515 lines
16 KiB
C
515 lines
16 KiB
C
/*
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* This header file contains public constants and structures used by
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* the scsi code for linux.
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*
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* For documentation on the OPCODES, MESSAGES, and SENSE values,
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* please consult the SCSI standard.
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*/
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#ifndef _SCSI_SCSI_H
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#define _SCSI_SCSI_H
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#include <linux/types.h>
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struct scsi_cmnd;
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/*
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* The maximum number of SG segments that we will put inside a
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* scatterlist (unless chaining is used). Should ideally fit inside a
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* single page, to avoid a higher order allocation. We could define this
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* to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
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* minimum value is 32
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*/
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#define SCSI_MAX_SG_SEGMENTS 128
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/*
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* Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
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* is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
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*/
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#ifdef ARCH_HAS_SG_CHAIN
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#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
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#else
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#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
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#endif
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/*
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* Special value for scanning to specify scanning or rescanning of all
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* possible channels, (target) ids, or luns on a given shost.
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*/
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#define SCAN_WILD_CARD ~0
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/*
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* SCSI opcodes
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*/
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#define TEST_UNIT_READY 0x00
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#define REZERO_UNIT 0x01
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#define REQUEST_SENSE 0x03
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#define FORMAT_UNIT 0x04
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#define READ_BLOCK_LIMITS 0x05
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#define REASSIGN_BLOCKS 0x07
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#define INITIALIZE_ELEMENT_STATUS 0x07
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#define READ_6 0x08
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#define WRITE_6 0x0a
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#define SEEK_6 0x0b
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#define READ_REVERSE 0x0f
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#define WRITE_FILEMARKS 0x10
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#define SPACE 0x11
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#define INQUIRY 0x12
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#define RECOVER_BUFFERED_DATA 0x14
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#define MODE_SELECT 0x15
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#define RESERVE 0x16
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#define RELEASE 0x17
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#define COPY 0x18
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#define ERASE 0x19
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#define MODE_SENSE 0x1a
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#define START_STOP 0x1b
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#define RECEIVE_DIAGNOSTIC 0x1c
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#define SEND_DIAGNOSTIC 0x1d
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#define ALLOW_MEDIUM_REMOVAL 0x1e
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#define SET_WINDOW 0x24
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#define READ_CAPACITY 0x25
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#define READ_10 0x28
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#define WRITE_10 0x2a
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#define SEEK_10 0x2b
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#define POSITION_TO_ELEMENT 0x2b
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#define WRITE_VERIFY 0x2e
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#define VERIFY 0x2f
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#define SEARCH_HIGH 0x30
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#define SEARCH_EQUAL 0x31
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#define SEARCH_LOW 0x32
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#define SET_LIMITS 0x33
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#define PRE_FETCH 0x34
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#define READ_POSITION 0x34
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#define SYNCHRONIZE_CACHE 0x35
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#define LOCK_UNLOCK_CACHE 0x36
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#define READ_DEFECT_DATA 0x37
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#define MEDIUM_SCAN 0x38
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#define COMPARE 0x39
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#define COPY_VERIFY 0x3a
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#define WRITE_BUFFER 0x3b
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#define READ_BUFFER 0x3c
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#define UPDATE_BLOCK 0x3d
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#define READ_LONG 0x3e
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#define WRITE_LONG 0x3f
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#define CHANGE_DEFINITION 0x40
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#define WRITE_SAME 0x41
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#define READ_TOC 0x43
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#define LOG_SELECT 0x4c
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#define LOG_SENSE 0x4d
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#define XDWRITEREAD_10 0x53
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#define MODE_SELECT_10 0x55
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#define RESERVE_10 0x56
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#define RELEASE_10 0x57
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#define MODE_SENSE_10 0x5a
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#define PERSISTENT_RESERVE_IN 0x5e
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#define PERSISTENT_RESERVE_OUT 0x5f
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#define VARIABLE_LENGTH_CMD 0x7f
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#define REPORT_LUNS 0xa0
