[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / scsi / scsi.h

/*
 * This header file contains public constants and structures used by
 * the scsi code for linux.
 *
 * For documentation on the OPCODES, MESSAGES, and SENSE values,
 * please consult the SCSI standard.
 */
#ifndef _SCSI_SCSI_H
#define _SCSI_SCSI_H

#include <linux/types.h>
#include <linux/scatterlist.h>

struct scsi_cmnd;

/*
 * The maximum number of SG segments that we will put inside a
 * scatterlist (unless chaining is used). Should ideally fit inside a
 * single page, to avoid a higher order allocation.  We could define this
 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
 * minimum value is 32
 */
#define SCSI_MAX_SG_SEGMENTS	128

/*
 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
 */
#ifdef ARCH_HAS_SG_CHAIN
#define SCSI_MAX_SG_CHAIN_SEGMENTS	2048
#else
#define SCSI_MAX_SG_CHAIN_SEGMENTS	SCSI_MAX_SG_SEGMENTS
#endif

/*
 * DIX-capable adapters effectively support infinite chaining for the
 * protection information scatterlist
 */
#define SCSI_MAX_PROT_SG_SEGMENTS	0xFFFF

/*
 * Special value for scanning to specify scanning or rescanning of all
 * possible channels, (target) ids, or luns on a given shost.
 */
#define SCAN_WILD_CARD	~0

/*
 *      SCSI opcodes
 */

#define TEST_UNIT_READY       0x00
#define REZERO_UNIT           0x01
#define REQUEST_SENSE         0x03
#define FORMAT_UNIT           0x04
#define READ_BLOCK_LIMITS     0x05
#define REASSIGN_BLOCKS       0x07
#define INITIALIZE_ELEMENT_STATUS 0x07
#define READ_6                0x08
#define WRITE_6               0x0a
#define SEEK_6                0x0b
#define READ_REVERSE          0x0f
#define WRITE_FILEMARKS       0x10
#define SPACE                 0x11
#define INQUIRY               0x12
#define RECOVER_BUFFERED_DATA 0x14
#define MODE_SELECT           0x15
#define RESERVE               0x16
#define RELEASE               0x17
#define COPY                  0x18
#define ERASE                 0x19
#define MODE_SENSE            0x1a
#define START_STOP            0x1b
#define RECEIVE_DIAGNOSTIC    0x1c
#define SEND_DIAGNOSTIC       0x1d
#define ALLOW_MEDIUM_REMOVAL  0x1e

#define READ_FORMAT_CAPACITIES 0x23
#define SET_WINDOW            0x24
#define READ_CAPACITY         0x25
#define READ_10               0x28
#define WRITE_10              0x2a
#define SEEK_10               0x2b
#define POSITION_TO_ELEMENT   0x2b
#define WRITE_VERIFY          0x2e
#define VERIFY                0x2f
#define SEARCH_HIGH           0x30
#define SEARCH_EQUAL          0x31
#define SEARCH_LOW            0x32
#define SET_LIMITS            0x33
#define PRE_FETCH             0x34
#define READ_POSITION         0x34
#define SYNCHRONIZE_CACHE     0x35
#define LOCK_UNLOCK_CACHE     0x36
#define READ_DEFECT_DATA      0x37
#define MEDIUM_SCAN           0x38
#define COMPARE               0x39
#define COPY_VERIFY           0x3a
#define WRITE_BUFFER          0x3b
#define READ_BUFFER           0x3c
#define UPDATE_BLOCK          0x3d
#define READ_LONG             0x3e
#define WRITE_LONG            0x3f
#define CHANGE_DEFINITION     0x40
#define WRITE_SAME            0x41
#define UNMAP		      0x42
#define READ_TOC              0x43
#define READ_HEADER           0x44
#define GET_EVENT_STATUS_NOTIFICATION 0x4a
#define LOG_SELECT            0x4c
#define LOG_SENSE             0x4d
#define XDWRITEREAD_10        0x53
#define MODE_SELECT_10        0x55
#define RESERVE_10            0x56
#define RELEASE_10            0x57
#define MODE_SENSE_10         0x5a
#define PERSISTENT_RESERVE_IN 0x5e
#define PERSISTENT_RESERVE_OUT 0x5f
#define VARIABLE_LENGTH_CMD   0x7f
#define REPORT_LUNS           0xa0
#define SECURITY_PROTOCOL_IN  0xa2
#define MAINTENANCE_IN        0xa3
#define MAINTENANCE_OUT       0xa4
#define MOVE_MEDIUM           0xa5
#define EXCHANGE_MEDIUM       0xa6
#define READ_12               0xa8
#define WRITE_12              0xaa
#define READ_MEDIA_SERIAL_NUMBER 0xab
#define WRITE_VERIFY_12       0xae
#define VERIFY_12	      0xaf
#define SEARCH_HIGH_12        0xb0
#define SEARCH_EQUAL_12       0xb1
#define SEARCH_LOW_12         0xb2
#define SECURITY_PROTOCOL_OUT 0xb5
#define READ_ELEMENT_STATUS   0xb8
#define SEND_VOLUME_TAG       0xb6
#define WRITE_LONG_2          0xea
#define EXTENDED_COPY         0x83
#define RECEIVE_COPY_RESULTS  0x84
#define ACCESS_CONTROL_IN     0x86
#define ACCESS_CONTROL_OUT    0x87
#define READ_16               0x88
#define WRITE_16              0x8a
#define READ_ATTRIBUTE        0x8c
#define WRITE_ATTRIBUTE	      0x8d
#define VERIFY_16	      0x8f
#define SYNCHRONIZE_CACHE_16  0x91
#define WRITE_SAME_16	      0x93
#define SERVICE_ACTION_IN     0x9e
/* values for service action in */
#define	SAI_READ_CAPACITY_16  0x10
#define SAI_GET_LBA_STATUS    0x12
/* values for VARIABLE_LENGTH_CMD service action codes
 * see spc4r17 Section D.3.5, table D.7 and D.8 */
#define VLC_SA_RECEIVE_CREDENTIAL 0x1800
/* values for maintenance in */
#define MI_REPORT_IDENTIFYING_INFORMATION 0x05
#define MI_REPORT_TARGET_PGS  0x0a
#define MI_REPORT_ALIASES     0x0b
#define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
#define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
#define MI_REPORT_PRIORITY   0x0e
#define MI_REPORT_TIMESTAMP  0x0f
#define MI_MANAGEMENT_PROTOCOL_IN 0x10
/* value for MI_REPORT_TARGET_PGS ext header */
#define MI_EXT_HDR_PARAM_FMT  0x20
/* values for maintenance out */
#define MO_SET_IDENTIFYING_INFORMATION 0x06
#define MO_SET_TARGET_PGS     0x0a
#define MO_CHANGE_ALIASES     0x0b
#define MO_SET_PRIORITY       0x0e
#define MO_SET_TIMESTAMP      0x0f
#define MO_MANAGEMENT_PROTOCOL_OUT 0x10
/* values for variable length command */
#define XDREAD_32	      0x03
#define XDWRITE_32	      0x04
#define XPWRITE_32	      0x06
#define XDWRITEREAD_32	      0x07
#define READ_32		      0x09
#define VERIFY_32	      0x0a
#define WRITE_32	      0x0b
#define WRITE_SAME_32	      0x0d

