV; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 37550dd0969SJan Engelhardt cst = buffer.pointer; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* There must be at least 2 elements */ 3781da177e4SLinus Torvalds if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { 3796468463aSLen Brown printk(KERN_ERR PREFIX "not enough elements in _CST\n"); 3801da177e4SLinus Torvalds status = -EFAULT; 3811da177e4SLinus Torvalds goto end; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds count = cst->package.elements[0].integer.value; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* Validate number of power states. */ 3871da177e4SLinus Torvalds if (count < 1 || count != cst->package.count - 1) { 3886468463aSLen Brown printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); 3891da177e4SLinus Torvalds status = -EFAULT; 3901da177e4SLinus Torvalds goto end; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* Tell driver that at least _CST is supported. */ 3941da177e4SLinus Torvalds pr->flags.has_cst = 1; 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds for (i = 1; i <= count; i++) { 3971da177e4SLinus Torvalds union acpi_object *element; 3981da177e4SLinus Torvalds union acpi_object *obj; 3991da177e4SLinus Torvalds struct acpi_power_register *reg; 4001da177e4SLinus Torvalds struct acpi_processor_cx cx; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds memset(&cx, 0, sizeof(cx)); 4031da177e4SLinus Torvalds 40450dd0969SJan Engelhardt element = &(cst->package.elements[i]); 4051da177e4SLinus Torvalds if (element->type != ACPI_TYPE_PACKAGE) 4061da177e4SLinus Torvalds continue; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds if (element->package.count != 4) 4091da177e4SLinus Torvalds continue; 4101da177e4SLinus Torvalds 41150dd0969SJan Engelhardt obj = &(element->package.elements[0]); 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_BUFFER) 4141da177e4SLinus Torvalds continue; 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds reg = (struct acpi_power_register *)obj->buffer.pointer; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && 4191da177e4SLinus Torvalds (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) 4201da177e4SLinus Torvalds continue; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* There should be an easy way to extract an integer... */ 42350dd0969SJan Engelhardt obj = &(element->package.elements[1]); 4241da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4251da177e4SLinus Torvalds continue; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds cx.type = obj->integer.value; 428991528d7SVenkatesh Pallipadi /* 429991528d7SVenkatesh Pallipadi * Some buggy BIOSes won't list C1 in _CST - 430991528d7SVenkatesh Pallipadi * Let acpi_processor_get_power_info_default() handle them later 431991528d7SVenkatesh Pallipadi */ 432991528d7SVenkatesh Pallipadi if (i == 1 && cx.type != ACPI_STATE_C1) 433991528d7SVenkatesh Pallipadi current_count++; 4341da177e4SLinus Torvalds 435991528d7SVenkatesh Pallipadi cx.address = reg->address; 436991528d7SVenkatesh Pallipadi cx.index = current_count + 1; 4371da177e4SLinus Torvalds 438bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_SYSTEMIO; 439991528d7SVenkatesh Pallipadi if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 440991528d7SVenkatesh Pallipadi if (acpi_processor_ffh_cstate_probe 441991528d7SVenkatesh Pallipadi (pr->id, &cx, reg) == 0) { 442bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_FFH; 443bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx.type == ACPI_STATE_C1) { 444991528d7SVenkatesh Pallipadi /* 445991528d7SVenkatesh Pallipadi * C1 is a special case where FIXED_HARDWARE 446991528d7SVenkatesh Pallipadi * can be handled in non-MWAIT way as well. 447991528d7SVenkatesh Pallipadi * In that case, save this _CST entry info. 448991528d7SVenkatesh Pallipadi * Otherwise, ignore this info and continue. 449991528d7SVenkatesh Pallipadi */ 450bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_HALT; 4514fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 452bc71bec9Svenkatesh.pallipadi@intel.com } else { 4531da177e4SLinus Torvalds continue; 454991528d7SVenkatesh Pallipadi } 455da5e09a1SZhao Yakui if (cx.type == ACPI_STATE_C1 && 456d1896049SThomas Renninger (boot_option_idle_override == IDLE_NOMWAIT)) { 457c1e3b377SZhao Yakui /* 458c1e3b377SZhao Yakui * In most cases the C1 space_id obtained from 459c1e3b377SZhao Yakui * _CST object is FIXED_HARDWARE access mode. 460c1e3b377SZhao Yakui * But when the option of idle=halt is added, 461c1e3b377SZhao Yakui * the entry_method type should be changed from 462c1e3b377SZhao Yakui * CSTATE_FFH to CSTATE_HALT. 463da5e09a1SZhao Yakui * When the option of idle=nomwait is added, 464da5e09a1SZhao Yakui * the C1 entry_method type should be 465da5e09a1SZhao Yakui * CSTATE_HALT. 466c1e3b377SZhao Yakui */ 467c1e3b377SZhao Yakui cx.entry_method = ACPI_CSTATE_HALT; 468c1e3b377SZhao Yakui snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 469c1e3b377SZhao Yakui } 4704fcb2fcdSVenkatesh Pallipadi } else { 4714fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 4724fcb2fcdSVenkatesh Pallipadi cx.address); 473991528d7SVenkatesh Pallipadi } 4741da177e4SLinus Torvalds 4750fda6b40SVenkatesh Pallipadi if (cx.type == ACPI_STATE_C1) { 4760fda6b40SVenkatesh Pallipadi cx.valid = 1; 4770fda6b40SVenkatesh Pallipadi } 4784fcb2fcdSVenkatesh Pallipadi 47950dd0969SJan Engelhardt obj = &(element->package.elements[2]); 4801da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4811da177e4SLinus Torvalds continue; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds cx.latency = obj->integer.value; 4841da177e4SLinus Torvalds 48550dd0969SJan Engelhardt obj = &(element->package.elements[3]); 