xbow.c

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     * do not activate the WAR, and
     * tell our caller we do not need
     * to be called again.
     */
    if ((part != BRIDGE_WIDGET_PART_NUM) ||
	(mfgr != BRIDGE_WIDGET_MFGR_NUM)) {
		/* FIXME: add Xbridge to the WAR.
		 * Shouldn't hurt anything.  Later need to
		 * check if we can remove this.
                 */
    		if ((part != XBRIDGE_WIDGET_PART_NUM) ||
		    (mfgr != XBRIDGE_WIDGET_MFGR_NUM))
			return 0;
    }

    /* count how many times we
     * have picked up after
     * LLP Transmit problems.
     */
    xbow_xmit_retry_errors++;

    /* rewrite the control register
     * to fix things up.
     */
    wid->w_control = wid->w_control;
    wid->w_control;

    return 1;
}

/*
 * xbow_errintr_handler will be called if the xbow
 * sends an interrupt request to report an error.
 */

#ifdef LATER
static void
xbow_errintr_handler(intr_arg_t arg)
{
#ifdef IRIX
    ioerror_t               ioe[1];
    xbow_soft_t             soft = (xbow_soft_t) arg;
    xbow_t                 *xbow = soft->base;
    xbowreg_t               wid_control;
    xbowreg_t               wid_stat;
    xbowreg_t               wid_err_cmdword;
    xbowreg_t               wid_err_upper;
    xbowreg_t               wid_err_lower;
    w_err_cmd_word_u        wid_err;
    uint64_t                 wid_err_addr;

    int                     fatal = 0;
    int                     dump_ioe = 0;

    wid_control = xbow->xb_wid_control;
    wid_stat = xbow->xb_wid_stat_clr;
    wid_err_cmdword = xbow->xb_wid_err_cmdword;
    wid_err_upper = xbow->xb_wid_err_upper;
    wid_err_lower = xbow->xb_wid_err_lower;
    xbow->xb_wid_err_cmdword = 0;

    wid_err_addr =
	wid_err_lower
	| (((iopaddr_t) wid_err_upper
	    & WIDGET_ERR_UPPER_ADDR_ONLY)
	   << 32);

    if (wid_stat & XB_WID_STAT_LINK_INTR_MASK) {
	int                     port;

	wid_err.r = wid_err_cmdword;

	for (port = MAX_PORT_NUM - MAX_XBOW_PORTS;
	     port < MAX_PORT_NUM; port++) {
	    if (wid_stat & XB_WID_STAT_LINK_INTR(port)) {
		xb_linkregs_t          *link = &(xbow->xb_link(port));
		xbowreg_t               link_control = link->link_control;
		xbowreg_t               link_status = link->link_status_clr;
		xbowreg_t               link_aux_status = link->link_aux_status;
		xbowreg_t               link_pend;

		link_pend = link_status & link_control &
		    (XB_STAT_ILLEGAL_DST_ERR
		     | XB_STAT_OALLOC_IBUF_ERR
		     | XB_STAT_RCV_CNT_OFLOW_ERR
		     | XB_STAT_XMT_CNT_OFLOW_ERR
		     | XB_STAT_XMT_MAX_RTRY_ERR
		     | XB_STAT_RCV_ERR
		     | XB_STAT_XMT_RTRY_ERR
		     | XB_STAT_MAXREQ_TOUT_ERR
		     | XB_STAT_SRC_TOUT_ERR
		    );

		if (link_pend & XB_STAT_ILLEGAL_DST_ERR) {
		    if (wid_err.f.sidn == port) {
			IOERROR_INIT(ioe);
			IOERROR_SETVALUE(ioe, widgetnum, port);
			IOERROR_SETVALUE(ioe, xtalkaddr, wid_err_addr);
			if (IOERROR_HANDLED ==
			    xbow_error_handler(soft,
					       IOECODE_DMA,
					       MODE_DEVERROR,
					       ioe)) {
			    link_pend &= ~XB_STAT_ILLEGAL_DST_ERR;
			} else {
			    dump_ioe++;
			}
		    }
		}
		/* Xbow/Bridge WAR:
		 * if the bridge signals an LLP Transmitter Retry,
		 * rewrite its control register.
		 * If someone else triggers this interrupt,
		 * ignore (and disable) the interrupt.
		 */
		if (link_pend & XB_STAT_XMT_RTRY_ERR) {
		    if (!xbow_xmit_retry_error(soft, port)) {
			link_control &= ~XB_CTRL_XMT_RTRY_IE;
			link->link_control = link_control;
			link->link_control;	/* stall until written */
		    }
		    link_pend &= ~XB_STAT_XMT_RTRY_ERR;
		}
		if (link_pend) {
		    devfs_handle_t	xwidget_vhdl;
		    char		*xwidget_name;
		    
