forked from Minki/linux
e35e1fadb4
Under load the following bug message appeared while using sysrq-t: BUG: scheduling while atomic: bash/3662/0x00000004 0000000000105b74 000000003ba17740 0000000000000002 0000000000000000 000000003ba177e0 000000003ba17758 000000003ba17758 0000000000105bfe 0000000000817ba8 000000003f2a5350 0000000000000000 0000000000000000 000000003ba17740 000000000000000c 000000003ba17740 000000003ba177b0 0000000000568630 0000000000105bfe 000000003ba17740 000000003ba17790 Call Trace: ([<0000000000105b74>] show_trace+0x13c/0x158) [<0000000000105c58>] show_stack+0xc8/0xfc [<0000000000105cbc>] dump_stack+0x30/0x40 [<000000000012a0c8>] __schedule_bug+0x84/0x94 [<000000000056234e>] schedule+0x5ea/0x970 [<0000000000477cd2>] __sclp_vt220_write+0x1f6/0x3ec [<0000000000477f00>] sclp_vt220_con_write+0x38/0x48 [<0000000000130b4a>] __call_console_drivers+0xbe/0xd8 [<0000000000130bf0>] _call_console_drivers+0x8c/0xd0 [<0000000000130eea>] release_console_sem+0x1a6/0x2fc [<0000000000131786>] vprintk+0x262/0x480 [<00000000001319fa>] printk+0x56/0x68 [<0000000000125aaa>] print_cfs_rq+0x45e/0x4a4 [<000000000012614e>] sched_debug_show+0x65e/0xee8 [<000000000012a8fc>] show_state_filter+0x1cc/0x1f0 [<000000000044d39c>] sysrq_handle_showstate+0x2c/0x3c [<000000000044d1fe>] __handle_sysrq+0xae/0x18c [<00000000002001f2>] write_sysrq_trigger+0x8a/0x90 [<00000000001f7862>] proc_reg_write+0x9a/0xc4 [<00000000001a83d4>] vfs_write+0xb8/0x174 [<00000000001a8b88>] sys_write+0x58/0x8c [<0000000000112e7c>] sysc_noemu+0x10/0x16 [<0000020000116f68>] 0x20000116f68 The problem seems to be, that with a full console buffer, release_console_sem disables interrupts with spin_lock_irqsave and then calls the console function without enabling interrupts. __sclp_vt220_write checks for in_interrupt, to decide if it can schedule. It should check for in_atomic instead. The same is true for sclp_tty.c. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
805 lines
21 KiB
C
805 lines
21 KiB
C
/*
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* drivers/s390/char/sclp_tty.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 (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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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/wait.h>
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#include <linux/slab.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 <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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#define SCLP_TTY_PRINT_HEADER "sclp tty driver: "
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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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/* Waitqueue to wait for buffers to get empty. */
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static wait_queue_head_t sclp_tty_waitq;
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static struct tty_struct *sclp_tty;
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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 struct sclp_ioctls sclp_ioctls;
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static struct sclp_ioctls sclp_ioctls_init =
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{
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8, /* 1 hor. tab. = 8 spaces */
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0, /* no echo of input by this driver */
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80, /* 80 characters/line */
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1, /* write after 1/10 s without final new line */
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MAX_KMEM_PAGES, /* quick fix: avoid __alloc_pages */
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MAX_KMEM_PAGES, /* take 32/64 pages from kernel memory, */
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0, /* do not convert to lower case */
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0x6c /* to seprate upper and lower case */
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/* ('%' in EBCDIC) */
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};
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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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sclp_tty = tty;
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tty->driver_data = NULL;
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tty->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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sclp_tty = NULL;
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}
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/* execute commands to control the i/o behaviour of the SCLP tty at runtime */
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static int
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sclp_tty_ioctl(struct tty_struct *tty, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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unsigned long flags;
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unsigned int obuf;
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int check;
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int rc;
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if (tty->flags & (1 << TTY_IO_ERROR))
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return -EIO;
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rc = 0;
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check = 0;
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switch (cmd) {
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case TIOCSCLPSHTAB:
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/* set width of horizontal tab */
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if (get_user(sclp_ioctls.htab, (unsigned short __user *) arg))
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rc = -EFAULT;
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else
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check = 1;
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break;
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case TIOCSCLPGHTAB:
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/* get width of horizontal tab */
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if (put_user(sclp_ioctls.htab, (unsigned short __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSECHO:
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/* enable/disable echo of input */
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if (get_user(sclp_ioctls.echo, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPGECHO:
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/* Is echo of input enabled ? */
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if (put_user(sclp_ioctls.echo, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSCOLS:
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/* set number of columns for output */
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if (get_user(sclp_ioctls.columns, (unsigned short __user *) arg))
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rc = -EFAULT;
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else
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check = 1;
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break;
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case TIOCSCLPGCOLS:
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/* get number of columns for output */
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if (put_user(sclp_ioctls.columns, (unsigned short __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSNL:
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/* enable/disable writing without final new line character */
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if (get_user(sclp_ioctls.final_nl, (signed char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPGNL:
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/* Is writing without final new line character enabled ? */
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if (put_user(sclp_ioctls.final_nl, (signed char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSOBUF:
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/*
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* set the maximum buffers size for output, will be rounded
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* up to next 4kB boundary and stored as number of SCCBs
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* (4kB Buffers) limitation: 256 x 4kB
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*/
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if (get_user(obuf, (unsigned int __user *) arg) == 0) {
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if (obuf & 0xFFF)
