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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 { | |
5f0dccaa | 89 | struct list_head list; |
1c9ca3a7 BH |
90 | struct acpi_device *device; |
91 | struct acpi_pci_link_irq irq; | |
92 | int refcnt; | |
1da177e4 LT |
93 | }; |
94 | ||
5f0dccaa | 95 | static LIST_HEAD(acpi_link_list); |
e5685b9d | 96 | static DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 97 | |
1da177e4 LT |
98 | /* -------------------------------------------------------------------------- |
99 | PCI Link Device Management | |
100 | -------------------------------------------------------------------------- */ | |
101 | ||
102 | /* | |
103 | * set context (link) possible list from resource list | |
104 | */ | |
1c9ca3a7 BH |
105 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
106 | void *context) | |
1da177e4 | 107 | { |
50dd0969 | 108 | struct acpi_pci_link *link = context; |
c9d62443 | 109 | u32 i; |
1da177e4 | 110 | |
eca008c8 | 111 | switch (resource->type) { |
50eca3eb | 112 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 113 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 114 | return AE_OK; |
50eca3eb | 115 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
116 | { |
117 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 118 | if (!p || !p->interrupt_count) { |
4a5e3638 BH |
119 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
120 | "Blank _PRS IRQ resource\n")); | |
d550d98d | 121 | return AE_OK; |
1da177e4 | 122 | } |
4be44fcd | 123 | for (i = 0; |
50eca3eb | 124 | (i < p->interrupt_count |
4be44fcd LB |
125 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
126 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
127 | printk(KERN_WARNING PREFIX |
128 | "Invalid _PRS IRQ %d\n", | |
129 | p->interrupts[i]); | |
4be44fcd LB |
130 | continue; |
131 | } | |
132 | link->irq.possible[i] = p->interrupts[i]; | |
133 | link->irq.possible_count++; | |
134 | } | |
50eca3eb BM |
135 | link->irq.triggering = p->triggering; |
136 | link->irq.polarity = p->polarity; | |
137 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 138 | break; |
1da177e4 | 139 | } |
50eca3eb | 140 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 141 | { |
50eca3eb | 142 | struct acpi_resource_extended_irq *p = |
4be44fcd | 143 | &resource->data.extended_irq; |
50eca3eb | 144 | if (!p || !p->interrupt_count) { |
cece9296 | 145 | printk(KERN_WARNING PREFIX |
4a5e3638 | 146 | "Blank _PRS EXT IRQ resource\n"); |
d550d98d | 147 | return AE_OK; |
4be44fcd LB |
148 | } |
149 | for (i = 0; | |
50eca3eb | 150 | (i < p->interrupt_count |
4be44fcd LB |
151 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
152 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
153 | printk(KERN_WARNING PREFIX |
154 | "Invalid _PRS IRQ %d\n", | |
155 | p->interrupts[i]); | |
4be44fcd LB |
156 | continue; |
157 | } | |
158 | link->irq.possible[i] = p->interrupts[i]; | |
159 | link->irq.possible_count++; | |
1da177e4 | 160 | } |
50eca3eb BM |
161 | link->irq.triggering = p->triggering; |
162 | link->irq.polarity = p->polarity; | |
163 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 164 | break; |
1da177e4 | 165 | } |
1da177e4 | 166 | default: |
4a5e3638 BH |
167 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
168 | resource->type); | |
d550d98d | 169 | return AE_OK; |
1da177e4 LT |
170 | } |
171 | ||
d550d98d | 172 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
173 | } |
174 | ||
4be44fcd | 175 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 176 | { |
4be44fcd | 177 | acpi_status status; |
1da177e4 | 178 | |
67a71365 | 179 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 180 | acpi_pci_link_check_possible, link); |
1da177e4 | 181 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 182 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 183 | return -ENODEV; |
1da177e4 LT |
184 | } |
185 | ||
4be44fcd LB |
186 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
187 | "Found %d possible IRQs\n", | |
188 | link->irq.possible_count)); | |
1da177e4 | 189 | |
d550d98d | 190 | return 0; |
1da177e4 LT |
191 | } |
192 | ||
1c9ca3a7 BH |
193 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
194 | void *context) | |
1da177e4 | 195 | { |
c9d62443 | 196 | int *irq = context; |
1da177e4 | 197 | |
eca008c8 | 198 | switch (resource->type) { |
