1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_pcica.c b/drivers/s390/crypto/zcrypt_pcica.c
new file mode 100644
index 00000000000..b6a4ecdc802
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_pcica.c
@@ -0,0 +1,418 @@
+/*
+ *  linux/drivers/s390/crypto/zcrypt_pcica.c
+ *
+ *  zcrypt 2.1.0
+ *
+ *  Copyright (C)  2001, 2006 IBM Corporation
+ *  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>
+ *
+ * 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 <asm/atomic.h>
+#include <asm/uaccess.h>
+
+#include "ap_bus.h"
+#include "zcrypt_api.h"
+#include "zcrypt_error.h"
+#include "zcrypt_pcica.h"
+
+#define PCICA_MIN_MOD_SIZE	  1	/*    8 bits	*/
+#define PCICA_MAX_MOD_SIZE	256	/* 2048 bits	*/
+
+#define PCICA_SPEED_RATING	2800
+
+#define PCICA_MAX_MESSAGE_SIZE	0x3a0	/* sizeof(struct type4_lcr)	     */
+#define PCICA_MAX_RESPONSE_SIZE 0x110	/* max outputdatalength + type80_hdr */
+
+#define PCICA_CLEANUP_TIME	(15*HZ)
+
+static struct ap_device_id zcrypt_pcica_ids[] = {
+	{ AP_DEVICE(AP_DEVICE_TYPE_PCICA) },
+	{ /* end of list */ },
+};
+
+#ifndef CONFIG_ZCRYPT_MONOLITHIC
+MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids);
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, "
+		   "Copyright 2001, 2006 IBM Corporation");
+MODULE_LICENSE("GPL");
+#endif
+
+static int zcrypt_pcica_probe(struct ap_device *ap_dev);
+static void zcrypt_pcica_remove(struct ap_device *ap_dev);
+static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *,
+				 struct ap_message *);
+
+static struct ap_driver zcrypt_pcica_driver = {
+	.probe = zcrypt_pcica_probe,
+	.remove = zcrypt_pcica_remove,
+	.receive = zcrypt_pcica_receive,
+	.ids = zcrypt_pcica_ids,
+};
+
+/**
+ * Convert a ICAMEX message to a type4 MEX message.
+ *
+ * @zdev: crypto device pointer
+ * @zreq: crypto request pointer
+ * @mex: pointer to user input data
+ *
+ * Returns 0 on success or -EFAULT.
+ */
+static int ICAMEX_msg_to_type4MEX_msg(struct zcrypt_device *zdev,
+				      struct ap_message *ap_msg,
+				      struct ica_rsa_modexpo *mex)
+{
+	unsigned char *modulus, *exponent, *message;
+	int mod_len;
+
+	mod_len = mex->inputdatalength;
+
+	if (mod_len <= 128) {
+		struct type4_sme *sme = ap_msg->message;
+		memset(sme, 0, sizeof(*sme));
+		ap_msg->length = sizeof(*sme);
+		sme->header.msg_fmt = TYPE4_SME_FMT;
+		sme->header.msg_len = sizeof(*sme);
+		sme->header.msg_type_code = TYPE4_TYPE_CODE;
+		sme->header.request_code = TYPE4_REQU_CODE;
+		modulus = sme->modulus + sizeof(sme->modulus) - mod_len;
+		exponent = sme->exponent + sizeof(sme->exponent) - mod_len;
+		message = sme->message + sizeof(sme->message) - mod_len;
+	} else {
+		struct type4_lme *lme = ap_msg->message;
+		memset(lme, 0, sizeof(*lme));
+		ap_msg->length = sizeof(*lme);
+		lme->header.msg_fmt = TYPE4_LME_FMT;
+		lme->header.msg_len = sizeof(*lme);
+		lme->header.msg_type_code = TYPE4_TYPE_CODE;
+		lme->header.request_code = TYPE4_REQU_CODE;
+		modulus = lme->modulus + sizeof(lme->modulus) - mod_len;
+		exponent = lme->exponent + sizeof(lme->exponent) - mod_len;
+		message = lme->message + sizeof(lme->message) - mod_len;
+	}
+
+	if (copy_from_user(modulus, mex->n_modulus, mod_len) ||
+	    copy_from_user(exponent, mex->b_key, mod_len) ||
+	    copy_from_user(message, mex->inputdata, mod_len))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Convert a ICACRT message to a type4 CRT message.
+ *
+ * @zdev: crypto device pointer
+ * @zreq: crypto request pointer
+ * @crt: pointer to user input data
+ *
+ * Returns 0 on success or -EFAULT.
