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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]; |
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 | 124 | |
1da177e4 LT |
125 | |
126 | if (!dev) | |
d550d98d | 127 | return -EINVAL; |
1da177e4 LT |
128 | |
129 | /* | |
130 | * Note that 'dev' references the PIIX4 ACPI Controller. | |
131 | */ | |
132 | ||
133 | pci_read_config_byte(dev, PCI_REVISION_ID, &rev); | |
134 | ||
135 | switch (rev) { | |
136 | case 0: | |
137 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); | |
138 | break; | |
139 | case 1: | |
140 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); | |
141 | break; | |
142 | case 2: | |
143 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); | |
144 | break; | |
145 | case 3: | |
146 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); | |
147 | break; | |
148 | default: | |
149 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); | |
150 | break; | |
151 | } | |
152 | ||
153 | switch (rev) { | |
154 | ||
155 | case 0: /* PIIX4 A-step */ | |
156 | case 1: /* PIIX4 B-step */ | |
157 | /* | |
158 | * See specification changes #13 ("Manual Throttle Duty Cycle") | |
159 | * and #14 ("Enabling and Disabling Manual Throttle"), plus | |
160 | * erratum #5 ("STPCLK# Deassertion Time") from the January | |
161 | * 2002 PIIX4 specification update. Applies to only older | |
162 | * PIIX4 models. | |
163 | */ | |
164 | errata.piix4.throttle = 1; | |
165 | ||
166 | case 2: /* PIIX4E */ | |
167 | case 3: /* PIIX4M */ | |
168 | /* | |
169 | * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA | |
170 | * Livelock") from the January 2002 PIIX4 specification update. | |
171 | * Applies to all PIIX4 models. | |
172 | */ | |
173 | ||
174 | /* | |
175 | * BM-IDE | |
176 | * ------ | |
177 | * Find the PIIX4 IDE Controller and get the Bus Master IDE | |
178 | * Status register address. We'll use this later to read | |
179 | * each IDE controller's DMA status to make sure we catch all | |
180 | * DMA activity. | |
181 | */ | |
182 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
183 | PCI_DEVICE_ID_INTEL_82371AB, |
184 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
185 | if (dev) { |
186 | errata.piix4.bmisx = pci_resource_start(dev, 4); | |
187 | pci_dev_put(dev); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Type-F DMA | |
192 | * ---------- | |
193 | * Find the PIIX4 ISA Controller and read the Motherboard | |
194 | * DMA controller's status to see if Type-F (Fast) DMA mode | |
195 | * is enabled (bit 7) on either channel. Note that we'll | |
196 | * disable C3 support if this is enabled, as some legacy | |
197 | * devices won't operate well if fast DMA is disabled. | |
198 | */ | |
199 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
200 | PCI_DEVICE_ID_INTEL_82371AB_0, |
201 | PCI_ANY_ID, PCI_ANY_ID, NULL); | |
1da177e4 LT |
202 | if (dev) { |
203 | pci_read_config_byte(dev, 0x76, &value1); | |
204 | pci_read_config_byte(dev, 0x77, &value2); | |
205 | if ((value1 & 0x80) || (value2 & 0x80)) | |
206 | errata.piix4.fdma = 1; | |
207 | pci_dev_put(dev); | |
208 | } | |
209 | ||
210 | break; | |
211 | } | |
212 | ||
213 | if (errata.piix4.bmisx) | |
214 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 215 | "Bus master activity detection (BM-IDE) erratum enabled\n")); |
1da177e4 LT |
216 | if (errata.piix4.fdma) |
217 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 218 | "Type-F DMA livelock erratum (C3 disabled)\n")); |
1da177e4 | 219 | |
d550d98d | 220 | return 0; |
1da177e4 LT |
221 | } |
222 | ||
8713cbef | 223 | static int acpi_processor_errata(struct acpi_processor *pr) |
1da177e4 | 224 | { |
