path: root/drivers/pci/pci-sysfs.c

/*
 * drivers/pci/pci-sysfs.c
 *
 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
 * (C) Copyright 2002-2004 IBM Corp.
 * (C) Copyright 2003 Matthew Wilcox
 * (C) Copyright 2003 Hewlett-Packard
 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
 *
 * File attributes for PCI devices
 *
 * Modeled after usb's driverfs.c 
 *
 */


#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/topology.h>
#include <linux/mm.h>
#include <linux/capability.h>
#include <linux/pci-aspm.h>
#include "pci.h"

static int sysfs_initialized;	/* = 0 */

/* show configuration fields */
#define pci_config_attr(field, format_string)				\
static ssize_t								\
field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
{									\
	struct pci_dev *pdev;						\
									\
	pdev = to_pci_dev (dev);					\
	return sprintf (buf, format_string, pdev->field);		\
}

pci_config_attr(vendor, "0x%04x\n");
pci_config_attr(device, "0x%04x\n");
pci_config_attr(subsystem_vendor, "0x%04x\n");
pci_config_attr(subsystem_device, "0x%04x\n");
pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");

static ssize_t broken_parity_status_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	return sprintf (buf, "%u\n", pdev->broken_parity_status);
}

static ssize_t broken_parity_status_store(struct device *dev,
					  struct device_attribute *attr,
					  const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	ssize_t consumed = -EINVAL;

	if ((count > 0) && (*buf == '0' || *buf == '1')) {
		pdev->broken_parity_status = *buf == '1' ? 1 : 0;
		consumed = count;
	}
	return consumed;
}

static ssize_t local_cpus_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{		
	cpumask_t mask;
	int len;

	mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
	len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
	buf[len++] = '\n';
	buf[len] = '\0';
	return len;
}


static ssize_t local_cpulist_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	cpumask_t mask;
	int len;

	mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
	len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
	buf[len++] = '\n';
	buf[len] = '\0';
	return len;
}

/* show resources */
static ssize_t
resource_show(struct device * dev, struct device_attribute *attr, char * buf)
{
	struct pci_dev * pci_dev = to_pci_dev(dev);
	char * str = buf;
	int i;
	int max = 7;
	resource_size_t start, end;

	if (pci_dev->subordinate)
		max = DEVICE_COUNT_RESOURCE;

	for (i = 0; i < max; i++) {
		struct resource *res =  &pci_dev->resource[i];
		pci_resource_to_user(pci_dev, i, res, &start, &end);
		str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
			       (unsigned long long)start,
			       (unsigned long long)end,
			       (unsigned long long)res->flags);
	}
	return (str - buf);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);

	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
		       pci_dev->vendor, pci_dev->device,
		       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
		       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
		       (u8)(pci_dev->class));
}

static ssize_t is_enabled_store(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	ssize_t result = -EINVAL;
	struct pci_dev *pdev = to_pci_dev(dev);

	/* this can crash the machine when done on the "wrong" device */
	if (!capable(CAP_SYS_ADMIN))
		return count;

	if (*buf == '0') {
		if (atomic_read(&pdev->enable_cnt) != 0)
			pci_disable_device(pdev);
		else
			result = -EIO;
	} else if (*buf == '1')
		result = pci_enable_device(pdev);

	return result < 0 ? result : count;
}

static ssize_t is_enabled_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev (dev);
	return sprintf (buf,