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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 | */ | |
256 | ||
257 | int acpi_processor_set_pdc(struct acpi_processor *pr, | |
4be44fcd | 258 | struct acpi_object_list *pdc_in) |
02df8b93 | 259 | { |
4be44fcd LB |
260 | acpi_status status = AE_OK; |
261 | u32 arg0_buf[3]; | |
262 | union acpi_object arg0 = { ACPI_TYPE_BUFFER }; | |
263 | struct acpi_object_list no_object = { 1, &arg0 }; | |
264 | struct acpi_object_list *pdc; | |
02df8b93 VP |
265 | |
266 | ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); | |
267 | ||
268 | arg0.buffer.length = 12; | |
269 | arg0.buffer.pointer = (u8 *) arg0_buf; | |
270 | arg0_buf[0] = ACPI_PDC_REVISION_ID; | |
271 | arg0_buf[1] = 0; | |
272 | arg0_buf[2] = 0; | |
273 | ||
274 | pdc = (pdc_in) ? pdc_in : &no_object; | |
275 | ||
276 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); | |
277 | ||
278 | if ((ACPI_FAILURE(status)) && (pdc_in)) | |
4be44fcd LB |
279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
280 | "Error evaluating _PDC, using legacy perf. control...\n")); | |
02df8b93 VP |
281 | |
282 | return_VALUE(status); | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /* -------------------------------------------------------------------------- |
286 | FS Interface (/proc) | |
287 | -------------------------------------------------------------------------- */ | |
288 | ||
4be44fcd | 289 | static struct proc_dir_entry *acpi_processor_dir = NULL; |
1da177e4 LT |
290 | |
291 | static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) | |
292 | { | |
4be44fcd | 293 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
1da177e4 LT |
294 | |
295 | ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); | |
296 | ||
297 | if (!pr) | |
298 | goto end; | |
299 | ||
300 | seq_printf(seq, "processor id: %d\n" | |
4be44fcd LB |
301 | "acpi id: %d\n" |
302 | "bus mastering control: %s\n" | |
303 | "power management: %s\n" | |
304 | "throttling control: %s\n" | |
305 | "limit interface: %s\n", | |
306 | pr->id, | |
307 | pr->acpi_id, | |
308 | pr->flags.bm_control ? "yes" : "no", | |
309 | pr->flags.power ? "yes" : "no", | |
310 | pr->flags.throttling ? "yes" : "no", | |
311 | pr->flags.limit ? "yes" : "no"); | |
312 | ||
313 | end: | |
1da177e4 LT |
314 | return_VALUE(0); |
315 | } | |
316 | ||
317 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) | |
318 | { | |
319 | return single_open(file, acpi_processor_info_seq_show, | |
4be44fcd | 320 | PDE(inode)->data); |
1da177e4 LT |
321 | } |
322 | ||
4be44fcd | 323 | static int acpi_processor_add_fs(struct acpi_device *device) |
1da177e4 | 324 | { |
4be44fcd | 325 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
326 | |
327 | ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); | |
328 | ||
329 | if (!acpi_device_dir(device)) { | |
330 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 331 | acpi_processor_dir); |
1da177e4 LT |
332 | if (!acpi_device_dir(device)) |
333 | return_VALUE(-ENODEV); | |
334 | } | |
335 | acpi_device_dir(device)->owner = THIS_MODULE; | |
336 | ||
337 | /* 'info' [R] */ | |
338 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, | |
4be44fcd | 339 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
340 | if (!entry) |
341 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
342 | "Unable to create '%s' fs entry\n", |
343 | ACPI_PROCESSOR_FILE_INFO)); | |
1da177e4 LT |
344 | else { |
345 | entry->proc_fops = &acpi_processor_info_fops; | |
346 | entry->data = acpi_driver_data(device); | |
347 | entry->owner = THIS_MODULE; | |
348 | } | |
349 | ||
350 | /* 'throttling' [R/W] */ | |
351 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, | |