4be44fcd LB |
225 | int result = 0; |
226 | struct pci_dev *dev = NULL; | |
1da177e4 | 227 | |
1da177e4 LT |
228 | |
229 | if (!pr) | |
d550d98d | 230 | return -EINVAL; |
1da177e4 LT |
231 | |
232 | /* | |
233 | * PIIX4 | |
234 | */ | |
235 | dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, | |
4be44fcd LB |
236 | PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
237 | PCI_ANY_ID, NULL); | |
1da177e4 LT |
238 | if (dev) { |
239 | result = acpi_processor_errata_piix4(dev); | |
240 | pci_dev_put(dev); | |
241 | } | |
242 | ||
d550d98d | 243 | return result; |
1da177e4 LT |
244 | } |
245 | ||
02df8b93 | 246 | /* -------------------------------------------------------------------------- |
0b28002f | 247 | Common ACPI processor functions |
02df8b93 VP |
248 | -------------------------------------------------------------------------- */ |
249 | ||
250 | /* | |
251 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
252 | * ACPI processor features. | |
253 | */ | |
05131ecc | 254 | static int acpi_processor_set_pdc(struct acpi_processor *pr) |
02df8b93 | 255 | { |
05131ecc | 256 | struct acpi_object_list *pdc_in = pr->pdc; |
4be44fcd | 257 | acpi_status status = AE_OK; |
02df8b93 | 258 | |
02df8b93 | 259 | |
05131ecc | 260 | if (!pdc_in) |
d550d98d | 261 | return status; |
02df8b93 | 262 | |
05131ecc | 263 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); |
02df8b93 | 264 | |
05131ecc | 265 | if (ACPI_FAILURE(status)) |
4be44fcd | 266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
05131ecc | 267 | "Could not evaluate _PDC, using legacy perf. control...\n")); |
02df8b93 | 268 | |
d550d98d | 269 | return status; |
02df8b93 VP |
270 | } |
271 | ||
1da177e4 LT |
272 | /* -------------------------------------------------------------------------- |
273 | FS Interface (/proc) | |
274 | -------------------------------------------------------------------------- */ | |
275 | ||
4be44fcd | 276 | static struct proc_dir_entry *acpi_processor_dir = NULL; |
1da177e4 LT |
277 | |
278 | static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) | |
279 | { | |
4be44fcd | 280 | struct acpi_processor *pr = (struct acpi_processor *)seq->private; |
1da177e4 | 281 | |
1da177e4 LT |
282 | |
283 | if (!pr) | |
284 | goto end; | |
285 | ||
286 | seq_printf(seq, "processor id: %d\n" | |
4be44fcd LB |
287 | "acpi id: %d\n" |
288 | "bus mastering control: %s\n" | |
289 | "power management: %s\n" | |
290 | "throttling control: %s\n" | |
291 | "limit interface: %s\n", | |
292 | pr->id, | |
293 | pr->acpi_id, | |
294 | pr->flags.bm_control ? "yes" : "no", | |
295 | pr->flags.power ? "yes" : "no", | |
296 | pr->flags.throttling ? "yes" : "no", | |
297 | pr->flags.limit ? "yes" : "no"); | |
298 | ||
299 | end: | |
d550d98d | 300 | return 0; |
1da177e4 LT |
301 | } |
302 | ||
303 | static int acpi_processor_info_open_fs(struct inode *inode, struct file *file) | |
304 | { | |
305 | return single_open(file, acpi_processor_info_seq_show, | |
4be44fcd | 306 | PDE(inode)->data); |
1da177e4 LT |
307 | } |
308 | ||
4be44fcd | 309 | static int acpi_processor_add_fs(struct acpi_device *device) |
1da177e4 | 310 | { |
4be44fcd | 311 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 312 | |
1da177e4 LT |
313 | |
314 | if (!acpi_device_dir(device)) { | |
315 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 316 | acpi_processor_dir); |
1da177e4 | 317 | if (!acpi_device_dir(device)) |
d550d98d | 318 | return -ENODEV; |
1da177e4 LT |
319 | } |
320 | acpi_device_dir(device)->owner = THIS_MODULE; | |
321 | ||
322 | /* 'info' [R] */ | |
323 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, | |
