Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * processor_throttling.c - Throttling submodule of 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> |
| 7 | * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> |
| 8 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
| 9 | * - Added processor hotplug support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/init.h> |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 16 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/cpufreq.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 18 | #include <linux/acpi.h> |
| 19 | #include <acpi/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/io.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 21 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Len Brown | a192a95 | 2009-07-28 16:45:54 -0400 | [diff] [blame] | 23 | #define PREFIX "ACPI: " |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #define ACPI_PROCESSOR_CLASS "processor" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 27 | ACPI_MODULE_NAME("processor_throttling"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Zhang Rui | 56c213f | 2009-05-11 09:35:57 +0800 | [diff] [blame] | 29 | /* ignore_tpc: |
| 30 | * 0 -> acpi processor driver doesn't ignore _TPC values |
| 31 | * 1 -> acpi processor driver ignores _TPC values |
| 32 | */ |
| 33 | static int ignore_tpc; |
| 34 | module_param(ignore_tpc, int, 0644); |
| 35 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); |
| 36 | |
Zhao Yakui | e4aa5cb | 2008-01-28 13:54:46 +0800 | [diff] [blame] | 37 | struct throttling_tstate { |
| 38 | unsigned int cpu; /* cpu nr */ |
| 39 | int target_state; /* target T-state */ |
| 40 | }; |
| 41 | |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 42 | struct acpi_processor_throttling_arg { |
| 43 | struct acpi_processor *pr; |
| 44 | int target_state; |
| 45 | bool force; |
| 46 | }; |
| 47 | |
Zhao Yakui | e4aa5cb | 2008-01-28 13:54:46 +0800 | [diff] [blame] | 48 | #define THROTTLING_PRECHANGE (1) |
| 49 | #define THROTTLING_POSTCHANGE (2) |
| 50 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 51 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 52 | static int __acpi_processor_set_throttling(struct acpi_processor *pr, |
| 53 | int state, bool force, bool direct); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 54 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 55 | static int acpi_processor_update_tsd_coord(void) |
| 56 | { |
| 57 | int count, count_target; |
| 58 | int retval = 0; |
| 59 | unsigned int i, j; |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 60 | cpumask_var_t covered_cpus; |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 61 | struct acpi_processor *pr, *match_pr; |
| 62 | struct acpi_tsd_package *pdomain, *match_pdomain; |
| 63 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; |
| 64 | |
Li Zefan | 79f5599 | 2009-06-15 14:58:26 +0800 | [diff] [blame] | 65 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 66 | return -ENOMEM; |
| 67 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 68 | /* |
| 69 | * Now that we have _TSD data from all CPUs, lets setup T-state |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 70 | * coordination between all CPUs. |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 71 | */ |
| 72 | for_each_possible_cpu(i) { |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 73 | pr = per_cpu(processors, i); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 74 | if (!pr) |
| 75 | continue; |
| 76 | |
| 77 | /* Basic validity check for domain info */ |
| 78 | pthrottling = &(pr->throttling); |
| 79 | |
| 80 | /* |
| 81 | * If tsd package for one cpu is invalid, the coordination |
| 82 | * among all CPUs is thought as invalid. |
| 83 | * Maybe it is ugly. |
| 84 | */ |
| 85 | if (!pthrottling->tsd_valid_flag) { |
| 86 | retval = -EINVAL; |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | if (retval) |
| 91 | goto err_ret; |
| 92 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 93 | for_each_possible_cpu(i) { |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 94 | pr = per_cpu(processors, i); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 95 | if (!pr) |
| 96 | continue; |
| 97 | |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 98 | if (cpumask_test_cpu(i, covered_cpus)) |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 99 | continue; |
| 100 | pthrottling = &pr->throttling; |
| 101 | |
| 102 | pdomain = &(pthrottling->domain_info); |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 103 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
| 104 | cpumask_set_cpu(i, covered_cpus); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 105 | /* |
| 106 | * If the number of processor in the TSD domain is 1, it is |
| 107 | * unnecessary to parse the coordination for this CPU. |
| 108 | */ |
| 109 | if (pdomain->num_processors <= 1) |
| 110 | continue; |
| 111 | |
| 112 | /* Validate the Domain info */ |
| 113 | count_target = pdomain->num_processors; |
| 114 | count = 1; |
| 115 | |
| 116 | for_each_possible_cpu(j) { |
| 117 | if (i == j) |
| 118 | continue; |
| 119 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 120 | match_pr = per_cpu(processors, j); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 121 | if (!match_pr) |
| 122 | continue; |
| 123 | |
| 124 | match_pthrottling = &(match_pr->throttling); |
| 125 | match_pdomain = &(match_pthrottling->domain_info); |
| 126 | if (match_pdomain->domain != pdomain->domain) |
| 127 | continue; |
| 128 | |
| 129 | /* Here i and j are in the same domain. |
| 130 | * If two TSD packages have the same domain, they |
| 131 | * should have the same num_porcessors and |
| 132 | * coordination type. Otherwise it will be regarded |
| 133 | * as illegal. |
| 134 | */ |
| 135 | if (match_pdomain->num_processors != count_target) { |
| 136 | retval = -EINVAL; |
| 137 | goto err_ret; |
| 138 | } |
| 139 | |
| 140 | if (pdomain->coord_type != match_pdomain->coord_type) { |
| 141 | retval = -EINVAL; |
| 142 | goto err_ret; |
| 143 | } |
| 144 | |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 145 | cpumask_set_cpu(j, covered_cpus); |
| 146 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 147 | count++; |
| 148 | } |
| 149 | for_each_possible_cpu(j) { |
| 150 | if (i == j) |
| 151 | continue; |
| 152 | |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 153 | match_pr = per_cpu(processors, j); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 154 | if (!match_pr) |
| 155 | continue; |
| 156 | |
| 157 | match_pthrottling = &(match_pr->throttling); |
| 158 | match_pdomain = &(match_pthrottling->domain_info); |
| 159 | if (match_pdomain->domain != pdomain->domain) |
| 160 | continue; |
| 161 | |
| 162 | /* |
| 163 | * If some CPUS have the same domain, they |
| 164 | * will have the same shared_cpu_map. |
