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1da177e4 LT |
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/proc_fs.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/pm.h> | |
40 | #include <linux/pci.h> | |
41 | ||
42 | #include <acpi/acpi_bus.h> | |
43 | #include <acpi/acpi_drivers.h> | |
44 | ||
1da177e4 | 45 | #define _COMPONENT ACPI_PCI_COMPONENT |
4be44fcd | 46 | ACPI_MODULE_NAME("pci_link") |
1da177e4 LT |
47 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
48 | #define ACPI_PCI_LINK_HID "PNP0C0F" | |
49 | #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" | |
50 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" | |
51 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
52 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1da177e4 | 53 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
4be44fcd LB |
54 | static int acpi_pci_link_add(struct acpi_device *device); |
55 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
56 | |
57 | static struct acpi_driver acpi_pci_link_driver = { | |
4be44fcd LB |
58 | .name = ACPI_PCI_LINK_DRIVER_NAME, |
59 | .class = ACPI_PCI_LINK_CLASS, | |
60 | .ids = ACPI_PCI_LINK_HID, | |
61 | .ops = { | |
62 | .add = acpi_pci_link_add, | |
63 | .remove = acpi_pci_link_remove, | |
64 | }, | |
1da177e4 LT |
65 | }; |
66 | ||
87bec66b DSL |
67 | /* |
68 | * If a link is initialized, we never change its active and initialized | |
69 | * later even the link is disable. Instead, we just repick the active irq | |
70 | */ | |
1da177e4 | 71 | struct acpi_pci_link_irq { |
4be44fcd | 72 | u8 active; /* Current IRQ */ |
50eca3eb BM |
73 | u8 triggering; /* All IRQs */ |
74 | u8 polarity; /* All IRQs */ | |
4be44fcd LB |
75 | u8 resource_type; |
76 | u8 possible_count; | |
77 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
78 | u8 initialized:1; | |
79 | u8 reserved:7; | |
1da177e4 LT |
80 | }; |
81 | ||
82 | struct acpi_pci_link { | |
4be44fcd LB |
83 | struct list_head node; |
84 | struct acpi_device *device; | |
85 | acpi_handle handle; | |
1da177e4 | 86 | struct acpi_pci_link_irq irq; |
4be44fcd | 87 | int refcnt; |
1da177e4 LT |
88 | }; |
89 | ||
90 | static struct { | |
4be44fcd LB |
91 | int count; |
92 | struct list_head entries; | |
93 | } acpi_link; | |
87bec66b | 94 | DECLARE_MUTEX(acpi_link_lock); |
1da177e4 | 95 | |
1da177e4 LT |
96 | /* -------------------------------------------------------------------------- |
97 | PCI Link Device Management | |
98 | -------------------------------------------------------------------------- */ | |
99 | ||
100 | /* | |
101 | * set context (link) possible list from resource list | |
102 | */ | |
103 | static acpi_status | |
4be44fcd | 104 | acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) |
1da177e4 | 105 | { |
4be44fcd LB |
106 | struct acpi_pci_link *link = (struct acpi_pci_link *)context; |
107 | u32 i = 0; | |
1da177e4 LT |
108 | |
109 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); | |
110 | ||
eca008c8 | 111 | switch (resource->type) { |
50eca3eb | 112 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
1da177e4 | 113 | return_ACPI_STATUS(AE_OK); |
50eca3eb | 114 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
115 | { |
116 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 117 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
118 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
119 | "Blank IRQ resource\n")); | |
120 | return_ACPI_STATUS(AE_OK); | |
1da177e4 | 121 | } |
4be44fcd | 122 | for (i = 0; |
50eca3eb | 123 | (i < p->interrupt_count |
4be44fcd LB |
124 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
125 | if (!p->interrupts[i]) { | |
126 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
127 | "Invalid IRQ %d\n", | |
128 | p->interrupts[i])); | |
129 | continue; | |
130 | } | |
131 | link->irq.possible[i] = p->interrupts[i]; | |
132 | link->irq.possible_count++; | |
133 | } | |
50eca3eb BM |
134 | link->irq.triggering = p->triggering; |
135 | link->irq.polarity = p->polarity; | |
136 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 137 | break; |
1da177e4 | 138 | } |
50eca3eb | 139 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 140 | { |
50eca3eb | 141 | struct acpi_resource_extended_irq *p = |
