aic79xx_core.c

linux-2.4.29操作系统的源码

	struct	ahd_devinfo devinfo;
	struct	scb *scb;
	u_int	lastphase;
	u_int	saved_scsiid;
	u_int	saved_lun;
	u_int	target;
	u_int	initiator_role_id;
	u_int	scbid;
	u_int	ppr_busfree;
	int	printerror;

	/*
	 * Look at what phase we were last in.  If its message out,
	 * chances are pretty good that the busfree was in response
	 * to one of our abort requests.
	 */
	lastphase = ahd_inb(ahd, LASTPHASE);
	saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
	saved_lun = ahd_inb(ahd, SAVED_LUN);
	target = SCSIID_TARGET(ahd, saved_scsiid);
	initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
	ahd_compile_devinfo(&devinfo, initiator_role_id,
			    target, saved_lun, 'A', ROLE_INITIATOR);
	printerror = 1;

	scbid = ahd_get_scbptr(ahd);
	scb = ahd_lookup_scb(ahd, scbid);
	if (scb != NULL
	 && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
		scb = NULL;

	ppr_busfree = (ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0;
	if (lastphase == P_MESGOUT) {
		u_int tag;

		tag = SCB_LIST_NULL;
		if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT_TAG, TRUE)
		 || ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT, TRUE)) {
			int found;
			int sent_msg;

			if (scb == NULL) {
				ahd_print_devinfo(ahd, &devinfo);
				printf("Abort for unidentified "
				       "connection completed.\n");
				/* restart the sequencer. */
				return (1);
			}
			sent_msg = ahd->msgout_buf[ahd->msgout_index - 1];
			ahd_print_path(ahd, scb);
			printf("SCB %d - Abort%s Completed.\n",
			       SCB_GET_TAG(scb),
			       sent_msg == MSG_ABORT_TAG ? "" : " Tag");

			if (sent_msg == MSG_ABORT_TAG)
				tag = SCB_GET_TAG(scb);

			if ((scb->flags & SCB_CMDPHASE_ABORT) != 0) {
				/*
				 * This abort is in response to an
				 * unexpected switch to command phase
				 * for a packetized connection.  Since
				 * the identify message was never sent,
				 * "saved lun" is 0.  We really want to
				 * abort only the SCB that encountered
				 * this error, which could have a different
				 * lun.  The SCB will be retried so the OS
				 * will see the UA after renegotiating to
				 * packetized.
				 */
				tag = SCB_GET_TAG(scb);
				saved_lun = scb->hscb->lun;
			}
			found = ahd_abort_scbs(ahd, target, 'A', saved_lun,
					       tag, ROLE_INITIATOR,
					       CAM_REQ_ABORTED);
			printf("found == 0x%x\n", found);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_1B,
					MSG_BUS_DEV_RESET, TRUE)) {
#ifdef __FreeBSD__
			/*
			 * Don't mark the user's request for this BDR
			 * as completing with CAM_BDR_SENT.  CAM3
			 * specifies CAM_REQ_CMP.
			 */
			if (scb != NULL
			 && scb->io_ctx->ccb_h.func_code== XPT_RESET_DEV
			 && ahd_match_scb(ahd, scb, target, 'A',
					  CAM_LUN_WILDCARD, SCB_LIST_NULL,
					  ROLE_INITIATOR))
				ahd_set_transaction_status(scb, CAM_REQ_CMP);
#endif
			ahd_handle_devreset(ahd, &devinfo, CAM_LUN_WILDCARD,
					    CAM_BDR_SENT, "Bus Device Reset",
					    /*verbose_level*/0);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, FALSE)
			&& ppr_busfree == 0) {
			struct ahd_initiator_tinfo *tinfo;
			struct ahd_tmode_tstate *tstate;

			/*
			 * PPR Rejected.  Try non-ppr negotiation
			 * and retry command.
			 */
#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("PPR negotiation rejected busfree.\n");
#endif
			tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
						    devinfo.our_scsiid,
						    devinfo.target, &tstate);
			tinfo->curr.transport_version = 2;
			tinfo->goal.transport_version = 2;
			tinfo->goal.ppr_options = 0;
			ahd_qinfifo_requeue_tail(ahd, scb);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, FALSE)
			&& ppr_busfree == 0) {
			/*
			 * Negotiation Rejected.  Go-narrow and
			 * retry command.
			 */
#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("WDTR negotiation rejected busfree.\n");
#endif
			ahd_set_width(ahd, &devinfo,
				      MSG_EXT_WDTR_BUS_8_BIT,
				      AHD_TRANS_CUR|AHD_TRANS_GOAL,
				      /*paused*/TRUE);
			ahd_qinfifo_requeue_tail(ahd, scb);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, FALSE)
			&& ppr_busfree == 0) {
			/*
			 * Negotiation Rejected.  Go-async and
			 * retry command.
			 */
#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("SDTR negotiation rejected busfree.\n");
#endif
			ahd_set_syncrate(ahd, &devinfo,
					/*period*/0, /*offset*/0,
					/*ppr_options*/0,
					AHD_TRANS_CUR|AHD_TRANS_GOAL,
					/*paused*/TRUE);
			ahd_qinfifo_requeue_tail(ahd, scb);
			printerror = 0;
		} else if ((ahd->msg_flags & MSG_FLAG_EXPECT_IDE_BUSFREE) != 0
			&& ahd_sent_msg(ahd, AHDMSG_1B,
					 MSG_INITIATOR_DET_ERR, TRUE)) {

