drivers/infiniband/hw/ipath/ipath_intr.c

   1 /*
   2  * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/pci.h>
  35 #include <linux/delay.h>
  36
  37 #include "ipath_kernel.h"
  38 #include "ipath_verbs.h"
  39 #include "ipath_common.h"
  40
  41 /*
  42  * clear (write) a pio buffer, to clear a parity error.   This routine
  43  * should only be called when in freeze mode, and the buffer should be
  44  * canceled afterwards.
  45  */
  46 static void ipath_clrpiobuf(struct ipath_devdata *dd, u32 pnum)
  47 {
  48         u32 __iomem *pbuf;
  49         u32 dwcnt; /* dword count to write */
  50         if (pnum < dd->ipath_piobcnt2k) {
  51                 pbuf = (u32 __iomem *) (dd->ipath_pio2kbase + pnum *
  52                         dd->ipath_palign);
  53                 dwcnt = dd->ipath_piosize2k >> 2;
  54         }
  55         else {
  56                 pbuf = (u32 __iomem *) (dd->ipath_pio4kbase +
  57                         (pnum - dd->ipath_piobcnt2k) * dd->ipath_4kalign);
  58                 dwcnt = dd->ipath_piosize4k >> 2;
  59         }
  60         dev_info(&dd->pcidev->dev,
  61                 "Rewrite PIO buffer %u, to recover from parity error\n",
  62                 pnum);
  63
  64         /* no flush required, since already in freeze */
  65         writel(dwcnt + 1, pbuf);
  66         while (--dwcnt)
  67                 writel(0, pbuf++);
  68 }
  69
  70 /*
  71  * Called when we might have an error that is specific to a particular
  72  * PIO buffer, and may need to cancel that buffer, so it can be re-used.
  73  * If rewrite is true, and bits are set in the sendbufferror registers,
  74  * we'll write to the buffer, for error recovery on parity errors.
  75  */
  76 void ipath_disarm_senderrbufs(struct ipath_devdata *dd, int rewrite)
  77 {
  78         u32 piobcnt;
  79         unsigned long sbuf[4];
  80         /*
  81          * it's possible that sendbuffererror could have bits set; might
  82          * have already done this as a result of hardware error handling
  83          */
  84         piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
  85         /* read these before writing errorclear */
  86         sbuf[0] = ipath_read_kreg64(
  87                 dd, dd->ipath_kregs->kr_sendbuffererror);
  88         sbuf[1] = ipath_read_kreg64(
  89                 dd, dd->ipath_kregs->kr_sendbuffererror + 1);
  90         if (piobcnt > 128)
  91                 sbuf[2] = ipath_read_kreg64(
  92                         dd, dd->ipath_kregs->kr_sendbuffererror + 2);
  93         if (piobcnt > 192)
  94                 sbuf[3] = ipath_read_kreg64(
  95                         dd, dd->ipath_kregs->kr_sendbuffererror + 3);
  96         else
  97                 sbuf[3] = 0;
  98
  99         if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
 100                 int i;
 101                 if (ipath_debug & (__IPATH_PKTDBG|__IPATH_DBG) &&
 102                         dd->ipath_lastcancel > jiffies) {
 103                         __IPATH_DBG_WHICH(__IPATH_PKTDBG|__IPATH_DBG,
 104                                           "SendbufErrs %lx %lx", sbuf[0],
 105                                           sbuf[1]);
 106                         if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
 107                                 printk(" %lx %lx ", sbuf[2], sbuf[3]);
 108                         printk("\n");
 109                 }
 110
 111                 for (i = 0; i < piobcnt; i++)
 112                         if (test_bit(i, sbuf)) {
 113                                 if (rewrite)
 114                                         ipath_clrpiobuf(dd, i);
 115                                 ipath_disarm_piobufs(dd, i, 1);
 116                         }
 117                 /* ignore armlaunch errs for a bit */
 118                 dd->ipath_lastcancel = jiffies+3;
 119         }
 120 }
 121
 122
 123 /* These are all rcv-related errors which we want to count for stats */
 124 #define E_SUM_PKTERRS \
 125         (INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
 126          INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
 127          INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
 128          INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
 129          INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
 130          INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
 131
 132 /* These are all send-related errors which we want to count for stats */
 133 #define E_SUM_ERRS \
 134         (INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
 135          INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 136          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
 137          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 138          INFINIPATH_E_INVALIDADDR)
 139
 140 /*
 141  * this is similar to E_SUM_ERRS, but can't ignore armlaunch, don't ignore
 142  * errors not related to freeze and cancelling buffers.  Can't ignore
 143  * armlaunch because could get more while still cleaning up, and need
 144  * to cancel those as they happen.
 145  */
 146 #define E_SPKT_ERRS_IGNORE \
 147          (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 148          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SMINPKTLEN | \
 149          INFINIPATH_E_SPKTLEN)
 150
 151 /*
 152  * these are errors that can occur when the link changes state while
 153  * a packet is being sent or received.  This doesn't cover things
 154  * like EBP or VCRC that can be the result of a sending having the
 155  * link change state, so we receive a "known bad" packet.
 156  */
 157 #define E_SUM_LINK_PKTERRS \
 158         (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 159          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 160          INFINIPATH_E_RSHORTPKTLEN | INFINIPATH_E_RMINPKTLEN | \
 161          INFINIPATH_E_RUNEXPCHAR)
 162
 163 static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
 164 {
 165         u64 ignore_this_time = 0;
 166
 167         ipath_disarm_senderrbufs(dd, 0);
 168         if ((errs & E_SUM_LINK_PKTERRS) &&
 169             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 170                 /*
 171                  * This can happen when SMA is trying to bring the link
 172                  * up, but the IB link changes state at the "wrong" time.
