drivers/s390/char/con3270.c

   1 /*
   2  * IBM/3270 Driver - console view.
   3  *
   4  * Author(s):
   5  *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   6  *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *     Copyright IBM Corp. 2003, 2009
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/console.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/list.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/ccwdev.h>
  21 #include <asm/cio.h>
  22 #include <asm/cpcmd.h>
  23 #include <asm/ebcdic.h>
  24
  25 #include "raw3270.h"
  26 #include "tty3270.h"
  27 #include "ctrlchar.h"
  28
  29 #define CON3270_OUTPUT_BUFFER_SIZE 1024
  30 #define CON3270_STRING_PAGES 4
  31
  32 static struct raw3270_fn con3270_fn;
  33
  34 static bool auto_update = 1;
  35 module_param(auto_update, bool, 0);
  36
  37 /*
  38  * Main 3270 console view data structure.
  39  */
  40 struct con3270 {
  41         struct raw3270_view view;
  42         struct list_head freemem;       /* list of free memory for strings. */
  43
  44         /* Output stuff. */
  45         struct list_head lines;         /* list of lines. */
  46         struct list_head update;        /* list of lines to update. */
  47         int line_nr;                    /* line number for next update. */
  48         int nr_lines;                   /* # lines in list. */
  49         int nr_up;                      /* # lines up in history. */
  50         unsigned long update_flags;     /* Update indication bits. */
  51         struct string *cline;           /* current output line. */
  52         struct string *status;          /* last line of display. */
  53         struct raw3270_request *write;  /* single write request. */
  54         struct timer_list timer;
  55
  56         /* Input stuff. */
  57         struct string *input;           /* input string for read request. */
  58         struct raw3270_request *read;   /* single read request. */
  59         struct raw3270_request *kreset; /* single keyboard reset request. */
  60         struct tasklet_struct readlet;  /* tasklet to issue read request. */
  61 };
  62
  63 static struct con3270 *condev;
  64
  65 /* con3270->update_flags. See con3270_update for details. */
  66 #define CON_UPDATE_ERASE        1       /* Use EWRITEA instead of WRITE. */
  67 #define CON_UPDATE_LIST         2       /* Update lines in tty3270->update. */
  68 #define CON_UPDATE_STATUS       4       /* Update status line. */
  69 #define CON_UPDATE_ALL          8       /* Recreate screen. */
  70
  71 static void con3270_update(struct con3270 *);
  72
  73 /*
  74  * Setup timeout for a device. On timeout trigger an update.
  75  */
  76 static void con3270_set_timer(struct con3270 *cp, int expires)
  77 {
  78         if (expires == 0)
  79                 del_timer(&cp->timer);
  80         else
  81                 mod_timer(&cp->timer, jiffies + expires);
  82 }
  83
  84 /*
  85  * The status line is the last line of the screen. It shows the string
  86  * "console view" in the lower left corner and "Running"/"More..."/"Holding"
  87  * in the lower right corner of the screen.
  88  */
  89 static void
  90 con3270_update_status(struct con3270 *cp)
  91 {
  92         char *str;
  93
  94         str = (cp->nr_up != 0) ? "History" : "Running";
  95         memcpy(cp->status->string + 24, str, 7);
  96         codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
  97         cp->update_flags |= CON_UPDATE_STATUS;
  98 }
  99
 100 static void
 101 con3270_create_status(struct con3270 *cp)
 102 {
 103         static const unsigned char blueprint[] =
 104                 { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN,
 105                   'c','o','n','s','o','l','e',' ','v','i','e','w',
 106                   TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG };
 107
 108         cp->status = alloc_string(&cp->freemem, sizeof(blueprint));
 109         /* Copy blueprint to status line */
 110         memcpy(cp->status->string, blueprint, sizeof(blueprint));
 111         /* Set TO_RA addresses. */
 112         raw3270_buffer_address(cp->view.dev, cp->status->string + 1,
 113                                cp->view.cols * (cp->view.rows - 1));
 114         raw3270_buffer_address(cp->view.dev, cp->status->string + 21,
 115                                cp->view.cols * cp->view.rows - 8);
 116         /* Convert strings to ebcdic. */
 117         codepage_convert(cp->view.ascebc, cp->status->string + 8, 12);
 118         codepage_convert(cp->view.ascebc, cp->status->string + 24, 7);
 119 }
 120
 121 /*
 122  * Set output offsets to 3270 datastream fragment of a console string.
