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https://github.com/edk2-porting/linux-next.git
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6aad04f213
It allows for cleaning up on a considerable amount of places. They did port_get, wakeup, kref_put. Now the only thing needed is to call tty_port_tty_wakeup which does exactly that. One exception is ifx6x60 where tty_wakeup was open-coded. We now call tty_wakeup properly there. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
577 lines
15 KiB
C
577 lines
15 KiB
C
/*
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* SCLP line mode terminal driver.
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*
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* S390 version
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* Copyright IBM Corp. 1999
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* Author(s): Martin Peschke <mpeschke@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/kmod.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/gfp.h>
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#include <asm/uaccess.h>
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#include "ctrlchar.h"
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#include "sclp.h"
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#include "sclp_rw.h"
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#include "sclp_tty.h"
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/*
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* size of a buffer that collects single characters coming in
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* via sclp_tty_put_char()
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*/
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#define SCLP_TTY_BUF_SIZE 512
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/*
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* There is exactly one SCLP terminal, so we can keep things simple
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* and allocate all variables statically.
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*/
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/* Lock to guard over changes to global variables. */
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static spinlock_t sclp_tty_lock;
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/* List of free pages that can be used for console output buffering. */
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static struct list_head sclp_tty_pages;
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/* List of full struct sclp_buffer structures ready for output. */
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static struct list_head sclp_tty_outqueue;
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/* Counter how many buffers are emitted. */
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static int sclp_tty_buffer_count;
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/* Pointer to current console buffer. */
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static struct sclp_buffer *sclp_ttybuf;
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/* Timer for delayed output of console messages. */
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static struct timer_list sclp_tty_timer;
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static struct tty_port sclp_port;
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static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE];
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static unsigned short int sclp_tty_chars_count;
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struct tty_driver *sclp_tty_driver;
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static int sclp_tty_tolower;
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static int sclp_tty_columns = 80;
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#define SPACES_PER_TAB 8
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#define CASE_DELIMITER 0x6c /* to separate upper and lower case (% in EBCDIC) */
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/* This routine is called whenever we try to open a SCLP terminal. */
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static int
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sclp_tty_open(struct tty_struct *tty, struct file *filp)
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{
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tty_port_tty_set(&sclp_port, tty);
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tty->driver_data = NULL;
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sclp_port.low_latency = 0;
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return 0;
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}
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/* This routine is called when the SCLP terminal is closed. */
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static void
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sclp_tty_close(struct tty_struct *tty, struct file *filp)
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{
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if (tty->count > 1)
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return;
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tty_port_tty_set(&sclp_port, NULL);
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}
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/*
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* This routine returns the numbers of characters the tty driver
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* will accept for queuing to be written. This number is subject
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* to change as output buffers get emptied, or if the output flow
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* control is acted. This is not an exact number because not every
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* character needs the same space in the sccb. The worst case is
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* a string of newlines. Every newlines creates a new mto which
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* needs 8 bytes.
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*/
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static int
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sclp_tty_write_room (struct tty_struct *tty)
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{
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unsigned long flags;
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struct list_head *l;
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int count;
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spin_lock_irqsave(&sclp_tty_lock, flags);
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count = 0;
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if (sclp_ttybuf != NULL)
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count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct mto);
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list_for_each(l, &sclp_tty_pages)
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count += NR_EMPTY_MTO_PER_SCCB;
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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return count;
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}
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static void
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sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc)
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{
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unsigned long flags;
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void *page;
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do {
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page = sclp_unmake_buffer(buffer);
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spin_lock_irqsave(&sclp_tty_lock, flags);
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/* Remove buffer from outqueue */
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list_del(&buffer->list);
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sclp_tty_buffer_count--;
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list_add_tail((struct list_head *) page, &sclp_tty_pages);
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/* Check if there is a pending buffer on the out queue. */
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buffer = NULL;
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if (!list_empty(&sclp_tty_outqueue))
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buffer = list_entry(sclp_tty_outqueue.next,
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struct sclp_buffer, list);
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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} while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback));
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tty_port_tty_wakeup(&sclp_port);
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}
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static inline void
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__sclp_ttybuf_emit(struct sclp_buffer *buffer)
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{
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unsigned long flags;
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int count;
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int rc;
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spin_lock_irqsave(&sclp_tty_lock, flags);
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list_add_tail(&buffer->list, &sclp_tty_outqueue);
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count = sclp_tty_buffer_count++;
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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if (count)
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return;
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rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback);
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if (rc)
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sclp_ttybuf_callback(buffer, rc);
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}
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/*
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* When this routine is called from the timer then we flush the
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* temporary write buffer.
