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/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>
40 #include <linux/pci.h>
41 #include <linux/mutex.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
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
);
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
,
63 .add
= acpi_pci_link_add
,
64 .remove
= acpi_pci_link_remove
,
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
72 struct acpi_pci_link_irq
{
73 u8 active
; /* Current IRQ */
74 u8 triggering
; /* All IRQs */
75 u8 polarity
; /* All IRQs */
78 u8 possible
[ACPI_PCI_LINK_MAX_POSSIBLE
];
83 struct acpi_pci_link
{
84 struct list_head node
;
85 struct acpi_device
*device
;
87 struct acpi_pci_link_irq irq
;
93 struct list_head entries
;
95 DEFINE_MUTEX(acpi_link_lock
);
97 /* --------------------------------------------------------------------------
98 PCI Link Device Management
99 -------------------------------------------------------------------------- */
102 * set context (link) possible list from resource list
105 acpi_pci_link_check_possible(struct acpi_resource
*resource
, void *context
)
107 struct acpi_pci_link
*link
= (struct acpi_pci_link
*)context
;
110 ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
112 switch (resource
->type
) {
113 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
114 return_ACPI_STATUS(AE_OK
);
115 case ACPI_RESOURCE_TYPE_IRQ
:
117 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
118 if (!p
|| !p
->interrupt_count
) {
119 printk(KERN_WARNING PREFIX
"Blank IRQ resource\n");
120 return_ACPI_STATUS(AE_OK
);
123 (i
< p
->interrupt_count
124 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
125 if (!p
->interrupts
[i
]) {
126 printk(KERN_WARNING PREFIX
"Invalid 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 EXT IRQ resource\n");
145 return_ACPI_STATUS(AE_OK
);
148 (i
< p
->interrupt_count
149 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
150 if (!p
->interrupts
[i
]) {
151 printk(KERN_WARNING PREFIX
"Invalid IRQ %d\n",
155 link
->irq
.possible
[i
] = p
->interrupts
[i
];
156 link
->irq
.possible_count
++;
158 link
->irq
.triggering
= p
->triggering
;
159 link
->irq
.polarity
= p
->polarity
;
160 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
164 printk(KERN_ERR PREFIX
"Resource is not an IRQ entry\n");
165 return_ACPI_STATUS(AE_OK
);
168 return_ACPI_STATUS(AE_CTRL_TERMINATE
);
171 static int acpi_pci_link_get_possible(struct acpi_pci_link
*link
)
175 ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
178 return_VALUE(-EINVAL
);
180 status
= acpi_walk_resources(link
->handle
, METHOD_NAME__PRS
,
181 acpi_pci_link_check_possible
, link
);
182 if (ACPI_FAILURE(status
)) {
183 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRS"));
184 return_VALUE(-ENODEV
);
187 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
188 "Found %d possible IRQs\n",
189 link
->irq
.possible_count
));
195 acpi_pci_link_check_current(struct acpi_resource
*resource
, void *context
)
197 int *irq
= (int *)context
;
199 ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
201 switch (resource
->type
) {
202 case ACPI_RESOURCE_TYPE_IRQ
:
204 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
205 if (!p
|| !p
->interrupt_count
) {
207 * IRQ descriptors may have no IRQ# bits set,
208 * particularly those those w/ _STA disabled
210 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
211 "Blank IRQ resource\n"));
212 return_ACPI_STATUS(AE_OK
);
214 *irq
= p
->interrupts
[0];
217 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
219 struct acpi_resource_extended_irq
*p
=
220 &resource
->data
.extended_irq
;
221 if (!p
|| !p
->interrupt_count
) {
223 * extended IRQ descriptors must
224 * return at least 1 IRQ
226 printk(KERN_WARNING PREFIX
227 "Blank EXT IRQ resource\n");
228 return_ACPI_STATUS(AE_OK
);
230 *irq
= p
->interrupts
[0];
235 printk(KERN_ERR PREFIX
"Resource %d isn't an IRQ\n", resource
->type
);
236 case ACPI_RESOURCE_TYPE_END_TAG
:
237 return_ACPI_STATUS(AE_OK
);
239 return_ACPI_STATUS(AE_CTRL_TERMINATE
);
243 * Run _CRS and set link->irq.active
249 static int acpi_pci_link_get_current(struct acpi_pci_link
*link
)
252 acpi_status status
= AE_OK
;
255 ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
257 if (!link
|| !link
->handle
)
258 return_VALUE(-EINVAL
);
260 link
->irq
.active
= 0;
262 /* in practice, status disabled is meaningless, ignore it */
264 /* Query _STA, set link->device->status */
265 result
= acpi_bus_get_status(link
->device
);
267 printk(KERN_ERR PREFIX
"Unable to read status\n");
271 if (!link
->device
->status
.enabled
) {
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link disabled\n"));
278 * Query and parse _CRS to get the current IRQ assignment.
281 status
= acpi_walk_resources(link
->handle
, METHOD_NAME__CRS
,
282 acpi_pci_link_check_current
, &irq
);
283 if (ACPI_FAILURE(status
)) {
284 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _CRS"));
289 if (acpi_strict
&& !irq
) {
290 printk(KERN_ERR PREFIX
"_CRS returned 0\n");
294 link
->irq
.active
= irq
;
296 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link at IRQ %d \n", link
->irq
.active
));
299 return_VALUE(result
);
302 static int acpi_pci_link_set(struct acpi_pci_link
*link
, int irq
)
305 acpi_status status
= AE_OK
;
307 struct acpi_resource res
;
308 struct acpi_resource end
;
310 struct acpi_buffer buffer
= { 0, NULL
};
312 ACPI_FUNCTION_TRACE("acpi_pci_link_set");
315 return_VALUE(-EINVAL
);
317 resource
= kmalloc(sizeof(*resource
) + 1, GFP_ATOMIC
);
319 return_VALUE(-ENOMEM
);
321 memset(resource
, 0, sizeof(*resource
) + 1);
322 buffer
.length
= sizeof(*resource
) + 1;
323 buffer
.pointer
= resource
;
325 switch (link
->irq
.resource_type
) {
326 case ACPI_RESOURCE_TYPE_IRQ
:
327 resource
->res
.type
= ACPI_RESOURCE_TYPE_IRQ
;
328 resource
->res
.length
= sizeof(struct acpi_resource
);
329 resource
->res
.data
.irq
.triggering
= link
->irq
.triggering
;
330 resource
->res
.data
.irq
.polarity
=
332 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
333 resource
->res
.data
.irq
.sharable
=
336 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
337 resource
->res
.data
.irq
.interrupt_count
= 1;
338 resource
->res
.data
.irq
.interrupts
[0] = irq
;
341 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
342 resource
->res
.type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
343 resource
->res
.length
= sizeof(struct acpi_resource
);
344 resource
->res
.data
.extended_irq
.producer_consumer
=
346 resource
->res
.data
.extended_irq
.triggering
=
347 link
->irq
.triggering
;
348 resource
->res
.data
.extended_irq
.polarity
=
350 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
351 resource
->res
.data
.irq
.sharable
=
354 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
355 resource
->res
.data
.extended_irq
.interrupt_count
= 1;
356 resource
->res
.data
.extended_irq
.interrupts
[0] = irq
;
357 /* ignore resource_source, it's optional */
360 printk(KERN_ERR PREFIX
"Invalid Resource_type %d\n", link
->irq
.resource_type
);
365 resource
->end
.type
= ACPI_RESOURCE_TYPE_END_TAG
;
367 /* Attempt to set the resource */
368 status
= acpi_set_current_resources(link
->handle
, &buffer
);
370 /* check for total failure */
371 if (ACPI_FAILURE(status
)) {
372 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _SRS"));
377 /* Query _STA, set device->status */
378 result
= acpi_bus_get_status(link
->device
);
380 printk(KERN_ERR PREFIX
"Unable to read status\n");
383 if (!link
->device
->status
.enabled
) {
384 printk(KERN_WARNING PREFIX
385 "%s [%s] disabled and referenced, BIOS bug\n",
386 acpi_device_name(link
->device
),
387 acpi_device_bid(link
->device
));
390 /* Query _CRS, set link->irq.active */
391 result
= acpi_pci_link_get_current(link
);
397 * Is current setting not what we set?
398 * set link->irq.active
400 if (link
->irq
.active
!= irq
) {
402 * policy: when _CRS doesn't return what we just _SRS
403 * assume _SRS worked and override _CRS value.
405 printk(KERN_WARNING PREFIX
406 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
407 acpi_device_name(link
->device
),
408 acpi_device_bid(link
->device
), link
->irq
.active
, irq
);
409 link
->irq
.active
= irq
;
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Set IRQ %d\n", link
->irq
.active
));
416 return_VALUE(result
);
419 /* --------------------------------------------------------------------------
420 PCI Link IRQ Management
421 -------------------------------------------------------------------------- */
424 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
425 * Link Devices to move the PIRQs around to minimize sharing.
427 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
428 * that the BIOS has already set to active. This is necessary because
429 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
430 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
431 * even if acpi_irq_nobalance is set.
433 * A tables of penalties avoids directing PCI interrupts to well known
434 * ISA IRQs. Boot params are available to over-ride the default table:
436 * List interrupts that are free for PCI use.
439 * List interrupts that should not be used for PCI:
442 * Note that PCI IRQ routers have a list of possible IRQs,
443 * which may not include the IRQs this table says are available.
445 * Since this heuristic can't tell the difference between a link
446 * that no device will attach to, vs. a link which may be shared
447 * by multiple active devices -- it is not optimal.
449 * If interrupt performance is that important, get an IO-APIC system
450 * with a pin dedicated to each device. Or for that matter, an MSI
454 #define ACPI_MAX_IRQS 256
455 #define ACPI_MAX_ISA_IRQ 16
457 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
458 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
459 #define PIRQ_PENALTY_PCI_USING (16*16*16)
460 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
461 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
462 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
464 static int acpi_irq_penalty
[ACPI_MAX_IRQS
] = {
465 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ0 timer */
466 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ1 keyboard */
467 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ2 cascade */
468 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ3 serial */
469 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ4 serial */
470 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ5 sometimes SoundBlaster */
471 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ6 */
472 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ7 parallel, spurious */
473 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ8 rtc, sometimes */
474 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ9 PCI, often acpi */
475 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ10 PCI */
476 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ11 PCI */
477 PIRQ_PENALTY_ISA_USED
, /* IRQ12 mouse */
478 PIRQ_PENALTY_ISA_USED
, /* IRQ13 fpe, sometimes */
479 PIRQ_PENALTY_ISA_USED
, /* IRQ14 ide0 */
480 PIRQ_PENALTY_ISA_USED
, /* IRQ15 ide1 */
484 int __init
acpi_irq_penalty_init(void)
486 struct list_head
*node
= NULL
;
487 struct acpi_pci_link
*link
= NULL
;
490 ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
493 * Update penalties to facilitate IRQ balancing.
495 list_for_each(node
, &acpi_link
.entries
) {
497 link
= list_entry(node
, struct acpi_pci_link
, node
);
499 printk(KERN_ERR PREFIX
"Invalid link context\n");
504 * reflect the possible and active irqs in the penalty table --
505 * useful for breaking ties.
507 if (link
->irq
.possible_count
) {
509 PIRQ_PENALTY_PCI_POSSIBLE
/
510 link
->irq
.possible_count
;
512 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
513 if (link
->irq
.possible
[i
] < ACPI_MAX_ISA_IRQ
)
514 acpi_irq_penalty
[link
->irq
.
519 } else if (link
->irq
.active
) {
520 acpi_irq_penalty
[link
->irq
.active
] +=
521 PIRQ_PENALTY_PCI_POSSIBLE
;
524 /* Add a penalty for the SCI */
525 acpi_irq_penalty
[acpi_fadt
.sci_int
] += PIRQ_PENALTY_PCI_USING
;
530 static int acpi_irq_balance
; /* 0: static, 1: balance */
532 static int acpi_pci_link_allocate(struct acpi_pci_link
*link
)
537 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
539 if (link
->irq
.initialized
) {
540 if (link
->refcnt
== 0)
541 /* This means the link is disabled but initialized */
542 acpi_pci_link_set(link
, link
->irq
.active
);
547 * search for active IRQ in list of possible IRQs.
549 for (i
= 0; i
< link
->irq
.possible_count
; ++i
) {
550 if (link
->irq
.active
== link
->irq
.possible
[i
])
554 * forget active IRQ that is not in possible list
556 if (i
== link
->irq
.possible_count
) {
558 printk(KERN_WARNING PREFIX
"_CRS %d not found"
559 " in _PRS\n", link
->irq
.active
);
560 link
->irq
.active
= 0;
564 * if active found, use it; else pick entry from end of possible list.
566 if (link
->irq
.active
) {
567 irq
= link
->irq
.active
;
569 irq
= link
->irq
.possible
[link
->irq
.possible_count
- 1];
572 if (acpi_irq_balance
|| !link
->irq
.active
) {
574 * Select the best IRQ. This is done in reverse to promote
575 * the use of IRQs 9, 10, 11, and >15.
577 for (i
= (link
->irq
.possible_count
- 1); i
>= 0; i
--) {
578 if (acpi_irq_penalty
[irq
] >
579 acpi_irq_penalty
[link
->irq
.possible
[i
]])
580 irq
= link
->irq
.possible
[i
];
584 /* Attempt to enable the link device at this IRQ. */
585 if (acpi_pci_link_set(link
, irq
)) {
586 printk(KERN_ERR PREFIX
"Unable to set IRQ for %s [%s]. "
587 "Try pci=noacpi or acpi=off\n",
588 acpi_device_name(link
->device
),
589 acpi_device_bid(link
->device
));
590 return_VALUE(-ENODEV
);
592 acpi_irq_penalty
[link
->irq
.active
] += PIRQ_PENALTY_PCI_USING
;
593 printk(PREFIX
"%s [%s] enabled at IRQ %d\n",
594 acpi_device_name(link
->device
),
595 acpi_device_bid(link
->device
), link
->irq
.active
);
598 link
->irq
.initialized
= 1;
604 * acpi_pci_link_allocate_irq
605 * success: return IRQ >= 0
610 acpi_pci_link_allocate_irq(acpi_handle handle
,
612 int *triggering
, int *polarity
, char **name
)
615 struct acpi_device
*device
= NULL
;
616 struct acpi_pci_link
*link
= NULL
;
618 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
620 result
= acpi_bus_get_device(handle
, &device
);
622 printk(KERN_ERR PREFIX
"Invalid link device\n");
626 link
= (struct acpi_pci_link
*)acpi_driver_data(device
);
628 printk(KERN_ERR PREFIX
"Invalid link context\n");
632 /* TBD: Support multiple index (IRQ) entries per Link Device */
634 printk(KERN_ERR PREFIX
"Invalid index %d\n", index
);
638 mutex_lock(&acpi_link_lock
);
639 if (acpi_pci_link_allocate(link
)) {
640 mutex_unlock(&acpi_link_lock
);
644 if (!link
->irq
.active
) {
645 mutex_unlock(&acpi_link_lock
);
646 printk(KERN_ERR PREFIX
"Link active IRQ is 0!\n");
650 mutex_unlock(&acpi_link_lock
);
653 *triggering
= link
->irq
.triggering
;
655 *polarity
= link
->irq
.polarity
;
657 *name
= acpi_device_bid(link
->device
);
658 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
659 "Link %s is referenced\n",
660 acpi_device_bid(link
->device
)));
661 return_VALUE(link
->irq
.active
);
665 * We don't change link's irq information here. After it is reenabled, we
666 * continue use the info
668 int acpi_pci_link_free_irq(acpi_handle handle
)
670 struct acpi_device
*device
= NULL
;
671 struct acpi_pci_link
*link
= NULL
;
674 ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
676 result
= acpi_bus_get_device(handle
, &device
);
678 printk(KERN_ERR PREFIX
"Invalid link device\n");
682 link
= (struct acpi_pci_link
*)acpi_driver_data(device
);
684 printk(KERN_ERR PREFIX
"Invalid link context\n");
688 mutex_lock(&acpi_link_lock
);
689 if (!link
->irq
.initialized
) {
690 mutex_unlock(&acpi_link_lock
);
691 printk(KERN_ERR PREFIX
"Link isn't initialized\n");
696 * The Link reference count allows us to _DISable an unused link
697 * and suspend time, and set it again on resume.
698 * However, 2.6.12 still has irq_router.resume
699 * which blindly restores the link state.
700 * So we disable the reference count method
701 * to prevent duplicate acpi_pci_link_set()
702 * which would harm some systems
706 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
707 "Link %s is dereferenced\n",
708 acpi_device_bid(link
->device
)));
710 if (link
->refcnt
== 0) {
711 acpi_ut_evaluate_object(link
->handle
, "_DIS", 0, NULL
);
713 mutex_unlock(&acpi_link_lock
);
714 return_VALUE(link
->irq
.active
);
717 /* --------------------------------------------------------------------------
719 -------------------------------------------------------------------------- */
721 static int acpi_pci_link_add(struct acpi_device
*device
)
724 struct acpi_pci_link
*link
= NULL
;
728 ACPI_FUNCTION_TRACE("acpi_pci_link_add");
731 return_VALUE(-EINVAL
);
733 link
= kmalloc(sizeof(struct acpi_pci_link
), GFP_KERNEL
);
735 return_VALUE(-ENOMEM
);
736 memset(link
, 0, sizeof(struct acpi_pci_link
));
738 link
->device
= device
;
739 link
->handle
= device
->handle
;
740 strcpy(acpi_device_name(device
), ACPI_PCI_LINK_DEVICE_NAME
);
741 strcpy(acpi_device_class(device
), ACPI_PCI_LINK_CLASS
);
742 acpi_driver_data(device
) = link
;
744 mutex_lock(&acpi_link_lock
);
745 result
= acpi_pci_link_get_possible(link
);
749 /* query and set link->irq.active */
750 acpi_pci_link_get_current(link
);
752 printk(PREFIX
"%s [%s] (IRQs", acpi_device_name(device
),
753 acpi_device_bid(device
));
754 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
755 if (link
->irq
.active
== link
->irq
.possible
[i
]) {
756 printk(" *%d", link
->irq
.possible
[i
]);
759 printk(" %d", link
->irq
.possible
[i
]);
765 printk(" *%d", link
->irq
.active
);
767 if (!link
->device
->status
.enabled
)
768 printk(", disabled.");
772 /* TBD: Acquire/release lock */
773 list_add_tail(&link
->node
, &acpi_link
.entries
);
777 /* disable all links -- to be activated on use */
778 acpi_ut_evaluate_object(link
->handle
, "_DIS", 0, NULL
);
779 mutex_unlock(&acpi_link_lock
);
784 return_VALUE(result
);
787 static int acpi_pci_link_resume(struct acpi_pci_link
*link
)
789 ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
791 if (link
->refcnt
&& link
->irq
.active
&& link
->irq
.initialized
)
792 return_VALUE(acpi_pci_link_set(link
, link
->irq
.active
));
798 * FIXME: this is a workaround to avoid nasty warning. It will be removed
799 * after every device calls pci_disable_device in .resume.
802 static int irqrouter_resume(struct sys_device
*dev
)
804 struct list_head
*node
= NULL
;
805 struct acpi_pci_link
*link
= NULL
;
807 ACPI_FUNCTION_TRACE("irqrouter_resume");
809 /* Make sure SCI is enabled again (Apple firmware bug?) */
810 acpi_set_register(ACPI_BITREG_SCI_ENABLE
, 1, ACPI_MTX_DO_NOT_LOCK
);
813 list_for_each(node
, &acpi_link
.entries
) {
814 link
= list_entry(node
, struct acpi_pci_link
, node
);
816 printk(KERN_ERR PREFIX
"Invalid link context\n");
819 acpi_pci_link_resume(link
);
825 static int acpi_pci_link_remove(struct acpi_device
*device
, int type
)
827 struct acpi_pci_link
*link
= NULL
;
829 ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
831 if (!device
|| !acpi_driver_data(device
))
832 return_VALUE(-EINVAL
);
834 link
= (struct acpi_pci_link
*)acpi_driver_data(device
);
836 mutex_lock(&acpi_link_lock
);
837 list_del(&link
->node
);
838 mutex_unlock(&acpi_link_lock
);
846 * modify acpi_irq_penalty[] from cmdline
848 static int __init
acpi_irq_penalty_update(char *str
, int used
)
852 for (i
= 0; i
< 16; i
++) {
856 retval
= get_option(&str
, &irq
);
859 break; /* no number found */
864 if (irq
>= ACPI_MAX_IRQS
)
868 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
870 acpi_irq_penalty
[irq
] = PIRQ_PENALTY_PCI_AVAILABLE
;
872 if (retval
!= 2) /* no next number */
879 * We'd like PNP to call this routine for the
880 * single ISA_USED value for each legacy device.
881 * But instead it calls us with each POSSIBLE setting.
882 * There is no ISA_POSSIBLE weight, so we simply use
883 * the (small) PCI_USING penalty.
885 void acpi_penalize_isa_irq(int irq
, int active
)
888 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
890 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_PCI_USING
;
894 * Over-ride default table to reserve additional IRQs for use by ISA
895 * e.g. acpi_irq_isa=5
896 * Useful for telling ACPI how not to interfere with your ISA sound card.
898 static int __init
acpi_irq_isa(char *str
)
900 return acpi_irq_penalty_update(str
, 1);
903 __setup("acpi_irq_isa=", acpi_irq_isa
);
906 * Over-ride default table to free additional IRQs for use by PCI
907 * e.g. acpi_irq_pci=7,15
908 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
910 static int __init
acpi_irq_pci(char *str
)
912 return acpi_irq_penalty_update(str
, 0);
915 __setup("acpi_irq_pci=", acpi_irq_pci
);
917 static int __init
acpi_irq_nobalance_set(char *str
)
919 acpi_irq_balance
= 0;
923 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set
);
925 int __init
acpi_irq_balance_set(char *str
)
927 acpi_irq_balance
= 1;
931 __setup("acpi_irq_balance", acpi_irq_balance_set
);
933 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
934 static struct sysdev_class irqrouter_sysdev_class
= {
935 set_kset_name("irqrouter"),
936 .resume
= irqrouter_resume
,
939 static struct sys_device device_irqrouter
= {
941 .cls
= &irqrouter_sysdev_class
,
944 static int __init
irqrouter_init_sysfs(void)
948 ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
950 if (acpi_disabled
|| acpi_noirq
)
953 error
= sysdev_class_register(&irqrouter_sysdev_class
);
955 error
= sysdev_register(&device_irqrouter
);
960 device_initcall(irqrouter_init_sysfs
);
962 static int __init
acpi_pci_link_init(void)
964 ACPI_FUNCTION_TRACE("acpi_pci_link_init");
970 INIT_LIST_HEAD(&acpi_link
.entries
);
972 if (acpi_bus_register_driver(&acpi_pci_link_driver
) < 0)
973 return_VALUE(-ENODEV
);
978 subsys_initcall(acpi_pci_link_init
);