1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright IBM Corp. 2001, 2018 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/init.h> 15 #include <linux/err.h> 16 #include <linux/delay.h> 17 #include <linux/slab.h> 18 #include <linux/atomic.h> 19 #include <linux/uaccess.h> 20 #include <linux/mod_devicetable.h> 21 22 #include "ap_bus.h" 23 #include "zcrypt_api.h" 24 #include "zcrypt_error.h" 25 #include "zcrypt_msgtype6.h" 26 #include "zcrypt_cex2c.h" 27 #include "zcrypt_cca_key.h" 28 29 #define CEX2C_MIN_MOD_SIZE 16 /* 128 bits */ 30 #define CEX2C_MAX_MOD_SIZE 256 /* 2048 bits */ 31 #define CEX3C_MIN_MOD_SIZE 16 /* 128 bits */ 32 #define CEX3C_MAX_MOD_SIZE 512 /* 4096 bits */ 33 #define CEX2C_MAX_XCRB_MESSAGE_SIZE (12*1024) 34 #define CEX2C_CLEANUP_TIME (15*HZ) 35 36 MODULE_AUTHOR("IBM Corporation"); 37 MODULE_DESCRIPTION("CEX2C/CEX3C Cryptographic Coprocessor device driver, " \ 38 "Copyright IBM Corp. 2001, 2018"); 39 MODULE_LICENSE("GPL"); 40 41 static struct ap_device_id zcrypt_cex2c_card_ids[] = { 42 { .dev_type = AP_DEVICE_TYPE_CEX2C, 43 .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, 44 { .dev_type = AP_DEVICE_TYPE_CEX3C, 45 .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, 46 { /* end of list */ }, 47 }; 48 49 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_card_ids); 50 51 static struct ap_device_id zcrypt_cex2c_queue_ids[] = { 52 { .dev_type = AP_DEVICE_TYPE_CEX2C, 53 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 54 { .dev_type = AP_DEVICE_TYPE_CEX3C, 55 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 56 { /* end of list */ }, 57 }; 58 59 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_queue_ids); 60 61 /** 62 * Large random number detection function. Its sends a message to a CEX2C/CEX3C 63 * card to find out if large random numbers are supported. 64 * @ap_dev: pointer to the AP device. 65 * 66 * Returns 1 if large random numbers are supported, 0 if not and < 0 on error. 67 */ 68 static int zcrypt_cex2c_rng_supported(struct ap_queue *aq) 69 { 70 struct ap_message ap_msg; 71 unsigned long long psmid; 72 unsigned int domain; 73 struct { 74 struct type86_hdr hdr; 75 struct type86_fmt2_ext fmt2; 76 struct CPRBX cprbx; 77 } __packed *reply; 78 struct { 79 struct type6_hdr hdr; 80 struct CPRBX cprbx; 81 char function_code[2]; 82 short int rule_length; 83 char rule[8]; 84 short int verb_length; 85 short int key_length; 86 } __packed *msg; 87 int rc, i; 88 89 ap_init_message(&ap_msg); 90 ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL); 91 if (!ap_msg.message) 92 return -ENOMEM; 93 94 rng_type6CPRB_msgX(&ap_msg, 4, &domain); 95 96 msg = ap_msg.message; 97 msg->cprbx.domain = AP_QID_QUEUE(aq->qid); 98 99 rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.message, 100 ap_msg.length); 101 if (rc) 102 goto out_free; 103 104 /* Wait for the test message to complete. */ 105 for (i = 0; i < 2 * HZ; i++) { 106 msleep(1000 / HZ); 107 rc = ap_recv(aq->qid, &psmid, ap_msg.message, 4096); 108 if (rc == 0 && psmid == 0x0102030405060708ULL) 109 break; 110 } 111 112 if (i >= 2 * HZ) { 113 /* Got no answer. */ 114 rc = -ENODEV; 115 goto out_free; 116 } 117 118 reply = ap_msg.message; 119 if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0) 120 rc = 1; 121 else 122 rc = 0; 123 out_free: 124 free_page((unsigned long) ap_msg.message); 125 return rc; 126 } 127 128 /** 129 * Probe function for CEX2C/CEX3C card devices. It always accepts the 130 * AP device since the bus_match already checked the hardware type. 131 * @ap_dev: pointer to the AP card device. 