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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * processor_idle - idle state submodule to the ACPI processor driver
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
Dominik Brodowskic5ab81c2006-06-24 19:37:00 -04006 * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -04009 * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
10 * - Added support for C3 on SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
Sudeep Hollab6ec26f2015-12-02 14:10:44 +000026#define pr_fmt(fmt) "ACPI: " fmt
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/acpi.h>
30#include <linux/dmi.h>
Daniel Lezcanoe2668fb2013-02-04 22:44:41 +000031#include <linux/sched.h> /* need_resched() */
Thomas Gleixneree41eeb2015-04-03 02:02:00 +020032#include <linux/tick.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040033#include <linux/cpuidle.h>
Chris Metcalf6727ad92016-10-07 17:02:55 -070034#include <linux/cpu.h>
Lv Zheng8b484632013-12-03 08:49:16 +080035#include <acpi/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Thomas Gleixner34349332007-02-16 01:27:54 -080037/*
38 * Include the apic definitions for x86 to have the APIC timer related defines
39 * available also for UP (on SMP it gets magically included via linux/smp.h).
40 * asm/acpi.h is not an option, as it would require more include magic. Also
41 * creating an empty asm-ia64/apic.h would just trade pest vs. cholera.
42 */
43#ifdef CONFIG_X86
44#include <asm/apic.h>
45#endif
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050049ACPI_MODULE_NAME("processor_idle");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Rafael J. Wysockidc2251b2017-08-23 23:19:57 +020051#define ACPI_IDLE_STATE_START (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0)
52
Len Brown4f86d3a2007-10-03 18:58:00 -040053static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
54module_param(max_cstate, uint, 0000);
Andreas Mohrb6835052006-04-27 05:25:00 -040055static unsigned int nocst __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056module_param(nocst, uint, 0000);
Len Brownd3e7e992010-07-22 17:23:10 -040057static int bm_check_disable __read_mostly;
58module_param(bm_check_disable, uint, 0000);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Len Brown25de5712007-12-14 00:24:15 -050060static unsigned int latency_factor __read_mostly = 2;
Len Brown4963f622007-12-13 23:50:45 -050061module_param(latency_factor, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Daniel Lezcano3d339dc2012-09-17 23:01:56 +020063static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
64
Sudeep Holla35ae7132016-07-19 18:52:53 +010065struct cpuidle_driver acpi_idle_driver = {
66 .name = "acpi_idle",
67 .owner = THIS_MODULE,
68};
69
70#ifdef CONFIG_ACPI_PROCESSOR_CSTATE
Peter Zijlstra25528212016-03-15 14:52:49 -070071static
72DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], acpi_cstate);
Daniel Lezcanoac3ebaf2013-02-04 22:44:43 +000073
Thomas Renningerd1896042010-11-03 17:06:14 +010074static int disabled_by_idle_boot_param(void)
75{
76 return boot_option_idle_override == IDLE_POLL ||
Thomas Renningerd1896042010-11-03 17:06:14 +010077 boot_option_idle_override == IDLE_HALT;
78}
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080/*
81 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
82 * For now disable this. Probably a bug somewhere else.
83 *
84 * To skip this limit, boot/load with a large max_cstate limit.
85 */
Jeff Garzik18552562007-10-03 15:15:40 -040086static int set_max_cstate(const struct dmi_system_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
88 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
89 return 0;
90
Sudeep Hollab6ec26f2015-12-02 14:10:44 +000091 pr_notice("%s detected - limiting to C%ld max_cstate."
92 " Override with \"processor.max_cstate=%d\"\n", id->ident,
93 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Len Brown3d356002005-08-03 00:22:52 -040095 max_cstate = (long)id->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 return 0;
98}
99
Mathias Krauseb0346682015-06-13 14:26:57 +0200100static const struct dmi_system_id processor_power_dmi_table[] = {
Thomas Rosner876c1842006-01-06 01:31:00 -0500101 { set_max_cstate, "Clevo 5600D", {
102 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
103 DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
Len Brown4be44fc2005-08-05 00:44:28 -0400104 (void *)2},
Arjan van de Ven370d5cd2010-01-27 15:25:39 -0800105 { set_max_cstate, "Pavilion zv5000", {
106 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
107 DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")},
108 (void *)1},
109 { set_max_cstate, "Asus L8400B", {
110 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
111 DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
112 (void *)1},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 {},
114};
115
Len Brown4f86d3a2007-10-03 18:58:00 -0400116
venkatesh.pallipadi@intel.com2e906652008-01-31 17:35:03 -0800117/*
118 * Callers should disable interrupts before the call and enable
119 * interrupts after return.
120 */
Chris Metcalf6727ad92016-10-07 17:02:55 -0700121static void __cpuidle acpi_safe_halt(void)
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500122{
Peter Zijlstraea811742013-09-11 12:43:13 +0200123 if (!tif_need_resched()) {
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500124 safe_halt();
Venki Pallipadi71e93d12008-03-13 17:18:19 -0700125 local_irq_disable();
126 }
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500127}
128
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800129#ifdef ARCH_APICTIMER_STOPS_ON_C3
130
131/*
132 * Some BIOS implementations switch to C3 in the published C2 state.
Linus Torvalds296d93c2007-03-23 08:03:47 -0700133 * This seems to be a common problem on AMD boxen, but other vendors
134 * are affected too. We pick the most conservative approach: we assume
135 * that the local APIC stops in both C2 and C3.
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800136 */
Len Brown7e275cc2009-05-15 02:08:44 -0400137static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800138 struct acpi_processor_cx *cx)
139{
140 struct acpi_processor_power *pwr = &pr->power;
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100141 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800142
Venkatesh Pallipadidb954b52009-04-06 18:51:29 -0700143 if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
144 return;
145
Borislav Petkov07c94a32016-12-09 19:29:11 +0100146 if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E))
Shaohua Li87ad57ba2009-05-19 16:09:42 +0800147 type = ACPI_STATE_C1;
148
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800149 /*
150 * Check, if one of the previous states already marked the lapic
151 * unstable
152 */
153 if (pwr->timer_broadcast_on_state < state)
154 return;
155
Thomas Gleixnere585bef2007-03-23 16:08:01 +0100156 if (cx->type >= type)
Linus Torvalds296d93c2007-03-23 08:03:47 -0700157 pr->power.timer_broadcast_on_state = state;
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800158}
159
Hidetoshi Seto918aae42009-12-14 17:10:06 +0900160static void __lapic_timer_propagate_broadcast(void *arg)
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800161{
Suresh Siddhaf833bab2009-08-17 14:34:59 -0700162 struct acpi_processor *pr = (struct acpi_processor *) arg;
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800163
Thomas Gleixneree41eeb2015-04-03 02:02:00 +0200164 if (pr->power.timer_broadcast_on_state < INT_MAX)
165 tick_broadcast_enable();
166 else
167 tick_broadcast_disable();
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800168}
169
Hidetoshi Seto918aae42009-12-14 17:10:06 +0900170static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
171{
172 smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast,
173 (void *)pr, 1);
174}
175
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800176/* Power(C) State timer broadcast control */
Len Brown7e275cc2009-05-15 02:08:44 -0400177static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800178 struct acpi_processor_cx *cx,
179 int broadcast)
180{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800181 int state = cx - pr->power.states;
182
183 if (state >= pr->power.timer_broadcast_on_state) {
Thomas Gleixner78157012015-04-03 02:12:03 +0200184 if (broadcast)
185 tick_broadcast_enter();
186 else
187 tick_broadcast_exit();
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800188 }
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800189}
190
191#else
192
Len Brown7e275cc2009-05-15 02:08:44 -0400193static void lapic_timer_check_state(int state, struct acpi_processor *pr,
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800194 struct acpi_processor_cx *cstate) { }
Len Brown7e275cc2009-05-15 02:08:44 -0400195static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
196static void lapic_timer_state_broadcast(struct acpi_processor *pr,
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -0800197 struct acpi_processor_cx *cx,
198 int broadcast)
199{
200}
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800201
202#endif
203
John Stultz592913e2010-07-13 17:56:20 -0700204#if defined(CONFIG_X86)
Len Brown520daf72009-05-14 17:27:38 -0400205static void tsc_check_state(int state)
Andi Kleenddb25f92008-01-30 13:32:41 +0100206{
207 switch (boot_cpu_data.x86_vendor) {
208 case X86_VENDOR_AMD:
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800209 case X86_VENDOR_INTEL:
Andi Kleenddb25f92008-01-30 13:32:41 +0100210 /*
211 * AMD Fam10h TSC will tick in all
212 * C/P/S0/S1 states when this bit is set.
