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 | 18 | #include <linux/kernel.h> |
b5ff7df3 | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/pci.h> |
21 | #include <linux/stat.h> | |
22 | #include <linux/topology.h> | |
23 | #include <linux/mm.h> | |
aa0ac365 | 24 | #include <linux/capability.h> |
7d715a6c | 25 | #include <linux/pci-aspm.h> |
1da177e4 LT |
26 | #include "pci.h" |
27 | ||
28 | static int sysfs_initialized; /* = 0 */ | |
29 | ||
30 | /* show configuration fields */ | |
31 | #define pci_config_attr(field, format_string) \ | |
32 | static ssize_t \ | |
e404e274 | 33 | field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
34 | { \ |
35 | struct pci_dev *pdev; \ | |
36 | \ | |
37 | pdev = to_pci_dev (dev); \ | |
38 | return sprintf (buf, format_string, pdev->field); \ | |
39 | } | |
40 | ||
41 | pci_config_attr(vendor, "0x%04x\n"); | |
42 | pci_config_attr(device, "0x%04x\n"); | |
43 | pci_config_attr(subsystem_vendor, "0x%04x\n"); | |
44 | pci_config_attr(subsystem_device, "0x%04x\n"); | |
45 | pci_config_attr(class, "0x%06x\n"); | |
46 | pci_config_attr(irq, "%u\n"); | |
47 | ||
bdee9d98 DT |
48 | static ssize_t broken_parity_status_show(struct device *dev, |
49 | struct device_attribute *attr, | |
50 | char *buf) | |
51 | { | |
52 | struct pci_dev *pdev = to_pci_dev(dev); | |
53 | return sprintf (buf, "%u\n", pdev->broken_parity_status); | |
54 | } | |
55 | ||
56 | static ssize_t broken_parity_status_store(struct device *dev, | |
57 | struct device_attribute *attr, | |
58 | const char *buf, size_t count) | |
59 | { | |
60 | struct pci_dev *pdev = to_pci_dev(dev); | |
92425a40 | 61 | unsigned long val; |
bdee9d98 | 62 | |
92425a40 TP |
63 | if (strict_strtoul(buf, 0, &val) < 0) |
64 | return -EINVAL; | |
65 | ||
66 | pdev->broken_parity_status = !!val; | |
67 | ||
68 | return count; | |
bdee9d98 DT |
69 | } |
70 | ||
4327edf6 AC |
71 | static ssize_t local_cpus_show(struct device *dev, |
72 | struct device_attribute *attr, char *buf) | |
1da177e4 | 73 | { |
3be83050 | 74 | const struct cpumask *mask; |
4327edf6 AC |
75 | int len; |
76 | ||
3be83050 MT |
77 | mask = cpumask_of_pcibus(to_pci_dev(dev)->bus); |
78 | len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
39106dcf MT |
79 | buf[len++] = '\n'; |
80 | buf[len] = '\0'; | |
81 | return len; | |
82 | } | |
83 | ||
84 | ||
85 | static ssize_t local_cpulist_show(struct device *dev, | |
86 | struct device_attribute *attr, char *buf) | |
87 | { | |
3be83050 | 88 | const struct cpumask *mask; |
39106dcf MT |
89 | int len; |
90 | ||
3be83050 MT |
91 | mask = cpumask_of_pcibus(to_pci_dev(dev)->bus); |
92 | len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask); | |
39106dcf MT |
93 | buf[len++] = '\n'; |
94 | buf[len] = '\0'; | |
95 | return len; | |
1da177e4 LT |
96 | } |
97 | ||
98 | /* show resources */ | |
99 | static ssize_t | |
e404e274 | 100 | resource_show(struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
101 | { |
102 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
103 | char * str = buf; | |
104 | int i; | |
fde09c6d | 105 | int max; |
e31dd6e4 | 106 | resource_size_t start, end; |
1da177e4 LT |
107 | |
108 | if (pci_dev->subordinate) | |
109 | max = DEVICE_COUNT_RESOURCE; | |
fde09c6d YZ |
110 | else |
111 | max = PCI_BRIDGE_RESOURCES; | |
1da177e4 LT |
112 | |
113 | for (i = 0; i < max; i++) { | |
2311b1f2 ME |
114 | struct resource *res = &pci_dev->resource[i]; |
115 | pci_resource_to_user(pci_dev, i, res, &start, &end); | |
116 | str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n", | |
117 | (unsigned long long)start, | |
118 | (unsigned long long)end, | |
119 | (unsigned long long)res->flags); | |
1da177e4 LT |
120 | } |
121 | return (str - buf); | |
122 | } | |
123 | ||
87c8a443 | 124 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) |
9888549e GK |
125 | { |
126 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
127 | ||
128 | return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n", | |
129 | pci_dev->vendor, pci_dev->device, | |
130 | pci_dev->subsystem_vendor, pci_dev->subsystem_device, | |
131 | (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8), | |
132 | (u8)(pci_dev->class)); | |
133 | } | |
bae94d02 IPG |
