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
features_show(struct device * dev,struct device_attribute * attr,char * buf)29 static 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 }
33 static DEVICE_ATTR_RO(features);
34
35 static struct attribute *matrix_dev_attrs[] = {
36 &dev_attr_features.attr,
37 NULL,
38 };
39 ATTRIBUTE_GROUPS(matrix_dev);
40
41 /* Only type 10 adapters (CEX4 and later) are supported
42 * by the AP matrix device driver
43 */
44 static 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
58 static 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
vfio_ap_matrix_dev_release(struct device * dev)67 static 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
75 static const struct bus_type matrix_bus = {
76 .name = "matrix",
77 };
78
79 static 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
vfio_ap_matrix_dev_create(void)86 static 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
132 matrix_drv_err:
133 device_del(&matrix_dev->device);
134 matrix_reg_err:
135 put_device(&matrix_dev->device);
136 matrix_alloc_err:
137 bus_unregister(&matrix_bus);
138 bus_register_err:
139 root_device_unregister(root_device);
140 return ret;
141 }
142
vfio_ap_matrix_dev_destroy(void)143 static 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
vfio_ap_dbf_info_init(void)153 static 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
vfio_ap_init(void)167 static 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
vfio_ap_exit(void)200 static 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
208 module_init(vfio_ap_init);
209 module_exit(vfio_ap_exit);
210