Commit | Line | Data |
---|---|---|
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 | * | |
c6237b21 ML |
9 | * TBD: |
10 | * 1. Support more than one IRQ resource entry per link device (index). | |
1da177e4 LT |
11 | * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities |
12 | * for IRQ management (e.g. start()->_SRS). | |
13 | */ | |
14 | ||
de972fd8 RW |
15 | #define pr_fmt(fmt) "ACPI: PCI: " fmt |
16 | ||
c3146df2 | 17 | #include <linux/syscore_ops.h> |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/types.h> | |
1da177e4 LT |
22 | #include <linux/spinlock.h> |
23 | #include <linux/pm.h> | |
24 | #include <linux/pci.h> | |
36e43095 | 25 | #include <linux/mutex.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
8b48463f | 27 | #include <linux/acpi.h> |
103544d8 | 28 | #include <linux/irq.h> |
1da177e4 | 29 | |
c071b604 R |
30 | #include "internal.h" |
31 | ||
1da177e4 | 32 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 | 33 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
1c9ca3a7 BH |
34 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
35 | ||
4daeaf68 RW |
36 | static int acpi_pci_link_add(struct acpi_device *device, |
37 | const struct acpi_device_id *not_used); | |
38 | static void acpi_pci_link_remove(struct acpi_device *device); | |
1da177e4 | 39 | |
c97adf9e | 40 | static const struct acpi_device_id link_device_ids[] = { |
1ba90e3a TR |
41 | {"PNP0C0F", 0}, |
42 | {"", 0}, | |
43 | }; | |
1ba90e3a | 44 | |
4daeaf68 | 45 | static struct acpi_scan_handler pci_link_handler = { |
1ba90e3a | 46 | .ids = link_device_ids, |
4daeaf68 RW |
47 | .attach = acpi_pci_link_add, |
48 | .detach = acpi_pci_link_remove, | |
1da177e4 LT |
49 | }; |
50 | ||
87bec66b DSL |
51 | /* |
52 | * If a link is initialized, we never change its active and initialized | |
53 | * later even the link is disable. Instead, we just repick the active irq | |
54 | */ | |
1da177e4 | 55 | struct acpi_pci_link_irq { |
37c59391 | 56 | u32 active; /* Current IRQ */ |
50eca3eb | 57 | u8 triggering; /* All IRQs */ |
1c9ca3a7 | 58 | u8 polarity; /* All IRQs */ |
4be44fcd LB |
59 | u8 resource_type; |
60 | u8 possible_count; | |
37c59391 | 61 | u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; |
4be44fcd LB |
62 | u8 initialized:1; |
63 | u8 reserved:7; | |
1da177e4 LT |
64 | }; |
65 | ||
66 | struct acpi_pci_link { | |
5f0dccaa | 67 | struct list_head list; |
1c9ca3a7 BH |
68 | struct acpi_device *device; |
69 | struct acpi_pci_link_irq irq; | |
70 | int refcnt; | |
1da177e4 LT |
71 | }; |
72 | ||
5f0dccaa | 73 | static LIST_HEAD(acpi_link_list); |
e5685b9d | 74 | static DEFINE_MUTEX(acpi_link_lock); |
f1caa61d | 75 | static int sci_irq = -1, sci_penalty; |
1da177e4 | 76 | |
1da177e4 LT |
77 | /* -------------------------------------------------------------------------- |
78 | PCI Link Device Management | |
79 | -------------------------------------------------------------------------- */ | |
80 | ||
81 | /* | |
82 | * set context (link) possible list from resource list | |
83 | */ | |
1c9ca3a7 BH |
84 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
85 | void *context) | |
1da177e4 | 86 | { |
50dd0969 | 87 | struct acpi_pci_link *link = context; |
c02b2fcd | 88 | acpi_handle handle = link->device->handle; |
c9d62443 | 89 | u32 i; |
1da177e4 | 90 | |
eca008c8 | 91 | switch (resource->type) { |
50eca3eb | 92 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
4a5e3638 | 93 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 94 | return AE_OK; |
50eca3eb | 95 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
96 | { |
97 | struct acpi_resource_irq *p = &resource->data.irq; | |
2c65e312 | 98 | if (!p->interrupt_count) { |
c02b2fcd RW |
99 | acpi_handle_debug(handle, |
100 | "Blank _PRS IRQ resource\n"); | |
d550d98d | 101 | return AE_OK; |
1da177e4 | 102 | } |
4be44fcd | 103 | for (i = 0; |
50eca3eb | 104 | (i < p->interrupt_count |
4be44fcd LB |
105 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
106 | if (!p->interrupts[i]) { | |
de972fd8 RW |
107 | acpi_handle_debug(handle, |
108 | "Invalid _PRS IRQ %d\n", | |
109 | p->interrupts[i]); | |
4be44fcd LB |
110 | continue; |
111 | } | |
112 | link->irq.possible[i] = p->interrupts[i]; | |