+ */
+static int ICACRT_msg_to_type4CRT_msg(struct zcrypt_device *zdev,
+				      struct ap_message *ap_msg,
+				      struct ica_rsa_modexpo_crt *crt)
+{
+	unsigned char *p, *q, *dp, *dq, *u, *inp;
+	int mod_len, short_len, long_len;
+
+	mod_len = crt->inputdatalength;
+	short_len = mod_len / 2;
+	long_len = mod_len / 2 + 8;
+
+	if (mod_len <= 128) {
+		struct type4_scr *scr = ap_msg->message;
+		memset(scr, 0, sizeof(*scr));
+		ap_msg->length = sizeof(*scr);
+		scr->header.msg_type_code = TYPE4_TYPE_CODE;
+		scr->header.request_code = TYPE4_REQU_CODE;
+		scr->header.msg_fmt = TYPE4_SCR_FMT;
+		scr->header.msg_len = sizeof(*scr);
+		p = scr->p + sizeof(scr->p) - long_len;
+		q = scr->q + sizeof(scr->q) - short_len;
+		dp = scr->dp + sizeof(scr->dp) - long_len;
+		dq = scr->dq + sizeof(scr->dq) - short_len;
+		u = scr->u + sizeof(scr->u) - long_len;
+		inp = scr->message + sizeof(scr->message) - mod_len;
+	} else {
+		struct type4_lcr *lcr = ap_msg->message;
+		memset(lcr, 0, sizeof(*lcr));
+		ap_msg->length = sizeof(*lcr);
+		lcr->header.msg_type_code = TYPE4_TYPE_CODE;
+		lcr->header.request_code = TYPE4_REQU_CODE;
+		lcr->header.msg_fmt = TYPE4_LCR_FMT;
+		lcr->header.msg_len = sizeof(*lcr);
+		p = lcr->p + sizeof(lcr->p) - long_len;
+		q = lcr->q + sizeof(lcr->q) - short_len;
+		dp = lcr->dp + sizeof(lcr->dp) - long_len;
+		dq = lcr->dq + sizeof(lcr->dq) - short_len;
+		u = lcr->u + sizeof(lcr->u) - long_len;
+		inp = lcr->message + sizeof(lcr->message) - mod_len;
+	}
+
+	if (copy_from_user(p, crt->np_prime, long_len) ||
+	    copy_from_user(q, crt->nq_prime, short_len) ||
+	    copy_from_user(dp, crt->bp_key, long_len) ||
+	    copy_from_user(dq, crt->bq_key, short_len) ||
+	    copy_from_user(u, crt->u_mult_inv, long_len) ||
+	    copy_from_user(inp, crt->inputdata, mod_len))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * Copy results from a type 84 reply message back to user space.
+ *
+ * @zdev: crypto device pointer
+ * @reply: reply AP message.
+ * @data: pointer to user output data
+ * @length: size of user output data
+ *
+ * Returns 0 on success or -EFAULT.
+ */
+static inline int convert_type84(struct zcrypt_device *zdev,
+				 struct ap_message *reply,
+				 char __user *outputdata,
+				 unsigned int outputdatalength)
+{
+	struct type84_hdr *t84h = reply->message;
+	char *data;
+
+	if (t84h->len < sizeof(*t84h) + outputdatalength) {
+		/* The result is too short, the PCICA card may not do that.. */
+		zdev->online = 0;
+		return -EAGAIN;	/* repeat the request on a different device. */
+	}
+	BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE);
+	data = reply->message + t84h->len - outputdatalength;
+	if (copy_to_user(outputdata, data, outputdatalength))
+		return -EFAULT;
+	return 0;
+}
+
+static int convert_response(struct zcrypt_device *zdev,
+			    struct ap_message *reply,
+			    char __user *outputdata,
+			    unsigned int outputdatalength)
+{
+	/* Response type byte is the second byte in the response. */
+	switch (((unsigned char *) reply->message)[1]) {
+	case TYPE82_RSP_CODE:
+	case TYPE88_RSP_CODE:
+		return convert_error(zdev, reply);
+	case TYPE84_RSP_CODE:
+		return convert_type84(zdev, reply,
+				      outputdata, outputdatalength);
+	default: /* Unknown response type, this should NEVER EVER happen */
+		PRINTK("Unrecognized Message Header: %08x%08x\n",
+		       *(unsigned int *) reply->message,
+		       *(unsigned int *) (reply->message+4));
+		zdev->online = 0;
+		return -EAGAIN;	/* repeat the request on a different device. */
+	}
+}
+
+/**
+ * This function is called from the AP bus code after a crypto request
+ * "msg" has finished with the reply message "reply".
+ * It is called from tasklet context.
+ * @ap_dev: pointer to the AP device
+ * @msg: pointer to the AP message
+ * @reply: pointer to the AP reply message
+ */
+static void zcrypt_pcica_receive(struct ap_device *ap_dev,
+				 struct ap_message *msg,
+				 struct ap_message *reply)
+{
+	static struct error_hdr error_reply = {
+		.type = TYPE82_RSP_CODE,
+		.reply_code = REP82_ERROR_MACHINE_FAILURE,
+	};
+	struct type84_hdr *t84h = reply->message;
+	int length;
+
+	/* Copy the reply message to the request message buffer. */
+	if (IS_ERR(reply))
+		memcpy(msg->message, &error_reply, sizeof(error_reply));
+	else if (t84h->code == TYPE84_RSP_CODE) {
+		length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len);
+		memcpy(msg->message, reply->message, length);
+	} else
+		memcpy(msg->message, reply->message, sizeof error_reply);
+	complete((struct completion *) msg->private);
+}
+
+static atomic_t zcrypt_step = ATOMIC_INIT(0);
+
+/**
+ * The request distributor calls this function if it picked the PCICA
+ * device to handle a modexpo request.
