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/module.h> 321da177e4SLinus Torvalds #include <linux/acpi.h> 331da177e4SLinus Torvalds #include <linux/dmi.h> 344e57b681STim Schmielau #include <linux/sched.h> /* need_resched() */ 35e9e2cdb4SThomas Gleixner #include <linux/clockchips.h> 364f86d3a8SLen Brown #include <linux/cpuidle.h> 370a3b15acSRafael J. Wysocki #include <linux/syscore_ops.h> 388b48463fSLv Zheng #include <acpi/processor.h> 391da177e4SLinus Torvalds 403434933bSThomas Gleixner /* 413434933bSThomas Gleixner * Include the apic definitions for x86 to have the APIC timer related defines 423434933bSThomas Gleixner * available also for UP (on SMP it gets magically included via linux/smp.h). 433434933bSThomas Gleixner * asm/acpi.h is not an option, as it would require more include magic. Also 443434933bSThomas Gleixner * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. 453434933bSThomas Gleixner */ 463434933bSThomas Gleixner #ifdef CONFIG_X86 473434933bSThomas Gleixner #include <asm/apic.h> 483434933bSThomas Gleixner #endif 493434933bSThomas Gleixner 50a192a958SLen Brown #define PREFIX "ACPI: " 51a192a958SLen Brown 521da177e4SLinus Torvalds #define ACPI_PROCESSOR_CLASS "processor" 531da177e4SLinus Torvalds #define _COMPONENT ACPI_PROCESSOR_COMPONENT 54f52fd66dSLen Brown ACPI_MODULE_NAME("processor_idle"); 551da177e4SLinus Torvalds 564f86d3a8SLen Brown static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; 574f86d3a8SLen Brown module_param(max_cstate, uint, 0000); 58b6835052SAndreas Mohr static unsigned int nocst __read_mostly; 591da177e4SLinus Torvalds module_param(nocst, uint, 0000); 60d3e7e99fSLen Brown static int bm_check_disable __read_mostly; 61d3e7e99fSLen Brown module_param(bm_check_disable, uint, 0000); 621da177e4SLinus Torvalds 6325de5718SLen Brown static unsigned int latency_factor __read_mostly = 2; 644963f620SLen Brown module_param(latency_factor, uint, 0644); 651da177e4SLinus Torvalds 663d339dcbSDaniel Lezcano static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device); 673d339dcbSDaniel Lezcano 686240a10dSAlex Shi static DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], 696240a10dSAlex Shi acpi_cstate); 70ac3ebafaSDaniel Lezcano 71d1896049SThomas Renninger static int disabled_by_idle_boot_param(void) 72d1896049SThomas Renninger { 73d1896049SThomas Renninger return boot_option_idle_override == IDLE_POLL || 74d1896049SThomas Renninger boot_option_idle_override == IDLE_HALT; 75d1896049SThomas Renninger } 76d1896049SThomas Renninger 771da177e4SLinus Torvalds /* 781da177e4SLinus Torvalds * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. 791da177e4SLinus Torvalds * For now disable this. Probably a bug somewhere else. 801da177e4SLinus Torvalds * 811da177e4SLinus Torvalds * To skip this limit, boot/load with a large max_cstate limit. 821da177e4SLinus Torvalds */ 831855256cSJeff Garzik static int set_max_cstate(const struct dmi_system_id *id) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds if (max_cstate > ACPI_PROCESSOR_MAX_POWER) 861da177e4SLinus Torvalds return 0; 871da177e4SLinus Torvalds 883d35600aSLen Brown printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." 891da177e4SLinus Torvalds " Override with \"processor.max_cstate=%d\"\n", id->ident, 903d35600aSLen Brown (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); 911da177e4SLinus Torvalds 923d35600aSLen Brown max_cstate = (long)id->driver_data; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds return 0; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 97fe7bf106SPaul Gortmaker static struct dmi_system_id processor_power_dmi_table[] = { 98335f16beSDavid Shaohua Li { set_max_cstate, "Clevo 5600D", { 99876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), 100876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, 101335f16beSDavid Shaohua Li (void *)2}, 102370d5cd8SArjan van de Ven { set_max_cstate, "Pavilion zv5000", { 103370d5cd8SArjan van de Ven DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 104370d5cd8SArjan van de Ven DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, 105370d5cd8SArjan van de Ven (void *)1}, 106370d5cd8SArjan van de Ven { set_max_cstate, "Asus L8400B", { 107370d5cd8SArjan van de Ven DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 108370d5cd8SArjan van de Ven DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, 109370d5cd8SArjan van de Ven (void *)1}, 1101da177e4SLinus Torvalds {}, 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 1134f86d3a8SLen Brown 1142e906655Svenkatesh.pallipadi@intel.com /* 1152e906655Svenkatesh.pallipadi@intel.com * Callers should disable interrupts before the call and enable 1162e906655Svenkatesh.pallipadi@intel.com * interrupts after return. 1172e906655Svenkatesh.pallipadi@intel.com */ 118ddc081a1SVenkatesh Pallipadi static void acpi_safe_halt(void) 119ddc081a1SVenkatesh Pallipadi { 120ea811747SPeter Zijlstra if (!tif_need_resched()) { 121ddc081a1SVenkatesh Pallipadi safe_halt(); 12271e93d15SVenki Pallipadi local_irq_disable(); 12371e93d15SVenki Pallipadi } 124ddc081a1SVenkatesh Pallipadi } 125ddc081a1SVenkatesh Pallipadi 126169a0abbSThomas Gleixner #ifdef ARCH_APICTIMER_STOPS_ON_C3 127169a0abbSThomas Gleixner 128169a0abbSThomas Gleixner /* 129169a0abbSThomas Gleixner * Some BIOS implementations switch to C3 in the published C2 state. 130296d93cdSLinus Torvalds * This seems to be a common problem on AMD boxen, but other vendors 131296d93cdSLinus Torvalds * are affected too. We pick the most conservative approach: we assume 132296d93cdSLinus Torvalds * that the local APIC stops in both C2 and C3. 133169a0abbSThomas Gleixner */ 1347e275cc4SLen Brown static void lapic_timer_check_state(int state, struct acpi_processor *pr, 135169a0abbSThomas Gleixner struct acpi_processor_cx *cx) 136169a0abbSThomas Gleixner { 137169a0abbSThomas Gleixner struct acpi_processor_power *pwr = &pr->power; 138e585bef8SThomas Gleixner u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; 139169a0abbSThomas Gleixner 140db954b58SVenkatesh Pallipadi if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) 141db954b58SVenkatesh Pallipadi return; 142db954b58SVenkatesh Pallipadi 14302c68a02SLen Brown if (amd_e400_c1e_detected) 14487ad57baSShaohua Li type = ACPI_STATE_C1; 14587ad57baSShaohua Li 146169a0abbSThomas Gleixner /* 147169a0abbSThomas Gleixner * Check, if one of the previous states already marked the lapic 148169a0abbSThomas Gleixner * unstable 149169a0abbSThomas Gleixner */ 150169a0abbSThomas Gleixner if (pwr->timer_broadcast_on_state < state) 151169a0abbSThomas Gleixner return; 152169a0abbSThomas Gleixner 153e585bef8SThomas Gleixner if (cx->type >= type) 154169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = state; 155169a0abbSThomas Gleixner } 156169a0abbSThomas Gleixner 157918aae42SHidetoshi Seto static void __lapic_timer_propagate_broadcast(void *arg) 158169a0abbSThomas Gleixner { 159f833bab8SSuresh Siddha struct acpi_processor *pr = (struct acpi_processor *) arg; 160e9e2cdb4SThomas Gleixner unsigned long reason; 161e9e2cdb4SThomas Gleixner 162e9e2cdb4SThomas Gleixner reason = pr->power.timer_broadcast_on_state < INT_MAX ? 