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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 | * | |
1da177e4 LT |
20 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
21 | * | |
22 | * TBD: | |
23 | * 1. Support more than one IRQ resource entry per link device (index). | |
24 | * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities | |
25 | * for IRQ management (e.g. start()->_SRS). | |
26 | */ | |
27 | ||
c3146df2 | 28 | #include <linux/syscore_ops.h> |
1da177e4 LT |
29 | #include <linux/kernel.h> |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
1da177e4 LT |
33 | #include <linux/spinlock.h> |
34 | #include <linux/pm.h> | |
35 | #include <linux/pci.h> | |
36e43095 | 36 | #include <linux/mutex.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
8b48463f | 38 | #include <linux/acpi.h> |
1da177e4 | 39 | |
c071b604 R |
40 | #include "internal.h" |
41 | ||
1c9ca3a7 | 42 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 43 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 44 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
45 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
46 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
47 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1c9ca3a7 BH |
48 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
49 | ||
4daeaf68 RW |
50 | static int acpi_pci_link_add(struct acpi_device *device, |
51 | const struct acpi_device_id *not_used); | |
52 | static void acpi_pci_link_remove(struct acpi_device *device); | |
1da177e4 | 53 | |
c97adf9e | 54 | static const struct acpi_device_id link_device_ids[] = { |
1ba90e3a TR |
55 | {"PNP0C0F", 0}, |
56 | {"", 0}, | |
57 | }; | |
1ba90e3a | 58 | |
4daeaf68 | 59 | static struct acpi_scan_handler pci_link_handler = { |
1ba90e3a | 60 | .ids = link_device_ids, |
4daeaf68 RW |
61 | .attach = acpi_pci_link_add, |
62 | .detach = acpi_pci_link_remove, | |
1da177e4 LT |
63 | }; |
64 | ||
87bec66b DSL |
65 | /* |
66 | * If a link is initialized, we never change its active and initialized | |
67 | * later even the link is disable. Instead, we just repick the active irq | |
68 | */ | |
1da177e4 | 69 | struct acpi_pci_link_irq { |
4be44fcd | 70 | u8 active; /* Current IRQ */ |
50eca3eb | 71 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 72 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
73 | u8 resource_type; |
74 | u8 possible_count; | |
75 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
76 | u8 initialized:1; | |
77 | u8 reserved:7; | |
1da177e4 LT |
78 | }; |
79 | ||
80 | struct acpi_pci_link { | |
5f0dccaa | 81 | struct list_head list; |
1c9ca3a7 BH |
82 | struct acpi_device *device; |
83 | struct acpi_pci_link_irq irq; | |
84 | int refcnt; | |
1da177e4 LT |
85 | }; |
86 | ||
5f0dccaa | 87 | static LIST_HEAD(acpi_link_list); |
e5685b9d | 88 | static DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 89 | |
1da177e4 LT |
90 | /* -------------------------------------------------------------------------- |
91 | PCI Link Device Management | |
92 | -------------------------------------------------------------------------- */ | |
93 | ||
94 | /* | |
95 | * set context (link) possible list from resource list | |
96 | */ | |
1c9ca3a7 BH |
97 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
98 | void *context) | |
1da177e4 | 99 | { |
50dd0969 | 100 | struct acpi_pci_link *link = context; |
c9d62443 | 101 | u32 i; |
1da177e4 | 102 | |
eca008c8 | 103 | switch (resource->type) { |
50eca3eb | 104 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 105 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 106 | return AE_OK; |
50eca3eb | 107 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
108 | { |
109 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 110 | if (!p || !p->interrupt_count) { |
4a5e3638 BH |
111 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
112 | "Blank _PRS IRQ resource\n")); | |
d550d98d | 113 | return AE_OK; |
1da177e4 | 114 | } |
4be44fcd | 115 | for (i = 0; |
50eca3eb | 116 | (i < p->interrupt_count |
4be44fcd LB |
117 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
