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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/pci-sysfs.c | |
3 | * | |
4 | * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com> | |
5 | * (C) Copyright 2002-2004 IBM Corp. | |
6 | * (C) Copyright 2003 Matthew Wilcox | |
7 | * (C) Copyright 2003 Hewlett-Packard | |
8 | * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com> | |
9 | * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com> | |
10 | * | |
11 | * File attributes for PCI devices | |
12 | * | |
13 | * Modeled after usb's driverfs.c | |
14 | * | |
15 | */ | |
16 | ||
17 | ||
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/pci.h> | |
20 | #include <linux/stat.h> | |
21 | #include <linux/topology.h> | |
22 | #include <linux/mm.h> | |
aa0ac365 | 23 | #include <linux/capability.h> |
7d715a6c | 24 | #include <linux/pci-aspm.h> |
1da177e4 LT |
25 | #include "pci.h" |
26 | ||
27 | static int sysfs_initialized; /* = 0 */ | |
28 | ||
29 | /* show configuration fields */ | |
30 | #define pci_config_attr(field, format_string) \ | |
31 | static ssize_t \ | |
e404e274 | 32 | field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
33 | { \ |
34 | struct pci_dev *pdev; \ | |
35 | \ | |
36 | pdev = to_pci_dev (dev); \ | |
37 | return sprintf (buf, format_string, pdev->field); \ | |
38 | } | |
39 | ||
40 | pci_config_attr(vendor, "0x%04x\n"); | |
41 | pci_config_attr(device, "0x%04x\n"); | |
42 | pci_config_attr(subsystem_vendor, "0x%04x\n"); | |
43 | pci_config_attr(subsystem_device, "0x%04x\n"); | |
44 | pci_config_attr(class, "0x%06x\n"); | |
45 | pci_config_attr(irq, "%u\n"); | |
46 | ||
bdee9d98 DT |
47 | static ssize_t broken_parity_status_show(struct device *dev, |
48 | struct device_attribute *attr, | |
49 | char *buf) | |
50 | { | |
51 | struct pci_dev *pdev = to_pci_dev(dev); | |
52 | return sprintf (buf, "%u\n", pdev->broken_parity_status); | |
53 | } | |
54 | ||
55 | static ssize_t broken_parity_status_store(struct device *dev, | |
56 | struct device_attribute *attr, | |
57 | const char *buf, size_t count) | |
58 | { | |
59 | struct pci_dev *pdev = to_pci_dev(dev); | |
60 | ssize_t consumed = -EINVAL; | |
61 | ||
62 | if ((count > 0) && (*buf == '0' || *buf == '1')) { | |
63 | pdev->broken_parity_status = *buf == '1' ? 1 : 0; | |
64 | consumed = count; | |
65 | } | |
66 | return consumed; | |
67 | } | |
68 | ||
4327edf6 AC |
69 | static ssize_t local_cpus_show(struct device *dev, |
70 | struct device_attribute *attr, char *buf) | |
1da177e4 | 71 | { |
4327edf6 AC |
72 | cpumask_t mask; |
73 | int len; | |
74 | ||
75 | mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); | |
76 | len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
39106dcf MT |
77 | buf[len++] = '\n'; |
78 | buf[len] = '\0'; | |
79 | return len; | |
80 | } | |
81 | ||
82 | ||
83 | static ssize_t local_cpulist_show(struct device *dev, | |
84 | struct device_attribute *attr, char *buf) | |
85 | { | |
86 | cpumask_t mask; | |
87 | int len; | |
88 | ||
89 | mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); | |
90 | len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask); | |
91 | buf[len++] = '\n'; | |
92 | buf[len] = '\0'; | |
93 | return len; | |
1da177e4 LT |
94 | } |
95 | ||
96 | /* show resources */ | |
97 | static ssize_t | |
e404e274 | 98 | resource_show(struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
99 | { |
100 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
101 | char * str = buf; | |
102 | int i; | |
103 | int max = 7; | |
e31dd6e4 | 104 | resource_size_t start, end; |
1da177e4 LT |
105 | |
106 | if (pci_dev->subordinate) | |
107 | max = DEVICE_COUNT_RESOURCE; | |
108 | ||
109 | for (i = 0; i < max; i++) { | |
