Commit | Line | Data |
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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 | ||
c3146df2 | 32 | #include <linux/syscore_ops.h> |
1da177e4 LT |
33 | #include <linux/kernel.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/types.h> | |
1da177e4 LT |
37 | #include <linux/spinlock.h> |
38 | #include <linux/pm.h> | |
39 | #include <linux/pci.h> | |
36e43095 | 40 | #include <linux/mutex.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 LT |
42 | |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
45 | ||
a192a958 LB |
46 | #define PREFIX "ACPI: " |
47 | ||
1c9ca3a7 | 48 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 49 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 50 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
51 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
52 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
53 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1c9ca3a7 BH |
54 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
55 | ||
4daeaf68 RW |
56 | static int acpi_pci_link_add(struct acpi_device *device, |
57 | const struct acpi_device_id *not_used); | |
58 | static void acpi_pci_link_remove(struct acpi_device *device); | |
1da177e4 | 59 | |
c97adf9e | 60 | static const struct acpi_device_id link_device_ids[] = { |
1ba90e3a TR |
61 | {"PNP0C0F", 0}, |
62 | {"", 0}, | |
63 | }; | |
1ba90e3a | 64 | |
4daeaf68 | 65 | static struct acpi_scan_handler pci_link_handler = { |
1ba90e3a | 66 | .ids = link_device_ids, |
4daeaf68 RW |
67 | .attach = acpi_pci_link_add, |
68 | .detach = acpi_pci_link_remove, | |
1da177e4 LT |
69 | }; |
70 | ||
87bec66b DSL |
71 | /* |
72 | * If a link is initialized, we never change its active and initialized | |
73 | * later even the link is disable. Instead, we just repick the active irq | |
74 | */ | |
1da177e4 | 75 | struct acpi_pci_link_irq { |
4be44fcd | 76 | u8 active; /* Current IRQ */ |
50eca3eb | 77 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 78 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
79 | u8 resource_type; |
80 | u8 possible_count; | |
81 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
82 | u8 initialized:1; | |
83 | u8 reserved:7; | |
1da177e4 LT |
84 | }; |
85 | ||
86 | struct acpi_pci_link { | |
5f0dccaa | 87 | struct list_head list; |
1c9ca3a7 BH |
88 | struct acpi_device *device; |
89 | struct acpi_pci_link_irq irq; | |
90 | int refcnt; | |
1da177e4 LT |
91 | }; |
92 | ||
5f0dccaa | 93 | static LIST_HEAD(acpi_link_list); |
e5685b9d | 94 | static DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 95 | |
1da177e4 LT |
96 | /* -------------------------------------------------------------------------- |
97 | PCI Link Device Management | |
98 | -------------------------------------------------------------------------- */ | |
99 | ||
100 | /* | |
101 | * set context (link) possible list from resource list | |
102 | */ | |
1c9ca3a7 BH |
103 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
104 | void *context) | |
1da177e4 | 105 | { |
50dd0969 | 106 | struct acpi_pci_link *link = context; |
c9d62443 | 107 | u32 i; |
1da177e4 | 108 | |
eca008c8 | 109 | switch (resource->type) { |
50eca3eb | 110 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 111 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 112 | return AE_OK; |
50eca3eb | 113 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
114 | { |
115 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 116 | if (!p || !p->interrupt_count) { |
4a5e3638 BH |
117 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
118 | "Blank _PRS IRQ resource\n")); | |
d550d98d | 119 | return AE_OK; |
1da177e4 | 120 | } |
4be44fcd | 121 | for (i = 0; |
50eca3eb | 122 | (i < p->interrupt_count |
4be44fcd LB |
123 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
124 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
125 | printk(KERN_WARNING PREFIX |
126 | "Invalid _PRS IRQ %d\n", | |
127 | p->interrupts[i]); | |
