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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> | |
36e43095 | 41 | #include <linux/mutex.h> |
1da177e4 LT |
42 | |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
45 | ||
1c9ca3a7 | 46 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 47 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 48 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
49 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
50 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
51 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1c9ca3a7 BH |
52 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
53 | ||
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 | 56 | |
1ba90e3a TR |
57 | static struct acpi_device_id link_device_ids[] = { |
58 | {"PNP0C0F", 0}, | |
59 | {"", 0}, | |
60 | }; | |
61 | MODULE_DEVICE_TABLE(acpi, link_device_ids); | |
62 | ||
1da177e4 | 63 | static struct acpi_driver acpi_pci_link_driver = { |
c2b6705b | 64 | .name = "pci_link", |
4be44fcd | 65 | .class = ACPI_PCI_LINK_CLASS, |
1ba90e3a | 66 | .ids = link_device_ids, |
4be44fcd LB |
67 | .ops = { |
68 | .add = acpi_pci_link_add, | |
69 | .remove = acpi_pci_link_remove, | |
1c9ca3a7 | 70 | }, |
1da177e4 LT |
71 | }; |
72 | ||
87bec66b DSL |
73 | /* |
74 | * If a link is initialized, we never change its active and initialized | |
75 | * later even the link is disable. Instead, we just repick the active irq | |
76 | */ | |
1da177e4 | 77 | struct acpi_pci_link_irq { |
4be44fcd | 78 | u8 active; /* Current IRQ */ |
50eca3eb | 79 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 80 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
81 | u8 resource_type; |
82 | u8 possible_count; | |
83 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
84 | u8 initialized:1; | |
85 | u8 reserved:7; | |
1da177e4 LT |
86 | }; |
87 | ||
88 | struct acpi_pci_link { | |
1c9ca3a7 BH |
89 | struct list_head node; |
90 | struct acpi_device *device; | |
91 | struct acpi_pci_link_irq irq; | |
92 | int refcnt; | |
1da177e4 LT |
93 | }; |
94 | ||
95 | static struct { | |
1c9ca3a7 BH |
96 | int count; |
97 | struct list_head entries; | |
4be44fcd | 98 | } acpi_link; |
e5685b9d | 99 | static DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 100 | |
1da177e4 LT |
101 | /* -------------------------------------------------------------------------- |
102 | PCI Link Device Management | |
103 | -------------------------------------------------------------------------- */ | |
104 | ||
105 | /* | |
106 | * set context (link) possible list from resource list | |
107 | */ | |
1c9ca3a7 BH |
108 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
109 | void *context) | |
1da177e4 | 110 | { |
50dd0969 | 111 | struct acpi_pci_link *link = context; |
c9d62443 | 112 | u32 i; |
1da177e4 | 113 | |
eca008c8 | 114 | switch (resource->type) { |
50eca3eb | 115 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 116 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 117 | return AE_OK; |
50eca3eb | 118 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
119 | { |
120 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 121 | if (!p || !p->interrupt_count) { |
4a5e3638 BH |
122 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
123 | "Blank _PRS IRQ resource\n")); | |
d550d98d | 124 | return AE_OK; |
1da177e4 | 125 | } |
4be44fcd | 126 | for (i = 0; |
50eca3eb | 127 | (i < p->interrupt_count |
4be44fcd LB |
128 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
129 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
130 | printk(KERN_WARNING PREFIX |
131 | "Invalid _PRS IRQ %d\n", | |
132 | p->interrupts[i]); | |
4be44fcd LB |
133 | continue; |
134 | } | |
135 | link->irq.possible[i] = p->interrupts[i]; | |
136 | link->irq.possible_count++; | |
137 | } | |
50eca3eb BM |
138 | link->irq.triggering = p->triggering; |
139 | link->irq.polarity = p->polarity; | |
140 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 141 | break; |
1da177e4 | 142 | } |
50eca3eb | 143 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 144 | { |
50eca3eb | 145 | struct acpi_resource_extended_irq *p = |
4be44fcd | 146 | &resource->data.extended_irq; |
50eca3eb | 147 | if (!p || !p->interrupt_count) { |
cece9296 | 148 | printk(KERN_WARNING PREFIX |
4a5e3638 | 149 | "Blank _PRS EXT IRQ resource\n"); |
d550d98d | 150 | return AE_OK; |
4be44fcd LB |
151 | } |
152 | for (i = 0; | |
50eca3eb | 153 | (i < p->interrupt_count |
4be44fcd LB |
154 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
155 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
156 | printk(KERN_WARNING PREFIX |
157 | "Invalid _PRS IRQ %d\n", | |
158 | p->interrupts[i]); | |
4be44fcd LB |
159 | continue; |
160 | } | |
161 | link->irq.possible[i] = p->interrupts[i]; | |
162 | link->irq.possible_count++; | |
1da177e4 | 163 | } |
50eca3eb BM |
164 | link->irq.triggering = p->triggering; |
165 | link->irq.polarity = p->polarity; | |
166 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 167 | break; |
1da177e4 | 168 | } |
1da177e4 | 169 | default: |
4a5e3638 BH |
170 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
171 | resource->type); | |
d550d98d | 172 | return AE_OK; |
1da177e4 LT |
173 | } |
174 | ||
d550d98d | 175 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
176 | } |
177 | ||
4be44fcd | 178 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 179 | { |
4be44fcd | 180 | acpi_status status; |
1da177e4 | 181 | |
1da177e4 | 182 | if (!link) |
d550d98d | 183 | return -EINVAL; |
1da177e4 | 184 | |
67a71365 | 185 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 186 | acpi_pci_link_check_possible, link); |
1da177e4 | 187 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 188 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 189 | return -ENODEV; |
1da177e4 LT |
190 | } |
191 | ||
4be44fcd LB |
192 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
193 | "Found %d possible IRQs\n", | |
194 | link->irq.possible_count)); | |
1da177e4 | 195 | |
d550d98d | 196 | return 0; |
1da177e4 LT |
197 | } |
198 | ||
1c9ca3a7 BH |
199 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
200 | void *context) | |
1da177e4 | 201 | { |
c9d62443 | 202 | int *irq = context; |
1da177e4 | 203 | |
eca008c8 | 204 | switch (resource->type) { |
4a5e3638 BH |
205 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
206 | case ACPI_RESOURCE_TYPE_END_TAG: | |
207 | return AE_OK; | |
50eca3eb | 208 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
209 | { |
210 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 211 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
212 | /* |
213 | * IRQ descriptors may have no IRQ# bits set, | |
214 | * particularly those those w/ _STA disabled | |
215 | */ | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4a5e3638 | 217 | "Blank _CRS IRQ resource\n")); |
d550d98d | 218 | return AE_OK; |
4be44fcd LB |
219 | } |
220 | *irq = p->interrupts[0]; | |
221 | break; | |
1da177e4 | 222 | } |
50eca3eb | 223 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 224 | { |
50eca3eb | 225 | struct acpi_resource_extended_irq *p = |
4be44fcd | 226 | &resource->data.extended_irq; |
50eca3eb | 227 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
228 | /* |
229 | * extended IRQ descriptors must | |
230 | * return at least 1 IRQ | |
231 | */ | |
cece9296 | 232 | printk(KERN_WARNING PREFIX |
4a5e3638 | 233 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 234 | return AE_OK; |
4be44fcd LB |
235 | } |
236 | *irq = p->interrupts[0]; | |
237 | break; | |
1da177e4 | 238 | } |
d4ec6c7c | 239 | break; |
1da177e4 | 240 | default: |
4a5e3638 BH |
241 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
242 | resource->type); | |
d550d98d | 243 | return AE_OK; |
1da177e4 | 244 | } |
4a5e3638 | 245 | |
d550d98d | 246 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
247 | } |
248 | ||
249 | /* | |
250 | * Run _CRS and set link->irq.active | |
251 | * | |
252 | * return value: | |
253 | * 0 - success | |
254 | * !0 - failure | |
255 | */ | |
4be44fcd | 256 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 257 | { |
4be44fcd | 258 | int result = 0; |
c9d62443 | 259 | acpi_status status; |
4be44fcd | 260 | int irq = 0; |
1da177e4 | 261 | |
e0e4e117 | 262 | if (!link) |
d550d98d | 263 | return -EINVAL; |
1da177e4 LT |
264 | |
265 | link->irq.active = 0; | |
266 | ||
267 | /* in practice, status disabled is meaningless, ignore it */ | |
268 | if (acpi_strict) { | |
269 | /* Query _STA, set link->device->status */ | |
270 | result = acpi_bus_get_status(link->device); | |
271 | if (result) { | |
6468463a | 272 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
273 | goto end; |
274 | } | |
275 | ||
276 | if (!link->device->status.enabled) { | |
277 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 278 | return 0; |
1da177e4 LT |
279 | } |
280 | } | |
281 | ||
282 | /* | |
283 | * Query and parse _CRS to get the current IRQ assignment. | |
284 | */ | |
285 | ||
67a71365 | 286 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 287 | acpi_pci_link_check_current, &irq); |
1da177e4 | 288 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 289 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
290 | result = -ENODEV; |
291 | goto end; | |
292 | } | |
293 | ||
294 | if (acpi_strict && !irq) { | |
6468463a | 295 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
296 | result = -ENODEV; |
297 | } | |
298 | ||
299 | link->irq.active = irq; | |
300 | ||
301 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
302 | ||
4be44fcd | 303 | end: |
d550d98d | 304 | return result; |
1da177e4 LT |
305 | } |
306 | ||
4be44fcd | 307 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 308 | { |
c9d62443 BH |
309 | int result; |
310 | acpi_status status; | |
1da177e4 | 311 | struct { |
4be44fcd LB |
312 | struct acpi_resource res; |
313 | struct acpi_resource end; | |
314 | } *resource; | |
315 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 316 | |
1da177e4 | 317 | if (!link || !irq) |
d550d98d | 318 | return -EINVAL; |
1da177e4 | 319 | |
36bcbec7 | 320 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 321 | if (!resource) |
d550d98d | 322 | return -ENOMEM; |
1da177e4 | 323 | |
4be44fcd | 324 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
325 | buffer.pointer = resource; |
326 | ||
4be44fcd | 327 | switch (link->irq.resource_type) { |
50eca3eb BM |
328 | case ACPI_RESOURCE_TYPE_IRQ: |
329 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 330 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
331 | resource->res.data.irq.triggering = link->irq.triggering; |
332 | resource->res.data.irq.polarity = | |
333 | link->irq.polarity; | |
334 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
335 | resource->res.data.irq.sharable = | |
4be44fcd | 336 | ACPI_EXCLUSIVE; |
1da177e4 | 337 | else |
50eca3eb BM |
338 | resource->res.data.irq.sharable = ACPI_SHARED; |
339 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
340 | resource->res.data.irq.interrupts[0] = irq; |
341 | break; | |
4be44fcd | 342 | |
50eca3eb BM |
343 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
344 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 345 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
346 | resource->res.data.extended_irq.producer_consumer = |
347 | ACPI_CONSUMER; | |
50eca3eb BM |
348 | resource->res.data.extended_irq.triggering = |
349 | link->irq.triggering; | |
350 | resource->res.data.extended_irq.polarity = | |
351 | link->irq.polarity; | |
352 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
353 | resource->res.data.irq.sharable = | |
4be44fcd | 354 | ACPI_EXCLUSIVE; |
1da177e4 | 355 | else |
50eca3eb BM |
356 | resource->res.data.irq.sharable = ACPI_SHARED; |
357 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
358 | resource->res.data.extended_irq.interrupts[0] = irq; |
359 | /* ignore resource_source, it's optional */ | |
360 | break; | |
361 | default: | |
6468463a | 362 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
363 | result = -EINVAL; |
364 | goto end; | |
365 | ||
366 | } | |
50eca3eb | 367 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
368 | |
369 | /* Attempt to set the resource */ | |
67a71365 | 370 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
371 | |
372 | /* check for total failure */ | |
373 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 374 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
375 | result = -ENODEV; |
376 | goto end; | |
377 | } | |
378 | ||
379 | /* Query _STA, set device->status */ | |
380 | result = acpi_bus_get_status(link->device); | |
381 | if (result) { | |
6468463a | 382 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
383 | goto end; |
384 | } | |
385 | if (!link->device->status.enabled) { | |
cece9296 LB |
386 | printk(KERN_WARNING PREFIX |
387 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 388 | acpi_device_name(link->device), |
cece9296 | 389 | acpi_device_bid(link->device)); |
1da177e4 LT |
390 | } |
391 | ||
392 | /* Query _CRS, set link->irq.active */ | |
393 | result = acpi_pci_link_get_current(link); | |
394 | if (result) { | |
395 | goto end; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Is current setting not what we set? | |
400 | * set link->irq.active | |
401 | */ | |
402 | if (link->irq.active != irq) { | |
403 | /* | |
404 | * policy: when _CRS doesn't return what we just _SRS | |
405 | * assume _SRS worked and override _CRS value. | |
406 | */ | |
cece9296 LB |
407 | printk(KERN_WARNING PREFIX |
408 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 409 | acpi_device_name(link->device), |
cece9296 | 410 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
411 | link->irq.active = irq; |
412 | } | |
413 | ||
414 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
415 | |
416 | end: | |
1da177e4 | 417 | kfree(resource); |
d550d98d | 418 | return result; |
1da177e4 LT |
419 | } |
420 | ||
1da177e4 LT |
421 | /* -------------------------------------------------------------------------- |
422 | PCI Link IRQ Management | |
423 | -------------------------------------------------------------------------- */ | |
424 | ||
425 | /* | |
426 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
427 | * Link Devices to move the PIRQs around to minimize sharing. | |
428 | * | |
429 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
430 | * that the BIOS has already set to active. This is necessary because | |
431 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
432 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
433 | * even if acpi_irq_nobalance is set. | |
434 | * | |
435 | * A tables of penalties avoids directing PCI interrupts to well known | |
436 | * ISA IRQs. Boot params are available to over-ride the default table: | |
437 | * | |
438 | * List interrupts that are free for PCI use. | |
439 | * acpi_irq_pci=n[,m] | |
440 | * | |
441 | * List interrupts that should not be used for PCI: | |
442 | * acpi_irq_isa=n[,m] | |
443 | * | |
444 | * Note that PCI IRQ routers have a list of possible IRQs, | |
445 | * which may not include the IRQs this table says are available. | |
446 | * | |
447 | * Since this heuristic can't tell the difference between a link | |
448 | * that no device will attach to, vs. a link which may be shared | |
449 | * by multiple active devices -- it is not optimal. | |
450 | * | |
451 | * If interrupt performance is that important, get an IO-APIC system | |
452 | * with a pin dedicated to each device. Or for that matter, an MSI | |
453 | * enabled system. | |
454 | */ | |
455 | ||
456 | #define ACPI_MAX_IRQS 256 | |
457 | #define ACPI_MAX_ISA_IRQ 16 | |
458 | ||
459 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
460 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
461 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
462 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
463 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
464 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
465 | ||
466 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
467 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
468 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
469 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
470 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
471 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
472 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
473 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
474 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
475 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
476 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
477 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
478 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
479 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
480 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
481 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
482 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 483 | /* >IRQ15 */ |
1da177e4 LT |
484 | }; |
485 | ||
4be44fcd | 486 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 487 | { |
c9d62443 BH |
488 | struct list_head *node; |
489 | struct acpi_pci_link *link; | |
490 | int i; | |
1da177e4 | 491 | |
1da177e4 LT |
492 | /* |
493 | * Update penalties to facilitate IRQ balancing. | |
494 | */ | |
495 | list_for_each(node, &acpi_link.entries) { | |
1da177e4 LT |
496 | link = list_entry(node, struct acpi_pci_link, node); |
497 | if (!link) { | |
6468463a | 498 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
499 | continue; |
500 | } | |
501 | ||
502 | /* | |
503 | * reflect the possible and active irqs in the penalty table -- | |
504 | * useful for breaking ties. | |
505 | */ | |
506 | if (link->irq.possible_count) { | |
4be44fcd LB |
507 | int penalty = |
508 | PIRQ_PENALTY_PCI_POSSIBLE / | |
509 | link->irq.possible_count; | |
1da177e4 LT |
510 | |
511 | for (i = 0; i < link->irq.possible_count; i++) { | |
512 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
513 | acpi_irq_penalty[link->irq. |
514 | possible[i]] += | |
515 | penalty; | |
1da177e4 LT |
516 | } |
517 | ||
518 | } else if (link->irq.active) { | |
4be44fcd LB |
519 | acpi_irq_penalty[link->irq.active] += |
520 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
521 | } |
522 | } | |
523 | /* Add a penalty for the SCI */ | |
cee324b1 | 524 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
d550d98d | 525 | return 0; |
1da177e4 LT |
526 | } |
527 | ||
32836259 | 528 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 529 | |
4be44fcd | 530 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 531 | { |
4be44fcd LB |
532 | int irq; |
533 | int i; | |
1da177e4 | 534 | |
87bec66b DSL |
535 | if (link->irq.initialized) { |
536 | if (link->refcnt == 0) | |
537 | /* This means the link is disabled but initialized */ | |
538 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 539 | return 0; |
87bec66b | 540 | } |
1da177e4 LT |
541 | |
542 | /* | |
543 | * search for active IRQ in list of possible IRQs. | |
544 | */ | |
545 | for (i = 0; i < link->irq.possible_count; ++i) { | |
546 | if (link->irq.active == link->irq.possible[i]) | |
547 | break; | |
548 | } | |
549 | /* | |
550 | * forget active IRQ that is not in possible list | |
551 | */ | |
552 | if (i == link->irq.possible_count) { | |
553 | if (acpi_strict) | |
cece9296 LB |
554 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
555 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
556 | link->irq.active = 0; |
557 | } | |
558 | ||
559 | /* | |
560 | * if active found, use it; else pick entry from end of possible list. | |
561 | */ | |
1c9ca3a7 | 562 | if (link->irq.active) |
1da177e4 | 563 | irq = link->irq.active; |
1c9ca3a7 | 564 | else |
1da177e4 | 565 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
566 | |
567 | if (acpi_irq_balance || !link->irq.active) { | |
568 | /* | |
569 | * Select the best IRQ. This is done in reverse to promote | |
570 | * the use of IRQs 9, 10, 11, and >15. | |
571 | */ | |
572 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
573 | if (acpi_irq_penalty[irq] > |
574 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
575 | irq = link->irq.possible[i]; |
576 | } | |
577 | } | |
578 | ||
579 | /* Attempt to enable the link device at this IRQ. */ | |
580 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
581 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
582 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 583 | acpi_device_name(link->device), |
6468463a | 584 | acpi_device_bid(link->device)); |
d550d98d | 585 | return -ENODEV; |
1da177e4 LT |
586 | } else { |
587 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4d939155 | 588 | printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
589 | acpi_device_name(link->device), |
590 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
591 | } |
592 | ||
593 | link->irq.initialized = 1; | |
d550d98d | 594 | return 0; |
1da177e4 LT |
595 | } |
596 | ||
597 | /* | |
87bec66b | 598 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
599 | * success: return IRQ >= 0 |
600 | * failure: return -1 | |
601 | */ | |
1c9ca3a7 BH |
602 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
603 | int *polarity, char **name) | |
1da177e4 | 604 | { |
c9d62443 BH |
605 | int result; |
606 | struct acpi_device *device; | |
607 | struct acpi_pci_link *link; | |
1da177e4 | 608 | |
1da177e4 LT |
609 | result = acpi_bus_get_device(handle, &device); |
610 | if (result) { | |
6468463a | 611 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 612 | return -1; |
1da177e4 LT |
613 | } |
614 | ||
50dd0969 | 615 | link = acpi_driver_data(device); |
1da177e4 | 616 | if (!link) { |
6468463a | 617 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 618 | return -1; |
1da177e4 LT |
619 | } |
620 | ||
621 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
622 | if (index) { | |
6468463a | 623 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 624 | return -1; |
1da177e4 LT |
625 | } |
626 | ||
36e43095 | 627 | mutex_lock(&acpi_link_lock); |
87bec66b | 628 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 629 | mutex_unlock(&acpi_link_lock); |
d550d98d | 630 | return -1; |
87bec66b | 631 | } |
4be44fcd | 632 | |
1da177e4 | 633 | if (!link->irq.active) { |
36e43095 | 634 | mutex_unlock(&acpi_link_lock); |
6468463a | 635 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 636 | return -1; |
1da177e4 | 637 | } |
4be44fcd | 638 | link->refcnt++; |
36e43095 | 639 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 640 | |
50eca3eb BM |
641 | if (triggering) |
642 | *triggering = link->irq.triggering; | |
643 | if (polarity) | |
644 | *polarity = link->irq.polarity; | |
4be44fcd LB |
645 | if (name) |
646 | *name = acpi_device_bid(link->device); | |
87bec66b | 647 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
648 | "Link %s is referenced\n", |
649 | acpi_device_bid(link->device))); | |
d550d98d | 650 | return (link->irq.active); |
1da177e4 LT |
651 | } |
652 | ||
87bec66b DSL |
653 | /* |
654 | * We don't change link's irq information here. After it is reenabled, we | |
655 | * continue use the info | |
656 | */ | |
4be44fcd | 657 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 658 | { |
c9d62443 BH |
659 | struct acpi_device *device; |
660 | struct acpi_pci_link *link; | |
4be44fcd | 661 | acpi_status result; |
87bec66b | 662 | |
87bec66b DSL |
663 | result = acpi_bus_get_device(handle, &device); |
664 | if (result) { | |
6468463a | 665 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 666 | return -1; |
87bec66b | 667 | } |
1da177e4 | 668 | |
50dd0969 | 669 | link = acpi_driver_data(device); |
87bec66b | 670 | if (!link) { |
6468463a | 671 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 672 | return -1; |
87bec66b DSL |
673 | } |
674 | ||
36e43095 | 675 | mutex_lock(&acpi_link_lock); |
87bec66b | 676 | if (!link->irq.initialized) { |
36e43095 | 677 | mutex_unlock(&acpi_link_lock); |
6468463a | 678 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 679 | return -1; |
87bec66b | 680 | } |
ecc21ebe DSL |
681 | #ifdef FUTURE_USE |
682 | /* | |
683 | * The Link reference count allows us to _DISable an unused link | |
684 | * and suspend time, and set it again on resume. | |
685 | * However, 2.6.12 still has irq_router.resume | |
686 | * which blindly restores the link state. | |
687 | * So we disable the reference count method | |
688 | * to prevent duplicate acpi_pci_link_set() | |
689 | * which would harm some systems | |
690 | */ | |
4be44fcd | 691 | link->refcnt--; |
ecc21ebe | 692 | #endif |
87bec66b | 693 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
694 | "Link %s is dereferenced\n", |
695 | acpi_device_bid(link->device))); | |
87bec66b | 696 | |
1c9ca3a7 | 697 | if (link->refcnt == 0) |
383d7a11 | 698 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 699 | |
36e43095 | 700 | mutex_unlock(&acpi_link_lock); |
d550d98d | 701 | return (link->irq.active); |
87bec66b | 702 | } |
4be44fcd | 703 | |
1da177e4 LT |
704 | /* -------------------------------------------------------------------------- |
705 | Driver Interface | |
706 | -------------------------------------------------------------------------- */ | |
707 | ||
4be44fcd | 708 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 709 | { |
c9d62443 BH |
710 | int result; |
711 | struct acpi_pci_link *link; | |
712 | int i; | |
4be44fcd | 713 | int found = 0; |
1da177e4 | 714 | |
1da177e4 | 715 | if (!device) |
d550d98d | 716 | return -EINVAL; |
1da177e4 | 717 | |
36bcbec7 | 718 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 719 | if (!link) |
d550d98d | 720 | return -ENOMEM; |
1da177e4 LT |
721 | |
722 | link->device = device; | |
1da177e4 LT |
723 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
724 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 725 | device->driver_data = link; |
1da177e4 | 726 | |
36e43095 | 727 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
728 | result = acpi_pci_link_get_possible(link); |
729 | if (result) | |
730 | goto end; | |
731 | ||
732 | /* query and set link->irq.active */ | |
733 | acpi_pci_link_get_current(link); | |
734 | ||
0dc070bb | 735 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 736 | acpi_device_bid(device)); |
1da177e4 LT |
737 | for (i = 0; i < link->irq.possible_count; i++) { |
738 | if (link->irq.active == link->irq.possible[i]) { | |
739 | printk(" *%d", link->irq.possible[i]); | |
740 | found = 1; | |
4be44fcd | 741 | } else |
1da177e4 LT |
742 | printk(" %d", link->irq.possible[i]); |
743 | } | |
744 | ||
745 | printk(")"); | |
746 | ||
747 | if (!found) | |
748 | printk(" *%d", link->irq.active); | |
749 | ||
4be44fcd | 750 | if (!link->device->status.enabled) |
1da177e4 LT |
751 | printk(", disabled."); |
752 | ||
753 | printk("\n"); | |
754 | ||
755 | /* TBD: Acquire/release lock */ | |
756 | list_add_tail(&link->node, &acpi_link.entries); | |
757 | acpi_link.count++; | |
758 | ||
4be44fcd | 759 | end: |
1da177e4 | 760 | /* disable all links -- to be activated on use */ |
383d7a11 | 761 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 762 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
763 | |
764 | if (result) | |
765 | kfree(link); | |
766 | ||
d550d98d | 767 | return result; |
1da177e4 LT |
768 | } |
769 | ||
4be44fcd | 770 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 771 | { |
697a2d63 | 772 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 773 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
774 | |
775 | return 0; | |
697a2d63 LT |
776 | } |
777 | ||
4be44fcd | 778 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 779 | { |
c9d62443 BH |
780 | struct list_head *node; |
781 | struct acpi_pci_link *link; | |
1da177e4 | 782 | |
1da177e4 | 783 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
784 | link = list_entry(node, struct acpi_pci_link, node); |
785 | if (!link) { | |
6468463a | 786 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
787 | continue; |
788 | } | |
697a2d63 | 789 | acpi_pci_link_resume(link); |
1da177e4 | 790 | } |
d550d98d | 791 | return 0; |
1da177e4 LT |
792 | } |
793 | ||
4be44fcd | 794 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 | 795 | { |
c9d62443 | 796 | struct acpi_pci_link *link; |
1da177e4 | 797 | |
1da177e4 | 798 | if (!device || !acpi_driver_data(device)) |
d550d98d | 799 | return -EINVAL; |
1da177e4 | 800 | |
50dd0969 | 801 | link = acpi_driver_data(device); |
1da177e4 | 802 | |
36e43095 | 803 | mutex_lock(&acpi_link_lock); |
1da177e4 | 804 | list_del(&link->node); |
36e43095 | 805 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
806 | |
807 | kfree(link); | |
d550d98d | 808 | return 0; |
1da177e4 LT |
809 | } |
810 | ||
811 | /* | |
812 | * modify acpi_irq_penalty[] from cmdline | |
813 | */ | |
814 | static int __init acpi_irq_penalty_update(char *str, int used) | |
815 | { | |
816 | int i; | |
817 | ||
818 | for (i = 0; i < 16; i++) { | |
819 | int retval; | |
820 | int irq; | |
821 | ||
4be44fcd | 822 | retval = get_option(&str, &irq); |
1da177e4 LT |
823 | |
824 | if (!retval) | |
825 | break; /* no number found */ | |
826 | ||
827 | if (irq < 0) | |
828 | continue; | |
4be44fcd | 829 | |
fa46d352 | 830 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) |
1da177e4 LT |
831 | continue; |
832 | ||
833 | if (used) | |
834 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
835 | else | |
836 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
837 | ||
838 | if (retval != 2) /* no next number */ | |
839 | break; | |
840 | } | |
841 | return 1; | |
842 | } | |
843 | ||
844 | /* | |
845 | * We'd like PNP to call this routine for the | |
846 | * single ISA_USED value for each legacy device. | |
847 | * But instead it calls us with each POSSIBLE setting. | |
848 | * There is no ISA_POSSIBLE weight, so we simply use | |
849 | * the (small) PCI_USING penalty. | |
850 | */ | |
c9c3e457 | 851 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 852 | { |
fa46d352 BH |
853 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { |
854 | if (active) | |
855 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
856 | else | |
857 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
858 | } | |
1da177e4 LT |
859 | } |
860 | ||
861 | /* | |
862 | * Over-ride default table to reserve additional IRQs for use by ISA | |
863 | * e.g. acpi_irq_isa=5 | |
864 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
865 | */ | |
866 | static int __init acpi_irq_isa(char *str) | |
867 | { | |
868 | return acpi_irq_penalty_update(str, 1); | |
869 | } | |
4be44fcd | 870 | |
1da177e4 LT |
871 | __setup("acpi_irq_isa=", acpi_irq_isa); |
872 | ||
873 | /* | |
874 | * Over-ride default table to free additional IRQs for use by PCI | |
875 | * e.g. acpi_irq_pci=7,15 | |
876 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
877 | */ | |
878 | static int __init acpi_irq_pci(char *str) | |
879 | { | |
880 | return acpi_irq_penalty_update(str, 0); | |
881 | } | |
4be44fcd | 882 | |
1da177e4 LT |
883 | __setup("acpi_irq_pci=", acpi_irq_pci); |
884 | ||
885 | static int __init acpi_irq_nobalance_set(char *str) | |
886 | { | |
887 | acpi_irq_balance = 0; | |
888 | return 1; | |
889 | } | |
4be44fcd | 890 | |
1da177e4 LT |
891 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
892 | ||
8a383ef0 | 893 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
894 | { |
895 | acpi_irq_balance = 1; | |
896 | return 1; | |
897 | } | |
1da177e4 | 898 | |
4be44fcd | 899 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 900 | |
87bec66b | 901 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 902 | static struct sysdev_class irqrouter_sysdev_class = { |
af5ca3f4 | 903 | .name = "irqrouter", |
4be44fcd | 904 | .resume = irqrouter_resume, |
1da177e4 LT |
905 | }; |
906 | ||
1da177e4 | 907 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
908 | .id = 0, |
909 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
910 | }; |
911 | ||
1da177e4 LT |
912 | static int __init irqrouter_init_sysfs(void) |
913 | { | |
914 | int error; | |
915 | ||
1da177e4 | 916 | if (acpi_disabled || acpi_noirq) |
d550d98d | 917 | return 0; |
1da177e4 LT |
918 | |
919 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
920 | if (!error) | |
921 | error = sysdev_register(&device_irqrouter); | |
922 | ||
d550d98d | 923 | return error; |
4be44fcd | 924 | } |
1da177e4 LT |
925 | |
926 | device_initcall(irqrouter_init_sysfs); | |
927 | ||
4be44fcd | 928 | static int __init acpi_pci_link_init(void) |
1da177e4 | 929 | { |
1da177e4 | 930 | if (acpi_noirq) |
d550d98d | 931 | return 0; |
1da177e4 | 932 | |
32836259 BH |
933 | if (acpi_irq_balance == -1) { |
934 | /* no command line switch: enable balancing in IOAPIC mode */ | |
935 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
936 | acpi_irq_balance = 1; | |
937 | else | |
938 | acpi_irq_balance = 0; | |
939 | } | |
940 | ||
1da177e4 LT |
941 | acpi_link.count = 0; |
942 | INIT_LIST_HEAD(&acpi_link.entries); | |
943 | ||
944 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
d550d98d | 945 | return -ENODEV; |
1da177e4 | 946 | |
d550d98d | 947 | return 0; |
1da177e4 LT |
948 | } |
949 | ||
950 | subsys_initcall(acpi_pci_link_init); |