]>
Commit | Line | Data |
---|---|---|
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]; |
9f222718 | 113 | struct acpi_processor_errata errata __read_mostly; |
1da177e4 | 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 | 248 | /* -------------------------------------------------------------------------- |
0b28002f | 249 | Common ACPI processor functions |
02df8b93 VP |
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 | 330 | if (!entry) |
a6fc6720 | 331 | return_VALUE(-EIO); |
1da177e4 LT |
332 | else { |
333 | entry->proc_fops = &acpi_processor_info_fops; | |
334 | entry->data = acpi_driver_data(device); | |
335 | entry->owner = THIS_MODULE; | |
336 | } | |
337 | ||
338 | /* 'throttling' [R/W] */ | |
339 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, | |
4be44fcd LB |
340 | S_IFREG | S_IRUGO | S_IWUSR, |
341 | acpi_device_dir(device)); | |
1da177e4 | 342 | if (!entry) |
a6fc6720 | 343 | return_VALUE(-EIO); |
1da177e4 LT |
344 | else { |
345 | entry->proc_fops = &acpi_processor_throttling_fops; | |
1da177e4 LT |
346 | entry->data = acpi_driver_data(device); |
347 | entry->owner = THIS_MODULE; | |
348 | } | |
349 | ||
350 | /* 'limit' [R/W] */ | |
351 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
4be44fcd LB |
352 | S_IFREG | S_IRUGO | S_IWUSR, |
353 | acpi_device_dir(device)); | |
1da177e4 | 354 | if (!entry) |
a6fc6720 | 355 | return_VALUE( -EIO); |
1da177e4 LT |
356 | else { |
357 | entry->proc_fops = &acpi_processor_limit_fops; | |
1da177e4 LT |
358 | entry->data = acpi_driver_data(device); |
359 | entry->owner = THIS_MODULE; | |
360 | } | |
361 | ||
362 | return_VALUE(0); | |
363 | } | |
364 | ||
4be44fcd | 365 | static int acpi_processor_remove_fs(struct acpi_device *device) |
1da177e4 LT |
366 | { |
367 | ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); | |
368 | ||
369 | if (acpi_device_dir(device)) { | |
4be44fcd LB |
370 | remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, |
371 | acpi_device_dir(device)); | |
1da177e4 | 372 | remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, |
4be44fcd LB |
373 | acpi_device_dir(device)); |
374 | remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
375 | acpi_device_dir(device)); | |
1da177e4 LT |
376 | remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); |
377 | acpi_device_dir(device) = NULL; | |
378 | } | |
379 | ||
380 | return_VALUE(0); | |
381 | } | |
382 | ||
383 | /* Use the acpiid in MADT to map cpus in case of SMP */ | |
384 | #ifndef CONFIG_SMP | |
df42baa0 | 385 | #define convert_acpiid_to_cpu(acpi_id) (-1) |
1da177e4 LT |
386 | #else |
387 | ||
388 | #ifdef CONFIG_IA64 | |
389 | #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid | |
390 | #define arch_cpu_to_apicid ia64_cpu_to_sapicid | |
391 | #define ARCH_BAD_APICID (0xffff) | |
392 | #else | |
393 | #define arch_acpiid_to_apicid x86_acpiid_to_apicid | |
394 | #define arch_cpu_to_apicid x86_cpu_to_apicid | |
395 | #define ARCH_BAD_APICID (0xff) | |
396 | #endif | |
397 | ||
df42baa0 | 398 | static int convert_acpiid_to_cpu(u8 acpi_id) |
1da177e4 LT |
399 | { |
400 | u16 apic_id; | |
4a35a46b | 401 | int i; |
1da177e4 LT |
402 | |
403 | apic_id = arch_acpiid_to_apicid[acpi_id]; | |
404 | if (apic_id == ARCH_BAD_APICID) | |
405 | return -1; | |
406 | ||
407 | for (i = 0; i < NR_CPUS; i++) { | |
4a35a46b LB |
408 | if (arch_cpu_to_apicid[i] == apic_id) |
409 | return i; | |
1da177e4 LT |
410 | } |
411 | return -1; | |
412 | } | |
413 | #endif | |
414 | ||
415 | /* -------------------------------------------------------------------------- | |
416 | Driver Interface | |
417 | -------------------------------------------------------------------------- */ | |
418 | ||
