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 */
19void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
20{
21	eeh_dev_open(pdev);
22}
23EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
24
25void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
26{
27	eeh_dev_release(pdev);
28}
29EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
30
31long 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}
102EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
103
104MODULE_VERSION(DRIVER_VERSION);
105MODULE_LICENSE("GPL v2");
106MODULE_AUTHOR(DRIVER_AUTHOR);
107MODULE_DESCRIPTION(DRIVER_DESC);
108