4861da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4871da177e4SLinus Torvalds continue; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds cx.power = obj->integer.value; 4901da177e4SLinus Torvalds 491cf824788SJanosch Machowinski current_count++; 492cf824788SJanosch Machowinski memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); 493cf824788SJanosch Machowinski 494cf824788SJanosch Machowinski /* 495cf824788SJanosch Machowinski * We support total ACPI_PROCESSOR_MAX_POWER - 1 496cf824788SJanosch Machowinski * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) 497cf824788SJanosch Machowinski */ 498cf824788SJanosch Machowinski if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { 499cf824788SJanosch Machowinski printk(KERN_WARNING 500cf824788SJanosch Machowinski "Limiting number of power states to max (%d)\n", 501cf824788SJanosch Machowinski ACPI_PROCESSOR_MAX_POWER); 502cf824788SJanosch Machowinski printk(KERN_WARNING 503cf824788SJanosch Machowinski "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); 504cf824788SJanosch Machowinski break; 505cf824788SJanosch Machowinski } 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5084be44fcdSLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", 509cf824788SJanosch Machowinski current_count)); 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* Validate number of power states discovered */ 512cf824788SJanosch Machowinski if (current_count < 2) 5136d93c648SVenkatesh Pallipadi status = -EFAULT; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds end: 51602438d87SLen Brown kfree(buffer.pointer); 5171da177e4SLinus Torvalds 518d550d98dSPatrick Mochel return status; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5214be44fcdSLen Brown static void acpi_processor_power_verify_c3(struct acpi_processor *pr, 5221da177e4SLinus Torvalds struct acpi_processor_cx *cx) 5231da177e4SLinus Torvalds { 524ee1ca48fSPallipadi, Venkatesh static int bm_check_flag = -1; 525ee1ca48fSPallipadi, Venkatesh static int bm_control_flag = -1; 52602df8b93SVenkatesh Pallipadi 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds if (!cx->address) 529d550d98dSPatrick Mochel return; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds /* 5321da177e4SLinus Torvalds * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) 5331da177e4SLinus Torvalds * DMA transfers are used by any ISA device to avoid livelock. 5341da177e4SLinus Torvalds * Note that we could disable Type-F DMA (as recommended by 5351da177e4SLinus Torvalds * the erratum), but this is known to disrupt certain ISA 5361da177e4SLinus Torvalds * devices thus we take the conservative approach. 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds else if (errata.piix4.fdma) { 5391da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 5401da177e4SLinus Torvalds "C3 not supported on PIIX4 with Type-F DMA\n")); 541d550d98dSPatrick Mochel return; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 54402df8b93SVenkatesh Pallipadi /* All the logic here assumes flags.bm_check is same across all CPUs */ 545ee1ca48fSPallipadi, Venkatesh if (bm_check_flag == -1) { 54602df8b93SVenkatesh Pallipadi /* Determine whether bm_check is needed based on CPU */ 54702df8b93SVenkatesh Pallipadi acpi_processor_power_init_bm_check(&(pr->flags), pr->id); 54802df8b93SVenkatesh Pallipadi bm_check_flag = pr->flags.bm_check; 549ee1ca48fSPallipadi, Venkatesh bm_control_flag = pr->flags.bm_control; 55002df8b93SVenkatesh Pallipadi } else { 55102df8b93SVenkatesh Pallipadi pr->flags.bm_check = bm_check_flag; 552ee1ca48fSPallipadi, Venkatesh pr->flags.bm_control = bm_control_flag; 55302df8b93SVenkatesh Pallipadi } 55402df8b93SVenkatesh Pallipadi 55502df8b93SVenkatesh Pallipadi if (pr->flags.bm_check) { 55602df8b93SVenkatesh Pallipadi if (!pr->flags.bm_control) { 557ed3110efSVenki Pallipadi if (pr->flags.has_cst != 1) { 558ed3110efSVenki Pallipadi /* bus mastering control is necessary */ 55902df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 560ed3110efSVenki Pallipadi "C3 support requires BM control\n")); 561ed3110efSVenki Pallipadi return; 562ed3110efSVenki Pallipadi } else { 563ed3110efSVenki Pallipadi /* Here we enter C3 without bus mastering */ 564ed3110efSVenki Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 565ed3110efSVenki Pallipadi "C3 support without BM control\n")); 566ed3110efSVenki Pallipadi } 56702df8b93SVenkatesh Pallipadi } 56802df8b93SVenkatesh Pallipadi } else { 56902df8b93SVenkatesh Pallipadi /* 57002df8b93SVenkatesh Pallipadi * WBINVD should be set in fadt, for C3 state to be 57102df8b93SVenkatesh Pallipadi * supported on when bm_check is not required. 57202df8b93SVenkatesh Pallipadi */ 573cee324b1SAlexey Starikovskiy if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { 57402df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 57502df8b93SVenkatesh Pallipadi "Cache invalidation should work properly" 57602df8b93SVenkatesh Pallipadi " for C3 to be enabled on SMP systems\n")); 577d550d98dSPatrick Mochel return; 57802df8b93SVenkatesh Pallipadi } 57902df8b93SVenkatesh Pallipadi } 58002df8b93SVenkatesh Pallipadi 5811da177e4SLinus Torvalds /* 5821da177e4SLinus Torvalds * Otherwise we've met all of our C3 requirements. 