Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) | |
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> | |
39488b04 BH |
7 | * (c) Copyright 2008 Hewlett-Packard Development Company, L.P. |
8 | * Bjorn Helgaas <bjorn.helgaas@hp.com> | |
1da177e4 LT |
9 | * |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | */ | |
28 | ||
1da177e4 | 29 | |
391df5dc | 30 | #include <linux/dmi.h> |
1da177e4 LT |
31 | #include <linux/kernel.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/types.h> | |
1da177e4 LT |
35 | #include <linux/spinlock.h> |
36 | #include <linux/pm.h> | |
37 | #include <linux/pci.h> | |
38 | #include <linux/acpi.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 | 40 | |
a192a958 LB |
41 | #define PREFIX "ACPI: " |
42 | ||
1da177e4 | 43 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 44 | ACPI_MODULE_NAME("pci_irq"); |
1da177e4 | 45 | |
f748bafa | 46 | struct acpi_prt_entry { |
3604a9f4 | 47 | struct list_head list; |
f748bafa BH |
48 | struct acpi_pci_id id; |
49 | u8 pin; | |
4eaf6db3 BH |
50 | acpi_handle link; |
51 | u32 index; /* GSI, or link _CRS index */ | |
f748bafa BH |
52 | }; |
53 | ||
cf68b80b BH |
54 | static inline char pin_name(int pin) |
55 | { | |
e64e9db5 | 56 | return 'A' + pin - 1; |
cf68b80b BH |
57 | } |
58 | ||
1da177e4 LT |
59 | /* -------------------------------------------------------------------------- |
60 | PCI IRQ Routing Table (PRT) Support | |
61 | -------------------------------------------------------------------------- */ | |
62 | ||
391df5dc | 63 | /* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */ |
609d4bc9 | 64 | static const struct dmi_system_id medion_md9580[] = { |
391df5dc BH |
65 | { |
66 | .ident = "Medion MD9580-F laptop", | |
67 | .matches = { | |
68 | DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"), | |
69 | DMI_MATCH(DMI_PRODUCT_NAME, "A555"), | |
70 | }, | |
71 | }, | |
72 | { } | |
73 | }; | |
74 | ||
75 | /* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */ | |
609d4bc9 | 76 | static const struct dmi_system_id dell_optiplex[] = { |
391df5dc BH |
77 | { |
78 | .ident = "Dell Optiplex GX1", | |
79 | .matches = { | |
80 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
81 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"), | |
82 | }, | |
83 | }, | |
84 | { } | |
85 | }; | |
86 | ||
87 | /* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */ | |
609d4bc9 | 88 | static const struct dmi_system_id hp_t5710[] = { |
391df5dc BH |
89 | { |
90 | .ident = "HP t5710", | |
91 | .matches = { | |
92 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
93 | DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"), | |
94 | DMI_MATCH(DMI_BOARD_NAME, "098Ch"), | |
95 | }, | |
96 | }, | |
97 | { } | |
98 | }; | |
99 | ||
100 | struct prt_quirk { | |
609d4bc9 | 101 | const struct dmi_system_id *system; |
391df5dc BH |
102 | unsigned int segment; |
103 | unsigned int bus; | |
104 | unsigned int device; | |
105 | unsigned char pin; | |
609d4bc9 JB |
106 | const char *source; /* according to BIOS */ |
107 | const char *actual_source; | |
391df5dc BH |
108 | }; |
109 | ||
c458033c BH |
110 | #define PCI_INTX_PIN(c) (c - 'A' + 1) |
111 | ||
391df5dc BH |
112 | /* |
113 | * These systems have incorrect _PRT entries. The BIOS claims the PCI | |
114 | * interrupt at the listed segment/bus/device/pin is connected to the first | |
115 | * link device, but it is actually connected to the second. | |
116 | */ | |
609d4bc9 | 117 | static const struct prt_quirk prt_quirks[] = { |
c458033c | 118 | { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'), |
b97d4803 BH |
119 | "\\_SB_.PCI0.ISA_.LNKA", |
