blob: c96887d5289eaed997e29eaab738f8bb4bb488ee [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Bjorn Helgaas39488b02008-12-08 21:31:42 -07007 * (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
8 * Bjorn Helgaas <bjorn.helgaas@hp.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070030#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/spinlock.h>
36#include <linux/pm.h>
37#include <linux/pci.h>
38#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Len Browna192a952009-07-28 16:45:54 -040041#define PREFIX "ACPI: "
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050044ACPI_MODULE_NAME("pci_irq");
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070046struct acpi_prt_entry {
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -070047 struct list_head list;
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070048 struct acpi_pci_id id;
49 u8 pin;
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -070050 acpi_handle link;
51 u32 index; /* GSI, or link _CRS index */
Bjorn Helgaasf748baf2008-12-08 21:30:31 -070052};
53
Bjorn Helgaascf68b802008-12-08 21:30:36 -070054static inline char pin_name(int pin)
55{
Bjorn Helgaase64e9db2008-12-08 21:30:41 -070056 return 'A' + pin - 1;
Bjorn Helgaascf68b802008-12-08 21:30:36 -070057}
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/* --------------------------------------------------------------------------
60 PCI IRQ Routing Table (PRT) Support
61 -------------------------------------------------------------------------- */
62
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070063/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000064static const struct dmi_system_id medion_md9580[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070065 {
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 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000076static const struct dmi_system_id dell_optiplex[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070077 {
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 */
Jan Beulich609d4bc2009-03-12 11:58:25 +000088static const struct dmi_system_id hp_t5710[] = {
Bjorn Helgaas391df5d2008-03-11 13:45:15 -070089 {
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
100struct prt_quirk {
Jan Beulich609d4bc2009-03-12 11:58:25 +0000101 const struct dmi_system_id *system;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700102 unsigned int segment;
103 unsigned int bus;
104 unsigned int device;
105 unsigned char pin;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000106 const char *source; /* according to BIOS */
107 const char *actual_source;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700108};
109
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700110#define PCI_INTX_PIN(c) (c - 'A' + 1)
111
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700112/*
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 */
Jan Beulich609d4bc2009-03-12 11:58:25 +0000117static const struct prt_quirk prt_quirks[] = {
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700118 { medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
Bjorn Helgaasb97d4802008-03-25 11:21:11 -0600119 "\\_SB_.PCI0.ISA_.LNKA",
120 "\\_SB_.PCI0.ISA_.LNKB"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700121 { dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700122 "\\_SB_.LNKB",
123 "\\_SB_.LNKA"},
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700124 { hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700125 "\\_SB_.PCI0.LNK1",
126 "\\_SB_.PCI0.LNK3"},
127};
128
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700129static void do_prt_fixups(struct acpi_prt_entry *entry,
130 struct acpi_pci_routing_table *prt)
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700131{
132 int i;
Jan Beulich609d4bc2009-03-12 11:58:25 +0000133 const struct prt_quirk *quirk;
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700134
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 &&
Bjorn Helgaasc4580332008-12-08 21:30:46 -0700146 entry->pin == quirk->pin &&
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700147 !strcmp(prt->source, quirk->source) &&
148 strlen(prt->source) >= strlen(quirk->actual_source)) {
149 printk(KERN_WARNING PREFIX "firmware reports "
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600150 "%04x:%02x:%02x PCI INT %c connected to %s; "
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700151 "changing to %s\n",
152 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700153 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700154 prt->source, quirk->actual_source);
155 strcpy(prt->source, quirk->actual_source);
156 }
157 }
158}
159
Yinghai Lu181380b2013-02-16 11:58:34 -0700160static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Yinghai Lu181380b2013-02-16 11:58:34 -0700164 int segment = pci_domain_nr(dev->bus);
165 int bus = dev->bus->number;
166 int device = PCI_SLOT(dev->devfn);
Bjorn Helgaas3604a9f2008-12-08 21:31:21 -0700167 struct acpi_prt_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Yinghai Lu181380b2013-02-16 11:58:34 -0700169 if (((prt->address >> 16) & 0xffff) != device ||
170 prt->pin + 1 != pin)
171 return -ENODEV;
172
Burman Yan36bcbec2006-12-19 12:56:11 -0800173 entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400175 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700177 /*
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 */
Bjorn Helgaas79c44122012-10-30 15:24:06 +0900182 entry->id.segment = segment;
