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 { 3376fd8050aSSudeep Holla acpi_status status; 338439913ffSLin Ming u64 count; 339cf824788SJanosch Machowinski int current_count; 3406fd8050aSSudeep Holla int i, ret = 0; 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"); 3616fd8050aSSudeep Holla ret = -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"); 3706fd8050aSSudeep Holla ret = -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) 4926fd8050aSSudeep Holla ret = -EFAULT; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds end: 49502438d87SLen Brown kfree(buffer.pointer); 4961da177e4SLinus Torvalds 4976fd8050aSSudeep Holla return ret; 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 /** 684b00783fdSRafael J. Wysocki * acpi_idle_do_entry - enter idle state using the appropriate method 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 */ 689b00783fdSRafael J. Wysocki static void acpi_idle_do_entry(struct acpi_processor_cx *cx) 6904f86d3a8SLen Brown { 691bc71bec9Svenkatesh.pallipadi@intel.com if (cx->entry_method == ACPI_CSTATE_FFH) { 6924f86d3a8SLen Brown /* Call into architectural FFH based C-state */ 6934f86d3a8SLen Brown acpi_processor_ffh_cstate_enter(cx); 694bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx->entry_method == ACPI_CSTATE_HALT) { 695bc71bec9Svenkatesh.pallipadi@intel.com acpi_safe_halt(); 6964f86d3a8SLen Brown } else { 6974f86d3a8SLen Brown /* IO port based C-state */ 6984f86d3a8SLen Brown inb(cx->address); 6994f86d3a8SLen Brown /* Dummy wait op - must do something useless after P_LVL2 read 7004f86d3a8SLen Brown because chipsets cannot guarantee that STPCLK# signal 7014f86d3a8SLen Brown gets asserted in time to freeze execution properly. */ 702cfa806f0SAndi Kleen inl(acpi_gbl_FADT.xpm_timer_block.address); 7034f86d3a8SLen Brown } 7044f86d3a8SLen Brown } 7054f86d3a8SLen Brown 7064f86d3a8SLen Brown /** 7071a022e3fSBoris Ostrovsky * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) 7081a022e3fSBoris Ostrovsky * @dev: the target CPU 7091a022e3fSBoris Ostrovsky * @index: the index of suggested state 7101a022e3fSBoris Ostrovsky */ 7111a022e3fSBoris Ostrovsky static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) 7121a022e3fSBoris Ostrovsky { 7136240a10dSAlex Shi struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 7141a022e3fSBoris Ostrovsky 7151a022e3fSBoris Ostrovsky ACPI_FLUSH_CPU_CACHE(); 7161a022e3fSBoris Ostrovsky 7171a022e3fSBoris Ostrovsky while (1) { 7181a022e3fSBoris Ostrovsky 7191a022e3fSBoris Ostrovsky if (cx->entry_method == ACPI_CSTATE_HALT) 72054f70077SLuck, Tony safe_halt(); 7211a022e3fSBoris Ostrovsky else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { 7221a022e3fSBoris Ostrovsky inb(cx->address); 7231a022e3fSBoris Ostrovsky /* See comment in acpi_idle_do_entry() */ 7241a022e3fSBoris Ostrovsky inl(acpi_gbl_FADT.xpm_timer_block.address); 7251a022e3fSBoris Ostrovsky } else 7261a022e3fSBoris Ostrovsky return -ENODEV; 7271a022e3fSBoris Ostrovsky } 7281a022e3fSBoris Ostrovsky 7291a022e3fSBoris Ostrovsky /* Never reached */ 7301a022e3fSBoris Ostrovsky return 0; 7311a022e3fSBoris Ostrovsky } 7321a022e3fSBoris Ostrovsky 733adcb2623SRafael J. Wysocki static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr) 734adcb2623SRafael J. Wysocki { 7355f508185SRafael J. Wysocki return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst && 7365f508185SRafael J. Wysocki !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED); 737adcb2623SRafael J. Wysocki } 738adcb2623SRafael J. Wysocki 7394f86d3a8SLen Brown static int c3_cpu_count; 740e12f65f7SThomas Gleixner static DEFINE_RAW_SPINLOCK(c3_lock); 7414f86d3a8SLen Brown 7424f86d3a8SLen Brown /** 7434f86d3a8SLen Brown * acpi_idle_enter_bm - enters C3 with proper BM handling 7446491bc0cSRafael J. Wysocki * @pr: Target processor 7456491bc0cSRafael J. Wysocki * @cx: Target state context 7465f508185SRafael J. Wysocki * @timer_bc: Whether or not to change timer mode to broadcast 7474f86d3a8SLen Brown */ 7486491bc0cSRafael J. Wysocki static void acpi_idle_enter_bm(struct acpi_processor *pr, 7495f508185SRafael J. Wysocki struct acpi_processor_cx *cx, bool timer_bc) 7504f86d3a8SLen Brown { 751996520c1SVenki Pallipadi acpi_unlazy_tlb(smp_processor_id()); 752996520c1SVenki Pallipadi 7534f86d3a8SLen Brown /* 7544f86d3a8SLen Brown * Must be done before busmaster disable as we might need to 7554f86d3a8SLen Brown * access HPET ! 7564f86d3a8SLen Brown */ 7575f508185SRafael J. Wysocki if (timer_bc) 7587e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 1); 7594f86d3a8SLen Brown 760c9c860e5SVenkatesh Pallipadi /* 761c9c860e5SVenkatesh Pallipadi * disable bus master 762c9c860e5SVenkatesh Pallipadi * bm_check implies we need ARB_DIS 763c9c860e5SVenkatesh Pallipadi * bm_control implies whether we can do ARB_DIS 764c9c860e5SVenkatesh Pallipadi * 765c9c860e5SVenkatesh Pallipadi * That leaves a case where bm_check is set and bm_control is 766c9c860e5SVenkatesh Pallipadi * not set. In that case we cannot do much, we enter C3 767c9c860e5SVenkatesh Pallipadi * without doing anything. 768c9c860e5SVenkatesh Pallipadi */ 7692a738352SRafael J. Wysocki if (pr->flags.bm_control) { 770e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 7714f86d3a8SLen Brown c3_cpu_count++; 7724f86d3a8SLen Brown /* Disable bus master arbitration when all CPUs are in C3 */ 7734f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 77450ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); 775e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 776c9c860e5SVenkatesh Pallipadi } 7774f86d3a8SLen Brown 7784f86d3a8SLen Brown acpi_idle_do_entry(cx); 7794f86d3a8SLen Brown 7804f86d3a8SLen Brown /* Re-enable bus master arbitration */ 7812a738352SRafael J. Wysocki if (pr->flags.bm_control) { 782e12f65f7SThomas Gleixner raw_spin_lock(&c3_lock); 78350ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); 7844f86d3a8SLen Brown c3_cpu_count--; 785e12f65f7SThomas Gleixner raw_spin_unlock(&c3_lock); 7864f86d3a8SLen Brown } 7874f86d3a8SLen Brown 7885f508185SRafael J. Wysocki if (timer_bc) 7897e275cc4SLen Brown lapic_timer_state_broadcast(pr, cx, 0); 7906491bc0cSRafael J. Wysocki } 7916491bc0cSRafael J. Wysocki 7926491bc0cSRafael J. Wysocki static int acpi_idle_enter(struct cpuidle_device *dev, 7936491bc0cSRafael J. Wysocki struct cpuidle_driver *drv, int index) 7946491bc0cSRafael J. Wysocki { 7956491bc0cSRafael J. Wysocki struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 7966491bc0cSRafael J. Wysocki struct acpi_processor *pr; 7976491bc0cSRafael J. Wysocki 7986491bc0cSRafael J. Wysocki pr = __this_cpu_read(processors); 7996491bc0cSRafael J. Wysocki if (unlikely(!pr)) 8006491bc0cSRafael J. Wysocki return -EINVAL; 8016491bc0cSRafael J. Wysocki 8026491bc0cSRafael