1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * IBM/3270 Driver - core functions. 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/err.h> 13 #include <linux/init.h> 14 #include <linux/interrupt.h> 15 #include <linux/list.h> 16 #include <linux/slab.h> 17 #include <linux/types.h> 18 #include <linux/wait.h> 19 20 #include <asm/ccwdev.h> 21 #include <asm/cio.h> 22 #include <asm/ebcdic.h> 23 #include <asm/diag.h> 24 25 #include "raw3270.h" 26 27 #include <linux/major.h> 28 #include <linux/kdev_t.h> 29 #include <linux/device.h> 30 #include <linux/mutex.h> 31 32 struct class *class3270; 33 EXPORT_SYMBOL(class3270); 34 35 /* The main 3270 data structure. */ 36 struct raw3270 { 37 struct list_head list; 38 struct ccw_device *cdev; 39 int minor; 40 41 int model, rows, cols; 42 int old_model, old_rows, old_cols; 43 unsigned int state; 44 unsigned long flags; 45 46 struct list_head req_queue; /* Request queue. */ 47 struct list_head view_list; /* List of available views. */ 48 struct raw3270_view *view; /* Active view. */ 49 50 struct timer_list timer; /* Device timer. */ 51 52 unsigned char *ascebc; /* ascii -> ebcdic table */ 53 54 struct raw3270_view init_view; 55 struct raw3270_request init_reset; 56 struct raw3270_request init_readpart; 57 struct raw3270_request init_readmod; 58 unsigned char init_data[256]; 59 struct work_struct resize_work; 60 }; 61 62 /* raw3270->state */ 63 #define RAW3270_STATE_INIT 0 /* Initial state */ 64 #define RAW3270_STATE_RESET 1 /* Reset command is pending */ 65 #define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */ 66 #define RAW3270_STATE_READMOD 3 /* Read partition is pending */ 67 #define RAW3270_STATE_READY 4 /* Device is usable by views */ 68 69 /* raw3270->flags */ 70 #define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */ 71 #define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */ 72 #define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */ 73 74 /* Semaphore to protect global data of raw3270 (devices, views, etc). */ 75 static DEFINE_MUTEX(raw3270_mutex); 76 77 /* List of 3270 devices. */ 78 static LIST_HEAD(raw3270_devices); 79 80 /* 81 * Flag to indicate if the driver has been registered. Some operations 82 * like waiting for the end of i/o need to be done differently as long 83 * as the kernel is still starting up (console support). 84 */ 85 static int raw3270_registered; 86 87 /* Module parameters */ 88 static bool tubxcorrect; 89 module_param(tubxcorrect, bool, 0); 90 91 /* 92 * Wait queue for device init/delete, view delete. 93 */ 94 DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue); 95 EXPORT_SYMBOL(raw3270_wait_queue); 96 97 static void __raw3270_disconnect(struct raw3270 *rp); 98 99 /* 100 * Encode array for 12 bit 3270 addresses. 101 */ 102 static unsigned char raw3270_ebcgraf[64] = { 103 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 104 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 105 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 106 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 107 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 108 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 109 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 110 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f 111 }; 112 113 static inline int raw3270_state_ready(struct raw3270 *rp) 114 { 115 return rp->state == RAW3270_STATE_READY; 116 } 117 118 void raw3270_buffer_address(struct raw3270 *rp, char *cp, int x, int y) 119 { 120 int addr; 121 122 if (x < 0) 123 x = max_t(int, 0, rp->view->cols + x); 124 if (y < 0) 125 y = max_t(int, 0, rp->view->rows + y); 126 addr = (y * rp->view->cols) + x; 127 if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) { 128 cp[0] = (addr >> 8) & 0x3f; 129 cp[1] = addr & 0xff; 130 } else { 131 cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f]; 132 cp[1] = raw3270_ebcgraf[addr & 0x3f]; 133 } 134 } 135 EXPORT_SYMBOL(raw3270_buffer_address); 136 137 /* 138 * Allocate a new 3270 ccw request 139 */ 140 struct raw3270_request *raw3270_request_alloc(size_t size) 141 { 142 struct raw3270_request *rq; 143 144 /* Allocate request structure */ 145 rq = kzalloc(sizeof(*rq), GFP_KERNEL | GFP_DMA); 146 if (!rq) 147 return ERR_PTR(-ENOMEM); 148 149 /* alloc output buffer. */ 150 if (size > 0) { 151 rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA); 152 if (!rq->buffer) { 153 kfree(rq); 154 return ERR_PTR(-ENOMEM); 155 } 156 } 157 rq->size = size; 158 INIT_LIST_HEAD(&rq->list); 159 160 /* 161 * Setup ccw. 162 */ 163 rq->ccw.cda = __pa(rq->buffer); 164 rq->ccw.flags = CCW_FLAG_SLI; 165 166 return rq; 167 } 168 EXPORT_SYMBOL(raw3270_request_alloc); 169 170 /* 171 * Free 3270 ccw request 172 */ 173 void raw3270_request_free(struct raw3270_request *rq) 174 { 175 kfree(rq->buffer); 176 kfree(rq); 177 } 178 EXPORT_SYMBOL(raw3270_request_free); 179 180 /* 181 * Reset request to initial state. 