Release 4.14 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 <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);
}

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2
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5
11.36%
1
20.00%
Andrew Morton
3
6.82%
1
20.00%
Total
44
100.00%
5
100.00%



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(VERIFY_WRITE, 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;
}

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28.57%
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2.61%
1
7.14%
Brian King
5
1.31%
1
7.14%
Harvey Harrison
3
0.78%
1
7.14%
Greg Kroah-Hartman
2
0.52%
2
14.29%
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383
100.00%
14
100.00%



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;

	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;

	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;
}

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3.03%
2
16.67%
Huang Ying
10
2.75%
1
8.33%
David Rientjes
7
1.93%
1
8.33%
Harvey Harrison
6
1.65%
1
8.33%
Brian King
5
1.38%
1
8.33%
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363
100.00%
12
100.00%


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;

	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 */
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

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8
5.48%
3
37.50%
Matthew Wilcox
3
2.05%
1
12.50%
Mathieu Segaud
2
1.37%
1
12.50%
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146
100.00%
8
100.00%

#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))
		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_ROM_RESOURCE; i++) {
		if (dev->resource[i].flags & res_bit &&
		    pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
			break;
	}

	if (i >= PCI_ROM_RESOURCE)
		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;
}

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40
19.70%
1
8.33%
Björn Helgaas
15
7.39%
1
8.33%
Al Viro
8
3.94%
3
25.00%
Martin Wilck
2
0.99%
1
8.33%
Total
203
100.00%
12
100.00%



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;
}

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

	return 0;
}
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#endif /* HAVE_PCI_MMAP */


static const struct file_operations proc_bus_pci_operations = {
	.owner		= THIS_MODULE,
	.llseek		= proc_bus_pci_lseek,
	.read		= proc_bus_pci_read,
	.write		= proc_bus_pci_write,
	.unlocked_ioctl	= proc_bus_pci_ioctl,
	.compat_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;
}

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6
13.33%
1
20.00%
Linus Torvalds (pre-git)
6
13.33%
2
40.00%
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45
100.00%
5
100.00%



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;
}

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2
4.26%
1
33.33%
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47
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3
100.00%



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

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1
3.03%
1
25.00%
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33
100.00%
4
100.00%



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_printf(m, "%s", drv->name);
	seq_putc(m, '\n');
	return 0;
}

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21.84%
1
8.33%
Linus Torvalds
39
14.94%
1
8.33%
Greg Kroah-Hartman
14
5.36%
3
25.00%
Yu Zhao
5
1.92%
1
8.33%
Total
261
100.00%
12
100.00%


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_operations, dev);
	if (!e)
		return -ENOMEM;
	proc_set_size(e, dev->cfg_size);
	dev->procent = e;

	return 0;
}

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2
22.22%
Greg Kroah-Hartman
12
6.70%
2
22.22%
Denis V. Lunev
6
3.35%
1
11.11%
David Howells
4
2.23%
1
11.11%
Total
179
100.00%
9
100.00%



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

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7.69%
1
50.00%
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100.00%
2
100.00%



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

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100.00%
3
100.00%



static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &proc_bus_pci_devices_op);
}

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2
8.00%
1
33.33%
Total
25
100.00%
3
100.00%


static const struct file_operations proc_bus_pci_dev_operations = {
	.owner		= THIS_MODULE,
	.open		= proc_bus_pci_dev_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};



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

	return 0;
}
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11.32%
2
20.00%
Linus Torvalds
3
5.66%
1
10.00%
Denis V. Lunev
3
5.66%
1
10.00%
Vasiliy Kulikov
2
3.77%
1
10.00%
Alexey Dobriyan
2
3.77%
1
10.00%
Total
53
100.00%
10
100.00%


device_initcall(pci_proc_init);
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20.83%
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24.23%
5
6.94%
Greg Kroah-Hartman
98
4.62%
10
13.89%
David Woodhouse
84
3.96%
5
6.94%
Al Viro
60
2.83%
5
6.94%
Michael Ellerman
57
2.69%
1
1.39%
Matthew Wilcox
49
2.31%
3
4.17%
Jesse Barnes
40
1.89%
1
1.39%
Art Haas
32
1.51%
1
1.39%
Huang Ying
20
0.94%
1
1.39%
Denis V. Lunev
19
0.90%
1
1.39%
Björn Helgaas
15
0.71%
1
1.39%
Brian King
10
0.47%
1
1.39%
Harvey Harrison
9
0.42%
1
1.39%
David Howells
8
0.38%
2
2.78%
David Rientjes
7
0.33%
1
1.39%
Patrick Mochel
6
0.28%
2
2.78%
Rolf Eike Beer
6
0.28%
1
1.39%
Alexey Dobriyan
5
0.24%
2
2.78%
Yu Zhao
5
0.24%
1
1.39%
Arnd Bergmann
5
0.24%
1
1.39%
Mathieu Segaud
3
0.14%
1
1.39%
Andrew Morton
3
0.14%
1
1.39%
Tejun Heo
3
0.14%
1
1.39%
Ivan Kokshaysky
3
0.14%
1
1.39%
Vasiliy Kulikov
2
0.09%
1
1.39%
Martin Wilck
2
0.09%
1
1.39%
Arjan van de Ven
2
0.09%
1
1.39%
Christoph Hellwig
1
0.05%
1
1.39%
Robert P. J. Day
1
0.05%
1
1.39%
Adrian Bunk
1
0.05%
1
1.39%
Jan Engelhardt
1
0.05%
1
1.39%
Ryan Desfosses
0.00%
0
0.00%
Total
2121
100.00%
72
100.00%
Directory: drivers/pci

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