118 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
119 | printk(KERN_WARNING PREFIX |
120 | "Invalid _PRS IRQ %d\n", | |
121 | p->interrupts[i]); | |
4be44fcd LB |
122 | continue; |
123 | } | |
124 | link->irq.possible[i] = p->interrupts[i]; | |
125 | link->irq.possible_count++; | |
126 | } | |
50eca3eb BM |
127 | link->irq.triggering = p->triggering; |
128 | link->irq.polarity = p->polarity; | |
129 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 130 | break; |
1da177e4 | 131 | } |
50eca3eb | 132 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 133 | { |
50eca3eb | 134 | struct acpi_resource_extended_irq *p = |
4be44fcd | 135 | &resource->data.extended_irq; |
50eca3eb | 136 | if (!p || !p->interrupt_count) { |
cece9296 | 137 | printk(KERN_WARNING PREFIX |
4a5e3638 | 138 | "Blank _PRS EXT IRQ resource\n"); |
d550d98d | 139 | return AE_OK; |
4be44fcd LB |
140 | } |
141 | for (i = 0; | |
50eca3eb | 142 | (i < p->interrupt_count |
4be44fcd LB |
143 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
144 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
145 | printk(KERN_WARNING PREFIX |
146 | "Invalid _PRS IRQ %d\n", | |
147 | p->interrupts[i]); | |
4be44fcd LB |
148 | continue; |
149 | } | |
150 | link->irq.possible[i] = p->interrupts[i]; | |
151 | link->irq.possible_count++; | |
1da177e4 | 152 | } |
50eca3eb BM |
153 | link->irq.triggering = p->triggering; |
154 | link->irq.polarity = p->polarity; | |
155 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 156 | break; |
1da177e4 | 157 | } |
1da177e4 | 158 | default: |
4a5e3638 BH |
159 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
160 | resource->type); | |
d550d98d | 161 | return AE_OK; |
1da177e4 LT |
162 | } |
163 | ||
d550d98d | 164 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
165 | } |
166 | ||
4be44fcd | 167 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 168 | { |
4be44fcd | 169 | acpi_status status; |
1da177e4 | 170 | |
67a71365 | 171 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 172 | acpi_pci_link_check_possible, link); |
1da177e4 | 173 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 174 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 175 | return -ENODEV; |
1da177e4 LT |
176 | } |
177 | ||
4be44fcd LB |
178 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
179 | "Found %d possible IRQs\n", | |
180 | link->irq.possible_count)); | |
1da177e4 | 181 | |
d550d98d | 182 | return 0; |
1da177e4 LT |
183 | } |
184 | ||
1c9ca3a7 BH |
185 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
186 | void *context) | |
1da177e4 | 187 | { |
c9d62443 | 188 | int *irq = context; |
1da177e4 | 189 | |
eca008c8 | 190 | switch (resource->type) { |
4a5e3638 BH |
191 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
192 | case ACPI_RESOURCE_TYPE_END_TAG: | |
193 | return AE_OK; | |
50eca3eb | 194 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
195 | { |
196 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 197 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
198 | /* |
199 | * IRQ descriptors may have no IRQ# bits set, | |
200 | * particularly those those w/ _STA disabled | |
201 | */ | |
202 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4a5e3638 | 203 | "Blank _CRS IRQ resource\n")); |
d550d98d | 204 | return AE_OK; |
4be44fcd LB |
205 | } |
206 | *irq = p->interrupts[0]; | |
207 | break; | |
1da177e4 | 208 | } |
50eca3eb | 209 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 210 | { |
50eca3eb | 211 | struct acpi_resource_extended_irq *p = |
4be44fcd | 212 | &resource->data.extended_irq; |
50eca3eb | 213 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
214 | /* |
215 | * extended IRQ descriptors must | |
216 | * return at least 1 IRQ | |
217 | */ | |
cece9296 | 218 | printk(KERN_WARNING PREFIX |
4a5e3638 | 219 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 220 | return AE_OK; |
4be44fcd LB |
221 | } |
222 | *irq = p->interrupts[0]; | |
223 | break; | |
1da177e4 | 224 | } |
d4ec6c7c | 225 | break; |
1da177e4 | 226 | default: |
4a5e3638 BH |
227 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
