[mirror_ubuntu-jammy-kernel.git] / drivers / pci / proc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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/slab.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/capability.h>
#include <linux/uaccess.h>
#include <linux/security.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)
{
	struct pci_dev *dev = PDE_DATA(file_inode(file));
	return fixed_size_llseek(file, off, whence, dev->cfg_size);
}

static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
				 size_t nbytes, loff_t *ppos)
{
	struct pci_dev *dev = PDE_DATA(file_inode(file));
	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 = dev->cfg_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(buf, cnt))
		return -EINVAL;

	pci_config_pm_runtime_get(dev);

	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), (__le16 __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), (__le32 __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), (__le16 __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--;
	}

	pci_config_pm_runtime_put(dev);

	*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_inode(file);
	struct pci_dev *dev = PDE_DATA(ino);
	int pos = *ppos;
	int size = dev->cfg_size;
	int cnt, ret;

	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
	if (ret)
		return ret;

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

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

	pci_config_pm_runtime_get(dev);

	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) {
		__le16 val;
		__get_user(val, (__le16 __user *) buf);
		pci_user_write_config_word(dev, pos, le16_to_cpu(val));
		buf += 2;
		pos += 2;
		cnt -= 2;
	}

	while (cnt >= 4) {
		__le32 val;
		__get_user(val, (__le32 __user *) buf);
		pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
		buf += 4;
		pos += 4;
		cnt -= 4;
	}

	if (cnt >= 2) {
		__le16 val;
		__get_user(val, (__le16 __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--;
	}

	pci_config_pm_runtime_put(dev);

	*ppos = pos;
	i_size_write(ino, dev->cfg_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)
{
	struct pci_dev *dev = PDE_DATA(file_inode(file));
#ifdef HAVE_PCI_MMAP
	struct pci_filp_private *fpriv = file->private_data;
#endif /* HAVE_PCI_MMAP */
	int ret = 0;

	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
	if (ret)
		return ret;

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

#ifdef HAVE_PCI_MMAP
	case PCIIOC_MMAP_IS_IO:
		if (!arch_can_pci_mmap_io())
			return -EINVAL;
		fpriv->mmap_state = pci_mmap_io;
		break;

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

	case PCIIOC_WRITE_COMBINE:
		if (arch_can_pci_mmap_wc()) {
			if (arg)
				fpriv->write_combine = 1;
			else
				fpriv->write_combine = 0;
			break;
		}
		/* If arch decided it can't, fall through... */
#endif /* HAVE_PCI_MMAP */
		/* fall through */
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

#ifdef HAVE_PCI_MMAP
static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct pci_dev *dev = PDE_DATA(file_inode(file));
	struct pci_filp_private *fpriv = file->private_data;
	int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;

	if (!capable(CAP_SYS_RAWIO) ||
	    security_locked_down(LOCKDOWN_PCI_ACCESS))
		return -EPERM;

	if (fpriv->mmap_state == pci_mmap_io) {
		if (!arch_can_pci_mmap_io())
			return -EINVAL;
		res_bit = IORESOURCE_IO;
	}

	/* Make sure the caller is mapping a real resource for this device */
	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
		if (dev->resource[i].flags & res_bit &&
		    pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
			break;
	}

	if (i >= PCI_STD_NUM_BARS)
		return -ENODEV;

	if (fpriv->mmap_state == pci_mmap_mem &&
	    fpriv->write_combine) {
		if (dev->resource[i].flags & IORESOURCE_PREFETCH)
			write_combine = 1;
		else
			return -EINVAL;
	}
	ret = pci_mmap_page_range(dev, i, vma,
				  fpriv->mmap_state, 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 proc_ops proc_bus_pci_ops = {
	.proc_lseek	= proc_bus_pci_lseek,
	.proc_read	= proc_bus_pci_read,
	.proc_write	= proc_bus_pci_write,
	.proc_ioctl	= proc_bus_pci_ioctl,
#ifdef CONFIG_COMPAT
	.proc_compat_ioctl = proc_bus_pci_ioctl,
#endif
#ifdef HAVE_PCI_MMAP
	.proc_open	= proc_bus_pci_open,
	.proc_release	= proc_bus_pci_release,
	.proc_mmap	= proc_bus_pci_mmap,
#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
	.proc_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);

