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[S390] s390/hvc_console: z/VM IUCV hypervisor console support

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This patch introduces a new hypervisor console (HVC) back-end that provides
terminal access over the z/VM inter-user communication vehicle (IUCV).

The z/VM IUCV communication is independent of the regular tcp/ip network
and allows access even if there is no network connection between two
z/VM guest virtual machines.
The z/VM IUCV hypervisor console back-end helps the user to access a
z/VM guest virtual machine that lacks of network connectivity; and thus,
provides a "full-screen" terminal alternative to 3215/3270 terminal sessions.

Use the hvc_iucv=[0..8] kernel boot parameter to specify the number of
HVC terminals using a z/VM IUCV back-end.

A recent version of the s390-tools package is required to establish a
terminal connection to a z/VM IUCV hypervisor console back-end.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2008-12-25 13:38:57 +01:00 committed by Martin Schwidefsky
parent 5d360a75f8
commit 44a01d5ba8
3 changed files with 861 additions and 0 deletions
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10
drivers/char/Kconfig
View File

@ -622,6 +622,16 @@ config HVC_BEAT
help
Toshiba's Cell Reference Set Beat Console device driver
config HVC_IUCV
bool "z/VM IUCV Hypervisor console support (VM only)"
depends on S390
select HVC_DRIVER
select IUCV
default y
help
This driver provides a Hypervisor console (HVC) back-end to access
a Linux (console) terminal via a z/VM IUCV communication path.
config HVC_XEN
bool "Xen Hypervisor Console support"
depends on XEN

1
drivers/char/Makefile
View File

@ -50,6 +50,7 @@ obj-$(CONFIG_HVC_BEAT) += hvc_beat.o
obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
obj-$(CONFIG_HVC_IRQ) += hvc_irq.o
obj-$(CONFIG_HVC_XEN) += hvc_xen.o
obj-$(CONFIG_HVC_IUCV) += hvc_iucv.o
obj-$(CONFIG_VIRTIO_CONSOLE) += virtio_console.o
obj-$(CONFIG_RAW_DRIVER) += raw.o
obj-$(CONFIG_SGI_SNSC) += snsc.o snsc_event.o

