[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / proc.c

/*
 *	$Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
 *
 *	Procfs interface for the PCI bus.
 *
 *	Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <linux/capability.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include "pci.h"

static int proc_initialized;	/* = 0 */

static loff_t
proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
{
	loff_t new = -1;
	struct inode *inode = file->f_path.dentry->d_inode;

	mutex_lock(&inode->i_mutex);
	switch (whence) {
	case 0:
		new = off;
		break;
	case 1:
		new = file->f_pos + off;
		break;
	case 2:
		new = inode->i_size + off;
		break;
	}
	if (new < 0 || new > inode->i_size)
		new = -EINVAL;
	else
		file->f_pos = new;
	mutex_unlock(&inode->i_mutex);
	return new;
}

static ssize_t
proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
	const struct inode *ino = file->f_path.dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(ino);
	struct pci_dev *dev = dp->data;
	unsigned int pos = *ppos;
	unsigned 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 = dp->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;
		pci_user_read_config_byte(dev, pos, &val);
		__put_user(val, buf);
		buf++;
		pos++;
		cnt--;
	}

	if ((pos & 3) && cnt > 2) {
		unsigned short val;
		pci_user_read_config_word(dev, pos, &val);
		__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
		buf += 2;
		pos += 2;
		cnt -= 2;
	}

	while (cnt >= 4) {
		unsigned int val;
		pci_user_read_config_dword(dev, pos, &val);
		__put_user(cpu_to_le32(val), (unsigned int __user *) buf);
		buf += 4;
		pos += 4;
		cnt -= 4;
	}

	if (cnt >= 2) {
		unsigned short val;
		pci_user_read_config_word(dev, pos, &val);
		__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
		buf += 2;
		pos += 2;
		cnt -= 2;
	}

	if (cnt) {
		unsigned char val;
		pci_user_read_config_byte(dev, 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 __user *buf, size_t nbytes, loff_t *ppos)
{
	struct inode *ino = file->f_path.dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(ino);
	struct pci_dev *dev = dp->data;
	int pos = *ppos;
	int size = dp->size;
	int cnt;

	if (pos >= size)
		return 0;
	if (nbytes >= size)
		nbytes = size;
	if (pos + nbytes > size)
		nbytes = size - pos;
	cnt = nbytes;

	if (!access_ok(VERIFY_READ, buf, cnt))
		return -EINVAL;

	if ((pos & 1) && cnt) {
		unsigned char val;
		__get_user(val, buf);
		pci_user_write_config_byte(dev, pos, val);
		buf++;
		pos++;
		cnt--;
	}

	if ((pos & 3) && cnt > 2) {
		unsigned short val;
		__get_user(val, (unsigned short __user *) buf);
		pci_user_write_config_word(dev, pos, le16_to_cpu(val));
		buf += 2;
		pos += 2;
		cnt -= 2;
	}

	while (cnt >= 4) {
		unsigned int val;
		__get_user(val, (unsigned int __user *) buf);
		pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
		buf += 4;
		pos += 4;
		cnt -= 4;
	}

	if (cnt >= 2) {
		unsigned short val;
		__get_user(val, (unsigned short __user *) buf);
		pci_user_write_config_word(dev, pos, le16_to_cpu(val));
		buf += 2;
		pos += 2;
		cnt -= 2;
	}

	if (cnt) {
		unsigned char val;
		__get_user(val, buf);
		pci_user_write_config_byte(dev, pos, val);
		buf++;
		pos++;
		cnt--;
	}

	*ppos = pos;
	i_size_write(ino, dp->size);
	return nbytes;
}

struct pci_filp_private {
	enum pci_mmap_state mmap_state;
	int write_combine;
};

static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
			       unsigned long arg)
{
	const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
	struct pci_dev *dev = dp->data;
#ifdef HAVE_PCI_MMAP
	struct pci_filp_private *fpriv = file->private_data;
#endif /* HAVE_PCI_MMAP */
	int ret = 0;

	lock_kernel();

	switch (cmd) {
	case PCIIOC_CONTROLLER:
		ret = pci_domain_nr(dev->bus);
		break;

