Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $ | |
3 | * | |
4 | * Procfs interface for the PCI bus. | |
5 | * | |
6 | * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz> | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/proc_fs.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/smp_lock.h> | |
15 | ||
16 | #include <asm/uaccess.h> | |
17 | #include <asm/byteorder.h> | |
bc56b9e0 | 18 | #include "pci.h" |
1da177e4 LT |
19 | |
20 | static int proc_initialized; /* = 0 */ | |
21 | ||
22 | static loff_t | |
23 | proc_bus_pci_lseek(struct file *file, loff_t off, int whence) | |
24 | { | |
25 | loff_t new = -1; | |
26 | struct inode *inode = file->f_dentry->d_inode; | |
27 | ||
1b1dcc1b | 28 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
29 | switch (whence) { |
30 | case 0: | |
31 | new = off; | |
32 | break; | |
33 | case 1: | |
34 | new = file->f_pos + off; | |
35 | break; | |
36 | case 2: | |
37 | new = inode->i_size + off; | |
38 | break; | |
39 | } | |
40 | if (new < 0 || new > inode->i_size) | |
41 | new = -EINVAL; | |
42 | else | |
43 | file->f_pos = new; | |
1b1dcc1b | 44 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
45 | return new; |
46 | } | |
47 | ||
48 | static ssize_t | |
49 | proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) | |
50 | { | |
51 | const struct inode *ino = file->f_dentry->d_inode; | |
52 | const struct proc_dir_entry *dp = PDE(ino); | |
53 | struct pci_dev *dev = dp->data; | |
54 | unsigned int pos = *ppos; | |
55 | unsigned int cnt, size; | |
56 | ||
57 | /* | |
58 | * Normal users can read only the standardized portion of the | |
59 | * configuration space as several chips lock up when trying to read | |
60 | * undefined locations (think of Intel PIIX4 as a typical example). | |
61 | */ | |
62 | ||
63 | if (capable(CAP_SYS_ADMIN)) | |
64 | size = dev->cfg_size; | |
65 | else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
66 | size = 128; | |
67 | else | |
68 | size = 64; | |
69 | ||
70 | if (pos >= size) | |
71 | return 0; | |
72 | if (nbytes >= size) | |
73 | nbytes = size; | |
74 | if (pos + nbytes > size) | |
75 | nbytes = size - pos; | |
76 | cnt = nbytes; | |
77 | ||
78 | if (!access_ok(VERIFY_WRITE, buf, cnt)) | |
79 | return -EINVAL; | |
80 | ||
81 | if ((pos & 1) && cnt) { | |
82 | unsigned char val; | |
e04b0ea2 | 83 | pci_user_read_config_byte(dev, pos, &val); |
1da177e4 LT |
84 | __put_user(val, buf); |
85 | buf++; | |
86 | pos++; | |
87 | cnt--; | |
88 | } | |
89 | ||
90 | if ((pos & 3) && cnt > 2) { | |
91 | unsigned short val; | |
e04b0ea2 | 92 | pci_user_read_config_word(dev, pos, &val); |
1da177e4 LT |
93 | __put_user(cpu_to_le16(val), (unsigned short __user *) buf); |
94 | buf += 2; | |
95 | pos += 2; | |
96 | cnt -= 2; | |
97 | } | |
98 | ||
99 | while (cnt >= 4) { | |
100 | unsigned int val; | |
e04b0ea2 | 101 | pci_user_read_config_dword(dev, pos, &val); |
1da177e4 LT |
102 | __put_user(cpu_to_le32(val), (unsigned int __user *) buf); |
103 | buf += 4; | |
104 | pos += 4; | |
105 | cnt -= 4; | |
106 | } | |
107 | ||
108 | if (cnt >= 2) { | |
109 | unsigned short val; | |
e04b0ea2 | 110 | pci_user_read_config_word(dev, pos, &val); |
1da177e4 LT |
111 | __put_user(cpu_to_le16(val), (unsigned short __user *) buf); |
112 | buf += 2; | |
113 | pos += 2; | |
114 | cnt -= 2; | |
115 | } | |
116 | ||
117 | if (cnt) { | |
118 | unsigned char val; | |
e04b0ea2 | 119 | pci_user_read_config_byte(dev, pos, &val); |
1da177e4 LT |
120 | __put_user(val, buf); |
121 | buf++; | |
122 | pos++; | |
123 | cnt--; | |
124 | } | |
