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1da177e4 LT |
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 | ||
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 | ||
1da177e4 LT |
61 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 |
62 | #define ACPI_PROCESSOR_CLASS "processor" | |
63 | #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver" | |
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 | ||
71 | #define ACPI_PROCESSOR_LIMIT_USER 0 | |
72 | #define ACPI_PROCESSOR_LIMIT_THERMAL 1 | |
73 | ||
74 | #define ACPI_STA_PRESENT 0x00000001 | |
75 | ||
76 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
4be44fcd | 77 | ACPI_MODULE_NAME("acpi_processor") |
1da177e4 | 78 | |
4be44fcd | 79 | MODULE_AUTHOR("Paul Diefenbaugh"); |
1da177e4 LT |
80 | MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME); |
81 | MODULE_LICENSE("GPL"); | |
82 | ||
4be44fcd LB |
83 | static int acpi_processor_add(struct acpi_device *device); |
84 | static int acpi_processor_start(struct acpi_device *device); | |
85 | static int acpi_processor_remove(struct acpi_device *device, int type); | |
1da177e4 | 86 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); |
4be44fcd | 87 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data); |
1da177e4 LT |
88 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); |
89 | static int acpi_processor_handle_eject(struct acpi_processor *pr); | |
90 | ||
91 | static struct acpi_driver acpi_processor_driver = { | |
4be44fcd LB |
92 | .name = ACPI_PROCESSOR_DRIVER_NAME, |
93 | .class = ACPI_PROCESSOR_CLASS, | |
94 | .ids = ACPI_PROCESSOR_HID, | |
95 | .ops = { | |
96 | .add = acpi_processor_add, | |
97 | .remove = acpi_processor_remove, | |
98 | .start = acpi_processor_start, | |
99 | }, | |
1da177e4 LT |
100 | }; |
101 | ||
102 | #define INSTALL_NOTIFY_HANDLER 1 | |
103 | #define UNINSTALL_NOTIFY_HANDLER 2 | |
104 | ||
1da177e4 | 105 | static struct file_operations acpi_processor_info_fops = { |
4be44fcd LB |
106 | .open = acpi_processor_info_open_fs, |
107 | .read = seq_read, | |
108 | .llseek = seq_lseek, | |
109 | .release = single_release, | |
1da177e4 LT |
110 | }; |
111 | ||
4be44fcd | 112 | struct acpi_processor *processors[NR_CPUS]; |
1da177e4 LT |
113 | struct acpi_processor_errata errata; |
114 | ||
1da177e4 LT |
115 | /* -------------------------------------------------------------------------- |
116 | Errata Handling | |
117 | -------------------------------------------------------------------------- */ | |
118 | ||
4be44fcd | 119 | static int acpi_processor_errata_piix4(struct pci_dev *dev) |
1da177e4 | 120 | { |
4be44fcd LB |
121 | u8 rev = 0; |
122 | u8 value1 = 0; | |
123 | u8 value2 = 0; | |
1da177e4 LT |
124 | |
125 | ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4"); | |
126 | ||
127 | if (!dev) | |
128 | return_VALUE(-EINVAL); | |
129 | ||
130 | /* | |
131 | * Note that 'dev' references the PIIX4 ACPI Controller. | |
132 | */ | |
133 | ||
134 | pci_read_config_byte(dev, PCI_REVISION_ID, &rev); | |
135 | ||
136 | switch (rev) { | |
137 | case 0: | |
138 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); | |
139 | break; | |
140 | case 1: | |
141 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); | |
142 | break; | |
143 | case 2: | |
144 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); | |
145 | break; | |
146 | case 3: | |
147 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); | |
148 | break; | |
149 | default: | |
150 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); | |
151 | break; | |
152 | } | |
153 | ||
154 | switch (rev) { | |
155 | ||
156 | case 0: /* PIIX4 A-step */ | |
157 | case 1: /* PIIX4 B-step */ | |
158 | /* | |
159 | * See specification changes #13 ("Manual Throttle Duty Cycle") | |
160 | * and #14 ("Enabling and Disabling Manual Throttle"), plus | |
161 | * erratum #5 ("STPCLK# Deassertion Time") from the January | |
162 | * 2002 PIIX4 specification update. Applies to only older | |
163 | * PIIX4 models. | |
164 | */ | |
165 | errata.piix4.throttle = 1; | |
166 | ||
167 | case 2: /* PIIX4E */ | |