850
drivers/char/hvc_iucv.c Normal file
View File

@ -0,0 +1,850 @@
/*
* hvc_iucv.c - z/VM IUCV back-end for the Hypervisor Console (HVC)
*
* This back-end for HVC provides terminal access via
* z/VM IUCV communication paths.
*
* Copyright IBM Corp. 2008.
*
* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
*/
#define KMSG_COMPONENT "hvc_iucv"
#include <linux/types.h>
#include <asm/ebcdic.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <net/iucv/iucv.h>
#include "hvc_console.h"
/* HVC backend for z/VM IUCV */
#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 */
#define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, 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));
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 console struct reference */
u8 srv_name[8]; /* IUCV service name (ebcdic) */
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 */
struct list_head tty_outqueue; /* outgoing IUCV messages */
struct list_head tty_inqueue; /* incoming IUCV messages */
};
struct iucv_tty_buffer {
struct list_head list; /* list pointer */
struct iucv_message msg; /* store an incoming 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 parameters */
static unsigned long hvc_iucv_devices;
/* Array of allocated hvc iucv tty lines... */
static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];
/* 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() - Returns 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.
* 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(struct iucv_tty_buffer));
if (size > 0) {
bufp->msg.length = MSG_SIZE(size);
bufp->mbuf = kmalloc(bufp->msg.length, flags);
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.
*
* The destroy_tty_buffer() function frees the internal data buffer and returns
* the struct iucv_tty_buffer element back to the mempool for freeing.
*/
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 head pointer to a list containing struct iucv_tty_buffer
* elements.
*
* Calls destroy_tty_buffer() for each struct iucv_tty_buffer element in the
* list @list.
*/
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 console buffer.
* @priv: Pointer to hvc_iucv_private structure.
* @buf: HVC console buffer for writing received terminal data.
* @count: HVC console 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, then the
* message is kept on the input queue and @has_more_data is set to 1.
* If the message data has been entirely 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 console 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 console 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 a 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);
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;
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_console thread calls this method to read characters from
* the terminal backend. 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_send() - Send an IUCV message containing terminal data.
* @priv: Pointer to struct hvc_iucv_private instance.
* @buf: Buffer containing data to send.
* @size: Size of buffer and amount of data to send.
*
* If an IUCV communication path is established, the function copies the buffer
* data to a newly allocated struct iucv_tty_buffer element, sends the data and
* puts the element to the outqueue.
*
* If there is no IUCV communication path established, the function returns 0.
* If an existing IUCV communicaton path has been severed, the function returns
* -EPIPE (can be passed to HVC layer to cause a tty hangup).
*/
static int hvc_iucv_send(struct hvc_iucv_private *priv, const char *buf,
int count)
{
struct iucv_tty_buffer *sb;
int rc;
u16 len;
if (priv->iucv_state == IUCV_SEVERED)
return -EPIPE;
if (priv->iucv_state == IUCV_DISCONN)
return 0;
len = min_t(u16, MSG_MAX_DATALEN, count);
/* allocate internal buffer to store msg data and also compute total
* message length */
sb = alloc_tty_buffer(len, GFP_ATOMIC);
if (!sb)
return -ENOMEM;
sb->mbuf->datalen = len;
memcpy(sb->mbuf->data, buf, len);
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) {
list_del(&sb->list);
destroy_tty_buffer(sb);
len = 0;
}
return len;
}
/**
* 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_console thread calls this method to write characters from
* to the terminal backend.
* The function calls hvc_iucv_send() under the lock of the
* struct hvc_iucv_private instance that corresponds to the tty @vtermno.
*
* 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 sent;
if (count <= 0)
return 0;
if (!priv)
return -ENODEV;
spin_lock(&priv->lock);
sent = hvc_iucv_send(priv, buf, count);
spin_unlock(&priv->lock);
return sent;
}
/**
* 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_OPEN 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 function if the tty portion is finally closed.
* @priv: Pointer to the struct hvc_iucv_private instance.
*
* The functions severs the established IUCV communication path (if any), and
* destroy struct iucv_tty_buffer elements from the in- and outqueue. Finally,
* the functions resets the states to TTY_CLOSED and IUCV_DISCONN.
*/
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;
}
/**
* 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 backend that a tty hangup (carrier loss,
* virtual or otherwise) has occured.
*
* The HVC backend for z/VM IUCV 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 (e.g. getty) and an established IUCV path has been
* severed (we caused the tty hangup in that case), then the functions invokes
* hvc_iucv_cleanup() to clean up.
*
* 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;
spin_lock_bh(&priv->lock);
/* NOTE: If the hangup was scheduled by ourself (from the iucv
* path_servered callback [IUCV_SEVERED]), then we have to
* finally clean up the tty backend structure and 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 backend that the last tty device file
* descriptor 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;
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_path_pending() - IUCV handler to process a connection request.
* @path: Pending path (struct iucv_path)
* @ipvmid: Originator z/VM system identifier
* @ipuser: User specified data for this path
* (AF_IUCV: port/service name and originator port)
*
* The function uses the @ipuser data to check to determine if the pending
* path belongs to a terminal managed by this HVC backend.
* If the check is successful, then an additional check is done to ensure
* that a terminal cannot be accessed multiple times (only one connection
* to a terminal is allowed). In that particular case, the pending path is
* severed. If it is the first connection, the pending path is accepted and
* associated to the struct hvc_iucv_private. The iucv state is updated to
* reflect that a communication path has been established.
*
* Returns 0 if the path belongs to a terminal managed by the this HVC backend;
* 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];
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;
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;
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)
*
* The function also severs the path (as required by the IUCV protocol) and
* sets the iucv state to IUCV_SEVERED for the associated struct
* hvc_iucv_private instance. Later, the IUCV_SEVERED state triggers a tty
* hangup (hvc_iucv_get_chars() / hvc_iucv_write()).
*
* If tty portion of the HVC is closed then clean up the outqueue in addition.
*
* 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;
spin_lock(&priv->lock);
priv->iucv_state = IUCV_SEVERED;
/* NOTE: If the tty has not yet been opened by a getty program
* (e.g. to see console messages), then cleanup the
* hvc_iucv_private structure to allow re-connects.
*
* If the tty has been opened, the get_chars() callback returns
* -EPIPE to signal the hvc console layer to hang up the tty. */
priv->path = NULL;
if (priv->tty_state == TTY_CLOSED)
hvc_iucv_cleanup(priv);
spin_unlock(&priv->lock);
/* finally sever path (outside of priv->lock due to lock ordering) */
iucv_path_sever(path, ipuser);
iucv_path_free(path);
}
/**
* 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 stores an incoming message on the input queue for later
* processing (by hvc_iucv_get_chars() / hvc_iucv_write()).
* However, 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;
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 buffer an empty buffer element */
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(); /* wakup hvc console 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 and the
* message is removed from the outqueue. Additional delivery information
* can be found in 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;
}
spin_unlock(&priv->lock);
destroy_tty_buffer_list(&list_remove);
}
/* HVC operations */
static 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,
};
/**
* hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
* @id: hvc_iucv_table index
*
* This function allocates a new hvc_iucv_private struct and put the
* instance into hvc_iucv_table at index @id.
* Returns 0 on success; otherwise non-zero.
*/
static int __init hvc_iucv_alloc(int id)
{
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);
/* Finally allocate hvc */
priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id,
HVC_IUCV_MAGIC + id, &hvc_iucv_ops, PAGE_SIZE);
if (IS_ERR(priv->hvc)) {
rc = PTR_ERR(priv->hvc);
kfree(priv);
return rc;
}
/* setup iucv related information */
snprintf(name, 9, "ihvc%-4d", id);
memcpy(priv->srv_name, name, 8);
ASCEBC(priv->srv_name, 8);
hvc_iucv_table[id] = priv;
return 0;
}
/**
* hvc_iucv_init() - Initialization of HVC backend for z/VM IUCV
*/
static int __init hvc_iucv_init(void)
{
int rc, i;
if (!MACHINE_IS_VM) {
pr_warning("The z/VM IUCV Hypervisor console cannot be "
"used without z/VM.\n");
return -ENODEV;
}
if (!hvc_iucv_devices)
return -ENODEV;
if (hvc_iucv_devices > MAX_HVC_IUCV_LINES)
return -EINVAL;
hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT,
sizeof(struct iucv_tty_buffer),
0, 0, NULL);
if (!hvc_iucv_buffer_cache) {
pr_err("Not enough memory for driver initialization "
"(rs=%d).\n", 1);
return -ENOMEM;
}
hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR,
hvc_iucv_buffer_cache);
if (!hvc_iucv_mempool) {
pr_err("Not enough memory for driver initialization "
"(rs=%d).\n", 2);
kmem_cache_destroy(hvc_iucv_buffer_cache);
return -ENOMEM;
}
/* allocate hvc_iucv_private structs */
for (i = 0; i < hvc_iucv_devices; i++) {
rc = hvc_iucv_alloc(i);
if (rc) {
pr_err("Could not create new z/VM IUCV HVC backend "
"rc=%d.\n", rc);
goto out_error_hvc;
}
}
/* register IUCV callback handler */
rc = iucv_register(&hvc_iucv_handler, 0);
if (rc) {
pr_err("Could not register iucv handler (rc=%d).\n", rc);
goto out_error_iucv;
}
return 0;
out_error_iucv:
iucv_unregister(&hvc_iucv_handler, 0);
out_error_hvc:
for (i = 0; i < hvc_iucv_devices; i++)
if (hvc_iucv_table[i]) {
if (hvc_iucv_table[i]->hvc)
hvc_remove(hvc_iucv_table[i]->hvc);
kfree(hvc_iucv_table[i]);
}
mempool_destroy(hvc_iucv_mempool);
kmem_cache_destroy(hvc_iucv_buffer_cache);
return rc;
}
/**
* hvc_iucv_console_init() - Early console initialization
*/
static int __init hvc_iucv_console_init(void)
{
if (!MACHINE_IS_VM || !hvc_iucv_devices)
return -ENODEV;
return hvc_instantiate(HVC_IUCV_MAGIC, 0, &hvc_iucv_ops);
}
/**
* 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);
}
module_init(hvc_iucv_init);
console_initcall(hvc_iucv_console_init);
__setup("hvc_iucv=", hvc_iucv_config);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("HVC back-end for z/VM IUCV.");
MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>");