5831da177e4SLinus Torvalds * Normalize the C3 latency to expidite policy. Enable 5841da177e4SLinus Torvalds * checking of bus mastering status (bm_check) so we can 5851da177e4SLinus Torvalds * use this in our C3 policy 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds cx->valid = 1; 5884f86d3a8SLen Brown 5894f86d3a8SLen Brown cx->latency_ticks = cx->latency; 59031878dd8SLen Brown /* 59131878dd8SLen Brown * On older chipsets, BM_RLD needs to be set 59231878dd8SLen Brown * in order for Bus Master activity to wake the 59331878dd8SLen Brown * system from C3. Newer chipsets handle DMA 59431878dd8SLen Brown * during C3 automatically and BM_RLD is a NOP. 59531878dd8SLen Brown * In either case, the proper way to 59631878dd8SLen Brown * handle BM_RLD is to set it and leave it set. 59731878dd8SLen Brown */ 59850ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); 5991da177e4SLinus Torvalds 600d550d98dSPatrick Mochel return; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds static int acpi_processor_power_verify(struct acpi_processor *pr) 6041da177e4SLinus Torvalds { 6051da177e4SLinus Torvalds unsigned int i; 6061da177e4SLinus Torvalds unsigned int working = 0; 6076eb0a0fdSVenkatesh Pallipadi 608169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = INT_MAX; 6096eb0a0fdSVenkatesh Pallipadi 610a0bf284bSLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 6111da177e4SLinus Torvalds struct acpi_processor_cx *cx = &pr->power.states[i]; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds switch (cx->type) { 6141da177e4SLinus Torvalds case ACPI_STATE_C1: 6151da177e4SLinus Torvalds cx->valid = 1; 6161da177e4SLinus Torvalds break; 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds case ACPI_STATE_C2: 619d22edd29SLen Brown if (!cx->address) 620d22edd29SLen Brown break; 621d22edd29SLen Brown cx->valid = 1; 622d22edd29SLen Brown cx->latency_ticks = cx->latency; /* Normalize latency */ 6231da177e4SLinus Torvalds break; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds case ACPI_STATE_C3: 6261da177e4SLinus Torvalds acpi_processor_power_verify_c3(pr, cx); 6271da177e4SLinus Torvalds break; 6281da177e4SLinus Torvalds } 6297e275cc4SLen Brown if (!cx->valid) 6307e275cc4SLen Brown continue; 6311da177e4SLinus Torvalds 6327e275cc4SLen Brown lapic_timer_check_state(i, pr, cx); 6337e275cc4SLen Brown tsc_check_state(cx->type); 6341da177e4SLinus Torvalds working++; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 637918aae42SHidetoshi Seto lapic_timer_propagate_broadcast(pr); 638bd663347SAndi Kleen 6391da177e4SLinus Torvalds return (working); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6424be44fcdSLen Brown static int acpi_processor_get_power_info(struct acpi_processor *pr) 6431da177e4SLinus Torvalds { 6441da177e4SLinus Torvalds unsigned int i; 6451da177e4SLinus Torvalds int result; 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* NOTE: the idle thread may not be running while calling 6491da177e4SLinus Torvalds * this function */ 6501da177e4SLinus Torvalds 651991528d7SVenkatesh Pallipadi /* Zero initialize all the C-states info. */ 652991528d7SVenkatesh Pallipadi memset(pr->power.states, 0, sizeof(pr->power.states)); 653991528d7SVenkatesh Pallipadi 6541da177e4SLinus Torvalds result = acpi_processor_get_power_info_cst(pr); 6556d93c648SVenkatesh Pallipadi if (result == -ENODEV) 656c5a114f1SDarrick J. Wong result = acpi_processor_get_power_info_fadt(pr); 6576d93c648SVenkatesh Pallipadi 658991528d7SVenkatesh Pallipadi if (result) 659991528d7SVenkatesh Pallipadi return result; 660991528d7SVenkatesh Pallipadi 661991528d7SVenkatesh Pallipadi acpi_processor_get_power_info_default(pr); 662991528d7SVenkatesh Pallipadi 663cf824788SJanosch Machowinski pr->power.count = acpi_processor_power_verify(pr); 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* 6661da177e4SLinus Torvalds * if one state of type C2 or C3 is available, mark this 6671da177e4SLinus Torvalds * CPU as being "idle manageable" 6681da177e4SLinus Torvalds */ 6691da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 670acf05f4bSVenkatesh Pallipadi if (pr->power.states[i].valid) { 6711da177e4SLinus Torvalds pr->power.count = i; 6722203d6edSLinus Torvalds if (pr->power.states[i].type >= ACPI_STATE_C2) 6731da177e4SLinus Torvalds pr->flags.power = 1; 6741da177e4SLinus Torvalds } 675acf05f4bSVenkatesh Pallipadi } 6761da177e4SLinus Torvalds 677d550d98dSPatrick Mochel return 0; 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds 6804f86d3a8SLen Brown /** 6814f86d3a8SLen Brown * acpi_idle_bm_check - checks if bus master activity was detected 6824f86d3a8SLen Brown */ 6834f86d3a8SLen Brown static int acpi_idle_bm_check(void) 6844f86d3a8SLen Brown { 6854f86d3a8SLen Brown u32 bm_status = 0; 6864f86d3a8SLen Brown 687d3e7e99fSLen Brown if (bm_check_disable) 688d3e7e99fSLen Brown return 0; 689d3e7e99fSLen Brown 69050ffba1bSBob Moore acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); 6914f86d3a8SLen Brown if (bm_status) 69250ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); 6934f86d3a8SLen Brown /* 6944f86d3a8SLen Brown * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect 6954f86d3a8SLen Brown * the true state of bus mastering activity; forcing us to 6964f86d3a8SLen Brown * manually check the BMIDEA bit of each IDE channel. 6974f86d3a8SLen Brown */ 6984f86d3a8SLen Brown else if (errata.piix4.bmisx) { 6994f86d3a8SLen Brown if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) 7004f86d3a8SLen Brown || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) 7014f86d3a8SLen Brown bm_status = 1; 7024f86d3a8SLen Brown } 7034f86d3a8SLen Brown return bm_status; 7044f86d3a8SLen Brown } 7054f86d3a8SLen Brown 7064f86d3a8SLen Brown /** 7074f86d3a8SLen Brown * acpi_idle_do_entry - a helper function that does C2 and C3 type entry 7084f86d3a8SLen Brown * @cx: cstate data 709bc71bec9Svenkatesh.pallipadi@intel.com * 710bc71bec9Svenkatesh.pallipadi@intel.com * Caller disables interrupt before call and enables interrupt after return. 