213 */
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800214 if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
Len Brown520daf72009-05-14 17:27:38 -0400215 return;
Venki Pallipadi40fb1712008-11-17 16:11:37 -0800216
Andi Kleenddb25f92008-01-30 13:32:41 +0100217 /*FALL THROUGH*/
Andi Kleenddb25f92008-01-30 13:32:41 +0100218 default:
Len Brown520daf72009-05-14 17:27:38 -0400219 /* TSC could halt in idle, so notify users */
220 if (state > ACPI_STATE_C1)
221 mark_tsc_unstable("TSC halts in idle");
Andi Kleenddb25f92008-01-30 13:32:41 +0100222 }
223}
Len Brown520daf72009-05-14 17:27:38 -0400224#else
225static void tsc_check_state(int state) { return; }
Andi Kleenddb25f92008-01-30 13:32:41 +0100226#endif
227
Len Brown4be44fc2005-08-05 00:44:28 -0400228static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 if (!pr->pblk)
Patrick Mocheld550d982006-06-27 00:41:40 -0400232 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 /* if info is obtained from pblk/fadt, type equals state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
236 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
237
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400238#ifndef CONFIG_HOTPLUG_CPU
239 /*
240 * Check for P_LVL2_UP flag before entering C2 and above on
Len Brown4f86d3a2007-10-03 18:58:00 -0400241 * an SMP system.
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400242 */
Alexey Starikovskiyad71860a2007-02-02 19:48:19 +0300243 if ((num_online_cpus() > 1) &&
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300244 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
Patrick Mocheld550d982006-06-27 00:41:40 -0400245 return -ENODEV;
Venkatesh Pallipadi4c033552005-09-15 12:20:00 -0400246#endif
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 /* determine C2 and C3 address from pblk */
249 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
250 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
251
252 /* determine latencies from FADT */
Bob Mooreba494be2012-07-12 09:40:10 +0800253 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency;
254 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Len Brown5d76b6f2010-01-19 22:41:14 -0500256 /*
257 * FADT specified C2 latency must be less than or equal to
258 * 100 microseconds.
259 */
Bob Mooreba494be2012-07-12 09:40:10 +0800260 if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
Len Brown5d76b6f2010-01-19 22:41:14 -0500261 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bob Mooreba494be2012-07-12 09:40:10 +0800262 "C2 latency too large [%d]\n", acpi_gbl_FADT.c2_latency));
Len Brown5d76b6f2010-01-19 22:41:14 -0500263 /* invalidate C2 */
264 pr->power.states[ACPI_STATE_C2].address = 0;
265 }
266
Len Browna6d72c12010-01-19 23:10:04 -0500267 /*
268 * FADT supplied C3 latency must be less than or equal to
269 * 1000 microseconds.
270 */
Bob Mooreba494be2012-07-12 09:40:10 +0800271 if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
Len Browna6d72c12010-01-19 23:10:04 -0500272 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bob Mooreba494be2012-07-12 09:40:10 +0800273 "C3 latency too large [%d]\n", acpi_gbl_FADT.c3_latency));
Len Browna6d72c12010-01-19 23:10:04 -0500274 /* invalidate C3 */
275 pr->power.states[ACPI_STATE_C3].address = 0;
276 }
277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
279 "lvl2[0x%08x] lvl3[0x%08x]\n",
280 pr->power.states[ACPI_STATE_C2].address,
281 pr->power.states[ACPI_STATE_C3].address));
282
Patrick Mocheld550d982006-06-27 00:41:40 -0400283 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700286static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500287{
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700288 if (!pr->power.states[ACPI_STATE_C1].valid) {
289 /* set the first C-State to C1 */
290 /* all processors need to support C1 */
291 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
292 pr->power.states[ACPI_STATE_C1].valid = 1;
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400293 pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
Yazen Ghannam248e8842018-01-29 14:22:49 -0600294
295 snprintf(pr->power.states[ACPI_STATE_C1].desc,
296 ACPI_CX_DESC_LEN, "ACPI HLT");
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700297 }
298 /* the C0 state only exists as a filler in our array */
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500299 pr->power.states[ACPI_STATE_C0].valid = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400300 return 0;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500301}
302
Len Brown4be44fc2005-08-05 00:44:28 -0400303static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Sudeep Holla6fd80502014-11-25 14:48:50 +0000305 acpi_status status;
Lin Ming439913f2010-01-28 10:53:19 +0800306 u64 count;
Janosch Machowinskicf824782005-08-20 08:02:00 -0400307 int current_count;
Sudeep Holla6fd80502014-11-25 14:48:50 +0000308 int i, ret = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
310 union acpi_object *cst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (nocst)
Patrick Mocheld550d982006-06-27 00:41:40 -0400313 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700315 current_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
318 if (ACPI_FAILURE(status)) {
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400320 return -ENODEV;
Len Brown4be44fc2005-08-05 00:44:28 -0400321 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200323 cst = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 /* There must be at least 2 elements */
326 if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
Sudeep Hollab6ec26f2015-12-02 14:10:44 +0000327 pr_err("not enough elements in _CST\n");
Sudeep Holla6fd80502014-11-25 14:48:50 +0000328 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 goto end;
330 }
331
332 count = cst->package.elements[0].integer.value;
333
334 /* Validate number of power states. */
335 if (count < 1 || count != cst->package.count - 1) {
Sudeep Hollab6ec26f2015-12-02 14:10:44 +0000336 pr_err("count given by _CST is not valid\n");
Sudeep Holla6fd80502014-11-25 14:48:50 +0000337 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 goto end;
339 }
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 /* Tell driver that at least _CST is supported. */
342 pr->flags.has_cst = 1;
343
344 for (i = 1; i <= count; i++) {
345 union acpi_object *element;
346 union acpi_object *obj;
347 struct acpi_power_register *reg;
348 struct acpi_processor_cx cx;
349
350 memset(&cx, 0, sizeof(cx));
351
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200352 element = &(cst->package.elements[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 if (element->type != ACPI_TYPE_PACKAGE)
354 continue;
355
356 if (element->package.count != 4)
357 continue;
358
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200359 obj = &(element->package.elements[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 if (obj->type != ACPI_TYPE_BUFFER)
362 continue;
363
Len Brown4be44fc2005-08-05 00:44:28 -0400364 reg = (struct acpi_power_register *)obj->buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
Len Brown4be44fc2005-08-05 00:44:28 -0400367 (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 continue;
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 /* There should be an easy way to extract an integer... */
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200371 obj = &(element->package.elements[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 if (obj->type != ACPI_TYPE_INTEGER)
373 continue;
374
375 cx.type = obj->integer.value;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700376 /*
377 * Some buggy BIOSes won't list C1 in _CST -
378 * Let acpi_processor_get_power_info_default() handle them later
379 */
380 if (i == 1 && cx.type != ACPI_STATE_C1)
381 current_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700383 cx.address = reg->address;
384 cx.index = current_count + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800386 cx.entry_method = ACPI_CSTATE_SYSTEMIO;
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700387 if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
388 if (acpi_processor_ffh_cstate_probe
389 (pr->id, &cx, reg) == 0) {
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800390 cx.entry_method = ACPI_CSTATE_FFH;
391 } else if (cx.type == ACPI_STATE_C1) {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700392 /*
393 * C1 is a special case where FIXED_HARDWARE
394 * can be handled in non-MWAIT way as well.