4be44fcd | 419 | static int acpi_processor_get_info(struct acpi_processor *pr) |
1da177e4 | 420 | { |
4be44fcd LB |
421 | acpi_status status = 0; |
422 | union acpi_object object = { 0 }; | |
423 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
df42baa0 | 424 | int cpu_index; |
4be44fcd | 425 | static int cpu0_initialized; |
1da177e4 LT |
426 | |
427 | ACPI_FUNCTION_TRACE("acpi_processor_get_info"); | |
428 | ||
429 | if (!pr) | |
430 | return_VALUE(-EINVAL); | |
431 | ||
432 | if (num_online_cpus() > 1) | |
433 | errata.smp = TRUE; | |
434 | ||
435 | acpi_processor_errata(pr); | |
436 | ||
437 | /* | |
438 | * Check to see if we have bus mastering arbitration control. This | |
439 | * is required for proper C3 usage (to maintain cache coherency). | |
440 | */ | |
441 | if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { | |
442 | pr->flags.bm_control = 1; | |
443 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
444 | "Bus mastering arbitration control present\n")); |
445 | } else | |
1da177e4 | 446 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 447 | "No bus mastering arbitration control\n")); |
1da177e4 LT |
448 | |
449 | /* | |
450 | * Evalute the processor object. Note that it is common on SMP to | |
451 | * have the first (boot) processor with a valid PBLK address while | |
452 | * all others have a NULL address. | |
453 | */ | |
454 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
455 | if (ACPI_FAILURE(status)) { | |
6468463a | 456 | printk(KERN_ERR PREFIX "Evaluating processor object\n"); |
1da177e4 LT |
457 | return_VALUE(-ENODEV); |
458 | } | |
459 | ||
460 | /* | |
461 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. | |
4be44fcd | 462 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c |
1da177e4 LT |
463 | */ |
464 | pr->acpi_id = object.processor.proc_id; | |
465 | ||
4a35a46b | 466 | cpu_index = convert_acpiid_to_cpu(pr->acpi_id); |
1da177e4 | 467 | |
4be44fcd | 468 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
df42baa0 | 469 | if (!cpu0_initialized && (cpu_index == -1) && |
4be44fcd LB |
470 | (num_online_cpus() == 1)) { |
471 | cpu_index = 0; | |
472 | } | |
473 | ||
474 | cpu0_initialized = 1; | |
475 | ||
476 | pr->id = cpu_index; | |
477 | ||
478 | /* | |
479 | * Extra Processor objects may be enumerated on MP systems with | |
480 | * less than the max # of CPUs. They should be ignored _iff | |
481 | * they are physically not present. | |
482 | */ | |
df42baa0 | 483 | if (cpu_index == -1) { |
4be44fcd LB |
484 | if (ACPI_FAILURE |
485 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { | |
6468463a LB |
486 | printk(KERN_ERR PREFIX |
487 | "Getting cpuindex for acpiid 0x%x\n", | |
488 | pr->acpi_id); | |
4be44fcd LB |
489 | return_VALUE(-ENODEV); |
490 | } | |
491 | } | |
1da177e4 LT |
492 | |
493 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, | |
4be44fcd | 494 | pr->acpi_id)); |
1da177e4 LT |
495 | |
496 | if (!object.processor.pblk_address) | |
497 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
498 | else if (object.processor.pblk_length != 6) | |
6468463a LB |
499 | printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", |
500 | object.processor.pblk_length); | |
1da177e4 LT |
501 | else { |
502 | pr->throttling.address = object.processor.pblk_address; | |
503 | pr->throttling.duty_offset = acpi_fadt.duty_offset; | |
504 | pr->throttling.duty_width = acpi_fadt.duty_width; | |
505 | ||
506 | pr->pblk = object.processor.pblk_address; | |
507 | ||
508 | /* | |
509 | * We don't care about error returns - we just try to mark | |
510 | * these reserved so that nobody else is confused into thinking | |
511 | * that this region might be unused.. | |
512 | * | |
513 | * (In particular, allocating the IO range for Cardbus) | |
514 | */ | |
515 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
516 | } | |
517 | ||
518 | #ifdef CONFIG_CPU_FREQ | |
519 | acpi_processor_ppc_has_changed(pr); | |
520 | #endif | |
521 | acpi_processor_get_throttling_info(pr); | |
522 | acpi_processor_get_limit_info(pr); | |
523 | ||
524 | return_VALUE(0); | |
525 | } | |
526 | ||
cd8e2b48 VP |
527 | static void *processor_device_array[NR_CPUS]; |
528 | ||
4be44fcd | 529 | static int acpi_processor_start(struct acpi_device *device) |
1da177e4 | 530 | { |
4be44fcd LB |
531 | int result = 0; |
532 | acpi_status status = AE_OK; | |
533 | struct acpi_processor *pr; | |
1da177e4 LT |
534 | |
535 | ACPI_FUNCTION_TRACE("acpi_processor_start"); | |
536 | ||
537 | pr = acpi_driver_data(device); | |
538 | ||
539 | result = acpi_processor_get_info(pr); | |
540 | if (result) { | |
541 | /* Processor is physically not present */ | |
542 | return_VALUE(0); | |
543 | } | |
544 | ||
545 | BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); | |
546 | ||
cd8e2b48 VP |
547 | /* |
548 | * Buggy BIOS check | |
549 | * ACPI id of processors can be reported wrongly by the BIOS. | |
550 | * Don't trust it blindly | |
551 | */ | |
552 | if (processor_device_array[pr->id] != NULL && | |
553 | processor_device_array[pr->id] != (void *)device) { | |
0eacee58 LB |
554 | printk(KERN_WARNING "BIOS reported wrong ACPI id" |
555 | "for the processor\n"); | |
cd8e2b48 VP |
556 | return_VALUE(-ENODEV); |
557 | } | |
558 | processor_device_array[pr->id] = (void *)device; | |
559 | ||
1da177e4 LT |
560 | processors[pr->id] = pr; |
561 | ||
562 | result = acpi_processor_add_fs(device); | |
563 | if (result) | |
564 | goto end; | |
565 | ||
566 | status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 567 | acpi_processor_notify, pr); |
1da177e4 | 568 | |
05131ecc VP |
569 | /* _PDC call should be done before doing anything else (if reqd.). */ |
570 | arch_acpi_processor_init_pdc(pr); | |
571 | acpi_processor_set_pdc(pr); | |
572 | ||
1da177e4 LT |
573 | acpi_processor_power_init(pr, device); |
574 | ||
575 | if (pr->flags.throttling) { | |
576 | printk(KERN_INFO PREFIX "%s [%s] (supports", | |
4be44fcd | 577 | acpi_device_name(device), acpi_device_bid(device)); |
1da177e4 LT |
578 | printk(" %d throttling states", pr->throttling.state_count); |
579 | printk(")\n"); | |
580 | } | |
581 | ||
4be44fcd | 582 | end: |
1da177e4 LT |
583 | |
584 | return_VALUE(result); | |
585 | } | |
586 | ||
4be44fcd | 587 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 588 | { |
4be44fcd LB |
589 | struct acpi_processor *pr = (struct acpi_processor *)data; |
590 | struct acpi_device *device = NULL; | |
1da177e4 LT |
591 | |
592 | ACPI_FUNCTION_TRACE("acpi_processor_notify"); | |
593 | ||
594 | if (!pr) | |
595 | return_VOID; | |
596 | ||
597 | if (acpi_bus_get_device(pr->handle, &device)) | |
598 | return_VOID; | |
599 | ||
600 | switch (event) { | |
601 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
602 | acpi_processor_ppc_has_changed(pr); | |
603 | acpi_bus_generate_event(device, event, | |
4be44fcd | 604 | pr->performance_platform_limit); |
1da177e4 LT |
605 | break; |
606 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
607 | acpi_processor_cst_has_changed(pr); | |
608 | acpi_bus_generate_event(device, event, 0); | |
609 | break; | |
610 | default: | |
611 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 612 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
613 | break; |
614 | } | |
615 | ||
616 | return_VOID; | |
617 | } | |
618 | ||
4be44fcd | 619 | static int acpi_processor_add(struct acpi_device *device) |
1da177e4 | 620 | { |
4be44fcd | 621 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
622 | |
