diff options
Diffstat (limited to 'drivers/s390/crypto/zcrypt_cex2a.c')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_cex2a.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c new file mode 100644 index 000000000..83f692c9c --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cex2a.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.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> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/atomic.h> +#include <linux/uaccess.h> +#include <linux/mod_devicetable.h> + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_cex2a.h" +#include "zcrypt_msgtype50.h" + +#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */ +#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */ +#define CEX3A_MIN_MOD_SIZE CEX2A_MIN_MOD_SIZE +#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */ + +#define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ +#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ + +#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus + * (max outputdatalength) + + * type80_hdr + */ +#define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg) + +#define CEX2A_CLEANUP_TIME (15 * HZ) +#define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("CEX2A/CEX3A Cryptographic Coprocessor device driver, " \ + "Copyright IBM Corp. 2001, 2018"); +MODULE_LICENSE("GPL"); + +static struct ap_device_id zcrypt_cex2a_card_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX2A, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3A, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids); + +static struct ap_device_id zcrypt_cex2a_queue_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX2A, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3A, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids); + +/* + * Probe function for CEX2A card devices. It always accepts the AP device + * since the bus_match already checked the card type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev) +{ + /* + * Normalized speed ratings per crypto adapter + * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY + */ + static const int CEX2A_SPEED_IDX[] = { + 800, 1000, 2000, 900, 1200, 2400, 0, 0}; + static const int CEX3A_SPEED_IDX[] = { + 400, 500, 1000, 450, 550, 1200, 0, 0}; + + struct ap_card *ac = to_ap_card(&ap_dev->device); + struct zcrypt_card *zc; + int rc = 0; + + zc = zcrypt_card_alloc(); + if (!zc) + return -ENOMEM; + zc->card = ac; + dev_set_drvdata(&ap_dev->device, zc); + + if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) { + zc->min_mod_size = CEX2A_MIN_MOD_SIZE; + zc->max_mod_size = CEX2A_MAX_MOD_SIZE; + zc->speed_rating = CEX2A_SPEED_IDX; + zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + zc->type_string = "CEX2A"; + zc->user_space_type = ZCRYPT_CEX2A; + } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) { + zc->min_mod_size = CEX2A_MIN_MOD_SIZE; + zc->max_mod_size = CEX2A_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) && + ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) { + zc->max_mod_size = CEX3A_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE; + } + zc->speed_rating = CEX3A_SPEED_IDX; + zc->type_string = "CEX3A"; + zc->user_space_type = ZCRYPT_CEX3A; + } else { + zcrypt_card_free(zc); + return -ENODEV; + } + zc->online = 1; + + rc = zcrypt_card_register(zc); + if (rc) + zcrypt_card_free(zc); + + return rc; +} + +/* + * This is called to remove the CEX2A card driver information + * if an AP card device is removed. + */ +static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev) +{ + struct zcrypt_card *zc = dev_get_drvdata(&ap_dev->device); + + zcrypt_card_unregister(zc); +} + +static struct ap_driver zcrypt_cex2a_card_driver = { + .probe = zcrypt_cex2a_card_probe, + .remove = zcrypt_cex2a_card_remove, + .ids = zcrypt_cex2a_card_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +/* + * Probe function for CEX2A queue devices. It always accepts the AP device + * since the bus_match already checked the queue type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq = NULL; + int rc; + + switch (ap_dev->device_type) { + case AP_DEVICE_TYPE_CEX2A: + zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE); + if (!zq) + return -ENOMEM; + break; + case AP_DEVICE_TYPE_CEX3A: + zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE); + if (!zq) + return -ENOMEM; + break; + } + if (!zq) + return -ENODEV; + zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT); + zq->queue = aq; + zq->online = 1; + atomic_set(&zq->load, 0); + ap_queue_init_state(aq); + ap_queue_init_reply(aq, &zq->reply); + aq->request_timeout = CEX2A_CLEANUP_TIME; + dev_set_drvdata(&ap_dev->device, zq); + rc = zcrypt_queue_register(zq); + if (rc) + zcrypt_queue_free(zq); + + return rc; +} + +/* + * This is called to remove the CEX2A queue driver information + * if an AP queue device is removed. + */ +static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev) +{ + struct zcrypt_queue *zq = dev_get_drvdata(&ap_dev->device); + + zcrypt_queue_unregister(zq); +} + +static struct ap_driver zcrypt_cex2a_queue_driver = { + .probe = zcrypt_cex2a_queue_probe, + .remove = zcrypt_cex2a_queue_remove, + .ids = zcrypt_cex2a_queue_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +int __init zcrypt_cex2a_init(void) +{ + int rc; + + rc = ap_driver_register(&zcrypt_cex2a_card_driver, + THIS_MODULE, "cex2acard"); + if (rc) + return rc; + + rc = ap_driver_register(&zcrypt_cex2a_queue_driver, + THIS_MODULE, "cex2aqueue"); + if (rc) + ap_driver_unregister(&zcrypt_cex2a_card_driver); + + return rc; +} + +void __exit zcrypt_cex2a_exit(void) +{ + ap_driver_unregister(&zcrypt_cex2a_queue_driver); + ap_driver_unregister(&zcrypt_cex2a_card_driver); +} + +module_init(zcrypt_cex2a_init); +module_exit(zcrypt_cex2a_exit); |