1 ============================== 1 ==============================
2 Summary of `HDIO_` ioctl calls 2 Summary of `HDIO_` ioctl calls
3 ============================== 3 ==============================
4 4
5 - Edward A. Falk <efalk@google.com> 5 - Edward A. Falk <efalk@google.com>
6 6
7 November, 2004 7 November, 2004
8 8
9 This document attempts to describe the ioctl(2 9 This document attempts to describe the ioctl(2) calls supported by
10 the HD/IDE layer. These are by-and-large impl !! 10 the HD/IDE layer. These are by-and-large implemented (as of Linux 2.6)
11 drivers/ata/libata-scsi.c. !! 11 in drivers/ide/ide.c and drivers/block/scsi_ioctl.c
12 12
13 ioctl values are listed in <linux/hdreg.h>. A 13 ioctl values are listed in <linux/hdreg.h>. As of this writing, they
14 are as follows: 14 are as follows:
15 15
16 ioctls that pass argument pointers to user 16 ioctls that pass argument pointers to user space:
17 17
18 ======================= ============== 18 ======================= =======================================
19 HDIO_GETGEO get device geo 19 HDIO_GETGEO get device geometry
>> 20 HDIO_GET_UNMASKINTR get current unmask setting
>> 21 HDIO_GET_MULTCOUNT get current IDE blockmode setting
>> 22 HDIO_GET_QDMA get use-qdma flag
>> 23 HDIO_SET_XFER set transfer rate via proc
>> 24 HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE
>> 25 HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag
20 HDIO_GET_32BIT get current io 26 HDIO_GET_32BIT get current io_32bit setting
>> 27 HDIO_GET_NOWERR get ignore-write-error flag
>> 28 HDIO_GET_DMA get use-dma flag
>> 29 HDIO_GET_NICE get nice flags
21 HDIO_GET_IDENTITY get IDE identi 30 HDIO_GET_IDENTITY get IDE identification info
>> 31 HDIO_GET_WCACHE get write cache mode on|off
>> 32 HDIO_GET_ACOUSTIC get acoustic value
>> 33 HDIO_GET_ADDRESS get sector addressing mode
>> 34 HDIO_GET_BUSSTATE get the bus state of the hwif
>> 35 HDIO_TRISTATE_HWIF execute a channel tristate
>> 36 HDIO_DRIVE_RESET execute a device reset
22 HDIO_DRIVE_TASKFILE execute raw ta 37 HDIO_DRIVE_TASKFILE execute raw taskfile
23 HDIO_DRIVE_TASK execute task a 38 HDIO_DRIVE_TASK execute task and special drive command
24 HDIO_DRIVE_CMD execute a spec 39 HDIO_DRIVE_CMD execute a special drive command
>> 40 HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK
25 ======================= ============== 41 ======================= =======================================
26 42
27 ioctls that pass non-pointer values: 43 ioctls that pass non-pointer values:
28 44
29 ======================= ============== 45 ======================= =======================================
>> 46 HDIO_SET_MULTCOUNT change IDE blockmode
>> 47 HDIO_SET_UNMASKINTR permit other irqs during I/O
>> 48 HDIO_SET_KEEPSETTINGS keep ioctl settings on reset
30 HDIO_SET_32BIT change io_32bi 49 HDIO_SET_32BIT change io_32bit flags
>> 50 HDIO_SET_NOWERR change ignore-write-error flag
>> 51 HDIO_SET_DMA change use-dma flag
>> 52 HDIO_SET_PIO_MODE reconfig interface to new speed
>> 53 HDIO_SCAN_HWIF register and (re)scan interface
>> 54 HDIO_SET_NICE set nice flags
>> 55 HDIO_UNREGISTER_HWIF unregister interface
>> 56 HDIO_SET_WCACHE change write cache enable-disable
>> 57 HDIO_SET_ACOUSTIC change acoustic behavior
>> 58 HDIO_SET_BUSSTATE set the bus state of the hwif
>> 59 HDIO_SET_QDMA change use-qdma flag
>> 60 HDIO_SET_ADDRESS change lba addressing modes
>> 61
>> 62 HDIO_SET_IDE_SCSI Set scsi emulation mode on/off
>> 63 HDIO_SET_SCSI_IDE not implemented yet
31 ======================= ============== 64 ======================= =======================================
32 65
33 66
34 The information that follows was determined fr 67 The information that follows was determined from reading kernel source
35 code. It is likely that some corrections will 68 code. It is likely that some corrections will be made over time.
36 69
37 ---------------------------------------------- 70 ------------------------------------------------------------------------------
38 71
39 General: 72 General:
40 73
41 Unless otherwise specified, all ioctl 74 Unless otherwise specified, all ioctl calls return 0 on success
42 and -1 with errno set to an appropriat 75 and -1 with errno set to an appropriate value on error.
43 76
44 Unless otherwise specified, all ioctl 77 Unless otherwise specified, all ioctl calls return -1 and set
45 errno to EFAULT on a failed attempt to 78 errno to EFAULT on a failed attempt to copy data to or from user
46 address space. 79 address space.
47 80
48 Unless otherwise specified, all data s 81 Unless otherwise specified, all data structures and constants
49 are defined in <linux/hdreg.h> 82 are defined in <linux/hdreg.h>
50 83
51 ---------------------------------------------- 84 ------------------------------------------------------------------------------
52 85
53 HDIO_GETGEO 86 HDIO_GETGEO
54 get device geometry 87 get device geometry
55 88
56 89
57 usage:: 90 usage::
58 91
59 struct hd_geometry geom; 92 struct hd_geometry geom;
60 93
61 ioctl(fd, HDIO_GETGEO, &geom); 94 ioctl(fd, HDIO_GETGEO, &geom);
62 95
63 96
64 inputs: 97 inputs:
65 none 98 none
66 99
67 100
68 101
69 outputs: 102 outputs:
70 hd_geometry structure containi 103 hd_geometry structure containing:
71 104
72 105
73 ========= ====================== 106 ========= ==================================
74 heads number of heads 107 heads number of heads
75 sectors number of sectors/trac 108 sectors number of sectors/track
76 cylinders number of cylinders, m 109 cylinders number of cylinders, mod 65536
77 start starting sector of thi 110 start starting sector of this partition.