395 * In that case, save this _CST entry info.
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700396 * Otherwise, ignore this info and continue.
397 */
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800398 cx.entry_method = ACPI_CSTATE_HALT;
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800399 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800400 } else {
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700401 continue;
402 }
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800403 if (cx.type == ACPI_STATE_C1 &&
Thomas Renningerd1896042010-11-03 17:06:14 +0100404 (boot_option_idle_override == IDLE_NOMWAIT)) {
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800405 /*
406 * In most cases the C1 space_id obtained from
407 * _CST object is FIXED_HARDWARE access mode.
408 * But when the option of idle=halt is added,
409 * the entry_method type should be changed from
410 * CSTATE_FFH to CSTATE_HALT.
Zhao Yakuida5e09a2008-06-24 18:01:09 +0800411 * When the option of idle=nomwait is added,
412 * the C1 entry_method type should be
413 * CSTATE_HALT.
Zhao Yakuic1e3b372008-06-24 17:58:53 +0800414 */
415 cx.entry_method = ACPI_CSTATE_HALT;
416 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
417 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800418 } else {
419 snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
420 cx.address);
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700421 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Venkatesh Pallipadi0fda6b42008-04-09 21:31:46 -0400423 if (cx.type == ACPI_STATE_C1) {
424 cx.valid = 1;
425 }
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800426
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200427 obj = &(element->package.elements[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (obj->type != ACPI_TYPE_INTEGER)
429 continue;
430
431 cx.latency = obj->integer.value;
432
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200433 obj = &(element->package.elements[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (obj->type != ACPI_TYPE_INTEGER)
435 continue;
436
Janosch Machowinskicf824782005-08-20 08:02:00 -0400437 current_count++;
438 memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
439
440 /*
441 * We support total ACPI_PROCESSOR_MAX_POWER - 1
442 * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
443 */
444 if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
Sudeep Hollab6ec26f2015-12-02 14:10:44 +0000445 pr_warn("Limiting number of power states to max (%d)\n",
446 ACPI_PROCESSOR_MAX_POWER);
447 pr_warn("Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
Janosch Machowinskicf824782005-08-20 08:02:00 -0400448 break;
449 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
451
Len Brown4be44fc2005-08-05 00:44:28 -0400452 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
Janosch Machowinskicf824782005-08-20 08:02:00 -0400453 current_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 /* Validate number of power states discovered */
Janosch Machowinskicf824782005-08-20 08:02:00 -0400456 if (current_count < 2)
Sudeep Holla6fd80502014-11-25 14:48:50 +0000457 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Len Brown4be44fc2005-08-05 00:44:28 -0400459 end:
Len Brown02438d82006-06-30 03:19:10 -0400460 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Sudeep Holla6fd80502014-11-25 14:48:50 +0000462 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
Len Brown4be44fc2005-08-05 00:44:28 -0400465static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
466 struct acpi_processor_cx *cx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700468 static int bm_check_flag = -1;
469 static int bm_control_flag = -1;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 if (!cx->address)
Patrick Mocheld550d982006-06-27 00:41:40 -0400473 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
477 * DMA transfers are used by any ISA device to avoid livelock.
478 * Note that we could disable Type-F DMA (as recommended by
479 * the erratum), but this is known to disrupt certain ISA
480 * devices thus we take the conservative approach.
481 */
482 else if (errata.piix4.fdma) {
483 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400484 "C3 not supported on PIIX4 with Type-F DMA\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400485 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 }
487
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400488 /* All the logic here assumes flags.bm_check is same across all CPUs */
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700489 if (bm_check_flag == -1) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400490 /* Determine whether bm_check is needed based on CPU */
491 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
492 bm_check_flag = pr->flags.bm_check;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700493 bm_control_flag = pr->flags.bm_control;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400494 } else {
495 pr->flags.bm_check = bm_check_flag;
Pallipadi, Venkateshee1ca482009-05-21 17:09:10 -0700496 pr->flags.bm_control = bm_control_flag;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400497 }
498
499 if (pr->flags.bm_check) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400500 if (!pr->flags.bm_control) {
Venki Pallipadied3110e2007-07-31 12:04:31 -0700501 if (pr->flags.has_cst != 1) {
502 /* bus mastering control is necessary */
503 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
504 "C3 support requires BM control\n"));
505 return;
506 } else {
507 /* Here we enter C3 without bus mastering */
508 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
509 "C3 support without BM control\n"));
510 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400511 }
512 } else {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400513 /*
514 * WBINVD should be set in fadt, for C3 state to be
515 * supported on when bm_check is not required.
516 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300517 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400518 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400519 "Cache invalidation should work properly"
520 " for C3 to be enabled on SMP systems\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400521 return;
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400522 }
Venkatesh Pallipadi02df8b92005-04-15 15:07:10 -0400523 }
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 /*
526 * Otherwise we've met all of our C3 requirements.
527 * Normalize the C3 latency to expidite policy. Enable
528 * checking of bus mastering status (bm_check) so we can
529 * use this in our C3 policy
530 */
531 cx->valid = 1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400532
Len Brown31878dd2009-01-28 18:28:09 -0500533 /*
534 * On older chipsets, BM_RLD needs to be set
535 * in order for Bus Master activity to wake the
536 * system from C3. Newer chipsets handle DMA
537 * during C3 automatically and BM_RLD is a NOP.
538 * In either case, the proper way to
539 * handle BM_RLD is to set it and leave it set.