 123  */
 124 static void
 125 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
 126 {
 127         if (s->len >= cp->view.cols - 5)
 128                 return;
 129         raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
 130                                cp->view.cols * (nr + 1));
 131 }
 132
 133 /*
 134  * Rebuild update list to print all lines.
 135  */
 136 static void
 137 con3270_rebuild_update(struct con3270 *cp)
 138 {
 139         struct string *s, *n;
 140         int nr;
 141
 142         /*
 143          * Throw away update list and create a new one,
 144          * containing all lines that will fit on the screen.
 145          */
 146         list_for_each_entry_safe(s, n, &cp->update, update)
 147                 list_del_init(&s->update);
 148         nr = cp->view.rows - 2 + cp->nr_up;
 149         list_for_each_entry_reverse(s, &cp->lines, list) {
 150                 if (nr < cp->view.rows - 1)
 151                         list_add(&s->update, &cp->update);
 152                 if (--nr < 0)
 153                         break;
 154         }
 155         cp->line_nr = 0;
 156         cp->update_flags |= CON_UPDATE_LIST;
 157 }
 158
 159 /*
 160  * Alloc string for size bytes. Free strings from history if necessary.
 161  */
 162 static struct string *
 163 con3270_alloc_string(struct con3270 *cp, size_t size)
 164 {
 165         struct string *s, *n;
 166
 167         s = alloc_string(&cp->freemem, size);
 168         if (s)
 169                 return s;
 170         list_for_each_entry_safe(s, n, &cp->lines, list) {
 171                 list_del(&s->list);
 172                 if (!list_empty(&s->update))
 173                         list_del(&s->update);
 174                 cp->nr_lines--;
 175                 if (free_string(&cp->freemem, s) >= size)
 176                         break;
 177         }
 178         s = alloc_string(&cp->freemem, size);
 179         BUG_ON(!s);
 180         if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
 181                 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
 182                 con3270_rebuild_update(cp);
 183                 con3270_update_status(cp);
 184         }
 185         return s;
 186 }
 187
 188 /*
 189  * Write completion callback.
 190  */
 191 static void
 192 con3270_write_callback(struct raw3270_request *rq, void *data)
 193 {
 194         raw3270_request_reset(rq);
 195         xchg(&((struct con3270 *) rq->view)->write, rq);
 196 }
 197
 198 /*
 199  * Update console display.
 200  */
 201 static void
 202 con3270_update(struct con3270 *cp)
 203 {
 204         struct raw3270_request *wrq;
 205         char wcc, prolog[6];
 206         unsigned long flags;
 207         unsigned long updated;
 208         struct string *s, *n;
 209         int rc;
 210
 211         if (!auto_update && !raw3270_view_active(&cp->view))
 212                 return;
 213         if (cp->view.dev)
 214                 raw3270_activate_view(&cp->view);
 215
 216         wrq = xchg(&cp->write, 0);
 217         if (!wrq) {
 218                 con3270_set_timer(cp, 1);
 219                 return;
 220         }
 221
 222         spin_lock_irqsave(&cp->view.lock, flags);
 223         updated = 0;
 224         if (cp->update_flags & CON_UPDATE_ALL) {
 225                 con3270_rebuild_update(cp);
 226                 con3270_update_status(cp);
 227                 cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
 228                         CON_UPDATE_STATUS;
 229         }
 230         if (cp->update_flags & CON_UPDATE_ERASE) {
 231                 /* Use erase write alternate to initialize display. */
 232                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 233                 updated |= CON_UPDATE_ERASE;
 234         } else
 235                 raw3270_request_set_cmd(wrq, TC_WRITE);
 236
 237         wcc = TW_NONE;
 238         raw3270_request_add_data(wrq, &wcc, 1);
 239
 240         /*
 241          * Update status line.
