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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[linux-2.6/kvm.git] / drivers / acpi / pci_link.c
blob228bdb626502a4d1e45872d6269da3b2aa009adb
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_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
51 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
52 #define ACPI_PCI_LINK_FILE_INFO "info"
53 #define ACPI_PCI_LINK_FILE_STATUS "state"
54 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
55 static int acpi_pci_link_add(struct acpi_device *device);
56 static int acpi_pci_link_remove(struct acpi_device *device, int type);
57
58 static struct acpi_driver acpi_pci_link_driver = {
59 .name = ACPI_PCI_LINK_DRIVER_NAME,
60 .class = ACPI_PCI_LINK_CLASS,
61 .ids = ACPI_PCI_LINK_HID,
62 .ops = {
63 .add = acpi_pci_link_add,
64 .remove = acpi_pci_link_remove,
65 },
66 };
67
68 /*
69 * If a link is initialized, we never change its active and initialized
70 * later even the link is disable. Instead, we just repick the active irq
71 */
72 struct acpi_pci_link_irq {
73 u8 active; /* Current IRQ */
74 u8 triggering; /* All IRQs */
75 u8 polarity; /* All IRQs */
76 u8 resource_type;
77 u8 possible_count;
78 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
79 u8 initialized:1;
80 u8 reserved:7;
81 };
82
83 struct acpi_pci_link {
84 struct list_head node;
85 struct acpi_device *device;
86 acpi_handle handle;
87 struct acpi_pci_link_irq irq;
88 int refcnt;
89 };
90
91 static struct {
92 int count;
93 struct list_head entries;
94 } acpi_link;
95 DEFINE_MUTEX(acpi_link_lock);
96
97 /* --------------------------------------------------------------------------
98 PCI Link Device Management
99 -------------------------------------------------------------------------- */
100
101 /*
102 * set context (link) possible list from resource list
103 */
104 static acpi_status
105 acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
106 {
107 struct acpi_pci_link *link = (struct acpi_pci_link *)context;
108 u32 i = 0;
109
110 ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
111
112 switch (resource->type) {
113 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
114 return_ACPI_STATUS(AE_OK);
115 case ACPI_RESOURCE_TYPE_IRQ:
116 {
117 struct acpi_resource_irq *p = &resource->data.irq;
118 if (!p || !p->interrupt_count) {
119 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
120 "Blank IRQ resource\n"));
121 return_ACPI_STATUS(AE_OK);
122 }
123 for (i = 0;
124 (i < p->interrupt_count
125 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
126 if (!p->interrupts[i]) {
127 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
128 "Invalid IRQ %d\n",
129 p->interrupts[i]));
130 continue;
131 }
132 link->irq.possible[i] = p->interrupts[i];
133 link->irq.possible_count++;
134 }
135 link->irq.triggering = p->triggering;
136 link->irq.polarity = p->polarity;
137 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
138 break;
139 }
140 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
141 {
142 struct acpi_resource_extended_irq *p =
143 &resource->data.extended_irq;
144 if (!p || !p->interrupt_count) {
145 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
146 "Blank EXT IRQ resource\n"));
147 return_ACPI_STATUS(AE_OK);
148 }
149 for (i = 0;
150 (i < p->interrupt_count
151 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
152 if (!p->interrupts[i]) {
153 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
154 "Invalid IRQ %d\n",
155 p->interrupts[i]));
156 continue;
157 }
158 link->irq.possible[i] = p->interrupts[i];
159 link->irq.possible_count++;
160 }
161 link->irq.triggering = p->triggering;
162 link->irq.polarity = p->polarity;
163 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
164 break;
165 }
166 default:
167 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
168 "Resource is not an IRQ entry\n"));
169 return_ACPI_STATUS(AE_OK);
170 }
171
172 return_ACPI_STATUS(AE_CTRL_TERMINATE);
173 }
174
175 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
176 {
177 acpi_status status;
178
179 ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
180
181 if (!link)
182 return_VALUE(-EINVAL);
183
184 status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
185 acpi_pci_link_check_possible, link);
186 if (ACPI_FAILURE(status)) {
187 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
188 return_VALUE(-ENODEV);
189 }
190
191 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
192 "Found %d possible IRQs\n",
193 link->irq.possible_count));
194
195 return_VALUE(0);
196 }
197
198 static acpi_status
199 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
200 {
201 int *irq = (int *)context;
202
203 ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
204
205 switch (resource->type) {
206 case ACPI_RESOURCE_TYPE_IRQ:
207 {
208 struct acpi_resource_irq *p = &resource->data.irq;
209 if (!p || !p->interrupt_count) {
210 /*
211 * IRQ descriptors may have no IRQ# bits set,
212 * particularly those those w/ _STA disabled
213 */
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
215 "Blank IRQ resource\n"));
216 return_ACPI_STATUS(AE_OK);
217 }
218 *irq = p->interrupts[0];
219 break;
220 }
221 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
222 {
223 struct acpi_resource_extended_irq *p =
224 &resource->data.extended_irq;
225 if (!p || !p->interrupt_count) {
226 /*
227 * extended IRQ descriptors must
228 * return at least 1 IRQ
229 */
230 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
231 "Blank EXT IRQ resource\n"));
232 return_ACPI_STATUS(AE_OK);
233 }
234 *irq = p->interrupts[0];
235 break;
236 }
237 break;
238 default:
239 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource %d isn't an IRQ\n", resource->type));
240 case ACPI_RESOURCE_TYPE_END_TAG:
241 return_ACPI_STATUS(AE_OK);
242 }
243 return_ACPI_STATUS(AE_CTRL_TERMINATE);
244 }
245
246 /*
247 * Run _CRS and set link->irq.active
248 *
249 * return value:
250 * 0 - success
251 * !0 - failure
252 */
253 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
254 {
255 int result = 0;
256 acpi_status status = AE_OK;
257 int irq = 0;
258
259 ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
260
261 if (!link || !link->handle)
262 return_VALUE(-EINVAL);
263
264 link->irq.active = 0;
265
266 /* in practice, status disabled is meaningless, ignore it */
267 if (acpi_strict) {
268 /* Query _STA, set link->device->status */
269 result = acpi_bus_get_status(link->device);
270 if (result) {
271 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
272 "Unable to read status\n"));
273 goto end;
274 }
275
276 if (!link->device->status.enabled) {
277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
278 return_VALUE(0);
279 }
280 }
281
282 /*
283 * Query and parse _CRS to get the current IRQ assignment.
284 */
285
286 status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
287 acpi_pci_link_check_current, &irq);
288 if (ACPI_FAILURE(status)) {
289 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
290 result = -ENODEV;
291 goto end;
292 }
293
294 if (acpi_strict && !irq) {
295 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
296 result = -ENODEV;
297 }
298
299 link->irq.active = irq;
300
301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
302
303 end:
304 return_VALUE(result);
305 }
306
307 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
308 {
309 int result = 0;
310 acpi_status status = AE_OK;
311 struct {
312 struct acpi_resource res;
313 struct acpi_resource end;
314 } *resource;
315 struct acpi_buffer buffer = { 0, NULL };
316
317 ACPI_FUNCTION_TRACE("acpi_pci_link_set");
318
319 if (!link || !irq)
320 return_VALUE(-EINVAL);
321
322 resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
323 if (!resource)
324 return_VALUE(-ENOMEM);
325
326 memset(resource, 0, sizeof(*resource) + 1);
327 buffer.length = sizeof(*resource) + 1;
328 buffer.pointer = resource;
329
330 switch (link->irq.resource_type) {
331 case ACPI_RESOURCE_TYPE_IRQ:
332 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
333 resource->res.length = sizeof(struct acpi_resource);
334 resource->res.data.irq.triggering = link->irq.triggering;
335 resource->res.data.irq.polarity =
336 link->irq.polarity;
337 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
338 resource->res.data.irq.sharable =
339 ACPI_EXCLUSIVE;
340 else
341 resource->res.data.irq.sharable = ACPI_SHARED;
342 resource->res.data.irq.interrupt_count = 1;
343 resource->res.data.irq.interrupts[0] = irq;
344 break;
345
346 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
347 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
348 resource->res.length = sizeof(struct acpi_resource);
349 resource->res.data.extended_irq.producer_consumer =
350 ACPI_CONSUMER;
351 resource->res.data.extended_irq.triggering =
352 link->irq.triggering;
353 resource->res.data.extended_irq.polarity =
354 link->irq.polarity;
355 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
356 resource->res.data.irq.sharable =
357 ACPI_EXCLUSIVE;
358 else
359 resource->res.data.irq.sharable = ACPI_SHARED;
360 resource->res.data.extended_irq.interrupt_count = 1;
361 resource->res.data.extended_irq.interrupts[0] = irq;
362 /* ignore resource_source, it's optional */
363 break;
364 default:
365 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
366 result = -EINVAL;
367 goto end;
368
369 }
370 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
371
372 /* Attempt to set the resource */
373 status = acpi_set_current_resources(link->handle, &buffer);
374
375 /* check for total failure */
376 if (ACPI_FAILURE(status)) {
377 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
378 result = -ENODEV;
379 goto end;
380 }
381
382 /* Query _STA, set device->status */
383 result = acpi_bus_get_status(link->device);
384 if (result) {
385 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
386 goto end;
387 }
388 if (!link->device->status.enabled) {
389 printk(KERN_WARNING PREFIX
390 "%s [%s] disabled and referenced, BIOS bug.\n",
391 acpi_device_name(link->device),
392 acpi_device_bid(link->device));
393 }
394
395 /* Query _CRS, set link->irq.active */
396 result = acpi_pci_link_get_current(link);
397 if (result) {
398 goto end;
399 }
400
401 /*
402 * Is current setting not what we set?
403 * set link->irq.active
404 */
405 if (link->irq.active != irq) {
406 /*
407 * policy: when _CRS doesn't return what we just _SRS
408 * assume _SRS worked and override _CRS value.
409 */
410 printk(KERN_WARNING PREFIX
411 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
412 acpi_device_name(link->device),
413 acpi_device_bid(link->device), link->irq.active, irq);
414 link->irq.active = irq;
415 }
416
417 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
418
419 end:
420 kfree(resource);
421 return_VALUE(result);
422 }
423
424 /* --------------------------------------------------------------------------
425 PCI Link IRQ Management
426 -------------------------------------------------------------------------- */
427
428 /*
429 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
430 * Link Devices to move the PIRQs around to minimize sharing.
431 *
432 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
433 * that the BIOS has already set to active. This is necessary because
434 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
435 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
436 * even if acpi_irq_nobalance is set.
437 *
438 * A tables of penalties avoids directing PCI interrupts to well known
439 * ISA IRQs. Boot params are available to over-ride the default table:
440 *
441 * List interrupts that are free for PCI use.
442 * acpi_irq_pci=n[,m]
443 *
444 * List interrupts that should not be used for PCI:
445 * acpi_irq_isa=n[,m]
446 *
447 * Note that PCI IRQ routers have a list of possible IRQs,
448 * which may not include the IRQs this table says are available.
449 *
450 * Since this heuristic can't tell the difference between a link
451 * that no device will attach to, vs. a link which may be shared
452 * by multiple active devices -- it is not optimal.
453 *
454 * If interrupt performance is that important, get an IO-APIC system
455 * with a pin dedicated to each device. Or for that matter, an MSI
456 * enabled system.
457 */
458
459 #define ACPI_MAX_IRQS 256
460 #define ACPI_MAX_ISA_IRQ 16
461
462 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
463 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
464 #define PIRQ_PENALTY_PCI_USING (16*16*16)
465 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
466 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
467 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
468
469 static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
470 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
471 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
472 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
473 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
474 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
475 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
476 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
477 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
478 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
479 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
480 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
481 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
482 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
483 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
484 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
485 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
486 /* >IRQ15 */
487 };
488
489 int __init acpi_irq_penalty_init(void)
490 {
491 struct list_head *node = NULL;
492 struct acpi_pci_link *link = NULL;
493 int i = 0;
494
495 ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
496
497 /*
498 * Update penalties to facilitate IRQ balancing.
499 */
500 list_for_each(node, &acpi_link.entries) {
501
502 link = list_entry(node, struct acpi_pci_link, node);
503 if (!link) {
504 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
505 "Invalid link context\n"));
506 continue;
507 }
508
509 /*
510 * reflect the possible and active irqs in the penalty table --
511 * useful for breaking ties.
512 */
513 if (link->irq.possible_count) {
514 int penalty =
515 PIRQ_PENALTY_PCI_POSSIBLE /
516 link->irq.possible_count;
517
518 for (i = 0; i < link->irq.possible_count; i++) {
519 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
520 acpi_irq_penalty[link->irq.
521 possible[i]] +=
522 penalty;
523 }
524
525 } else if (link->irq.active) {
526 acpi_irq_penalty[link->irq.active] +=
527 PIRQ_PENALTY_PCI_POSSIBLE;
528 }
529 }
530 /* Add a penalty for the SCI */
531 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
532
533 return_VALUE(0);
534 }
535
536 static int acpi_irq_balance; /* 0: static, 1: balance */
537
538 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
539 {
540 int irq;
541 int i;
542
543 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
544
545 if (link->irq.initialized) {
546 if (link->refcnt == 0)
547 /* This means the link is disabled but initialized */
548 acpi_pci_link_set(link, link->irq.active);
549 return_VALUE(0);
550 }
551
552 /*
553 * search for active IRQ in list of possible IRQs.
554 */
555 for (i = 0; i < link->irq.possible_count; ++i) {
556 if (link->irq.active == link->irq.possible[i])
557 break;
558 }
559 /*
560 * forget active IRQ that is not in possible list
561 */
562 if (i == link->irq.possible_count) {
563 if (acpi_strict)
564 printk(KERN_WARNING PREFIX "_CRS %d not found"
565 " in _PRS\n", link->irq.active);
566 link->irq.active = 0;
567 }
568
569 /*
570 * if active found, use it; else pick entry from end of possible list.
571 */
572 if (link->irq.active) {
573 irq = link->irq.active;
574 } else {
575 irq = link->irq.possible[link->irq.possible_count - 1];
576 }
577
578 if (acpi_irq_balance || !link->irq.active) {
579 /*
580 * Select the best IRQ. This is done in reverse to promote
581 * the use of IRQs 9, 10, 11, and >15.
582 */
583 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
584 if (acpi_irq_penalty[irq] >
585 acpi_irq_penalty[link->irq.possible[i]])
586 irq = link->irq.possible[i];
587 }
588 }
589
590 /* Attempt to enable the link device at this IRQ. */
591 if (acpi_pci_link_set(link, irq)) {
592 printk(PREFIX
593 "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
594 "Try pci=noacpi or acpi=off\n",
595 acpi_device_name(link->device),
596 acpi_device_bid(link->device));
597 return_VALUE(-ENODEV);
598 } else {
599 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
600 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
601 acpi_device_name(link->device),
602 acpi_device_bid(link->device), link->irq.active);
603 }
604
605 link->irq.initialized = 1;
606
607 return_VALUE(0);
608 }
609
610 /*
611 * acpi_pci_link_allocate_irq
612 * success: return IRQ >= 0
613 * failure: return -1
614 */
615
616 int
617 acpi_pci_link_allocate_irq(acpi_handle handle,
618 int index,
619 int *triggering, int *polarity, char **name)
620 {
621 int result = 0;
622 struct acpi_device *device = NULL;
623 struct acpi_pci_link *link = NULL;
624
625 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
626
627 result = acpi_bus_get_device(handle, &device);
628 if (result) {
629 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
630 return_VALUE(-1);
631 }
632
633 link = (struct acpi_pci_link *)acpi_driver_data(device);
634 if (!link) {
635 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
636 return_VALUE(-1);
637 }
638
639 /* TBD: Support multiple index (IRQ) entries per Link Device */
640 if (index) {
641 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
642 return_VALUE(-1);
643 }
644
645 mutex_lock(&acpi_link_lock);
646 if (acpi_pci_link_allocate(link)) {
647 mutex_unlock(&acpi_link_lock);
648 return_VALUE(-1);
649 }
650
651 if (!link->irq.active) {
652 mutex_unlock(&acpi_link_lock);
653 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
654 return_VALUE(-1);
655 }
656 link->refcnt++;
657 mutex_unlock(&acpi_link_lock);
658
659 if (triggering)
660 *triggering = link->irq.triggering;
661 if (polarity)
662 *polarity = link->irq.polarity;
663 if (name)
664 *name = acpi_device_bid(link->device);
665 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
666 "Link %s is referenced\n",
667 acpi_device_bid(link->device)));
668 return_VALUE(link->irq.active);
669 }
670
671 /*
672 * We don't change link's irq information here. After it is reenabled, we
673 * continue use the info
674 */
675 int acpi_pci_link_free_irq(acpi_handle handle)
676 {
677 struct acpi_device *device = NULL;
678 struct acpi_pci_link *link = NULL;
679 acpi_status result;
680
681 ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
682
683 result = acpi_bus_get_device(handle, &device);
684 if (result) {
685 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
686 return_VALUE(-1);
687 }
688
689 link = (struct acpi_pci_link *)acpi_driver_data(device);
690 if (!link) {
691 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
692 return_VALUE(-1);
693 }
694
695 mutex_lock(&acpi_link_lock);
696 if (!link->irq.initialized) {
697 mutex_unlock(&acpi_link_lock);
698 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n"));
699 return_VALUE(-1);
700 }
701 #ifdef FUTURE_USE
702 /*
703 * The Link reference count allows us to _DISable an unused link
704 * and suspend time, and set it again on resume.
705 * However, 2.6.12 still has irq_router.resume
706 * which blindly restores the link state.
707 * So we disable the reference count method
708 * to prevent duplicate acpi_pci_link_set()
709 * which would harm some systems
710 */
711 link->refcnt--;
712 #endif
713 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
714 "Link %s is dereferenced\n",
715 acpi_device_bid(link->device)));
716
717 if (link->refcnt == 0) {
718 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
719 }
720 mutex_unlock(&acpi_link_lock);
721 return_VALUE(link->irq.active);
722 }
723
724 /* --------------------------------------------------------------------------
725 Driver Interface
726 -------------------------------------------------------------------------- */
727
728 static int acpi_pci_link_add(struct acpi_device *device)
729 {
730 int result = 0;
731 struct acpi_pci_link *link = NULL;
732 int i = 0;
733 int found = 0;
734
735 ACPI_FUNCTION_TRACE("acpi_pci_link_add");
736
737 if (!device)
738 return_VALUE(-EINVAL);
739
740 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
741 if (!link)
742 return_VALUE(-ENOMEM);
743 memset(link, 0, sizeof(struct acpi_pci_link));
744
745 link->device = device;
746 link->handle = device->handle;
747 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
748 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
749 acpi_driver_data(device) = link;
750
751 mutex_lock(&acpi_link_lock);
752 result = acpi_pci_link_get_possible(link);
753 if (result)
754 goto end;
755
756 /* query and set link->irq.active */
757 acpi_pci_link_get_current(link);
758
759 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
760 acpi_device_bid(device));
761 for (i = 0; i < link->irq.possible_count; i++) {
762 if (link->irq.active == link->irq.possible[i]) {
763 printk(" *%d", link->irq.possible[i]);
764 found = 1;
765 } else
766 printk(" %d", link->irq.possible[i]);
767 }
768
769 printk(")");
770
771 if (!found)
772 printk(" *%d", link->irq.active);
773
774 if (!link->device->status.enabled)
775 printk(", disabled.");
776
777 printk("\n");
778
779 /* TBD: Acquire/release lock */
780 list_add_tail(&link->node, &acpi_link.entries);
781 acpi_link.count++;
782
783 end:
784 /* disable all links -- to be activated on use */
785 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
786 mutex_unlock(&acpi_link_lock);
787
788 if (result)
789 kfree(link);
790
791 return_VALUE(result);
792 }
793
794 static int acpi_pci_link_resume(struct acpi_pci_link *link)
795 {
796 ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
797
798 if (link->refcnt && link->irq.active && link->irq.initialized)
799 return_VALUE(acpi_pci_link_set(link, link->irq.active));
800 else
801 return_VALUE(0);
802 }
803
804 /*
805 * FIXME: this is a workaround to avoid nasty warning. It will be removed
806 * after every device calls pci_disable_device in .resume.
807 */
808 int acpi_in_resume;
809 static int irqrouter_resume(struct sys_device *dev)
810 {
811 struct list_head *node = NULL;
812 struct acpi_pci_link *link = NULL;
813
814 ACPI_FUNCTION_TRACE("irqrouter_resume");
815
816 /* Make sure SCI is enabled again (Apple firmware bug?) */
817 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK);
818
819 acpi_in_resume = 1;
820 list_for_each(node, &acpi_link.entries) {
821 link = list_entry(node, struct acpi_pci_link, node);
822 if (!link) {
823 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
824 "Invalid link context\n"));
825 continue;
826 }
827 acpi_pci_link_resume(link);
828 }
829 acpi_in_resume = 0;
830 return_VALUE(0);
831 }
832
833 static int acpi_pci_link_remove(struct acpi_device *device, int type)
834 {
835 struct acpi_pci_link *link = NULL;
836
837 ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
838
839 if (!device || !acpi_driver_data(device))
840 return_VALUE(-EINVAL);
841
842 link = (struct acpi_pci_link *)acpi_driver_data(device);
843
844 mutex_lock(&acpi_link_lock);
845 list_del(&link->node);
846 mutex_unlock(&acpi_link_lock);
847
848 kfree(link);
849
850 return_VALUE(0);
851 }
852
853 /*
854 * modify acpi_irq_penalty[] from cmdline
855 */
856 static int __init acpi_irq_penalty_update(char *str, int used)
857 {
858 int i;
859
860 for (i = 0; i < 16; i++) {
861 int retval;
862 int irq;
863
864 retval = get_option(&str, &irq);
865
866 if (!retval)
867 break; /* no number found */
868
869 if (irq < 0)
870 continue;
871
872 if (irq >= ACPI_MAX_IRQS)
873 continue;
874
875 if (used)
876 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
877 else
878 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
879
880 if (retval != 2) /* no next number */
881 break;
882 }
883 return 1;
884 }
885
886 /*
887 * We'd like PNP to call this routine for the
888 * single ISA_USED value for each legacy device.
889 * But instead it calls us with each POSSIBLE setting.
890 * There is no ISA_POSSIBLE weight, so we simply use
891 * the (small) PCI_USING penalty.
892 */
893 void acpi_penalize_isa_irq(int irq, int active)
894 {
895 if (active)
896 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
897 else
898 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
899 }
900
901 /*
902 * Over-ride default table to reserve additional IRQs for use by ISA
903 * e.g. acpi_irq_isa=5
904 * Useful for telling ACPI how not to interfere with your ISA sound card.
905 */
906 static int __init acpi_irq_isa(char *str)
907 {
908 return acpi_irq_penalty_update(str, 1);
909 }
910
911 __setup("acpi_irq_isa=", acpi_irq_isa);
912
913 /*
914 * Over-ride default table to free additional IRQs for use by PCI
915 * e.g. acpi_irq_pci=7,15
916 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
917 */
918 static int __init acpi_irq_pci(char *str)
919 {
920 return acpi_irq_penalty_update(str, 0);
921 }
922
923 __setup("acpi_irq_pci=", acpi_irq_pci);
924
925 static int __init acpi_irq_nobalance_set(char *str)
926 {
927 acpi_irq_balance = 0;
928 return 1;
929 }
930
931 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
932
933 int __init acpi_irq_balance_set(char *str)
934 {
935 acpi_irq_balance = 1;
936 return 1;
937 }
938
939 __setup("acpi_irq_balance", acpi_irq_balance_set);
940
941 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
942 static struct sysdev_class irqrouter_sysdev_class = {
943 set_kset_name("irqrouter"),
944 .resume = irqrouter_resume,
945 };
946
947 static struct sys_device device_irqrouter = {
948 .id = 0,
949 .cls = &irqrouter_sysdev_class,
950 };
951
952 static int __init irqrouter_init_sysfs(void)
953 {
954 int error;
955
956 ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
957
958 if (acpi_disabled || acpi_noirq)
959 return_VALUE(0);
960
961 error = sysdev_class_register(&irqrouter_sysdev_class);
962 if (!error)
963 error = sysdev_register(&device_irqrouter);
964
965 return_VALUE(error);
966 }
967
968 device_initcall(irqrouter_init_sysfs);
969
970 static int __init acpi_pci_link_init(void)
971 {
972 ACPI_FUNCTION_TRACE("acpi_pci_link_init");
973
974 if (acpi_noirq)
975 return_VALUE(0);
976
977 acpi_link.count = 0;
978 INIT_LIST_HEAD(&acpi_link.entries);
979
980 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
981 return_VALUE(-ENODEV);
982
983 return_VALUE(0);
984 }
985
986 subsys_initcall(acpi_pci_link_init);
kernel-based virtual machine