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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 | ||
18 | #include <linux/config.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/stat.h> | |
22 | #include <linux/topology.h> | |
23 | #include <linux/mm.h> | |
24 | ||
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 \ | |
32 | field##_show(struct device *dev, char *buf) \ | |
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 | ||
47 | static ssize_t local_cpus_show(struct device *dev, char *buf) | |
48 | { | |
49 | cpumask_t mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); | |
50 | int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
51 | strcat(buf,"\n"); | |
52 | return 1+len; | |
53 | } | |
54 | ||
55 | /* show resources */ | |
56 | static ssize_t | |
57 | resource_show(struct device * dev, char * buf) | |
58 | { | |
59 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
60 | char * str = buf; | |
61 | int i; | |
62 | int max = 7; | |
63 | ||
64 | if (pci_dev->subordinate) | |
65 | max = DEVICE_COUNT_RESOURCE; | |
66 | ||
67 | for (i = 0; i < max; i++) { | |
68 | str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n", | |
69 | pci_resource_start(pci_dev,i), | |
70 | pci_resource_end(pci_dev,i), | |
71 | pci_resource_flags(pci_dev,i)); | |
72 | } | |
73 | return (str - buf); | |
74 | } | |
75 | ||
76 | struct device_attribute pci_dev_attrs[] = { | |
77 | __ATTR_RO(resource), | |
78 | __ATTR_RO(vendor), | |
79 | __ATTR_RO(device), | |
80 | __ATTR_RO(subsystem_vendor), | |
81 | __ATTR_RO(subsystem_device), | |
82 | __ATTR_RO(class), | |
83 | __ATTR_RO(irq), | |
84 | __ATTR_RO(local_cpus), | |
85 | __ATTR_NULL, | |
86 | }; | |
87 | ||
88 | static ssize_t | |
89 | pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
90 | { | |
91 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
92 | unsigned int size = 64; | |
93 | loff_t init_off = off; | |
94 | ||
95 | /* Several chips lock up trying to read undefined config space */ | |
96 | if (capable(CAP_SYS_ADMIN)) { | |
97 | size = dev->cfg_size; | |
98 | } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { | |
99 | size = 128; | |
100 | } | |
101 | ||
102 | if (off > size) | |
103 | return 0; | |
104 | if (off + count > size) { | |
105 | size -= off; | |
106 | count = size; | |
107 | } else { | |
108 | size = count; | |
109 | } | |
110 | ||
111 | while (off & 3) { | |
112 | unsigned char val; | |
113 | pci_read_config_byte(dev, off, &val); | |
114 | buf[off - init_off] = val; | |
115 | off++; | |
116 | if (--size == 0) | |
117 | break; | |
118 | } | |
119 | ||
120 | while (size > 3) { | |
121 | unsigned int val; | |
122 | pci_read_config_dword(dev, off, &val); | |
123 | buf[off - init_off] = val & 0xff; | |
124 | buf[off - init_off + 1] = (val >> 8) & 0xff; | |
125 | buf[off - init_off + 2] = (val >> 16) & 0xff; | |
126 | buf[off - init_off + 3] = (val >> 24) & 0xff; | |
127 | off += 4; | |
128 | size -= 4; | |
129 | } | |
130 | ||
131 | while (size > 0) { | |
132 | unsigned char val; | |
133 | pci_read_config_byte(dev, off, &val); | |
134 | buf[off - init_off] = val; | |
135 | off++; | |
136 | --size; | |
137 | } | |
138 | ||
139 | return count; | |
140 | } | |
141 | ||
142 | static ssize_t | |
143 | pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
144 | { | |
145 | struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj)); | |
146 | unsigned int size = count; | |
147 | loff_t init_off = off; | |
148 | ||
149 | if (off > dev->cfg_size) | |
150 | return 0; | |
151 | if (off + count > dev->cfg_size) { | |
152 | size = dev->cfg_size - off; | |
153 | count = size; | |
154 | } | |
155 | ||
156 | while (off & 3) { | |
157 | pci_write_config_byte(dev, off, buf[off - init_off]); | |
