path: root/drivers/pci/iov.c

// SPDX-License-Identifier: GPL-2.0
/*
 * PCI Express I/O Virtualization (IOV) support
 *   Single Root IOV 1.0
 *   Address Translation Service 1.0
 *
 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/log2.h>
#include <linux/pci.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/div64.h>
#include "pci.h"

#define VIRTFN_ID_LEN	17	/* "virtfn%u\0" for 2^32 - 1 */

int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
{
	if (!dev->is_physfn)
		return -EINVAL;
	return dev->bus->number + ((dev->devfn + dev->sriov->offset +
				    dev->sriov->stride * vf_id) >> 8);
}

int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
{
	if (!dev->is_physfn)
		return -EINVAL;
	return (dev->devfn + dev->sriov->offset +
		dev->sriov->stride * vf_id) & 0xff;
}
EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn);

int pci_iov_vf_id(struct pci_dev *dev)
{
	struct pci_dev *pf;

	if (!dev->is_virtfn)
		return -EINVAL;

	pf = pci_physfn(dev);
	return (pci_dev_id(dev) - (pci_dev_id(pf) + pf->sriov->offset)) /
	       pf->sriov->stride;
}
EXPORT_SYMBOL_GPL(pci_iov_vf_id);

/**
 * pci_iov_get_pf_drvdata - Return the drvdata of a PF
 * @dev: VF pci_dev
 * @pf_driver: Device driver required to own the PF
 *
 * This must be called from a context that ensures that a VF driver is attached.
 * The value returned is invalid once the VF driver completes its remove()
 * callback.
 *
 * Locking is achieved by the driver core. A VF driver cannot be probed until
 * pci_enable_sriov() is called and pci_disable_sriov() does not return until
 * all VF drivers have completed their remove().