mptscsih.c

linux 内核源代码

	if (hd->resetPending) {
		dtmprintk(ioc, printk(MYIOC_s_WARN_FMT "qcmd: SCpnt=%p timeout + 60HZ\n",
			ioc->name, SCpnt));
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	/*
	 *  Put together a MPT SCSI request...
	 */
	if ((mf = mpt_get_msg_frame(ioc->DoneCtx, ioc)) == NULL) {
		dprintk(ioc, printk(MYIOC_s_WARN_FMT "QueueCmd, no msg frames!!\n",
				ioc->name));
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	pScsiReq = (SCSIIORequest_t *) mf;

	my_idx = le16_to_cpu(mf->u.frame.hwhdr.msgctxu.fld.req_idx);

	ADD_INDEX_LOG(my_idx);

	/*    TUR's being issued with scsictl=0x02000000 (DATA_IN)!
	 *    Seems we may receive a buffer (datalen>0) even when there
	 *    will be no data transfer!  GRRRRR...
	 */
	if (SCpnt->sc_data_direction == DMA_FROM_DEVICE) {
		datalen = scsi_bufflen(SCpnt);
		scsidir = MPI_SCSIIO_CONTROL_READ;	/* DATA IN  (host<--ioc<--dev) */
	} else if (SCpnt->sc_data_direction == DMA_TO_DEVICE) {
		datalen = scsi_bufflen(SCpnt);
		scsidir = MPI_SCSIIO_CONTROL_WRITE;	/* DATA OUT (host-->ioc-->dev) */
	} else {
		datalen = 0;
		scsidir = MPI_SCSIIO_CONTROL_NODATATRANSFER;
	}

	/* Default to untagged. Once a target structure has been allocated,
	 * use the Inquiry data to determine if device supports tagged.
	 */
	if (vdevice
	    && (vdevice->vtarget->tflags & MPT_TARGET_FLAGS_Q_YES)
	    && (SCpnt->device->tagged_supported)) {
		scsictl = scsidir | MPI_SCSIIO_CONTROL_SIMPLEQ;
	} else {
		scsictl = scsidir | MPI_SCSIIO_CONTROL_UNTAGGED;
	}

	/* Use the above information to set up the message frame
	 */
	pScsiReq->TargetID = (u8) vdevice->vtarget->id;
	pScsiReq->Bus = vdevice->vtarget->channel;
	pScsiReq->ChainOffset = 0;
	if (vdevice->vtarget->tflags &  MPT_TARGET_FLAGS_RAID_COMPONENT)
		pScsiReq->Function = MPI_FUNCTION_RAID_SCSI_IO_PASSTHROUGH;
	else
		pScsiReq->Function = MPI_FUNCTION_SCSI_IO_REQUEST;
	pScsiReq->CDBLength = SCpnt->cmd_len;
	pScsiReq->SenseBufferLength = MPT_SENSE_BUFFER_SIZE;
	pScsiReq->Reserved = 0;
	pScsiReq->MsgFlags = mpt_msg_flags();
	int_to_scsilun(SCpnt->device->lun, (struct scsi_lun *)pScsiReq->LUN);
	pScsiReq->Control = cpu_to_le32(scsictl);

	/*
	 *  Write SCSI CDB into the message
	 */
	cmd_len = SCpnt->cmd_len;
	for (ii=0; ii < cmd_len; ii++)
		pScsiReq->CDB[ii] = SCpnt->cmnd[ii];

	for (ii=cmd_len; ii < 16; ii++)
		pScsiReq->CDB[ii] = 0;

	/* DataLength */
	pScsiReq->DataLength = cpu_to_le32(datalen);

	/* SenseBuffer low address */
	pScsiReq->SenseBufferLowAddr = cpu_to_le32(ioc->sense_buf_low_dma
					   + (my_idx * MPT_SENSE_BUFFER_ALLOC));

	/* Now add the SG list
	 * Always have a SGE even if null length.
	 */
	if (datalen == 0) {
		/* Add a NULL SGE */
		mptscsih_add_sge((char *)&pScsiReq->SGL, MPT_SGE_FLAGS_SSIMPLE_READ | 0,
			(dma_addr_t) -1);
	} else {
		/* Add a 32 or 64 bit SGE */
		if (mptscsih_AddSGE(ioc, SCpnt, pScsiReq, my_idx) != SUCCESS)
			goto fail;
	}

