zcrypt_cex4.c
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/*
* Copyright IBM Corp. 2012
* Author(s): 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 "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"
#include "zcrypt_error.h"
#include "zcrypt_cex4.h"
#define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */
#define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */
#define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */
#define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */
#define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */
#define CEX4A_SPEED_RATING 900 /* TODO new card, new speed rating */
#define CEX4C_SPEED_RATING 6500 /* TODO new card, new speed rating */
#define CEX4P_SPEED_RATING 7000 /* TODO new card, new speed rating */
#define CEX5A_SPEED_RATING 450 /* TODO new card, new speed rating */
#define CEX5C_SPEED_RATING 3250 /* TODO new card, new speed rating */
#define CEX5P_SPEED_RATING 3500 /* TODO new card, new speed rating */
#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE
/* Waiting time for requests to be processed.
* Currently there are some types of request which are not deterministic.
* But the maximum time limit managed by the stomper code is set to 60sec.
* Hence we have to wait at least that time period.
*/
#define CEX4_CLEANUP_TIME (900*HZ)
static struct ap_device_id zcrypt_cex4_ids[] = {
{ AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
{ AP_DEVICE(AP_DEVICE_TYPE_CEX5) },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
"Copyright IBM Corp. 2012");
MODULE_LICENSE("GPL");
static int zcrypt_cex4_probe(struct ap_device *ap_dev);
static void zcrypt_cex4_remove(struct ap_device *ap_dev);
static struct ap_driver zcrypt_cex4_driver = {
.probe = zcrypt_cex4_probe,
.remove = zcrypt_cex4_remove,
.ids = zcrypt_cex4_ids,
.request_timeout = CEX4_CLEANUP_TIME,
};
/**
* Probe function for CEX4 cards. It always accepts the AP device
* since the bus_match already checked the hardware type.
* @ap_dev: pointer to the AP device.
*/
static int zcrypt_cex4_probe(struct ap_device *ap_dev)
{
struct zcrypt_device *zdev = NULL;
int rc = 0;
switch (ap_dev->device_type) {
case AP_DEVICE_TYPE_CEX4:
case AP_DEVICE_TYPE_CEX5:
if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
if (!zdev)
return -ENOMEM;
if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
zdev->type_string = "CEX4A";
zdev->speed_rating = CEX4A_SPEED_RATING;
} else {
zdev->type_string = "CEX5A";
zdev->speed_rating = CEX5A_SPEED_RATING;
}
zdev->user_space_type = ZCRYPT_CEX3A;
zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
zdev->max_mod_size =
CEX4A_MAX_MOD_SIZE_4K;
zdev->max_exp_bit_length =
CEX4A_MAX_MOD_SIZE_4K;
} else {
zdev->max_mod_size =
CEX4A_MAX_MOD_SIZE_2K;
zdev->max_exp_bit_length =
CEX4A_MAX_MOD_SIZE_2K;
}
zdev->short_crt = 1;
zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
MSGTYPE50_VARIANT_DEFAULT);
} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
if (!zdev)
return -ENOMEM;
if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
zdev->type_string = "CEX4C";
zdev->speed_rating = CEX4C_SPEED_RATING;
} else {
zdev->type_string = "CEX5C";
zdev->speed_rating = CEX5C_SPEED_RATING;
}
zdev->user_space_type = ZCRYPT_CEX3C;
zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
zdev->short_crt = 0;
zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_DEFAULT);
} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_EP11)) {
zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
if (!zdev)
return -ENOMEM;
if (ap_dev->device_type == AP_DEVICE_TYPE_CEX4) {
zdev->type_string = "CEX4P";
zdev->speed_rating = CEX4P_SPEED_RATING;
} else {
zdev->type_string = "CEX5P";
zdev->speed_rating = CEX5P_SPEED_RATING;
}
zdev->user_space_type = ZCRYPT_CEX4;
zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
zdev->short_crt = 0;
zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_EP11);
}
break;
}
if (!zdev)
return -ENODEV;
zdev->ap_dev = ap_dev;
zdev->online = 1;
ap_dev->reply = &zdev->reply;
ap_dev->private = zdev;
rc = zcrypt_device_register(zdev);
if (rc) {
zcrypt_msgtype_release(zdev->ops);
ap_dev->private = NULL;
zcrypt_device_free(zdev);
}
return rc;
}
/**
* This is called to remove the extended CEX4 driver information
* if an AP device is removed.
*/
static void zcrypt_cex4_remove(struct ap_device *ap_dev)
{
struct zcrypt_device *zdev = ap_dev->private;
struct zcrypt_ops *zops;
if (zdev) {
zops = zdev->ops;
zcrypt_device_unregister(zdev);
zcrypt_msgtype_release(zops);
}
}
int __init zcrypt_cex4_init(void)
{
return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
}
void __exit zcrypt_cex4_exit(void)
{
ap_driver_unregister(&zcrypt_cex4_driver);
}
module_init(zcrypt_cex4_init);
module_exit(zcrypt_cex4_exit);