tty: move hvc drivers to drivers/tty/hvc/

As requested by Arnd Bergmann, the hvc drivers are now
moved to the drivers/tty/hvc/ directory.  The virtio_console.c driver
was also moved, as it required the hvc_console.h file to be able to be
built, and it really is a hvc driver.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 1337 deletions

diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c
deleted file mode 100644
index c3425bb3a1f..00000000000
--- a/drivers/char/hvc_iucv.c
+++ /dev/null
@@ -1,1337 +0,0 @@
-/*
- * hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver
- *
- * This HVC device driver provides terminal access using
- * z/VM IUCV communication paths.
- *
- * Copyright IBM Corp. 2008, 2009
- *
- * Author(s):	Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
- */
-#define KMSG_COMPONENT		"hvc_iucv"
-#define pr_fmt(fmt)		KMSG_COMPONENT ": " fmt
-
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <asm/ebcdic.h>
-#include <linux/ctype.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/mempool.h>
-#include <linux/moduleparam.h>
-#include <linux/tty.h>
-#include <linux/wait.h>
-#include <net/iucv/iucv.h>
-
-#include "hvc_console.h"
-
-
-/* General device driver settings */
-#define HVC_IUCV_MAGIC		0xc9e4c3e5
-#define MAX_HVC_IUCV_LINES	HVC_ALLOC_TTY_ADAPTERS
-#define MEMPOOL_MIN_NR		(PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4)
-
-/* IUCV TTY message  */
-#define MSG_VERSION		0x02	/* Message version */
-#define MSG_TYPE_ERROR		0x01	/* Error message */
-#define MSG_TYPE_TERMENV	0x02	/* Terminal environment variable */
-#define MSG_TYPE_TERMIOS	0x04	/* Terminal IO struct update */
-#define MSG_TYPE_WINSIZE	0x08	/* Terminal window size update */
-#define MSG_TYPE_DATA		0x10	/* Terminal data */
-
-struct iucv_tty_msg {
-	u8	version;		/* Message version */
-	u8	type;			/* Message type */
-#define MSG_MAX_DATALEN		((u16)(~0))
-	u16	datalen;		/* Payload length */
-	u8	data[];			/* Payload buffer */
-} __attribute__((packed));
-#define MSG_SIZE(s)		((s) + offsetof(struct iucv_tty_msg, data))
-
-enum iucv_state_t {
-	IUCV_DISCONN	= 0,
-	IUCV_CONNECTED	= 1,
-	IUCV_SEVERED	= 2,
-};
-
-enum tty_state_t {
-	TTY_CLOSED	= 0,
-	TTY_OPENED	= 1,
-};
-
-struct hvc_iucv_private {
-	struct hvc_struct	*hvc;		/* HVC struct reference */
-	u8			srv_name[8];	/* IUCV service name (ebcdic) */
-	unsigned char		is_console;	/* Linux console usage flag */
-	enum iucv_state_t	iucv_state;	/* IUCV connection status */
-	enum tty_state_t	tty_state;	/* TTY status */
-	struct iucv_path	*path;		/* IUCV path pointer */
-	spinlock_t		lock;		/* hvc_iucv_private lock */
-#define SNDBUF_SIZE		(PAGE_SIZE)	/* must be < MSG_MAX_DATALEN */
-	void			*sndbuf;	/* send buffer		  */
-	size_t			sndbuf_len;	/* length of send buffer  */
-#define QUEUE_SNDBUF_DELAY	(HZ / 25)
-	struct delayed_work	sndbuf_work;	/* work: send iucv msg(s) */
-	wait_queue_head_t	sndbuf_waitq;	/* wait for send completion */
-	struct list_head	tty_outqueue;	/* outgoing IUCV messages */
-	struct list_head	tty_inqueue;	/* incoming IUCV messages */
-	struct device		*dev;		/* device structure */
-};
-
-struct iucv_tty_buffer {
-	struct list_head	list;	/* list pointer */
-	struct iucv_message	msg;	/* store an IUCV message */
-	size_t			offset;	/* data buffer offset */
-	struct iucv_tty_msg	*mbuf;	/* buffer to store input/output data */
-};
-
-/* IUCV callback handler */
-static	int hvc_iucv_path_pending(struct iucv_path *, u8[8], u8[16]);
-static void hvc_iucv_path_severed(struct iucv_path *, u8[16]);
-static void hvc_iucv_msg_pending(struct iucv_path *, struct iucv_message *);
-static void hvc_iucv_msg_complete(struct iucv_path *, struct iucv_message *);
-
-
-/* Kernel module parameter: use one terminal device as default */
-static unsigned long hvc_iucv_devices = 1;
-
-/* Array of allocated hvc iucv tty lines... */
-static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];
-#define IUCV_HVC_CON_IDX	(0)
-/* List of z/VM user ID filter entries (struct iucv_vmid_filter) */
-#define MAX_VMID_FILTER		(500)
-static size_t hvc_iucv_filter_size;
-static void *hvc_iucv_filter;
-static const char *hvc_iucv_filter_string;
-static DEFINE_RWLOCK(hvc_iucv_filter_lock);
-
-/* Kmem cache and mempool for iucv_tty_buffer elements */
-static struct kmem_cache *hvc_iucv_buffer_cache;
-static mempool_t *hvc_iucv_mempool;
-
-/* IUCV handler callback functions */
-static struct iucv_handler hvc_iucv_handler = {
-	.path_pending  = hvc_iucv_path_pending,
-	.path_severed  = hvc_iucv_path_severed,
-	.message_complete = hvc_iucv_msg_complete,
-	.message_pending  = hvc_iucv_msg_pending,
-};
-
-
-/**
- * hvc_iucv_get_private() - Return a struct hvc_iucv_private instance.
- * @num:	The HVC virtual terminal number (vtermno)
- *
- * This function returns the struct hvc_iucv_private instance that corresponds
- * to the HVC virtual terminal number specified as parameter @num.