| 165 | */ |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 166 | cpumask_copy(match_pthrottling->shared_cpu_map, |
| 167 | pthrottling->shared_cpu_map); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 168 | } |
| 169 | } |
| 170 | |
| 171 | err_ret: |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 172 | free_cpumask_var(covered_cpus); |
| 173 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 174 | for_each_possible_cpu(i) { |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 175 | pr = per_cpu(processors, i); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 176 | if (!pr) |
| 177 | continue; |
| 178 | |
| 179 | /* |
| 180 | * Assume no coordination on any error parsing domain info. |
| 181 | * The coordination type will be forced as SW_ALL. |
| 182 | */ |
| 183 | if (retval) { |
| 184 | pthrottling = &(pr->throttling); |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 185 | cpumask_clear(pthrottling->shared_cpu_map); |
| 186 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 187 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | return retval; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Update the T-state coordination after the _TSD |
| 196 | * data for all cpus is obtained. |
| 197 | */ |
| 198 | void acpi_processor_throttling_init(void) |
| 199 | { |
Andy Shevchenko | 2d5914c | 2013-03-11 09:17:05 +0000 | [diff] [blame] | 200 | if (acpi_processor_update_tsd_coord()) { |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 201 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 202 | "Assume no T-state coordination\n")); |
Andy Shevchenko | 2d5914c | 2013-03-11 09:17:05 +0000 | [diff] [blame] | 203 | } |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 204 | |
| 205 | return; |
| 206 | } |
| 207 | |
Zhao Yakui | e4aa5cb | 2008-01-28 13:54:46 +0800 | [diff] [blame] | 208 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
| 209 | { |
| 210 | struct throttling_tstate *p_tstate = data; |
| 211 | struct acpi_processor *pr; |
| 212 | unsigned int cpu ; |
| 213 | int target_state; |
| 214 | struct acpi_processor_limit *p_limit; |
| 215 | struct acpi_processor_throttling *p_throttling; |
| 216 | |
| 217 | cpu = p_tstate->cpu; |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 218 | pr = per_cpu(processors, cpu); |
Zhao Yakui | e4aa5cb | 2008-01-28 13:54:46 +0800 | [diff] [blame] | 219 | if (!pr) { |
| 220 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); |
| 221 | return 0; |
| 222 | } |
| 223 | if (!pr->flags.throttling) { |
| 224 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " |
| 225 | "unsupported on CPU %d\n", cpu)); |
| 226 | return 0; |
| 227 | } |
| 228 | target_state = p_tstate->target_state; |
| 229 | p_throttling = &(pr->throttling); |
| 230 | switch (event) { |
| 231 | case THROTTLING_PRECHANGE: |
| 232 | /* |
| 233 | * Prechange event is used to choose one proper t-state, |
| 234 | * which meets the limits of thermal, user and _TPC. |
| 235 | */ |
| 236 | p_limit = &pr->limit; |
| 237 | if (p_limit->thermal.tx > target_state) |
| 238 | target_state = p_limit->thermal.tx; |
| 239 | if (p_limit->user.tx > target_state) |
| 240 | target_state = p_limit->user.tx; |
| 241 | if (pr->throttling_platform_limit > target_state) |
| 242 | target_state = pr->throttling_platform_limit; |
| 243 | if (target_state >= p_throttling->state_count) { |
| 244 | printk(KERN_WARNING |
| 245 | "Exceed the limit of T-state \n"); |
| 246 | target_state = p_throttling->state_count - 1; |
| 247 | } |
| 248 | p_tstate->target_state = target_state; |
| 249 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" |
| 250 | "target T-state of CPU %d is T%d\n", |
| 251 | cpu, target_state)); |
| 252 | break; |
| 253 | case THROTTLING_POSTCHANGE: |
| 254 | /* |
| 255 | * Postchange event is only used to update the |
| 256 | * T-state flag of acpi_processor_throttling. |
| 257 | */ |
| 258 | p_throttling->state = target_state; |
| 259 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" |
| 260 | "CPU %d is switched to T%d\n", |
| 261 | cpu, target_state)); |
| 262 | break; |
| 263 | default: |
| 264 | printk(KERN_WARNING |
| 265 | "Unsupported Throttling notifier event\n"); |
| 266 | break; |
| 267 | } |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 272 | /* |
| 273 | * _TPC - Throttling Present Capabilities |
| 274 | */ |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 275 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
| 276 | { |
| 277 | acpi_status status = 0; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 278 | unsigned long long tpc = 0; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 279 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 280 | if (!pr) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 281 | return -EINVAL; |
Zhang Rui | 56c213f | 2009-05-11 09:35:57 +0800 | [diff] [blame] | 282 | |
| 283 | if (ignore_tpc) |
| 284 | goto end; |
| 285 | |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 286 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 287 | if (ACPI_FAILURE(status)) { |
| 288 | if (status != AE_NOT_FOUND) { |
| 289 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); |
| 290 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 291 | return -ENODEV; |
| 292 | } |
Zhang Rui | 56c213f | 2009-05-11 09:35:57 +0800 | [diff] [blame] | 293 | |
| 294 | end: |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 295 | pr->throttling_platform_limit = (int)tpc; |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) |
| 300 | { |
Zhao Yakui | ef54d5a | 2007-11-15 16:59:30 +0800 | [diff] [blame] | 301 | int result = 0; |
| 302 | int throttling_limit; |
| 303 | int current_state; |
| 304 | struct acpi_processor_limit *limit; |
| 305 | int target_state; |
| 306 | |
Zhang Rui | 56c213f | 2009-05-11 09:35:57 +0800 | [diff] [blame] | 307 | if (ignore_tpc) |
| 308 | return 0; |
| 309 | |
Zhao Yakui | ef54d5a | 2007-11-15 16:59:30 +0800 | [diff] [blame] | 310 | result = acpi_processor_get_platform_limit(pr); |
| 311 | if (result) { |
| 312 | /* Throttling Limit is unsupported */ |
| 313 | return result; |
| 314 | } |
| 315 | |
| 316 | throttling_limit = pr->throttling_platform_limit; |
| 317 | if (throttling_limit >= pr->throttling.state_count) { |
| 318 | /* Uncorrect Throttling Limit */ |
| 319 | return -EINVAL; |
| 320 | } |
| 321 | |
| 322 | current_state = pr->throttling.state; |
| 323 | if (current_state > throttling_limit) { |
| 324 | /* |
| 325 | * The current state can meet the requirement of |
| 326 | * _TPC limit. But it is reasonable that OSPM changes |
| 327 | * t-states from high to low for better performance. |
| 328 | * Of course the limit condition of thermal |
| 329 | * and user should be considered. |
| 330 | */ |
| 331 | limit = &pr->limit; |
| 332 | target_state = throttling_limit; |
| 333 | if (limit->thermal.tx > target_state) |
| 334 | target_state = limit->thermal.tx; |
| 335 | if (limit->user.tx > target_state) |
| 336 | target_state = limit->user.tx; |