113 | link->irq.possible_count++; | |
114 | } | |
50eca3eb BM |
115 | link->irq.triggering = p->triggering; |
116 | link->irq.polarity = p->polarity; | |
117 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 118 | break; |
1da177e4 | 119 | } |
50eca3eb | 120 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 121 | { |
50eca3eb | 122 | struct acpi_resource_extended_irq *p = |
4be44fcd | 123 | &resource->data.extended_irq; |
2c65e312 | 124 | if (!p->interrupt_count) { |
de972fd8 RW |
125 | acpi_handle_debug(handle, |
126 | "Blank _PRS EXT IRQ resource\n"); | |
d550d98d | 127 | return AE_OK; |
4be44fcd LB |
128 | } |
129 | for (i = 0; | |
50eca3eb | 130 | (i < p->interrupt_count |
4be44fcd LB |
131 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
132 | if (!p->interrupts[i]) { | |
de972fd8 RW |
133 | acpi_handle_debug(handle, |
134 | "Invalid _PRS IRQ %d\n", | |
135 | p->interrupts[i]); | |
4be44fcd LB |
136 | continue; |
137 | } | |
138 | link->irq.possible[i] = p->interrupts[i]; | |
139 | link->irq.possible_count++; | |
1da177e4 | 140 | } |
50eca3eb BM |
141 | link->irq.triggering = p->triggering; |
142 | link->irq.polarity = p->polarity; | |
143 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 144 | break; |
1da177e4 | 145 | } |
1da177e4 | 146 | default: |
de972fd8 RW |
147 | acpi_handle_debug(handle, "_PRS resource type 0x%x is not IRQ\n", |
148 | resource->type); | |
d550d98d | 149 | return AE_OK; |
1da177e4 LT |
150 | } |
151 | ||
d550d98d | 152 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
153 | } |
154 | ||
4be44fcd | 155 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 156 | { |
c02b2fcd | 157 | acpi_handle handle = link->device->handle; |
4be44fcd | 158 | acpi_status status; |
1da177e4 | 159 | |
c02b2fcd | 160 | status = acpi_walk_resources(handle, METHOD_NAME__PRS, |
4be44fcd | 161 | acpi_pci_link_check_possible, link); |
1da177e4 | 162 | if (ACPI_FAILURE(status)) { |
c02b2fcd | 163 | acpi_handle_debug(handle, "_PRS not present or invalid"); |
92d1b381 | 164 | return 0; |
1da177e4 LT |
165 | } |
166 | ||
c02b2fcd RW |
167 | acpi_handle_debug(handle, "Found %d possible IRQs\n", |
168 | link->irq.possible_count); | |
1da177e4 | 169 | |
d550d98d | 170 | return 0; |
1da177e4 LT |
171 | } |
172 | ||
1c9ca3a7 BH |
173 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
174 | void *context) | |
1da177e4 | 175 | { |
c9d62443 | 176 | int *irq = context; |
1da177e4 | 177 | |
eca008c8 | 178 | switch (resource->type) { |
4a5e3638 BH |
179 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
180 | case ACPI_RESOURCE_TYPE_END_TAG: | |
181 | return AE_OK; | |
50eca3eb | 182 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
183 | { |
184 | struct acpi_resource_irq *p = &resource->data.irq; | |
2c65e312 | 185 | if (!p->interrupt_count) { |
4be44fcd LB |
186 | /* |
187 | * IRQ descriptors may have no IRQ# bits set, | |
a8ab8ef4 | 188 | * particularly those w/ _STA disabled |
4be44fcd | 189 | */ |
c02b2fcd | 190 | pr_debug("Blank _CRS IRQ resource\n"); |
d550d98d | 191 | return AE_OK; |
4be44fcd LB |
192 | } |
193 | *irq = p->interrupts[0]; | |
194 | break; | |
1da177e4 | 195 | } |
50eca3eb | 196 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 197 | { |
50eca3eb | 198 | struct acpi_resource_extended_irq *p = |
4be44fcd | 199 | &resource->data.extended_irq; |
2c65e312 | 200 | if (!p->interrupt_count) { |
4be44fcd LB |
201 | /* |
202 | * extended IRQ descriptors must | |
203 | * return at least 1 IRQ | |
204 | */ | |
c02b2fcd | 205 | pr_debug("Blank _CRS EXT IRQ resource\n"); |
d550d98d | 206 | return AE_OK; |
4be44fcd LB |
207 | } |
208 | *irq = p->interrupts[0]; | |
209 | break; | |
1da177e4 | 210 | } |
d4ec6c7c | 211 | break; |
1da177e4 | 212 | default: |
c02b2fcd RW |
213 | pr_debug("_CRS resource type 0x%x is not IRQ\n", |
214 | resource->type); | |
d550d98d | 215 | return AE_OK; |
1da177e4 | 216 | } |
4a5e3638 | 217 | |
d550d98d | 218 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
219 | } |
220 | ||
221 | /* | |
222 | * Run _CRS and set link->irq.active | |
223 | * | |
224 | * return value: | |
225 | * 0 - success | |
226 | * !0 - failure | |
227 | */ | |