7114f86d3a8SLen Brown */ 7124f86d3a8SLen Brown static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) 7134f86d3a8SLen Brown { 714dcf30997SSteven Rostedt /* Don't trace irqs off for idle */ 715dcf30997SSteven Rostedt stop_critical_timings(); 716bc71bec9Svenkatesh.pallipadi@intel.com if (cx->entry_method == ACPI_CSTATE_FFH) { 7174f86d3a8SLen Brown /* Call into architectural FFH based C-state */ 7184f86d3a8SLen Brown acpi_processor_ffh_cstate_enter(cx); 719bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx->entry_method == ACPI_CSTATE_HALT) { 720bc71bec9Svenkatesh.pallipadi@intel.com acpi_safe_halt(); 7214f86d3a8SLen Brown } else { 7224f86d3a8SLen Brown /* IO port based C-state */ 7234f86d3a8SLen Brown inb(cx->address); 7244f86d3a8SLen Brown /* Dummy wait op - must do something useless after P_LVL2 read 7254f86d3a8SLen Brown because chipsets cannot guarantee that STPCLK# signal 7264f86d3a8SLen Brown gets asserted in time to freeze execution properly. */ 727cfa806f0SAndi Kleen inl(acpi_gbl_FADT.xpm_timer_block.address); 7284f86d3a8SLen Brown } 729dcf30997SSteven Rostedt start_critical_timings(); 7304f86d3a8SLen Brown } 7314f86d3a8SLen Brown 7324f86d3a8SLen Brown /** 7334f86d3a8SLen Brown * acpi_idle_enter_c1 - enters an ACPI C1 state-type 7344f86d3a8SLen Brown * @dev: the target CPU 73546bcfad7SDeepthi Dharwar * @drv: cpuidle driver containing cpuidle state info 736e978aa7dSDeepthi Dharwar * @index: index of target state 7374f86d3a8SLen Brown * 7384f86d3a8SLen Brown * This is equivalent to the HALT instruction. 7394f86d3a8SLen Brown */ 7404f86d3a8SLen Brown static int acpi_idle_enter_c1(struct cpuidle_device *dev, 74146bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 7424f86d3a8SLen Brown { 743ff69f2bbSalex.shi ktime_t kt1, kt2; 744ff69f2bbSalex.shi s64 idle_time; 7454f86d3a8SLen Brown struct acpi_processor *pr; 7464202735eSDeepthi Dharwar struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; 7474202735eSDeepthi Dharwar struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); 7489b12e18cSvenkatesh.pallipadi@intel.com 7494a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 750e978aa7dSDeepthi Dharwar dev->last_residency = 0; 7514f86d3a8SLen Brown 7524f86d3a8SLen Brown if (unlikely(!pr)) 753e978aa7dSDeepthi Dharwar return -EINVAL; 7544f86d3a8SLen Brown 7552e906655Svenkatesh.pallipadi@intel.com local_irq_disable(); 756b077fbadSVenkatesh Pallipadi 7577e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 758ff69f2bbSalex.shi kt1 = ktime_get_real(); 759bc71bec9Svenkatesh.pallipadi@intel.com acpi_idle_do_entry(cx); 760ff69f2bbSalex.shi kt2 = ktime_get_real(); 761ff69f2bbSalex.shi idle_time = ktime_to_us(ktime_sub(kt2, kt1)); 7624f86d3a8SLen Brown 763e978aa7dSDeepthi Dharwar /* Update device last_residency*/ 764e978aa7dSDeepthi Dharwar dev->last_residency = (int)idle_time; 765e978aa7dSDeepthi Dharwar 7662e906655Svenkatesh.pallipadi@intel.com local_irq_enable(); 7674f86d3a8SLen Brown cx->usage++; 7687e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 7694f86d3a8SLen Brown 770e978aa7dSDeepthi Dharwar return index; 7714f86d3a8SLen Brown } 7724f86d3a8SLen Brown 7731a022e3fSBoris Ostrovsky 7741a022e3fSBoris Ostrovsky /** 7751a022e3fSBoris Ostrovsky * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) 7761a022e3fSBoris Ostrovsky * @dev: the target CPU 7771a022e3fSBoris Ostrovsky * @index: the index of suggested state 7781a022e3fSBoris Ostrovsky */ 7791a022e3fSBoris Ostrovsky static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) 7801a022e3fSBoris Ostrovsky { 7811a022e3fSBoris Ostrovsky struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; 7821a022e3fSBoris Ostrovsky struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); 7831a022e3fSBoris Ostrovsky 7841a022e3fSBoris Ostrovsky ACPI_FLUSH_CPU_CACHE(); 7851a022e3fSBoris Ostrovsky 7861a022e3fSBoris Ostrovsky while (1) { 7871a022e3fSBoris Ostrovsky 7881a022e3fSBoris Ostrovsky if (cx->entry_method == ACPI_CSTATE_HALT) 78954f70077SLuck, Tony safe_halt(); 7901a022e3fSBoris Ostrovsky else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { 7911a022e3fSBoris Ostrovsky inb(cx->address); 7921a022e3fSBoris Ostrovsky /* See comment in acpi_idle_do_entry() */ 7931a022e3fSBoris Ostrovsky inl(acpi_gbl_FADT.xpm_timer_block.address); 7941a022e3fSBoris Ostrovsky } else 7951a022e3fSBoris Ostrovsky return -ENODEV; 7961a022e3fSBoris Ostrovsky } 7971a022e3fSBoris Ostrovsky 7981a022e3fSBoris Ostrovsky /* Never reached */ 7991a022e3fSBoris Ostrovsky return 0; 8001a022e3fSBoris Ostrovsky } 8011a022e3fSBoris Ostrovsky 8024f86d3a8SLen Brown /** 8034f86d3a8SLen Brown * acpi_idle_enter_simple - enters an ACPI state without BM handling 8044f86d3a8SLen Brown * @dev: the target CPU 80546bcfad7SDeepthi Dharwar * @drv: cpuidle driver with cpuidle state information 806e978aa7dSDeepthi Dharwar * @index: the index of suggested state 8074f86d3a8SLen Brown */ 8084f86d3a8SLen Brown static int acpi_idle_enter_simple(struct cpuidle_device *dev, 80946bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 8104f86d3a8SLen Brown { 8114f86d3a8SLen Brown struct acpi_processor *pr; 8124202735eSDeepthi Dharwar struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; 8134202735eSDeepthi Dharwar struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); 814ff69f2bbSalex.shi ktime_t kt1, kt2; 8152da513f5SVenkatesh Pallipadi s64 idle_time_ns; 816ff69f2bbSalex.shi s64 idle_time; 81750629118SVenkatesh Pallipadi 8184a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 819e978aa7dSDeepthi Dharwar dev->last_residency = 0; 8204f86d3a8SLen Brown 8214f86d3a8SLen Brown if (unlikely(!pr)) 822e978aa7dSDeepthi Dharwar return -EINVAL; 823e196441bSLen Brown 8244f86d3a8SLen Brown local_irq_disable(); 82502cf4f98SLen Brown 826d306ebc2SPallipadi, Venkatesh if (cx->entry_method != ACPI_CSTATE_FFH) { 8274f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 8284f86d3a8SLen Brown /* 8294f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 8304f86d3a8SLen Brown * NEED_RESCHED: 8314f86d3a8SLen Brown */ 8324f86d3a8SLen Brown smp_mb(); 8334f86d3a8SLen Brown 8344f86d3a8SLen Brown if (unlikely(need_resched())) { 8354f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 8364f86d3a8SLen Brown local_irq_enable(); 837e978aa7dSDeepthi Dharwar return -EINVAL; 8384f86d3a8SLen Brown } 83902cf4f98SLen Brown } 8404f86d3a8SLen Brown 841e17bcb43SThomas Gleixner /* 842e17bcb43SThomas Gleixner * Must be done before busmaster disable as we might need to 843e17bcb43SThomas Gleixner * access HPET ! 