2311b1f2 ME |
110 | struct resource *res = &pci_dev->resource[i]; |
111 | pci_resource_to_user(pci_dev, i, res, &start, &end); | |
112 | str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n", | |
113 | (unsigned long long)start, | |
114 | (unsigned long long)end, | |
115 | (unsigned long long)res->flags); | |
1da177e4 LT |
116 | } |
117 | return (str - buf); | |
118 | } | |
119 | ||
87c8a443 | 120 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
9888549e GKH |
121 | { |
122 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
123 | ||
124 | return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n", | |
125 | pci_dev->vendor, pci_dev->device, | |
126 | pci_dev->subsystem_vendor, pci_dev->subsystem_device, | |
127 | (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), | |
128 | (u8)(pci_dev->class)); | |
129 | } | |
bae94d02 IPG |
130 | |
131 | static ssize_t is_enabled_store(struct device *dev, | |
132 | struct device_attribute *attr, const char *buf, | |
133 | size_t count) | |
9f125d30 | 134 | { |
bae94d02 | 135 | ssize_t result = -EINVAL; |
9f125d30 AV |
136 | struct pci_dev *pdev = to_pci_dev(dev); |
137 | ||
138 | /* this can crash the machine when done on the "wrong" device */ | |
139 | if (!capable(CAP_SYS_ADMIN)) | |
140 | return count; | |
141 | ||
bae94d02 IPG |
142 | if (*buf == '0') { |
143 | if (atomic_read(&pdev->enable_cnt) != 0) | |
144 | pci_disable_device(pdev); | |
145 | else | |
146 | result = -EIO; | |
147 | } else if (*buf == '1') | |
148 | result = pci_enable_device(pdev); | |
9f125d30 | 149 | |
bae94d02 IPG |
150 | return result < 0 ? result : count; |
151 | } | |
152 | ||
153 | static ssize_t is_enabled_show(struct device *dev, | |
154 | struct device_attribute *attr, char *buf) | |
155 | { | |
156 | struct pci_dev *pdev; | |
9f125d30 | 157 | |
bae94d02 IPG |
158 | pdev = to_pci_dev (dev); |
159 | return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt)); | |
9f125d30 AV |
160 | } |
161 | ||
81bb0e19 BG |
162 | #ifdef CONFIG_NUMA |
163 | static ssize_t | |
164 | numa_node_show(struct device *dev, struct device_attribute *attr, char *buf) | |
165 | { | |
166 | return sprintf (buf, "%d\n", dev->numa_node); | |
167 | } | |
168 | #endif | |
169 | ||
fe97064c BG |
170 | static ssize_t |
171 | msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf) | |
172 | { | |
173 | struct pci_dev *pdev = to_pci_dev(dev); | |
174 | ||
175 | if (!pdev->subordinate) | |
176 | return 0; | |
177 | ||
178 | return sprintf (buf, "%u\n", | |
179 | !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)); | |
180 | } | |
181 | ||
182 | static ssize_t | |
183 | msi_bus_store(struct device *dev, struct device_attribute *attr, | |
184 | const char *buf, size_t count) | |
185 | { | |
186 | struct pci_dev *pdev = to_pci_dev(dev); | |
187 | ||
188 | /* bad things may happen if the no_msi flag is changed | |
189 | * while some drivers are loaded */ | |
190 | if (!capable(CAP_SYS_ADMIN)) | |
191 | return count; | |
192 | ||
193 | if (!pdev->subordinate) | |
194 | return count; | |
195 | ||
196 | if (*buf == '0') { | |
197 | pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; | |
198 | dev_warn(&pdev->dev, "forced subordinate bus to not support MSI," | |
199 | " bad things could happen.\n"); | |
200 | } | |
201 | ||
202 | if (*buf == '1') { | |
203 | pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; | |
204 | dev_warn(&pdev->dev, "forced subordinate bus to support MSI," | |
205 | " bad things could happen.\n"); | |
206 | } | |
207 | ||
208 | return count; | |
209 | } | |
9888549e | 210 | |
1da177e4 LT |
211 | struct device_attribute pci_dev_attrs[] = { |
212 | __ATTR_RO(resource), | |
213 | __ATTR_RO(vendor), | |