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*/
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static void
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sclp_tty_timeout(unsigned long data)
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{
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unsigned long flags;
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struct sclp_buffer *buf;
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spin_lock_irqsave(&sclp_tty_lock, flags);
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buf = sclp_ttybuf;
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sclp_ttybuf = NULL;
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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if (buf != NULL) {
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__sclp_ttybuf_emit(buf);
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}
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}
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/*
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* Write a string to the sclp tty.
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*/
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static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail)
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{
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unsigned long flags;
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void *page;
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int written;
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int overall_written;
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struct sclp_buffer *buf;
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if (count <= 0)
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return 0;
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overall_written = 0;
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spin_lock_irqsave(&sclp_tty_lock, flags);
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do {
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/* Create a sclp output buffer if none exists yet */
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if (sclp_ttybuf == NULL) {
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while (list_empty(&sclp_tty_pages)) {
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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if (may_fail)
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goto out;
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else
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sclp_sync_wait();
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spin_lock_irqsave(&sclp_tty_lock, flags);
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}
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page = sclp_tty_pages.next;
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list_del((struct list_head *) page);
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sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns,
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SPACES_PER_TAB);
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}
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/* try to write the string to the current output buffer */
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written = sclp_write(sclp_ttybuf, str, count);
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overall_written += written;
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if (written == count)
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break;
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/*
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* Not all characters could be written to the current
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* output buffer. Emit the buffer, create a new buffer
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* and then output the rest of the string.
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*/
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buf = sclp_ttybuf;
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sclp_ttybuf = NULL;
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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__sclp_ttybuf_emit(buf);
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spin_lock_irqsave(&sclp_tty_lock, flags);
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str += written;
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count -= written;
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} while (count > 0);
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/* Setup timer to output current console buffer after 1/10 second */
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if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) &&
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!timer_pending(&sclp_tty_timer)) {
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init_timer(&sclp_tty_timer);
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sclp_tty_timer.function = sclp_tty_timeout;
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sclp_tty_timer.data = 0UL;
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sclp_tty_timer.expires = jiffies + HZ/10;
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add_timer(&sclp_tty_timer);
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}
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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out:
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return overall_written;
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}
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/*
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* This routine is called by the kernel to write a series of characters to the
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* tty device. The characters may come from user space or kernel space. This
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* routine will return the number of characters actually accepted for writing.
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*/
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static int
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sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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if (sclp_tty_chars_count > 0) {
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sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
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sclp_tty_chars_count = 0;
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}
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return sclp_tty_write_string(buf, count, 1);
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}
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/*
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* This routine is called by the kernel to write a single character to the tty
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* device. If the kernel uses this routine, it must call the flush_chars()
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* routine (if defined) when it is done stuffing characters into the driver.
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*
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* Characters provided to sclp_tty_put_char() are buffered by the SCLP driver.
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* If the given character is a '\n' the contents of the SCLP write buffer
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* - including previous characters from sclp_tty_put_char() and strings from
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* sclp_write() without final '\n' - will be written.
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*/
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static int
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sclp_tty_put_char(struct tty_struct *tty, unsigned char ch)
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{
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sclp_tty_chars[sclp_tty_chars_count++] = ch;
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if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) {
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sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
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sclp_tty_chars_count = 0;
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}
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return 1;
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}
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/*
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* This routine is called by the kernel after it has written a series of
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* characters to the tty device using put_char().
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*/
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static void
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sclp_tty_flush_chars(struct tty_struct *tty)
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{
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if (sclp_tty_chars_count > 0) {
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sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
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sclp_tty_chars_count = 0;
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}
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}
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/*
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* This routine returns the number of characters in the write buffer of the
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* SCLP driver. The provided number includes all characters that are stored
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* in the SCCB (will be written next time the SCLP is not busy) as well as
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* characters in the write buffer (will not be written as long as there is a
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* final line feed missing).
