pci-sysfs.c 44.5 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * (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
 *
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 * Modeled after usb's driverfs.c
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 */


#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
#include <linux/stat.h>
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#include <linux/export.h>
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#include <linux/topology.h>
#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/capability.h>
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#include <linux/security.h>
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#include <linux/pci-aspm.h>
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#include <linux/slab.h>
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#include <linux/vgaarb.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include "pci.h"

static int sysfs_initialized;	/* = 0 */

/* show configuration fields */
#define pci_config_attr(field, format_string)				\
static ssize_t								\
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field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
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{									\
	struct pci_dev *pdev;						\
									\
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	pdev = to_pci_dev(dev);						\
	return sprintf(buf, format_string, pdev->field);		\
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}									\
static DEVICE_ATTR_RO(field)
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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");
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pci_config_attr(revision, "0x%02x\n");
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pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");

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

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

	pdev->broken_parity_status = !!val;

	return count;
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}
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static DEVICE_ATTR_RW(broken_parity_status);
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static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
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				      struct device_attribute *attr, char *buf)
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{
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	const struct cpumask *mask;
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#ifdef CONFIG_NUMA
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	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
					  cpumask_of_node(dev_to_node(dev));
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#else
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	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
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#endif
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	return cpumap_print_to_pagebuf(list, buf, mask);
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}

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static ssize_t local_cpus_show(struct device *dev,
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			       struct device_attribute *attr, char *buf)
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{
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	return pci_dev_show_local_cpu(dev, false, attr, buf);
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}
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static DEVICE_ATTR_RO(local_cpus);
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static ssize_t local_cpulist_show(struct device *dev,
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				  struct device_attribute *attr, char *buf)
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{
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	return pci_dev_show_local_cpu(dev, true, attr, buf);
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}
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static DEVICE_ATTR_RO(local_cpulist);
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/*
 * PCI Bus Class Devices
 */
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static ssize_t cpuaffinity_show(struct device *dev,
				struct device_attribute *attr, char *buf)
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{
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	const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));

	return cpumap_print_to_pagebuf(false, buf, cpumask);
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}
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static DEVICE_ATTR_RO(cpuaffinity);
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static ssize_t cpulistaffinity_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
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{
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	const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));

	return cpumap_print_to_pagebuf(true, buf, cpumask);
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}
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static DEVICE_ATTR_RO(cpulistaffinity);
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/* show resources */
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static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
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{
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	struct pci_dev *pci_dev = to_pci_dev(dev);
	char *str = buf;
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	int i;
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	int max;
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	resource_size_t start, end;
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	if (pci_dev->subordinate)
		max = DEVICE_COUNT_RESOURCE;
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	else
		max = PCI_BRIDGE_RESOURCES;
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	for (i = 0; i < max; i++) {
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		struct resource *res =  &pci_dev->resource[i];
		pci_resource_to_user(pci_dev, i, res, &start, &end);
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		str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
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			       (unsigned long long)start,
			       (unsigned long long)end,
			       (unsigned long long)res->flags);
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	}
	return (str - buf);
}
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static DEVICE_ATTR_RO(resource);
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static ssize_t max_link_speed_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u32 linkcap;
	int err;
	const char *speed;

	err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
	if (err)
		return -EINVAL;

	switch (linkcap & PCI_EXP_LNKCAP_SLS) {
	case PCI_EXP_LNKCAP_SLS_8_0GB:
		speed = "8 GT/s";
		break;
	case PCI_EXP_LNKCAP_SLS_5_0GB:
		speed = "5 GT/s";
		break;
	case PCI_EXP_LNKCAP_SLS_2_5GB:
		speed = "2.5 GT/s";
		break;
	default:
		speed = "Unknown speed";
	}

	return sprintf(buf, "%s\n", speed);
}
static DEVICE_ATTR_RO(max_link_speed);

static ssize_t max_link_width_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u32 linkcap;
	int err;

	err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
	if (err)
		return -EINVAL;

	return sprintf(buf, "%u\n", (linkcap & PCI_EXP_LNKCAP_MLW) >> 4);
}
static DEVICE_ATTR_RO(max_link_width);

static ssize_t current_link_speed_show(struct device *dev,
				       struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u16 linkstat;
	int err;
	const char *speed;

	err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
	if (err)
		return -EINVAL;

	switch (linkstat & PCI_EXP_LNKSTA_CLS) {
	case PCI_EXP_LNKSTA_CLS_8_0GB:
		speed = "8 GT/s";
		break;
	case PCI_EXP_LNKSTA_CLS_5_0GB:
		speed = "5 GT/s";
		break;
	case PCI_EXP_LNKSTA_CLS_2_5GB:
		speed = "2.5 GT/s";
		break;
	default:
		speed = "Unknown speed";
	}

	return sprintf(buf, "%s\n", speed);
}
static DEVICE_ATTR_RO(current_link_speed);

static ssize_t current_link_width_show(struct device *dev,
				       struct device_attribute *attr, char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u16 linkstat;
	int err;

	err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
	if (err)
		return -EINVAL;

	return sprintf(buf, "%u\n",
		(linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
}
static DEVICE_ATTR_RO(current_link_width);

static ssize_t secondary_bus_number_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u8 sec_bus;
	int err;

	err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
	if (err)
		return -EINVAL;

	return sprintf(buf, "%u\n", sec_bus);
}
static DEVICE_ATTR_RO(secondary_bus_number);

static ssize_t subordinate_bus_number_show(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	u8 sub_bus;
	int err;

	err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
	if (err)
		return -EINVAL;

	return sprintf(buf, "%u\n", sub_bus);
}
static DEVICE_ATTR_RO(subordinate_bus_number);

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

	return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
}
static DEVICE_ATTR_RO(ari_enabled);

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

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	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
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		       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));
}
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static DEVICE_ATTR_RO(modalias);
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static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
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			     const char *buf, size_t count)
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{
	struct pci_dev *pdev = to_pci_dev(dev);
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	unsigned long val;
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	ssize_t result = kstrtoul(buf, 0, &val);
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	if (result < 0)
		return result;
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	/* this can crash the machine when done on the "wrong" device */
	if (!capable(CAP_SYS_ADMIN))
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		return -EPERM;
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	if (!val) {
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		if (pci_is_enabled(pdev))
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			pci_disable_device(pdev);
		else
			result = -EIO;
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	} else
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		result = pci_enable_device(pdev);
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	return result < 0 ? result : count;
}

