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Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

Browse source 
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] update documentation for hvc_iucv kernel parameter.
  [S390] hvc_iucv: Special handling of IUCV HVC devices
  [S390] hvc_iucv: Refactor console and device initialization
  [S390] hvc_iucv: Update function documentation
  [S390] hvc_iucv: Limit rate of outgoing IUCV messages
  [S390] hvc_iucv: Change IUCV term id and use one device as default
  [S390] Use unsigned long long for u64 on 64bit.
  [S390] qdio: fix broken pointer in case of CONFIG_DEBUG_FS is disabled
  [S390] vdso: compile fix
  [S390] remove code for oldselect system call
  [S390] types: add/fix types.h include in header files
  [S390] dasd: add device attribute to disable blocking on lost paths
  [S390] dasd: send change uevents for dasd block devices
  [S390] tape block: fix dependencies
  [S390] asm-s390/posix_types.h: drop __USE_ALL usage
  [S390] gettimeofday.S: removed duplicated #includes
  [S390] ptrace: no extern declarations for userspace
This commit is contained in:
Linus Torvalds 2009-01-09 13:56:06 -08:00
commit 7d671f3e71
28 changed files with 376 additions and 203 deletions
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420
drivers/char/hvc_iucv.c
View file

@ -1,26 +1,30 @@
/*
* hvc_iucv.c - z/VM IUCV back-end for the Hypervisor Console (HVC)
* hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver
*
* This back-end for HVC provides terminal access via
* This HVC device driver provides terminal access using
* z/VM IUCV communication paths.
*
* Copyright IBM Corp. 2008.
* Copyright IBM Corp. 2008
*
* 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 <asm/ebcdic.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/wait.h>
#include <net/iucv/iucv.h>
#include "hvc_console.h"
/* HVC backend for z/VM IUCV */
/* 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)
@ -33,14 +37,14 @@
#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)
#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,
@ -54,19 +58,26 @@ enum tty_state_t {
};
struct hvc_iucv_private {
struct hvc_struct *hvc; /* HVC console struct reference */
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 iucv_tty_buffer {
struct list_head list; /* list pointer */
struct iucv_message msg; /* store an incoming IUCV message */
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 */
};
@ -78,11 +89,12 @@ 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;
/* 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)
/* Kmem cache and mempool for iucv_tty_buffer elements */
static struct kmem_cache *hvc_iucv_buffer_cache;
@ -112,7 +124,7 @@ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
}
/**
* alloc_tty_buffer() - Returns a new struct iucv_tty_buffer element.
* 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.
*
@ -120,7 +132,6 @@ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
* 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)
@ -130,7 +141,7 @@ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
bufp = mempool_alloc(hvc_iucv_mempool, flags);
if (!bufp)
return NULL;
memset(bufp, 0, sizeof(struct iucv_tty_buffer));
memset(bufp, 0, sizeof(*bufp));
if (size > 0) {
bufp->msg.length = MSG_SIZE(size);
@ -149,9 +160,6 @@ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
/**
* 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)
{
@ -161,11 +169,7 @@ static void destroy_tty_buffer(struct iucv_tty_buffer *bufp)
/**
* 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.
* @list: List containing struct iucv_tty_buffer elements.
*/
static void destroy_tty_buffer_list(struct list_head *list)
{
@ -178,24 +182,24 @@ static void destroy_tty_buffer_list(struct list_head *list)
}
/**
* 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.
* 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, then the
* 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 the message data has been entirely written, the message is removed from
* 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 console layer).
* 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)
@ -204,12 +208,12 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
int written;
int rc;
/* Immediately return if there is no IUCV connection */
/* 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 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;
@ -217,7 +221,7 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
if (list_empty(&priv->tty_inqueue))
return 0;
/* receive a iucv message and flip data to the tty (ldisc) */
/* 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;
@ -260,7 +264,7 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
case MSG_TYPE_WINSIZE:
if (rb->mbuf->datalen != sizeof(struct winsize))
break;
hvc_resize(priv->hvc, *((struct winsize *)rb->mbuf->data));
hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));
break;
case MSG_TYPE_ERROR: /* ignored ... */
@ -284,10 +288,9 @@ out_written:
* @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.
* 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
@ -318,66 +321,122 @@ static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count)
}
/**
* hvc_iucv_send() - Send an IUCV message containing terminal data.
* hvc_iucv_queue() - Buffer terminal data for sending.
* @priv: Pointer to struct hvc_iucv_private instance.
