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0d55303c51
All the current architecture specific defines for these are the same. Refactor these common defines to a common header file. The new common linux/compat_time.h is also useful as it will eventually be used to hold all the defines that are needed for compat time types that support non y2038 safe types. New architectures need not have to define these new types as they will only use new y2038 safe syscalls. This file can be deleted after y2038 when we stop supporting non y2038 safe syscalls. The patch also requires an operation similar to: git grep "asm/compat\.h" | cut -d ":" -f 1 | xargs -n 1 sed -i -e "s%asm/compat.h%linux/compat.h%g" Cc: acme@kernel.org Cc: benh@kernel.crashing.org Cc: borntraeger@de.ibm.com Cc: catalin.marinas@arm.com Cc: cmetcalf@mellanox.com Cc: cohuck@redhat.com Cc: davem@davemloft.net Cc: deller@gmx.de Cc: devel@driverdev.osuosl.org Cc: gerald.schaefer@de.ibm.com Cc: gregkh@linuxfoundation.org Cc: heiko.carstens@de.ibm.com Cc: hoeppner@linux.vnet.ibm.com Cc: hpa@zytor.com Cc: jejb@parisc-linux.org Cc: jwi@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: mark.rutland@arm.com Cc: mingo@redhat.com Cc: mpe@ellerman.id.au Cc: oberpar@linux.vnet.ibm.com Cc: oprofile-list@lists.sf.net Cc: paulus@samba.org Cc: peterz@infradead.org Cc: ralf@linux-mips.org Cc: rostedt@goodmis.org Cc: rric@kernel.org Cc: schwidefsky@de.ibm.com Cc: sebott@linux.vnet.ibm.com Cc: sparclinux@vger.kernel.org Cc: sth@linux.vnet.ibm.com Cc: ubraun@linux.vnet.ibm.com Cc: will.deacon@arm.com Cc: x86@kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: James Hogan <jhogan@kernel.org> Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
576 lines
13 KiB
C
576 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IBM/3270 Driver - fullscreen driver.
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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 2.5/2.6 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/bootmem.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/compat.h>
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#include <linux/sched/signal.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/ebcdic.h>
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#include <asm/idals.h>
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#include "raw3270.h"
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#include "ctrlchar.h"
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static struct raw3270_fn fs3270_fn;
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struct fs3270 {
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struct raw3270_view view;
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struct pid *fs_pid; /* Pid of controlling program. */
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int read_command; /* ccw command to use for reads. */
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int write_command; /* ccw command to use for writes. */
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int attention; /* Got attention. */
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int active; /* Fullscreen view is active. */
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struct raw3270_request *init; /* single init request. */
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wait_queue_head_t wait; /* Init & attention wait queue. */
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struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */
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size_t rdbuf_size; /* size of data returned by RDBUF */
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};
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static DEFINE_MUTEX(fs3270_mutex);
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static void
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fs3270_wake_up(struct raw3270_request *rq, void *data)
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{
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wake_up((wait_queue_head_t *) data);
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}
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static inline int
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fs3270_working(struct fs3270 *fp)
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{
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/*
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* The fullscreen view is in working order if the view
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* has been activated AND the initial request is finished.
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*/
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return fp->active && raw3270_request_final(fp->init);
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}
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static int
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fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct fs3270 *fp;
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int rc;
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fp = (struct fs3270 *) view;
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rq->callback = fs3270_wake_up;
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rq->callback_data = &fp->wait;
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do {
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if (!fs3270_working(fp)) {
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/* Fullscreen view isn't ready yet. */
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rc = wait_event_interruptible(fp->wait,
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fs3270_working(fp));
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if (rc != 0)
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break;
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}
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rc = raw3270_start(view, rq);
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if (rc == 0) {
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/* Started successfully. Now wait for completion. */
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wait_event(fp->wait, raw3270_request_final(rq));
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}
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} while (rc == -EACCES);
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return rc;
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}
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/*
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* Switch to the fullscreen view.
