aic7xxx_core.c

h内核

		if ((scb->flags & SCB_SENSE) != 0) {
			/*
			 * Clear the SCB_SENSE Flag and have
			 * the sequencer do a normal command
			 * complete.
			 */
			scb->flags &= ~SCB_SENSE;
			ahc_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
			break;
		}
		ahc_set_transaction_status(scb, CAM_SCSI_STATUS_ERROR);
		/* Freeze the queue until the client sees the error. */
		ahc_freeze_devq(ahc, scb);
		ahc_freeze_scb(scb);
		ahc_set_scsi_status(scb, hscb->shared_data.status.scsi_status);
		switch (hscb->shared_data.status.scsi_status) {
		case SCSI_STATUS_OK:
			printf("%s: Interrupted for staus of 0???\n",
			       ahc_name(ahc));
			break;
		case SCSI_STATUS_CMD_TERMINATED:
		case SCSI_STATUS_CHECK_COND:
		{
			struct ahc_dma_seg *sg;
			struct scsi_sense *sc;
			struct ahc_initiator_tinfo *targ_info;
			struct ahc_tmode_tstate *tstate;
			struct ahc_transinfo *tinfo;
#ifdef AHC_DEBUG
			if (ahc_debug & AHC_SHOW_SENSE) {
				ahc_print_path(ahc, scb);
				printf("SCB %d: requests Check Status\n",
				       scb->hscb->tag);
			}
#endif

			if (ahc_perform_autosense(scb) == 0)
				break;

			targ_info = ahc_fetch_transinfo(ahc,
							devinfo.channel,
							devinfo.our_scsiid,
							devinfo.target,
							&tstate);
			tinfo = &targ_info->curr;
			sg = scb->sg_list;
			sc = (struct scsi_sense *)(&hscb->shared_data.cdb); 
			/*
			 * Save off the residual if there is one.
			 */
			ahc_update_residual(ahc, scb);
#ifdef AHC_DEBUG
			if (ahc_debug & AHC_SHOW_SENSE) {
				ahc_print_path(ahc, scb);
				printf("Sending Sense\n");
			}
#endif
			sg->addr = ahc_get_sense_bufaddr(ahc, scb);
			sg->len = ahc_get_sense_bufsize(ahc, scb);
			sg->len |= AHC_DMA_LAST_SEG;

			/* Fixup byte order */
			sg->addr = ahc_htole32(sg->addr);
			sg->len = ahc_htole32(sg->len);

			sc->opcode = REQUEST_SENSE;
			sc->byte2 = 0;
			if (tinfo->protocol_version <= SCSI_REV_2
			 && SCB_GET_LUN(scb) < 8)
				sc->byte2 = SCB_GET_LUN(scb) << 5;
			sc->unused[0] = 0;
			sc->unused[1] = 0;
			sc->length = sg->len;
			sc->control = 0;

			/*
			 * We can't allow the target to disconnect.
			 * This will be an untagged transaction and
			 * having the target disconnect will make this
			 * transaction indestinguishable from outstanding
			 * tagged transactions.
			 */
			hscb->control = 0;

			/*
			 * This request sense could be because the
			 * the device lost power or in some other
			 * way has lost our transfer negotiations.
			 * Renegotiate if appropriate.  Unit attention
			 * errors will be reported before any data
			 * phases occur.
			 */
			if (ahc_get_residual(scb) 
			 == ahc_get_transfer_length(scb)) {
				ahc_update_neg_request(ahc, &devinfo,
						       tstate, targ_info,
						       AHC_NEG_IF_NON_ASYNC);
			}
			if (tstate->auto_negotiate & devinfo.target_mask) {
				hscb->control |= MK_MESSAGE;
				scb->flags &= ~SCB_NEGOTIATE;
				scb->flags |= SCB_AUTO_NEGOTIATE;
			}
			hscb->cdb_len = sizeof(*sc);
			hscb->dataptr = sg->addr; 
			hscb->datacnt = sg->len;
			hscb->sgptr = scb->sg_list_phys | SG_FULL_RESID;
			hscb->sgptr = ahc_htole32(hscb->sgptr);
			scb->sg_count = 1;
			scb->flags |= SCB_SENSE;
			ahc_qinfifo_requeue_tail(ahc, scb);
			ahc_outb(ahc, RETURN_1, SEND_SENSE);
			/*
			 * Ensure we have enough time to actually
			 * retrieve the sense.
			 */
			ahc_scb_timer_reset(scb, 5 * 1000000);
			break;
		}
		default:
			break;
		}
		break;
	}
	case NO_MATCH:
	{
		/* Ensure we don't leave the selection hardware on */
		ahc_outb(ahc, SCSISEQ,
			 ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));