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static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
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			    char *buf)
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{
	struct pci_dev *pdev;
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	pdev = to_pci_dev(dev);
	return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
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}
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static DEVICE_ATTR_RW(enable);
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#ifdef CONFIG_NUMA
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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;

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	if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
		return -EINVAL;

	if (node != NUMA_NO_NODE && !node_online(node))
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		return -EINVAL;

	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
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	pci_alert(pdev, FW_BUG "Overriding NUMA node to %d.  Contact your vendor for updates.",
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		  node);

	dev->numa_node = node;
	return count;
}

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static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
			      char *buf)
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{
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	return sprintf(buf, "%d\n", dev->numa_node);
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}
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static DEVICE_ATTR_RW(numa_node);
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#endif

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

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	return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
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}
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static DEVICE_ATTR_RO(dma_mask_bits);
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static ssize_t consistent_dma_mask_bits_show(struct device *dev,
					     struct device_attribute *attr,
					     char *buf)
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{
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	return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
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}
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static DEVICE_ATTR_RO(consistent_dma_mask_bits);
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static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
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{
	struct pci_dev *pdev = to_pci_dev(dev);
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	struct pci_bus *subordinate = pdev->subordinate;
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	return sprintf(buf, "%u\n", subordinate ?
		       !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
			   : !pdev->no_msi);
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}

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static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
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{
	struct pci_dev *pdev = to_pci_dev(dev);
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	struct pci_bus *subordinate = pdev->subordinate;
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	unsigned long val;

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	if (kstrtoul(buf, 0, &val) < 0)
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		return -EINVAL;
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	if (!capable(CAP_SYS_ADMIN))
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		return -EPERM;
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	/*
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	 * "no_msi" and "bus_flags" only affect what happens when a driver
	 * requests MSI or MSI-X.  They don't affect any drivers that have
	 * already requested MSI or MSI-X.
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	 */
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	if (!subordinate) {
		pdev->no_msi = !val;
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		pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
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			 val ? "allowed" : "disallowed");
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		return count;
	}

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	if (val)
		subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
	else
		subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;

	dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
		 val ? "allowed" : "disallowed");
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	return count;
}
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static DEVICE_ATTR_RW(msi_bus);
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static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
				size_t count)
{
	unsigned long val;
	struct pci_bus *b = NULL;

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

	if (val) {
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		pci_lock_rescan_remove();
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		while ((b = pci_find_next_bus(b)) != NULL)
			pci_rescan_bus(b);
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		pci_unlock_rescan_remove();
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	}
	return count;
}
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static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
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static struct attribute *pci_bus_attrs[] = {
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	&bus_attr_rescan.attr,
	NULL,
};

static const struct attribute_group pci_bus_group = {
	.attrs = pci_bus_attrs,
};

const struct attribute_group *pci_bus_groups[] = {
	&pci_bus_group,
	NULL,
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};
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static ssize_t dev_rescan_store(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
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{
	unsigned long val;
	struct pci_dev *pdev = to_pci_dev(dev);

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

	if (val) {
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		pci_lock_rescan_remove();
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		pci_rescan_bus(pdev->bus);
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		pci_unlock_rescan_remove();
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	}
	return count;
}
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static struct device_attribute dev_rescan_attr = __ATTR(rescan,
							(S_IWUSR|S_IWGRP),
							NULL, dev_rescan_store);
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static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
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{
	unsigned long val;

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

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	if (val && device_remove_file_self(dev, attr))
		pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
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	return count;
}
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static struct device_attribute dev_remove_attr = __ATTR(remove,
							(S_IWUSR|S_IWGRP),
							NULL, remove_store);
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static ssize_t dev_bus_rescan_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
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{
	unsigned long val;
	struct pci_bus *bus = to_pci_bus(dev);

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

	if (val) {
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		pci_lock_rescan_remove();
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		if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
			pci_rescan_bus_bridge_resize(bus->self);
		else
			pci_rescan_bus(bus);
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		pci_unlock_rescan_remove();
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	}
	return count;
}
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static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
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#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
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static ssize_t d3cold_allowed_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;

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

	pdev->d3cold_allowed = !!val;
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	if (pdev->d3cold_allowed)
		pci_d3cold_enable(pdev);
	else
		pci_d3cold_disable(pdev);

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	pm_runtime_resume(dev);

	return count;
}

static ssize_t d3cold_allowed_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);
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	return sprintf(buf, "%u\n", pdev->d3cold_allowed);
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}
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static DEVICE_ATTR_RW(d3cold_allowed);
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#endif

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#ifdef CONFIG_OF
static ssize_t devspec_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct device_node *np = pci_device_to_OF_node(pdev);

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	if (np == NULL)
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		return 0;
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	return sprintf(buf, "%pOF", np);
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}
static DEVICE_ATTR_RO(devspec);
#endif

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#ifdef CONFIG_PCI_IOV
static ssize_t sriov_totalvfs_show(struct device *dev,
				   struct device_attribute *attr,
				   char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

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	return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
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}


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

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	return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
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}

/*
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 * num_vfs > 0; number of VFs to enable
 * num_vfs = 0; disable all VFs
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 *
 * Note: SRIOV spec doesn't allow partial VF
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 *       disable, so it's all or none.
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 */
static ssize_t sriov_numvfs_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
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	int ret;
	u16 num_vfs;
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	ret = kstrtou16(buf, 0, &num_vfs);
	if (ret < 0)
		return ret;

	if (num_vfs > pci_sriov_get_totalvfs(pdev))
		return -ERANGE;

616
	device_lock(&pdev->dev);
617

618
	if (num_vfs == pdev->sriov->num_VFs)
619
		goto exit;
620 621 622

	/* is PF driver loaded w/callback */
	if (!pdev->driver || !pdev->driver->sriov_configure) {
623
		pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
624 625
		ret = -ENOENT;
		goto exit;
626 627
	}

628 629 630
	if (num_vfs == 0) {
		/* disable VFs */
		ret = pdev->driver->sriov_configure(pdev, 0);
631
		goto exit;
632 633
	}

634 635
	/* enable VFs */
	if (pdev->sriov->num_VFs) {
636
		pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
637
			 pdev->sriov->num_VFs, num_vfs);
638 639
		ret = -EBUSY;
		goto exit;
640 641
	}

642 643
	ret = pdev->driver->sriov_configure(pdev, num_vfs);
	if (ret < 0)
644
		goto exit;
645

646
	if (ret != num_vfs)
647
		pci_warn(pdev, "%d VFs requested; only %d enabled\n",
648 649
			 num_vfs, ret);

