aic79xx_core.c

linux-2.4.29操作系统的源码

				printf("%s: Invalid SCB %d in DFF%d "
				       "during unexpected busfree\n",
				       ahd_name(ahd), scbid, mode);
				packetized = 0;
			} else
				packetized = (scb->flags & SCB_PACKETIZED) != 0;
			clear_fifo = 1;
			break;
		}
		case BUSFREE_LQO:
			clear_fifo = 0;
			packetized = 1;
			break;
		default:
			clear_fifo = 0;
			packetized =  (lqostat1 & LQOBUSFREE) != 0;
			if (!packetized
			 && ahd_inb(ahd, LASTPHASE) == P_BUSFREE)
				packetized = 1;
			break;
		}

#ifdef AHD_DEBUG
		if ((ahd_debug & AHD_SHOW_MISC) != 0)
			printf("Saw Busfree.  Busfreetime = 0x%x.\n",
			       busfreetime);
#endif
		/*
		 * Busfrees that occur in non-packetized phases are
		 * handled by the nonpkt_busfree handler.
		 */
		if (packetized && ahd_inb(ahd, LASTPHASE) == P_BUSFREE) {
			restart = ahd_handle_pkt_busfree(ahd, busfreetime);
		} else {
			packetized = 0;
			restart = ahd_handle_nonpkt_busfree(ahd);
		}
		/*
		 * Clear the busfree interrupt status.  The setting of
		 * the interrupt is a pulse, so in a perfect world, we
		 * would not need to muck with the ENBUSFREE logic.  This
		 * would ensure that if the bus moves on to another
		 * connection, busfree protection is still in force.  If
		 * BUSFREEREV is broken, however, we must manually clear
		 * the ENBUSFREE if the busfree occurred during a non-pack
		 * connection so that we don't get false positives during
		 * future, packetized, connections.
		 */
		ahd_outb(ahd, CLRSINT1, CLRBUSFREE);
		if (packetized == 0
		 && (ahd->bugs & AHD_BUSFREEREV_BUG) != 0)
			ahd_outb(ahd, SIMODE1,
				 ahd_inb(ahd, SIMODE1) & ~ENBUSFREE);

		if (clear_fifo)
			ahd_clear_fifo(ahd, mode);

		ahd_clear_msg_state(ahd);
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		if (restart) {
			ahd_restart(ahd);
		} else {
			ahd_unpause(ahd);
		}
	} else {
		printf("%s: Missing case in ahd_handle_scsiint. status = %x\n",
		       ahd_name(ahd), status);
		ahd_dump_card_state(ahd);
		ahd_clear_intstat(ahd);
		ahd_unpause(ahd);
	}
}

static void
ahd_handle_transmission_error(struct ahd_softc *ahd)
{
	struct	scb *scb;
	u_int	scbid;
	u_int	lqistat1;
	u_int	lqistat2;
	u_int	msg_out;
	u_int	curphase;
	u_int	lastphase;
	u_int	perrdiag;
	u_int	cur_col;
	int	silent;

	scb = NULL;
	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	lqistat1 = ahd_inb(ahd, LQISTAT1) & ~(LQIPHASE_LQ|LQIPHASE_NLQ);
	lqistat2 = ahd_inb(ahd, LQISTAT2);
	if ((lqistat1 & (LQICRCI_NLQ|LQICRCI_LQ)) == 0
	 && (ahd->bugs & AHD_NLQICRC_DELAYED_BUG) != 0) {
		u_int lqistate;

		ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
		lqistate = ahd_inb(ahd, LQISTATE);
		if ((lqistate >= 0x1E && lqistate <= 0x24)
		 || (lqistate == 0x29)) {
#ifdef AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_RECOVERY) != 0) {
				printf("%s: NLQCRC found via LQISTATE\n",
				       ahd_name(ahd));
			}
#endif
			lqistat1 |= LQICRCI_NLQ;
		}
		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	}

	ahd_outb(ahd, CLRLQIINT1, lqistat1);
	lastphase = ahd_inb(ahd, LASTPHASE);
	curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
	perrdiag = ahd_inb(ahd, PERRDIAG);
	msg_out = MSG_INITIATOR_DET_ERR;
	ahd_outb(ahd, CLRSINT1, CLRSCSIPERR);
	
