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* $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
*
* Procfs interface for the PCI bus.
*
* Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#define PCI_CFG_SPACE_SIZE 256
static loff_t
proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
{
loff_t new;
switch (whence) {
case 0:
new = off;
break;
case 1:
new = file->f_pos + off;
break;
case 2:
new = PCI_CFG_SPACE_SIZE + off;
break;
default:
return -EINVAL;
}
if (new < 0 || new > PCI_CFG_SPACE_SIZE)
return -EINVAL;
return (file->f_pos = new);
}
static ssize_t
proc_bus_pci_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
{
struct inode *ino = file->f_dentry->d_inode;
struct proc_dir_entry *dp = ino->u.generic_ip;
struct pci_dev *dev = dp->data;
int pos = *ppos;
unsigned char bus = dev->bus->number;
unsigned char dfn = dev->devfn;
int cnt, size;
/*
* Normal users can read only the standardized portion of the
* configuration space as several chips lock up when trying to read
* undefined locations (think of Intel PIIX4 as a typical example).
*/
if (capable(CAP_SYS_ADMIN))
size = PCI_CFG_SPACE_SIZE;
else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
size = 128;
else
size = 64;
if (pos >= size)
return 0;
if (nbytes >= size)
nbytes = size;
if (pos + nbytes > size)
nbytes = size - pos;
cnt = nbytes;
if (!access_ok(VERIFY_WRITE, buf, cnt))
return -EINVAL;
if ((pos & 1) && cnt) {
unsigned char val;
pcibios_read_config_byte(bus, dfn, pos, &val);
__put_user(val, buf);
buf++;
pos++;
cnt--;
}
if ((pos & 3) && cnt > 2) {
unsigned short val;
pcibios_read_config_word(bus, dfn, pos, &val);
__put_user(cpu_to_le16(val), (unsigned short *) buf);
buf += 2;
pos += 2;
cnt -= 2;
}
while (cnt >= 4) {
unsigned int val;
pcibios_read_config_dword(bus, dfn, pos, &val);
__put_user(cpu_to_le32(val), (unsigned int *) buf);
buf += 4;
pos += 4;
cnt -= 4;
}
if (cnt >= 2) {
unsigned short val;
pcibios_read_config_word(bus, dfn, pos, &val);
__put_user(cpu_to_le16(val), (unsigned short *) buf);
buf += 2;
pos += 2;
cnt -= 2;
}
if (cnt) {
unsigned char val;
pcibios_read_config_byte(bus, dfn, pos, &val);
__put_user(val, buf);
buf++;
pos++;
cnt--;
}
*ppos = pos;
return nbytes;
}
static ssize_t
proc_bus_pci_write(struct file *file, const char *buf, size_t nbytes, loff_t *ppos)
{
struct inode *ino = file->f_dentry->d_inode;
struct proc_dir_entry *dp = ino->u.generic_ip;
struct pci_dev *dev = dp->data;
int pos = *ppos;
unsigned char bus = dev->bus->number;
unsigned char dfn = dev->devfn;
int cnt;
if (pos >= PCI_CFG_SPACE_SIZE)
return 0;
if (nbytes >= PCI_CFG_SPACE_SIZE)
nbytes = PCI_CFG_SPACE_SIZE;
if (pos + nbytes > PCI_CFG_SPACE_SIZE)
nbytes = PCI_CFG_SPACE_SIZE - pos;
cnt = nbytes;
if (!access_ok(VERIFY_READ, buf, cnt))
return -EINVAL;
if ((pos & 1) && cnt) {
unsigned char val;
__get_user(val, buf);
pcibios_write_config_byte(bus, dfn, pos, val);
buf++;
pos++;
cnt--;
}
if ((pos & 3) && cnt > 2) {
unsigned short val;
__get_user(val, (unsigned short *) buf);
pcibios_write_config_word(bus, dfn, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
cnt -= 2;
}
while (cnt >= 4) {
unsigned int val;
__get_user(val, (unsigned int *) buf);
pcibios_write_config_dword(bus, dfn, pos, le32_to_cpu(val));
