| 1 | /* |
| 2 | * acpi_processor.c - ACPI Processor Driver ($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 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or (at |
| 15 | * your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 25 | * |
| 26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 27 | * TBD: |
| 28 | * 1. Make # power states dynamic. |
| 29 | * 2. Support duty_cycle values that span bit 4. |
| 30 | * 3. Optimize by having scheduler determine business instead of |
| 31 | * having us try to calculate it here. |
| 32 | * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this. |
| 33 | */ |
| 34 | |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/types.h> |
| 39 | #include <linux/pci.h> |
| 40 | #include <linux/pm.h> |
| 41 | #include <linux/cpufreq.h> |
| 42 | #include <linux/cpu.h> |
| 43 | #include <linux/dmi.h> |
| 44 | #include <linux/moduleparam.h> |
| 45 | #include <linux/cpuidle.h> |
| 46 | #include <linux/slab.h> |
| 47 | |
| 48 | #include <asm/io.h> |
| 49 | #include <asm/system.h> |
| 50 | #include <asm/cpu.h> |
| 51 | #include <asm/delay.h> |
| 52 | #include <asm/uaccess.h> |
| 53 | #include <asm/processor.h> |
| 54 | #include <asm/smp.h> |
| 55 | #include <asm/acpi.h> |
| 56 | |
| 57 | #include <acpi/acpi_bus.h> |
| 58 | #include <acpi/acpi_drivers.h> |
| 59 | #include <acpi/processor.h> |
| 60 | |
| 61 | #define PREFIX "ACPI: " |
| 62 | |
| 63 | #define ACPI_PROCESSOR_CLASS "processor" |
| 64 | #define ACPI_PROCESSOR_DEVICE_NAME "Processor" |
| 65 | #define ACPI_PROCESSOR_FILE_INFO "info" |
| 66 | #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" |
| 67 | #define ACPI_PROCESSOR_FILE_LIMIT "limit" |
| 68 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
| 69 | #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 |
| 70 | #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
| 71 | |
| 72 | #define ACPI_PROCESSOR_LIMIT_USER 0 |
| 73 | #define ACPI_PROCESSOR_LIMIT_THERMAL 1 |
| 74 | |
| 75 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
| 76 | ACPI_MODULE_NAME("processor_driver"); |
| 77 | |
| 78 | MODULE_AUTHOR("Paul Diefenbaugh"); |
| 79 | MODULE_DESCRIPTION("ACPI Processor Driver"); |
| 80 | MODULE_LICENSE("GPL"); |
| 81 | |
| 82 | static int acpi_processor_add(struct acpi_device *device); |
| 83 | static int acpi_processor_remove(struct acpi_device *device, int type); |
| 84 | static void acpi_processor_notify(struct acpi_device *device, u32 event); |
| 85 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); |
| 86 | static int acpi_processor_handle_eject(struct acpi_processor *pr); |
| 87 | |
| 88 | |
| 89 | static const struct acpi_device_id processor_device_ids[] = { |
| 90 | {ACPI_PROCESSOR_OBJECT_HID, 0}, |
| 91 | {"ACPI0007", 0}, |
| 92 | {"", 0}, |
| 93 | }; |
| 94 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); |
| 95 | |
| 96 | static struct acpi_driver acpi_processor_driver = { |
| 97 | .name = "processor", |
| 98 | .class = ACPI_PROCESSOR_CLASS, |
| 99 | .ids = processor_device_ids, |
| 100 | .ops = { |
| 101 | .add = acpi_processor_add, |
| 102 | .remove = acpi_processor_remove, |
| 103 | .suspend = acpi_processor_suspend, |
| 104 | .resume = acpi_processor_resume, |
| 105 | .notify = acpi_processor_notify, |
| 106 | }, |
| 107 | }; |
| 108 | |
| 109 | #define INSTALL_NOTIFY_HANDLER 1 |
| 110 | #define UNINSTALL_NOTIFY_HANDLER 2 |
| 111 | |
| 112 | DEFINE_PER_CPU(struct acpi_processor *, processors); |
| 113 | EXPORT_PER_CPU_SYMBOL(processors); |
| 114 | |
| 115 | struct acpi_processor_errata errata __read_mostly; |
| 116 | |
| 117 | /* -------------------------------------------------------------------------- |
| 118 | Errata Handling |
| 119 | -------------------------------------------------------------------------- */ |
| 120 | |
| 121 | static int acpi_processor_errata_piix4(struct pci_dev *dev) |
| 122 | { |
| 123 | u8 value1 = 0; |