214 | __ATTR_RO(device), | |
215 | __ATTR_RO(subsystem_vendor), | |
216 | __ATTR_RO(subsystem_device), | |
217 | __ATTR_RO(class), | |
218 | __ATTR_RO(irq), | |
219 | __ATTR_RO(local_cpus), | |
39106dcf | 220 | __ATTR_RO(local_cpulist), |
9888549e | 221 | __ATTR_RO(modalias), |
81bb0e19 BG |
222 | #ifdef CONFIG_NUMA |
223 | __ATTR_RO(numa_node), | |
224 | #endif | |
9f125d30 | 225 | __ATTR(enable, 0600, is_enabled_show, is_enabled_store), |
bdee9d98 DT |
226 | __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR), |
227 | broken_parity_status_show,broken_parity_status_store), | |
fe97064c | 228 | __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store), |
1da177e4 LT |
229 | __ATTR_NULL, |
230 | }; | |
231 | ||
232 | static ssize_t | |
91a69029 ZR |
233 | pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
234 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
235 | { |
236 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
237 | unsigned int size = 64; | |
238 | loff_t init_off = off; | |
4c0619ad | 239 | u8 *data = (u8*) buf; |
1da177e4 LT |
240 | |
241 | /* Several chips lock up trying to read undefined config space */ | |
242 | if (capable(CAP_SYS_ADMIN)) { | |
243 | size = dev->cfg_size; | |
244 | } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { | |
245 | size = 128; | |
246 | } | |
247 | ||
248 | if (off > size) | |
249 | return 0; | |
250 | if (off + count > size) { | |
251 | size -= off; | |
252 | count = size; | |
253 | } else { | |
254 | size = count; | |
255 | } | |
256 | ||
4c0619ad SS |
257 | if ((off & 1) && size) { |
258 | u8 val; | |
e04b0ea2 | 259 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 260 | data[off - init_off] = val; |
1da177e4 | 261 | off++; |
4c0619ad SS |
262 | size--; |
263 | } | |
264 | ||
265 | if ((off & 3) && size > 2) { | |
266 | u16 val; | |
e04b0ea2 | 267 | pci_user_read_config_word(dev, off, &val); |
4c0619ad SS |
268 | data[off - init_off] = val & 0xff; |
269 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
270 | off += 2; | |
271 | size -= 2; | |
1da177e4 LT |
272 | } |
273 | ||
274 | while (size > 3) { | |
4c0619ad | 275 | u32 val; |
e04b0ea2 | 276 | pci_user_read_config_dword(dev, off, &val); |
4c0619ad SS |
277 | data[off - init_off] = val & 0xff; |
278 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
279 | data[off - init_off + 2] = (val >> 16) & 0xff; | |
280 | data[off - init_off + 3] = (val >> 24) & 0xff; | |
1da177e4 LT |
281 | off += 4; |
282 | size -= 4; | |
283 | } | |
284 | ||
4c0619ad SS |
285 | if (size >= 2) { |
286 | u16 val; | |
e04b0ea2 | 287 | pci_user_read_config_word(dev, off, &val); |
4c0619ad SS |
288 | data[off - init_off] = val & 0xff; |
289 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
290 | off += 2; | |
291 | size -= 2; | |
292 | } | |
293 | ||
294 | if (size > 0) { | |
295 | u8 val; | |
e04b0ea2 | 296 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 297 | data[off - init_off] = val; |
1da177e4 LT |
298 | off++; |
299 | --size; | |
300 | } | |
301 | ||
302 | return count; | |
303 | } | |
304 | ||
305 | static ssize_t | |
91a69029 ZR |
306 | pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
307 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
308 | { |
309 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
310 | unsigned int size = count; | |
311 | loff_t init_off = off; | |
4c0619ad | 312 | u8 *data = (u8*) buf; |
1da177e4 LT |
313 | |
314 | if (off > dev->cfg_size) | |
315 | return 0; | |
316 | if (off + count > dev->cfg_size) { | |
317 | size = dev->cfg_size - off; | |
318 | count = size; | |
319 | } | |
4c0619ad SS |
320 | |
321 | if ((off & 1) && size) { | |
