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/*
* 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 */
int vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
{
return 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;
case VFIO_EEH_PE_ENABLE:
ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
break;
case VFIO_EEH_PE_UNFREEZE_IO:
ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
break;
case VFIO_EEH_PE_UNFREEZE_DMA:
ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
break;
case VFIO_EEH_PE_GET_STATE:
ret = eeh_pe_get_state(pe);
break;
case VFIO_EEH_PE_RESET_DEACTIVATE:
ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
break;
case VFIO_EEH_PE_RESET_HOT:
ret = eeh_pe_reset(pe, EEH_RESET_HOT);
break;
case VFIO_EEH_PE_RESET_FUNDAMENTAL:
ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
break;
case VFIO_EEH_PE_CONFIGURE:
ret = eeh_pe_configure(pe);
break;
default:
ret = -EINVAL;
}
}
return ret;
}
EXPORT_SYMBOL(vfio_spapr_iommu_eeh_ioctl);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
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