Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $) | |
4 | * | |
5 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
6 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> | |
8 | * | |
1da177e4 LT |
9 | * TBD: |
10 | * 1. Support more than one IRQ resource entry per link device (index). | |
11 | * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities | |
12 | * for IRQ management (e.g. start()->_SRS). | |
13 | */ | |
14 | ||
c3146df2 | 15 | #include <linux/syscore_ops.h> |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/types.h> | |
1da177e4 LT |
20 | #include <linux/spinlock.h> |
21 | #include <linux/pm.h> | |
22 | #include <linux/pci.h> | |
36e43095 | 23 | #include <linux/mutex.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
8b48463f | 25 | #include <linux/acpi.h> |
103544d8 | 26 | #include <linux/irq.h> |
1da177e4 | 27 | |
c071b604 R |
28 | #include "internal.h" |
29 | ||
1c9ca3a7 | 30 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 31 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 32 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
33 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
34 | #define ACPI_PCI_LINK_FILE_INFO "info" | |
35 | #define ACPI_PCI_LINK_FILE_STATUS "state" | |
1c9ca3a7 BH |
36 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
37 | ||
4daeaf68 RW |
38 | static int acpi_pci_link_add(struct acpi_device *device, |
39 | const struct acpi_device_id *not_used); | |
40 | static void acpi_pci_link_remove(struct acpi_device *device); | |
1da177e4 | 41 | |
c97adf9e | 42 | static const struct acpi_device_id link_device_ids[] = { |
1ba90e3a TR |
43 | {"PNP0C0F", 0}, |
44 | {"", 0}, | |
45 | }; | |
1ba90e3a | 46 | |
4daeaf68 | 47 | static struct acpi_scan_handler pci_link_handler = { |
1ba90e3a | 48 | .ids = link_device_ids, |
4daeaf68 RW |
49 | .attach = acpi_pci_link_add, |
50 | .detach = acpi_pci_link_remove, | |
1da177e4 LT |
51 | }; |
52 | ||
87bec66b DSL |
53 | /* |
54 | * If a link is initialized, we never change its active and initialized | |
55 | * later even the link is disable. Instead, we just repick the active irq | |
56 | */ | |
1da177e4 | 57 | struct acpi_pci_link_irq { |
37c59391 | 58 | u32 active; /* Current IRQ */ |
50eca3eb | 59 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 60 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
61 | u8 resource_type; |
62 | u8 possible_count; | |
37c59391 | 63 | u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; |
4be44fcd LB |
64 | u8 initialized:1; |
65 | u8 reserved:7; | |
1da177e4 LT |
66 | }; |
67 | ||
68 | struct acpi_pci_link { | |
5f0dccaa | 69 | struct list_head list; |
1c9ca3a7 BH |
70 | struct acpi_device *device; |
71 | struct acpi_pci_link_irq irq; | |
72 | int refcnt; | |
1da177e4 LT |
73 | }; |
74 | ||
5f0dccaa | 75 | static LIST_HEAD(acpi_link_list); |
e5685b9d | 76 | static DEFINE_MUTEX(acpi_link_lock); |
f1caa61d | 77 | static int sci_irq = -1, sci_penalty; |
1da177e4 | 78 | |
1da177e4 LT |
79 | /* -------------------------------------------------------------------------- |
80 | PCI Link Device Management | |
81 | -------------------------------------------------------------------------- */ | |
82 | ||
83 | /* | |
84 | * set context (link) possible list from resource list | |
85 | */ | |
1c9ca3a7 BH |
86 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
87 | void *context) | |
1da177e4 | 88 | { |
50dd0969 | 89 | struct acpi_pci_link *link = context; |
c9d62443 | 90 | u32 i; |
1da177e4 | 91 | |
eca008c8 | 92 | switch (resource->type) { |
50eca3eb | 93 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 94 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 95 | return AE_OK; |
50eca3eb | 96 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
97 | { |
98 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 99 | if (!p || !p->interrupt_count) { |
4a5e3638 BH |
100 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
101 | "Blank _PRS IRQ resource\n")); | |
d550d98d | 102 | return AE_OK; |
1da177e4 | 103 | } |
4be44fcd | 104 | for (i = 0; |
50eca3eb | 105 | (i < p->interrupt_count |
4be44fcd LB |
106 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
107 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
108 | printk(KERN_WARNING PREFIX |
109 | "Invalid _PRS IRQ %d\n", | |
110 | p->interrupts[i]); | |
4be44fcd LB |
