drivers/infiniband/hw/ipath/ipath_intr.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 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 /*
  43  * Called when we might have an error that is specific to a particular
  44  * PIO buffer, and may need to cancel that buffer, so it can be re-used.
  45  */
  46 void ipath_disarm_senderrbufs(struct ipath_devdata *dd)
  47 {
  48         u32 piobcnt;
  49         unsigned long sbuf[4];
  50         /*
  51          * it's possible that sendbuffererror could have bits set; might
  52          * have already done this as a result of hardware error handling
  53          */
  54         piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
  55         /* read these before writing errorclear */
  56         sbuf[0] = ipath_read_kreg64(
  57                 dd, dd->ipath_kregs->kr_sendbuffererror);
  58         sbuf[1] = ipath_read_kreg64(
  59                 dd, dd->ipath_kregs->kr_sendbuffererror + 1);
  60         if (piobcnt > 128)
  61                 sbuf[2] = ipath_read_kreg64(
  62                         dd, dd->ipath_kregs->kr_sendbuffererror + 2);
  63         if (piobcnt > 192)
  64                 sbuf[3] = ipath_read_kreg64(
  65                         dd, dd->ipath_kregs->kr_sendbuffererror + 3);
  66         else
  67                 sbuf[3] = 0;
  68
  69         if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
  70                 int i;
  71                 if (ipath_debug & (__IPATH_PKTDBG|__IPATH_DBG) &&
  72                         dd->ipath_lastcancel > jiffies) {
  73                         __IPATH_DBG_WHICH(__IPATH_PKTDBG|__IPATH_DBG,
  74                                           "SendbufErrs %lx %lx", sbuf[0],
  75                                           sbuf[1]);
  76                         if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
  77                                 printk(" %lx %lx ", sbuf[2], sbuf[3]);
  78                         printk("\n");
  79                 }
  80
  81                 for (i = 0; i < piobcnt; i++)
  82                         if (test_bit(i, sbuf))
  83                                 ipath_disarm_piobufs(dd, i, 1);
  84                 /* ignore armlaunch errs for a bit */
  85                 dd->ipath_lastcancel = jiffies+3;
  86         }
  87 }
  88
  89
  90 /* These are all rcv-related errors which we want to count for stats */
  91 #define E_SUM_PKTERRS \
  92         (INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
  93          INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
  94          INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
  95          INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
  96          INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
  97          INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
  98
  99 /* These are all send-related errors which we want to count for stats */
 100 #define E_SUM_ERRS \
 101         (INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
 102          INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 103          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
 104          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 105          INFINIPATH_E_INVALIDADDR)
 106
 107 /*
 108  * this is similar to E_SUM_ERRS, but can't ignore armlaunch, don't ignore
 109  * errors not related to freeze and cancelling buffers.  Can't ignore
 110  * armlaunch because could get more while still cleaning up, and need
 111  * to cancel those as they happen.
 112  */
 113 #define E_SPKT_ERRS_IGNORE \
 114          (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 115          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SMINPKTLEN | \
 116          INFINIPATH_E_SPKTLEN)
 117
 118 /*
 119  * these are errors that can occur when the link changes state while
 120  * a packet is being sent or received.  This doesn't cover things
 121  * like EBP or VCRC that can be the result of a sending having the
 122  * link change state, so we receive a "known bad" packet.
 123  */
 124 #define E_SUM_LINK_PKTERRS \
 125         (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 126          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 127          INFINIPATH_E_RSHORTPKTLEN | INFINIPATH_E_RMINPKTLEN | \
 128          INFINIPATH_E_RUNEXPCHAR)
 129
 130 static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
 131 {
 132         u64 ignore_this_time = 0;
 133
 134         ipath_disarm_senderrbufs(dd);
 135         if ((errs & E_SUM_LINK_PKTERRS) &&
 136             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 137                 /*
 138                  * This can happen when SMA is trying to bring the link
 139                  * up, but the IB link changes state at the "wrong" time.
