blob: 606da5d77ad32aee516a7eea39a8eaabacdc1e42 [file] [log] [blame]
Thomas Gleixnerc942fdd2019-05-27 08:55:06 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * TBD:
10 * 1. Support more than one IRQ resource entry per link device (index).
11 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
12 * for IRQ management (e.g. start()->_SRS).
13 */
14
Rafael J. Wysockic3146df22011-03-12 22:16:51 +010015#include <linux/syscore_ops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/spinlock.h>
21#include <linux/pm.h>
22#include <linux/pci.h>
Ingo Molnar36e43092006-04-27 05:25:00 -040023#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Lv Zheng8b484632013-12-03 08:49:16 +080025#include <linux/acpi.h>
Sinan Kaya103544d2016-04-17 13:36:53 -040026#include <linux/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Rashikac071b6042013-12-17 14:58:31 +053028#include "internal.h"
29
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070030#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050031ACPI_MODULE_NAME("pci_link");
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070034#define ACPI_PCI_LINK_MAX_POSSIBLE 16
35
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010036static int acpi_pci_link_add(struct acpi_device *device,
37 const struct acpi_device_id *not_used);
38static void acpi_pci_link_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Márton Némethc97adf92010-01-10 17:15:36 +010040static const struct acpi_device_id link_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020041 {"PNP0C0F", 0},
42 {"", 0},
43};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020044
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010045static struct acpi_scan_handler pci_link_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020046 .ids = link_device_ids,
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010047 .attach = acpi_pci_link_add,
48 .detach = acpi_pci_link_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049};
50
David Shaohua Li87bec662005-07-27 23:02:00 -040051/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055struct acpi_pci_link_irq {
Sinan Kaya37c59392015-12-09 11:18:28 -050056 u32 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040057 u8 triggering; /* All IRQs */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070058 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040059 u8 resource_type;
60 u8 possible_count;
Sinan Kaya37c59392015-12-09 11:18:28 -050061 u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
Len Brown4be44fc2005-08-05 00:44:28 -040062 u8 initialized:1;
63 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064};
65
66struct acpi_pci_link {
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070067 struct list_head list;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070068 struct acpi_device *device;
69 struct acpi_pci_link_irq irq;
70 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070073static LIST_HEAD(acpi_link_list);
Adrian Bunke5685b92007-10-24 18:24:42 +020074static DEFINE_MUTEX(acpi_link_lock);
Sinan Kayaf1caa612016-10-24 00:31:31 -040075static int sci_irq = -1, sci_penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077/* --------------------------------------------------------------------------
78 PCI Link Device Management
79 -------------------------------------------------------------------------- */
80
81/*
82 * set context (link) possible list from resource list
83 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070084static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
85 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Jan Engelhardt50dd0962006-10-01 00:28:50 +020087 struct acpi_pci_link *link = context;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -070088 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Len Browneca008c2005-09-22 00:25:18 -040090 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -040091 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -060092 case ACPI_RESOURCE_TYPE_END_TAG:
Patrick Mocheld550d982006-06-27 00:41:40 -040093 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -040094 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -040095 {
96 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -040097 if (!p || !p->interrupt_count) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -060098 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
99 "Blank _PRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400100 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 }
Len Brown4be44fc2005-08-05 00:44:28 -0400102 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400103 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400104 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
105 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600106 printk(KERN_WARNING PREFIX
107 "Invalid _PRS IRQ %d\n",
108 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400109 continue;
110 }
111 link->irq.possible[i] = p->interrupts[i];
112 link->irq.possible_count++;
113 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400114 link->irq.triggering = p->triggering;
115 link->irq.polarity = p->polarity;
116 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400117 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400119 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400120 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400121 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400122 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400123 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400124 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600125 "Blank _PRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400126 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
Len Brown4be44fc2005-08-05 00:44:28 -0400128 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400129 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400130 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
131 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600132 printk(KERN_WARNING PREFIX
133 "Invalid _PRS IRQ %d\n",
134 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400135 continue;
136 }
137 link->irq.possible[i] = p->interrupts[i];
138 link->irq.possible_count++;
139 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400140 link->irq.triggering = p->triggering;
141 link->irq.polarity = p->polarity;