623 | ACPI_FUNCTION_TRACE("acpi_processor_add"); | |
624 | ||
625 | if (!device) | |
626 | return_VALUE(-EINVAL); | |
627 | ||
628 | pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
629 | if (!pr) | |
630 | return_VALUE(-ENOMEM); | |
631 | memset(pr, 0, sizeof(struct acpi_processor)); | |
632 | ||
633 | pr->handle = device->handle; | |
634 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
635 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
636 | acpi_driver_data(device) = pr; | |
637 | ||
638 | return_VALUE(0); | |
639 | } | |
640 | ||
4be44fcd | 641 | static int acpi_processor_remove(struct acpi_device *device, int type) |
1da177e4 | 642 | { |
4be44fcd LB |
643 | acpi_status status = AE_OK; |
644 | struct acpi_processor *pr = NULL; | |
1da177e4 LT |
645 | |
646 | ACPI_FUNCTION_TRACE("acpi_processor_remove"); | |
647 | ||
648 | if (!device || !acpi_driver_data(device)) | |
649 | return_VALUE(-EINVAL); | |
650 | ||
4be44fcd | 651 | pr = (struct acpi_processor *)acpi_driver_data(device); |
1da177e4 LT |
652 | |
653 | if (pr->id >= NR_CPUS) { | |
654 | kfree(pr); | |
655 | return_VALUE(0); | |
656 | } | |
657 | ||
658 | if (type == ACPI_BUS_REMOVAL_EJECT) { | |
659 | if (acpi_processor_handle_eject(pr)) | |
660 | return_VALUE(-EINVAL); | |
661 | } | |
662 | ||
663 | acpi_processor_power_exit(pr, device); | |
664 | ||
665 | status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 666 | acpi_processor_notify); |
1da177e4 LT |
667 | |
668 | acpi_processor_remove_fs(device); | |
669 | ||
670 | processors[pr->id] = NULL; | |
671 | ||
672 | kfree(pr); | |
673 | ||
674 | return_VALUE(0); | |
675 | } | |
676 | ||
677 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
678 | /**************************************************************************** | |
679 | * Acpi processor hotplug support * | |
680 | ****************************************************************************/ | |
681 | ||
682 | static int is_processor_present(acpi_handle handle); | |
683 | ||
4be44fcd | 684 | static int is_processor_present(acpi_handle handle) |
1da177e4 | 685 | { |
4be44fcd LB |
686 | acpi_status status; |
687 | unsigned long sta = 0; | |
1da177e4 LT |
688 | |
689 | ACPI_FUNCTION_TRACE("is_processor_present"); | |
690 | ||
691 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
692 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { | |
a6fc6720 | 693 | ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); |
1da177e4 LT |
694 | return_VALUE(0); |
695 | } | |
696 | return_VALUE(1); | |
697 | } | |
698 | ||
1da177e4 | 699 | static |
4be44fcd | 700 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
1da177e4 | 701 | { |
4be44fcd LB |
702 | acpi_handle phandle; |
703 | struct acpi_device *pdev; | |
704 | struct acpi_processor *pr; | |
1da177e4 LT |
705 | |
706 | ACPI_FUNCTION_TRACE("acpi_processor_device_add"); | |
707 | ||
708 | if (acpi_get_parent(handle, &phandle)) { | |
709 | return_VALUE(-ENODEV); | |
710 | } | |
711 | ||
712 | if (acpi_bus_get_device(phandle, &pdev)) { | |
713 | return_VALUE(-ENODEV); | |
714 | } | |
715 | ||
716 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { | |
717 | return_VALUE(-ENODEV); | |
718 | } | |
719 | ||
3fb02738 | 720 | acpi_bus_start(*device); |
1da177e4 LT |
721 | |
722 | pr = acpi_driver_data(*device); | |
723 | if (!pr) | |
724 | return_VALUE(-ENODEV); | |
725 | ||
4be44fcd | 726 | if ((pr->id >= 0) && (pr->id < NR_CPUS)) { |
312c004d | 727 | kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); |
1da177e4 LT |
728 | } |
729 | return_VALUE(0); | |
730 | } | |
731 | ||
1da177e4 | 732 | static void |
4be44fcd | 733 | acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 734 | { |
4be44fcd LB |