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*/
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static void
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fs3270_reset_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static void
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fs3270_restore_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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if (rq->rc != 0 || rq->rescnt != 0) {
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if (fp->fs_pid)
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kill_pid(fp->fs_pid, SIGHUP, 1);
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}
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fp->rdbuf_size = 0;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static int
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fs3270_activate(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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char *cp;
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int rc;
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fp = (struct fs3270 *) view;
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/* If an old init command is still running just return. */
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if (!raw3270_request_final(fp->init))
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return 0;
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if (fp->rdbuf_size == 0) {
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/* No saved buffer. Just clear the screen. */
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raw3270_request_set_cmd(fp->init, TC_EWRITEA);
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fp->init->callback = fs3270_reset_callback;
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} else {
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/* Restore fullscreen buffer saved by fs3270_deactivate. */
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raw3270_request_set_cmd(fp->init, TC_EWRITEA);
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raw3270_request_set_idal(fp->init, fp->rdbuf);
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fp->init->ccw.count = fp->rdbuf_size;
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cp = fp->rdbuf->data[0];
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cp[0] = TW_KR;
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cp[1] = TO_SBA;
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cp[2] = cp[6];
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cp[3] = cp[7];
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cp[4] = TO_IC;
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cp[5] = TO_SBA;
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cp[6] = 0x40;
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cp[7] = 0x40;
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fp->init->rescnt = 0;
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fp->init->callback = fs3270_restore_callback;
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}
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rc = fp->init->rc = raw3270_start_locked(view, fp->init);
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if (rc)
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fp->init->callback(fp->init, NULL);
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else
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fp->active = 1;
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return rc;
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}
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/*
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* Shutdown fullscreen view.
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*/
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static void
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fs3270_save_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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/* Correct idal buffer element 0 address. */
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fp->rdbuf->data[0] -= 5;
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fp->rdbuf->size += 5;
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/*
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* If the rdbuf command failed or the idal buffer is
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* to small for the amount of data returned by the
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* rdbuf command, then we have no choice but to send
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* a SIGHUP to the application.
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*/
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if (rq->rc != 0 || rq->rescnt == 0) {
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if (fp->fs_pid)
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kill_pid(fp->fs_pid, SIGHUP, 1);
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fp->rdbuf_size = 0;
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} else
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fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static void
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fs3270_deactivate(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) view;
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fp->active = 0;
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/* If an old init command is still running just return. */
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if (!raw3270_request_final(fp->init))
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return;
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/* Prepare read-buffer request. */
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raw3270_request_set_cmd(fp->init, TC_RDBUF);
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/*
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* Hackish: skip first 5 bytes of the idal buffer to make
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* room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence
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* in the activation command.
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*/
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fp->rdbuf->data[0] += 5;
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fp->rdbuf->size -= 5;
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raw3270_request_set_idal(fp->init, fp->rdbuf);
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fp->init->rescnt = 0;
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fp->init->callback = fs3270_save_callback;
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/* Start I/O to read in the 3270 buffer. */
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fp->init->rc = raw3270_start_locked(view, fp->init);
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if (fp->init->rc)
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fp->init->callback(fp->init, NULL);
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}
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static void
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fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb)
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{
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/* Handle ATTN. Set indication and wake waiters for attention. */
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if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
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fp->attention = 1;
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wake_up(&fp->wait);
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}
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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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}
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}
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/*
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* Process reads from fullscreen 3270.
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*/
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static ssize_t
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fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off)
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{
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struct fs3270 *fp;
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struct raw3270_request *rq;
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struct idal_buffer *ib;
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ssize_t rc;
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if (count == 0 || count > 65535)
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return -EINVAL;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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ib = idal_buffer_alloc(count, 0);
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if (IS_ERR(ib))
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return -ENOMEM;
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rq = raw3270_request_alloc(0);
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if (!IS_ERR(rq)) {
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if (fp->read_command == 0 && fp->write_command != 0)
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fp->read_command = 6;
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raw3270_request_set_cmd(rq, fp->read_command ? : 2);
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raw3270_request_set_idal(rq, ib);
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rc = wait_event_interruptible(fp->wait, fp->attention);
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fp->attention = 0;
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if (rc == 0) {
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rc = fs3270_do_io(&fp->view, rq);
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if (rc == 0) {
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count -= rq->rescnt;
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if (idal_buffer_to_user(ib, data, count) != 0)
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rc = -EFAULT;
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else
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rc = count;
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}
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}
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raw3270_request_free(rq);
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} else
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rc = PTR_ERR(rq);
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idal_buffer_free(ib);
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return rc;
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}
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/*
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* Process writes to fullscreen 3270.
