1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * EEH functionality support for VFIO devices. The feature is only
4*4882a593Smuzhiyun * available on sPAPR compatible platforms.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright Gavin Shan, IBM Corporation 2014.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/uaccess.h>
11*4882a593Smuzhiyun #include <linux/vfio.h>
12*4882a593Smuzhiyun #include <asm/eeh.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define DRIVER_VERSION "0.1"
15*4882a593Smuzhiyun #define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
16*4882a593Smuzhiyun #define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /* We might build address mapping here for "fast" path later */
vfio_spapr_pci_eeh_open(struct pci_dev * pdev)19*4882a593Smuzhiyun void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun eeh_dev_open(pdev);
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
24*4882a593Smuzhiyun
vfio_spapr_pci_eeh_release(struct pci_dev * pdev)25*4882a593Smuzhiyun void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun eeh_dev_release(pdev);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_release);
30*4882a593Smuzhiyun
vfio_spapr_iommu_eeh_ioctl(struct iommu_group * group,unsigned int cmd,unsigned long arg)31*4882a593Smuzhiyun long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
32*4882a593Smuzhiyun unsigned int cmd, unsigned long arg)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct eeh_pe *pe;
35*4882a593Smuzhiyun struct vfio_eeh_pe_op op;
36*4882a593Smuzhiyun unsigned long minsz;
37*4882a593Smuzhiyun long ret = -EINVAL;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun switch (cmd) {
40*4882a593Smuzhiyun case VFIO_CHECK_EXTENSION:
41*4882a593Smuzhiyun if (arg == VFIO_EEH)
42*4882a593Smuzhiyun ret = eeh_enabled() ? 1 : 0;
43*4882a593Smuzhiyun else
44*4882a593Smuzhiyun ret = 0;
45*4882a593Smuzhiyun break;
46*4882a593Smuzhiyun case VFIO_EEH_PE_OP:
47*4882a593Smuzhiyun pe = eeh_iommu_group_to_pe(group);
48*4882a593Smuzhiyun if (!pe)
49*4882a593Smuzhiyun return -ENODEV;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun minsz = offsetofend(struct vfio_eeh_pe_op, op);
52*4882a593Smuzhiyun if (copy_from_user(&op, (void __user *)arg, minsz))
53*4882a593Smuzhiyun return -EFAULT;
54*4882a593Smuzhiyun if (op.argsz < minsz || op.flags)
55*4882a593Smuzhiyun return -EINVAL;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun switch (op.op) {
58*4882a593Smuzhiyun case VFIO_EEH_PE_DISABLE:
59*4882a593Smuzhiyun ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
60*4882a593Smuzhiyun break;
61*4882a593Smuzhiyun case VFIO_EEH_PE_ENABLE:
62*4882a593Smuzhiyun ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
63*4882a593Smuzhiyun break;
64*4882a593Smuzhiyun case VFIO_EEH_PE_UNFREEZE_IO:
65*4882a593Smuzhiyun ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
66*4882a593Smuzhiyun break;
67*4882a593Smuzhiyun case VFIO_EEH_PE_UNFREEZE_DMA:
68*4882a593Smuzhiyun ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
69*4882a593Smuzhiyun break;
70*4882a593Smuzhiyun case VFIO_EEH_PE_GET_STATE:
71*4882a593Smuzhiyun ret = eeh_pe_get_state(pe);
72*4882a593Smuzhiyun break;
73*4882a593Smuzhiyun case VFIO_EEH_PE_RESET_DEACTIVATE:
74*4882a593Smuzhiyun ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
75*4882a593Smuzhiyun break;
76*4882a593Smuzhiyun case VFIO_EEH_PE_RESET_HOT:
77*4882a593Smuzhiyun ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
78*4882a593Smuzhiyun break;
79*4882a593Smuzhiyun case VFIO_EEH_PE_RESET_FUNDAMENTAL:
80*4882a593Smuzhiyun ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
81*4882a593Smuzhiyun break;
82*4882a593Smuzhiyun case VFIO_EEH_PE_CONFIGURE:
83*4882a593Smuzhiyun ret = eeh_pe_configure(pe);
84*4882a593Smuzhiyun break;
85*4882a593Smuzhiyun case VFIO_EEH_PE_INJECT_ERR:
86*4882a593Smuzhiyun minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
87*4882a593Smuzhiyun if (op.argsz < minsz)
88*4882a593Smuzhiyun return -EINVAL;
89*4882a593Smuzhiyun if (copy_from_user(&op, (void __user *)arg, minsz))
90*4882a593Smuzhiyun return -EFAULT;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
93*4882a593Smuzhiyun op.err.addr, op.err.mask);
94*4882a593Smuzhiyun break;
95*4882a593Smuzhiyun default:
96*4882a593Smuzhiyun ret = -EINVAL;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return ret;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(vfio_spapr_iommu_eeh_ioctl);
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun MODULE_VERSION(DRIVER_VERSION);
105*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
106*4882a593Smuzhiyun MODULE_AUTHOR(DRIVER_AUTHOR);
107*4882a593Smuzhiyun MODULE_DESCRIPTION(DRIVER_DESC);
108