4be44fcd | 324 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 325 | if (!entry) |
d550d98d | 326 | return -EIO; |
1da177e4 LT |
327 | else { |
328 | entry->proc_fops = &acpi_processor_info_fops; | |
329 | entry->data = acpi_driver_data(device); | |
330 | entry->owner = THIS_MODULE; | |
331 | } | |
332 | ||
333 | /* 'throttling' [R/W] */ | |
334 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, | |
4be44fcd LB |
335 | S_IFREG | S_IRUGO | S_IWUSR, |
336 | acpi_device_dir(device)); | |
1da177e4 | 337 | if (!entry) |
d550d98d | 338 | return -EIO; |
1da177e4 LT |
339 | else { |
340 | entry->proc_fops = &acpi_processor_throttling_fops; | |
1da177e4 LT |
341 | entry->data = acpi_driver_data(device); |
342 | entry->owner = THIS_MODULE; | |
343 | } | |
344 | ||
345 | /* 'limit' [R/W] */ | |
346 | entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
4be44fcd LB |
347 | S_IFREG | S_IRUGO | S_IWUSR, |
348 | acpi_device_dir(device)); | |
1da177e4 | 349 | if (!entry) |
d550d98d | 350 | return -EIO; |
1da177e4 LT |
351 | else { |
352 | entry->proc_fops = &acpi_processor_limit_fops; | |
1da177e4 LT |
353 | entry->data = acpi_driver_data(device); |
354 | entry->owner = THIS_MODULE; | |
355 | } | |
356 | ||
d550d98d | 357 | return 0; |
1da177e4 LT |
358 | } |
359 | ||
4be44fcd | 360 | static int acpi_processor_remove_fs(struct acpi_device *device) |
1da177e4 | 361 | { |
1da177e4 LT |
362 | |
363 | if (acpi_device_dir(device)) { | |
4be44fcd LB |
364 | remove_proc_entry(ACPI_PROCESSOR_FILE_INFO, |
365 | acpi_device_dir(device)); | |
1da177e4 | 366 | remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, |
4be44fcd LB |
367 | acpi_device_dir(device)); |
368 | remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, | |
369 | acpi_device_dir(device)); | |
1da177e4 LT |
370 | remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); |
371 | acpi_device_dir(device) = NULL; | |
372 | } | |
373 | ||
d550d98d | 374 | return 0; |
1da177e4 LT |
375 | } |
376 | ||
377 | /* Use the acpiid in MADT to map cpus in case of SMP */ | |
378 | #ifndef CONFIG_SMP | |
df42baa0 | 379 | #define convert_acpiid_to_cpu(acpi_id) (-1) |
1da177e4 LT |
380 | #else |
381 | ||
382 | #ifdef CONFIG_IA64 | |
383 | #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid | |
384 | #define arch_cpu_to_apicid ia64_cpu_to_sapicid | |
385 | #define ARCH_BAD_APICID (0xffff) | |
386 | #else | |
387 | #define arch_acpiid_to_apicid x86_acpiid_to_apicid | |
388 | #define arch_cpu_to_apicid x86_cpu_to_apicid | |
389 | #define ARCH_BAD_APICID (0xff) | |
390 | #endif | |
391 | ||
df42baa0 | 392 | static int convert_acpiid_to_cpu(u8 acpi_id) |
1da177e4 LT |
393 | { |
394 | u16 apic_id; | |
4a35a46b | 395 | int i; |
1da177e4 LT |
396 | |
397 | apic_id = arch_acpiid_to_apicid[acpi_id]; | |
398 | if (apic_id == ARCH_BAD_APICID) | |
399 | return -1; | |
400 | ||
401 | for (i = 0; i < NR_CPUS; i++) { | |
4a35a46b LB |
402 | if (arch_cpu_to_apicid[i] == apic_id) |
403 | return i; | |
1da177e4 LT |
404 | } |
405 | return -1; | |
406 | } | |
407 | #endif | |
408 | ||
409 | /* -------------------------------------------------------------------------- | |
410 | Driver Interface | |
411 | -------------------------------------------------------------------------- */ | |
412 | ||
4be44fcd | 413 | static int acpi_processor_get_info(struct acpi_processor *pr) |
1da177e4 | 414 | { |
4be44fcd LB |
415 | acpi_status status = 0; |
416 | union acpi_object object = { 0 }; | |
417 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
df42baa0 | 418 | int cpu_index; |
4be44fcd | 419 | static int cpu0_initialized; |
1da177e4 | 420 | |
1da177e4 LT |
421 | |
422 | if (!pr) | |
d550d98d | 423 | return -EINVAL; |