| 124 | u8 value2 = 0; |
| 125 | |
| 126 | |
| 127 | if (!dev) |
| 128 | return -EINVAL; |
| 129 | |
| 130 | /* |
| 131 | * Note that 'dev' references the PIIX4 ACPI Controller. |
| 132 | */ |
| 133 | |
| 134 | switch (dev->revision) { |
| 135 | case 0: |
| 136 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); |
| 137 | break; |
| 138 | case 1: |
| 139 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); |
| 140 | break; |
| 141 | case 2: |
| 142 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); |
| 143 | break; |
| 144 | case 3: |
| 145 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); |
| 146 | break; |
| 147 | default: |
| 148 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); |
| 149 | break; |
| 150 | } |
| 151 | |
| 152 | switch (dev->revision) { |
| 153 | |
| 154 | case 0: /* PIIX4 A-step */ |
| 155 | case 1: /* PIIX4 B-step */ |
| 156 | /* |
| 157 | * See specification changes #13 ("Manual Throttle Duty Cycle") |
| 158 | * and #14 ("Enabling and Disabling Manual Throttle"), plus |
| 159 | * erratum #5 ("STPCLK# Deassertion Time") from the January |
| 160 | * 2002 PIIX4 specification update. Applies to only older |
| 161 | * PIIX4 models. |
| 162 | */ |
| 163 | errata.piix4.throttle = 1; |
| 164 | |
| 165 | case 2: /* PIIX4E */ |
| 166 | case 3: /* PIIX4M */ |
| 167 | /* |
| 168 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA |
| 169 | * Livelock") from the January 2002 PIIX4 specification update. |
| 170 | * Applies to all PIIX4 models. |
| 171 | */ |
| 172 | |
| 173 | /* |
| 174 | * BM-IDE |
| 175 | * ------ |
| 176 | * Find the PIIX4 IDE Controller and get the Bus Master IDE |
| 177 | * Status register address. We'll use this later to read |
| 178 | * each IDE controller's DMA status to make sure we catch all |
| 179 | * DMA activity. |
| 180 | */ |
| 181 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 182 | PCI_DEVICE_ID_INTEL_82371AB, |
| 183 | PCI_ANY_ID, PCI_ANY_ID, NULL); |
| 184 | if (dev) { |
| 185 | errata.piix4.bmisx = pci_resource_start(dev, 4); |
| 186 | pci_dev_put(dev); |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * Type-F DMA |
| 191 | * ---------- |
| 192 | * Find the PIIX4 ISA Controller and read the Motherboard |
| 193 | * DMA controller's status to see if Type-F (Fast) DMA mode |
| 194 | * is enabled (bit 7) on either channel. Note that we'll |
| 195 | * disable C3 support if this is enabled, as some legacy |
| 196 | * devices won't operate well if fast DMA is disabled. |
| 197 | */ |
| 198 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 199 | PCI_DEVICE_ID_INTEL_82371AB_0, |
| 200 | PCI_ANY_ID, PCI_ANY_ID, NULL); |
| 201 | if (dev) { |
| 202 | pci_read_config_byte(dev, 0x76, &value1); |
| 203 | pci_read_config_byte(dev, 0x77, &value2); |
| 204 | if ((value1 & 0x80) || (value2 & 0x80)) |
| 205 | errata.piix4.fdma = 1; |
| 206 | pci_dev_put(dev); |
| 207 | } |
| 208 | |
| 209 | break; |
| 210 | } |
| 211 | |
| 212 | if (errata.piix4.bmisx) |
| 213 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 214 | "Bus master activity detection (BM-IDE) erratum enabled\n")); |
| 215 | if (errata.piix4.fdma) |
| 216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 217 | "Type-F DMA livelock erratum (C3 disabled)\n")); |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | static int acpi_processor_errata(struct acpi_processor *pr) |
| 223 | { |
| 224 | int result = 0; |
| 225 | struct pci_dev *dev = NULL; |
| 226 | |
| 227 | |
| 228 | if (!pr) |
| 229 | return -EINVAL; |
| 230 | |
| 231 | /* |
| 232 | * PIIX4 |
| 233 | */ |
| 234 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 235 | PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
| 236 | PCI_ANY_ID, NULL); |
| 237 | if (dev) { |
| 238 | result = acpi_processor_errata_piix4(dev); |
| 239 | pci_dev_put(dev); |
| 240 | } |
| 241 | |
| 242 | return result; |
| 243 | } |
| 244 | |