540 */
Bob Moore50ffba12009-02-23 15:02:07 +0800541 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Patrick Mocheld550d982006-06-27 00:41:40 -0400543 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544}
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546static int acpi_processor_power_verify(struct acpi_processor *pr)
547{
548 unsigned int i;
549 unsigned int working = 0;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100550
Thomas Gleixner169a0ab2007-02-16 01:27:55 -0800551 pr->power.timer_broadcast_on_state = INT_MAX;
Venkatesh Pallipadi6eb0a0f2006-01-11 22:44:21 +0100552
Len Browna0bf2842009-05-15 01:29:31 -0400553 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 struct acpi_processor_cx *cx = &pr->power.states[i];
555
556 switch (cx->type) {
557 case ACPI_STATE_C1:
558 cx->valid = 1;
559 break;
560
561 case ACPI_STATE_C2:
Len Brownd22edd22010-01-19 23:29:09 -0500562 if (!cx->address)
563 break;
Al Stonecad15252013-12-04 12:59:11 -0700564 cx->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 break;
566
567 case ACPI_STATE_C3:
568 acpi_processor_power_verify_c3(pr, cx);
569 break;
570 }
Len Brown7e275cc2009-05-15 02:08:44 -0400571 if (!cx->valid)
572 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Len Brown7e275cc2009-05-15 02:08:44 -0400574 lapic_timer_check_state(i, pr, cx);
575 tsc_check_state(cx->type);
576 working++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
578
Hidetoshi Seto918aae42009-12-14 17:10:06 +0900579 lapic_timer_propagate_broadcast(pr);
Andi Kleenbd663342006-03-25 16:31:07 +0100580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return (working);
582}
583
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100584static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585{
586 unsigned int i;
587 int result;
588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 /* NOTE: the idle thread may not be running while calling
591 * this function */
592
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700593 /* Zero initialize all the C-states info. */
594 memset(pr->power.states, 0, sizeof(pr->power.states));
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 result = acpi_processor_get_power_info_cst(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400597 if (result == -ENODEV)
Darrick J. Wongc5a114f2006-10-19 23:28:28 -0700598 result = acpi_processor_get_power_info_fadt(pr);
Venkatesh Pallipadi6d93c642005-09-15 12:19:00 -0400599
Venkatesh Pallipadi991528d2006-09-25 16:28:13 -0700600 if (result)
601 return result;
602
603 acpi_processor_get_power_info_default(pr);
604
Janosch Machowinskicf824782005-08-20 08:02:00 -0400605 pr->power.count = acpi_processor_power_verify(pr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 /*
608 * if one state of type C2 or C3 is available, mark this
609 * CPU as being "idle manageable"
610 */
611 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500612 if (pr->power.states[i].valid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 pr->power.count = i;
Linus Torvalds2203d6e2005-11-18 07:29:51 -0800614 if (pr->power.states[i].type >= ACPI_STATE_C2)
615 pr->flags.power = 1;
Venkatesh Pallipadiacf05f42005-03-31 23:23:15 -0500616 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618
Patrick Mocheld550d982006-06-27 00:41:40 -0400619 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
Len Brown4f86d3a2007-10-03 18:58:00 -0400622/**
623 * acpi_idle_bm_check - checks if bus master activity was detected
624 */
625static int acpi_idle_bm_check(void)
626{
627 u32 bm_status = 0;
628
Len Brownd3e7e992010-07-22 17:23:10 -0400629 if (bm_check_disable)
630 return 0;
631
Bob Moore50ffba12009-02-23 15:02:07 +0800632 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
Len Brown4f86d3a2007-10-03 18:58:00 -0400633 if (bm_status)
Bob Moore50ffba12009-02-23 15:02:07 +0800634 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400635 /*
636 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
637 * the true state of bus mastering activity; forcing us to
638 * manually check the BMIDEA bit of each IDE channel.
639 */
640 else if (errata.piix4.bmisx) {
641 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
642 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
643 bm_status = 1;
644 }
645 return bm_status;
646}
647
648/**
Rafael J. Wysockib00783f2015-02-02 23:55:08 +0100649 * acpi_idle_do_entry - enter idle state using the appropriate method
Len Brown4f86d3a2007-10-03 18:58:00 -0400650 * @cx: cstate data
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800651 *
652 * Caller disables interrupt before call and enables interrupt after return.
Len Brown4f86d3a2007-10-03 18:58:00 -0400653 */
Chris Metcalf6727ad92016-10-07 17:02:55 -0700654static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
Len Brown4f86d3a2007-10-03 18:58:00 -0400655{
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800656 if (cx->entry_method == ACPI_CSTATE_FFH) {
Len Brown4f86d3a2007-10-03 18:58:00 -0400657 /* Call into architectural FFH based C-state */
658 acpi_processor_ffh_cstate_enter(cx);
venkatesh.pallipadi@intel.combc71bec2008-01-31 17:35:04 -0800659 } else if (cx->entry_method == ACPI_CSTATE_HALT) {
660 acpi_safe_halt();
Len Brown4f86d3a2007-10-03 18:58:00 -0400661 } else {
Len Brown4f86d3a2007-10-03 18:58:00 -0400662 /* IO port based C-state */
663 inb(cx->address);
664 /* Dummy wait op - must do something useless after P_LVL2 read
665 because chipsets cannot guarantee that STPCLK# signal
666 gets asserted in time to freeze execution properly. */
Andi Kleencfa806f2010-07-20 15:18:36 -0700667 inl(acpi_gbl_FADT.xpm_timer_block.address);
Len Brown4f86d3a2007-10-03 18:58:00 -0400668 }
669}
670
671/**
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100672 * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining)
673 * @dev: the target CPU
674 * @index: the index of suggested state
675 */
676static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
677{
Alex Shi6240a102013-04-02 01:56:54 +0200678 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100679
680 ACPI_FLUSH_CPU_CACHE();
681
682 while (1) {
683
684 if (cx->entry_method == ACPI_CSTATE_HALT)
Luck, Tony54f70072012-04-03 09:37:28 -0700685 safe_halt();
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100686 else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
687 inb(cx->address);
688 /* See comment in acpi_idle_do_entry() */
689 inl(acpi_gbl_FADT.xpm_timer_block.address);
690 } else
691 return -ENODEV;
692 }
693
694 /* Never reached */
695 return 0;
696}
697
Rafael J. Wysockiadcb2622015-02-02 23:55:42 +0100698static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
699{
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100700 return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst &&
701 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED);
Rafael J. Wysockiadcb2622015-02-02 23:55:42 +0100702}
703
Len Brown4f86d3a2007-10-03 18:58:00 -0400704static int c3_cpu_count;
Thomas Gleixnere12f65f2009-07-25 18:14:37 +0200705static DEFINE_RAW_SPINLOCK(c3_lock);
Len Brown4f86d3a2007-10-03 18:58:00 -0400706
707/**
708 * acpi_idle_enter_bm - enters C3 with proper BM handling
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100709 * @pr: Target processor
710 * @cx: Target state context
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100711 * @timer_bc: Whether or not to change timer mode to broadcast
Len Brown4f86d3a2007-10-03 18:58:00 -0400712 */
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100713static void acpi_idle_enter_bm(struct acpi_processor *pr,
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100714 struct acpi_processor_cx *cx, bool timer_bc)
Len Brown4f86d3a2007-10-03 18:58:00 -0400715{
Andy Lutomirski67535732017-11-04 04:16:12 -0700716 acpi_unlazy_tlb(smp_processor_id());
717
Len Brown4f86d3a2007-10-03 18:58:00 -0400718 /*
719 * Must be done before busmaster disable as we might need to
720 * access HPET !
721 */
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100722 if (timer_bc)
723 lapic_timer_state_broadcast(pr, cx, 1);
Len Brown4f86d3a2007-10-03 18:58:00 -0400724
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500725 /*
726 * disable bus master
727 * bm_check implies we need ARB_DIS
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500728 * bm_control implies whether we can do ARB_DIS
729 *
730 * That leaves a case where bm_check is set and bm_control is
731 * not set. In that case we cannot do much, we enter C3
732 * without doing anything.
