1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * IBM/3270 Driver - console view.
4 *
5 * Author(s):
6 * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
7 * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
8 * Copyright IBM Corp. 2003, 2009
9 */
10
11 #include <linux/module.h>
12 #include <linux/console.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/list.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/err.h>
19 #include <linux/reboot.h>
20
21 #include <asm/ccwdev.h>
22 #include <asm/cio.h>
23 #include <asm/cpcmd.h>
24 #include <asm/ebcdic.h>
25
26 #include "raw3270.h"
27 #include "tty3270.h"
28 #include "ctrlchar.h"
29
30 #define CON3270_OUTPUT_BUFFER_SIZE 1024
31 #define CON3270_STRING_PAGES 4
32
33 static struct raw3270_fn con3270_fn;
34
35 static bool auto_update = true;
36 module_param(auto_update, bool, 0);
37
38 /*
39 * Main 3270 console view data structure.
40 */
41 struct con3270 {
42 struct raw3270_view view;
43 struct list_head freemem; /* list of free memory for strings. */
44
45 /* Output stuff. */
46 struct list_head lines; /* list of lines. */
47 struct list_head update; /* list of lines to update. */
48 int line_nr; /* line number for next update. */
49 int nr_lines; /* # lines in list. */
50 int nr_up; /* # lines up in history. */
51 unsigned long update_flags; /* Update indication bits. */
52 struct string *cline; /* current output line. */
53 struct string *status; /* last line of display. */
54 struct raw3270_request *write; /* single write request. */
55 struct timer_list timer;
56
57 /* Input stuff. */
58 struct string *input; /* input string for read request. */
59 struct raw3270_request *read; /* single read request. */
60 struct raw3270_request *kreset; /* single keyboard reset request. */
61 struct tasklet_struct readlet; /* tasklet to issue read request. */
62 };
63
64 static struct con3270 *condev;
65
66 /* con3270->update_flags. See con3270_update for details. */
67 #define CON_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */
68 #define CON_UPDATE_LIST 2 /* Update lines in tty3270->update. */
69 #define CON_UPDATE_STATUS 4 /* Update status line. */
70 #define CON_UPDATE_ALL 8 /* Recreate screen. */
71
72 static void con3270_update(struct timer_list *);
73
74 /*
75 * Setup timeout for a device. On timeout trigger an update.
76 */
con3270_set_timer(struct con3270 * cp,int expires)77 static void con3270_set_timer(struct con3270 *cp, int expires)
78 {
79 if (expires == 0)
80 del_timer(&cp->timer);
81 else
82 mod_timer(&cp->timer, jiffies + expires);
83 }
84
85 /*
86 * The status line is the last line of the screen. It shows the string
87 * "console view" in the lower left corner and "Running"/"More..."/"Holding"
88 * in the lower right corner of the screen.
89 */
90 static void
con3270_update_status(struct con3270 * cp)91 con3270_update_status(struct con3270 *cp)
92 {
93 char *str;
94
95 str = (cp->nr_up != 0) ? "History" : "Running";
96 memcpy(cp->status->string + 24, str, 7);
97 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
98 cp->update_flags |= CON_UPDATE_STATUS;
99 }
100
101 static void
con3270_create_status(struct con3270 * cp)102 con3270_create_status(struct con3270 *cp)
103 {
104 static const unsigned char blueprint[] =
105 { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
106 'c','o','n','s','o','l','e',' ','v','i','e','w',
107 TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
108
109 cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
110 /* Copy blueprint to status line */
111 memcpy(cp->status->string, blueprint, sizeof(blueprint));
112 /* Set TO_RA addresses. */
113 raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
114 cp->view.cols * (cp->view.rows - 1));
115 raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
116 cp->view.cols * cp->view.rows - 8);
117 /* Convert strings to ebcdic. */
118 codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
119 codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
120 }
121
122 /*
123 * Set output offsets to 3270 datastream fragment of a console string.
124 */
125 static void
con3270_update_string(struct con3270 * cp,struct string * s,int nr)126 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
127 {
128 if (s->len < 4) {
129 /* This indicates a bug, but printing a warning would
130 * cause a deadlock. */
131 return;
132 }
133 if (s->string[s->len - 4] != TO_RA)
134 return;
135 raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
136 cp->view.cols * (nr + 1));
137 }
138
139 /*
140 * Rebuild update list to print all lines.
