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 * The zcrypt_wait_api_operational() function waits this 43 * amount in milliseconds for ap_wait_aqpn_bindings_complete(). 44 * Also on a cprb send failure with ENODEV the send functions 45 * trigger an ap bus rescan and wait this time in milliseconds 46 * for ap_wait_aqpn_bindings_complete() before resending. 47 */ 48 #define ZCRYPT_WAIT_BINDINGS_COMPLETE_MS 30000 49 50 /* 51 * Identifier for Crypto Request Performance Index 52 */ 53 enum crypto_ops { 54 MEX_1K, 55 MEX_2K, 56 MEX_4K, 57 CRT_1K, 58 CRT_2K, 59 CRT_4K, 60 HWRNG, 61 SECKEY, 62 NUM_OPS 63 }; 64 65 struct zcrypt_queue; 66 67 /* struct to hold tracking information for a userspace request/response */ 68 struct zcrypt_track { 69 int again_counter; /* retry attempts counter */ 70 int last_qid; /* last qid used */ 71 int last_rc; /* last return code */ 72 }; 73 74 /* defines related to message tracking */ 75 #define TRACK_AGAIN_MAX 10 76 #define TRACK_AGAIN_CARD_WEIGHT_PENALTY 1000 77 #define TRACK_AGAIN_QUEUE_WEIGHT_PENALTY 10000 78 79 /* 80 * xflags - to be used with zcrypt_send_cprb() and 81 * zcrypt_send_ep11_cprb() for the xflags parameter. 82 */ 83 #define ZCRYPT_XFLAG_USERSPACE 0x0001 /* data ptrs address userspace */ 84 #define ZCRYPT_XFLAG_NOMEMALLOC 0x0002 /* do not allocate memory via kmalloc */ 85 86 struct zcrypt_ops { 87 long (*rsa_modexpo)(struct zcrypt_queue *, struct ica_rsa_modexpo *, 88 struct ap_message *); 89 long (*rsa_modexpo_crt)(struct zcrypt_queue *, 90 struct ica_rsa_modexpo_crt *, 91 struct ap_message *); 92 long (*send_cprb)(bool userspace, struct zcrypt_queue *, struct ica_xcRB *, 93 struct ap_message *); 94 long (*send_ep11_cprb)(bool userspace, struct zcrypt_queue *, struct ep11_urb *, 95 struct ap_message *); 96 long (*rng)(struct zcrypt_queue *, char *, struct ap_message *); 97 struct list_head list; /* zcrypt ops list. */ 98 struct module *owner; 99 int variant; 100 char name[128]; 101 }; 102 103 struct zcrypt_card { 104 struct list_head list; /* Device list. */ 105 struct list_head zqueues; /* List of zcrypt queues */ 106 struct kref refcount; /* device refcounting */ 107 int online; /* User online/offline */ 108 struct ap_card *card; /* The "real" ap card device. */ 109 char *type_string; /* User space device name. */ 110 int user_space_type; /* User space device id. */ 111 int min_mod_size; /* Min number of bits. */ 112 int max_mod_size; /* Max number of bits. */ 113 int max_exp_bit_length; 114 const int *speed_rating; /* Speed idx of crypto ops. */ 115 atomic_t load; /* Utilization of the crypto device */ 116 int request_count; /* # current requests. */ 117 }; 118 119 struct zcrypt_queue { 120 struct list_head list; /* Device list. */ 121 struct kref refcount; /* device refcounting */ 122 int online; /* User online/offline */ 123 struct zcrypt_card *zcard; 124 struct zcrypt_ops *ops; /* Crypto operations. */ 125 struct ap_queue *queue; /* The "real" ap queue device. */ 126 struct ap_message reply; /* Per-device reply structure. */ 127 atomic_t load; /* Utilization of the crypto device */ 128 int request_count; /* # current requests. */ 129 }; 130 131 /* transport layer rescanning */ 132 extern atomic_t zcrypt_rescan_req; 133 134 extern spinlock_t zcrypt_list_lock; 135 extern struct list_head zcrypt_card_list; 136 137 extern unsigned int zcrypt_mempool_threshold; 138 139 #define for_each_zcrypt_card(_zc) \ 140 list_for_each_entry(_zc, &zcrypt_card_list, list) 141 142 #define for_each_zcrypt_queue(_zq, _zc) \ 143 list_for_each_entry(_zq, &(_zc)->zqueues, list) 144 145 struct zcrypt_card *zcrypt_card_alloc(void); 146 void zcrypt_card_free(struct zcrypt_card *); 147 void zcrypt_card_get(struct zcrypt_card *); 148 int zcrypt_card_put(struct zcrypt_card *); 149 int zcrypt_card_register(struct zcrypt_card *); 150 void zcrypt_card_unregister(struct zcrypt_card *); 151 152 struct zcrypt_queue *zcrypt_queue_alloc(size_t); 153 void zcrypt_queue_free(struct zcrypt_queue *); 154 void zcrypt_queue_get(struct zcrypt_queue *); 155 int zcrypt_queue_put(struct zcrypt_queue *); 156 int zcrypt_queue_register(struct zcrypt_queue *); 157 void zcrypt_queue_unregister(struct zcrypt_queue *); 158 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online); 159 160 int zcrypt_rng_device_add(void); 161 void zcrypt_rng_device_remove(void); 162 163 void zcrypt_msgtype_register(struct zcrypt_ops *); 164 void zcrypt_msgtype_unregister(struct zcrypt_ops *); 165 struct zcrypt_ops *zcrypt_msgtype(unsigned char *, int); 166 int zcrypt_api_init(void); 167 void zcrypt_api_exit(void); 168 long zcrypt_send_cprb(struct ica_xcRB *xcRB, u32 xflags); 169 long zcrypt_send_ep11_cprb(struct ep11_urb *urb, u32 xflags); 170 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus, 171 int maxcard, int maxqueue); 172 int zcrypt_device_status_ext(int card, int queue, 173 struct zcrypt_device_status_ext *devstatus); 174 175 int zcrypt_wait_api_operational(void); 176 177 static inline unsigned long z_copy_from_user(bool userspace, 178 void *to, 179 const void __user *from, 180 unsigned long n) 181 { 182 if (likely(userspace)) 183 return copy_from_user(to, from, n); 184 memcpy(to, (void __force *)from, n); 185 return 0; 186 } 187 188 static inline unsigned long z_copy_to_user(bool userspace, 189 void __user *to, 190 const void *from, 191 unsigned long n) 192 { 193 if (likely(userspace)) 194 return copy_to_user(to, from, n); 195 memcpy((void __force *)to, from, n); 196 return 0; 197 } 198 199 #endif /* _ZCRYPT_API_H_ */ 200