Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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> | |
c5ab81ca | 6 | * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> |
1da177e4 LT |
7 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
8 | * - Added processor hotplug support | |
02df8b93 VP |
9 | * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> |
10 | * - Added support for C3 on SMP | |
1da177e4 LT |
11 | * |
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 | * | |
24 | * You should have received a copy of the GNU General Public License along | |
25 | * with this program; if not, write to the Free Software Foundation, Inc., | |
26 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
27 | * | |
28 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
29 | */ | |
30 | ||
1da177e4 | 31 | #include <linux/module.h> |
1da177e4 LT |
32 | #include <linux/acpi.h> |
33 | #include <linux/dmi.h> | |
e2668fb5 | 34 | #include <linux/sched.h> /* need_resched() */ |
e9e2cdb4 | 35 | #include <linux/clockchips.h> |
4f86d3a8 | 36 | #include <linux/cpuidle.h> |
0a3b15ac | 37 | #include <linux/syscore_ops.h> |
1da177e4 | 38 | |
3434933b TG |
39 | /* |
40 | * Include the apic definitions for x86 to have the APIC timer related defines | |
41 | * available also for UP (on SMP it gets magically included via linux/smp.h). | |
42 | * asm/acpi.h is not an option, as it would require more include magic. Also | |
43 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. | |
44 | */ | |
45 | #ifdef CONFIG_X86 | |
46 | #include <asm/apic.h> | |
47 | #endif | |
48 | ||
1da177e4 LT |
49 | #include <acpi/acpi_bus.h> |
50 | #include <acpi/processor.h> | |
51 | ||
a192a958 LB |
52 | #define PREFIX "ACPI: " |
53 | ||
1da177e4 | 54 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 55 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 56 | ACPI_MODULE_NAME("processor_idle"); |
1da177e4 | 57 | |
4f86d3a8 LB |
58 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
59 | module_param(max_cstate, uint, 0000); | |
b6835052 | 60 | static unsigned int nocst __read_mostly; |
1da177e4 | 61 | module_param(nocst, uint, 0000); |
d3e7e99f LB |
62 | static int bm_check_disable __read_mostly; |
63 | module_param(bm_check_disable, uint, 0000); | |
1da177e4 | 64 | |
25de5718 | 65 | static unsigned int latency_factor __read_mostly = 2; |
4963f620 | 66 | module_param(latency_factor, uint, 0644); |
1da177e4 | 67 | |
3d339dcb DL |
68 | static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device); |
69 | ||
6240a10d AS |
70 | static DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], |
71 | acpi_cstate); | |
ac3ebafa | 72 | |
d1896049 TR |
73 | static int disabled_by_idle_boot_param(void) |
74 | { | |
75 | return boot_option_idle_override == IDLE_POLL || | |
d1896049 TR |
76 | boot_option_idle_override == IDLE_HALT; |
77 | } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. | |
81 | * For now disable this. Probably a bug somewhere else. | |
82 | * | |
83 | * To skip this limit, boot/load with a large max_cstate limit. | |
84 | */ | |
1855256c | 85 | static int set_max_cstate(const struct dmi_system_id *id) |
1da177e4 LT |
86 | { |
87 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) | |
88 | return 0; | |
89 | ||
3d35600a | 90 | printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate." |
4be44fcd LB |
91 | " Override with \"processor.max_cstate=%d\"\n", id->ident, |
92 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); | |
1da177e4 | 93 | |
3d35600a | 94 | max_cstate = (long)id->driver_data; |
1da177e4 LT |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
fe7bf106 | 99 | static struct dmi_system_id processor_power_dmi_table[] = { |
876c184b TR |
100 | { set_max_cstate, "Clevo 5600D", { |
101 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
102 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, | |
4be44fcd | 103 | (void *)2}, |
370d5cd8 AV |
104 | { set_max_cstate, "Pavilion zv5000", { |
105 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
106 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, | |
107 | (void *)1}, | |
108 | { set_max_cstate, "Asus L8400B", { | |
109 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
110 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, | |
111 | (void *)1}, | |
1da177e4 LT |
112 | {}, |
113 | }; | |
114 | ||
4f86d3a8 | 115 | |
2e906655 | 116 | /* |
117 | * Callers should disable interrupts before the call and enable | |
118 | * interrupts after return. | |
119 | */ | |
ddc081a1 VP |
120 | static void acpi_safe_halt(void) |
121 | { | |
ea811747 | 122 | if (!tif_need_resched()) { |
ddc081a1 | 123 | safe_halt(); |
71e93d15 VP |
124 | local_irq_disable(); |
125 | } | |
ddc081a1 VP |
126 | } |
127 | ||
169a0abb TG |
128 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
129 | ||
130 | /* | |
131 | * Some BIOS implementations switch to C3 in the published C2 state. | |
296d93cd LT |
132 | * This seems to be a common problem on AMD boxen, but other vendors |
133 | * are affected too. We pick the most conservative approach: we assume | |
134 | * that the local APIC stops in both C2 and C3. | |
169a0abb | 135 | */ |
7e275cc4 | 136 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
169a0abb TG |
137 | struct acpi_processor_cx *cx) |
138 | { | |
139 | struct acpi_processor_power *pwr = &pr->power; | |
e585bef8 | 140 | u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; |
169a0abb | 141 | |
db954b58 VP |
142 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
143 | return; | |
144 | ||
02c68a02 | 145 | if (amd_e400_c1e_detected) |
87ad57ba SL |
146 | type = ACPI_STATE_C1; |
147 | ||
169a0abb TG |
148 | /* |
