This source file includes following definitions.
- find_smbios_instance_string
- smbios_instance_string_exist
- smbioslabel_show
- smbiosinstance_show
- pci_create_smbiosname_file
- pci_remove_smbiosname_file
- pci_create_smbiosname_file
- pci_remove_smbiosname_file
- dsm_label_utf16s_to_utf8s
- dsm_get_label
- device_has_dsm
- acpi_index_string_exist
- acpilabel_show
- acpiindex_show
- pci_create_acpi_index_label_files
- pci_remove_acpi_index_label_files
- pci_create_acpi_index_label_files
- pci_remove_acpi_index_label_files
- device_has_dsm
- pci_create_firmware_label_files
- pci_remove_firmware_label_files
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25 #include <linux/dmi.h>
26 #include <linux/sysfs.h>
27 #include <linux/pci.h>
28 #include <linux/pci_ids.h>
29 #include <linux/module.h>
30 #include <linux/device.h>
31 #include <linux/nls.h>
32 #include <linux/acpi.h>
33 #include <linux/pci-acpi.h>
34 #include "pci.h"
35
36 #ifdef CONFIG_DMI
37 enum smbios_attr_enum {
38 SMBIOS_ATTR_NONE = 0,
39 SMBIOS_ATTR_LABEL_SHOW,
40 SMBIOS_ATTR_INSTANCE_SHOW,
41 };
42
43 static size_t find_smbios_instance_string(struct pci_dev *pdev, char *buf,
44 enum smbios_attr_enum attribute)
45 {
46 const struct dmi_device *dmi;
47 struct dmi_dev_onboard *donboard;
48 int domain_nr;
49 int bus;
50 int devfn;
51
52 domain_nr = pci_domain_nr(pdev->bus);
53 bus = pdev->bus->number;
54 devfn = pdev->devfn;
55
56 dmi = NULL;
57 while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD,
58 NULL, dmi)) != NULL) {
59 donboard = dmi->device_data;
60 if (donboard && donboard->segment == domain_nr &&
61 donboard->bus == bus &&
62 donboard->devfn == devfn) {
63 if (buf) {
64 if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
65 return scnprintf(buf, PAGE_SIZE,
66 "%d\n",
67 donboard->instance);
68 else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
69 return scnprintf(buf, PAGE_SIZE,
70 "%s\n",
71 dmi->name);
72 }
73 return strlen(dmi->name);
74 }
75 }
76 return 0;
77 }
78
79 static umode_t smbios_instance_string_exist(struct kobject *kobj,
80 struct attribute *attr, int n)
81 {
82 struct device *dev;
83 struct pci_dev *pdev;
84
85 dev = kobj_to_dev(kobj);
86 pdev = to_pci_dev(dev);
87
88 return find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE) ?
89 S_IRUGO : 0;
90 }
91
92 static ssize_t smbioslabel_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94 {
95 struct pci_dev *pdev;
96 pdev = to_pci_dev(dev);
97
98 return find_smbios_instance_string(pdev, buf,
99 SMBIOS_ATTR_LABEL_SHOW);
100 }
101
102 static ssize_t smbiosinstance_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
104 {
105 struct pci_dev *pdev;
106 pdev = to_pci_dev(dev);
107
108 return find_smbios_instance_string(pdev, buf,
109 SMBIOS_ATTR_INSTANCE_SHOW);
110 }
111
112 static struct device_attribute smbios_attr_label = {
113 .attr = {.name = "label", .mode = 0444},
114 .show = smbioslabel_show,
115 };
116
117 static struct device_attribute smbios_attr_instance = {
118 .attr = {.name = "index", .mode = 0444},
119 .show = smbiosinstance_show,
120 };
121
122 static struct attribute *smbios_attributes[] = {
123 &smbios_attr_label.attr,
124 &smbios_attr_instance.attr,
125 NULL,
126 };
127
128 static const struct attribute_group smbios_attr_group = {
129 .attrs = smbios_attributes,
130 .is_visible = smbios_instance_string_exist,
131 };
132
133 static int pci_create_smbiosname_file(struct pci_dev *pdev)
134 {
135 return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group);
136 }
137
138 static void pci_remove_smbiosname_file(struct pci_dev *pdev)
139 {
140 sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
141 }
142 #else
143 static inline int pci_create_smbiosname_file(struct pci_dev *pdev)
144 {
145 return -1;
146 }
147
148 static inline void pci_remove_smbiosname_file(struct pci_dev *pdev)
149 {
150 }
151 #endif
152
153 #ifdef CONFIG_ACPI
154 enum acpi_attr_enum {
155 ACPI_ATTR_LABEL_SHOW,
156 ACPI_ATTR_INDEX_SHOW,
157 };
158
159 static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf)
160 {
161 int len;
162 len = utf16s_to_utf8s((const wchar_t *)obj->buffer.pointer,
163 obj->buffer.length,
164 UTF16_LITTLE_ENDIAN,
165 buf, PAGE_SIZE);
166 buf[len] = '\n';
167 }
168
169 static int dsm_get_label(struct device *dev, char *buf,
170 enum acpi_attr_enum attr)
171 {
172 acpi_handle handle;
173 union acpi_object *obj, *tmp;
174 int len = -1;
175
176 handle = ACPI_HANDLE(dev);
177 if (!handle)
178 return -1;
179
180 obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 0x2,
181 DEVICE_LABEL_DSM, NULL);
182 if (!obj)
183 return -1;
184
185 tmp = obj->package.elements;
186 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 2 &&
187 tmp[0].type == ACPI_TYPE_INTEGER &&
188 (tmp[1].type == ACPI_TYPE_STRING ||
189 tmp[1].type == ACPI_TYPE_BUFFER)) {
190
191
192
193
194
195 if (attr == ACPI_ATTR_INDEX_SHOW) {
196 scnprintf(buf, PAGE_SIZE, "%llu\n", tmp->integer.value);
197 } else if (attr == ACPI_ATTR_LABEL_SHOW) {
198 if (tmp[1].type == ACPI_TYPE_STRING)
199 scnprintf(buf, PAGE_SIZE, "%s\n",
200 tmp[1].string.pointer);
201 else if (tmp[1].type == ACPI_TYPE_BUFFER)
202 dsm_label_utf16s_to_utf8s(tmp + 1, buf);
203 }
204 len = strlen(buf) > 0 ? strlen(buf) : -1;
205 }
206
207 ACPI_FREE(obj);
208
209 return len;
210 }
211
212 static bool device_has_dsm(struct device *dev)
213 {
214 acpi_handle handle;
215
216 handle = ACPI_HANDLE(dev);
217 if (!handle)
218 return false;
219
220 return !!acpi_check_dsm(handle, &pci_acpi_dsm_guid, 0x2,
221 1 << DEVICE_LABEL_DSM);
222 }
223
224 static umode_t acpi_index_string_exist(struct kobject *kobj,
225 struct attribute *attr, int n)
226 {
227 struct device *dev;
228
229 dev = kobj_to_dev(kobj);
230
231 if (device_has_dsm(dev))
232 return S_IRUGO;
233
234 return 0;
235 }
236
237 static ssize_t acpilabel_show(struct device *dev,
238 struct device_attribute *attr, char *buf)
239 {
240 return dsm_get_label(dev, buf, ACPI_ATTR_LABEL_SHOW);
241 }
242
243 static ssize_t acpiindex_show(struct device *dev,
244 struct device_attribute *attr, char *buf)
245 {
246 return dsm_get_label(dev, buf, ACPI_ATTR_INDEX_SHOW);
247 }
248
249 static struct device_attribute acpi_attr_label = {
250 .attr = {.name = "label", .mode = 0444},
251 .show = acpilabel_show,
252 };
253
254 static struct device_attribute acpi_attr_index = {
255 .attr = {.name = "acpi_index", .mode = 0444},
256 .show = acpiindex_show,
257 };
258
259 static struct attribute *acpi_attributes[] = {
260 &acpi_attr_label.attr,
261 &acpi_attr_index.attr,
262 NULL,
263 };
264
265 static const struct attribute_group acpi_attr_group = {
266 .attrs = acpi_attributes,
267 .is_visible = acpi_index_string_exist,
268 };
269
270 static int pci_create_acpi_index_label_files(struct pci_dev *pdev)
271 {
272 return sysfs_create_group(&pdev->dev.kobj, &acpi_attr_group);
273 }
274
275 static int pci_remove_acpi_index_label_files(struct pci_dev *pdev)
276 {
277 sysfs_remove_group(&pdev->dev.kobj, &acpi_attr_group);
278 return 0;
279 }
280 #else
281 static inline int pci_create_acpi_index_label_files(struct pci_dev *pdev)
282 {
283 return -1;
284 }
285
286 static inline int pci_remove_acpi_index_label_files(struct pci_dev *pdev)
287 {
288 return -1;
289 }
290
291 static inline bool device_has_dsm(struct device *dev)
292 {
293 return false;
294 }
295 #endif
296
297 void pci_create_firmware_label_files(struct pci_dev *pdev)
298 {
299 if (device_has_dsm(&pdev->dev))
300 pci_create_acpi_index_label_files(pdev);
301 else
302 pci_create_smbiosname_file(pdev);
303 }
304
305 void pci_remove_firmware_label_files(struct pci_dev *pdev)
306 {
307 if (device_has_dsm(&pdev->dev))
308 pci_remove_acpi_index_label_files(pdev);
309 else
310 pci_remove_smbiosname_file(pdev);
311 }