mirror of https://gitee.com/openkylin/linux.git
[S390] hvc_iucv: Update function documentation
Update documentation of functions. 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
Martin Schwidefsky
parent
c45ce4b577
commit
17e19f04ac
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@ -1,14 +1,15 @@
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/*
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* hvc_iucv.c - z/VM IUCV back-end for the Hypervisor Console (HVC)
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* hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver
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*
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* This back-end for HVC provides terminal access via
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* This HVC device driver provides terminal access using
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* z/VM IUCV communication paths.
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*
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* Copyright IBM Corp. 2008.
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* Copyright IBM Corp. 2008
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*
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* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*/
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#define KMSG_COMPONENT "hvc_iucv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/types.h>
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#include <asm/ebcdic.h>
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@ -22,7 +23,7 @@
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#include "hvc_console.h"
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/* HVC backend for z/VM IUCV */
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/* General device driver settings */
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#define HVC_IUCV_MAGIC 0xc9e4c3e5
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#define MAX_HVC_IUCV_LINES HVC_ALLOC_TTY_ADAPTERS
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#define MEMPOOL_MIN_NR (PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4)
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@ -35,7 +36,6 @@
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#define MSG_TYPE_WINSIZE 0x08 /* Terminal window size update */
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#define MSG_TYPE_DATA 0x10 /* Terminal data */
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#define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, data))
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struct iucv_tty_msg {
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u8 version; /* Message version */
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u8 type; /* Message type */
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@ -43,6 +43,7 @@ struct iucv_tty_msg {
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u16 datalen; /* Payload length */
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u8 data[]; /* Payload buffer */
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} __attribute__((packed));
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#define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, data))
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enum iucv_state_t {
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IUCV_DISCONN = 0,
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@ -56,7 +57,7 @@ enum tty_state_t {
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};
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struct hvc_iucv_private {
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struct hvc_struct *hvc; /* HVC console struct reference */
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struct hvc_struct *hvc; /* HVC struct reference */
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u8 srv_name[8]; /* IUCV service name (ebcdic) */
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enum iucv_state_t iucv_state; /* IUCV connection status */
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enum tty_state_t tty_state; /* TTY status */
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@ -74,7 +75,7 @@ struct hvc_iucv_private {
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struct iucv_tty_buffer {
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struct list_head list; /* list pointer */
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struct iucv_message msg; /* store an incoming IUCV message */
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struct iucv_message msg; /* store an IUCV message */
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size_t offset; /* data buffer offset */
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struct iucv_tty_msg *mbuf; /* buffer to store input/output data */
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};
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@ -120,7 +121,7 @@ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
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}
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/**
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* alloc_tty_buffer() - Returns a new struct iucv_tty_buffer element.
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* alloc_tty_buffer() - Return a new struct iucv_tty_buffer element.
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* @size: Size of the internal buffer used to store data.
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* @flags: Memory allocation flags passed to mempool.
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*
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@ -128,7 +129,6 @@ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
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* allocates an internal data buffer with the specified size @size.
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* Note: The total message size arises from the internal buffer size and the
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* members of the iucv_tty_msg structure.
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*
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* The function returns NULL if memory allocation has failed.
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*/
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static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
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@ -157,9 +157,6 @@ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
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/**
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* destroy_tty_buffer() - destroy struct iucv_tty_buffer element.
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* @bufp: Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL.
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*
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* The destroy_tty_buffer() function frees the internal data buffer and returns
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* the struct iucv_tty_buffer element back to the mempool for freeing.
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*/
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static void destroy_tty_buffer(struct iucv_tty_buffer *bufp)
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{
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@ -169,11 +166,7 @@ static void destroy_tty_buffer(struct iucv_tty_buffer *bufp)
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/**
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* destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element.
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* @list: List head pointer to a list containing struct iucv_tty_buffer
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* elements.
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*
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* Calls destroy_tty_buffer() for each struct iucv_tty_buffer element in the
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* list @list.
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* @list: List containing struct iucv_tty_buffer elements.
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*/
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static void destroy_tty_buffer_list(struct list_head *list)
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{
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@ -186,24 +179,24 @@ static void destroy_tty_buffer_list(struct list_head *list)
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}
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/**
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* hvc_iucv_write() - Receive IUCV message write data to HVC console buffer.
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* @priv: Pointer to hvc_iucv_private structure.
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* @buf: HVC console buffer for writing received terminal data.
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* @count: HVC console buffer size.
