ncr5380: Implement new eh_abort_handler
Introduce a new eh_abort_handler implementation. This one attempts to follow all of the rules relating to EH handlers. There is still a known bug: during selection, a command becomes invisible to the EH handlers because it only appears in a pointer on the stack of a different thread. This bug is addressed in a subsequent patch. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Ondrej Zary <linux@rainbow-software.org> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain
Martin K. Petersen
Родитель
f27db8eb98
Коммит
8b00c3d5d4
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@ -2269,23 +2269,65 @@ static void NCR5380_dma_complete(NCR5380_instance * instance) {
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}
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#endif /* def REAL_DMA */
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/*
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* Function : int NCR5380_abort (struct scsi_cmnd *cmd)
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/**
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* list_find_cmd - test for presence of a command in a linked list
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* @haystack: list of commands
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* @needle: command to search for
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*/
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static bool list_find_cmd(struct list_head *haystack,
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struct scsi_cmnd *needle)
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{
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struct NCR5380_cmd *ncmd;
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list_for_each_entry(ncmd, haystack, list)
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if (NCR5380_to_scmd(ncmd) == needle)
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return true;
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return false;
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}
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/**
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* list_remove_cmd - remove a command from linked list
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* @haystack: list of commands
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* @needle: command to remove
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*/
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static bool list_del_cmd(struct list_head *haystack,
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struct scsi_cmnd *needle)
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{
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if (list_find_cmd(haystack, needle)) {
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struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle);
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list_del(&ncmd->list);
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return true;
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}
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return false;
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}
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/**
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* NCR5380_abort - scsi host eh_abort_handler() method
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* @cmd: the command to be aborted
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*
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* Purpose : abort a command
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* Try to abort a given command by removing it from queues and/or sending
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* the target an abort message. This may not succeed in causing a target
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* to abort the command. Nonetheless, the low-level driver must forget about
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* the command because the mid-layer reclaims it and it may be re-issued.
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*
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* Inputs : cmd - the scsi_cmnd to abort, code - code to set the
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* host byte of the result field to, if zero DID_ABORTED is
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* used.
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* The normal path taken by a command is as follows. For EH we trace this
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* same path to locate and abort the command.
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*
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* Returns : SUCCESS - success, FAILED on failure.
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* unissued -> selecting -> [unissued -> selecting ->]... connected ->
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* [disconnected -> connected ->]...
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* [autosense -> connected ->] done
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*
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* XXX - there is no way to abort the command that is currently
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* connected, you have to wait for it to complete. If this is
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* a problem, we could implement longjmp() / setjmp(), setjmp()
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* called where the loop started in NCR5380_main().
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*
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* Locks: host lock taken by caller
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* If cmd is unissued then just remove it.
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* If cmd is disconnected, try to select the target.
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* If cmd is connected, try to send an abort message.
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* If cmd is waiting for autosense, give it a chance to complete but check
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* that it isn't left connected.
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* If cmd was not found at all then presumably it has already been completed,
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* in which case return SUCCESS to try to avoid further EH measures.
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* If the command has not completed yet, we must not fail to find it.