/* Values for T10/04-262r7 */
#define	ATA_16		      0x85	/* 16-byte pass-thru */
#define	ATA_12		      0xa1	/* 12-byte pass-thru */

/*
 *	SCSI command lengths
 */

#define SCSI_MAX_VARLEN_CDB_SIZE 260

/* defined in T10 SCSI Primary Commands-2 (SPC2) */
struct scsi_varlen_cdb_hdr {
	__u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
	__u8 control;
	__u8 misc[5];
	__u8 additional_cdb_length;         /* total cdb length - 8 */
	__be16 service_action;
	/* service specific data follows */
};

static inline unsigned
scsi_varlen_cdb_length(const void *hdr)
{
	return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
}

extern const unsigned char scsi_command_size_tbl[8];
#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]

static inline unsigned
scsi_command_size(const unsigned char *cmnd)
{
	return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
		scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
}

#ifdef CONFIG_ACPI
struct acpi_bus_type;

extern int
scsi_register_acpi_bus_type(struct acpi_bus_type *bus);

extern void
scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
#endif

/*
 *  SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
 *  T10/1561-D Revision 4 Draft dated 7th November 2002.
 */
#define SAM_STAT_GOOD            0x00
#define SAM_STAT_CHECK_CONDITION 0x02
#define SAM_STAT_CONDITION_MET   0x04
#define SAM_STAT_BUSY            0x08
#define SAM_STAT_INTERMEDIATE    0x10
#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
#define SAM_STAT_RESERVATION_CONFLICT 0x18
#define SAM_STAT_COMMAND_TERMINATED 0x22	/* obsolete in SAM-3 */
#define SAM_STAT_TASK_SET_FULL   0x28
#define SAM_STAT_ACA_ACTIVE      0x30
#define SAM_STAT_TASK_ABORTED    0x40

/** scsi_status_is_good - check the status return.
 *
 * @status: the status passed up from the driver (including host and
 *          driver components)
 *
 * This returns true for known good conditions that may be treated as
 * command completed normally
 */
static inline int scsi_status_is_good(int status)
{
	/*
	 * FIXME: bit0 is listed as reserved in SCSI-2, but is
	 * significant in SCSI-3.  For now, we follow the SCSI-2
	 * behaviour and ignore reserved bits.
	 */
	status &= 0xfe;
	return ((status == SAM_STAT_GOOD) ||
		(status == SAM_STAT_INTERMEDIATE) ||
		(status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
		/* FIXME: this is obsolete in SAM-3 */
		(status == SAM_STAT_COMMAND_TERMINATED));
}

/*
 *  Status codes. These are deprecated as they are shifted 1 bit right
 *  from those found in the SCSI standards. This causes confusion for
 *  applications that are ported to several OSes. Prefer SAM Status codes
 *  above.
 */

#define GOOD                 0x00
#define CHECK_CONDITION      0x01
#define CONDITION_GOOD       0x02
#define BUSY                 0x04
#define INTERMEDIATE_GOOD    0x08
#define INTERMEDIATE_C_GOOD  0x0a
#define RESERVATION_CONFLICT 0x0c
#define COMMAND_TERMINATED   0x11
#define QUEUE_FULL           0x14
#define ACA_ACTIVE           0x18
#define TASK_ABORTED         0x20

#define STATUS_MASK          0xfe

/*
 *  SENSE KEYS
 */

#define NO_SENSE            0x00
#define RECOVERED_ERROR     0x01
#define NOT_READY           0x02
#define MEDIUM_ERROR        0x03
#define HARDWARE_ERROR      0x04
#define ILLEGAL_REQUEST     0x05
#define UNIT_ATTENTION      0x06
#define DATA_PROTECT        0x07
#define BLANK_CHECK         0x08
#define COPY_ABORTED        0x0a
#define ABORTED_COMMAND     0x0b
#define VOLUME_OVERFLOW     0x0d
#define MISCOMPARE          0x0e


/*
 *  DEVICE TYPES
 *  Please keep them in 0x%02x format for $MODALIAS to work
 */