4a5e3638 BH |
199 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
200 | case ACPI_RESOURCE_TYPE_END_TAG: | |
201 | return AE_OK; | |
50eca3eb | 202 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
203 | { |
204 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 205 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
206 | /* |
207 | * IRQ descriptors may have no IRQ# bits set, | |
208 | * particularly those those w/ _STA disabled | |
209 | */ | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4a5e3638 | 211 | "Blank _CRS IRQ resource\n")); |
d550d98d | 212 | return AE_OK; |
4be44fcd LB |
213 | } |
214 | *irq = p->interrupts[0]; | |
215 | break; | |
1da177e4 | 216 | } |
50eca3eb | 217 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 218 | { |
50eca3eb | 219 | struct acpi_resource_extended_irq *p = |
4be44fcd | 220 | &resource->data.extended_irq; |
50eca3eb | 221 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
222 | /* |
223 | * extended IRQ descriptors must | |
224 | * return at least 1 IRQ | |
225 | */ | |
cece9296 | 226 | printk(KERN_WARNING PREFIX |
4a5e3638 | 227 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 228 | return AE_OK; |
4be44fcd LB |
229 | } |
230 | *irq = p->interrupts[0]; | |
231 | break; | |
1da177e4 | 232 | } |
d4ec6c7c | 233 | break; |
1da177e4 | 234 | default: |
4a5e3638 BH |
235 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
236 | resource->type); | |
d550d98d | 237 | return AE_OK; |
1da177e4 | 238 | } |
4a5e3638 | 239 | |
d550d98d | 240 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
241 | } |
242 | ||
243 | /* | |
244 | * Run _CRS and set link->irq.active | |
245 | * | |
246 | * return value: | |
247 | * 0 - success | |
248 | * !0 - failure | |
249 | */ | |
4be44fcd | 250 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 251 | { |
4be44fcd | 252 | int result = 0; |
c9d62443 | 253 | acpi_status status; |
4be44fcd | 254 | int irq = 0; |
1da177e4 | 255 | |
1da177e4 LT |
256 | link->irq.active = 0; |
257 | ||
258 | /* in practice, status disabled is meaningless, ignore it */ | |
259 | if (acpi_strict) { | |
260 | /* Query _STA, set link->device->status */ | |
261 | result = acpi_bus_get_status(link->device); | |
262 | if (result) { | |
6468463a | 263 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
264 | goto end; |
265 | } | |
266 | ||
267 | if (!link->device->status.enabled) { | |
268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 269 | return 0; |
1da177e4 LT |
270 | } |
271 | } | |
272 | ||
273 | /* | |
274 | * Query and parse _CRS to get the current IRQ assignment. | |
275 | */ | |
276 | ||
67a71365 | 277 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 278 | acpi_pci_link_check_current, &irq); |
1da177e4 | 279 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 280 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
281 | result = -ENODEV; |
282 | goto end; | |
283 | } | |
284 | ||
285 | if (acpi_strict && !irq) { | |
6468463a | 286 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
287 | result = -ENODEV; |
288 | } | |
289 | ||
290 | link->irq.active = irq; | |
291 | ||
292 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
293 | ||
4be44fcd | 294 | end: |
d550d98d | 295 | return result; |
1da177e4 LT |
296 | } |
297 | ||
4be44fcd | 298 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 299 | { |
c9d62443 BH |
300 | int result; |
301 | acpi_status status; | |
1da177e4 | 302 | struct { |
4be44fcd LB |
303 | struct acpi_resource res; |
304 | struct acpi_resource end; | |
305 | } *resource; | |
306 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 307 | |
6eca4b4c | 308 | if (!irq) |
d550d98d | 309 | return -EINVAL; |
1da177e4 | 310 | |
36bcbec7 | 311 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 312 | if (!resource) |
d550d98d | 313 | return -ENOMEM; |
1da177e4 | 314 | |
4be44fcd | 315 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
316 | buffer.pointer = resource; |
317 | ||
4be44fcd | 318 | switch (link->irq.resource_type) { |
50eca3eb BM |
319 | case ACPI_RESOURCE_TYPE_IRQ: |
320 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 321 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
322 | resource->res.data.irq.triggering = link->irq.triggering; |
323 | resource->res.data.irq.polarity = | |
324 | link->irq.polarity; | |