	/*
	 * Try to find the SCB associated with this error.
	 */
	silent = FALSE;
	if (lqistat1 == 0
	 || (lqistat1 & LQICRCI_NLQ) != 0) {
	 	if ((lqistat1 & (LQICRCI_NLQ|LQIOVERI_NLQ)) != 0)
			ahd_set_active_fifo(ahd);
		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb != NULL && SCB_IS_SILENT(scb))
			silent = TRUE;
	}

	cur_col = 0;
	if (silent == FALSE) {
		printf("%s: Transmission error detected\n", ahd_name(ahd));
		ahd_lqistat1_print(lqistat1, &cur_col, 50);
		ahd_lastphase_print(lastphase, &cur_col, 50);
		ahd_scsisigi_print(curphase, &cur_col, 50);
		ahd_perrdiag_print(perrdiag, &cur_col, 50);
		printf("\n");
		ahd_dump_card_state(ahd);
	}

	if ((lqistat1 & (LQIOVERI_LQ|LQIOVERI_NLQ)) != 0) {
		if (silent == FALSE) {
			printf("%s: Gross protocol error during incoming "
			       "packet.  lqistat1 == 0x%x.  Resetting bus.\n",
			       ahd_name(ahd), lqistat1);
		}
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		return;
	} else if ((lqistat1 & LQICRCI_LQ) != 0) {
		/*
		 * A CRC error has been detected on an incoming LQ.
		 * The bus is currently hung on the last ACK.
		 * Hit LQIRETRY to release the last ack, and
		 * wait for the sequencer to determine that ATNO
		 * is asserted while in message out to take us
		 * to our host message loop.  No NONPACKREQ or
		 * LQIPHASE type errors will occur in this
		 * scenario.  After this first LQIRETRY, the LQI
		 * manager will be in ISELO where it will
		 * happily sit until another packet phase begins.
		 * Unexpected bus free detection is enabled
		 * through any phases that occur after we release
		 * this last ack until the LQI manager sees a
		 * packet phase.  This implies we may have to
		 * ignore a perfectly valid "unexected busfree"
		 * after our "initiator detected error" message is
		 * sent.  A busfree is the expected response after
		 * we tell the target that it's L_Q was corrupted.
		 * (SPI4R09 10.7.3.3.3)
		 */
		ahd_outb(ahd, LQCTL2, LQIRETRY);
		printf("LQIRetry for LQICRCI_LQ to release ACK\n");
	} else if ((lqistat1 & LQICRCI_NLQ) != 0) {
		/*
		 * We detected a CRC error in a NON-LQ packet.
		 * The hardware has varying behavior in this situation
		 * depending on whether this packet was part of a
		 * stream or not.
		 *
		 * PKT by PKT mode:
		 * The hardware has already acked the complete packet.
		 * If the target honors our outstanding ATN condition,
		 * we should be (or soon will be) in MSGOUT phase.
		 * This will trigger the LQIPHASE_LQ status bit as the
		 * hardware was expecting another LQ.  Unexpected
		 * busfree detection is enabled.  Once LQIPHASE_LQ is
		 * true (first entry into host message loop is much
		 * the same), we must clear LQIPHASE_LQ and hit
		 * LQIRETRY so the hardware is ready to handle
		 * a future LQ.  NONPACKREQ will not be asserted again
		 * once we hit LQIRETRY until another packet is
		 * processed.  The target may either go busfree
		 * or start another packet in response to our message.
		 *
		 * Read Streaming P0 asserted:
		 * If we raise ATN and the target completes the entire
		 * stream (P0 asserted during the last packet), the
		 * hardware will ack all data and return to the ISTART
		 * state.  When the target reponds to our ATN condition,
		 * LQIPHASE_LQ will be asserted.  We should respond to
		 * this with an LQIRETRY to prepare for any future
		 * packets.  NONPACKREQ will not be asserted again
		 * once we hit LQIRETRY until another packet is
		 * processed.  The target may either go busfree or
		 * start another packet in response to our message.
		 * Busfree detection is enabled.
		 *
		 * Read Streaming P0 not asserted:
		 * If we raise ATN and the target transitions to
		 * MSGOUT in or after a packet where P0 is not
		 * asserted, the hardware will assert LQIPHASE_NLQ.
		 * We should respond to the LQIPHASE_NLQ with an
		 * LQIRETRY.  Should the target stay in a non-pkt
		 * phase after we send our message, the hardware
		 * will assert LQIPHASE_LQ.  Recovery is then just as
		 * listed above for the read streaming with P0 asserted.
		 * Busfree detection is enabled.
		 */
		if (silent == FALSE)
			printf("LQICRC_NLQ\n");
		if (scb == NULL) {
			printf("%s: No SCB valid for LQICRC_NLQ.  "
			       "Resetting bus\n", ahd_name(ahd));
			ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
			return;
		}
	} else if ((lqistat1 & LQIBADLQI) != 0) {
		printf("Need to handle BADLQI!\n");
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		return;
	} else if ((perrdiag & (PARITYERR|PREVPHASE)) == PARITYERR) {
		if ((curphase & ~P_DATAIN_DT) != 0) {
			/* Ack the byte.  So we can continue. */
			if (silent == FALSE)
				printf("Acking %s to clear perror\n",
				    ahd_lookup_phase_entry(curphase)->phasemsg);
			ahd_inb(ahd, SCSIDAT);
		}
	
		if (curphase == P_MESGIN)
			msg_out = MSG_PARITY_ERROR;
	}

	/*
	 * We've set the hardware to assert ATN if we 
	 * get a parity error on "in" phases, so all we
	 * need to do is stuff the message buffer with
	 * the appropriate message.  "In" phases have set
	 * mesg_out to something other than MSG_NOP.
	 */
	ahd->send_msg_perror = msg_out;
	if (scb != NULL && msg_out == MSG_INITIATOR_DET_ERR)
		scb->flags |= SCB_TRANSMISSION_ERROR;
	ahd_outb(ahd, MSG_OUT, HOST_MSG);
	ahd_outb(ahd, CLRINT, CLRSCSIINT);
	ahd_unpause(ahd);
}

static void
ahd_handle_lqiphase_error(struct ahd_softc *ahd, u_int lqistat1)
{
	/*
	 * Clear the sources of the interrupts.
	 */
	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	ahd_outb(ahd, CLRLQIINT1, lqistat1);

	/*
	 * If the "illegal" phase changes were in response
	 * to our ATN to flag a CRC error, AND we ended up
	 * on packet boundaries, clear the error, restart the
	 * LQI manager as appropriate, and go on our merry
	 * way toward sending the message.  Otherwise, reset
	 * the bus to clear the error.
	 */
	ahd_set_active_fifo(ahd);
	if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0
	 && (ahd_inb(ahd, MDFFSTAT) & DLZERO) != 0) {
		if ((lqistat1 & LQIPHASE_LQ) != 0) {
			printf("LQIRETRY for LQIPHASE_LQ\n");
			ahd_outb(ahd, LQCTL2, LQIRETRY);
		} else if ((lqistat1 & LQIPHASE_NLQ) != 0) {
			printf("LQIRETRY for LQIPHASE_NLQ\n");
			ahd_outb(ahd, LQCTL2, LQIRETRY);
		} else
			panic("ahd_handle_lqiphase_error: No phase errors\n");
		ahd_dump_card_state(ahd);
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		ahd_unpause(ahd);
	} else {
		printf("Reseting Channel for LQI Phase error\n");
		ahd_dump_card_state(ahd);
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
	}
}

/*
 * Packetized unexpected or expected busfree.
 * Entered in mode based on busfreetime.
 */
static int
ahd_handle_pkt_busfree(struct ahd_softc *ahd, u_int busfreetime)
{
	u_int lqostat1;

	AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
			 ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
	lqostat1 = ahd_inb(ahd, LQOSTAT1);
	if ((lqostat1 & LQOBUSFREE) != 0) {
		struct scb *scb;
		u_int scbid;
		u_int saved_scbptr;
		u_int waiting_h;
		u_int waiting_t;
		u_int next;