149 | * Check, if one of the previous states already marked the lapic | |
150 | * unstable | |
151 | */ | |
152 | if (pwr->timer_broadcast_on_state < state) | |
153 | return; | |
154 | ||
e585bef8 | 155 | if (cx->type >= type) |
296d93cd | 156 | pr->power.timer_broadcast_on_state = state; |
169a0abb TG |
157 | } |
158 | ||
918aae42 | 159 | static void __lapic_timer_propagate_broadcast(void *arg) |
169a0abb | 160 | { |
f833bab8 | 161 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
e9e2cdb4 TG |
162 | unsigned long reason; |
163 | ||
164 | reason = pr->power.timer_broadcast_on_state < INT_MAX ? | |
165 | CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF; | |
166 | ||
167 | clockevents_notify(reason, &pr->id); | |
e9e2cdb4 TG |
168 | } |
169 | ||
918aae42 HS |
170 | static 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 | ||
e9e2cdb4 | 176 | /* Power(C) State timer broadcast control */ |
7e275cc4 | 177 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, |
e9e2cdb4 TG |
178 | struct acpi_processor_cx *cx, |
179 | int broadcast) | |
180 | { | |
e9e2cdb4 TG |
181 | int state = cx - pr->power.states; |
182 | ||
183 | if (state >= pr->power.timer_broadcast_on_state) { | |
184 | unsigned long reason; | |
185 | ||
186 | reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER : | |
187 | CLOCK_EVT_NOTIFY_BROADCAST_EXIT; | |
188 | clockevents_notify(reason, &pr->id); | |
189 | } | |
169a0abb TG |
190 | } |
191 | ||
192 | #else | |
193 | ||
7e275cc4 | 194 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
169a0abb | 195 | struct acpi_processor_cx *cstate) { } |
7e275cc4 LB |
196 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
197 | static void lapic_timer_state_broadcast(struct acpi_processor *pr, | |
e9e2cdb4 TG |
198 | struct acpi_processor_cx *cx, |
199 | int broadcast) | |
200 | { | |
201 | } | |
169a0abb TG |
202 | |
203 | #endif | |
204 | ||
0a3b15ac | 205 | #ifdef CONFIG_PM_SLEEP |
815ab0fd LB |
206 | static u32 saved_bm_rld; |
207 | ||
95d45d4c | 208 | static int acpi_processor_suspend(void) |
815ab0fd LB |
209 | { |
210 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); | |
0a3b15ac | 211 | return 0; |
815ab0fd | 212 | } |
0a3b15ac | 213 | |
95d45d4c | 214 | static void acpi_processor_resume(void) |
815ab0fd LB |
215 | { |
216 | u32 resumed_bm_rld; | |
217 | ||
218 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); | |
0a3b15ac RW |
219 | if (resumed_bm_rld == saved_bm_rld) |
220 | return; | |
815ab0fd | 221 | |
0a3b15ac | 222 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); |
815ab0fd | 223 | } |
b04e7bdb | 224 | |
0a3b15ac RW |
225 | static struct syscore_ops acpi_processor_syscore_ops = { |
226 | .suspend = acpi_processor_suspend, | |
227 | .resume = acpi_processor_resume, | |
228 | }; | |
229 | ||
230 | void acpi_processor_syscore_init(void) | |
b04e7bdb | 231 | { |
0a3b15ac | 232 | register_syscore_ops(&acpi_processor_syscore_ops); |
b04e7bdb TG |
233 | } |
234 | ||
0a3b15ac | 235 | void acpi_processor_syscore_exit(void) |
b04e7bdb | 236 | { |
0a3b15ac | 237 | unregister_syscore_ops(&acpi_processor_syscore_ops); |
b04e7bdb | 238 | } |
0a3b15ac | 239 | #endif /* CONFIG_PM_SLEEP */ |
b04e7bdb | 240 | |
592913ec | 241 | #if defined(CONFIG_X86) |
520daf72 | 242 | static void tsc_check_state(int state) |
ddb25f9a AK |
243 | { |
244 | switch (boot_cpu_data.x86_vendor) { | |
245 | case X86_VENDOR_AMD: | |
40fb1715 | 246 | case X86_VENDOR_INTEL: |
ddb25f9a AK |
247 | /* |
248 | * AMD Fam10h TSC will tick in all | |
249 | * C/P/S0/S1 states when this bit is set. | |
250 | */ | |
40fb1715 | 251 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
520daf72 | 252 | return; |
40fb1715 | 253 | |
ddb25f9a | 254 | /*FALL THROUGH*/ |
ddb25f9a | 255 | default: |
520daf72 LB |
256 | /* TSC could halt in idle, so notify users */ |
257 | if (state > ACPI_STATE_C1) | |
258 | mark_tsc_unstable("TSC halts in idle"); | |
ddb25f9a AK |
259 | } |
260 | } | |
520daf72 LB |
261 | #else |
262 | static void tsc_check_state(int state) { return; } | |
ddb25f9a AK |
263 | #endif |
264 | ||
4be44fcd | 265 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 266 | { |
1da177e4 LT |
267 | |
268 | if (!pr) | |
d550d98d | 269 | return -EINVAL; |
1da177e4 LT |
270 | |
271 | if (!pr->pblk) | |
d550d98d | 272 | return -ENODEV; |
1da177e4 | 273 | |
1da177e4 | 274 | /* if info is obtained from pblk/fadt, type equals state */ |
1da177e4 LT |
275 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
276 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
277 | ||
4c033552 VP |
278 | #ifndef CONFIG_HOTPLUG_CPU |
279 | /* | |
280 | * Check for P_LVL2_UP flag before entering C2 and above on | |
4f86d3a8 | 281 | * an SMP system. |
4c033552 | 282 | */ |
ad71860a | 283 | if ((num_online_cpus() > 1) && |
cee324b1 | 284 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
d550d98d | 285 | return -ENODEV; |
4c033552 VP |
286 | #endif |
287 | ||
1da177e4 LT |
288 | /* determine C2 and C3 address from pblk */ |
289 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
290 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
291 | ||
292 | /* determine latencies from FADT */ | |
ba494bee BM |
293 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency; |
294 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency; | |
1da177e4 | 295 | |
5d76b6f6 LB |
296 | /* |
297 | * FADT specified C2 latency must be less than or equal to | |
298 | * 100 microseconds. | |
299 | */ | |
ba494bee | 300 | if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
5d76b6f6 | 301 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ba494bee | 302 | "C2 latency too large [%d]\n", acpi_gbl_FADT.c2_latency)); |
5d76b6f6 LB |