844e17bcb43SThomas Gleixner */ 8457e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 846e17bcb43SThomas Gleixner 8474f86d3a8SLen Brown if (cx->type == ACPI_STATE_C3) 8484f86d3a8SLen Brown ACPI_FLUSH_CPU_CACHE(); 8494f86d3a8SLen Brown 850ff69f2bbSalex.shi kt1 = ktime_get_real(); 85150629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 85250629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 8534f86d3a8SLen Brown acpi_idle_do_entry(cx); 854ff69f2bbSalex.shi kt2 = ktime_get_real(); 8552da513f5SVenkatesh Pallipadi idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); 8562da513f5SVenkatesh Pallipadi idle_time = idle_time_ns; 8572da513f5SVenkatesh Pallipadi do_div(idle_time, NSEC_PER_USEC); 8584f86d3a8SLen Brown 859e978aa7dSDeepthi Dharwar /* Update device last_residency*/ 860e978aa7dSDeepthi Dharwar dev->last_residency = (int)idle_time; 861e978aa7dSDeepthi Dharwar 86250629118SVenkatesh Pallipadi /* Tell the scheduler how much we idled: */ 8632da513f5SVenkatesh Pallipadi sched_clock_idle_wakeup_event(idle_time_ns); 8644f86d3a8SLen Brown 8654f86d3a8SLen Brown local_irq_enable(); 86602cf4f98SLen Brown if (cx->entry_method != ACPI_CSTATE_FFH) 8674f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 8684f86d3a8SLen Brown 8694f86d3a8SLen Brown cx->usage++; 8704f86d3a8SLen Brown 8717e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 872bceefad5SVenkatesh Pallipadi cx->time += idle_time; 873e978aa7dSDeepthi Dharwar return index; 8744f86d3a8SLen Brown } 8754f86d3a8SLen Brown 8764f86d3a8SLen Brown static int c3_cpu_count; 877e12f65f7SThomas Gleixner static DEFINE_RAW_SPINLOCK(c3_lock); 8784f86d3a8SLen Brown 8794f86d3a8SLen Brown /** 8804f86d3a8SLen Brown * acpi_idle_enter_bm - enters C3 with proper BM handling 8814f86d3a8SLen Brown * @dev: the target CPU 88246bcfad7SDeepthi Dharwar * @drv: cpuidle driver containing state data 883e978aa7dSDeepthi Dharwar * @index: the index of suggested state 8844f86d3a8SLen Brown * 8854f86d3a8SLen Brown * If BM is detected, the deepest non-C3 idle state is entered instead. 8864f86d3a8SLen Brown */ 8874f86d3a8SLen Brown static int acpi_idle_enter_bm(struct cpuidle_device *dev, 88846bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 8894f86d3a8SLen Brown { 8904f86d3a8SLen Brown struct acpi_processor *pr; 8914202735eSDeepthi Dharwar struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; 8924202735eSDeepthi Dharwar struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); 893ff69f2bbSalex.shi ktime_t kt1, kt2; 8942da513f5SVenkatesh Pallipadi s64 idle_time_ns; 895ff69f2bbSalex.shi s64 idle_time; 896ff69f2bbSalex.shi 89750629118SVenkatesh Pallipadi 8984a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 899e978aa7dSDeepthi Dharwar dev->last_residency = 0; 9004f86d3a8SLen Brown 9014f86d3a8SLen Brown if (unlikely(!pr)) 902e978aa7dSDeepthi Dharwar return -EINVAL; 9034f86d3a8SLen Brown 904718be4aaSLen Brown if (!cx->bm_sts_skip && acpi_idle_bm_check()) { 90546bcfad7SDeepthi Dharwar if (drv->safe_state_index >= 0) { 90646bcfad7SDeepthi Dharwar return drv->states[drv->safe_state_index].enter(dev, 90746bcfad7SDeepthi Dharwar drv, drv->safe_state_index); 908ddc081a1SVenkatesh Pallipadi } else { 9092e906655Svenkatesh.pallipadi@intel.com local_irq_disable(); 910ddc081a1SVenkatesh Pallipadi acpi_safe_halt(); 9112e906655Svenkatesh.pallipadi@intel.com local_irq_enable(); 912e978aa7dSDeepthi Dharwar return -EINVAL; 913ddc081a1SVenkatesh Pallipadi } 914ddc081a1SVenkatesh Pallipadi } 915ddc081a1SVenkatesh Pallipadi 9164f86d3a8SLen Brown local_irq_disable(); 91702cf4f98SLen Brown 918d306ebc2SPallipadi, Venkatesh if (cx->entry_method != ACPI_CSTATE_FFH) { 9194f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 9204f86d3a8SLen Brown /* 9214f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 9224f86d3a8SLen Brown * NEED_RESCHED: 9234f86d3a8SLen Brown */ 9244f86d3a8SLen Brown smp_mb(); 9254f86d3a8SLen Brown 9264f86d3a8SLen Brown if (unlikely(need_resched())) { 9274f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 9284f86d3a8SLen Brown local_irq_enable(); 929e978aa7dSDeepthi Dharwar return -EINVAL; 9304f86d3a8SLen Brown } 93102cf4f98SLen Brown } 9324f86d3a8SLen Brown 933996520c1SVenki Pallipadi acpi_unlazy_tlb(smp_processor_id()); 934996520c1SVenki Pallipadi 93550629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 93650629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 9374f86d3a8SLen Brown /* 9384f86d3a8SLen Brown * Must be done before busmaster disable as we might need to 9394f86d3a8SLen Brown * access HPET ! 9404f86d3a8SLen Brown */ 9417e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 9424f86d3a8SLen Brown 943f461ddeaSLen Brown kt1 = ktime_get_real(); 944c9c860e5SVenkatesh Pallipadi /* 945c9c860e5SVenkatesh Pallipadi * disable bus master 946c9c860e5SVenkatesh Pallipadi * bm_check implies we need ARB_DIS 947c9c860e5SVenkatesh Pallipadi * !bm_check implies we need cache flush 948c9c860e5SVenkatesh Pallipadi * bm_control implies whether we can do ARB_DIS 949c9c860e5SVenkatesh Pallipadi * 950c9c860e5SVenkatesh Pallipadi * That leaves a case where bm_check is set and bm_control is 951c9c860e5SVenkatesh Pallipadi * not set. In that case we cannot do much, we enter C3 952c9c860e5SVenkatesh Pallipadi * without doing anything. 