Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | * You should have received a copy of the GNU General Public License along |
| 24 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/cpufreq.h> |
| 34 | |
| 35 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF |
| 36 | #include <linux/proc_fs.h> |
| 37 | #include <linux/seq_file.h> |
| 38 | |
| 39 | #include <asm/uaccess.h> |
| 40 | #endif |
| 41 | |
| 42 | #include <acpi/acpi_bus.h> |
| 43 | #include <acpi/processor.h> |
| 44 | |
| 45 | |
| 46 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
| 47 | #define ACPI_PROCESSOR_CLASS "processor" |
| 48 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" |
| 49 | #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
| 50 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
| 51 | ACPI_MODULE_NAME ("acpi_processor") |
| 52 | |
| 53 | |
| 54 | static DECLARE_MUTEX(performance_sem); |
| 55 | |
| 56 | /* |
| 57 | * _PPC support is implemented as a CPUfreq policy notifier: |
| 58 | * This means each time a CPUfreq driver registered also with |
| 59 | * the ACPI core is asked to change the speed policy, the maximum |
| 60 | * value is adjusted so that it is within the platform limit. |
| 61 | * |
| 62 | * Also, when a new platform limit value is detected, the CPUfreq |
| 63 | * policy is adjusted accordingly. |
| 64 | */ |
| 65 | |
| 66 | #define PPC_REGISTERED 1 |
| 67 | #define PPC_IN_USE 2 |
| 68 | |
| 69 | static int acpi_processor_ppc_status = 0; |
| 70 | |
| 71 | static int acpi_processor_ppc_notifier(struct notifier_block *nb, |
| 72 | unsigned long event, |
| 73 | void *data) |
| 74 | { |
| 75 | struct cpufreq_policy *policy = data; |
| 76 | struct acpi_processor *pr; |
| 77 | unsigned int ppc = 0; |
| 78 | |
| 79 | down(&performance_sem); |
| 80 | |
| 81 | if (event != CPUFREQ_INCOMPATIBLE) |
| 82 | goto out; |
| 83 | |
| 84 | pr = processors[policy->cpu]; |
| 85 | if (!pr || !pr->performance) |
| 86 | goto out; |
| 87 | |
| 88 | ppc = (unsigned int) pr->performance_platform_limit; |
| 89 | if (!ppc) |
| 90 | goto out; |
| 91 | |
| 92 | if (ppc > pr->performance->state_count) |
| 93 | goto out; |
| 94 | |
| 95 | cpufreq_verify_within_limits(policy, 0, |
| 96 | pr->performance->states[ppc].core_frequency * 1000); |
| 97 | |
| 98 | out: |
| 99 | up(&performance_sem); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | static struct notifier_block acpi_ppc_notifier_block = { |
| 106 | .notifier_call = acpi_processor_ppc_notifier, |
| 107 | }; |
| 108 | |
| 109 | |
| 110 | static int |
| 111 | acpi_processor_get_platform_limit ( |
| 112 | struct acpi_processor* pr) |
| 113 | { |
| 114 | acpi_status status = 0; |
| 115 | unsigned long ppc = 0; |
| 116 | |
| 117 | ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit"); |
| 118 | |
| 119 | if (!pr) |
| 120 | return_VALUE(-EINVAL); |
| 121 | |
| 122 | /* |
| 123 | * _PPC indicates the maximum state currently supported by the platform |
| 124 | * (e.g. 0 = states 0..n; 1 = states 1..n; etc. |
| 125 | */ |
| 126 | status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); |
| 127 | |
| 128 | if (status != AE_NOT_FOUND) |
| 129 | acpi_processor_ppc_status |= PPC_IN_USE; |
| 130 | |
| 131 | if(ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| 132 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n")); |
| 133 | return_VALUE(-ENODEV); |
| 134 | } |
| 135 | |
| 136 | pr->performance_platform_limit = (int) ppc; |
| 137 | |
| 138 | return_VALUE(0); |
| 139 | } |
| 140 | |
| 141 | |