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#define MAINTENANCE_IN 0xa3
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#define MAINTENANCE_OUT 0xa4
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#define MOVE_MEDIUM 0xa5
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#define EXCHANGE_MEDIUM 0xa6
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#define READ_12 0xa8
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#define WRITE_12 0xaa
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#define WRITE_VERIFY_12 0xae
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#define SEARCH_HIGH_12 0xb0
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#define SEARCH_EQUAL_12 0xb1
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#define SEARCH_LOW_12 0xb2
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#define READ_ELEMENT_STATUS 0xb8
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#define SEND_VOLUME_TAG 0xb6
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#define WRITE_LONG_2 0xea
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#define READ_16 0x88
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#define WRITE_16 0x8a
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#define VERIFY_16 0x8f
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#define SERVICE_ACTION_IN 0x9e
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/* values for service action in */
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#define SAI_READ_CAPACITY_16 0x10
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/* values for maintenance in */
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#define MI_REPORT_TARGET_PGS 0x0a
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/* values for maintenance out */
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#define MO_SET_TARGET_PGS 0x0a
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/* values for variable length command */
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#define READ_32 0x09
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#define WRITE_32 0x0b
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/* Values for T10/04-262r7 */
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#define ATA_16 0x85 /* 16-byte pass-thru */
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#define ATA_12 0xa1 /* 12-byte pass-thru */
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/*
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* SCSI command lengths
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*/
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#define SCSI_MAX_VARLEN_CDB_SIZE 260
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/* defined in T10 SCSI Primary Commands-2 (SPC2) */
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struct scsi_varlen_cdb_hdr {
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u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
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u8 control;
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u8 misc[5];
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u8 additional_cdb_length; /* total cdb length - 8 */
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__be16 service_action;
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/* service specific data follows */
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};
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static inline unsigned
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scsi_varlen_cdb_length(const void *hdr)
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{
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return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
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}
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extern const unsigned char scsi_command_size_tbl[8];
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#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
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static inline unsigned
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scsi_command_size(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
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}
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/*
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* SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
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* T10/1561-D Revision 4 Draft dated 7th November 2002.
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*/
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#define SAM_STAT_GOOD 0x00
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#define SAM_STAT_CHECK_CONDITION 0x02
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#define SAM_STAT_CONDITION_MET 0x04
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#define SAM_STAT_BUSY 0x08
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#define SAM_STAT_INTERMEDIATE 0x10
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#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
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#define SAM_STAT_RESERVATION_CONFLICT 0x18
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#define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
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#define SAM_STAT_TASK_SET_FULL 0x28
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#define SAM_STAT_ACA_ACTIVE 0x30
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#define SAM_STAT_TASK_ABORTED 0x40
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/** scsi_status_is_good - check the status return.
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*
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* @status: the status passed up from the driver (including host and
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* driver components)
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*
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* This returns true for known good conditions that may be treated as
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* command completed normally
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*/
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static inline int scsi_status_is_good(int status)
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{
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/*
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* FIXME: bit0 is listed as reserved in SCSI-2, but is
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* significant in SCSI-3. For now, we follow the SCSI-2
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* behaviour and ignore reserved bits.
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*/
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status &= 0xfe;
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return ((status == SAM_STAT_GOOD) ||
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(status == SAM_STAT_INTERMEDIATE) ||
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(status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
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/* FIXME: this is obsolete in SAM-3 */
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(status == SAM_STAT_COMMAND_TERMINATED));
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}
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/*
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* Status codes. These are deprecated as they are shifted 1 bit right
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* from those found in the SCSI standards. This causes confusion for
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* applications that are ported to several OSes. Prefer SAM Status codes
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* above.