4be44fcd | 228 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 229 | { |
c02b2fcd | 230 | acpi_handle handle = link->device->handle; |
c9d62443 | 231 | acpi_status status; |
c02b2fcd | 232 | int result = 0; |
4be44fcd | 233 | int irq = 0; |
1da177e4 | 234 | |
1da177e4 LT |
235 | link->irq.active = 0; |
236 | ||
237 | /* in practice, status disabled is meaningless, ignore it */ | |
238 | if (acpi_strict) { | |
239 | /* Query _STA, set link->device->status */ | |
240 | result = acpi_bus_get_status(link->device); | |
241 | if (result) { | |
c02b2fcd | 242 | acpi_handle_err(handle, "Unable to read status\n"); |
1da177e4 LT |
243 | goto end; |
244 | } | |
245 | ||
246 | if (!link->device->status.enabled) { | |
c02b2fcd | 247 | acpi_handle_debug(handle, "Link disabled\n"); |
d550d98d | 248 | return 0; |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
c6237b21 ML |
252 | /* |
253 | * Query and parse _CRS to get the current IRQ assignment. | |
1da177e4 LT |
254 | */ |
255 | ||
c02b2fcd | 256 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
4be44fcd | 257 | acpi_pci_link_check_current, &irq); |
1da177e4 | 258 | if (ACPI_FAILURE(status)) { |
4c324548 | 259 | acpi_evaluation_failure_warn(handle, "_CRS", status); |
1da177e4 LT |
260 | result = -ENODEV; |
261 | goto end; | |
262 | } | |
263 | ||
264 | if (acpi_strict && !irq) { | |
c02b2fcd | 265 | acpi_handle_err(handle, "_CRS returned 0\n"); |
1da177e4 LT |
266 | result = -ENODEV; |
267 | } | |
268 | ||
269 | link->irq.active = irq; | |
270 | ||
c02b2fcd | 271 | acpi_handle_debug(handle, "Link at IRQ %d \n", link->irq.active); |
1da177e4 | 272 | |
4be44fcd | 273 | end: |
d550d98d | 274 | return result; |
1da177e4 LT |
275 | } |
276 | ||
4be44fcd | 277 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 278 | { |
1da177e4 | 279 | struct { |
4be44fcd LB |
280 | struct acpi_resource res; |
281 | struct acpi_resource end; | |
282 | } *resource; | |
283 | struct acpi_buffer buffer = { 0, NULL }; | |
c02b2fcd RW |
284 | acpi_handle handle = link->device->handle; |
285 | acpi_status status; | |
286 | int result; | |
1da177e4 | 287 | |
6eca4b4c | 288 | if (!irq) |
d550d98d | 289 | return -EINVAL; |
1da177e4 | 290 | |
36bcbec7 | 291 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 292 | if (!resource) |
d550d98d | 293 | return -ENOMEM; |
1da177e4 | 294 | |
4be44fcd | 295 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
296 | buffer.pointer = resource; |
297 | ||
4be44fcd | 298 | switch (link->irq.resource_type) { |
50eca3eb BM |
299 | case ACPI_RESOURCE_TYPE_IRQ: |
300 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 301 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
302 | resource->res.data.irq.triggering = link->irq.triggering; |
303 | resource->res.data.irq.polarity = | |
304 | link->irq.polarity; | |
305 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
c163f90c | 306 | resource->res.data.irq.shareable = |
4be44fcd | 307 | ACPI_EXCLUSIVE; |
1da177e4 | 308 | else |
c163f90c | 309 | resource->res.data.irq.shareable = ACPI_SHARED; |
50eca3eb | 310 | resource->res.data.irq.interrupt_count = 1; |
1da177e4 LT |
311 | resource->res.data.irq.interrupts[0] = irq; |
312 | break; | |
4be44fcd | 313 | |
50eca3eb BM |
314 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
315 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 316 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
317 | resource->res.data.extended_irq.producer_consumer = |
318 | ACPI_CONSUMER; | |
50eca3eb BM |
319 | resource->res.data.extended_irq.triggering = |
320 | link->irq.triggering; | |
321 | resource->res.data.extended_irq.polarity = | |
322 | link->irq.polarity; | |
323 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
1c5e1cdd | 324 | resource->res.data.extended_irq.shareable = |
4be44fcd | 325 | ACPI_EXCLUSIVE; |
1da177e4 | 326 | else |
1c5e1cdd | 327 | resource->res.data.extended_irq.shareable = ACPI_SHARED; |
50eca3eb | 328 | resource->res.data.extended_irq.interrupt_count = 1; |
1da177e4 LT |
329 | resource->res.data.extended_irq.interrupts[0] = irq; |
330 | /* ignore resource_source, it's optional */ | |
331 | break; | |
332 | default: | |
c02b2fcd RW |
333 | acpi_handle_err(handle, "Invalid resource type %d\n", |