134 | |
135 | static ssize_t is_enabled_store(struct device *dev, | |
136 | struct device_attribute *attr, const char *buf, | |
137 | size_t count) | |
9f125d30 AV |
138 | { |
139 | struct pci_dev *pdev = to_pci_dev(dev); | |
92425a40 TP |
140 | unsigned long val; |
141 | ssize_t result = strict_strtoul(buf, 0, &val); | |
142 | ||
143 | if (result < 0) | |
144 | return result; | |
9f125d30 AV |
145 | |
146 | /* this can crash the machine when done on the "wrong" device */ | |
147 | if (!capable(CAP_SYS_ADMIN)) | |
92425a40 | 148 | return -EPERM; |
9f125d30 | 149 | |
92425a40 | 150 | if (!val) { |
bae94d02 IPG |
151 | if (atomic_read(&pdev->enable_cnt) != 0) |
152 | pci_disable_device(pdev); | |
153 | else | |
154 | result = -EIO; | |
92425a40 | 155 | } else |
bae94d02 | 156 | result = pci_enable_device(pdev); |
9f125d30 | 157 | |
bae94d02 IPG |
158 | return result < 0 ? result : count; |
159 | } | |
160 | ||
161 | static ssize_t is_enabled_show(struct device *dev, | |
162 | struct device_attribute *attr, char *buf) | |
163 | { | |
164 | struct pci_dev *pdev; | |
9f125d30 | 165 | |
bae94d02 IPG |
166 | pdev = to_pci_dev (dev); |
167 | return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt)); | |
9f125d30 AV |
168 | } |
169 | ||
81bb0e19 BG |
170 | #ifdef CONFIG_NUMA |
171 | static ssize_t | |
172 | numa_node_show(struct device *dev, struct device_attribute *attr, char *buf) | |
173 | { | |
174 | return sprintf (buf, "%d\n", dev->numa_node); | |
175 | } | |
176 | #endif | |
177 | ||
fe97064c BG |
178 | static ssize_t |
179 | msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf) | |
180 | { | |
181 | struct pci_dev *pdev = to_pci_dev(dev); | |
182 | ||
183 | if (!pdev->subordinate) | |
184 | return 0; | |
185 | ||
186 | return sprintf (buf, "%u\n", | |
187 | !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)); | |
188 | } | |
189 | ||
190 | static ssize_t | |
191 | msi_bus_store(struct device *dev, struct device_attribute *attr, | |
192 | const char *buf, size_t count) | |
193 | { | |
194 | struct pci_dev *pdev = to_pci_dev(dev); | |
92425a40 TP |
195 | unsigned long val; |
196 | ||
197 | if (strict_strtoul(buf, 0, &val) < 0) | |
198 | return -EINVAL; | |
fe97064c BG |
199 | |
200 | /* bad things may happen if the no_msi flag is changed | |
201 | * while some drivers are loaded */ | |
202 | if (!capable(CAP_SYS_ADMIN)) | |
92425a40 | 203 | return -EPERM; |
fe97064c | 204 | |
92425a40 TP |
205 | /* Maybe pci devices without subordinate busses shouldn't even have this |
206 | * attribute in the first place? */ | |
fe97064c BG |
207 | if (!pdev->subordinate) |
208 | return count; | |
209 | ||
92425a40 TP |
210 | /* Is the flag going to change, or keep the value it already had? */ |
211 | if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^ | |
212 | !!val) { | |
213 | pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI; | |
fe97064c | 214 | |
92425a40 TP |
215 | dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI," |
216 | " bad things could happen\n", val ? "" : " not"); | |
fe97064c BG |
217 | } |
218 | ||
219 | return count; | |
220 | } | |
9888549e | 221 | |
1da177e4 LT |
222 | struct device_attribute pci_dev_attrs[] = { |
223 | __ATTR_RO(resource), | |
224 | __ATTR_RO(vendor), | |
225 | __ATTR_RO(device), | |
226 | __ATTR_RO(subsystem_vendor), | |
227 | __ATTR_RO(subsystem_device), | |
228 | __ATTR_RO(class), | |
229 | __ATTR_RO(irq), | |
230 | __ATTR_RO(local_cpus), | |
39106dcf | 231 | __ATTR_RO(local_cpulist), |
9888549e | 232 | __ATTR_RO(modalias), |
81bb0e19 BG |
233 | #ifdef CONFIG_NUMA |
234 | __ATTR_RO(numa_node), | |
235 | #endif | |
9f125d30 | 236 | __ATTR(enable, 0600, is_enabled_show, is_enabled_store), |
bdee9d98 DT |
237 | __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR), |
238 | broken_parity_status_show,broken_parity_status_store), | |
fe97064c | 239 | __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store), |
1da177e4 LT |
240 | __ATTR_NULL, |
241 | }; | |
242 | ||
217f45de DA |
243 | static ssize_t |
244 | boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf) | |
245 | { | |
246 | struct pci_dev *pdev = to_pci_dev(dev); | |
247 | ||
248 | return sprintf(buf, "%u\n", | |
249 | !!(pdev->resource[PCI_ROM_RESOURCE].flags & | |
250 | IORESOURCE_ROM_SHADOW)); | |
251 | } | |
252 | struct device_attribute vga_attr = __ATTR_RO(boot_vga); | |
253 | ||
1da177e4 | 254 | static ssize_t |
91a69029 ZR |
255 | pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
256 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
257 | { |
258 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
259 | unsigned int size = 64; | |
260 | loff_t init_off = off; | |
4c0619ad | 261 | u8 *data = (u8*) buf; |
1da177e4 LT |
262 | |
263 | /* Several chips lock up trying to read undefined config space */ | |
264 | if (capable(CAP_SYS_ADMIN)) { | |
265 | size = dev->cfg_size; | |
266 | } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { | |
267 | size = 128; | |
268 | } | |
269 | ||
270 | if (off > size) | |
271 | return 0; | |
272 | if (off + count > size) { | |
273 | size -= off; | |
274 | count = size; | |
275 | } else { | |
276 | size = count; | |
277 | } | |
278 | ||
4c0619ad | 279 | if ((off & 1) && size) { |
280 | u8 val; | |
e04b0ea2 | 281 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 282 | data[off - init_off] = val; |
1da177e4 | 283 | off++; |
4c0619ad | 284 | size--; |
285 | } | |
286 | ||
287 | if ((off & 3) && size > 2) { | |
288 | u16 val; | |
e04b0ea2 | 289 | pci_user_read_config_word(dev, off, &val); |
4c0619ad | 290 | data[off - init_off] = val & 0xff; |
291 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
292 | off += 2; | |
293 | size -= 2; | |
1da177e4 LT |
294 | } |
295 | ||
296 | while (size > 3) { | |
4c0619ad | 297 | u32 val; |
e04b0ea2 | 298 | pci_user_read_config_dword(dev, off, &val); |
4c0619ad | 299 | data[off - init_off] = val & 0xff; |
300 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
301 | data[off - init_off + 2] = (val >> 16) & 0xff; | |
302 | data[off - init_off + 3] = (val >> 24) & 0xff; | |
1da177e4 LT |
303 | off += 4; |
304 | size -= 4; | |
305 | } | |
306 | ||
4c0619ad | 307 | if (size >= 2) { |
308 | u16 val; | |
e04b0ea2 | 309 | pci_user_read_config_word(dev, off, &val); |
4c0619ad | 310 | data[off - init_off] = val & 0xff; |
311 | data[off - init_off + 1] = (val >> 8) & 0xff; | |
312 | off += 2; | |
313 | size -= 2; | |
314 | } | |
315 | ||
316 | if (size > 0) { | |
317 | u8 val; | |
e04b0ea2 | 318 | pci_user_read_config_byte(dev, off, &val); |
4c0619ad | 319 | data[off - init_off] = val; |
1da177e4 LT |
320 | off++; |
321 | --size; | |
322 | } | |
323 | ||
324 | return count; | |
325 | } | |
326 | ||
327 | static ssize_t | |
91a69029 ZR |
328 | pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr, |
329 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
330 | { |
331 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
332 | unsigned int size = count; | |
333 | loff_t init_off = off; | |
4c0619ad | 334 | u8 *data = (u8*) buf; |
1da177e4 LT |
335 | |
336 | if (off > dev->cfg_size) | |
337 | return 0; | |
338 | if (off + count > dev->cfg_size) { | |
339 | size = dev->cfg_size - off; | |
340 | count = size; | |
341 | } | |
4c0619ad | 342 | |
343 | if ((off & 1) && size) { | |
e04b0ea2 | 344 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 | 345 | off++; |
4c0619ad | 346 | size--; |
1da177e4 | 347 | } |
4c0619ad | 348 | |
349 | if ((off & 3) && size > 2) { | |
350 | u16 val = data[off - init_off]; | |
351 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 352 | pci_user_write_config_word(dev, off, val); |
4c0619ad | 353 | off += 2; |
354 | size -= 2; | |
355 | } | |
1da177e4 LT |
356 | |
357 | while (size > 3) { | |
4c0619ad | 358 | u32 val = data[off - init_off]; |
359 | val |= (u32) data[off - init_off + 1] << 8; | |
360 | val |= (u32) data[off - init_off + 2] << 16; | |
361 | val |= (u32) data[off - init_off + 3] << 24; | |
e04b0ea2 | 362 | pci_user_write_config_dword(dev, off, val); |
1da177e4 LT |
363 | off += 4; |
364 | size -= 4; | |
365 | } | |
4c0619ad | 366 | |
367 | if (size >= 2) { | |
368 | u16 val = data[off - init_off]; | |
369 | val |= (u16) data[off - init_off + 1] << 8; | |
e04b0ea2 | 370 | pci_user_write_config_word(dev, off, val); |
4c0619ad | 371 | off += 2; |
372 | size -= 2; | |
373 | } | |
1da177e4 | 374 | |
4c0619ad | 375 | if (size) { |
