Root/drivers/acpi/pci_link.c

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/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>
38#include <linux/pm.h>
39#include <linux/pci.h>
40#include <linux/mutex.h>
41#include <linux/slab.h>
42
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45
46#define PREFIX "ACPI: "
47
48#define _COMPONENT ACPI_PCI_COMPONENT
49ACPI_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
55
56static int acpi_pci_link_add(struct acpi_device *device);
57static int acpi_pci_link_remove(struct acpi_device *device, int type);
58
59static const struct acpi_device_id link_device_ids[] = {
60    {"PNP0C0F", 0},
61    {"", 0},
62};
63MODULE_DEVICE_TABLE(acpi, link_device_ids);
64
65static struct acpi_driver acpi_pci_link_driver = {
66    .name = "pci_link",
67    .class = ACPI_PCI_LINK_CLASS,
68    .ids = link_device_ids,
69    .ops = {
70        .add = acpi_pci_link_add,
71        .remove = acpi_pci_link_remove,
72    },
73};
74
75/*
76 * If a link is initialized, we never change its active and initialized
77 * later even the link is disable. Instead, we just repick the active irq
78 */
79struct acpi_pci_link_irq {
80    u8 active; /* Current IRQ */
81    u8 triggering; /* All IRQs */
82    u8 polarity; /* All IRQs */
83    u8 resource_type;
84    u8 possible_count;
85    u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
86    u8 initialized:1;
87    u8 reserved:7;
88};
89
90struct acpi_pci_link {
91    struct list_head list;
92    struct acpi_device *device;
93    struct acpi_pci_link_irq irq;
94    int refcnt;
95};
96
97static LIST_HEAD(acpi_link_list);
98static DEFINE_MUTEX(acpi_link_lock);
99
100/* --------------------------------------------------------------------------
101                            PCI Link Device Management
102   -------------------------------------------------------------------------- */
103
104/*
105 * set context (link) possible list from resource list
106 */
107static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
108                        void *context)
109{
110    struct acpi_pci_link *link = context;
111    u32 i;
112
113    switch (resource->type) {
114    case ACPI_RESOURCE_TYPE_START_DEPENDENT:
115    case ACPI_RESOURCE_TYPE_END_TAG:
116        return AE_OK;
117    case ACPI_RESOURCE_TYPE_IRQ:
118        {
119            struct acpi_resource_irq *p = &resource->data.irq;
120            if (!p || !p->interrupt_count) {
121                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
122                          "Blank _PRS IRQ resource\n"));
123                return AE_OK;
124            }
125            for (i = 0;
126                 (i < p->interrupt_count
127                  && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
128                if (!p->interrupts[i]) {
129                    printk(KERN_WARNING PREFIX
130                           "Invalid _PRS IRQ %d\n",
131                           p->interrupts[i]);
132                    continue;
133                }
134                link->irq.possible[i] = p->interrupts[i];
135                link->irq.possible_count++;
136            }
137            link->irq.triggering = p->triggering;
138            link->irq.polarity = p->polarity;
139            link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
140            break;
141        }
142    case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
143        {
144            struct acpi_resource_extended_irq *p =
145                &resource->data.extended_irq;
146            if (!p || !p->interrupt_count) {
147                printk(KERN_WARNING PREFIX
148                          "Blank _PRS EXT IRQ resource\n");
149                return AE_OK;
150            }
151            for (i = 0;
152                 (i < p->interrupt_count
153                  && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
154                if (!p->interrupts[i]) {
155                    printk(KERN_WARNING PREFIX
156                           "Invalid _PRS IRQ %d\n",
157                           p->interrupts[i]);
158                    continue;
159                }
160                link->irq.possible[i] = p->interrupts[i];
161                link->irq.possible_count++;
162            }
163            link->irq.triggering = p->triggering;
164            link->irq.polarity = p->polarity;
165            link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
166            break;
167        }
168    default:
169        printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
170               resource->type);
171        return AE_OK;
172    }
173
174    return AE_CTRL_TERMINATE;
175}
176
177static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
178{
179    acpi_status status;
180
181    status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
182                     acpi_pci_link_check_possible, link);
183    if (ACPI_FAILURE(status)) {
184        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
185        return -ENODEV;
186    }
187
188    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
189              "Found %d possible IRQs\n",
190              link->irq.possible_count));
