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c9602ee7d1
In preparation for unconditionally passing the struct timer_list pointer to all timer callbacks, switch to using the new timer_setup() and from_timer() to pass the timer pointer explicitly. Instead of creating an external static data variable, just define a separate callback which encodes the "force restart" desire. Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kees Cook <keescook@chromium.org> [heiko.carstens@de.ibm.com: get rid of compile warning] Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
650 lines
16 KiB
C
650 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IBM/3270 Driver - console view.
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*
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* Author(s):
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* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
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* Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Copyright IBM Corp. 2003, 2009
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*/
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/reboot.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/cpcmd.h>
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#include <asm/ebcdic.h>
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#include "raw3270.h"
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#include "tty3270.h"
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#include "ctrlchar.h"
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#define CON3270_OUTPUT_BUFFER_SIZE 1024
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#define CON3270_STRING_PAGES 4
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static struct raw3270_fn con3270_fn;
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static bool auto_update = true;
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module_param(auto_update, bool, 0);
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/*
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* Main 3270 console view data structure.
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*/
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struct con3270 {
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struct raw3270_view view;
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struct list_head freemem; /* list of free memory for strings. */
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/* Output stuff. */
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struct list_head lines; /* list of lines. */
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struct list_head update; /* list of lines to update. */
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int line_nr; /* line number for next update. */
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int nr_lines; /* # lines in list. */
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int nr_up; /* # lines up in history. */
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unsigned long update_flags; /* Update indication bits. */
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struct string *cline; /* current output line. */
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struct string *status; /* last line of display. */
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struct raw3270_request *write; /* single write request. */
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struct timer_list timer;
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/* Input stuff. */
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struct string *input; /* input string for read request. */
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struct raw3270_request *read; /* single read request. */
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struct raw3270_request *kreset; /* single keyboard reset request. */
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struct tasklet_struct readlet; /* tasklet to issue read request. */
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};
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static struct con3270 *condev;
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/* con3270->update_flags. See con3270_update for details. */
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#define CON_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */
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#define CON_UPDATE_LIST 2 /* Update lines in tty3270->update. */
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#define CON_UPDATE_STATUS 4 /* Update status line. */
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#define CON_UPDATE_ALL 8 /* Recreate screen. */
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static void con3270_update(struct timer_list *);
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/*
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* Setup timeout for a device. On timeout trigger an update.
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*/
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static void con3270_set_timer(struct con3270 *cp, int expires)
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{
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if (expires == 0)
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del_timer(&cp->timer);
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else
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mod_timer(&cp->timer, jiffies + expires);
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}
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/*
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* The status line is the last line of the screen. It shows the string
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* "console view" in the lower left corner and "Running"/"More..."/"Holding"
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* in the lower right corner of the screen.
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*/
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static void
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con3270_update_status(struct con3270 *cp)
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{
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char *str;
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str = (cp->nr_up != 0) ? "History" : "Running";
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memcpy(cp->status->string + 24, str, 7);
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codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
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cp->update_flags |= CON_UPDATE_STATUS;
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}
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static void
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con3270_create_status(struct con3270 *cp)
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{
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static const unsigned char blueprint[] =
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{ TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
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'c','o','n','s','o','l','e',' ','v','i','e','w',
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TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
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cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
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/* Copy blueprint to status line */
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memcpy(cp->status->string, blueprint, sizeof(blueprint));
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/* Set TO_RA addresses. */
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raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
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cp->view.cols * (cp->view.rows - 1));
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raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
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cp->view.cols * cp->view.rows - 8);
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/* Convert strings to ebcdic. */
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codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
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codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
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}
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/*
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* Set output offsets to 3270 datastream fragment of a console string.
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*/
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static void
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con3270_update_string(struct con3270 *cp, struct string *s, int nr)
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{
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if (s->len < 4) {
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/* This indicates a bug, but printing a warning would
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* cause a deadlock. */
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return;
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}
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if (s->string[s->len - 4] != TO_RA)
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return;
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raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
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cp->view.cols * (nr + 1));
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}
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/*
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* Rebuild update list to print all lines.