e04b0ea2 | 376 | pci_user_write_config_byte(dev, off, data[off - init_off]); |
1da177e4 LT |
377 | off++; |
378 | --size; | |
379 | } | |
380 | ||
381 | return count; | |
382 | } | |
383 | ||
94e61088 | 384 | static ssize_t |
287d19ce SH |
385 | read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr, |
386 | char *buf, loff_t off, size_t count) | |
94e61088 BH |
387 | { |
388 | struct pci_dev *dev = | |
389 | to_pci_dev(container_of(kobj, struct device, kobj)); | |
94e61088 BH |
390 | |
391 | if (off > bin_attr->size) | |
392 | count = 0; | |
393 | else if (count > bin_attr->size - off) | |
394 | count = bin_attr->size - off; | |
94e61088 | 395 | |
287d19ce | 396 | return pci_read_vpd(dev, off, count, buf); |
94e61088 BH |
397 | } |
398 | ||
399 | static ssize_t | |
287d19ce SH |
400 | write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr, |
401 | char *buf, loff_t off, size_t count) | |
94e61088 BH |
402 | { |
403 | struct pci_dev *dev = | |
404 | to_pci_dev(container_of(kobj, struct device, kobj)); | |
94e61088 BH |
405 | |
406 | if (off > bin_attr->size) | |
407 | count = 0; | |
408 | else if (count > bin_attr->size - off) | |
409 | count = bin_attr->size - off; | |
94e61088 | 410 | |
287d19ce | 411 | return pci_write_vpd(dev, off, count, buf); |
94e61088 BH |
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 | */ | |
f19aeb1f | 425 | static 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 | */ | |
f19aeb1f | 450 | static 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 | * | |
f19aeb1f | 470 | * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap |
1da177e4 LT |
471 | * legacy memory space (first meg of bus space) into application virtual |
472 | * memory space. | |
473 | */ | |
f19aeb1f | 474 | static int |
1da177e4 LT |
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 | ||
f19aeb1f BH |
482 | return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem); |
483 | } | |
484 | ||
485 | /** | |
486 | * pci_mmap_legacy_io - map legacy PCI IO into user memory space | |
487 | * @kobj: kobject corresponding to device to be mapped | |
488 | * @attr: struct bin_attribute for this file | |
489 | * @vma: struct vm_area_struct passed to mmap | |
490 | * | |
491 | * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap | |
492 | * legacy IO space (first meg of bus space) into application virtual | |
493 | * memory space. Returns -ENOSYS if the operation isn't supported | |
494 | */ | |
495 | static int | |
496 | pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr, | |
497 | struct vm_area_struct *vma) | |
498 | { | |
499 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
500 | struct device, | |
501 | kobj)); | |
502 | ||
503 | return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); | |
504 | } | |
505 | ||
10a0ef39 IK |
506 | /** |
507 | * pci_adjust_legacy_attr - adjustment of legacy file attributes | |
508 | * @b: bus to create files under | |
509 | * @mmap_type: I/O port or memory | |
510 | * | |
511 | * Stub implementation. Can be overridden by arch if necessary. | |
512 | */ | |
513 | void __weak | |
514 | pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type) | |
515 | { | |
516 | return; | |
517 | } | |
518 | ||
f19aeb1f BH |
519 | /** |
520 | * pci_create_legacy_files - create legacy I/O port and memory files | |
521 | * @b: bus to create files under | |
522 | * | |
523 | * Some platforms allow access to legacy I/O port and ISA memory space on | |
524 | * a per-bus basis. This routine creates the files and ties them into | |
525 | * their associated read, write and mmap files from pci-sysfs.c | |
526 | * | |
527 | * On error unwind, but don't propogate the error to the caller | |
528 | * as it is ok to set up the PCI bus without these files. | |
529 | */ | |
530 | void pci_create_legacy_files(struct pci_bus *b) | |
531 | { | |
532 | int error; | |
533 | ||
534 | b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, | |
535 | GFP_ATOMIC); | |
536 | if (!b->legacy_io) | |
537 | goto kzalloc_err; | |
538 | ||
539 | b->legacy_io->attr.name = "legacy_io"; | |
540 | b->legacy_io->size = 0xffff; | |
541 | b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; | |
542 | b->legacy_io->read = pci_read_legacy_io; | |
543 | b->legacy_io->write = pci_write_legacy_io; | |
