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ACPI: make sure every acpi_device has an ID
[deliverable/linux.git] / drivers / acpi / processor_core.c
1 /*
2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 * TBD:
28 * 1. Make # power states dynamic.
29 * 2. Support duty_cycle values that span bit 4.
30 * 3. Optimize by having scheduler determine business instead of
31 * having us try to calculate it here.
32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
33 */
34
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/pci.h>
40 #include <linux/pm.h>
41 #include <linux/cpufreq.h>
42 #include <linux/cpu.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/dmi.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cpuidle.h>
48
49 #include <asm/io.h>
50 #include <asm/system.h>
51 #include <asm/cpu.h>
52 #include <asm/delay.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55 #include <asm/smp.h>
56 #include <asm/acpi.h>
57
58 #include <acpi/acpi_bus.h>
59 #include <acpi/acpi_drivers.h>
60 #include <acpi/processor.h>
61
62 #define PREFIX "ACPI: "
63
64 #define ACPI_PROCESSOR_CLASS "processor"
65 #define ACPI_PROCESSOR_DEVICE_NAME "Processor"
66 #define ACPI_PROCESSOR_FILE_INFO "info"
67 #define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
68 #define ACPI_PROCESSOR_FILE_LIMIT "limit"
69 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81
71 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
72
73 #define ACPI_PROCESSOR_LIMIT_USER 0
74 #define ACPI_PROCESSOR_LIMIT_THERMAL 1
75
76 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
77 ACPI_MODULE_NAME("processor_core");
78
79 MODULE_AUTHOR("Paul Diefenbaugh");
80 MODULE_DESCRIPTION("ACPI Processor Driver");
81 MODULE_LICENSE("GPL");
82
83 static int acpi_processor_add(struct acpi_device *device);
84 static int acpi_processor_remove(struct acpi_device *device, int type);
85 #ifdef CONFIG_ACPI_PROCFS
86 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
87 #endif
88 static void acpi_processor_notify(struct acpi_device *device, u32 event);
89 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
90 static int acpi_processor_handle_eject(struct acpi_processor *pr);
91
92
93 static const struct acpi_device_id processor_device_ids[] = {
94 {ACPI_PROCESSOR_OBJECT_HID, 0},
95 {"ACPI0007", 0},
96 {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
99
100 static struct acpi_driver acpi_processor_driver = {
101 .name = "processor",
102 .class = ACPI_PROCESSOR_CLASS,
103 .ids = processor_device_ids,
104 .ops = {
105 .add = acpi_processor_add,
106 .remove = acpi_processor_remove,
107 .suspend = acpi_processor_suspend,
108 .resume = acpi_processor_resume,
109 .notify = acpi_processor_notify,
110 },
111 };
112
113 #define INSTALL_NOTIFY_HANDLER 1
114 #define UNINSTALL_NOTIFY_HANDLER 2
115 #ifdef CONFIG_ACPI_PROCFS
116 static const struct file_operations acpi_processor_info_fops = {
117 .owner = THIS_MODULE,
118 .open = acpi_processor_info_open_fs,
119 .read = seq_read,
120 .llseek = seq_lseek,
121 .release = single_release,
122 };
123 #endif
124
125 DEFINE_PER_CPU(struct acpi_processor *, processors);
126 struct acpi_processor_errata errata __read_mostly;
127 static int set_no_mwait(const struct dmi_system_id *id)
128 {
129 printk(KERN_NOTICE PREFIX "%s detected - "
130 "disabling mwait for CPU C-states\n", id->ident);
131 idle_nomwait = 1;
132 return 0;
133 }
134
135 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
136 {
137 set_no_mwait, "IFL91 board", {
138 DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
139 DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
140 DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
141 DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
142 {
143 set_no_mwait, "Extensa 5220", {
144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
145 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
146 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
147 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
148 {},
149 };
150
151 /* --------------------------------------------------------------------------
152 Errata Handling
153 -------------------------------------------------------------------------- */
154
155 static int acpi_processor_errata_piix4(struct pci_dev *dev)
156 {
157 u8 value1 = 0;
158 u8 value2 = 0;
159
160
161 if (!dev)
162 return -EINVAL;
163
164 /*
165 * Note that 'dev' references the PIIX4 ACPI Controller.