buf += 4;
pos += 4;
cnt -= 4;
}
if (cnt >= 2) {
unsigned short val;
__get_user(val, (unsigned short *) buf);
pcibios_write_config_word(bus, dfn, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
cnt -= 2;
}
if (cnt) {
unsigned char val;
__get_user(val, buf);
pcibios_write_config_byte(bus, dfn, pos, val);
buf++;
pos++;
cnt--;
}
*ppos = pos;
return nbytes;
}
static struct file_operations proc_bus_pci_operations = {
proc_bus_pci_lseek,
proc_bus_pci_read,
proc_bus_pci_write,
NULL, /* readdir */
NULL, /* poll */
NULL, /* ioctl */
NULL, /* mmap */
NULL, /* no special open code */
NULL, /* flush */
NULL, /* no special release code */
NULL /* can't fsync */
};
static struct inode_operations proc_bus_pci_inode_operations = {
&proc_bus_pci_operations, /* default base directory file-ops */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL /* permission */
};
int
get_pci_dev_info(char *buf, char **start, off_t pos, int count, int wr)
{
struct pci_dev *dev = pci_devices;
off_t at = 0;
int len, i, cnt;
cnt = 0;
while (dev && count > cnt) {
len = sprintf(buf, "%02x%02x\t%04x%04x\t%x",
dev->bus->number,
dev->devfn,
dev->vendor,
dev->device,
dev->irq);
for(i=0; i<6; i++)
len += sprintf(buf+len,
#if BITS_PER_LONG == 32
"\t%08lx",
#else
"\t%016lx",
#endif
dev->base_address[i]);
len += sprintf(buf+len,
#if BITS_PER_LONG == 32
"\t%08lx",
#else
"\t%016lx",
#endif
dev->rom_address);
buf[len++] = '\n';
at += len;
if (at >= pos) {
if (!*start) {
*start = buf + (pos - (at - len));
cnt = at - pos;
} else
cnt += len;
buf += len;
}
dev = dev->next;
}
return (count > cnt) ? cnt : count;
}
static struct proc_dir_entry proc_pci_devices = {
PROC_BUS_PCI_DEVICES, 7, "devices",
S_IFREG | S_IRUGO, 1, 0, 0,
0, &proc_array_inode_operations,
get_pci_dev_info
};
static struct proc_dir_entry *proc_bus_pci_dir;
int pci_proc_attach_device(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;
struct proc_dir_entry *de, *e;
char name[16];
if (!(de = bus->procdir)) {
sprintf(name, "%02x", bus->number);
de = bus->procdir = create_proc_entry(name, S_IFDIR, proc_bus_pci_dir);
if (!de)
return -ENOMEM;
}
sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
e = dev->procent = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, de);
if (!e)
return -ENOMEM;
e->ops = &proc_bus_pci_inode_operations;
e->data = dev;
e->size = PCI_CFG_SPACE_SIZE;
return 0;
}
int pci_proc_detach_device(struct pci_dev *dev)
{
struct proc_dir_entry *e;
if ((e = dev->procent)) {
if (e->count)
return -EBUSY;
remove_proc_entry(e->name, dev->bus->procdir);
dev->procent = NULL;
}
return 0;
}
__initfunc(void proc_bus_pci_add(struct pci_bus *bus))
{
while (bus) {
struct pci_dev *dev;
for(dev = bus->devices; dev; dev = dev->sibling)
pci_proc_attach_device(dev);
if (bus->children)
proc_bus_pci_add(bus->children);
bus = bus->next;
}
}
__initfunc(void pci_proc_init(void))
{
if (!pci_present())
return;
proc_bus_pci_dir = create_proc_entry("pci", S_IFDIR, proc_bus);
proc_register(proc_bus_pci_dir, &proc_pci_devices);
proc_bus_pci_add(&pci_root);
#ifdef CONFIG_PCI_OLD_PROC
proc_old_pci_init();
#endif
}
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