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sclp_ioctls.max_sccb = (obuf >> 12) + 1;
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else
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sclp_ioctls.max_sccb = (obuf >> 12);
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} else
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rc = -EFAULT;
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break;
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case TIOCSCLPGOBUF:
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/* get the maximum buffers size for output */
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obuf = sclp_ioctls.max_sccb << 12;
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if (put_user(obuf, (unsigned int __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPGKBUF:
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/* get the number of buffers got from kernel at startup */
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if (put_user(sclp_ioctls.kmem_sccb, (unsigned short __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSCASE:
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/* enable/disable conversion from upper to lower case */
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if (get_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPGCASE:
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/* Is conversion from upper to lower case of input enabled? */
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if (put_user(sclp_ioctls.tolower, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSDELIM:
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/*
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* set special character used for separating upper and
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* lower case, 0x00 disables this feature
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*/
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if (get_user(sclp_ioctls.delim, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPGDELIM:
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/*
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* get special character used for separating upper and
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* lower case, 0x00 disables this feature
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*/
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if (put_user(sclp_ioctls.delim, (unsigned char __user *) arg))
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rc = -EFAULT;
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break;
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case TIOCSCLPSINIT:
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/* set initial (default) sclp ioctls */
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sclp_ioctls = sclp_ioctls_init;
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check = 1;
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break;
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default:
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rc = -ENOIOCTLCMD;
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break;
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}
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if (check) {
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spin_lock_irqsave(&sclp_tty_lock, flags);
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if (sclp_ttybuf != NULL) {
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sclp_set_htab(sclp_ttybuf, sclp_ioctls.htab);
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sclp_set_columns(sclp_ttybuf, sclp_ioctls.columns);
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}
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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}
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return rc;
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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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wake_up(&sclp_tty_waitq);
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/* check if the tty needs a wake up call */
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if (sclp_tty != NULL) {
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tty_wakeup(sclp_tty);
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}
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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 void
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sclp_tty_write_string(const unsigned char *str, int count)
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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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struct sclp_buffer *buf;
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if (count <= 0)
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return;
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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 (in_atomic())
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sclp_sync_wait();
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else
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wait_event(sclp_tty_waitq,
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!list_empty(&sclp_tty_pages));
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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,
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sclp_ioctls.columns,
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sclp_ioctls.htab);
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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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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_ioctls.final_nl) {
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if (sclp_ttybuf != NULL &&
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sclp_chars_in_buffer(sclp_ttybuf) != 0 &&
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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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} else {
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if (sclp_ttybuf != NULL &&
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sclp_chars_in_buffer(sclp_ttybuf) != 0) {
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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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}
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}
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spin_unlock_irqrestore(&sclp_tty_lock, flags);
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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);
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sclp_tty_chars_count = 0;
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}
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sclp_tty_write_string(buf, count);
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return count;
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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 void
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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);
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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 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);
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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
|
|
* SCLP driver. The provided number includes all characters that are stored
|
|
* in the SCCB (will be written next time the SCLP is not busy) as well as
|
|
* characters in the write buffer (will not be written as long as there is a
|
|
* final line feed missing).
|
|
*/
|
|
static int
|
|
sclp_tty_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
unsigned long flags;
|
|
struct list_head *l;
|
|
struct sclp_buffer *t;
|
|
int count;
|
|
|
|
spin_lock_irqsave(&sclp_tty_lock, flags);
|
|
count = 0;
|
|
if (sclp_ttybuf != NULL)
|
|
count = sclp_chars_in_buffer(sclp_ttybuf);
|
|
list_for_each(l, &sclp_tty_outqueue) {
|
|
t = list_entry(l, struct sclp_buffer, list);
|
|
count += sclp_chars_in_buffer(t);
|
|
}
|
|
spin_unlock_irqrestore(&sclp_tty_lock, flags);
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* removes all content from buffers of low level driver
|
|
*/
|
|
static void
|
|
sclp_tty_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
if (sclp_tty_chars_count > 0) {
|
|
sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count);
|
|
sclp_tty_chars_count = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* push input to tty
|
|
*/
|
|
static void
|
|
sclp_tty_input(unsigned char* buf, unsigned int count)
|
|
{
|
|
unsigned int cchar;
|
|
|
|
/*
|
|
* If this tty driver is currently closed
|
|
* then throw the received input away.