166 */
167
168 switch (dev->revision) {
169 case 0:
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
171 break;
172 case 1:
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
174 break;
175 case 2:
176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
177 break;
178 case 3:
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
180 break;
181 default:
182 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
183 break;
184 }
185
186 switch (dev->revision) {
187
188 case 0: /* PIIX4 A-step */
189 case 1: /* PIIX4 B-step */
190 /*
191 * See specification changes #13 ("Manual Throttle Duty Cycle")
192 * and #14 ("Enabling and Disabling Manual Throttle"), plus
193 * erratum #5 ("STPCLK# Deassertion Time") from the January
194 * 2002 PIIX4 specification update. Applies to only older
195 * PIIX4 models.
196 */
197 errata.piix4.throttle = 1;
198
199 case 2: /* PIIX4E */
200 case 3: /* PIIX4M */
201 /*
202 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
203 * Livelock") from the January 2002 PIIX4 specification update.
204 * Applies to all PIIX4 models.
205 */
206
207 /*
208 * BM-IDE
209 * ------
210 * Find the PIIX4 IDE Controller and get the Bus Master IDE
211 * Status register address. We'll use this later to read
212 * each IDE controller's DMA status to make sure we catch all
213 * DMA activity.
214 */
215 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
216 PCI_DEVICE_ID_INTEL_82371AB,
217 PCI_ANY_ID, PCI_ANY_ID, NULL);
218 if (dev) {
219 errata.piix4.bmisx = pci_resource_start(dev, 4);
220 pci_dev_put(dev);
221 }
222
223 /*
224 * Type-F DMA
225 * ----------
226 * Find the PIIX4 ISA Controller and read the Motherboard
227 * DMA controller's status to see if Type-F (Fast) DMA mode
228 * is enabled (bit 7) on either channel. Note that we'll
229 * disable C3 support if this is enabled, as some legacy
230 * devices won't operate well if fast DMA is disabled.
231 */
232 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
233 PCI_DEVICE_ID_INTEL_82371AB_0,
234 PCI_ANY_ID, PCI_ANY_ID, NULL);
235 if (dev) {
236 pci_read_config_byte(dev, 0x76, &value1);
237 pci_read_config_byte(dev, 0x77, &value2);
238 if ((value1 & 0x80) || (value2 & 0x80))
239 errata.piix4.fdma = 1;
240 pci_dev_put(dev);
241 }
242
243 break;
244 }
245
246 if (errata.piix4.bmisx)
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
248 "Bus master activity detection (BM-IDE) erratum enabled\n"));
249 if (errata.piix4.fdma)
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "Type-F DMA livelock erratum (C3 disabled)\n"));
252
253 return 0;
254 }
255
256 static int acpi_processor_errata(struct acpi_processor *pr)
257 {
258 int result = 0;
259 struct pci_dev *dev = NULL;
260
261
262 if (!pr)
263 return -EINVAL;
264
265 /*
266 * PIIX4
267 */
268 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
269 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
270 PCI_ANY_ID, NULL);
271 if (dev) {
272 result = acpi_processor_errata_piix4(dev);
273 pci_dev_put(dev);
274 }
275
276 return result;
277 }
278
279 /* --------------------------------------------------------------------------
280 Common ACPI processor functions
281 -------------------------------------------------------------------------- */
282
283 /*
284 * _PDC is required for a BIOS-OS handshake for most of the newer
285 * ACPI processor features.
286 */
287 static int acpi_processor_set_pdc(struct acpi_processor *pr)
288 {
289 struct acpi_object_list *pdc_in = pr->pdc;
290 acpi_status status = AE_OK;
291
292
293 if (!pdc_in)
294 return status;
295 if (idle_nomwait) {
296 /*
297 * If mwait is disabled for CPU C-states, the C2C3_FFH access
298 * mode will be disabled in the parameter of _PDC object.
299 * Of course C1_FFH access mode will also be disabled.
300 */
301 union acpi_object *obj;
302 u32 *buffer = NULL;
303
304 obj = pdc_in->pointer;
305 buffer = (u32 *)(obj->buffer.pointer);
306 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
307
308 }
309 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
310
311 if (ACPI_FAILURE(status))
312 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
313 "Could not evaluate _PDC, using legacy perf. control...\n"));
314
315 return status;
316 }
317
318 /* --------------------------------------------------------------------------
319 FS Interface (/proc)
320 -------------------------------------------------------------------------- */
321
322 #ifdef CONFIG_ACPI_PROCFS
323 static struct proc_dir_entry *acpi_processor_dir = NULL;
324
325 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
326 {
327 struct acpi_processor *pr = seq->private;
328
329
330 if (!pr)
331 goto end;
332
333 seq_printf(seq, "processor id: %d\n"
334 "acpi id: %d\n"
335 "bus mastering control: %s\n"
336 "power management: %s\n"
337 "throttling control: %s\n"
338 "limit interface: %s\n",
339 pr->id,
340 pr->acpi_id,
341 pr->flags.bm_control ? "yes" : "no",
342 pr->flags.power ? "yes" : "no",
343 pr->flags.throttling ? "yes" : "no",
344 pr->flags.limit ? "yes" : "no");
345
346 end:
347 return 0;
348 }
349
350 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
351 {
352 return single_open(file, acpi_processor_info_seq_show,
353 PDE(inode)->data);
354 }
355
356 static int acpi_processor_add_fs(struct acpi_device *device)
357 {
358 struct proc_dir_entry *entry = NULL;
359
360
361 if (!acpi_device_dir(device)) {
362 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
363 acpi_processor_dir);
364 if (!acpi_device_dir(device))
365 return -ENODEV;
366 }
367
368 /* 'info' [R] */
369 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
370 S_IRUGO, acpi_device_dir(device),
371 &acpi_processor_info_fops,
372 acpi_driver_data(device));
373 if (!entry)
374 return -EIO;
375
376 /* 'throttling' [R/W] */
377 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
378 S_IFREG | S_IRUGO | S_IWUSR,
379 acpi_device_dir(device),
380 &acpi_processor_throttling_fops,
381 acpi_driver_data(device));
382 if (!entry)
383 return -EIO;
384
385 /* 'limit' [R/W] */
386 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
387 S_IFREG | S_IRUGO | S_IWUSR,
388 acpi_device_dir(device),
389 &acpi_processor_limit_fops,
390 acpi_driver_data(device));
391 if (!entry)
392 return -EIO;
393 return 0;
394 }
395 static int acpi_processor_remove_fs(struct acpi_device *device)
396 {
397
398 if (acpi_device_dir(device)) {
399 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
400 acpi_device_dir(device));
401 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
402 acpi_device_dir(device));
403 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
404 acpi_device_dir(device));
405 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
406 acpi_device_dir(device) = NULL;
407 }
408
409 return 0;
410 }
411 #else
412 static inline int acpi_processor_add_fs(struct acpi_device *device)
413 {
414 return 0;
415 }
416 static inline int acpi_processor_remove_fs(struct acpi_device *device)
417 {
418 return 0;
419 }
420 #endif
421
422 /* Use the acpiid in MADT to map cpus in case of SMP */
423
424 #ifndef CONFIG_SMP
425 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
426 #else
427
428 static struct acpi_table_madt *madt;
429
430 static int map_lapic_id(struct acpi_subtable_header *entry,
431 u32 acpi_id, int *apic_id)
432 {
433 struct acpi_madt_local_apic *lapic =
434 (struct acpi_madt_local_apic *)entry;
435 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
436 lapic->processor_id == acpi_id) {
437 *apic_id = lapic->id;
438 return 1;
439 }
440 return 0;
441 }
442
443 static int map_x2apic_id(struct acpi_subtable_header *entry,
444 int device_declaration, u32 acpi_id, int *apic_id)
445 {
446 struct acpi_madt_local_x2apic *apic =
447 (struct acpi_madt_local_x2apic *)entry;
448 u32 tmp = apic->local_apic_id;
449
450 /* Only check enabled APICs*/
451 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
452 return 0;
453
454 /* Device statement declaration type */
455 if (device_declaration) {
456 if (apic->uid == acpi_id)
457 goto found;
458 }
459
460 return 0;
461 found:
462 *apic_id = tmp;
463 return 1;
464 }
465
466 static int map_lsapic_id(struct acpi_subtable_header *entry,
467 int device_declaration, u32 acpi_id, int *apic_id)
468 {
469 struct acpi_madt_local_sapic *lsapic =
470 (struct acpi_madt_local_sapic *)entry;
