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1 | // SPDX-License-Identifier: GPL-2.0+ | |
2 | /* | |
3 | * Copyright IBM Corp. 2001, 2012 | |
4 | * Author(s): Robert Burroughs | |
5 | * Eric Rossman (edrossma@us.ibm.com) | |
6 | * | |
7 | * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) | |
8 | * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> | |
9 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
10 | * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/atomic.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/mod_devicetable.h> | |
20 | ||
21 | #include "ap_bus.h" | |
22 | #include "zcrypt_api.h" | |
23 | #include "zcrypt_error.h" | |
24 | #include "zcrypt_cex2a.h" | |
25 | #include "zcrypt_msgtype50.h" | |
26 | ||
27 | #define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */ | |
28 | #define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */ | |
29 | #define CEX3A_MIN_MOD_SIZE CEX2A_MIN_MOD_SIZE | |
30 | #define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */ | |
31 | ||
32 | #define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ | |
33 | #define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ | |
34 | ||
35 | #define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus | |
36 | * (max outputdatalength) + | |
37 | * type80_hdr*/ | |
38 | #define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg) | |
39 | ||
40 | #define CEX2A_CLEANUP_TIME (15*HZ) | |
41 | #define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME | |
42 | ||
43 | MODULE_AUTHOR("IBM Corporation"); | |
44 | MODULE_DESCRIPTION("CEX2A/CEX3A Cryptographic Coprocessor device driver, " \ | |
45 | "Copyright IBM Corp. 2001, 2018"); | |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | static struct ap_device_id zcrypt_cex2a_card_ids[] = { | |
49 | { .dev_type = AP_DEVICE_TYPE_CEX2A, | |
50 | .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, | |
51 | { .dev_type = AP_DEVICE_TYPE_CEX3A, | |
52 | .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, | |
53 | { /* end of list */ }, | |
54 | }; | |
55 | ||
56 | MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids); | |
57 | ||
58 | static struct ap_device_id zcrypt_cex2a_queue_ids[] = { | |
59 | { .dev_type = AP_DEVICE_TYPE_CEX2A, | |
60 | .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, | |
61 | { .dev_type = AP_DEVICE_TYPE_CEX3A, | |
62 | .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, | |
63 | { /* end of list */ }, | |
64 | }; | |
65 | ||
66 | MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids); | |
67 | ||
68 | /** | |
69 | * Probe function for CEX2A card devices. It always accepts the AP device | |
70 | * since the bus_match already checked the card type. | |
71 | * @ap_dev: pointer to the AP device. | |
72 | */ | |
73 | static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev) | |
74 | { | |
75 | /* | |
76 | * Normalized speed ratings per crypto adapter | |
77 | * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY | |
78 | */ | |
79 | static const int CEX2A_SPEED_IDX[] = { | |
80 | 800, 1000, 2000, 900, 1200, 2400, 0, 0}; | |
81 | static const int CEX3A_SPEED_IDX[] = { | |
82 | 400, 500, 1000, 450, 550, 1200, 0, 0}; | |
83 | ||
84 | struct ap_card *ac = to_ap_card(&ap_dev->device); | |
85 | struct zcrypt_card *zc; | |
86 | int rc = 0; | |
87 | ||
88 | zc = zcrypt_card_alloc(); | |
89 | if (!zc) | |
90 | return -ENOMEM; | |
91 | zc->card = ac; | |
92 | ac->private = zc; | |
93 | ||
94 | if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) { | |
95 | zc->min_mod_size = CEX2A_MIN_MOD_SIZE; | |
96 | zc->max_mod_size = CEX2A_MAX_MOD_SIZE; | |
97 | zc->speed_rating = CEX2A_SPEED_IDX; | |
98 | zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; | |
99 | zc->type_string = "CEX2A"; | |
100 | zc->user_space_type = ZCRYPT_CEX2A; | |
101 | } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) { | |
102 | zc->min_mod_size = CEX2A_MIN_MOD_SIZE; | |
103 | zc->max_mod_size = CEX2A_MAX_MOD_SIZE; | |
104 | zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; | |
105 | if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) && | |
