Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
24 | #include "pci.h" |
25 | ||
26 | static int sysfs_initialized; /* = 0 */ | |
27 | ||
28 | /* show configuration fields */ | |
29 | #define pci_config_attr(field, format_string) \ | |
30 | static ssize_t \ | |
e404e274 | 31 | field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
32 | { \ |
33 | struct pci_dev *pdev; \ | |
34 | \ | |
35 | pdev = to_pci_dev (dev); \ | |
36 | return sprintf (buf, format_string, pdev->field); \ | |
37 | } | |
38 | ||
39 | pci_config_attr(vendor, "0x%04x\n"); | |
40 | pci_config_attr(device, "0x%04x\n"); | |
41 | pci_config_attr(subsystem_vendor, "0x%04x\n"); | |
42 | pci_config_attr(subsystem_device, "0x%04x\n"); | |
43 | pci_config_attr(class, "0x%06x\n"); | |
44 | pci_config_attr(irq, "%u\n"); | |
45 | ||
bdee9d98 DT |
46 | static ssize_t broken_parity_status_show(struct device *dev, |
47 | struct device_attribute *attr, | |
48 | char *buf) | |
49 | { | |
50 | struct pci_dev *pdev = to_pci_dev(dev); | |
51 | return sprintf (buf, "%u\n", pdev->broken_parity_status); | |
52 | } | |
53 | ||
54 | static ssize_t broken_parity_status_store(struct device *dev, | |
55 | struct device_attribute *attr, | |
56 | const char *buf, size_t count) | |
57 | { | |
58 | struct pci_dev *pdev = to_pci_dev(dev); | |
59 | ssize_t consumed = -EINVAL; | |
60 | ||
61 | if ((count > 0) && (*buf == '0' || *buf == '1')) { | |
62 | pdev->broken_parity_status = *buf == '1' ? 1 : 0; | |
63 | consumed = count; | |
64 | } | |
65 | return consumed; | |
66 | } | |
67 | ||
4327edf6 AC |
68 | static ssize_t local_cpus_show(struct device *dev, |
69 | struct device_attribute *attr, char *buf) | |
1da177e4 | 70 | { |
4327edf6 AC |
71 | cpumask_t mask; |
72 | int len; | |
73 | ||
74 | mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); | |
75 | len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
1da177e4 LT |
76 | strcat(buf,"\n"); |
77 | return 1+len; | |
78 | } | |
79 | ||
80 | /* show resources */ | |
81 | static ssize_t | |
e404e274 | 82 | resource_show(struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
83 | { |
84 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
85 | char * str = buf; | |
86 | int i; | |
87 | int max = 7; | |
e31dd6e4 | 88 | resource_size_t start, end; |
1da177e4 LT |
89 | |
90 | if (pci_dev->subordinate) | |
91 | max = DEVICE_COUNT_RESOURCE; | |
92 | ||
93 | for (i = 0; i < max; i++) { | |
2311b1f2 ME |
94 | struct resource *res = &pci_dev->resource[i]; |
95 | pci_resource_to_user(pci_dev, i, res, &start, &end); | |
96 | str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n", | |
97 | (unsigned long long)start, | |
98 | (unsigned long long)end, | |
99 | (unsigned long long)res->flags); | |
1da177e4 LT |
100 | } |
101 | return (str - buf); | |
102 | } | |
103 | ||
87c8a443 | 104 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
9888549e GK |
105 | { |
106 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
107 | ||
108 | return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n", | |
109 | pci_dev->vendor, pci_dev->device, | |
110 | pci_dev->subsystem_vendor, pci_dev->subsystem_device, | |
111 | (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), | |
112 | (u8)(pci_dev->class)); | |
113 | } | |
bae94d02 IPG |
114 | |
115 | static ssize_t is_enabled_store(struct device *dev, | |
116 | struct device_attribute *attr, const char *buf, | |
117 | size_t count) | |
9f125d30 | 118 | { |
bae94d02 | 119 | ssize_t result = -EINVAL; |
9f125d30 AV |
120 | struct pci_dev *pdev = to_pci_dev(dev); |
121 | ||
122 | /* this can crash the machine when done on the "wrong" device */ | |
123 | if (!capable(CAP_SYS_ADMIN)) | |
124 | return count; | |
125 | ||
bae94d02 IPG |
126 | if (*buf == '0') { |
127 | if (atomic_read(&pdev->enable_cnt) != 0) | |
128 | pci_disable_device(pdev); | |
129 | else | |
130 | result = -EIO; | |
131 | } else if (*buf == '1') | |
132 | result = pci_enable_device(pdev); | |
9f125d30 | 133 | |
bae94d02 IPG |
134 | return result < 0 ? result : count; |
135 | } | |
136 | ||