- */
-struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
-{
-	if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices))
-		return NULL;
-	return hvc_iucv_table[num - HVC_IUCV_MAGIC];
-}
-
-/**
- * alloc_tty_buffer() - Return a new struct iucv_tty_buffer element.
- * @size:	Size of the internal buffer used to store data.
- * @flags:	Memory allocation flags passed to mempool.
- *
- * This function allocates a new struct iucv_tty_buffer element and, optionally,
- * allocates an internal data buffer with the specified size @size.
- * The internal data buffer is always allocated with GFP_DMA which is
- * required for receiving and sending data with IUCV.
- * Note: The total message size arises from the internal buffer size and the
- *	 members of the iucv_tty_msg structure.
- * The function returns NULL if memory allocation has failed.
- */
-static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
-{
-	struct iucv_tty_buffer *bufp;
-
-	bufp = mempool_alloc(hvc_iucv_mempool, flags);
-	if (!bufp)
-		return NULL;
-	memset(bufp, 0, sizeof(*bufp));
-
-	if (size > 0) {
-		bufp->msg.length = MSG_SIZE(size);
-		bufp->mbuf = kmalloc(bufp->msg.length, flags | GFP_DMA);
-		if (!bufp->mbuf) {
-			mempool_free(bufp, hvc_iucv_mempool);
-			return NULL;
-		}
-		bufp->mbuf->version = MSG_VERSION;
-		bufp->mbuf->type    = MSG_TYPE_DATA;
-		bufp->mbuf->datalen = (u16) size;
-	}
-	return bufp;
-}
-
-/**
- * destroy_tty_buffer() - destroy struct iucv_tty_buffer element.
- * @bufp:	Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL.
- */
-static void destroy_tty_buffer(struct iucv_tty_buffer *bufp)
-{
-	kfree(bufp->mbuf);
-	mempool_free(bufp, hvc_iucv_mempool);
-}
-
-/**
- * destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element.
- * @list:	List containing struct iucv_tty_buffer elements.
- */
-static void destroy_tty_buffer_list(struct list_head *list)
-{
-	struct iucv_tty_buffer *ent, *next;
-
-	list_for_each_entry_safe(ent, next, list, list) {
-		list_del(&ent->list);
-		destroy_tty_buffer(ent);
-	}
-}
-
-/**
- * hvc_iucv_write() - Receive IUCV message & write data to HVC buffer.
- * @priv:		Pointer to struct hvc_iucv_private
- * @buf:		HVC buffer for writing received terminal data.
- * @count:		HVC buffer size.
- * @has_more_data:	Pointer to an int variable.
- *
- * The function picks up pending messages from the input queue and receives
- * the message data that is then written to the specified buffer @buf.
- * If the buffer size @count is less than the data message size, the
- * message is kept on the input queue and @has_more_data is set to 1.
- * If all message data has been written, the message is removed from
- * the input queue.
- *
- * The function returns the number of bytes written to the terminal, zero if
- * there are no pending data messages available or if there is no established
- * IUCV path.
- * If the IUCV path has been severed, then -EPIPE is returned to cause a
- * hang up (that is issued by the HVC layer).
- */
-static int hvc_iucv_write(struct hvc_iucv_private *priv,
-			  char *buf, int count, int *has_more_data)
-{
-	struct iucv_tty_buffer *rb;
-	int written;
-	int rc;
-
-	/* immediately return if there is no IUCV connection */
-	if (priv->iucv_state == IUCV_DISCONN)
-		return 0;
-
-	/* if the IUCV path has been severed, return -EPIPE to inform the
-	 * HVC layer to hang up the tty device. */
-	if (priv->iucv_state == IUCV_SEVERED)
-		return -EPIPE;
-
-	/* check if there are pending messages */
-	if (list_empty(&priv->tty_inqueue))
-		return 0;
-
-	/* receive an iucv message and flip data to the tty (ldisc) */
-	rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list);
-
-	written = 0;
-	if (!rb->mbuf) { /* message not yet received ... */
-		/* allocate mem to store msg data; if no memory is available
-		 * then leave the buffer on the list and re-try later */
-		rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC | GFP_DMA);
-		if (!rb->mbuf)
-			return -ENOMEM;
-
-		rc = __iucv_message_receive(priv->path, &rb->msg, 0,
-					    rb->mbuf, rb->msg.length, NULL);
-		switch (rc) {
-		case 0: /* Successful	    */
-			break;
-		case 2:	/* No message found */
-		case 9: /* Message purged   */
-			break;
-		default:
-			written = -EIO;
-		}
-		/* remove buffer if an error has occured or received data
-		 * is not correct */
-		if (rc || (rb->mbuf->version != MSG_VERSION) ||
-			  (rb->msg.length    != MSG_SIZE(rb->mbuf->datalen)))
-			goto out_remove_buffer;
-	}
-
-	switch (rb->mbuf->type) {
-	case MSG_TYPE_DATA:
-		written = min_t(int, rb->mbuf->datalen - rb->offset, count);
-		memcpy(buf, rb->mbuf->data + rb->offset, written);
-		if (written < (rb->mbuf->datalen - rb->offset)) {
-			rb->offset += written;
-			*has_more_data = 1;
-			goto out_written;
-		}
-		break;
-
-	case MSG_TYPE_WINSIZE:
-		if (rb->mbuf->datalen != sizeof(struct winsize))
-			break;
-		/* The caller must ensure that the hvc is locked, which
-		 * is the case when called from hvc_iucv_get_chars() */
-		__hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));
-		break;
-
-	case MSG_TYPE_ERROR:	/* ignored ... */
-	case MSG_TYPE_TERMENV:	/* ignored ... */
-	case MSG_TYPE_TERMIOS:	/* ignored ... */
-		break;
-	}
-
-out_remove_buffer:
-	list_del(&rb->list);
-	destroy_tty_buffer(rb);
-	*has_more_data = !list_empty(&priv->tty_inqueue);
-
-out_written:
-	return written;
-}
-
-/**
- * hvc_iucv_get_chars() - HVC get_chars operation.
