1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Functions used by both the SCSI initiator code and the SCSI target code.
6 #ifndef _SCSI_COMMON_H_
7 #define _SCSI_COMMON_H_
9 #include <linux/types.h>
10 #include <scsi/scsi_proto.h>
12 static inline unsigned
13 scsi_varlen_cdb_length(const void *hdr)
15 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
18 extern const unsigned char scsi_command_size_tbl[8];
19 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
21 static inline unsigned
22 scsi_command_size(const unsigned char *cmnd)
24 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
25 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
28 static inline unsigned char
29 scsi_command_control(const unsigned char *cmnd)
31 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
32 cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1];
35 /* Returns a human-readable name for the device */
36 extern const char *scsi_device_type(unsigned type);
38 extern void int_to_scsilun(u64, struct scsi_lun *);
39 extern u64 scsilun_to_int(struct scsi_lun *);
42 * This is a slightly modified SCSI sense "descriptor" format header.
43 * The addition is to allow the 0x70 and 0x71 response codes. The idea
44 * is to place the salient data from either "fixed" or "descriptor" sense
45 * format into one structure to ease application processing.
47 * The original sense buffer should be kept around for those cases
48 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
50 struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
51 u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
58 u8 additional_length; /* always 0 for fixed sense format */
61 static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
66 return (sshdr->response_code & 0x70) == 0x70;
69 extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
70 struct scsi_sense_hdr *sshdr);
72 extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
73 int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
74 int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
75 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
78 #endif /* _SCSI_COMMON_H_ */