325 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
326 | resource->res.data.irq.sharable = | |
4be44fcd | 327 | ACPI_EXCLUSIVE; |
1da177e4 | 328 | else |
50eca3eb BM |
329 | resource->res.data.irq.sharable = ACPI_SHARED; |
330 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
331 | resource->res.data.irq.interrupts[0] = irq; |
332 | break; | |
4be44fcd | 333 | |
50eca3eb BM |
334 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
335 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 336 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
337 | resource->res.data.extended_irq.producer_consumer = |
338 | ACPI_CONSUMER; | |
50eca3eb BM |
339 | resource->res.data.extended_irq.triggering = |
340 | link->irq.triggering; | |
341 | resource->res.data.extended_irq.polarity = | |
342 | link->irq.polarity; | |
343 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
344 | resource->res.data.irq.sharable = | |
4be44fcd | 345 | ACPI_EXCLUSIVE; |
1da177e4 | 346 | else |
50eca3eb BM |
347 | resource->res.data.irq.sharable = ACPI_SHARED; |
348 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
349 | resource->res.data.extended_irq.interrupts[0] = irq; |
350 | /* ignore resource_source, it's optional */ | |
351 | break; | |
352 | default: | |
6468463a | 353 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
354 | result = -EINVAL; |
355 | goto end; | |
356 | ||
357 | } | |
50eca3eb | 358 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
359 | |
360 | /* Attempt to set the resource */ | |
67a71365 | 361 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
362 | |
363 | /* check for total failure */ | |
364 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 365 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
366 | result = -ENODEV; |
367 | goto end; | |
368 | } | |
369 | ||
370 | /* Query _STA, set device->status */ | |
371 | result = acpi_bus_get_status(link->device); | |
372 | if (result) { | |
6468463a | 373 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
374 | goto end; |
375 | } | |
376 | if (!link->device->status.enabled) { | |
cece9296 LB |
377 | printk(KERN_WARNING PREFIX |
378 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 379 | acpi_device_name(link->device), |
cece9296 | 380 | acpi_device_bid(link->device)); |
1da177e4 LT |
381 | } |
382 | ||
383 | /* Query _CRS, set link->irq.active */ | |
384 | result = acpi_pci_link_get_current(link); | |
385 | if (result) { | |
386 | goto end; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Is current setting not what we set? | |
391 | * set link->irq.active | |
392 | */ | |
393 | if (link->irq.active != irq) { | |
394 | /* | |
395 | * policy: when _CRS doesn't return what we just _SRS | |
396 | * assume _SRS worked and override _CRS value. | |
397 | */ | |
cece9296 LB |
398 | printk(KERN_WARNING PREFIX |
399 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 400 | acpi_device_name(link->device), |
cece9296 | 401 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
402 | link->irq.active = irq; |
403 | } | |
404 | ||
405 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
406 | |
407 | end: | |
1da177e4 | 408 | kfree(resource); |
d550d98d | 409 | return result; |
1da177e4 LT |
410 | } |
411 | ||
1da177e4 LT |
412 | /* -------------------------------------------------------------------------- |
413 | PCI Link IRQ Management | |
414 | -------------------------------------------------------------------------- */ | |
415 | ||
416 | /* | |
417 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
418 | * Link Devices to move the PIRQs around to minimize sharing. | |
419 | * | |
420 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
421 | * that the BIOS has already set to active. This is necessary because | |
422 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
423 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
424 | * even if acpi_irq_nobalance is set. | |
425 | * | |
426 | * A tables of penalties avoids directing PCI interrupts to well known | |
427 | * ISA IRQs. Boot params are available to over-ride the default table: | |
428 | * | |
429 | * List interrupts that are free for PCI use. | |
430 | * acpi_irq_pci=n[,m] | |
431 | * | |
432 | * List interrupts that should not be used for PCI: | |
433 | * acpi_irq_isa=n[,m] | |
434 | * | |
435 | * Note that PCI IRQ routers have a list of possible IRQs, | |