137 | static ssize_t is_enabled_show(struct device *dev, | |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | struct pci_dev *pdev; | |
9f125d30 | 141 | |
bae94d02 IPG |
142 | pdev = to_pci_dev (dev); |
143 | return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt)); | |
9f125d30 AV |
144 | } |
145 | ||
81bb0e19 BG |
146 | #ifdef CONFIG_NUMA |
147 | static ssize_t | |
148 | numa_node_show(struct device *dev, struct device_attribute *attr, char *buf) | |
149 | { | |
150 | return sprintf (buf, "%d\n", dev->numa_node); | |
151 | } | |
152 | #endif | |
153 | ||
fe97064c BG |
154 | static ssize_t |
155 | msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf) | |
156 | { | |
157 | struct pci_dev *pdev = to_pci_dev(dev); | |
158 | ||
159 | if (!pdev->subordinate) | |
160 | return 0; | |
161 | ||
162 | return sprintf (buf, "%u\n", | |
163 | !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)); | |
164 | } | |
165 | ||
166 | static ssize_t | |
167 | msi_bus_store(struct device *dev, struct device_attribute *attr, | |
168 | const char *buf, size_t count) | |
169 | { | |
170 | struct pci_dev *pdev = to_pci_dev(dev); | |
171 | ||
172 | /* bad things may happen if the no_msi flag is changed | |
173 | * while some drivers are loaded */ | |
174 | if (!capable(CAP_SYS_ADMIN)) | |
175 | return count; | |
176 | ||
177 | if (!pdev->subordinate) | |
178 | return count; | |
179 | ||
180 | if (*buf == '0') { | |
181 | pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; | |
182 | dev_warn(&pdev->dev, "forced subordinate bus to not support MSI," | |
183 | " bad things could happen.\n"); | |
184 | } | |
185 | ||
186 | if (*buf == '1') { | |
187 | pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; | |
188 | dev_warn(&pdev->dev, "forced subordinate bus to support MSI," | |
189 | " bad things could happen.\n"); | |
190 | } | |
191 | ||
192 | return count; | |
193 | } | |
9888549e | 194 | |
1da177e4 LT |
195 | struct device_attribute pci_dev_attrs[] = { |
196 | __ATTR_RO(resource), | |
197 | __ATTR_RO(vendor), | |
198 | __ATTR_RO(device), | |
199 | __ATTR_RO(subsystem_vendor), | |
200 | __ATTR_RO(subsystem_device), | |
201 | __ATTR_RO(class), | |
202 | __ATTR_RO(irq), | |
203 | __ATTR_RO(local_cpus), | |
9888549e | 204 | __ATTR_RO(modalias), |
81bb0e19 BG |
205 | #ifdef CONFIG_NUMA |
206 | __ATTR_RO(numa_node), | |
207 | #endif | |
9f125d30 | 208 | __ATTR(enable, 0600, is_enabled_show, is_enabled_store), |
bdee9d98 DT |
209 | __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR), |
210 | broken_parity_status_show,broken_parity_status_store), | |
fe97064c | 211 | __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store), |
1da177e4 LT |
212 | __ATTR_NULL, |
213 | }; | |
214 | ||
215 | static ssize_t | |
91a69029 ZR |
216 | pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
217 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
218 | { |
219 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
220 | unsigned int size = 64; | |
221 | loff_t init_off = off; | |
4c0619ad | 222 | u8 *data = (u8*) buf; |
1da177e4 LT |
223 | |
224 | /* Several chips lock up trying to read undefined config space */ | |
225 | if (capable(CAP_SYS_ADMIN)) { | |
226 | size = dev->cfg_size; | |
227 | } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { | |
228 | size = 128; | |
229 | } | |
230 | ||
231 | if (off > size) | |
232 | return 0; | |
233 | if (off + count > size) { | |
234 | size -= off; | |
235 | count = size; | |
236 | } else { | |
237 | size = count; | |
238 | } | |
239 | ||
4c0619ad | 240 | if ((off & 1) && size) { |
241 | u8 val; | |
e04b0ea2 | 242 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 243 | data[off - init_off] = val; |
1da177e4 | 244 | off++; |
4c0619ad | 245 | size--; |
246 | } | |
247 | ||
248 | if ((off & 3) && size > 2) { | |
249 | u16 val; | |
e04b0ea2 | 250 | pci_user_read_config_word(dev, off, &val); |
4c0619ad | 251 | data[off - init_off] = val & 0xff; |
252 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
253 | off += 2; | |
254 | size -= 2; | |
1da177e4 LT |
255 | } |
256 | ||
257 | while (size > 3) { | |
4c0619ad | 258 | u32 val; |
e04b0ea2 | 259 | pci_user_read_config_dword(dev, off, &val); |
4c0619ad | 260 | data[off - init_off] = val & 0xff; |
261 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
262 | data[off - init_off + 2] = (val >> 16) & 0xff; | |
263 | data[off - init_off + 3] = (val >> 24) & 0xff; | |
1da177e4 LT |
264 | off += 4; |
265 | size -= 4; | |
266 | } | |
267 | ||
4c0619ad | 268 | if (size >= 2) { |
269 | u16 val; | |
e04b0ea2 | 270 | pci_user_read_config_word(dev, off, &val); |
4c0619ad | 271 | data[off - init_off] = val & 0xff; |
272 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
273 | off += 2; | |
274 | size -= 2; | |
275 | } | |
276 | ||
277 | if (size > 0) { | |
278 | u8 val; | |
e04b0ea2 | 279 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 280 | data[off - init_off] = val; |
1da177e4 LT |
281 | off++; |
282 | --size; | |
283 | } | |
284 | ||
285 | return count; | |
286 | } | |
287 | ||
288 | static ssize_t | |
91a69029 ZR |
289 | pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
290 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
291 | { |
292 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
293 | unsigned int size = count; | |
294 | loff_t init_off = off; | |
4c0619ad | 295 | u8 *data = (u8*) buf; |
1da177e4 LT |
296 | |
297 | if (off > dev->cfg_size) | |
298 | return 0; | |
299 | if (off + count > dev->cfg_size) { | |
300 | size = dev->cfg_size - off; | |
301 | count = size; | |
302 | } | |
4c0619ad | 303 | |
304 | if ((off & 1) && size) { | |
e04b0ea2 | 305 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 | 306 | off++; |
4c0619ad | 307 | size--; |
1da177e4 | 308 | } |
4c0619ad | 309 | |
310 | if ((off & 3) && size > 2) { | |
311 | u16 val = data[off - init_off]; | |
312 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 313 | pci_user_write_config_word(dev, off, val); |
4c0619ad | 314 | off += 2; |
315 | size -= 2; | |
316 | } | |
1da177e4 LT |
317 | |
318 | while (size > 3) { | |
4c0619ad | 319 | u32 val = data[off - init_off]; |
320 | val |= (u32) data[off - init_off + 1] << 8; | |
321 | val |= (u32) data[off - init_off + 2] << 16; | |
322 | val |= (u32) data[off - init_off + 3] << 24; | |
e04b0ea2 | 323 | pci_user_write_config_dword(dev, off, val); |
1da177e4 LT |
324 | off += 4; |
325 | size -= 4; | |
326 | } | |
4c0619ad | 327 | |
328 | if (size >= 2) { | |
329 | u16 val = data[off - init_off]; | |
330 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 331 | pci_user_write_config_word(dev, off, val); |
4c0619ad | 332 | off += 2; |
333 | size -= 2; | |
334 | } | |
1da177e4 | 335 | |
4c0619ad | 336 | if (size) { |
e04b0ea2 | 337 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 LT |
338 | off++; |
339 | --size; | |
340 | } | |
341 | ||
342 | return count; | |
343 | } | |
344 | ||
345 | #ifdef HAVE_PCI_LEGACY | |
346 | /** | |
347 | * pci_read_legacy_io - read byte(s) from legacy I/O port space | |
348 | * @kobj: kobject corresponding to file to read from | |
349 | * @buf: buffer to store results | |
350 | * @off: offset into legacy I/O port space | |
351 | * @count: number of bytes to read | |
352 | * | |
353 | * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
354 | * callback routine (pci_legacy_read). | |
355 | */ | |
356 | ssize_t | |
91a69029 ZR |
357 | pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr, |
358 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
359 | { |
360 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 361 | struct device, |
1da177e4 LT |
362 | kobj)); |
363 | ||
364 | /* Only support 1, 2 or 4 byte accesses */ | |
365 | if (count != 1 && count != 2 && count != 4) | |
366 | return -EINVAL; | |
367 | ||
368 | return pci_legacy_read(bus, off, (u32 *)buf, count); | |
369 | } | |
370 | ||
371 | /** | |
372 | * pci_write_legacy_io - write byte(s) to legacy I/O port space | |
373 | * @kobj: kobject corresponding to file to read from | |
374 | * @buf: buffer containing value to be written | |
375 | * @off: offset into legacy I/O port space | |
376 | * @count: number of bytes to write | |
377 | * | |
378 | * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
379 | * callback routine (pci_legacy_write). | |
380 | */ | |
381 | ssize_t | |
91a69029 ZR |
382 | pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr, |
383 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
384 | { |
385 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 386 | struct device, |
1da177e4 LT |
387 | kobj)); |
388 | /* Only support 1, 2 or 4 byte accesses */ | |
389 | if (count != 1 && count != 2 && count != 4) | |
390 | return -EINVAL; | |
391 | ||
392 | return pci_legacy_write(bus, off, *(u32 *)buf, count); | |
393 | } | |
394 | ||
395 | /** | |
396 | * pci_mmap_legacy_mem - map legacy PCI memory into user memory space | |
397 | * @kobj: kobject corresponding to device to be mapped | |
398 | * @attr: struct bin_attribute for this file | |
399 | * @vma: struct vm_area_struct passed to mmap | |
400 | * | |
401 | * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap | |
402 | * legacy memory space (first meg of bus space) into application virtual | |
403 | * memory space. | |
404 | */ | |
405 | int | |
406 | pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr, | |
407 | struct vm_area_struct *vma) | |
408 | { | |
409 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
fd7d1ced | 410 | struct device, |
1da177e4 LT |
411 | kobj)); |
412 | ||
413 | return pci_mmap_legacy_page_range(bus, vma); | |
414 | } | |
415 | #endif /* HAVE_PCI_LEGACY */ | |
416 | ||
417 | #ifdef HAVE_PCI_MMAP | |
418 | /** | |
419 | * pci_mmap_resource - map a PCI resource into user memory space | |
420 | * @kobj: kobject for mapping | |
421 | * @attr: struct bin_attribute for the file being mapped | |
422 | * @vma: struct vm_area_struct passed into the mmap | |
423 | * | |
424 | * Use the regular PCI mapping routines to map a PCI resource into userspace. | |
425 | * FIXME: write combining? maybe automatic for prefetchable regions? | |
426 | */ | |
427 | static int | |
428 | pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, | |
429 | struct vm_area_struct *vma) | |
430 | { | |
431 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, | |
432 | struct device, kobj)); | |
433 | struct resource *res = (struct resource *)attr->private; | |
434 | enum pci_mmap_state mmap_type; | |
e31dd6e4 | 435 | resource_size_t start, end; |
2311b1f2 | 436 | int i; |
1da177e4 | 437 | |
2311b1f2 ME |
438 | for (i = 0; i < PCI_ROM_RESOURCE; i++) |
439 | if (res == &pdev->resource[i]) | |
440 | break; | |
441 | if (i >= PCI_ROM_RESOURCE) | |
442 | return -ENODEV; | |
443 | ||
444 | /* pci_mmap_page_range() expects the same kind of entry as coming | |
445 | * from /proc/bus/pci/ which is a "user visible" value. If this is | |
446 | * different from the resource itself, arch will do necessary fixup. | |
447 | */ | |
448 | pci_resource_to_user(pdev, i, res, &start, &end); | |
449 | vma->vm_pgoff += start >> PAGE_SHIFT; | |
1da177e4 LT |
450 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; |
451 | ||
452 | return pci_mmap_page_range(pdev, vma, mmap_type, 0); | |
453 | } | |
454 | ||
b19441af GKH |
455 | /** |
456 | * pci_remove_resource_files - cleanup resource files | |
457 | * @dev: dev to cleanup | |
458 | * | |
459 | * If we created resource files for @dev, remove them from sysfs and | |
460 | * free their resources. | |
461 | */ | |
462 | static void | |
463 | pci_remove_resource_files(struct pci_dev *pdev) | |
464 | { | |
465 | int i; | |
466 | ||
467 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
468 | struct bin_attribute *res_attr; | |
469 | ||
470 | res_attr = pdev->res_attr[i]; | |
471 | if (res_attr) { | |
472 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
473 | kfree(res_attr); | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
1da177e4 LT |
478 | /** |
479 | * pci_create_resource_files - create resource files in sysfs for @dev | |
480 | * @dev: dev in question | |
481 | * | |
482 | * Walk the resources in @dev creating files for each resource available. | |
