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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Export the firmware instance and label associated with a PCI device to
4 * sysfs
5 *
6 * Copyright (C) 2010 Dell Inc.
7 * by Narendra K <Narendra_K@dell.com>,
8 * Jordan Hargrave <Jordan_Hargrave@dell.com>
9 *
10 * PCI Firmware Specification Revision 3.1 section 4.6.7 (DSM for Naming a
11 * PCI or PCI Express Device Under Operating Systems) defines an instance
12 * number and string name. This code retrieves them and exports them to sysfs.
13 * If the system firmware does not provide the ACPI _DSM (Device Specific
14 * Method), then the SMBIOS type 41 instance number and string is exported to
15 * sysfs.
16 *
17 * SMBIOS defines type 41 for onboard pci devices. This code retrieves
18 * the instance number and string from the type 41 record and exports
19 * it to sysfs.
20 *
21 * Please see http://linux.dell.com/files/biosdevname/ for more
22 * information.
23 */
24
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
37enum smbios_attr_enum {
38 SMBIOS_ATTR_NONE = 0,
39 SMBIOS_ATTR_LABEL_SHOW,
40 SMBIOS_ATTR_INSTANCE_SHOW,
41};
42
43static 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
79static 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
92static 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
102static 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
112static struct device_attribute smbios_attr_label = {
113 .attr = {.name = "label", .mode = 0444},
114 .show = smbioslabel_show,
115};
116
117static struct device_attribute smbios_attr_instance = {
118 .attr = {.name = "index", .mode = 0444},
119 .show = smbiosinstance_show,
120};
121
122static struct attribute *smbios_attributes[] = {
123 &smbios_attr_label.attr,
124 &smbios_attr_instance.attr,
125 NULL,
126};
127
128static const struct attribute_group smbios_attr_group = {
129 .attrs = smbios_attributes,
130 .is_visible = smbios_instance_string_exist,
131};
132
133static int pci_create_smbiosname_file(struct pci_dev *pdev)
134{
135 return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group);
136}
137
138static void pci_remove_smbiosname_file(struct pci_dev *pdev)
139{
140 sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
141}
142#else
143static inline int pci_create_smbiosname_file(struct pci_dev *pdev)
144{
145 return -1;
146}
147
148static inline void pci_remove_smbiosname_file(struct pci_dev *pdev)
149{
150}
151#endif
152
153#ifdef CONFIG_ACPI
154enum acpi_attr_enum {
155 ACPI_ATTR_LABEL_SHOW,
156 ACPI_ATTR_INDEX_SHOW,
157};
158
159static 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
169static 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 * The second string element is optional even when
192 * this _DSM is implemented; when not implemented,
193 * this entry must return a null string.
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
212static 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
224static 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
237static 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
243static 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
249static struct device_attribute acpi_attr_label = {
250 .attr = {.name = "label", .mode = 0444},
251 .show = acpilabel_show,
252};
253
254static struct device_attribute acpi_attr_index = {
255 .attr = {.name = "acpi_index", .mode = 0444},
256 .show = acpiindex_show,
257};
258
259static struct attribute *acpi_attributes[] = {
260 &acpi_attr_label.attr,
261 &acpi_attr_index.attr,
262 NULL,
263};
264
265static const struct attribute_group acpi_attr_group = {
266 .attrs = acpi_attributes,
267 .is_visible = acpi_index_string_exist,
268};
269
270static 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
275static 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
281static inline int pci_create_acpi_index_label_files(struct pci_dev *pdev)
282{
283 return -1;
284}
285
286static inline int pci_remove_acpi_index_label_files(struct pci_dev *pdev)
287{
288 return -1;
289}
290
291static inline bool device_has_dsm(struct device *dev)
292{
293 return false;
294}
295#endif
296
297void 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
305void 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}
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 *
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 *
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>
29#include <linux/nls.h>
30#include <linux/acpi.h>
31#include <linux/pci-acpi.h>
32#include <acpi/acpi_bus.h>
33#include "pci.h"
34
35#define DEVICE_LABEL_DSM 0x07
36
37#ifndef CONFIG_DMI
38
39static inline int
40pci_create_smbiosname_file(struct pci_dev *pdev)
41{
42 return -1;
43}
44
45static inline void
46pci_remove_smbiosname_file(struct pci_dev *pdev)
47{
48}
49
50#else
51
52enum smbios_attr_enum {
53 SMBIOS_ATTR_NONE = 0,
54 SMBIOS_ATTR_LABEL_SHOW,
55 SMBIOS_ATTR_INSTANCE_SHOW,
56};
57
58static size_t
59find_smbios_instance_string(struct pci_dev *pdev, char *buf,
60 enum smbios_attr_enum attribute)
61{
62 const struct dmi_device *dmi;
63 struct dmi_dev_onboard *donboard;
64 int bus;
65 int devfn;
66
67 bus = pdev->bus->number;
68 devfn = pdev->devfn;
69
70 dmi = NULL;
71 while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD,
72 NULL, dmi)) != NULL) {
73 donboard = dmi->device_data;
74 if (donboard && donboard->bus == bus &&
75 donboard->devfn == devfn) {
76 if (buf) {
77 if (attribute == SMBIOS_ATTR_INSTANCE_SHOW)
78 return scnprintf(buf, PAGE_SIZE,
79 "%d\n",
80 donboard->instance);
81 else if (attribute == SMBIOS_ATTR_LABEL_SHOW)
82 return scnprintf(buf, PAGE_SIZE,
83 "%s\n",
84 dmi->name);
85 }
86 return strlen(dmi->name);
87 }
88 }
89 return 0;
90}
91
92static umode_t
93smbios_instance_string_exist(struct kobject *kobj, struct attribute *attr,
94 int n)
95{
96 struct device *dev;
97 struct pci_dev *pdev;
98
99 dev = container_of(kobj, struct device, kobj);
100 pdev = to_pci_dev(dev);
101
102 return find_smbios_instance_string(pdev, NULL, SMBIOS_ATTR_NONE) ?
