/* SPDX-License-Identifier: GPL-2.0 */ /* * This header file contains public constants and structures used by * the SCSI initiator code.
*/ #ifndef _SCSI_SCSI_H #define _SCSI_SCSI_H
/* * 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
/* * 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;
};
/* * 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)
/** * scsi_status_is_check_condition - check the status return. * * @status: the status passed up from the driver (including host and * driver components) * * Returns: %true if the status code is SAM_STAT_CHECK_CONDITION.
*/ staticinlineint scsi_status_is_check_condition(int status)
{ if (status < 0) returnfalse;
status &= 0xfe; return status == SAM_STAT_CHECK_CONDITION;
}
/* * Use these to separate status msg and our bytes * * These are set by: * * status byte = set from target device * msg_byte (unused) * host_byte = set by low-level driver to indicate status.
*/ #define status_byte(result) (result & 0xff) #define host_byte(result) (((result) >> 16) & 0xff)
/* * 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.
*/
/* * 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
/** * scsi_status_is_good - check the status return. * * @status: the status passed up from the driver (including host and * driver components) * * Returns: %true for known good conditions that may be treated as * command completed normally
*/ staticinlinebool scsi_status_is_good(int status)
{ if (status < 0) returnfalse;
if (host_byte(status) == DID_NO_CONNECT) returnfalse;
/* * 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_CONDITION_MET) || /* Next two "intermediate" statuses are obsolete in SAM-4 */
(status == SAM_STAT_INTERMEDIATE) ||
(status == SAM_STAT_INTERMEDIATE_CONDITION_MET) || /* FIXME: this is obsolete in SAM-3 */
(status == SAM_STAT_COMMAND_TERMINATED));
}
#endif/* _SCSI_SCSI_H */
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