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ACPI: Make _OSI(Linux) a special case
[pv_ops_mirror.git] / drivers / acpi / pci_link.c
blobacc594771379af521ef06a5f7a549ca781583d8d
1 /*
2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
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) 2002 Dominik Brodowski <devel@brodo.de>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 *
26 * TBD:
27 * 1. Support more than one IRQ resource entry per link device (index).
28 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
29 * for IRQ management (e.g. start()->_SRS).
30 */
31
32 #include <linux/sysdev.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/proc_fs.h>
38 #include <linux/spinlock.h>
39 #include <linux/pm.h>
40 #include <linux/pci.h>
41 #include <linux/mutex.h>
42
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45
46 #define _COMPONENT ACPI_PCI_COMPONENT
47 ACPI_MODULE_NAME("pci_link");
48 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
49 #define ACPI_PCI_LINK_HID "PNP0C0F"
50 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
51 #define ACPI_PCI_LINK_FILE_INFO "info"
52 #define ACPI_PCI_LINK_FILE_STATUS "state"
53 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
54 static int acpi_pci_link_add(struct acpi_device *device);
55 static int acpi_pci_link_remove(struct acpi_device *device, int type);
56
57 static struct acpi_driver acpi_pci_link_driver = {
58 .name = "pci_link",
59 .class = ACPI_PCI_LINK_CLASS,
60 .ids = ACPI_PCI_LINK_HID,
61 .ops = {
62 .add = acpi_pci_link_add,
63 .remove = acpi_pci_link_remove,
64 },
65 };
66
67 /*
68 * If a link is initialized, we never change its active and initialized
69 * later even the link is disable. Instead, we just repick the active irq
70 */
71 struct acpi_pci_link_irq {
72 u8 active; /* Current IRQ */
73 u8 triggering; /* All IRQs */
74 u8 polarity; /* All IRQs */
75 u8 resource_type;
76 u8 possible_count;
77 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
78 u8 initialized:1;
79 u8 reserved:7;
80 };
81
82 struct acpi_pci_link {
83 struct list_head node;
84 struct acpi_device *device;
85 struct acpi_pci_link_irq irq;
86 int refcnt;
87 };
88
89 static struct {
90 int count;
91 struct list_head entries;
92 } acpi_link;
93 DEFINE_MUTEX(acpi_link_lock);
94
95 /* --------------------------------------------------------------------------
96 PCI Link Device Management
97 -------------------------------------------------------------------------- */
98
99 /*
100 * set context (link) possible list from resource list
101 */
102 static acpi_status
103 acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
104 {
105 struct acpi_pci_link *link = context;
106 u32 i = 0;
107
108
109 switch (resource->type) {
110 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
111 return AE_OK;
112 case ACPI_RESOURCE_TYPE_IRQ:
113 {
114 struct acpi_resource_irq *p = &resource->data.irq;
115 if (!p || !p->interrupt_count) {
116 printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
117 return AE_OK;
118 }
119 for (i = 0;
120 (i < p->interrupt_count
121 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
122 if (!p->interrupts[i]) {
123 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
124 p->interrupts[i]);
125 continue;
126 }
127 link->irq.possible[i] = p->interrupts[i];
128 link->irq.possible_count++;
129 }
130 link->irq.triggering = p->triggering;
131 link->irq.polarity = p->polarity;
132 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
133 break;
134 }
135 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
136 {
137 struct acpi_resource_extended_irq *p =
138 &resource->data.extended_irq;
139 if (!p || !p->interrupt_count) {
140 printk(KERN_WARNING PREFIX
141 "Blank EXT IRQ resource\n");
142 return AE_OK;
143 }
144 for (i = 0;
145 (i < p->interrupt_count
146 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
147 if (!p->interrupts[i]) {
148 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
149 p->interrupts[i]);
150 continue;
151 }
152 link->irq.possible[i] = p->interrupts[i];
153 link->irq.possible_count++;
154 }
155 link->irq.triggering = p->triggering;
156 link->irq.polarity = p->polarity;
157 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
158 break;
159 }
160 default:
161 printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
162 return AE_OK;
163 }
164
165 return AE_CTRL_TERMINATE;
166 }
167
168 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
169 {
170 acpi_status status;
171
172
173 if (!link)
174 return -EINVAL;
175
176 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
177 acpi_pci_link_check_possible, link);
178 if (ACPI_FAILURE(status)) {
179 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
180 return -ENODEV;
181 }
182
183 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
184 "Found %d possible IRQs\n",
185 link->irq.possible_count));
186
187 return 0;
188 }
189
190 static acpi_status
191 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
192 {
193 int *irq = (int *)context;
194
195
196 switch (resource->type) {
197 case ACPI_RESOURCE_TYPE_IRQ:
198 {
199 struct acpi_resource_irq *p = &resource->data.irq;
200 if (!p || !p->interrupt_count) {
201 /*
202 * IRQ descriptors may have no IRQ# bits set,
203 * particularly those those w/ _STA disabled
204 */
205 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
206 "Blank IRQ resource\n"));
207 return AE_OK;
208 }
209 *irq = p->interrupts[0];
210 break;
211 }
212 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
213 {
214 struct acpi_resource_extended_irq *p =
215 &resource->data.extended_irq;
216 if (!p || !p->interrupt_count) {
217 /*
218 * extended IRQ descriptors must
219 * return at least 1 IRQ
220 */
221 printk(KERN_WARNING PREFIX
222 "Blank EXT IRQ resource\n");
223 return AE_OK;
224 }
225 *irq = p->interrupts[0];
226 break;
227 }
228 break;
229 default:
230 printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
231 case ACPI_RESOURCE_TYPE_END_TAG:
232 return AE_OK;
233 }
234 return AE_CTRL_TERMINATE;
235 }
236
237 /*
238 * Run _CRS and set link->irq.active
239 *
240 * return value:
241 * 0 - success
242 * !0 - failure
243 */
244 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
245 {
246 int result = 0;
247 acpi_status status = AE_OK;
248 int irq = 0;
249
250 if (!link)
251 return -EINVAL;
252
253 link->irq.active = 0;
254
255 /* in practice, status disabled is meaningless, ignore it */
256 if (acpi_strict) {
257 /* Query _STA, set link->device->status */
258 result = acpi_bus_get_status(link->device);
259 if (result) {
260 printk(KERN_ERR PREFIX "Unable to read status\n");
261 goto end;
262 }
263
264 if (!link->device->status.enabled) {
265 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
266 return 0;
267 }
268 }
269
270 /*
271 * Query and parse _CRS to get the current IRQ assignment.
272 */
273
274 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
275 acpi_pci_link_check_current, &irq);
276 if (ACPI_FAILURE(status)) {
277 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
278 result = -ENODEV;
279 goto end;
280 }
281
282 if (acpi_strict && !irq) {
283 printk(KERN_ERR PREFIX "_CRS returned 0\n");
284 result = -ENODEV;
285 }
286
287 link->irq.active = irq;
288
289 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
290
291 end:
292 return result;
293 }
294
295 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
296 {
297 int result = 0;
298 acpi_status status = AE_OK;
299 struct {
300 struct acpi_resource res;
301 struct acpi_resource end;
302 } *resource;
303 struct acpi_buffer buffer = { 0, NULL };
304
305
306 if (!link || !irq)
307 return -EINVAL;
308
309 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
310 if (!resource)
311 return -ENOMEM;
312
313 buffer.length = sizeof(*resource) + 1;
314 buffer.pointer = resource;
315
316 switch (link->irq.resource_type) {
317 case ACPI_RESOURCE_TYPE_IRQ:
318 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
319 resource->res.length = sizeof(struct acpi_resource);
320 resource->res.data.irq.triggering = link->irq.triggering;
321 resource->res.data.irq.polarity =
322 link->irq.polarity;
323 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
324 resource->res.data.irq.sharable =
325 ACPI_EXCLUSIVE;
326 else
327 resource->res.data.irq.sharable = ACPI_SHARED;
328 resource->res.data.irq.interrupt_count = 1;
329 resource->res.data.irq.interrupts[0] = irq;
330 break;
331
332 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
333 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
334 resource->res.length = sizeof(struct acpi_resource);
335 resource->res.data.extended_irq.producer_consumer =
336 ACPI_CONSUMER;
337 resource->res.data.extended_irq.triggering =
338 link->irq.triggering;
339 resource->res.data.extended_irq.polarity =
340 link->irq.polarity;
341 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
342 resource->res.data.irq.sharable =
343 ACPI_EXCLUSIVE;
344 else
345 resource->res.data.irq.sharable = ACPI_SHARED;
346 resource->res.data.extended_irq.interrupt_count = 1;
347 resource->res.data.extended_irq.interrupts[0] = irq;
348 /* ignore resource_source, it's optional */
349 break;
350 default:
351 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
352 result = -EINVAL;
353 goto end;
354
355 }
356 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
357
358 /* Attempt to set the resource */
359 status = acpi_set_current_resources(link->device->handle, &buffer);
360
361 /* check for total failure */
362 if (ACPI_FAILURE(status)) {
363 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
364 result = -ENODEV;
365 goto end;
366 }
367
368 /* Query _STA, set device->status */
369 result = acpi_bus_get_status(link->device);
370 if (result) {
371 printk(KERN_ERR PREFIX "Unable to read status\n");
372 goto end;
373 }
374 if (!link->device->status.enabled) {
375 printk(KERN_WARNING PREFIX
376 "%s [%s] disabled and referenced, BIOS bug\n",
377 acpi_device_name(link->device),
378 acpi_device_bid(link->device));
379 }
380
381 /* Query _CRS, set link->irq.active */
382 result = acpi_pci_link_get_current(link);
383 if (result) {
384 goto end;
385 }
386
387 /*
388 * Is current setting not what we set?
389 * set link->irq.active
390 */
391 if (link->irq.active != irq) {
392 /*
393 * policy: when _CRS doesn't return what we just _SRS
394 * assume _SRS worked and override _CRS value.
395 */
396 printk(KERN_WARNING PREFIX
397 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
398 acpi_device_name(link->device),
399 acpi_device_bid(link->device), link->irq.active, irq);
400 link->irq.active = irq;
401 }
402
403 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
404
405 end:
406 kfree(resource);
407 return result;
408 }
409
410 /* --------------------------------------------------------------------------
411 PCI Link IRQ Management
412 -------------------------------------------------------------------------- */
413
414 /*
415 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
416 * Link Devices to move the PIRQs around to minimize sharing.
417 *
418 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
419 * that the BIOS has already set to active. This is necessary because
420 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
421 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
422 * even if acpi_irq_nobalance is set.
423 *
424 * A tables of penalties avoids directing PCI interrupts to well known
425 * ISA IRQs. Boot params are available to over-ride the default table:
426 *
427 * List interrupts that are free for PCI use.
428 * acpi_irq_pci=n[,m]
429 *
430 * List interrupts that should not be used for PCI:
431 * acpi_irq_isa=n[,m]
432 *
433 * Note that PCI IRQ routers have a list of possible IRQs,
434 * which may not include the IRQs this table says are available.
435 *
436 * Since this heuristic can't tell the difference between a link
437 * that no device will attach to, vs. a link which may be shared
438 * by multiple active devices -- it is not optimal.
439 *
440 * If interrupt performance is that important, get an IO-APIC system
441 * with a pin dedicated to each device. Or for that matter, an MSI
442 * enabled system.
443 */
444
445 #define ACPI_MAX_IRQS 256
446 #define ACPI_MAX_ISA_IRQ 16
447
448 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
449 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
450 #define PIRQ_PENALTY_PCI_USING (16*16*16)
451 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
452 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
453 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
454
455 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
456 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
457 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
458 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
459 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
460 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
461 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
462 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
465 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
466 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
467 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
468 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
469 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
470 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
471 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
472 /* >IRQ15 */
473 };
474
475 int __init acpi_irq_penalty_init(void)
476 {
477 struct list_head *node = NULL;
478 struct acpi_pci_link *link = NULL;
479 int i = 0;
480
481
482 /*
483 * Update penalties to facilitate IRQ balancing.
484 */
485 list_for_each(node, &acpi_link.entries) {
486
487 link = list_entry(node, struct acpi_pci_link, node);
488 if (!link) {
489 printk(KERN_ERR PREFIX "Invalid link context\n");
490 continue;
491 }
492
493 /*
494 * reflect the possible and active irqs in the penalty table --
495 * useful for breaking ties.
496 */
497 if (link->irq.possible_count) {
498 int penalty =
499 PIRQ_PENALTY_PCI_POSSIBLE /
500 link->irq.possible_count;
501
502 for (i = 0; i < link->irq.possible_count; i++) {
503 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
504 acpi_irq_penalty[link->irq.
505 possible[i]] +=
506 penalty;
507 }
508
509 } else if (link->irq.active) {
510 acpi_irq_penalty[link->irq.active] +=
511 PIRQ_PENALTY_PCI_POSSIBLE;
512 }
513 }
514 /* Add a penalty for the SCI */
515 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
516
517 return 0;
518 }
519
520 static int acpi_irq_balance; /* 0: static, 1: balance */
521
522 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
523 {
524 int irq;
525 int i;
526
527
528 if (link->irq.initialized) {
529 if (link->refcnt == 0)
530 /* This means the link is disabled but initialized */
531 acpi_pci_link_set(link, link->irq.active);
532 return 0;
533 }
534
535 /*
536 * search for active IRQ in list of possible IRQs.
537 */
538 for (i = 0; i < link->irq.possible_count; ++i) {
539 if (link->irq.active == link->irq.possible[i])
540 break;
541 }
542 /*
543 * forget active IRQ that is not in possible list
544 */
545 if (i == link->irq.possible_count) {
546 if (acpi_strict)
547 printk(KERN_WARNING PREFIX "_CRS %d not found"
548 " in _PRS\n", link->irq.active);
549 link->irq.active = 0;
550 }
551
552 /*
553 * if active found, use it; else pick entry from end of possible list.
554 */
555 if (link->irq.active) {
556 irq = link->irq.active;
557 } else {
558 irq = link->irq.possible[link->irq.possible_count - 1];
559 }
560
561 if (acpi_irq_balance || !link->irq.active) {
562 /*
563 * Select the best IRQ. This is done in reverse to promote
564 * the use of IRQs 9, 10, 11, and >15.
565 */
566 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
567 if (acpi_irq_penalty[irq] >
568 acpi_irq_penalty[link->irq.possible[i]])
569 irq = link->irq.possible[i];
570 }
571 }
572
573 /* Attempt to enable the link device at this IRQ. */
574 if (acpi_pci_link_set(link, irq)) {
575 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
576 "Try pci=noacpi or acpi=off\n",
577 acpi_device_name(link->device),
578 acpi_device_bid(link->device));
579 return -ENODEV;
580 } else {
581 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
582 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
583 acpi_device_name(link->device),
584 acpi_device_bid(link->device), link->irq.active);
585 }
586
587 link->irq.initialized = 1;
588
589 return 0;
590 }
591
592 /*
593 * acpi_pci_link_allocate_irq
594 * success: return IRQ >= 0
595 * failure: return -1
596 */
597
598 int
599 acpi_pci_link_allocate_irq(acpi_handle handle,
600 int index,
601 int *triggering, int *polarity, char **name)
602 {
603 int result = 0;
604 struct acpi_device *device = NULL;
605 struct acpi_pci_link *link = NULL;
606
607
608 result = acpi_bus_get_device(handle, &device);
609 if (result) {
610 printk(KERN_ERR PREFIX "Invalid link device\n");
611 return -1;
612 }
613
614 link = acpi_driver_data(device);
615 if (!link) {
616 printk(KERN_ERR PREFIX "Invalid link context\n");
617 return -1;
618 }
619
620 /* TBD: Support multiple index (IRQ) entries per Link Device */
621 if (index) {
622 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
623 return -1;
624 }
625
626 mutex_lock(&acpi_link_lock);
627 if (acpi_pci_link_allocate(link)) {
628 mutex_unlock(&acpi_link_lock);
629 return -1;
630 }
631
632 if (!link->irq.active) {
633 mutex_unlock(&acpi_link_lock);
634 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
635 return -1;
636 }
637 link->refcnt++;
638 mutex_unlock(&acpi_link_lock);
639
640 if (triggering)
641 *triggering = link->irq.triggering;
642 if (polarity)
643 *polarity = link->irq.polarity;
644 if (name)
645 *name = acpi_device_bid(link->device);
646 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
647 "Link %s is referenced\n",
648 acpi_device_bid(link->device)));
649 return (link->irq.active);
650 }
651
652 /*
653 * We don't change link's irq information here. After it is reenabled, we
654 * continue use the info
655 */
656 int acpi_pci_link_free_irq(acpi_handle handle)
657 {
658 struct acpi_device *device = NULL;
659 struct acpi_pci_link *link = NULL;
660 acpi_status result;
661
662
663 result = acpi_bus_get_device(handle, &device);
664 if (result) {
665 printk(KERN_ERR PREFIX "Invalid link device\n");
666 return -1;
667 }
668
669 link = acpi_driver_data(device);
670 if (!link) {
671 printk(KERN_ERR PREFIX "Invalid link context\n");
672 return -1;
673 }
674
675 mutex_lock(&acpi_link_lock);
676 if (!link->irq.initialized) {
677 mutex_unlock(&acpi_link_lock);
678 printk(KERN_ERR PREFIX "Link isn't initialized\n");
679 return -1;
680 }
681 #ifdef FUTURE_USE
682 /*
683 * The Link reference count allows us to _DISable an unused link
684 * and suspend time, and set it again on resume.
685 * However, 2.6.12 still has irq_router.resume
686 * which blindly restores the link state.
687 * So we disable the reference count method
688 * to prevent duplicate acpi_pci_link_set()
689 * which would harm some systems
690 */
691 link->refcnt--;
692 #endif
693 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
694 "Link %s is dereferenced\n",
695 acpi_device_bid(link->device)));
696
697 if (link->refcnt == 0) {
698 acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
699 }
700 mutex_unlock(&acpi_link_lock);
701 return (link->irq.active);
702 }
703
704 /* --------------------------------------------------------------------------
705 Driver Interface
706 -------------------------------------------------------------------------- */
707
708 static int acpi_pci_link_add(struct acpi_device *device)
709 {
710 int result = 0;
711 struct acpi_pci_link *link = NULL;
712 int i = 0;
713 int found = 0;
714
715
716 if (!device)
717 return -EINVAL;
718
719 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
720 if (!link)
721 return -ENOMEM;
722
723 link->device = device;
724 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
725 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
726 acpi_driver_data(device) = link;
727
728 mutex_lock(&acpi_link_lock);
729 result = acpi_pci_link_get_possible(link);
730 if (result)
731 goto end;
732
733 /* query and set link->irq.active */
734 acpi_pci_link_get_current(link);
735
736 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
737 acpi_device_bid(device));
738 for (i = 0; i < link->irq.possible_count; i++) {
739 if (link->irq.active == link->irq.possible[i]) {
740 printk(" *%d", link->irq.possible[i]);
741 found = 1;
742 } else
743 printk(" %d", link->irq.possible[i]);
744 }
745
746 printk(")");
747
748 if (!found)
749 printk(" *%d", link->irq.active);
750
751 if (!link->device->status.enabled)
752 printk(", disabled.");
753
754 printk("\n");
755
756 /* TBD: Acquire/release lock */
757 list_add_tail(&link->node, &acpi_link.entries);
758 acpi_link.count++;
759
760 end:
761 /* disable all links -- to be activated on use */
762 acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
763 mutex_unlock(&acpi_link_lock);
764
765 if (result)
766 kfree(link);
767
768 return result;
769 }
770
771 static int acpi_pci_link_resume(struct acpi_pci_link *link)
772 {
773
774 if (link->refcnt && link->irq.active && link->irq.initialized)
775 return (acpi_pci_link_set(link, link->irq.active));
776 else
777 return 0;
778 }
779
780 static int irqrouter_resume(struct sys_device *dev)
781 {
782 struct list_head *node = NULL;
783 struct acpi_pci_link *link = NULL;
784
785
786 /* Make sure SCI is enabled again (Apple firmware bug?) */
787 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
788
789 list_for_each(node, &acpi_link.entries) {
790 link = list_entry(node, struct acpi_pci_link, node);
791 if (!link) {
792 printk(KERN_ERR PREFIX "Invalid link context\n");
793 continue;
794 }
795 acpi_pci_link_resume(link);
796 }
797 return 0;
798 }
799
800 static int acpi_pci_link_remove(struct acpi_device *device, int type)
801 {
802 struct acpi_pci_link *link = NULL;
803
804
805 if (!device || !acpi_driver_data(device))
806 return -EINVAL;
807
808 link = acpi_driver_data(device);
809
810 mutex_lock(&acpi_link_lock);
811 list_del(&link->node);
812 mutex_unlock(&acpi_link_lock);
813
814 kfree(link);
815
816 return 0;
817 }
818
819 /*
820 * modify acpi_irq_penalty[] from cmdline
821 */
822 static int __init acpi_irq_penalty_update(char *str, int used)
823 {
824 int i;
825
826 for (i = 0; i < 16; i++) {
827 int retval;
828 int irq;
829
830 retval = get_option(&str, &irq);
831
832 if (!retval)
833 break; /* no number found */
834
835 if (irq < 0)
836 continue;
837
838 if (irq >= ACPI_MAX_IRQS)
839 continue;
840
841 if (used)
842 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
843 else
844 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
845
846 if (retval != 2) /* no next number */
847 break;
848 }
849 return 1;
850 }
851
852 /*
853 * We'd like PNP to call this routine for the
854 * single ISA_USED value for each legacy device.
855 * But instead it calls us with each POSSIBLE setting.
856 * There is no ISA_POSSIBLE weight, so we simply use
857 * the (small) PCI_USING penalty.
858 */
859 void acpi_penalize_isa_irq(int irq, int active)
860 {
861 if (active)
862 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
863 else
864 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
865 }
866
867 /*
868 * Over-ride default table to reserve additional IRQs for use by ISA
869 * e.g. acpi_irq_isa=5
870 * Useful for telling ACPI how not to interfere with your ISA sound card.
871 */
872 static int __init acpi_irq_isa(char *str)
873 {
874 return acpi_irq_penalty_update(str, 1);
875 }
876
877 __setup("acpi_irq_isa=", acpi_irq_isa);
878
879 /*
880 * Over-ride default table to free additional IRQs for use by PCI
881 * e.g. acpi_irq_pci=7,15
882 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
883 */
884 static int __init acpi_irq_pci(char *str)
885 {
886 return acpi_irq_penalty_update(str, 0);
887 }
888
889 __setup("acpi_irq_pci=", acpi_irq_pci);
890
891 static int __init acpi_irq_nobalance_set(char *str)
892 {
893 acpi_irq_balance = 0;
894 return 1;
895 }
896
897 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
898
899 int __init acpi_irq_balance_set(char *str)
900 {
901 acpi_irq_balance = 1;
902 return 1;
903 }
904
905 __setup("acpi_irq_balance", acpi_irq_balance_set);
906
907 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
908 static struct sysdev_class irqrouter_sysdev_class = {
909 set_kset_name("irqrouter"),
910 .resume = irqrouter_resume,
911 };
912
913 static struct sys_device device_irqrouter = {
914 .id = 0,
915 .cls = &irqrouter_sysdev_class,
916 };
917
918 static int __init irqrouter_init_sysfs(void)
919 {
920 int error;
921
922
923 if (acpi_disabled || acpi_noirq)
924 return 0;
925
926 error = sysdev_class_register(&irqrouter_sysdev_class);
927 if (!error)
928 error = sysdev_register(&device_irqrouter);
929
930 return error;
931 }
932
933 device_initcall(irqrouter_init_sysfs);
934
935 static int __init acpi_pci_link_init(void)
936 {
937
938 if (acpi_noirq)
939 return 0;
940
941 acpi_link.count = 0;
942 INIT_LIST_HEAD(&acpi_link.entries);
943
944 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
945 return -ENODEV;
946
947 return 0;
948 }
949
950 subsys_initcall(acpi_pci_link_init);
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