drivers/infiniband/hw/ipath/ipath_intr.c

   1 /*
   2  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/pci.h>
  34
  35 #include "ipath_kernel.h"
  36 #include "ips_common.h"
  37 #include "ipath_layer.h"
  38
  39 #define E_SUM_PKTERRS \
  40         (INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
  41          INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
  42          INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
  43          INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
  44          INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
  45          INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
  46
  47 #define E_SUM_ERRS \
  48         (INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
  49          INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
  50          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
  51          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
  52          INFINIPATH_E_INVALIDADDR)
  53
  54 static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
  55 {
  56         unsigned long sbuf[4];
  57         u64 ignore_this_time = 0;
  58         u32 piobcnt;
  59
  60         /* if possible that sendbuffererror could be valid */
  61         piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
  62         /* read these before writing errorclear */
  63         sbuf[0] = ipath_read_kreg64(
  64                 dd, dd->ipath_kregs->kr_sendbuffererror);
  65         sbuf[1] = ipath_read_kreg64(
  66                 dd, dd->ipath_kregs->kr_sendbuffererror + 1);
  67         if (piobcnt > 128) {
  68                 sbuf[2] = ipath_read_kreg64(
  69                         dd, dd->ipath_kregs->kr_sendbuffererror + 2);
  70                 sbuf[3] = ipath_read_kreg64(
  71                         dd, dd->ipath_kregs->kr_sendbuffererror + 3);
  72         }
  73
  74         if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
  75                 int i;
  76
  77                 ipath_cdbg(PKT, "SendbufErrs %lx %lx ", sbuf[0], sbuf[1]);
  78                 if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
  79                         printk("%lx %lx ", sbuf[2], sbuf[3]);
  80                 for (i = 0; i < piobcnt; i++) {
  81                         if (test_bit(i, sbuf)) {
  82                                 u32 __iomem *piobuf;
  83                                 if (i < dd->ipath_piobcnt2k)
  84                                         piobuf = (u32 __iomem *)
  85                                                 (dd->ipath_pio2kbase +
  86                                                  i * dd->ipath_palign);
  87                                 else
  88                                         piobuf = (u32 __iomem *)
  89                                                 (dd->ipath_pio4kbase +
  90                                                  (i - dd->ipath_piobcnt2k) *
  91                                                  dd->ipath_4kalign);
  92
  93                                 ipath_cdbg(PKT,
  94                                            "PIObuf[%u] @%p pbc is %x; ",
  95                                            i, piobuf, readl(piobuf));
  96
  97                                 ipath_disarm_piobufs(dd, i, 1);
  98                         }
  99                 }
 100                 if (ipath_debug & __IPATH_PKTDBG)
 101                         printk("\n");
 102         }
 103         if ((errs & (INFINIPATH_E_SDROPPEDDATAPKT |
 104                      INFINIPATH_E_SDROPPEDSMPPKT |
 105                      INFINIPATH_E_SMINPKTLEN)) &&
 106             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 107                 /*
 108                  * This can happen when SMA is trying to bring the link
 109                  * up, but the IB link changes state at the "wrong" time.
 110                  * The IB logic then complains that the packet isn't
 111                  * valid.  We don't want to confuse people, so we just
 112                  * don't print them, except at debug
 113                  */
 114                 ipath_dbg("Ignoring pktsend errors %llx, because not "
 115                           "yet active\n", (unsigned long long) errs);
 116                 ignore_this_time = INFINIPATH_E_SDROPPEDDATAPKT |
 117                         INFINIPATH_E_SDROPPEDSMPPKT |
 118                         INFINIPATH_E_SMINPKTLEN;
 119         }
 120
 121         return ignore_this_time;
 122 }
 123
 124 /* return the strings for the most common link states */
 125 static char *ib_linkstate(u32 linkstate)
 126 {
 127         char *ret;
 128
 129         switch (linkstate) {
 130         case IPATH_IBSTATE_INIT:
 131                 ret = "Init";
 132                 break;
 133         case IPATH_IBSTATE_ARM:
 134                 ret = "Arm";
 135                 break;
 136         case IPATH_IBSTATE_ACTIVE:
 137                 ret = "Active";
 138                 break;
 139         default:
 140                 ret = "Down";
 141         }
 142
 143         return ret;
 144 }
 145
 146 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 147                                      ipath_err_t errs, int noprint)
 148 {
 149         u64 val;
 150         u32 ltstate, lstate;
 151
 152         /*
 153          * even if diags are enabled, we want to notice LINKINIT, etc.
