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/* $Id: bte_error.c,v 1.1 2002/02/28 17:31:25 marcelo Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1992 - 1997, 2000,2002 Silicon Graphics, Inc. All rights reserved.
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <asm/smp.h>
#include <asm/sn/sgi.h>
#include <asm/sn/io.h>
#include <asm/sn/iograph.h>
#include <asm/sn/invent.h>
#include <asm/sn/hcl.h>
#include <asm/sn/labelcl.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/pci/pciio.h>
#include <asm/sn/pci/pcibr.h>
#include <asm/sn/xtalk/xtalk.h>
#include <asm/sn/pci/pcibr_private.h>
#include <asm/sn/intr.h>
#include <asm/sn/ioerror.h>
#include <asm/sn/sn2/shubio.h>
#include <asm/sn/bte.h>
/************************************************************************
* *
* BTE ERROR RECOVERY *
* *
* Given a BTE error, the node causing the error must do the following: *
* a) Clear all crbs relating to that BTE *
* 1) Read CRBA value for crb in question *
* 2) Mark CRB as VALID, store local physical *
* address known to be good in the address field *
* (bte_notification_targ is a known good local *
* address). *
* 3) Write CRBA *
* 4) Using ICCR, FLUSH the CRB, and wait for it to *
* complete. *
* ... BTE BUSY bit should now be clear (or at least *
* should be after ALL CRBs associated with the *
* transfer are complete. *
* *
* b) Re-enable BTE *
* 1) Write IMEM with BTE Enable + XXX bits
* 2) Write IECLR with BTE clear bits
* 3) Clear IIDSR INT_SENT bits.
* *
************************************************************************/
/*
* >>> bte_crb_error_handler needs to be broken into two parts. The
* first should cleanup the CRB. The second should wait until all bte
* related CRB's are complete and then do the error reset.
*/
void
bte_crb_error_handler(devfs_handle_t hub_v, int btenum,
int crbnum, ioerror_t *ioe, int bteop)
/*
* Function: bte_crb_error_handler
* Purpose: Process a CRB for a specific HUB/BTE
* Parameters: hub_v - vertex of hub in HW graph
* btenum - bte number on hub (0 == a, 1 == b)
* crbnum - crb number being processed
* Notes:
* This routine assumes serialization at a higher level. A CRB
* should not be processed more than once. The error recovery
* follows the following sequence - if you change this, be real
* sure about what you are doing.
*
*/
{
hubinfo_t hinfo;
icrba_t crba;
icrbb_t crbb;
nasid_t n;
hubreg_t iidsr, imem, ieclr;
hubinfo_get(hub_v, &hinfo);
n = hinfo->h_nasid;
/*
* The following 10 lines (or so) are adapted from IRIXs
* bte_crb_error function. No clear documentation tells
* why the crb needs to complete normally in order for
* the BTE to resume normal operations. This first step
* appears vital!
*/
/*
* Zero error and error code to prevent error_dump complaining
* about these CRBs. Copy the CRB to the notification line.
* The crb address is in shub format (physical address shifted
* right by cacheline size).
*/
crbb.ii_icrb0_b_regval = REMOTE_HUB_L(n, IIO_ICRB_B(crbnum));
crbb.b_error=0;
crbb.b_ecode=0;
REMOTE_HUB_S(n, IIO_ICRB_B(crbnum), crbb.ii_icrb0_b_regval);
crba.ii_icrb0_a_regval = REMOTE_HUB_L(n, IIO_ICRB_A(crbnum));
crba.a_addr = TO_PHYS((u64)&nodepda->bte_if[btenum].notify) >> 3;
crba.a_valid = 1;
REMOTE_HUB_S(n, IIO_ICRB_A(crbnum), crba.ii_icrb0_a_regval);
REMOTE_HUB_S(n, IIO_ICCR,
IIO_ICCR_PENDING | IIO_ICCR_CMD_FLUSH | crbnum);
while (REMOTE_HUB_L(n, IIO_ICCR) & IIO_ICCR_PENDING)
;
/* Terminate the BTE. */
/* >>> The other bte transfer will need to be restarted. */
HUB_L((shubreg_t *)((nodepda->bte_if[btenum].bte_base_addr +
IIO_IBCT0 - IIO_IBLS0)));
imem = REMOTE_HUB_L(n, IIO_IMEM);
ieclr = REMOTE_HUB_L(n, IIO_IECLR);
if (btenum == 0) {
imem |= IIO_IMEM_W0ESD | IIO_IMEM_B0ESD;
ieclr|= IECLR_BTE0;
} else {
imem |= IIO_IMEM_W0ESD | IIO_IMEM_B1ESD;
ieclr|= IECLR_BTE1;
}
REMOTE_HUB_S(n, IIO_IMEM, imem);
REMOTE_HUB_S(n, IIO_IECLR, ieclr);
iidsr = REMOTE_HUB_L(n, IIO_IIDSR);
iidsr &= ~IIO_IIDSR_SENT_MASK;
iidsr |= IIO_IIDSR_ENB_MASK;
REMOTE_HUB_S(n, IIO_IIDSR, iidsr);
bte_reset_nasid(n);
*nodepda->bte_if[btenum].most_rcnt_na = IBLS_ERROR;
}
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