Loading...
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
18#define VFIO_AP_ROOT_NAME "vfio_ap"
19#define VFIO_AP_DEV_NAME "matrix"
20
21MODULE_AUTHOR("IBM Corporation");
22MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
23MODULE_LICENSE("GPL v2");
24
25static struct ap_driver vfio_ap_drv;
26
27struct ap_matrix_dev *matrix_dev;
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 { /* end of sibling */ },
42};
43
44MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
45
46/**
47 * vfio_ap_queue_dev_probe:
48 *
49 * Allocate a vfio_ap_queue structure and associate it
50 * with the device as driver_data.
51 */
52static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
53{
54 struct vfio_ap_queue *q;
55
56 q = kzalloc(sizeof(*q), GFP_KERNEL);
57 if (!q)
58 return -ENOMEM;
59 dev_set_drvdata(&apdev->device, q);
60 q->apqn = to_ap_queue(&apdev->device)->qid;
61 q->saved_isc = VFIO_AP_ISC_INVALID;
62 return 0;
63}
64
65/**
66 * vfio_ap_queue_dev_remove:
67 *
68 * Takes the matrix lock to avoid actions on this device while removing
69 * Free the associated vfio_ap_queue structure
70 */
71static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
72{
73 struct vfio_ap_queue *q;
74 int apid, apqi;
75
76 mutex_lock(&matrix_dev->lock);
77 q = dev_get_drvdata(&apdev->device);
78 dev_set_drvdata(&apdev->device, NULL);
79 apid = AP_QID_CARD(q->apqn);
80 apqi = AP_QID_QUEUE(q->apqn);
81 vfio_ap_mdev_reset_queue(apid, apqi, 1);
82 vfio_ap_irq_disable(q);
83 kfree(q);
84 mutex_unlock(&matrix_dev->lock);
85}
86
87static void vfio_ap_matrix_dev_release(struct device *dev)
88{
89 struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
90
91 kfree(matrix_dev);
92}
93
94static int matrix_bus_match(struct device *dev, struct device_driver *drv)
95{
96 return 1;
97}
98
99static struct bus_type matrix_bus = {
100 .name = "matrix",
101 .match = &matrix_bus_match,
102};
103
104static struct device_driver matrix_driver = {
105 .name = "vfio_ap",
106 .bus = &matrix_bus,
107 .suppress_bind_attrs = true,
108};
109
110static int vfio_ap_matrix_dev_create(void)
111{
112 int ret;
113 struct device *root_device;
114
115 root_device = root_device_register(VFIO_AP_ROOT_NAME);
116 if (IS_ERR(root_device))
117 return PTR_ERR(root_device);
118
119 ret = bus_register(&matrix_bus);
120 if (ret)
121 goto bus_register_err;
122
123 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
124 if (!matrix_dev) {
125 ret = -ENOMEM;
126 goto matrix_alloc_err;
127 }
128
129 /* Fill in config info via PQAP(QCI), if available */
130 if (test_facility(12)) {
131 ret = ap_qci(&matrix_dev->info);
132 if (ret)
133 goto matrix_alloc_err;
134 }
135
136 mutex_init(&matrix_dev->lock);
137 INIT_LIST_HEAD(&matrix_dev->mdev_list);
138
139 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
140 matrix_dev->device.parent = root_device;
141 matrix_dev->device.bus = &matrix_bus;
142 matrix_dev->device.release = vfio_ap_matrix_dev_release;
143 matrix_dev->vfio_ap_drv = &vfio_ap_drv;
144
145 ret = device_register(&matrix_dev->device);
146 if (ret)
147 goto matrix_reg_err;
148
149 ret = driver_register(&matrix_driver);
150 if (ret)
151 goto matrix_drv_err;
152
153 return 0;
154
155matrix_drv_err:
156 device_unregister(&matrix_dev->device);
157matrix_reg_err:
158 put_device(&matrix_dev->device);
159matrix_alloc_err:
160 bus_unregister(&matrix_bus);
161bus_register_err:
162 root_device_unregister(root_device);
163 return ret;
164}
165
166static void vfio_ap_matrix_dev_destroy(void)
167{
168 struct device *root_device = matrix_dev->device.parent;
169
170 driver_unregister(&matrix_driver);
171 device_unregister(&matrix_dev->device);
172 bus_unregister(&matrix_bus);
173 root_device_unregister(root_device);
174}
175
176static int __init vfio_ap_init(void)
177{
178 int ret;
179
180 /* If there are no AP instructions, there is nothing to pass through. */
181 if (!ap_instructions_available())
182 return -ENODEV;
183
184 ret = vfio_ap_matrix_dev_create();
185 if (ret)
186 return ret;
187
188 memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv));
189 vfio_ap_drv.probe = vfio_ap_queue_dev_probe;
190 vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
191 vfio_ap_drv.ids = ap_queue_ids;
192
193 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
194 if (ret) {
195 vfio_ap_matrix_dev_destroy();
196 return ret;
197 }
198
199 ret = vfio_ap_mdev_register();
200 if (ret) {
201 ap_driver_unregister(&vfio_ap_drv);
202 vfio_ap_matrix_dev_destroy();
203
204 return ret;
205 }
206
207 return 0;
208}
209
210static void __exit vfio_ap_exit(void)
211{
212 vfio_ap_mdev_unregister();
213 ap_driver_unregister(&vfio_ap_drv);
214 vfio_ap_matrix_dev_destroy();
215}
216
217module_init(vfio_ap_init);
218module_exit(vfio_ap_exit);