142 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400143 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600146 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
147 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400148 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150
Patrick Mocheld550d982006-06-27 00:41:40 -0400151 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Len Brown4be44fc2005-08-05 00:44:28 -0400154static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Len Brown4be44fc2005-08-05 00:44:28 -0400156 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Patrick Mochel67a71362006-05-19 16:54:42 -0400158 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400159 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (ACPI_FAILURE(status)) {
Alex Hung92d1b382018-02-22 21:43:44 -0800161 acpi_handle_debug(link->device->handle, "_PRS not present or invalid");
162 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164
Len Brown4be44fc2005-08-05 00:44:28 -0400165 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
166 "Found %d possible IRQs\n",
167 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Patrick Mocheld550d982006-06-27 00:41:40 -0400169 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700172static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
173 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700175 int *irq = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Len Browneca008c2005-09-22 00:25:18 -0400177 switch (resource->type) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600178 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
179 case ACPI_RESOURCE_TYPE_END_TAG:
180 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400181 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400182 {
183 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400184 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400185 /*
186 * IRQ descriptors may have no IRQ# bits set,
187 * particularly those those w/ _STA disabled
188 */
189 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600190 "Blank _CRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400191 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400192 }
193 *irq = p->interrupts[0];
194 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400196 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400197 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400198 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400199 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400200 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400201 /*
202 * extended IRQ descriptors must
203 * return at least 1 IRQ
204 */
Len Browncece9292006-06-26 23:04:31 -0400205 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600206 "Blank _CRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400207 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400208 }
209 *irq = p->interrupts[0];
210 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500212 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600214 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
215 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400216 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600218
Patrick Mocheld550d982006-06-27 00:41:40 -0400219 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
222/*
223 * Run _CRS and set link->irq.active
224 *
225 * return value:
226 * 0 - success
227 * !0 - failure
228 */
Len Brown4be44fc2005-08-05 00:44:28 -0400229static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Len Brown4be44fc2005-08-05 00:44:28 -0400231 int result = 0;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700232 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400233 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 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) {
Len Brown64684632006-06-26 23:41:38 -0400242 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 goto end;
244 }
245
246 if (!link->device->status.enabled) {
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400248 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
250 }
251
252 /*
253 * Query and parse _CRS to get the current IRQ assignment.
254 */
255
Patrick Mochel67a71362006-05-19 16:54:42 -0400256 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400257 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400259 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 result = -ENODEV;
261 goto end;
262 }
263
264 if (acpi_strict && !irq) {
Len Brown64684632006-06-26 23:41:38 -0400265 printk(KERN_ERR PREFIX "_CRS returned 0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 result = -ENODEV;
267 }
268
269 link->irq.active = irq;
270
271 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
272
Len Brown4be44fc2005-08-05 00:44:28 -0400273 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400274 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
Len Brown4be44fc2005-08-05 00:44:28 -0400277static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700279 int result;
280 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400282 struct acpi_resource res;
283 struct acpi_resource end;
284 } *resource;
285 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Bjorn Helgaas6eca4b42009-02-17 14:00:50 -0700287 if (!irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400288 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Burman Yan36bcbec2006-12-19 12:56:11 -0800290 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400291 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400292 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Len Brown4be44fc2005-08-05 00:44:28 -0400294 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 buffer.pointer = resource;
296
Len Brown4be44fc2005-08-05 00:44:28 -0400297 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400298 case ACPI_RESOURCE_TYPE_IRQ:
299 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400301 resource->res.data.irq.triggering = link->irq.triggering;
302 resource->res.data.irq.polarity =
303 link->irq.polarity;
304 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
Erik Schmaussc163f90c2019-02-15 13:36:19 -0800305 resource->res.data.irq.shareable =
Len Brown4be44fc2005-08-05 00:44:28 -0400306 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 else
Erik Schmaussc163f90c2019-02-15 13:36:19 -0800308 resource->res.data.irq.shareable = ACPI_SHARED;