* @buf: Buffer containing data to send.
* @size: Size of buffer and amount of data to send.
* @count: 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.
* 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 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).
* 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_send(struct hvc_iucv_private *priv, const char *buf,
int count)
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;
u16 len;
int rc, len;
if (priv->iucv_state == IUCV_SEVERED)
return -EPIPE;
if (priv->iucv_state == IUCV_DISCONN)
return 0;
return -EIO;
len = min_t(u16, MSG_MAX_DATALEN, count);
if (!priv->sndbuf_len)
return 0;
/* allocate internal buffer to store msg data and also compute total
* message length */
sb = alloc_tty_buffer(len, GFP_ATOMIC);
sb = alloc_tty_buffer(priv->sndbuf_len, GFP_ATOMIC);
if (!sb)
return -ENOMEM;
sb->mbuf->datalen = len;
memcpy(sb->mbuf->data, buf, len);
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 = 0;
}
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_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.
* 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.
@ -385,7 +444,7 @@ static int hvc_iucv_send(struct hvc_iucv_private *priv, const char *buf,
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;
int queued;
if (count <= 0)
return 0;
@ -394,10 +453,10 @@ static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count)
return -ENODEV;
spin_lock(&priv->lock);
sent = hvc_iucv_send(priv, buf, count);
queued = hvc_iucv_queue(priv, buf, count);
spin_unlock(&priv->lock);
return sent;
return queued;
}
/**
@ -406,7 +465,7 @@ static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count)
* @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
* 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
@ -427,12 +486,8 @@ static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id)
}
/**
* hvc_iucv_cleanup() - Clean up function if the tty portion is finally closed.
* hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
* @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)
{
@ -441,25 +496,62 @@ static void hvc_iucv_cleanup(struct hvc_iucv_private *priv)
priv->tty_state = TTY_CLOSED;
priv->iucv_state = IUCV_DISCONN;
priv->sndbuf_len = 0;
}
/**
* 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.
* 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.
*
* This routine notifies the HVC backend that a tty hangup (carrier loss,
* 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);
}
/**
* 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 HVC backend for z/VM IUCV ignores virtual hangups (vhangup()), to keep
* an existing IUCV communication path established.
* 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 (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.
* 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
*/
@ -471,12 +563,12 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int 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]), then we have to
* finally clean up the tty backend structure and set state to
* TTY_CLOSED.
*
* 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
@ -494,10 +586,9 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
* @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.
* 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
*/
@ -510,6 +601,8 @@ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
if (!priv)
return;
flush_sndbuf_sync(priv);
spin_lock_bh(&priv->lock);
path = priv->path; /* save reference to IUCV path */
priv->path = NULL;
@ -527,20 +620,18 @@ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
/**
* hvc_iucv_path_pending() - IUCV handler to process a connection request.
* @path: Pending path (struct iucv_path)
* @ipvmid: Originator z/VM system identifier
* @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 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.
* 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 the path belongs to a terminal managed by the this HVC backend;
* 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
@ -559,7 +650,6 @@ static int hvc_iucv_path_pending(struct iucv_path *path,
priv = hvc_iucv_table[i];
break;
}
if (!priv)
return -ENODEV;
@ -588,6 +678,9 @@ static int hvc_iucv_path_pending(struct iucv_path *path,
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;
@ -603,8 +696,7 @@ out_path_handled:
* 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.
* If tty portion of the HVC is closed, clean up the outqueue.
*
* Locking: struct hvc_iucv_private->lock
*/
@ -615,15 +707,25 @@ static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
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 not yet been opened, clean up the hvc_iucv_private
* structure to allow re-connects.
* This is also done for our console device because console hangups
* are handled specially and no notifier is called by HVC.
* The tty session is active (TTY_OPEN) and ready for 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. */
* If it has been opened, let get_chars() return -EPIPE to signal the
* HVC layer to hang up the tty.
* If so, we need to wake up the HVC thread to call get_chars()...
*/
priv->path = NULL;
if (priv->tty_state == TTY_CLOSED)
hvc_iucv_cleanup(priv);
else
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) */
@ -636,9 +738,9 @@ static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
* @path: Pending path (struct iucv_path)
* @msg: Pointer to the IUCV message
*
* The function stores an incoming message on the input queue for later
* The function puts 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.
* If the tty has not yet been opened, the message is rejected.
*
* Locking: struct hvc_iucv_private->lock
*/
@ -648,6 +750,12 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
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 */
@ -656,7 +764,7 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
goto unlock_return;
}
/* allocate buffer an empty buffer element */
/* allocate tty buffer to save iucv msg only */
rb = alloc_tty_buffer(0, GFP_ATOMIC);
if (!rb) {
iucv_message_reject(path, msg);
@ -666,7 +774,7 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
list_add_tail(&rb->list, &priv->tty_inqueue);
hvc_kick(); /* wakup hvc console thread */
hvc_kick(); /* wake up hvc thread */
unlock_return:
spin_unlock(&priv->lock);
@ -677,10 +785,10 @@ unlock_return:
* @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)).
* 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
*/
@ -697,6 +805,7 @@ static void hvc_iucv_msg_complete(struct iucv_path *path,
list_move(&ent->list, &list_remove);
break;
}
wake_up(&priv->sndbuf_waitq);
spin_unlock(&priv->lock);
destroy_tty_buffer_list(&list_remove);
}
@ -713,13 +822,14 @@ static struct hv_ops hvc_iucv_ops = {
/**
* hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
* @id: hvc_iucv_table index
* @id: hvc_iucv_table index
* @is_console: Flag if the instance is used as Linux console
*
* This function allocates a new hvc_iucv_private struct and put the
* instance into hvc_iucv_table at index @id.
* 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)
static int __init hvc_iucv_alloc(int id, unsigned int is_console)
{
struct hvc_iucv_private *priv;
char name[9];
@ -732,18 +842,33 @@ static int __init hvc_iucv_alloc(int id)
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);
/* Finally allocate hvc */
priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id,
HVC_IUCV_MAGIC + id, &hvc_iucv_ops, PAGE_SIZE);
priv->sndbuf = (void *) get_zeroed_page(GFP_KERNEL);
if (!priv->sndbuf) {
kfree(priv);
return -ENOMEM;
}
/* set console flag */
priv->is_console = is_console;
/* finally allocate hvc */
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);
free_page((unsigned long) priv->sndbuf);
kfree(priv);
return rc;
}
/* notify HVC thread instead of using polling */
priv->hvc->irq_requested = 1;
/* setup iucv related information */
snprintf(name, 9, "ihvc%-4d", id);
snprintf(name, 9, "lnxhvc%-2d", id);
memcpy(priv->srv_name, name, 8);
ASCEBC(priv->srv_name, 8);
@ -752,15 +877,16 @@ static int __init hvc_iucv_alloc(int id)
}
/**
* hvc_iucv_init() - Initialization of HVC backend for z/VM IUCV
* hvc_iucv_init() - z/VM IUCV HVC device driver initialization
*/
static int __init hvc_iucv_init(void)
{
int rc, i;
int rc;
unsigned int i;
if (!MACHINE_IS_VM) {
pr_warning("The z/VM IUCV Hypervisor console cannot be "
"used without z/VM.\n");
pr_info("The z/VM IUCV HVC device driver cannot "
"be used without z/VM\n");
return -ENODEV;
}
@ -774,26 +900,33 @@ static int __init hvc_iucv_init(void)
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);
pr_err("Allocating memory failed with reason code=%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);
pr_err("Allocating memory failed with reason code=%d\n", 2);
kmem_cache_destroy(hvc_iucv_buffer_cache);
return -ENOMEM;
}
/* 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);
rc = hvc_iucv_alloc(i, (i == IUCV_HVC_CON_IDX) ? 1 : 0);
if (rc) {
pr_err("Could not create new z/VM IUCV HVC backend "
"rc=%d.\n", rc);
pr_err("Creating a new HVC terminal device "
"failed with error code=%d\n", rc);
goto out_error_hvc;
}
}
@ -801,7 +934,8 @@ static int __init hvc_iucv_init(void)
/* register IUCV callback handler */
rc = iucv_register(&hvc_iucv_handler, 0);
if (rc) {
pr_err("Could not register iucv handler (rc=%d).\n", rc);
pr_err("Registering IUCV handlers failed with error code=%d\n",
rc);
goto out_error_iucv;
}
@ -816,21 +950,12 @@ out_error_hvc:
hvc_remove(hvc_iucv_table[i]->hvc);
kfree(hvc_iucv_table[i]);
}
out_error_memory:
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)
@ -841,10 +966,5 @@ static int __init hvc_iucv_config(char *val)
}
module_init(hvc_iucv_init);
console_initcall(hvc_iucv_console_init);
device_initcall(hvc_iucv_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>");