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 <<<<<<< HEAD:arch/ia64/sn/kernel/huberror.c
  41                         panic("%s: Fatal %s Error", __FUNCTION__,
  42 =======
  43                         panic("%s: Fatal %s Error", __func__,
  44 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/ia64/sn/kernel/huberror.c
  45                                 ((nasid & 1) ? "TIO" : "HUBII"));
  46
  47                 if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
  48                         (void)hubiio_crb_error_handler(hubdev_info);
  49         } else
  50                 if (nasid & 1) {        /* TIO errors */
  51                         SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
  52                                 (u64) nasid, 0, 0, 0, 0, 0, 0);
  53
  54                         if ((int)ret_stuff.v0)
  55 <<<<<<< HEAD:arch/ia64/sn/kernel/huberror.c
  56                                 panic("%s: Fatal TIO Error", __FUNCTION__);
  57 =======
  58                                 panic("%s: Fatal TIO Error", __func__);
  59 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/ia64/sn/kernel/huberror.c
  60                 } else
  61                         bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));
  62
  63         return IRQ_HANDLED;
  64 }
  65
  66 /*
  67  * Free the hub CRB "crbnum" which encountered an error.
  68  * Assumption is, error handling was successfully done,
  69  * and we now want to return the CRB back to Hub for normal usage.
  70  *
  71  * In order to free the CRB, all that's needed is to de-allocate it
  72  *
  73  * Assumption:
  74  *      No other processor is mucking around with the hub control register.
  75  *      So, upper layer has to single thread this.
  76  */
  77 void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
  78 {
  79         ii_icrb0_b_u_t icrbb;
  80
  81         /*
  82          * The hardware does NOT clear the mark bit, so it must get cleared
  83          * here to be sure the error is not processed twice.
  84          */
  85         icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
  86                                                IIO_ICRB_B(crbnum));
  87         icrbb.b_mark = 0;
  88         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
  89                      icrbb.ii_icrb0_b_regval);
  90         /*
  91          * Deallocate the register wait till hub indicates it's done.
  92          */
  93         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
  94         while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
  95                 cpu_relax();
  96
  97 }
  98
  99 /*
 100  * hubiio_crb_error_handler
 101  *
 102  *      This routine gets invoked when a hub gets an error
 103  *      interrupt. So, the routine is running in interrupt context
 104  *      at error interrupt level.
 105  * Action:
 106  *      It's responsible for identifying ALL the CRBs that are marked
 107  *      with error, and process them.
 108  *
 109  *      If you find the CRB that's marked with error, map this to the
 110  *      reason it caused error, and invoke appropriate error handler.
 111  *
 112  *      XXX Be aware of the information in the context register.
 113  *
 114  * NOTE:
 115  *      Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
 116  *      handler can be run on any node. (not necessarily the node
 117  *      corresponding to the hub that encountered error).
 118  */
 119
 120 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
 121 {
 122         nasid_t nasid;
 123         ii_icrb0_a_u_t icrba;   /* II CRB Register A */
 124         ii_icrb0_b_u_t icrbb;   /* II CRB Register B */
 125         ii_icrb0_c_u_t icrbc;   /* II CRB Register C */
 126         ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
 127         ii_icrb0_e_u_t icrbe;   /* II CRB Register D */
 128         int i;
 129         int num_errors = 0;     /* Num of errors handled */
 130         ioerror_t ioerror;
 131
 132         nasid = hubdev_info->hdi_nasid;
 133
 134         /*
 135          * XXX - Add locking for any recovery actions
 136          */
 137         /*
 138          * Scan through all CRBs in the Hub, and handle the errors
 139          * in any of the CRBs marked.
 140          */
 141         for (i = 0; i < IIO_NUM_CRBS; i++) {
 142                 /* Check this crb entry to see if it is in error. */
 143                 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
 144
 145                 if (icrbb.b_mark == 0) {
 146                         continue;
 147                 }
 148
 149                 icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
 150
 151                 IOERROR_INIT(&ioerror);
 152
 153                 /* read other CRB error registers. */
 154                 icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
 155                 icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
 156                 icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
 157
 158                 IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
 159
 160                 /* Check if this error is due to BTE operation,
 161                  * and handle it separately.
 162                  */
 163                 if (icrbd.d_bteop ||
 164                     ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
 165                       icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
 166                      (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
 167                       icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
 168
 169                         int bte_num;
 170
 171                         if (icrbd.d_bteop)
 172                                 bte_num = icrbc.c_btenum;
 173                         else    /* b_initiator bit 2 gives BTE number */
 174                                 bte_num = (icrbb.b_initiator & 0x4) >> 2;
 175
 176                         hubiio_crb_free(hubdev_info, i);
 177
 178                         bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
 179                                               i, &ioerror, icrbd.d_bteop);
 180                         num_errors++;
 181                         continue;
 182                 }
 183         }
 184 }
 185
 186 /*
 187  * Function     : hub_error_init
 188  * Purpose      : initialize the error handling requirements for a given hub.
 189  * Parameters   : cnode, the compact nodeid.
 190  * Assumptions  : Called only once per hub, either by a local cpu. Or by a
 191  *                      remote cpu, when this hub is headless.(cpuless)
 192  * Returns      : None
 193  */
 194 void hub_error_init(struct hubdev_info *hubdev_info)
 195 {
 196
 197         if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
 198                         "SN_hub_error", (void *)hubdev_info)) {
 199                 printk("hub_error_init: Failed to request_irq for 0x%p\n",
 200                     hubdev_info);
 201                 return;
 202         }
 203         sn_set_err_irq_affinity(SGI_II_ERROR);
 204 }
 205
 206
 207 /*
 208  * Function     : ice_error_init
 209  * Purpose      : initialize the error handling requirements for a given tio.
 210  * Parameters   : cnode, the compact nodeid.
 211  * Assumptions  : Called only once per tio.
 212  * Returns      : None
 213  */
 214 void ice_error_init(struct hubdev_info *hubdev_info)
 215 {
 216
 217         if (request_irq
 218             (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
 219              (void *)hubdev_info)) {
 220                 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
 221                        hubdev_info);
 222                 return;
 223         }
 224         sn_set_err_irq_affinity(SGI_TIO_ERROR);
 225 }
 226