Initial import

1 files changed, 1489 insertions, 0 deletions

diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
new file mode 100644
index 000000000..08f1830cb
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -0,0 +1,1489 @@
+/*
+ *  zcrypt 2.1.0
+ *
+ *  Copyright IBM Corp. 2001, 2012
+ *  Author(s): Robert Burroughs
+ *	       Eric Rossman (edrossma@us.ibm.com)
+ *	       Cornelia Huck <cornelia.huck@de.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/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/compat.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <asm/uaccess.h>
+#include <linux/hw_random.h>
+#include <linux/debugfs.h>
+#include <asm/debug.h>
+
+#include "zcrypt_debug.h"
+#include "zcrypt_api.h"
+
+#include "zcrypt_msgtype6.h"
+
+/*
+ * Module description.
+ */
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
+		   "Copyright IBM Corp. 2001, 2012");
+MODULE_LICENSE("GPL");
+
+static DEFINE_SPINLOCK(zcrypt_device_lock);
+static LIST_HEAD(zcrypt_device_list);
+static int zcrypt_device_count = 0;
+static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
+static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
+
+atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
+EXPORT_SYMBOL(zcrypt_rescan_req);
+
+static int zcrypt_rng_device_add(void);
+static void zcrypt_rng_device_remove(void);
+
+static DEFINE_SPINLOCK(zcrypt_ops_list_lock);
+static LIST_HEAD(zcrypt_ops_list);
+
+static debug_info_t *zcrypt_dbf_common;
+static debug_info_t *zcrypt_dbf_devices;
+static struct dentry *debugfs_root;
+
+/*
+ * Device attributes common for all crypto devices.
+ */
+static ssize_t zcrypt_type_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
+	return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
+}
+
+static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
+
+static ssize_t zcrypt_online_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
+	return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
+}
+
+static ssize_t zcrypt_online_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t count)
+{
+	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
+	int online;
+
+	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
+		return -EINVAL;
+	zdev->online = online;
+	ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dman", zdev->ap_dev->qid,
+		       zdev->online);
+	if (!online)
+		ap_flush_queue(zdev->ap_dev);
+	return count;
+}
+
+static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
+
+static struct attribute * zcrypt_device_attrs[] = {
+	&dev_attr_type.attr,
+	&dev_attr_online.attr,
+	NULL,
+};
+
+static struct attribute_group zcrypt_device_attr_group = {
+	.attrs = zcrypt_device_attrs,
+};
+
+/**
+ * Process a rescan of the transport layer.
+ *
+ * Returns 1, if the rescan has been processed, otherwise 0.
+ */
+static inline int zcrypt_process_rescan(void)
+{
+	if (atomic_read(&zcrypt_rescan_req)) {
+		atomic_set(&zcrypt_rescan_req, 0);
+		atomic_inc(&zcrypt_rescan_count);
+		ap_bus_force_rescan();
+		ZCRYPT_DBF_COMMON(DBF_INFO, "rescan%07d",
+				  atomic_inc_return(&zcrypt_rescan_count));
+		return 1;
+	}
+	return 0;
+}
+
+/**
+ * __zcrypt_increase_preference(): Increase preference of a crypto device.
+ * @zdev: Pointer the crypto device
+ *
+ * Move the device towards the head of the device list.
+ * Need to be called while holding the zcrypt device list lock.
+ * Note: cards with speed_rating of 0 are kept at the end of the list.
+ */
+static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
+{
+	struct zcrypt_device *tmp;
+	struct list_head *l;
+
+	if (zdev->speed_rating == 0)
+		return;
+	for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
+		tmp = list_entry(l, struct zcrypt_device, list);
+		if ((tmp->request_count + 1) * tmp->speed_rating <=
+		    (zdev->request_count + 1) * zdev->speed_rating &&
+		    tmp->speed_rating != 0)
+			break;
+	}
+	if (l == zdev->list.prev)
+		return;
+	/* Move zdev behind l */
+	list_move(&zdev->list, l);
+}
+
+/**
+ * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
+ * @zdev: Pointer to a crypto device.
+ *
+ * Move the device towards the tail of the device list.
+ * Need to be called while holding the zcrypt device list lock.
+ * Note: cards with speed_rating of 0 are kept at the end of the list.
+ */
+static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
+{
+	struct zcrypt_device *tmp;
+	struct list_head *l;
+
+	if (zdev->speed_rating == 0)
+		return;
+	for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
+		tmp = list_entry(l, struct zcrypt_device, list);
+		if ((tmp->request_count + 1) * tmp->speed_rating >
+		    (zdev->request_count + 1) * zdev->speed_rating ||
+		    tmp->speed_rating == 0)
+			break;
+	}
+	if (l == zdev->list.next)
+		return;
+	/* Move zdev before l */
+	list_move_tail(&zdev->list, l);
+}
+
+static void zcrypt_device_release(struct kref *kref)
+{
+	struct zcrypt_device *zdev =
+		container_of(kref, struct zcrypt_device, refcount);
+	zcrypt_device_free(zdev);
+}
+
+void zcrypt_device_get(struct zcrypt_device *zdev)
+{
+	kref_get(&zdev->refcount);
+}
+EXPORT_SYMBOL(zcrypt_device_get);
+
+int zcrypt_device_put(struct zcrypt_device *zdev)
+{
+	return kref_put(&zdev->refcount, zcrypt_device_release);
+}
+EXPORT_SYMBOL(zcrypt_device_put);
+
+struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
+{
+	struct zcrypt_device *zdev;
+
+	zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
+	if (!zdev)
+		return NULL;
+	zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
+	if (!zdev->reply.message)
+		goto out_free;
+	zdev->reply.length = max_response_size;
+	spin_lock_init(&zdev->lock);
+	INIT_LIST_HEAD(&zdev->list);
+	zdev->dbf_area = zcrypt_dbf_devices;
+	return zdev;
+
+out_free:
+	kfree(zdev);
+	return NULL;
+}
+EXPORT_SYMBOL(zcrypt_device_alloc);
+
+void zcrypt_device_free(struct zcrypt_device *zdev)
+{
+	kfree(zdev->reply.message);
+	kfree(zdev);
+}
+EXPORT_SYMBOL(zcrypt_device_free);
+
+/**
+ * zcrypt_device_register() - Register a crypto device.