4be44fcd LB |
352 | S_IFREG | S_IRUGO | S_IWUSR, |
353 | acpi_device_dir(device)); | |
1da177e4 LT |
354 | if (!entry) |
355 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
356 | "Unable to create '%s' fs entry\n", |
357 | ACPI_PROCESSOR_FILE_THROTTLING)); | |
1da177e4 LT |
358 | else { |
359 | entry->proc_fops = &acpi_processor_throttling_fops; | |
360 | entry->proc_fops->write = acpi_processor_write_throttling; | |
361 | entry->data = acpi_driver_data(device); | |
362 | entry->owner = THIS_MODULE; | |
363 | } | |
364 | ||
365 | /* 'limit' [R/W] */ | |
366 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
4be44fcd LB |
367 | S_IFREG | S_IRUGO | S_IWUSR, |
368 | acpi_device_dir(device)); | |
1da177e4 LT |
369 | if (!entry) |
370 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
371 | "Unable to create '%s' fs entry\n", |
372 | ACPI_PROCESSOR_FILE_LIMIT)); | |
1da177e4 LT |
373 | else { |
374 | entry->proc_fops = &acpi_processor_limit_fops; | |
375 | entry->proc_fops->write = acpi_processor_write_limit; | |
376 | entry->data = acpi_driver_data(device); | |
377 | entry->owner = THIS_MODULE; | |
378 | } | |
379 | ||
380 | return_VALUE(0); | |
381 | } | |
382 | ||
4be44fcd | 383 | static int acpi_processor_remove_fs(struct acpi_device *device) |
1da177e4 LT |
384 | { |
385 | ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); | |
386 | ||
387 | if (acpi_device_dir(device)) { | |
4be44fcd LB |
388 | remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, |
389 | acpi_device_dir(device)); | |
1da177e4 | 390 | remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, |
4be44fcd LB |
391 | acpi_device_dir(device)); |
392 | remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
393 | acpi_device_dir(device)); | |
1da177e4 LT |
394 | remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); |
395 | acpi_device_dir(device) = NULL; | |
396 | } | |
397 | ||
398 | return_VALUE(0); | |
399 | } | |
400 | ||
401 | /* Use the acpiid in MADT to map cpus in case of SMP */ | |
402 | #ifndef CONFIG_SMP | |
4a35a46b | 403 | #define convert_acpiid_to_cpu(acpi_id) (0xff) |
1da177e4 LT |
404 | #else |
405 | ||
406 | #ifdef CONFIG_IA64 | |
407 | #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid | |
408 | #define arch_cpu_to_apicid ia64_cpu_to_sapicid | |
409 | #define ARCH_BAD_APICID (0xffff) | |
410 | #else | |
411 | #define arch_acpiid_to_apicid x86_acpiid_to_apicid | |
412 | #define arch_cpu_to_apicid x86_cpu_to_apicid | |
413 | #define ARCH_BAD_APICID (0xff) | |
414 | #endif | |
415 | ||
4a35a46b | 416 | static u8 convert_acpiid_to_cpu(u8 acpi_id) |
1da177e4 LT |
417 | { |
418 | u16 apic_id; | |
4a35a46b | 419 | int i; |
1da177e4 LT |
420 | |
421 | apic_id = arch_acpiid_to_apicid[acpi_id]; | |
422 | if (apic_id == ARCH_BAD_APICID) | |
423 | return -1; | |
424 | ||
425 | for (i = 0; i < NR_CPUS; i++) { | |
4a35a46b LB |
426 | if (arch_cpu_to_apicid[i] == apic_id) |
427 | return i; | |
1da177e4 LT |
428 | } |
429 | return -1; | |
430 | } | |
431 | #endif | |
432 | ||
433 | /* -------------------------------------------------------------------------- | |
434 | Driver Interface | |
435 | -------------------------------------------------------------------------- */ | |
436 | ||
4be44fcd | 437 | static int acpi_processor_get_info(struct acpi_processor *pr) |
1da177e4 | 438 | { |
4be44fcd LB |
439 | acpi_status status = 0; |
440 | union acpi_object object = { 0 }; | |
441 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
4a35a46b | 442 | u8 cpu_index; |
4be44fcd | 443 | static int cpu0_initialized; |
1da177e4 LT |
444 | |
445 | ACPI_FUNCTION_TRACE("acpi_processor_get_info"); | |
446 | ||
447 | if (!pr) | |
448 | return_VALUE(-EINVAL); | |