 154          * We just don't want to change the LED state, or
 155          * dd->ipath_kregs->kr_ibcctrl
 156          */
 157         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
 158         lstate = val & IPATH_IBSTATE_MASK;
 159         if (lstate == IPATH_IBSTATE_INIT || lstate == IPATH_IBSTATE_ARM ||
 160             lstate == IPATH_IBSTATE_ACTIVE) {
 161                 /*
 162                  * only print at SMA if there is a change, debug if not
 163                  * (sometimes we want to know that, usually not).
 164                  */
 165                 if (lstate == ((unsigned) dd->ipath_lastibcstat
 166                                & IPATH_IBSTATE_MASK)) {
 167                         ipath_dbg("Status change intr but no change (%s)\n",
 168                                   ib_linkstate(lstate));
 169                 }
 170                 else
 171                         ipath_cdbg(SMA, "Unit %u link state %s, last "
 172                                    "was %s\n", dd->ipath_unit,
 173                                    ib_linkstate(lstate),
 174                                    ib_linkstate((unsigned)
 175                                                 dd->ipath_lastibcstat
 176                                                 & IPATH_IBSTATE_MASK));
 177         }
 178         else {
 179                 lstate = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
 180                 if (lstate == IPATH_IBSTATE_INIT ||
 181                     lstate == IPATH_IBSTATE_ARM ||
 182                     lstate == IPATH_IBSTATE_ACTIVE)
 183                         ipath_cdbg(SMA, "Unit %u link state down"
 184                                    " (state 0x%x), from %s\n",
 185                                    dd->ipath_unit,
 186                                    (u32)val & IPATH_IBSTATE_MASK,
 187                                    ib_linkstate(lstate));
 188                 else
 189                         ipath_cdbg(VERBOSE, "Unit %u link state changed "
 190                                    "to 0x%x from down (%x)\n",
 191                                    dd->ipath_unit, (u32) val, lstate);
 192         }
 193         ltstate = (val >> INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT) &
 194                 INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
 195         lstate = (val >> INFINIPATH_IBCS_LINKSTATE_SHIFT) &
 196                 INFINIPATH_IBCS_LINKSTATE_MASK;
 197
 198         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 199             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 200                 u32 last_ltstate;
 201
 202                 /*
 203                  * Ignore cycling back and forth from Polling.Active
 204                  * to Polling.Quiet while waiting for the other end of
 205                  * the link to come up. We will cycle back and forth
 206                  * between them if no cable is plugged in,
 207                  * the other device is powered off or disabled, etc.
