Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * processor_idle - idle state submodule to the ACPI processor driver | |
4 | * | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
c5ab81ca | 7 | * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de> |
1da177e4 LT |
8 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
9 | * - Added processor hotplug support | |
02df8b93 VP |
10 | * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> |
11 | * - Added support for C3 on SMP | |
1da177e4 | 12 | */ |
b6ec26fb | 13 | #define pr_fmt(fmt) "ACPI: " fmt |
1da177e4 | 14 | |
1da177e4 | 15 | #include <linux/module.h> |
1da177e4 LT |
16 | #include <linux/acpi.h> |
17 | #include <linux/dmi.h> | |
e2668fb5 | 18 | #include <linux/sched.h> /* need_resched() */ |
65ea8f2c | 19 | #include <linux/sort.h> |
ee41eebf | 20 | #include <linux/tick.h> |
4f86d3a8 | 21 | #include <linux/cpuidle.h> |
6727ad9e | 22 | #include <linux/cpu.h> |
0e6078c3 | 23 | #include <linux/minmax.h> |
2a606a18 | 24 | #include <linux/perf_event.h> |
8b48463f | 25 | #include <acpi/processor.h> |
e67198cc | 26 | #include <linux/context_tracking.h> |
1da177e4 | 27 | |
3434933b TG |
28 | /* |
29 | * Include the apic definitions for x86 to have the APIC timer related defines | |
30 | * available also for UP (on SMP it gets magically included via linux/smp.h). | |
31 | * asm/acpi.h is not an option, as it would require more include magic. Also | |
32 | * creating an empty asm-ia64/apic.h would just trade pest vs. cholera. | |
33 | */ | |
34 | #ifdef CONFIG_X86 | |
35 | #include <asm/apic.h> | |
8cdddd18 | 36 | #include <asm/cpu.h> |
3434933b TG |
37 | #endif |
38 | ||
dc2251bf RW |
39 | #define ACPI_IDLE_STATE_START (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0) |
40 | ||
4f86d3a8 | 41 | static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; |
27263b34 YD |
42 | module_param(max_cstate, uint, 0400); |
43 | static bool nocst __read_mostly; | |
44 | module_param(nocst, bool, 0400); | |
45 | static bool bm_check_disable __read_mostly; | |
46 | module_param(bm_check_disable, bool, 0400); | |
1da177e4 | 47 | |
25de5718 | 48 | static unsigned int latency_factor __read_mostly = 2; |
4963f620 | 49 | module_param(latency_factor, uint, 0644); |
1da177e4 | 50 | |
3d339dcb DL |
51 | static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device); |
52 | ||
35ae7133 SH |
53 | struct cpuidle_driver acpi_idle_driver = { |
54 | .name = "acpi_idle", | |
55 | .owner = THIS_MODULE, | |
56 | }; | |
57 | ||
58 | #ifdef CONFIG_ACPI_PROCESSOR_CSTATE | |
25528213 PZ |
59 | static |
60 | DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], acpi_cstate); | |
ac3ebafa | 61 | |
d1896049 TR |
62 | static int disabled_by_idle_boot_param(void) |
63 | { | |
64 | return boot_option_idle_override == IDLE_POLL || | |
d1896049 TR |
65 | boot_option_idle_override == IDLE_HALT; |
66 | } | |
67 | ||
1da177e4 LT |
68 | /* |
69 | * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. | |
70 | * For now disable this. Probably a bug somewhere else. | |
71 | * | |
72 | * To skip this limit, boot/load with a large max_cstate limit. | |
73 | */ | |
1855256c | 74 | static int set_max_cstate(const struct dmi_system_id *id) |
1da177e4 LT |
75 | { |
76 | if (max_cstate > ACPI_PROCESSOR_MAX_POWER) | |
77 | return 0; | |
78 | ||
b6ec26fb SH |
79 | pr_notice("%s detected - limiting to C%ld max_cstate." |
80 | " Override with \"processor.max_cstate=%d\"\n", id->ident, | |
81 | (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1); | |
1da177e4 | 82 | |
3d35600a | 83 | max_cstate = (long)id->driver_data; |
1da177e4 LT |
84 | |
85 | return 0; | |
86 | } | |
87 | ||
b0346688 | 88 | static const struct dmi_system_id processor_power_dmi_table[] = { |
876c184b TR |
89 | { set_max_cstate, "Clevo 5600D", { |
90 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), | |
91 | DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, | |
4be44fcd | 92 | (void *)2}, |
370d5cd8 AV |
93 | { set_max_cstate, "Pavilion zv5000", { |
94 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
95 | DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, | |
96 | (void *)1}, | |
97 | { set_max_cstate, "Asus L8400B", { | |
98 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
99 | DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, | |
100 | (void *)1}, | |
1da177e4 LT |
101 | {}, |
102 | }; | |
103 | ||
4f86d3a8 | 104 | |
2e906655 | 105 | /* |
106 | * Callers should disable interrupts before the call and enable | |
107 | * interrupts after return. | |
108 | */ | |
6727ad9e | 109 | static void __cpuidle acpi_safe_halt(void) |
ddc081a1 | 110 | { |
ea811747 | 111 | if (!tif_need_resched()) { |
ddc081a1 | 112 | safe_halt(); |
71e93d15 VP |
113 | local_irq_disable(); |
114 | } | |
ddc081a1 VP |
115 | } |
116 | ||
169a0abb TG |
117 | #ifdef ARCH_APICTIMER_STOPS_ON_C3 |
118 | ||
119 | /* | |
120 | * Some BIOS implementations switch to C3 in the published C2 state. | |
296d93cd LT |
121 | * This seems to be a common problem on AMD boxen, but other vendors |
122 | * are affected too. We pick the most conservative approach: we assume | |
123 | * that the local APIC stops in both C2 and C3. | |
169a0abb | 124 | */ |
7e275cc4 | 125 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
169a0abb TG |
126 | struct acpi_processor_cx *cx) |
127 | { | |
128 | struct acpi_processor_power *pwr = &pr->power; | |
e585bef8 | 129 | u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2; |
169a0abb | 130 | |
db954b58 VP |
131 | if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT)) |
132 | return; | |
133 | ||
07c94a38 | 134 | if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E)) |
87ad57ba SL |
135 | type = ACPI_STATE_C1; |
136 | ||
169a0abb TG |
137 | /* |
138 | * Check, if one of the previous states already marked the lapic | |
139 | * unstable | |
140 | */ | |
141 | if (pwr->timer_broadcast_on_state < state) | |
142 | return; | |
143 | ||
e585bef8 | 144 | if (cx->type >= type) |
296d93cd | 145 | pr->power.timer_broadcast_on_state = state; |
169a0abb TG |
146 | } |
147 | ||
918aae42 | 148 | static void __lapic_timer_propagate_broadcast(void *arg) |
169a0abb | 149 | { |
f833bab8 | 150 | struct acpi_processor *pr = (struct acpi_processor *) arg; |
e9e2cdb4 | 151 | |
ee41eebf TG |
152 | if (pr->power.timer_broadcast_on_state < INT_MAX) |
153 | tick_broadcast_enable(); | |
154 | else | |
155 | tick_broadcast_disable(); | |
e9e2cdb4 TG |
156 | } |
157 | ||
918aae42 HS |
158 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) |
159 | { | |
160 | smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast, | |
