include/scsi/scsi_eh.h

   1 #ifndef _SCSI_SCSI_EH_H
   2 #define _SCSI_SCSI_EH_H
   3
   4 struct scsi_cmnd;
   5 struct scsi_device;
   6 struct scsi_request;
   7 struct Scsi_Host;
   8
   9 /*
  10  * This is a slightly modified SCSI sense "descriptor" format header.
  11  * The addition is to allow the 0x70 and 0x71 response codes. The idea
  12  * is to place the salient data from either "fixed" or "descriptor" sense
  13  * format into one structure to ease application processing.
  14  *
  15  * The original sense buffer should be kept around for those cases
  16  * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
  17  */
  18 struct scsi_sense_hdr {         /* See SPC-3 section 4.5 */
  19         u8 response_code;       /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
  20         u8 sense_key;
  21         u8 asc;
  22         u8 ascq;
  23         u8 byte4;
  24         u8 byte5;
  25         u8 byte6;
  26         u8 additional_length;   /* always 0 for fixed sense format */
  27 };
  28
  29 static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
  30 {
  31         if (!sshdr)
  32                 return 0;
  33
  34         return (sshdr->response_code & 0x70) == 0x70;
  35 }
  36
  37
  38 extern void scsi_report_bus_reset(struct Scsi_Host *, int);
  39 extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
  40 extern int scsi_block_when_processing_errors(struct scsi_device *);
  41 extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
  42                 struct scsi_sense_hdr *sshdr);
  43 extern int scsi_request_normalize_sense(struct scsi_request *sreq,
  44                 struct scsi_sense_hdr *sshdr);
  45 extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
  46                 struct scsi_sense_hdr *sshdr);
  47
  48 static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr)
  49 {
  50         return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
  51 }
  52
  53 extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
  54                                        int desc_type);
  55
  56 extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
  57                                    u64 * info_out);
  58
  59 /*
  60  * Reset request from external source
  61  */
  62 #define SCSI_TRY_RESET_DEVICE   1
  63 #define SCSI_TRY_RESET_BUS      2
  64 #define SCSI_TRY_RESET_HOST     3
  65
  66 extern int scsi_reset_provider(struct scsi_device *, int);
  67
  68 #endif /* _SCSI_SCSI_EH_H */