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Linux/drivers/pci/proc.c

  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 <linux/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 {
 22         struct pci_dev *dev = PDE_DATA(file_inode(file));
 23         return fixed_size_llseek(file, off, whence, dev->cfg_size);
 24 }
 25 
 26 static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
 27                                  size_t nbytes, loff_t *ppos)
 28 {
 29         struct pci_dev *dev = PDE_DATA(file_inode(file));
 30         unsigned int pos = *ppos;
 31         unsigned int cnt, size;
 32 
 33         /*
 34          * Normal users can read only the standardized portion of the
 35          * configuration space as several chips lock up when trying to read
 36          * undefined locations (think of Intel PIIX4 as a typical example).
 37          */
 38 
 39         if (capable(CAP_SYS_ADMIN))
 40                 size = dev->cfg_size;
 41         else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 42                 size = 128;
 43         else
 44                 size = 64;
 45 
 46         if (pos >= size)
 47                 return 0;
 48         if (nbytes >= size)
 49                 nbytes = size;
 50         if (pos + nbytes > size)
 51                 nbytes = size - pos;
 52         cnt = nbytes;
 53 
 54         if (!access_ok(VERIFY_WRITE, buf, cnt))
 55                 return -EINVAL;
 56 
 57         pci_config_pm_runtime_get(dev);
 58 
 59         if ((pos & 1) && cnt) {
 60                 unsigned char val;
 61                 pci_user_read_config_byte(dev, pos, &val);
 62                 __put_user(val, buf);
 63                 buf++;
 64                 pos++;
 65                 cnt--;
 66         }
 67 
 68         if ((pos & 3) && cnt > 2) {
 69                 unsigned short val;
 70                 pci_user_read_config_word(dev, pos, &val);
 71                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
 72                 buf += 2;
 73                 pos += 2;
 74                 cnt -= 2;
 75         }
 76 
 77         while (cnt >= 4) {
 78                 unsigned int val;
 79                 pci_user_read_config_dword(dev, pos, &val);
 80                 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
 81                 buf += 4;
 82                 pos += 4;
 83                 cnt -= 4;
 84         }
 85 
 86         if (cnt >= 2) {
 87                 unsigned short val;
 88                 pci_user_read_config_word(dev, pos, &val);
 89                 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
 90                 buf += 2;
 91                 pos += 2;
 92                 cnt -= 2;
 93         }
 94 
 95         if (cnt) {
 96                 unsigned char val;
 97                 pci_user_read_config_byte(dev, pos, &val);
 98                 __put_user(val, buf);
 99                 buf++;
100                 pos++;
101                 cnt--;
102         }
103 
104         pci_config_pm_runtime_put(dev);
105 
106         *ppos = pos;
107         return nbytes;
108 }
109 
110 static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
111                                   size_t nbytes, loff_t *ppos)
112 {
113         struct inode *ino = file_inode(file);
114         struct pci_dev *dev = PDE_DATA(ino);
115         int pos = *ppos;
116         int size = dev->cfg_size;
117         int cnt;
118 
119         if (pos >= size)
120                 return 0;
121         if (nbytes >= size)
122                 nbytes = size;
123         if (pos + nbytes > size)
124                 nbytes = size - pos;
125         cnt = nbytes;
126 
127         if (!access_ok(VERIFY_READ, buf, cnt))
128                 return -EINVAL;
129 
130         pci_config_pm_runtime_get(dev);
131 
132         if ((pos & 1) && cnt) {
133                 unsigned char val;
134                 __get_user(val, buf);
135                 pci_user_write_config_byte(dev, pos, val);
136                 buf++;
137                 pos++;
138                 cnt--;
139         }
140 
141         if ((pos & 3) && cnt > 2) {
142                 __le16 val;
143                 __get_user(val, (__le16 __user *) buf);
144                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
145                 buf += 2;
146                 pos += 2;
147                 cnt -= 2;
148         }
149 
150         while (cnt >= 4) {
151                 __le32 val;
152                 __get_user(val, (__le32 __user *) buf);
153                 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
154                 buf += 4;
155                 pos += 4;
156                 cnt -= 4;
157         }
158 
159         if (cnt >= 2) {
160                 __le16 val;
161                 __get_user(val, (__le16 __user *) buf);
162                 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
163                 buf += 2;
164                 pos += 2;
165                 cnt -= 2;
166         }
167 
168         if (cnt) {
169                 unsigned char val;
170                 __get_user(val, buf);
171                 pci_user_write_config_byte(dev, pos, val);
172                 buf++;
173                 pos++;
174                 cnt--;
175         }
176 
177         pci_config_pm_runtime_put(dev);
178 
179         *ppos = pos;
180         i_size_write(ino, dev->cfg_size);
181         return nbytes;
182 }
183 
184 struct pci_filp_private {
185         enum pci_mmap_state mmap_state;
186         int write_combine;
187 };
188 
189 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
190                                unsigned long arg)
191 {
192         struct pci_dev *dev = PDE_DATA(file_inode(file));
193 #ifdef HAVE_PCI_MMAP
194         struct pci_filp_private *fpriv = file->private_data;
195 #endif /* HAVE_PCI_MMAP */
196         int ret = 0;
197 
198         switch (cmd) {
199         case PCIIOC_CONTROLLER:
200                 ret = pci_domain_nr(dev->bus);
201                 break;
202 
203 #ifdef HAVE_PCI_MMAP
204         case PCIIOC_MMAP_IS_IO:
205                 fpriv->mmap_state = pci_mmap_io;
206                 break;
207 
208         case PCIIOC_MMAP_IS_MEM:
209                 fpriv->mmap_state = pci_mmap_mem;
210                 break;
211 
212         case PCIIOC_WRITE_COMBINE:
213                 if (arg)
214                         fpriv->write_combine = 1;
215                 else
216                         fpriv->write_combine = 0;
217                 break;
218 
219 #endif /* HAVE_PCI_MMAP */
220 
221         default:
222                 ret = -EINVAL;
223                 break;
224         }
225 
226         return ret;
227 }
228 
229 #ifdef HAVE_PCI_MMAP
230 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
231 {
232         struct pci_dev *dev = PDE_DATA(file_inode(file));
233         struct pci_filp_private *fpriv = file->private_data;
234         int i, ret, write_combine;
235 
236         if (!capable(CAP_SYS_RAWIO))
237                 return -EPERM;
238 
239         /* Make sure the caller is mapping a real resource for this device */
240         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
241                 if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
242                         break;
243         }
244 
245         if (i >= PCI_ROM_RESOURCE)
246                 return -ENODEV;
247 
248         if (fpriv->mmap_state == pci_mmap_mem)
249                 write_combine = fpriv->write_combine;
250         else
251                 write_combine = 0;
252         ret = pci_mmap_page_range(dev, vma,
253                                   fpriv->mmap_state, write_combine);
254         if (ret < 0)
255                 return ret;
256 
257         return 0;
258 }
259 
260 static int proc_bus_pci_open(struct inode *inode, struct file *file)
261 {
262         struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
263 
264         if (!fpriv)
265                 return -ENOMEM;
266 
267         fpriv->mmap_state = pci_mmap_io;
268         fpriv->write_combine = 0;
269 
270         file->private_data = fpriv;
271 
272         return 0;
273 }
274 
275 static int proc_bus_pci_release(struct inode *inode, struct file *file)
276 {
277         kfree(file->private_data);
278         file->private_data = NULL;
279 
280         return 0;
281 }
282 #endif /* HAVE_PCI_MMAP */
283 
284 static const struct file_operations proc_bus_pci_operations = {
285         .owner          = THIS_MODULE,
286         .llseek         = proc_bus_pci_lseek,
287         .read           = proc_bus_pci_read,
288         .write          = proc_bus_pci_write,
289         .unlocked_ioctl = proc_bus_pci_ioctl,
290         .compat_ioctl   = proc_bus_pci_ioctl,
291 #ifdef HAVE_PCI_MMAP
292         .open           = proc_bus_pci_open,
293         .release        = proc_bus_pci_release,
294         .mmap           = proc_bus_pci_mmap,
295 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
296         .get_unmapped_area = get_pci_unmapped_area,
297 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
298 #endif /* HAVE_PCI_MMAP */
299 };
300 
301 /* iterator */
302 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
303 {
304         struct pci_dev *dev = NULL;
305         loff_t n = *pos;
306 
307         for_each_pci_dev(dev) {
308                 if (!n--)
309                         break;