111 | continue; |
112 | } | |
113 | link->irq.possible[i] = p->interrupts[i]; | |
114 | link->irq.possible_count++; | |
115 | } | |
50eca3eb BM |
116 | link->irq.triggering = p->triggering; |
117 | link->irq.polarity = p->polarity; | |
118 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 119 | break; |
1da177e4 | 120 | } |
50eca3eb | 121 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 122 | { |
50eca3eb | 123 | struct acpi_resource_extended_irq *p = |
4be44fcd | 124 | &resource->data.extended_irq; |
50eca3eb | 125 | if (!p || !p->interrupt_count) { |
cece9296 | 126 | printk(KERN_WARNING PREFIX |
4a5e3638 | 127 | "Blank _PRS EXT IRQ resource\n"); |
d550d98d | 128 | return AE_OK; |
4be44fcd LB |
129 | } |
130 | for (i = 0; | |
50eca3eb | 131 | (i < p->interrupt_count |
4be44fcd LB |
132 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
133 | if (!p->interrupts[i]) { | |
4a5e3638 BH |
134 | printk(KERN_WARNING PREFIX |
135 | "Invalid _PRS IRQ %d\n", | |
136 | p->interrupts[i]); | |
4be44fcd LB |
137 | continue; |
138 | } | |
139 | link->irq.possible[i] = p->interrupts[i]; | |
140 | link->irq.possible_count++; | |
1da177e4 | 141 | } |
50eca3eb BM |
142 | link->irq.triggering = p->triggering; |
143 | link->irq.polarity = p->polarity; | |
144 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 145 | break; |
1da177e4 | 146 | } |
1da177e4 | 147 | default: |
4a5e3638 BH |
148 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
149 | resource->type); | |
d550d98d | 150 | return AE_OK; |
1da177e4 LT |
151 | } |
152 | ||
d550d98d | 153 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
154 | } |
155 | ||
4be44fcd | 156 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 157 | { |
4be44fcd | 158 | acpi_status status; |
1da177e4 | 159 | |
67a71365 | 160 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 161 | acpi_pci_link_check_possible, link); |
1da177e4 | 162 | if (ACPI_FAILURE(status)) { |
92d1b381 AH |
163 | acpi_handle_debug(link->device->handle, "_PRS not present or invalid"); |
164 | return 0; | |
1da177e4 LT |
165 | } |
166 | ||
4be44fcd LB |
167 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
168 | "Found %d possible IRQs\n", | |
169 | link->irq.possible_count)); | |
1da177e4 | 170 | |
d550d98d | 171 | return 0; |
1da177e4 LT |
172 | } |
173 | ||
1c9ca3a7 BH |
174 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
175 | void *context) | |
1da177e4 | 176 | { |
c9d62443 | 177 | int *irq = context; |
1da177e4 | 178 | |
eca008c8 | 179 | switch (resource->type) { |
4a5e3638 BH |
180 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
181 | case ACPI_RESOURCE_TYPE_END_TAG: | |
182 | return AE_OK; | |
50eca3eb | 183 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
184 | { |
185 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 186 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
187 | /* |
188 | * IRQ descriptors may have no IRQ# bits set, | |
189 | * particularly those those w/ _STA disabled | |
190 | */ | |
191 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4a5e3638 | 192 | "Blank _CRS IRQ resource\n")); |
d550d98d | 193 | return AE_OK; |
4be44fcd LB |
194 | } |
195 | *irq = p->interrupts[0]; | |
196 | break; | |
1da177e4 | 197 | } |
50eca3eb | 198 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 199 | { |
50eca3eb | 200 | struct acpi_resource_extended_irq *p = |
4be44fcd | 201 | &resource->data.extended_irq; |
50eca3eb | 202 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
203 | /* |
204 | * extended IRQ descriptors must | |
205 | * return at least 1 IRQ | |
206 | */ | |
cece9296 | 207 | printk(KERN_WARNING PREFIX |
4a5e3638 | 208 | "Blank _CRS EXT IRQ resource\n"); |
d550d98d | 209 | return AE_OK; |
4be44fcd LB |
210 | } |
211 | *irq = p->interrupts[0]; | |
212 | break; | |
1da177e4 | 213 | } |
d4ec6c7c | 214 | break; |
1da177e4 | 215 | default: |
4a5e3638 BH |
216 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
217 | resource->type); | |
d550d98d | 218 | return AE_OK; |
1da177e4 | 219 | } |
4a5e3638 | 220 | |
d550d98d | 221 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
222 | } |
223 | ||
224 | /* | |
225 | * Run _CRS and set link->irq.active | |
226 | * | |
227 | * return value: | |
228 | * 0 - success | |
229 | * !0 - failure | |
230 | */ | |
4be44fcd | 231 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 232 | { |