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* hvc_iucv_write() - Receive IUCV message & write data to HVC buffer.
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* @priv: Pointer to struct hvc_iucv_private
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* @buf: HVC buffer for writing received terminal data.
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* @count: HVC buffer size.
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* @has_more_data: Pointer to an int variable.
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*
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* The function picks up pending messages from the input queue and receives
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* the message data that is then written to the specified buffer @buf.
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* If the buffer size @count is less than the data message size, then the
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* If the buffer size @count is less than the data message size, the
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* message is kept on the input queue and @has_more_data is set to 1.
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* If the message data has been entirely written, the message is removed from
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* If all message data has been written, the message is removed from
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* the input queue.
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*
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* The function returns the number of bytes written to the terminal, zero if
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* there are no pending data messages available or if there is no established
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* IUCV path.
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* If the IUCV path has been severed, then -EPIPE is returned to cause a
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* hang up (that is issued by the HVC console layer).
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* hang up (that is issued by the HVC layer).
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*/
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static int hvc_iucv_write(struct hvc_iucv_private *priv,
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char *buf, int count, int *has_more_data)
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@ -212,12 +205,12 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
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int written;
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int rc;
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/* Immediately return if there is no IUCV connection */
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/* immediately return if there is no IUCV connection */
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if (priv->iucv_state == IUCV_DISCONN)
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return 0;
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/* If the IUCV path has been severed, return -EPIPE to inform the
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* hvc console layer to hang up the tty device. */
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/* if the IUCV path has been severed, return -EPIPE to inform the
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* HVC layer to hang up the tty device. */
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if (priv->iucv_state == IUCV_SEVERED)
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return -EPIPE;
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@ -225,7 +218,7 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
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if (list_empty(&priv->tty_inqueue))
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return 0;
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/* receive a iucv message and flip data to the tty (ldisc) */
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/* receive an iucv message and flip data to the tty (ldisc) */
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rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list);
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written = 0;
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@ -268,7 +261,7 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
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case MSG_TYPE_WINSIZE:
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if (rb->mbuf->datalen != sizeof(struct winsize))
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break;
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hvc_resize(priv->hvc, *((struct winsize *)rb->mbuf->data));
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hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));
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break;
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case MSG_TYPE_ERROR: /* ignored ... */
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@ -292,10 +285,9 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv,
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* @buf: Pointer to a buffer to store data
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* @count: Size of buffer available for writing
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*
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* The hvc_console thread calls this method to read characters from
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* the terminal backend. If an IUCV communication path has been established,
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* pending IUCV messages are received and data is copied into buffer @buf
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* up to @count bytes.
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* The HVC thread calls this method to read characters from the back-end.
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* If an IUCV communication path has been established, pending IUCV messages
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* are received and data is copied into buffer @buf up to @count bytes.
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*
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* Locking: The routine gets called under an irqsave() spinlock; and
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* the routine locks the struct hvc_iucv_private->lock to call
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@ -332,17 +324,17 @@ static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count)
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* @count: Size of buffer and amount of data to send.
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*
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* The function queues data for sending. To actually send the buffered data,
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* a work queue function is * scheduled (with QUEUE_SNDBUF_DELAY).
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* a work queue function is scheduled (with QUEUE_SNDBUF_DELAY).
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* The function returns the number of data bytes that has been buffered.
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*
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* If the device is not connected, data is ignored and the function returns
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* @count.
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* If the buffer is full, the function returns 0.
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* If an existing IUCV communicaton path has been severed, the function returns
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* -EPIPE (can be passed to HVC layer to cause a tty hangup).
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* If an existing IUCV communicaton path has been severed, -EPIPE is returned
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* (that can be passed to HVC layer to cause a tty hangup).
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*/
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static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf,
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int count)
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int count)
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{
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size_t len;
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@ -369,12 +361,10 @@ static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf,
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* hvc_iucv_send() - Send an IUCV message containing terminal data.
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* @priv: Pointer to struct hvc_iucv_private instance.
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*
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* If an IUCV communication path has been established, the queued data
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* for output are sent via an IUCV message.
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*
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* If there is no IUCV communication path established, the function returns 0.
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* If an existing IUCV communicaton path has been severed, the function returns
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* -EPIPE.
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* If an IUCV communication path has been established, the buffered output data
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* is sent via an IUCV message and the number of bytes sent is returned.
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* Returns 0 if there is no established IUCV communication path or
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* -EPIPE if an existing IUCV communicaton path has been severed.