		printf("%s:%c:%d: no active SCB for reconnecting "
		       "target - issuing BUS DEVICE RESET\n",
		       ahc_name(ahc), devinfo.channel, devinfo.target);
		printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
		       "ARG_1 == 0x%x ACCUM = 0x%x\n",
		       ahc_inb(ahc, SAVED_SCSIID), ahc_inb(ahc, SAVED_LUN),
		       ahc_inb(ahc, ARG_1), ahc_inb(ahc, ACCUM));
		printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
		       "SINDEX == 0x%x\n",
		       ahc_inb(ahc, SEQ_FLAGS), ahc_inb(ahc, SCBPTR),
		       ahc_index_busy_tcl(ahc,
			    BUILD_TCL(ahc_inb(ahc, SAVED_SCSIID),
				      ahc_inb(ahc, SAVED_LUN))),
		       ahc_inb(ahc, SINDEX));
		printf("SCSIID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
		       "SCB_TAG == 0x%x, SCB_CONTROL == 0x%x\n",
		       ahc_inb(ahc, SCSIID), ahc_inb(ahc, SCB_SCSIID),
		       ahc_inb(ahc, SCB_LUN), ahc_inb(ahc, SCB_TAG),
		       ahc_inb(ahc, SCB_CONTROL));
		printf("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
		       ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
		printf("SXFRCTL0 == 0x%x\n", ahc_inb(ahc, SXFRCTL0));
		printf("SEQCTL == 0x%x\n", ahc_inb(ahc, SEQCTL));
		ahc_dump_card_state(ahc);
		ahc->msgout_buf[0] = MSG_BUS_DEV_RESET;
		ahc->msgout_len = 1;
		ahc->msgout_index = 0;
		ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
		ahc_outb(ahc, MSG_OUT, HOST_MSG);
		ahc_assert_atn(ahc);
		break;
	}
	case SEND_REJECT: 
	{
		u_int rejbyte = ahc_inb(ahc, ACCUM);
		printf("%s:%c:%d: Warning - unknown message received from "
		       "target (0x%x).  Rejecting\n", 
		       ahc_name(ahc), devinfo.channel, devinfo.target, rejbyte);
		break; 
	}
	case PROTO_VIOLATION:
	{
		ahc_handle_proto_violation(ahc);
		break;
	}
	case IGN_WIDE_RES:
		ahc_handle_ign_wide_residue(ahc, &devinfo);
		break;
	case PDATA_REINIT:
		ahc_reinitialize_dataptrs(ahc);
		break;
	case BAD_PHASE:
	{
		u_int lastphase;

		lastphase = ahc_inb(ahc, LASTPHASE);
		printf("%s:%c:%d: unknown scsi bus phase %x, "
		       "lastphase = 0x%x.  Attempting to continue\n",
		       ahc_name(ahc), devinfo.channel, devinfo.target,
		       lastphase, ahc_inb(ahc, SCSISIGI));
		break;
	}
	case MISSED_BUSFREE:
	{
		u_int lastphase;

		lastphase = ahc_inb(ahc, LASTPHASE);
		printf("%s:%c:%d: Missed busfree. "
		       "Lastphase = 0x%x, Curphase = 0x%x\n",
		       ahc_name(ahc), devinfo.channel, devinfo.target,
		       lastphase, ahc_inb(ahc, SCSISIGI));
		ahc_restart(ahc);
		return;
	}
	case HOST_MSG_LOOP:
	{
		/*
		 * The sequencer has encountered a message phase
		 * that requires host assistance for completion.
		 * While handling the message phase(s), we will be
		 * notified by the sequencer after each byte is
		 * transfered so we can track bus phase changes.
		 *
		 * If this is the first time we've seen a HOST_MSG_LOOP
		 * interrupt, initialize the state of the host message
		 * loop.
		 */
		if (ahc->msg_type == MSG_TYPE_NONE) {
			struct scb *scb;
			u_int scb_index;
			u_int bus_phase;

			bus_phase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
			if (bus_phase != P_MESGIN
			 && bus_phase != P_MESGOUT) {
				printf("ahc_intr: HOST_MSG_LOOP bad "
				       "phase 0x%x\n",
				      bus_phase);
				/*
				 * Probably transitioned to bus free before
				 * we got here.  Just punt the message.
				 */
				ahc_clear_intstat(ahc);
				ahc_restart(ahc);
				return;
			}

			scb_index = ahc_inb(ahc, SCB_TAG);
			scb = ahc_lookup_scb(ahc, scb_index);
			if (devinfo.role == ROLE_INITIATOR) {
				if (scb == NULL)
					panic("HOST_MSG_LOOP with "
					      "invalid SCB %x\n", scb_index);

				if (bus_phase == P_MESGOUT)
					ahc_setup_initiator_msgout(ahc,
								   &devinfo,
								   scb);
				else {
					ahc->msg_type =
					    MSG_TYPE_INITIATOR_MSGIN;
					ahc->msgin_index = 0;
				}
			}
#ifdef AHC_TARGET_MODE
			else {
				if (bus_phase == P_MESGOUT) {
					ahc->msg_type =
					    MSG_TYPE_TARGET_MSGOUT;
					ahc->msgin_index = 0;
				}
				else 
					ahc_setup_target_msgin(ahc,
							       &devinfo,
							       scb);
			}
#endif
		}

		ahc_handle_message_phase(ahc);
		break;
	}
	case PERR_DETECTED:
	{
		/*
		 * If we've cleared the parity error interrupt
		 * but the sequencer still believes that SCSIPERR
		 * is true, it must be that the parity error is
		 * for the currently presented byte on the bus,
		 * and we are not in a phase (data-in) where we will
		 * eventually ack this byte.  Ack the byte and
		 * throw it away in the hope that the target will
		 * take us to message out to deliver the appropriate
		 * error message.
		 */
		if ((intstat & SCSIINT) == 0
		 && (ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0) {

			if ((ahc->features & AHC_DT) == 0) {
				u_int curphase;

				/*
				 * The hardware will only let you ack bytes
				 * if the expected phase in SCSISIGO matches
				 * the current phase.  Make sure this is
				 * currently the case.
				 */
				curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
				ahc_outb(ahc, LASTPHASE, curphase);
				ahc_outb(ahc, SCSISIGO, curphase);
			}
			if ((ahc_inb(ahc, SCSISIGI) & (CDI|MSGI)) == 0) {
				int wait;

				/*
				 * In a data phase.  Faster to bitbucket
				 * the data than to individually ack each
				 * byte.  This is also the only strategy
				 * that will work with AUTOACK enabled.
				 */
				ahc_outb(ahc, SXFRCTL1,
					 ahc_inb(ahc, SXFRCTL1) | BITBUCKET);
				wait = 5000;
				while (--wait != 0) {
					if ((ahc_inb(ahc, SCSISIGI)
					  & (CDI|MSGI)) != 0)
						break;
					ahc_delay(100);
				}
				ahc_outb(ahc, SXFRCTL1,
					 ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
				if (wait == 0) {
					struct	scb *scb;
					u_int	scb_index;

					ahc_print_devinfo(ahc, &devinfo);
					printf("Unable to clear parity error.  "
					       "Resetting bus.\n");
					scb_index = ahc_inb(ahc, SCB_TAG);
					scb = ahc_lookup_scb(ahc, scb_index);
					if (scb != NULL)
						ahc_set_transaction_status(scb,
						    CAM_UNCOR_PARITY);
					ahc_reset_channel(ahc, devinfo.channel, 
							  /*init reset*/TRUE);
				}
			} else {
				ahc_inb(ahc, SCSIDATL);
			}
		}
		break;
	}
	case DATA_OVERRUN:
	{
		/*
		 * When the sequencer detects an overrun, it
		 * places the controller in "BITBUCKET" mode
		 * and allows the target to complete its transfer.
		 * Unfortunately, none of the counters get updated
		 * when the controller is in this mode, so we have
		 * no way of knowing how large the overrun was.
		 */
		u_int scbindex = ahc_inb(ahc, SCB_TAG);
		u_int lastphase = ahc_inb(ahc, LASTPHASE);
		u_int i;

		scb = ahc_lookup_scb(ahc, scbindex);
		for (i = 0; i < num_phases; i++) {
			if (lastphase == ahc_phase_table[i].phase)
				break;
		}
		ahc_print_path(ahc, scb);
		printf("data overrun detected %s."
		       "  Tag == 0x%x.\n",
		       ahc_phase_table[i].phasemsg,
  		       scb->hscb->tag);
		ahc_print_path(ahc, scb);
		printf("%s seen Data Phase.  Length = %ld.  NumSGs = %d.\n",
		       ahc_inb(ahc, SEQ_FLAGS) & DPHASE ? "Have" : "Haven't",
		       ahc_get_transfer_length(scb), scb->sg_count);
		if (scb->sg_count > 0) {
			for (i = 0; i < scb->sg_count; i++) {

				printf("sg[%d] - Addr 0x%x%x : Length %d\n",
				       i,
				       (ahc_le32toh(scb->sg_list[i].len) >> 24
				        & SG_HIGH_ADDR_BITS),
				       ahc_le32toh(scb->sg_list[i].addr),
				       ahc_le32toh(scb->sg_list[i].len)
				       & AHC_SG_LEN_MASK);
			}
		}
		/*
		 * Set this and it will take effect when the
		 * target does a command complete.
		 */
		ahc_freeze_devq(ahc, scb);
		if ((scb->flags & SCB_SENSE) == 0) {
			ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
		} else {
			scb->flags &= ~SCB_SENSE;
			ahc_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
		}
		ahc_freeze_scb(scb);

		if ((ahc->features & AHC_ULTRA2) != 0) {
			/*
			 * Clear the channel in case we return
			 * to data phase later.
			 */
			ahc_outb(ahc, SXFRCTL0,
				 ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
			ahc_outb(ahc, SXFRCTL0,
				 ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
		}
		if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
			u_int dscommand1;

			/* Ensure HHADDR is 0 for future DMA operations. */
			dscommand1 = ahc_inb(ahc, DSCOMMAND1);
			ahc_outb(ahc, DSCOMMAND1, dscommand1 | HADDLDSEL0);
			ahc_outb(ahc, HADDR, 0);
			ahc_outb(ahc, DSCOMMAND1, dscommand1);
		}
		break;
	}
	case MKMSG_FAILED:
	{
		u_int scbindex;

		printf("%s:%c:%d:%d: Attempt to issue message failed\n",
		       ahc_name(ahc), devinfo.channel, devinfo.target,
		       devinfo.lun);
		scbindex = ahc_inb(ahc, SCB_TAG);
		scb = ahc_lookup_scb(ahc, scbindex);
		if (scb != NULL
		 && (scb->flags & SCB_RECOVERY_SCB) != 0)
			/*
			 * Ensure that we didn't put a second instance of this
			 * SCB into the QINFIFO.
			 */
			ahc_search_qinfifo(ahc, SCB_GET_TARGET(ahc, scb),
					   SCB_GET_CHANNEL(ahc, scb),
					   SCB_GET_LUN(scb), scb->hscb->tag,
					   ROLE_INITIATOR, /*status*/0,
					   SEARCH_REMOVE);
		break;
	}
	case NO_FREE_SCB:
	{
		printf("%s: No free or disconnected SCBs\n", ahc_name(ahc));
		ahc_dump_card_state(ahc);
		panic("for safety");
		break;
	}
	case SCB_MISMATCH:
	{
		u_int scbptr;

		scbptr = ahc_inb(ahc, SCBPTR);
		printf("Bogus TAG after DMA.  SCBPTR %d, tag %d, our tag %d\n",
		       scbptr, ahc_inb(ahc, ARG_1),
		       ahc->scb_data->hscbs[scbptr].tag);