182 */ 183 int raw3270_request_reset(struct raw3270_request *rq) 184 { 185 if (WARN_ON_ONCE(!list_empty(&rq->list))) 186 return -EBUSY; 187 rq->ccw.cmd_code = 0; 188 rq->ccw.count = 0; 189 rq->ccw.cda = __pa(rq->buffer); 190 rq->ccw.flags = CCW_FLAG_SLI; 191 rq->rescnt = 0; 192 rq->rc = 0; 193 return 0; 194 } 195 EXPORT_SYMBOL(raw3270_request_reset); 196 197 /* 198 * Set command code to ccw of a request. 199 */ 200 void raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd) 201 { 202 rq->ccw.cmd_code = cmd; 203 } 204 EXPORT_SYMBOL(raw3270_request_set_cmd); 205 206 /* 207 * Add data fragment to output buffer. 208 */ 209 int raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size) 210 { 211 if (size + rq->ccw.count > rq->size) 212 return -E2BIG; 213 memcpy(rq->buffer + rq->ccw.count, data, size); 214 rq->ccw.count += size; 215 return 0; 216 } 217 EXPORT_SYMBOL(raw3270_request_add_data); 218 219 /* 220 * Set address/length pair to ccw of a request. 221 */ 222 void raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size) 223 { 224 rq->ccw.cda = __pa(data); 225 rq->ccw.count = size; 226 } 227 EXPORT_SYMBOL(raw3270_request_set_data); 228 229 /* 230 * Set idal buffer to ccw of a request. 231 */ 232 void raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib) 233 { 234 rq->ccw.cda = __pa(ib->data); 235 rq->ccw.count = ib->size; 236 rq->ccw.flags |= CCW_FLAG_IDA; 237 } 238 EXPORT_SYMBOL(raw3270_request_set_idal); 239 240 /* 241 * Add the request to the request queue, try to start it if the 242 * 3270 device is idle. Return without waiting for end of i/o. 243 */ 244 static int __raw3270_start(struct raw3270 *rp, struct raw3270_view *view, 245 struct raw3270_request *rq) 246 { 247 rq->view = view; 248 raw3270_get_view(view); 249 if (list_empty(&rp->req_queue) && 250 !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) { 251 /* No other requests are on the queue. Start this one. */ 252 rq->rc = ccw_device_start(rp->cdev, &rq->ccw, 253 (unsigned long)rq, 0, 0); 254 if (rq->rc) { 255 raw3270_put_view(view); 256 return rq->rc; 257 } 258 } 259 list_add_tail(&rq->list, &rp->req_queue); 260 return 0; 261 } 262 263 int raw3270_view_active(struct raw3270_view *view) 264 { 265 struct raw3270 *rp = view->dev; 266 267 return rp && rp->view == view; 268 } 269 270 int raw3270_start(struct raw3270_view *view, struct raw3270_request *rq) 271 { 272 unsigned long flags; 273 struct raw3270 *rp; 274 int rc; 275 276 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); 277 rp = view->dev; 278 if (!rp || rp->view != view) 279 rc = -EACCES; 280 else if (!raw3270_state_ready(rp)) 281 rc = -EBUSY; 282 else 283 rc = __raw3270_start(rp, view, rq); 284 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); 285 return rc; 286 } 287 EXPORT_SYMBOL(raw3270_start); 288 289 int raw3270_start_request(struct raw3270_view *view, struct raw3270_request *rq, 290 int cmd, void *data, size_t len) 291 { 292 int rc; 293 294 rc = raw3270_request_reset(rq); 295 if (rc) 296 return rc; 297 raw3270_request_set_cmd(rq, cmd); 298 rc = raw3270_request_add_data(rq, data, len); 299 if (rc) 300 return rc; 301 return raw3270_start(view, rq); 302 } 303 EXPORT_SYMBOL(raw3270_start_request); 304 305 int raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq) 306 { 307 struct raw3270 *rp; 308 int rc; 309 310 rp = view->dev; 311 if (!rp || rp->view != view) 312 rc = -EACCES; 313 else if (!raw3270_state_ready(rp)) 314 rc = -EBUSY; 315 else 316 rc = __raw3270_start(rp, view, rq); 317 return rc; 318 } 319 EXPORT_SYMBOL(raw3270_start_locked); 320 321 int raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq) 322 { 323 struct raw3270 *rp; 324 325 rp = view->dev; 326 rq->view = view; 327 raw3270_get_view(view); 328 list_add_tail(&rq->list, &rp->req_queue); 329 return 0; 330 } 331 EXPORT_SYMBOL(raw3270_start_irq); 332 333 /* 334 * 3270 interrupt routine, called from the ccw_device layer 335 */ 336 static void raw3270_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 337 { 338 struct raw3270 *rp; 339 struct raw3270_view *view; 340 struct raw3270_request *rq; 341 342 rp = dev_get_drvdata(&cdev->dev); 343 if (!rp) 344 return; 345 rq = (struct raw3270_request *)intparm; 346 view = rq ? rq->view : rp->view; 347 348 if (!IS_ERR(irb)) { 349 /* Handle CE-DE-UE and subsequent UDE */ 350 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) 351 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags); 352 if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | 353 DEV_STAT_DEV_END | 354 DEV_STAT_UNIT_EXCEP)) 355 set_bit(RAW3270_FLAGS_BUSY, &rp->flags); 356 /* Handle disconnected devices */ 357 if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && 358 (irb->ecw[0] & SNS0_INTERVENTION_REQ)) { 359 set_bit(RAW3270_FLAGS_BUSY, &rp->flags); 360 if (rp->state > RAW3270_STATE_RESET) 361 __raw3270_disconnect(rp); 362 } 363 /* Call interrupt handler of the view */ 364 if (view) 365 view->fn->intv(view, rq, irb); 366 } 367 368 if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) 369 /* Device busy, do not start I/O */ 370 return; 371 372 if (rq && !list_empty(&rq->list)) { 373 /* The request completed, remove from queue and do callback. */ 374 list_del_init(&rq->list); 375 if (rq->callback) 376 rq->callback(rq, rq->callback_data); 377 /* Do put_device for get_device in raw3270_start. */ 378 raw3270_put_view(view); 379 } 380 381 /* 382 * Try to start each request on request queue until one is 383 * started successful. 384 */ 385 while (!list_empty(&rp->req_queue)) { 386 rq = list_entry(rp->req_queue.next, struct raw3270_request, list); 387 rq->rc = ccw_device_start(rp->cdev, &rq->ccw, 388 (unsigned long)rq, 0, 0); 389 if (rq->rc == 0) 390 break; 391 /* Start failed. Remove request and do callback. */ 392 list_del_init(&rq->list); 393 if (rq->callback) 394 rq->callback(rq, rq->callback_data); 395 /* Do put_device for get_device in raw3270_start. */ 396 raw3270_put_view(view); 397 } 398 } 399 400 /* 401 * To determine the size of the 3270 device we need to do: 402 * 1) send a 'read partition' data stream to the device 403 * 2) wait for the attn interrupt that precedes the query reply 404 * 3) do a read modified to get the query reply 405 * To make things worse we have to cope with intervention 406 * required (3270 device switched to 'stand-by') and command 407 * rejects (old devices that can't do 'read partition'). 408 */ 409 struct raw3270_ua { /* Query Reply structure for Usable Area */ 410 struct { /* Usable Area Query Reply Base */ 411 short l; /* Length of this structured field */ 412 char sfid; /* 0x81 if Query Reply */ 413 char qcode; /* 0x81 if Usable Area */ 414 char flags0; 415 char flags1; 416 short w; /* Width of usable area */ 417 short h; /* Heigth of usavle area */ 418 char units; /* 0x00:in; 0x01:mm */ 419 int xr; 420 int yr; 421 char aw; 422 char ah; 423 short buffsz; /* Character buffer size, bytes */ 424 char xmin; 425 char ymin; 426 char xmax; 427 char ymax; 428 } __packed uab; 429 struct { /* Alternate Usable Area Self-Defining Parameter */ 430 char l; /* Length of this Self-Defining Parm */ 431 char sdpid; /* 0x02 if Alternate Usable Area */ 432 char res; 433 char auaid; /* 0x01 is Id for the A U A */ 434 short wauai; /* Width of AUAi */ 435 short hauai; /* Height of AUAi */ 436 char auaunits; /* 0x00:in, 0x01:mm */ 437 int auaxr; 438 int auayr; 439 char awauai; 440 char ahauai; 441 } __packed aua; 442 } __packed; 443 444 static void raw3270_size_device_vm(struct raw3270 *rp) 445 { 446 int rc, model; 447 struct ccw_dev_id dev_id; 448 struct diag210 diag_data; 449 struct diag8c diag8c_data; 450 451 ccw_device_get_id(rp->cdev, &dev_id); 452 rc = diag8c(&diag8c_data, &dev_id); 453 if (!rc) { 454 rp->model = 2; 455 rp->rows = diag8c_data.height; 456 rp->cols = diag8c_data.width; 457 if (diag8c_data.flags & 1) 458 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags); 459 return; 460 } 461 462 diag_data.vrdcdvno = dev_id.devno; 463 diag_data.vrdclen = sizeof(struct diag210); 464 rc = diag210(&diag_data); 465 model = diag_data.vrdccrmd; 466 /* Use default model 2 if the size could not be detected */ 467 if (rc || model < 2 || model > 5) 468 model = 2; 469 switch (model) { 470 case 2: 471 rp->model = model; 472 rp->rows = 24; 473 rp->cols = 80; 474 break; 475 case 3: 476 rp->model = model; 477 rp->rows = 32; 478 rp->cols = 80; 479 break; 480 case 4: 481 rp->model = model; 482 rp->rows = 43; 483 rp->cols = 80; 484 break; 485 case 5: 486 rp->model = model; 487 rp->rows = 27; 488 rp->cols = 132; 489 break; 490 } 491 } 492 493 static void raw3270_size_device(struct raw3270 *rp, char *init_data) 494 { 495 struct raw3270_ua *uap; 496 497 /* Got a Query Reply */ 498 uap = (struct raw3270_ua *)(init_data + 1); 499 /* Paranoia