1da177e4 LT |
424 | |
425 | if (num_online_cpus() > 1) | |
426 | errata.smp = TRUE; | |
427 | ||
428 | acpi_processor_errata(pr); | |
429 | ||
430 | /* | |
431 | * Check to see if we have bus mastering arbitration control. This | |
432 | * is required for proper C3 usage (to maintain cache coherency). | |
433 | */ | |
434 | if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { | |
435 | pr->flags.bm_control = 1; | |
436 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
437 | "Bus mastering arbitration control present\n")); |
438 | } else | |
1da177e4 | 439 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd | 440 | "No bus mastering arbitration control\n")); |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Evalute the processor object. Note that it is common on SMP to | |
444 | * have the first (boot) processor with a valid PBLK address while | |
445 | * all others have a NULL address. | |
446 | */ | |
447 | status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); | |
448 | if (ACPI_FAILURE(status)) { | |
6468463a | 449 | printk(KERN_ERR PREFIX "Evaluating processor object\n"); |
d550d98d | 450 | return -ENODEV; |
1da177e4 LT |
451 | } |
452 | ||
453 | /* | |
454 | * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. | |
4be44fcd | 455 | * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c |
1da177e4 LT |
456 | */ |
457 | pr->acpi_id = object.processor.proc_id; | |
458 | ||
4a35a46b | 459 | cpu_index = convert_acpiid_to_cpu(pr->acpi_id); |
1da177e4 | 460 | |
4be44fcd | 461 | /* Handle UP system running SMP kernel, with no LAPIC in MADT */ |
df42baa0 | 462 | if (!cpu0_initialized && (cpu_index == -1) && |
4be44fcd LB |
463 | (num_online_cpus() == 1)) { |
464 | cpu_index = 0; | |
465 | } | |
466 | ||
467 | cpu0_initialized = 1; | |
468 | ||
469 | pr->id = cpu_index; | |
470 | ||
471 | /* | |
472 | * Extra Processor objects may be enumerated on MP systems with | |
473 | * less than the max # of CPUs. They should be ignored _iff | |
474 | * they are physically not present. | |
475 | */ | |
df42baa0 | 476 | if (cpu_index == -1) { |
4be44fcd LB |
477 | if (ACPI_FAILURE |
478 | (acpi_processor_hotadd_init(pr->handle, &pr->id))) { | |
6468463a LB |
479 | printk(KERN_ERR PREFIX |
480 | "Getting cpuindex for acpiid 0x%x\n", | |
481 | pr->acpi_id); | |
d550d98d | 482 | return -ENODEV; |
4be44fcd LB |
483 | } |
484 | } | |
1da177e4 LT |
485 | |
486 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, | |
4be44fcd | 487 | pr->acpi_id)); |
1da177e4 LT |
488 | |
489 | if (!object.processor.pblk_address) | |
490 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); | |
491 | else if (object.processor.pblk_length != 6) | |
6468463a LB |
492 | printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", |
493 | object.processor.pblk_length); | |
1da177e4 LT |
494 | else { |
495 | pr->throttling.address = object.processor.pblk_address; | |
496 | pr->throttling.duty_offset = acpi_fadt.duty_offset; | |
497 | pr->throttling.duty_width = acpi_fadt.duty_width; | |
498 | ||
499 | pr->pblk = object.processor.pblk_address; | |
500 | ||
501 | /* | |
502 | * We don't care about error returns - we just try to mark | |
503 | * these reserved so that nobody else is confused into thinking | |
504 | * that this region might be unused.. | |
505 | * | |
506 | * (In particular, allocating the IO range for Cardbus) | |
507 | */ | |
508 | request_region(pr->throttling.address, 6, "ACPI CPU throttle"); | |
509 | } | |
510 | ||
511 | #ifdef CONFIG_CPU_FREQ | |
512 | acpi_processor_ppc_has_changed(pr); | |
513 | #endif | |
514 | acpi_processor_get_throttling_info(pr); | |
515 | acpi_processor_get_limit_info(pr); | |
