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![Guilherme G. Piccoli](/assets/img/avatar_default.png)
Currently many console drivers for s390 rely on panic/reboot notifiers to invoke callbacks on these events. The panic() function disables local IRQs, secondary CPUs and preemption, so callbacks invoked on panic are effectively running in atomic context. Happens that most of these console callbacks from s390 doesn't take the proper care with regards to atomic context, like taking spinlocks that might be taken in other function/CPU and hence will cause a lockup situation. The goal for this patch is to improve the notifiers reliability, acting on 4 console drivers, as detailed below: (1) con3215: changed a regular spinlock to the trylock alternative. (2) con3270: also changed a regular spinlock to its trylock counterpart, but here we also have another problem: raw3270_activate_view() takes a different spinlock. So, we worked a helper to validate if this other lock is safe to acquire, and if so, raw3270_activate_view() should be safe. Notice though that there is a functional change here: it's now possible to continue the notifier code [reaching con3270_wait_write() and con3270_rebuild_update()] without executing raw3270_activate_view(). (3) sclp: a global lock is used heavily in the functions called from the notifier, so we added a check here - if the lock is taken already, we just bail-out, preventing the lockup. (4) sclp_vt220: same as (3), a lock validation was added to prevent the potential lockup problem. Besides (1)-(4), we also removed useless void functions, adding the code called from the notifier inside its own body, and changed the priority of such notifiers to execute late, since they are "heavyweight" for the panic environment, so we aim to reduce risks here. Changed return values to NOTIFY_DONE as well, the standard one. Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Link: https://lore.kernel.org/r/20220427224924.592546-14-gpiccoli@igalia.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
651 lines
16 KiB
C
651 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/panic_notifier.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(unsigned long data)
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{
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static char kreset_data = TW_KR;
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struct raw3270_request *rrq;
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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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rrq = (struct raw3270_request *)data;
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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);
|
|
memcpy(s->string, cp->cline->string, cp->cline->len);
|
|
if (cp->cline->len < cp->view.cols - 5) {
|
|
s->string[s->len - 4] = TO_RA;
|
|
s->string[s->len - 1] = 0;
|
|
} else {
|
|
while (--size >= cp->cline->len)
|
|
s->string[size] = cp->view.ascebc[' '];
|
|
}
|
|
/* Replace cline with allocated line s and reset cline. */
|
|
list_add(&s->list, &cp->cline->list);
|
|
list_del_init(&cp->cline->list);
|
|
if (!list_empty(&cp->cline->update)) {
|
|
list_add(&s->update, &cp->cline->update);
|
|
list_del_init(&cp->cline->update);
|
|
}
|
|
cp->cline->len = 0;
|
|
}
|
|
|
|
/*
|
|
* Write a string to the 3270 console
|
|
*/
|
|
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();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The below function is called as a panic/reboot notifier before the
|
|
* system enters a disabled, endless loop.
|
|
*
|
|
* Notice we must use the spin_trylock() alternative, to prevent lockups
|
|
* in atomic context (panic routine runs with secondary CPUs, local IRQs
|
|
* and preemption disabled).
|
|
*/
|
|
static int con3270_notify(struct notifier_block *self,
|
|
unsigned long event, void *data)
|
|
{
|
|
struct con3270 *cp;
|
|
unsigned long flags;
|
|
|
|
cp = condev;
|
|
if (!cp->view.dev)
|
|
return NOTIFY_DONE;
|
|
if (!raw3270_view_lock_unavailable(&cp->view))
|
|
raw3270_activate_view(&cp->view);
|
|
if (!spin_trylock_irqsave(&cp->view.lock, flags))
|
|
return NOTIFY_DONE;
|
|
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);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block on_panic_nb = {
|
|
.notifier_call = con3270_notify,
|
|
.priority = INT_MIN + 1, /* run the callback late */
|
|
};
|
|
|
|
static struct notifier_block on_reboot_nb = {
|
|
.notifier_call = con3270_notify,
|
|
.priority = INT_MIN + 1, /* run the callback late */
|
|
};
|
|
|
|
/*
|
|
* 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, con3270_read_tasklet,
|
|
(unsigned long) condev->read);
|
|
|
|
raw3270_add_view(&condev->view, &con3270_fn, 1, RAW3270_VIEW_LOCK_IRQ);
|
|
|
|
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);
|