#define TYPE_DISK           0x00
#define TYPE_TAPE           0x01
#define TYPE_PRINTER        0x02
#define TYPE_PROCESSOR      0x03    /* HP scanners use this */
#define TYPE_WORM           0x04    /* Treated as ROM by our system */
#define TYPE_ROM            0x05
#define TYPE_SCANNER        0x06
#define TYPE_MOD            0x07    /* Magneto-optical disk - 
				     * - treated as TYPE_DISK */
#define TYPE_MEDIUM_CHANGER 0x08
#define TYPE_COMM           0x09    /* Communications device */
#define TYPE_RAID           0x0c
#define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
#define TYPE_RBC	    0x0e
#define TYPE_OSD            0x11
#define TYPE_NO_LUN         0x7f

/* SCSI protocols; these are taken from SPC-3 section 7.5 */
enum scsi_protocol {
	SCSI_PROTOCOL_FCP = 0,	/* Fibre Channel */
	SCSI_PROTOCOL_SPI = 1,	/* parallel SCSI */
	SCSI_PROTOCOL_SSA = 2,	/* Serial Storage Architecture - Obsolete */
	SCSI_PROTOCOL_SBP = 3,	/* firewire */
	SCSI_PROTOCOL_SRP = 4,	/* Infiniband RDMA */
	SCSI_PROTOCOL_ISCSI = 5,
	SCSI_PROTOCOL_SAS = 6,
	SCSI_PROTOCOL_ADT = 7,	/* Media Changers */
	SCSI_PROTOCOL_ATA = 8,
	SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
};

/* Returns a human-readable name for the device */
extern const char * scsi_device_type(unsigned type);

/*
 * standard mode-select header prepended to all mode-select commands
 */

struct ccs_modesel_head {
	__u8 _r1;			/* reserved */
	__u8 medium;		/* device-specific medium type */
	__u8 _r2;			/* reserved */
	__u8 block_desc_length;	/* block descriptor length */
	__u8 density;		/* device-specific density code */
	__u8 number_blocks_hi;	/* number of blocks in this block desc */
	__u8 number_blocks_med;
	__u8 number_blocks_lo;
	__u8 _r3;
	__u8 block_length_hi;	/* block length for blocks in this desc */
	__u8 block_length_med;
	__u8 block_length_lo;
};

/*
 * ScsiLun: 8 byte LUN.
 */
struct scsi_lun {
	__u8 scsi_lun[8];
};

/*
 * The Well Known LUNS (SAM-3) in our int representation of a LUN
 */
#define SCSI_W_LUN_BASE 0xc100
#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)

static inline int scsi_is_wlun(unsigned int lun)
{
	return (lun & 0xff00) == SCSI_W_LUN_BASE;
}


/*
 *  MESSAGE CODES
 */

#define COMMAND_COMPLETE    0x00
#define EXTENDED_MESSAGE    0x01
#define     EXTENDED_MODIFY_DATA_POINTER    0x00
#define     EXTENDED_SDTR                   0x01
#define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
#define     EXTENDED_WDTR                   0x03
#define     EXTENDED_PPR                    0x04
#define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05
#define SAVE_POINTERS       0x02
#define RESTORE_POINTERS    0x03
#define DISCONNECT          0x04
#define INITIATOR_ERROR     0x05
#define ABORT_TASK_SET      0x06
#define MESSAGE_REJECT      0x07
#define NOP                 0x08
#define MSG_PARITY_ERROR    0x09
#define LINKED_CMD_COMPLETE 0x0a
#define LINKED_FLG_CMD_COMPLETE 0x0b
#define TARGET_RESET        0x0c
#define ABORT_TASK          0x0d
#define CLEAR_TASK_SET      0x0e
#define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
#define RELEASE_RECOVERY    0x10            /* SCSI-II only */
#define CLEAR_ACA           0x16
#define LOGICAL_UNIT_RESET  0x17
#define SIMPLE_QUEUE_TAG    0x20
#define HEAD_OF_QUEUE_TAG   0x21
#define ORDERED_QUEUE_TAG   0x22
#define IGNORE_WIDE_RESIDUE 0x23
#define ACA                 0x24
#define QAS_REQUEST         0x55

/* Old SCSI2 names, don't use in new code */
#define BUS_DEVICE_RESET    TARGET_RESET
#define ABORT               ABORT_TASK_SET

/*
 * Host byte codes
 */

#define DID_OK          0x00	/* NO error                                */
#define DID_NO_CONNECT  0x01	/* Couldn't connect before timeout period  */
#define DID_BUS_BUSY    0x02	/* BUS stayed busy through time out period */
#define DID_TIME_OUT    0x03	/* TIMED OUT for other reason              */
#define DID_BAD_TARGET  0x04	/* BAD target.                             */
#define DID_ABORT       0x05	/* Told to abort for some other reason     */
#define DID_PARITY      0x06	/* Parity error                            */
#define DID_ERROR       0x07	/* Internal error                          */
#define DID_RESET       0x08	/* Reset by somebody.                      */
#define DID_BAD_INTR    0x09	/* Got an interrupt we weren't expecting.  */
#define DID_PASSTHROUGH 0x0a	/* Force command past mid-layer            */
#define DID_SOFT_ERROR  0x0b	/* The low level driver just wish a retry  */
#define DID_IMM_RETRY   0x0c	/* Retry without decrementing retry count  */
#define DID_REQUEUE	0x0d	/* Requeue command (no immediate retry) also
				 * without decrementing the retry count	   */
#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
				      * and the driver blocked the port to
				      * recover the link. Transport class will
				      * retry or fail IO */
#define DID_TRANSPORT_FAILFAST	0x0f /* Transport class fastfailed the io */
#define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
				 * other paths */
#define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
				 * paths might yield different results */
#define DRIVER_OK       0x00	/* Driver status                           */