 242          */
 243         if (cp->update_flags & CON_UPDATE_STATUS)
 244                 if (raw3270_request_add_data(wrq, cp->status->string,
 245                                              cp->status->len) == 0)
 246                         updated |= CON_UPDATE_STATUS;
 247
 248         if (cp->update_flags & CON_UPDATE_LIST) {
 249                 prolog[0] = TO_SBA;
 250                 prolog[3] = TO_SA;
 251                 prolog[4] = TAT_COLOR;
 252                 prolog[5] = TAC_TURQ;
 253                 raw3270_buffer_address(cp->view.dev, prolog + 1,
 254                                        cp->view.cols * cp->line_nr);
 255                 raw3270_request_add_data(wrq, prolog, 6);
 256                 /* Write strings in the update list to the screen. */
 257                 list_for_each_entry_safe(s, n, &cp->update, update) {
 258                         if (s != cp->cline)
 259                                 con3270_update_string(cp, s, cp->line_nr);
 260                         if (raw3270_request_add_data(wrq, s->string,
 261                                                      s->len) != 0)
 262                                 break;
 263                         list_del_init(&s->update);
 264                         if (s != cp->cline)
 265                                 cp->line_nr++;
 266                 }
 267                 if (list_empty(&cp->update))
 268                         updated |= CON_UPDATE_LIST;
 269         }
 270         wrq->callback = con3270_write_callback;
 271         rc = raw3270_start(&cp->view, wrq);
 272         if (rc == 0) {
 273                 cp->update_flags &= ~updated;
 274                 if (cp->update_flags)
 275                         con3270_set_timer(cp, 1);
 276         } else {
 277                 raw3270_request_reset(wrq);
 278                 xchg(&cp->write, wrq);
 279         }
 280         spin_unlock_irqrestore(&cp->view.lock, flags);
 281 }
 282
 283 /*
 284  * Read tasklet.
 285  */
 286 static void
 287 con3270_read_tasklet(struct raw3270_request *rrq)
 288 {
 289         static char kreset_data = TW_KR;
 290         struct con3270 *cp;
 291         unsigned long flags;
 292         int nr_up, deactivate;
 293
 294         cp = (struct con3270 *) rrq->view;
 295         spin_lock_irqsave(&cp->view.lock, flags);
 296         nr_up = cp->nr_up;
 297         deactivate = 0;
 298         /* Check aid byte. */
 299         switch (cp->input->string[0]) {
 300         case 0x7d:      /* enter: jump to bottom. */
 301                 nr_up = 0;
 302                 break;
 303         case 0xf3:      /* PF3: deactivate the console view. */
 304                 deactivate = 1;
 305                 break;
 306         case 0x6d:      /* clear: start from scratch. */
 307                 cp->update_flags = CON_UPDATE_ALL;
 308                 con3270_set_timer(cp, 1);
 309                 break;
 310         case 0xf7:      /* PF7: do a page up in the console log. */
 311                 nr_up += cp->view.rows - 2;
 312                 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
 313                         nr_up = cp->nr_lines - cp->view.rows + 1;
 314                         if (nr_up < 0)
 315                                 nr_up = 0;
 316                 }
 317                 break;
 318         case 0xf8:      /* PF8: do a page down in the console log. */
 319                 nr_up -= cp->view.rows - 2;
 320                 if (nr_up < 0)
 321                         nr_up = 0;
 322                 break;
 323         }
 324         if (nr_up != cp->nr_up) {
 325                 cp->nr_up = nr_up;
 326                 con3270_rebuild_update(cp);
 327                 con3270_update_status(cp);
 328                 con3270_set_timer(cp, 1);
 329         }
 330         spin_unlock_irqrestore(&cp->view.lock, flags);
 331
 332         /* Start keyboard reset command. */
 333         raw3270_request_reset(cp->kreset);
 334         raw3270_request_set_cmd(cp->kreset, TC_WRITE);
 335         raw3270_request_add_data(cp->kreset, &kreset_data, 1);
 336         raw3270_start(&cp->view, cp->kreset);
 337
 338         if (deactivate)
 339                 raw3270_deactivate_view(&cp->view);
 340
 341         raw3270_request_reset(rrq);
 342         xchg(&cp->read, rrq);
 343         raw3270_put_view(&cp->view);
 344 }
 345
 346 /*
 347  * Read request completion callback.
 348  */
 349 static void
 350 con3270_read_callback(struct raw3270_request *rq, void *data)
 351 {
 352         raw3270_get_view(rq->view);
 353         /* Schedule tasklet to pass input to tty. */
 354         tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
 355 }
 356
 357 /*
 358  * Issue a read request. Called only from interrupt function.
 359  */
 360 static void
 361 con3270_issue_read(struct con3270 *cp)
 362 {
 363         struct raw3270_request *rrq;
 364         int rc;
 365
 366         rrq = xchg(&cp->read, 0);
 367         if (!rrq)
 368                 /* Read already scheduled. */
 369                 return;
 370         rrq->callback = con3270_read_callback;
 371         rrq->callback_data = cp;
 372         raw3270_request_set_cmd(rrq, TC_READMOD);
 373         raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
 374         /* Issue the read modified request. */
 375         rc = raw3270_start_irq(&cp->view, rrq);
 376         if (rc)
 377                 raw3270_request_reset(rrq);
 378 }
 379
 380 /*
 381  * Switch to the console view.