 208                  */
 209                 last_ltstate = (dd->ipath_lastibcstat >>
 210                                 INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT)
 211                         & INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
 212                 if (last_ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE
 213                     || last_ltstate ==
 214                     INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 215                         if (dd->ipath_ibpollcnt > 40) {
 216                                 dd->ipath_flags |= IPATH_NOCABLE;
 217                                 *dd->ipath_statusp |=
 218                                         IPATH_STATUS_IB_NOCABLE;
 219                         } else
 220                                 dd->ipath_ibpollcnt++;
 221                         goto skip_ibchange;
 222                 }
 223         }
 224         dd->ipath_ibpollcnt = 0;        /* some state other than 2 or 3 */
 225         ipath_stats.sps_iblink++;
 226         if (ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
 227                 dd->ipath_flags |= IPATH_LINKDOWN;
 228                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 229                                      | IPATH_LINKACTIVE |
 230                                      IPATH_LINKARMED);
 231                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 232                 if (!noprint) {
 233                         if (((dd->ipath_lastibcstat >>
 234                               INFINIPATH_IBCS_LINKSTATE_SHIFT) &
 235                              INFINIPATH_IBCS_LINKSTATE_MASK)
 236                             == INFINIPATH_IBCS_L_STATE_ACTIVE)
 237                                 /* if from up to down be more vocal */
 238                                 ipath_cdbg(SMA,
 239                                            "Unit %u link now down (%s)\n",
 240                                            dd->ipath_unit,
 241                                            ipath_ibcstatus_str[ltstate]);
 242                         else
 243                                 ipath_cdbg(VERBOSE, "Unit %u link is "
 244                                            "down (%s)\n", dd->ipath_unit,
 245                                            ipath_ibcstatus_str[ltstate]);
 246                 }
 247
 248                 dd->ipath_f_setextled(dd, lstate, ltstate);
 249         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ACTIVE) {
 250                 dd->ipath_flags |= IPATH_LINKACTIVE;
 251                 dd->ipath_flags &=
 252                         ~(IPATH_LINKUNK | IPATH_LINKINIT | IPATH_LINKDOWN |
 253                           IPATH_LINKARMED | IPATH_NOCABLE);
 254                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
 255                 *dd->ipath_statusp |=
 256                         IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
 257                 dd->ipath_f_setextled(dd, lstate, ltstate);
 258
 259                 __ipath_layer_intr(dd, IPATH_LAYER_INT_IF_UP);
 260         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_INIT) {
 261                 /*
 262                  * set INIT and DOWN.  Down is checked by most of the other
 263                  * code, but INIT is useful to know in a few places.
 264                  */
 265                 dd->ipath_flags |= IPATH_LINKINIT | IPATH_LINKDOWN;
 266                 dd->ipath_flags &=
 267                         ~(IPATH_LINKUNK | IPATH_LINKACTIVE | IPATH_LINKARMED
 268                           | IPATH_NOCABLE);
 269                 *dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
 270                                         | IPATH_STATUS_IB_READY);
 271                 dd->ipath_f_setextled(dd, lstate, ltstate);
 272         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ARM) {
 273                 dd->ipath_flags |= IPATH_LINKARMED;
 274                 dd->ipath_flags &=
 275                         ~(IPATH_LINKUNK | IPATH_LINKDOWN | IPATH_LINKINIT |
 276                           IPATH_LINKACTIVE | IPATH_NOCABLE);
 277                 *dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
 278                                         | IPATH_STATUS_IB_READY);
 279                 dd->ipath_f_setextled(dd, lstate, ltstate);
 280         } else {
 281                 if (!noprint)
 282                         ipath_dbg("IBstatuschange unit %u: %s (%x)\n",
 283                                   dd->ipath_unit,
 284                                   ipath_ibcstatus_str[ltstate], ltstate);
 285         }
 286 skip_ibchange:
 287         dd->ipath_lastibcstat = val;
 288 }
 289
 290 static void handle_supp_msgs(struct ipath_devdata *dd,
 291                              unsigned supp_msgs, char msg[512])
 292 {
 293         /*
 294          * Print the message unless it's ibc status change only, which
 295          * happens so often we never want to count it.
 296          */
 297         if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
 298                 ipath_decode_err(msg, sizeof msg, dd->ipath_lasterror &
 299                                  ~INFINIPATH_E_IBSTATUSCHANGED);
 300                 if (dd->ipath_lasterror &
 301                     ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
 302                         ipath_dev_err(dd, "Suppressed %u messages for "
 303                                       "fast-repeating errors (%s) (%llx)\n",
 304                                       supp_msgs, msg,
 305                                       (unsigned long long)
 306                                       dd->ipath_lasterror);
 307                 else {
 308                         /*
 309                          * rcvegrfull and rcvhdrqfull are "normal", for some
 310                          * types of processes (mostly benchmarks) that send
 311                          * huge numbers of messages, while not processing
 312                          * them. So only complain about these at debug
 313                          * level.