check. */ 500 if (init_data[0] != 0x88 || uap->uab.qcode != 0x81) { 501 /* Couldn't detect size. Use default model 2. */ 502 rp->model = 2; 503 rp->rows = 24; 504 rp->cols = 80; 505 return; 506 } 507 /* Copy rows/columns of default Usable Area */ 508 rp->rows = uap->uab.h; 509 rp->cols = uap->uab.w; 510 /* Check for 14 bit addressing */ 511 if ((uap->uab.flags0 & 0x0d) == 0x01) 512 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags); 513 /* Check for Alternate Usable Area */ 514 if (uap->uab.l == sizeof(struct raw3270_ua) && 515 uap->aua.sdpid == 0x02) { 516 rp->rows = uap->aua.hauai; 517 rp->cols = uap->aua.wauai; 518 } 519 /* Try to find a model. */ 520 rp->model = 0; 521 if (rp->rows == 24 && rp->cols == 80) 522 rp->model = 2; 523 if (rp->rows == 32 && rp->cols == 80) 524 rp->model = 3; 525 if (rp->rows == 43 && rp->cols == 80) 526 rp->model = 4; 527 if (rp->rows == 27 && rp->cols == 132) 528 rp->model = 5; 529 } 530 531 static void raw3270_resize_work(struct work_struct *work) 532 { 533 struct raw3270 *rp = container_of(work, struct raw3270, resize_work); 534 struct raw3270_view *view; 535 536 /* Notify views about new size */ 537 list_for_each_entry(view, &rp->view_list, list) { 538 if (view->fn->resize) 539 view->fn->resize(view, rp->model, rp->rows, rp->cols, 540 rp->old_model, rp->old_rows, rp->old_cols); 541 } 542 rp->old_cols = rp->cols; 543 rp->old_rows = rp->rows; 544 rp->old_model = rp->model; 545 /* Setup processing done, now activate a view */ 546 list_for_each_entry(view, &rp->view_list, list) { 547 rp->view = view; 548 if (view->fn->activate(view) == 0) 549 break; 550 rp->view = NULL; 551 } 552 } 553 554 static void raw3270_size_device_done(struct raw3270 *rp) 555 { 556 rp->view = NULL; 557 rp->state = RAW3270_STATE_READY; 558 schedule_work(&rp->resize_work); 559 } 560 561 void raw3270_read_modified_cb(struct raw3270_request *rq, void *data) 562 { 563 struct raw3270 *rp = rq->view->dev; 564 565 raw3270_size_device(rp, data); 566 raw3270_size_device_done(rp); 567 } 568 EXPORT_SYMBOL(raw3270_read_modified_cb); 569 570 static void raw3270_read_modified(struct raw3270 *rp) 571 { 572 if (rp->state != RAW3270_STATE_W4ATTN) 573 return; 574 /* Use 'read modified' to get the result of a read partition. */ 575 memset(&rp->init_readmod, 0, sizeof(rp->init_readmod)); 576 memset(&rp->init_data, 0, sizeof(rp->init_data)); 577 rp->init_readmod.ccw.cmd_code = TC_READMOD; 578 rp->init_readmod.ccw.flags = CCW_FLAG_SLI; 579 rp->init_readmod.ccw.count = sizeof(rp->init_data); 580 rp->init_readmod.ccw.cda = (__u32)__pa(rp->init_data); 581 rp->init_readmod.callback = raw3270_read_modified_cb; 582 rp->init_readmod.callback_data = rp->init_data; 583 rp->state = RAW3270_STATE_READMOD; 584 raw3270_start_irq(&rp->init_view, &rp->init_readmod); 585 } 586 587 static void raw3270_writesf_readpart(struct raw3270 *rp) 588 { 589 static const unsigned char wbuf[] = { 590 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 591 }; 592 593 /* Store 'read partition' data stream to init_data */ 594 memset(&rp->init_readpart, 0, sizeof(rp->init_readpart)); 595 memset(&rp->init_data, 0, sizeof(rp->init_data)); 596 memcpy(&rp->init_data, wbuf, sizeof(wbuf)); 597 rp->init_readpart.ccw.cmd_code = TC_WRITESF; 598 rp->init_readpart.ccw.flags = CCW_FLAG_SLI; 599 rp->init_readpart.ccw.count = sizeof(wbuf); 600 rp->init_readpart.ccw.cda = (__u32)__pa(&rp->init_data); 601 rp->state = RAW3270_STATE_W4ATTN; 602 raw3270_start_irq(&rp->init_view, &rp->init_readpart); 603 } 604 605 /* 606 * Device reset 607 */ 608 static void raw3270_reset_device_cb(struct raw3270_request *rq, void *data) 609 { 610 struct raw3270 *rp = rq->view->dev; 611 612 if (rp->state != RAW3270_STATE_RESET) 613 return; 614 if (rq->rc) { 615 /* Reset command failed. */ 616 rp->state = RAW3270_STATE_INIT; 617 } else if (MACHINE_IS_VM) { 618 raw3270_size_device_vm(rp); 619 raw3270_size_device_done(rp); 620 } else { 621 raw3270_writesf_readpart(rp); 622 } 623 memset(&rp->init_reset, 0, sizeof(rp->init_reset)); 624 } 625 626 static int __raw3270_reset_device(struct raw3270 *rp) 627 { 628 int rc; 629 630 /* Check if reset is already pending */ 631 if (rp->init_reset.view) 632 return -EBUSY; 633 /* Store reset data stream to init_data/init_reset */ 634 rp->init_data[0] = TW_KR; 635 rp->init_reset.ccw.cmd_code = TC_EWRITEA; 636 rp->init_reset.ccw.flags = CCW_FLAG_SLI; 637 rp->init_reset.ccw.count = 1; 638 rp->init_reset.ccw.cda = (__u32)__pa(rp->init_data); 639 rp->init_reset.callback = raw3270_reset_device_cb; 640 rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset); 641 if (rc == 0 && rp->state == RAW3270_STATE_INIT) 642 rp->state = RAW3270_STATE_RESET; 643 return rc; 644 } 645 646 static int raw3270_reset_device(struct raw3270 *rp) 647 { 648 unsigned long flags; 649 int rc; 650 651 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 652 rc = __raw3270_reset_device(rp); 653 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 654 return rc; 655 } 656 657 int raw3270_reset(struct raw3270_view *view) 658 { 659 struct raw3270 *rp; 660 int rc; 661 662 rp = view->dev; 663 if (!rp || rp->view != view) 664 rc = -EACCES; 665 else if (!raw3270_state_ready(rp)) 666 rc = -EBUSY; 667 else 668 rc = raw3270_reset_device(view->dev); 669 return rc; 670 } 671 EXPORT_SYMBOL(raw3270_reset); 672 673 static void __raw3270_disconnect(struct raw3270 *rp) 674 { 675 struct raw3270_request *rq; 676 struct raw3270_view *view; 677 678 rp->state = RAW3270_STATE_INIT; 679 rp->view = &rp->init_view; 680 /* Cancel all queued requests */ 681 while (!list_empty(&rp->req_queue)) { 682 rq = list_entry(rp->req_queue.next, struct raw3270_request, list); 683 view = rq->view; 684 rq->rc = -EACCES; 685 list_del_init(&rq->list); 686 if (rq->callback) 687 rq->callback(rq, rq->callback_data); 688 raw3270_put_view(view); 689 } 690 /* Start from scratch */ 691 __raw3270_reset_device(rp); 692 } 693 694 static void raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq, 695 struct irb *irb) 696 { 697 struct raw3270 *rp; 698 699 if (rq) { 700 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 701 if (irb->ecw[0] & SNS0_CMD_REJECT) 702 rq->rc = -EOPNOTSUPP; 703 else 704 rq->rc = -EIO; 705 } 706 } 707 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 708 /* Queue read modified after attention interrupt */ 709 rp = view->dev; 710 raw3270_read_modified(rp); 711 } 712 } 713 714 static struct raw3270_fn raw3270_init_fn = { 715 .intv = raw3270_init_irq 716 }; 717 718 /* 719 * Setup new 3270 device. 720 */ 721 static int raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, 722 char *ascebc) 723 { 724 struct list_head *l; 725 struct raw3270 *tmp; 726 int minor; 727 728 memset(rp, 0, sizeof(struct raw3270)); 729 /* Copy ebcdic -> ascii translation table. */ 730 memcpy(ascebc, _ascebc, 256); 731 if (tubxcorrect) { 732 /* correct brackets and circumflex */ 733 ascebc['['] = 0xad; 734 ascebc[']'] = 0xbd; 735 ascebc['^'] = 0xb0; 736 } 737 rp->ascebc = ascebc; 738 739 /* Set defaults. */ 740 rp->rows = 24; 741 rp->cols = 80; 742 rp->old_rows = rp->rows; 743 rp->old_cols = rp->cols; 744 745 INIT_LIST_HEAD(&rp->req_queue); 746 INIT_LIST_HEAD(&rp->view_list); 747 748 rp->init_view.dev = rp; 749 rp->init_view.fn = &raw3270_init_fn; 750 rp->view = &rp->init_view; 751 INIT_WORK(&rp->resize_work, raw3270_resize_work); 752 753 /* 754 * Add device to list and find the smallest unused minor 755 * number for it. Note: there is no device with minor 0, 756 * see special case for fs3270.c:fs3270_open(). 757 */ 758 mutex_lock(&raw3270_mutex); 759 /* Keep the list sorted. */ 760 minor = RAW3270_FIRSTMINOR; 761 rp->minor = -1; 762 list_for_each(l, &raw3270_devices) { 763 tmp = list_entry(l, struct raw3270, list); 764 if (tmp->minor > minor) { 765 rp->minor = minor; 766 __list_add(&rp->list, l->prev, l); 767 break; 768 } 769 minor++; 770 } 771 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) { 772 rp->minor = minor; 773 list_add_tail(&rp->list, &raw3270_devices); 774 } 775 mutex_unlock(&raw3270_mutex); 776 /* No free minor number? Then give up. */ 777 if (rp->minor == -1) 778 return -EUSERS; 779 rp->cdev = cdev; 780 dev_set_drvdata(&cdev->dev, rp); 781 cdev->handler = raw3270_irq; 782 return 0; 783 } 784 785 #ifdef CONFIG_TN3270_CONSOLE 786 /* Tentative definition - see below for actual definition. */ 787 static struct ccw_driver raw3270_ccw_driver; 788 789 static inline int raw3270_state_final(struct raw3270 *rp) 790 { 791 return rp->state == RAW3270_STATE_INIT || 792 rp->state == RAW3270_STATE_READY; 793 } 794 795 /* 796 * Setup 3270 device configured as console. 797 */ 798 struct raw3270 __init *raw3270_setup_console(void) 799 { 800 struct ccw_device *cdev; 801 unsigned long flags; 802 struct raw3270 *rp; 803 char *ascebc; 804 int rc; 805 806 cdev = ccw_device_create_console(&raw3270_ccw_driver); 807 if (IS_ERR(cdev)) 808 return ERR_CAST(cdev); 809 810 rp = kzalloc(sizeof(*rp), GFP_KERNEL | GFP_DMA); 811 ascebc = kzalloc(256, GFP_KERNEL); 812 rc = raw3270_setup_device(cdev, rp, ascebc); 813 if (rc) 814 return ERR_PTR(rc); 815 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags); 816 817 rc = ccw_device_enable_console(cdev); 818 if (rc) { 819 ccw_device_destroy_console(cdev); 820 return ERR_PTR(rc); 821 } 822 823 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 824 do { 825 __raw3270_reset_device(rp); 826 while (!raw3270_state_final(rp)) { 827 ccw_device_wait_idle(rp->cdev); 828 barrier(); 829 } 830 } while (rp->state != RAW3270_STATE_READY); 831 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 832 return rp; 833 } 834 835 void raw3270_wait_cons_dev(struct raw3270 *rp) 836 { 837 unsigned long flags; 838 839 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 840 ccw_device_wait_idle(rp->cdev); 841 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 842 } 843 844 #endif 845 846 /* 847 * Create a 3270 device structure. 848 */ 849 static struct raw3270 *raw3270_create_device(struct ccw_device *cdev) 850 { 851 struct raw3270 *rp; 852 char *ascebc; 853 int rc; 854 855 rp = kzalloc(sizeof(*rp), GFP_KERNEL | GFP_DMA); 856 if (!rp) 857 return ERR_PTR(-ENOMEM); 858 ascebc = kmalloc(256, GFP_KERNEL); 859 if (!ascebc) { 860 kfree(rp); 861 return ERR_PTR(-ENOMEM); 862 } 863 rc = raw3270_setup_device(cdev, rp, ascebc); 864 if (rc) { 865 kfree(rp->ascebc); 866 kfree(rp); 867 rp = ERR_PTR(rc); 868 } 869 /* Get reference to ccw_device structure. */ 870 get_device(&cdev->dev); 871 return rp; 872 } 873 874 /* 875 * This helper just validates that it is safe to activate a 876 * view in the panic() context, due to locking restrictions. 877 */ 878 int raw3270_view_lock_unavailable(struct raw3270_view *view) 879 { 880 struct raw3270 *rp = view->dev; 881 882 if (!rp) 883 return -ENODEV; 884 if (spin_is_locked(get_ccwdev_lock(rp->cdev))) 885 return -EBUSY; 886 return 0; 887 } 888 889 static int raw3270_assign_activate_view(struct raw3270 *rp, struct raw3270_view *view) 890 { 891 rp->view = view; 892 return view->fn->activate(view); 893 } 894 895 static int __raw3270_activate_view(struct raw3270 *rp, struct raw3270_view *view) 896 { 897 struct raw3270_view *oldview = NULL, *nv; 898 int rc; 899 900 if (rp->view == view) 901 return 0; 902 903 if (!raw3270_state_ready(rp)) 904 return -EBUSY; 905 906 if (rp->view && rp->view->fn->deactivate) { 907 oldview = rp->view; 908 oldview->fn->deactivate(oldview); 909 } 910 911 rc = raw3270_assign_activate_view(rp, view); 912 if (!rc) 913 return 0; 914 915 /* Didn't work. Try to reactivate the old view. */ 916 if (oldview) { 917 rc = raw3270_assign_activate_view(rp, oldview); 918 if (!rc) 919 return 0; 920 } 921 922 /* Didn't work as well. Try any other view. */ 923 list_for_each_entry(nv, &rp->view_list, list) { 924 if (nv == view || nv == oldview) 925 continue; 926 rc = raw3270_assign_activate_view(rp, nv); 927 if (!rc) 928 break; 929 rp->view = NULL; 930 } 931 return rc; 932 } 933 934 /* 935 * Activate a view. 936 */ 937 int raw3270_activate_view(struct raw3270_view *view) 938 { 939 struct raw3270 *rp; 940 unsigned long flags; 941 int rc; 942 943 rp = view->dev; 944 if (!rp) 945 return -ENODEV; 946 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 947 rc = __raw3270_activate_view(rp, view); 948 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 949 return rc; 950 } 951 EXPORT_SYMBOL(raw3270_activate_view); 952 953 /* 954 * Deactivate current view. 955 */ 956 void raw3270_deactivate_view(struct raw3270_view *view) 957 { 958 unsigned long flags; 959 struct raw3270 *rp; 960 961 rp = view->dev; 962 if (!rp) 963 return; 964 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 965 if (rp->view == view) { 966 view->fn->deactivate(view); 967 rp->view = NULL; 968 /* Move deactivated view to end of list. */ 969 list_del_init(&view->list); 970 list_add_tail(&view->list, &rp->view_list); 971 /* Try to activate another view. */ 972 if (raw3270_state_ready(rp)) { 973 list_for_each_entry(view, &rp->view_list, list) { 974 rp->view = view; 975 if (view->fn->activate(view) == 0) 976 break; 977 rp->view = NULL; 978 } 979 } 980 } 981 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 982 } 983 EXPORT_SYMBOL(raw3270_deactivate_view); 984 985 /* 986 * Add view to device with minor "minor". 987 */ 988 int raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, 989 int minor, int subclass) 990 { 991 unsigned long flags; 992 struct raw3270 *rp; 993 int rc; 994 995 if (minor <= 0) 996 return -ENODEV; 997 mutex_lock(&raw3270_mutex); 998 rc = -ENODEV; 999 list_for_each_entry(rp, &raw3270_devices, list) { 1000 if (rp->minor != minor) 1001 continue; 1002 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 1003 atomic_set(&view->ref_count, 2); 1004 view->dev = rp; 1005 view->fn = fn; 1006 view->model = rp->model; 1007 view->rows = rp->rows; 1008 view->cols = rp->cols; 1009 view->ascebc = rp->ascebc; 1010 spin_lock_init(&view->lock); 1011 lockdep_set_subclass(&view->lock, subclass); 1012 list_add(&view->list, &rp->view_list); 1013 rc = 0; 1014 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 1015 break; 1016 } 1017 mutex_unlock(&raw3270_mutex); 1018 return rc; 1019 } 1020 EXPORT_SYMBOL(raw3270_add_view); 1021 1022 /* 1023 * Find specific view of device with minor "minor". 1024 */ 1025 struct raw3270_view *raw3270_find_view(struct raw3270_fn *fn, int minor) 1026 { 1027 struct raw3270 *rp; 1028 struct raw3270_view *view, *tmp; 1029 unsigned long flags; 1030 1031 mutex_lock(&raw3270_mutex); 1032 view = ERR_PTR(-ENODEV); 1033 list_for_each_entry(rp, &raw3270_devices, list) { 1034 if (rp->minor != minor) 1035 continue; 1036 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 1037 list_for_each_entry(tmp, &rp->view_list, list) { 1038 if (tmp->fn == fn) { 1039 raw3270_get_view(tmp); 1040 view = tmp; 1041 break; 1042 } 1043 } 1044 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 1045 break; 1046 } 1047 mutex_unlock(&raw3270_mutex); 1048 return view; 1049 } 1050 EXPORT_SYMBOL(raw3270_find_view); 1051 1052 /* 1053 * Remove view from device and free view structure via call to view->fn->free. 1054 */ 1055 void raw3270_del_view(struct raw3270_view *view) 1056 { 1057 unsigned long flags; 1058 struct raw3270 *rp; 1059 struct raw3270_view *nv; 1060 1061 rp = view->dev; 1062 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); 1063 if (rp->view == view) { 1064 view->fn->deactivate(view); 1065 rp->view = NULL; 1066 } 1067 list_del_init(&view->list); 1068 if (!rp->view && raw3270_state_ready(rp)) { 1069 /* Try to activate another view. */ 1070 list_for_each_entry(nv, &rp->view_list, list) { 1071 if (nv->fn->activate(nv) == 0) { 1072 rp->view = nv; 1073 break; 1074 } 1075 } 1076 } 1077 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); 1078 /* Wait for reference counter to drop to zero. */ 1079 atomic_dec(&view->ref_count); 1080 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0); 1081 if (view->fn->free) 1082 view->fn->free(view); 1083 } 1084 EXPORT_SYMBOL(raw3270_del_view); 1085 1086 /* 1087 * Remove a 3270 device structure. 1088 */ 1089 static void raw3270_delete_device(struct raw3270 *rp) 1090 { 1091 struct ccw_device *cdev; 1092 1093 /* Remove from device chain. */ 1094 mutex_lock(&raw3270_mutex); 1095 list_del_init(&rp->list); 1096 mutex_unlock(&raw3270_mutex); 1097 1098 /* Disconnect from ccw_device. */ 1099 cdev = rp->cdev; 1100 rp->cdev = NULL; 1101 dev_set_drvdata(&cdev->dev, NULL); 1102 cdev->handler = NULL; 1103 1104 /* Put ccw_device structure. */ 1105 put_device(&cdev->dev); 1106 1107 /* Now free raw3270 structure. */ 1108 kfree(rp->ascebc); 1109 kfree(rp); 1110 } 1111 1112 static int raw3270_probe(struct ccw_device *cdev) 1113 { 1114 return 0; 1115 } 1116 1117 /* 1118 * Additional attributes for a 3270 device 1119 */ 1120 static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1121 char *buf) 1122 { 1123 return sysfs_emit(buf, "%i\n", 1124 ((struct raw3270 *)dev_get_drvdata(dev))->model); 1125 } 1126 static DEVICE_ATTR_RO(model); 1127 1128 static ssize_t rows_show(struct device *dev, struct device_attribute *attr, 1129 char *buf) 1130 { 1131 return sysfs_emit(buf, "%i\n", 1132 ((struct raw3270 *)dev_get_drvdata(dev))->rows); 1133 } 1134 static DEVICE_ATTR_RO(rows); 1135 1136 static ssize_t 1137 columns_show(struct device *dev, struct device_attribute *attr, 1138 char *buf) 1139 { 1140 return sysfs_emit(buf, "%i\n", 1141 ((struct raw3270 *)dev_get_drvdata(dev))->cols); 1142 } 1143 static DEVICE_ATTR_RO(columns); 1144 1145 static struct attribute *raw3270_attrs[] = { 1146 &dev_attr_model.attr, 1147 &dev_attr_rows.attr, 1148 &dev_attr_columns.attr, 1149 NULL, 1150 }; 1151 1152 static const struct attribute_group raw3270_attr_group = { 1153 .attrs = raw3270_attrs, 1154 }; 1155 1156 static int raw3270_create_attributes(struct raw3270 *rp) 1157 { 1158 return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group); 1159 } 1160 1161 /* 1162 * Notifier for device addition/removal 1163 */ 1164 static LIST_HEAD(raw3270_notifier); 1165 1166 int raw3270_register_notifier(struct raw3270_notifier *notifier) 1167 { 1168 struct raw3270 *rp; 1169 1170 mutex_lock(&raw3270_mutex); 1171 list_add_tail(¬ifier->list, &raw3270_notifier); 1172 list_for_each_entry(rp, &raw3270_devices, list) 1173 notifier->create(rp->minor); 1174 mutex_unlock(&raw3270_mutex); 1175 return 0; 1176 } 1177 EXPORT_SYMBOL(raw3270_register_notifier); 1178 1179 void raw3270_unregister_notifier(struct raw3270_notifier *notifier) 1180 { 1181 struct raw3270 *rp; 1182 1183 mutex_lock(&raw3270_mutex); 1184 list_for_each_entry(rp, &raw3270_devices, list) 1185 notifier->destroy(rp->minor); 1186 list_del(¬ifier->list); 1187 mutex_unlock(&raw3270_mutex); 1188 } 1189 EXPORT_SYMBOL(raw3270_unregister_notifier); 1190 1191 /* 1192 * Set 3270 device online. 1193 */ 1194 static int raw3270_set_online(struct ccw_device *cdev) 1195 { 1196 struct raw3270_notifier *np; 1197 struct raw3270 *rp; 1198 int rc; 1199 1200 rp = raw3270_create_device(cdev); 1201 if (IS_ERR(rp)) 1202 return PTR_ERR(rp); 1203 rc = raw3270_create_attributes(rp); 1204 if (rc) 1205 goto failure; 1206 raw3270_reset_device(rp); 1207 mutex_lock(&raw3270_mutex); 1208 list_for_each_entry(np, &raw3270_notifier, list) 1209 np->create(rp->minor); 1210 mutex_unlock(&raw3270_mutex); 1211 return 0; 1212 1213 failure: 1214 raw3270_delete_device(rp); 1215 return rc; 1216 } 1217 1218 /* 1219 * Remove 3270 device structure. 1220 */ 1221 static void raw3270_remove(struct ccw_device *cdev) 1222 { 1223 unsigned long flags; 1224 struct raw3270 *rp; 1225 struct raw3270_view *v; 1226 struct raw3270_notifier *np; 1227 1228 rp = dev_get_drvdata(&cdev->dev); 1229 /* 1230 * _remove is the opposite of _probe; it's probe that 1231 * should set up rp. raw3270_remove gets entered for 1232 * devices even if they haven't been varied online. 1233 * Thus, rp may validly be NULL here. 1234 */ 1235 if (!rp) 1236 return; 1237 1238 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group); 1239 1240 /* Deactivate current view and remove all views. */ 1241 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1242 if (rp->view) { 1243 if (rp->view->fn->deactivate) 1244 rp->view->fn->deactivate(rp->view); 1245 rp->view = NULL; 1246 } 1247 while (!list_empty(&rp->view_list)) { 1248 v = list_entry(rp->view_list.next, struct raw3270_view, list); 1249 if (v->fn->release) 1250 v->fn->release(v); 1251 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1252 raw3270_del_view(v); 1253 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1254 } 1255 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1256 1257 mutex_lock(&raw3270_mutex); 1258 list_for_each_entry(np, &raw3270_notifier, list) 1259 np->destroy(rp->minor); 1260 mutex_unlock(&raw3270_mutex); 1261 1262 /* Reset 3270 device. */ 1263 raw3270_reset_device(rp); 1264 /* And finally remove it. */ 1265 raw3270_delete_device(rp); 1266 } 1267 1268 /* 1269 * Set 3270 device offline. 1270 */ 1271 static int raw3270_set_offline(struct ccw_device *cdev) 1272 { 1273 struct raw3270 *rp; 1274 1275 rp = dev_get_drvdata(&cdev->dev); 1276 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) 1277 return -EBUSY; 1278 raw3270_remove(cdev); 1279 return 0; 1280 } 1281 1282 static struct ccw_device_id raw3270_id[] = { 1283 { CCW_DEVICE(0x3270, 0) }, 1284 { CCW_DEVICE(0x3271, 0) }, 1285 { CCW_DEVICE(0x3272, 0) }, 1286 { CCW_DEVICE(0x3273, 0) }, 1287 { CCW_DEVICE(0x3274, 0) }, 1288 { CCW_DEVICE(0x3275, 0) }, 1289 { CCW_DEVICE(0x3276, 0) }, 1290 { CCW_DEVICE(0x3277, 0) }, 1291 { CCW_DEVICE(0x3278, 0) }, 1292 { CCW_DEVICE(0x3279, 0) }, 1293 { CCW_DEVICE(0x3174, 0) }, 1294 { /* end of list */ }, 1295 }; 1296 1297 static struct ccw_driver raw3270_ccw_driver = { 1298 .driver = { 1299 .name = "3270", 1300 .owner = THIS_MODULE, 1301 }, 1302 .ids = raw3270_id, 1303 .probe = &raw3270_probe, 1304 .remove = &raw3270_remove, 1305 .set_online = &raw3270_set_online, 1306 .set_offline = &raw3270_set_offline, 1307 .int_class = IRQIO_C70, 1308 }; 1309 1310 static int raw3270_init(void) 1311 { 1312 struct raw3270 *rp; 1313 int rc; 1314 1315 if (raw3270_registered) 1316 return 0; 1317 raw3270_registered = 1; 1318 rc = ccw_driver_register(&raw3270_ccw_driver); 1319 if (rc == 0) { 1320 /* Create attributes for early (= console) device. */ 1321 mutex_lock(&raw3270_mutex); 1322 class3270 = class_create("3270"); 1323 list_for_each_entry(rp, &raw3270_devices, list) { 1324 get_device(&rp->cdev->dev); 1325 raw3270_create_attributes(rp); 1326 } 1327 mutex_unlock(&raw3270_mutex); 1328 } 1329 return rc; 1330 } 1331 1332 static void raw3270_exit(void) 1333 { 1334 ccw_driver_unregister(&raw3270_ccw_driver); 1335 class_destroy(class3270); 1336 } 1337 1338 MODULE_LICENSE("GPL"); 1339 1340 module_init(raw3270_init); 1341 module_exit(raw3270_exit); 1342