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*/
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#define GOOD 0x00
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#define CHECK_CONDITION 0x01
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#define CONDITION_GOOD 0x02
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#define BUSY 0x04
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#define INTERMEDIATE_GOOD 0x08
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#define INTERMEDIATE_C_GOOD 0x0a
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#define RESERVATION_CONFLICT 0x0c
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#define COMMAND_TERMINATED 0x11
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#define QUEUE_FULL 0x14
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#define ACA_ACTIVE 0x18
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#define TASK_ABORTED 0x20
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#define STATUS_MASK 0xfe
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/*
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* SENSE KEYS
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*/
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#define NO_SENSE 0x00
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#define RECOVERED_ERROR 0x01
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#define NOT_READY 0x02
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#define MEDIUM_ERROR 0x03
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#define HARDWARE_ERROR 0x04
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#define ILLEGAL_REQUEST 0x05
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#define UNIT_ATTENTION 0x06
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#define DATA_PROTECT 0x07
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#define BLANK_CHECK 0x08
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#define COPY_ABORTED 0x0a
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#define ABORTED_COMMAND 0x0b
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#define VOLUME_OVERFLOW 0x0d
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#define MISCOMPARE 0x0e
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/*
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* DEVICE TYPES
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* Please keep them in 0x%02x format for $MODALIAS to work
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*/
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#define TYPE_DISK 0x00
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#define TYPE_TAPE 0x01
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#define TYPE_PRINTER 0x02
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#define TYPE_PROCESSOR 0x03 /* HP scanners use this */
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#define TYPE_WORM 0x04 /* Treated as ROM by our system */
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#define TYPE_ROM 0x05
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#define TYPE_SCANNER 0x06
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#define TYPE_MOD 0x07 /* Magneto-optical disk -
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* - treated as TYPE_DISK */
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#define TYPE_MEDIUM_CHANGER 0x08
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#define TYPE_COMM 0x09 /* Communications device */
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#define TYPE_RAID 0x0c
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#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
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#define TYPE_RBC 0x0e
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#define TYPE_OSD 0x11
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#define TYPE_NO_LUN 0x7f
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/* SCSI protocols; these are taken from SPC-3 section 7.5 */
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enum scsi_protocol {
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SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
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SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
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SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
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SCSI_PROTOCOL_SBP = 3, /* firewire */
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SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
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SCSI_PROTOCOL_ISCSI = 5,
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SCSI_PROTOCOL_SAS = 6,
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SCSI_PROTOCOL_ADT = 7, /* Media Changers */
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SCSI_PROTOCOL_ATA = 8,
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SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
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};
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/* Returns a human-readable name for the device */
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extern const char * scsi_device_type(unsigned type);
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/*
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* standard mode-select header prepended to all mode-select commands
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*/
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struct ccs_modesel_head {
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__u8 _r1; /* reserved */
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__u8 medium; /* device-specific medium type */
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__u8 _r2; /* reserved */
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__u8 block_desc_length; /* block descriptor length */
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__u8 density; /* device-specific density code */
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__u8 number_blocks_hi; /* number of blocks in this block desc */
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__u8 number_blocks_med;
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__u8 number_blocks_lo;
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__u8 _r3;
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__u8 block_length_hi; /* block length for blocks in this desc */
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__u8 block_length_med;
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__u8 block_length_lo;
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};
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/*
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* ScsiLun: 8 byte LUN.
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*/
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struct scsi_lun {
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__u8 scsi_lun[8];
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};
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/*
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* The Well Known LUNS (SAM-3) in our int representation of a LUN
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*/
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#define SCSI_W_LUN_BASE 0xc100
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#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
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#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
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#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
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static inline int scsi_is_wlun(unsigned int lun)
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{
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return (lun & 0xff00) == SCSI_W_LUN_BASE;
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}
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/*
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* MESSAGE CODES
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*/
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#define COMMAND_COMPLETE 0x00
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#define EXTENDED_MESSAGE 0x01
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#define EXTENDED_MODIFY_DATA_POINTER 0x00
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#define EXTENDED_SDTR 0x01
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#define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
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#define EXTENDED_WDTR 0x03
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#define EXTENDED_PPR 0x04
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#define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
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#define SAVE_POINTERS 0x02
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#define RESTORE_POINTERS 0x03
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#define DISCONNECT 0x04
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#define INITIATOR_ERROR 0x05
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#define ABORT_TASK_SET 0x06
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#define MESSAGE_REJECT 0x07
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#define NOP 0x08
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#define MSG_PARITY_ERROR 0x09
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#define LINKED_CMD_COMPLETE 0x0a
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#define LINKED_FLG_CMD_COMPLETE 0x0b
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#define TARGET_RESET 0x0c
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#define ABORT_TASK 0x0d
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#define CLEAR_TASK_SET 0x0e
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#define INITIATE_RECOVERY 0x0f /* SCSI-II only */
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#define RELEASE_RECOVERY 0x10 /* SCSI-II only */
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#define CLEAR_ACA 0x16
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#define LOGICAL_UNIT_RESET 0x17
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#define SIMPLE_QUEUE_TAG 0x20
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#define HEAD_OF_QUEUE_TAG 0x21
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#define ORDERED_QUEUE_TAG 0x22
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#define IGNORE_WIDE_RESIDUE 0x23
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#define ACA 0x24
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#define QAS_REQUEST 0x55
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/* Old SCSI2 names, don't use in new code */
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#define BUS_DEVICE_RESET TARGET_RESET
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#define ABORT ABORT_TASK_SET
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/*
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* Host byte codes
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*/
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#define DID_OK 0x00 /* NO error */
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#define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
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#define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
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#define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
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#define DID_BAD_TARGET 0x04 /* BAD target. */
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#define DID_ABORT 0x05 /* Told to abort for some other reason */
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#define DID_PARITY 0x06 /* Parity error */
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#define DID_ERROR 0x07 /* Internal error */
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#define DID_RESET 0x08 /* Reset by somebody. */
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#define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
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#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
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#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
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#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
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#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
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* without decrementing the retry count */
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#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
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* and the driver blocked the port to
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* recover the link. Transport class will
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* retry or fail IO */
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#define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
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#define DRIVER_OK 0x00 /* Driver status */
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/*
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* These indicate the error that occurred, and what is available.
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*/
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#define DRIVER_BUSY 0x01
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#define DRIVER_SOFT 0x02
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#define DRIVER_MEDIA 0x03
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#define DRIVER_ERROR 0x04
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#define DRIVER_INVALID 0x05
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#define DRIVER_TIMEOUT 0x06
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#define DRIVER_HARD 0x07
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#define DRIVER_SENSE 0x08
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/*
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* Internal return values.
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*/
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#define NEEDS_RETRY 0x2001
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#define SUCCESS 0x2002
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#define FAILED 0x2003
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#define QUEUED 0x2004
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#define SOFT_ERROR 0x2005
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#define ADD_TO_MLQUEUE 0x2006
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#define TIMEOUT_ERROR 0x2007
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#define SCSI_RETURN_NOT_HANDLED 0x2008
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/*
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* Midlevel queue return values.
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*/
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#define SCSI_MLQUEUE_HOST_BUSY 0x1055
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#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
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#define SCSI_MLQUEUE_EH_RETRY 0x1057
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#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
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/*
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* Use these to separate status msg and our bytes
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*
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* These are set by:
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*
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* status byte = set from target device
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* msg_byte = return status from host adapter itself.
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* host_byte = set by low-level driver to indicate status.
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* driver_byte = set by mid-level.
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*/
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#define status_byte(result) (((result) >> 1) & 0x7f)
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#define msg_byte(result) (((result) >> 8) & 0xff)
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#define host_byte(result) (((result) >> 16) & 0xff)
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#define driver_byte(result) (((result) >> 24) & 0xff)
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#define sense_class(sense) (((sense) >> 4) & 0x7)
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#define sense_error(sense) ((sense) & 0xf)
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#define sense_valid(sense) ((sense) & 0x80);
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/*
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* default timeouts
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*/
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#define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
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#define START_STOP_TIMEOUT (60 * HZ)
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#define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
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#define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
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#define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
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#define IDENTIFY_BASE 0x80
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#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
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((can_disconnect) ? 0x40 : 0) |\
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((lun) & 0x07))
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/*
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* struct scsi_device::scsi_level values. For SCSI devices other than those
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* prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
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* where "resp" is a byte array of the response to an INQUIRY. The scsi_level
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* variable is visible to the user via sysfs.
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*/
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#define SCSI_UNKNOWN 0
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#define SCSI_1 1
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#define SCSI_1_CCS 2
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#define SCSI_2 3
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#define SCSI_3 4 /* SPC */
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#define SCSI_SPC_2 5
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#define SCSI_SPC_3 6
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/*
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* INQ PERIPHERAL QUALIFIERS
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*/
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#define SCSI_INQ_PQ_CON 0x00
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#define SCSI_INQ_PQ_NOT_CON 0x01
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#define SCSI_INQ_PQ_NOT_CAP 0x03
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/*
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* Here are some scsi specific ioctl commands which are sometimes useful.
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*
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* Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
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*/
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/* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
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#define SCSI_IOCTL_GET_IDLUN 0x5382
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/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
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/* Used to obtain the host number of a device. */
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#define SCSI_IOCTL_PROBE_HOST 0x5385
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/* Used to obtain the bus number for a device */
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#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
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/* Used to obtain the PCI location of a device */
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#define SCSI_IOCTL_GET_PCI 0x5387
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/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
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static inline __u32 scsi_to_u32(__u8 *ptr)
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{
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return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
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}
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#endif /* _SCSI_SCSI_H */
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