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Diffstat (limited to 'drivers/scsi/scsi_obsolete.h')
| -rw-r--r-- | drivers/scsi/scsi_obsolete.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_obsolete.h b/drivers/scsi/scsi_obsolete.h new file mode 100644 index 000000000000..abeacb996ea0 --- /dev/null +++ b/drivers/scsi/scsi_obsolete.h @@ -0,0 +1,106 @@ +/* + * scsi_obsolete.h Copyright (C) 1997 Eric Youngdale + * + */ + +#ifndef _SCSI_OBSOLETE_H +#define _SCSI_OBSOLETE_H + +/* + * These are the return codes for the abort and reset functions. The mid-level + * code uses these to decide what to do next. Each of the low level abort + * and reset functions must correctly indicate what it has done. + * The descriptions are written from the point of view of the mid-level code, + * so that the return code is telling the mid-level drivers exactly what + * the low level driver has already done, and what remains to be done. + */ + +/* We did not do anything. + * Wait some more for this command to complete, and if this does not work, + * try something more serious. */ +#define SCSI_ABORT_SNOOZE 0 + +/* This means that we were able to abort the command. We have already + * called the mid-level done function, and do not expect an interrupt that + * will lead to another call to the mid-level done function for this command */ +#define SCSI_ABORT_SUCCESS 1 + +/* We called for an abort of this command, and we should get an interrupt + * when this succeeds. Thus we should not restore the timer for this + * command in the mid-level abort function. */ +#define SCSI_ABORT_PENDING 2 + +/* Unable to abort - command is currently on the bus. Grin and bear it. */ +#define SCSI_ABORT_BUSY 3 + +/* The command is not active in the low level code. Command probably + * finished. */ +#define SCSI_ABORT_NOT_RUNNING 4 + +/* Something went wrong. The low level driver will indicate the correct + * error condition when it calls scsi_done, so the mid-level abort function + * can simply wait until this comes through */ +#define SCSI_ABORT_ERROR 5 + +/* We do not know how to reset the bus, or we do not want to. Bummer. + * Anyway, just wait a little more for the command in question, and hope that + * it eventually finishes. If it never finishes, the SCSI device could + * hang, so use this with caution. */ +#define SCSI_RESET_SNOOZE 0 + +/* We do not know how to reset the bus, or we do not want to. Bummer. + * We have given up on this ever completing. The mid-level code will + * request sense information to decide how to proceed from here. */ +#define SCSI_RESET_PUNT 1 + +/* This means that we were able to reset the bus. We have restarted all of + * the commands that should be restarted, and we should be able to continue + * on normally from here. We do not expect any interrupts that will return + * DID_RESET to any of the other commands in the host_queue, and the mid-level + * code does not need to do anything special to keep the commands alive. + * If a hard reset was performed then all outstanding commands on the + * bus have been restarted. */ +#define SCSI_RESET_SUCCESS 2 + +/* We called for a reset of this bus, and we should get an interrupt + * when this succeeds. Each command should get its own status + * passed up to scsi_done, but this has not happened yet. + * If a hard reset was performed, then we expect an interrupt + * for *each* of the outstanding commands that will have the + * effect of restarting the commands. + */ +#define SCSI_RESET_PENDING 3 + +/* We did a reset, but do not expect an interrupt to signal DID_RESET. + * This tells the upper level code to request the sense info, and this + * should keep the command alive. */ +#define SCSI_RESET_WAKEUP 4 + +/* The command is not active in the low level code. Command probably + finished. */ +#define SCSI_RESET_NOT_RUNNING 5 + +/* Something went wrong, and we do not know how to fix it. */ +#define SCSI_RESET_ERROR 6 + +#define SCSI_RESET_SYNCHRONOUS 0x01 +#define SCSI_RESET_ASYNCHRONOUS 0x02 +#define SCSI_RESET_SUGGEST_BUS_RESET 0x04 +#define SCSI_RESET_SUGGEST_HOST_RESET 0x08 +/* + * This is a bitmask that is ored with one of the above codes. + * It tells the mid-level code that we did a hard reset. + */ +#define SCSI_RESET_BUS_RESET 0x100 +/* + * This is a bitmask that is ored with one of the above codes. + * It tells the mid-level code that we did a host adapter reset. + */ +#define SCSI_RESET_HOST_RESET 0x200 +/* + * Used to mask off bits and to obtain the basic action that was + * performed. + */ +#define SCSI_RESET_ACTION 0xff + +#endif /* SCSI_OBSOLETE_H */ |