303 | /* invalidate C2 */ |
304 | pr->power.states[ACPI_STATE_C2].address = 0; | |
305 | } | |
306 | ||
a6d72c18 LB |
307 | /* |
308 | * FADT supplied C3 latency must be less than or equal to | |
309 | * 1000 microseconds. | |
310 | */ | |
ba494bee | 311 | if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
a6d72c18 | 312 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
ba494bee | 313 | "C3 latency too large [%d]\n", acpi_gbl_FADT.c3_latency)); |
a6d72c18 LB |
314 | /* invalidate C3 */ |
315 | pr->power.states[ACPI_STATE_C3].address = 0; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
319 | "lvl2[0x%08x] lvl3[0x%08x]\n", | |
320 | pr->power.states[ACPI_STATE_C2].address, | |
321 | pr->power.states[ACPI_STATE_C3].address)); | |
322 | ||
d550d98d | 323 | return 0; |
1da177e4 LT |
324 | } |
325 | ||
991528d7 | 326 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
acf05f4b | 327 | { |
991528d7 VP |
328 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
329 | /* set the first C-State to C1 */ | |
330 | /* all processors need to support C1 */ | |
331 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
332 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
0fda6b40 | 333 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
991528d7 VP |
334 | } |
335 | /* the C0 state only exists as a filler in our array */ | |
acf05f4b | 336 | pr->power.states[ACPI_STATE_C0].valid = 1; |
d550d98d | 337 | return 0; |
acf05f4b VP |
338 | } |
339 | ||
4be44fcd | 340 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
1da177e4 | 341 | { |
4be44fcd | 342 | acpi_status status = 0; |
439913ff | 343 | u64 count; |
cf824788 | 344 | int current_count; |
4be44fcd LB |
345 | int i; |
346 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
347 | union acpi_object *cst; | |
1da177e4 | 348 | |
1da177e4 | 349 | |
1da177e4 | 350 | if (nocst) |
d550d98d | 351 | return -ENODEV; |
1da177e4 | 352 | |
991528d7 | 353 | current_count = 0; |
1da177e4 LT |
354 | |
355 | status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer); | |
356 | if (ACPI_FAILURE(status)) { | |
357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n")); | |
d550d98d | 358 | return -ENODEV; |
4be44fcd | 359 | } |
1da177e4 | 360 | |
50dd0969 | 361 | cst = buffer.pointer; |
1da177e4 LT |
362 | |
363 | /* There must be at least 2 elements */ | |
364 | if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) { | |
6468463a | 365 | printk(KERN_ERR PREFIX "not enough elements in _CST\n"); |
1da177e4 LT |
366 | status = -EFAULT; |
367 | goto end; | |
368 | } | |
369 | ||
370 | count = cst->package.elements[0].integer.value; | |
371 | ||
372 | /* Validate number of power states. */ | |
373 | if (count < 1 || count != cst->package.count - 1) { | |
6468463a | 374 | printk(KERN_ERR PREFIX "count given by _CST is not valid\n"); |
1da177e4 LT |
375 | status = -EFAULT; |
376 | goto end; | |
377 | } | |
378 | ||
1da177e4 LT |
379 | /* Tell driver that at least _CST is supported. */ |
380 | pr->flags.has_cst = 1; | |
381 | ||
382 | for (i = 1; i <= count; i++) { | |
383 | union acpi_object *element; | |
384 | union acpi_object *obj; | |
385 | struct acpi_power_register *reg; | |
386 | struct acpi_processor_cx cx; | |
387 | ||
388 | memset(&cx, 0, sizeof(cx)); | |
389 | ||
50dd0969 | 390 | element = &(cst->package.elements[i]); |
1da177e4 LT |
391 | if (element->type != ACPI_TYPE_PACKAGE) |
392 | continue; | |
393 | ||
394 | if (element->package.count != 4) | |
395 | continue; | |
396 | ||
50dd0969 | 397 | obj = &(element->package.elements[0]); |
1da177e4 LT |
398 | |
399 | if (obj->type != ACPI_TYPE_BUFFER) | |
400 | continue; | |
401 | ||
4be44fcd | 402 | reg = (struct acpi_power_register *)obj->buffer.pointer; |
1da177e4 LT |
403 | |
404 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
4be44fcd | 405 | (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) |
1da177e4 LT |
406 | continue; |
407 | ||
1da177e4 | 408 | /* There should be an easy way to extract an integer... */ |
50dd0969 | 409 | obj = &(element->package.elements[1]); |
1da177e4 LT |
410 | if (obj->type != ACPI_TYPE_INTEGER) |
411 | continue; | |
412 | ||
413 | cx.type = obj->integer.value; | |
991528d7 VP |
414 | /* |
415 | * Some buggy BIOSes won't list C1 in _CST - | |
416 | * Let acpi_processor_get_power_info_default() handle them later | |
417 | */ | |
418 | if (i == 1 && cx.type != ACPI_STATE_C1) | |
419 | current_count++; | |
420 | ||
421 | cx.address = reg->address; | |
422 | cx.index = current_count + 1; | |
423 | ||
bc71bec9 | 424 | cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
991528d7 VP |
425 | if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
426 | if (acpi_processor_ffh_cstate_probe | |
427 | (pr->id, &cx, reg) == 0) { | |
bc71bec9 | 428 | cx.entry_method = ACPI_CSTATE_FFH; |
429 | } else if (cx.type == ACPI_STATE_C1) { | |
991528d7 VP |
430 | /* |
431 | * C1 is a special case where FIXED_HARDWARE | |
432 | * can be handled in non-MWAIT way as well. | |
433 | * In that case, save this _CST entry info. | |
991528d7 VP |
434 | * Otherwise, ignore this info and continue. |
435 | */ | |
bc71bec9 | 436 | cx.entry_method = ACPI_CSTATE_HALT; |
4fcb2fcd | 437 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
bc71bec9 | 438 | } else { |
991528d7 VP |
439 | continue; |
440 | } | |
da5e09a1 | 441 | if (cx.type == ACPI_STATE_C1 && |
d1896049 | 442 | (boot_option_idle_override == IDLE_NOMWAIT)) { |
c1e3b377 ZY |
443 | /* |
444 | * In most cases the C1 space_id obtained from | |
445 | * _CST object is FIXED_HARDWARE access mode. | |
446 | * But when the option of idle=halt is added, | |
447 | * the entry_method type should be changed from | |
448 | * CSTATE_FFH to CSTATE_HALT. | |
