1 /* 2 * Copyright IBM Corp. 2012 3 * Author(s): Holger Dengler <hd@linux.vnet.ibm.com> 4 */ 5 6 #include <linux/module.h> 7 #include <linux/slab.h> 8 #include <linux/init.h> 9 #include <linux/err.h> 10 #include <linux/atomic.h> 11 #include <linux/uaccess.h> 12 13 #include "ap_bus.h" 14 #include "zcrypt_api.h" 15 #include "zcrypt_msgtype6.h" 16 #include "zcrypt_msgtype50.h" 17 #include "zcrypt_error.h" 18 #include "zcrypt_cex4.h" 19 20 #define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */ 21 #define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */ 22 #define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */ 23 24 #define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */ 25 #define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */ 26 27 #define CEX4A_SPEED_RATING 900 /* TODO new card, new speed rating */ 28 #define CEX4C_SPEED_RATING 6500 /* TODO new card, new speed rating */ 29 #define CEX4P_SPEED_RATING 7000 /* TODO new card, new speed rating */ 30 #define CEX5A_SPEED_RATING 450 /* TODO new card, new speed rating */ 31 #define CEX5C_SPEED_RATING 3250 /* TODO new card, new speed rating */ 32 #define CEX5P_SPEED_RATING 3500 /* TODO new card, new speed rating */ 33 34 #define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE 35 #define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE 36 37 /* Waiting time for requests to be processed. 38 * Currently there are some types of request which are not deterministic. 39 * But the maximum time limit managed by the stomper code is set to 60sec. 40 * Hence we have to wait at least that time period. 41 */ 42 #define CEX4_CLEANUP_TIME (900*HZ) 43 44 static struct ap_device_id zcrypt_cex4_ids[] = { 45 { AP_DEVICE(AP_DEVICE_TYPE_CEX4) }, 46 { AP_DEVICE(AP_DEVICE_TYPE_CEX5) }, 47 { /* end of list */ }, 48 }; 49 50 MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids); 51 MODULE_AUTHOR("IBM Corporation"); 52 MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \ 53 "Copyright IBM Corp. 2012"); 54 MODULE_LICENSE("GPL"); 55 56 static int zcrypt_cex4_probe(struct ap_device *ap_dev); 57 static void zcrypt_cex4_remove(struct ap_device *ap_dev); 58 59 static struct ap_driver zcrypt_cex4_driver = { 60 .probe = zcrypt_cex4_probe, 61 .remove = zcrypt_cex4_remove, 62 .ids = zcrypt_cex4_ids, 63 .request_timeout = CEX4_CLEANUP_TIME, 64 }; 65 66 /** 67 * Probe function for CEX4 cards. It always accepts the AP device 68 * since the bus_match already checked the hardware type. 69 * @ap_dev: pointer to the AP device. 70 */ 71 static int zcrypt_cex4_probe(struct ap_device *ap_dev) 72 { 73 struct zcrypt_device *zdev = NULL; 74 int rc = 0; 75 76 switch (ap_dev->device_type) { 77 case AP_DEVICE_TYPE_CEX4: 78 case AP_DEVICE_TYPE_CEX5: 79 if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) { 80 zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE); 81 if (!zdev) 82 return -ENOMEM; 83 if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) { 84 zdev->type_string = "CEX4A"; 85 zdev->speed_rating = CEX4A_SPEED_RATING; 86 } else { 87 zdev->type_string = "CEX5A"; 88 zdev->speed_rating = CEX5A_SPEED_RATING; 89 } 90 zdev->user_space_type = ZCRYPT_CEX3A; 91 zdev->min_mod_size = CEX4A_MIN_MOD_SIZE; 92 if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) && 93 ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) { 94 zdev->max_mod_size = 95 CEX4A_MAX_MOD_SIZE_4K; 96 zdev->max_exp_bit_length = 97 CEX4A_MAX_MOD_SIZE_4K; 98 } else { 99 zdev->max_mod_size = 100 CEX4A_MAX_MOD_SIZE_2K; 101 zdev->max_exp_bit_length = 102 CEX4A_MAX_MOD_SIZE_2K; 103 } 104 zdev->short_crt = 1; 105 zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME, 106 MSGTYPE50_VARIANT_DEFAULT); 107 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) { 108 zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE); 109 if (!zdev) 110 return -ENOMEM; 111 if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) { 112 zdev->type_string = "CEX4C"; 113 zdev->speed_rating = CEX4C_SPEED_RATING; 114 } else { 115 zdev->type_string = "CEX5C"; 116 zdev->speed_rating = CEX5C_SPEED_RATING; 117 } 118 zdev->user_space_type = ZCRYPT_CEX3C; 119 zdev->min_mod_size = CEX4C_MIN_MOD_SIZE; 120 zdev->max_mod_size = CEX4C_MAX_MOD_SIZE; 121 zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE; 122 zdev->short_crt = 0; 123 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME, 124 MSGTYPE06_VARIANT_DEFAULT); 125 } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) { 126 zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE); 127 if (!zdev) 128 return -ENOMEM; 129 if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) { 130 zdev->type_string = "CEX4P"; 131 zdev->speed_rating = CEX4P_SPEED_RATING; 132 } else { 133 zdev->type_string = "CEX5P"; 134 zdev->speed_rating = CEX5P_SPEED_RATING; 135 } 136 zdev->user_space_type = ZCRYPT_CEX4; 137 zdev->min_mod_size = CEX4C_MIN_MOD_SIZE; 138 zdev->max_mod_size = CEX4C_MAX_MOD_SIZE; 139 zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE; 140 zdev->short_crt = 0; 141 zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME, 142 MSGTYPE06_VARIANT_EP11); 143 } 144 break; 145 } 146 if (!zdev) 147 return -ENODEV; 148 zdev->ap_dev = ap_dev; 149 zdev->online = 1; 150 ap_dev->reply = &zdev->reply; 151 ap_dev->private = zdev; 152 rc = zcrypt_device_register(zdev); 153 if (rc) { 154 zcrypt_msgtype_release(zdev->ops); 155 ap_dev->private = NULL; 156 zcrypt_device_free(zdev); 157 } 158 return rc; 159 } 160 161 /** 162 * This is called to remove the extended CEX4 driver information 163 * if an AP device is removed. 164 */ 165 static void zcrypt_cex4_remove(struct ap_device *ap_dev) 166 { 167 struct zcrypt_device *zdev = ap_dev->private; 168 struct zcrypt_ops *zops; 169 170 if (zdev) { 171 zops = zdev->ops; 172 zcrypt_device_unregister(zdev); 173 zcrypt_msgtype_release(zops); 174 } 175 } 176 177 int __init zcrypt_cex4_init(void) 178 { 179 return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4"); 180 } 181 182 void __exit zcrypt_cex4_exit(void) 183 { 184 ap_driver_unregister(&zcrypt_cex4_driver); 185 } 186 187 module_init(zcrypt_cex4_init); 188 module_exit(zcrypt_cex4_exit); 189