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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Procfs interface for the PCI bus.
3 *
4 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
5 */
6
7#include <linux/init.h>
8#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
11#include <linux/proc_fs.h>
12#include <linux/seq_file.h>
Alexey Dobriyanaa0ac362007-07-15 23:40:39 -070013#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <asm/uaccess.h>
15#include <asm/byteorder.h>
Greg KHbc56b9e2005-04-08 14:53:31 +090016#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18static int proc_initialized; /* = 0 */
19
20static loff_t
21proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
22{
Al Viro54de90d2013-06-23 12:29:00 +040023 struct pci_dev *dev = PDE_DATA(file_inode(file));
24 return fixed_size_llseek(file, off, whence, dev->cfg_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025}
26
27static ssize_t
28proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
29{
Al Virod9dda782013-03-31 18:16:14 -040030 struct pci_dev *dev = PDE_DATA(file_inode(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 unsigned int pos = *ppos;
32 unsigned int cnt, size;
33
34 /*
35 * Normal users can read only the standardized portion of the
36 * configuration space as several chips lock up when trying to read
37 * undefined locations (think of Intel PIIX4 as a typical example).
38 */
39
40 if (capable(CAP_SYS_ADMIN))
Al Virod9dda782013-03-31 18:16:14 -040041 size = dev->cfg_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
43 size = 128;
44 else
45 size = 64;
46
47 if (pos >= size)
48 return 0;
49 if (nbytes >= size)
50 nbytes = size;
51 if (pos + nbytes > size)
52 nbytes = size - pos;
53 cnt = nbytes;
54
55 if (!access_ok(VERIFY_WRITE, buf, cnt))
56 return -EINVAL;
57
Huang Yingb3c32c42012-10-25 09:36:03 +080058 pci_config_pm_runtime_get(dev);
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if ((pos & 1) && cnt) {
61 unsigned char val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070062 pci_user_read_config_byte(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 __put_user(val, buf);
64 buf++;
65 pos++;
66 cnt--;
67 }
68
69 if ((pos & 3) && cnt > 2) {
70 unsigned short val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070071 pci_user_read_config_word(dev, pos, &val);
Harvey Harrisonf17a0772008-07-22 14:40:47 -070072 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 buf += 2;
74 pos += 2;
75 cnt -= 2;
76 }
77
78 while (cnt >= 4) {
79 unsigned int val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070080 pci_user_read_config_dword(dev, pos, &val);
Harvey Harrisonf17a0772008-07-22 14:40:47 -070081 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 buf += 4;
83 pos += 4;
84 cnt -= 4;
85 }
86
87 if (cnt >= 2) {
88 unsigned short val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070089 pci_user_read_config_word(dev, pos, &val);
Harvey Harrisonf17a0772008-07-22 14:40:47 -070090 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 buf += 2;
92 pos += 2;
93 cnt -= 2;
94 }
95
96 if (cnt) {
97 unsigned char val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070098 pci_user_read_config_byte(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 __put_user(val, buf);
100 buf++;
101 pos++;
102 cnt--;
103 }
104
Huang Yingb3c32c42012-10-25 09:36:03 +0800105 pci_config_pm_runtime_put(dev);
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 *ppos = pos;
108 return nbytes;
109}
110
111static ssize_t
112proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
113{
Al Viro496ad9a2013-01-23 17:07:38 -0500114 struct inode *ino = file_inode(file);
Al Virod9dda782013-03-31 18:16:14 -0400115 struct pci_dev *dev = PDE_DATA(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 int pos = *ppos;
Al Virod9dda782013-03-31 18:16:14 -0400117 int size = dev->cfg_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 int cnt;
119
120 if (pos >= size)
121 return 0;
122 if (nbytes >= size)
123 nbytes = size;
124 if (pos + nbytes > size)
125 nbytes = size - pos;
126 cnt = nbytes;
127
128 if (!access_ok(VERIFY_READ, buf, cnt))
129 return -EINVAL;
130
Huang Yingb3c32c42012-10-25 09:36:03 +0800131 pci_config_pm_runtime_get(dev);
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if ((pos & 1) && cnt) {
134 unsigned char val;
135 __get_user(val, buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700136 pci_user_write_config_byte(dev, pos, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 buf++;
138 pos++;
139 cnt--;
140 }
141
142 if ((pos & 3) && cnt > 2) {
Harvey Harrisonf17a0772008-07-22 14:40:47 -0700143 __le16 val;
144 __get_user(val, (__le16 __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700145 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 buf += 2;
147 pos += 2;
148 cnt -= 2;
149 }
150