4be44fcd LB |
128 | continue; |
129 | } | |
130 | link->irq.possible[i] = p->interrupts[i]; | |
131 | link->irq.possible_count++; | |
132 | } | |
50eca3eb BM |
133 | link->irq.triggering = p->triggering; |
134 | link->irq.polarity = p->polarity; | |
135 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 136 | break; |
1da177e4 | 137 | } |
50eca3eb | 138 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 139 | { |
50eca3eb | 140 | struct acpi_resource_extended_irq *p = |
4be44fcd | 141 | &resource->data.extended_irq; |
50eca3eb | 142 | if (!p || !p->interrupt_count) { |
cece9296 | 143 | printk(KERN_WARNING PREFIX |
4a5e3638 | 144 | "Blank _PRS EXT IRQ resource\n"); |
d550d98d | 145 | return AE_OK; |
4be44fcd LB |
146 | } |
147 | for (i = 0; | |
50eca3eb | 148 | (i < p->interrupt_count |
4be44fcd LB |
149 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
150 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
151 | printk(KERN_WARNING PREFIX |
152 | "Invalid _PRS IRQ %d\n", | |
153 | p->interrupts[i]); | |
4be44fcd LB |
154 | continue; |
155 | } | |
156 | link->irq.possible[i] = p->interrupts[i]; | |
157 | link->irq.possible_count++; | |
1da177e4 | 158 | } |
50eca3eb BM |
159 | link->irq.triggering = p->triggering; |
160 | link->irq.polarity = p->polarity; | |
161 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 162 | break; |
1da177e4 | 163 | } |
1da177e4 | 164 | default: |
4a5e3638 BH |
165 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
166 | resource->type); | |
d550d98d | 167 | return AE_OK; |
1da177e4 LT |
168 | } |
169 | ||
d550d98d | 170 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
171 | } |
172 | ||
4be44fcd | 173 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 174 | { |
4be44fcd | 175 | acpi_status status; |
1da177e4 | 176 | |
67a71365 | 177 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 178 | acpi_pci_link_check_possible, link); |
1da177e4 | 179 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 180 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 181 | return -ENODEV; |
1da177e4 LT |
182 | } |
183 | ||
4be44fcd LB |
184 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
185 | "Found %d possible IRQs\n", | |
186 | link->irq.possible_count)); | |
1da177e4 | 187 | |
d550d98d | 188 | return 0; |
1da177e4 LT |
189 | } |
190 | ||
1c9ca3a7 BH |
191 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
192 | void *context) | |
1da177e4 | 193 | { |
c9d62443 | 194 | int *irq = context; |
1da177e4 | 195 | |
eca008c8 | 196 | switch (resource->type) { |
4a5e3638 BH |
197 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
198 | case ACPI_RESOURCE_TYPE_END_TAG: | |
199 | return AE_OK; | |
50eca3eb | 200 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
201 | { |
202 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 203 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
204 | /* |
205 | * IRQ descriptors may have no IRQ# bits set, | |
206 | * particularly those those w/ _STA disabled | |
207 | */ | |
208 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4a5e3638 | 209 | "Blank _CRS IRQ resource\n")); |
d550d98d | 210 | return AE_OK; |
4be44fcd LB |
211 | } |
212 | *irq = p->interrupts[0]; | |
213 | break; | |
1da177e4 | 214 | } |
50eca3eb | 215 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 216 | { |
50eca3eb | 217 | struct acpi_resource_extended_irq *p = |
4be44fcd | 218 | &resource->data.extended_irq; |
50eca3eb | 219 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
220 | /* |
221 | * extended IRQ descriptors must | |
222 | * return at least 1 IRQ | |
223 | */ | |
cece9296 | 224 | printk(KERN_WARNING PREFIX |
4a5e3638 | 225 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 226 | return AE_OK; |
4be44fcd LB |
227 | } |
228 | *irq = p->interrupts[0]; | |
229 | break; | |
1da177e4 | 230 | } |
d4ec6c7c | 231 | break; |
1da177e4 | 232 | default: |
4a5e3638 BH |
233 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
234 | resource->type); | |
