1 /*
2 * 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>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/proc_fs.h>
12 #include <linux/seq_file.h>
13 #include <linux/capability.h>
14 #include <asm/uaccess.h>
15 #include <asm/byteorder.h>
16 #include "pci.h"
17
18 static int proc_initialized; /* = 0 */
19
20 static loff_t
proc_bus_pci_lseek(struct file * file,loff_t off,int whence)21 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
22 {
23 loff_t new = -1;
24 struct inode *inode = file->f_path.dentry->d_inode;
25
26 mutex_lock(&inode->i_mutex);
27 switch (whence) {
28 case 0:
29 new = off;
30 break;
31 case 1:
32 new = file->f_pos + off;
33 break;
34 case 2:
35 new = inode->i_size + off;
36 break;
37 }
38 if (new < 0 || new > inode->i_size)
39 new = -EINVAL;
40 else
41 file->f_pos = new;
42 mutex_unlock(&inode->i_mutex);
43 return new;
44 }
45
46 static ssize_t
proc_bus_pci_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)47 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
48 {
49 const struct inode *ino = file->f_path.dentry->d_inode;
50 const struct proc_dir_entry *dp = PDE(ino);
51 struct pci_dev *dev = dp->data;
52 unsigned int pos = *ppos;
53 unsigned int cnt, size;
54
55 /*
56 * Normal users can read only the standardized portion of the
57 * configuration space as several chips lock up when trying to read
58 * undefined locations (think of Intel PIIX4 as a typical example).
59 */
60
61 if (capable(CAP_SYS_ADMIN))
62 size = dp->size;
63 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
64 size = 128;
65 else
66 size = 64;
67
68 if (pos >= size)
69 return 0;
70 if (nbytes >= size)
71 nbytes = size;
72 if (pos + nbytes > size)
73 nbytes = size - pos;
74 cnt = nbytes;
75
76 if (!access_ok(VERIFY_WRITE, buf, cnt))
77 return -EINVAL;
78
79 if ((pos & 1) && cnt) {
80 unsigned char val;
81 pci_user_read_config_byte(dev, pos, &val);
82 __put_user(val, buf);
83 buf++;
84 pos++;
85 cnt--;
86 }
87
88 if ((pos & 3) && cnt > 2) {
89 unsigned short val;
90 pci_user_read_config_word(dev, pos, &val);
91 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
92 buf += 2;
93 pos += 2;
94 cnt -= 2;
95 }
96
97 while (cnt >= 4) {
98 unsigned int val;
99 pci_user_read_config_dword(dev, pos, &val);
100 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
101 buf += 4;
102 pos += 4;
103 cnt -= 4;
104 }
105
106 if (cnt >= 2) {
107 unsigned short val;
108 pci_user_read_config_word(dev, pos, &val);
109 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
110 buf += 2;
111 pos += 2;
112 cnt -= 2;
113 }
114
115 if (cnt) {
116 unsigned char val;
117 pci_user_read_config_byte(dev, pos, &val);
118 __put_user(val, buf);
119 buf++;
120 pos++;
121 cnt--;
122 }
123
124 *ppos = pos;
125 return nbytes;
126 }
127
128 static ssize_t
proc_bus_pci_write(struct file * file,const char __user * buf,size_t nbytes,loff_t * ppos)129 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
130 {
131 struct inode *ino = file->f_path.dentry->d_inode;
132 const struct proc_dir_entry *dp = PDE(ino);
133 struct pci_dev *dev = dp->data;
134 int pos = *ppos;
135 int size = dp->size;
136 int cnt;
137
138 if (pos >= size)
139 return 0;
140 if (nbytes >= size)
141 nbytes = size;
142 if (pos + nbytes > size)
143 nbytes = size - pos;
144 cnt = nbytes;
145
146 if (!access_ok(VERIFY_READ, buf, cnt))
147 return -EINVAL;
148
149 if ((pos & 1) && cnt) {
150 unsigned char val;
151 __get_user(val, buf);
152 pci_user_write_config_byte(dev, pos, val);
153 buf++;
154 pos++;
155 cnt--;
156 }
157
158 if ((pos & 3) && cnt > 2) {
159 __le16 val;
160 __get_user(val, (__le16 __user *) buf);
161 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
162 buf += 2;
163 pos += 2;
164 cnt -= 2;
165 }
166
167 while (cnt >= 4) {
168 __le32 val;
169 __get_user(val, (__le32 __user *) buf);
170 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
171 buf += 4;
172 pos += 4;
173 cnt -= 4;
174 }
175
176 if (cnt >= 2) {
177 __le16 val;
178 __get_user(val, (__le16 __user *) buf);
179 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
180 buf += 2;
181 pos += 2;
182 cnt -= 2;
183 }
184
185 if (cnt) {
186 unsigned char val;
187 __get_user(val, buf);