163e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; 164e9e2cdb4SThomas Gleixner 165e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 166e9e2cdb4SThomas Gleixner } 167e9e2cdb4SThomas Gleixner 168918aae42SHidetoshi Seto static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) 169918aae42SHidetoshi Seto { 170918aae42SHidetoshi Seto smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, 171918aae42SHidetoshi Seto (void *)pr, 1); 172918aae42SHidetoshi Seto } 173918aae42SHidetoshi Seto 174e9e2cdb4SThomas Gleixner /* Power(C) State timer broadcast control */ 1757e275cc4SLen Brown static void lapic_timer_state_broadcast(struct acpi_processor *pr, 176e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 177e9e2cdb4SThomas Gleixner int broadcast) 178e9e2cdb4SThomas Gleixner { 179e9e2cdb4SThomas Gleixner int state = cx - pr->power.states; 180e9e2cdb4SThomas Gleixner 181e9e2cdb4SThomas Gleixner if (state >= pr->power.timer_broadcast_on_state) { 182e9e2cdb4SThomas Gleixner unsigned long reason; 183e9e2cdb4SThomas Gleixner 184e9e2cdb4SThomas Gleixner reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : 185e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_EXIT; 186e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 187e9e2cdb4SThomas Gleixner } 188169a0abbSThomas Gleixner } 189169a0abbSThomas Gleixner 190169a0abbSThomas Gleixner #else 191169a0abbSThomas Gleixner 1927e275cc4SLen Brown static void lapic_timer_check_state(int state, struct acpi_processor *pr, 193169a0abbSThomas Gleixner struct acpi_processor_cx *cstate) { } 1947e275cc4SLen Brown static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } 1957e275cc4SLen Brown static void lapic_timer_state_broadcast(struct acpi_processor *pr, 196e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 197e9e2cdb4SThomas Gleixner int broadcast) 198e9e2cdb4SThomas Gleixner { 199e9e2cdb4SThomas Gleixner } 200169a0abbSThomas Gleixner 201169a0abbSThomas Gleixner #endif 202169a0abbSThomas Gleixner 2030a3b15acSRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 204815ab0fdSLen Brown static u32 saved_bm_rld; 205815ab0fdSLen Brown 20695d45d4cSFengguang Wu static int acpi_processor_suspend(void) 207815ab0fdSLen Brown { 208815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 2090a3b15acSRafael J. Wysocki return 0; 210815ab0fdSLen Brown } 2110a3b15acSRafael J. Wysocki 21295d45d4cSFengguang Wu static void acpi_processor_resume(void) 213815ab0fdSLen Brown { 21443575faaSAl Stone u32 resumed_bm_rld = 0; 215815ab0fdSLen Brown 216815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 2170a3b15acSRafael J. Wysocki if (resumed_bm_rld == saved_bm_rld) 2180a3b15acSRafael J. Wysocki return; 219815ab0fdSLen Brown 220815ab0fdSLen Brown acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 221815ab0fdSLen Brown } 222b04e7bdbSThomas Gleixner 2230a3b15acSRafael J. Wysocki static struct syscore_ops acpi_processor_syscore_ops = { 2240a3b15acSRafael J. Wysocki .suspend = acpi_processor_suspend, 2250a3b15acSRafael J. Wysocki .resume = acpi_processor_resume, 2260a3b15acSRafael J. Wysocki }; 2270a3b15acSRafael J. Wysocki 2280a3b15acSRafael J. Wysocki void acpi_processor_syscore_init(void) 229b04e7bdbSThomas Gleixner { 2300a3b15acSRafael J. Wysocki register_syscore_ops(&acpi_processor_syscore_ops); 231b04e7bdbSThomas Gleixner } 232b04e7bdbSThomas Gleixner 2330a3b15acSRafael J. Wysocki void acpi_processor_syscore_exit(void) 234b04e7bdbSThomas Gleixner { 2350a3b15acSRafael J. Wysocki unregister_syscore_ops(&acpi_processor_syscore_ops); 236b04e7bdbSThomas Gleixner } 2370a3b15acSRafael J. Wysocki #endif /* CONFIG_PM_SLEEP */ 238b04e7bdbSThomas Gleixner 239592913ecSJohn Stultz #if defined(CONFIG_X86) 240520daf72SLen Brown static void tsc_check_state(int state) 241ddb25f9aSAndi Kleen { 242ddb25f9aSAndi Kleen switch (boot_cpu_data.x86_vendor) { 243ddb25f9aSAndi Kleen case X86_VENDOR_AMD: 24440fb1715SVenki Pallipadi case X86_VENDOR_INTEL: 245ddb25f9aSAndi Kleen /* 246ddb25f9aSAndi Kleen * AMD Fam10h TSC will tick in all 247ddb25f9aSAndi Kleen * C/P/S0/S1 states when this bit is set. 248ddb25f9aSAndi Kleen */ 24940fb1715SVenki Pallipadi if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) 250520daf72SLen Brown return; 25140fb1715SVenki Pallipadi 252ddb25f9aSAndi Kleen /*FALL THROUGH*/ 253ddb25f9aSAndi Kleen default: 254520daf72SLen Brown /* TSC could halt in idle, so notify users */ 255520daf72SLen Brown if (state > ACPI_STATE_C1) 256520daf72SLen Brown mark_tsc_unstable("TSC halts in idle"); 257ddb25f9aSAndi Kleen } 258ddb25f9aSAndi Kleen } 259520daf72SLen Brown #else 260520daf72SLen Brown static void tsc_check_state(int state) { return; } 261ddb25f9aSAndi Kleen #endif 262ddb25f9aSAndi Kleen 2631da177e4SLinus Torvalds static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds if (!pr->pblk) 267d550d98dSPatrick Mochel return -ENODEV; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds /* if info is obtained from pblk/fadt, type equals state */ 2701da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; 2711da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; 2721da177e4SLinus Torvalds 2734c033552SVenkatesh Pallipadi #ifndef CONFIG_HOTPLUG_CPU 2744c033552SVenkatesh Pallipadi /* 2754c033552SVenkatesh Pallipadi * Check for P_LVL2_UP flag before entering C2 and above on 2764c033552SVenkatesh Pallipadi * an SMP system. 2774c033552SVenkatesh Pallipadi */ 278ad71860aSAlexey Starikovskiy if ((num_online_cpus() > 1) && 279cee324b1SAlexey Starikovskiy !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 280d550d98dSPatrick Mochel return -ENODEV; 2814c033552SVenkatesh Pallipadi #endif 2824c033552SVenkatesh Pallipadi 2831da177e4SLinus Torvalds /* determine C2 and C3 address from pblk */ 2841da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; 2851da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /* determine latencies from FADT */ 288ba494beeSBob Moore pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency; 289ba494beeSBob Moore pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency; 2901da177e4SLinus Torvalds 2915d76b6f6SLen Brown /* 2925d76b6f6SLen Brown * FADT specified C2 latency must be less than or equal to 2935d76b6f6SLen Brown * 100 microseconds. 2945d76b6f6SLen Brown */ 295ba494beeSBob Moore if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { 2965d76b6f6SLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, 297ba494beeSBob Moore "C2 latency too large [%d]\n", acpi_gbl_FADT.c2_latency)); 2985d76b6f6SLen Brown /* invalidate C2 */ 2995d76b6f6SLen Brown pr->power.states[ACPI_STATE_C2].address = 0; 3005d76b6f6SLen Brown } 3015d76b6f6SLen Brown 302a6d72c18SLen Brown /* 303a6d72c18SLen Brown * FADT supplied C3 latency must be less than or equal to 304a6d72c18SLen Brown * 1000 microseconds. 