cregit-Linux how code gets into the kernel

Release 4.7 drivers/s390/crypto/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 <asm/uaccess.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_MCL2_SPEED_RATING	7870

#define PCIXCC_MCL3_SPEED_RATING	7870

#define CEX2C_SPEED_RATING		7000

#define CEX3C_SPEED_RATING		6500


#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


static struct ap_device_id zcrypt_pcixcc_ids[] = {
	{ AP_DEVICE(AP_DEVICE_TYPE_PCIXCC) },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2C) },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX3C) },
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " \
		   "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");

static int zcrypt_pcixcc_probe(struct ap_device *ap_dev);
static void zcrypt_pcixcc_remove(struct ap_device *ap_dev);


static struct ap_driver zcrypt_pcixcc_driver = {
	.probe = zcrypt_pcixcc_probe,
	.remove = zcrypt_pcixcc_remove,
	.ids = zcrypt_pcixcc_ids,
	.request_timeout = PCIXCC_CLEANUP_TIME,
};

/**
 * Micro-code detection function. Its sends a message to a pcixcc card
 * to find out the microcode level.
 * @ap_dev: pointer to the AP device.
 */

static int zcrypt_pcixcc_mcl(struct ap_device *ap_dev) { static unsigned char msg[] = { 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x43,0x41,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x50,0x4B,0x00,0x00, 0x00,0x00,0x01,0xC4,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x07,0x24,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0xDC,0x02,0x00,0x00,0x00,0x54,0x32, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE8, 0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x24, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x50,0x4B,0x00,0x0A, 0x4D,0x52,0x50,0x20,0x20,0x20,0x20,0x20, 0x00,0x42,0x00,0x01,0x02,0x03,0x04,0x05, 0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D, 0x0E,0x0F,0x00,0x11,0x22,0x33,0x44,0x55, 0x66,0x77,0x88,0x99,0xAA,0xBB,0xCC,0xDD, 0xEE,0xFF,0xFF,0xEE,0xDD,0xCC,0xBB,0xAA, 0x99,0x88,0x77,0x66,0x55,0x44,0x33,0x22, 0x11,0x00,0x01,0x23,0x45,0x67,0x89,0xAB, 0xCD,0xEF,0xFE,0xDC,0xBA,0x98,0x76,0x54, 0x32,0x10,0x00,0x9A,0x00,0x98,0x00,0x00, 0x1E,0x00,0x00,0x94,0x00,0x00,0x00,0x00, 0x04,0x00,0x00,0x8C,0x00,0x00,0x00,0x40, 0x02,0x00,0x00,0x40,0xBA,0xE8,0x23,0x3C, 0x75,0xF3,0x91,0x61,0xD6,0x73,0x39,0xCF, 0x7B,0x6D,0x8E,0x61,0x97,0x63,0x9E,0xD9, 0x60,0x55,0xD6,0xC7,0xEF,0xF8,0x1E,0x63, 0x95,0x17,0xCC,0x28,0x45,0x60,0x11,0xC5, 0xC4,0x4E,0x66,0xC6,0xE6,0xC3,0xDE,0x8A, 0x19,0x30,0xCF,0x0E,0xD7,0xAA,0xDB,0x01, 0xD8,0x00,0xBB,0x8F,0x39,0x9F,0x64,0x28, 0xF5,0x7A,0x77,0x49,0xCC,0x6B,0xA3,0x91, 0x97,0x70,0xE7,0x60,0x1E,0x39,0xE1,0xE5, 0x33,0xE1,0x15,0x63,0x69,0x08,0x80,0x4C, 0x67,0xC4,0x41,0x8F,0x48,0xDF,0x26,0x98, 0xF1,0xD5,0x8D,0x88,0xD9,0x6A,0xA4,0x96, 0xC5,0x84,0xD9,0x30,0x49,0x67,0x7D,0x19, 0xB1,0xB3,0x45,0x4D,0xB2,0x53,0x9A,0x47, 0x3C,0x7C,0x55,0xBF,0xCC,0x85,0x00,0x36, 0xF1,0x3D,0x93,0x53 }; unsigned long long psmid; struct CPRBX *cprbx; char *reply; int rc, i; reply = (void *) get_zeroed_page(GFP_KERNEL); if (!reply) return -ENOMEM; rc = ap_send(ap_dev->qid, 0x0102030405060708ULL, msg, sizeof(msg)); if (rc) goto out_free; /* Wait for the test message to complete. */ for (i = 0; i < 6; i++) { msleep(300); rc = ap_recv(ap_dev->qid, &psmid, reply, 4096); if (rc == 0 && psmid == 0x0102030405060708ULL) break; } if (i >= 6) { /* Got no answer. */ rc = -ENODEV; goto out_free; } cprbx = (struct CPRBX *) (reply + 48); if (cprbx->ccp_rtcode == 8 && cprbx->ccp_rscode == 33) rc = ZCRYPT_PCIXCC_MCL2; else rc = ZCRYPT_PCIXCC_MCL3; out_free: free_page((unsigned long) reply); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky110586.46%133.33%
ralph wuerthnerralph wuerthner17213.46%133.33%
heiko carstensheiko carstens10.08%133.33%
Total1278100.00%3100.00%

/** * 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_device *ap_dev) { struct ap_message ap_msg; unsigned long long psmid; struct { struct type86_hdr hdr; struct type86_fmt2_ext fmt2; struct CPRBX cprbx; } __attribute__((packed)) *reply; 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_dev, &ap_msg, 4); rc = ap_send(ap_dev->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(ap_dev->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; }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky14059.07%133.33%
ralph wuerthnerralph wuerthner9138.40%133.33%
felix beckfelix beck62.53%133.33%
Total237100.00%3100.00%

/** * Probe function for PCIXCC/CEX2C cards. 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 device. */
static int zcrypt_pcixcc_probe(struct ap_device *ap_dev) { struct zcrypt_device *zdev; int rc = 0; zdev = zcrypt_device_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE); if (!zdev) return -ENOMEM; zdev->ap_dev = ap_dev; zdev->online = 1; switch (ap_dev->device_type) { case AP_DEVICE_TYPE_PCIXCC: rc = zcrypt_pcixcc_mcl(ap_dev); if (rc < 0) { zcrypt_device_free(zdev); return rc; } zdev->user_space_type = rc; if (rc == ZCRYPT_PCIXCC_MCL2) { zdev->type_string = "PCIXCC_MCL2"; zdev->speed_rating = PCIXCC_MCL2_SPEED_RATING; zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE_OLD; zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE; zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE; } else { zdev->type_string = "PCIXCC_MCL3"; zdev->speed_rating = PCIXCC_MCL3_SPEED_RATING; zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE; zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE; zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE; } break; case AP_DEVICE_TYPE_CEX2C: zdev->user_space_type = ZCRYPT_CEX2C; zdev->type_string = "CEX2C"; zdev->speed_rating = CEX2C_SPEED_RATING; zdev->min_mod_size = PCIXCC_MIN_MOD_SIZE; zdev->max_mod_size = PCIXCC_MAX_MOD_SIZE; zdev->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE; break; case AP_DEVICE_TYPE_CEX3C: zdev->user_space_type = ZCRYPT_CEX3C; zdev->type_string = "CEX3C"; zdev->speed_rating = CEX3C_SPEED_RATING; zdev->min_mod_size = CEX3C_MIN_MOD_SIZE; zdev->max_mod_size = CEX3C_MAX_MOD_SIZE; zdev->max_exp_bit_length = CEX3C_MAX_MOD_SIZE; break; default: goto out_free; } rc = zcrypt_pcixcc_rng_supported(ap_dev); if (rc < 0) { zcrypt_device_free(zdev); return rc; } if (rc) zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME, MSGTYPE06_VARIANT_DEFAULT); else zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME, MSGTYPE06_VARIANT_NORNG); ap_dev->reply = &zdev->reply; ap_dev->private = zdev; rc = zcrypt_device_register(zdev); if (rc) goto out_free; return 0; out_free: ap_dev->private = NULL; zcrypt_msgtype_release(zdev->ops); zcrypt_device_free(zdev); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky21962.57%116.67%
felix beckfelix beck7320.86%233.33%
ralph wuerthnerralph wuerthner3810.86%116.67%
holger denglerholger dengler205.71%233.33%
Total350100.00%6100.00%

/** * This is called to remove the extended PCIXCC/CEX2C driver information * if an AP device is removed. */
static void zcrypt_pcixcc_remove(struct ap_device *ap_dev) { struct zcrypt_device *zdev = ap_dev->private; struct zcrypt_ops *zops = zdev->ops; zcrypt_device_unregister(zdev); zcrypt_msgtype_release(zops); }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky2564.10%150.00%
holger denglerholger dengler1435.90%150.00%
Total39100.00%2100.00%


int __init zcrypt_pcixcc_init(void) { return ap_driver_register(&zcrypt_pcixcc_driver, THIS_MODULE, "pcixcc"); }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky19100.00%1100.00%
Total19100.00%1100.00%


void zcrypt_pcixcc_exit(void) { ap_driver_unregister(&zcrypt_pcixcc_driver); }

Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky13100.00%1100.00%
Total13100.00%1100.00%

module_init(zcrypt_pcixcc_init); module_exit(zcrypt_pcixcc_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky161474.07%17.14%
ralph wuerthnerralph wuerthner35416.25%214.29%
holger denglerholger dengler1115.09%214.29%
felix beckfelix beck954.36%642.86%
tejun heotejun heo30.14%17.14%
heiko carstensheiko carstens10.05%17.14%
arun sharmaarun sharma10.05%17.14%
Total2179100.00%14100.00%
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