168 | case 3: /* PIIX4M */ | |
169 | /* | |
170 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA | |
171 | * Livelock") from the January 2002 PIIX4 specification update. | |
172 | * Applies to all PIIX4 models. | |
173 | */ | |
174 | ||
175 | /* | |
176 | * BM-IDE | |
177 | * ------ | |
178 | * Find the PIIX4 IDE Controller and get the Bus Master IDE | |
179 | * Status register address. We'll use this later to read | |
180 | * each IDE controller's DMA status to make sure we catch all | |
181 | * DMA activity. | |
182 | */ | |
183 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
184 | PCI_DEVICE_ID_INTEL_82371AB, |
185 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
186 | if (dev) { |
187 | errata.piix4.bmisx = pci_resource_start(dev, 4); | |
188 | pci_dev_put(dev); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Type-F DMA | |
193 | * ---------- | |
194 | * Find the PIIX4 ISA Controller and read the Motherboard | |
195 | * DMA controller's status to see if Type-F (Fast) DMA mode | |
196 | * is enabled (bit 7) on either channel. Note that we'll | |
197 | * disable C3 support if this is enabled, as some legacy | |
198 | * devices won't operate well if fast DMA is disabled. | |
199 | */ | |
200 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
201 | PCI_DEVICE_ID_INTEL_82371AB_0, |
202 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
203 | if (dev) { |
204 | pci_read_config_byte(dev, 0x76, &value1); | |
205 | pci_read_config_byte(dev, 0x77, &value2); | |
206 | if ((value1 & 0x80) || (value2 & 0x80)) | |
207 | errata.piix4.fdma = 1; | |
208 | pci_dev_put(dev); | |
209 | } | |
210 | ||
211 | break; | |
212 | } | |
213 | ||
214 | if (errata.piix4.bmisx) | |
215 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 216 | "Bus master activity detection (BM-IDE) erratum enabled\n")); |
1da177e4 LT |
217 | if (errata.piix4.fdma) |
218 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 219 | "Type-F DMA livelock erratum (C3 disabled)\n")); |
1da177e4 LT |
220 | |
221 | return_VALUE(0); | |
222 | } | |
223 | ||
8713cbef | 224 | static int acpi_processor_errata(struct acpi_processor *pr) |
1da177e4 | 225 | { |
4be44fcd LB |
226 | int result = 0; |
227 | struct pci_dev *dev = NULL; | |
1da177e4 LT |
228 | |
229 | ACPI_FUNCTION_TRACE("acpi_processor_errata"); | |
230 | ||
231 | if (!pr) | |
232 | return_VALUE(-EINVAL); | |
233 | ||
234 | /* | |
235 | * PIIX4 | |
236 | */ | |
237 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
238 | PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
239 | PCI_ANY_ID, NULL); | |
1da177e4 LT |
240 | if (dev) { |
241 | result = acpi_processor_errata_piix4(dev); | |
242 | pci_dev_put(dev); | |
243 | } | |
244 | ||
245 | return_VALUE(result); | |
246 | } | |
247 | ||
02df8b93 VP |
248 | /* -------------------------------------------------------------------------- |
249 | Common ACPI processor fucntions | |
250 | -------------------------------------------------------------------------- */ | |
251 | ||
252 | /* | |
253 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
254 | * ACPI processor features. | |
255 | */ | |
05131ecc | 256 | static int acpi_processor_set_pdc(struct acpi_processor *pr) |
02df8b93 | 257 | { |
05131ecc | 258 | struct acpi_object_list *pdc_in = pr->pdc; |
4be44fcd | 259 | acpi_status status = AE_OK; |
02df8b93 VP |
260 | |
261 | ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); | |
262 | ||
05131ecc VP |
263 | if (!pdc_in) |
264 | return_VALUE(status); | |
02df8b93 | 265 | |
05131ecc | 266 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); |
02df8b93 | 267 | |
05131ecc | 268 | if (ACPI_FAILURE(status)) |
4be44fcd | 269 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
05131ecc | 270 | "Could not evaluate _PDC, using legacy perf. control...\n")); |
02df8b93 VP |
271 | |
272 | return_VALUE(status); | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /* -------------------------------------------------------------------------- |
276 | FS Interface (/proc) | |
277 | -------------------------------------------------------------------------- */ | |
278 | ||