305a6d72c18SLen Brown */ 306ba494beeSBob Moore if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { 307a6d72c18SLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, 308ba494beeSBob Moore "C3 latency too large [%d]\n", acpi_gbl_FADT.c3_latency)); 309a6d72c18SLen Brown /* invalidate C3 */ 310a6d72c18SLen Brown pr->power.states[ACPI_STATE_C3].address = 0; 311a6d72c18SLen Brown } 312a6d72c18SLen Brown 3131da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 3141da177e4SLinus Torvalds "lvl2[0x%08x] lvl3[0x%08x]\n", 3151da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address, 3161da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address)); 3171da177e4SLinus Torvalds 318d550d98dSPatrick Mochel return 0; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 321991528d7SVenkatesh Pallipadi static int acpi_processor_get_power_info_default(struct acpi_processor *pr) 322acf05f4bSVenkatesh Pallipadi { 323991528d7SVenkatesh Pallipadi if (!pr->power.states[ACPI_STATE_C1].valid) { 324cf824788SJanosch Machowinski /* set the first C-State to C1 */ 325991528d7SVenkatesh Pallipadi /* all processors need to support C1 */ 326acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; 327acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].valid = 1; 3280fda6b40SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; 329991528d7SVenkatesh Pallipadi } 330991528d7SVenkatesh Pallipadi /* the C0 state only exists as a filler in our array */ 331991528d7SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C0].valid = 1; 332d550d98dSPatrick Mochel return 0; 333acf05f4bSVenkatesh Pallipadi } 334acf05f4bSVenkatesh Pallipadi 3351da177e4SLinus Torvalds static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) 3361da177e4SLinus Torvalds { 3371da177e4SLinus Torvalds acpi_status status = 0; 338439913ffSLin Ming u64 count; 339cf824788SJanosch Machowinski int current_count; 3401da177e4SLinus Torvalds int i; 3411da177e4SLinus Torvalds struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 3421da177e4SLinus Torvalds union acpi_object *cst; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds if (nocst) 346d550d98dSPatrick Mochel return -ENODEV; 3471da177e4SLinus Torvalds 348991528d7SVenkatesh Pallipadi current_count = 0; 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); 3511da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 3521da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); 353d550d98dSPatrick Mochel return -ENODEV; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 35650dd0969SJan Engelhardt cst = buffer.pointer; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* There must be at least 2 elements */ 3591da177e4SLinus Torvalds if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { 3606468463aSLen Brown printk(KERN_ERR PREFIX "not enough elements in _CST\n"); 3611da177e4SLinus Torvalds status = -EFAULT; 3621da177e4SLinus Torvalds goto end; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds count = cst->package.elements[0].integer.value; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds /* Validate number of power states. */ 3681da177e4SLinus Torvalds if (count < 1 || count != cst->package.count - 1) { 3696468463aSLen Brown printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); 3701da177e4SLinus Torvalds status = -EFAULT; 3711da177e4SLinus Torvalds goto end; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* Tell driver that at least _CST is supported. */ 3751da177e4SLinus Torvalds pr->flags.has_cst = 1; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds for (i = 1; i <= count; i++) { 3781da177e4SLinus Torvalds union acpi_object *element; 3791da177e4SLinus Torvalds union acpi_object *obj; 3801da177e4SLinus Torvalds struct acpi_power_register *reg; 3811da177e4SLinus Torvalds struct acpi_processor_cx cx; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds memset(&cx, 0, sizeof(cx)); 3841da177e4SLinus Torvalds 38550dd0969SJan Engelhardt element = &(cst->package.elements[i]); 3861da177e4SLinus Torvalds if (element->type != ACPI_TYPE_PACKAGE) 3871da177e4SLinus Torvalds continue; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds if (element->package.count != 4) 3901da177e4SLinus Torvalds continue; 3911da177e4SLinus Torvalds 39250dd0969SJan Engelhardt obj = &(element->package.elements[0]); 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_BUFFER) 3951da177e4SLinus Torvalds continue; 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds reg = (struct acpi_power_register *)obj->buffer.pointer; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && 4001da177e4SLinus Torvalds (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) 4011da177e4SLinus Torvalds continue; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* There should be an easy way to extract an integer... */ 40450dd0969SJan Engelhardt obj = &(element->package.elements[1]); 4051da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4061da177e4SLinus Torvalds continue; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds cx.type = obj->integer.value; 409991528d7SVenkatesh Pallipadi /* 410991528d7SVenkatesh Pallipadi * Some buggy BIOSes won't list C1 in _CST - 411991528d7SVenkatesh Pallipadi * Let acpi_processor_get_power_info_default() handle them later 412991528d7SVenkatesh Pallipadi */ 413991528d7SVenkatesh Pallipadi if (i == 1 && cx.type != ACPI_STATE_C1) 414991528d7SVenkatesh Pallipadi current_count++; 4151da177e4SLinus Torvalds 416991528d7SVenkatesh Pallipadi cx.address = reg->address; 417991528d7SVenkatesh Pallipadi cx.index = current_count + 1; 4181da177e4SLinus Torvalds 419bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_SYSTEMIO; 420991528d7SVenkatesh Pallipadi if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 421991528d7SVenkatesh Pallipadi if (acpi_processor_ffh_cstate_probe 422991528d7SVenkatesh Pallipadi (pr->id, &cx, reg) == 0) { 423bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_FFH; 424bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx.type == ACPI_STATE_C1) { 425991528d7SVenkatesh Pallipadi /* 426991528d7SVenkatesh Pallipadi * C1 is a special case where FIXED_HARDWARE 427991528d7SVenkatesh Pallipadi * can be handled in non-MWAIT way as well. 428991528d7SVenkatesh Pallipadi * In that case, save this _CST entry info. 429991528d7SVenkatesh Pallipadi * Otherwise, ignore this info and continue. 430991528d7SVenkatesh Pallipadi */ 431bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_HALT; 4324fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 433bc71bec9Svenkatesh.pallipadi@intel.com } else { 4341da177e4SLinus Torvalds continue; 435991528d7SVenkatesh Pallipadi } 436da5e09a1SZhao Yakui if (cx.type == ACPI_STATE_C1 && 437d1896049SThomas Renninger (boot_option_idle_override == IDLE_NOMWAIT)) { 438c1e3b377SZhao Yakui /* 439c1e3b377SZhao Yakui * In most cases the C1 space_id obtained from 440c1e3b377SZhao Yakui * _CST object is FIXED_HARDWARE access mode. 441c1e3b377SZhao Yakui * But when the option of idle=halt is added, 442c1e3b377SZhao Yakui * the entry_method type should be changed from 443c1e3b377SZhao Yakui * CSTATE_FFH to CSTATE_HALT. 444da5e09a1SZhao Yakui * When the option of idle=nomwait is added, 445da5e09a1SZhao Yakui * the C1 entry_method type should be 446da5e09a1SZhao Yakui * CSTATE_HALT. 447c1e3b377SZhao Yakui */ 448c1e3b377SZhao Yakui cx.entry_method = ACPI_CSTATE_HALT; 449c1e3b377SZhao Yakui snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 450c1e3b377SZhao Yakui } 4514fcb2fcdSVenkatesh Pallipadi } else { 4524fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 4534fcb2fcdSVenkatesh Pallipadi cx.address); 454991528d7SVenkatesh Pallipadi } 4551da177e4SLinus Torvalds 4560fda6b40SVenkatesh Pallipadi if (cx.type == ACPI_STATE_C1) { 4570fda6b40SVenkatesh Pallipadi cx.valid = 1; 4580fda6b40SVenkatesh Pallipadi } 4594fcb2fcdSVenkatesh Pallipadi 46050dd0969SJan Engelhardt obj = &(element->package.elements[2]); 4611da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4621da177e4SLinus Torvalds continue; 