- * @vtermno:	HVC virtual terminal number.
- * @buf:	Pointer to a buffer to store data
- * @count:	Size of buffer available for writing
- *
- * The HVC thread calls this method to read characters from the back-end.
- * If an IUCV communication path has been established, pending IUCV messages
- * are received and data is copied into buffer @buf up to @count bytes.
- *
- * Locking:	The routine gets called under an irqsave() spinlock; and
- *		the routine locks the struct hvc_iucv_private->lock to call
- *		helper functions.
- */
-static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count)
-{
-	struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno);
-	int written;
-	int has_more_data;
-
-	if (count <= 0)
-		return 0;
-
-	if (!priv)
-		return -ENODEV;
-
-	spin_lock(&priv->lock);
-	has_more_data = 0;
-	written = hvc_iucv_write(priv, buf, count, &has_more_data);
-	spin_unlock(&priv->lock);
-
-	/* if there are still messages on the queue... schedule another run */
-	if (has_more_data)
-		hvc_kick();
-
-	return written;
-}
-
-/**
- * hvc_iucv_queue() - Buffer terminal data for sending.
- * @priv:	Pointer to struct hvc_iucv_private instance.
- * @buf:	Buffer containing data to send.
- * @count:	Size of buffer and amount of data to send.
- *
- * The function queues data for sending. To actually send the buffered data,
- * a work queue function is scheduled (with QUEUE_SNDBUF_DELAY).
- * The function returns the number of data bytes that has been buffered.
- *
- * If the device is not connected, data is ignored and the function returns
- * @count.
- * If the buffer is full, the function returns 0.
- * If an existing IUCV communicaton path has been severed, -EPIPE is returned
- * (that can be passed to HVC layer to cause a tty hangup).
- */
-static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf,
-			  int count)
-{
-	size_t len;
-
-	if (priv->iucv_state == IUCV_DISCONN)
-		return count;			/* ignore data */
-
-	if (priv->iucv_state == IUCV_SEVERED)
-		return -EPIPE;
-
-	len = min_t(size_t, count, SNDBUF_SIZE - priv->sndbuf_len);
-	if (!len)
-		return 0;
-
-	memcpy(priv->sndbuf + priv->sndbuf_len, buf, len);
-	priv->sndbuf_len += len;
-
-	if (priv->iucv_state == IUCV_CONNECTED)
-		schedule_delayed_work(&priv->sndbuf_work, QUEUE_SNDBUF_DELAY);
-
-	return len;
-}
-
-/**
- * hvc_iucv_send() - Send an IUCV message containing terminal data.
- * @priv:	Pointer to struct hvc_iucv_private instance.
- *
- * If an IUCV communication path has been established, the buffered output data
- * is sent via an IUCV message and the number of bytes sent is returned.
- * Returns 0 if there is no established IUCV communication path or
- * -EPIPE if an existing IUCV communicaton path has been severed.
- */
-static int hvc_iucv_send(struct hvc_iucv_private *priv)
-{
-	struct iucv_tty_buffer *sb;
-	int rc, len;
-
-	if (priv->iucv_state == IUCV_SEVERED)
-		return -EPIPE;
-
-	if (priv->iucv_state == IUCV_DISCONN)
-		return -EIO;
-
-	if (!priv->sndbuf_len)
-		return 0;
-
-	/* allocate internal buffer to store msg data and also compute total
-	 * message length */
-	sb = alloc_tty_buffer(priv->sndbuf_len, GFP_ATOMIC);
-	if (!sb)
-		return -ENOMEM;
-
-	memcpy(sb->mbuf->data, priv->sndbuf, priv->sndbuf_len);
-	sb->mbuf->datalen = (u16) priv->sndbuf_len;
-	sb->msg.length = MSG_SIZE(sb->mbuf->datalen);
-
-	list_add_tail(&sb->list, &priv->tty_outqueue);
-
-	rc = __iucv_message_send(priv->path, &sb->msg, 0, 0,
-				 (void *) sb->mbuf, sb->msg.length);
-	if (rc) {
-		/* drop the message here; however we might want to handle
-		 * 0x03 (msg limit reached) by trying again... */
-		list_del(&sb->list);
-		destroy_tty_buffer(sb);
-	}
-	len = priv->sndbuf_len;
-	priv->sndbuf_len = 0;
-
-	return len;
-}
-
-/**
- * hvc_iucv_sndbuf_work() - Send buffered data over IUCV
- * @work:	Work structure.
- *
- * This work queue function sends buffered output data over IUCV and,
- * if not all buffered data could be sent, reschedules itself.
- */
-static void hvc_iucv_sndbuf_work(struct work_struct *work)
-{
-	struct hvc_iucv_private *priv;
-
-	priv = container_of(work, struct hvc_iucv_private, sndbuf_work.work);
-	if (!priv)
-		return;
-
-	spin_lock_bh(&priv->lock);
-	hvc_iucv_send(priv);
-	spin_unlock_bh(&priv->lock);
-}
-
-/**
- * hvc_iucv_put_chars() - HVC put_chars operation.
- * @vtermno:	HVC virtual terminal number.
- * @buf:	Pointer to an buffer to read data from
- * @count:	Size of buffer available for reading
- *
- * The HVC thread calls this method to write characters to the back-end.
- * The function calls hvc_iucv_queue() to queue terminal data for sending.
- *
- * Locking:	The method gets called under an irqsave() spinlock; and
- *		locks struct hvc_iucv_private->lock.
- */
-static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count)
-{
-	struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno);
-	int queued;
-
-	if (count <= 0)
-		return 0;
-
-	if (!priv)
-		return -ENODEV;
-
-	spin_lock(&priv->lock);
-	queued = hvc_iucv_queue(priv, buf, count);
-	spin_unlock(&priv->lock);
-
-	return queued;
-}
-
-/**
- * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time.
- * @hp:	Pointer to the HVC device (struct hvc_struct)
- * @id:	Additional data (originally passed to hvc_alloc): the index of an struct
- *	hvc_iucv_private instance.
