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/* SPDX-License-Identifier: GPL-2.0 */
* Functions used by both the SCSI initiator code and the SCSI target code.
#ifndef _SCSI_COMMON_H_
#define _SCSI_COMMON_H_
#include <linux/types.h>
#include <scsi/scsi_proto.h>
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]);
/* Returns a human-readable name for the device */
extern const char *scsi_device_type(unsigned type);
extern void int_to_scsilun(u64, struct scsi_lun *);
extern u64 scsilun_to_int(struct scsi_lun *);
* This is a slightly modified SCSI sense "descriptor" format header.
* The addition is to allow the 0x70 and 0x71 response codes. The idea
* is to place the salient data from either "fixed" or "descriptor" sense
* format into one structure to ease application processing.
* The original sense buffer should be kept around for those cases
* in which more information is required (e.g. the LBA of a MEDIUM ERROR).
struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
u8 sense_key;
u8 asc;
u8 ascq;
u8 byte4;
u8 byte5;
u8 byte6;
u8 additional_length; /* always 0 for fixed sense format */
static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
if (!sshdr)
return false;
return (sshdr->response_code & 0x70) == 0x70;
extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
struct scsi_sense_hdr *sshdr);
extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
int desc_type);
#endif /* _SCSI_COMMON_H_ */