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07e3842055
Move the functions that are used by both the initiator and target subsystems into scsi_common.c/.h. This change will allow to remove the initiator SCSI header include directives from most SCSI target source files in a later patch. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
310 lines
9.5 KiB
C
310 lines
9.5 KiB
C
/*
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* This header file contains public constants and structures used by
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* the SCSI initiator code.
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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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#include <linux/scatterlist.h>
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#include <linux/kernel.h>
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#include <scsi/scsi_common.h>
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#include <scsi/scsi_proto.h>
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struct scsi_cmnd;
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enum scsi_timeouts {
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SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
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};
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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 CONFIG_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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* DIX-capable adapters effectively support infinite chaining for the
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* protection information scatterlist
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*/
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#define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
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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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#ifdef CONFIG_ACPI
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struct acpi_bus_type;
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extern int
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scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
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extern void
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scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
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#endif
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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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* 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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* 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(u64 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 DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
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* other paths */
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#define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
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* paths might yield different results */
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#define DID_ALLOC_FAILURE 0x12 /* Space allocation on the device failed */
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#define DID_MEDIUM_ERROR 0x13 /* Medium error */
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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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#define FAST_IO_FAIL 0x2009
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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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