516 | ||
d550d98d | 517 | return 0; |
1da177e4 LT |
518 | } |
519 | ||
cd8e2b48 VP |
520 | static void *processor_device_array[NR_CPUS]; |
521 | ||
4be44fcd | 522 | static int acpi_processor_start(struct acpi_device *device) |
1da177e4 | 523 | { |
4be44fcd LB |
524 | int result = 0; |
525 | acpi_status status = AE_OK; | |
526 | struct acpi_processor *pr; | |
1da177e4 | 527 | |
1da177e4 LT |
528 | |
529 | pr = acpi_driver_data(device); | |
530 | ||
531 | result = acpi_processor_get_info(pr); | |
532 | if (result) { | |
533 | /* Processor is physically not present */ | |
d550d98d | 534 | return 0; |
1da177e4 LT |
535 | } |
536 | ||
537 | BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); | |
538 | ||
cd8e2b48 VP |
539 | /* |
540 | * Buggy BIOS check | |
541 | * ACPI id of processors can be reported wrongly by the BIOS. | |
542 | * Don't trust it blindly | |
543 | */ | |
544 | if (processor_device_array[pr->id] != NULL && | |
545 | processor_device_array[pr->id] != (void *)device) { | |
0eacee58 LB |
546 | printk(KERN_WARNING "BIOS reported wrong ACPI id" |
547 | "for the processor\n"); | |
d550d98d | 548 | return -ENODEV; |
cd8e2b48 VP |
549 | } |
550 | processor_device_array[pr->id] = (void *)device; | |
551 | ||
1da177e4 LT |
552 | processors[pr->id] = pr; |
553 | ||
554 | result = acpi_processor_add_fs(device); | |
555 | if (result) | |
556 | goto end; | |
557 | ||
558 | status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 559 | acpi_processor_notify, pr); |
1da177e4 | 560 | |
05131ecc VP |
561 | /* _PDC call should be done before doing anything else (if reqd.). */ |
562 | arch_acpi_processor_init_pdc(pr); | |
563 | acpi_processor_set_pdc(pr); | |
564 | ||
1da177e4 LT |
565 | acpi_processor_power_init(pr, device); |
566 | ||
567 | if (pr->flags.throttling) { | |
568 | printk(KERN_INFO PREFIX "%s [%s] (supports", | |
4be44fcd | 569 | acpi_device_name(device), acpi_device_bid(device)); |
1da177e4 LT |
570 | printk(" %d throttling states", pr->throttling.state_count); |
571 | printk(")\n"); | |
572 | } | |
573 | ||
4be44fcd | 574 | end: |
1da177e4 | 575 | |
d550d98d | 576 | return result; |
1da177e4 LT |
577 | } |
578 | ||
4be44fcd | 579 | static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 580 | { |
4be44fcd LB |
581 | struct acpi_processor *pr = (struct acpi_processor *)data; |
582 | struct acpi_device *device = NULL; | |
1da177e4 | 583 | |
1da177e4 LT |
584 | |
585 | if (!pr) | |
d550d98d | 586 | return; |
1da177e4 LT |
587 | |
588 | if (acpi_bus_get_device(pr->handle, &device)) | |
d550d98d | 589 | return; |
1da177e4 LT |
590 | |
591 | switch (event) { | |
592 | case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: | |
593 | acpi_processor_ppc_has_changed(pr); | |
594 | acpi_bus_generate_event(device, event, | |
4be44fcd | 595 | pr->performance_platform_limit); |
1da177e4 LT |
596 | break; |
597 | case ACPI_PROCESSOR_NOTIFY_POWER: | |
598 | acpi_processor_cst_has_changed(pr); | |
599 | acpi_bus_generate_event(device, event, 0); | |
600 | break; | |
601 | default: | |
602 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 603 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
604 | break; |
605 | } | |
606 | ||
d550d98d | 607 | return; |
1da177e4 LT |
608 | } |
609 | ||
4be44fcd | 610 | static int acpi_processor_add(struct acpi_device *device) |
1da177e4 | 611 | { |
4be44fcd | 612 | struct acpi_processor *pr = NULL; |
1da177e4 | 613 | |
1da177e4 LT |
614 | |
615 | if (!device) | |
d550d98d | 616 | return -EINVAL; |
1da177e4 LT |
617 | |
618 | pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); | |
619 | if (!pr) | |
d550d98d | 620 | return -ENOMEM; |
1da177e4 LT |
621 | memset(pr, 0, sizeof(struct acpi_processor)); |
622 | ||
623 | pr->handle = device->handle; | |
624 | strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); | |
625 | strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); | |
626 | acpi_driver_data(device) = pr; | |
627 | ||
d550d98d | 628 | return 0; |
1da177e4 LT |
629 | } |
630 | ||
4be44fcd | 631 | static int acpi_processor_remove(struct acpi_device *device, int type) |
1da177e4 | 632 | { |
4be44fcd LB |
633 | acpi_status status = AE_OK; |
634 | struct acpi_processor *pr = NULL; | |
1da177e4 | 635 | |
1da177e4 LT |
636 | |
637 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 638 | return -EINVAL; |
1da177e4 | 639 | |
4be44fcd | 640 | pr = (struct acpi_processor *)acpi_driver_data(device); |
1da177e4 LT |
641 | |
642 | if (pr->id >= NR_CPUS) { | |
643 | kfree(pr); | |
d550d98d | 644 | return 0; |
1da177e4 LT |
645 | } |
646 | ||
647 | if (type == ACPI_BUS_REMOVAL_EJECT) { | |
648 | if (acpi_processor_handle_eject(pr)) | |
d550d98d | 649 | return -EINVAL; |
1da177e4 LT |
650 | } |
651 | ||
652 | acpi_processor_power_exit(pr, device); | |
653 | ||
654 | status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, | |
4be44fcd | 655 | acpi_processor_notify); |
1da177e4 LT |
656 | |
657 | acpi_processor_remove_fs(device); | |
658 | ||
659 | processors[pr->id] = NULL; | |
660 | ||
661 | kfree(pr); | |
662 | ||
d550d98d | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
666 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
667 | /**************************************************************************** | |
668 | * Acpi processor hotplug support * | |
669 | ****************************************************************************/ | |
670 | ||
671 | static int is_processor_present(acpi_handle handle); | |
672 | ||
4be44fcd | 673 | static int is_processor_present(acpi_handle handle) |
1da177e4 | 674 | { |
4be44fcd LB |
675 | acpi_status status; |
676 | unsigned long sta = 0; | |
1da177e4 | 677 | |
1da177e4 LT |
678 | |
679 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
680 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { | |
a6fc6720 | 681 | ACPI_EXCEPTION((AE_INFO, status, "Processor Device is not present")); |
d550d98d | 682 | return 0; |
1da177e4 | 683 | } |
d550d98d | 684 | return 1; |
1da177e4 LT |
685 | } |
686 | ||
1da177e4 | 687 | static |
4be44fcd | 688 | int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) |
1da177e4 | 689 | { |
4be44fcd LB |
690 | acpi_handle phandle; |
691 | struct acpi_device *pdev; | |
692 | struct acpi_processor *pr; | |
1da177e4 | 693 | |
1da177e4 LT |
694 | |
695 | if (acpi_get_parent(handle, &phandle)) { | |
d550d98d | 696 | return -ENODEV; |
1da177e4 LT |
697 | } |
698 | ||
699 | if (acpi_bus_get_device(phandle, &pdev)) { | |
d550d98d | 700 | return -ENODEV; |
1da177e4 LT |
701 | } |
702 | ||
703 | if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { | |
d550d98d | 704 | return -ENODEV; |
1da177e4 LT |
705 | } |
706 | ||
3fb02738 | 707 | acpi_bus_start(*device); |
1da177e4 LT |
708 | |
709 | pr = acpi_driver_data(*device); | |
710 | if (!pr) | |
d550d98d | 711 | return -ENODEV; |
1da177e4 | 712 | |
4be44fcd | 713 | if ((pr->id >= 0) && (pr->id < NR_CPUS)) { |
312c004d | 714 | kobject_uevent(&(*device)->kobj, KOBJ_ONLINE); |
1da177e4 | 715 | } |
d550d98d | 716 | return 0; |
1da177e4 LT |
717 | } |
718 | ||
1da177e4 | 719 | static void |
4be44fcd | 720 | acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 721 | { |
4be44fcd LB |
722 | struct acpi_processor *pr; |
723 | struct acpi_device *device = NULL; | |
1da177e4 LT |
724 | int result; |
725 | ||
1da177e4 LT |
726 | |