228 | resource->type); | |
d550d98d | 229 | return AE_OK; |
1da177e4 | 230 | } |
4a5e3638 | 231 | |
d550d98d | 232 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
233 | } |
234 | ||
235 | /* | |
236 | * Run _CRS and set link->irq.active | |
237 | * | |
238 | * return value: | |
239 | * 0 - success | |
240 | * !0 - failure | |
241 | */ | |
4be44fcd | 242 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 243 | { |
4be44fcd | 244 | int result = 0; |
c9d62443 | 245 | acpi_status status; |
4be44fcd | 246 | int irq = 0; |
1da177e4 | 247 | |
1da177e4 LT |
248 | link->irq.active = 0; |
249 | ||
250 | /* in practice, status disabled is meaningless, ignore it */ | |
251 | if (acpi_strict) { | |
252 | /* Query _STA, set link->device->status */ | |
253 | result = acpi_bus_get_status(link->device); | |
254 | if (result) { | |
6468463a | 255 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
256 | goto end; |
257 | } | |
258 | ||
259 | if (!link->device->status.enabled) { | |
260 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | } | |
264 | ||
265 | /* | |
266 | * Query and parse _CRS to get the current IRQ assignment. | |
267 | */ | |
268 | ||
67a71365 | 269 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 270 | acpi_pci_link_check_current, &irq); |
1da177e4 | 271 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 272 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
273 | result = -ENODEV; |
274 | goto end; | |
275 | } | |
276 | ||
277 | if (acpi_strict && !irq) { | |
6468463a | 278 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
279 | result = -ENODEV; |
280 | } | |
281 | ||
282 | link->irq.active = irq; | |
283 | ||
284 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
285 | ||
4be44fcd | 286 | end: |
d550d98d | 287 | return result; |
1da177e4 LT |
288 | } |
289 | ||
4be44fcd | 290 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 291 | { |
c9d62443 BH |
292 | int result; |
293 | acpi_status status; | |
1da177e4 | 294 | struct { |
4be44fcd LB |
295 | struct acpi_resource res; |
296 | struct acpi_resource end; | |
297 | } *resource; | |
298 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 299 | |
6eca4b4c | 300 | if (!irq) |
d550d98d | 301 | return -EINVAL; |
1da177e4 | 302 | |
36bcbec7 | 303 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 304 | if (!resource) |
d550d98d | 305 | return -ENOMEM; |
1da177e4 | 306 | |
4be44fcd | 307 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
308 | buffer.pointer = resource; |
309 | ||
4be44fcd | 310 | switch (link->irq.resource_type) { |
50eca3eb BM |
311 | case ACPI_RESOURCE_TYPE_IRQ: |
312 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 313 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
314 | resource->res.data.irq.triggering = link->irq.triggering; |
315 | resource->res.data.irq.polarity = | |
316 | link->irq.polarity; | |
317 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
318 | resource->res.data.irq.sharable = | |
4be44fcd | 319 | ACPI_EXCLUSIVE; |
1da177e4 | 320 | else |
50eca3eb BM |
321 | resource->res.data.irq.sharable = ACPI_SHARED; |
322 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
323 | resource->res.data.irq.interrupts[0] = irq; |
324 | break; | |
4be44fcd | 325 | |
50eca3eb BM |
326 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
327 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 328 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
329 | resource->res.data.extended_irq.producer_consumer = |
330 | ACPI_CONSUMER; | |
50eca3eb BM |
331 | resource->res.data.extended_irq.triggering = |
332 | link->irq.triggering; | |
333 | resource->res.data.extended_irq.polarity = | |
334 | link->irq.polarity; | |
335 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
336 | resource->res.data.irq.sharable = | |
4be44fcd | 337 | ACPI_EXCLUSIVE; |
1da177e4 | 338 | else |
50eca3eb BM |
339 | resource->res.data.irq.sharable = ACPI_SHARED; |
340 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
341 | resource->res.data.extended_irq.interrupts[0] = irq; |
342 | /* ignore resource_source, it's optional */ | |
343 | break; | |
344 | default: | |