d550d98d | 235 | return AE_OK; |
1da177e4 | 236 | } |
4a5e3638 | 237 | |
d550d98d | 238 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
239 | } |
240 | ||
241 | /* | |
242 | * Run _CRS and set link->irq.active | |
243 | * | |
244 | * return value: | |
245 | * 0 - success | |
246 | * !0 - failure | |
247 | */ | |
4be44fcd | 248 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 249 | { |
4be44fcd | 250 | int result = 0; |
c9d62443 | 251 | acpi_status status; |
4be44fcd | 252 | int irq = 0; |
1da177e4 | 253 | |
1da177e4 LT |
254 | link->irq.active = 0; |
255 | ||
256 | /* in practice, status disabled is meaningless, ignore it */ | |
257 | if (acpi_strict) { | |
258 | /* Query _STA, set link->device->status */ | |
259 | result = acpi_bus_get_status(link->device); | |
260 | if (result) { | |
6468463a | 261 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
262 | goto end; |
263 | } | |
264 | ||
265 | if (!link->device->status.enabled) { | |
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 267 | return 0; |
1da177e4 LT |
268 | } |
269 | } | |
270 | ||
271 | /* | |
272 | * Query and parse _CRS to get the current IRQ assignment. | |
273 | */ | |
274 | ||
67a71365 | 275 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 276 | acpi_pci_link_check_current, &irq); |
1da177e4 | 277 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 278 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
279 | result = -ENODEV; |
280 | goto end; | |
281 | } | |
282 | ||
283 | if (acpi_strict && !irq) { | |
6468463a | 284 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
285 | result = -ENODEV; |
286 | } | |
287 | ||
288 | link->irq.active = irq; | |
289 | ||
290 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
291 | ||
4be44fcd | 292 | end: |
d550d98d | 293 | return result; |
1da177e4 LT |
294 | } |
295 | ||
4be44fcd | 296 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 297 | { |
c9d62443 BH |
298 | int result; |
299 | acpi_status status; | |
1da177e4 | 300 | struct { |
4be44fcd LB |
301 | struct acpi_resource res; |
302 | struct acpi_resource end; | |
303 | } *resource; | |
304 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 305 | |
6eca4b4c | 306 | if (!irq) |
d550d98d | 307 | return -EINVAL; |
1da177e4 | 308 | |
36bcbec7 | 309 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 310 | if (!resource) |
d550d98d | 311 | return -ENOMEM; |
1da177e4 | 312 | |
4be44fcd | 313 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
314 | buffer.pointer = resource; |
315 | ||
4be44fcd | 316 | switch (link->irq.resource_type) { |
50eca3eb BM |
317 | case ACPI_RESOURCE_TYPE_IRQ: |
318 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 319 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
320 | resource->res.data.irq.triggering = link->irq.triggering; |
321 | resource->res.data.irq.polarity = | |
322 | link->irq.polarity; | |
323 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
324 | resource->res.data.irq.sharable = | |
4be44fcd | 325 | ACPI_EXCLUSIVE; |
1da177e4 | 326 | else |
50eca3eb BM |
327 | resource->res.data.irq.sharable = ACPI_SHARED; |
328 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
329 | resource->res.data.irq.interrupts[0] = irq; |
330 | break; | |
4be44fcd | 331 | |
50eca3eb BM |
332 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
333 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 334 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
335 | resource->res.data.extended_irq.producer_consumer = |
336 | ACPI_CONSUMER; | |
50eca3eb BM |
337 | resource->res.data.extended_irq.triggering = |
338 | link->irq.triggering; | |
339 | resource->res.data.extended_irq.polarity = | |
340 | link->irq.polarity; | |
341 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
342 | resource->res.data.irq.sharable = | |
4be44fcd | 343 | ACPI_EXCLUSIVE; |
1da177e4 | 344 | else |
50eca3eb BM |
345 | resource->res.data.irq.sharable = ACPI_SHARED; |
346 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
