drivers/vfio/vfio_spapr_eeh.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * EEH functionality support for VFIO devices. The feature is only
   4  * available on sPAPR compatible platforms.
   5  *
   6  * Copyright Gavin Shan, IBM Corporation 2014.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/uaccess.h>
  11 #include <linux/vfio.h>
  12 #include <asm/eeh.h>
  13
  14 #define DRIVER_VERSION  "0.1"
  15 #define DRIVER_AUTHOR   "Gavin Shan, IBM Corporation"
  16 #define DRIVER_DESC     "VFIO IOMMU SPAPR EEH"
  17
  18 /* We might build address mapping here for "fast" path later */
  19 void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
  20 {
  21         eeh_dev_open(pdev);
  22 }
  23 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
  24
  25 void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
  26 {
  27         eeh_dev_release(pdev);
  28 }
  29 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
  30
  31 long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
  32                                 unsigned int cmd, unsigned long arg)
  33 {
  34         struct eeh_pe *pe;
  35         struct vfio_eeh_pe_op op;
  36         unsigned long minsz;
  37         long ret = -EINVAL;
  38
  39         switch (cmd) {
  40         case VFIO_CHECK_EXTENSION:
  41                 if (arg == VFIO_EEH)
  42                         ret = eeh_enabled() ? 1 : 0;
  43                 else
  44                         ret = 0;
  45                 break;
  46         case VFIO_EEH_PE_OP:
  47                 pe = eeh_iommu_group_to_pe(group);
  48                 if (!pe)
  49                         return -ENODEV;
  50
  51                 minsz = offsetofend(struct vfio_eeh_pe_op, op);
  52                 if (copy_from_user(&op, (void __user *)arg, minsz))
  53                         return -EFAULT;
  54                 if (op.argsz < minsz || op.flags)
  55                         return -EINVAL;
  56
  57                 switch (op.op) {
  58                 case VFIO_EEH_PE_DISABLE:
  59                         ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
  60                         break;
  61                 case VFIO_EEH_PE_ENABLE:
  62                         ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
  63                         break;
  64                 case VFIO_EEH_PE_UNFREEZE_IO:
  65                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
  66                         break;
  67                 case VFIO_EEH_PE_UNFREEZE_DMA:
  68                         ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
  69                         break;
  70                 case VFIO_EEH_PE_GET_STATE:
  71                         ret = eeh_pe_get_state(pe);
  72                         break;
  73                 case VFIO_EEH_PE_RESET_DEACTIVATE:
  74                         ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
  75                         break;
  76                 case VFIO_EEH_PE_RESET_HOT:
  77                         ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
  78                         break;
  79                 case VFIO_EEH_PE_RESET_FUNDAMENTAL:
  80                         ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
  81                         break;
  82                 case VFIO_EEH_PE_CONFIGURE:
  83                         ret = eeh_pe_configure(pe);
  84                         break;
  85                 case VFIO_EEH_PE_INJECT_ERR:
  86                         minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
  87                         if (op.argsz < minsz)
  88                                 return -EINVAL;
  89                         if (copy_from_user(&op, (void __user *)arg, minsz))
  90                                 return -EFAULT;
  91
  92                         ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
  93                                                 op.err.addr, op.err.mask);
  94                         break;
  95                 default:
  96                         ret = -EINVAL;
  97                 }
  98         }
  99
 100         return ret;
 101 }
 102 EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
 103
 104 MODULE_VERSION(DRIVER_VERSION);
 105 MODULE_LICENSE("GPL v2");
 106 MODULE_AUTHOR(DRIVER_AUTHOR);
 107 MODULE_DESCRIPTION(DRIVER_DESC);