436 | * which may not include the IRQs this table says are available. | |
437 | * | |
438 | * Since this heuristic can't tell the difference between a link | |
439 | * that no device will attach to, vs. a link which may be shared | |
440 | * by multiple active devices -- it is not optimal. | |
441 | * | |
442 | * If interrupt performance is that important, get an IO-APIC system | |
443 | * with a pin dedicated to each device. Or for that matter, an MSI | |
444 | * enabled system. | |
445 | */ | |
446 | ||
447 | #define ACPI_MAX_IRQS 256 | |
448 | #define ACPI_MAX_ISA_IRQ 16 | |
449 | ||
450 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
451 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
452 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
453 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
454 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
455 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
456 | ||
457 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
458 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
459 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
460 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
461 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
462 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
463 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
464 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
465 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
466 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
467 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
468 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
469 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
470 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
471 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
472 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
473 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 474 | /* >IRQ15 */ |
1da177e4 LT |
475 | }; |
476 | ||
4be44fcd | 477 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 478 | { |
c9d62443 BH |
479 | struct acpi_pci_link *link; |
480 | int i; | |
1da177e4 | 481 | |
1da177e4 LT |
482 | /* |
483 | * Update penalties to facilitate IRQ balancing. | |
484 | */ | |
5f0dccaa | 485 | list_for_each_entry(link, &acpi_link_list, list) { |
1da177e4 LT |
486 | |
487 | /* | |
488 | * reflect the possible and active irqs in the penalty table -- | |
489 | * useful for breaking ties. | |
490 | */ | |
491 | if (link->irq.possible_count) { | |
4be44fcd LB |
492 | int penalty = |
493 | PIRQ_PENALTY_PCI_POSSIBLE / | |
494 | link->irq.possible_count; | |
1da177e4 LT |
495 | |
496 | for (i = 0; i < link->irq.possible_count; i++) { | |
497 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
498 | acpi_irq_penalty[link->irq. |
499 | possible[i]] += | |
500 | penalty; | |
1da177e4 LT |
501 | } |
502 | ||
503 | } else if (link->irq.active) { | |
4be44fcd LB |
504 | acpi_irq_penalty[link->irq.active] += |
505 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
506 | } |
507 | } | |
508 | /* Add a penalty for the SCI */ | |
cee324b1 | 509 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
d550d98d | 510 | return 0; |
1da177e4 LT |
511 | } |
512 | ||
32836259 | 513 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 514 | |
4be44fcd | 515 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 516 | { |
4be44fcd LB |
517 | int irq; |
518 | int i; | |
1da177e4 | 519 | |
87bec66b DSL |
520 | if (link->irq.initialized) { |
521 | if (link->refcnt == 0) | |
522 | /* This means the link is disabled but initialized */ | |
523 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 524 | return 0; |
87bec66b | 525 | } |
1da177e4 LT |
526 | |
527 | /* | |
528 | * search for active IRQ in list of possible IRQs. | |
529 | */ | |
530 | for (i = 0; i < link->irq.possible_count; ++i) { | |
531 | if (link->irq.active == link->irq.possible[i]) | |
532 | break; | |
533 | } | |
534 | /* | |
535 | * forget active IRQ that is not in possible list | |
536 | */ | |
537 | if (i == link->irq.possible_count) { | |
538 | if (acpi_strict) | |
cece9296 LB |
539 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
540 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
541 | link->irq.active = 0; |
542 | } | |
543 | ||
544 | /* | |
545 | * if active found, use it; else pick entry from end of possible list. | |
