cregit-Linux how code gets into the kernel

Release 4.11 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 <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; }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky13846.00%120.00%
Ralph Wuerthner8729.00%120.00%
Ingo Tuchscherer6923.00%240.00%
Felix Beck62.00%120.00%
Total300100.00%5100.00%

/** * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer16262.79%240.00%
Martin Schwidefsky4918.99%120.00%
Felix Beck4718.22%240.00%
Total258100.00%5100.00%

/** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer35100.00%1100.00%
Total35100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer9556.21%342.86%
Ralph Wuerthner3319.53%114.29%
Martin Schwidefsky3118.34%228.57%
Holger Dengler105.92%114.29%
Total169100.00%7100.00%

/** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer2757.45%150.00%
Martin Schwidefsky2042.55%150.00%
Total47100.00%2100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer3869.09%150.00%
Martin Schwidefsky1730.91%150.00%
Total55100.00%2100.00%


void zcrypt_pcixcc_exit(void) { ap_driver_unregister(&zcrypt_pcixcc_queue_driver); ap_driver_unregister(&zcrypt_pcixcc_card_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Martin Schwidefsky1263.16%150.00%
Ingo Tuchscherer736.84%150.00%
Total19100.00%2100.00%

module_init(zcrypt_pcixcc_init); module_exit(zcrypt_pcixcc_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Ingo Tuchscherer57348.11%320.00%
Martin Schwidefsky34829.22%213.33%
Ralph Wuerthner17014.27%213.33%
Felix Beck625.21%426.67%
Holger Dengler332.77%16.67%
Tejun Heo30.25%16.67%
Arun Sharma10.08%16.67%
Linus Torvalds10.08%16.67%
Total1191100.00%15100.00%
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