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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 }
87
88 if (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 if (cnt) {
98 unsigned char val;
99 pci_user_read_config_byte(dev, pos, &val);
100 __put_user(val, buf);
101 buf++;
102 pos++;
103 cnt--;
104 }
105
106 pci_config_pm_runtime_put(dev);
107
108 *ppos = pos;
109 return nbytes;
110}
111
112static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
113 size_t nbytes, loff_t *ppos)
114{
115 struct inode *ino = file_inode(file);
116 struct pci_dev *dev = PDE_DATA(ino);
117 int pos = *ppos;
118 int size = dev->cfg_size;
119 int cnt, ret;
120
121 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
122 if (ret)
123 return ret;
124
125 if (pos >= size)
126 return 0;
127 if (nbytes >= size)
128 nbytes = size;
129 if (pos + nbytes > size)
130 nbytes = size - pos;
131 cnt = nbytes;
132
133 if (!access_ok(buf, cnt))
134 return -EINVAL;
135
136 pci_config_pm_runtime_get(dev);
137
138 if ((pos & 1) && cnt) {
139 unsigned char val;
140 __get_user(val, buf);
141 pci_user_write_config_byte(dev, pos, val);
142 buf++;
143 pos++;
144 cnt--;
145 }
146
147 if ((pos & 3) && cnt > 2) {
148 __le16 val;
149 __get_user(val, (__le16 __user *) buf);
150 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
151 buf += 2;
152 pos += 2;
153 cnt -= 2;
154 }
155
156 while (cnt >= 4) {
157 __le32 val;
158 __get_user(val, (__le32 __user *) buf);
159 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
160 buf += 4;
161 pos += 4;
162 cnt -= 4;
163 }
164
165 if (cnt >= 2) {
166 __le16 val;
167 __get_user(val, (__le16 __user *) buf);
168 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
169 buf += 2;
170 pos += 2;
171 cnt -= 2;
172 }
173
174 if (cnt) {
175 unsigned char val;
176 __get_user(val, buf);
177 pci_user_write_config_byte(dev, pos, val);
178 buf++;
179 pos++;
180 cnt--;
181 }
182
183 pci_config_pm_runtime_put(dev);
184
185 *ppos = pos;
186 i_size_write(ino, dev->cfg_size);
187 return nbytes;
188}
189
190struct pci_filp_private {
191 enum pci_mmap_state mmap_state;
192 int write_combine;
193};
194
195static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
196 unsigned long arg)
197{
198 struct pci_dev *dev = PDE_DATA(file_inode(file));
199#ifdef HAVE_PCI_MMAP
200 struct pci_filp_private *fpriv = file->private_data;
201#endif
202 int ret = 0;
203
204 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
205 if (ret)
206 return ret;
207
208 switch (cmd) {
209 case PCIIOC_CONTROLLER:
210 ret = pci_domain_nr(dev->bus);
211 break;
212
213#ifdef HAVE_PCI_MMAP
214 case PCIIOC_MMAP_IS_IO:
215 if (!arch_can_pci_mmap_io())
216 return -EINVAL;
217 fpriv->mmap_state = pci_mmap_io;
218 break;
219
220 case PCIIOC_MMAP_IS_MEM:
221 fpriv->mmap_state = pci_mmap_mem;
222 break;
223
224 case PCIIOC_WRITE_COMBINE:
225 if (arch_can_pci_mmap_wc()) {
226 if (arg)
227 fpriv->write_combine = 1;
228 else
229 fpriv->write_combine = 0;
230 break;
231 }
232
233 fallthrough;
234#endif
235 default:
236 ret = -EINVAL;
237 break;
238 }
239
240 return ret;
241}
242
243#ifdef HAVE_PCI_MMAP
244static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
245{
246 struct pci_dev *dev = PDE_DATA(file_inode(file));
247 struct pci_filp_private *fpriv = file->private_data;
248 int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
249
250 if (!capable(CAP_SYS_RAWIO) ||
251 security_locked_down(LOCKDOWN_PCI_ACCESS))
252 return -EPERM;
253
254 if (fpriv->mmap_state == pci_mmap_io) {
255 if (!arch_can_pci_mmap_io())
256 return -EINVAL;
257 res_bit = IORESOURCE_IO;
258 }
259
260
261 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
262 if (dev->resource[i].flags & res_bit &&
263 pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
264 break;
265 }
266
267 if (i >= PCI_STD_NUM_BARS)
268 return -ENODEV;
269
270 if (fpriv->mmap_state == pci_mmap_mem &&
271 fpriv->write_combine) {
272 if (dev->resource[i].flags & IORESOURCE_PREFETCH)
273 write_combine = 1;
274 else
275 return -EINVAL;
276 }
277
278 if (dev->resource[i].flags & IORESOURCE_MEM &&
279 iomem_is_exclusive(dev->resource[i].start))
280 return -EINVAL;
281
282 ret = pci_mmap_page_range(dev, i, vma,
283 fpriv->mmap_state, write_combine);
284 if (ret < 0)
285 return ret;
286
287 return 0;
288}