+ * @zdev: pointer to zcrypt_device structure that identifies the
+ *	  PCICA device to the request distributor
+ * @mex: pointer to the modexpo request buffer
+ */
+static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev,
+				 struct ica_rsa_modexpo *mex)
+{
+	struct ap_message ap_msg;
+	struct completion work;
+	int rc;
+
+	ap_msg.message = (void *) kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
+	if (!ap_msg.message)
+		return -ENOMEM;
+	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
+				atomic_inc_return(&zcrypt_step);
+	ap_msg.private = &work;
+	rc = ICAMEX_msg_to_type4MEX_msg(zdev, &ap_msg, mex);
+	if (rc)
+		goto out_free;
+	init_completion(&work);
+	ap_queue_message(zdev->ap_dev, &ap_msg);
+	rc = wait_for_completion_interruptible_timeout(
+				&work, PCICA_CLEANUP_TIME);
+	if (rc > 0)
+		rc = convert_response(zdev, &ap_msg, mex->outputdata,
+				      mex->outputdatalength);
+	else {
+		/* Signal pending or message timed out. */
+		ap_cancel_message(zdev->ap_dev, &ap_msg);
+		if (rc == 0)
+			/* Message timed out. */
+			rc = -ETIME;
+	}
+out_free:
+	kfree(ap_msg.message);
+	return rc;
+}
+
+/**
+ * The request distributor calls this function if it picked the PCICA
+ * device to handle a modexpo_crt request.
+ * @zdev: pointer to zcrypt_device structure that identifies the
+ *	  PCICA device to the request distributor
+ * @crt: pointer to the modexpoc_crt request buffer
+ */
+static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev,
+				     struct ica_rsa_modexpo_crt *crt)
+{
+	struct ap_message ap_msg;
+	struct completion work;
+	int rc;
+
+	ap_msg.message = (void *) kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
+	if (!ap_msg.message)
+		return -ENOMEM;
+	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
+				atomic_inc_return(&zcrypt_step);
+	ap_msg.private = &work;
+	rc = ICACRT_msg_to_type4CRT_msg(zdev, &ap_msg, crt);
+	if (rc)
+		goto out_free;
+	init_completion(&work);
+	ap_queue_message(zdev->ap_dev, &ap_msg);
+	rc = wait_for_completion_interruptible_timeout(
+				&work, PCICA_CLEANUP_TIME);
+	if (rc > 0)
+		rc = convert_response(zdev, &ap_msg, crt->outputdata,
+				      crt->outputdatalength);
+	else {
+		/* Signal pending or message timed out. */
+		ap_cancel_message(zdev->ap_dev, &ap_msg);
+		if (rc == 0)
+			/* Message timed out. */
+			rc = -ETIME;
+	}
+out_free:
+	kfree(ap_msg.message);
+	return rc;
+}
+
+/**
+ * The crypto operations for a PCICA card.
+ */
+static struct zcrypt_ops zcrypt_pcica_ops = {
+	.rsa_modexpo = zcrypt_pcica_modexpo,
+	.rsa_modexpo_crt = zcrypt_pcica_modexpo_crt,
+};
+
+/**
+ * Probe function for PCICA 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_pcica_probe(struct ap_device *ap_dev)
+{
+	struct zcrypt_device *zdev;
+	int rc;
+
+	zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE);
+	if (!zdev)
+		return -ENOMEM;
+	zdev->ap_dev = ap_dev;
+	zdev->ops = &zcrypt_pcica_ops;
+	zdev->online = 1;
+	zdev->user_space_type = ZCRYPT_PCICA;
+	zdev->type_string = "PCICA";
+	zdev->min_mod_size = PCICA_MIN_MOD_SIZE;
+	zdev->max_mod_size = PCICA_MAX_MOD_SIZE;
+	zdev->speed_rating = PCICA_SPEED_RATING;
+	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_device_free(zdev);
+	return rc;
+}
+
+/**
+ * This is called to remove the extended PCICA driver information
+ * if an AP device is removed.
+ */
+static void zcrypt_pcica_remove(struct ap_device *ap_dev)
+{
+	struct zcrypt_device *zdev = ap_dev->private;
+
+	zcrypt_device_unregister(zdev);
+}
+
+int __init zcrypt_pcica_init(void)
+{
+	return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica");
+}
+
+void zcrypt_pcica_exit(void)
+{
+	ap_driver_unregister(&zcrypt_pcica_driver);
+}
+
+#ifndef CONFIG_ZCRYPT_MONOLITHIC
+module_init(zcrypt_pcica_init);
+module_exit(zcrypt_pcica_exit);
+#endif