 173                  * The IB logic then complains that the packet isn't
 174                  * valid.  We don't want to confuse people, so we just
 175                  * don't print them, except at debug
 176                  */
 177                 ipath_dbg("Ignoring packet errors %llx, because link not "
 178                           "ACTIVE\n", (unsigned long long) errs);
 179                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 180         }
 181
 182         return ignore_this_time;
 183 }
 184
 185 /* generic hw error messages... */
 186 #define INFINIPATH_HWE_TXEMEMPARITYERR_MSG(a) \
 187         { \
 188                 .mask = ( INFINIPATH_HWE_TXEMEMPARITYERR_##a <<    \
 189                           INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT ),   \
 190                 .msg = "TXE " #a " Memory Parity"            \
 191         }
 192 #define INFINIPATH_HWE_RXEMEMPARITYERR_MSG(a) \
 193         { \
 194                 .mask = ( INFINIPATH_HWE_RXEMEMPARITYERR_##a <<    \
 195                           INFINIPATH_HWE_RXEMEMPARITYERR_SHIFT ),   \
 196                 .msg = "RXE " #a " Memory Parity"            \
 197         }
 198
 199 static const struct ipath_hwerror_msgs ipath_generic_hwerror_msgs[] = {
 200         INFINIPATH_HWE_MSG(IBCBUSFRSPCPARITYERR, "IPATH2IB Parity"),
 201         INFINIPATH_HWE_MSG(IBCBUSTOSPCPARITYERR, "IB2IPATH Parity"),
 202
 203         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOBUF),
 204         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOPBC),
 205         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOLAUNCHFIFO),
 206
 207         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(RCVBUF),
 208         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(LOOKUPQ),
 209         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EAGERTID),
 210         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EXPTID),
 211         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(FLAGBUF),
 212         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(DATAINFO),
 213         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(HDRINFO),
 214 };
 215
 216 /**
 217  * ipath_format_hwmsg - format a single hwerror message
 218  * @msg message buffer
 219  * @msgl length of message buffer
 220  * @hwmsg message to add to message buffer
 221  */
 222 static void ipath_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
 223 {
 224         strlcat(msg, "[", msgl);
 225         strlcat(msg, hwmsg, msgl);
 226         strlcat(msg, "]", msgl);
 227 }
 228
 229 /**
 230  * ipath_format_hwerrors - format hardware error messages for display
 231  * @hwerrs hardware errors bit vector
 232  * @hwerrmsgs hardware error descriptions
 233  * @nhwerrmsgs number of hwerrmsgs
 234  * @msg message buffer
 235  * @msgl message buffer length
 236  */
 237 void ipath_format_hwerrors(u64 hwerrs,
 238                            const struct ipath_hwerror_msgs *hwerrmsgs,
 239                            size_t nhwerrmsgs,
 240                            char *msg, size_t msgl)
 241 {
 242         int i;
 243         const int glen =
 244             sizeof(ipath_generic_hwerror_msgs) /
 245             sizeof(ipath_generic_hwerror_msgs[0]);
 246
 247         for (i=0; i<glen; i++) {
 248                 if (hwerrs & ipath_generic_hwerror_msgs[i].mask) {
 249                         ipath_format_hwmsg(msg, msgl,
 250                                            ipath_generic_hwerror_msgs[i].msg);
 251                 }
 252         }
 253
 254         for (i=0; i<nhwerrmsgs; i++) {
 255                 if (hwerrs & hwerrmsgs[i].mask) {
 256                         ipath_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
 257                 }
 258         }
 259 }
 260
 261 /* return the strings for the most common link states */
 262 static char *ib_linkstate(struct ipath_devdata *dd, u64 ibcs)
 263 {
 264         char *ret;
 265         u32 state;
 266
 267         state = ipath_ib_state(dd, ibcs);
 268         if (state == dd->ib_init)
 269                 ret = "Init";
 270         else if (state == dd->ib_arm)
 271                 ret = "Arm";
 272         else if (state == dd->ib_active)
 273                 ret = "Active";
 274         else
 275                 ret = "Down";
 276         return ret;
 277 }
 278
 279 void signal_ib_event(struct ipath_devdata *dd, enum ib_event_type ev)
 280 {
 281         struct ib_event event;
 282
 283         event.device = &dd->verbs_dev->ibdev;
 284         event.element.port_num = 1;
 285         event.event = ev;
 286         ib_dispatch_event(&event);
 287 }
 288
 289 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 290                                      ipath_err_t errs)
 291 {
 292         u32 ltstate, lstate, ibstate, lastlstate;
 293         u32 init = dd->ib_init;
 294         u32 arm = dd->ib_arm;
 295         u32 active = dd->ib_active;
 296         const u64 ibcs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
 297
 298         lstate = ipath_ib_linkstate(dd, ibcs); /* linkstate */
 299         ibstate = ipath_ib_state(dd, ibcs);
 300         /* linkstate at last interrupt */
 301         lastlstate = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
 302         ltstate = ipath_ib_linktrstate(dd, ibcs); /* linktrainingtate */
 303
 304         /*
 305          * Since going into a recovery state causes the link state to go
 306          * down and since recovery is transitory, it is better if we "miss"
 307          * ever seeing the link training state go into recovery (i.e.,
 308          * ignore this transition for link state special handling purposes)
 309          * without even updating ipath_lastibcstat.
 310          */
 311         if ((ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN) ||
 312             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT) ||
 313             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERIDLE))
 314                 goto done;
 315
 316         /*
 317          * if linkstate transitions into INIT from any of the various down
 318          * states, or if it transitions from any of the up (INIT or better)
 319          * states into any of the down states (except link recovery), then
 320          * call the chip-specific code to take appropriate actions.