125 | ||
126 | *ppos = pos; | |
127 | return nbytes; | |
128 | } | |
129 | ||
130 | static ssize_t | |
131 | proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos) | |
132 | { | |
133 | const struct inode *ino = file->f_dentry->d_inode; | |
134 | const struct proc_dir_entry *dp = PDE(ino); | |
135 | struct pci_dev *dev = dp->data; | |
136 | int pos = *ppos; | |
137 | int size = dev->cfg_size; | |
138 | int cnt; | |
139 | ||
140 | if (pos >= size) | |
141 | return 0; | |
142 | if (nbytes >= size) | |
143 | nbytes = size; | |
144 | if (pos + nbytes > size) | |
145 | nbytes = size - pos; | |
146 | cnt = nbytes; | |
147 | ||
148 | if (!access_ok(VERIFY_READ, buf, cnt)) | |
149 | return -EINVAL; | |
150 | ||
151 | if ((pos & 1) && cnt) { | |
152 | unsigned char val; | |
153 | __get_user(val, buf); | |
e04b0ea2 | 154 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 LT |
155 | buf++; |
156 | pos++; | |
157 | cnt--; | |
158 | } | |
159 | ||
160 | if ((pos & 3) && cnt > 2) { | |
161 | unsigned short val; | |
162 | __get_user(val, (unsigned short __user *) buf); | |
e04b0ea2 | 163 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
164 | buf += 2; |
165 | pos += 2; | |
166 | cnt -= 2; | |
167 | } | |
168 | ||
169 | while (cnt >= 4) { | |
170 | unsigned int val; | |
171 | __get_user(val, (unsigned int __user *) buf); | |
e04b0ea2 | 172 | pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); |
1da177e4 LT |
173 | buf += 4; |
174 | pos += 4; | |
175 | cnt -= 4; | |
176 | } | |
177 | ||
178 | if (cnt >= 2) { | |
179 | unsigned short val; | |
180 | __get_user(val, (unsigned short __user *) buf); | |
e04b0ea2 | 181 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
182 | buf += 2; |
183 | pos += 2; | |
184 | cnt -= 2; | |
185 | } | |
186 | ||
187 | if (cnt) { | |
188 | unsigned char val; | |
189 | __get_user(val, buf); | |
e04b0ea2 | 190 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 LT |
191 | buf++; |
192 | pos++; | |
193 | cnt--; | |
194 | } | |
195 | ||
196 | *ppos = pos; | |
197 | return nbytes; | |
198 | } | |
199 | ||
200 | struct pci_filp_private { | |
201 | enum pci_mmap_state mmap_state; | |
202 | int write_combine; | |
203 | }; | |
204 | ||
205 | static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
206 | { | |
207 | const struct proc_dir_entry *dp = PDE(inode); | |
208 | struct pci_dev *dev = dp->data; | |
209 | #ifdef HAVE_PCI_MMAP | |
210 | struct pci_filp_private *fpriv = file->private_data; | |
211 | #endif /* HAVE_PCI_MMAP */ | |
212 | int ret = 0; | |
213 | ||
214 | switch (cmd) { | |
215 | case PCIIOC_CONTROLLER: | |
216 | ret = pci_domain_nr(dev->bus); | |
217 | break; | |
218 | ||
219 | #ifdef HAVE_PCI_MMAP | |
220 | case PCIIOC_MMAP_IS_IO: | |
221 | fpriv->mmap_state = pci_mmap_io; | |
222 | break; | |
223 | ||
224 | case PCIIOC_MMAP_IS_MEM: | |
225 | fpriv->mmap_state = pci_mmap_mem; | |
226 | break; | |
227 | ||
228 | case PCIIOC_WRITE_COMBINE: | |
229 | if (arg) | |
230 | fpriv->write_combine = 1; | |
231 | else | |
232 | fpriv->write_combine = 0; | |
233 | break; | |
234 | ||
235 | #endif /* HAVE_PCI_MMAP */ | |
236 | ||
237 | default: | |
238 | ret = -EINVAL; | |
239 | break; | |
240 | }; | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | #ifdef HAVE_PCI_MMAP | |
246 | static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) | |
247 | { | |
248 | struct inode *inode = file->f_dentry->d_inode; | |
249 | const struct proc_dir_entry *dp = PDE(inode); | |
250 | struct pci_dev *dev = dp->data; | |
251 | struct pci_filp_private *fpriv = file->private_data; | |
