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 */
vfio_spapr_pci_eeh_open(struct pci_dev * pdev)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
vfio_spapr_pci_eeh_release(struct pci_dev * pdev)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
vfio_spapr_iommu_eeh_ioctl(struct iommu_group * group,unsigned int cmd,unsigned long arg)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);
101