6468463a | 345 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
346 | result = -EINVAL; |
347 | goto end; | |
348 | ||
349 | } | |
50eca3eb | 350 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
f084dbb9 | 351 | resource->end.length = sizeof(struct acpi_resource); |
1da177e4 LT |
352 | |
353 | /* Attempt to set the resource */ | |
67a71365 | 354 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
355 | |
356 | /* check for total failure */ | |
357 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 358 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
359 | result = -ENODEV; |
360 | goto end; | |
361 | } | |
362 | ||
363 | /* Query _STA, set device->status */ | |
364 | result = acpi_bus_get_status(link->device); | |
365 | if (result) { | |
6468463a | 366 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
367 | goto end; |
368 | } | |
369 | if (!link->device->status.enabled) { | |
cece9296 LB |
370 | printk(KERN_WARNING PREFIX |
371 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 372 | acpi_device_name(link->device), |
cece9296 | 373 | acpi_device_bid(link->device)); |
1da177e4 LT |
374 | } |
375 | ||
376 | /* Query _CRS, set link->irq.active */ | |
377 | result = acpi_pci_link_get_current(link); | |
378 | if (result) { | |
379 | goto end; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Is current setting not what we set? | |
384 | * set link->irq.active | |
385 | */ | |
386 | if (link->irq.active != irq) { | |
387 | /* | |
388 | * policy: when _CRS doesn't return what we just _SRS | |
389 | * assume _SRS worked and override _CRS value. | |
390 | */ | |
cece9296 LB |
391 | printk(KERN_WARNING PREFIX |
392 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 393 | acpi_device_name(link->device), |
cece9296 | 394 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
395 | link->irq.active = irq; |
396 | } | |
397 | ||
398 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
399 | |
400 | end: | |
1da177e4 | 401 | kfree(resource); |
d550d98d | 402 | return result; |
1da177e4 LT |
403 | } |
404 | ||
1da177e4 LT |
405 | /* -------------------------------------------------------------------------- |
406 | PCI Link IRQ Management | |
407 | -------------------------------------------------------------------------- */ | |
408 | ||
409 | /* | |
410 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
411 | * Link Devices to move the PIRQs around to minimize sharing. | |
412 | * | |
413 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
414 | * that the BIOS has already set to active. This is necessary because | |
415 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
416 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
417 | * even if acpi_irq_nobalance is set. | |
418 | * | |
419 | * A tables of penalties avoids directing PCI interrupts to well known | |
420 | * ISA IRQs. Boot params are available to over-ride the default table: | |
421 | * | |
422 | * List interrupts that are free for PCI use. | |
423 | * acpi_irq_pci=n[,m] | |
424 | * | |
425 | * List interrupts that should not be used for PCI: | |
426 | * acpi_irq_isa=n[,m] | |
427 | * | |
428 | * Note that PCI IRQ routers have a list of possible IRQs, | |
429 | * which may not include the IRQs this table says are available. | |
430 | * | |
431 | * Since this heuristic can't tell the difference between a link | |
432 | * that no device will attach to, vs. a link which may be shared | |
433 | * by multiple active devices -- it is not optimal. | |
434 | * | |
435 | * If interrupt performance is that important, get an IO-APIC system | |
436 | * with a pin dedicated to each device. Or for that matter, an MSI | |
437 | * enabled system. | |
438 | */ | |
439 | ||
440 | #define ACPI_MAX_IRQS 256 | |
441 | #define ACPI_MAX_ISA_IRQ 16 | |
442 | ||
443 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
444 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
445 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
446 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
447 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
448 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
