1 files changed, 651 insertions, 0 deletions

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
new file mode 100644
index 000000000..10f6a37fb
--- /dev/null
+++ b/drivers/s390/char/con3270.c
@@ -0,0 +1,651 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * IBM/3270 Driver - console view.
+ *
+ * Author(s):
+ *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
+ *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *     Copyright IBM Corp. 2003, 2009
+ */
+
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/panic_notifier.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/reboot.h>
+
+#include <asm/ccwdev.h>
+#include <asm/cio.h>
+#include <asm/cpcmd.h>
+#include <asm/ebcdic.h>
+
+#include "raw3270.h"
+#include "tty3270.h"
+#include "ctrlchar.h"
+
+#define CON3270_OUTPUT_BUFFER_SIZE 1024
+#define CON3270_STRING_PAGES 4
+
+static struct raw3270_fn con3270_fn;
+
+static bool auto_update = true;
+module_param(auto_update, bool, 0);
+
+/*
+ * Main 3270 console view data structure.
+ */
+struct con3270 {
+	struct raw3270_view view;
+	struct list_head freemem;	/* list of free memory for strings. */
+
+	/* Output stuff. */
+	struct list_head lines;		/* list of lines. */
+	struct list_head update;	/* list of lines to update. */
+	int line_nr;			/* line number for next update. */
+	int nr_lines;			/* # lines in list. */
+	int nr_up;			/* # lines up in history. */
+	unsigned long update_flags;	/* Update indication bits. */
+	struct string *cline;		/* current output line. */
+	struct string *status;		/* last line of display. */
+	struct raw3270_request *write;	/* single write request. */
+	struct timer_list timer;
+
+	/* Input stuff. */
+	struct string *input;		/* input string for read request. */
+	struct raw3270_request *read;	/* single read request. */
+	struct raw3270_request *kreset;	/* single keyboard reset request. */
+	struct tasklet_struct readlet;	/* tasklet to issue read request. */
+};
+
+static struct con3270 *condev;
+
+/* con3270->update_flags. See con3270_update for details. */
+#define CON_UPDATE_ERASE	1	/* Use EWRITEA instead of WRITE. */
+#define CON_UPDATE_LIST		2	/* Update lines in tty3270->update. */
+#define CON_UPDATE_STATUS	4	/* Update status line. */
+#define CON_UPDATE_ALL		8	/* Recreate screen. */
+
+static void con3270_update(struct timer_list *);
+
+/*
+ * Setup timeout for a device. On timeout trigger an update.
+ */
+static void con3270_set_timer(struct con3270 *cp, int expires)
+{
+	if (expires == 0)
+		del_timer(&cp->timer);
+	else
+		mod_timer(&cp->timer, jiffies + expires);
+}
+
+/*
+ * The status line is the last line of the screen. It shows the string
+ * "console view" in the lower left corner and "Running"/"More..."/"Holding"
+ * in the lower right corner of the screen.
+ */
+static void
+con3270_update_status(struct con3270 *cp)
+{
+	char *str;
+
+	str = (cp->nr_up != 0) ? "History" : "Running";
+	memcpy(cp->status->string + 24, str, 7);
+	codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
+	cp->update_flags |= CON_UPDATE_STATUS;
+}
+
+static void
+con3270_create_status(struct con3270 *cp)
+{
+	static const unsigned char blueprint[] =
+		{ TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
+		  'c','o','n','s','o','l','e',' ','v','i','e','w',
+		  TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
+
+	cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
+	/* Copy blueprint to status line */
+	memcpy(cp->status->string, blueprint, sizeof(blueprint));
+	/* Set TO_RA addresses. */
+	raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
+			       cp->view.cols * (cp->view.rows - 1));
+	raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
+			       cp->view.cols * cp->view.rows - 8);
+	/* Convert strings to ebcdic. */
+	codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
+	codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
+}
+
+/*
+ * Set output offsets to 3270 datastream fragment of a console string.
+ */
+static void
+con3270_update_string(struct con3270 *cp, struct string *s, int nr)
+{
+	if (s->len < 4) {
+		/* This indicates a bug, but printing a warning would
+		 * cause a deadlock. */
+		return;
+	}
+	if (s->string[s->len - 4] != TO_RA)
+		return;
+	raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
+			       cp->view.cols * (nr + 1));
+}
+
+/*
+ * Rebuild update list to print all lines.
+ */
+static void
+con3270_rebuild_update(struct con3270 *cp)
+{
+	struct string *s, *n;
+	int nr;
+
+	/* 
+	 * Throw away update list and create a new one,
+	 * containing all lines that will fit on the screen.
+	 */
+	list_for_each_entry_safe(s, n, &cp->update, update)
+		list_del_init(&s->update);
+	nr = cp->view.rows - 2 + cp->nr_up;
+	list_for_each_entry_reverse(s, &cp->lines, list) {
+		if (nr < cp->view.rows - 1)
+			list_add(&s->update, &cp->update);
+		if (--nr < 0)
+			break;
+	}
+	cp->line_nr = 0;
+	cp->update_flags |= CON_UPDATE_LIST;
+}
+
+/*
+ * Alloc string for size bytes. Free strings from history if necessary.
+ */
+static struct string *
+con3270_alloc_string(struct con3270 *cp, size_t size)
+{
+	struct string *s, *n;
+
+	s = alloc_string(&cp->freemem, size);
+	if (s)
+		return s;
+	list_for_each_entry_safe(s, n, &cp->lines, list) {
+		list_del(&s->list);
+		if (!list_empty(&s->update))
+			list_del(&s->update);
+		cp->nr_lines--;
+		if (free_string(&cp->freemem, s) >= size)
+			break;
+	}
+	s = alloc_string(&cp->freemem, size);
+	BUG_ON(!s);
+	if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
+		cp->nr_up = cp->nr_lines - cp->view.rows + 1;
+		con3270_rebuild_update(cp);
+		con3270_update_status(cp);
+	}
+	return s;
+}
+
+/*
+ * Write completion callback.
+ */
+static void
+con3270_write_callback(struct raw3270_request *rq, void *data)
+{
+	raw3270_request_reset(rq);
+	xchg(&((struct con3270 *) rq->view)->write, rq);
+}
+
+/*
+ * Update console display.
+ */
+static void
+con3270_update(struct timer_list *t)
+{
+	struct con3270 *cp = from_timer(cp, t, timer);
+	struct raw3270_request *wrq;
+	char wcc, prolog[6];
+	unsigned long flags;
+	unsigned long updated;
+	struct string *s, *n;
+	int rc;
+
+	if (!auto_update && !raw3270_view_active(&cp->view))
+		return;
+	if (cp->view.dev)
+		raw3270_activate_view(&cp->view);
+
+	wrq = xchg(&cp->write, 0);
+	if (!wrq) {
+		con3270_set_timer(cp, 1);
+		return;
+	}
+
+	spin_lock_irqsave(&cp->view.lock, flags);
+	updated = 0;
+	if (cp->update_flags & CON_UPDATE_ALL) {
+		con3270_rebuild_update(cp);
+		con3270_update_status(cp);
+		cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
+			CON_UPDATE_STATUS;
+	}
+	if (cp->update_flags & CON_UPDATE_ERASE) {
+		/* Use erase write alternate to initialize display. */
+		raw3270_request_set_cmd(wrq, TC_EWRITEA);
+		updated |= CON_UPDATE_ERASE;
+	} else
+		raw3270_request_set_cmd(wrq, TC_WRITE);
+
+	wcc = TW_NONE;
+	raw3270_request_add_data(wrq, &wcc, 1);
+
+	/*
+	 * Update status line.
+	 */
+	if (cp->update_flags & CON_UPDATE_STATUS)
+		if (raw3270_request_add_data(wrq, cp->status->string,
+					     cp->status->len) == 0)
+			updated |= CON_UPDATE_STATUS;
+
+	if (cp->update_flags & CON_UPDATE_LIST) {
+		prolog[0] = TO_SBA;
+		prolog[3] = TO_SA;
+		prolog[4] = TAT_COLOR;
+		prolog[5] = TAC_TURQ;
+		raw3270_buffer_address(cp->view.dev, prolog + 1,
+				       cp->view.cols * cp->line_nr);
+		raw3270_request_add_data(wrq, prolog, 6);
+		/* Write strings in the update list to the screen. */
+		list_for_each_entry_safe(s, n, &cp->update, update) {
+			if (s != cp->cline)
+				con3270_update_string(cp, s, cp->line_nr);
+			if (raw3270_request_add_data(wrq, s->string,
+						     s->len) != 0)
+				break;
+			list_del_init(&s->update);
+			if (s != cp->cline)
+				cp->line_nr++;
+		}
+		if (list_empty(&cp->update))
+			updated |= CON_UPDATE_LIST;
+	}
+	wrq->callback = con3270_write_callback;
+	rc = raw3270_start(&cp->view, wrq);
+	if (rc == 0) {
+		cp->update_flags &= ~updated;
+		if (cp->update_flags)
+			con3270_set_timer(cp, 1);
+	} else {
+		raw3270_request_reset(wrq);
+		xchg(&cp->write, wrq);
+	}
+	spin_unlock_irqrestore(&cp->view.lock, flags);
+}
+
+/*
+ * Read tasklet.