| 337 | } else if (current_state == throttling_limit) { |
| 338 | /* |
| 339 | * Unnecessary to change the throttling state |
| 340 | */ |
| 341 | return 0; |
| 342 | } else { |
| 343 | /* |
| 344 | * If the current state is lower than the limit of _TPC, it |
| 345 | * will be forced to switch to the throttling state defined |
| 346 | * by throttling_platfor_limit. |
| 347 | * Because the previous state meets with the limit condition |
| 348 | * of thermal and user, it is unnecessary to check it again. |
| 349 | */ |
| 350 | target_state = throttling_limit; |
| 351 | } |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 352 | return acpi_processor_set_throttling(pr, target_state, false); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 353 | } |
| 354 | |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 355 | /* |
Zhao Yakui | 5a344a5 | 2011-01-10 16:35:45 +0800 | [diff] [blame] | 356 | * This function is used to reevaluate whether the T-state is valid |
| 357 | * after one CPU is onlined/offlined. |
| 358 | * It is noted that it won't reevaluate the following properties for |
| 359 | * the T-state. |
| 360 | * 1. Control method. |
| 361 | * 2. the number of supported T-state |
| 362 | * 3. TSD domain |
| 363 | */ |
| 364 | void acpi_processor_reevaluate_tstate(struct acpi_processor *pr, |
Sebastian Andrzej Siewior | 64f3bf2 | 2016-09-06 19:04:47 +0200 | [diff] [blame] | 365 | bool is_dead) |
Zhao Yakui | 5a344a5 | 2011-01-10 16:35:45 +0800 | [diff] [blame] | 366 | { |
| 367 | int result = 0; |
| 368 | |
Sebastian Andrzej Siewior | 64f3bf2 | 2016-09-06 19:04:47 +0200 | [diff] [blame] | 369 | if (is_dead) { |
Zhao Yakui | 5a344a5 | 2011-01-10 16:35:45 +0800 | [diff] [blame] | 370 | /* When one CPU is offline, the T-state throttling |
| 371 | * will be invalidated. |
| 372 | */ |
| 373 | pr->flags.throttling = 0; |
| 374 | return; |
| 375 | } |
| 376 | /* the following is to recheck whether the T-state is valid for |
| 377 | * the online CPU |
| 378 | */ |
| 379 | if (!pr->throttling.state_count) { |
| 380 | /* If the number of T-state is invalid, it is |
| 381 | * invalidated. |
| 382 | */ |
| 383 | pr->flags.throttling = 0; |
| 384 | return; |
| 385 | } |
| 386 | pr->flags.throttling = 1; |
| 387 | |
| 388 | /* Disable throttling (if enabled). We'll let subsequent |
| 389 | * policy (e.g.thermal) decide to lower performance if it |
| 390 | * so chooses, but for now we'll crank up the speed. |
| 391 | */ |
| 392 | |
| 393 | result = acpi_processor_get_throttling(pr); |
| 394 | if (result) |
| 395 | goto end; |
| 396 | |
| 397 | if (pr->throttling.state) { |
| 398 | result = acpi_processor_set_throttling(pr, 0, false); |
| 399 | if (result) |
| 400 | goto end; |
| 401 | } |
| 402 | |
| 403 | end: |
| 404 | if (result) |
| 405 | pr->flags.throttling = 0; |
| 406 | } |
| 407 | /* |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 408 | * _PTC - Processor Throttling Control (and status) register location |
| 409 | */ |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 410 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
| 411 | { |
| 412 | int result = 0; |
| 413 | acpi_status status = 0; |
| 414 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 415 | union acpi_object *ptc = NULL; |
| 416 | union acpi_object obj = { 0 }; |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 417 | struct acpi_processor_throttling *throttling; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 418 | |
| 419 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); |
| 420 | if (ACPI_FAILURE(status)) { |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 421 | if (status != AE_NOT_FOUND) { |
| 422 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); |
| 423 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 424 | return -ENODEV; |
| 425 | } |
| 426 | |
| 427 | ptc = (union acpi_object *)buffer.pointer; |
| 428 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) |
| 429 | || (ptc->package.count != 2)) { |
| 430 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); |
| 431 | result = -EFAULT; |
| 432 | goto end; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * control_register |
| 437 | */ |
| 438 | |
| 439 | obj = ptc->package.elements[0]; |
| 440 | |
| 441 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 442 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) |
| 443 | || (obj.buffer.pointer == NULL)) { |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 444 | printk(KERN_ERR PREFIX |
| 445 | "Invalid _PTC data (control_register)\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 446 | result = -EFAULT; |
| 447 | goto end; |
| 448 | } |
| 449 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, |
| 450 | sizeof(struct acpi_ptc_register)); |
| 451 | |
| 452 | /* |
| 453 | * status_register |
| 454 | */ |
| 455 | |
| 456 | obj = ptc->package.elements[1]; |
| 457 | |
| 458 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 459 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) |
| 460 | || (obj.buffer.pointer == NULL)) { |
| 461 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); |
| 462 | result = -EFAULT; |
| 463 | goto end; |
| 464 | } |
| 465 | |
| 466 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 467 | sizeof(struct acpi_ptc_register)); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 468 | |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 469 | throttling = &pr->throttling; |
| 470 | |
| 471 | if ((throttling->control_register.bit_width + |
| 472 | throttling->control_register.bit_offset) > 32) { |
| 473 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); |
| 474 | result = -EFAULT; |
| 475 | goto end; |
| 476 | } |
| 477 | |
| 478 | if ((throttling->status_register.bit_width + |
| 479 | throttling->status_register.bit_offset) > 32) { |
| 480 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); |
| 481 | result = -EFAULT; |
| 482 | goto end; |
| 483 | } |
| 484 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 485 | end: |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 486 | kfree(buffer.pointer); |
| 487 | |
| 488 | return result; |
| 489 | } |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 490 | |
| 491 | /* |
| 492 | * _TSS - Throttling Supported States |
| 493 | */ |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 494 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
| 495 | { |
| 496 | int result = 0; |
| 497 | acpi_status status = AE_OK; |
| 498 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 499 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; |
| 500 | struct acpi_buffer state = { 0, NULL }; |
| 501 | union acpi_object *tss = NULL; |
| 502 | int i; |
| 503 | |
| 504 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); |
| 505 | if (ACPI_FAILURE(status)) { |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 506 | if (status != AE_NOT_FOUND) { |
| 507 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); |