e04b0ea2 | 322 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 | 323 | off++; |
4c0619ad | 324 | size--; |
1da177e4 | 325 | } |
4c0619ad SS |
326 | |
327 | if ((off & 3) && size > 2) { | |
328 | u16 val = data[off - init_off]; | |
329 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 330 | pci_user_write_config_word(dev, off, val); |
4c0619ad SS |
331 | off += 2; |
332 | size -= 2; | |
333 | } | |
1da177e4 LT |
334 | |
335 | while (size > 3) { | |
4c0619ad SS |
336 | u32 val = data[off - init_off]; |
337 | val |= (u32) data[off - init_off + 1] << 8; | |
338 | val |= (u32) data[off - init_off + 2] << 16; | |
339 | val |= (u32) data[off - init_off + 3] << 24; | |
e04b0ea2 | 340 | pci_user_write_config_dword(dev, off, val); |
1da177e4 LT |
341 | off += 4; |
342 | size -= 4; | |
343 | } | |
4c0619ad SS |
344 | |
345 | if (size >= 2) { | |
346 | u16 val = data[off - init_off]; | |
347 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 348 | pci_user_write_config_word(dev, off, val); |
4c0619ad SS |
349 | off += 2; |
350 | size -= 2; | |
351 | } | |
1da177e4 | 352 | |
4c0619ad | 353 | if (size) { |
e04b0ea2 | 354 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 LT |
355 | off++; |
356 | --size; | |
357 | } | |
358 | ||
359 | return count; | |
360 | } | |
361 | ||
94e61088 BH |
362 | static ssize_t |
363 | pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr, | |
364 | char *buf, loff_t off, size_t count) | |
365 | { | |
366 | struct pci_dev *dev = | |
367 | to_pci_dev(container_of(kobj, struct device, kobj)); | |
368 | int end; | |
369 | int ret; | |
370 | ||
371 | if (off > bin_attr->size) | |
372 | count = 0; | |
373 | else if (count > bin_attr->size - off) | |
374 | count = bin_attr->size - off; | |
375 | end = off + count; | |
376 | ||
377 | while (off < end) { | |
378 | ret = dev->vpd->ops->read(dev, off, end - off, buf); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | buf += ret; | |
382 | off += ret; | |
383 | } | |
384 | ||
385 | return count; | |
386 | } | |
387 | ||
388 | static ssize_t | |
389 | pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr, | |
390 | char *buf, loff_t off, size_t count) | |
391 | { | |
392 | struct pci_dev *dev = | |
393 | to_pci_dev(container_of(kobj, struct device, kobj)); | |
394 | int end; | |
395 | int ret; | |
396 | ||
397 | if (off > bin_attr->size) | |
398 | count = 0; | |
399 | else if (count > bin_attr->size - off) | |
400 | count = bin_attr->size - off; | |
401 | end = off + count; | |
402 | ||
403 | while (off < end) { | |
404 | ret = dev->vpd->ops->write(dev, off, end - off, buf); | |
405 | if (ret < 0) | |
406 | return ret; | |
407 | buf += ret; | |
408 | off += ret; | |
409 | } | |
410 | ||
411 | return count; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | #ifdef HAVE_PCI_LEGACY |
415 | /** | |
416 | * pci_read_legacy_io - read byte(s) from legacy I/O port space | |
417 | * @kobj: kobject corresponding to file to read from | |
418 | * @buf: buffer to store results | |
419 | * @off: offset into legacy I/O port space | |
420 | * @count: number of bytes to read | |
421 | * | |
422 | * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
423 | * callback routine (pci_legacy_read). | |
424 | */ | |
425 | ssize_t | |
91a69029 ZR |
426 | pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr, |
427 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
428 | { |
429 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 430 | struct device, |
1da177e4 LT |
431 | kobj)); |
432 | ||
433 | /* Only support 1, 2 or 4 byte accesses */ | |
434 | if (count != 1 && count != 2 && count != 4) | |
435 | return -EINVAL; | |
436 | ||
437 | return pci_legacy_read(bus, off, (u32 *)buf, count); | |
438 | } | |
439 | ||
440 | /** | |
441 | * pci_write_legacy_io - write byte(s) to legacy I/O port space | |
442 | * @kobj: kobject corresponding to file to read from | |
443 | * @buf: buffer containing value to be written | |
444 | * @off: offset into legacy I/O port space | |
445 | * @count: number of bytes to write | |
446 | * | |
447 | * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
448 | * callback routine (pci_legacy_write). | |
449 | */ | |
450 | ssize_t | |
91a69029 ZR |
451 | pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr, |
452 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
453 | { |
454 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 455 | struct device, |
1da177e4 LT |
456 | kobj)); |
457 | /* Only support 1, 2 or 4 byte accesses */ | |
458 | if (count != 1 && count != 2 && count != 4) | |
459 | return -EINVAL; | |
460 | ||
461 | return pci_legacy_write(bus, off, *(u32 *)buf, count); | |
462 | } | |
463 | ||
464 | /** | |
465 | * pci_mmap_legacy_mem - map legacy PCI memory into user memory space | |
466 | * @kobj: kobject corresponding to device to be mapped | |
467 | * @attr: struct bin_attribute for this file | |
468 | * @vma: struct vm_area_struct passed to mmap | |
469 | * | |
470 | * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap | |
471 | * legacy memory space (first meg of bus space) into application virtual | |
472 | * memory space. | |
473 | */ | |
474 | int | |
475 | pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr, | |
476 | struct vm_area_struct *vma) | |
477 | { | |
478 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 479 | struct device, |
1da177e4 LT |
480 | kobj)); |
481 | ||
482 | return pci_mmap_legacy_page_range(bus, vma); | |
483 | } | |
484 | #endif /* HAVE_PCI_LEGACY */ | |
485 | ||
486 | #ifdef HAVE_PCI_MMAP | |
487 | /** | |
488 | * pci_mmap_resource - map a PCI resource into user memory space | |
489 | * @kobj: kobject for mapping | |
490 | * @attr: struct bin_attribute for the file being mapped | |
491 | * @vma: struct vm_area_struct passed into the mmap | |
45aec1ae | 492 | * @write_combine: 1 for write_combine mapping |
1da177e4 LT |
493 | * |
494 | * Use the regular PCI mapping routines to map a PCI resource into userspace. | |
1da177e4 LT |
495 | */ |
496 | static int | |
497 | pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, | |
45aec1ae | 498 | struct vm_area_struct *vma, int write_combine) |
1da177e4 LT |
499 | { |
500 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, | |
501 | struct device, kobj)); | |
502 | struct resource *res = (struct resource *)attr->private; | |
503 | enum pci_mmap_state mmap_type; | |
e31dd6e4 | 504 | resource_size_t start, end; |
2311b1f2 | 505 | int i; |
1da177e4 | 506 | |
2311b1f2 ME |
507 | for (i = 0; i < PCI_ROM_RESOURCE; i++) |
508 | if (res == &pdev->resource[i]) | |
509 | break; | |
510 | if (i >= PCI_ROM_RESOURCE) | |
511 | return -ENODEV; | |
512 | ||
513 | /* pci_mmap_page_range() expects the same kind of entry as coming | |
514 | * from /proc/bus/pci/ which is a "user visible" value. If this is | |
515 | * different from the resource itself, arch will do necessary fixup. | |
516 | */ | |
517 | pci_resource_to_user(pdev, i, res, &start, &end); | |
518 | vma->vm_pgoff += start >> PAGE_SHIFT; | |
1da177e4 LT |
519 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; |
520 | ||
45aec1ae | 521 | return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); |
522 | } | |
523 | ||
524 | static int | |
525 | pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr, | |
526 | struct vm_area_struct *vma) | |
527 | { | |
528 | return pci_mmap_resource(kobj, attr, vma, 0); | |
529 | } | |
530 | ||
531 | static int | |