4be44fcd | 142 | &resource->data.extended_irq; |
50eca3eb | 143 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
144 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
145 | "Blank EXT IRQ resource\n")); | |
146 | return_ACPI_STATUS(AE_OK); | |
147 | } | |
148 | for (i = 0; | |
50eca3eb | 149 | (i < p->interrupt_count |
4be44fcd LB |
150 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
151 | if (!p->interrupts[i]) { | |
152 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
153 | "Invalid IRQ %d\n", | |
154 | p->interrupts[i])); | |
155 | continue; | |
156 | } | |
157 | link->irq.possible[i] = p->interrupts[i]; | |
158 | link->irq.possible_count++; | |
1da177e4 | 159 | } |
50eca3eb BM |
160 | link->irq.triggering = p->triggering; |
161 | link->irq.polarity = p->polarity; | |
162 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 163 | break; |
1da177e4 | 164 | } |
1da177e4 | 165 | default: |
4be44fcd LB |
166 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
167 | "Resource is not an IRQ entry\n")); | |
1da177e4 LT |
168 | return_ACPI_STATUS(AE_OK); |
169 | } | |
170 | ||
171 | return_ACPI_STATUS(AE_CTRL_TERMINATE); | |
172 | } | |
173 | ||
4be44fcd | 174 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 175 | { |
4be44fcd | 176 | acpi_status status; |
1da177e4 LT |
177 | |
178 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); | |
179 | ||
180 | if (!link) | |
181 | return_VALUE(-EINVAL); | |
182 | ||
183 | status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, | |
4be44fcd | 184 | acpi_pci_link_check_possible, link); |
1da177e4 LT |
185 | if (ACPI_FAILURE(status)) { |
186 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n")); | |
187 | return_VALUE(-ENODEV); | |
188 | } | |
189 | ||
4be44fcd LB |
190 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
191 | "Found %d possible IRQs\n", | |
192 | link->irq.possible_count)); | |
1da177e4 LT |
193 | |
194 | return_VALUE(0); | |
195 | } | |
196 | ||
1da177e4 | 197 | static acpi_status |
4be44fcd | 198 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 199 | { |
4be44fcd | 200 | int *irq = (int *)context; |
1da177e4 LT |
201 | |
202 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); | |
203 | ||
eca008c8 | 204 | switch (resource->type) { |
50eca3eb | 205 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
206 | { |
207 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 208 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
209 | /* |
210 | * IRQ descriptors may have no IRQ# bits set, | |
211 | * particularly those those w/ _STA disabled | |
212 | */ | |
213 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
214 | "Blank IRQ resource\n")); | |
215 | return_ACPI_STATUS(AE_OK); | |
216 | } | |
217 | *irq = p->interrupts[0]; | |
218 | break; | |
1da177e4 | 219 | } |
50eca3eb | 220 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 221 | { |
50eca3eb | 222 | struct acpi_resource_extended_irq *p = |
4be44fcd | 223 | &resource->data.extended_irq; |
50eca3eb | 224 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
225 | /* |
226 | * extended IRQ descriptors must | |
227 | * return at least 1 IRQ | |
228 | */ | |
229 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
230 | "Blank EXT IRQ resource\n")); | |
231 | return_ACPI_STATUS(AE_OK); | |
232 | } | |
233 | *irq = p->interrupts[0]; | |
234 | break; | |
1da177e4 | 235 | } |
d4ec6c7c | 236 | break; |
1da177e4 | 237 | default: |
d4ec6c7c LB |
238 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource %d isn't an IRQ\n", resource->type)); |
239 | case ACPI_RESOURCE_TYPE_END_TAG: | |
1da177e4 LT |
240 | return_ACPI_STATUS(AE_OK); |
241 | } | |
242 | return_ACPI_STATUS(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 | */ | |
4be44fcd | 252 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 253 | { |
4be44fcd LB |
254 | int result = 0; |
255 | acpi_status status = AE_OK; | |
256 | int irq = 0; | |
1da177e4 LT |
257 | |
258 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); | |
259 | ||
260 | if (!link || !link->handle) | |
261 | return_VALUE(-EINVAL); | |
262 | ||
263 | link->irq.active = 0; | |
264 | ||
265 | /* in practice, status disabled is meaningless, ignore it */ | |
266 | if (acpi_strict) { | |
267 | /* Query _STA, set link->device->status */ | |
268 | result = acpi_bus_get_status(link->device); | |
269 | if (result) { | |
4be44fcd LB |
270 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
271 | "Unable to read status\n")); | |
1da177e4 LT |
272 | goto end; |
273 | } | |
274 | ||
275 | if (!link->device->status.enabled) { | |
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
277 | return_VALUE(0); | |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * Query and parse _CRS to get the current IRQ assignment. | |
283 | */ | |
284 | ||
285 | status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, | |
4be44fcd | 286 | acpi_pci_link_check_current, &irq); |
1da177e4 LT |
287 | if (ACPI_FAILURE(status)) { |
288 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n")); | |
289 | result = -ENODEV; | |
290 | goto end; | |
291 | } | |
292 | ||
293 | if (acpi_strict && !irq) { | |
294 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n")); | |
295 | result = -ENODEV; | |
296 | } | |
297 | ||
298 | link->irq.active = irq; | |
299 | ||
300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
301 | ||
4be44fcd | 302 | end: |
1da177e4 LT |
303 | return_VALUE(result); |
304 | } | |
305 | ||
4be44fcd | 306 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 307 | { |
4be44fcd LB |
308 | int result = 0; |
309 | acpi_status status = AE_OK; | |
1da177e4 | 310 | struct { |
4be44fcd LB |
311 | struct acpi_resource res; |
312 | struct acpi_resource end; | |
313 | } *resource; | |
314 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 LT |
315 | |
316 | ACPI_FUNCTION_TRACE("acpi_pci_link_set"); | |
317 | ||
318 | if (!link || !irq) | |
319 | return_VALUE(-EINVAL); | |
320 | ||
a64882e7 | 321 | resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); |
4be44fcd | 322 | if (!resource) |
1da177e4 LT |
323 | return_VALUE(-ENOMEM); |
324 | ||
4be44fcd LB |
325 | memset(resource, 0, sizeof(*resource) + 1); |
326 | buffer.length = sizeof(*resource) + 1; | |
1da177e4 LT |
327 | buffer.pointer = resource; |
328 | ||
4be44fcd | 329 | switch (link->irq.resource_type) { |
50eca3eb BM |
330 | case ACPI_RESOURCE_TYPE_IRQ: |
331 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 332 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
333 | resource->res.data.irq.triggering = link->irq.triggering; |
334 | resource->res.data.irq.polarity = | |
335 | link->irq.polarity; | |
336 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
337 | resource->res.data.irq.sharable = | |
4be44fcd | 338 | ACPI_EXCLUSIVE; |
1da177e4 | 339 | else |
50eca3eb BM |
340 | resource->res.data.irq.sharable = ACPI_SHARED; |
341 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
342 | resource->res.data.irq.interrupts[0] = irq; |
343 | break; | |
4be44fcd | 344 | |
50eca3eb BM |
345 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
346 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 347 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
348 | resource->res.data.extended_irq.producer_consumer = |
349 | ACPI_CONSUMER; | |
50eca3eb BM |
350 | resource->res.data.extended_irq.triggering = |
351 | link->irq.triggering; | |
352 | resource->res.data.extended_irq.polarity = | |
353 | link->irq.polarity; | |
354 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
355 | resource->res.data.irq.sharable = | |
4be44fcd | 356 | ACPI_EXCLUSIVE; |
1da177e4 | 357 | else |
50eca3eb BM |
358 | resource->res.data.irq.sharable = ACPI_SHARED; |
359 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
360 | resource->res.data.extended_irq.interrupts[0] = irq; |
361 | /* ignore resource_source, it's optional */ | |
362 | break; | |
363 | default: | |
364 | printk("ACPI BUG: resource_type %d\n", link->irq.resource_type); | |
365 | result = -EINVAL; | |
366 | goto end; | |
367 | ||
368 | } | |
50eca3eb | 369 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
370 | |
371 | /* Attempt to set the resource */ | |
372 | status = acpi_set_current_resources(link->handle, &buffer); | |
373 | ||
374 | /* check for total failure */ | |
375 | if (ACPI_FAILURE(status)) { | |
376 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n")); | |
377 | result = -ENODEV; | |
378 | goto end; | |
379 | } | |
380 | ||
381 | /* Query _STA, set device->status */ | |
382 | result = acpi_bus_get_status(link->device); | |
383 | if (result) { | |
384 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); | |
385 | goto end; | |
386 | } | |
387 | if (!link->device->status.enabled) { | |
388 | printk(KERN_WARNING PREFIX | |
4be44fcd LB |
389 | "%s [%s] disabled and referenced, BIOS bug.\n", |
390 | acpi_device_name(link->device), | |
391 | acpi_device_bid(link->device)); | |
1da177e4 LT |
392 | } |
393 | ||
394 | /* Query _CRS, set link->irq.active */ | |
395 | result = acpi_pci_link_get_current(link); | |
396 | if (result) { | |
397 | goto end; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Is current setting not what we set? | |
402 | * set link->irq.active | |
403 | */ | |
404 | if (link->irq.active != irq) { | |
405 | /* | |
406 | * policy: when _CRS doesn't return what we just _SRS | |
407 | * assume _SRS worked and override _CRS value. | |
408 | */ | |
4be44fcd LB |
409 | printk(KERN_WARNING PREFIX |
410 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
411 | acpi_device_name(link->device), | |
412 | acpi_device_bid(link->device), link->irq.active, irq); | |
1da177e4 LT |
413 | link->irq.active = irq; |
414 | } | |
415 | ||
416 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
417 | |
418 | end: | |
1da177e4 LT |
419 | kfree(resource); |
420 | return_VALUE(result); | |
421 | } | |
422 | ||
1da177e4 LT |
423 | /* -------------------------------------------------------------------------- |
424 | PCI Link IRQ Management | |
425 | -------------------------------------------------------------------------- */ | |
426 | ||
427 | /* | |
428 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
429 | * Link Devices to move the PIRQs around to minimize sharing. | |
430 | * | |
431 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
432 | * that the BIOS has already set to active. This is necessary because | |
433 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
434 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
435 | * even if acpi_irq_nobalance is set. | |
436 | * | |
437 | * A tables of penalties avoids directing PCI interrupts to well known | |
438 | * ISA IRQs. Boot params are available to over-ride the default table: | |
439 | * | |
440 | * List interrupts that are free for PCI use. | |
441 | * acpi_irq_pci=n[,m] | |
442 | * | |
443 | * List interrupts that should not be used for PCI: | |
444 | * acpi_irq_isa=n[,m] | |
445 | * | |
446 | * Note that PCI IRQ routers have a list of possible IRQs, | |
447 | * which may not include the IRQs this table says are available. | |
448 | * | |
449 | * Since this heuristic can't tell the difference between a link | |
450 | * that no device will attach to, vs. a link which may be shared | |
451 | * by multiple active devices -- it is not optimal. | |
452 | * | |
453 | * If interrupt performance is that important, get an IO-APIC system | |
454 | * with a pin dedicated to each device. Or for that matter, an MSI | |
455 | * enabled system. | |
456 | */ | |
457 | ||
458 | #define ACPI_MAX_IRQS 256 | |
459 | #define ACPI_MAX_ISA_IRQ 16 | |
460 | ||
461 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
462 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
463 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
464 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
465 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
466 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
467 | ||
468 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
469 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
470 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
471 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
472 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
473 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
474 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
475 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
476 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
477 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
478 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
479 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
480 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
481 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ | |
482 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
483 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
484 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 485 | /* >IRQ15 */ |
1da177e4 LT |
486 | }; |
487 | ||
4be44fcd | 488 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 489 | { |
4be44fcd LB |
490 | struct list_head *node = NULL; |
491 | struct acpi_pci_link *link = NULL; | |
492 | int i = 0; | |
1da177e4 LT |
493 | |
494 | ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); | |
495 | ||
496 | /* | |
497 | * Update penalties to facilitate IRQ balancing. | |
498 | */ | |
499 | list_for_each(node, &acpi_link.entries) { | |
500 | ||
501 | link = list_entry(node, struct acpi_pci_link, node); | |
502 | if (!link) { | |
4be44fcd LB |
503 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
504 | "Invalid link context\n")); | |
1da177e4 LT |
505 | continue; |
506 | } | |
507 | ||
508 | /* | |
509 | * reflect the possible and active irqs in the penalty table -- | |
510 | * useful for breaking ties. | |
511 | */ | |
512 | if (link->irq.possible_count) { | |
4be44fcd LB |
513 | int penalty = |
514 | PIRQ_PENALTY_PCI_POSSIBLE / | |
515 | link->irq.possible_count; | |
1da177e4 LT |
516 | |
517 | for (i = 0; i < link->irq.possible_count; i++) { | |
518 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
519 | acpi_irq_penalty[link->irq. |
520 | possible[i]] += | |
521 | penalty; | |
1da177e4 LT |
522 | } |
523 | ||
524 | } else if (link->irq.active) { | |
4be44fcd LB |
525 | acpi_irq_penalty[link->irq.active] += |
526 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
527 | } |
528 | } | |
529 | /* Add a penalty for the SCI */ | |
530 | acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; | |
531 | ||
532 | return_VALUE(0); | |
533 | } | |
534 | ||
535 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
536 | ||
4be44fcd | 537 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 538 | { |
4be44fcd LB |
539 | int irq; |
540 | int i; | |
1da177e4 LT |
541 | |
542 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); | |
543 | ||
87bec66b DSL |
544 | if (link->irq.initialized) { |
545 | if (link->refcnt == 0) | |
546 | /* This means the link is disabled but initialized */ | |
547 | acpi_pci_link_set(link, link->irq.active); | |
1da177e4 | 548 | return_VALUE(0); |
87bec66b | 549 | } |
1da177e4 LT |
550 | |
551 | /* | |
552 | * search for active IRQ in list of possible IRQs. | |
553 | */ | |
554 | for (i = 0; i < link->irq.possible_count; ++i) { | |
555 | if (link->irq.active == link->irq.possible[i]) | |
556 | break; | |
557 | } | |
558 | /* | |
559 | * forget active IRQ that is not in possible list | |
560 | */ | |
561 | if (i == link->irq.possible_count) { | |
562 | if (acpi_strict) | |
563 | printk(KERN_WARNING PREFIX "_CRS %d not found" | |
4be44fcd | 564 | " in _PRS\n", link->irq.active); |
1da177e4 LT |
565 | link->irq.active = 0; |
566 | } | |
567 | ||
568 | /* | |
569 | * if active found, use it; else pick entry from end of possible list. | |
570 | */ | |
571 | if (link->irq.active) { | |
572 | irq = link->irq.active; | |
573 | } else { | |
574 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
575 | } | |
576 | ||
577 | if (acpi_irq_balance || !link->irq.active) { | |
578 | /* | |
579 | * Select the best IRQ. This is done in reverse to promote | |
580 | * the use of IRQs 9, 10, 11, and >15. | |
581 | */ | |
582 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
583 | if (acpi_irq_penalty[irq] > |
584 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
585 | irq = link->irq.possible[i]; |
586 | } | |
587 | } | |
588 | ||
589 | /* Attempt to enable the link device at this IRQ. */ | |
590 | if (acpi_pci_link_set(link, irq)) { | |
4be44fcd LB |
591 | printk(PREFIX |
592 | "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n" | |
593 | "Try pci=noacpi or acpi=off\n", | |
594 | acpi_device_name(link->device), | |
595 | acpi_device_bid(link->device)); | |
1da177e4 LT |
596 | return_VALUE(-ENODEV); |
597 | } else { | |
598 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
599 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
600 | acpi_device_name(link->device), | |
601 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
602 | } |
603 | ||
604 | link->irq.initialized = 1; | |
605 | ||
606 | return_VALUE(0); | |
607 | } | |
608 | ||
609 | /* | |
87bec66b | 610 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
611 | * success: return IRQ >= 0 |
612 | * failure: return -1 | |
613 | */ | |
614 | ||
615 | int | |
4be44fcd LB |
616 | acpi_pci_link_allocate_irq(acpi_handle handle, |
617 | int index, | |
50eca3eb | 618 | int *triggering, int *polarity, char **name) |
1da177e4 | 619 | { |
4be44fcd LB |
620 | int result = 0; |
621 | struct acpi_device *device = NULL; | |
622 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 623 | |
87bec66b | 624 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq"); |
1da177e4 LT |
625 | |
626 | result = acpi_bus_get_device(handle, &device); | |
627 | if (result) { | |
628 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); | |
629 | return_VALUE(-1); | |
630 | } | |
631 | ||
4be44fcd | 632 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 LT |
633 | if (!link) { |
634 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); | |
635 | return_VALUE(-1); | |
636 | } | |
637 | ||
638 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
639 | if (index) { | |
640 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index)); | |
641 | return_VALUE(-1); | |
642 | } | |
643 | ||
87bec66b DSL |
644 | down(&acpi_link_lock); |
645 | if (acpi_pci_link_allocate(link)) { | |
646 | up(&acpi_link_lock); | |
1da177e4 | 647 | return_VALUE(-1); |
87bec66b | 648 | } |
4be44fcd | 649 | |
1da177e4 | 650 | if (!link->irq.active) { |
87bec66b | 651 | up(&acpi_link_lock); |
1da177e4 LT |
652 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n")); |
653 | return_VALUE(-1); | |
654 | } | |
4be44fcd | 655 | link->refcnt++; |
87bec66b | 656 | up(&acpi_link_lock); |
1da177e4 | 657 | |
50eca3eb BM |
658 | if (triggering) |
659 | *triggering = link->irq.triggering; | |
660 | if (polarity) | |
661 | *polarity = link->irq.polarity; | |
4be44fcd LB |
662 | if (name) |
663 | *name = acpi_device_bid(link->device); | |
87bec66b | 664 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
665 | "Link %s is referenced\n", |
666 | acpi_device_bid(link->device))); | |
1da177e4 LT |
667 | return_VALUE(link->irq.active); |
668 | } | |
669 | ||
87bec66b DSL |
670 | /* |
671 | * We don't change link's irq information here. After it is reenabled, we | |
672 | * continue use the info | |
673 | */ | |
4be44fcd | 674 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 675 | { |
4be44fcd LB |
676 | struct acpi_device *device = NULL; |
677 | struct acpi_pci_link *link = NULL; | |
678 | acpi_status result; | |
87bec66b DSL |
679 | |
680 | ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq"); | |
681 | ||
682 | result = acpi_bus_get_device(handle, &device); | |
683 | if (result) { | |
684 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); | |
685 | return_VALUE(-1); | |
686 | } | |
1da177e4 | 687 | |
4be44fcd | 688 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
87bec66b DSL |
689 | if (!link) { |
690 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); | |
691 | return_VALUE(-1); | |
692 | } | |
693 | ||
694 | down(&acpi_link_lock); | |
695 | if (!link->irq.initialized) { | |
696 | up(&acpi_link_lock); | |
697 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n")); | |
698 | return_VALUE(-1); | |
699 | } | |
ecc21ebe DSL |
700 | #ifdef FUTURE_USE |
701 | /* | |
702 | * The Link reference count allows us to _DISable an unused link | |
703 | * and suspend time, and set it again on resume. | |
704 | * However, 2.6.12 still has irq_router.resume | |
705 | * which blindly restores the link state. | |
706 | * So we disable the reference count method | |
707 | * to prevent duplicate acpi_pci_link_set() | |
708 | * which would harm some systems | |
709 | */ | |
4be44fcd | 710 | link->refcnt--; |
ecc21ebe | 711 | #endif |
87bec66b | 712 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
713 | "Link %s is dereferenced\n", |
714 | acpi_device_bid(link->device))); | |
87bec66b DSL |
715 | |
716 | if (link->refcnt == 0) { | |
717 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
718 | } | |
719 | up(&acpi_link_lock); | |
720 | return_VALUE(link->irq.active); | |
721 | } | |
4be44fcd | 722 | |
1da177e4 LT |
723 | /* -------------------------------------------------------------------------- |
724 | Driver Interface | |
725 | -------------------------------------------------------------------------- */ | |
726 | ||
4be44fcd | 727 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 728 | { |
4be44fcd LB |
729 | int result = 0; |
730 | struct acpi_pci_link *link = NULL; | |
731 | int i = 0; | |
732 | int found = 0; | |
1da177e4 LT |
733 | |
734 | ACPI_FUNCTION_TRACE("acpi_pci_link_add"); | |
735 | ||
736 | if (!device) | |
737 | return_VALUE(-EINVAL); | |
738 | ||
739 | link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); | |
740 | if (!link) | |
741 | return_VALUE(-ENOMEM); | |
742 | memset(link, 0, sizeof(struct acpi_pci_link)); | |
743 | ||
744 | link->device = device; | |
745 | link->handle = device->handle; | |
746 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); | |
747 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
748 | acpi_driver_data(device) = link; | |
749 | ||
87bec66b | 750 | down(&acpi_link_lock); |
1da177e4 LT |
751 | result = acpi_pci_link_get_possible(link); |
752 | if (result) | |
753 | goto end; | |
754 | ||
755 | /* query and set link->irq.active */ | |
756 | acpi_pci_link_get_current(link); | |
757 | ||
758 | printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), | |
4be44fcd | 759 | acpi_device_bid(device)); |
1da177e4 LT |
760 | for (i = 0; i < link->irq.possible_count; i++) { |
761 | if (link->irq.active == link->irq.possible[i]) { | |
762 | printk(" *%d", link->irq.possible[i]); | |
763 | found = 1; | |
4be44fcd | 764 | } else |
1da177e4 LT |
765 | printk(" %d", link->irq.possible[i]); |
766 | } | |
767 | ||
768 | printk(")"); | |
769 | ||
770 | if (!found) | |
771 | printk(" *%d", link->irq.active); | |
772 | ||
4be44fcd | 773 | if (!link->device->status.enabled) |
1da177e4 LT |
774 | printk(", disabled."); |
775 | ||
776 | printk("\n"); | |
777 | ||
778 | /* TBD: Acquire/release lock */ | |
779 | list_add_tail(&link->node, &acpi_link.entries); | |
780 | acpi_link.count++; | |
781 | ||
4be44fcd | 782 | end: |
1da177e4 LT |
783 | /* disable all links -- to be activated on use */ |
784 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
87bec66b | 785 | up(&acpi_link_lock); |
1da177e4 LT |
786 | |
787 | if (result) | |
788 | kfree(link); | |
789 | ||
790 | return_VALUE(result); | |
791 | } | |
792 | ||
4be44fcd | 793 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 LT |
794 | { |
795 | ACPI_FUNCTION_TRACE("acpi_pci_link_resume"); | |
796 | ||
797 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
798 | return_VALUE(acpi_pci_link_set(link, link->irq.active)); | |
799 | else | |
800 | return_VALUE(0); | |
801 | } | |
802 | ||
11e981f1 DSL |
803 | /* |
804 | * FIXME: this is a workaround to avoid nasty warning. It will be removed | |
805 | * after every device calls pci_disable_device in .resume. | |
806 | */ | |
807 | int acpi_in_resume; | |
4be44fcd | 808 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 809 | { |
4be44fcd LB |
810 | struct list_head *node = NULL; |
811 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 812 | |
697a2d63 | 813 | ACPI_FUNCTION_TRACE("irqrouter_resume"); |
1da177e4 | 814 | |
11e981f1 | 815 | acpi_in_resume = 1; |
1da177e4 | 816 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
817 | link = list_entry(node, struct acpi_pci_link, node); |
818 | if (!link) { | |
87bec66b | 819 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
4be44fcd | 820 | "Invalid link context\n")); |
1da177e4 LT |
821 | continue; |
822 | } | |
697a2d63 | 823 | acpi_pci_link_resume(link); |
1da177e4 | 824 | } |
11e981f1 | 825 | acpi_in_resume = 0; |
697a2d63 | 826 | return_VALUE(0); |
1da177e4 LT |
827 | } |
828 | ||
4be44fcd | 829 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
830 | { |
831 | struct acpi_pci_link *link = NULL; | |
832 | ||
833 | ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); | |
834 | ||
835 | if (!device || !acpi_driver_data(device)) | |
836 | return_VALUE(-EINVAL); | |
837 | ||
4be44fcd | 838 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 839 | |
87bec66b | 840 | down(&acpi_link_lock); |
1da177e4 | 841 | list_del(&link->node); |
87bec66b | 842 | up(&acpi_link_lock); |
1da177e4 LT |
843 | |
844 | kfree(link); | |
845 | ||
846 | return_VALUE(0); | |
847 | } | |
848 | ||
849 | /* | |
850 | * modify acpi_irq_penalty[] from cmdline | |
851 | */ | |
852 | static int __init acpi_irq_penalty_update(char *str, int used) | |
853 | { | |
854 | int i; | |
855 | ||
856 | for (i = 0; i < 16; i++) { | |
857 | int retval; | |
858 | int irq; | |
859 | ||
4be44fcd | 860 | retval = get_option(&str, &irq); |
1da177e4 LT |
861 | |
862 | if (!retval) | |
863 | break; /* no number found */ | |
864 | ||
865 | if (irq < 0) | |
866 | continue; | |
4be44fcd | 867 | |
1da177e4 LT |
868 | if (irq >= ACPI_MAX_IRQS) |
869 | continue; | |
870 | ||
871 | if (used) | |
872 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
873 | else | |
874 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
875 | ||
876 | if (retval != 2) /* no next number */ | |
877 | break; | |
878 | } | |
879 | return 1; | |
880 | } | |
881 | ||
882 | /* | |
883 | * We'd like PNP to call this routine for the | |
884 | * single ISA_USED value for each legacy device. | |
885 | * But instead it calls us with each POSSIBLE setting. | |
886 | * There is no ISA_POSSIBLE weight, so we simply use | |
887 | * the (small) PCI_USING penalty. | |
888 | */ | |
c9c3e457 | 889 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 890 | { |
c9c3e457 DSL |
891 | if (active) |
892 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
893 | else | |
894 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
895 | } |
896 | ||
897 | /* | |
898 | * Over-ride default table to reserve additional IRQs for use by ISA | |
899 | * e.g. acpi_irq_isa=5 | |
900 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
901 | */ | |
902 | static int __init acpi_irq_isa(char *str) | |
903 | { | |
904 | return acpi_irq_penalty_update(str, 1); | |
905 | } | |
4be44fcd | 906 | |
1da177e4 LT |
907 | __setup("acpi_irq_isa=", acpi_irq_isa); |
908 | ||
909 | /* | |
910 | * Over-ride default table to free additional IRQs for use by PCI | |
911 | * e.g. acpi_irq_pci=7,15 | |
912 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
913 | */ | |
914 | static int __init acpi_irq_pci(char *str) | |
915 | { | |
916 | return acpi_irq_penalty_update(str, 0); | |
917 | } | |
4be44fcd | 918 | |
1da177e4 LT |
919 | __setup("acpi_irq_pci=", acpi_irq_pci); |
920 | ||
921 | static int __init acpi_irq_nobalance_set(char *str) | |
922 | { | |
923 | acpi_irq_balance = 0; | |
924 | return 1; | |
925 | } | |
4be44fcd | 926 | |
1da177e4 LT |
927 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
928 | ||
929 | int __init acpi_irq_balance_set(char *str) | |
930 | { | |
931 | acpi_irq_balance = 1; | |
932 | return 1; | |
933 | } | |
1da177e4 | 934 | |
4be44fcd | 935 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 936 | |
87bec66b | 937 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 938 | static struct sysdev_class irqrouter_sysdev_class = { |
4be44fcd LB |
939 | set_kset_name("irqrouter"), |
940 | .resume = irqrouter_resume, | |
1da177e4 LT |
941 | }; |
942 | ||
1da177e4 | 943 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
944 | .id = 0, |
945 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
946 | }; |
947 | ||
1da177e4 LT |
948 | static int __init irqrouter_init_sysfs(void) |
949 | { | |
950 | int error; | |
951 | ||
952 | ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); | |
953 | ||
954 | if (acpi_disabled || acpi_noirq) | |
955 | return_VALUE(0); | |
956 | ||
957 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
958 | if (!error) | |
959 | error = sysdev_register(&device_irqrouter); | |
960 | ||
961 | return_VALUE(error); | |
4be44fcd | 962 | } |
1da177e4 LT |
963 | |
964 | device_initcall(irqrouter_init_sysfs); | |
965 | ||
4be44fcd | 966 | static int __init acpi_pci_link_init(void) |
1da177e4 LT |
967 | { |
968 | ACPI_FUNCTION_TRACE("acpi_pci_link_init"); | |
969 | ||
970 | if (acpi_noirq) | |
971 | return_VALUE(0); | |
972 | ||
973 | acpi_link.count = 0; | |
974 | INIT_LIST_HEAD(&acpi_link.entries); | |
975 | ||
976 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
977 | return_VALUE(-ENODEV); | |
978 | ||
979 | return_VALUE(0); | |
980 | } | |
981 | ||
982 | subsys_initcall(acpi_pci_link_init); |