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SCSI: scsi_dh: check queuedata pointer before proceeding further
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / processor_core.c
blob71024740d62b178c784fd46c37b9ffca8c76f1a0
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, "Extensa 5220", {
138 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
139 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
140 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
141 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
142 {},
143 };
144
145 /* --------------------------------------------------------------------------
146 Errata Handling
147 -------------------------------------------------------------------------- */
148
149 static int acpi_processor_errata_piix4(struct pci_dev *dev)
150 {
151 u8 value1 = 0;
152 u8 value2 = 0;
153
154
155 if (!dev)
156 return -EINVAL;
157
158 /*
159 * Note that 'dev' references the PIIX4 ACPI Controller.
160 */
161
162 switch (dev->revision) {
163 case 0:
164 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
165 break;
166 case 1:
167 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
168 break;
169 case 2:
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
171 break;
172 case 3:
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
174 break;
175 default:
176 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
177 break;
178 }
179
180 switch (dev->revision) {
181
182 case 0: /* PIIX4 A-step */
183 case 1: /* PIIX4 B-step */
184 /*
185 * See specification changes #13 ("Manual Throttle Duty Cycle")
186 * and #14 ("Enabling and Disabling Manual Throttle"), plus
187 * erratum #5 ("STPCLK# Deassertion Time") from the January
188 * 2002 PIIX4 specification update. Applies to only older
189 * PIIX4 models.
190 */
191 errata.piix4.throttle = 1;
192
193 case 2: /* PIIX4E */
194 case 3: /* PIIX4M */
195 /*
196 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
197 * Livelock") from the January 2002 PIIX4 specification update.
198 * Applies to all PIIX4 models.
199 */
200
201 /*
202 * BM-IDE
203 * ------
204 * Find the PIIX4 IDE Controller and get the Bus Master IDE
205 * Status register address. We'll use this later to read
206 * each IDE controller's DMA status to make sure we catch all
207 * DMA activity.
208 */
209 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
210 PCI_DEVICE_ID_INTEL_82371AB,
211 PCI_ANY_ID, PCI_ANY_ID, NULL);
212 if (dev) {
213 errata.piix4.bmisx = pci_resource_start(dev, 4);
214 pci_dev_put(dev);
215 }
216
217 /*
218 * Type-F DMA
219 * ----------
220 * Find the PIIX4 ISA Controller and read the Motherboard
221 * DMA controller's status to see if Type-F (Fast) DMA mode
222 * is enabled (bit 7) on either channel. Note that we'll
223 * disable C3 support if this is enabled, as some legacy
224 * devices won't operate well if fast DMA is disabled.
225 */
226 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
227 PCI_DEVICE_ID_INTEL_82371AB_0,
228 PCI_ANY_ID, PCI_ANY_ID, NULL);
229 if (dev) {
230 pci_read_config_byte(dev, 0x76, &value1);
231 pci_read_config_byte(dev, 0x77, &value2);
232 if ((value1 & 0x80) || (value2 & 0x80))
233 errata.piix4.fdma = 1;
234 pci_dev_put(dev);
235 }
236
237 break;
238 }
239
240 if (errata.piix4.bmisx)
241 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
242 "Bus master activity detection (BM-IDE) erratum enabled\n"));
243 if (errata.piix4.fdma)
244 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
245 "Type-F DMA livelock erratum (C3 disabled)\n"));
246
247 return 0;
248 }
249
250 static int acpi_processor_errata(struct acpi_processor *pr)
251 {
252 int result = 0;
253 struct pci_dev *dev = NULL;
254
255
256 if (!pr)
257 return -EINVAL;
258
259 /*
260 * PIIX4
261 */
262 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
263 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
264 PCI_ANY_ID, NULL);
265 if (dev) {
266 result = acpi_processor_errata_piix4(dev);
267 pci_dev_put(dev);
268 }
269
270 return result;
271 }
272
273 /* --------------------------------------------------------------------------
274 Common ACPI processor functions
275 -------------------------------------------------------------------------- */
276
277 /*
278 * _PDC is required for a BIOS-OS handshake for most of the newer
279 * ACPI processor features.
