blob: ededa909df2fc02eb2b77fb495e43f8e850c5469 [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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 *
22 * TBD:
23 * 1. Support more than one IRQ resource entry per link device (index).
24 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
25 * for IRQ management (e.g. start()->_SRS).
26 */
27
Rafael J. Wysockic3146df2011-03-12 22:16:51 +010028#include <linux/syscore_ops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/spinlock.h>
34#include <linux/pm.h>
35#include <linux/pci.h>
Ingo Molnar36e43092006-04-27 05:25:00 -040036#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Lv Zheng8b484632013-12-03 08:49:16 +080038#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Rashikac071b6042013-12-17 14:58:31 +053040#include "internal.h"
41
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070042#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("pci_link");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
46#define ACPI_PCI_LINK_FILE_INFO "info"
47#define ACPI_PCI_LINK_FILE_STATUS "state"
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070048#define ACPI_PCI_LINK_MAX_POSSIBLE 16
49
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010050static int acpi_pci_link_add(struct acpi_device *device,
51 const struct acpi_device_id *not_used);
52static void acpi_pci_link_remove(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Márton Némethc97adf92010-01-10 17:15:36 +010054static const struct acpi_device_id link_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020055 {"PNP0C0F", 0},
56 {"", 0},
57};
Thomas Renninger1ba90e32007-07-23 14:44:41 +020058
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010059static struct acpi_scan_handler pci_link_handler = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020060 .ids = link_device_ids,
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +010061 .attach = acpi_pci_link_add,
62 .detach = acpi_pci_link_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
David Shaohua Li87bec662005-07-27 23:02:00 -040065/*
66 * If a link is initialized, we never change its active and initialized
67 * later even the link is disable. Instead, we just repick the active irq
68 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069struct acpi_pci_link_irq {
Sinan Kaya37c59392015-12-09 11:18:28 -050070 u32 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040071 u8 triggering; /* All IRQs */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070072 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040073 u8 resource_type;
74 u8 possible_count;
Sinan Kaya37c59392015-12-09 11:18:28 -050075 u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
Len Brown4be44fc2005-08-05 00:44:28 -040076 u8 initialized:1;
77 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078};
79
80struct acpi_pci_link {
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070081 struct list_head list;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070082 struct acpi_device *device;
83 struct acpi_pci_link_irq irq;
84 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085};
86
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070087static LIST_HEAD(acpi_link_list);
Adrian Bunke5685b92007-10-24 18:24:42 +020088static DEFINE_MUTEX(acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/* --------------------------------------------------------------------------
91 PCI Link Device Management
92 -------------------------------------------------------------------------- */
93
94/*
95 * set context (link) possible list from resource list
96 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070097static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
98 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200100 struct acpi_pci_link *link = context;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700101 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Len Browneca008c2005-09-22 00:25:18 -0400103 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400104 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600105 case ACPI_RESOURCE_TYPE_END_TAG:
Patrick Mocheld550d982006-06-27 00:41:40 -0400106 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400107 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400108 {
109 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400110 if (!p || !p->interrupt_count) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600111 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
112 "Blank _PRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400113 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
Len Brown4be44fc2005-08-05 00:44:28 -0400115 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400116 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400117 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
118 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600119 printk(KERN_WARNING PREFIX
120 "Invalid _PRS IRQ %d\n",
121 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400122 continue;
123 }
124 link->irq.possible[i] = p->interrupts[i];
125 link->irq.possible_count++;
126 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400127 link->irq.triggering = p->triggering;
128 link->irq.polarity = p->polarity;
129 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400130 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400132 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400133 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400134 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400135 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400136 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400137 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600138 "Blank _PRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
Len Brown4be44fc2005-08-05 00:44:28 -0400141 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400142 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400143 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
144 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600145 printk(KERN_WARNING PREFIX
146 "Invalid _PRS IRQ %d\n",
147 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400148 continue;
149 }
150 link->irq.possible[i] = p->interrupts[i];
151 link->irq.possible_count++;
152 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400153 link->irq.triggering = p->triggering;
154 link->irq.polarity = p->polarity;
155 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400156 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600159 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
160 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400161 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
163
Patrick Mocheld550d982006-06-27 00:41:40 -0400164 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
Len Brown4be44fc2005-08-05 00:44:28 -0400167static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
Len Brown4be44fc2005-08-05 00:44:28 -0400169 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Patrick Mochel67a71362006-05-19 16:54:42 -0400171 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400172 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400174 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400175 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177
Len Brown4be44fc2005-08-05 00:44:28 -0400178 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
179 "Found %d possible IRQs\n",
180 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Patrick Mocheld550d982006-06-27 00:41:40 -0400182 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700185static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
186 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700188 int *irq = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Len Browneca008c2005-09-22 00:25:18 -0400190 switch (resource->type) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600191 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
192 case ACPI_RESOURCE_TYPE_END_TAG:
193 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400194 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400195 {
196 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400197 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400198 /*
199 * IRQ descriptors may have no IRQ# bits set,
200 * particularly those those w/ _STA disabled
201 */
202 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600203 "Blank _CRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400204 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400205 }
206 *irq = p->interrupts[0];
207 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400209 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400210 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400211 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400212 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400213 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400214 /*
215 * extended IRQ descriptors must
216 * return at least 1 IRQ
217 */
Len Browncece9292006-06-26 23:04:31 -0400218 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600219 "Blank _CRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400220 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400221 }
222 *irq = p->interrupts[0];
223 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500225 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600227 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
228 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400229 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 }
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600231
Patrick Mocheld550d982006-06-27 00:41:40 -0400232 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235/*
236 * Run _CRS and set link->irq.active
237 *
238 * return value:
239 * 0 - success
240 * !0 - failure
241 */
Len Brown4be44fc2005-08-05 00:44:28 -0400242static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Len Brown4be44fc2005-08-05 00:44:28 -0400244 int result = 0;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700245 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400246 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 link->irq.active = 0;
249
250 /* in practice, status disabled is meaningless, ignore it */
251 if (acpi_strict) {
252 /* Query _STA, set link->device->status */
253 result = acpi_bus_get_status(link->device);
254 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400255 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 goto end;
257 }
258
259 if (!link->device->status.enabled) {
260 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400261 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
263 }
264
265 /*
266 * Query and parse _CRS to get the current IRQ assignment.
267 */
268
Patrick Mochel67a71362006-05-19 16:54:42 -0400269 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400270 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400272 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 result = -ENODEV;
274 goto end;
275 }
276
277 if (acpi_strict && !irq) {
Len Brown64684632006-06-26 23:41:38 -0400278 printk(KERN_ERR PREFIX "_CRS returned 0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 result = -ENODEV;
280 }
281
282 link->irq.active = irq;
283
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
285
Len Brown4be44fc2005-08-05 00:44:28 -0400286 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400287 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Len Brown4be44fc2005-08-05 00:44:28 -0400290static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700292 int result;
293 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400295 struct acpi_resource res;
296 struct acpi_resource end;
297 } *resource;
298 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Bjorn Helgaas6eca4b42009-02-17 14:00:50 -0700300 if (!irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400301 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Burman Yan36bcbec2006-12-19 12:56:11 -0800303 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400304 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400305 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Len Brown4be44fc2005-08-05 00:44:28 -0400307 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 buffer.pointer = resource;
309
Len Brown4be44fc2005-08-05 00:44:28 -0400310 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400311 case ACPI_RESOURCE_TYPE_IRQ:
312 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400314 resource->res.data.irq.triggering = link->irq.triggering;
315 resource->res.data.irq.polarity =
316 link->irq.polarity;
317 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
318 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400319 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400321 resource->res.data.irq.sharable = ACPI_SHARED;
322 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 resource->res.data.irq.interrupts[0] = irq;
324 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400325
Bob Moore50eca3e2005-09-30 19:03:00 -0400326 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
327 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400329 resource->res.data.extended_irq.producer_consumer =
330 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400331 resource->res.data.extended_irq.triggering =
332 link->irq.triggering;
333 resource->res.data.extended_irq.polarity =
334 link->irq.polarity;
335 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
336 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400337 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400339 resource->res.data.irq.sharable = ACPI_SHARED;
340 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 resource->res.data.extended_irq.interrupts[0] = irq;
342 /* ignore resource_source, it's optional */
343 break;
344 default:
Len Brown64684632006-06-26 23:41:38 -0400345 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 result = -EINVAL;
347 goto end;
348
349 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400350 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Yinghai Luf084dbb2013-03-23 19:16:37 +0000351 resource->end.length = sizeof(struct acpi_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400354 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 /* check for total failure */
357 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400358 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 result = -ENODEV;
360 goto end;
361 }
362
363 /* Query _STA, set device->status */
364 result = acpi_bus_get_status(link->device);
365 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400366 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 goto end;
368 }
369 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400370 printk(KERN_WARNING PREFIX
371 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400372 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400373 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
375
376 /* Query _CRS, set link->irq.active */
377 result = acpi_pci_link_get_current(link);
378 if (result) {
379 goto end;
380 }
381
382 /*
383 * Is current setting not what we set?
384 * set link->irq.active
385 */
386 if (link->irq.active != irq) {
387 /*
388 * policy: when _CRS doesn't return what we just _SRS
389 * assume _SRS worked and override _CRS value.
390 */
Len Browncece9292006-06-26 23:04:31 -0400391 printk(KERN_WARNING PREFIX
392 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400393 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400394 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 link->irq.active = irq;
396 }
397
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400399
400 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400402 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405/* --------------------------------------------------------------------------
406 PCI Link IRQ Management
407 -------------------------------------------------------------------------- */
408
409/*
410 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
411 * Link Devices to move the PIRQs around to minimize sharing.
412 *
413 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
414 * that the BIOS has already set to active. This is necessary because
415 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
416 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
417 * even if acpi_irq_nobalance is set.
418 *
419 * A tables of penalties avoids directing PCI interrupts to well known
420 * ISA IRQs. Boot params are available to over-ride the default table:
421 *
422 * List interrupts that are free for PCI use.
423 * acpi_irq_pci=n[,m]
424 *
425 * List interrupts that should not be used for PCI:
426 * acpi_irq_isa=n[,m]
427 *
428 * Note that PCI IRQ routers have a list of possible IRQs,
429 * which may not include the IRQs this table says are available.
430 *
431 * Since this heuristic can't tell the difference between a link
432 * that no device will attach to, vs. a link which may be shared
433 * by multiple active devices -- it is not optimal.
434 *
435 * If interrupt performance is that important, get an IO-APIC system
436 * with a pin dedicated to each device. Or for that matter, an MSI
437 * enabled system.
438 */
439
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100440#define ACPI_MAX_IRQS 256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441#define ACPI_MAX_ISA_IRQ 16
442
443#define PIRQ_PENALTY_PCI_AVAILABLE (0)
444#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
445#define PIRQ_PENALTY_PCI_USING (16*16*16)
446#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
447#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
448#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
449
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100450static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
452 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
453 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400454 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
455 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
457 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
458 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
459 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
460 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
461 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
462 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700463 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
464 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
465 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
466 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100467 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468};
469
Len Brown4be44fc2005-08-05 00:44:28 -0400470int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700472 struct acpi_pci_link *link;
473 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 /*
476 * Update penalties to facilitate IRQ balancing.
477 */
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700478 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 /*
481 * reflect the possible and active irqs in the penalty table --
482 * useful for breaking ties.
483 */
484 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400485 int penalty =
486 PIRQ_PENALTY_PCI_POSSIBLE /
487 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 for (i = 0; i < link->irq.possible_count; i++) {
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100490 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
491 acpi_irq_penalty[link->irq.
492 possible[i]] +=
493 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495
496 } else if (link->irq.active) {
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100497 acpi_irq_penalty[link->irq.active] +=
498 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
500 }
Jiang Liud323efc2015-09-17 14:02:46 +0800501
Patrick Mocheld550d982006-06-27 00:41:40 -0400502 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503}
504
Bjorn Helgaas32836252008-11-05 16:17:52 -0700505static int acpi_irq_balance = -1; /* 0: static, 1: balance */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Len Brown4be44fc2005-08-05 00:44:28 -0400507static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508{
Len Brown4be44fc2005-08-05 00:44:28 -0400509 int irq;
510 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
David Shaohua Li87bec662005-07-27 23:02:00 -0400512 if (link->irq.initialized) {
513 if (link->refcnt == 0)
514 /* This means the link is disabled but initialized */
515 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400516 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400517 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 /*
520 * search for active IRQ in list of possible IRQs.
