11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * processor_idle - idle state submodule to the ACPI processor driver 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 51da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6c5ab81caSDominik Brodowski * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> 71da177e4SLinus Torvalds * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 81da177e4SLinus Torvalds * - Added processor hotplug support 902df8b93SVenkatesh Pallipadi * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 1002df8b93SVenkatesh Pallipadi * - Added support for C3 on SMP 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 151da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or (at 171da177e4SLinus Torvalds * your option) any later version. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, but 201da177e4SLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 211da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 221da177e4SLinus Torvalds * General Public License for more details. 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License along 251da177e4SLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 261da177e4SLinus Torvalds * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 271da177e4SLinus Torvalds * 281da177e4SLinus Torvalds * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 291da177e4SLinus Torvalds */ 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <linux/kernel.h> 321da177e4SLinus Torvalds #include <linux/module.h> 331da177e4SLinus Torvalds #include <linux/init.h> 341da177e4SLinus Torvalds #include <linux/cpufreq.h> 351da177e4SLinus Torvalds #include <linux/proc_fs.h> 361da177e4SLinus Torvalds #include <linux/seq_file.h> 371da177e4SLinus Torvalds #include <linux/acpi.h> 381da177e4SLinus Torvalds #include <linux/dmi.h> 391da177e4SLinus Torvalds #include <linux/moduleparam.h> 404e57b681STim Schmielau #include <linux/sched.h> /* need_resched() */ 41f011e2e2SMark Gross #include <linux/pm_qos_params.h> 42e9e2cdb4SThomas Gleixner #include <linux/clockchips.h> 434f86d3a8SLen Brown #include <linux/cpuidle.h> 44ba84be23SRussell King #include <linux/irqflags.h> 451da177e4SLinus Torvalds 463434933bSThomas Gleixner /* 473434933bSThomas Gleixner * Include the apic definitions for x86 to have the APIC timer related defines 483434933bSThomas Gleixner * available also for UP (on SMP it gets magically included via linux/smp.h). 493434933bSThomas Gleixner * asm/acpi.h is not an option, as it would require more include magic. Also 503434933bSThomas Gleixner * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. 513434933bSThomas Gleixner */ 523434933bSThomas Gleixner #ifdef CONFIG_X86 533434933bSThomas Gleixner #include <asm/apic.h> 543434933bSThomas Gleixner #endif 553434933bSThomas Gleixner 561da177e4SLinus Torvalds #include <asm/io.h> 571da177e4SLinus Torvalds #include <asm/uaccess.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <acpi/acpi_bus.h> 601da177e4SLinus Torvalds #include <acpi/processor.h> 61c1e3b377SZhao Yakui #include <asm/processor.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #define ACPI_PROCESSOR_CLASS "processor" 641da177e4SLinus Torvalds #define _COMPONENT ACPI_PROCESSOR_COMPONENT 65f52fd66dSLen Brown ACPI_MODULE_NAME("processor_idle"); 661da177e4SLinus Torvalds #define ACPI_PROCESSOR_FILE_POWER "power" 672aa44d05SIngo Molnar #define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) 684f86d3a8SLen Brown #define C2_OVERHEAD 1 /* 1us */ 694f86d3a8SLen Brown #define C3_OVERHEAD 1 /* 1us */ 704f86d3a8SLen Brown #define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) 711da177e4SLinus Torvalds 724f86d3a8SLen Brown static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; 734f86d3a8SLen Brown module_param(max_cstate, uint, 0000); 74b6835052SAndreas Mohr static unsigned int nocst __read_mostly; 751da177e4SLinus Torvalds module_param(nocst, uint, 0000); 761da177e4SLinus Torvalds 7725de5718SLen Brown static unsigned int latency_factor __read_mostly = 2; 784963f620SLen Brown module_param(latency_factor, uint, 0644); 791da177e4SLinus Torvalds 80ff69f2bbSalex.shi static s64 us_to_pm_timer_ticks(s64 t) 81ff69f2bbSalex.shi { 82ff69f2bbSalex.shi return div64_u64(t * PM_TIMER_FREQUENCY, 1000000); 83ff69f2bbSalex.shi } 841da177e4SLinus Torvalds /* 851da177e4SLinus Torvalds * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. 861da177e4SLinus Torvalds * For now disable this. Probably a bug somewhere else. 871da177e4SLinus Torvalds * 881da177e4SLinus Torvalds * To skip this limit, boot/load with a large max_cstate limit. 891da177e4SLinus Torvalds */ 901855256cSJeff Garzik static int set_max_cstate(const struct dmi_system_id *id) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds if (max_cstate > ACPI_PROCESSOR_MAX_POWER) 931da177e4SLinus Torvalds return 0; 941da177e4SLinus Torvalds 953d35600aSLen Brown printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." 961da177e4SLinus Torvalds " Override with \"processor.max_cstate=%d\"\n", id->ident, 973d35600aSLen Brown (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); 981da177e4SLinus Torvalds 993d35600aSLen Brown max_cstate = (long)id->driver_data; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds return 0; 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds 1047ded5689SAshok Raj /* Actually this shouldn't be __cpuinitdata, would be better to fix the 1057ded5689SAshok Raj callers to only run once -AK */ 1067ded5689SAshok Raj static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = { 107335f16beSDavid Shaohua Li { set_max_cstate, "Clevo 5600D", { 108876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), 109876c184bSThomas Rosner DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, 110335f16beSDavid Shaohua Li (void *)2}, 1111da177e4SLinus Torvalds {}, 1121da177e4SLinus Torvalds }; 1131da177e4SLinus Torvalds 1144f86d3a8SLen Brown 1152e906655Svenkatesh.pallipadi@intel.com /* 1162e906655Svenkatesh.pallipadi@intel.com * Callers should disable interrupts before the call and enable 1172e906655Svenkatesh.pallipadi@intel.com * interrupts after return. 1182e906655Svenkatesh.pallipadi@intel.com */ 119ddc081a1SVenkatesh Pallipadi static void acpi_safe_halt(void) 120ddc081a1SVenkatesh Pallipadi { 121ddc081a1SVenkatesh Pallipadi current_thread_info()->status &= ~TS_POLLING; 122ddc081a1SVenkatesh Pallipadi /* 123ddc081a1SVenkatesh Pallipadi * TS_POLLING-cleared state must be visible before we 124ddc081a1SVenkatesh Pallipadi * test NEED_RESCHED: 125ddc081a1SVenkatesh Pallipadi */ 126ddc081a1SVenkatesh Pallipadi smp_mb(); 12771e93d15SVenki Pallipadi if (!need_resched()) { 128ddc081a1SVenkatesh Pallipadi safe_halt(); 12971e93d15SVenki Pallipadi local_irq_disable(); 13071e93d15SVenki Pallipadi } 131ddc081a1SVenkatesh Pallipadi current_thread_info()->status |= TS_POLLING; 132ddc081a1SVenkatesh Pallipadi } 133ddc081a1SVenkatesh Pallipadi 134169a0abbSThomas Gleixner #ifdef ARCH_APICTIMER_STOPS_ON_C3 135169a0abbSThomas Gleixner 136169a0abbSThomas Gleixner /* 137169a0abbSThomas Gleixner * Some BIOS implementations switch to C3 in the published C2 state. 138296d93cdSLinus Torvalds * This seems to be a common problem on AMD boxen, but other vendors 139296d93cdSLinus Torvalds * are affected too. We pick the most conservative approach: we assume 140296d93cdSLinus Torvalds * that the local APIC stops in both C2 and C3. 