Release 4.7 drivers/pci/proc.c

Directory: drivers/pci
/*
 *      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 <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)
{
	struct pci_dev *dev = PDE_DATA(file_inode(file));
	return fixed_size_llseek(file, off, whence, dev->cfg_size);
}

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pre-git pre-git 20 45.45% 1 20.00%
al viro al viro 16 36.36% 2 40.00%
greg kroah-hartman greg kroah-hartman 5 11.36% 1 20.00%
andrew morton 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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pre-git pre-git 350 91.38% 5 35.71%
al viro al viro 13 3.39% 4 28.57%
huang ying huang ying 10 2.61% 1 7.14%
brian king brian king 5 1.31% 1 7.14%
harvey harrison harvey harrison 3 0.78% 1 7.14%
greg kroah-hartman greg kroah-hartman 2 0.52% 2 14.29%
Total 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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pre-git pre-git 309 85.12% 2 16.67%
al viro al viro 15 4.13% 4 33.33%
greg kroah-hartman greg kroah-hartman 11 3.03% 2 16.67%
huang ying huang ying 10 2.75% 1 8.33%
david rientjes david rientjes 7 1.93% 1 8.33%
harvey harrison harvey harrison 6 1.65% 1 8.33%
brian king brian king 5 1.38% 1 8.33%
Total 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:
		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;
	}

	return ret;
}

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linus torvalds linus torvalds 115 89.84% 1 16.67%
al viro al viro 8 6.25% 3 50.00%
matthew wilcox matthew wilcox 3 2.34% 1 16.67%
mathieu segaud mathieu segaud 2 1.56% 1 16.67%
Total 128 100.00% 6 100.00%

#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;

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

	/* Make sure the caller is mapping a real resource for this device */
	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
			break;
	}

	if (i >= PCI_ROM_RESOURCE)
		return -ENODEV;

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

	return 0;
}

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linus torvalds linus torvalds 74 59.68% 2 28.57%
jesse barnes jesse barnes 40 32.26% 1 14.29%
al viro al viro 8 6.45% 3 42.86%
martin wilck martin wilck 2 1.61% 1 14.29%
Total 124 100.00% 7 100.00%



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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linus torvalds linus torvalds 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



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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linus torvalds linus torvalds 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%

#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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linus torvalds linus torvalds 26 57.78% 1 20.00%
greg kroah-hartman greg kroah-hartman 7 15.56% 1 20.00%
rolf eike beer rolf eike beer 6 13.33% 1 20.00%
pre-git pre-git 6 13.33% 2 40.00%
Total 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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linus torvalds linus torvalds 31 65.96% 1 33.33%
greg kroah-hartman greg kroah-hartman 14 29.79% 1 33.33%
pre-git pre-git 2 4.26% 1 33.33%
Total 47 100.00% 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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greg kroah-hartman greg kroah-hartman 18 54.55% 2 50.00%
linus torvalds linus torvalds 14 42.42% 1 25.00%
pre-git pre-git 1 3.03% 1 25.00%
Total 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;
}

Contributors
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pre-git pre-git 146 55.94% 6 50.00%
michael ellerman michael ellerman 57 21.84% 1 8.33%
linus torvalds linus torvalds 39 14.94% 1 8.33%
greg kroah-hartman greg kroah-hartman 14 5.36% 3 25.00%
yu zhao 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;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 111 62.01% 3 33.33%
matthew wilcox matthew wilcox 46 25.70% 2 22.22%
greg kroah-hartman greg kroah-hartman 12 6.70% 2 22.22%
denis v. lunev denis v. lunev 6 3.35% 1 11.11%
david howells 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;
}

Contributors
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pre-git pre-git 24 92.31% 2 66.67%
david howells david howells 2 7.69% 1 33.33%
Total 26 100.00% 3 100.00%



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

Contributors
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linus torvalds linus torvalds 18 90.00% 2 66.67%
david howells david howells 2 10.00% 1 33.33%
Total 20 100.00% 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);
}

Contributors
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linus torvalds linus torvalds 15 60.00% 1 33.33%
pre-git pre-git 8 32.00% 1 33.33%
patrick mochel patrick mochel 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;
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 37 69.81% 4 40.00%
greg kroah-hartman greg kroah-hartman 6 11.32% 2 20.00%
denis v. lunev denis v. lunev 3 5.66% 1 10.00%
linus torvalds linus torvalds 3 5.66% 1 10.00%
vasiliy kulikov vasiliy kulikov 2 3.77% 1 10.00%
alexey dobriyan alexey dobriyan 2 3.77% 1 10.00%
Total 53 100.00% 10 100.00%


device_initcall(pci_proc_init);
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 1051 51.95% 15 23.44%
linus torvalds linus torvalds 515 25.46% 4 6.25%
greg kroah-hartman greg kroah-hartman 97 4.79% 9 14.06%
al viro al viro 60 2.97% 5 7.81%
michael ellerman michael ellerman 57 2.82% 1 1.56%
matthew wilcox matthew wilcox 49 2.42% 3 4.69%
jesse barnes jesse barnes 40 1.98% 1 1.56%
art haas art haas 32 1.58% 1 1.56%
huang ying huang ying 20 0.99% 1 1.56%
denis v. lunev denis v. lunev 19 0.94% 1 1.56%
brian king brian king 10 0.49% 1 1.56%
harvey harrison harvey harrison 9 0.44% 1 1.56%
david howells david howells 8 0.40% 2 3.12%
david rientjes david rientjes 7 0.35% 1 1.56%
rolf eike beer rolf eike beer 6 0.30% 1 1.56%
patrick mochel patrick mochel 6 0.30% 2 3.12%
alexey dobriyan alexey dobriyan 5 0.25% 2 3.12%
yu zhao yu zhao 5 0.25% 1 1.56%
arnd bergmann arnd bergmann 5 0.25% 1 1.56%
mathieu segaud mathieu segaud 3 0.15% 1 1.56%
ivan kokshaysky ivan kokshaysky 3 0.15% 1 1.56%
andrew morton andrew morton 3 0.15% 1 1.56%
tejun heo tejun heo 3 0.15% 1 1.56%
vasiliy kulikov vasiliy kulikov 2 0.10% 1 1.56%
arjan van de ven arjan van de ven 2 0.10% 1 1.56%
martin wilck martin wilck 2 0.10% 1 1.56%
jan engelhardt jan engelhardt 1 0.05% 1 1.56%
christoph hellwig christoph hellwig 1 0.05% 1 1.56%
adrian bunk adrian bunk 1 0.05% 1 1.56%
robert p. j. day robert p. j. day 1 0.05% 1 1.56%
ryan desfosses ryan desfosses 0.00% 0 0.00%
Total 2023 100.00% 64 100.00%
  Directory: drivers/pci

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	Person	Tokens	Prop	Commits	CommitProp
pre-git	pre-git	20	45.45%	1	20.00%
al viro	al viro	16	36.36%	2	40.00%
greg kroah-hartman	greg kroah-hartman	5	11.36%	1	20.00%
andrew morton	andrew morton	3	6.82%	1	20.00%
	Total	44	100.00%	5	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/pci/proc.c

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