546 | */ | |
1c9ca3a7 | 547 | if (link->irq.active) |
1da177e4 | 548 | irq = link->irq.active; |
1c9ca3a7 | 549 | else |
1da177e4 | 550 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
551 | |
552 | if (acpi_irq_balance || !link->irq.active) { | |
553 | /* | |
554 | * Select the best IRQ. This is done in reverse to promote | |
555 | * the use of IRQs 9, 10, 11, and >15. | |
556 | */ | |
557 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
558 | if (acpi_irq_penalty[irq] > |
559 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
560 | irq = link->irq.possible[i]; |
561 | } | |
562 | } | |
563 | ||
564 | /* Attempt to enable the link device at this IRQ. */ | |
565 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
566 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
567 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 568 | acpi_device_name(link->device), |
6468463a | 569 | acpi_device_bid(link->device)); |
d550d98d | 570 | return -ENODEV; |
1da177e4 LT |
571 | } else { |
572 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4d939155 | 573 | printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
574 | acpi_device_name(link->device), |
575 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
576 | } |
577 | ||
578 | link->irq.initialized = 1; | |
d550d98d | 579 | return 0; |
1da177e4 LT |
580 | } |
581 | ||
582 | /* | |
87bec66b | 583 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
584 | * success: return IRQ >= 0 |
585 | * failure: return -1 | |
586 | */ | |
1c9ca3a7 BH |
587 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
588 | int *polarity, char **name) | |
1da177e4 | 589 | { |
c9d62443 BH |
590 | int result; |
591 | struct acpi_device *device; | |
592 | struct acpi_pci_link *link; | |
1da177e4 | 593 | |
1da177e4 LT |
594 | result = acpi_bus_get_device(handle, &device); |
595 | if (result) { | |
6468463a | 596 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 597 | return -1; |
1da177e4 LT |
598 | } |
599 | ||
50dd0969 | 600 | link = acpi_driver_data(device); |
1da177e4 | 601 | if (!link) { |
6468463a | 602 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 603 | return -1; |
1da177e4 LT |
604 | } |
605 | ||
606 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
607 | if (index) { | |
6468463a | 608 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 609 | return -1; |
1da177e4 LT |
610 | } |
611 | ||
36e43095 | 612 | mutex_lock(&acpi_link_lock); |
87bec66b | 613 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 614 | mutex_unlock(&acpi_link_lock); |
d550d98d | 615 | return -1; |
87bec66b | 616 | } |
4be44fcd | 617 | |
1da177e4 | 618 | if (!link->irq.active) { |
36e43095 | 619 | mutex_unlock(&acpi_link_lock); |
6468463a | 620 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 621 | return -1; |
1da177e4 | 622 | } |
4be44fcd | 623 | link->refcnt++; |
36e43095 | 624 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 625 | |
50eca3eb BM |
626 | if (triggering) |
627 | *triggering = link->irq.triggering; | |
628 | if (polarity) | |
629 | *polarity = link->irq.polarity; | |
4be44fcd LB |
630 | if (name) |
631 | *name = acpi_device_bid(link->device); | |
87bec66b | 632 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
633 | "Link %s is referenced\n", |
634 | acpi_device_bid(link->device))); | |
d550d98d | 635 | return (link->irq.active); |
1da177e4 LT |
636 | } |
637 | ||
87bec66b DSL |
638 | /* |
639 | * We don't change link's irq information here. After it is reenabled, we | |
640 | * continue use the info | |
641 | */ | |
4be44fcd | 642 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 643 | { |
c9d62443 BH |
644 | struct acpi_device *device; |
645 | struct acpi_pci_link *link; | |
4be44fcd | 646 | acpi_status result; |
87bec66b | 647 | |
87bec66b DSL |
648 | result = acpi_bus_get_device(handle, &device); |
649 | if (result) { | |
6468463a | 650 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 651 | return -1; |
87bec66b | 652 | } |
1da177e4 | 653 | |
50dd0969 | 654 | link = acpi_driver_data(device); |
87bec66b | 655 | if (!link) { |
6468463a | 656 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 657 | return -1; |
87bec66b DSL |
658 | } |
659 | ||
36e43095 | 660 | mutex_lock(&acpi_link_lock); |
87bec66b | 661 | if (!link->irq.initialized) { |
36e43095 | 662 | mutex_unlock(&acpi_link_lock); |