544 | b->legacy_io->mmap = pci_mmap_legacy_io; | |
10a0ef39 | 545 | pci_adjust_legacy_attr(b, pci_mmap_io); |
f19aeb1f BH |
546 | error = device_create_bin_file(&b->dev, b->legacy_io); |
547 | if (error) | |
548 | goto legacy_io_err; | |
549 | ||
550 | /* Allocated above after the legacy_io struct */ | |
551 | b->legacy_mem = b->legacy_io + 1; | |
552 | b->legacy_mem->attr.name = "legacy_mem"; | |
553 | b->legacy_mem->size = 1024*1024; | |
554 | b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; | |
555 | b->legacy_mem->mmap = pci_mmap_legacy_mem; | |
10a0ef39 | 556 | pci_adjust_legacy_attr(b, pci_mmap_mem); |
f19aeb1f BH |
557 | error = device_create_bin_file(&b->dev, b->legacy_mem); |
558 | if (error) | |
559 | goto legacy_mem_err; | |
560 | ||
561 | return; | |
562 | ||
563 | legacy_mem_err: | |
564 | device_remove_bin_file(&b->dev, b->legacy_io); | |
565 | legacy_io_err: | |
566 | kfree(b->legacy_io); | |
567 | b->legacy_io = NULL; | |
568 | kzalloc_err: | |
569 | printk(KERN_WARNING "pci: warning: could not create legacy I/O port " | |
570 | "and ISA memory resources to sysfs\n"); | |
571 | return; | |
572 | } | |
573 | ||
574 | void pci_remove_legacy_files(struct pci_bus *b) | |
575 | { | |
576 | if (b->legacy_io) { | |
577 | device_remove_bin_file(&b->dev, b->legacy_io); | |
578 | device_remove_bin_file(&b->dev, b->legacy_mem); | |
579 | kfree(b->legacy_io); /* both are allocated here */ | |
580 | } | |
1da177e4 LT |
581 | } |
582 | #endif /* HAVE_PCI_LEGACY */ | |
583 | ||
584 | #ifdef HAVE_PCI_MMAP | |
b5ff7df3 | 585 | |
9eff02e2 | 586 | int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma) |
b5ff7df3 LT |
587 | { |
588 | unsigned long nr, start, size; | |
589 | ||
590 | nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
591 | start = vma->vm_pgoff; | |
88e7df0b | 592 | size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; |
b5ff7df3 LT |
593 | if (start < size && size - start >= nr) |
594 | return 1; | |
595 | WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n", | |
596 | current->comm, start, start+nr, pci_name(pdev), resno, size); | |
597 | return 0; | |
598 | } | |
599 | ||
1da177e4 LT |
600 | /** |
601 | * pci_mmap_resource - map a PCI resource into user memory space | |
602 | * @kobj: kobject for mapping | |
603 | * @attr: struct bin_attribute for the file being mapped | |
604 | * @vma: struct vm_area_struct passed into the mmap | |
45aec1ae | 605 | * @write_combine: 1 for write_combine mapping |
1da177e4 LT |
606 | * |
607 | * Use the regular PCI mapping routines to map a PCI resource into userspace. | |
1da177e4 LT |
608 | */ |
609 | static int | |
610 | pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, | |
45aec1ae | 611 | struct vm_area_struct *vma, int write_combine) |
1da177e4 LT |
612 | { |
613 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, | |
614 | struct device, kobj)); | |
615 | struct resource *res = (struct resource *)attr->private; | |
616 | enum pci_mmap_state mmap_type; | |
e31dd6e4 | 617 | resource_size_t start, end; |
2311b1f2 | 618 | int i; |
1da177e4 | 619 | |
2311b1f2 ME |
620 | for (i = 0; i < PCI_ROM_RESOURCE; i++) |
621 | if (res == &pdev->resource[i]) | |
622 | break; | |
623 | if (i >= PCI_ROM_RESOURCE) | |
624 | return -ENODEV; | |
625 | ||
b5ff7df3 LT |
626 | if (!pci_mmap_fits(pdev, i, vma)) |
627 | return -EINVAL; | |
628 | ||
2311b1f2 ME |
629 | /* pci_mmap_page_range() expects the same kind of entry as coming |
630 | * from /proc/bus/pci/ which is a "user visible" value. If this is | |
631 | * different from the resource itself, arch will do necessary fixup. | |
632 | */ | |
633 | pci_resource_to_user(pdev, i, res, &start, &end); | |
634 | vma->vm_pgoff += start >> PAGE_SHIFT; | |
1da177e4 LT |
635 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; |
636 | ||
e8de1481 AV |
637 | if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start)) |
638 | return -EINVAL; | |
639 | ||
45aec1ae | 640 | return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); |
641 | } | |
642 | ||
643 | static int | |
644 | pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr, | |
645 | struct vm_area_struct *vma) | |
646 | { | |
647 | return pci_mmap_resource(kobj, attr, vma, 0); | |