158 | off++; | |
159 | if (--size == 0) | |
160 | break; | |
161 | } | |
162 | ||
163 | while (size > 3) { | |
164 | unsigned int val = buf[off - init_off]; | |
165 | val |= (unsigned int) buf[off - init_off + 1] << 8; | |
166 | val |= (unsigned int) buf[off - init_off + 2] << 16; | |
167 | val |= (unsigned int) buf[off - init_off + 3] << 24; | |
168 | pci_write_config_dword(dev, off, val); | |
169 | off += 4; | |
170 | size -= 4; | |
171 | } | |
172 | ||
173 | while (size > 0) { | |
174 | pci_write_config_byte(dev, off, buf[off - init_off]); | |
175 | off++; | |
176 | --size; | |
177 | } | |
178 | ||
179 | return count; | |
180 | } | |
181 | ||
182 | #ifdef HAVE_PCI_LEGACY | |
183 | /** | |
184 | * pci_read_legacy_io - read byte(s) from legacy I/O port space | |
185 | * @kobj: kobject corresponding to file to read from | |
186 | * @buf: buffer to store results | |
187 | * @off: offset into legacy I/O port space | |
188 | * @count: number of bytes to read | |
189 | * | |
190 | * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
191 | * callback routine (pci_legacy_read). | |
192 | */ | |
193 | ssize_t | |
194 | pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
195 | { | |
196 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
197 | struct class_device, | |
198 | kobj)); | |
199 | ||
200 | /* Only support 1, 2 or 4 byte accesses */ | |
201 | if (count != 1 && count != 2 && count != 4) | |
202 | return -EINVAL; | |
203 | ||
204 | return pci_legacy_read(bus, off, (u32 *)buf, count); | |
205 | } | |
206 | ||
207 | /** | |
208 | * pci_write_legacy_io - write byte(s) to legacy I/O port space | |
209 | * @kobj: kobject corresponding to file to read from | |
210 | * @buf: buffer containing value to be written | |
211 | * @off: offset into legacy I/O port space | |
212 | * @count: number of bytes to write | |
213 | * | |
214 | * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific | |
215 | * callback routine (pci_legacy_write). | |
216 | */ | |
217 | ssize_t | |
218 | pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
219 | { | |
220 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
221 | struct class_device, | |
222 | kobj)); | |
223 | /* Only support 1, 2 or 4 byte accesses */ | |
224 | if (count != 1 && count != 2 && count != 4) | |
225 | return -EINVAL; | |
226 | ||
227 | return pci_legacy_write(bus, off, *(u32 *)buf, count); | |
228 | } | |
229 | ||
230 | /** | |
231 | * pci_mmap_legacy_mem - map legacy PCI memory into user memory space | |
232 | * @kobj: kobject corresponding to device to be mapped | |
233 | * @attr: struct bin_attribute for this file | |
234 | * @vma: struct vm_area_struct passed to mmap | |
235 | * | |
236 | * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap | |
237 | * legacy memory space (first meg of bus space) into application virtual | |
238 | * memory space. | |
239 | */ | |
240 | int | |
241 | pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr, | |
242 | struct vm_area_struct *vma) | |
243 | { | |
244 | struct pci_bus *bus = to_pci_bus(container_of(kobj, | |
245 | struct class_device, | |
246 | kobj)); | |
247 | ||
248 | return pci_mmap_legacy_page_range(bus, vma); | |
249 | } | |
250 | #endif /* HAVE_PCI_LEGACY */ | |
251 | ||
252 | #ifdef HAVE_PCI_MMAP | |
253 | /** | |
254 | * pci_mmap_resource - map a PCI resource into user memory space | |
255 | * @kobj: kobject for mapping | |
256 | * @attr: struct bin_attribute for the file being mapped | |
257 | * @vma: struct vm_area_struct passed into the mmap | |
258 | * | |
259 | * Use the regular PCI mapping routines to map a PCI resource into userspace. | |
260 | * FIXME: write combining? maybe automatic for prefetchable regions? | |
261 | */ | |
262 | static int | |
263 | pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, | |
264 | struct vm_area_struct *vma) | |
265 | { | |
266 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, | |
267 | struct device, kobj)); | |
268 | struct resource *res = (struct resource *)attr->private; | |
269 | enum pci_mmap_state mmap_type; | |
270 | ||
271 | vma->vm_pgoff += res->start >> PAGE_SHIFT; | |
272 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; | |
273 | ||
274 | return pci_mmap_page_range(pdev, vma, mmap_type, 0); | |
275 | } | |
276 | ||
277 | /** | |
278 | * pci_create_resource_files - create resource files in sysfs for @dev | |
279 | * @dev: dev in question | |
280 | * | |
281 | * Walk the resources in @dev creating files for each resource available. | |
282 | */ | |
283 | static void | |
284 | pci_create_resource_files(struct pci_dev *pdev) | |
285 | { | |
286 | int i; | |
287 | ||
288 | /* Expose the PCI resources from this device as files */ | |
289 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
290 | struct bin_attribute *res_attr; | |
291 | ||
292 | /* skip empty resources */ | |
293 | if (!pci_resource_len(pdev, i)) | |
294 | continue; | |
295 | ||
296 | res_attr = kmalloc(sizeof(*res_attr) + 10, GFP_ATOMIC); | |
297 | if (res_attr) { | |
298 | memset(res_attr, 0, sizeof(*res_attr) + 10); | |
299 | pdev->res_attr[i] = res_attr; | |
300 | /* Allocated above after the res_attr struct */ | |
301 | res_attr->attr.name = (char *)(res_attr + 1); | |
302 | sprintf(res_attr->attr.name, "resource%d", i); | |
303 | res_attr->size = pci_resource_len(pdev, i); | |
304 | res_attr->attr.mode = S_IRUSR | S_IWUSR; | |
305 | res_attr->attr.owner = THIS_MODULE; | |
306 | res_attr->mmap = pci_mmap_resource; | |
307 | res_attr->private = &pdev->resource[i]; | |
308 | sysfs_create_bin_file(&pdev->dev.kobj, res_attr); | |
309 | } | |
310 | } | |
311 | } | |
312 | ||
313 | /** | |
314 | * pci_remove_resource_files - cleanup resource files | |
315 | * @dev: dev to cleanup | |
316 | * | |
317 | * If we created resource files for @dev, remove them from sysfs and | |
318 | * free their resources. | |
319 | */ | |
320 | static void | |
321 | pci_remove_resource_files(struct pci_dev *pdev) | |
322 | { | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
326 | struct bin_attribute *res_attr; | |
327 | ||
328 | res_attr = pdev->res_attr[i]; | |
329 | if (res_attr) { | |
330 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
331 | kfree(res_attr); | |
332 | } | |
333 | } | |
334 | } | |
335 | #else /* !HAVE_PCI_MMAP */ | |
336 | static inline void pci_create_resource_files(struct pci_dev *dev) { return; } | |
337 | static inline void pci_remove_resource_files(struct pci_dev *dev) { return; } | |
338 | #endif /* HAVE_PCI_MMAP */ | |
339 | ||
340 | /** | |
341 | * pci_write_rom - used to enable access to the PCI ROM display | |
342 | * @kobj: kernel object handle | |
343 | * @buf: user input | |
344 | * @off: file offset | |
345 | * @count: number of byte in input | |
346 | * | |
347 | * writing anything except 0 enables it | |
348 | */ | |
349 | static ssize_t | |
350 | pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
351 | { | |
352 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
353 | ||
354 | if ((off == 0) && (*buf == '0') && (count == 2)) | |
355 | pdev->rom_attr_enabled = 0; | |
356 | else | |
357 | pdev->rom_attr_enabled = 1; | |
358 | ||
359 | return count; | |
360 | } | |
361 | ||
362 | /** | |
363 | * pci_read_rom - read a PCI ROM | |
364 | * @kobj: kernel object handle | |
365 | * @buf: where to put the data we read from the ROM | |
366 | * @off: file offset | |
367 | * @count: number of bytes to read | |
368 | * | |
369 | * Put @count bytes starting at @off into @buf from the ROM in the PCI | |