334 | 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)) { | |
4c324548 | 347 | acpi_evaluation_failure_warn(handle, "_SRS", status); |
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) { | |
c02b2fcd | 355 | acpi_handle_err(handle, "Unable to read status\n"); |
1da177e4 LT |
356 | goto end; |
357 | } | |
c02b2fcd RW |
358 | if (!link->device->status.enabled) |
359 | acpi_handle_warn(handle, "Disabled and referenced, BIOS bug\n"); | |
1da177e4 LT |
360 | |
361 | /* Query _CRS, set link->irq.active */ | |
362 | result = acpi_pci_link_get_current(link); | |
363 | if (result) { | |
364 | goto end; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Is current setting not what we set? | |
369 | * set link->irq.active | |
370 | */ | |
371 | if (link->irq.active != irq) { | |
372 | /* | |
373 | * policy: when _CRS doesn't return what we just _SRS | |
374 | * assume _SRS worked and override _CRS value. | |
375 | */ | |
c02b2fcd RW |
376 | acpi_handle_warn(handle, "BIOS reported IRQ %d, using IRQ %d\n", |
377 | link->irq.active, irq); | |
1da177e4 LT |
378 | link->irq.active = irq; |
379 | } | |
380 | ||
c02b2fcd | 381 | acpi_handle_debug(handle, "Set IRQ %d\n", link->irq.active); |
4be44fcd LB |
382 | |
383 | end: | |
1da177e4 | 384 | kfree(resource); |
d550d98d | 385 | return result; |
1da177e4 LT |
386 | } |
387 | ||
1da177e4 LT |
388 | /* -------------------------------------------------------------------------- |
389 | PCI Link IRQ Management | |
390 | -------------------------------------------------------------------------- */ | |
391 | ||
392 | /* | |
393 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
394 | * Link Devices to move the PIRQs around to minimize sharing. | |
c6237b21 | 395 | * |
1da177e4 LT |
396 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs |
397 | * that the BIOS has already set to active. This is necessary because | |
398 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
399 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
400 | * even if acpi_irq_nobalance is set. | |
401 | * | |
402 | * A tables of penalties avoids directing PCI interrupts to well known | |
403 | * ISA IRQs. Boot params are available to over-ride the default table: | |
404 | * | |
405 | * List interrupts that are free for PCI use. | |
406 | * acpi_irq_pci=n[,m] | |
407 | * | |
408 | * List interrupts that should not be used for PCI: | |
409 | * acpi_irq_isa=n[,m] | |
410 | * | |
411 | * Note that PCI IRQ routers have a list of possible IRQs, | |
412 | * which may not include the IRQs this table says are available. | |
c6237b21 | 413 | * |
1da177e4 LT |
414 | * Since this heuristic can't tell the difference between a link |
415 | * that no device will attach to, vs. a link which may be shared | |
416 | * by multiple active devices -- it is not optimal. | |
417 | * | |
418 | * If interrupt performance is that important, get an IO-APIC system | |
419 | * with a pin dedicated to each device. Or for that matter, an MSI | |
420 | * enabled system. | |
421 | */ | |
422 | ||
5c5087a5 | 423 | #define ACPI_MAX_ISA_IRQS 16 |
1da177e4 | 424 | |
1da177e4 LT |
425 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) |
426 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
427 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
428 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
429 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
430 | ||
5c5087a5 | 431 | static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = { |
1da177e4 LT |
432 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ |
433 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
434 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
435 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
436 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
437 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
438 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
439 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
440 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
103544d8 SK |
441 | 0, /* IRQ9 PCI, often acpi */ |
442 | 0, /* IRQ10 PCI */ | |
443 | 0, /* IRQ11 PCI */ | |
1c9ca3a7 BH |
444 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ |
445 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
446 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
447 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
e2497145 | 448 | /* >IRQ15 */ |
1da177e4 LT |
449 | }; |
450 | ||
103544d8 SK |
451 | static int acpi_irq_pci_sharing_penalty(int irq) |
452 | { | |
453 | struct acpi_pci_link *link; | |
454 | int penalty = 0; | |
4a6e68bf | 455 | int i; |
103544d8 SK |
456 | |
457 | list_for_each_entry(link, &acpi_link_list, list) { | |
458 | /* | |
459 | * If a link is active, penalize its IRQ heavily | |
460 | * so we try to choose a different IRQ. | |
461 | */ | |
462 | if (link->irq.active && link->irq.active == irq) | |
463 | penalty += PIRQ_PENALTY_PCI_USING; | |
4a6e68bf SK |
464 | |
465 | /* | |
466 | * penalize the IRQs PCI might use, but not as severely. | |
467 | */ | |
468 | for (i = 0; i < link->irq.possible_count; i++) | |
469 | if (link->irq.possible[i] == irq) | |
470 | penalty += PIRQ_PENALTY_PCI_POSSIBLE / | |
471 | link->irq.possible_count; | |
103544d8 SK |
472 | } |
473 | ||
474 | return penalty; | |
475 | } | |
476 | ||
477 | static int acpi_irq_get_penalty(int irq) | |
478 | { | |
479 | int penalty = 0; | |
480 | ||
f1caa61d SK |
481 | if (irq == sci_irq) |
482 | penalty += sci_penalty; | |
103544d8 | 483 | |
f7eca374 SK |
484 | if (irq < ACPI_MAX_ISA_IRQS) |
485 | return penalty + acpi_isa_irq_penalty[irq]; | |
486 | ||
f1caa61d | 487 | return penalty + acpi_irq_pci_sharing_penalty(irq); |
103544d8 SK |
488 | } |
489 | ||
487cf917 SK |
490 | int __init acpi_irq_penalty_init(void) |
491 | { | |
492 | struct acpi_pci_link *link; | |
493 | int i; | |
494 | ||
495 | /* | |
496 | * Update penalties to facilitate IRQ balancing. | |
497 | */ | |
498 | list_for_each_entry(link, &acpi_link_list, list) { | |
499 | ||
500 | /* | |
501 | * reflect the possible and active irqs in the penalty table -- | |
502 | * useful for breaking ties. | |
503 | */ | |
504 | if (link->irq.possible_count) { | |
505 | int penalty = | |
506 | PIRQ_PENALTY_PCI_POSSIBLE / | |
507 | link->irq.possible_count; | |
508 | ||
509 | for (i = 0; i < link->irq.possible_count; i++) { | |
510 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS) | |
511 | acpi_isa_irq_penalty[link->irq. | |
512 | possible[i]] += | |
513 | penalty; | |
514 | } | |
515 | ||
516 | } else if (link->irq.active && | |
517 | (link->irq.active < ACPI_MAX_ISA_IRQS)) { | |
518 | acpi_isa_irq_penalty[link->irq.active] += | |
519 | PIRQ_PENALTY_PCI_POSSIBLE; | |
520 | } | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
32836259 | 526 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
1da177e4 | 527 | |
4be44fcd | 528 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 529 | { |
de972fd8 | 530 | acpi_handle handle = link->device->handle; |
4be44fcd LB |
531 | int irq; |
532 | int i; | |
1da177e4 | 533 | |
87bec66b DSL |
534 | if (link->irq.initialized) { |
535 | if (link->refcnt == 0) | |
536 | /* This means the link is disabled but initialized */ | |
537 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 538 | return 0; |
87bec66b | 539 | } |
1da177e4 LT |
540 | |
541 | /* | |
542 | * search for active IRQ in list of possible IRQs. | |
543 | */ | |
544 | for (i = 0; i < link->irq.possible_count; ++i) { | |
545 | if (link->irq.active == link->irq.possible[i]) | |
546 | break; | |
547 | } | |
548 | /* | |
549 | * forget active IRQ that is not in possible list | |
550 | */ | |
551 | if (i == link->irq.possible_count) { | |
552 | if (acpi_strict) | |
de972fd8 RW |
553 | acpi_handle_warn(handle, "_CRS %d not found in _PRS\n", |
554 | link->irq.active); | |
1da177e4 LT |
555 | link->irq.active = 0; |
556 | } | |
557 | ||
558 | /* | |
559 | * if active found, use it; else pick entry from end of possible list. | |
560 | */ | |
1c9ca3a7 | 561 | if (link->irq.active) |
1da177e4 | 562 | irq = link->irq.active; |
1c9ca3a7 | 563 | else |
1da177e4 | 564 | irq = link->irq.possible[link->irq.possible_count - 1]; |
1da177e4 LT |
565 | |
566 | if (acpi_irq_balance || !link->irq.active) { | |
567 | /* | |
568 | * Select the best IRQ. This is done in reverse to promote | |
569 | * the use of IRQs 9, 10, 11, and >15. | |
570 | */ | |