141 */
142 static void
con3270_rebuild_update(struct con3270 * cp)143 con3270_rebuild_update(struct con3270 *cp)
144 {
145 struct string *s, *n;
146 int nr;
147
148 /*
149 * Throw away update list and create a new one,
150 * containing all lines that will fit on the screen.
151 */
152 list_for_each_entry_safe(s, n, &cp->update, update)
153 list_del_init(&s->update);
154 nr = cp->view.rows - 2 + cp->nr_up;
155 list_for_each_entry_reverse(s, &cp->lines, list) {
156 if (nr < cp->view.rows - 1)
157 list_add(&s->update, &cp->update);
158 if (--nr < 0)
159 break;
160 }
161 cp->line_nr = 0;
162 cp->update_flags |= CON_UPDATE_LIST;
163 }
164
165 /*
166 * Alloc string for size bytes. Free strings from history if necessary.
167 */
168 static struct string *
con3270_alloc_string(struct con3270 * cp,size_t size)169 con3270_alloc_string(struct con3270 *cp, size_t size)
170 {
171 struct string *s, *n;
172
173 s = alloc_string(&cp->freemem, size);
174 if (s)
175 return s;
176 list_for_each_entry_safe(s, n, &cp->lines, list) {
177 list_del(&s->list);
178 if (!list_empty(&s->update))
179 list_del(&s->update);
180 cp->nr_lines--;
181 if (free_string(&cp->freemem, s) >= size)
182 break;
183 }
184 s = alloc_string(&cp->freemem, size);
185 BUG_ON(!s);
186 if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
187 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
188 con3270_rebuild_update(cp);
189 con3270_update_status(cp);
190 }
191 return s;
192 }
193
194 /*
195 * Write completion callback.
196 */
197 static void
con3270_write_callback(struct raw3270_request * rq,void * data)198 con3270_write_callback(struct raw3270_request *rq, void *data)
199 {
200 raw3270_request_reset(rq);
201 xchg(&((struct con3270 *) rq->view)->write, rq);
202 }
203
204 /*
205 * Update console display.
206 */
207 static void
con3270_update(struct timer_list * t)208 con3270_update(struct timer_list *t)
209 {
210 struct con3270 *cp = from_timer(cp, t, timer);
211 struct raw3270_request *wrq;
212 char wcc, prolog[6];
213 unsigned long flags;
214 unsigned long updated;
215 struct string *s, *n;
216 int rc;
217
218 if (!auto_update && !raw3270_view_active(&cp->view))
219 return;
220 if (cp->view.dev)
221 raw3270_activate_view(&cp->view);
222
223 wrq = xchg(&cp->write, 0);
224 if (!wrq) {
225 con3270_set_timer(cp, 1);
226 return;
227 }
228
229 spin_lock_irqsave(&cp->view.lock, flags);
230 updated = 0;
231 if (cp->update_flags & CON_UPDATE_ALL) {
232 con3270_rebuild_update(cp);
233 con3270_update_status(cp);
234 cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
235 CON_UPDATE_STATUS;
236 }
237 if (cp->update_flags & CON_UPDATE_ERASE) {
238 /* Use erase write alternate to initialize display. */
239 raw3270_request_set_cmd(wrq, TC_EWRITEA);
240 updated |= CON_UPDATE_ERASE;
241 } else
242 raw3270_request_set_cmd(wrq, TC_WRITE);
243
244 wcc = TW_NONE;
245 raw3270_request_add_data(wrq, &wcc, 1);
246
247 /*
248 * Update status line.
