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Commit | Line | Data |
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911e1c9b N |
1 | /* |
2 | * Purpose: Export the firmware instance and label associated with | |
3 | * a pci device to sysfs | |
4 | * Copyright (C) 2010 Dell Inc. | |
5 | * by Narendra K <Narendra_K@dell.com>, | |
6 | * Jordan Hargrave <Jordan_Hargrave@dell.com> | |
7 | * | |
6058989b ND |
8 | * PCI Firmware Specification Revision 3.1 section 4.6.7 (DSM for Naming a |
9 | * PCI or PCI Express Device Under Operating Systems) defines an instance | |
10 | * number and string name. This code retrieves them and exports them to sysfs. | |
11 | * If the system firmware does not provide the ACPI _DSM (Device Specific | |
12 | * Method), then the SMBIOS type 41 instance number and string is exported to | |
13 | * sysfs. | |
14 | * | |
911e1c9b N |
15 | * SMBIOS defines type 41 for onboard pci devices. This code retrieves |
16 | * the instance number and string from the type 41 record and exports | |
17 | * it to sysfs. | |
18 | * | |
19 | * Please see http://linux.dell.com/wiki/index.php/Oss/libnetdevname for more | |
20 | * information. | |
21 | */ | |
22 | ||
23 | #include <linux/dmi.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/pci.h> | |
26 | #include <linux/pci_ids.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/device.h> | |
6058989b ND |
29 | #include <linux/nls.h> |
30 | #include <linux/acpi.h> | |
31 | #include <linux/pci-acpi.h> | |
911e1c9b N |
32 | #include "pci.h" |
33 | ||
6058989b ND |
34 | #define DEVICE_LABEL_DSM 0x07 |
35 | ||
4c859804 | 36 | #ifdef CONFIG_DMI |
911e1c9b N |
37 | enum smbios_attr_enum { |
38 | SMBIOS_ATTR_NONE = 0, | |
39 | SMBIOS_ATTR_LABEL_SHOW, | |
40 | SMBIOS_ATTR_INSTANCE_SHOW, | |
41 | }; | |
42 | ||
3c78bc61 RD |
43 | static size_t find_smbios_instance_string(struct pci_dev *pdev, char *buf, |
44 | enum smbios_attr_enum attribute) | |
911e1c9b N |
45 | { |
46 | const struct dmi_device *dmi; | |
47 | struct dmi_dev_onboard *donboard; | |
48 | int bus; | |
49 | int devfn; | |
50 | ||
51 | bus = pdev->bus->number; | |
52 | devfn = pdev->devfn; | |
53 | ||
54 | dmi = NULL; | |
55 | while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, | |
56 | NULL, dmi)) != NULL) { | |
57 | donboard = dmi->device_data; | |
58 | if (donboard && donboard->bus == bus && | |
59 | donboard->devfn == devfn) { | |
60 | if (buf) { | |
61 | if (attribute == SMBIOS_ATTR_INSTANCE_SHOW) | |
62 | return scnprintf(buf, PAGE_SIZE, | |
63 | "%d\n", | |
64 | donboard->instance); | |
65 | else if (attribute == SMBIOS_ATTR_LABEL_SHOW) | |
66 | return scnprintf(buf, PAGE_SIZE, | |
67 | "%s\n", | |
68 | dmi->name); | |
69 | } | |
70 | return strlen(dmi->name); | |
71 | } | |
72 | } | |
73 | return 0; | |
74 | } | |
75 | ||
3c78bc61 RD |
76 | static umode_t smbios_instance_string_exist(struct kobject *kobj, |
77 | struct attribute *attr, int n) | |
911e1c9b N |
78 | { |
79 | struct device *dev; | |
80 | struct pci_dev *pdev; | |
81 | ||
82 | dev = container_of(kobj, struct device, kobj); | |
83 | pdev = to_pci_dev(dev); | |
84 | ||
85 | return find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE) ? | |
86 | S_IRUGO : 0; | |
87 | } | |
88 | ||
3c78bc61 RD |
89 | static ssize_t smbioslabel_show(struct device *dev, |
90 | struct device_attribute *attr, char *buf) | |
911e1c9b N |
91 | { |
92 | struct pci_dev *pdev; | |
93 | pdev = to_pci_dev(dev); | |
94 | ||
95 | return find_smbios_instance_string(pdev, buf, | |
96 | SMBIOS_ATTR_LABEL_SHOW); | |
97 | } | |
98 | ||
3c78bc61 RD |
99 | static ssize_t smbiosinstance_show(struct device *dev, |
100 | struct device_attribute *attr, char *buf) | |
911e1c9b N |
101 | { |
102 | struct pci_dev *pdev; | |
103 | pdev = to_pci_dev(dev); | |
104 | ||
105 | return find_smbios_instance_string(pdev, buf, | |
106 | SMBIOS_ATTR_INSTANCE_SHOW); | |
107 | } | |
108 | ||
109 | static struct device_attribute smbios_attr_label = { | |
763e9db9 | 110 | .attr = {.name = "label", .mode = 0444}, |
911e1c9b N |
111 | .show = smbioslabel_show, |
112 | }; | |
113 | ||
114 | static struct device_attribute smbios_attr_instance = { | |
763e9db9 | 115 | .attr = {.name = "index", .mode = 0444}, |
911e1c9b N |
116 | .show = smbiosinstance_show, |
117 | }; | |
118 | ||
119 | static struct attribute *smbios_attributes[] = { | |
120 | &smbios_attr_label.attr, | |
121 | &smbios_attr_instance.attr, | |
122 | NULL, | |
123 | }; | |
124 | ||
125 | static struct attribute_group smbios_attr_group = { | |
126 | .attrs = smbios_attributes, | |
127 | .is_visible = smbios_instance_string_exist, | |
128 | }; | |
129 | ||
3c78bc61 | 130 | static int pci_create_smbiosname_file(struct pci_dev *pdev) |
911e1c9b | 131 | { |
6058989b | 132 | return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group); |
911e1c9b N |
133 | } |
134 | ||
3c78bc61 | 135 | static void pci_remove_smbiosname_file(struct pci_dev *pdev) |
911e1c9b N |
136 | { |
137 | sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group); | |
138 | } | |
4c859804 | 139 | #else |
3c78bc61 | 140 | static inline int pci_create_smbiosname_file(struct pci_dev *pdev) |
6058989b ND |
141 | { |
142 | return -1; | |
143 | } | |
144 | ||
3c78bc61 | 145 | static inline void pci_remove_smbiosname_file(struct pci_dev *pdev) |
07eefe1c | 146 | { |
07eefe1c | 147 | } |
4c859804 | 148 | #endif |
07eefe1c | 149 | |
4c859804 | 150 | #ifdef CONFIG_ACPI |
6058989b ND |
151 | static const char device_label_dsm_uuid[] = { |
152 | 0xD0, 0x37, 0xC9, 0xE5, 0x53, 0x35, 0x7A, 0x4D, | |
153 | 0x91, 0x17, 0xEA, 0x4D, 0x19, 0xC3, 0x43, 0x4D | |
154 | }; | |
155 | ||
156 | enum acpi_attr_enum { | |
6058989b ND |
157 | ACPI_ATTR_LABEL_SHOW, |
158 | ACPI_ATTR_INDEX_SHOW, | |
159 | }; | |
160 | ||
161 | static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf) | |
162 | { | |
163 | int len; | |
1d0fcef7 JL |
164 | len = utf16s_to_utf8s((const wchar_t *)obj->string.pointer, |
165 | obj->string.length, | |
6058989b ND |
166 | UTF16_LITTLE_ENDIAN, |
167 | buf, PAGE_SIZE); | |
168 | buf[len] = '\n'; | |
169 | } | |
170 | ||
3c78bc61 RD |
171 | static int dsm_get_label(struct device *dev, char *buf, |
172 | enum acpi_attr_enum attr) | |
6058989b | 173 | { |
1d0fcef7 JL |
174 | acpi_handle handle; |
175 | union acpi_object *obj, *tmp; | |
176 | int len = -1; | |
177 | ||
178 | handle = ACPI_HANDLE(dev); | |
179 | if (!handle) | |
6058989b ND |
180 | return -1; |
181 | ||
1d0fcef7 JL |
182 | obj = acpi_evaluate_dsm(handle, device_label_dsm_uuid, 0x2, |
183 | DEVICE_LABEL_DSM, NULL); | |
184 | if (!obj) | |
185 | return -1; | |
186 | ||
187 | tmp = obj->package.elements; | |
188 | if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 2 && | |
189 | tmp[0].type == ACPI_TYPE_INTEGER && | |
190 | tmp[1].type == ACPI_TYPE_STRING) { | |
2fc59fe2 JL |
191 | /* |
192 | * The second string element is optional even when | |
193 | * this _DSM is implemented; when not implemented, | |
194 | * this entry must return a null string. | |
195 | */ | |
196 | if (attr == ACPI_ATTR_INDEX_SHOW) | |
197 | scnprintf(buf, PAGE_SIZE, "%llu\n", tmp->integer.value); | |
198 | else if (attr == ACPI_ATTR_LABEL_SHOW) | |
199 | dsm_label_utf16s_to_utf8s(tmp + 1, buf); | |
200 | len = strlen(buf) > 0 ? strlen(buf) : -1; | |
6058989b | 201 | } |
54e5bb46 | 202 | |
1d0fcef7 | 203 | ACPI_FREE(obj); |
54e5bb46 | 204 | |
1d0fcef7 | 205 | return len; |
6058989b ND |
206 | } |
207 | ||
3c78bc61 | 208 | static bool device_has_dsm(struct device *dev) |
6058989b ND |
209 | { |
210 | acpi_handle handle; | |
6058989b | 211 | |
3a83f992 | 212 | handle = ACPI_HANDLE(dev); |
6058989b | 213 | if (!handle) |
2fc59fe2 | 214 | return false; |
6058989b | 215 | |
2fc59fe2 JL |
216 | return !!acpi_check_dsm(handle, device_label_dsm_uuid, 0x2, |
217 | 1 << DEVICE_LABEL_DSM); | |
6058989b ND |
218 | } |
219 | ||
3c78bc61 RD |
220 | static umode_t acpi_index_string_exist(struct kobject *kobj, |
221 | struct attribute *attr, int n) | |
6058989b ND |
222 | { |
223 | struct device *dev; | |
224 | ||
225 | dev = container_of(kobj, struct device, kobj); | |
226 | ||
227 | if (device_has_dsm(dev)) | |
228 | return S_IRUGO; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
3c78bc61 RD |
233 | static ssize_t acpilabel_show(struct device *dev, |
234 | struct device_attribute *attr, char *buf) | |
6058989b | 235 | { |
1d0fcef7 | 236 | return dsm_get_label(dev, buf, ACPI_ATTR_LABEL_SHOW); |
6058989b ND |
237 | } |
238 | ||
3c78bc61 RD |
239 | static ssize_t acpiindex_show(struct device *dev, |
240 | struct device_attribute *attr, char *buf) | |
6058989b | 241 | { |
1d0fcef7 | 242 | return dsm_get_label(dev, buf, ACPI_ATTR_INDEX_SHOW); |
6058989b ND |
243 | } |
244 | ||
245 | static struct device_attribute acpi_attr_label = { | |
246 | .attr = {.name = "label", .mode = 0444}, | |
247 | .show = acpilabel_show, | |
248 | }; | |
249 | ||
250 | static struct device_attribute acpi_attr_index = { | |
251 | .attr = {.name = "acpi_index", .mode = 0444}, | |
252 | .show = acpiindex_show, | |
253 | }; | |
254 | ||
255 | static struct attribute *acpi_attributes[] = { | |
256 | &acpi_attr_label.attr, | |
257 | &acpi_attr_index.attr, | |
258 | NULL, | |
259 | }; | |
260 | ||
261 | static struct attribute_group acpi_attr_group = { | |
262 | .attrs = acpi_attributes, | |
263 | .is_visible = acpi_index_string_exist, | |
264 | }; | |
265 | ||
3c78bc61 | 266 | static int pci_create_acpi_index_label_files(struct pci_dev *pdev) |
6058989b ND |
267 | { |
268 | return sysfs_create_group(&pdev->dev.kobj, &acpi_attr_group); | |
269 | } | |
270 | ||
3c78bc61 | 271 | static int pci_remove_acpi_index_label_files(struct pci_dev *pdev) |
6058989b ND |
272 | { |
273 | sysfs_remove_group(&pdev->dev.kobj, &acpi_attr_group); | |
274 | return 0; | |
275 | } | |
4c859804 | 276 | #else |
3c78bc61 | 277 | static inline int pci_create_acpi_index_label_files(struct pci_dev *pdev) |
4c859804 BH |
278 | { |
279 | return -1; | |
280 | } | |
281 | ||
3c78bc61 | 282 | static inline int pci_remove_acpi_index_label_files(struct pci_dev *pdev) |
4c859804 BH |
283 | { |
284 | return -1; | |
285 | } | |
286 | ||
3c78bc61 | 287 | static inline bool device_has_dsm(struct device *dev) |
4c859804 BH |
288 | { |
289 | return false; | |
290 | } | |
6058989b ND |
291 | #endif |
292 | ||
911e1c9b N |
293 | void pci_create_firmware_label_files(struct pci_dev *pdev) |
294 | { | |
6058989b ND |
295 | if (device_has_dsm(&pdev->dev)) |
296 | pci_create_acpi_index_label_files(pdev); | |
297 | else | |
298 | pci_create_smbiosname_file(pdev); | |
911e1c9b N |
299 | } |
300 | ||
301 | void pci_remove_firmware_label_files(struct pci_dev *pdev) | |
302 | { | |
6058989b ND |
303 | if (device_has_dsm(&pdev->dev)) |
304 | pci_remove_acpi_index_label_files(pdev); | |
305 | else | |
306 | pci_remove_smbiosname_file(pdev); | |
911e1c9b | 307 | } |