280 */
281 static int acpi_processor_set_pdc(struct acpi_processor *pr)
282 {
283 struct acpi_object_list *pdc_in = pr->pdc;
284 acpi_status status = AE_OK;
285
286
287 if (!pdc_in)
288 return status;
289 if (idle_nomwait) {
290 /*
291 * If mwait is disabled for CPU C-states, the C2C3_FFH access
292 * mode will be disabled in the parameter of _PDC object.
293 * Of course C1_FFH access mode will also be disabled.
294 */
295 union acpi_object *obj;
296 u32 *buffer = NULL;
297
298 obj = pdc_in->pointer;
299 buffer = (u32 *)(obj->buffer.pointer);
300 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
301
302 }
303 status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
304
305 if (ACPI_FAILURE(status))
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307 "Could not evaluate _PDC, using legacy perf. control...\n"));
308
309 return status;
310 }
311
312 /* --------------------------------------------------------------------------
313 FS Interface (/proc)
314 -------------------------------------------------------------------------- */
315
316 #ifdef CONFIG_ACPI_PROCFS
317 static struct proc_dir_entry *acpi_processor_dir = NULL;
318
319 static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
320 {
321 struct acpi_processor *pr = seq->private;
322
323
324 if (!pr)
325 goto end;
326
327 seq_printf(seq, "processor id: %d\n"
328 "acpi id: %d\n"
329 "bus mastering control: %s\n"
330 "power management: %s\n"
331 "throttling control: %s\n"
332 "limit interface: %s\n",
333 pr->id,
334 pr->acpi_id,
335 pr->flags.bm_control ? "yes" : "no",
336 pr->flags.power ? "yes" : "no",
337 pr->flags.throttling ? "yes" : "no",
338 pr->flags.limit ? "yes" : "no");
339
340 end:
341 return 0;
342 }
343
344 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
345 {
346 return single_open(file, acpi_processor_info_seq_show,
347 PDE(inode)->data);
348 }
349
350 static int acpi_processor_add_fs(struct acpi_device *device)
351 {
352 struct proc_dir_entry *entry = NULL;
353
354
355 if (!acpi_device_dir(device)) {
356 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
357 acpi_processor_dir);
358 if (!acpi_device_dir(device))
359 return -ENODEV;
360 }
361
362 /* 'info' [R] */
363 entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO,
364 S_IRUGO, acpi_device_dir(device),
365 &acpi_processor_info_fops,
366 acpi_driver_data(device));
367 if (!entry)
368 return -EIO;
369
370 /* 'throttling' [R/W] */
371 entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING,
372 S_IFREG | S_IRUGO | S_IWUSR,
373 acpi_device_dir(device),
374 &acpi_processor_throttling_fops,
375 acpi_driver_data(device));
376 if (!entry)
377 return -EIO;
378
379 /* 'limit' [R/W] */
380 entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT,
381 S_IFREG | S_IRUGO | S_IWUSR,
382 acpi_device_dir(device),
383 &acpi_processor_limit_fops,
384 acpi_driver_data(device));
385 if (!entry)
386 return -EIO;
387 return 0;
388 }
389 static int acpi_processor_remove_fs(struct acpi_device *device)
390 {
391
392 if (acpi_device_dir(device)) {
393 remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
394 acpi_device_dir(device));
395 remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
396 acpi_device_dir(device));
397 remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
398 acpi_device_dir(device));
399 remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
400 acpi_device_dir(device) = NULL;
401 }
402
403 return 0;
404 }
405 #else
406 static inline int acpi_processor_add_fs(struct acpi_device *device)
407 {
408 return 0;
409 }
410 static inline int acpi_processor_remove_fs(struct acpi_device *device)
411 {
412 return 0;
413 }
414 #endif
415
416 /* Use the acpiid in MADT to map cpus in case of SMP */
417
418 #ifndef CONFIG_SMP
419 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; }
420 #else
421
422 static struct acpi_table_madt *madt;
423
424 static int map_lapic_id(struct acpi_subtable_header *entry,
425 u32 acpi_id, int *apic_id)
426 {
427 struct acpi_madt_local_apic *lapic =
428 (struct acpi_madt_local_apic *)entry;
429 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
430 lapic->processor_id == acpi_id) {
431 *apic_id = lapic->id;
432 return 1;
433 }
434 return 0;
435 }
436
437 static int map_x2apic_id(struct acpi_subtable_header *entry,
