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 LT |
101 | __put_user(val, buf); |
102 | buf++; | |
103 | pos++; | |
104 | cnt--; | |
105 | } | |
106 | ||
b3c32c4f HY |
107 | pci_config_pm_runtime_put(dev); |
108 | ||
1da177e4 LT |
109 | *ppos = pos; |
110 | return nbytes; | |
111 | } | |
112 | ||
3c78bc61 RD |
113 | static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf, |
114 | size_t nbytes, loff_t *ppos) | |
1da177e4 | 115 | { |
496ad9aa | 116 | struct inode *ino = file_inode(file); |
359745d7 | 117 | struct pci_dev *dev = pde_data(ino); |
1da177e4 | 118 | int pos = *ppos; |
d9dda78b | 119 | int size = dev->cfg_size; |
eb627e17 MG |
120 | int cnt, ret; |
121 | ||
122 | ret = security_locked_down(LOCKDOWN_PCI_ACCESS); | |
123 | if (ret) | |
124 | return ret; | |
1da177e4 LT |
125 | |
126 | if (pos >= size) | |
127 | return 0; | |
128 | if (nbytes >= size) | |
129 | nbytes = size; | |
130 | if (pos + nbytes > size) | |
131 | nbytes = size - pos; | |
132 | cnt = nbytes; | |
133 | ||
96d4f267 | 134 | if (!access_ok(buf, cnt)) |
1da177e4 LT |
135 | return -EINVAL; |
136 | ||
b3c32c4f HY |
137 | pci_config_pm_runtime_get(dev); |
138 | ||
1da177e4 LT |
139 | if ((pos & 1) && cnt) { |
140 | unsigned char val; | |
141 | __get_user(val, buf); | |
e04b0ea2 | 142 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 LT |
143 | buf++; |
144 | pos++; | |
145 | cnt--; | |
146 | } | |
147 | ||
148 | if ((pos & 3) && cnt > 2) { | |
f17a077e HH |
149 | __le16 val; |
150 | __get_user(val, (__le16 __user *) buf); | |
e04b0ea2 | 151 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
152 | buf += 2; |
153 | pos += 2; | |
154 | cnt -= 2; | |
155 | } | |
156 | ||
157 | while (cnt >= 4) { | |
f17a077e HH |
158 | __le32 val; |
159 | __get_user(val, (__le32 __user *) buf); | |
e04b0ea2 | 160 | pci_user_write_config_dword(dev, pos, le32_to_cpu(val)); |
1da177e4 LT |
161 | buf += 4; |
162 | pos += 4; | |
163 | cnt -= 4; | |
164 | } | |
165 | ||
166 | if (cnt >= 2) { | |
f17a077e HH |
167 | __le16 val; |
168 | __get_user(val, (__le16 __user *) buf); | |
e04b0ea2 | 169 | pci_user_write_config_word(dev, pos, le16_to_cpu(val)); |
1da177e4 LT |
170 | buf += 2; |
171 | pos += 2; | |
172 | cnt -= 2; | |
173 | } | |
174 | ||
175 | if (cnt) { | |
176 | unsigned char val; | |
177 | __get_user(val, buf); | |
e04b0ea2 | 178 | pci_user_write_config_byte(dev, pos, val); |
1da177e4 LT |
179 | buf++; |
180 | pos++; | |
181 | cnt--; | |
182 | } | |
183 | ||
b3c32c4f HY |
184 | pci_config_pm_runtime_put(dev); |
185 | ||
1da177e4 | 186 | *ppos = pos; |
d9dda78b | 187 | i_size_write(ino, dev->cfg_size); |
1da177e4 LT |
188 | return nbytes; |
189 | } | |
190 | ||
191 | struct pci_filp_private { | |
192 | enum pci_mmap_state mmap_state; | |
193 | int write_combine; | |
194 | }; | |
195 | ||
add77184 MS |
196 | static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, |
197 | unsigned long arg) | |
1da177e4 | 198 | { |
359745d7 | 199 | struct pci_dev *dev = pde_data(file_inode(file)); |
1da177e4 LT |
200 | #ifdef HAVE_PCI_MMAP |
201 | struct pci_filp_private *fpriv = file->private_data; | |
202 | #endif /* HAVE_PCI_MMAP */ | |
203 | int ret = 0; | |
204 | ||
eb627e17 MG |
205 | ret = security_locked_down(LOCKDOWN_PCI_ACCESS); |
206 | if (ret) | |
207 | return ret; | |
208 | ||
1da177e4 LT |
209 | switch (cmd) { |
210 | case PCIIOC_CONTROLLER: | |
211 | ret = pci_domain_nr(dev->bus); | |
212 | break; | |
213 | ||
214 | #ifdef HAVE_PCI_MMAP | |
215 | case PCIIOC_MMAP_IS_IO: | |
e854d8b2 DW |
216 | if (!arch_can_pci_mmap_io()) |
217 | return -EINVAL; | |
1da177e4 LT |
218 | fpriv->mmap_state = pci_mmap_io; |
219 | break; | |
220 | ||
221 | case PCIIOC_MMAP_IS_MEM: | |
222 | fpriv->mmap_state = pci_mmap_mem; | |
223 | break; | |
224 | ||
225 | case PCIIOC_WRITE_COMBINE: | |
ae749c7a DW |
226 | if (arch_can_pci_mmap_wc()) { |
227 | if (arg) | |
228 | fpriv->write_combine = 1; | |
229 | else | |
230 | fpriv->write_combine = 0; | |
231 | break; | |
232 | } | |
233 | /* If arch decided it can't, fall through... */ | |
df561f66 | 234 | fallthrough; |
54325d08 | 235 | #endif /* HAVE_PCI_MMAP */ |
1da177e4 LT |
236 | default: |
237 | ret = -EINVAL; | |
238 | break; | |
f7625980 | 239 | } |
1da177e4 LT |
240 | |
241 | return ret; | |
242 | } | |
243 | ||
244 | #ifdef HAVE_PCI_MMAP | |
245 | static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) | |
246 | { | |
359745d7 | 247 | struct pci_dev *dev = pde_data(file_inode(file)); |
1da177e4 | 248 | struct pci_filp_private *fpriv = file->private_data; |
e854d8b2 | 249 | int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM; |
1da177e4 | 250 | |
eb627e17 MG |
251 | if (!capable(CAP_SYS_RAWIO) || |
252 | security_locked_down(LOCKDOWN_PCI_ACCESS)) | |
1da177e4 LT |
253 | return -EPERM; |
254 | ||
e854d8b2 DW |
255 | if (fpriv->mmap_state == pci_mmap_io) { |
256 | if (!arch_can_pci_mmap_io()) | |
257 | return -EINVAL; | |
17caf567 | 258 | res_bit = IORESOURCE_IO; |
e854d8b2 | 259 | } |
17caf567 | 260 | |
9eff02e2 | 261 | /* Make sure the caller is mapping a real resource for this device */ |
c9c13ba4 | 262 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
17caf567 DW |
263 | if (dev->resource[i].flags & res_bit && |
264 | pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) | |
9eff02e2 JB |
265 | break; |
266 | } | |
267 | ||
c9c13ba4 | 268 | if (i >= PCI_STD_NUM_BARS) |
9eff02e2 JB |
269 | return -ENODEV; |
270 | ||
cef4d023 DW |
271 | if (fpriv->mmap_state == pci_mmap_mem && |
272 | fpriv->write_combine) { | |
273 | if (dev->resource[i].flags & IORESOURCE_PREFETCH) | |
274 | write_combine = 1; | |
275 | else | |
276 | return -EINVAL; | |
277 | } | |
dc217d2c DV |
278 | |
279 | if (dev->resource[i].flags & IORESOURCE_MEM && | |
280 | iomem_is_exclusive(dev->resource[i].start)) | |
281 | return -EINVAL; | |
282 | ||
f66e2258 | 283 | ret = pci_mmap_page_range(dev, i, vma, |
3a92c319 | 284 | fpriv->mmap_state, write_combine); |
1da177e4 LT |
285 | if (ret < 0) |
286 | return ret; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int proc_bus_pci_open(struct inode *inode, struct file *file) | |
292 | { | |
293 | struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL); | |
294 | ||
295 | if (!fpriv) | |
296 | return -ENOMEM; | |
297 | ||
298 | fpriv->mmap_state = pci_mmap_io; | |
299 | fpriv->write_combine = 0; | |
300 | ||
301 | file->private_data = fpriv; | |
636b21b5 | 302 | file->f_mapping = iomem_get_mapping(); |
1da177e4 LT |
303 | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int proc_bus_pci_release(struct inode *inode, struct file *file) | |
308 | { | |
309 | kfree(file->private_data); | |
310 | file->private_data = NULL; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | #endif /* HAVE_PCI_MMAP */ | |
315 | ||
97a32539 AD |
316 | static const struct proc_ops proc_bus_pci_ops = { |
317 | .proc_lseek = proc_bus_pci_lseek, | |
318 | .proc_read = proc_bus_pci_read, | |
319 | .proc_write = proc_bus_pci_write, | |
320 | .proc_ioctl = proc_bus_pci_ioctl, | |
321 | #ifdef CONFIG_COMPAT | |
322 | .proc_compat_ioctl = proc_bus_pci_ioctl, | |
323 | #endif | |
1da177e4 | 324 | #ifdef HAVE_PCI_MMAP |
97a32539 AD |
325 | .proc_open = proc_bus_pci_open, |
326 | .proc_release = proc_bus_pci_release, | |
327 | .proc_mmap = proc_bus_pci_mmap, | |
1da177e4 | 328 | #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA |
97a32539 | 329 | .proc_get_unmapped_area = get_pci_unmapped_area, |
1da177e4 LT |
330 | #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */ |
331 | #endif /* HAVE_PCI_MMAP */ | |
332 | }; | |
333 | ||
1da177e4 LT |
334 | /* iterator */ |
335 | static void *pci_seq_start(struct seq_file *m, loff_t *pos) | |
336 | { | |
337 | struct pci_dev *dev = NULL; | |
338 | loff_t n = *pos; | |
339 | ||
340 | for_each_pci_dev(dev) { | |
341 | if (!n--) | |
342 | break; | |
343 | } | |
344 | return dev; | |
345 | } | |
346 | ||
347 | static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
348 | { | |
349 | struct pci_dev *dev = v; | |
350 | ||
351 | (*pos)++; | |
352 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | |
353 | return dev; | |
354 | } | |
355 | ||
356 | static void pci_seq_stop(struct seq_file *m, void *v) | |
357 | { | |
358 | if (v) { | |
359 | struct pci_dev *dev = v; | |
360 | pci_dev_put(dev); | |
361 | } | |
362 | } | |
363 | ||
364 | static int show_device(struct seq_file *m, void *v) | |
365 | { | |
366 | const struct pci_dev *dev = v; | |
367 | const struct pci_driver *drv; | |
368 | int i; | |
369 | ||
370 | if (dev == NULL) | |
371 | return 0; | |
372 | ||
373 | drv = pci_dev_driver(dev); | |
374 | seq_printf(m, "%02x%02x\t%04x%04x\t%x", | |
375 | dev->bus->number, | |
376 | dev->devfn, | |
377 | dev->vendor, | |
378 | dev->device, | |
379 | dev->irq); | |
fde09c6d YZ |
380 | |
381 | /* only print standard and ROM resources to preserve compatibility */ | |
382 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { | |
e31dd6e4 | 383 | resource_size_t start, end; |
