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 */ 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 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 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 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 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 * 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 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 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 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 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 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 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 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 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 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 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 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 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 * 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 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 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 } 562 563 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 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