438 int device_declaration, u32 acpi_id, int *apic_id)
439 {
440 struct acpi_madt_local_x2apic *apic =
441 (struct acpi_madt_local_x2apic *)entry;
442 u32 tmp = apic->local_apic_id;
443
444 /* Only check enabled APICs*/
445 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
446 return 0;
447
448 /* Device statement declaration type */
449 if (device_declaration) {
450 if (apic->uid == acpi_id)
451 goto found;
452 }
453
454 return 0;
455 found:
456 *apic_id = tmp;
457 return 1;
458 }
459
460 static int map_lsapic_id(struct acpi_subtable_header *entry,
461 int device_declaration, u32 acpi_id, int *apic_id)
462 {
463 struct acpi_madt_local_sapic *lsapic =
464 (struct acpi_madt_local_sapic *)entry;
465 u32 tmp = (lsapic->id << 8) | lsapic->eid;
466
467 /* Only check enabled APICs*/
468 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
469 return 0;
470
471 /* Device statement declaration type */
472 if (device_declaration) {
473 if (entry->length < 16)
474 printk(KERN_ERR PREFIX
475 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
476 tmp);
477 else if (lsapic->uid == acpi_id)
478 goto found;
479 /* Processor statement declaration type */
480 } else if (lsapic->processor_id == acpi_id)
481 goto found;
482
483 return 0;
484 found:
485 *apic_id = tmp;
486 return 1;
487 }
488
489 static int map_madt_entry(int type, u32 acpi_id)
490 {
491 unsigned long madt_end, entry;
492 int apic_id = -1;
493
494 if (!madt)
495 return apic_id;
496
497 entry = (unsigned long)madt;
498 madt_end = entry + madt->header.length;
499
500 /* Parse all entries looking for a match. */
501
502 entry += sizeof(struct acpi_table_madt);
503 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
504 struct acpi_subtable_header *header =
505 (struct acpi_subtable_header *)entry;
506 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
507 if (map_lapic_id(header, acpi_id, &apic_id))
508 break;
509 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
510 if (map_x2apic_id(header, type, acpi_id, &apic_id))
511 break;
512 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
513 if (map_lsapic_id(header, type, acpi_id, &apic_id))
514 break;
515 }
516 entry += header->length;
517 }
518 return apic_id;
519 }
520
521 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
522 {
523 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
524 union acpi_object *obj;
525 struct acpi_subtable_header *header;
526 int apic_id = -1;
527
528 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
529 goto exit;
530
531 if (!buffer.length || !buffer.pointer)
532 goto exit;
533
534 obj = buffer.pointer;
535 if (obj->type != ACPI_TYPE_BUFFER ||
536 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
537 goto exit;
538 }
539
540 header = (struct acpi_subtable_header *)obj->buffer.pointer;
541 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
542 map_lapic_id(header, acpi_id, &apic_id);
543 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
544 map_lsapic_id(header, type, acpi_id, &apic_id);
545 }
546
547 exit:
548 if (buffer.pointer)
549 kfree(buffer.pointer);
550 return apic_id;
551 }
552
553 static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id)
554 {
555 int i;
556 int apic_id = -1;
557
558 apic_id = map_mat_entry(handle, type, acpi_id);
559 if (apic_id == -1)
560 apic_id = map_madt_entry(type, acpi_id);
561 if (apic_id == -1)
562 return apic_id;
563
564 for_each_possible_cpu(i) {
565 if (cpu_physical_id(i) == apic_id)
566 return i;
567 }
568 return -1;
569 }
570 #endif
571
572 /* --------------------------------------------------------------------------
573 Driver Interface
574 -------------------------------------------------------------------------- */
575
576 static int acpi_processor_get_info(struct acpi_device *device)
577 {
578 acpi_status status = 0;
579 union acpi_object object = { 0 };
580 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
581 struct acpi_processor *pr;
582 int cpu_index, device_declaration = 0;
583 static int cpu0_initialized;
584
585 pr = acpi_driver_data(device);
586 if (!pr)
587 return -EINVAL;
588
589 if (num_online_cpus() > 1)
590 errata.smp = TRUE;
591
592 acpi_processor_errata(pr);
593
594 /*
595 * Check to see if we have bus mastering arbitration control. This
596 * is required for proper C3 usage (to maintain cache coherency).
597 */
598 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
599 pr->flags.bm_control = 1;
600 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
601 "Bus mastering arbitration control present\n"));
602 } else
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604 "No bus mastering arbitration control\n"));
605
606 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
607 /* Declared with "Processor" statement; match ProcessorID */
608 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
609 if (ACPI_FAILURE(status)) {
610 printk(KERN_ERR PREFIX "Evaluating processor object\n");
611 return -ENODEV;
612 }
613
614 /*
615 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
616 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
617 * arch/xxx/acpi.c
618 */
619 pr->acpi_id = object.processor.proc_id;
620 } else {
621 /*
622 * Declared with "Device" statement; match _UID.
623 * Note that we don't handle string _UIDs yet.
624 */
625 unsigned long long value;
626 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
627 NULL, &value);
628 if (ACPI_FAILURE(status)) {
629 printk(KERN_ERR PREFIX
630 "Evaluating processor _UID [%#x]\n", status);
631 return -ENODEV;
632 }
633 device_declaration = 1;
634 pr->acpi_id = value;
635 }
636 cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id);
637
638 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
639 if (!cpu0_initialized && (cpu_index == -1) &&
640 (num_online_cpus() == 1)) {
641 cpu_index = 0;
642 }
643
644 cpu0_initialized = 1;
645
646 pr->id = cpu_index;
647
648 /*
649 * Extra Processor objects may be enumerated on MP systems with
650 * less than the max # of CPUs. They should be ignored _iff
651 * they are physically not present.
652 */
653 if (pr->id == -1) {
654 if (ACPI_FAILURE
655 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
656 return -ENODEV;
657 }
658 }
659 /*
660 * On some boxes several processors use the same processor bus id.
661 * But they are located in different scope. For example:
662 * \_SB.SCK0.CPU0
663 * \_SB.SCK1.CPU0
664 * Rename the processor device bus id. And the new bus id will be
665 * generated as the following format:
666 * CPU+CPU ID.
667 */
668 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
669 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
670 pr->acpi_id));
671
672 if (!object.processor.pblk_address)
673 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
674 else if (object.processor.pblk_length != 6)
675 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
676 object.processor.pblk_length);
677 else {
678 pr->throttling.address = object.processor.pblk_address;
679 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
680 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
681
682 pr->pblk = object.processor.pblk_address;
683
684 /*
685 * We don't care about error returns - we just try to mark
686 * these reserved so that nobody else is confused into thinking
687 * that this region might be unused..
688 *
689 * (In particular, allocating the IO range for Cardbus)
690 */
691 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
692 }
693
694 /*
695 * If ACPI describes a slot number for this CPU, we can use it
696 * ensure we get the right value in the "physical id" field
697 * of /proc/cpuinfo
698 */
699 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
700 if (ACPI_SUCCESS(status))
701 arch_fix_phys_package_id(pr->id, object.integer.value);
702
703 return 0;
704 }
705
706 static DEFINE_PER_CPU(void *, processor_device_array);
707
708 static void acpi_processor_notify(struct acpi_device *device, u32 event)
709 {
710 struct acpi_processor *pr = acpi_driver_data(device);
711 int saved;
712
713 if (!pr)
714 return;
715
716 switch (event) {
717 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
718 saved = pr->performance_platform_limit;
719 acpi_processor_ppc_has_changed(pr);
720 if (saved == pr->performance_platform_limit)
721 break;
722 acpi_bus_generate_proc_event(device, event,
723 pr->performance_platform_limit);
724 acpi_bus_generate_netlink_event(device->pnp.device_class,
725 dev_name(&device->dev), event,
726 pr->performance_platform_limit);
727 break;
728 case ACPI_PROCESSOR_NOTIFY_POWER:
729 acpi_processor_cst_has_changed(pr);
730 acpi_bus_generate_proc_event(device, event, 0);
731 acpi_bus_generate_netlink_event(device->pnp.device_class,
732 dev_name(&device->dev), event, 0);
733 break;
734 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
735 acpi_processor_tstate_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 default:
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
741 "Unsupported event [0x%x]\n", event));
742 break;
743 }
744
745 return;
746 }
747
748 static int acpi_cpu_soft_notify(struct notifier_block *nfb,
749 unsigned long action, void *hcpu)
750 {
751 unsigned int cpu = (unsigned long)hcpu;
752 struct acpi_processor *pr = per_cpu(processors, cpu);
753
754 if (action == CPU_ONLINE && pr) {
755 acpi_processor_ppc_has_changed(pr);
756 acpi_processor_cst_has_changed(pr);
757 acpi_processor_tstate_has_changed(pr);
758 }
759 return NOTIFY_OK;
760 }
761
762 static struct notifier_block acpi_cpu_notifier =
763 {
764 .notifier_call = acpi_cpu_soft_notify,
765 };
766
767 static int __cpuinit acpi_processor_add(struct acpi_device *device)
768 {
769 struct acpi_processor *pr = NULL;
770 int result = 0;
771 struct sys_device *sysdev;
772
773 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
774 if (!pr)
775 return -ENOMEM;
776
777 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
778 kfree(pr);
779 return -ENOMEM;
780 }
781
782 pr->handle = device->handle;
783 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
784 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
785 device->driver_data = pr;
786
787 result = acpi_processor_get_info(device);
788 if (result) {
789 /* Processor is physically not present */
790 return 0;
791 }
792
793 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
794
795 /*
796 * Buggy BIOS check
797 * ACPI id of processors can be reported wrongly by the BIOS.