449 | ||
450 | if (num_online_cpus() > 1) | |
451 | errata.smp = TRUE; | |
452 | ||
453 | acpi_processor_errata(pr); | |
454 | ||
455 | /* | |
456 | * Check to see if we have bus mastering arbitration control. This | |
457 | * is required for proper C3 usage (to maintain cache coherency). | |
458 | */ | |
459 | if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { | |
460 | pr->flags.bm_control = 1; | |
461 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
462 | "Bus mastering arbitration control present\n")); |
463 | } else | |
1da177e4 | 464 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 465 | "No bus mastering arbitration control\n")); |
1da177e4 LT |
466 | |
467 | /* | |
468 | * Evalute the processor object. Note that it is common on SMP to | |
469 | * have the first (boot) processor with a valid PBLK address while | |
470 | * all others have a NULL address. | |
471 | */ | |
472 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
473 | if (ACPI_FAILURE(status)) { | |
474 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 475 | "Error evaluating processor object\n")); |
1da177e4 LT |
476 | return_VALUE(-ENODEV); |
477 | } | |
478 | ||
479 | /* | |
480 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. | |
4be44fcd | 481 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c |
1da177e4 LT |
482 | */ |
483 | pr->acpi_id = object.processor.proc_id; | |
484 | ||
4a35a46b | 485 | cpu_index = convert_acpiid_to_cpu(pr->acpi_id); |
1da177e4 | 486 | |
4be44fcd | 487 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
4a35a46b | 488 | if (!cpu0_initialized && (cpu_index == 0xff) && |
4be44fcd LB |
489 | (num_online_cpus() == 1)) { |
490 | cpu_index = 0; | |
491 | } | |
492 | ||
493 | cpu0_initialized = 1; | |
494 | ||
495 | pr->id = cpu_index; | |
496 | ||
497 | /* | |
498 | * Extra Processor objects may be enumerated on MP systems with | |
499 | * less than the max # of CPUs. They should be ignored _iff | |
500 | * they are physically not present. | |
501 | */ | |
4a35a46b | 502 | if (cpu_index >= NR_CPUS) { |
4be44fcd LB |
503 | if (ACPI_FAILURE |
504 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { | |
4a35a46b | 505 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
4be44fcd LB |
506 | "Error getting cpuindex for acpiid 0x%x\n", |
507 | pr->acpi_id)); | |
508 | return_VALUE(-ENODEV); | |
509 | } | |
510 | } | |
1da177e4 LT |
511 | |
512 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, | |
4be44fcd | 513 | pr->acpi_id)); |
1da177e4 LT |
514 | |
515 | if (!object.processor.pblk_address) | |
516 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
517 | else if (object.processor.pblk_length != 6) | |
518 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n", | |
4be44fcd | 519 | object.processor.pblk_length)); |
1da177e4 LT |
520 | else { |
521 | pr->throttling.address = object.processor.pblk_address; | |
522 | pr->throttling.duty_offset = acpi_fadt.duty_offset; | |
523 | pr->throttling.duty_width = acpi_fadt.duty_width; | |
524 | ||
525 | pr->pblk = object.processor.pblk_address; | |
526 | ||
527 | /* | |
528 | * We don't care about error returns - we just try to mark | |
529 | * these reserved so that nobody else is confused into thinking | |
530 | * that this region might be unused.. | |
531 | * | |
532 | * (In particular, allocating the IO range for Cardbus) | |
533 | */ | |
534 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
535 | } | |
536 | ||
537 | #ifdef CONFIG_CPU_FREQ | |
538 | acpi_processor_ppc_has_changed(pr); | |
539 | #endif | |
540 | acpi_processor_get_throttling_info(pr); | |
541 | acpi_processor_get_limit_info(pr); | |
542 | ||
543 | return_VALUE(0); | |
544 | } | |
545 | ||