471 u32 tmp = (lsapic->id << 8) | lsapic->eid;
472
473 /* Only check enabled APICs*/
474 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
475 return 0;
476
477 /* Device statement declaration type */
478 if (device_declaration) {
479 if (entry->length < 16)
480 printk(KERN_ERR PREFIX
481 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
482 tmp);
483 else if (lsapic->uid == acpi_id)
484 goto found;
485 /* Processor statement declaration type */
486 } else if (lsapic->processor_id == acpi_id)
487 goto found;
488
489 return 0;
490 found:
491 *apic_id = tmp;
492 return 1;
493 }
494
495 static int map_madt_entry(int type, u32 acpi_id)
496 {
497 unsigned long madt_end, entry;
498 int apic_id = -1;
499
500 if (!madt)
501 return apic_id;
502
503 entry = (unsigned long)madt;
504 madt_end = entry + madt->header.length;
505
506 /* Parse all entries looking for a match. */
507
508 entry += sizeof(struct acpi_table_madt);
509 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
510 struct acpi_subtable_header *header =
511 (struct acpi_subtable_header *)entry;
512 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
513 if (map_lapic_id(header, acpi_id, &apic_id))
514 break;
515 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
516 if (map_x2apic_id(header, type, acpi_id, &apic_id))
517 break;
518 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
519 if (map_lsapic_id(header, type, acpi_id, &apic_id))
520 break;
521 }
522 entry += header->length;
523 }
524 return apic_id;
525 }
526
527 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
528 {
529 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
530 union acpi_object *obj;
531 struct acpi_subtable_header *header;
532 int apic_id = -1;
533
534 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
535 goto exit;
536
537 if (!buffer.length || !buffer.pointer)
538 goto exit;
539
540 obj = buffer.pointer;
541 if (obj->type != ACPI_TYPE_BUFFER ||
542 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
543 goto exit;
544 }
545
546 header = (struct acpi_subtable_header *)obj->buffer.pointer;
547 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
548 map_lapic_id(header, acpi_id, &apic_id);
549 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
550 map_lsapic_id(header, type, acpi_id, &apic_id);
551 }
552
553 exit:
554 if (buffer.pointer)
555 kfree(buffer.pointer);
556 return apic_id;
557 }
558
559 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
560 {
561 int i;
562 int apic_id = -1;
563
564 apic_id = map_mat_entry(handle, type, acpi_id);
565 if (apic_id == -1)
566 apic_id = map_madt_entry(type, acpi_id);
567 if (apic_id == -1)
568 return apic_id;
569
570 for_each_possible_cpu(i) {
571 if (cpu_physical_id(i) == apic_id)
572 return i;
573 }
574 return -1;
575 }
576 #endif
577
578 /* --------------------------------------------------------------------------
579 Driver Interface
580 -------------------------------------------------------------------------- */
581
582 static int acpi_processor_get_info(struct acpi_device *device)
583 {
584 acpi_status status = 0;
585 union acpi_object object = { 0 };
586 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
587 struct acpi_processor *pr;
588 int cpu_index, device_declaration = 0;
589 static int cpu0_initialized;
590
591 pr = acpi_driver_data(device);
592 if (!pr)
593 return -EINVAL;
594
595 if (num_online_cpus() > 1)
596 errata.smp = TRUE;
597
598 acpi_processor_errata(pr);
599
600 /*
601 * Check to see if we have bus mastering arbitration control. This
602 * is required for proper C3 usage (to maintain cache coherency).
603 */
604 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
605 pr->flags.bm_control = 1;
606 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
607 "Bus mastering arbitration control present\n"));
608 } else
609 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
610 "No bus mastering arbitration control\n"));
611
612 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
613 /* Declared with "Processor" statement; match ProcessorID */
614 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
615 if (ACPI_FAILURE(status)) {
616 printk(KERN_ERR PREFIX "Evaluating processor object\n");
617 return -ENODEV;
618 }
619
620 /*
621 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
622 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
623 * arch/xxx/acpi.c
624 */
625 pr->acpi_id = object.processor.proc_id;
626 } else {
627 /*
628 * Declared with "Device" statement; match _UID.
629 * Note that we don't handle string _UIDs yet.
630 */
631 unsigned long long value;
632 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
633 NULL, &value);
634 if (ACPI_FAILURE(status)) {
635 printk(KERN_ERR PREFIX
636 "Evaluating processor _UID [%#x]\n", status);
637 return -ENODEV;
638 }
639 device_declaration = 1;
640 pr->acpi_id = value;
641 }
642 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
643
644 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
645 if (!cpu0_initialized && (cpu_index == -1) &&
646 (num_online_cpus() == 1)) {
647 cpu_index = 0;
648 }
649
650 cpu0_initialized = 1;
651
652 pr->id = cpu_index;
653
654 /*
655 * Extra Processor objects may be enumerated on MP systems with
656 * less than the max # of CPUs. They should be ignored _iff
657 * they are physically not present.
658 */
659 if (pr->id == -1) {
660 if (ACPI_FAILURE
661 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
662 return -ENODEV;
663 }
664 }
665 /*
666 * On some boxes several processors use the same processor bus id.
667 * But they are located in different scope. For example:
668 * \_SB.SCK0.CPU0
669 * \_SB.SCK1.CPU0
670 * Rename the processor device bus id. And the new bus id will be
671 * generated as the following format:
672 * CPU+CPU ID.
673 */
674 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
675 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
676 pr->acpi_id));
677
678 if (!object.processor.pblk_address)
679 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
680 else if (object.processor.pblk_length != 6)
681 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
682 object.processor.pblk_length);
683 else {
684 pr->throttling.address = object.processor.pblk_address;
685 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
686 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
687
688 pr->pblk = object.processor.pblk_address;
689
690 /*
691 * We don't care about error returns - we just try to mark
692 * these reserved so that nobody else is confused into thinking
693 * that this region might be unused..
694 *
695 * (In particular, allocating the IO range for Cardbus)
696 */
697 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
698 }
699
700 /*
701 * If ACPI describes a slot number for this CPU, we can use it
702 * ensure we get the right value in the "physical id" field
703 * of /proc/cpuinfo
704 */
705 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
706 if (ACPI_SUCCESS(status))
707 arch_fix_phys_package_id(pr->id, object.integer.value);
708
709 return 0;
710 }
711
712 static DEFINE_PER_CPU(void *, processor_device_array);
713
714 static void acpi_processor_notify(struct acpi_device *device, u32 event)
715 {
716 struct acpi_processor *pr = acpi_driver_data(device);
717 int saved;
718
719 if (!pr)
720 return;
721
722 switch (event) {
723 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
724 saved = pr->performance_platform_limit;
725 acpi_processor_ppc_has_changed(pr);
726 if (saved == pr->performance_platform_limit)
727 break;
728 acpi_bus_generate_proc_event(device, event,
729 pr->performance_platform_limit);
730 acpi_bus_generate_netlink_event(device->pnp.device_class,
731 dev_name(&device->dev), event,
732 pr->performance_platform_limit);
733 break;
734 case ACPI_PROCESSOR_NOTIFY_POWER:
735 acpi_processor_cst_has_changed(pr);
736 acpi_bus_generate_proc_event(device, event, 0);
737 acpi_bus_generate_netlink_event(device->pnp.device_class,
738 dev_name(&device->dev), event, 0);
739 break;
740 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
741 acpi_processor_tstate_has_changed(pr);
742 acpi_bus_generate_proc_event(device, event, 0);
743 acpi_bus_generate_netlink_event(device->pnp.device_class,
744 dev_name(&device->dev), event, 0);
745 default:
746 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
747 "Unsupported event [0x%x]\n", event));
748 break;
749 }
750
751 return;
752 }
753
754 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
755 unsigned long action, void *hcpu)
756 {
757 unsigned int cpu = (unsigned long)hcpu;
758 struct acpi_processor *pr = per_cpu(processors, cpu);
759
760 if (action == CPU_ONLINE && pr) {
761 acpi_processor_ppc_has_changed(pr);
762 acpi_processor_cst_has_changed(pr);
763 acpi_processor_tstate_has_changed(pr);
764 }
765 return NOTIFY_OK;
766 }
767
768 static struct notifier_block acpi_cpu_notifier =
769 {
770 .notifier_call = acpi_cpu_soft_notify,
771 };
772
773 static int acpi_processor_add(struct acpi_device *device)
774 {
775 struct acpi_processor *pr = NULL;
776 int result = 0;
777 struct sys_device *sysdev;
778
779 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
780 if (!pr)
781 return -ENOMEM;
782
783 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
784 kfree(pr);
785 return -ENOMEM;
786 }
787
788 pr->handle = device->handle;
789 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
790 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
791 device->driver_data = pr;
792
793 result = acpi_processor_get_info(device);
794 if (result) {
795 /* Processor is physically not present */
796 return 0;
797 }
798
799 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
800
801 /*
802 * Buggy BIOS check
803 * ACPI id of processors can be reported wrongly by the BIOS.