| 245 | /* -------------------------------------------------------------------------- |
| 246 | Driver Interface |
| 247 | -------------------------------------------------------------------------- */ |
| 248 | |
| 249 | static int acpi_processor_get_info(struct acpi_device *device) |
| 250 | { |
| 251 | acpi_status status = 0; |
| 252 | union acpi_object object = { 0 }; |
| 253 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
| 254 | struct acpi_processor *pr; |
| 255 | int cpu_index, device_declaration = 0; |
| 256 | static int cpu0_initialized; |
| 257 | |
| 258 | pr = acpi_driver_data(device); |
| 259 | if (!pr) |
| 260 | return -EINVAL; |
| 261 | |
| 262 | if (num_online_cpus() > 1) |
| 263 | errata.smp = TRUE; |
| 264 | |
| 265 | acpi_processor_errata(pr); |
| 266 | |
| 267 | /* |
| 268 | * Check to see if we have bus mastering arbitration control. This |
| 269 | * is required for proper C3 usage (to maintain cache coherency). |
| 270 | */ |
| 271 | if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { |
| 272 | pr->flags.bm_control = 1; |
| 273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 274 | "Bus mastering arbitration control present\n")); |
| 275 | } else |
| 276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 277 | "No bus mastering arbitration control\n")); |
| 278 | |
| 279 | if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { |
| 280 | /* Declared with "Processor" statement; match ProcessorID */ |
| 281 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); |
| 282 | if (ACPI_FAILURE(status)) { |
| 283 | printk(KERN_ERR PREFIX "Evaluating processor object\n"); |
| 284 | return -ENODEV; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. |
| 289 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in |
| 290 | * arch/xxx/acpi.c |
| 291 | */ |
| 292 | pr->acpi_id = object.processor.proc_id; |
| 293 | } else { |
| 294 | /* |
| 295 | * Declared with "Device" statement; match _UID. |
| 296 | * Note that we don't handle string _UIDs yet. |
| 297 | */ |
| 298 | unsigned long long value; |
| 299 | status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, |
| 300 | NULL, &value); |
| 301 | if (ACPI_FAILURE(status)) { |
| 302 | printk(KERN_ERR PREFIX |
| 303 | "Evaluating processor _UID [%#x]\n", status); |
| 304 | return -ENODEV; |
| 305 | } |
| 306 | device_declaration = 1; |
| 307 | pr->acpi_id = value; |
| 308 | } |
| 309 | cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id); |
| 310 | |
| 311 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
| 312 | if (!cpu0_initialized && (cpu_index == -1) && |
| 313 | (num_online_cpus() == 1)) { |
| 314 | cpu_index = 0; |
| 315 | } |
| 316 | |
| 317 | cpu0_initialized = 1; |
| 318 | |
| 319 | pr->id = cpu_index; |
| 320 | |
| 321 | /* |
| 322 | * Extra Processor objects may be enumerated on MP systems with |
| 323 | * less than the max # of CPUs. They should be ignored _iff |
| 324 | * they are physically not present. |
| 325 | */ |
| 326 | if (pr->id == -1) { |
| 327 | if (ACPI_FAILURE |
| 328 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { |
| 329 | return -ENODEV; |
| 330 | } |
| 331 | } |
| 332 | /* |
| 333 | * On some boxes several processors use the same processor bus id. |
| 334 | * But they are located in different scope. For example: |
| 335 | * \_SB.SCK0.CPU0 |
| 336 | * \_SB.SCK1.CPU0 |
| 337 | * Rename the processor device bus id. And the new bus id will be |
| 338 | * generated as the following format: |
| 339 | * CPU+CPU ID. |
| 340 | */ |
| 341 | sprintf(acpi_device_bid(device), "CPU%X", pr->id); |
| 342 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, |
| 343 | pr->acpi_id)); |
| 344 | |
| 345 | if (!object.processor.pblk_address) |
| 346 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); |
| 347 | else if (object.processor.pblk_length != 6) |
| 348 | printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", |