4be44fcd | 279 | static struct proc_dir_entry *acpi_processor_dir = NULL; |
1da177e4 LT |
280 | |
281 | static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) | |
282 | { | |
4be44fcd | 283 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
1da177e4 LT |
284 | |
285 | ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); | |
286 | ||
287 | if (!pr) | |
288 | goto end; | |
289 | ||
290 | seq_printf(seq, "processor id: %d\n" | |
4be44fcd LB |
291 | "acpi id: %d\n" |
292 | "bus mastering control: %s\n" | |
293 | "power management: %s\n" | |
294 | "throttling control: %s\n" | |
295 | "limit interface: %s\n", | |
296 | pr->id, | |
297 | pr->acpi_id, | |
298 | pr->flags.bm_control ? "yes" : "no", | |
299 | pr->flags.power ? "yes" : "no", | |
300 | pr->flags.throttling ? "yes" : "no", | |
301 | pr->flags.limit ? "yes" : "no"); | |
302 | ||
303 | end: | |
1da177e4 LT |
304 | return_VALUE(0); |
305 | } | |
306 | ||
307 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) | |
308 | { | |
309 | return single_open(file, acpi_processor_info_seq_show, | |
4be44fcd | 310 | PDE(inode)->data); |
1da177e4 LT |
311 | } |
312 | ||
4be44fcd | 313 | static int acpi_processor_add_fs(struct acpi_device *device) |
1da177e4 | 314 | { |
4be44fcd | 315 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
316 | |
317 | ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); | |
318 | ||
319 | if (!acpi_device_dir(device)) { | |
320 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 321 | acpi_processor_dir); |
1da177e4 LT |
322 | if (!acpi_device_dir(device)) |
323 | return_VALUE(-ENODEV); | |
324 | } | |
325 | acpi_device_dir(device)->owner = THIS_MODULE; | |
326 | ||
327 | /* 'info' [R] */ | |
328 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, | |
4be44fcd | 329 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
330 | if (!entry) |
331 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
332 | "Unable to create '%s' fs entry\n", |
333 | ACPI_PROCESSOR_FILE_INFO)); | |
1da177e4 LT |
334 | else { |
335 | entry->proc_fops = &acpi_processor_info_fops; | |
336 | entry->data = acpi_driver_data(device); | |
337 | entry->owner = THIS_MODULE; | |
338 | } | |
339 | ||
340 | /* 'throttling' [R/W] */ | |
341 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, | |
4be44fcd LB |
342 | S_IFREG | S_IRUGO | S_IWUSR, |
343 | acpi_device_dir(device)); | |
1da177e4 LT |
344 | if (!entry) |
345 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
346 | "Unable to create '%s' fs entry\n", |
347 | ACPI_PROCESSOR_FILE_THROTTLING)); | |
1da177e4 LT |
348 | else { |
349 | entry->proc_fops = &acpi_processor_throttling_fops; | |
1da177e4 LT |
350 | entry->data = acpi_driver_data(device); |
351 | entry->owner = THIS_MODULE; | |
352 | } | |
353 | ||
354 | /* 'limit' [R/W] */ | |
355 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
4be44fcd LB |
356 | S_IFREG | S_IRUGO | S_IWUSR, |
357 | acpi_device_dir(device)); | |
1da177e4 LT |
358 | if (!entry) |
359 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
360 | "Unable to create '%s' fs entry\n", |
361 | ACPI_PROCESSOR_FILE_LIMIT)); | |
1da177e4 LT |
362 | else { |
363 | entry->proc_fops = &acpi_processor_limit_fops; | |
1da177e4 LT |
364 | entry->data = acpi_driver_data(device); |
365 | entry->owner = THIS_MODULE; | |
366 | } | |
367 | ||
368 | return_VALUE(0); | |
369 | } | |
370 | ||
4be44fcd | 371 | static int acpi_processor_remove_fs(struct acpi_device *device) |
1da177e4 LT |
372 | { |
373 | ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); | |
374 | ||
375 | if (acpi_device_dir(device)) { | |
4be44fcd LB |
376 | remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, |
377 | acpi_device_dir(device)); | |
1da177e4 | 378 | remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, |
4be44fcd LB |
379 | acpi_device_dir(device)); |
380 | remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
381 | acpi_device_dir(device)); | |
1da177e4 LT |
382 | remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); |
383 | acpi_device_dir(device) = NULL; | |
384 | } | |
385 | ||
386 | return_VALUE(0); | |