78 ========= ====================== 111 ========= ==================================
79 112
80 113
81 error returns: 114 error returns:
82 - EINVAL 115 - EINVAL
83 116
84 if the device is not a 117 if the device is not a disk drive or floppy drive,
85 or if the user passes 118 or if the user passes a null pointer
86 119
87 120
88 notes: 121 notes:
89 Not particularly useful with m 122 Not particularly useful with modern disk drives, whose geometry
90 is a polite fiction anyway. M 123 is a polite fiction anyway. Modern drives are addressed
91 purely by sector number nowada 124 purely by sector number nowadays (lba addressing), and the
92 drive geometry is an abstracti 125 drive geometry is an abstraction which is actually subject
93 to change. Currently (as of N 126 to change. Currently (as of Nov 2004), the geometry values
94 are the "bios" values -- presu 127 are the "bios" values -- presumably the values the drive had
95 when Linux first booted. 128 when Linux first booted.
96 129
97 In addition, the cylinders fie 130 In addition, the cylinders field of the hd_geometry is an
98 unsigned short, meaning that o 131 unsigned short, meaning that on most architectures, this
99 ioctl will not return a meanin 132 ioctl will not return a meaningful value on drives with more
100 than 65535 tracks. 133 than 65535 tracks.
101 134
102 The start field is unsigned lo 135 The start field is unsigned long, meaning that it will not
103 contain a meaningful value for 136 contain a meaningful value for disks over 219 Gb in size.
104 137
105 138
106 139
>> 140
>> 141 HDIO_GET_UNMASKINTR
>> 142 get current unmask setting
>> 143
>> 144
>> 145 usage::
>> 146
>> 147 long val;
>> 148
>> 149 ioctl(fd, HDIO_GET_UNMASKINTR, &val);
>> 150
>> 151 inputs:
>> 152 none
>> 153
>> 154
>> 155
>> 156 outputs:
>> 157 The value of the drive's current unmask setting
>> 158
>> 159
>> 160
>> 161
>> 162
>> 163 HDIO_SET_UNMASKINTR
>> 164 permit other irqs during I/O
>> 165
>> 166
>> 167 usage::
>> 168
>> 169 unsigned long val;
>> 170
>> 171 ioctl(fd, HDIO_SET_UNMASKINTR, val);
>> 172
>> 173 inputs:
>> 174 New value for unmask flag
>> 175
>> 176
>> 177
>> 178 outputs:
>> 179 none
>> 180
>> 181
>> 182
>> 183 error return:
>> 184 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 185 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 186 - EINVAL value out of range [0 1]
>> 187 - EBUSY Controller busy
>> 188
>> 189
>> 190
>> 191
>> 192 HDIO_GET_MULTCOUNT
>> 193 get current IDE blockmode setting
>> 194
>> 195
>> 196 usage::
>> 197
>> 198 long val;
>> 199
>> 200 ioctl(fd, HDIO_GET_MULTCOUNT, &val);
>> 201
>> 202 inputs:
>> 203 none
>> 204
>> 205
>> 206
>> 207 outputs:
>> 208 The value of the current IDE block mode setting. This
>> 209 controls how many sectors the drive will transfer per
>> 210 interrupt.
>> 211
>> 212
>> 213
>> 214 HDIO_SET_MULTCOUNT
>> 215 change IDE blockmode
>> 216
>> 217
>> 218 usage::
>> 219
>> 220 int val;
>> 221
>> 222 ioctl(fd, HDIO_SET_MULTCOUNT, val);
>> 223
>> 224 inputs:
>> 225 New value for IDE block mode setting. This controls how many
>> 226 sectors the drive will transfer per interrupt.
>> 227
>> 228 outputs:
>> 229 none
>> 230
>> 231
>> 232
>> 233 error return:
>> 234 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 235 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 236 - EINVAL value out of range supported by disk.
>> 237 - EBUSY Controller busy or blockmode already set.
>> 238 - EIO Drive did not accept new block mode.
>> 239
>> 240 notes:
>> 241 Source code comments read::
>> 242
>> 243 This is tightly woven into the driver->do_special cannot
>> 244 touch. DON'T do it again until a total personality rewrite
>> 245 is committed.
>> 246
>> 247 If blockmode has already been set, this ioctl will fail with
>> 248 -EBUSY
>> 249
>> 250
>> 251
>> 252 HDIO_GET_QDMA
>> 253 get use-qdma flag
>> 254
>> 255
>> 256 Not implemented, as of 2.6.8.1
>> 257
>> 258
>> 259
>> 260 HDIO_SET_XFER
>> 261 set transfer rate via proc
>> 262
>> 263
>> 264 Not implemented, as of 2.6.8.1
>> 265
>> 266
>> 267
>> 268 HDIO_OBSOLETE_IDENTITY
>> 269 OBSOLETE, DO NOT USE
>> 270
>> 271
>> 272 Same as HDIO_GET_IDENTITY (see below), except that it only
>> 273 returns the first 142 bytes of drive identity information.
>> 274
>> 275
>> 276
107 HDIO_GET_IDENTITY 277 HDIO_GET_IDENTITY
108 get IDE identification info 278 get IDE identification info
109 279
110 280
111 usage:: 281 usage::
112 282
113 unsigned char identity[512]; 283 unsigned char identity[512];
114 284
115 ioctl(fd, HDIO_GET_IDENTITY, identit 285 ioctl(fd, HDIO_GET_IDENTITY, identity);
116 286
117 inputs: 287 inputs:
118 none 288 none
119 289
120 290
121 291
122 outputs: 292 outputs:
123 ATA drive identity information 293 ATA drive identity information. For full description, see
124 the IDENTIFY DEVICE and IDENTI 294 the IDENTIFY DEVICE and IDENTIFY PACKET DEVICE commands in
125 the ATA specification. 295 the ATA specification.
126 296
127 error returns: 297 error returns:
128 - EINVAL Called on a partition !! 298 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
129 - ENOMSG IDENTIFY DEVICE inform 299 - ENOMSG IDENTIFY DEVICE information not available
130 300
131 notes: 301 notes:
132 Returns information that was o 302 Returns information that was obtained when the drive was
133 probed. Some of this informat 303 probed. Some of this information is subject to change, and
134 this ioctl does not re-probe t 304 this ioctl does not re-probe the drive to update the
135 information. 305 information.
136 306
137 This information is also avail 307 This information is also available from /proc/ide/hdX/identify
138 308
139 309
140 310
>> 311 HDIO_GET_KEEPSETTINGS
>> 312 get keep-settings-on-reset flag
>> 313
>> 314
>> 315 usage::
>> 316
>> 317 long val;
>> 318
>> 319 ioctl(fd, HDIO_GET_KEEPSETTINGS, &val);
>> 320
>> 321 inputs:
>> 322 none
>> 323
>> 324
>> 325
>> 326 outputs:
>> 327 The value of the current "keep settings" flag
>> 328
>> 329
>> 330
>> 331 notes:
>> 332 When set, indicates that kernel should restore settings
>> 333 after a drive reset.
