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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 <asm/byteorder.h>
17#include "pci.h"
18
19static int proc_initialized;
20
21static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
22{
23 struct pci_dev *dev = PDE_DATA(file_inode(file));
24 return fixed_size_llseek(file, off, whence, dev->cfg_size);
25}
26
27static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
28 size_t nbytes, loff_t *ppos)
29{
30 struct pci_dev *dev = PDE_DATA(file_inode(file));
31 unsigned int pos = *ppos;
32 unsigned int cnt, size;
33
34
35
36
37
38
39
40 if (capable(CAP_SYS_ADMIN))
41 size = dev->cfg_size;
42 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(buf, cnt))
56 return -EINVAL;
57
58 pci_config_pm_runtime_get(dev);
59
60 if ((pos & 1) && cnt) {
61 unsigned char val;
62 pci_user_read_config_byte(dev, pos, &val);
63 __put_user(val, buf);
64 buf++;
65 pos++;
66 cnt--;
67 }
68
69 if ((pos & 3) && cnt > 2) {
70 unsigned short val;
71 pci_user_read_config_word(dev, pos, &val);
72 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
73 buf += 2;
74 pos += 2;
75 cnt -= 2;
76 }
77
78 while (cnt >= 4) {
79 unsigned int val;
80 pci_user_read_config_dword(dev, pos, &val);
81 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
82 buf += 4;
83 pos += 4;
84 cnt -= 4;
85 }
86
87 if (cnt >= 2) {
88 unsigned short val;
89 pci_user_read_config_word(dev, pos, &val);
90 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
91 buf += 2;
92 pos += 2;
93 cnt -= 2;
94 }
95
96 if (cnt) {
97 unsigned char val;
98 pci_user_read_config_byte(dev, pos, &val);
99 __put_user(val, buf);
100 buf++;
101 pos++;
102 cnt--;
103 }
104
105 pci_config_pm_runtime_put(dev);
106
107 *ppos = pos;
108 return nbytes;
109}
110
111static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
112 size_t nbytes, loff_t *ppos)
113{
114 struct inode *ino = file_inode(file);
115 struct pci_dev *dev = PDE_DATA(ino);
116 int pos = *ppos;
117 int size = dev->cfg_size;
118 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(buf, cnt))
129 return -EINVAL;
130
131 pci_config_pm_runtime_get(dev);
132
133 if ((pos & 1) && cnt) {
134 unsigned char val;
135 __get_user(val, buf);
136 pci_user_write_config_byte(dev, pos, val);
137 buf++;
138 pos++;
139 cnt--;
140 }
141
142 if ((pos & 3) && cnt > 2) {
143 __le16 val;
144 __get_user(val, (__le16 __user *) buf);
145 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
146 buf += 2;
147 pos += 2;
148 cnt -= 2;
149 }
150
151 while (cnt >= 4) {
152 __le32 val;
153 __get_user(val, (__le32 __user *) buf);
154 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
155 buf += 4;
156 pos += 4;
157 cnt -= 4;
158 }
159
160 if (cnt >= 2) {
161 __le16 val;
162 __get_user(val, (__le16 __user *) buf);
163 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
164 buf += 2;
165 pos += 2;
166 cnt -= 2;
167 }
168
169 if (cnt) {
170 unsigned char val;
171 __get_user(val, buf);
172 pci_user_write_config_byte(dev, pos, val);
173 buf++;
174 pos++;
175 cnt--;
176 }
177
178 pci_config_pm_runtime_put(dev);
179
180 *ppos = pos;
181 i_size_write(ino, dev->cfg_size);
182 return nbytes;
183}
184
185struct pci_filp_private {
186 enum pci_mmap_state mmap_state;
187 int write_combine;
188};
189
190static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
191 unsigned long arg)
192{
193 struct pci_dev *dev = PDE_DATA(file_inode(file));
194#ifdef HAVE_PCI_MMAP
195 struct pci_filp_private *fpriv = file->private_data;
196#endif
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 if (!arch_can_pci_mmap_io())
207 return -EINVAL;
208 fpriv->mmap_state = pci_mmap_io;
209 break;
210
211 case PCIIOC_MMAP_IS_MEM:
212 fpriv->mmap_state = pci_mmap_mem;
213 break;
214
215 case PCIIOC_WRITE_COMBINE:
216 if (arch_can_pci_mmap_wc()) {
217 if (arg)
218 fpriv->write_combine = 1;
219 else
220 fpriv->write_combine = 0;
221 break;
222 }
223
224#endif
225
226 default:
227 ret = -EINVAL;
228 break;
229 }
230
231 return ret;
232}
233
234#ifdef HAVE_PCI_MMAP
235static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
236{
237 struct pci_dev *dev = PDE_DATA(file_inode(file));
238 struct pci_filp_private *fpriv = file->private_data;
239 int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
240
241 if (!capable(CAP_SYS_RAWIO))
242 return -EPERM;
243
244 if (fpriv->mmap_state == pci_mmap_io) {
245 if (!arch_can_pci_mmap_io())
246 return -EINVAL;
247 res_bit = IORESOURCE_IO;
248 }
249
250
251 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
252 if (dev->resource[i].flags & res_bit &&
253 pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
254 break;
255 }
256
257 if (i >= PCI_ROM_RESOURCE)
258 return -ENODEV;
259
260 if (fpriv->mmap_state == pci_mmap_mem &&
261 fpriv->write_combine) {
262 if (dev->resource[i].flags & IORESOURCE_PREFETCH)
263 write_combine = 1;
264 else
265 return -EINVAL;
266 }
267 ret = pci_mmap_page_range(dev, i, vma,
268 fpriv->mmap_state, write_combine);
269 if (ret < 0)
270 return ret;
271
272 return 0;
273}
274
275static 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
290static 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
298
299static 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
313#endif
314};
315
316
317static 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
329static 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
338static 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
346static 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
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_puts(m, drv->name);
381 seq_putc(m, '\n');
382 return 0;
383}
384
385static 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
392static struct proc_dir_entry *proc_bus_pci_dir;
393
394int 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 proc_set_size(e, dev->cfg_size);
421 dev->procent = e;
422
423 return 0;
424}
425
426int pci_proc_detach_device(struct pci_dev *dev)
427{
428 proc_remove(dev->procent);
429 dev->procent = NULL;
430 return 0;
431}
432
433int pci_proc_detach_bus(struct pci_bus *bus)
434{
435 proc_remove(bus->procdir);
436 return 0;
437}
438
439static int __init pci_proc_init(void)
440{
441 struct pci_dev *dev = NULL;
442 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
443 proc_create_seq("devices", 0, proc_bus_pci_dir,
444 &proc_bus_pci_devices_op);
445 proc_initialized = 1;
446 for_each_pci_dev(dev)
447 pci_proc_attach_device(dev);
448
449 return 0;
450}
451device_initcall(pci_proc_init);
452