6468463a | 663 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 664 | return -1; |
87bec66b | 665 | } |
ecc21ebe DSL |
666 | #ifdef FUTURE_USE |
667 | /* | |
668 | * The Link reference count allows us to _DISable an unused link | |
669 | * and suspend time, and set it again on resume. | |
670 | * However, 2.6.12 still has irq_router.resume | |
671 | * which blindly restores the link state. | |
672 | * So we disable the reference count method | |
673 | * to prevent duplicate acpi_pci_link_set() | |
674 | * which would harm some systems | |
675 | */ | |
4be44fcd | 676 | link->refcnt--; |
ecc21ebe | 677 | #endif |
87bec66b | 678 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
679 | "Link %s is dereferenced\n", |
680 | acpi_device_bid(link->device))); | |
87bec66b | 681 | |
1c9ca3a7 | 682 | if (link->refcnt == 0) |
383d7a11 | 683 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 684 | |
36e43095 | 685 | mutex_unlock(&acpi_link_lock); |
d550d98d | 686 | return (link->irq.active); |
87bec66b | 687 | } |
4be44fcd | 688 | |
1da177e4 LT |
689 | /* -------------------------------------------------------------------------- |
690 | Driver Interface | |
691 | -------------------------------------------------------------------------- */ | |
692 | ||
4be44fcd | 693 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 694 | { |
c9d62443 BH |
695 | int result; |
696 | struct acpi_pci_link *link; | |
697 | int i; | |
4be44fcd | 698 | int found = 0; |
1da177e4 | 699 | |
36bcbec7 | 700 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 701 | if (!link) |
d550d98d | 702 | return -ENOMEM; |
1da177e4 LT |
703 | |
704 | link->device = device; | |
1da177e4 LT |
705 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
706 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 707 | device->driver_data = link; |
1da177e4 | 708 | |
36e43095 | 709 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
710 | result = acpi_pci_link_get_possible(link); |
711 | if (result) | |
712 | goto end; | |
713 | ||
714 | /* query and set link->irq.active */ | |
715 | acpi_pci_link_get_current(link); | |
716 | ||
0dc070bb | 717 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 718 | acpi_device_bid(device)); |
1da177e4 LT |
719 | for (i = 0; i < link->irq.possible_count; i++) { |
720 | if (link->irq.active == link->irq.possible[i]) { | |
721 | printk(" *%d", link->irq.possible[i]); | |
722 | found = 1; | |
4be44fcd | 723 | } else |
1da177e4 LT |
724 | printk(" %d", link->irq.possible[i]); |
725 | } | |
726 | ||
727 | printk(")"); | |
728 | ||
729 | if (!found) | |
730 | printk(" *%d", link->irq.active); | |
731 | ||
4be44fcd | 732 | if (!link->device->status.enabled) |
1da177e4 LT |
733 | printk(", disabled."); |
734 | ||
735 | printk("\n"); | |
736 | ||
5f0dccaa | 737 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 738 | |
4be44fcd | 739 | end: |
1da177e4 | 740 | /* disable all links -- to be activated on use */ |
383d7a11 | 741 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 742 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
743 | |
744 | if (result) | |
745 | kfree(link); | |
746 | ||
d550d98d | 747 | return result; |
1da177e4 LT |
748 | } |
749 | ||
4be44fcd | 750 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 751 | { |
697a2d63 | 752 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 753 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
754 | |
755 | return 0; | |
697a2d63 LT |
756 | } |
757 | ||
4be44fcd | 758 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 759 | { |
c9d62443 | 760 | struct acpi_pci_link *link; |
1da177e4 | 761 | |
5f0dccaa | 762 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 763 | acpi_pci_link_resume(link); |
1da177e4 | 764 | } |
d550d98d | 765 | return 0; |
1da177e4 LT |
766 | } |
767 | ||
4be44fcd | 768 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 | 769 | { |
c9d62443 | 770 | struct acpi_pci_link *link; |
1da177e4 | 771 | |
50dd0969 | 772 | link = acpi_driver_data(device); |
1da177e4 | 773 | |
36e43095 | 774 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 775 | list_del(&link->list); |
36e43095 | 776 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
777 | |
778 | kfree(link); | |
d550d98d | 779 | return 0; |
1da177e4 LT |
780 | } |
781 | ||
782 | /* | |
783 | * modify acpi_irq_penalty[] from cmdline | |
