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/sched.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/export.h>
#include <linux/topology.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/capability.h>
#include <linux/security.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <linux/pm_runtime.h>
#include <linux/of.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);		\
}									\
static DEVICE_ATTR_RO(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);
	unsigned long val;

	if (kstrtoul(buf, 0, &val) < 0)
		return -EINVAL;

	pdev->broken_parity_status = !!val;

	return count;
}
static DEVICE_ATTR_RW(broken_parity_status);

static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
				      struct device_attribute *attr, char *buf)
{
	const struct cpumask *mask;

#ifdef CONFIG_NUMA
	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
					  cpumask_of_node(dev_to_node(dev));
#else
	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
	return cpumap_print_to_pagebuf(list, buf, mask);
}

static ssize_t local_cpus_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	return pci_dev_show_local_cpu(dev, false, attr, buf);
}
static DEVICE_ATTR_RO(local_cpus);

static ssize_t local_cpulist_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	return pci_dev_show_local_cpu(dev, true, attr, buf);
}
static DEVICE_ATTR_RO(local_cpulist);

/*
 * PCI Bus Class Devices
 */
static ssize_t cpuaffinity_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));

	return cpumap_print_to_pagebuf(false, buf, cpumask);
}
static DEVICE_ATTR_RO(cpuaffinity);

static ssize_t cpulistaffinity_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));

	return cpumap_print_to_pagebuf(true, buf, cpumask);
}
static DEVICE_ATTR_RO(cpulistaffinity);

/* 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;
	resource_size_t start, end;

	if (pci_dev->subordinate)
		max = DEVICE_COUNT_RESOURCE;
	else
		max = PCI_BRIDGE_RESOURCES;

	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 DEVICE_ATTR_RO(resource);

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 DEVICE_ATTR_RO(modalias);

static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned long val;
	ssize_t result = kstrtoul(buf, 0, &val);

	if (result < 0)
		return result;

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

	if (!val) {
		if (pci_is_enabled(pdev))
			pci_disable_device(pdev);
		else
			result = -EIO;
	} else
		result = pci_enable_device(pdev);

	return result < 0 ? result : count;
}

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

	pdev = to_pci_dev(dev);
	return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
}
static DEVICE_ATTR_RW(enable);

#ifdef CONFIG_NUMA
static ssize_t numa_node_store(struct device *dev,
			       struct device_attribute *attr, const char *buf,
			       size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	int node, ret;

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

	ret = kstrtoint(buf, 0, &node);
	if (ret)
		return ret;

	if ((node < 0 && node !=