pcibr_error.c

一个2.4.21版本的嵌入式linux内核

	    wb = map->bp_pciaddr;
	    ws = map->bp_mapsz;
	    cw = wx - PCIIO_SPACE_WIN(0);
	    if (cw < 6) {
		wb += pcibr_soft->bs_slot[cs].bss_window[cw].bssw_base;
		wx = pcibr_soft->bs_slot[cs].bss_window[cw].bssw_space;
	    }
	    if (wx == PCIIO_SPACE_ROM) {
		wb += pcibr_info->f_rbase;
		wx = PCIIO_SPACE_MEM;
	    }
	    if ((wx == PCIIO_SPACE_MEM32) ||
		(wx == PCIIO_SPACE_MEM64))
		wx = PCIIO_SPACE_MEM;
	    wl = wb + ws;
	    if ((wx == raw_space) && (raw_paddr >= wb) && (raw_paddr < wl)) {
		atomic_inc(&map->bp_toc[0]);
		if (slot == PCIIO_SLOT_NONE) {
		    slot = cs;
		    space = map->bp_space;
		    if (cw < 6)
			offset -= pcibr_soft->bs_slot[cs].bss_window[cw].bssw_base;
		}
	    }
	    }
	}
    }

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
                "pcibr_pioerror: offset=0x%x, slot=0x%x, func=0x%x\n",
		offset, slot, func));

    if (space != PCIIO_SPACE_NONE) {
	if (slot != PCIIO_SLOT_NONE) {
	    if (func != PCIIO_FUNC_NONE) {
		IOERROR_SETVALUE(ioe, widgetdev, 
				 pciio_widgetdev_create(slot,func));
	    }
	    else {
    		IOERROR_SETVALUE(ioe, widgetdev, 
				 pciio_widgetdev_create(slot,0));
	    }
	}
	IOERROR_SETVALUE(ioe, busspace, space);
	IOERROR_SETVALUE(ioe, busaddr, offset);
    }
    if (mode == MODE_DEVPROBE) {
	/*
	 * During probing, we don't really care what the
	 * error is. Clean up the error in Bridge, notify
	 * subsidiary devices, and return success.
	 */
	pcibr_error_cleanup(pcibr_soft, error_code);

	/* if appropriate, give the error handler for this slot
	 * a shot at this probe access as well.
	 */
	return (slot == PCIIO_SLOT_NONE) ? IOERROR_HANDLED :
	    pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);
    }
    /*
     * If we don't know what "PCI SPACE" the access
     * was targeting, we may have problems at the
     * Bridge itself. Don't touch any bridge registers,
     * and do complain loudly.
     */

    if (space == PCIIO_SPACE_NONE) {
	printk("XIO Bus Error at %s\n"
		"\taccess to XIO bus offset 0x%lx\n"
		"\tdoes not correspond to any PCI address\n",
		pcibr_soft->bs_name, bad_xaddr);

	/* caller will dump contents of ioe struct */
	return IOERROR_XTALKLEVEL;
    }

    /*
     * Actual PCI Error handling situation.
     * Typically happens when a user level process accesses
     * PCI space, and it causes some error.
     *
     * Due to PCI Bridge implementation, we get two indication
     * for a read error: an interrupt and a Bus error.
     * We like to handle read error in the bus error context.
     * But the interrupt comes and goes before bus error
     * could make much progress. (NOTE: interrupd does
     * come in _after_ bus error processing starts. But it's
     * completed by the time bus error code reaches PCI PIO
     * error handling.
     * Similarly write error results in just an interrupt,
     * and error handling has to be done at interrupt level.
     * There is no way to distinguish at interrupt time, if an
     * error interrupt is due to read/write error..
     */

    /* We know the xtalk addr, the raw PCI bus space,
     * the raw PCI bus address, the decoded PCI bus
     * space, the offset within that space, and the
     * decoded PCI slot (which may be "PCIIO_SLOT_NONE" if no slot
     * is known to be involved).
     */

    /*
     * Hand the error off to the handler registered
     * for the slot that should have decoded the error,
     * or to generic PCI handling (if pciio decides that
     * such is appropriate).
     */
    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);

    if (retval != IOERROR_HANDLED) {

	/* Generate a generic message for IOERROR_UNHANDLED
	 * since the subsidiary handlers were silent, and
	 * did no recovery.
	 */
	if (retval == IOERROR_UNHANDLED) {
	    retval = IOERROR_PANIC;

	    /* we may or may not want to print some of this,
	     * depending on debug level and which error code.
	     */

	    printk(KERN_ALERT
		    "PIO Error on PCI Bus %s",
		    pcibr_soft->bs_name);
	    /* this decodes part of the ioe; our caller
	     * will dump the raw details in DEBUG and
	     * kdebug kernels.
	     */
	    BEM_ADD_IOE(ioe);
	}
#if defined(FORCE_ERRORS)
	if (0) {
#elif !DEBUG
	if (kdebug) {
#endif
	    /*
	     * Dump raw data from Bridge/PCI layer.
	     */