 314                          */
 315                         ipath_dbg("Suppressed %u messages for %s\n",
 316                                   supp_msgs, msg);
 317                 }
 318         }
 319 }
 320
 321 static unsigned handle_frequent_errors(struct ipath_devdata *dd,
 322                                        ipath_err_t errs, char msg[512],
 323                                        int *noprint)
 324 {
 325         unsigned long nc;
 326         static unsigned long nextmsg_time;
 327         static unsigned nmsgs, supp_msgs;
 328
 329         /*
 330          * Throttle back "fast" messages to no more than 10 per 5 seconds.
 331          * This isn't perfect, but it's a reasonable heuristic. If we get
 332          * more than 10, give a 6x longer delay.
 333          */
 334         nc = jiffies;
 335         if (nmsgs > 10) {
 336                 if (time_before(nc, nextmsg_time)) {
 337                         *noprint = 1;
 338                         if (!supp_msgs++)
 339                                 nextmsg_time = nc + HZ * 3;
 340                 }
 341                 else if (supp_msgs) {
 342                         handle_supp_msgs(dd, supp_msgs, msg);
 343                         supp_msgs = 0;
 344                         nmsgs = 0;
 345                 }
 346         }
 347         else if (!nmsgs++ || time_after(nc, nextmsg_time))
 348                 nextmsg_time = nc + HZ / 2;
 349
 350         return supp_msgs;
 351 }
 352
 353 static void handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
 354 {
 355         char msg[512];
 356         u64 ignore_this_time = 0;
 357         int i;
 358         int chkerrpkts = 0, noprint = 0;
 359         unsigned supp_msgs;
 360
 361         supp_msgs = handle_frequent_errors(dd, errs, msg, &noprint);
 362
 363         /*
 364          * don't report errors that are masked (includes those always
 365          * ignored)
 366          */
 367         errs &= ~dd->ipath_maskederrs;
 368
 369         /* do these first, they are most important */
 370         if (errs & INFINIPATH_E_HARDWARE) {
 371                 /* reuse same msg buf */
 372                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
 373         }
 374
 375         if (!noprint && (errs & ~infinipath_e_bitsextant))
 376                 ipath_dev_err(dd, "error interrupt with unknown errors "
 377                               "%llx set\n", (unsigned long long)
 378                               (errs & ~infinipath_e_bitsextant));
 379
 380         if (errs & E_SUM_ERRS)
 381                 ignore_this_time = handle_e_sum_errs(dd, errs);
 382
 383         if (supp_msgs == 250000) {
 384                 /*
 385                  * It's not entirely reasonable assuming that the errors set
 386                  * in the last clear period are all responsible for the
 387                  * problem, but the alternative is to assume it's the only
 388                  * ones on this particular interrupt, which also isn't great
 389                  */
 390                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
 391                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 392                                  ~dd->ipath_maskederrs);
 393                 ipath_decode_err(msg, sizeof msg,
 394                                  (dd->ipath_maskederrs & ~dd->
 395                                   ipath_ignorederrs));
 396
 397                 if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
 398                     ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
 399                         ipath_dev_err(dd, "Disabling error(s) %llx because "
 400                                       "occuring too frequently (%s)\n",
 401                                       (unsigned long long)
 402                                       (dd->ipath_maskederrs &
 403                                        ~dd->ipath_ignorederrs), msg);
 404                 else {
 405                         /*
 406                          * rcvegrfull and rcvhdrqfull are "normal",
 407                          * for some types of processes (mostly benchmarks)
 408                          * that send huge numbers of messages, while not
 409                          * processing them.  So only complain about
 410                          * these at debug level.
 411                          */
 412                         ipath_dbg("Disabling frequent queue full errors "
 413                                   "(%s)\n", msg);
 414                 }
 415
 416                 /*
 417                  * Re-enable the masked errors after around 3 minutes.  in
 418                  * ipath_get_faststats().  If we have a series of fast
 419                  * repeating but different errors, the interval will keep
 420                  * stretching out, but that's OK, as that's pretty
 421                  * catastrophic.
