1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * VFIO based AP device driver
4 *
5 * Copyright IBM Corp. 2018
6 *
7 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
8 * Pierre Morel <pmorel@linux.ibm.com>
9 */
10
11#include <linux/module.h>
12#include <linux/mod_devicetable.h>
13#include <linux/slab.h>
14#include <linux/string.h>
15#include <asm/facility.h>
16#include "vfio_ap_private.h"
17#include "vfio_ap_debug.h"
18
19#define VFIO_AP_ROOT_NAME "vfio_ap"
20#define VFIO_AP_DEV_NAME "matrix"
21
22MODULE_AUTHOR("IBM Corporation");
23MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
24MODULE_LICENSE("GPL v2");
25
26struct ap_matrix_dev *matrix_dev;
27debug_info_t *vfio_ap_dbf_info;
28
29/* Only type 10 adapters (CEX4 and later) are supported
30 * by the AP matrix device driver
31 */
32static struct ap_device_id ap_queue_ids[] = {
33 { .dev_type = AP_DEVICE_TYPE_CEX4,
34 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
35 { .dev_type = AP_DEVICE_TYPE_CEX5,
36 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
37 { .dev_type = AP_DEVICE_TYPE_CEX6,
38 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
39 { .dev_type = AP_DEVICE_TYPE_CEX7,
40 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
41 { .dev_type = AP_DEVICE_TYPE_CEX8,
42 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
43 { /* end of sibling */ },
44};
45
46static struct ap_driver vfio_ap_drv = {
47 .probe = vfio_ap_mdev_probe_queue,
48 .remove = vfio_ap_mdev_remove_queue,
49 .in_use = vfio_ap_mdev_resource_in_use,
50 .on_config_changed = vfio_ap_on_cfg_changed,
51 .on_scan_complete = vfio_ap_on_scan_complete,
52 .ids = ap_queue_ids,
53};
54
55static void vfio_ap_matrix_dev_release(struct device *dev)
56{
57 struct ap_matrix_dev *matrix_dev;
58
59 matrix_dev = container_of(dev, struct ap_matrix_dev, device);
60 kfree(objp: matrix_dev);
61}
62
63static struct bus_type matrix_bus = {
64 .name = "matrix",
65};
66
67static struct device_driver matrix_driver = {
68 .name = "vfio_ap",
69 .bus = &matrix_bus,
70 .suppress_bind_attrs = true,
71};
72
73static int vfio_ap_matrix_dev_create(void)
74{
75 int ret;
76 struct device *root_device;
77
78 root_device = root_device_register(VFIO_AP_ROOT_NAME);
79 if (IS_ERR(ptr: root_device))
80 return PTR_ERR(ptr: root_device);
81
82 ret = bus_register(bus: &matrix_bus);
83 if (ret)
84 goto bus_register_err;
85
86 matrix_dev = kzalloc(size: sizeof(*matrix_dev), GFP_KERNEL);
87 if (!matrix_dev) {
88 ret = -ENOMEM;
89 goto matrix_alloc_err;
90 }
91
92 /* Fill in config info via PQAP(QCI), if available */
93 if (test_facility(12)) {
94 ret = ap_qci(&matrix_dev->info);
95 if (ret)
96 goto matrix_alloc_err;
97 }
98
99 mutex_init(&matrix_dev->mdevs_lock);
100 INIT_LIST_HEAD(list: &matrix_dev->mdev_list);
101 mutex_init(&matrix_dev->guests_lock);
102
103 dev_set_name(dev: &matrix_dev->device, name: "%s", VFIO_AP_DEV_NAME);
104 matrix_dev->device.parent = root_device;
105 matrix_dev->device.bus = &matrix_bus;
106 matrix_dev->device.release = vfio_ap_matrix_dev_release;
107 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
108
109 ret = device_register(dev: &matrix_dev->device);
110 if (ret)
111 goto matrix_reg_err;
112
113 ret = driver_register(drv: &matrix_driver);
114 if (ret)
115 goto matrix_drv_err;
116
117 return 0;
118
119matrix_drv_err:
120 device_del(dev: &matrix_dev->device);
121matrix_reg_err:
122 put_device(dev: &matrix_dev->device);
123matrix_alloc_err:
124 bus_unregister(bus: &matrix_bus);
125bus_register_err:
126 root_device_unregister(root: root_device);
127 return ret;
128}
129
130static void vfio_ap_matrix_dev_destroy(void)
131{
132 struct device *root_device = matrix_dev->device.parent;
133
134 driver_unregister(drv: &matrix_driver);
135 device_unregister(dev: &matrix_dev->device);
136 bus_unregister(bus: &matrix_bus);
137 root_device_unregister(root: root_device);
138}
139
140static int __init vfio_ap_dbf_info_init(void)
141{
142 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
143 DBF_MAX_SPRINTF_ARGS * sizeof(long));
144
145 if (!vfio_ap_dbf_info)
146 return -ENOENT;
147
148 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
149 debug_set_level(vfio_ap_dbf_info, DBF_WARN);
150
151 return 0;
152}
153
154static int __init vfio_ap_init(void)
155{
156 int ret;
157
158 ret = vfio_ap_dbf_info_init();
159 if (ret)
160 return ret;
161
162 /* If there are no AP instructions, there is nothing to pass through. */
163 if (!ap_instructions_available())
164 return -ENODEV;
165
166 ret = vfio_ap_matrix_dev_create();
167 if (ret)
168 return ret;
169
170 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
171 if (ret) {
172 vfio_ap_matrix_dev_destroy();
173 return ret;
174 }
175
176 ret = vfio_ap_mdev_register();
177 if (ret) {
178 ap_driver_unregister(&vfio_ap_drv);
179 vfio_ap_matrix_dev_destroy();
180
181 return ret;
182 }
183
184 return 0;
185}
186
187static void __exit vfio_ap_exit(void)
188{
189 vfio_ap_mdev_unregister();
190 ap_driver_unregister(&vfio_ap_drv);
191 vfio_ap_matrix_dev_destroy();
192 debug_unregister(vfio_ap_dbf_info);
193}
194
195module_init(vfio_ap_init);
196module_exit(vfio_ap_exit);
197

source code of linux/drivers/s390/crypto/vfio_ap_drv.c