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 < 4) {
 128                 /* This indicates a bug, but printing a warning would
 129                  * cause a deadlock. */
 130                 return;
 131         }
 132         if (s->string[s->len - 4] != TO_RA)
 133                 return;
 134         raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
 135                                cp->view.cols * (nr + 1));
 136 }
 137
 138 /*
 139  * Rebuild update list to print all lines.
 140  */
 141 static void
 142 con3270_rebuild_update(struct con3270 *cp)
 143 {
 144         struct string *s, *n;
 145         int nr;
 146
 147         /*
 148          * Throw away update list and create a new one,
 149          * containing all lines that will fit on the screen.
 150          */
 151         list_for_each_entry_safe(s, n, &cp->update, update)
 152                 list_del_init(&s->update);
 153         nr = cp->view.rows - 2 + cp->nr_up;
 154         list_for_each_entry_reverse(s, &cp->lines, list) {
 155                 if (nr < cp->view.rows - 1)
 156                         list_add(&s->update, &cp->update);
 157                 if (--nr < 0)
 158                         break;
 159         }
 160         cp->line_nr = 0;
 161         cp->update_flags |= CON_UPDATE_LIST;
 162 }
 163
 164 /*
 165  * Alloc string for size bytes. Free strings from history if necessary.
 166  */
 167 static struct string *
 168 con3270_alloc_string(struct con3270 *cp, size_t size)
 169 {
 170         struct string *s, *n;
 171
 172         s = alloc_string(&cp->freemem, size);
 173         if (s)
 174                 return s;
 175         list_for_each_entry_safe(s, n, &cp->lines, list) {
 176                 list_del(&s->list);
 177                 if (!list_empty(&s->update))
 178                         list_del(&s->update);
 179                 cp->nr_lines--;
 180                 if (free_string(&cp->freemem, s) >= size)
 181                         break;
 182         }
 183         s = alloc_string(&cp->freemem, size);
 184         BUG_ON(!s);
 185         if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) {
 186                 cp->nr_up = cp->nr_lines - cp->view.rows + 1;
 187                 con3270_rebuild_update(cp);
 188                 con3270_update_status(cp);
 189         }
 190         return s;
 191 }
 192
 193 /*
 194  * Write completion callback.
 195  */
 196 static void
 197 con3270_write_callback(struct raw3270_request *rq, void *data)
 198 {
 199         raw3270_request_reset(rq);
 200         xchg(&((struct con3270 *) rq->view)->write, rq);
 201 }
 202
 203 /*
 204  * Update console display.
 205  */
 206 static void
 207 con3270_update(struct con3270 *cp)
 208 {
 209         struct raw3270_request *wrq;
 210         char wcc, prolog[6];
 211         unsigned long flags;
 212         unsigned long updated;
 213         struct string *s, *n;
 214         int rc;
 215
 216         if (!auto_update && !raw3270_view_active(&cp->view))
 217                 return;
 218         if (cp->view.dev)
 219                 raw3270_activate_view(&cp->view);
 220
 221         wrq = xchg(&cp->write, 0);
 222         if (!wrq) {
 223                 con3270_set_timer(cp, 1);
 224                 return;
 225         }
 226
 227         spin_lock_irqsave(&cp->view.lock, flags);
 228         updated = 0;
 229         if (cp->update_flags & CON_UPDATE_ALL) {
 230                 con3270_rebuild_update(cp);
 231                 con3270_update_status(cp);
 232                 cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST |
 233                         CON_UPDATE_STATUS;
 234         }
 235         if (cp->update_flags & CON_UPDATE_ERASE) {
 236                 /* Use erase write alternate to initialize display. */
 237                 raw3270_request_set_cmd(wrq, TC_EWRITEA);
 238                 updated |= CON_UPDATE_ERASE;
 239         } else
 240                 raw3270_request_set_cmd(wrq, TC_WRITE);
 241
 242         wcc = TW_NONE;
 243         raw3270_request_add_data(wrq, &wcc, 1);
 244
 245         /*
 246          * Update status line.