	    BEM_ADD_STR("Raw info from Bridge/PCI layer:\n");
	    if (IS_PIC_SOFT(pcibr_soft)) {
		if (bridge->p_int_status_64 & (picreg_t)BRIDGE_ISR_PCIBUS_PIOERR)
		    pcibr_error_dump(pcibr_soft);
	    } else {
		if (bridge->b_int_status & (bridgereg_t)BRIDGE_ISR_PCIBUS_PIOERR)
		    pcibr_error_dump(pcibr_soft);
	    }
	    BEM_ADD_SPC(raw_space);
	    BEM_ADD_VAR(raw_paddr);
	    if (IOERROR_FIELDVALID(ioe, widgetdev)) {
		short widdev;
		IOERROR_GETVALUE(widdev, ioe, widgetdev);
		slot = pciio_widgetdev_slot_get(widdev);
		func = pciio_widgetdev_func_get(widdev);
		if (slot < PCIBR_NUM_SLOTS(pcibr_soft)) {
		    bridgereg_t             device = bridge->b_device[slot].reg;

		    BEM_ADD_VAR(slot);
		    BEM_ADD_VAR(func);
		    BEM_ADD_REG(device);
		}
	    }
#if !DEBUG || defined(FORCE_ERRORS)
	}
#endif

	/*
	 * Since error could not be handled at lower level,
	 * error data logged has not  been cleared.
	 * Clean up errors, and
	 * re-enable bridge to interrupt on error conditions.
	 * NOTE: Wheather we get the interrupt on PCI_ABORT or not is
	 * dependent on INT_ENABLE register. This write just makes sure
	 * that if the interrupt was enabled, we do get the interrupt.
	 *
	 * CAUTION: Resetting bit BRIDGE_IRR_PCI_GRP_CLR, acknowledges
	 *      a group of interrupts. If while handling this error,
	 *      some other error has occured, that would be
	 *      implicitly cleared by this write.
	 *      Need a way to ensure we don't inadvertently clear some
	 *      other errors.
	 */
	if (IOERROR_FIELDVALID(ioe, widgetdev)) {
		short widdev;
		IOERROR_GETVALUE(widdev, ioe, widgetdev);
		pcibr_device_disable(pcibr_soft, 
				 pciio_widgetdev_slot_get(widdev));
	}
	if (mode == MODE_DEVUSERERROR)
	    pcibr_error_cleanup(pcibr_soft, error_code);
    }
    return retval;
}

/*
 * bridge_dmaerror
 *      Some error was identified in a DMA transaction.
 *      This routine will identify the <device, address> that caused the error,
 *      and try to invoke the appropriate bus service to handle this.
 */

int
pcibr_dmard_error(
		     pcibr_soft_t pcibr_soft,
		     int error_code,
		     ioerror_mode_t mode,
		     ioerror_t *ioe)
{
    devfs_handle_t            pcibr_vhdl = pcibr_soft->bs_vhdl;
    bridge_t               *bridge = pcibr_soft->bs_base;
    bridgereg_t             bus_lowaddr, bus_uppraddr;
    int                     retval = 0;
    int                     bufnum;

    /*
     * In case of DMA errors, bridge should have logged the
     * address that caused the error.
     * Look up the address, in the bridge error registers, and
     * take appropriate action
     */
    {
	short tmp;
	IOERROR_GETVALUE(tmp, ioe, widgetnum);
	ASSERT(tmp == pcibr_soft->bs_xid);
    }
    ASSERT(bridge);

    /*
     * read error log registers
     */
    bus_lowaddr = bridge->b_wid_resp_lower;
    bus_uppraddr = bridge->b_wid_resp_upper;

    bufnum = BRIDGE_RESP_ERRUPPR_BUFNUM(bus_uppraddr);
    IOERROR_SETVALUE(ioe, widgetdev, 
		     pciio_widgetdev_create(
				    BRIDGE_RESP_ERRUPPR_DEVICE(bus_uppraddr),
				    0));
    IOERROR_SETVALUE(ioe, busaddr,
		     (bus_lowaddr |
		      ((iopaddr_t)
		       (bus_uppraddr &
			BRIDGE_ERRUPPR_ADDRMASK) << 32)));

    /*
     * need to ensure that the xtalk adress in ioe
     * maps to PCI error address read from bridge.
     * How to convert PCI address back to Xtalk address ?
     * (better idea: convert XTalk address to PCI address
     * and then do the compare!)
     */

    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);
    if (retval != IOERROR_HANDLED) {
	short tmp;
	IOERROR_GETVALUE(tmp, ioe, widgetdev);
	pcibr_device_disable(pcibr_soft, pciio_widgetdev_slot_get(tmp));
    }