| 349 | object.processor.pblk_length); |
| 350 | else { |
| 351 | pr->throttling.address = object.processor.pblk_address; |
| 352 | pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; |
| 353 | pr->throttling.duty_width = acpi_gbl_FADT.duty_width; |
| 354 | |
| 355 | pr->pblk = object.processor.pblk_address; |
| 356 | |
| 357 | /* |
| 358 | * We don't care about error returns - we just try to mark |
| 359 | * these reserved so that nobody else is confused into thinking |
| 360 | * that this region might be unused.. |
| 361 | * |
| 362 | * (In particular, allocating the IO range for Cardbus) |
| 363 | */ |
| 364 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * If ACPI describes a slot number for this CPU, we can use it |
| 369 | * ensure we get the right value in the "physical id" field |
| 370 | * of /proc/cpuinfo |
| 371 | */ |
| 372 | status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); |
| 373 | if (ACPI_SUCCESS(status)) |
| 374 | arch_fix_phys_package_id(pr->id, object.integer.value); |
| 375 | |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | static DEFINE_PER_CPU(void *, processor_device_array); |
| 380 | |
| 381 | static void acpi_processor_notify(struct acpi_device *device, u32 event) |
| 382 | { |
| 383 | struct acpi_processor *pr = acpi_driver_data(device); |
| 384 | int saved; |
| 385 | |
| 386 | if (!pr) |
| 387 | return; |
| 388 | |
| 389 | switch (event) { |
| 390 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: |
| 391 | saved = pr->performance_platform_limit; |
| 392 | acpi_processor_ppc_has_changed(pr, 1); |
| 393 | if (saved == pr->performance_platform_limit) |
| 394 | break; |
| 395 | acpi_bus_generate_proc_event(device, event, |
| 396 | pr->performance_platform_limit); |
| 397 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 398 | dev_name(&device->dev), event, |
| 399 | pr->performance_platform_limit); |
| 400 | break; |
| 401 | case ACPI_PROCESSOR_NOTIFY_POWER: |
| 402 | acpi_processor_cst_has_changed(pr); |
| 403 | acpi_bus_generate_proc_event(device, event, 0); |
| 404 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 405 | dev_name(&device->dev), event, 0); |
| 406 | break; |
| 407 | case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
| 408 | acpi_processor_tstate_has_changed(pr); |
| 409 | acpi_bus_generate_proc_event(device, event, 0); |
| 410 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 411 | dev_name(&device->dev), event, 0); |
| 412 | default: |
| 413 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 414 | "Unsupported event [0x%x]\n", event)); |
| 415 | break; |
| 416 | } |
| 417 | |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | static int acpi_cpu_soft_notify(struct notifier_block *nfb, |
| 422 | unsigned long action, void *hcpu) |
| 423 | { |
| 424 | unsigned int cpu = (unsigned long)hcpu; |
| 425 | struct acpi_processor *pr = per_cpu(processors, cpu); |
| 426 | |
| 427 | if (action == CPU_ONLINE && pr) { |
| 428 | acpi_processor_ppc_has_changed(pr, 0); |
| 429 | acpi_processor_hotplug(pr); |
| 430 | acpi_processor_reevaluate_tstate(pr, action); |
| 431 | acpi_processor_tstate_has_changed(pr); |
| 432 | } |
| 433 | if (action == CPU_DEAD && pr) { |
| 434 | /* invalidate the flag.throttling after one CPU is offline */ |
| 435 | acpi_processor_reevaluate_tstate(pr, action); |
| 436 | } |
| 437 | return NOTIFY_OK; |
| 438 | } |
| 439 | |
| 440 | static struct notifier_block acpi_cpu_notifier = |
| 441 | { |
| 442 | .notifier_call = acpi_cpu_soft_notify, |
| 443 | }; |
| 444 | |
| 445 | static int __cpuinit acpi_processor_add(struct acpi_device *device) |
| 446 | { |
| 447 | struct acpi_processor *pr = NULL; |
| 448 | int result = 0; |
| 449 | struct device *dev; |
| 450 | |
| 451 | pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); |
| 452 | if (!pr) |
| 453 | return -ENOMEM; |
| 454 | |
