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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
31struct 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
40static LIST_HEAD(ioapic_list);
41static DEFINE_MUTEX(ioapic_list_lock);
42
43static 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
64static 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
93static 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 }
161done:
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
174exit_release:
175 if (dev)
176 pci_release_region(dev, 0);
177 else
178 release_resource(res);
179exit_disable:
180 if (dev)
181 pci_disable_device(dev);
182exit_put:
183 pci_dev_put(dev);
184exit_free:
185 kfree(ioapic);
186exit:
187 mutex_unlock(&ioapic_list_lock);
188 *(acpi_status *)rv = AE_ERROR;
189 return AE_OK;
190}
191
192int 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
203int 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}
230