798 * Don't trust it blindly
799 */
800 if (per_cpu(processor_device_array, pr->id) != NULL &&
801 per_cpu(processor_device_array, pr->id) != device) {
802 printk(KERN_WARNING "BIOS reported wrong ACPI id "
803 "for the processor\n");
804 result = -ENODEV;
805 goto err_free_cpumask;
806 }
807 per_cpu(processor_device_array, pr->id) = device;
808
809 per_cpu(processors, pr->id) = pr;
810
811 result = acpi_processor_add_fs(device);
812 if (result)
813 goto err_free_cpumask;
814
815 sysdev = get_cpu_sysdev(pr->id);
816 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
817 result = -EFAULT;
818 goto err_remove_fs;
819 }
820
821 /* _PDC call should be done before doing anything else (if reqd.). */
822 arch_acpi_processor_init_pdc(pr);
823 acpi_processor_set_pdc(pr);
824 arch_acpi_processor_cleanup_pdc(pr);
825
826 #ifdef CONFIG_CPU_FREQ
827 acpi_processor_ppc_has_changed(pr);
828 #endif
829 acpi_processor_get_throttling_info(pr);
830 acpi_processor_get_limit_info(pr);
831
832
833 acpi_processor_power_init(pr, device);
834
835 pr->cdev = thermal_cooling_device_register("Processor", device,
836 &processor_cooling_ops);
837 if (IS_ERR(pr->cdev)) {
838 result = PTR_ERR(pr->cdev);
839 goto err_power_exit;
840 }
841
842 dev_info(&device->dev, "registered as cooling_device%d\n",
843 pr->cdev->id);
844
845 result = sysfs_create_link(&device->dev.kobj,
846 &pr->cdev->device.kobj,
847 "thermal_cooling");
848 if (result) {
849 printk(KERN_ERR PREFIX "Create sysfs link\n");
850 goto err_thermal_unregister;
851 }
852 result = sysfs_create_link(&pr->cdev->device.kobj,
853 &device->dev.kobj,
854 "device");
855 if (result) {
856 printk(KERN_ERR PREFIX "Create sysfs link\n");
857 goto err_remove_sysfs;
858 }
859
860 return 0;
861
862 err_remove_sysfs:
863 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
864 err_thermal_unregister:
865 thermal_cooling_device_unregister(pr->cdev);
866 err_power_exit:
867 acpi_processor_power_exit(pr, device);
868 err_remove_fs:
869 acpi_processor_remove_fs(device);
870 err_free_cpumask:
871 free_cpumask_var(pr->throttling.shared_cpu_map);
872
873 return result;
874 }
875
876 static int acpi_processor_remove(struct acpi_device *device, int type)
877 {
878 struct acpi_processor *pr = NULL;
879
880
881 if (!device || !acpi_driver_data(device))
882 return -EINVAL;
883
884 pr = acpi_driver_data(device);
885
886 if (pr->id >= nr_cpu_ids)
887 goto free;
888
889 if (type == ACPI_BUS_REMOVAL_EJECT) {
890 if (acpi_processor_handle_eject(pr))
891 return -EINVAL;
892 }
893
894 acpi_processor_power_exit(pr, device);
895
896 sysfs_remove_link(&device->dev.kobj, "sysdev");
897
898 acpi_processor_remove_fs(device);
899
900 if (pr->cdev) {
901 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
902 sysfs_remove_link(&pr->cdev->device.kobj, "device");
903 thermal_cooling_device_unregister(pr->cdev);
904 pr->cdev = NULL;
905 }
906
907 per_cpu(processors, pr->id) = NULL;
908 per_cpu(processor_device_array, pr->id) = NULL;
909
910 free:
911 free_cpumask_var(pr->throttling.shared_cpu_map);
912 kfree(pr);
913
914 return 0;
915 }
916
917 #ifdef CONFIG_ACPI_HOTPLUG_CPU
918 /****************************************************************************
919 * Acpi processor hotplug support *
920 ****************************************************************************/
921
922 static int is_processor_present(acpi_handle handle)
923 {
924 acpi_status status;
925 unsigned long long sta = 0;
926
927
928 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
929
930 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
931 return 1;
932
933 /*
934 * _STA is mandatory for a processor that supports hot plug
935 */
936 if (status == AE_NOT_FOUND)
937 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
938 "Processor does not support hot plug\n"));
939 else
940 ACPI_EXCEPTION((AE_INFO, status,
941 "Processor Device is not present"));
942 return 0;
943 }
944
945 static
946 int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
947 {
948 acpi_handle phandle;
949 struct acpi_device *pdev;
950
951
952 if (acpi_get_parent(handle, &phandle)) {
953 return -ENODEV;
954 }
955
956 if (acpi_bus_get_device(phandle, &pdev)) {
957 return -ENODEV;
958 }
959
960 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
961 return -ENODEV;
962 }
963
964 return 0;
965 }
966
967 static void __ref acpi_processor_hotplug_notify(acpi_handle handle,
968 u32 event, void *data)
969 {
970 struct acpi_processor *pr;
971 struct acpi_device *device = NULL;
972 int result;
973
974
975 switch (event) {
976 case ACPI_NOTIFY_BUS_CHECK:
977 case ACPI_NOTIFY_DEVICE_CHECK:
978 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
979 "Processor driver received %s event\n",
980 (event == ACPI_NOTIFY_BUS_CHECK) ?
981 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
982
983 if (!is_processor_present(handle))
984 break;
985
986 if (acpi_bus_get_device(handle, &device)) {
987 result = acpi_processor_device_add(handle, &device);
988 if (result)
989 printk(KERN_ERR PREFIX
990 "Unable to add the device\n");
991 break;
992 }
993 break;
994 case ACPI_NOTIFY_EJECT_REQUEST:
995 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
996 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
997
998 if (acpi_bus_get_device(handle, &device)) {
999 printk(KERN_ERR PREFIX
1000 "Device don't exist, dropping EJECT\n");
1001 break;
1002 }
1003 pr = acpi_driver_data(device);
1004 if (!pr) {
1005 printk(KERN_ERR PREFIX
1006 "Driver data is NULL, dropping EJECT\n");
1007 return;
1008 }
1009 break;
1010 default:
1011 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1012 "Unsupported event [0x%x]\n", event));
1013 break;
1014 }
1015
1016 return;
1017 }
1018
1019 static acpi_status
1020 processor_walk_namespace_cb(acpi_handle handle,
1021 u32 lvl, void *context, void **rv)
1022 {
1023 acpi_status status;
1024 int *action = context;
1025 acpi_object_type type = 0;
1026
1027 status = acpi_get_type(handle, &type);
1028 if (ACPI_FAILURE(status))
1029 return (AE_OK);
1030
1031 if (type != ACPI_TYPE_PROCESSOR)
1032 return (AE_OK);
1033
1034 switch (*action) {
1035 case INSTALL_NOTIFY_HANDLER:
1036 acpi_install_notify_handler(handle,
1037 ACPI_SYSTEM_NOTIFY,
1038 acpi_processor_hotplug_notify,
1039 NULL);
1040 break;
1041 case UNINSTALL_NOTIFY_HANDLER:
1042 acpi_remove_notify_handler(handle,
1043 ACPI_SYSTEM_NOTIFY,
1044 acpi_processor_hotplug_notify);
1045 break;
1046 default:
1047 break;
1048 }
1049
1050 return (AE_OK);
1051 }
1052
1053 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1054 {
1055
1056 if (!is_processor_present(handle)) {
1057 return AE_ERROR;
1058 }
1059
1060 if (acpi_map_lsapic(handle, p_cpu))
1061 return AE_ERROR;
1062
1063 if (arch_register_cpu(*p_cpu)) {
1064 acpi_unmap_lsapic(*p_cpu);
