Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/tape_std.c |
| 3 | * standard tape device functions for ibm tapes. |
| 4 | * |
| 5 | * S390 and zSeries version |
| 6 | * Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/stddef.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/bio.h> |
| 17 | #include <linux/timer.h> |
| 18 | |
| 19 | #include <asm/types.h> |
| 20 | #include <asm/idals.h> |
| 21 | #include <asm/ebcdic.h> |
| 22 | #include <asm/tape390.h> |
| 23 | |
| 24 | #define TAPE_DBF_AREA tape_core_dbf |
| 25 | |
| 26 | #include "tape.h" |
| 27 | #include "tape_std.h" |
| 28 | |
| 29 | #define PRINTK_HEADER "TAPE_STD: " |
| 30 | |
| 31 | /* |
| 32 | * tape_std_assign |
| 33 | */ |
| 34 | static void |
| 35 | tape_std_assign_timeout(unsigned long data) |
| 36 | { |
| 37 | struct tape_request * request; |
| 38 | struct tape_device * device; |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 39 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | request = (struct tape_request *) data; |
| 42 | if ((device = request->device) == NULL) |
| 43 | BUG(); |
| 44 | |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 45 | DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | device->cdev_id); |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 47 | rc = tape_cancel_io(device, request); |
| 48 | if(rc) |
| 49 | PRINT_ERR("(%s): Assign timeout: Cancel failed with rc = %i\n", |
| 50 | device->cdev->dev.bus_id, rc); |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | int |
| 55 | tape_std_assign(struct tape_device *device) |
| 56 | { |
| 57 | int rc; |
| 58 | struct timer_list timeout; |
| 59 | struct tape_request *request; |
| 60 | |
| 61 | request = tape_alloc_request(2, 11); |
| 62 | if (IS_ERR(request)) |
| 63 | return PTR_ERR(request); |
| 64 | |
| 65 | request->op = TO_ASSIGN; |
| 66 | tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); |
| 67 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 68 | |
| 69 | /* |
| 70 | * The assign command sometimes blocks if the device is assigned |
| 71 | * to another host (actually this shouldn't happen but it does). |
| 72 | * So we set up a timeout for this call. |
| 73 | */ |
| 74 | init_timer(&timeout); |
| 75 | timeout.function = tape_std_assign_timeout; |
| 76 | timeout.data = (unsigned long) request; |
| 77 | timeout.expires = jiffies + 2 * HZ; |
| 78 | add_timer(&timeout); |
| 79 | |
| 80 | rc = tape_do_io_interruptible(device, request); |
| 81 | |
| 82 | del_timer(&timeout); |
| 83 | |
| 84 | if (rc != 0) { |
| 85 | PRINT_WARN("%s: assign failed - device might be busy\n", |
| 86 | device->cdev->dev.bus_id); |
| 87 | DBF_EVENT(3, "%08x: assign failed - device might be busy\n", |
| 88 | device->cdev_id); |
| 89 | } else { |
| 90 | DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); |
| 91 | } |
| 92 | tape_free_request(request); |
| 93 | return rc; |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * tape_std_unassign |
| 98 | */ |
| 99 | int |
| 100 | tape_std_unassign (struct tape_device *device) |
| 101 | { |
| 102 | int rc; |
| 103 | struct tape_request *request; |
| 104 | |
| 105 | if (device->tape_state == TS_NOT_OPER) { |
| 106 | DBF_EVENT(3, "(%08x): Can't unassign device\n", |
| 107 | device->cdev_id); |
| 108 | PRINT_WARN("(%s): Can't unassign device - device gone\n", |
| 109 | device->cdev->dev.bus_id); |
| 110 | return -EIO; |
| 111 | } |
| 112 | |
| 113 | request = tape_alloc_request(2, 11); |
| 114 | if (IS_ERR(request)) |
| 115 | return PTR_ERR(request); |
| 116 | |
| 117 | request->op = TO_UNASSIGN; |
| 118 | tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); |
| 119 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 120 | |
| 121 | if ((rc = tape_do_io(device, request)) != 0) { |
| 122 | DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); |
| 123 | PRINT_WARN("%s: Unassign failed\n", device->cdev->dev.bus_id); |
| 124 | } else { |
| 125 | DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); |
| 126 | } |
| 127 | tape_free_request(request); |
| 128 | return rc; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * TAPE390_DISPLAY: Show a string on the tape display. |
| 133 | */ |
| 134 | int |
| 135 | tape_std_display(struct tape_device *device, struct display_struct *disp) |
| 136 | { |
| 137 | struct tape_request *request; |
| 138 | int rc; |
| 139 | |
| 140 | request = tape_alloc_request(2, 17); |
| 141 | if (IS_ERR(request)) { |
| 142 | DBF_EVENT(3, "TAPE: load display failed\n"); |
| 143 | return PTR_ERR(request); |
| 144 | } |
| 145 | request->op = TO_DIS; |
| 146 | |
| 147 | *(unsigned char *) request->cpdata = disp->cntrl; |
| 148 | DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); |
| 149 | memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); |
| 150 | memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); |
| 151 | ASCEBC(((unsigned char*) request->cpdata) + 1, 16); |
| 152 | |
| 153 | tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); |
| 154 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 155 | |
| 156 | rc = tape_do_io_interruptible(device, request); |
| 157 | tape_free_request(request); |
| 158 | return rc; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Read block id. |
| 163 | */ |
| 164 | int |
| 165 | tape_std_read_block_id(struct tape_device *device, __u64 *id) |
| 166 | { |
| 167 | struct tape_request *request; |
| 168 | int rc; |
| 169 | |
| 170 | request = tape_alloc_request(3, 8); |
| 171 | if (IS_ERR(request)) |
| 172 | return PTR_ERR(request); |
| 173 | request->op = TO_RBI; |
| 174 | /* setup ccws */ |
| 175 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 176 | tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); |
| 177 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 178 | /* execute it */ |
| 179 | rc = tape_do_io(device, request); |
| 180 | if (rc == 0) |
| 181 | /* Get result from read buffer. */ |
| 182 | *id = *(__u64 *) request->cpdata; |
| 183 | tape_free_request(request); |
| 184 | return rc; |
| 185 | } |
| 186 | |
| 187 | int |
| 188 | tape_std_terminate_write(struct tape_device *device) |
| 189 | { |
| 190 | int rc; |
| 191 | |
| 192 | if(device->required_tapemarks == 0) |
| 193 | return 0; |
| 194 | |
| 195 | DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, |
| 196 | device->required_tapemarks); |
| 197 | |
| 198 | rc = tape_mtop(device, MTWEOF, device->required_tapemarks); |
| 199 | if (rc) |
| 200 | return rc; |
| 201 | |
| 202 | device->required_tapemarks = 0; |
| 203 | return tape_mtop(device, MTBSR, 1); |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * MTLOAD: Loads the tape. |
| 208 | * The default implementation just wait until the tape medium state changes |
| 209 | * to MS_LOADED. |
| 210 | */ |
| 211 | int |
| 212 | tape_std_mtload(struct tape_device *device, int count) |
| 213 | { |
| 214 | return wait_event_interruptible(device->state_change_wq, |
| 215 | (device->medium_state == MS_LOADED)); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * MTSETBLK: Set block size. |
| 220 | */ |
| 221 | int |
| 222 | tape_std_mtsetblk(struct tape_device *device, int count) |
| 223 | { |
| 224 | struct idal_buffer *new; |
| 225 | |
| 226 | DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); |
| 227 | if (count <= 0) { |
| 228 | /* |
| 229 | * Just set block_size to 0. tapechar_read/tapechar_write |
| 230 | * will realloc the idal buffer if a bigger one than the |
| 231 | * current is needed. |
| 232 | */ |
| 233 | device->char_data.block_size = 0; |
| 234 | return 0; |
| 235 | } |
| 236 | if (device->char_data.idal_buf != NULL && |
| 237 | device->char_data.idal_buf->size == count) |
| 238 | /* We already have a idal buffer of that size. */ |
| 239 | return 0; |
| 240 | |
| 241 | if (count > MAX_BLOCKSIZE) { |
| 242 | DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", |
| 243 | count, MAX_BLOCKSIZE); |
| 244 | PRINT_ERR("Invalid block size (%d > %d) given.\n", |
| 245 | count, MAX_BLOCKSIZE); |
| 246 | return -EINVAL; |
| 247 | } |
| 248 | |
| 249 | /* Allocate a new idal buffer. */ |
| 250 | new = idal_buffer_alloc(count, 0); |
| 251 | if (new == NULL) |
| 252 | return -ENOMEM; |
| 253 | if (device->char_data.idal_buf != NULL) |
| 254 | idal_buffer_free(device->char_data.idal_buf); |
| 255 | device->char_data.idal_buf = new; |
| 256 | device->char_data.block_size = count; |
| 257 | |
| 258 | DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * MTRESET: Set block size to 0. |
| 265 | */ |
| 266 | int |
| 267 | tape_std_mtreset(struct tape_device *device, int count) |
| 268 | { |
| 269 | DBF_EVENT(6, "TCHAR:devreset:\n"); |
| 270 | device->char_data.block_size = 0; |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * MTFSF: Forward space over 'count' file marks. The tape is positioned |
| 276 | * at the EOT (End of Tape) side of the file mark. |
| 277 | */ |
| 278 | int |
| 279 | tape_std_mtfsf(struct tape_device *device, int mt_count) |
| 280 | { |
| 281 | struct tape_request *request; |
| 282 | struct ccw1 *ccw; |
| 283 | |
| 284 | request = tape_alloc_request(mt_count + 2, 0); |
| 285 | if (IS_ERR(request)) |
| 286 | return PTR_ERR(request); |
| 287 | request->op = TO_FSF; |
| 288 | /* setup ccws */ |
| 289 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 290 | device->modeset_byte); |
| 291 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); |
| 292 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 293 | |
| 294 | /* execute it */ |
| 295 | return tape_do_io_free(device, request); |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * MTFSR: Forward space over 'count' tape blocks (blocksize is set |
| 300 | * via MTSETBLK. |
| 301 | */ |
| 302 | int |
| 303 | tape_std_mtfsr(struct tape_device *device, int mt_count) |
| 304 | { |
| 305 | struct tape_request *request; |
| 306 | struct ccw1 *ccw; |
| 307 | int rc; |
| 308 | |
| 309 | request = tape_alloc_request(mt_count + 2, 0); |
| 310 | if (IS_ERR(request)) |
| 311 | return PTR_ERR(request); |
| 312 | request->op = TO_FSB; |
| 313 | /* setup ccws */ |
| 314 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 315 | device->modeset_byte); |
| 316 | ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); |
| 317 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 318 | |
| 319 | /* execute it */ |
| 320 | rc = tape_do_io(device, request); |
| 321 | if (rc == 0 && request->rescnt > 0) { |
| 322 | DBF_LH(3, "FSR over tapemark\n"); |
| 323 | rc = 1; |
| 324 | } |
| 325 | tape_free_request(request); |
| 326 | |
| 327 | return rc; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * MTBSR: Backward space over 'count' tape blocks. |
| 332 | * (blocksize is set via MTSETBLK. |
| 333 | */ |
| 334 | int |
| 335 | tape_std_mtbsr(struct tape_device *device, int mt_count) |
| 336 | { |
| 337 | struct tape_request *request; |
| 338 | struct ccw1 *ccw; |
| 339 | int rc; |
| 340 | |
| 341 | request = tape_alloc_request(mt_count + 2, 0); |
| 342 | if (IS_ERR(request)) |
| 343 | return PTR_ERR(request); |
| 344 | request->op = TO_BSB; |
| 345 | /* setup ccws */ |
| 346 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 347 | device->modeset_byte); |
| 348 | ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); |
| 349 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 350 | |
| 351 | /* execute it */ |
| 352 | rc = tape_do_io(device, request); |
| 353 | if (rc == 0 && request->rescnt > 0) { |
| 354 | DBF_LH(3, "BSR over tapemark\n"); |
| 355 | rc = 1; |
| 356 | } |
| 357 | tape_free_request(request); |
| 358 | |
| 359 | return rc; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * MTWEOF: Write 'count' file marks at the current position. |
| 364 | */ |
| 365 | int |
| 366 | tape_std_mtweof(struct tape_device *device, int mt_count) |
| 367 | { |
| 368 | struct tape_request *request; |
| 369 | struct ccw1 *ccw; |
| 370 | |
| 371 | request = tape_alloc_request(mt_count + 2, 0); |
| 372 | if (IS_ERR(request)) |
| 373 | return PTR_ERR(request); |
| 374 | request->op = TO_WTM; |
| 375 | /* setup ccws */ |
| 376 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 377 | device->modeset_byte); |
| 378 | ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); |
| 379 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 380 | |
| 381 | /* execute it */ |
| 382 | return tape_do_io_free(device, request); |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * MTBSFM: Backward space over 'count' file marks. |
| 387 | * The tape is positioned at the BOT (Begin Of Tape) side of the |
| 388 | * last skipped file mark. |
| 389 | */ |
| 390 | int |
| 391 | tape_std_mtbsfm(struct tape_device *device, int mt_count) |
| 392 | { |
| 393 | struct tape_request *request; |
| 394 | struct ccw1 *ccw; |
| 395 | |
| 396 | request = tape_alloc_request(mt_count + 2, 0); |
| 397 | if (IS_ERR(request)) |
| 398 | return PTR_ERR(request); |
| 399 | request->op = TO_BSF; |
| 400 | /* setup ccws */ |
| 401 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 402 | device->modeset_byte); |
| 403 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); |
| 404 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 405 | |
| 406 | /* execute it */ |
| 407 | return tape_do_io_free(device, request); |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * MTBSF: Backward space over 'count' file marks. The tape is positioned at |
| 412 | * the EOT (End of Tape) side of the last skipped file mark. |
| 413 | */ |
| 414 | int |
| 415 | tape_std_mtbsf(struct tape_device *device, int mt_count) |
| 416 | { |
| 417 | struct tape_request *request; |
| 418 | struct ccw1 *ccw; |
| 419 | int rc; |
| 420 | |
| 421 | request = tape_alloc_request(mt_count + 2, 0); |
| 422 | if (IS_ERR(request)) |
| 423 | return PTR_ERR(request); |
| 424 | request->op = TO_BSF; |
| 425 | /* setup ccws */ |
| 426 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 427 | device->modeset_byte); |
| 428 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); |
| 429 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 430 | /* execute it */ |
| 431 | rc = tape_do_io_free(device, request); |
| 432 | if (rc == 0) { |
| 433 | rc = tape_mtop(device, MTFSR, 1); |
| 434 | if (rc > 0) |
| 435 | rc = 0; |
| 436 | } |
| 437 | return rc; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * MTFSFM: Forward space over 'count' file marks. |
| 442 | * The tape is positioned at the BOT (Begin Of Tape) side |
| 443 | * of the last skipped file mark. |
| 444 | */ |
| 445 | int |
| 446 | tape_std_mtfsfm(struct tape_device *device, int mt_count) |
| 447 | { |
| 448 | struct tape_request *request; |
| 449 | struct ccw1 *ccw; |
| 450 | int rc; |
| 451 | |
| 452 | request = tape_alloc_request(mt_count + 2, 0); |
| 453 | if (IS_ERR(request)) |
| 454 | return PTR_ERR(request); |
| 455 | request->op = TO_FSF; |
| 456 | /* setup ccws */ |
| 457 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 458 | device->modeset_byte); |
| 459 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); |
| 460 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); |
| 461 | /* execute it */ |
| 462 | rc = tape_do_io_free(device, request); |
| 463 | if (rc == 0) { |
| 464 | rc = tape_mtop(device, MTBSR, 1); |
| 465 | if (rc > 0) |
| 466 | rc = 0; |
| 467 | } |
| 468 | |
| 469 | return rc; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * MTREW: Rewind the tape. |
| 474 | */ |
| 475 | int |
| 476 | tape_std_mtrew(struct tape_device *device, int mt_count) |
| 477 | { |
| 478 | struct tape_request *request; |
| 479 | |
| 480 | request = tape_alloc_request(3, 0); |
| 481 | if (IS_ERR(request)) |
| 482 | return PTR_ERR(request); |
| 483 | request->op = TO_REW; |
| 484 | /* setup ccws */ |
| 485 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, |
| 486 | device->modeset_byte); |
| 487 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); |
| 488 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 489 | |
| 490 | /* execute it */ |
| 491 | return tape_do_io_free(device, request); |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * MTOFFL: Rewind the tape and put the drive off-line. |
| 496 | * Implement 'rewind unload' |
| 497 | */ |
| 498 | int |
| 499 | tape_std_mtoffl(struct tape_device *device, int mt_count) |
| 500 | { |
| 501 | struct tape_request *request; |
| 502 | |
| 503 | request = tape_alloc_request(3, 0); |
| 504 | if (IS_ERR(request)) |
| 505 | return PTR_ERR(request); |
| 506 | request->op = TO_RUN; |
| 507 | /* setup ccws */ |
| 508 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 509 | tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); |
| 510 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); |
| 511 | |
| 512 | /* execute it */ |
| 513 | return tape_do_io_free(device, request); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * MTNOP: 'No operation'. |
| 518 | */ |
| 519 | int |
| 520 | tape_std_mtnop(struct tape_device *device, int mt_count) |
| 521 | { |
| 522 | struct tape_request *request; |
| 523 | |
| 524 | request = tape_alloc_request(2, 0); |
| 525 | if (IS_ERR(request)) |
| 526 | return PTR_ERR(request); |
| 527 | request->op = TO_NOP; |
| 528 | /* setup ccws */ |
| 529 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 530 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 531 | /* execute it */ |
| 532 | return tape_do_io_free(device, request); |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * MTEOM: positions at the end of the portion of the tape already used |
| 537 | * for recordind data. MTEOM positions after the last file mark, ready for |
| 538 | * appending another file. |
| 539 | */ |
| 540 | int |
| 541 | tape_std_mteom(struct tape_device *device, int mt_count) |
| 542 | { |
| 543 | int rc; |
| 544 | |
| 545 | /* |
| 546 | * Seek from the beginning of tape (rewind). |
| 547 | */ |
| 548 | if ((rc = tape_mtop(device, MTREW, 1)) < 0) |
| 549 | return rc; |
| 550 | |
| 551 | /* |
| 552 | * The logical end of volume is given by two sewuential tapemarks. |
| 553 | * Look for this by skipping to the next file (over one tapemark) |
| 554 | * and then test for another one (fsr returns 1 if a tapemark was |
| 555 | * encountered). |
| 556 | */ |
| 557 | do { |
| 558 | if ((rc = tape_mtop(device, MTFSF, 1)) < 0) |
| 559 | return rc; |
| 560 | if ((rc = tape_mtop(device, MTFSR, 1)) < 0) |
| 561 | return rc; |
| 562 | } while (rc == 0); |
| 563 | |
| 564 | return tape_mtop(device, MTBSR, 1); |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. |
| 569 | */ |
| 570 | int |
| 571 | tape_std_mtreten(struct tape_device *device, int mt_count) |
| 572 | { |
| 573 | struct tape_request *request; |
| 574 | int rc; |
| 575 | |
| 576 | request = tape_alloc_request(4, 0); |
| 577 | if (IS_ERR(request)) |
| 578 | return PTR_ERR(request); |
| 579 | request->op = TO_FSF; |
| 580 | /* setup ccws */ |
| 581 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 582 | tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); |
| 583 | tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); |
| 584 | tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); |
| 585 | /* execute it, MTRETEN rc gets ignored */ |
| 586 | rc = tape_do_io_interruptible(device, request); |
| 587 | tape_free_request(request); |
| 588 | return tape_mtop(device, MTREW, 1); |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * MTERASE: erases the tape. |
| 593 | */ |
| 594 | int |
| 595 | tape_std_mterase(struct tape_device *device, int mt_count) |
| 596 | { |
| 597 | struct tape_request *request; |
| 598 | |
| 599 | request = tape_alloc_request(6, 0); |
| 600 | if (IS_ERR(request)) |
| 601 | return PTR_ERR(request); |
| 602 | request->op = TO_DSE; |
| 603 | /* setup ccws */ |
| 604 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 605 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); |
| 606 | tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); |
| 607 | tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); |
| 608 | tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); |
| 609 | tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); |
| 610 | |
| 611 | /* execute it */ |
| 612 | return tape_do_io_free(device, request); |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * MTUNLOAD: Rewind the tape and unload it. |
| 617 | */ |
| 618 | int |
| 619 | tape_std_mtunload(struct tape_device *device, int mt_count) |
| 620 | { |
| 621 | return tape_mtop(device, MTOFFL, mt_count); |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * MTCOMPRESSION: used to enable compression. |
| 626 | * Sets the IDRC on/off. |
| 627 | */ |
| 628 | int |
| 629 | tape_std_mtcompression(struct tape_device *device, int mt_count) |
| 630 | { |
| 631 | struct tape_request *request; |
| 632 | |
| 633 | if (mt_count < 0 || mt_count > 1) { |
| 634 | DBF_EXCEPTION(6, "xcom parm\n"); |
| 635 | if (*device->modeset_byte & 0x08) |
| 636 | PRINT_INFO("(%s) Compression is currently on\n", |
| 637 | device->cdev->dev.bus_id); |
| 638 | else |
| 639 | PRINT_INFO("(%s) Compression is currently off\n", |
| 640 | device->cdev->dev.bus_id); |
| 641 | PRINT_INFO("Use 1 to switch compression on, 0 to " |
| 642 | "switch it off\n"); |
| 643 | return -EINVAL; |
| 644 | } |
| 645 | request = tape_alloc_request(2, 0); |
| 646 | if (IS_ERR(request)) |
| 647 | return PTR_ERR(request); |
| 648 | request->op = TO_NOP; |
| 649 | /* setup ccws */ |
| 650 | *device->modeset_byte = (mt_count == 0) ? 0x00 : 0x08; |
| 651 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 652 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); |
| 653 | /* execute it */ |
| 654 | return tape_do_io_free(device, request); |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Read Block |
| 659 | */ |
| 660 | struct tape_request * |
| 661 | tape_std_read_block(struct tape_device *device, size_t count) |
| 662 | { |
| 663 | struct tape_request *request; |
| 664 | |
| 665 | /* |
| 666 | * We have to alloc 4 ccws in order to be able to transform request |
| 667 | * into a read backward request in error case. |
| 668 | */ |
| 669 | request = tape_alloc_request(4, 0); |
| 670 | if (IS_ERR(request)) { |
| 671 | DBF_EXCEPTION(6, "xrbl fail"); |
| 672 | return request; |
| 673 | } |
| 674 | request->op = TO_RFO; |
| 675 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 676 | tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, |
| 677 | device->char_data.idal_buf); |
| 678 | DBF_EVENT(6, "xrbl ccwg\n"); |
| 679 | return request; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Read Block backward transformation function. |
| 684 | */ |
| 685 | void |
| 686 | tape_std_read_backward(struct tape_device *device, struct tape_request *request) |
| 687 | { |
| 688 | /* |
| 689 | * We have allocated 4 ccws in tape_std_read, so we can now |
| 690 | * transform the request to a read backward, followed by a |
| 691 | * forward space block. |
| 692 | */ |
| 693 | request->op = TO_RBA; |
| 694 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 695 | tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, |
| 696 | device->char_data.idal_buf); |
| 697 | tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); |
| 698 | tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); |
| 699 | DBF_EVENT(6, "xrop ccwg");} |
| 700 | |
| 701 | /* |
| 702 | * Write Block |
| 703 | */ |
| 704 | struct tape_request * |
| 705 | tape_std_write_block(struct tape_device *device, size_t count) |
| 706 | { |
| 707 | struct tape_request *request; |
| 708 | |
| 709 | request = tape_alloc_request(2, 0); |
| 710 | if (IS_ERR(request)) { |
| 711 | DBF_EXCEPTION(6, "xwbl fail\n"); |
| 712 | return request; |
| 713 | } |
| 714 | request->op = TO_WRI; |
| 715 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
| 716 | tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, |
| 717 | device->char_data.idal_buf); |
| 718 | DBF_EVENT(6, "xwbl ccwg\n"); |
| 719 | return request; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * This routine is called by frontend after an ENOSP on write |
| 724 | */ |
| 725 | void |
| 726 | tape_std_process_eov(struct tape_device *device) |
| 727 | { |
| 728 | /* |
| 729 | * End of volume: We have to backspace the last written record, then |
| 730 | * we TRY to write a tapemark and then backspace over the written TM |
| 731 | */ |
| 732 | if (tape_mtop(device, MTBSR, 1) == 0 && |
| 733 | tape_mtop(device, MTWEOF, 1) == 0) { |
| 734 | tape_mtop(device, MTBSR, 1); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | EXPORT_SYMBOL(tape_std_assign); |
| 739 | EXPORT_SYMBOL(tape_std_unassign); |
| 740 | EXPORT_SYMBOL(tape_std_display); |
| 741 | EXPORT_SYMBOL(tape_std_read_block_id); |
| 742 | EXPORT_SYMBOL(tape_std_mtload); |
| 743 | EXPORT_SYMBOL(tape_std_mtsetblk); |
| 744 | EXPORT_SYMBOL(tape_std_mtreset); |
| 745 | EXPORT_SYMBOL(tape_std_mtfsf); |
| 746 | EXPORT_SYMBOL(tape_std_mtfsr); |
| 747 | EXPORT_SYMBOL(tape_std_mtbsr); |
| 748 | EXPORT_SYMBOL(tape_std_mtweof); |
| 749 | EXPORT_SYMBOL(tape_std_mtbsfm); |
| 750 | EXPORT_SYMBOL(tape_std_mtbsf); |
| 751 | EXPORT_SYMBOL(tape_std_mtfsfm); |
| 752 | EXPORT_SYMBOL(tape_std_mtrew); |
| 753 | EXPORT_SYMBOL(tape_std_mtoffl); |
| 754 | EXPORT_SYMBOL(tape_std_mtnop); |
| 755 | EXPORT_SYMBOL(tape_std_mteom); |
| 756 | EXPORT_SYMBOL(tape_std_mtreten); |
| 757 | EXPORT_SYMBOL(tape_std_mterase); |
| 758 | EXPORT_SYMBOL(tape_std_mtunload); |
| 759 | EXPORT_SYMBOL(tape_std_mtcompression); |
| 760 | EXPORT_SYMBOL(tape_std_read_block); |
| 761 | EXPORT_SYMBOL(tape_std_read_backward); |
| 762 | EXPORT_SYMBOL(tape_std_write_block); |
| 763 | EXPORT_SYMBOL(tape_std_process_eov); |