#ifdef HAVE_PCI_MMAP
	case PCIIOC_MMAP_IS_IO:
		fpriv->mmap_state = pci_mmap_io;
		break;

	case PCIIOC_MMAP_IS_MEM:
		fpriv->mmap_state = pci_mmap_mem;
		break;

	case PCIIOC_WRITE_COMBINE:
		if (arg)
			fpriv->write_combine = 1;
		else
			fpriv->write_combine = 0;
		break;

#endif /* HAVE_PCI_MMAP */

	default:
		ret = -EINVAL;
		break;
	};

	unlock_kernel();
	return ret;
}

#ifdef HAVE_PCI_MMAP
static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(inode);
	struct pci_dev *dev = dp->data;
	struct pci_filp_private *fpriv = file->private_data;
	int ret;

	if (!capable(CAP_SYS_RAWIO))
		return -EPERM;

	ret = pci_mmap_page_range(dev, vma,
				  fpriv->mmap_state,
				  fpriv->write_combine);
	if (ret < 0)
		return ret;

	return 0;
}

static int proc_bus_pci_open(struct inode *inode, struct file *file)
{
	struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);

	if (!fpriv)
		return -ENOMEM;

	fpriv->mmap_state = pci_mmap_io;
	fpriv->write_combine = 0;

	file->private_data = fpriv;

	return 0;
}

static int proc_bus_pci_release(struct inode *inode, struct file *file)
{
	kfree(file->private_data);
	file->private_data = NULL;

	return 0;
}
#endif /* HAVE_PCI_MMAP */

static const struct file_operations proc_bus_pci_operations = {
	.llseek		= proc_bus_pci_lseek,
	.read		= proc_bus_pci_read,
	.write		= proc_bus_pci_write,
	.unlocked_ioctl	= proc_bus_pci_ioctl,
#ifdef HAVE_PCI_MMAP
	.open		= proc_bus_pci_open,
	.release	= proc_bus_pci_release,
	.mmap		= proc_bus_pci_mmap,
#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
	.get_unmapped_area = get_pci_unmapped_area,
#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
#endif /* HAVE_PCI_MMAP */
};

/* iterator */
static void *pci_seq_start(struct seq_file *m, loff_t *pos)
{
	struct pci_dev *dev = NULL;
	loff_t n = *pos;

	for_each_pci_dev(dev) {
		if (!n--)
			break;
	}
	return dev;
}

static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct pci_dev *dev = v;

	(*pos)++;
	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	return dev;
}

static void pci_seq_stop(struct seq_file *m, void *v)
{
	if (v) {
		struct pci_dev *dev = v;
		pci_dev_put(dev);
	}
}

static int show_device(struct seq_file *m, void *v)
{
	const struct pci_dev *dev = v;
	const struct pci_driver *drv;
	int i;

	if (dev == NULL)
		return 0;

	drv = pci_dev_driver(dev);
	seq_printf(m, "%02x%02x\t%04x%04x\t%x",
			dev->bus->number,
			dev->devfn,
			dev->vendor,
			dev->device,
			dev->irq);
	/* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
	for (i=0; i<7; i++) {
		resource_size_t start, end;
		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
		seq_printf(m, "\t%16llx",
			(unsigned long long)(start |
			(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	}
	for (i=0; i<7; i++) {
		resource_size_t start, end;
		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
		seq_printf(m, "\t%16llx",
			dev->resource[i].start < dev->resource[i].end ?
			(unsigned long long)(end - start) + 1 : 0);
	}
	seq_putc(m, '\t');
	if (drv)
		seq_printf(m, "%s", drv->name);
	seq_putc(m, '\n');
	return 0;
}

static const struct seq_operations proc_bus_pci_devices_op = {
	.start	= pci_seq_start,
	.next	= pci_seq_next,
	.stop	= pci_seq_stop,
	.show	= show_device
};