	/* only print standard and ROM resources to preserve compatibility */
	for (i = 0; i <= PCI_ROM_RESOURCE; 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 <= PCI_ROM_RESOURCE; 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_puts(m, 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 = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
			     &proc_bus_pci_ops, dev);
	if (!e)
		return -ENOMEM;
	proc_set_size(e, dev->cfg_size);
	dev->procent = e;

	return 0;
}

int pci_proc_detach_device(struct pci_dev *dev)
{
	proc_remove(dev->procent);
	dev->procent = NULL;
	return 0;
}

int pci_proc_detach_bus(struct pci_bus *bus)
{
	proc_remove(bus->procdir);
	return 0;
}

static int __init pci_proc_init(void)
{
	struct pci_dev *dev = NULL;
	proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
	proc_create_seq("devices", 0, proc_bus_pci_dir,
		    &proc_bus_pci_devices_op);
	proc_initialized = 1;
	for_each_pci_dev(dev)
		pci_proc_attach_device(dev);

	return 0;
}
device_initcall(pci_proc_init);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
df62ab5e	3	* Procfs interface for the PCI bus
1da177e4	4	*
df62ab5e	5	* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
1da177e4 LT	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/pci.h>
5a0e3ad6	10	#include <linux/slab.h>
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/proc_fs.h>
	13	#include <linux/seq_file.h>
aa0ac365	14	#include <linux/capability.h>
7c0f6ba6	15	#include <linux/uaccess.h>
eb627e17	16	#include <linux/security.h>
1da177e4	17	#include <asm/byteorder.h>
bc56b9e0	18	#include "pci.h"
1da177e4 LT	19
	20	static int proc_initialized; /* = 0 */
	21
3c78bc61	22	static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
1da177e4	23	{
54de90d6 AV	24	struct pci_dev *dev = PDE_DATA(file_inode(file));
54de90d6 AV	25	return fixed_size_llseek(file, off, whence, dev->cfg_size);
1da177e4 LT	26	}
1da177e4 LT	27
3c78bc61 RD	28	static ssize_t proc_bus_pci_read(struct file file, char __user buf,
3c78bc61 RD	29	size_t nbytes, loff_t *ppos)
1da177e4	30	{
d9dda78b	31	struct pci_dev *dev = PDE_DATA(file_inode(file));
1da177e4 LT	32	unsigned int pos = *ppos;
	33	unsigned int cnt, size;
	34
	35	/*
	36	* Normal users can read only the standardized portion of the
	37	* configuration space as several chips lock up when trying to read
	38	* undefined locations (think of Intel PIIX4 as a typical example).
	39	*/
	40
	41	if (capable(CAP_SYS_ADMIN))
d9dda78b	42	size = dev->cfg_size;
1da177e4 LT	43	else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	44	size = 128;
	45	else
	46	size = 64;
	47
	48	if (pos >= size)
	49	return 0;
	50	if (nbytes >= size)
	51	nbytes = size;
	52	if (pos + nbytes > size)
	53	nbytes = size - pos;
	54	cnt = nbytes;
	55
96d4f267	56	if (!access_ok(buf, cnt))
1da177e4 LT	57	return -EINVAL;
1da177e4 LT	58
b3c32c4f HY	59	pci_config_pm_runtime_get(dev);
b3c32c4f HY	60
1da177e4 LT	61	if ((pos & 1) && cnt) {
1da177e4 LT	62	unsigned char val;
e04b0ea2	63	pci_user_read_config_byte(dev, pos, &val);
1da177e4 LT	64	__put_user(val, buf);
	65	buf++;
	66	pos++;
	67	cnt--;
	68	}
	69
	70	if ((pos & 3) && cnt > 2) {
	71	unsigned short val;
e04b0ea2	72	pci_user_read_config_word(dev, pos, &val);
f17a077e	73	__put_user(cpu_to_le16(val), (__le16 __user *) buf);
1da177e4 LT	74	buf += 2;
	75	pos += 2;
	76	cnt -= 2;
	77	}
	78
	79	while (cnt >= 4) {
	80	unsigned int val;
e04b0ea2	81	pci_user_read_config_dword(dev, pos, &val);
f17a077e	82	__put_user(cpu_to_le32(val), (__le32 __user *) buf);
1da177e4 LT	83	buf += 4;
	84	pos += 4;
	85	cnt -= 4;
	86	}
	87
	88	if (cnt >= 2) {
	89	unsigned short val;
e04b0ea2	90	pci_user_read_config_word(dev, pos, &val);
f17a077e	91	__put_user(cpu_to_le16(val), (__le16 __user *) buf);
1da177e4 LT	92	buf += 2;
	93	pos += 2;
	94	cnt -= 2;
	95	}
	96
	97	if (cnt) {
	98	unsigned char val;
e04b0ea2	99	pci_user_read_config_byte(dev, pos, &val);
1da177e4 LT	100	__put_user(val, buf);
	101	buf++;
	102	pos++;
	103	cnt--;
	104	}
	105
b3c32c4f HY	106	pci_config_pm_runtime_put(dev);
b3c32c4f HY	107
1da177e4 LT	108	*ppos = pos;
	109	return nbytes;
	110	}
	111
3c78bc61 RD	112	static ssize_t proc_bus_pci_write(struct file file, const char __user buf,
3c78bc61 RD	113	size_t nbytes, loff_t *ppos)
1da177e4	114	{
496ad9aa	115	struct inode *ino = file_inode(file);
d9dda78b	116	struct pci_dev *dev = PDE_DATA(ino);
1da177e4	117	int pos = *ppos;
d9dda78b	118	int size = dev->cfg_size;
eb627e17 MG	119	int cnt, ret;
	120
	121	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
	122	if (ret)
	123	return ret;
1da177e4 LT	124
	125	if (pos >= size)
	126	return 0;
	127	if (nbytes >= size)
	128	nbytes = size;
	129	if (pos + nbytes > size)
	130	nbytes = size - pos;
	131	cnt = nbytes;
	132
96d4f267	133	if (!access_ok(buf, cnt))
1da177e4 LT	134	return -EINVAL;
1da177e4 LT	135
b3c32c4f HY	136	pci_config_pm_runtime_get(dev);
b3c32c4f HY	137
1da177e4 LT	138	if ((pos & 1) && cnt) {
	139	unsigned char val;
	140	__get_user(val, buf);
e04b0ea2	141	pci_user_write_config_byte(dev, pos, val);
1da177e4 LT	142	buf++;
	143	pos++;
	144	cnt--;
	145	}
	146
	147	if ((pos & 3) && cnt > 2) {
f17a077e HH	148	__le16 val;
f17a077e HH	149	__get_user(val, (__le16 __user *) buf);
e04b0ea2	150	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
1da177e4 LT	151	buf += 2;
	152	pos += 2;
	153	cnt -= 2;
	154	}
	155
	156	while (cnt >= 4) {
f17a077e HH	157	__le32 val;
f17a077e HH	158	__get_user(val, (__le32 __user *) buf);
e04b0ea2	159	pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
1da177e4 LT	160	buf += 4;
	161	pos += 4;
	162	cnt -= 4;
	163	}
	164
	165	if (cnt >= 2) {
f17a077e HH	166	__le16 val;
f17a077e HH	167	__get_user(val, (__le16 __user *) buf);
e04b0ea2	168	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
1da177e4 LT	169	buf += 2;
	170	pos += 2;
	171	cnt -= 2;
	172	}
	173
	174	if (cnt) {
	175	unsigned char val;
	176	__get_user(val, buf);
e04b0ea2	177	pci_user_write_config_byte(dev, pos, val);
1da177e4 LT	178	buf++;
	179	pos++;
	180	cnt--;
	181	}
	182
b3c32c4f HY	183	pci_config_pm_runtime_put(dev);
b3c32c4f HY	184
1da177e4	185	*ppos = pos;
d9dda78b	186	i_size_write(ino, dev->cfg_size);
1da177e4 LT	187	return nbytes;
	188	}
	189
	190	struct pci_filp_private {
	191	enum pci_mmap_state mmap_state;
	192	int write_combine;
	193	};
	194
add77184 MS	195	static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
add77184 MS	196	unsigned long arg)
1da177e4	197	{
d9dda78b	198	struct pci_dev *dev = PDE_DATA(file_inode(file));
1da177e4 LT	199	#ifdef HAVE_PCI_MMAP
	200	struct pci_filp_private *fpriv = file->private_data;
	201	#endif /* HAVE_PCI_MMAP */
	202	int ret = 0;
	203
eb627e17 MG	204	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
	205	if (ret)
	206	return ret;
	207
1da177e4 LT	208	switch (cmd) {
	209	case PCIIOC_CONTROLLER:
	210	ret = pci_domain_nr(dev->bus);
	211	break;
	212
	213	#ifdef HAVE_PCI_MMAP
	214	case PCIIOC_MMAP_IS_IO:
e854d8b2 DW	215	if (!arch_can_pci_mmap_io())
e854d8b2 DW	216	return -EINVAL;
1da177e4 LT	217	fpriv->mmap_state = pci_mmap_io;
	218	break;
	219
	220	case PCIIOC_MMAP_IS_MEM:
	221	fpriv->mmap_state = pci_mmap_mem;
	222	break;
	223
	224	case PCIIOC_WRITE_COMBINE:
ae749c7a DW	225	if (arch_can_pci_mmap_wc()) {
	226	if (arg)
	227	fpriv->write_combine = 1;
	228	else
	229	fpriv->write_combine = 0;
	230	break;
	231	}
	232	/* If arch decided it can't, fall through... */
1da177e4	233	#endif /* HAVE_PCI_MMAP */
296bd5ae	234	/* fall through */
1da177e4 LT	235	default:
	236	ret = -EINVAL;
	237	break;
f7625980	238	}
1da177e4 LT	239
	240	return ret;
	241	}
	242
	243	#ifdef HAVE_PCI_MMAP
	244	static int proc_bus_pci_mmap(struct file file, struct vm_area_struct vma)
	245	{
d9dda78b	246	struct pci_dev *dev = PDE_DATA(file_inode(file));
1da177e4	247	struct pci_filp_private *fpriv = file->private_data;
e854d8b2	248	int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
1da177e4	249
eb627e17 MG	250	if (!capable(CAP_SYS_RAWIO) \|\|
eb627e17 MG	251	security_locked_down(LOCKDOWN_PCI_ACCESS))
1da177e4 LT	252	return -EPERM;
1da177e4 LT	253
e854d8b2 DW	254	if (fpriv->mmap_state == pci_mmap_io) {
	255	if (!arch_can_pci_mmap_io())
	256	return -EINVAL;
17caf567	257	res_bit = IORESOURCE_IO;
e854d8b2	258	}
17caf567	259
9eff02e2	260	/* Make sure the caller is mapping a real resource for this device */
c9c13ba4	261	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
17caf567 DW	262	if (dev->resource[i].flags & res_bit &&
17caf567 DW	263	pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
9eff02e2 JB	264	break;
	265	}
	266
c9c13ba4	267	if (i >= PCI_STD_NUM_BARS)
9eff02e2 JB	268	return -ENODEV;
9eff02e2 JB	269
cef4d023 DW	270	if (fpriv->mmap_state == pci_mmap_mem &&
	271	fpriv->write_combine) {
	272	if (dev->resource[i].flags & IORESOURCE_PREFETCH)
	273	write_combine = 1;
	274	else
	275	return -EINVAL;
	276	}
f66e2258	277	ret = pci_mmap_page_range(dev, i, vma,
3a92c319	278	fpriv->mmap_state, write_combine);
1da177e4 LT	279	if (ret < 0)
	280	return ret;
	281
	282	return 0;
	283	}
	284
	285	static int proc_bus_pci_open(struct inode inode, struct file file)
	286	{
	287	struct pci_filp_private fpriv = kmalloc(sizeof(fpriv), GFP_KERNEL);
	288
	289	if (!fpriv)
	290	return -ENOMEM;
	291
	292	fpriv->mmap_state = pci_mmap_io;
	293	fpriv->write_combine = 0;
	294
	295	file->private_data = fpriv;
	296
	297	return 0;
	298	}
	299
	300	static int proc_bus_pci_release(struct inode inode, struct file file)
	301	{
	302	kfree(file->private_data);
	303	file->private_data = NULL;
	304
	305	return 0;
	306	}
	307	#endif /* HAVE_PCI_MMAP */
	308
97a32539 AD	309	static const struct proc_ops proc_bus_pci_ops = {
	310	.proc_lseek = proc_bus_pci_lseek,
	311	.proc_read = proc_bus_pci_read,
	312	.proc_write = proc_bus_pci_write,
	313	.proc_ioctl = proc_bus_pci_ioctl,
	314	#ifdef CONFIG_COMPAT
	315	.proc_compat_ioctl = proc_bus_pci_ioctl,
	316	#endif
1da177e4	317	#ifdef HAVE_PCI_MMAP
97a32539 AD	318	.proc_open = proc_bus_pci_open,
	319	.proc_release = proc_bus_pci_release,
	320	.proc_mmap = proc_bus_pci_mmap,
1da177e4	321	#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
97a32539	322	.proc_get_unmapped_area = get_pci_unmapped_area,
1da177e4 LT	323	#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
	324	#endif /* HAVE_PCI_MMAP */
	325	};
	326
1da177e4 LT	327	/* iterator */
	328	static void pci_seq_start(struct seq_file m, loff_t *pos)
	329	{
	330	struct pci_dev *dev = NULL;
	331	loff_t n = *pos;
	332
	333	for_each_pci_dev(dev) {
	334	if (!n--)
	335	break;
	336	}
	337	return dev;
	338	}
	339
	340	static void pci_seq_next(struct seq_file m, void v, loff_t pos)
	341	{
	342	struct pci_dev *dev = v;
	343
	344	(*pos)++;
	345	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	346	return dev;
	347	}
	348
	349	static void pci_seq_stop(struct seq_file m, void v)
	350	{
	351	if (v) {
	352	struct pci_dev *dev = v;
	353	pci_dev_put(dev);
	354	}
	355	}
	356
	357	static int show_device(struct seq_file m, void v)
	358	{
	359	const struct pci_dev *dev = v;
	360	const struct pci_driver *drv;
	361	int i;
	362
	363	if (dev == NULL)
	364	return 0;
	365
	366	drv = pci_dev_driver(dev);
	367	seq_printf(m, "%02x%02x\t%04x%04x\t%x",
	368	dev->bus->number,
	369	dev->devfn,
	370	dev->vendor,
	371	dev->device,
	372	dev->irq);
fde09c6d YZ	373
	374	/* only print standard and ROM resources to preserve compatibility */
	375	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
e31dd6e4	376	resource_size_t start, end;
2311b1f2	377	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
1396a8c3 GKH	378	seq_printf(m, "\t%16llx",
	379	(unsigned long long)(start \|
	380	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
2311b1f2	381	}
fde09c6d	382	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
e31dd6e4	383	resource_size_t start, end;
2311b1f2	384	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
1396a8c3	385	seq_printf(m, "\t%16llx",
1da177e4	386	dev->resource[i].start < dev->resource[i].end ?
1396a8c3	387	(unsigned long long)(end - start) + 1 : 0);
2311b1f2	388	}
1da177e4 LT	389	seq_putc(m, '\t');
1da177e4 LT	390	if (drv)
590a18e1	391	seq_puts(m, drv->name);
1da177e4 LT	392	seq_putc(m, '\n');
	393	return 0;
	394	}
	395
02d90fc3	396	static const struct seq_operations proc_bus_pci_devices_op = {
1da177e4 LT	397	.start = pci_seq_start,
	398	.next = pci_seq_next,
	399	.stop = pci_seq_stop,
	400	.show = show_device
	401	};
	402
	403	static struct proc_dir_entry *proc_bus_pci_dir;
	404
	405	int pci_proc_attach_device(struct pci_dev *dev)
	406	{
	407	struct pci_bus *bus = dev->bus;
	408	struct proc_dir_entry *e;
	409	char name[16];
	410
	411	if (!proc_initialized)
	412	return -EACCES;
	413
	414	if (!bus->procdir) {
	415	if (pci_proc_domain(bus)) {
	416	sprintf(name, "%04x:%02x", pci_domain_nr(bus),
	417	bus->number);
	418	} else {
	419	sprintf(name, "%02x", bus->number);
	420	}
	421	bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
	422	if (!bus->procdir)
	423	return -ENOMEM;
	424	}
	425
	426	sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
c7705f34	427	e = proc_create_data(name, S_IFREG \| S_IRUGO \| S_IWUSR, bus->procdir,
97a32539	428	&proc_bus_pci_ops, dev);
1da177e4 LT	429	if (!e)
1da177e4 LT	430	return -ENOMEM;
271a15ea	431	proc_set_size(e, dev->cfg_size);
1da177e4 LT	432	dev->procent = e;
	433
	434	return 0;
	435	}
	436
	437	int pci_proc_detach_device(struct pci_dev *dev)
	438	{
a8ca16ea DH	439	proc_remove(dev->procent);
a8ca16ea DH	440	dev->procent = NULL;
1da177e4 LT	441	return 0;
	442	}
	443
3c78bc61	444	int pci_proc_detach_bus(struct pci_bus *bus)
1da177e4	445	{
a8ca16ea	446	proc_remove(bus->procdir);
1da177e4 LT	447	return 0;
	448	}
	449
1da177e4 LT	450	static int __init pci_proc_init(void)
1da177e4 LT	451	{
1da177e4	452	struct pci_dev *dev = NULL;
9c37066d	453	proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
fddda2b7 CH	454	proc_create_seq("devices", 0, proc_bus_pci_dir,
fddda2b7 CH	455	&proc_bus_pci_devices_op);
1da177e4	456	proc_initialized = 1;
4e344b1c	457	for_each_pci_dev(dev)
1da177e4	458	pci_proc_attach_device(dev);
4e344b1c	459
1da177e4 LT	460	return 0;
1da177e4 LT	461	}
eaf61142	462	device_initcall(pci_proc_init);