532 | pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr, | |
533 | struct vm_area_struct *vma) | |
534 | { | |
535 | return pci_mmap_resource(kobj, attr, vma, 1); | |
1da177e4 LT |
536 | } |
537 | ||
b19441af GKH |
538 | /** |
539 | * pci_remove_resource_files - cleanup resource files | |
540 | * @dev: dev to cleanup | |
541 | * | |
542 | * If we created resource files for @dev, remove them from sysfs and | |
543 | * free their resources. | |
544 | */ | |
545 | static void | |
546 | pci_remove_resource_files(struct pci_dev *pdev) | |
547 | { | |
548 | int i; | |
549 | ||
550 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
551 | struct bin_attribute *res_attr; | |
552 | ||
553 | res_attr = pdev->res_attr[i]; | |
554 | if (res_attr) { | |
555 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
556 | kfree(res_attr); | |
557 | } | |
45aec1ae | 558 | |
559 | res_attr = pdev->res_attr_wc[i]; | |
560 | if (res_attr) { | |
561 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
562 | kfree(res_attr); | |
563 | } | |
b19441af GKH |
564 | } |
565 | } | |
566 | ||
45aec1ae | 567 | static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) |
568 | { | |
569 | /* allocate attribute structure, piggyback attribute name */ | |
570 | int name_len = write_combine ? 13 : 10; | |
571 | struct bin_attribute *res_attr; | |
572 | int retval; | |
573 | ||
574 | res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); | |
575 | if (res_attr) { | |
576 | char *res_attr_name = (char *)(res_attr + 1); | |
577 | ||
578 | if (write_combine) { | |
579 | pdev->res_attr_wc[num] = res_attr; | |
580 | sprintf(res_attr_name, "resource%d_wc", num); | |
581 | res_attr->mmap = pci_mmap_resource_wc; | |
582 | } else { | |
583 | pdev->res_attr[num] = res_attr; | |
584 | sprintf(res_attr_name, "resource%d", num); | |
585 | res_attr->mmap = pci_mmap_resource_uc; | |
586 | } | |
587 | res_attr->attr.name = res_attr_name; | |
588 | res_attr->attr.mode = S_IRUSR | S_IWUSR; | |
589 | res_attr->size = pci_resource_len(pdev, num); | |
590 | res_attr->private = &pdev->resource[num]; | |
591 | retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); | |
592 | } else | |
593 | retval = -ENOMEM; | |
594 | ||
595 | return retval; | |
596 | } | |
597 | ||
1da177e4 LT |
598 | /** |
599 | * pci_create_resource_files - create resource files in sysfs for @dev | |
600 | * @dev: dev in question | |
601 | * | |
602 | * Walk the resources in @dev creating files for each resource available. | |
603 | */ | |
b19441af | 604 | static int pci_create_resource_files(struct pci_dev *pdev) |
1da177e4 LT |
605 | { |
606 | int i; | |
b19441af | 607 | int retval; |
1da177e4 LT |
608 | |
609 | /* Expose the PCI resources from this device as files */ | |
610 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
1da177e4 LT |
611 | |
612 | /* skip empty resources */ | |
613 | if (!pci_resource_len(pdev, i)) | |
614 | continue; | |
615 | ||
45aec1ae | 616 | retval = pci_create_attr(pdev, i, 0); |
617 | /* for prefetchable resources, create a WC mappable file */ | |
618 | if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) | |
619 | retval = pci_create_attr(pdev, i, 1); | |
620 | ||
621 | if (retval) { | |
622 | pci_remove_resource_files(pdev); | |
623 | return retval; | |
1da177e4 LT |
624 | } |
625 | } | |
b19441af | 626 | return 0; |
1da177e4 LT |
627 | } |
628 | #else /* !HAVE_PCI_MMAP */ | |
b19441af | 629 | static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; } |
1da177e4 LT |
630 | static inline void pci_remove_resource_files(struct pci_dev *dev) { return; } |
631 | #endif /* HAVE_PCI_MMAP */ | |
632 | ||
633 | /** | |
634 | * pci_write_rom - used to enable access to the PCI ROM display | |