 321          */
 322         if (lstate >= INFINIPATH_IBCS_L_STATE_INIT &&
 323                 lastlstate == INFINIPATH_IBCS_L_STATE_DOWN) {
 324                 /* transitioned to UP */
 325                 if (dd->ipath_f_ib_updown(dd, 1, ibcs)) {
 326                         /* link came up, so we must no longer be disabled */
 327                         dd->ipath_flags &= ~IPATH_IB_LINK_DISABLED;
 328                         ipath_cdbg(LINKVERB, "LinkUp handled, skipped\n");
 329                         goto skip_ibchange; /* chip-code handled */
 330                 }
 331         } else if ((lastlstate >= INFINIPATH_IBCS_L_STATE_INIT ||
 332                 (dd->ipath_flags & IPATH_IB_FORCE_NOTIFY)) &&
 333                 ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT &&
 334                 ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
 335                 int handled;
 336                 handled = dd->ipath_f_ib_updown(dd, 0, ibcs);
 337                 dd->ipath_flags &= ~IPATH_IB_FORCE_NOTIFY;
 338                 if (handled) {
 339                         ipath_cdbg(LINKVERB, "LinkDown handled, skipped\n");
 340                         goto skip_ibchange; /* chip-code handled */
 341                 }
 342         }
 343
 344         /*
 345          * Significant enough to always print and get into logs, if it was
 346          * unexpected.  If it was a requested state change, we'll have
 347          * already cleared the flags, so we won't print this warning
 348          */
 349         if ((ibstate != arm && ibstate != active) &&
 350             (dd->ipath_flags & (IPATH_LINKARMED | IPATH_LINKACTIVE))) {
 351                 dev_info(&dd->pcidev->dev, "Link state changed from %s "
 352                          "to %s\n", (dd->ipath_flags & IPATH_LINKARMED) ?
 353                          "ARM" : "ACTIVE", ib_linkstate(dd, ibcs));
 354         }
 355
 356         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 357             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 358                 u32 lastlts;
 359                 lastlts = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
 360                 /*
 361                  * Ignore cycling back and forth from Polling.Active to
 362                  * Polling.Quiet while waiting for the other end of the link
 363                  * to come up, except to try and decide if we are connected
 364                  * to a live IB device or not.  We will cycle back and
 365                  * forth between them if no cable is plugged in, the other
 366                  * device is powered off or disabled, etc.
 367                  */
 368                 if (lastlts == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 369                     lastlts == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 370                         if (!(dd->ipath_flags & IPATH_IB_AUTONEG_INPROG) &&
 371                              (++dd->ipath_ibpollcnt == 40)) {
 372                                 dd->ipath_flags |= IPATH_NOCABLE;
 373                                 *dd->ipath_statusp |=
 374                                         IPATH_STATUS_IB_NOCABLE;
 375                                 ipath_cdbg(LINKVERB, "Set NOCABLE\n");
 376                         }
 377                         ipath_cdbg(LINKVERB, "POLL change to %s (%x)\n",
 378                                 ipath_ibcstatus_str[ltstate], ibstate);
 379                         goto skip_ibchange;
 380                 }
 381         }
 382
 383         dd->ipath_ibpollcnt = 0; /* not poll*, now */
 384         ipath_stats.sps_iblink++;
 385
 386         if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
 387                 u64 linkrecov;
 388                 linkrecov = ipath_snap_cntr(dd,
 389                         dd->ipath_cregs->cr_iblinkerrrecovcnt);
 390                 if (linkrecov != dd->ipath_lastlinkrecov) {
 391                         ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
 392                                 ibcs, ib_linkstate(dd, ibcs),
 393                                 ipath_ibcstatus_str[ltstate],
 394                                 linkrecov);
 395                         /* and no more until active again */
 396                         dd->ipath_lastlinkrecov = 0;
 397                         ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
 398                         goto skip_ibchange;
 399                 }
 400         }
 401
 402         if (ibstate == init || ibstate == arm || ibstate == active) {
 403                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
 404                 if (ibstate == init || ibstate == arm) {
 405                         *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 406                         if (dd->ipath_flags & IPATH_LINKACTIVE)
 407                                 signal_ib_event(dd, IB_EVENT_PORT_ERR);
 408                 }
 409                 if (ibstate == arm) {
 410                         dd->ipath_flags |= IPATH_LINKARMED;
 411                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 412                                 IPATH_LINKINIT | IPATH_LINKDOWN |
 413                                 IPATH_LINKACTIVE | IPATH_NOCABLE);
 414                         ipath_hol_down(dd);
 415                 } else  if (ibstate == init) {
 416                         /*
 417                          * set INIT and DOWN.  Down is checked by
 418                          * most of the other code, but INIT is
 419                          * useful to know in a few places.
 420                          */
 421                         dd->ipath_flags |= IPATH_LINKINIT |
 422                                 IPATH_LINKDOWN;
 423                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 424                                 IPATH_LINKARMED | IPATH_LINKACTIVE |
 425                                 IPATH_NOCABLE);
 426                         ipath_hol_down(dd);
 427                 } else {  /* active */
 428                         dd->ipath_lastlinkrecov = ipath_snap_cntr(dd,
 429                                 dd->ipath_cregs->cr_iblinkerrrecovcnt);
 430                         *dd->ipath_statusp |=
 431                                 IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
 432                         dd->ipath_flags |= IPATH_LINKACTIVE;
 433                         dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 434                                 | IPATH_LINKDOWN | IPATH_LINKARMED |
 435                                 IPATH_NOCABLE);
 436                         signal_ib_event(dd, IB_EVENT_PORT_ACTIVE);
 437                         /* LED active not handled in chip _f_updown */
 438                         dd->ipath_f_setextled(dd, lstate, ltstate);
 439                         ipath_hol_up(dd);
 440                 }
 441
 442                 /*
 443                  * print after we've already done the work, so as not to
 444                  * delay the state changes and notifications, for debugging
 445                  */
 446                 if (lstate == lastlstate)
 447                         ipath_cdbg(LINKVERB, "Unchanged from last: %s "
 448                                 "(%x)\n", ib_linkstate(dd, ibcs), ibstate);
 449                 else
 450                         ipath_cdbg(VERBOSE, "Unit %u: link up to %s %s (%x)\n",
 451                                   dd->ipath_unit, ib_linkstate(dd, ibcs),
 452                                   ipath_ibcstatus_str[ltstate],  ibstate);
 453         } else { /* down */
 454                 if (dd->ipath_flags & IPATH_LINKACTIVE)
 455                         signal_ib_event(dd, IB_EVENT_PORT_ERR);
 456                 dd->ipath_flags |= IPATH_LINKDOWN;
 457                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 458                                      | IPATH_LINKACTIVE |
 459                                      IPATH_LINKARMED);
 460                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 461                 dd->ipath_lli_counter = 0;
 462
 463                 if (lastlstate != INFINIPATH_IBCS_L_STATE_DOWN)
 464                         ipath_cdbg(VERBOSE, "Unit %u link state down "
 465                                    "(state 0x%x), from %s\n",
 466                                    dd->ipath_unit, lstate,
 467                                    ib_linkstate(dd, dd->ipath_lastibcstat));
 468                 else
 469                         ipath_cdbg(LINKVERB, "Unit %u link state changed "
 470                                    "to %s (0x%x) from down (%x)\n",
 471                                    dd->ipath_unit,
 472                                    ipath_ibcstatus_str[ltstate],
 473                                    ibstate, lastlstate);
 474         }
 475
 476 skip_ibchange:
 477         dd->ipath_lastibcstat = ibcs;
 478 done:
 479         return;
 480 }
 481
 482 static void handle_supp_msgs(struct ipath_devdata *dd,
 483                              unsigned supp_msgs, char *msg, int msgsz)
 484 {
 485         /*
 486          * Print the message unless it's ibc status change only, which
 487          * happens so often we never want to count it.
