swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
Tip revision: a351e9b9fc24e982ec2f0e76379a49826036da12 authored by Linus Torvalds on 01 May 2017, 02:47:48 UTC
Linux 4.11
Linux 4.11
Tip revision: a351e9b
zcrypt_pcixcc.c
/*
* zcrypt 2.1.0
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/slab.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_msgtype6.h"
#include "zcrypt_pcixcc.h"
#include "zcrypt_cca_key.h"
#define PCIXCC_MIN_MOD_SIZE 16 /* 128 bits */
#define PCIXCC_MIN_MOD_SIZE_OLD 64 /* 512 bits */
#define PCIXCC_MAX_MOD_SIZE 256 /* 2048 bits */
#define CEX3C_MIN_MOD_SIZE PCIXCC_MIN_MOD_SIZE
#define CEX3C_MAX_MOD_SIZE 512 /* 4096 bits */
#define PCIXCC_MAX_ICA_MESSAGE_SIZE 0x77c /* max size type6 v2 crt message */
#define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply */
#define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024)
#define PCIXCC_CLEANUP_TIME (15*HZ)
#define CEIL4(x) ((((x)+3)/4)*4)
struct response_type {
struct completion work;
int type;
};
#define PCIXCC_RESPONSE_TYPE_ICA 0
#define PCIXCC_RESPONSE_TYPE_XCRB 1
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " \
"Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");
static struct ap_device_id zcrypt_pcixcc_card_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_PCIXCC,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX2C,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX3C,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_card_ids);
static struct ap_device_id zcrypt_pcixcc_queue_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_PCIXCC,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX2C,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX3C,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_queue_ids);
/**
* Large random number detection function. Its sends a message to a pcixcc
* card to find out if large random numbers are supported.
* @ap_dev: pointer to the AP device.
*
* Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
*/
static int zcrypt_pcixcc_rng_supported(struct ap_queue *aq)
{
struct ap_message ap_msg;
unsigned long long psmid;
unsigned int domain;
struct {
struct type86_hdr hdr;
struct type86_fmt2_ext fmt2;
struct CPRBX cprbx;
} __attribute__((packed)) *reply;
struct {
struct type6_hdr hdr;
struct CPRBX cprbx;
char function_code[2];
short int rule_length;
char rule[8];
short int verb_length;
short int key_length;
} __packed * msg;
int rc, i;
ap_init_message(&ap_msg);
ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
if (!ap_msg.message)
return -ENOMEM;
rng_type6CPRB_msgX(&ap_msg, 4, &domain);
msg = ap_msg.message;
msg->cprbx.domain = AP_QID_QUEUE(aq->qid);
rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.message,
ap_msg.length);
if (rc)
goto out_free;
/* Wait for the test message to complete. */
for (i = 0; i < 2 * HZ; i++) {
msleep(1000 / HZ);
rc = ap_recv(aq->qid, &psmid, ap_msg.message, 4096);
if (rc == 0 && psmid == 0x0102030405060708ULL)
break;
}
if (i >= 2 * HZ) {
/* Got no answer. */
rc = -ENODEV;
goto out_free;
}
reply = ap_msg.message;
if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
rc = 1;
else
rc = 0;
out_free:
free_page((unsigned long) ap_msg.message);
return rc;
}
/**
* Probe function for PCIXCC/CEX2C card devices. It always accepts the
* AP device since the bus_match already checked the hardware type. The
* PCIXCC cards come in two flavours: micro code level 2 and micro code
* level 3. This is checked by sending a test message to the device.
* @ap_dev: pointer to the AP card device.
