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