 488          */
 489         if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
 490                 int iserr;
 491                 iserr = ipath_decode_err(msg, msgsz,
 492                                          dd->ipath_lasterror &
 493                                          ~INFINIPATH_E_IBSTATUSCHANGED);
 494                 if (dd->ipath_lasterror &
 495                         ~(INFINIPATH_E_RRCVEGRFULL |
 496                         INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
 497                         ipath_dev_err(dd, "Suppressed %u messages for "
 498                                       "fast-repeating errors (%s) (%llx)\n",
 499                                       supp_msgs, msg,
 500                                       (unsigned long long)
 501                                       dd->ipath_lasterror);
 502                 else {
 503                         /*
 504                          * rcvegrfull and rcvhdrqfull are "normal", for some
 505                          * types of processes (mostly benchmarks) that send
 506                          * huge numbers of messages, while not processing
 507                          * them. So only complain about these at debug
 508                          * level.
 509                          */
 510                         if (iserr)
 511                                 ipath_dbg("Suppressed %u messages for %s\n",
 512                                           supp_msgs, msg);
 513                         else
 514                                 ipath_cdbg(ERRPKT,
 515                                         "Suppressed %u messages for %s\n",
 516                                           supp_msgs, msg);
 517                 }
 518         }
 519 }
 520
 521 static unsigned handle_frequent_errors(struct ipath_devdata *dd,
 522                                        ipath_err_t errs, char *msg,
 523                                        int msgsz, int *noprint)
 524 {
 525         unsigned long nc;
 526         static unsigned long nextmsg_time;
 527         static unsigned nmsgs, supp_msgs;
 528
 529         /*
 530          * Throttle back "fast" messages to no more than 10 per 5 seconds.
 531          * This isn't perfect, but it's a reasonable heuristic. If we get
 532          * more than 10, give a 6x longer delay.
 533          */
 534         nc = jiffies;
 535         if (nmsgs > 10) {
 536                 if (time_before(nc, nextmsg_time)) {
 537                         *noprint = 1;
 538                         if (!supp_msgs++)
 539                                 nextmsg_time = nc + HZ * 3;
 540                 }
 541                 else if (supp_msgs) {
 542                         handle_supp_msgs(dd, supp_msgs, msg, msgsz);
 543                         supp_msgs = 0;
 544                         nmsgs = 0;
 545                 }
 546         }
 547         else if (!nmsgs++ || time_after(nc, nextmsg_time))
 548                 nextmsg_time = nc + HZ / 2;
 549
 550         return supp_msgs;
 551 }
 552
 553 static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
 554 {
 555         char msg[128];
 556         u64 ignore_this_time = 0;
 557         int i, iserr = 0;
 558         int chkerrpkts = 0, noprint = 0;
 559         unsigned supp_msgs;
 560         int log_idx;
 561
 562         supp_msgs = handle_frequent_errors(dd, errs, msg, sizeof msg, &noprint);
 563
 564         /* don't report errors that are masked */
 565         errs &= ~dd->ipath_maskederrs;
 566
 567         /* do these first, they are most important */
 568         if (errs & INFINIPATH_E_HARDWARE) {
 569                 /* reuse same msg buf */
 570                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
 571         } else {
 572                 u64 mask;
 573                 for (log_idx = 0; log_idx < IPATH_EEP_LOG_CNT; ++log_idx) {
 574                         mask = dd->ipath_eep_st_masks[log_idx].errs_to_log;
 575                         if (errs & mask)
 576                                 ipath_inc_eeprom_err(dd, log_idx, 1);
 577                 }
 578         }
 579
 580         if (!noprint && (errs & ~dd->ipath_e_bitsextant))
 581                 ipath_dev_err(dd, "error interrupt with unknown errors "
 582                               "%llx set\n", (unsigned long long)
 583                               (errs & ~dd->ipath_e_bitsextant));
 584
 585         if (errs & E_SUM_ERRS)
 586                 ignore_this_time = handle_e_sum_errs(dd, errs);
 587         else if ((errs & E_SUM_LINK_PKTERRS) &&
 588             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 589                 /*
 590                  * This can happen when SMA is trying to bring the link
 591                  * up, but the IB link changes state at the "wrong" time.