804 * Don't trust it blindly
805 */
806 if (per_cpu(processor_device_array, pr->id) != NULL &&
807 per_cpu(processor_device_array, pr->id) != device) {
808 printk(KERN_WARNING "BIOS reported wrong ACPI id "
809 "for the processor\n");
810 result = -ENODEV;
811 goto err_free_cpumask;
812 }
813 per_cpu(processor_device_array, pr->id) = device;
814
815 per_cpu(processors, pr->id) = pr;
816
817 result = acpi_processor_add_fs(device);
818 if (result)
819 goto err_free_cpumask;
820
821 sysdev = get_cpu_sysdev(pr->id);
822 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
823 result = -EFAULT;
824 goto err_remove_fs;
825 }
826
827 /* _PDC call should be done before doing anything else (if reqd.). */
828 arch_acpi_processor_init_pdc(pr);
829 acpi_processor_set_pdc(pr);
830 arch_acpi_processor_cleanup_pdc(pr);
831
832 #ifdef CONFIG_CPU_FREQ
833 acpi_processor_ppc_has_changed(pr);
834 #endif
835 acpi_processor_get_throttling_info(pr);
836 acpi_processor_get_limit_info(pr);
837
838
839 acpi_processor_power_init(pr, device);
840
841 pr->cdev = thermal_cooling_device_register("Processor", device,
842 &processor_cooling_ops);
843 if (IS_ERR(pr->cdev)) {
844 result = PTR_ERR(pr->cdev);
845 goto err_power_exit;
846 }
847
848 dev_info(&device->dev, "registered as cooling_device%d\n",
849 pr->cdev->id);
850
851 result = sysfs_create_link(&device->dev.kobj,
852 &pr->cdev->device.kobj,
853 "thermal_cooling");
854 if (result) {
855 printk(KERN_ERR PREFIX "Create sysfs link\n");
856 goto err_thermal_unregister;
857 }
858 result = sysfs_create_link(&pr->cdev->device.kobj,
859 &device->dev.kobj,
860 "device");
861 if (result) {
862 printk(KERN_ERR PREFIX "Create sysfs link\n");
863 goto err_remove_sysfs;
864 }
865
866 if (pr->flags.throttling) {
867 printk(KERN_INFO PREFIX "%s [%s] (supports",
868 acpi_device_name(device), acpi_device_bid(device));
869 printk(" %d throttling states", pr->throttling.state_count);
870 printk(")\n");
871 }
872
873 return 0;
874
875 err_remove_sysfs:
876 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
877 err_thermal_unregister:
878 thermal_cooling_device_unregister(pr->cdev);
879 err_power_exit:
880 acpi_processor_power_exit(pr, device);
881 err_remove_fs:
882 acpi_processor_remove_fs(device);
883 err_free_cpumask:
884 free_cpumask_var(pr->throttling.shared_cpu_map);
885
886 return result;
887 }
888
889 static int acpi_processor_remove(struct acpi_device *device, int type)
890 {
891 struct acpi_processor *pr = NULL;
892
893
894 if (!device || !acpi_driver_data(device))
895 return -EINVAL;
896
897 pr = acpi_driver_data(device);
898
899 if (pr->id >= nr_cpu_ids)
900 goto free;
901
902 if (type == ACPI_BUS_REMOVAL_EJECT) {
903 if (acpi_processor_handle_eject(pr))
904 return -EINVAL;
905 }
906
907 acpi_processor_power_exit(pr, device);
908
909 sysfs_remove_link(&device->dev.kobj, "sysdev");
910
911 acpi_processor_remove_fs(device);
912
913 if (pr->cdev) {
914 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
915 sysfs_remove_link(&pr->cdev->device.kobj, "device");
916 thermal_cooling_device_unregister(pr->cdev);
917 pr->cdev = NULL;
918 }
919
920 per_cpu(processors, pr->id) = NULL;
921 per_cpu(processor_device_array, pr->id) = NULL;
922
923 free:
924 free_cpumask_var(pr->throttling.shared_cpu_map);
925 kfree(pr);
926
927 return 0;
928 }
929
930 #ifdef CONFIG_ACPI_HOTPLUG_CPU
931 /****************************************************************************
932 * Acpi processor hotplug support *
933 ****************************************************************************/
934
935 static int is_processor_present(acpi_handle handle)
936 {
937 acpi_status status;
938 unsigned long long sta = 0;
939
940
941 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
942
943 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
944 return 1;
945
946 /*
947 * _STA is mandatory for a processor that supports hot plug
948 */
949 if (status == AE_NOT_FOUND)
950 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
951 "Processor does not support hot plug\n"));
952 else
953 ACPI_EXCEPTION((AE_INFO, status,
954 "Processor Device is not present"));
955 return 0;
956 }
957
958 static
959 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
960 {
961 acpi_handle phandle;
962 struct acpi_device *pdev;
963
964
965 if (acpi_get_parent(handle, &phandle)) {
966 return -ENODEV;
967 }
968
969 if (acpi_bus_get_device(phandle, &pdev)) {
970 return -ENODEV;
971 }
972
973 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
974 return -ENODEV;
975 }
976
977 return 0;
978 }
979
980 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
981 u32 event, void *data)
982 {
983 struct acpi_processor *pr;
984 struct acpi_device *device = NULL;
985 int result;
986
987
988 switch (event) {
989 case ACPI_NOTIFY_BUS_CHECK:
990 case ACPI_NOTIFY_DEVICE_CHECK:
991 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
992 "Processor driver received %s event\n",
993 (event == ACPI_NOTIFY_BUS_CHECK) ?
994 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
995
996 if (!is_processor_present(handle))
997 break;
998
999 if (acpi_bus_get_device(handle, &device)) {
1000 result = acpi_processor_device_add(handle, &device);
1001 if (result)
1002 printk(KERN_ERR PREFIX
1003 "Unable to add the device\n");
1004 break;
1005 }
1006 break;
1007 case ACPI_NOTIFY_EJECT_REQUEST:
1008 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1009 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
1010
1011 if (acpi_bus_get_device(handle, &device)) {
1012 printk(KERN_ERR PREFIX
1013 "Device don't exist, dropping EJECT\n");
1014 break;
1015 }
1016 pr = acpi_driver_data(device);
1017 if (!pr) {
1018 printk(KERN_ERR PREFIX
1019 "Driver data is NULL, dropping EJECT\n");
1020 return;
1021 }
1022 break;
1023 default:
1024 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1025 "Unsupported event [0x%x]\n", event));
1026 break;
1027 }
1028
1029 return;
1030 }
1031
1032 static acpi_status
1033 processor_walk_namespace_cb(acpi_handle handle,
1034 u32 lvl, void *context, void **rv)
1035 {
1036 acpi_status status;
1037 int *action = context;
1038 acpi_object_type type = 0;
1039
1040 status = acpi_get_type(handle, &type);
1041 if (ACPI_FAILURE(status))
1042 return (AE_OK);
1043
1044 if (type != ACPI_TYPE_PROCESSOR)
1045 return (AE_OK);
1046
1047 switch (*action) {
1048 case INSTALL_NOTIFY_HANDLER:
1049 acpi_install_notify_handler(handle,
1050 ACPI_SYSTEM_NOTIFY,
1051 acpi_processor_hotplug_notify,
1052 NULL);
1053 break;
1054 case UNINSTALL_NOTIFY_HANDLER:
1055 acpi_remove_notify_handler(handle,
1056 ACPI_SYSTEM_NOTIFY,
1057 acpi_processor_hotplug_notify);
1058 break;
1059 default:
1060 break;
1061 }
1062
1063 return (AE_OK);
1064 }
1065
1066 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1067 {
1068
1069 if (!is_processor_present(handle)) {
1070 return AE_ERROR;
1071 }
1072
1073 if (acpi_map_lsapic(handle, p_cpu))
1074 return AE_ERROR;
1075
1076 if (arch_register_cpu(*p_cpu)) {
1077 acpi_unmap_lsapic(*p_cpu);
1078 return AE_ERROR;