>> 334
>> 335
>> 336
>> 337 HDIO_SET_KEEPSETTINGS
>> 338 keep ioctl settings on reset
>> 339
>> 340
>> 341 usage::
>> 342
>> 343 long val;
>> 344
>> 345 ioctl(fd, HDIO_SET_KEEPSETTINGS, val);
>> 346
>> 347 inputs:
>> 348 New value for keep_settings flag
>> 349
>> 350
>> 351
>> 352 outputs:
>> 353 none
>> 354
>> 355
>> 356
>> 357 error return:
>> 358 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 359 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 360 - EINVAL value out of range [0 1]
>> 361 - EBUSY Controller busy
>> 362
>> 363
>> 364
141 HDIO_GET_32BIT 365 HDIO_GET_32BIT
142 get current io_32bit setting 366 get current io_32bit setting
143 367
144 368
145 usage:: 369 usage::
146 370
147 long val; 371 long val;
148 372
149 ioctl(fd, HDIO_GET_32BIT, &val); 373 ioctl(fd, HDIO_GET_32BIT, &val);
150 374
151 inputs: 375 inputs:
152 none 376 none
153 377
154 378
155 379
156 outputs: 380 outputs:
157 The value of the current io_32 381 The value of the current io_32bit setting
158 382
159 383
160 384
161 notes: 385 notes:
162 0=16-bit, 1=32-bit, 2,3 = 32bi 386 0=16-bit, 1=32-bit, 2,3 = 32bit+sync
163 387
164 388
165 389
>> 390
>> 391
>> 392 HDIO_GET_NOWERR
>> 393 get ignore-write-error flag
>> 394
>> 395
>> 396 usage::
>> 397
>> 398 long val;
>> 399
>> 400 ioctl(fd, HDIO_GET_NOWERR, &val);
>> 401
>> 402 inputs:
>> 403 none
>> 404
>> 405
>> 406
>> 407 outputs:
>> 408 The value of the current ignore-write-error flag
>> 409
>> 410
>> 411
>> 412
>> 413
>> 414 HDIO_GET_DMA
>> 415 get use-dma flag
>> 416
>> 417
>> 418 usage::
>> 419
>> 420 long val;
>> 421
>> 422 ioctl(fd, HDIO_GET_DMA, &val);
>> 423
>> 424 inputs:
>> 425 none
>> 426
>> 427
>> 428
>> 429 outputs:
>> 430 The value of the current use-dma flag
>> 431
>> 432
>> 433
>> 434
>> 435
>> 436 HDIO_GET_NICE
>> 437 get nice flags
>> 438
>> 439
>> 440 usage::
>> 441
>> 442 long nice;
>> 443
>> 444 ioctl(fd, HDIO_GET_NICE, &nice);
>> 445
>> 446 inputs:
>> 447 none
>> 448
>> 449
>> 450
>> 451 outputs:
>> 452 The drive's "nice" values.
>> 453
>> 454
>> 455
>> 456 notes:
>> 457 Per-drive flags which determine when the system will give more
>> 458 bandwidth to other devices sharing the same IDE bus.
>> 459
>> 460 See <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP.
>> 461
>> 462
>> 463
>> 464
>> 465 HDIO_SET_NICE
>> 466 set nice flags
>> 467
>> 468
>> 469 usage::
>> 470
>> 471 unsigned long nice;
>> 472
>> 473 ...
>> 474 ioctl(fd, HDIO_SET_NICE, nice);
>> 475
>> 476 inputs:
>> 477 bitmask of nice flags.
>> 478
>> 479
>> 480
>> 481 outputs:
>> 482 none
>> 483
>> 484
>> 485
>> 486 error returns:
>> 487 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 488 - EPERM Flags other than DSC_OVERLAP and NICE_1 set.
>> 489 - EPERM DSC_OVERLAP specified but not supported by drive
>> 490
>> 491 notes:
>> 492 This ioctl sets the DSC_OVERLAP and NICE_1 flags from values
>> 493 provided by the user.
>> 494
>> 495 Nice flags are listed in <linux/hdreg.h>, starting with
>> 496 IDE_NICE_DSC_OVERLAP. These values represent shifts.
>> 497
>> 498
>> 499
>> 500
>> 501
>> 502 HDIO_GET_WCACHE
>> 503 get write cache mode on|off
>> 504
>> 505
>> 506 usage::
>> 507
>> 508 long val;
>> 509
>> 510 ioctl(fd, HDIO_GET_WCACHE, &val);
>> 511
>> 512 inputs:
>> 513 none
>> 514
>> 515
>> 516
>> 517 outputs:
>> 518 The value of the current write cache mode
>> 519
>> 520
>> 521
>> 522
>> 523
>> 524 HDIO_GET_ACOUSTIC
>> 525 get acoustic value
>> 526
>> 527
>> 528 usage::
>> 529
>> 530 long val;
>> 531
>> 532 ioctl(fd, HDIO_GET_ACOUSTIC, &val);
>> 533
>> 534 inputs:
>> 535 none
>> 536
>> 537
>> 538
>> 539 outputs:
>> 540 The value of the current acoustic settings
>> 541
>> 542
>> 543
>> 544 notes:
>> 545 See HDIO_SET_ACOUSTIC
>> 546
>> 547
>> 548
>> 549
>> 550
>> 551 HDIO_GET_ADDRESS
>> 552 usage::
>> 553
>> 554
>> 555 long val;
>> 556
>> 557 ioctl(fd, HDIO_GET_ADDRESS, &val);
>> 558
>> 559 inputs:
>> 560 none
>> 561
>> 562
>> 563
>> 564 outputs:
>> 565 The value of the current addressing mode:
>> 566
>> 567 = ===================
>> 568 0 28-bit
>> 569 1 48-bit
>> 570 2 48-bit doing 28-bit
>> 571 3 64-bit
>> 572 = ===================
>> 573
>> 574
>> 575
>> 576 HDIO_GET_BUSSTATE
>> 577 get the bus state of the hwif
>> 578
>> 579
>> 580 usage::
>> 581
>> 582 long state;
>> 583
>> 584 ioctl(fd, HDIO_SCAN_HWIF, &state);
>> 585
>> 586 inputs:
>> 587 none
>> 588
>> 589
>> 590
>> 591 outputs:
>> 592 Current power state of the IDE bus. One of BUSSTATE_OFF,
>> 593 BUSSTATE_ON, or BUSSTATE_TRISTATE
>> 594
>> 595 error returns:
>> 596 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 597
>> 598
>> 599
>> 600
>> 601 HDIO_SET_BUSSTATE
>> 602 set the bus state of the hwif
>> 603
>> 604
>> 605 usage::
>> 606
>> 607 int state;
>> 608
>> 609 ...
