summaryrefslogtreecommitdiff
path: root/drivers/s390/char/con3270.c
blob: bb6b0df50b33618ae337f623038d042f96a2430a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
/*
 * 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/console.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.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;

/*
 * 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 con3270 *);

/*
 * 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 >= cp->view.cols - 5)
		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 con3270 *cp)
{
	struct raw3270_request *wrq;
	char wcc, prolog[6];
	unsigned long flags;
	unsigned long updated;
	struct string *s, *n;
	int rc;

	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(struct raw3270_request *rrq)
{
	static char kreset_data = TW_KR;
	struct con3270 *cp;
	unsigned long flags;
	int nr_up, deactivate;

	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 int
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;
	}
	return RAW3270_IO_DONE;
}

/* 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 (s->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();
	}
}

/*
 * panic() calls con3270_flush through a panic_notifier
 * before the system enters a disabled, endless loop.
 */
static void
con3270_flush(void)
{
	struct con3270 *cp;
	unsigned long flags;

	cp = condev;
	if (!cp->view.dev)
		return;
	raw3270_pm_unfreeze(&cp->view);
	spin_lock_irqsave(&cp->view.lock, flags);
	con3270_wait_write(cp);
	cp->nr_up = 0;
	con3270_rebuild_update(cp);
	con3270_update_status(cp);
	while (cp->update_flags != 0) {
		spin_unlock_irqrestore(&cp->view.lock, flags);
		con3270_update(cp);
		spin_lock_irqsave(&cp->view.lock, flags);
		con3270_wait_write(cp);
	}
	spin_unlock_irqrestore(&cp->view.lock, flags);
}

static int con3270_notify(struct notifier_block *self,
			  unsigned long event, void *data)
{
	con3270_flush();
	return NOTIFY_OK;
}

static struct notifier_block on_panic_nb = {
	.notifier_call = con3270_notify,
	.priority = 0,
};

static struct notifier_block on_reboot_nb = {
	.notifier_call = con3270_notify,
	.priority = 0,
};

/*
 *  The console structure for the 3270 console
 */
static struct console con3270 = {
	.name	 = "tty3270",
	.write	 = con3270_write,
	.device	 = con3270_device,
	.flags	 = CON_PRINTBUFFER,
};

/*
 * 3270 console initialization code called from console_init().
 */
static int __init
con3270_init(void)
{
	struct raw3270 *rp;
	void *cbuf;
	int i;

	/* Check if 3270 is to be the console */
	if (!CONSOLE_IS_3270)
		return -ENODEV;

	/* Set the console mode for VM */
	if (MACHINE_IS_VM) {
		cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
		cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
	}

	rp = raw3270_setup_console();
	if (IS_ERR(rp))
		return PTR_ERR(rp);

	condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
	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);
	setup_timer(&condev->timer, (void (*)(unsigned long)) con3270_update,
		    (unsigned long) condev);
	tasklet_init(&condev->readlet, 
		     (void (*)(unsigned long)) con3270_read_tasklet,
		     (unsigned long) condev->read);

	raw3270_add_view(&condev->view, &con3270_fn, 1);

	INIT_LIST_HEAD(&condev->freemem);
	for (i = 0; i < CON3270_STRING_PAGES; i++) {
		cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
		add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
	}
	condev->cline = alloc_string(&condev->freemem, condev->view.cols);
	condev->cline->len = 0;
	con3270_create_status(condev);
	condev->input = alloc_string(&condev->freemem, 80);
	atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
	register_reboot_notifier(&on_reboot_nb);
	register_console(&con3270);
	return 0;
}

console_initcall(con3270_init);