| 142 | int acpi_processor_ppc_has_changed( |
| 143 | struct acpi_processor *pr) |
| 144 | { |
| 145 | int ret = acpi_processor_get_platform_limit(pr); |
| 146 | if (ret < 0) |
| 147 | return (ret); |
| 148 | else |
| 149 | return cpufreq_update_policy(pr->id); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | void acpi_processor_ppc_init(void) { |
| 154 | if (!cpufreq_register_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER)) |
| 155 | acpi_processor_ppc_status |= PPC_REGISTERED; |
| 156 | else |
| 157 | printk(KERN_DEBUG "Warning: Processor Platform Limit not supported.\n"); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | void acpi_processor_ppc_exit(void) { |
| 162 | if (acpi_processor_ppc_status & PPC_REGISTERED) |
| 163 | cpufreq_unregister_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER); |
| 164 | |
| 165 | acpi_processor_ppc_status &= ~PPC_REGISTERED; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * when registering a cpufreq driver with this ACPI processor driver, the |
| 170 | * _PCT and _PSS structures are read out and written into struct |
| 171 | * acpi_processor_performance. |
| 172 | */ |
| 173 | static int acpi_processor_set_pdc (struct acpi_processor *pr) |
| 174 | { |
| 175 | acpi_status status = AE_OK; |
| 176 | u32 arg0_buf[3]; |
| 177 | union acpi_object arg0 = {ACPI_TYPE_BUFFER}; |
| 178 | struct acpi_object_list no_object = {1, &arg0}; |
| 179 | struct acpi_object_list *pdc; |
| 180 | |
| 181 | ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); |
| 182 | |
| 183 | arg0.buffer.length = 12; |
| 184 | arg0.buffer.pointer = (u8 *) arg0_buf; |
| 185 | arg0_buf[0] = ACPI_PDC_REVISION_ID; |
| 186 | arg0_buf[1] = 0; |
| 187 | arg0_buf[2] = 0; |
| 188 | |
| 189 | pdc = (pr->performance->pdc) ? pr->performance->pdc : &no_object; |
| 190 | |
| 191 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); |
| 192 | |
| 193 | if ((ACPI_FAILURE(status)) && (pr->performance->pdc)) |
| 194 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n")); |
| 195 | |
| 196 | return_VALUE(status); |
| 197 | } |
| 198 | |
| 199 | |
| 200 | static int |
| 201 | acpi_processor_get_performance_control ( |
| 202 | struct acpi_processor *pr) |
| 203 | { |
| 204 | int result = 0; |
| 205 | acpi_status status = 0; |
| 206 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 207 | union acpi_object *pct = NULL; |
| 208 | union acpi_object obj = {0}; |
| 209 | |
| 210 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control"); |
| 211 | |
| 212 | status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); |
| 213 | if(ACPI_FAILURE(status)) { |
| 214 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n")); |
| 215 | return_VALUE(-ENODEV); |
| 216 | } |
| 217 | |
| 218 | pct = (union acpi_object *) buffer.pointer; |
| 219 | if (!pct || (pct->type != ACPI_TYPE_PACKAGE) |
| 220 | || (pct->package.count != 2)) { |
| 221 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n")); |
| 222 | result = -EFAULT; |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * control_register |
| 228 | */ |
| 229 | |
| 230 | obj = pct->package.elements[0]; |
| 231 | |
| 232 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 233 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
| 234 | || (obj.buffer.pointer == NULL)) { |
| 235 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 236 | "Invalid _PCT data (control_register)\n")); |
| 237 | result = -EFAULT; |
| 238 | goto end; |
| 239 | } |