 382  */
 383 static int
 384 con3270_activate(struct raw3270_view *view)
 385 {
 386         struct con3270 *cp;
 387
 388         cp = (struct con3270 *) view;
 389         cp->update_flags = CON_UPDATE_ALL;
 390         con3270_set_timer(cp, 1);
 391         return 0;
 392 }
 393
 394 static void
 395 con3270_deactivate(struct raw3270_view *view)
 396 {
 397         struct con3270 *cp;
 398
 399         cp = (struct con3270 *) view;
 400         del_timer(&cp->timer);
 401 }
 402
 403 static int
 404 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
 405 {
 406         /* Handle ATTN. Schedule tasklet to read aid. */
 407         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
 408                 con3270_issue_read(cp);
 409
 410         if (rq) {
 411                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 412                         rq->rc = -EIO;
 413                 else
 414                         /* Normal end. Copy residual count. */
 415                         rq->rescnt = irb->scsw.cmd.count;
 416         } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 417                 /* Interrupt without an outstanding request -> update all */
 418                 cp->update_flags = CON_UPDATE_ALL;
 419                 con3270_set_timer(cp, 1);
 420         }
 421         return RAW3270_IO_DONE;
 422 }
 423
 424 /* Console view to a 3270 device. */
 425 static struct raw3270_fn con3270_fn = {
 426         .activate = con3270_activate,
 427         .deactivate = con3270_deactivate,
 428         .intv = (void *) con3270_irq
 429 };
 430
 431 static inline void
 432 con3270_cline_add(struct con3270 *cp)
 433 {
 434         if (!list_empty(&cp->cline->list))
 435                 /* Already added. */
 436                 return;
 437         list_add_tail(&cp->cline->list, &cp->lines);
 438         cp->nr_lines++;
 439         con3270_rebuild_update(cp);
 440 }
 441
 442 static inline void
 443 con3270_cline_insert(struct con3270 *cp, unsigned char c)
 444 {
 445         cp->cline->string[cp->cline->len++] =
 446                 cp->view.ascebc[(c < ' ') ? ' ' : c];
 447         if (list_empty(&cp->cline->update)) {
 448                 list_add_tail(&cp->cline->update, &cp->update);
 449                 cp->update_flags |= CON_UPDATE_LIST;
 450         }
 451 }
 452
 453 static inline void
 454 con3270_cline_end(struct con3270 *cp)
 455 {
 456         struct string *s;
 457         unsigned int size;
 458
 459         /* Copy cline. */
 460         size = (cp->cline->len < cp->view.cols - 5) ?
 461                 cp->cline->len + 4 : cp->view.cols;
 462         s = con3270_alloc_string(cp, size);
 463         memcpy(s->string, cp->cline->string, cp->cline->len);
 464         if (s->len < cp->view.cols - 5) {
 465                 s->string[s->len - 4] = TO_RA;
 466                 s->string[s->len - 1] = 0;
 467         } else {
 468                 while (--size > cp->cline->len)
 469                         s->string[size] = cp->view.ascebc[' '];
 470         }
 471         /* Replace cline with allocated line s and reset cline. */
 472         list_add(&s->list, &cp->cline->list);
 473         list_del_init(&cp->cline->list);
 474         if (!list_empty(&cp->cline->update)) {
 475                 list_add(&s->update, &cp->cline->update);
 476                 list_del_init(&cp->cline->update);
 477         }
 478         cp->cline->len = 0;
 479 }
 480
 481 /*
 482  * Write a string to the 3270 console
 483  */
 484 static void
 485 con3270_write(struct console *co, const char *str, unsigned int count)
 486 {
 487         struct con3270 *cp;
 488         unsigned long flags;
 489         unsigned char c;
 490
 491         cp = condev;
 492         spin_lock_irqsave(&cp->view.lock, flags);
 493         while (count-- > 0) {
 494                 c = *str++;
 495                 if (cp->cline->len == 0)
 496                         con3270_cline_add(cp);
 497                 if (c != '\n')
 498                         con3270_cline_insert(cp, c);
 499                 if (c == '\n' || cp->cline->len >= cp->view.cols)
 500                         con3270_cline_end(cp);
 501         }
 502         /* Setup timer to output current console buffer after 1/10 second */
 503         cp->nr_up = 0;
 504         if (cp->view.dev && !timer_pending(&cp->timer))
 505                 con3270_set_timer(cp, HZ/10);
 506         spin_unlock_irqrestore(&cp->view.lock,flags);
 507 }
 508
 509 static struct tty_driver *
 510 con3270_device(struct console *c, int *index)
 511 {
 512         *index = c->index;
 513         return tty3270_driver;
 514 }
 515
 516 /*
 517  * Wait for end of write request.
 518  */
 519 static void
 520 con3270_wait_write(struct con3270 *cp)
 521 {
 522         while (!cp->write) {
 523                 raw3270_wait_cons_dev(cp->view.dev);
 524                 barrier();
 525         }
 526 }
 527
 528 /*
 529  * panic() calls con3270_flush through a panic_notifier
 530  * before the system enters a disabled, endless loop.
 531  */
 532 static void
 533 con3270_flush(void)
 534 {
 535         struct con3270 *cp;
 536         unsigned long flags;
 537
 538         cp = condev;
 539         if (!cp->view.dev)
 540                 return;
 541         raw3270_pm_unfreeze(&cp->view);
 542         raw3270_activate_view(&cp->view);
 543         spin_lock_irqsave(&cp->view.lock, flags);
 544         con3270_wait_write(cp);
 545         cp->nr_up = 0;
 546         con3270_rebuild_update(cp);
 547         con3270_update_status(cp);
 548         while (cp->update_flags != 0) {
 549                 spin_unlock_irqrestore(&cp->view.lock, flags);
 550                 con3270_update(cp);
 551                 spin_lock_irqsave(&cp->view.lock, flags);
 552                 con3270_wait_write(cp);
 553         }
 554         spin_unlock_irqrestore(&cp->view.lock, flags);
 555 }
 556
 557 static int con3270_notify(struct notifier_block *self,
 558                           unsigned long event, void *data)
 559 {
 560         con3270_flush();
 561         return NOTIFY_OK;
 562 }
 563
 564 static struct notifier_block on_panic_nb = {
 565         .notifier_call = con3270_notify,
 566         .priority = 0,
 567 };
 568
 569 static struct notifier_block on_reboot_nb = {
 570         .notifier_call = con3270_notify,
 571         .priority = 0,
 572 };
 573
 574 /*
 575  *  The console structure for the 3270 console
 576  */
 577 static struct console con3270 = {
 578         .name    = "tty3270",
 579         .write   = con3270_write,
 580         .device  = con3270_device,
 581         .flags   = CON_PRINTBUFFER,
 582 };
 583
 584 /*
 585  * 3270 console initialization code called from console_init().
 586  */
 587 static int __init
 588 con3270_init(void)
 589 {
 590         struct raw3270 *rp;
 591         void *cbuf;
 592         int i;
 593
 594         /* Check if 3270 is to be the console */
 595         if (!CONSOLE_IS_3270)
 596                 return -ENODEV;
 597
 598         /* Set the console mode for VM */
 599         if (MACHINE_IS_VM) {
 600                 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
 601                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 602         }
 603
 604         rp = raw3270_setup_console();
 605         if (IS_ERR(rp))
 606                 return PTR_ERR(rp);
 607
 608         condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
 609         if (!condev)
 610                 return -ENOMEM;
 611         condev->view.dev = rp;
 612
 613         condev->read = raw3270_request_alloc(0);
 614         condev->read->callback = con3270_read_callback;
 615         condev->read->callback_data = condev;
 616         condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE);
 617         condev->kreset = raw3270_request_alloc(1);
 618
 619         INIT_LIST_HEAD(&condev->lines);
 620         INIT_LIST_HEAD(&condev->update);
 621         setup_timer(&condev->timer, (void (*)(unsigned long)) con3270_update,
 622                     (unsigned long) condev);
 623         tasklet_init(&condev->readlet,
 624                      (void (*)(unsigned long)) con3270_read_tasklet,
 625                      (unsigned long) condev->read);
 626
 627         raw3270_add_view(&condev->view, &con3270_fn, 1);
 628
 629         INIT_LIST_HEAD(&condev->freemem);
 630         for (i = 0; i < CON3270_STRING_PAGES; i++) {
 631                 cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 632                 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
 633         }
 634         condev->cline = alloc_string(&condev->freemem, condev->view.cols);
 635         condev->cline->len = 0;
 636         con3270_create_status(condev);
 637         condev->input = alloc_string(&condev->freemem, 80);
 638         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 639         register_reboot_notifier(&on_reboot_nb);
 640         register_console(&con3270);
 641         return 0;
 642 }
 643
 644 console_initcall(con3270_init);