221 lines
6.3 KiB
C
221 lines
6.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1992 - 1997, 2000,2002-2007 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <asm/delay.h>
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#include <asm/sn/sn_sal.h>
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#include "ioerror.h"
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#include <asm/sn/addrs.h>
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#include <asm/sn/shubio.h>
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#include <asm/sn/geo.h>
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#include "xtalk/xwidgetdev.h"
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#include "xtalk/hubdev.h"
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#include <asm/sn/bte.h>
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void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
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extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
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int);
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static irqreturn_t hub_eint_handler(int irq, void *arg)
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{
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struct hubdev_info *hubdev_info;
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struct ia64_sal_retval ret_stuff;
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nasid_t nasid;
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ret_stuff.status = 0;
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ret_stuff.v0 = 0;
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hubdev_info = (struct hubdev_info *)arg;
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nasid = hubdev_info->hdi_nasid;
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if (is_shub1()) {
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SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
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(u64) nasid, 0, 0, 0, 0, 0, 0);
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if ((int)ret_stuff.v0)
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panic("%s: Fatal %s Error", __func__,
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((nasid & 1) ? "TIO" : "HUBII"));
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if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
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(void)hubiio_crb_error_handler(hubdev_info);
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} else
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if (nasid & 1) { /* TIO errors */
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SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
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(u64) nasid, 0, 0, 0, 0, 0, 0);
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if ((int)ret_stuff.v0)
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panic("%s: Fatal TIO Error", __func__);
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} else
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bte_error_handler(NODEPDA(nasid_to_cnodeid(nasid)));
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return IRQ_HANDLED;
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}
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/*
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* Free the hub CRB "crbnum" which encountered an error.
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* Assumption is, error handling was successfully done,
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* and we now want to return the CRB back to Hub for normal usage.
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*
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* In order to free the CRB, all that's needed is to de-allocate it
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*
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* Assumption:
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* No other processor is mucking around with the hub control register.
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* So, upper layer has to single thread this.
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*/
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void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
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{
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ii_icrb0_b_u_t icrbb;
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/*
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* The hardware does NOT clear the mark bit, so it must get cleared
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* here to be sure the error is not processed twice.
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*/
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icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
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IIO_ICRB_B(crbnum));
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icrbb.b_mark = 0;
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REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
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icrbb.ii_icrb0_b_regval);
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/*
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* Deallocate the register wait till hub indicates it's done.
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*/
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REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
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while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
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cpu_relax();
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}
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/*
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* hubiio_crb_error_handler
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*
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* This routine gets invoked when a hub gets an error
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* interrupt. So, the routine is running in interrupt context
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* at error interrupt level.
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* Action:
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* It's responsible for identifying ALL the CRBs that are marked
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* with error, and process them.
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*
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* If you find the CRB that's marked with error, map this to the
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* reason it caused error, and invoke appropriate error handler.
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*
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* XXX Be aware of the information in the context register.
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*
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* NOTE:
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* Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
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* handler can be run on any node. (not necessarily the node
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* corresponding to the hub that encountered error).
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*/
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void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
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{
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nasid_t nasid;
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ii_icrb0_a_u_t icrba; /* II CRB Register A */
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ii_icrb0_b_u_t icrbb; /* II CRB Register B */
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ii_icrb0_c_u_t icrbc; /* II CRB Register C */
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ii_icrb0_d_u_t icrbd; /* II CRB Register D */
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ii_icrb0_e_u_t icrbe; /* II CRB Register D */
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int i;
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int num_errors = 0; /* Num of errors handled */
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ioerror_t ioerror;
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nasid = hubdev_info->hdi_nasid;
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/*
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* XXX - Add locking for any recovery actions
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*/
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/*
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* Scan through all CRBs in the Hub, and handle the errors
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* in any of the CRBs marked.
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*/
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for (i = 0; i < IIO_NUM_CRBS; i++) {
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/* Check this crb entry to see if it is in error. */
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icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
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if (icrbb.b_mark == 0) {
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continue;
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}
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icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
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IOERROR_INIT(&ioerror);
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/* read other CRB error registers. */
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icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
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icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
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icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
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IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
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/* Check if this error is due to BTE operation,
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* and handle it separately.
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*/
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if (icrbd.d_bteop ||
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((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
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icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
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(icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
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icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
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int bte_num;
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if (icrbd.d_bteop)
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bte_num = icrbc.c_btenum;
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else /* b_initiator bit 2 gives BTE number */
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bte_num = (icrbb.b_initiator & 0x4) >> 2;
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hubiio_crb_free(hubdev_info, i);
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bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
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i, &ioerror, icrbd.d_bteop);
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num_errors++;
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continue;
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}
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}
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}
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/*
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* Function : hub_error_init
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* Purpose : initialize the error handling requirements for a given hub.
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* Parameters : cnode, the compact nodeid.
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* Assumptions : Called only once per hub, either by a local cpu. Or by a
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* remote cpu, when this hub is headless.(cpuless)
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* Returns : None
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*/
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void hub_error_init(struct hubdev_info *hubdev_info)
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{
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if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
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"SN_hub_error", hubdev_info)) {
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printk(KERN_ERR "hub_error_init: Failed to request_irq for 0x%p\n",
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hubdev_info);
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return;
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}
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irq_set_handler(SGI_II_ERROR, handle_level_irq);
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sn_set_err_irq_affinity(SGI_II_ERROR);
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}
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/*
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* Function : ice_error_init
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* Purpose : initialize the error handling requirements for a given tio.
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* Parameters : cnode, the compact nodeid.
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* Assumptions : Called only once per tio.
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* Returns : None
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*/
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void ice_error_init(struct hubdev_info *hubdev_info)
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{
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if (request_irq
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(SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
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(void *)hubdev_info)) {
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printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
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hubdev_info);
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return;
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}
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irq_set_handler(SGI_TIO_ERROR, handle_level_irq);
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sn_set_err_irq_affinity(SGI_TIO_ERROR);
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}
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