| 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/proc_fs.h> |
| 44 | #include <linux/seq_file.h> |
| 45 | #include <linux/dmi.h> |
| 46 | #include <linux/moduleparam.h> |
| 47 | #include <linux/cpuidle.h> |
| 48 | |
| 49 | #include <asm/io.h> |
| 50 | #include <asm/system.h> |
| 51 | #include <asm/cpu.h> |
| 52 | #include <asm/delay.h> |
| 53 | #include <asm/uaccess.h> |
| 54 | #include <asm/processor.h> |
| 55 | #include <asm/smp.h> |
| 56 | #include <asm/acpi.h> |
| 57 | |
| 58 | #include <acpi/acpi_bus.h> |
| 59 | #include <acpi/acpi_drivers.h> |
| 60 | #include <acpi/processor.h> |
| 61 | |
| 62 | #define ACPI_PROCESSOR_CLASS "processor" |
| 63 | #define ACPI_PROCESSOR_DEVICE_NAME "Processor" |
| 64 | #define ACPI_PROCESSOR_FILE_INFO "info" |
| 65 | #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" |
| 66 | #define ACPI_PROCESSOR_FILE_LIMIT "limit" |
| 67 | #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
| 68 | #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 |
| 69 | #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
| 70 | |
| 71 | #define ACPI_PROCESSOR_LIMIT_USER 0 |
| 72 | #define ACPI_PROCESSOR_LIMIT_THERMAL 1 |
| 73 | |
| 74 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
| 75 | ACPI_MODULE_NAME("processor_core"); |
| 76 | |
| 77 | MODULE_AUTHOR("Paul Diefenbaugh"); |
| 78 | MODULE_DESCRIPTION("ACPI Processor Driver"); |
| 79 | MODULE_LICENSE("GPL"); |
| 80 | |
| 81 | static int acpi_processor_add(struct acpi_device *device); |
| 82 | static int acpi_processor_start(struct acpi_device *device); |
| 83 | static int acpi_processor_remove(struct acpi_device *device, int type); |
| 84 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); |
| 85 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); |
| 86 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); |
| 87 | static int acpi_processor_handle_eject(struct acpi_processor *pr); |
| 88 | |
| 89 | |
| 90 | static const struct acpi_device_id processor_device_ids[] = { |
| 91 | {ACPI_PROCESSOR_OBJECT_HID, 0}, |
| 92 | {ACPI_PROCESSOR_HID, 0}, |
| 93 | {"", 0}, |
| 94 | }; |
| 95 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); |
| 96 | |
| 97 | static struct acpi_driver acpi_processor_driver = { |
| 98 | .name = "processor", |
| 99 | .class = ACPI_PROCESSOR_CLASS, |
| 100 | .ids = processor_device_ids, |
| 101 | .ops = { |
| 102 | .add = acpi_processor_add, |
| 103 | .remove = acpi_processor_remove, |
| 104 | .start = acpi_processor_start, |
| 105 | .suspend = acpi_processor_suspend, |
| 106 | .resume = acpi_processor_resume, |
| 107 | }, |
| 108 | }; |
| 109 | |
| 110 | #define INSTALL_NOTIFY_HANDLER 1 |
| 111 | #define UNINSTALL_NOTIFY_HANDLER 2 |
| 112 | |
| 113 | static const struct file_operations acpi_processor_info_fops = { |
| 114 | .owner = THIS_MODULE, |
| 115 | .open = acpi_processor_info_open_fs, |
| 116 | .read = seq_read, |
| 117 | .llseek = seq_lseek, |
| 118 | .release = single_release, |
| 119 | }; |
| 120 | |
| 121 | DEFINE_PER_CPU(struct acpi_processor *, processors); |
| 122 | struct acpi_processor_errata errata __read_mostly; |
| 123 | static int set_no_mwait(const struct dmi_system_id *id) |
| 124 | { |
| 125 | printk(KERN_NOTICE PREFIX "%s detected - " |
| 126 | "disabling mwait for CPU C-states\n", id->ident); |
| 127 | idle_nomwait = 1; |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { |
| 132 | { |
| 133 | set_no_mwait, "IFL91 board", { |
| 134 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), |
| 135 | DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"), |
| 136 | DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"), |
| 137 | DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL}, |
| 138 | { |
| 139 | set_no_mwait, "Extensa 5220", { |
| 140 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 141 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| 142 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), |
| 143 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, |
| 144 | {}, |
| 145 | }; |
| 146 | |
| 147 | /* -------------------------------------------------------------------------- |
| 148 | Errata Handling |
| 149 | -------------------------------------------------------------------------- */ |
| 150 | |
| 151 | static int acpi_processor_errata_piix4(struct pci_dev *dev) |
| 152 | { |
| 153 | u8 value1 = 0; |
| 154 | u8 value2 = 0; |
| 155 | |
| 156 | |
| 157 | if (!dev) |
| 158 | return -EINVAL; |
| 159 | |
| 160 | /* |
| 161 | * Note that 'dev' references the PIIX4 ACPI Controller. |
| 162 | */ |
| 163 | |
| 164 | switch (dev->revision) { |
| 165 | case 0: |
| 166 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); |
| 167 | break; |
| 168 | case 1: |
| 169 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); |
| 170 | break; |
| 171 | case 2: |
