| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * IOAPIC/IOxAPIC/IOSAPIC driver |
| 4 | * |
| 5 | * Copyright (C) 2009 Fujitsu Limited. |
| 6 | * (c) Copyright 2009 Hewlett-Packard Development Company, L.P. |
| 7 | * |
| 8 | * Copyright (C) 2014 Intel Corporation |
| 9 | * |
| 10 | * Based on original drivers/pci/ioapic.c |
| 11 | * Yinghai Lu <yinghai@kernel.org> |
| 12 | * Jiang Liu <jiang.liu@intel.com> |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * This driver manages I/O APICs added by hotplug after boot. |
| 17 | * We try to claim all I/O APIC devices, but those present at boot were |
| 18 | * registered when we parsed the ACPI MADT. |
| 19 | */ |
| 20 | |
| 21 | #define pr_fmt(fmt) "ACPI: IOAPIC: " fmt |
| 22 | |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/acpi.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <acpi/acpi.h> |
| 27 | #include "internal.h" |
| 28 | |
| 29 | struct acpi_pci_ioapic { |
| 30 | acpi_handle root_handle; |
| 31 | acpi_handle handle; |
| 32 | u32 gsi_base; |
| 33 | struct resource res; |
| 34 | struct pci_dev *pdev; |
| 35 | struct list_head list; |
| 36 | }; |
| 37 | |
| 38 | static LIST_HEAD(ioapic_list); |
| 39 | static DEFINE_MUTEX(ioapic_list_lock); |
| 40 | |
| 41 | static acpi_status setup_res(struct acpi_resource *acpi_res, void *data) |
| 42 | { |
| 43 | struct resource *res = data; |
| 44 | struct resource_win win; |
| 45 | |
| 46 | /* |
| 47 | * We might assign this to 'res' later, make sure all pointers are |
| 48 | * cleared before the resource is added to the global list |
| 49 | */ |
| 50 | memset(&win, 0, sizeof(win)); |
| 51 | |
| 52 | res->flags = 0; |
| 53 | if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM)) |
| 54 | return AE_OK; |
| 55 | |
| 56 | if (!acpi_dev_resource_memory(acpi_res, res)) { |
| 57 | if (acpi_dev_resource_address_space(acpi_res, &win) || |
| 58 | acpi_dev_resource_ext_address_space(acpi_res, &win)) |
| 59 | *res = win.res; |
| 60 | } |
| 61 | if ((res->flags & IORESOURCE_PREFETCH) || |
| 62 | (res->flags & IORESOURCE_DISABLED)) |
| 63 | res->flags = 0; |
| 64 | |
| 65 | return AE_CTRL_TERMINATE; |
| 66 | } |
| 67 | |
| 68 | static bool acpi_is_ioapic(acpi_handle handle, char **type) |
| 69 | { |
| 70 | acpi_status status; |
| 71 | struct acpi_device_info *info; |
| 72 | char *hid = NULL; |
| 73 | bool match = false; |
| 74 | |
| 75 | if (!acpi_has_method(handle, "_GSB")) |
| 76 | return false; |
| 77 | |
| 78 | status = acpi_get_object_info(handle, &info); |
| 79 | if (ACPI_SUCCESS(status)) { |
| 80 | if (info->valid & ACPI_VALID_HID) |
| 81 | hid = info->hardware_id.string; |
| 82 | if (hid) { |
| 83 | if (strcmp(hid, "ACPI0009") == 0) { |
| 84 | *type = "IOxAPIC"; |
| 85 | match = true; |
| 86 | } else if (strcmp(hid, "ACPI000A") == 0) { |
| 87 | *type = "IOAPIC"; |
| 88 | match = true; |
| 89 | } |
| 90 | } |
| 91 | kfree(info); |
| 92 | } |
| 93 | |
| 94 | return match; |
| 95 | } |
| 96 | |
| 97 | static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl, |
| 98 | void *context, void **rv) |
| 99 | { |
| 100 | acpi_status status; |
| 101 | unsigned long long gsi_base; |
| 102 | struct acpi_pci_ioapic *ioapic; |
| 103 | struct pci_dev *dev = NULL; |
| 104 | struct resource *res = NULL, *pci_res = NULL, *crs_res; |
| 105 | char *type = NULL; |
| 106 | |
| 107 | if (!acpi_is_ioapic(handle, &type)) |
| 108 | return AE_OK; |
| 109 | |
| 110 | mutex_lock(&ioapic_list_lock); |
| 111 | list_for_each_entry(ioapic, &ioapic_list, list) |
| 112 | if (ioapic->handle == handle) { |
| 113 | mutex_unlock(&ioapic_list_lock); |
| 114 | return AE_OK; |
| 115 | } |
| 116 | |
| 117 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsi_base); |
| 118 | if (ACPI_FAILURE(status)) { |
| 119 | acpi_handle_warn(handle, "failed to evaluate _GSB method\n"); |
| 120 | goto exit; |
| 121 | } |
| 122 | |
| 123 | ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL); |
| 124 | if (!ioapic) { |
| 125 | pr_err("cannot allocate memory for new IOAPIC\n"); |
| 126 | goto exit; |
| 127 | } else { |
| 128 | ioapic->root_handle = (acpi_handle)context; |
| 129 | ioapic->handle = handle; |
| 130 | ioapic->gsi_base = (u32)gsi_base; |
| 131 | INIT_LIST_HEAD(&ioapic->list); |
| 132 | } |
| 133 | |
| 134 | if (acpi_ioapic_registered(handle, (u32)gsi_base)) |
| 135 | goto done; |
| 136 | |
| 137 | dev = acpi_get_pci_dev(handle); |
| 138 | if (dev && pci_resource_len(dev, 0)) { |
| 139 | if (pci_enable_device(dev) < 0) |
| 140 | goto exit_put; |
| 141 | pci_set_master(dev); |
| 142 | if (pci_request_region(dev, 0, type)) |
| 143 | goto exit_disable; |
| 144 | pci_res = &dev->resource[0]; |
| 145 | ioapic->pdev = dev; |
| 146 | } else { |
| 147 | pci_dev_put(dev); |
| 148 | dev = NULL; |
| 149 | } |
| 150 | |
| 151 | crs_res = &ioapic->res; |
| 152 | acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res); |
| 153 | crs_res->name = type; |
| 154 | crs_res->flags |= IORESOURCE_BUSY; |
| 155 | if (crs_res->flags == 0) { |
| 156 | acpi_handle_warn(handle, "failed to get resource\n"); |
| 157 | goto exit_release; |
| 158 | } else if (insert_resource(&iomem_resource, crs_res)) { |
| 159 | acpi_handle_warn(handle, "failed to insert resource\n"); |
| 160 | goto exit_release; |
| 161 | } |
| 162 | |
| 163 | /* try pci resource first, then "_CRS" resource */ |
| 164 | res = pci_res; |
| 165 | if (!res || !res->flags) |
| 166 | res = crs_res; |
| 167 | |
| 168 | if (acpi_register_ioapic(handle, res->start, (u32)gsi_base)) { |
| 169 | acpi_handle_warn(handle, "failed to register IOAPIC\n"); |
| 170 | goto exit_release; |
| 171 | } |
| 172 | done: |
| 173 | list_add(&ioapic->list, &ioapic_list); |
| 174 | mutex_unlock(&ioapic_list_lock); |
| 175 | |
| 176 | if (dev) |
| 177 | dev_info(&dev->dev, "%s at %pR, GSI %u\n", |
| 178 | type, res, (u32)gsi_base); |
| 179 | else |
| 180 | acpi_handle_info(handle, "%s at %pR, GSI %u\n", |
| 181 | type, res, (u32)gsi_base); |
| 182 | |
| 183 | return AE_OK; |
| 184 | |
| 185 | exit_release: |
| 186 | if (dev) |
| 187 | pci_release_region(dev, 0); |
| 188 | if (ioapic->res.flags && ioapic->res.parent) |
| 189 | release_resource(&ioapic->res); |
| 190 | exit_disable: |
| 191 | if (dev) |
| 192 | pci_disable_device(dev); |
| 193 | exit_put: |
| 194 | pci_dev_put(dev); |
| 195 | kfree(ioapic); |
| 196 | exit: |
| 197 | mutex_unlock(&ioapic_list_lock); |
| 198 | *(acpi_status *)rv = AE_ERROR; |
| 199 | return AE_OK; |
| 200 | } |
| 201 | |
| 202 | int acpi_ioapic_add(acpi_handle root_handle) |
| 203 | { |
| 204 | acpi_status status, retval = AE_OK; |
| 205 | |
| 206 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle, |
| 207 | UINT_MAX, handle_ioapic_add, NULL, |
| 208 | root_handle, (void **)&retval); |
| 209 | |
| 210 | return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV; |
| 211 | } |
| 212 | |
| 213 | void pci_ioapic_remove(struct acpi_pci_root *root) |
| 214 | { |
| 215 | struct acpi_pci_ioapic *ioapic, *tmp; |
| 216 | |
| 217 | mutex_lock(&ioapic_list_lock); |
| 218 | list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) { |
| 219 | if (root->device->handle != ioapic->root_handle) |
| 220 | continue; |
| 221 | if (ioapic->pdev) { |
| 222 | pci_release_region(ioapic->pdev, 0); |
| 223 | pci_disable_device(ioapic->pdev); |
| 224 | pci_dev_put(ioapic->pdev); |
| 225 | } |
| 226 | } |
| 227 | mutex_unlock(&ioapic_list_lock); |
| 228 | } |
| 229 | |
| 230 | int acpi_ioapic_remove(struct acpi_pci_root *root) |
| 231 | { |
| 232 | int retval = 0; |
| 233 | struct acpi_pci_ioapic *ioapic, *tmp; |
| 234 | |
| 235 | mutex_lock(&ioapic_list_lock); |
| 236 | list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) { |
| 237 | if (root->device->handle != ioapic->root_handle) |
| 238 | continue; |
| 239 | if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base)) |
| 240 | retval = -EBUSY; |
| 241 | if (ioapic->res.flags && ioapic->res.parent) |
| 242 | release_resource(&ioapic->res); |
| 243 | list_del(&ioapic->list); |
| 244 | kfree(ioapic); |
| 245 | } |
| 246 | mutex_unlock(&ioapic_list_lock); |
| 247 | |
| 248 | return retval; |
| 249 | } |