sysfs: Cache the last sysfs_dirent to improve readdir scalability v2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / scsi / scsi.h
blob8b4deca996ad93444f9eb2583928af28cf078ff5
1 /*
2 * This header file contains public constants and structures used by
3 * the scsi code for linux.
5 * For documentation on the OPCODES, MESSAGES, and SENSE values,
6 * please consult the SCSI standard.
7 */
8 #ifndef _SCSI_SCSI_H
9 #define _SCSI_SCSI_H
11 #include <linux/types.h>
13 struct scsi_cmnd;
16 * The maximum number of SG segments that we will put inside a
17 * scatterlist (unless chaining is used). Should ideally fit inside a
18 * single page, to avoid a higher order allocation. We could define this
19 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
20 * minimum value is 32
22 #define SCSI_MAX_SG_SEGMENTS 128
25 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
26 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
28 #ifdef ARCH_HAS_SG_CHAIN
29 #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
30 #else
31 #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
32 #endif
35 * Special value for scanning to specify scanning or rescanning of all
36 * possible channels, (target) ids, or luns on a given shost.
38 #define SCAN_WILD_CARD ~0
41 * SCSI opcodes
44 #define TEST_UNIT_READY 0x00
45 #define REZERO_UNIT 0x01
46 #define REQUEST_SENSE 0x03
47 #define FORMAT_UNIT 0x04
48 #define READ_BLOCK_LIMITS 0x05
49 #define REASSIGN_BLOCKS 0x07
50 #define INITIALIZE_ELEMENT_STATUS 0x07
51 #define READ_6 0x08
52 #define WRITE_6 0x0a
53 #define SEEK_6 0x0b
54 #define READ_REVERSE 0x0f
55 #define WRITE_FILEMARKS 0x10
56 #define SPACE 0x11
57 #define INQUIRY 0x12
58 #define RECOVER_BUFFERED_DATA 0x14
59 #define MODE_SELECT 0x15
60 #define RESERVE 0x16
61 #define RELEASE 0x17
62 #define COPY 0x18
63 #define ERASE 0x19
64 #define MODE_SENSE 0x1a
65 #define START_STOP 0x1b
66 #define RECEIVE_DIAGNOSTIC 0x1c
67 #define SEND_DIAGNOSTIC 0x1d
68 #define ALLOW_MEDIUM_REMOVAL 0x1e
70 #define SET_WINDOW 0x24
71 #define READ_CAPACITY 0x25
72 #define READ_10 0x28
73 #define WRITE_10 0x2a
74 #define SEEK_10 0x2b
75 #define POSITION_TO_ELEMENT 0x2b
76 #define WRITE_VERIFY 0x2e
77 #define VERIFY 0x2f
78 #define SEARCH_HIGH 0x30
79 #define SEARCH_EQUAL 0x31
80 #define SEARCH_LOW 0x32
81 #define SET_LIMITS 0x33
82 #define PRE_FETCH 0x34
83 #define READ_POSITION 0x34
84 #define SYNCHRONIZE_CACHE 0x35
85 #define LOCK_UNLOCK_CACHE 0x36
86 #define READ_DEFECT_DATA 0x37
87 #define MEDIUM_SCAN 0x38
88 #define COMPARE 0x39
89 #define COPY_VERIFY 0x3a
90 #define WRITE_BUFFER 0x3b
91 #define READ_BUFFER 0x3c
92 #define UPDATE_BLOCK 0x3d
93 #define READ_LONG 0x3e
94 #define WRITE_LONG 0x3f
95 #define CHANGE_DEFINITION 0x40
96 #define WRITE_SAME 0x41
97 #define UNMAP 0x42
98 #define READ_TOC 0x43
99 #define LOG_SELECT 0x4c
100 #define LOG_SENSE 0x4d
101 #define XDWRITEREAD_10 0x53
102 #define MODE_SELECT_10 0x55
103 #define RESERVE_10 0x56
104 #define RELEASE_10 0x57
105 #define MODE_SENSE_10 0x5a
106 #define PERSISTENT_RESERVE_IN 0x5e
107 #define PERSISTENT_RESERVE_OUT 0x5f
108 #define VARIABLE_LENGTH_CMD 0x7f
109 #define REPORT_LUNS 0xa0
110 #define MAINTENANCE_IN 0xa3
111 #define MAINTENANCE_OUT 0xa4
112 #define MOVE_MEDIUM 0xa5
113 #define EXCHANGE_MEDIUM 0xa6
114 #define READ_12 0xa8
115 #define WRITE_12 0xaa
116 #define WRITE_VERIFY_12 0xae
117 #define SEARCH_HIGH_12 0xb0
118 #define SEARCH_EQUAL_12 0xb1
119 #define SEARCH_LOW_12 0xb2
120 #define READ_ELEMENT_STATUS 0xb8
121 #define SEND_VOLUME_TAG 0xb6
122 #define WRITE_LONG_2 0xea
123 #define READ_16 0x88
124 #define WRITE_16 0x8a
125 #define VERIFY_16 0x8f
126 #define WRITE_SAME_16 0x93
127 #define SERVICE_ACTION_IN 0x9e
128 /* values for service action in */
129 #define SAI_READ_CAPACITY_16 0x10
130 #define SAI_GET_LBA_STATUS 0x12
131 /* values for maintenance in */
132 #define MI_REPORT_TARGET_PGS 0x0a
133 /* values for maintenance out */
134 #define MO_SET_TARGET_PGS 0x0a
135 /* values for variable length command */
136 #define READ_32 0x09
137 #define WRITE_32 0x0b
138 #define WRITE_SAME_32 0x0d
140 /* Values for T10/04-262r7 */
141 #define ATA_16 0x85 /* 16-byte pass-thru */
142 #define ATA_12 0xa1 /* 12-byte pass-thru */
145 * SCSI command lengths
148 #define SCSI_MAX_VARLEN_CDB_SIZE 260
150 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
151 struct scsi_varlen_cdb_hdr {
152 u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
153 u8 control;
154 u8 misc[5];
155 u8 additional_cdb_length; /* total cdb length - 8 */
156 __be16 service_action;
157 /* service specific data follows */
160 static inline unsigned
161 scsi_varlen_cdb_length(const void *hdr)
163 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
166 extern const unsigned char scsi_command_size_tbl[8];
167 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
169 static inline unsigned
170 scsi_command_size(const unsigned char *cmnd)
172 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
173 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
177 * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
178 * T10/1561-D Revision 4 Draft dated 7th November 2002.
180 #define SAM_STAT_GOOD 0x00
181 #define SAM_STAT_CHECK_CONDITION 0x02
182 #define SAM_STAT_CONDITION_MET 0x04
183 #define SAM_STAT_BUSY 0x08
184 #define SAM_STAT_INTERMEDIATE 0x10
185 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
186 #define SAM_STAT_RESERVATION_CONFLICT 0x18
187 #define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
188 #define SAM_STAT_TASK_SET_FULL 0x28
189 #define SAM_STAT_ACA_ACTIVE 0x30
190 #define SAM_STAT_TASK_ABORTED 0x40
192 /** scsi_status_is_good - check the status return.
194 * @status: the status passed up from the driver (including host and
195 * driver components)
197 * This returns true for known good conditions that may be treated as
198 * command completed normally
200 static inline int scsi_status_is_good(int status)
203 * FIXME: bit0 is listed as reserved in SCSI-2, but is
204 * significant in SCSI-3. For now, we follow the SCSI-2
205 * behaviour and ignore reserved bits.
207 status &= 0xfe;
208 return ((status == SAM_STAT_GOOD) ||
209 (status == SAM_STAT_INTERMEDIATE) ||
210 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
211 /* FIXME: this is obsolete in SAM-3 */
212 (status == SAM_STAT_COMMAND_TERMINATED));
216 * Status codes. These are deprecated as they are shifted 1 bit right
217 * from those found in the SCSI standards. This causes confusion for
218 * applications that are ported to several OSes. Prefer SAM Status codes
219 * above.