J. Wysocki if (cx->type != ACPI_STATE_C1) { 8035f508185SRafael J. Wysocki if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) { 8046491bc0cSRafael J. Wysocki index = CPUIDLE_DRIVER_STATE_START; 8056491bc0cSRafael J. Wysocki cx = per_cpu(acpi_cstate[index], dev->cpu); 8066491bc0cSRafael J. Wysocki } else if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check) { 8076491bc0cSRafael J. Wysocki if (cx->bm_sts_skip || !acpi_idle_bm_check()) { 8085f508185SRafael J. Wysocki acpi_idle_enter_bm(pr, cx, true); 8096491bc0cSRafael J. Wysocki return index; 8106491bc0cSRafael J. Wysocki } else if (drv->safe_state_index >= 0) { 8116491bc0cSRafael J. Wysocki index = drv->safe_state_index; 8126491bc0cSRafael J. Wysocki cx = per_cpu(acpi_cstate[index], dev->cpu); 8136491bc0cSRafael J. Wysocki } else { 8146491bc0cSRafael J. Wysocki acpi_safe_halt(); 8156491bc0cSRafael J. Wysocki return -EBUSY; 8166491bc0cSRafael J. Wysocki } 8176491bc0cSRafael J. Wysocki } 8186491bc0cSRafael J. Wysocki } 8196491bc0cSRafael J. Wysocki 8206491bc0cSRafael J. Wysocki lapic_timer_state_broadcast(pr, cx, 1); 8216491bc0cSRafael J. Wysocki 8226491bc0cSRafael J. Wysocki if (cx->type == ACPI_STATE_C3) 8236491bc0cSRafael J. Wysocki ACPI_FLUSH_CPU_CACHE(); 8246491bc0cSRafael J. Wysocki 8256491bc0cSRafael J. Wysocki acpi_idle_do_entry(cx); 8266491bc0cSRafael J. Wysocki 8276491bc0cSRafael J. Wysocki lapic_timer_state_broadcast(pr, cx, 0); 8286491bc0cSRafael J. Wysocki 829e978aa7dSDeepthi Dharwar return index; 8304f86d3a8SLen Brown } 8314f86d3a8SLen Brown 8325f508185SRafael J. Wysocki static void acpi_idle_enter_freeze(struct cpuidle_device *dev, 8335f508185SRafael J. Wysocki struct cpuidle_driver *drv, int index) 8345f508185SRafael J. Wysocki { 8355f508185SRafael J. Wysocki struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); 8365f508185SRafael J. Wysocki 8375f508185SRafael J. Wysocki if (cx->type == ACPI_STATE_C3) { 8385f508185SRafael J. Wysocki struct acpi_processor *pr = __this_cpu_read(processors); 8395f508185SRafael J. Wysocki 8405f508185SRafael J. Wysocki if (unlikely(!pr)) 8415f508185SRafael J. Wysocki return; 8425f508185SRafael J. Wysocki 8435f508185SRafael J. Wysocki if (pr->flags.bm_check) { 8445f508185SRafael J. Wysocki acpi_idle_enter_bm(pr, cx, false); 8455f508185SRafael J. Wysocki return; 8465f508185SRafael J. Wysocki } else { 8475f508185SRafael J. Wysocki ACPI_FLUSH_CPU_CACHE(); 8485f508185SRafael J. Wysocki } 8495f508185SRafael J. Wysocki } 8505f508185SRafael J. Wysocki acpi_idle_do_entry(cx); 8515f508185SRafael J. Wysocki } 8525f508185SRafael J. Wysocki 8534f86d3a8SLen Brown struct cpuidle_driver acpi_idle_driver = { 8544f86d3a8SLen Brown .name = "acpi_idle", 8554f86d3a8SLen Brown .owner = THIS_MODULE, 8564f86d3a8SLen Brown }; 8574f86d3a8SLen Brown 8584f86d3a8SLen Brown /** 85946bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE 86046bcfad7SDeepthi Dharwar * device i.e. per-cpu data 86146bcfad7SDeepthi Dharwar * 8624f86d3a8SLen Brown * @pr: the ACPI processor 8636ef0f086SDaniel Lezcano * @dev : the cpuidle device 8644f86d3a8SLen Brown */ 8656ef0f086SDaniel Lezcano static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, 8666ef0f086SDaniel Lezcano struct cpuidle_device *dev) 8674f86d3a8SLen Brown { 8689a0b8415Svenkatesh.pallipadi@intel.com int i, count = CPUIDLE_DRIVER_STATE_START; 8694f86d3a8SLen Brown struct acpi_processor_cx *cx; 8704f86d3a8SLen Brown 8714f86d3a8SLen Brown if (!pr->flags.power_setup_done) 8724f86d3a8SLen Brown return -EINVAL; 8734f86d3a8SLen Brown 8744f86d3a8SLen Brown if (pr->flags.power == 0) { 8754f86d3a8SLen Brown return -EINVAL; 8764f86d3a8SLen Brown } 8774f86d3a8SLen Brown 878b88a634aSKonrad Rzeszutek Wilk if (!dev) 879b88a634aSKonrad Rzeszutek Wilk return -EINVAL; 880b88a634aSKonrad Rzeszutek Wilk 881dcb84f33SVenkatesh Pallipadi dev->cpu = pr->id; 8824fcb2fcdSVenkatesh Pallipadi 883615dfd93SLen Brown if (max_cstate == 0) 884615dfd93SLen Brown max_cstate = 1; 885615dfd93SLen Brown 8864f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 8874f86d3a8SLen Brown cx = &pr->power.states[i]; 8884f86d3a8SLen Brown 8894f86d3a8SLen Brown if (!cx->valid) 8904f86d3a8SLen Brown continue; 8914f86d3a8SLen Brown 8926240a10dSAlex Shi per_cpu(acpi_cstate[count], dev->cpu) = cx; 8934f86d3a8SLen Brown 89446bcfad7SDeepthi Dharwar count++; 89546bcfad7SDeepthi Dharwar if (count == CPUIDLE_STATE_MAX) 89646bcfad7SDeepthi Dharwar break; 89746bcfad7SDeepthi Dharwar } 89846bcfad7SDeepthi Dharwar 89946bcfad7SDeepthi Dharwar if (!count) 90046bcfad7SDeepthi Dharwar return -EINVAL; 90146bcfad7SDeepthi Dharwar 90246bcfad7SDeepthi Dharwar return 0; 90346bcfad7SDeepthi Dharwar } 90446bcfad7SDeepthi Dharwar 90546bcfad7SDeepthi Dharwar /** 90646bcfad7SDeepthi Dharwar * acpi_processor_setup_cpuidle states- prepares and configures cpuidle 90746bcfad7SDeepthi Dharwar * global state data i.e. idle routines 90846bcfad7SDeepthi Dharwar * 90946bcfad7SDeepthi Dharwar * @pr: the ACPI processor 91046bcfad7SDeepthi Dharwar */ 91146bcfad7SDeepthi Dharwar static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) 91246bcfad7SDeepthi Dharwar { 91346bcfad7SDeepthi Dharwar int i, count = CPUIDLE_DRIVER_STATE_START; 91446bcfad7SDeepthi Dharwar struct acpi_processor_cx *cx; 91546bcfad7SDeepthi Dharwar struct cpuidle_state *state; 91646bcfad7SDeepthi Dharwar struct cpuidle_driver *drv = &acpi_idle_driver; 91746bcfad7SDeepthi Dharwar 91846bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 91946bcfad7SDeepthi Dharwar return -EINVAL; 92046bcfad7SDeepthi Dharwar 92146bcfad7SDeepthi Dharwar if (pr->flags.power == 0) 92246bcfad7SDeepthi Dharwar return -EINVAL; 92346bcfad7SDeepthi Dharwar 92446bcfad7SDeepthi Dharwar drv->safe_state_index = -1; 925c7e8bdf5SThomas Schlichter for (i = CPUIDLE_DRIVER_STATE_START; i < CPUIDLE_STATE_MAX; i++) { 92646bcfad7SDeepthi Dharwar drv->states[i].name[0] = '\0'; 92746bcfad7SDeepthi Dharwar drv->states[i].desc[0] = '\0'; 92846bcfad7SDeepthi Dharwar } 92946bcfad7SDeepthi Dharwar 93046bcfad7SDeepthi Dharwar if (max_cstate == 0) 93146bcfad7SDeepthi Dharwar max_cstate = 1; 93246bcfad7SDeepthi Dharwar 93346bcfad7SDeepthi Dharwar for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 93446bcfad7SDeepthi Dharwar cx = &pr->power.states[i]; 93546bcfad7SDeepthi Dharwar 93646bcfad7SDeepthi Dharwar if (!cx->valid) 93746bcfad7SDeepthi Dharwar continue; 93846bcfad7SDeepthi Dharwar 93946bcfad7SDeepthi Dharwar state = &drv->states[count]; 9404f86d3a8SLen Brown snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); 9414fcb2fcdSVenkatesh Pallipadi strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 9424f86d3a8SLen Brown state->exit_latency = cx->latency; 9434963f620SLen Brown state->target_residency = cx->latency * latency_factor; 9446491bc0cSRafael J. Wysocki state->enter = acpi_idle_enter; 9454f86d3a8SLen Brown 9464f86d3a8SLen Brown state->flags = 0; 9476491bc0cSRafael J. Wysocki if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) { 9481a022e3fSBoris Ostrovsky state->enter_dead = acpi_idle_play_dead; 94946bcfad7SDeepthi Dharwar drv->safe_state_index = count; 9504f86d3a8SLen Brown } 9515f508185SRafael J. Wysocki /* 9525f508185SRafael J. Wysocki * Halt-induced C1 is not good for ->enter_freeze, because it 9535f508185SRafael J. Wysocki * re-enables interrupts on exit. Moreover, C1 is generally not 9545f508185SRafael J. Wysocki * particularly interesting from the suspend-to-idle angle, so 9555f508185SRafael J. Wysocki * avoid C1 and the situations in which we may need to fall back 9565f508185SRafael J. Wysocki * to it altogether. 9575f508185SRafael J. Wysocki */ 9585f508185SRafael J. Wysocki if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr)) 9595f508185SRafael J. Wysocki state->enter_freeze = acpi_idle_enter_freeze; 9604f86d3a8SLen Brown 9614f86d3a8SLen Brown count++; 9629a0b8415Svenkatesh.pallipadi@intel.com if (count == CPUIDLE_STATE_MAX) 9639a0b8415Svenkatesh.pallipadi@intel.com break; 9644f86d3a8SLen Brown } 9654f86d3a8SLen Brown 96646bcfad7SDeepthi Dharwar drv->state_count = count; 9674f86d3a8SLen Brown 9684f86d3a8SLen Brown if (!count) 9694f86d3a8SLen Brown return -EINVAL; 9704f86d3a8SLen Brown 9714f86d3a8SLen Brown return 0; 9724f86d3a8SLen Brown } 9734f86d3a8SLen Brown 97446bcfad7SDeepthi Dharwar int acpi_processor_hotplug(struct acpi_processor *pr) 9754f86d3a8SLen Brown { 976dcb84f33SVenkatesh Pallipadi int ret = 0; 977e8b1b59dSWei Yongjun struct cpuidle_device *dev; 9784f86d3a8SLen Brown 979d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 98036a91358SVenkatesh Pallipadi return 0; 98136a91358SVenkatesh Pallipadi 982bf9b59f2SBartlomiej Zolnierkiewicz if (nocst) 9834f86d3a8SLen Brown return -ENODEV; 9844f86d3a8SLen Brown 9854f86d3a8SLen Brown if (!pr->flags.power_setup_done) 9864f86d3a8SLen Brown return -ENODEV; 9874f86d3a8SLen Brown 988e8b1b59dSWei Yongjun dev = per_cpu(acpi_cpuidle_device, pr->id); 9894f86d3a8SLen Brown cpuidle_pause_and_lock(); 9903d339dcbSDaniel Lezcano cpuidle_disable_device(dev); 9914f86d3a8SLen Brown acpi_processor_get_power_info(pr); 992dcb84f33SVenkatesh Pallipadi if (pr->flags.power) { 9936ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(pr, dev); 9943d339dcbSDaniel Lezcano ret = cpuidle_enable_device(dev); 995dcb84f33SVenkatesh Pallipadi } 9964f86d3a8SLen Brown cpuidle_resume_and_unlock(); 9974f86d3a8SLen Brown 9984f86d3a8SLen Brown return ret; 9994f86d3a8SLen Brown } 10004f86d3a8SLen Brown 100146bcfad7SDeepthi Dharwar int acpi_processor_cst_has_changed(struct acpi_processor *pr) 100246bcfad7SDeepthi Dharwar { 100346bcfad7SDeepthi Dharwar int cpu; 100446bcfad7SDeepthi Dharwar struct acpi_processor *_pr; 10053d339dcbSDaniel Lezcano struct cpuidle_device *dev; 100646bcfad7SDeepthi Dharwar 100746bcfad7SDeepthi Dharwar if (disabled_by_idle_boot_param()) 100846bcfad7SDeepthi Dharwar return 0; 100946bcfad7SDeepthi Dharwar 101046bcfad7SDeepthi Dharwar if (nocst) 101146bcfad7SDeepthi Dharwar return -ENODEV; 101246bcfad7SDeepthi Dharwar 101346bcfad7SDeepthi Dharwar if (!pr->flags.power_setup_done) 101446bcfad7SDeepthi Dharwar return -ENODEV; 101546bcfad7SDeepthi Dharwar 101646bcfad7SDeepthi Dharwar /* 101746bcfad7SDeepthi Dharwar * FIXME: Design the ACPI notification to make it once per 101846bcfad7SDeepthi Dharwar * system instead of once per-cpu. This condition is a hack 101946bcfad7SDeepthi Dharwar * to make the code that updates C-States be called once. 102046bcfad7SDeepthi Dharwar */ 102146bcfad7SDeepthi Dharwar 10229505626dSPaul E. McKenney if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { 102346bcfad7SDeepthi Dharwar 102446bcfad7SDeepthi Dharwar /* Protect against cpu-hotplug */ 102546bcfad7SDeepthi Dharwar get_online_cpus(); 10266726655dSJiri Kosina cpuidle_pause_and_lock(); 102746bcfad7SDeepthi Dharwar 102846bcfad7SDeepthi Dharwar /* Disable all cpuidle devices */ 102946bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 103046bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 103146bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 103246bcfad7SDeepthi Dharwar continue; 10333d339dcbSDaniel Lezcano dev = per_cpu(acpi_cpuidle_device, cpu); 10343d339dcbSDaniel Lezcano cpuidle_disable_device(dev); 103546bcfad7SDeepthi Dharwar } 103646bcfad7SDeepthi Dharwar 103746bcfad7SDeepthi Dharwar /* Populate Updated C-state information */ 1038f427e5f1SThomas Schlichter acpi_processor_get_power_info(pr); 103946bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 104046bcfad7SDeepthi Dharwar 104146bcfad7SDeepthi Dharwar /* Enable all cpuidle devices */ 104246bcfad7SDeepthi Dharwar for_each_online_cpu(cpu) { 104346bcfad7SDeepthi Dharwar _pr = per_cpu(processors, cpu); 104446bcfad7SDeepthi Dharwar if (!_pr || !_pr->flags.power_setup_done) 104546bcfad7SDeepthi Dharwar continue; 104646bcfad7SDeepthi Dharwar acpi_processor_get_power_info(_pr); 104746bcfad7SDeepthi Dharwar if (_pr->flags.power) { 10483d339dcbSDaniel Lezcano dev = per_cpu(acpi_cpuidle_device, cpu); 10496ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(_pr, dev); 10503d339dcbSDaniel Lezcano cpuidle_enable_device(dev); 105146bcfad7SDeepthi Dharwar } 105246bcfad7SDeepthi Dharwar } 105346bcfad7SDeepthi Dharwar cpuidle_resume_and_unlock(); 10546726655dSJiri Kosina put_online_cpus(); 105546bcfad7SDeepthi Dharwar } 105646bcfad7SDeepthi Dharwar 105746bcfad7SDeepthi Dharwar return 0; 105846bcfad7SDeepthi Dharwar } 105946bcfad7SDeepthi Dharwar 106046bcfad7SDeepthi Dharwar static int acpi_processor_registered; 106146bcfad7SDeepthi Dharwar 1062fe7bf106SPaul Gortmaker int acpi_processor_power_init(struct acpi_processor *pr) 10631da177e4SLinus Torvalds { 10646fd8050aSSudeep Holla acpi_status status; 106546bcfad7SDeepthi Dharwar int retval; 10663d339dcbSDaniel Lezcano struct cpuidle_device *dev; 1067b6835052SAndreas Mohr static int first_run; 10681da177e4SLinus Torvalds 1069d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 107036a91358SVenkatesh Pallipadi return 0; 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds if (!first_run) { 10731da177e4SLinus Torvalds dmi_check_system(processor_power_dmi_table); 1074c1c30634SAlexey Starikovskiy max_cstate = acpi_processor_cstate_check(max_cstate); 10751da177e4SLinus Torvalds if (max_cstate < ACPI_C_STATES_MAX) 10764be44fcdSLen Brown printk(KERN_NOTICE 10774be44fcdSLen Brown "ACPI: processor limited to max C-state %d\n", 10784be44fcdSLen Brown max_cstate); 10791da177e4SLinus Torvalds first_run++; 10801da177e4SLinus Torvalds } 10811da177e4SLinus Torvalds 1082cee324b1SAlexey Starikovskiy if (acpi_gbl_FADT.cst_control && !nocst) { 10834be44fcdSLen Brown status = 1084cee324b1SAlexey Starikovskiy acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); 10851da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 1086a6fc6720SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, 1087a6fc6720SThomas Renninger "Notifying BIOS of _CST ability failed")); 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds acpi_processor_get_power_info(pr); 10924f86d3a8SLen Brown pr->flags.power_setup_done = 1; 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds /* 10951da177e4SLinus Torvalds * Install the idle handler if processor power management is supported. 10961da177e4SLinus Torvalds * Note that we use previously set idle handler will be used on 10971da177e4SLinus Torvalds * platforms that only support C1. 10981da177e4SLinus Torvalds */ 109936a91358SVenkatesh Pallipadi if (pr->flags.power) { 110046bcfad7SDeepthi Dharwar /* Register acpi_idle_driver if not already registered */ 110146bcfad7SDeepthi Dharwar if (!acpi_processor_registered) { 110246bcfad7SDeepthi Dharwar acpi_processor_setup_cpuidle_states(pr); 110346bcfad7SDeepthi Dharwar retval = cpuidle_register_driver(&acpi_idle_driver); 110446bcfad7SDeepthi Dharwar if (retval) 110546bcfad7SDeepthi Dharwar return retval; 110646bcfad7SDeepthi Dharwar printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", 110746bcfad7SDeepthi Dharwar acpi_idle_driver.name); 110846bcfad7SDeepthi Dharwar } 11093d339dcbSDaniel Lezcano 11103d339dcbSDaniel Lezcano dev = kzalloc(sizeof(*dev), GFP_KERNEL); 11113d339dcbSDaniel Lezcano if (!dev) 11123d339dcbSDaniel Lezcano return -ENOMEM; 11133d339dcbSDaniel Lezcano per_cpu(acpi_cpuidle_device, pr->id) = dev; 11143d339dcbSDaniel Lezcano 11156ef0f086SDaniel Lezcano acpi_processor_setup_cpuidle_cx(pr, dev); 11163d339dcbSDaniel Lezcano 111746bcfad7SDeepthi Dharwar /* Register per-cpu cpuidle_device. Cpuidle driver 111846bcfad7SDeepthi Dharwar * must already be registered before registering device 111946bcfad7SDeepthi Dharwar */ 11203d339dcbSDaniel Lezcano retval = cpuidle_register_device(dev); 112146bcfad7SDeepthi Dharwar if (retval) { 112246bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 112346bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 112446bcfad7SDeepthi Dharwar return retval; 112546bcfad7SDeepthi Dharwar } 112646bcfad7SDeepthi Dharwar acpi_processor_registered++; 11271da177e4SLinus Torvalds } 1128d550d98dSPatrick Mochel return 0; 11291da177e4SLinus Torvalds } 11301da177e4SLinus Torvalds 113138a991b6SDaniel Lezcano int acpi_processor_power_exit(struct acpi_processor *pr) 11321da177e4SLinus Torvalds { 11333d339dcbSDaniel Lezcano struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); 11343d339dcbSDaniel Lezcano 1135d1896049SThomas Renninger if (disabled_by_idle_boot_param()) 113636a91358SVenkatesh Pallipadi return 0; 113736a91358SVenkatesh Pallipadi 113846bcfad7SDeepthi Dharwar if (pr->flags.power) { 11393d339dcbSDaniel Lezcano cpuidle_unregister_device(dev); 114046bcfad7SDeepthi Dharwar acpi_processor_registered--; 114146bcfad7SDeepthi Dharwar if (acpi_processor_registered == 0) 114246bcfad7SDeepthi Dharwar cpuidle_unregister_driver(&acpi_idle_driver); 114346bcfad7SDeepthi Dharwar } 11441da177e4SLinus Torvalds 114546bcfad7SDeepthi Dharwar pr->flags.power_setup_done = 0; 1146d550d98dSPatrick Mochel return 0; 11471da177e4SLinus Torvalds } 1148