635 | * @kobj: kernel object handle | |
636 | * @buf: user input | |
637 | * @off: file offset | |
638 | * @count: number of byte in input | |
639 | * | |
640 | * writing anything except 0 enables it | |
641 | */ | |
642 | static ssize_t | |
91a69029 ZR |
643 | pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
644 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
645 | { |
646 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
647 | ||
648 | if ((off == 0) && (*buf == '0') && (count == 2)) | |
649 | pdev->rom_attr_enabled = 0; | |
650 | else | |
651 | pdev->rom_attr_enabled = 1; | |
652 | ||
653 | return count; | |
654 | } | |
655 | ||
656 | /** | |
657 | * pci_read_rom - read a PCI ROM | |
658 | * @kobj: kernel object handle | |
659 | * @buf: where to put the data we read from the ROM | |
660 | * @off: file offset | |
661 | * @count: number of bytes to read | |
662 | * | |
663 | * Put @count bytes starting at @off into @buf from the ROM in the PCI | |
664 | * device corresponding to @kobj. | |
665 | */ | |
666 | static ssize_t | |
91a69029 ZR |
667 | pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
668 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
669 | { |
670 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
671 | void __iomem *rom; | |
672 | size_t size; | |
673 | ||
674 | if (!pdev->rom_attr_enabled) | |
675 | return -EINVAL; | |
676 | ||
677 | rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ | |
678 | if (!rom) | |
679 | return 0; | |
680 | ||
681 | if (off >= size) | |
682 | count = 0; | |
683 | else { | |
684 | if (off + count > size) | |
685 | count = size - off; | |
686 | ||
687 | memcpy_fromio(buf, rom + off, count); | |
688 | } | |
689 | pci_unmap_rom(pdev, rom); | |
690 | ||
691 | return count; | |
692 | } | |
693 | ||
694 | static struct bin_attribute pci_config_attr = { | |
695 | .attr = { | |
696 | .name = "config", | |
697 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 LT |
698 | }, |
699 | .size = 256, | |
700 | .read = pci_read_config, | |
701 | .write = pci_write_config, | |
702 | }; | |
703 | ||
704 | static struct bin_attribute pcie_config_attr = { | |
705 | .attr = { | |
706 | .name = "config", | |
707 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 LT |
708 | }, |
709 | .size = 4096, | |
710 | .read = pci_read_config, | |
711 | .write = pci_write_config, | |
712 | }; | |
713 | ||
a2cd52ca | 714 | int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev) |
575e3348 | 715 | { |
a2cd52ca | 716 | return 0; |
575e3348 ME |
717 | } |
718 | ||
b19441af | 719 | int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) |
1da177e4 | 720 | { |
94e61088 | 721 | struct bin_attribute *attr = NULL; |
b19441af GKH |
722 | int retval; |
723 | ||
1da177e4 LT |
724 | if (!sysfs_initialized) |
725 | return -EACCES; | |
726 | ||
727 | if (pdev->cfg_size < 4096) | |
b19441af | 728 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); |
1da177e4 | 729 | else |
b19441af GKH |
730 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); |
731 | if (retval) | |
732 | goto err; | |
1da177e4 | 733 | |
94e61088 BH |
734 | /* If the device has VPD, try to expose it in sysfs. */ |
735 | if (pdev->vpd) { | |
736 | attr = kzalloc(sizeof(*attr), GFP_ATOMIC); | |
737 | if (attr) { | |
738 | pdev->vpd->attr = attr; | |
739 | attr->size = pdev->vpd->ops->get_size(pdev); | |
740 | attr->attr.name = "vpd"; | |
741 | attr->attr.mode = S_IRUGO | S_IWUSR; | |
742 | attr->read = pci_read_vpd; | |
743 | attr->write = pci_write_vpd; | |
744 | retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); | |
745 | if (retval) | |
746 | goto err_vpd; | |
747 | } else { | |
748 | retval = -ENOMEM; | |