727 | switch (event) { | |
728 | case ACPI_NOTIFY_BUS_CHECK: | |
729 | case ACPI_NOTIFY_DEVICE_CHECK: | |
730 | printk("Processor driver received %s event\n", | |
4be44fcd LB |
731 | (event == ACPI_NOTIFY_BUS_CHECK) ? |
732 | "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); | |
1da177e4 LT |
733 | |
734 | if (!is_processor_present(handle)) | |
735 | break; | |
736 | ||
737 | if (acpi_bus_get_device(handle, &device)) { | |
738 | result = acpi_processor_device_add(handle, &device); | |
739 | if (result) | |
6468463a LB |
740 | printk(KERN_ERR PREFIX |
741 | "Unable to add the device\n"); | |
1da177e4 LT |
742 | break; |
743 | } | |
744 | ||
745 | pr = acpi_driver_data(device); | |
746 | if (!pr) { | |
6468463a | 747 | printk(KERN_ERR PREFIX "Driver data is NULL\n"); |
1da177e4 LT |
748 | break; |
749 | } | |
750 | ||
751 | if (pr->id >= 0 && (pr->id < NR_CPUS)) { | |
312c004d | 752 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
753 | break; |
754 | } | |
755 | ||
756 | result = acpi_processor_start(device); | |
4be44fcd | 757 | if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { |
312c004d | 758 | kobject_uevent(&device->kobj, KOBJ_ONLINE); |
1da177e4 | 759 | } else { |
6468463a LB |
760 | printk(KERN_ERR PREFIX "Device [%s] failed to start\n", |
761 | acpi_device_bid(device)); | |
1da177e4 | 762 | } |
4be44fcd | 763 | break; |
1da177e4 | 764 | case ACPI_NOTIFY_EJECT_REQUEST: |
4be44fcd LB |
765 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
766 | "received ACPI_NOTIFY_EJECT_REQUEST\n")); | |
1da177e4 LT |
767 | |
768 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a LB |
769 | printk(KERN_ERR PREFIX |
770 | "Device don't exist, dropping EJECT\n"); | |
1da177e4 LT |
771 | break; |
772 | } | |
773 | pr = acpi_driver_data(device); | |
774 | if (!pr) { | |
6468463a LB |
775 | printk(KERN_ERR PREFIX |
776 | "Driver data is NULL, dropping EJECT\n"); | |
d550d98d | 777 | return; |
1da177e4 LT |
778 | } |
779 | ||
780 | if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) | |
312c004d | 781 | kobject_uevent(&device->kobj, KOBJ_OFFLINE); |
1da177e4 LT |
782 | break; |
783 | default: | |
784 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 785 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
786 | break; |
787 | } | |
788 | ||
d550d98d | 789 | return; |
1da177e4 LT |
790 | } |
791 | ||
792 | static acpi_status | |
793 | processor_walk_namespace_cb(acpi_handle handle, | |
4be44fcd | 794 | u32 lvl, void *context, void **rv) |
1da177e4 | 795 | { |
4be44fcd | 796 | acpi_status status; |
1da177e4 | 797 | int *action = context; |
4be44fcd | 798 | acpi_object_type type = 0; |
1da177e4 LT |
799 | |
800 | status = acpi_get_type(handle, &type); | |
801 | if (ACPI_FAILURE(status)) | |
4be44fcd | 802 | return (AE_OK); |
1da177e4 LT |
803 | |
804 | if (type != ACPI_TYPE_PROCESSOR) | |
4be44fcd | 805 | return (AE_OK); |
1da177e4 | 806 | |
4be44fcd | 807 | switch (*action) { |
1da177e4 LT |
808 | case INSTALL_NOTIFY_HANDLER: |
809 | acpi_install_notify_handler(handle, | |
4be44fcd LB |
810 | ACPI_SYSTEM_NOTIFY, |
811 | acpi_processor_hotplug_notify, | |
812 | NULL); | |
1da177e4 LT |
813 | break; |
814 | case UNINSTALL_NOTIFY_HANDLER: | |
815 | acpi_remove_notify_handler(handle, | |
4be44fcd LB |
816 | ACPI_SYSTEM_NOTIFY, |
817 | acpi_processor_hotplug_notify); | |
1da177e4 LT |
818 | break; |
819 | default: | |
820 | break; | |
821 | } | |
822 | ||
4be44fcd | 823 | return (AE_OK); |
1da177e4 LT |
824 | } |
825 | ||
4be44fcd | 826 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 | 827 | { |
1da177e4 LT |
828 | |
829 | if (!is_processor_present(handle)) { | |
d550d98d | 830 | return AE_ERROR; |