103 S_IRUGO : 0;
104}
105
106static ssize_t
107smbioslabel_show(struct device *dev, struct device_attribute *attr, char *buf)
108{
109 struct pci_dev *pdev;
110 pdev = to_pci_dev(dev);
111
112 return find_smbios_instance_string(pdev, buf,
113 SMBIOS_ATTR_LABEL_SHOW);
114}
115
116static ssize_t
117smbiosinstance_show(struct device *dev,
118 struct device_attribute *attr, char *buf)
119{
120 struct pci_dev *pdev;
121 pdev = to_pci_dev(dev);
122
123 return find_smbios_instance_string(pdev, buf,
124 SMBIOS_ATTR_INSTANCE_SHOW);
125}
126
127static struct device_attribute smbios_attr_label = {
128 .attr = {.name = "label", .mode = 0444},
129 .show = smbioslabel_show,
130};
131
132static struct device_attribute smbios_attr_instance = {
133 .attr = {.name = "index", .mode = 0444},
134 .show = smbiosinstance_show,
135};
136
137static struct attribute *smbios_attributes[] = {
138 &smbios_attr_label.attr,
139 &smbios_attr_instance.attr,
140 NULL,
141};
142
143static struct attribute_group smbios_attr_group = {
144 .attrs = smbios_attributes,
145 .is_visible = smbios_instance_string_exist,
146};
147
148static int
149pci_create_smbiosname_file(struct pci_dev *pdev)
150{
151 return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group);
152}
153
154static void
155pci_remove_smbiosname_file(struct pci_dev *pdev)
156{
157 sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
158}
159
160#endif
161
162#ifndef CONFIG_ACPI
163
164static inline int
165pci_create_acpi_index_label_files(struct pci_dev *pdev)
166{
167 return -1;
168}
169
170static inline int
171pci_remove_acpi_index_label_files(struct pci_dev *pdev)
172{
173 return -1;
174}
175
176static inline bool
177device_has_dsm(struct device *dev)
178{
179 return false;
180}
181
182#else
183
184static const char device_label_dsm_uuid[] = {
185 0xD0, 0x37, 0xC9, 0xE5, 0x53, 0x35, 0x7A, 0x4D,
186 0x91, 0x17, 0xEA, 0x4D, 0x19, 0xC3, 0x43, 0x4D
187};
188
189enum acpi_attr_enum {
190 ACPI_ATTR_NONE = 0,
191 ACPI_ATTR_LABEL_SHOW,
192 ACPI_ATTR_INDEX_SHOW,
193};
194
195static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf)
196{
197 int len;
198 len = utf16s_to_utf8s((const wchar_t *)obj->
199 package.elements[1].string.pointer,
200 obj->package.elements[1].string.length,
201 UTF16_LITTLE_ENDIAN,
202 buf, PAGE_SIZE);
203 buf[len] = '\n';
204}
205
206static int
207dsm_get_label(acpi_handle handle, int func,
208 struct acpi_buffer *output,
209 char *buf, enum acpi_attr_enum attribute)
210{
211 struct acpi_object_list input;
212 union acpi_object params[4];
213 union acpi_object *obj;
214 int len = 0;
215
216 int err;
217
218 input.count = 4;
219 input.pointer = params;
220 params[0].type = ACPI_TYPE_BUFFER;
221 params[0].buffer.length = sizeof(device_label_dsm_uuid);
222 params[0].buffer.pointer = (char *)device_label_dsm_uuid;
223 params[1].type = ACPI_TYPE_INTEGER;
224 params[1].integer.value = 0x02;
225 params[2].type = ACPI_TYPE_INTEGER;
226 params[2].integer.value = func;
227 params[3].type = ACPI_TYPE_PACKAGE;
228 params[3].package.count = 0;
229 params[3].package.elements = NULL;
230
231 err = acpi_evaluate_object(handle, "_DSM", &input, output);
232 if (err)
233 return -1;
234
235 obj = (union acpi_object *)output->pointer;
236
237 switch (obj->type) {
238 case ACPI_TYPE_PACKAGE:
239 if (obj->package.count != 2)
240 break;
241 len = obj->package.elements[0].integer.value;
242 if (buf) {
243 if (attribute == ACPI_ATTR_INDEX_SHOW)
244 scnprintf(buf, PAGE_SIZE, "%llu\n",
245 obj->package.elements[0].integer.value);
246 else if (attribute == ACPI_ATTR_LABEL_SHOW)
247 dsm_label_utf16s_to_utf8s(obj, buf);
248 kfree(output->pointer);
249 return strlen(buf);
250 }
251 kfree(output->pointer);
252 return len;
253 break;
254 default:
255 kfree(output->pointer);
256 }
257 return -1;
258}
259
260static bool
261device_has_dsm(struct device *dev)
262{
263 acpi_handle handle;
264 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
265
266 handle = DEVICE_ACPI_HANDLE(dev);
267
268 if (!handle)
269 return FALSE;
270
271 if (dsm_get_label(handle, DEVICE_LABEL_DSM, &output, NULL,
272 ACPI_ATTR_NONE) > 0)
273 return TRUE;
274
275 return FALSE;
276}
277
278static umode_t
279acpi_index_string_exist(struct kobject *kobj, struct attribute *attr, int n)
280{
281 struct device *dev;
282
283 dev = container_of(kobj, struct device, kobj);
284
285 if (device_has_dsm(dev))
286 return S_IRUGO;
287
288 return 0;
289}
290
291static ssize_t
292acpilabel_show(struct device *dev, struct device_attribute *attr, char *buf)
293{
294 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
295 acpi_handle handle;
296 int length;
297
298 handle = DEVICE_ACPI_HANDLE(dev);
299
300 if (!handle)
301 return -1;
302
303 length = dsm_get_label(handle, DEVICE_LABEL_DSM,
304 &output, buf, ACPI_ATTR_LABEL_SHOW);
305
306 if (length < 1)
307 return -1;
308
309 return length;
310}
311
312static ssize_t
313acpiindex_show(struct device *dev, struct device_attribute *attr, char *buf)
314{
315 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
316 acpi_handle handle;
317 int length;
318
319 handle = DEVICE_ACPI_HANDLE(dev);
320
321 if (!handle)
322 return -1;
323
324 length = dsm_get_label(handle, DEVICE_LABEL_DSM,
325 &output, buf, ACPI_ATTR_INDEX_SHOW);
326
327 if (length < 0)
328 return -1;
329
330 return length;
331
332}
333
334static struct device_attribute acpi_attr_label = {
335 .attr = {.name = "label", .mode = 0444},
336 .show = acpilabel_show,
337};
338
339static struct device_attribute acpi_attr_index = {
340 .attr = {.name = "acpi_index", .mode = 0444},
341 .show = acpiindex_show,
342};
343
344static struct attribute *acpi_attributes[] = {
345 &acpi_attr_label.attr,
346 &acpi_attr_index.attr,
347 NULL,
348};
349
350static struct attribute_group acpi_attr_group = {
351 .attrs = acpi_attributes,
352 .is_visible = acpi_index_string_exist,
353};
354
355static int
356pci_create_acpi_index_label_files(struct pci_dev *pdev)
357{
358 return sysfs_create_group(&pdev->dev.kobj, &acpi_attr_group);
359}
360
361static int
362pci_remove_acpi_index_label_files(struct pci_dev *pdev)
363{
364 sysfs_remove_group(&pdev->dev.kobj, &acpi_attr_group);
365 return 0;
366}
367#endif
368
369void pci_create_firmware_label_files(struct pci_dev *pdev)
370{
371 if (device_has_dsm(&pdev->dev))
372 pci_create_acpi_index_label_files(pdev);
373 else
374 pci_create_smbiosname_file(pdev);
375}
376
377void pci_remove_firmware_label_files(struct pci_dev *pdev)
378{
379 if (device_has_dsm(&pdev->dev))
380 pci_remove_acpi_index_label_files(pdev);
381 else
382 pci_remove_smbiosname_file(pdev);
383}