2311b1f2 | 384 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 GKH |
385 | seq_printf(m, "\t%16llx", |
386 | (unsigned long long)(start | | |
387 | (dev->resource[i].flags & PCI_REGION_FLAG_MASK))); | |
2311b1f2 | 388 | } |
fde09c6d | 389 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
e31dd6e4 | 390 | resource_size_t start, end; |
2311b1f2 | 391 | pci_resource_to_user(dev, i, &dev->resource[i], &start, &end); |
1396a8c3 | 392 | seq_printf(m, "\t%16llx", |
1da177e4 | 393 | dev->resource[i].start < dev->resource[i].end ? |
1396a8c3 | 394 | (unsigned long long)(end - start) + 1 : 0); |
2311b1f2 | 395 | } |
1da177e4 LT |
396 | seq_putc(m, '\t'); |
397 | if (drv) | |
590a18e1 | 398 | seq_puts(m, drv->name); |
1da177e4 LT |
399 | seq_putc(m, '\n'); |
400 | return 0; | |
401 | } | |
402 | ||
02d90fc3 | 403 | static const struct seq_operations proc_bus_pci_devices_op = { |
1da177e4 LT |
404 | .start = pci_seq_start, |
405 | .next = pci_seq_next, | |
406 | .stop = pci_seq_stop, | |
407 | .show = show_device | |
408 | }; | |
409 | ||
410 | static struct proc_dir_entry *proc_bus_pci_dir; | |
411 | ||
412 | int pci_proc_attach_device(struct pci_dev *dev) | |
413 | { | |
414 | struct pci_bus *bus = dev->bus; | |
415 | struct proc_dir_entry *e; | |
416 | char name[16]; | |
417 | ||
418 | if (!proc_initialized) | |
419 | return -EACCES; | |
420 | ||
421 | if (!bus->procdir) { | |
422 | if (pci_proc_domain(bus)) { | |
423 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), | |
424 | bus->number); | |
425 | } else { | |
426 | sprintf(name, "%02x", bus->number); | |
427 | } | |
428 | bus->procdir = proc_mkdir(name, proc_bus_pci_dir); | |
429 | if (!bus->procdir) | |
430 | return -ENOMEM; | |
431 | } | |
432 | ||
433 | sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); | |
c7705f34 | 434 | e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir, |
97a32539 | 435 | &proc_bus_pci_ops, dev); |
1da177e4 LT |
436 | if (!e) |
437 | return -ENOMEM; | |
271a15ea | 438 | proc_set_size(e, dev->cfg_size); |
1da177e4 LT |
439 | dev->procent = e; |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | int pci_proc_detach_device(struct pci_dev *dev) | |
445 | { | |
a8ca16ea DH |
446 | proc_remove(dev->procent); |
447 | dev->procent = NULL; | |
1da177e4 LT |
448 | return 0; |
449 | } | |
450 | ||
3c78bc61 | 451 | int pci_proc_detach_bus(struct pci_bus *bus) |
1da177e4 | 452 | { |
a8ca16ea | 453 | proc_remove(bus->procdir); |
1da177e4 LT |
454 | return 0; |
455 | } | |
456 | ||
1da177e4 LT |
457 | static int __init pci_proc_init(void) |
458 | { | |
1da177e4 | 459 | struct pci_dev *dev = NULL; |
9c37066d | 460 | proc_bus_pci_dir = proc_mkdir("bus/pci", NULL); |
fddda2b7 CH |
461 | proc_create_seq("devices", 0, proc_bus_pci_dir, |
462 | &proc_bus_pci_devices_op); | |
1da177e4 | 463 | proc_initialized = 1; |
4e344b1c | 464 | for_each_pci_dev(dev) |
1da177e4 | 465 | pci_proc_attach_device(dev); |
4e344b1c | 466 | |
1da177e4 LT |
467 | return 0; |
468 | } | |
eaf61142 | 469 | device_initcall(pci_proc_init); |