735 | struct acpi_processor *pr; |
736 | struct acpi_device *device = NULL; | |
1da177e4 LT |
737 | int result; |
738 | ||
739 | ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); | |
740 | ||
741 | switch (event) { | |
742 | case ACPI_NOTIFY_BUS_CHECK: | |
743 | case ACPI_NOTIFY_DEVICE_CHECK: | |
744 | printk("Processor driver received %s event\n", | |
4be44fcd LB |
745 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
746 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
747 | |
748 | if (!is_processor_present(handle)) | |
749 | break; | |
750 | ||
751 | if (acpi_bus_get_device(handle, &device)) { | |
752 | result = acpi_processor_device_add(handle, &device); | |
753 | if (result) | |
6468463a LB |
754 | printk(KERN_ERR PREFIX |
755 | "Unable to add the device\n"); | |
1da177e4 LT |
756 | break; |
757 | } | |
758 | ||
759 | pr = acpi_driver_data(device); | |
760 | if (!pr) { | |
6468463a | 761 | printk(KERN_ERR PREFIX "Driver data is NULL\n"); |
1da177e4 LT |
762 | break; |
763 | } | |
764 | ||
765 | if (pr->id >= 0 && (pr->id < NR_CPUS)) { | |
312c004d | 766 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
767 | break; |
768 | } | |
769 | ||
770 | result = acpi_processor_start(device); | |
4be44fcd | 771 | if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { |
312c004d | 772 | kobject_uevent(&device->kobj, KOBJ_ONLINE); |
1da177e4 | 773 | } else { |
6468463a LB |
774 | printk(KERN_ERR PREFIX "Device [%s] failed to start\n", |
775 | acpi_device_bid(device)); | |
1da177e4 | 776 | } |
4be44fcd | 777 | break; |
1da177e4 | 778 | case ACPI_NOTIFY_EJECT_REQUEST: |
4be44fcd LB |
779 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
780 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); | |
1da177e4 LT |
781 | |
782 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a LB |
783 | printk(KERN_ERR PREFIX |
784 | "Device don't exist, dropping EJECT\n"); | |
1da177e4 LT |
785 | break; |
786 | } | |
787 | pr = acpi_driver_data(device); | |
788 | if (!pr) { | |
6468463a LB |
789 | printk(KERN_ERR PREFIX |
790 | "Driver data is NULL, dropping EJECT\n"); | |
1da177e4 LT |
791 | return_VOID; |
792 | } | |
793 | ||
794 | if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) | |
312c004d | 795 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
796 | break; |
797 | default: | |
798 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 799 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
800 | break; |
801 | } | |
802 | ||
803 | return_VOID; | |
804 | } | |
805 | ||
806 | static acpi_status | |
807 | processor_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 808 | u32 lvl, void *context, void **rv) |
1da177e4 | 809 | { |
4be44fcd | 810 | acpi_status status; |
1da177e4 | 811 | int *action = context; |
4be44fcd | 812 | acpi_object_type type = 0; |
1da177e4 LT |
813 | |
814 | status = acpi_get_type(handle, &type); | |
815 | if (ACPI_FAILURE(status)) | |
4be44fcd | 816 | return (AE_OK); |
1da177e4 LT |
817 | |
818 | if (type != ACPI_TYPE_PROCESSOR) | |
4be44fcd | 819 | return (AE_OK); |
1da177e4 | 820 | |
4be44fcd | 821 | switch (*action) { |
1da177e4 LT |
822 | case INSTALL_NOTIFY_HANDLER: |
823 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
824 | ACPI_SYSTEM_NOTIFY, |
825 | acpi_processor_hotplug_notify, | |
826 | NULL); | |
1da177e4 LT |
827 | break; |
828 | case UNINSTALL_NOTIFY_HANDLER: | |
829 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
830 | ACPI_SYSTEM_NOTIFY, |
831 | acpi_processor_hotplug_notify); | |
1da177e4 LT |
832 | break; |
833 | default: | |
834 | break; | |
835 | } | |
836 | ||
4be44fcd | 837 | return (AE_OK); |
1da177e4 LT |
838 | } |
839 | ||
4be44fcd | 840 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
841 | { |
