blob: 2652a614deebe8062c71bb4e3c7f26fe8d315a45 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 *
26 * TBD:
27 * 1. Support more than one IRQ resource entry per link device (index).
28 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
29 * for IRQ management (e.g. start()->_SRS).
30 */
31
Rafael J. Wysockic3146df2011-03-12 22:16:51 +010032#include <linux/syscore_ops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/spinlock.h>
38#include <linux/pm.h>
39#include <linux/pci.h>
Ingo Molnar36e43092006-04-27 05:25:00 -040040#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45
Len Browna192a952009-07-28 16:45:54 -040046#define PREFIX "ACPI: "
47
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070048#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050049ACPI_MODULE_NAME("pci_link");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
52#define ACPI_PCI_LINK_FILE_INFO "info"
53#define ACPI_PCI_LINK_FILE_STATUS "state"
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070054#define ACPI_PCI_LINK_MAX_POSSIBLE 16
55
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010056static int acpi_pci_link_add(struct acpi_device *device,
57 const struct acpi_device_id *not_used);
58static void acpi_pci_link_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Márton Némethc97adf92010-01-10 17:15:36 +010060static const struct acpi_device_id link_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020061 {"PNP0C0F", 0},
62 {"", 0},
63};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020064
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010065static struct acpi_scan_handler pci_link_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020066 .ids = link_device_ids,
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010067 .attach = acpi_pci_link_add,
68 .detach = acpi_pci_link_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -070069};
70
David Shaohua Li87bec662005-07-27 23:02:00 -040071/*
72 * If a link is initialized, we never change its active and initialized
73 * later even the link is disable. Instead, we just repick the active irq
74 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070075struct acpi_pci_link_irq {
Len Brown4be44fc2005-08-05 00:44:28 -040076 u8 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040077 u8 triggering; /* All IRQs */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070078 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040079 u8 resource_type;
80 u8 possible_count;
81 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
82 u8 initialized:1;
83 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
85
86struct acpi_pci_link {
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070087 struct list_head list;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070088 struct acpi_device *device;
89 struct acpi_pci_link_irq irq;
90 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091};
92
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070093static LIST_HEAD(acpi_link_list);
Adrian Bunke5685b92007-10-24 18:24:42 +020094static DEFINE_MUTEX(acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* --------------------------------------------------------------------------
97 PCI Link Device Management
98 -------------------------------------------------------------------------- */
99
100/*
101 * set context (link) possible list from resource list
102 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700103static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
104 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200106 struct acpi_pci_link *link = context;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700107 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Len Browneca008c2005-09-22 00:25:18 -0400109 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400110 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600111 case ACPI_RESOURCE_TYPE_END_TAG:
Patrick Mocheld550d982006-06-27 00:41:40 -0400112 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400113 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400114 {
115 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400116 if (!p || !p->interrupt_count) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600117 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
118 "Blank _PRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400119 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
Len Brown4be44fc2005-08-05 00:44:28 -0400121 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400122 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400123 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
124 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600125 printk(KERN_WARNING PREFIX
126 "Invalid _PRS IRQ %d\n",
127 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400128 continue;
129 }
130 link->irq.possible[i] = p->interrupts[i];
131 link->irq.possible_count++;
132 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400133 link->irq.triggering = p->triggering;
134 link->irq.polarity = p->polarity;
135 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400136 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400138 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400139 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400140 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400141 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400142 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400143 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600144 "Blank _PRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400145 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
Len Brown4be44fc2005-08-05 00:44:28 -0400147 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400148 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400149 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
150 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600151 printk(KERN_WARNING PREFIX
152 "Invalid _PRS IRQ %d\n",
153 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400154 continue;
155 }
156 link->irq.possible[i] = p->interrupts[i];
157 link->irq.possible_count++;
158 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400159 link->irq.triggering = p->triggering;
160 link->irq.polarity = p->polarity;
161 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400162 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600165 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