249 */
250 if (cp->update_flags & CON_UPDATE_STATUS)
251 if (raw3270_request_add_data(wrq, cp->status->string,
252 cp->status->len) == 0)
253 updated |= CON_UPDATE_STATUS;
254
255 if (cp->update_flags & CON_UPDATE_LIST) {
256 prolog[0] = TO_SBA;
257 prolog[3] = TO_SA;
258 prolog[4] = TAT_COLOR;
259 prolog[5] = TAC_TURQ;
260 raw3270_buffer_address(cp->view.dev, prolog + 1,
261 cp->view.cols * cp->line_nr);
262 raw3270_request_add_data(wrq, prolog, 6);
263 /* Write strings in the update list to the screen. */
264 list_for_each_entry_safe(s, n, &cp->update, update) {
265 if (s != cp->cline)
266 con3270_update_string(cp, s, cp->line_nr);
267 if (raw3270_request_add_data(wrq, s->string,
268 s->len) != 0)
269 break;
270 list_del_init(&s->update);
271 if (s != cp->cline)
272 cp->line_nr++;
273 }
274 if (list_empty(&cp->update))
275 updated |= CON_UPDATE_LIST;
276 }
277 wrq->callback = con3270_write_callback;
278 rc = raw3270_start(&cp->view, wrq);
279 if (rc == 0) {
280 cp->update_flags &= ~updated;
281 if (cp->update_flags)
282 con3270_set_timer(cp, 1);
283 } else {
284 raw3270_request_reset(wrq);
285 xchg(&cp->write, wrq);
286 }
287 spin_unlock_irqrestore(&cp->view.lock, flags);
288 }
289
290 /*
291 * Read tasklet.
292 */
293 static void
con3270_read_tasklet(struct raw3270_request * rrq)294 con3270_read_tasklet(struct raw3270_request *rrq)
295 {
296 static char kreset_data = TW_KR;
297 struct con3270 *cp;
298 unsigned long flags;
299 int nr_up, deactivate;
300
301 cp = (struct con3270 *) rrq->view;
302 spin_lock_irqsave(&cp->view.lock, flags);
303 nr_up = cp->nr_up;
304 deactivate = 0;
305 /* Check aid byte. */
306 switch (cp->input->string[0]) {
307 case 0x7d: /* enter: jump to bottom. */
308 nr_up = 0;
309 break;
310 case 0xf3: /* PF3: deactivate the console view. */
311 deactivate = 1;
312 break;
313 case 0x6d: /* clear: start from scratch. */
314 cp->update_flags = CON_UPDATE_ALL;
315 con3270_set_timer(cp, 1);
316 break;
317 case 0xf7: /* PF7: do a page up in the console log. */
318 nr_up += cp->view.rows - 2;
319 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
320 nr_up = cp->nr_lines - cp->view.rows + 1;
321 if (nr_up < 0)
322 nr_up = 0;
323 }
324 break;
325 case 0xf8: /* PF8: do a page down in the console log. */
326 nr_up -= cp->view.rows - 2;
327 if (nr_up < 0)
328 nr_up = 0;
329 break;
330 }
331 if (nr_up != cp->nr_up) {
332 cp->nr_up = nr_up;
333 con3270_rebuild_update(cp);
334 con3270_update_status(cp);
335 con3270_set_timer(cp, 1);
336 }
337 spin_unlock_irqrestore(&cp->view.lock, flags);
338
339 /* Start keyboard reset command. */
340 raw3270_request_reset(cp->kreset);
341 raw3270_request_set_cmd(cp->kreset, TC_WRITE);
342 raw3270_request_add_data(cp->kreset, &kreset_data, 1);
343 raw3270_start(&cp->view, cp->kreset);
344
345 if (deactivate)
346 raw3270_deactivate_view(&cp->view);
347
348 raw3270_request_reset(rrq);
349 xchg(&cp->read, rrq);
350 raw3270_put_view(&cp->view);
351 }
352
353 /*
354 * Read request completion callback.
355 */
356 static void
con3270_read_callback(struct raw3270_request * rq,void * data)357 con3270_read_callback(struct raw3270_request *rq, void *data)
358 {
359 raw3270_get_view(rq->view);
360 /* Schedule tasklet to pass input to tty. */
361 tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
362 }
363
364 /*
365 * Issue a read request. Called only from interrupt function.
366 */
367 static void
con3270_issue_read(struct con3270 * cp)368 con3270_issue_read(struct con3270 *cp)
369 {
370 struct raw3270_request *rrq;
371 int rc;
372
373 rrq = xchg(&cp->read, 0);
374 if (!rrq)
375 /* Read already scheduled. */
376 return;
377 rrq->callback = con3270_read_callback;
378 rrq->callback_data = cp;
379 raw3270_request_set_cmd(rrq, TC_READMOD);
380 raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
381 /* Issue the read modified request. */
382 rc = raw3270_start_irq(&cp->view, rrq);
383 if (rc)
384 raw3270_request_reset(rrq);
385 }
386
387 /*
388 * Switch to the console view.