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*/
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static int hvc_iucv_send(struct hvc_iucv_private *priv)
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{
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@ -420,15 +410,14 @@ static int hvc_iucv_send(struct hvc_iucv_private *priv)
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* hvc_iucv_sndbuf_work() - Send buffered data over IUCV
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* @work: Work structure.
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*
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* The function sends buffered output data over IUCV and, if necessary,
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* reschedules itself if not all buffered data could be sent.
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* This work queue function sends buffered output data over IUCV and,
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* if not all buffered data could be sent, reschedules itself.
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*/
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static void hvc_iucv_sndbuf_work(struct work_struct *work)
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{
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struct hvc_iucv_private *priv;
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priv = container_of(work, struct hvc_iucv_private, sndbuf_work.work);
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if (!priv)
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return;
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@ -443,10 +432,8 @@ static void hvc_iucv_sndbuf_work(struct work_struct *work)
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* @buf: Pointer to an buffer to read data from
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* @count: Size of buffer available for reading
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*
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* The hvc_console thread calls this method to write characters from
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* to the terminal backend.
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* The function calls hvc_iucv_send() under the lock of the
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* struct hvc_iucv_private instance that corresponds to the tty @vtermno.
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* The HVC thread calls this method to write characters to the back-end.
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* The function calls hvc_iucv_queue() to queue terminal data for sending.
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*
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* Locking: The method gets called under an irqsave() spinlock; and
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* locks struct hvc_iucv_private->lock.
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@ -496,12 +483,8 @@ static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id)
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}
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/**
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* hvc_iucv_cleanup() - Clean up function if the tty portion is finally closed.
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* hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
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* @priv: Pointer to the struct hvc_iucv_private instance.
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*
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* The functions severs the established IUCV communication path (if any), and
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* destroy struct iucv_tty_buffer elements from the in- and outqueue. Finally,
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* the functions resets the states to TTY_CLOSED and IUCV_DISCONN.
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*/
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static void hvc_iucv_cleanup(struct hvc_iucv_private *priv)
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{
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@ -553,22 +536,19 @@ static void flush_sndbuf_sync(struct hvc_iucv_private *priv)
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}
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/**
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* hvc_iucv_notifier_hangup() - HVC notifier for tty hangups.
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* @hp: Pointer to the HVC device (struct hvc_struct)
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* @id: Additional data (originally passed to hvc_alloc): the index of an struct
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* hvc_iucv_private instance.
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* hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups.
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* @hp: Pointer to the HVC device (struct hvc_struct)
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* @id: Additional data (originally passed to hvc_alloc):
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* the index of an struct hvc_iucv_private instance.
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*
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* This routine notifies the HVC backend that a tty hangup (carrier loss,
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* This routine notifies the HVC back-end that a tty hangup (carrier loss,
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* virtual or otherwise) has occured.
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*
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* The HVC backend for z/VM IUCV ignores virtual hangups (vhangup()), to keep
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* an existing IUCV communication path established.
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* The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
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* to keep an existing IUCV communication path established.
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* (Background: vhangup() is called from user space (by getty or login) to
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* disable writing to the tty by other applications).
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*
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* If the tty has been opened (e.g. getty) and an established IUCV path has been
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* severed (we caused the tty hangup in that case), then the functions invokes
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* hvc_iucv_cleanup() to clean up.
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* If the tty has been opened and an established IUCV path has been severed
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* (we caused the tty hangup), the function calls hvc_iucv_cleanup().
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*
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* Locking: struct hvc_iucv_private->lock
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*/
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@ -584,10 +564,8 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
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spin_lock_bh(&priv->lock);
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/* NOTE: If the hangup was scheduled by ourself (from the iucv
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* path_servered callback [IUCV_SEVERED]), then we have to
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* finally clean up the tty backend structure and set state to
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* TTY_CLOSED.
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*
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* path_servered callback [IUCV_SEVERED]), we have to clean up
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* our structure and to set state to TTY_CLOSED.
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* If the tty was hung up otherwise (e.g. vhangup()), then we
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* ignore this hangup and keep an established IUCV path open...
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* (...the reason is that we are not able to connect back to the
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@ -605,10 +583,9 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
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* @id: Additional data (originally passed to hvc_alloc):
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* the index of an struct hvc_iucv_private instance.
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*
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* This routine notifies the HVC backend that the last tty device file
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* descriptor has been closed.
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* The function calls hvc_iucv_cleanup() to clean up the struct hvc_iucv_private
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* instance.