+ * @zdev: Pointer to a crypto device
+ *
+ * Register a crypto device. Returns 0 if successful.
+ */
+int zcrypt_device_register(struct zcrypt_device *zdev)
+{
+	int rc;
+
+	if (!zdev->ops)
+		return -ENODEV;
+	rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
+				&zcrypt_device_attr_group);
+	if (rc)
+		goto out;
+	get_device(&zdev->ap_dev->device);
+	kref_init(&zdev->refcount);
+	spin_lock_bh(&zcrypt_device_lock);
+	zdev->online = 1;	/* New devices are online by default. */
+	ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dreg", zdev->ap_dev->qid,
+		       zdev->online);
+	list_add_tail(&zdev->list, &zcrypt_device_list);
+	__zcrypt_increase_preference(zdev);
+	zcrypt_device_count++;
+	spin_unlock_bh(&zcrypt_device_lock);
+	if (zdev->ops->rng) {
+		rc = zcrypt_rng_device_add();
+		if (rc)
+			goto out_unregister;
+	}
+	return 0;
+
+out_unregister:
+	spin_lock_bh(&zcrypt_device_lock);
+	zcrypt_device_count--;
+	list_del_init(&zdev->list);
+	spin_unlock_bh(&zcrypt_device_lock);
+	sysfs_remove_group(&zdev->ap_dev->device.kobj,
+			   &zcrypt_device_attr_group);
+	put_device(&zdev->ap_dev->device);
+	zcrypt_device_put(zdev);
+out:
+	return rc;
+}
+EXPORT_SYMBOL(zcrypt_device_register);
+
+/**
+ * zcrypt_device_unregister(): Unregister a crypto device.
+ * @zdev: Pointer to crypto device
+ *
+ * Unregister a crypto device.
+ */
+void zcrypt_device_unregister(struct zcrypt_device *zdev)
+{
+	if (zdev->ops->rng)
+		zcrypt_rng_device_remove();
+	spin_lock_bh(&zcrypt_device_lock);
+	zcrypt_device_count--;
+	list_del_init(&zdev->list);
+	spin_unlock_bh(&zcrypt_device_lock);
+	sysfs_remove_group(&zdev->ap_dev->device.kobj,
+			   &zcrypt_device_attr_group);
+	put_device(&zdev->ap_dev->device);
+	zcrypt_device_put(zdev);
+}
+EXPORT_SYMBOL(zcrypt_device_unregister);
+
+void zcrypt_msgtype_register(struct zcrypt_ops *zops)
+{
+	if (zops->owner) {
+		spin_lock_bh(&zcrypt_ops_list_lock);
+		list_add_tail(&zops->list, &zcrypt_ops_list);
+		spin_unlock_bh(&zcrypt_ops_list_lock);
+	}
+}
+EXPORT_SYMBOL(zcrypt_msgtype_register);
+
+void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
+{
+	spin_lock_bh(&zcrypt_ops_list_lock);
+	list_del_init(&zops->list);
+	spin_unlock_bh(&zcrypt_ops_list_lock);
+}
+EXPORT_SYMBOL(zcrypt_msgtype_unregister);
+
+static inline
+struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant)
+{
+	struct zcrypt_ops *zops;
+	int found = 0;
+
+	spin_lock_bh(&zcrypt_ops_list_lock);
+	list_for_each_entry(zops, &zcrypt_ops_list, list) {
+		if ((zops->variant == variant) &&
+		    (!strncmp(zops->owner->name, name, MODULE_NAME_LEN))) {
+			found = 1;
+			break;
+		}
+	}
+	if (!found || !try_module_get(zops->owner))
+		zops = NULL;
+
+	spin_unlock_bh(&zcrypt_ops_list_lock);
+
+	return zops;
+}
+
+struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant)
+{
+	struct zcrypt_ops *zops = NULL;
+
+	zops = __ops_lookup(name, variant);
+	if (!zops) {
+		request_module("%s", name);
+		zops = __ops_lookup(name, variant);
+	}
+	return zops;
+}
+EXPORT_SYMBOL(zcrypt_msgtype_request);
+
+void zcrypt_msgtype_release(struct zcrypt_ops *zops)
+{
+	if (zops)
+		module_put(zops->owner);
+}
+EXPORT_SYMBOL(zcrypt_msgtype_release);
+
+/**
+ * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
+ *
+ * This function is not supported beyond zcrypt 1.3.1.
+ */
+static ssize_t zcrypt_read(struct file *filp, char __user *buf,
+			   size_t count, loff_t *f_pos)
+{
+	return -EPERM;
+}
+
+/**
+ * zcrypt_write(): Not allowed.
+ *
+ * Write is is not allowed
+ */
+static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
+			    size_t count, loff_t *f_pos)
+{
+	return -EPERM;
+}
+
+/**
+ * zcrypt_open(): Count number of users.
+ *
+ * Device open function to count number of users.
+ */
+static int zcrypt_open(struct inode *inode, struct file *filp)
+{
+	atomic_inc(&zcrypt_open_count);
+	return nonseekable_open(inode, filp);
+}
+
+/**
+ * zcrypt_release(): Count number of users.
+ *
+ * Device close function to count number of users.
+ */
+static int zcrypt_release(struct inode *inode, struct file *filp)
+{
+	atomic_dec(&zcrypt_open_count);
+	return 0;
+}
+
+/*
+ * zcrypt ioctls.