| 455 | if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { |
| 456 | kfree(pr); |
| 457 | return -ENOMEM; |
| 458 | } |
| 459 | |
| 460 | pr->handle = device->handle; |
| 461 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); |
| 462 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); |
| 463 | device->driver_data = pr; |
| 464 | |
| 465 | result = acpi_processor_get_info(device); |
| 466 | if (result) { |
| 467 | /* Processor is physically not present */ |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | #ifdef CONFIG_SMP |
| 472 | if (pr->id >= setup_max_cpus && pr->id != 0) |
| 473 | return 0; |
| 474 | #endif |
| 475 | |
| 476 | BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); |
| 477 | |
| 478 | /* |
| 479 | * Buggy BIOS check |
| 480 | * ACPI id of processors can be reported wrongly by the BIOS. |
| 481 | * Don't trust it blindly |
| 482 | */ |
| 483 | if (per_cpu(processor_device_array, pr->id) != NULL && |
| 484 | per_cpu(processor_device_array, pr->id) != device) { |
| 485 | printk(KERN_WARNING "BIOS reported wrong ACPI id " |
| 486 | "for the processor\n"); |
| 487 | result = -ENODEV; |
| 488 | goto err_free_cpumask; |
| 489 | } |
| 490 | per_cpu(processor_device_array, pr->id) = device; |
| 491 | |
| 492 | per_cpu(processors, pr->id) = pr; |
| 493 | |
| 494 | dev = get_cpu_device(pr->id); |
| 495 | if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) { |
| 496 | result = -EFAULT; |
| 497 | goto err_free_cpumask; |
| 498 | } |
| 499 | |
| 500 | #ifdef CONFIG_CPU_FREQ |
| 501 | acpi_processor_ppc_has_changed(pr, 0); |
| 502 | #endif |
| 503 | acpi_processor_get_throttling_info(pr); |
| 504 | acpi_processor_get_limit_info(pr); |
| 505 | |
| 506 | if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) |
| 507 | acpi_processor_power_init(pr, device); |
| 508 | |
| 509 | pr->cdev = thermal_cooling_device_register("Processor", device, |
| 510 | &processor_cooling_ops); |
| 511 | if (IS_ERR(pr->cdev)) { |
| 512 | result = PTR_ERR(pr->cdev); |
| 513 | goto err_power_exit; |
| 514 | } |
| 515 | |
| 516 | dev_dbg(&device->dev, "registered as cooling_device%d\n", |
| 517 | pr->cdev->id); |
| 518 | |
| 519 | result = sysfs_create_link(&device->dev.kobj, |
| 520 | &pr->cdev->device.kobj, |
| 521 | "thermal_cooling"); |
| 522 | if (result) { |
| 523 | printk(KERN_ERR PREFIX "Create sysfs link\n"); |
| 524 | goto err_thermal_unregister; |
| 525 | } |
| 526 | result = sysfs_create_link(&pr->cdev->device.kobj, |
| 527 | &device->dev.kobj, |
| 528 | "device"); |
| 529 | if (result) { |
| 530 | printk(KERN_ERR PREFIX "Create sysfs link\n"); |
| 531 | goto err_remove_sysfs; |
| 532 | } |
| 533 | |
| 534 | return 0; |
| 535 | |
| 536 | err_remove_sysfs: |
| 537 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
| 538 | err_thermal_unregister: |
| 539 | thermal_cooling_device_unregister(pr->cdev); |
| 540 | err_power_exit: |
| 541 | acpi_processor_power_exit(pr, device); |
| 542 | err_free_cpumask: |
| 543 | free_cpumask_var(pr->throttling.shared_cpu_map); |
| 544 | |
| 545 | return result; |
| 546 | } |
| 547 | |
| 548 | static int acpi_processor_remove(struct acpi_device *device, int type) |
| 549 | { |
| 550 | struct acpi_processor *pr = NULL; |
| 551 | |
| 552 | |
| 553 | if (!device || !acpi_driver_data(device)) |
| 554 | return -EINVAL; |
| 555 | |
| 556 | pr = acpi_driver_data(device); |
| 557 | |
| 558 | if (pr->id >= nr_cpu_ids) |
| 559 | goto free; |
| 560 | |
| 561 | if (type == ACPI_BUS_REMOVAL_EJECT) { |
| 562 | if (acpi_processor_handle_eject(pr)) |
| 563 | return -EINVAL; |
| 564 | } |
| 565 | |
| 566 | acpi_processor_power_exit(pr, device); |
| 567 | |
| 568 | sysfs_remove_link(&device->dev.kobj, "sysdev"); |
| 569 | |
| 570 | if (pr->cdev) { |
| 571 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
| 572 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); |
| 573 | thermal_cooling_device_unregister(pr->cdev); |
| 574 | pr->cdev = NULL; |
| 575 | } |
| 576 | |
| 577 | per_cpu(processors, pr->id) = NULL; |
| 578 | per_cpu(processor_device_array, pr->id) = NULL; |
| 579 | |
| 580 | free: |
| 581 | free_cpumask_var(pr->throttling.shared_cpu_map); |
| 582 | kfree(pr); |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 588 | /**************************************************************************** |
| 589 | * Acpi processor hotplug support * |
| 590 | ****************************************************************************/ |
| 591 | |
| 592 | static int is_processor_present(acpi_handle handle) |
| 593 | { |
| 594 | acpi_status status; |
| 595 | unsigned long long sta = 0; |
| 596 | |
| 597 | |
| 598 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| 599 | |
| 600 | if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) |
| 601 | return 1; |
| 602 | |
| 603 | /* |
| 604 | * _STA is mandatory for a processor that supports hot plug |
| 605 | */ |
| 606 | if (status == AE_NOT_FOUND) |
| 607 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 608 | "Processor does not support hot plug\n")); |
| 609 | else |
| 610 | ACPI_EXCEPTION((AE_INFO, status, |
| 611 | "Processor Device is not present")); |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | static |
| 616 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
| 617 | { |
| 618 | acpi_handle phandle; |
| 619 | struct acpi_device *pdev; |
| 620 | |
| 621 | |
| 622 | if (acpi_get_parent(handle, &phandle)) { |
| 623 | return -ENODEV; |
| 624 | } |
| 625 | |
| 626 | if (acpi_bus_get_device(phandle, &pdev)) { |
| 627 | return -ENODEV; |
| 628 | } |
| 629 | |
| 630 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { |
| 631 | return -ENODEV; |
| 632 | } |
| 633 | |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | static void acpi_processor_hotplug_notify(acpi_handle handle, |
| 638 | u32 event, void *data) |
| 639 | { |
| 640 | struct acpi_processor *pr; |
| 641 | struct acpi_device *device = NULL; |
| 642 | int result; |
| 643 | |
| 644 | |
| 645 | switch (event) { |
| 646 | case ACPI_NOTIFY_BUS_CHECK: |
| 647 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 648 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 649 | "Processor driver received %s event\n", |
| 650 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
| 651 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); |
| 652 | |
| 653 | if (!is_processor_present(handle)) |
| 654 | break; |
| 655 | |
| 656 | if (acpi_bus_get_device(handle, &device)) { |
| 657 | result = acpi_processor_device_add(handle, &device); |
| 658 | if (result) |
| 659 | printk(KERN_ERR PREFIX |
| 660 | "Unable to add the device\n"); |
| 661 | break; |
| 662 | } |
| 663 | break; |
| 664 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 665 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 666 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); |
| 667 | |
| 668 | if (acpi_bus_get_device(handle, &device)) { |
| 669 | printk(KERN_ERR PREFIX |
| 670 | "Device don't exist, dropping EJECT\n"); |
| 671 | break; |
| 672 | } |
| 673 | pr = acpi_driver_data(device); |
| 674 | if (!pr) { |
| 675 | printk(KERN_ERR PREFIX |
| 676 | "Driver data is NULL, dropping EJECT\n"); |
| 677 | return; |
| 678 | } |
| 679 | break; |
| 680 | default: |
| 681 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 682 | "Unsupported event [0x%x]\n", event)); |
| 683 | break; |
| 684 | } |
| 685 | |
| 686 | return; |
| 687 | } |
| 688 | |
| 689 | static acpi_status |
| 690 | processor_walk_namespace_cb(acpi_handle handle, |
| 691 | u32 lvl, void *context, void **rv) |
| 692 | { |
| 693 | acpi_status status; |
| 694 | int *action = context; |
| 695 | acpi_object_type type = 0; |
| 696 | |
| 697 | status = acpi_get_type(handle, &type); |
| 698 | if (ACPI_FAILURE(status)) |
| 699 | return (AE_OK); |
| 700 | |
| 701 | if (type != ACPI_TYPE_PROCESSOR) |
