| 1 | /* |
| 2 | * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> |
| 7 | * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
| 8 | * - Added processor hotplug support |
| 9 | * |
| 10 | * |
| 11 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or (at |
| 16 | * your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, but |
| 19 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * General Public License for more details. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/cpufreq.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/acpi.h> |
| 31 | #include <acpi/processor.h> |
| 32 | #ifdef CONFIG_X86 |
| 33 | #include <asm/cpufeature.h> |
| 34 | #endif |
| 35 | |
| 36 | #define PREFIX "ACPI: " |
| 37 | |
| 38 | #define ACPI_PROCESSOR_CLASS "processor" |
| 39 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
| 40 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
| 41 | ACPI_MODULE_NAME("processor_perflib"); |
| 42 | |
| 43 | static DEFINE_MUTEX(performance_mutex); |
| 44 | |
| 45 | /* |
| 46 | * _PPC support is implemented as a CPUfreq policy notifier: |
| 47 | * This means each time a CPUfreq driver registered also with |
| 48 | * the ACPI core is asked to change the speed policy, the maximum |
| 49 | * value is adjusted so that it is within the platform limit. |
| 50 | * |
| 51 | * Also, when a new platform limit value is detected, the CPUfreq |
| 52 | * policy is adjusted accordingly. |
| 53 | */ |
| 54 | |
| 55 | /* ignore_ppc: |
| 56 | * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet |
| 57 | * ignore _PPC |
| 58 | * 0 -> cpufreq low level drivers initialized -> consider _PPC values |
| 59 | * 1 -> ignore _PPC totally -> forced by user through boot param |
| 60 | */ |
| 61 | static int ignore_ppc = -1; |
| 62 | module_param(ignore_ppc, int, 0644); |
| 63 | MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
| 64 | "limited by BIOS, this should help"); |
| 65 | |
| 66 | #define PPC_REGISTERED 1 |
| 67 | #define PPC_IN_USE 2 |
| 68 | |
| 69 | static int acpi_processor_ppc_status; |
| 70 | |
| 71 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, |
| 72 | unsigned long event, void *data) |
| 73 | { |
| 74 | struct cpufreq_policy *policy = data; |
| 75 | struct acpi_processor *pr; |
| 76 | unsigned int ppc = 0; |
| 77 | |
| 78 | if (event == CPUFREQ_START && ignore_ppc <= 0) { |
| 79 | ignore_ppc = 0; |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | if (ignore_ppc) |
| 84 | return 0; |
| 85 | |
| 86 | if (event != CPUFREQ_ADJUST) |
| 87 | return 0; |
| 88 | |
| 89 | mutex_lock(&performance_mutex); |
| 90 | |
| 91 | pr = per_cpu(processors, policy->cpu); |
| 92 | if (!pr || !pr->performance) |
| 93 | goto out; |
| 94 | |
| 95 | ppc = (unsigned int)pr->performance_platform_limit; |
| 96 | |
| 97 | if (ppc >= pr->performance->state_count) |
| 98 | goto out; |
| 99 | |
| 100 | cpufreq_verify_within_limits(policy, 0, |
| 101 | pr->performance->states[ppc]. |
| 102 | core_frequency * 1000); |
| 103 | |
| 104 | out: |
| 105 | mutex_unlock(&performance_mutex); |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static struct notifier_block acpi_ppc_notifier_block = { |
| 111 | .notifier_call = acpi_processor_ppc_notifier, |
| 112 | }; |
| 113 | |
| 114 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
| 115 | { |
| 116 | acpi_status status = 0; |
| 117 | unsigned long long ppc = 0; |
| 118 | |
| 119 | |
| 120 | if (!pr) |
| 121 | return -EINVAL; |
| 122 | |
| 123 | /* |
| 124 | * _PPC indicates the maximum state currently supported by the platform |
| 125 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. |
| 126 | */ |
| 127 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); |