387 | } | |
388 | ||
389 | /* Use the acpiid in MADT to map cpus in case of SMP */ | |
390 | #ifndef CONFIG_SMP | |
4a35a46b | 391 | #define convert_acpiid_to_cpu(acpi_id) (0xff) |
1da177e4 LT |
392 | #else |
393 | ||
394 | #ifdef CONFIG_IA64 | |
395 | #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid | |
396 | #define arch_cpu_to_apicid ia64_cpu_to_sapicid | |
397 | #define ARCH_BAD_APICID (0xffff) | |
398 | #else | |
399 | #define arch_acpiid_to_apicid x86_acpiid_to_apicid | |
400 | #define arch_cpu_to_apicid x86_cpu_to_apicid | |
401 | #define ARCH_BAD_APICID (0xff) | |
402 | #endif | |
403 | ||
4a35a46b | 404 | static u8 convert_acpiid_to_cpu(u8 acpi_id) |
1da177e4 LT |
405 | { |
406 | u16 apic_id; | |
4a35a46b | 407 | int i; |
1da177e4 LT |
408 | |
409 | apic_id = arch_acpiid_to_apicid[acpi_id]; | |
410 | if (apic_id == ARCH_BAD_APICID) | |
411 | return -1; | |
412 | ||
413 | for (i = 0; i < NR_CPUS; i++) { | |
4a35a46b LB |
414 | if (arch_cpu_to_apicid[i] == apic_id) |
415 | return i; | |
1da177e4 LT |
416 | } |
417 | return -1; | |
418 | } | |
419 | #endif | |
420 | ||
421 | /* -------------------------------------------------------------------------- | |
422 | Driver Interface | |
423 | -------------------------------------------------------------------------- */ | |
424 | ||
4be44fcd | 425 | static int acpi_processor_get_info(struct acpi_processor *pr) |
1da177e4 | 426 | { |
4be44fcd LB |
427 | acpi_status status = 0; |
428 | union acpi_object object = { 0 }; | |
429 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
4a35a46b | 430 | u8 cpu_index; |
4be44fcd | 431 | static int cpu0_initialized; |
1da177e4 LT |
432 | |
433 | ACPI_FUNCTION_TRACE("acpi_processor_get_info"); | |
434 | ||
435 | if (!pr) | |
436 | return_VALUE(-EINVAL); | |
437 | ||
438 | if (num_online_cpus() > 1) | |
439 | errata.smp = TRUE; | |
440 | ||
441 | acpi_processor_errata(pr); | |
442 | ||
443 | /* | |
444 | * Check to see if we have bus mastering arbitration control. This | |
445 | * is required for proper C3 usage (to maintain cache coherency). | |
446 | */ | |
447 | if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { | |
448 | pr->flags.bm_control = 1; | |
449 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
450 | "Bus mastering arbitration control present\n")); |
451 | } else | |
1da177e4 | 452 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 453 | "No bus mastering arbitration control\n")); |
1da177e4 LT |
454 | |
455 | /* | |
456 | * Evalute the processor object. Note that it is common on SMP to | |
457 | * have the first (boot) processor with a valid PBLK address while | |
458 | * all others have a NULL address. | |
459 | */ | |
460 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
461 | if (ACPI_FAILURE(status)) { | |
462 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 463 | "Error evaluating processor object\n")); |
1da177e4 LT |
464 | return_VALUE(-ENODEV); |
465 | } | |
466 | ||
467 | /* | |
468 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. | |
4be44fcd | 469 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c |
1da177e4 LT |
470 | */ |
471 | pr->acpi_id = object.processor.proc_id; | |
472 | ||
4a35a46b | 473 | cpu_index = convert_acpiid_to_cpu(pr->acpi_id); |
1da177e4 | 474 | |
4be44fcd | 475 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
4a35a46b | 476 | if (!cpu0_initialized && (cpu_index == 0xff) && |
4be44fcd LB |
477 | (num_online_cpus() == 1)) { |
478 | cpu_index = 0; | |
479 | } | |
480 | ||
481 | cpu0_initialized = 1; | |
482 | ||
483 | pr->id = cpu_index; | |
484 | ||
485 | /* | |
486 | * Extra Processor objects may be enumerated on MP systems with | |
487 | * less than the max # of CPUs. They should be ignored _iff | |
488 | * they are physically not present. | |
489 | */ | |
4a35a46b | 490 | if (cpu_index >= NR_CPUS) { |
4be44fcd LB |
491 | if (ACPI_FAILURE |
492 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { | |
4a35a46b | 493 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
4be44fcd LB |
494 | "Error getting cpuindex for acpiid 0x%x\n", |