#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("Expected IDE Busfree\n");
#endif
			printerror = 0;
		} else if ((ahd->msg_flags & MSG_FLAG_EXPECT_QASREJ_BUSFREE)
			&& ahd_sent_msg(ahd, AHDMSG_1B,
					MSG_MESSAGE_REJECT, TRUE)) {

#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("Expected QAS Reject Busfree\n");
#endif
			printerror = 0;
		}
	}

	/*
	 * The busfree required flag is honored at the end of
	 * the message phases.  We check it last in case we
	 * had to send some other message that caused a busfree.
	 */
	if (printerror != 0
	 && (lastphase == P_MESGIN || lastphase == P_MESGOUT)
	 && ((ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0)) {

		ahd_freeze_devq(ahd, scb);
		ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
		ahd_freeze_scb(scb);
		if ((ahd->msg_flags & MSG_FLAG_IU_REQ_CHANGED) != 0) {
			ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
				       SCB_GET_CHANNEL(ahd, scb),
				       SCB_GET_LUN(scb), SCB_LIST_NULL,
				       ROLE_INITIATOR, CAM_REQ_ABORTED);
		} else {
#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("PPR Negotiation Busfree.\n");
#endif
			ahd_done(ahd, scb);
		}
		printerror = 0;
	}
	if (printerror != 0) {
		int aborted;

		aborted = 0;
		if (scb != NULL) {
			u_int tag;

			if ((scb->hscb->control & TAG_ENB) != 0)
				tag = SCB_GET_TAG(scb);
			else
				tag = SCB_LIST_NULL;
			ahd_print_path(ahd, scb);
			aborted = ahd_abort_scbs(ahd, target, 'A',
				       SCB_GET_LUN(scb), tag,
				       ROLE_INITIATOR,
				       CAM_UNEXP_BUSFREE);
		} else {
			/*
			 * We had not fully identified this connection,
			 * so we cannot abort anything.
			 */
			printf("%s: ", ahd_name(ahd));
		}
		if (lastphase != P_BUSFREE)
			ahd_force_renegotiation(ahd, &devinfo);
		printf("Unexpected busfree %s, %d SCBs aborted, "
		       "PRGMCNT == 0x%x\n",
		       ahd_lookup_phase_entry(lastphase)->phasemsg,
		       aborted,
		       ahd_inb(ahd, PRGMCNT)
			| (ahd_inb(ahd, PRGMCNT+1) << 8));
		ahd_dump_card_state(ahd);
	}
	/* Always restart the sequencer. */
	return (1);
}

static void
ahd_handle_proto_violation(struct ahd_softc *ahd)
{
	struct	ahd_devinfo devinfo;
	struct	scb *scb;
	u_int	scbid;
	u_int	seq_flags;
	u_int	curphase;
	u_int	lastphase;
	int	found;

	ahd_fetch_devinfo(ahd, &devinfo);
	scbid = ahd_get_scbptr(ahd);
	scb = ahd_lookup_scb(ahd, scbid);
	seq_flags = ahd_inb(ahd, SEQ_FLAGS);
	curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
	lastphase = ahd_inb(ahd, LASTPHASE);
	if ((seq_flags & NOT_IDENTIFIED) != 0) {

		/*
		 * The reconnecting target either did not send an
		 * identify message, or did, but we didn't find an SCB
		 * to match.
		 */
		ahd_print_devinfo(ahd, &devinfo);
		printf("Target did not send an IDENTIFY message. "
		       "LASTPHASE = 0x%x.\n", lastphase);
		scb = NULL;
	} else if (scb == NULL) {
		/*
		 * We don't seem to have an SCB active for this
		 * transaction.  Print an error and reset the bus.
		 */
		ahd_print_devinfo(ahd, &devinfo);
		printf("No SCB found during protocol violation\n");
		goto proto_violation_reset;
	} else {
		ahd_set_transaction_status(scb, CAM_SEQUENCE_FAIL);
		if ((seq_flags & NO_CDB_SENT) != 0) {
			ahd_print_path(ahd, scb);
			printf("No or incomplete CDB sent to device.\n");
		} else if ((ahd_inb_scbram(ahd, SCB_CONTROL)
			  & STATUS_RCVD) == 0) {
			/*
			 * The target never bothered to provide status to
			 * us prior to completing the command.  Since we don't
			 * know the disposition of this command, we must attempt
			 * to abort it.  Assert ATN and prepare to send an abort
			 * message.
			 */
			ahd_print_path(ahd, scb);
			printf("Completed command without status.\n");
		} else {
			ahd_print_path(ahd, scb);
			printf("Unknown protocol violation.\n");
			ahd_dump_card_state(ahd);
		}
	}
	if ((lastphase & ~P_DATAIN_DT) == 0
	 || lastphase == P_COMMAND) {
proto_violation_reset:
		/*
		 * Target either went directly to data
		 * phase or didn't respond to our ATN.
		 * The only safe thing to do is to blow
		 * it away with a bus reset.
		 */
		found = ahd_reset_channel(ahd, 'A', TRUE);
		printf("%s: Issued Channel %c Bus Reset. "
		       "%d SCBs aborted\n", ahd_name(ahd), 'A', found);
	} else {
		/*
		 * Leave the selection hardware off in case
		 * this abort attempt will affect yet to
		 * be sent commands.
		 */
		ahd_outb(ahd, SCSISEQ0,
			 ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
		ahd_assert_atn(ahd);
		ahd_outb(ahd, MSG_OUT, HOST_MSG);
		if (scb == NULL) {
			ahd_print_devinfo(ahd, &devinfo);
			ahd->msgout_buf[0] = MSG_ABORT_TASK;
			ahd->msgout_len = 1;
			ahd->msgout_index = 0;
			ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
		} else {
			ahd_print_path(ahd, scb);
			scb->flags |= SCB_ABORT;
		}
		printf("Protocol violation %s.  Attempting to abort.\n",
		       ahd_lookup_phase_entry(curphase)->phasemsg);
	}
}

/*
 * Force renegotiation to occur the next time we initiate
 * a command to the current device.
 */
static void
ahd_force_renegotiation(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
{
	struct	ahd_initiator_tinfo *targ_info;
	struct	ahd_tmode_tstate *tstate;

#ifdef AHD_DEBUG
	if ((ahd_debug & AHD_SHOW_MESSAGES) != 0) {
		ahd_print_devinfo(ahd, devinfo);
		printf("Forcing renegotiation\n");
	}
#endif
	targ_info = ahd_fetch_transinfo(ahd,
					devinfo->channel,
					devinfo->our_scsiid,
					devinfo->target,
					&tstate);
	ahd_update_neg_request(ahd, devinfo, tstate,
			       targ_info, AHD_NEG_IF_NON_ASYNC);
}

#define AHD_MAX_STEPS 2000
void
ahd_clear_critical_section(struct ahd_softc *ahd)
{
	ahd_mode_state	saved_modes;
	int		stepping;
	int		steps;
	int		first_instr;
	u_int		simode0;
	u_int		simode1;
	u_int		simode3;
	u_int		lqimode0;
	u_int		lqimode1;
	u_int		lqomode0;
	u_int		lqomode1;

	if (ahd->num_critical_sections == 0)
		return;

	stepping = FALSE;
	steps = 0;
	first_instr = 0;
	simode0 = 0;
	simode1 = 0;
	simode3 = 0;
	lqimode0 = 0;
	lqimode1 = 0;
	lqomode0 = 0;
	lqomode1 = 0;
	saved_modes = ahd_save_modes(ahd);
	for (;;) {
		struct	cs *cs;
		u_int	seqaddr;
		u_int	i;

		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
		seqaddr = ahd_inb(ahd, CURADDR)
			| (ahd_inb(ahd, CURADDR+1) << 8);

		cs = ahd->critical_sections;
		for (i = 0; i < ahd->num_critical_sections; i++, cs++) {
			
			if (cs->begin < seqaddr && cs->end >= seqaddr)
				break;
		}

		if (i == ahd->num_critical_sections)
			break;

		if (steps > AHD_MAX_STEPS) {
			printf("%s: Infinite loop in critical section\n"
			       "%s: First Instruction 0x%x now 0x%x\n",
			       ahd_name(ahd), ahd_name(ahd), first_instr,
			       seqaddr);
			ahd_dump_card_state(ahd);
			panic("critical section loop");
		}

		steps++;
#ifdef AHD_DEBUG
		if ((ahd_debug & AHD_SHOW_MISC) != 0)
			printf("%s: Single stepping at 0x%x\n", ahd_name(ahd),
			       seqaddr);
#endif
		if (stepping == FALSE) {

			first_instr = seqaddr;
  			ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
  			simode0 = ahd_inb(ahd, SIMODE0);
			simode3 = ahd_inb(ahd, SIMODE3);
			lqimode0 = ahd_inb(ahd, LQIMODE0);
			lqimode1 = ahd_inb(ahd, LQIMODE1);
			lqomode0 = ahd_inb(ahd, LQOMODE0);
			lqomode1 = ahd_inb(ahd, LQOMODE1);
			ahd_outb(ahd, SIMODE0, 0);
			ahd_outb(ahd, SIMODE3, 0);
			ahd_outb(ahd, LQIMODE0, 0);
			ahd_outb(ahd, LQIMODE1, 0);
			ahd_outb(ahd, LQOMODE0, 0);
			ahd_outb(ahd, LQOMODE1, 0);
			ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
  			simode1