141169a0abbSThomas Gleixner */ 142169a0abbSThomas Gleixner static void acpi_timer_check_state(int state, struct acpi_processor *pr, 143169a0abbSThomas Gleixner struct acpi_processor_cx *cx) 144169a0abbSThomas Gleixner { 145169a0abbSThomas Gleixner struct acpi_processor_power *pwr = &pr->power; 146e585bef8SThomas Gleixner u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; 147169a0abbSThomas Gleixner 148db954b58SVenkatesh Pallipadi if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) 149db954b58SVenkatesh Pallipadi return; 150db954b58SVenkatesh Pallipadi 151169a0abbSThomas Gleixner /* 152169a0abbSThomas Gleixner * Check, if one of the previous states already marked the lapic 153169a0abbSThomas Gleixner * unstable 154169a0abbSThomas Gleixner */ 155169a0abbSThomas Gleixner if (pwr->timer_broadcast_on_state < state) 156169a0abbSThomas Gleixner return; 157169a0abbSThomas Gleixner 158e585bef8SThomas Gleixner if (cx->type >= type) 159169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = state; 160169a0abbSThomas Gleixner } 161169a0abbSThomas Gleixner 162169a0abbSThomas Gleixner static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) 163169a0abbSThomas Gleixner { 164e9e2cdb4SThomas Gleixner unsigned long reason; 165e9e2cdb4SThomas Gleixner 166e9e2cdb4SThomas Gleixner reason = pr->power.timer_broadcast_on_state < INT_MAX ? 167e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; 168e9e2cdb4SThomas Gleixner 169e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 170e9e2cdb4SThomas Gleixner } 171e9e2cdb4SThomas Gleixner 172e9e2cdb4SThomas Gleixner /* Power(C) State timer broadcast control */ 173e9e2cdb4SThomas Gleixner static void acpi_state_timer_broadcast(struct acpi_processor *pr, 174e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 175e9e2cdb4SThomas Gleixner int broadcast) 176e9e2cdb4SThomas Gleixner { 177e9e2cdb4SThomas Gleixner int state = cx - pr->power.states; 178e9e2cdb4SThomas Gleixner 179e9e2cdb4SThomas Gleixner if (state >= pr->power.timer_broadcast_on_state) { 180e9e2cdb4SThomas Gleixner unsigned long reason; 181e9e2cdb4SThomas Gleixner 182e9e2cdb4SThomas Gleixner reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : 183e9e2cdb4SThomas Gleixner CLOCK_EVT_NOTIFY_BROADCAST_EXIT; 184e9e2cdb4SThomas Gleixner clockevents_notify(reason, &pr->id); 185e9e2cdb4SThomas Gleixner } 186169a0abbSThomas Gleixner } 187169a0abbSThomas Gleixner 188169a0abbSThomas Gleixner #else 189169a0abbSThomas Gleixner 190169a0abbSThomas Gleixner static void acpi_timer_check_state(int state, struct acpi_processor *pr, 191169a0abbSThomas Gleixner struct acpi_processor_cx *cstate) { } 192169a0abbSThomas Gleixner static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { } 193e9e2cdb4SThomas Gleixner static void acpi_state_timer_broadcast(struct acpi_processor *pr, 194e9e2cdb4SThomas Gleixner struct acpi_processor_cx *cx, 195e9e2cdb4SThomas Gleixner int broadcast) 196e9e2cdb4SThomas Gleixner { 197e9e2cdb4SThomas Gleixner } 198169a0abbSThomas Gleixner 199169a0abbSThomas Gleixner #endif 200169a0abbSThomas Gleixner 201b04e7bdbSThomas Gleixner /* 202b04e7bdbSThomas Gleixner * Suspend / resume control 203b04e7bdbSThomas Gleixner */ 204b04e7bdbSThomas Gleixner static int acpi_idle_suspend; 205815ab0fdSLen Brown static u32 saved_bm_rld; 206815ab0fdSLen Brown 207815ab0fdSLen Brown static void acpi_idle_bm_rld_save(void) 208815ab0fdSLen Brown { 209815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 210815ab0fdSLen Brown } 211815ab0fdSLen Brown static void acpi_idle_bm_rld_restore(void) 212815ab0fdSLen Brown { 213815ab0fdSLen Brown u32 resumed_bm_rld; 214815ab0fdSLen Brown 215815ab0fdSLen Brown acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 216815ab0fdSLen Brown 217815ab0fdSLen Brown if (resumed_bm_rld != saved_bm_rld) 218815ab0fdSLen Brown acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 219815ab0fdSLen Brown } 220b04e7bdbSThomas Gleixner 221b04e7bdbSThomas Gleixner int acpi_processor_suspend(struct acpi_device * device, pm_message_t state) 222b04e7bdbSThomas Gleixner { 223815ab0fdSLen Brown if (acpi_idle_suspend == 1) 224815ab0fdSLen Brown return 0; 225815ab0fdSLen Brown 226815ab0fdSLen Brown acpi_idle_bm_rld_save(); 227b04e7bdbSThomas Gleixner acpi_idle_suspend = 1; 228b04e7bdbSThomas Gleixner return 0; 229b04e7bdbSThomas Gleixner } 230b04e7bdbSThomas Gleixner 231b04e7bdbSThomas Gleixner int acpi_processor_resume(struct acpi_device * device) 232b04e7bdbSThomas Gleixner { 233815ab0fdSLen Brown if (acpi_idle_suspend == 0) 234815ab0fdSLen Brown return 0; 235815ab0fdSLen Brown 236815ab0fdSLen Brown acpi_idle_bm_rld_restore(); 237b04e7bdbSThomas Gleixner acpi_idle_suspend = 0; 238b04e7bdbSThomas Gleixner return 0; 239b04e7bdbSThomas Gleixner } 240b04e7bdbSThomas Gleixner 24161331168SPavel Machek #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) 242ddb25f9aSAndi Kleen static int tsc_halts_in_c(int state) 243ddb25f9aSAndi Kleen { 244ddb25f9aSAndi Kleen switch (boot_cpu_data.x86_vendor) { 245ddb25f9aSAndi Kleen case X86_VENDOR_AMD: 24640fb1715SVenki Pallipadi case X86_VENDOR_INTEL: 247ddb25f9aSAndi Kleen /* 248ddb25f9aSAndi Kleen * AMD Fam10h TSC will tick in all 249ddb25f9aSAndi Kleen * C/P/S0/S1 states when this bit is set. 250ddb25f9aSAndi Kleen */ 25140fb1715SVenki Pallipadi if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) 252ddb25f9aSAndi Kleen return 0; 25340fb1715SVenki Pallipadi 254ddb25f9aSAndi Kleen /*FALL THROUGH*/ 255ddb25f9aSAndi Kleen default: 256ddb25f9aSAndi Kleen return state > ACPI_STATE_C1; 257ddb25f9aSAndi Kleen } 258ddb25f9aSAndi Kleen } 259ddb25f9aSAndi Kleen #endif 260ddb25f9aSAndi Kleen 2611da177e4SLinus Torvalds static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds if (!pr) 265d550d98dSPatrick Mochel return -EINVAL; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds if (!pr->pblk) 268d550d98dSPatrick Mochel return -ENODEV; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds /* if info is obtained from pblk/fadt, type equals state */ 2711da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; 2721da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; 2731da177e4SLinus Torvalds 2744c033552SVenkatesh Pallipadi #ifndef CONFIG_HOTPLUG_CPU 2754c033552SVenkatesh Pallipadi /* 2764c033552SVenkatesh Pallipadi * Check for P_LVL2_UP flag before entering C2 and above on 2774c033552SVenkatesh Pallipadi * an SMP system. 2784c033552SVenkatesh Pallipadi */ 279ad71860aSAlexey Starikovskiy if ((num_online_cpus() > 1) && 280cee324b1SAlexey Starikovskiy !