495 | pr->acpi_id)); | |
496 | return_VALUE(-ENODEV); | |
497 | } | |
498 | } | |
1da177e4 LT |
499 | |
500 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, | |
4be44fcd | 501 | pr->acpi_id)); |
1da177e4 LT |
502 | |
503 | if (!object.processor.pblk_address) | |
504 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
505 | else if (object.processor.pblk_length != 6) | |
506 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n", | |
4be44fcd | 507 | object.processor.pblk_length)); |
1da177e4 LT |
508 | else { |
509 | pr->throttling.address = object.processor.pblk_address; | |
510 | pr->throttling.duty_offset = acpi_fadt.duty_offset; | |
511 | pr->throttling.duty_width = acpi_fadt.duty_width; | |
512 | ||
513 | pr->pblk = object.processor.pblk_address; | |
514 | ||
515 | /* | |
516 | * We don't care about error returns - we just try to mark | |
517 | * these reserved so that nobody else is confused into thinking | |
518 | * that this region might be unused.. | |
519 | * | |
520 | * (In particular, allocating the IO range for Cardbus) | |
521 | */ | |
522 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
523 | } | |
524 | ||
525 | #ifdef CONFIG_CPU_FREQ | |
526 | acpi_processor_ppc_has_changed(pr); | |
527 | #endif | |
528 | acpi_processor_get_throttling_info(pr); | |
529 | acpi_processor_get_limit_info(pr); | |
530 | ||
531 | return_VALUE(0); | |
532 | } | |
533 | ||
cd8e2b48 VP |
534 | static void *processor_device_array[NR_CPUS]; |
535 | ||
4be44fcd | 536 | static int acpi_processor_start(struct acpi_device *device) |
1da177e4 | 537 | { |
4be44fcd LB |
538 | int result = 0; |
539 | acpi_status status = AE_OK; | |
540 | struct acpi_processor *pr; | |
1da177e4 LT |
541 | |
542 | ACPI_FUNCTION_TRACE("acpi_processor_start"); | |
543 | ||
544 | pr = acpi_driver_data(device); | |
545 | ||
546 | result = acpi_processor_get_info(pr); | |
547 | if (result) { | |
548 | /* Processor is physically not present */ | |
549 | return_VALUE(0); | |
550 | } | |
551 | ||
552 | BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); | |
553 | ||
cd8e2b48 VP |
554 | /* |
555 | * Buggy BIOS check | |
556 | * ACPI id of processors can be reported wrongly by the BIOS. | |
557 | * Don't trust it blindly | |
558 | */ | |
559 | if (processor_device_array[pr->id] != NULL && | |
560 | processor_device_array[pr->id] != (void *)device) { | |
561 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id" | |
562 | "for the processor\n")); | |
563 | return_VALUE(-ENODEV); | |
564 | } | |
565 | processor_device_array[pr->id] = (void *)device; | |
566 | ||
1da177e4 LT |
567 | processors[pr->id] = pr; |
568 | ||
569 | result = acpi_processor_add_fs(device); | |
570 | if (result) | |
571 | goto end; | |
572 | ||
573 | status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 574 | acpi_processor_notify, pr); |
1da177e4 LT |
575 | if (ACPI_FAILURE(status)) { |
576 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 577 | "Error installing device notify handler\n")); |
1da177e4 LT |
578 | } |
579 | ||
05131ecc VP |
580 | /* _PDC call should be done before doing anything else (if reqd.). */ |
581 | arch_acpi_processor_init_pdc(pr); | |
582 | acpi_processor_set_pdc(pr); | |
583 | ||
1da177e4 LT |
584 | acpi_processor_power_init(pr, device); |
585 | ||
586 | if (pr->flags.throttling) { | |
587 | printk(KERN_INFO PREFIX "%s [%s] (supports", | |
4be44fcd | 588 | acpi_device_name(device), acpi_device_bid(device)); |
1da177e4 LT |
589 | printk(" %d throttling states", pr->throttling.state_count); |
590 | printk(")\n"); | |
591 | } | |
592 | ||
4be44fcd | 593 | end: |
1da177e4 LT |
594 | |
595 | return_VALUE(result); | |
596 | } | |
597 | ||
4be44fcd | 598 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 599 | { |
4be44fcd LB |
600 | struct acpi_processor *pr = (struct acpi_processor *)data; |
601 | struct acpi_device *device = NULL; | |
1da177e4 LT |
602 | |
603 | ACPI_FUNCTION_TRACE("acpi_processor_notify"); | |
604 | ||
605 | if (!pr) | |
606 | return_VOID; | |
607 | ||
608 | if (acpi_bus_get_device(pr->handle, &device)) | |
609 | return_VOID; | |
610 | ||
611 | switch (event) { | |
612 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
613 | acpi_processor_ppc_has_changed(pr); | |
614 | acpi_bus_generate_event(device, event, | |
4be44fcd | 615 | pr->performance_platform_limit); |
1da177e4 LT |
616 | break; |
617 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
618 | acpi_processor_cst_has_changed(pr); | |
619 | acpi_bus_generate_event(device, event, 0); | |
620 | break; | |
621 | default: | |
622 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 623 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
624 | break; |
625 | } | |
626 | ||
627 | return_VOID; | |
628 | } | |
629 | ||
4be44fcd | 630 | static int acpi_processor_add(struct acpi_device *device) |
1da177e4 | 631 | { |
4be44fcd | 632 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
633 | |
634 | ACPI_FUNCTION_TRACE("acpi_processor_add"); | |
635 | ||
636 | if (!device) | |
637 | return_VALUE(-EINVAL); | |
638 | ||
639 | pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
640 | if (!pr) | |
641 | return_VALUE(-ENOMEM); | |
642 | memset(pr, 0, sizeof(struct acpi_processor)); | |
643 | ||
644 | pr->handle = device->handle; | |
645 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
646 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
647 | acpi_driver_data(device) = pr; | |
648 | ||
649 | return_VALUE(0); | |
650 | } | |
651 | ||
4be44fcd | 652 | static int acpi_processor_remove(struct acpi_device *device, int type) |
1da177e4 | 653 | { |
4be44fcd LB |
654 | acpi_status status = AE_OK; |
655 | struct acpi_processor *pr = NULL; | |
1da177e4 LT |
656 | |
657 | ACPI_FUNCTION_TRACE("acpi_processor_remove"); | |
658 | ||
659 | if (!device || !acpi_driver_data(device)) | |
660 | return_VALUE(-EINVAL); | |
661 | ||
4be44fcd | 662 | pr = (struct acpi_processor *)acpi_driver_data(device); |
1da177e4 LT |
663 | |
664 | if (pr->id >= NR_CPUS) { | |
665 | kfree(pr); | |
666 | return_VALUE(0); | |
667 | } | |
668 | ||
669 | if (type == ACPI_BUS_REMOVAL_EJECT) { | |
670 | if (acpi_processor_handle_eject(pr)) | |
671 | return_VALUE(-EINVAL); | |
672 | } | |
673 | ||
674 | acpi_processor_power_exit(pr, device); | |
675 | ||
676 | status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 677 | acpi_processor_notify); |
1da177e4 LT |
678 | if (ACPI_FAILURE(status)) { |
679 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 680 | "Error removing notify handler\n")); |
1da177e4 LT |
681 | } |
682 | ||
683 | acpi_processor_remove_fs(device); | |
684 | ||
685 | processors[pr->id] = NULL; | |
686 | ||
687 | kfree(pr); | |
688 | ||
689 | return_VALUE(0); | |
690 | } | |
691 | ||
692 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
693 | /**************************************************************************** | |
694 | * Acpi processor hotplug support * | |
695 | ****************************************************************************/ | |
696 | ||
697 | static int is_processor_present(acpi_handle handle); | |
698 | ||
4be44fcd | 699 | static int is_processor_present(acpi_handle handle) |
1da177e4 | 700 | { |
4be44fcd LB |
701 | acpi_status status; |
702 | unsigned long sta = 0; | |
1da177e4 LT |
703 | |
704 | ACPI_FUNCTION_TRACE("is_processor_present"); | |
705 | ||
706 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
707 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { | |
708 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 709 | "Processor Device is not present\n")); |
1da177e4 LT |
710 | return_VALUE(0); |
711 | } | |
712 | return_VALUE(1); | |
713 | } | |
714 | ||
1da177e4 | 715 | static |
4be44fcd | 716 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
1da177e4 | 717 | { |
4be44fcd LB |
718 | acpi_handle phandle; |
719 | struct acpi_device *pdev; | |
720 | struct acpi_processor *pr; | |
1da177e4 LT |
721 | |
722 | ACPI_FUNCTION_TRACE("acpi_processor_device_add"); | |
723 | ||
724 | if (acpi_get_parent(handle, &phandle)) { | |
725 | return_VALUE(-ENODEV); | |
726 | } | |
727 | ||
728 | if (acpi_bus_get_device(phandle, &pdev)) { | |
729 | return_VALUE(-ENODEV); | |
730 | } | |
731 | ||
732 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { | |
733 | return_VALUE(-ENODEV); | |
734 | } | |
735 | ||
3fb02738 | 736 | acpi_bus_start(*device); |
1da177e4 LT |
737 | |
738 | pr = acpi_driver_data(*device); | |
739 | if (!pr) | |
740 | return_VALUE(-ENODEV); | |
741 | ||
4be44fcd | 742 | if ((pr->id >= 0) && (pr->id < NR_CPUS)) { |
312c004d | 743 | kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); |
1da177e4 LT |
744 | } |
745 | return_VALUE(0); | |
746 | } | |
747 | ||
1da177e4 | 748 | static void |
4be44fcd | 749 | acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 750 | { |
4be44fcd LB |
751 | struct acpi_processor *pr; |
752 | struct acpi_device *device = NULL; | |
1da177e4 LT |
753 | int result; |
754 | ||
755 | ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); | |
756 | ||
757 | switch (event) { | |
758 | case ACPI_NOTIFY_BUS_CHECK: | |
759 | case ACPI_NOTIFY_DEVICE_CHECK: | |
760 | printk("Processor driver received %s event\n", | |
4be44fcd LB |
761 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
762 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
763 | |
764 | if (!is_processor_present(handle)) | |
765 | break; | |
766 | ||
767 | if (acpi_bus_get_device(handle, &device)) { | |
768 | result = acpi_processor_device_add(handle, &device); | |
769 | if (result) | |
770 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 771 | "Unable to add the device\n")); |
1da177e4 LT |
772 | break; |
773 | } | |
774 | ||
775 | pr = acpi_driver_data(device); | |
776 | if (!pr) { | |
777 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 778 | "Driver data is NULL\n")); |
1da177e4 LT |
779 | break; |
780 | } | |
781 | ||
782 | if (pr->id >= 0 && (pr->id < NR_CPUS)) { | |
312c004d | 783 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
784 | break; |
785 | } | |
786 | ||
787 | result = acpi_processor_start(device); | |
4be44fcd | 788 | if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { |
312c004d | 789 | kobject_uevent(&device->kobj, KOBJ_ONLINE); |
1da177e4 LT |
790 | } else { |
791 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
792 | "Device [%s] failed to start\n", |
793 | acpi_device_bid(device))); | |
1da177e4 | 794 | } |
4be44fcd | 795 | break; |
1da177e4 | 796 | case ACPI_NOTIFY_EJECT_REQUEST: |
4be44fcd LB |
797 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
798 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); | |
1da177e4 LT |
799 | |
800 | if (acpi_bus_get_device(handle, &device)) { | |
4be44fcd LB |
801 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
802 | "Device don't exist, dropping EJECT\n")); | |
1da177e4 LT |
803 | break; |
804 | } | |
805 | pr = acpi_driver_data(device); | |
806 | if (!pr) { | |
4be44fcd LB |
807 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
808 | "Driver data is NULL, dropping EJECT\n")); | |
1da177e4 LT |
809 | return_VOID; |
810 | } | |
811 | ||
812 | if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) | |
312c004d | 813 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
814 | break; |
815 | default: | |
816 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 817 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
818 | break; |
819 | } | |
820 | ||
821 | return_VOID; | |
822 | } | |
823 | ||
824 | static acpi_status | |
825 | processor_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 826 | u32 lvl, void *context, void **rv) |
1da177e4 | 827 | { |
4be44fcd | 828 | acpi_status status; |
1da177e4 | 829 | int *action = context; |
4be44fcd | 830 | acpi_object_type type = 0; |
1da177e4 LT |
831 | |
832 | status = acpi_get_type(handle, &type); | |
833 | if (ACPI_FAILURE(status)) | |
4be44fcd | 834 | return (AE_OK); |
1da177e4 LT |
835 | |
836 | if (type != ACPI_TYPE_PROCESSOR) | |
4be44fcd | 837 | return (AE_OK); |
1da177e4 | 838 | |
4be44fcd | 839 | switch (*action) { |
1da177e4 LT |
840 | case INSTALL_NOTIFY_HANDLER: |
841 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
842 | ACPI_SYSTEM_NOTIFY, |
843 | acpi_processor_hotplug_notify, | |
844 | NULL); | |
1da177e4 LT |
845 | break; |
846 | case UNINSTALL_NOTIFY_HANDLER: | |
847 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
848 | ACPI_SYSTEM_NOTIFY, |
849 | acpi_processor_hotplug_notify); | |
1da177e4 LT |
850 | break; |
851 | default: | |
852 | break; | |
853 | } | |
854 | ||
4be44fcd | 855 | return (AE_OK); |
1da177e4 LT |
856 | } |
857 | ||
4be44fcd | 858 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
859 | { |
860 | ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); | |
861 | ||
862 | if (!is_processor_present(handle)) { | |
863 | return_VALUE(AE_ERROR); | |
864 | } | |
865 | ||
866 | if (acpi_map_lsapic(handle, p_cpu)) | |
867 | return_VALUE(AE_ERROR); | |
868 | ||
869 | if (arch_register_cpu(*p_cpu)) { | |
870 | acpi_unmap_lsapic(*p_cpu); | |
871 | return_VALUE(AE_ERROR); | |
872 | } | |
873 | ||
874 | return_VALUE(AE_OK); | |
875 | } | |
876 | ||
4be44fcd | 877 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 LT |
878 | { |
879 | if (cpu_online(pr->id)) { | |
4be44fcd | 880 | return (-EINVAL); |
1da177e4 LT |
881 | } |
882 | arch_unregister_cpu(pr->id); | |
883 | acpi_unmap_lsapic(pr->id); | |
4be44fcd | 884 | return (0); |
1da177e4 LT |
885 | } |
886 | #else | |
4be44fcd | 887 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
888 | { |
889 | return AE_ERROR; | |
890 | } | |
4be44fcd | 891 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 892 | { |
4be44fcd | 893 | return (-EINVAL); |
1da177e4 LT |
894 | } |
895 | #endif | |
896 | ||
1da177e4 LT |
897 | static |
898 | void acpi_processor_install_hotplug_notify(void) | |
899 | { | |
900 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
901 | int action = INSTALL_NOTIFY_HANDLER; | |
902 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
903 | ACPI_ROOT_OBJECT, |
904 | ACPI_UINT32_MAX, | |
905 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
906 | #endif |
907 | } | |
908 | ||
1da177e4 LT |
909 | static |
910 | void acpi_processor_uninstall_hotplug_notify(void) | |
911 | { | |
912 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
913 | int action = UNINSTALL_NOTIFY_HANDLER; | |
914 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
915 | ACPI_ROOT_OBJECT, |
916 | ACPI_UINT32_MAX, | |
917 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
918 | #endif |
919 | } | |
920 | ||
921 | /* | |
922 | * We keep the driver loaded even when ACPI is not running. | |
923 | * This is needed for the powernow-k8 driver, that works even without | |
924 | * ACPI, but needs symbols from this driver | |
925 | */ | |
926 | ||
4be44fcd | 927 | static int __init acpi_processor_init(void) |
1da177e4 | 928 | { |
4be44fcd | 929 | int result = 0; |
1da177e4 LT |
930 | |
931 | ACPI_FUNCTION_TRACE("acpi_processor_init"); | |
932 | ||
933 | memset(&processors, 0, sizeof(processors)); | |
934 | memset(&errata, 0, sizeof(errata)); | |
935 | ||
936 | acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
937 | if (!acpi_processor_dir) | |
938 | return_VALUE(0); | |
939 | acpi_processor_dir->owner = THIS_MODULE; | |
940 | ||
941 | result = acpi_bus_register_driver(&acpi_processor_driver); | |
942 | if (result < 0) { | |
943 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
944 | return_VALUE(0); | |
945 | } | |
946 | ||
947 | acpi_processor_install_hotplug_notify(); | |
948 | ||
949 | acpi_thermal_cpufreq_init(); | |
950 | ||
951 | acpi_processor_ppc_init(); | |
952 | ||
953 | return_VALUE(0); | |
954 | } | |
955 | ||
4be44fcd | 956 | static void __exit acpi_processor_exit(void) |
1da177e4 LT |
957 | { |
958 | ACPI_FUNCTION_TRACE("acpi_processor_exit"); | |
959 | ||
960 | acpi_processor_ppc_exit(); | |
961 | ||
962 | acpi_thermal_cpufreq_exit(); | |
963 | ||
964 | acpi_processor_uninstall_hotplug_notify(); | |
965 | ||
966 | acpi_bus_unregister_driver(&acpi_processor_driver); | |
967 | ||
968 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
969 | ||
970 | return_VOID; | |
971 | } | |
972 | ||
1da177e4 LT |
973 | module_init(acpi_processor_init); |
974 | module_exit(acpi_processor_exit); | |
975 | ||
976 | EXPORT_SYMBOL(acpi_processor_set_thermal_limit); | |
977 | ||
978 | MODULE_ALIAS("processor"); |