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) 2000-2007 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 int shub1_bte_error_handler(unsigned long _nodepda)
  37 {
  38         struct nodepda_s *err_nodepda = (struct nodepda_s *)_nodepda;
  39         struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
  40         nasid_t nasid;
  41         int i;
  42         int valid_crbs;
  43         ii_imem_u_t imem;       /* II IMEM Register */
  44         ii_icrb0_d_u_t icrbd;   /* II CRB Register D */
  45         ii_ibcr_u_t ibcr;
  46         ii_icmr_u_t icmr;
  47         ii_ieclr_u_t ieclr;
  48
  49         BTE_PRINTK(("shub1_bte_error_handler(%p) - %d\n", err_nodepda,
  50                     smp_processor_id()));
  51
  52         if ((err_nodepda->bte_if[0].bh_error == BTE_SUCCESS) &&
  53             (err_nodepda->bte_if[1].bh_error == BTE_SUCCESS)) {
  54                 BTE_PRINTK(("eh:%p:%d Nothing to do.\n", err_nodepda,
  55                             smp_processor_id()));
  56                 return 1;
  57         }
  58
  59         /* Determine information about our hub */
  60         nasid = cnodeid_to_nasid(err_nodepda->bte_if[0].bte_cnode);
  61
  62         /*
  63          * A BTE transfer can use multiple CRBs.  We need to make sure
  64          * that all the BTE CRBs are complete (or timed out) before
  65          * attempting to clean up the error.  Resetting the BTE while
  66          * there are still BTE CRBs active will hang the BTE.
  67          * We should look at all the CRBs to see if they are allocated
  68          * to the BTE and see if they are still active.  When none
  69          * are active, we can continue with the cleanup.
  70          *
  71          * We also want to make sure that the local NI port is up.
  72          * When a router resets the NI port can go down, while it
  73          * goes through the LLP handshake, but then comes back up.
  74          */
  75         icmr.ii_icmr_regval = REMOTE_HUB_L(nasid, IIO_ICMR);
  76         if (icmr.ii_icmr_fld_s.i_crb_mark != 0) {
  77                 /*
  78                  * There are errors which still need to be cleaned up by
  79                  * hubiio_crb_error_handler
  80                  */
  81                 mod_timer(recovery_timer, jiffies + (HZ * 5));
  82                 BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
  83                             smp_processor_id()));
  84                 return 1;
  85         }
  86         if (icmr.ii_icmr_fld_s.i_crb_vld != 0) {
  87
  88                 valid_crbs = icmr.ii_icmr_fld_s.i_crb_vld;
  89
  90                 for (i = 0; i < IIO_NUM_CRBS; i++) {
  91                         if (!((1 << i) & valid_crbs)) {
  92                                 /* This crb was not marked as valid, ignore */
  93                                 continue;
  94                         }
  95                         icrbd.ii_icrb0_d_regval =
  96                             REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
  97                         if (icrbd.d_bteop) {
  98                                 mod_timer(recovery_timer, jiffies + (HZ * 5));
  99                                 BTE_PRINTK(("eh:%p:%d Valid %d, Giving up\n",
 100                                             err_nodepda, smp_processor_id(),
 101                                             i));
 102                                 return 1;
 103                         }
 104                 }
 105         }
 106
 107         BTE_PRINTK(("eh:%p:%d Cleaning up\n", err_nodepda, smp_processor_id()));
 108         /* Re-enable both bte interfaces */
 109         imem.ii_imem_regval = REMOTE_HUB_L(nasid, IIO_IMEM);
 110         imem.ii_imem_fld_s.i_b0_esd = imem.ii_imem_fld_s.i_b1_esd = 1;
 111         REMOTE_HUB_S(nasid, IIO_IMEM, imem.ii_imem_regval);
 112
 113         /* Clear BTE0/1 error bits */
 114         ieclr.ii_ieclr_regval = 0;
 115         if (err_nodepda->bte_if[0].bh_error != BTE_SUCCESS)
 116                 ieclr.ii_ieclr_fld_s.i_e_bte_0 = 1;
 117         if (err_nodepda->bte_if[1].bh_error != BTE_SUCCESS)
 118                 ieclr.ii_ieclr_fld_s.i_e_bte_1 = 1;
 119         REMOTE_HUB_S(nasid, IIO_IECLR, ieclr.ii_ieclr_regval);
 120
 121         /* Reinitialize both BTE state machines. */
 122         ibcr.ii_ibcr_regval = REMOTE_HUB_L(nasid, IIO_IBCR);
 123         ibcr.ii_ibcr_fld_s.i_soft_reset = 1;
 124         REMOTE_HUB_S(nasid, IIO_IBCR, ibcr.ii_ibcr_regval);
 125
 126         del_timer(recovery_timer);
 127         return 0;
 128 }
 129
 130 /*
 131  * Wait until all BTE related CRBs are completed
 132  * and then reset the interfaces.
 133  */
 134 int shub2_bte_error_handler(unsigned long _nodepda)
 135 {
 136         struct nodepda_s *err_nodepda = (struct nodepda_s *)_nodepda;
 137         struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
 138         struct bteinfo_s *bte;
 139         nasid_t nasid;
 140         u64 status;
 141         int i;
 142
 143         nasid = cnodeid_to_nasid(err_nodepda->bte_if[0].bte_cnode);
 144
 145         /*
 146          * Verify that all the BTEs are complete
 147          */
 148         for (i = 0; i < BTES_PER_NODE; i++) {
 149                 bte = &err_nodepda->bte_if[i];
 150                 status = BTE_LNSTAT_LOAD(bte);
 151                 if (status & IBLS_ERROR) {
 152                         bte->bh_error = BTE_SHUB2_ERROR(status);
 153                         continue;
 154                 }
 155                 if (!(status & IBLS_BUSY))
 156                         continue;
 157                 mod_timer(recovery_timer, jiffies + (HZ * 5));
 158                 BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
 159                             smp_processor_id()));
 160                 return 1;
 161         }
 162         if (ia64_sn_bte_recovery(nasid))
 163                 panic("bte_error_handler(): Fatal BTE Error");
 164
 165         del_timer(recovery_timer);
 166         return 0;
 167 }
 168
 169 /*
 170  * Wait until all BTE related CRBs are completed
 171  * and then reset the interfaces.
 172  */
 173 void bte_error_handler(unsigned long _nodepda)
 174 {
 175         struct nodepda_s *err_nodepda = (struct nodepda_s *)_nodepda;
 176         spinlock_t *recovery_lock = &err_nodepda->bte_recovery_lock;
 177         int i;
 178         unsigned long irq_flags;
 179         volatile u64 *notify;
 180         bte_result_t bh_error;
 181
 182         BTE_PRINTK(("bte_error_handler(%p) - %d\n", err_nodepda,
 183                     smp_processor_id()));
 184
 185         spin_lock_irqsave(recovery_lock, irq_flags);
 186
 187         /*
 188          * Lock all interfaces on this node to prevent new transfers
 189          * from being queued.
 190          */
 191         for (i = 0; i < BTES_PER_NODE; i++) {
 192                 if (err_nodepda->bte_if[i].cleanup_active) {
 193                         continue;
 194                 }
 195                 spin_lock(&err_nodepda->bte_if[i].spinlock);
 196                 BTE_PRINTK(("eh:%p:%d locked %d\n", err_nodepda,
 197                             smp_processor_id(), i));
 198                 err_nodepda->bte_if[i].cleanup_active = 1;
 199         }
 200
 201         if (is_shub1()) {
 202                 if (shub1_bte_error_handler(_nodepda)) {
 203                         spin_unlock_irqrestore(recovery_lock, irq_flags);
 204                         return;
 205                 }
 206         } else {
 207                 if (shub2_bte_error_handler(_nodepda)) {
 208                         spin_unlock_irqrestore(recovery_lock, irq_flags);
 209                         return;
 210                 }
 211         }
 212
 213         for (i = 0; i < BTES_PER_NODE; i++) {
 214                 bh_error = err_nodepda->bte_if[i].bh_error;
 215                 if (bh_error != BTE_SUCCESS) {
 216                         /* There is an error which needs to be notified */
 217                         notify = err_nodepda->bte_if[i].most_rcnt_na;
 218                         BTE_PRINTK(("cnode %d bte %d error=0x%lx\n",
 219                                     err_nodepda->bte_if[i].bte_cnode,
 220                                     err_nodepda->bte_if[i].bte_num,
 221                                     IBLS_ERROR | (u64) bh_error));
 222                         *notify = IBLS_ERROR | bh_error;
 223                         err_nodepda->bte_if[i].bh_error = BTE_SUCCESS;
 224                 }
 225
 226                 err_nodepda->bte_if[i].cleanup_active = 0;
 227                 BTE_PRINTK(("eh:%p:%d Unlocked %d\n", err_nodepda,
 228                             smp_processor_id(), i));
 229                 spin_unlock(&err_nodepda->bte_if[i].spinlock);
 230         }
 231
 232         spin_unlock_irqrestore(recovery_lock, irq_flags);
 233 }
 234
 235 /*
 236  * First part error handler.  This is called whenever any error CRB interrupt
 237  * is generated by the II.
 238  */
 239 void
 240 bte_crb_error_handler(cnodeid_t cnode, int btenum,
 241                       int crbnum, ioerror_t * ioe, int bteop)
 242 {
 243         struct bteinfo_s *bte;
 244
 245
 246         bte = &(NODEPDA(cnode)->bte_if[btenum]);
 247
 248         /*
 249          * The caller has already figured out the error type, we save that
 250          * in the bte handle structure for the thread exercising the
 251          * interface to consume.
 252          */
 253         bte->bh_error = ioe->ie_errortype + BTEFAIL_OFFSET;
 254         bte->bte_error_count++;
 255
 256         BTE_PRINTK(("Got an error on cnode %d bte %d: HW error type 0x%x\n",
 257                 bte->bte_cnode, bte->bte_num, ioe->ie_errortype));
 258         bte_error_handler((unsigned long) NODEPDA(cnode));
 259 }
 260