161 | (void *)pr, 1); | |
162 | } | |
163 | ||
e9e2cdb4 | 164 | /* Power(C) State timer broadcast control */ |
aa6b43d5 PZ |
165 | static bool lapic_timer_needs_broadcast(struct acpi_processor *pr, |
166 | struct acpi_processor_cx *cx) | |
e9e2cdb4 | 167 | { |
aa6b43d5 | 168 | return cx - pr->power.states >= pr->power.timer_broadcast_on_state; |
169a0abb TG |
169 | } |
170 | ||
171 | #else | |
172 | ||
7e275cc4 | 173 | static void lapic_timer_check_state(int state, struct acpi_processor *pr, |
169a0abb | 174 | struct acpi_processor_cx *cstate) { } |
7e275cc4 | 175 | static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { } |
aa6b43d5 PZ |
176 | |
177 | static bool lapic_timer_needs_broadcast(struct acpi_processor *pr, | |
178 | struct acpi_processor_cx *cx) | |
e9e2cdb4 | 179 | { |
95592128 | 180 | return false; |
e9e2cdb4 | 181 | } |
169a0abb TG |
182 | |
183 | #endif | |
184 | ||
592913ec | 185 | #if defined(CONFIG_X86) |
520daf72 | 186 | static void tsc_check_state(int state) |
ddb25f9a AK |
187 | { |
188 | switch (boot_cpu_data.x86_vendor) { | |
7377ed4b | 189 | case X86_VENDOR_HYGON: |
ddb25f9a | 190 | case X86_VENDOR_AMD: |
40fb1715 | 191 | case X86_VENDOR_INTEL: |
fe6daab1 | 192 | case X86_VENDOR_CENTAUR: |
773b2f30 | 193 | case X86_VENDOR_ZHAOXIN: |
ddb25f9a AK |
194 | /* |
195 | * AMD Fam10h TSC will tick in all | |
196 | * C/P/S0/S1 states when this bit is set. | |
197 | */ | |
40fb1715 | 198 | if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) |
520daf72 | 199 | return; |
57d2dd4b | 200 | fallthrough; |
ddb25f9a | 201 | default: |
520daf72 LB |
202 | /* TSC could halt in idle, so notify users */ |
203 | if (state > ACPI_STATE_C1) | |
204 | mark_tsc_unstable("TSC halts in idle"); | |
ddb25f9a AK |
205 | } |
206 | } | |
520daf72 LB |
207 | #else |
208 | static void tsc_check_state(int state) { return; } | |
ddb25f9a AK |
209 | #endif |
210 | ||
4be44fcd | 211 | static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) |
1da177e4 | 212 | { |
1da177e4 | 213 | |
1da177e4 | 214 | if (!pr->pblk) |
d550d98d | 215 | return -ENODEV; |
1da177e4 | 216 | |
1da177e4 | 217 | /* if info is obtained from pblk/fadt, type equals state */ |
1da177e4 LT |
218 | pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; |
219 | pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3; | |
220 | ||
4c033552 VP |
221 | #ifndef CONFIG_HOTPLUG_CPU |
222 | /* | |
223 | * Check for P_LVL2_UP flag before entering C2 and above on | |
4f86d3a8 | 224 | * an SMP system. |
4c033552 | 225 | */ |
ad71860a | 226 | if ((num_online_cpus() > 1) && |
cee324b1 | 227 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) |
d550d98d | 228 | return -ENODEV; |
4c033552 VP |
229 | #endif |
230 | ||
1da177e4 LT |
231 | /* determine C2 and C3 address from pblk */ |
232 | pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4; | |
233 | pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5; | |
234 | ||
235 | /* determine latencies from FADT */ | |
ba494bee BM |
236 | pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency; |
237 | pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency; | |
1da177e4 | 238 | |
5d76b6f6 LB |
239 | /* |
240 | * FADT specified C2 latency must be less than or equal to | |
241 | * 100 microseconds. | |
242 | */ | |
ba494bee | 243 | if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) { |
52af99c3 RW |
244 | acpi_handle_debug(pr->handle, "C2 latency too large [%d]\n", |
245 | acpi_gbl_FADT.c2_latency); | |
5d76b6f6 LB |
246 | /* invalidate C2 */ |
247 | pr->power.states[ACPI_STATE_C2].address = 0; | |
248 | } | |
249 | ||
a6d72c18 LB |
250 | /* |
251 | * FADT supplied C3 latency must be less than or equal to | |
252 | * 1000 microseconds. | |
253 | */ | |
ba494bee | 254 | if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) { |
52af99c3 RW |
255 | acpi_handle_debug(pr->handle, "C3 latency too large [%d]\n", |
256 | acpi_gbl_FADT.c3_latency); | |
a6d72c18 LB |
257 | /* invalidate C3 */ |
258 | pr->power.states[ACPI_STATE_C3].address = 0; | |
259 | } | |
260 | ||
52af99c3 | 261 | acpi_handle_debug(pr->handle, "lvl2[0x%08x] lvl3[0x%08x]\n", |
1da177e4 | 262 | pr->power.states[ACPI_STATE_C2].address, |
52af99c3 | 263 | pr->power.states[ACPI_STATE_C3].address); |
1da177e4 | 264 | |
34a62cd0 YG |
265 | snprintf(pr->power.states[ACPI_STATE_C2].desc, |
266 | ACPI_CX_DESC_LEN, "ACPI P_LVL2 IOPORT 0x%x", | |
267 | pr->power.states[ACPI_STATE_C2].address); | |
268 | snprintf(pr->power.states[ACPI_STATE_C3].desc, | |
269 | ACPI_CX_DESC_LEN, "ACPI P_LVL3 IOPORT 0x%x", | |
270 | pr->power.states[ACPI_STATE_C3].address); | |
271 | ||
d550d98d | 272 | return 0; |
1da177e4 LT |
273 | } |
274 | ||
991528d7 | 275 | static int acpi_processor_get_power_info_default(struct acpi_processor *pr) |
acf05f4b | 276 | { |
991528d7 VP |
277 | if (!pr->power.states[ACPI_STATE_C1].valid) { |
278 | /* set the first C-State to C1 */ | |
279 | /* all processors need to support C1 */ | |
280 | pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1; | |
281 | pr->power.states[ACPI_STATE_C1].valid = 1; | |
0fda6b40 | 282 | pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT; |
248e8841 YG |
283 | |
284 | snprintf(pr->power.states[ACPI_STATE_C1].desc, | |
285 | ACPI_CX_DESC_LEN, "ACPI HLT"); | |
991528d7 VP |
286 | } |
287 | /* the C0 state only exists as a filler in our array */ | |
acf05f4b | 288 | pr->power.states[ACPI_STATE_C0].valid = 1; |
d550d98d | 289 | return 0; |
acf05f4b VP |
290 | } |
291 | ||
987c7853 RW |
292 | static int acpi_processor_get_power_info_cst(struct acpi_processor *pr) |
293 | { | |
294 | int ret; | |
295 | ||
296 | if (nocst) | |
297 | return -ENODEV; | |
298 | ||
299 | ret = acpi_processor_evaluate_cst(pr->handle, pr->id, &pr->power); | |
300 | if (ret) | |
301 | return ret; | |
302 | ||
496121c0 | 303 | if (!pr->power.count) |
987c7853 RW |
304 | return -EFAULT; |
305 | ||
306 | pr->flags.has_cst = 1; | |
307 | return 0; | |
308 | } | |
309 | ||
4be44fcd LB |
310 | static void acpi_processor_power_verify_c3(struct acpi_processor *pr, |
311 | struct acpi_processor_cx *cx) | |
1da177e4 | 312 | { |
ee1ca48f PV |
313 | static int bm_check_flag = -1; |
314 | static int bm_control_flag = -1; | |
02df8b93 | 315 | |
1da177e4 LT |
316 | |
317 | if (!cx->address) | |
d550d98d | 318 | return; |
1da177e4 | 319 | |
1da177e4 LT |
320 | /* |
321 | * PIIX4 Erratum #18: We don't support C3 when Type-F (fast) | |
322 | * DMA transfers are used by any ISA device to avoid livelock. | |
323 | * Note that we could disable Type-F DMA (as recommended by | |
324 | * the erratum), but this is known to disrupt certain ISA | |
