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(ares: acpi_res, IORESOURCE_MEM)) |
54 | return AE_OK; |
55 | |
56 | if (!acpi_dev_resource_memory(ares: acpi_res, res)) { |
57 | if (acpi_dev_resource_address_space(ares: acpi_res, win: &win) || |
58 | acpi_dev_resource_ext_address_space(ares: acpi_res, win: &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, name: "_GSB" )) |
76 | return false; |
77 | |
78 | status = acpi_get_object_info(object: handle, return_buffer: &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(objp: 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: &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(lock: &ioapic_list_lock); |
114 | return AE_OK; |
115 | } |
116 | |
117 | status = acpi_evaluate_integer(handle, pathname: "_GSB" , NULL, data: &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(size: 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(list: &ioapic->list); |
132 | } |
133 | |
134 | if (acpi_ioapic_registered(handle, gsi_base: (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(device: handle, METHOD_NAME__CRS, user_function: setup_res, context: 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(parent: &iomem_resource, new: 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, phys_addr: res->start, gsi_base: (u32)gsi_base)) { |
169 | acpi_handle_warn(handle, "failed to register IOAPIC\n" ); |
170 | goto exit_release; |
171 | } |
172 | done: |
173 | list_add(new: &ioapic->list, head: &ioapic_list); |
174 | mutex_unlock(lock: &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(new: &ioapic->res); |
190 | exit_disable: |
191 | if (dev) |
192 | pci_disable_device(dev); |
193 | exit_put: |
194 | pci_dev_put(dev); |
195 | kfree(objp: ioapic); |
196 | exit: |
197 | mutex_unlock(lock: &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, start_object: root_handle, |
207 | UINT_MAX, descending_callback: handle_ioapic_add, NULL, |
208 | context: root_handle, return_value: (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(dev: ioapic->pdev); |
224 | pci_dev_put(dev: ioapic->pdev); |
225 | } |
226 | } |
227 | mutex_unlock(lock: &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(handle: ioapic->handle, gsi_base: ioapic->gsi_base)) |
240 | retval = -EBUSY; |
241 | if (ioapic->res.flags && ioapic->res.parent) |
242 | release_resource(new: &ioapic->res); |
243 | list_del(entry: &ioapic->list); |
244 | kfree(objp: ioapic); |
245 | } |
246 | mutex_unlock(lock: &ioapic_list_lock); |
247 | |
248 | return retval; |
249 | } |
250 | |