106 | ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) { | |
107 | zc->max_mod_size = CEX3A_MAX_MOD_SIZE; | |
108 | zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE; | |
109 | } | |
110 | zc->speed_rating = CEX3A_SPEED_IDX; | |
111 | zc->type_string = "CEX3A"; | |
112 | zc->user_space_type = ZCRYPT_CEX3A; | |
113 | } else { | |
114 | zcrypt_card_free(zc); | |
115 | return -ENODEV; | |
116 | } | |
117 | zc->online = 1; | |
118 | ||
119 | rc = zcrypt_card_register(zc); | |
120 | if (rc) { | |
121 | ac->private = NULL; | |
122 | zcrypt_card_free(zc); | |
123 | } | |
124 | ||
125 | return rc; | |
126 | } | |
127 | ||
128 | /** | |
129 | * This is called to remove the CEX2A card driver information | |
130 | * if an AP card device is removed. | |
131 | */ | |
132 | static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev) | |
133 | { | |
134 | struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; | |
135 | ||
136 | if (zc) | |
137 | zcrypt_card_unregister(zc); | |
138 | } | |
139 | ||
140 | static struct ap_driver zcrypt_cex2a_card_driver = { | |
141 | .probe = zcrypt_cex2a_card_probe, | |
142 | .remove = zcrypt_cex2a_card_remove, | |
143 | .ids = zcrypt_cex2a_card_ids, | |
144 | .flags = AP_DRIVER_FLAG_DEFAULT, | |
145 | }; | |
146 | ||
147 | /** | |
148 | * Probe function for CEX2A queue devices. It always accepts the AP device | |
149 | * since the bus_match already checked the queue type. | |
150 | * @ap_dev: pointer to the AP device. | |
151 | */ | |
152 | static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev) | |
153 | { | |
154 | struct ap_queue *aq = to_ap_queue(&ap_dev->device); | |
155 | struct zcrypt_queue *zq = NULL; | |
156 | int rc; | |
157 | ||
158 | switch (ap_dev->device_type) { | |
159 | case AP_DEVICE_TYPE_CEX2A: | |
160 | zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE); | |
161 | if (!zq) | |
162 | return -ENOMEM; | |
163 | break; | |
164 | case AP_DEVICE_TYPE_CEX3A: | |
165 | zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE); | |
166 | if (!zq) | |
167 | return -ENOMEM; | |
168 | break; | |
169 | } | |
170 | if (!zq) | |
171 | return -ENODEV; | |
172 | zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT); | |
173 | zq->queue = aq; | |
174 | zq->online = 1; | |
175 | atomic_set(&zq->load, 0); | |
176 | ap_queue_init_state(aq); | |
177 | ap_queue_init_reply(aq, &zq->reply); | |
178 | aq->request_timeout = CEX2A_CLEANUP_TIME; | |
179 | aq->private = zq; | |
180 | rc = zcrypt_queue_register(zq); | |
181 | if (rc) { | |
182 | aq->private = NULL; | |
183 | zcrypt_queue_free(zq); | |
184 | } | |
185 | ||
186 | return rc; | |
187 | } | |
188 | ||
189 | /** | |
190 | * This is called to remove the CEX2A queue driver information | |
191 | * if an AP queue device is removed. | |
192 | */ | |
193 | static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev) | |
194 | { | |
195 | struct ap_queue *aq = to_ap_queue(&ap_dev->device); | |
196 | struct zcrypt_queue *zq = aq->private; | |
197 | ||
198 | if (zq) | |
199 | zcrypt_queue_unregister(zq); | |
200 | } | |
201 | ||
202 | static struct ap_driver zcrypt_cex2a_queue_driver = { | |
203 | .probe = zcrypt_cex2a_queue_probe, | |
204 | .remove = zcrypt_cex2a_queue_remove, | |
205 | .ids = zcrypt_cex2a_queue_ids, | |
206 | .flags = AP_DRIVER_FLAG_DEFAULT, | |
207 | }; | |
208 | ||
209 | int __init zcrypt_cex2a_init(void) | |
210 | { | |
211 | int rc; | |
212 | ||
213 | rc = ap_driver_register(&zcrypt_cex2a_card_driver, | |
214 | THIS_MODULE, "cex2acard"); | |
215 | if (rc) | |
216 | return rc; | |
217 | ||
218 | rc = ap_driver_register(&zcrypt_cex2a_queue_driver, | |
219 | THIS_MODULE, "cex2aqueue"); | |
220 | if (rc) | |
221 | ap_driver_unregister(&zcrypt_cex2a_card_driver); | |
222 | ||
223 | return rc; | |
224 | } | |
225 | ||
226 | void __exit zcrypt_cex2a_exit(void) | |
227 | { | |
228 | ap_driver_unregister(&zcrypt_cex2a_queue_driver); | |
229 | ap_driver_unregister(&zcrypt_cex2a_card_driver); | |
230 | } | |
231 | ||
232 | module_init(zcrypt_cex2a_init); | |
233 | module_exit(zcrypt_cex2a_exit); |