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>
14 #include <linux/smp_lock.h>
15 #include <linux/capability.h>
16 #include <asm/uaccess.h>
17 #include <asm/byteorder.h>
20 static int proc_initialized; /* = 0 */
23 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
26 struct inode *inode = file->f_path.dentry->d_inode;
28 mutex_lock(&inode->i_mutex);
34 new = file->f_pos + off;
37 new = inode->i_size + off;
40 if (new < 0 || new > inode->i_size)
44 mutex_unlock(&inode->i_mutex);
49 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
51 const struct inode *ino = file->f_path.dentry->d_inode;
52 const struct proc_dir_entry *dp = PDE(ino);
53 struct pci_dev *dev = dp->data;
54 unsigned int pos = *ppos;
55 unsigned int cnt, size;
58 * Normal users can read only the standardized portion of the
59 * configuration space as several chips lock up when trying to read
60 * undefined locations (think of Intel PIIX4 as a typical example).
63 if (capable(CAP_SYS_ADMIN))
65 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
74 if (pos + nbytes > size)
78 if (!access_ok(VERIFY_WRITE, buf, cnt))
81 if ((pos & 1) && cnt) {
83 pci_user_read_config_byte(dev, pos, &val);
90 if ((pos & 3) && cnt > 2) {
92 pci_user_read_config_word(dev, pos, &val);
93 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
101 pci_user_read_config_dword(dev, pos, &val);
102 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
110 pci_user_read_config_word(dev, pos, &val);
111 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
119 pci_user_read_config_byte(dev, pos, &val);
120 __put_user(val, buf);
131 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
133 struct inode *ino = file->f_path.dentry->d_inode;
134 const struct proc_dir_entry *dp = PDE(ino);
135 struct pci_dev *dev = dp->data;
144 if (pos + nbytes > size)
148 if (!access_ok(VERIFY_READ, buf, cnt))
151 if ((pos & 1) && cnt) {
153 __get_user(val, buf);
154 pci_user_write_config_byte(dev, pos, val);
160 if ((pos & 3) && cnt > 2) {
162 __get_user(val, (unsigned short __user *) buf);
163 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
171 __get_user(val, (unsigned int __user *) buf);
172 pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
180 __get_user(val, (unsigned short __user *) buf);
181 pci_user_write_config_word(dev, pos, le16_to_cpu(val));
189 __get_user(val, buf);
190 pci_user_write_config_byte(dev, pos, val);
197 i_size_write(ino, dp->size);
201 struct pci_filp_private {
202 enum pci_mmap_state mmap_state;
206 static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
209 const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
210 struct pci_dev *dev = dp->data;
212 struct pci_filp_private *fpriv = file->private_data;
213 #endif /* HAVE_PCI_MMAP */
219 case PCIIOC_CONTROLLER:
220 ret = pci_domain_nr(dev->bus);
224 case PCIIOC_MMAP_IS_IO:
225 fpriv->mmap_state = pci_mmap_io;
228 case PCIIOC_MMAP_IS_MEM:
229 fpriv->mmap_state = pci_mmap_mem;
232 case PCIIOC_WRITE_COMBINE:
234 fpriv->write_combine = 1;
236 fpriv->write_combine = 0;
239 #endif /* HAVE_PCI_MMAP */
251 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
253 struct inode *inode = file->f_path.dentry->d_inode;
254 const struct proc_dir_entry *dp = PDE(inode);
255 struct pci_dev *dev = dp->data;
256 struct pci_filp_private *fpriv = file->private_data;
259 if (!capable(CAP_SYS_RAWIO))
262 ret = pci_mmap_page_range(dev, vma,
264 fpriv->write_combine);
271 static int proc_bus_pci_open(struct inode *inode, struct file *file)
273 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
278 fpriv->mmap_state = pci_mmap_io;
279 fpriv->write_combine = 0;
281 file->private_data = fpriv;
286 static int proc_bus_pci_release(struct inode *inode, struct file *file)
288 kfree(file->private_data);
289 file->private_data = NULL;
293 #endif /* HAVE_PCI_MMAP */
295 static const struct file_operations proc_bus_pci_operations = {
296 .llseek = proc_bus_pci_lseek,
297 .read = proc_bus_pci_read,
298 .write = proc_bus_pci_write,
299 .unlocked_ioctl = proc_bus_pci_ioctl,
301 .open = proc_bus_pci_open,
302 .release = proc_bus_pci_release,
303 .mmap = proc_bus_pci_mmap,
304 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
305 .get_unmapped_area = get_pci_unmapped_area,
306 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
307 #endif /* HAVE_PCI_MMAP */
311 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
313 struct pci_dev *dev = NULL;
316 for_each_pci_dev(dev) {
323 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
325 struct pci_dev *dev = v;
328 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
332 static void pci_seq_stop(struct seq_file *m, void *v)
335 struct pci_dev *dev = v;
340 static int show_device(struct seq_file *m, void *v)
342 const struct pci_dev *dev = v;
343 const struct pci_driver *drv;
349 drv = pci_dev_driver(dev);
350 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
356 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
357 for (i=0; i<7; i++) {
358 resource_size_t start, end;
359 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
360 seq_printf(m, "\t%16llx",
361 (unsigned long long)(start |
362 (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
364 for (i=0; i<7; 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 dev->resource[i].start < dev->resource[i].end ?
369 (unsigned long long)(end - start) + 1 : 0);
373 seq_printf(m, "%s", drv->name);
378 static const struct seq_operations proc_bus_pci_devices_op = {
379 .start = pci_seq_start,
380 .next = pci_seq_next,
381 .stop = pci_seq_stop,
385 static struct proc_dir_entry *proc_bus_pci_dir;
387 int pci_proc_attach_device(struct pci_dev *dev)
389 struct pci_bus *bus = dev->bus;
390 struct proc_dir_entry *e;
393 if (!proc_initialized)
397 if (pci_proc_domain(bus)) {
398 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
401 sprintf(name, "%02x", bus->number);
403 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
408 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
409 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
412 e->proc_fops = &proc_bus_pci_operations;
414 e->size = dev->cfg_size;
420 int pci_proc_detach_device(struct pci_dev *dev)
422 struct proc_dir_entry *e;
424 if ((e = dev->procent)) {
425 if (atomic_read(&e->count) > 1)
427 remove_proc_entry(e->name, dev->bus->procdir);
434 int pci_proc_attach_bus(struct pci_bus* bus)
436 struct proc_dir_entry *de = bus->procdir;
438 if (!proc_initialized)
443 sprintf(name, "%02x", bus->number);
444 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
452 int pci_proc_detach_bus(struct pci_bus* bus)
454 struct proc_dir_entry *de = bus->procdir;
456 remove_proc_entry(de->name, proc_bus_pci_dir);
460 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
462 return seq_open(file, &proc_bus_pci_devices_op);
464 static const struct file_operations proc_bus_pci_dev_operations = {
465 .open = proc_bus_pci_dev_open,
468 .release = seq_release,
471 static int __init pci_proc_init(void)
473 struct proc_dir_entry *entry;
474 struct pci_dev *dev = NULL;
475 proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
476 entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
478 entry->proc_fops = &proc_bus_pci_dev_operations;
479 proc_initialized = 1;
480 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
481 pci_proc_attach_device(dev);
486 __initcall(pci_proc_init);