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