953c9c860e5SVenkatesh Pallipadi */ 954c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 955e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 9564f86d3a8SLen Brown c3_cpu_count++; 9574f86d3a8SLen Brown /* Disable bus master arbitration when all CPUs are in C3 */ 9584f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 95950ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); 960e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 961c9c860e5SVenkatesh Pallipadi } else if (!pr->flags.bm_check) { 962c9c860e5SVenkatesh Pallipadi ACPI_FLUSH_CPU_CACHE(); 963c9c860e5SVenkatesh Pallipadi } 9644f86d3a8SLen Brown 9654f86d3a8SLen Brown acpi_idle_do_entry(cx); 9664f86d3a8SLen Brown 9674f86d3a8SLen Brown /* Re-enable bus master arbitration */ 968c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 969e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 97050ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); 9714f86d3a8SLen Brown c3_cpu_count--; 972e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 9734f86d3a8SLen Brown } 974f461ddeaSLen Brown kt2 = ktime_get_real(); 975157317baSZhao Yakui idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1)); 9762da513f5SVenkatesh Pallipadi idle_time = idle_time_ns; 9772da513f5SVenkatesh Pallipadi do_div(idle_time, NSEC_PER_USEC); 9784f86d3a8SLen Brown 979e978aa7dSDeepthi Dharwar /* Update device last_residency*/ 980e978aa7dSDeepthi Dharwar dev->last_residency = (int)idle_time; 981e978aa7dSDeepthi Dharwar 98250629118SVenkatesh Pallipadi /* Tell the scheduler how much we idled: */ 9832da513f5SVenkatesh Pallipadi sched_clock_idle_wakeup_event(idle_time_ns); 9844f86d3a8SLen Brown 9854f86d3a8SLen Brown local_irq_enable(); 98602cf4f98SLen Brown if (cx->entry_method != ACPI_CSTATE_FFH) 9874f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 9884f86d3a8SLen Brown 9894f86d3a8SLen Brown cx->usage++; 9904f86d3a8SLen Brown 9917e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 992bceefad5SVenkatesh Pallipadi cx->time += idle_time; 993e978aa7dSDeepthi Dharwar return index; 9944f86d3a8SLen Brown } 9954f86d3a8SLen Brown 9964f86d3a8SLen Brown struct cpuidle_driver acpi_idle_driver = { 9974f86d3a8SLen Brown .name = "acpi_idle", 9984f86d3a8SLen Brown .owner = THIS_MODULE, 9994f86d3a8SLen Brown }; 10004f86d3a8SLen Brown 10014f86d3a8SLen Brown /** 100246bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE 100346bcfad7SDeepthi Dharwar * device i.e. per-cpu data 100446bcfad7SDeepthi Dharwar * 10054f86d3a8SLen Brown * @pr: the ACPI processor 10064f86d3a8SLen Brown */ 100746bcfad7SDeepthi Dharwar static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr) 10084f86d3a8SLen Brown { 10099a0b8415Svenkatesh.pallipadi@intel.com int i, count = CPUIDLE_DRIVER_STATE_START; 10104f86d3a8SLen Brown struct acpi_processor_cx *cx; 10114202735eSDeepthi Dharwar struct cpuidle_state_usage *state_usage; 10124f86d3a8SLen Brown struct cpuidle_device *dev = &pr->power.dev; 10134f86d3a8SLen Brown 10144f86d3a8SLen Brown if (!pr->flags.power_setup_done) 10154f86d3a8SLen Brown return -EINVAL; 10164f86d3a8SLen Brown 10174f86d3a8SLen Brown if (pr->flags.power == 0) { 10184f86d3a8SLen Brown return -EINVAL; 10194f86d3a8SLen Brown } 10204f86d3a8SLen Brown 1021dcb84f33SVenkatesh Pallipadi dev->cpu = pr->id; 10224fcb2fcdSVenkatesh Pallipadi 1023615dfd93SLen Brown if (max_cstate == 0) 1024615dfd93SLen Brown max_cstate = 1; 1025615dfd93SLen Brown 10264f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 10274f86d3a8SLen Brown cx = &pr->power.states[i]; 10284202735eSDeepthi Dharwar state_usage = &dev->states_usage[count]; 10294f86d3a8SLen Brown 10304f86d3a8SLen Brown if (!cx->valid) 10314f86d3a8SLen Brown continue; 10324f86d3a8SLen Brown 10334f86d3a8SLen Brown #ifdef CONFIG_HOTPLUG_CPU 10344f86d3a8SLen Brown if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 10354f86d3a8SLen Brown !pr->flags.has_cst && 10364f86d3a8SLen Brown !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 10374f86d3a8SLen Brown continue; 10384f86d3a8SLen Brown #endif 10394f86d3a8SLen Brown 10404202735eSDeepthi Dharwar cpuidle_set_statedata(state_usage, cx); 10414f86d3a8SLen Brown 104246bcfad7SDeepthi Dharwar count++; 104346bcfad7SDeepthi Dharwar if (count == CPUIDLE_STATE_MAX) 104446bcfad7SDeepthi Dharwar break; 104546bcfad7SDeepthi Dharwar } 104646bcfad7SDeepthi Dharwar 104746bcfad7SDeepthi Dharwar dev->state_count = count; 104846bcfad7SDeepthi Dharwar 104946bcfad7SDeepthi Dharwar if (!count) 105046bcfad7SDeepthi Dharwar return -EINVAL; 105146bcfad7SDeepthi Dharwar 105246bcfad7SDeepthi Dharwar return 0; 105346bcfad7SDeepthi Dharwar } 105446bcfad7SDeepthi Dharwar 105546bcfad7SDeepthi Dharwar /** 105646bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle states- prepares and configures cpuidle 105746bcfad7SDeepthi Dharwar * global state data i.e. idle routines 105846bcfad7SDeepthi Dharwar * 105946bcfad7SDeepthi Dharwar * @pr: the ACPI processor 106046bcfad7SDeepthi Dharwar */ 106146bcfad7SDeepthi Dharwar static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) 106246bcfad7SDeepthi Dharwar { 106346bcfad7SDeepthi Dharwar int i, count = CPUIDLE_DRIVER_STATE_START; 106446bcfad7SDeepthi Dharwar struct acpi_processor_cx *cx; 106546bcfad7SDeepthi Dharwar struct cpuidle_state *state; 106646bcfad7SDeepthi Dharwar struct cpuidle_driver *drv = &acpi_idle_driver; 106746bcfad7SDeepthi Dharwar 106846bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 106946bcfad7SDeepthi Dharwar return -EINVAL; 107046bcfad7SDeepthi Dharwar 107146bcfad7SDeepthi Dharwar if (pr->flags.power == 0) 107246bcfad7SDeepthi Dharwar return -EINVAL; 107346bcfad7SDeepthi Dharwar 107446bcfad7SDeepthi Dharwar drv->safe_state_index = -1; 107546bcfad7SDeepthi Dharwar for (i = 0; i < CPUIDLE_STATE_MAX; i++) { 107646bcfad7SDeepthi Dharwar drv->states[i].name[0] = '\0'; 107746bcfad7SDeepthi Dharwar drv->states[i].desc[0] = '\0'; 107846bcfad7SDeepthi Dharwar } 107946bcfad7SDeepthi Dharwar 108046bcfad7SDeepthi Dharwar if (max_cstate == 0) 108146bcfad7SDeepthi Dharwar max_cstate = 1; 108246bcfad7SDeepthi Dharwar 108346bcfad7SDeepthi Dharwar for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 108446bcfad7SDeepthi Dharwar cx = &pr->power.states[i]; 108546bcfad7SDeepthi Dharwar 108646bcfad7SDeepthi Dharwar if (!cx->valid) 108746bcfad7SDeepthi Dharwar continue; 108846bcfad7SDeepthi Dharwar 108946bcfad7SDeepthi Dharwar #ifdef CONFIG_HOTPLUG_CPU 109046bcfad7SDeepthi Dharwar if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 109146bcfad7SDeepthi Dharwar !pr->flags.has_cst && 109246bcfad7SDeepthi Dharwar !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 109346bcfad7SDeepthi Dharwar continue; 109446bcfad7SDeepthi Dharwar #endif 109546bcfad7SDeepthi Dharwar 109646bcfad7SDeepthi Dharwar state = &drv->states[count]; 10974f86d3a8SLen Brown snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); 10984fcb2fcdSVenkatesh Pallipadi strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 10994f86d3a8SLen Brown state->exit_latency = cx->latency; 11004963f620SLen Brown state->target_residency = cx->latency * latency_factor; 11014f86d3a8SLen Brown 11024f86d3a8SLen Brown state->flags = 0; 11034f86d3a8SLen Brown switch (cx->type) { 11044f86d3a8SLen Brown case ACPI_STATE_C1: 11058e92b660SVenki Pallipadi if (cx->entry_method == ACPI_CSTATE_FFH) 11069b12e18cSvenkatesh.pallipadi@intel.com state->flags |= CPUIDLE_FLAG_TIME_VALID; 11078e92b660SVenki Pallipadi 11084f86d3a8SLen Brown state->enter = acpi_idle_enter_c1; 11091a022e3fSBoris Ostrovsky state->enter_dead = acpi_idle_play_dead; 111046bcfad7SDeepthi Dharwar drv->safe_state_index = count; 11114f86d3a8SLen Brown break; 11124f86d3a8SLen Brown 11134f86d3a8SLen Brown case ACPI_STATE_C2: 11144f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 11154f86d3a8SLen Brown state->enter = acpi_idle_enter_simple; 11161a022e3fSBoris Ostrovsky state->enter_dead = acpi_idle_play_dead; 111746bcfad7SDeepthi Dharwar drv->safe_state_index = count; 11184f86d3a8SLen Brown break; 11194f86d3a8SLen Brown 11204f86d3a8SLen Brown case ACPI_STATE_C3: 11214f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 11224f86d3a8SLen Brown state->enter = pr->flags.bm_check ? 11234f86d3a8SLen Brown acpi_idle_enter_bm : 11244f86d3a8SLen Brown acpi_idle_enter_simple; 11254f86d3a8SLen Brown break; 11264f86d3a8SLen Brown } 11274f86d3a8SLen Brown 11284f86d3a8SLen Brown count++; 11299a0b8415Svenkatesh.pallipadi@intel.com if (count == CPUIDLE_STATE_MAX) 11309a0b8415Svenkatesh.pallipadi@intel.com break; 11314f86d3a8SLen Brown } 11324f86d3a8SLen Brown 113346bcfad7SDeepthi Dharwar drv->state_count = count; 11344f86d3a8SLen Brown 11354f86d3a8SLen Brown if (!count) 11364f86d3a8SLen Brown return -EINVAL; 11374f86d3a8SLen Brown 11384f86d3a8SLen Brown return 0; 11394f86d3a8SLen Brown } 11404f86d3a8SLen Brown 114146bcfad7SDeepthi Dharwar int acpi_processor_hotplug(struct acpi_processor *pr) 11424f86d3a8SLen Brown { 1143dcb84f33SVenkatesh Pallipadi int ret = 0; 11444f86d3a8SLen Brown 1145d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 114636a91358SVenkatesh Pallipadi return 0; 114736a91358SVenkatesh Pallipadi 11484f86d3a8SLen Brown if (!pr) 11494f86d3a8SLen Brown return -EINVAL; 11504f86d3a8SLen Brown 11514f86d3a8SLen Brown if (nocst) { 11524f86d3a8SLen Brown return -ENODEV; 11534f86d3a8SLen Brown } 11544f86d3a8SLen Brown 11554f86d3a8SLen Brown if (!pr->flags.power_setup_done) 11564f86d3a8SLen Brown return -ENODEV; 11574f86d3a8SLen Brown 11584f86d3a8SLen Brown cpuidle_pause_and_lock(); 11594f86d3a8SLen Brown cpuidle_disable_device(&pr->power.dev); 11604f86d3a8SLen Brown acpi_processor_get_power_info(pr); 1161dcb84f33SVenkatesh Pallipadi if (pr->flags.power) { 116246bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_cx(pr); 11634f86d3a8SLen Brown ret = cpuidle_enable_device(&pr->power.dev); 1164dcb84f33SVenkatesh Pallipadi } 11654f86d3a8SLen Brown cpuidle_resume_and_unlock(); 11664f86d3a8SLen Brown 11674f86d3a8SLen Brown return ret; 11684f86d3a8SLen Brown } 11694f86d3a8SLen Brown 117046bcfad7SDeepthi Dharwar int acpi_processor_cst_has_changed(struct acpi_processor *pr) 117146bcfad7SDeepthi Dharwar { 117246bcfad7SDeepthi Dharwar int cpu; 117346bcfad7SDeepthi Dharwar struct acpi_processor *_pr; 117446bcfad7SDeepthi Dharwar 117546bcfad7SDeepthi Dharwar if (disabled_by_idle_boot_param()) 117646bcfad7SDeepthi Dharwar return 0; 117746bcfad7SDeepthi Dharwar 117846bcfad7SDeepthi Dharwar if (!pr) 117946bcfad7SDeepthi Dharwar return -EINVAL; 118046bcfad7SDeepthi Dharwar 118146bcfad7SDeepthi Dharwar if (nocst) 118246bcfad7SDeepthi Dharwar return -ENODEV; 118346bcfad7SDeepthi Dharwar 118446bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 118546bcfad7SDeepthi Dharwar return -ENODEV; 118646bcfad7SDeepthi Dharwar 118746bcfad7SDeepthi Dharwar /* 118846bcfad7SDeepthi Dharwar * FIXME: Design the ACPI notification to make it once per 118946bcfad7SDeepthi Dharwar * system instead of once per-cpu. This condition is a hack 119046bcfad7SDeepthi Dharwar * to make the code that updates C-States be called once. 119146bcfad7SDeepthi Dharwar */ 119246bcfad7SDeepthi Dharwar 119346bcfad7SDeepthi Dharwar if (smp_processor_id() == 0 && 119446bcfad7SDeepthi Dharwar cpuidle_get_driver() == &acpi_idle_driver) { 119546bcfad7SDeepthi Dharwar 119646bcfad7SDeepthi Dharwar cpuidle_pause_and_lock(); 119746bcfad7SDeepthi Dharwar /* Protect against cpu-hotplug */ 119846bcfad7SDeepthi Dharwar get_online_cpus(); 119946bcfad7SDeepthi Dharwar 