648 | } | |
649 | ||
650 | static int | |
651 | pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr, | |
652 | struct vm_area_struct *vma) | |
653 | { | |
654 | return pci_mmap_resource(kobj, attr, vma, 1); | |
1da177e4 LT |
655 | } |
656 | ||
b19441af GKH |
657 | /** |
658 | * pci_remove_resource_files - cleanup resource files | |
659 | * @dev: dev to cleanup | |
660 | * | |
661 | * If we created resource files for @dev, remove them from sysfs and | |
662 | * free their resources. | |
663 | */ | |
664 | static void | |
665 | pci_remove_resource_files(struct pci_dev *pdev) | |
666 | { | |
667 | int i; | |
668 | ||
669 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
670 | struct bin_attribute *res_attr; | |
671 | ||
672 | res_attr = pdev->res_attr[i]; | |
673 | if (res_attr) { | |
674 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
675 | kfree(res_attr); | |
676 | } | |
45aec1ae | 677 | |
678 | res_attr = pdev->res_attr_wc[i]; | |
679 | if (res_attr) { | |
680 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
681 | kfree(res_attr); | |
682 | } | |
b19441af GKH |
683 | } |
684 | } | |
685 | ||
45aec1ae | 686 | static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) |
687 | { | |
688 | /* allocate attribute structure, piggyback attribute name */ | |
689 | int name_len = write_combine ? 13 : 10; | |
690 | struct bin_attribute *res_attr; | |
691 | int retval; | |
692 | ||
693 | res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); | |
694 | if (res_attr) { | |
695 | char *res_attr_name = (char *)(res_attr + 1); | |
696 | ||
697 | if (write_combine) { | |
698 | pdev->res_attr_wc[num] = res_attr; | |
699 | sprintf(res_attr_name, "resource%d_wc", num); | |
700 | res_attr->mmap = pci_mmap_resource_wc; | |
701 | } else { | |
702 | pdev->res_attr[num] = res_attr; | |
703 | sprintf(res_attr_name, "resource%d", num); | |
704 | res_attr->mmap = pci_mmap_resource_uc; | |
705 | } | |
706 | res_attr->attr.name = res_attr_name; | |
707 | res_attr->attr.mode = S_IRUSR | S_IWUSR; | |
708 | res_attr->size = pci_resource_len(pdev, num); | |
709 | res_attr->private = &pdev->resource[num]; | |
710 | retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); | |
711 | } else | |
712 | retval = -ENOMEM; | |
713 | ||
714 | return retval; | |
715 | } | |
716 | ||
1da177e4 LT |
717 | /** |
718 | * pci_create_resource_files - create resource files in sysfs for @dev | |
719 | * @dev: dev in question | |
720 | * | |
721 | * Walk the resources in @dev creating files for each resource available. | |
722 | */ | |
b19441af | 723 | static int pci_create_resource_files(struct pci_dev *pdev) |
1da177e4 LT |
724 | { |
725 | int i; | |
b19441af | 726 | int retval; |
1da177e4 LT |
727 | |
728 | /* Expose the PCI resources from this device as files */ | |
729 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
1da177e4 LT |
730 | |
731 | /* skip empty resources */ | |
732 | if (!pci_resource_len(pdev, i)) | |
733 | continue; | |
734 | ||
45aec1ae | 735 | retval = pci_create_attr(pdev, i, 0); |
736 | /* for prefetchable resources, create a WC mappable file */ | |
737 | if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) | |
738 | retval = pci_create_attr(pdev, i, 1); | |
739 | ||
740 | if (retval) { | |
741 | pci_remove_resource_files(pdev); | |
742 | return retval; | |
1da177e4 LT |
743 | } |
744 | } | |
b19441af | 745 | return 0; |
1da177e4 LT |
746 | } |
747 | #else /* !HAVE_PCI_MMAP */ | |
10a0ef39 IK |
748 | int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } |
749 | void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } | |
1da177e4 LT |
750 | #endif /* HAVE_PCI_MMAP */ |
751 | ||
752 | /** | |
753 | * pci_write_rom - used to enable access to the PCI ROM display | |
754 | * @kobj: kernel object handle | |
755 | * @buf: user input | |
756 | * @off: file offset | |
757 | * @count: number of byte in input | |
758 | * | |
759 | * writing anything except 0 enables it | |
760 | */ | |
761 | static ssize_t | |
91a69029 ZR |
762 | pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
763 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
764 | { |
765 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
766 | ||
