arch/ia64/sn/kernel/huberror.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1992 - 1997, 2000,2002-2007 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <asm/delay.h>
  12 #include <asm/sn/sn_sal.h>
  13 #include "ioerror.h"
  14 #include <asm/sn/addrs.h>
  15 #include <asm/sn/shubio.h>
  16 #include <asm/sn/geo.h>
  17 #include "xtalk/xwidgetdev.h"
  18 #include "xtalk/hubdev.h"
  19 #include <asm/sn/bte.h>
  20
  21 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
  22 extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
  23                                   int);
  24 static irqreturn_t hub_eint_handler(int irq, void *arg)
  25 {
  26         struct hubdev_info *hubdev_info;
  27         struct ia64_sal_retval ret_stuff;
  28         nasid_t nasid;
  29
  30         ret_stuff.status = 0;
  31         ret_stuff.v0 = 0;
  32         hubdev_info = (struct hubdev_info *)arg;
  33         nasid = hubdev_info->hdi_nasid;
  34
  35         if (is_shub1()) {
  36                 SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
  37                         (u64) nasid, 0, 0, 0, 0, 0, 0);
  38
  39                 if ((int)ret_stuff.v0)
  40                         panic("%s: Fatal %s Error", __FUNCTION__,
  41                                 ((nasid & 1) ? "TIO" : "HUBII"));
  42
  43                 if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
  44                         (void)hubiio_crb_error_handler(hubdev_info);
  45         } else
  46                 if (nasid & 1) {        /* TIO errors */
  47                         SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
  48                                 (u64) nasid, 0, 0, 0, 0, 0, 0);
  49
  50                         if ((int)ret_stuff.v0)
  51                                 panic("%s: Fatal TIO Error", __FUNCTION__);
  52                 } else
  53                         bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 /*
  59  * Free the hub CRB "crbnum" which encountered an error.
  60  * Assumption is, error handling was successfully done,
  61  * and we now want to return the CRB back to Hub for normal usage.
  62  *
  63  * In order to free the CRB, all that's needed is to de-allocate it
  64  *
  65  * Assumption:
  66  *      No other processor is mucking around with the hub control register.
  67  *      So, upper layer has to single thread this.
  68  */
  69 void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
  70 {
  71         ii_icrb0_b_u_t icrbb;
  72
  73         /*
  74          * The hardware does NOT clear the mark bit, so it must get cleared
  75          * here to be sure the error is not processed twice.
  76          */
  77         icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
  78                                                IIO_ICRB_B(crbnum));
  79         icrbb.b_mark = 0;
  80         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
  81                      icrbb.ii_icrb0_b_regval);
  82         /*
  83          * Deallocate the register wait till hub indicates it's done.
  84          */
  85         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
  86         while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
  87                 cpu_relax();
  88
  89 }
  90
  91 /*
  92  * hubiio_crb_error_handler
  93  *
  94  *      This routine gets invoked when a hub gets an error
  95  *      interrupt. So, the routine is running in interrupt context
  96  *      at error interrupt level.
  97  * Action:
  98  *      It's responsible for identifying ALL the CRBs that are marked
  99  *      with error, and process them.
 100  *
 101  *      If you find the CRB that's marked with error, map this to the
 102  *      reason it caused error, and invoke appropriate error handler.
 103  *
 104  *      XXX Be aware of the information in the context register.
 105  *
 106  * NOTE:
 107  *      Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
 108  *      handler can be run on any node. (not necessarily the node
 109  *      corresponding to the hub that encountered error).
 110  */
 111
 112 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
 113 {
 114         nasid_t nasid;
 115         ii_icrb0_a_u_t icrba;   /* II CRB Register A */
 116         ii_icrb0_b_u_t icrbb;   /* II CRB Register B */
 117         ii_icrb0_c_u_t icrbc;   /* II CRB Register C */
 118         ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
 119         ii_icrb0_e_u_t icrbe;   /* II CRB Register D */
 120         int i;
 121         int num_errors = 0;     /* Num of errors handled */
 122         ioerror_t ioerror;
 123
 124         nasid = hubdev_info->hdi_nasid;
 125
 126         /*
 127          * XXX - Add locking for any recovery actions
 128          */
 129         /*
 130          * Scan through all CRBs in the Hub, and handle the errors
 131          * in any of the CRBs marked.
 132          */
 133         for (i = 0; i < IIO_NUM_CRBS; i++) {
 134                 /* Check this crb entry to see if it is in error. */
 135                 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
 136
 137                 if (icrbb.b_mark == 0) {
 138                         continue;
 139                 }
 140
 141                 icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
 142
 143                 IOERROR_INIT(&ioerror);
 144
 145                 /* read other CRB error registers. */
 146                 icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
 147                 icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
 148                 icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
 149
 150                 IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
 151
 152                 /* Check if this error is due to BTE operation,
 153                  * and handle it separately.
 154                  */
 155                 if (icrbd.d_bteop ||
 156                     ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
 157                       icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
 158                      (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
 159                       icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
 160
 161                         int bte_num;
 162
 163                         if (icrbd.d_bteop)
 164                                 bte_num = icrbc.c_btenum;
 165                         else    /* b_initiator bit 2 gives BTE number */
 166                                 bte_num = (icrbb.b_initiator & 0x4) >> 2;
 167
 168                         hubiio_crb_free(hubdev_info, i);
 169
 170                         bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
 171                                               i, &ioerror, icrbd.d_bteop);
 172                         num_errors++;
 173                         continue;
 174                 }
 175         }
 176 }
 177
 178 /*
 179  * Function     : hub_error_init
 180  * Purpose      : initialize the error handling requirements for a given hub.
 181  * Parameters   : cnode, the compact nodeid.
 182  * Assumptions  : Called only once per hub, either by a local cpu. Or by a
 183  *                      remote cpu, when this hub is headless.(cpuless)
 184  * Returns      : None
 185  */
 186 void hub_error_init(struct hubdev_info *hubdev_info)
 187 {
 188         if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
 189                         "SN_hub_error", (void *)hubdev_info))
 190                 printk("hub_error_init: Failed to request_irq for 0x%p\n",
 191                     hubdev_info);
 192         return;
 193 }
 194
 195
 196 /*
 197  * Function     : ice_error_init
 198  * Purpose      : initialize the error handling requirements for a given tio.
 199  * Parameters   : cnode, the compact nodeid.
 200  * Assumptions  : Called only once per tio.
 201  * Returns      : None
 202  */
 203 void ice_error_init(struct hubdev_info *hubdev_info)
 204 {
 205         if (request_irq
 206             (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
 207              (void *)hubdev_info))
 208                 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
 209                        hubdev_info);
 210         return;
 211 }
 212