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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 = dev_get_drvdata(dev);
58
59 kfree(matrix_dev);
60}
61
62static int matrix_bus_match(struct device *dev, struct device_driver *drv)
63{
64 return 1;
65}
66
67static struct bus_type matrix_bus = {
68 .name = "matrix",
69 .match = &matrix_bus_match,
70};
71
72static struct device_driver matrix_driver = {
73 .name = "vfio_ap",
74 .bus = &matrix_bus,
75 .suppress_bind_attrs = true,
76};
77
78static int vfio_ap_matrix_dev_create(void)
79{
80 int ret;
81 struct device *root_device;
82
83 root_device = root_device_register(VFIO_AP_ROOT_NAME);
84 if (IS_ERR(root_device))
85 return PTR_ERR(root_device);
86
87 ret = bus_register(&matrix_bus);
88 if (ret)
89 goto bus_register_err;
90
91 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
92 if (!matrix_dev) {
93 ret = -ENOMEM;
94 goto matrix_alloc_err;
95 }
96
97 /* Fill in config info via PQAP(QCI), if available */
98 if (test_facility(12)) {
99 ret = ap_qci(&matrix_dev->info);
100 if (ret)
101 goto matrix_alloc_err;
102 }
103
104 mutex_init(&matrix_dev->mdevs_lock);
105 INIT_LIST_HEAD(&matrix_dev->mdev_list);
106 mutex_init(&matrix_dev->guests_lock);
107
108 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
109 matrix_dev->device.parent = root_device;
110 matrix_dev->device.bus = &matrix_bus;
111 matrix_dev->device.release = vfio_ap_matrix_dev_release;
112 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
113
114 ret = device_register(&matrix_dev->device);
115 if (ret)
116 goto matrix_reg_err;
117
118 ret = driver_register(&matrix_driver);
119 if (ret)
120 goto matrix_drv_err;
121
122 return 0;
123
124matrix_drv_err:
125 device_del(&matrix_dev->device);
126matrix_reg_err:
127 put_device(&matrix_dev->device);
128matrix_alloc_err:
129 bus_unregister(&matrix_bus);
130bus_register_err:
131 root_device_unregister(root_device);
132 return ret;
133}
134
135static void vfio_ap_matrix_dev_destroy(void)
136{
137 struct device *root_device = matrix_dev->device.parent;
138
139 driver_unregister(&matrix_driver);
140 device_unregister(&matrix_dev->device);
141 bus_unregister(&matrix_bus);
142 root_device_unregister(root_device);
143}
144
145static int __init vfio_ap_dbf_info_init(void)
146{
147 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
148 DBF_MAX_SPRINTF_ARGS * sizeof(long));
149
150 if (!vfio_ap_dbf_info)
151 return -ENOENT;
152
153 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
154 debug_set_level(vfio_ap_dbf_info, DBF_WARN);
155
156 return 0;
157}
158
159static int __init vfio_ap_init(void)
160{
161 int ret;
162
163 ret = vfio_ap_dbf_info_init();
164 if (ret)
165 return ret;
166
167 /* If there are no AP instructions, there is nothing to pass through. */
168 if (!ap_instructions_available())
169 return -ENODEV;
170
171 ret = vfio_ap_matrix_dev_create();
172 if (ret)
173 return ret;
174
175 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
176 if (ret) {
177 vfio_ap_matrix_dev_destroy();
178 return ret;
179 }
180
181 ret = vfio_ap_mdev_register();
182 if (ret) {
183 ap_driver_unregister(&vfio_ap_drv);
184 vfio_ap_matrix_dev_destroy();
185
186 return ret;
187 }
188
189 return 0;
190}
191
192static void __exit vfio_ap_exit(void)
193{
194 vfio_ap_mdev_unregister();
195 ap_driver_unregister(&vfio_ap_drv);
196 vfio_ap_matrix_dev_destroy();
197 debug_unregister(vfio_ap_dbf_info);
198}
199
200module_init(vfio_ap_init);
201module_exit(vfio_ap_exit);
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
29static ssize_t features_show(struct device *dev, struct device_attribute *attr, char *buf)
30{
31 return sysfs_emit(buf, "guest_matrix hotplug ap_config\n");
32}
33static DEVICE_ATTR_RO(features);
34
35static struct attribute *matrix_dev_attrs[] = {
36 &dev_attr_features.attr,
37 NULL,
38};
39ATTRIBUTE_GROUPS(matrix_dev);
40
41/* Only type 10 adapters (CEX4 and later) are supported
42 * by the AP matrix device driver
43 */
44static struct ap_device_id ap_queue_ids[] = {
45 { .dev_type = AP_DEVICE_TYPE_CEX4,
46 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
47 { .dev_type = AP_DEVICE_TYPE_CEX5,
48 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
49 { .dev_type = AP_DEVICE_TYPE_CEX6,
50 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
51 { .dev_type = AP_DEVICE_TYPE_CEX7,
52 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
53 { .dev_type = AP_DEVICE_TYPE_CEX8,
54 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
55 { /* end of sibling */ },
56};
57
58static struct ap_driver vfio_ap_drv = {
59 .probe = vfio_ap_mdev_probe_queue,
60 .remove = vfio_ap_mdev_remove_queue,
61 .in_use = vfio_ap_mdev_resource_in_use,
62 .on_config_changed = vfio_ap_on_cfg_changed,
63 .on_scan_complete = vfio_ap_on_scan_complete,
64 .ids = ap_queue_ids,
65};
66
67static void vfio_ap_matrix_dev_release(struct device *dev)
68{
69 struct ap_matrix_dev *matrix_dev;
70
71 matrix_dev = container_of(dev, struct ap_matrix_dev, device);
72 kfree(matrix_dev);
73}
74
75static const struct bus_type matrix_bus = {
76 .name = "matrix",
77};
78
79static struct device_driver matrix_driver = {
80 .name = "vfio_ap",
81 .bus = &matrix_bus,
82 .suppress_bind_attrs = true,
83 .dev_groups = matrix_dev_groups,
84};
85
86static int vfio_ap_matrix_dev_create(void)
87{
88 int ret;
89 struct device *root_device;
90
91 root_device = root_device_register(VFIO_AP_ROOT_NAME);
92 if (IS_ERR(root_device))
93 return PTR_ERR(root_device);
94
95 ret = bus_register(&matrix_bus);
96 if (ret)
97 goto bus_register_err;
98
99 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
100 if (!matrix_dev) {
101 ret = -ENOMEM;
102 goto matrix_alloc_err;
103 }
104
105 /* Fill in config info via PQAP(QCI), if available */
106 if (test_facility(12)) {
107 ret = ap_qci(&matrix_dev->info);
108 if (ret)
109 goto matrix_alloc_err;
110 }
111
112 mutex_init(&matrix_dev->mdevs_lock);
113 INIT_LIST_HEAD(&matrix_dev->mdev_list);
114 mutex_init(&matrix_dev->guests_lock);
115
116 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
117 matrix_dev->device.parent = root_device;
118 matrix_dev->device.bus = &matrix_bus;
119 matrix_dev->device.release = vfio_ap_matrix_dev_release;
120 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
121
122 ret = device_register(&matrix_dev->device);
123 if (ret)
124 goto matrix_reg_err;
125
126 ret = driver_register(&matrix_driver);
127 if (ret)
128 goto matrix_drv_err;
129
130 return 0;
131
132matrix_drv_err:
133 device_del(&matrix_dev->device);
134matrix_reg_err:
135 put_device(&matrix_dev->device);
136matrix_alloc_err:
137 bus_unregister(&matrix_bus);
138bus_register_err:
139 root_device_unregister(root_device);
140 return ret;
141}
142
143static void vfio_ap_matrix_dev_destroy(void)
144{
145 struct device *root_device = matrix_dev->device.parent;
146
147 driver_unregister(&matrix_driver);
148 device_unregister(&matrix_dev->device);
149 bus_unregister(&matrix_bus);
150 root_device_unregister(root_device);
151}
152
153static int __init vfio_ap_dbf_info_init(void)
154{
155 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
156 DBF_MAX_SPRINTF_ARGS * sizeof(long));
157
158 if (!vfio_ap_dbf_info)
159 return -ENOENT;
160
161 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
162 debug_set_level(vfio_ap_dbf_info, DBF_WARN);
163
164 return 0;
165}
166
167static int __init vfio_ap_init(void)
168{
169 int ret;
170
171 ret = vfio_ap_dbf_info_init();
172 if (ret)
173 return ret;
174
175 /* If there are no AP instructions, there is nothing to pass through. */
176 if (!ap_instructions_available())
177 return -ENODEV;
178
179 ret = vfio_ap_matrix_dev_create();
180 if (ret)
181 return ret;
182
183 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
184 if (ret) {
185 vfio_ap_matrix_dev_destroy();
186 return ret;
187 }
188
189 ret = vfio_ap_mdev_register();
190 if (ret) {
191 ap_driver_unregister(&vfio_ap_drv);
192 vfio_ap_matrix_dev_destroy();
193
194 return ret;
195 }
196
197 return 0;
198}
199
200static void __exit vfio_ap_exit(void)
201{
202 vfio_ap_mdev_unregister();
203 ap_driver_unregister(&vfio_ap_drv);
204 vfio_ap_matrix_dev_destroy();
205 debug_unregister(vfio_ap_dbf_info);
206}
207
208module_init(vfio_ap_init);
209module_exit(vfio_ap_exit);