521 */
522 for (i = 0; i < link->irq.possible_count; ++i) {
523 if (link->irq.active == link->irq.possible[i])
524 break;
525 }
526 /*
527 * forget active IRQ that is not in possible list
528 */
529 if (i == link->irq.possible_count) {
530 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400531 printk(KERN_WARNING PREFIX "_CRS %d not found"
532 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 link->irq.active = 0;
534 }
535
536 /*
537 * if active found, use it; else pick entry from end of possible list.
538 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700539 if (link->irq.active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 irq = link->irq.active;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700541 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 irq = link->irq.possible[link->irq.possible_count - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 if (acpi_irq_balance || !link->irq.active) {
545 /*
546 * Select the best IRQ. This is done in reverse to promote
547 * the use of IRQs 9, 10, 11, and >15.
548 */
549 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100550 if (acpi_irq_penalty[irq] >
551 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 irq = link->irq.possible[i];
553 }
554 }
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100555 if (acpi_irq_penalty[irq] >= PIRQ_PENALTY_ISA_ALWAYS) {
Jiang Liu5ebc7602015-09-17 14:02:45 +0800556 printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
557 "Try pci=noacpi or acpi=off\n",
558 acpi_device_name(link->device),
559 acpi_device_bid(link->device));
560 return -ENODEV;
561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
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 {
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100571 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/*
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100781 * modify acpi_irq_penalty[] from cmdline
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 */
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
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100799 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
800 continue;
801
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 if (used)
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100803 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 else
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100805 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
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{
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100822 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
Jiang Liu5ebc7602015-09-17 14:02:45 +0800830bool acpi_isa_irq_available(int irq)
831{
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100832 return irq >= 0 && (irq >= ARRAY_SIZE(acpi_irq_penalty) ||
833 acpi_irq_penalty[irq] < PIRQ_PENALTY_ISA_ALWAYS);
Jiang Liu5ebc7602015-09-17 14:02:45 +0800834}
835
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836/*
Jiang Liu5d0ddfe2015-08-21 15:36:23 +0800837 * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict with
838 * PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be use for
839 * PCI IRQs.
840 */
841void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
842{
Rafael J. Wysockie2497142016-02-24 13:55:38 +0100843 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
844 if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
845 polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
846 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS;
847 else
848 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
849 }
Jiang Liu5d0ddfe2015-08-21 15:36:23 +0800850}
851
852/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 * Over-ride default table to reserve additional IRQs for use by ISA
854 * e.g. acpi_irq_isa=5
855 * Useful for telling ACPI how not to interfere with your ISA sound card.
856 */
857static int __init acpi_irq_isa(char *str)
858{
859 return acpi_irq_penalty_update(str, 1);
860}
Len Brown4be44fc2005-08-05 00:44:28 -0400861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862__setup("acpi_irq_isa=", acpi_irq_isa);
863
864/*
865 * Over-ride default table to free additional IRQs for use by PCI
866 * e.g. acpi_irq_pci=7,15
867 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
868 */
869static int __init acpi_irq_pci(char *str)
870{
871 return acpi_irq_penalty_update(str, 0);
872}
Len Brown4be44fc2005-08-05 00:44:28 -0400873
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874__setup("acpi_irq_pci=", acpi_irq_pci);
875
876static int __init acpi_irq_nobalance_set(char *str)
877{
878 acpi_irq_balance = 0;
879 return 1;
880}
Len Brown4be44fc2005-08-05 00:44:28 -0400881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
883
Roel Kluin8a383ef2008-12-09 20:45:30 +0100884static int __init acpi_irq_balance_set(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
886 acpi_irq_balance = 1;
887 return 1;
888}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Len Brown4be44fc2005-08-05 00:44:28 -0400890__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Rafael J. Wysockic3146df2011-03-12 22:16:51 +0100892static struct syscore_ops irqrouter_syscore_ops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400893 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894};
895
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100896void __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (acpi_noirq)
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100899 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Bjorn Helgaas32836252008-11-05 16:17:52 -0700901 if (acpi_irq_balance == -1) {
902 /* no command line switch: enable balancing in IOAPIC mode */
903 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
904 acpi_irq_balance = 1;
905 else
906 acpi_irq_balance = 0;
907 }
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +0100908 register_syscore_ops(&irqrouter_syscore_ops);
909 acpi_scan_add_handler(&pci_link_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910}