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 *e;
	char name[16];

	if (!proc_initialized)
		return -EACCES;

	if (!bus->procdir) {
		if (pci_proc_domain(bus)) {
			sprintf(name, "%04x:%02x", pci_domain_nr(bus),
					bus->number);
		} else {
			sprintf(name, "%02x", bus->number);
		}
		bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
		if (!bus->procdir)
			return -ENOMEM;
	}

	sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
	e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
	if (!e)
		return -ENOMEM;
	e->proc_fops = &proc_bus_pci_operations;
	e->data = dev;
	e->size = dev->cfg_size;
	dev->procent = e;

	return 0;
}

int pci_proc_detach_device(struct pci_dev *dev)
{
	struct proc_dir_entry *e;

	if ((e = dev->procent)) {
		if (atomic_read(&e->count) > 1)
			return -EBUSY;
		remove_proc_entry(e->name, dev->bus->procdir);
		dev->procent = NULL;
	}
	return 0;
}

#if 0
int pci_proc_attach_bus(struct pci_bus* bus)
{
	struct proc_dir_entry *de = bus->procdir;

	if (!proc_initialized)
		return -EACCES;

	if (!de) {
		char name[16];
		sprintf(name, "%02x", bus->number);
		de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
		if (!de)
			return -ENOMEM;
	}
	return 0;
}
#endif  /*  0  */

int pci_proc_detach_bus(struct pci_bus* bus)
{
	struct proc_dir_entry *de = bus->procdir;
	if (de)
		remove_proc_entry(de->name, proc_bus_pci_dir);
	return 0;
}

static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &proc_bus_pci_devices_op);
}
static const struct file_operations proc_bus_pci_dev_operations = {
	.open		= proc_bus_pci_dev_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init pci_proc_init(void)
{
	struct proc_dir_entry *entry;
	struct pci_dev *dev = NULL;
	proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
	entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
	if (entry)
		entry->proc_fops = &proc_bus_pci_dev_operations;
	proc_initialized = 1;
	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		pci_proc_attach_device(dev);
	}
	return 0;
}

