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 */
39 #define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg)
40
41 #define CEX2A_CLEANUP_TIME (15 * HZ)
42 #define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME
43
44 MODULE_AUTHOR("IBM Corporation");
45 MODULE_DESCRIPTION("CEX2A/CEX3A Cryptographic Coprocessor device driver, " \
46 "Copyright IBM Corp. 2001, 2018");
47 MODULE_LICENSE("GPL");
48
49 static struct ap_device_id zcrypt_cex2a_card_ids[] = {
50 { .dev_type = AP_DEVICE_TYPE_CEX2A,
51 .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
52 { .dev_type = AP_DEVICE_TYPE_CEX3A,
53 .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
54 { /* end of list */ },
55 };
56
57 MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids);
58
59 static struct ap_device_id zcrypt_cex2a_queue_ids[] = {
60 { .dev_type = AP_DEVICE_TYPE_CEX2A,
61 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
62 { .dev_type = AP_DEVICE_TYPE_CEX3A,
63 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
64 { /* end of list */ },
65 };
66
67 MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids);
68
69 /*
70 * Probe function for CEX2A card devices. It always accepts the AP device
71 * since the bus_match already checked the card type.
72 * @ap_dev: pointer to the AP device.
73 */
zcrypt_cex2a_card_probe(struct ap_device * ap_dev)74 static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev)
75 {
76 /*
77 * Normalized speed ratings per crypto adapter
78 * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
79 */
80 static const int CEX2A_SPEED_IDX[] = {
81 800, 1000, 2000, 900, 1200, 2400, 0, 0};
82 static const int CEX3A_SPEED_IDX[] = {
83 400, 500, 1000, 450, 550, 1200, 0, 0};
84
85 struct ap_card *ac = to_ap_card(&ap_dev->device);
86 struct zcrypt_card *zc;
87 int rc = 0;
88
89 zc = zcrypt_card_alloc();
90 if (!zc)
91 return -ENOMEM;
92 zc->card = ac;
93 dev_set_drvdata(&ap_dev->device, zc);
94
95 if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) {
96 zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
97 zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
98 zc->speed_rating = CEX2A_SPEED_IDX;
99 zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
100 zc->type_string = "CEX2A";
101 zc->user_space_type = ZCRYPT_CEX2A;
102 } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) {
103 zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
104 zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
105 zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
106 if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
107 ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
108 zc->max_mod_size = CEX3A_MAX_MOD_SIZE;
109 zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
110 }
111 zc->speed_rating = CEX3A_SPEED_IDX;
112 zc->type_string = "CEX3A";
113 zc->user_space_type = ZCRYPT_CEX3A;
114 } else {
115 zcrypt_card_free(zc);
116 return -ENODEV;
117 }
118 zc->online = 1;
119
120 rc = zcrypt_card_register(zc);
121 if (rc)
122 zcrypt_card_free(zc);
123
124 return rc;
125 }
126
127 /*
128 * This is called to remove the CEX2A card driver information
129 * if an AP card device is removed.
130 */
zcrypt_cex2a_card_remove(struct ap_device * ap_dev)131 static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev)
132 {
133 struct zcrypt_card *zc = dev_get_drvdata(&ap_dev->device);
134
135 zcrypt_card_unregister(zc);
136 }
137
138 static struct ap_driver zcrypt_cex2a_card_driver = {
139 .probe = zcrypt_cex2a_card_probe,
140 .remove = zcrypt_cex2a_card_remove,
141 .ids = zcrypt_cex2a_card_ids,
142 .flags = AP_DRIVER_FLAG_DEFAULT,
143 };
144
145 /*
146 * Probe function for CEX2A queue devices. It always accepts the AP device
147 * since the bus_match already checked the queue type.
148 * @ap_dev: pointer to the AP device.
149 */
zcrypt_cex2a_queue_probe(struct ap_device * ap_dev)150 static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev)
151 {
152 struct ap_queue *aq = to_ap_queue(&ap_dev->device);
153 struct zcrypt_queue *zq = NULL;
154 int rc;
155
156 switch (ap_dev->device_type) {
157 case AP_DEVICE_TYPE_CEX2A:
158 zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE);
159 if (!zq)
160 return -ENOMEM;
161 break;
162 case AP_DEVICE_TYPE_CEX3A:
163 zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE);
164 if (!zq)
165 return -ENOMEM;
166 break;
167 }
168 if (!zq)
169 return -ENODEV;
170 zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT);
171 zq->queue = aq;
172 zq->online = 1;
173 atomic_set(&zq->load, 0);
174 ap_queue_init_state(aq);
175 ap_queue_init_reply(aq, &zq->reply);
176 aq->request_timeout = CEX2A_CLEANUP_TIME;
177 dev_set_drvdata(&ap_dev->device, zq);
178 rc = zcrypt_queue_register(zq);
179 if (rc)
180 zcrypt_queue_free(zq);
181
182 return rc;
183 }
184
185 /*
186 * This is called to remove the CEX2A queue driver information
187 * if an AP queue device is removed.
188 */
zcrypt_cex2a_queue_remove(struct ap_device * ap_dev)189 static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev)
190 {
191 struct zcrypt_queue *zq = dev_get_drvdata(&ap_dev->device);
192
193 zcrypt_queue_unregister(zq);
194 }
195
196 static struct ap_driver zcrypt_cex2a_queue_driver = {
197 .probe = zcrypt_cex2a_queue_probe,
198 .remove = zcrypt_cex2a_queue_remove,
199 .ids = zcrypt_cex2a_queue_ids,
200 .flags = AP_DRIVER_FLAG_DEFAULT,
201 };
202
zcrypt_cex2a_init(void)203 int __init zcrypt_cex2a_init(void)
204 {
205 int rc;
206
207 rc = ap_driver_register(&zcrypt_cex2a_card_driver,
208 THIS_MODULE, "cex2acard");
209 if (rc)
210 return rc;
211
212 rc = ap_driver_register(&zcrypt_cex2a_queue_driver,
213 THIS_MODULE, "cex2aqueue");
214 if (rc)
215 ap_driver_unregister(&zcrypt_cex2a_card_driver);
216
217 return rc;
218 }
219
zcrypt_cex2a_exit(void)220 void __exit zcrypt_cex2a_exit(void)
221 {
222 ap_driver_unregister(&zcrypt_cex2a_queue_driver);
223 ap_driver_unregister(&zcrypt_cex2a_card_driver);
224 }
225
226 module_init(zcrypt_cex2a_init);
227 module_exit(zcrypt_cex2a_exit);
228