733 */
Rafael J. Wysocki2a738352015-02-02 23:56:03 +0100734 if (pr->flags.bm_control) {
Thomas Gleixnere12f65f2009-07-25 18:14:37 +0200735 raw_spin_lock(&c3_lock);
Len Brown4f86d3a2007-10-03 18:58:00 -0400736 c3_cpu_count++;
737 /* Disable bus master arbitration when all CPUs are in C3 */
738 if (c3_cpu_count == num_online_cpus())
Bob Moore50ffba12009-02-23 15:02:07 +0800739 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
Thomas Gleixnere12f65f2009-07-25 18:14:37 +0200740 raw_spin_unlock(&c3_lock);
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500741 }
Len Brown4f86d3a2007-10-03 18:58:00 -0400742
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500743 acpi_idle_do_entry(cx);
Len Brown4f86d3a2007-10-03 18:58:00 -0400744
Venkatesh Pallipadiddc081a2007-11-19 21:43:22 -0500745 /* Re-enable bus master arbitration */
Rafael J. Wysocki2a738352015-02-02 23:56:03 +0100746 if (pr->flags.bm_control) {
Thomas Gleixnere12f65f2009-07-25 18:14:37 +0200747 raw_spin_lock(&c3_lock);
Bob Moore50ffba12009-02-23 15:02:07 +0800748 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
Len Brown4f86d3a2007-10-03 18:58:00 -0400749 c3_cpu_count--;
Thomas Gleixnere12f65f2009-07-25 18:14:37 +0200750 raw_spin_unlock(&c3_lock);
Len Brown4f86d3a2007-10-03 18:58:00 -0400751 }
752
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100753 if (timer_bc)
754 lapic_timer_state_broadcast(pr, cx, 0);
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100755}
756
757static int acpi_idle_enter(struct cpuidle_device *dev,
758 struct cpuidle_driver *drv, int index)
759{
760 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
761 struct acpi_processor *pr;
762
763 pr = __this_cpu_read(processors);
764 if (unlikely(!pr))
765 return -EINVAL;
766
767 if (cx->type != ACPI_STATE_C1) {
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100768 if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) {
Rafael J. Wysockidc2251b2017-08-23 23:19:57 +0200769 index = ACPI_IDLE_STATE_START;
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100770 cx = per_cpu(acpi_cstate[index], dev->cpu);
771 } else if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check) {
772 if (cx->bm_sts_skip || !acpi_idle_bm_check()) {
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100773 acpi_idle_enter_bm(pr, cx, true);
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100774 return index;
775 } else if (drv->safe_state_index >= 0) {
776 index = drv->safe_state_index;
777 cx = per_cpu(acpi_cstate[index], dev->cpu);
778 } else {
779 acpi_safe_halt();
780 return -EBUSY;
781 }
782 }
783 }
784
785 lapic_timer_state_broadcast(pr, cx, 1);
786
787 if (cx->type == ACPI_STATE_C3)
788 ACPI_FLUSH_CPU_CACHE();
789
790 acpi_idle_do_entry(cx);
791
792 lapic_timer_state_broadcast(pr, cx, 0);
793
Deepthi Dharware978aa72011-10-28 16:20:09 +0530794 return index;
Len Brown4f86d3a2007-10-03 18:58:00 -0400795}
796
Rafael J. Wysocki28ba0862017-08-10 00:14:45 +0200797static void acpi_idle_enter_s2idle(struct cpuidle_device *dev,
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100798 struct cpuidle_driver *drv, int index)
799{
800 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
801
802 if (cx->type == ACPI_STATE_C3) {
803 struct acpi_processor *pr = __this_cpu_read(processors);
804
805 if (unlikely(!pr))
806 return;
807
808 if (pr->flags.bm_check) {
809 acpi_idle_enter_bm(pr, cx, false);
810 return;
811 } else {
812 ACPI_FLUSH_CPU_CACHE();
813 }
814 }
815 acpi_idle_do_entry(cx);
816}
817
Daniel Lezcano6ef0f082013-02-04 22:44:42 +0000818static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
819 struct cpuidle_device *dev)
Len Brown4f86d3a2007-10-03 18:58:00 -0400820{
Rafael J. Wysockidc2251b2017-08-23 23:19:57 +0200821 int i, count = ACPI_IDLE_STATE_START;
Len Brown4f86d3a2007-10-03 18:58:00 -0400822 struct acpi_processor_cx *cx;
Len Brown4f86d3a2007-10-03 18:58:00 -0400823
Len Brown615dfd92009-04-23 23:21:29 -0400824 if (max_cstate == 0)
825 max_cstate = 1;
826
Len Brown4f86d3a2007-10-03 18:58:00 -0400827 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
828 cx = &pr->power.states[i];
Len Brown4f86d3a2007-10-03 18:58:00 -0400829
830 if (!cx->valid)
831 continue;
832
Alex Shi6240a102013-04-02 01:56:54 +0200833 per_cpu(acpi_cstate[count], dev->cpu) = cx;
Len Brown4f86d3a2007-10-03 18:58:00 -0400834
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530835 count++;
836 if (count == CPUIDLE_STATE_MAX)
837 break;
838 }
839
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530840 if (!count)
841 return -EINVAL;
842
843 return 0;
844}
845
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100846static int acpi_processor_setup_cstates(struct acpi_processor *pr)
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530847{
Rafael J. Wysocki1b39e3f2017-08-29 03:14:37 +0200848 int i, count;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530849 struct acpi_processor_cx *cx;
850 struct cpuidle_state *state;
851 struct cpuidle_driver *drv = &acpi_idle_driver;
852
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530853 if (max_cstate == 0)
854 max_cstate = 1;
855
Rafael J. Wysocki1b39e3f2017-08-29 03:14:37 +0200856 if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) {
857 cpuidle_poll_state_init(drv);
858 count = 1;
859 } else {
860 count = 0;
861 }
862
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530863 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
864 cx = &pr->power.states[i];
865
866 if (!cx->valid)
867 continue;
868
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530869 state = &drv->states[count];
Len Brown4f86d3a2007-10-03 18:58:00 -0400870 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100871 strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
Len Brown4f86d3a2007-10-03 18:58:00 -0400872 state->exit_latency = cx->latency;
Len Brown4963f622007-12-13 23:50:45 -0500873 state->target_residency = cx->latency * latency_factor;
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100874 state->enter = acpi_idle_enter;
Len Brown4f86d3a2007-10-03 18:58:00 -0400875
876 state->flags = 0;
Rafael J. Wysocki6491bc02015-02-03 21:55:11 +0100877 if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100878 state->enter_dead = acpi_idle_play_dead;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530879 drv->safe_state_index = count;
Len Brown4f86d3a2007-10-03 18:58:00 -0400880 }
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100881 /*
Rafael J. Wysocki28ba0862017-08-10 00:14:45 +0200882 * Halt-induced C1 is not good for ->enter_s2idle, because it
Rafael J. Wysocki5f508182015-02-11 05:04:57 +0100883 * re-enables interrupts on exit. Moreover, C1 is generally not
884 * particularly interesting from the suspend-to-idle angle, so
885 * avoid C1 and the situations in which we may need to fall back
886 * to it altogether.