| 702 | return (AE_OK); |
| 703 | |
| 704 | switch (*action) { |
| 705 | case INSTALL_NOTIFY_HANDLER: |
| 706 | acpi_install_notify_handler(handle, |
| 707 | ACPI_SYSTEM_NOTIFY, |
| 708 | acpi_processor_hotplug_notify, |
| 709 | NULL); |
| 710 | break; |
| 711 | case UNINSTALL_NOTIFY_HANDLER: |
| 712 | acpi_remove_notify_handler(handle, |
| 713 | ACPI_SYSTEM_NOTIFY, |
| 714 | acpi_processor_hotplug_notify); |
| 715 | break; |
| 716 | default: |
| 717 | break; |
| 718 | } |
| 719 | |
| 720 | return (AE_OK); |
| 721 | } |
| 722 | |
| 723 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
| 724 | { |
| 725 | |
| 726 | if (!is_processor_present(handle)) { |
| 727 | return AE_ERROR; |
| 728 | } |
| 729 | |
| 730 | if (acpi_map_lsapic(handle, p_cpu)) |
| 731 | return AE_ERROR; |
| 732 | |
| 733 | if (arch_register_cpu(*p_cpu)) { |
| 734 | acpi_unmap_lsapic(*p_cpu); |
| 735 | return AE_ERROR; |
| 736 | } |
| 737 | |
| 738 | return AE_OK; |
| 739 | } |
| 740 | |
| 741 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
| 742 | { |
| 743 | if (cpu_online(pr->id)) |
| 744 | cpu_down(pr->id); |
| 745 | |
| 746 | arch_unregister_cpu(pr->id); |
| 747 | acpi_unmap_lsapic(pr->id); |
| 748 | return (0); |
| 749 | } |
| 750 | #else |
| 751 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
| 752 | { |
| 753 | return AE_ERROR; |
| 754 | } |
| 755 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
| 756 | { |
| 757 | return (-EINVAL); |
| 758 | } |
| 759 | #endif |
| 760 | |
| 761 | static |
| 762 | void acpi_processor_install_hotplug_notify(void) |
| 763 | { |
| 764 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 765 | int action = INSTALL_NOTIFY_HANDLER; |
| 766 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, |
| 767 | ACPI_ROOT_OBJECT, |
| 768 | ACPI_UINT32_MAX, |
| 769 | processor_walk_namespace_cb, NULL, &action, NULL); |
| 770 | #endif |
| 771 | register_hotcpu_notifier(&acpi_cpu_notifier); |
| 772 | } |
| 773 | |
| 774 | static |
| 775 | void acpi_processor_uninstall_hotplug_notify(void) |
| 776 | { |
| 777 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 778 | int action = UNINSTALL_NOTIFY_HANDLER; |
| 779 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, |
| 780 | ACPI_ROOT_OBJECT, |
| 781 | ACPI_UINT32_MAX, |
| 782 | processor_walk_namespace_cb, NULL, &action, NULL); |
| 783 | #endif |
| 784 | unregister_hotcpu_notifier(&acpi_cpu_notifier); |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * We keep the driver loaded even when ACPI is not running. |
| 789 | * This is needed for the powernow-k8 driver, that works even without |
| 790 | * ACPI, but needs symbols from this driver |
| 791 | */ |
| 792 | |
| 793 | static int __init acpi_processor_init(void) |
| 794 | { |
| 795 | int result = 0; |
| 796 | |
| 797 | if (acpi_disabled) |
| 798 | return 0; |
| 799 | |
| 800 | memset(&errata, 0, sizeof(errata)); |
| 801 | |
| 802 | result = acpi_bus_register_driver(&acpi_processor_driver); |
| 803 | if (result < 0) |
| 804 | return result; |
| 805 | |
| 806 | acpi_processor_install_hotplug_notify(); |
| 807 | |
| 808 | acpi_thermal_cpufreq_init(); |
| 809 | |
| 810 | acpi_processor_ppc_init(); |
| 811 | |
| 812 | acpi_processor_throttling_init(); |
| 813 | |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | static void __exit acpi_processor_exit(void) |
| 818 | { |
| 819 | if (acpi_disabled) |
| 820 | return; |
| 821 | |
| 822 | acpi_processor_ppc_exit(); |
| 823 | |
| 824 | acpi_thermal_cpufreq_exit(); |
| 825 | |
| 826 | acpi_processor_uninstall_hotplug_notify(); |
| 827 | |
| 828 | acpi_bus_unregister_driver(&acpi_processor_driver); |
| 829 | |
| 830 | cpuidle_unregister_driver(&acpi_idle_driver); |
| 831 | |
| 832 | return; |
| 833 | } |
| 834 | |
| 835 | module_init(acpi_processor_init); |
| 836 | module_exit(acpi_processor_exit); |
| 837 | |
| 838 | MODULE_ALIAS("processor"); |