325 | * devices thus we take the conservative approach. | |
326 | */ | |
327 | else if (errata.piix4.fdma) { | |
52af99c3 RW |
328 | acpi_handle_debug(pr->handle, |
329 | "C3 not supported on PIIX4 with Type-F DMA\n"); | |
d550d98d | 330 | return; |
1da177e4 LT |
331 | } |
332 | ||
02df8b93 | 333 | /* All the logic here assumes flags.bm_check is same across all CPUs */ |
ee1ca48f | 334 | if (bm_check_flag == -1) { |
02df8b93 VP |
335 | /* Determine whether bm_check is needed based on CPU */ |
336 | acpi_processor_power_init_bm_check(&(pr->flags), pr->id); | |
337 | bm_check_flag = pr->flags.bm_check; | |
ee1ca48f | 338 | bm_control_flag = pr->flags.bm_control; |
02df8b93 VP |
339 | } else { |
340 | pr->flags.bm_check = bm_check_flag; | |
ee1ca48f | 341 | pr->flags.bm_control = bm_control_flag; |
02df8b93 VP |
342 | } |
343 | ||
344 | if (pr->flags.bm_check) { | |
02df8b93 | 345 | if (!pr->flags.bm_control) { |
ed3110ef VP |
346 | if (pr->flags.has_cst != 1) { |
347 | /* bus mastering control is necessary */ | |
52af99c3 RW |
348 | acpi_handle_debug(pr->handle, |
349 | "C3 support requires BM control\n"); | |
ed3110ef VP |
350 | return; |
351 | } else { | |
352 | /* Here we enter C3 without bus mastering */ | |
52af99c3 RW |
353 | acpi_handle_debug(pr->handle, |
354 | "C3 support without BM control\n"); | |
ed3110ef | 355 | } |
02df8b93 VP |
356 | } |
357 | } else { | |
02df8b93 VP |
358 | /* |
359 | * WBINVD should be set in fadt, for C3 state to be | |
360 | * supported on when bm_check is not required. | |
361 | */ | |
cee324b1 | 362 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) { |
52af99c3 | 363 | acpi_handle_debug(pr->handle, |
4be44fcd | 364 | "Cache invalidation should work properly" |
52af99c3 | 365 | " for C3 to be enabled on SMP systems\n"); |
d550d98d | 366 | return; |
02df8b93 | 367 | } |
02df8b93 VP |
368 | } |
369 | ||
1da177e4 LT |
370 | /* |
371 | * Otherwise we've met all of our C3 requirements. | |
372 | * Normalize the C3 latency to expidite policy. Enable | |
373 | * checking of bus mastering status (bm_check) so we can | |
374 | * use this in our C3 policy | |
375 | */ | |
376 | cx->valid = 1; | |
4f86d3a8 | 377 | |
31878dd8 LB |
378 | /* |
379 | * On older chipsets, BM_RLD needs to be set | |
380 | * in order for Bus Master activity to wake the | |
381 | * system from C3. Newer chipsets handle DMA | |
382 | * during C3 automatically and BM_RLD is a NOP. | |
383 | * In either case, the proper way to | |
384 | * handle BM_RLD is to set it and leave it set. | |
385 | */ | |
50ffba1b | 386 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1); |
1da177e4 | 387 | |
d550d98d | 388 | return; |
1da177e4 LT |
389 | } |
390 | ||
65ea8f2c ML |
391 | static int acpi_cst_latency_cmp(const void *a, const void *b) |
392 | { | |
393 | const struct acpi_processor_cx *x = a, *y = b; | |
394 | ||
395 | if (!(x->valid && y->valid)) | |
396 | return 0; | |
397 | if (x->latency > y->latency) | |
398 | return 1; | |
399 | if (x->latency < y->latency) | |
400 | return -1; | |
401 | return 0; | |
402 | } | |
403 | static void acpi_cst_latency_swap(void *a, void *b, int n) | |
404 | { | |
405 | struct acpi_processor_cx *x = a, *y = b; | |
65ea8f2c ML |
406 | |
407 | if (!(x->valid && y->valid)) | |
408 | return; | |
0e6078c3 | 409 | swap(x->latency, y->latency); |
65ea8f2c ML |
410 | } |
411 | ||
1da177e4 LT |
412 | static int acpi_processor_power_verify(struct acpi_processor *pr) |
413 | { | |
414 | unsigned int i; | |
415 | unsigned int working = 0; | |
65ea8f2c ML |
416 | unsigned int last_latency = 0; |
417 | unsigned int last_type = 0; | |
418 | bool buggy_latency = false; | |
6eb0a0fd | 419 | |
169a0abb | 420 | pr->power.timer_broadcast_on_state = INT_MAX; |
6eb0a0fd | 421 | |
a0bf284b | 422 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
1da177e4 LT |
423 | struct acpi_processor_cx *cx = &pr->power.states[i]; |
424 | ||
425 | switch (cx->type) { | |
426 | case ACPI_STATE_C1: | |
427 | cx->valid = 1; | |
428 | break; | |
429 | ||
430 | case ACPI_STATE_C2: | |
d22edd29 LB |
431 | if (!cx->address) |
432 | break; | |
cad1525a | 433 | cx->valid = 1; |
1da177e4 LT |
434 | break; |
435 | ||
436 | case ACPI_STATE_C3: | |
437 | acpi_processor_power_verify_c3(pr, cx); | |
438 | break; | |
439 | } | |
7e275cc4 LB |
440 | if (!cx->valid) |
441 | continue; | |
65ea8f2c ML |
442 | if (cx->type >= last_type && cx->latency < last_latency) |
443 | buggy_latency = true; | |
444 | last_latency = cx->latency; | |
445 | last_type = cx->type; | |
1da177e4 | 446 | |
7e275cc4 LB |
447 | lapic_timer_check_state(i, pr, cx); |
448 | tsc_check_state(cx->type); | |
449 | working++; | |
1da177e4 | 450 | } |
bd663347 | 451 | |
65ea8f2c ML |
452 | if (buggy_latency) { |
453 | pr_notice("FW issue: working around C-state latencies out of order\n"); | |
454 | sort(&pr->power.states[1], max_cstate, | |
455 | sizeof(struct acpi_processor_cx), | |
456 | acpi_cst_latency_cmp, | |
457 | acpi_cst_latency_swap); | |
458 | } | |
459 | ||
918aae42 | 460 | lapic_timer_propagate_broadcast(pr); |
1da177e4 LT |
461 | |
462 | return (working); | |
463 | } | |
464 | ||
a36a7fec | 465 | static int acpi_processor_get_cstate_info(struct acpi_processor *pr) |
1da177e4 LT |
466 | { |
467 | unsigned int i; | |
468 | int result; | |
469 | ||
1da177e4 LT |
470 | |
471 | /* NOTE: the idle thread may not be running while calling | |
472 | * this function */ | |
473 | ||
991528d7 VP |
474 | /* Zero initialize all the C-states info. */ |
475 | memset(pr->power.states, 0, sizeof(pr->power.states)); | |
476 | ||
1da177e4 | 477 | result = acpi_processor_get_power_info_cst(pr); |
6d93c648 | 478 | if (result == -ENODEV) |
c5a114f1 | 479 | result = acpi_processor_get_power_info_fadt(pr); |
6d93c648 | 480 | |
991528d7 VP |
481 | if (result) |
482 | return result; | |
483 | ||
484 | acpi_processor_get_power_info_default(pr); | |
485 | ||
cf824788 | 486 | pr->power.count = acpi_processor_power_verify(pr); |
1da177e4 | 487 | |
1da177e4 LT |
488 | /* |
489 | * if one state of type C2 or C3 is available, mark this | |
490 | * CPU as being "idle manageable" | |
491 | */ | |
492 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) { | |
acf05f4b | 493 | if (pr->power.states[i].valid) { |
1da177e4 | 494 | pr->power.count = i; |
496121c0 | 495 | pr->flags.power = 1; |
acf05f4b | 496 | } |
1da177e4 LT |
497 | } |
498 | ||
d550d98d | 499 | return 0; |
1da177e4 LT |
500 | } |
501 | ||
4f86d3a8 LB |
502 | /** |
503 | * acpi_idle_bm_check - checks if bus master activity was detected | |
504 | */ | |
505 | static int acpi_idle_bm_check(void) | |