4be44fcd | 233 | int result = 0; |
c9d62443 | 234 | acpi_status status; |
4be44fcd | 235 | int irq = 0; |
1da177e4 | 236 | |
1da177e4 LT |
237 | link->irq.active = 0; |
238 | ||
239 | /* in practice, status disabled is meaningless, ignore it */ | |
240 | if (acpi_strict) { | |
241 | /* Query _STA, set link->device->status */ | |
242 | result = acpi_bus_get_status(link->device); | |
243 | if (result) { | |
6468463a | 244 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
245 | goto end; |
246 | } | |
247 | ||
248 | if (!link->device->status.enabled) { | |
249 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 250 | return 0; |
1da177e4 LT |
251 | } |
252 | } | |
253 | ||
254 | /* | |
255 | * Query and parse _CRS to get the current IRQ assignment. | |
256 | */ | |
257 | ||
67a71365 | 258 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 259 | acpi_pci_link_check_current, &irq); |
1da177e4 | 260 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 261 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
262 | result = -ENODEV; |
263 | goto end; | |
264 | } | |
265 | ||
266 | if (acpi_strict && !irq) { | |
6468463a | 267 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
268 | result = -ENODEV; |
269 | } | |
270 | ||
271 | link->irq.active = irq; | |
272 | ||
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
274 | ||
4be44fcd | 275 | end: |
d550d98d | 276 | return result; |
1da177e4 LT |
277 | } |
278 | ||
4be44fcd | 279 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 280 | { |
c9d62443 BH |
281 | int result; |
282 | acpi_status status; | |
1da177e4 | 283 | struct { |
4be44fcd LB |
284 | struct acpi_resource res; |
285 | struct acpi_resource end; | |
286 | } *resource; | |
287 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 288 | |
6eca4b4c | 289 | if (!irq) |
d550d98d | 290 | return -EINVAL; |
1da177e4 | 291 | |
36bcbec7 | 292 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 293 | if (!resource) |
d550d98d | 294 | return -ENOMEM; |
1da177e4 | 295 | |
4be44fcd | 296 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
297 | buffer.pointer = resource; |
298 | ||
4be44fcd | 299 | switch (link->irq.resource_type) { |
50eca3eb BM |
300 | case ACPI_RESOURCE_TYPE_IRQ: |
301 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 302 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
303 | resource->res.data.irq.triggering = link->irq.triggering; |
304 | resource->res.data.irq.polarity = | |
305 | link->irq.polarity; | |
306 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
c163f90c | 307 | resource->res.data.irq.shareable = |
4be44fcd | 308 | ACPI_EXCLUSIVE; |
1da177e4 | 309 | else |
c163f90c | 310 | resource->res.data.irq.shareable = ACPI_SHARED; |
50eca3eb | 311 | resource->res.data.irq.interrupt_count = 1; |
1da177e4 LT |
312 | resource->res.data.irq.interrupts[0] = irq; |
313 | break; | |
4be44fcd | 314 | |
50eca3eb BM |
315 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
316 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 317 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
318 | resource->res.data.extended_irq.producer_consumer = |
319 | ACPI_CONSUMER; | |
50eca3eb BM |
320 | resource->res.data.extended_irq.triggering = |
321 | link->irq.triggering; | |
322 | resource->res.data.extended_irq.polarity = | |
323 | link->irq.polarity; | |
324 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
c163f90c | 325 | resource->res.data.irq.shareable = |
4be44fcd | 326 | ACPI_EXCLUSIVE; |
1da177e4 | 327 | else |
c163f90c | 328 | resource->res.data.irq.shareable = ACPI_SHARED; |
50eca3eb | 329 | resource->res.data.extended_irq.interrupt_count = 1; |
1da177e4 LT |
330 | resource->res.data.extended_irq.interrupts[0] = irq; |
331 | /* ignore resource_source, it's optional */ | |
332 | break; | |
333 | default: | |
6468463a | 334 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
335 | result = -EINVAL; |
336 | goto end; | |
337 | ||
338 | } | |
50eca3eb | 339 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
f084dbb9 | 340 | resource->end.length = sizeof(struct acpi_resource); |
1da177e4 LT |
341 | |
342 | /* Attempt to set the resource */ | |
67a71365 | 343 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
344 | |
345 | /* check for total failure */ | |
346 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 347 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
