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8#include <linux/init.h>
9#include <linux/pci.h>
10#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/proc_fs.h>
13#include <linux/seq_file.h>
14#include <linux/capability.h>
15#include <linux/uaccess.h>
16#include <linux/security.h>
17#include <asm/byteorder.h>
18#include "pci.h"
19
20static int proc_initialized;
21
22static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
23{
24 struct pci_dev *dev = PDE_DATA(file_inode(file));
25 return fixed_size_llseek(file, off, whence, dev->cfg_size);
26}
27
28static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
29 size_t nbytes, loff_t *ppos)
30{
31 struct pci_dev *dev = PDE_DATA(file_inode(file));
32 unsigned int pos = *ppos;
33 unsigned int cnt, size;
34
35
36
37
38
39
40
41 if (capable(CAP_SYS_ADMIN))
42 size = dev->cfg_size;
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
56 if (!access_ok(buf, cnt))
57 return -EINVAL;
58
59 pci_config_pm_runtime_get(dev);
60
61 if ((pos & 1) && cnt) {
62 unsigned char val;
63 pci_user_read_config_byte(dev, pos, &val);
64 __put_user(val, buf);
65 buf++;
66 pos++;
67 cnt--;
68 }
69
70 if ((pos & 3) && cnt > 2) {
71 unsigned short val;
72 pci_user_read_config_word(dev, pos, &val);
73 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
74 buf += 2;
75 pos += 2;
76 cnt -= 2;
77 }
78
79 while (cnt >= 4) {
80 unsigned int val;
81 pci_user_read_config_dword(dev, pos, &val);
82 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
83 buf += 4;
84 pos += 4;
85 cnt -= 4;
86 cond_resched();
87 }
88
89 if (cnt >= 2) {
90 unsigned short val;
91 pci_user_read_config_word(dev, pos, &val);
92 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
93 buf += 2;
94 pos += 2;
95 cnt -= 2;
96 }
97
98 if (cnt) {
99 unsigned char val;
100 pci_user_read_config_byte(dev, pos, &val);
101 __put_user(val, buf);
102 buf++;
103 pos++;
104 cnt--;
105 }
106
107 pci_config_pm_runtime_put(dev);
108
109 *ppos = pos;
110 return nbytes;
111}
112
113static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
114 size_t nbytes, loff_t *ppos)
115{
116 struct inode *ino = file_inode(file);
117 struct pci_dev *dev = PDE_DATA(ino);
118 int pos = *ppos;
119 int size = dev->cfg_size;
120 int cnt, ret;
121
122 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
123 if (ret)
124 return ret;
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
134 if (!access_ok(buf, cnt))
135 return -EINVAL;
136
137 pci_config_pm_runtime_get(dev);
138
139 if ((pos & 1) && cnt) {
140 unsigned char val;
141 __get_user(val, buf);
142 pci_user_write_config_byte(dev, pos, val);
143 buf++;
144 pos++;
145 cnt--;
146 }
147
148 if ((pos & 3) && cnt > 2) {
149 __le16 val;
150 __get_user(val, (__le16 __user *) buf);
151 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
152 buf += 2;
153 pos += 2;
154 cnt -= 2;
155 }
156
157 while (cnt >= 4) {
158 __le32 val;
159 __get_user(val, (__le32 __user *) buf);
160 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
161 buf += 4;
162 pos += 4;
163 cnt -= 4;
164 }
165
166 if (cnt >= 2) {
167 __le16 val;
168 __get_user(val, (__le16 __user *) buf);
169 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
170 buf += 2;
171 pos += 2;
172 cnt -= 2;
173 }
174
175 if (cnt) {
176 unsigned char val;
177 __get_user(val, buf);
178 pci_user_write_config_byte(dev, pos, val);
179 buf++;
180 pos++;
181 cnt--;
182 }
183
184 pci_config_pm_runtime_put(dev);
185
186 *ppos = pos;
187 i_size_write(ino, dev->cfg_size);
188 return nbytes;
189}
190
191struct pci_filp_private {
192 enum pci_mmap_state mmap_state;
193 int write_combine;
194};
195
196static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
197 unsigned long arg)
198{
199 struct pci_dev *dev = PDE_DATA(file_inode(file));
200#ifdef HAVE_PCI_MMAP
201 struct pci_filp_private *fpriv = file->private_data;
202#endif
203 int ret = 0;
204
205 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
206 if (ret)
207 return ret;
208
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:
216 if (!arch_can_pci_mmap_io())
217 return -EINVAL;
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:
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
234 fallthrough;
235#endif
236 default:
237 ret = -EINVAL;
238 break;
239 }
240
241 return ret;
242}
243
244#ifdef HAVE_PCI_MMAP
245static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
246{
247 struct pci_dev *dev = PDE_DATA(file_inode(file));
248 struct pci_filp_private *fpriv = file->private_data;
249 int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
250
251 if (!capable(CAP_SYS_RAWIO) ||
252 security_locked_down(LOCKDOWN_PCI_ACCESS))
253 return -EPERM;
254
255 if (fpriv->mmap_state == pci_mmap_io) {
256 if (!arch_can_pci_mmap_io())
257 return -EINVAL;
258 res_bit = IORESOURCE_IO;
259 }
260
261
262 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
263 if (dev->resource[i].flags & res_bit &&
264 pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
265 break;
266 }
267
268 if (i >= PCI_STD_NUM_BARS)
269 return -ENODEV;
270
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 }
278
279 if (dev->resource[i].flags & IORESOURCE_MEM &&
280 iomem_is_exclusive(dev->resource[i].start))
281 return -EINVAL;
282
283 ret = pci_mmap_page_range(dev, i, vma,
284 fpriv->mmap_state, write_combine);
285 if (ret < 0)
286 return ret;
287
288 return 0;
289}
290
291static 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;
302 file->f_mapping = iomem_get_mapping();
303
304 return 0;
305}
306
307static 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
315
316static 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
324#ifdef HAVE_PCI_MMAP
325 .proc_open = proc_bus_pci_open,
326 .proc_release = proc_bus_pci_release,
327 .proc_mmap = proc_bus_pci_mmap,
328#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
329 .proc_get_unmapped_area = get_pci_unmapped_area,
330#endif
331#endif
332};
333
334
335static 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
347static 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
356static 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
364static 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);
380
381
382 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
383 resource_size_t start, end;
384 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
385 seq_printf(m, "\t%16llx",
386 (unsigned long long)(start |
387 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
388 }
389 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
390 resource_size_t start, end;
391 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
392 seq_printf(m, "\t%16llx",
393 dev->resource[i].start < dev->resource[i].end ?
394 (unsigned long long)(end - start) + 1 : 0);
395 }
396 seq_putc(m, '\t');
397 if (drv)
398 seq_puts(m, drv->name);
399 seq_putc(m, '\n');
400 return 0;
401}
402
403static const struct seq_operations proc_bus_pci_devices_op = {
404 .start = pci_seq_start,
405 .next = pci_seq_next,
406 .stop = pci_seq_stop,
407 .show = show_device
408};
409
410static struct proc_dir_entry *proc_bus_pci_dir;
411
412int 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));
434 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
435 &proc_bus_pci_ops, dev);
436 if (!e)
437 return -ENOMEM;
438 proc_set_size(e, dev->cfg_size);
439 dev->procent = e;
440
441 return 0;
442}
443
444int pci_proc_detach_device(struct pci_dev *dev)
445{
446 proc_remove(dev->procent);
447 dev->procent = NULL;
448 return 0;
449}
450
451int pci_proc_detach_bus(struct pci_bus *bus)
452{
453 proc_remove(bus->procdir);
454 return 0;
455}
456
457static int __init pci_proc_init(void)
458{
459 struct pci_dev *dev = NULL;
460 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
461 proc_create_seq("devices", 0, proc_bus_pci_dir,
462 &proc_bus_pci_devices_op);
463 proc_initialized = 1;
464 for_each_pci_dev(dev)
465 pci_proc_attach_device(dev);
466
467 return 0;
468}
469device_initcall(pci_proc_init);
470