 422                  */
 423                 dd->ipath_unmasktime = jiffies + HZ * 180;
 424         }
 425
 426         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
 427         if (ignore_this_time)
 428                 errs &= ~ignore_this_time;
 429         if (errs & ~dd->ipath_lasterror) {
 430                 errs &= ~dd->ipath_lasterror;
 431                 /* never suppress duplicate hwerrors or ibstatuschange */
 432                 dd->ipath_lasterror |= errs &
 433                         ~(INFINIPATH_E_HARDWARE |
 434                           INFINIPATH_E_IBSTATUSCHANGED);
 435         }
 436         if (!errs)
 437                 return;
 438
 439         if (!noprint)
 440                 /*
 441                  * the ones we mask off are handled specially below or above
 442                  */
 443                 ipath_decode_err(msg, sizeof msg,
 444                                  errs & ~(INFINIPATH_E_IBSTATUSCHANGED |
 445                                           INFINIPATH_E_RRCVEGRFULL |
 446                                           INFINIPATH_E_RRCVHDRFULL |
 447                                           INFINIPATH_E_HARDWARE));
 448         else
 449                 /* so we don't need if (!noprint) at strlcat's below */
 450                 *msg = 0;
 451
 452         if (errs & E_SUM_PKTERRS) {
 453                 ipath_stats.sps_pkterrs++;
 454                 chkerrpkts = 1;
 455         }
 456         if (errs & E_SUM_ERRS)
 457                 ipath_stats.sps_errs++;
 458
 459         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
 460                 ipath_stats.sps_crcerrs++;
 461                 chkerrpkts = 1;
 462         }
 463
 464         /*
 465          * We don't want to print these two as they happen, or we can make
 466          * the situation even worse, because it takes so long to print
 467          * messages to serial consoles.  Kernel ports get printed from
 468          * fast_stats, no more than every 5 seconds, user ports get printed
 469          * on close
 470          */
 471         if (errs & INFINIPATH_E_RRCVHDRFULL) {
 472                 int any;
 473                 u32 hd, tl;
 474                 ipath_stats.sps_hdrqfull++;
 475                 for (any = i = 0; i < dd->ipath_cfgports; i++) {
 476                         struct ipath_portdata *pd = dd->ipath_pd[i];
 477                         if (i == 0) {
 478                                 hd = dd->ipath_port0head;
 479                                 tl = (u32) le64_to_cpu(
 480                                         *dd->ipath_hdrqtailptr);
 481                         } else if (pd && pd->port_cnt &&
 482                                    pd->port_rcvhdrtail_kvaddr) {
 483                                 /*
 484                                  * don't report same point multiple times,
 485                                  * except kernel
 486                                  */
 487                                 tl = (u32) * pd->port_rcvhdrtail_kvaddr;
 488                                 if (tl == dd->ipath_lastrcvhdrqtails[i])
 489                                         continue;
 490                                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead,
 491                                                        i);
 492                         } else
 493                                 continue;
 494                         if (hd == (tl + 1) ||
 495                             (!hd && tl == dd->ipath_hdrqlast)) {
 496                                 dd->ipath_lastrcvhdrqtails[i] = tl;
 497                                 pd->port_hdrqfull++;
 498                                 if (i == 0)
 499                                         chkerrpkts = 1;
 500                         }
 501                 }
 502         }
 503         if (errs & INFINIPATH_E_RRCVEGRFULL) {
 504                 /*
 505                  * since this is of less importance and not likely to
 506                  * happen without also getting hdrfull, only count
 507                  * occurrences; don't check each port (or even the kernel
 508                  * vs user)
 509                  */
 510                 ipath_stats.sps_etidfull++;
 511                 if (dd->ipath_port0head !=
 512                     (u32) le64_to_cpu(*dd->ipath_hdrqtailptr))
 513                         chkerrpkts = 1;
 514         }
 515
 516         /*
 517          * do this before IBSTATUSCHANGED, in case both bits set in a single
 518          * interrupt; we want the STATUSCHANGE to "win", so we do our
 519          * internal copy of state machine correctly
 520          */
 521         if (errs & INFINIPATH_E_RIBLOSTLINK) {
 522                 /*
