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
205
206
207
208
209
210
211
212
213
214
|
// SPDX-License-Identifier: GPL-2.0+
/*
* VFIO based AP device driver
*
* Copyright IBM Corp. 2018
*
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
* Pierre Morel <pmorel@linux.ibm.com>
*/
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/facility.h>
#include "vfio_ap_private.h"
#define VFIO_AP_ROOT_NAME "vfio_ap"
#define VFIO_AP_DEV_NAME "matrix"
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
MODULE_LICENSE("GPL v2");
static struct ap_driver vfio_ap_drv;
struct ap_matrix_dev *matrix_dev;
/* Only type 10 adapters (CEX4 and later) are supported
* by the AP matrix device driver
*/
static struct ap_device_id ap_queue_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_CEX4,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX5,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX6,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX7,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ /* end of sibling */ },
};
MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
/**
* vfio_ap_queue_dev_probe:
*
* Allocate a vfio_ap_queue structure and associate it
* with the device as driver_data.
*/
static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
{
struct vfio_ap_queue *q;
q = kzalloc(sizeof(*q), GFP_KERNEL);
if (!q)
return -ENOMEM;
dev_set_drvdata(&apdev->device, q);
q->apqn = to_ap_queue(&apdev->device)->qid;
q->saved_isc = VFIO_AP_ISC_INVALID;
return 0;
}
/**
* vfio_ap_queue_dev_remove:
*
* Takes the matrix lock to avoid actions on this device while removing
* Free the associated vfio_ap_queue structure
*/
static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
{
struct vfio_ap_queue *q;
mutex_lock(&matrix_dev->lock);
q = dev_get_drvdata(&apdev->device);
vfio_ap_mdev_reset_queue(q, 1);
dev_set_drvdata(&apdev->device, NULL);
kfree(q);
mutex_unlock(&matrix_dev->lock);
}
static void vfio_ap_matrix_dev_release(struct device *dev)
{
struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
kfree(matrix_dev);
}
static int matrix_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static struct bus_type matrix_bus = {
.name = "matrix",
.match = &matrix_bus_match,
};
static struct device_driver matrix_driver = {
.name = "vfio_ap",
.bus = &matrix_bus,
.suppress_bind_attrs = true,
};
static int vfio_ap_matrix_dev_create(void)
{
int ret;
struct device *root_device;
root_device = root_device_register(VFIO_AP_ROOT_NAME);
if (IS_ERR(root_device))
return PTR_ERR(root_device);
ret = bus_register(&matrix_bus);
if (ret)
goto bus_register_err;
matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
if (!matrix_dev) {
ret = -ENOMEM;
goto matrix_alloc_err;
}
/* Fill in config info via PQAP(QCI), if available */
if (test_facility(12)) {
ret = ap_qci(&matrix_dev->info);
if (ret)
goto matrix_alloc_err;
}
mutex_init(&matrix_dev->lock);
INIT_LIST_HEAD(&matrix_dev->mdev_list);
dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
matrix_dev->device.parent = root_device;
matrix_dev->device.bus = &matrix_bus;
matrix_dev->device.release = vfio_ap_matrix_dev_release;
matrix_dev->vfio_ap_drv = &vfio_ap_drv;
ret = device_register(&matrix_dev->device);
if (ret)
goto matrix_reg_err;
ret = driver_register(&matrix_driver);
if (ret)
goto matrix_drv_err;
return 0;
matrix_drv_err:
device_unregister(&matrix_dev->device);
matrix_reg_err:
put_device(&matrix_dev->device);
matrix_alloc_err:
bus_unregister(&matrix_bus);
bus_register_err:
root_device_unregister(root_device);
return ret;
}
static void vfio_ap_matrix_dev_destroy(void)
{
struct device *root_device = matrix_dev->device.parent;
driver_unregister(&matrix_driver);
device_unregister(&matrix_dev->device);
bus_unregister(&matrix_bus);
root_device_unregister(root_device);
}
static int __init vfio_ap_init(void)
{
int ret;
/* If there are no AP instructions, there is nothing to pass through. */
if (!ap_instructions_available())
return -ENODEV;
ret = vfio_ap_matrix_dev_create();
if (ret)
return ret;
memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv));
vfio_ap_drv.probe = vfio_ap_queue_dev_probe;
vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
vfio_ap_drv.ids = ap_queue_ids;
ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
if (ret) {
vfio_ap_matrix_dev_destroy();
return ret;
}
ret = vfio_ap_mdev_register();
if (ret) {
ap_driver_unregister(&vfio_ap_drv);
vfio_ap_matrix_dev_destroy();
return ret;
}
return 0;
}
static void __exit vfio_ap_exit(void)
{
vfio_ap_mdev_unregister();
ap_driver_unregister(&vfio_ap_drv);
vfio_ap_matrix_dev_destroy();
}
module_init(vfio_ap_init);
module_exit(vfio_ap_exit);
|