347 | resource->res.data.extended_irq.interrupts[0] = irq; |
348 | /* ignore resource_source, it's optional */ | |
349 | break; | |
350 | default: | |
6468463a | 351 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
352 | result = -EINVAL; |
353 | goto end; | |
354 | ||
355 | } | |
50eca3eb | 356 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
357 | |
358 | /* Attempt to set the resource */ | |
67a71365 | 359 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
360 | |
361 | /* check for total failure */ | |
362 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 363 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
364 | result = -ENODEV; |
365 | goto end; | |
366 | } | |
367 | ||
368 | /* Query _STA, set device->status */ | |
369 | result = acpi_bus_get_status(link->device); | |
370 | if (result) { | |
6468463a | 371 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
372 | goto end; |
373 | } | |
374 | if (!link->device->status.enabled) { | |
cece9296 LB |
375 | printk(KERN_WARNING PREFIX |
376 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 377 | acpi_device_name(link->device), |
cece9296 | 378 | acpi_device_bid(link->device)); |
1da177e4 LT |
379 | } |
380 | ||
381 | /* Query _CRS, set link->irq.active */ | |
382 | result = acpi_pci_link_get_current(link); | |
383 | if (result) { | |
384 | goto end; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Is current setting not what we set? | |
389 | * set link->irq.active | |
390 | */ | |
391 | if (link->irq.active != irq) { | |
392 | /* | |
393 | * policy: when _CRS doesn't return what we just _SRS | |
394 | * assume _SRS worked and override _CRS value. | |
395 | */ | |
cece9296 LB |
396 | printk(KERN_WARNING PREFIX |
397 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 398 | acpi_device_name(link->device), |
cece9296 | 399 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
400 | link->irq.active = irq; |
401 | } | |
402 | ||
403 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
404 | |
405 | end: | |
1da177e4 | 406 | kfree(resource); |
d550d98d | 407 | return result; |
1da177e4 LT |
408 | } |
409 | ||
1da177e4 LT |
410 | /* -------------------------------------------------------------------------- |
411 | PCI Link IRQ Management | |
412 | -------------------------------------------------------------------------- */ | |
413 | ||
414 | /* | |
415 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
416 | * Link Devices to move the PIRQs around to minimize sharing. | |
417 | * | |
418 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
419 | * that the BIOS has already set to active. This is necessary because | |
420 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
421 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
422 | * even if acpi_irq_nobalance is set. | |
423 | * | |
424 | * A tables of penalties avoids directing PCI interrupts to well known | |
425 | * ISA IRQs. Boot params are available to over-ride the default table: | |
426 | * | |
427 | * List interrupts that are free for PCI use. | |
428 | * acpi_irq_pci=n[,m] | |
429 | * | |
430 | * List interrupts that should not be used for PCI: | |
431 | * acpi_irq_isa=n[,m] | |
432 | * | |
433 | * Note that PCI IRQ routers have a list of possible IRQs, | |
434 | * which may not include the IRQs this table says are available. | |
435 | * | |
436 | * Since this heuristic can't tell the difference between a link | |
437 | * that no device will attach to, vs. a link which may be shared | |
438 | * by multiple active devices -- it is not optimal. | |
439 | * | |
440 | * If interrupt performance is that important, get an IO-APIC system | |
441 | * with a pin dedicated to each device. Or for that matter, an MSI | |
442 | * enabled system. | |
443 | */ | |
444 | ||
445 | #define ACPI_MAX_IRQS 256 | |
446 | #define ACPI_MAX_ISA_IRQ 16 | |
447 | ||
448 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
449 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
450 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
451 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
452 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
453 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
454 | ||
455 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
456 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
457 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
458 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
459 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
460 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
461 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
462 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
463 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
464 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
465 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
466 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
467 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
468 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
469 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
470 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
471 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 472 | /* >IRQ15 */ |
1da177e4 LT |
473 | }; |
474 | ||
4be44fcd | 475 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 476 | { |
c9d62443 BH |
477 | struct acpi_pci_link *link; |
478 | int i; | |
1da177e4 | 479 | |
1da177e4 LT |
480 | /* |
481 | * Update penalties to facilitate IRQ balancing. | |
482 | */ | |
5f0dccaa | 483 | list_for_each_entry(link, &acpi_link_list, list) { |
1da177e4 LT |
484 | |
485 | /* | |
486 | * reflect the possible and active irqs in the penalty table -- | |
487 | * useful for breaking ties. | |
488 | */ | |
489 | if (link->irq.possible_count) { | |
4be44fcd LB |
490 | int penalty = |
491 | PIRQ_PENALTY_PCI_POSSIBLE / | |
492 | link->irq.possible_count; | |
1da177e4 LT |
493 | |
494 | for (i = 0; i < link->irq.possible_count; i++) { | |
495 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
496 | acpi_irq_penalty[link->irq. |
497 | possible[i]] += | |
498 | penalty; | |
1da177e4 LT |
499 | } |
500 | ||
501 | } else if (link->irq.active) { | |
4be44fcd LB |
502 | acpi_irq_penalty[link->irq.active] += |
503 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
504 | } |
505 | } | |
506 | /* Add a penalty for the SCI */ | |
cee324b1 | 507 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
d550d98d | 508 | return 0; |
1da177e4 LT |
509 | } |
510 | ||
32836259 | 511 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 512 | |
4be44fcd | 513 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 514 | { |
4be44fcd LB |
515 | int irq; |
516 | int i; | |
1da177e4 | 517 | |
87bec66b DSL |
518 | if (link->irq.initialized) { |
519 | if (link->refcnt == 0) | |
520 | /* This means the link is disabled but initialized */ | |
521 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 522 | return 0; |
87bec66b | 523 | } |
1da177e4 LT |
524 | |
525 | /* | |
526 | * search for active IRQ in list of possible IRQs. | |
527 | */ | |
528 | for (i = 0; i < link->irq.possible_count; ++i) { | |
529 | if (link->irq.active == link->irq.possible[i]) | |
530 | break; | |
531 | } | |
532 | /* | |
533 | * forget active IRQ that is not in possible list | |
534 | */ | |
535 | if (i == link->irq.possible_count) { | |
536 | if (acpi_strict) | |
cece9296 LB |
537 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
538 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
539 | link->irq.active = 0; |
540 | } | |
541 | ||
542 | /* | |
543 | * if active found, use it; else pick entry from end of possible list. | |
544 | */ | |
1c9ca3a7 | 545 | if (link->irq.active) |
1da177e4 | 546 | irq = link->irq.active; |
1c9ca3a7 | 547 | else |
1da177e4 | 548 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
549 | |
550 | if (acpi_irq_balance || !link->irq.active) { | |
551 | /* | |
552 | * Select the best IRQ. This is done in reverse to promote | |
553 | * the use of IRQs 9, 10, 11, and >15. | |