	SCpnt->host_scribble = (unsigned char *)mf;
	mptscsih_set_scsi_lookup(ioc, my_idx, SCpnt);

	mpt_put_msg_frame(ioc->DoneCtx, ioc, mf);
	dmfprintk(ioc, printk(MYIOC_s_DEBUG_FMT "Issued SCSI cmd (%p) mf=%p idx=%d\n",
			ioc->name, SCpnt, mf, my_idx));
	DBG_DUMP_REQUEST_FRAME(ioc, (u32 *)mf);
	return 0;

 fail:
	mptscsih_freeChainBuffers(ioc, my_idx);
	mpt_free_msg_frame(ioc, mf);
	return SCSI_MLQUEUE_HOST_BUSY;
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *	mptscsih_freeChainBuffers - Function to free chain buffers associated
 *	with a SCSI IO request
 *	@hd: Pointer to the MPT_SCSI_HOST instance
 *	@req_idx: Index of the SCSI IO request frame.
 *
 *	Called if SG chain buffer allocation fails and mptscsih callbacks.
 *	No return.
 */
static void
mptscsih_freeChainBuffers(MPT_ADAPTER *ioc, int req_idx)
{
	MPT_FRAME_HDR *chain;
	unsigned long flags;
	int chain_idx;
	int next;

	/* Get the first chain index and reset
	 * tracker state.
	 */
	chain_idx = ioc->ReqToChain[req_idx];
	ioc->ReqToChain[req_idx] = MPT_HOST_NO_CHAIN;

	while (chain_idx != MPT_HOST_NO_CHAIN) {

		/* Save the next chain buffer index */
		next = ioc->ChainToChain[chain_idx];

		/* Free this chain buffer and reset
		 * tracker
		 */
		ioc->ChainToChain[chain_idx] = MPT_HOST_NO_CHAIN;

		chain = (MPT_FRAME_HDR *) (ioc->ChainBuffer
					+ (chain_idx * ioc->req_sz));

		spin_lock_irqsave(&ioc->FreeQlock, flags);
		list_add_tail(&chain->u.frame.linkage.list, &ioc->FreeChainQ);
		spin_unlock_irqrestore(&ioc->FreeQlock, flags);

		dmfprintk(ioc, printk(MYIOC_s_DEBUG_FMT "FreeChainBuffers (index %d)\n",
				ioc->name, chain_idx));

		/* handle next */
		chain_idx = next;
	}
	return;
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *	Reset Handling
 */

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/**
 *	mptscsih_TMHandler - Generic handler for SCSI Task Management.
 *	@hd: Pointer to MPT SCSI HOST structure
 *	@type: Task Management type
 *	@channel: channel number for task management
 *	@id: Logical Target ID for reset (if appropriate)
 *	@lun: Logical Unit for reset (if appropriate)
 *	@ctx2abort: Context for the task to be aborted (if appropriate)
 *	@timeout: timeout for task management control
 *
 *	Fall through to mpt_HardResetHandler if: not operational, too many
 *	failed TM requests or handshake failure.
 *
 *	Remark: Currently invoked from a non-interrupt thread (_bh).
 *
 *	Remark: With old EH code, at most 1 SCSI TaskMgmt function per IOC
 *	will be active.
 *
 *	Returns 0 for SUCCESS, or %FAILED.
 **/
int
mptscsih_TMHandler(MPT_SCSI_HOST *hd, u8 type, u8 channel, u8 id, int lun, int ctx2abort, ulong timeout)
{
	MPT_ADAPTER	*ioc;
	int		 rc = -1;
	u32		 ioc_raw_state;
	unsigned long	 flags;

	ioc = hd->ioc;
	dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "TMHandler Entered!\n", ioc->name));

	// SJR - CHECKME - Can we avoid this here?
	// (mpt_HardResetHandler has this check...)
	spin_lock_irqsave(&ioc->diagLock, flags);
	if ((ioc->diagPending) || (ioc->alt_ioc && ioc->alt_ioc->diagPending)) {
		spin_unlock_irqrestore(&ioc->diagLock, flags);
		return FAILED;
	}
	spin_unlock_irqrestore(&ioc->diagLock, flags);