506 | { | |
507 | u32 bm_status = 0; | |
508 | ||
d3e7e99f LB |
509 | if (bm_check_disable) |
510 | return 0; | |
511 | ||
50ffba1b | 512 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status); |
4f86d3a8 | 513 | if (bm_status) |
50ffba1b | 514 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1); |
4f86d3a8 LB |
515 | /* |
516 | * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect | |
517 | * the true state of bus mastering activity; forcing us to | |
518 | * manually check the BMIDEA bit of each IDE channel. | |
519 | */ | |
520 | else if (errata.piix4.bmisx) { | |
521 | if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01) | |
522 | || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01)) | |
523 | bm_status = 1; | |
524 | } | |
525 | return bm_status; | |
526 | } | |
527 | ||
fa583f71 YF |
528 | static void wait_for_freeze(void) |
529 | { | |
530 | #ifdef CONFIG_X86 | |
531 | /* No delay is needed if we are in guest */ | |
532 | if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) | |
533 | return; | |
534 | #endif | |
535 | /* Dummy wait op - must do something useless after P_LVL2 read | |
536 | because chipsets cannot guarantee that STPCLK# signal | |
537 | gets asserted in time to freeze execution properly. */ | |
538 | inl(acpi_gbl_FADT.xpm_timer_block.address); | |
539 | } | |
540 | ||
4f86d3a8 | 541 | /** |
b00783fd | 542 | * acpi_idle_do_entry - enter idle state using the appropriate method |
4f86d3a8 | 543 | * @cx: cstate data |
bc71bec9 | 544 | * |
545 | * Caller disables interrupt before call and enables interrupt after return. | |
4f86d3a8 | 546 | */ |
6727ad9e | 547 | static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx) |
4f86d3a8 | 548 | { |
2a606a18 SE |
549 | perf_lopwr_cb(true); |
550 | ||
bc71bec9 | 551 | if (cx->entry_method == ACPI_CSTATE_FFH) { |
4f86d3a8 LB |
552 | /* Call into architectural FFH based C-state */ |
553 | acpi_processor_ffh_cstate_enter(cx); | |
bc71bec9 | 554 | } else if (cx->entry_method == ACPI_CSTATE_HALT) { |
555 | acpi_safe_halt(); | |
4f86d3a8 | 556 | } else { |
4f86d3a8 LB |
557 | /* IO port based C-state */ |
558 | inb(cx->address); | |
fa583f71 | 559 | wait_for_freeze(); |
4f86d3a8 | 560 | } |
2a606a18 SE |
561 | |
562 | perf_lopwr_cb(false); | |
4f86d3a8 LB |
563 | } |
564 | ||
1a022e3f BO |
565 | /** |
566 | * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) | |
567 | * @dev: the target CPU | |
568 | * @index: the index of suggested state | |
569 | */ | |
570 | static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) | |
571 | { | |
6240a10d | 572 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); |
1a022e3f | 573 | |
dfbba251 | 574 | ACPI_FLUSH_CPU_CACHE(); |
1a022e3f BO |
575 | |
576 | while (1) { | |
577 | ||
578 | if (cx->entry_method == ACPI_CSTATE_HALT) | |
54f70077 | 579 | safe_halt(); |
1a022e3f BO |
580 | else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { |
581 | inb(cx->address); | |
fa583f71 | 582 | wait_for_freeze(); |
1a022e3f BO |
583 | } else |
584 | return -ENODEV; | |
8cdddd18 VK |
585 | |
586 | #if defined(CONFIG_X86) && defined(CONFIG_HOTPLUG_CPU) | |
fa26d0c7 | 587 | cond_wakeup_cpu0(); |
8cdddd18 | 588 | #endif |
1a022e3f BO |
589 | } |
590 | ||
591 | /* Never reached */ | |
592 | return 0; | |
593 | } | |
594 | ||
adcb2623 RW |
595 | static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr) |
596 | { | |
5f508185 RW |
597 | return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst && |
598 | !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED); | |
adcb2623 RW |
599 | } |
600 | ||
4f86d3a8 | 601 | static int c3_cpu_count; |
e12f65f7 | 602 | static DEFINE_RAW_SPINLOCK(c3_lock); |
4f86d3a8 LB |
603 | |
604 | /** | |
605 | * acpi_idle_enter_bm - enters C3 with proper BM handling | |
1fecfdbb | 606 | * @drv: cpuidle driver |
6491bc0c RW |
607 | * @pr: Target processor |
608 | * @cx: Target state context | |
1fecfdbb | 609 | * @index: index of target state |
4f86d3a8 | 610 | */ |
1fecfdbb PZ |
611 | static int acpi_idle_enter_bm(struct cpuidle_driver *drv, |
612 | struct acpi_processor *pr, | |
613 | struct acpi_processor_cx *cx, | |
614 | int index) | |
4f86d3a8 | 615 | { |
1fecfdbb PZ |
616 | static struct acpi_processor_cx safe_cx = { |
617 | .entry_method = ACPI_CSTATE_HALT, | |
618 | }; | |
619 | ||
ddc081a1 VP |
620 | /* |
621 | * disable bus master | |
622 | * bm_check implies we need ARB_DIS | |
ddc081a1 VP |
623 | * bm_control implies whether we can do ARB_DIS |
624 | * | |
1fecfdbb PZ |
625 | * That leaves a case where bm_check is set and bm_control is not set. |
626 | * In that case we cannot do much, we enter C3 without doing anything. | |
ddc081a1 | 627 | */ |
1fecfdbb PZ |
628 | bool dis_bm = pr->flags.bm_control; |
629 | ||
630 | /* If we can skip BM, demote to a safe state. */ | |
631 | if (!cx->bm_sts_skip && acpi_idle_bm_check()) { | |
632 | dis_bm = false; | |
633 | index = drv->safe_state_index; | |
634 | if (index >= 0) { | |
635 | cx = this_cpu_read(acpi_cstate[index]); | |
636 | } else { | |
637 | cx = &safe_cx; | |
638 | index = -EBUSY; | |
639 | } | |
640 | } | |
641 | ||
642 | if (dis_bm) { | |
e12f65f7 | 643 | raw_spin_lock(&c3_lock); |
4f86d3a8 LB |
644 | c3_cpu_count++; |
645 | /* Disable bus master arbitration when all CPUs are in C3 */ | |
646 | if (c3_cpu_count == num_online_cpus()) | |
50ffba1b | 647 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1); |
e12f65f7 | 648 | raw_spin_unlock(&c3_lock); |
ddc081a1 | 649 | } |
4f86d3a8 | 650 | |
e67198cc | 651 | ct_idle_enter(); |
1fecfdbb | 652 | |
ddc081a1 | 653 | acpi_idle_do_entry(cx); |
4f86d3a8 | 654 | |
e67198cc | 655 | ct_idle_exit(); |
1fecfdbb | 656 | |
ddc081a1 | 657 | /* Re-enable bus master arbitration */ |
1fecfdbb | 658 | if (dis_bm) { |
e12f65f7 | 659 | raw_spin_lock(&c3_lock); |
50ffba1b | 660 | acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0); |
4f86d3a8 | 661 | c3_cpu_count--; |
e12f65f7 | 662 | raw_spin_unlock(&c3_lock); |
4f86d3a8 | 663 | } |
1fecfdbb PZ |
664 | |
665 | return index; | |
6491bc0c RW |
666 | } |
667 | ||
668 | static int acpi_idle_enter(struct cpuidle_device *dev, | |
669 | struct cpuidle_driver *drv, int index) | |
670 | { | |
671 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); | |
672 | struct acpi_processor *pr; | |
673 | ||
674 | pr = __this_cpu_read(processors); | |
675 | if (unlikely(!pr)) | |
676 | return -EINVAL; | |
677 | ||
678 | if (cx->type != ACPI_STATE_C1) { | |
1fecfdbb PZ |
679 | if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check) |
680 | return acpi_idle_enter_bm(drv, pr, cx, index); | |
681 | ||
