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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Alexey Dobriyanaa0ac362007-07-15 23:40:39 -070014#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/uaccess.h>
16#include <asm/byteorder.h>
Greg KHbc56b9e2005-04-08 14:53:31 +090017#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19static int proc_initialized; /* = 0 */
20
21static loff_t
22proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
23{
24 loff_t new = -1;
Josef Sipek46cc65a2006-12-08 02:37:28 -080025 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080027 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 switch (whence) {
29 case 0:
30 new = off;
31 break;
32 case 1:
33 new = file->f_pos + off;
34 break;
35 case 2:
36 new = inode->i_size + off;
37 break;
38 }
39 if (new < 0 || new > inode->i_size)
40 new = -EINVAL;
41 else
42 file->f_pos = new;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080043 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 return new;
45}
46
47static ssize_t
48proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
49{
Josef Sipek46cc65a2006-12-08 02:37:28 -080050 const struct inode *ino = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 const struct proc_dir_entry *dp = PDE(ino);
52 struct pci_dev *dev = dp->data;
53 unsigned int pos = *ppos;
54 unsigned int cnt, size;
55
56 /*
57 * Normal users can read only the standardized portion of the
58 * configuration space as several chips lock up when trying to read
59 * undefined locations (think of Intel PIIX4 as a typical example).
60 */
61
62 if (capable(CAP_SYS_ADMIN))
David Rientjescd686022007-09-27 13:41:16 -070063 size = dp->size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
65 size = 128;
66 else
67 size = 64;
68
69 if (pos >= size)
70 return 0;
71 if (nbytes >= size)
72 nbytes = size;
73 if (pos + nbytes > size)
74 nbytes = size - pos;
75 cnt = nbytes;
76
77 if (!access_ok(VERIFY_WRITE, buf, cnt))
78 return -EINVAL;
79
80 if ((pos & 1) && cnt) {
81 unsigned char val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070082 pci_user_read_config_byte(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 __put_user(val, buf);
84 buf++;
85 pos++;
86 cnt--;
87 }
88
89 if ((pos & 3) && cnt > 2) {
90 unsigned short val;
Brian Kinge04b0ea2005-09-27 01:21:55 -070091 pci_user_read_config_word(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
93 buf += 2;
94 pos += 2;
95 cnt -= 2;
96 }
97
98 while (cnt >= 4) {
99 unsigned int val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700100 pci_user_read_config_dword(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
102 buf += 4;
103 pos += 4;
104 cnt -= 4;
105 }
106
107 if (cnt >= 2) {
108 unsigned short val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700109 pci_user_read_config_word(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
111 buf += 2;
112 pos += 2;
113 cnt -= 2;
114 }
115
116 if (cnt) {
117 unsigned char val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700118 pci_user_read_config_byte(dev, pos, &val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 __put_user(val, buf);
120 buf++;
121 pos++;
122 cnt--;
123 }
124
125 *ppos = pos;
126 return nbytes;
127}
128
129static ssize_t
130proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
131{
David Rientjesecb39082007-09-27 13:41:17 -0700132 struct inode *ino = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 const struct proc_dir_entry *dp = PDE(ino);
134 struct pci_dev *dev = dp->data;
135 int pos = *ppos;
David Rientjescd686022007-09-27 13:41:16 -0700136 int size = dp->size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 int cnt;
138
139 if (pos >= size)
140 return 0;
141 if (nbytes >= size)
142 nbytes = size;
143 if (pos + nbytes > size)
144 nbytes = size - pos;
145 cnt = nbytes;
146
147 if (!access_ok(VERIFY_READ, buf, cnt))
148 return -EINVAL;
149
150 if ((pos & 1) && cnt) {
151 unsigned char val;
152 __get_user(val, buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700153 pci_user_write_config_byte(dev, pos, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 buf++;
155 pos++;
156 cnt--;
157 }
158
159 if ((pos & 3) && cnt > 2) {
160 unsigned short val;
161 __get_user(val, (unsigned short __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700162 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 buf += 2;
164 pos += 2;
165 cnt -= 2;
166 }
167
168 while (cnt >= 4) {
169 unsigned int val;
170 __get_user(val, (unsigned int __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700171 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 buf += 4;
173 pos += 4;
174 cnt -= 4;
175 }
176
177 if (cnt >= 2) {
178 unsigned short val;
179 __get_user(val, (unsigned short __user *) buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700180 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 buf += 2;
182 pos += 2;
183 cnt -= 2;
184 }
185
186 if (cnt) {
187 unsigned char val;
188 __get_user(val, buf);
Brian Kinge04b0ea2005-09-27 01:21:55 -0700189 pci_user_write_config_byte(dev, pos, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 buf++;
191 pos++;
192 cnt--;
193 }
194
195 *ppos = pos;
David Rientjesecb39082007-09-27 13:41:17 -0700196 i_size_write(ino, dp->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return nbytes;
198}
199
200struct pci_filp_private {
201 enum pci_mmap_state mmap_state;
202 int write_combine;
203};
204
205static 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
246static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
247{
Josef Sipek46cc65a2006-12-08 02:37:28 -0800248 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 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
266static 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
281static 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
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800290static const struct file_operations proc_bus_pci_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 .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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/* iterator */
306static 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
318static 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
327static 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
335static 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 */
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000352 for (i=0; i<7; i++) {
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700353 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000354 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700355 seq_printf(m, "\t%16llx",
356 (unsigned long long)(start |
357 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000358 }
359 for (i=0; i<7; i++) {
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700360 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000361 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700362 seq_printf(m, "\t%16llx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 dev->resource[i].start < dev->resource[i].end ?
Greg Kroah-Hartman1396a8c2006-06-12 15:14:29 -0700364 (unsigned long long)(end - start) + 1 : 0);
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 seq_putc(m, '\t');
367 if (drv)
368 seq_printf(m, "%s", drv->name);
369 seq_putc(m, '\n');
370 return 0;
371}
372
373static 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
380static struct proc_dir_entry *proc_bus_pci_dir;
381
382int 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
415int 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
Adrian Bunk54c762f2005-12-22 01:08:52 +0100428#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429int 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}
Adrian Bunk54c762f2005-12-22 01:08:52 +0100445#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
456{
457 return seq_open(file, &proc_bus_pci_devices_op);
458}
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800459static const struct file_operations proc_bus_pci_dev_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 .open = proc_bus_pci_dev_open,
461 .read = seq_read,
462 .llseek = seq_lseek,
463 .release = seq_release,
464};
465
466static 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 return 0;
479}
480
481__initcall(pci_proc_init);
482
483#ifdef CONFIG_HOTPLUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484EXPORT_SYMBOL(pci_proc_detach_bus);
485#endif
486