 523                  * force through block below
 524                  */
 525                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
 526                 ipath_stats.sps_iblink++;
 527                 dd->ipath_flags |= IPATH_LINKDOWN;
 528                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 529                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
 530                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 531                 if (!noprint) {
 532                         u64 st = ipath_read_kreg64(
 533                                 dd, dd->ipath_kregs->kr_ibcstatus);
 534
 535                         ipath_dbg("Lost link, link now down (%s)\n",
 536                                   ipath_ibcstatus_str[st & 0xf]);
 537                 }
 538         }
 539         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
 540                 handle_e_ibstatuschanged(dd, errs, noprint);
 541
 542         if (errs & INFINIPATH_E_RESET) {
 543                 if (!noprint)
 544                         ipath_dev_err(dd, "Got reset, requires re-init "
 545                                       "(unload and reload driver)\n");
 546                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
 547                 /* mark as having had error */
 548                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 549                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
 550         }
 551
 552         if (!noprint && *msg)
 553                 ipath_dev_err(dd, "%s error\n", msg);
 554         if (dd->ipath_sma_state_wanted & dd->ipath_flags) {
 555                 ipath_cdbg(VERBOSE, "sma wanted state %x, iflags now %x, "
 556                            "waking\n", dd->ipath_sma_state_wanted,
 557                            dd->ipath_flags);
 558                 wake_up_interruptible(&ipath_sma_state_wait);
 559         }
 560
 561         if (chkerrpkts)
 562                 /* process possible error packets in hdrq */
 563                 ipath_kreceive(dd);
 564 }
 565
 566 /* this is separate to allow for better optimization of ipath_intr() */
 567
 568 static void ipath_bad_intr(struct ipath_devdata *dd, u32 * unexpectp)
 569 {
 570         /*
 571          * sometimes happen during driver init and unload, don't want
 572          * to process any interrupts at that point
 573          */
 574
 575         /* this is just a bandaid, not a fix, if something goes badly
 576          * wrong */
 577         if (++*unexpectp > 100) {
 578                 if (++*unexpectp > 105) {
 579                         /*
 580                          * ok, we must be taking somebody else's interrupts,
 581                          * due to a messed up mptable and/or PIRQ table, so
 582                          * unregister the interrupt.  We've seen this during
 583                          * linuxbios development work, and it may happen in
 584                          * the future again.
 585                          */
 586                         if (dd->pcidev && dd->pcidev->irq) {
 587                                 ipath_dev_err(dd, "Now %u unexpected "
 588                                               "interrupts, unregistering "
 589                                               "interrupt handler\n",
 590                                               *unexpectp);
 591                                 ipath_dbg("free_irq of irq %x\n",
 592                                           dd->pcidev->irq);
 593                                 free_irq(dd->pcidev->irq, dd);
 594                         }
 595                 }
 596                 if (ipath_read_kreg32(dd, dd->ipath_kregs->kr_intmask)) {
 597                         ipath_dev_err(dd, "%u unexpected interrupts, "
 598                                       "disabling interrupts completely\n",
 599                                       *unexpectp);
 600                         /*
 601                          * disable all interrupts, something is very wrong
 602                          */
 603                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 604                                          0ULL);
 605                 }
 606         } else if (*unexpectp > 1)
 607                 ipath_dbg("Interrupt when not ready, should not happen, "
 608                           "ignoring\n");
 609 }
 610
 611 static void ipath_bad_regread(struct ipath_devdata *dd)
 612 {
 613         static int allbits;
 614
 615         /* separate routine, for better optimization of ipath_intr() */
 616
 617         /*
 618          * We print the message and disable interrupts, in hope of
 619          * having a better chance of debugging the problem.
 620          */
 621         ipath_dev_err(dd,
 622                       "Read of interrupt status failed (all bits set)\n");
 623         if (allbits++) {
 624                 /* disable all interrupts, something is very wrong */
 625                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 626                 if (allbits == 2) {
 627                         ipath_dev_err(dd, "Still bad interrupt status, "
 628                                       "unregistering interrupt\n");
 629                         free_irq(dd->pcidev->irq, dd);
 630                 } else if (allbits > 2) {
 631                         if ((allbits % 10000) == 0)
 632                                 printk(".");
 633                 } else
 634                         ipath_dev_err(dd, "Disabling interrupts, "
 635                                       "multiple errors\n");
 636         }
 637 }
 638
 639 static void handle_port_pioavail(struct ipath_devdata *dd)
 640 {
 641         u32 i;
 642         /*
 643          * start from port 1, since for now port 0  is never using
 644          * wait_event for PIO
 645          */
 646         for (i = 1; dd->ipath_portpiowait && i < dd->ipath_cfgports; i++) {
 647                 struct ipath_portdata *pd = dd->ipath_pd[i];
 648
 649                 if (pd && pd->port_cnt &&
 650                     dd->ipath_portpiowait & (1U << i)) {
 651                         clear_bit(i, &dd->ipath_portpiowait);
 652                         if (test_bit(IPATH_PORT_WAITING_PIO,
 653                                      &pd->port_flag)) {
 654                                 clear_bit(IPATH_PORT_WAITING_PIO,
 655                                           &pd->port_flag);
 656                                 wake_up_interruptible(&pd->port_wait);
 657                         }
 658                 }
 659         }
 660 }
 661
 662 static void handle_layer_pioavail(struct ipath_devdata *dd)
 663 {
 664         int ret;
 665
 666         ret = __ipath_layer_intr(dd, IPATH_LAYER_INT_SEND_CONTINUE);
 667         if (ret > 0)
 668                 goto set;
 669
 670         ret = __ipath_verbs_piobufavail(dd);
 671         if (ret > 0)
 672                 goto set;
 673
 674         return;
 675 set:
 676         set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
 677         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 678                          dd->ipath_sendctrl);
 679 }
 680
 681 static void handle_rcv(struct ipath_devdata *dd, u32 istat)
 682 {
 683         u64 portr;
 684         int i;
 685         int rcvdint = 0;
 686
 687         portr = ((istat >> INFINIPATH_I_RCVAVAIL_SHIFT) &
 688                  infinipath_i_rcvavail_mask)
 689                 | ((istat >> INFINIPATH_I_RCVURG_SHIFT) &
 690                    infinipath_i_rcvurg_mask);
 691         for (i = 0; i < dd->ipath_cfgports; i++) {
 692                 struct ipath_portdata *pd = dd->ipath_pd[i];
 693                 if (portr & (1 << i) && pd &&
 694                     pd->port_cnt) {
 695                         if (i == 0)
 696                                 ipath_kreceive(dd);
 697                         else if (test_bit(IPATH_PORT_WAITING_RCV,
 698                                           &pd->port_flag)) {
 699                                 int rcbit;
 700                                 clear_bit(IPATH_PORT_WAITING_RCV,
 701                                           &pd->port_flag);
 702                                 rcbit = i + INFINIPATH_R_INTRAVAIL_SHIFT;
 703                                 clear_bit(1UL << rcbit, &dd->ipath_rcvctrl);
 704                                 wake_up_interruptible(&pd->port_wait);
 705                                 rcvdint = 1;
 706                         }
 707                 }
 708         }
 709         if (rcvdint) {
 710                 /* only want to take one interrupt, so turn off the rcv
 711                  * interrupt for all the ports that we did the wakeup on
 712                  * (but never for kernel port)
 713                  */
 714                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 715                                  dd->ipath_rcvctrl);
 716         }
 717 }
 718
 719 irqreturn_t ipath_intr(int irq, void *data, struct pt_regs *regs)
 720 {
 721         struct ipath_devdata *dd = data;
 722         u32 istat;
 723         ipath_err_t estat = 0;
 724         static unsigned unexpected = 0;
 725         irqreturn_t ret;
 726
 727         if(!(dd->ipath_flags & IPATH_PRESENT)) {
 728                 /* this is mostly so we don't try to touch the chip while
 729                  * it is being reset */
 730                 /*
 731                  * This return value is perhaps odd, but we do not want the
 732                  * interrupt core code to remove our interrupt handler
 733                  * because we don't appear to be handling an interrupt
 734                  * during a chip reset.
