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/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 */
  22 void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
  23 {
  24         eeh_dev_open(pdev);
  25 }
  26 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
  27
  28 void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
  29 {
  30         eeh_dev_release(pdev);
  31 }
  32 EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
  33
  34 long 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                 default:
  89                         ret = -EINVAL;
  90                 }
  91         }
  92
  93         return ret;
  94 }
  95 EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
  96
  97 MODULE_VERSION(DRIVER_VERSION);
  98 MODULE_LICENSE("GPL v2");
  99 MODULE_AUTHOR(DRIVER_AUTHOR);
 100 MODULE_DESCRIPTION(DRIVER_DESC);