Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
df62ab5e | 3 | * Procfs interface for the PCI bus |
1da177e4 | 4 | * |
df62ab5e | 5 | * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz> |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/pci.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/proc_fs.h> | |
13 | #include <linux/seq_file.h> | |
aa0ac365 | 14 | #include <linux/capability.h> |
7c0f6ba6 | 15 | #include <linux/uaccess.h> |
eb627e17 | 16 | #include <linux/security.h> |
1da177e4 | 17 | #include <asm/byteorder.h> |
bc56b9e0 | 18 | #include "pci.h" |
1da177e4 LT |
19 | |
20 | static int proc_initialized; /* = 0 */ | |
21 | ||
3c78bc61 | 22 | static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence) |
1da177e4 | 23 | { |
359745d7 | 24 | struct pci_dev *dev = pde_data(file_inode(file)); |
54de90d6 | 25 | return fixed_size_llseek(file, off, whence, dev->cfg_size); |
1da177e4 LT |
26 | } |
27 | ||
3c78bc61 RD |
28 | static ssize_t proc_bus_pci_read(struct file *file, char __user *buf, |
29 | size_t nbytes, loff_t *ppos) | |
1da177e4 | 30 | { |
359745d7 | 31 | struct pci_dev *dev = pde_data(file_inode(file)); |
1da177e4 LT |
32 | unsigned int pos = *ppos; |
33 | unsigned int cnt, size; | |
34 | ||
35 | /* | |
36 | * Normal users can read only the standardized portion of the | |
37 | * configuration space as several chips lock up when trying to read | |
38 | * undefined locations (think of Intel PIIX4 as a typical example). | |
39 | */ | |
40 | ||
41 | if (capable(CAP_SYS_ADMIN)) | |
d9dda78b | 42 | size = dev->cfg_size; |
1da177e4 LT |
43 | else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
44 | size = 128; | |
45 | else | |
46 | size = 64; | |
47 | ||
48 | if (pos >= size) | |
49 | return 0; | |
50 | if (nbytes >= size) | |
51 | nbytes = size; | |
52 | if (pos + nbytes > size) | |
53 | nbytes = size - pos; | |
54 | cnt = nbytes; | |
55 | ||
96d4f267 | 56 | if (!access_ok(buf, cnt)) |
1da177e4 LT |
57 | return -EINVAL; |
58 | ||
b3c32c4f HY |
59 | pci_config_pm_runtime_get(dev); |
60 | ||
1da177e4 LT |
61 | if ((pos & 1) && cnt) { |
62 | unsigned char val; | |
e04b0ea2 | 63 | pci_user_read_config_byte(dev, pos, &val); |
1da177e4 LT |
64 | __put_user(val, buf); |
65 | buf++; | |
66 | pos++; | |
67 | cnt--; | |
68 | } | |
69 | ||
70 | if ((pos & 3) && cnt > 2) { | |
71 | unsigned short val; | |
e04b0ea2 | 72 | pci_user_read_config_word(dev, pos, &val); |
f17a077e | 73 | __put_user(cpu_to_le16(val), (__le16 __user *) buf); |
1da177e4 LT |
74 | buf += 2; |
75 | pos += 2; | |
76 | cnt -= 2; | |
77 | } | |
78 | ||
79 | while (cnt >= 4) { | |
80 | unsigned int val; | |
e04b0ea2 | 81 | pci_user_read_config_dword(dev, pos, &val); |
f17a077e | 82 | __put_user(cpu_to_le32(val), (__le32 __user *) buf); |
1da177e4 LT |
83 | buf += 4; |
84 | pos += 4; | |
85 | cnt -= 4; | |
a153e5e1 | 86 | cond_resched(); |
1da177e4 LT |
87 | } |
88 | ||
89 | if (cnt >= 2) { | |
90 | unsigned short val; | |
e04b0ea2 | 91 | pci_user_read_config_word(dev, pos, &val); |
f17a077e | 92 | __put_user(cpu_to_le16(val), (__le16 __user *) buf); |
1da177e4 LT |
93 | buf += 2; |
94 | pos += 2; | |
95 | cnt -= 2; | |
96 | } | |
97 | ||
98 | if (cnt) { | |
99 | unsigned char val; | |
e04b0ea2 | 100 | pci_user_read_config_byte(dev, pos, &val); |
1da177e4 | 101 | __put_user(val, buf); |
1da177e4 | 102 | pos++; |
1da177e4 LT |
103 | } |
104 | ||
b3c32c4f HY |
105 | pci_config_pm_runtime_put(dev); |
106 | ||
1da177e4 LT |
107 | *ppos = pos; |
108 | return nbytes; | |
109 | } | |
110 | ||
3c78bc61 RD |
111 | static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf, |
112 | size_t nbytes, loff_t *ppos) | |
1da177e4 | 113 | { |
496ad9aa | 114 | struct inode *ino = file_inode(file); |
359745d7 | 115 | struct pci_dev *dev = pde_data(ino); |
1da177e4 | 116 | int pos = *ppos; |
d9dda78b | 117 | int size = dev->cfg_size; |
eb627e17 MG |
118 | int cnt, ret; |
119 | ||
120 | ret = security_locked_down(LOCKDOWN_PCI_ACCESS); | |
121 | if (ret) | |
122 | return ret; | |
1da177e4 LT |
123 | |
124 | if (pos >= size) | |
125 | return 0; | |
126 | if (nbytes >= size) | |
127 | nbytes = size; | |
128 | if (pos + nbytes > size) | |
129 | nbytes = size - pos; | |
130 | cnt = nbytes; | |
131 | ||
96d4f267 | 132 | if (!access_ok(buf, cnt)) |
1da177e4 LT |
133 | return -EINVAL; |
134 | ||
b3c32c4f HY |
135 | pci_config_pm_runtime_get(dev); |
136 | ||
1da177e4 LT |
137 | if ((pos & 1) && cnt) { |
138 | unsigned char val; | |
139 | __get_user(val, buf); | |
e04b0ea2 | 140 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 LT |
141 | buf++; |
142 | pos++; | |
143 | cnt--; | |
144 | } | |
145 | ||
146 | if ((pos & 3) && cnt > 2) { | |
f17a077e HH |
147 | __le16 val; |
148 | __get_user(val, (__le16 __user *) buf); | |
e04b0ea2 | 149 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
150 | buf += 2; |
151 | pos += 2; | |
152 | cnt -= 2; | |
153 | } | |
154 | ||
155 | while (cnt >= 4) { | |
f17a077e HH |
156 | __le32 val; |
157 | __get_user(val, (__le32 __user *) buf); | |
e04b0ea2 | 158 | pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); |
1da177e4 LT |
159 | buf += 4; |
160 | pos += 4; | |
161 | cnt -= 4; | |
162 | } | |
163 | ||
164 | if (cnt >= 2) { | |
f17a077e HH |
165 | __le16 val; |
166 | __get_user(val, (__le16 __user *) buf); | |
e04b0ea2 | 167 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
168 | buf += 2; |
169 | pos += 2; | |
170 | cnt -= 2; | |
171 | } | |
172 | ||
173 | if (cnt) { | |
174 | unsigned char val; | |
175 | __get_user(val, buf); | |
e04b0ea2 | 176 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 | 177 | pos++; |
1da177e4 LT |
178 | } |
179 | ||
b3c32c4f HY |
180 | pci_config_pm_runtime_put(dev); |
181 | ||
1da177e4 | 182 | *ppos = pos; |
d9dda78b | 183 | i_size_write(ino, dev->cfg_size); |
1da177e4 LT |
184 | return nbytes; |
185 | } | |
186 | ||
cb2d0f84 | 187 | #ifdef HAVE_PCI_MMAP |
1da177e4 LT |
188 | struct pci_filp_private { |
189 | enum pci_mmap_state mmap_state; | |
190 | int write_combine; | |
191 | }; | |
cb2d0f84 | 192 | #endif /* HAVE_PCI_MMAP */ |
1da177e4 | 193 | |
add77184 MS |
194 | static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, |
195 | unsigned long arg) | |
1da177e4 | 196 | { |
359745d7 | 197 | struct pci_dev *dev = pde_data(file_inode(file)); |
1da177e4 LT |
198 | #ifdef HAVE_PCI_MMAP |
199 | struct pci_filp_private *fpriv = file->private_data; | |
200 | #endif /* HAVE_PCI_MMAP */ | |
201 | int ret = 0; | |
202 | ||
eb627e17 MG |
203 | ret = security_locked_down(LOCKDOWN_PCI_ACCESS); |
204 | if (ret) | |
205 | return ret; | |
206 | ||
1da177e4 LT |
207 | switch (cmd) { |
208 | case PCIIOC_CONTROLLER: | |
209 | ret = pci_domain_nr(dev->bus); | |
210 | break; | |
211 | ||
212 | #ifdef HAVE_PCI_MMAP | |
213 | case PCIIOC_MMAP_IS_IO: | |
e854d8b2 DW |
214 | if (!arch_can_pci_mmap_io()) |
215 | return -EINVAL; | |
1da177e4 LT |
216 | fpriv->mmap_state = pci_mmap_io; |
217 | break; | |
218 | ||
219 | case PCIIOC_MMAP_IS_MEM: | |
220 | fpriv->mmap_state = pci_mmap_mem; | |
221 | break; | |
222 | ||
223 | case PCIIOC_WRITE_COMBINE: | |
ae749c7a DW |
224 | if (arch_can_pci_mmap_wc()) { |
225 | if (arg) | |
226 | fpriv->write_combine = 1; | |
227 | else | |
228 | fpriv->write_combine = 0; | |
229 | break; | |
230 | } | |
231 | /* If arch decided it can't, fall through... */ | |
df561f66 | 232 | fallthrough; |
54325d08 | 233 | #endif /* HAVE_PCI_MMAP */ |
1da177e4 LT |
234 | default: |
235 | ret = -EINVAL; | |
236 | break; | |
f7625980 | 237 | } |
1da177e4 LT |
238 | |
239 | return ret; | |
240 | } | |
241 | ||
242 | #ifdef HAVE_PCI_MMAP | |
243 | static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) | |
244 | { | |
359745d7 | 245 | struct pci_dev *dev = pde_data(file_inode(file)); |
1da177e4 | 246 | struct pci_filp_private *fpriv = file->private_data; |
0ad722f1 | 247 | resource_size_t start, end; |
e854d8b2 | 248 | int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM; |
1da177e4 | 249 | |
eb627e17 MG |
250 | if (!capable(CAP_SYS_RAWIO) || |
251 | security_locked_down(LOCKDOWN_PCI_ACCESS)) | |
1da177e4 LT |
252 | return -EPERM; |
253 | ||
e854d8b2 DW |
254 | if (fpriv->mmap_state == pci_mmap_io) { |
255 | if (!arch_can_pci_mmap_io()) | |
256 | return -EINVAL; | |
17caf567 | 257 | res_bit = IORESOURCE_IO; |
e854d8b2 | 258 | } |
17caf567 | 259 | |
9eff02e2 | 260 | /* Make sure the caller is mapping a real resource for this device */ |
c9c13ba4 | 261 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
17caf567 DW |
262 | if (dev->resource[i].flags & res_bit && |
263 | pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) | |
9eff02e2 JB |
264 | break; |
265 | } | |
266 | ||
c9c13ba4 | 267 | if (i >= PCI_STD_NUM_BARS) |
9eff02e2 JB |
268 | return -ENODEV; |
269 | ||
cef4d023 DW |
270 | if (fpriv->mmap_state == pci_mmap_mem && |
271 | fpriv->write_combine) { | |
272 | if (dev->resource[i].flags & IORESOURCE_PREFETCH) | |
273 | write_combine = 1; | |
274 | else | |
275 | return -EINVAL; | |
276 | } | |
dc217d2c DV |
277 | |
278 | if (dev->resource[i].flags & IORESOURCE_MEM && | |
279 | iomem_is_exclusive(dev->resource[i].start)) | |
280 | return -EINVAL; | |
281 | ||
0ad722f1 AB |
282 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
283 | ||
284 | /* Adjust vm_pgoff to be the offset within the resource */ | |