682 | /* C2 to C1 demotion. */ | |
5f508185 | 683 | if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) { |
dc2251bf | 684 | index = ACPI_IDLE_STATE_START; |
6491bc0c | 685 | cx = per_cpu(acpi_cstate[index], dev->cpu); |
6491bc0c RW |
686 | } |
687 | } | |
688 | ||
6491bc0c RW |
689 | if (cx->type == ACPI_STATE_C3) |
690 | ACPI_FLUSH_CPU_CACHE(); | |
691 | ||
692 | acpi_idle_do_entry(cx); | |
693 | ||
e978aa7d | 694 | return index; |
4f86d3a8 LB |
695 | } |
696 | ||
efe97112 NL |
697 | static int acpi_idle_enter_s2idle(struct cpuidle_device *dev, |
698 | struct cpuidle_driver *drv, int index) | |
5f508185 RW |
699 | { |
700 | struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu); | |
701 | ||
702 | if (cx->type == ACPI_STATE_C3) { | |
703 | struct acpi_processor *pr = __this_cpu_read(processors); | |
704 | ||
705 | if (unlikely(!pr)) | |
0a398945 | 706 | return 0; |
5f508185 RW |
707 | |
708 | if (pr->flags.bm_check) { | |
1fecfdbb PZ |
709 | u8 bm_sts_skip = cx->bm_sts_skip; |
710 | ||
711 | /* Don't check BM_STS, do an unconditional ARB_DIS for S2IDLE */ | |
712 | cx->bm_sts_skip = 1; | |
713 | acpi_idle_enter_bm(drv, pr, cx, index); | |
714 | cx->bm_sts_skip = bm_sts_skip; | |
715 | ||
0a398945 | 716 | return 0; |
5f508185 RW |
717 | } else { |
718 | ACPI_FLUSH_CPU_CACHE(); | |
719 | } | |
720 | } | |
721 | acpi_idle_do_entry(cx); | |
efe97112 NL |
722 | |
723 | return 0; | |
5f508185 RW |
724 | } |
725 | ||
6ef0f086 DL |
726 | static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, |
727 | struct cpuidle_device *dev) | |
4f86d3a8 | 728 | { |
dc2251bf | 729 | int i, count = ACPI_IDLE_STATE_START; |
4f86d3a8 | 730 | struct acpi_processor_cx *cx; |
aa6b43d5 | 731 | struct cpuidle_state *state; |
4f86d3a8 | 732 | |
615dfd93 LB |
733 | if (max_cstate == 0) |
734 | max_cstate = 1; | |
735 | ||
4f86d3a8 | 736 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
a889a23a | 737 | state = &acpi_idle_driver.states[count]; |
4f86d3a8 | 738 | cx = &pr->power.states[i]; |
4f86d3a8 LB |
739 | |
740 | if (!cx->valid) | |
741 | continue; | |
742 | ||
6240a10d | 743 | per_cpu(acpi_cstate[count], dev->cpu) = cx; |
4f86d3a8 | 744 | |
a889a23a | 745 | if (lapic_timer_needs_broadcast(pr, cx)) |
aa6b43d5 | 746 | state->flags |= CPUIDLE_FLAG_TIMER_STOP; |
a889a23a | 747 | |
1fecfdbb | 748 | if (cx->type == ACPI_STATE_C3) { |
a889a23a | 749 | state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; |
1fecfdbb PZ |
750 | if (pr->flags.bm_check) |
751 | state->flags |= CPUIDLE_FLAG_RCU_IDLE; | |
752 | } | |
aa6b43d5 | 753 | |
46bcfad7 DD |
754 | count++; |
755 | if (count == CPUIDLE_STATE_MAX) | |
756 | break; | |
757 | } | |
758 | ||
46bcfad7 DD |
759 | if (!count) |
760 | return -EINVAL; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
a36a7fec | 765 | static int acpi_processor_setup_cstates(struct acpi_processor *pr) |
46bcfad7 | 766 | { |
1b39e3f8 | 767 | int i, count; |
46bcfad7 DD |
768 | struct acpi_processor_cx *cx; |
769 | struct cpuidle_state *state; | |
770 | struct cpuidle_driver *drv = &acpi_idle_driver; | |
771 | ||
615dfd93 LB |
772 | if (max_cstate == 0) |
773 | max_cstate = 1; | |
774 | ||
1b39e3f8 RW |
775 | if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) { |
776 | cpuidle_poll_state_init(drv); | |
777 | count = 1; | |
778 | } else { | |
779 | count = 0; | |
780 | } | |
781 | ||
4f86d3a8 LB |
782 | for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) { |
783 | cx = &pr->power.states[i]; | |
4f86d3a8 LB |
784 | |
785 | if (!cx->valid) | |
786 | continue; | |
787 | ||
46bcfad7 | 788 | state = &drv->states[count]; |
4f86d3a8 | 789 | snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i); |
a36a7fec | 790 | strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); |
4f86d3a8 | 791 | state->exit_latency = cx->latency; |
4963f620 | 792 | state->target_residency = cx->latency * latency_factor; |
6491bc0c | 793 | state->enter = acpi_idle_enter; |
4f86d3a8 LB |
794 | |
795 | state->flags = 0; | |
d6b88ce2 RG |
796 | if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2 || |
797 | cx->type == ACPI_STATE_C3) { | |
1a022e3f | 798 | state->enter_dead = acpi_idle_play_dead; |
fc45e55e VS |
799 | if (cx->type != ACPI_STATE_C3) |
800 | drv->safe_state_index = count; | |
4f86d3a8 | 801 | } |
5f508185 | 802 | /* |
28ba086e | 803 | * Halt-induced C1 is not good for ->enter_s2idle, because it |
5f508185 RW |
804 | * re-enables interrupts on exit. Moreover, C1 is generally not |
805 | * particularly interesting from the suspend-to-idle angle, so | |
806 | * avoid C1 and the situations in which we may need to fall back | |
807 | * to it altogether. | |
808 | */ | |
809 | if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr)) | |
28ba086e | 810 | state->enter_s2idle = acpi_idle_enter_s2idle; |
4f86d3a8 LB |
811 | |
812 | count++; | |
9a0b8415 | 813 | if (count == CPUIDLE_STATE_MAX) |
814 | break; | |
4f86d3a8 LB |
815 | } |
816 | ||
46bcfad7 | 817 | drv->state_count = count; |
4f86d3a8 LB |
818 | |
819 | if (!count) | |
820 | return -EINVAL; | |
821 | ||
4f86d3a8 LB |
822 | return 0; |
823 | } | |
824 | ||
35ae7133 SH |
825 | static inline void acpi_processor_cstate_first_run_checks(void) |
826 | { | |
35ae7133 SH |
827 | static int first_run; |
828 | ||
829 | if (first_run) | |
830 | return; | |
831 | dmi_check_system(processor_power_dmi_table); | |
832 | max_cstate = acpi_processor_cstate_check(max_cstate); | |
833 | if (max_cstate < ACPI_C_STATES_MAX) | |
54e05192 RW |
834 | pr_notice("processor limited to max C-state %d\n", max_cstate); |
835 | ||
35ae7133 SH |
836 | first_run++; |
837 | ||
bc946388 RW |
838 | if (nocst) |
839 | return; | |
840 | ||
841 | acpi_processor_claim_cst_control(); | |
35ae7133 SH |
842 | } |
843 | #else | |
844 | ||
845 | static inline int disabled_by_idle_boot_param(void) { return 0; } | |
846 | static inline void acpi_processor_cstate_first_run_checks(void) { } | |
a36a7fec | 847 | static int acpi_processor_get_cstate_info(struct acpi_processor *pr) |
35ae7133 SH |
848 | { |
849 | return -ENODEV; | |
850 | } | |
851 | ||
852 | static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr, | |
853 | struct cpuidle_device *dev) | |
854 | { | |
855 | return -EINVAL; | |
856 | } | |
857 | ||
a36a7fec | 858 | static int acpi_processor_setup_cstates(struct acpi_processor *pr) |
35ae7133 SH |
859 | { |
860 | return -EINVAL; | |
861 | } | |
862 | ||
863 | #endif /* CONFIG_ACPI_PROCESSOR_CSTATE */ | |
864 | ||
a36a7fec SH |
865 | struct acpi_lpi_states_array { |
866 | unsigned int size; | |
867 | unsigned int composite_states_size; | |
