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 <uapi/linux/pr.h>
11 #include <scsi/scsi_proto.h>
12
13 enum scsi_pr_type {
14 SCSI_PR_WRITE_EXCLUSIVE = 0x01,
15 SCSI_PR_EXCLUSIVE_ACCESS = 0x03,
16 SCSI_PR_WRITE_EXCLUSIVE_REG_ONLY = 0x05,
17 SCSI_PR_EXCLUSIVE_ACCESS_REG_ONLY = 0x06,
18 SCSI_PR_WRITE_EXCLUSIVE_ALL_REGS = 0x07,
19 SCSI_PR_EXCLUSIVE_ACCESS_ALL_REGS = 0x08,
20 };
21
22 enum scsi_pr_type block_pr_type_to_scsi(enum pr_type type);
23 enum pr_type scsi_pr_type_to_block(enum scsi_pr_type type);
24
25 static inline unsigned
scsi_varlen_cdb_length(const void * hdr)26 scsi_varlen_cdb_length(const void *hdr)
27 {
28 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
29 }
30
31 extern const unsigned char scsi_command_size_tbl[8];
32 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
33
34 static inline unsigned
scsi_command_size(const unsigned char * cmnd)35 scsi_command_size(const unsigned char *cmnd)
36 {
37 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
38 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
39 }
40
41 static inline unsigned char
scsi_command_control(const unsigned char * cmnd)42 scsi_command_control(const unsigned char *cmnd)
43 {
44 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
45 cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1];
46 }
47
48 /* Returns a human-readable name for the device */
49 extern const char *scsi_device_type(unsigned type);
50
51 extern void int_to_scsilun(u64, struct scsi_lun *);
52 extern u64 scsilun_to_int(struct scsi_lun *);
53
54 /*
55 * This is a slightly modified SCSI sense "descriptor" format header.
56 * The addition is to allow the 0x70 and 0x71 response codes. The idea
57 * is to place the salient data from either "fixed" or "descriptor" sense
58 * format into one structure to ease application processing.
59 *
60 * The original sense buffer should be kept around for those cases
61 * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
62 */
63 struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
64 u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
65 u8 sense_key;
66 u8 asc;
67 u8 ascq;
68 u8 byte4;
69 u8 byte5;
70 u8 byte6;
71 u8 additional_length; /* always 0 for fixed sense format */
72 };
73
scsi_sense_valid(const struct scsi_sense_hdr * sshdr)74 static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
75 {
76 if (!sshdr)
77 return false;
78
79 return (sshdr->response_code & 0x70) == 0x70;
80 }
81
82 extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
83 struct scsi_sense_hdr *sshdr);
84
85 extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
86 int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
87 int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
88 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
89 int desc_type);
90
91 #endif /* _SCSI_COMMON_H_ */
92