 592                  * The IB logic then complains that the packet isn't
 593                  * valid.  We don't want to confuse people, so we just
 594                  * don't print them, except at debug
 595                  */
 596                 ipath_dbg("Ignoring packet errors %llx, because link not "
 597                           "ACTIVE\n", (unsigned long long) errs);
 598                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 599         }
 600
 601         if (supp_msgs == 250000) {
 602                 int s_iserr;
 603                 /*
 604                  * It's not entirely reasonable assuming that the errors set
 605                  * in the last clear period are all responsible for the
 606                  * problem, but the alternative is to assume it's the only
 607                  * ones on this particular interrupt, which also isn't great
 608                  */
 609                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
 610
 611                 dd->ipath_errormask &= ~dd->ipath_maskederrs;
 612                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 613                                  dd->ipath_errormask);
 614                 s_iserr = ipath_decode_err(msg, sizeof msg,
 615                                            dd->ipath_maskederrs);
 616
 617                 if (dd->ipath_maskederrs &
 618                     ~(INFINIPATH_E_RRCVEGRFULL |
 619                       INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
 620                         ipath_dev_err(dd, "Temporarily disabling "
 621                             "error(s) %llx reporting; too frequent (%s)\n",
 622                                 (unsigned long long) dd->ipath_maskederrs,
 623                                 msg);
 624                 else {
 625                         /*
 626                          * rcvegrfull and rcvhdrqfull are "normal",
 627                          * for some types of processes (mostly benchmarks)
 628                          * that send huge numbers of messages, while not
 629                          * processing them.  So only complain about
 630                          * these at debug level.
 631                          */
 632                         if (s_iserr)
 633                                 ipath_dbg("Temporarily disabling reporting "
 634                                     "too frequent queue full errors (%s)\n",
 635                                     msg);
 636                         else
 637                                 ipath_cdbg(ERRPKT,
 638                                     "Temporarily disabling reporting too"
 639                                     " frequent packet errors (%s)\n",
 640                                     msg);
 641                 }
 642
 643                 /*
 644                  * Re-enable the masked errors after around 3 minutes.  in
 645                  * ipath_get_faststats().  If we have a series of fast
 646                  * repeating but different errors, the interval will keep
 647                  * stretching out, but that's OK, as that's pretty
 648                  * catastrophic.
 649                  */
 650                 dd->ipath_unmasktime = jiffies + HZ * 180;
 651         }
 652
 653         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
 654         if (ignore_this_time)
 655                 errs &= ~ignore_this_time;
 656         if (errs & ~dd->ipath_lasterror) {
 657                 errs &= ~dd->ipath_lasterror;
 658                 /* never suppress duplicate hwerrors or ibstatuschange */
 659                 dd->ipath_lasterror |= errs &
 660                         ~(INFINIPATH_E_HARDWARE |
 661                           INFINIPATH_E_IBSTATUSCHANGED);
 662         }
 663
 664         /* likely due to cancel, so suppress */
 665         if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
 666                 dd->ipath_lastcancel > jiffies) {
 667                 ipath_dbg("Suppressed armlaunch/spktlen after error send cancel\n");
 668                 errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
 669         }
 670
 671         if (!errs)
 672                 return 0;
 673
 674         if (!noprint)
 675                 /*
 676                  * the ones we mask off are handled specially below or above
 677                  */
 678                 ipath_decode_err(msg, sizeof msg,
 679                                  errs & ~(INFINIPATH_E_IBSTATUSCHANGED |
 680                                           INFINIPATH_E_RRCVEGRFULL |
 681                                           INFINIPATH_E_RRCVHDRFULL |
 682                                           INFINIPATH_E_HARDWARE));
 683         else
 684                 /* so we don't need if (!noprint) at strlcat's below */
 685                 *msg = 0;
 686
 687         if (errs & E_SUM_PKTERRS) {
 688                 ipath_stats.sps_pkterrs++;
 689                 chkerrpkts = 1;
 690         }
 691         if (errs & E_SUM_ERRS)
 692                 ipath_stats.sps_errs++;
 693
 694         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
 695                 ipath_stats.sps_crcerrs++;
 696                 chkerrpkts = 1;
 697         }
 698         iserr = errs & ~(E_SUM_PKTERRS | INFINIPATH_E_PKTERRS);
 699
 700
 701         /*
 702          * We don't want to print these two as they happen, or we can make
 703          * the situation even worse, because it takes so long to print
 704          * messages to serial consoles.  Kernel ports get printed from
 705          * fast_stats, no more than every 5 seconds, user ports get printed
 706          * on close
 707          */
 708         if (errs & INFINIPATH_E_RRCVHDRFULL) {
 709                 u32 hd, tl;
 710                 ipath_stats.sps_hdrqfull++;
 711                 for (i = 0; i < dd->ipath_cfgports; i++) {
 712                         struct ipath_portdata *pd = dd->ipath_pd[i];
 713                         if (i == 0) {
 714                                 hd = pd->port_head;
 715                                 tl = ipath_get_hdrqtail(pd);
 716                         } else if (pd && pd->port_cnt &&
 717                                    pd->port_rcvhdrtail_kvaddr) {
 718                                 /*
 719                                  * don't report same point multiple times,
 720                                  * except kernel
 721                                  */
 722                                 tl = *(u64 *) pd->port_rcvhdrtail_kvaddr;
 723                                 if (tl == pd->port_lastrcvhdrqtail)
 724                                         continue;
 725                                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead,
 726                                                        i);
 727                         } else
 728                                 continue;
 729                         if (hd == (tl + 1) ||
 730                             (!hd && tl == dd->ipath_hdrqlast)) {
 731                                 if (i == 0)
 732                                         chkerrpkts = 1;
 733                                 pd->port_lastrcvhdrqtail = tl;
 734                                 pd->port_hdrqfull++;
 735                                 /* flush hdrqfull so that poll() sees it */
 736                                 wmb();
 737                                 wake_up_interruptible(&pd->port_wait);
 738                         }
 739                 }
 740         }
 741         if (errs & INFINIPATH_E_RRCVEGRFULL) {
 742                 struct ipath_portdata *pd = dd->ipath_pd[0];
 743
 744                 /*
 745                  * since this is of less importance and not likely to
 746                  * happen without also getting hdrfull, only count
 747                  * occurrences; don't check each port (or even the kernel
 748                  * vs user)
 749                  */
 750                 ipath_stats.sps_etidfull++;
 751                 if (pd->port_head != ipath_get_hdrqtail(pd))
 752                         chkerrpkts = 1;
 753         }
 754
 755         /*
 756          * do this before IBSTATUSCHANGED, in case both bits set in a single
 757          * interrupt; we want the STATUSCHANGE to "win", so we do our
 758          * internal copy of state machine correctly
 759          */
 760         if (errs & INFINIPATH_E_RIBLOSTLINK) {
 761                 /*
 762                  * force through block below
 763                  */
 764                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
 765                 ipath_stats.sps_iblink++;
 766                 dd->ipath_flags |= IPATH_LINKDOWN;
 767                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 768                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
 769                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 770
 771                 ipath_dbg("Lost link, link now down (%s)\n",
 772                         ipath_ibcstatus_str[ipath_read_kreg64(dd,
 773                         dd->ipath_kregs->kr_ibcstatus) & 0xf]);
 774         }
 775         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
 776                 handle_e_ibstatuschanged(dd, errs);
 777
 778         if (errs & INFINIPATH_E_RESET) {
 779                 if (!noprint)
 780                         ipath_dev_err(dd, "Got reset, requires re-init "
 781                                       "(unload and reload driver)\n");
 782                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
 783                 /* mark as having had error */
 784                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 785                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
 786         }
 787
 788         if (!noprint && *msg) {
 789                 if (iserr)
 790                         ipath_dev_err(dd, "%s error\n", msg);
 791                 else
 792                         dev_info(&dd->pcidev->dev, "%s packet problems\n",
 793                                 msg);
 794         }
 795         if (dd->ipath_state_wanted & dd->ipath_flags) {
 796                 ipath_cdbg(VERBOSE, "driver wanted state %x, iflags now %x, "
 797                            "waking\n", dd->ipath_state_wanted,
 798                            dd->ipath_flags);
 799                 wake_up_interruptible(&ipath_state_wait);
 800         }
 801
 802         return chkerrpkts;
 803 }
 804
 805 /*
 806  * try to cleanup as much as possible for anything that might have gone
 807  * wrong while in freeze mode, such as pio buffers being written by user
 808  * processes (causing armlaunch), send errors due to going into freeze mode,
 809  * etc., and try to avoid causing extra interrupts while doing so.
 810  * Forcibly update the in-memory pioavail register copies after cleanup
 811  * because the chip won't do it for anything changing while in freeze mode
 812  * (we don't want to wait for the next pio buffer state change).
 813  * Make sure that we don't lose any important interrupts by using the chip
 814  * feature that says that writing 0 to a bit in *clear that is set in
 815  * *status will cause an interrupt to be generated again (if allowed by
 816  * the *mask value).
 817  */
 818 void ipath_clear_freeze(struct ipath_devdata *dd)
 819 {
 820         int i, im;
 821         u64 val;
 822
 823         /* disable error interrupts, to avoid confusion */
 824         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask, 0ULL);
 825
 826         /* also disable interrupts; errormask is sometimes overwriten */
 827         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 828
 829         /*
 830          * clear all sends, because they have may been
 831          * completed by usercode while in freeze mode, and
 832          * therefore would not be sent, and eventually
 833          * might cause the process to run out of bufs
 834          */
 835         ipath_cancel_sends(dd, 0);
 836         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 837                          dd->ipath_control);
 838
 839         /* ensure pio avail updates continue */
 840         ipath_force_pio_avail_update(dd);
 841
 842         /*
 843          * We just enabled pioavailupdate, so dma copy is almost certainly
 844          * not yet right, so read the registers directly.  Similar to init
 845          */
 846         for (i = 0; i < dd->ipath_pioavregs; i++) {
 847                 /* deal with 6110 chip bug */
 848                 im = (i > 3 && (dd->ipath_flags & IPATH_SWAP_PIOBUFS)) ?
 849                         i ^ 1 : i;
 850                 val = ipath_read_kreg64(dd, (0x1000 / sizeof(u64)) + im);
 851                 dd->ipath_pioavailregs_dma[i] = cpu_to_le64(val);
 852                 dd->ipath_pioavailshadow[i] = val |
 853                         (~dd->ipath_pioavailkernel[i] <<
 854                         INFINIPATH_SENDPIOAVAIL_BUSY_SHIFT);
 855         }
 856
 857         /*
 858          * force new interrupt if any hwerr, error or interrupt bits are
 859          * still set, and clear "safe" send packet errors related to freeze
 860          * and cancelling sends.  Re-enable error interrupts before possible
 861          * force of re-interrupt on pending interrupts.
 862          */
 863         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
 864         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 865                 E_SPKT_ERRS_IGNORE);
 866         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 867                 dd->ipath_errormask);
 868         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, -1LL);
 869         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 870 }
 871
 872
 873 /* this is separate to allow for better optimization of ipath_intr() */
 874
 875 static noinline void ipath_bad_intr(struct ipath_devdata *dd, u32 *unexpectp)
 876 {
 877         /*
 878          * sometimes happen during driver init and unload, don't want
 879          * to process any interrupts at that point
 880          */
 881
 882         /* this is just a bandaid, not a fix, if something goes badly
 883          * wrong */
 884         if (++*unexpectp > 100) {
 885                 if (++*unexpectp > 105) {
 886                         /*
 887                          * ok, we must be taking somebody else's interrupts,
 888                          * due to a messed up mptable and/or PIRQ table, so
 889                          * unregister the interrupt.  We've seen this during
 890                          * linuxbios development work, and it may happen in
 891                          * the future again.
 892                          */
 893                         if (dd->pcidev && dd->ipath_irq) {
 894                                 ipath_dev_err(dd, "Now %u unexpected "
 895                                               "interrupts, unregistering "
 896                                               "interrupt handler\n",
 897                                               *unexpectp);
 898                                 ipath_dbg("free_irq of irq %d\n",
 899                                           dd->ipath_irq);
 900                                 dd->ipath_f_free_irq(dd);
 901                         }
 902                 }
 903                 if (ipath_read_ireg(dd, dd->ipath_kregs->kr_intmask)) {
 904                         ipath_dev_err(dd, "%u unexpected interrupts, "
 905                                       "disabling interrupts completely\n",
 906                                       *unexpectp);
 907                         /*
 908                          * disable all interrupts, something is very wrong
 909                          */
 910                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 911                                          0ULL);
 912                 }
 913         } else if (*unexpectp > 1)
 914                 ipath_dbg("Interrupt when not ready, should not happen, "
 915                           "ignoring\n");
 916 }
 917
 918 static noinline void ipath_bad_regread(struct ipath_devdata *dd)
 919 {
 920         static int allbits;
 921
 922         /* separate routine, for better optimization of ipath_intr() */
 923
 924         /*
 925          * We print the message and disable interrupts, in hope of
 926          * having a better chance of debugging the problem.