166 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400167 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
Patrick Mocheld550d982006-06-27 00:41:40 -0400170 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
Len Brown4be44fc2005-08-05 00:44:28 -0400173static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Len Brown4be44fc2005-08-05 00:44:28 -0400175 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Patrick Mochel67a71362006-05-19 16:54:42 -0400177 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400178 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400180 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400181 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
183
Len Brown4be44fc2005-08-05 00:44:28 -0400184 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
185 "Found %d possible IRQs\n",
186 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Patrick Mocheld550d982006-06-27 00:41:40 -0400188 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
190
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700191static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
192 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700194 int *irq = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Len Browneca008c2005-09-22 00:25:18 -0400196 switch (resource->type) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600197 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
198 case ACPI_RESOURCE_TYPE_END_TAG:
199 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400200 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400201 {
202 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400203 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400204 /*
205 * IRQ descriptors may have no IRQ# bits set,
206 * particularly those those w/ _STA disabled
207 */
208 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600209 "Blank _CRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400210 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400211 }
212 *irq = p->interrupts[0];
213 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400215 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400216 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400217 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400218 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400219 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400220 /*
221 * extended IRQ descriptors must
222 * return at least 1 IRQ
223 */
Len Browncece9292006-06-26 23:04:31 -0400224 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600225 "Blank _CRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400226 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400227 }
228 *irq = p->interrupts[0];
229 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500231 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600233 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
234 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400235 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600237
Patrick Mocheld550d982006-06-27 00:41:40 -0400238 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
241/*
242 * Run _CRS and set link->irq.active
243 *
244 * return value:
245 * 0 - success
246 * !0 - failure
247 */
Len Brown4be44fc2005-08-05 00:44:28 -0400248static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Len Brown4be44fc2005-08-05 00:44:28 -0400250 int result = 0;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700251 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400252 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 link->irq.active = 0;
255
256 /* in practice, status disabled is meaningless, ignore it */
257 if (acpi_strict) {
258 /* Query _STA, set link->device->status */
259 result = acpi_bus_get_status(link->device);
260 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400261 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 goto end;
263 }
264
265 if (!link->device->status.enabled) {
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400267 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
269 }
270
271 /*
272 * Query and parse _CRS to get the current IRQ assignment.
273 */
274
Patrick Mochel67a71362006-05-19 16:54:42 -0400275 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400276 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400278 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 result = -ENODEV;
280 goto end;
281 }
282
283 if (acpi_strict && !irq) {
Len Brown64684632006-06-26 23:41:38 -0400284 printk(KERN_ERR PREFIX "_CRS returned 0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 result = -ENODEV;
286 }
287
288 link->irq.active = irq;
289
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
291
Len Brown4be44fc2005-08-05 00:44:28 -0400292 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Len Brown4be44fc2005-08-05 00:44:28 -0400296static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700298 int result;
299 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400301 struct acpi_resource res;
302 struct acpi_resource end;
303 } *resource;
304 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Bjorn Helgaas6eca4b42009-02-17 14:00:50 -0700306 if (!irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400307 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Burman Yan36bcbec2006-12-19 12:56:11 -0800309 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400310 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400311 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Len Brown4be44fc2005-08-05 00:44:28 -0400313 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 buffer.pointer = resource;
315
Len Brown4be44fc2005-08-05 00:44:28 -0400316 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400317 case ACPI_RESOURCE_TYPE_IRQ:
318 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400320 resource->res.data.irq.triggering = link->irq.triggering;
321 resource->res.data.irq.polarity =
322 link->irq.polarity;
323 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
324 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400325 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400327 resource->res.data.irq.sharable = ACPI_SHARED;
328 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 resource->res.data.irq.interrupts[0] = irq;
330 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400331
Bob Moore50eca3e2005-09-30 19:03:00 -0400332 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
333 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400335 resource->res.data.extended_irq.producer_consumer =
336 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400337 resource->res.data.extended_irq.triggering =
338 link->irq.triggering;
339 resource->res.data.extended_irq.polarity =
340 link->irq.polarity;
341 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
342 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400343 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400345 resource->res.data.irq.sharable = ACPI_SHARED;
346 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 resource->res.data.extended_irq.interrupts[0] = irq;
348 /* ignore resource_source, it's optional */
349 break;
350 default:
Len Brown64684632006-06-26 23:41:38 -0400351 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 result = -EINVAL;
353 goto end;
354
355 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400356 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Yinghai Luf084dbb2013-03-23 19:16:37 +0000357 resource->end.length = sizeof(struct acpi_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400360 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 /* check for total failure */
363 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400364 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 result = -ENODEV;
366 goto end;
367 }
368
369 /* Query _STA, set device->status */
370 result = acpi_bus_get_status(link->device);
371 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400372 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 goto end;
374 }
375 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400376 printk(KERN_WARNING PREFIX
377 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400378 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400379 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
381
382 /* Query _CRS, set link->irq.active */
383 result = acpi_pci_link_get_current(link);
384 if (result) {
385 goto end;
386 }
387
388 /*
389 * Is current setting not what we set?
390 * set link->irq.active
391 */
392 if (link->irq.active != irq) {
393 /*
394 * policy: when _CRS doesn't return what we just _SRS
395 * assume _SRS worked and override _CRS value.
396 */
Len Browncece9292006-06-26 23:04:31 -0400397 printk(KERN_WARNING PREFIX
398 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400399 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400400 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 link->irq.active = irq;
402 }
403
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400405
406 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400408 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411/* --------------------------------------------------------------------------
412 PCI Link IRQ Management
413 -------------------------------------------------------------------------- */
414
415/*
416 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
417 * Link Devices to move the PIRQs around to minimize sharing.
418 *
419 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
420 * that the BIOS has already set to active. This is necessary because
421 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
422 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
423 * even if acpi_irq_nobalance is set.
424 *
425 * A tables of penalties avoids directing PCI interrupts to well known
426 * ISA IRQs. Boot params are available to over-ride the default table:
427 *
428 * List interrupts that are free for PCI use.
429 * acpi_irq_pci=n[,m]
430 *
431 * List interrupts that should not be used for PCI:
432 * acpi_irq_isa=n[,m]
433 *
434 * Note that PCI IRQ routers have a list of possible IRQs,
435 * which may not include the IRQs this table says are available.
436 *
437 * Since this heuristic can't tell the difference between a link
438 * that no device will attach to, vs. a link which may be shared
439 * by multiple active devices -- it is not optimal.
440 *
441 * If interrupt performance is that important, get an IO-APIC system
442 * with a pin dedicated to each device. Or for that matter, an MSI
443 * enabled system.
444 */
445
446#define ACPI_MAX_IRQS 256
447#define ACPI_MAX_ISA_IRQ 16
448
449#define PIRQ_PENALTY_PCI_AVAILABLE (0)
450#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
451#define PIRQ_PENALTY_PCI_USING (16*16*16)
452#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
453#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
454#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
455
456static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
457 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
458 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
459 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400460 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
461 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
466 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
467 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
468 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700469 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
470 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
471 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
472 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Len Brown4be44fc2005-08-05 00:44:28 -0400473 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474};
475
Len Brown4be44fc2005-08-05 00:44:28 -0400476int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700478 struct acpi_pci_link *link;
479 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 /*
482 * Update penalties to facilitate IRQ balancing.
483 */
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700484 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 /*
487 * reflect the possible and active irqs in the penalty table --
488 * useful for breaking ties.
489 */
490 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400491 int penalty =
492 PIRQ_PENALTY_PCI_POSSIBLE /
493 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 for (i = 0; i < link->irq.possible_count; i++) {
496 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
Len Brown4be44fc2005-08-05 00:44:28 -0400497 acpi_irq_penalty[link->irq.
498 possible[i]] +=
499 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501
502 } else if (link->irq.active) {
Len Brown4be44fc2005-08-05 00:44:28 -0400503 acpi_irq_penalty[link->irq.active] +=
504 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 }
506 }
507 /* Add a penalty for the SCI */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300508 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
Patrick Mocheld550d982006-06-27 00:41:40 -0400509 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
511
Bjorn Helgaas32836252008-11-05 16:17:52 -0700512static int acpi_irq_balance = -1; /* 0: static, 1: balance */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Len Brown4be44fc2005-08-05 00:44:28 -0400514static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Len Brown4be44fc2005-08-05 00:44:28 -0400516 int irq;
517 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
David Shaohua Li87bec662005-07-27 23:02:00 -0400519 if (link->irq.initialized) {
520 if (link->refcnt == 0)
521 /* This means the link is disabled but initialized */
522 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400523 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400524 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 /*
527 * search for active IRQ in list of possible IRQs.
528 */
529 for (i = 0; i < link->irq.possible_count; ++i) {
530 if (link->irq.active == link->irq.possible[i])
531 break;
532 }
533 /*
534 * forget active IRQ that is not in possible list
535 */
536 if (i == link->irq.possible_count) {
537 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400538 printk(KERN_WARNING PREFIX "_CRS %d not found"
539 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 link->irq.active = 0;
541 }
542
543 /*
544 * if active found, use it; else pick entry from end of possible list.
545 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700546 if (link->irq.active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 irq = link->irq.active;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700548 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 irq = link->irq.possible[link->irq.possible_count - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 if (acpi_irq_balance || !link->irq.active) {
552 /*
553 * Select the best IRQ. This is done in reverse to promote
554 * the use of IRQs 9, 10, 11, and >15.
555 */
556 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Len Brown4be44fc2005-08-05 00:44:28 -0400557 if (acpi_irq_penalty[irq] >
558 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 irq = link->irq.possible[i];
560 }
561 }
562
563 /* Attempt to enable the link device at this IRQ. */
564 if (acpi_pci_link_set(link, irq)) {
Len Brown64684632006-06-26 23:41:38 -0400565 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
566 "Try pci=noacpi or acpi=off\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400567 acpi_device_name(link->device),
Len Brown64684632006-06-26 23:41:38 -0400568 acpi_device_bid(link->device));
Patrick Mocheld550d982006-06-27 00:41:40 -0400569 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 } else {
571 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
Frank Seidel4d939152009-02-04 17:03:07 +0100572 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400573 acpi_device_name(link->device),
574 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
576
577 link->irq.initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400578 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
580
581/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400582 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 * success: return IRQ >= 0
584 * failure: return -1
585 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700586int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
587 int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700589 int result;
590 struct acpi_device *device;
591 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 result = acpi_bus_get_device(handle, &device);
594 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400595 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400596 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 }
598
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200599 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400601 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400602 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 }
604
605 /* TBD: Support multiple index (IRQ) entries per Link Device */
606 if (index) {
Len Brown64684632006-06-26 23:41:38 -0400607 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
Patrick Mocheld550d982006-06-27 00:41:40 -0400608 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 }
610
Ingo Molnar36e43092006-04-27 05:25:00 -0400611 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400612 if (acpi_pci_link_allocate(link)) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400613 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400614 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400615 }
Len Brown4be44fc2005-08-05 00:44:28 -0400616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (!link->irq.active) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400618 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400619 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400620 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
Len Brown4be44fc2005-08-05 00:44:28 -0400622 link->refcnt++;
Ingo Molnar36e43092006-04-27 05:25:00 -0400623 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Bob Moore50eca3e2005-09-30 19:03:00 -0400625 if (triggering)
626 *triggering = link->irq.triggering;
627 if (polarity)
628 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400629 if (name)
630 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400631 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400632 "Link %s is referenced\n",
633 acpi_device_bid(link->device)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400634 return (link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
David Shaohua Li87bec662005-07-27 23:02:00 -0400637/*
638 * We don't change link's irq information here. After it is reenabled, we
639 * continue use the info
640 */
Len Brown4be44fc2005-08-05 00:44:28 -0400641int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400642{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700643 struct acpi_device *device;
644 struct acpi_pci_link *link;
Len Brown4be44fc2005-08-05 00:44:28 -0400645 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
David Shaohua Li87bec662005-07-27 23:02:00 -0400647 result = acpi_bus_get_device(handle, &device);
648 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400649 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400650 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400651 }
652
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200653 link = acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400654 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400655 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400656 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400657 }
658
Ingo Molnar36e43092006-04-27 05:25:00 -0400659 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400660 if (!link->irq.initialized) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400661 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400662 printk(KERN_ERR PREFIX "Link isn't initialized\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400663 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400664 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400665#ifdef FUTURE_USE
666 /*
667 * The Link reference count allows us to _DISable an unused link
668 * and suspend time, and set it again on resume.
669 * However, 2.6.12 still has irq_router.resume
670 * which blindly restores the link state.
671 * So we disable the reference count method
672 * to prevent duplicate acpi_pci_link_set()
673 * which would harm some systems
674 */
Len Brown4be44fc2005-08-05 00:44:28 -0400675 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400676#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400677 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400678 "Link %s is dereferenced\n",
679 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400680
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700681 if (link->refcnt == 0)
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700682 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700683
Ingo Molnar36e43092006-04-27 05:25:00 -0400684 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400685 return (link->irq.active);
David Shaohua Li87bec662005-07-27 23:02:00 -0400686}
Len Brown4be44fc2005-08-05 00:44:28 -0400687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688/* --------------------------------------------------------------------------
689 Driver Interface
690 -------------------------------------------------------------------------- */
691
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100692static int acpi_pci_link_add(struct acpi_device *device,
693 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700695 int result;
696 struct acpi_pci_link *link;
697 int i;
Len Brown4be44fc2005-08-05 00:44:28 -0400698 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Burman Yan36bcbec2006-12-19 12:56:11 -0800700 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400702 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 link->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
706 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700707 device->driver_data = link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Ingo Molnar36e43092006-04-27 05:25:00 -0400709 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 result = acpi_pci_link_get_possible(link);
711 if (result)
712 goto end;
713
714 /* query and set link->irq.active */
715 acpi_pci_link_get_current(link);
716
Dan Aloni0dc070b2007-07-09 11:33:18 -0700717 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400718 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 for (i = 0; i < link->irq.possible_count; i++) {
720 if (link->irq.active == link->irq.possible[i]) {
Kay Sieversbe964472012-05-08 17:24:20 +0200721 printk(KERN_CONT " *%d", link->irq.possible[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400723 } else
Kay Sieversbe964472012-05-08 17:24:20 +0200724 printk(KERN_CONT " %d", link->irq.possible[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 }
726
Kay Sieversbe964472012-05-08 17:24:20 +0200727 printk(KERN_CONT ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 if (!found)
Kay Sieversbe964472012-05-08 17:24:20 +0200730 printk(KERN_CONT " *%d", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Len Brown4be44fc2005-08-05 00:44:28 -0400732 if (!link->device->status.enabled)
Kay Sieversbe964472012-05-08 17:24:20 +0200733 printk(KERN_CONT ", disabled.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Kay Sieversbe964472012-05-08 17:24:20 +0200735 printk(KERN_CONT "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700737 list_add_tail(&link->list, &acpi_link_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Len Brown4be44fc2005-08-05 00:44:28 -0400739 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 /* disable all links -- to be activated on use */
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700741 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
Ingo Molnar36e43092006-04-27 05:25:00 -0400742 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 if (result)
745 kfree(link);
746
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100747 return result < 0 ? result : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
Len Brown4be44fc2005-08-05 00:44:28 -0400750static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700751{
Linus Torvalds697a2d62005-08-01 12:37:54 -0700752 if (link->refcnt && link->irq.active && link->irq.initialized)
Patrick Mocheld550d982006-06-27 00:41:40 -0400753 return (acpi_pci_link_set(link, link->irq.active));
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700754
755 return 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700756}
757
Rafael J. Wysockic3146df2011-03-12 22:16:51 +0100758static void irqrouter_resume(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700760 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700762 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds697a2d62005-08-01 12:37:54 -0700763 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}
766
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100767static void acpi_pci_link_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700769 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200771 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Ingo Molnar36e43092006-04-27 05:25:00 -0400773 mutex_lock(&acpi_link_lock);
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700774 list_del(&link->list);
Ingo Molnar36e43092006-04-27 05:25:00 -0400775 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779
780/*
781 * modify acpi_irq_penalty[] from cmdline
782 */
783static int __init acpi_irq_penalty_update(char *str, int used)
784{
785 int i;
786
787 for (i = 0; i < 16; i++) {
788 int retval;
789 int irq;
790
Len Brown4be44fc2005-08-05 00:44:28 -0400791 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 if (!retval)
794 break; /* no number found */
795
796 if (irq < 0)
797 continue;
Len Brown4be44fc2005-08-05 00:44:28 -0400798
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600799 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 continue;
801
802 if (used)
803 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
804 else
805 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
806
807 if (retval != 2) /* no next number */
808 break;
809 }
810 return 1;
811}
812
813/*
814 * We'd like PNP to call this routine for the
815 * single ISA_USED value for each legacy device.
816 * But instead it calls us with each POSSIBLE setting.
817 * There is no ISA_POSSIBLE weight, so we simply use
818 * the (small) PCI_USING penalty.
819 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500820void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821{
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600822 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
823 if (active)
824 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
825 else
826 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828}
829
830/*
831 * Over-ride default table to reserve additional IRQs for use by ISA
832 * e.g. acpi_irq_isa=5
833 * Useful for telling ACPI how not to interfere with your ISA sound card.
834 */
835static int __init acpi_irq_isa(char *str)
836{
837 return acpi_irq_penalty_update(str, 1);
838}
Len Brown4be44fc2005-08-05 00:44:28 -0400839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840__setup("acpi_irq_isa=", acpi_irq_isa);
841
842/*
843 * Over-ride default table to free additional IRQs for use by PCI
844 * e.g. acpi_irq_pci=7,15
845 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
846 */
847static int __init acpi_irq_pci(char *str)
848{
849 return acpi_irq_penalty_update(str, 0);
850}
Len Brown4be44fc2005-08-05 00:44:28 -0400851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852__setup("acpi_irq_pci=", acpi_irq_pci);
853
854static int __init acpi_irq_nobalance_set(char *str)
855{
856 acpi_irq_balance = 0;
857 return 1;
858}
Len Brown4be44fc2005-08-05 00:44:28 -0400859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
861
Roel Kluin8a383ef2008-12-09 20:45:30 +0100862static int __init acpi_irq_balance_set(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863{
864 acpi_irq_balance = 1;
865 return 1;
866}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Len Brown4be44fc2005-08-05 00:44:28 -0400868__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Rafael J. Wysockic3146df2011-03-12 22:16:51 +0100870static struct syscore_ops irqrouter_syscore_ops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400871 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872};
873
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100874void __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 if (acpi_noirq)
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100877 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Bjorn Helgaas32836252008-11-05 16:17:52 -0700879 if (acpi_irq_balance == -1) {
880 /* no command line switch: enable balancing in IOAPIC mode */
881 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
882 acpi_irq_balance = 1;
883 else
884 acpi_irq_balance = 0;
885 }
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100886 register_syscore_ops(&irqrouter_syscore_ops);
887 acpi_scan_add_handler(&pci_link_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888}