2 * Procfs interface for the PCI bus.
4 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
7 #include <linux/init.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>
18 static int proc_initialized; /* = 0 */
21 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
24 struct inode *inode = file->f_path.dentry->d_inode;
26 mutex_lock(&inode->i_mutex);
32 new = file->f_pos + off;
35 new = inode->i_size + off;
38 if (new < 0 || new > inode->i_size)
42 mutex_unlock(&inode->i_mutex);
47 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
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;
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).
61 if (capable(CAP_SYS_ADMIN))
63 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
72 if (pos + nbytes > size)
76 if (!access_ok(VERIFY_WRITE, buf, cnt))
79 if ((pos & 1) && cnt) {
81 pci_user_read_config_byte(dev, pos, &val);
88 if ((pos & 3) && cnt > 2) {
90 pci_user_read_config_word(dev, pos, &val);
91 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
99 pci_user_read_config_dword(dev, pos, &val);
100 __put_user(cpu_to_le32(val), (__le32 __user *) buf);
108 pci_user_read_config_word(dev, pos, &val);
109 __put_user(cpu_to_le16(val), (__le16 __user *) buf);
117 pci_user_read_config_byte(dev, pos, &val);
118 __put_user(val, buf);
129 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
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;
142 if (pos + nbytes > size)
146 if (!access_ok(VERIFY_READ, buf, cnt))
149 if ((pos & 1) && cnt) {
151 __get_user(val, buf);
152 pci_user_write_config_byte(dev, pos, val);
158 if ((pos & 3) && cnt > 2) {
160 __get_user(val, (__le16 __user *) buf);
161 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
169 __get_user(val, (__le32 __user *) buf);
170 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
178 __get_user(val, (__le16 __user *) buf);
179 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
187 __get_user(val, buf);
188 pci_user_write_config_byte(dev, pos, val);
195 i_size_write(ino, dp->size);
199 struct pci_filp_private {
200 enum pci_mmap_state mmap_state;
204 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
207 const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
208 struct pci_dev *dev = dp->data;
210 struct pci_filp_private *fpriv = file->private_data;
211 #endif /* HAVE_PCI_MMAP */
215 case PCIIOC_CONTROLLER:
216 ret = pci_domain_nr(dev->bus);
220 case PCIIOC_MMAP_IS_IO:
221 fpriv->mmap_state = pci_mmap_io;
224 case PCIIOC_MMAP_IS_MEM:
225 fpriv->mmap_state = pci_mmap_mem;
228 case PCIIOC_WRITE_COMBINE:
230 fpriv->write_combine = 1;
232 fpriv->write_combine = 0;
235 #endif /* HAVE_PCI_MMAP */
246 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
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, write_combine = 0, res_bit;
254 if (!capable(CAP_SYS_RAWIO))
257 if (fpriv->mmap_state == pci_mmap_io)
258 res_bit = IORESOURCE_IO;
260 res_bit = IORESOURCE_MEM;
262 /* Make sure the caller is mapping a real resource for this device */
263 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
264 if (dev->resource[i].flags & res_bit &&
265 pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
269 if (i >= PCI_ROM_RESOURCE)
272 if (fpriv->mmap_state == pci_mmap_mem &&
273 fpriv->write_combine) {
274 if (dev->resource[i].flags & IORESOURCE_PREFETCH)
279 ret = pci_mmap_page_range(dev, vma,
280 fpriv->mmap_state, write_combine);
287 static int proc_bus_pci_open(struct inode *inode, struct file *file)
289 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
294 fpriv->mmap_state = pci_mmap_io;
295 fpriv->write_combine = 0;
297 file->private_data = fpriv;
302 static int proc_bus_pci_release(struct inode *inode, struct file *file)
304 kfree(file->private_data);
305 file->private_data = NULL;
309 #endif /* HAVE_PCI_MMAP */
311 static const struct file_operations proc_bus_pci_operations = {
312 .owner = THIS_MODULE,
313 .llseek = proc_bus_pci_lseek,
314 .read = proc_bus_pci_read,
315 .write = proc_bus_pci_write,
316 .unlocked_ioctl = proc_bus_pci_ioctl,
317 .compat_ioctl = proc_bus_pci_ioctl,
319 .open = proc_bus_pci_open,
320 .release = proc_bus_pci_release,
321 .mmap = proc_bus_pci_mmap,
322 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
323 .get_unmapped_area = get_pci_unmapped_area,
324 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
325 #endif /* HAVE_PCI_MMAP */
329 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
331 struct pci_dev *dev = NULL;
334 for_each_pci_dev(dev) {
341 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
343 struct pci_dev *dev = v;
346 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
350 static void pci_seq_stop(struct seq_file *m, void *v)
353 struct pci_dev *dev = v;
358 static int show_device(struct seq_file *m, void *v)
360 const struct pci_dev *dev = v;
361 const struct pci_driver *drv;
367 drv = pci_dev_driver(dev);
368 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
375 /* only print standard and ROM resources to preserve compatibility */
376 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
377 resource_size_t start, end;
378 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
379 seq_printf(m, "\t%16llx",
380 (unsigned long long)(start |
381 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
383 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
384 resource_size_t start, end;
385 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
386 seq_printf(m, "\t%16llx",
387 dev->resource[i].start < dev->resource[i].end ?
388 (unsigned long long)(end - start) + 1 : 0);
392 seq_printf(m, "%s", drv->name);
397 static const struct seq_operations proc_bus_pci_devices_op = {
398 .start = pci_seq_start,
399 .next = pci_seq_next,
400 .stop = pci_seq_stop,
404 static struct proc_dir_entry *proc_bus_pci_dir;
406 int pci_proc_attach_device(struct pci_dev *dev)
408 struct pci_bus *bus = dev->bus;
409 struct proc_dir_entry *e;
412 if (!proc_initialized)
416 if (pci_proc_domain(bus)) {
417 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
420 sprintf(name, "%02x", bus->number);
422 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
427 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
428 e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
429 &proc_bus_pci_operations, dev);
432 e->size = dev->cfg_size;
438 int pci_proc_detach_device(struct pci_dev *dev)
440 struct proc_dir_entry *e;
442 if ((e = dev->procent)) {
443 remove_proc_entry(e->name, dev->bus->procdir);
450 int pci_proc_attach_bus(struct pci_bus* bus)
452 struct proc_dir_entry *de = bus->procdir;
454 if (!proc_initialized)
459 sprintf(name, "%02x", bus->number);
460 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
468 int pci_proc_detach_bus(struct pci_bus* bus)
470 struct proc_dir_entry *de = bus->procdir;
472 remove_proc_entry(de->name, proc_bus_pci_dir);
476 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
478 return seq_open(file, &proc_bus_pci_devices_op);
480 static const struct file_operations proc_bus_pci_dev_operations = {
481 .owner = THIS_MODULE,
482 .open = proc_bus_pci_dev_open,
485 .release = seq_release,
488 static int __init pci_proc_init(void)
490 struct pci_dev *dev = NULL;
491 proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
492 proc_create("devices", 0, proc_bus_pci_dir,
493 &proc_bus_pci_dev_operations);
494 proc_initialized = 1;
495 for_each_pci_dev(dev)
496 pci_proc_attach_device(dev);
501 device_initcall(pci_proc_init);