151 while (cnt >= 4) {
Harvey Harrisonf17a0772008-07-22 14:40:47 -0700152 __le32 val;
153 __get_user(val, (__le32 __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700154 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 buf += 4;
156 pos += 4;
157 cnt -= 4;
158 }
159
160 if (cnt >= 2) {
Harvey Harrisonf17a0772008-07-22 14:40:47 -0700161 __le16 val;
162 __get_user(val, (__le16 __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700163 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 buf += 2;
165 pos += 2;
166 cnt -= 2;
167 }
168
169 if (cnt) {
170 unsigned char val;
171 __get_user(val, buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700172 pci_user_write_config_byte(dev, pos, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 buf++;
174 pos++;
175 cnt--;
176 }
177
Huang Yingb3c32c42012-10-25 09:36:03 +0800178 pci_config_pm_runtime_put(dev);
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 *ppos = pos;
Al Virod9dda782013-03-31 18:16:14 -0400181 i_size_write(ino, dev->cfg_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return nbytes;
183}
184
185struct pci_filp_private {
186 enum pci_mmap_state mmap_state;
187 int write_combine;
188};
189
Mathieu Segaudadd77182008-01-10 14:27:12 +0100190static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
191 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Al Virod9dda782013-03-31 18:16:14 -0400193 struct pci_dev *dev = PDE_DATA(file_inode(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194#ifdef HAVE_PCI_MMAP
195 struct pci_filp_private *fpriv = file->private_data;
196#endif /* HAVE_PCI_MMAP */
197 int ret = 0;
198
199 switch (cmd) {
200 case PCIIOC_CONTROLLER:
201 ret = pci_domain_nr(dev->bus);
202 break;
203
204#ifdef HAVE_PCI_MMAP
205 case PCIIOC_MMAP_IS_IO:
206 fpriv->mmap_state = pci_mmap_io;
207 break;
208
209 case PCIIOC_MMAP_IS_MEM:
210 fpriv->mmap_state = pci_mmap_mem;
211 break;
212
213 case PCIIOC_WRITE_COMBINE:
214 if (arg)
215 fpriv->write_combine = 1;
216 else
217 fpriv->write_combine = 0;
218 break;
219
220#endif /* HAVE_PCI_MMAP */
221
222 default:
223 ret = -EINVAL;
224 break;
225 };
226
227 return ret;
228}
229
230#ifdef HAVE_PCI_MMAP
231static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
232{
Al Virod9dda782013-03-31 18:16:14 -0400233 struct pci_dev *dev = PDE_DATA(file_inode(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 struct pci_filp_private *fpriv = file->private_data;
Jesse Barnes9eff02e2008-10-24 10:32:33 -0700235 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if (!capable(CAP_SYS_RAWIO))
238 return -EPERM;
239
Jesse Barnes9eff02e2008-10-24 10:32:33 -0700240 /* Make sure the caller is mapping a real resource for this device */
241 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Martin Wilck3b519e42010-11-10 11:03:21 +0100242 if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
Jesse Barnes9eff02e2008-10-24 10:32:33 -0700243 break;
244 }
245
246 if (i >= PCI_ROM_RESOURCE)
247 return -ENODEV;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 ret = pci_mmap_page_range(dev, vma,
250 fpriv->mmap_state,
251 fpriv->write_combine);
252 if (ret < 0)
253 return ret;
254
255 return 0;
256}
257
258static int proc_bus_pci_open(struct inode *inode, struct file *file)
259{
260 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
261
262 if (!fpriv)
263 return -ENOMEM;
264
265 fpriv->mmap_state = pci_mmap_io;
266 fpriv->write_combine = 0;
267
268 file->private_data = fpriv;
269
270 return 0;
271}
272
273static int proc_bus_pci_release(struct inode *inode, struct file *file)
274{
275 kfree(file->private_data);
276 file->private_data = NULL;
277
278 return 0;
279}
280#endif /* HAVE_PCI_MMAP */
281
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800282static const struct file_operations proc_bus_pci_operations = {
Denis V. Lunevc7705f32008-04-29 01:02:35 -0700283 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 .llseek = proc_bus_pci_lseek,
285 .read = proc_bus_pci_read,
286 .write = proc_bus_pci_write,
Mathieu Segaudadd77182008-01-10 14:27:12 +0100287 .unlocked_ioctl = proc_bus_pci_ioctl,
Arnd Bergmann991f7392010-07-04 00:02:28 +0200288 .compat_ioctl = proc_bus_pci_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289#ifdef HAVE_PCI_MMAP
290 .open = proc_bus_pci_open,
291 .release = proc_bus_pci_release,
292 .mmap = proc_bus_pci_mmap,
293#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
294 .get_unmapped_area = get_pci_unmapped_area,
295#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
296#endif /* HAVE_PCI_MMAP */
297};
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299/* iterator */
300static void *pci_seq_start(struct seq_file *m, loff_t *pos)
301{
302 struct pci_dev *dev = NULL;
303 loff_t n = *pos;
304
305 for_each_pci_dev(dev) {
306 if (!n--)
307 break;
308 }
309 return dev;
310}
311
