cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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scsi_common.h (2329B)

      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
     12static inline unsigned
     13scsi_varlen_cdb_length(const void *hdr)
     14{
     15	return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
     16}
     17
     18extern const unsigned char scsi_command_size_tbl[8];
     19#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
     20
     21static inline unsigned
     22scsi_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
     28static inline unsigned char
     29scsi_command_control(const unsigned char *cmnd)
     30{
     31	return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
     32		cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1];
     33}
     34
     35/* Returns a human-readable name for the device */
     36extern const char *scsi_device_type(unsigned type);
     37
     38extern void int_to_scsilun(u64, struct scsi_lun *);
     39extern u64 scsilun_to_int(struct scsi_lun *);
     40
     41/*
     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.
     46 *
     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).
     49 */
     50struct scsi_sense_hdr {		/* See SPC-3 section 4.5 */
     51	u8 response_code;	/* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
     52	u8 sense_key;
     53	u8 asc;
     54	u8 ascq;
     55	u8 byte4;
     56	u8 byte5;
     57	u8 byte6;
     58	u8 additional_length;	/* always 0 for fixed sense format */
     59};
     60
     61static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
     62{
     63	if (!sshdr)
     64		return false;
     65
     66	return (sshdr->response_code & 0x70) == 0x70;
     67}
     68
     69extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
     70				 struct scsi_sense_hdr *sshdr);
     71
     72extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
     73int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
     74int scsi_set_sense_field_pointer(u8 *buf, int buf_len, u16 fp, u8 bp, bool cd);
     75extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
     76				       int desc_type);
     77
     78#endif /* _SCSI_COMMON_H_ */