483 | */ | |
b19441af | 484 | static int pci_create_resource_files(struct pci_dev *pdev) |
1da177e4 LT |
485 | { |
486 | int i; | |
b19441af | 487 | int retval; |
1da177e4 LT |
488 | |
489 | /* Expose the PCI resources from this device as files */ | |
490 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
491 | struct bin_attribute *res_attr; | |
492 | ||
493 | /* skip empty resources */ | |
494 | if (!pci_resource_len(pdev, i)) | |
495 | continue; | |
496 | ||
d48593bf | 497 | /* allocate attribute structure, piggyback attribute name */ |
656da9da | 498 | res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC); |
1da177e4 | 499 | if (res_attr) { |
d48593bf DT |
500 | char *res_attr_name = (char *)(res_attr + 1); |
501 | ||
1da177e4 | 502 | pdev->res_attr[i] = res_attr; |
d48593bf DT |
503 | sprintf(res_attr_name, "resource%d", i); |
504 | res_attr->attr.name = res_attr_name; | |
1da177e4 | 505 | res_attr->attr.mode = S_IRUSR | S_IWUSR; |
d48593bf | 506 | res_attr->size = pci_resource_len(pdev, i); |
1da177e4 LT |
507 | res_attr->mmap = pci_mmap_resource; |
508 | res_attr->private = &pdev->resource[i]; | |
b19441af GKH |
509 | retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); |
510 | if (retval) { | |
511 | pci_remove_resource_files(pdev); | |
512 | return retval; | |
513 | } | |
514 | } else { | |
515 | return -ENOMEM; | |
1da177e4 LT |
516 | } |
517 | } | |
b19441af | 518 | return 0; |
1da177e4 LT |
519 | } |
520 | #else /* !HAVE_PCI_MMAP */ | |
b19441af | 521 | static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; } |
1da177e4 LT |
522 | static inline void pci_remove_resource_files(struct pci_dev *dev) { return; } |
523 | #endif /* HAVE_PCI_MMAP */ | |
524 | ||
525 | /** | |
526 | * pci_write_rom - used to enable access to the PCI ROM display | |
527 | * @kobj: kernel object handle | |
528 | * @buf: user input | |
529 | * @off: file offset | |
530 | * @count: number of byte in input | |
531 | * | |
532 | * writing anything except 0 enables it | |
533 | */ | |
534 | static ssize_t | |
91a69029 ZR |
535 | pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
536 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
537 | { |
538 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
539 | ||
540 | if ((off == 0) && (*buf == '0') && (count == 2)) | |
541 | pdev->rom_attr_enabled = 0; | |
542 | else | |
543 | pdev->rom_attr_enabled = 1; | |
544 | ||
545 | return count; | |
546 | } | |
547 | ||
548 | /** | |
549 | * pci_read_rom - read a PCI ROM | |
550 | * @kobj: kernel object handle | |
551 | * @buf: where to put the data we read from the ROM | |
552 | * @off: file offset | |
553 | * @count: number of bytes to read | |
554 | * | |
555 | * Put @count bytes starting at @off into @buf from the ROM in the PCI | |
556 | * device corresponding to @kobj. | |
557 | */ | |
558 | static ssize_t | |
91a69029 ZR |
559 | pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
560 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
561 | { |
562 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
563 | void __iomem *rom; | |
564 | size_t size; | |
565 | ||
566 | if (!pdev->rom_attr_enabled) | |
567 | return -EINVAL; | |
568 | ||
569 | rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ | |
570 | if (!rom) | |
571 | return 0; | |
572 | ||
573 | if (off >= size) | |
574 | count = 0; | |
575 | else { | |
576 | if (off + count > size) | |
577 | count = size - off; | |
578 | ||
579 | memcpy_fromio(buf, rom + off, count); | |
580 | } | |
581 | pci_unmap_rom(pdev, rom); | |
582 | ||
583 | return count; | |
584 | } | |
585 | ||
586 | static struct bin_attribute pci_config_attr = { | |
587 | .attr = { | |
588 | .name = "config", | |
589 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 LT |
590 | }, |
591 | .size = 256, | |
592 | .read = pci_read_config, | |
593 | .write = pci_write_config, | |
594 | }; | |
595 | ||
596 | static struct bin_attribute pcie_config_attr = { | |
597 | .attr = { | |
598 | .name = "config", | |
