1#ifndef _SCSI_SCSI_EH_H 2#define _SCSI_SCSI_EH_H 3 4#include <linux/scatterlist.h> 5 6#include <scsi/scsi_cmnd.h> 7struct scsi_device; 8struct Scsi_Host; 9 10/* 11 * This is a slightly modified SCSI sense "descriptor" format header. 12 * The addition is to allow the 0x70 and 0x71 response codes. The idea 13 * is to place the salient data from either "fixed" or "descriptor" sense 14 * format into one structure to ease application processing. 15 * 16 * The original sense buffer should be kept around for those cases 17 * in which more information is required (e.g. the LBA of a MEDIUM ERROR). 18 */ 19struct scsi_sense_hdr { /* See SPC-3 section 4.5 */ 20 u8 response_code; /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */ 21 u8 sense_key; 22 u8 asc; 23 u8 ascq; 24 u8 byte4; 25 u8 byte5; 26 u8 byte6; 27 u8 additional_length; /* always 0 for fixed sense format */ 28}; 29 30static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr) 31{ 32 if (!sshdr) 33 return 0; 34 35 return (sshdr->response_code & 0x70) == 0x70; 36} 37 38 39extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, 40 struct list_head *done_q); 41extern void scsi_eh_flush_done_q(struct list_head *done_q); 42extern void scsi_report_bus_reset(struct Scsi_Host *, int); 43extern void scsi_report_device_reset(struct Scsi_Host *, int, int); 44extern int scsi_block_when_processing_errors(struct scsi_device *); 45extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, 46 struct scsi_sense_hdr *sshdr); 47extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd, 48 struct scsi_sense_hdr *sshdr); 49 50static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr) 51{ 52 return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1)); 53} 54 55extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, 56 int desc_type); 57 58extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, 59 u64 * info_out); 60 61extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq); 62 63/* 64 * Reset request from external source 65 */ 66#define SCSI_TRY_RESET_DEVICE 1 67#define SCSI_TRY_RESET_BUS 2 68#define SCSI_TRY_RESET_HOST 3 69#define SCSI_TRY_RESET_TARGET 4 70 71extern int scsi_reset_provider(struct scsi_device *, int); 72 73struct scsi_eh_save { 74 /* saved state */ 75 int result; 76 enum dma_data_direction data_direction; 77 unsigned underflow; 78 unsigned char cmd_len; 79 unsigned char prot_op; 80 unsigned char *cmnd; 81 struct scsi_data_buffer sdb; 82 struct request *next_rq; 83 /* new command support */ 84 unsigned char eh_cmnd[BLK_MAX_CDB]; 85 struct scatterlist sense_sgl; 86}; 87 88extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, 89 struct scsi_eh_save *ses, unsigned char *cmnd, 90 int cmnd_size, unsigned sense_bytes); 91 92extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, 93 struct scsi_eh_save *ses); 94 95#endif /* _SCSI_SCSI_EH_H */ 96