2 .\" Copyright (c) 1998 Kenneth D. Merry.
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
13 .\" 3. The name of the author may not be used to endorse or promote products
14 .\" derived from this software without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 .\" This man page borrows heavily from the old scsi(3) man page, which had
31 .\" the following copyright:
33 .\" Copyright (c) 1994 HD Associates (hd@world.std.com)
34 .\" All rights reserved.
36 .\" Redistribution and use in source and binary forms, with or without
37 .\" modification, are permitted provided that the following conditions
39 .\" 1. Redistributions of source code must retain the above copyright
40 .\" notice, this list of conditions and the following disclaimer.
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48 .\" may be used to endorse or promote products derived from this software
49 .\" without specific prior written permission.
51 .\" THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES``AS IS'' AND
52 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 .\" ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
55 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 .Nm csio_build_visit ,
71 .Nm csio_decode_visit ,
73 .Nm buff_decode_visit ,
75 .Nm csio_encode_visit ,
77 .Nd CAM user library SCSI buffer parsing routines
85 .Fa "struct ccb_scsiio *csio"
86 .Fa "u_int8_t *data_ptr"
87 .Fa "u_int32_t dxfer_len"
91 .Fa "const char *cmd_spec"
96 .Fa "struct ccb_scsiio *csio"
97 .Fa "u_int8_t *data_ptr"
98 .Fa "u_int32_t dxfer_len"
100 .Fa "int retry_count"
102 .Fa "const char *cmd_spec"
103 .Fa "int (*arg_get)(void *hook, char *field_name)"
108 .Fa "struct ccb_scsiio *csio"
109 .Fa "const char *fmt"
113 .Fo csio_decode_visit
114 .Fa "struct ccb_scsiio *csio"
115 .Fa "const char *fmt"
116 .Fa "void (*arg_put)(void *hook"
127 .Fa "const char *fmt"
131 .Fo buff_decode_visit
134 .Fa "const char *fmt"
135 .Fa "void (*arg_put)(void *, int, void *, int, char *)"
140 .Fa "struct ccb_scsiio *csio"
141 .Fa "const char *fmt"
145 .Fo csio_encode_visit
146 .Fa "struct ccb_scsiio *csio"
147 .Fa "const char *fmt"
148 .Fa "int (*arg_get)(void *hook, char *field_name)"
152 .Fo buff_encode_visit
155 .Fa "const char *fmt"
156 .Fa "int (*arg_get)(void *hook, char *field_name)"
160 The CAM buffer/CDB encoding and decoding routines provide a relatively easy
161 migration path for userland
163 applications written with the similarly-named
165 functions from the old
170 These functions may be used in new applications, but users may find it
171 easier to use the various SCSI CCB building functions included with the
176 .Fn scsi_start_stop ,
178 .Fn scsi_read_write )
183 structure based on the information provided in
184 the variable argument list.
185 It gracefully handles a NULL
187 argument passed to it.
190 is the length of the data phase; the data transfer direction is
196 is the data buffer used during the
202 command in question, this should be set to NULL.
204 transfer for the command, this buffer must be at least
209 are the flags defined in
212 /* Common CCB header */
215 CAM_CDB_POINTER = 0x00000001,/* The CDB field is a pointer */
216 CAM_QUEUE_ENABLE = 0x00000002,/* SIM queue actions are enabled */
217 CAM_CDB_LINKED = 0x00000004,/* CCB contains a linked CDB */
218 CAM_SCATTER_VALID = 0x00000010,/* Scatter/gather list is valid */
219 CAM_DIS_AUTOSENSE = 0x00000020,/* Disable autosense feature */
220 CAM_DIR_RESV = 0x00000000,/* Data direction (00:reserved) */
221 CAM_DIR_IN = 0x00000040,/* Data direction (01:DATA IN) */
222 CAM_DIR_OUT = 0x00000080,/* Data direction (10:DATA OUT) */
223 CAM_DIR_NONE = 0x000000C0,/* Data direction (11:no data) */
224 CAM_DIR_MASK = 0x000000C0,/* Data direction Mask */
225 CAM_SOFT_RST_OP = 0x00000100,/* Use Soft reset alternative */
226 CAM_ENG_SYNC = 0x00000200,/* Flush resid bytes on complete */
227 CAM_DEV_QFRZDIS = 0x00000400,/* Disable DEV Q freezing */
228 CAM_DEV_QFREEZE = 0x00000800,/* Freeze DEV Q on execution */
229 CAM_HIGH_POWER = 0x00001000,/* Command takes a lot of power */
230 CAM_SENSE_PTR = 0x00002000,/* Sense data is a pointer */
231 CAM_SENSE_PHYS = 0x00004000,/* Sense pointer is physical addr*/
232 CAM_TAG_ACTION_VALID = 0x00008000,/* Use the tag action in this ccb*/
233 CAM_PASS_ERR_RECOVER = 0x00010000,/* Pass driver does err. recovery*/
234 CAM_DIS_DISCONNECT = 0x00020000,/* Disable disconnect */
235 CAM_SG_LIST_PHYS = 0x00040000,/* SG list has physical addrs. */
236 CAM_MSG_BUF_PHYS = 0x00080000,/* Message buffer ptr is physical*/
237 CAM_SNS_BUF_PHYS = 0x00100000,/* Autosense data ptr is physical*/
238 CAM_DATA_PHYS = 0x00200000,/* SG/Buffer data ptrs are phys. */
239 CAM_CDB_PHYS = 0x00400000,/* CDB pointer is physical */
240 CAM_ENG_SGLIST = 0x00800000,/* SG list is for the HBA engine */
242 /* Phase cognizant mode flags */
243 CAM_DIS_AUTOSRP = 0x01000000,/* Disable autosave/restore ptrs */
244 CAM_DIS_AUTODISC = 0x02000000,/* Disable auto disconnect */
245 CAM_TGT_CCB_AVAIL = 0x04000000,/* Target CCB available */
246 CAM_TGT_PHASE_MODE = 0x08000000,/* The SIM runs in phase mode */
247 CAM_MSGB_VALID = 0x20000000,/* Message buffer valid */
248 CAM_STATUS_VALID = 0x40000000,/* Status buffer valid */
249 CAM_DATAB_VALID = 0x80000000,/* Data buffer valid */
251 /* Host target Mode flags */
252 CAM_TERM_IO = 0x20000000,/* Terminate I/O Message sup. */
253 CAM_DISCONNECT = 0x40000000,/* Disconnects are mandatory */
254 CAM_SEND_STATUS = 0x80000000,/* Send status after data phase */
258 Multiple flags should be ORed together.
259 Any of the CCB flags may be used,
260 although it is worth noting several important ones here:
261 .Bl -tag -width CAM_PASS_ERR_RECOVER
263 This indicates that the operation in question is a read operation.
265 data is being read from the
267 device to the user-supplied buffer.
269 This indicates that the operation is a write operation.
271 written from the user-supplied buffer to the device.
273 This indicates that there is no data to be transferred for this command.
274 .It Dv CAM_DEV_QFRZDIS
275 This flag disables device queue freezing as an error recovery mechanism.
276 .It Dv CAM_PASS_ERR_RECOVER
279 driver to enable error recovery.
280 The default is to not perform error
281 recovery, which means that the retry count will not be honored without this
282 flag, among other things.
284 This indicates that the address contained in
286 is a physical address, not a virtual address.
291 tells the kernel how many times to retry the command in question.
293 retry count is ignored unless the
295 driver is told to enable error recovery via the
296 .Dv CAM_PASS_ERR_RECOVER
301 tells the kernel how long to wait for the given command to complete.
303 the timeout expires and the command has not completed, the CCB will be
304 returned from the kernel with an appropriate error status.
307 is a CDB format specifier used to build up the SCSI CDB.
308 This text string is made up of a list of field specifiers.
310 specifiers specify the value for each CDB field (including indicating
311 that the value be taken from the next argument in the
312 variable argument list), the width
313 of the field in bits or bytes, and an optional name.
315 ignored, and the pound sign ('#') introduces a comment that ends at the
316 end of the current line.
318 The optional name is the first part of a field specifier and
320 The text in curly braces in this example are
322 .Dl "{PS} v:b1 {Reserved} 0:b1 {Page Code} v:b6 # Mode select page"
324 This field specifier has two one bit fields and one six bit field.
325 The second one bit field is the constant value 0 and the first
326 one bit field and the six bit field are taken from the variable
328 Multi byte fields are swapped into the SCSI byte order in the
329 CDB and white space is ignored.
331 When the field is a hex value or the letter v, (e.g.,
335 then a single byte value
336 is copied to the next unused byte of the CDB.
