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