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 memcpy(zc->speed_rating, CEX2A_SPEED_IDX, 98 sizeof(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 memcpy(zc->speed_rating, CEX3A_SPEED_IDX, 112 sizeof(CEX3A_SPEED_IDX)); 113 zc->type_string = "CEX3A"; 114 zc->user_space_type = ZCRYPT_CEX3A; 115 } else { 116 zcrypt_card_free(zc); 117 return -ENODEV; 118 } 119 zc->online = 1; 120 121 rc = zcrypt_card_register(zc); 122 if (rc) { 123 ac->private = NULL; 124 zcrypt_card_free(zc); 125 } 126 127 return rc; 128 } 129 130 /** 131 * This is called to remove the CEX2A card driver information 132 * if an AP card device is removed. 133 */ 134 static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev) 135 { 136 struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; 137 138 if (zc) 139 zcrypt_card_unregister(zc); 140 } 141 142 static struct ap_driver zcrypt_cex2a_card_driver = { 143 .probe = zcrypt_cex2a_card_probe, 144 .remove = zcrypt_cex2a_card_remove, 145 .ids = zcrypt_cex2a_card_ids, 146 .flags = AP_DRIVER_FLAG_DEFAULT, 147 }; 148 149 /** 150 * Probe function for CEX2A queue devices. It always accepts the AP device 151 * since the bus_match already checked the queue type. 152 * @ap_dev: pointer to the AP device. 153 */ 154 static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev) 155 { 156 struct ap_queue *aq = to_ap_queue(&ap_dev->device); 157 struct zcrypt_queue *zq = NULL; 158 int rc; 159 160 switch (ap_dev->device_type) { 161 case AP_DEVICE_TYPE_CEX2A: 162 zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE); 163 if (!zq) 164 return -ENOMEM; 165 break; 166 case AP_DEVICE_TYPE_CEX3A: 167 zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE); 168 if (!zq) 169 return -ENOMEM; 170 break; 171 } 172 if (!zq) 173 return -ENODEV; 174 zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT); 175 zq->queue = aq; 176 zq->online = 1; 177 atomic_set(&zq->load, 0); 178 ap_queue_init_state(aq); 179 ap_queue_init_reply(aq, &zq->reply); 180 aq->request_timeout = CEX2A_CLEANUP_TIME, 181 aq->private = zq; 182 rc = zcrypt_queue_register(zq); 183 if (rc) { 184 aq->private = NULL; 185 zcrypt_queue_free(zq); 186 } 187 188 return rc; 189 } 190 191 /** 192 * This is called to remove the CEX2A queue driver information 193 * if an AP queue device is removed. 194 */ 195 static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev) 196 { 197 struct ap_queue *aq = to_ap_queue(&ap_dev->device); 198 struct zcrypt_queue *zq = aq->private; 199 200 if (zq) 201 zcrypt_queue_unregister(zq); 202 } 203 204 static struct ap_driver zcrypt_cex2a_queue_driver = { 205 .probe = zcrypt_cex2a_queue_probe, 206 .remove = zcrypt_cex2a_queue_remove, 207 .suspend = ap_queue_suspend, 208 .resume = ap_queue_resume, 209 .ids = zcrypt_cex2a_queue_ids, 210 .flags = AP_DRIVER_FLAG_DEFAULT, 211 }; 212 213 int __init zcrypt_cex2a_init(void) 214 { 215 int rc; 216 217 rc = ap_driver_register(&zcrypt_cex2a_card_driver, 218 THIS_MODULE, "cex2acard"); 219 if (rc) 220 return rc; 221 222 rc = ap_driver_register(&zcrypt_cex2a_queue_driver, 223 THIS_MODULE, "cex2aqueue"); 224 if (rc) 225 ap_driver_unregister(&zcrypt_cex2a_card_driver); 226 227 return rc; 228 } 229 230 void __exit zcrypt_cex2a_exit(void) 231 { 232 ap_driver_unregister(&zcrypt_cex2a_queue_driver); 233 ap_driver_unregister(&zcrypt_cex2a_card_driver); 234 } 235 236 module_init(zcrypt_cex2a_init); 237 module_exit(zcrypt_cex2a_exit); 238