348 | result = -ENODEV; |
349 | goto end; | |
350 | } | |
351 | ||
352 | /* Query _STA, set device->status */ | |
353 | result = acpi_bus_get_status(link->device); | |
354 | if (result) { | |
6468463a | 355 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
356 | goto end; |
357 | } | |
358 | if (!link->device->status.enabled) { | |
cece9296 LB |
359 | printk(KERN_WARNING PREFIX |
360 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 361 | acpi_device_name(link->device), |
cece9296 | 362 | acpi_device_bid(link->device)); |
1da177e4 LT |
363 | } |
364 | ||
365 | /* Query _CRS, set link->irq.active */ | |
366 | result = acpi_pci_link_get_current(link); | |
367 | if (result) { | |
368 | goto end; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Is current setting not what we set? | |
373 | * set link->irq.active | |
374 | */ | |
375 | if (link->irq.active != irq) { | |
376 | /* | |
377 | * policy: when _CRS doesn't return what we just _SRS | |
378 | * assume _SRS worked and override _CRS value. | |
379 | */ | |
cece9296 LB |
380 | printk(KERN_WARNING PREFIX |
381 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 382 | acpi_device_name(link->device), |
cece9296 | 383 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
384 | link->irq.active = irq; |
385 | } | |
386 | ||
387 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
388 | |
389 | end: | |
1da177e4 | 390 | kfree(resource); |
d550d98d | 391 | return result; |
1da177e4 LT |
392 | } |
393 | ||
1da177e4 LT |
394 | /* -------------------------------------------------------------------------- |
395 | PCI Link IRQ Management | |
396 | -------------------------------------------------------------------------- */ | |
397 | ||
398 | /* | |
399 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
400 | * Link Devices to move the PIRQs around to minimize sharing. | |
401 | * | |
402 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
403 | * that the BIOS has already set to active. This is necessary because | |
404 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
405 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
406 | * even if acpi_irq_nobalance is set. | |
407 | * | |
408 | * A tables of penalties avoids directing PCI interrupts to well known | |
409 | * ISA IRQs. Boot params are available to over-ride the default table: | |
410 | * | |
411 | * List interrupts that are free for PCI use. | |
412 | * acpi_irq_pci=n[,m] | |
413 | * | |
414 | * List interrupts that should not be used for PCI: | |
415 | * acpi_irq_isa=n[,m] | |
416 | * | |
417 | * Note that PCI IRQ routers have a list of possible IRQs, | |
418 | * which may not include the IRQs this table says are available. | |
419 | * | |
420 | * Since this heuristic can't tell the difference between a link | |
421 | * that no device will attach to, vs. a link which may be shared | |
422 | * by multiple active devices -- it is not optimal. | |
423 | * | |
424 | * If interrupt performance is that important, get an IO-APIC system | |
425 | * with a pin dedicated to each device. Or for that matter, an MSI | |
426 | * enabled system. | |
427 | */ | |
428 | ||
5c5087a5 | 429 | #define ACPI_MAX_ISA_IRQS 16 |
1da177e4 | 430 | |
1da177e4 LT |
431 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) |
432 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
433 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
434 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
435 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
436 | ||
5c5087a5 | 437 | static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = { |
1da177e4 LT |
438 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ |
439 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
440 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
441 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
442 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
443 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
444 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
445 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
446 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
103544d8 SK |
447 | 0, /* IRQ9 PCI, often acpi */ |
448 | 0, /* IRQ10 PCI */ | |
449 | 0, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