Bob Moore50eca3e2005-09-30 19:03:00 -0400309 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 resource->res.data.irq.interrupts[0] = irq;
311 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400312
Bob Moore50eca3e2005-09-30 19:03:00 -0400313 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
314 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400316 resource->res.data.extended_irq.producer_consumer =
317 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400318 resource->res.data.extended_irq.triggering =
319 link->irq.triggering;
320 resource->res.data.extended_irq.polarity =
321 link->irq.polarity;
322 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
Hans de Goede1c5e1cd2020-04-13 15:09:49 +0200323 resource->res.data.extended_irq.shareable =
Len Brown4be44fc2005-08-05 00:44:28 -0400324 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 else
Hans de Goede1c5e1cd2020-04-13 15:09:49 +0200326 resource->res.data.extended_irq.shareable = ACPI_SHARED;
Bob Moore50eca3e2005-09-30 19:03:00 -0400327 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 resource->res.data.extended_irq.interrupts[0] = irq;
329 /* ignore resource_source, it's optional */
330 break;
331 default:
Len Brown64684632006-06-26 23:41:38 -0400332 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 result = -EINVAL;
334 goto end;
335
336 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400337 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Yinghai Luf084dbb2013-03-23 19:16:37 +0000338 resource->end.length = sizeof(struct acpi_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400341 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 /* check for total failure */
344 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400345 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 result = -ENODEV;
347 goto end;
348 }
349
350 /* Query _STA, set device->status */
351 result = acpi_bus_get_status(link->device);
352 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400353 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 goto end;
355 }
356 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400357 printk(KERN_WARNING PREFIX
358 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400359 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400360 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
362
363 /* Query _CRS, set link->irq.active */
364 result = acpi_pci_link_get_current(link);
365 if (result) {
366 goto end;
367 }
368
369 /*
370 * Is current setting not what we set?
371 * set link->irq.active
372 */
373 if (link->irq.active != irq) {
374 /*
375 * policy: when _CRS doesn't return what we just _SRS
376 * assume _SRS worked and override _CRS value.
377 */
Len Browncece9292006-06-26 23:04:31 -0400378 printk(KERN_WARNING PREFIX
379 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400380 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400381 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 link->irq.active = irq;
383 }
384
385 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400386
387 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400389 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392/* --------------------------------------------------------------------------
393 PCI Link IRQ Management
394 -------------------------------------------------------------------------- */
395
396/*
397 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
398 * Link Devices to move the PIRQs around to minimize sharing.
399 *
400 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
401 * that the BIOS has already set to active. This is necessary because
402 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
403 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
404 * even if acpi_irq_nobalance is set.
405 *
406 * A tables of penalties avoids directing PCI interrupts to well known
407 * ISA IRQs. Boot params are available to over-ride the default table:
408 *
409 * List interrupts that are free for PCI use.
410 * acpi_irq_pci=n[,m]
411 *
412 * List interrupts that should not be used for PCI:
413 * acpi_irq_isa=n[,m]
414 *
415 * Note that PCI IRQ routers have a list of possible IRQs,
416 * which may not include the IRQs this table says are available.
417 *
418 * Since this heuristic can't tell the difference between a link
419 * that no device will attach to, vs. a link which may be shared
420 * by multiple active devices -- it is not optimal.
421 *
422 * If interrupt performance is that important, get an IO-APIC system
423 * with a pin dedicated to each device. Or for that matter, an MSI
424 * enabled system.
425 */
426
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400427#define ACPI_MAX_ISA_IRQS 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
430#define PIRQ_PENALTY_PCI_USING (16*16*16)
431#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
432#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
433#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
434
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400435static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
437 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
438 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400439 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
440 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
442 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
443 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
444 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
Sinan Kaya103544d2016-04-17 13:36:53 -0400445 0, /* IRQ9 PCI, often acpi */
446 0, /* IRQ10 PCI */
447 0, /* IRQ11 PCI */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700448 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
449 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
450 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
451 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100452 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453};
454
Sinan Kaya103544d2016-04-17 13:36:53 -0400455static int acpi_irq_pci_sharing_penalty(int irq)
456{
457 struct acpi_pci_link *link;
458 int penalty = 0;
Sinan Kaya4a6e68b2016-06-29 04:27:35 -0400459 int i;
Sinan Kaya103544d2016-04-17 13:36:53 -0400460
461 list_for_each_entry(link, &acpi_link_list, list) {
462 /*
463 * If a link is active, penalize its IRQ heavily
464 * so we try to choose a different IRQ.
465 */
466 if (link->irq.active && link->irq.active == irq)
467 penalty += PIRQ_PENALTY_PCI_USING;
Sinan Kaya103544d2016-04-17 13:36:53 -0400468
Sinan Kaya4a6e68b2016-06-29 04:27:35 -0400469 /*
470 * penalize the IRQs PCI might use, but not as severely.
471 */
472 for (i = 0; i < link->irq.possible_count; i++)
473 if (link->irq.possible[i] == irq)
474 penalty += PIRQ_PENALTY_PCI_POSSIBLE /
475 link->irq.possible_count;
Sinan Kaya103544d2016-04-17 13:36:53 -0400476 }
477
478 return penalty;
479}
480
481static int acpi_irq_get_penalty(int irq)
482{
483 int penalty = 0;
484
Sinan Kayaf1caa612016-10-24 00:31:31 -0400485 if (irq == sci_irq)
486 penalty += sci_penalty;
Sinan Kaya103544d2016-04-17 13:36:53 -0400487
Sinan Kayaf7eca372016-06-29 04:27:37 -0400488 if (irq < ACPI_MAX_ISA_IRQS)
489 return penalty + acpi_isa_irq_penalty[irq];
490
Sinan Kayaf1caa612016-10-24 00:31:31 -0400491 return penalty + acpi_irq_pci_sharing_penalty(irq);
Sinan Kaya103544d2016-04-17 13:36:53 -0400492}
493
Sinan Kaya487cf9172016-06-29 04:27:36 -0400494int __init acpi_irq_penalty_init(void)
495{
496 struct acpi_pci_link *link;
497 int i;
498
499 /*
500 * Update penalties to facilitate IRQ balancing.
501 */
502 list_for_each_entry(link, &acpi_link_list, list) {
503
504 /*
505 * reflect the possible and active irqs in the penalty table --
506 * useful for breaking ties.
507 */
508 if (link->irq.possible_count) {
509 int penalty =
510 PIRQ_PENALTY_PCI_POSSIBLE /
511 link->irq.possible_count;
512
513 for (i = 0; i < link->irq.possible_count; i++) {
514 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS)
515 acpi_isa_irq_penalty[link->irq.
516 possible[i]] +=
517 penalty;
518 }
519
520 } else if (link->irq.active &&
521 (link->irq.active < ACPI_MAX_ISA_IRQS)) {
522 acpi_isa_irq_penalty[link->irq.active] +=
523 PIRQ_PENALTY_PCI_POSSIBLE;
524 }
525 }
526
527 return 0;
528}
529
Bjorn Helgaas32836252008-11-05 16:17:52 -0700530static int acpi_irq_balance = -1; /* 0: static, 1: balance */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Len Brown4be44fc2005-08-05 00:44:28 -0400532static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533{
Len Brown4be44fc2005-08-05 00:44:28 -0400534 int irq;
535 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
David Shaohua Li87bec662005-07-27 23:02:00 -0400537 if (link->irq.initialized) {
538 if (link->refcnt == 0)
539 /* This means the link is disabled but initialized */
540 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400541 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 /*
545 * search for active IRQ in list of possible IRQs.
546 */
547 for (i = 0; i < link->irq.possible_count; ++i) {
548 if (link->irq.active == link->irq.possible[i])
549 break;
550 }
551 /*
552 * forget active IRQ that is not in possible list
553 */
554 if (i == link->irq.possible_count) {
555 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400556 printk(KERN_WARNING PREFIX "_CRS %d not found"
557 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 link->irq.active = 0;
559 }
560
561 /*
562 * if active found, use it; else pick entry from end of possible list.
563 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700564 if (link->irq.active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 irq = link->irq.active;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700566 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 irq = link->irq.possible[link->irq.possible_count - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
569 if (acpi_irq_balance || !link->irq.active) {
570 /*
571 * Select the best IRQ. This is done in reverse to promote
572 * the use of IRQs 9, 10, 11, and >15.
573 */
574 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Sinan Kaya103544d2016-04-17 13:36:53 -0400575 if (acpi_irq_get_penalty(irq) >
576 acpi_irq_get_penalty(link->irq.possible[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 irq = link->irq.possible[i];
578 }
579 }
Sinan Kaya103544d2016-04-17 13:36:53 -0400580 if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
Jiang Liu5ebc76032015-09-17 14:02:45 +0800581 printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
582 "Try pci=noacpi or acpi=off\n",
583 acpi_device_name(link->device),
584 acpi_device_bid(link->device));
585 return -ENODEV;
586 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 /* Attempt to enable the link device at this IRQ. */
589 if (acpi_pci_link_set(link, irq)) {
Len Brown64684632006-06-26 23:41:38 -0400590 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
591 "Try pci=noacpi or acpi=off\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400592 acpi_device_name(link->device),
Len Brown64684632006-06-26 23:41:38 -0400593 acpi_device_bid(link->device));
Patrick Mocheld550d982006-06-27 00:41:40 -0400594 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 } else {
Sinan Kaya98756f52016-10-24 00:31:32 -0400596 if (link->irq.active < ACPI_MAX_ISA_IRQS)
597 acpi_isa_irq_penalty[link->irq.active] +=
598 PIRQ_PENALTY_PCI_USING;
599
Sinan Kaya90fd94e2018-01-16 13:51:04 -0500600 pr_info("%s [%s] enabled at IRQ %d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400601 acpi_device_name(link->device),
602 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 }
604
605 link->irq.initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400606 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
609/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400610 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 * success: return IRQ >= 0
612 * failure: return -1
613 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700614int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
615 int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700617 int result;
618 struct acpi_device *device;
619 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 result = acpi_bus_get_device(handle, &device);
622 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400623 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400624 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
626
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200627 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400629 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400630 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 }
632
633 /* TBD: Support multiple index (IRQ) entries per Link Device */
634 if (index) {
Len Brown64684632006-06-26 23:41:38 -0400635 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
Patrick Mocheld550d982006-06-27 00:41:40 -0400636 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 }
638
Ingo Molnar36e43092006-04-27 05:25:00 -0400639 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400640 if (acpi_pci_link_allocate(link)) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400641 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400642 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400643 }
Len Brown4be44fc2005-08-05 00:44:28 -0400644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (!link->irq.active) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400646 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400647 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400648 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 }
Len Brown4be44fc2005-08-05 00:44:28 -0400650 link->refcnt++;
Ingo Molnar36e43092006-04-27 05:25:00 -0400651 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Bob Moore50eca3e2005-09-30 19:03:00 -0400653 if (triggering)
654 *triggering = link->irq.triggering;
655 if (polarity)
656 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400657 if (name)
658 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400659 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400660 "Link %s is referenced\n",
661 acpi_device_bid(link->device)));
Krzysztof Wilczynski8698fab2019-08-19 15:53:24 +0200662 return link->irq.active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663}
664
David Shaohua Li87bec662005-07-27 23:02:00 -0400665/*
666 * We don't change link's irq information here. After it is reenabled, we
667 * continue use the info
668 */
Len Brown4be44fc2005-08-05 00:44:28 -0400669int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400670{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700671 struct acpi_device *device;
672 struct acpi_pci_link *link;
Len Brown4be44fc2005-08-05 00:44:28 -0400673 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
David Shaohua Li87bec662005-07-27 23:02:00 -0400675 result = acpi_bus_get_device(handle, &device);
676 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400677 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400678 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400679 }
680
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200681 link = acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400682 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400683 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400684 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400685 }
686
Ingo Molnar36e43092006-04-27 05:25:00 -0400687 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400688 if (!link->irq.initialized) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400689 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400690 printk(KERN_ERR PREFIX "Link isn't initialized\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400691 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400692 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400693#ifdef FUTURE_USE
694 /*
695 * The Link reference count allows us to _DISable an unused link
696 * and suspend time, and set it again on resume.
697 * However, 2.6.12 still has irq_router.resume
698 * which blindly restores the link state.
699 * So we disable the reference count method
700 * to prevent duplicate acpi_pci_link_set()
701 * which would harm some systems
702 */
Len Brown4be44fc2005-08-05 00:44:28 -0400703 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400704#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400705 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400706 "Link %s is dereferenced\n",
707 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400708
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700709 if (link->refcnt == 0)
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700710 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700711
Ingo Molnar36e43092006-04-27 05:25:00 -0400712 mutex_unlock(&acpi_link_lock);
Krzysztof Wilczynski8698fab2019-08-19 15:53:24 +0200713 return link->irq.active;
David Shaohua Li87bec662005-07-27 23:02:00 -0400714}
Len Brown4be44fc2005-08-05 00:44:28 -0400715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716/* --------------------------------------------------------------------------
717 Driver Interface
718 -------------------------------------------------------------------------- */
719
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100720static int acpi_pci_link_add(struct acpi_device *device,
721 const struct acpi_device_id *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700723 int result;
724 struct acpi_pci_link *link;
725 int i;
Len Brown4be44fc2005-08-05 00:44:28 -0400726 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Burman Yan36bcbec2006-12-19 12:56:11 -0800728 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400730 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 link->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
734 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700735 device->driver_data = link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
Ingo Molnar36e43092006-04-27 05:25:00 -0400737 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 result = acpi_pci_link_get_possible(link);
739 if (result)
740 goto end;
741
742 /* query and set link->irq.active */
743 acpi_pci_link_get_current(link);
744
Dan Aloni0dc070b2007-07-09 11:33:18 -0700745 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400746 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 for (i = 0; i < link->irq.possible_count; i++) {
748 if (link->irq.active == link->irq.possible[i]) {
Kay Sieversbe964472012-05-08 17:24:20 +0200749 printk(KERN_CONT " *%d", link->irq.possible[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400751 } else
Kay Sieversbe964472012-05-08 17:24:20 +0200752 printk(KERN_CONT " %d", link->irq.possible[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 }
754
Kay Sieversbe964472012-05-08 17:24:20 +0200755 printk(KERN_CONT ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 if (!found)
Kay Sieversbe964472012-05-08 17:24:20 +0200758 printk(KERN_CONT " *%d", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Len Brown4be44fc2005-08-05 00:44:28 -0400760 if (!link->device->status.enabled)
Kay Sieversbe964472012-05-08 17:24:20 +0200761 printk(KERN_CONT ", disabled.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Kay Sieversbe964472012-05-08 17:24:20 +0200763 printk(KERN_CONT "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700765 list_add_tail(&link->list, &acpi_link_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Len Brown4be44fc2005-08-05 00:44:28 -0400767 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 /* disable all links -- to be activated on use */
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700769 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
Ingo Molnar36e43092006-04-27 05:25:00 -0400770 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 if (result)
773 kfree(link);
774
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100775 return result < 0 ? result : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
Len Brown4be44fc2005-08-05 00:44:28 -0400778static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700779{
Linus Torvalds697a2d62005-08-01 12:37:54 -0700780 if (link->refcnt && link->irq.active && link->irq.initialized)
Patrick Mocheld550d982006-06-27 00:41:40 -0400781 return (acpi_pci_link_set(link, link->irq.active));
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700782
783 return 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700784}
785
Rafael J. Wysockic3146df22011-03-12 22:16:51 +0100786static void irqrouter_resume(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700788 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700790 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds697a2d62005-08-01 12:37:54 -0700791 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793}
794
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100795static void acpi_pci_link_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700797 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200799 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Ingo Molnar36e43092006-04-27 05:25:00 -0400801 mutex_lock(&acpi_link_lock);
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700802 list_del(&link->list);
Ingo Molnar36e43092006-04-27 05:25:00 -0400803 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806}
807
808/*
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400809 * modify acpi_isa_irq_penalty[] from cmdline
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 */
811static int __init acpi_irq_penalty_update(char *str, int used)
812{
813 int i;
814
815 for (i = 0; i < 16; i++) {
816 int retval;
817 int irq;
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400818 int new_penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Len Brown4be44fc2005-08-05 00:44:28 -0400820 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 if (!retval)
823 break; /* no number found */
824
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400825 /* see if this is a ISA IRQ */
826 if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS))
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100827 continue;
828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (used)
Sinan Kayaeeaed4b2016-10-24 00:31:30 -0400830 new_penalty = acpi_isa_irq_penalty[irq] +
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400831 PIRQ_PENALTY_ISA_USED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 else
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400833 new_penalty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400835 acpi_isa_irq_penalty[irq] = new_penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if (retval != 2) /* no next number */
837 break;
838 }
839 return 1;
840}
841
842/*
843 * We'd like PNP to call this routine for the
844 * single ISA_USED value for each legacy device.
845 * But instead it calls us with each POSSIBLE setting.
846 * There is no ISA_POSSIBLE weight, so we simply use
847 * the (small) PCI_USING penalty.
848 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500849void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400851 if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty)))
Sinan Kayaeeaed4b2016-10-24 00:31:30 -0400852 acpi_isa_irq_penalty[irq] +=
Sinan Kaya54794582016-06-29 04:27:38 -0400853 (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854}
855
Jiang Liu5ebc76032015-09-17 14:02:45 +0800856bool acpi_isa_irq_available(int irq)
857{
Sinan Kaya5c5087a2016-04-17 13:36:54 -0400858 return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) ||
Sinan Kaya103544d2016-04-17 13:36:53 -0400859 acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
Jiang Liu5ebc76032015-09-17 14:02:45 +0800860}
861
Sinan Kayaf1caa612016-10-24 00:31:31 -0400862void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
863{
864 sci_irq = irq;
865
866 if (trigger == ACPI_MADT_TRIGGER_LEVEL &&
867 polarity == ACPI_MADT_POLARITY_ACTIVE_LOW)
868 sci_penalty = PIRQ_PENALTY_PCI_USING;
869 else
870 sci_penalty = PIRQ_PENALTY_ISA_ALWAYS;
871}
872
Jiang Liu5d0ddfe2015-08-21 15:36:23 +0800873/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 * Over-ride default table to reserve additional IRQs for use by ISA
875 * e.g. acpi_irq_isa=5
876 * Useful for telling ACPI how not to interfere with your ISA sound card.
877 */
878static int __init acpi_irq_isa(char *str)
879{
880 return acpi_irq_penalty_update(str, 1);
881}
Len Brown4be44fc2005-08-05 00:44:28 -0400882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883__setup("acpi_irq_isa=", acpi_irq_isa);
884
885/*
886 * Over-ride default table to free additional IRQs for use by PCI
887 * e.g. acpi_irq_pci=7,15
888 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
889 */
890static int __init acpi_irq_pci(char *str)
891{
892 return acpi_irq_penalty_update(str, 0);
893}
Len Brown4be44fc2005-08-05 00:44:28 -0400894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895__setup("acpi_irq_pci=", acpi_irq_pci);
896
897static int __init acpi_irq_nobalance_set(char *str)
898{
899 acpi_irq_balance = 0;
900 return 1;
901}
Len Brown4be44fc2005-08-05 00:44:28 -0400902
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
904
Roel Kluin8a383ef2008-12-09 20:45:30 +0100905static int __init acpi_irq_balance_set(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
907 acpi_irq_balance = 1;
908 return 1;
909}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Len Brown4be44fc2005-08-05 00:44:28 -0400911__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
Rafael J. Wysockic3146df22011-03-12 22:16:51 +0100913static struct syscore_ops irqrouter_syscore_ops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400914 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915};
916
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100917void __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 if (acpi_noirq)
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100920 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Bjorn Helgaas32836252008-11-05 16:17:52 -0700922 if (acpi_irq_balance == -1) {
923 /* no command line switch: enable balancing in IOAPIC mode */
924 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
925 acpi_irq_balance = 1;
926 else
927 acpi_irq_balance = 0;
928 }
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100929 register_syscore_ops(&irqrouter_syscore_ops);
930 acpi_scan_add_handler(&pci_link_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931}