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, 2000,2002-2005 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/pci.h>
  12 #include <asm/delay.h>
  13 #include <asm/sn/sn_sal.h>
  14 #include "ioerror.h"
  15 #include <asm/sn/addrs.h>
  16 #include <asm/sn/shubio.h>
  17 #include <asm/sn/geo.h>
  18 #include "xtalk/xwidgetdev.h"
  19 #include "xtalk/hubdev.h"
  20 #include <asm/sn/bte.h>
  21
  22 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
  23 extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
  24                                   int);
  25 static irqreturn_t hub_eint_handler(int irq, void *arg)
  26 {
  27         struct hubdev_info *hubdev_info;
  28         struct ia64_sal_retval ret_stuff;
  29         nasid_t nasid;
  30
  31         ret_stuff.status = 0;
  32         ret_stuff.v0 = 0;
  33         hubdev_info = (struct hubdev_info *)arg;
  34         nasid = hubdev_info->hdi_nasid;
  35
  36         if (is_shub1()) {
  37                 SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
  38                         (u64) nasid, 0, 0, 0, 0, 0, 0);
  39
  40                 if ((int)ret_stuff.v0)
  41                         panic("hubii_eint_handler(): Fatal TIO Error");
  42
  43                 if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
  44                         (void)hubiio_crb_error_handler(hubdev_info);
  45         } else
  46                 bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));
  47
  48         return IRQ_HANDLED;
  49 }
  50
  51 /*
  52  * Free the hub CRB "crbnum" which encountered an error.
  53  * Assumption is, error handling was successfully done,
  54  * and we now want to return the CRB back to Hub for normal usage.
  55  *
  56  * In order to free the CRB, all that's needed is to de-allocate it
  57  *
  58  * Assumption:
  59  *      No other processor is mucking around with the hub control register.
  60  *      So, upper layer has to single thread this.
  61  */
  62 void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
  63 {
  64         ii_icrb0_b_u_t icrbb;
  65
  66         /*
  67          * The hardware does NOT clear the mark bit, so it must get cleared
  68          * here to be sure the error is not processed twice.
  69          */
  70         icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
  71                                                IIO_ICRB_B(crbnum));
  72         icrbb.b_mark = 0;
  73         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
  74                      icrbb.ii_icrb0_b_regval);
  75         /*
  76          * Deallocate the register wait till hub indicates it's done.
  77          */
  78         REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
  79         while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
  80                 cpu_relax();
  81
  82 }
  83
  84 /*
  85  * hubiio_crb_error_handler
  86  *
  87  *      This routine gets invoked when a hub gets an error
  88  *      interrupt. So, the routine is running in interrupt context
  89  *      at error interrupt level.
  90  * Action:
  91  *      It's responsible for identifying ALL the CRBs that are marked
  92  *      with error, and process them.
  93  *
  94  *      If you find the CRB that's marked with error, map this to the
  95  *      reason it caused error, and invoke appropriate error handler.
  96  *
  97  *      XXX Be aware of the information in the context register.
  98  *
  99  * NOTE:
 100  *      Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
 101  *      handler can be run on any node. (not necessarily the node
 102  *      corresponding to the hub that encountered error).
 103  */
 104
 105 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
 106 {
 107         nasid_t nasid;
 108         ii_icrb0_a_u_t icrba;   /* II CRB Register A */
 109         ii_icrb0_b_u_t icrbb;   /* II CRB Register B */
 110         ii_icrb0_c_u_t icrbc;   /* II CRB Register C */
 111         ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
 112         ii_icrb0_e_u_t icrbe;   /* II CRB Register D */
 113         int i;
 114         int num_errors = 0;     /* Num of errors handled */
 115         ioerror_t ioerror;
 116
 117         nasid = hubdev_info->hdi_nasid;
 118
 119         /*
 120          * XXX - Add locking for any recovery actions
 121          */
 122         /*
 123          * Scan through all CRBs in the Hub, and handle the errors
 124          * in any of the CRBs marked.
 125          */
 126         for (i = 0; i < IIO_NUM_CRBS; i++) {
 127                 /* Check this crb entry to see if it is in error. */
 128                 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
 129
 130                 if (icrbb.b_mark == 0) {
 131                         continue;
 132                 }
 133
 134                 icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
 135
 136                 IOERROR_INIT(&ioerror);
 137
 138                 /* read other CRB error registers. */
 139                 icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
 140                 icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
 141                 icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
 142
 143                 IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
 144
 145                 /* Check if this error is due to BTE operation,
 146                  * and handle it separately.
 147                  */
 148                 if (icrbd.d_bteop ||
 149                     ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
 150                       icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
 151                      (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
 152                       icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
 153
 154                         int bte_num;
 155
 156                         if (icrbd.d_bteop)
 157                                 bte_num = icrbc.c_btenum;
 158                         else    /* b_initiator bit 2 gives BTE number */
 159                                 bte_num = (icrbb.b_initiator & 0x4) >> 2;
 160
 161                         hubiio_crb_free(hubdev_info, i);
 162
 163                         bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
 164                                               i, &ioerror, icrbd.d_bteop);
 165                         num_errors++;
 166                         continue;
 167                 }
 168         }
 169 }
 170
 171 /*
 172  * Function     : hub_error_init
 173  * Purpose      : initialize the error handling requirements for a given hub.
 174  * Parameters   : cnode, the compact nodeid.
 175  * Assumptions  : Called only once per hub, either by a local cpu. Or by a
 176  *                      remote cpu, when this hub is headless.(cpuless)
 177  * Returns      : None
 178  */
 179 void hub_error_init(struct hubdev_info *hubdev_info)
 180 {
 181         if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
 182                         "SN_hub_error", (void *)hubdev_info))
 183                 printk("hub_error_init: Failed to request_irq for 0x%p\n",
 184                     hubdev_info);
 185         return;
 186 }
 187
 188
 189 /*
 190  * Function     : ice_error_init
 191  * Purpose      : initialize the error handling requirements for a given tio.
 192  * Parameters   : cnode, the compact nodeid.
 193  * Assumptions  : Called only once per tio.
 194  * Returns      : None
 195  */
 196 void ice_error_init(struct hubdev_info *hubdev_info)
 197 {
 198         if (request_irq
 199             (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
 200              (void *)hubdev_info))
 201                 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
 202                        hubdev_info);
 203         return;
 204 }
 205