449 | ||
450 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
451 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
452 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
453 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
454 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
455 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
456 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
457 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
458 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
459 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
460 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
461 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
462 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
463 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
464 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
465 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
466 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 467 | /* >IRQ15 */ |
1da177e4 LT |
468 | }; |
469 | ||
4be44fcd | 470 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 471 | { |
c9d62443 BH |
472 | struct acpi_pci_link *link; |
473 | int i; | |
1da177e4 | 474 | |
1da177e4 LT |
475 | /* |
476 | * Update penalties to facilitate IRQ balancing. | |
477 | */ | |
5f0dccaa | 478 | list_for_each_entry(link, &acpi_link_list, list) { |
1da177e4 LT |
479 | |
480 | /* | |
481 | * reflect the possible and active irqs in the penalty table -- | |
482 | * useful for breaking ties. | |
483 | */ | |
484 | if (link->irq.possible_count) { | |
4be44fcd LB |
485 | int penalty = |
486 | PIRQ_PENALTY_PCI_POSSIBLE / | |
487 | link->irq.possible_count; | |
1da177e4 LT |
488 | |
489 | for (i = 0; i < link->irq.possible_count; i++) { | |
490 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
491 | acpi_irq_penalty[link->irq. |
492 | possible[i]] += | |
493 | penalty; | |
1da177e4 LT |
494 | } |
495 | ||
496 | } else if (link->irq.active) { | |
4be44fcd LB |
497 | acpi_irq_penalty[link->irq.active] += |
498 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
499 | } |
500 | } | |
501 | /* Add a penalty for the SCI */ | |
cee324b1 | 502 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
d550d98d | 503 | return 0; |
1da177e4 LT |
504 | } |
505 | ||
32836259 | 506 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 507 | |
4be44fcd | 508 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 509 | { |
4be44fcd LB |
510 | int irq; |
511 | int i; | |
1da177e4 | 512 | |
87bec66b DSL |
513 | if (link->irq.initialized) { |
514 | if (link->refcnt == 0) | |
515 | /* This means the link is disabled but initialized */ | |
516 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 517 | return 0; |
87bec66b | 518 | } |
1da177e4 LT |
519 | |
520 | /* | |
521 | * search for active IRQ in list of possible IRQs. | |
522 | */ | |
523 | for (i = 0; i < link->irq.possible_count; ++i) { | |
524 | if (link->irq.active == link->irq.possible[i]) | |
525 | break; | |
526 | } | |
527 | /* | |
528 | * forget active IRQ that is not in possible list | |
529 | */ | |
530 | if (i == link->irq.possible_count) { | |
531 | if (acpi_strict) | |
cece9296 LB |
532 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
533 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
534 | link->irq.active = 0; |
535 | } | |
536 | ||
537 | /* | |
538 | * if active found, use it; else pick entry from end of possible list. | |
539 | */ | |
1c9ca3a7 | 540 | if (link->irq.active) |
1da177e4 | 541 | irq = link->irq.active; |
1c9ca3a7 | 542 | else |
1da177e4 | 543 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
544 | |
545 | if (acpi_irq_balance || !link->irq.active) { | |
546 | /* | |
547 | * Select the best IRQ. This is done in reverse to promote | |
548 | * the use of IRQs 9, 10, 11, and >15. | |
549 | */ | |
550 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
551 | if (acpi_irq_penalty[irq] > |
552 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
553 | irq = link->irq.possible[i]; |
554 | } | |
555 | } | |
556 | ||
557 | /* Attempt to enable the link device at this IRQ. */ | |
