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
  22 void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
  23 {
  24         eeh_dev_release(pdev);
  25 }
  26
  27 long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
  28                                 unsigned int cmd, unsigned long arg)
  29 {
  30         struct eeh_pe *pe;
  31         struct vfio_eeh_pe_op op;
  32         unsigned long minsz;
  33         long ret = -EINVAL;
  34
  35         switch (cmd) {
  36         case VFIO_CHECK_EXTENSION:
  37                 if (arg == VFIO_EEH)
  38                         ret = eeh_enabled() ? 1 : 0;
  39                 else
  40                         ret = 0;
  41                 break;
  42         case VFIO_EEH_PE_OP:
  43                 pe = eeh_iommu_group_to_pe(group);
  44                 if (!pe)
  45                         return -ENODEV;
  46
  47                 minsz = offsetofend(struct vfio_eeh_pe_op, op);
  48                 if (copy_from_user(&op, (void __user *)arg, minsz))
  49                         return -EFAULT;
  50                 if (op.argsz < minsz || op.flags)
  51                         return -EINVAL;
  52
  53                 switch (op.op) {
  54                 case VFIO_EEH_PE_DISABLE:
  55                         ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
  56                         break;
  57                 case VFIO_EEH_PE_ENABLE:
  58                         ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
  59                         break;
  60                 case VFIO_EEH_PE_UNFREEZE_IO:
  61                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
  62                         break;
  63                 case VFIO_EEH_PE_UNFREEZE_DMA:
  64                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
  65                         break;
  66                 case VFIO_EEH_PE_GET_STATE:
  67                         ret = eeh_pe_get_state(pe);
  68                         break;
  69                 case VFIO_EEH_PE_RESET_DEACTIVATE:
  70                         ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
  71                         break;
  72                 case VFIO_EEH_PE_RESET_HOT:
  73                         ret = eeh_pe_reset(pe, EEH_RESET_HOT);
  74                         break;
  75                 case VFIO_EEH_PE_RESET_FUNDAMENTAL:
  76                         ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
  77                         break;
  78                 case VFIO_EEH_PE_CONFIGURE:
  79                         ret = eeh_pe_configure(pe);
  80                         break;
  81                 default:
  82                         ret = -EINVAL;
  83                 }
  84         }
  85
  86         return ret;
  87 }