Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * 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. Wysocki | c3146df2 | 2011-03-12 22:16:51 +0100 | [diff] [blame] | 15 | #include <linux/syscore_ops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/pm.h> |
| 22 | #include <linux/pci.h> |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 25 | #include <linux/acpi.h> |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 26 | #include <linux/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Rashika | c071b604 | 2013-12-17 14:58:31 +0530 | [diff] [blame] | 28 | #include "internal.h" |
| 29 | |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 30 | #define _COMPONENT ACPI_PCI_COMPONENT |
Len Brown | f52fd66 | 2007-02-12 22:42:12 -0500 | [diff] [blame] | 31 | ACPI_MODULE_NAME("pci_link"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 34 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
| 35 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 36 | static int acpi_pci_link_add(struct acpi_device *device, |
| 37 | const struct acpi_device_id *not_used); |
| 38 | static void acpi_pci_link_remove(struct acpi_device *device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Márton Németh | c97adf9 | 2010-01-10 17:15:36 +0100 | [diff] [blame] | 40 | static const struct acpi_device_id link_device_ids[] = { |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 41 | {"PNP0C0F", 0}, |
| 42 | {"", 0}, |
| 43 | }; |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 44 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 45 | static struct acpi_scan_handler pci_link_handler = { |
Thomas Renninger | 1ba90e3 | 2007-07-23 14:44:41 +0200 | [diff] [blame] | 46 | .ids = link_device_ids, |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 47 | .attach = acpi_pci_link_add, |
| 48 | .detach = acpi_pci_link_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | }; |
| 50 | |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 51 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | struct acpi_pci_link_irq { |
Sinan Kaya | 37c5939 | 2015-12-09 11:18:28 -0500 | [diff] [blame] | 56 | u32 active; /* Current IRQ */ |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 57 | u8 triggering; /* All IRQs */ |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 58 | u8 polarity; /* All IRQs */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 59 | u8 resource_type; |
| 60 | u8 possible_count; |
Sinan Kaya | 37c5939 | 2015-12-09 11:18:28 -0500 | [diff] [blame] | 61 | u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 62 | u8 initialized:1; |
| 63 | u8 reserved:7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | struct acpi_pci_link { |
Bjorn Helgaas | 5f0dcca | 2009-02-17 14:00:55 -0700 | [diff] [blame] | 67 | struct list_head list; |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 68 | struct acpi_device *device; |
| 69 | struct acpi_pci_link_irq irq; |
| 70 | int refcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | }; |
| 72 | |
Bjorn Helgaas | 5f0dcca | 2009-02-17 14:00:55 -0700 | [diff] [blame] | 73 | static LIST_HEAD(acpi_link_list); |
Adrian Bunk | e5685b9 | 2007-10-24 18:24:42 +0200 | [diff] [blame] | 74 | static DEFINE_MUTEX(acpi_link_lock); |
Sinan Kaya | f1caa61 | 2016-10-24 00:31:31 -0400 | [diff] [blame] | 75 | static int sci_irq = -1, sci_penalty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | /* -------------------------------------------------------------------------- |
| 78 | PCI Link Device Management |
| 79 | -------------------------------------------------------------------------- */ |
| 80 | |
| 81 | /* |
| 82 | * set context (link) possible list from resource list |
| 83 | */ |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 84 | static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, |
| 85 | void *context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 87 | struct acpi_pci_link *link = context; |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 88 | u32 i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Len Brown | eca008c | 2005-09-22 00:25:18 -0400 | [diff] [blame] | 90 | switch (resource->type) { |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 91 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 92 | case ACPI_RESOURCE_TYPE_END_TAG: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 93 | return AE_OK; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 94 | case ACPI_RESOURCE_TYPE_IRQ: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 95 | { |
| 96 | struct acpi_resource_irq *p = &resource->data.irq; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 97 | if (!p || !p->interrupt_count) { |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 98 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 99 | "Blank _PRS IRQ resource\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 100 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 102 | for (i = 0; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 103 | (i < p->interrupt_count |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 104 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
| 105 | if (!p->interrupts[i]) { |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 106 | printk(KERN_WARNING PREFIX |
| 107 | "Invalid _PRS IRQ %d\n", |
| 108 | p->interrupts[i]); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 109 | continue; |
| 110 | } |
| 111 | link->irq.possible[i] = p->interrupts[i]; |
| 112 | link->irq.possible_count++; |
| 113 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 114 | link->irq.triggering = p->triggering; |