285 | vma->vm_pgoff -= start >> PAGE_SHIFT; | |
286 | ret = pci_mmap_resource_range(dev, i, vma, | |
3a92c319 | 287 | fpriv->mmap_state, write_combine); |
1da177e4 LT |
288 | if (ret < 0) |
289 | return ret; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | static int proc_bus_pci_open(struct inode *inode, struct file *file) | |
295 | { | |
296 | struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); | |
297 | ||
298 | if (!fpriv) | |
299 | return -ENOMEM; | |
300 | ||
301 | fpriv->mmap_state = pci_mmap_io; | |
302 | fpriv->write_combine = 0; | |
303 | ||
304 | file->private_data = fpriv; | |
636b21b5 | 305 | file->f_mapping = iomem_get_mapping(); |
1da177e4 LT |
306 | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int proc_bus_pci_release(struct inode *inode, struct file *file) | |
311 | { | |
312 | kfree(file->private_data); | |
313 | file->private_data = NULL; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | #endif /* HAVE_PCI_MMAP */ | |
318 | ||
97a32539 AD |
319 | static const struct proc_ops proc_bus_pci_ops = { |
320 | .proc_lseek = proc_bus_pci_lseek, | |
321 | .proc_read = proc_bus_pci_read, | |
322 | .proc_write = proc_bus_pci_write, | |
323 | .proc_ioctl = proc_bus_pci_ioctl, | |
324 | #ifdef CONFIG_COMPAT | |
325 | .proc_compat_ioctl = proc_bus_pci_ioctl, | |
326 | #endif | |
1da177e4 | 327 | #ifdef HAVE_PCI_MMAP |
97a32539 AD |
328 | .proc_open = proc_bus_pci_open, |
329 | .proc_release = proc_bus_pci_release, | |
330 | .proc_mmap = proc_bus_pci_mmap, | |
1da177e4 | 331 | #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA |
97a32539 | 332 | .proc_get_unmapped_area = get_pci_unmapped_area, |
1da177e4 LT |
333 | #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ |
334 | #endif /* HAVE_PCI_MMAP */ | |
335 | }; | |
336 | ||
1da177e4 LT |
337 | /* iterator */ |
338 | static void *pci_seq_start(struct seq_file *m, loff_t *pos) | |
339 | { | |
340 | struct pci_dev *dev = NULL; | |
341 | loff_t n = *pos; | |
342 | ||
343 | for_each_pci_dev(dev) { | |
344 | if (!n--) | |
345 | break; | |
346 | } | |
347 | return dev; | |
348 | } | |
349 | ||
350 | static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
351 | { | |
352 | struct pci_dev *dev = v; | |
353 | ||
354 | (*pos)++; | |
355 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | |
356 | return dev; | |
357 | } | |
358 | ||
359 | static void pci_seq_stop(struct seq_file *m, void *v) | |
360 | { | |
361 | if (v) { | |
362 | struct pci_dev *dev = v; | |
363 | pci_dev_put(dev); | |
364 | } | |
365 | } | |
366 | ||
367 | static int show_device(struct seq_file *m, void *v) | |
368 | { | |
369 | const struct pci_dev *dev = v; | |
370 | const struct pci_driver *drv; | |
371 | int i; | |
372 | ||
373 | if (dev == NULL) | |
374 | return 0; | |
375 | ||
376 | drv = pci_dev_driver(dev); | |
377 | seq_printf(m, "%02x%02x\t%04x%04x\t%x", | |
378 | dev->bus->number, | |
379 | dev->devfn, | |
380 | dev->vendor, | |
381 | dev->device, | |
382 | dev->irq); | |
fde09c6d YZ |
383 | |
384 | /* only print standard and ROM resources to preserve compatibility */ | |
385 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { | |
e31dd6e4 | 386 | resource_size_t start, end; |
2311b1f2 | 387 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 GKH |
388 | seq_printf(m, "\t%16llx", |
389 | (unsigned long long)(start | | |
390 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
2311b1f2 | 391 | } |
fde09c6d | 392 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
e31dd6e4 | 393 | resource_size_t start, end; |
2311b1f2 | 394 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 | 395 | seq_printf(m, "\t%16llx", |
1da177e4 | 396 | dev->resource[i].start < dev->resource[i].end ? |
1396a8c3 | 397 | (unsigned long long)(end - start) + 1 : 0); |
2311b1f2 | 398 | } |
1da177e4 LT |
399 | seq_putc(m, '\t'); |
400 | if (drv) | |
590a18e1 | 401 | seq_puts(m, drv->name); |
1da177e4 LT |
402 | seq_putc(m, '\n'); |
403 | return 0; | |
404 | } | |
405 | ||
02d90fc3 | 406 | static const struct seq_operations proc_bus_pci_devices_op = { |
1da177e4 LT |
407 | .start = pci_seq_start, |
408 | .next = pci_seq_next, | |
409 | .stop = pci_seq_stop, | |
410 | .show = show_device | |
411 | }; | |
412 | ||
413 | static struct proc_dir_entry *proc_bus_pci_dir; | |
414 | ||
415 | int pci_proc_attach_device(struct pci_dev *dev) | |
416 | { | |
417 | struct pci_bus *bus = dev->bus; | |
418 | struct proc_dir_entry *e; | |
419 | char name[16]; | |
420 | ||
421 | if (!proc_initialized) | |
422 | return -EACCES; | |
423 | ||
424 | if (!bus->procdir) { | |
425 | if (pci_proc_domain(bus)) { | |
426 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), | |
427 | bus->number); | |
428 | } else { | |
429 | sprintf(name, "%02x", bus->number); | |
430 | } | |
431 | bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
432 | if (!bus->procdir) | |
433 | return -ENOMEM; | |
434 | } | |
435 | ||
436 | sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
c7705f34 | 437 | e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, |
97a32539 | 438 | &proc_bus_pci_ops, dev); |
1da177e4 LT |
439 | if (!e) |
440 | return -ENOMEM; | |
271a15ea | 441 | proc_set_size(e, dev->cfg_size); |
1da177e4 LT |
442 | dev->procent = e; |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | int pci_proc_detach_device(struct pci_dev *dev) | |
448 | { | |
a8ca16ea DH |
449 | proc_remove(dev->procent); |
450 | dev->procent = NULL; | |
1da177e4 LT |
451 | return 0; |
452 | } | |
453 | ||
3c78bc61 | 454 | int pci_proc_detach_bus(struct pci_bus *bus) |
1da177e4 | 455 | { |
a8ca16ea | 456 | proc_remove(bus->procdir); |
1da177e4 LT |
457 | return 0; |
458 | } | |
459 | ||
1da177e4 LT |
460 | static int __init pci_proc_init(void) |
461 | { | |
1da177e4 | 462 | struct pci_dev *dev = NULL; |
9c37066d | 463 | proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); |
fddda2b7 CH |
464 | proc_create_seq("devices", 0, proc_bus_pci_dir, |
465 | &proc_bus_pci_devices_op); | |
1da177e4 | 466 | proc_initialized = 1; |
4e344b1c | 467 | for_each_pci_dev(dev) |
1da177e4 | 468 | pci_proc_attach_device(dev); |
4e344b1c | 469 | |
1da177e4 LT |
470 | return 0; |
471 | } | |
eaf61142 | 472 | device_initcall(pci_proc_init); |