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 281d550d98dSPatrick Mochel return -ENODEV; 2824c033552SVenkatesh Pallipadi #endif 2834c033552SVenkatesh Pallipadi 2841da177e4SLinus Torvalds /* determine C2 and C3 address from pblk */ 2851da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; 2861da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* determine latencies from FADT */ 289cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency; 290cee324b1SAlexey Starikovskiy pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 2931da177e4SLinus Torvalds "lvl2[0x%08x] lvl3[0x%08x]\n", 2941da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C2].address, 2951da177e4SLinus Torvalds pr->power.states[ACPI_STATE_C3].address)); 2961da177e4SLinus Torvalds 297d550d98dSPatrick Mochel return 0; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 300991528d7SVenkatesh Pallipadi static int acpi_processor_get_power_info_default(struct acpi_processor *pr) 301acf05f4bSVenkatesh Pallipadi { 302991528d7SVenkatesh Pallipadi if (!pr->power.states[ACPI_STATE_C1].valid) { 303cf824788SJanosch Machowinski /* set the first C-State to C1 */ 304991528d7SVenkatesh Pallipadi /* all processors need to support C1 */ 305acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; 306acf05f4bSVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].valid = 1; 3070fda6b40SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; 308991528d7SVenkatesh Pallipadi } 309991528d7SVenkatesh Pallipadi /* the C0 state only exists as a filler in our array */ 310991528d7SVenkatesh Pallipadi pr->power.states[ACPI_STATE_C0].valid = 1; 311d550d98dSPatrick Mochel return 0; 312acf05f4bSVenkatesh Pallipadi } 313acf05f4bSVenkatesh Pallipadi 3141da177e4SLinus Torvalds static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) 3151da177e4SLinus Torvalds { 3161da177e4SLinus Torvalds acpi_status status = 0; 3171da177e4SLinus Torvalds acpi_integer count; 318cf824788SJanosch Machowinski int current_count; 3191da177e4SLinus Torvalds int i; 3201da177e4SLinus Torvalds struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 3211da177e4SLinus Torvalds union acpi_object *cst; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds if (nocst) 325d550d98dSPatrick Mochel return -ENODEV; 3261da177e4SLinus Torvalds 327991528d7SVenkatesh Pallipadi current_count = 0; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); 3301da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 3311da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); 332d550d98dSPatrick Mochel return -ENODEV; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 33550dd0969SJan Engelhardt cst = buffer.pointer; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds /* There must be at least 2 elements */ 3381da177e4SLinus Torvalds if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { 3396468463aSLen Brown printk(KERN_ERR PREFIX "not enough elements in _CST\n"); 3401da177e4SLinus Torvalds status = -EFAULT; 3411da177e4SLinus Torvalds goto end; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds count = cst->package.elements[0].integer.value; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* Validate number of power states. */ 3471da177e4SLinus Torvalds if (count < 1 || count != cst->package.count - 1) { 3486468463aSLen Brown printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); 3491da177e4SLinus Torvalds status = -EFAULT; 3501da177e4SLinus Torvalds goto end; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds /* Tell driver that at least _CST is supported. */ 3541da177e4SLinus Torvalds pr->flags.has_cst = 1; 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds for (i = 1; i <= count; i++) { 3571da177e4SLinus Torvalds union acpi_object *element; 3581da177e4SLinus Torvalds union acpi_object *obj; 3591da177e4SLinus Torvalds struct acpi_power_register *reg; 3601da177e4SLinus Torvalds struct acpi_processor_cx cx; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds memset(&cx, 0, sizeof(cx)); 3631da177e4SLinus Torvalds 36450dd0969SJan Engelhardt element = &(cst->package.elements[i]); 3651da177e4SLinus Torvalds if (element->type != ACPI_TYPE_PACKAGE) 3661da177e4SLinus Torvalds continue; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds if (element->package.count != 4) 3691da177e4SLinus Torvalds continue; 3701da177e4SLinus Torvalds 37150dd0969SJan Engelhardt obj = &(element->package.elements[0]); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_BUFFER) 3741da177e4SLinus Torvalds continue; 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds reg = (struct acpi_power_register *)obj->buffer.pointer; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && 3791da177e4SLinus Torvalds (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) 3801da177e4SLinus Torvalds continue; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* There should be an easy way to extract an integer... */ 38350dd0969SJan Engelhardt obj = &(element->package.elements[1]); 3841da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 3851da177e4SLinus Torvalds continue; 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds cx.type = obj->integer.value; 388991528d7SVenkatesh Pallipadi /* 389991528d7SVenkatesh Pallipadi * Some buggy BIOSes won't list C1 in _CST - 390991528d7SVenkatesh Pallipadi * Let acpi_processor_get_power_info_default() handle them later 391991528d7SVenkatesh Pallipadi */ 392991528d7SVenkatesh Pallipadi if (i == 1 && cx.type != ACPI_STATE_C1) 393991528d7SVenkatesh Pallipadi current_count++; 3941da177e4SLinus Torvalds 395991528d7SVenkatesh Pallipadi cx.address = reg->address; 396991528d7SVenkatesh Pallipadi cx.index = current_count + 1; 3971da177e4SLinus Torvalds 398bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_SYSTEMIO; 399991528d7SVenkatesh Pallipadi if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { 400991528d7SVenkatesh Pallipadi if (acpi_processor_ffh_cstate_probe 401991528d7SVenkatesh Pallipadi (pr->id, &cx, reg) == 0) { 402bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_FFH; 403bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx.type == ACPI_STATE_C1) { 404991528d7SVenkatesh Pallipadi /* 405991528d7SVenkatesh Pallipadi * C1 is a special case where FIXED_HARDWARE 406991528d7SVenkatesh Pallipadi * can be handled in non-MWAIT way as well. 407991528d7SVenkatesh Pallipadi * In that case, save this _CST entry info. 408991528d7SVenkatesh Pallipadi * Otherwise, ignore this info and continue. 409991528d7SVenkatesh Pallipadi */ 410bc71bec9Svenkatesh.pallipadi@intel.com cx.entry_method = ACPI_CSTATE_HALT; 4114fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 412bc71bec9Svenkatesh.pallipadi@intel.com } else { 4131da177e4SLinus Torvalds continue; 414991528d7SVenkatesh Pallipadi } 415da5e09a1SZhao Yakui if (cx.type == ACPI_STATE_C1 && 416da5e09a1SZhao Yakui (idle_halt || idle_nomwait)) { 417c1e3b377SZhao Yakui /* 418c1e3b377SZhao Yakui * In most cases the C1 space_id obtained from 419c1e3b377SZhao Yakui * _CST object is FIXED_HARDWARE access mode. 420c1e3b377SZhao Yakui * But when the option of idle=halt is added, 421c1e3b377SZhao Yakui * the entry_method type should be changed from 422c1e3b377SZhao Yakui * CSTATE_FFH to CSTATE_HALT. 423da5e09a1SZhao Yakui * When the option of idle=nomwait is added, 424da5e09a1SZhao Yakui * the C1 entry_method type should be 425da5e09a1SZhao Yakui * CSTATE_HALT. 426c1e3b377SZhao Yakui */ 427c1e3b377SZhao Yakui cx.entry_method = ACPI_CSTATE_HALT; 428c1e3b377SZhao Yakui snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); 429c1e3b377SZhao Yakui } 4304fcb2fcdSVenkatesh Pallipadi } else { 4314fcb2fcdSVenkatesh Pallipadi snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", 4324fcb2fcdSVenkatesh Pallipadi cx.address); 433991528d7SVenkatesh Pallipadi } 4341da177e4SLinus Torvalds 4350fda6b40SVenkatesh Pallipadi if (cx.type == ACPI_STATE_C1) { 4360fda6b40SVenkatesh Pallipadi cx.valid = 1; 4370fda6b40SVenkatesh Pallipadi } 4384fcb2fcdSVenkatesh Pallipadi 43950dd0969SJan Engelhardt obj = &(element->package.elements[2]); 4401da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4411da177e4SLinus Torvalds continue; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds cx.latency = obj->integer.value; 4441da177e4SLinus Torvalds 44550dd0969SJan Engelhardt obj = &(element->package.elements[3]); 4461da177e4SLinus Torvalds if (obj->type != ACPI_TYPE_INTEGER) 4471da177e4SLinus Torvalds continue; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds cx.power = obj->integer.value; 4501da177e4SLinus Torvalds 451cf824788SJanosch Machowinski current_count++; 452cf824788SJanosch Machowinski memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); 453cf824788SJanosch Machowinski 454cf824788SJanosch Machowinski /* 455cf824788SJanosch Machowinski * We support total ACPI_PROCESSOR_MAX_POWER - 1 456cf824788SJanosch Machowinski * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) 457cf824788SJanosch Machowinski */ 458cf824788SJanosch Machowinski if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { 459cf824788SJanosch Machowinski printk(KERN_WARNING 460cf824788SJanosch Machowinski "Limiting number of power states to max (%d)\n", 461cf824788SJanosch Machowinski ACPI_PROCESSOR_MAX_POWER); 462cf824788SJanosch Machowinski printk(KERN_WARNING 463cf824788SJanosch Machowinski "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); 464cf824788SJanosch Machowinski break; 465cf824788SJanosch Machowinski } 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4684be44fcdSLen Brown ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", 469cf824788SJanosch Machowinski current_count)); 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* Validate number of power states discovered */ 472cf824788SJanosch Machowinski if (current_count < 2) 4736d93c648SVenkatesh Pallipadi status = -EFAULT; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds end: 47602438d87SLen Brown kfree(buffer.pointer); 4771da177e4SLinus Torvalds 478d550d98dSPatrick Mochel return status; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx) 4821da177e4SLinus Torvalds { 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds if (!cx->address) 485d550d98dSPatrick Mochel return; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* 4881da177e4SLinus Torvalds * C2 latency must be less than or equal to 100 4891da177e4SLinus Torvalds * microseconds. 4901da177e4SLinus Torvalds */ 4911da177e4SLinus Torvalds else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { 4921da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 4934be44fcdSLen Brown "latency too large [%d]\n", cx->latency)); 494d550d98dSPatrick Mochel return; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds /* 4981da177e4SLinus Torvalds * Otherwise we've met all of our C2 requirements. 4991da177e4SLinus Torvalds * Normalize the C2 latency to expidite policy 5001da177e4SLinus Torvalds */ 5011da177e4SLinus Torvalds cx->valid = 1; 5024f86d3a8SLen Brown 5034f86d3a8SLen Brown cx->latency_ticks = cx->latency; 5041da177e4SLinus Torvalds 505d550d98dSPatrick Mochel return; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5084be44fcdSLen Brown static void acpi_processor_power_verify_c3(struct acpi_processor *pr, 5091da177e4SLinus Torvalds struct acpi_processor_cx *cx) 5101da177e4SLinus Torvalds { 51102df8b93SVenkatesh Pallipadi static int bm_check_flag; 51202df8b93SVenkatesh Pallipadi 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds if (!cx->address) 515d550d98dSPatrick Mochel return; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* 5181da177e4SLinus Torvalds * C3 latency must be less than or equal to 1000 5191da177e4SLinus Torvalds * microseconds. 5201da177e4SLinus Torvalds */ 5211da177e4SLinus Torvalds else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { 5221da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 5234be44fcdSLen Brown "latency too large [%d]\n", cx->latency)); 524d550d98dSPatrick Mochel return; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds /* 5281da177e4SLinus Torvalds * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) 5291da177e4SLinus Torvalds * DMA transfers are used by any ISA device to avoid livelock. 5301da177e4SLinus Torvalds * Note that we could disable Type-F DMA (as recommended by 5311da177e4SLinus Torvalds * the erratum), but this is known to disrupt certain ISA 5321da177e4SLinus Torvalds * devices thus we take the conservative approach. 5331da177e4SLinus Torvalds */ 5341da177e4SLinus Torvalds else if (errata.piix4.fdma) { 5351da177e4SLinus Torvalds ACPI_DEBUG_PRINT((ACPI_DB_INFO, 5361da177e4SLinus Torvalds "C3 not supported on PIIX4 with Type-F DMA\n")); 537d550d98dSPatrick Mochel return; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 54002df8b93SVenkatesh Pallipadi /* All the logic here assumes flags.bm_check is same across all CPUs */ 54102df8b93SVenkatesh Pallipadi if (!bm_check_flag) { 54202df8b93SVenkatesh Pallipadi /* Determine whether bm_check is needed based on CPU */ 54302df8b93SVenkatesh Pallipadi acpi_processor_power_init_bm_check(&(pr->flags), pr->id); 54402df8b93SVenkatesh Pallipadi bm_check_flag = pr->flags.bm_check; 54502df8b93SVenkatesh Pallipadi } else { 54602df8b93SVenkatesh Pallipadi pr->flags.bm_check = bm_check_flag; 54702df8b93SVenkatesh Pallipadi } 54802df8b93SVenkatesh Pallipadi 54902df8b93SVenkatesh Pallipadi if (pr->flags.bm_check) { 55002df8b93SVenkatesh Pallipadi if (!pr->flags.bm_control) { 551ed3110efSVenki Pallipadi if (pr->flags.has_cst != 1) { 552ed3110efSVenki Pallipadi /* bus mastering control is necessary */ 55302df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 554ed3110efSVenki Pallipadi "C3 support requires BM control\n")); 555ed3110efSVenki Pallipadi return; 556ed3110efSVenki Pallipadi } else { 557ed3110efSVenki Pallipadi /* Here we enter C3 without bus mastering */ 558ed3110efSVenki Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 559ed3110efSVenki Pallipadi "C3 support without BM control\n")); 560ed3110efSVenki Pallipadi } 56102df8b93SVenkatesh Pallipadi } 56202df8b93SVenkatesh Pallipadi } else { 56302df8b93SVenkatesh Pallipadi /* 56402df8b93SVenkatesh Pallipadi * WBINVD should be set in fadt, for C3 state to be 56502df8b93SVenkatesh Pallipadi * supported on when bm_check is not required. 56602df8b93SVenkatesh Pallipadi */ 567cee324b1SAlexey Starikovskiy if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { 56802df8b93SVenkatesh Pallipadi ACPI_DEBUG_PRINT((ACPI_DB_INFO, 56902df8b93SVenkatesh Pallipadi "Cache invalidation should work properly" 57002df8b93SVenkatesh Pallipadi " for C3 to be enabled on SMP systems\n")); 571d550d98dSPatrick Mochel return; 57202df8b93SVenkatesh Pallipadi } 57302df8b93SVenkatesh Pallipadi } 57402df8b93SVenkatesh Pallipadi 5751da177e4SLinus Torvalds /* 5761da177e4SLinus Torvalds * Otherwise we've met all of our C3 requirements. 5771da177e4SLinus Torvalds * Normalize the C3 latency to expidite policy. Enable 5781da177e4SLinus Torvalds * checking of bus mastering status (bm_check) so we can 5791da177e4SLinus Torvalds * use this in our C3 policy 5801da177e4SLinus Torvalds */ 5811da177e4SLinus Torvalds cx->valid = 1; 5824f86d3a8SLen Brown 5834f86d3a8SLen Brown cx->latency_ticks = cx->latency; 58431878dd8SLen Brown /* 58531878dd8SLen Brown * On older chipsets, BM_RLD needs to be set 58631878dd8SLen Brown * in order for Bus Master activity to wake the 58731878dd8SLen Brown * system from C3. Newer chipsets handle DMA 58831878dd8SLen Brown * during C3 automatically and BM_RLD is a NOP. 58931878dd8SLen Brown * In either case, the proper way to 59031878dd8SLen Brown * handle BM_RLD is to set it and leave it set. 59131878dd8SLen Brown */ 59250ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); 5931da177e4SLinus Torvalds 594d550d98dSPatrick Mochel return; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds static int acpi_processor_power_verify(struct acpi_processor *pr) 5981da177e4SLinus Torvalds { 5991da177e4SLinus Torvalds unsigned int i; 6001da177e4SLinus