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*/
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static int NCR5380_abort(struct scsi_cmnd *cmd)
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@ -2293,18 +2335,101 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
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struct Scsi_Host *instance = cmd->device->host;
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struct NCR5380_hostdata *hostdata = shost_priv(instance);
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unsigned long flags;
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int result = SUCCESS;
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spin_lock_irqsave(&hostdata->lock, flags);
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#if (NDEBUG & NDEBUG_ANY)
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scmd_printk(KERN_INFO, cmd, "aborting command\n");
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scmd_printk(KERN_INFO, cmd, __func__);
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#endif
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NCR5380_dprint(NDEBUG_ANY, instance);
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NCR5380_dprint_phase(NDEBUG_ANY, instance);
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if (list_del_cmd(&hostdata->unissued, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from issue queue\n", cmd);
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cmd->result = DID_ABORT << 16;
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cmd->scsi_done(cmd); /* No tag or busy flag to worry about */
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}
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if (list_del_cmd(&hostdata->disconnected, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from disconnected list\n", cmd);
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cmd->result = DID_ERROR << 16;
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if (!hostdata->connected)
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NCR5380_select(instance, cmd);
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if (hostdata->connected != cmd) {
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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}
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if (hostdata->connected == cmd) {
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dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
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hostdata->connected = NULL;
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if (do_abort(instance)) {
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set_host_byte(cmd, DID_ERROR);
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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set_host_byte(cmd, DID_ABORT);
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#ifdef REAL_DMA
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hostdata->dma_len = 0;
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#endif
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if (cmd->cmnd[0] == REQUEST_SENSE)
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complete_cmd(instance, cmd);
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else {
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struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
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/* Perform autosense for this command */
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list_add(&ncmd->list, &hostdata->autosense);
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}
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}
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if (list_find_cmd(&hostdata->autosense, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: found %p on sense queue\n", cmd);
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spin_unlock_irqrestore(&hostdata->lock, flags);
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queue_work(hostdata->work_q, &hostdata->main_task);
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msleep(1000);
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spin_lock_irqsave(&hostdata->lock, flags);
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if (list_del_cmd(&hostdata->autosense, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from sense queue\n", cmd);
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set_host_byte(cmd, DID_ABORT);
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complete_cmd(instance, cmd);
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goto out;
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}
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}
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if (hostdata->connected == cmd) {
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dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
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hostdata->connected = NULL;
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if (do_abort(instance)) {
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set_host_byte(cmd, DID_ERROR);
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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set_host_byte(cmd, DID_ABORT);
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#ifdef REAL_DMA
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hostdata->dma_len = 0;
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#endif
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complete_cmd(instance, cmd);
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}
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out:
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if (result == FAILED)
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dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd);
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else
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dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd);
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queue_work(hostdata->work_q, &hostdata->main_task);
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spin_unlock_irqrestore(&hostdata->lock, flags);
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return FAILED;
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return result;
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}
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@ -2480,41 +2480,168 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
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}
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/*
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* Function : int NCR5380_abort (struct scsi_cmnd *cmd)
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*
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* Purpose : abort a command
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*
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* Inputs : cmd - the scsi_cmnd to abort, code - code to set the
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* host byte of the result field to, if zero DID_ABORTED is
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* used.
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*
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* Returns : SUCCESS - success, FAILED on failure.
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*
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* XXX - there is no way to abort the command that is currently
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* connected, you have to wait for it to complete. If this is
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* a problem, we could implement longjmp() / setjmp(), setjmp()
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* called where the loop started in NCR5380_main().
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/**
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* list_find_cmd - test for presence of a command in a linked list
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* @haystack: list of commands
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* @needle: command to search for
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*/
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static
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int NCR5380_abort(struct scsi_cmnd *cmd)
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static bool list_find_cmd(struct list_head *haystack,
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struct scsi_cmnd *needle)
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{
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struct NCR5380_cmd *ncmd;
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list_for_each_entry(ncmd, haystack, list)
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if (NCR5380_to_scmd(ncmd) == needle)
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return true;
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return false;
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}
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/**
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* list_remove_cmd - remove a command from linked list
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* @haystack: list of commands
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* @needle: command to remove
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*/
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static bool list_del_cmd(struct list_head *haystack,
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struct scsi_cmnd *needle)
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{
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if (list_find_cmd(haystack, needle)) {
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struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle);
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list_del(&ncmd->list);
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return true;
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}
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return false;
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}
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/**
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* NCR5380_abort - scsi host eh_abort_handler() method
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* @cmd: the command to be aborted
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*
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* Try to abort a given command by removing it from queues and/or sending
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* the target an abort message. This may not succeed in causing a target
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* to abort the command. Nonetheless, the low-level driver must forget about
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* the command because the mid-layer reclaims it and it may be re-issued.
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*
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* The normal path taken by a command is as follows. For EH we trace this
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* same path to locate and abort the command.
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*
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* unissued -> selecting -> [unissued -> selecting ->]... connected ->
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* [disconnected -> connected ->]...
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* [autosense -> connected ->] done
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*
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* If cmd is unissued then just remove it.
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* If cmd is disconnected, try to select the target.
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* If cmd is connected, try to send an abort message.
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* If cmd is waiting for autosense, give it a chance to complete but check
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* that it isn't left connected.
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* If cmd was not found at all then presumably it has already been completed,
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* in which case return SUCCESS to try to avoid further EH measures.
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* If the command has not completed yet, we must not fail to find it.
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*/
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static int NCR5380_abort(struct scsi_cmnd *cmd)
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{
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struct Scsi_Host *instance = cmd->device->host;
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struct NCR5380_hostdata *hostdata = shost_priv(instance);
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unsigned long flags;
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int result = SUCCESS;
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spin_lock_irqsave(&hostdata->lock, flags);
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#if (NDEBUG & NDEBUG_ANY)
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scmd_printk(KERN_INFO, cmd, "aborting command\n");
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scmd_printk(KERN_INFO, cmd, __func__);
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#endif
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NCR5380_dprint(NDEBUG_ANY, instance);
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NCR5380_dprint_phase(NDEBUG_ANY, instance);
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if (list_del_cmd(&hostdata->unissued, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from issue queue\n", cmd);
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cmd->result = DID_ABORT << 16;
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cmd->scsi_done(cmd); /* No tag or busy flag to worry about */
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}
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if (list_del_cmd(&hostdata->disconnected, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from disconnected list\n", cmd);
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cmd->result = DID_ERROR << 16;
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if (!hostdata->connected)
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NCR5380_select(instance, cmd);
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if (hostdata->connected != cmd) {
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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}
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if (hostdata->connected == cmd) {
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dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
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hostdata->connected = NULL;
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if (do_abort(instance)) {
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set_host_byte(cmd, DID_ERROR);
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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set_host_byte(cmd, DID_ABORT);
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#ifdef REAL_DMA
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hostdata->dma_len = 0;
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#endif
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if (cmd->cmnd[0] == REQUEST_SENSE)
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complete_cmd(instance, cmd);
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else {
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struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
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/* Perform autosense for this command */
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list_add(&ncmd->list, &hostdata->autosense);
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}
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}
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if (list_find_cmd(&hostdata->autosense, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: found %p on sense queue\n", cmd);
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spin_unlock_irqrestore(&hostdata->lock, flags);
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queue_work(hostdata->work_q, &hostdata->main_task);
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msleep(1000);
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spin_lock_irqsave(&hostdata->lock, flags);
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if (list_del_cmd(&hostdata->autosense, cmd)) {
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dsprintk(NDEBUG_ABORT, instance,
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"abort: removed %p from sense queue\n", cmd);
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set_host_byte(cmd, DID_ABORT);
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complete_cmd(instance, cmd);
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goto out;
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}
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}
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if (hostdata->connected == cmd) {
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dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
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hostdata->connected = NULL;
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if (do_abort(instance)) {
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set_host_byte(cmd, DID_ERROR);
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complete_cmd(instance, cmd);
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result = FAILED;
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goto out;
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}
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set_host_byte(cmd, DID_ABORT);
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#ifdef REAL_DMA
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hostdata->dma_len = 0;
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#endif
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complete_cmd(instance, cmd);
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}
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out:
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if (result == FAILED)
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dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd);
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else
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dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd);
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queue_work(hostdata->work_q, &hostdata->main_task);
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maybe_release_dma_irq(instance);
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spin_unlock_irqrestore(&hostdata->lock, flags);
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return FAILED;
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return result;
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}
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