339 is used the next integer argument is taken from the variable argument list
342 A constant hex value followed by a field width specifier or the letter
344 followed by a field width specifier (e.g.,
349 specifies a field of a given bit or byte width.
350 Either the constant value or (for the V specifier) the next integer value from
351 the variable argument list is copied to the next unused
352 bits or bytes of the CDB.
354 A decimal number or the letter
356 followed by a decimal number field width indicates a bit field of that width.
357 The bit fields are packed as tightly as possible beginning with the
358 high bit (so that it reads the same as the SCSI spec), and a new byte of
359 the CDB is started whenever a byte fills completely or when an
361 field is encountered.
363 A field width specifier consisting of the letter
366 1, 2, 3 or 4 indicates a 1, 2, 3 or 4 byte integral value that must
367 be swapped into SCSI byte order (MSB first).
371 field specifier the next integer argument is taken from the variable argument
372 list and that value is used swapped into SCSI byte order.
375 operates similarly to
377 except that the values to substitute for variable arguments in
379 are retrieved via the
381 function passed in to
387 function takes two arguments:
388 .Bl -tag -width field_name
392 function at each invocation.
395 function to keep some state in between calls without using global or static
398 is the field name supplied in
404 is used to decode information from the data in phase of the SCSI
407 The decoding is similar to
408 the command specifier processing of
410 except that the data is extracted from the data pointed to by
412 The stdarg list should be pointers to integers instead of integer
414 A seek field type and a suppression modifier are added.
417 suppression modifier (e.g.,
421 suppresses assignment from the field and can be used to skip
422 over bytes or bits in the data, without having to copy
423 them to a dummy variable in the arg list.
427 permits you to skip over data.
428 This seeks to an absolute position
430 or a relative position
432 in the data, based on whether or not the presence of the '+' sign.
433 The seek value can be specified as
435 and the next integer value from the argument list will be
436 used as the seek value.
438 .Fn csio_decode_visit
441 except that instead of placing the decoded contents of the buffer in
442 variadic arguments, the decoded buffer contents are returned to the user
445 function that is passed in.
448 function takes several arguments:
449 .Bl -tag -width letter
451 The "hook" is a mechanism to allow the
453 function to save state in between calls.
455 is the letter describing the format of the argument being passed into the
458 is a void pointer to the value being passed into the function.
460 is the size of the value being passed into the
463 The argument format determines the unit of measure.
465 This is a text description of the field, if one was provided in the
470 decodes an arbitrary data buffer using the method
474 .Fn buff_decode_visit
475 decodes an arbitrary data buffer using the method described above for
476 .Fn csio_decode_visit .
481 portion (not the CDB!) of a
483 structure, using the method described above for
486 .Fn csio_encode_visit
489 portion (not the CDB!) of a
491 structure, using the method described above for
492 .Fn csio_build_visit .
494 .Fn buff_encode_visit
495 encodes an arbitrary data pointer, using the method described
497 .Fn csio_build_visit .
500 .Fn csio_build_visit ,
502 .Fn csio_encode_visit ,
504 .Fn buff_encode_visit
505 return the number of fields processed.
508 .Fn csio_decode_visit ,
511 .Fn buff_decode_visit
512 return the number of assignments performed.
518 The CAM versions of these functions are based upon similar functions
519 implemented for the old
523 The encoding/decoding functions in the old
525 code were written by Peter Dufault.
527 Many systems have comparable interfaces to permit a user to construct a
528 SCSI command in user space.
532 data structure was almost identical to the SGI /dev/scsi data
534 If anyone knows the name of the authors it should
535 go here; Peter Dufault first read about it in a 1989 Sun Expert magazine.
537 The new CCB data structures are derived from the CAM-2 and CAM-3
541 implemented a clone of SGI's interface in
547 library and the related kernel ioctl.
548 If anyone needs that for compatibility contact dufault@hda.com.
550 Kenneth Merry implemented the CAM versions of these encoding and decoding
552 This current work is based upon earlier work by Peter Dufault.
554 There should probably be a function that encodes both the CDB and the data
558 I discovered this while implementing the arbitrary command execution
561 but I have not yet had time to implement such a function.
563 Some of the CCB flag descriptions really do not belong here.
565 belong in a generic CCB man page.
566 Since that man page has not yet been
567 written, the shorter descriptions here will have to suffice.