+ */
+static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
+{
+	struct zcrypt_device *zdev;
+	int rc;
+
+	if (mex->outputdatalength < mex->inputdatalength)
+		return -EINVAL;
+	/*
+	 * As long as outputdatalength is big enough, we can set the
+	 * outputdatalength equal to the inputdatalength, since that is the
+	 * number of bytes we will copy in any case
+	 */
+	mex->outputdatalength = mex->inputdatalength;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		if (!zdev->online ||
+		    !zdev->ops->rsa_modexpo ||
+		    zdev->min_mod_size > mex->inputdatalength ||
+		    zdev->max_mod_size < mex->inputdatalength)
+			continue;
+		zcrypt_device_get(zdev);
+		get_device(&zdev->ap_dev->device);
+		zdev->request_count++;
+		__zcrypt_decrease_preference(zdev);
+		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
+			spin_unlock_bh(&zcrypt_device_lock);
+			rc = zdev->ops->rsa_modexpo(zdev, mex);
+			spin_lock_bh(&zcrypt_device_lock);
+			module_put(zdev->ap_dev->drv->driver.owner);
+		}
+		else
+			rc = -EAGAIN;
+		zdev->request_count--;
+		__zcrypt_increase_preference(zdev);
+		put_device(&zdev->ap_dev->device);
+		zcrypt_device_put(zdev);
+		spin_unlock_bh(&zcrypt_device_lock);
+		return rc;
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return -ENODEV;
+}
+
+static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
+{
+	struct zcrypt_device *zdev;
+	unsigned long long z1, z2, z3;
+	int rc, copied;
+
+	if (crt->outputdatalength < crt->inputdatalength ||
+	    (crt->inputdatalength & 1))
+		return -EINVAL;
+	/*
+	 * As long as outputdatalength is big enough, we can set the
+	 * outputdatalength equal to the inputdatalength, since that is the
+	 * number of bytes we will copy in any case
+	 */
+	crt->outputdatalength = crt->inputdatalength;
+
+	copied = 0;
+ restart:
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		if (!zdev->online ||
+		    !zdev->ops->rsa_modexpo_crt ||
+		    zdev->min_mod_size > crt->inputdatalength ||
+		    zdev->max_mod_size < crt->inputdatalength)
+			continue;
+		if (zdev->short_crt && crt->inputdatalength > 240) {
+			/*
+			 * Check inputdata for leading zeros for cards
+			 * that can't handle np_prime, bp_key, or
+			 * u_mult_inv > 128 bytes.
+			 */
+			if (copied == 0) {
+				unsigned int len;
+				spin_unlock_bh(&zcrypt_device_lock);
+				/* len is max 256 / 2 - 120 = 8
+				 * For bigger device just assume len of leading
+				 * 0s is 8 as stated in the requirements for
+				 * ica_rsa_modexpo_crt struct in zcrypt.h.
+				 */
+				if (crt->inputdatalength <= 256)
+					len = crt->inputdatalength / 2 - 120;
+				else
+					len = 8;
+				if (len > sizeof(z1))
+					return -EFAULT;
+				z1 = z2 = z3 = 0;
+				if (copy_from_user(&z1, crt->np_prime, len) ||
+				    copy_from_user(&z2, crt->bp_key, len) ||
+				    copy_from_user(&z3, crt->u_mult_inv, len))
+					return -EFAULT;
+				z1 = z2 = z3 = 0;
+				copied = 1;
+				/*
+				 * We have to restart device lookup -
+				 * the device list may have changed by now.
+				 */
+				goto restart;
+			}
+			if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
+				/* The device can't handle this request. */
+				continue;
+		}
+		zcrypt_device_get(zdev);
+		get_device(&zdev->ap_dev->device);
+		zdev->request_count++;
+		__zcrypt_decrease_preference(zdev);
+		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
+			spin_unlock_bh(&zcrypt_device_lock);
+			rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
+			spin_lock_bh(&zcrypt_device_lock);
+			module_put(zdev->ap_dev->drv->driver.owner);
+		}
+		else
+			rc = -EAGAIN;
+		zdev->request_count--;
+		__zcrypt_increase_preference(zdev);
+		put_device(&zdev->ap_dev->device);
+		zcrypt_device_put(zdev);
+		spin_unlock_bh(&zcrypt_device_lock);
+		return rc;
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return -ENODEV;
+}
+
+static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
+{
+	struct zcrypt_device *zdev;
+	int rc;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		if (!zdev->online || !zdev->ops->send_cprb ||
+		   (zdev->ops->variant == MSGTYPE06_VARIANT_EP11) ||
+		   (xcRB->user_defined != AUTOSELECT &&
+		    AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined))
+			continue;
+		zcrypt_device_get(zdev);
+		get_device(&zdev->ap_dev->device);
+		zdev->request_count++;
+		__zcrypt_decrease_preference(zdev);
+		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
+			spin_unlock_bh(&zcrypt_device_lock);
+			rc = zdev->ops->send_cprb(zdev, xcRB);
+			spin_lock_bh(&zcrypt_device_lock);
+			module_put(zdev->ap_dev->drv->driver.owner);
+		}
+		else
+			rc = -EAGAIN;
+		zdev->request_count--;
+		__zcrypt_increase_preference(zdev);
+		put_device(&zdev->ap_dev->device);
+		zcrypt_device_put(zdev);
+		spin_unlock_bh(&zcrypt_device_lock);
+		return rc;
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return -ENODEV;
+}
+
+struct ep11_target_dev_list {
+	unsigned short		targets_num;
+	struct ep11_target_dev	*targets;
+};
+
+static bool is_desired_ep11dev(unsigned int dev_qid,
+			       struct ep11_target_dev_list dev_list)
+{
+	int n;
+
+	for (n = 0; n < dev_list.targets_num; n++, dev_list.targets++) {
+		if ((AP_QID_DEVICE(dev_qid) == dev_list.targets->ap_id) &&
+		    (AP_QID_QUEUE(dev_qid) == dev_list.targets->dom_id)) {
+			return true;
+		}
+	}
+	return false;
+}
+
+static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
+{
+	struct zcrypt_device *zdev;
+	bool autoselect = false;
+	int rc;
+	struct ep11_target_dev_list ep11_dev_list = {
+		.targets_num	=  0x00,
+		.targets	=  NULL,
+	};
+
+	ep11_dev_list.targets_num = (unsigned short) xcrb->targets_num;
+
+	/* empty list indicates autoselect (all available targets) */
+	if (ep11_dev_list.targets_num == 0)
+		autoselect = true;
+	else {
+		ep11_dev_list.targets = kcalloc((unsigned short)
+						xcrb->targets_num,
+						sizeof(struct ep11_target_dev),
+						GFP_KERNEL);
+		if (!ep11_dev_list.targets)
+			return -ENOMEM;
+
+		if (copy_from_user(ep11_dev_list.targets,
+				   (struct ep11_target_dev __force __user *)
+				   xcrb->targets, xcrb->targets_num *
+				   sizeof(struct ep11_target_dev)))
+			return -EFAULT;
+	}
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		/* check if device is eligible */
+		if (!zdev->online ||
+		    zdev->ops->variant != MSGTYPE06_VARIANT_EP11)
+			continue;
+
+		/* check if device is selected as valid target */
+		if (!is_desired_ep11dev(zdev->ap_dev->qid, ep11_dev_list) &&
+		    !autoselect)
+			continue;
+
+		zcrypt_device_get(zdev);
+		get_device(&zdev->ap_dev->device);
+		zdev->request_count++;
+		__zcrypt_decrease_preference(zdev);
+		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
+			spin_unlock_bh(&zcrypt_device_lock);
+			rc = zdev->ops->send_ep11_cprb(zdev, xcrb);
+			spin_lock_bh(&zcrypt_device_lock);
+			module_put(zdev->ap_dev->drv->driver.owner);
+		} else {
+			rc = -EAGAIN;
+		  }
+		zdev->request_count--;
+		__zcrypt_increase_preference(zdev);
+		put_device(&zdev->ap_dev->device);
+		zcrypt_device_put(zdev);
+		spin_unlock_bh(&zcrypt_device_lock);
+		return rc;
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return -ENODEV;
+}
+
+static long zcrypt_rng(char *buffer)
+{
+	struct zcrypt_device *zdev;
+	int rc;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		if (!zdev->online || !zdev->ops->rng)
+			continue;
+		zcrypt_device_get(zdev);
+		get_device(&zdev->ap_dev->device);
+		zdev->request_count++;
+		__zcrypt_decrease_preference(zdev);
+		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
+			spin_unlock_bh(&zcrypt_device_lock);
+			rc = zdev->ops->rng(zdev, buffer);
+			spin_lock_bh(&zcrypt_device_lock);
+			module_put(zdev->ap_dev->drv->driver.owner);
+		} else
+			rc = -EAGAIN;
+		zdev->request_count--;
+		__zcrypt_increase_preference(zdev);
+		put_device(&zdev->ap_dev->device);
+		zcrypt_device_put(zdev);
+		spin_unlock_bh(&zcrypt_device_lock);
+		return rc;
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return -ENODEV;
+}
+
+static void zcrypt_status_mask(char status[AP_DEVICES])
+{
+	struct zcrypt_device *zdev;
+
+	memset(status, 0, sizeof(char) * AP_DEVICES);
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list)
+		status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
+			zdev->online ? zdev->user_space_type : 0x0d;
+	spin_unlock_bh(&zcrypt_device_lock);
+}
+
+static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
+{
+	struct zcrypt_device *zdev;
+
+	memset(qdepth, 0, sizeof(char)	* AP_DEVICES);
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		spin_lock(&zdev->ap_dev->lock);
+		qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
+			zdev->ap_dev->pendingq_count +
+			zdev->ap_dev->requestq_count;
+		spin_unlock(&zdev->ap_dev->lock);
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+}
+
+static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
+{
+	struct zcrypt_device *zdev;
+
+	memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		spin_lock(&zdev->ap_dev->lock);
+		reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
+			zdev->ap_dev->total_request_count;
+		spin_unlock(&zdev->ap_dev->lock);
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+}
+
+static int zcrypt_pendingq_count(void)
+{
+	struct zcrypt_device *zdev;
+	int pendingq_count = 0;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		spin_lock(&zdev->ap_dev->lock);
+		pendingq_count += zdev->ap_dev->pendingq_count;
+		spin_unlock(&zdev->ap_dev->lock);
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return pendingq_count;
+}
+
+static int zcrypt_requestq_count(void)
+{
+	struct zcrypt_device *zdev;
+	int requestq_count = 0;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list) {
+		spin_lock(&zdev->ap_dev->lock);
+		requestq_count += zdev->ap_dev->requestq_count;
+		spin_unlock(&zdev->ap_dev->lock);
+	}
+	spin_unlock_bh(&zcrypt_device_lock);
+	return requestq_count;
+}
+
+static int zcrypt_count_type(int type)
+{
+	struct zcrypt_device *zdev;
+	int device_count = 0;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list)
+		if (zdev->user_space_type == type)
+			device_count++;
+	spin_unlock_bh(&zcrypt_device_lock);
+	return device_count;
+}
+
+/**
+ * zcrypt_ica_status(): Old, depracted combi status call.
+ *
+ * Old, deprecated combi status call.