650
exit:
651
	device_unlock(&pdev->dev);
652 653 654 655

	if (ret < 0)
		return ret;

656
	return count;
657 658
}

659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685
static ssize_t sriov_offset_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	return sprintf(buf, "%u\n", pdev->sriov->offset);
}

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

	return sprintf(buf, "%u\n", pdev->sriov->stride);
}

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

	return sprintf(buf, "%x\n", pdev->sriov->vf_device);
}

686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
					    struct device_attribute *attr,
					    char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
}

static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
					     struct device_attribute *attr,
					     const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	bool drivers_autoprobe;

	if (kstrtobool(buf, &drivers_autoprobe) < 0)
		return -EINVAL;

	pdev->sriov->drivers_autoprobe = drivers_autoprobe;

	return count;
}

710 711 712 713
static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
static struct device_attribute sriov_numvfs_attr =
		__ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
		       sriov_numvfs_show, sriov_numvfs_store);
714 715 716
static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
717 718 719
static struct device_attribute sriov_drivers_autoprobe_attr =
		__ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
		       sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
720 721
#endif /* CONFIG_PCI_IOV */

722 723 724 725 726
static ssize_t driver_override_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct pci_dev *pdev = to_pci_dev(dev);
727
	char *driver_override, *old, *cp;
728

729 730
	/* We need to keep extra room for a newline */
	if (count >= (PAGE_SIZE - 1))
731 732 733 734 735 736 737 738 739 740
		return -EINVAL;

	driver_override = kstrndup(buf, count, GFP_KERNEL);
	if (!driver_override)
		return -ENOMEM;

	cp = strchr(driver_override, '\n');
	if (cp)
		*cp = '\0';

741 742
	device_lock(dev);
	old = pdev->driver_override;
743 744 745 746 747 748
	if (strlen(driver_override)) {
		pdev->driver_override = driver_override;
	} else {
		kfree(driver_override);
		pdev->driver_override = NULL;
	}
749
	device_unlock(dev);
750 751 752 753 754 755 756 757 758 759

	kfree(old);

	return count;
}

static ssize_t driver_override_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev = to_pci_dev(dev);
760
	ssize_t len;
761

762 763 764 765
	device_lock(dev);
	len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
	device_unlock(dev);
	return len;
766 767 768
}
static DEVICE_ATTR_RW(driver_override);

769
static struct attribute *pci_dev_attrs[] = {
770 771 772 773 774
	&dev_attr_resource.attr,
	&dev_attr_vendor.attr,
	&dev_attr_device.attr,
	&dev_attr_subsystem_vendor.attr,
	&dev_attr_subsystem_device.attr,
775
	&dev_attr_revision.attr,
776 777 778 779 780
	&dev_attr_class.attr,
	&dev_attr_irq.attr,
	&dev_attr_local_cpus.attr,
	&dev_attr_local_cpulist.attr,
	&dev_attr_modalias.attr,
781
#ifdef CONFIG_NUMA
782
	&dev_attr_numa_node.attr,
783
#endif
784 785
	&dev_attr_dma_mask_bits.attr,
	&dev_attr_consistent_dma_mask_bits.attr,
786
	&dev_attr_enable.attr,
787 788
	&dev_attr_broken_parity_status.attr,
	&dev_attr_msi_bus.attr,
789
#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
790
	&dev_attr_d3cold_allowed.attr,
791 792 793
#endif
#ifdef CONFIG_OF
	&dev_attr_devspec.attr,
794
#endif
795
	&dev_attr_driver_override.attr,
796
	&dev_attr_ari_enabled.attr,
797 798 799
	NULL,
};

800 801 802 803
static struct attribute *pci_bridge_attrs[] = {
	&dev_attr_subordinate_bus_number.attr,
	&dev_attr_secondary_bus_number.attr,
	NULL,
804 805
};

806 807 808 809 810
static struct attribute *pcie_dev_attrs[] = {
	&dev_attr_current_link_speed.attr,
	&dev_attr_current_link_width.attr,
	&dev_attr_max_link_width.attr,
	&dev_attr_max_link_speed.attr,
811
	NULL,
L
Linus Torvalds 已提交
812 813
};

814 815 816 817 818 819 820 821 822 823 824 825 826 827
static struct attribute *pcibus_attrs[] = {
	&dev_attr_rescan.attr,
	&dev_attr_cpuaffinity.attr,
	&dev_attr_cpulistaffinity.attr,
	NULL,
};

static const struct attribute_group pcibus_group = {
	.attrs = pcibus_attrs,
};

const struct attribute_group *pcibus_groups[] = {
	&pcibus_group,
	NULL,
828 829
};

R
Ryan Desfosses 已提交
830 831
static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
832 833
{
	struct pci_dev *pdev = to_pci_dev(dev);
834 835 836 837
	struct pci_dev *vga_dev = vga_default_device();

	if (vga_dev)
		return sprintf(buf, "%u\n", (pdev == vga_dev));
838 839 840 841 842

	return sprintf(buf, "%u\n",
		!!(pdev->resource[PCI_ROM_RESOURCE].flags &
		   IORESOURCE_ROM_SHADOW));
}
843
static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
844

R
Ryan Desfosses 已提交
845 846 847
static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
			       struct bin_attribute *bin_attr, char *buf,
			       loff_t off, size_t count)
L
Linus Torvalds 已提交
848
{
849
	struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
850 851
	unsigned int size = 64;
	loff_t init_off = off;
R
Ryan Desfosses 已提交
852
	u8 *data = (u8 *) buf;
L
Linus Torvalds 已提交
853 854

	/* Several chips lock up trying to read undefined config space */
855
	if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
L
Linus Torvalds 已提交
856
		size = dev->cfg_size;
R
Ryan Desfosses 已提交
857
	else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
L
Linus Torvalds 已提交
858 859 860 861 862 863 864 865 866 867 868
		size = 128;

	if (off > size)
		return 0;
	if (off + count > size) {
		size -= off;
		count = size;
	} else {
		size = count;
	}

869 870
	pci_config_pm_runtime_get(dev);