__initcall(pci_proc_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
	3	*
	4	* Procfs interface for the PCI bus.
	5	*
	6	* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
	7	*/
	8
	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>
add77184	14	#include <linux/smp_lock.h>
aa0ac365	15	#include <linux/capability.h>
1da177e4 LT	16	#include <asm/uaccess.h>
1da177e4 LT	17	#include <asm/byteorder.h>
bc56b9e0	18	#include "pci.h"
1da177e4 LT	19
	20	static int proc_initialized; /* = 0 */
	21
	22	static loff_t
	23	proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
	24	{
	25	loff_t new = -1;
46cc65a7	26	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4	27
1b1dcc1b	28	mutex_lock(&inode->i_mutex);
1da177e4 LT	29	switch (whence) {
	30	case 0:
	31	new = off;
	32	break;
	33	case 1:
	34	new = file->f_pos + off;
	35	break;
	36	case 2:
	37	new = inode->i_size + off;
	38	break;
	39	}
	40	if (new < 0 \|\| new > inode->i_size)
	41	new = -EINVAL;
	42	else
	43	file->f_pos = new;
1b1dcc1b	44	mutex_unlock(&inode->i_mutex);
1da177e4 LT	45	return new;
	46	}
	47
	48	static ssize_t
	49	proc_bus_pci_read(struct file file, char __user buf, size_t nbytes, loff_t *ppos)
	50	{
46cc65a7	51	const struct inode *ino = file->f_path.dentry->d_inode;
1da177e4 LT	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;
	56
	57	/*
	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).
	61	*/
	62
	63	if (capable(CAP_SYS_ADMIN))
cd68602f	64	size = dp->size;
1da177e4 LT	65	else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	66	size = 128;
	67	else
	68	size = 64;
	69
	70	if (pos >= size)
	71	return 0;
	72	if (nbytes >= size)
	73	nbytes = size;
	74	if (pos + nbytes > size)
	75	nbytes = size - pos;
	76	cnt = nbytes;
	77
	78	if (!access_ok(VERIFY_WRITE, buf, cnt))
	79	return -EINVAL;
	80
	81	if ((pos & 1) && cnt) {
	82	unsigned char val;
e04b0ea2	83	pci_user_read_config_byte(dev, pos, &val);
1da177e4 LT	84	__put_user(val, buf);
	85	buf++;
	86	pos++;
	87	cnt--;
	88	}
	89
	90	if ((pos & 3) && cnt > 2) {
	91	unsigned short val;
e04b0ea2	92	pci_user_read_config_word(dev, pos, &val);
1da177e4 LT	93	__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
	94	buf += 2;
	95	pos += 2;
	96	cnt -= 2;
	97	}
	98
	99	while (cnt >= 4) {
	100	unsigned int val;
e04b0ea2	101	pci_user_read_config_dword(dev, pos, &val);
1da177e4 LT	102	__put_user(cpu_to_le32(val), (unsigned int __user *) buf);
	103	buf += 4;
	104	pos += 4;
	105	cnt -= 4;
	106	}
	107
	108	if (cnt >= 2) {
	109	unsigned short val;
e04b0ea2	110	pci_user_read_config_word(dev, pos, &val);
1da177e4 LT	111	__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
	112	buf += 2;
	113	pos += 2;
	114	cnt -= 2;
	115	}
	116
	117	if (cnt) {
	118	unsigned char val;
e04b0ea2	119	pci_user_read_config_byte(dev, pos, &val);
1da177e4 LT	120	__put_user(val, buf);
	121	buf++;
	122	pos++;
	123	cnt--;
	124	}
	125
	126	*ppos = pos;
	127	return nbytes;
	128	}
	129
	130	static ssize_t
	131	proc_bus_pci_write(struct file file, const char __user buf, size_t nbytes, loff_t *ppos)
	132	{
ecb39080	133	struct inode *ino = file->f_path.dentry->d_inode;
1da177e4 LT	134	const struct proc_dir_entry *dp = PDE(ino);
	135	struct pci_dev *dev = dp->data;
	136	int pos = *ppos;
cd68602f	137	int size = dp->size;
1da177e4 LT	138	int cnt;
	139
	140	if (pos >= size)
	141	return 0;
	142	if (nbytes >= size)
	143	nbytes = size;
	144	if (pos + nbytes > size)
	145	nbytes = size - pos;
	146	cnt = nbytes;
	147
	148	if (!access_ok(VERIFY_READ, buf, cnt))
	149	return -EINVAL;
	150
	151	if ((pos & 1) && cnt) {
	152	unsigned char val;
	153	__get_user(val, buf);
e04b0ea2	154	pci_user_write_config_byte(dev, pos, val);
1da177e4 LT	155	buf++;
	156	pos++;
	157	cnt--;
	158	}
	159
	160	if ((pos & 3) && cnt > 2) {
	161	unsigned short val;
	162	__get_user(val, (unsigned short __user *) buf);
e04b0ea2	163	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