252 | int ret; | |
253 | ||
254 | if (!capable(CAP_SYS_RAWIO)) | |
255 | return -EPERM; | |
256 | ||
257 | ret = pci_mmap_page_range(dev, vma, | |
258 | fpriv->mmap_state, | |
259 | fpriv->write_combine); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int proc_bus_pci_open(struct inode *inode, struct file *file) | |
267 | { | |
268 | struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); | |
269 | ||
270 | if (!fpriv) | |
271 | return -ENOMEM; | |
272 | ||
273 | fpriv->mmap_state = pci_mmap_io; | |
274 | fpriv->write_combine = 0; | |
275 | ||
276 | file->private_data = fpriv; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static int proc_bus_pci_release(struct inode *inode, struct file *file) | |
282 | { | |
283 | kfree(file->private_data); | |
284 | file->private_data = NULL; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | #endif /* HAVE_PCI_MMAP */ | |
289 | ||
290 | static struct file_operations proc_bus_pci_operations = { | |
291 | .llseek = proc_bus_pci_lseek, | |
292 | .read = proc_bus_pci_read, | |
293 | .write = proc_bus_pci_write, | |
294 | .ioctl = proc_bus_pci_ioctl, | |
295 | #ifdef HAVE_PCI_MMAP | |
296 | .open = proc_bus_pci_open, | |
297 | .release = proc_bus_pci_release, | |
298 | .mmap = proc_bus_pci_mmap, | |
299 | #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA | |
300 | .get_unmapped_area = get_pci_unmapped_area, | |
301 | #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ | |
302 | #endif /* HAVE_PCI_MMAP */ | |
303 | }; | |
304 | ||
1da177e4 LT |
305 | /* iterator */ |
306 | static void *pci_seq_start(struct seq_file *m, loff_t *pos) | |
307 | { | |
308 | struct pci_dev *dev = NULL; | |
309 | loff_t n = *pos; | |
310 | ||
311 | for_each_pci_dev(dev) { | |
312 | if (!n--) | |
313 | break; | |
314 | } | |
315 | return dev; | |
316 | } | |
317 | ||
318 | static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
319 | { | |
320 | struct pci_dev *dev = v; | |
321 | ||
322 | (*pos)++; | |
323 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | |
324 | return dev; | |
325 | } | |
326 | ||
327 | static void pci_seq_stop(struct seq_file *m, void *v) | |
328 | { | |
329 | if (v) { | |
330 | struct pci_dev *dev = v; | |
331 | pci_dev_put(dev); | |
332 | } | |
333 | } | |
334 | ||
335 | static int show_device(struct seq_file *m, void *v) | |
336 | { | |
337 | const struct pci_dev *dev = v; | |
338 | const struct pci_driver *drv; | |
339 | int i; | |
340 | ||
341 | if (dev == NULL) | |
342 | return 0; | |
343 | ||
344 | drv = pci_dev_driver(dev); | |
345 | seq_printf(m, "%02x%02x\t%04x%04x\t%x", | |
346 | dev->bus->number, | |
347 | dev->devfn, | |
348 | dev->vendor, | |
349 | dev->device, | |
350 | dev->irq); | |
351 | /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */ | |
2311b1f2 | 352 | for (i=0; i<7; i++) { |
e31dd6e4 | 353 | resource_size_t start, end; |
2311b1f2 | 354 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 GKH |
355 | seq_printf(m, "\t%16llx", |
356 | (unsigned long long)(start | | |
357 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
2311b1f2 ME |
358 | } |
359 | for (i=0; i<7; i++) { | |
e31dd6e4 | 360 | resource_size_t start, end; |
2311b1f2 | 361 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 | 362 | seq_printf(m, "\t%16llx", |
1da177e4 | 363 | dev->resource[i].start < dev->resource[i].end ? |
1396a8c3 | 364 | (unsigned long long)(end - start) + 1 : 0); |
2311b1f2 | 365 | } |
1da177e4 LT |
366 | seq_putc(m, '\t'); |
367 | if (drv) | |
368 | seq_printf(m, "%s", drv->name); | |
369 | seq_putc(m, '\n'); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static struct seq_operations proc_bus_pci_devices_op = { | |
374 | .start = pci_seq_start, | |
375 | .next = pci_seq_next, | |
376 | .stop = pci_seq_stop, | |
377 | .show = show_device | |
378 | }; | |
379 | ||
380 | static struct proc_dir_entry *proc_bus_pci_dir; | |
381 | ||
382 | int pci_proc_attach_device(struct pci_dev *dev) | |
383 | { | |
384 | struct pci_bus *bus = dev->bus; | |
385 | struct proc_dir_entry *e; | |
386 | char name[16]; | |
387 | ||
388 | if (!proc_initialized) | |
389 | return -EACCES; | |
390 | ||
391 | if (!bus->procdir) { | |
392 | if (pci_proc_domain(bus)) { | |
393 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), | |
394 | bus->number); | |
395 | } else { | |
396 | sprintf(name, "%02x", bus->number); | |
397 | } | |
398 | bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
399 | if (!bus->procdir) | |
400 | return -ENOMEM; | |
401 | } | |
402 | ||
403 | sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
404 | e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir); | |
405 | if (!e) | |
406 | return -ENOMEM; | |
407 | e->proc_fops = &proc_bus_pci_operations; | |
408 | e->data = dev; | |
409 | e->size = dev->cfg_size; | |
410 | dev->procent = e; | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | int pci_proc_detach_device(struct pci_dev *dev) | |
416 | { | |
417 | struct proc_dir_entry *e; | |
418 | ||
419 | if ((e = dev->procent)) { | |
420 | if (atomic_read(&e->count)) | |
421 | return -EBUSY; | |
422 | remove_proc_entry(e->name, dev->bus->procdir); | |
423 | dev->procent = NULL; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
54c762fe | 428 | #if 0 |
1da177e4 LT |
429 | int pci_proc_attach_bus(struct pci_bus* bus) |
430 | { | |
431 | struct proc_dir_entry *de = bus->procdir; | |
432 | ||
433 | if (!proc_initialized) | |
434 | return -EACCES; | |
435 | ||
436 | if (!de) { | |
437 | char name[16]; | |
438 | sprintf(name, "%02x", bus->number); | |
439 | de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
440 | if (!de) | |
441 | return -ENOMEM; | |
442 | } | |
443 | return 0; | |
444 | } | |
54c762fe | 445 | #endif /* 0 */ |
1da177e4 LT |
446 | |
447 | int pci_proc_detach_bus(struct pci_bus* bus) | |
448 | { | |
449 | struct proc_dir_entry *de = bus->procdir; | |
450 | if (de) | |
451 | remove_proc_entry(de->name, proc_bus_pci_dir); | |
452 | return 0; | |
453 | } | |
454 | ||
1da177e4 LT |
455 | static int proc_bus_pci_dev_open(struct inode *inode, struct file *file) |
456 | { | |
457 | return seq_open(file, &proc_bus_pci_devices_op); | |
458 | } | |
459 | static struct file_operations proc_bus_pci_dev_operations = { | |
460 | .open = proc_bus_pci_dev_open, | |
461 | .read = seq_read, | |
462 | .llseek = seq_lseek, | |
463 | .release = seq_release, | |
464 | }; | |
465 | ||
466 | static int __init pci_proc_init(void) | |
467 | { | |
468 | struct proc_dir_entry *entry; | |
469 | struct pci_dev *dev = NULL; | |
470 | proc_bus_pci_dir = proc_mkdir("pci", proc_bus); | |
471 | entry = create_proc_entry("devices", 0, proc_bus_pci_dir); | |
472 | if (entry) | |
473 | entry->proc_fops = &proc_bus_pci_dev_operations; | |
474 | proc_initialized = 1; | |
475 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
476 | pci_proc_attach_device(dev); | |
477 | } | |
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | ||
481 | __initcall(pci_proc_init); | |
482 | ||
483 | #ifdef CONFIG_HOTPLUG | |
484 | EXPORT_SYMBOL(pci_proc_attach_device); | |
1da177e4 LT |
485 | EXPORT_SYMBOL(pci_proc_detach_bus); |
486 | #endif | |
487 |