1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
#include "lm.h"
#include "vfio_dev.h"
struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
{
return pds_vfio->vfio_coredev.pdev;
}
struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio)
{
return &pds_vfio_to_pci_dev(pds_vfio)->dev;
}
struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
{
struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);
return container_of(core_device, struct pds_vfio_pci_device,
vfio_coredev);
}
static void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio)
{
again:
spin_lock(&pds_vfio->reset_lock);
if (pds_vfio->deferred_reset) {
pds_vfio->deferred_reset = false;
if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) {
pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
}
spin_unlock(&pds_vfio->reset_lock);
goto again;
}
mutex_unlock(&pds_vfio->state_mutex);
spin_unlock(&pds_vfio->reset_lock);
}
void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio)
{
spin_lock(&pds_vfio->reset_lock);
pds_vfio->deferred_reset = true;
if (!mutex_trylock(&pds_vfio->state_mutex)) {
spin_unlock(&pds_vfio->reset_lock);
return;
}
spin_unlock(&pds_vfio->reset_lock);
pds_vfio_state_mutex_unlock(pds_vfio);
}
static struct file *
pds_vfio_set_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state new_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
struct file *res = NULL;
mutex_lock(&pds_vfio->state_mutex);
while (new_state != pds_vfio->state) {
enum vfio_device_mig_state next_state;
int err = vfio_mig_get_next_state(vdev, pds_vfio->state,
new_state, &next_state);
if (err) {
res = ERR_PTR(err);
break;
}
res = pds_vfio_step_device_state_locked(pds_vfio, next_state);
if (IS_ERR(res))
break;
pds_vfio->state = next_state;
if (WARN_ON(res && new_state != pds_vfio->state)) {
res = ERR_PTR(-EINVAL);
break;
}
}
pds_vfio_state_mutex_unlock(pds_vfio);
return res;
}
static int pds_vfio_get_device_state(struct vfio_device *vdev,
enum vfio_device_mig_state *current_state)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
*current_state = pds_vfio->state;
pds_vfio_state_mutex_unlock(pds_vfio);
return 0;
}
static int pds_vfio_get_device_state_size(struct vfio_device *vdev,
unsigned long *stop_copy_length)
{
*stop_copy_length = PDS_LM_DEVICE_STATE_LENGTH;
return 0;
}
static const struct vfio_migration_ops pds_vfio_lm_ops = {
.migration_set_state = pds_vfio_set_device_state,
.migration_get_state = pds_vfio_get_device_state,
.migration_get_data_size = pds_vfio_get_device_state_size
};
static int pds_vfio_init_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
struct pci_dev *pdev = to_pci_dev(vdev->dev);
int err, vf_id, pci_id;
vf_id = pci_iov_vf_id(pdev);
if (vf_id < 0)
return vf_id;
err = vfio_pci_core_init_dev(vdev);
if (err)
return err;
pds_vfio->vf_id = vf_id;
vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
vdev->mig_ops = &pds_vfio_lm_ops;
pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
dev_dbg(&pdev->dev,
"%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n",
__func__, pci_dev_id(pdev->physfn), pci_id, vf_id,
pci_domain_nr(pdev->bus), pds_vfio);
return 0;
}
static int pds_vfio_open_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
int err;
err = vfio_pci_core_enable(&pds_vfio->vfio_coredev);
if (err)
return err;
mutex_init(&pds_vfio->state_mutex);
pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);
return 0;
}
static void pds_vfio_close_device(struct vfio_device *vdev)
{
struct pds_vfio_pci_device *pds_vfio =
container_of(vdev, struct pds_vfio_pci_device,
vfio_coredev.vdev);
mutex_lock(&pds_vfio->state_mutex);
pds_vfio_put_restore_file(pds_vfio);
pds_vfio_put_save_file(pds_vfio);
mutex_unlock(&pds_vfio->state_mutex);
mutex_destroy(&pds_vfio->state_mutex);
vfio_pci_core_close_device(vdev);
}
static const struct vfio_device_ops pds_vfio_ops = {
.name = "pds-vfio",
.init = pds_vfio_init_device,
.release = vfio_pci_core_release_dev,
.open_device = pds_vfio_open_device,
.close_device = pds_vfio_close_device,
.ioctl = vfio_pci_core_ioctl,
.device_feature = vfio_pci_core_ioctl_feature,
.read = vfio_pci_core_read,
.write = vfio_pci_core_write,
.mmap = vfio_pci_core_mmap,
.request = vfio_pci_core_request,
.match = vfio_pci_core_match,
.bind_iommufd = vfio_iommufd_physical_bind,
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
};
const struct vfio_device_ops *pds_vfio_ops_info(void)
{
return &pds_vfio_ops;
}
|