1da177e4 LT	164	buf += 2;
	165	pos += 2;
	166	cnt -= 2;
	167	}
	168
	169	while (cnt >= 4) {
	170	unsigned int val;
	171	__get_user(val, (unsigned int __user *) buf);
e04b0ea2	172	pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
1da177e4 LT	173	buf += 4;
	174	pos += 4;
	175	cnt -= 4;
	176	}
	177
	178	if (cnt >= 2) {
	179	unsigned short val;
	180	__get_user(val, (unsigned short __user *) buf);
e04b0ea2	181	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
1da177e4 LT	182	buf += 2;
	183	pos += 2;
	184	cnt -= 2;
	185	}
	186
	187	if (cnt) {
	188	unsigned char val;
	189	__get_user(val, buf);
e04b0ea2	190	pci_user_write_config_byte(dev, pos, val);
1da177e4 LT	191	buf++;
	192	pos++;
	193	cnt--;
	194	}
	195
	196	*ppos = pos;
ecb39080	197	i_size_write(ino, dp->size);
1da177e4 LT	198	return nbytes;
	199	}
	200
	201	struct pci_filp_private {
	202	enum pci_mmap_state mmap_state;
	203	int write_combine;
	204	};
	205
add77184 MS	206	static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
add77184 MS	207	unsigned long arg)
1da177e4	208	{
add77184	209	const struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
1da177e4 LT	210	struct pci_dev *dev = dp->data;
	211	#ifdef HAVE_PCI_MMAP
	212	struct pci_filp_private *fpriv = file->private_data;
	213	#endif /* HAVE_PCI_MMAP */
	214	int ret = 0;
	215
add77184 MS	216	lock_kernel();
add77184 MS	217
1da177e4 LT	218	switch (cmd) {
	219	case PCIIOC_CONTROLLER:
	220	ret = pci_domain_nr(dev->bus);
	221	break;
	222
	223	#ifdef HAVE_PCI_MMAP
	224	case PCIIOC_MMAP_IS_IO:
	225	fpriv->mmap_state = pci_mmap_io;
	226	break;
	227
	228	case PCIIOC_MMAP_IS_MEM:
	229	fpriv->mmap_state = pci_mmap_mem;
	230	break;
	231
	232	case PCIIOC_WRITE_COMBINE:
	233	if (arg)
	234	fpriv->write_combine = 1;
	235	else
	236	fpriv->write_combine = 0;
	237	break;
	238
	239	#endif /* HAVE_PCI_MMAP */
	240
	241	default:
	242	ret = -EINVAL;
	243	break;
	244	};
	245
add77184	246	unlock_kernel();
1da177e4 LT	247	return ret;
	248	}
	249
	250	#ifdef HAVE_PCI_MMAP
	251	static int proc_bus_pci_mmap(struct file file, struct vm_area_struct vma)
	252	{
46cc65a7	253	struct inode *inode = file->f_path.dentry->d_inode;
1da177e4 LT	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;
	257	int ret;
	258
	259	if (!capable(CAP_SYS_RAWIO))
	260	return -EPERM;
	261
	262	ret = pci_mmap_page_range(dev, vma,
	263	fpriv->mmap_state,
	264	fpriv->write_combine);
	265	if (ret < 0)
	266	return ret;
	267
	268	return 0;
	269	}
	270
	271	static int proc_bus_pci_open(struct inode inode, struct file file)
	272	{
	273	struct pci_filp_private fpriv = kmalloc(sizeof(fpriv), GFP_KERNEL);
	274
	275	if (!fpriv)
	276	return -ENOMEM;
	277
	278	fpriv->mmap_state = pci_mmap_io;
	279	fpriv->write_combine = 0;
	280
	281	file->private_data = fpriv;
	282
	283	return 0;
	284	}
	285
	286	static int proc_bus_pci_release(struct inode inode, struct file file)
	287	{
	288	kfree(file->private_data);
	289	file->private_data = NULL;
	290
	291	return 0;
	292	}
	293	#endif /* HAVE_PCI_MMAP */
	294
d54b1fdb	295	static const struct file_operations proc_bus_pci_operations = {
1da177e4 LT	296	.llseek = proc_bus_pci_lseek,
	297	.read = proc_bus_pci_read,
	298	.write = proc_bus_pci_write,
add77184	299	.unlocked_ioctl = proc_bus_pci_ioctl,
1da177e4 LT	300	#ifdef HAVE_PCI_MMAP
	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 */
	308	};
	309
1da177e4 LT	310	/* iterator */
	311	static void pci_seq_start(struct seq_file m, loff_t *pos)
	312	{
	313	struct pci_dev *dev = NULL;
	314	loff_t n = *pos;
	315
	316	for_each_pci_dev(dev) {
	317	if (!n--)
	318	break;
	319	}
	320	return dev;
	321	}
	322
	323	static void pci_seq_next(struct seq_file m, void v, loff_t pos)
	324	{
	325	struct pci_dev *dev = v;
	326
	327	(*pos)++;
	328	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	329	return dev;
	330	}
	331
	332	static void pci_seq_stop(struct seq_file m, void v)