>> 610 ioctl(fd, HDIO_SCAN_HWIF, state);
>> 611
>> 612 inputs:
>> 613 Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON,
>> 614 or BUSSTATE_TRISTATE
>> 615
>> 616 outputs:
>> 617 none
>> 618
>> 619
>> 620
>> 621 error returns:
>> 622 - EACCES Access denied: requires CAP_SYS_RAWIO
>> 623 - EOPNOTSUPP Hardware interface does not support bus power control
>> 624
>> 625
>> 626
>> 627
>> 628 HDIO_TRISTATE_HWIF
>> 629 execute a channel tristate
>> 630
>> 631
>> 632 Not implemented, as of 2.6.8.1. See HDIO_SET_BUSSTATE
>> 633
>> 634
>> 635
>> 636 HDIO_DRIVE_RESET
>> 637 execute a device reset
>> 638
>> 639
>> 640 usage::
>> 641
>> 642 int args[3]
>> 643
>> 644 ...
>> 645 ioctl(fd, HDIO_DRIVE_RESET, args);
>> 646
>> 647 inputs:
>> 648 none
>> 649
>> 650
>> 651
>> 652 outputs:
>> 653 none
>> 654
>> 655
>> 656
>> 657 error returns:
>> 658 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 659 - ENXIO No such device: phy dead or ctl_addr == 0
>> 660 - EIO I/O error: reset timed out or hardware error
>> 661
>> 662 notes:
>> 663
>> 664 - Execute a reset on the device as soon as the current IO
>> 665 operation has completed.
>> 666
>> 667 - Executes an ATAPI soft reset if applicable, otherwise
>> 668 executes an ATA soft reset on the controller.
>> 669
>> 670
>> 671
166 HDIO_DRIVE_TASKFILE 672 HDIO_DRIVE_TASKFILE
167 execute raw taskfile 673 execute raw taskfile
168 674
169 675
170 Note: 676 Note:
171 If you don't have a copy of th 677 If you don't have a copy of the ANSI ATA specification
172 handy, you should probably ign 678 handy, you should probably ignore this ioctl.
173 679
174 - Execute an ATA disk command directly 680 - Execute an ATA disk command directly by writing the "taskfile"
175 registers of the drive. Requires AD 681 registers of the drive. Requires ADMIN and RAWIO access
176 privileges. 682 privileges.
177 683
178 usage:: 684 usage::
179 685
180 struct { 686 struct {
181 687
182 ide_task_request_t req_task; 688 ide_task_request_t req_task;
183 u8 outbuf[OUTPUT_SIZE]; 689 u8 outbuf[OUTPUT_SIZE];
184 u8 inbuf[INPUT_SIZE]; 690 u8 inbuf[INPUT_SIZE];
185 } task; 691 } task;
186 memset(&task.req_task, 0, sizeof(tas 692 memset(&task.req_task, 0, sizeof(task.req_task));
187 task.req_task.out_size = sizeof(task 693 task.req_task.out_size = sizeof(task.outbuf);
188 task.req_task.in_size = sizeof(task. 694 task.req_task.in_size = sizeof(task.inbuf);
189 ... 695 ...
190 ioctl(fd, HDIO_DRIVE_TASKFILE, &task 696 ioctl(fd, HDIO_DRIVE_TASKFILE, &task);
191 ... 697 ...
192 698
193 inputs: 699 inputs:
194 700
195 (See below for details on memory are 701 (See below for details on memory area passed to ioctl.)
196 702
197 ============ ====================== 703 ============ ===================================================
198 io_ports[8] values to be written t 704 io_ports[8] values to be written to taskfile registers
199 hob_ports[8] high-order bytes, for 705 hob_ports[8] high-order bytes, for extended commands.
200 out_flags flags indicating which 706 out_flags flags indicating which registers are valid
201 in_flags flags indicating which 707 in_flags flags indicating which registers should be returned
202 data_phase see below 708 data_phase see below
203 req_cmd command type to be exe 709 req_cmd command type to be executed
204 out_size size of output buffer 710 out_size size of output buffer
205 outbuf buffer of data to be t 711 outbuf buffer of data to be transmitted to disk
206 inbuf buffer of data to be r 712 inbuf buffer of data to be received from disk (see [1])
207 ============ ====================== 713 ============ ===================================================
208 714
209 outputs: 715 outputs:
210 716
211 =========== ====================== 717 =========== ====================================================
212 io_ports[] values returned in the 718 io_ports[] values returned in the taskfile registers
213 hob_ports[] high-order bytes, for 719 hob_ports[] high-order bytes, for extended commands.
214 out_flags flags indicating which 720 out_flags flags indicating which registers are valid (see [2])
215 in_flags flags indicating which 721 in_flags flags indicating which registers should be returned
216 outbuf buffer of data to be t 722 outbuf buffer of data to be transmitted to disk (see [1])
217 inbuf buffer of data to be r 723 inbuf buffer of data to be received from disk
218 =========== ====================== 724 =========== ====================================================
219 725
220 error returns: 726 error returns:
221 - EACCES CAP_SYS_ADMIN or CAP_S 727 - EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privilege not set.
222 - ENOMSG Device is not a disk d 728 - ENOMSG Device is not a disk drive.
223 - ENOMEM Unable to allocate mem 729 - ENOMEM Unable to allocate memory for task
224 - EFAULT req_cmd == TASKFILE_IN 730 - EFAULT req_cmd == TASKFILE_IN_OUT (not implemented as of 2.6.8)
225 - EPERM 731 - EPERM
226 732
227 req_cmd == TASKFILE_MU 733 req_cmd == TASKFILE_MULTI_OUT and drive
228 multi-count not yet se 734 multi-count not yet set.
229 - EIO Drive failed the comma 735 - EIO Drive failed the command.
230 736
231 notes: 737 notes:
232 738
233 [1] READ THE FOLLOWING NOTES *CAREFU 739 [1] READ THE FOLLOWING NOTES *CAREFULLY*. THIS IOCTL IS
234 FULL OF GOTCHAS. Extreme caution sh 740 FULL OF GOTCHAS. Extreme caution should be used with using
235 this ioctl. A mistake can easily co 741 this ioctl. A mistake can easily corrupt data or hang the
236 system. 742 system.
237 743
238 [2] Both the input and output buffer 744 [2] Both the input and output buffers are copied from the
239 user and written back to the user, e 745 user and written back to the user, even when not used.
240 746
241 [3] If one or more bits are set in o 747 [3] If one or more bits are set in out_flags and in_flags is
242 zero, the following values are used 748 zero, the following values are used for in_flags.all and
243 written back into in_flags on comple 749 written back into in_flags on completion.