		    /* Get the widget name corresponding to the current
		     * xbow link.
		     */
		    xwidget_vhdl = xbow_widget_lookup(soft->busv,port);
		    xwidget_name = xwidget_name_get(xwidget_vhdl);

#ifdef IRIX
		    cmn_err(CE_CONT,
			    "%s port %X[%s] XIO Bus Error",
			    soft->name, port, xwidget_name);
		    if (link_status & XB_STAT_MULTI_ERR)
			XEM_ADD_STR("\tMultiple Errors\n");
		    if (link_status & XB_STAT_ILLEGAL_DST_ERR)
			XEM_ADD_STR("\tInvalid Packet Destination\n");
		    if (link_status & XB_STAT_OALLOC_IBUF_ERR)
			XEM_ADD_STR("\tInput Overallocation Error\n");
		    if (link_status & XB_STAT_RCV_CNT_OFLOW_ERR)
			XEM_ADD_STR("\tLLP receive error counter overflow\n");
		    if (link_status & XB_STAT_XMT_CNT_OFLOW_ERR)
			XEM_ADD_STR("\tLLP transmit retry counter overflow\n");
		    if (link_status & XB_STAT_XMT_MAX_RTRY_ERR)
			XEM_ADD_STR("\tLLP Max Transmitter Retry\n");
		    if (link_status & XB_STAT_RCV_ERR)
			XEM_ADD_STR("\tLLP Receiver error\n");
		    if (link_status & XB_STAT_XMT_RTRY_ERR)
			XEM_ADD_STR("\tLLP Transmitter Retry\n");
		    if (link_status & XB_STAT_MAXREQ_TOUT_ERR)
			XEM_ADD_STR("\tMaximum Request Timeout\n");
		    if (link_status & XB_STAT_SRC_TOUT_ERR)
			XEM_ADD_STR("\tSource Timeout Error\n");
#endif

		    {
			int                     other_port;

			for (other_port = 8; other_port < 16; ++other_port) {
			    if (link_aux_status & (1 << other_port)) {
				/* XXX- need to go to "other_port"
				 * and clean up after the timeout?
				 */
				XEM_ADD_VAR(other_port);
			    }
			}
		    }

#if !DEBUG
		    if (kdebug) {
#endif
			XEM_ADD_VAR(link_control);
			XEM_ADD_VAR(link_status);
			XEM_ADD_VAR(link_aux_status);

			if (dump_ioe) {
			    XEM_ADD_IOE();
			    dump_ioe = 0;
			}
#if !DEBUG
		    }
#endif
		    fatal++;
		}
	    }
	}
    }
    if (wid_stat & wid_control & XB_WID_STAT_WIDGET0_INTR) {
	/* we have a "widget zero" problem */

	if (wid_stat & (XB_WID_STAT_MULTI_ERR
			| XB_WID_STAT_XTALK_ERR
			| XB_WID_STAT_REG_ACC_ERR)) {

	    cmn_err(CE_CONT,
		    "%s Port 0 XIO Bus Error",
		    soft->name);
	    if (wid_stat & XB_WID_STAT_MULTI_ERR)
		XEM_ADD_STR("\tMultiple Error\n");
	    if (wid_stat & XB_WID_STAT_XTALK_ERR)
		XEM_ADD_STR("\tXIO Error\n");
	    if (wid_stat & XB_WID_STAT_REG_ACC_ERR)
		XEM_ADD_STR("\tRegister Access Error\n");

	    fatal++;
	}
    }
    if (fatal) {
	XEM_ADD_VAR(wid_stat);
	XEM_ADD_VAR(wid_control);
	XEM_ADD_VAR(wid_err_cmdword);
	XEM_ADD_VAR(wid_err_upper);
	XEM_ADD_VAR(wid_err_lower);
	XEM_ADD_VAR(wid_err_addr);
	cmn_err_tag(8, CE_PANIC, "XIO Bus Error");
    }
#endif
}
#endif	/* LATER */