- *
- * The function sets the tty state to TTY_OPENED for the struct hvc_iucv_private
- * instance that is derived from @id. Always returns 0.
- *
- * Locking:	struct hvc_iucv_private->lock, spin_lock_bh
- */
-static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id)
-{
-	struct hvc_iucv_private *priv;
-
-	priv = hvc_iucv_get_private(id);
-	if (!priv)
-		return 0;
-
-	spin_lock_bh(&priv->lock);
-	priv->tty_state = TTY_OPENED;
-	spin_unlock_bh(&priv->lock);
-
-	return 0;
-}
-
-/**
- * hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
- * @priv:	Pointer to the struct hvc_iucv_private instance.
- */
-static void hvc_iucv_cleanup(struct hvc_iucv_private *priv)
-{
-	destroy_tty_buffer_list(&priv->tty_outqueue);
-	destroy_tty_buffer_list(&priv->tty_inqueue);
-
-	priv->tty_state = TTY_CLOSED;
-	priv->iucv_state = IUCV_DISCONN;
-
-	priv->sndbuf_len = 0;
-}
-
-/**
- * tty_outqueue_empty() - Test if the tty outq is empty
- * @priv:	Pointer to struct hvc_iucv_private instance.
- */
-static inline int tty_outqueue_empty(struct hvc_iucv_private *priv)
-{
-	int rc;
-
-	spin_lock_bh(&priv->lock);
-	rc = list_empty(&priv->tty_outqueue);
-	spin_unlock_bh(&priv->lock);
-
-	return rc;
-}
-
-/**
- * flush_sndbuf_sync() - Flush send buffer and wait for completion
- * @priv:	Pointer to struct hvc_iucv_private instance.
- *
- * The routine cancels a pending sndbuf work, calls hvc_iucv_send()
- * to flush any buffered terminal output data and waits for completion.
- */
-static void flush_sndbuf_sync(struct hvc_iucv_private *priv)
-{
-	int sync_wait;
-
-	cancel_delayed_work_sync(&priv->sndbuf_work);
-
-	spin_lock_bh(&priv->lock);
-	hvc_iucv_send(priv);		/* force sending buffered data */
-	sync_wait = !list_empty(&priv->tty_outqueue); /* anything queued ? */
-	spin_unlock_bh(&priv->lock);
-
-	if (sync_wait)
-		wait_event_timeout(priv->sndbuf_waitq,
-				   tty_outqueue_empty(priv), HZ/10);
-}
-
-/**
- * hvc_iucv_hangup() - Sever IUCV path and schedule hvc tty hang up
- * @priv:	Pointer to hvc_iucv_private structure
- *
- * This routine severs an existing IUCV communication path and hangs
- * up the underlying HVC terminal device.
- * The hang-up occurs only if an IUCV communication path is established;
- * otherwise there is no need to hang up the terminal device.
- *
- * The IUCV HVC hang-up is separated into two steps:
- * 1. After the IUCV path has been severed, the iucv_state is set to
- *    IUCV_SEVERED.
- * 2. Later, when the HVC thread calls hvc_iucv_get_chars(), the
- *    IUCV_SEVERED state causes the tty hang-up in the HVC layer.
- *
- * If the tty has not yet been opened, clean up the hvc_iucv_private
- * structure to allow re-connects.
- * If the tty has been opened, let get_chars() return -EPIPE to signal
- * the HVC layer to hang up the tty and, if so, wake up the HVC thread
- * to call get_chars()...
- *
- * Special notes on hanging up a HVC terminal instantiated as console:
- * Hang-up:	1. do_tty_hangup() replaces file ops (= hung_up_tty_fops)
- *		2. do_tty_hangup() calls tty->ops->close() for console_filp
- *			=> no hangup notifier is called by HVC (default)
- *		2. hvc_close() returns because of tty_hung_up_p(filp)
- *			=> no delete notifier is called!
- * Finally, the back-end is not being notified, thus, the tty session is
- * kept active (TTY_OPEN) to be ready for re-connects.
- *
- * Locking:	spin_lock(&priv->lock) w/o disabling bh
- */
-static void hvc_iucv_hangup(struct hvc_iucv_private *priv)
-{
-	struct iucv_path *path;
-
-	path = NULL;
-	spin_lock(&priv->lock);
-	if (priv->iucv_state == IUCV_CONNECTED) {
-		path = priv->path;
-		priv->path = NULL;
-		priv->iucv_state = IUCV_SEVERED;
-		if (priv->tty_state == TTY_CLOSED)
-			hvc_iucv_cleanup(priv);
-		else
-			/* console is special (see above) */
-			if (priv->is_console) {
-				hvc_iucv_cleanup(priv);
-				priv->tty_state = TTY_OPENED;
-			} else
-				hvc_kick();
-	}
-	spin_unlock(&priv->lock);
-
-	/* finally sever path (outside of priv->lock due to lock ordering) */
-	if (path) {
-		iucv_path_sever(path, NULL);
-		iucv_path_free(path);
-	}
-}
-
-/**
- * hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups.
- * @hp:		Pointer to the HVC device (struct hvc_struct)
- * @id:		Additional data (originally passed to hvc_alloc):
- *		the index of an struct hvc_iucv_private instance.
- *
- * This routine notifies the HVC back-end that a tty hangup (carrier loss,
- * virtual or otherwise) has occured.
- * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
- * to keep an existing IUCV communication path established.
- * (Background: vhangup() is called from user space (by getty or login) to
- *		disable writing to the tty by other applications).
- * If the tty has been opened and an established IUCV path has been severed
- * (we caused the tty hangup), the function calls hvc_iucv_cleanup().
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
-{
-	struct hvc_iucv_private *priv;
-
-	priv = hvc_iucv_get_private(id);
-	if (!priv)
-		return;
-
-	flush_sndbuf_sync(priv);
-
-	spin_lock_bh(&priv->lock);
-	/* NOTE: If the hangup was scheduled by ourself (from the iucv
-	 *	 path_servered callback [IUCV_SEVERED]), we have to clean up
-	 *	 our structure and to set state to TTY_CLOSED.