244 750
245 * IDE_TASKFILE_STD_IN_FLAGS | (IDE_ 751 * IDE_TASKFILE_STD_IN_FLAGS | (IDE_HOB_STD_IN_FLAGS << 8)
246 if LBA48 addressing is enabled fo 752 if LBA48 addressing is enabled for the drive
247 * IDE_TASKFILE_STD_IN_FLAGS 753 * IDE_TASKFILE_STD_IN_FLAGS
248 if CHS/LBA28 754 if CHS/LBA28
249 755
250 The association between in_flags.all 756 The association between in_flags.all and each enable
251 bitfield flips depending on endianne 757 bitfield flips depending on endianness; fortunately, TASKFILE
252 only uses inflags.b.data bit and ign 758 only uses inflags.b.data bit and ignores all other bits.
253 The end result is that, on any endia 759 The end result is that, on any endian machines, it has no
254 effect other than modifying in_flags 760 effect other than modifying in_flags on completion.
255 761
256 [4] The default value of SELECT is ( 762 [4] The default value of SELECT is (0xa0|DEV_bit|LBA_bit)
257 except for four drives per port chip 763 except for four drives per port chipsets. For four drives
258 per port chipsets, it's (0xa0|DEV_bi 764 per port chipsets, it's (0xa0|DEV_bit|LBA_bit) for the first
259 pair and (0x80|DEV_bit|LBA_bit) for 765 pair and (0x80|DEV_bit|LBA_bit) for the second pair.
260 766
261 [5] The argument to the ioctl is a p 767 [5] The argument to the ioctl is a pointer to a region of
262 memory containing a ide_task_request 768 memory containing a ide_task_request_t structure, followed
263 by an optional buffer of data to be 769 by an optional buffer of data to be transmitted to the
264 drive, followed by an optional buffe 770 drive, followed by an optional buffer to receive data from
265 the drive. 771 the drive.
266 772
267 Command is passed to the disk drive 773 Command is passed to the disk drive via the ide_task_request_t
268 structure, which contains these fiel 774 structure, which contains these fields:
269 775
270 ============ ============== 776 ============ ===============================================
271 io_ports[8] values for the 777 io_ports[8] values for the taskfile registers
272 hob_ports[8] high-order byt 778 hob_ports[8] high-order bytes, for extended commands
273 out_flags flags indicati 779 out_flags flags indicating which entries in the
274 io_ports[] and 780 io_ports[] and hob_ports[] arrays
275 contain valid 781 contain valid values. Type ide_reg_valid_t.
276 in_flags flags indicati 782 in_flags flags indicating which entries in the
277 io_ports[] and 783 io_ports[] and hob_ports[] arrays
278 are expected t 784 are expected to contain valid values
279 on return. 785 on return.
280 data_phase See below 786 data_phase See below
281 req_cmd Command type, 787 req_cmd Command type, see below
282 out_size output (user-> 788 out_size output (user->drive) buffer size, bytes
283 in_size input (drive-> 789 in_size input (drive->user) buffer size, bytes
284 ============ ============== 790 ============ ===============================================
285 791
286 When out_flags is zero, the followin 792 When out_flags is zero, the following registers are loaded.
287 793
288 ============ ============== 794 ============ ===============================================
289 HOB_FEATURE If the drive s 795 HOB_FEATURE If the drive supports LBA48
290 HOB_NSECTOR If the drive s 796 HOB_NSECTOR If the drive supports LBA48
291 HOB_SECTOR If the drive s 797 HOB_SECTOR If the drive supports LBA48
292 HOB_LCYL If the drive s 798 HOB_LCYL If the drive supports LBA48
293 HOB_HCYL If the drive s 799 HOB_HCYL If the drive supports LBA48
294 FEATURE 800 FEATURE
295 NSECTOR 801 NSECTOR
296 SECTOR 802 SECTOR
297 LCYL 803 LCYL
298 HCYL 804 HCYL
299 SELECT First, masked 805 SELECT First, masked with 0xE0 if LBA48, 0xEF
300 otherwise; the 806 otherwise; then, or'ed with the default
301 value of SELEC 807 value of SELECT.
302 ============ ============== 808 ============ ===============================================
303 809
304 If any bit in out_flags is set, the 810 If any bit in out_flags is set, the following registers are loaded.
305 811
306 ============ ============== 812 ============ ===============================================
307 HOB_DATA If out_flags.b 813 HOB_DATA If out_flags.b.data is set. HOB_DATA will
308 travel on DD8- 814 travel on DD8-DD15 on little endian machines
309 and on DD0-DD7 815 and on DD0-DD7 on big endian machines.
310 DATA If out_flags.b 816 DATA If out_flags.b.data is set. DATA will
311 travel on DD0- 817 travel on DD0-DD7 on little endian machines
312 and on DD8-DD1 818 and on DD8-DD15 on big endian machines.
313 HOB_NSECTOR If out_flags.b 819 HOB_NSECTOR If out_flags.b.nsector_hob is set
314 HOB_SECTOR If out_flags.b 820 HOB_SECTOR If out_flags.b.sector_hob is set
315 HOB_LCYL If out_flags.b 821 HOB_LCYL If out_flags.b.lcyl_hob is set
316 HOB_HCYL If out_flags.b 822 HOB_HCYL If out_flags.b.hcyl_hob is set
317 FEATURE If out_flags.b 823 FEATURE If out_flags.b.feature is set
318 NSECTOR If out_flags.b 824 NSECTOR If out_flags.b.nsector is set
319 SECTOR If out_flags.b 825 SECTOR If out_flags.b.sector is set
320 LCYL If out_flags.b 826 LCYL If out_flags.b.lcyl is set
321 HCYL If out_flags.b 827 HCYL If out_flags.b.hcyl is set
322 SELECT Or'ed with the 828 SELECT Or'ed with the default value of SELECT and
323 loaded regardl 829 loaded regardless of out_flags.b.select.
324 ============ ============== 830 ============ ===============================================
325 831
326 Taskfile registers are read back fro 832 Taskfile registers are read back from the drive into
327 {io|hob}_ports[] after the command c 833 {io|hob}_ports[] after the command completes iff one of the
328 following conditions is met; otherwi 834 following conditions is met; otherwise, the original values
329 will be written back, unchanged. 835 will be written back, unchanged.
330 836
331 1. The drive fails the command (EI 837 1. The drive fails the command (EIO).
332 2. One or more than one bits are s 838 2. One or more than one bits are set in out_flags.
333 3. The requested data_phase is TAS 839 3. The requested data_phase is TASKFILE_NO_DATA.
334 840
335 ============ ============== 841 ============ ===============================================
336 HOB_DATA If in_flags.b. 842 HOB_DATA If in_flags.b.data is set. It will contain
337 DD8-DD15 on li 843 DD8-DD15 on little endian machines and
338 DD0-DD7 on big 844 DD0-DD7 on big endian machines.
339 DATA If in_flags.b. 845 DATA If in_flags.b.data is set. It will contain
340 DD0-DD7 on lit 846 DD0-DD7 on little endian machines and
341 DD8-DD15 on bi 847 DD8-DD15 on big endian machines.
342 HOB_FEATURE If the drive s 848 HOB_FEATURE If the drive supports LBA48
343 HOB_NSECTOR If the drive s 849 HOB_NSECTOR If the drive supports LBA48
344 HOB_SECTOR If the drive s 850 HOB_SECTOR If the drive supports LBA48
345 HOB_LCYL If the drive s 851 HOB_LCYL If the drive supports LBA48
346 HOB_HCYL If the drive s 852 HOB_HCYL If the drive supports LBA48
347 NSECTOR 853 NSECTOR
348 SECTOR 854 SECTOR
349 LCYL 855 LCYL
350 HCYL 856 HCYL
351 ============ ============== 857 ============ ===============================================
352 858
353 The data_phase field describes the d 859 The data_phase field describes the data transfer to be
354 performed. Value is one of: 860 performed. Value is one of:
355 861
356 =================== ======= 862 =================== ========================================
357 TASKFILE_IN 863 TASKFILE_IN
358 TASKFILE_MULTI_IN 864 TASKFILE_MULTI_IN
359 TASKFILE_OUT 865 TASKFILE_OUT
360 TASKFILE_MULTI_OUT 866 TASKFILE_MULTI_OUT
361 TASKFILE_IN_OUT 867 TASKFILE_IN_OUT
362 TASKFILE_IN_DMA 868 TASKFILE_IN_DMA
363 TASKFILE_IN_DMAQ == IN_ 869 TASKFILE_IN_DMAQ == IN_DMA (queueing not supported)
364 TASKFILE_OUT_DMA 870 TASKFILE_OUT_DMA
365 TASKFILE_OUT_DMAQ == OUT 871 TASKFILE_OUT_DMAQ == OUT_DMA (queueing not supported)
366 TASKFILE_P_IN unimpl 872 TASKFILE_P_IN unimplemented
367 TASKFILE_P_IN_DMA unimpl 873 TASKFILE_P_IN_DMA unimplemented
368 TASKFILE_P_IN_DMAQ unimpl 874 TASKFILE_P_IN_DMAQ unimplemented
369 TASKFILE_P_OUT unimpl 875 TASKFILE_P_OUT unimplemented
370 TASKFILE_P_OUT_DMA unimpl 876 TASKFILE_P_OUT_DMA unimplemented
371 TASKFILE_P_OUT_DMAQ unimpl 877 TASKFILE_P_OUT_DMAQ unimplemented
372 =================== ======= 878 =================== ========================================
373 879
374 The req_cmd field classifies the com 880 The req_cmd field classifies the command type. It may be
375 one of: 881 one of:
376 882
377 ======================== ====== 883 ======================== =======================================
378 IDE_DRIVE_TASK_NO_DATA 884 IDE_DRIVE_TASK_NO_DATA
379 IDE_DRIVE_TASK_SET_XFER unimpl 885 IDE_DRIVE_TASK_SET_XFER unimplemented
380 IDE_DRIVE_TASK_IN 886 IDE_DRIVE_TASK_IN
381 IDE_DRIVE_TASK_OUT unimpl 887 IDE_DRIVE_TASK_OUT unimplemented
382 IDE_DRIVE_TASK_RAW_WRITE 888 IDE_DRIVE_TASK_RAW_WRITE
383 ======================== ====== 889 ======================== =======================================
384 890
385 [6] Do not access {in|out}_flags->al 891 [6] Do not access {in|out}_flags->all except for resetting
386 all the bits. Always access individ 892 all the bits. Always access individual bit fields. ->all
387 value will flip depending on endiann 893 value will flip depending on endianness. For the same
388 reason, do not use IDE_{TASKFILE|HOB 894 reason, do not use IDE_{TASKFILE|HOB}_STD_{OUT|IN}_FLAGS
389 constants defined in hdreg.h. 895 constants defined in hdreg.h.
390 896
391 897
392 898
393 HDIO_DRIVE_CMD 899 HDIO_DRIVE_CMD
394 execute a special drive command 900 execute a special drive command
395 901
396 902
397 Note: If you don't have a copy of the 903 Note: If you don't have a copy of the ANSI ATA specification
398 handy, you should probably ignore this 904 handy, you should probably ignore this ioctl.
399 905
400 usage:: 906 usage::
401 907
402 u8 args[4+XFER_SIZE]; 908 u8 args[4+XFER_SIZE];
403 909
404 ... 910 ...
405 ioctl(fd, HDIO_DRIVE_CMD, args); 911 ioctl(fd, HDIO_DRIVE_CMD, args);
406 912
407 inputs: 913 inputs:
408 Commands other than WIN_SMART: 914 Commands other than WIN_SMART:
409 915
410 ======= ======= 916 ======= =======
411 args[0] COMMAND 917 args[0] COMMAND
412 args[1] NSECTOR 918 args[1] NSECTOR
413 args[2] FEATURE 919 args[2] FEATURE
414 args[3] NSECTOR 920 args[3] NSECTOR
415 ======= ======= 921 ======= =======
416 922
417 WIN_SMART: 923 WIN_SMART:
418 924
419 ======= ======= 925 ======= =======
420 args[0] COMMAND 926 args[0] COMMAND
421 args[1] SECTOR 927 args[1] SECTOR
422 args[2] FEATURE 928 args[2] FEATURE
423 args[3] NSECTOR 929 args[3] NSECTOR
424 ======= ======= 930 ======= =======
425 931
426 outputs: 932 outputs:
427 args[] buffer is filled with r 933 args[] buffer is filled with register values followed by any
428 934
429 935
430 data returned by the disk. 936 data returned by the disk.
431 937
432 ======== ====================== 938 ======== ====================================================
433 args[0] status 939 args[0] status
434 args[1] error 940 args[1] error
435 args[2] NSECTOR 941 args[2] NSECTOR
436 args[3] undefined 942 args[3] undefined
437 args[4+] NSECTOR * 512 bytes of 943 args[4+] NSECTOR * 512 bytes of data returned by the command.
438 ======== ====================== 944 ======== ====================================================
439 945
440 error returns: 946 error returns:
441 - EACCES Access denied: requir 947 - EACCES Access denied: requires CAP_SYS_RAWIO
442 - ENOMEM Unable to allocate mem 948 - ENOMEM Unable to allocate memory for task
443 - EIO Drive reports error 949 - EIO Drive reports error
444 950
445 notes: 951 notes:
446 952
447 [1] For commands other than WIN_SMAR 953 [1] For commands other than WIN_SMART, args[1] should equal
448 args[3]. SECTOR, LCYL and HCYL are 954 args[3]. SECTOR, LCYL and HCYL are undefined. For
449 WIN_SMART, 0x4f and 0xc2 are loaded 955 WIN_SMART, 0x4f and 0xc2 are loaded into LCYL and HCYL
450 respectively. In both cases SELECT 956 respectively. In both cases SELECT will contain the default
451 value for the drive. Please refer t 957 value for the drive. Please refer to HDIO_DRIVE_TASKFILE
452 notes for the default value of SELEC 958 notes for the default value of SELECT.
453 959
454 [2] If NSECTOR value is greater than 960 [2] If NSECTOR value is greater than zero and the drive sets
455 DRQ when interrupting for the comman 961 DRQ when interrupting for the command, NSECTOR * 512 bytes
456 are read from the device into the ar 962 are read from the device into the area following NSECTOR.
457 In the above example, the area would 963 In the above example, the area would be
458 args[4..4+XFER_SIZE]. 16bit PIO is 964 args[4..4+XFER_SIZE]. 16bit PIO is used regardless of
459 HDIO_SET_32BIT setting. 965 HDIO_SET_32BIT setting.
460 966
461 [3] If COMMAND == WIN_SETFEATURES && 967 [3] If COMMAND == WIN_SETFEATURES && FEATURE == SETFEATURES_XFER
462 && NSECTOR >= XFER_SW_DMA_0 && the d 968 && NSECTOR >= XFER_SW_DMA_0 && the drive supports any DMA
463 mode, IDE driver will try to tune th 969 mode, IDE driver will try to tune the transfer mode of the
464 drive accordingly. 970 drive accordingly.
465 971
466 972
467 973
468 HDIO_DRIVE_TASK 974 HDIO_DRIVE_TASK
469 execute task and special drive command 975 execute task and special drive command
470 976
471 977
472 Note: If you don't have a copy of the 978 Note: If you don't have a copy of the ANSI ATA specification
473 handy, you should probably ignore this 979 handy, you should probably ignore this ioctl.
474 980
475 usage:: 981 usage::
476 982
477 u8 args[7]; 983 u8 args[7];
478 984
479 ... 985 ...
480 ioctl(fd, HDIO_DRIVE_TASK, args); 986 ioctl(fd, HDIO_DRIVE_TASK, args);
481 987
482 inputs: 988 inputs:
483 Taskfile register values: 989 Taskfile register values:
484 990
485 ======= ======= 991 ======= =======
486 args[0] COMMAND 992 args[0] COMMAND
487 args[1] FEATURE 993 args[1] FEATURE
488 args[2] NSECTOR 994 args[2] NSECTOR
489 args[3] SECTOR 995 args[3] SECTOR
490 args[4] LCYL 996 args[4] LCYL
491 args[5] HCYL 997 args[5] HCYL
492 args[6] SELECT 998 args[6] SELECT
493 ======= ======= 999 ======= =======
494 1000
495 outputs: 1001 outputs:
496 Taskfile register values: 1002 Taskfile register values:
497 1003
498 1004
499 ======= ======= 1005 ======= =======
500 args[0] status 1006 args[0] status
501 args[1] error 1007 args[1] error
502 args[2] NSECTOR 1008 args[2] NSECTOR
503 args[3] SECTOR 1009 args[3] SECTOR
504 args[4] LCYL 1010 args[4] LCYL
505 args[5] HCYL 1011 args[5] HCYL
506 args[6] SELECT 1012 args[6] SELECT
507 ======= ======= 1013 ======= =======
508 1014
509 error returns: 1015 error returns:
510 - EACCES Access denied: requir 1016 - EACCES Access denied: requires CAP_SYS_RAWIO
511 - ENOMEM Unable to allocate mem 1017 - ENOMEM Unable to allocate memory for task
512 - ENOMSG Device is not a disk d 1018 - ENOMSG Device is not a disk drive.
513 - EIO Drive failed the comma 1019 - EIO Drive failed the command.
514 1020
515 notes: 1021 notes:
516 1022
517 [1] DEV bit (0x10) of SELECT registe 1023 [1] DEV bit (0x10) of SELECT register is ignored and the
518 appropriate value for the drive is u 1024 appropriate value for the drive is used. All other bits
519 are used unaltered. 1025 are used unaltered.
520 1026
521 1027
522 1028
>> 1029 HDIO_DRIVE_CMD_AEB
>> 1030 HDIO_DRIVE_TASK
>> 1031
>> 1032
>> 1033 Not implemented, as of 2.6.8.1
>> 1034
>> 1035
>> 1036
523 HDIO_SET_32BIT 1037 HDIO_SET_32BIT
524 change io_32bit flags 1038 change io_32bit flags
525 1039
526 1040
527 usage:: 1041 usage::
528 1042
529 int val; 1043 int val;
530 1044
531 ioctl(fd, HDIO_SET_32BIT, val); 1045 ioctl(fd, HDIO_SET_32BIT, val);
532 1046
533 inputs: 1047 inputs:
534 New value for io_32bit flag 1048 New value for io_32bit flag
535 1049
536 1050
537 1051
538 outputs: 1052 outputs:
539 none 1053 none
540 1054
541 1055
542 1056
543 error return: 1057 error return:
544 - EINVAL Called on a partition !! 1058 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
545 - EACCES Access denied: requir 1059 - EACCES Access denied: requires CAP_SYS_ADMIN
546 - EINVAL value out of range [0 1060 - EINVAL value out of range [0 3]
547 - EBUSY Controller busy 1061 - EBUSY Controller busy
>> 1062
>> 1063
>> 1064
>> 1065
>> 1066 HDIO_SET_NOWERR
>> 1067 change ignore-write-error flag
>> 1068
>> 1069
>> 1070 usage::
>> 1071
>> 1072 int val;
>> 1073
>> 1074 ioctl(fd, HDIO_SET_NOWERR, val);
>> 1075
>> 1076 inputs:
>> 1077 New value for ignore-write-error flag. Used for ignoring
>> 1078
>> 1079
>> 1080 WRERR_STAT
>> 1081
>> 1082 outputs:
>> 1083 none
>> 1084
>> 1085
>> 1086
>> 1087 error return:
>> 1088 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1089 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1090 - EINVAL value out of range [0 1]
>> 1091 - EBUSY Controller busy
>> 1092
>> 1093
>> 1094
>> 1095 HDIO_SET_DMA
>> 1096 change use-dma flag
>> 1097
>> 1098
>> 1099 usage::
>> 1100
>> 1101 long val;
>> 1102
>> 1103 ioctl(fd, HDIO_SET_DMA, val);
>> 1104
>> 1105 inputs:
>> 1106 New value for use-dma flag
>> 1107
>> 1108
>> 1109
>> 1110 outputs:
>> 1111 none
>> 1112
>> 1113
>> 1114
>> 1115 error return:
>> 1116 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1117 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1118 - EINVAL value out of range [0 1]
>> 1119 - EBUSY Controller busy
>> 1120
>> 1121
>> 1122
>> 1123 HDIO_SET_PIO_MODE
>> 1124 reconfig interface to new speed
>> 1125
>> 1126
>> 1127 usage::
>> 1128
>> 1129 long val;
>> 1130
>> 1131 ioctl(fd, HDIO_SET_PIO_MODE, val);
>> 1132
>> 1133 inputs:
>> 1134 New interface speed.
>> 1135
>> 1136
>> 1137
>> 1138 outputs:
>> 1139 none
>> 1140
>> 1141
>> 1142
>> 1143 error return:
>> 1144 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1145 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1146 - EINVAL value out of range [0 255]
>> 1147 - EBUSY Controller busy
>> 1148
>> 1149
>> 1150
>> 1151 HDIO_SCAN_HWIF
>> 1152 register and (re)scan interface
>> 1153
>> 1154
>> 1155 usage::
>> 1156
>> 1157 int args[3]
>> 1158
>> 1159 ...
>> 1160 ioctl(fd, HDIO_SCAN_HWIF, args);
>> 1161
>> 1162 inputs:
>> 1163
>> 1164 ======= =========================
>> 1165 args[0] io address to probe
>> 1166
>> 1167
>> 1168 args[1] control address to probe
>> 1169 args[2] irq number
>> 1170 ======= =========================
>> 1171
>> 1172 outputs:
>> 1173 none
>> 1174
>> 1175
>> 1176
>> 1177 error returns:
>> 1178 - EACCES Access denied: requires CAP_SYS_RAWIO
>> 1179 - EIO Probe failed.
>> 1180
>> 1181 notes:
>> 1182 This ioctl initializes the addresses and irq for a disk
>> 1183 controller, probes for drives, and creates /proc/ide
>> 1184 interfaces as appropriate.
>> 1185
>> 1186
>> 1187
>> 1188 HDIO_UNREGISTER_HWIF
>> 1189 unregister interface
>> 1190
>> 1191
>> 1192 usage::
>> 1193
>> 1194 int index;
>> 1195
>> 1196 ioctl(fd, HDIO_UNREGISTER_HWIF, index);
>> 1197
>> 1198 inputs:
>> 1199 index index of hardware interface to unregister
>> 1200
>> 1201
>> 1202
>> 1203 outputs:
>> 1204 none
>> 1205
>> 1206
>> 1207
>> 1208 error returns:
>> 1209 - EACCES Access denied: requires CAP_SYS_RAWIO
>> 1210
>> 1211 notes:
>> 1212 This ioctl removes a hardware interface from the kernel.
>> 1213
>> 1214 Currently (2.6.8) this ioctl silently fails if any drive on
>> 1215 the interface is busy.
>> 1216
>> 1217
>> 1218
>> 1219 HDIO_SET_WCACHE
>> 1220 change write cache enable-disable
>> 1221
>> 1222
>> 1223 usage::
>> 1224
>> 1225 int val;
>> 1226
>> 1227 ioctl(fd, HDIO_SET_WCACHE, val);
>> 1228
>> 1229 inputs:
>> 1230 New value for write cache enable
>> 1231
>> 1232
>> 1233
>> 1234 outputs:
>> 1235 none
>> 1236
>> 1237
>> 1238
>> 1239 error return:
>> 1240 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1241 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1242 - EINVAL value out of range [0 1]
>> 1243 - EBUSY Controller busy
>> 1244
>> 1245
>> 1246
>> 1247 HDIO_SET_ACOUSTIC
>> 1248 change acoustic behavior
>> 1249
>> 1250
>> 1251 usage::
>> 1252
>> 1253 int val;
>> 1254
>> 1255 ioctl(fd, HDIO_SET_ACOUSTIC, val);
>> 1256
>> 1257 inputs:
>> 1258 New value for drive acoustic settings
>> 1259
>> 1260
>> 1261
>> 1262 outputs:
>> 1263 none
>> 1264
>> 1265
>> 1266
>> 1267 error return:
>> 1268 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1269 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1270 - EINVAL value out of range [0 254]
>> 1271 - EBUSY Controller busy
>> 1272
>> 1273
>> 1274
>> 1275 HDIO_SET_QDMA
>> 1276 change use-qdma flag
>> 1277
>> 1278
>> 1279 Not implemented, as of 2.6.8.1
>> 1280
>> 1281
>> 1282
>> 1283 HDIO_SET_ADDRESS
>> 1284 change lba addressing modes
>> 1285
>> 1286
>> 1287 usage::
>> 1288
>> 1289 int val;
>> 1290
>> 1291 ioctl(fd, HDIO_SET_ADDRESS, val);
>> 1292
>> 1293 inputs:
>> 1294 New value for addressing mode
>> 1295
>> 1296 = ===================
>> 1297 0 28-bit
>> 1298 1 48-bit
>> 1299 2 48-bit doing 28-bit
>> 1300 = ===================
>> 1301
>> 1302 outputs:
>> 1303 none
>> 1304
>> 1305
>> 1306
>> 1307 error return:
>> 1308 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1309 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1310 - EINVAL value out of range [0 2]
>> 1311 - EBUSY Controller busy
>> 1312 - EIO Drive does not support lba48 mode.
>> 1313
>> 1314
>> 1315 HDIO_SET_IDE_SCSI
>> 1316 usage::
>> 1317
>> 1318
>> 1319 long val;
>> 1320
>> 1321 ioctl(fd, HDIO_SET_IDE_SCSI, val);
>> 1322
>> 1323 inputs:
>> 1324 New value for scsi emulation mode (?)
>> 1325
>> 1326
>> 1327
>> 1328 outputs:
>> 1329 none
>> 1330
>> 1331
>> 1332
>> 1333 error return:
>> 1334 - EINVAL (bdev != bdev->bd_contains) (not sure what this means)
>> 1335 - EACCES Access denied: requires CAP_SYS_ADMIN
>> 1336 - EINVAL value out of range [0 1]
>> 1337 - EBUSY Controller busy
>> 1338
>> 1339
>> 1340
>> 1341 HDIO_SET_SCSI_IDE
>> 1342 Not implemented, as of 2.6.8.1
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