571 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
103544d8 SK |
572 | if (acpi_irq_get_penalty(irq) > |
573 | acpi_irq_get_penalty(link->irq.possible[i])) | |
1da177e4 LT |
574 | irq = link->irq.possible[i]; |
575 | } | |
576 | } | |
103544d8 | 577 | if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) { |
de972fd8 RW |
578 | acpi_handle_err(handle, |
579 | "No IRQ available. Try pci=noacpi or acpi=off\n"); | |
5ebc7603 JL |
580 | return -ENODEV; |
581 | } | |
1da177e4 LT |
582 | |
583 | /* Attempt to enable the link device at this IRQ. */ | |
584 | if (acpi_pci_link_set(link, irq)) { | |
de972fd8 RW |
585 | acpi_handle_err(handle, |
586 | "Unable to set IRQ. Try pci=noacpi or acpi=off\n"); | |
d550d98d | 587 | return -ENODEV; |
1da177e4 | 588 | } else { |
98756f53 SK |
589 | if (link->irq.active < ACPI_MAX_ISA_IRQS) |
590 | acpi_isa_irq_penalty[link->irq.active] += | |
591 | PIRQ_PENALTY_PCI_USING; | |
592 | ||
de972fd8 RW |
593 | acpi_handle_info(handle, "Enabled at IRQ %d\n", |
594 | link->irq.active); | |
1da177e4 LT |
595 | } |
596 | ||
597 | link->irq.initialized = 1; | |
d550d98d | 598 | return 0; |
1da177e4 LT |
599 | } |
600 | ||
601 | /* | |
87bec66b | 602 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
603 | * success: return IRQ >= 0 |
604 | * failure: return -1 | |
605 | */ | |
1c9ca3a7 BH |
606 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
607 | int *polarity, char **name) | |
1da177e4 | 608 | { |
99ece713 | 609 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
c9d62443 | 610 | struct acpi_pci_link *link; |
1da177e4 | 611 | |
99ece713 | 612 | if (!device) { |
de972fd8 | 613 | acpi_handle_err(handle, "Invalid link device\n"); |
d550d98d | 614 | return -1; |
1da177e4 LT |
615 | } |
616 | ||
50dd0969 | 617 | link = acpi_driver_data(device); |
1da177e4 | 618 | if (!link) { |
de972fd8 | 619 | acpi_handle_err(handle, "Invalid link context\n"); |
d550d98d | 620 | return -1; |
1da177e4 LT |
621 | } |
622 | ||
623 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
624 | if (index) { | |
de972fd8 | 625 | acpi_handle_err(handle, "Invalid index %d\n", index); |
d550d98d | 626 | return -1; |
1da177e4 LT |
627 | } |
628 | ||
36e43095 | 629 | mutex_lock(&acpi_link_lock); |
87bec66b | 630 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 631 | mutex_unlock(&acpi_link_lock); |
d550d98d | 632 | return -1; |
87bec66b | 633 | } |
4be44fcd | 634 | |
1da177e4 | 635 | if (!link->irq.active) { |
36e43095 | 636 | mutex_unlock(&acpi_link_lock); |
de972fd8 | 637 | acpi_handle_err(handle, "Link active IRQ is 0!\n"); |
d550d98d | 638 | return -1; |
1da177e4 | 639 | } |
4be44fcd | 640 | link->refcnt++; |
36e43095 | 641 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 642 | |
50eca3eb BM |
643 | if (triggering) |
644 | *triggering = link->irq.triggering; | |
645 | if (polarity) | |
646 | *polarity = link->irq.polarity; | |
4be44fcd LB |
647 | if (name) |
648 | *name = acpi_device_bid(link->device); | |
c02b2fcd | 649 | acpi_handle_debug(handle, "Link is referenced\n"); |
8698fab1 | 650 | return link->irq.active; |
1da177e4 LT |
651 | } |
652 | ||
87bec66b DSL |
653 | /* |
654 | * We don't change link's irq information here. After it is reenabled, we | |
655 | * continue use the info | |
656 | */ | |
4be44fcd | 657 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 658 | { |
99ece713 | 659 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
c9d62443 | 660 | struct acpi_pci_link *link; |
87bec66b | 661 | |
99ece713 | 662 | if (!device) { |
de972fd8 | 663 | acpi_handle_err(handle, "Invalid link device\n"); |
d550d98d | 664 | return -1; |
87bec66b | 665 | } |
1da177e4 | 666 | |
50dd0969 | 667 | link = acpi_driver_data(device); |
87bec66b | 668 | if (!link) { |
de972fd8 | 669 | acpi_handle_err(handle, "Invalid link context\n"); |
d550d98d | 670 | return -1; |
87bec66b DSL |
671 | } |
672 | ||
36e43095 | 673 | mutex_lock(&acpi_link_lock); |
87bec66b | 674 | if (!link->irq.initialized) { |
36e43095 | 675 | mutex_unlock(&acpi_link_lock); |
de972fd8 | 676 | acpi_handle_err(handle, "Link isn't initialized\n"); |
d550d98d | 677 | return -1; |
87bec66b | 678 | } |
ecc21ebe DSL |
679 | #ifdef FUTURE_USE |
680 | /* | |