	/*  Wait a fixed amount of time for the TM pending flag to be cleared.
	 *  If we time out and not bus reset, then we return a FAILED status
	 *  to the caller.
	 *  The call to mptscsih_tm_pending_wait() will set the pending flag
	 *  if we are
	 *  successful. Otherwise, reload the FW.
	 */
	if (mptscsih_tm_pending_wait(hd) == FAILED) {
		if (type == MPI_SCSITASKMGMT_TASKTYPE_ABORT_TASK) {
			dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "TMHandler abort: "
			   "Timed out waiting for last TM (%d) to complete! \n",
			   ioc->name, hd->tmPending));
			return FAILED;
		} else if (type == MPI_SCSITASKMGMT_TASKTYPE_TARGET_RESET) {
			dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "TMHandler target "
				"reset: Timed out waiting for last TM (%d) "
				"to complete! \n", ioc->name,
				hd->tmPending));
			return FAILED;
		} else if (type == MPI_SCSITASKMGMT_TASKTYPE_RESET_BUS) {
			dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "TMHandler bus reset: "
			   "Timed out waiting for last TM (%d) to complete! \n",
			  ioc->name, hd->tmPending));
			return FAILED;
		}
	} else {
		spin_lock_irqsave(&ioc->FreeQlock, flags);
		hd->tmPending |=  (1 << type);
		spin_unlock_irqrestore(&ioc->FreeQlock, flags);
	}

	ioc_raw_state = mpt_GetIocState(ioc, 0);

	if ((ioc_raw_state & MPI_IOC_STATE_MASK) != MPI_IOC_STATE_OPERATIONAL) {
		printk(MYIOC_s_WARN_FMT
			"TM Handler for type=%x: IOC Not operational (0x%x)!\n",
			ioc->name, type, ioc_raw_state);
		printk(MYIOC_s_WARN_FMT " Issuing HardReset!!\n", ioc->name);
		if (mpt_HardResetHandler(ioc, CAN_SLEEP) < 0)
			printk(MYIOC_s_WARN_FMT "TMHandler: HardReset "
			    "FAILED!!\n", ioc->name);
		return FAILED;
	}

	if (ioc_raw_state & MPI_DOORBELL_ACTIVE) {
		printk(MYIOC_s_WARN_FMT
			"TM Handler for type=%x: ioc_state: "
			"DOORBELL_ACTIVE (0x%x)!\n",
			ioc->name, type, ioc_raw_state);
		return FAILED;
	}

	/* Isse the Task Mgmt request.
	 */
	if (hd->hard_resets < -1)
		hd->hard_resets++;

	rc = mptscsih_IssueTaskMgmt(hd, type, channel, id, lun,
	    ctx2abort, timeout);
	if (rc)
		printk(MYIOC_s_INFO_FMT "Issue of TaskMgmt failed!\n",
		       ioc->name);
	else
		dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "Issue of TaskMgmt Successful!\n",
			   ioc->name));

	dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT
			"TMHandler rc = %d!\n", ioc->name, rc));

	return rc;
}


/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/**
 *	mptscsih_IssueTaskMgmt - Generic send Task Management function.
 *	@hd: Pointer to MPT_SCSI_HOST structure
 *	@type: Task Management type
 *	@channel: channel number for task management
 *	@id: Logical Target ID for reset (if appropriate)
 *	@lun: Logical Unit for reset (if appropriate)
 *	@ctx2abort: Context for the task to be aborted (if appropriate)
 *	@timeout: timeout for task management control
 *
 *	Remark: _HardResetHandler can be invoked from an interrupt thread (timer)
 *	or a non-interrupt thread.  In the former, must not call schedule().
 *
 *	Not all fields are meaningfull for all task types.
 *
 *	Returns 0 for SUCCESS, or FAILED.
 *
 **/
static int
mptscsih_IssueTaskMgmt(MPT_SCSI_HOST *hd, u8 type, u8 channel, u8 id, int lun, int ctx2abort, ulong timeout)
{
	MPT_FRAME_HDR	*mf;
	SCSITaskMgmt_t	*pScsiTm;
	int		 ii;
	int		 retval;
	MPT_ADAPTER 	*ioc = hd->ioc;

	/* Return Fail to calling function if no message frames available.
	 */
	if ((mf = mpt_get_msg_frame(ioc->TaskCtx, ioc)) == NULL) {
		dfailprintk(ioc, printk(MYIOC_s_ERR_FMT "IssueTaskMgmt, no msg frames!!\n",
				ioc->name));
		return FAILED;
	}
	dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "IssueTaskMgmt request @ %p\n",
			ioc->name, mf));

	/* Format the Request
	 */
	pScsiTm = (SCSITaskMgmt_t *) mf;
	pScsiTm->TargetID = id;
	pScsiTm->Bus = channel;
	pScsiTm->ChainOffset = 0;
	pScsiTm->Function = MPI_FUNCTION_SCSI_TASK_MGMT;

	pScsiTm->Reserved = 0;
	pScsiTm->TaskType = type;
	pScsiTm->Reserved1 = 0;
	pScsiTm->MsgFlags = (type == MPI_SCSITASKMGMT_TASKTYPE_RESET_BUS)
                    ? MPI_SCSITASKMGMT_MSGFLAGS_LIPRESET_RESET_OPTION : 0;

	int_to_scsilun(lun, (struct scsi_lun *)pScsiTm->LUN);

	for (ii=0; ii < 7; ii++)
		pScsiTm->Reserved2[ii] = 0;

	pScsiTm->TaskMsgContext = ctx2abort;

	dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "IssueTaskMgmt: ctx2abort (0x%08x) "
		"type=%d\n", ioc->name, ctx2abort, type));

	DBG_DUMP_TM_REQUEST_FRAME(ioc, (u32 *)pScsiTm);

	if ((ioc->facts.IOCCapabilities & MPI_IOCFACTS_CAPABILITY_HIGH_PRI_Q) &&
	    (ioc->facts.MsgVersion >= MPI_VERSION_01_05))
		mpt_put_msg_frame_hi_pri(ioc->TaskCtx, ioc, mf);
	else {
		retval = mpt_send_handshake_request(ioc->TaskCtx, ioc,
			sizeof(SCSITaskMgmt_t), (u32*)pScsiTm, CAN_SLEEP);
		if (retval) {
			dfailprintk(ioc, printk(MYIOC_s_ERR_FMT "send_handshake FAILED!"
			" (hd %p, ioc %p, mf %p, rc=%d) \n", ioc->name, hd,
			ioc, mf, retval));
			goto fail_out;
		}
	}

	if(mptscsih_tm_wait_for_completion(hd, timeout) == FAILED) {
		dfailprintk(ioc, printk(MYIOC_s_ERR_FMT "task management request TIMED OUT!"
			" (hd %p, ioc %p, mf %p) \n", ioc->name, hd,
			ioc, mf));
		dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "Calling HardReset! \n",
			 ioc->name));
		retval = mpt_HardResetHandler(ioc, CAN_SLEEP);
		dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "rc=%d \n",
			 ioc->name, retval));
		goto fail_out;
	}

	/*
	 * Handle success case, see if theres a non-zero ioc_status.
	 */
	if (hd->tm_iocstatus == MPI_IOCSTATUS_SUCCESS ||
	   hd->tm_iocstatus == MPI_IOCSTATUS_SCSI_TASK_TERMINATED ||
	   hd->tm_iocstatus == MPI_IOCSTATUS_SCSI_IOC_TERMINATED)
		retval = 0;
	else
		retval = FAILED;

	return retval;

 fail_out:

	/*
	 * Free task managment mf, and corresponding tm flags
	 */
	mpt_free_msg_frame(ioc, mf);
	hd->tmPending = 0;
	hd->tmState = TM_STATE_NONE;
	return FAILED;
}

static int
mptscsih_get_tm_timeout(MPT_ADAPTER *ioc)
{
	switch (ioc->bus_type) {
	case FC:
		return 40;
	case SAS:
		return 10;
	case SPI:
	default:
		return 2;
	}
}

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/**
 *	mptscsih_abort - Abort linux scsi_cmnd routine, new_eh variant
 *	@SCpnt: Pointer to scsi_cmnd structure, IO to be aborted
 *
 *	(linux scsi_host_template.eh_abort_handler routine)
 *
 *	Returns SUCCESS or FAILED.
 **/
int
mptscsih_abort(struct scsi_cmnd * SCpnt)
{
	MPT_SCSI_HOST	*hd;
	MPT_FRAME_HDR	*mf;
	u32		 ctx2abort;
	int		 scpnt_idx;
	int		 retval;
	VirtDevice	 *vdevice;
	ulong	 	 sn = SCpnt->serial_number;
	MPT_ADAPTER	*ioc;

	/* If we can't locate our host adapter structure, return FAILED status.
	 */
	if ((hd = shost_priv(SCpnt->device->host)) == NULL) {
		SCpnt->result = DID_RESET << 16;
		SCpnt->scsi_done(SCpnt);
		printk(KERN_ERR MYNAM ": task abort: "
		    "can't locate host! (sc=%p)\n", SCpnt);
		return FAILED;
	}

	ioc = hd->ioc;
	printk(MYIOC_s_INFO_FMT "attempting task abort! (sc=%p)\n",
	       ioc->name, SCpnt);
	scsi_print_command(SCpnt);

	vdevice = SCpnt->device->hostdata;
	if (!vdevice || !vdevice->vtarget) {
		dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT
		    "task abort: device has been deleted (sc=%p)\n",
		    ioc->name, SCpnt));
		SCpnt->result = DID_NO_CONNECT << 16;
		SCpnt->scsi_done(SCpnt);
		retval = 0;
		goto out;
	}

	/* Task aborts are not supported for hidden raid components.