221 lines
5.8 KiB
C
221 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#include <scsi/scsi_status.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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* 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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/*
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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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* scsi_status_is_check_condition - 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 if the status code is SAM_STAT_CHECK_CONDITION.
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*/
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static inline int scsi_status_is_check_condition(int status)
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{
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if (status < 0)
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return false;
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status &= 0xfe;
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return status == SAM_STAT_CHECK_CONDITION;
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}
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/*
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* Extended message codes.
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*/
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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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/*
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* Internal return values.
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*/
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enum scsi_disposition {
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NEEDS_RETRY = 0x2001,
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SUCCESS = 0x2002,
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FAILED = 0x2003,
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QUEUED = 0x2004,
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SOFT_ERROR = 0x2005,
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ADD_TO_MLQUEUE = 0x2006,
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TIMEOUT_ERROR = 0x2007,
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SCSI_RETURN_NOT_HANDLED = 0x2008,
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FAST_IO_FAIL = 0x2009,
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};
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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 (unused)
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* host_byte = set by low-level driver to indicate status.
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*/
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#define status_byte(result) (result & 0xff)
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#define host_byte(result) (((result) >> 16) & 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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/** 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 bool scsi_status_is_good(int status)
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{
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if (status < 0)
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return false;
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if (host_byte(status) == DID_NO_CONNECT)
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return false;
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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_CONDITION_MET) ||
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/* Next two "intermediate" statuses are obsolete in SAM-4 */
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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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#endif /* _SCSI_SCSI_H */
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