681 | * The Link reference count allows us to _DISable an unused link | |
682 | * and suspend time, and set it again on resume. | |
683 | * However, 2.6.12 still has irq_router.resume | |
684 | * which blindly restores the link state. | |
685 | * So we disable the reference count method | |
686 | * to prevent duplicate acpi_pci_link_set() | |
687 | * which would harm some systems | |
688 | */ | |
4be44fcd | 689 | link->refcnt--; |
ecc21ebe | 690 | #endif |
c02b2fcd | 691 | acpi_handle_debug(handle, "Link is dereferenced\n"); |
87bec66b | 692 | |
1c9ca3a7 | 693 | if (link->refcnt == 0) |
383d7a11 | 694 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
1c9ca3a7 | 695 | |
36e43095 | 696 | mutex_unlock(&acpi_link_lock); |
8698fab1 | 697 | return link->irq.active; |
87bec66b | 698 | } |
4be44fcd | 699 | |
1da177e4 LT |
700 | /* -------------------------------------------------------------------------- |
701 | Driver Interface | |
702 | -------------------------------------------------------------------------- */ | |
703 | ||
4daeaf68 RW |
704 | static int acpi_pci_link_add(struct acpi_device *device, |
705 | const struct acpi_device_id *not_used) | |
1da177e4 | 706 | { |
de972fd8 | 707 | acpi_handle handle = device->handle; |
c9d62443 | 708 | struct acpi_pci_link *link; |
de972fd8 | 709 | int result; |
c9d62443 | 710 | int i; |
1da177e4 | 711 | |
36bcbec7 | 712 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 713 | if (!link) |
d550d98d | 714 | return -ENOMEM; |
1da177e4 LT |
715 | |
716 | link->device = device; | |
1da177e4 LT |
717 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
718 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
db89b4f0 | 719 | device->driver_data = link; |
1da177e4 | 720 | |
36e43095 | 721 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
722 | result = acpi_pci_link_get_possible(link); |
723 | if (result) | |
724 | goto end; | |
725 | ||
726 | /* query and set link->irq.active */ | |
727 | acpi_pci_link_get_current(link); | |
728 | ||
de972fd8 RW |
729 | pr_info("Interrupt link %s configured for IRQ %d\n", |
730 | acpi_device_bid(device), link->irq.active); | |
731 | ||
1da177e4 | 732 | for (i = 0; i < link->irq.possible_count; i++) { |
de972fd8 RW |
733 | if (link->irq.active != link->irq.possible[i]) |
734 | acpi_handle_debug(handle, "Possible IRQ %d\n", | |
735 | link->irq.possible[i]); | |
1da177e4 LT |
736 | } |
737 | ||
4be44fcd | 738 | if (!link->device->status.enabled) |
de972fd8 | 739 | pr_info("Interrupt link %s disabled\n", acpi_device_bid(device)); |
1da177e4 | 740 | |
5f0dccaa | 741 | list_add_tail(&link->list, &acpi_link_list); |
1da177e4 | 742 | |
4be44fcd | 743 | end: |
1da177e4 | 744 | /* disable all links -- to be activated on use */ |
de972fd8 | 745 | acpi_evaluate_object(handle, "_DIS", NULL, NULL); |
36e43095 | 746 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
747 | |
748 | if (result) | |
749 | kfree(link); | |
750 | ||
4daeaf68 | 751 | return result < 0 ? result : 1; |
1da177e4 LT |
752 | } |
753 | ||
4be44fcd | 754 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 755 | { |
697a2d63 | 756 | if (link->refcnt && link->irq.active && link->irq.initialized) |
d550d98d | 757 | return (acpi_pci_link_set(link, link->irq.active)); |
1c9ca3a7 BH |
758 | |
759 | return 0; | |
697a2d63 LT |
760 | } |
761 | ||
c3146df2 | 762 | static void irqrouter_resume(void) |
1da177e4 | 763 | { |
c9d62443 | 764 | struct acpi_pci_link *link; |
1da177e4 | 765 | |
5f0dccaa | 766 | list_for_each_entry(link, &acpi_link_list, list) { |
697a2d63 | 767 | acpi_pci_link_resume(link); |
1da177e4 | 768 | } |
1da177e4 LT |
769 | } |
770 | ||
4daeaf68 | 771 | static void acpi_pci_link_remove(struct acpi_device *device) |
1da177e4 | 772 | { |
c9d62443 | 773 | struct acpi_pci_link *link; |
1da177e4 | 774 | |
50dd0969 | 775 | link = acpi_driver_data(device); |
1da177e4 | 776 | |
36e43095 | 777 | mutex_lock(&acpi_link_lock); |
5f0dccaa | 778 | list_del(&link->list); |
36e43095 | 779 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
780 | |
781 | kfree(link); | |
1da177e4 LT |
782 | } |
783 | ||
784 | /* | |
5c5087a5 | 785 | * modify acpi_isa_irq_penalty[] from cmdline |
1da177e4 LT |
786 | */ |
787 | static int __init acpi_irq_penalty_update(char *str, int used) | |
788 | { | |
789 | int i; | |
790 | ||
791 | for (i = 0; i < 16; i++) { | |
792 | int retval; | |
793 | int irq; | |
5c5087a5 | 794 | int new_penalty; |
1da177e4 | 795 | |
4be44fcd | 796 | retval = get_option(&str, &irq); |
1da177e4 LT |
797 | |
798 | if (!retval) | |
799 | break; /* no number found */ | |
800 | ||
5c5087a5 SK |
801 | /* see if this is a ISA IRQ */ |
802 | if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS)) | |
e2497145 RW |
803 | continue; |
804 | ||
1da177e4 | 805 | if (used) |
eeaed4bb | 806 | new_penalty = acpi_isa_irq_penalty[irq] + |
5c5087a5 | 807 | PIRQ_PENALTY_ISA_USED; |
1da177e4 | 808 | else |
5c5087a5 | 809 | new_penalty = 0; |
1da177e4 | 810 | |
5c5087a5 | 811 | acpi_isa_irq_penalty[irq] = new_penalty; |
1da177e4 LT |
812 | if (retval != 2) /* no next number */ |
813 | break; | |
814 | } | |
815 | return 1; | |
816 | } | |
817 | ||
818 | /* | |
819 | * We'd like PNP to call this routine for the | |
820 | * single ISA_USED value for each legacy device. | |
821 | * But instead it calls us with each POSSIBLE setting. | |
822 | * There is no ISA_POSSIBLE weight, so we simply use | |
823 | * the (small) PCI_USING penalty. | |
824 | */ | |
c9c3e457 | 825 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 826 | { |
5c5087a5 | 827 | if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty))) |
eeaed4bb | 828 | acpi_isa_irq_penalty[irq] += |
54794580 | 829 | (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING); |
1da177e4 LT |
830 | } |
831 | ||
5ebc7603 JL |
832 | bool acpi_isa_irq_available(int irq) |
833 | { | |
5c5087a5 | 834 | return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) || |
103544d8 | 835 | acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS); |
5ebc7603 JL |
836 | } |
837 | ||
f1caa61d SK |
838 | void acpi_penalize_sci_irq(int irq, int trigger, int polarity) |
839 | { | |
840 | sci_irq = irq; | |
841 | ||
842 | if (trigger == ACPI_MADT_TRIGGER_LEVEL && | |
843 | polarity == ACPI_MADT_POLARITY_ACTIVE_LOW) | |
844 | sci_penalty = PIRQ_PENALTY_PCI_USING; | |
845 | else | |
846 | sci_penalty = PIRQ_PENALTY_ISA_ALWAYS; | |
847 | } | |
848 | ||
1da177e4 LT |
849 | /* |
850 | * Over-ride default table to reserve additional IRQs for use by ISA | |
851 | * e.g. acpi_irq_isa=5 | |
852 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
853 | */ | |
854 | static int __init acpi_irq_isa(char *str) | |
855 | { | |
856 | return acpi_irq_penalty_update(str, 1); | |
857 | } | |
4be44fcd | 858 | |
1da177e4 LT |
859 | __setup("acpi_irq_isa=", acpi_irq_isa); |
860 | ||
861 | /* | |
862 | * Over-ride default table to free additional IRQs for use by PCI | |
863 | * e.g. acpi_irq_pci=7,15 | |
864 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
865 | */ | |
866 | static int __init acpi_irq_pci(char *str) | |
867 | { | |
868 | return acpi_irq_penalty_update(str, 0); | |
869 | } | |
4be44fcd | 870 | |
1da177e4 LT |
871 | __setup("acpi_irq_pci=", acpi_irq_pci); |
872 | ||
873 | static int __init acpi_irq_nobalance_set(char *str) | |
874 | { | |
875 | acpi_irq_balance = 0; | |
876 | return 1; | |
877 | } | |
4be44fcd | 878 | |
1da177e4 LT |
879 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
880 | ||
8a383ef0 | 881 | static int __init acpi_irq_balance_set(char *str) |
1da177e4 LT |
882 | { |
883 | acpi_irq_balance = 1; | |
884 | return 1; | |
885 | } | |
1da177e4 | 886 | |
4be44fcd | 887 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 888 | |
c3146df2 | 889 | static struct syscore_ops irqrouter_syscore_ops = { |
4be44fcd | 890 | .resume = irqrouter_resume, |
1da177e4 LT |
891 | }; |
892 | ||
4daeaf68 | 893 | void __init acpi_pci_link_init(void) |
1da177e4 | 894 | { |
1da177e4 | 895 | if (acpi_noirq) |
4daeaf68 | 896 | return; |
1da177e4 | 897 | |
32836259 BH |
898 | if (acpi_irq_balance == -1) { |
899 | /* no command line switch: enable balancing in IOAPIC mode */ | |
900 | if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) | |
901 | acpi_irq_balance = 1; | |
902 | else | |
903 | acpi_irq_balance = 0; | |
904 | } | |
4daeaf68 RW |
905 | register_syscore_ops(&irqrouter_syscore_ops); |
906 | acpi_scan_add_handler(&pci_link_handler); | |
1da177e4 | 907 | } |