/*
 *  These indicate the error that occurred, and what is available.
 */

#define DRIVER_BUSY         0x01
#define DRIVER_SOFT         0x02
#define DRIVER_MEDIA        0x03
#define DRIVER_ERROR        0x04

#define DRIVER_INVALID      0x05
#define DRIVER_TIMEOUT      0x06
#define DRIVER_HARD         0x07
#define DRIVER_SENSE	    0x08

/*
 * Internal return values.
 */

#define NEEDS_RETRY     0x2001
#define SUCCESS         0x2002
#define FAILED          0x2003
#define QUEUED          0x2004
#define SOFT_ERROR      0x2005
#define ADD_TO_MLQUEUE  0x2006
#define TIMEOUT_ERROR   0x2007
#define SCSI_RETURN_NOT_HANDLED   0x2008
#define FAST_IO_FAIL	0x2009
#define TARGET_ERROR    0x200A

/*
 * Midlevel queue return values.
 */
#define SCSI_MLQUEUE_HOST_BUSY   0x1055
#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
#define SCSI_MLQUEUE_EH_RETRY    0x1057
#define SCSI_MLQUEUE_TARGET_BUSY 0x1058

/*
 *  Use these to separate status msg and our bytes
 *
 *  These are set by:
 *
 *      status byte = set from target device
 *      msg_byte    = return status from host adapter itself.
 *      host_byte   = set by low-level driver to indicate status.
 *      driver_byte = set by mid-level.
 */
#define status_byte(result) (((result) >> 1) & 0x7f)
#define msg_byte(result)    (((result) >> 8) & 0xff)
#define host_byte(result)   (((result) >> 16) & 0xff)
#define driver_byte(result) (((result) >> 24) & 0xff)

#define sense_class(sense)  (((sense) >> 4) & 0x7)
#define sense_error(sense)  ((sense) & 0xf)
#define sense_valid(sense)  ((sense) & 0x80)

/*
 * default timeouts
*/
#define FORMAT_UNIT_TIMEOUT		(2 * 60 * 60 * HZ)
#define START_STOP_TIMEOUT		(60 * HZ)
#define MOVE_MEDIUM_TIMEOUT		(5 * 60 * HZ)
#define READ_ELEMENT_STATUS_TIMEOUT	(5 * 60 * HZ)
#define READ_DEFECT_DATA_TIMEOUT	(60 * HZ )


#define IDENTIFY_BASE       0x80
#define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
		     ((can_disconnect) ?  0x40 : 0) |\
		     ((lun) & 0x07))

/*
 *  struct scsi_device::scsi_level values. For SCSI devices other than those
 *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 *  variable is visible to the user via sysfs.
 */

#define SCSI_UNKNOWN    0
#define SCSI_1          1
#define SCSI_1_CCS      2
#define SCSI_2          3
#define SCSI_3          4        /* SPC */
#define SCSI_SPC_2      5
#define SCSI_SPC_3      6

/*
 * INQ PERIPHERAL QUALIFIERS
 */
#define SCSI_INQ_PQ_CON         0x00
#define SCSI_INQ_PQ_NOT_CON     0x01
#define SCSI_INQ_PQ_NOT_CAP     0x03


/*
 * Here are some scsi specific ioctl commands which are sometimes useful.
 *
 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 */

/* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
#define SCSI_IOCTL_GET_IDLUN		0x5382

/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */

/* Used to obtain the host number of a device. */
#define SCSI_IOCTL_PROBE_HOST		0x5385

/* Used to obtain the bus number for a device */
#define SCSI_IOCTL_GET_BUS_NUMBER	0x5386

/* Used to obtain the PCI location of a device */
#define SCSI_IOCTL_GET_PCI		0x5387

/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
static inline __u32 scsi_to_u32(__u8 *ptr)
{
	return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
}

#endif /* _SCSI_SCSI_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This header file contains public constants and structures used by
	3	* the scsi code for linux.
	4	*
	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
	10
	11	#include <linux/types.h>
ac61c46f	12	#include <linux/scatterlist.h>
f290f197 JB	13
f290f197 JB	14	struct scsi_cmnd;
1da177e4	15
d3f46f39 JB	16	/*
	17	* The maximum number of SG segments that we will put inside a
	18	* scatterlist (unless chaining is used). Should ideally fit inside a
	19	* single page, to avoid a higher order allocation. We could define this
	20	* to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
	21	* minimum value is 32
	22	*/
	23	#define SCSI_MAX_SG_SEGMENTS 128
	24
	25	/*
	26	* Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
	27	* is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
	28	*/
	29	#ifdef ARCH_HAS_SG_CHAIN
	30	#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
	31	#else
	32	#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
	33	#endif
	34
13f05c8d MP	35	/*
	36	* DIX-capable adapters effectively support infinite chaining for the
	37	* protection information scatterlist
	38	*/
	39	#define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
	40
e02f3f59 CH	41	/*
	42	* Special value for scanning to specify scanning or rescanning of all
	43	* possible channels, (target) ids, or luns on a given shost.
	44	*/
	45	#define SCAN_WILD_CARD ~0
	46
1da177e4 LT	47	/*
	48	* SCSI opcodes
	49	*/
	50
	51	#define TEST_UNIT_READY 0x00
	52	#define REZERO_UNIT 0x01
	53	#define REQUEST_SENSE 0x03
	54	#define FORMAT_UNIT 0x04
	55	#define READ_BLOCK_LIMITS 0x05
	56	#define REASSIGN_BLOCKS 0x07
daa6eda6	57	#define INITIALIZE_ELEMENT_STATUS 0x07
1da177e4 LT	58	#define READ_6 0x08
	59	#define WRITE_6 0x0a
	60	#define SEEK_6 0x0b
	61	#define READ_REVERSE 0x0f
	62	#define WRITE_FILEMARKS 0x10
	63	#define SPACE 0x11
	64	#define INQUIRY 0x12
	65	#define RECOVER_BUFFERED_DATA 0x14
	66	#define MODE_SELECT 0x15
	67	#define RESERVE 0x16
	68	#define RELEASE 0x17
	69	#define COPY 0x18
	70	#define ERASE 0x19
	71	#define MODE_SENSE 0x1a
	72	#define START_STOP 0x1b
	73	#define RECEIVE_DIAGNOSTIC 0x1c
	74	#define SEND_DIAGNOSTIC 0x1d
	75	#define ALLOW_MEDIUM_REMOVAL 0x1e
	76
0a6a717c	77	#define READ_FORMAT_CAPACITIES 0x23
1da177e4 LT	78	#define SET_WINDOW 0x24
	79	#define READ_CAPACITY 0x25
	80	#define READ_10 0x28
	81	#define WRITE_10 0x2a
	82	#define SEEK_10 0x2b
daa6eda6	83	#define POSITION_TO_ELEMENT 0x2b
1da177e4 LT	84	#define WRITE_VERIFY 0x2e
	85	#define VERIFY 0x2f
	86	#define SEARCH_HIGH 0x30
	87	#define SEARCH_EQUAL 0x31
	88	#define SEARCH_LOW 0x32
	89	#define SET_LIMITS 0x33
	90	#define PRE_FETCH 0x34
	91	#define READ_POSITION 0x34
	92	#define SYNCHRONIZE_CACHE 0x35
	93	#define LOCK_UNLOCK_CACHE 0x36
	94	#define READ_DEFECT_DATA 0x37
	95	#define MEDIUM_SCAN 0x38
	96	#define COMPARE 0x39
	97	#define COPY_VERIFY 0x3a
	98	#define WRITE_BUFFER 0x3b
	99	#define READ_BUFFER 0x3c
	100	#define UPDATE_BLOCK 0x3d
	101	#define READ_LONG 0x3e
	102	#define WRITE_LONG 0x3f
	103	#define CHANGE_DEFINITION 0x40
	104	#define WRITE_SAME 0x41
f57e4502	105	#define UNMAP 0x42
1da177e4	106	#define READ_TOC 0x43
0a6a717c	107	#define READ_HEADER 0x44
93aae17a	108	#define GET_EVENT_STATUS_NOTIFICATION 0x4a
1da177e4 LT	109	#define LOG_SELECT 0x4c
1da177e4 LT	110	#define LOG_SENSE 0x4d
c639d14e	111	#define XDWRITEREAD_10 0x53
1da177e4 LT	112	#define MODE_SELECT_10 0x55
	113	#define RESERVE_10 0x56
	114	#define RELEASE_10 0x57
	115	#define MODE_SENSE_10 0x5a
	116	#define PERSISTENT_RESERVE_IN 0x5e
	117	#define PERSISTENT_RESERVE_OUT 0x5f
db4742dd	118	#define VARIABLE_LENGTH_CMD 0x7f
1da177e4	119	#define REPORT_LUNS 0xa0
e9ccc998	120	#define SECURITY_PROTOCOL_IN 0xa2
5a09e398	121	#define MAINTENANCE_IN 0xa3
057ea7c9	122	#define MAINTENANCE_OUT 0xa4
1da177e4	123	#define MOVE_MEDIUM 0xa5
daa6eda6	124	#define EXCHANGE_MEDIUM 0xa6
1da177e4 LT	125	#define READ_12 0xa8
1da177e4 LT	126	#define WRITE_12 0xaa
e9ccc998	127	#define READ_MEDIA_SERIAL_NUMBER 0xab
1da177e4	128	#define WRITE_VERIFY_12 0xae
59c31b69	129	#define VERIFY_12 0xaf
1da177e4 LT	130	#define SEARCH_HIGH_12 0xb0
	131	#define SEARCH_EQUAL_12 0xb1
	132	#define SEARCH_LOW_12 0xb2
e9ccc998	133	#define SECURITY_PROTOCOL_OUT 0xb5
1da177e4 LT	134	#define READ_ELEMENT_STATUS 0xb8
	135	#define SEND_VOLUME_TAG 0xb6
	136	#define WRITE_LONG_2 0xea
e9ccc998 NB	137	#define EXTENDED_COPY 0x83
	138	#define RECEIVE_COPY_RESULTS 0x84
	139	#define ACCESS_CONTROL_IN 0x86
	140	#define ACCESS_CONTROL_OUT 0x87
1da177e4 LT	141	#define READ_16 0x88
1da177e4 LT	142	#define WRITE_16 0x8a
e9ccc998 NB	143	#define READ_ATTRIBUTE 0x8c
e9ccc998 NB	144	#define WRITE_ATTRIBUTE 0x8d
1da177e4	145	#define VERIFY_16 0x8f
cd0c72c1	146	#define SYNCHRONIZE_CACHE_16 0x91
f57e4502	147	#define WRITE_SAME_16 0x93
1da177e4 LT	148	#define SERVICE_ACTION_IN 0x9e
	149	/* values for service action in */
	150	#define SAI_READ_CAPACITY_16 0x10
f57e4502	151	#define SAI_GET_LBA_STATUS 0x12
e9ccc998 NB	152	/* values for VARIABLE_LENGTH_CMD service action codes
	153	* see spc4r17 Section D.3.5, table D.7 and D.8 */
	154	#define VLC_SA_RECEIVE_CREDENTIAL 0x1800
5a09e398	155	/* values for maintenance in */
e9ccc998	156	#define MI_REPORT_IDENTIFYING_INFORMATION 0x05
5a09e398	157	#define MI_REPORT_TARGET_PGS 0x0a
e9ccc998 NB	158	#define MI_REPORT_ALIASES 0x0b
	159	#define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
	160	#define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
	161	#define MI_REPORT_PRIORITY 0x0e
	162	#define MI_REPORT_TIMESTAMP 0x0f
	163	#define MI_MANAGEMENT_PROTOCOL_IN 0x10
3588c5a2 RE	164	/* value for MI_REPORT_TARGET_PGS ext header */
3588c5a2 RE	165	#define MI_EXT_HDR_PARAM_FMT 0x20
057ea7c9	166	/* values for maintenance out */
e9ccc998	167	#define MO_SET_IDENTIFYING_INFORMATION 0x06
057ea7c9	168	#define MO_SET_TARGET_PGS 0x0a
e9ccc998 NB	169	#define MO_CHANGE_ALIASES 0x0b
	170	#define MO_SET_PRIORITY 0x0e
	171	#define MO_SET_TIMESTAMP 0x0f
	172	#define MO_MANAGEMENT_PROTOCOL_OUT 0x10
4e7392ec	173	/* values for variable length command */
e9ccc998 NB	174	#define XDREAD_32 0x03
	175	#define XDWRITE_32 0x04
	176	#define XPWRITE_32 0x06
	177	#define XDWRITEREAD_32 0x07
4e7392ec	178	#define READ_32 0x09
59c31b69	179	#define VERIFY_32 0x0a
4e7392ec	180	#define WRITE_32 0x0b
f57e4502	181	#define WRITE_SAME_32 0x0d
1da177e4	182
b095518e JG	183	/* Values for T10/04-262r7 */
	184	#define ATA_16 0x85 /* 16-byte pass-thru */
	185	#define ATA_12 0xa1 /* 12-byte pass-thru */
1da177e4	186
db4742dd BH	187	/*
	188	* SCSI command lengths
	189	*/
	190
	191	#define SCSI_MAX_VARLEN_CDB_SIZE 260
	192
	193	/* defined in T10 SCSI Primary Commands-2 (SPC2) */
	194	struct scsi_varlen_cdb_hdr {
083c8c1e PK	195	__u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
	196	__u8 control;
	197	__u8 misc[5];
	198	__u8 additional_cdb_length; /* total cdb length - 8 */
db4742dd BH	199	__be16 service_action;
	200	/* service specific data follows */
	201	};
	202
	203	static inline unsigned
	204	scsi_varlen_cdb_length(const void *hdr)
	205	{
	206	return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
	207	}
	208
	209	extern const unsigned char scsi_command_size_tbl[8];
	210	#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
	211
	212	static inline unsigned
	213	scsi_command_size(const unsigned char *cmnd)
	214	{
	215	return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
	216	scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
	217	}
	218
de50ada5 HM	219	#ifdef CONFIG_ACPI
	220	struct acpi_bus_type;
	221
	222	extern int
	223	scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
	224
	225	extern void
	226	scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
	227	#endif
	228
1da177e4 LT	229	/*
	230	* SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
	231	* T10/1561-D Revision 4 Draft dated 7th November 2002.
	232	*/
	233	#define SAM_STAT_GOOD 0x00
	234	#define SAM_STAT_CHECK_CONDITION 0x02
	235	#define SAM_STAT_CONDITION_MET 0x04
	236	#define SAM_STAT_BUSY 0x08
	237	#define SAM_STAT_INTERMEDIATE 0x10
	238	#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
	239	#define SAM_STAT_RESERVATION_CONFLICT 0x18
	240	#define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
	241	#define SAM_STAT_TASK_SET_FULL 0x28
	242	#define SAM_STAT_ACA_ACTIVE 0x30
	243	#define SAM_STAT_TASK_ABORTED 0x40
	244
	245	/** scsi_status_is_good - check the status return.
	246	*
	247	* @status: the status passed up from the driver (including host and
	248	* driver components)
	249	*
	250	* This returns true for known good conditions that may be treated as
	251	* command completed normally
	252	*/
	253	static inline int scsi_status_is_good(int status)
	254	{
	255	/*
	256	* FIXME: bit0 is listed as reserved in SCSI-2, but is
	257	* significant in SCSI-3. For now, we follow the SCSI-2
	258	* behaviour and ignore reserved bits.
	259	*/
	260	status &= 0xfe;
	261	return ((status == SAM_STAT_GOOD) \|\|
	262	(status == SAM_STAT_INTERMEDIATE) \|\|
	263	(status == SAM_STAT_INTERMEDIATE_CONDITION_MET) \|\|
	264	/* FIXME: this is obsolete in SAM-3 */
	265	(status == SAM_STAT_COMMAND_TERMINATED));
	266	}
	267
	268	/*
	269	* Status codes. These are deprecated as they are shifted 1 bit right
	270	* from those found in the SCSI standards. This causes confusion for
	271	* applications that are ported to several OSes. Prefer SAM Status codes
	272	* above.
	273	*/
	274
	275	#define GOOD 0x00
	276	#define CHECK_CONDITION 0x01
	277	#define CONDITION_GOOD 0x02
	278	#define BUSY 0x04
	279	#define INTERMEDIATE_GOOD 0x08
	280	#define INTERMEDIATE_C_GOOD 0x0a
	281	#define RESERVATION_CONFLICT 0x0c
	282	#define COMMAND_TERMINATED 0x11
	283	#define QUEUE_FULL 0x14
	284	#define ACA_ACTIVE 0x18
	285	#define TASK_ABORTED 0x20
	286
	287	#define STATUS_MASK 0xfe
	288
	289	/*
	290	* SENSE KEYS
	291	*/
	292
293	#define NO_SENSE 0x00
294	#define RECOVERED_ERROR 0x01
295	#define NOT_READY 0x02
296	#define MEDIUM_ERROR 0x03
297	#define HARDWARE_ERROR 0x04
298	#define ILLEGAL_REQUEST 0x05
299	#define UNIT_ATTENTION 0x06
300	#define DATA_PROTECT 0x07
301	#define BLANK_CHECK 0x08
302	#define COPY_ABORTED 0x0a
303	#define ABORTED_COMMAND 0x0b
304	#define VOLUME_OVERFLOW 0x0d
305	#define MISCOMPARE 0x0e
306
307
308	/*
309	* DEVICE TYPES
d7b8bcb0	310	* Please keep them in 0x%02x format for $MODALIAS to work
1da177e4 LT	311	*/
	312
	313	#define TYPE_DISK 0x00
	314	#define TYPE_TAPE 0x01
	315	#define TYPE_PRINTER 0x02
	316	#define TYPE_PROCESSOR 0x03 /* HP scanners use this */
	317	#define TYPE_WORM 0x04 /* Treated as ROM by our system */
	318	#define TYPE_ROM 0x05
	319	#define TYPE_SCANNER 0x06
	320	#define TYPE_MOD 0x07 /* Magneto-optical disk -
	321	* - treated as TYPE_DISK */
	322	#define TYPE_MEDIUM_CHANGER 0x08
	323	#define TYPE_COMM 0x09 /* Communications device */
1da177e4	324	#define TYPE_RAID 0x0c
7f602c53	325	#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
631e8a13	326	#define TYPE_RBC 0x0e
82443a58	327	#define TYPE_OSD 0x11
1da177e4 LT	328	#define TYPE_NO_LUN 0x7f
1da177e4 LT	329
89dddbce JB	330	/* SCSI protocols; these are taken from SPC-3 section 7.5 */
	331	enum scsi_protocol {
	332	SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
	333	SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
	334	SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
	335	SCSI_PROTOCOL_SBP = 3, /* firewire */
	336	SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
	337	SCSI_PROTOCOL_ISCSI = 5,
	338	SCSI_PROTOCOL_SAS = 6,
	339	SCSI_PROTOCOL_ADT = 7, /* Media Changers */
	340	SCSI_PROTOCOL_ATA = 8,
	341	SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
	342	};
	343
4ff36718 MW	344	/* Returns a human-readable name for the device */
	345	extern const char * scsi_device_type(unsigned type);
	346
1da177e4 LT	347	/*
	348	* standard mode-select header prepended to all mode-select commands
	349	*/
	350
	351	struct ccs_modesel_head {
	352	__u8 _r1; /* reserved */
	353	__u8 medium; /* device-specific medium type */
	354	__u8 _r2; /* reserved */
	355	__u8 block_desc_length; /* block descriptor length */
	356	__u8 density; /* device-specific density code */
	357	__u8 number_blocks_hi; /* number of blocks in this block desc */
	358	__u8 number_blocks_med;
	359	__u8 number_blocks_lo;
	360	__u8 _r3;
	361	__u8 block_length_hi; /* block length for blocks in this desc */
	362	__u8 block_length_med;
	363	__u8 block_length_lo;
	364	};
	365
	366	/*
	367	* ScsiLun: 8 byte LUN.
	368	*/
	369	struct scsi_lun {
	370	__u8 scsi_lun[8];
	371	};
	372
01b291bd JB	373	/*
	374	* The Well Known LUNS (SAM-3) in our int representation of a LUN
	375	*/
	376	#define SCSI_W_LUN_BASE 0xc100
	377	#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
	378	#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
	379	#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
	380
	381	static inline int scsi_is_wlun(unsigned int lun)
	382	{
	383	return (lun & 0xff00) == SCSI_W_LUN_BASE;
	384	}
	385
	386
1da177e4 LT	387	/*
	388	* MESSAGE CODES
	389	*/
	390
	391	#define COMMAND_COMPLETE 0x00
	392	#define EXTENDED_MESSAGE 0x01
	393	#define EXTENDED_MODIFY_DATA_POINTER 0x00
	394	#define EXTENDED_SDTR 0x01
	395	#define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
	396	#define EXTENDED_WDTR 0x03
	397	#define EXTENDED_PPR 0x04
	398	#define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
	399	#define SAVE_POINTERS 0x02
	400	#define RESTORE_POINTERS 0x03
	401	#define DISCONNECT 0x04
	402	#define INITIATOR_ERROR 0x05
	403	#define ABORT_TASK_SET 0x06
	404	#define MESSAGE_REJECT 0x07
	405	#define NOP 0x08
	406	#define MSG_PARITY_ERROR 0x09
	407	#define LINKED_CMD_COMPLETE 0x0a
	408	#define LINKED_FLG_CMD_COMPLETE 0x0b
	409	#define TARGET_RESET 0x0c
	410	#define ABORT_TASK 0x0d
	411	#define CLEAR_TASK_SET 0x0e
	412	#define INITIATE_RECOVERY 0x0f /* SCSI-II only */
	413	#define RELEASE_RECOVERY 0x10 /* SCSI-II only */
	414	#define CLEAR_ACA 0x16
	415	#define LOGICAL_UNIT_RESET 0x17
	416	#define SIMPLE_QUEUE_TAG 0x20
	417	#define HEAD_OF_QUEUE_TAG 0x21
	418	#define ORDERED_QUEUE_TAG 0x22
	419	#define IGNORE_WIDE_RESIDUE 0x23
	420	#define ACA 0x24
	421	#define QAS_REQUEST 0x55
	422
	423	/* Old SCSI2 names, don't use in new code */
	424	#define BUS_DEVICE_RESET TARGET_RESET
	425	#define ABORT ABORT_TASK_SET
	426
	427	/*
	428	* Host byte codes
	429	*/
	430
	431	#define DID_OK 0x00 /* NO error */
	432	#define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
	433	#define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
	434	#define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
	435	#define DID_BAD_TARGET 0x04 /* BAD target. */
	436	#define DID_ABORT 0x05 /* Told to abort for some other reason */
	437	#define DID_PARITY 0x06 /* Parity error */
	438	#define DID_ERROR 0x07 /* Internal error */
	439	#define DID_RESET 0x08 /* Reset by somebody. */
	440	#define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
	441	#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
	442	#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
	443	#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
bf341919 JB	444	#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
bf341919 JB	445	* without decrementing the retry count */
a4dfaa6f MC	446	#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
	447	* and the driver blocked the port to
	448	* recover the link. Transport class will
	449	* retry or fail IO */
	450	#define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
63583cca HR	451	#define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
	452	* other paths */
	453	#define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
	454	* paths might yield different results */
1da177e4 LT	455	#define DRIVER_OK 0x00 /* Driver status */
	456
	457	/*
	458	* These indicate the error that occurred, and what is available.
	459	*/
	460
	461	#define DRIVER_BUSY 0x01
	462	#define DRIVER_SOFT 0x02
	463	#define DRIVER_MEDIA 0x03
	464	#define DRIVER_ERROR 0x04
	465
	466	#define DRIVER_INVALID 0x05
	467	#define DRIVER_TIMEOUT 0x06
	468	#define DRIVER_HARD 0x07
	469	#define DRIVER_SENSE 0x08
	470
1da177e4 LT	471	/*
	472	* Internal return values.
	473	*/
	474
	475	#define NEEDS_RETRY 0x2001
	476	#define SUCCESS 0x2002
	477	#define FAILED 0x2003
	478	#define QUEUED 0x2004
	479	#define SOFT_ERROR 0x2005
	480	#define ADD_TO_MLQUEUE 0x2006
	481	#define TIMEOUT_ERROR 0x2007
a6a8d9f8	482	#define SCSI_RETURN_NOT_HANDLED 0x2008
2f2eb587	483	#define FAST_IO_FAIL 0x2009
63583cca	484	#define TARGET_ERROR 0x200A
1da177e4 LT	485
	486	/*
	487	* Midlevel queue return values.
	488	*/
	489	#define SCSI_MLQUEUE_HOST_BUSY 0x1055
	490	#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
	491	#define SCSI_MLQUEUE_EH_RETRY 0x1057
f0c0a376	492	#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
1da177e4 LT	493
	494	/*
	495	* Use these to separate status msg and our bytes
	496	*
	497	* These are set by:
	498	*
	499	* status byte = set from target device
	500	* msg_byte = return status from host adapter itself.
	501	* host_byte = set by low-level driver to indicate status.
	502	* driver_byte = set by mid-level.
	503	*/
	504	#define status_byte(result) (((result) >> 1) & 0x7f)
	505	#define msg_byte(result) (((result) >> 8) & 0xff)
	506	#define host_byte(result) (((result) >> 16) & 0xff)
	507	#define driver_byte(result) (((result) >> 24) & 0xff)
1da177e4 LT	508
	509	#define sense_class(sense) (((sense) >> 4) & 0x7)
	510	#define sense_error(sense) ((sense) & 0xf)
497888cf	511	#define sense_valid(sense) ((sense) & 0x80)
1da177e4	512
b6651129 CH	513	/*
	514	* default timeouts
	515	*/
	516	#define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
	517	#define START_STOP_TIMEOUT (60 * HZ)
	518	#define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
	519	#define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
	520	#define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
	521
1da177e4 LT	522
	523	#define IDENTIFY_BASE 0x80
	524	#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE \|\
	525	((can_disconnect) ? 0x40 : 0) \|\
	526	((lun) & 0x07))
	527
	528	/*
	529	* struct scsi_device::scsi_level values. For SCSI devices other than those
	530	* prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
	531	* where "resp" is a byte array of the response to an INQUIRY. The scsi_level
	532	* variable is visible to the user via sysfs.
	533	*/
	534
	535	#define SCSI_UNKNOWN 0
	536	#define SCSI_1 1
	537	#define SCSI_1_CCS 2
	538	#define SCSI_2 3
	539	#define SCSI_3 4 /* SPC */
	540	#define SCSI_SPC_2 5
	541	#define SCSI_SPC_3 6
	542
	543	/*
	544	* INQ PERIPHERAL QUALIFIERS
	545	*/
	546	#define SCSI_INQ_PQ_CON 0x00
	547	#define SCSI_INQ_PQ_NOT_CON 0x01
	548	#define SCSI_INQ_PQ_NOT_CAP 0x03
	549
	550
	551	/*
	552	* Here are some scsi specific ioctl commands which are sometimes useful.
	553	*
	554	* Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
	555	*/
	556
	557	/* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
	558	#define SCSI_IOCTL_GET_IDLUN 0x5382
	559
	560	/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
	561
	562	/* Used to obtain the host number of a device. */
	563	#define SCSI_IOCTL_PROBE_HOST 0x5385
	564
	565	/* Used to obtain the bus number for a device */
	566	#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
	567
	568	/* Used to obtain the PCI location of a device */
	569	#define SCSI_IOCTL_GET_PCI 0x5387
	570
2908d778	571	/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
4a531e8c	572	static inline __u32 scsi_to_u32(__u8 *ptr)
2908d778 JB	573	{
	574	return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
	575	}
	576
1da177e4	577	#endif /* _SCSI_SCSI_H */