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*/
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static ssize_t
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fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off)
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{
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struct fs3270 *fp;
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struct raw3270_request *rq;
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struct idal_buffer *ib;
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int write_command;
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ssize_t rc;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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ib = idal_buffer_alloc(count, 0);
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if (IS_ERR(ib))
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return -ENOMEM;
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rq = raw3270_request_alloc(0);
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if (!IS_ERR(rq)) {
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if (idal_buffer_from_user(ib, data, count) == 0) {
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write_command = fp->write_command ? : 1;
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if (write_command == 5)
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write_command = 13;
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raw3270_request_set_cmd(rq, write_command);
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raw3270_request_set_idal(rq, ib);
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rc = fs3270_do_io(&fp->view, rq);
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if (rc == 0)
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rc = count - rq->rescnt;
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} else
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rc = -EFAULT;
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raw3270_request_free(rq);
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} else
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rc = PTR_ERR(rq);
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idal_buffer_free(ib);
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return rc;
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}
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/*
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* process ioctl commands for the tube driver
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*/
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static long
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fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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char __user *argp;
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struct fs3270 *fp;
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struct raw3270_iocb iocb;
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int rc;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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if (is_compat_task())
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argp = compat_ptr(arg);
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else
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argp = (char __user *)arg;
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rc = 0;
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mutex_lock(&fs3270_mutex);
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switch (cmd) {
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case TUBICMD:
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fp->read_command = arg;
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break;
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case TUBOCMD:
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fp->write_command = arg;
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break;
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case TUBGETI:
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rc = put_user(fp->read_command, argp);
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break;
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case TUBGETO:
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rc = put_user(fp->write_command, argp);
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break;
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case TUBGETMOD:
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iocb.model = fp->view.model;
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iocb.line_cnt = fp->view.rows;
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iocb.col_cnt = fp->view.cols;
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iocb.pf_cnt = 24;
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iocb.re_cnt = 20;
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iocb.map = 0;
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if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb)))
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rc = -EFAULT;
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break;
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}
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mutex_unlock(&fs3270_mutex);
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return rc;
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}
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/*
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* Allocate fs3270 structure.
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*/
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static struct fs3270 *
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fs3270_alloc_view(void)
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{
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struct fs3270 *fp;
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fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL);
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if (!fp)
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return ERR_PTR(-ENOMEM);
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fp->init = raw3270_request_alloc(0);
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if (IS_ERR(fp->init)) {
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kfree(fp);
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return ERR_PTR(-ENOMEM);
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}
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return fp;
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}
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/*
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* Free fs3270 structure.
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*/
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static void
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fs3270_free_view(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) view;
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if (fp->rdbuf)
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idal_buffer_free(fp->rdbuf);
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raw3270_request_free(((struct fs3270 *) view)->init);
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kfree(view);
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}
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/*
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* Unlink fs3270 data structure from filp.
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*/
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static void
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fs3270_release(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) view;
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if (fp->fs_pid)
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kill_pid(fp->fs_pid, SIGHUP, 1);
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}
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/* View to a 3270 device. Can be console, tty or fullscreen. */
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static struct raw3270_fn fs3270_fn = {
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.activate = fs3270_activate,
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.deactivate = fs3270_deactivate,
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.intv = (void *) fs3270_irq,
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.release = fs3270_release,
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.free = fs3270_free_view
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};
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/*
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* This routine is called whenever a 3270 fullscreen device is opened.
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*/
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static int
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fs3270_open(struct inode *inode, struct file *filp)
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{
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struct fs3270 *fp;
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struct idal_buffer *ib;
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int minor, rc = 0;
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if (imajor(file_inode(filp)) != IBM_FS3270_MAJOR)
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return -ENODEV;
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minor = iminor(file_inode(filp));
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/* Check for minor 0 multiplexer. */
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if (minor == 0) {
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struct tty_struct *tty = get_current_tty();
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if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
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tty_kref_put(tty);
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return -ENODEV;
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}
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minor = tty->index;
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tty_kref_put(tty);
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}
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mutex_lock(&fs3270_mutex);
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/* Check if some other program is already using fullscreen mode. */
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fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
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if (!IS_ERR(fp)) {
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raw3270_put_view(&fp->view);
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rc = -EBUSY;
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goto out;
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}
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/* Allocate fullscreen view structure. */
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fp = fs3270_alloc_view();
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if (IS_ERR(fp)) {
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rc = PTR_ERR(fp);
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goto out;
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}
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init_waitqueue_head(&fp->wait);
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fp->fs_pid = get_pid(task_pid(current));
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rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
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if (rc) {
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fs3270_free_view(&fp->view);
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goto out;
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}
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/* Allocate idal-buffer. */
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ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0);
|
|
if (IS_ERR(ib)) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
rc = PTR_ERR(ib);
|
|
goto out;
|
|
}
|
|
fp->rdbuf = ib;
|
|
|
|
rc = raw3270_activate_view(&fp->view);
|
|
if (rc) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
goto out;
|
|
}
|
|
nonseekable_open(inode, filp);
|
|
filp->private_data = fp;
|
|
out:
|
|
mutex_unlock(&fs3270_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This routine is called when the 3270 tty is closed. We wait
|
|
* for the remaining request to be completed. Then we clean up.
|
|
*/
|
|
static int
|
|
fs3270_close(struct inode *inode, struct file *filp)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = filp->private_data;
|
|
filp->private_data = NULL;
|
|
if (fp) {
|
|
put_pid(fp->fs_pid);
|
|
fp->fs_pid = NULL;
|
|
raw3270_reset(&fp->view);
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations fs3270_fops = {
|
|
.owner = THIS_MODULE, /* owner */
|
|
.read = fs3270_read, /* read */
|
|
.write = fs3270_write, /* write */
|
|
.unlocked_ioctl = fs3270_ioctl, /* ioctl */
|
|
.compat_ioctl = fs3270_ioctl, /* ioctl */
|
|
.open = fs3270_open, /* open */
|
|
.release = fs3270_close, /* release */
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static void fs3270_create_cb(int minor)
|
|
{
|
|
__register_chrdev(IBM_FS3270_MAJOR, minor, 1, "tub", &fs3270_fops);
|
|
device_create(class3270, NULL, MKDEV(IBM_FS3270_MAJOR, minor),
|
|
NULL, "3270/tub%d", minor);
|
|
}
|
|
|
|
static void fs3270_destroy_cb(int minor)
|
|
{
|
|
device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, minor));
|
|
__unregister_chrdev(IBM_FS3270_MAJOR, minor, 1, "tub");
|
|
}
|
|
|
|
static struct raw3270_notifier fs3270_notifier =
|
|
{
|
|
.create = fs3270_create_cb,
|
|
.destroy = fs3270_destroy_cb,
|
|
};
|
|
|
|
/*
|
|
* 3270 fullscreen driver initialization.
|
|
*/
|
|
static int __init
|
|
fs3270_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = __register_chrdev(IBM_FS3270_MAJOR, 0, 1, "fs3270", &fs3270_fops);
|
|
if (rc)
|
|
return rc;
|
|
device_create(class3270, NULL, MKDEV(IBM_FS3270_MAJOR, 0),
|
|
NULL, "3270/tub");
|
|
raw3270_register_notifier(&fs3270_notifier);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
fs3270_exit(void)
|
|
{
|
|
raw3270_unregister_notifier(&fs3270_notifier);
|
|
device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, 0));
|
|
__unregister_chrdev(IBM_FS3270_MAJOR, 0, 1, "fs3270");
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR);
|
|
|
|
module_init(fs3270_init);
|
|
module_exit(fs3270_exit);
|