 927          */
 928         ipath_dev_err(dd,
 929                       "Read of interrupt status failed (all bits set)\n");
 930         if (allbits++) {
 931                 /* disable all interrupts, something is very wrong */
 932                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 933                 if (allbits == 2) {
 934                         ipath_dev_err(dd, "Still bad interrupt status, "
 935                                       "unregistering interrupt\n");
 936                         dd->ipath_f_free_irq(dd);
 937                 } else if (allbits > 2) {
 938                         if ((allbits % 10000) == 0)
 939                                 printk(".");
 940                 } else
 941                         ipath_dev_err(dd, "Disabling interrupts, "
 942                                       "multiple errors\n");
 943         }
 944 }
 945
 946 static void handle_layer_pioavail(struct ipath_devdata *dd)
 947 {
 948         unsigned long flags;
 949         int ret;
 950
 951         ret = ipath_ib_piobufavail(dd->verbs_dev);
 952         if (ret > 0)
 953                 goto set;
 954
 955         return;
 956 set:
 957         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
 958         dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL;
 959         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 960                          dd->ipath_sendctrl);
 961         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 962         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
 963 }
 964
 965 /*
 966  * Handle receive interrupts for user ports; this means a user
 967  * process was waiting for a packet to arrive, and didn't want
 968  * to poll
 969  */
 970 static void handle_urcv(struct ipath_devdata *dd, u64 istat)
 971 {
 972         u64 portr;
 973         int i;
 974         int rcvdint = 0;
 975
 976         /*
 977          * test_and_clear_bit(IPATH_PORT_WAITING_RCV) and
 978          * test_and_clear_bit(IPATH_PORT_WAITING_URG) below
 979          * would both like timely updates of the bits so that
 980          * we don't pass them by unnecessarily.  the rmb()
 981          * here ensures that we see them promptly -- the
 982          * corresponding wmb()'s are in ipath_poll_urgent()
 983          * and ipath_poll_next()...
 984          */
 985         rmb();
 986         portr = ((istat >> dd->ipath_i_rcvavail_shift) &
 987                  dd->ipath_i_rcvavail_mask) |
 988                 ((istat >> dd->ipath_i_rcvurg_shift) &
 989                  dd->ipath_i_rcvurg_mask);
 990         for (i = 1; i < dd->ipath_cfgports; i++) {
 991                 struct ipath_portdata *pd = dd->ipath_pd[i];
 992
 993                 if (portr & (1 << i) && pd && pd->port_cnt) {
 994                         if (test_and_clear_bit(IPATH_PORT_WAITING_RCV,
 995                                                &pd->port_flag)) {
 996                                 clear_bit(i + dd->ipath_r_intravail_shift,
 997                                           &dd->ipath_rcvctrl);
 998                                 wake_up_interruptible(&pd->port_wait);
 999                                 rcvdint = 1;
1000                         } else if (test_and_clear_bit(IPATH_PORT_WAITING_URG,
1001                                                       &pd->port_flag)) {
1002                                 pd->port_urgent++;
1003                                 wake_up_interruptible(&pd->port_wait);
1004                         }
1005                 }
1006         }
1007         if (rcvdint) {
1008                 /* only want to take one interrupt, so turn off the rcv
1009                  * interrupt for all the ports that we set the rcv_waiting
1010                  * (but never for kernel port)
1011                  */
1012                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1013                                  dd->ipath_rcvctrl);
1014         }
1015 }
1016
1017 irqreturn_t ipath_intr(int irq, void *data)
1018 {
1019         struct ipath_devdata *dd = data;
1020         u32 istat, chk0rcv = 0;
1021         ipath_err_t estat = 0;
1022         irqreturn_t ret;
1023         static unsigned unexpected = 0;
1024         u64 kportrbits;
1025
1026         ipath_stats.sps_ints++;
1027
1028         if (dd->ipath_int_counter != (u32) -1)
1029                 dd->ipath_int_counter++;
1030
1031         if (!(dd->ipath_flags & IPATH_PRESENT)) {
1032                 /*
1033                  * This return value is not great, but we do not want the
1034                  * interrupt core code to remove our interrupt handler
1035                  * because we don't appear to be handling an interrupt
1036                  * during a chip reset.
1037                  */
1038                 return IRQ_HANDLED;
1039         }
1040
1041         /*
1042          * this needs to be flags&initted, not statusp, so we keep
1043          * taking interrupts even after link goes down, etc.
1044          * Also, we *must* clear the interrupt at some point, or we won't
1045          * take it again, which can be real bad for errors, etc...
1046          */
1047
1048         if (!(dd->ipath_flags & IPATH_INITTED)) {
1049                 ipath_bad_intr(dd, &unexpected);
1050                 ret = IRQ_NONE;
1051                 goto bail;
1052         }
1053
1054         istat = ipath_read_ireg(dd, dd->ipath_kregs->kr_intstatus);
1055
1056         if (unlikely(!istat)) {
1057                 ipath_stats.sps_nullintr++;
1058                 ret = IRQ_NONE; /* not our interrupt, or already handled */
1059                 goto bail;
1060         }
1061         if (unlikely(istat == -1)) {
1062                 ipath_bad_regread(dd);
1063                 /* don't know if it was our interrupt or not */
1064                 ret = IRQ_NONE;
1065                 goto bail;
1066         }
1067
1068         if (unexpected)
1069                 unexpected = 0;
1070
1071         if (unlikely(istat & ~dd->ipath_i_bitsextant))
1072                 ipath_dev_err(dd,
1073                               "interrupt with unknown interrupts %x set\n",
1074                               istat & (u32) ~ dd->ipath_i_bitsextant);
1075         else
1076                 ipath_cdbg(VERBOSE, "intr stat=0x%x\n", istat);
1077
1078         if (unlikely(istat & INFINIPATH_I_ERROR)) {
1079                 ipath_stats.sps_errints++;
1080                 estat = ipath_read_kreg64(dd,
1081                                           dd->ipath_kregs->kr_errorstatus);
1082                 if (!estat)
1083                         dev_info(&dd->pcidev->dev, "error interrupt (%x), "
1084                                  "but no error bits set!\n", istat);
1085                 else if (estat == -1LL)
1086                         /*
1087                          * should we try clearing all, or hope next read
1088                          * works?