370 | * device corresponding to @kobj. | |
371 | */ | |
372 | static ssize_t | |
373 | pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count) | |
374 | { | |
375 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj)); | |
376 | void __iomem *rom; | |
377 | size_t size; | |
378 | ||
379 | if (!pdev->rom_attr_enabled) | |
380 | return -EINVAL; | |
381 | ||
382 | rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */ | |
383 | if (!rom) | |
384 | return 0; | |
385 | ||
386 | if (off >= size) | |
387 | count = 0; | |
388 | else { | |
389 | if (off + count > size) | |
390 | count = size - off; | |
391 | ||
392 | memcpy_fromio(buf, rom + off, count); | |
393 | } | |
394 | pci_unmap_rom(pdev, rom); | |
395 | ||
396 | return count; | |
397 | } | |
398 | ||
399 | static struct bin_attribute pci_config_attr = { | |
400 | .attr = { | |
401 | .name = "config", | |
402 | .mode = S_IRUGO | S_IWUSR, | |
403 | .owner = THIS_MODULE, | |
404 | }, | |
405 | .size = 256, | |
406 | .read = pci_read_config, | |
407 | .write = pci_write_config, | |
408 | }; | |
409 | ||
410 | static struct bin_attribute pcie_config_attr = { | |
411 | .attr = { | |
412 | .name = "config", | |
413 | .mode = S_IRUGO | S_IWUSR, | |
414 | .owner = THIS_MODULE, | |
415 | }, | |
416 | .size = 4096, | |
417 | .read = pci_read_config, | |
418 | .write = pci_write_config, | |
419 | }; | |
420 | ||
421 | int pci_create_sysfs_dev_files (struct pci_dev *pdev) | |
422 | { | |
423 | if (!sysfs_initialized) | |
424 | return -EACCES; | |
425 | ||
426 | if (pdev->cfg_size < 4096) | |
427 | sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
428 | else | |
429 | sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
430 | ||
431 | pci_create_resource_files(pdev); | |
432 | ||
433 | /* If the device has a ROM, try to expose it in sysfs. */ | |
434 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) { | |
435 | struct bin_attribute *rom_attr; | |
436 | ||
437 | rom_attr = kmalloc(sizeof(*rom_attr), GFP_ATOMIC); | |
438 | if (rom_attr) { | |
439 | memset(rom_attr, 0x00, sizeof(*rom_attr)); | |
440 | pdev->rom_attr = rom_attr; | |
441 | rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE); | |
442 | rom_attr->attr.name = "rom"; | |
443 | rom_attr->attr.mode = S_IRUSR; | |
444 | rom_attr->attr.owner = THIS_MODULE; | |
445 | rom_attr->read = pci_read_rom; | |
446 | rom_attr->write = pci_write_rom; | |
447 | sysfs_create_bin_file(&pdev->dev.kobj, rom_attr); | |
448 | } | |
449 | } | |
450 | /* add platform-specific attributes */ | |
451 | pcibios_add_platform_entries(pdev); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /** | |
457 | * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files | |
458 | * @pdev: device whose entries we should free | |
459 | * | |
460 | * Cleanup when @pdev is removed from sysfs. | |
461 | */ | |
462 | void pci_remove_sysfs_dev_files(struct pci_dev *pdev) | |
463 | { | |
464 | if (pdev->cfg_size < 4096) | |
465 | sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); | |
466 | else | |
467 | sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); | |
468 | ||
469 | pci_remove_resource_files(pdev); | |
470 | ||
471 | if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) { | |
472 | if (pdev->rom_attr) { | |
473 | sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); | |
474 | kfree(pdev->rom_attr); | |
475 | } | |
476 | } | |
477 | } | |
478 | ||
479 | static int __init pci_sysfs_init(void) | |
480 | { | |
481 | struct pci_dev *pdev = NULL; | |
482 | ||
483 | sysfs_initialized = 1; | |
484 | for_each_pci_dev(pdev) | |
485 | pci_create_sysfs_dev_files(pdev); | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | __initcall(pci_sysfs_init); |