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*/
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static int
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sclp_tty_chars_in_buffer(struct tty_struct *tty)
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{
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unsigned long flags;
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struct list_head *l;
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struct sclp_buffer *t;
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int count;
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spin_lock_irqsave(&sclp_tty_lock, flags);
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count = 0;
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if (sclp_ttybuf != NULL)
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count = sclp_chars_in_buffer(sclp_ttybuf);
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list_for_each(l, &sclp_tty_outqueue) {
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t = list_entry(l, struct sclp_buffer, list);
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count += sclp_chars_in_buffer(t);
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}
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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return count;
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}
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/*
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* removes all content from buffers of low level driver
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*/
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static void
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sclp_tty_flush_buffer(struct tty_struct *tty)
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{
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if (sclp_tty_chars_count > 0) {
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sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
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sclp_tty_chars_count = 0;
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}
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}
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/*
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* push input to tty
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*/
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static void
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sclp_tty_input(unsigned char* buf, unsigned int count)
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{
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struct tty_struct *tty = tty_port_tty_get(&sclp_port);
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unsigned int cchar;
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/*
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* If this tty driver is currently closed
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* then throw the received input away.
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*/
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if (tty == NULL)
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return;
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cchar = ctrlchar_handle(buf, count, tty);
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switch (cchar & CTRLCHAR_MASK) {
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case CTRLCHAR_SYSRQ:
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break;
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case CTRLCHAR_CTRL:
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tty_insert_flip_char(&sclp_port, cchar, TTY_NORMAL);
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tty_flip_buffer_push(&sclp_port);
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break;
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case CTRLCHAR_NONE:
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/* send (normal) input to line discipline */
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if (count < 2 ||
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(strncmp((const char *) buf + count - 2, "^n", 2) &&
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strncmp((const char *) buf + count - 2, "\252n", 2))) {
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/* add the auto \n */
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tty_insert_flip_string(&sclp_port, buf, count);
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tty_insert_flip_char(&sclp_port, '\n', TTY_NORMAL);
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} else
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tty_insert_flip_string(&sclp_port, buf, count - 2);
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tty_flip_buffer_push(&sclp_port);
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break;
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}
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tty_kref_put(tty);
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}
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/*
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* get a EBCDIC string in upper/lower case,
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* find out characters in lower/upper case separated by a special character,
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* modifiy original string,
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* returns length of resulting string
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*/
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static int sclp_switch_cases(unsigned char *buf, int count)
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{
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unsigned char *ip, *op;
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int toggle;
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/* initially changing case is off */
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toggle = 0;
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ip = op = buf;
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while (count-- > 0) {
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/* compare with special character */
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if (*ip == CASE_DELIMITER) {
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/* followed by another special character? */
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if (count && ip[1] == CASE_DELIMITER) {
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/*
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* ... then put a single copy of the special
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* character to the output string
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*/
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*op++ = *ip++;
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count--;
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} else
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/*
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* ... special character follower by a normal
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* character toggles the case change behaviour
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*/
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toggle = ~toggle;
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/* skip special character */
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ip++;
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} else
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/* not the special character */
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if (toggle)
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/* but case switching is on */
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if (sclp_tty_tolower)
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/* switch to uppercase */
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*op++ = _ebc_toupper[(int) *ip++];
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else
