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 */
vfio_spapr_pci_eeh_open(struct pci_dev * pdev)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
vfio_spapr_pci_eeh_release(struct pci_dev * pdev)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
vfio_spapr_iommu_eeh_ioctl(struct iommu_group * group,unsigned int cmd,unsigned long arg)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);
108