842 | ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); | |
843 | ||
844 | if (!is_processor_present(handle)) { | |
845 | return_VALUE(AE_ERROR); | |
846 | } | |
847 | ||
848 | if (acpi_map_lsapic(handle, p_cpu)) | |
849 | return_VALUE(AE_ERROR); | |
850 | ||
851 | if (arch_register_cpu(*p_cpu)) { | |
852 | acpi_unmap_lsapic(*p_cpu); | |
853 | return_VALUE(AE_ERROR); | |
854 | } | |
855 | ||
856 | return_VALUE(AE_OK); | |
857 | } | |
858 | ||
4be44fcd | 859 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 LT |
860 | { |
861 | if (cpu_online(pr->id)) { | |
4be44fcd | 862 | return (-EINVAL); |
1da177e4 LT |
863 | } |
864 | arch_unregister_cpu(pr->id); | |
865 | acpi_unmap_lsapic(pr->id); | |
4be44fcd | 866 | return (0); |
1da177e4 LT |
867 | } |
868 | #else | |
4be44fcd | 869 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
870 | { |
871 | return AE_ERROR; | |
872 | } | |
4be44fcd | 873 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 874 | { |
4be44fcd | 875 | return (-EINVAL); |
1da177e4 LT |
876 | } |
877 | #endif | |
878 | ||
1da177e4 LT |
879 | static |
880 | void acpi_processor_install_hotplug_notify(void) | |
881 | { | |
882 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
883 | int action = INSTALL_NOTIFY_HANDLER; | |
884 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
885 | ACPI_ROOT_OBJECT, |
886 | ACPI_UINT32_MAX, | |
887 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
888 | #endif |
889 | } | |
890 | ||
1da177e4 LT |
891 | static |
892 | void acpi_processor_uninstall_hotplug_notify(void) | |
893 | { | |
894 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
895 | int action = UNINSTALL_NOTIFY_HANDLER; | |
896 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
897 | ACPI_ROOT_OBJECT, |
898 | ACPI_UINT32_MAX, | |
899 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
900 | #endif |
901 | } | |
902 | ||
903 | /* | |
904 | * We keep the driver loaded even when ACPI is not running. | |
905 | * This is needed for the powernow-k8 driver, that works even without | |
906 | * ACPI, but needs symbols from this driver | |
907 | */ | |
908 | ||
4be44fcd | 909 | static int __init acpi_processor_init(void) |
1da177e4 | 910 | { |
4be44fcd | 911 | int result = 0; |
1da177e4 LT |
912 | |
913 | ACPI_FUNCTION_TRACE("acpi_processor_init"); | |
914 | ||
915 | memset(&processors, 0, sizeof(processors)); | |
916 | memset(&errata, 0, sizeof(errata)); | |
917 | ||
918 | acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
919 | if (!acpi_processor_dir) | |
920 | return_VALUE(0); | |
921 | acpi_processor_dir->owner = THIS_MODULE; | |
922 | ||
923 | result = acpi_bus_register_driver(&acpi_processor_driver); | |
924 | if (result < 0) { | |
925 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
926 | return_VALUE(0); | |
927 | } | |
928 | ||
929 | acpi_processor_install_hotplug_notify(); | |
930 | ||
931 | acpi_thermal_cpufreq_init(); | |
932 | ||
933 | acpi_processor_ppc_init(); | |
934 | ||
935 | return_VALUE(0); | |
936 | } | |
937 | ||
4be44fcd | 938 | static void __exit acpi_processor_exit(void) |
1da177e4 LT |
939 | { |
940 | ACPI_FUNCTION_TRACE("acpi_processor_exit"); | |
941 | ||
942 | acpi_processor_ppc_exit(); | |
943 | ||
944 | acpi_thermal_cpufreq_exit(); | |
945 | ||
946 | acpi_processor_uninstall_hotplug_notify(); | |
947 | ||
948 | acpi_bus_unregister_driver(&acpi_processor_driver); | |
949 | ||
950 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
951 | ||
952 | return_VOID; | |
953 | } | |
954 | ||
1da177e4 LT |
955 | module_init(acpi_processor_init); |
956 | module_exit(acpi_processor_exit); | |
957 | ||
958 | EXPORT_SYMBOL(acpi_processor_set_thermal_limit); | |
959 | ||
960 | MODULE_ALIAS("processor"); |