749 | goto err_config_file; | |
750 | } | |
751 | } | |
752 | ||
b19441af GKH |
753 | retval = pci_create_resource_files(pdev); |
754 | if (retval) | |
94e61088 | 755 | goto err_vpd_file; |
1da177e4 LT |
756 | |
757 | /* If the device has a ROM, try to expose it in sysfs. */ | |
40ee9e9f JB |
758 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE) || |
759 | (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) { | |
94e61088 BH |
760 | attr = kzalloc(sizeof(*attr), GFP_ATOMIC); |
761 | if (attr) { | |
762 | pdev->rom_attr = attr; | |
763 | attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE); | |
764 | attr->attr.name = "rom"; | |
765 | attr->attr.mode = S_IRUSR; | |
766 | attr->read = pci_read_rom; | |
767 | attr->write = pci_write_rom; | |
768 | retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); | |
b19441af GKH |
769 | if (retval) |
770 | goto err_rom; | |
771 | } else { | |
772 | retval = -ENOMEM; | |
9890b12a | 773 | goto err_resource_files; |
1da177e4 LT |
774 | } |
775 | } | |
776 | /* add platform-specific attributes */ | |
a2cd52ca ME |
777 | if (pcibios_add_platform_entries(pdev)) |
778 | goto err_rom_file; | |
b19441af | 779 | |
7d715a6c SL |
780 | pcie_aspm_create_sysfs_dev_files(pdev); |
781 | ||
1da177e4 | 782 | return 0; |
b19441af | 783 | |
a2cd52ca ME |
784 | err_rom_file: |
785 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) | |
94e61088 | 786 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); |
b19441af | 787 | err_rom: |
94e61088 | 788 | kfree(pdev->rom_attr); |
9890b12a ME |
789 | err_resource_files: |
790 | pci_remove_resource_files(pdev); | |
94e61088 BH |
791 | err_vpd_file: |
792 | if (pdev->vpd) { | |
793 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr); | |
794 | err_vpd: | |
795 | kfree(pdev->vpd->attr); | |
796 | } | |
797 | err_config_file: | |
b19441af GKH |
798 | if (pdev->cfg_size < 4096) |
799 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
800 | else | |
801 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
802 | err: | |
803 | return retval; | |
1da177e4 LT |
804 | } |
805 | ||
806 | /** | |
807 | * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files | |
808 | * @pdev: device whose entries we should free | |
809 | * | |
810 | * Cleanup when @pdev is removed from sysfs. | |
811 | */ | |
812 | void pci_remove_sysfs_dev_files(struct pci_dev *pdev) | |
813 | { | |
d67afe5e DM |
814 | if (!sysfs_initialized) |
815 | return; | |
816 | ||
7d715a6c SL |
817 | pcie_aspm_remove_sysfs_dev_files(pdev); |
818 | ||
94e61088 BH |
819 | if (pdev->vpd) { |
820 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr); | |
821 | kfree(pdev->vpd->attr); | |
822 | } | |
1da177e4 LT |
823 | if (pdev->cfg_size < 4096) |
824 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
825 | else | |
826 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
827 | ||
828 | pci_remove_resource_files(pdev); | |
829 | ||
830 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) { | |
831 | if (pdev->rom_attr) { | |
832 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); | |
833 | kfree(pdev->rom_attr); | |
834 | } | |
835 | } | |
836 | } | |
837 | ||
838 | static int __init pci_sysfs_init(void) | |
839 | { | |
840 | struct pci_dev *pdev = NULL; | |
b19441af GKH |
841 | int retval; |
842 | ||
1da177e4 | 843 | sysfs_initialized = 1; |
b19441af GKH |
844 | for_each_pci_dev(pdev) { |
845 | retval = pci_create_sysfs_dev_files(pdev); | |
151fc5df JL |
846 | if (retval) { |
847 | pci_dev_put(pdev); | |
b19441af | 848 | return retval; |
151fc5df | 849 | } |
b19441af | 850 | } |
1da177e4 LT |
851 | |
852 | return 0; | |
853 | } | |
854 | ||
40ee9e9f | 855 | late_initcall(pci_sysfs_init); |