| 128 | |
| 129 | if (status != AE_NOT_FOUND) |
| 130 | acpi_processor_ppc_status |= PPC_IN_USE; |
| 131 | |
| 132 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| 133 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC")); |
| 134 | return -ENODEV; |
| 135 | } |
| 136 | |
| 137 | pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
| 138 | (int)ppc, ppc ? "" : "not"); |
| 139 | |
| 140 | pr->performance_platform_limit = (int)ppc; |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
| 146 | /* |
| 147 | * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status |
| 148 | * @handle: ACPI processor handle |
| 149 | * @status: the status code of _PPC evaluation |
| 150 | * 0: success. OSPM is now using the performance state specificed. |
| 151 | * 1: failure. OSPM has not changed the number of P-states in use |
| 152 | */ |
| 153 | static void acpi_processor_ppc_ost(acpi_handle handle, int status) |
| 154 | { |
| 155 | if (acpi_has_method(handle, "_OST")) |
| 156 | acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, |
| 157 | status, NULL); |
| 158 | } |
| 159 | |
| 160 | int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) |
| 161 | { |
| 162 | int ret; |
| 163 | |
| 164 | if (ignore_ppc) { |
| 165 | /* |
| 166 | * Only when it is notification event, the _OST object |
| 167 | * will be evaluated. Otherwise it is skipped. |
| 168 | */ |
| 169 | if (event_flag) |
| 170 | acpi_processor_ppc_ost(pr->handle, 1); |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | ret = acpi_processor_get_platform_limit(pr); |
| 175 | /* |
| 176 | * Only when it is notification event, the _OST object |
| 177 | * will be evaluated. Otherwise it is skipped. |
| 178 | */ |
| 179 | if (event_flag) { |
| 180 | if (ret < 0) |
| 181 | acpi_processor_ppc_ost(pr->handle, 1); |
| 182 | else |
| 183 | acpi_processor_ppc_ost(pr->handle, 0); |
| 184 | } |
| 185 | if (ret < 0) |
| 186 | return (ret); |
| 187 | else |
| 188 | return cpufreq_update_policy(pr->id); |
| 189 | } |
| 190 | |
| 191 | int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
| 192 | { |
| 193 | struct acpi_processor *pr; |
| 194 | |
| 195 | pr = per_cpu(processors, cpu); |
| 196 | if (!pr || !pr->performance || !pr->performance->state_count) |
| 197 | return -ENODEV; |
| 198 | *limit = pr->performance->states[pr->performance_platform_limit]. |
| 199 | core_frequency * 1000; |
| 200 | return 0; |
| 201 | } |
| 202 | EXPORT_SYMBOL(acpi_processor_get_bios_limit); |
| 203 | |
| 204 | void acpi_processor_ppc_init(void) |
| 205 | { |
| 206 | if (!cpufreq_register_notifier |
| 207 | (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) |
| 208 | acpi_processor_ppc_status |= PPC_REGISTERED; |
| 209 | else |
| 210 | printk(KERN_DEBUG |
| 211 | "Warning: Processor Platform Limit not supported.\n"); |
| 212 | } |
| 213 | |
| 214 | void acpi_processor_ppc_exit(void) |
| 215 | { |
| 216 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
| 217 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, |
| 218 | CPUFREQ_POLICY_NOTIFIER); |
| 219 | |
| 220 | acpi_processor_ppc_status &= ~PPC_REGISTERED; |
| 221 | } |
| 222 | |
| 223 | static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
| 224 | { |
| 225 | int result = 0; |
| 226 | acpi_status status = 0; |
| 227 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 228 | union acpi_object *pct = NULL; |
| 229 | union acpi_object obj = { 0 }; |
| 230 | |
| 231 | |
| 232 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); |
| 233 | if (ACPI_FAILURE(status)) { |
| 234 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT")); |
| 235 | return -ENODEV; |
| 236 | } |
| 237 | |
| 238 | pct = (union acpi_object *)buffer.pointer; |
| 239 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
| 240 | || (pct->package.count != 2)) { |
| 241 | printk(KERN_ERR PREFIX "Invalid _PCT data\n"); |
| 242 | result = -EFAULT; |
| 243 | goto end; |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * control_register |
| 248 | */ |
| 249 | |
| 250 | obj = pct->package.elements[0]; |
| 251 | |
| 252 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 253 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
| 254 | || (obj.buffer.pointer == NULL)) { |
| 255 | printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n"); |
| 256 | result = -EFAULT; |
| 257 | goto end; |
| 258 | } |
| 259 | memcpy(&pr->performance->control_register, obj.buffer.pointer, |
| 260 | sizeof(struct acpi_pct_register)); |
| 261 | |
| 262 | /* |
| 263 | * status_register |
| 264 | */ |
| 265 | |
| 266 | obj = pct->package.elements[1]; |
| 267 | |
| 268 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 269 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
| 270 | || (obj.buffer.pointer == NULL)) { |
| 271 | printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n"); |
| 272 | result = -EFAULT; |
| 273 | goto end; |
| 274 | } |
| 275 | |
| 276 | memcpy(&pr->performance->status_register, obj.buffer.pointer, |
| 277 | sizeof(struct acpi_pct_register)); |
| 278 | |
| 279 | end: |
| 280 | kfree(buffer.pointer); |
| 281 | |
| 282 | return result; |
| 283 | } |
| 284 | |
| 285 | #ifdef CONFIG_X86 |
| 286 | /* |
| 287 | * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding |
| 288 | * in their ACPI data. Calculate the real values and fix up the _PSS data. |
| 289 | */ |
| 290 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) |
| 291 | { |
| 292 | u32 hi, lo, fid, did; |
| 293 | int index = px->control & 0x00000007; |
| 294 | |
| 295 | if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) |
| 296 | return; |
| 297 | |
| 298 | if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) |
| 299 | || boot_cpu_data.x86 == 0x11) { |
| 300 | rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); |
| 301 | /* |
| 302 | * MSR C001_0064+: |
| 303 | * Bit 63: PstateEn. Read-write. If set, the P-state is valid. |
| 304 | */ |
| 305 | if (!(hi & BIT(31))) |
| 306 | return; |
| 307 | |
| 308 | fid = lo & 0x3f; |
| 309 | did = (lo >> 6) & 7; |
| 310 | if (boot_cpu_data.x86 == 0x10) |
| 311 | px->core_frequency = (100 * (fid + 0x10)) >> did; |
| 312 | else |
| 313 | px->core_frequency = (100 * (fid + 8)) >> did; |
| 314 | } |
| 315 | } |
| 316 | #else |
| 317 | static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {}; |
| 318 | #endif |
| 319 | |
| 320 | static int acpi_processor_get_performance_states(struct acpi_processor *pr) |
| 321 | { |
| 322 | int result = 0; |
| 323 | acpi_status status = AE_OK; |
| 324 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 325 | struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" }; |
| 326 | struct acpi_buffer state = { 0, NULL }; |
| 327 | union acpi_object *pss = NULL; |
| 328 | int i; |
| 329 | int last_invalid = -1; |
| 330 | |
| 331 | |
| 332 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
| 333 | if (ACPI_FAILURE(status)) { |
| 334 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS")); |
| 335 | return -ENODEV; |
| 336 | } |
| 337 | |
| 338 | pss = buffer.pointer; |
| 339 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
| 340 | printk(KERN_ERR PREFIX "Invalid _PSS data\n"); |
| 341 | result = -EFAULT; |
| 342 | goto end; |
| 343 | } |
| 344 | |
| 345 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", |
| 346 | pss->package.count)); |
| 347 | |
| 348 | pr->performance->state_count = pss->package.count; |