| 508 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 509 | return -ENODEV; |
| 510 | } |
| 511 | |
| 512 | tss = buffer.pointer; |
| 513 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { |
| 514 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); |
| 515 | result = -EFAULT; |
| 516 | goto end; |
| 517 | } |
| 518 | |
| 519 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
| 520 | tss->package.count)); |
| 521 | |
| 522 | pr->throttling.state_count = tss->package.count; |
| 523 | pr->throttling.states_tss = |
Kees Cook | 6da2ec5 | 2018-06-12 13:55:00 -0700 | [diff] [blame] | 524 | kmalloc_array(tss->package.count, |
| 525 | sizeof(struct acpi_processor_tx_tss), |
| 526 | GFP_KERNEL); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 527 | if (!pr->throttling.states_tss) { |
| 528 | result = -ENOMEM; |
| 529 | goto end; |
| 530 | } |
| 531 | |
| 532 | for (i = 0; i < pr->throttling.state_count; i++) { |
| 533 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 534 | struct acpi_processor_tx_tss *tx = |
| 535 | (struct acpi_processor_tx_tss *)&(pr->throttling. |
| 536 | states_tss[i]); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 537 | |
| 538 | state.length = sizeof(struct acpi_processor_tx_tss); |
| 539 | state.pointer = tx; |
| 540 | |
| 541 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); |
| 542 | |
| 543 | status = acpi_extract_package(&(tss->package.elements[i]), |
| 544 | &format, &state); |
| 545 | if (ACPI_FAILURE(status)) { |
| 546 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); |
| 547 | result = -EFAULT; |
| 548 | kfree(pr->throttling.states_tss); |
| 549 | goto end; |
| 550 | } |
| 551 | |
| 552 | if (!tx->freqpercentage) { |
| 553 | printk(KERN_ERR PREFIX |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 554 | "Invalid _TSS data: freq is zero\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 555 | result = -EFAULT; |
| 556 | kfree(pr->throttling.states_tss); |
| 557 | goto end; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | end: |
| 562 | kfree(buffer.pointer); |
| 563 | |
| 564 | return result; |
| 565 | } |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 566 | |
| 567 | /* |
| 568 | * _TSD - T-State Dependencies |
| 569 | */ |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 570 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 571 | { |
| 572 | int result = 0; |
| 573 | acpi_status status = AE_OK; |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 574 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 575 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; |
| 576 | struct acpi_buffer state = { 0, NULL }; |
| 577 | union acpi_object *tsd = NULL; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 578 | struct acpi_tsd_package *pdomain; |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 579 | struct acpi_processor_throttling *pthrottling; |
| 580 | |
| 581 | pthrottling = &pr->throttling; |
| 582 | pthrottling->tsd_valid_flag = 0; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 583 | |
| 584 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); |
| 585 | if (ACPI_FAILURE(status)) { |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 586 | if (status != AE_NOT_FOUND) { |
| 587 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); |
| 588 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 589 | return -ENODEV; |
| 590 | } |
| 591 | |
| 592 | tsd = buffer.pointer; |
| 593 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame] | 594 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 595 | result = -EFAULT; |
| 596 | goto end; |
| 597 | } |
| 598 | |
| 599 | if (tsd->package.count != 1) { |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame] | 600 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 601 | result = -EFAULT; |
| 602 | goto end; |
| 603 | } |
| 604 | |
| 605 | pdomain = &(pr->throttling.domain_info); |
| 606 | |
| 607 | state.length = sizeof(struct acpi_tsd_package); |
| 608 | state.pointer = pdomain; |
| 609 | |
| 610 | status = acpi_extract_package(&(tsd->package.elements[0]), |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 611 | &format, &state); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 612 | if (ACPI_FAILURE(status)) { |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame] | 613 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 614 | result = -EFAULT; |
| 615 | goto end; |
| 616 | } |
| 617 | |
| 618 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame] | 619 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 620 | result = -EFAULT; |
| 621 | goto end; |
| 622 | } |
| 623 | |
| 624 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { |
Lin Ming | 55ac9a0 | 2008-09-28 14:51:56 +0800 | [diff] [blame] | 625 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 626 | result = -EFAULT; |
| 627 | goto end; |
| 628 | } |
| 629 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 630 | pthrottling = &pr->throttling; |
| 631 | pthrottling->tsd_valid_flag = 1; |
| 632 | pthrottling->shared_type = pdomain->coord_type; |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 633 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 634 | /* |
| 635 | * If the coordination type is not defined in ACPI spec, |
| 636 | * the tsd_valid_flag will be clear and coordination type |
| 637 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. |
| 638 | */ |
| 639 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
| 640 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && |
| 641 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { |
| 642 | pthrottling->tsd_valid_flag = 0; |
| 643 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
| 644 | } |
| 645 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 646 | end: |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 647 | kfree(buffer.pointer); |
| 648 | return result; |
| 649 | } |
| 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | /* -------------------------------------------------------------------------- |
| 652 | Throttling Control |
| 653 | -------------------------------------------------------------------------- */ |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 654 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 656 | int state = 0; |
| 657 | u32 value = 0; |
| 658 | u32 duty_mask = 0; |
| 659 | u32 duty_value = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 662 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
| 664 | if (!pr->flags.throttling) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 665 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Rafael J. Wysocki | 8631475 | 2016-06-02 01:57:50 +0200 | [diff] [blame] | 667 | /* |
| 668 | * We don't care about error returns - we just try to mark |
| 669 | * these reserved so that nobody else is confused into thinking |
| 670 | * that this region might be unused.. |
| 671 | * |
| 672 | * (In particular, allocating the IO range for Cardbus) |
| 673 | */ |
| 674 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | pr->throttling.state = 0; |
| 677 | |
| 678 | duty_mask = pr->throttling.state_count - 1; |
| 679 | |
| 680 | duty_mask <<= pr->throttling.duty_offset; |
| 681 | |
| 682 | local_irq_disable(); |
| 683 | |
| 684 | value = inl(pr->throttling.address); |
| 685 | |
| 686 | /* |
| 687 | * Compute the current throttling state when throttling is enabled |
| 688 | * (bit 4 is on). |
| 689 | */ |
| 690 | if (value & 0x10) { |
| 691 | duty_value = value & duty_mask; |
| 692 | duty_value >>= pr->throttling.duty_offset; |
| 693 | |
| 694 | if (duty_value) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 695 | state = pr->throttling.state_count - duty_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | pr->throttling.state = state; |
| 699 | |
| 700 | local_irq_enable(); |
| 701 | |
| 702 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 703 | "Throttling state is T%d (%d%% throttling applied)\n", |
| 704 | state, pr->throttling.states[state].performance)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 706 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | } |
| 708 | |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 709 | #ifdef CONFIG_X86 |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 710 | static int acpi_throttling_rdmsr(u64 *value) |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 711 | { |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 712 | u64 msr_high, msr_low; |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 713 | u64 msr = 0; |
| 714 | int ret = -1; |
| 715 | |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 716 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
| 717 | !this_cpu_has(X86_FEATURE_ACPI)) { |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 718 | printk(KERN_ERR PREFIX |
| 719 | "HARDWARE addr space,NOT supported yet\n"); |
| 720 | } else { |
| 721 | msr_low = 0; |
| 722 | msr_high = 0; |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 723 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 724 | (u32 *)&msr_low , (u32 *) &msr_high); |
| 725 | msr = (msr_high << 32) | msr_low; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 726 | *value = (u64) msr; |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 727 | ret = 0; |
| 728 | } |
| 729 | return ret; |
| 730 | } |
| 731 | |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 732 | static int acpi_throttling_wrmsr(u64 value) |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 733 | { |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 734 | int ret = -1; |
| 735 | u64 msr; |
| 736 | |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 737 | if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) || |
| 738 | !this_cpu_has(X86_FEATURE_ACPI)) { |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 739 | printk(KERN_ERR PREFIX |
| 740 | "HARDWARE addr space,NOT supported yet\n"); |
| 741 | } else { |
| 742 | msr = value; |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 743 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 744 | msr & 0xffffffff, msr >> 32); |
| 745 | ret = 0; |
| 746 | } |
| 747 | return ret; |
| 748 | } |
| 749 | #else |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 750 | static int acpi_throttling_rdmsr(u64 *value) |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 751 | { |
| 752 | printk(KERN_ERR PREFIX |
| 753 | "HARDWARE addr space,NOT supported yet\n"); |
| 754 | return -1; |
| 755 | } |
| 756 | |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 757 | static int acpi_throttling_wrmsr(u64 value) |
Zhao Yakui | f79f06a | 2007-11-15 17:06:36 +0800 | [diff] [blame] | 758 | { |
| 759 | printk(KERN_ERR PREFIX |
| 760 | "HARDWARE addr space,NOT supported yet\n"); |
| 761 | return -1; |
| 762 | } |
| 763 | #endif |
| 764 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 765 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 766 | u64 *value) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 767 | { |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 768 | u32 bit_width, bit_offset; |
Dan Carpenter | 344e222 | 2012-03-07 14:57:36 +0300 | [diff] [blame] | 769 | u32 ptc_value; |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 770 | u64 ptc_mask; |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 771 | struct acpi_processor_throttling *throttling; |
| 772 | int ret = -1; |
| 773 | |
| 774 | throttling = &pr->throttling; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 775 | switch (throttling->status_register.space_id) { |
| 776 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 777 | bit_width = throttling->status_register.bit_width; |
| 778 | bit_offset = throttling->status_register.bit_offset; |
| 779 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 780 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
Dan Carpenter | 344e222 | 2012-03-07 14:57:36 +0300 | [diff] [blame] | 781 | address, &ptc_value, |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 782 | (u32) (bit_width + bit_offset)); |
| 783 | ptc_mask = (1 << bit_width) - 1; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 784 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 785 | ret = 0; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 786 | break; |
| 787 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 788 | ret = acpi_throttling_rdmsr(value); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 789 | break; |
| 790 | default: |
| 791 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 792 | (u32) (throttling->status_register.space_id)); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 793 | } |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 794 | return ret; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 795 | } |
| 796 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 797 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 798 | u64 value) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 799 | { |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 800 | u32 bit_width, bit_offset; |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 801 | u64 ptc_value; |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 802 | u64 ptc_mask; |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 803 | struct acpi_processor_throttling *throttling; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 804 | int ret = -1; |
| 805 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 806 | throttling = &pr->throttling; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 807 | switch (throttling->control_register.space_id) { |
| 808 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 809 | bit_width = throttling->control_register.bit_width; |
| 810 | bit_offset = throttling->control_register.bit_offset; |
| 811 | ptc_mask = (1 << bit_width) - 1; |
| 812 | ptc_value = value & ptc_mask; |