868 | struct acpi_lpi_state *entries; | |
869 | struct acpi_lpi_state *composite_states[ACPI_PROCESSOR_MAX_POWER]; | |
870 | }; | |
871 | ||
872 | static int obj_get_integer(union acpi_object *obj, u32 *value) | |
873 | { | |
874 | if (obj->type != ACPI_TYPE_INTEGER) | |
875 | return -EINVAL; | |
876 | ||
877 | *value = obj->integer.value; | |
878 | return 0; | |
879 | } | |
880 | ||
881 | static int acpi_processor_evaluate_lpi(acpi_handle handle, | |
882 | struct acpi_lpi_states_array *info) | |
883 | { | |
884 | acpi_status status; | |
885 | int ret = 0; | |
886 | int pkg_count, state_idx = 1, loop; | |
887 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
888 | union acpi_object *lpi_data; | |
889 | struct acpi_lpi_state *lpi_state; | |
890 | ||
891 | status = acpi_evaluate_object(handle, "_LPI", NULL, &buffer); | |
892 | if (ACPI_FAILURE(status)) { | |
52af99c3 | 893 | acpi_handle_debug(handle, "No _LPI, giving up\n"); |
a36a7fec SH |
894 | return -ENODEV; |
895 | } | |
896 | ||
897 | lpi_data = buffer.pointer; | |
898 | ||
899 | /* There must be at least 4 elements = 3 elements + 1 package */ | |
900 | if (!lpi_data || lpi_data->type != ACPI_TYPE_PACKAGE || | |
901 | lpi_data->package.count < 4) { | |
902 | pr_debug("not enough elements in _LPI\n"); | |
903 | ret = -ENODATA; | |
904 | goto end; | |
905 | } | |
906 | ||
907 | pkg_count = lpi_data->package.elements[2].integer.value; | |
908 | ||
909 | /* Validate number of power states. */ | |
910 | if (pkg_count < 1 || pkg_count != lpi_data->package.count - 3) { | |
911 | pr_debug("count given by _LPI is not valid\n"); | |
912 | ret = -ENODATA; | |
913 | goto end; | |
914 | } | |
915 | ||
916 | lpi_state = kcalloc(pkg_count, sizeof(*lpi_state), GFP_KERNEL); | |
917 | if (!lpi_state) { | |
918 | ret = -ENOMEM; | |
919 | goto end; | |
920 | } | |
921 | ||
922 | info->size = pkg_count; | |
923 | info->entries = lpi_state; | |
924 | ||
925 | /* LPI States start at index 3 */ | |
926 | for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, lpi_state++) { | |
927 | union acpi_object *element, *pkg_elem, *obj; | |
928 | ||
929 | element = &lpi_data->package.elements[loop]; | |
930 | if (element->type != ACPI_TYPE_PACKAGE || element->package.count < 7) | |
931 | continue; | |
932 | ||
933 | pkg_elem = element->package.elements; | |
934 | ||
935 | obj = pkg_elem + 6; | |
936 | if (obj->type == ACPI_TYPE_BUFFER) { | |
937 | struct acpi_power_register *reg; | |
938 | ||
939 | reg = (struct acpi_power_register *)obj->buffer.pointer; | |
940 | if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO && | |
941 | reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) | |
942 | continue; | |
943 | ||
944 | lpi_state->address = reg->address; | |
945 | lpi_state->entry_method = | |
946 | reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE ? | |
947 | ACPI_CSTATE_FFH : ACPI_CSTATE_SYSTEMIO; | |
948 | } else if (obj->type == ACPI_TYPE_INTEGER) { | |
949 | lpi_state->entry_method = ACPI_CSTATE_INTEGER; | |
950 | lpi_state->address = obj->integer.value; | |
951 | } else { | |
952 | continue; | |
953 | } | |
954 | ||
955 | /* elements[7,8] skipped for now i.e. Residency/Usage counter*/ | |
956 | ||
957 | obj = pkg_elem + 9; | |
958 | if (obj->type == ACPI_TYPE_STRING) | |
959 | strlcpy(lpi_state->desc, obj->string.pointer, | |
960 | ACPI_CX_DESC_LEN); | |
961 | ||
962 | lpi_state->index = state_idx; | |
963 | if (obj_get_integer(pkg_elem + 0, &lpi_state->min_residency)) { | |
964 | pr_debug("No min. residency found, assuming 10 us\n"); | |
965 | lpi_state->min_residency = 10; | |
966 | } | |
967 | ||
968 | if (obj_get_integer(pkg_elem + 1, &lpi_state->wake_latency)) { | |
969 | pr_debug("No wakeup residency found, assuming 10 us\n"); | |
970 | lpi_state->wake_latency = 10; | |
971 | } | |
972 | ||
973 | if (obj_get_integer(pkg_elem + 2, &lpi_state->flags)) | |
974 | lpi_state->flags = 0; | |
975 | ||
976 | if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags)) | |
977 | lpi_state->arch_flags = 0; | |
978 | ||
979 | if (obj_get_integer(pkg_elem + 4, &lpi_state->res_cnt_freq)) | |
980 | lpi_state->res_cnt_freq = 1; | |
981 | ||
982 | if (obj_get_integer(pkg_elem + 5, &lpi_state->enable_parent_state)) | |
983 | lpi_state->enable_parent_state = 0; | |
984 | } | |
985 | ||
986 | acpi_handle_debug(handle, "Found %d power states\n", state_idx); | |
987 | end: | |
988 | kfree(buffer.pointer); | |
989 | return ret; | |
990 | } | |
991 | ||
992 | /* | |
993 | * flat_state_cnt - the number of composite LPI states after the process of flattening | |
994 | */ | |
995 | static int flat_state_cnt; | |
996 | ||
997 | /** | |
998 | * combine_lpi_states - combine local and parent LPI states to form a composite LPI state | |
999 | * | |
1000 | * @local: local LPI state | |
1001 | * @parent: parent LPI state | |
1002 | * @result: composite LPI state | |
1003 | */ | |
1004 | static bool combine_lpi_states(struct acpi_lpi_state *local, | |
1005 | struct acpi_lpi_state *parent, | |
1006 | struct acpi_lpi_state *result) | |
1007 | { | |
1008 | if (parent->entry_method == ACPI_CSTATE_INTEGER) { | |
1009 | if (!parent->address) /* 0 means autopromotable */ | |
1010 | return false; | |
1011 | result->address = local->address + parent->address; | |
1012 | } else { | |
1013 | result->address = parent->address; | |
1014 | } | |
1015 | ||
1016 | result->min_residency = max(local->min_residency, parent->min_residency); | |
1017 | result->wake_latency = local->wake_latency + parent->wake_latency; | |
1018 | result->enable_parent_state = parent->enable_parent_state; | |
1019 | result->entry_method = local->entry_method; | |
1020 | ||
1021 | result->flags = parent->flags; | |
1022 | result->arch_flags = parent->arch_flags; | |
1023 | result->index = parent->index; | |
1024 | ||
1025 | strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN); | |
1026 | strlcat(result->desc, "+", ACPI_CX_DESC_LEN); | |
1027 | strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN); | |
1028 | return true; | |
1029 | } | |
1030 | ||
1031 | #define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0) | |
1032 | ||
1033 | static void stash_composite_state(struct acpi_lpi_states_array *curr_level, | |
1034 | struct acpi_lpi_state *t) | |
1035 | { | |
1036 | curr_level->composite_states[curr_level->composite_states_size++] = t; | |
1037 | } | |
1038 | ||
1039 | static int flatten_lpi_states(struct acpi_processor *pr, | |
1040 | struct acpi_lpi_states_array *curr_level, | |
1041 | struct acpi_lpi_states_array *prev_level) | |
1042 | { | |
1043 | int i, j, state_count = curr_level->size; | |
1044 | struct acpi_lpi_state *p, *t = curr_level->entries; | |
1045 | ||
1046 | curr_level->composite_states_size = 0; | |
1047 | for (j = 0; j < state_count; j++, t++) { | |
1048 | struct acpi_lpi_state *flpi; | |
1049 | ||
1050 | if (!(t->flags & ACPI_LPI_STATE_FLAGS_ENABLED)) | |
1051 | continue; | |
1052 | ||
1053 | if (flat_state_cnt >= ACPI_PROCESSOR_MAX_POWER) { | |
1054 | pr_warn("Limiting number of LPI states to max (%d)\n", | |
1055 | ACPI_PROCESSOR_MAX_POWER); | |
1056 | pr_warn("Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n"); | |
1057 | break; | |
1058 | } | |
1059 | ||
1060 | flpi = &pr->power.lpi_states[flat_state_cnt]; | |
1061 | ||
1062 | if (!prev_level) { /* leaf/processor node */ | |
1063 | memcpy(flpi, t, sizeof(*t)); | |
1064 | stash_composite_state(curr_level, flpi); | |
1065 | flat_state_cnt++; | |
1066 | continue; | |
1067 | } | |
1068 | ||
1069 | for (i = 0; i < prev_level->composite_states_size; i++) { | |
1070 | p = prev_level->composite_states[i]; | |
1071 | if (t->index <= p->enable_parent_state && | |
1072 | combine_lpi_states(p, t, flpi)) { | |
1073 | stash_composite_state(curr_level, flpi); | |
1074 | flat_state_cnt++; | |
1075 | flpi++; | |
1076 | } | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | kfree(curr_level->entries); | |
1081 | return 0; | |
1082 | } | |
1083 | ||
eb087f30 ML |
1084 | int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu) |
1085 | { | |
1086 | return -EOPNOTSUPP; | |
1087 | } | |
1088 | ||
a36a7fec SH |
1089 | static int acpi_processor_get_lpi_info(struct acpi_processor *pr) |
1090 | { | |
1091 | int ret, i; | |
1092 | acpi_status status; | |
1093 | acpi_handle handle = pr->handle, pr_ahandle; | |
1094 | struct acpi_device *d = NULL; | |
1095 | struct acpi_lpi_states_array info[2], *tmp, *prev, *curr; | |
1096 | ||
eb087f30 ML |
1097 | /* make sure our architecture has support */ |
1098 | ret = acpi_processor_ffh_lpi_probe(pr->id); | |
1099 | if (ret == -EOPNOTSUPP) | |
1100 | return ret; | |
1101 | ||
a36a7fec SH |
1102 | if (!osc_pc_lpi_support_confirmed) |
1103 | return -EOPNOTSUPP; | |
1104 | ||
1105 | if (!acpi_has_method(handle, "_LPI")) | |
1106 | return -EINVAL; | |
1107 | ||
1108 | flat_state_cnt = 0; | |
1109 | prev = &info[0]; | |
1110 | curr = &info[1]; | |
1111 | handle = pr->handle; | |
1112 | ret = acpi_processor_evaluate_lpi(handle, prev); | |
1113 | if (ret) | |
1114 | return ret; | |
1115 | flatten_lpi_states(pr, prev, NULL); | |
1116 | ||
1117 | status = acpi_get_parent(handle, &pr_ahandle); | |
1118 | while (ACPI_SUCCESS(status)) { | |
99ece713 | 1119 | d = acpi_fetch_acpi_dev(pr_ahandle); |
a36a7fec SH |
1120 | handle = pr_ahandle; |
1121 | ||
1122 | if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID)) | |
1123 | break; | |
1124 | ||
1125 | /* can be optional ? */ | |
1126 | if (!acpi_has_method(handle, "_LPI")) | |
1127 | break; | |
1128 | ||
1129 | ret = acpi_processor_evaluate_lpi(handle, curr); | |
1130 | if (ret) | |
1131 | break; | |
1132 | ||
1133 | /* flatten all the LPI states in this level of hierarchy */ | |
1134 | flatten_lpi_states(pr, curr, prev); | |
1135 | ||
1136 | tmp = prev, prev = curr, curr = tmp; | |
1137 | ||
1138 | status = acpi_get_parent(handle, &pr_ahandle); | |
1139 | } | |
1140 | ||
1141 | pr->power.count = flat_state_cnt; | |
1142 | /* reset the index after flattening */ | |
1143 | for (i = 0; i < pr->power.count; i++) | |
1144 | pr->power.lpi_states[i].index = i; | |
1145 | ||
1146 | /* Tell driver that _LPI is supported. */ | |
1147 | pr->flags.has_lpi = 1; | |
1148 | pr->flags.power = 1; | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
a36a7fec SH |
1153 | int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) |
1154 | { | |
1155 | return -ENODEV; | |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * acpi_idle_lpi_enter - enters an ACPI any LPI state | |
1160 | * @dev: the target CPU | |
1161 | * @drv: cpuidle driver containing cpuidle state info | |
1162 | * @index: index of target state | |
1163 | * | |
1164 | * Return: 0 for success or negative value for error | |
1165 | */ | |
1166 | static int acpi_idle_lpi_enter(struct cpuidle_device *dev, | |
1167 | struct cpuidle_driver *drv, int index) | |
1168 | { | |
1169 | struct acpi_processor *pr; | |
1170 | struct acpi_lpi_state *lpi; | |
1171 | ||
1172 | pr = __this_cpu_read(processors); | |
1173 | ||
1174 | if (unlikely(!pr)) | |
1175 | return -EINVAL; | |
1176 | ||
1177 | lpi = &pr->power.lpi_states[index]; | |
1178 | if (lpi->entry_method == ACPI_CSTATE_FFH) | |
1179 | return acpi_processor_ffh_lpi_enter(lpi); | |
1180 | ||
1181 | return -EINVAL; | |
1182 | } | |
1183 | ||
1184 | static int acpi_processor_setup_lpi_states(struct acpi_processor *pr) | |
1185 | { | |
1186 | int i; | |
1187 | struct acpi_lpi_state *lpi; | |
1188 | struct cpuidle_state *state; | |
1189 | struct cpuidle_driver *drv = &acpi_idle_driver; | |
1190 | ||
1191 | if (!pr->flags.has_lpi) | |
1192 | return -EOPNOTSUPP; | |
1193 | ||
1194 | for (i = 0; i < pr->power.count && i < CPUIDLE_STATE_MAX; i++) { | |
1195 | lpi = &pr->power.lpi_states[i]; | |
1196 | ||
1197 | state = &drv->states[i]; | |
1198 | snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i); | |
1199 | strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN); | |
1200 | state->exit_latency = lpi->wake_latency; | |
1201 | state->target_residency = lpi->min_residency; | |
1202 | if (lpi->arch_flags) | |
1203 | state->flags |= CPUIDLE_FLAG_TIMER_STOP; | |
1204 | state->enter = acpi_idle_lpi_enter; | |
1205 | drv->safe_state_index = i; | |
1206 | } | |
1207 | ||
1208 | drv->state_count = i; | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * acpi_processor_setup_cpuidle_states- prepares and configures cpuidle | |
1215 | * global state data i.e. idle routines | |
1216 | * | |
1217 | * @pr: the ACPI processor | |
1218 | */ | |
1219 | static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) | |
1220 | { | |
1221 | int i; | |
1222 | struct cpuidle_driver *drv = &acpi_idle_driver; | |
1223 | ||
1224 | if (!pr->flags.power_setup_done || !pr->flags.power) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | drv->safe_state_index = -1; | |
dc2251bf | 1228 | for (i = ACPI_IDLE_STATE_START; i < CPUIDLE_STATE_MAX; i++) { |
a36a7fec SH |
1229 | drv->states[i].name[0] = '\0'; |
1230 | drv->states[i].desc[0] = '\0'; | |
1231 | } | |
1232 | ||
1233 | if (pr->flags.has_lpi) | |
1234 | return acpi_processor_setup_lpi_states(pr); | |
1235 | ||
1236 | return acpi_processor_setup_cstates(pr); | |
1237 | } | |
1238 | ||
1239 | /** | |
1240 | * acpi_processor_setup_cpuidle_dev - prepares and configures CPUIDLE | |
1241 | * device i.e. per-cpu data | |
1242 | * | |
1243 | * @pr: the ACPI processor | |
1244 | * @dev : the cpuidle device | |
1245 | */ | |
1246 | static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr, | |
1247 | struct cpuidle_device *dev) | |
1248 | { | |
1249 | if (!pr->flags.power_setup_done || !pr->flags.power || !dev) | |
1250 | return -EINVAL; | |
1251 | ||
1252 | dev->cpu = pr->id; | |
1253 | if (pr->flags.has_lpi) | |
1254 | return acpi_processor_ffh_lpi_probe(pr->id); | |
1255 | ||
1256 | return acpi_processor_setup_cpuidle_cx(pr, dev); | |
1257 | } | |
1258 | ||
1259 | static int acpi_processor_get_power_info(struct acpi_processor *pr) | |
1260 | { | |
1261 | int ret; | |
1262 | ||
1263 | ret = acpi_processor_get_lpi_info(pr); | |
1264 | if (ret) | |
1265 | ret = acpi_processor_get_cstate_info(pr); | |
1266 | ||
1267 | return ret; | |
1268 | } | |
1269 | ||
46bcfad7 | 1270 | int acpi_processor_hotplug(struct acpi_processor *pr) |
4f86d3a8 | 1271 | { |
dcb84f33 | 1272 | int ret = 0; |
e8b1b59d | 1273 | struct cpuidle_device *dev; |
4f86d3a8 | 1274 | |
d1896049 | 1275 | if (disabled_by_idle_boot_param()) |
36a91358 VP |
1276 | return 0; |
1277 | ||
4f86d3a8 LB |
1278 | if (!pr->flags.power_setup_done) |
1279 | return -ENODEV; | |
1280 | ||
e8b1b59d | 1281 | dev = per_cpu(acpi_cpuidle_device, pr->id); |
4f86d3a8 | 1282 | cpuidle_pause_and_lock(); |
3d339dcb | 1283 | cpuidle_disable_device(dev); |
a36a7fec SH |
1284 | ret = acpi_processor_get_power_info(pr); |
1285 | if (!ret && pr->flags.power) { | |
1286 | acpi_processor_setup_cpuidle_dev(pr, dev); | |
3d339dcb | 1287 | ret = cpuidle_enable_device(dev); |
dcb84f33 | 1288 | } |
4f86d3a8 LB |
1289 | cpuidle_resume_and_unlock(); |
1290 | ||
1291 | return ret; | |
1292 | } | |
1293 | ||
a36a7fec | 1294 | int acpi_processor_power_state_has_changed(struct acpi_processor *pr) |
46bcfad7 DD |
1295 | { |
1296 | int cpu; | |
1297 | struct acpi_processor *_pr; | |
3d339dcb | 1298 | struct cpuidle_device *dev; |
46bcfad7 DD |
1299 | |
1300 | if (disabled_by_idle_boot_param()) | |
1301 | return 0; | |
1302 | ||
46bcfad7 DD |
1303 | if (!pr->flags.power_setup_done) |
1304 | return -ENODEV; | |
1305 | ||
1306 | /* | |
1307 | * FIXME: Design the ACPI notification to make it once per | |
1308 | * system instead of once per-cpu. This condition is a hack | |
1309 | * to make the code that updates C-States be called once. | |
1310 | */ | |
1311 | ||
9505626d | 1312 | if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) { |
46bcfad7 | 1313 | |
46bcfad7 | 1314 | /* Protect against cpu-hotplug */ |
95ac7067 | 1315 | cpus_read_lock(); |
6726655d | 1316 | cpuidle_pause_and_lock(); |
46bcfad7 DD |
1317 | |
1318 | /* Disable all cpuidle devices */ | |
1319 | for_each_online_cpu(cpu) { | |
1320 | _pr = per_cpu(processors, cpu); | |
1321 | if (!_pr || !_pr->flags.power_setup_done) | |
1322 | continue; | |
3d339dcb DL |
1323 | dev = per_cpu(acpi_cpuidle_device, cpu); |
1324 | cpuidle_disable_device(dev); | |
46bcfad7 DD |
1325 | } |
1326 | ||
1327 | /* Populate Updated C-state information */ | |
f427e5f1 | 1328 | acpi_processor_get_power_info(pr); |
46bcfad7 DD |
1329 | acpi_processor_setup_cpuidle_states(pr); |
1330 | ||
1331 | /* Enable all cpuidle devices */ | |
1332 | for_each_online_cpu(cpu) { | |
1333 | _pr = per_cpu(processors, cpu); | |
1334 | if (!_pr || !_pr->flags.power_setup_done) | |
1335 | continue; | |
1336 | acpi_processor_get_power_info(_pr); | |
1337 | if (_pr->flags.power) { | |
3d339dcb | 1338 | dev = per_cpu(acpi_cpuidle_device, cpu); |
a36a7fec | 1339 | acpi_processor_setup_cpuidle_dev(_pr, dev); |
3d339dcb | 1340 | cpuidle_enable_device(dev); |
46bcfad7 DD |
1341 | } |
1342 | } | |
46bcfad7 | 1343 | cpuidle_resume_and_unlock(); |
95ac7067 | 1344 | cpus_read_unlock(); |
46bcfad7 DD |
1345 | } |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | static int acpi_processor_registered; | |
1351 | ||
fe7bf106 | 1352 | int acpi_processor_power_init(struct acpi_processor *pr) |
1da177e4 | 1353 | { |
46bcfad7 | 1354 | int retval; |
3d339dcb | 1355 | struct cpuidle_device *dev; |
1da177e4 | 1356 | |
d1896049 | 1357 | if (disabled_by_idle_boot_param()) |
36a91358 | 1358 | return 0; |
1da177e4 | 1359 | |
35ae7133 | 1360 | acpi_processor_cstate_first_run_checks(); |
1da177e4 | 1361 | |
35ae7133 SH |
1362 | if (!acpi_processor_get_power_info(pr)) |
1363 | pr->flags.power_setup_done = 1; | |
1da177e4 LT |
1364 | |
1365 | /* | |
1366 | * Install the idle handler if processor power management is supported. | |
1367 | * Note that we use previously set idle handler will be used on | |
1368 | * platforms that only support C1. | |
1369 | */ | |
36a91358 | 1370 | if (pr->flags.power) { |
46bcfad7 DD |
1371 | /* Register acpi_idle_driver if not already registered */ |
1372 | if (!acpi_processor_registered) { | |
1373 | acpi_processor_setup_cpuidle_states(pr); | |
1374 | retval = cpuidle_register_driver(&acpi_idle_driver); | |
1375 | if (retval) | |
1376 | return retval; | |
b6ec26fb SH |
1377 | pr_debug("%s registered with cpuidle\n", |
1378 | acpi_idle_driver.name); | |
46bcfad7 | 1379 | } |
3d339dcb DL |
1380 | |
1381 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1382 | if (!dev) | |
1383 | return -ENOMEM; | |
1384 | per_cpu(acpi_cpuidle_device, pr->id) = dev; | |
1385 | ||
a36a7fec | 1386 | acpi_processor_setup_cpuidle_dev(pr, dev); |
3d339dcb | 1387 | |
46bcfad7 DD |
1388 | /* Register per-cpu cpuidle_device. Cpuidle driver |
1389 | * must already be registered before registering device | |
1390 | */ | |
3d339dcb | 1391 | retval = cpuidle_register_device(dev); |
46bcfad7 DD |
1392 | if (retval) { |
1393 | if (acpi_processor_registered == 0) | |
1394 | cpuidle_unregister_driver(&acpi_idle_driver); | |
1395 | return retval; | |
1396 | } | |
1397 | acpi_processor_registered++; | |
1da177e4 | 1398 | } |
d550d98d | 1399 | return 0; |
1da177e4 LT |
1400 | } |
1401 | ||
38a991b6 | 1402 | int acpi_processor_power_exit(struct acpi_processor *pr) |
1da177e4 | 1403 | { |
3d339dcb DL |
1404 | struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id); |
1405 | ||
d1896049 | 1406 | if (disabled_by_idle_boot_param()) |
36a91358 VP |
1407 | return 0; |
1408 | ||
46bcfad7 | 1409 | if (pr->flags.power) { |
3d339dcb | 1410 | cpuidle_unregister_device(dev); |
46bcfad7 DD |
1411 | acpi_processor_registered--; |
1412 | if (acpi_processor_registered == 0) | |
1413 | cpuidle_unregister_driver(&acpi_idle_driver); | |
1414 | } | |
1da177e4 | 1415 | |
46bcfad7 | 1416 | pr->flags.power_setup_done = 0; |
d550d98d | 1417 | return 0; |
1da177e4 | 1418 | } |