linux-imx

/*

 * EEH functionality support for VFIO devices. The feature is only

 * available on sPAPR compatible platforms.

 *

 * Copyright Gavin Shan, IBM Corporation 2014.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#include <linux/module.h>

#include <linux/uaccess.h>

#include <linux/vfio.h>

#include <asm/eeh.h>

​

#define DRIVER_VERSION  "0.1"

#define DRIVER_AUTHOR   "Gavin Shan, IBM Corporation"

#define DRIVER_DESC "VFIO IOMMU SPAPR EEH"

​

/* We might build address mapping here for "fast" path later */

void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)

{

    eeh_dev_open(pdev);

}

EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);

​

void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)

{

    eeh_dev_release(pdev);

}

EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);

​

long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,

                unsigned int cmd, unsigned long arg)

{

    struct eeh_pe *pe;

    struct vfio_eeh_pe_op op;

    unsigned long minsz;

    long ret = -EINVAL;

​

    switch (cmd) {

    case VFIO_CHECK_EXTENSION:

        if (arg == VFIO_EEH)

            ret = eeh_enabled() ? 1 : 0;

        else

            ret = 0;

        break;

    case VFIO_EEH_PE_OP:

        pe = eeh_iommu_group_to_pe(group);

        if (!pe)

            return -ENODEV;

​

        minsz = offsetofend(struct vfio_eeh_pe_op, op);

        if (copy_from_user(&op, (void __user *)arg, minsz))

            return -EFAULT;

        if (op.argsz < minsz || op.flags)

            return -EINVAL;

​

        switch (op.op) {

        case VFIO_EEH_PE_DISABLE:

            ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);

            break;