Torvalds unsigned int working = 0; 6016eb0a0fdSVenkatesh Pallipadi 602169a0abbSThomas Gleixner pr->power.timer_broadcast_on_state = INT_MAX; 6036eb0a0fdSVenkatesh Pallipadi 6041da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 6051da177e4SLinus Torvalds struct acpi_processor_cx *cx = &pr->power.states[i]; 6061da177e4SLinus Torvalds 607a71e4917SLen Brown #if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86) 608a71e4917SLen Brown /* TSC could halt in idle, so notify users */ 609a71e4917SLen Brown if (tsc_halts_in_c(cx->type)) 610a71e4917SLen Brown mark_tsc_unstable("TSC halts in idle");; 611a71e4917SLen Brown #endif 6121da177e4SLinus Torvalds switch (cx->type) { 6131da177e4SLinus Torvalds case ACPI_STATE_C1: 6141da177e4SLinus Torvalds cx->valid = 1; 6151da177e4SLinus Torvalds break; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds case ACPI_STATE_C2: 6181da177e4SLinus Torvalds acpi_processor_power_verify_c2(cx); 619296d93cdSLinus Torvalds if (cx->valid) 620169a0abbSThomas Gleixner acpi_timer_check_state(i, pr, cx); 6211da177e4SLinus Torvalds break; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds case ACPI_STATE_C3: 6241da177e4SLinus Torvalds acpi_processor_power_verify_c3(pr, cx); 625296d93cdSLinus Torvalds if (cx->valid) 626169a0abbSThomas Gleixner acpi_timer_check_state(i, pr, cx); 6271da177e4SLinus Torvalds break; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds if (cx->valid) 6311da177e4SLinus Torvalds working++; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 634169a0abbSThomas Gleixner acpi_propagate_timer_broadcast(pr); 635bd663347SAndi Kleen 6361da177e4SLinus Torvalds return (working); 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6394be44fcdSLen Brown static int acpi_processor_get_power_info(struct acpi_processor *pr) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds unsigned int i; 6421da177e4SLinus Torvalds int result; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* NOTE: the idle thread may not be running while calling 6461da177e4SLinus Torvalds * this function */ 6471da177e4SLinus Torvalds 648991528d7SVenkatesh Pallipadi /* Zero initialize all the C-states info. */ 649991528d7SVenkatesh Pallipadi memset(pr->power.states, 0, sizeof(pr->power.states)); 650991528d7SVenkatesh Pallipadi 6511da177e4SLinus Torvalds result = acpi_processor_get_power_info_cst(pr); 6526d93c648SVenkatesh Pallipadi if (result == -ENODEV) 653c5a114f1SDarrick J. Wong result = acpi_processor_get_power_info_fadt(pr); 6546d93c648SVenkatesh Pallipadi 655991528d7SVenkatesh Pallipadi if (result) 656991528d7SVenkatesh Pallipadi return result; 657991528d7SVenkatesh Pallipadi 658991528d7SVenkatesh Pallipadi acpi_processor_get_power_info_default(pr); 659991528d7SVenkatesh Pallipadi 660cf824788SJanosch Machowinski pr->power.count = acpi_processor_power_verify(pr); 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* 6631da177e4SLinus Torvalds * if one state of type C2 or C3 is available, mark this 6641da177e4SLinus Torvalds * CPU as being "idle manageable" 6651da177e4SLinus Torvalds */ 6661da177e4SLinus Torvalds for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { 667acf05f4bSVenkatesh Pallipadi if (pr->power.states[i].valid) { 6681da177e4SLinus Torvalds pr->power.count = i; 6692203d6edSLinus Torvalds if (pr->power.states[i].type >= ACPI_STATE_C2) 6701da177e4SLinus Torvalds pr->flags.power = 1; 6711da177e4SLinus Torvalds } 672acf05f4bSVenkatesh Pallipadi } 6731da177e4SLinus Torvalds 674d550d98dSPatrick Mochel return 0; 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) 6781da177e4SLinus Torvalds { 67950dd0969SJan Engelhardt struct acpi_processor *pr = seq->private; 6801da177e4SLinus Torvalds unsigned int i; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds if (!pr) 6841da177e4SLinus Torvalds goto end; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds seq_printf(seq, "active state: C%zd\n" 6871da177e4SLinus Torvalds "max_cstate: C%d\n" 6885c87579eSArjan van de Ven "maximum allowed latency: %d usec\n", 6891da177e4SLinus Torvalds pr->power.state ? pr->power.state - pr->power.states : 0, 69092614610SLen Brown max_cstate, pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)); 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds seq_puts(seq, "states:\n"); 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds for (i = 1; i <= pr->power.count; i++) { 6951da177e4SLinus Torvalds seq_printf(seq, " %cC%d: ", 6964be44fcdSLen Brown (&pr->power.states[i] == 6974be44fcdSLen Brown pr->power.state ? '*' : ' '), i); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds if (!pr->power.states[i].valid) { 7001da177e4SLinus Torvalds seq_puts(seq, "<not supported>\n"); 7011da177e4SLinus Torvalds continue; 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds switch (pr->power.states[i].type) { 7051da177e4SLinus Torvalds case ACPI_STATE_C1: 7061da177e4SLinus Torvalds seq_printf(seq, "type[C1] "); 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds case ACPI_STATE_C2: 7091da177e4SLinus Torvalds seq_printf(seq, "type[C2] "); 7101da177e4SLinus Torvalds break; 7111da177e4SLinus Torvalds case ACPI_STATE_C3: 7121da177e4SLinus Torvalds seq_printf(seq, "type[C3] "); 7131da177e4SLinus Torvalds break; 7141da177e4SLinus Torvalds default: 7151da177e4SLinus Torvalds seq_printf(seq, "type[--] "); 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds if (pr->power.states[i].promotion.state) 7201da177e4SLinus Torvalds seq_printf(seq, "promotion[C%zd] ", 7211da177e4SLinus Torvalds (pr->power.states[i].promotion.state - 7221da177e4SLinus Torvalds pr->power.states)); 7231da177e4SLinus Torvalds else 7241da177e4SLinus Torvalds seq_puts(seq, "promotion[--] "); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds if (pr->power.states[i].demotion.state) 7271da177e4SLinus Torvalds seq_printf(seq, "demotion[C%zd] ", 7281da177e4SLinus Torvalds (pr->power.states[i].demotion.state - 7291da177e4SLinus Torvalds pr->power.states)); 7301da177e4SLinus Torvalds else 7311da177e4SLinus Torvalds seq_puts(seq, "demotion[--] "); 7321da177e4SLinus Torvalds 733a3c6598fSDominik Brodowski seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n", 7341da177e4SLinus Torvalds pr->power.states[i].latency, 735a3c6598fSDominik Brodowski pr->power.states[i].usage, 736b0b7eaafSAlexey Starikovskiy (unsigned long long)pr->power.states[i].time); 7371da177e4SLinus Torvalds } 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds end: 740d550d98dSPatrick Mochel return 0; 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds static int acpi_processor_power_open_fs(struct inode *inode, struct file *file) 7441da177e4SLinus Torvalds { 7451da177e4SLinus Torvalds return single_open(file, acpi_processor_power_seq_show, 7461da177e4SLinus Torvalds PDE(inode)->data); 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 749d7508032SArjan van de Ven static const struct file_operations acpi_processor_power_fops = { 750cf7acfabSDenis V. Lunev .owner = THIS_MODULE, 7511da177e4SLinus Torvalds .open = acpi_processor_power_open_fs, 7521da177e4SLinus Torvalds .read = seq_read, 7531da177e4SLinus Torvalds .llseek = seq_lseek, 7541da177e4SLinus Torvalds .release = single_release, 7551da177e4SLinus Torvalds }; 7561da177e4SLinus Torvalds 7574f86d3a8SLen Brown 7584f86d3a8SLen Brown /** 7594f86d3a8SLen Brown * acpi_idle_bm_check - checks if bus master activity was detected 7604f86d3a8SLen Brown */ 7614f86d3a8SLen Brown static int acpi_idle_bm_check(void) 7624f86d3a8SLen Brown { 7634f86d3a8SLen Brown u32 bm_status = 0; 7644f86d3a8SLen Brown 76550ffba1bSBob Moore acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); 7664f86d3a8SLen Brown if (bm_status) 76750ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); 7684f86d3a8SLen Brown /* 7694f86d3a8SLen Brown * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect 7704f86d3a8SLen Brown * the true state of bus mastering activity; forcing us to 7714f86d3a8SLen Brown * manually check the BMIDEA bit of each IDE channel. 7724f86d3a8SLen Brown */ 7734f86d3a8SLen Brown else if (errata.piix4.bmisx) { 7744f86d3a8SLen Brown if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) 7754f86d3a8SLen Brown || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) 7764f86d3a8SLen Brown bm_status = 1; 7774f86d3a8SLen Brown } 7784f86d3a8SLen Brown return bm_status; 7794f86d3a8SLen Brown } 7804f86d3a8SLen Brown 7814f86d3a8SLen Brown /** 7824f86d3a8SLen Brown * acpi_idle_do_entry - a helper function that does C2 and C3 type entry 7834f86d3a8SLen Brown * @cx: cstate data 784bc71bec9Svenkatesh.pallipadi@intel.com * 785bc71bec9Svenkatesh.pallipadi@intel.com * Caller disables interrupt before call and enables interrupt after return. 7864f86d3a8SLen Brown */ 7874f86d3a8SLen Brown static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) 7884f86d3a8SLen Brown { 789dcf30997SSteven Rostedt /* Don't trace irqs off for idle */ 790dcf30997SSteven Rostedt stop_critical_timings(); 791bc71bec9Svenkatesh.pallipadi@intel.com if (cx->entry_method == ACPI_CSTATE_FFH) { 7924f86d3a8SLen Brown /* Call into architectural FFH based C-state */ 7934f86d3a8SLen Brown acpi_processor_ffh_cstate_enter(cx); 794bc71bec9Svenkatesh.pallipadi@intel.com } else if (cx->entry_method == ACPI_CSTATE_HALT) { 795bc71bec9Svenkatesh.pallipadi@intel.com acpi_safe_halt(); 7964f86d3a8SLen Brown } else { 7974f86d3a8SLen Brown int unused; 7984f86d3a8SLen Brown /* IO port based C-state */ 7994f86d3a8SLen Brown inb(cx->address); 8004f86d3a8SLen Brown /* Dummy wait op - must do something useless after P_LVL2 read 8014f86d3a8SLen Brown because chipsets cannot guarantee that STPCLK# signal 8024f86d3a8SLen Brown gets asserted in time to freeze execution properly. */ 8034f86d3a8SLen Brown unused = inl(acpi_gbl_FADT.xpm_timer_block.address); 8044f86d3a8SLen Brown } 805dcf30997SSteven Rostedt start_critical_timings(); 8064f86d3a8SLen Brown } 8074f86d3a8SLen Brown 8084f86d3a8SLen Brown /** 8094f86d3a8SLen Brown * acpi_idle_enter_c1 - enters an ACPI C1 state-type 8104f86d3a8SLen Brown * @dev: the target CPU 8114f86d3a8SLen Brown * @state: the state data 8124f86d3a8SLen Brown * 8134f86d3a8SLen Brown * This is equivalent to the HALT instruction. 8144f86d3a8SLen Brown */ 8154f86d3a8SLen Brown static int acpi_idle_enter_c1(struct cpuidle_device *dev, 8164f86d3a8SLen Brown struct cpuidle_state *state) 8174f86d3a8SLen Brown { 818ff69f2bbSalex.shi ktime_t kt1, kt2; 819ff69f2bbSalex.shi s64 idle_time; 8204f86d3a8SLen Brown struct acpi_processor *pr; 8214f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 8229b12e18cSvenkatesh.pallipadi@intel.com 823706546d0SMike Travis pr = __get_cpu_var(processors); 8244f86d3a8SLen Brown 8254f86d3a8SLen Brown if (unlikely(!pr)) 8264f86d3a8SLen Brown return 0; 8274f86d3a8SLen Brown 8282e906655Svenkatesh.pallipadi@intel.com local_irq_disable(); 829b077fbadSVenkatesh Pallipadi 830b077fbadSVenkatesh Pallipadi /* Do not access any ACPI IO ports in suspend path */ 831b077fbadSVenkatesh Pallipadi if (acpi_idle_suspend) { 832b077fbadSVenkatesh Pallipadi acpi_safe_halt(); 833b077fbadSVenkatesh Pallipadi local_irq_enable(); 834b077fbadSVenkatesh Pallipadi return 0; 835b077fbadSVenkatesh Pallipadi } 836b077fbadSVenkatesh Pallipadi 837ff69f2bbSalex.shi kt1 = ktime_get_real(); 838bc71bec9Svenkatesh.pallipadi@intel.com acpi_idle_do_entry(cx); 839ff69f2bbSalex.shi kt2 = ktime_get_real(); 840ff69f2bbSalex.shi idle_time = ktime_to_us(ktime_sub(kt2, kt1)); 8414f86d3a8SLen Brown 8422e906655Svenkatesh.pallipadi@intel.com local_irq_enable(); 8434f86d3a8SLen Brown cx->usage++; 8444f86d3a8SLen Brown 845ff69f2bbSalex.shi return idle_time; 8464f86d3a8SLen Brown } 8474f86d3a8SLen Brown 8484f86d3a8SLen Brown /** 8494f86d3a8SLen Brown * acpi_idle_enter_simple - enters an ACPI state without BM handling 8504f86d3a8SLen Brown * @dev: the target CPU 8514f86d3a8SLen Brown * @state: the state data 8524f86d3a8SLen Brown */ 8534f86d3a8SLen Brown static int acpi_idle_enter_simple(struct cpuidle_device *dev, 8544f86d3a8SLen Brown struct cpuidle_state *state) 8554f86d3a8SLen Brown { 8564f86d3a8SLen Brown struct acpi_processor *pr; 8574f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 858ff69f2bbSalex.shi ktime_t kt1, kt2; 859ff69f2bbSalex.shi s64 idle_time; 860ff69f2bbSalex.shi s64 sleep_ticks = 0; 86150629118SVenkatesh Pallipadi 862706546d0SMike Travis pr = __get_cpu_var(processors); 8634f86d3a8SLen Brown 8644f86d3a8SLen Brown if (unlikely(!pr)) 8654f86d3a8SLen Brown return 0; 8664f86d3a8SLen Brown 867e196441bSLen Brown if (acpi_idle_suspend) 868e196441bSLen Brown return(acpi_idle_enter_c1(dev, state)); 869e196441bSLen Brown 8704f86d3a8SLen Brown local_irq_disable(); 8714f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 8724f86d3a8SLen Brown /* 8734f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 8744f86d3a8SLen Brown * NEED_RESCHED: 8754f86d3a8SLen Brown */ 8764f86d3a8SLen Brown smp_mb(); 8774f86d3a8SLen Brown 8784f86d3a8SLen Brown if (unlikely(need_resched())) { 8794f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 8804f86d3a8SLen Brown local_irq_enable(); 8814f86d3a8SLen Brown return 0; 8824f86d3a8SLen Brown } 8834f86d3a8SLen Brown 884e17bcb43SThomas Gleixner /* 885e17bcb43SThomas Gleixner * Must be done before busmaster disable as we might need to 886e17bcb43SThomas Gleixner * access HPET ! 887e17bcb43SThomas Gleixner */ 888e17bcb43SThomas Gleixner acpi_state_timer_broadcast(pr, cx, 1); 889e17bcb43SThomas Gleixner 8904f86d3a8SLen Brown if (cx->type == ACPI_STATE_C3) 8914f86d3a8SLen Brown ACPI_FLUSH_CPU_CACHE(); 8924f86d3a8SLen Brown 893ff69f2bbSalex.shi kt1 = ktime_get_real(); 89450629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 89550629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 8964f86d3a8SLen Brown acpi_idle_do_entry(cx); 897ff69f2bbSalex.shi kt2 = ktime_get_real(); 898ff69f2bbSalex.shi idle_time = ktime_to_us(ktime_sub(kt2, kt1)); 8994f86d3a8SLen Brown 900ff69f2bbSalex.shi sleep_ticks = us_to_pm_timer_ticks(idle_time); 90150629118SVenkatesh Pallipadi 90250629118SVenkatesh Pallipadi /* Tell the scheduler how much we idled: */ 90350629118SVenkatesh Pallipadi sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); 9044f86d3a8SLen Brown 9054f86d3a8SLen Brown local_irq_enable(); 9064f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 9074f86d3a8SLen Brown 9084f86d3a8SLen Brown cx->usage++; 9094f86d3a8SLen Brown 9104f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 0); 91150629118SVenkatesh Pallipadi cx->time += sleep_ticks; 912ff69f2bbSalex.shi return idle_time; 9134f86d3a8SLen Brown } 9144f86d3a8SLen Brown 9154f86d3a8SLen Brown static int c3_cpu_count; 9164f86d3a8SLen Brown static DEFINE_SPINLOCK(c3_lock); 9174f86d3a8SLen Brown 9184f86d3a8SLen Brown /** 9194f86d3a8SLen Brown * acpi_idle_enter_bm - enters C3 with proper BM handling 9204f86d3a8SLen Brown * @dev: the target CPU 9214f86d3a8SLen Brown * @state: the state data 9224f86d3a8SLen Brown * 9234f86d3a8SLen Brown * If BM is detected, the deepest non-C3 idle state is entered instead. 