| 1 | |
| 2 | |
| 3 | * IOAPIC/IOxAPIC/IOSAPIC driver
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| 4 | *
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| 5 | * Copyright (C) 2009 Fujitsu Limited.
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| 6 | * (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
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| 7 | *
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| 8 | * Copyright (C) 2014 Intel Corporation
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| 9 | *
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| 10 | * Based on original drivers/pci/ioapic.c
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| 11 | * Yinghai Lu <[email protected]>
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| 12 | * Jiang Liu <[email protected]>
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| 13 |
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| 14 |
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| 15 | |
| 16 | * This driver manages I/O APICs added by hotplug after boot.
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| 17 | * We try to claim all I/O APIC devices, but those present at boot were
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| 18 | * registered when we parsed the ACPI MADT.
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| 19 |
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| 20 |
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| 21 | #define pr_fmt(fmt) "ACPI: IOAPIC: " fmt
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| 22 |
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| 23 | #include <linux/slab.h>
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| 24 | #include <linux/acpi.h>
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| 25 | #include <linux/pci.h>
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| 26 | #include <acpi/acpi.h>
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| 27 | #include "internal.h"
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| 28 |
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| 29 | struct acpi_pci_ioapic {
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| 30 | acpi_handle root_handle;
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| 31 | acpi_handle handle;
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| 32 | u32 gsi_base;
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| 33 | struct resource res;
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| 34 | struct pci_dev *pdev;
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| 35 | struct list_head list;
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| 36 | };
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| 37 |
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| 38 | static LIST_HEAD(ioapic_list);
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| 39 | static DEFINE_MUTEX(ioapic_list_lock);
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| 40 |
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| 41 | static acpi_status setup_res(struct acpi_resource *acpi_res, void *data)
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| 42 | {
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| 43 | struct resource *res = data;
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| 44 | struct resource_win win;
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| 45 |
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| 46 | |
| 47 | * We might assign this to 'res' later, make sure all pointers are
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| 48 | * cleared before the resource is added to the global list
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| 49 |
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| 50 | memset(&win, 0, sizeof(win));
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| 51 |
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| 52 | res->flags = 0;
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| 53 | if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM))
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| 54 | return AE_OK;
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| 55 |
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| 56 | if (!acpi_dev_resource_memory(acpi_res, res)) {
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| 57 | if (acpi_dev_resource_address_space(acpi_res, &win) ||
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| 58 | acpi_dev_resource_ext_address_space(acpi_res, &win))
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| 59 | *res = win.res;
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| 60 | }
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| 61 | if ((res->flags & IORESOURCE_PREFETCH) ||
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| 62 | (res->flags & IORESOURCE_DISABLED))
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| 63 | res->flags = 0;
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| 64 |
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| 65 | return AE_CTRL_TERMINATE;
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| 66 | }
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| 67 |
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| 68 | static bool acpi_is_ioapic(acpi_handle handle, char **type)
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| 69 | {
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| 70 | acpi_status status;
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| 71 | struct acpi_device_info *info;
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| 72 | char *hid = NULL;
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| 73 | bool match = false;
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| 74 |
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| 75 | if (!acpi_has_method(handle, "_GSB"))
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| 76 | return false;
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| 77 |
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| 78 | status = acpi_get_object_info(handle, &info);
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| 79 | if (ACPI_SUCCESS(status)) {
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| 80 | if (info->valid & ACPI_VALID_HID)
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| 81 | hid = info->hardware_id.string;
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| 82 | if (hid) {
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| 83 | if (strcmp(hid, "ACPI0009") == 0) {
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| 84 | *type = "IOxAPIC";
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| 85 | match = true;
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| 86 | } else if (strcmp(hid, "ACPI000A") == 0) {
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| 87 | *type = "IOAPIC";
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| 88 | match = true;
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| 89 | }
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| 90 | }
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| 91 | kfree(info);
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| 92 | }
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| 93 |
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| 94 | return match;
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| 95 | }
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| 96 |
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| 97 | static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl,
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| 98 | void *context, void **rv)
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| 99 | {
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| 100 | acpi_status status;
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| 101 | unsigned long long gsi_base;
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| 102 | struct acpi_pci_ioapic *ioapic;
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| 103 | struct pci_dev *dev = NULL;
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| 104 | struct resource *res = NULL, *pci_res = NULL, *crs_res;
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| 105 | char *type = NULL;
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| 106 |
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| 107 | if (!acpi_is_ioapic(handle, &type))
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| 108 | return AE_OK;
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| 109 |
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| 110 | mutex_lock(&ioapic_list_lock);
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| 111 | list_for_each_entry(ioapic, &ioapic_list, list)
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| 112 | if (ioapic->handle == handle) {
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| 113 | mutex_unlock(&ioapic_list_lock);
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| 114 | return AE_OK;
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| 115 | }
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| 116 |
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| 117 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsi_base);
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| 118 | if (ACPI_FAILURE(status)) {
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| 119 | acpi_handle_warn(handle, "failed to evaluate _GSB method\n");
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| 120 | goto exit;
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| 121 | }
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| 122 |
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| 123 | ioapic = kzalloc_obj(*ioapic);
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| 124 | if (!ioapic) {
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| 125 | pr_err("cannot allocate memory for new IOAPIC\n");
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| 126 | goto exit;
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| 127 | } else {
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| 128 | ioapic->root_handle = (acpi_handle)context;
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| 129 | ioapic->handle = handle;
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| 130 | ioapic->gsi_base = (u32)gsi_base;
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| 131 | INIT_LIST_HEAD(&ioapic->list);
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| 132 | }
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| 133 |
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| 134 | if (acpi_ioapic_registered(handle, (u32)gsi_base))
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| 135 | goto done;
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| 136 |
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| 137 | dev = acpi_get_pci_dev(handle);
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| 138 | if (dev && pci_resource_len(dev, 0)) {
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| 139 | if (pci_enable_device(dev) < 0)
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| 140 | goto exit_put;
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| 141 | pci_set_master(dev);
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| 142 | if (pci_request_region(dev, 0, type))
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| 143 | goto exit_disable;
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| 144 | pci_res = &dev->resource[0];
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| 145 | ioapic->pdev = dev;
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| 146 | } else {
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| 147 | pci_dev_put(dev);
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| 148 | dev = NULL;
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| 149 | }
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| 150 |
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| 151 | crs_res = &ioapic->res;
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| 152 | acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res);
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| 153 | crs_res->name = type;
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| 154 | crs_res->flags |= IORESOURCE_BUSY;
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| 155 | if (crs_res->flags == 0) {
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| 156 | acpi_handle_warn(handle, "failed to get resource\n");
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| 157 | goto exit_release;
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| 158 | } else if (insert_resource(&iomem_resource, crs_res)) {
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| 159 | acpi_handle_warn(handle, "failed to insert resource\n");
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| 160 | goto exit_release;
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| 161 | }
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| 162 |
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| 163 |
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| 164 | res = pci_res;
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| 165 | if (!res || !res->flags)
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| 166 | res = crs_res;
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| 167 |
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| 168 | if (acpi_register_ioapic(handle, res->start, (u32)gsi_base)) {
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| 169 | acpi_handle_warn(handle, "failed to register IOAPIC\n");
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| 170 | goto exit_release;
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| 171 | }
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| 172 | done:
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| 173 | list_add(&ioapic->list, &ioapic_list);
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| 174 | mutex_unlock(&ioapic_list_lock);
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| 175 |
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| 176 | if (dev)
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| 177 | dev_info(&dev->dev, "%s at %pR, GSI %u\n",
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| 178 | type, res, (u32)gsi_base);
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| 179 | else
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| 180 | acpi_handle_info(handle, "%s at %pR, GSI %u\n",
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| 181 | type, res, (u32)gsi_base);
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| 182 |
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| 183 | return AE_OK;
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| 184 |
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| 185 | exit_release:
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| 186 | if (dev)
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| 187 | pci_release_region(dev, 0);
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| 188 | if (ioapic->res.flags && ioapic->res.parent)
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| 189 | release_resource(&ioapic->res);
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| 190 | exit_disable:
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| 191 | if (dev)
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| 192 | pci_disable_device(dev);
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| 193 | exit_put:
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| 194 | pci_dev_put(dev);
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| 195 | kfree(ioapic);
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| 196 | exit:
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| 197 | mutex_unlock(&ioapic_list_lock);
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| 198 | *(acpi_status *)rv = AE_ERROR;
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| 199 | return AE_OK;
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| 200 | }
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| 201 |
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| 202 | int acpi_ioapic_add(acpi_handle root_handle)
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| 203 | {
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| 204 | acpi_status status, retval = AE_OK;
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| 205 |
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| 206 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
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| 207 | UINT_MAX, handle_ioapic_add, NULL,
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| 208 | root_handle, (void **)&retval);
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| 209 |
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| 210 | return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
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| 211 | }
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| 212 |
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| 213 | void pci_ioapic_remove(struct acpi_pci_root *root)
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| 214 | {
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| 215 | struct acpi_pci_ioapic *ioapic, *tmp;
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| 216 |
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| 217 | mutex_lock(&ioapic_list_lock);
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| 218 | list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
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| 219 | if (root->device->handle != ioapic->root_handle)
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| 220 | continue;
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| 221 | if (ioapic->pdev) {
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| 222 | pci_release_region(ioapic->pdev, 0);
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| 223 | pci_disable_device(ioapic->pdev);
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| 224 | pci_dev_put(ioapic->pdev);
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| 225 | }
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| 226 | }
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| 227 | mutex_unlock(&ioapic_list_lock);
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| 228 | }
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| 229 |
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| 230 | int acpi_ioapic_remove(struct acpi_pci_root *root)
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| 231 | {
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| 232 | int retval = 0;
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| 233 | struct acpi_pci_ioapic *ioapic, *tmp;
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| 234 |
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| 235 | mutex_lock(&ioapic_list_lock);
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| 236 | list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
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| 237 | if (root->device->handle != ioapic->root_handle)
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| 238 | continue;
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| 239 | if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base))
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| 240 | retval = -EBUSY;
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| 241 | if (ioapic->res.flags && ioapic->res.parent)
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| 242 | release_resource(&ioapic->res);
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| 243 | list_del(&ioapic->list);
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| 244 | kfree(ioapic);
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| 245 | }
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| 246 | mutex_unlock(&ioapic_list_lock);
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| 247 |
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| 248 | return retval;
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| 249 | }
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