120 | "\\_SB_.PCI0.ISA_.LNKB"}, | |
c458033c | 121 | { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'), |
391df5dc BH |
122 | "\\_SB_.LNKB", |
123 | "\\_SB_.LNKA"}, | |
c458033c | 124 | { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'), |
391df5dc BH |
125 | "\\_SB_.PCI0.LNK1", |
126 | "\\_SB_.PCI0.LNK3"}, | |
127 | }; | |
128 | ||
3f0f3c27 BH |
129 | static void do_prt_fixups(struct acpi_prt_entry *entry, |
130 | struct acpi_pci_routing_table *prt) | |
391df5dc BH |
131 | { |
132 | int i; | |
609d4bc9 | 133 | const struct prt_quirk *quirk; |
391df5dc BH |
134 | |
135 | for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) { | |
136 | quirk = &prt_quirks[i]; | |
137 | ||
138 | /* All current quirks involve link devices, not GSIs */ | |
139 | if (!prt->source) | |
140 | continue; | |
141 | ||
142 | if (dmi_check_system(quirk->system) && | |
143 | entry->id.segment == quirk->segment && | |
144 | entry->id.bus == quirk->bus && | |
145 | entry->id.device == quirk->device && | |
c458033c | 146 | entry->pin == quirk->pin && |
391df5dc BH |
147 | !strcmp(prt->source, quirk->source) && |
148 | strlen(prt->source) >= strlen(quirk->actual_source)) { | |
149 | printk(KERN_WARNING PREFIX "firmware reports " | |
c83642d5 | 150 | "%04x:%02x:%02x PCI INT %c connected to %s; " |
391df5dc BH |
151 | "changing to %s\n", |
152 | entry->id.segment, entry->id.bus, | |
cf68b80b | 153 | entry->id.device, pin_name(entry->pin), |
391df5dc BH |
154 | prt->source, quirk->actual_source); |
155 | strcpy(prt->source, quirk->actual_source); | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
181380b7 YL |
160 | static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev, |
161 | int pin, struct acpi_pci_routing_table *prt, | |
162 | struct acpi_prt_entry **entry_ptr) | |
1da177e4 | 163 | { |
181380b7 YL |
164 | int segment = pci_domain_nr(dev->bus); |
165 | int bus = dev->bus->number; | |
166 | int device = PCI_SLOT(dev->devfn); | |
3604a9f4 | 167 | struct acpi_prt_entry *entry; |
1da177e4 | 168 | |
181380b7 YL |
169 | if (((prt->address >> 16) & 0xffff) != device || |
170 | prt->pin + 1 != pin) | |
171 | return -ENODEV; | |
172 | ||
36bcbec7 | 173 | entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); |
1da177e4 | 174 | if (!entry) |
d550d98d | 175 | return -ENOMEM; |
1da177e4 | 176 | |
e64e9db5 BH |
177 | /* |
178 | * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses | |
179 | * 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert | |
180 | * it here. | |
181 | */ | |
79c44122 BH |
182 | entry->id.segment = segment; |
183 | entry->id.bus = bus; | |
1da177e4 | 184 | entry->id.device = (prt->address >> 16) & 0xFFFF; |
e64e9db5 | 185 | entry->pin = prt->pin + 1; |
1da177e4 | 186 | |
391df5dc BH |
187 | do_prt_fixups(entry, prt); |
188 | ||
4eaf6db3 BH |
189 | entry->index = prt->source_index; |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Type 1: Dynamic | |
193 | * --------------- | |
194 | * The 'source' field specifies the PCI interrupt link device used to | |
195 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' | |
196 | * indicates which resource descriptor in the resource template (of | |
197 | * the link device) this interrupt is allocated from. | |
198 | * | |
199 | * NOTE: Don't query the Link Device for IRQ information at this time | |
200 | * because Link Device enumeration may not have occurred yet | |
201 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI | |
202 | * namespace). | |
203 | */ | |
4eaf6db3 BH |
204 | if (prt->source[0]) |
205 | acpi_get_handle(handle, prt->source, &entry->link); | |
206 | ||
1da177e4 LT |
207 | /* |
208 | * Type 2: Static | |
209 | * -------------- | |
210 | * The 'source' field is NULL, and the 'source_index' field specifies | |
211 | * the IRQ value, which is hardwired to specific interrupt inputs on | |
212 | * the interrupt controller. | |
213 | */ | |
1da177e4 LT |
214 | |
215 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, | |
21a53283 | 216 | " %04x:%02x:%02x[%c] -> %s[%d]\n", |
4be44fcd | 217 | entry->id.segment, entry->id.bus, |
cf68b80b | 218 | entry->id.device, pin_name(entry->pin), |
4eaf6db3 | 219 | prt->source, entry->index)); |
1da177e4 | 220 | |
181380b7 | 221 | *entry_ptr = entry; |
1da177e4 | 222 | |
d550d98d | 223 | return 0; |
1da177e4 LT |
224 | } |
225 | ||
181380b7 YL |
226 | static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev, |
227 | int pin, struct acpi_prt_entry **entry_ptr) | |
1da177e4 | 228 | { |
2320ac6c BH |
229 | acpi_status status; |
230 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
231 | struct acpi_pci_routing_table *entry; | |
181380b7 | 232 | acpi_handle handle = NULL; |
1da177e4 | 233 | |
181380b7 YL |
234 | if (dev->bus->bridge) |
235 | handle = ACPI_HANDLE(dev->bus->bridge); | |
1da177e4 | 236 | |
181380b7 YL |
237 | if (!handle) |
238 | return -ENODEV; | |
1da177e4 | 239 | |
181380b7 | 240 | /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */ |
1da177e4 LT |
241 | status = acpi_get_irq_routing_table(handle, &buffer); |
242 | if (ACPI_FAILURE(status)) { | |
1da177e4 | 243 | kfree(buffer.pointer); |
d550d98d | 244 | return -ENODEV; |
1da177e4 LT |
245 | } |
246 | ||
2320ac6c | 247 | entry = buffer.pointer; |
1da177e4 | 248 | while (entry && (entry->length > 0)) { |
181380b7 YL |
249 | if (!acpi_pci_irq_check_entry(handle, dev, pin, |
250 | entry, entry_ptr)) | |
251 | break; | |
1da177e4 | 252 | entry = (struct acpi_pci_routing_table *) |
4be44fcd | 253 | ((unsigned long)entry + entry->length); |
1da177e4 LT |
254 | } |
255 | ||
2320ac6c | 256 | kfree(buffer.pointer); |
d550d98d | 257 | return 0; |
1da177e4 LT |
258 | } |
259 | ||
1da177e4 LT |
260 | /* -------------------------------------------------------------------------- |
261 | PCI Interrupt Routing Support | |
262 | -------------------------------------------------------------------------- */ | |
d7f6169a SA |
263 | #ifdef CONFIG_X86_IO_APIC |
264 | extern int noioapicquirk; | |
265 | extern int noioapicreroute; | |
266 | ||
267 | static int bridge_has_boot_interrupt_variant(struct pci_bus *bus) | |
268 | { | |
269 | struct pci_bus *bus_it; | |
270 | ||
271 | for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) { | |
272 | if (!bus_it->self) | |
273 | return 0; | |
274 | if (bus_it->self->irq_reroute_variant) | |
275 | return bus_it->self->irq_reroute_variant; | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ | |
282 | * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does | |
283 | * during interrupt handling). When this INTx generation cannot be disabled, | |
284 | * we reroute these interrupts to their legacy equivalent to get rid of | |
285 | * spurious interrupts. | |
286 | */ | |
287 | static int acpi_reroute_boot_interrupt(struct pci_dev *dev, | |
288 | struct acpi_prt_entry *entry) | |
289 | { | |
290 | if (noioapicquirk || noioapicreroute) { | |
291 | return 0; | |
292 | } else { | |
293 | switch (bridge_has_boot_interrupt_variant(dev->bus)) { | |
294 | case 0: | |
295 | /* no rerouting necessary */ | |
296 | return 0; | |
297 | case INTEL_IRQ_REROUTE_VARIANT: | |
298 | /* | |
299 | * Remap according to INTx routing table in 6700PXH | |
300 | * specs, intel order number 302628-002, section | |
301 | * 2.15.2. Other chipsets (80332, ...) have the same | |
302 | * mapping and are handled here as well. | |
303 | */ | |
304 | dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy " | |
305 | "IRQ %d\n", entry->index, | |
306 | (entry->index % 4) + 16); | |
307 | entry->index = (entry->index % 4) + 16; | |
308 | return 1; | |
309 | default: | |
310 | dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy " | |
311 | "IRQ: unknown mapping\n", entry->index); | |
312 | return -1; | |
313 | } | |
314 | } | |
315 | } | |
316 | #endif /* CONFIG_X86_IO_APIC */ | |
317 | ||
3f0f3c27 | 318 | static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) |
1da177e4 | 319 | { |
181380b7 | 320 | struct acpi_prt_entry *entry = NULL; |
5697b7ca BH |
321 | struct pci_dev *bridge; |
322 | u8 bridge_pin, orig_pin = pin; | |
181380b7 | 323 | int ret; |
1da177e4 | 324 | |
181380b7 YL |
325 | ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry); |
326 | if (!ret && entry) { | |
d7f6169a SA |
327 | #ifdef CONFIG_X86_IO_APIC |
328 | acpi_reroute_boot_interrupt(dev, entry); | |
329 | #endif /* CONFIG_X86_IO_APIC */ | |
3b1ea18d | 330 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n", |
1350487e | 331 | pci_name(dev), pin_name(pin))); |
3b1ea18d | 332 | return entry; |
1da177e4 | 333 | } |
4be44fcd | 334 | |
181380b7 | 335 | /* |
1da177e4 LT |
336 | * Attempt to derive an IRQ for this device from a parent bridge's |
337 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). | |
338 | */ | |
ee401363 BH |
339 | bridge = dev->bus->self; |
340 | while (bridge) { | |
c686d141 | 341 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
342 | |
343 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { | |
344 | /* PC card has the same IRQ as its cardbridge */ | |
8015a014 | 345 | bridge_pin = bridge->pin; |
1da177e4 | 346 | if (!bridge_pin) { |
4be44fcd LB |
347 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
348 | "No interrupt pin configured for device %s\n", | |
349 | pci_name(bridge))); | |
beba8a64 | 350 | return NULL; |
1da177e4 | 351 | } |
1da177e4 LT |
352 | pin = bridge_pin; |
353 | } | |
354 | ||
181380b7 YL |
355 | ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry); |
356 | if (!ret && entry) { | |
3b1ea18d BH |
357 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
358 | "Derived GSI for %s INT %c from %s\n", | |
359 | pci_name(dev), pin_name(orig_pin), | |
360 | pci_name(bridge))); | |
361 | return entry; | |
362 | } | |
ee401363 BH |
363 | |
364 | dev = bridge; | |
365 | bridge = dev->bus->self; | |
1da177e4 LT |
366 | } |
367 | ||
3b1ea18d BH |
368 | dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n", |
369 | pin_name(orig_pin)); | |
370 | return NULL; | |
1da177e4 LT |
371 | } |
372 | ||
c1aaae67 TN |
373 | #if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA) |
374 | static int acpi_isa_register_gsi(struct pci_dev *dev) | |
375 | { | |
376 | u32 dev_gsi; | |
377 | ||
378 | /* Interrupt Line values above 0xF are forbidden */ | |
379 | if (dev->irq > 0 && (dev->irq <= 0xF) && | |
380 | (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) { | |
381 | dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n", | |
382 | pin_name(dev->pin), dev->irq); | |
383 | acpi_register_gsi(&dev->dev, dev_gsi, | |
384 | ACPI_LEVEL_SENSITIVE, | |
385 | ACPI_ACTIVE_LOW); | |
386 | return 0; | |
387 | } | |
388 | return -EINVAL; | |
389 | } | |
390 | #else | |
391 | static inline int acpi_isa_register_gsi(struct pci_dev *dev) | |
392 | { | |
393 | return -ENODEV; | |
394 | } | |
395 | #endif | |
396 | ||
4be44fcd | 397 | int acpi_pci_irq_enable(struct pci_dev *dev) |
1da177e4 | 398 | { |