| 813 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 814 | acpi_os_write_port((acpi_io_address) throttling-> |
Zhao Yakui | 9bcb272 | 2007-11-15 17:05:05 +0800 | [diff] [blame] | 815 | control_register.address, |
| 816 | (u32) (ptc_value << bit_offset), |
| 817 | (u32) (bit_width + bit_offset)); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 818 | ret = 0; |
| 819 | break; |
| 820 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Christoph Lameter | 9d42a53 | 2011-03-12 12:51:12 +0100 | [diff] [blame] | 821 | ret = acpi_throttling_wrmsr(value); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 822 | break; |
| 823 | default: |
| 824 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 825 | (u32) (throttling->control_register.space_id)); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 826 | } |
| 827 | return ret; |
| 828 | } |
| 829 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 830 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 831 | u64 value) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 832 | { |
| 833 | int i; |
| 834 | |
| 835 | for (i = 0; i < pr->throttling.state_count; i++) { |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 836 | struct acpi_processor_tx_tss *tx = |
| 837 | (struct acpi_processor_tx_tss *)&(pr->throttling. |
| 838 | states_tss[i]); |
| 839 | if (tx->control == value) |
Len Brown | 53af9cf | 2009-03-15 23:36:38 -0400 | [diff] [blame] | 840 | return i; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 841 | } |
Len Brown | 53af9cf | 2009-03-15 23:36:38 -0400 | [diff] [blame] | 842 | return -1; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 843 | } |
| 844 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 845 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 846 | int state, u64 *value) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 847 | { |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 848 | int ret = -1; |
| 849 | |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 850 | if (state >= 0 && state <= pr->throttling.state_count) { |
| 851 | struct acpi_processor_tx_tss *tx = |
| 852 | (struct acpi_processor_tx_tss *)&(pr->throttling. |
| 853 | states_tss[state]); |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 854 | *value = tx->control; |
| 855 | ret = 0; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 856 | } |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 857 | return ret; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 858 | } |
| 859 | |
| 860 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) |
| 861 | { |
| 862 | int state = 0; |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 863 | int ret; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 864 | u64 value; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 865 | |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 866 | if (!pr) |
| 867 | return -EINVAL; |
| 868 | |
| 869 | if (!pr->flags.throttling) |
| 870 | return -ENODEV; |
| 871 | |
| 872 | pr->throttling.state = 0; |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 873 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 874 | value = 0; |
| 875 | ret = acpi_read_throttling_status(pr, &value); |
| 876 | if (ret >= 0) { |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 877 | state = acpi_get_throttling_state(pr, value); |
Zhang Rui | 4973b22 | 2009-05-11 09:36:01 +0800 | [diff] [blame] | 878 | if (state == -1) { |
Frans Pop | bdf57de | 2009-08-26 14:29:30 -0700 | [diff] [blame] | 879 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 880 | "Invalid throttling state, reset\n")); |
Zhang Rui | 4973b22 | 2009-05-11 09:36:01 +0800 | [diff] [blame] | 881 | state = 0; |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 882 | ret = __acpi_processor_set_throttling(pr, state, true, |
| 883 | true); |
Zhang Rui | 4973b22 | 2009-05-11 09:36:01 +0800 | [diff] [blame] | 884 | if (ret) |
| 885 | return ret; |
| 886 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 887 | pr->throttling.state = state; |
| 888 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 889 | |
| 890 | return 0; |
| 891 | } |
| 892 | |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 893 | static long __acpi_processor_get_throttling(void *data) |
| 894 | { |
| 895 | struct acpi_processor *pr = data; |
| 896 | |
| 897 | return pr->throttling.acpi_processor_get_throttling(pr); |
| 898 | } |
| 899 | |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 900 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
| 901 | { |
Zhao Yakui | 8765427 | 2008-01-28 13:53:30 +0800 | [diff] [blame] | 902 | if (!pr) |
| 903 | return -EINVAL; |
| 904 | |
| 905 | if (!pr->flags.throttling) |
| 906 | return -ENODEV; |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 907 | |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 908 | /* |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 909 | * This is either called from the CPU hotplug callback of |
| 910 | * processor_driver or via the ACPI probe function. In the latter |
| 911 | * case the CPU is not guaranteed to be online. Both call sites are |
| 912 | * protected against CPU hotplug. |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 913 | */ |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 914 | if (!cpu_online(pr->id)) |
Zhao Yakui | daef1f35 | 2011-01-10 16:35:44 +0800 | [diff] [blame] | 915 | return -ENODEV; |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 916 | |
Thomas Gleixner | 0266d81 | 2017-05-24 10:15:42 +0200 | [diff] [blame] | 917 | return call_on_cpu(pr->id, __acpi_processor_get_throttling, pr, false); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 918 | } |
| 919 | |
Zhao Yakui | 22cc501 | 2007-11-15 17:02:03 +0800 | [diff] [blame] | 920 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
| 921 | { |
| 922 | int i, step; |
| 923 | |
| 924 | if (!pr->throttling.address) { |
| 925 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); |
| 926 | return -EINVAL; |
| 927 | } else if (!pr->throttling.duty_width) { |
| 928 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); |
| 929 | return -EINVAL; |
| 930 | } |
| 931 | /* TBD: Support duty_cycle values that span bit 4. */ |
| 932 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { |
| 933 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); |
| 934 | return -EINVAL; |
| 935 | } |
| 936 | |
| 937 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; |
| 938 | |
| 939 | /* |
| 940 | * Compute state values. Note that throttling displays a linear power |
| 941 | * performance relationship (at 50% performance the CPU will consume |
| 942 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. |
| 943 | */ |
| 944 | |
| 945 | step = (1000 / pr->throttling.state_count); |
| 946 | |
| 947 | for (i = 0; i < pr->throttling.state_count; i++) { |
| 948 | pr->throttling.states[i].performance = 1000 - step * i; |