222 #define GOOD 0x00
223 #define CHECK_CONDITION 0x01
224 #define CONDITION_GOOD 0x02
225 #define BUSY 0x04
226 #define INTERMEDIATE_GOOD 0x08
227 #define INTERMEDIATE_C_GOOD 0x0a
228 #define RESERVATION_CONFLICT 0x0c
229 #define COMMAND_TERMINATED 0x11
230 #define QUEUE_FULL 0x14
231 #define ACA_ACTIVE 0x18
232 #define TASK_ABORTED 0x20
234 #define STATUS_MASK 0xfe
237 * SENSE KEYS
240 #define NO_SENSE 0x00
241 #define RECOVERED_ERROR 0x01
242 #define NOT_READY 0x02
243 #define MEDIUM_ERROR 0x03
244 #define HARDWARE_ERROR 0x04
245 #define ILLEGAL_REQUEST 0x05
246 #define UNIT_ATTENTION 0x06
247 #define DATA_PROTECT 0x07
248 #define BLANK_CHECK 0x08
249 #define COPY_ABORTED 0x0a
250 #define ABORTED_COMMAND 0x0b
251 #define VOLUME_OVERFLOW 0x0d
252 #define MISCOMPARE 0x0e
256 * DEVICE TYPES
257 * Please keep them in 0x%02x format for $MODALIAS to work
260 #define TYPE_DISK 0x00
261 #define TYPE_TAPE 0x01
262 #define TYPE_PRINTER 0x02
263 #define TYPE_PROCESSOR 0x03 /* HP scanners use this */
264 #define TYPE_WORM 0x04 /* Treated as ROM by our system */
265 #define TYPE_ROM 0x05
266 #define TYPE_SCANNER 0x06
267 #define TYPE_MOD 0x07 /* Magneto-optical disk -
268 * - treated as TYPE_DISK */
269 #define TYPE_MEDIUM_CHANGER 0x08
270 #define TYPE_COMM 0x09 /* Communications device */
271 #define TYPE_RAID 0x0c
272 #define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
273 #define TYPE_RBC 0x0e
274 #define TYPE_OSD 0x11
275 #define TYPE_NO_LUN 0x7f
277 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
278 enum scsi_protocol {
279 SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
280 SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
281 SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
282 SCSI_PROTOCOL_SBP = 3, /* firewire */
283 SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
284 SCSI_PROTOCOL_ISCSI = 5,
285 SCSI_PROTOCOL_SAS = 6,
286 SCSI_PROTOCOL_ADT = 7, /* Media Changers */
287 SCSI_PROTOCOL_ATA = 8,
288 SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
291 /* Returns a human-readable name for the device */
292 extern const char * scsi_device_type(unsigned type);
295 * standard mode-select header prepended to all mode-select commands
298 struct ccs_modesel_head {
299 __u8 _r1; /* reserved */
300 __u8 medium; /* device-specific medium type */
301 __u8 _r2; /* reserved */
302 __u8 block_desc_length; /* block descriptor length */
303 __u8 density; /* device-specific density code */
304 __u8 number_blocks_hi; /* number of blocks in this block desc */
305 __u8 number_blocks_med;
306 __u8 number_blocks_lo;
307 __u8 _r3;
308 __u8 block_length_hi; /* block length for blocks in this desc */
309 __u8 block_length_med;
310 __u8 block_length_lo;
314 * ScsiLun: 8 byte LUN.
316 struct scsi_lun {
317 __u8 scsi_lun[8];
321 * The Well Known LUNS (SAM-3) in our int representation of a LUN
323 #define SCSI_W_LUN_BASE 0xc100
324 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
325 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
326 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
328 static inline int scsi_is_wlun(unsigned int lun)
330 return (lun & 0xff00) == SCSI_W_LUN_BASE;
335 * MESSAGE CODES
338 #define COMMAND_COMPLETE 0x00
339 #define EXTENDED_MESSAGE 0x01
340 #define EXTENDED_MODIFY_DATA_POINTER 0x00
341 #define EXTENDED_SDTR 0x01
342 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
343 #define EXTENDED_WDTR 0x03
344 #define EXTENDED_PPR 0x04
345 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
346 #define SAVE_POINTERS 0x02
347 #define RESTORE_POINTERS 0x03
348 #define DISCONNECT 0x04
349 #define INITIATOR_ERROR 0x05
350 #define ABORT_TASK_SET 0x06
351 #define MESSAGE_REJECT 0x07
352 #define NOP 0x08
353 #define MSG_PARITY_ERROR 0x09
354 #define LINKED_CMD_COMPLETE 0x0a
355 #define LINKED_FLG_CMD_COMPLETE 0x0b
356 #define TARGET_RESET 0x0c
357 #define ABORT_TASK 0x0d
358 #define CLEAR_TASK_SET 0x0e
359 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
360 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
361 #define CLEAR_ACA 0x16
362 #define LOGICAL_UNIT_RESET 0x17
363 #define SIMPLE_QUEUE_TAG 0x20
364 #define HEAD_OF_QUEUE_TAG 0x21
365 #define ORDERED_QUEUE_TAG 0x22
366 #define IGNORE_WIDE_RESIDUE 0x23
367 #define ACA 0x24
368 #define QAS_REQUEST 0x55
370 /* Old SCSI2 names, don't use in new code */
371 #define BUS_DEVICE_RESET TARGET_RESET
372 #define ABORT ABORT_TASK_SET
375 * Host byte codes
378 #define DID_OK 0x00 /* NO error */
379 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
380 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
381 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
382 #define DID_BAD_TARGET 0x04 /* BAD target. */
383 #define DID_ABORT 0x05 /* Told to abort for some other reason */
384 #define DID_PARITY 0x06 /* Parity error */
385 #define DID_ERROR 0x07 /* Internal error */
386 #define DID_RESET 0x08 /* Reset by somebody. */
387 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
388 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
389 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
390 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
391 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
392 * without decrementing the retry count */
393 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
394 * and the driver blocked the port to
395 * recover the link. Transport class will
396 * retry or fail IO */
397 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
398 #define DRIVER_OK 0x00 /* Driver status */
401 * These indicate the error that occurred, and what is available.