1065 return AE_ERROR;
1066 }
1067
1068 return AE_OK;
1069 }
1070
1071 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1072 {
1073 if (cpu_online(pr->id))
1074 cpu_down(pr->id);
1075
1076 arch_unregister_cpu(pr->id);
1077 acpi_unmap_lsapic(pr->id);
1078 return (0);
1079 }
1080 #else
1081 static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
1082 {
1083 return AE_ERROR;
1084 }
1085 static int acpi_processor_handle_eject(struct acpi_processor *pr)
1086 {
1087 return (-EINVAL);
1088 }
1089 #endif
1090
1091 static
1092 void acpi_processor_install_hotplug_notify(void)
1093 {
1094 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1095 int action = INSTALL_NOTIFY_HANDLER;
1096 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
1097 ACPI_ROOT_OBJECT,
1098 ACPI_UINT32_MAX,
1099 processor_walk_namespace_cb, &action, NULL);
1100 #endif
1101 register_hotcpu_notifier(&acpi_cpu_notifier);
1102 }
1103
1104 static
1105 void acpi_processor_uninstall_hotplug_notify(void)
1106 {
1107 #ifdef CONFIG_ACPI_HOTPLUG_CPU
1108 int action = UNINSTALL_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 unregister_hotcpu_notifier(&acpi_cpu_notifier);
1115 }
1116
1117 /*
1118 * We keep the driver loaded even when ACPI is not running.
1119 * This is needed for the powernow-k8 driver, that works even without
1120 * ACPI, but needs symbols from this driver
1121 */
1122
1123 static int __init acpi_processor_init(void)
1124 {
1125 int result = 0;
1126
1127 if (acpi_disabled)
1128 return 0;
1129
1130 memset(&errata, 0, sizeof(errata));
1131
1132 #ifdef CONFIG_SMP
1133 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
1134 (struct acpi_table_header **)&madt)))
1135 madt = NULL;
1136 #endif
1137 #ifdef CONFIG_ACPI_PROCFS
1138 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1139 if (!acpi_processor_dir)
1140 return -ENOMEM;
1141 #endif
1142 /*
1143 * Check whether the system is DMI table. If yes, OSPM
1144 * should not use mwait for CPU-states.
1145 */
1146 dmi_check_system(processor_idle_dmi_table);
1147 result = cpuidle_register_driver(&acpi_idle_driver);
1148 if (result < 0)
1149 goto out_proc;
1150
1151 result = acpi_bus_register_driver(&acpi_processor_driver);
1152 if (result < 0)
1153 goto out_cpuidle;
1154
1155 acpi_processor_install_hotplug_notify();
1156
1157 acpi_thermal_cpufreq_init();
1158
1159 acpi_processor_ppc_init();
1160
1161 acpi_processor_throttling_init();
1162
1163 return 0;
1164
1165 out_cpuidle:
1166 cpuidle_unregister_driver(&acpi_idle_driver);
1167
1168 out_proc:
1169 #ifdef CONFIG_ACPI_PROCFS
1170 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1171 #endif
1172
1173 return result;
1174 }
1175
1176 static void __exit acpi_processor_exit(void)
1177 {
1178 if (acpi_disabled)
1179 return;
1180
1181 acpi_processor_ppc_exit();
1182
1183 acpi_thermal_cpufreq_exit();
1184
1185 acpi_processor_uninstall_hotplug_notify();
1186
1187 acpi_bus_unregister_driver(&acpi_processor_driver);
1188
1189 cpuidle_unregister_driver(&acpi_idle_driver);
1190
1191 #ifdef CONFIG_ACPI_PROCFS
1192 remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
1193 #endif
1194
1195 return;
1196 }
1197
1198 module_init(acpi_processor_init);
1199 module_exit(acpi_processor_exit);
1200
1201 EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
1202
1203 MODULE_ALIAS("processor");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree