| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * standard tape device functions for ibm tapes. |
| 4 | * |
| 5 | * S390 and zSeries version |
| 6 | * Copyright IBM Corp. 2001, 2002 |
| 7 | * Author(s): Carsten Otte <cotte@de.ibm.com> |
| 8 | * Michael Holzheu <holzheu@de.ibm.com> |
| 9 | * Tuan Ngo-Anh <ngoanh@de.ibm.com> |
| 10 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 11 | * Stefan Bader <shbader@de.ibm.com> |
| 12 | */ |
| 13 | |
| 14 | #define KMSG_COMPONENT "tape" |
| 15 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 16 | |
| 17 | #include <linux/stddef.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/bio.h> |
| 20 | #include <linux/timer.h> |
| 21 | |
| 22 | #include <asm/types.h> |
| 23 | #include <asm/idals.h> |
| 24 | #include <asm/ebcdic.h> |
| 25 | #include <asm/tape390.h> |
| 26 | |
| 27 | #define TAPE_DBF_AREA tape_core_dbf |
| 28 | |
| 29 | #include "tape.h" |
| 30 | #include "tape_std.h" |
| 31 | |
| 32 | /* |
| 33 | * tape_std_assign |
| 34 | */ |
| 35 | static void |
| 36 | tape_std_assign_timeout(struct timer_list *t) |
| 37 | { |
| 38 | struct tape_request * request = from_timer(request, t, timer); |
| 39 | struct tape_device * device = request->device; |
| 40 | int rc; |
| 41 | |
| 42 | BUG_ON(!device); |
| 43 | |
| 44 | DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", |
| 45 | device->cdev_id); |
| 46 | rc = tape_cancel_io(device, request); |
| 47 | if(rc) |
| 48 | DBF_EVENT(3, "(%08x): Assign timeout: Cancel failed with rc = " |
| 49 | "%i\n", device->cdev_id, rc); |
| 50 | } |
| 51 | |
| 52 | int |
| 53 | tape_std_assign(struct tape_device *device) |
| 54 | { |
| 55 | int rc; |
| 56 | struct tape_request *request; |
| 57 | |
| 58 | request = tape_alloc_request(2, 11); |
| 59 | if (IS_ERR(request)) |
| 60 | return PTR_ERR(request); |
| 61 | |
| 62 | request->op = TO_ASSIGN; |
| 63 | tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); |
| 64 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 65 | |
| 66 | /* |
| 67 | * The assign command sometimes blocks if the device is assigned |
| 68 | * to another host (actually this shouldn't happen but it does). |
| 69 | * So we set up a timeout for this call. |
| 70 | */ |
| 71 | timer_setup(&request->timer, tape_std_assign_timeout, 0); |
| 72 | mod_timer(&request->timer, jiffies + msecs_to_jiffies(2000)); |
| 73 | |
| 74 | rc = tape_do_io_interruptible(device, request); |
| 75 | |
| 76 | del_timer_sync(&request->timer); |
| 77 | |
| 78 | if (rc != 0) { |
| 79 | DBF_EVENT(3, "%08x: assign failed - device might be busy\n", |
| 80 | device->cdev_id); |
| 81 | } else { |
| 82 | DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); |
| 83 | } |
| 84 | tape_free_request(request); |
| 85 | return rc; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * tape_std_unassign |
| 90 | */ |
| 91 | int |
| 92 | tape_std_unassign (struct tape_device *device) |
| 93 | { |
| 94 | int rc; |
| 95 | struct tape_request *request; |
| 96 | |
| 97 | if (device->tape_state == TS_NOT_OPER) { |
| 98 | DBF_EVENT(3, "(%08x): Can't unassign device\n", |
| 99 | device->cdev_id); |
| 100 | return -EIO; |
| 101 | } |
| 102 | |
| 103 | request = tape_alloc_request(2, 11); |
| 104 | if (IS_ERR(request)) |
| 105 | return PTR_ERR(request); |
| 106 | |
| 107 | request->op = TO_UNASSIGN; |
| 108 | tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); |
| 109 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 110 | |
| 111 | if ((rc = tape_do_io(device, request)) != 0) { |
| 112 | DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); |
| 113 | } else { |
| 114 | DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); |
| 115 | } |
| 116 | tape_free_request(request); |
| 117 | return rc; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * TAPE390_DISPLAY: Show a string on the tape display. |
| 122 | */ |
| 123 | int |
| 124 | tape_std_display(struct tape_device *device, struct display_struct *disp) |
| 125 | { |
| 126 | struct tape_request *request; |
| 127 | int rc; |
| 128 | |
| 129 | request = tape_alloc_request(2, 17); |
| 130 | if (IS_ERR(request)) { |
| 131 | DBF_EVENT(3, "TAPE: load display failed\n"); |
| 132 | return PTR_ERR(request); |
| 133 | } |
| 134 | request->op = TO_DIS; |
| 135 | |
| 136 | *(unsigned char *) request->cpdata = disp->cntrl; |
| 137 | DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); |
| 138 | memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); |
| 139 | memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); |
| 140 | ASCEBC(((unsigned char*) request->cpdata) + 1, 16); |
| 141 | |
| 142 | tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); |
| 143 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 144 | |
| 145 | rc = tape_do_io_interruptible(device, request); |
| 146 | tape_free_request(request); |
| 147 | return rc; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * Read block id. |
| 152 | */ |
| 153 | int |
| 154 | tape_std_read_block_id(struct tape_device *device, __u64 *id) |
| 155 | { |
| 156 | struct tape_request *request; |
| 157 | int rc; |
| 158 | |
| 159 | request = tape_alloc_request(3, 8); |
| 160 | if (IS_ERR(request)) |
| 161 | return PTR_ERR(request); |
| 162 | request->op = TO_RBI; |
| 163 | /* setup ccws */ |
| 164 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 165 | tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); |
| 166 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 167 | /* execute it */ |
| 168 | rc = tape_do_io(device, request); |
| 169 | if (rc == 0) |
| 170 | /* Get result from read buffer. */ |
| 171 | *id = *(__u64 *) request->cpdata; |
| 172 | tape_free_request(request); |
| 173 | return rc; |
| 174 | } |
| 175 | |
| 176 | int |
| 177 | tape_std_terminate_write(struct tape_device *device) |
| 178 | { |
| 179 | int rc; |
| 180 | |
| 181 | if(device->required_tapemarks == 0) |
| 182 | return 0; |
| 183 | |
| 184 | DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, |
| 185 | device->required_tapemarks); |
| 186 | |
| 187 | rc = tape_mtop(device, MTWEOF, device->required_tapemarks); |
| 188 | if (rc) |
| 189 | return rc; |
| 190 | |
| 191 | device->required_tapemarks = 0; |
| 192 | return tape_mtop(device, MTBSR, 1); |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * MTLOAD: Loads the tape. |
| 197 | * The default implementation just wait until the tape medium state changes |
| 198 | * to MS_LOADED. |
| 199 | */ |
| 200 | int |
| 201 | tape_std_mtload(struct tape_device *device, int count) |
| 202 | { |
| 203 | return wait_event_interruptible(device->state_change_wq, |
| 204 | (device->medium_state == MS_LOADED)); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * MTSETBLK: Set block size. |
| 209 | */ |
| 210 | int |
| 211 | tape_std_mtsetblk(struct tape_device *device, int count) |
| 212 | { |
| 213 | struct idal_buffer *new; |
| 214 | |
| 215 | DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); |
| 216 | if (count <= 0) { |
| 217 | /* |
| 218 | * Just set block_size to 0. tapechar_read/tapechar_write |
| 219 | * will realloc the idal buffer if a bigger one than the |
| 220 | * current is needed. |
| 221 | */ |
| 222 | device->char_data.block_size = 0; |
| 223 | return 0; |
| 224 | } |
| 225 | if (device->char_data.idal_buf != NULL && |
| 226 | device->char_data.idal_buf->size == count) |
| 227 | /* We already have a idal buffer of that size. */ |
| 228 | return 0; |
| 229 | |
| 230 | if (count > MAX_BLOCKSIZE) { |
| 231 | DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", |
| 232 | count, MAX_BLOCKSIZE); |
| 233 | return -EINVAL; |
| 234 | } |
| 235 | |
| 236 | /* Allocate a new idal buffer. */ |
| 237 | new = idal_buffer_alloc(count, 0); |
| 238 | if (IS_ERR(new)) |
| 239 | return -ENOMEM; |
| 240 | if (device->char_data.idal_buf != NULL) |
| 241 | idal_buffer_free(device->char_data.idal_buf); |
| 242 | device->char_data.idal_buf = new; |
| 243 | device->char_data.block_size = count; |
| 244 | |
| 245 | DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * MTRESET: Set block size to 0. |
| 252 | */ |
| 253 | int |
| 254 | tape_std_mtreset(struct tape_device *device, int count) |
| 255 | { |
| 256 | DBF_EVENT(6, "TCHAR:devreset:\n"); |
| 257 | device->char_data.block_size = 0; |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * MTFSF: Forward space over 'count' file marks. The tape is positioned |
| 263 | * at the EOT (End of Tape) side of the file mark. |
| 264 | */ |
| 265 | int |
| 266 | tape_std_mtfsf(struct tape_device *device, int mt_count) |
| 267 | { |
| 268 | struct tape_request *request; |
| 269 | struct ccw1 *ccw; |
| 270 | |
| 271 | request = tape_alloc_request(mt_count + 2, 0); |
| 272 | if (IS_ERR(request)) |
| 273 | return PTR_ERR(request); |
| 274 | request->op = TO_FSF; |
| 275 | /* setup ccws */ |
| 276 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 277 | device->modeset_byte); |
| 278 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); |
| 279 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 280 | |
| 281 | /* execute it */ |
| 282 | return tape_do_io_free(device, request); |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * MTFSR: Forward space over 'count' tape blocks (blocksize is set |
| 287 | * via MTSETBLK. |
| 288 | */ |
| 289 | int |
| 290 | tape_std_mtfsr(struct tape_device *device, int mt_count) |
| 291 | { |
| 292 | struct tape_request *request; |
| 293 | struct ccw1 *ccw; |
| 294 | int rc; |
| 295 | |
| 296 | request = tape_alloc_request(mt_count + 2, 0); |
| 297 | if (IS_ERR(request)) |
| 298 | return PTR_ERR(request); |
| 299 | request->op = TO_FSB; |
| 300 | /* setup ccws */ |
| 301 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 302 | device->modeset_byte); |
| 303 | ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); |
| 304 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 305 | |
| 306 | /* execute it */ |
| 307 | rc = tape_do_io(device, request); |
| 308 | if (rc == 0 && request->rescnt > 0) { |
| 309 | DBF_LH(3, "FSR over tapemark\n"); |
| 310 | rc = 1; |
| 311 | } |
| 312 | tape_free_request(request); |
| 313 | |
| 314 | return rc; |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * MTBSR: Backward space over 'count' tape blocks. |
| 319 | * (blocksize is set via MTSETBLK. |
| 320 | */ |
| 321 | int |
| 322 | tape_std_mtbsr(struct tape_device *device, int mt_count) |
| 323 | { |
| 324 | struct tape_request *request; |
| 325 | struct ccw1 *ccw; |
| 326 | int rc; |
| 327 | |
| 328 | request = tape_alloc_request(mt_count + 2, 0); |
| 329 | if (IS_ERR(request)) |
| 330 | return PTR_ERR(request); |
| 331 | request->op = TO_BSB; |
| 332 | /* setup ccws */ |
| 333 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 334 | device->modeset_byte); |
| 335 | ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); |
| 336 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 337 | |
| 338 | /* execute it */ |
| 339 | rc = tape_do_io(device, request); |
| 340 | if (rc == 0 && request->rescnt > 0) { |
| 341 | DBF_LH(3, "BSR over tapemark\n"); |
| 342 | rc = 1; |
| 343 | } |
| 344 | tape_free_request(request); |
| 345 | |
| 346 | return rc; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * MTWEOF: Write 'count' file marks at the current position. |
| 351 | */ |
| 352 | int |
| 353 | tape_std_mtweof(struct tape_device *device, int mt_count) |
| 354 | { |
| 355 | struct tape_request *request; |
| 356 | struct ccw1 *ccw; |
| 357 | |
| 358 | request = tape_alloc_request(mt_count + 2, 0); |
| 359 | if (IS_ERR(request)) |
| 360 | return PTR_ERR(request); |
| 361 | request->op = TO_WTM; |
| 362 | /* setup ccws */ |
| 363 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 364 | device->modeset_byte); |
| 365 | ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); |
| 366 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 367 | |
| 368 | /* execute it */ |
| 369 | return tape_do_io_free(device, request); |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * MTBSFM: Backward space over 'count' file marks. |
| 374 | * The tape is positioned at the BOT (Begin Of Tape) side of the |
| 375 | * last skipped file mark. |
| 376 | */ |
| 377 | int |
| 378 | tape_std_mtbsfm(struct tape_device *device, int mt_count) |
| 379 | { |
| 380 | struct tape_request *request; |
| 381 | struct ccw1 *ccw; |
| 382 | |
| 383 | request = tape_alloc_request(mt_count + 2, 0); |
| 384 | if (IS_ERR(request)) |
| 385 | return PTR_ERR(request); |
| 386 | request->op = TO_BSF; |
| 387 | /* setup ccws */ |
| 388 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 389 | device->modeset_byte); |
| 390 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); |
| 391 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 392 | |
| 393 | /* execute it */ |
| 394 | return tape_do_io_free(device, request); |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * MTBSF: Backward space over 'count' file marks. The tape is positioned at |
| 399 | * the EOT (End of Tape) side of the last skipped file mark. |
| 400 | */ |
| 401 | int |
| 402 | tape_std_mtbsf(struct tape_device *device, int mt_count) |
| 403 | { |
| 404 | struct tape_request *request; |
| 405 | struct ccw1 *ccw; |
| 406 | int rc; |
| 407 | |
| 408 | request = tape_alloc_request(mt_count + 2, 0); |
| 409 | if (IS_ERR(request)) |
| 410 | return PTR_ERR(request); |
| 411 | request->op = TO_BSF; |
| 412 | /* setup ccws */ |
| 413 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 414 | device->modeset_byte); |
| 415 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); |
| 416 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 417 | /* execute it */ |
| 418 | rc = tape_do_io_free(device, request); |
| 419 | if (rc == 0) { |
| 420 | rc = tape_mtop(device, MTFSR, 1); |
| 421 | if (rc > 0) |
| 422 | rc = 0; |
| 423 | } |
| 424 | return rc; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * MTFSFM: Forward space over 'count' file marks. |
| 429 | * The tape is positioned at the BOT (Begin Of Tape) side |
| 430 | * of the last skipped file mark. |
| 431 | */ |
| 432 | int |
| 433 | tape_std_mtfsfm(struct tape_device *device, int mt_count) |
| 434 | { |
| 435 | struct tape_request *request; |
| 436 | struct ccw1 *ccw; |
| 437 | int rc; |
| 438 | |
| 439 | request = tape_alloc_request(mt_count + 2, 0); |
| 440 | if (IS_ERR(request)) |
| 441 | return PTR_ERR(request); |
| 442 | request->op = TO_FSF; |
| 443 | /* setup ccws */ |
| 444 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 445 | device->modeset_byte); |
| 446 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); |
| 447 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 448 | /* execute it */ |
| 449 | rc = tape_do_io_free(device, request); |
| 450 | if (rc == 0) { |
| 451 | rc = tape_mtop(device, MTBSR, 1); |
| 452 | if (rc > 0) |
| 453 | rc = 0; |
| 454 | } |
| 455 | |
| 456 | return rc; |
| 457 | } |
| 458 | |
| 459 | /* |
| 460 | * MTREW: Rewind the tape. |
| 461 | */ |
| 462 | int |
| 463 | tape_std_mtrew(struct tape_device *device, int mt_count) |
| 464 | { |
| 465 | struct tape_request *request; |
| 466 | |
| 467 | request = tape_alloc_request(3, 0); |
| 468 | if (IS_ERR(request)) |
| 469 | return PTR_ERR(request); |
| 470 | request->op = TO_REW; |
| 471 | /* setup ccws */ |
| 472 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 473 | device->modeset_byte); |
| 474 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); |
| 475 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 476 | |
| 477 | /* execute it */ |
| 478 | return tape_do_io_free(device, request); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * MTOFFL: Rewind the tape and put the drive off-line. |
| 483 | * Implement 'rewind unload' |
| 484 | */ |
| 485 | int |
| 486 | tape_std_mtoffl(struct tape_device *device, int mt_count) |
| 487 | { |
| 488 | struct tape_request *request; |
| 489 | |
| 490 | request = tape_alloc_request(3, 0); |
| 491 | if (IS_ERR(request)) |
| 492 | return PTR_ERR(request); |
| 493 | request->op = TO_RUN; |
| 494 | /* setup ccws */ |
| 495 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 496 | tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); |
| 497 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 498 | |
| 499 | /* execute it */ |
| 500 | return tape_do_io_free(device, request); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * MTNOP: 'No operation'. |
| 505 | */ |
| 506 | int |
| 507 | tape_std_mtnop(struct tape_device *device, int mt_count) |
| 508 | { |
| 509 | struct tape_request *request; |
| 510 | |
| 511 | request = tape_alloc_request(2, 0); |
| 512 | if (IS_ERR(request)) |
| 513 | return PTR_ERR(request); |
| 514 | request->op = TO_NOP; |
| 515 | /* setup ccws */ |
| 516 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 517 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 518 | /* execute it */ |
| 519 | return tape_do_io_free(device, request); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * MTEOM: positions at the end of the portion of the tape already used |
| 524 | * for recordind data. MTEOM positions after the last file mark, ready for |
| 525 | * appending another file. |
| 526 | */ |
| 527 | int |
| 528 | tape_std_mteom(struct tape_device *device, int mt_count) |
| 529 | { |
| 530 | int rc; |
| 531 | |
| 532 | /* |
| 533 | * Seek from the beginning of tape (rewind). |
| 534 | */ |
| 535 | if ((rc = tape_mtop(device, MTREW, 1)) < 0) |
| 536 | return rc; |
| 537 | |
| 538 | /* |
| 539 | * The logical end of volume is given by two sewuential tapemarks. |
| 540 | * Look for this by skipping to the next file (over one tapemark) |
| 541 | * and then test for another one (fsr returns 1 if a tapemark was |
| 542 | * encountered). |
| 543 | */ |
| 544 | do { |
| 545 | if ((rc = tape_mtop(device, MTFSF, 1)) < 0) |
| 546 | return rc; |
| 547 | if ((rc = tape_mtop(device, MTFSR, 1)) < 0) |
| 548 | return rc; |
| 549 | } while (rc == 0); |
| 550 | |
| 551 | return tape_mtop(device, MTBSR, 1); |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. |
| 556 | */ |
| 557 | int |
| 558 | tape_std_mtreten(struct tape_device *device, int mt_count) |
| 559 | { |
| 560 | struct tape_request *request; |
| 561 | |
| 562 | request = tape_alloc_request(4, 0); |
| 563 | if (IS_ERR(request)) |
| 564 | return PTR_ERR(request); |
| 565 | request->op = TO_FSF; |
| 566 | /* setup ccws */ |
| 567 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 568 | tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); |
| 569 | tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); |
| 570 | tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); |
| 571 | /* execute it, MTRETEN rc gets ignored */ |
| 572 | tape_do_io_interruptible(device, request); |
| 573 | tape_free_request(request); |
| 574 | return tape_mtop(device, MTREW, 1); |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * MTERASE: erases the tape. |
| 579 | */ |
| 580 | int |
| 581 | tape_std_mterase(struct tape_device *device, int mt_count) |
| 582 | { |
| 583 | struct tape_request *request; |
| 584 | |
| 585 | request = tape_alloc_request(6, 0); |
| 586 | if (IS_ERR(request)) |
| 587 | return PTR_ERR(request); |
| 588 | request->op = TO_DSE; |
| 589 | /* setup ccws */ |
| 590 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 591 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); |
| 592 | tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); |
| 593 | tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); |
| 594 | tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); |
| 595 | tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); |
| 596 | |
| 597 | /* execute it */ |
| 598 | return tape_do_io_free(device, request); |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * MTUNLOAD: Rewind the tape and unload it. |
| 603 | */ |
| 604 | int |
| 605 | tape_std_mtunload(struct tape_device *device, int mt_count) |
| 606 | { |
| 607 | return tape_mtop(device, MTOFFL, mt_count); |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * MTCOMPRESSION: used to enable compression. |
| 612 | * Sets the IDRC on/off. |
| 613 | */ |
| 614 | int |
| 615 | tape_std_mtcompression(struct tape_device *device, int mt_count) |
| 616 | { |
| 617 | struct tape_request *request; |
| 618 | |
| 619 | if (mt_count < 0 || mt_count > 1) { |
| 620 | DBF_EXCEPTION(6, "xcom parm\n"); |
| 621 | return -EINVAL; |
| 622 | } |
| 623 | request = tape_alloc_request(2, 0); |
| 624 | if (IS_ERR(request)) |
| 625 | return PTR_ERR(request); |
| 626 | request->op = TO_NOP; |
| 627 | /* setup ccws */ |
| 628 | if (mt_count == 0) |
| 629 | *device->modeset_byte &= ~0x08; |
| 630 | else |
| 631 | *device->modeset_byte |= 0x08; |
| 632 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 633 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 634 | /* execute it */ |
| 635 | return tape_do_io_free(device, request); |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Read Block |
| 640 | */ |
| 641 | struct tape_request * |
| 642 | tape_std_read_block(struct tape_device *device, size_t count) |
| 643 | { |
| 644 | struct tape_request *request; |
| 645 | |
| 646 | /* |
| 647 | * We have to alloc 4 ccws in order to be able to transform request |
| 648 | * into a read backward request in error case. |
| 649 | */ |
| 650 | request = tape_alloc_request(4, 0); |
| 651 | if (IS_ERR(request)) { |
| 652 | DBF_EXCEPTION(6, "xrbl fail"); |
| 653 | return request; |
| 654 | } |
| 655 | request->op = TO_RFO; |
| 656 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 657 | tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, |
| 658 | device->char_data.idal_buf); |
| 659 | DBF_EVENT(6, "xrbl ccwg\n"); |
| 660 | return request; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * Read Block backward transformation function. |
| 665 | */ |
| 666 | void |
| 667 | tape_std_read_backward(struct tape_device *device, struct tape_request *request) |
| 668 | { |
| 669 | /* |
| 670 | * We have allocated 4 ccws in tape_std_read, so we can now |
| 671 | * transform the request to a read backward, followed by a |
| 672 | * forward space block. |
| 673 | */ |
| 674 | request->op = TO_RBA; |
| 675 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 676 | tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, |
| 677 | device->char_data.idal_buf); |
| 678 | tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); |
| 679 | tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); |
| 680 | DBF_EVENT(6, "xrop ccwg");} |
| 681 | |
| 682 | /* |
| 683 | * Write Block |
| 684 | */ |
| 685 | struct tape_request * |
| 686 | tape_std_write_block(struct tape_device *device, size_t count) |
| 687 | { |
| 688 | struct tape_request *request; |
| 689 | |
| 690 | request = tape_alloc_request(2, 0); |
| 691 | if (IS_ERR(request)) { |
| 692 | DBF_EXCEPTION(6, "xwbl fail\n"); |
| 693 | return request; |
| 694 | } |
| 695 | request->op = TO_WRI; |
| 696 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 697 | tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, |
| 698 | device->char_data.idal_buf); |
| 699 | DBF_EVENT(6, "xwbl ccwg\n"); |
| 700 | return request; |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * This routine is called by frontend after an ENOSP on write |
| 705 | */ |
| 706 | void |
| 707 | tape_std_process_eov(struct tape_device *device) |
| 708 | { |
| 709 | /* |
| 710 | * End of volume: We have to backspace the last written record, then |
| 711 | * we TRY to write a tapemark and then backspace over the written TM |
| 712 | */ |
| 713 | if (tape_mtop(device, MTBSR, 1) == 0 && |
| 714 | tape_mtop(device, MTWEOF, 1) == 0) { |
| 715 | tape_mtop(device, MTBSR, 1); |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | EXPORT_SYMBOL(tape_std_assign); |
| 720 | EXPORT_SYMBOL(tape_std_unassign); |
| 721 | EXPORT_SYMBOL(tape_std_display); |
| 722 | EXPORT_SYMBOL(tape_std_read_block_id); |
| 723 | EXPORT_SYMBOL(tape_std_mtload); |
| 724 | EXPORT_SYMBOL(tape_std_mtsetblk); |
| 725 | EXPORT_SYMBOL(tape_std_mtreset); |
| 726 | EXPORT_SYMBOL(tape_std_mtfsf); |
| 727 | EXPORT_SYMBOL(tape_std_mtfsr); |
| 728 | EXPORT_SYMBOL(tape_std_mtbsr); |
| 729 | EXPORT_SYMBOL(tape_std_mtweof); |
| 730 | EXPORT_SYMBOL(tape_std_mtbsfm); |
| 731 | EXPORT_SYMBOL(tape_std_mtbsf); |
| 732 | EXPORT_SYMBOL(tape_std_mtfsfm); |
| 733 | EXPORT_SYMBOL(tape_std_mtrew); |
| 734 | EXPORT_SYMBOL(tape_std_mtoffl); |
| 735 | EXPORT_SYMBOL(tape_std_mtnop); |
| 736 | EXPORT_SYMBOL(tape_std_mteom); |
| 737 | EXPORT_SYMBOL(tape_std_mtreten); |
| 738 | EXPORT_SYMBOL(tape_std_mterase); |
| 739 | EXPORT_SYMBOL(tape_std_mtunload); |
| 740 | EXPORT_SYMBOL(tape_std_mtcompression); |
| 741 | EXPORT_SYMBOL(tape_std_read_block); |
| 742 | EXPORT_SYMBOL(tape_std_read_backward); |
| 743 | EXPORT_SYMBOL(tape_std_write_block); |
| 744 | EXPORT_SYMBOL(tape_std_process_eov); |