404 #define DRIVER_BUSY 0x01
405 #define DRIVER_SOFT 0x02
406 #define DRIVER_MEDIA 0x03
407 #define DRIVER_ERROR 0x04
409 #define DRIVER_INVALID 0x05
410 #define DRIVER_TIMEOUT 0x06
411 #define DRIVER_HARD 0x07
412 #define DRIVER_SENSE 0x08
415 * Internal return values.
418 #define NEEDS_RETRY 0x2001
419 #define SUCCESS 0x2002
420 #define FAILED 0x2003
421 #define QUEUED 0x2004
422 #define SOFT_ERROR 0x2005
423 #define ADD_TO_MLQUEUE 0x2006
424 #define TIMEOUT_ERROR 0x2007
425 #define SCSI_RETURN_NOT_HANDLED 0x2008
428 * Midlevel queue return values.
430 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
431 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
432 #define SCSI_MLQUEUE_EH_RETRY 0x1057
433 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
436 * Use these to separate status msg and our bytes
438 * These are set by:
440 * status byte = set from target device
441 * msg_byte = return status from host adapter itself.
442 * host_byte = set by low-level driver to indicate status.
443 * driver_byte = set by mid-level.
445 #define status_byte(result) (((result) >> 1) & 0x7f)
446 #define msg_byte(result) (((result) >> 8) & 0xff)
447 #define host_byte(result) (((result) >> 16) & 0xff)
448 #define driver_byte(result) (((result) >> 24) & 0xff)
450 #define sense_class(sense) (((sense) >> 4) & 0x7)
451 #define sense_error(sense) ((sense) & 0xf)
452 #define sense_valid(sense) ((sense) & 0x80);
455 * default timeouts
457 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
458 #define START_STOP_TIMEOUT (60 * HZ)
459 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
460 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
461 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
464 #define IDENTIFY_BASE 0x80
465 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
466 ((can_disconnect) ? 0x40 : 0) |\
467 ((lun) & 0x07))
470 * struct scsi_device::scsi_level values. For SCSI devices other than those
471 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
472 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
473 * variable is visible to the user via sysfs.
476 #define SCSI_UNKNOWN 0
477 #define SCSI_1 1
478 #define SCSI_1_CCS 2
479 #define SCSI_2 3
480 #define SCSI_3 4 /* SPC */
481 #define SCSI_SPC_2 5
482 #define SCSI_SPC_3 6
485 * INQ PERIPHERAL QUALIFIERS
487 #define SCSI_INQ_PQ_CON 0x00
488 #define SCSI_INQ_PQ_NOT_CON 0x01
489 #define SCSI_INQ_PQ_NOT_CAP 0x03
493 * Here are some scsi specific ioctl commands which are sometimes useful.
495 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
498 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
499 #define SCSI_IOCTL_GET_IDLUN 0x5382
501 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
503 /* Used to obtain the host number of a device. */
504 #define SCSI_IOCTL_PROBE_HOST 0x5385
506 /* Used to obtain the bus number for a device */
507 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
509 /* Used to obtain the PCI location of a device */
510 #define SCSI_IOCTL_GET_PCI 0x5387
512 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
513 static inline __u32 scsi_to_u32(__u8 *ptr)
515 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
518 #endif /* _SCSI_SCSI_H */