linux/include/scsi/scsi_eh.h
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   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
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