 247          */
 248         if (cp->update_flags & CON_UPDATE_STATUS)
 249                 if (raw3270_request_add_data(wrq, cp->status->string,
 250                                              cp->status->len) == 0)
 251                         updated |= CON_UPDATE_STATUS;
 252
 253         if (cp->update_flags & CON_UPDATE_LIST) {
 254                 prolog[0] = TO_SBA;
 255                 prolog[3] = TO_SA;
 256                 prolog[4] = TAT_COLOR;
 257                 prolog[5] = TAC_TURQ;
 258                 raw3270_buffer_address(cp->view.dev, prolog + 1,
 259                                        cp->view.cols * cp->line_nr);
 260                 raw3270_request_add_data(wrq, prolog, 6);
 261                 /* Write strings in the update list to the screen. */
 262                 list_for_each_entry_safe(s, n, &cp->update, update) {
 263                         if (s != cp->cline)
 264                                 con3270_update_string(cp, s, cp->line_nr);
 265                         if (raw3270_request_add_data(wrq, s->string,
 266                                                      s->len) != 0)
 267                                 break;
 268                         list_del_init(&s->update);
 269                         if (s != cp->cline)
 270                                 cp->line_nr++;
 271                 }
 272                 if (list_empty(&cp->update))
 273                         updated |= CON_UPDATE_LIST;
 274         }
 275         wrq->callback = con3270_write_callback;
 276         rc = raw3270_start(&cp->view, wrq);
 277         if (rc == 0) {
 278                 cp->update_flags &= ~updated;
 279                 if (cp->update_flags)
 280                         con3270_set_timer(cp, 1);
 281         } else {
 282                 raw3270_request_reset(wrq);
 283                 xchg(&cp->write, wrq);
 284         }
 285         spin_unlock_irqrestore(&cp->view.lock, flags);
 286 }
 287
 288 /*
 289  * Read tasklet.
 290  */
 291 static void
 292 con3270_read_tasklet(struct raw3270_request *rrq)
 293 {
 294         static char kreset_data = TW_KR;
 295         struct con3270 *cp;
 296         unsigned long flags;
 297         int nr_up, deactivate;
 298
 299         cp = (struct con3270 *) rrq->view;
 300         spin_lock_irqsave(&cp->view.lock, flags);
 301         nr_up = cp->nr_up;
 302         deactivate = 0;
 303         /* Check aid byte. */
 304         switch (cp->input->string[0]) {
 305         case 0x7d:      /* enter: jump to bottom. */
 306                 nr_up = 0;
 307                 break;
 308         case 0xf3:      /* PF3: deactivate the console view. */
 309                 deactivate = 1;
 310                 break;
 311         case 0x6d:      /* clear: start from scratch. */
 312                 cp->update_flags = CON_UPDATE_ALL;
 313                 con3270_set_timer(cp, 1);
 314                 break;
 315         case 0xf7:      /* PF7: do a page up in the console log. */
 316                 nr_up += cp->view.rows - 2;
 317                 if (nr_up + cp->view.rows - 1 > cp->nr_lines) {
 318                         nr_up = cp->nr_lines - cp->view.rows + 1;
 319                         if (nr_up < 0)
 320                                 nr_up = 0;
 321                 }
 322                 break;
 323         case 0xf8:      /* PF8: do a page down in the console log. */
 324                 nr_up -= cp->view.rows - 2;
 325                 if (nr_up < 0)
 326                         nr_up = 0;
 327                 break;
 328         }
 329         if (nr_up != cp->nr_up) {
 330                 cp->nr_up = nr_up;
 331                 con3270_rebuild_update(cp);
 332                 con3270_update_status(cp);
 333                 con3270_set_timer(cp, 1);
 334         }
 335         spin_unlock_irqrestore(&cp->view.lock, flags);
 336
 337         /* Start keyboard reset command. */
 338         raw3270_request_reset(cp->kreset);
 339         raw3270_request_set_cmd(cp->kreset, TC_WRITE);
 340         raw3270_request_add_data(cp->kreset, &kreset_data, 1);
 341         raw3270_start(&cp->view, cp->kreset);
 342
 343         if (deactivate)
 344                 raw3270_deactivate_view(&cp->view);
 345
 346         raw3270_request_reset(rrq);
 347         xchg(&cp->read, rrq);
 348         raw3270_put_view(&cp->view);
 349 }
 350
 351 /*
 352  * Read request completion callback.
 353  */
 354 static void
 355 con3270_read_callback(struct raw3270_request *rq, void *data)
 356 {
 357         raw3270_get_view(rq->view);
 358         /* Schedule tasklet to pass input to tty. */
 359         tasklet_schedule(&((struct con3270 *) rq->view)->readlet);
 360 }
 361
 362 /*
 363  * Issue a read request. Called only from interrupt function.
 364  */
 365 static void
 366 con3270_issue_read(struct con3270 *cp)
 367 {
 368         struct raw3270_request *rrq;
 369         int rc;
 370
 371         rrq = xchg(&cp->read, 0);
 372         if (!rrq)
 373                 /* Read already scheduled. */
 374                 return;
 375         rrq->callback = con3270_read_callback;
 376         rrq->callback_data = cp;
 377         raw3270_request_set_cmd(rrq, TC_READMOD);
 378         raw3270_request_set_data(rrq, cp->input->string, cp->input->len);
 379         /* Issue the read modified request. */
 380         rc = raw3270_start_irq(&cp->view, rrq);
 381         if (rc)
 382                 raw3270_request_reset(rrq);
 383 }
 384
 385 /*
 386  * Switch to the console view.
 387  */
 388 static int
 389 con3270_activate(struct raw3270_view *view)
 390 {
 391         struct con3270 *cp;
 392
 393         cp = (struct con3270 *) view;
 394         cp->update_flags = CON_UPDATE_ALL;
 395         con3270_set_timer(cp, 1);
 396         return 0;
 397 }
 398
 399 static void
 400 con3270_deactivate(struct raw3270_view *view)
 401 {
 402         struct con3270 *cp;
 403
 404         cp = (struct con3270 *) view;
 405         del_timer(&cp->timer);
 406 }
 407
 408 static void
 409 con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb)
 410 {
 411         /* Handle ATTN. Schedule tasklet to read aid. */
 412         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
 413                 con3270_issue_read(cp);
 414
 415         if (rq) {
 416                 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 417                         rq->rc = -EIO;
 418                 else
 419                         /* Normal end. Copy residual count. */
 420                         rq->rescnt = irb->scsw.cmd.count;
 421         } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 422                 /* Interrupt without an outstanding request -> update all */
 423                 cp->update_flags = CON_UPDATE_ALL;
 424                 con3270_set_timer(cp, 1);
 425         }
 426 }
 427
 428 /* Console view to a 3270 device. */
 429 static struct raw3270_fn con3270_fn = {
 430         .activate = con3270_activate,
 431         .deactivate = con3270_deactivate,
 432         .intv = (void *) con3270_irq
 433 };
 434
 435 static inline void
 436 con3270_cline_add(struct con3270 *cp)
 437 {
 438         if (!list_empty(&cp->cline->list))
 439                 /* Already added. */
 440                 return;
 441         list_add_tail(&cp->cline->list, &cp->lines);
 442         cp->nr_lines++;
 443         con3270_rebuild_update(cp);
 444 }
 445
 446 static inline void
 447 con3270_cline_insert(struct con3270 *cp, unsigned char c)
 448 {
 449         cp->cline->string[cp->cline->len++] =
 450                 cp->view.ascebc[(c < ' ') ? ' ' : c];
 451         if (list_empty(&cp->cline->update)) {
 452                 list_add_tail(&cp->cline->update, &cp->update);
 453                 cp->update_flags |= CON_UPDATE_LIST;
 454         }
 455 }
 456
 457 static inline void
 458 con3270_cline_end(struct con3270 *cp)
 459 {
 460         struct string *s;
 461         unsigned int size;
 462
 463         /* Copy cline. */
 464         size = (cp->cline->len < cp->view.cols - 5) ?
 465                 cp->cline->len + 4 : cp->view.cols;
 466         s = con3270_alloc_string(cp, size);
 467         memcpy(s->string, cp->cline->string, cp->cline->len);
 468         if (cp->cline->len < cp->view.cols - 5) {
 469                 s->string[s->len - 4] = TO_RA;
 470                 s->string[s->len - 1] = 0;
 471         } else {
 472                 while (--size >= cp->cline->len)
 473                         s->string[size] = cp->view.ascebc[' '];
 474         }
 475         /* Replace cline with allocated line s and reset cline. */
 476         list_add(&s->list, &cp->cline->list);
 477         list_del_init(&cp->cline->list);
 478         if (!list_empty(&cp->cline->update)) {
 479                 list_add(&s->update, &cp->cline->update);
 480                 list_del_init(&cp->cline->update);
 481         }
 482         cp->cline->len = 0;
 483 }
 484
 485 /*
 486  * Write a string to the 3270 console
 487  */
 488 static void
 489 con3270_write(struct console *co, const char *str, unsigned int count)
 490 {
 491         struct con3270 *cp;
 492         unsigned long flags;
 493         unsigned char c;
 494
 495         cp = condev;
 496         spin_lock_irqsave(&cp->view.lock, flags);
 497         while (count-- > 0) {
 498                 c = *str++;
 499                 if (cp->cline->len == 0)
 500                         con3270_cline_add(cp);
 501                 if (c != '\n')
 502                         con3270_cline_insert(cp, c);
 503                 if (c == '\n' || cp->cline->len >= cp->view.cols)
 504                         con3270_cline_end(cp);
 505         }
 506         /* Setup timer to output current console buffer after 1/10 second */
 507         cp->nr_up = 0;
 508         if (cp->view.dev && !timer_pending(&cp->timer))
 509                 con3270_set_timer(cp, HZ/10);
 510         spin_unlock_irqrestore(&cp->view.lock,flags);
 511 }
 512
 513 static struct tty_driver *
 514 con3270_device(struct console *c, int *index)
 515 {
 516         *index = c->index;
 517         return tty3270_driver;
 518 }
 519
 520 /*
 521  * Wait for end of write request.
 522  */
 523 static void
 524 con3270_wait_write(struct con3270 *cp)
 525 {
 526         while (!cp->write) {
 527                 raw3270_wait_cons_dev(cp->view.dev);
 528                 barrier();
 529         }
 530 }
 531
 532 /*
 533  * panic() calls con3270_flush through a panic_notifier
 534  * before the system enters a disabled, endless loop.
 535  */
 536 static void
 537 con3270_flush(void)
 538 {
 539         struct con3270 *cp;
 540         unsigned long flags;
 541
 542         cp = condev;
 543         if (!cp->view.dev)
 544                 return;
 545         raw3270_pm_unfreeze(&cp->view);
 546         raw3270_activate_view(&cp->view);
 547         spin_lock_irqsave(&cp->view.lock, flags);
 548         con3270_wait_write(cp);
 549         cp->nr_up = 0;
 550         con3270_rebuild_update(cp);
 551         con3270_update_status(cp);
 552         while (cp->update_flags != 0) {
 553                 spin_unlock_irqrestore(&cp->view.lock, flags);
 554                 con3270_update(cp);
 555                 spin_lock_irqsave(&cp->view.lock, flags);
 556                 con3270_wait_write(cp);
 557         }
 558         spin_unlock_irqrestore(&cp->view.lock, flags);
 559 }
 560
 561 static int con3270_notify(struct notifier_block *self,
 562                           unsigned long event, void *data)
 563 {
 564         con3270_flush();
 565         return NOTIFY_OK;
 566 }
 567
 568 static struct notifier_block on_panic_nb = {
 569         .notifier_call = con3270_notify,
 570         .priority = 0,
 571 };
 572
 573 static struct notifier_block on_reboot_nb = {
 574         .notifier_call = con3270_notify,
 575         .priority = 0,
 576 };
 577
 578 /*
 579  *  The console structure for the 3270 console
 580  */
 581 static struct console con3270 = {
 582         .name    = "tty3270",
 583         .write   = con3270_write,
 584         .device  = con3270_device,
 585         .flags   = CON_PRINTBUFFER,
 586 };
 587
 588 /*
 589  * 3270 console initialization code called from console_init().
 590  */
 591 static int __init
 592 con3270_init(void)
 593 {
 594         struct raw3270 *rp;
 595         void *cbuf;
 596         int i;
 597
 598         /* Check if 3270 is to be the console */
 599         if (!CONSOLE_IS_3270)
 600                 return -ENODEV;
 601
 602         /* Set the console mode for VM */
 603         if (MACHINE_IS_VM) {
 604                 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
 605                 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
 606         }
 607
 608         rp = raw3270_setup_console();
 609         if (IS_ERR(rp))
 610                 return PTR_ERR(rp);
 611
 612         condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA);
 613         if (!condev)
 614                 return -ENOMEM;
 615         condev->view.dev = rp;
 616
 617         condev->read = raw3270_request_alloc(0);
 618         condev->read->callback = con3270_read_callback;
 619         condev->read->callback_data = condev;
 620         condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE);
 621         condev->kreset = raw3270_request_alloc(1);
 622
 623         INIT_LIST_HEAD(&condev->lines);
 624         INIT_LIST_HEAD(&condev->update);
 625         setup_timer(&condev->timer, (void (*)(unsigned long)) con3270_update,
 626                     (unsigned long) condev);
 627         tasklet_init(&condev->readlet,
 628                      (void (*)(unsigned long)) con3270_read_tasklet,
 629                      (unsigned long) condev->read);
 630
 631         raw3270_add_view(&condev->view, &con3270_fn, 1);
 632
 633         INIT_LIST_HEAD(&condev->freemem);
 634         for (i = 0; i < CON3270_STRING_PAGES; i++) {
 635                 cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 636                 add_string_memory(&condev->freemem, cbuf, PAGE_SIZE);
 637         }
 638         condev->cline = alloc_string(&condev->freemem, condev->view.cols);
 639         condev->cline->len = 0;
 640         con3270_create_status(condev);
 641         condev->input = alloc_string(&condev->freemem, 80);
 642         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
 643         register_reboot_notifier(&on_reboot_nb);
 644         register_console(&con3270);
 645         return 0;
 646 }
 647
 648 console_initcall(con3270_init);