9244f86d3a8SLen Brown */ 9254f86d3a8SLen Brown static int acpi_idle_enter_bm(struct cpuidle_device *dev, 9264f86d3a8SLen Brown struct cpuidle_state *state) 9274f86d3a8SLen Brown { 9284f86d3a8SLen Brown struct acpi_processor *pr; 9294f86d3a8SLen Brown struct acpi_processor_cx *cx = cpuidle_get_statedata(state); 930ff69f2bbSalex.shi ktime_t kt1, kt2; 931ff69f2bbSalex.shi s64 idle_time; 932ff69f2bbSalex.shi s64 sleep_ticks = 0; 933ff69f2bbSalex.shi 93450629118SVenkatesh Pallipadi 935706546d0SMike Travis pr = __get_cpu_var(processors); 9364f86d3a8SLen Brown 9374f86d3a8SLen Brown if (unlikely(!pr)) 9384f86d3a8SLen Brown return 0; 9394f86d3a8SLen Brown 940e196441bSLen Brown if (acpi_idle_suspend) 941e196441bSLen Brown return(acpi_idle_enter_c1(dev, state)); 942e196441bSLen Brown 943ddc081a1SVenkatesh Pallipadi if (acpi_idle_bm_check()) { 944ddc081a1SVenkatesh Pallipadi if (dev->safe_state) { 945addbad46SVenkatesh Pallipadi dev->last_state = dev->safe_state; 946ddc081a1SVenkatesh Pallipadi return dev->safe_state->enter(dev, dev->safe_state); 947ddc081a1SVenkatesh Pallipadi } else { 9482e906655Svenkatesh.pallipadi@intel.com local_irq_disable(); 949ddc081a1SVenkatesh Pallipadi acpi_safe_halt(); 9502e906655Svenkatesh.pallipadi@intel.com local_irq_enable(); 951ddc081a1SVenkatesh Pallipadi return 0; 952ddc081a1SVenkatesh Pallipadi } 953ddc081a1SVenkatesh Pallipadi } 954ddc081a1SVenkatesh Pallipadi 9554f86d3a8SLen Brown local_irq_disable(); 9564f86d3a8SLen Brown current_thread_info()->status &= ~TS_POLLING; 9574f86d3a8SLen Brown /* 9584f86d3a8SLen Brown * TS_POLLING-cleared state must be visible before we test 9594f86d3a8SLen Brown * NEED_RESCHED: 9604f86d3a8SLen Brown */ 9614f86d3a8SLen Brown smp_mb(); 9624f86d3a8SLen Brown 9634f86d3a8SLen Brown if (unlikely(need_resched())) { 9644f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 9654f86d3a8SLen Brown local_irq_enable(); 9664f86d3a8SLen Brown return 0; 9674f86d3a8SLen Brown } 9684f86d3a8SLen Brown 969996520c1SVenki Pallipadi acpi_unlazy_tlb(smp_processor_id()); 970996520c1SVenki Pallipadi 97150629118SVenkatesh Pallipadi /* Tell the scheduler that we are going deep-idle: */ 97250629118SVenkatesh Pallipadi sched_clock_idle_sleep_event(); 9734f86d3a8SLen Brown /* 9744f86d3a8SLen Brown * Must be done before busmaster disable as we might need to 9754f86d3a8SLen Brown * access HPET ! 9764f86d3a8SLen Brown */ 9774f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 1); 9784f86d3a8SLen Brown 979f461ddeaSLen Brown kt1 = ktime_get_real(); 980c9c860e5SVenkatesh Pallipadi /* 981c9c860e5SVenkatesh Pallipadi * disable bus master 982c9c860e5SVenkatesh Pallipadi * bm_check implies we need ARB_DIS 983c9c860e5SVenkatesh Pallipadi * !bm_check implies we need cache flush 984c9c860e5SVenkatesh Pallipadi * bm_control implies whether we can do ARB_DIS 985c9c860e5SVenkatesh Pallipadi * 986c9c860e5SVenkatesh Pallipadi * That leaves a case where bm_check is set and bm_control is 987c9c860e5SVenkatesh Pallipadi * not set. In that case we cannot do much, we enter C3 988c9c860e5SVenkatesh Pallipadi * without doing anything. 989c9c860e5SVenkatesh Pallipadi */ 990c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 9914f86d3a8SLen Brown spin_lock(&c3_lock); 9924f86d3a8SLen Brown c3_cpu_count++; 9934f86d3a8SLen Brown /* Disable bus master arbitration when all CPUs are in C3 */ 9944f86d3a8SLen Brown if (c3_cpu_count == num_online_cpus()) 99550ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); 9964f86d3a8SLen Brown spin_unlock(&c3_lock); 997c9c860e5SVenkatesh Pallipadi } else if (!pr->flags.bm_check) { 998c9c860e5SVenkatesh Pallipadi ACPI_FLUSH_CPU_CACHE(); 999c9c860e5SVenkatesh Pallipadi } 10004f86d3a8SLen Brown 10014f86d3a8SLen Brown acpi_idle_do_entry(cx); 10024f86d3a8SLen Brown 10034f86d3a8SLen Brown /* Re-enable bus master arbitration */ 1004c9c860e5SVenkatesh Pallipadi if (pr->flags.bm_check && pr->flags.bm_control) { 1005c9c860e5SVenkatesh Pallipadi spin_lock(&c3_lock); 100650ffba1bSBob Moore acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); 10074f86d3a8SLen Brown c3_cpu_count--; 10084f86d3a8SLen Brown spin_unlock(&c3_lock); 10094f86d3a8SLen Brown } 1010f461ddeaSLen Brown kt2 = ktime_get_real(); 1011f461ddeaSLen Brown idle_time = ktime_to_us(ktime_sub(kt2, kt1)); 10124f86d3a8SLen Brown 1013ff69f2bbSalex.shi sleep_ticks = us_to_pm_timer_ticks(idle_time); 101450629118SVenkatesh Pallipadi /* Tell the scheduler how much we idled: */ 101550629118SVenkatesh Pallipadi sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS); 10164f86d3a8SLen Brown 10174f86d3a8SLen Brown local_irq_enable(); 10184f86d3a8SLen Brown current_thread_info()->status |= TS_POLLING; 10194f86d3a8SLen Brown 10204f86d3a8SLen Brown cx->usage++; 10214f86d3a8SLen Brown 10224f86d3a8SLen Brown acpi_state_timer_broadcast(pr, cx, 0); 102350629118SVenkatesh Pallipadi cx->time += sleep_ticks; 1024ff69f2bbSalex.shi return idle_time; 10254f86d3a8SLen Brown } 10264f86d3a8SLen Brown 10274f86d3a8SLen Brown struct cpuidle_driver acpi_idle_driver = { 10284f86d3a8SLen Brown .name = "acpi_idle", 10294f86d3a8SLen Brown .owner = THIS_MODULE, 10304f86d3a8SLen Brown }; 10314f86d3a8SLen Brown 10324f86d3a8SLen Brown /** 10334f86d3a8SLen Brown * acpi_processor_setup_cpuidle - prepares and configures CPUIDLE 10344f86d3a8SLen Brown * @pr: the ACPI processor 10354f86d3a8SLen Brown */ 10364f86d3a8SLen Brown static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) 10374f86d3a8SLen Brown { 10389a0b8415Svenkatesh.pallipadi@intel.com int i, count = CPUIDLE_DRIVER_STATE_START; 10394f86d3a8SLen Brown struct acpi_processor_cx *cx; 10404f86d3a8SLen Brown struct cpuidle_state *state; 10414f86d3a8SLen Brown struct cpuidle_device *dev = &pr->power.dev; 10424f86d3a8SLen Brown 10434f86d3a8SLen Brown if (!pr->flags.power_setup_done) 10444f86d3a8SLen Brown return -EINVAL; 10454f86d3a8SLen Brown 10464f86d3a8SLen Brown if (pr->flags.power == 0) { 10474f86d3a8SLen Brown return -EINVAL; 10484f86d3a8SLen Brown } 10494f86d3a8SLen Brown 1050dcb84f33SVenkatesh Pallipadi dev->cpu = pr->id; 10514fcb2fcdSVenkatesh Pallipadi for (i = 0; i < CPUIDLE_STATE_MAX; i++) { 10524fcb2fcdSVenkatesh Pallipadi dev->states[i].name[0] = '\0'; 10534fcb2fcdSVenkatesh Pallipadi dev->states[i].desc[0] = '\0'; 10544fcb2fcdSVenkatesh Pallipadi } 10554fcb2fcdSVenkatesh Pallipadi 1056615dfd93SLen Brown if (max_cstate == 0) 1057615dfd93SLen Brown max_cstate = 1; 1058615dfd93SLen Brown 10594f86d3a8SLen Brown for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { 10604f86d3a8SLen Brown cx = &pr->power.states[i]; 10614f86d3a8SLen Brown state = &dev->states[count]; 10624f86d3a8SLen Brown 10634f86d3a8SLen Brown if (!cx->valid) 10644f86d3a8SLen Brown continue; 10654f86d3a8SLen Brown 10664f86d3a8SLen Brown #ifdef CONFIG_HOTPLUG_CPU 10674f86d3a8SLen Brown if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 10684f86d3a8SLen Brown !pr->flags.has_cst && 10694f86d3a8SLen Brown !