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 */
22void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
23{
24	eeh_dev_open(pdev);
25}
26EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
27
28void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
29{
30	eeh_dev_release(pdev);
31}
32EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
33
34long 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		case VFIO_EEH_PE_INJECT_ERR:
89			minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
90			if (op.argsz < minsz)
91				return -EINVAL;
92			if (copy_from_user(&op, (void __user *)arg, minsz))
93				return -EFAULT;
94
95			ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
96						op.err.addr, op.err.mask);
97			break;
98		default:
99			ret = -EINVAL;
100		}
101	}
102
103	return ret;
104}
105EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
106
107MODULE_VERSION(DRIVER_VERSION);
108MODULE_LICENSE("GPL v2");
109MODULE_AUTHOR(DRIVER_AUTHOR);
110MODULE_DESCRIPTION(DRIVER_DESC);
111