389 */
390 static int
con3270_activate(struct raw3270_view * view)391 con3270_activate(struct raw3270_view *view)
392 {
393 struct con3270 *cp;
394
395 cp = (struct con3270 *) view;
396 cp->update_flags = CON_UPDATE_ALL;
397 con3270_set_timer(cp, 1);
398 return 0;
399 }
400
401 static void
con3270_deactivate(struct raw3270_view * view)402 con3270_deactivate(struct raw3270_view *view)
403 {
404 struct con3270 *cp;
405
406 cp = (struct con3270 *) view;
407 del_timer(&cp->timer);
408 }
409
410 static void
con3270_irq(struct con3270 * cp,struct raw3270_request * rq,struct irb * irb)411 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
412 {
413 /* Handle ATTN. Schedule tasklet to read aid. */
414 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
415 con3270_issue_read(cp);
416
417 if (rq) {
418 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
419 rq->rc = -EIO;
420 else
421 /* Normal end. Copy residual count. */
422 rq->rescnt = irb->scsw.cmd.count;
423 } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
424 /* Interrupt without an outstanding request -> update all */
425 cp->update_flags = CON_UPDATE_ALL;
426 con3270_set_timer(cp, 1);
427 }
428 }
429
430 /* Console view to a 3270 device. */
431 static struct raw3270_fn con3270_fn = {
432 .activate = con3270_activate,
433 .deactivate = con3270_deactivate,
434 .intv = (void *) con3270_irq
435 };
436
437 static inline void
con3270_cline_add(struct con3270 * cp)438 con3270_cline_add(struct con3270 *cp)
439 {
440 if (!list_empty(&cp->cline->list))
441 /* Already added. */
442 return;
443 list_add_tail(&cp->cline->list, &cp->lines);
444 cp->nr_lines++;
445 con3270_rebuild_update(cp);
446 }
447
448 static inline void
con3270_cline_insert(struct con3270 * cp,unsigned char c)449 con3270_cline_insert(struct con3270 *cp, unsigned char c)
450 {
451 cp->cline->string[cp->cline->len++] =
452 cp->view.ascebc[(c < ' ') ? ' ' : c];
453 if (list_empty(&cp->cline->update)) {
454 list_add_tail(&cp->cline->update, &cp->update);
455 cp->update_flags |= CON_UPDATE_LIST;
456 }
457 }
458
459 static inline void
con3270_cline_end(struct con3270 * cp)460 con3270_cline_end(struct con3270 *cp)
461 {
462 struct string *s;
463 unsigned int size;
464
465 /* Copy cline. */
466 size = (cp->cline->len < cp->view.cols - 5) ?
467 cp->cline->len + 4 : cp->view.cols;
468 s = con3270_alloc_string(cp, size);
469 memcpy(s->string, cp->cline->string, cp->cline->len);
470 if (cp->cline->len < cp->view.cols - 5) {
471 s->string[s->len - 4] = TO_RA;
472 s->string[s->len - 1] = 0;
473 } else {
474 while (--size >= cp->cline->len)
475 s->string[size] = cp->view.ascebc[' '];
476 }
477 /* Replace cline with allocated line s and reset cline. */
478 list_add(&s->list, &cp->cline->list);
479 list_del_init(&cp->cline->list);
480 if (!list_empty(&cp->cline->update)) {
481 list_add(&s->update, &cp->cline->update);
482 list_del_init(&cp->cline->update);
483 }
484 cp->cline->len = 0;
485 }
486
487 /*
488 * Write a string to the 3270 console
489 */
490 static void
con3270_write(struct console * co,const char * str,unsigned int count)491 con3270_write(struct console *co, const char *str, unsigned int count)
492 {
493 struct con3270 *cp;
494 unsigned long flags;
495 unsigned char c;
496
497 cp = condev;
498 spin_lock_irqsave(&cp->view.lock, flags);
499 while (count-- > 0) {
500 c = *str++;
501 if (cp->cline->len == 0)
502 con3270_cline_add(cp);
503 if (c != '\n')
504 con3270_cline_insert(cp, c);
505 if (c == '\n' || cp->cline->len >= cp->view.cols)
506 con3270_cline_end(cp);
507 }
508 /* Setup timer to output current console buffer after 1/10 second */
509 cp->nr_up = 0;
510 if (cp->view.dev && !timer_pending(&cp->timer))
511 con3270_set_timer(cp, HZ/10);
512 spin_unlock_irqrestore(&cp->view.lock,flags);
513 }
514
515 static struct tty_driver *
con3270_device(struct console * c,int * index)516 con3270_device(struct console *c, int *index)
517 {
518 *index = c->index;
519 return tty3270_driver;
520 }
521
522 /*
523 * Wait for end of write request.
524 */
525 static void
con3270_wait_write(struct con3270 * cp)526 con3270_wait_write(struct con3270 *cp)
527 {
528 while (!cp->write) {
529 raw3270_wait_cons_dev(cp->view.dev);
530 barrier();
531 }
532 }
533
534 /*
535 * panic() calls con3270_flush through a panic_notifier
536 * before the system enters a disabled, endless loop.
537 */
538 static void
con3270_flush(void)539 con3270_flush(void)
540 {
541 struct con3270 *cp;
542 unsigned long flags;
543
544 cp = condev;
545 if (!cp->view.dev)
546 return;
547 raw3270_pm_unfreeze(&cp->view);
548 raw3270_activate_view(&cp->view);
549 spin_lock_irqsave(&cp->view.lock, flags);
550 con3270_wait_write(cp);
551 cp->nr_up = 0;
552 con3270_rebuild_update(cp);
553 con3270_update_status(cp);
554 while (cp->update_flags != 0) {
555 spin_unlock_irqrestore(&cp->view.lock, flags);
556 con3270_update(&cp->timer);
557 spin_lock_irqsave(&cp->view.lock, flags);
558 con3270_wait_write(cp);
559 }
560 spin_unlock_irqrestore(&cp->view.lock, flags);
561 }
562
con3270_notify(struct notifier_block * self,unsigned long event,void * data)563 static int con3270_notify(struct notifier_block *self,
564 unsigned long event, void *data)
565 {
566 con3270_flush();
567 return NOTIFY_OK;
568 }
569
570 static struct notifier_block on_panic_nb = {
571 .notifier_call = con3270_notify,
572 .priority = 0,
573 };
574
575 static struct notifier_block on_reboot_nb = {
576 .notifier_call = con3270_notify,
577 .priority = 0,
578 };
579
580 /*
581 * The console structure for the 3270 console
582 */
583 static struct console con3270 = {
584 .name = "tty3270",
585 .write = con3270_write,
586 .device = con3270_device,
587 .flags = CON_PRINTBUFFER,
588 };
589
590 /*
591 * 3270 console initialization code called from console_init().
592 */
593 static int __init
con3270_init(void)594 con3270_init(void)
595 {
596 struct raw3270 *rp;
597 void *cbuf;
598 int i;
599
600 /* Check if 3270 is to be the console */
601 if (!CONSOLE_IS_3270)
602 return -ENODEV;
603
604 /* Set the console mode for VM */
605 if (MACHINE_IS_VM) {
606 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
607 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
608 }
609
610 rp = raw3270_setup_console();
611 if (IS_ERR(rp))
612 return PTR_ERR(rp);
613
614 condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
615 if (!condev)
616 return -ENOMEM;
617 condev->view.dev = rp;
618
619 condev->read = raw3270_request_alloc(0);
620 condev->read->callback = con3270_read_callback;
621 condev->read->callback_data = condev;
622 condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE);
623 condev->kreset = raw3270_request_alloc(1);
624
625 INIT_LIST_HEAD(&condev->lines);
626 INIT_LIST_HEAD(&condev->update);
627 timer_setup(&condev->timer, con3270_update, 0);
628 tasklet_init(&condev->readlet,
629 (void (*)(unsigned long)) con3270_read_tasklet,
630 (unsigned long) condev->read);
631
632 raw3270_add_view(&condev->view, &con3270_fn, 1);
633
634 INIT_LIST_HEAD(&condev->freemem);
635 for (i = 0; i < CON3270_STRING_PAGES; i++) {
636 cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
637 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
638 }
639 condev->cline = alloc_string(&condev->freemem, condev->view.cols);
640 condev->cline->len = 0;
641 con3270_create_status(condev);
642 condev->input = alloc_string(&condev->freemem, 80);
643 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
644 register_reboot_notifier(&on_reboot_nb);
645 register_console(&con3270);
646 return 0;
647 }
648
649 console_initcall(con3270_init);
650
