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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/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/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 | |
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 | |
55 | ||
56 | static int acpi_pci_link_add(struct acpi_device *device); | |
57 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
58 | ||
59 | static const struct acpi_device_id link_device_ids[] = { | |
60 | {"PNP0C0F", 0}, | |
61 | {"", 0}, | |
62 | }; | |
63 | MODULE_DEVICE_TABLE(acpi, link_device_ids); | |
64 | ||
65 | static 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 | */ | |
79 | struct 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 | ||
90 | struct 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 | ||
97 | static LIST_HEAD(acpi_link_list); | |
98 | static 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 | */ | |
107 | static 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 | ||
177 | static 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 | ||
195 | static 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 | */ | |
252 | static 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 | ||
300 | static 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 | ||
459 | static 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 | ||
479 | int __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 | ||
515 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ | |
516 | ||
517 | static 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 | */ | |
589 | int 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 | */ | |
644 | int 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 | ||
695 | static 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(" *%d", link->irq.possible[i]); | |
724 | found = 1; | |
725 | } else | |
726 | printk(" %d", link->irq.possible[i]); | |
727 | } | |
728 | ||
729 | printk(")"); | |
730 | ||
731 | if (!found) | |
732 | printk(" *%d", link->irq.active); | |
733 | ||
734 | if (!link->device->status.enabled) | |
735 | printk(", disabled."); | |
736 | ||
737 | printk("\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 | ||
752 | static 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 | ||
760 | static int irqrouter_resume(struct sys_device *dev) | |
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 | return 0; | |
768 | } | |
769 | ||
770 | static int acpi_pci_link_remove(struct acpi_device *device, int type) | |
771 | { | |
772 | struct acpi_pci_link *link; | |
773 | ||
774 | link = acpi_driver_data(device); | |
775 | ||
776 | mutex_lock(&acpi_link_lock); | |
777 | list_del(&link->list); | |
778 | mutex_unlock(&acpi_link_lock); | |
779 | ||
780 | kfree(link); | |
781 | return 0; | |
782 | } | |
783 | ||
784 | /* | |
785 | * modify acpi_irq_penalty[] from cmdline | |
786 | */ | |
787 | static int __init acpi_irq_penalty_update(char *str, int used) | |
788 | { | |
789 | int i; | |
790 | ||
791 | for (i = 0; i < 16; i++) { | |
792 | int retval; | |
793 | int irq; | |
794 | ||
795 | retval = get_option(&str, &irq); | |
796 | ||
797 | if (!retval) | |
798 | break; /* no number found */ | |
799 | ||
800 | if (irq < 0) | |
801 | continue; | |
802 | ||
803 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) | |
804 | continue; | |
805 | ||
806 | if (used) | |
807 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
808 | else | |
809 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
810 | ||
811 | if (retval != 2) /* no next number */ | |
812 | break; | |
813 | } | |
814 | return 1; | |
815 | } | |
816 | ||
817 | /* | |
818 | * We'd like PNP to call this routine for the | |
819 | * single ISA_USED value for each legacy device. | |
820 | * But instead it calls us with each POSSIBLE setting. | |
821 | * There is no ISA_POSSIBLE weight, so we simply use | |
822 | * the (small) PCI_USING penalty. | |
823 | */ | |
824 | void acpi_penalize_isa_irq(int irq, int active) | |
825 | { | |
826 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { | |
827 | if (active) | |
828 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
829 | else | |
830 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
831 | } | |
832 | } | |
833 | ||
834 | /* | |
835 | * Over-ride default table to reserve additional IRQs for use by ISA | |
836 | * e.g. acpi_irq_isa=5 | |
837 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
838 | */ | |
839 | static int __init acpi_irq_isa(char *str) | |
840 | { | |
841 | return acpi_irq_penalty_update(str, 1); | |
842 | } | |
843 | ||
844 | __setup("acpi_irq_isa=", acpi_irq_isa); | |
845 | ||
846 | /* | |
847 | * Over-ride default table to free additional IRQs for use by PCI | |
848 | * e.g. acpi_irq_pci=7,15 | |
849 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
850 | */ | |
851 | static int __init acpi_irq_pci(char *str) | |
852 | { | |
853 | return acpi_irq_penalty_update(str, 0); | |
854 | } | |
855 | ||
856 | __setup("acpi_irq_pci=", acpi_irq_pci); | |
857 | ||
858 | static int __init acpi_irq_nobalance_set(char *str) | |
859 | { | |
860 | acpi_irq_balance = 0; | |
861 | return 1; | |
862 | } | |
863 | ||
864 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); | |
865 | ||
866 | static int __init acpi_irq_balance_set(char *str) | |
867 | { | |
868 | acpi_irq_balance = 1; | |
869 | return 1; | |
870 | } | |
871 | ||
872 | __setup("acpi_irq_balance", acpi_irq_balance_set); | |
873 | ||
874 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ | |
875 | static struct sysdev_class irqrouter_sysdev_class = { | |
876 | .name = "irqrouter", | |
877 | .resume = irqrouter_resume, | |
878 | }; | |
879 | ||
880 | static struct sys_device device_irqrouter = { | |
881 | .id = 0, | |
882 | .cls = &irqrouter_sysdev_class, | |
883 | }; | |
884 | ||
885 | static int __init irqrouter_init_sysfs(void) | |
886 | { | |
887 | int error; | |
888 | ||
889 | if (acpi_disabled || acpi_noirq) | |
890 | return 0; | |
891 | ||
892 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
893 | if (!error) | |
894 | error = sysdev_register(&device_irqrouter); | |
895 | ||
896 | return error; | |
897 | } | |
898 | ||
899 | device_initcall(irqrouter_init_sysfs); | |
900 | ||
901 | static int __init acpi_pci_link_init(void) | |
902 | { | |
903 | if (acpi_noirq) | |
904 | return 0; | |
905 | ||
906 | if (acpi_irq_balance == -1) { | |
907 | /* no command line switch: enable balancing in IOAPIC mode */ | |
908 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
909 | acpi_irq_balance = 1; | |
910 | else | |
911 | acpi_irq_balance = 0; | |
912 | } | |
913 | ||
914 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
915 | return -ENODEV; | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | subsys_initcall(acpi_pci_link_init); |