/*
 * XBOW ERROR Handling routines.
 * These get invoked as part of walking down the error handling path
 * from hub/heart towards the I/O device that caused the error.
 */

/*
 * xbow_error_handler
 *      XBow error handling dispatch routine.
 *      This is the primary interface used by external world to invoke
 *      in case of an error related to a xbow.
 *      Only functionality in this layer is to identify the widget handle
 *      given the widgetnum. Otherwise, xbow does not gathers any error
 *      data.
 */

#ifdef LATER
static int
xbow_error_handler(
		      void *einfo,
		      int error_code,
		      ioerror_mode_t mode,
		      ioerror_t *ioerror)
{
#ifdef IRIX
    int                     retval = IOERROR_WIDGETLEVEL;

    xbow_soft_t             soft = (xbow_soft_t) einfo;
    int                     port;
    devfs_handle_t            conn;
    devfs_handle_t            busv;

    xbow_t                 *xbow = soft->base;
    xbowreg_t               wid_stat;
    xbowreg_t               wid_err_cmdword;
    xbowreg_t               wid_err_upper;
    xbowreg_t               wid_err_lower;
    uint64_t                 wid_err_addr;

    xb_linkregs_t          *link;
    xbowreg_t               link_control;
    xbowreg_t               link_status;
    xbowreg_t               link_aux_status;

    ASSERT(soft != 0);
    busv = soft->busv;

#if DEBUG && ERROR_DEBUG
    cmn_err(CE_CONT, "%s: xbow_error_handler\n", soft->name, busv);
#endif

    port = IOERROR_GETVALUE(ioerror, widgetnum);

    if (port == 0) {
	/* error during access to xbow:
	 * do NOT attempt to access xbow regs.
	 */
	if (mode == MODE_DEVPROBE)
	    return IOERROR_HANDLED;

	if (error_code & IOECODE_DMA) {
	    cmn_err(CE_ALERT,
		    "DMA error blamed on Crossbow at %s\n"
		    "\tbut Crosbow never initiates DMA!",
		    soft->name);
	}
	if (error_code & IOECODE_PIO) {
	    cmn_err(CE_ALERT,
		    "PIO Error on XIO Bus %s\n"
		    "\tattempting to access XIO controller\n"
		    "\twith offset 0x%X",
		    soft->name,
		    IOERROR_GETVALUE(ioerror, xtalkaddr));
	}
	/* caller will dump contents of ioerror
	 * in DEBUG and kdebug kernels.
	 */

	return retval;
    }
    /*
     * error not on port zero:
     * safe to read xbow registers.
     */
    wid_stat = xbow->xb_wid_stat;
    wid_err_cmdword = xbow->xb_wid_err_cmdword;
    wid_err_upper = xbow->xb_wid_err_upper;
    wid_err_lower = xbow->xb_wid_err_lower;

    wid_err_addr =
	wid_err_lower
	| (((iopaddr_t) wid_err_upper
	    & WIDGET_ERR_UPPER_ADDR_ONLY)
	   << 32);

    if ((port < BASE_XBOW_PORT) ||
	(port >= MAX_PORT_NUM)) {

	if (mode == MODE_DEVPROBE)
	    return IOERROR_HANDLED;

	if (error_code & IOECODE_DMA) {
	    cmn_err(CE_ALERT,
		    "DMA error blamed on XIO port at %s/%d\n"
		    "\tbut Crossbow does not support that port",
		    soft->name, port);
	}
	if (error_code & IOECODE_PIO) {
	    cmn_err(CE_ALERT,
		    "PIO Error on XIO Bus %s\n"
		    "\tattempting to access XIO port %d\n"
		    "\t(which Crossbow does not support)"
		    "\twith offset 0x%X",
		    soft->name, port,
		    IOERROR_GETVALUE(ioerror, xtalkaddr));
	}
#if !DEBUG
	if (kdebug) {
#endif
	    XEM_ADD_STR("Raw status values for Crossbow:\n");
	    XEM_ADD_VAR(wid_stat);
	    XEM_ADD_VAR(wid_err_cmdword);
	    XEM_ADD_VAR(wid_err_upper);
	    XEM_ADD_VAR(wid_err_lower);
	    XEM_ADD_VAR(wid_err_addr);
#if !DEBUG
	}
#endif