da5e09a1 ZY |
449 | * When the option of idle=nomwait is added, |
450 | * the C1 entry_method type should be | |
451 | * CSTATE_HALT. | |
c1e3b377 ZY |
452 | */ |
453 | cx.entry_method = ACPI_CSTATE_HALT; | |
454 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); | |
455 | } | |
4fcb2fcd VP |
456 | } else { |
457 | snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", | |
458 | cx.address); | |
991528d7 | 459 | } |
1da177e4 | 460 | |
0fda6b40 VP |
461 | if (cx.type == ACPI_STATE_C1) { |
462 | cx.valid = 1; | |
463 | } | |
4fcb2fcd | 464 | |
50dd0969 | 465 | obj = &(element->package.elements[2]); |
1da177e4 LT |
466 | if (obj->type != ACPI_TYPE_INTEGER) |
467 | continue; | |
468 | ||
469 | cx.latency = obj->integer.value; | |
470 | ||
50dd0969 | 471 | obj = &(element->package.elements[3]); |
1da177e4 LT |
472 | if (obj->type != ACPI_TYPE_INTEGER) |
473 | continue; | |
474 | ||
cf824788 JM |
475 | current_count++; |
476 | memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx)); | |
477 | ||
478 | /* | |
479 | * We support total ACPI_PROCESSOR_MAX_POWER - 1 | |
480 | * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1) | |
481 | */ | |
482 | if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) { | |
483 | printk(KERN_WARNING | |
484 | "Limiting number of power states to max (%d)\n", | |
485 | ACPI_PROCESSOR_MAX_POWER); | |
486 | printk(KERN_WARNING | |
487 | "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
488 | break; | |
489 | } | |
1da177e4 LT |
490 | } |
491 | ||
4be44fcd | 492 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", |
cf824788 | 493 | current_count)); |
1da177e4 LT |
494 | |
495 | /* Validate number of power states discovered */ | |
cf824788 | 496 | if (current_count < 2) |
6d93c648 | 497 | status = -EFAULT; |
1da177e4 | 498 | |
4be44fcd | 499 | end: |
02438d87 | 500 | kfree(buffer.pointer); |
1da177e4 | 501 | |
d550d98d | 502 | return status; |
1da177e4 LT |
503 | } |
504 | ||
4be44fcd LB |
505 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
506 | struct acpi_processor_cx *cx) | |
1da177e4 | 507 | { |
ee1ca48f PV |
508 | static int bm_check_flag = -1; |
509 | static int bm_control_flag = -1; | |
02df8b93 | 510 | |
1da177e4 LT |
511 | |
512 | if (!cx->address) | |
d550d98d | 513 | return; |
1da177e4 | 514 | |
1da177e4 LT |
515 | /* |
516 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
517 | * DMA transfers are used by any ISA device to avoid livelock. | |
518 | * Note that we could disable Type-F DMA (as recommended by | |
519 | * the erratum), but this is known to disrupt certain ISA | |
520 | * devices thus we take the conservative approach. | |
521 | */ | |
522 | else if (errata.piix4.fdma) { | |
523 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 524 | "C3 not supported on PIIX4 with Type-F DMA\n")); |
d550d98d | 525 | return; |
1da177e4 LT |
526 | } |
527 | ||
02df8b93 | 528 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
ee1ca48f | 529 | if (bm_check_flag == -1) { |
02df8b93 VP |
530 | /* Determine whether bm_check is needed based on CPU */ |
531 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
532 | bm_check_flag = pr->flags.bm_check; | |
ee1ca48f | 533 | bm_control_flag = pr->flags.bm_control; |
02df8b93 VP |
534 | } else { |
535 | pr->flags.bm_check = bm_check_flag; | |
ee1ca48f | 536 | pr->flags.bm_control = bm_control_flag; |
02df8b93 VP |
537 | } |
538 | ||
539 | if (pr->flags.bm_check) { | |
02df8b93 | 540 | if (!pr->flags.bm_control) { |
ed3110ef VP |
541 | if (pr->flags.has_cst != 1) { |
542 | /* bus mastering control is necessary */ | |
543 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
544 | "C3 support requires BM control\n")); | |
545 | return; | |
546 | } else { | |
547 | /* Here we enter C3 without bus mastering */ | |
548 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
549 | "C3 support without BM control\n")); | |
550 | } | |
02df8b93 VP |
551 | } |
552 | } else { | |
02df8b93 VP |
553 | /* |
554 | * WBINVD should be set in fadt, for C3 state to be | |
555 | * supported on when bm_check is not required. | |
556 | */ | |
cee324b1 | 557 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
02df8b93 | 558 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
559 | "Cache invalidation should work properly" |
560 | " for C3 to be enabled on SMP systems\n")); | |
d550d98d | 561 | return; |
02df8b93 | 562 | } |
02df8b93 VP |
563 | } |
564 | ||
1da177e4 LT |
565 | /* |
566 | * Otherwise we've met all of our C3 requirements. | |
567 | * Normalize the C3 latency to expidite policy. Enable | |
568 | * checking of bus mastering status (bm_check) so we can | |
569 | * use this in our C3 policy | |
570 | */ | |
571 | cx->valid = 1; | |
4f86d3a8 | 572 | |
31878dd8 LB |
573 | /* |
574 | * On older chipsets, BM_RLD needs to be set | |
575 | * in order for Bus Master activity to wake the | |
576 | * system from C3. Newer chipsets handle DMA | |
577 | * during C3 automatically and BM_RLD is a NOP. | |
578 | * In either case, the proper way to | |
579 | * handle BM_RLD is to set it and leave it set. | |
580 | */ | |
50ffba1b | 581 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
1da177e4 | 582 | |
d550d98d | 583 | return; |
1da177e4 LT |
584 | } |
585 | ||
1da177e4 LT |
586 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
587 | { | |
588 | unsigned int i; | |
589 | unsigned int working = 0; | |
6eb0a0fd | 590 | |
169a0abb | 591 | pr->power.timer_broadcast_on_state = INT_MAX; |
6eb0a0fd | 592 | |
a0bf284b | 593 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
1da177e4 LT |
594 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
595 | ||
596 | switch (cx->type) { | |