767 | if ((off == 0) && (*buf == '0') && (count == 2)) | |
768 | pdev->rom_attr_enabled = 0; | |
769 | else | |
770 | pdev->rom_attr_enabled = 1; | |
771 | ||
772 | return count; | |
773 | } | |
774 | ||
775 | /** | |
776 | * pci_read_rom - read a PCI ROM | |
777 | * @kobj: kernel object handle | |
778 | * @buf: where to put the data we read from the ROM | |
779 | * @off: file offset | |
780 | * @count: number of bytes to read | |
781 | * | |
782 | * Put @count bytes starting at @off into @buf from the ROM in the PCI | |
783 | * device corresponding to @kobj. | |
784 | */ | |
785 | static ssize_t | |
91a69029 ZR |
786 | pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr, |
787 | char *buf, loff_t off, size_t count) | |
1da177e4 LT |
788 | { |
789 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
790 | void __iomem *rom; | |
791 | size_t size; | |
792 | ||
793 | if (!pdev->rom_attr_enabled) | |
794 | return -EINVAL; | |
795 | ||
796 | rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ | |
97c44836 TN |
797 | if (!rom || !size) |
798 | return -EIO; | |
1da177e4 LT |
799 | |
800 | if (off >= size) | |
801 | count = 0; | |
802 | else { | |
803 | if (off + count > size) | |
804 | count = size - off; | |
805 | ||
806 | memcpy_fromio(buf, rom + off, count); | |
807 | } | |
808 | pci_unmap_rom(pdev, rom); | |
809 | ||
810 | return count; | |
811 | } | |
812 | ||
813 | static struct bin_attribute pci_config_attr = { | |
814 | .attr = { | |
815 | .name = "config", | |
816 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 | 817 | }, |
557848c3 | 818 | .size = PCI_CFG_SPACE_SIZE, |
1da177e4 LT |
819 | .read = pci_read_config, |
820 | .write = pci_write_config, | |
821 | }; | |
822 | ||
823 | static struct bin_attribute pcie_config_attr = { | |
824 | .attr = { | |
825 | .name = "config", | |
826 | .mode = S_IRUGO | S_IWUSR, | |
1da177e4 | 827 | }, |
557848c3 | 828 | .size = PCI_CFG_SPACE_EXP_SIZE, |
1da177e4 LT |
829 | .read = pci_read_config, |
830 | .write = pci_write_config, | |
831 | }; | |
832 | ||
a2cd52ca | 833 | int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev) |
575e3348 | 834 | { |
a2cd52ca | 835 | return 0; |
575e3348 ME |
836 | } |
837 | ||
280c73d3 ZY |
838 | static int pci_create_capabilities_sysfs(struct pci_dev *dev) |
839 | { | |
840 | int retval; | |
841 | struct bin_attribute *attr; | |
842 | ||
843 | /* If the device has VPD, try to expose it in sysfs. */ | |
844 | if (dev->vpd) { | |
845 | attr = kzalloc(sizeof(*attr), GFP_ATOMIC); | |
846 | if (!attr) | |
847 | return -ENOMEM; | |
848 | ||
849 | attr->size = dev->vpd->len; | |
850 | attr->attr.name = "vpd"; | |
851 | attr->attr.mode = S_IRUSR | S_IWUSR; | |
287d19ce SH |
852 | attr->read = read_vpd_attr; |
853 | attr->write = write_vpd_attr; | |
280c73d3 ZY |
854 | retval = sysfs_create_bin_file(&dev->dev.kobj, attr); |
855 | if (retval) { | |
856 | kfree(dev->vpd->attr); | |
857 | return retval; | |
858 | } | |
859 | dev->vpd->attr = attr; | |
860 | } | |
861 | ||
862 | /* Active State Power Management */ | |
863 | pcie_aspm_create_sysfs_dev_files(dev); | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
b19441af | 868 | int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) |
1da177e4 | 869 | { |
b19441af | 870 | int retval; |
280c73d3 ZY |
871 | int rom_size = 0; |
872 | struct bin_attribute *attr; | |
b19441af | 873 | |
1da177e4 LT |
874 | if (!sysfs_initialized) |
875 | return -EACCES; | |
876 | ||
557848c3 | 877 | if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) |
b19441af | 878 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); |
1da177e4 | 879 | else |
b19441af GKH |
880 | retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); |
881 | if (retval) | |
882 | goto err; | |
1da177e4 | 883 | |
b19441af GKH |
884 | retval = pci_create_resource_files(pdev); |
885 | if (retval) | |
280c73d3 ZY |
886 | goto err_config_file; |
887 | ||
888 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) | |
889 | rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); | |
890 | else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) | |
891 | rom_size = 0x20000; | |
1da177e4 LT |
892 | |
893 | /* If the device has a ROM, try to expose it in sysfs. */ | |
