drivers/vfio/vfio_spapr_eeh.c

   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/uaccess.h>
  13 #include <linux/vfio.h>
  14 #include <asm/eeh.h>
  15
  16 /* We might build address mapping here for "fast" path later */
  17 int vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
  18 {
  19         return eeh_dev_open(pdev);
  20 }
  21 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
  22
  23 void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
  24 {
  25         eeh_dev_release(pdev);
  26 }
  27 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
  28
  29 long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
  30                                 unsigned int cmd, unsigned long arg)
  31 {
  32         struct eeh_pe *pe;
  33         struct vfio_eeh_pe_op op;
  34         unsigned long minsz;
  35         long ret = -EINVAL;
  36
  37         switch (cmd) {
  38         case VFIO_CHECK_EXTENSION:
  39                 if (arg == VFIO_EEH)
  40                         ret = eeh_enabled() ? 1 : 0;
  41                 else
  42                         ret = 0;
  43                 break;
  44         case VFIO_EEH_PE_OP:
  45                 pe = eeh_iommu_group_to_pe(group);
  46                 if (!pe)
  47                         return -ENODEV;
  48
  49                 minsz = offsetofend(struct vfio_eeh_pe_op, op);
  50                 if (copy_from_user(&op, (void __user *)arg, minsz))
  51                         return -EFAULT;
  52                 if (op.argsz < minsz || op.flags)
  53                         return -EINVAL;
  54
  55                 switch (op.op) {
  56                 case VFIO_EEH_PE_DISABLE:
  57                         ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
  58                         break;
  59                 case VFIO_EEH_PE_ENABLE:
  60                         ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
  61                         break;
  62                 case VFIO_EEH_PE_UNFREEZE_IO:
  63                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
  64                         break;
  65                 case VFIO_EEH_PE_UNFREEZE_DMA:
  66                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
  67                         break;
  68                 case VFIO_EEH_PE_GET_STATE:
  69                         ret = eeh_pe_get_state(pe);
  70                         break;
  71                 case VFIO_EEH_PE_RESET_DEACTIVATE:
  72                         ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
  73                         break;
  74                 case VFIO_EEH_PE_RESET_HOT:
  75                         ret = eeh_pe_reset(pe, EEH_RESET_HOT);
  76                         break;
  77                 case VFIO_EEH_PE_RESET_FUNDAMENTAL:
  78                         ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
  79                         break;
  80                 case VFIO_EEH_PE_CONFIGURE:
  81                         ret = eeh_pe_configure(pe);
  82                         break;
  83                 default:
  84                         ret = -EINVAL;
  85                 }
  86         }
  87
  88         return ret;
  89 }
  90 EXPORT_SYMBOL(vfio_spapr_iommu_eeh_ioctl);