1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Functions used by both the SCSI initiator code and the SCSI target code.
4 */
5
6 #ifndef _SCSI_COMMON_H_
7 #define _SCSI_COMMON_H_
8
9 #include <linux/types.h>
10 #include <scsi/scsi_proto.h>
11
12 static inline unsigned
scsi_varlen_cdb_length(const void * hdr)13 scsi_varlen_cdb_length(const void *hdr)
14 {
15 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
16 }
17
18 extern const unsigned char scsi_command_size_tbl[8];
19 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
20
21 static inline unsigned
scsi_command_size(const unsigned char * cmnd)22 scsi_command_size(const unsigned char *cmnd)
23 {
24 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
25 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
26 }
27
28 /* Returns a human-readable name for the device */
29 extern const char *scsi_device_type(unsigned type);
30
31 extern void int_to_scsilun(u64, struct scsi_lun *);
32 extern u64 scsilun_to_int(struct scsi_lun *);
33
34 /*
35 * This is a slightly modified SCSI sense "descriptor" format header.
36 * The addition is to allow the 0x70 and 0x71 response codes. The idea
37 * is to place the salient data from either "fixed" or "descriptor" sense
38 * format into one structure to ease application processing.
39 *
40 * The original sense buffer should be kept around for those cases
41 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
42 */
43 struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
44 u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
45 u8 sense_key;
46 u8 asc;
47 u8 ascq;
48 u8 byte4;
49 u8 byte5;
50 u8 byte6;
51 u8 additional_length; /* always 0 for fixed sense format */
52 };
53
scsi_sense_valid(const struct scsi_sense_hdr * sshdr)54 static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
55 {
56 if (!sshdr)
57 return false;
58
59 return (sshdr->response_code & 0x70) == 0x70;
60 }
61
62 extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
63 struct scsi_sense_hdr *sshdr);
64
65 extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
66 int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
67 int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
68 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
69 int desc_type);
70
71 #endif /* _SCSI_COMMON_H_ */
72
