include/scsi/scsi_eh.h

   1 #ifndef _SCSI_SCSI_EH_H
   2 #define _SCSI_SCSI_EH_H
   3
   4 #include <scsi/scsi_cmnd.h>
   5 struct scsi_device;
   6 struct Scsi_Host;
   7
   8 /*
   9  * This is a slightly modified SCSI sense "descriptor" format header.
  10  * The addition is to allow the 0x70 and 0x71 response codes. The idea
  11  * is to place the salient data from either "fixed" or "descriptor" sense
  12  * format into one structure to ease application processing.
  13  *
  14  * The original sense buffer should be kept around for those cases
  15  * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
  16  */
  17 struct scsi_sense_hdr {         /* See SPC-3 section 4.5 */
  18         u8 response_code;       /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
  19         u8 sense_key;
  20         u8 asc;
  21         u8 ascq;
  22         u8 byte4;
  23         u8 byte5;
  24         u8 byte6;
  25         u8 additional_length;   /* always 0 for fixed sense format */
  26 };
  27
  28 static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
  29 {
  30         if (!sshdr)
  31                 return 0;
  32
  33         return (sshdr->response_code & 0x70) == 0x70;
  34 }
  35
  36
  37 extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
  38                                struct list_head *done_q);
  39 extern void scsi_eh_flush_done_q(struct list_head *done_q);
  40 extern void scsi_report_bus_reset(struct Scsi_Host *, int);
  41 extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
  42 extern int scsi_block_when_processing_errors(struct scsi_device *);
  43 extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
  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 struct scsi_eh_save {
  69         int result;
  70         enum dma_data_direction data_direction;
  71         unsigned char cmd_len;
  72         unsigned char cmnd[MAX_COMMAND_SIZE];
  73
  74         void *buffer;
  75         unsigned bufflen;
  76         unsigned short use_sg;
  77         int resid;
  78
  79         struct scatterlist sense_sgl;
  80 };
  81
  82 extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
  83                 struct scsi_eh_save *ses, unsigned char *cmnd,
  84                 int cmnd_size, unsigned sense_bytes);
  85
  86 extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
  87                 struct scsi_eh_save *ses);
  88
  89 #endif /* _SCSI_SCSI_EH_H */