554 | */ | |
555 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
556 | if (acpi_irq_penalty[irq] > |
557 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
558 | irq = link->irq.possible[i]; |
559 | } | |
560 | } | |
561 | ||
562 | /* Attempt to enable the link device at this IRQ. */ | |
563 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
564 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
565 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 566 | acpi_device_name(link->device), |
6468463a | 567 | acpi_device_bid(link->device)); |
d550d98d | 568 | return -ENODEV; |
1da177e4 LT |
569 | } else { |
570 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4d939155 | 571 | printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
572 | acpi_device_name(link->device), |
573 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
574 | } |
575 | ||
576 | link->irq.initialized = 1; | |
d550d98d | 577 | return 0; |
1da177e4 LT |
578 | } |
579 | ||
580 | /* | |
87bec66b | 581 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
582 | * success: return IRQ >= 0 |
583 | * failure: return -1 | |
584 | */ | |
1c9ca3a7 BH |
585 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
586 | int *polarity, char **name) | |
1da177e4 | 587 | { |
c9d62443 BH |
588 | int result; |
589 | struct acpi_device *device; | |
590 | struct acpi_pci_link *link; | |
1da177e4 | 591 | |
1da177e4 LT |
592 | result = acpi_bus_get_device(handle, &device); |
593 | if (result) { | |
6468463a | 594 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 595 | return -1; |
1da177e4 LT |
596 | } |
597 | ||
50dd0969 | 598 | link = acpi_driver_data(device); |
1da177e4 | 599 | if (!link) { |
6468463a | 600 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 601 | return -1; |
1da177e4 LT |
602 | } |
603 | ||
604 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
605 | if (index) { | |
6468463a | 606 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 607 | return -1; |
1da177e4 LT |
608 | } |
609 | ||
36e43095 | 610 | mutex_lock(&acpi_link_lock); |
87bec66b | 611 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 612 | mutex_unlock(&acpi_link_lock); |
d550d98d | 613 | return -1; |
87bec66b | 614 | } |
4be44fcd | 615 | |
1da177e4 | 616 | if (!link->irq.active) { |
36e43095 | 617 | mutex_unlock(&acpi_link_lock); |
6468463a | 618 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 619 | return -1; |
1da177e4 | 620 | } |
4be44fcd | 621 | link->refcnt++; |
36e43095 | 622 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 623 | |
50eca3eb BM |
624 | if (triggering) |
625 | *triggering = link->irq.triggering; | |
626 | if (polarity) | |
627 | *polarity = link->irq.polarity; | |
4be44fcd LB |
628 | if (name) |
629 | *name = acpi_device_bid(link->device); | |
87bec66b | 630 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
631 | "Link %s is referenced\n", |
632 | acpi_device_bid(link->device))); | |
d550d98d | 633 | return (link->irq.active); |
1da177e4 LT |
634 | } |
635 | ||
87bec66b DSL |
636 | /* |
637 | * We don't change link's irq information here. After it is reenabled, we | |
638 | * continue use the info | |
639 | */ | |
4be44fcd | 640 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 641 | { |
c9d62443 BH |
642 | struct acpi_device *device; |
643 | struct acpi_pci_link *link; | |
4be44fcd | 644 | acpi_status result; |
87bec66b | 645 | |
87bec66b DSL |
646 | result = acpi_bus_get_device(handle, &device); |
647 | if (result) { | |
6468463a | 648 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 649 | return -1; |
87bec66b | 650 | } |
1da177e4 | 651 | |
50dd0969 | 652 | link = acpi_driver_data(device); |
87bec66b | 653 | if (!link) { |
6468463a | 654 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 655 | return -1; |
87bec66b DSL |
656 | } |
657 | ||
36e43095 | 658 | mutex_lock(&acpi_link_lock); |
87bec66b | 659 | if (!link->irq.initialized) { |
36e43095 | 660 | mutex_unlock(&acpi_link_lock); |