558 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
559 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
560 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 561 | acpi_device_name(link->device), |
6468463a | 562 | acpi_device_bid(link->device)); |
d550d98d | 563 | return -ENODEV; |
1da177e4 LT |
564 | } else { |
565 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4d939155 | 566 | printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
567 | acpi_device_name(link->device), |
568 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
569 | } |
570 | ||
571 | link->irq.initialized = 1; | |
d550d98d | 572 | return 0; |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
87bec66b | 576 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
577 | * success: return IRQ >= 0 |
578 | * failure: return -1 | |
579 | */ | |
1c9ca3a7 BH |
580 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
581 | int *polarity, char **name) | |
1da177e4 | 582 | { |
c9d62443 BH |
583 | int result; |
584 | struct acpi_device *device; | |
585 | struct acpi_pci_link *link; | |
1da177e4 | 586 | |
1da177e4 LT |
587 | result = acpi_bus_get_device(handle, &device); |
588 | if (result) { | |
6468463a | 589 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 590 | return -1; |
1da177e4 LT |
591 | } |
592 | ||
50dd0969 | 593 | link = acpi_driver_data(device); |
1da177e4 | 594 | if (!link) { |
6468463a | 595 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 596 | return -1; |
1da177e4 LT |
597 | } |
598 | ||
599 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
600 | if (index) { | |
6468463a | 601 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 602 | return -1; |
1da177e4 LT |
603 | } |
604 | ||
36e43095 | 605 | mutex_lock(&acpi_link_lock); |
87bec66b | 606 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 607 | mutex_unlock(&acpi_link_lock); |
d550d98d | 608 | return -1; |
87bec66b | 609 | } |
4be44fcd | 610 | |
1da177e4 | 611 | if (!link->irq.active) { |
36e43095 | 612 | mutex_unlock(&acpi_link_lock); |
6468463a | 613 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 614 | return -1; |
1da177e4 | 615 | } |
4be44fcd | 616 | link->refcnt++; |
36e43095 | 617 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 618 | |
50eca3eb BM |
619 | if (triggering) |
620 | *triggering = link->irq.triggering; | |
621 | if (polarity) | |
622 | *polarity = link->irq.polarity; | |
4be44fcd LB |
623 | if (name) |
624 | *name = acpi_device_bid(link->device); | |
87bec66b | 625 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
626 | "Link %s is referenced\n", |
627 | acpi_device_bid(link->device))); | |
d550d98d | 628 | return (link->irq.active); |
1da177e4 LT |
629 | } |
630 | ||
87bec66b DSL |
631 | /* |
632 | * We don't change link's irq information here. After it is reenabled, we | |
633 | * continue use the info | |
634 | */ | |
4be44fcd | 635 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 636 | { |
c9d62443 BH |
637 | struct acpi_device *device; |
638 | struct acpi_pci_link *link; | |
4be44fcd | 639 | acpi_status result; |
87bec66b | 640 | |
87bec66b DSL |
641 | result = acpi_bus_get_device(handle, &device); |
642 | if (result) { | |
6468463a | 643 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 644 | return -1; |
87bec66b | 645 | } |
1da177e4 | 646 | |
50dd0969 | 647 | link = acpi_driver_data(device); |
87bec66b | 648 | if (!link) { |
6468463a | 649 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 650 | return -1; |
87bec66b DSL |
651 | } |
652 | ||
36e43095 | 653 | mutex_lock(&acpi_link_lock); |
87bec66b | 654 | if (!link->irq.initialized) { |
36e43095 | 655 | mutex_unlock(&acpi_link_lock); |
6468463a | 656 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 657 | return -1; |
87bec66b | 658 | } |
ecc21ebe DSL |
659 | #ifdef FUTURE_USE |
660 | /* | |
661 | * The Link reference count allows us to _DISable an unused link | |
662 | * and suspend time, and set it again on resume. | |
663 | * However, 2.6.12 still has irq_router.resume | |
664 | * which blindly restores the link state. | |