 735                  */
 736                 return IRQ_HANDLED;
 737         }
 738
 739         istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
 740         if (unlikely(!istat)) {
 741                 ipath_stats.sps_nullintr++;
 742                 ret = IRQ_NONE; /* not our interrupt, or already handled */
 743                 goto bail;
 744         }
 745         if (unlikely(istat == -1)) {
 746                 ipath_bad_regread(dd);
 747                 /* don't know if it was our interrupt or not */
 748                 ret = IRQ_NONE;
 749                 goto bail;
 750         }
 751
 752         ipath_stats.sps_ints++;
 753
 754         /*
 755          * this needs to be flags&initted, not statusp, so we keep
 756          * taking interrupts even after link goes down, etc.
 757          * Also, we *must* clear the interrupt at some point, or we won't
 758          * take it again, which can be real bad for errors, etc...
 759          */
 760
 761         if (!(dd->ipath_flags & IPATH_INITTED)) {
 762                 ipath_bad_intr(dd, &unexpected);
 763                 ret = IRQ_NONE;
 764                 goto bail;
 765         }
 766         if (unexpected)
 767                 unexpected = 0;
 768
 769         ipath_cdbg(VERBOSE, "intr stat=0x%x\n", istat);
 770
 771         if (istat & ~infinipath_i_bitsextant)
 772                 ipath_dev_err(dd,
 773                               "interrupt with unknown interrupts %x set\n",
 774                               istat & (u32) ~ infinipath_i_bitsextant);
 775
 776         if (istat & INFINIPATH_I_ERROR) {
 777                 ipath_stats.sps_errints++;
 778                 estat = ipath_read_kreg64(dd,
 779                                           dd->ipath_kregs->kr_errorstatus);
 780                 if (!estat)
 781                         dev_info(&dd->pcidev->dev, "error interrupt (%x), "
 782                                  "but no error bits set!\n", istat);
 783                 else if (estat == -1LL)
 784                         /*
 785                          * should we try clearing all, or hope next read
 786                          * works?
 787                          */
 788                         ipath_dev_err(dd, "Read of error status failed "
 789                                       "(all bits set); ignoring\n");
 790                 else
 791                         handle_errors(dd, estat);
 792         }
 793
 794         if (istat & INFINIPATH_I_GPIO) {
 795                 if (unlikely(!(dd->ipath_flags & IPATH_GPIO_INTR))) {
 796                         u32 gpiostatus;
 797                         gpiostatus = ipath_read_kreg32(
 798                                 dd, dd->ipath_kregs->kr_gpio_status);
 799                         ipath_dbg("Unexpected GPIO interrupt bits %x\n",
 800                                   gpiostatus);
 801                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
 802                                          gpiostatus);
 803                 }
 804                 else {
 805                         /* Clear GPIO status bit 2 */
 806                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
 807                                          (u64) (1 << 2));
 808
 809                         /*
 810                          * Packets are available in the port 0 rcv queue.
 811                          * Eventually this needs to be generalized to check
 812                          * IPATH_GPIO_INTR, and the specific GPIO bit, if
 813                          * GPIO interrupts are used for anything else.
 814                          */
 815                         ipath_kreceive(dd);
 816                 }
 817         }
 818
 819         /*
 820          * clear the ones we will deal with on this round
 821          * We clear it early, mostly for receive interrupts, so we
 822          * know the chip will have seen this by the time we process
 823          * the queue, and will re-interrupt if necessary.  The processor
 824          * itself won't take the interrupt again until we return.
 825          */
 826         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
 827
 828         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
 829                 clear_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
 830                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 831                                  dd->ipath_sendctrl);
 832
 833                 if (dd->ipath_portpiowait)
 834                         handle_port_pioavail(dd);
 835
 836                 handle_layer_pioavail(dd);
 837         }
 838
 839         /*
 840          * we check for both transition from empty to non-empty, and urgent
 841          * packets (those with the interrupt bit set in the header)
 842          */
 843
 844         if (istat & ((infinipath_i_rcvavail_mask <<
 845                       INFINIPATH_I_RCVAVAIL_SHIFT)
 846                      | (infinipath_i_rcvurg_mask <<
 847                         INFINIPATH_I_RCVURG_SHIFT)))
 848                 handle_rcv(dd, istat);
 849
 850         ret = IRQ_HANDLED;
 851
 852 bail:
 853         return ret;
 854 }