| 240 | memcpy(&pr->performance->control_register, obj.buffer.pointer, sizeof(struct acpi_pct_register)); |
| 241 | |
| 242 | |
| 243 | /* |
| 244 | * status_register |
| 245 | */ |
| 246 | |
| 247 | obj = pct->package.elements[1]; |
| 248 | |
| 249 | if ((obj.type != ACPI_TYPE_BUFFER) |
| 250 | || (obj.buffer.length < sizeof(struct acpi_pct_register)) |
| 251 | || (obj.buffer.pointer == NULL)) { |
| 252 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 253 | "Invalid _PCT data (status_register)\n")); |
| 254 | result = -EFAULT; |
| 255 | goto end; |
| 256 | } |
| 257 | |
| 258 | memcpy(&pr->performance->status_register, obj.buffer.pointer, sizeof(struct acpi_pct_register)); |
| 259 | |
| 260 | end: |
| 261 | acpi_os_free(buffer.pointer); |
| 262 | |
| 263 | return_VALUE(result); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | static int |
| 268 | acpi_processor_get_performance_states ( |
| 269 | struct acpi_processor *pr) |
| 270 | { |
| 271 | int result = 0; |
| 272 | acpi_status status = AE_OK; |
| 273 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| 274 | struct acpi_buffer format = {sizeof("NNNNNN"), "NNNNNN"}; |
| 275 | struct acpi_buffer state = {0, NULL}; |
| 276 | union acpi_object *pss = NULL; |
| 277 | int i; |
| 278 | |
| 279 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states"); |
| 280 | |
| 281 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
| 282 | if(ACPI_FAILURE(status)) { |
| 283 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n")); |
| 284 | return_VALUE(-ENODEV); |
| 285 | } |
| 286 | |
| 287 | pss = (union acpi_object *) buffer.pointer; |
| 288 | if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) { |
| 289 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n")); |
| 290 | result = -EFAULT; |
| 291 | goto end; |
| 292 | } |
| 293 | |
| 294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n", |
| 295 | pss->package.count)); |
| 296 | |
| 297 | pr->performance->state_count = pss->package.count; |
| 298 | pr->performance->states = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, GFP_KERNEL); |
| 299 | if (!pr->performance->states) { |
| 300 | result = -ENOMEM; |
| 301 | goto end; |
| 302 | } |
| 303 | |
| 304 | for (i = 0; i < pr->performance->state_count; i++) { |
| 305 | |
| 306 | struct acpi_processor_px *px = &(pr->performance->states[i]); |
| 307 | |
| 308 | state.length = sizeof(struct acpi_processor_px); |
| 309 | state.pointer = px; |
| 310 | |
| 311 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); |
| 312 | |
| 313 | status = acpi_extract_package(&(pss->package.elements[i]), |
| 314 | &format, &state); |
| 315 | if (ACPI_FAILURE(status)) { |
| 316 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n")); |
| 317 | result = -EFAULT; |
| 318 | kfree(pr->performance->states); |
| 319 | goto end; |
| 320 | } |
| 321 | |
| 322 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 323 | "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
| 324 | i, |
| 325 | (u32) px->core_frequency, |
| 326 | (u32) px->power, |
| 327 | (u32) px->transition_latency, |
| 328 | (u32) px->bus_master_latency, |
| 329 | (u32) px->control, |
| 330 | (u32) px->status)); |
| 331 | |
| 332 | if (!px->core_frequency) { |
| 333 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data: freq is zero\n")); |
| 334 | result = -EFAULT; |
| 335 | kfree(pr->performance->states); |
| 336 | goto end; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | end: |
| 341 | acpi_os_free(buffer.pointer); |
| 342 | |
| 343 | return_VALUE(result); |
| 344 | } |
| 345 | |
| 346 | |
| 347 | static int |
| 348 | acpi_processor_get_performance_info ( |
| 349 | struct acpi_processor *pr) |
| 350 | { |
| 351 | int result = 0; |
| 352 | acpi_status status = AE_OK; |
| 353 | acpi_handle handle = NULL; |
| 354 | |
| 355 | ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info"); |
| 356 | |
| 357 | if (!pr || !pr->performance || !pr->handle) |
| 358 | return_VALUE(-EINVAL); |
| 359 | |
| 360 | acpi_processor_set_pdc(pr); |
| 361 | |
| 362 | status = acpi_get_handle(pr->handle, "_PCT", &handle); |
| 363 | if (ACPI_FAILURE(status)) { |
| 364 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 365 | "ACPI-based processor performance control unavailable\n")); |
| 366 | return_VALUE(-ENODEV); |
| 367 | } |
| 368 | |
| 369 | result = acpi_processor_get_performance_control(pr); |
| 370 | if (result) |
| 371 | return_VALUE(result); |
| 372 | |
| 373 | result = acpi_processor_get_performance_states(pr); |
| 374 | if (result) |
| 375 | return_VALUE(result); |
| 376 | |
| 377 | result = acpi_processor_get_platform_limit(pr); |
| 378 | if (result) |
| 379 | return_VALUE(result); |
| 380 | |
| 381 | return_VALUE(0); |
| 382 | } |
| 383 | |
| 384 | |
| 385 | int acpi_processor_notify_smm(struct module *calling_module) { |
| 386 | acpi_status status; |
| 387 | static int is_done = 0; |
| 388 | |
| 389 | ACPI_FUNCTION_TRACE("acpi_processor_notify_smm"); |
| 390 | |
| 391 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
| 392 | return_VALUE(-EBUSY); |
| 393 | |
| 394 | if (!try_module_get(calling_module)) |
| 395 | return_VALUE(-EINVAL); |
| 396 | |
| 397 | /* is_done is set to negative if an error occured, |
| 398 | * and to postitive if _no_ error occured, but SMM |
| 399 | * was already notified. This avoids double notification |
| 400 | * which might lead to unexpected results... |
| 401 | */ |
| 402 | if (is_done > 0) { |
| 403 | module_put(calling_module); |
| 404 | return_VALUE(0); |
| 405 | } |
| 406 | else if (is_done < 0) { |
| 407 | module_put(calling_module); |
| 408 | return_VALUE(is_done); |
| 409 | } |
| 410 | |
| 411 | is_done = -EIO; |
| 412 | |
| 413 | /* Can't write pstate_cnt to smi_cmd if either value is zero */ |
| 414 | if ((!acpi_fadt.smi_cmd) || |
| 415 | (!acpi_fadt.pstate_cnt)) { |
| 416 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 417 | "No SMI port or pstate_cnt\n")); |
| 418 | module_put(calling_module); |
| 419 | return_VALUE(0); |
| 420 | } |
| 421 | |
| 422 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); |
| 423 | |
| 424 | /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use |
| 425 | * it anyway, so we need to support it... */ |
| 426 | if (acpi_fadt_is_v1) { |
| 427 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Using v1.0 FADT reserved value for pstate_cnt\n")); |
| 428 | } |
| 429 | |
| 430 | status = acpi_os_write_port (acpi_fadt.smi_cmd, |
| 431 | (u32) acpi_fadt.pstate_cnt, 8); |
| 432 | if (ACPI_FAILURE (status)) { |
| 433 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 434 | "Failed to write pstate_cnt [0x%x] to " |
| 435 | "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd)); |
| 436 | module_put(calling_module); |
| 437 | return_VALUE(status); |
| 438 | } |
| 439 | |
| 440 | /* Success. If there's no _PPC, we need to fear nothing, so |
| 441 | * we can allow the cpufreq driver to be rmmod'ed. */ |
| 442 | is_done = 1; |
| 443 | |
| 444 | if (!(acpi_processor_ppc_status & PPC_IN_USE)) |
| 445 | module_put(calling_module); |
| 446 | |
| 447 | return_VALUE(0); |
| 448 | } |
| 449 | EXPORT_SYMBOL(acpi_processor_notify_smm); |
| 450 | |
| 451 | |
| 452 | #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF |
| 453 | /* /proc/acpi/processor/../performance interface (DEPRECATED) */ |
| 454 | |
| 455 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file); |
| 456 | static struct file_operations acpi_processor_perf_fops = { |
| 457 | .open = acpi_processor_perf_open_fs, |
| 458 | .read = seq_read, |
| 459 | .llseek = seq_lseek, |
| 460 | .release = single_release, |
| 461 | }; |
| 462 | |
| 463 | static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset) |
| 464 | { |
| 465 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
| 466 | int i; |
| 467 | |
| 468 | ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show"); |
| 469 | |
| 470 | if (!pr) |
| 471 | goto end; |
| 472 | |
| 473 | if (!pr->performance) { |
| 474 | seq_puts(seq, "<not supported>\n"); |
| 475 | goto end; |
| 476 | } |
| 477 | |
| 478 | seq_printf(seq, "state count: %d\n" |
| 479 | "active state: P%d\n", |
| 480 | pr->performance->state_count, |
| 481 | pr->performance->state); |
| 482 | |
| 483 | seq_puts(seq, "states:\n"); |
| 484 | for (i = 0; i < pr->performance->state_count; i++) |
| 485 | seq_printf(seq, " %cP%d: %d MHz, %d mW, %d uS\n", |
| 486 | (i == pr->performance->state?'*':' '), i, |
| 487 | (u32) pr->performance->states[i].core_frequency, |
| 488 | (u32) pr->performance->states[i].power, |
| 489 | (u32) pr->performance->states[i].transition_latency); |
| 490 | |
| 491 | end: |
| 492 | return_VALUE(0); |
| 493 | } |
| 494 | |
| 495 | static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file) |
| 496 | { |
| 497 | return single_open(file, acpi_processor_perf_seq_show, |
| 498 | PDE(inode)->data); |
| 499 | } |
| 500 | |
| 501 | static ssize_t |
| 502 | acpi_processor_write_performance ( |
| 503 | struct file *file, |
| 504 | const char __user *buffer, |
| 505 | size_t count, |
| 506 | loff_t *data) |
| 507 | { |
| 508 | int result = 0; |
| 509 | struct seq_file *m = (struct seq_file *) file->private_data; |
| 510 | struct acpi_processor *pr = (struct acpi_processor *) m->private; |
| 511 | struct acpi_processor_performance *perf; |
| 512 | char state_string[12] = {'\0'}; |
| 513 | unsigned int new_state = 0; |
| 514 | struct cpufreq_policy policy; |
| 515 | |
| 516 | ACPI_FUNCTION_TRACE("acpi_processor_write_performance"); |
| 517 | |
| 518 | if (!pr || (count > sizeof(state_string) - 1)) |
| 519 | return_VALUE(-EINVAL); |
| 520 | |
| 521 | perf = pr->performance; |
| 522 | if (!perf) |
| 523 | return_VALUE(-EINVAL); |
| 524 | |
| 525 | if (copy_from_user(state_string, buffer, count)) |
| 526 | return_VALUE(-EFAULT); |
| 527 | |
| 528 | state_string[count] = '\0'; |
| 529 | new_state = simple_strtoul(state_string, NULL, 0); |
| 530 | |
| 531 | if (new_state >= perf->state_count) |
| 532 | return_VALUE(-EINVAL); |
| 533 | |
| 534 | cpufreq_get_policy(&policy, pr->id); |
| 535 | |
| 536 | policy.cpu = pr->id; |
| 537 | policy.min = perf->states[new_state].core_frequency * 1000; |
| 538 | policy.max = perf->states[new_state].core_frequency * 1000; |
| 539 | |
| 540 | result = cpufreq_set_policy(&policy); |
| 541 | if (result) |
| 542 | return_VALUE(result); |
| 543 | |
| 544 | return_VALUE(count); |
| 545 | } |
| 546 | |
| 547 | static void |
| 548 | acpi_cpufreq_add_file ( |
| 549 | struct acpi_processor *pr) |
| 550 | { |
| 551 | struct proc_dir_entry *entry = NULL; |