665 | * So we disable the reference count method | |
666 | * to prevent duplicate acpi_pci_link_set() | |
667 | * which would harm some systems | |
668 | */ | |
4be44fcd | 669 | link->refcnt--; |
ecc21ebe | 670 | #endif |
87bec66b | 671 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
672 | "Link %s is dereferenced\n", |
673 | acpi_device_bid(link->device))); | |
87bec66b | 674 | |
1c9ca3a7 | 675 | if (link->refcnt == 0) |
383d7a11 | 676 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 677 | |
36e43095 | 678 | mutex_unlock(&acpi_link_lock); |
d550d98d | 679 | return (link->irq.active); |
87bec66b | 680 | } |
4be44fcd | 681 | |
1da177e4 LT |
682 | /* -------------------------------------------------------------------------- |
683 | Driver Interface | |
684 | -------------------------------------------------------------------------- */ | |
685 | ||
4daeaf68 RW |
686 | static int acpi_pci_link_add(struct acpi_device *device, |
687 | const struct acpi_device_id *not_used) | |
1da177e4 | 688 | { |
c9d62443 BH |
689 | int result; |
690 | struct acpi_pci_link *link; | |
691 | int i; | |
4be44fcd | 692 | int found = 0; |
1da177e4 | 693 | |
36bcbec7 | 694 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 695 | if (!link) |
d550d98d | 696 | return -ENOMEM; |
1da177e4 LT |
697 | |
698 | link->device = device; | |
1da177e4 LT |
699 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
700 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 701 | device->driver_data = link; |
1da177e4 | 702 | |
36e43095 | 703 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
704 | result = acpi_pci_link_get_possible(link); |
705 | if (result) | |
706 | goto end; | |
707 | ||
708 | /* query and set link->irq.active */ | |
709 | acpi_pci_link_get_current(link); | |
710 | ||
0dc070bb | 711 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 712 | acpi_device_bid(device)); |
1da177e4 LT |
713 | for (i = 0; i < link->irq.possible_count; i++) { |
714 | if (link->irq.active == link->irq.possible[i]) { | |
be96447e | 715 | printk(KERN_CONT " *%d", link->irq.possible[i]); |
1da177e4 | 716 | found = 1; |
4be44fcd | 717 | } else |
be96447e | 718 | printk(KERN_CONT " %d", link->irq.possible[i]); |
1da177e4 LT |
719 | } |
720 | ||
be96447e | 721 | printk(KERN_CONT ")"); |
1da177e4 LT |
722 | |
723 | if (!found) | |
be96447e | 724 | printk(KERN_CONT " *%d", link->irq.active); |
1da177e4 | 725 | |
4be44fcd | 726 | if (!link->device->status.enabled) |
be96447e | 727 | printk(KERN_CONT ", disabled."); |
1da177e4 | 728 | |
be96447e | 729 | printk(KERN_CONT "\n"); |
1da177e4 | 730 | |
5f0dccaa | 731 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 732 | |
4be44fcd | 733 | end: |
1da177e4 | 734 | /* disable all links -- to be activated on use */ |
383d7a11 | 735 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 736 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
737 | |
738 | if (result) | |
739 | kfree(link); | |
740 | ||
4daeaf68 | 741 | return result < 0 ? result : 1; |
1da177e4 LT |
742 | } |
743 | ||
4be44fcd | 744 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 745 | { |
697a2d63 | 746 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 747 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
748 | |
749 | return 0; | |
697a2d63 LT |
750 | } |
751 | ||
c3146df2 | 752 | static void irqrouter_resume(void) |
1da177e4 | 753 | { |
c9d62443 | 754 | struct acpi_pci_link *link; |
1da177e4 | 755 | |
5f0dccaa | 756 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 757 | acpi_pci_link_resume(link); |
1da177e4 | 758 | } |
1da177e4 LT |
759 | } |
760 | ||
4daeaf68 | 761 | static void acpi_pci_link_remove(struct acpi_device *device) |
1da177e4 | 762 | { |
c9d62443 | 763 | struct acpi_pci_link *link; |
1da177e4 | 764 | |
50dd0969 | 765 | link = acpi_driver_data(device); |
1da177e4 | 766 | |
36e43095 | 767 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 768 | list_del(&link->list); |
36e43095 | 769 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
770 | |
771 | kfree(link); | |
1da177e4 LT |
772 | } |
773 | ||
774 | /* | |
775 | * modify acpi_irq_penalty[] from cmdline | |