	/* caller will dump contents of ioerror
	 * in DEBUG and kdebug kernels.
	 */

	return retval;
    }
    /* access to valid port:
     * ok to check port status.
     */

    link = &(xbow->xb_link(port));
    link_control = link->link_control;
    link_status = link->link_status;
    link_aux_status = link->link_aux_status;

    /* Check that there is something present
     * in that XIO port.
     */
    if (!(link_aux_status & XB_AUX_STAT_PRESENT)) {
	/* nobody connected. */
	if (mode == MODE_DEVPROBE)
	    return IOERROR_HANDLED;

	if (error_code & IOECODE_DMA) {
	    cmn_err(CE_ALERT,
		    "DMA error blamed on XIO port at %s/%d\n"
		    "\tbut there is no device connected there.",
		    soft->name, port);
	}
	if (error_code & IOECODE_PIO) {
	    cmn_err(CE_ALERT,
		    "PIO Error on XIO Bus %s\n"
		    "\tattempting to access XIO port %d\n"
		    "\t(which has no device connected)"
		    "\twith offset 0x%X",
		    soft->name, port,
		    IOERROR_GETVALUE(ioerror, xtalkaddr));
	}
#if !DEBUG
	if (kdebug) {
#endif
	    XEM_ADD_STR("Raw status values for Crossbow:\n");
	    XEM_ADD_VAR(wid_stat);
	    XEM_ADD_VAR(wid_err_cmdword);
	    XEM_ADD_VAR(wid_err_upper);
	    XEM_ADD_VAR(wid_err_lower);
	    XEM_ADD_VAR(wid_err_addr);
	    XEM_ADD_VAR(port);
	    XEM_ADD_VAR(link_control);
	    XEM_ADD_VAR(link_status);
	    XEM_ADD_VAR(link_aux_status);
#if !DEBUG
	}
#endif
	return retval;

    }
    /* Check that the link is alive.
     */
    if (!(link_status & XB_STAT_LINKALIVE)) {
	/* nobody connected. */
	if (mode == MODE_DEVPROBE)
	    return IOERROR_HANDLED;

	cmn_err(CE_ALERT,
		"%s%sError on XIO Bus %s port %d",
		(error_code & IOECODE_DMA) ? "DMA " : "",
		(error_code & IOECODE_PIO) ? "PIO " : "",
		soft->name, port);

	if ((error_code & IOECODE_PIO) &&
	    (IOERROR_FIELDVALID(ioerror, xtalkaddr))) {
	    cmn_err(CE_CONT,
		    "\tAccess attempted to offset 0x%X\n",
		    IOERROR_GETVALUE(ioerror, xtalkaddr));
	}
	if (link_aux_status & XB_AUX_LINKFAIL_RST_BAD)
	    XEM_ADD_STR("\tLink never came out of reset\n");
	else
	    XEM_ADD_STR("\tLink failed while transferring data\n");

    }
    /* get the connection point for the widget
     * involved in this error; if it exists and
     * is not our connectpoint, cycle back through
     * xtalk_error_handler to deliver control to
     * the proper handler (or to report a generic
     * crosstalk error).
     *
     * If the downstream handler won't handle
     * the problem, we let our upstream caller
     * deal with it, after (in DEBUG and kdebug
     * kernels) dumping the xbow state for this
     * port.
     */
    conn = xbow_widget_lookup(busv, port);
    if ((conn != GRAPH_VERTEX_NONE) &&
	(conn != soft->conn)) {
	retval = xtalk_error_handler(conn, error_code, mode, ioerror);
	if (retval == IOERROR_HANDLED)
	    return IOERROR_HANDLED;
    }
    if (mode == MODE_DEVPROBE)
	return IOERROR_HANDLED;

    if (retval == IOERROR_UNHANDLED) {
	retval = IOERROR_PANIC;

	cmn_err(CE_ALERT,
		"%s%sError on XIO Bus %s port %d",
		(error_code & IOECODE_DMA) ? "DMA " : "",
		(error_code & IOECODE_PIO) ? "PIO " : "",
		soft->name, port);