188 pci_user_write_config_byte(dev, pos, val);
189 buf++;
190 pos++;
191 cnt--;
192 }
193
194 *ppos = pos;
195 i_size_write(ino, dp->size);
196 return nbytes;
197 }
198
199 struct pci_filp_private {
200 enum pci_mmap_state mmap_state;
201 int write_combine;
202 };
203
proc_bus_pci_ioctl(struct file * file,unsigned int cmd,unsigned long arg)204 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
205 unsigned long arg)
206 {
207 const struct proc_dir_entry *dp = PDE(file->f_dentry->d_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
proc_bus_pci_mmap(struct file * file,struct vm_area_struct * vma)246 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
247 {
248 struct inode *inode = file->f_path.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 i, ret;
253
254 if (!capable(CAP_SYS_RAWIO))
255 return -EPERM;
256
257 /* Make sure the caller is mapping a real resource for this device */
258 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
259 if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
260 break;
261 }
262
263 if (i >= PCI_ROM_RESOURCE)
264 return -ENODEV;
265
266 ret = pci_mmap_page_range(dev, vma,
267 fpriv->mmap_state,
268 fpriv->write_combine);
269 if (ret < 0)
270 return ret;
271
272 return 0;
273 }
274
proc_bus_pci_open(struct inode * inode,struct file * file)275 static int proc_bus_pci_open(struct inode *inode, struct file *file)
276 {
277 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
278
279 if (!fpriv)
280 return -ENOMEM;
281
282 fpriv->mmap_state = pci_mmap_io;
283 fpriv->write_combine = 0;
284
285 file->private_data = fpriv;
286
287 return 0;
288 }
289
proc_bus_pci_release(struct inode * inode,struct file * file)290 static int proc_bus_pci_release(struct inode *inode, struct file *file)
291 {
292 kfree(file->private_data);
293 file->private_data = NULL;
294
295 return 0;
296 }
297 #endif /* HAVE_PCI_MMAP */
298
299 static const struct file_operations proc_bus_pci_operations = {
300 .owner = THIS_MODULE,
301 .llseek = proc_bus_pci_lseek,
302 .read = proc_bus_pci_read,
303 .write = proc_bus_pci_write,
304 .unlocked_ioctl = proc_bus_pci_ioctl,
305 .compat_ioctl = proc_bus_pci_ioctl,
306 #ifdef HAVE_PCI_MMAP
307 .open = proc_bus_pci_open,
308 .release = proc_bus_pci_release,
309 .mmap = proc_bus_pci_mmap,
310 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
311 .get_unmapped_area = get_pci_unmapped_area,
312 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
313 #endif /* HAVE_PCI_MMAP */
314 };
315
316 /* iterator */
pci_seq_start(struct seq_file * m,loff_t * pos)317 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
318 {
319 struct pci_dev *dev = NULL;
320 loff_t n = *pos;
321
322 for_each_pci_dev(dev) {
323 if (!n--)
324 break;
325 }
326 return dev;
327 }
328
pci_seq_next(struct seq_file * m,void * v,loff_t * pos)329 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
330 {
331 struct pci_dev *dev = v;
332
333 (*pos)++;
334 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
335 return dev;
336 }
337
pci_seq_stop(struct seq_file * m,void * v)338 static void pci_seq_stop(struct seq_file *m, void *v)
339 {
340 if (v) {
341 struct pci_dev *dev = v;
342 pci_dev_put(dev);
343 }
344 }
345
show_device(struct seq_file * m,void * v)346 static int show_device(struct seq_file *m, void *v)
347 {
348 const struct pci_dev *dev = v;
349 const struct pci_driver *drv;
350 int i;
351
352 if (dev == NULL)
353 return 0;
354
355 drv = pci_dev_driver(dev);
356 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
357 dev->bus->number,
358 dev->devfn,
359 dev->vendor,
360 dev->device,
361 dev->irq);
362
363 /* only print standard and ROM resources to preserve compatibility */
364 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
365 resource_size_t start, end;
366 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
367 seq_printf(m, "\t%16llx",
368 (unsigned long long)(start |
369 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
370 }
371 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
372 resource_size_t start, end;
373 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
374 seq_printf(m, "\t%16llx",
375 dev->resource[i].start < dev->resource[i].end ?