| 349 | pr->performance->states = |
| 350 | kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, |
| 351 | GFP_KERNEL); |
| 352 | if (!pr->performance->states) { |
| 353 | result = -ENOMEM; |
| 354 | goto end; |
| 355 | } |
| 356 | |
| 357 | for (i = 0; i < pr->performance->state_count; i++) { |
| 358 | |
| 359 | struct acpi_processor_px *px = &(pr->performance->states[i]); |
| 360 | |
| 361 | state.length = sizeof(struct acpi_processor_px); |
| 362 | state.pointer = px; |
| 363 | |
| 364 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); |
| 365 | |
| 366 | status = acpi_extract_package(&(pss->package.elements[i]), |
| 367 | &format, &state); |
| 368 | if (ACPI_FAILURE(status)) { |
| 369 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data")); |
| 370 | result = -EFAULT; |
| 371 | kfree(pr->performance->states); |
| 372 | goto end; |
| 373 | } |
| 374 | |
| 375 | amd_fixup_frequency(px, i); |
| 376 | |
| 377 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 378 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
| 379 | i, |
| 380 | (u32) px->core_frequency, |
| 381 | (u32) px->power, |
| 382 | (u32) px->transition_latency, |
| 383 | (u32) px->bus_master_latency, |
| 384 | (u32) px->control, (u32) px->status)); |
| 385 | |
| 386 | /* |
| 387 | * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq |
| 388 | */ |
| 389 | if (!px->core_frequency || |
| 390 | ((u32)(px->core_frequency * 1000) != |
| 391 | (px->core_frequency * 1000))) { |
| 392 | printk(KERN_ERR FW_BUG PREFIX |
| 393 | "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
| 394 | pr->id, px->core_frequency); |
| 395 | if (last_invalid == -1) |
| 396 | last_invalid = i; |
| 397 | } else { |
| 398 | if (last_invalid != -1) { |
| 399 | /* |
| 400 | * Copy this valid entry over last_invalid entry |
| 401 | */ |
| 402 | memcpy(&(pr->performance->states[last_invalid]), |
| 403 | px, sizeof(struct acpi_processor_px)); |
| 404 | ++last_invalid; |
| 405 | } |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | if (last_invalid == 0) { |
| 410 | printk(KERN_ERR FW_BUG PREFIX |
| 411 | "No valid BIOS _PSS frequency found for processor %d\n", pr->id); |
| 412 | result = -EFAULT; |
| 413 | kfree(pr->performance->states); |
| 414 | pr->performance->states = NULL; |
| 415 | } |
| 416 | |
| 417 | if (last_invalid > 0) |
| 418 | pr->performance->state_count = last_invalid; |
| 419 | |
| 420 | end: |
| 421 | kfree(buffer.pointer); |
| 422 | |
| 423 | return result; |
| 424 | } |
| 425 | |
| 426 | int acpi_processor_get_performance_info(struct acpi_processor *pr) |
| 427 | { |
| 428 | int result = 0; |
| 429 | |
| 430 | if (!pr || !pr->performance || !pr->handle) |
| 431 | return -EINVAL; |
| 432 | |
| 433 | if (!acpi_has_method(pr->handle, "_PCT")) { |
| 434 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 435 | "ACPI-based processor performance control unavailable\n")); |
| 436 | return -ENODEV; |
| 437 | } |
| 438 | |
| 439 | result = acpi_processor_get_performance_control(pr); |
| 440 | if (result) |
| 441 | goto update_bios; |
| 442 | |
| 443 | result = acpi_processor_get_performance_states(pr); |
| 444 | if (result) |
| 445 | goto update_bios; |
| 446 | |
| 447 | /* We need to call _PPC once when cpufreq starts */ |
| 448 | if (ignore_ppc != 1) |
| 449 | result = acpi_processor_get_platform_limit(pr); |
| 450 | |
| 451 | return result; |
| 452 | |
| 453 | /* |
| 454 | * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that |
| 455 | * the BIOS is older than the CPU and does not know its frequencies |
| 456 | */ |
| 457 | update_bios: |
| 458 | #ifdef CONFIG_X86 |
| 459 | if (acpi_has_method(pr->handle, "_PPC")) { |
| 460 | if(boot_cpu_has(X86_FEATURE_EST)) |
| 461 | printk(KERN_WARNING FW_BUG "BIOS needs update for CPU " |
| 462 | "frequency support\n"); |
| 463 | } |
| 464 | #endif |
| 465 | return result; |
| 466 | } |
| 467 | EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
| 468 | int acpi_processor_notify_smm(struct module *calling_module) |
| 469 | { |
| 470 | acpi_status status; |
| 471 | static int is_done = 0; |
| 472 | |
| 473 | |
| 474 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
| 475 | return -EBUSY; |
| 476 | |
| 477 | if (!try_module_get(calling_module)) |
| 478 | return -EINVAL; |
| 479 | |
| 480 | /* is_done is set to negative if an error occurred, |
| 481 | * and to postitive if _no_ error occurred, but SMM |
| 482 | * was already notified. This avoids double notification |
| 483 | * which might lead to unexpected results... |
| 484 | */ |
| 485 | if (is_done > 0) { |
| 486 | module_put(calling_module); |
| 487 | return 0; |
| 488 | } else if (is_done < 0) { |
| 489 | module_put(calling_module); |
| 490 | return is_done; |
| 491 | } |
| 492 | |
| 493 | is_done = -EIO; |
| 494 | |
| 495 | /* Can't write pstate_control to smi_command if either value is zero */ |
| 496 | if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) { |
| 497 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n")); |
| 498 | module_put(calling_module); |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 503 | "Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
| 504 | acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); |
| 505 | |
| 506 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
| 507 | (u32) acpi_gbl_FADT.pstate_control, 8); |
| 508 | if (ACPI_FAILURE(status)) { |
| 509 | ACPI_EXCEPTION((AE_INFO, status, |
| 510 | "Failed to write pstate_control [0x%x] to " |
| 511 | "smi_command [0x%x]", acpi_gbl_FADT.pstate_control, |
| 512 | acpi_gbl_FADT.smi_command)); |
| 513 | module_put(calling_module); |
| 514 | return status; |
| 515 | } |
| 516 | |
| 517 | /* Success. If there's no _PPC, we need to fear nothing, so |
| 518 | * we can allow the cpufreq driver to be rmmod'ed. */ |
| 519 | is_done = 1; |
| 520 | |
| 521 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) |
| 522 | module_put(calling_module); |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
| 528 | |
| 529 | static int acpi_processor_get_psd(struct acpi_processor *pr) |
| 530 | { |
| 531 | int result = 0; |
| 532 | acpi_status status = AE_OK; |
| 533 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 534 | struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"}; |
| 535 | struct acpi_buffer state = {0, NULL}; |
| 536 | union acpi_object *psd = NULL; |
| 537 | struct acpi_psd_package *pdomain; |
| 538 | |
| 539 | status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer); |
| 540 | if (ACPI_FAILURE(status)) { |
| 541 | return -ENODEV; |
| 542 | } |
| 543 | |
| 544 | psd = buffer.pointer; |
| 545 | if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) { |
| 546 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
| 547 | result = -EFAULT; |
| 548 | goto end; |
| 549 | } |
| 550 | |
| 551 | if (psd->package.count != 1) { |
| 552 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
| 553 | result = -EFAULT; |
| 554 | goto end; |
| 555 | } |
| 556 | |
| 557 | pdomain = &(pr->performance->domain_info); |
| 558 | |
| 559 | state.length = sizeof(struct acpi_psd_package); |
| 560 | state.pointer = pdomain; |
| 561 | |
| 562 | status = acpi_extract_package(&(psd->package.elements[0]), |
| 563 | &format, &state); |
| 564 | if (ACPI_FAILURE(status)) { |
| 565 | printk(KERN_ERR PREFIX "Invalid _PSD data\n"); |
| 566 | result = -EFAULT; |