310         }
311         return dev;
312 }
313 
314 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
315 {
316         struct pci_dev *dev = v;
317 
318         (*pos)++;
319         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
320         return dev;
321 }
322 
323 static void pci_seq_stop(struct seq_file *m, void *v)
324 {
325         if (v) {
326                 struct pci_dev *dev = v;
327                 pci_dev_put(dev);
328         }
329 }
330 
331 static int show_device(struct seq_file *m, void *v)
332 {
333         const struct pci_dev *dev = v;
334         const struct pci_driver *drv;
335         int i;
336 
337         if (dev == NULL)
338                 return 0;
339 
340         drv = pci_dev_driver(dev);
341         seq_printf(m, "%02x%02x\t%04x%04x\t%x",
342                         dev->bus->number,
343                         dev->devfn,
344                         dev->vendor,
345                         dev->device,
346                         dev->irq);
347 
348         /* only print standard and ROM resources to preserve compatibility */
349         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
350                 resource_size_t start, end;
351                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
352                 seq_printf(m, "\t%16llx",
353                         (unsigned long long)(start |
354                         (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
355         }
356         for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
357                 resource_size_t start, end;
358                 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
359                 seq_printf(m, "\t%16llx",
360                         dev->resource[i].start < dev->resource[i].end ?
361                         (unsigned long long)(end - start) + 1 : 0);
362         }
363         seq_putc(m, '\t');
364         if (drv)
365                 seq_printf(m, "%s", drv->name);
366         seq_putc(m, '\n');
367         return 0;
368 }
369 
370 static const struct seq_operations proc_bus_pci_devices_op = {
371         .start  = pci_seq_start,
372         .next   = pci_seq_next,
373         .stop   = pci_seq_stop,
374         .show   = show_device
375 };
376 
377 static struct proc_dir_entry *proc_bus_pci_dir;
378 
379 int pci_proc_attach_device(struct pci_dev *dev)
380 {
381         struct pci_bus *bus = dev->bus;
382         struct proc_dir_entry *e;
383         char name[16];
384 
385         if (!proc_initialized)
386                 return -EACCES;
387 
388         if (!bus->procdir) {
389                 if (pci_proc_domain(bus)) {
390                         sprintf(name, "%04x:%02x", pci_domain_nr(bus),
391                                         bus->number);
392                 } else {
393                         sprintf(name, "%02x", bus->number);
394                 }
395                 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
396                 if (!bus->procdir)
397                         return -ENOMEM;
398         }
399 
400         sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
401         e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
402                              &proc_bus_pci_operations, dev);
403         if (!e)
404                 return -ENOMEM;
405         proc_set_size(e, dev->cfg_size);
406         dev->procent = e;
407 
408         return 0;
409 }
410 
411 int pci_proc_detach_device(struct pci_dev *dev)
412 {
413         proc_remove(dev->procent);
414         dev->procent = NULL;
415         return 0;
416 }
417 
418 int pci_proc_detach_bus(struct pci_bus *bus)
419 {
420         proc_remove(bus->procdir);
421         return 0;
422 }
423 
424 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
425 {
426         return seq_open(file, &proc_bus_pci_devices_op);
427 }
428 
429 static const struct file_operations proc_bus_pci_dev_operations = {
430         .owner          = THIS_MODULE,
431         .open           = proc_bus_pci_dev_open,
432         .read           = seq_read,
433         .llseek         = seq_lseek,
434         .release        = seq_release,
435 };
436 
437 static int __init pci_proc_init(void)
438 {
439         struct pci_dev *dev = NULL;
440         proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
441         proc_create("devices", 0, proc_bus_pci_dir,
442                     &proc_bus_pci_dev_operations);
443         proc_initialized = 1;
444         for_each_pci_dev(dev)
445                 pci_proc_attach_device(dev);
446 
447         return 0;
448 }
449 device_initcall(pci_proc_init);
450 

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