887 */
888 if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
Rafael J. Wysocki28ba0862017-08-10 00:14:45 +0200889 state->enter_s2idle = acpi_idle_enter_s2idle;
Len Brown4f86d3a2007-10-03 18:58:00 -0400890
891 count++;
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800892 if (count == CPUIDLE_STATE_MAX)
893 break;
Len Brown4f86d3a2007-10-03 18:58:00 -0400894 }
895
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530896 drv->state_count = count;
Len Brown4f86d3a2007-10-03 18:58:00 -0400897
898 if (!count)
899 return -EINVAL;
900
Len Brown4f86d3a2007-10-03 18:58:00 -0400901 return 0;
902}
903
Sudeep Holla35ae7132016-07-19 18:52:53 +0100904static inline void acpi_processor_cstate_first_run_checks(void)
905{
906 acpi_status status;
907 static int first_run;
908
909 if (first_run)
910 return;
911 dmi_check_system(processor_power_dmi_table);
912 max_cstate = acpi_processor_cstate_check(max_cstate);
913 if (max_cstate < ACPI_C_STATES_MAX)
914 pr_notice("ACPI: processor limited to max C-state %d\n",
915 max_cstate);
916 first_run++;
917
918 if (acpi_gbl_FADT.cst_control && !nocst) {
919 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
920 acpi_gbl_FADT.cst_control, 8);
921 if (ACPI_FAILURE(status))
922 ACPI_EXCEPTION((AE_INFO, status,
923 "Notifying BIOS of _CST ability failed"));
924 }
925}
926#else
927
928static inline int disabled_by_idle_boot_param(void) { return 0; }
929static inline void acpi_processor_cstate_first_run_checks(void) { }
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100930static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
Sudeep Holla35ae7132016-07-19 18:52:53 +0100931{
932 return -ENODEV;
933}
934
935static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
936 struct cpuidle_device *dev)
937{
938 return -EINVAL;
939}
940
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100941static int acpi_processor_setup_cstates(struct acpi_processor *pr)
Sudeep Holla35ae7132016-07-19 18:52:53 +0100942{
943 return -EINVAL;
944}
945
946#endif /* CONFIG_ACPI_PROCESSOR_CSTATE */
947
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +0100948struct acpi_lpi_states_array {
949 unsigned int size;
950 unsigned int composite_states_size;
951 struct acpi_lpi_state *entries;
952 struct acpi_lpi_state *composite_states[ACPI_PROCESSOR_MAX_POWER];
953};
954
955static int obj_get_integer(union acpi_object *obj, u32 *value)
956{
957 if (obj->type != ACPI_TYPE_INTEGER)
958 return -EINVAL;
959
960 *value = obj->integer.value;
961 return 0;
962}
963
964static int acpi_processor_evaluate_lpi(acpi_handle handle,
965 struct acpi_lpi_states_array *info)
966{
967 acpi_status status;
968 int ret = 0;
969 int pkg_count, state_idx = 1, loop;
970 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
971 union acpi_object *lpi_data;
972 struct acpi_lpi_state *lpi_state;
973
974 status = acpi_evaluate_object(handle, "_LPI", NULL, &buffer);
975 if (ACPI_FAILURE(status)) {
976 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _LPI, giving up\n"));
977 return -ENODEV;
978 }
979
980 lpi_data = buffer.pointer;
981
982 /* There must be at least 4 elements = 3 elements + 1 package */
983 if (!lpi_data || lpi_data->type != ACPI_TYPE_PACKAGE ||
984 lpi_data->package.count < 4) {
985 pr_debug("not enough elements in _LPI\n");
986 ret = -ENODATA;
987 goto end;
988 }
989
990 pkg_count = lpi_data->package.elements[2].integer.value;
991
992 /* Validate number of power states. */
993 if (pkg_count < 1 || pkg_count != lpi_data->package.count - 3) {
994 pr_debug("count given by _LPI is not valid\n");
995 ret = -ENODATA;
996 goto end;
997 }
998
999 lpi_state = kcalloc(pkg_count, sizeof(*lpi_state), GFP_KERNEL);
1000 if (!lpi_state) {
1001 ret = -ENOMEM;
1002 goto end;
1003 }
1004
1005 info->size = pkg_count;
1006 info->entries = lpi_state;
1007
1008 /* LPI States start at index 3 */
1009 for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, lpi_state++) {
1010 union acpi_object *element, *pkg_elem, *obj;
1011
1012 element = &lpi_data->package.elements[loop];
1013 if (element->type != ACPI_TYPE_PACKAGE || element->package.count < 7)
1014 continue;
1015
1016 pkg_elem = element->package.elements;
1017
1018 obj = pkg_elem + 6;
1019 if (obj->type == ACPI_TYPE_BUFFER) {
1020 struct acpi_power_register *reg;
1021
1022 reg = (struct acpi_power_register *)obj->buffer.pointer;
1023 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
1024 reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)
1025 continue;
1026
1027 lpi_state->address = reg->address;
1028 lpi_state->entry_method =
1029 reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE ?
1030 ACPI_CSTATE_FFH : ACPI_CSTATE_SYSTEMIO;
1031 } else if (obj->type == ACPI_TYPE_INTEGER) {
1032 lpi_state->entry_method = ACPI_CSTATE_INTEGER;
1033 lpi_state->address = obj->integer.value;
1034 } else {
1035 continue;
1036 }
1037
1038 /* elements[7,8] skipped for now i.e. Residency/Usage counter*/
1039
1040 obj = pkg_elem + 9;
1041 if (obj->type == ACPI_TYPE_STRING)
1042 strlcpy(lpi_state->desc, obj->string.pointer,
1043 ACPI_CX_DESC_LEN);
1044
1045 lpi_state->index = state_idx;
1046 if (obj_get_integer(pkg_elem + 0, &lpi_state->min_residency)) {
1047 pr_debug("No min. residency found, assuming 10 us\n");
1048 lpi_state->min_residency = 10;
1049 }
1050
1051 if (obj_get_integer(pkg_elem + 1, &lpi_state->wake_latency)) {
1052 pr_debug("No wakeup residency found, assuming 10 us\n");
1053 lpi_state->wake_latency = 10;
1054 }
1055
1056 if (obj_get_integer(pkg_elem + 2, &lpi_state->flags))
1057 lpi_state->flags = 0;
1058
1059 if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags))
1060 lpi_state->arch_flags = 0;
1061
1062 if (obj_get_integer(pkg_elem + 4, &lpi_state->res_cnt_freq))
1063 lpi_state->res_cnt_freq = 1;
1064
1065 if (obj_get_integer(pkg_elem + 5, &lpi_state->enable_parent_state))
1066 lpi_state->enable_parent_state = 0;
1067 }
1068
1069 acpi_handle_debug(handle, "Found %d power states\n", state_idx);
1070end:
1071 kfree(buffer.pointer);
1072 return ret;
1073}
1074
1075/*
1076 * flat_state_cnt - the number of composite LPI states after the process of flattening
1077 */
1078static int flat_state_cnt;
1079
1080/**
1081 * combine_lpi_states - combine local and parent LPI states to form a composite LPI state
1082 *
1083 * @local: local LPI state
1084 * @parent: parent LPI state
1085 * @result: composite LPI state
1086 */
1087static bool combine_lpi_states(struct acpi_lpi_state *local,
1088 struct acpi_lpi_state *parent,
1089 struct acpi_lpi_state *result)
1090{
1091 if (parent->entry_method == ACPI_CSTATE_INTEGER) {
1092 if (!parent->address) /* 0 means autopromotable */
1093 return false;
1094 result->address = local->address + parent->address;
1095 } else {
1096 result->address = parent->address;
1097 }
1098
1099 result->min_residency = max(local->min_residency, parent->min_residency);
1100 result->wake_latency = local->wake_latency + parent->wake_latency;
1101 result->enable_parent_state = parent->enable_parent_state;
1102 result->entry_method = local->entry_method;
1103
1104 result->flags = parent->flags;
1105 result->arch_flags = parent->arch_flags;
1106 result->index = parent->index;
