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d85abf4c TK |
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 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/mod_devicetable.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/string.h> | |
14 | #include "vfio_ap_private.h" | |
15 | ||
16 | #define VFIO_AP_ROOT_NAME "vfio_ap" | |
17 | #define VFIO_AP_DEV_TYPE_NAME "ap_matrix" | |
18 | #define VFIO_AP_DEV_NAME "matrix" | |
19 | ||
20 | MODULE_AUTHOR("IBM Corporation"); | |
21 | MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018"); | |
22 | MODULE_LICENSE("GPL v2"); | |
23 | ||
24 | static struct ap_driver vfio_ap_drv; | |
25 | ||
26 | static struct device_type vfio_ap_dev_type = { | |
27 | .name = VFIO_AP_DEV_TYPE_NAME, | |
28 | }; | |
29 | ||
30 | struct ap_matrix_dev *matrix_dev; | |
31 | ||
32 | /* Only type 10 adapters (CEX4 and later) are supported | |
33 | * by the AP matrix device driver | |
34 | */ | |
35 | static struct ap_device_id ap_queue_ids[] = { | |
36 | { .dev_type = AP_DEVICE_TYPE_CEX4, | |
37 | .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, | |
38 | { .dev_type = AP_DEVICE_TYPE_CEX5, | |
39 | .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, | |
40 | { .dev_type = AP_DEVICE_TYPE_CEX6, | |
41 | .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, | |
42 | { /* end of sibling */ }, | |
43 | }; | |
44 | ||
45 | MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids); | |
46 | ||
47 | static int vfio_ap_queue_dev_probe(struct ap_device *apdev) | |
48 | { | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static void vfio_ap_queue_dev_remove(struct ap_device *apdev) | |
53 | { | |
54 | /* Nothing to do yet */ | |
55 | } | |
56 | ||
57 | static void vfio_ap_matrix_dev_release(struct device *dev) | |
58 | { | |
59 | struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev); | |
60 | ||
61 | kfree(matrix_dev); | |
62 | } | |
63 | ||
64 | static int vfio_ap_matrix_dev_create(void) | |
65 | { | |
66 | int ret; | |
67 | struct device *root_device; | |
68 | ||
69 | root_device = root_device_register(VFIO_AP_ROOT_NAME); | |
70 | if (IS_ERR(root_device)) | |
71 | return PTR_ERR(root_device); | |
72 | ||
73 | matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL); | |
74 | if (!matrix_dev) { | |
75 | ret = -ENOMEM; | |
76 | goto matrix_alloc_err; | |
77 | } | |
78 | ||
8a7bf355 TK |
79 | /* Fill in config info via PQAP(QCI), if available */ |
80 | if (test_facility(12)) { | |
81 | ret = ap_qci(&matrix_dev->info); | |
82 | if (ret) | |
83 | goto matrix_alloc_err; | |
84 | } | |
85 | ||
86 | mutex_init(&matrix_dev->lock); | |
87 | INIT_LIST_HEAD(&matrix_dev->mdev_list); | |
88 | ||
d85abf4c TK |
89 | matrix_dev->device.type = &vfio_ap_dev_type; |
90 | dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME); | |
91 | matrix_dev->device.parent = root_device; | |
92 | matrix_dev->device.release = vfio_ap_matrix_dev_release; | |
93 | matrix_dev->device.driver = &vfio_ap_drv.driver; | |
94 | ||
95 | ret = device_register(&matrix_dev->device); | |
96 | if (ret) | |
97 | goto matrix_reg_err; | |
98 | ||
99 | return 0; | |
100 | ||
101 | matrix_reg_err: | |
102 | put_device(&matrix_dev->device); | |
103 | matrix_alloc_err: | |
104 | root_device_unregister(root_device); | |
105 | ||
106 | return ret; | |
107 | } | |
108 | ||
109 | static void vfio_ap_matrix_dev_destroy(void) | |
110 | { | |
111 | device_unregister(&matrix_dev->device); | |
112 | root_device_unregister(matrix_dev->device.parent); | |
113 | } | |
114 | ||
115 | int __init vfio_ap_init(void) | |
116 | { | |
117 | int ret; | |
118 | ||
119 | /* If there are no AP instructions, there is nothing to pass through. */ | |
120 | if (!ap_instructions_available()) | |
121 | return -ENODEV; | |
122 | ||
123 | ret = vfio_ap_matrix_dev_create(); | |
124 | if (ret) | |
125 | return ret; | |
126 | ||
127 | memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv)); | |
128 | vfio_ap_drv.probe = vfio_ap_queue_dev_probe; | |
129 | vfio_ap_drv.remove = vfio_ap_queue_dev_remove; | |
130 | vfio_ap_drv.ids = ap_queue_ids; | |
131 | ||
132 | ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); | |
133 | if (ret) { | |
134 | vfio_ap_matrix_dev_destroy(); | |
135 | return ret; | |
136 | } | |
137 | ||
8a7bf355 TK |
138 | ret = vfio_ap_mdev_register(); |
139 | if (ret) { | |
140 | ap_driver_unregister(&vfio_ap_drv); | |
141 | vfio_ap_matrix_dev_destroy(); | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
d85abf4c TK |
146 | return 0; |
147 | } | |
148 | ||
149 | void __exit vfio_ap_exit(void) | |
150 | { | |
8a7bf355 | 151 | vfio_ap_mdev_unregister(); |
d85abf4c TK |
152 | ap_driver_unregister(&vfio_ap_drv); |
153 | vfio_ap_matrix_dev_destroy(); | |
154 | } | |
155 | ||
156 | module_init(vfio_ap_init); | |
157 | module_exit(vfio_ap_exit); |