*/
static int zcrypt_pcixcc_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 CEX2C_SPEED_IDX[] = {
1000, 1400, 2400, 1100, 1500, 2600, 100, 12};
static const int CEX3C_SPEED_IDX[] = {
500, 700, 1400, 550, 800, 1500, 80, 10};
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;
ac->private = zc;
switch (ac->ap_dev.device_type) {
case AP_DEVICE_TYPE_CEX2C:
zc->user_space_type = ZCRYPT_CEX2C;
zc->type_string = "CEX2C";
memcpy(zc->speed_rating, CEX2C_SPEED_IDX,
sizeof(CEX2C_SPEED_IDX));
zc->min_mod_size = PCIXCC_MIN_MOD_SIZE;
zc->max_mod_size = PCIXCC_MAX_MOD_SIZE;
zc->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE;
break;
case AP_DEVICE_TYPE_CEX3C:
zc->user_space_type = ZCRYPT_CEX3C;
zc->type_string = "CEX3C";
memcpy(zc->speed_rating, CEX3C_SPEED_IDX,
sizeof(CEX3C_SPEED_IDX));
zc->min_mod_size = CEX3C_MIN_MOD_SIZE;
zc->max_mod_size = CEX3C_MAX_MOD_SIZE;
zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
break;
default:
zcrypt_card_free(zc);
return -ENODEV;
}
zc->online = 1;
rc = zcrypt_card_register(zc);
if (rc) {
ac->private = NULL;
zcrypt_card_free(zc);
}
return rc;
}
/**
* This is called to remove the PCIXCC/CEX2C card driver information
* if an AP card device is removed.
*/
static void zcrypt_pcixcc_card_remove(struct ap_device *ap_dev)
{
struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
if (zc)
zcrypt_card_unregister(zc);
}
static struct ap_driver zcrypt_pcixcc_card_driver = {
.probe = zcrypt_pcixcc_card_probe,
.remove = zcrypt_pcixcc_card_remove,
.ids = zcrypt_pcixcc_card_ids,
};
/**
* Probe function for PCIXCC/CEX2C queue devices. It always accepts the
* AP device since the bus_match already checked the hardware type. The
* PCIXCC cards come in two flavours: micro code level 2 and micro code
* level 3. This is checked by sending a test message to the device.
* @ap_dev: pointer to the AP card device.
*/
static int zcrypt_pcixcc_queue_probe(struct ap_device *ap_dev)
{
struct ap_queue *aq = to_ap_queue(&ap_dev->device);
struct zcrypt_queue *zq;
int rc;
zq = zcrypt_queue_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE);
if (!zq)
return -ENOMEM;
zq->queue = aq;
zq->online = 1;
atomic_set(&zq->load, 0);
rc = zcrypt_pcixcc_rng_supported(aq);
if (rc < 0) {
zcrypt_queue_free(zq);
return rc;
}
if (rc)
zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_DEFAULT);
else
zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_NORNG);
ap_queue_init_reply(aq, &zq->reply);
aq->request_timeout = PCIXCC_CLEANUP_TIME,
aq->private = zq;
rc = zcrypt_queue_register(zq);
if (rc) {
aq->private = NULL;
zcrypt_queue_free(zq);
}
return rc;
}
/**
* This is called to remove the PCIXCC/CEX2C queue driver information
* if an AP queue device is removed.
*/
static void zcrypt_pcixcc_queue_remove(struct ap_device *ap_dev)
{
struct ap_queue *aq = to_ap_queue(&ap_dev->device);
struct zcrypt_queue *zq = aq->private;
ap_queue_remove(aq);
if (zq)
zcrypt_queue_unregister(zq);
}
static struct ap_driver zcrypt_pcixcc_queue_driver = {
.probe = zcrypt_pcixcc_queue_probe,
.remove = zcrypt_pcixcc_queue_remove,
.suspend = ap_queue_suspend,
.resume = ap_queue_resume,
.ids = zcrypt_pcixcc_queue_ids,
};
int __init zcrypt_pcixcc_init(void)
{
int rc;
rc = ap_driver_register(&zcrypt_pcixcc_card_driver,
THIS_MODULE, "pcixcccard");
if (rc)
return rc;
rc = ap_driver_register(&zcrypt_pcixcc_queue_driver,
THIS_MODULE, "pcixccqueue");
if (rc)
ap_driver_unregister(&zcrypt_pcixcc_card_driver);
return rc;
}
void zcrypt_pcixcc_exit(void)
{
ap_driver_unregister(&zcrypt_pcixcc_queue_driver);
ap_driver_unregister(&zcrypt_pcixcc_card_driver);
}
module_init(zcrypt_pcixcc_init);
module_exit(zcrypt_pcixcc_exit);