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
22 MODULE_AUTHOR("IBM Corporation");
23 MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
24 MODULE_LICENSE("GPL v2");
25
26 struct ap_matrix_dev *matrix_dev;
27 debug_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 */
32 static 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
46 static 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
vfio_ap_matrix_dev_release(struct device * dev)55 static 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
matrix_bus_match(struct device * dev,struct device_driver * drv)62 static int matrix_bus_match(struct device *dev, struct device_driver *drv)
63 {
64 return 1;
65 }
66
67 static struct bus_type matrix_bus = {
68 .name = "matrix",
69 .match = &matrix_bus_match,
70 };
71
72 static struct device_driver matrix_driver = {
73 .name = "vfio_ap",
74 .bus = &matrix_bus,
75 .suppress_bind_attrs = true,
76 };
77
vfio_ap_matrix_dev_create(void)78 static 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
124 matrix_drv_err:
125 device_unregister(&matrix_dev->device);
126 matrix_reg_err:
127 put_device(&matrix_dev->device);
128 matrix_alloc_err:
129 bus_unregister(&matrix_bus);
130 bus_register_err:
131 root_device_unregister(root_device);
132 return ret;
133 }
134
vfio_ap_matrix_dev_destroy(void)135 static 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
vfio_ap_dbf_info_init(void)145 static 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
vfio_ap_init(void)159 static 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
vfio_ap_exit(void)192 static 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
200 module_init(vfio_ap_init);
201 module_exit(vfio_ap_exit);
202