450 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
451 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
452 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
453 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
e2497145 | 454 | /* >IRQ15 */ |
1da177e4 LT |
455 | }; |
456 | ||
103544d8 SK |
457 | static int acpi_irq_pci_sharing_penalty(int irq) |
458 | { | |
459 | struct acpi_pci_link *link; | |
460 | int penalty = 0; | |
4a6e68bf | 461 | int i; |
103544d8 SK |
462 | |
463 | list_for_each_entry(link, &acpi_link_list, list) { | |
464 | /* | |
465 | * If a link is active, penalize its IRQ heavily | |
466 | * so we try to choose a different IRQ. | |
467 | */ | |
468 | if (link->irq.active && link->irq.active == irq) | |
469 | penalty += PIRQ_PENALTY_PCI_USING; | |
4a6e68bf SK |
470 | |
471 | /* | |
472 | * penalize the IRQs PCI might use, but not as severely. | |
473 | */ | |
474 | for (i = 0; i < link->irq.possible_count; i++) | |
475 | if (link->irq.possible[i] == irq) | |
476 | penalty += PIRQ_PENALTY_PCI_POSSIBLE / | |
477 | link->irq.possible_count; | |
103544d8 SK |
478 | } |
479 | ||
480 | return penalty; | |
481 | } | |
482 | ||
483 | static int acpi_irq_get_penalty(int irq) | |
484 | { | |
485 | int penalty = 0; | |
486 | ||
f1caa61d SK |
487 | if (irq == sci_irq) |
488 | penalty += sci_penalty; | |
103544d8 | 489 | |
f7eca374 SK |
490 | if (irq < ACPI_MAX_ISA_IRQS) |
491 | return penalty + acpi_isa_irq_penalty[irq]; | |
492 | ||
f1caa61d | 493 | return penalty + acpi_irq_pci_sharing_penalty(irq); |
103544d8 SK |
494 | } |
495 | ||
487cf917 SK |
496 | int __init acpi_irq_penalty_init(void) |
497 | { | |
498 | struct acpi_pci_link *link; | |
499 | int i; | |
500 | ||
501 | /* | |
502 | * Update penalties to facilitate IRQ balancing. | |
503 | */ | |
504 | list_for_each_entry(link, &acpi_link_list, list) { | |
505 | ||
506 | /* | |
507 | * reflect the possible and active irqs in the penalty table -- | |
508 | * useful for breaking ties. | |
509 | */ | |
510 | if (link->irq.possible_count) { | |
511 | int penalty = | |
512 | PIRQ_PENALTY_PCI_POSSIBLE / | |
513 | link->irq.possible_count; | |
514 | ||
515 | for (i = 0; i < link->irq.possible_count; i++) { | |
516 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS) | |
517 | acpi_isa_irq_penalty[link->irq. | |
518 | possible[i]] += | |
519 | penalty; | |
520 | } | |
521 | ||
522 | } else if (link->irq.active && | |
523 | (link->irq.active < ACPI_MAX_ISA_IRQS)) { | |
524 | acpi_isa_irq_penalty[link->irq.active] += | |
525 | PIRQ_PENALTY_PCI_POSSIBLE; | |
526 | } | |
527 | } | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
32836259 | 532 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 533 | |
4be44fcd | 534 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 535 | { |
4be44fcd LB |
536 | int irq; |
537 | int i; | |
1da177e4 | 538 | |
87bec66b DSL |
539 | if (link->irq.initialized) { |
540 | if (link->refcnt == 0) | |
541 | /* This means the link is disabled but initialized */ | |
542 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 543 | return 0; |
87bec66b | 544 | } |
1da177e4 LT |
545 | |
546 | /* | |
547 | * search for active IRQ in list of possible IRQs. | |
548 | */ | |
549 | for (i = 0; i < link->irq.possible_count; ++i) { | |
550 | if (link->irq.active == link->irq.possible[i]) | |
551 | break; | |
552 | } | |
553 | /* | |
554 | * forget active IRQ that is not in possible list | |
555 | */ | |
556 | if (i == link->irq.possible_count) { | |
557 | if (acpi_strict) | |
cece9296 LB |
558 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
559 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
560 | link->irq.active = 0; |
561 | } | |
562 | ||
563 | /* | |
564 | * if active found, use it; else pick entry from end of possible list. | |
565 | */ | |
1c9ca3a7 | 566 | if (link->irq.active) |
1da177e4 | 567 | irq = link->irq.active; |
1c9ca3a7 | 568 | else |
1da177e4 | 569 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
570 | |
571 | if (acpi_irq_balance || !link->irq.active) { | |
572 | /* | |
573 | * Select the best IRQ. This is done in reverse to promote | |
574 | * the use of IRQs 9, 10, 11, and >15. | |
575 | */ | |
576 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
103544d8 SK |
577 | if (acpi_irq_get_penalty(irq) > |
578 | acpi_irq_get_penalty(link->irq.possible[i])) | |
1da177e4 LT |
579 | irq = link->irq.possible[i]; |
580 | } | |
581 | } | |
103544d8 | 582 | if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) { |
5ebc7603 JL |
583 | printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. " |
584 | "Try pci=noacpi or acpi=off\n", | |
585 | acpi_device_name(link->device), | |
586 | acpi_device_bid(link->device)); | |
587 | return -ENODEV; | |
588 | } | |
1da177e4 LT |
589 | |
590 | /* Attempt to enable the link device at this IRQ. */ | |
591 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
592 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
593 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 594 | acpi_device_name(link->device), |
6468463a | 595 | acpi_device_bid(link->device)); |
d550d98d | 596 | return -ENODEV; |
1da177e4 | 597 | } else { |
98756f53 SK |
598 | if (link->irq.active < ACPI_MAX_ISA_IRQS) |
599 | acpi_isa_irq_penalty[link->irq.active] += | |
600 | PIRQ_PENALTY_PCI_USING; | |
601 | ||
90fd94e4 | 602 | pr_info("%s [%s] enabled at IRQ %d\n", |
4be44fcd LB |
603 | acpi_device_name(link->device), |
604 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
605 | } |
606 | ||
607 | link->irq.initialized = 1; | |
d550d98d | 608 | return 0; |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
87bec66b | 612 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
613 | * success: return IRQ >= 0 |
614 | * failure: return -1 | |
615 | */ | |
1c9ca3a7 BH |
616 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
617 | int *polarity, char **name) | |
1da177e4 | 618 | { |
c9d62443 BH |
619 | int result; |
620 | struct acpi_device *device; | |
621 | struct acpi_pci_link *link; | |
1da177e4 | 622 | |
1da177e4 LT |
623 | result = acpi_bus_get_device(handle, &device); |
624 | if (result) { | |
6468463a | 625 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 626 | return -1; |
1da177e4 LT |
627 | } |
628 | ||
50dd0969 | 629 | link = acpi_driver_data(device); |
1da177e4 | 630 | if (!link) { |
6468463a | 631 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 632 | return -1; |
1da177e4 LT |
633 | } |
634 | ||
635 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
636 | if (index) { | |
6468463a | 637 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 638 | return -1; |
1da177e4 LT |
639 | } |
640 | ||
36e43095 | 641 | mutex_lock(&acpi_link_lock); |
87bec66b | 642 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 643 | mutex_unlock(&acpi_link_lock); |
d550d98d | 644 | return -1; |
87bec66b | 645 | } |
4be44fcd | 646 | |
1da177e4 | 647 | if (!link->irq.active) { |
36e43095 | 648 | mutex_unlock(&acpi_link_lock); |
6468463a | 649 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 650 | return -1; |
1da177e4 | 651 | } |
4be44fcd | 652 | link->refcnt++; |
36e43095 | 653 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 654 | |
50eca3eb BM |
655 | if (triggering) |
656 | *triggering = link->irq.triggering; | |
657 | if (polarity) | |
658 | *polarity = link->irq.polarity; | |
4be44fcd LB |
659 | if (name) |
660 | *name = acpi_device_bid(link->device); | |
87bec66b | 661 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
662 | "Link %s is referenced\n", |
663 | acpi_device_bid(link->device))); | |
d550d98d | 664 | return (link->irq.active); |
1da177e4 LT |
665 | } |
666 | ||
87bec66b DSL |
667 | /* |
668 | * We don't change link's irq information here. After it is reenabled, we | |
669 | * continue use the info | |
670 | */ | |
4be44fcd | 671 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 672 | { |
c9d62443 BH |
673 | struct acpi_device *device; |
674 | struct acpi_pci_link *link; | |
4be44fcd | 675 | acpi_status result; |
87bec66b | 676 | |
87bec66b DSL |
677 | result = acpi_bus_get_device(handle, &device); |
678 | if (result) { | |
6468463a | 679 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 680 | return -1; |
87bec66b | 681 | } |
1da177e4 | 682 | |
50dd0969 | 683 | link = acpi_driver_data(device); |
87bec66b | 684 | if (!link) { |
6468463a | 685 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 686 | return -1; |
87bec66b DSL |
687 | } |
688 | ||
36e43095 | 689 | mutex_lock(&acpi_link_lock); |
87bec66b | 690 | if (!link->irq.initialized) { |
36e43095 | 691 | mutex_unlock(&acpi_link_lock); |
6468463a | 692 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 693 | return -1; |
87bec66b | 694 | } |
ecc21ebe DSL |
