arch/ia64/sn/kernel/bte_error.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) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <asm/sn/sn_sal.h>
  11 #include "ioerror.h"
  12 #include <asm/sn/addrs.h>
  13 #include <asm/sn/shubio.h>
  14 #include <asm/sn/geo.h>
  15 #include "xtalk/xwidgetdev.h"
  16 #include "xtalk/hubdev.h"
  17 #include <asm/sn/bte.h>
  18 #include <asm/param.h>
  19
  20 /*
  21  * Bte error handling is done in two parts.  The first captures
  22  * any crb related errors.  Since there can be multiple crbs per
  23  * interface and multiple interfaces active, we need to wait until
  24  * all active crbs are completed.  This is the first job of the
  25  * second part error handler.  When all bte related CRBs are cleanly
  26  * completed, it resets the interfaces and gets them ready for new
  27  * transfers to be queued.
  28  */
  29
  30 void bte_error_handler(unsigned long);
  31
  32 /*
  33  * Wait until all BTE related CRBs are completed
  34  * and then reset the interfaces.
  35  */
  36 void bte_error_handler(unsigned long _nodepda)
  37 {
  38         struct nodepda_s *err_nodepda = (struct nodepda_s *)_nodepda;
  39         spinlock_t *recovery_lock = &err_nodepda->bte_recovery_lock;
  40         struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
  41         nasid_t nasid;
  42         int i;
  43         int valid_crbs;
  44         unsigned long irq_flags;
  45         volatile u64 *notify;
  46         bte_result_t bh_error;
  47         ii_imem_u_t imem;       /* II IMEM Register */
  48         ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
  49         ii_ibcr_u_t ibcr;
  50         ii_icmr_u_t icmr;
  51         ii_ieclr_u_t ieclr;
  52
  53         BTE_PRINTK(("bte_error_handler(%p) - %d\n", err_nodepda,
  54                     smp_processor_id()));
  55
  56         spin_lock_irqsave(recovery_lock, irq_flags);
  57
  58         if ((err_nodepda->bte_if[0].bh_error == BTE_SUCCESS) &&
  59             (err_nodepda->bte_if[1].bh_error == BTE_SUCCESS)) {
  60                 BTE_PRINTK(("eh:%p:%d Nothing to do.\n", err_nodepda,
  61                             smp_processor_id()));
  62                 spin_unlock_irqrestore(recovery_lock, irq_flags);
  63                 return;
  64         }
  65         /*
  66          * Lock all interfaces on this node to prevent new transfers
  67          * from being queued.
  68          */
  69         for (i = 0; i < BTES_PER_NODE; i++) {
  70                 if (err_nodepda->bte_if[i].cleanup_active) {
  71                         continue;
  72                 }
  73                 spin_lock(&err_nodepda->bte_if[i].spinlock);
  74                 BTE_PRINTK(("eh:%p:%d locked %d\n", err_nodepda,
  75                             smp_processor_id(), i));
  76                 err_nodepda->bte_if[i].cleanup_active = 1;
  77         }
  78
  79         /* Determine information about our hub */
  80         nasid = cnodeid_to_nasid(err_nodepda->bte_if[0].bte_cnode);
  81
  82         /*
  83          * A BTE transfer can use multiple CRBs.  We need to make sure
  84          * that all the BTE CRBs are complete (or timed out) before
  85          * attempting to clean up the error.  Resetting the BTE while
  86          * there are still BTE CRBs active will hang the BTE.
  87          * We should look at all the CRBs to see if they are allocated
  88          * to the BTE and see if they are still active.  When none
  89          * are active, we can continue with the cleanup.
  90          *
  91          * We also want to make sure that the local NI port is up.
  92          * When a router resets the NI port can go down, while it
  93          * goes through the LLP handshake, but then comes back up.
  94          */
  95         icmr.ii_icmr_regval = REMOTE_HUB_L(nasid, IIO_ICMR);
  96         if (icmr.ii_icmr_fld_s.i_crb_mark != 0) {
  97                 /*
  98                  * There are errors which still need to be cleaned up by
  99                  * hubiio_crb_error_handler
 100                  */
 101                 mod_timer(recovery_timer, HZ * 5);
 102                 BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
 103                             smp_processor_id()));
 104                 spin_unlock_irqrestore(recovery_lock, irq_flags);
 105                 return;
 106         }
 107         if (icmr.ii_icmr_fld_s.i_crb_vld != 0) {
 108
 109                 valid_crbs = icmr.ii_icmr_fld_s.i_crb_vld;
 110
 111                 for (i = 0; i < IIO_NUM_CRBS; i++) {
 112                         if (!((1 << i) & valid_crbs)) {
 113                                 /* This crb was not marked as valid, ignore */
 114                                 continue;
 115                         }
 116                         icrbd.ii_icrb0_d_regval =
 117                             REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
 118                         if (icrbd.d_bteop) {
 119                                 mod_timer(recovery_timer, HZ * 5);
 120                                 BTE_PRINTK(("eh:%p:%d Valid %d, Giving up\n",
 121                                             err_nodepda, smp_processor_id(),
 122                                             i));
 123                                 spin_unlock_irqrestore(recovery_lock,
 124                                                        irq_flags);
 125                                 return;
 126                         }
 127                 }
 128         }
 129
 130         BTE_PRINTK(("eh:%p:%d Cleaning up\n", err_nodepda, smp_processor_id()));
 131         /* Reenable both bte interfaces */
 132         imem.ii_imem_regval = REMOTE_HUB_L(nasid, IIO_IMEM);
 133         imem.ii_imem_fld_s.i_b0_esd = imem.ii_imem_fld_s.i_b1_esd = 1;
 134         REMOTE_HUB_S(nasid, IIO_IMEM, imem.ii_imem_regval);
 135
 136         /* Clear BTE0/1 error bits */
 137         ieclr.ii_ieclr_regval = 0;
 138         if (err_nodepda->bte_if[0].bh_error != BTE_SUCCESS)
 139                 ieclr.ii_ieclr_fld_s.i_e_bte_0 = 1;
 140         if (err_nodepda->bte_if[1].bh_error != BTE_SUCCESS)
 141                 ieclr.ii_ieclr_fld_s.i_e_bte_1 = 1;
 142         REMOTE_HUB_S(nasid, IIO_IECLR, ieclr.ii_ieclr_regval);
 143
 144         /* Reinitialize both BTE state machines. */
 145         ibcr.ii_ibcr_regval = REMOTE_HUB_L(nasid, IIO_IBCR);
 146         ibcr.ii_ibcr_fld_s.i_soft_reset = 1;
 147         REMOTE_HUB_S(nasid, IIO_IBCR, ibcr.ii_ibcr_regval);
 148
 149         for (i = 0; i < BTES_PER_NODE; i++) {
 150                 bh_error = err_nodepda->bte_if[i].bh_error;
 151                 if (bh_error != BTE_SUCCESS) {
 152                         /* There is an error which needs to be notified */
 153                         notify = err_nodepda->bte_if[i].most_rcnt_na;
 154                         BTE_PRINTK(("cnode %d bte %d error=0x%lx\n",
 155                                     err_nodepda->bte_if[i].bte_cnode,
 156                                     err_nodepda->bte_if[i].bte_num,
 157                                     IBLS_ERROR | (u64) bh_error));
 158                         *notify = IBLS_ERROR | bh_error;
 159                         err_nodepda->bte_if[i].bh_error = BTE_SUCCESS;
 160                 }
 161
 162                 err_nodepda->bte_if[i].cleanup_active = 0;
 163                 BTE_PRINTK(("eh:%p:%d Unlocked %d\n", err_nodepda,
 164                             smp_processor_id(), i));
 165                 spin_unlock(&err_nodepda->bte_if[i].spinlock);
 166         }
 167
 168         del_timer(recovery_timer);
 169
 170         spin_unlock_irqrestore(recovery_lock, irq_flags);
 171 }
 172
 173 /*
 174  * First part error handler.  This is called whenever any error CRB interrupt
 175  * is generated by the II.
 176  */
 177 void
 178 bte_crb_error_handler(cnodeid_t cnode, int btenum,
 179                       int crbnum, ioerror_t * ioe, int bteop)
 180 {
 181         struct bteinfo_s *bte;
 182
 183
 184         bte = &(NODEPDA(cnode)->bte_if[btenum]);
 185
 186         /*
 187          * The caller has already figured out the error type, we save that
 188          * in the bte handle structure for the thread excercising the
 189          * interface to consume.
 190          */
 191         bte->bh_error = ioe->ie_errortype + BTEFAIL_OFFSET;
 192         bte->bte_error_count++;
 193
 194         BTE_PRINTK(("Got an error on cnode %d bte %d: HW error type 0x%x\n",
 195                 bte->bte_cnode, bte->bte_num, ioe->ie_errortype));
 196         bte_error_handler((unsigned long) NODEPDA(cnode));
 197 }
 198