1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright IBM Corp. 2001, 2019 4 * Author(s): Robert Burroughs 5 * Eric Rossman (edrossma@us.ibm.com) 6 * Cornelia Huck <cornelia.huck@de.ibm.com> 7 * 8 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 9 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 10 * Ralph Wuerthner <rwuerthn@de.ibm.com> 11 * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> 12 */ 13 14 #ifndef _ZCRYPT_API_H_ 15 #define _ZCRYPT_API_H_ 16 17 #include <linux/atomic.h> 18 #include <asm/debug.h> 19 #include <asm/zcrypt.h> 20 #include "ap_bus.h" 21 22 /** 23 * Supported device types 24 */ 25 #define ZCRYPT_CEX2C 5 26 #define ZCRYPT_CEX2A 6 27 #define ZCRYPT_CEX3C 7 28 #define ZCRYPT_CEX3A 8 29 #define ZCRYPT_CEX4 10 30 #define ZCRYPT_CEX5 11 31 #define ZCRYPT_CEX6 12 32 #define ZCRYPT_CEX7 13 33 34 /** 35 * Large random numbers are pulled in 4096 byte chunks from the crypto cards 36 * and stored in a page. Be careful when increasing this buffer due to size 37 * limitations for AP requests. 38 */ 39 #define ZCRYPT_RNG_BUFFER_SIZE 4096 40 41 /* 42 * Identifier for Crypto Request Performance Index 43 */ 44 enum crypto_ops { 45 MEX_1K, 46 MEX_2K, 47 MEX_4K, 48 CRT_1K, 49 CRT_2K, 50 CRT_4K, 51 HWRNG, 52 SECKEY, 53 NUM_OPS 54 }; 55 56 struct zcrypt_queue; 57 58 /* struct to hold tracking information for a userspace request/response */ 59 struct zcrypt_track { 60 int again_counter; /* retry attempts counter */ 61 int last_qid; /* last qid used */ 62 int last_rc; /* last return code */ 63 }; 64 65 /* defines related to message tracking */ 66 #define TRACK_AGAIN_MAX 10 67 #define TRACK_AGAIN_CARD_WEIGHT_PENALTY 1000 68 #define TRACK_AGAIN_QUEUE_WEIGHT_PENALTY 10000 69 70 struct zcrypt_ops { 71 long (*rsa_modexpo)(struct zcrypt_queue *, struct ica_rsa_modexpo *, 72 struct ap_message *); 73 long (*rsa_modexpo_crt)(struct zcrypt_queue *, 74 struct ica_rsa_modexpo_crt *, 75 struct ap_message *); 76 long (*send_cprb)(bool userspace, struct zcrypt_queue *, struct ica_xcRB *, 77 struct ap_message *); 78 long (*send_ep11_cprb)(bool userspace, struct zcrypt_queue *, struct ep11_urb *, 79 struct ap_message *); 80 long (*rng)(struct zcrypt_queue *, char *, struct ap_message *); 81 struct list_head list; /* zcrypt ops list. */ 82 struct module *owner; 83 int variant; 84 char name[128]; 85 }; 86 87 struct zcrypt_card { 88 struct list_head list; /* Device list. */ 89 struct list_head zqueues; /* List of zcrypt queues */ 90 struct kref refcount; /* device refcounting */ 91 struct ap_card *card; /* The "real" ap card device. */ 92 int online; /* User online/offline */ 93 94 int user_space_type; /* User space device id. */ 95 char *type_string; /* User space device name. */ 96 int min_mod_size; /* Min number of bits. */ 97 int max_mod_size; /* Max number of bits. */ 98 int max_exp_bit_length; 99 const int *speed_rating; /* Speed idx of crypto ops. */ 100 atomic_t load; /* Utilization of the crypto device */ 101 102 int request_count; /* # current requests. */ 103 }; 104 105 struct zcrypt_queue { 106 struct list_head list; /* Device list. */ 107 struct kref refcount; /* device refcounting */ 108 struct zcrypt_card *zcard; 109 struct zcrypt_ops *ops; /* Crypto operations. */ 110 struct ap_queue *queue; /* The "real" ap queue device. */ 111 int online; /* User online/offline */ 112 113 atomic_t load; /* Utilization of the crypto device */ 114 115 int request_count; /* # current requests. */ 116 117 struct ap_message reply; /* Per-device reply structure. */ 118 }; 119 120 /* transport layer rescanning */ 121 extern atomic_t zcrypt_rescan_req; 122 123 extern spinlock_t zcrypt_list_lock; 124 extern struct list_head zcrypt_card_list; 125 126 #define for_each_zcrypt_card(_zc) \ 127 list_for_each_entry(_zc, &zcrypt_card_list, list) 128 129 #define for_each_zcrypt_queue(_zq, _zc) \ 130 list_for_each_entry(_zq, &(_zc)->zqueues, list) 131 132 struct zcrypt_card *zcrypt_card_alloc(void); 133 void zcrypt_card_free(struct zcrypt_card *); 134 void zcrypt_card_get(struct zcrypt_card *); 135 int zcrypt_card_put(struct zcrypt_card *); 136 int zcrypt_card_register(struct zcrypt_card *); 137 void zcrypt_card_unregister(struct zcrypt_card *); 138 139 struct zcrypt_queue *zcrypt_queue_alloc(size_t); 140 void zcrypt_queue_free(struct zcrypt_queue *); 141 void zcrypt_queue_get(struct zcrypt_queue *); 142 int zcrypt_queue_put(struct zcrypt_queue *); 143 int zcrypt_queue_register(struct zcrypt_queue *); 144 void zcrypt_queue_unregister(struct zcrypt_queue *); 145 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online); 146 147 int zcrypt_rng_device_add(void); 148 void zcrypt_rng_device_remove(void); 149 150 void zcrypt_msgtype_register(struct zcrypt_ops *); 151 void zcrypt_msgtype_unregister(struct zcrypt_ops *); 152 struct zcrypt_ops *zcrypt_msgtype(unsigned char *, int); 153 int zcrypt_api_init(void); 154 void zcrypt_api_exit(void); 155 long zcrypt_send_cprb(struct ica_xcRB *xcRB); 156 long zcrypt_send_ep11_cprb(struct ep11_urb *urb); 157 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus); 158 int zcrypt_device_status_ext(int card, int queue, 159 struct zcrypt_device_status_ext *devstatus); 160 161 int zcrypt_wait_api_operational(void); 162 163 static inline unsigned long z_copy_from_user(bool userspace, 164 void *to, 165 const void __user *from, 166 unsigned long n) 167 { 168 if (likely(userspace)) 169 return copy_from_user(to, from, n); 170 memcpy(to, (void __force *)from, n); 171 return 0; 172 } 173 174 static inline unsigned long z_copy_to_user(bool userspace, 175 void __user *to, 176 const void *from, 177 unsigned long n) 178 { 179 if (likely(userspace)) 180 return copy_to_user(to, from, n); 181 memcpy((void __force *)to, from, n); 182 return 0; 183 } 184 185 #endif /* _ZCRYPT_API_H_ */ 186