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 * 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.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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).
32 #include <linux/syscore_ops.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/spinlock.h>
39 #include <linux/pci.h>
40 #include <linux/mutex.h>
41 #include <linux/slab.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
46 #define PREFIX "ACPI: "
48 #define _COMPONENT ACPI_PCI_COMPONENT
49 ACPI_MODULE_NAME("pci_link");
50 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
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
56 static int acpi_pci_link_add(struct acpi_device
*device
,
57 const struct acpi_device_id
*not_used
);
58 static void acpi_pci_link_remove(struct acpi_device
*device
);
60 static const struct acpi_device_id link_device_ids
[] = {
65 static struct acpi_scan_handler pci_link_handler
= {
66 .ids
= link_device_ids
,
67 .attach
= acpi_pci_link_add
,
68 .detach
= acpi_pci_link_remove
,
72 * If a link is initialized, we never change its active and initialized
73 * later even the link is disable. Instead, we just repick the active irq
75 struct acpi_pci_link_irq
{
76 u8 active
; /* Current IRQ */
77 u8 triggering
; /* All IRQs */
78 u8 polarity
; /* All IRQs */
81 u8 possible
[ACPI_PCI_LINK_MAX_POSSIBLE
];
86 struct acpi_pci_link
{
87 struct list_head list
;
88 struct acpi_device
*device
;
89 struct acpi_pci_link_irq irq
;
93 static LIST_HEAD(acpi_link_list
);
94 static DEFINE_MUTEX(acpi_link_lock
);
96 /* --------------------------------------------------------------------------
97 PCI Link Device Management
98 -------------------------------------------------------------------------- */
101 * set context (link) possible list from resource list
103 static acpi_status
acpi_pci_link_check_possible(struct acpi_resource
*resource
,
106 struct acpi_pci_link
*link
= context
;
109 switch (resource
->type
) {
110 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
111 case ACPI_RESOURCE_TYPE_END_TAG
:
113 case ACPI_RESOURCE_TYPE_IRQ
:
115 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
116 if (!p
|| !p
->interrupt_count
) {
117 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
118 "Blank _PRS IRQ resource\n"));
122 (i
< p
->interrupt_count
123 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
124 if (!p
->interrupts
[i
]) {
125 printk(KERN_WARNING PREFIX
126 "Invalid _PRS IRQ %d\n",
130 link
->irq
.possible
[i
] = p
->interrupts
[i
];
131 link
->irq
.possible_count
++;
133 link
->irq
.triggering
= p
->triggering
;
134 link
->irq
.polarity
= p
->polarity
;
135 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_IRQ
;
138 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
140 struct acpi_resource_extended_irq
*p
=
141 &resource
->data
.extended_irq
;
142 if (!p
|| !p
->interrupt_count
) {
143 printk(KERN_WARNING PREFIX
144 "Blank _PRS EXT IRQ resource\n");
148 (i
< p
->interrupt_count
149 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
150 if (!p
->interrupts
[i
]) {
151 printk(KERN_WARNING PREFIX
152 "Invalid _PRS IRQ %d\n",
156 link
->irq
.possible
[i
] = p
->interrupts
[i
];
157 link
->irq
.possible_count
++;
159 link
->irq
.triggering
= p
->triggering
;
160 link
->irq
.polarity
= p
->polarity
;
161 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
165 printk(KERN_ERR PREFIX
"_PRS resource type 0x%x isn't an IRQ\n",
170 return AE_CTRL_TERMINATE
;
173 static int acpi_pci_link_get_possible(struct acpi_pci_link
*link
)
177 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__PRS
,
178 acpi_pci_link_check_possible
, link
);
179 if (ACPI_FAILURE(status
)) {
180 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRS"));
184 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
185 "Found %d possible IRQs\n",
186 link
->irq
.possible_count
));
191 static acpi_status
acpi_pci_link_check_current(struct acpi_resource
*resource
,
196 switch (resource
->type
) {
197 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
198 case ACPI_RESOURCE_TYPE_END_TAG
:
200 case ACPI_RESOURCE_TYPE_IRQ
:
202 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
203 if (!p
|| !p
->interrupt_count
) {
205 * IRQ descriptors may have no IRQ# bits set,
206 * particularly those those w/ _STA disabled
208 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
209 "Blank _CRS IRQ resource\n"));
212 *irq
= p
->interrupts
[0];
215 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
217 struct acpi_resource_extended_irq
*p
=
218 &resource
->data
.extended_irq
;
219 if (!p
|| !p
->interrupt_count
) {
221 * extended IRQ descriptors must
222 * return at least 1 IRQ
224 printk(KERN_WARNING PREFIX
225 "Blank _CRS EXT IRQ resource\n");
228 *irq
= p
->interrupts
[0];
233 printk(KERN_ERR PREFIX
"_CRS resource type 0x%x isn't an IRQ\n",
238 return AE_CTRL_TERMINATE
;
242 * Run _CRS and set link->irq.active
248 static int acpi_pci_link_get_current(struct acpi_pci_link
*link
)
254 link
->irq
.active
= 0;
256 /* in practice, status disabled is meaningless, ignore it */
258 /* Query _STA, set link->device->status */
259 result
= acpi_bus_get_status(link
->device
);
261 printk(KERN_ERR PREFIX
"Unable to read status\n");
265 if (!link
->device
->status
.enabled
) {
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link disabled\n"));
272 * Query and parse _CRS to get the current IRQ assignment.
275 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__CRS
,
276 acpi_pci_link_check_current
, &irq
);
277 if (ACPI_FAILURE(status
)) {
278 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _CRS"));
283 if (acpi_strict
&& !irq
) {
284 printk(KERN_ERR PREFIX
"_CRS returned 0\n");
288 link
->irq
.active
= irq
;
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link at IRQ %d \n", link
->irq
.active
));
296 static int acpi_pci_link_set(struct acpi_pci_link
*link
, int irq
)
301 struct acpi_resource res
;
302 struct acpi_resource end
;
304 struct acpi_buffer buffer
= { 0, NULL
};
309 resource
= kzalloc(sizeof(*resource
) + 1, irqs_disabled() ? GFP_ATOMIC
: GFP_KERNEL
);
313 buffer
.length
= sizeof(*resource
) + 1;
314 buffer
.pointer
= resource
;
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
=
323 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
324 resource
->res
.data
.irq
.sharable
=
327 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
328 resource
->res
.data
.irq
.interrupt_count
= 1;
329 resource
->res
.data
.irq
.interrupts
[0] = irq
;
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
=
337 resource
->res
.data
.extended_irq
.triggering
=
338 link
->irq
.triggering
;
339 resource
->res
.data
.extended_irq
.polarity
=
341 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
342 resource
->res
.data
.irq
.sharable
=
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 */
351 printk(KERN_ERR PREFIX
"Invalid Resource_type %d\n", link
->irq
.resource_type
);
356 resource
->end
.type
= ACPI_RESOURCE_TYPE_END_TAG
;
358 /* Attempt to set the resource */
359 status
= acpi_set_current_resources(link
->device
->handle
, &buffer
);
361 /* check for total failure */
362 if (ACPI_FAILURE(status
)) {
363 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _SRS"));
368 /* Query _STA, set device->status */
369 result
= acpi_bus_get_status(link
->device
);
371 printk(KERN_ERR PREFIX
"Unable to read status\n");
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
));
381 /* Query _CRS, set link->irq.active */
382 result
= acpi_pci_link_get_current(link
);
388 * Is current setting not what we set?
389 * set link->irq.active
391 if (link
->irq
.active
!= irq
) {
393 * policy: when _CRS doesn't return what we just _SRS
394 * assume _SRS worked and override _CRS value.
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
;
403 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Set IRQ %d\n", link
->irq
.active
));
410 /* --------------------------------------------------------------------------
411 PCI Link IRQ Management
412 -------------------------------------------------------------------------- */
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.
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.
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:
427 * List interrupts that are free for PCI use.
430 * List interrupts that should not be used for PCI:
433 * Note that PCI IRQ routers have a list of possible IRQs,
434 * which may not include the IRQs this table says are available.
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.
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
445 #define ACPI_MAX_IRQS 256
446 #define ACPI_MAX_ISA_IRQ 16
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)
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 */
475 int __init
acpi_irq_penalty_init(void)
477 struct acpi_pci_link
*link
;
481 * Update penalties to facilitate IRQ balancing.
483 list_for_each_entry(link
, &acpi_link_list
, list
) {
486 * reflect the possible and active irqs in the penalty table --
487 * useful for breaking ties.
489 if (link
->irq
.possible_count
) {
491 PIRQ_PENALTY_PCI_POSSIBLE
/
492 link
->irq
.possible_count
;
494 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
495 if (link
->irq
.possible
[i
] < ACPI_MAX_ISA_IRQ
)
496 acpi_irq_penalty
[link
->irq
.
501 } else if (link
->irq
.active
) {
502 acpi_irq_penalty
[link
->irq
.active
] +=
503 PIRQ_PENALTY_PCI_POSSIBLE
;
506 /* Add a penalty for the SCI */
507 acpi_irq_penalty
[acpi_gbl_FADT
.sci_interrupt
] += PIRQ_PENALTY_PCI_USING
;
511 static int acpi_irq_balance
= -1; /* 0: static, 1: balance */
513 static int acpi_pci_link_allocate(struct acpi_pci_link
*link
)
518 if (link
->irq
.initialized
) {
519 if (link
->refcnt
== 0)
520 /* This means the link is disabled but initialized */
521 acpi_pci_link_set(link
, link
->irq
.active
);
526 * search for active IRQ in list of possible IRQs.
528 for (i
= 0; i
< link
->irq
.possible_count
; ++i
) {
529 if (link
->irq
.active
== link
->irq
.possible
[i
])
533 * forget active IRQ that is not in possible list
535 if (i
== link
->irq
.possible_count
) {
537 printk(KERN_WARNING PREFIX
"_CRS %d not found"
538 " in _PRS\n", link
->irq
.active
);
539 link
->irq
.active
= 0;
543 * if active found, use it; else pick entry from end of possible list.
545 if (link
->irq
.active
)
546 irq
= link
->irq
.active
;
548 irq
= link
->irq
.possible
[link
->irq
.possible_count
- 1];
550 if (acpi_irq_balance
|| !link
->irq
.active
) {
552 * Select the best IRQ. This is done in reverse to promote
553 * the use of IRQs 9, 10, 11, and >15.
555 for (i
= (link
->irq
.possible_count
- 1); i
>= 0; i
--) {
556 if (acpi_irq_penalty
[irq
] >
557 acpi_irq_penalty
[link
->irq
.possible
[i
]])
558 irq
= link
->irq
.possible
[i
];
562 /* Attempt to enable the link device at this IRQ. */
563 if (acpi_pci_link_set(link
, irq
)) {
564 printk(KERN_ERR PREFIX
"Unable to set IRQ for %s [%s]. "
565 "Try pci=noacpi or acpi=off\n",
566 acpi_device_name(link
->device
),
567 acpi_device_bid(link
->device
));
570 acpi_irq_penalty
[link
->irq
.active
] += PIRQ_PENALTY_PCI_USING
;
571 printk(KERN_WARNING PREFIX
"%s [%s] enabled at IRQ %d\n",
572 acpi_device_name(link
->device
),
573 acpi_device_bid(link
->device
), link
->irq
.active
);
576 link
->irq
.initialized
= 1;
581 * acpi_pci_link_allocate_irq
582 * success: return IRQ >= 0
585 int acpi_pci_link_allocate_irq(acpi_handle handle
, int index
, int *triggering
,
586 int *polarity
, char **name
)
589 struct acpi_device
*device
;
590 struct acpi_pci_link
*link
;
592 result
= acpi_bus_get_device(handle
, &device
);
594 printk(KERN_ERR PREFIX
"Invalid link device\n");
598 link
= acpi_driver_data(device
);
600 printk(KERN_ERR PREFIX
"Invalid link context\n");
604 /* TBD: Support multiple index (IRQ) entries per Link Device */
606 printk(KERN_ERR PREFIX
"Invalid index %d\n", index
);
610 mutex_lock(&acpi_link_lock
);
611 if (acpi_pci_link_allocate(link
)) {
612 mutex_unlock(&acpi_link_lock
);
616 if (!link
->irq
.active
) {
617 mutex_unlock(&acpi_link_lock
);
618 printk(KERN_ERR PREFIX
"Link active IRQ is 0!\n");
622 mutex_unlock(&acpi_link_lock
);
625 *triggering
= link
->irq
.triggering
;
627 *polarity
= link
->irq
.polarity
;
629 *name
= acpi_device_bid(link
->device
);
630 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
631 "Link %s is referenced\n",
632 acpi_device_bid(link
->device
)));
633 return (link
->irq
.active
);
637 * We don't change link's irq information here. After it is reenabled, we
638 * continue use the info
640 int acpi_pci_link_free_irq(acpi_handle handle
)
642 struct acpi_device
*device
;
643 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 mutex_lock(&acpi_link_lock
);
659 if (!link
->irq
.initialized
) {
660 mutex_unlock(&acpi_link_lock
);
661 printk(KERN_ERR PREFIX
"Link isn't initialized\n");
666 * The Link reference count allows us to _DISable an unused link
667 * and suspend time, and set it again on resume.
668 * However, 2.6.12 still has irq_router.resume
669 * which blindly restores the link state.
670 * So we disable the reference count method
671 * to prevent duplicate acpi_pci_link_set()
672 * which would harm some systems
676 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
677 "Link %s is dereferenced\n",
678 acpi_device_bid(link
->device
)));
680 if (link
->refcnt
== 0)
681 acpi_evaluate_object(link
->device
->handle
, "_DIS", NULL
, NULL
);
683 mutex_unlock(&acpi_link_lock
);
684 return (link
->irq
.active
);
687 /* --------------------------------------------------------------------------
689 -------------------------------------------------------------------------- */
691 static int acpi_pci_link_add(struct acpi_device
*device
,
692 const struct acpi_device_id
*not_used
)
695 struct acpi_pci_link
*link
;
699 link
= kzalloc(sizeof(struct acpi_pci_link
), GFP_KERNEL
);
703 link
->device
= device
;
704 strcpy(acpi_device_name(device
), ACPI_PCI_LINK_DEVICE_NAME
);
705 strcpy(acpi_device_class(device
), ACPI_PCI_LINK_CLASS
);
706 device
->driver_data
= link
;
708 mutex_lock(&acpi_link_lock
);
709 result
= acpi_pci_link_get_possible(link
);
713 /* query and set link->irq.active */
714 acpi_pci_link_get_current(link
);
716 printk(KERN_INFO PREFIX
"%s [%s] (IRQs", acpi_device_name(device
),
717 acpi_device_bid(device
));
718 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
719 if (link
->irq
.active
== link
->irq
.possible
[i
]) {
720 printk(KERN_CONT
" *%d", link
->irq
.possible
[i
]);
723 printk(KERN_CONT
" %d", link
->irq
.possible
[i
]);
726 printk(KERN_CONT
")");
729 printk(KERN_CONT
" *%d", link
->irq
.active
);
731 if (!link
->device
->status
.enabled
)
732 printk(KERN_CONT
", disabled.");
734 printk(KERN_CONT
"\n");
736 list_add_tail(&link
->list
, &acpi_link_list
);
739 /* disable all links -- to be activated on use */
740 acpi_evaluate_object(device
->handle
, "_DIS", NULL
, NULL
);
741 mutex_unlock(&acpi_link_lock
);
746 return result
< 0 ? result
: 1;
749 static int acpi_pci_link_resume(struct acpi_pci_link
*link
)
751 if (link
->refcnt
&& link
->irq
.active
&& link
->irq
.initialized
)
752 return (acpi_pci_link_set(link
, link
->irq
.active
));
757 static void irqrouter_resume(void)
759 struct acpi_pci_link
*link
;
761 list_for_each_entry(link
, &acpi_link_list
, list
) {
762 acpi_pci_link_resume(link
);
766 static void acpi_pci_link_remove(struct acpi_device
*device
)
768 struct acpi_pci_link
*link
;
770 link
= acpi_driver_data(device
);
772 mutex_lock(&acpi_link_lock
);
773 list_del(&link
->list
);
774 mutex_unlock(&acpi_link_lock
);
780 * modify acpi_irq_penalty[] from cmdline
782 static int __init
acpi_irq_penalty_update(char *str
, int used
)
786 for (i
= 0; i
< 16; i
++) {
790 retval
= get_option(&str
, &irq
);
793 break; /* no number found */
798 if (irq
>= ARRAY_SIZE(acpi_irq_penalty
))
802 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
804 acpi_irq_penalty
[irq
] = PIRQ_PENALTY_PCI_AVAILABLE
;
806 if (retval
!= 2) /* no next number */
813 * We'd like PNP to call this routine for the
814 * single ISA_USED value for each legacy device.
815 * But instead it calls us with each POSSIBLE setting.
816 * There is no ISA_POSSIBLE weight, so we simply use
817 * the (small) PCI_USING penalty.
819 void acpi_penalize_isa_irq(int irq
, int active
)
821 if (irq
>= 0 && irq
< ARRAY_SIZE(acpi_irq_penalty
)) {
823 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
825 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_PCI_USING
;
830 * Over-ride default table to reserve additional IRQs for use by ISA
831 * e.g. acpi_irq_isa=5
832 * Useful for telling ACPI how not to interfere with your ISA sound card.
834 static int __init
acpi_irq_isa(char *str
)
836 return acpi_irq_penalty_update(str
, 1);
839 __setup("acpi_irq_isa=", acpi_irq_isa
);
842 * Over-ride default table to free additional IRQs for use by PCI
843 * e.g. acpi_irq_pci=7,15
844 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
846 static int __init
acpi_irq_pci(char *str
)
848 return acpi_irq_penalty_update(str
, 0);
851 __setup("acpi_irq_pci=", acpi_irq_pci
);
853 static int __init
acpi_irq_nobalance_set(char *str
)
855 acpi_irq_balance
= 0;
859 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set
);
861 static int __init
acpi_irq_balance_set(char *str
)
863 acpi_irq_balance
= 1;
867 __setup("acpi_irq_balance", acpi_irq_balance_set
);
869 static struct syscore_ops irqrouter_syscore_ops
= {
870 .resume
= irqrouter_resume
,
873 void __init
acpi_pci_link_init(void)
878 if (acpi_irq_balance
== -1) {
879 /* no command line switch: enable balancing in IOAPIC mode */
880 if (acpi_irq_model
== ACPI_IRQ_MODEL_IOAPIC
)
881 acpi_irq_balance
= 1;
883 acpi_irq_balance
= 0;
885 register_syscore_ops(&irqrouter_syscore_ops
);
886 acpi_scan_add_handler(&pci_link_handler
);