784 | */ | |
785 | static int __init acpi_irq_penalty_update(char *str, int used) | |
786 | { | |
787 | int i; | |
788 | ||
789 | for (i = 0; i < 16; i++) { | |
790 | int retval; | |
791 | int irq; | |
792 | ||
4be44fcd | 793 | retval = get_option(&str, &irq); |
1da177e4 LT |
794 | |
795 | if (!retval) | |
796 | break; /* no number found */ | |
797 | ||
798 | if (irq < 0) | |
799 | continue; | |
4be44fcd | 800 | |
fa46d352 | 801 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) |
1da177e4 LT |
802 | continue; |
803 | ||
804 | if (used) | |
805 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
806 | else | |
807 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
808 | ||
809 | if (retval != 2) /* no next number */ | |
810 | break; | |
811 | } | |
812 | return 1; | |
813 | } | |
814 | ||
815 | /* | |
816 | * We'd like PNP to call this routine for the | |
817 | * single ISA_USED value for each legacy device. | |
818 | * But instead it calls us with each POSSIBLE setting. | |
819 | * There is no ISA_POSSIBLE weight, so we simply use | |
820 | * the (small) PCI_USING penalty. | |
821 | */ | |
c9c3e457 | 822 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 823 | { |
fa46d352 BH |
824 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { |
825 | if (active) | |
826 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
827 | else | |
828 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
829 | } | |
1da177e4 LT |
830 | } |
831 | ||
832 | /* | |
833 | * Over-ride default table to reserve additional IRQs for use by ISA | |
834 | * e.g. acpi_irq_isa=5 | |
835 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
836 | */ | |
837 | static int __init acpi_irq_isa(char *str) | |
838 | { | |
839 | return acpi_irq_penalty_update(str, 1); | |
840 | } | |
4be44fcd | 841 | |
1da177e4 LT |
842 | __setup("acpi_irq_isa=", acpi_irq_isa); |
843 | ||
844 | /* | |
845 | * Over-ride default table to free additional IRQs for use by PCI | |
846 | * e.g. acpi_irq_pci=7,15 | |
847 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
848 | */ | |
849 | static int __init acpi_irq_pci(char *str) | |
850 | { | |
851 | return acpi_irq_penalty_update(str, 0); | |
852 | } | |
4be44fcd | 853 | |
1da177e4 LT |
854 | __setup("acpi_irq_pci=", acpi_irq_pci); |
855 | ||
856 | static int __init acpi_irq_nobalance_set(char *str) | |
857 | { | |
858 | acpi_irq_balance = 0; | |
859 | return 1; | |
860 | } | |
4be44fcd | 861 | |
1da177e4 LT |
862 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
863 | ||
8a383ef0 | 864 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
865 | { |
866 | acpi_irq_balance = 1; | |
867 | return 1; | |
868 | } | |
1da177e4 | 869 | |
4be44fcd | 870 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 871 | |
87bec66b | 872 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 873 | static struct sysdev_class irqrouter_sysdev_class = { |
af5ca3f4 | 874 | .name = "irqrouter", |
4be44fcd | 875 | .resume = irqrouter_resume, |
1da177e4 LT |
876 | }; |
877 | ||
1da177e4 | 878 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
879 | .id = 0, |
880 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
881 | }; |
882 | ||
1da177e4 LT |
883 | static int __init irqrouter_init_sysfs(void) |
884 | { | |
885 | int error; | |
886 | ||
1da177e4 | 887 | if (acpi_disabled || acpi_noirq) |
d550d98d | 888 | return 0; |
1da177e4 LT |
889 | |
890 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
891 | if (!error) | |
892 | error = sysdev_register(&device_irqrouter); | |
893 | ||
d550d98d | 894 | return error; |
4be44fcd | 895 | } |
1da177e4 LT |
896 | |
897 | device_initcall(irqrouter_init_sysfs); | |
898 | ||
4be44fcd | 899 | static int __init acpi_pci_link_init(void) |
1da177e4 | 900 | { |
1da177e4 | 901 | if (acpi_noirq) |
d550d98d | 902 | return 0; |
1da177e4 | 903 | |
32836259 BH |
904 | if (acpi_irq_balance == -1) { |
905 | /* no command line switch: enable balancing in IOAPIC mode */ | |
906 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
907 | acpi_irq_balance = 1; | |
908 | else | |
909 | acpi_irq_balance = 0; | |
910 | } | |
911 | ||
1da177e4 | 912 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) |
d550d98d | 913 | return -ENODEV; |
1da177e4 | 914 | |
d550d98d | 915 | return 0; |
1da177e4 LT |
916 | } |
917 | ||
918 | subsys_initcall(acpi_pci_link_init); |