1da177e4 LT |
831 | } |
832 | ||
833 | if (acpi_map_lsapic(handle, p_cpu)) | |
d550d98d | 834 | return AE_ERROR; |
1da177e4 LT |
835 | |
836 | if (arch_register_cpu(*p_cpu)) { | |
837 | acpi_unmap_lsapic(*p_cpu); | |
d550d98d | 838 | return AE_ERROR; |
1da177e4 LT |
839 | } |
840 | ||
d550d98d | 841 | return AE_OK; |
1da177e4 LT |
842 | } |
843 | ||
4be44fcd | 844 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 LT |
845 | { |
846 | if (cpu_online(pr->id)) { | |
4be44fcd | 847 | return (-EINVAL); |
1da177e4 LT |
848 | } |
849 | arch_unregister_cpu(pr->id); | |
850 | acpi_unmap_lsapic(pr->id); | |
4be44fcd | 851 | return (0); |
1da177e4 LT |
852 | } |
853 | #else | |
4be44fcd | 854 | static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) |
1da177e4 LT |
855 | { |
856 | return AE_ERROR; | |
857 | } | |
4be44fcd | 858 | static int acpi_processor_handle_eject(struct acpi_processor *pr) |
1da177e4 | 859 | { |
4be44fcd | 860 | return (-EINVAL); |
1da177e4 LT |
861 | } |
862 | #endif | |
863 | ||
1da177e4 LT |
864 | static |
865 | void acpi_processor_install_hotplug_notify(void) | |
866 | { | |
867 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
868 | int action = INSTALL_NOTIFY_HANDLER; | |
869 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
870 | ACPI_ROOT_OBJECT, |
871 | ACPI_UINT32_MAX, | |
872 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
873 | #endif |
874 | } | |
875 | ||
1da177e4 LT |
876 | static |
877 | void acpi_processor_uninstall_hotplug_notify(void) | |
878 | { | |
879 | #ifdef CONFIG_ACPI_HOTPLUG_CPU | |
880 | int action = UNINSTALL_NOTIFY_HANDLER; | |
881 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, | |
4be44fcd LB |
882 | ACPI_ROOT_OBJECT, |
883 | ACPI_UINT32_MAX, | |
884 | processor_walk_namespace_cb, &action, NULL); | |
1da177e4 LT |
885 | #endif |
886 | } | |
887 | ||
888 | /* | |
889 | * We keep the driver loaded even when ACPI is not running. | |
890 | * This is needed for the powernow-k8 driver, that works even without | |
891 | * ACPI, but needs symbols from this driver | |
892 | */ | |
893 | ||
4be44fcd | 894 | static int __init acpi_processor_init(void) |
1da177e4 | 895 | { |
4be44fcd | 896 | int result = 0; |
1da177e4 | 897 | |
1da177e4 LT |
898 | |
899 | memset(&processors, 0, sizeof(processors)); | |
900 | memset(&errata, 0, sizeof(errata)); | |
901 | ||
902 | acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
903 | if (!acpi_processor_dir) | |
d550d98d | 904 | return 0; |
1da177e4 LT |
905 | acpi_processor_dir->owner = THIS_MODULE; |
906 | ||
907 | result = acpi_bus_register_driver(&acpi_processor_driver); | |
908 | if (result < 0) { | |
909 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
d550d98d | 910 | return 0; |
1da177e4 LT |
911 | } |
912 | ||
913 | acpi_processor_install_hotplug_notify(); | |
914 | ||
915 | acpi_thermal_cpufreq_init(); | |
916 | ||
917 | acpi_processor_ppc_init(); | |
918 | ||
d550d98d | 919 | return 0; |
1da177e4 LT |
920 | } |
921 | ||
4be44fcd | 922 | static void __exit acpi_processor_exit(void) |
1da177e4 | 923 | { |
1da177e4 LT |
924 | |
925 | acpi_processor_ppc_exit(); | |
926 | ||
927 | acpi_thermal_cpufreq_exit(); | |
928 | ||
929 | acpi_processor_uninstall_hotplug_notify(); | |
930 | ||
931 | acpi_bus_unregister_driver(&acpi_processor_driver); | |
932 | ||
933 | remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); | |
934 | ||
d550d98d | 935 | return; |
1da177e4 LT |
936 | } |
937 | ||
1da177e4 LT |
938 | module_init(acpi_processor_init); |
939 | module_exit(acpi_processor_exit); | |
940 | ||
941 | EXPORT_SYMBOL(acpi_processor_set_thermal_limit); | |
942 | ||
943 | MODULE_ALIAS("processor"); |