1107
1108 strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
1109 strlcat(result->desc, "+", ACPI_CX_DESC_LEN);
1110 strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN);
1111 return true;
1112}
1113
1114#define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0)
1115
1116static void stash_composite_state(struct acpi_lpi_states_array *curr_level,
1117 struct acpi_lpi_state *t)
1118{
1119 curr_level->composite_states[curr_level->composite_states_size++] = t;
1120}
1121
1122static int flatten_lpi_states(struct acpi_processor *pr,
1123 struct acpi_lpi_states_array *curr_level,
1124 struct acpi_lpi_states_array *prev_level)
1125{
1126 int i, j, state_count = curr_level->size;
1127 struct acpi_lpi_state *p, *t = curr_level->entries;
1128
1129 curr_level->composite_states_size = 0;
1130 for (j = 0; j < state_count; j++, t++) {
1131 struct acpi_lpi_state *flpi;
1132
1133 if (!(t->flags & ACPI_LPI_STATE_FLAGS_ENABLED))
1134 continue;
1135
1136 if (flat_state_cnt >= ACPI_PROCESSOR_MAX_POWER) {
1137 pr_warn("Limiting number of LPI states to max (%d)\n",
1138 ACPI_PROCESSOR_MAX_POWER);
1139 pr_warn("Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
1140 break;
1141 }
1142
1143 flpi = &pr->power.lpi_states[flat_state_cnt];
1144
1145 if (!prev_level) { /* leaf/processor node */
1146 memcpy(flpi, t, sizeof(*t));
1147 stash_composite_state(curr_level, flpi);
1148 flat_state_cnt++;
1149 continue;
1150 }
1151
1152 for (i = 0; i < prev_level->composite_states_size; i++) {
1153 p = prev_level->composite_states[i];
1154 if (t->index <= p->enable_parent_state &&
1155 combine_lpi_states(p, t, flpi)) {
1156 stash_composite_state(curr_level, flpi);
1157 flat_state_cnt++;
1158 flpi++;
1159 }
1160 }
1161 }
1162
1163 kfree(curr_level->entries);
1164 return 0;
1165}
1166
1167static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
1168{
1169 int ret, i;
1170 acpi_status status;
1171 acpi_handle handle = pr->handle, pr_ahandle;
1172 struct acpi_device *d = NULL;
1173 struct acpi_lpi_states_array info[2], *tmp, *prev, *curr;
1174
1175 if (!osc_pc_lpi_support_confirmed)
1176 return -EOPNOTSUPP;
1177
1178 if (!acpi_has_method(handle, "_LPI"))
1179 return -EINVAL;
1180
1181 flat_state_cnt = 0;
1182 prev = &info[0];
1183 curr = &info[1];
1184 handle = pr->handle;
1185 ret = acpi_processor_evaluate_lpi(handle, prev);
1186 if (ret)
1187 return ret;
1188 flatten_lpi_states(pr, prev, NULL);
1189
1190 status = acpi_get_parent(handle, &pr_ahandle);
1191 while (ACPI_SUCCESS(status)) {
1192 acpi_bus_get_device(pr_ahandle, &d);
1193 handle = pr_ahandle;
1194
1195 if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
1196 break;
1197
1198 /* can be optional ? */
1199 if (!acpi_has_method(handle, "_LPI"))
1200 break;
1201
1202 ret = acpi_processor_evaluate_lpi(handle, curr);
1203 if (ret)
1204 break;
1205
1206 /* flatten all the LPI states in this level of hierarchy */
1207 flatten_lpi_states(pr, curr, prev);
1208
1209 tmp = prev, prev = curr, curr = tmp;
1210
1211 status = acpi_get_parent(handle, &pr_ahandle);
1212 }
1213
1214 pr->power.count = flat_state_cnt;
1215 /* reset the index after flattening */
1216 for (i = 0; i < pr->power.count; i++)
1217 pr->power.lpi_states[i].index = i;
1218
1219 /* Tell driver that _LPI is supported. */
1220 pr->flags.has_lpi = 1;
1221 pr->flags.power = 1;
1222
1223 return 0;
1224}
1225
1226int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
1227{
1228 return -ENODEV;
1229}
1230
1231int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
1232{
1233 return -ENODEV;
1234}
1235
1236/**
1237 * acpi_idle_lpi_enter - enters an ACPI any LPI state
1238 * @dev: the target CPU
1239 * @drv: cpuidle driver containing cpuidle state info
1240 * @index: index of target state
1241 *
1242 * Return: 0 for success or negative value for error
1243 */
1244static int acpi_idle_lpi_enter(struct cpuidle_device *dev,
1245 struct cpuidle_driver *drv, int index)
1246{
1247 struct acpi_processor *pr;
1248 struct acpi_lpi_state *lpi;
1249
1250 pr = __this_cpu_read(processors);
1251
1252 if (unlikely(!pr))
1253 return -EINVAL;
1254
1255 lpi = &pr->power.lpi_states[index];
1256 if (lpi->entry_method == ACPI_CSTATE_FFH)
1257 return acpi_processor_ffh_lpi_enter(lpi);
1258
1259 return -EINVAL;
1260}
1261
1262static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
1263{
1264 int i;
1265 struct acpi_lpi_state *lpi;
1266 struct cpuidle_state *state;
1267 struct cpuidle_driver *drv = &acpi_idle_driver;
1268
1269 if (!pr->flags.has_lpi)
1270 return -EOPNOTSUPP;
1271
1272 for (i = 0; i < pr->power.count && i < CPUIDLE_STATE_MAX; i++) {
1273 lpi = &pr->power.lpi_states[i];
1274
1275 state = &drv->states[i];
1276 snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
1277 strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
1278 state->exit_latency = lpi->wake_latency;
1279 state->target_residency = lpi->min_residency;
1280 if (lpi->arch_flags)
1281 state->flags |= CPUIDLE_FLAG_TIMER_STOP;
1282 state->enter = acpi_idle_lpi_enter;
1283 drv->safe_state_index = i;
1284 }
1285
1286 drv->state_count = i;
1287
1288 return 0;
1289}
1290
1291/**
1292 * acpi_processor_setup_cpuidle_states- prepares and configures cpuidle
1293 * global state data i.e. idle routines
1294 *
1295 * @pr: the ACPI processor
1296 */
1297static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
1298{
1299 int i;
1300 struct cpuidle_driver *drv = &acpi_idle_driver;
1301
1302 if (!pr->flags.power_setup_done || !pr->flags.power)
1303 return -EINVAL;
1304
1305 drv->safe_state_index = -1;
Rafael J. Wysockidc2251b2017-08-23 23:19:57 +02001306 for (i = ACPI_IDLE_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +01001307 drv->states[i].name[0] = '\0';
1308 drv->states[i].desc[0] = '\0';
1309 }
1310
1311 if (pr->flags.has_lpi)
1312 return acpi_processor_setup_lpi_states(pr);
1313
1314 return acpi_processor_setup_cstates(pr);
1315}
1316
1317/**
1318 * acpi_processor_setup_cpuidle_dev - prepares and configures CPUIDLE
1319 * device i.e. per-cpu data
1320 *
1321 * @pr: the ACPI processor
1322 * @dev : the cpuidle device
1323 */
1324static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr,
1325 struct cpuidle_device *dev)
1326{
1327 if (!pr->flags.power_setup_done || !pr->flags.power || !dev)
1328 return -EINVAL;
1329
1330 dev->cpu = pr->id;
1331 if (pr->flags.has_lpi)
1332 return acpi_processor_ffh_lpi_probe(pr->id);
1333
1334 return acpi_processor_setup_cpuidle_cx(pr, dev);
1335}
1336
1337static int acpi_processor_get_power_info(struct acpi_processor *pr)
1338{
1339 int ret;
1340
1341 ret = acpi_processor_get_lpi_info(pr);
1342 if (ret)
1343 ret = acpi_processor_get_cstate_info(pr);
1344
1345 return ret;
1346}
1347
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301348int acpi_processor_hotplug(struct acpi_processor *pr)
Len Brown4f86d3a2007-10-03 18:58:00 -04001349{
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001350 int ret = 0;
Wei Yongjune8b1b592012-10-08 08:40:42 +08001351 struct cpuidle_device *dev;
Len Brown4f86d3a2007-10-03 18:58:00 -04001352
Thomas Renningerd1896042010-11-03 17:06:14 +01001353 if (disabled_by_idle_boot_param())