599 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 LT |
600 | }, |
601 | .size = 4096, | |
602 | .read = pci_read_config, | |
603 | .write = pci_write_config, | |
604 | }; | |
605 | ||
a2cd52ca | 606 | int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev) |
575e3348 | 607 | { |
a2cd52ca | 608 | return 0; |
575e3348 ME |
609 | } |
610 | ||
b19441af | 611 | int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) |
1da177e4 | 612 | { |
b19441af GKH |
613 | struct bin_attribute *rom_attr = NULL; |
614 | int retval; | |
615 | ||
1da177e4 LT |
616 | if (!sysfs_initialized) |
617 | return -EACCES; | |
618 | ||
619 | if (pdev->cfg_size < 4096) | |
b19441af | 620 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); |
1da177e4 | 621 | else |
b19441af GKH |
622 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); |
623 | if (retval) | |
624 | goto err; | |
1da177e4 | 625 | |
b19441af GKH |
626 | retval = pci_create_resource_files(pdev); |
627 | if (retval) | |
628 | goto err_bin_file; | |
1da177e4 LT |
629 | |
630 | /* If the device has a ROM, try to expose it in sysfs. */ | |
40ee9e9f JB |
631 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE) || |
632 | (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) { | |
f5afe806 | 633 | rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC); |
1da177e4 | 634 | if (rom_attr) { |
1da177e4 LT |
635 | pdev->rom_attr = rom_attr; |
636 | rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE); | |
637 | rom_attr->attr.name = "rom"; | |
638 | rom_attr->attr.mode = S_IRUSR; | |
1da177e4 LT |
639 | rom_attr->read = pci_read_rom; |
640 | rom_attr->write = pci_write_rom; | |
b19441af GKH |
641 | retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr); |
642 | if (retval) | |
643 | goto err_rom; | |
644 | } else { | |
645 | retval = -ENOMEM; | |
9890b12a | 646 | goto err_resource_files; |
1da177e4 LT |
647 | } |
648 | } | |
649 | /* add platform-specific attributes */ | |
a2cd52ca ME |
650 | if (pcibios_add_platform_entries(pdev)) |
651 | goto err_rom_file; | |
b19441af | 652 | |
1da177e4 | 653 | return 0; |
b19441af | 654 | |
a2cd52ca ME |
655 | err_rom_file: |
656 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) | |
657 | sysfs_remove_bin_file(&pdev->dev.kobj, rom_attr); | |
b19441af GKH |
658 | err_rom: |
659 | kfree(rom_attr); | |
9890b12a ME |
660 | err_resource_files: |
661 | pci_remove_resource_files(pdev); | |
b19441af GKH |
662 | err_bin_file: |
663 | if (pdev->cfg_size < 4096) | |
664 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
665 | else | |
666 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
667 | err: | |
668 | return retval; | |
1da177e4 LT |
669 | } |
670 | ||
671 | /** | |
672 | * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files | |
673 | * @pdev: device whose entries we should free | |
674 | * | |
675 | * Cleanup when @pdev is removed from sysfs. | |
676 | */ | |
677 | void pci_remove_sysfs_dev_files(struct pci_dev *pdev) | |
678 | { | |
d67afe5e DM |
679 | if (!sysfs_initialized) |
680 | return; | |
681 | ||
1da177e4 LT |
682 | if (pdev->cfg_size < 4096) |
683 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
684 | else | |
685 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
686 | ||
687 | pci_remove_resource_files(pdev); | |
688 | ||
689 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) { | |
690 | if (pdev->rom_attr) { | |
691 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); | |
692 | kfree(pdev->rom_attr); | |
693 | } | |
694 | } | |
695 | } | |
696 | ||
697 | static int __init pci_sysfs_init(void) | |
698 | { | |
699 | struct pci_dev *pdev = NULL; | |
b19441af GKH |
700 | int retval; |
701 | ||
1da177e4 | 702 | sysfs_initialized = 1; |
b19441af GKH |
703 | for_each_pci_dev(pdev) { |
704 | retval = pci_create_sysfs_dev_files(pdev); | |
151fc5df JL |
705 | if (retval) { |
706 | pci_dev_put(pdev); | |
b19441af | 707 | return retval; |
151fc5df | 708 | } |
b19441af | 709 | } |
1da177e4 LT |
710 | |
711 | return 0; | |
712 | } | |
713 | ||
40ee9e9f | 714 | late_initcall(pci_sysfs_init); |