| 115 | link->irq.polarity = p->polarity; |
| 116 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 117 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 119 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 120 | { |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 121 | struct acpi_resource_extended_irq *p = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 122 | &resource->data.extended_irq; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 123 | if (!p || !p->interrupt_count) { |
Len Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 124 | printk(KERN_WARNING PREFIX |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 125 | "Blank _PRS EXT IRQ resource\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 126 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 128 | for (i = 0; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 129 | (i < p->interrupt_count |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 130 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
| 131 | if (!p->interrupts[i]) { |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 132 | printk(KERN_WARNING PREFIX |
| 133 | "Invalid _PRS IRQ %d\n", |
| 134 | p->interrupts[i]); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 135 | continue; |
| 136 | } |
| 137 | link->irq.possible[i] = p->interrupts[i]; |
| 138 | link->irq.possible_count++; |
| 139 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 140 | link->irq.triggering = p->triggering; |
| 141 | link->irq.polarity = p->polarity; |
| 142 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 143 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | default: |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 146 | printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", |
| 147 | resource->type); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 148 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 151 | return AE_CTRL_TERMINATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 154 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 156 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Patrick Mochel | 67a7136 | 2006-05-19 16:54:42 -0400 | [diff] [blame] | 158 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | acpi_pci_link_check_possible, link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | if (ACPI_FAILURE(status)) { |
Alex Hung | 92d1b38 | 2018-02-22 21:43:44 -0800 | [diff] [blame] | 161 | acpi_handle_debug(link->device->handle, "_PRS not present or invalid"); |
| 162 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 165 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 166 | "Found %d possible IRQs\n", |
| 167 | link->irq.possible_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 169 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 172 | static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, |
| 173 | void *context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 175 | int *irq = context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Len Brown | eca008c | 2005-09-22 00:25:18 -0400 | [diff] [blame] | 177 | switch (resource->type) { |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 178 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
| 179 | case ACPI_RESOURCE_TYPE_END_TAG: |
| 180 | return AE_OK; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 181 | case ACPI_RESOURCE_TYPE_IRQ: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 182 | { |
| 183 | struct acpi_resource_irq *p = &resource->data.irq; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 184 | if (!p || !p->interrupt_count) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 185 | /* |
| 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 Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 190 | "Blank _CRS IRQ resource\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 191 | return AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 192 | } |
| 193 | *irq = p->interrupts[0]; |
| 194 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 196 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 197 | { |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 198 | struct acpi_resource_extended_irq *p = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 199 | &resource->data.extended_irq; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 200 | if (!p || !p->interrupt_count) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 201 | /* |
| 202 | * extended IRQ descriptors must |
| 203 | * return at least 1 IRQ |
| 204 | */ |
Len Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 205 | printk(KERN_WARNING PREFIX |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 206 | "Blank _CRS EXT IRQ resource\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 207 | return AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 208 | } |
| 209 | *irq = p->interrupts[0]; |
| 210 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
Len Brown | d4ec6c7 | 2006-01-26 17:23:38 -0500 | [diff] [blame] | 212 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | default: |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 214 | printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", |
| 215 | resource->type); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 216 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
Bjorn Helgaas | 4a5e363 | 2008-07-15 09:42:57 -0600 | [diff] [blame] | 218 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 219 | return AE_CTRL_TERMINATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Run _CRS and set link->irq.active |
| 224 | * |
| 225 | * return value: |
| 226 | * 0 - success |
| 227 | * !0 - failure |
| 228 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 229 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 231 | int result = 0; |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 232 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 233 | int irq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | 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 Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 242 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | goto end; |
| 244 | } |
| 245 | |
| 246 | if (!link->device->status.enabled) { |
| 247 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 248 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Query and parse _CRS to get the current IRQ assignment. |
| 254 | */ |
| 255 | |
Patrick Mochel | 67a7136 | 2006-05-19 16:54:42 -0400 | [diff] [blame] | 256 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 257 | acpi_pci_link_check_current, &irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 259 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | result = -ENODEV; |
| 261 | goto end; |
| 262 | } |
| 263 | |
| 264 | if (acpi_strict && !irq) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 265 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | 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 Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 273 | end: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 274 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 277 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 279 | int result; |
| 280 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | struct { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 282 | struct acpi_resource res; |
| 283 | struct acpi_resource end; |
| 284 | } *resource; |
| 285 | struct acpi_buffer buffer = { 0, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Bjorn Helgaas | 6eca4b4 | 2009-02-17 14:00:50 -0700 | [diff] [blame] | 287 | if (!irq) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 288 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Burman Yan | 36bcbec | 2006-12-19 12:56:11 -0800 | [diff] [blame] | 290 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 291 | if (!resource) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 292 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 294 | buffer.length = sizeof(*resource) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | buffer.pointer = resource; |
| 296 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 297 | switch (link->irq.resource_type) { |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 298 | case ACPI_RESOURCE_TYPE_IRQ: |
| 299 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | resource->res.length = sizeof(struct acpi_resource); |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 301 | 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 Schmauss | c163f90c | 2019-02-15 13:36:19 -0800 | [diff] [blame] | 305 | resource->res.data.irq.shareable = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 306 | ACPI_EXCLUSIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | else |
Erik Schmauss | c163f90c | 2019-02-15 13:36:19 -0800 | [diff] [blame] | 308 | resource->res.data.irq.shareable = ACPI_SHARED; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 309 | resource->res.data.irq.interrupt_count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | resource->res.data.irq.interrupts[0] = irq; |
| 311 | break; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 312 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 313 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
| 314 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | resource->res.length = sizeof(struct acpi_resource); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 316 | resource->res.data.extended_irq.producer_consumer = |
| 317 | ACPI_CONSUMER; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 318 | 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 Goede | 1c5e1cd | 2020-04-13 15:09:49 +0200 | [diff] [blame] | 323 | resource->res.data.extended_irq.shareable = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 324 | ACPI_EXCLUSIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | else |
Hans de Goede | 1c5e1cd | 2020-04-13 15:09:49 +0200 | [diff] [blame] | 326 | resource->res.data.extended_irq.shareable = ACPI_SHARED; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 327 | resource->res.data.extended_irq.interrupt_count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | resource->res.data.extended_irq.interrupts[0] = irq; |
| 329 | /* ignore resource_source, it's optional */ |
| 330 | break; |
| 331 | default: |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 332 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | result = -EINVAL; |
| 334 | goto end; |
| 335 | |
| 336 | } |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 337 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
Yinghai Lu | f084dbb | 2013-03-23 19:16:37 +0000 | [diff] [blame] | 338 | resource->end.length = sizeof(struct acpi_resource); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | /* Attempt to set the resource */ |
Patrick Mochel | 67a7136 | 2006-05-19 16:54:42 -0400 | [diff] [blame] | 341 | status = acpi_set_current_resources(link->device->handle, &buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | /* check for total failure */ |
| 344 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 345 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | 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 Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 353 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | goto end; |
| 355 | } |
| 356 | if (!link->device->status.enabled) { |
Len Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 357 | printk(KERN_WARNING PREFIX |
| 358 | "%s [%s] disabled and referenced, BIOS bug\n", |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 359 | acpi_device_name(link->device), |
Len Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 360 | acpi_device_bid(link->device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 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 Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 378 | printk(KERN_WARNING PREFIX |
| 379 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 380 | acpi_device_name(link->device), |
Len Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 381 | acpi_device_bid(link->device), link->irq.active, irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | link->irq.active = irq; |
| 383 | } |
| 384 | |
| 385 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 386 | |
| 387 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | kfree(resource); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 389 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | /* -------------------------------------------------------------------------- |
| 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 Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 427 | #define ACPI_MAX_ISA_IRQS 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | #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 Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 435 | static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ |
| 437 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ |
| 438 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 439 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
| 440 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | 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 Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 445 | 0, /* IRQ9 PCI, often acpi */ |
| 446 | 0, /* IRQ10 PCI */ |
| 447 | 0, /* IRQ11 PCI */ |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 448 | 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. Wysocki | e249714 | 2016-02-24 13:55:38 +0100 | [diff] [blame] | 452 | /* >IRQ15 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | }; |
| 454 | |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 455 | static int acpi_irq_pci_sharing_penalty(int irq) |
| 456 | { |
| 457 | struct acpi_pci_link *link; |
| 458 | int penalty = 0; |
Sinan Kaya | 4a6e68b | 2016-06-29 04:27:35 -0400 | [diff] [blame] | 459 | int i; |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 460 | |
| 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 Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 468 | |
Sinan Kaya | 4a6e68b | 2016-06-29 04:27:35 -0400 | [diff] [blame] | 469 | /* |
| 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 Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | return penalty; |
| 479 | } |
| 480 | |
| 481 | static int acpi_irq_get_penalty(int irq) |
| 482 | { |
| 483 | int penalty = 0; |
| 484 | |
Sinan Kaya | f1caa61 | 2016-10-24 00:31:31 -0400 | [diff] [blame] | 485 | if (irq == sci_irq) |
| 486 | penalty += sci_penalty; |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 487 | |
Sinan Kaya | f7eca37 | 2016-06-29 04:27:37 -0400 | [diff] [blame] | 488 | if (irq < ACPI_MAX_ISA_IRQS) |
| 489 | return penalty + acpi_isa_irq_penalty[irq]; |
| 490 | |
Sinan Kaya | f1caa61 | 2016-10-24 00:31:31 -0400 | [diff] [blame] | 491 | return penalty + acpi_irq_pci_sharing_penalty(irq); |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 492 | } |
| 493 | |
Sinan Kaya | 487cf917 | 2016-06-29 04:27:36 -0400 | [diff] [blame] | 494 | int __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 Helgaas | 3283625 | 2008-11-05 16:17:52 -0700 | [diff] [blame] | 530 | static int acpi_irq_balance = -1; /* 0: static, 1: balance */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 532 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 534 | int irq; |
| 535 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 537 | 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 Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 541 | return 0; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 542 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 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 Brown | cece929 | 2006-06-26 23:04:31 -0400 | [diff] [blame] | 556 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
| 557 | " in _PRS\n", link->irq.active); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | link->irq.active = 0; |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * if active found, use it; else pick entry from end of possible list. |
| 563 | */ |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 564 | if (link->irq.active) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | irq = link->irq.active; |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 566 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | irq = link->irq.possible[link->irq.possible_count - 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
| 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 Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 575 | if (acpi_irq_get_penalty(irq) > |
| 576 | acpi_irq_get_penalty(link->irq.possible[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | irq = link->irq.possible[i]; |
| 578 | } |
| 579 | } |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 580 | if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) { |
Jiang Liu | 5ebc7603 | 2015-09-17 14:02:45 +0800 | [diff] [blame] | 581 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | /* Attempt to enable the link device at this IRQ. */ |
| 589 | if (acpi_pci_link_set(link, irq)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 590 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
| 591 | "Try pci=noacpi or acpi=off\n", |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 592 | acpi_device_name(link->device), |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 593 | acpi_device_bid(link->device)); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 594 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } else { |
Sinan Kaya | 98756f5 | 2016-10-24 00:31:32 -0400 | [diff] [blame] | 596 | if (link->irq.active < ACPI_MAX_ISA_IRQS) |
| 597 | acpi_isa_irq_penalty[link->irq.active] += |
| 598 | PIRQ_PENALTY_PCI_USING; |
| 599 | |
Sinan Kaya | 90fd94e | 2018-01-16 13:51:04 -0500 | [diff] [blame] | 600 | pr_info("%s [%s] enabled at IRQ %d\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 601 | acpi_device_name(link->device), |
| 602 | acpi_device_bid(link->device), link->irq.active); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | link->irq.initialized = 1; |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 606 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | /* |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 610 | * acpi_pci_link_allocate_irq |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | * success: return IRQ >= 0 |
| 612 | * failure: return -1 |
| 613 | */ |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 614 | int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, |
| 615 | int *polarity, char **name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 617 | int result; |
| 618 | struct acpi_device *device; |
| 619 | struct acpi_pci_link *link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | result = acpi_bus_get_device(handle, &device); |
| 622 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 623 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 624 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 627 | link = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | if (!link) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 629 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 630 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
| 633 | /* TBD: Support multiple index (IRQ) entries per Link Device */ |
| 634 | if (index) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 635 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 636 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | } |
| 638 | |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 639 | mutex_lock(&acpi_link_lock); |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 640 | if (acpi_pci_link_allocate(link)) { |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 641 | mutex_unlock(&acpi_link_lock); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 642 | return -1; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 643 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (!link->irq.active) { |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 646 | mutex_unlock(&acpi_link_lock); |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 647 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 648 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 650 | link->refcnt++; |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 651 | mutex_unlock(&acpi_link_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 653 | if (triggering) |
| 654 | *triggering = link->irq.triggering; |
| 655 | if (polarity) |
| 656 | *polarity = link->irq.polarity; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 657 | if (name) |
| 658 | *name = acpi_device_bid(link->device); |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 659 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 660 | "Link %s is referenced\n", |
| 661 | acpi_device_bid(link->device))); |
Krzysztof Wilczynski | 8698fab | 2019-08-19 15:53:24 +0200 | [diff] [blame] | 662 | return link->irq.active; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 665 | /* |
| 666 | * We don't change link's irq information here. After it is reenabled, we |
| 667 | * continue use the info |
| 668 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 669 | int acpi_pci_link_free_irq(acpi_handle handle) |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 670 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 671 | struct acpi_device *device; |
| 672 | struct acpi_pci_link *link; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 673 | acpi_status result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 675 | result = acpi_bus_get_device(handle, &device); |
| 676 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 677 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 678 | return -1; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 679 | } |
| 680 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 681 | link = acpi_driver_data(device); |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 682 | if (!link) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 683 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 684 | return -1; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 685 | } |
| 686 | |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 687 | mutex_lock(&acpi_link_lock); |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 688 | if (!link->irq.initialized) { |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 689 | mutex_unlock(&acpi_link_lock); |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 690 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 691 | return -1; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 692 | } |
David Shaohua Li | ecc21eb | 2005-08-03 11:00:11 -0400 | [diff] [blame] | 693 | #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 Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 703 | link->refcnt--; |
David Shaohua Li | ecc21eb | 2005-08-03 11:00:11 -0400 | [diff] [blame] | 704 | #endif |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 705 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 706 | "Link %s is dereferenced\n", |
| 707 | acpi_device_bid(link->device))); |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 708 | |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 709 | if (link->refcnt == 0) |
donald.d.dugger@intel.com | 383d7a1 | 2008-10-17 07:49:50 -0700 | [diff] [blame] | 710 | acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 711 | |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 712 | mutex_unlock(&acpi_link_lock); |
Krzysztof Wilczynski | 8698fab | 2019-08-19 15:53:24 +0200 | [diff] [blame] | 713 | return link->irq.active; |
David Shaohua Li | 87bec66 | 2005-07-27 23:02:00 -0400 | [diff] [blame] | 714 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | /* -------------------------------------------------------------------------- |
| 717 | Driver Interface |
| 718 | -------------------------------------------------------------------------- */ |
| 719 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 720 | static int acpi_pci_link_add(struct acpi_device *device, |
| 721 | const struct acpi_device_id *not_used) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 723 | int result; |
| 724 | struct acpi_pci_link *link; |
| 725 | int i; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 726 | int found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
Burman Yan | 36bcbec | 2006-12-19 12:56:11 -0800 | [diff] [blame] | 728 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | if (!link) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 730 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
| 732 | link->device = device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
| 734 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); |
Pavel Machek | db89b4f | 2008-09-22 14:37:34 -0700 | [diff] [blame] | 735 | device->driver_data = link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 737 | mutex_lock(&acpi_link_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | 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 Aloni | 0dc070b | 2007-07-09 11:33:18 -0700 | [diff] [blame] | 745 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 746 | acpi_device_bid(device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | for (i = 0; i < link->irq.possible_count; i++) { |
| 748 | if (link->irq.active == link->irq.possible[i]) { |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 749 | printk(KERN_CONT " *%d", link->irq.possible[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | found = 1; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 751 | } else |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 752 | printk(KERN_CONT " %d", link->irq.possible[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 755 | printk(KERN_CONT ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
| 757 | if (!found) |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 758 | printk(KERN_CONT " *%d", link->irq.active); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 760 | if (!link->device->status.enabled) |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 761 | printk(KERN_CONT ", disabled."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Kay Sievers | be96447 | 2012-05-08 17:24:20 +0200 | [diff] [blame] | 763 | printk(KERN_CONT "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Bjorn Helgaas | 5f0dcca | 2009-02-17 14:00:55 -0700 | [diff] [blame] | 765 | list_add_tail(&link->list, &acpi_link_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 767 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | /* disable all links -- to be activated on use */ |
donald.d.dugger@intel.com | 383d7a1 | 2008-10-17 07:49:50 -0700 | [diff] [blame] | 769 | acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 770 | mutex_unlock(&acpi_link_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
| 772 | if (result) |
| 773 | kfree(link); |
| 774 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 775 | return result < 0 ? result : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 778 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
Linus Torvalds | 697a2d6 | 2005-08-01 12:37:54 -0700 | [diff] [blame] | 779 | { |
Linus Torvalds | 697a2d6 | 2005-08-01 12:37:54 -0700 | [diff] [blame] | 780 | if (link->refcnt && link->irq.active && link->irq.initialized) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 781 | return (acpi_pci_link_set(link, link->irq.active)); |
Bjorn Helgaas | 1c9ca3a | 2009-02-17 14:00:40 -0700 | [diff] [blame] | 782 | |
| 783 | return 0; |
Linus Torvalds | 697a2d6 | 2005-08-01 12:37:54 -0700 | [diff] [blame] | 784 | } |
| 785 | |
Rafael J. Wysocki | c3146df2 | 2011-03-12 22:16:51 +0100 | [diff] [blame] | 786 | static void irqrouter_resume(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 788 | struct acpi_pci_link *link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Bjorn Helgaas | 5f0dcca | 2009-02-17 14:00:55 -0700 | [diff] [blame] | 790 | list_for_each_entry(link, &acpi_link_list, list) { |
Linus Torvalds | 697a2d6 | 2005-08-01 12:37:54 -0700 | [diff] [blame] | 791 | acpi_pci_link_resume(link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 795 | static void acpi_pci_link_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | { |
Bjorn Helgaas | c9d6244 | 2009-02-17 14:00:45 -0700 | [diff] [blame] | 797 | struct acpi_pci_link *link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Jan Engelhardt | 50dd096 | 2006-10-01 00:28:50 +0200 | [diff] [blame] | 799 | link = acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 801 | mutex_lock(&acpi_link_lock); |
Bjorn Helgaas | 5f0dcca | 2009-02-17 14:00:55 -0700 | [diff] [blame] | 802 | list_del(&link->list); |
Ingo Molnar | 36e4309 | 2006-04-27 05:25:00 -0400 | [diff] [blame] | 803 | mutex_unlock(&acpi_link_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | kfree(link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 809 | * modify acpi_isa_irq_penalty[] from cmdline |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | */ |
| 811 | static 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 Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 818 | int new_penalty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 820 | retval = get_option(&str, &irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
| 822 | if (!retval) |
| 823 | break; /* no number found */ |
| 824 | |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 825 | /* see if this is a ISA IRQ */ |
| 826 | if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS)) |
Rafael J. Wysocki | e249714 | 2016-02-24 13:55:38 +0100 | [diff] [blame] | 827 | continue; |
| 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | if (used) |
Sinan Kaya | eeaed4b | 2016-10-24 00:31:30 -0400 | [diff] [blame] | 830 | new_penalty = acpi_isa_irq_penalty[irq] + |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 831 | PIRQ_PENALTY_ISA_USED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | else |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 833 | new_penalty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 835 | acpi_isa_irq_penalty[irq] = new_penalty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | 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 Li | c9c3e45 | 2005-04-01 00:07:31 -0500 | [diff] [blame] | 849 | void acpi_penalize_isa_irq(int irq, int active) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 851 | if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty))) |
Sinan Kaya | eeaed4b | 2016-10-24 00:31:30 -0400 | [diff] [blame] | 852 | acpi_isa_irq_penalty[irq] += |
Sinan Kaya | 5479458 | 2016-06-29 04:27:38 -0400 | [diff] [blame] | 853 | (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
Jiang Liu | 5ebc7603 | 2015-09-17 14:02:45 +0800 | [diff] [blame] | 856 | bool acpi_isa_irq_available(int irq) |
| 857 | { |
Sinan Kaya | 5c5087a | 2016-04-17 13:36:54 -0400 | [diff] [blame] | 858 | return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) || |
Sinan Kaya | 103544d | 2016-04-17 13:36:53 -0400 | [diff] [blame] | 859 | acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS); |
Jiang Liu | 5ebc7603 | 2015-09-17 14:02:45 +0800 | [diff] [blame] | 860 | } |
| 861 | |
Sinan Kaya | f1caa61 | 2016-10-24 00:31:31 -0400 | [diff] [blame] | 862 | void 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 Liu | 5d0ddfe | 2015-08-21 15:36:23 +0800 | [diff] [blame] | 873 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | * 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 | */ |
| 878 | static int __init acpi_irq_isa(char *str) |
| 879 | { |
| 880 | return acpi_irq_penalty_update(str, 1); |
| 881 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | __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 | */ |
| 890 | static int __init acpi_irq_pci(char *str) |
| 891 | { |
| 892 | return acpi_irq_penalty_update(str, 0); |
| 893 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | __setup("acpi_irq_pci=", acpi_irq_pci); |
| 896 | |
| 897 | static int __init acpi_irq_nobalance_set(char *str) |
| 898 | { |
| 899 | acpi_irq_balance = 0; |
| 900 | return 1; |
| 901 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
| 904 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 905 | static int __init acpi_irq_balance_set(char *str) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
| 907 | acpi_irq_balance = 1; |
| 908 | return 1; |
| 909 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 911 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
Rafael J. Wysocki | c3146df2 | 2011-03-12 22:16:51 +0100 | [diff] [blame] | 913 | static struct syscore_ops irqrouter_syscore_ops = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 914 | .resume = irqrouter_resume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | }; |
| 916 | |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 917 | void __init acpi_pci_link_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | if (acpi_noirq) |
Rafael J. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 920 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Bjorn Helgaas | 3283625 | 2008-11-05 16:17:52 -0700 | [diff] [blame] | 922 | 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. Wysocki | 4daeaf6 | 2013-01-30 14:27:37 +0100 | [diff] [blame] | 929 | register_syscore_ops(&irqrouter_syscore_ops); |
| 930 | acpi_scan_add_handler(&pci_link_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |