aic7xxx_osm.c

来自「linux 内核源代码」· C语言 代码 · 共 2,346 行 · 第 1/5 页

		 */
		dev->openings = 1;
		ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
		ahc_platform_set_tags(ahc, sdev, &devinfo,
			     (dev->flags & AHC_DEV_Q_BASIC)
			   ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
		break;
	}
	}
}

static void
ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
{
	/*
	 * Map CAM error codes into Linux Error codes.  We
	 * avoid the conversion so that the DV code has the
	 * full error information available when making
	 * state change decisions.
	 */
	{
		u_int new_status;

		switch (ahc_cmd_get_transaction_status(cmd)) {
		case CAM_REQ_INPROG:
		case CAM_REQ_CMP:
		case CAM_SCSI_STATUS_ERROR:
			new_status = DID_OK;
			break;
		case CAM_REQ_ABORTED:
			new_status = DID_ABORT;
			break;
		case CAM_BUSY:
			new_status = DID_BUS_BUSY;
			break;
		case CAM_REQ_INVALID:
		case CAM_PATH_INVALID:
			new_status = DID_BAD_TARGET;
			break;
		case CAM_SEL_TIMEOUT:
			new_status = DID_NO_CONNECT;
			break;
		case CAM_SCSI_BUS_RESET:
		case CAM_BDR_SENT:
			new_status = DID_RESET;
			break;
		case CAM_UNCOR_PARITY:
			new_status = DID_PARITY;
			break;
		case CAM_CMD_TIMEOUT:
			new_status = DID_TIME_OUT;
			break;
		case CAM_UA_ABORT:
		case CAM_REQ_CMP_ERR:
		case CAM_AUTOSENSE_FAIL:
		case CAM_NO_HBA:
		case CAM_DATA_RUN_ERR:
		case CAM_UNEXP_BUSFREE:
		case CAM_SEQUENCE_FAIL:
		case CAM_CCB_LEN_ERR:
		case CAM_PROVIDE_FAIL:
		case CAM_REQ_TERMIO:
		case CAM_UNREC_HBA_ERROR:
		case CAM_REQ_TOO_BIG:
			new_status = DID_ERROR;
			break;
		case CAM_REQUEUE_REQ:
			new_status = DID_REQUEUE;
			break;
		default:
			/* We should never get here */
			new_status = DID_ERROR;
			break;
		}

		ahc_cmd_set_transaction_status(cmd, new_status);
	}

	cmd->scsi_done(cmd);
}

static void
ahc_linux_freeze_simq(struct ahc_softc *ahc)
{
	unsigned long s;

	ahc_lock(ahc, &s);
	ahc->platform_data->qfrozen++;
	if (ahc->platform_data->qfrozen == 1) {
		scsi_block_requests(ahc->platform_data->host);

		/* XXX What about Twin channels? */
		ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
					CAM_LUN_WILDCARD, SCB_LIST_NULL,
					ROLE_INITIATOR, CAM_REQUEUE_REQ);
	}
	ahc_unlock(ahc, &s);
}

static void
ahc_linux_release_simq(struct ahc_softc *ahc)
{
	u_long s;
	int    unblock_reqs;

	unblock_reqs = 0;
	ahc_lock(ahc, &s);
	if (ahc->platform_data->qfrozen > 0)
		ahc->platform_data->qfrozen--;
	if (ahc->platform_data->qfrozen == 0)
		unblock_reqs = 1;
	ahc_unlock(ahc, &s);
	/*
	 * There is still a race here.  The mid-layer
	 * should keep its own freeze count and use
	 * a bottom half handler to run the queues
	 * so we can unblock with our own lock held.
	 */
	if (unblock_reqs)
		scsi_unblock_requests(ahc->platform_data->host);
}

static int
ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
{
	struct ahc_softc *ahc;
	struct ahc_linux_device *dev;
	struct scb *pending_scb;
	u_int  saved_scbptr;
	u_int  active_scb_index;
	u_int  last_phase;
	u_int  saved_scsiid;
	u_int  cdb_byte;
	int    retval;
	int    was_paused;
	int    paused;
	int    wait;
	int    disconnected;
	unsigned long flags;

	pending_scb = NULL;
	paused = FALSE;
	wait = FALSE;
	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;

	scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
	       flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");

	printf("CDB:");
	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
		printf(" 0x%x", cmd->cmnd[cdb_byte]);
	printf("\n");

	ahc_lock(ahc, &flags);