| 172 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); |
| 173 | break; |
| 174 | case 3: |
| 175 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); |
| 176 | break; |
| 177 | default: |
| 178 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | switch (dev->revision) { |
| 183 | |
| 184 | case 0: /* PIIX4 A-step */ |
| 185 | case 1: /* PIIX4 B-step */ |
| 186 | /* |
| 187 | * See specification changes #13 ("Manual Throttle Duty Cycle") |
| 188 | * and #14 ("Enabling and Disabling Manual Throttle"), plus |
| 189 | * erratum #5 ("STPCLK# Deassertion Time") from the January |
| 190 | * 2002 PIIX4 specification update. Applies to only older |
| 191 | * PIIX4 models. |
| 192 | */ |
| 193 | errata.piix4.throttle = 1; |
| 194 | |
| 195 | case 2: /* PIIX4E */ |
| 196 | case 3: /* PIIX4M */ |
| 197 | /* |
| 198 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA |
| 199 | * Livelock") from the January 2002 PIIX4 specification update. |
| 200 | * Applies to all PIIX4 models. |
| 201 | */ |
| 202 | |
| 203 | /* |
| 204 | * BM-IDE |
| 205 | * ------ |
| 206 | * Find the PIIX4 IDE Controller and get the Bus Master IDE |
| 207 | * Status register address. We'll use this later to read |
| 208 | * each IDE controller's DMA status to make sure we catch all |
| 209 | * DMA activity. |
| 210 | */ |
| 211 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 212 | PCI_DEVICE_ID_INTEL_82371AB, |
| 213 | PCI_ANY_ID, PCI_ANY_ID, NULL); |
| 214 | if (dev) { |
| 215 | errata.piix4.bmisx = pci_resource_start(dev, 4); |
| 216 | pci_dev_put(dev); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Type-F DMA |
| 221 | * ---------- |
| 222 | * Find the PIIX4 ISA Controller and read the Motherboard |
| 223 | * DMA controller's status to see if Type-F (Fast) DMA mode |
| 224 | * is enabled (bit 7) on either channel. Note that we'll |
| 225 | * disable C3 support if this is enabled, as some legacy |
| 226 | * devices won't operate well if fast DMA is disabled. |
| 227 | */ |
| 228 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 229 | PCI_DEVICE_ID_INTEL_82371AB_0, |
| 230 | PCI_ANY_ID, PCI_ANY_ID, NULL); |
| 231 | if (dev) { |
| 232 | pci_read_config_byte(dev, 0x76, &value1); |
| 233 | pci_read_config_byte(dev, 0x77, &value2); |
| 234 | if ((value1 & 0x80) || (value2 & 0x80)) |
| 235 | errata.piix4.fdma = 1; |
| 236 | pci_dev_put(dev); |
| 237 | } |
| 238 | |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | if (errata.piix4.bmisx) |
| 243 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 244 | "Bus master activity detection (BM-IDE) erratum enabled\n")); |
| 245 | if (errata.piix4.fdma) |
| 246 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 247 | "Type-F DMA livelock erratum (C3 disabled)\n")); |
| 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static int acpi_processor_errata(struct acpi_processor *pr) |
| 253 | { |
| 254 | int result = 0; |
| 255 | struct pci_dev *dev = NULL; |
| 256 | |
| 257 | |
| 258 | if (!pr) |
| 259 | return -EINVAL; |
| 260 | |
| 261 | /* |
| 262 | * PIIX4 |
| 263 | */ |
| 264 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
| 265 | PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
| 266 | PCI_ANY_ID, NULL); |
| 267 | if (dev) { |
| 268 | result = acpi_processor_errata_piix4(dev); |
| 269 | pci_dev_put(dev); |
| 270 | } |
| 271 | |
| 272 | return result; |
| 273 | } |
| 274 | |
| 275 | /* -------------------------------------------------------------------------- |
| 276 | Common ACPI processor functions |
| 277 | -------------------------------------------------------------------------- */ |
| 278 | |
| 279 | /* |
| 280 | * _PDC is required for a BIOS-OS handshake for most of the newer |
| 281 | * ACPI processor features. |
| 282 | */ |
| 283 | static int acpi_processor_set_pdc(struct acpi_processor *pr) |
| 284 | { |
| 285 | struct acpi_object_list *pdc_in = pr->pdc; |
| 286 | acpi_status status = AE_OK; |
| 287 | |
| 288 | |
| 289 | if (!pdc_in) |
| 290 | return status; |
| 291 | if (idle_nomwait) { |
| 292 | /* |
| 293 | * If mwait is disabled for CPU C-states, the C2C3_FFH access |
| 294 | * mode will be disabled in the parameter of _PDC object. |
| 295 | * Of course C1_FFH access mode will also be disabled. |
| 296 | */ |
| 297 | union acpi_object *obj; |
| 298 | u32 *buffer = NULL; |
| 299 | |
| 300 | obj = pdc_in->pointer; |
| 301 | buffer = (u32 *)(obj->buffer.pointer); |
| 302 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); |
| 303 | |
| 304 | } |
| 305 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); |
| 306 | |
| 307 | if (ACPI_FAILURE(status)) |
| 308 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 309 | "Could not evaluate _PDC, using legacy perf. control...\n")); |
| 310 | |
| 311 | return status; |
| 312 | } |
| 313 | |
| 314 | /* -------------------------------------------------------------------------- |
| 315 | FS Interface (/proc) |
| 316 | -------------------------------------------------------------------------- */ |
| 317 | |
| 318 | static struct proc_dir_entry *acpi_processor_dir = NULL; |
| 319 | |
| 320 | static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) |
| 321 | { |
| 322 | struct acpi_processor *pr = seq->private; |
| 323 | |
| 324 | |
| 325 | if (!pr) |
| 326 | goto end; |
| 327 | |
| 328 | seq_printf(seq, "processor id: %d\n" |
| 329 | "acpi id: %d\n" |
| 330 | "bus mastering control: %s\n" |
| 331 | "power management: %s\n" |
| 332 | "throttling control: %s\n" |
| 333 | "limit interface: %s\n", |
| 334 | pr->id, |
| 335 | pr->acpi_id, |
| 336 | pr->flags.bm_control ? "yes" : "no", |
| 337 | pr->flags.power ? "yes" : "no", |
| 338 | pr->flags.throttling ? "yes" : "no", |
| 339 | pr->flags.limit ? "yes" : "no"); |
| 340 | |
| 341 | end: |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) |
| 346 | { |
| 347 | return single_open(file, acpi_processor_info_seq_show, |
| 348 | PDE(inode)->data); |
| 349 | } |
| 350 | |
| 351 | static int acpi_processor_add_fs(struct acpi_device *device) |
| 352 | { |
| 353 | struct proc_dir_entry *entry = NULL; |
| 354 | |
| 355 | |
| 356 | if (!acpi_device_dir(device)) { |
| 357 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), |
| 358 | acpi_processor_dir); |
| 359 | if (!acpi_device_dir(device)) |
| 360 | return -ENODEV; |
| 361 | } |
| 362 | acpi_device_dir(device)->owner = THIS_MODULE; |
| 363 | |
| 364 | /* 'info' [R] */ |
| 365 | entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, |
| 366 | S_IRUGO, acpi_device_dir(device), |
| 367 | &acpi_processor_info_fops, |
| 368 | acpi_driver_data(device)); |
| 369 | if (!entry) |
| 370 | return -EIO; |
| 371 | |
| 372 | /* 'throttling' [R/W] */ |
| 373 | entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, |
| 374 | S_IFREG | S_IRUGO | S_IWUSR, |
| 375 | acpi_device_dir(device), |
| 376 | &acpi_processor_throttling_fops, |
| 377 | acpi_driver_data(device)); |
| 378 | if (!entry) |
| 379 | return -EIO; |
| 380 | |
| 381 | /* 'limit' [R/W] */ |
| 382 | entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, |
| 383 | S_IFREG | S_IRUGO | S_IWUSR, |
| 384 | acpi_device_dir(device), |
| 385 | &acpi_processor_limit_fops, |
| 386 | acpi_driver_data(device)); |
| 387 | if (!entry) |
| 388 | return -EIO; |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static int acpi_processor_remove_fs(struct acpi_device *device) |
| 393 | { |
| 394 | |
| 395 | if (acpi_device_dir(device)) { |
| 396 | remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, |
| 397 | acpi_device_dir(device)); |
| 398 | remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, |
| 399 | acpi_device_dir(device)); |
| 400 | remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, |
| 401 | acpi_device_dir(device)); |
| 402 | remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); |
| 403 | acpi_device_dir(device) = NULL; |
| 404 | } |
| 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | /* Use the acpiid in MADT to map cpus in case of SMP */ |
| 410 | |
| 411 | #ifndef CONFIG_SMP |
| 412 | static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } |
| 413 | #else |
| 414 | |
| 415 | static struct acpi_table_madt *madt; |
| 416 | |
| 417 | static int map_lapic_id(struct acpi_subtable_header *entry, |
| 418 | u32 acpi_id, int *apic_id) |
| 419 | { |
| 420 | struct acpi_madt_local_apic *lapic = |
| 421 | (struct acpi_madt_local_apic *)entry; |
| 422 | if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && |
| 423 | lapic->processor_id == acpi_id) { |
| 424 | *apic_id = lapic->id; |
| 425 | return 1; |
| 426 | } |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int map_lsapic_id(struct acpi_subtable_header *entry, |
| 431 | int device_declaration, u32 acpi_id, int *apic_id) |
| 432 | { |
| 433 | struct acpi_madt_local_sapic *lsapic = |
| 434 | (struct acpi_madt_local_sapic *)entry; |
| 435 | u32 tmp = (lsapic->id << 8) | lsapic->eid; |
| 436 | |
| 437 | /* Only check enabled APICs*/ |
| 438 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
| 439 | return 0; |
| 440 | |
| 441 | /* Device statement declaration type */ |
| 442 | if (device_declaration) { |
| 443 | if (entry->length < 16) |
| 444 | printk(KERN_ERR PREFIX |
| 445 | "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", |
| 446 | tmp); |
| 447 | else if (lsapic->uid == acpi_id) |
| 448 | goto found; |
| 449 | /* Processor statement declaration type */ |
| 450 | } else if (lsapic->processor_id == acpi_id) |
| 451 | goto found; |
| 452 | |
| 453 | return 0; |
| 454 | found: |
| 455 | *apic_id = tmp; |
| 456 | return 1; |
| 457 | } |
| 458 | |
| 459 | static int map_madt_entry(int type, u32 acpi_id) |
| 460 | { |
| 461 | unsigned long madt_end, entry; |
| 462 | int apic_id = -1; |
| 463 | |
| 464 | if (!madt) |
| 465 | return apic_id; |
| 466 | |
| 467 | entry = (unsigned long)madt; |
| 468 | madt_end = entry + madt->header.length; |
| 469 | |
| 470 | /* Parse all entries looking for a match. */ |
| 471 | |
| 472 | entry += sizeof(struct acpi_table_madt); |
| 473 | while (entry + sizeof(struct acpi_subtable_header) < madt_end) { |
| 474 | struct acpi_subtable_header *header = |
| 475 | (struct acpi_subtable_header *)entry; |
| 476 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
| 477 | if (map_lapic_id(header, acpi_id, &apic_id)) |
| 478 | break; |
| 479 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
| 480 | if (map_lsapic_id(header, type, acpi_id, &apic_id)) |
| 481 | break; |
| 482 | } |
| 483 | entry += header->length; |
| 484 | } |
| 485 | return apic_id; |
| 486 | } |
| 487 | |
| 488 | static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) |
| 489 | { |
| 490 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 491 | union acpi_object *obj; |
| 492 | struct acpi_subtable_header *header; |
| 493 | int apic_id = -1; |
| 494 | |
| 495 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) |
| 496 | goto exit; |
| 497 | |
| 498 | if (!buffer.length || !buffer.pointer) |
| 499 | goto exit; |
| 500 | |
| 501 | obj = buffer.pointer; |
| 502 | if (obj->type != ACPI_TYPE_BUFFER || |
| 503 | obj->buffer.length < sizeof(struct acpi_subtable_header)) { |
| 504 | goto exit; |
| 505 | } |
| 506 | |
| 507 | header = (struct acpi_subtable_header *)obj->buffer.pointer; |
| 508 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
| 509 | map_lapic_id(header, acpi_id, &apic_id); |
| 510 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
| 511 | map_lsapic_id(header, type, acpi_id, &apic_id); |
| 512 | } |
| 513 | |
| 514 | exit: |
| 515 | if (buffer.pointer) |
| 516 | kfree(buffer.pointer); |
| 517 | return apic_id; |
| 518 | } |
| 519 | |
| 520 | static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) |
| 521 | { |
| 522 | int i; |
| 523 | int apic_id = -1; |
| 524 | |
| 525 | apic_id = map_mat_entry(handle, type, acpi_id); |
| 526 | if (apic_id == -1) |
| 527 | apic_id = map_madt_entry(type, acpi_id); |
| 528 | if (apic_id == -1) |
| 529 | return apic_id; |
| 530 | |
| 531 | for_each_possible_cpu(i) { |
| 532 | if (cpu_physical_id(i) == apic_id) |
| 533 | return i; |
| 534 | } |
| 535 | return -1; |
| 536 | } |
| 537 | #endif |
| 538 | |
| 539 | /* -------------------------------------------------------------------------- |
| 540 | Driver Interface |
| 541 | -------------------------------------------------------------------------- */ |
| 542 | |
| 543 | static int acpi_processor_get_info(struct acpi_device *device) |
| 544 | { |
| 545 | acpi_status status = 0; |
| 546 | union acpi_object object = { 0 }; |
| 547 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
| 548 | struct acpi_processor *pr; |
| 549 | int cpu_index, device_declaration = 0; |
| 550 | static int cpu0_initialized; |
| 551 | |
| 552 | pr = acpi_driver_data(device); |
| 553 | if (!pr) |
| 554 | return -EINVAL; |
| 555 | |
| 556 | if (num_online_cpus() > 1) |
| 557 | errata.smp = TRUE; |
| 558 | |
| 559 | acpi_processor_errata(pr); |
| 560 | |
| 561 | /* |
| 562 | * Check to see if we have bus mastering arbitration control. This |
| 563 | * is required for proper C3 usage (to maintain cache coherency). |
| 564 | */ |
| 565 | if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { |
| 566 | pr->flags.bm_control = 1; |
| 567 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 568 | "Bus mastering arbitration control present\n")); |
| 569 | } else |
| 570 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 571 | "No bus mastering arbitration control\n")); |
| 572 | |
| 573 | if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_HID)) { |
| 574 | /* |
| 575 | * Declared with "Device" statement; match _UID. |
| 576 | * Note that we don't handle string _UIDs yet. |
| 577 | */ |
| 578 | unsigned long long value; |
| 579 | status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, |
| 580 | NULL, &value); |
| 581 | if (ACPI_FAILURE(status)) { |
| 582 | printk(KERN_ERR PREFIX |
| 583 | "Evaluating processor _UID [%#x]\n", status); |
| 584 | return -ENODEV; |
| 585 | } |
| 586 | device_declaration = 1; |
| 587 | pr->acpi_id = value; |
| 588 | } else { |
| 589 | /* Declared with "Processor" statement; match ProcessorID */ |
| 590 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); |
| 591 | if (ACPI_FAILURE(status)) { |
| 592 | printk(KERN_ERR PREFIX "Evaluating processor object\n"); |
| 593 | return -ENODEV; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. |
| 598 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in |
| 599 | * arch/xxx/acpi.c |
| 600 | */ |
| 601 | pr->acpi_id = object.processor.proc_id; |
| 602 | } |
| 603 | cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); |
| 604 | |
| 605 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
| 606 | if (!cpu0_initialized && (cpu_index == -1) && |
| 607 | (num_online_cpus() == 1)) { |
| 608 | cpu_index = 0; |
| 609 | } |
| 610 | |
| 611 | cpu0_initialized = 1; |
| 612 | |
| 613 | pr->id = cpu_index; |
| 614 | |
| 615 | /* |
| 616 | * Extra Processor objects may be enumerated on MP systems with |
| 617 | * less than the max # of CPUs. They should be ignored _iff |
| 618 | * they are physically not present. |
| 619 | */ |
| 620 | if (pr->id == -1) { |
| 621 | if (ACPI_FAILURE |
| 622 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { |
| 623 | return -ENODEV; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, |
| 628 | pr->acpi_id)); |
| 629 | |
| 630 | if (!object.processor.pblk_address) |
| 631 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); |
| 632 | else if (object.processor.pblk_length != 6) |
| 633 | printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", |
| 634 | object.processor.pblk_length); |
| 635 | else { |
| 636 | pr->throttling.address = object.processor.pblk_address; |
| 637 | pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; |
| 638 | pr->throttling.duty_width = acpi_gbl_FADT.duty_width; |
| 639 | |
| 640 | pr->pblk = object.processor.pblk_address; |
| 641 | |
| 642 | /* |
| 643 | * We don't care about error returns - we just try to mark |
| 644 | * these reserved so that nobody else is confused into thinking |
| 645 | * that this region might be unused.. |
| 646 | * |
| 647 | * (In particular, allocating the IO range for Cardbus) |
| 648 | */ |
| 649 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * If ACPI describes a slot number for this CPU, we can use it |
| 654 | * ensure we get the right value in the "physical id" field |
| 655 | * of /proc/cpuinfo |
| 656 | */ |
| 657 | status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); |
| 658 | if (ACPI_SUCCESS(status)) |
| 659 | arch_fix_phys_package_id(pr->id, object.integer.value); |
| 660 | |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | static DEFINE_PER_CPU(void *, processor_device_array); |
| 665 | |
| 666 | static int __cpuinit acpi_processor_start(struct acpi_device *device) |
| 667 | { |
| 668 | int result = 0; |
| 669 | acpi_status status = AE_OK; |
| 670 | struct acpi_processor *pr; |
| 671 | struct sys_device *sysdev; |
| 672 | |
| 673 | pr = acpi_driver_data(device); |
| 674 | |
| 675 | result = acpi_processor_get_info(device); |
| 676 | if (result) { |
| 677 | /* Processor is physically not present */ |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); |
| 682 | |
| 683 | /* |
| 684 | * Buggy BIOS check |
| 685 | * ACPI id of processors can be reported wrongly by the BIOS. |
| 686 | * Don't trust it blindly |
| 687 | */ |
| 688 | if (per_cpu(processor_device_array, pr->id) != NULL && |
| 689 | per_cpu(processor_device_array, pr->id) != device) { |
| 690 | printk(KERN_WARNING "BIOS reported wrong ACPI id " |
| 691 | "for the processor\n"); |
| 692 | return -ENODEV; |
| 693 | } |
| 694 | per_cpu(processor_device_array, pr->id) = device; |
| 695 | |
| 696 | per_cpu(processors, pr->id) = pr; |
| 697 | |
| 698 | result = acpi_processor_add_fs(device); |
| 699 | if (result) |
| 700 | goto end; |
| 701 | |
| 702 | sysdev = get_cpu_sysdev(pr->id); |
| 703 | if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) |
| 704 | return -EFAULT; |
| 705 | |
| 706 | status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, |
| 707 | acpi_processor_notify, pr); |
| 708 | |
| 709 | /* _PDC call should be done before doing anything else (if reqd.). */ |
| 710 | arch_acpi_processor_init_pdc(pr); |
| 711 | acpi_processor_set_pdc(pr); |
| 712 | #ifdef CONFIG_CPU_FREQ |
| 713 | acpi_processor_ppc_has_changed(pr); |
| 714 | #endif |
| 715 | acpi_processor_get_throttling_info(pr); |
| 716 | acpi_processor_get_limit_info(pr); |
| 717 | |
| 718 | |
| 719 | acpi_processor_power_init(pr, device); |
| 720 | |
| 721 | pr->cdev = thermal_cooling_device_register("Processor", device, |
| 722 | &processor_cooling_ops); |
| 723 | if (IS_ERR(pr->cdev)) { |
| 724 | result = PTR_ERR(pr->cdev); |
| 725 | goto end; |
| 726 | } |
| 727 | |
| 728 | dev_info(&device->dev, "registered as cooling_device%d\n", |
| 729 | pr->cdev->id); |
| 730 | |
| 731 | result = sysfs_create_link(&device->dev.kobj, |
| 732 | &pr->cdev->device.kobj, |
| 733 | "thermal_cooling"); |
| 734 | if (result) |
| 735 | printk(KERN_ERR PREFIX "Create sysfs link\n"); |
| 736 | result = sysfs_create_link(&pr->cdev->device.kobj, |
| 737 | &device->dev.kobj, |
| 738 | "device"); |
| 739 | if (result) |
| 740 | printk(KERN_ERR PREFIX "Create sysfs link\n"); |
| 741 | |
| 742 | if (pr->flags.throttling) { |
| 743 | printk(KERN_INFO PREFIX "%s [%s] (supports", |
| 744 | acpi_device_name(device), acpi_device_bid(device)); |
| 745 | printk(" %d throttling states", pr->throttling.state_count); |
| 746 | printk(")\n"); |
| 747 | } |
| 748 | |
| 749 | end: |
| 750 | |
| 751 | return result; |
| 752 | } |
| 753 | |
| 754 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
| 755 | { |
| 756 | struct acpi_processor *pr = data; |
| 757 | struct acpi_device *device = NULL; |
| 758 | int saved; |
| 759 | |
| 760 | if (!pr) |
| 761 | return; |
| 762 | |
| 763 | if (acpi_bus_get_device(pr->handle, &device)) |
| 764 | return; |
| 765 | |
| 766 | switch (event) { |
| 767 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: |
| 768 | saved = pr->performance_platform_limit; |
| 769 | acpi_processor_ppc_has_changed(pr); |
| 770 | if (saved == pr->performance_platform_limit) |
| 771 | break; |
| 772 | acpi_bus_generate_proc_event(device, event, |
| 773 | pr->performance_platform_limit); |
| 774 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 775 | dev_name(&device->dev), event, |
| 776 | pr->performance_platform_limit); |
| 777 | break; |
| 778 | case ACPI_PROCESSOR_NOTIFY_POWER: |
| 779 | acpi_processor_cst_has_changed(pr); |
| 780 | acpi_bus_generate_proc_event(device, event, 0); |
| 781 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 782 | dev_name(&device->dev), event, 0); |
| 783 | break; |
| 784 | case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
| 785 | acpi_processor_tstate_has_changed(pr); |
| 786 | acpi_bus_generate_proc_event(device, event, 0); |
| 787 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
| 788 | dev_name(&device->dev), event, 0); |
| 789 | default: |
| 790 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 791 | "Unsupported event [0x%x]\n", event)); |
| 792 | break; |
| 793 | } |
| 794 | |
| 795 | return; |
| 796 | } |
| 797 | |
| 798 | static int acpi_cpu_soft_notify(struct notifier_block *nfb, |
| 799 | unsigned long action, void *hcpu) |
| 800 | { |
| 801 | unsigned int cpu = (unsigned long)hcpu; |
| 802 | struct acpi_processor *pr = per_cpu(processors, cpu); |
| 803 | |
| 804 | if (action == CPU_ONLINE && pr) { |
| 805 | acpi_processor_ppc_has_changed(pr); |
| 806 | acpi_processor_cst_has_changed(pr); |
| 807 | acpi_processor_tstate_has_changed(pr); |
| 808 | } |
| 809 | return NOTIFY_OK; |
| 810 | } |
| 811 | |
| 812 | static struct notifier_block acpi_cpu_notifier = |
| 813 | { |
| 814 | .notifier_call = acpi_cpu_soft_notify, |
| 815 | }; |
| 816 | |
| 817 | static int acpi_processor_add(struct acpi_device *device) |
| 818 | { |
| 819 | struct acpi_processor *pr = NULL; |
| 820 | |
| 821 | |
| 822 | if (!device) |
| 823 | return -EINVAL; |
| 824 | |
| 825 | pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); |
| 826 | if (!pr) |
| 827 | return -ENOMEM; |
| 828 | |
| 829 | if (!alloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { |
| 830 | kfree(pr); |
| 831 | return -ENOMEM; |
| 832 | } |
| 833 | |
| 834 | pr->handle = device->handle; |
| 835 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); |
| 836 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); |
| 837 | device->driver_data = pr; |
| 838 | |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | static int acpi_processor_remove(struct acpi_device *device, int type) |
| 843 | { |
| 844 | acpi_status status = AE_OK; |
| 845 | struct acpi_processor *pr = NULL; |
| 846 | |
| 847 | |
| 848 | if (!device || !acpi_driver_data(device)) |
| 849 | return -EINVAL; |
| 850 | |
| 851 | pr = acpi_driver_data(device); |
| 852 | |
| 853 | if (pr->id >= nr_cpu_ids) |
| 854 | goto free; |
| 855 | |
| 856 | if (type == ACPI_BUS_REMOVAL_EJECT) { |
| 857 | if (acpi_processor_handle_eject(pr)) |
| 858 | return -EINVAL; |
| 859 | } |
| 860 | |
| 861 | acpi_processor_power_exit(pr, device); |
| 862 | |
| 863 | status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, |
| 864 | acpi_processor_notify); |
| 865 | |
| 866 | sysfs_remove_link(&device->dev.kobj, "sysdev"); |
| 867 | |
| 868 | acpi_processor_remove_fs(device); |
| 869 | |
| 870 | if (pr->cdev) { |
| 871 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
| 872 | sysfs_remove_link(&pr->cdev->device.kobj, "device"); |
| 873 | thermal_cooling_device_unregister(pr->cdev); |
| 874 | pr->cdev = NULL; |
| 875 | } |
| 876 | |
| 877 | per_cpu(processors, pr->id) = NULL; |
| 878 | per_cpu(processor_device_array, pr->id) = NULL; |
| 879 | |
| 880 | free: |
| 881 | free_cpumask_var(pr->throttling.shared_cpu_map); |
| 882 | kfree(pr); |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 888 | /**************************************************************************** |
| 889 | * Acpi processor hotplug support * |
| 890 | ****************************************************************************/ |
| 891 | |
| 892 | static int is_processor_present(acpi_handle handle) |
| 893 | { |
| 894 | acpi_status status; |
| 895 | unsigned long long sta = 0; |
| 896 | |
| 897 | |
| 898 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| 899 | |
| 900 | if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) |
| 901 | return 1; |
| 902 | |
| 903 | /* |
| 904 | * _STA is mandatory for a processor that supports hot plug |
| 905 | */ |
| 906 | if (status == AE_NOT_FOUND) |
| 907 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 908 | "Processor does not support hot plug\n")); |
| 909 | else |
| 910 | ACPI_EXCEPTION((AE_INFO, status, |
| 911 | "Processor Device is not present")); |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | static |
| 916 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
| 917 | { |
| 918 | acpi_handle phandle; |
| 919 | struct acpi_device *pdev; |
| 920 | struct acpi_processor *pr; |
| 921 | |
| 922 | |
| 923 | if (acpi_get_parent(handle, &phandle)) { |
| 924 | return -ENODEV; |
| 925 | } |
| 926 | |
| 927 | if (acpi_bus_get_device(phandle, &pdev)) { |
| 928 | return -ENODEV; |
| 929 | } |
| 930 | |
| 931 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { |
| 932 | return -ENODEV; |
| 933 | } |
| 934 | |
| 935 | acpi_bus_start(*device); |
| 936 | |
| 937 | pr = acpi_driver_data(*device); |
| 938 | if (!pr) |
| 939 | return -ENODEV; |
| 940 | |
| 941 | if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { |
| 942 | kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); |
| 943 | } |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | static void __ref acpi_processor_hotplug_notify(acpi_handle handle, |
| 948 | u32 event, void *data) |
| 949 | { |
| 950 | struct acpi_processor *pr; |
| 951 | struct acpi_device *device = NULL; |
| 952 | int result; |
| 953 | |
| 954 | |
| 955 | switch (event) { |
| 956 | case ACPI_NOTIFY_BUS_CHECK: |
| 957 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 958 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 959 | "Processor driver received %s event\n", |
| 960 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
| 961 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK")); |
| 962 | |
| 963 | if (!is_processor_present(handle)) |
| 964 | break; |
| 965 | |
| 966 | if (acpi_bus_get_device(handle, &device)) { |
| 967 | result = acpi_processor_device_add(handle, &device); |
| 968 | if (result) |
| 969 | printk(KERN_ERR PREFIX |
| 970 | "Unable to add the device\n"); |
| 971 | break; |
| 972 | } |
| 973 | |
| 974 | pr = acpi_driver_data(device); |
| 975 | if (!pr) { |
| 976 | printk(KERN_ERR PREFIX "Driver data is NULL\n"); |
| 977 | break; |
| 978 | } |
| 979 | |
| 980 | if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { |
| 981 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
| 982 | break; |
| 983 | } |
| 984 | |
| 985 | result = acpi_processor_start(device); |
| 986 | if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { |
| 987 | kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); |
| 988 | } else { |
| 989 | printk(KERN_ERR PREFIX "Device [%s] failed to start\n", |
| 990 | acpi_device_bid(device)); |
| 991 | } |
| 992 | break; |
| 993 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 994 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 995 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); |
| 996 | |
| 997 | if (acpi_bus_get_device(handle, &device)) { |
| 998 | printk(KERN_ERR PREFIX |
| 999 | "Device don't exist, dropping EJECT\n"); |
| 1000 | break; |
| 1001 | } |
| 1002 | pr = acpi_driver_data(device); |
| 1003 | if (!pr) { |
| 1004 | printk(KERN_ERR PREFIX |
| 1005 | "Driver data is NULL, dropping EJECT\n"); |
| 1006 | return; |
| 1007 | } |
| 1008 | |
| 1009 | if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) |
| 1010 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
| 1011 | break; |
| 1012 | default: |
| 1013 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 1014 | "Unsupported event [0x%x]\n", event)); |
| 1015 | break; |
| 1016 | } |
| 1017 | |
| 1018 | return; |
| 1019 | } |
| 1020 | |
| 1021 | static acpi_status |
| 1022 | processor_walk_namespace_cb(acpi_handle handle, |
| 1023 | u32 lvl, void *context, void **rv) |
| 1024 | { |
| 1025 | acpi_status status; |
| 1026 | int *action = context; |
| 1027 | acpi_object_type type = 0; |
| 1028 | |
| 1029 | status = acpi_get_type(handle, &type); |
| 1030 | if (ACPI_FAILURE(status)) |
| 1031 | return (AE_OK); |
| 1032 | |
| 1033 | if (type != ACPI_TYPE_PROCESSOR) |
| 1034 | return (AE_OK); |
| 1035 | |
| 1036 | switch (*action) { |
| 1037 | case INSTALL_NOTIFY_HANDLER: |
| 1038 | acpi_install_notify_handler(handle, |
| 1039 | ACPI_SYSTEM_NOTIFY, |
| 1040 | acpi_processor_hotplug_notify, |
| 1041 | NULL); |
| 1042 | break; |
| 1043 | case UNINSTALL_NOTIFY_HANDLER: |
| 1044 | acpi_remove_notify_handler(handle, |
| 1045 | ACPI_SYSTEM_NOTIFY, |
| 1046 | acpi_processor_hotplug_notify); |
| 1047 | break; |
| 1048 | default: |
| 1049 | break; |
| 1050 | } |
| 1051 | |
| 1052 | return (AE_OK); |
| 1053 | } |
| 1054 | |
| 1055 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
| 1056 | { |
| 1057 | |
| 1058 | if (!is_processor_present(handle)) { |
| 1059 | return AE_ERROR; |
| 1060 | } |
| 1061 | |
| 1062 | if (acpi_map_lsapic(handle, p_cpu)) |
| 1063 | return AE_ERROR; |
| 1064 | |
| 1065 | if (arch_register_cpu(*p_cpu)) { |
| 1066 | acpi_unmap_lsapic(*p_cpu); |
| 1067 | return AE_ERROR; |
| 1068 | } |
| 1069 | |
| 1070 | return AE_OK; |
| 1071 | } |
| 1072 | |
| 1073 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
| 1074 | { |
| 1075 | if (cpu_online(pr->id)) |
| 1076 | cpu_down(pr->id); |
| 1077 | |
| 1078 | arch_unregister_cpu(pr->id); |
| 1079 | acpi_unmap_lsapic(pr->id); |
| 1080 | return (0); |
| 1081 | } |
| 1082 | #else |
| 1083 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
| 1084 | { |
| 1085 | return AE_ERROR; |
| 1086 | } |
| 1087 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
| 1088 | { |
| 1089 | return (-EINVAL); |
| 1090 | } |
| 1091 | #endif |
| 1092 | |
| 1093 | static |
| 1094 | void acpi_processor_install_hotplug_notify(void) |
| 1095 | { |
| 1096 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 1097 | int action = INSTALL_NOTIFY_HANDLER; |
| 1098 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, |
| 1099 | ACPI_ROOT_OBJECT, |
| 1100 | ACPI_UINT32_MAX, |
| 1101 | processor_walk_namespace_cb, &action, NULL); |
| 1102 | #endif |
| 1103 | register_hotcpu_notifier(&acpi_cpu_notifier); |
| 1104 | } |
| 1105 | |
| 1106 | static |
| 1107 | void acpi_processor_uninstall_hotplug_notify(void) |
| 1108 | { |
| 1109 | #ifdef CONFIG_ACPI_HOTPLUG_CPU |
| 1110 | int action = UNINSTALL_NOTIFY_HANDLER; |
| 1111 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, |
| 1112 | ACPI_ROOT_OBJECT, |
| 1113 | ACPI_UINT32_MAX, |
| 1114 | processor_walk_namespace_cb, &action, NULL); |
| 1115 | #endif |
| 1116 | unregister_hotcpu_notifier(&acpi_cpu_notifier); |
| 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * We keep the driver loaded even when ACPI is not running. |
| 1121 | * This is needed for the powernow-k8 driver, that works even without |
| 1122 | * ACPI, but needs symbols from this driver |
| 1123 | */ |
| 1124 | |
| 1125 | static int __init acpi_processor_init(void) |
| 1126 | { |
| 1127 | int result = 0; |
| 1128 | |
| 1129 | memset(&errata, 0, sizeof(errata)); |
| 1130 | |
| 1131 | #ifdef CONFIG_SMP |
| 1132 | if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, |
| 1133 | (struct acpi_table_header **)&madt))) |
| 1134 | madt = NULL; |
| 1135 | #endif |
| 1136 | |
| 1137 | acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); |
| 1138 | if (!acpi_processor_dir) |
| 1139 | return -ENOMEM; |
| 1140 | acpi_processor_dir->owner = THIS_MODULE; |
| 1141 | |
| 1142 | /* |
| 1143 | * Check whether the system is DMI table. If yes, OSPM |
| 1144 | * should not use mwait for CPU-states. |
| 1145 | */ |
| 1146 | dmi_check_system(processor_idle_dmi_table); |
| 1147 | result = cpuidle_register_driver(&acpi_idle_driver); |
| 1148 | if (result < 0) |
| 1149 | goto out_proc; |
| 1150 | |
| 1151 | result = acpi_bus_register_driver(&acpi_processor_driver); |
| 1152 | if (result < 0) |
| 1153 | goto out_cpuidle; |
| 1154 | |
| 1155 | acpi_processor_install_hotplug_notify(); |
| 1156 | |
| 1157 | acpi_thermal_cpufreq_init(); |
| 1158 | |
| 1159 | acpi_processor_ppc_init(); |
| 1160 | |
| 1161 | acpi_processor_throttling_init(); |
| 1162 | |
| 1163 | return 0; |
| 1164 | |
| 1165 | out_cpuidle: |
| 1166 | cpuidle_unregister_driver(&acpi_idle_driver); |
| 1167 | |
| 1168 | out_proc: |
| 1169 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); |
| 1170 | |
| 1171 | return result; |
| 1172 | } |
| 1173 | |
| 1174 | static void __exit acpi_processor_exit(void) |
| 1175 | { |
| 1176 | acpi_processor_ppc_exit(); |
| 1177 | |
| 1178 | acpi_thermal_cpufreq_exit(); |
| 1179 | |
| 1180 | acpi_processor_uninstall_hotplug_notify(); |
| 1181 | |
| 1182 | acpi_bus_unregister_driver(&acpi_processor_driver); |
| 1183 | |
| 1184 | cpuidle_unregister_driver(&acpi_idle_driver); |
| 1185 | |
| 1186 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); |
| 1187 | |
| 1188 | return; |
| 1189 | } |
| 1190 | |
| 1191 | module_init(acpi_processor_init); |
| 1192 | module_exit(acpi_processor_exit); |
| 1193 | |
| 1194 | EXPORT_SYMBOL(acpi_processor_set_thermal_limit); |
| 1195 | |
| 1196 | MODULE_ALIAS("processor"); |