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001354 return 0;
1355
Len Brown4f86d3a2007-10-03 18:58:00 -04001356 if (!pr->flags.power_setup_done)
1357 return -ENODEV;
1358
Wei Yongjune8b1b592012-10-08 08:40:42 +08001359 dev = per_cpu(acpi_cpuidle_device, pr->id);
Len Brown4f86d3a2007-10-03 18:58:00 -04001360 cpuidle_pause_and_lock();
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001361 cpuidle_disable_device(dev);
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +01001362 ret = acpi_processor_get_power_info(pr);
1363 if (!ret && pr->flags.power) {
1364 acpi_processor_setup_cpuidle_dev(pr, dev);
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001365 ret = cpuidle_enable_device(dev);
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -04001366 }
Len Brown4f86d3a2007-10-03 18:58:00 -04001367 cpuidle_resume_and_unlock();
1368
1369 return ret;
1370}
1371
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +01001372int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301373{
1374 int cpu;
1375 struct acpi_processor *_pr;
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001376 struct cpuidle_device *dev;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301377
1378 if (disabled_by_idle_boot_param())
1379 return 0;
1380
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301381 if (!pr->flags.power_setup_done)
1382 return -ENODEV;
1383
1384 /*
1385 * FIXME: Design the ACPI notification to make it once per
1386 * system instead of once per-cpu. This condition is a hack
1387 * to make the code that updates C-States be called once.
1388 */
1389
Paul E. McKenney95056262012-02-28 13:27:44 -08001390 if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) {
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301391
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301392 /* Protect against cpu-hotplug */
1393 get_online_cpus();
Jiri Kosina67266552014-09-03 15:04:28 +02001394 cpuidle_pause_and_lock();
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301395
1396 /* Disable all cpuidle devices */
1397 for_each_online_cpu(cpu) {
1398 _pr = per_cpu(processors, cpu);
1399 if (!_pr || !_pr->flags.power_setup_done)
1400 continue;
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001401 dev = per_cpu(acpi_cpuidle_device, cpu);
1402 cpuidle_disable_device(dev);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301403 }
1404
1405 /* Populate Updated C-state information */
Thomas Schlichterf427e5f2013-01-19 00:28:22 +01001406 acpi_processor_get_power_info(pr);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301407 acpi_processor_setup_cpuidle_states(pr);
1408
1409 /* Enable all cpuidle devices */
1410 for_each_online_cpu(cpu) {
1411 _pr = per_cpu(processors, cpu);
1412 if (!_pr || !_pr->flags.power_setup_done)
1413 continue;
1414 acpi_processor_get_power_info(_pr);
1415 if (_pr->flags.power) {
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001416 dev = per_cpu(acpi_cpuidle_device, cpu);
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +01001417 acpi_processor_setup_cpuidle_dev(_pr, dev);
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001418 cpuidle_enable_device(dev);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301419 }
1420 }
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301421 cpuidle_resume_and_unlock();
Jiri Kosina67266552014-09-03 15:04:28 +02001422 put_online_cpus();
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301423 }
1424
1425 return 0;
1426}
1427
1428static int acpi_processor_registered;
1429
Paul Gortmakerfe7bf102013-06-19 14:30:58 -04001430int acpi_processor_power_init(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431{
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301432 int retval;
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001433 struct cpuidle_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
Thomas Renningerd1896042010-11-03 17:06:14 +01001435 if (disabled_by_idle_boot_param())
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001436 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Sudeep Holla35ae7132016-07-19 18:52:53 +01001438 acpi_processor_cstate_first_run_checks();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439
Sudeep Holla35ae7132016-07-19 18:52:53 +01001440 if (!acpi_processor_get_power_info(pr))
1441 pr->flags.power_setup_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442
1443 /*
1444 * Install the idle handler if processor power management is supported.
1445 * Note that we use previously set idle handler will be used on
1446 * platforms that only support C1.
1447 */
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001448 if (pr->flags.power) {
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301449 /* Register acpi_idle_driver if not already registered */
1450 if (!acpi_processor_registered) {
1451 acpi_processor_setup_cpuidle_states(pr);
1452 retval = cpuidle_register_driver(&acpi_idle_driver);
1453 if (retval)
1454 return retval;
Sudeep Hollab6ec26f2015-12-02 14:10:44 +00001455 pr_debug("%s registered with cpuidle\n",
1456 acpi_idle_driver.name);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301457 }
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001458
1459 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1460 if (!dev)
1461 return -ENOMEM;
1462 per_cpu(acpi_cpuidle_device, pr->id) = dev;
1463
Sudeep Hollaa36a7fe2016-07-21 17:18:07 +01001464 acpi_processor_setup_cpuidle_dev(pr, dev);
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001465
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301466 /* Register per-cpu cpuidle_device. Cpuidle driver
1467 * must already be registered before registering device
1468 */
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001469 retval = cpuidle_register_device(dev);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301470 if (retval) {
1471 if (acpi_processor_registered == 0)
1472 cpuidle_unregister_driver(&acpi_idle_driver);
1473 return retval;
1474 }
1475 acpi_processor_registered++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 }
Patrick Mocheld550d982006-06-27 00:41:40 -04001477 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478}
1479
Daniel Lezcano38a991b2012-09-15 22:42:54 +02001480int acpi_processor_power_exit(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481{
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001482 struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
1483
Thomas Renningerd1896042010-11-03 17:06:14 +01001484 if (disabled_by_idle_boot_param())
Venkatesh Pallipadi36a91352008-04-30 13:57:15 -04001485 return 0;
1486
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301487 if (pr->flags.power) {
Daniel Lezcano3d339dc2012-09-17 23:01:56 +02001488 cpuidle_unregister_device(dev);
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301489 acpi_processor_registered--;
1490 if (acpi_processor_registered == 0)
1491 cpuidle_unregister_driver(&acpi_idle_driver);
1492 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +05301494 pr->flags.power_setup_done = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -04001495 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496}