79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Functions used by both the SCSI initiator code and the SCSI target code.
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*/
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#ifndef _SCSI_COMMON_H_
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#define _SCSI_COMMON_H_
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#include <linux/types.h>
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#include <scsi/scsi_proto.h>
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static inline unsigned
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scsi_varlen_cdb_length(const void *hdr)
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{
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return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
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}
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extern const unsigned char scsi_command_size_tbl[8];
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#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
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static inline unsigned
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scsi_command_size(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
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}
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static inline unsigned char
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scsi_command_control(const unsigned char *cmnd)
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{
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return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
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cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1];
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}
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/* Returns a human-readable name for the device */
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extern const char *scsi_device_type(unsigned type);
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extern void int_to_scsilun(u64, struct scsi_lun *);
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extern u64 scsilun_to_int(struct scsi_lun *);
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/*
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* This is a slightly modified SCSI sense "descriptor" format header.
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* The addition is to allow the 0x70 and 0x71 response codes. The idea
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* is to place the salient data from either "fixed" or "descriptor" sense
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* format into one structure to ease application processing.
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*
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* The original sense buffer should be kept around for those cases
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* in which more information is required (e.g. the LBA of a MEDIUM ERROR).
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*/
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struct scsi_sense_hdr { /* See SPC-3 section 4.5 */
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u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
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u8 sense_key;
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u8 asc;
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u8 ascq;
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u8 byte4;
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u8 byte5;
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u8 byte6;
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u8 additional_length; /* always 0 for fixed sense format */
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};
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static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
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{
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if (!sshdr)
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return false;
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return (sshdr->response_code & 0x70) == 0x70;
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}
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extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
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struct scsi_sense_hdr *sshdr);
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extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
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int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
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int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
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extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
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int desc_type);
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#endif /* _SCSI_COMMON_H_ */
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