312static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
313{
314 struct pci_dev *dev = v;
315
316 (*pos)++;
317 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
318 return dev;
319}
320
321static void pci_seq_stop(struct seq_file *m, void *v)
322{
323 if (v) {
324 struct pci_dev *dev = v;
325 pci_dev_put(dev);
326 }
327}
328
329static int show_device(struct seq_file *m, void *v)
330{
331 const struct pci_dev *dev = v;
332 const struct pci_driver *drv;
333 int i;
334
335 if (dev == NULL)
336 return 0;
337
338 drv = pci_dev_driver(dev);
339 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
340 dev->bus->number,
341 dev->devfn,
342 dev->vendor,
343 dev->device,
344 dev->irq);
Yu Zhaofde09c62008-11-22 02:39:32 +0800345
346 /* only print standard and ROM resources to preserve compatibility */
347 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700348 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000349 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700350 seq_printf(m, "\t%16llx",
351 (unsigned long long)(start |
352 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000353 }
Yu Zhaofde09c62008-11-22 02:39:32 +0800354 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700355 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000356 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700357 seq_printf(m, "\t%16llx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 dev->resource[i].start < dev->resource[i].end ?
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700359 (unsigned long long)(end - start) + 1 : 0);
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000360 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 seq_putc(m, '\t');
362 if (drv)
363 seq_printf(m, "%s", drv->name);
364 seq_putc(m, '\n');
365 return 0;
366}
367
Jan Engelhardt02d90fc2008-01-22 20:53:43 +0100368static const struct seq_operations proc_bus_pci_devices_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 .start = pci_seq_start,
370 .next = pci_seq_next,
371 .stop = pci_seq_stop,
372 .show = show_device
373};
374
375static struct proc_dir_entry *proc_bus_pci_dir;
376
377int pci_proc_attach_device(struct pci_dev *dev)
378{
379 struct pci_bus *bus = dev->bus;
380 struct proc_dir_entry *e;
381 char name[16];
382
383 if (!proc_initialized)
384 return -EACCES;
385
386 if (!bus->procdir) {
387 if (pci_proc_domain(bus)) {
388 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
389 bus->number);
390 } else {
391 sprintf(name, "%02x", bus->number);
392 }
393 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
394 if (!bus->procdir)
395 return -ENOMEM;
396 }
397
398 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
Denis V. Lunevc7705f32008-04-29 01:02:35 -0700399 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
400 &proc_bus_pci_operations, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (!e)
402 return -ENOMEM;
David Howells271a15e2013-04-12 00:38:51 +0100403 proc_set_size(e, dev->cfg_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 dev->procent = e;
405
406 return 0;
407}
408
409int pci_proc_detach_device(struct pci_dev *dev)
410{
David Howellsa8ca16e2013-04-12 17:27:28 +0100411 proc_remove(dev->procent);
412 dev->procent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return 0;
414}
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416int pci_proc_detach_bus(struct pci_bus* bus)
417{
David Howellsa8ca16e2013-04-12 17:27:28 +0100418 proc_remove(bus->procdir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return 0;
420}
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
423{
424 return seq_open(file, &proc_bus_pci_devices_op);
425}
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800426static const struct file_operations proc_bus_pci_dev_operations = {
Denis V. Lunevc7705f32008-04-29 01:02:35 -0700427 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 .open = proc_bus_pci_dev_open,
429 .read = seq_read,
430 .llseek = seq_lseek,
431 .release = seq_release,
432};
433
434static int __init pci_proc_init(void)
435{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 struct pci_dev *dev = NULL;
Alexey Dobriyan9c370662008-04-29 01:01:41 -0700437 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
Denis V. Lunevc7705f32008-04-29 01:02:35 -0700438 proc_create("devices", 0, proc_bus_pci_dir,
439 &proc_bus_pci_dev_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 proc_initialized = 1;
Kulikov Vasiliy4e344b12010-07-03 20:04:39 +0400441 for_each_pci_dev(dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 pci_proc_attach_device(dev);
Kulikov Vasiliy4e344b12010-07-03 20:04:39 +0400443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return 0;
445}
446
Robert P. J. Dayeaf61142008-05-11 16:58:53 -0400447device_initcall(pci_proc_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448