695 | #ifdef FUTURE_USE |
696 | /* | |
697 | * The Link reference count allows us to _DISable an unused link | |
698 | * and suspend time, and set it again on resume. | |
699 | * However, 2.6.12 still has irq_router.resume | |
700 | * which blindly restores the link state. | |
701 | * So we disable the reference count method | |
702 | * to prevent duplicate acpi_pci_link_set() | |
703 | * which would harm some systems | |
704 | */ | |
4be44fcd | 705 | link->refcnt--; |
ecc21ebe | 706 | #endif |
87bec66b | 707 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
708 | "Link %s is dereferenced\n", |
709 | acpi_device_bid(link->device))); | |
87bec66b | 710 | |
1c9ca3a7 | 711 | if (link->refcnt == 0) |
383d7a11 | 712 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 713 | |
36e43095 | 714 | mutex_unlock(&acpi_link_lock); |
d550d98d | 715 | return (link->irq.active); |
87bec66b | 716 | } |
4be44fcd | 717 | |
1da177e4 LT |
718 | /* -------------------------------------------------------------------------- |
719 | Driver Interface | |
720 | -------------------------------------------------------------------------- */ | |
721 | ||
4daeaf68 RW |
722 | static int acpi_pci_link_add(struct acpi_device *device, |
723 | const struct acpi_device_id *not_used) | |
1da177e4 | 724 | { |
c9d62443 BH |
725 | int result; |
726 | struct acpi_pci_link *link; | |
727 | int i; | |
4be44fcd | 728 | int found = 0; |
1da177e4 | 729 | |
36bcbec7 | 730 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 731 | if (!link) |
d550d98d | 732 | return -ENOMEM; |
1da177e4 LT |
733 | |
734 | link->device = device; | |
1da177e4 LT |
735 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
736 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 737 | device->driver_data = link; |
1da177e4 | 738 | |
36e43095 | 739 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
740 | result = acpi_pci_link_get_possible(link); |
741 | if (result) | |
742 | goto end; | |
743 | ||
744 | /* query and set link->irq.active */ | |
745 | acpi_pci_link_get_current(link); | |
746 | ||
0dc070bb | 747 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 748 | acpi_device_bid(device)); |
1da177e4 LT |
749 | for (i = 0; i < link->irq.possible_count; i++) { |
750 | if (link->irq.active == link->irq.possible[i]) { | |
be96447e | 751 | printk(KERN_CONT " *%d", link->irq.possible[i]); |
1da177e4 | 752 | found = 1; |
4be44fcd | 753 | } else |
be96447e | 754 | printk(KERN_CONT " %d", link->irq.possible[i]); |
1da177e4 LT |
755 | } |
756 | ||
be96447e | 757 | printk(KERN_CONT ")"); |
1da177e4 LT |
758 | |
759 | if (!found) | |
be96447e | 760 | printk(KERN_CONT " *%d", link->irq.active); |
1da177e4 | 761 | |
4be44fcd | 762 | if (!link->device->status.enabled) |
be96447e | 763 | printk(KERN_CONT ", disabled."); |
1da177e4 | 764 | |
be96447e | 765 | printk(KERN_CONT "\n"); |
1da177e4 | 766 | |
5f0dccaa | 767 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 768 | |
4be44fcd | 769 | end: |
1da177e4 | 770 | /* disable all links -- to be activated on use */ |
383d7a11 | 771 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
36e43095 | 772 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
773 | |
774 | if (result) | |
775 | kfree(link); | |
776 | ||
4daeaf68 | 777 | return result < 0 ? result : 1; |
1da177e4 LT |
778 | } |
779 | ||
4be44fcd | 780 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 781 | { |
697a2d63 | 782 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 783 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
784 | |
785 | return 0; | |
697a2d63 LT |
786 | } |
787 | ||
c3146df2 | 788 | static void irqrouter_resume(void) |
1da177e4 | 789 | { |
c9d62443 | 790 | struct acpi_pci_link *link; |
1da177e4 | 791 | |
5f0dccaa | 792 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 793 | acpi_pci_link_resume(link); |
1da177e4 | 794 | } |
1da177e4 LT |
795 | } |
796 | ||
4daeaf68 | 797 | static void acpi_pci_link_remove(struct acpi_device *device) |
1da177e4 | 798 | { |
c9d62443 | 799 | struct acpi_pci_link *link; |
1da177e4 | 800 | |
50dd0969 | 801 | link = acpi_driver_data(device); |
1da177e4 | 802 | |
36e43095 | 803 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 804 | list_del(&link->list); |
36e43095 | 805 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
806 | |
807 | kfree(link); | |
1da177e4 LT |
