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-rw-r--r--arch/ia64/sn/kernel/huberror.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/huberror.c b/arch/ia64/sn/kernel/huberror.c
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+++ b/arch/ia64/sn/kernel/huberror.c
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+/*
+ * 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, 2000,2002-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <asm/delay.h>
+#include <asm/sn/sn_sal.h>
+#include "ioerror.h"
+#include <asm/sn/addrs.h>
+#include <asm/sn/shubio.h>
+#include <asm/sn/geo.h>
+#include "xtalk/xwidgetdev.h"
+#include "xtalk/hubdev.h"
+#include <asm/sn/bte.h>
+
+void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
+extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
+ int);
+static irqreturn_t hub_eint_handler(int irq, void *arg, struct pt_regs *ep)
+{
+ struct hubdev_info *hubdev_info;
+ struct ia64_sal_retval ret_stuff;
+ nasid_t nasid;
+
+ ret_stuff.status = 0;
+ ret_stuff.v0 = 0;
+ hubdev_info = (struct hubdev_info *)arg;
+ nasid = hubdev_info->hdi_nasid;
+ SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
+ (u64) nasid, 0, 0, 0, 0, 0, 0);
+
+ if ((int)ret_stuff.v0)
+ panic("hubii_eint_handler(): Fatal TIO Error");
+
+ if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
+ (void)hubiio_crb_error_handler(hubdev_info);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Free the hub CRB "crbnum" which encountered an error.
+ * Assumption is, error handling was successfully done,
+ * and we now want to return the CRB back to Hub for normal usage.
+ *
+ * In order to free the CRB, all that's needed is to de-allocate it
+ *
+ * Assumption:
+ * No other processor is mucking around with the hub control register.
+ * So, upper layer has to single thread this.
+ */
+void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
+{
+ ii_icrb0_b_u_t icrbb;
+
+ /*
+ * The hardware does NOT clear the mark bit, so it must get cleared
+ * here to be sure the error is not processed twice.
+ */
+ icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
+ IIO_ICRB_B(crbnum));
+ icrbb.b_mark = 0;
+ REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
+ icrbb.ii_icrb0_b_regval);
+ /*
+ * Deallocate the register wait till hub indicates it's done.
+ */
+ REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
+ while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
+ udelay(1);
+
+}
+
+/*
+ * hubiio_crb_error_handler
+ *
+ * This routine gets invoked when a hub gets an error
+ * interrupt. So, the routine is running in interrupt context
+ * at error interrupt level.
+ * Action:
+ * It's responsible for identifying ALL the CRBs that are marked
+ * with error, and process them.
+ *
+ * If you find the CRB that's marked with error, map this to the
+ * reason it caused error, and invoke appropriate error handler.
+ *
+ * XXX Be aware of the information in the context register.
+ *
+ * NOTE:
+ * Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
+ * handler can be run on any node. (not necessarily the node
+ * corresponding to the hub that encountered error).
+ */
+
+void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
+{
+ nasid_t nasid;
+ ii_icrb0_a_u_t icrba; /* II CRB Register A */
+ ii_icrb0_b_u_t icrbb; /* II CRB Register B */
+ ii_icrb0_c_u_t icrbc; /* II CRB Register C */
+ ii_icrb0_d_u_t icrbd; /* II CRB Register D */
+ ii_icrb0_e_u_t icrbe; /* II CRB Register D */
+ int i;
+ int num_errors = 0; /* Num of errors handled */
+ ioerror_t ioerror;
+
+ nasid = hubdev_info->hdi_nasid;
+
+ /*
+ * XXX - Add locking for any recovery actions
+ */
+ /*
+ * Scan through all CRBs in the Hub, and handle the errors
+ * in any of the CRBs marked.
+ */
+ for (i = 0; i < IIO_NUM_CRBS; i++) {
+ /* Check this crb entry to see if it is in error. */
+ icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
+
+ if (icrbb.b_mark == 0) {
+ continue;
+ }
+
+ icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
+
+ IOERROR_INIT(&ioerror);
+
+ /* read other CRB error registers. */
+ icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
+ icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
+ icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
+
+ IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
+
+ /* Check if this error is due to BTE operation,
+ * and handle it separately.
+ */
+ if (icrbd.d_bteop ||
+ ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
+ icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
+ (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
+ icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
+
+ int bte_num;
+
+ if (icrbd.d_bteop)
+ bte_num = icrbc.c_btenum;
+ else /* b_initiator bit 2 gives BTE number */
+ bte_num = (icrbb.b_initiator & 0x4) >> 2;
+
+ hubiio_crb_free(hubdev_info, i);
+
+ bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
+ i, &ioerror, icrbd.d_bteop);
+ num_errors++;
+ continue;
+ }
+ }
+}
+
+/*
+ * Function : hub_error_init
+ * Purpose : initialize the error handling requirements for a given hub.
+ * Parameters : cnode, the compact nodeid.
+ * Assumptions : Called only once per hub, either by a local cpu. Or by a
+ * remote cpu, when this hub is headless.(cpuless)
+ * Returns : None
+ */
+void hub_error_init(struct hubdev_info *hubdev_info)
+{
+ if (request_irq(SGI_II_ERROR, (void *)hub_eint_handler, SA_SHIRQ,
+ "SN_hub_error", (void *)hubdev_info))
+ printk("hub_error_init: Failed to request_irq for 0x%p\n",
+ hubdev_info);
+ return;
+}
+
+
+/*
+ * Function : ice_error_init
+ * Purpose : initialize the error handling requirements for a given tio.
+ * Parameters : cnode, the compact nodeid.
+ * Assumptions : Called only once per tio.
+ * Returns : None
+ */
+void ice_error_init(struct hubdev_info *hubdev_info)
+{
+ if (request_irq
+ (SGI_TIO_ERROR, (void *)hub_eint_handler, SA_SHIRQ, "SN_TIO_error",
+ (void *)hubdev_info))
+ printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
+ hubdev_info);
+ return;
+}
+