| 949 | pr->throttling.states[i].power = 1000 - step * i; |
| 950 | } |
| 951 | return 0; |
| 952 | } |
| 953 | |
Adrian Bunk | 6c5cf8a | 2007-07-03 00:53:12 -0400 | [diff] [blame] | 954 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 955 | int state, bool force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 957 | u32 value = 0; |
| 958 | u32 duty_mask = 0; |
| 959 | u32 duty_value = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | if (!pr) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 962 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 965 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | if (!pr->flags.throttling) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 968 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 970 | if (!force && (state == pr->throttling.state)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 971 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 973 | if (state < pr->throttling_platform_limit) |
| 974 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | /* |
| 976 | * Calculate the duty_value and duty_mask. |
| 977 | */ |
| 978 | if (state) { |
| 979 | duty_value = pr->throttling.state_count - state; |
| 980 | |
| 981 | duty_value <<= pr->throttling.duty_offset; |
| 982 | |
| 983 | /* Used to clear all duty_value bits */ |
| 984 | duty_mask = pr->throttling.state_count - 1; |
| 985 | |
Alexey Starikovskiy | cee324b | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 986 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | duty_mask = ~duty_mask; |
| 988 | } |
| 989 | |
| 990 | local_irq_disable(); |
| 991 | |
| 992 | /* |
| 993 | * Disable throttling by writing a 0 to bit 4. Note that we must |
| 994 | * turn it off before you can change the duty_value. |
| 995 | */ |
| 996 | value = inl(pr->throttling.address); |
| 997 | if (value & 0x10) { |
| 998 | value &= 0xFFFFFFEF; |
| 999 | outl(value, pr->throttling.address); |
| 1000 | } |
| 1001 | |
| 1002 | /* |
| 1003 | * Write the new duty_value and then enable throttling. Note |
| 1004 | * that a state value of 0 leaves throttling disabled. |
| 1005 | */ |
| 1006 | if (state) { |
| 1007 | value &= duty_mask; |
| 1008 | value |= duty_value; |
| 1009 | outl(value, pr->throttling.address); |
| 1010 | |
| 1011 | value |= 0x00000010; |
| 1012 | outl(value, pr->throttling.address); |
| 1013 | } |
| 1014 | |
| 1015 | pr->throttling.state = state; |
| 1016 | |
| 1017 | local_irq_enable(); |
| 1018 | |
| 1019 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1020 | "Throttling state set to T%d (%d%%)\n", state, |
| 1021 | (pr->throttling.states[state].performance ? pr-> |
| 1022 | throttling.states[state].performance / 10 : 0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1024 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | } |
| 1026 | |
Adrian Bunk | 6c5cf8a | 2007-07-03 00:53:12 -0400 | [diff] [blame] | 1027 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 1028 | int state, bool force) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1029 | { |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 1030 | int ret; |
Lin Ming | 439913f | 2010-01-28 10:53:19 +0800 | [diff] [blame] | 1031 | u64 value; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1032 | |
| 1033 | if (!pr) |
| 1034 | return -EINVAL; |
| 1035 | |
| 1036 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) |
| 1037 | return -EINVAL; |
| 1038 | |
| 1039 | if (!pr->flags.throttling) |
| 1040 | return -ENODEV; |
| 1041 | |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 1042 | if (!force && (state == pr->throttling.state)) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1043 | return 0; |
| 1044 | |
| 1045 | if (state < pr->throttling_platform_limit) |
| 1046 | return -EPERM; |
| 1047 | |
Zhao Yakui | 0753f6e | 2007-11-15 17:03:46 +0800 | [diff] [blame] | 1048 | value = 0; |
| 1049 | ret = acpi_get_throttling_value(pr, state, &value); |
| 1050 | if (ret >= 0) { |
| 1051 | acpi_write_throttling_state(pr, value); |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1052 | pr->throttling.state = state; |
| 1053 | } |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1058 | static long acpi_processor_throttling_fn(void *data) |
| 1059 | { |
| 1060 | struct acpi_processor_throttling_arg *arg = data; |
| 1061 | struct acpi_processor *pr = arg->pr; |
| 1062 | |
| 1063 | return pr->throttling.acpi_processor_set_throttling(pr, |
| 1064 | arg->target_state, arg->force); |
| 1065 | } |
| 1066 | |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 1067 | static int __acpi_processor_set_throttling(struct acpi_processor *pr, |
| 1068 | int state, bool force, bool direct) |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1069 | { |
Len Brown | 3391a76 | 2008-02-02 03:56:18 -0500 | [diff] [blame] | 1070 | int ret = 0; |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1071 | unsigned int i; |
| 1072 | struct acpi_processor *match_pr; |
| 1073 | struct acpi_processor_throttling *p_throttling; |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1074 | struct acpi_processor_throttling_arg arg; |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1075 | struct throttling_tstate t_state; |
Zhao Yakui | 8765427 | 2008-01-28 13:53:30 +0800 | [diff] [blame] | 1076 | |
| 1077 | if (!pr) |
| 1078 | return -EINVAL; |
| 1079 | |
| 1080 | if (!pr->flags.throttling) |
| 1081 | return -ENODEV; |
| 1082 | |
| 1083 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) |
| 1084 | return -EINVAL; |
| 1085 | |
Zhao Yakui | daef1f35 | 2011-01-10 16:35:44 +0800 | [diff] [blame] | 1086 | if (cpu_is_offline(pr->id)) { |
| 1087 | /* |
| 1088 | * the cpu pointed by pr->id is offline. Unnecessary to change |
| 1089 | * the throttling state any more. |
| 1090 | */ |
| 1091 | return -ENODEV; |
| 1092 | } |
| 1093 | |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1094 | t_state.target_state = state; |
| 1095 | p_throttling = &(pr->throttling); |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1096 | |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1097 | /* |
| 1098 | * The throttling notifier will be called for every |
| 1099 | * affected cpu in order to get one proper T-state. |
| 1100 | * The notifier event is THROTTLING_PRECHANGE. |
| 1101 | */ |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1102 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1103 | t_state.cpu = i; |
| 1104 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, |
| 1105 | &t_state); |
| 1106 | } |
| 1107 | /* |
| 1108 | * The function of acpi_processor_set_throttling will be called |
| 1109 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, |
| 1110 | * it is necessary to call it for every affected cpu. Otherwise |
| 1111 | * it can be called only for the cpu pointed by pr. |
| 1112 | */ |
| 1113 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1114 | arg.pr = pr; |
| 1115 | arg.target_state = state; |
| 1116 | arg.force = force; |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 1117 | ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg, |
| 1118 | direct); |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1119 | } else { |
| 1120 | /* |
| 1121 | * When the T-state coordination is SW_ALL or HW_ALL, |
| 1122 | * it is necessary to set T-state for every affected |
| 1123 | * cpus. |
| 1124 | */ |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1125 | for_each_cpu_and(i, cpu_online_mask, |
| 1126 | p_throttling->shared_cpu_map) { |
Mike Travis | 706546d | 2008-06-09 16:22:23 -0700 | [diff] [blame] | 1127 | match_pr = per_cpu(processors, i); |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1128 | /* |
| 1129 | * If the pointer is invalid, we will report the |
| 1130 | * error message and continue. |
| 1131 | */ |
| 1132 | if (!match_pr) { |
| 1133 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1134 | "Invalid Pointer for CPU %d\n", i)); |
| 1135 | continue; |
| 1136 | } |
| 1137 | /* |
| 1138 | * If the throttling control is unsupported on CPU i, |
| 1139 | * we will report the error message and continue. |
| 1140 | */ |
| 1141 | if (!match_pr->flags.throttling) { |
| 1142 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1143 | "Throttling Control is unsupported " |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1144 | "on CPU %d\n", i)); |
| 1145 | continue; |
| 1146 | } |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1147 | |
| 1148 | arg.pr = match_pr; |
| 1149 | arg.target_state = state; |
| 1150 | arg.force = force; |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 1151 | ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, |
| 1152 | &arg, direct); |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1153 | } |
| 1154 | } |
| 1155 | /* |
| 1156 | * After the set_throttling is called, the |
| 1157 | * throttling notifier is called for every |
| 1158 | * affected cpu to update the T-states. |
| 1159 | * The notifier event is THROTTLING_POSTCHANGE |
| 1160 | */ |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1161 | for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) { |
Zhao Yakui | 33a2a52 | 2008-01-28 13:55:56 +0800 | [diff] [blame] | 1162 | t_state.cpu = i; |
| 1163 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, |
| 1164 | &t_state); |
| 1165 | } |
Lan Tianyu | f3ca416 | 2014-02-26 21:03:05 +0800 | [diff] [blame] | 1166 | |
Zhao Yakui | 357dc4c | 2007-11-29 16:22:43 +0800 | [diff] [blame] | 1167 | return ret; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1168 | } |
| 1169 | |
Thomas Gleixner | 8153f9a | 2017-04-12 22:07:34 +0200 | [diff] [blame] | 1170 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state, |
| 1171 | bool force) |
| 1172 | { |
| 1173 | return __acpi_processor_set_throttling(pr, state, force, false); |
| 1174 | } |
| 1175 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1176 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1178 | int result = 0; |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 1179 | struct acpi_processor_throttling *pthrottling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1182 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
| 1183 | pr->throttling.address, |
| 1184 | pr->throttling.duty_offset, |
| 1185 | pr->throttling.duty_width)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 1187 | /* |
| 1188 | * Evaluate _PTC, _TSS and _TPC |
| 1189 | * They must all be present or none of them can be used. |
| 1190 | */ |
| 1191 | if (acpi_processor_get_throttling_control(pr) || |
| 1192 | acpi_processor_get_throttling_states(pr) || |
| 1193 | acpi_processor_get_platform_limit(pr)) |
| 1194 | { |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 1195 | pr->throttling.acpi_processor_get_throttling = |
| 1196 | &acpi_processor_get_throttling_fadt; |
| 1197 | pr->throttling.acpi_processor_set_throttling = |
| 1198 | &acpi_processor_set_throttling_fadt; |
Alexey Starikovskiy | d1154be | 2008-01-15 00:47:47 -0500 | [diff] [blame] | 1199 | if (acpi_processor_get_fadt_info(pr)) |
| 1200 | return 0; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1201 | } else { |
Len Brown | ff55a9c | 2007-06-02 00:15:25 -0400 | [diff] [blame] | 1202 | pr->throttling.acpi_processor_get_throttling = |
| 1203 | &acpi_processor_get_throttling_ptc; |
| 1204 | pr->throttling.acpi_processor_set_throttling = |
| 1205 | &acpi_processor_set_throttling_ptc; |
Luming Yu | 01854e6 | 2007-05-26 22:49:58 +0800 | [diff] [blame] | 1206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 1208 | /* |
| 1209 | * If TSD package for one CPU can't be parsed successfully, it means |
| 1210 | * that this CPU will have no coordination with other CPUs. |
| 1211 | */ |
| 1212 | if (acpi_processor_get_tsd(pr)) { |
| 1213 | pthrottling = &pr->throttling; |
| 1214 | pthrottling->tsd_valid_flag = 0; |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 1215 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
Zhao Yakui | 1180509 | 2008-01-28 13:53:42 +0800 | [diff] [blame] | 1216 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
| 1217 | } |
Len Brown | c30c620 | 2007-07-25 00:57:46 -0400 | [diff] [blame] | 1218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | /* |
| 1220 | * PIIX4 Errata: We don't support throttling on the original PIIX4. |
| 1221 | * This shouldn't be an issue as few (if any) mobile systems ever |
| 1222 | * used this part. |
| 1223 | */ |
| 1224 | if (errata.piix4.throttle) { |
| 1225 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1226 | "Throttling not supported on PIIX4 A- or B-step\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1227 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
| 1229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1231 | pr->throttling.state_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | pr->flags.throttling = 1; |
| 1234 | |
| 1235 | /* |
| 1236 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. |
| 1237 | * thermal) decide to lower performance if it so chooses, but for now |
| 1238 | * we'll crank up the speed. |
| 1239 | */ |
| 1240 | |
| 1241 | result = acpi_processor_get_throttling(pr); |
| 1242 | if (result) |
| 1243 | goto end; |
| 1244 | |
| 1245 | if (pr->throttling.state) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1246 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1247 | "Disabling throttling (was T%d)\n", |
| 1248 | pr->throttling.state)); |
Frans Pop | 2a90800 | 2009-08-26 14:29:29 -0700 | [diff] [blame] | 1249 | result = acpi_processor_set_throttling(pr, 0, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | if (result) |
| 1251 | goto end; |
| 1252 | } |
| 1253 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 1254 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | if (result) |
| 1256 | pr->flags.throttling = 0; |
| 1257 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1258 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | } |
| 1260 | |