191
192    return 0;
193}
194
195static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
196                           void *context)
197{
198    int *irq = context;
199
200    switch (resource->type) {
201    case ACPI_RESOURCE_TYPE_START_DEPENDENT:
202    case ACPI_RESOURCE_TYPE_END_TAG:
203        return AE_OK;
204    case ACPI_RESOURCE_TYPE_IRQ:
205        {
206            struct acpi_resource_irq *p = &resource->data.irq;
207            if (!p || !p->interrupt_count) {
208                /*
209                 * IRQ descriptors may have no IRQ# bits set,
210                 * particularly those those w/ _STA disabled
211                 */
212                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
213                          "Blank _CRS IRQ resource\n"));
214                return AE_OK;
215            }
216            *irq = p->interrupts[0];
217            break;
218        }
219    case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
220        {
221            struct acpi_resource_extended_irq *p =
222                &resource->data.extended_irq;
223            if (!p || !p->interrupt_count) {
224                /*
225                 * extended IRQ descriptors must
226                 * return at least 1 IRQ
227                 */
228                printk(KERN_WARNING PREFIX
229                          "Blank _CRS EXT IRQ resource\n");
230                return AE_OK;
231            }
232            *irq = p->interrupts[0];
233            break;
234        }
235        break;
236    default:
237        printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
238               resource->type);
239        return AE_OK;
240    }
241
242    return AE_CTRL_TERMINATE;
243}
244
245/*
246 * Run _CRS and set link->irq.active
247 *
248 * return value:
249 * 0 - success
250 * !0 - failure
251 */
252static int acpi_pci_link_get_current(struct acpi_pci_link *link)
253{
254    int result = 0;
255    acpi_status status;
256    int irq = 0;
257
258    link->irq.active = 0;
259
260    /* in practice, status disabled is meaningless, ignore it */
261    if (acpi_strict) {
262        /* Query _STA, set link->device->status */
263        result = acpi_bus_get_status(link->device);
264        if (result) {
265            printk(KERN_ERR PREFIX "Unable to read status\n");
266            goto end;
267        }
268
269        if (!link->device->status.enabled) {
270            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
271            return 0;
272        }
273    }
274
275    /*
276     * Query and parse _CRS to get the current IRQ assignment.
277     */
278
279    status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
280                     acpi_pci_link_check_current, &irq);
281    if (ACPI_FAILURE(status)) {
282        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
283        result = -ENODEV;
284        goto end;
285    }
286
287    if (acpi_strict && !irq) {
288        printk(KERN_ERR PREFIX "_CRS returned 0\n");
289        result = -ENODEV;
290    }
291
292    link->irq.active = irq;
293
294    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
295
296      end:
297    return result;
298}
299
300static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
301{
302    int result;
303    acpi_status status;
304    struct {
305        struct acpi_resource res;
306        struct acpi_resource end;
307    } *resource;
308    struct acpi_buffer buffer = { 0, NULL };
309
310    if (!irq)
311        return -EINVAL;
312
313    resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
314    if (!resource)
315        return -ENOMEM;
316
317    buffer.length = sizeof(*resource) + 1;
318    buffer.pointer = resource;
319
320    switch (link->irq.resource_type) {
321    case ACPI_RESOURCE_TYPE_IRQ:
322        resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
323        resource->res.length = sizeof(struct acpi_resource);
324        resource->res.data.irq.triggering = link->irq.triggering;
325        resource->res.data.irq.polarity =
326            link->irq.polarity;
327        if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
328            resource->res.data.irq.sharable =
329                ACPI_EXCLUSIVE;
330        else
331            resource->res.data.irq.sharable = ACPI_SHARED;
332        resource->res.data.irq.interrupt_count = 1;
333        resource->res.data.irq.interrupts[0] = irq;
334        break;
335
336    case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
337        resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
338        resource->res.length = sizeof(struct acpi_resource);
339        resource->res.data.extended_irq.producer_consumer =
340            ACPI_CONSUMER;
341        resource->res.data.extended_irq.triggering =
342            link->irq.triggering;
343        resource->res.data.extended_irq.polarity =
344            link->irq.polarity;
345        if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
346            resource->res.data.irq.sharable =
347                ACPI_EXCLUSIVE;
348        else
349            resource->res.data.irq.sharable = ACPI_SHARED;
350        resource->res.data.extended_irq.interrupt_count = 1;
351        resource->res.data.extended_irq.interrupts[0] = irq;
352        /* ignore resource_source, it's optional */
353        break;
354    default:
355        printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
356        result = -EINVAL;
357        goto end;
358
359    }
360    resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
361
362    /* Attempt to set the resource */
363    status = acpi_set_current_resources(link->device->handle, &buffer);
364
365    /* check for total failure */
366    if (ACPI_FAILURE(status)) {
367        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
368        result = -ENODEV;
369        goto end;
370    }
371
372    /* Query _STA, set device->status */
373    result = acpi_bus_get_status(link->device);
374    if (result) {
375        printk(KERN_ERR PREFIX "Unable to read status\n");
376        goto end;
377    }
378    if (!link->device->status.enabled) {
379        printk(KERN_WARNING PREFIX
380                  "%s [%s] disabled and referenced, BIOS bug\n",
381                  acpi_device_name(link->device),
382                  acpi_device_bid(link->device));
383    }
384
385    /* Query _CRS, set link->irq.active */
386    result = acpi_pci_link_get_current(link);
387    if (result) {
388        goto end;
389    }
390
391    /*
392     * Is current setting not what we set?
393     * set link->irq.active
394     */
395    if (link->irq.active != irq) {
396        /*
397         * policy: when _CRS doesn't return what we just _SRS
398         * assume _SRS worked and override _CRS value.
399         */
400        printk(KERN_WARNING PREFIX
401                  "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
402                  acpi_device_name(link->device),
403                  acpi_device_bid(link->device), link->irq.active, irq);
404        link->irq.active = irq;
405    }
406
407    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
408
409      end:
410    kfree(resource);
411    return result;
412}
413
414/* --------------------------------------------------------------------------
415                            PCI Link IRQ Management
416   -------------------------------------------------------------------------- */
417
418/*
419 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
420 * Link Devices to move the PIRQs around to minimize sharing.
421 *
422 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
423 * that the BIOS has already set to active. This is necessary because
424 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
425 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
426 * even if acpi_irq_nobalance is set.
427 *
428 * A tables of penalties avoids directing PCI interrupts to well known
429 * ISA IRQs. Boot params are available to over-ride the default table:
430 *
431 * List interrupts that are free for PCI use.
432 * acpi_irq_pci=n[,m]
433 *
434 * List interrupts that should not be used for PCI:
435 * acpi_irq_isa=n[,m]
436 *
437 * Note that PCI IRQ routers have a list of possible IRQs,
438 * which may not include the IRQs this table says are available.
439 *
440 * Since this heuristic can't tell the difference between a link
441 * that no device will attach to, vs. a link which may be shared
442 * by multiple active devices -- it is not optimal.
443 *
444 * If interrupt performance is that important, get an IO-APIC system
445 * with a pin dedicated to each device. Or for that matter, an MSI
446 * enabled system.
447 */
448
449#define ACPI_MAX_IRQS 256
450#define ACPI_MAX_ISA_IRQ 16
451
452#define PIRQ_PENALTY_PCI_AVAILABLE (0)
453#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
454#define PIRQ_PENALTY_PCI_USING (16*16*16)
455#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
456#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
457#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
458
459static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
460    PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
461    PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
462    PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
463    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
464    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
465    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
466    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
467    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
468    PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
469    PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
470    PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
471    PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
472    PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
473    PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
474    PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
475    PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
476    /* >IRQ15 */
477};
478
479int __init acpi_irq_penalty_init(void)
480{
481    struct acpi_pci_link *link;
482    int i;
483
484    /*
485     * Update penalties to facilitate IRQ balancing.
486     */
487    list_for_each_entry(link, &acpi_link_list, list) {
488
489        /*
490         * reflect the possible and active irqs in the penalty table --
491         * useful for breaking ties.
492         */
493        if (link->irq.possible_count) {
494            int penalty =
495                PIRQ_PENALTY_PCI_POSSIBLE /
496                link->irq.possible_count;
497
498            for (i = 0; i < link->irq.possible_count; i++) {
499                if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
500                    acpi_irq_penalty[link->irq.
501                             possible[i]] +=
502                        penalty;
503            }
504
505        } else if (link->irq.active) {
506            acpi_irq_penalty[link->irq.active] +=
507                PIRQ_PENALTY_PCI_POSSIBLE;
508        }
509    }
510    /* Add a penalty for the SCI */
511    acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
512    return 0;
513}
514
515static int acpi_irq_balance = -1; /* 0: static, 1: balance */
516
517static int acpi_pci_link_allocate(struct acpi_pci_link *link)
518{
519    int irq;
520    int i;
521
522    if (link->irq.initialized) {
523        if (link->refcnt == 0)
524            /* This means the link is disabled but initialized */
525            acpi_pci_link_set(link, link->irq.active);
526        return 0;
527    }
528
529    /*
530     * search for active IRQ in list of possible IRQs.
531     */
532    for (i = 0; i < link->irq.possible_count; ++i) {
533        if (link->irq.active == link->irq.possible[i])
534            break;
535    }
536    /*
537     * forget active IRQ that is not in possible list
538     */
539    if (i == link->irq.possible_count) {
540        if (acpi_strict)
541            printk(KERN_WARNING PREFIX "_CRS %d not found"
542                      " in _PRS\n", link->irq.active);
543        link->irq.active = 0;
544    }
545
546    /*
547     * if active found, use it; else pick entry from end of possible list.
548     */
549    if (link->irq.active)
550        irq = link->irq.active;
551    else
552        irq = link->irq.possible[link->irq.possible_count - 1];
553
554    if (acpi_irq_balance || !link->irq.active) {
555        /*
556         * Select the best IRQ. This is done in reverse to promote
557         * the use of IRQs 9, 10, 11, and >15.
558         */
559        for (i = (link->irq.possible_count - 1); i >= 0; i--) {
560            if (acpi_irq_penalty[irq] >
561                acpi_irq_penalty[link->irq.possible[i]])
562                irq = link->irq.possible[i];
563        }
564    }
565
566    /* Attempt to enable the link device at this IRQ. */
567    if (acpi_pci_link_set(link, irq)) {
568        printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
569                "Try pci=noacpi or acpi=off\n",
570                acpi_device_name(link->device),
571                acpi_device_bid(link->device));
572        return -ENODEV;
573    } else {
574        acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
575        printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
576               acpi_device_name(link->device),
577               acpi_device_bid(link->device), link->irq.active);
578    }
579
580    link->irq.initialized = 1;
581    return 0;
582}
583
584/*
585 * acpi_pci_link_allocate_irq
586 * success: return IRQ >= 0
587 * failure: return -1
588 */
589int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
590                   int *polarity, char **name)
591{
592    int result;
593    struct acpi_device *device;
594    struct acpi_pci_link *link;
595
596    result = acpi_bus_get_device(handle, &device);
597    if (result) {
598        printk(KERN_ERR PREFIX "Invalid link device\n");
599        return -1;
600    }
601
602    link = acpi_driver_data(device);
603    if (!link) {
604        printk(KERN_ERR PREFIX "Invalid link context\n");
605        return -1;
606    }
607
608    /* TBD: Support multiple index (IRQ) entries per Link Device */
609    if (index) {
610        printk(KERN_ERR PREFIX "Invalid index %d\n", index);
611        return -1;
612    }
613
614    mutex_lock(&acpi_link_lock);
615    if (acpi_pci_link_allocate(link)) {
616        mutex_unlock(&acpi_link_lock);
617        return -1;
618    }
619
620    if (!link->irq.active) {
621        mutex_unlock(&acpi_link_lock);
622        printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
623        return -1;
624    }
625    link->refcnt++;
626    mutex_unlock(&acpi_link_lock);
627
628    if (triggering)
629        *triggering = link->irq.triggering;
630    if (polarity)
631        *polarity = link->irq.polarity;
632    if (name)
633        *name = acpi_device_bid(link->device);
634    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
635              "Link %s is referenced\n",
636              acpi_device_bid(link->device)));
637    return (link->irq.active);
638}
639
640/*
641 * We don't change link's irq information here. After it is reenabled, we
642 * continue use the info
643 */
644int acpi_pci_link_free_irq(acpi_handle handle)
645{
646    struct acpi_device *device;
647    struct acpi_pci_link *link;
648    acpi_status result;
649
650    result = acpi_bus_get_device(handle, &device);
651    if (result) {
652        printk(KERN_ERR PREFIX "Invalid link device\n");
653        return -1;
654    }
655
656    link = acpi_driver_data(device);
657    if (!link) {
658        printk(KERN_ERR PREFIX "Invalid link context\n");
659        return -1;
660    }
661
662    mutex_lock(&acpi_link_lock);
663    if (!link->irq.initialized) {
664        mutex_unlock(&acpi_link_lock);
665        printk(KERN_ERR PREFIX "Link isn't initialized\n");
666        return -1;
667    }
668#ifdef FUTURE_USE
669    /*
670     * The Link reference count allows us to _DISable an unused link
671     * and suspend time, and set it again on resume.
672     * However, 2.6.12 still has irq_router.resume
673     * which blindly restores the link state.
674     * So we disable the reference count method
675     * to prevent duplicate acpi_pci_link_set()
676     * which would harm some systems
677     */
678    link->refcnt--;
679#endif
680    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
681              "Link %s is dereferenced\n",
682              acpi_device_bid(link->device)));
683
684    if (link->refcnt == 0)
685        acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
686
687    mutex_unlock(&acpi_link_lock);
688    return (link->irq.active);
689}
690
691/* --------------------------------------------------------------------------
692                                 Driver Interface
693   -------------------------------------------------------------------------- */
694
695static int acpi_pci_link_add(struct acpi_device *device)
696{
697    int result;
698    struct acpi_pci_link *link;
699    int i;
700    int found = 0;
701
702    link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
703    if (!link)
704        return -ENOMEM;
705
706    link->device = device;
707    strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
708    strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
709    device->driver_data = link;
710
711    mutex_lock(&acpi_link_lock);
712    result = acpi_pci_link_get_possible(link);
713    if (result)
714        goto end;
715
716    /* query and set link->irq.active */
717    acpi_pci_link_get_current(link);
718
719    printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
720           acpi_device_bid(device));
721    for (i = 0; i < link->irq.possible_count; i++) {
722        if (link->irq.active == link->irq.possible[i]) {
723            printk(KERN_CONT " *%d", link->irq.possible[i]);
724            found = 1;
725        } else
726            printk(KERN_CONT " %d", link->irq.possible[i]);
727    }
728
729    printk(KERN_CONT ")");
730
731    if (!found)
732        printk(KERN_CONT " *%d", link->irq.active);
733
734    if (!link->device->status.enabled)
735        printk(KERN_CONT ", disabled.");
736
737    printk(KERN_CONT "\n");
738
739    list_add_tail(&link->list, &acpi_link_list);
740
741      end:
742    /* disable all links -- to be activated on use */
743    acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
744    mutex_unlock(&acpi_link_lock);
745
746    if (result)
747        kfree(link);
748
749    return result;
750}
751
752static int acpi_pci_link_resume(struct acpi_pci_link *link)
753{
754    if (link->refcnt && link->irq.active && link->irq.initialized)
755        return (acpi_pci_link_set(link, link->irq.active));
756
757    return 0;
758}
759
760static void irqrouter_resume(void)
761{
762    struct acpi_pci_link *link;
763
764    list_for_each_entry(link, &acpi_link_list, list) {
765        acpi_pci_link_resume(link);
766    }
767}
768
769static int acpi_pci_link_remove(struct acpi_device *device, int type)
770{
771    struct acpi_pci_link *link;
772
773    link = acpi_driver_data(device);
774
775    mutex_lock(&acpi_link_lock);
776    list_del(&link->list);
777    mutex_unlock(&acpi_link_lock);
778
779    kfree(link);
780    return 0;
781}
782
783/*
784 * modify acpi_irq_penalty[] from cmdline
785 */
786static int __init acpi_irq_penalty_update(char *str, int used)
787{
788    int i;
789
790    for (i = 0; i < 16; i++) {
791        int retval;
792        int irq;
793
794        retval = get_option(&str, &irq);
795
796        if (!retval)
797            break; /* no number found */
798
799        if (irq < 0)
800            continue;
801
802        if (irq >= ARRAY_SIZE(acpi_irq_penalty))
803            continue;
804
805        if (used)
806            acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
807        else
808            acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
809
810        if (retval != 2) /* no next number */
811            break;
812    }
813    return 1;
814}
815
816/*
817 * We'd like PNP to call this routine for the
818 * single ISA_USED value for each legacy device.
819 * But instead it calls us with each POSSIBLE setting.
820 * There is no ISA_POSSIBLE weight, so we simply use
821 * the (small) PCI_USING penalty.
822 */
823void acpi_penalize_isa_irq(int irq, int active)
824{
825    if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
826        if (active)
827            acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
828        else
829            acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
830    }
831}
832
833/*
834 * Over-ride default table to reserve additional IRQs for use by ISA
835 * e.g. acpi_irq_isa=5
836 * Useful for telling ACPI how not to interfere with your ISA sound card.
837 */
838static int __init acpi_irq_isa(char *str)
839{
840    return acpi_irq_penalty_update(str, 1);
841}
842
843__setup("acpi_irq_isa=", acpi_irq_isa);
844
845/*
846 * Over-ride default table to free additional IRQs for use by PCI
847 * e.g. acpi_irq_pci=7,15
848 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
849 */
850static int __init acpi_irq_pci(char *str)
851{
852    return acpi_irq_penalty_update(str, 0);
853}
854
855__setup("acpi_irq_pci=", acpi_irq_pci);
856
857static int __init acpi_irq_nobalance_set(char *str)
858{
859    acpi_irq_balance = 0;
860    return 1;
861}
862
863__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
864
865static int __init acpi_irq_balance_set(char *str)
866{
867    acpi_irq_balance = 1;
868    return 1;
869}
870
871__setup("acpi_irq_balance", acpi_irq_balance_set);
872
873static struct syscore_ops irqrouter_syscore_ops = {
874    .resume = irqrouter_resume,
875};
876
877static int __init irqrouter_init_ops(void)
878{
879    if (!acpi_disabled && !acpi_noirq)
880        register_syscore_ops(&irqrouter_syscore_ops);
881
882    return 0;
883}
884
885device_initcall(irqrouter_init_ops);
886
887static int __init acpi_pci_link_init(void)
888{
889    if (acpi_noirq)
890        return 0;
891
892    if (acpi_irq_balance == -1) {
893        /* no command line switch: enable balancing in IOAPIC mode */
894        if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
895            acpi_irq_balance = 1;
896        else
897            acpi_irq_balance = 0;
898    }
899
900    if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
901        return -ENODEV;
902
903    return 0;
904}
905
906subsys_initcall(acpi_pci_link_init);
907

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