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds cx.latency = obj->integer.value; 4651da177e4SLinus Torvalds 46650dd0969SJan Engelhardt obj = &(element->package.elements[3]); 4671da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4681da177e4SLinus Torvalds continue; 4691da177e4SLinus Torvalds 470cf824788SJanosch Machowinski current_count++; 471cf824788SJanosch Machowinski memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); 472cf824788SJanosch Machowinski 473cf824788SJanosch Machowinski /* 474cf824788SJanosch Machowinski * We support total ACPI_PROCESSOR_MAX_POWER - 1 475cf824788SJanosch Machowinski * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) 476cf824788SJanosch Machowinski */ 477cf824788SJanosch Machowinski if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { 478cf824788SJanosch Machowinski printk(KERN_WARNING 479cf824788SJanosch Machowinski "Limiting number of power states to max (%d)\n", 480cf824788SJanosch Machowinski ACPI_PROCESSOR_MAX_POWER); 481cf824788SJanosch Machowinski printk(KERN_WARNING 482cf824788SJanosch Machowinski "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); 483cf824788SJanosch Machowinski break; 484cf824788SJanosch Machowinski } 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4874be44fcdSLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", 488cf824788SJanosch Machowinski current_count)); 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* Validate number of power states discovered */ 491cf824788SJanosch Machowinski if (current_count < 2) 4926d93c648SVenkatesh Pallipadi status = -EFAULT; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds end: 49502438d87SLen Brown kfree(buffer.pointer); 4961da177e4SLinus Torvalds 497d550d98dSPatrick Mochel return status; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5004be44fcdSLen Brown static void acpi_processor_power_verify_c3(struct acpi_processor *pr, 5011da177e4SLinus Torvalds struct acpi_processor_cx *cx) 5021da177e4SLinus Torvalds { 503ee1ca48fSPallipadi, Venkatesh static int bm_check_flag = -1; 504ee1ca48fSPallipadi, Venkatesh static int bm_control_flag = -1; 50502df8b93SVenkatesh Pallipadi 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds if (!cx->address) 508d550d98dSPatrick Mochel return; 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds /* 5111da177e4SLinus Torvalds * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) 5121da177e4SLinus Torvalds * DMA transfers are used by any ISA device to avoid livelock. 5131da177e4SLinus Torvalds * Note that we could disable Type-F DMA (as recommended by 5141da177e4SLinus Torvalds * the erratum), but this is known to disrupt certain ISA 5151da177e4SLinus Torvalds * devices thus we take the conservative approach. 5161da177e4SLinus Torvalds */ 5171da177e4SLinus Torvalds else if (errata.piix4.fdma) { 5181da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 5191da177e4SLinus Torvalds "C3 not supported on PIIX4 with Type-F DMA\n")); 520d550d98dSPatrick Mochel return; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 52302df8b93SVenkatesh Pallipadi /* All the logic here assumes flags.bm_check is same across all CPUs */ 524ee1ca48fSPallipadi, Venkatesh if (bm_check_flag == -1) { 52502df8b93SVenkatesh Pallipadi /* Determine whether bm_check is needed based on CPU */ 52602df8b93SVenkatesh Pallipadi acpi_processor_power_init_bm_check(&(pr->flags), pr->id); 52702df8b93SVenkatesh Pallipadi bm_check_flag = pr->flags.bm_check; 528ee1ca48fSPallipadi, Venkatesh bm_control_flag = pr->flags.bm_control; 52902df8b93SVenkatesh Pallipadi } else { 53002df8b93SVenkatesh Pallipadi pr->flags.bm_check = bm_check_flag; 531ee1ca48fSPallipadi, Venkatesh pr->flags.bm_control = bm_control_flag; 53202df8b93SVenkatesh Pallipadi } 53302df8b93SVenkatesh Pallipadi 53402df8b93SVenkatesh Pallipadi if (pr->flags.bm_check) { 53502df8b93SVenkatesh Pallipadi if (!pr->flags.bm_control) { 536ed3110efSVenki Pallipadi if (pr->flags.has_cst != 1) { 537ed3110efSVenki Pallipadi /* bus mastering control is necessary */ 53802df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 539ed3110efSVenki Pallipadi "C3 support requires BM control\n")); 540ed3110efSVenki Pallipadi return; 541ed3110efSVenki Pallipadi } else { 542ed3110efSVenki Pallipadi /* Here we enter C3 without bus mastering */ 543ed3110efSVenki Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 544ed3110efSVenki Pallipadi "C3 support without BM control\n")); 545ed3110efSVenki Pallipadi } 54602df8b93SVenkatesh Pallipadi } 54702df8b93SVenkatesh Pallipadi } else { 54802df8b93SVenkatesh Pallipadi /* 54902df8b93SVenkatesh Pallipadi * WBINVD should be set in fadt, for C3 state to be 55002df8b93SVenkatesh Pallipadi * supported on when bm_check is not required. 55102df8b93SVenkatesh Pallipadi */ 552cee324b1SAlexey Starikovskiy if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { 55302df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 55402df8b93SVenkatesh Pallipadi "Cache invalidation should work properly" 55502df8b93SVenkatesh Pallipadi " for C3 to be enabled on SMP systems\n")); 556d550d98dSPatrick Mochel return; 55702df8b93SVenkatesh Pallipadi } 55802df8b93SVenkatesh Pallipadi } 55902df8b93SVenkatesh Pallipadi 5601da177e4SLinus Torvalds /* 5611da177e4SLinus Torvalds * Otherwise we've met all of our C3 requirements. 5621da177e4SLinus Torvalds * Normalize the C3 latency to expidite policy. Enable 5631da177e4SLinus Torvalds * checking of bus mastering status (bm_check) so we can 5641da177e4SLinus Torvalds * use this in our C3 policy 5651da177e4SLinus Torvalds */ 5661da177e4SLinus Torvalds cx->valid = 1; 5674f86d3a8SLen Brown 56831878dd8SLen Brown /* 56931878dd8SLen Brown * On older chipsets, BM_RLD needs to be set 57031878dd8SLen Brown * in order for Bus Master activity to wake the 57131878dd8SLen Brown * system from C3. Newer chipsets handle DMA 57231878dd8SLen Brown * during C3 automatically and BM_RLD is a NOP. 57331878dd8SLen Brown * In either case, the proper way to 57431878dd8SLen Brown * handle BM_RLD is to set it and leave it set. 57531878dd8SLen Brown */ 57650ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); 5771da177e4SLinus Torvalds 578d550d98dSPatrick Mochel return; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds static int acpi_processor_power_verify(struct acpi_processor *pr) 5821da177e4SLinus Torvalds { 5831da177e4SLinus Torvalds unsigned int i; 5841da177e4SLinus Torvalds unsigned int working = 0; 5856eb0a0fdSVenkatesh Pallipadi 586169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = INT_MAX; 5876eb0a0fdSVenkatesh Pallipadi 588a0bf284bSLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 5891da177e4SLinus Torvalds struct acpi_processor_cx *cx = &pr->power.states[i]; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds switch (cx->type) { 5921da177e4SLinus Torvalds case ACPI_STATE_C1: 5931da177e4SLinus Torvalds cx->valid = 1; 5941da177e4SLinus Torvalds break; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds case ACPI_STATE_C2: 597d22edd29SLen Brown if (!cx->address) 598d22edd29SLen Brown break; 599d22edd29SLen Brown cx->valid = 1; 6001da177e4SLinus Torvalds break; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds case ACPI_STATE_C3: 6031da177e4SLinus Torvalds acpi_processor_power_verify_c3(pr, cx); 6041da177e4SLinus Torvalds break; 6051da177e4SLinus Torvalds } 6067e275cc4SLen Brown if (!cx->valid) 6077e275cc4SLen Brown continue; 6081da177e4SLinus Torvalds 6097e275cc4SLen Brown lapic_timer_check_state(i, pr, cx); 6107e275cc4SLen Brown tsc_check_state(cx->type); 6111da177e4SLinus Torvalds working++; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 614918aae42SHidetoshi Seto lapic_timer_propagate_broadcast(pr); 615bd663347SAndi Kleen 6161da177e4SLinus Torvalds return (working); 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds 6194be44fcdSLen Brown static int acpi_processor_get_power_info(struct acpi_processor *pr) 6201da177e4SLinus Torvalds { 6211da177e4SLinus Torvalds unsigned int i; 6221da177e4SLinus Torvalds int result; 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds /* NOTE: the idle thread may not be running while calling 6261da177e4SLinus Torvalds * this function */ 6271da177e4SLinus Torvalds 628991528d7SVenkatesh Pallipadi /* Zero initialize all the C-states info. */ 629991528d7SVenkatesh Pallipadi memset(pr->power.states, 0, sizeof(pr->power.states)); 630991528d7SVenkatesh Pallipadi 6311da177e4SLinus Torvalds result = acpi_processor_get_power_info_cst(pr); 6326d93c648SVenkatesh Pallipadi if (result == -ENODEV) 633c5a114f1SDarrick J. Wong result = acpi_processor_get_power_info_fadt(pr); 6346d93c648SVenkatesh Pallipadi 635991528d7SVenkatesh Pallipadi if (result) 636991528d7SVenkatesh Pallipadi return result; 637991528d7SVenkatesh Pallipadi 638991528d7SVenkatesh Pallipadi acpi_processor_get_power_info_default(pr); 639991528d7SVenkatesh Pallipadi 640cf824788SJanosch Machowinski pr->power.count = acpi_processor_power_verify(pr); 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds /* 6431da177e4SLinus Torvalds * if one state of type C2 or C3 is available, mark this 6441da177e4SLinus Torvalds * CPU as being "idle manageable" 6451da177e4SLinus Torvalds */ 6461da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 647acf05f4bSVenkatesh Pallipadi if (pr->power.states[i].valid) { 6481da177e4SLinus Torvalds pr->power.count = i; 6492203d6edSLinus Torvalds if (pr->power.states[i].type >= ACPI_STATE_C2) 6501da177e4SLinus Torvalds pr->flags.power = 1; 6511da177e4SLinus Torvalds } 652acf05f4bSVenkatesh Pallipadi } 6531da177e4SLinus Torvalds 654d550d98dSPatrick Mochel return 0; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6574f86d3a8SLen Brown /** 6584f86d3a8SLen Brown * acpi_idle_bm_check - checks if bus master activity was detected 6594f86d3a8SLen Brown */ 6604f86d3a8SLen Brown static int acpi_idle_bm_check(void) 6614f86d3a8SLen Brown { 6624f86d3a8SLen Brown u32 bm_status = 0; 6634f86d3a8SLen Brown 664d3e7e99fSLen Brown if (bm_check_disable) 665d3e7e99fSLen Brown return 0; 666d3e7e99fSLen Brown 66750ffba1bSBob Moore acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); 6684f86d3a8SLen Brown if (bm_status) 66950ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); 6704f86d3a8SLen Brown /* 6714f86d3a8SLen Brown * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect 6724f86d3a8SLen Brown * the true state of bus mastering activity; forcing us to 6734f86d3a8SLen Brown * manually check the BMIDEA bit of each IDE channel. 6744f86d3a8SLen Brown */ 6754f86d3a8SLen Brown else if (errata.piix4.bmisx) { 6764f86d3a8SLen Brown if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) 6774f86d3a8SLen Brown || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) 6784f86d3a8SLen Brown bm_status = 1; 6794f86d3a8SLen Brown } 6804f86d3a8SLen Brown return bm_status; 6814f86d3a8SLen Brown } 6824f86d3a8SLen Brown 6834f86d3a8SLen Brown /** 6844f86d3a8SLen Brown * acpi_idle_do_entry - a helper function that does C2 and C3 type entry 6854f86d3a8SLen Brown * @cx: cstate data 686bc71bec9Svenkatesh.pallipadi@intel.com * 687bc71bec9Svenkatesh.pallipadi@intel.com * Caller disables interrupt before call and enables interrupt after return. 6884f86d3a8SLen Brown */ 6894f86d3a8SLen Brown static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) 6904f86d3a8SLen Brown { 691dcf30997SSteven Rostedt /* Don't trace irqs off for idle */ 692dcf30997SSteven Rostedt stop_critical_timings(); 693bc71bec9Svenkatesh.pallipadi@intel.com if (cx->entry_method == ACPI_CSTATE_FFH) { 6944f86d3a8SLen Brown /* Call into architectural FFH based C-state */ 6954f86d3a8SLen Brown acpi_processor_ffh_cstate_enter(cx); 696bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx->entry_method == ACPI_CSTATE_HALT) { 697bc71bec9Svenkatesh.pallipadi@intel.com acpi_safe_halt(); 6984f86d3a8SLen Brown } else { 6994f86d3a8SLen Brown /* IO port based C-state */ 7004f86d3a8SLen Brown inb(cx->address); 7014f86d3a8SLen Brown /* Dummy wait op - must do something useless after P_LVL2 read 7024f86d3a8SLen Brown because chipsets cannot guarantee that STPCLK# signal 7034f86d3a8SLen Brown gets asserted in time to freeze execution properly. */ 704cfa806f0SAndi Kleen inl(acpi_gbl_FADT.xpm_timer_block.address); 7054f86d3a8SLen Brown } 706dcf30997SSteven Rostedt start_critical_timings(); 7074f86d3a8SLen Brown } 7084f86d3a8SLen Brown 7094f86d3a8SLen Brown /** 7104f86d3a8SLen Brown * acpi_idle_enter_c1 - enters an ACPI C1 state-type 7114f86d3a8SLen Brown * @dev: the target CPU 71246bcfad7SDeepthi Dharwar * @drv: cpuidle driver containing cpuidle state info 713e978aa7dSDeepthi Dharwar * @index: index of target state 7144f86d3a8SLen Brown * 7154f86d3a8SLen Brown * This is equivalent to the HALT instruction. 7164f86d3a8SLen Brown */ 7174f86d3a8SLen Brown static int acpi_idle_enter_c1(struct cpuidle_device *dev, 71846bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 7194f86d3a8SLen Brown { 7204f86d3a8SLen Brown struct acpi_processor *pr; 7216240a10dSAlex Shi struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 7229b12e18cSvenkatesh.pallipadi@intel.com 7234a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 7244f86d3a8SLen Brown 7254f86d3a8SLen Brown if (unlikely(!pr)) 726e978aa7dSDeepthi Dharwar return -EINVAL; 7274f86d3a8SLen Brown 728ea811747SPeter Zijlstra if (cx->entry_method == ACPI_CSTATE_FFH) { 729ea811747SPeter Zijlstra if (current_set_polling_and_test()) 730ea811747SPeter Zijlstra return -EINVAL; 731ea811747SPeter Zijlstra } 732ea811747SPeter Zijlstra 7337e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 734bc71bec9Svenkatesh.pallipadi@intel.com acpi_idle_do_entry(cx); 7354f86d3a8SLen Brown 7367e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 7374f86d3a8SLen Brown 738e978aa7dSDeepthi Dharwar return index; 7394f86d3a8SLen Brown } 7404f86d3a8SLen Brown 7411a022e3fSBoris Ostrovsky 7421a022e3fSBoris Ostrovsky /** 7431a022e3fSBoris Ostrovsky * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) 7441a022e3fSBoris Ostrovsky * @dev: the target CPU 7451a022e3fSBoris Ostrovsky * @index: the index of suggested state 7461a022e3fSBoris Ostrovsky */ 7471a022e3fSBoris Ostrovsky static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) 7481a022e3fSBoris Ostrovsky { 7496240a10dSAlex Shi struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 7501a022e3fSBoris Ostrovsky 7511a022e3fSBoris Ostrovsky ACPI_FLUSH_CPU_CACHE(); 7521a022e3fSBoris Ostrovsky 7531a022e3fSBoris Ostrovsky while (1) { 7541a022e3fSBoris Ostrovsky 7551a022e3fSBoris Ostrovsky if (cx->entry_method == ACPI_CSTATE_HALT) 75654f70077SLuck, Tony safe_halt(); 7571a022e3fSBoris Ostrovsky else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { 7581a022e3fSBoris Ostrovsky inb(cx->address); 7591a022e3fSBoris Ostrovsky /* See comment in acpi_idle_do_entry() */ 7601a022e3fSBoris Ostrovsky inl(acpi_gbl_FADT.xpm_timer_block.address); 7611a022e3fSBoris Ostrovsky } else 7621a022e3fSBoris Ostrovsky return -ENODEV; 7631a022e3fSBoris Ostrovsky } 7641a022e3fSBoris Ostrovsky 7651a022e3fSBoris Ostrovsky /* Never reached */ 7661a022e3fSBoris Ostrovsky return 0; 7671a022e3fSBoris Ostrovsky } 7681a022e3fSBoris Ostrovsky 7694f86d3a8SLen Brown /** 7704f86d3a8SLen Brown * acpi_idle_enter_simple - enters an ACPI state without BM handling 7714f86d3a8SLen Brown * @dev: the target CPU 77246bcfad7SDeepthi Dharwar * @drv: cpuidle driver with cpuidle state information 773e978aa7dSDeepthi Dharwar * @index: the index of suggested state 7744f86d3a8SLen Brown */ 7754f86d3a8SLen Brown static int acpi_idle_enter_simple(struct cpuidle_device *dev, 77646bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 7774f86d3a8SLen Brown { 7784f86d3a8SLen Brown struct acpi_processor *pr; 7796240a10dSAlex Shi struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 78050629118SVenkatesh Pallipadi 7814a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 7824f86d3a8SLen Brown 7834f86d3a8SLen Brown if (unlikely(!pr)) 784e978aa7dSDeepthi Dharwar return -EINVAL; 785e196441bSLen Brown 786ea811747SPeter Zijlstra if (cx->entry_method == ACPI_CSTATE_FFH) { 787ea811747SPeter Zijlstra if (current_set_polling_and_test()) 788e978aa7dSDeepthi Dharwar return -EINVAL; 7894f86d3a8SLen Brown } 7904f86d3a8SLen Brown 791e17bcb43SThomas Gleixner /* 792e17bcb43SThomas Gleixner * Must be done before busmaster disable as we might need to 793e17bcb43SThomas Gleixner * access HPET ! 794e17bcb43SThomas Gleixner */ 7957e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 796e17bcb43SThomas Gleixner 7974f86d3a8SLen Brown if (cx->type == ACPI_STATE_C3) 7984f86d3a8SLen Brown ACPI_FLUSH_CPU_CACHE(); 7994f86d3a8SLen Brown 80050629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 80150629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 8024f86d3a8SLen Brown acpi_idle_do_entry(cx); 8034f86d3a8SLen Brown 804a474a515SJulius Werner sched_clock_idle_wakeup_event(0); 805e978aa7dSDeepthi Dharwar 8067e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 807e978aa7dSDeepthi Dharwar return index; 8084f86d3a8SLen Brown } 8094f86d3a8SLen Brown 8104f86d3a8SLen Brown static int c3_cpu_count; 811e12f65f7SThomas Gleixner static DEFINE_RAW_SPINLOCK(c3_lock); 8124f86d3a8SLen Brown 8134f86d3a8SLen Brown /** 8144f86d3a8SLen Brown * acpi_idle_enter_bm - enters C3 with proper BM handling 8154f86d3a8SLen Brown * @dev: the target CPU 81646bcfad7SDeepthi Dharwar * @drv: cpuidle driver containing state data 817e978aa7dSDeepthi Dharwar * @index: the index of suggested state 8184f86d3a8SLen Brown * 8194f86d3a8SLen Brown * If BM is detected, the deepest non-C3 idle state is entered instead. 8204f86d3a8SLen Brown */ 8214f86d3a8SLen Brown static int acpi_idle_enter_bm(struct cpuidle_device *dev, 82246bcfad7SDeepthi Dharwar struct cpuidle_driver *drv, int index) 8234f86d3a8SLen Brown { 8244f86d3a8SLen Brown struct acpi_processor *pr; 8256240a10dSAlex Shi struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 82650629118SVenkatesh Pallipadi 8274a6f4fe8SChristoph Lameter pr = __this_cpu_read(processors); 8284f86d3a8SLen Brown 8294f86d3a8SLen Brown if (unlikely(!pr)) 830e978aa7dSDeepthi Dharwar return -EINVAL; 8314f86d3a8SLen Brown 832718be4aaSLen Brown if (!cx->bm_sts_skip && acpi_idle_bm_check()) { 83346bcfad7SDeepthi Dharwar if (drv->safe_state_index >= 0) { 83446bcfad7SDeepthi Dharwar return drv->states[drv->safe_state_index].enter(dev, 83546bcfad7SDeepthi Dharwar drv, drv->safe_state_index); 836ddc081a1SVenkatesh Pallipadi } else { 837ddc081a1SVenkatesh Pallipadi acpi_safe_halt(); 83875cc5235SDeepthi Dharwar return -EBUSY; 839ddc081a1SVenkatesh Pallipadi } 840ddc081a1SVenkatesh Pallipadi } 841ddc081a1SVenkatesh Pallipadi 842ea811747SPeter Zijlstra if (cx->entry_method == ACPI_CSTATE_FFH) { 843ea811747SPeter Zijlstra if (current_set_polling_and_test()) 844e978aa7dSDeepthi Dharwar return -EINVAL; 8454f86d3a8SLen Brown } 8464f86d3a8SLen Brown 847996520c1SVenki Pallipadi acpi_unlazy_tlb(smp_processor_id()); 848996520c1SVenki Pallipadi 84950629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 85050629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 8514f86d3a8SLen Brown /* 8524f86d3a8SLen Brown * Must be done before busmaster disable as we might need to 8534f86d3a8SLen Brown * access HPET ! 8544f86d3a8SLen Brown */ 8557e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 8564f86d3a8SLen Brown 857c9c860e5SVenkatesh Pallipadi /* 858c9c860e5SVenkatesh Pallipadi * disable bus master 859c9c860e5SVenkatesh Pallipadi * bm_check implies we need ARB_DIS 860c9c860e5SVenkatesh Pallipadi * !bm_check implies we need cache flush 861c9c860e5SVenkatesh Pallipadi * bm_control implies whether we can do ARB_DIS 862c9c860e5SVenkatesh Pallipadi * 863c9c860e5SVenkatesh Pallipadi * That leaves a case where bm_check is set and bm_control is 864c9c860e5SVenkatesh Pallipadi * not set. In that case we cannot do much, we enter C3 865c9c860e5SVenkatesh Pallipadi * without doing anything. 866c9c860e5SVenkatesh Pallipadi */ 867c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 868e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 8694f86d3a8SLen Brown c3_cpu_count++; 8704f86d3a8SLen Brown /* Disable bus master arbitration when all CPUs are in C3 */ 8714f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 87250ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); 873e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 874c9c860e5SVenkatesh Pallipadi } else if (!pr->flags.bm_check) { 875c9c860e5SVenkatesh Pallipadi ACPI_FLUSH_CPU_CACHE(); 876c9c860e5SVenkatesh Pallipadi } 8774f86d3a8SLen Brown 8784f86d3a8SLen Brown acpi_idle_do_entry(cx); 8794f86d3a8SLen Brown 8804f86d3a8SLen Brown /* Re-enable bus master arbitration */ 881c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 882e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 88350ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); 8844f86d3a8SLen Brown c3_cpu_count--; 885e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 8864f86d3a8SLen Brown } 8874f86d3a8SLen Brown 888a474a515SJulius Werner sched_clock_idle_wakeup_event(0); 889e978aa7dSDeepthi Dharwar 8907e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 891e978aa7dSDeepthi Dharwar return index; 8924f86d3a8SLen Brown } 8934f86d3a8SLen Brown 8944f86d3a8SLen Brown struct cpuidle_driver acpi_idle_driver = { 8954f86d3a8SLen Brown .name = "acpi_idle", 8964f86d3a8SLen Brown .owner = THIS_MODULE, 8974f86d3a8SLen Brown }; 8984f86d3a8SLen Brown 8994f86d3a8SLen Brown /** 90046bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE 90146bcfad7SDeepthi Dharwar * device i.e. per-cpu data 90246bcfad7SDeepthi Dharwar * 9034f86d3a8SLen Brown * @pr: the ACPI processor 9046ef0f086SDaniel Lezcano * @dev : the cpuidle device 9054f86d3a8SLen Brown */ 9066ef0f086SDaniel Lezcano static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, 9076ef0f086SDaniel Lezcano struct cpuidle_device *dev) 9084f86d3a8SLen Brown { 9099a0b8415Svenkatesh.pallipadi@intel.com int i, count = CPUIDLE_DRIVER_STATE_START; 9104f86d3a8SLen Brown struct acpi_processor_cx *cx; 9114f86d3a8SLen Brown 9124f86d3a8SLen Brown if (!pr->flags.power_setup_done) 9134f86d3a8SLen Brown return -EINVAL; 9144f86d3a8SLen Brown 9154f86d3a8SLen Brown if (pr->flags.power == 0) { 9164f86d3a8SLen Brown return -EINVAL; 9174f86d3a8SLen Brown } 9184f86d3a8SLen Brown 919b88a634aSKonrad Rzeszutek Wilk if (!dev) 920b88a634aSKonrad Rzeszutek Wilk return -EINVAL; 921b88a634aSKonrad Rzeszutek Wilk 922dcb84f33SVenkatesh Pallipadi dev->cpu = pr->id; 9234fcb2fcdSVenkatesh Pallipadi 924615dfd93SLen Brown if (max_cstate == 0) 925615dfd93SLen Brown max_cstate = 1; 926615dfd93SLen Brown 9274f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 9284f86d3a8SLen Brown cx = &pr->power.states[i]; 9294f86d3a8SLen Brown 9304f86d3a8SLen Brown if (!cx->valid) 9314f86d3a8SLen Brown continue; 9324f86d3a8SLen Brown 9334f86d3a8SLen Brown #ifdef CONFIG_HOTPLUG_CPU 9344f86d3a8SLen Brown if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 9354f86d3a8SLen Brown !pr->flags.has_cst && 9364f86d3a8SLen Brown !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 9374f86d3a8SLen Brown continue; 9384f86d3a8SLen Brown #endif 9396240a10dSAlex Shi per_cpu(acpi_cstate[count], dev->cpu) = cx; 9404f86d3a8SLen Brown 94146bcfad7SDeepthi Dharwar count++; 94246bcfad7SDeepthi Dharwar if (count == CPUIDLE_STATE_MAX) 94346bcfad7SDeepthi Dharwar break; 94446bcfad7SDeepthi Dharwar } 94546bcfad7SDeepthi Dharwar 94646bcfad7SDeepthi Dharwar dev->state_count = count; 94746bcfad7SDeepthi Dharwar 94846bcfad7SDeepthi Dharwar if (!count) 94946bcfad7SDeepthi Dharwar return -EINVAL; 95046bcfad7SDeepthi Dharwar 95146bcfad7SDeepthi Dharwar return 0; 95246bcfad7SDeepthi Dharwar } 95346bcfad7SDeepthi Dharwar 95446bcfad7SDeepthi Dharwar /** 95546bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle states- prepares and configures cpuidle 95646bcfad7SDeepthi Dharwar * global state data i.e. idle routines 95746bcfad7SDeepthi Dharwar * 95846bcfad7SDeepthi Dharwar * @pr: the ACPI processor 95946bcfad7SDeepthi Dharwar */ 96046bcfad7SDeepthi Dharwar static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) 96146bcfad7SDeepthi Dharwar { 96246bcfad7SDeepthi Dharwar int i, count = CPUIDLE_DRIVER_STATE_START; 96346bcfad7SDeepthi Dharwar struct acpi_processor_cx *cx; 96446bcfad7SDeepthi Dharwar struct cpuidle_state *state; 96546bcfad7SDeepthi Dharwar struct cpuidle_driver *drv = &acpi_idle_driver; 96646bcfad7SDeepthi Dharwar 96746bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 96846bcfad7SDeepthi Dharwar return -EINVAL; 96946bcfad7SDeepthi Dharwar 97046bcfad7SDeepthi Dharwar if (pr->flags.power == 0) 97146bcfad7SDeepthi Dharwar return -EINVAL; 97246bcfad7SDeepthi Dharwar 97346bcfad7SDeepthi Dharwar drv->safe_state_index = -1; 97446bcfad7SDeepthi Dharwar for (i = 0; i < CPUIDLE_STATE_MAX; i++) { 97546bcfad7SDeepthi Dharwar drv->states[i].name[0] = '\0'; 97646bcfad7SDeepthi Dharwar drv->states[i].desc[0] = '\0'; 97746bcfad7SDeepthi Dharwar } 97846bcfad7SDeepthi Dharwar 97946bcfad7SDeepthi Dharwar if (max_cstate == 0) 98046bcfad7SDeepthi Dharwar max_cstate = 1; 98146bcfad7SDeepthi Dharwar 98246bcfad7SDeepthi Dharwar for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 98346bcfad7SDeepthi Dharwar cx = &pr->power.states[i]; 98446bcfad7SDeepthi Dharwar 98546bcfad7SDeepthi Dharwar if (!cx->valid) 98646bcfad7SDeepthi Dharwar continue; 98746bcfad7SDeepthi Dharwar 98846bcfad7SDeepthi Dharwar #ifdef CONFIG_HOTPLUG_CPU 98946bcfad7SDeepthi Dharwar if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 99046bcfad7SDeepthi Dharwar !pr->flags.has_cst && 99146bcfad7SDeepthi Dharwar !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 99246bcfad7SDeepthi Dharwar continue; 99346bcfad7SDeepthi Dharwar #endif 99446bcfad7SDeepthi Dharwar 99546bcfad7SDeepthi Dharwar state = &drv->states[count]; 9964f86d3a8SLen Brown snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); 9974fcb2fcdSVenkatesh Pallipadi strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 9984f86d3a8SLen Brown state->exit_latency = cx->latency; 9994963f620SLen Brown state->target_residency = cx->latency * latency_factor; 10004f86d3a8SLen Brown 10014f86d3a8SLen Brown state->flags = 0; 10024f86d3a8SLen Brown switch (cx->type) { 10034f86d3a8SLen Brown case ACPI_STATE_C1: 10048e92b660SVenki Pallipadi if (cx->entry_method == ACPI_CSTATE_FFH) 10059b12e18cSvenkatesh.pallipadi@intel.com state->flags |= CPUIDLE_FLAG_TIME_VALID; 10068e92b660SVenki Pallipadi 10074f86d3a8SLen Brown state->enter = acpi_idle_enter_c1; 10081a022e3fSBoris Ostrovsky state->enter_dead = acpi_idle_play_dead; 100946bcfad7SDeepthi Dharwar drv->safe_state_index = count; 10104f86d3a8SLen Brown break; 10114f86d3a8SLen Brown 10124f86d3a8SLen Brown case ACPI_STATE_C2: 10134f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 10144f86d3a8SLen Brown state->enter = acpi_idle_enter_simple; 10151a022e3fSBoris Ostrovsky state->enter_dead = acpi_idle_play_dead; 101646bcfad7SDeepthi Dharwar drv->safe_state_index = count; 10174f86d3a8SLen Brown break; 10184f86d3a8SLen Brown 10194f86d3a8SLen Brown case ACPI_STATE_C3: 10204f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 10214f86d3a8SLen Brown state->enter = pr->flags.bm_check ? 10224f86d3a8SLen Brown acpi_idle_enter_bm : 10234f86d3a8SLen Brown acpi_idle_enter_simple; 10244f86d3a8SLen Brown break; 10254f86d3a8SLen Brown } 10264f86d3a8SLen Brown 10274f86d3a8SLen Brown count++; 10289a0b8415Svenkatesh.pallipadi@intel.com if (count == CPUIDLE_STATE_MAX) 10299a0b8415Svenkatesh.pallipadi@intel.com break; 10304f86d3a8SLen Brown } 10314f86d3a8SLen Brown 103246bcfad7SDeepthi Dharwar drv->state_count = count; 10334f86d3a8SLen Brown 10344f86d3a8SLen Brown if (!count) 10354f86d3a8SLen Brown return -EINVAL; 10364f86d3a8SLen Brown 10374f86d3a8SLen Brown return 0; 10384f86d3a8SLen Brown } 10394f86d3a8SLen Brown 104046bcfad7SDeepthi Dharwar int acpi_processor_hotplug(struct acpi_processor *pr) 10414f86d3a8SLen Brown { 1042dcb84f33SVenkatesh Pallipadi int ret = 0; 1043e8b1b59dSWei Yongjun struct cpuidle_device *dev; 10444f86d3a8SLen Brown 1045d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 104636a91358SVenkatesh Pallipadi return 0; 104736a91358SVenkatesh Pallipadi 1048bf9b59f2SBartlomiej Zolnierkiewicz if (nocst) 10494f86d3a8SLen Brown return -ENODEV; 10504f86d3a8SLen Brown 10514f86d3a8SLen Brown if (!pr->flags.power_setup_done) 10524f86d3a8SLen Brown return -ENODEV; 10534f86d3a8SLen Brown 1054e8b1b59dSWei Yongjun dev = per_cpu(acpi_cpuidle_device, pr->id); 10554f86d3a8SLen Brown cpuidle_pause_and_lock(); 10563d339dcbSDaniel Lezcano cpuidle_disable_device(dev); 10574f86d3a8SLen Brown acpi_processor_get_power_info(pr); 1058dcb84f33SVenkatesh Pallipadi if (pr->flags.power) { 10596ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(pr, dev); 10603d339dcbSDaniel Lezcano ret = cpuidle_enable_device(dev); 1061dcb84f33SVenkatesh Pallipadi } 10624f86d3a8SLen Brown cpuidle_resume_and_unlock(); 10634f86d3a8SLen Brown 10644f86d3a8SLen Brown return ret; 10654f86d3a8SLen Brown } 10664f86d3a8SLen Brown 106746bcfad7SDeepthi Dharwar int acpi_processor_cst_has_changed(struct acpi_processor *pr) 106846bcfad7SDeepthi Dharwar { 106946bcfad7SDeepthi Dharwar int cpu; 107046bcfad7SDeepthi Dharwar struct acpi_processor *_pr; 10713d339dcbSDaniel Lezcano struct cpuidle_device *dev; 107246bcfad7SDeepthi Dharwar 107346bcfad7SDeepthi Dharwar if (disabled_by_idle_boot_param()) 107446bcfad7SDeepthi Dharwar return 0; 107546bcfad7SDeepthi Dharwar 107646bcfad7SDeepthi Dharwar if (nocst) 107746bcfad7SDeepthi Dharwar return -ENODEV; 107846bcfad7SDeepthi Dharwar 107946bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 108046bcfad7SDeepthi Dharwar return -ENODEV; 108146bcfad7SDeepthi Dharwar 108246bcfad7SDeepthi Dharwar /* 108346bcfad7SDeepthi Dharwar * FIXME: Design the ACPI notification to make it once per 108446bcfad7SDeepthi Dharwar * system instead of once per-cpu. This condition is a hack 108546bcfad7SDeepthi Dharwar * to make the code that updates C-States be called once. 108646bcfad7SDeepthi Dharwar */ 108746bcfad7SDeepthi Dharwar 10889505626dSPaul E. McKenney if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { 108946bcfad7SDeepthi Dharwar 109046bcfad7SDeepthi Dharwar cpuidle_pause_and_lock(); 109146bcfad7SDeepthi Dharwar /* Protect against cpu-hotplug */ 109246bcfad7SDeepthi Dharwar get_online_cpus(); 109346bcfad7SDeepthi Dharwar 109446bcfad7SDeepthi Dharwar /* Disable all cpuidle devices */ 109546bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 109646bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 109746bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 109846bcfad7SDeepthi Dharwar continue; 10993d339dcbSDaniel Lezcano dev = per_cpu(acpi_cpuidle_device, cpu); 11003d339dcbSDaniel Lezcano cpuidle_disable_device(dev); 110146bcfad7SDeepthi Dharwar } 110246bcfad7SDeepthi Dharwar 110346bcfad7SDeepthi Dharwar /* Populate Updated C-state information */ 1104f427e5f1SThomas Schlichter acpi_processor_get_power_info(pr); 110546bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 110646bcfad7SDeepthi Dharwar 110746bcfad7SDeepthi Dharwar /* Enable all cpuidle devices */ 110846bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 110946bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 111046bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 111146bcfad7SDeepthi Dharwar continue; 111246bcfad7SDeepthi Dharwar acpi_processor_get_power_info(_pr); 111346bcfad7SDeepthi Dharwar if (_pr->flags.power) { 11143d339dcbSDaniel Lezcano dev = per_cpu(acpi_cpuidle_device, cpu); 11156ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(_pr, dev); 11163d339dcbSDaniel Lezcano cpuidle_enable_device(dev); 111746bcfad7SDeepthi Dharwar } 111846bcfad7SDeepthi Dharwar } 111946bcfad7SDeepthi Dharwar put_online_cpus(); 112046bcfad7SDeepthi Dharwar cpuidle_resume_and_unlock(); 112146bcfad7SDeepthi Dharwar } 112246bcfad7SDeepthi Dharwar 112346bcfad7SDeepthi Dharwar return 0; 112446bcfad7SDeepthi Dharwar } 112546bcfad7SDeepthi Dharwar 112646bcfad7SDeepthi Dharwar static int acpi_processor_registered; 112746bcfad7SDeepthi Dharwar 1128fe7bf106SPaul Gortmaker int acpi_processor_power_init(struct acpi_processor *pr) 11291da177e4SLinus Torvalds { 11301da177e4SLinus Torvalds acpi_status status = 0; 113146bcfad7SDeepthi Dharwar int retval; 11323d339dcbSDaniel Lezcano struct cpuidle_device *dev; 1133b6835052SAndreas Mohr static int first_run; 11341da177e4SLinus Torvalds 1135d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 113636a91358SVenkatesh Pallipadi return 0; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds if (!first_run) { 11391da177e4SLinus Torvalds dmi_check_system(processor_power_dmi_table); 1140c1c30634SAlexey Starikovskiy max_cstate = acpi_processor_cstate_check(max_cstate); 11411da177e4SLinus Torvalds if (max_cstate < ACPI_C_STATES_MAX) 11424be44fcdSLen Brown printk(KERN_NOTICE 11434be44fcdSLen Brown "ACPI: processor limited to max C-state %d\n", 11444be44fcdSLen Brown max_cstate); 11451da177e4SLinus Torvalds first_run++; 11461da177e4SLinus Torvalds } 11471da177e4SLinus Torvalds 1148cee324b1SAlexey Starikovskiy if (acpi_gbl_FADT.cst_control && !nocst) { 11494be44fcdSLen Brown status = 1150cee324b1SAlexey Starikovskiy acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); 11511da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 1152a6fc6720SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, 1153a6fc6720SThomas Renninger "Notifying BIOS of _CST ability failed")); 11541da177e4SLinus Torvalds } 11551da177e4SLinus Torvalds } 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds acpi_processor_get_power_info(pr); 11584f86d3a8SLen Brown pr->flags.power_setup_done = 1; 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds /* 11611da177e4SLinus Torvalds * Install the idle handler if processor power management is supported. 11621da177e4SLinus Torvalds * Note that we use previously set idle handler will be used on 11631da177e4SLinus Torvalds * platforms that only support C1. 11641da177e4SLinus Torvalds */ 116536a91358SVenkatesh Pallipadi if (pr->flags.power) { 116646bcfad7SDeepthi Dharwar /* Register acpi_idle_driver if not already registered */ 116746bcfad7SDeepthi Dharwar if (!acpi_processor_registered) { 116846bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 116946bcfad7SDeepthi Dharwar retval = cpuidle_register_driver(&acpi_idle_driver); 117046bcfad7SDeepthi Dharwar if (retval) 117146bcfad7SDeepthi Dharwar return retval; 117246bcfad7SDeepthi Dharwar printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", 117346bcfad7SDeepthi Dharwar acpi_idle_driver.name); 117446bcfad7SDeepthi Dharwar } 11753d339dcbSDaniel Lezcano 11763d339dcbSDaniel Lezcano dev = kzalloc(sizeof(*dev), GFP_KERNEL); 11773d339dcbSDaniel Lezcano if (!dev) 11783d339dcbSDaniel Lezcano return -ENOMEM; 11793d339dcbSDaniel Lezcano per_cpu(acpi_cpuidle_device, pr->id) = dev; 11803d339dcbSDaniel Lezcano 11816ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(pr, dev); 11823d339dcbSDaniel Lezcano 118346bcfad7SDeepthi Dharwar /* Register per-cpu cpuidle_device. Cpuidle driver 118446bcfad7SDeepthi Dharwar * must already be registered before registering device 118546bcfad7SDeepthi Dharwar */ 11863d339dcbSDaniel Lezcano retval = cpuidle_register_device(dev); 118746bcfad7SDeepthi Dharwar if (retval) { 118846bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 118946bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 119046bcfad7SDeepthi Dharwar return retval; 119146bcfad7SDeepthi Dharwar } 119246bcfad7SDeepthi Dharwar acpi_processor_registered++; 11931da177e4SLinus Torvalds } 1194d550d98dSPatrick Mochel return 0; 11951da177e4SLinus Torvalds } 11961da177e4SLinus Torvalds 119738a991b6SDaniel Lezcano int acpi_processor_power_exit(struct acpi_processor *pr) 11981da177e4SLinus Torvalds { 11993d339dcbSDaniel Lezcano struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); 12003d339dcbSDaniel Lezcano 1201d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 120236a91358SVenkatesh Pallipadi return 0; 120336a91358SVenkatesh Pallipadi 120446bcfad7SDeepthi Dharwar if (pr->flags.power) { 12053d339dcbSDaniel Lezcano cpuidle_unregister_device(dev); 120646bcfad7SDeepthi Dharwar acpi_processor_registered--; 120746bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 120846bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 120946bcfad7SDeepthi Dharwar } 12101da177e4SLinus Torvalds 121146bcfad7SDeepthi Dharwar pr->flags.power_setup_done = 0; 1212d550d98dSPatrick Mochel return 0; 12131da177e4SLinus Torvalds } 1214