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* This routine notifies the HVC back-end that the last tty device fd has been
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* closed. The function calls hvc_iucv_cleanup() to clean up the struct
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* hvc_iucv_private instance.
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*
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* Locking: struct hvc_iucv_private->lock
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*/
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@ -640,20 +617,18 @@ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
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/**
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* hvc_iucv_path_pending() - IUCV handler to process a connection request.
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* @path: Pending path (struct iucv_path)
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* @ipvmid: Originator z/VM system identifier
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* @ipvmid: z/VM system identifier of originator
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* @ipuser: User specified data for this path
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* (AF_IUCV: port/service name and originator port)
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*
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* The function uses the @ipuser data to check to determine if the pending
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* path belongs to a terminal managed by this HVC backend.
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* If the check is successful, then an additional check is done to ensure
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* that a terminal cannot be accessed multiple times (only one connection
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* to a terminal is allowed). In that particular case, the pending path is
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* severed. If it is the first connection, the pending path is accepted and
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* associated to the struct hvc_iucv_private. The iucv state is updated to
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* reflect that a communication path has been established.
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* The function uses the @ipuser data to determine if the pending path belongs
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* to a terminal managed by this device driver.
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* If the path belongs to this driver, ensure that the terminal is not accessed
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* multiple times (only one connection to a terminal is allowed).
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* If the terminal is not yet connected, the pending path is accepted and is
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* associated to the appropriate struct hvc_iucv_private instance.
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*
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* Returns 0 if the path belongs to a terminal managed by the this HVC backend;
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* Returns 0 if @path belongs to a terminal managed by the this device driver;
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* otherwise returns -ENODEV in order to dispatch this path to other handlers.
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*
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* Locking: struct hvc_iucv_private->lock
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@ -672,7 +647,6 @@ static int hvc_iucv_path_pending(struct iucv_path *path,
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priv = hvc_iucv_table[i];
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break;
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}
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if (!priv)
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return -ENODEV;
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@ -719,8 +693,7 @@ static int hvc_iucv_path_pending(struct iucv_path *path,
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* sets the iucv state to IUCV_SEVERED for the associated struct
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* hvc_iucv_private instance. Later, the IUCV_SEVERED state triggers a tty
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* hangup (hvc_iucv_get_chars() / hvc_iucv_write()).
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*
|
||||
* 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
|
||||
*/
|
||||
|
|
@ -755,9 +728,9 @@ 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
|
||||
*/
|
||||
|
|
@ -773,6 +746,7 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
|
|||
return;
|
||||
}
|
||||
|
||||
|
||||
spin_lock(&priv->lock);
|
||||
|
||||
/* reject messages if tty has not yet been opened */
|
||||
|
|
@ -791,7 +765,7 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
|
|||
|
||||
list_add_tail(&rb->list, &priv->tty_inqueue);
|
||||
|
||||
hvc_kick(); /* wake up hvc console thread */
|
||||
hvc_kick(); /* wake up hvc thread */
|
||||
|
||||
unlock_return:
|
||||
spin_unlock(&priv->lock);
|
||||
|
|
@ -802,10 +776,10 @@ static void hvc_iucv_msg_pending(struct iucv_path *path,
|
|||
* @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
|
||||
*/
|
||||
|
|
@ -841,8 +815,8 @@ static struct hv_ops hvc_iucv_ops = {
|
|||
* 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.
|
||||
* 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)
|
||||
|
|
@ -867,7 +841,7 @@ static int __init hvc_iucv_alloc(int id)
|
|||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Finally allocate hvc */
|
||||
/* 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)) {
|
||||
|
|
@ -877,7 +851,7 @@ static int __init hvc_iucv_alloc(int id)
|
|||
return rc;
|
||||
}
|
||||
|
||||
/* kick khvcd thread; instead of using polling */
|
||||
/* notify HVC thread instead of using polling */
|
||||
priv->hvc->irq_requested = 1;
|
||||
|
||||
/* setup iucv related information */
|
||||
|
|
@ -890,7 +864,7 @@ 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)
|
||||
{
|
||||
|
|
@ -929,7 +903,7 @@ static int __init hvc_iucv_init(void)
|
|||
rc = hvc_iucv_alloc(i);
|
||||
if (rc) {
|
||||
pr_err("Creating a new HVC terminal device "
|
||||
"failed with error code=%d\n", rc);
|
||||
"failed with error code=%d\n", rc);
|
||||
goto out_error_hvc;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue