2 * $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
4 * Procfs interface for the PCI bus.
6 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
9 #include <linux/init.h>
10 #include <linux/pci.h>
11 #include <linux/module.h>
12 #include <linux/proc_fs.h>
13 #include <linux/seq_file.h>
15 #include <asm/uaccess.h>
16 #include <asm/byteorder.h>
19 static int proc_initialized; /* = 0 */
22 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
25 struct inode *inode = file->f_path.dentry->d_inode;
27 mutex_lock(&inode->i_mutex);
33 new = file->f_pos + off;
36 new = inode->i_size + off;
39 if (new < 0 || new > inode->i_size)
43 mutex_unlock(&inode->i_mutex);
48 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
50 const struct inode *ino = file->f_path.dentry->d_inode;
51 const struct proc_dir_entry *dp = PDE(ino);
52 struct pci_dev *dev = dp->data;
53 unsigned int pos = *ppos;
54 unsigned int cnt, size;
57 * Normal users can read only the standardized portion of the
58 * configuration space as several chips lock up when trying to read
59 * undefined locations (think of Intel PIIX4 as a typical example).
62 if (capable(CAP_SYS_ADMIN))
64 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
73 if (pos + nbytes > size)
77 if (!access_ok(VERIFY_WRITE, buf, cnt))
80 if ((pos & 1) && cnt) {
82 pci_user_read_config_byte(dev, pos, &val);
89 if ((pos & 3) && cnt > 2) {
91 pci_user_read_config_word(dev, pos, &val);
92 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
100 pci_user_read_config_dword(dev, pos, &val);
101 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
109 pci_user_read_config_word(dev, pos, &val);
110 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
118 pci_user_read_config_byte(dev, pos, &val);
119 __put_user(val, buf);
130 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
132 const struct inode *ino = file->f_path.dentry->d_inode;
133 const struct proc_dir_entry *dp = PDE(ino);
134 struct pci_dev *dev = dp->data;
136 int size = dev->cfg_size;
143 if (pos + nbytes > size)
147 if (!access_ok(VERIFY_READ, buf, cnt))
150 if ((pos & 1) && cnt) {
152 __get_user(val, buf);
153 pci_user_write_config_byte(dev, pos, val);
159 if ((pos & 3) && cnt > 2) {
161 __get_user(val, (unsigned short __user *) buf);
162 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
170 __get_user(val, (unsigned int __user *) buf);
171 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
179 __get_user(val, (unsigned short __user *) buf);
180 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
188 __get_user(val, buf);
189 pci_user_write_config_byte(dev, pos, val);
199 struct pci_filp_private {
200 enum pci_mmap_state mmap_state;
204 static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
206 const struct proc_dir_entry *dp = PDE(inode);
207 struct pci_dev *dev = dp->data;
209 struct pci_filp_private *fpriv = file->private_data;
210 #endif /* HAVE_PCI_MMAP */
214 case PCIIOC_CONTROLLER:
215 ret = pci_domain_nr(dev->bus);
219 case PCIIOC_MMAP_IS_IO:
220 fpriv->mmap_state = pci_mmap_io;
223 case PCIIOC_MMAP_IS_MEM:
224 fpriv->mmap_state = pci_mmap_mem;
227 case PCIIOC_WRITE_COMBINE:
229 fpriv->write_combine = 1;
231 fpriv->write_combine = 0;
234 #endif /* HAVE_PCI_MMAP */
245 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
247 struct inode *inode = file->f_path.dentry->d_inode;
248 const struct proc_dir_entry *dp = PDE(inode);
249 struct pci_dev *dev = dp->data;
250 struct pci_filp_private *fpriv = file->private_data;
253 if (!capable(CAP_SYS_RAWIO))
256 ret = pci_mmap_page_range(dev, vma,
258 fpriv->write_combine);
265 static int proc_bus_pci_open(struct inode *inode, struct file *file)
267 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
272 fpriv->mmap_state = pci_mmap_io;
273 fpriv->write_combine = 0;
275 file->private_data = fpriv;
280 static int proc_bus_pci_release(struct inode *inode, struct file *file)
282 kfree(file->private_data);
283 file->private_data = NULL;
287 #endif /* HAVE_PCI_MMAP */
289 static const struct file_operations proc_bus_pci_operations = {
290 .llseek = proc_bus_pci_lseek,
291 .read = proc_bus_pci_read,
292 .write = proc_bus_pci_write,
293 .ioctl = proc_bus_pci_ioctl,
295 .open = proc_bus_pci_open,
296 .release = proc_bus_pci_release,
297 .mmap = proc_bus_pci_mmap,
298 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
299 .get_unmapped_area = get_pci_unmapped_area,
300 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
301 #endif /* HAVE_PCI_MMAP */
305 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
307 struct pci_dev *dev = NULL;
310 for_each_pci_dev(dev) {
317 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
319 struct pci_dev *dev = v;
322 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
326 static void pci_seq_stop(struct seq_file *m, void *v)
329 struct pci_dev *dev = v;
334 static int show_device(struct seq_file *m, void *v)
336 const struct pci_dev *dev = v;
337 const struct pci_driver *drv;
343 drv = pci_dev_driver(dev);
344 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
350 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
351 for (i=0; i<7; i++) {
352 resource_size_t start, end;
353 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
354 seq_printf(m, "\t%16llx",
355 (unsigned long long)(start |
356 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
358 for (i=0; i<7; i++) {
359 resource_size_t start, end;
360 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
361 seq_printf(m, "\t%16llx",
362 dev->resource[i].start < dev->resource[i].end ?
363 (unsigned long long)(end - start) + 1 : 0);
367 seq_printf(m, "%s", drv->name);
372 static struct seq_operations proc_bus_pci_devices_op = {
373 .start = pci_seq_start,
374 .next = pci_seq_next,
375 .stop = pci_seq_stop,
379 static struct proc_dir_entry *proc_bus_pci_dir;
381 int pci_proc_attach_device(struct pci_dev *dev)
383 struct pci_bus *bus = dev->bus;
384 struct proc_dir_entry *e;
387 if (!proc_initialized)
391 if (pci_proc_domain(bus)) {
392 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
395 sprintf(name, "%02x", bus->number);
397 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
402 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
403 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
406 e->proc_fops = &proc_bus_pci_operations;
408 e->size = dev->cfg_size;
414 int pci_proc_detach_device(struct pci_dev *dev)
416 struct proc_dir_entry *e;
418 if ((e = dev->procent)) {
419 if (atomic_read(&e->count))
421 remove_proc_entry(e->name, dev->bus->procdir);
428 int pci_proc_attach_bus(struct pci_bus* bus)
430 struct proc_dir_entry *de = bus->procdir;
432 if (!proc_initialized)
437 sprintf(name, "%02x", bus->number);
438 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
446 int pci_proc_detach_bus(struct pci_bus* bus)
448 struct proc_dir_entry *de = bus->procdir;
450 remove_proc_entry(de->name, proc_bus_pci_dir);
454 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
456 return seq_open(file, &proc_bus_pci_devices_op);
458 static const struct file_operations proc_bus_pci_dev_operations = {
459 .open = proc_bus_pci_dev_open,
462 .release = seq_release,
465 static int __init pci_proc_init(void)
467 struct proc_dir_entry *entry;
468 struct pci_dev *dev = NULL;
469 proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
470 entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
472 entry->proc_fops = &proc_bus_pci_dev_operations;
473 proc_initialized = 1;
474 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
475 pci_proc_attach_device(dev);
480 __initcall(pci_proc_init);
482 #ifdef CONFIG_HOTPLUG
483 EXPORT_SYMBOL(pci_proc_attach_device);
484 EXPORT_SYMBOL(pci_proc_detach_bus);