183 entry->id.bus = bus;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 entry->id.device = (prt->address >> 16) & 0xFFFF;
Bjorn Helgaase64e9db2008-12-08 21:30:41 -0700185 entry->pin = prt->pin + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Bjorn Helgaas391df5d2008-03-11 13:45:15 -0700187 do_prt_fixups(entry, prt);
188
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700189 entry->index = prt->source_index;
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 /*
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 */
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700204 if (prt->source[0])
205 acpi_get_handle(handle, prt->source, &entry->link);
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 /*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
Bjorn Helgaas21a53282008-12-08 21:30:05 -0700216 " %04x:%02x:%02x[%c] -> %s[%d]\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400217 entry->id.segment, entry->id.bus,
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700218 entry->id.device, pin_name(entry->pin),
Bjorn Helgaas4eaf6db2008-12-08 21:31:27 -0700219 prt->source, entry->index));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Yinghai Lu181380b2013-02-16 11:58:34 -0700221 *entry_ptr = entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Patrick Mocheld550d982006-06-27 00:41:40 -0400223 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Yinghai Lu181380b2013-02-16 11:58:34 -0700226static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
227 int pin, struct acpi_prt_entry **entry_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700229 acpi_status status;
230 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
231 struct acpi_pci_routing_table *entry;
Yinghai Lu181380b2013-02-16 11:58:34 -0700232 acpi_handle handle = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Yinghai Lu181380b2013-02-16 11:58:34 -0700234 if (dev->bus->bridge)
235 handle = ACPI_HANDLE(dev->bus->bridge);
236
237 if (!handle)
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700238 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Yinghai Lu181380b2013-02-16 11:58:34 -0700240 /* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 status = acpi_get_irq_routing_table(handle, &buffer);
242 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400244 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 }
246
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700247 entry = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 while (entry && (entry->length > 0)) {
Yinghai Lu181380b2013-02-16 11:58:34 -0700249 if (!acpi_pci_irq_check_entry(handle, dev, pin,
250 entry, entry_ptr))
251 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 entry = (struct acpi_pci_routing_table *)
Len Brown4be44fc2005-08-05 00:44:28 -0400253 ((unsigned long)entry + entry->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 }
255
Bjorn Helgaas2320ac62008-12-08 21:30:15 -0700256 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -0400257 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260/* --------------------------------------------------------------------------
261 PCI Interrupt Routing Support
262 -------------------------------------------------------------------------- */
Stefan Assmannd7f61692011-07-15 14:52:30 +0200263#ifdef CONFIG_X86_IO_APIC
264extern int noioapicquirk;
265extern int noioapicreroute;
266
267static 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 */
287static 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
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700318static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Yinghai Lu181380b2013-02-16 11:58:34 -0700320 struct acpi_prt_entry *entry = NULL;
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700321 struct pci_dev *bridge;
322 u8 bridge_pin, orig_pin = pin;
Yinghai Lu181380b2013-02-16 11:58:34 -0700323 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Yinghai Lu181380b2013-02-16 11:58:34 -0700325 ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
326 if (!ret && entry) {
Stefan Assmannd7f61692011-07-15 14:52:30 +0200327#ifdef CONFIG_X86_IO_APIC
328 acpi_reroute_boot_interrupt(dev, entry);
329#endif /* CONFIG_X86_IO_APIC */
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700330 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
Bjorn Helgaas13504872008-12-08 21:30:56 -0700331 pci_name(dev), pin_name(pin)));
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700332 return entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
Len Brown4be44fc2005-08-05 00:44:28 -0400334
Yinghai Lu181380b2013-02-16 11:58:34 -0700335 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 * 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 */
Bjorn Helgaasee401362008-12-08 21:31:11 -0700339 bridge = dev->bus->self;
340 while (bridge) {
Bjorn Helgaasc686d142009-02-17 13:49:10 -0700341 pin = pci_swizzle_interrupt_pin(dev, pin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
344 /* PC card has the same IRQ as its cardbridge */
Kristen Accardi8015a012005-11-02 16:24:35 -0800345 bridge_pin = bridge->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (!bridge_pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400347 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
348 "No interrupt pin configured for device %s\n",
349 pci_name(bridge)));
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700350 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 pin = bridge_pin;
353 }
354
Yinghai Lu181380b2013-02-16 11:58:34 -0700355 ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
356 if (!ret && entry) {
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700357 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 }
Bjorn Helgaasee401362008-12-08 21:31:11 -0700363
364 dev = bridge;
365 bridge = dev->bus->self;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
367
Bjorn Helgaas3b1ea182008-12-08 21:31:06 -0700368 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
369 pin_name(orig_pin));
370 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
Tomasz Nowickic1aaae62014-02-20 14:27:46 +0100373#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
374static 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
391static inline int acpi_isa_register_gsi(struct pci_dev *dev)
392{
393 return -ENODEV;
394}
395#endif
396
Len Brown4be44fc2005-08-05 00:44:28 -0400397int acpi_pci_irq_enable(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700399 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700400 int gsi;
401 u8 pin;
Bob Moore50eca3e2005-09-30 19:03:00 -0400402 int triggering = ACPI_LEVEL_SENSITIVE;
403 int polarity = ACPI_ACTIVE_LOW;
Len Brown4be44fc2005-08-05 00:44:28 -0400404 char *link = NULL;
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600405 char link_desc[16];
Len Brown4be44fc2005-08-05 00:44:28 -0400406 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Kristen Accardi8015a012005-11-02 16:24:35 -0800408 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 if (!pin) {
Len Brown4be44fc2005-08-05 00:44:28 -0400410 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
411 "No interrupt pin configured for device %s\n",
412 pci_name(dev)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400413 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700416 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700417 if (!entry) {
Alan Cox96c2a872008-01-10 22:49:58 -0500418 /*
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 }
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700426
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700427 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
Bjorn Helgaas5697b7c2008-12-08 21:31:16 -0700436 gsi = -1;
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /*
439 * No IRQ known to the ACPI subsystem - maybe the BIOS /
440 * driver reported one, then use it. Exit in any case.
441 */
Bjorn Helgaasc13f8892008-12-08 21:30:26 -0700442 if (gsi < 0) {
Tomasz Nowickic1aaae62014-02-20 14:27:46 +0100443 if (acpi_isa_register_gsi(dev))
Joe Perches66fd3832012-11-21 13:46:04 +0000444 dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
445 pin_name(pin));
Yinghai Lu181380b2013-02-16 11:58:34 -0700446
Tomasz Nowickib685f3b2014-02-10 14:00:11 +0100447 kfree(entry);
Joe Perches66fd3832012-11-21 13:46:04 +0000448 return 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400449 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
Yinghai Lua2f809b2009-04-27 18:01:20 -0700451 rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400452 if (rc < 0) {
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600453 dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
Bjorn Helgaascf68b802008-12-08 21:30:36 -0700454 pin_name(pin));
Yinghai Lu181380b2013-02-16 11:58:34 -0700455 kfree(entry);
Patrick Mocheld550d982006-06-27 00:41:40 -0400456 return rc;
Kenji Kaneshige349f0d52005-07-28 14:42:00 -0400457 }
458 dev->irq = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 if (link)
Bjorn Helgaasc83642d2008-06-27 08:45:39 -0600461 snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
462 else
463 link_desc[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Vincent Palatin85b85822011-12-05 11:51:18 -0800465 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Yinghai Lu181380b2013-02-16 11:58:34 -0700470 kfree(entry);
Patrick Mocheld550d982006-06-27 00:41:40 -0400471 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472}
Len Brown4be44fc2005-08-05 00:44:28 -0400473
Len Brown4be44fc2005-08-05 00:44:28 -0400474void acpi_pci_irq_disable(struct pci_dev *dev)
475{
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700476 struct acpi_prt_entry *entry;
Bjorn Helgaas3f0f3c22008-12-08 21:31:37 -0700477 int gsi;
478 u8 pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Kristen Accardi8015a012005-11-02 16:24:35 -0800480 pin = dev->pin;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (!pin)
Patrick Mocheld550d982006-06-27 00:41:40 -0400482 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Jiang Liu3eec5952014-08-08 14:07:51 +0800484 /* Keep IOAPIC pin configuration when suspending */
485 if (dev->dev.power.is_prepared)
486 return;
487
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700488 entry = acpi_pci_irq_lookup(dev, pin);
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700489 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Bjorn Helgaas74f82af2008-12-08 21:31:32 -0700492 if (entry->link)
493 gsi = acpi_pci_link_free_irq(entry->link);
494 else
495 gsi = entry->index;
Bjorn Helgaasbeba8a62008-12-08 21:31:01 -0700496
Yinghai Lu181380b2013-02-16 11:58:34 -0700497 kfree(entry);
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 /*
500 * TBD: It might be worth clearing dev->irq by magic constant
501 * (e.g. PCI_UNDEFINED_IRQ).
502 */
503
Vincent Palatin85b85822011-12-05 11:51:18 -0800504 dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
Jiang Liu6a38fa02014-06-10 14:16:27 +0800505 if (gsi >= 0 && dev->irq > 0)
506 acpi_unregister_gsi(gsi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}