	/*
	 * First determine if we currently own this command.
	 * Start by searching the device queue.  If not found
	 * there, check the pending_scb list.  If not found
	 * at all, and the system wanted us to just abort the
	 * command, return success.
	 */
	dev = scsi_transport_device_data(cmd->device);

	if (dev == NULL) {
		/*
		 * No target device for this command exists,
		 * so we must not still own the command.
		 */
		printf("%s:%d:%d:%d: Is not an active device\n",
		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);
		retval = SUCCESS;
		goto no_cmd;
	}

	if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
	 && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
				       cmd->device->channel + 'A',
				       cmd->device->lun,
				       CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
		printf("%s:%d:%d:%d: Command found on untagged queue\n",
		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);
		retval = SUCCESS;
		goto done;
	}

	/*
	 * See if we can find a matching cmd in the pending list.
	 */
	LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
		if (pending_scb->io_ctx == cmd)
			break;
	}

	if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {

		/* Any SCB for this device will do for a target reset */
		LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
		  	if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
					  scmd_channel(cmd) + 'A',
					  CAM_LUN_WILDCARD,
					  SCB_LIST_NULL, ROLE_INITIATOR))
				break;
		}
	}

	if (pending_scb == NULL) {
		scmd_printk(KERN_INFO, cmd, "Command not found\n");
		goto no_cmd;
	}

	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
		/*
		 * We can't queue two recovery actions using the same SCB
		 */
		retval = FAILED;
		goto  done;
	}

	/*
	 * Ensure that the card doesn't do anything
	 * behind our back and that we didn't "just" miss
	 * an interrupt that would affect this cmd.
	 */
	was_paused = ahc_is_paused(ahc);
	ahc_pause_and_flushwork(ahc);
	paused = TRUE;

	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
		goto no_cmd;
	}

	printf("%s: At time of recovery, card was %spaused\n",
	       ahc_name(ahc), was_paused ? "" : "not ");
	ahc_dump_card_state(ahc);

	disconnected = TRUE;
	if (flag == SCB_ABORT) {
		if (ahc_search_qinfifo(ahc, cmd->device->id,
				       cmd->device->channel + 'A',
				       cmd->device->lun,
				       pending_scb->hscb->tag,
				       ROLE_INITIATOR, CAM_REQ_ABORTED,
				       SEARCH_COMPLETE) > 0) {
			printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
			       ahc_name(ahc), cmd->device->channel,
					cmd->device->id, cmd->device->lun);
			retval = SUCCESS;
			goto done;
		}
	} else if (ahc_search_qinfifo(ahc, cmd->device->id,
				      cmd->device->channel + 'A',
				      cmd->device->lun, pending_scb->hscb->tag,
				      ROLE_INITIATOR, /*status*/0,
				      SEARCH_COUNT) > 0) {
		disconnected = FALSE;
	}

	if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
		struct scb *bus_scb;

		bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
		if (bus_scb == pending_scb)
			disconnected = FALSE;
		else if (flag != SCB_ABORT
		      && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
		      && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
			disconnected = FALSE;
	}

	/*
	 * At this point, pending_scb is the scb associated with the
	 * passed in command.  That command is currently active on the
	 * bus, is in the disconnected state, or we're hoping to find
	 * a command for the same target active on the bus to abuse to
	 * send a BDR.  Queue the appropriate message based on which of
	 * these states we are in.
	 */
	last_phase = ahc_inb(ahc, LASTPHASE);
	saved_scbptr = ahc_inb(ahc, SCBPTR);
	active_scb_index = ahc_inb(ahc, SCB_TAG);
	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
	if (last_phase != P_BUSFREE
	 && (pending_scb->hscb->tag == active_scb_index
	  || (flag == SCB_DEVICE_RESET
	   && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {

		/*
		 * We're active on the bus, so assert ATN
		 * and hope that the target responds.
		 */
		pending_scb = ahc_lookup_scb(ahc, active_scb_index);
		pending_scb->flags |= SCB_RECOVERY_SCB|flag;
		ahc_outb(ahc, MSG_OUT, HOST_MSG);
		ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
		scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
		wait = TRUE;
	} else if (disconnected) {

		/*
		 * Actually re-queue this SCB in an attempt
		 * to select the device before it reconnects.
		 * In either case (selection or reselection),
		 * we will now issue the approprate message
		 * to the timed-out device.
		 *
		 * Set the MK_MESSAGE control bit indicating
		 * that we desire to send a message.  We
		 * also set the disconnected flag since
		 * in the paging case there is no guarantee
		 * that our SCB control byte matches the
		 * version on the card.  We don't want the
		 * sequencer to abort the command thinking
		 * an unsolicited reselection occurred.
		 */
		pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
		pending_scb->flags |= SCB_RECOVERY_SCB|flag;

		/*
		 * Remove any cached copy of this SCB in the
		 * disconnected list in preparation for the
		 * queuing of our abort SCB.  We use the
		 * same element in the SCB, SCB_NEXT, for
		 * both the qinfifo and the disconnected list.
		 */
		ahc_search_disc_list(ahc, cmd->device->id,
				     cmd->device->channel + 'A',
				     cmd->device->lun, pending_scb->hscb->tag,
				     /*stop_on_first*/TRUE,
				     /*remove*/TRUE,
				     /*save_state*/FALSE);

		/*
		 * In the non-paging case, the sequencer will
		 * never re-reference the in-core SCB.
		 * To make sure we are notified during
		 * reslection, set the MK_MESSAGE flag in
		 * the card's copy of the SCB.
		 */
		if ((ahc->flags & AHC_PAGESCBS) == 0) {
			ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
			ahc_outb(ahc, SCB_CONTROL,
				 ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
		}

		/*
		 * Clear out any entries in the QINFIFO first
		 * so we are the next SCB for this target
		 * to run.
		 */
		ahc_search_qinfifo(ahc, cmd->device->id,
				   cmd->device->channel + 'A',
				   cmd->device->lun, SCB_LIST_NULL,
				   ROLE_INITIATOR, CAM_REQUEUE_REQ,
				   SEARCH_COMPLETE);
		ahc_qinfifo_requeue_tail(ahc, pending_scb);
		ahc_outb(ahc, SCBPTR, saved_scbptr);
		ahc_print_path(ahc, pending_scb);
		printf("Device is disconnected, re-queuing SCB\n");
		wait = TRUE;
	} else {
		scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
		retval = FAILED;
		goto done;
	}

no_cmd:
	/*
	 * Our assumption is that if we don't have the command, no
	 * recovery action was required, so we return success.  Again,
	 * the semantics of the mid-layer recovery engine are not
	 * well defined, so this may change in time.
	 */
	retval = SUCCESS;
done:
	if (paused)
		ahc_unpause(ahc);
	if (wait) {
		DECLARE_COMPLETION_ONSTACK(done);

		ahc->platform_data->eh_done = &done;
		ahc_unlock(ahc, &flags);

		printf("Recovery code sleeping\n");
		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
			ahc_lock(ahc, &flags);
			ahc->platform_data->eh_done = NULL;
			ahc_unlock(ahc, &flags);

			printf("Timer Expired\n");
			retval = FAILED;
		}
		printf("Recovery code awake\n");
	} else
		ahc_unlock(ahc, &flags);
	return (retval);
}

void
ahc_platform_dump_card_state(struct ahc_softc *ahc)
{
}

static void ahc_linux_set_width(struct scsi_target *starget, int width)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
	struct ahc_devinfo devinfo;
	unsigned long flags;

	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
			    starget->channel + 'A', ROLE_INITIATOR);
	ahc_lock(ahc, &flags);
	ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
	ahc_unlock(ahc, &flags);
}

static void ahc_linux_set_period(struct scsi_target *starget, int period)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
	struct ahc_tmode_tstate *tstate;
	struct ahc_initiator_tinfo *tinfo 
		= ahc_fetch_transinfo(ahc,
				      starget->channel + 'A',
				      shost->this_id, starget->id, &tstate);
	struct ahc_devinfo devinfo;
	unsigned int ppr_options = tinfo->goal.ppr_options;
	unsigned long flags;
	unsigned long offset = tinfo->goal.offset;
	struct ahc_syncrate *syncrate;

	if (offset == 0)
		offset = MAX_OFFSET;

	if (period < 9)
		period = 9;	/* 12.5ns is our minimum */
	if (period == 9) {
		if (spi_max_width(starget))
			ppr_options |= MSG_EXT_PPR_DT_REQ;
		else
			/* need wide for DT and need DT for 12.5 ns */
			period = 10;
	}

	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
			    starget->channel + 'A', ROLE_INITIATOR);

	/* all PPR requests apart from QAS require wide transfers */
	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
		if (spi_width(starget) == 0)
			ppr_options &= MSG_EXT_PPR_QAS_REQ;
	}

	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
	ahc_lock(ahc, &flags);
	ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
			 ppr_options, AHC_TRANS_GOAL, FALSE);
	ahc_unlock(ahc, &flags);
}

static void ahc_linux_set_offset(struct scsi_target *starget, int offset)