diff options
Diffstat (limited to 'drivers/s390/crypto/zcrypt_api.h')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_api.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_api.h b/drivers/s390/crypto/zcrypt_api.h new file mode 100644 index 000000000..f299deb8b --- /dev/null +++ b/drivers/s390/crypto/zcrypt_api.h @@ -0,0 +1,188 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright IBM Corp. 2001, 2019 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * Cornelia Huck <cornelia.huck@de.ibm.com> + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> + * Ralph Wuerthner <rwuerthn@de.ibm.com> + * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com> + */ + +#ifndef _ZCRYPT_API_H_ +#define _ZCRYPT_API_H_ + +#include <linux/atomic.h> +#include <asm/debug.h> +#include <asm/zcrypt.h> +#include "ap_bus.h" + +/** + * Supported device types + */ +#define ZCRYPT_CEX2C 5 +#define ZCRYPT_CEX2A 6 +#define ZCRYPT_CEX3C 7 +#define ZCRYPT_CEX3A 8 +#define ZCRYPT_CEX4 10 +#define ZCRYPT_CEX5 11 +#define ZCRYPT_CEX6 12 +#define ZCRYPT_CEX7 13 + +/** + * Large random numbers are pulled in 4096 byte chunks from the crypto cards + * and stored in a page. Be careful when increasing this buffer due to size + * limitations for AP requests. + */ +#define ZCRYPT_RNG_BUFFER_SIZE 4096 + +/* + * Identifier for Crypto Request Performance Index + */ +enum crypto_ops { + MEX_1K, + MEX_2K, + MEX_4K, + CRT_1K, + CRT_2K, + CRT_4K, + HWRNG, + SECKEY, + NUM_OPS +}; + +struct zcrypt_queue; + +/* struct to hold tracking information for a userspace request/response */ +struct zcrypt_track { + int again_counter; /* retry attempts counter */ + int last_qid; /* last qid used */ + int last_rc; /* last return code */ +#ifdef CONFIG_ZCRYPT_DEBUG + struct ap_fi fi; /* failure injection cmd */ +#endif +}; + +/* defines related to message tracking */ +#define TRACK_AGAIN_MAX 10 +#define TRACK_AGAIN_CARD_WEIGHT_PENALTY 1000 +#define TRACK_AGAIN_QUEUE_WEIGHT_PENALTY 10000 + +struct zcrypt_ops { + long (*rsa_modexpo)(struct zcrypt_queue *, struct ica_rsa_modexpo *, + struct ap_message *); + long (*rsa_modexpo_crt)(struct zcrypt_queue *, + struct ica_rsa_modexpo_crt *, + struct ap_message *); + long (*send_cprb)(bool userspace, struct zcrypt_queue *, struct ica_xcRB *, + struct ap_message *); + long (*send_ep11_cprb)(bool userspace, struct zcrypt_queue *, struct ep11_urb *, + struct ap_message *); + long (*rng)(struct zcrypt_queue *, char *, struct ap_message *); + struct list_head list; /* zcrypt ops list. */ + struct module *owner; + int variant; + char name[128]; +}; + +struct zcrypt_card { + struct list_head list; /* Device list. */ + struct list_head zqueues; /* List of zcrypt queues */ + struct kref refcount; /* device refcounting */ + struct ap_card *card; /* The "real" ap card device. */ + int online; /* User online/offline */ + + int user_space_type; /* User space device id. */ + char *type_string; /* User space device name. */ + int min_mod_size; /* Min number of bits. */ + int max_mod_size; /* Max number of bits. */ + int max_exp_bit_length; + const int *speed_rating; /* Speed idx of crypto ops. */ + atomic_t load; /* Utilization of the crypto device */ + + int request_count; /* # current requests. */ +}; + +struct zcrypt_queue { + struct list_head list; /* Device list. */ + struct kref refcount; /* device refcounting */ + struct zcrypt_card *zcard; + struct zcrypt_ops *ops; /* Crypto operations. */ + struct ap_queue *queue; /* The "real" ap queue device. */ + int online; /* User online/offline */ + + atomic_t load; /* Utilization of the crypto device */ + + int request_count; /* # current requests. */ + + struct ap_message reply; /* Per-device reply structure. */ +}; + +/* transport layer rescanning */ +extern atomic_t zcrypt_rescan_req; + +extern spinlock_t zcrypt_list_lock; +extern struct list_head zcrypt_card_list; + +#define for_each_zcrypt_card(_zc) \ + list_for_each_entry(_zc, &zcrypt_card_list, list) + +#define for_each_zcrypt_queue(_zq, _zc) \ + list_for_each_entry(_zq, &(_zc)->zqueues, list) + +struct zcrypt_card *zcrypt_card_alloc(void); +void zcrypt_card_free(struct zcrypt_card *); +void zcrypt_card_get(struct zcrypt_card *); +int zcrypt_card_put(struct zcrypt_card *); +int zcrypt_card_register(struct zcrypt_card *); +void zcrypt_card_unregister(struct zcrypt_card *); + +struct zcrypt_queue *zcrypt_queue_alloc(size_t); +void zcrypt_queue_free(struct zcrypt_queue *); +void zcrypt_queue_get(struct zcrypt_queue *); +int zcrypt_queue_put(struct zcrypt_queue *); +int zcrypt_queue_register(struct zcrypt_queue *); +void zcrypt_queue_unregister(struct zcrypt_queue *); +bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online); + +int zcrypt_rng_device_add(void); +void zcrypt_rng_device_remove(void); + +void zcrypt_msgtype_register(struct zcrypt_ops *); +void zcrypt_msgtype_unregister(struct zcrypt_ops *); +struct zcrypt_ops *zcrypt_msgtype(unsigned char *, int); +int zcrypt_api_init(void); +void zcrypt_api_exit(void); +long zcrypt_send_cprb(struct ica_xcRB *xcRB); +long zcrypt_send_ep11_cprb(struct ep11_urb *urb); +void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus); +int zcrypt_device_status_ext(int card, int queue, + struct zcrypt_device_status_ext *devstatus); + +int zcrypt_wait_api_operational(void); + +static inline unsigned long z_copy_from_user(bool userspace, + void *to, + const void __user *from, + unsigned long n) +{ + if (likely(userspace)) + return copy_from_user(to, from, n); + memcpy(to, (void __force *)from, n); + return 0; +} + +static inline unsigned long z_copy_to_user(bool userspace, + void __user *to, + const void *from, + unsigned long n) +{ + if (likely(userspace)) + return copy_to_user(to, from, n); + memcpy((void __force *)to, from, n); + return 0; +} + +#endif /* _ZCRYPT_API_H_ */ |