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

// SPDX-License-Identifier: GPL-2.0
/*
 * (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/slab.h>
#include <linux/vgaarb.h>
#include <linux/pm_runtime.h>
#include <linux/msi.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 sysfs_emit(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(revision, "0x%02x\n");
pci_config_attr(class, "0x%06x\n");

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

#ifdef CONFIG_PCI_MSI
	/*
	 * For MSI, show the first MSI IRQ; for all other cases including
	 * MSI-X, show the legacy INTx IRQ.
	 */
	if (pdev->msi_enabled)
		return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
#endif

	return sysfs_emit(buf, "%u\n", pdev->irq);
}
static DEVICE_ATTR_RO(irq);

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 sysfs_emit(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
	if (dev_to_node(dev) == NUMA_NO_NODE)
		mask = cpu_online_mask;
	else
		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);

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

	return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
}
static DEVICE_ATTR_RO(power_state);

/* 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);
	int i;
	int max;
	resource_size_t start, end;
	size_t len = 0;

	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);
		len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
				     (unsigned long long)start,
				     (unsigned long long)end,
				     (unsigned long long)res->flags);
	}
	return len;
}
static DEVICE_ATTR_RO(resource);

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

	return sysfs_emit(buf, "%s\n",
			  pci_speed_string(pcie_get_speed_cap(pdev)));
}
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 *pdev = to_pci_dev(dev);

	return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
}
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;
	enum pci_bus_speed speed;

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

	speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];

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

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

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

	return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
			  pci_dev->vendor, pci_dev->device,
			  pci_dev->subsystem_vendor, pci_dev->