beba8a64 | 399 | struct acpi_prt_entry *entry; |
3f0f3c27 BH |
400 | int gsi; |
401 | u8 pin; | |
50eca3eb BM |
402 | int triggering = ACPI_LEVEL_SENSITIVE; |
403 | int polarity = ACPI_ACTIVE_LOW; | |
4be44fcd | 404 | char *link = NULL; |
c83642d5 | 405 | char link_desc[16]; |
4be44fcd | 406 | int rc; |
1da177e4 | 407 | |
8015a014 | 408 | pin = dev->pin; |
1da177e4 | 409 | if (!pin) { |
4be44fcd LB |
410 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
411 | "No interrupt pin configured for device %s\n", | |
412 | pci_name(dev))); | |
d550d98d | 413 | return 0; |
1da177e4 | 414 | } |
1da177e4 | 415 | |
beba8a64 | 416 | entry = acpi_pci_irq_lookup(dev, pin); |
5697b7ca | 417 | if (!entry) { |
96c2a876 AC |
418 | /* |
419 | * IDE legacy mode controller IRQs are magic. Why do compat | |
420 | * extensions always make such a nasty mess. | |
421 | */ | |
422 | if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && | |
423 | (dev->class & 0x05) == 0) | |
424 | return 0; | |
425 | } | |
5697b7ca | 426 | |
74f82af1 BH |
427 | if (entry) { |
428 | if (entry->link) | |
429 | gsi = acpi_pci_link_allocate_irq(entry->link, | |
430 | entry->index, | |
431 | &triggering, &polarity, | |
432 | &link); | |
433 | else | |
434 | gsi = entry->index; | |
435 | } else | |
5697b7ca BH |
436 | gsi = -1; |
437 | ||
1da177e4 LT |
438 | /* |
439 | * No IRQ known to the ACPI subsystem - maybe the BIOS / | |
440 | * driver reported one, then use it. Exit in any case. | |
441 | */ | |
c13f889a | 442 | if (gsi < 0) { |
c1aaae67 | 443 | if (acpi_isa_register_gsi(dev)) |
66fd3835 JP |
444 | dev_warn(&dev->dev, "PCI INT %c: no GSI\n", |
445 | pin_name(pin)); | |
181380b7 | 446 | |
b685f3b1 | 447 | kfree(entry); |
66fd3835 | 448 | return 0; |
4be44fcd | 449 | } |
1da177e4 | 450 | |
a2f809b0 | 451 | rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); |
349f0d56 | 452 | if (rc < 0) { |
c83642d5 | 453 | dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", |
cf68b80b | 454 | pin_name(pin)); |
181380b7 | 455 | kfree(entry); |
d550d98d | 456 | return rc; |
349f0d56 KK |
457 | } |
458 | dev->irq = rc; | |
1da177e4 | 459 | |
1da177e4 | 460 | if (link) |
c83642d5 BH |
461 | snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); |
462 | else | |
463 | link_desc[0] = '\0'; | |
1da177e4 | 464 | |
85b8582d VP |
465 | dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n", |
466 | pin_name(pin), link_desc, gsi, | |
467 | (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", | |
468 | (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); | |
1da177e4 | 469 | |
181380b7 | 470 | kfree(entry); |
d550d98d | 471 | return 0; |
1da177e4 | 472 | } |
1da177e4 | 473 | |
4be44fcd | 474 | void acpi_pci_irq_disable(struct pci_dev *dev) |
1da177e4 | 475 | { |
beba8a64 | 476 | struct acpi_prt_entry *entry; |
3f0f3c27 BH |
477 | int gsi; |
478 | u8 pin; | |
1da177e4 | 479 | |
8015a014 | 480 | pin = dev->pin; |
1da177e4 | 481 | if (!pin) |
d550d98d | 482 | return; |
1da177e4 | 483 | |
beba8a64 | 484 | entry = acpi_pci_irq_lookup(dev, pin); |
beba8a64 | 485 | if (!entry) |
d550d98d | 486 | return; |
1da177e4 | 487 | |
74f82af1 BH |
488 | if (entry->link) |
489 | gsi = acpi_pci_link_free_irq(entry->link); | |
490 | else | |
491 | gsi = entry->index; | |
beba8a64 | 492 | |
181380b7 YL |
493 | kfree(entry); |
494 | ||
1da177e4 LT |
495 | /* |
496 | * TBD: It might be worth clearing dev->irq by magic constant | |
497 | * (e.g. PCI_UNDEFINED_IRQ). | |
498 | */ | |
499 | ||
85b8582d | 500 | dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin)); |
1da177e4 | 501 | acpi_unregister_gsi(gsi); |
1da177e4 | 502 | } |