132 */ 133 static int zcrypt_cex2c_card_probe(struct ap_device *ap_dev) 134 { 135 /* 136 * Normalized speed ratings per crypto adapter 137 * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY 138 */ 139 static const int CEX2C_SPEED_IDX[] = { 140 1000, 1400, 2400, 1100, 1500, 2600, 100, 12}; 141 static const int CEX3C_SPEED_IDX[] = { 142 500, 700, 1400, 550, 800, 1500, 80, 10}; 143 144 struct ap_card *ac = to_ap_card(&ap_dev->device); 145 struct zcrypt_card *zc; 146 int rc = 0; 147 148 zc = zcrypt_card_alloc(); 149 if (!zc) 150 return -ENOMEM; 151 zc->card = ac; 152 ac->private = zc; 153 switch (ac->ap_dev.device_type) { 154 case AP_DEVICE_TYPE_CEX2C: 155 zc->user_space_type = ZCRYPT_CEX2C; 156 zc->type_string = "CEX2C"; 157 memcpy(zc->speed_rating, CEX2C_SPEED_IDX, 158 sizeof(CEX2C_SPEED_IDX)); 159 zc->min_mod_size = CEX2C_MIN_MOD_SIZE; 160 zc->max_mod_size = CEX2C_MAX_MOD_SIZE; 161 zc->max_exp_bit_length = CEX2C_MAX_MOD_SIZE; 162 break; 163 case AP_DEVICE_TYPE_CEX3C: 164 zc->user_space_type = ZCRYPT_CEX3C; 165 zc->type_string = "CEX3C"; 166 memcpy(zc->speed_rating, CEX3C_SPEED_IDX, 167 sizeof(CEX3C_SPEED_IDX)); 168 zc->min_mod_size = CEX3C_MIN_MOD_SIZE; 169 zc->max_mod_size = CEX3C_MAX_MOD_SIZE; 170 zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE; 171 break; 172 default: 173 zcrypt_card_free(zc); 174 return -ENODEV; 175 } 176 zc->online = 1; 177 178 rc = zcrypt_card_register(zc); 179 if (rc) { 180 ac->private = NULL; 181 zcrypt_card_free(zc); 182 } 183 184 return rc; 185 } 186 187 /** 188 * This is called to remove the CEX2C/CEX3C card driver information 189 * if an AP card device is removed. 190 */ 191 static void zcrypt_cex2c_card_remove(struct ap_device *ap_dev) 192 { 193 struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; 194 195 if (zc) 196 zcrypt_card_unregister(zc); 197 } 198 199 static struct ap_driver zcrypt_cex2c_card_driver = { 200 .probe = zcrypt_cex2c_card_probe, 201 .remove = zcrypt_cex2c_card_remove, 202 .ids = zcrypt_cex2c_card_ids, 203 .flags = AP_DRIVER_FLAG_DEFAULT, 204 }; 205 206 /** 207 * Probe function for CEX2C/CEX3C queue devices. It always accepts the 208 * AP device since the bus_match already checked the hardware type. 209 * @ap_dev: pointer to the AP card device. 210 */ 211 static int zcrypt_cex2c_queue_probe(struct ap_device *ap_dev) 212 { 213 struct ap_queue *aq = to_ap_queue(&ap_dev->device); 214 struct zcrypt_queue *zq; 215 int rc; 216 217 zq = zcrypt_queue_alloc(CEX2C_MAX_XCRB_MESSAGE_SIZE); 218 if (!zq) 219 return -ENOMEM; 220 zq->queue = aq; 221 zq->online = 1; 222 atomic_set(&zq->load, 0); 223 rc = zcrypt_cex2c_rng_supported(aq); 224 if (rc < 0) { 225 zcrypt_queue_free(zq); 226 return rc; 227 } 228 if (rc) 229 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, 230 MSGTYPE06_VARIANT_DEFAULT); 231 else 232 zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, 233 MSGTYPE06_VARIANT_NORNG); 234 ap_queue_init_reply(aq, &zq->reply); 235 aq->request_timeout = CEX2C_CLEANUP_TIME; 236 aq->private = zq; 237 rc = zcrypt_queue_register(zq); 238 if (rc) { 239 aq->private = NULL; 240 zcrypt_queue_free(zq); 241 } 242 return rc; 243 } 244 245 /** 246 * This is called to remove the CEX2C/CEX3C queue driver information 247 * if an AP queue device is removed. 248 */ 249 static void zcrypt_cex2c_queue_remove(struct ap_device *ap_dev) 250 { 251 struct ap_queue *aq = to_ap_queue(&ap_dev->device); 252 struct zcrypt_queue *zq = aq->private; 253 254 if (zq) 255 zcrypt_queue_unregister(zq); 256 } 257 258 static struct ap_driver zcrypt_cex2c_queue_driver = { 259 .probe = zcrypt_cex2c_queue_probe, 260 .remove = zcrypt_cex2c_queue_remove, 261 .suspend = ap_queue_suspend, 262 .resume = ap_queue_resume, 263 .ids = zcrypt_cex2c_queue_ids, 264 .flags = AP_DRIVER_FLAG_DEFAULT, 265 }; 266 267 int __init zcrypt_cex2c_init(void) 268 { 269 int rc; 270 271 rc = ap_driver_register(&zcrypt_cex2c_card_driver, 272 THIS_MODULE, "cex2card"); 273 if (rc) 274 return rc; 275 276 rc = ap_driver_register(&zcrypt_cex2c_queue_driver, 277 THIS_MODULE, "cex2cqueue"); 278 if (rc) 279 ap_driver_unregister(&zcrypt_cex2c_card_driver); 280 281 return rc; 282 } 283 284 void zcrypt_cex2c_exit(void) 285 { 286 ap_driver_unregister(&zcrypt_cex2c_queue_driver); 287 ap_driver_unregister(&zcrypt_cex2c_card_driver); 288 } 289 290 module_init(zcrypt_cex2c_init); 291 module_exit(zcrypt_cex2c_exit); 292