1089                          */
1090                         ipath_dev_err(dd, "Read of error status failed "
1091                                       "(all bits set); ignoring\n");
1092                 else
1093                         chk0rcv |= handle_errors(dd, estat);
1094         }
1095
1096         if (istat & INFINIPATH_I_GPIO) {
1097                 /*
1098                  * GPIO interrupts fall in two broad classes:
1099                  * GPIO_2 indicates (on some HT4xx boards) that a packet
1100                  *        has arrived for Port 0. Checking for this
1101                  *        is controlled by flag IPATH_GPIO_INTR.
1102                  * GPIO_3..5 on IBA6120 Rev2 and IBA6110 Rev4 chips indicate
1103                  *        errors that we need to count. Checking for this
1104                  *        is controlled by flag IPATH_GPIO_ERRINTRS.
1105                  */
1106                 u32 gpiostatus;
1107                 u32 to_clear = 0;
1108
1109                 gpiostatus = ipath_read_kreg32(
1110                         dd, dd->ipath_kregs->kr_gpio_status);
1111                 /* First the error-counter case. */
1112                 if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) &&
1113                     (dd->ipath_flags & IPATH_GPIO_ERRINTRS)) {
1114                         /* want to clear the bits we see asserted. */
1115                         to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK);
1116
1117                         /*
1118                          * Count appropriately, clear bits out of our copy,
1119                          * as they have been "handled".
1120                          */
1121                         if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) {
1122                                 ipath_dbg("FlowCtl on UnsupVL\n");
1123                                 dd->ipath_rxfc_unsupvl_errs++;
1124                         }
1125                         if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) {
1126                                 ipath_dbg("Overrun Threshold exceeded\n");
1127                                 dd->ipath_overrun_thresh_errs++;
1128                         }
1129                         if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) {
1130                                 ipath_dbg("Local Link Integrity error\n");
1131                                 dd->ipath_lli_errs++;
1132                         }
1133                         gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK;
1134                 }
1135                 /* Now the Port0 Receive case */
1136                 if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) &&
1137                     (dd->ipath_flags & IPATH_GPIO_INTR)) {
1138                         /*
1139                          * GPIO status bit 2 is set, and we expected it.
1140                          * clear it and indicate in p0bits.
1141                          * This probably only happens if a Port0 pkt
1142                          * arrives at _just_ the wrong time, and we
1143                          * handle that by seting chk0rcv;
1144                          */
1145                         to_clear |= (1 << IPATH_GPIO_PORT0_BIT);
1146                         gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT);
1147                         chk0rcv = 1;
1148                 }
1149                 if (gpiostatus) {
1150                         /*
1151                          * Some unexpected bits remain. If they could have
1152                          * caused the interrupt, complain and clear.
1153                          * To avoid repetition of this condition, also clear
1154                          * the mask. It is almost certainly due to error.
1155                          */
1156                         const u32 mask = (u32) dd->ipath_gpio_mask;
1157
1158                         if (mask & gpiostatus) {
1159                                 ipath_dbg("Unexpected GPIO IRQ bits %x\n",
1160                                   gpiostatus & mask);
1161                                 to_clear |= (gpiostatus & mask);
1162                                 dd->ipath_gpio_mask &= ~(gpiostatus & mask);
1163                                 ipath_write_kreg(dd,
1164                                         dd->ipath_kregs->kr_gpio_mask,
1165                                         dd->ipath_gpio_mask);
1166                         }
1167                 }
1168                 if (to_clear) {
1169                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
1170                                         (u64) to_clear);
1171                 }
1172         }
1173
1174         /*
1175          * Clear the interrupt bits we found set, unless they are receive
1176          * related, in which case we already cleared them above, and don't
1177          * want to clear them again, because we might lose an interrupt.
1178          * Clear it early, so we "know" know the chip will have seen this by
1179          * the time we process the queue, and will re-interrupt if necessary.
1180          * The processor itself won't take the interrupt again until we return.
1181          */
1182         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
1183
1184         /*
1185          * Handle kernel receive queues before checking for pio buffers
1186          * available since receives can overflow; piobuf waiters can afford
1187          * a few extra cycles, since they were waiting anyway, and user's
1188          * waiting for receive are at the bottom.
1189          */
1190         kportrbits = (1ULL << dd->ipath_i_rcvavail_shift) |
1191                 (1ULL << dd->ipath_i_rcvurg_shift);
1192         if (chk0rcv || (istat & kportrbits)) {
1193                 istat &= ~kportrbits;
1194                 ipath_kreceive(dd->ipath_pd[0]);
1195         }
1196
1197         if (istat & ((dd->ipath_i_rcvavail_mask << dd->ipath_i_rcvavail_shift) |
1198                      (dd->ipath_i_rcvurg_mask << dd->ipath_i_rcvurg_shift)))
1199                 handle_urcv(dd, istat);
1200
1201         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
1202                 unsigned long flags;
1203
1204                 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1205                 dd->ipath_sendctrl &= ~INFINIPATH_S_PIOINTBUFAVAIL;
1206                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1207                                  dd->ipath_sendctrl);
1208                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1209                 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1210
1211                 handle_layer_pioavail(dd);
1212         }
1213
1214         ret = IRQ_HANDLED;
1215
1216 bail:
1217         return ret;
1218 }