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) 10704f86d3a8SLen Brown continue; 10714f86d3a8SLen Brown #endif 10724f86d3a8SLen Brown cpuidle_set_statedata(state, cx); 10734f86d3a8SLen Brown 10744f86d3a8SLen Brown snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); 10754fcb2fcdSVenkatesh Pallipadi strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); 10764f86d3a8SLen Brown state->exit_latency = cx->latency; 10774963f620SLen Brown state->target_residency = cx->latency * latency_factor; 10784f86d3a8SLen Brown state->power_usage = cx->power; 10794f86d3a8SLen Brown 10804f86d3a8SLen Brown state->flags = 0; 10814f86d3a8SLen Brown switch (cx->type) { 10824f86d3a8SLen Brown case ACPI_STATE_C1: 10834f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_SHALLOW; 10848e92b660SVenki Pallipadi if (cx->entry_method == ACPI_CSTATE_FFH) 10859b12e18cSvenkatesh.pallipadi@intel.com state->flags |= CPUIDLE_FLAG_TIME_VALID; 10868e92b660SVenki Pallipadi 10874f86d3a8SLen Brown state->enter = acpi_idle_enter_c1; 1088ddc081a1SVenkatesh Pallipadi dev->safe_state = state; 10894f86d3a8SLen Brown break; 10904f86d3a8SLen Brown 10914f86d3a8SLen Brown case ACPI_STATE_C2: 10924f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_BALANCED; 10934f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 10944f86d3a8SLen Brown state->enter = acpi_idle_enter_simple; 1095ddc081a1SVenkatesh Pallipadi dev->safe_state = state; 10964f86d3a8SLen Brown break; 10974f86d3a8SLen Brown 10984f86d3a8SLen Brown case ACPI_STATE_C3: 10994f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_DEEP; 11004f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_TIME_VALID; 11014f86d3a8SLen Brown state->flags |= CPUIDLE_FLAG_CHECK_BM; 11024f86d3a8SLen Brown state->enter = pr->flags.bm_check ? 11034f86d3a8SLen Brown acpi_idle_enter_bm : 11044f86d3a8SLen Brown acpi_idle_enter_simple; 11054f86d3a8SLen Brown break; 11064f86d3a8SLen Brown } 11074f86d3a8SLen Brown 11084f86d3a8SLen Brown count++; 11099a0b8415Svenkatesh.pallipadi@intel.com if (count == CPUIDLE_STATE_MAX) 11109a0b8415Svenkatesh.pallipadi@intel.com break; 11114f86d3a8SLen Brown } 11124f86d3a8SLen Brown 11134f86d3a8SLen Brown dev->state_count = count; 11144f86d3a8SLen Brown 11154f86d3a8SLen Brown if (!count) 11164f86d3a8SLen Brown return -EINVAL; 11174f86d3a8SLen Brown 11184f86d3a8SLen Brown return 0; 11194f86d3a8SLen Brown } 11204f86d3a8SLen Brown 11214f86d3a8SLen Brown int acpi_processor_cst_has_changed(struct acpi_processor *pr) 11224f86d3a8SLen Brown { 1123dcb84f33SVenkatesh Pallipadi int ret = 0; 11244f86d3a8SLen Brown 112536a91358SVenkatesh Pallipadi if (boot_option_idle_override) 112636a91358SVenkatesh Pallipadi return 0; 112736a91358SVenkatesh Pallipadi 11284f86d3a8SLen Brown if (!pr) 11294f86d3a8SLen Brown return -EINVAL; 11304f86d3a8SLen Brown 11314f86d3a8SLen Brown if (nocst) { 11324f86d3a8SLen Brown return -ENODEV; 11334f86d3a8SLen Brown } 11344f86d3a8SLen Brown 11354f86d3a8SLen Brown if (!pr->flags.power_setup_done) 11364f86d3a8SLen Brown return -ENODEV; 11374f86d3a8SLen Brown 11384f86d3a8SLen Brown cpuidle_pause_and_lock(); 11394f86d3a8SLen Brown cpuidle_disable_device(&pr->power.dev); 11404f86d3a8SLen Brown acpi_processor_get_power_info(pr); 1141dcb84f33SVenkatesh Pallipadi if (pr->flags.power) { 11424f86d3a8SLen Brown acpi_processor_setup_cpuidle(pr); 11434f86d3a8SLen Brown ret = cpuidle_enable_device(&pr->power.dev); 1144dcb84f33SVenkatesh Pallipadi } 11454f86d3a8SLen Brown cpuidle_resume_and_unlock(); 11464f86d3a8SLen Brown 11474f86d3a8SLen Brown return ret; 11484f86d3a8SLen Brown } 11494f86d3a8SLen Brown 11507af8b660SPierre Ossman int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, 11514be44fcdSLen Brown struct acpi_device *device) 11521da177e4SLinus Torvalds { 11531da177e4SLinus Torvalds acpi_status status = 0; 1154b6835052SAndreas Mohr static int first_run; 11551da177e4SLinus Torvalds struct proc_dir_entry *entry = NULL; 11561da177e4SLinus Torvalds unsigned int i; 11571da177e4SLinus Torvalds 115836a91358SVenkatesh Pallipadi if (boot_option_idle_override) 115936a91358SVenkatesh Pallipadi return 0; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds if (!first_run) { 1162c1e3b377SZhao Yakui if (idle_halt) { 1163c1e3b377SZhao Yakui /* 1164c1e3b377SZhao Yakui * When the boot option of "idle=halt" is added, halt 1165c1e3b377SZhao Yakui * is used for CPU IDLE. 1166c1e3b377SZhao Yakui * In such case C2/C3 is meaningless. So the max_cstate 1167c1e3b377SZhao Yakui * is set to one. 1168c1e3b377SZhao Yakui */ 1169c1e3b377SZhao Yakui max_cstate = 1; 1170c1e3b377SZhao Yakui } 11711da177e4SLinus Torvalds dmi_check_system(processor_power_dmi_table); 1172c1c30634SAlexey Starikovskiy max_cstate = acpi_processor_cstate_check(max_cstate); 11731da177e4SLinus Torvalds if (max_cstate < ACPI_C_STATES_MAX) 11744be44fcdSLen Brown printk(KERN_NOTICE 11754be44fcdSLen Brown "ACPI: processor limited to max C-state %d\n", 11764be44fcdSLen Brown max_cstate); 11771da177e4SLinus Torvalds first_run++; 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds 118002df8b93SVenkatesh Pallipadi if (!pr) 1181d550d98dSPatrick Mochel return -EINVAL; 118202df8b93SVenkatesh Pallipadi 1183cee324b1SAlexey Starikovskiy if (acpi_gbl_FADT.cst_control && !nocst) { 11844be44fcdSLen Brown status = 1185cee324b1SAlexey Starikovskiy acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); 11861da177e4SLinus Torvalds if (ACPI_FAILURE(status)) { 1187a6fc6720SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, 1188a6fc6720SThomas Renninger "Notifying BIOS of _CST ability failed")); 11891da177e4SLinus Torvalds } 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds acpi_processor_get_power_info(pr); 11934f86d3a8SLen Brown pr->flags.power_setup_done = 1; 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds /* 11961da177e4SLinus Torvalds * Install the idle handler if processor power management is supported. 11971da177e4SLinus Torvalds * Note that we use previously set idle handler will be used on 11981da177e4SLinus Torvalds * platforms that only support C1. 11991da177e4SLinus Torvalds */ 120036a91358SVenkatesh Pallipadi if (pr->flags.power) { 12014f86d3a8SLen Brown acpi_processor_setup_cpuidle(pr); 12024f86d3a8SLen Brown if (cpuidle_register_device(&pr->power.dev)) 12034f86d3a8SLen Brown return -EIO; 12044f86d3a8SLen Brown 12051da177e4SLinus Torvalds printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); 12061da177e4SLinus Torvalds for (i = 1; i <= pr->power.count; i++) 12071da177e4SLinus Torvalds if (pr->power.states[i].valid) 12084be44fcdSLen Brown printk(" C%d[C%d]", i, 12094be44fcdSLen Brown pr->power.states[i].type); 12101da177e4SLinus Torvalds printk(")\n"); 12111da177e4SLinus Torvalds } 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds /* 'power' [R] */ 1214cf7acfabSDenis V. Lunev entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER, 1215cf7acfabSDenis V. Lunev S_IRUGO, acpi_device_dir(device), 1216cf7acfabSDenis V. Lunev &acpi_processor_power_fops, 1217cf7acfabSDenis V. Lunev acpi_driver_data(device)); 12181da177e4SLinus Torvalds if (!entry) 1219a6fc6720SThomas Renninger return -EIO; 1220d550d98dSPatrick Mochel return 0; 12211da177e4SLinus Torvalds } 12221da177e4SLinus Torvalds 12234be44fcdSLen Brown int acpi_processor_power_exit(struct acpi_processor *pr, 12244be44fcdSLen Brown struct acpi_device *device) 12251da177e4SLinus Torvalds { 122636a91358SVenkatesh Pallipadi if (boot_option_idle_override) 122736a91358SVenkatesh Pallipadi return 0; 122836a91358SVenkatesh Pallipadi 12294f86d3a8SLen Brown cpuidle_unregister_device(&pr->power.dev); 12301da177e4SLinus Torvalds pr->flags.power_setup_done = 0; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds if (acpi_device_dir(device)) 12334be44fcdSLen Brown remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, 12344be44fcdSLen Brown acpi_device_dir(device)); 12351da177e4SLinus Torvalds 1236d550d98dSPatrick Mochel return 0; 12371da177e4SLinus Torvalds } 1238