120046bcfad7SDeepthi Dharwar /* Disable all cpuidle devices */ 120146bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 120246bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 120346bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 120446bcfad7SDeepthi Dharwar continue; 120546bcfad7SDeepthi Dharwar cpuidle_disable_device(&_pr->power.dev); 120646bcfad7SDeepthi Dharwar } 120746bcfad7SDeepthi Dharwar 120846bcfad7SDeepthi Dharwar /* Populate Updated C-state information */ 120946bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 121046bcfad7SDeepthi Dharwar 121146bcfad7SDeepthi Dharwar /* Enable all cpuidle devices */ 121246bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 121346bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 121446bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 121546bcfad7SDeepthi Dharwar continue; 121646bcfad7SDeepthi Dharwar acpi_processor_get_power_info(_pr); 121746bcfad7SDeepthi Dharwar if (_pr->flags.power) { 121846bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_cx(_pr); 121946bcfad7SDeepthi Dharwar cpuidle_enable_device(&_pr->power.dev); 122046bcfad7SDeepthi Dharwar } 122146bcfad7SDeepthi Dharwar } 122246bcfad7SDeepthi Dharwar put_online_cpus(); 122346bcfad7SDeepthi Dharwar cpuidle_resume_and_unlock(); 122446bcfad7SDeepthi Dharwar } 122546bcfad7SDeepthi Dharwar 122646bcfad7SDeepthi Dharwar return 0; 122746bcfad7SDeepthi Dharwar } 122846bcfad7SDeepthi Dharwar 122946bcfad7SDeepthi Dharwar static int acpi_processor_registered; 123046bcfad7SDeepthi Dharwar 12317af8b660SPierre Ossman int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, 12324be44fcdSLen Brown struct acpi_device *device) 12331da177e4SLinus Torvalds { 12341da177e4SLinus Torvalds acpi_status status = 0; 123546bcfad7SDeepthi Dharwar int retval; 1236b6835052SAndreas Mohr static int first_run; 12371da177e4SLinus Torvalds 1238d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 123936a91358SVenkatesh Pallipadi return 0; 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds if (!first_run) { 12421da177e4SLinus Torvalds dmi_check_system(processor_power_dmi_table); 1243c1c30634SAlexey Starikovskiy max_cstate = acpi_processor_cstate_check(max_cstate); 12441da177e4SLinus Torvalds if (max_cstate < ACPI_C_STATES_MAX) 12454be44fcdSLen Brown printk(KERN_NOTICE 12464be44fcdSLen Brown "ACPI: processor limited to max C-state %d\n", 12474be44fcdSLen Brown max_cstate); 12481da177e4SLinus Torvalds first_run++; 12491da177e4SLinus Torvalds } 12501da177e4SLinus Torvalds 125102df8b93SVenkatesh Pallipadi if (!pr) 1252d550d98dSPatrick Mochel return -EINVAL; 125302df8b93SVenkatesh Pallipadi 1254cee324b1SAlexey Starikovskiy if (acpi_gbl_FADT.cst_control && !nocst) { 12554be44fcdSLen Brown status = 1256cee324b1SAlexey Starikovskiy acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); 12571da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 1258a6fc6720SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, 1259a6fc6720SThomas Renninger "Notifying BIOS of _CST ability failed")); 12601da177e4SLinus Torvalds } 12611da177e4SLinus Torvalds } 12621da177e4SLinus Torvalds 12631da177e4SLinus Torvalds acpi_processor_get_power_info(pr); 12644f86d3a8SLen Brown pr->flags.power_setup_done = 1; 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds /* 12671da177e4SLinus Torvalds * Install the idle handler if processor power management is supported. 12681da177e4SLinus Torvalds * Note that we use previously set idle handler will be used on 12691da177e4SLinus Torvalds * platforms that only support C1. 12701da177e4SLinus Torvalds */ 127136a91358SVenkatesh Pallipadi if (pr->flags.power) { 127246bcfad7SDeepthi Dharwar /* Register acpi_idle_driver if not already registered */ 127346bcfad7SDeepthi Dharwar if (!acpi_processor_registered) { 127446bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 127546bcfad7SDeepthi Dharwar retval = cpuidle_register_driver(&acpi_idle_driver); 127646bcfad7SDeepthi Dharwar if (retval) 127746bcfad7SDeepthi Dharwar return retval; 127846bcfad7SDeepthi Dharwar printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", 127946bcfad7SDeepthi Dharwar acpi_idle_driver.name); 128046bcfad7SDeepthi Dharwar } 128146bcfad7SDeepthi Dharwar /* Register per-cpu cpuidle_device. Cpuidle driver 128246bcfad7SDeepthi Dharwar * must already be registered before registering device 128346bcfad7SDeepthi Dharwar */ 128446bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_cx(pr); 128546bcfad7SDeepthi Dharwar retval = cpuidle_register_device(&pr->power.dev); 128646bcfad7SDeepthi Dharwar if (retval) { 128746bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 128846bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 128946bcfad7SDeepthi Dharwar return retval; 129046bcfad7SDeepthi Dharwar } 129146bcfad7SDeepthi Dharwar acpi_processor_registered++; 12921da177e4SLinus Torvalds } 1293d550d98dSPatrick Mochel return 0; 12941da177e4SLinus Torvalds } 12951da177e4SLinus Torvalds 12964be44fcdSLen Brown int acpi_processor_power_exit(struct acpi_processor *pr, 12974be44fcdSLen Brown struct acpi_device *device) 12981da177e4SLinus Torvalds { 1299d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 130036a91358SVenkatesh Pallipadi return 0; 130136a91358SVenkatesh Pallipadi 130246bcfad7SDeepthi Dharwar if (pr->flags.power) { 13034f86d3a8SLen Brown cpuidle_unregister_device(&pr->power.dev); 130446bcfad7SDeepthi Dharwar acpi_processor_registered--; 130546bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 130646bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 130746bcfad7SDeepthi Dharwar } 13081da177e4SLinus Torvalds 130946bcfad7SDeepthi Dharwar pr->flags.power_setup_done = 0; 1310d550d98dSPatrick Mochel return 0; 13111da177e4SLinus Torvalds } 1312