-	 *	 If the tty was hung up otherwise (e.g. vhangup()), then we
-	 *	 ignore this hangup and keep an established IUCV path open...
-	 *	 (...the reason is that we are not able to connect back to the
-	 *	 client if we disconnect on hang up) */
-	priv->tty_state = TTY_CLOSED;
-
-	if (priv->iucv_state == IUCV_SEVERED)
-		hvc_iucv_cleanup(priv);
-	spin_unlock_bh(&priv->lock);
-}
-
-/**
- * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time.
- * @hp:		Pointer to the HVC device (struct hvc_struct)
- * @id:		Additional data (originally passed to hvc_alloc):
- *		the index of an struct hvc_iucv_private instance.
- *
- * This routine notifies the HVC back-end that the last tty device fd has been
- * closed.  The function calls hvc_iucv_cleanup() to clean up the struct
- * hvc_iucv_private instance.
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
-{
-	struct hvc_iucv_private *priv;
-	struct iucv_path	*path;
-
-	priv = hvc_iucv_get_private(id);
-	if (!priv)
-		return;
-
-	flush_sndbuf_sync(priv);
-
-	spin_lock_bh(&priv->lock);
-	path = priv->path;		/* save reference to IUCV path */
-	priv->path = NULL;
-	hvc_iucv_cleanup(priv);
-	spin_unlock_bh(&priv->lock);
-
-	/* sever IUCV path outside of priv->lock due to lock ordering of:
-	 * priv->lock <--> iucv_table_lock */
-	if (path) {
-		iucv_path_sever(path, NULL);
-		iucv_path_free(path);
-	}
-}
-
-/**
- * hvc_iucv_filter_connreq() - Filter connection request based on z/VM user ID
- * @ipvmid:	Originating z/VM user ID (right padded with blanks)
- *
- * Returns 0 if the z/VM user ID @ipvmid is allowed to connection, otherwise
- * non-zero.
- */
-static int hvc_iucv_filter_connreq(u8 ipvmid[8])
-{
-	size_t i;
-
-	/* Note: default policy is ACCEPT if no filter is set */
-	if (!hvc_iucv_filter_size)
-		return 0;
-
-	for (i = 0; i < hvc_iucv_filter_size; i++)
-		if (0 == memcmp(ipvmid, hvc_iucv_filter + (8 * i), 8))
-			return 0;
-	return 1;
-}
-
-/**
- * hvc_iucv_path_pending() - IUCV handler to process a connection request.
- * @path:	Pending path (struct iucv_path)
- * @ipvmid:	z/VM system identifier of originator
- * @ipuser:	User specified data for this path
- *		(AF_IUCV: port/service name and originator port)
- *
- * The function uses the @ipuser data to determine if the pending path belongs
- * to a terminal managed by this device driver.
- * If the path belongs to this driver, ensure that the terminal is not accessed
- * multiple times (only one connection to a terminal is allowed).
- * If the terminal is not yet connected, the pending path is accepted and is
- * associated to the appropriate struct hvc_iucv_private instance.
- *
- * Returns 0 if @path belongs to a terminal managed by the this device driver;
- * otherwise returns -ENODEV in order to dispatch this path to other handlers.
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static	int hvc_iucv_path_pending(struct iucv_path *path,
-				  u8 ipvmid[8], u8 ipuser[16])
-{
-	struct hvc_iucv_private *priv;
-	u8 nuser_data[16];
-	u8 vm_user_id[9];
-	int i, rc;
-
-	priv = NULL;
-	for (i = 0; i < hvc_iucv_devices; i++)
-		if (hvc_iucv_table[i] &&
-		    (0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) {
-			priv = hvc_iucv_table[i];
-			break;
-		}
-	if (!priv)
-		return -ENODEV;
-
-	/* Enforce that ipvmid is allowed to connect to us */
-	read_lock(&hvc_iucv_filter_lock);
-	rc = hvc_iucv_filter_connreq(ipvmid);
-	read_unlock(&hvc_iucv_filter_lock);
-	if (rc) {
-		iucv_path_sever(path, ipuser);
-		iucv_path_free(path);
-		memcpy(vm_user_id, ipvmid, 8);
-		vm_user_id[8] = 0;
-		pr_info("A connection request from z/VM user ID %s "
-			"was refused\n", vm_user_id);
-		return 0;
-	}
-
-	spin_lock(&priv->lock);
-
-	/* If the terminal is already connected or being severed, then sever
-	 * this path to enforce that there is only ONE established communication
-	 * path per terminal. */
-	if (priv->iucv_state != IUCV_DISCONN) {
-		iucv_path_sever(path, ipuser);
-		iucv_path_free(path);
-		goto out_path_handled;
-	}
-
-	/* accept path */
-	memcpy(nuser_data, ipuser + 8, 8);  /* remote service (for af_iucv) */
-	memcpy(nuser_data + 8, ipuser, 8);  /* local service  (for af_iucv) */
-	path->msglim = 0xffff;		    /* IUCV MSGLIMIT */
-	path->flags &= ~IUCV_IPRMDATA;	    /* TODO: use IUCV_IPRMDATA */
-	rc = iucv_path_accept(path, &hvc_iucv_handler, nuser_data, priv);
-	if (rc) {
-		iucv_path_sever(path, ipuser);
-		iucv_path_free(path);
-		goto out_path_handled;
-	}
-	priv->path = path;
-	priv->iucv_state = IUCV_CONNECTED;
-
-	/* flush buffered output data... */
-	schedule_delayed_work(&priv->sndbuf_work, 5);
-
-out_path_handled:
-	spin_unlock(&priv->lock);
-	return 0;
-}
-
-/**
- * hvc_iucv_path_severed() - IUCV handler to process a path sever.
- * @path:	Pending path (struct iucv_path)
- * @ipuser:	User specified data for this path
- *		(AF_IUCV: port/service name and originator port)
- *
- * This function calls the hvc_iucv_hangup() function for the
- * respective IUCV HVC terminal.
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
-{
-	struct hvc_iucv_private *priv = path->private;
-
-	hvc_iucv_hangup(priv);
-}
-
-/**
- * hvc_iucv_msg_pending() - IUCV handler to process an incoming IUCV message.
- * @path:	Pending path (struct iucv_path)
- * @msg:	Pointer to the IUCV message
- *
- * The function puts an incoming message on the input queue for later
- * processing (by hvc_iucv_get_chars() / hvc_iucv_write()).
- * If the tty has not yet been opened, the message is rejected.
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static void hvc_iucv_msg_pending(struct iucv_path *path,
-				 struct iucv_message *msg)
-{
-	struct hvc_iucv_private *priv = path->private;
-	struct iucv_tty_buffer *rb;
-
-	/* reject messages that exceed max size of iucv_tty_msg->datalen */
-	if (msg->length > MSG_SIZE(MSG_MAX_DATALEN)) {
-		iucv_message_reject(path, msg);
-		return;
-	}
-
-	spin_lock(&priv->lock);
-
-	/* reject messages if tty has not yet been opened */
-	if (priv->tty_state == TTY_CLOSED) {
-		iucv_message_reject(path, msg);
-		goto unlock_return;
-	}
-
-	/* allocate tty buffer to save iucv msg only */
-	rb = alloc_tty_buffer(0, GFP_ATOMIC);
-	if (!rb) {
-		iucv_message_reject(path, msg);
-		goto unlock_return;	/* -ENOMEM */
-	}
-	rb->msg = *msg;
-
-	list_add_tail(&rb->list, &priv->tty_inqueue);
-
-	hvc_kick();	/* wake up hvc thread */
-
-unlock_return:
-	spin_unlock(&priv->lock);
-}
-
-/**
- * hvc_iucv_msg_complete() - IUCV handler to process message completion
- * @path:	Pending path (struct iucv_path)
- * @msg:	Pointer to the IUCV message
- *
- * The function is called upon completion of message delivery to remove the
- * message from the outqueue. Additional delivery information can be found
- * msg->audit: rejected messages (0x040000 (IPADRJCT)), and
- *	       purged messages	 (0x010000 (IPADPGNR)).
- *
- * Locking:	struct hvc_iucv_private->lock
- */
-static void hvc_iucv_msg_complete(struct iucv_path *path,
-				  struct iucv_message *msg)
-{
-	struct hvc_iucv_private *priv = path->private;
-	struct iucv_tty_buffer	*ent, *next;
-	LIST_HEAD(list_remove);
-
-	spin_lock(&priv->lock);
-	list_for_each_entry_safe(ent, next, &priv->tty_outqueue, list)
-		if (ent->msg.id == msg->id) {
-			list_move(&ent->list, &list_remove);
-			break;
-		}
-	wake_up(&priv->sndbuf_waitq);
-	spin_unlock(&priv->lock);
-	destroy_tty_buffer_list(&list_remove);
-}
-
-/**
- * hvc_iucv_pm_freeze() - Freeze PM callback
- * @dev:	IUVC HVC terminal device
- *
- * Sever an established IUCV communication path and
- * trigger a hang-up of the underlying HVC terminal.
- */
-static int hvc_iucv_pm_freeze(struct device *dev)
-{
-	struct hvc_iucv_private *priv = dev_get_drvdata(dev);
-
-	local_bh_disable();
-	hvc_iucv_hangup(priv);
-	local_bh_enable();
-
-	return 0;
-}
-
-/**
- * hvc_iucv_pm_restore_thaw() - Thaw and restore PM callback
- * @dev:	IUVC HVC terminal device
- *
- * Wake up the HVC thread to trigger hang-up and respective
- * HVC back-end notifier invocations.
- */
-static int hvc_iucv_pm_restore_thaw(struct device *dev)
-{
-	hvc_kick();
-	return 0;
-}
-
-
-/* HVC operations */
-static const struct hv_ops hvc_iucv_ops = {
-	.get_chars = hvc_iucv_get_chars,
-	.put_chars = hvc_iucv_put_chars,
-	.notifier_add = hvc_iucv_notifier_add,
-	.notifier_del = hvc_iucv_notifier_del,
-	.notifier_hangup = hvc_iucv_notifier_hangup,
-};
-
-/* Suspend / resume device operations */
-static const struct dev_pm_ops hvc_iucv_pm_ops = {
-	.freeze	  = hvc_iucv_pm_freeze,
-	.thaw	  = hvc_iucv_pm_restore_thaw,
-	.restore  = hvc_iucv_pm_restore_thaw,
-};
-
-/* IUCV HVC device driver */
-static struct device_driver hvc_iucv_driver = {
-	.name = KMSG_COMPONENT,
-	.bus  = &iucv_bus,
-	.pm   = &hvc_iucv_pm_ops,
-};
-
-/**
- * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
- * @id:			hvc_iucv_table index
- * @is_console:		Flag if the instance is used as Linux console
- *
- * This function allocates a new hvc_iucv_private structure and stores
- * the instance in hvc_iucv_table at index @id.
- * Returns 0 on success; otherwise non-zero.
- */
-static int __init hvc_iucv_alloc(int id, unsigned int is_console)
-{
-	struct hvc_iucv_private *priv;
-	char name[9];
-	int rc;
-
-	priv = kzalloc(sizeof(struct hvc_iucv_private), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	spin_lock_init(&priv->lock);
-	INIT_LIST_HEAD(&priv->tty_outqueue);
-	INIT_LIST_HEAD(&priv->tty_inqueue);
-	INIT_DELAYED_WORK(&priv->sndbuf_work, hvc_iucv_sndbuf_work);
-	init_waitqueue_head(&priv->sndbuf_waitq);
-
-	priv->sndbuf = (void *) get_zeroed_page(GFP_KERNEL);
-	if (!priv->sndbuf) {
-		kfree(priv);
-		return -ENOMEM;
-	}
-
-	/* set console flag */
-	priv->is_console = is_console;
-
-	/* allocate hvc device */
-	priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /*		  PAGE_SIZE */
-			      HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256);
-	if (IS_ERR(priv->hvc)) {
-		rc = PTR_ERR(priv->hvc);
-		goto out_error_hvc;
-	}
-
-	/* notify HVC thread instead of using polling */
-	priv->hvc->irq_requested = 1;
-
-	/* setup iucv related information */
-	snprintf(name, 9, "lnxhvc%-2d", id);
-	memcpy(priv->srv_name, name, 8);
-	ASCEBC(priv->srv_name, 8);
-
-	/* create and setup device */
-	priv->dev = kzalloc(sizeof(*priv->dev), GFP_KERNEL);
-	if (!priv->dev) {
-		rc = -ENOMEM;
-		goto out_error_dev;
-	}
-	dev_set_name(priv->dev, "hvc_iucv%d", id);
-	dev_set_drvdata(priv->dev, priv);
-	priv->dev->bus = &iucv_bus;
-	priv->dev->parent = iucv_root;
-	priv->dev->driver = &hvc_iucv_driver;
-	priv->dev->release = (void (*)(struct device *)) kfree;
-	rc = device_register(priv->dev);
-	if (rc) {
-		put_device(priv->dev);
-		goto out_error_dev;
-	}
-
-	hvc_iucv_table[id] = priv;
-	return 0;
-
-out_error_dev:
-	hvc_remove(priv->hvc);
-out_error_hvc:
-	free_page((unsigned long) priv->sndbuf);
-	kfree(priv);
-
-	return rc;
-}
-
-/**
- * hvc_iucv_destroy() - Destroy and free hvc_iucv_private instances
- */
-static void __init hvc_iucv_destroy(struct hvc_iucv_private *priv)
-{
-	hvc_remove(priv->hvc);
-	device_unregister(priv->dev);
-	free_page((unsigned long) priv->sndbuf);
-	kfree(priv);
-}
-
-/**
- * hvc_iucv_parse_filter() - Parse filter for a single z/VM user ID
- * @filter:	String containing a comma-separated list of z/VM user IDs
- */
-static const char *hvc_iucv_parse_filter(const char *filter, char *dest)
-{
-	const char *nextdelim, *residual;
-	size_t len;
-
-	nextdelim = strchr(filter, ',');
-	if (nextdelim) {
-		len = nextdelim - filter;
-		residual = nextdelim + 1;
-	} else {
-		len = strlen(filter);
-		residual = filter + len;
-	}
-
-	if (len == 0)
-		return ERR_PTR(-EINVAL);
-
-	/* check for '\n' (if called from sysfs) */
-	if (filter[len - 1] == '\n')
-		len--;
-
-	if (len > 8)
-		return ERR_PTR(-EINVAL);
-
-	/* pad with blanks and save upper case version of user ID */
-	memset(dest, ' ', 8);
-	while (len--)
-		dest[len] = toupper(filter[len]);
-	return residual;
-}
-
-/**
- * hvc_iucv_setup_filter() - Set up z/VM user ID filter
- * @filter:	String consisting of a comma-separated list of z/VM user IDs
- *
- * The function parses the @filter string and creates an array containing
- * the list of z/VM user ID filter entries.
- * Return code 0 means success, -EINVAL if the filter is syntactically
- * incorrect, -ENOMEM if there was not enough memory to allocate the
- * filter list array, or -ENOSPC if too many z/VM user IDs have been specified.
- */
-static int hvc_iucv_setup_filter(const char *val)
-{
-	const char *residual;
-	int err;
-	size_t size, count;
-	void *array, *old_filter;
-
-	count = strlen(val);
-	if (count == 0 || (count == 1 && val[0] == '\n')) {
-		size  = 0;
-		array = NULL;
-		goto out_replace_filter;	/* clear filter */
-	}
-
-	/* count user IDs in order to allocate sufficient memory */
-	size = 1;
-	residual = val;
-	while ((residual = strchr(residual, ',')) != NULL) {
-		residual++;
-		size++;
-	}
-
-	/* check if the specified list exceeds the filter limit */
-	if (size > MAX_VMID_FILTER)
-		return -ENOSPC;
-
-	array = kzalloc(size * 8, GFP_KERNEL);
-	if (!array)
-		return -ENOMEM;
-
-	count = size;
-	residual = val;
-	while (*residual && count) {
-		residual = hvc_iucv_parse_filter(residual,
-						 array + ((size - count) * 8));
-		if (IS_ERR(residual)) {
-			err = PTR_ERR(residual);
-			kfree(array);
-			goto out_err;
-		}
-		count--;
-	}
-
-out_replace_filter:
-	write_lock_bh(&hvc_iucv_filter_lock);
-	old_filter = hvc_iucv_filter;
-	hvc_iucv_filter_size = size;
-	hvc_iucv_filter = array;
-	write_unlock_bh(&hvc_iucv_filter_lock);
-	kfree(old_filter);
-
-	err = 0;
-out_err:
-	return err;
-}
-
-/**
- * param_set_vmidfilter() - Set z/VM user ID filter parameter
- * @val:	String consisting of a comma-separated list of z/VM user IDs
- * @kp:		Kernel parameter pointing to hvc_iucv_filter array
- *
- * The function sets up the z/VM user ID filter specified as comma-separated
- * list of user IDs in @val.
- * Note: If it is called early in the boot process, @val is stored and
- *	 parsed later in hvc_iucv_init().
- */
-static int param_set_vmidfilter(const char *val, const struct kernel_param *kp)
-{
-	int rc;
-
-	if (!MACHINE_IS_VM || !hvc_iucv_devices)
-		return -ENODEV;
-
-	if (!val)
-		return -EINVAL;
-
-	rc = 0;
-	if (slab_is_available())
-		rc = hvc_iucv_setup_filter(val);
-	else
-		hvc_iucv_filter_string = val;	/* defer... */
-	return rc;
-}
-
-/**
- * param_get_vmidfilter() - Get z/VM user ID filter
- * @buffer:	Buffer to store z/VM user ID filter,
- *		(buffer size assumption PAGE_SIZE)
- * @kp:		Kernel parameter pointing to the hvc_iucv_filter array
- *
- * The function stores the filter as a comma-separated list of z/VM user IDs
- * in @buffer. Typically, sysfs routines call this function for attr show.
- */
-static int param_get_vmidfilter(char *buffer, const struct kernel_param *kp)
-{
-	int rc;
-	size_t index, len;
-	void *start, *end;
-
-	if (!MACHINE_IS_VM || !hvc_iucv_devices)
-		return -ENODEV;
-
-	rc = 0;
-	read_lock_bh(&hvc_iucv_filter_lock);
-	for (index = 0; index < hvc_iucv_filter_size; index++) {
-		start = hvc_iucv_filter + (8 * index);
-		end   = memchr(start, ' ', 8);
-		len   = (end) ? end - start : 8;
-		memcpy(buffer + rc, start, len);
-		rc += len;
-		buffer[rc++] = ',';
-	}
-	read_unlock_bh(&hvc_iucv_filter_lock);
-	if (rc)
-		buffer[--rc] = '\0';	/* replace last comma and update rc */
-	return rc;
-}
-
-#define param_check_vmidfilter(name, p) __param_check(name, p, void)
-
-static struct kernel_param_ops param_ops_vmidfilter = {
-	.set = param_set_vmidfilter,
-	.get = param_get_vmidfilter,
-};
-
-/**
- * hvc_iucv_init() - z/VM IUCV HVC device driver initialization
- */
-static int __init hvc_iucv_init(void)
-{
-	int rc;
-	unsigned int i;
-
-	if (!hvc_iucv_devices)
-		return -ENODEV;
-
-	if (!MACHINE_IS_VM) {
-		pr_notice("The z/VM IUCV HVC device driver cannot "
-			   "be used without z/VM\n");
-		rc = -ENODEV;
-		goto out_error;
-	}
-
-	if (hvc_iucv_devices > MAX_HVC_IUCV_LINES) {
-		pr_err("%lu is not a valid value for the hvc_iucv= "
-			"kernel parameter\n", hvc_iucv_devices);
-		rc = -EINVAL;
-		goto out_error;
-	}
-
-	/* register IUCV HVC device driver */
-	rc = driver_register(&hvc_iucv_driver);
-	if (rc)
-		goto out_error;
-
-	/* parse hvc_iucv_allow string and create z/VM user ID filter list */
-	if (hvc_iucv_filter_string) {
-		rc = hvc_iucv_setup_filter(hvc_iucv_filter_string);
-		switch (rc) {
-		case 0:
-			break;
-		case -ENOMEM:
-			pr_err("Allocating memory failed with "
-				"reason code=%d\n", 3);
-			goto out_error;
-		case -EINVAL:
-			pr_err("hvc_iucv_allow= does not specify a valid "
-				"z/VM user ID list\n");
-			goto out_error;
-		case -ENOSPC:
-			pr_err("hvc_iucv_allow= specifies too many "
-				"z/VM user IDs\n");
-			goto out_error;
-		default:
-			goto out_error;
-		}
-	}
-
-	hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT,
-					   sizeof(struct iucv_tty_buffer),
-					   0, 0, NULL);
-	if (!hvc_iucv_buffer_cache) {
-		pr_err("Allocating memory failed with reason code=%d\n", 1);
-		rc = -ENOMEM;
-		goto out_error;
-	}
-
-	hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR,
-						    hvc_iucv_buffer_cache);
-	if (!hvc_iucv_mempool) {
-		pr_err("Allocating memory failed with reason code=%d\n", 2);
-		kmem_cache_destroy(hvc_iucv_buffer_cache);
-		rc = -ENOMEM;
-		goto out_error;
-	}
-
-	/* register the first terminal device as console
-	 * (must be done before allocating hvc terminal devices) */
-	rc = hvc_instantiate(HVC_IUCV_MAGIC, IUCV_HVC_CON_IDX, &hvc_iucv_ops);
-	if (rc) {
-		pr_err("Registering HVC terminal device as "
-		       "Linux console failed\n");
-		goto out_error_memory;
-	}
-
-	/* allocate hvc_iucv_private structs */
-	for (i = 0; i < hvc_iucv_devices; i++) {
-		rc = hvc_iucv_alloc(i, (i == IUCV_HVC_CON_IDX) ? 1 : 0);
-		if (rc) {
-			pr_err("Creating a new HVC terminal device "
-				"failed with error code=%d\n", rc);
-			goto out_error_hvc;
-		}
-	}
-
-	/* register IUCV callback handler */
-	rc = iucv_register(&hvc_iucv_handler, 0);
-	if (rc) {
-		pr_err("Registering IUCV handlers failed with error code=%d\n",
-			rc);
-		goto out_error_hvc;
-	}
-
-	return 0;
-
-out_error_hvc:
-	for (i = 0; i < hvc_iucv_devices; i++)
-		if (hvc_iucv_table[i])
-			hvc_iucv_destroy(hvc_iucv_table[i]);
-out_error_memory:
-	mempool_destroy(hvc_iucv_mempool);
-	kmem_cache_destroy(hvc_iucv_buffer_cache);
-out_error:
-	if (hvc_iucv_filter)
-		kfree(hvc_iucv_filter);
-	hvc_iucv_devices = 0; /* ensure that we do not provide any device */
-	return rc;
-}
-
-/**
- * hvc_iucv_config() - Parsing of hvc_iucv=  kernel command line parameter
- * @val:	Parameter value (numeric)
- */
-static	int __init hvc_iucv_config(char *val)
-{
-	 return strict_strtoul(val, 10, &hvc_iucv_devices);
-}
-
-
-device_initcall(hvc_iucv_init);
-__setup("hvc_iucv=", hvc_iucv_config);
-core_param(hvc_iucv_allow, hvc_iucv_filter, vmidfilter, 0640);