6468463a | 661 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 662 | return -1; |
87bec66b | 663 | } |
ecc21ebe DSL |
664 | #ifdef FUTURE_USE |
665 | /* | |
666 | * The Link reference count allows us to _DISable an unused link | |
667 | * and suspend time, and set it again on resume. | |
668 | * However, 2.6.12 still has irq_router.resume | |
669 | * which blindly restores the link state. | |
670 | * So we disable the reference count method | |
671 | * to prevent duplicate acpi_pci_link_set() | |
672 | * which would harm some systems | |
673 | */ | |
4be44fcd | 674 | link->refcnt--; |
ecc21ebe | 675 | #endif |
87bec66b | 676 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
677 | "Link %s is dereferenced\n", |
678 | acpi_device_bid(link->device))); | |
87bec66b | 679 | |
1c9ca3a7 | 680 | if (link->refcnt == 0) |
383d7a11 | 681 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 682 | |
36e43095 | 683 | mutex_unlock(&acpi_link_lock); |
d550d98d | 684 | return (link->irq.active); |
87bec66b | 685 | } |
4be44fcd | 686 | |
1da177e4 LT |
687 | /* -------------------------------------------------------------------------- |
688 | Driver Interface | |
689 | -------------------------------------------------------------------------- */ | |
690 | ||
4daeaf68 RW |
691 | static int acpi_pci_link_add(struct acpi_device *device, |
692 | const struct acpi_device_id *not_used) | |
1da177e4 | 693 | { |
c9d62443 BH |
694 | int result; |
695 | struct acpi_pci_link *link; | |
696 | int i; | |
4be44fcd | 697 | int found = 0; |
1da177e4 | 698 | |
36bcbec7 | 699 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 700 | if (!link) |
d550d98d | 701 | return -ENOMEM; |
1da177e4 LT |
702 | |
703 | link->device = device; | |
1da177e4 LT |
704 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
705 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 706 | device->driver_data = link; |
1da177e4 | 707 | |
36e43095 | 708 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
709 | result = acpi_pci_link_get_possible(link); |
710 | if (result) | |
711 | goto end; | |
712 | ||
713 | /* query and set link->irq.active */ | |
714 | acpi_pci_link_get_current(link); | |
715 | ||
0dc070bb | 716 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 717 | acpi_device_bid(device)); |
1da177e4 LT |
718 | for (i = 0; i < link->irq.possible_count; i++) { |
719 | if (link->irq.active == link->irq.possible[i]) { | |
be96447e | 720 | printk(KERN_CONT " *%d", link->irq.possible[i]); |
1da177e4 | 721 | found = 1; |
4be44fcd | 722 | } else |
be96447e | 723 | printk(KERN_CONT " %d", link->irq.possible[i]); |
1da177e4 LT |
724 | } |
725 | ||
be96447e | 726 | printk(KERN_CONT ")"); |
1da177e4 LT |
727 | |
728 | if (!found) | |
be96447e | 729 | printk(KERN_CONT " *%d", link->irq.active); |
1da177e4 | 730 | |
4be44fcd | 731 | if (!link->device->status.enabled) |
be96447e | 732 | printk(KERN_CONT ", disabled."); |
1da177e4 | 733 | |
be96447e | 734 | printk(KERN_CONT "\n"); |
1da177e4 | 735 | |
5f0dccaa | 736 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 737 | |
4be44fcd | 738 | end: |
1da177e4 | 739 | /* disable all links -- to be activated on use */ |
383d7a11 | 740 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 741 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
742 | |
743 | if (result) | |
744 | kfree(link); | |
745 | ||
4daeaf68 | 746 | return result < 0 ? result : 1; |
1da177e4 LT |
747 | } |
748 | ||
4be44fcd | 749 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 750 | { |
697a2d63 | 751 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 752 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
753 | |
754 | return 0; | |
697a2d63 LT |
755 | } |
756 | ||
c3146df2 | 757 | static void irqrouter_resume(void) |
1da177e4 | 758 | { |
c9d62443 | 759 | struct acpi_pci_link *link; |
1da177e4 | 760 | |
5f0dccaa | 761 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 762 | acpi_pci_link_resume(link); |
1da177e4 | 763 | } |
1da177e4 LT |
764 | } |
765 | ||