597 | case ACPI_STATE_C1: | |
598 | cx->valid = 1; | |
599 | break; | |
600 | ||
601 | case ACPI_STATE_C2: | |
d22edd29 LB |
602 | if (!cx->address) |
603 | break; | |
604 | cx->valid = 1; | |
1da177e4 LT |
605 | break; |
606 | ||
607 | case ACPI_STATE_C3: | |
608 | acpi_processor_power_verify_c3(pr, cx); | |
609 | break; | |
610 | } | |
7e275cc4 LB |
611 | if (!cx->valid) |
612 | continue; | |
1da177e4 | 613 | |
7e275cc4 LB |
614 | lapic_timer_check_state(i, pr, cx); |
615 | tsc_check_state(cx->type); | |
616 | working++; | |
1da177e4 | 617 | } |
bd663347 | 618 | |
918aae42 | 619 | lapic_timer_propagate_broadcast(pr); |
1da177e4 LT |
620 | |
621 | return (working); | |
622 | } | |
623 | ||
4be44fcd | 624 | static int acpi_processor_get_power_info(struct acpi_processor *pr) |
1da177e4 LT |
625 | { |
626 | unsigned int i; | |
627 | int result; | |
628 | ||
1da177e4 LT |
629 | |
630 | /* NOTE: the idle thread may not be running while calling | |
631 | * this function */ | |
632 | ||
991528d7 VP |
633 | /* Zero initialize all the C-states info. */ |
634 | memset(pr->power.states, 0, sizeof(pr->power.states)); | |
635 | ||
1da177e4 | 636 | result = acpi_processor_get_power_info_cst(pr); |
6d93c648 | 637 | if (result == -ENODEV) |
c5a114f1 | 638 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 | 639 | |
991528d7 VP |
640 | if (result) |
641 | return result; | |
642 | ||
643 | acpi_processor_get_power_info_default(pr); | |
644 | ||
cf824788 | 645 | pr->power.count = acpi_processor_power_verify(pr); |
1da177e4 | 646 | |
1da177e4 LT |
647 | /* |
648 | * if one state of type C2 or C3 is available, mark this | |
649 | * CPU as being "idle manageable" | |
650 | */ | |
651 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 652 | if (pr->power.states[i].valid) { |
1da177e4 | 653 | pr->power.count = i; |
2203d6ed LT |
654 | if (pr->power.states[i].type >= ACPI_STATE_C2) |
655 | pr->flags.power = 1; | |
acf05f4b | 656 | } |
1da177e4 LT |
657 | } |
658 | ||
d550d98d | 659 | return 0; |
1da177e4 LT |
660 | } |
661 | ||
4f86d3a8 LB |
662 | /** |
663 | * acpi_idle_bm_check - checks if bus master activity was detected | |
664 | */ | |
665 | static int acpi_idle_bm_check(void) | |
666 | { | |
667 | u32 bm_status = 0; | |
668 | ||
d3e7e99f LB |
669 | if (bm_check_disable) |
670 | return 0; | |
671 | ||
50ffba1b | 672 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
4f86d3a8 | 673 | if (bm_status) |
50ffba1b | 674 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
4f86d3a8 LB |
675 | /* |
676 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
677 | * the true state of bus mastering activity; forcing us to | |
678 | * manually check the BMIDEA bit of each IDE channel. | |
679 | */ | |
680 | else if (errata.piix4.bmisx) { | |
681 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
682 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) | |
683 | bm_status = 1; | |
684 | } | |
685 | return bm_status; | |
686 | } | |
687 | ||
4f86d3a8 LB |
688 | /** |
689 | * acpi_idle_do_entry - a helper function that does C2 and C3 type entry | |
690 | * @cx: cstate data | |
bc71bec9 | 691 | * |
692 | * Caller disables interrupt before call and enables interrupt after return. | |
4f86d3a8 LB |
693 | */ |
694 | static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx) | |
695 | { | |
dcf30997 SR |
696 | /* Don't trace irqs off for idle */ |
697 | stop_critical_timings(); | |
bc71bec9 | 698 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
4f86d3a8 LB |
699 | /* Call into architectural FFH based C-state */ |
700 | acpi_processor_ffh_cstate_enter(cx); | |
bc71bec9 | 701 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
702 | acpi_safe_halt(); | |
4f86d3a8 | 703 | } else { |
4f86d3a8 LB |
704 | /* IO port based C-state */ |
705 | inb(cx->address); | |
706 | /* Dummy wait op - must do something useless after P_LVL2 read | |
707 | because chipsets cannot guarantee that STPCLK# signal | |
708 | gets asserted in time to freeze execution properly. */ | |
cfa806f0 | 709 | inl(acpi_gbl_FADT.xpm_timer_block.address); |
4f86d3a8 | 710 | } |
dcf30997 | 711 | start_critical_timings(); |
4f86d3a8 LB |
712 | } |
713 | ||
714 | /** | |
715 | * acpi_idle_enter_c1 - enters an ACPI C1 state-type | |
716 | * @dev: the target CPU | |
46bcfad7 | 717 | * @drv: cpuidle driver containing cpuidle state info |
e978aa7d | 718 | * @index: index of target state |
4f86d3a8 LB |
719 | * |
720 | * This is equivalent to the HALT instruction. | |
721 | */ | |
722 | static int acpi_idle_enter_c1(struct cpuidle_device *dev, | |
46bcfad7 | 723 | struct cpuidle_driver *drv, int index) |
4f86d3a8 LB |
724 | { |
725 | struct acpi_processor *pr; | |
6240a10d | 726 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); |
9b12e18c | 727 | |
4a6f4fe8 | 728 | pr = __this_cpu_read(processors); |
4f86d3a8 LB |
729 | |
730 | if (unlikely(!pr)) | |
e978aa7d | 731 | return -EINVAL; |
4f86d3a8 | 732 | |
ea811747 PZ |
733 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
734 | if (current_set_polling_and_test()) | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
7e275cc4 | 738 | lapic_timer_state_broadcast(pr, cx, 1); |
bc71bec9 | 739 | acpi_idle_do_entry(cx); |
e978aa7d | 740 | |
7e275cc4 | 741 | lapic_timer_state_broadcast(pr, cx, 0); |
4f86d3a8 | 742 | |
e978aa7d | 743 | return index; |
4f86d3a8 LB |
744 | } |
745 | ||
1a022e3f BO |
746 | |
747 | /** | |
748 | * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) | |
749 | * @dev: the target CPU | |
750 | * @index: the index of suggested state | |
751 | */ | |
752 | static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) | |
753 | { | |
6240a10d | 754 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); |