cd8e2b48 VP |
546 | static void *processor_device_array[NR_CPUS]; |
547 | ||
4be44fcd | 548 | static int acpi_processor_start(struct acpi_device *device) |
1da177e4 | 549 | { |
4be44fcd LB |
550 | int result = 0; |
551 | acpi_status status = AE_OK; | |
552 | struct acpi_processor *pr; | |
1da177e4 LT |
553 | |
554 | ACPI_FUNCTION_TRACE("acpi_processor_start"); | |
555 | ||
556 | pr = acpi_driver_data(device); | |
557 | ||
558 | result = acpi_processor_get_info(pr); | |
559 | if (result) { | |
560 | /* Processor is physically not present */ | |
561 | return_VALUE(0); | |
562 | } | |
563 | ||
564 | BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); | |
565 | ||
cd8e2b48 VP |
566 | /* |
567 | * Buggy BIOS check | |
568 | * ACPI id of processors can be reported wrongly by the BIOS. | |
569 | * Don't trust it blindly | |
570 | */ | |
571 | if (processor_device_array[pr->id] != NULL && | |
572 | processor_device_array[pr->id] != (void *)device) { | |
573 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id" | |
574 | "for the processor\n")); | |
575 | return_VALUE(-ENODEV); | |
576 | } | |
577 | processor_device_array[pr->id] = (void *)device; | |
578 | ||
1da177e4 LT |
579 | processors[pr->id] = pr; |
580 | ||
581 | result = acpi_processor_add_fs(device); | |
582 | if (result) | |
583 | goto end; | |
584 | ||
585 | status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 586 | acpi_processor_notify, pr); |
1da177e4 LT |
587 | if (ACPI_FAILURE(status)) { |
588 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 589 | "Error installing device notify handler\n")); |
1da177e4 LT |
590 | } |
591 | ||
592 | acpi_processor_power_init(pr, device); | |
593 | ||
594 | if (pr->flags.throttling) { | |
595 | printk(KERN_INFO PREFIX "%s [%s] (supports", | |
4be44fcd | 596 | acpi_device_name(device), acpi_device_bid(device)); |
1da177e4 LT |
597 | printk(" %d throttling states", pr->throttling.state_count); |
598 | printk(")\n"); | |
599 | } | |
600 | ||
4be44fcd | 601 | end: |
1da177e4 LT |
602 | |
603 | return_VALUE(result); | |
604 | } | |
605 | ||
4be44fcd | 606 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 607 | { |
4be44fcd LB |
608 | struct acpi_processor *pr = (struct acpi_processor *)data; |
609 | struct acpi_device *device = NULL; | |
1da177e4 LT |
610 | |
611 | ACPI_FUNCTION_TRACE("acpi_processor_notify"); | |
612 | ||
613 | if (!pr) | |
614 | return_VOID; | |
615 | ||
616 | if (acpi_bus_get_device(pr->handle, &device)) | |
617 | return_VOID; | |
618 | ||
619 | switch (event) { | |
620 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
621 | acpi_processor_ppc_has_changed(pr); | |
622 | acpi_bus_generate_event(device, event, | |
4be44fcd | 623 | pr->performance_platform_limit); |
1da177e4 LT |
624 | break; |
625 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
626 | acpi_processor_cst_has_changed(pr); | |
627 | acpi_bus_generate_event(device, event, 0); | |
628 | break; | |
629 | default: | |
630 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 631 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
632 | break; |
633 | } | |
634 | ||
635 | return_VOID; | |
636 | } | |
637 | ||
4be44fcd | 638 | static int acpi_processor_add(struct acpi_device *device) |
1da177e4 | 639 | { |
4be44fcd | 640 | struct acpi_processor *pr = NULL; |
1da177e4 LT |
641 | |
642 | ACPI_FUNCTION_TRACE("acpi_processor_add"); | |
643 | ||
644 | if (!device) | |
645 | return_VALUE(-EINVAL); | |
646 | ||
647 | pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
648 | if (!pr) | |
649 | return_VALUE(-ENOMEM); | |
650 | memset(pr, 0, sizeof(struct acpi_processor)); | |
651 | ||
652 | pr->handle = device->handle; | |
653 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