| 552 | struct acpi_device *device = NULL; |
| 553 | |
| 554 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); |
| 555 | |
| 556 | if (acpi_bus_get_device(pr->handle, &device)) |
| 557 | return_VOID; |
| 558 | |
| 559 | /* add file 'performance' [R/W] */ |
| 560 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, |
| 561 | S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); |
| 562 | if (!entry) |
| 563 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 564 | "Unable to create '%s' fs entry\n", |
| 565 | ACPI_PROCESSOR_FILE_PERFORMANCE)); |
| 566 | else { |
| 567 | entry->proc_fops = &acpi_processor_perf_fops; |
| 568 | entry->proc_fops->write = acpi_processor_write_performance; |
| 569 | entry->data = acpi_driver_data(device); |
| 570 | entry->owner = THIS_MODULE; |
| 571 | } |
| 572 | return_VOID; |
| 573 | } |
| 574 | |
| 575 | static void |
| 576 | acpi_cpufreq_remove_file ( |
| 577 | struct acpi_processor *pr) |
| 578 | { |
| 579 | struct acpi_device *device = NULL; |
| 580 | |
| 581 | ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile"); |
| 582 | |
| 583 | if (acpi_bus_get_device(pr->handle, &device)) |
| 584 | return_VOID; |
| 585 | |
| 586 | /* remove file 'performance' */ |
| 587 | remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE, |
| 588 | acpi_device_dir(device)); |
| 589 | |
| 590 | return_VOID; |
| 591 | } |
| 592 | |
| 593 | #else |
| 594 | static void acpi_cpufreq_add_file (struct acpi_processor *pr) { return; } |
| 595 | static void acpi_cpufreq_remove_file (struct acpi_processor *pr) { return; } |
| 596 | #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */ |
| 597 | |
| 598 | |
| 599 | int |
| 600 | acpi_processor_register_performance ( |
| 601 | struct acpi_processor_performance * performance, |
| 602 | unsigned int cpu) |
| 603 | { |
| 604 | struct acpi_processor *pr; |
| 605 | |
| 606 | ACPI_FUNCTION_TRACE("acpi_processor_register_performance"); |
| 607 | |
| 608 | if (!(acpi_processor_ppc_status & PPC_REGISTERED)) |
| 609 | return_VALUE(-EINVAL); |
| 610 | |
| 611 | down(&performance_sem); |
| 612 | |
| 613 | pr = processors[cpu]; |
| 614 | if (!pr) { |
| 615 | up(&performance_sem); |
| 616 | return_VALUE(-ENODEV); |
| 617 | } |
| 618 | |
| 619 | if (pr->performance) { |
| 620 | up(&performance_sem); |
| 621 | return_VALUE(-EBUSY); |
| 622 | } |
| 623 | |
| 624 | pr->performance = performance; |
| 625 | |
| 626 | if (acpi_processor_get_performance_info(pr)) { |
| 627 | pr->performance = NULL; |
| 628 | up(&performance_sem); |
| 629 | return_VALUE(-EIO); |
| 630 | } |
| 631 | |
| 632 | acpi_cpufreq_add_file(pr); |
| 633 | |
| 634 | up(&performance_sem); |
| 635 | return_VALUE(0); |
| 636 | } |
| 637 | EXPORT_SYMBOL(acpi_processor_register_performance); |
| 638 | |
| 639 | |
| 640 | void |
| 641 | acpi_processor_unregister_performance ( |
| 642 | struct acpi_processor_performance * performance, |
| 643 | unsigned int cpu) |
| 644 | { |
| 645 | struct acpi_processor *pr; |
| 646 | |
| 647 | ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance"); |
| 648 | |
| 649 | down(&performance_sem); |
| 650 | |
| 651 | pr = processors[cpu]; |
| 652 | if (!pr) { |
| 653 | up(&performance_sem); |
| 654 | return_VOID; |
| 655 | } |
| 656 | |
| 657 | kfree(pr->performance->states); |
| 658 | pr->performance = NULL; |
| 659 | |
| 660 | acpi_cpufreq_remove_file(pr); |
| 661 | |
| 662 | up(&performance_sem); |
| 663 | |
| 664 | return_VOID; |
| 665 | } |
| 666 | EXPORT_SYMBOL(acpi_processor_unregister_performance); |