289
290static int proc_bus_pci_open(struct inode *inode, struct file *file)
291{
292 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
293
294 if (!fpriv)
295 return -ENOMEM;
296
297 fpriv->mmap_state = pci_mmap_io;
298 fpriv->write_combine = 0;
299
300 file->private_data = fpriv;
301 file->f_mapping = iomem_get_mapping();
302
303 return 0;
304}
305
306static int proc_bus_pci_release(struct inode *inode, struct file *file)
307{
308 kfree(file->private_data);
309 file->private_data = NULL;
310
311 return 0;
312}
313#endif
314
315static const struct proc_ops proc_bus_pci_ops = {
316 .proc_lseek = proc_bus_pci_lseek,
317 .proc_read = proc_bus_pci_read,
318 .proc_write = proc_bus_pci_write,
319 .proc_ioctl = proc_bus_pci_ioctl,
320#ifdef CONFIG_COMPAT
321 .proc_compat_ioctl = proc_bus_pci_ioctl,
322#endif
323#ifdef HAVE_PCI_MMAP
324 .proc_open = proc_bus_pci_open,
325 .proc_release = proc_bus_pci_release,
326 .proc_mmap = proc_bus_pci_mmap,
327#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
328 .proc_get_unmapped_area = get_pci_unmapped_area,
329#endif
330#endif
331};
332
333
334static void *pci_seq_start(struct seq_file *m, loff_t *pos)
335{
336 struct pci_dev *dev = NULL;
337 loff_t n = *pos;
338
339 for_each_pci_dev(dev) {
340 if (!n--)
341 break;
342 }
343 return dev;
344}
345
346static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
347{
348 struct pci_dev *dev = v;
349
350 (*pos)++;
351 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
352 return dev;
353}
354
355static void pci_seq_stop(struct seq_file *m, void *v)
356{
357 if (v) {
358 struct pci_dev *dev = v;
359 pci_dev_put(dev);
360 }
361}
362
363static int show_device(struct seq_file *m, void *v)
364{
365 const struct pci_dev *dev = v;
366 const struct pci_driver *drv;
367 int i;
368
369 if (dev == NULL)
370 return 0;
371
372 drv = pci_dev_driver(dev);
373 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
374 dev->bus->number,
375 dev->devfn,
376 dev->vendor,
377 dev->device,
378 dev->irq);
379
380
381 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
382 resource_size_t start, end;
383 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
384 seq_printf(m, "\t%16llx",
385 (unsigned long long)(start |
386 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
387 }
388 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
389 resource_size_t start, end;
390 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
391 seq_printf(m, "\t%16llx",
392 dev->resource[i].start < dev->resource[i].end ?
393 (unsigned long long)(end - start) + 1 : 0);
394 }
395 seq_putc(m, '\t');
396 if (drv)
397 seq_puts(m, drv->name);
398 seq_putc(m, '\n');
399 return 0;
400}
401
402static const struct seq_operations proc_bus_pci_devices_op = {
403 .start = pci_seq_start,
404 .next = pci_seq_next,
405 .stop = pci_seq_stop,
406 .show = show_device
407};
408
409static struct proc_dir_entry *proc_bus_pci_dir;
410
411int pci_proc_attach_device(struct pci_dev *dev)
412{
413 struct pci_bus *bus = dev->bus;
414 struct proc_dir_entry *e;
415 char name[16];
416
417 if (!proc_initialized)
418 return -EACCES;
419
420 if (!bus->procdir) {
421 if (pci_proc_domain(bus)) {
422 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
423 bus->number);
424 } else {
425 sprintf(name, "%02x", bus->number);
426 }
427 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
428 if (!bus->procdir)
429 return -ENOMEM;
430 }
431
432 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
433 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
434 &proc_bus_pci_ops, dev);
435 if (!e)
436 return -ENOMEM;
437 proc_set_size(e, dev->cfg_size);
438 dev->procent = e;
439
440 return 0;
441}
442
443int pci_proc_detach_device(struct pci_dev *dev)
444{
445 proc_remove(dev->procent);
446 dev->procent = NULL;
447 return 0;
448}
449
450int pci_proc_detach_bus(struct pci_bus *bus)
451{
452 proc_remove(bus->procdir);
453 return 0;
454}
455
456static int __init pci_proc_init(void)
457{
458 struct pci_dev *dev = NULL;
459 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
460 proc_create_seq("devices", 0, proc_bus_pci_dir,
461 &proc_bus_pci_devices_op);
462 proc_initialized = 1;
463 for_each_pci_dev(dev)
464 pci_proc_attach_device(dev);
465
466 return 0;
467}
468device_initcall(pci_proc_init);
469