+ */
+static long zcrypt_ica_status(struct file *filp, unsigned long arg)
+{
+	struct ica_z90_status *pstat;
+	int ret;
+
+	pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
+	if (!pstat)
+		return -ENOMEM;
+	pstat->totalcount = zcrypt_device_count;
+	pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
+	pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
+	pstat->requestqWaitCount = zcrypt_requestq_count();
+	pstat->pendingqWaitCount = zcrypt_pendingq_count();
+	pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
+	pstat->cryptoDomain = ap_domain_index;
+	zcrypt_status_mask(pstat->status);
+	zcrypt_qdepth_mask(pstat->qdepth);
+	ret = 0;
+	if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
+		ret = -EFAULT;
+	kfree(pstat);
+	return ret;
+}
+
+static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
+				  unsigned long arg)
+{
+	int rc;
+
+	switch (cmd) {
+	case ICARSAMODEXPO: {
+		struct ica_rsa_modexpo __user *umex = (void __user *) arg;
+		struct ica_rsa_modexpo mex;
+		if (copy_from_user(&mex, umex, sizeof(mex)))
+			return -EFAULT;
+		do {
+			rc = zcrypt_rsa_modexpo(&mex);
+		} while (rc == -EAGAIN);
+		/* on failure: retry once again after a requested rescan */
+		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+			do {
+				rc = zcrypt_rsa_modexpo(&mex);
+			} while (rc == -EAGAIN);
+		if (rc)
+			return rc;
+		return put_user(mex.outputdatalength, &umex->outputdatalength);
+	}
+	case ICARSACRT: {
+		struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
+		struct ica_rsa_modexpo_crt crt;
+		if (copy_from_user(&crt, ucrt, sizeof(crt)))
+			return -EFAULT;
+		do {
+			rc = zcrypt_rsa_crt(&crt);
+		} while (rc == -EAGAIN);
+		/* on failure: retry once again after a requested rescan */
+		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+			do {
+				rc = zcrypt_rsa_crt(&crt);
+			} while (rc == -EAGAIN);
+		if (rc)
+			return rc;
+		return put_user(crt.outputdatalength, &ucrt->outputdatalength);
+	}
+	case ZSECSENDCPRB: {
+		struct ica_xcRB __user *uxcRB = (void __user *) arg;
+		struct ica_xcRB xcRB;
+		if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
+			return -EFAULT;
+		do {
+			rc = zcrypt_send_cprb(&xcRB);
+		} while (rc == -EAGAIN);
+		/* on failure: retry once again after a requested rescan */
+		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+			do {
+				rc = zcrypt_send_cprb(&xcRB);
+			} while (rc == -EAGAIN);
+		if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
+			return -EFAULT;
+		return rc;
+	}
+	case ZSENDEP11CPRB: {
+		struct ep11_urb __user *uxcrb = (void __user *)arg;
+		struct ep11_urb xcrb;
+		if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
+			return -EFAULT;
+		do {
+			rc = zcrypt_send_ep11_cprb(&xcrb);
+		} while (rc == -EAGAIN);
+		/* on failure: retry once again after a requested rescan */
+		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+			do {
+				rc = zcrypt_send_ep11_cprb(&xcrb);
+			} while (rc == -EAGAIN);
+		if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
+			return -EFAULT;
+		return rc;
+	}
+	case Z90STAT_STATUS_MASK: {
+		char status[AP_DEVICES];
+		zcrypt_status_mask(status);
+		if (copy_to_user((char __user *) arg, status,
+				 sizeof(char) * AP_DEVICES))
+			return -EFAULT;
+		return 0;
+	}
+	case Z90STAT_QDEPTH_MASK: {
+		char qdepth[AP_DEVICES];
+		zcrypt_qdepth_mask(qdepth);
+		if (copy_to_user((char __user *) arg, qdepth,
+				 sizeof(char) * AP_DEVICES))
+			return -EFAULT;
+		return 0;
+	}
+	case Z90STAT_PERDEV_REQCNT: {
+		int reqcnt[AP_DEVICES];
+		zcrypt_perdev_reqcnt(reqcnt);
+		if (copy_to_user((int __user *) arg, reqcnt,
+				 sizeof(int) * AP_DEVICES))
+			return -EFAULT;
+		return 0;
+	}
+	case Z90STAT_REQUESTQ_COUNT:
+		return put_user(zcrypt_requestq_count(), (int __user *) arg);
+	case Z90STAT_PENDINGQ_COUNT:
+		return put_user(zcrypt_pendingq_count(), (int __user *) arg);
+	case Z90STAT_TOTALOPEN_COUNT:
+		return put_user(atomic_read(&zcrypt_open_count),
+				(int __user *) arg);
+	case Z90STAT_DOMAIN_INDEX:
+		return put_user(ap_domain_index, (int __user *) arg);
+	/*
+	 * Deprecated ioctls. Don't add another device count ioctl,
+	 * you can count them yourself in the user space with the
+	 * output of the Z90STAT_STATUS_MASK ioctl.
+	 */
+	case ICAZ90STATUS:
+		return zcrypt_ica_status(filp, arg);
+	case Z90STAT_TOTALCOUNT:
+		return put_user(zcrypt_device_count, (int __user *) arg);
+	case Z90STAT_PCICACOUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_PCICA),
+				(int __user *) arg);
+	case Z90STAT_PCICCCOUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_PCICC),
+				(int __user *) arg);
+	case Z90STAT_PCIXCCMCL2COUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
+				(int __user *) arg);
+	case Z90STAT_PCIXCCMCL3COUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
+				(int __user *) arg);
+	case Z90STAT_PCIXCCCOUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
+				zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
+				(int __user *) arg);
+	case Z90STAT_CEX2CCOUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
+				(int __user *) arg);
+	case Z90STAT_CEX2ACOUNT:
+		return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
+				(int __user *) arg);
+	default:
+		/* unknown ioctl number */
+		return -ENOIOCTLCMD;
+	}
+}
+
+#ifdef CONFIG_COMPAT
+/*
+ * ioctl32 conversion routines
+ */
+struct compat_ica_rsa_modexpo {
+	compat_uptr_t	inputdata;
+	unsigned int	inputdatalength;
+	compat_uptr_t	outputdata;
+	unsigned int	outputdatalength;
+	compat_uptr_t	b_key;
+	compat_uptr_t	n_modulus;
+};
+
+static long trans_modexpo32(struct file *filp, unsigned int cmd,
+			    unsigned long arg)
+{
+	struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
+	struct compat_ica_rsa_modexpo mex32;
+	struct ica_rsa_modexpo mex64;
+	long rc;
+
+	if (copy_from_user(&mex32, umex32, sizeof(mex32)))
+		return -EFAULT;
+	mex64.inputdata = compat_ptr(mex32.inputdata);
+	mex64.inputdatalength = mex32.inputdatalength;
+	mex64.outputdata = compat_ptr(mex32.outputdata);
+	mex64.outputdatalength = mex32.outputdatalength;
+	mex64.b_key = compat_ptr(mex32.b_key);
+	mex64.n_modulus = compat_ptr(mex32.n_modulus);
+	do {
+		rc = zcrypt_rsa_modexpo(&mex64);
+	} while (rc == -EAGAIN);
+	/* on failure: retry once again after a requested rescan */
+	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+		do {
+			rc = zcrypt_rsa_modexpo(&mex64);
+		} while (rc == -EAGAIN);
+	if (rc)
+		return rc;
+	return put_user(mex64.outputdatalength,
+			&umex32->outputdatalength);
+}
+
+struct compat_ica_rsa_modexpo_crt {
+	compat_uptr_t	inputdata;
+	unsigned int	inputdatalength;
+	compat_uptr_t	outputdata;
+	unsigned int	outputdatalength;
+	compat_uptr_t	bp_key;
+	compat_uptr_t	bq_key;
+	compat_uptr_t	np_prime;
+	compat_uptr_t	nq_prime;
+	compat_uptr_t	u_mult_inv;
+};
+
+static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
+				unsigned long arg)
+{
+	struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
+	struct compat_ica_rsa_modexpo_crt crt32;
+	struct ica_rsa_modexpo_crt crt64;
+	long rc;
+
+	if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
+		return -EFAULT;
+	crt64.inputdata = compat_ptr(crt32.inputdata);
+	crt64.inputdatalength = crt32.inputdatalength;
+	crt64.outputdata=  compat_ptr(crt32.outputdata);
+	crt64.outputdatalength = crt32.outputdatalength;
+	crt64.bp_key = compat_ptr(crt32.bp_key);
+	crt64.bq_key = compat_ptr(crt32.bq_key);
+	crt64.np_prime = compat_ptr(crt32.np_prime);
+	crt64.nq_prime = compat_ptr(crt32.nq_prime);
+	crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
+	do {
+		rc = zcrypt_rsa_crt(&crt64);
+	} while (rc == -EAGAIN);
+	/* on failure: retry once again after a requested rescan */
+	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+		do {
+			rc = zcrypt_rsa_crt(&crt64);
+		} while (rc == -EAGAIN);
+	if (rc)
+		return rc;
+	return put_user(crt64.outputdatalength,
+			&ucrt32->outputdatalength);
+}
+
+struct compat_ica_xcRB {
+	unsigned short	agent_ID;
+	unsigned int	user_defined;
+	unsigned short	request_ID;
+	unsigned int	request_control_blk_length;
+	unsigned char	padding1[16 - sizeof (compat_uptr_t)];
+	compat_uptr_t	request_control_blk_addr;
+	unsigned int	request_data_length;
+	char		padding2[16 - sizeof (compat_uptr_t)];
+	compat_uptr_t	request_data_address;
+	unsigned int	reply_control_blk_length;
+	char		padding3[16 - sizeof (compat_uptr_t)];
+	compat_uptr_t	reply_control_blk_addr;
+	unsigned int	reply_data_length;
+	char		padding4[16 - sizeof (compat_uptr_t)];
+	compat_uptr_t	reply_data_addr;
+	unsigned short	priority_window;
+	unsigned int	status;
+} __attribute__((packed));
+
+static long trans_xcRB32(struct file *filp, unsigned int cmd,
+			 unsigned long arg)
+{
+	struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
+	struct compat_ica_xcRB xcRB32;
+	struct ica_xcRB xcRB64;
+	long rc;
+
+	if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
+		return -EFAULT;
+	xcRB64.agent_ID = xcRB32.agent_ID;
+	xcRB64.user_defined = xcRB32.user_defined;
+	xcRB64.request_ID = xcRB32.request_ID;
+	xcRB64.request_control_blk_length =
+		xcRB32.request_control_blk_length;
+	xcRB64.request_control_blk_addr =
+		compat_ptr(xcRB32.request_control_blk_addr);
+	xcRB64.request_data_length =
+		xcRB32.request_data_length;
+	xcRB64.request_data_address =
+		compat_ptr(xcRB32.request_data_address);
+	xcRB64.reply_control_blk_length =
+		xcRB32.reply_control_blk_length;
+	xcRB64.reply_control_blk_addr =
+		compat_ptr(xcRB32.reply_control_blk_addr);
+	xcRB64.reply_data_length = xcRB32.reply_data_length;
+	xcRB64.reply_data_addr =
+		compat_ptr(xcRB32.reply_data_addr);
+	xcRB64.priority_window = xcRB32.priority_window;
+	xcRB64.status = xcRB32.status;
+	do {
+		rc = zcrypt_send_cprb(&xcRB64);
+	} while (rc == -EAGAIN);
+	/* on failure: retry once again after a requested rescan */
+	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+		do {
+			rc = zcrypt_send_cprb(&xcRB64);
+		} while (rc == -EAGAIN);
+	xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
+	xcRB32.reply_data_length = xcRB64.reply_data_length;
+	xcRB32.status = xcRB64.status;
+	if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
+			return -EFAULT;
+	return rc;
+}
+
+static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
+			 unsigned long arg)
+{
+	if (cmd == ICARSAMODEXPO)
+		return trans_modexpo32(filp, cmd, arg);
+	if (cmd == ICARSACRT)
+		return trans_modexpo_crt32(filp, cmd, arg);
+	if (cmd == ZSECSENDCPRB)
+		return trans_xcRB32(filp, cmd, arg);
+	return zcrypt_unlocked_ioctl(filp, cmd, arg);
+}
+#endif
+
+/*
+ * Misc device file operations.