		if ((busfreetime & BUSFREE_LQO) == 0)
			printf("%s: Warning, BUSFREE time is 0x%x.  "
			       "Expected BUSFREE_LQO.\n",
			       ahd_name(ahd), busfreetime);
		/*
		 * The LQO manager detected an unexpected busfree
		 * either:
		 *
		 * 1) During an outgoing LQ.
		 * 2) After an outgoing LQ but before the first
		 *    REQ of the command packet.
		 * 3) During an outgoing command packet.
		 *
		 * In all cases, CURRSCB is pointing to the
		 * SCB that encountered the failure.  Clean
		 * up the queue, clear SELDO and LQOBUSFREE,
		 * and allow the sequencer to restart the select
		 * out at its lesure.
		 */
		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
		scbid = ahd_inw(ahd, CURRSCB);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL)
		       panic("SCB not valid during LQOBUSFREE");
		/*
		 * Clear the status.
		 */
		ahd_outb(ahd, CLRLQOINT1, CLRLQOBUSFREE);
		if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0)
			ahd_outb(ahd, CLRLQOINT1, 0);
		ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
		ahd_flush_device_writes(ahd);
		ahd_outb(ahd, CLRSINT0, CLRSELDO);

		/*
		 * Return the LQO manager to its idle loop.  It will
		 * not do this automatically if the busfree occurs
		 * after the first REQ of either the LQ or command
		 * packet or between the LQ and command packet.
		 */
		ahd_outb(ahd, LQCTL2, ahd_inb(ahd, LQCTL2) | LQOTOIDLE);

		/*
		 * Update the waiting for selection queue so
		 * we restart on the correct SCB.
		 */
		waiting_h = ahd_inw(ahd, WAITING_TID_HEAD);
		saved_scbptr = ahd_get_scbptr(ahd);
		if (waiting_h != scbid) {

			ahd_outw(ahd, WAITING_TID_HEAD, scbid);
			waiting_t = ahd_inw(ahd, WAITING_TID_TAIL);
			if (waiting_t == waiting_h) {
				ahd_outw(ahd, WAITING_TID_TAIL, scbid);
				next = SCB_LIST_NULL;
			} else {
				ahd_set_scbptr(ahd, waiting_h);
				next = ahd_inw_scbram(ahd, SCB_NEXT2);
			}
			ahd_set_scbptr(ahd, scbid);
			ahd_outw(ahd, SCB_NEXT2, next);
		}
		ahd_set_scbptr(ahd, saved_scbptr);
		if (scb->crc_retry_count < AHD_MAX_LQ_CRC_ERRORS) {
			if (SCB_IS_SILENT(scb) == FALSE) {
				ahd_print_path(ahd, scb);
				printf("Probable outgoing LQ CRC error.  "
				       "Retrying command\n");
			}
			scb->crc_retry_count++;
		} else {
			ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
			ahd_freeze_scb(scb);
			ahd_freeze_devq(ahd, scb);
		}
		/* Return unpausing the sequencer. */
		return (0);
	} else if ((ahd_inb(ahd, PERRDIAG) & PARITYERR) != 0) {
		/*
		 * Ignore what are really parity errors that
		 * occur on the last REQ of a free running
		 * clock prior to going busfree.  Some drives
		 * do not properly active negate just before
		 * going busfree resulting in a parity glitch.
		 */
		ahd_outb(ahd, CLRSINT1, CLRSCSIPERR|CLRBUSFREE);
#ifdef AHD_DEBUG
		if ((ahd_debug & AHD_SHOW_MASKED_ERRORS) != 0)
			printf("%s: Parity on last REQ detected "
			       "during busfree phase.\n",
			       ahd_name(ahd));
#endif
		/* Return unpausing the sequencer. */
		return (0);
	}
	if (ahd->src_mode != AHD_MODE_SCSI) {
		u_int	scbid;
		struct	scb *scb;

		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		ahd_print_path(ahd, scb);
		printf("Unexpected PKT busfree condition\n");
		ahd_dump_card_state(ahd);
		ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb), 'A',
			       SCB_GET_LUN(scb), SCB_GET_TAG(scb),
			       ROLE_INITIATOR, CAM_UNEXP_BUSFREE);

		/* Return restarting the sequencer. */
		return (1);
	}
	printf("%s: Unexpected PKT busfree condition\n", ahd_name(ahd));
	ahd_dump_card_state(ahd);
	/* Restart the sequencer. */
	return (1);
}

/*
 * Non-packetized unexpected or expected busfree.
 */
static int
ahd_handle_nonpkt_busfree(struct ahd_softc *ahd)
{