654 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
655 | acpi_driver_data(device) = pr; | |
656 | ||
657 | return_VALUE(0); | |
658 | } | |
659 | ||
4be44fcd | 660 | static int acpi_processor_remove(struct acpi_device *device, int type) |
1da177e4 | 661 | { |
4be44fcd LB |
662 | acpi_status status = AE_OK; |
663 | struct acpi_processor *pr = NULL; | |
1da177e4 LT |
664 | |
665 | ACPI_FUNCTION_TRACE("acpi_processor_remove"); | |
666 | ||
667 | if (!device || !acpi_driver_data(device)) | |
668 | return_VALUE(-EINVAL); | |
669 | ||
4be44fcd | 670 | pr = (struct acpi_processor *)acpi_driver_data(device); |
1da177e4 LT |
671 | |
672 | if (pr->id >= NR_CPUS) { | |
673 | kfree(pr); | |
674 | return_VALUE(0); | |
675 | } | |
676 | ||
677 | if (type == ACPI_BUS_REMOVAL_EJECT) { | |
678 | if (acpi_processor_handle_eject(pr)) | |
679 | return_VALUE(-EINVAL); | |
680 | } | |
681 | ||
682 | acpi_processor_power_exit(pr, device); | |
683 | ||
684 | status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 685 | acpi_processor_notify); |
1da177e4 LT |
686 | if (ACPI_FAILURE(status)) { |
687 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 688 | "Error removing notify handler\n")); |
1da177e4 LT |
689 | } |
690 | ||
691 | acpi_processor_remove_fs(device); | |
692 | ||
693 | processors[pr->id] = NULL; | |
694 | ||
695 | kfree(pr); | |
696 | ||
697 | return_VALUE(0); | |
698 | } | |
699 | ||
700 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
701 | /**************************************************************************** | |
702 | * Acpi processor hotplug support * | |
703 | ****************************************************************************/ | |
704 | ||
705 | static int is_processor_present(acpi_handle handle); | |
706 | ||
4be44fcd | 707 | static int is_processor_present(acpi_handle handle) |
1da177e4 | 708 | { |
4be44fcd LB |
709 | acpi_status status; |
710 | unsigned long sta = 0; | |
1da177e4 LT |
711 | |
712 | ACPI_FUNCTION_TRACE("is_processor_present"); | |
713 | ||
714 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
715 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { | |
716 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 717 | "Processor Device is not present\n")); |
1da177e4 LT |
718 | return_VALUE(0); |
719 | } | |
720 | return_VALUE(1); | |
721 | } | |
722 | ||
1da177e4 | 723 | static |
4be44fcd | 724 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
1da177e4 | 725 | { |
4be44fcd LB |
726 | acpi_handle phandle; |
727 | struct acpi_device *pdev; | |
728 | struct acpi_processor *pr; | |
1da177e4 LT |
729 | |
730 | ACPI_FUNCTION_TRACE("acpi_processor_device_add"); | |
731 | ||
732 | if (acpi_get_parent(handle, &phandle)) { | |
733 | return_VALUE(-ENODEV); | |
734 | } | |
735 | ||
736 | if (acpi_bus_get_device(phandle, &pdev)) { | |
737 | return_VALUE(-ENODEV); | |
738 | } | |
739 | ||
740 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { | |
741 | return_VALUE(-ENODEV); | |
742 | } | |
743 | ||
3fb02738 | 744 | acpi_bus_start(*device); |
1da177e4 LT |
745 | |
746 | pr = acpi_driver_data(*device); | |
747 | if (!pr) | |
748 | return_VALUE(-ENODEV); | |
749 | ||
4be44fcd | 750 | if ((pr->id >= 0) && (pr->id < NR_CPUS)) { |
312c004d | 751 | kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); |
1da177e4 LT |
752 | } |
753 | return_VALUE(0); | |
754 | } | |
755 | ||
1da177e4 | 756 | static void |
4be44fcd | 757 | acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 758 | { |
4be44fcd LB |
759 | struct acpi_processor *pr; |
760 | struct acpi_device *device = NULL; | |
1da177e4 LT |
761 | int result; |
762 | ||
763 | ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); | |
764 | ||
765 | switch (event) { | |
766 | case ACPI_NOTIFY_BUS_CHECK: | |
767 | case ACPI_NOTIFY_DEVICE_CHECK: | |
768 | printk("Processor driver received %s event\n", | |
4be44fcd LB |
769 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
770 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
771 | |
772 | if (!is_processor_present(handle)) | |
773 | break; | |
774 | ||
775 | if (acpi_bus_get_device(handle, &device)) { | |
776 | result = acpi_processor_device_add(handle, &device); | |
777 | if (result) | |
778 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 779 | "Unable to add the device\n")); |
1da177e4 LT |
780 | break; |
781 | } | |
782 | ||
783 | pr = acpi_driver_data(device); | |
784 | if (!pr) { | |
785 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 786 | "Driver data is NULL\n")); |
1da177e4 LT |
787 | break; |
788 | } | |
789 | ||
790 | if (pr->id >= 0 && (pr->id < NR_CPUS)) { | |
312c004d | 791 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
792 | break; |
793 | } | |
794 | ||
795 | result = acpi_processor_start(device); | |
4be44fcd | 796 | if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { |
312c004d | 797 | kobject_uevent(&device->kobj, KOBJ_ONLINE); |
1da177e4 LT |
798 | } else { |
799 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
800 | "Device [%s] failed to start\n", |
801 | acpi_device_bid(device))); | |
1da177e4 | 802 | } |
4be44fcd | 803 | break; |
1da177e4 | 804 | case ACPI_NOTIFY_EJECT_REQUEST: |
4be44fcd LB |
805 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
806 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); | |
1da177e4 LT |
807 | |
808 | if (acpi_bus_get_device(handle, &device)) { | |
4be44fcd LB |
809 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
810 | "Device don't exist, dropping EJECT\n")); | |
1da177e4 LT |
811 | break; |
812 | } | |
813 | pr = acpi_driver_data(device); | |
814 | if (!pr) { | |
4be44fcd LB |
815 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
816 | "Driver data is NULL, dropping EJECT\n")); | |
1da177e4 LT |
817 | return_VOID; |
818 | } | |
819 | ||
820 | if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) | |
312c004d | 821 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
822 | break; |
823 | default: | |
824 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 825 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
826 | break; |
827 | } | |
828 | ||
829 | return_VOID; | |
830 | } | |
831 | ||
832 | static acpi_status | |
833 | processor_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 834 | u32 lvl, void *context, void **rv) |
1da177e4 | 835 | { |
4be44fcd | 836 | acpi_status status; |
1da177e4 | 837 | int *action = context; |
4be44fcd | 838 | acpi_object_type type = 0; |
1da177e4 LT |
839 | |
840 | status = acpi_get_type(handle, &type); | |
841 | if (ACPI_FAILURE(status)) | |
4be44fcd | 842 | return (AE_OK); |
1da177e4 LT |
843 | |
844 | if (type != ACPI_TYPE_PROCESSOR) | |
4be44fcd | 845 | return (AE_OK); |
1da177e4 | 846 | |
4be44fcd | 847 | switch (*action) { |
1da177e4 LT |
848 | case INSTALL_NOTIFY_HANDLER: |
849 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
850 | ACPI_SYSTEM_NOTIFY, |
851 | acpi_processor_hotplug_notify, | |
852 | NULL); | |
1da177e4 LT |
853 | break; |
854 | case UNINSTALL_NOTIFY_HANDLER: | |
855 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
856 | ACPI_SYSTEM_NOTIFY, |
857 | acpi_processor_hotplug_notify); | |
1da177e4 LT |
858 | break; |
859 | default: | |
860 | break; | |
861 | } | |
862 | ||
4be44fcd | 863 | return (AE_OK); |
1da177e4 LT |
864 | } |
865 | ||
4be44fcd | 866 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
867 | { |
868 | ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); | |
869 | ||
870 | if (!is_processor_present(handle)) { | |
871 | return_VALUE(AE_ERROR); | |
872 | } | |
873 | ||
874 | if (acpi_map_lsapic(handle, p_cpu)) | |
875 | return_VALUE(AE_ERROR); | |
876 | ||
877 | if (arch_register_cpu(*p_cpu)) { | |
878 | acpi_unmap_lsapic(*p_cpu); | |
879 | return_VALUE(AE_ERROR); | |
880 | } | |
881 | ||
882 | return_VALUE(AE_OK); | |
883 | } | |
884 | ||
4be44fcd | 885 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 LT |
886 | { |
887 | if (cpu_online(pr->id)) { | |
4be44fcd | 888 | return (-EINVAL); |
1da177e4 LT |
889 | } |
890 | arch_unregister_cpu(pr->id); | |
891 | acpi_unmap_lsapic(pr->id); | |
4be44fcd | 892 | return (0); |
1da177e4 LT |
893 | } |
894 | #else | |
4be44fcd | 895 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
896 | { |
897 | return AE_ERROR; | |
898 | } | |
4be44fcd | 899 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 900 | { |
4be44fcd | 901 | return (-EINVAL); |
1da177e4 LT |
902 | } |
903 | #endif | |
904 | ||
1da177e4 LT |
905 | static |
906 | void acpi_processor_install_hotplug_notify(void) | |
907 | { | |
908 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
909 | int action = INSTALL_NOTIFY_HANDLER; | |
910 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
911 | ACPI_ROOT_OBJECT, |
912 | ACPI_UINT32_MAX, | |
913 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
914 | #endif |
915 | } | |
916 | ||
1da177e4 LT |
917 | static |
918 | void acpi_processor_uninstall_hotplug_notify(void) | |
919 | { | |
920 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
921 | int action = UNINSTALL_NOTIFY_HANDLER; | |
922 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
923 | ACPI_ROOT_OBJECT, |
924 | ACPI_UINT32_MAX, | |
925 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
926 | #endif |
927 | } | |
928 | ||
929 | /* | |
930 | * We keep the driver loaded even when ACPI is not running. | |
931 | * This is needed for the powernow-k8 driver, that works even without | |
932 | * ACPI, but needs symbols from this driver | |
933 | */ | |
934 | ||
4be44fcd | 935 | static int __init acpi_processor_init(void) |
1da177e4 | 936 | { |
4be44fcd | 937 | int result = 0; |
1da177e4 LT |
938 | |
939 | ACPI_FUNCTION_TRACE("acpi_processor_init"); | |
940 | ||
941 | memset(&processors, 0, sizeof(processors)); | |
942 | memset(&errata, 0, sizeof(errata)); | |
943 | ||
944 | acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
945 | if (!acpi_processor_dir) | |
946 | return_VALUE(0); | |
947 | acpi_processor_dir->owner = THIS_MODULE; | |
948 | ||
949 | result = acpi_bus_register_driver(&acpi_processor_driver); | |
950 | if (result < 0) { | |
951 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
952 | return_VALUE(0); | |
953 | } | |
954 | ||
955 | acpi_processor_install_hotplug_notify(); | |
956 | ||
957 | acpi_thermal_cpufreq_init(); | |
958 | ||
959 | acpi_processor_ppc_init(); | |
960 | ||
961 | return_VALUE(0); | |
962 | } | |
963 | ||
4be44fcd | 964 | static void __exit acpi_processor_exit(void) |
1da177e4 LT |
965 | { |
966 | ACPI_FUNCTION_TRACE("acpi_processor_exit"); | |
967 | ||
968 | acpi_processor_ppc_exit(); | |
969 | ||
970 | acpi_thermal_cpufreq_exit(); | |
971 | ||
972 | acpi_processor_uninstall_hotplug_notify(); | |
973 | ||
974 | acpi_bus_unregister_driver(&acpi_processor_driver); | |
975 | ||
976 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
977 | ||
978 | return_VOID; | |
979 | } | |
980 | ||
1da177e4 LT |
981 | module_init(acpi_processor_init); |
982 | module_exit(acpi_processor_exit); | |
983 | ||
984 | EXPORT_SYMBOL(acpi_processor_set_thermal_limit); | |
985 | ||
986 | MODULE_ALIAS("processor"); |