376 (unsigned long long)(end - start) + 1 : 0);
377 }
378 seq_putc(m, '\t');
379 if (drv)
380 seq_printf(m, "%s", drv->name);
381 seq_putc(m, '\n');
382 return 0;
383 }
384
385 static const struct seq_operations proc_bus_pci_devices_op = {
386 .start = pci_seq_start,
387 .next = pci_seq_next,
388 .stop = pci_seq_stop,
389 .show = show_device
390 };
391
392 static struct proc_dir_entry *proc_bus_pci_dir;
393
pci_proc_attach_device(struct pci_dev * dev)394 int pci_proc_attach_device(struct pci_dev *dev)
395 {
396 struct pci_bus *bus = dev->bus;
397 struct proc_dir_entry *e;
398 char name[16];
399
400 if (!proc_initialized)
401 return -EACCES;
402
403 if (!bus->procdir) {
404 if (pci_proc_domain(bus)) {
405 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
406 bus->number);
407 } else {
408 sprintf(name, "%02x", bus->number);
409 }
410 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
411 if (!bus->procdir)
412 return -ENOMEM;
413 }
414
415 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
416 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
417 &proc_bus_pci_operations, dev);
418 if (!e)
419 return -ENOMEM;
420 e->size = dev->cfg_size;
421 dev->procent = e;
422
423 return 0;
424 }
425
pci_proc_detach_device(struct pci_dev * dev)426 int pci_proc_detach_device(struct pci_dev *dev)
427 {
428 struct proc_dir_entry *e;
429
430 if ((e = dev->procent)) {
431 remove_proc_entry(e->name, dev->bus->procdir);
432 dev->procent = NULL;
433 }
434 return 0;
435 }
436
437 #if 0
438 int pci_proc_attach_bus(struct pci_bus* bus)
439 {
440 struct proc_dir_entry *de = bus->procdir;
441
442 if (!proc_initialized)
443 return -EACCES;
444
445 if (!de) {
446 char name[16];
447 sprintf(name, "%02x", bus->number);
448 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
449 if (!de)
450 return -ENOMEM;
451 }
452 return 0;
453 }
454 #endif /* 0 */
455
pci_proc_detach_bus(struct pci_bus * bus)456 int pci_proc_detach_bus(struct pci_bus* bus)
457 {
458 struct proc_dir_entry *de = bus->procdir;
459 if (de)
460 remove_proc_entry(de->name, proc_bus_pci_dir);
461 return 0;
462 }
463
proc_bus_pci_dev_open(struct inode * inode,struct file * file)464 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
465 {
466 return seq_open(file, &proc_bus_pci_devices_op);
467 }
468 static const struct file_operations proc_bus_pci_dev_operations = {
469 .owner = THIS_MODULE,
470 .open = proc_bus_pci_dev_open,
471 .read = seq_read,
472 .llseek = seq_lseek,
473 .release = seq_release,
474 };
475
pci_proc_init(void)476 static int __init pci_proc_init(void)
477 {
478 struct pci_dev *dev = NULL;
479 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
480 proc_create("devices", 0, proc_bus_pci_dir,
481 &proc_bus_pci_dev_operations);
482 proc_initialized = 1;
483 for_each_pci_dev(dev)
484 pci_proc_attach_device(dev);
485
486 return 0;
487 }
488
489 device_initcall(pci_proc_init);
490
491