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*/
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static void
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con3270_rebuild_update(struct con3270 *cp)
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{
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struct string *s, *n;
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int nr;
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/*
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* Throw away update list and create a new one,
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* containing all lines that will fit on the screen.
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*/
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list_for_each_entry_safe(s, n, &cp->update, update)
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list_del_init(&s->update);
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nr = cp->view.rows - 2 + cp->nr_up;
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list_for_each_entry_reverse(s, &cp->lines, list) {
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if (nr < cp->view.rows - 1)
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list_add(&s->update, &cp->update);
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if (--nr < 0)
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break;
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}
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cp->line_nr = 0;
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cp->update_flags |= CON_UPDATE_LIST;
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}
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/*
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* Alloc string for size bytes. Free strings from history if necessary.
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*/
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static struct string *
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con3270_alloc_string(struct con3270 *cp, size_t size)
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{
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struct string *s, *n;
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s = alloc_string(&cp->freemem, size);
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if (s)
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return s;
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list_for_each_entry_safe(s, n, &cp->lines, list) {
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list_del(&s->list);
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if (!list_empty(&s->update))
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list_del(&s->update);
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cp->nr_lines--;
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if (free_string(&cp->freemem, s) >= size)
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break;
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}
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s = alloc_string(&cp->freemem, size);
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BUG_ON(!s);
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if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
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cp->nr_up = cp->nr_lines - cp->view.rows + 1;
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con3270_rebuild_update(cp);
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con3270_update_status(cp);
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}
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return s;
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}
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/*
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* Write completion callback.
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*/
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static void
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con3270_write_callback(struct raw3270_request *rq, void *data)
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{
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raw3270_request_reset(rq);
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xchg(&((struct con3270 *) rq->view)->write, rq);
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}
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/*
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* Update console display.
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*/
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static void
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con3270_update(struct timer_list *t)
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{
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struct con3270 *cp = from_timer(cp, t, timer);
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struct raw3270_request *wrq;
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char wcc, prolog[6];
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unsigned long flags;
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unsigned long updated;
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struct string *s, *n;
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int rc;
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if (!auto_update && !raw3270_view_active(&cp->view))
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return;
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if (cp->view.dev)
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raw3270_activate_view(&cp->view);
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wrq = xchg(&cp->write, 0);
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if (!wrq) {
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con3270_set_timer(cp, 1);
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return;
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}
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spin_lock_irqsave(&cp->view.lock, flags);
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updated = 0;
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if (cp->update_flags & CON_UPDATE_ALL) {
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con3270_rebuild_update(cp);
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con3270_update_status(cp);
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cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
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CON_UPDATE_STATUS;
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}
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if (cp->update_flags & CON_UPDATE_ERASE) {
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/* Use erase write alternate to initialize display. */
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raw3270_request_set_cmd(wrq, TC_EWRITEA);
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updated |= CON_UPDATE_ERASE;
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} else
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raw3270_request_set_cmd(wrq, TC_WRITE);
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wcc = TW_NONE;
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raw3270_request_add_data(wrq, &wcc, 1);
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/*
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* Update status line.
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*/
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if (cp->update_flags & CON_UPDATE_STATUS)
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if (raw3270_request_add_data(wrq, cp->status->string,
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cp->status->len) == 0)
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updated |= CON_UPDATE_STATUS;
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if (cp->update_flags & CON_UPDATE_LIST) {
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prolog[0] = TO_SBA;
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prolog[3] = TO_SA;
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prolog[4] = TAT_COLOR;
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prolog[5] = TAC_TURQ;
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raw3270_buffer_address(cp->view.dev, prolog + 1,
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cp->view.cols * cp->line_nr);
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raw3270_request_add_data(wrq, prolog, 6);
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/* Write strings in the update list to the screen. */
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list_for_each_entry_safe(s, n, &cp->update, update) {
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if (s != cp->cline)
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con3270_update_string(cp, s, cp->line_nr);
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if (raw3270_request_add_data(wrq, s->string,
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s->len) != 0)
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break;
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list_del_init(&s->update);
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if (s != cp->cline)
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cp->line_nr++;
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}
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if (list_empty(&cp->update))
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updated |= CON_UPDATE_LIST;
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}
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wrq->callback = con3270_write_callback;
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rc = raw3270_start(&cp->view, wrq);
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if (rc == 0) {
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cp->update_flags &= ~updated;
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if (cp->update_flags)
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con3270_set_timer(cp, 1);
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} else {
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raw3270_request_reset(wrq);
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xchg(&cp->write, wrq);
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}
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spin_unlock_irqrestore(&cp->view.lock, flags);
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}
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/*
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* Read tasklet.
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*/
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static void
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con3270_read_tasklet(struct raw3270_request *rrq)
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{
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static char kreset_data = TW_KR;
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struct con3270 *cp;
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unsigned long flags;
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int nr_up, deactivate;
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cp = (struct con3270 *) rrq->view;
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spin_lock_irqsave(&cp->view.lock, flags);
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nr_up = cp->nr_up;
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deactivate = 0;
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/* Check aid byte. */
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switch (cp->input->string[0]) {
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case 0x7d: /* enter: jump to bottom. */
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nr_up = 0;
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break;
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case 0xf3: /* PF3: deactivate the console view. */
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deactivate = 1;
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break;
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case 0x6d: /* clear: start from scratch. */
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cp->update_flags = CON_UPDATE_ALL;
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con3270_set_timer(cp, 1);
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break;
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case 0xf7: /* PF7: do a page up in the console log. */
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nr_up += cp->view.rows - 2;
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if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
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nr_up = cp->nr_lines - cp->view.rows + 1;
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if (nr_up < 0)
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nr_up = 0;
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}
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break;
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case 0xf8: /* PF8: do a page down in the console log. */
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nr_up -= cp->view.rows - 2;
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if (nr_up < 0)
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nr_up = 0;
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break;
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}
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if (nr_up != cp->nr_up) {
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cp->nr_up = nr_up;
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con3270_rebuild_update(cp);
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con3270_update_status(cp);
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con3270_set_timer(cp, 1);
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}
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spin_unlock_irqrestore(&cp->view.lock, flags);
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/* Start keyboard reset command. */
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raw3270_request_reset(cp->kreset);
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raw3270_request_set_cmd(cp->kreset, TC_WRITE);
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raw3270_request_add_data(cp->kreset, &kreset_data, 1);
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raw3270_start(&cp->view, cp->kreset);
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if (deactivate)
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raw3270_deactivate_view(&cp->view);
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raw3270_request_reset(rrq);
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xchg(&cp->read, rrq);
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raw3270_put_view(&cp->view);
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}
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/*
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* Read request completion callback.
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*/
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static void
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con3270_read_callback(struct raw3270_request *rq, void *data)
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{
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raw3270_get_view(rq->view);
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/* Schedule tasklet to pass input to tty. */
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tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
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}
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/*
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* Issue a read request. Called only from interrupt function.
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*/
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static void
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con3270_issue_read(struct con3270 *cp)
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{
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struct raw3270_request *rrq;
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int rc;
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rrq = xchg(&cp->read, 0);
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if (!rrq)
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/* Read already scheduled. */
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return;
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rrq->callback = con3270_read_callback;
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rrq->callback_data = cp;
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raw3270_request_set_cmd(rrq, TC_READMOD);
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raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
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/* Issue the read modified request. */
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rc = raw3270_start_irq(&cp->view, rrq);
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if (rc)
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raw3270_request_reset(rrq);
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}
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/*
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* Switch to the console view.
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*/
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static int
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con3270_activate(struct raw3270_view *view)
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{
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struct con3270 *cp;
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cp = (struct con3270 *) view;
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cp->update_flags = CON_UPDATE_ALL;
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con3270_set_timer(cp, 1);
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return 0;
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}
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static void
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con3270_deactivate(struct raw3270_view *view)
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{
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struct con3270 *cp;
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cp = (struct con3270 *) view;
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del_timer(&cp->timer);
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}
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static void
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con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
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{
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/* Handle ATTN. Schedule tasklet to read aid. */
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if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
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con3270_issue_read(cp);
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if (rq) {
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if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
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rq->rc = -EIO;
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else
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/* Normal end. Copy residual count. */
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rq->rescnt = irb->scsw.cmd.count;
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} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
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/* Interrupt without an outstanding request -> update all */
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cp->update_flags = CON_UPDATE_ALL;
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con3270_set_timer(cp, 1);
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}
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}
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/* Console view to a 3270 device. */
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static struct raw3270_fn con3270_fn = {
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.activate = con3270_activate,
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.deactivate = con3270_deactivate,
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.intv = (void *) con3270_irq
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};
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static inline void
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con3270_cline_add(struct con3270 *cp)
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{
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if (!list_empty(&cp->cline->list))
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/* Already added. */
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return;
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list_add_tail(&cp->cline->list, &cp->lines);
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cp->nr_lines++;
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con3270_rebuild_update(cp);
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}
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static inline void
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con3270_cline_insert(struct con3270 *cp, unsigned char c)
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{
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cp->cline->string[cp->cline->len++] =
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cp->view.ascebc[(c < ' ') ? ' ' : c];
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if (list_empty(&cp->cline->update)) {
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list_add_tail(&cp->cline->update, &cp->update);
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cp->update_flags |= CON_UPDATE_LIST;
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}
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}
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static inline void
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con3270_cline_end(struct con3270 *cp)
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{
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struct string *s;
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unsigned int size;
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/* Copy cline. */
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size = (cp->cline->len < cp->view.cols - 5) ?
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cp->cline->len + 4 : cp->view.cols;
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s = con3270_alloc_string(cp, size);
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memcpy(s->string, cp->cline->string, cp->cline->len);
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if (cp->cline->len < cp->view.cols - 5) {
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s->string[s->len - 4] = TO_RA;
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s->string[s->len - 1] = 0;
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} else {
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while (--size >= cp->cline->len)
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s->string[size] = cp->view.ascebc[' '];
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}
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/* Replace cline with allocated line s and reset cline. */
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list_add(&s->list, &cp->cline->list);
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list_del_init(&cp->cline->list);
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if (!list_empty(&cp->cline->update)) {
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list_add(&s->update, &cp->cline->update);
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list_del_init(&cp->cline->update);
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}
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cp->cline->len = 0;
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}
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/*
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* Write a string to the 3270 console
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*/
|
|
static void
|
|
con3270_write(struct console *co, const char *str, unsigned int count)
|
|
{
|
|
struct con3270 *cp;
|
|
unsigned long flags;
|
|
unsigned char c;
|
|
|
|
cp = condev;
|
|
spin_lock_irqsave(&cp->view.lock, flags);
|
|
while (count-- > 0) {
|
|
c = *str++;
|
|
if (cp->cline->len == 0)
|
|
con3270_cline_add(cp);
|
|
if (c != '\n')
|
|
con3270_cline_insert(cp, c);
|
|
if (c == '\n' || cp->cline->len >= cp->view.cols)
|
|
con3270_cline_end(cp);
|
|
}
|
|
/* Setup timer to output current console buffer after 1/10 second */
|
|
cp->nr_up = 0;
|
|
if (cp->view.dev && !timer_pending(&cp->timer))
|
|
con3270_set_timer(cp, HZ/10);
|
|
spin_unlock_irqrestore(&cp->view.lock,flags);
|
|
}
|
|
|
|
static struct tty_driver *
|
|
con3270_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return tty3270_driver;
|
|
}
|
|
|
|
/*
|
|
* Wait for end of write request.
|
|
*/
|
|
static void
|
|
con3270_wait_write(struct con3270 *cp)
|
|
{
|
|
while (!cp->write) {
|
|
raw3270_wait_cons_dev(cp->view.dev);
|
|
barrier();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* panic() calls con3270_flush through a panic_notifier
|
|
* before the system enters a disabled, endless loop.
|
|
*/
|
|
static void
|
|
con3270_flush(void)
|
|
{
|
|
struct con3270 *cp;
|
|
unsigned long flags;
|
|
|
|
cp = condev;
|
|
if (!cp->view.dev)
|
|
return;
|
|
raw3270_pm_unfreeze(&cp->view);
|
|
raw3270_activate_view(&cp->view);
|
|
spin_lock_irqsave(&cp->view.lock, flags);
|
|
con3270_wait_write(cp);
|
|
cp->nr_up = 0;
|
|
con3270_rebuild_update(cp);
|
|
con3270_update_status(cp);
|
|
while (cp->update_flags != 0) {
|
|
spin_unlock_irqrestore(&cp->view.lock, flags);
|
|
con3270_update(&cp->timer);
|
|
spin_lock_irqsave(&cp->view.lock, flags);
|
|
con3270_wait_write(cp);
|
|
}
|
|
spin_unlock_irqrestore(&cp->view.lock, flags);
|
|
}
|
|
|
|
static int con3270_notify(struct notifier_block *self,
|
|
unsigned long event, void *data)
|
|
{
|
|
con3270_flush();
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block on_panic_nb = {
|
|
.notifier_call = con3270_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
static struct notifier_block on_reboot_nb = {
|
|
.notifier_call = con3270_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
/*
|
|
* The console structure for the 3270 console
|
|
*/
|
|
static struct console con3270 = {
|
|
.name = "tty3270",
|
|
.write = con3270_write,
|
|
.device = con3270_device,
|
|
.flags = CON_PRINTBUFFER,
|
|
};
|
|
|
|
/*
|
|
* 3270 console initialization code called from console_init().
|
|
*/
|
|
static int __init
|
|
con3270_init(void)
|
|
{
|
|
struct raw3270 *rp;
|
|
void *cbuf;
|
|
int i;
|
|
|
|
/* Check if 3270 is to be the console */
|
|
if (!CONSOLE_IS_3270)
|
|
return -ENODEV;
|
|
|
|
/* Set the console mode for VM */
|
|
if (MACHINE_IS_VM) {
|
|
cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
|
|
cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
|
|
}
|
|
|
|
rp = raw3270_setup_console();
|
|
if (IS_ERR(rp))
|
|
return PTR_ERR(rp);
|
|
|
|
condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
|
|
if (!condev)
|
|
return -ENOMEM;
|
|
condev->view.dev = rp;
|
|
|
|
condev->read = raw3270_request_alloc(0);
|
|
condev->read->callback = con3270_read_callback;
|
|
condev->read->callback_data = condev;
|
|
condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE);
|
|
condev->kreset = raw3270_request_alloc(1);
|
|
|
|
INIT_LIST_HEAD(&condev->lines);
|
|
INIT_LIST_HEAD(&condev->update);
|
|
timer_setup(&condev->timer, con3270_update, 0);
|
|
tasklet_init(&condev->readlet,
|
|
(void (*)(unsigned long)) con3270_read_tasklet,
|
|
(unsigned long) condev->read);
|
|
|
|
raw3270_add_view(&condev->view, &con3270_fn, 1);
|
|
|
|
INIT_LIST_HEAD(&condev->freemem);
|
|
for (i = 0; i < CON3270_STRING_PAGES; i++) {
|
|
cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
|
|
}
|
|
condev->cline = alloc_string(&condev->freemem, condev->view.cols);
|
|
condev->cline->len = 0;
|
|
con3270_create_status(condev);
|
|
condev->input = alloc_string(&condev->freemem, 80);
|
|
atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
|
|
register_reboot_notifier(&on_reboot_nb);
|
|
register_console(&con3270);
|
|
return 0;
|
|
}
|
|
|
|
console_initcall(con3270_init);
|