871 872
	if ((off & 1) && size) {
		u8 val;
873
		pci_user_read_config_byte(dev, off, &val);
874
		data[off - init_off] = val;
L
Linus Torvalds 已提交
875
		off++;
876 877 878 879 880
		size--;
	}

	if ((off & 3) && size > 2) {
		u16 val;
881
		pci_user_read_config_word(dev, off, &val);
882 883 884 885
		data[off - init_off] = val & 0xff;
		data[off - init_off + 1] = (val >> 8) & 0xff;
		off += 2;
		size -= 2;
L
Linus Torvalds 已提交
886 887 888
	}

	while (size > 3) {
889
		u32 val;
890
		pci_user_read_config_dword(dev, off, &val);
891 892 893 894
		data[off - init_off] = val & 0xff;
		data[off - init_off + 1] = (val >> 8) & 0xff;
		data[off - init_off + 2] = (val >> 16) & 0xff;
		data[off - init_off + 3] = (val >> 24) & 0xff;
L
Linus Torvalds 已提交
895 896 897 898
		off += 4;
		size -= 4;
	}

899 900
	if (size >= 2) {
		u16 val;
901
		pci_user_read_config_word(dev, off, &val);
902 903 904 905 906 907 908 909
		data[off - init_off] = val & 0xff;
		data[off - init_off + 1] = (val >> 8) & 0xff;
		off += 2;
		size -= 2;
	}

	if (size > 0) {
		u8 val;
910
		pci_user_read_config_byte(dev, off, &val);
911
		data[off - init_off] = val;
L
Linus Torvalds 已提交
912 913 914 915
		off++;
		--size;
	}

916 917
	pci_config_pm_runtime_put(dev);

L
Linus Torvalds 已提交
918 919 920
	return count;
}

R
Ryan Desfosses 已提交
921 922 923
static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
				struct bin_attribute *bin_attr, char *buf,
				loff_t off, size_t count)
L
Linus Torvalds 已提交
924
{
925
	struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
926 927
	unsigned int size = count;
	loff_t init_off = off;
R
Ryan Desfosses 已提交
928
	u8 *data = (u8 *) buf;
L
Linus Torvalds 已提交
929 930 931 932 933 934 935

	if (off > dev->cfg_size)
		return 0;
	if (off + count > dev->cfg_size) {
		size = dev->cfg_size - off;
		count = size;
	}
936

937 938
	pci_config_pm_runtime_get(dev);

939
	if ((off & 1) && size) {
940
		pci_user_write_config_byte(dev, off, data[off - init_off]);
L
Linus Torvalds 已提交
941
		off++;
942
		size--;
L
Linus Torvalds 已提交
943
	}
944

945 946 947
	if ((off & 3) && size > 2) {
		u16 val = data[off - init_off];
		val |= (u16) data[off - init_off + 1] << 8;
R
Ryan Desfosses 已提交
948 949 950 951
		pci_user_write_config_word(dev, off, val);
		off += 2;
		size -= 2;
	}
L
Linus Torvalds 已提交
952 953

	while (size > 3) {
954 955 956 957
		u32 val = data[off - init_off];
		val |= (u32) data[off - init_off + 1] << 8;
		val |= (u32) data[off - init_off + 2] << 16;
		val |= (u32) data[off - init_off + 3] << 24;
958
		pci_user_write_config_dword(dev, off, val);
L
Linus Torvalds 已提交
959 960 961
		off += 4;
		size -= 4;
	}
962

963 964 965
	if (size >= 2) {
		u16 val = data[off - init_off];
		val |= (u16) data[off - init_off + 1] << 8;
966
		pci_user_write_config_word(dev, off, val);
967 968 969
		off += 2;
		size -= 2;
	}
L
Linus Torvalds 已提交
970

971
	if (size) {
972
		pci_user_write_config_byte(dev, off, data[off - init_off]);
L
Linus Torvalds 已提交
973 974 975 976
		off++;
		--size;
	}

977 978
	pci_config_pm_runtime_put(dev);

L
Linus Torvalds 已提交
979 980 981
	return count;
}

R
Ryan Desfosses 已提交
982 983 984
static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
			     struct bin_attribute *bin_attr, char *buf,
			     loff_t off, size_t count)
985
{
986
	struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
987

988 989 990 991 992 993
	if (bin_attr->size > 0) {
		if (off > bin_attr->size)
			count = 0;
		else if (count > bin_attr->size - off)
			count = bin_attr->size - off;
	}
994

995
	return pci_read_vpd(dev, off, count, buf);
996 997
}

R
Ryan Desfosses 已提交
998 999 1000
static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
			      struct bin_attribute *bin_attr, char *buf,
			      loff_t off, size_t count)
1001
{
1002
	struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
1003

1004 1005 1006 1007 1008 1009
	if (bin_attr->size > 0) {
		if (off > bin_attr->size)
			count = 0;
		else if (count > bin_attr->size - off)
			count = bin_attr->size - off;
	}
1010

1011
	return pci_write_vpd(dev, off, count, buf);
1012 1013
}

L
Linus Torvalds 已提交
1014 1015 1016
#ifdef HAVE_PCI_LEGACY
/**
 * pci_read_legacy_io - read byte(s) from legacy I/O port space
1017
 * @filp: open sysfs file
L
Linus Torvalds 已提交
1018
 * @kobj: kobject corresponding to file to read from
1019
 * @bin_attr: struct bin_attribute for this file
L
Linus Torvalds 已提交
1020 1021 1022 1023 1024 1025 1026
 * @buf: buffer to store results
 * @off: offset into legacy I/O port space
 * @count: number of bytes to read
 *
 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 * callback routine (pci_legacy_read).
 */
R
Ryan Desfosses 已提交
1027 1028 1029
static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
				  struct bin_attribute *bin_attr, char *buf,
				  loff_t off, size_t count)
L
Linus Torvalds 已提交
1030
{
1031
	struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
1032

R
Ryan Desfosses 已提交
1033 1034 1035
	/* Only support 1, 2 or 4 byte accesses */
	if (count != 1 && count != 2 && count != 4)
		return -EINVAL;
L
Linus Torvalds 已提交
1036

R
Ryan Desfosses 已提交
1037
	return pci_legacy_read(bus, off, (u32 *)buf, count);
L
Linus Torvalds 已提交
1038 1039 1040 1041
}

/**
 * pci_write_legacy_io - write byte(s) to legacy I/O port space
1042
 * @filp: open sysfs file
L
Linus Torvalds 已提交
1043
 * @kobj: kobject corresponding to file to read from
1044
 * @bin_attr: struct bin_attribute for this file
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050 1051
 * @buf: buffer containing value to be written
 * @off: offset into legacy I/O port space
 * @count: number of bytes to write
 *
 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 * callback routine (pci_legacy_write).
 */
R
Ryan Desfosses 已提交
1052 1053 1054
static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
				   struct bin_attribute *bin_attr, char *buf,
				   loff_t off, size_t count)
L
Linus Torvalds 已提交
1055
{
1056
	struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
1057

R
Ryan Desfosses 已提交
1058 1059 1060 1061 1062
	/* Only support 1, 2 or 4 byte accesses */
	if (count != 1 && count != 2 && count != 4)
		return -EINVAL;

	return pci_legacy_write(bus, off, *(u32 *)buf, count);
L
Linus Torvalds 已提交
1063 1064 1065 1066
}

/**
 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1067
 * @filp: open sysfs file
L
Linus Torvalds 已提交
1068 1069 1070 1071
 * @kobj: kobject corresponding to device to be mapped
 * @attr: struct bin_attribute for this file
 * @vma: struct vm_area_struct passed to mmap
 *
1072
 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
L
Linus Torvalds 已提交
1073 1074 1075
 * legacy memory space (first meg of bus space) into application virtual
 * memory space.
 */
R
Ryan Desfosses 已提交
1076 1077 1078
static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
			       struct bin_attribute *attr,
			       struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1079
{
1080
	struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
1081

R
Ryan Desfosses 已提交
1082
	return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1083 1084 1085 1086
}

/**
 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1087
 * @filp: open sysfs file
1088 1089 1090 1091 1092 1093 1094 1095
 * @kobj: kobject corresponding to device to be mapped
 * @attr: struct bin_attribute for this file
 * @vma: struct vm_area_struct passed to mmap
 *
 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
 * legacy IO space (first meg of bus space) into application virtual
 * memory space. Returns -ENOSYS if the operation isn't supported
 */
R
Ryan Desfosses 已提交
1096 1097 1098
static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
			      struct bin_attribute *attr,
			      struct vm_area_struct *vma)
1099
{
1100
	struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1101

R
Ryan Desfosses 已提交
1102
	return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1103 1104
}

1105 1106 1107 1108 1109 1110 1111
/**
 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 * @b: bus to create files under
 * @mmap_type: I/O port or memory
 *
 * Stub implementation. Can be overridden by arch if necessary.
 */
R
Ryan Desfosses 已提交
1112 1113
void __weak pci_adjust_legacy_attr(struct pci_bus *b,
				   enum pci_mmap_state mmap_type)
1114 1115 1116
{
}

1117 1118 1119 1120 1121 1122 1123 1124
/**
 * pci_create_legacy_files - create legacy I/O port and memory files
 * @b: bus to create files under
 *
 * Some platforms allow access to legacy I/O port and ISA memory space on
 * a per-bus basis.  This routine creates the files and ties them into
 * their associated read, write and mmap files from pci-sysfs.c
 *
L
Lucas De Marchi 已提交
1125
 * On error unwind, but don't propagate the error to the caller
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
 * as it is ok to set up the PCI bus without these files.
 */
void pci_create_legacy_files(struct pci_bus *b)
{
	int error;

	b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
			       GFP_ATOMIC);
	if (!b->legacy_io)
		goto kzalloc_err;

1137
	sysfs_bin_attr_init(b->legacy_io);
1138 1139 1140 1141 1142 1143
	b->legacy_io->attr.name = "legacy_io";
	b->legacy_io->size = 0xffff;
	b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
	b->legacy_io->read = pci_read_legacy_io;
	b->legacy_io->write = pci_write_legacy_io;
	b->legacy_io->mmap = pci_mmap_legacy_io;
1144
	pci_adjust_legacy_attr(b, pci_mmap_io);
1145 1146 1147 1148 1149 1150
	error = device_create_bin_file(&b->dev, b->legacy_io);
	if (error)
		goto legacy_io_err;

	/* Allocated above after the legacy_io struct */
	b->legacy_mem = b->legacy_io + 1;
1151
	sysfs_bin_attr_init(b->legacy_mem);
1152 1153 1154 1155
	b->legacy_mem->attr.name = "legacy_mem";
	b->legacy_mem->size = 1024*1024;
	b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
	b->legacy_mem->mmap = pci_mmap_legacy_mem;
1156
	pci_adjust_legacy_attr(b, pci_mmap_mem);
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	error = device_create_bin_file(&b->dev, b->legacy_mem);
	if (error)
		goto legacy_mem_err;

	return;

legacy_mem_err:
	device_remove_bin_file(&b->dev, b->legacy_io);
legacy_io_err:
	kfree(b->legacy_io);
	b->legacy_io = NULL;
kzalloc_err:
1169
	printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
	return;
}

void pci_remove_legacy_files(struct pci_bus *b)
{
	if (b->legacy_io) {
		device_remove_bin_file(&b->dev, b->legacy_io);
		device_remove_bin_file(&b->dev, b->legacy_mem);
		kfree(b->legacy_io); /* both are allocated here */
	}
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1180 1181 1182
}
#endif /* HAVE_PCI_LEGACY */

1183
#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1184

1185 1186
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
		  enum pci_mmap_api mmap_api)
1187
{
1188 1189
	unsigned long nr, start, size;
	resource_size_t pci_start = 0, pci_end;
1190

1191 1192
	if (pci_resource_len(pdev, resno) == 0)
		return 0;
1193
	nr = vma_pages(vma);
1194
	start = vma->vm_pgoff;
1195
	size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1196 1197 1198 1199 1200
	if (mmap_api == PCI_MMAP_PROCFS) {
		pci_resource_to_user(pdev, resno, &pdev->resource[resno],
				     &pci_start, &pci_end);
		pci_start >>= PAGE_SHIFT;
	}
1201 1202
	if (start >= pci_start && start < pci_start + size &&
			start + nr <= pci_start + size)
1203 1204 1205 1206
		return 1;
	return 0;
}

L
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1207 1208 1209 1210 1211
/**
 * pci_mmap_resource - map a PCI resource into user memory space
 * @kobj: kobject for mapping
 * @attr: struct bin_attribute for the file being mapped
 * @vma: struct vm_area_struct passed into the mmap
1212
 * @write_combine: 1 for write_combine mapping
L
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1213 1214 1215
 *
 * Use the regular PCI mapping routines to map a PCI resource into userspace.
 */
R
Ryan Desfosses 已提交
1216 1217
static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
			     struct vm_area_struct *vma, int write_combine)
L
Linus Torvalds 已提交
1218
{
1219
	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1220
	int bar = (unsigned long)attr->private;
L
Linus Torvalds 已提交
1221
	enum pci_mmap_state mmap_type;
1222
	struct resource *res = &pdev->resource[bar];
1223

1224 1225 1226
	if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
		return -EINVAL;

1227
	if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1228
		return -EINVAL;
1229

L
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1230
	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1231 1232

	return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1233 1234
}

R
Ryan Desfosses 已提交
1235 1236 1237
static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
				struct bin_attribute *attr,
				struct vm_area_struct *vma)
1238 1239 1240 1241
{
	return pci_mmap_resource(kobj, attr, vma, 0);
}

R
Ryan Desfosses 已提交
1242 1243 1244
static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
				struct bin_attribute *attr,
				struct vm_area_struct *vma)
1245 1246
{
	return pci_mmap_resource(kobj, attr, vma, 1);
L
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1247 1248
}

R
Ryan Desfosses 已提交
1249 1250 1251
static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
			       struct bin_attribute *attr, char *buf,
			       loff_t off, size_t count, bool write)
1252
{
1253
	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1254
	int bar = (unsigned long)attr->private;
1255 1256
	unsigned long port = off;

1257
	port += pci_resource_start(pdev, bar);
1258

1259
	if (port > pci_resource_end(pdev, bar))
1260 1261
		return 0;

1262
	if (port + count - 1 > pci_resource_end(pdev, bar))
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
		return -EINVAL;

	switch (count) {
	case 1:
		if (write)
			outb(*(u8 *)buf, port);
		else
			*(u8 *)buf = inb(port);
		return 1;
	case 2:
		if (write)
			outw(*(u16 *)buf, port);
		else
			*(u16 *)buf = inw(port);
		return 2;
	case 4:
		if (write)
			outl(*(u32 *)buf, port);
		else
			*(u32 *)buf = inl(port);
		return 4;
	}
	return -EINVAL;
}

R
Ryan Desfosses 已提交
1288 1289 1290
static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
				    struct bin_attribute *attr, char *buf,
				    loff_t off, size_t count)
1291 1292 1293 1294
{
	return pci_resource_io(filp, kobj, attr, buf, off, count, false);
}

R
Ryan Desfosses 已提交
1295 1296 1297
static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
				     struct bin_attribute *attr, char *buf,
				     loff_t off, size_t count)
1298 1299 1300 1301
{
	return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}

1302 1303
/**
 * pci_remove_resource_files - cleanup resource files
1304
 * @pdev: dev to cleanup
1305
 *
1306
 * If we created resource files for @pdev, remove them from sysfs and
1307 1308
 * free their resources.
 */
R
Ryan Desfosses 已提交
1309
static void pci_remove_resource_files(struct pci_dev *pdev)
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
{
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		struct bin_attribute *res_attr;

		res_attr = pdev->res_attr[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}
1321 1322 1323 1324 1325 1326

		res_attr = pdev->res_attr_wc[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}
1327 1328 1329
	}
}

1330 1331 1332 1333 1334
static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
{
	/* allocate attribute structure, piggyback attribute name */
	int name_len = write_combine ? 13 : 10;
	struct bin_attribute *res_attr;
1335
	char *res_attr_name;
1336 1337 1338
	int retval;

	res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
	if (!res_attr)
		return -ENOMEM;

	res_attr_name = (char *)(res_attr + 1);

	sysfs_bin_attr_init(res_attr);
	if (write_combine) {
		pdev->res_attr_wc[num] = res_attr;
		sprintf(res_attr_name, "resource%d_wc", num);
		res_attr->mmap = pci_mmap_resource_wc;
	} else {
		pdev->res_attr[num] = res_attr;
		sprintf(res_attr_name, "resource%d", num);
1352 1353 1354 1355 1356 1357 1358 1359
		if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
			res_attr->read = pci_read_resource_io;
			res_attr->write = pci_write_resource_io;
			if (arch_can_pci_mmap_io())
				res_attr->mmap = pci_mmap_resource_uc;
		} else {
			res_attr->mmap = pci_mmap_resource_uc;
		}
1360 1361 1362 1363
	}
	res_attr->attr.name = res_attr_name;
	res_attr->attr.mode = S_IRUSR | S_IWUSR;
	res_attr->size = pci_resource_len(pdev, num);
1364
	res_attr->private = (void *)(unsigned long)num;
1365 1366 1367
	retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
	if (retval)
		kfree(res_attr);
1368 1369 1370 1371

	return retval;
}

L
Linus Torvalds 已提交
1372 1373
/**
 * pci_create_resource_files - create resource files in sysfs for @dev
1374
 * @pdev: dev in question
L
Linus Torvalds 已提交
1375
 *
1376
 * Walk the resources in @pdev creating files for each resource available.
L
Linus Torvalds 已提交
1377
 */
1378
static int pci_create_resource_files(struct pci_dev *pdev)
L
Linus Torvalds 已提交
1379 1380
{
	int i;
1381
	int retval;
L
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1382 1383 1384 1385 1386 1387 1388 1389

	/* Expose the PCI resources from this device as files */
	for (i = 0; i < PCI_ROM_RESOURCE; i++) {

		/* skip empty resources */
		if (!pci_resource_len(pdev, i))
			continue;

1390 1391
		retval = pci_create_attr(pdev, i, 0);
		/* for prefetchable resources, create a WC mappable file */
1392 1393
		if (!retval && arch_can_pci_mmap_wc() &&
		    pdev->resource[i].flags & IORESOURCE_PREFETCH)
1394 1395 1396 1397
			retval = pci_create_attr(pdev, i, 1);
		if (retval) {
			pci_remove_resource_files(pdev);
			return retval;
L
Linus Torvalds 已提交
1398 1399
		}
	}
1400
	return 0;
L
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1401 1402
}
#else /* !HAVE_PCI_MMAP */
1403 1404
int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
L
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1405 1406 1407 1408
#endif /* HAVE_PCI_MMAP */