+ */
+static const struct file_operations zcrypt_fops = {
+	.owner		= THIS_MODULE,
+	.read		= zcrypt_read,
+	.write		= zcrypt_write,
+	.unlocked_ioctl	= zcrypt_unlocked_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= zcrypt_compat_ioctl,
+#endif
+	.open		= zcrypt_open,
+	.release	= zcrypt_release,
+	.llseek		= no_llseek,
+};
+
+/*
+ * Misc device.
+ */
+static struct miscdevice zcrypt_misc_device = {
+	.minor	    = MISC_DYNAMIC_MINOR,
+	.name	    = "z90crypt",
+	.fops	    = &zcrypt_fops,
+};
+
+/*
+ * Deprecated /proc entry support.
+ */
+static struct proc_dir_entry *zcrypt_entry;
+
+static void sprintcl(struct seq_file *m, unsigned char *addr, unsigned int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		seq_printf(m, "%01x", (unsigned int) addr[i]);
+	seq_putc(m, ' ');
+}
+
+static void sprintrw(struct seq_file *m, unsigned char *addr, unsigned int len)
+{
+	int inl, c, cx;
+
+	seq_printf(m, "	   ");
+	inl = 0;
+	for (c = 0; c < (len / 16); c++) {
+		sprintcl(m, addr+inl, 16);
+		inl += 16;
+	}
+	cx = len%16;
+	if (cx) {
+		sprintcl(m, addr+inl, cx);
+		inl += cx;
+	}
+	seq_putc(m, '\n');
+}
+
+static void sprinthx(unsigned char *title, struct seq_file *m,
+		     unsigned char *addr, unsigned int len)
+{
+	int inl, r, rx;
+
+	seq_printf(m, "\n%s\n", title);
+	inl = 0;
+	for (r = 0; r < (len / 64); r++) {
+		sprintrw(m, addr+inl, 64);
+		inl += 64;
+	}
+	rx = len % 64;
+	if (rx) {
+		sprintrw(m, addr+inl, rx);
+		inl += rx;
+	}
+	seq_putc(m, '\n');
+}
+
+static void sprinthx4(unsigned char *title, struct seq_file *m,
+		      unsigned int *array, unsigned int len)
+{
+	int r;
+
+	seq_printf(m, "\n%s\n", title);
+	for (r = 0; r < len; r++) {
+		if ((r % 8) == 0)
+			seq_printf(m, "    ");
+		seq_printf(m, "%08X ", array[r]);
+		if ((r % 8) == 7)
+			seq_putc(m, '\n');
+	}
+	seq_putc(m, '\n');
+}
+
+static int zcrypt_proc_show(struct seq_file *m, void *v)
+{
+	char workarea[sizeof(int) * AP_DEVICES];
+
+	seq_printf(m, "\nzcrypt version: %d.%d.%d\n",
+		   ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
+	seq_printf(m, "Cryptographic domain: %d\n", ap_domain_index);
+	seq_printf(m, "Total device count: %d\n", zcrypt_device_count);
+	seq_printf(m, "PCICA count: %d\n", zcrypt_count_type(ZCRYPT_PCICA));
+	seq_printf(m, "PCICC count: %d\n", zcrypt_count_type(ZCRYPT_PCICC));
+	seq_printf(m, "PCIXCC MCL2 count: %d\n",
+		   zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
+	seq_printf(m, "PCIXCC MCL3 count: %d\n",
+		   zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
+	seq_printf(m, "CEX2C count: %d\n", zcrypt_count_type(ZCRYPT_CEX2C));
+	seq_printf(m, "CEX2A count: %d\n", zcrypt_count_type(ZCRYPT_CEX2A));
+	seq_printf(m, "CEX3C count: %d\n", zcrypt_count_type(ZCRYPT_CEX3C));
+	seq_printf(m, "CEX3A count: %d\n", zcrypt_count_type(ZCRYPT_CEX3A));
+	seq_printf(m, "requestq count: %d\n", zcrypt_requestq_count());
+	seq_printf(m, "pendingq count: %d\n", zcrypt_pendingq_count());
+	seq_printf(m, "Total open handles: %d\n\n",
+		   atomic_read(&zcrypt_open_count));
+	zcrypt_status_mask(workarea);
+	sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
+		 "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
+		 m, workarea, AP_DEVICES);
+	zcrypt_qdepth_mask(workarea);
+	sprinthx("Waiting work element counts", m, workarea, AP_DEVICES);
+	zcrypt_perdev_reqcnt((int *) workarea);
+	sprinthx4("Per-device successfully completed request counts",
+		  m, (unsigned int *) workarea, AP_DEVICES);
+	return 0;
+}
+
+static int zcrypt_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, zcrypt_proc_show, NULL);
+}
+
+static void zcrypt_disable_card(int index)
+{
+	struct zcrypt_device *zdev;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list)
+		if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
+			zdev->online = 0;
+			ap_flush_queue(zdev->ap_dev);
+			break;
+		}
+	spin_unlock_bh(&zcrypt_device_lock);
+}
+
+static void zcrypt_enable_card(int index)
+{
+	struct zcrypt_device *zdev;
+
+	spin_lock_bh(&zcrypt_device_lock);
+	list_for_each_entry(zdev, &zcrypt_device_list, list)
+		if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
+			zdev->online = 1;
+			break;
+		}
+	spin_unlock_bh(&zcrypt_device_lock);
+}
+
+static ssize_t zcrypt_proc_write(struct file *file, const char __user *buffer,
+				 size_t count, loff_t *pos)
+{
+	unsigned char *lbuf, *ptr;
+	size_t local_count;
+	int j;
+
+	if (count <= 0)
+		return 0;
+
+#define LBUFSIZE 1200UL
+	lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
+	if (!lbuf)
+		return 0;
+
+	local_count = min(LBUFSIZE - 1, count);
+	if (copy_from_user(lbuf, buffer, local_count) != 0) {
+		kfree(lbuf);
+		return -EFAULT;
+	}
+	lbuf[local_count] = '\0';
+
+	ptr = strstr(lbuf, "Online devices");
+	if (!ptr)
+		goto out;
+	ptr = strstr(ptr, "\n");
+	if (!ptr)
+		goto out;
+	ptr++;
+
+	if (strstr(ptr, "Waiting work element counts") == NULL)
+		goto out;
+
+	for (j = 0; j < 64 && *ptr; ptr++) {
+		/*
+		 * '0' for no device, '1' for PCICA, '2' for PCICC,
+		 * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
+		 * '5' for CEX2C and '6' for CEX2A'
+		 * '7' for CEX3C and '8' for CEX3A
+		 */
+		if (*ptr >= '0' && *ptr <= '8')
+			j++;
+		else if (*ptr == 'd' || *ptr == 'D')
+			zcrypt_disable_card(j++);
+		else if (*ptr == 'e' || *ptr == 'E')
+			zcrypt_enable_card(j++);
+		else if (*ptr != ' ' && *ptr != '\t')
+			break;
+	}
+out:
+	kfree(lbuf);
+	return count;
+}
+
+static const struct file_operations zcrypt_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= zcrypt_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+	.write		= zcrypt_proc_write,
+};
+
+static int zcrypt_rng_device_count;
+static u32 *zcrypt_rng_buffer;
+static int zcrypt_rng_buffer_index;
+static DEFINE_MUTEX(zcrypt_rng_mutex);
+
+static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	int rc;
+
+	/*
+	 * We don't need locking here because the RNG API guarantees serialized
+	 * read method calls.
+	 */
+	if (zcrypt_rng_buffer_index == 0) {
+		rc = zcrypt_rng((char *) zcrypt_rng_buffer);
+		/* on failure: retry once again after a requested rescan */
+		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
+			rc = zcrypt_rng((char *) zcrypt_rng_buffer);
+		if (rc < 0)
+			return -EIO;
+		zcrypt_rng_buffer_index = rc / sizeof *data;
+	}
+	*data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
+	return sizeof *data;
+}
+
+static struct hwrng zcrypt_rng_dev = {
+	.name		= "zcrypt",
+	.data_read	= zcrypt_rng_data_read,
+};
+
+static int zcrypt_rng_device_add(void)
+{
+	int rc = 0;
+
+	mutex_lock(&zcrypt_rng_mutex);
+	if (zcrypt_rng_device_count == 0) {
+		zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
+		if (!zcrypt_rng_buffer) {
+			rc = -ENOMEM;
+			goto out;
+		}
+		zcrypt_rng_buffer_index = 0;
+		rc = hwrng_register(&zcrypt_rng_dev);
+		if (rc)
+			goto out_free;
+		zcrypt_rng_device_count = 1;
+	} else
+		zcrypt_rng_device_count++;
+	mutex_unlock(&zcrypt_rng_mutex);
+	return 0;
+
+out_free:
+	free_page((unsigned long) zcrypt_rng_buffer);
+out:
+	mutex_unlock(&zcrypt_rng_mutex);
+	return rc;
+}
+
+static void zcrypt_rng_device_remove(void)
+{
+	mutex_lock(&zcrypt_rng_mutex);
+	zcrypt_rng_device_count--;
+	if (zcrypt_rng_device_count == 0) {
+		hwrng_unregister(&zcrypt_rng_dev);
+		free_page((unsigned long) zcrypt_rng_buffer);
+	}
+	mutex_unlock(&zcrypt_rng_mutex);
+}
+
+int __init zcrypt_debug_init(void)
+{
+	debugfs_root = debugfs_create_dir("zcrypt", NULL);
+
+	zcrypt_dbf_common = debug_register("zcrypt_common", 1, 1, 16);
+	debug_register_view(zcrypt_dbf_common, &debug_hex_ascii_view);
+	debug_set_level(zcrypt_dbf_common, DBF_ERR);
+
+	zcrypt_dbf_devices = debug_register("zcrypt_devices", 1, 1, 16);
+	debug_register_view(zcrypt_dbf_devices, &debug_hex_ascii_view);
+	debug_set_level(zcrypt_dbf_devices, DBF_ERR);
+
+	return 0;
+}
+
+void zcrypt_debug_exit(void)
+{
+	debugfs_remove(debugfs_root);
+	if (zcrypt_dbf_common)
+		debug_unregister(zcrypt_dbf_common);
+	if (zcrypt_dbf_devices)
+		debug_unregister(zcrypt_dbf_devices);
+}
+
+/**
+ * zcrypt_api_init(): Module initialization.
+ *
+ * The module initialization code.
+ */
+int __init zcrypt_api_init(void)
+{
+	int rc;
+
+	rc = zcrypt_debug_init();
+	if (rc)
+		goto out;
+
+	atomic_set(&zcrypt_rescan_req, 0);
+
+	/* Register the request sprayer. */
+	rc = misc_register(&zcrypt_misc_device);
+	if (rc < 0)
+		goto out;
+
+	/* Set up the proc file system */
+	zcrypt_entry = proc_create("driver/z90crypt", 0644, NULL, &zcrypt_proc_fops);
+	if (!zcrypt_entry) {
+		rc = -ENOMEM;
+		goto out_misc;
+	}
+
+	return 0;
+
+out_misc:
+	misc_deregister(&zcrypt_misc_device);
+out:
+	return rc;
+}
+
+/**
+ * zcrypt_api_exit(): Module termination.
+ *
+ * The module termination code.
+ */
+void zcrypt_api_exit(void)
+{
+	remove_proc_entry("driver/z90crypt", NULL);
+	misc_deregister(&zcrypt_misc_device);
+	zcrypt_debug_exit();
+}
+
+module_init(zcrypt_api_init);
+module_exit(zcrypt_api_exit);