	333	{
	334	if (v) {
	335	struct pci_dev *dev = v;
	336	pci_dev_put(dev);
	337	}
	338	}
	339
	340	static int show_device(struct seq_file m, void v)
	341	{
	342	const struct pci_dev *dev = v;
	343	const struct pci_driver *drv;
	344	int i;
	345
	346	if (dev == NULL)
	347	return 0;
	348
	349	drv = pci_dev_driver(dev);
	350	seq_printf(m, "%02x%02x\t%04x%04x\t%x",
	351	dev->bus->number,
	352	dev->devfn,
	353	dev->vendor,
	354	dev->device,
	355	dev->irq);
	356	/* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
2311b1f2	357	for (i=0; i<7; i++) {
e31dd6e4	358	resource_size_t start, end;
2311b1f2	359	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
1396a8c3 GKH	360	seq_printf(m, "\t%16llx",
	361	(unsigned long long)(start \|
	362	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
2311b1f2 ME	363	}
2311b1f2 ME	364	for (i=0; i<7; i++) {
e31dd6e4	365	resource_size_t start, end;
2311b1f2	366	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
1396a8c3	367	seq_printf(m, "\t%16llx",
1da177e4	368	dev->resource[i].start < dev->resource[i].end ?
1396a8c3	369	(unsigned long long)(end - start) + 1 : 0);
2311b1f2	370	}
1da177e4 LT	371	seq_putc(m, '\t');
	372	if (drv)
	373	seq_printf(m, "%s", drv->name);
	374	seq_putc(m, '\n');
	375	return 0;
	376	}
	377
02d90fc3	378	static const struct seq_operations proc_bus_pci_devices_op = {
1da177e4 LT	379	.start = pci_seq_start,
	380	.next = pci_seq_next,
	381	.stop = pci_seq_stop,
	382	.show = show_device
	383	};
	384
	385	static struct proc_dir_entry *proc_bus_pci_dir;
	386
	387	int pci_proc_attach_device(struct pci_dev *dev)
	388	{
	389	struct pci_bus *bus = dev->bus;
	390	struct proc_dir_entry *e;
	391	char name[16];
	392
	393	if (!proc_initialized)
	394	return -EACCES;
	395
	396	if (!bus->procdir) {
	397	if (pci_proc_domain(bus)) {
	398	sprintf(name, "%04x:%02x", pci_domain_nr(bus),
	399	bus->number);
	400	} else {
	401	sprintf(name, "%02x", bus->number);
	402	}
	403	bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
	404	if (!bus->procdir)
	405	return -ENOMEM;
	406	}
	407
	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);
	410	if (!e)
	411	return -ENOMEM;
	412	e->proc_fops = &proc_bus_pci_operations;
	413	e->data = dev;
	414	e->size = dev->cfg_size;
	415	dev->procent = e;
	416
	417	return 0;
	418	}
	419
	420	int pci_proc_detach_device(struct pci_dev *dev)
	421	{
	422	struct proc_dir_entry *e;
	423
	424	if ((e = dev->procent)) {
79df4c60	425	if (atomic_read(&e->count) > 1)
1da177e4 LT	426	return -EBUSY;
	427	remove_proc_entry(e->name, dev->bus->procdir);
	428	dev->procent = NULL;
	429	}
	430	return 0;
	431	}
	432
54c762fe	433	#if 0
1da177e4 LT	434	int pci_proc_attach_bus(struct pci_bus* bus)
	435	{
	436	struct proc_dir_entry *de = bus->procdir;
	437
	438	if (!proc_initialized)
	439	return -EACCES;
	440
	441	if (!de) {
	442	char name[16];
	443	sprintf(name, "%02x", bus->number);
	444	de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
	445	if (!de)
	446	return -ENOMEM;
	447	}
	448	return 0;
	449	}
54c762fe	450	#endif /* 0 */
1da177e4 LT	451
	452	int pci_proc_detach_bus(struct pci_bus* bus)
	453	{
	454	struct proc_dir_entry *de = bus->procdir;
	455	if (de)
	456	remove_proc_entry(de->name, proc_bus_pci_dir);
	457	return 0;
	458	}
	459
1da177e4 LT	460	static int proc_bus_pci_dev_open(struct inode inode, struct file file)
	461	{
	462	return seq_open(file, &proc_bus_pci_devices_op);
	463	}
d54b1fdb	464	static const struct file_operations proc_bus_pci_dev_operations = {
1da177e4 LT	465	.open = proc_bus_pci_dev_open,
	466	.read = seq_read,
	467	.llseek = seq_lseek,
	468	.release = seq_release,
	469	};
	470
	471	static int __init pci_proc_init(void)
	472	{
	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);
	477	if (entry)
	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);
	482	}
1da177e4 LT	483	return 0;
	484	}
	485
	486	__initcall(pci_proc_init);
	487