|
|
*/
|
|
if (sclp_tty == NULL)
|
|
return;
|
|
cchar = ctrlchar_handle(buf, count, sclp_tty);
|
|
switch (cchar & CTRLCHAR_MASK) {
|
|
case CTRLCHAR_SYSRQ:
|
|
break;
|
|
case CTRLCHAR_CTRL:
|
|
tty_insert_flip_char(sclp_tty, cchar, TTY_NORMAL);
|
|
tty_flip_buffer_push(sclp_tty);
|
|
break;
|
|
case CTRLCHAR_NONE:
|
|
/* send (normal) input to line discipline */
|
|
if (count < 2 ||
|
|
(strncmp((const char *) buf + count - 2, "^n", 2) &&
|
|
strncmp((const char *) buf + count - 2, "\252n", 2))) {
|
|
/* add the auto \n */
|
|
tty_insert_flip_string(sclp_tty, buf, count);
|
|
tty_insert_flip_char(sclp_tty, '\n', TTY_NORMAL);
|
|
} else
|
|
tty_insert_flip_string(sclp_tty, buf, count - 2);
|
|
tty_flip_buffer_push(sclp_tty);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* get a EBCDIC string in upper/lower case,
|
|
* find out characters in lower/upper case separated by a special character,
|
|
* modifiy original string,
|
|
* returns length of resulting string
|
|
*/
|
|
static int
|
|
sclp_switch_cases(unsigned char *buf, int count,
|
|
unsigned char delim, int tolower)
|
|
{
|
|
unsigned char *ip, *op;
|
|
int toggle;
|
|
|
|
/* initially changing case is off */
|
|
toggle = 0;
|
|
ip = op = buf;
|
|
while (count-- > 0) {
|
|
/* compare with special character */
|
|
if (*ip == delim) {
|
|
/* followed by another special character? */
|
|
if (count && ip[1] == delim) {
|
|
/*
|
|
* ... then put a single copy of the special
|
|
* character to the output string
|
|
*/
|
|
*op++ = *ip++;
|
|
count--;
|
|
} else
|
|
/*
|
|
* ... special character follower by a normal
|
|
* character toggles the case change behaviour
|
|
*/
|
|
toggle = ~toggle;
|
|
/* skip special character */
|
|
ip++;
|
|
} else
|
|
/* not the special character */
|
|
if (toggle)
|
|
/* but case switching is on */
|
|
if (tolower)
|
|
/* switch to uppercase */
|
|
*op++ = _ebc_toupper[(int) *ip++];
|
|
else
|
|
/* switch to lowercase */
|
|
*op++ = _ebc_tolower[(int) *ip++];
|
|
else
|
|
/* no case switching, copy the character */
|
|
*op++ = *ip++;
|
|
}
|
|
/* return length of reformatted string. */
|
|
return op - buf;
|
|
}
|
|
|
|
static void
|
|
sclp_get_input(unsigned char *start, unsigned char *end)
|
|
{
|
|
int count;
|
|
|
|
count = end - start;
|
|
/*
|
|
* if set in ioctl convert EBCDIC to lower case
|
|
* (modify original input in SCCB)
|
|
*/
|
|
if (sclp_ioctls.tolower)
|
|
EBC_TOLOWER(start, count);
|
|
|
|
/*
|
|
* if set in ioctl find out characters in lower or upper case
|
|
* (depends on current case) separated by a special character,
|
|
* works on EBCDIC
|
|
*/
|
|
if (sclp_ioctls.delim)
|
|
count = sclp_switch_cases(start, count,
|
|
sclp_ioctls.delim,
|
|
sclp_ioctls.tolower);
|
|
|
|
/* convert EBCDIC to ASCII (modify original input in SCCB) */
|
|
sclp_ebcasc_str(start, count);
|
|
|
|
/* if set in ioctl write operators input to console */
|
|
if (sclp_ioctls.echo)
|
|
sclp_tty_write(sclp_tty, start, count);
|
|
|
|
/* transfer input to high level driver */
|
|
sclp_tty_input(start, count);
|
|
}
|
|
|
|
static inline struct gds_vector *
|
|
find_gds_vector(struct gds_vector *start, struct gds_vector *end, u16 id)
|
|
{
|
|
struct gds_vector *vec;
|
|
|
|
for (vec = start; vec < end; vec = (void *) vec + vec->length)
|
|
if (vec->gds_id == id)
|
|
return vec;
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct gds_subvector *
|
|
find_gds_subvector(struct gds_subvector *start,
|
|
struct gds_subvector *end, u8 key)
|
|
{
|
|
struct gds_subvector *subvec;
|
|
|
|
for (subvec = start; subvec < end;
|
|
subvec = (void *) subvec + subvec->length)
|
|
if (subvec->key == key)
|
|
return subvec;
|
|
return NULL;
|
|
}
|
|
|
|
static inline void
|
|
sclp_eval_selfdeftextmsg(struct gds_subvector *start,
|
|
struct gds_subvector *end)
|
|
{
|
|
struct gds_subvector *subvec;
|
|
|
|
subvec = start;
|
|
while (subvec < end) {
|
|
subvec = find_gds_subvector(subvec, end, 0x30);
|
|
if (!subvec)
|
|
break;
|
|
sclp_get_input((unsigned char *)(subvec + 1),
|
|
(unsigned char *) subvec + subvec->length);
|
|
subvec = (void *) subvec + subvec->length;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
sclp_eval_textcmd(struct gds_subvector *start,
|
|
struct gds_subvector *end)
|
|
{
|
|
struct gds_subvector *subvec;
|
|
|
|
subvec = start;
|
|
while (subvec < end) {
|
|
subvec = find_gds_subvector(subvec, end,
|
|
GDS_KEY_SELFDEFTEXTMSG);
|
|
if (!subvec)
|
|
break;
|
|
sclp_eval_selfdeftextmsg((struct gds_subvector *)(subvec + 1),
|
|
(void *)subvec + subvec->length);
|
|
subvec = (void *) subvec + subvec->length;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
sclp_eval_cpmsu(struct gds_vector *start, struct gds_vector *end)
|
|
{
|
|
struct gds_vector *vec;
|
|
|
|
vec = start;
|
|
while (vec < end) {
|
|
vec = find_gds_vector(vec, end, GDS_ID_TEXTCMD);
|
|
if (!vec)
|
|
break;
|
|
sclp_eval_textcmd((struct gds_subvector *)(vec + 1),
|
|
(void *) vec + vec->length);
|
|
vec = (void *) vec + vec->length;
|
|
}
|
|
}
|
|
|
|
|
|
static inline void
|
|
sclp_eval_mdsmu(struct gds_vector *start, void *end)
|
|
{
|
|
struct gds_vector *vec;
|
|
|
|
vec = find_gds_vector(start, end, GDS_ID_CPMSU);
|
|
if (vec)
|
|
sclp_eval_cpmsu(vec + 1, (void *) vec + vec->length);
|
|
}
|
|
|
|
static void
|
|
sclp_tty_receiver(struct evbuf_header *evbuf)
|
|
{
|
|
struct gds_vector *start, *end, *vec;
|
|
|
|
start = (struct gds_vector *)(evbuf + 1);
|
|
end = (void *) evbuf + evbuf->length;
|
|
vec = find_gds_vector(start, end, GDS_ID_MDSMU);
|
|
if (vec)
|
|
sclp_eval_mdsmu(vec + 1, (void *) vec + vec->length);
|
|
}
|
|
|
|
static void
|
|
sclp_tty_state_change(struct sclp_register *reg)
|
|
{
|
|
}
|
|
|
|
static struct sclp_register sclp_input_event =
|
|
{
|
|
.receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK,
|
|
.state_change_fn = sclp_tty_state_change,
|
|
.receiver_fn = sclp_tty_receiver
|
|
};
|
|
|
|
static const struct tty_operations sclp_ops = {
|
|
.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,
|
|
.ioctl = sclp_tty_ioctl,
|
|
};
|
|
|
|
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) {
|
|
printk(KERN_ERR SCLP_TTY_PRINT_HEADER
|
|
"could not register tty - "
|
|
"sclp_rw_init returned %d\n", 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_waitqueue_head(&sclp_tty_waitq);
|
|
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_ioctls_init.columns = 76;
|
|
/* case input lines to lowercase */
|
|
sclp_ioctls_init.tolower = 1;
|
|
}
|
|
sclp_ioctls = sclp_ioctls_init;
|
|
sclp_tty_chars_count = 0;
|
|
sclp_tty = NULL;
|
|
|
|
rc = sclp_register(&sclp_input_event);
|
|
if (rc) {
|
|
put_tty_driver(driver);
|
|
return rc;
|
|
}
|
|
|
|
driver->owner = THIS_MODULE;
|
|
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);
|
|
rc = tty_register_driver(driver);
|
|
if (rc) {
|
|
printk(KERN_ERR SCLP_TTY_PRINT_HEADER
|
|
"could not register tty - "
|
|
"tty_register_driver returned %d\n", rc);
|
|
put_tty_driver(driver);
|
|
return rc;
|
|
}
|
|
sclp_tty_driver = driver;
|
|
return 0;
|
|
}
|
|
module_init(sclp_tty_init);
|