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;
58
59 matrix_dev = container_of(dev, struct ap_matrix_dev, device);
60 kfree(matrix_dev);
61 }
62
63 static struct bus_type matrix_bus = {
64 .name = "matrix",
65 };
66
67 static struct device_driver matrix_driver = {
68 .name = "vfio_ap",
69 .bus = &matrix_bus,
70 .suppress_bind_attrs = true,
71 };
72
vfio_ap_matrix_dev_create(void)73 static 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(root_device))
80 return PTR_ERR(root_device);
81
82 ret = bus_register(&matrix_bus);
83 if (ret)
84 goto bus_register_err;
85
86 matrix_dev = kzalloc(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(&matrix_dev->mdev_list);
101 mutex_init(&matrix_dev->guests_lock);
102
103 dev_set_name(&matrix_dev->device, "%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(&matrix_dev->device);
110 if (ret)
111 goto matrix_reg_err;
112
113 ret = driver_register(&matrix_driver);
114 if (ret)
115 goto matrix_drv_err;
116
117 return 0;
118
119 matrix_drv_err:
120 device_del(&matrix_dev->device);
121 matrix_reg_err:
122 put_device(&matrix_dev->device);
123 matrix_alloc_err:
124 bus_unregister(&matrix_bus);
125 bus_register_err:
126 root_device_unregister(root_device);
127 return ret;
128 }
129
vfio_ap_matrix_dev_destroy(void)130 static void vfio_ap_matrix_dev_destroy(void)
131 {
132 struct device *root_device = matrix_dev->device.parent;
133
134 driver_unregister(&matrix_driver);
135 device_unregister(&matrix_dev->device);
136 bus_unregister(&matrix_bus);
137 root_device_unregister(root_device);
138 }
139
vfio_ap_dbf_info_init(void)140 static 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
vfio_ap_init(void)154 static 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
vfio_ap_exit(void)187 static 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
195 module_init(vfio_ap_init);
196 module_exit(vfio_ap_exit);
197