| 567 | goto end; |
| 568 | } |
| 569 | |
| 570 | if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { |
| 571 | printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n"); |
| 572 | result = -EFAULT; |
| 573 | goto end; |
| 574 | } |
| 575 | |
| 576 | if (pdomain->revision != ACPI_PSD_REV0_REVISION) { |
| 577 | printk(KERN_ERR PREFIX "Unknown _PSD:revision\n"); |
| 578 | result = -EFAULT; |
| 579 | goto end; |
| 580 | } |
| 581 | |
| 582 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && |
| 583 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && |
| 584 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { |
| 585 | printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n"); |
| 586 | result = -EFAULT; |
| 587 | goto end; |
| 588 | } |
| 589 | end: |
| 590 | kfree(buffer.pointer); |
| 591 | return result; |
| 592 | } |
| 593 | |
| 594 | int acpi_processor_preregister_performance( |
| 595 | struct acpi_processor_performance __percpu *performance) |
| 596 | { |
| 597 | int count_target; |
| 598 | int retval = 0; |
| 599 | unsigned int i, j; |
| 600 | cpumask_var_t covered_cpus; |
| 601 | struct acpi_processor *pr; |
| 602 | struct acpi_psd_package *pdomain; |
| 603 | struct acpi_processor *match_pr; |
| 604 | struct acpi_psd_package *match_pdomain; |
| 605 | |
| 606 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
| 607 | return -ENOMEM; |
| 608 | |
| 609 | mutex_lock(&performance_mutex); |
| 610 | |
| 611 | /* |
| 612 | * Check if another driver has already registered, and abort before |
| 613 | * changing pr->performance if it has. Check input data as well. |
| 614 | */ |
| 615 | for_each_possible_cpu(i) { |
| 616 | pr = per_cpu(processors, i); |
| 617 | if (!pr) { |
| 618 | /* Look only at processors in ACPI namespace */ |
| 619 | continue; |
| 620 | } |
| 621 | |
| 622 | if (pr->performance) { |
| 623 | retval = -EBUSY; |
| 624 | goto err_out; |
| 625 | } |
| 626 | |
| 627 | if (!performance || !per_cpu_ptr(performance, i)) { |
| 628 | retval = -EINVAL; |
| 629 | goto err_out; |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | /* Call _PSD for all CPUs */ |
| 634 | for_each_possible_cpu(i) { |
| 635 | pr = per_cpu(processors, i); |
| 636 | if (!pr) |
| 637 | continue; |
| 638 | |
| 639 | pr->performance = per_cpu_ptr(performance, i); |
| 640 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
| 641 | if (acpi_processor_get_psd(pr)) { |
| 642 | retval = -EINVAL; |
| 643 | continue; |
| 644 | } |
| 645 | } |
| 646 | if (retval) |
| 647 | goto err_ret; |
| 648 | |
| 649 | /* |
| 650 | * Now that we have _PSD data from all CPUs, lets setup P-state |
| 651 | * domain info. |
| 652 | */ |
| 653 | for_each_possible_cpu(i) { |
| 654 | pr = per_cpu(processors, i); |
| 655 | if (!pr) |
| 656 | continue; |
| 657 | |
| 658 | if (cpumask_test_cpu(i, covered_cpus)) |
| 659 | continue; |
| 660 | |
| 661 | pdomain = &(pr->performance->domain_info); |
| 662 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
| 663 | cpumask_set_cpu(i, covered_cpus); |
| 664 | if (pdomain->num_processors <= 1) |
| 665 | continue; |
| 666 | |
| 667 | /* Validate the Domain info */ |
| 668 | count_target = pdomain->num_processors; |
| 669 | if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL) |
| 670 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
| 671 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) |
| 672 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW; |
| 673 | else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) |
| 674 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY; |
| 675 | |
| 676 | for_each_possible_cpu(j) { |
| 677 | if (i == j) |
| 678 | continue; |
| 679 | |