1a022e3f BO |
755 | |
756 | ACPI_FLUSH_CPU_CACHE(); | |
757 | ||
758 | while (1) { | |
759 | ||
760 | if (cx->entry_method == ACPI_CSTATE_HALT) | |
54f70077 | 761 | safe_halt(); |
1a022e3f BO |
762 | else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { |
763 | inb(cx->address); | |
764 | /* See comment in acpi_idle_do_entry() */ | |
765 | inl(acpi_gbl_FADT.xpm_timer_block.address); | |
766 | } else | |
767 | return -ENODEV; | |
768 | } | |
769 | ||
770 | /* Never reached */ | |
771 | return 0; | |
772 | } | |
773 | ||
4f86d3a8 LB |
774 | /** |
775 | * acpi_idle_enter_simple - enters an ACPI state without BM handling | |
776 | * @dev: the target CPU | |
46bcfad7 | 777 | * @drv: cpuidle driver with cpuidle state information |
e978aa7d | 778 | * @index: the index of suggested state |
4f86d3a8 LB |
779 | */ |
780 | static int acpi_idle_enter_simple(struct cpuidle_device *dev, | |
46bcfad7 | 781 | struct cpuidle_driver *drv, int index) |
4f86d3a8 LB |
782 | { |
783 | struct acpi_processor *pr; | |
6240a10d | 784 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); |
50629118 | 785 | |
4a6f4fe8 | 786 | pr = __this_cpu_read(processors); |
4f86d3a8 LB |
787 | |
788 | if (unlikely(!pr)) | |
e978aa7d | 789 | return -EINVAL; |
e196441b | 790 | |
ea811747 PZ |
791 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
792 | if (current_set_polling_and_test()) | |
e978aa7d | 793 | return -EINVAL; |
4f86d3a8 LB |
794 | } |
795 | ||
e17bcb43 TG |
796 | /* |
797 | * Must be done before busmaster disable as we might need to | |
798 | * access HPET ! | |
799 | */ | |
7e275cc4 | 800 | lapic_timer_state_broadcast(pr, cx, 1); |
e17bcb43 | 801 | |
4f86d3a8 LB |
802 | if (cx->type == ACPI_STATE_C3) |
803 | ACPI_FLUSH_CPU_CACHE(); | |
804 | ||
50629118 VP |
805 | /* Tell the scheduler that we are going deep-idle: */ |
806 | sched_clock_idle_sleep_event(); | |
4f86d3a8 | 807 | acpi_idle_do_entry(cx); |
4f86d3a8 | 808 | |
a474a515 | 809 | sched_clock_idle_wakeup_event(0); |
e978aa7d | 810 | |
7e275cc4 | 811 | lapic_timer_state_broadcast(pr, cx, 0); |
e978aa7d | 812 | return index; |
4f86d3a8 LB |
813 | } |
814 | ||
815 | static int c3_cpu_count; | |
e12f65f7 | 816 | static DEFINE_RAW_SPINLOCK(c3_lock); |
4f86d3a8 LB |
817 | |
818 | /** | |
819 | * acpi_idle_enter_bm - enters C3 with proper BM handling | |
820 | * @dev: the target CPU | |
46bcfad7 | 821 | * @drv: cpuidle driver containing state data |
e978aa7d | 822 | * @index: the index of suggested state |
4f86d3a8 LB |
823 | * |
824 | * If BM is detected, the deepest non-C3 idle state is entered instead. | |
825 | */ | |
826 | static int acpi_idle_enter_bm(struct cpuidle_device *dev, | |
46bcfad7 | 827 | struct cpuidle_driver *drv, int index) |
4f86d3a8 LB |
828 | { |
829 | struct acpi_processor *pr; | |
6240a10d | 830 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); |
50629118 | 831 | |
4a6f4fe8 | 832 | pr = __this_cpu_read(processors); |
4f86d3a8 LB |
833 | |
834 | if (unlikely(!pr)) | |
e978aa7d | 835 | return -EINVAL; |
4f86d3a8 | 836 | |
718be4aa | 837 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { |
46bcfad7 DD |
838 | if (drv->safe_state_index >= 0) { |
839 | return drv->states[drv->safe_state_index].enter(dev, | |
840 | drv, drv->safe_state_index); | |
ddc081a1 | 841 | } else { |
8651f97b | 842 | acpi_safe_halt(); |
75cc5235 | 843 | return -EBUSY; |
ddc081a1 VP |
844 | } |
845 | } | |
846 | ||
ea811747 PZ |
847 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
848 | if (current_set_polling_and_test()) | |
e978aa7d | 849 | return -EINVAL; |
4f86d3a8 LB |
850 | } |
851 | ||
996520c1 VP |
852 | acpi_unlazy_tlb(smp_processor_id()); |
853 | ||
50629118 VP |
854 | /* Tell the scheduler that we are going deep-idle: */ |
855 | sched_clock_idle_sleep_event(); | |
4f86d3a8 LB |
856 | /* |
857 | * Must be done before busmaster disable as we might need to | |
858 | * access HPET ! | |
859 | */ | |
7e275cc4 | 860 | lapic_timer_state_broadcast(pr, cx, 1); |
4f86d3a8 | 861 | |
ddc081a1 VP |
862 | /* |
863 | * disable bus master | |
864 | * bm_check implies we need ARB_DIS | |
865 | * !bm_check implies we need cache flush | |
866 | * bm_control implies whether we can do ARB_DIS | |
867 | * | |
868 | * That leaves a case where bm_check is set and bm_control is | |
869 | * not set. In that case we cannot do much, we enter C3 | |
870 | * without doing anything. | |
871 | */ | |
872 | if (pr->flags.bm_check && pr->flags.bm_control) { | |
e12f65f7 | 873 | raw_spin_lock(&c3_lock); |
4f86d3a8 LB |
874 | c3_cpu_count++; |
875 | /* Disable bus master arbitration when all CPUs are in C3 */ | |
876 | if (c3_cpu_count == num_online_cpus()) | |
50ffba1b | 877 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
e12f65f7 | 878 | raw_spin_unlock(&c3_lock); |
ddc081a1 VP |
879 | } else if (!pr->flags.bm_check) { |
880 | ACPI_FLUSH_CPU_CACHE(); | |
881 | } | |
4f86d3a8 | 882 | |
ddc081a1 | 883 | acpi_idle_do_entry(cx); |
4f86d3a8 | 884 | |
ddc081a1 VP |
885 | /* Re-enable bus master arbitration */ |
886 | if (pr->flags.bm_check && pr->flags.bm_control) { | |
e12f65f7 | 887 | raw_spin_lock(&c3_lock); |
50ffba1b | 888 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
4f86d3a8 | 889 | c3_cpu_count--; |
e12f65f7 | 890 | raw_spin_unlock(&c3_lock); |
4f86d3a8 | 891 | } |
e978aa7d | 892 | |
a474a515 | 893 | sched_clock_idle_wakeup_event(0); |
4f86d3a8 | 894 | |
7e275cc4 | 895 | lapic_timer_state_broadcast(pr, cx, 0); |
e978aa7d | 896 | return index; |
4f86d3a8 LB |
897 | } |
898 | ||
899 | struct cpuidle_driver acpi_idle_driver = { | |
900 | .name = "acpi_idle", | |
901 | .owner = THIS_MODULE, | |
902 | }; | |
903 | ||
904 | /** | |
46bcfad7 DD |
905 | * acpi_processor_setup_cpuidle_cx - prepares and configures CPUIDLE |
906 | * device i.e. per-cpu data | |
907 | * | |
4f86d3a8 | 908 | * @pr: the ACPI processor |
6ef0f086 | 909 | * @dev : the cpuidle device |
4f86d3a8 | 910 | */ |
6ef0f086 DL |
911 | static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, |
912 | struct cpuidle_device *dev) | |
4f86d3a8 | 913 | { |
9a0b8415 | 914 | int i, count = CPUIDLE_DRIVER_STATE_START; |
4f86d3a8 | 915 | struct acpi_processor_cx *cx; |
4f86d3a8 LB |
916 | |
917 | if (!pr->flags.power_setup_done) | |
918 | return -EINVAL; | |
919 | ||
920 | if (pr->flags.power == 0) { | |
921 | return -EINVAL; | |
922 | } | |
923 | ||
b88a634a KRW |
924 | if (!dev) |
925 | return -EINVAL; | |
926 | ||
dcb84f33 | 927 | dev->cpu = pr->id; |
4fcb2fcd | 928 | |
615dfd93 LB |
929 | if (max_cstate == 0) |
930 | max_cstate = 1; | |
931 | ||
4f86d3a8 LB |
932 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
933 | cx = &pr->power.states[i]; | |
4f86d3a8 LB |
934 | |
935 | if (!cx->valid) | |
936 | continue; | |
937 | ||
938 | #ifdef CONFIG_HOTPLUG_CPU | |
939 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
940 | !pr->flags.has_cst && | |
941 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) | |
942 | continue; | |
1fec74a9 | 943 | #endif |
6240a10d | 944 | per_cpu(acpi_cstate[count], dev->cpu) = cx; |
4f86d3a8 | 945 | |
46bcfad7 DD |
946 | count++; |
947 | if (count == CPUIDLE_STATE_MAX) | |
948 | break; | |
949 | } | |
950 | ||
951 | dev->state_count = count; | |
952 | ||
953 | if (!count) | |
954 | return -EINVAL; | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | /** | |
960 | * acpi_processor_setup_cpuidle states- prepares and configures cpuidle | |
961 | * global state data i.e. idle routines | |
962 | * | |
963 | * @pr: the ACPI processor | |
964 | */ | |
965 | static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) | |
966 | { | |
967 | int i, count = CPUIDLE_DRIVER_STATE_START; | |
968 | struct acpi_processor_cx *cx; | |
969 | struct cpuidle_state *state; | |
970 | struct cpuidle_driver *drv = &acpi_idle_driver; | |
971 | ||
972 | if (!pr->flags.power_setup_done) | |
973 | return -EINVAL; | |
974 | ||
975 | if (pr->flags.power == 0) | |
976 | return -EINVAL; | |
977 | ||
978 | drv->safe_state_index = -1; | |
4fcb2fcd | 979 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
46bcfad7 DD |
980 | drv->states[i].name[0] = '\0'; |
981 | drv->states[i].desc[0] = '\0'; | |
4fcb2fcd VP |
982 | } |
983 | ||
615dfd93 LB |
984 | if (max_cstate == 0) |
985 | max_cstate = 1; | |
986 | ||
4f86d3a8 LB |
987 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
988 | cx = &pr->power.states[i]; | |
4f86d3a8 LB |
989 | |
990 | if (!cx->valid) | |
991 | continue; | |
992 | ||
993 | #ifdef CONFIG_HOTPLUG_CPU | |
994 | if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && | |
995 | !pr->flags.has_cst && | |
996 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) | |
997 | continue; | |
1fec74a9 | 998 | #endif |
4f86d3a8 | 999 | |
46bcfad7 | 1000 | state = &drv->states[count]; |
4f86d3a8 | 1001 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
4fcb2fcd | 1002 | strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
4f86d3a8 | 1003 | state->exit_latency = cx->latency; |
4963f620 | 1004 | state->target_residency = cx->latency * latency_factor; |
4f86d3a8 LB |
1005 | |
1006 | state->flags = 0; | |
1007 | switch (cx->type) { | |
1008 | case ACPI_STATE_C1: | |
8e92b660 VP |
1009 | if (cx->entry_method == ACPI_CSTATE_FFH) |
1010 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
1011 | ||
4f86d3a8 | 1012 | state->enter = acpi_idle_enter_c1; |
1a022e3f | 1013 | state->enter_dead = acpi_idle_play_dead; |
46bcfad7 | 1014 | drv->safe_state_index = count; |
4f86d3a8 LB |
1015 | break; |
1016 | ||
1017 | case ACPI_STATE_C2: | |
4f86d3a8 LB |
1018 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
1019 | state->enter = acpi_idle_enter_simple; | |
1a022e3f | 1020 | state->enter_dead = acpi_idle_play_dead; |
46bcfad7 | 1021 | drv->safe_state_index = count; |
4f86d3a8 LB |
1022 | break; |
1023 | ||
1024 | case ACPI_STATE_C3: | |
4f86d3a8 | 1025 | state->flags |= CPUIDLE_FLAG_TIME_VALID; |
4f86d3a8 LB |
1026 | state->enter = pr->flags.bm_check ? |
1027 | acpi_idle_enter_bm : | |
1028 | acpi_idle_enter_simple; | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | count++; | |
9a0b8415 | 1033 | if (count == CPUIDLE_STATE_MAX) |
1034 | break; | |
4f86d3a8 LB |
1035 | } |
1036 | ||
46bcfad7 | 1037 | drv->state_count = count; |
4f86d3a8 LB |
1038 | |
1039 | if (!count) | |
1040 | return -EINVAL; | |
1041 | ||
4f86d3a8 LB |
1042 | return 0; |
1043 | } | |
1044 | ||
46bcfad7 | 1045 | int acpi_processor_hotplug(struct acpi_processor *pr) |
4f86d3a8 | 1046 | { |
dcb84f33 | 1047 | int ret = 0; |
e8b1b59d | 1048 | struct cpuidle_device *dev; |
4f86d3a8 | 1049 | |
d1896049 | 1050 | if (disabled_by_idle_boot_param()) |
36a91358 VP |
1051 | return 0; |
1052 | ||
4f86d3a8 LB |
1053 | if (!pr) |
1054 | return -EINVAL; | |
1055 | ||
1056 | if (nocst) { | |
1057 | return -ENODEV; | |
1058 | } | |
1059 | ||
1060 | if (!pr->flags.power_setup_done) | |
1061 | return -ENODEV; | |
1062 | ||
e8b1b59d | 1063 | dev = per_cpu(acpi_cpuidle_device, pr->id); |
4f86d3a8 | 1064 | cpuidle_pause_and_lock(); |
3d339dcb | 1065 | cpuidle_disable_device(dev); |
4f86d3a8 | 1066 | acpi_processor_get_power_info(pr); |
dcb84f33 | 1067 | if (pr->flags.power) { |
6ef0f086 | 1068 | acpi_processor_setup_cpuidle_cx(pr, dev); |
3d339dcb | 1069 | ret = cpuidle_enable_device(dev); |
dcb84f33 | 1070 | } |
4f86d3a8 LB |
1071 | cpuidle_resume_and_unlock(); |
1072 | ||
1073 | return ret; | |
1074 | } | |
1075 | ||
46bcfad7 DD |
1076 | int acpi_processor_cst_has_changed(struct acpi_processor *pr) |
1077 | { | |
1078 | int cpu; | |
1079 | struct acpi_processor *_pr; | |
3d339dcb | 1080 | struct cpuidle_device *dev; |
46bcfad7 DD |
1081 | |
1082 | if (disabled_by_idle_boot_param()) | |
1083 | return 0; | |
1084 | ||
1085 | if (!pr) | |
1086 | return -EINVAL; | |
1087 | ||
1088 | if (nocst) | |
1089 | return -ENODEV; | |
1090 | ||
1091 | if (!pr->flags.power_setup_done) | |
1092 | return -ENODEV; | |
1093 | ||
1094 | /* | |
1095 | * FIXME: Design the ACPI notification to make it once per | |
1096 | * system instead of once per-cpu. This condition is a hack | |
1097 | * to make the code that updates C-States be called once. | |
1098 | */ | |
1099 | ||
9505626d | 1100 | if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { |
46bcfad7 DD |
1101 | |
1102 | cpuidle_pause_and_lock(); | |
1103 | /* Protect against cpu-hotplug */ | |
1104 | get_online_cpus(); | |
1105 | ||
1106 | /* Disable all cpuidle devices */ | |
1107 | for_each_online_cpu(cpu) { | |
1108 | _pr = per_cpu(processors, cpu); | |
1109 | if (!_pr || !_pr->flags.power_setup_done) | |
1110 | continue; | |
3d339dcb DL |
1111 | dev = per_cpu(acpi_cpuidle_device, cpu); |
1112 | cpuidle_disable_device(dev); | |
46bcfad7 DD |
1113 | } |
1114 | ||
1115 | /* Populate Updated C-state information */ | |
f427e5f1 | 1116 | acpi_processor_get_power_info(pr); |
46bcfad7 DD |
1117 | acpi_processor_setup_cpuidle_states(pr); |
1118 | ||
1119 | /* Enable all cpuidle devices */ | |
1120 | for_each_online_cpu(cpu) { | |
1121 | _pr = per_cpu(processors, cpu); | |
1122 | if (!_pr || !_pr->flags.power_setup_done) | |
1123 | continue; | |
1124 | acpi_processor_get_power_info(_pr); | |
1125 | if (_pr->flags.power) { | |
3d339dcb | 1126 | dev = per_cpu(acpi_cpuidle_device, cpu); |
6ef0f086 | 1127 | acpi_processor_setup_cpuidle_cx(_pr, dev); |
3d339dcb | 1128 | cpuidle_enable_device(dev); |
46bcfad7 DD |
1129 | } |
1130 | } | |
1131 | put_online_cpus(); | |
1132 | cpuidle_resume_and_unlock(); | |
1133 | } | |
1134 | ||
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static int acpi_processor_registered; | |
1139 | ||
fe7bf106 | 1140 | int acpi_processor_power_init(struct acpi_processor *pr) |
1da177e4 | 1141 | { |
4be44fcd | 1142 | acpi_status status = 0; |
46bcfad7 | 1143 | int retval; |
3d339dcb | 1144 | struct cpuidle_device *dev; |
b6835052 | 1145 | static int first_run; |
1da177e4 | 1146 | |
d1896049 | 1147 | if (disabled_by_idle_boot_param()) |
36a91358 | 1148 | return 0; |
1da177e4 LT |
1149 | |
1150 | if (!first_run) { | |
1151 | dmi_check_system(processor_power_dmi_table); | |
c1c30634 | 1152 | max_cstate = acpi_processor_cstate_check(max_cstate); |
1da177e4 | 1153 | if (max_cstate < ACPI_C_STATES_MAX) |
4be44fcd LB |
1154 | printk(KERN_NOTICE |
1155 | "ACPI: processor limited to max C-state %d\n", | |
1156 | max_cstate); | |
1da177e4 LT |
1157 | first_run++; |
1158 | } | |
1159 | ||
02df8b93 | 1160 | if (!pr) |
d550d98d | 1161 | return -EINVAL; |
02df8b93 | 1162 | |
cee324b1 | 1163 | if (acpi_gbl_FADT.cst_control && !nocst) { |
4be44fcd | 1164 | status = |
cee324b1 | 1165 | acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); |
1da177e4 | 1166 | if (ACPI_FAILURE(status)) { |
a6fc6720 TR |
1167 | ACPI_EXCEPTION((AE_INFO, status, |
1168 | "Notifying BIOS of _CST ability failed")); | |
1da177e4 LT |
1169 | } |
1170 | } | |
1171 | ||
1172 | acpi_processor_get_power_info(pr); | |
4f86d3a8 | 1173 | pr->flags.power_setup_done = 1; |
1da177e4 LT |
1174 | |
1175 | /* | |
1176 | * Install the idle handler if processor power management is supported. | |
1177 | * Note that we use previously set idle handler will be used on | |
1178 | * platforms that only support C1. | |
1179 | */ | |
36a91358 | 1180 | if (pr->flags.power) { |
46bcfad7 DD |
1181 | /* Register acpi_idle_driver if not already registered */ |
1182 | if (!acpi_processor_registered) { | |
1183 | acpi_processor_setup_cpuidle_states(pr); | |
1184 | retval = cpuidle_register_driver(&acpi_idle_driver); | |
1185 | if (retval) | |
1186 | return retval; | |
1187 | printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", | |
1188 | acpi_idle_driver.name); | |
1189 | } | |
3d339dcb DL |
1190 | |
1191 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1192 | if (!dev) | |
1193 | return -ENOMEM; | |
1194 | per_cpu(acpi_cpuidle_device, pr->id) = dev; | |
1195 | ||
6ef0f086 | 1196 | acpi_processor_setup_cpuidle_cx(pr, dev); |
3d339dcb | 1197 | |
46bcfad7 DD |
1198 | /* Register per-cpu cpuidle_device. Cpuidle driver |
1199 | * must already be registered before registering device | |
1200 | */ | |
3d339dcb | 1201 | retval = cpuidle_register_device(dev); |
46bcfad7 DD |
1202 | if (retval) { |
1203 | if (acpi_processor_registered == 0) | |
1204 | cpuidle_unregister_driver(&acpi_idle_driver); | |
1205 | return retval; | |
1206 | } | |
1207 | acpi_processor_registered++; | |
1da177e4 | 1208 | } |
d550d98d | 1209 | return 0; |
1da177e4 LT |
1210 | } |
1211 | ||
38a991b6 | 1212 | int acpi_processor_power_exit(struct acpi_processor *pr) |
1da177e4 | 1213 | { |
3d339dcb DL |
1214 | struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); |
1215 | ||
d1896049 | 1216 | if (disabled_by_idle_boot_param()) |
36a91358 VP |
1217 | return 0; |
1218 | ||
46bcfad7 | 1219 | if (pr->flags.power) { |
3d339dcb | 1220 | cpuidle_unregister_device(dev); |
46bcfad7 DD |
1221 | acpi_processor_registered--; |
1222 | if (acpi_processor_registered == 0) | |
1223 | cpuidle_unregister_driver(&acpi_idle_driver); | |
1224 | } | |
1da177e4 | 1225 | |
46bcfad7 | 1226 | pr->flags.power_setup_done = 0; |
d550d98d | 1227 | return 0; |
1da177e4 | 1228 | } |