1079 }
1080
1081 return AE_OK;
1082 }
1083
1084 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1085 {
1086 if (cpu_online(pr->id))
1087 cpu_down(pr->id);
1088
1089 arch_unregister_cpu(pr->id);
1090 acpi_unmap_lsapic(pr->id);
1091 return (0);
1092 }
1093 #else
1094 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1095 {
1096 return AE_ERROR;
1097 }
1098 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1099 {
1100 return (-EINVAL);
1101 }
1102 #endif
1103
1104 static
1105 void acpi_processor_install_hotplug_notify(void)
1106 {
1107 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1108 int action = INSTALL_NOTIFY_HANDLER;
1109 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1110 ACPI_ROOT_OBJECT,
1111 ACPI_UINT32_MAX,
1112 processor_walk_namespace_cb, &action, NULL);
1113 #endif
1114 register_hotcpu_notifier(&acpi_cpu_notifier);
1115 }
1116
1117 static
1118 void acpi_processor_uninstall_hotplug_notify(void)
1119 {
1120 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1121 int action = UNINSTALL_NOTIFY_HANDLER;
1122 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1123 ACPI_ROOT_OBJECT,
1124 ACPI_UINT32_MAX,
1125 processor_walk_namespace_cb, &action, NULL);
1126 #endif
1127 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1128 }
1129
1130 /*
1131 * We keep the driver loaded even when ACPI is not running.
1132 * This is needed for the powernow-k8 driver, that works even without
1133 * ACPI, but needs symbols from this driver
1134 */
1135
1136 static int __init acpi_processor_init(void)
1137 {
1138 int result = 0;
1139
1140 if (acpi_disabled)
1141 return 0;
1142
1143 memset(&errata, 0, sizeof(errata));
1144
1145 #ifdef CONFIG_SMP
1146 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1147 (struct acpi_table_header **)&madt)))
1148 madt = NULL;
1149 #endif
1150 #ifdef CONFIG_ACPI_PROCFS
1151 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1152 if (!acpi_processor_dir)
1153 return -ENOMEM;
1154 #endif
1155 /*
1156 * Check whether the system is DMI table. If yes, OSPM
1157 * should not use mwait for CPU-states.
1158 */
1159 dmi_check_system(processor_idle_dmi_table);
1160 result = cpuidle_register_driver(&acpi_idle_driver);
1161 if (result < 0)
1162 goto out_proc;
1163
1164 result = acpi_bus_register_driver(&acpi_processor_driver);
1165 if (result < 0)
1166 goto out_cpuidle;
1167
1168 acpi_processor_install_hotplug_notify();
1169
1170 acpi_thermal_cpufreq_init();
1171
1172 acpi_processor_ppc_init();
1173
1174 acpi_processor_throttling_init();
1175
1176 return 0;
1177
1178 out_cpuidle:
1179 cpuidle_unregister_driver(&acpi_idle_driver);
1180
1181 out_proc:
1182 #ifdef CONFIG_ACPI_PROCFS
1183 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1184 #endif
1185
1186 return result;
1187 }
1188
1189 static void __exit acpi_processor_exit(void)
1190 {
1191 if (acpi_disabled)
1192 return;
1193
1194 acpi_processor_ppc_exit();
1195
1196 acpi_thermal_cpufreq_exit();
1197
1198 acpi_processor_uninstall_hotplug_notify();
1199
1200 acpi_bus_unregister_driver(&acpi_processor_driver);
1201
1202 cpuidle_unregister_driver(&acpi_idle_driver);
1203
1204 #ifdef CONFIG_ACPI_PROCFS
1205 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1206 #endif
1207
1208 return;
1209 }
1210
1211 module_init(acpi_processor_init);
1212 module_exit(acpi_processor_exit);
1213
1214 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1215
1216 MODULE_ALIAS("processor");
Linux kernel - Deliverables
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