808 | } |
809 | ||
810 | /* | |
5c5087a5 | 811 | * modify acpi_isa_irq_penalty[] from cmdline |
1da177e4 LT |
812 | */ |
813 | static int __init acpi_irq_penalty_update(char *str, int used) | |
814 | { | |
815 | int i; | |
816 | ||
817 | for (i = 0; i < 16; i++) { | |
818 | int retval; | |
819 | int irq; | |
5c5087a5 | 820 | int new_penalty; |
1da177e4 | 821 | |
4be44fcd | 822 | retval = get_option(&str, &irq); |
1da177e4 LT |
823 | |
824 | if (!retval) | |
825 | break; /* no number found */ | |
826 | ||
5c5087a5 SK |
827 | /* see if this is a ISA IRQ */ |
828 | if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS)) | |
e2497145 RW |
829 | continue; |
830 | ||
1da177e4 | 831 | if (used) |
eeaed4bb | 832 | new_penalty = acpi_isa_irq_penalty[irq] + |
5c5087a5 | 833 | PIRQ_PENALTY_ISA_USED; |
1da177e4 | 834 | else |
5c5087a5 | 835 | new_penalty = 0; |
1da177e4 | 836 | |
5c5087a5 | 837 | acpi_isa_irq_penalty[irq] = new_penalty; |
1da177e4 LT |
838 | if (retval != 2) /* no next number */ |
839 | break; | |
840 | } | |
841 | return 1; | |
842 | } | |
843 | ||
844 | /* | |
845 | * We'd like PNP to call this routine for the | |
846 | * single ISA_USED value for each legacy device. | |
847 | * But instead it calls us with each POSSIBLE setting. | |
848 | * There is no ISA_POSSIBLE weight, so we simply use | |
849 | * the (small) PCI_USING penalty. | |
850 | */ | |
c9c3e457 | 851 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 852 | { |
5c5087a5 | 853 | if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty))) |
eeaed4bb | 854 | acpi_isa_irq_penalty[irq] += |
54794580 | 855 | (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING); |
1da177e4 LT |
856 | } |
857 | ||
5ebc7603 JL |
858 | bool acpi_isa_irq_available(int irq) |
859 | { | |
5c5087a5 | 860 | return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) || |
103544d8 | 861 | acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS); |
5ebc7603 JL |
862 | } |
863 | ||
f1caa61d SK |
864 | void acpi_penalize_sci_irq(int irq, int trigger, int polarity) |
865 | { | |
866 | sci_irq = irq; | |
867 | ||
868 | if (trigger == ACPI_MADT_TRIGGER_LEVEL && | |
869 | polarity == ACPI_MADT_POLARITY_ACTIVE_LOW) | |
870 | sci_penalty = PIRQ_PENALTY_PCI_USING; | |
871 | else | |
872 | sci_penalty = PIRQ_PENALTY_ISA_ALWAYS; | |
873 | } | |
874 | ||
1da177e4 LT |
875 | /* |
876 | * Over-ride default table to reserve additional IRQs for use by ISA | |
877 | * e.g. acpi_irq_isa=5 | |
878 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
879 | */ | |
880 | static int __init acpi_irq_isa(char *str) | |
881 | { | |
882 | return acpi_irq_penalty_update(str, 1); | |
883 | } | |
4be44fcd | 884 | |
1da177e4 LT |
885 | __setup("acpi_irq_isa=", acpi_irq_isa); |
886 | ||
887 | /* | |
888 | * Over-ride default table to free additional IRQs for use by PCI | |
889 | * e.g. acpi_irq_pci=7,15 | |
890 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
891 | */ | |
892 | static int __init acpi_irq_pci(char *str) | |
893 | { | |
894 | return acpi_irq_penalty_update(str, 0); | |
895 | } | |
4be44fcd | 896 | |
1da177e4 LT |
897 | __setup("acpi_irq_pci=", acpi_irq_pci); |
898 | ||
899 | static int __init acpi_irq_nobalance_set(char *str) | |
900 | { | |
901 | acpi_irq_balance = 0; | |
902 | return 1; | |
903 | } | |
4be44fcd | 904 | |
1da177e4 LT |
905 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
906 | ||
8a383ef0 | 907 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
908 | { |
909 | acpi_irq_balance = 1; | |
910 | return 1; | |
911 | } | |
1da177e4 | 912 | |
4be44fcd | 913 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 914 | |
c3146df2 | 915 | static struct syscore_ops irqrouter_syscore_ops = { |
4be44fcd | 916 | .resume = irqrouter_resume, |
1da177e4 LT |
917 | }; |
918 | ||
4daeaf68 | 919 | void __init acpi_pci_link_init(void) |
1da177e4 | 920 | { |
1da177e4 | 921 | if (acpi_noirq) |
4daeaf68 | 922 | return; |
1da177e4 | 923 | |
32836259 BH |
924 | if (acpi_irq_balance == -1) { |
925 | /* no command line switch: enable balancing in IOAPIC mode */ | |
926 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
927 | acpi_irq_balance = 1; | |
928 | else | |
929 | acpi_irq_balance = 0; | |
930 | } | |
4daeaf68 RW |
931 | register_syscore_ops(&irqrouter_syscore_ops); |
932 | acpi_scan_add_handler(&pci_link_handler); | |
1da177e4 | 933 | } |