projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1b69be5e GS |
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 | } |