2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 * 1. Support more than one IRQ resource entry per link device (index).
24 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
25 * for IRQ management (e.g. start()->_SRS).
28 #include <linux/syscore_ops.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/spinlock.h>
35 #include <linux/pci.h>
36 #include <linux/mutex.h>
37 #include <linux/slab.h>
38 #include <linux/acpi.h>
39 #include <linux/irq.h>
43 #define _COMPONENT ACPI_PCI_COMPONENT
44 ACPI_MODULE_NAME("pci_link");
45 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
46 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
47 #define ACPI_PCI_LINK_FILE_INFO "info"
48 #define ACPI_PCI_LINK_FILE_STATUS "state"
49 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
51 static int acpi_pci_link_add(struct acpi_device
*device
,
52 const struct acpi_device_id
*not_used
);
53 static void acpi_pci_link_remove(struct acpi_device
*device
);
55 static const struct acpi_device_id link_device_ids
[] = {
60 static struct acpi_scan_handler pci_link_handler
= {
61 .ids
= link_device_ids
,
62 .attach
= acpi_pci_link_add
,
63 .detach
= acpi_pci_link_remove
,
67 * If a link is initialized, we never change its active and initialized
68 * later even the link is disable. Instead, we just repick the active irq
70 struct acpi_pci_link_irq
{
71 u32 active
; /* Current IRQ */
72 u8 triggering
; /* All IRQs */
73 u8 polarity
; /* All IRQs */
76 u32 possible
[ACPI_PCI_LINK_MAX_POSSIBLE
];
81 struct acpi_pci_link
{
82 struct list_head list
;
83 struct acpi_device
*device
;
84 struct acpi_pci_link_irq irq
;
88 static LIST_HEAD(acpi_link_list
);
89 static DEFINE_MUTEX(acpi_link_lock
);
91 /* --------------------------------------------------------------------------
92 PCI Link Device Management
93 -------------------------------------------------------------------------- */
96 * set context (link) possible list from resource list
98 static acpi_status
acpi_pci_link_check_possible(struct acpi_resource
*resource
,
101 struct acpi_pci_link
*link
= context
;
104 switch (resource
->type
) {
105 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
106 case ACPI_RESOURCE_TYPE_END_TAG
:
108 case ACPI_RESOURCE_TYPE_IRQ
:
110 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
111 if (!p
|| !p
->interrupt_count
) {
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
113 "Blank _PRS IRQ resource\n"));
117 (i
< p
->interrupt_count
118 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
119 if (!p
->interrupts
[i
]) {
120 printk(KERN_WARNING PREFIX
121 "Invalid _PRS IRQ %d\n",
125 link
->irq
.possible
[i
] = p
->interrupts
[i
];
126 link
->irq
.possible_count
++;
128 link
->irq
.triggering
= p
->triggering
;
129 link
->irq
.polarity
= p
->polarity
;
130 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_IRQ
;
133 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
135 struct acpi_resource_extended_irq
*p
=
136 &resource
->data
.extended_irq
;
137 if (!p
|| !p
->interrupt_count
) {
138 printk(KERN_WARNING PREFIX
139 "Blank _PRS EXT IRQ resource\n");
143 (i
< p
->interrupt_count
144 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
145 if (!p
->interrupts
[i
]) {
146 printk(KERN_WARNING PREFIX
147 "Invalid _PRS IRQ %d\n",
151 link
->irq
.possible
[i
] = p
->interrupts
[i
];
152 link
->irq
.possible_count
++;
154 link
->irq
.triggering
= p
->triggering
;
155 link
->irq
.polarity
= p
->polarity
;
156 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
160 printk(KERN_ERR PREFIX
"_PRS resource type 0x%x isn't an IRQ\n",
165 return AE_CTRL_TERMINATE
;
168 static int acpi_pci_link_get_possible(struct acpi_pci_link
*link
)
172 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__PRS
,
173 acpi_pci_link_check_possible
, link
);
174 if (ACPI_FAILURE(status
)) {
175 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRS"));
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
180 "Found %d possible IRQs\n",
181 link
->irq
.possible_count
));
186 static acpi_status
acpi_pci_link_check_current(struct acpi_resource
*resource
,
191 switch (resource
->type
) {
192 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
193 case ACPI_RESOURCE_TYPE_END_TAG
:
195 case ACPI_RESOURCE_TYPE_IRQ
:
197 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
198 if (!p
|| !p
->interrupt_count
) {
200 * IRQ descriptors may have no IRQ# bits set,
201 * particularly those those w/ _STA disabled
203 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
204 "Blank _CRS IRQ resource\n"));
207 *irq
= p
->interrupts
[0];
210 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
212 struct acpi_resource_extended_irq
*p
=
213 &resource
->data
.extended_irq
;
214 if (!p
|| !p
->interrupt_count
) {
216 * extended IRQ descriptors must
217 * return at least 1 IRQ
219 printk(KERN_WARNING PREFIX
220 "Blank _CRS EXT IRQ resource\n");
223 *irq
= p
->interrupts
[0];
228 printk(KERN_ERR PREFIX
"_CRS resource type 0x%x isn't an IRQ\n",
233 return AE_CTRL_TERMINATE
;
237 * Run _CRS and set link->irq.active
243 static int acpi_pci_link_get_current(struct acpi_pci_link
*link
)
249 link
->irq
.active
= 0;
251 /* in practice, status disabled is meaningless, ignore it */
253 /* Query _STA, set link->device->status */
254 result
= acpi_bus_get_status(link
->device
);
256 printk(KERN_ERR PREFIX
"Unable to read status\n");
260 if (!link
->device
->status
.enabled
) {
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link disabled\n"));
267 * Query and parse _CRS to get the current IRQ assignment.
270 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__CRS
,
271 acpi_pci_link_check_current
, &irq
);
272 if (ACPI_FAILURE(status
)) {
273 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _CRS"));
278 if (acpi_strict
&& !irq
) {
279 printk(KERN_ERR PREFIX
"_CRS returned 0\n");
283 link
->irq
.active
= irq
;
285 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link at IRQ %d \n", link
->irq
.active
));
291 static int acpi_pci_link_set(struct acpi_pci_link
*link
, int irq
)
296 struct acpi_resource res
;
297 struct acpi_resource end
;
299 struct acpi_buffer buffer
= { 0, NULL
};
304 resource
= kzalloc(sizeof(*resource
) + 1, irqs_disabled() ? GFP_ATOMIC
: GFP_KERNEL
);
308 buffer
.length
= sizeof(*resource
) + 1;
309 buffer
.pointer
= resource
;
311 switch (link
->irq
.resource_type
) {
312 case ACPI_RESOURCE_TYPE_IRQ
:
313 resource
->res
.type
= ACPI_RESOURCE_TYPE_IRQ
;
314 resource
->res
.length
= sizeof(struct acpi_resource
);
315 resource
->res
.data
.irq
.triggering
= link
->irq
.triggering
;
316 resource
->res
.data
.irq
.polarity
=
318 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
319 resource
->res
.data
.irq
.sharable
=
322 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
323 resource
->res
.data
.irq
.interrupt_count
= 1;
324 resource
->res
.data
.irq
.interrupts
[0] = irq
;
327 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
328 resource
->res
.type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
329 resource
->res
.length
= sizeof(struct acpi_resource
);
330 resource
->res
.data
.extended_irq
.producer_consumer
=
332 resource
->res
.data
.extended_irq
.triggering
=
333 link
->irq
.triggering
;
334 resource
->res
.data
.extended_irq
.polarity
=
336 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
337 resource
->res
.data
.irq
.sharable
=
340 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
341 resource
->res
.data
.extended_irq
.interrupt_count
= 1;
342 resource
->res
.data
.extended_irq
.interrupts
[0] = irq
;
343 /* ignore resource_source, it's optional */
346 printk(KERN_ERR PREFIX
"Invalid Resource_type %d\n", link
->irq
.resource_type
);
351 resource
->end
.type
= ACPI_RESOURCE_TYPE_END_TAG
;
352 resource
->end
.length
= sizeof(struct acpi_resource
);
354 /* Attempt to set the resource */
355 status
= acpi_set_current_resources(link
->device
->handle
, &buffer
);
357 /* check for total failure */
358 if (ACPI_FAILURE(status
)) {
359 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _SRS"));
364 /* Query _STA, set device->status */
365 result
= acpi_bus_get_status(link
->device
);
367 printk(KERN_ERR PREFIX
"Unable to read status\n");
370 if (!link
->device
->status
.enabled
) {
371 printk(KERN_WARNING PREFIX
372 "%s [%s] disabled and referenced, BIOS bug\n",
373 acpi_device_name(link
->device
),
374 acpi_device_bid(link
->device
));
377 /* Query _CRS, set link->irq.active */
378 result
= acpi_pci_link_get_current(link
);
384 * Is current setting not what we set?
385 * set link->irq.active
387 if (link
->irq
.active
!= irq
) {
389 * policy: when _CRS doesn't return what we just _SRS
390 * assume _SRS worked and override _CRS value.
392 printk(KERN_WARNING PREFIX
393 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
394 acpi_device_name(link
->device
),
395 acpi_device_bid(link
->device
), link
->irq
.active
, irq
);
396 link
->irq
.active
= irq
;
399 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Set IRQ %d\n", link
->irq
.active
));
406 /* --------------------------------------------------------------------------
407 PCI Link IRQ Management
408 -------------------------------------------------------------------------- */
411 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
412 * Link Devices to move the PIRQs around to minimize sharing.
414 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
415 * that the BIOS has already set to active. This is necessary because
416 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
417 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
418 * even if acpi_irq_nobalance is set.
420 * A tables of penalties avoids directing PCI interrupts to well known
421 * ISA IRQs. Boot params are available to over-ride the default table:
423 * List interrupts that are free for PCI use.
426 * List interrupts that should not be used for PCI:
429 * Note that PCI IRQ routers have a list of possible IRQs,
430 * which may not include the IRQs this table says are available.
432 * Since this heuristic can't tell the difference between a link
433 * that no device will attach to, vs. a link which may be shared
434 * by multiple active devices -- it is not optimal.
436 * If interrupt performance is that important, get an IO-APIC system
437 * with a pin dedicated to each device. Or for that matter, an MSI
441 #define ACPI_MAX_IRQS 256
442 #define ACPI_MAX_ISA_IRQ 16
444 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
445 #define PIRQ_PENALTY_PCI_USING (16*16*16)
446 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
447 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
448 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
450 static int acpi_irq_penalty
[ACPI_MAX_IRQS
] = {
451 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ0 timer */
452 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ1 keyboard */
453 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ2 cascade */
454 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ3 serial */
455 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ4 serial */
456 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ5 sometimes SoundBlaster */
457 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ6 */
458 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ7 parallel, spurious */
459 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ8 rtc, sometimes */
460 0, /* IRQ9 PCI, often acpi */
463 PIRQ_PENALTY_ISA_USED
, /* IRQ12 mouse */
464 PIRQ_PENALTY_ISA_USED
, /* IRQ13 fpe, sometimes */
465 PIRQ_PENALTY_ISA_USED
, /* IRQ14 ide0 */
466 PIRQ_PENALTY_ISA_USED
, /* IRQ15 ide1 */
470 static int acpi_irq_pci_sharing_penalty(int irq
)
472 struct acpi_pci_link
*link
;
475 list_for_each_entry(link
, &acpi_link_list
, list
) {
477 * If a link is active, penalize its IRQ heavily
478 * so we try to choose a different IRQ.
480 if (link
->irq
.active
&& link
->irq
.active
== irq
)
481 penalty
+= PIRQ_PENALTY_PCI_USING
;
486 * If a link is inactive, penalize the IRQs it
487 * might use, but not as severely.
489 for (i
= 0; i
< link
->irq
.possible_count
; i
++)
490 if (link
->irq
.possible
[i
] == irq
)
491 penalty
+= PIRQ_PENALTY_PCI_POSSIBLE
/
492 link
->irq
.possible_count
;
499 static int acpi_irq_get_penalty(int irq
)
503 if (irq
< ACPI_MAX_ISA_IRQ
)
504 penalty
+= acpi_irq_penalty
[irq
];
507 * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict
508 * with PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be
511 if (irq
== acpi_gbl_FADT
.sci_interrupt
) {
512 u32 type
= irq_get_trigger_type(irq
) & IRQ_TYPE_SENSE_MASK
;
514 if (type
!= IRQ_TYPE_LEVEL_LOW
)
515 penalty
+= PIRQ_PENALTY_ISA_ALWAYS
;
517 penalty
+= PIRQ_PENALTY_PCI_USING
;
520 penalty
+= acpi_irq_pci_sharing_penalty(irq
);
524 int __init
acpi_irq_penalty_init(void)
526 struct acpi_pci_link
*link
;
530 * Update penalties to facilitate IRQ balancing.
532 list_for_each_entry(link
, &acpi_link_list
, list
) {
535 * reflect the possible and active irqs in the penalty table --
536 * useful for breaking ties.
538 if (link
->irq
.possible_count
) {
540 PIRQ_PENALTY_PCI_POSSIBLE
/
541 link
->irq
.possible_count
;
543 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
544 if (link
->irq
.possible
[i
] < ACPI_MAX_ISA_IRQ
)
545 acpi_irq_penalty
[link
->irq
.
550 } else if (link
->irq
.active
) {
551 acpi_irq_penalty
[link
->irq
.active
] +=
552 PIRQ_PENALTY_PCI_POSSIBLE
;
559 static int acpi_irq_balance
= -1; /* 0: static, 1: balance */
561 static int acpi_pci_link_allocate(struct acpi_pci_link
*link
)
566 if (link
->irq
.initialized
) {
567 if (link
->refcnt
== 0)
568 /* This means the link is disabled but initialized */
569 acpi_pci_link_set(link
, link
->irq
.active
);
574 * search for active IRQ in list of possible IRQs.
576 for (i
= 0; i
< link
->irq
.possible_count
; ++i
) {
577 if (link
->irq
.active
== link
->irq
.possible
[i
])
581 * forget active IRQ that is not in possible list
583 if (i
== link
->irq
.possible_count
) {
585 printk(KERN_WARNING PREFIX
"_CRS %d not found"
586 " in _PRS\n", link
->irq
.active
);
587 link
->irq
.active
= 0;
591 * if active found, use it; else pick entry from end of possible list.
593 if (link
->irq
.active
)
594 irq
= link
->irq
.active
;
596 irq
= link
->irq
.possible
[link
->irq
.possible_count
- 1];
598 if (acpi_irq_balance
|| !link
->irq
.active
) {
600 * Select the best IRQ. This is done in reverse to promote
601 * the use of IRQs 9, 10, 11, and >15.
603 for (i
= (link
->irq
.possible_count
- 1); i
>= 0; i
--) {
604 if (acpi_irq_get_penalty(irq
) >
605 acpi_irq_get_penalty(link
->irq
.possible
[i
]))
606 irq
= link
->irq
.possible
[i
];
609 if (acpi_irq_get_penalty(irq
) >= PIRQ_PENALTY_ISA_ALWAYS
) {
610 printk(KERN_ERR PREFIX
"No IRQ available for %s [%s]. "
611 "Try pci=noacpi or acpi=off\n",
612 acpi_device_name(link
->device
),
613 acpi_device_bid(link
->device
));
617 /* Attempt to enable the link device at this IRQ. */
618 if (acpi_pci_link_set(link
, irq
)) {
619 printk(KERN_ERR PREFIX
"Unable to set IRQ for %s [%s]. "
620 "Try pci=noacpi or acpi=off\n",
621 acpi_device_name(link
->device
),
622 acpi_device_bid(link
->device
));
625 printk(KERN_WARNING PREFIX
"%s [%s] enabled at IRQ %d\n",
626 acpi_device_name(link
->device
),
627 acpi_device_bid(link
->device
), link
->irq
.active
);
630 link
->irq
.initialized
= 1;
635 * acpi_pci_link_allocate_irq
636 * success: return IRQ >= 0
639 int acpi_pci_link_allocate_irq(acpi_handle handle
, int index
, int *triggering
,
640 int *polarity
, char **name
)
643 struct acpi_device
*device
;
644 struct acpi_pci_link
*link
;
646 result
= acpi_bus_get_device(handle
, &device
);
648 printk(KERN_ERR PREFIX
"Invalid link device\n");
652 link
= acpi_driver_data(device
);
654 printk(KERN_ERR PREFIX
"Invalid link context\n");
658 /* TBD: Support multiple index (IRQ) entries per Link Device */
660 printk(KERN_ERR PREFIX
"Invalid index %d\n", index
);
664 mutex_lock(&acpi_link_lock
);
665 if (acpi_pci_link_allocate(link
)) {
666 mutex_unlock(&acpi_link_lock
);
670 if (!link
->irq
.active
) {
671 mutex_unlock(&acpi_link_lock
);
672 printk(KERN_ERR PREFIX
"Link active IRQ is 0!\n");
676 mutex_unlock(&acpi_link_lock
);
679 *triggering
= link
->irq
.triggering
;
681 *polarity
= link
->irq
.polarity
;
683 *name
= acpi_device_bid(link
->device
);
684 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
685 "Link %s is referenced\n",
686 acpi_device_bid(link
->device
)));
687 return (link
->irq
.active
);
691 * We don't change link's irq information here. After it is reenabled, we
692 * continue use the info
694 int acpi_pci_link_free_irq(acpi_handle handle
)
696 struct acpi_device
*device
;
697 struct acpi_pci_link
*link
;
700 result
= acpi_bus_get_device(handle
, &device
);
702 printk(KERN_ERR PREFIX
"Invalid link device\n");
706 link
= acpi_driver_data(device
);
708 printk(KERN_ERR PREFIX
"Invalid link context\n");
712 mutex_lock(&acpi_link_lock
);
713 if (!link
->irq
.initialized
) {
714 mutex_unlock(&acpi_link_lock
);
715 printk(KERN_ERR PREFIX
"Link isn't initialized\n");
720 * The Link reference count allows us to _DISable an unused link
721 * and suspend time, and set it again on resume.
722 * However, 2.6.12 still has irq_router.resume
723 * which blindly restores the link state.
724 * So we disable the reference count method
725 * to prevent duplicate acpi_pci_link_set()
726 * which would harm some systems
730 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
731 "Link %s is dereferenced\n",
732 acpi_device_bid(link
->device
)));
734 if (link
->refcnt
== 0)
735 acpi_evaluate_object(link
->device
->handle
, "_DIS", NULL
, NULL
);
737 mutex_unlock(&acpi_link_lock
);
738 return (link
->irq
.active
);
741 /* --------------------------------------------------------------------------
743 -------------------------------------------------------------------------- */
745 static int acpi_pci_link_add(struct acpi_device
*device
,
746 const struct acpi_device_id
*not_used
)
749 struct acpi_pci_link
*link
;
753 link
= kzalloc(sizeof(struct acpi_pci_link
), GFP_KERNEL
);
757 link
->device
= device
;
758 strcpy(acpi_device_name(device
), ACPI_PCI_LINK_DEVICE_NAME
);
759 strcpy(acpi_device_class(device
), ACPI_PCI_LINK_CLASS
);
760 device
->driver_data
= link
;
762 mutex_lock(&acpi_link_lock
);
763 result
= acpi_pci_link_get_possible(link
);
767 /* query and set link->irq.active */
768 acpi_pci_link_get_current(link
);
770 printk(KERN_INFO PREFIX
"%s [%s] (IRQs", acpi_device_name(device
),
771 acpi_device_bid(device
));
772 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
773 if (link
->irq
.active
== link
->irq
.possible
[i
]) {
774 printk(KERN_CONT
" *%d", link
->irq
.possible
[i
]);
777 printk(KERN_CONT
" %d", link
->irq
.possible
[i
]);
780 printk(KERN_CONT
")");
783 printk(KERN_CONT
" *%d", link
->irq
.active
);
785 if (!link
->device
->status
.enabled
)
786 printk(KERN_CONT
", disabled.");
788 printk(KERN_CONT
"\n");
790 list_add_tail(&link
->list
, &acpi_link_list
);
793 /* disable all links -- to be activated on use */
794 acpi_evaluate_object(device
->handle
, "_DIS", NULL
, NULL
);
795 mutex_unlock(&acpi_link_lock
);
800 return result
< 0 ? result
: 1;
803 static int acpi_pci_link_resume(struct acpi_pci_link
*link
)
805 if (link
->refcnt
&& link
->irq
.active
&& link
->irq
.initialized
)
806 return (acpi_pci_link_set(link
, link
->irq
.active
));
811 static void irqrouter_resume(void)
813 struct acpi_pci_link
*link
;
815 list_for_each_entry(link
, &acpi_link_list
, list
) {
816 acpi_pci_link_resume(link
);
820 static void acpi_pci_link_remove(struct acpi_device
*device
)
822 struct acpi_pci_link
*link
;
824 link
= acpi_driver_data(device
);
826 mutex_lock(&acpi_link_lock
);
827 list_del(&link
->list
);
828 mutex_unlock(&acpi_link_lock
);
834 * modify acpi_irq_penalty[] from cmdline
836 static int __init
acpi_irq_penalty_update(char *str
, int used
)
840 for (i
= 0; i
< 16; i
++) {
844 retval
= get_option(&str
, &irq
);
847 break; /* no number found */
852 if (irq
>= ARRAY_SIZE(acpi_irq_penalty
))
856 acpi_irq_penalty
[irq
] = acpi_irq_get_penalty(irq
) +
857 PIRQ_PENALTY_ISA_USED
;
859 acpi_irq_penalty
[irq
] = 0;
861 if (retval
!= 2) /* no next number */
868 * We'd like PNP to call this routine for the
869 * single ISA_USED value for each legacy device.
870 * But instead it calls us with each POSSIBLE setting.
871 * There is no ISA_POSSIBLE weight, so we simply use
872 * the (small) PCI_USING penalty.
874 void acpi_penalize_isa_irq(int irq
, int active
)
876 if (irq
>= 0 && irq
< ARRAY_SIZE(acpi_irq_penalty
))
877 acpi_irq_penalty
[irq
] = acpi_irq_get_penalty(irq
) +
878 active
? PIRQ_PENALTY_ISA_USED
: PIRQ_PENALTY_PCI_USING
;
881 bool acpi_isa_irq_available(int irq
)
883 return irq
>= 0 && (irq
>= ARRAY_SIZE(acpi_irq_penalty
) ||
884 acpi_irq_get_penalty(irq
) < PIRQ_PENALTY_ISA_ALWAYS
);
887 void acpi_penalize_sci_irq(int irq
, int trigger
, int polarity
)
892 * Over-ride default table to reserve additional IRQs for use by ISA
893 * e.g. acpi_irq_isa=5
894 * Useful for telling ACPI how not to interfere with your ISA sound card.
896 static int __init
acpi_irq_isa(char *str
)
898 return acpi_irq_penalty_update(str
, 1);
901 __setup("acpi_irq_isa=", acpi_irq_isa
);
904 * Over-ride default table to free additional IRQs for use by PCI
905 * e.g. acpi_irq_pci=7,15
906 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
908 static int __init
acpi_irq_pci(char *str
)
910 return acpi_irq_penalty_update(str
, 0);
913 __setup("acpi_irq_pci=", acpi_irq_pci
);
915 static int __init
acpi_irq_nobalance_set(char *str
)
917 acpi_irq_balance
= 0;
921 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set
);
923 static int __init
acpi_irq_balance_set(char *str
)
925 acpi_irq_balance
= 1;
929 __setup("acpi_irq_balance", acpi_irq_balance_set
);
931 static struct syscore_ops irqrouter_syscore_ops
= {
932 .resume
= irqrouter_resume
,
935 void __init
acpi_pci_link_init(void)
940 if (acpi_irq_balance
== -1) {
941 /* no command line switch: enable balancing in IOAPIC mode */
942 if (acpi_irq_model
== ACPI_IRQ_MODEL_IOAPIC
)
943 acpi_irq_balance
= 1;
945 acpi_irq_balance
= 0;
947 register_syscore_ops(&irqrouter_syscore_ops
);
948 acpi_scan_add_handler(&pci_link_handler
);