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/* switch to lowercase */
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*op++ = _ebc_tolower[(int) *ip++];
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else
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/* no case switching, copy the character */
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*op++ = *ip++;
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}
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/* return length of reformatted string. */
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return op - buf;
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}
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static void sclp_get_input(struct gds_subvector *sv)
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{
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unsigned char *str;
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int count;
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str = (unsigned char *) (sv + 1);
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count = sv->length - sizeof(*sv);
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if (sclp_tty_tolower)
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EBC_TOLOWER(str, count);
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count = sclp_switch_cases(str, count);
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/* convert EBCDIC to ASCII (modify original input in SCCB) */
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sclp_ebcasc_str(str, count);
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/* transfer input to high level driver */
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sclp_tty_input(str, count);
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}
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static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv)
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{
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void *end;
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end = (void *) sv + sv->length;
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for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length)
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if (sv->key == 0x30)
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sclp_get_input(sv);
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}
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static inline void sclp_eval_textcmd(struct gds_vector *v)
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{
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struct gds_subvector *sv;
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void *end;
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end = (void *) v + v->length;
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for (sv = (struct gds_subvector *) (v + 1);
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(void *) sv < end; sv = (void *) sv + sv->length)
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if (sv->key == GDS_KEY_SELFDEFTEXTMSG)
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sclp_eval_selfdeftextmsg(sv);
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}
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static inline void sclp_eval_cpmsu(struct gds_vector *v)
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{
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void *end;
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end = (void *) v + v->length;
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for (v = v + 1; (void *) v < end; v = (void *) v + v->length)
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if (v->gds_id == GDS_ID_TEXTCMD)
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sclp_eval_textcmd(v);
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}
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static inline void sclp_eval_mdsmu(struct gds_vector *v)
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{
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v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU);
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if (v)
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sclp_eval_cpmsu(v);
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}
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static void sclp_tty_receiver(struct evbuf_header *evbuf)
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{
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struct gds_vector *v;
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v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
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GDS_ID_MDSMU);
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if (v)
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sclp_eval_mdsmu(v);
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}
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static void
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sclp_tty_state_change(struct sclp_register *reg)
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{
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}
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static struct sclp_register sclp_input_event =
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{
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.receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
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.state_change_fn = sclp_tty_state_change,
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.receiver_fn = sclp_tty_receiver
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};
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static const struct tty_operations sclp_ops = {
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.open = sclp_tty_open,
|
|
.close = sclp_tty_close,
|
|
.write = sclp_tty_write,
|
|
.put_char = sclp_tty_put_char,
|
|
.flush_chars = sclp_tty_flush_chars,
|
|
.write_room = sclp_tty_write_room,
|
|
.chars_in_buffer = sclp_tty_chars_in_buffer,
|
|
.flush_buffer = sclp_tty_flush_buffer,
|
|
};
|
|
|
|
static int __init
|
|
sclp_tty_init(void)
|
|
{
|
|
struct tty_driver *driver;
|
|
void *page;
|
|
int i;
|
|
int rc;
|
|
|
|
if (!CONSOLE_IS_SCLP)
|
|
return 0;
|
|
driver = alloc_tty_driver(1);
|
|
if (!driver)
|
|
return -ENOMEM;
|
|
|
|
rc = sclp_rw_init();
|
|
if (rc) {
|
|
put_tty_driver(driver);
|
|
return rc;
|
|
}
|
|
/* Allocate pages for output buffering */
|
|
INIT_LIST_HEAD(&sclp_tty_pages);
|
|
for (i = 0; i < MAX_KMEM_PAGES; i++) {
|
|
page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (page == NULL) {
|
|
put_tty_driver(driver);
|
|
return -ENOMEM;
|
|
}
|
|
list_add_tail((struct list_head *) page, &sclp_tty_pages);
|
|
}
|
|
INIT_LIST_HEAD(&sclp_tty_outqueue);
|
|
spin_lock_init(&sclp_tty_lock);
|
|
init_timer(&sclp_tty_timer);
|
|
sclp_ttybuf = NULL;
|
|
sclp_tty_buffer_count = 0;
|
|
if (MACHINE_IS_VM) {
|
|
/*
|
|
* save 4 characters for the CPU number
|
|
* written at start of each line by VM/CP
|
|
*/
|
|
sclp_tty_columns = 76;
|
|
/* case input lines to lowercase */
|
|
sclp_tty_tolower = 1;
|
|
}
|
|
sclp_tty_chars_count = 0;
|
|
|
|
rc = sclp_register(&sclp_input_event);
|
|
if (rc) {
|
|
put_tty_driver(driver);
|
|
return rc;
|
|
}
|
|
|
|
tty_port_init(&sclp_port);
|
|
|
|
driver->driver_name = "sclp_line";
|
|
driver->name = "sclp_line";
|
|
driver->major = TTY_MAJOR;
|
|
driver->minor_start = 64;
|
|
driver->type = TTY_DRIVER_TYPE_SYSTEM;
|
|
driver->subtype = SYSTEM_TYPE_TTY;
|
|
driver->init_termios = tty_std_termios;
|
|
driver->init_termios.c_iflag = IGNBRK | IGNPAR;
|
|
driver->init_termios.c_oflag = ONLCR | XTABS;
|
|
driver->init_termios.c_lflag = ISIG | ECHO;
|
|
driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(driver, &sclp_ops);
|
|
tty_port_link_device(&sclp_port, driver, 0);
|
|
rc = tty_register_driver(driver);
|
|
if (rc) {
|
|
put_tty_driver(driver);
|
|
tty_port_destroy(&sclp_port);
|
|
return rc;
|
|
}
|
|
sclp_tty_driver = driver;
|
|
return 0;
|
|
}
|
|
module_init(sclp_tty_init);
|