+ */
+static void
+con3270_read_tasklet(unsigned long data)
+{
+	static char kreset_data = TW_KR;
+	struct raw3270_request *rrq;
+	struct con3270 *cp;
+	unsigned long flags;
+	int nr_up, deactivate;
+
+	rrq = (struct raw3270_request *)data;
+	cp = (struct con3270 *) rrq->view;
+	spin_lock_irqsave(&cp->view.lock, flags);
+	nr_up = cp->nr_up;
+	deactivate = 0;
+	/* Check aid byte. */
+	switch (cp->input->string[0]) {
+	case 0x7d:	/* enter: jump to bottom. */
+		nr_up = 0;
+		break;
+	case 0xf3:	/* PF3: deactivate the console view. */
+		deactivate = 1;
+		break;
+	case 0x6d:	/* clear: start from scratch. */
+		cp->update_flags = CON_UPDATE_ALL;
+		con3270_set_timer(cp, 1);
+		break;
+	case 0xf7:	/* PF7: do a page up in the console log. */
+		nr_up += cp->view.rows - 2;
+		if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
+			nr_up = cp->nr_lines - cp->view.rows + 1;
+			if (nr_up < 0)
+				nr_up = 0;
+		}
+		break;
+	case 0xf8:	/* PF8: do a page down in the console log. */
+		nr_up -= cp->view.rows - 2;
+		if (nr_up < 0)
+			nr_up = 0;
+		break;
+	}
+	if (nr_up != cp->nr_up) {
+		cp->nr_up = nr_up;
+		con3270_rebuild_update(cp);
+		con3270_update_status(cp);
+		con3270_set_timer(cp, 1);
+	}
+	spin_unlock_irqrestore(&cp->view.lock, flags);
+
+	/* Start keyboard reset command. */
+	raw3270_request_reset(cp->kreset);
+	raw3270_request_set_cmd(cp->kreset, TC_WRITE);
+	raw3270_request_add_data(cp->kreset, &kreset_data, 1);
+	raw3270_start(&cp->view, cp->kreset);
+
+	if (deactivate)
+		raw3270_deactivate_view(&cp->view);
+
+	raw3270_request_reset(rrq);
+	xchg(&cp->read, rrq);
+	raw3270_put_view(&cp->view);
+}
+
+/*
+ * Read request completion callback.
+ */
+static void
+con3270_read_callback(struct raw3270_request *rq, void *data)
+{
+	raw3270_get_view(rq->view);
+	/* Schedule tasklet to pass input to tty. */
+	tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
+}
+
+/*
+ * Issue a read request. Called only from interrupt function.
+ */
+static void
+con3270_issue_read(struct con3270 *cp)
+{
+	struct raw3270_request *rrq;
+	int rc;
+
+	rrq = xchg(&cp->read, 0);
+	if (!rrq)
+		/* Read already scheduled. */
+		return;
+	rrq->callback = con3270_read_callback;
+	rrq->callback_data = cp;
+	raw3270_request_set_cmd(rrq, TC_READMOD);
+	raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
+	/* Issue the read modified request. */
+	rc = raw3270_start_irq(&cp->view, rrq);
+	if (rc)
+		raw3270_request_reset(rrq);
+}
+
+/*
+ * Switch to the console view.
+ */
+static int
+con3270_activate(struct raw3270_view *view)
+{
+	struct con3270 *cp;
+
+	cp = (struct con3270 *) view;
+	cp->update_flags = CON_UPDATE_ALL;
+	con3270_set_timer(cp, 1);
+	return 0;
+}
+
+static void
+con3270_deactivate(struct raw3270_view *view)
+{
+	struct con3270 *cp;
+
+	cp = (struct con3270 *) view;
+	del_timer(&cp->timer);
+}
+
+static void
+con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
+{
+	/* Handle ATTN. Schedule tasklet to read aid. */
+	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
+		con3270_issue_read(cp);
+
+	if (rq) {
+		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
+			rq->rc = -EIO;
+		else
+			/* Normal end. Copy residual count. */
+			rq->rescnt = irb->scsw.cmd.count;
+	} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
+		/* Interrupt without an outstanding request -> update all */
+		cp->update_flags = CON_UPDATE_ALL;
+		con3270_set_timer(cp, 1);
+	}
+}
+
+/* Console view to a 3270 device. */
+static struct raw3270_fn con3270_fn = {
+	.activate = con3270_activate,
+	.deactivate = con3270_deactivate,
+	.intv = (void *) con3270_irq
+};
+
+static inline void
+con3270_cline_add(struct con3270 *cp)
+{
+	if (!list_empty(&cp->cline->list))
+		/* Already added. */
+		return;
+	list_add_tail(&cp->cline->list, &cp->lines);
+	cp->nr_lines++;
+	con3270_rebuild_update(cp);
+}
+
+static inline void
+con3270_cline_insert(struct con3270 *cp, unsigned char c)
+{
+	cp->cline->string[cp->cline->len++] = 
+		cp->view.ascebc[(c < ' ') ? ' ' : c];
+	if (list_empty(&cp->cline->update)) {
+		list_add_tail(&cp->cline->update, &cp->update);
+		cp->update_flags |= CON_UPDATE_LIST;
+	}
+}
+
+static inline void
+con3270_cline_end(struct con3270 *cp)
+{
+	struct string *s;
+	unsigned int size;
+
+	/* Copy cline. */
+	size = (cp->cline->len < cp->view.cols - 5) ?
+		cp->cline->len + 4 : cp->view.cols;
+	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);