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>
42 #define _COMPONENT ACPI_PCI_COMPONENT
43 ACPI_MODULE_NAME("pci_link");
44 #define ACPI_PCI_LINK_CLASS "pci_irq_routing"
45 #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
46 #define ACPI_PCI_LINK_FILE_INFO "info"
47 #define ACPI_PCI_LINK_FILE_STATUS "state"
48 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
50 static int acpi_pci_link_add(struct acpi_device
*device
,
51 const struct acpi_device_id
*not_used
);
52 static void acpi_pci_link_remove(struct acpi_device
*device
);
54 static const struct acpi_device_id link_device_ids
[] = {
59 static struct acpi_scan_handler pci_link_handler
= {
60 .ids
= link_device_ids
,
61 .attach
= acpi_pci_link_add
,
62 .detach
= acpi_pci_link_remove
,
66 * If a link is initialized, we never change its active and initialized
67 * later even the link is disable. Instead, we just repick the active irq
69 struct acpi_pci_link_irq
{
70 u8 active
; /* Current IRQ */
71 u8 triggering
; /* All IRQs */
72 u8 polarity
; /* All IRQs */
75 u8 possible
[ACPI_PCI_LINK_MAX_POSSIBLE
];
80 struct acpi_pci_link
{
81 struct list_head list
;
82 struct acpi_device
*device
;
83 struct acpi_pci_link_irq irq
;
87 static LIST_HEAD(acpi_link_list
);
88 static DEFINE_MUTEX(acpi_link_lock
);
90 /* --------------------------------------------------------------------------
91 PCI Link Device Management
92 -------------------------------------------------------------------------- */
95 * set context (link) possible list from resource list
97 static acpi_status
acpi_pci_link_check_possible(struct acpi_resource
*resource
,
100 struct acpi_pci_link
*link
= context
;
103 switch (resource
->type
) {
104 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
105 case ACPI_RESOURCE_TYPE_END_TAG
:
107 case ACPI_RESOURCE_TYPE_IRQ
:
109 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
110 if (!p
|| !p
->interrupt_count
) {
111 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
112 "Blank _PRS IRQ resource\n"));
116 (i
< p
->interrupt_count
117 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
118 if (!p
->interrupts
[i
]) {
119 printk(KERN_WARNING PREFIX
120 "Invalid _PRS IRQ %d\n",
124 link
->irq
.possible
[i
] = p
->interrupts
[i
];
125 link
->irq
.possible_count
++;
127 link
->irq
.triggering
= p
->triggering
;
128 link
->irq
.polarity
= p
->polarity
;
129 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_IRQ
;
132 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
134 struct acpi_resource_extended_irq
*p
=
135 &resource
->data
.extended_irq
;
136 if (!p
|| !p
->interrupt_count
) {
137 printk(KERN_WARNING PREFIX
138 "Blank _PRS EXT IRQ resource\n");
142 (i
< p
->interrupt_count
143 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
144 if (!p
->interrupts
[i
]) {
145 printk(KERN_WARNING PREFIX
146 "Invalid _PRS IRQ %d\n",
150 link
->irq
.possible
[i
] = p
->interrupts
[i
];
151 link
->irq
.possible_count
++;
153 link
->irq
.triggering
= p
->triggering
;
154 link
->irq
.polarity
= p
->polarity
;
155 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
159 printk(KERN_ERR PREFIX
"_PRS resource type 0x%x isn't an IRQ\n",
164 return AE_CTRL_TERMINATE
;
167 static int acpi_pci_link_get_possible(struct acpi_pci_link
*link
)
171 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__PRS
,
172 acpi_pci_link_check_possible
, link
);
173 if (ACPI_FAILURE(status
)) {
174 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRS"));
178 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
179 "Found %d possible IRQs\n",
180 link
->irq
.possible_count
));
185 static acpi_status
acpi_pci_link_check_current(struct acpi_resource
*resource
,
190 switch (resource
->type
) {
191 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
192 case ACPI_RESOURCE_TYPE_END_TAG
:
194 case ACPI_RESOURCE_TYPE_IRQ
:
196 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
197 if (!p
|| !p
->interrupt_count
) {
199 * IRQ descriptors may have no IRQ# bits set,
200 * particularly those those w/ _STA disabled
202 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
203 "Blank _CRS IRQ resource\n"));
206 *irq
= p
->interrupts
[0];
209 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
211 struct acpi_resource_extended_irq
*p
=
212 &resource
->data
.extended_irq
;
213 if (!p
|| !p
->interrupt_count
) {
215 * extended IRQ descriptors must
216 * return at least 1 IRQ
218 printk(KERN_WARNING PREFIX
219 "Blank _CRS EXT IRQ resource\n");
222 *irq
= p
->interrupts
[0];
227 printk(KERN_ERR PREFIX
"_CRS resource type 0x%x isn't an IRQ\n",
232 return AE_CTRL_TERMINATE
;
236 * Run _CRS and set link->irq.active
242 static int acpi_pci_link_get_current(struct acpi_pci_link
*link
)
248 link
->irq
.active
= 0;
250 /* in practice, status disabled is meaningless, ignore it */
252 /* Query _STA, set link->device->status */
253 result
= acpi_bus_get_status(link
->device
);
255 printk(KERN_ERR PREFIX
"Unable to read status\n");
259 if (!link
->device
->status
.enabled
) {
260 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link disabled\n"));
266 * Query and parse _CRS to get the current IRQ assignment.
269 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__CRS
,
270 acpi_pci_link_check_current
, &irq
);
271 if (ACPI_FAILURE(status
)) {
272 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _CRS"));
277 if (acpi_strict
&& !irq
) {
278 printk(KERN_ERR PREFIX
"_CRS returned 0\n");
282 link
->irq
.active
= irq
;
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link at IRQ %d \n", link
->irq
.active
));
290 static int acpi_pci_link_set(struct acpi_pci_link
*link
, int irq
)
295 struct acpi_resource res
;
296 struct acpi_resource end
;
298 struct acpi_buffer buffer
= { 0, NULL
};
303 resource
= kzalloc(sizeof(*resource
) + 1, irqs_disabled() ? GFP_ATOMIC
: GFP_KERNEL
);
307 buffer
.length
= sizeof(*resource
) + 1;
308 buffer
.pointer
= resource
;
310 switch (link
->irq
.resource_type
) {
311 case ACPI_RESOURCE_TYPE_IRQ
:
312 resource
->res
.type
= ACPI_RESOURCE_TYPE_IRQ
;
313 resource
->res
.length
= sizeof(struct acpi_resource
);
314 resource
->res
.data
.irq
.triggering
= link
->irq
.triggering
;
315 resource
->res
.data
.irq
.polarity
=
317 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
318 resource
->res
.data
.irq
.sharable
=
321 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
322 resource
->res
.data
.irq
.interrupt_count
= 1;
323 resource
->res
.data
.irq
.interrupts
[0] = irq
;
326 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
327 resource
->res
.type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
328 resource
->res
.length
= sizeof(struct acpi_resource
);
329 resource
->res
.data
.extended_irq
.producer_consumer
=
331 resource
->res
.data
.extended_irq
.triggering
=
332 link
->irq
.triggering
;
333 resource
->res
.data
.extended_irq
.polarity
=
335 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
336 resource
->res
.data
.irq
.sharable
=
339 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
340 resource
->res
.data
.extended_irq
.interrupt_count
= 1;
341 resource
->res
.data
.extended_irq
.interrupts
[0] = irq
;
342 /* ignore resource_source, it's optional */
345 printk(KERN_ERR PREFIX
"Invalid Resource_type %d\n", link
->irq
.resource_type
);
350 resource
->end
.type
= ACPI_RESOURCE_TYPE_END_TAG
;
351 resource
->end
.length
= sizeof(struct acpi_resource
);
353 /* Attempt to set the resource */
354 status
= acpi_set_current_resources(link
->device
->handle
, &buffer
);
356 /* check for total failure */
357 if (ACPI_FAILURE(status
)) {
358 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _SRS"));
363 /* Query _STA, set device->status */
364 result
= acpi_bus_get_status(link
->device
);
366 printk(KERN_ERR PREFIX
"Unable to read status\n");
369 if (!link
->device
->status
.enabled
) {
370 printk(KERN_WARNING PREFIX
371 "%s [%s] disabled and referenced, BIOS bug\n",
372 acpi_device_name(link
->device
),
373 acpi_device_bid(link
->device
));
376 /* Query _CRS, set link->irq.active */
377 result
= acpi_pci_link_get_current(link
);
383 * Is current setting not what we set?
384 * set link->irq.active
386 if (link
->irq
.active
!= irq
) {
388 * policy: when _CRS doesn't return what we just _SRS
389 * assume _SRS worked and override _CRS value.
391 printk(KERN_WARNING PREFIX
392 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
393 acpi_device_name(link
->device
),
394 acpi_device_bid(link
->device
), link
->irq
.active
, irq
);
395 link
->irq
.active
= irq
;
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Set IRQ %d\n", link
->irq
.active
));
405 /* --------------------------------------------------------------------------
406 PCI Link IRQ Management
407 -------------------------------------------------------------------------- */
410 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
411 * Link Devices to move the PIRQs around to minimize sharing.
413 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
414 * that the BIOS has already set to active. This is necessary because
415 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
416 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
417 * even if acpi_irq_nobalance is set.
419 * A tables of penalties avoids directing PCI interrupts to well known
420 * ISA IRQs. Boot params are available to over-ride the default table:
422 * List interrupts that are free for PCI use.
425 * List interrupts that should not be used for PCI:
428 * Note that PCI IRQ routers have a list of possible IRQs,
429 * which may not include the IRQs this table says are available.
431 * Since this heuristic can't tell the difference between a link
432 * that no device will attach to, vs. a link which may be shared
433 * by multiple active devices -- it is not optimal.
435 * If interrupt performance is that important, get an IO-APIC system
436 * with a pin dedicated to each device. Or for that matter, an MSI
440 #define ACPI_MAX_IRQS 256
441 #define ACPI_MAX_ISA_IRQ 16
443 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
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 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ9 PCI, often acpi */
461 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ10 PCI */
462 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ11 PCI */
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 int __init
acpi_irq_penalty_init(void)
472 struct acpi_pci_link
*link
;
476 * Update penalties to facilitate IRQ balancing.
478 list_for_each_entry(link
, &acpi_link_list
, list
) {
481 * reflect the possible and active irqs in the penalty table --
482 * useful for breaking ties.
484 if (link
->irq
.possible_count
) {
486 PIRQ_PENALTY_PCI_POSSIBLE
/
487 link
->irq
.possible_count
;
489 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
490 if (link
->irq
.possible
[i
] < ACPI_MAX_ISA_IRQ
)
491 acpi_irq_penalty
[link
->irq
.
496 } else if (link
->irq
.active
) {
497 acpi_irq_penalty
[link
->irq
.active
] +=
498 PIRQ_PENALTY_PCI_POSSIBLE
;
501 /* Add a penalty for the SCI */
502 acpi_irq_penalty
[acpi_gbl_FADT
.sci_interrupt
] += PIRQ_PENALTY_PCI_USING
;
506 static int acpi_irq_balance
= -1; /* 0: static, 1: balance */
508 static int acpi_pci_link_allocate(struct acpi_pci_link
*link
)
513 if (link
->irq
.initialized
) {
514 if (link
->refcnt
== 0)
515 /* This means the link is disabled but initialized */
516 acpi_pci_link_set(link
, link
->irq
.active
);
521 * search for active IRQ in list of possible IRQs.
523 for (i
= 0; i
< link
->irq
.possible_count
; ++i
) {
524 if (link
->irq
.active
== link
->irq
.possible
[i
])
528 * forget active IRQ that is not in possible list
530 if (i
== link
->irq
.possible_count
) {
532 printk(KERN_WARNING PREFIX
"_CRS %d not found"
533 " in _PRS\n", link
->irq
.active
);
534 link
->irq
.active
= 0;
538 * if active found, use it; else pick entry from end of possible list.
540 if (link
->irq
.active
)
541 irq
= link
->irq
.active
;
543 irq
= link
->irq
.possible
[link
->irq
.possible_count
- 1];
545 if (acpi_irq_balance
|| !link
->irq
.active
) {
547 * Select the best IRQ. This is done in reverse to promote
548 * the use of IRQs 9, 10, 11, and >15.
550 for (i
= (link
->irq
.possible_count
- 1); i
>= 0; i
--) {
551 if (acpi_irq_penalty
[irq
] >
552 acpi_irq_penalty
[link
->irq
.possible
[i
]])
553 irq
= link
->irq
.possible
[i
];
557 /* Attempt to enable the link device at this IRQ. */
558 if (acpi_pci_link_set(link
, irq
)) {
559 printk(KERN_ERR PREFIX
"Unable to set IRQ for %s [%s]. "
560 "Try pci=noacpi or acpi=off\n",
561 acpi_device_name(link
->device
),
562 acpi_device_bid(link
->device
));
565 acpi_irq_penalty
[link
->irq
.active
] += PIRQ_PENALTY_PCI_USING
;
566 printk(KERN_WARNING PREFIX
"%s [%s] enabled at IRQ %d\n",
567 acpi_device_name(link
->device
),
568 acpi_device_bid(link
->device
), link
->irq
.active
);
571 link
->irq
.initialized
= 1;
576 * acpi_pci_link_allocate_irq
577 * success: return IRQ >= 0
580 int acpi_pci_link_allocate_irq(acpi_handle handle
, int index
, int *triggering
,
581 int *polarity
, char **name
)
584 struct acpi_device
*device
;
585 struct acpi_pci_link
*link
;
587 result
= acpi_bus_get_device(handle
, &device
);
589 printk(KERN_ERR PREFIX
"Invalid link device\n");
593 link
= acpi_driver_data(device
);
595 printk(KERN_ERR PREFIX
"Invalid link context\n");
599 /* TBD: Support multiple index (IRQ) entries per Link Device */
601 printk(KERN_ERR PREFIX
"Invalid index %d\n", index
);
605 mutex_lock(&acpi_link_lock
);
606 if (acpi_pci_link_allocate(link
)) {
607 mutex_unlock(&acpi_link_lock
);
611 if (!link
->irq
.active
) {
612 mutex_unlock(&acpi_link_lock
);
613 printk(KERN_ERR PREFIX
"Link active IRQ is 0!\n");
617 mutex_unlock(&acpi_link_lock
);
620 *triggering
= link
->irq
.triggering
;
622 *polarity
= link
->irq
.polarity
;
624 *name
= acpi_device_bid(link
->device
);
625 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
626 "Link %s is referenced\n",
627 acpi_device_bid(link
->device
)));
628 return (link
->irq
.active
);
632 * We don't change link's irq information here. After it is reenabled, we
633 * continue use the info
635 int acpi_pci_link_free_irq(acpi_handle handle
)
637 struct acpi_device
*device
;
638 struct acpi_pci_link
*link
;
641 result
= acpi_bus_get_device(handle
, &device
);
643 printk(KERN_ERR PREFIX
"Invalid link device\n");
647 link
= acpi_driver_data(device
);
649 printk(KERN_ERR PREFIX
"Invalid link context\n");
653 mutex_lock(&acpi_link_lock
);
654 if (!link
->irq
.initialized
) {
655 mutex_unlock(&acpi_link_lock
);
656 printk(KERN_ERR PREFIX
"Link isn't initialized\n");
661 * The Link reference count allows us to _DISable an unused link
662 * and suspend time, and set it again on resume.
663 * However, 2.6.12 still has irq_router.resume
664 * which blindly restores the link state.
665 * So we disable the reference count method
666 * to prevent duplicate acpi_pci_link_set()
667 * which would harm some systems
671 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
672 "Link %s is dereferenced\n",
673 acpi_device_bid(link
->device
)));
675 if (link
->refcnt
== 0)
676 acpi_evaluate_object(link
->device
->handle
, "_DIS", NULL
, NULL
);
678 mutex_unlock(&acpi_link_lock
);
679 return (link
->irq
.active
);
682 /* --------------------------------------------------------------------------
684 -------------------------------------------------------------------------- */
686 static int acpi_pci_link_add(struct acpi_device
*device
,
687 const struct acpi_device_id
*not_used
)
690 struct acpi_pci_link
*link
;
694 link
= kzalloc(sizeof(struct acpi_pci_link
), GFP_KERNEL
);
698 link
->device
= device
;
699 strcpy(acpi_device_name(device
), ACPI_PCI_LINK_DEVICE_NAME
);
700 strcpy(acpi_device_class(device
), ACPI_PCI_LINK_CLASS
);
701 device
->driver_data
= link
;
703 mutex_lock(&acpi_link_lock
);
704 result
= acpi_pci_link_get_possible(link
);
708 /* query and set link->irq.active */
709 acpi_pci_link_get_current(link
);
711 printk(KERN_INFO PREFIX
"%s [%s] (IRQs", acpi_device_name(device
),
712 acpi_device_bid(device
));
713 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
714 if (link
->irq
.active
== link
->irq
.possible
[i
]) {
715 printk(KERN_CONT
" *%d", link
->irq
.possible
[i
]);
718 printk(KERN_CONT
" %d", link
->irq
.possible
[i
]);
721 printk(KERN_CONT
")");
724 printk(KERN_CONT
" *%d", link
->irq
.active
);
726 if (!link
->device
->status
.enabled
)
727 printk(KERN_CONT
", disabled.");
729 printk(KERN_CONT
"\n");
731 list_add_tail(&link
->list
, &acpi_link_list
);
734 /* disable all links -- to be activated on use */
735 acpi_evaluate_object(device
->handle
, "_DIS", NULL
, NULL
);
736 mutex_unlock(&acpi_link_lock
);
741 return result
< 0 ? result
: 1;
744 static int acpi_pci_link_resume(struct acpi_pci_link
*link
)
746 if (link
->refcnt
&& link
->irq
.active
&& link
->irq
.initialized
)
747 return (acpi_pci_link_set(link
, link
->irq
.active
));
752 static void irqrouter_resume(void)
754 struct acpi_pci_link
*link
;
756 list_for_each_entry(link
, &acpi_link_list
, list
) {
757 acpi_pci_link_resume(link
);
761 static void acpi_pci_link_remove(struct acpi_device
*device
)
763 struct acpi_pci_link
*link
;
765 link
= acpi_driver_data(device
);
767 mutex_lock(&acpi_link_lock
);
768 list_del(&link
->list
);
769 mutex_unlock(&acpi_link_lock
);
775 * modify acpi_irq_penalty[] from cmdline
777 static int __init
acpi_irq_penalty_update(char *str
, int used
)
781 for (i
= 0; i
< 16; i
++) {
785 retval
= get_option(&str
, &irq
);
788 break; /* no number found */
793 if (irq
>= ARRAY_SIZE(acpi_irq_penalty
))
797 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
799 acpi_irq_penalty
[irq
] = PIRQ_PENALTY_PCI_AVAILABLE
;
801 if (retval
!= 2) /* no next number */
808 * We'd like PNP to call this routine for the
809 * single ISA_USED value for each legacy device.
810 * But instead it calls us with each POSSIBLE setting.
811 * There is no ISA_POSSIBLE weight, so we simply use
812 * the (small) PCI_USING penalty.
814 void acpi_penalize_isa_irq(int irq
, int active
)
816 if (irq
>= 0 && irq
< ARRAY_SIZE(acpi_irq_penalty
)) {
818 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
820 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_PCI_USING
;
825 * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict with
826 * PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be use for
829 void acpi_penalize_sci_irq(int irq
, int trigger
, int polarity
)
831 if (irq
>= 0 && irq
< ARRAY_SIZE(acpi_irq_penalty
)) {
832 if (trigger
!= ACPI_MADT_TRIGGER_LEVEL
||
833 polarity
!= ACPI_MADT_POLARITY_ACTIVE_LOW
)
834 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_ALWAYS
;
836 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_PCI_USING
;
841 * Over-ride default table to reserve additional IRQs for use by ISA
842 * e.g. acpi_irq_isa=5
843 * Useful for telling ACPI how not to interfere with your ISA sound card.
845 static int __init
acpi_irq_isa(char *str
)
847 return acpi_irq_penalty_update(str
, 1);
850 __setup("acpi_irq_isa=", acpi_irq_isa
);
853 * Over-ride default table to free additional IRQs for use by PCI
854 * e.g. acpi_irq_pci=7,15
855 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
857 static int __init
acpi_irq_pci(char *str
)
859 return acpi_irq_penalty_update(str
, 0);
862 __setup("acpi_irq_pci=", acpi_irq_pci
);
864 static int __init
acpi_irq_nobalance_set(char *str
)
866 acpi_irq_balance
= 0;
870 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set
);
872 static int __init
acpi_irq_balance_set(char *str
)
874 acpi_irq_balance
= 1;
878 __setup("acpi_irq_balance", acpi_irq_balance_set
);
880 static struct syscore_ops irqrouter_syscore_ops
= {
881 .resume
= irqrouter_resume
,
884 void __init
acpi_pci_link_init(void)
889 if (acpi_irq_balance
== -1) {
890 /* no command line switch: enable balancing in IOAPIC mode */
891 if (acpi_irq_model
== ACPI_IRQ_MODEL_IOAPIC
)
892 acpi_irq_balance
= 1;
894 acpi_irq_balance
= 0;
896 register_syscore_ops(&irqrouter_syscore_ops
);
897 acpi_scan_add_handler(&pci_link_handler
);