drivers/scsi/scsi_obsolete.h

   1 /*
   2  *  scsi_obsolete.h Copyright (C) 1997 Eric Youngdale
   3  *
   4  */
   5
   6 #ifndef _SCSI_OBSOLETE_H
   7 #define _SCSI_OBSOLETE_H
   8
   9 /*
  10  * These are the return codes for the abort and reset functions.  The mid-level
  11  * code uses these to decide what to do next.  Each of the low level abort
  12  * and reset functions must correctly indicate what it has done.
  13  * The descriptions are written from the point of view of the mid-level code,
  14  * so that the return code is telling the mid-level drivers exactly what
  15  * the low level driver has already done, and what remains to be done.
  16  */
  17
  18 /* We did not do anything.
  19  * Wait some more for this command to complete, and if this does not work,
  20  * try something more serious. */
  21 #define SCSI_ABORT_SNOOZE 0
  22
  23 /* This means that we were able to abort the command.  We have already
  24  * called the mid-level done function, and do not expect an interrupt that
  25  * will lead to another call to the mid-level done function for this command */
  26 #define SCSI_ABORT_SUCCESS 1
  27
  28 /* We called for an abort of this command, and we should get an interrupt
  29  * when this succeeds.  Thus we should not restore the timer for this
  30  * command in the mid-level abort function. */
  31 #define SCSI_ABORT_PENDING 2
  32
  33 /* Unable to abort - command is currently on the bus.  Grin and bear it. */
  34 #define SCSI_ABORT_BUSY 3
  35
  36 /* The command is not active in the low level code. Command probably
  37  * finished. */
  38 #define SCSI_ABORT_NOT_RUNNING 4
  39
  40 /* Something went wrong.  The low level driver will indicate the correct
  41  * error condition when it calls scsi_done, so the mid-level abort function
  42  * can simply wait until this comes through */
  43 #define SCSI_ABORT_ERROR 5
  44
  45 /* We do not know how to reset the bus, or we do not want to.  Bummer.
  46  * Anyway, just wait a little more for the command in question, and hope that
  47  * it eventually finishes.  If it never finishes, the SCSI device could
  48  * hang, so use this with caution. */
  49 #define SCSI_RESET_SNOOZE 0
  50
  51 /* We do not know how to reset the bus, or we do not want to.  Bummer.
  52  * We have given up on this ever completing.  The mid-level code will
  53  * request sense information to decide how to proceed from here. */
  54 #define SCSI_RESET_PUNT 1
  55
  56 /* This means that we were able to reset the bus.  We have restarted all of
  57  * the commands that should be restarted, and we should be able to continue
  58  * on normally from here.  We do not expect any interrupts that will return
  59  * DID_RESET to any of the other commands in the host_queue, and the mid-level
  60  * code does not need to do anything special to keep the commands alive.
  61  * If a hard reset was performed then all outstanding commands on the
  62  * bus have been restarted. */
  63 #define SCSI_RESET_SUCCESS 2
  64
  65 /* We called for a reset of this bus, and we should get an interrupt
  66  * when this succeeds.  Each command should get its own status
  67  * passed up to scsi_done, but this has not happened yet.
  68  * If a hard reset was performed, then we expect an interrupt
  69  * for *each* of the outstanding commands that will have the
  70  * effect of restarting the commands.
  71  */
  72 #define SCSI_RESET_PENDING 3
  73
  74 /* We did a reset, but do not expect an interrupt to signal DID_RESET.
  75  * This tells the upper level code to request the sense info, and this
  76  * should keep the command alive. */
  77 #define SCSI_RESET_WAKEUP 4
  78
  79 /* The command is not active in the low level code. Command probably
  80    finished. */
  81 #define SCSI_RESET_NOT_RUNNING 5
  82
  83 /* Something went wrong, and we do not know how to fix it. */
  84 #define SCSI_RESET_ERROR 6
  85
  86 #define SCSI_RESET_SYNCHRONOUS          0x01
  87 #define SCSI_RESET_ASYNCHRONOUS         0x02
  88 #define SCSI_RESET_SUGGEST_BUS_RESET    0x04
  89 #define SCSI_RESET_SUGGEST_HOST_RESET   0x08
  90 /*
  91  * This is a bitmask that is ored with one of the above codes.
  92  * It tells the mid-level code that we did a hard reset.
  93  */
  94 #define SCSI_RESET_BUS_RESET 0x100
  95 /*
  96  * This is a bitmask that is ored with one of the above codes.
  97  * It tells the mid-level code that we did a host adapter reset.
  98  */
  99 #define SCSI_RESET_HOST_RESET 0x200
 100 /*
 101  * Used to mask off bits and to obtain the basic action that was
 102  * performed.
 103  */
 104 #define SCSI_RESET_ACTION   0xff
 105
 106 #endif                          /* SCSI_OBSOLETE_H */