776 | */ | |
777 | static int __init acpi_irq_penalty_update(char *str, int used) | |
778 | { | |
779 | int i; | |
780 | ||
781 | for (i = 0; i < 16; i++) { | |
782 | int retval; | |
783 | int irq; | |
784 | ||
4be44fcd | 785 | retval = get_option(&str, &irq); |
1da177e4 LT |
786 | |
787 | if (!retval) | |
788 | break; /* no number found */ | |
789 | ||
790 | if (irq < 0) | |
791 | continue; | |
4be44fcd | 792 | |
fa46d352 | 793 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) |
1da177e4 LT |
794 | continue; |
795 | ||
796 | if (used) | |
797 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
798 | else | |
799 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
800 | ||
801 | if (retval != 2) /* no next number */ | |
802 | break; | |
803 | } | |
804 | return 1; | |
805 | } | |
806 | ||
807 | /* | |
808 | * We'd like PNP to call this routine for the | |
809 | * single ISA_USED value for each legacy device. | |
810 | * But instead it calls us with each POSSIBLE setting. | |
811 | * There is no ISA_POSSIBLE weight, so we simply use | |
812 | * the (small) PCI_USING penalty. | |
813 | */ | |
c9c3e457 | 814 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 815 | { |
fa46d352 BH |
816 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { |
817 | if (active) | |
818 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
819 | else | |
820 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
821 | } | |
1da177e4 LT |
822 | } |
823 | ||
5d0ddfeb JL |
824 | /* |
825 | * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict with | |
826 | * PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be use for | |
827 | * PCI IRQs. | |
828 | */ | |
829 | void acpi_penalize_sci_irq(int irq, int trigger, int polarity) | |
830 | { | |
831 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { | |
832 | if (trigger != ACPI_MADT_TRIGGER_LEVEL || | |
833 | polarity != ACPI_MADT_POLARITY_ACTIVE_LOW) | |
834 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS; | |
835 | else | |
836 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
837 | } | |
838 | } | |
839 | ||
1da177e4 LT |
840 | /* |
841 | * Over-ride default table to reserve additional IRQs for use by ISA | |
842 | * e.g. acpi_irq_isa=5 | |
843 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
844 | */ | |
845 | static int __init acpi_irq_isa(char *str) | |
846 | { | |
847 | return acpi_irq_penalty_update(str, 1); | |
848 | } | |
4be44fcd | 849 | |
1da177e4 LT |
850 | __setup("acpi_irq_isa=", acpi_irq_isa); |
851 | ||
852 | /* | |
853 | * Over-ride default table to free additional IRQs for use by PCI | |
854 | * e.g. acpi_irq_pci=7,15 | |
855 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
856 | */ | |
857 | static int __init acpi_irq_pci(char *str) | |
858 | { | |
859 | return acpi_irq_penalty_update(str, 0); | |
860 | } | |
4be44fcd | 861 | |
1da177e4 LT |
862 | __setup("acpi_irq_pci=", acpi_irq_pci); |
863 | ||
864 | static int __init acpi_irq_nobalance_set(char *str) | |
865 | { | |
866 | acpi_irq_balance = 0; | |
867 | return 1; | |
868 | } | |
4be44fcd | 869 | |
1da177e4 LT |
870 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
871 | ||
8a383ef0 | 872 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
873 | { |
874 | acpi_irq_balance = 1; | |
875 | return 1; | |
876 | } | |
1da177e4 | 877 | |
4be44fcd | 878 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 879 | |
c3146df2 | 880 | static struct syscore_ops irqrouter_syscore_ops = { |
4be44fcd | 881 | .resume = irqrouter_resume, |
1da177e4 LT |
882 | }; |
883 | ||
4daeaf68 | 884 | void __init acpi_pci_link_init(void) |
1da177e4 | 885 | { |
1da177e4 | 886 | if (acpi_noirq) |
4daeaf68 | 887 | return; |
1da177e4 | 888 | |
32836259 BH |
889 | if (acpi_irq_balance == -1) { |
890 | /* no command line switch: enable balancing in IOAPIC mode */ | |
891 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
892 | acpi_irq_balance = 1; | |
893 | else | |
894 | acpi_irq_balance = 0; | |
895 | } | |
4daeaf68 RW |
896 | register_syscore_ops(&irqrouter_syscore_ops); |
897 | acpi_scan_add_handler(&pci_link_handler); | |
1da177e4 | 898 | } |