| 680 | match_pr = per_cpu(processors, j); |
| 681 | if (!match_pr) |
| 682 | continue; |
| 683 | |
| 684 | match_pdomain = &(match_pr->performance->domain_info); |
| 685 | if (match_pdomain->domain != pdomain->domain) |
| 686 | continue; |
| 687 | |
| 688 | /* Here i and j are in the same domain */ |
| 689 | |
| 690 | if (match_pdomain->num_processors != count_target) { |
| 691 | retval = -EINVAL; |
| 692 | goto err_ret; |
| 693 | } |
| 694 | |
| 695 | if (pdomain->coord_type != match_pdomain->coord_type) { |
| 696 | retval = -EINVAL; |
| 697 | goto err_ret; |
| 698 | } |
| 699 | |
| 700 | cpumask_set_cpu(j, covered_cpus); |
| 701 | cpumask_set_cpu(j, pr->performance->shared_cpu_map); |
| 702 | } |
| 703 | |
| 704 | for_each_possible_cpu(j) { |
| 705 | if (i == j) |
| 706 | continue; |
| 707 | |
| 708 | match_pr = per_cpu(processors, j); |
| 709 | if (!match_pr) |
| 710 | continue; |
| 711 | |
| 712 | match_pdomain = &(match_pr->performance->domain_info); |
| 713 | if (match_pdomain->domain != pdomain->domain) |
| 714 | continue; |
| 715 | |
| 716 | match_pr->performance->shared_type = |
| 717 | pr->performance->shared_type; |
| 718 | cpumask_copy(match_pr->performance->shared_cpu_map, |
| 719 | pr->performance->shared_cpu_map); |
| 720 | } |
| 721 | } |
| 722 | |
| 723 | err_ret: |
| 724 | for_each_possible_cpu(i) { |
| 725 | pr = per_cpu(processors, i); |
| 726 | if (!pr || !pr->performance) |
| 727 | continue; |
| 728 | |
| 729 | /* Assume no coordination on any error parsing domain info */ |
| 730 | if (retval) { |
| 731 | cpumask_clear(pr->performance->shared_cpu_map); |
| 732 | cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
| 733 | pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
| 734 | } |
| 735 | pr->performance = NULL; /* Will be set for real in register */ |
| 736 | } |
| 737 | |
| 738 | err_out: |
| 739 | mutex_unlock(&performance_mutex); |
| 740 | free_cpumask_var(covered_cpus); |
| 741 | return retval; |
| 742 | } |
| 743 | EXPORT_SYMBOL(acpi_processor_preregister_performance); |
| 744 | |
| 745 | int |
| 746 | acpi_processor_register_performance(struct acpi_processor_performance |
| 747 | *performance, unsigned int cpu) |
| 748 | { |
| 749 | struct acpi_processor *pr; |
| 750 | |
| 751 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
| 752 | return -EINVAL; |
| 753 | |
| 754 | mutex_lock(&performance_mutex); |
| 755 | |
| 756 | pr = per_cpu(processors, cpu); |
| 757 | if (!pr) { |
| 758 | mutex_unlock(&performance_mutex); |
| 759 | return -ENODEV; |
| 760 | } |
| 761 | |
| 762 | if (pr->performance) { |
| 763 | mutex_unlock(&performance_mutex); |
| 764 | return -EBUSY; |
| 765 | } |
| 766 | |
| 767 | WARN_ON(!performance); |
| 768 | |
| 769 | pr->performance = performance; |
| 770 | |
| 771 | if (acpi_processor_get_performance_info(pr)) { |
| 772 | pr->performance = NULL; |
| 773 | mutex_unlock(&performance_mutex); |
| 774 | return -EIO; |
| 775 | } |
| 776 | |
| 777 | mutex_unlock(&performance_mutex); |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | EXPORT_SYMBOL(acpi_processor_register_performance); |
| 782 | |
| 783 | void acpi_processor_unregister_performance(unsigned int cpu) |
| 784 | { |
| 785 | struct acpi_processor *pr; |
| 786 | |
| 787 | mutex_lock(&performance_mutex); |
| 788 | |
| 789 | pr = per_cpu(processors, cpu); |
| 790 | if (!pr) { |
| 791 | mutex_unlock(&performance_mutex); |
| 792 | return; |
| 793 | } |
| 794 | |
| 795 | if (pr->performance) |
| 796 | kfree(pr->performance->states); |
| 797 | pr->performance = NULL; |
| 798 | |
| 799 | mutex_unlock(&performance_mutex); |
| 800 | |
| 801 | return; |
| 802 | } |
| 803 | |
| 804 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |