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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> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
1da177e4 LT |
43 | |
44 | #include <acpi/acpi_bus.h> | |
45 | #include <acpi/acpi_drivers.h> | |
46 | ||
a192a958 LB |
47 | #define PREFIX "ACPI: " |
48 | ||
1c9ca3a7 | 49 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 50 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 51 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
52 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
53 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
54 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1c9ca3a7 BH |
55 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
56 | ||
4be44fcd LB |
57 | static int acpi_pci_link_add(struct acpi_device *device); |
58 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
1da177e4 | 59 | |
c97adf9e | 60 | static const struct acpi_device_id link_device_ids[] = { |
1ba90e3a TR |
61 | {"PNP0C0F", 0}, |
62 | {"", 0}, | |
63 | }; | |
64 | MODULE_DEVICE_TABLE(acpi, link_device_ids); | |
65 | ||
1da177e4 | 66 | static struct acpi_driver acpi_pci_link_driver = { |
c2b6705b | 67 | .name = "pci_link", |
4be44fcd | 68 | .class = ACPI_PCI_LINK_CLASS, |
1ba90e3a | 69 | .ids = link_device_ids, |
4be44fcd LB |
70 | .ops = { |
71 | .add = acpi_pci_link_add, | |
72 | .remove = acpi_pci_link_remove, | |
1c9ca3a7 | 73 | }, |
1da177e4 LT |
74 | }; |
75 | ||
87bec66b DSL |
76 | /* |
77 | * If a link is initialized, we never change its active and initialized | |
78 | * later even the link is disable. Instead, we just repick the active irq | |
79 | */ | |
1da177e4 | 80 | struct acpi_pci_link_irq { |
4be44fcd | 81 | u8 active; /* Current IRQ */ |
50eca3eb | 82 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 83 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
84 | u8 resource_type; |
85 | u8 possible_count; | |
86 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
87 | u8 initialized:1; | |
88 | u8 reserved:7; | |
1da177e4 LT |
89 | }; |
90 | ||
91 | struct acpi_pci_link { | |
5f0dccaa | 92 | struct list_head list; |
1c9ca3a7 BH |
93 | struct acpi_device *device; |
94 | struct acpi_pci_link_irq irq; | |
95 | int refcnt; | |
1da177e4 LT |
96 | }; |
97 | ||
5f0dccaa | 98 | static LIST_HEAD(acpi_link_list); |
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 | |
67a71365 | 182 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 183 | acpi_pci_link_check_possible, link); |
1da177e4 | 184 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 185 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 186 | return -ENODEV; |
1da177e4 LT |
187 | } |
188 | ||
4be44fcd LB |
189 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
190 | "Found %d possible IRQs\n", | |
191 | link->irq.possible_count)); | |
1da177e4 | 192 | |
d550d98d | 193 | return 0; |
1da177e4 LT |
194 | } |
195 | ||
1c9ca3a7 BH |
196 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
197 | void *context) | |
1da177e4 | 198 | { |
c9d62443 | 199 | int *irq = context; |
1da177e4 | 200 | |
eca008c8 | 201 | switch (resource->type) { |
4a5e3638 BH |
202 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
203 | case ACPI_RESOURCE_TYPE_END_TAG: | |
204 | return AE_OK; | |
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, | |
4a5e3638 | 214 | "Blank _CRS IRQ resource\n")); |
d550d98d | 215 | return AE_OK; |
4be44fcd LB |
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 | */ | |
cece9296 | 229 | printk(KERN_WARNING PREFIX |
4a5e3638 | 230 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 231 | return AE_OK; |
4be44fcd LB |
232 | } |
233 | *irq = p->interrupts[0]; | |
234 | break; | |
1da177e4 | 235 | } |
d4ec6c7c | 236 | break; |
1da177e4 | 237 | default: |
4a5e3638 BH |
238 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
239 | resource->type); | |
d550d98d | 240 | return AE_OK; |
1da177e4 | 241 | } |
4a5e3638 | 242 | |
d550d98d | 243 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
244 | } |
245 | ||
246 | /* | |
247 | * Run _CRS and set link->irq.active | |
248 | * | |
249 | * return value: | |
250 | * 0 - success | |
251 | * !0 - failure | |
252 | */ | |
4be44fcd | 253 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 254 | { |
4be44fcd | 255 | int result = 0; |
c9d62443 | 256 | acpi_status status; |
4be44fcd | 257 | int irq = 0; |
1da177e4 | 258 | |
1da177e4 LT |
259 | link->irq.active = 0; |
260 | ||
261 | /* in practice, status disabled is meaningless, ignore it */ | |
262 | if (acpi_strict) { | |
263 | /* Query _STA, set link->device->status */ | |
264 | result = acpi_bus_get_status(link->device); | |
265 | if (result) { | |
6468463a | 266 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
267 | goto end; |
268 | } | |
269 | ||
270 | if (!link->device->status.enabled) { | |
271 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 272 | return 0; |
1da177e4 LT |
273 | } |
274 | } | |
275 | ||
276 | /* | |
277 | * Query and parse _CRS to get the current IRQ assignment. | |
278 | */ | |
279 | ||
67a71365 | 280 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 281 | acpi_pci_link_check_current, &irq); |
1da177e4 | 282 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 283 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
284 | result = -ENODEV; |
285 | goto end; | |
286 | } | |
287 | ||
288 | if (acpi_strict && !irq) { | |
6468463a | 289 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
290 | result = -ENODEV; |
291 | } | |
292 | ||
293 | link->irq.active = irq; | |
294 | ||
295 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
296 | ||
4be44fcd | 297 | end: |
d550d98d | 298 | return result; |
1da177e4 LT |
299 | } |
300 | ||
4be44fcd | 301 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 302 | { |
c9d62443 BH |
303 | int result; |
304 | acpi_status status; | |
1da177e4 | 305 | struct { |
4be44fcd LB |
306 | struct acpi_resource res; |
307 | struct acpi_resource end; | |
308 | } *resource; | |
309 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 310 | |
6eca4b4c | 311 | if (!irq) |
d550d98d | 312 | return -EINVAL; |
1da177e4 | 313 | |
36bcbec7 | 314 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 315 | if (!resource) |
d550d98d | 316 | return -ENOMEM; |
1da177e4 | 317 | |
4be44fcd | 318 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
319 | buffer.pointer = resource; |
320 | ||
4be44fcd | 321 | switch (link->irq.resource_type) { |
50eca3eb BM |
322 | case ACPI_RESOURCE_TYPE_IRQ: |
323 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 324 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
325 | resource->res.data.irq.triggering = link->irq.triggering; |
326 | resource->res.data.irq.polarity = | |
327 | link->irq.polarity; | |
328 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
329 | resource->res.data.irq.sharable = | |
4be44fcd | 330 | ACPI_EXCLUSIVE; |
1da177e4 | 331 | else |
50eca3eb BM |
332 | resource->res.data.irq.sharable = ACPI_SHARED; |
333 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
334 | resource->res.data.irq.interrupts[0] = irq; |
335 | break; | |
4be44fcd | 336 | |
50eca3eb BM |
337 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
338 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 339 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
340 | resource->res.data.extended_irq.producer_consumer = |
341 | ACPI_CONSUMER; | |
50eca3eb BM |
342 | resource->res.data.extended_irq.triggering = |
343 | link->irq.triggering; | |
344 | resource->res.data.extended_irq.polarity = | |
345 | link->irq.polarity; | |
346 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
347 | resource->res.data.irq.sharable = | |
4be44fcd | 348 | ACPI_EXCLUSIVE; |
1da177e4 | 349 | else |
50eca3eb BM |
350 | resource->res.data.irq.sharable = ACPI_SHARED; |
351 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
352 | resource->res.data.extended_irq.interrupts[0] = irq; |
353 | /* ignore resource_source, it's optional */ | |
354 | break; | |
355 | default: | |
6468463a | 356 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
357 | result = -EINVAL; |
358 | goto end; | |
359 | ||
360 | } | |
50eca3eb | 361 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
362 | |
363 | /* Attempt to set the resource */ | |
67a71365 | 364 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
365 | |
366 | /* check for total failure */ | |
367 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 368 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
369 | result = -ENODEV; |
370 | goto end; | |
371 | } | |
372 | ||
373 | /* Query _STA, set device->status */ | |
374 | result = acpi_bus_get_status(link->device); | |
375 | if (result) { | |
6468463a | 376 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
377 | goto end; |
378 | } | |
379 | if (!link->device->status.enabled) { | |
cece9296 LB |
380 | printk(KERN_WARNING PREFIX |
381 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 382 | acpi_device_name(link->device), |
cece9296 | 383 | acpi_device_bid(link->device)); |
1da177e4 LT |
384 | } |
385 | ||
386 | /* Query _CRS, set link->irq.active */ | |
387 | result = acpi_pci_link_get_current(link); | |
388 | if (result) { | |
389 | goto end; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Is current setting not what we set? | |
394 | * set link->irq.active | |
395 | */ | |
396 | if (link->irq.active != irq) { | |
397 | /* | |
398 | * policy: when _CRS doesn't return what we just _SRS | |
399 | * assume _SRS worked and override _CRS value. | |
400 | */ | |
cece9296 LB |
401 | printk(KERN_WARNING PREFIX |
402 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 403 | acpi_device_name(link->device), |
cece9296 | 404 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
405 | link->irq.active = irq; |
406 | } | |
407 | ||
408 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
409 | |
410 | end: | |
1da177e4 | 411 | kfree(resource); |
d550d98d | 412 | return result; |
1da177e4 LT |
413 | } |
414 | ||
1da177e4 LT |
415 | /* -------------------------------------------------------------------------- |
416 | PCI Link IRQ Management | |
417 | -------------------------------------------------------------------------- */ | |
418 | ||
419 | /* | |
420 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
421 | * Link Devices to move the PIRQs around to minimize sharing. | |
422 | * | |
423 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
424 | * that the BIOS has already set to active. This is necessary because | |
425 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
426 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
427 | * even if acpi_irq_nobalance is set. | |
428 | * | |
429 | * A tables of penalties avoids directing PCI interrupts to well known | |
430 | * ISA IRQs. Boot params are available to over-ride the default table: | |
431 | * | |
432 | * List interrupts that are free for PCI use. | |
433 | * acpi_irq_pci=n[,m] | |
434 | * | |
435 | * List interrupts that should not be used for PCI: | |
436 | * acpi_irq_isa=n[,m] | |
437 | * | |
438 | * Note that PCI IRQ routers have a list of possible IRQs, | |
439 | * which may not include the IRQs this table says are available. | |
440 | * | |
441 | * Since this heuristic can't tell the difference between a link | |
442 | * that no device will attach to, vs. a link which may be shared | |
443 | * by multiple active devices -- it is not optimal. | |
444 | * | |
445 | * If interrupt performance is that important, get an IO-APIC system | |
446 | * with a pin dedicated to each device. Or for that matter, an MSI | |
447 | * enabled system. | |
448 | */ | |
449 | ||
450 | #define ACPI_MAX_IRQS 256 | |
451 | #define ACPI_MAX_ISA_IRQ 16 | |
452 | ||
453 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
454 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
455 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
456 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
457 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
458 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
459 | ||
460 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
461 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
462 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
463 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
464 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
465 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
466 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
467 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
468 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
469 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
470 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
471 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
472 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
473 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
474 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
475 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
476 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 477 | /* >IRQ15 */ |
1da177e4 LT |
478 | }; |
479 | ||
4be44fcd | 480 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 481 | { |
c9d62443 BH |
482 | struct acpi_pci_link *link; |
483 | int i; | |
1da177e4 | 484 | |
1da177e4 LT |
485 | /* |
486 | * Update penalties to facilitate IRQ balancing. | |
487 | */ | |
5f0dccaa | 488 | list_for_each_entry(link, &acpi_link_list, list) { |
1da177e4 LT |
489 | |
490 | /* | |
491 | * reflect the possible and active irqs in the penalty table -- | |
492 | * useful for breaking ties. | |
493 | */ | |
494 | if (link->irq.possible_count) { | |
4be44fcd LB |
495 | int penalty = |
496 | PIRQ_PENALTY_PCI_POSSIBLE / | |
497 | link->irq.possible_count; | |
1da177e4 LT |
498 | |
499 | for (i = 0; i < link->irq.possible_count; i++) { | |
500 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
501 | acpi_irq_penalty[link->irq. |
502 | possible[i]] += | |
503 | penalty; | |
1da177e4 LT |
504 | } |
505 | ||
506 | } else if (link->irq.active) { | |
4be44fcd LB |
507 | acpi_irq_penalty[link->irq.active] += |
508 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
509 | } |
510 | } | |
511 | /* Add a penalty for the SCI */ | |
cee324b1 | 512 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
d550d98d | 513 | return 0; |
1da177e4 LT |
514 | } |
515 | ||
32836259 | 516 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 517 | |
4be44fcd | 518 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 519 | { |
4be44fcd LB |
520 | int irq; |
521 | int i; | |
1da177e4 | 522 | |
87bec66b DSL |
523 | if (link->irq.initialized) { |
524 | if (link->refcnt == 0) | |
525 | /* This means the link is disabled but initialized */ | |
526 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 527 | return 0; |
87bec66b | 528 | } |
1da177e4 LT |
529 | |
530 | /* | |
531 | * search for active IRQ in list of possible IRQs. | |
532 | */ | |
533 | for (i = 0; i < link->irq.possible_count; ++i) { | |
534 | if (link->irq.active == link->irq.possible[i]) | |
535 | break; | |
536 | } | |
537 | /* | |
538 | * forget active IRQ that is not in possible list | |
539 | */ | |
540 | if (i == link->irq.possible_count) { | |
541 | if (acpi_strict) | |
cece9296 LB |
542 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
543 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
544 | link->irq.active = 0; |
545 | } | |
546 | ||
547 | /* | |
548 | * if active found, use it; else pick entry from end of possible list. | |
549 | */ | |
1c9ca3a7 | 550 | if (link->irq.active) |
1da177e4 | 551 | irq = link->irq.active; |
1c9ca3a7 | 552 | else |
1da177e4 | 553 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
554 | |
555 | if (acpi_irq_balance || !link->irq.active) { | |
556 | /* | |
557 | * Select the best IRQ. This is done in reverse to promote | |
558 | * the use of IRQs 9, 10, 11, and >15. | |
559 | */ | |
560 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
561 | if (acpi_irq_penalty[irq] > |
562 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
563 | irq = link->irq.possible[i]; |
564 | } | |
565 | } | |
566 | ||
567 | /* Attempt to enable the link device at this IRQ. */ | |
568 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
569 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
570 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 571 | acpi_device_name(link->device), |
6468463a | 572 | acpi_device_bid(link->device)); |
d550d98d | 573 | return -ENODEV; |
1da177e4 LT |
574 | } else { |
575 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4d939155 | 576 | printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
577 | acpi_device_name(link->device), |
578 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
579 | } |
580 | ||
581 | link->irq.initialized = 1; | |
d550d98d | 582 | return 0; |
1da177e4 LT |
583 | } |
584 | ||
585 | /* | |
87bec66b | 586 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
587 | * success: return IRQ >= 0 |
588 | * failure: return -1 | |
589 | */ | |
1c9ca3a7 BH |
590 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
591 | int *polarity, char **name) | |
1da177e4 | 592 | { |
c9d62443 BH |
593 | int result; |
594 | struct acpi_device *device; | |
595 | struct acpi_pci_link *link; | |
1da177e4 | 596 | |
1da177e4 LT |
597 | result = acpi_bus_get_device(handle, &device); |
598 | if (result) { | |
6468463a | 599 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 600 | return -1; |
1da177e4 LT |
601 | } |
602 | ||
50dd0969 | 603 | link = acpi_driver_data(device); |
1da177e4 | 604 | if (!link) { |
6468463a | 605 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 606 | return -1; |
1da177e4 LT |
607 | } |
608 | ||
609 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
610 | if (index) { | |
6468463a | 611 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 612 | return -1; |
1da177e4 LT |
613 | } |
614 | ||
36e43095 | 615 | mutex_lock(&acpi_link_lock); |
87bec66b | 616 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 617 | mutex_unlock(&acpi_link_lock); |
d550d98d | 618 | return -1; |
87bec66b | 619 | } |
4be44fcd | 620 | |
1da177e4 | 621 | if (!link->irq.active) { |
36e43095 | 622 | mutex_unlock(&acpi_link_lock); |
6468463a | 623 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 624 | return -1; |
1da177e4 | 625 | } |
4be44fcd | 626 | link->refcnt++; |
36e43095 | 627 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 628 | |
50eca3eb BM |
629 | if (triggering) |
630 | *triggering = link->irq.triggering; | |
631 | if (polarity) | |
632 | *polarity = link->irq.polarity; | |
4be44fcd LB |
633 | if (name) |
634 | *name = acpi_device_bid(link->device); | |
87bec66b | 635 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
636 | "Link %s is referenced\n", |
637 | acpi_device_bid(link->device))); | |
d550d98d | 638 | return (link->irq.active); |
1da177e4 LT |
639 | } |
640 | ||
87bec66b DSL |
641 | /* |
642 | * We don't change link's irq information here. After it is reenabled, we | |
643 | * continue use the info | |
644 | */ | |
4be44fcd | 645 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 646 | { |
c9d62443 BH |
647 | struct acpi_device *device; |
648 | struct acpi_pci_link *link; | |
4be44fcd | 649 | acpi_status result; |
87bec66b | 650 | |
87bec66b DSL |
651 | result = acpi_bus_get_device(handle, &device); |
652 | if (result) { | |
6468463a | 653 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 654 | return -1; |
87bec66b | 655 | } |
1da177e4 | 656 | |
50dd0969 | 657 | link = acpi_driver_data(device); |
87bec66b | 658 | if (!link) { |
6468463a | 659 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 660 | return -1; |
87bec66b DSL |
661 | } |
662 | ||
36e43095 | 663 | mutex_lock(&acpi_link_lock); |
87bec66b | 664 | if (!link->irq.initialized) { |
36e43095 | 665 | mutex_unlock(&acpi_link_lock); |
6468463a | 666 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 667 | return -1; |
87bec66b | 668 | } |
ecc21ebe DSL |
669 | #ifdef FUTURE_USE |
670 | /* | |
671 | * The Link reference count allows us to _DISable an unused link | |
672 | * and suspend time, and set it again on resume. | |
673 | * However, 2.6.12 still has irq_router.resume | |
674 | * which blindly restores the link state. | |
675 | * So we disable the reference count method | |
676 | * to prevent duplicate acpi_pci_link_set() | |
677 | * which would harm some systems | |
678 | */ | |
4be44fcd | 679 | link->refcnt--; |
ecc21ebe | 680 | #endif |
87bec66b | 681 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
682 | "Link %s is dereferenced\n", |
683 | acpi_device_bid(link->device))); | |
87bec66b | 684 | |
1c9ca3a7 | 685 | if (link->refcnt == 0) |
383d7a11 | 686 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 687 | |
36e43095 | 688 | mutex_unlock(&acpi_link_lock); |
d550d98d | 689 | return (link->irq.active); |
87bec66b | 690 | } |
4be44fcd | 691 | |
1da177e4 LT |
692 | /* -------------------------------------------------------------------------- |
693 | Driver Interface | |
694 | -------------------------------------------------------------------------- */ | |
695 | ||
4be44fcd | 696 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 697 | { |
c9d62443 BH |
698 | int result; |
699 | struct acpi_pci_link *link; | |
700 | int i; | |
4be44fcd | 701 | int found = 0; |
1da177e4 | 702 | |
36bcbec7 | 703 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 704 | if (!link) |
d550d98d | 705 | return -ENOMEM; |
1da177e4 LT |
706 | |
707 | link->device = device; | |
1da177e4 LT |
708 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
709 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 710 | device->driver_data = link; |
1da177e4 | 711 | |
36e43095 | 712 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
713 | result = acpi_pci_link_get_possible(link); |
714 | if (result) | |
715 | goto end; | |
716 | ||
717 | /* query and set link->irq.active */ | |
718 | acpi_pci_link_get_current(link); | |
719 | ||
0dc070bb | 720 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 721 | acpi_device_bid(device)); |
1da177e4 LT |
722 | for (i = 0; i < link->irq.possible_count; i++) { |
723 | if (link->irq.active == link->irq.possible[i]) { | |
724 | printk(" *%d", link->irq.possible[i]); | |
725 | found = 1; | |
4be44fcd | 726 | } else |
1da177e4 LT |
727 | printk(" %d", link->irq.possible[i]); |
728 | } | |
729 | ||
730 | printk(")"); | |
731 | ||
732 | if (!found) | |
733 | printk(" *%d", link->irq.active); | |
734 | ||
4be44fcd | 735 | if (!link->device->status.enabled) |
1da177e4 LT |
736 | printk(", disabled."); |
737 | ||
738 | printk("\n"); | |
739 | ||
5f0dccaa | 740 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 741 | |
4be44fcd | 742 | end: |
1da177e4 | 743 | /* disable all links -- to be activated on use */ |
383d7a11 | 744 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 745 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
746 | |
747 | if (result) | |
748 | kfree(link); | |
749 | ||
d550d98d | 750 | return result; |
1da177e4 LT |
751 | } |
752 | ||
4be44fcd | 753 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 754 | { |
697a2d63 | 755 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 756 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
757 | |
758 | return 0; | |
697a2d63 LT |
759 | } |
760 | ||
4be44fcd | 761 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 762 | { |
c9d62443 | 763 | struct acpi_pci_link *link; |
1da177e4 | 764 | |
5f0dccaa | 765 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 766 | acpi_pci_link_resume(link); |
1da177e4 | 767 | } |
d550d98d | 768 | return 0; |
1da177e4 LT |
769 | } |
770 | ||
4be44fcd | 771 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 | 772 | { |
c9d62443 | 773 | struct acpi_pci_link *link; |
1da177e4 | 774 | |
50dd0969 | 775 | link = acpi_driver_data(device); |
1da177e4 | 776 | |
36e43095 | 777 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 778 | list_del(&link->list); |
36e43095 | 779 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
780 | |
781 | kfree(link); | |
d550d98d | 782 | return 0; |
1da177e4 LT |
783 | } |
784 | ||
785 | /* | |
786 | * modify acpi_irq_penalty[] from cmdline | |
787 | */ | |
788 | static int __init acpi_irq_penalty_update(char *str, int used) | |
789 | { | |
790 | int i; | |
791 | ||
792 | for (i = 0; i < 16; i++) { | |
793 | int retval; | |
794 | int irq; | |
795 | ||
4be44fcd | 796 | retval = get_option(&str, &irq); |
1da177e4 LT |
797 | |
798 | if (!retval) | |
799 | break; /* no number found */ | |
800 | ||
801 | if (irq < 0) | |
802 | continue; | |
4be44fcd | 803 | |
fa46d352 | 804 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) |
1da177e4 LT |
805 | continue; |
806 | ||
807 | if (used) | |
808 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
809 | else | |
810 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
811 | ||
812 | if (retval != 2) /* no next number */ | |
813 | break; | |
814 | } | |
815 | return 1; | |
816 | } | |
817 | ||
818 | /* | |
819 | * We'd like PNP to call this routine for the | |
820 | * single ISA_USED value for each legacy device. | |
821 | * But instead it calls us with each POSSIBLE setting. | |
822 | * There is no ISA_POSSIBLE weight, so we simply use | |
823 | * the (small) PCI_USING penalty. | |
824 | */ | |
c9c3e457 | 825 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 826 | { |
fa46d352 BH |
827 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { |
828 | if (active) | |
829 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
830 | else | |
831 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
832 | } | |
1da177e4 LT |
833 | } |
834 | ||
835 | /* | |
836 | * Over-ride default table to reserve additional IRQs for use by ISA | |
837 | * e.g. acpi_irq_isa=5 | |
838 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
839 | */ | |
840 | static int __init acpi_irq_isa(char *str) | |
841 | { | |
842 | return acpi_irq_penalty_update(str, 1); | |
843 | } | |
4be44fcd | 844 | |
1da177e4 LT |
845 | __setup("acpi_irq_isa=", acpi_irq_isa); |
846 | ||
847 | /* | |
848 | * Over-ride default table to free additional IRQs for use by PCI | |
849 | * e.g. acpi_irq_pci=7,15 | |
850 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
851 | */ | |
852 | static int __init acpi_irq_pci(char *str) | |
853 | { | |
854 | return acpi_irq_penalty_update(str, 0); | |
855 | } | |
4be44fcd | 856 | |
1da177e4 LT |
857 | __setup("acpi_irq_pci=", acpi_irq_pci); |
858 | ||
859 | static int __init acpi_irq_nobalance_set(char *str) | |
860 | { | |
861 | acpi_irq_balance = 0; | |
862 | return 1; | |
863 | } | |
4be44fcd | 864 | |
1da177e4 LT |
865 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
866 | ||
8a383ef0 | 867 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
868 | { |
869 | acpi_irq_balance = 1; | |
870 | return 1; | |
871 | } | |
1da177e4 | 872 | |
4be44fcd | 873 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 874 | |
87bec66b | 875 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 876 | static struct sysdev_class irqrouter_sysdev_class = { |
af5ca3f4 | 877 | .name = "irqrouter", |
4be44fcd | 878 | .resume = irqrouter_resume, |
1da177e4 LT |
879 | }; |
880 | ||
1da177e4 | 881 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
882 | .id = 0, |
883 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
884 | }; |
885 | ||
1da177e4 LT |
886 | static int __init irqrouter_init_sysfs(void) |
887 | { | |
888 | int error; | |
889 | ||
1da177e4 | 890 | if (acpi_disabled || acpi_noirq) |
d550d98d | 891 | return 0; |
1da177e4 LT |
892 | |
893 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
894 | if (!error) | |
895 | error = sysdev_register(&device_irqrouter); | |
896 | ||
d550d98d | 897 | return error; |
4be44fcd | 898 | } |
1da177e4 LT |
899 | |
900 | device_initcall(irqrouter_init_sysfs); | |
901 | ||
4be44fcd | 902 | static int __init acpi_pci_link_init(void) |
1da177e4 | 903 | { |
1da177e4 | 904 | if (acpi_noirq) |
d550d98d | 905 | return 0; |
1da177e4 | 906 | |
32836259 BH |
907 | if (acpi_irq_balance == -1) { |
908 | /* no command line switch: enable balancing in IOAPIC mode */ | |
909 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
910 | acpi_irq_balance = 1; | |
911 | else | |
912 | acpi_irq_balance = 0; | |
913 | } | |
914 | ||
1da177e4 | 915 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) |
d550d98d | 916 | return -ENODEV; |
1da177e4 | 917 | |
d550d98d | 918 | return 0; |
1da177e4 LT |
919 | } |
920 | ||
921 | subsys_initcall(acpi_pci_link_init); |