280c73d3 | 894 | if (rom_size) { |
94e61088 | 895 | attr = kzalloc(sizeof(*attr), GFP_ATOMIC); |
280c73d3 | 896 | if (!attr) { |
b19441af | 897 | retval = -ENOMEM; |
9890b12a | 898 | goto err_resource_files; |
1da177e4 | 899 | } |
280c73d3 ZY |
900 | attr->size = rom_size; |
901 | attr->attr.name = "rom"; | |
902 | attr->attr.mode = S_IRUSR; | |
903 | attr->read = pci_read_rom; | |
904 | attr->write = pci_write_rom; | |
905 | retval = sysfs_create_bin_file(&pdev->dev.kobj, attr); | |
906 | if (retval) { | |
907 | kfree(attr); | |
908 | goto err_resource_files; | |
909 | } | |
910 | pdev->rom_attr = attr; | |
1da177e4 | 911 | } |
280c73d3 | 912 | |
217f45de DA |
913 | if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { |
914 | retval = device_create_file(&pdev->dev, &vga_attr); | |
915 | if (retval) | |
916 | goto err_rom_file; | |
917 | } | |
918 | ||
1da177e4 | 919 | /* add platform-specific attributes */ |
280c73d3 ZY |
920 | retval = pcibios_add_platform_entries(pdev); |
921 | if (retval) | |
217f45de | 922 | goto err_vga_file; |
b19441af | 923 | |
280c73d3 ZY |
924 | /* add sysfs entries for various capabilities */ |
925 | retval = pci_create_capabilities_sysfs(pdev); | |
926 | if (retval) | |
217f45de | 927 | goto err_vga_file; |
7d715a6c | 928 | |
1da177e4 | 929 | return 0; |
b19441af | 930 | |
217f45de DA |
931 | err_vga_file: |
932 | if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) | |
933 | device_remove_file(&pdev->dev, &vga_attr); | |
a2cd52ca | 934 | err_rom_file: |
280c73d3 | 935 | if (rom_size) { |
94e61088 | 936 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); |
280c73d3 ZY |
937 | kfree(pdev->rom_attr); |
938 | pdev->rom_attr = NULL; | |
939 | } | |
9890b12a ME |
940 | err_resource_files: |
941 | pci_remove_resource_files(pdev); | |
94e61088 | 942 | err_config_file: |
557848c3 | 943 | if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) |
b19441af GKH |
944 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); |
945 | else | |
946 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
947 | err: | |
948 | return retval; | |
1da177e4 LT |
949 | } |
950 | ||
280c73d3 ZY |
951 | static void pci_remove_capabilities_sysfs(struct pci_dev *dev) |
952 | { | |
953 | if (dev->vpd && dev->vpd->attr) { | |
954 | sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); | |
955 | kfree(dev->vpd->attr); | |
956 | } | |
957 | ||
958 | pcie_aspm_remove_sysfs_dev_files(dev); | |
959 | } | |
960 | ||
1da177e4 LT |
961 | /** |
962 | * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files | |
963 | * @pdev: device whose entries we should free | |
964 | * | |
965 | * Cleanup when @pdev is removed from sysfs. | |
966 | */ | |
967 | void pci_remove_sysfs_dev_files(struct pci_dev *pdev) | |
968 | { | |
280c73d3 ZY |
969 | int rom_size = 0; |
970 | ||
d67afe5e DM |
971 | if (!sysfs_initialized) |
972 | return; | |
973 | ||
280c73d3 | 974 | pci_remove_capabilities_sysfs(pdev); |
7d715a6c | 975 | |
557848c3 | 976 | if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) |
1da177e4 LT |
977 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); |
978 | else | |
979 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
980 | ||
981 | pci_remove_resource_files(pdev); | |
982 | ||
280c73d3 ZY |
983 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) |
984 | rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); | |
985 | else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) | |
986 | rom_size = 0x20000; | |
987 | ||
988 | if (rom_size && pdev->rom_attr) { | |
989 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); | |
990 | kfree(pdev->rom_attr); | |
1da177e4 LT |
991 | } |
992 | } | |
993 | ||
994 | static int __init pci_sysfs_init(void) | |
995 | { | |
996 | struct pci_dev *pdev = NULL; | |
b19441af GKH |
997 | int retval; |
998 | ||
1da177e4 | 999 | sysfs_initialized = 1; |
b19441af GKH |
1000 | for_each_pci_dev(pdev) { |
1001 | retval = pci_create_sysfs_dev_files(pdev); | |
151fc5df JL |
1002 | if (retval) { |
1003 | pci_dev_put(pdev); | |
b19441af | 1004 | return retval; |
151fc5df | 1005 | } |
b19441af | 1006 | } |
1da177e4 LT |
1007 | |
1008 | return 0; | |
1009 | } | |
1010 | ||
40ee9e9f | 1011 | late_initcall(pci_sysfs_init); |