/**
 * pci_write_rom - used to enable access to the PCI ROM display
1409
 * @filp: sysfs file
L
Linus Torvalds 已提交
1410
 * @kobj: kernel object handle
1411
 * @bin_attr: struct bin_attribute for this file
L
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1412 1413 1414 1415 1416 1417
 * @buf: user input
 * @off: file offset
 * @count: number of byte in input
 *
 * writing anything except 0 enables it
 */
R
Ryan Desfosses 已提交
1418 1419 1420
static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
			     struct bin_attribute *bin_attr, char *buf,
			     loff_t off, size_t count)
L
Linus Torvalds 已提交
1421
{
1422
	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
L
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1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433

	if ((off ==  0) && (*buf == '0') && (count == 2))
		pdev->rom_attr_enabled = 0;
	else
		pdev->rom_attr_enabled = 1;

	return count;
}

/**
 * pci_read_rom - read a PCI ROM
1434
 * @filp: sysfs file
L
Linus Torvalds 已提交
1435
 * @kobj: kernel object handle
1436
 * @bin_attr: struct bin_attribute for this file
L
Linus Torvalds 已提交
1437 1438 1439 1440 1441 1442 1443
 * @buf: where to put the data we read from the ROM
 * @off: file offset
 * @count: number of bytes to read
 *
 * Put @count bytes starting at @off into @buf from the ROM in the PCI
 * device corresponding to @kobj.
 */
R
Ryan Desfosses 已提交
1444 1445 1446
static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
			    struct bin_attribute *bin_attr, char *buf,
			    loff_t off, size_t count)
L
Linus Torvalds 已提交
1447
{
1448
	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
L
Linus Torvalds 已提交
1449 1450 1451 1452 1453
	void __iomem *rom;
	size_t size;

	if (!pdev->rom_attr_enabled)
		return -EINVAL;
1454

L
Linus Torvalds 已提交
1455
	rom = pci_map_rom(pdev, &size);	/* size starts out as PCI window size */
1456 1457
	if (!rom || !size)
		return -EIO;
1458

L
Linus Torvalds 已提交
1459 1460 1461 1462 1463
	if (off >= size)
		count = 0;
	else {
		if (off + count > size)
			count = size - off;
1464

L
Linus Torvalds 已提交
1465 1466 1467
		memcpy_fromio(buf, rom + off, count);
	}
	pci_unmap_rom(pdev, rom);
1468

L
Linus Torvalds 已提交
1469 1470 1471
	return count;
}

1472
static const struct bin_attribute pci_config_attr = {
L
Linus Torvalds 已提交
1473 1474 1475 1476
	.attr =	{
		.name = "config",
		.mode = S_IRUGO | S_IWUSR,
	},
1477
	.size = PCI_CFG_SPACE_SIZE,
L
Linus Torvalds 已提交
1478 1479 1480 1481
	.read = pci_read_config,
	.write = pci_write_config,
};

1482
static const struct bin_attribute pcie_config_attr = {
L
Linus Torvalds 已提交
1483 1484 1485 1486
	.attr =	{
		.name = "config",
		.mode = S_IRUGO | S_IWUSR,
	},
1487
	.size = PCI_CFG_SPACE_EXP_SIZE,
L
Linus Torvalds 已提交
1488 1489 1490 1491
	.read = pci_read_config,
	.write = pci_write_config,
};

R
Ryan Desfosses 已提交
1492 1493
static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
1494 1495 1496
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned long val;
1497
	ssize_t result = kstrtoul(buf, 0, &val);
1498 1499 1500 1501 1502 1503

	if (result < 0)
		return result;

	if (val != 1)
		return -EINVAL;
1504 1505 1506 1507 1508 1509

	result = pci_reset_function(pdev);
	if (result < 0)
		return result;

	return count;
1510 1511 1512 1513
}

static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
static int pci_create_capabilities_sysfs(struct pci_dev *dev)
{
	int retval;
	struct bin_attribute *attr;

	/* If the device has VPD, try to expose it in sysfs. */
	if (dev->vpd) {
		attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
		if (!attr)
			return -ENOMEM;

1525
		sysfs_bin_attr_init(attr);
1526
		attr->size = 0;
1527 1528
		attr->attr.name = "vpd";
		attr->attr.mode = S_IRUSR | S_IWUSR;
1529 1530
		attr->read = read_vpd_attr;
		attr->write = write_vpd_attr;
1531 1532
		retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
		if (retval) {
1533
			kfree(attr);
1534 1535 1536 1537 1538 1539 1540 1541
			return retval;
		}
		dev->vpd->attr = attr;
	}

	/* Active State Power Management */
	pcie_aspm_create_sysfs_dev_files(dev);

1542 1543 1544 1545 1546 1547
	if (!pci_probe_reset_function(dev)) {
		retval = device_create_file(&dev->dev, &reset_attr);
		if (retval)
			goto error;
		dev->reset_fn = 1;
	}
1548
	return 0;
1549 1550 1551 1552 1553 1554 1555 1556 1557

error:
	pcie_aspm_remove_sysfs_dev_files(dev);
	if (dev->vpd && dev->vpd->attr) {
		sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
		kfree(dev->vpd->attr);
	}

	return retval;
1558 1559
}

R
Ryan Desfosses 已提交
1560
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
L
Linus Torvalds 已提交
1561
{
1562
	int retval;
1563
	int rom_size;
1564
	struct bin_attribute *attr;
1565

L
Linus Torvalds 已提交
1566 1567 1568
	if (!sysfs_initialized)
		return -EACCES;

1569
	if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1570
		retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1571 1572
	else
		retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1573 1574
	if (retval)
		goto err;
L
Linus Torvalds 已提交
1575

1576 1577
	retval = pci_create_resource_files(pdev);
	if (retval)
1578 1579
		goto err_config_file;

L
Linus Torvalds 已提交
1580
	/* If the device has a ROM, try to expose it in sysfs. */
1581
	rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1582
	if (rom_size) {
1583
		attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1584
		if (!attr) {
1585
			retval = -ENOMEM;
1586
			goto err_resource_files;
L
Linus Torvalds 已提交
1587
		}
1588
		sysfs_bin_attr_init(attr);
1589 1590
		attr->size = rom_size;
		attr->attr.name = "rom";
1591
		attr->attr.mode = S_IRUSR | S_IWUSR;
1592 1593 1594 1595 1596 1597 1598 1599
		attr->read = pci_read_rom;
		attr->write = pci_write_rom;
		retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
		if (retval) {
			kfree(attr);
			goto err_resource_files;
		}
		pdev->rom_attr = attr;
L
Linus Torvalds 已提交
1600
	}
1601 1602 1603 1604

	/* add sysfs entries for various capabilities */
	retval = pci_create_capabilities_sysfs(pdev);
	if (retval)
1605
		goto err_rom_file;
1606

1607 1608
	pci_create_firmware_label_files(pdev);

L
Linus Torvalds 已提交
1609
	return 0;
1610

1611
err_rom_file:
1612
	if (pdev->rom_attr) {
1613
		sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1614 1615 1616
		kfree(pdev->rom_attr);
		pdev->rom_attr = NULL;
	}
1617 1618
err_resource_files:
	pci_remove_resource_files(pdev);
1619
err_config_file:
1620
	if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1621
		sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1622 1623
	else
		sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1624 1625
err:
	return retval;
L
Linus Torvalds 已提交
1626 1627
}

1628 1629 1630 1631 1632 1633 1634 1635
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
{
	if (dev->vpd && dev->vpd->attr) {
		sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
		kfree(dev->vpd->attr);
	}

	pcie_aspm_remove_sysfs_dev_files(dev);
1636 1637 1638 1639
	if (dev->reset_fn) {
		device_remove_file(&dev->dev, &reset_attr);
		dev->reset_fn = 0;
	}
1640 1641
}

L
Linus Torvalds 已提交
1642 1643 1644 1645 1646 1647 1648 1649
/**
 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 * @pdev: device whose entries we should free
 *
 * Cleanup when @pdev is removed from sysfs.
 */
void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
{
1650 1651 1652
	if (!sysfs_initialized)
		return;

1653
	pci_remove_capabilities_sysfs(pdev);
1654

1655
	if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
L
Linus Torvalds 已提交
1656
		sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1657 1658
	else
		sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
L
Linus Torvalds 已提交
1659 1660 1661

	pci_remove_resource_files(pdev);

1662
	if (pdev->rom_attr) {
1663 1664
		sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
		kfree(pdev->rom_attr);
1665
		pdev->rom_attr = NULL;
L
Linus Torvalds 已提交
1666
	}
1667 1668

	pci_remove_firmware_label_files(pdev);
L
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1669 1670 1671 1672 1673
}

static int __init pci_sysfs_init(void)
{
	struct pci_dev *pdev = NULL;
1674 1675
	int retval;

L
Linus Torvalds 已提交
1676
	sysfs_initialized = 1;
1677 1678
	for_each_pci_dev(pdev) {
		retval = pci_create_sysfs_dev_files(pdev);
1679 1680
		if (retval) {
			pci_dev_put(pdev);
1681
			return retval;
1682
		}
1683
	}
L
Linus Torvalds 已提交
1684 1685 1686

	return 0;
}
1687
late_initcall(pci_sysfs_init);
1688 1689

static struct attribute *pci_dev_dev_attrs[] = {
1690
	&vga_attr.attr,
1691 1692 1693 1694
	NULL,
};

static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
R
Ryan Desfosses 已提交
1695
					 struct attribute *a, int n)
1696
{
1697
	struct device *dev = kobj_to_dev(kobj);
1698 1699 1700 1701 1702 1703
	struct pci_dev *pdev = to_pci_dev(dev);

	if (a == &vga_attr.attr)
		if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
			return 0;

1704 1705 1706
	return a->mode;
}

1707 1708 1709 1710 1711 1712 1713
static struct attribute *pci_dev_hp_attrs[] = {
	&dev_remove_attr.attr,
	&dev_rescan_attr.attr,
	NULL,
};

static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
R
Ryan Desfosses 已提交
1714
					    struct attribute *a, int n)
1715
{
1716
	struct device *dev = kobj_to_dev(kobj);
1717 1718 1719 1720 1721 1722 1723 1724
	struct pci_dev *pdev = to_pci_dev(dev);

	if (pdev->is_virtfn)
		return 0;

	return a->mode;
}

1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
					    struct attribute *a, int n)
{
	struct device *dev = kobj_to_dev(kobj);
	struct pci_dev *pdev = to_pci_dev(dev);

	if (pci_is_bridge(pdev))
		return a->mode;

	return 0;
}

static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
					  struct attribute *a, int n)
{
	struct device *dev = kobj_to_dev(kobj);
	struct pci_dev *pdev = to_pci_dev(dev);

	if (pci_is_pcie(pdev))
		return a->mode;

	return 0;
}

static const struct attribute_group pci_dev_group = {
	.attrs = pci_dev_attrs,
};

const struct attribute_group *pci_dev_groups[] = {
	&pci_dev_group,
	NULL,
};

static const struct attribute_group pci_bridge_group = {
	.attrs = pci_bridge_attrs,
};

const struct attribute_group *pci_bridge_groups[] = {
	&pci_bridge_group,
	NULL,
};

static const struct attribute_group pcie_dev_group = {
	.attrs = pcie_dev_attrs,
};

const struct attribute_group *pcie_dev_groups[] = {
	&pcie_dev_group,
	NULL,
};

1776
static const struct attribute_group pci_dev_hp_attr_group = {
1777 1778 1779 1780
	.attrs = pci_dev_hp_attrs,
	.is_visible = pci_dev_hp_attrs_are_visible,
};

1781 1782 1783 1784
#ifdef CONFIG_PCI_IOV
static struct attribute *sriov_dev_attrs[] = {
	&sriov_totalvfs_attr.attr,
	&sriov_numvfs_attr.attr,
1785 1786 1787
	&sriov_offset_attr.attr,
	&sriov_stride_attr.attr,
	&sriov_vf_device_attr.attr,
1788
	&sriov_drivers_autoprobe_attr.attr,
1789 1790 1791 1792
	NULL,
};

static umode_t sriov_attrs_are_visible(struct kobject *kobj,
R
Ryan Desfosses 已提交
1793
				       struct attribute *a, int n)
1794
{
1795
	struct device *dev = kobj_to_dev(kobj);
1796 1797 1798 1799 1800 1801 1802

	if (!dev_is_pf(dev))
		return 0;

	return a->mode;
}

1803
static const struct attribute_group sriov_dev_attr_group = {
1804 1805 1806 1807 1808
	.attrs = sriov_dev_attrs,
	.is_visible = sriov_attrs_are_visible,
};
#endif /* CONFIG_PCI_IOV */

1809
static const struct attribute_group pci_dev_attr_group = {
1810 1811 1812 1813
	.attrs = pci_dev_dev_attrs,
	.is_visible = pci_dev_attrs_are_visible,
};

1814
static const struct attribute_group pci_bridge_attr_group = {
1815 1816 1817 1818
	.attrs = pci_bridge_attrs,
	.is_visible = pci_bridge_attrs_are_visible,
};

1819
static const struct attribute_group pcie_dev_attr_group = {
1820 1821 1822 1823
	.attrs = pcie_dev_attrs,
	.is_visible = pcie_dev_attrs_are_visible,
};

1824 1825
static const struct attribute_group *pci_dev_attr_groups[] = {
	&pci_dev_attr_group,
1826
	&pci_dev_hp_attr_group,
1827 1828 1829
#ifdef CONFIG_PCI_IOV
	&sriov_dev_attr_group,
#endif
1830 1831
	&pci_bridge_attr_group,
	&pcie_dev_attr_group,
1832 1833 1834
	NULL,
};

1835
const struct device_type pci_dev_type = {
1836 1837
	.groups = pci_dev_attr_groups,
};
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