4daeaf68 | 766 | static void acpi_pci_link_remove(struct acpi_device *device) |
1da177e4 | 767 | { |
c9d62443 | 768 | struct acpi_pci_link *link; |
1da177e4 | 769 | |
50dd0969 | 770 | link = acpi_driver_data(device); |
1da177e4 | 771 | |
36e43095 | 772 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 773 | list_del(&link->list); |
36e43095 | 774 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
775 | |
776 | kfree(link); | |
1da177e4 LT |
777 | } |
778 | ||
779 | /* | |
780 | * modify acpi_irq_penalty[] from cmdline | |
781 | */ | |
782 | static int __init acpi_irq_penalty_update(char *str, int used) | |
783 | { | |
784 | int i; | |
785 | ||
786 | for (i = 0; i < 16; i++) { | |
787 | int retval; | |
788 | int irq; | |
789 | ||
4be44fcd | 790 | retval = get_option(&str, &irq); |
1da177e4 LT |
791 | |
792 | if (!retval) | |
793 | break; /* no number found */ | |
794 | ||
795 | if (irq < 0) | |
796 | continue; | |
4be44fcd | 797 | |
fa46d352 | 798 | if (irq >= ARRAY_SIZE(acpi_irq_penalty)) |
1da177e4 LT |
799 | continue; |
800 | ||
801 | if (used) | |
802 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
803 | else | |
804 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
805 | ||
806 | if (retval != 2) /* no next number */ | |
807 | break; | |
808 | } | |
809 | return 1; | |
810 | } | |
811 | ||
812 | /* | |
813 | * We'd like PNP to call this routine for the | |
814 | * single ISA_USED value for each legacy device. | |
815 | * But instead it calls us with each POSSIBLE setting. | |
816 | * There is no ISA_POSSIBLE weight, so we simply use | |
817 | * the (small) PCI_USING penalty. | |
818 | */ | |
c9c3e457 | 819 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 820 | { |
fa46d352 BH |
821 | if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) { |
822 | if (active) | |
823 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
824 | else | |
825 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
826 | } | |
1da177e4 LT |
827 | } |
828 | ||
829 | /* | |
830 | * Over-ride default table to reserve additional IRQs for use by ISA | |
831 | * e.g. acpi_irq_isa=5 | |
832 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
833 | */ | |
834 | static int __init acpi_irq_isa(char *str) | |
835 | { | |
836 | return acpi_irq_penalty_update(str, 1); | |
837 | } | |
4be44fcd | 838 | |
1da177e4 LT |
839 | __setup("acpi_irq_isa=", acpi_irq_isa); |
840 | ||
841 | /* | |
842 | * Over-ride default table to free additional IRQs for use by PCI | |
843 | * e.g. acpi_irq_pci=7,15 | |
844 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
845 | */ | |
846 | static int __init acpi_irq_pci(char *str) | |
847 | { | |
848 | return acpi_irq_penalty_update(str, 0); | |
849 | } | |
4be44fcd | 850 | |
1da177e4 LT |
851 | __setup("acpi_irq_pci=", acpi_irq_pci); |
852 | ||
853 | static int __init acpi_irq_nobalance_set(char *str) | |
854 | { | |
855 | acpi_irq_balance = 0; | |
856 | return 1; | |
857 | } | |
4be44fcd | 858 | |
1da177e4 LT |
859 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
860 | ||
8a383ef0 | 861 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
862 | { |
863 | acpi_irq_balance = 1; | |
864 | return 1; | |
865 | } | |
1da177e4 | 866 | |
4be44fcd | 867 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 868 | |
c3146df2 | 869 | static struct syscore_ops irqrouter_syscore_ops = { |
4be44fcd | 870 | .resume = irqrouter_resume, |
1da177e4 LT |
871 | }; |
872 | ||
4daeaf68 | 873 | void __init acpi_pci_link_init(void) |
1da177e4 | 874 | { |
1da177e4 | 875 | if (acpi_noirq) |
4daeaf68 | 876 | return; |
1da177e4 | 877 | |
32836259 BH |
878 | if (acpi_irq_balance == -1) { |
879 | /* no command line switch: enable balancing in IOAPIC mode */ | |
880 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
881 | acpi_irq_balance = 1; | |
882 | else | |
883 | acpi_irq_balance = 0; | |
884 | } | |
4daeaf68 RW |
885 | register_syscore_ops(&irqrouter_syscore_ops); |
886 | acpi_scan_add_handler(&pci_link_handler); | |
1da177e4 | 887 | } |