    /*
     * Re-enable bridge to interrupt on BRIDGE_IRR_RESP_BUF_GRP_CLR
     * NOTE: Wheather we get the interrupt on BRIDGE_IRR_RESP_BUF_GRP_CLR or
     * not is dependent on INT_ENABLE register. This write just makes sure
     * that if the interrupt was enabled, we do get the interrupt.
     */
    bridge->b_int_rst_stat = BRIDGE_IRR_RESP_BUF_GRP_CLR;

    /*
     * Also, release the "bufnum" back to buffer pool that could be re-used.
     * This is done by "disabling" the buffer for a moment, then restoring
     * the original assignment.
     */

    {
	reg_p                   regp;
	bridgereg_t             regv;
	bridgereg_t             mask;

	regp = (bufnum & 1)
	    ? &bridge->b_odd_resp
	    : &bridge->b_even_resp;

	mask = 0xF << ((bufnum >> 1) * 4);

	regv = *regp;
	*regp = regv & ~mask;
	*regp = regv;
    }

    return retval;
}

/*
 * pcibr_dmawr_error:
 *      Handle a dma write error caused by a device attached to this bridge.
 *
 *      ioe has the widgetnum, widgetdev, and memaddr fields updated
 *      But we don't know the PCI address that corresponds to "memaddr"
 *      nor do we know which device driver is generating this address.
 *
 *      There is no easy way to find out the PCI address(es) that map
 *      to a specific system memory address. Bus handling code is also
 *      of not much help, since they don't keep track of the DMA mapping
 *      that have been handed out.
 *      So it's a dead-end at this time.
 *
 *      If translation is available, we could invoke the error handling
 *      interface of the device driver.
 */
/*ARGSUSED */
int
pcibr_dmawr_error(
		     pcibr_soft_t pcibr_soft,
		     int error_code,
		     ioerror_mode_t mode,
		     ioerror_t *ioe)
{
    devfs_handle_t            pcibr_vhdl = pcibr_soft->bs_vhdl;
    int                     retval;

    retval = pciio_error_handler(pcibr_vhdl, error_code, mode, ioe);

    if (retval != IOERROR_HANDLED) {
	short tmp;

	IOERROR_GETVALUE(tmp, ioe, widgetdev);
	pcibr_device_disable(pcibr_soft, pciio_widgetdev_slot_get(tmp));
    }
    return retval;
}

/*
 * Bridge error handler.
 *      Interface to handle all errors that involve bridge in some way.
 *
 *      This normally gets called from xtalk error handler.
 *      ioe has different set of fields set depending on the error that
 *      was encountered. So, we have a bit field indicating which of the
 *      fields are valid.
 *
 * NOTE: This routine could be operating in interrupt context. So,
 *      don't try to sleep here (till interrupt threads work!!)
 */
int
pcibr_error_handler(
		       error_handler_arg_t einfo,
		       int error_code,
		       ioerror_mode_t mode,
		       ioerror_t *ioe)
{
    pcibr_soft_t            pcibr_soft;
    int                     retval = IOERROR_BADERRORCODE;

#ifdef EHE_ENABLE
    devfs_handle_t	    xconn_vhdl,pcibr_vhdl;
    error_state_t	    e_state;
#endif /* EHE_ENABLE */

    pcibr_soft = (pcibr_soft_t) einfo;

    PCIBR_DEBUG_ALWAYS((PCIBR_DEBUG_ERROR_HDLR, pcibr_soft->bs_conn,
		"pcibr_error_handler: pcibr_soft=0x%x, error_code=0x%x\n",
		pcibr_soft, error_code));

#ifdef EHE_ENABLE
    xconn_vhdl = pcibr_soft->bs_conn;
    pcibr_vhdl = pcibr_soft->bs_vhdl;

    e_state = error_state_get(xconn_vhdl);
    
    if (error_state_set(pcibr_vhdl, e_state) == 
	ERROR_RETURN_CODE_CANNOT_SET_STATE)
	return(IOERROR_UNHANDLED);

    /* If we are in the action handling phase clean out the error state
     * on the xswitch.
     */
    if (e_state == ERROR_STATE_ACTION)
	(void)error_state_set(xconn_vhdl, ERROR_STATE_NONE);
#endif /* EHE_ENABLE */

#if DEBUG && ERROR_DEBUG
    printk( "%s: pcibr_error_handler\n", pcibr_soft->bs_name);
#endif

    ASSERT(pcibr_soft != NULL);

    if (error_code & IOECODE_PIO)
	retval = pcibr_pioerror(pcibr_soft, error_code, mode, ioe);

    if (error_code & IOECODE_DMA) {
	if (error_code & IOECODE_READ) {
	    /*
	     * DMA read error occurs when a device attached to the bridge
	     * tries to read some data from system memory, and this
	     * either results in a timeout or access error.
	     * First case is indicated by the bit "XREAD_REQ_TOUT"
	     * and second case by "RESP_XTALK_ERROR" bit in bridge error
	     * interrupt status register.
	     *
	     * pcibr_error_intr_handler would get invoked first, and it has
	     * the