LXR linux/drivers/vfio/vfio_spapr

   1/*
   2 * EEH functionality support for VFIO devices. The feature is only
   3 * available on sPAPR compatible platforms.
   4 *
   5 * Copyright Gavin Shan, IBM Corporation 2014.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/uaccess.h>
  14#include <linux/vfio.h>
  15#include <asm/eeh.h>
  16
  17#define DRIVER_VERSION  "0.1"
  18#define DRIVER_AUTHOR   "Gavin Shan, IBM Corporation"
  19#define DRIVER_DESC     "VFIO IOMMU SPAPR EEH"
  20
  21/* We might build address mapping here for "fast" path later */
  22void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
  23{
  24        eeh_dev_open(pdev);
  25}
  26EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
  27
  28void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
  29{
  30        eeh_dev_release(pdev);
  31}
  32EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
  33
  34long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
  35                                unsigned int cmd, unsigned long arg)
  36{
  37        struct eeh_pe *pe;
  38        struct vfio_eeh_pe_op op;
  39        unsigned long minsz;
  40        long ret = -EINVAL;
  41
  42        switch (cmd) {
  43        case VFIO_CHECK_EXTENSION:
  44                if (arg == VFIO_EEH)
  45                        ret = eeh_enabled() ? 1 : 0;
  46                else
  47                        ret = 0;
  48                break;
  49        case VFIO_EEH_PE_OP:
  50                pe = eeh_iommu_group_to_pe(group);
  51                if (!pe)
  52                        return -ENODEV;
  53
  54                minsz = offsetofend(struct vfio_eeh_pe_op, op);
  55                if (copy_from_user(&op, (void __user *)arg, minsz))
  56                        return -EFAULT;
  57                if (op.argsz < minsz || op.flags)
  58                        return -EINVAL;
  59
  60                switch (op.op) {
  61                case VFIO_EEH_PE_DISABLE:
  62                        ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
  63                        break;
  64                case VFIO_EEH_PE_ENABLE:
  65                        ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
  66                        break;
  67                case VFIO_EEH_PE_UNFREEZE_IO:
  68                        ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
  69                        break;
  70                case VFIO_EEH_PE_UNFREEZE_DMA:
  71                        ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
  72                        break;
  73                case VFIO_EEH_PE_GET_STATE:
  74                        ret = eeh_pe_get_state(pe);
  75                        break;
  76                case VFIO_EEH_PE_RESET_DEACTIVATE:
  77                        ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
  78                        break;
  79                case VFIO_EEH_PE_RESET_HOT:
  80                        ret = eeh_pe_reset(pe, EEH_RESET_HOT);
  81                        break;
  82                case VFIO_EEH_PE_RESET_FUNDAMENTAL:
  83                        ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
  84                        break;
  85                case VFIO_EEH_PE_CONFIGURE:
  86                        ret = eeh_pe_configure(pe);
  87                        break;
  88                case VFIO_EEH_PE_INJECT_ERR:
  89                        minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
  90                        if (op.argsz < minsz)
  91                                return -EINVAL;
  92                        if (copy_from_user(&op, (void __user *)arg, minsz))
  93                                return -EFAULT;
  94
  95                        ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
  96                                                op.err.addr, op.err.mask);
  97                        break;
  98                default:
  99                        ret = -EINVAL;
 100                }
 101        }
 102
 103        return ret;
 104}
 105EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
 106
 107MODULE_VERSION(DRIVER_VERSION);
 108MODULE_LICENSE("GPL v2");
 109MODULE_AUTHOR(DRIVER_AUTHOR);
 110MODULE_DESCRIPTION(DRIVER_DESC);
 111