 140                  * The IB logic then complains that the packet isn't
 141                  * valid.  We don't want to confuse people, so we just
 142                  * don't print them, except at debug
 143                  */
 144                 ipath_dbg("Ignoring packet errors %llx, because link not "
 145                           "ACTIVE\n", (unsigned long long) errs);
 146                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 147         }
 148
 149         return ignore_this_time;
 150 }
 151
 152 /* generic hw error messages... */
 153 #define INFINIPATH_HWE_TXEMEMPARITYERR_MSG(a) \
 154         { \
 155                 .mask = ( INFINIPATH_HWE_TXEMEMPARITYERR_##a <<    \
 156                           INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT ),   \
 157                 .msg = "TXE " #a " Memory Parity"            \
 158         }
 159 #define INFINIPATH_HWE_RXEMEMPARITYERR_MSG(a) \
 160         { \
 161                 .mask = ( INFINIPATH_HWE_RXEMEMPARITYERR_##a <<    \
 162                           INFINIPATH_HWE_RXEMEMPARITYERR_SHIFT ),   \
 163                 .msg = "RXE " #a " Memory Parity"            \
 164         }
 165
 166 static const struct ipath_hwerror_msgs ipath_generic_hwerror_msgs[] = {
 167         INFINIPATH_HWE_MSG(IBCBUSFRSPCPARITYERR, "IPATH2IB Parity"),
 168         INFINIPATH_HWE_MSG(IBCBUSTOSPCPARITYERR, "IB2IPATH Parity"),
 169
 170         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOBUF),
 171         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOPBC),
 172         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOLAUNCHFIFO),
 173
 174         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(RCVBUF),
 175         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(LOOKUPQ),
 176         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EAGERTID),
 177         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EXPTID),
 178         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(FLAGBUF),
 179         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(DATAINFO),
 180         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(HDRINFO),
 181 };
 182
 183 /**
 184  * ipath_format_hwmsg - format a single hwerror message
 185  * @msg message buffer
 186  * @msgl length of message buffer
 187  * @hwmsg message to add to message buffer
 188  */
 189 static void ipath_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
 190 {
 191         strlcat(msg, "[", msgl);
 192         strlcat(msg, hwmsg, msgl);
 193         strlcat(msg, "]", msgl);
 194 }
 195
 196 /**
 197  * ipath_format_hwerrors - format hardware error messages for display
 198  * @hwerrs hardware errors bit vector
 199  * @hwerrmsgs hardware error descriptions
 200  * @nhwerrmsgs number of hwerrmsgs
 201  * @msg message buffer
 202  * @msgl message buffer length
 203  */
 204 void ipath_format_hwerrors(u64 hwerrs,
 205                            const struct ipath_hwerror_msgs *hwerrmsgs,
 206                            size_t nhwerrmsgs,
 207                            char *msg, size_t msgl)
 208 {
 209         int i;
 210         const int glen =
 211             sizeof(ipath_generic_hwerror_msgs) /
 212             sizeof(ipath_generic_hwerror_msgs[0]);
 213
 214         for (i=0; i<glen; i++) {
 215                 if (hwerrs & ipath_generic_hwerror_msgs[i].mask) {
 216                         ipath_format_hwmsg(msg, msgl,
 217                                            ipath_generic_hwerror_msgs[i].msg);
 218                 }
 219         }
 220
 221         for (i=0; i<nhwerrmsgs; i++) {
 222                 if (hwerrs & hwerrmsgs[i].mask) {
 223                         ipath_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
 224                 }
 225         }
 226 }
 227
 228 /* return the strings for the most common link states */
 229 static char *ib_linkstate(struct ipath_devdata *dd, u64 ibcs)
 230 {
 231         char *ret;
 232         u32 state;
 233
 234         state = ipath_ib_state(dd, ibcs);
 235         if (state == dd->ib_init)
 236                 ret = "Init";
 237         else if (state == dd->ib_arm)
 238                 ret = "Arm";
 239         else if (state == dd->ib_active)
 240                 ret = "Active";
 241         else
 242                 ret = "Down";
 243         return ret;
 244 }
 245
 246 void signal_ib_event(struct ipath_devdata *dd, enum ib_event_type ev)
 247 {
 248         struct ib_event event;
 249
 250         event.device = &dd->verbs_dev->ibdev;
 251         event.element.port_num = 1;
 252         event.event = ev;
 253         ib_dispatch_event(&event);
 254 }
 255
 256 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 257                                      ipath_err_t errs)
 258 {
 259         u32 ltstate, lstate, ibstate, lastlstate;
 260         u32 init = dd->ib_init;
 261         u32 arm = dd->ib_arm;
 262         u32 active = dd->ib_active;
 263         const u64 ibcs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
 264
 265         lstate = ipath_ib_linkstate(dd, ibcs); /* linkstate */
 266         ibstate = ipath_ib_state(dd, ibcs);
 267         /* linkstate at last interrupt */
 268         lastlstate = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
 269         ltstate = ipath_ib_linktrstate(dd, ibcs); /* linktrainingtate */
 270
 271         /*
 272          * Since going into a recovery state causes the link state to go
 273          * down and since recovery is transitory, it is better if we "miss"
 274          * ever seeing the link training state go into recovery (i.e.,
 275          * ignore this transition for link state special handling purposes)
 276          * without even updating ipath_lastibcstat.
 277          */
 278         if ((ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN) ||
 279             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT) ||
 280             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERIDLE))
 281                 goto done;
 282
 283         /*
 284          * if linkstate transitions into INIT from any of the various down
 285          * states, or if it transitions from any of the up (INIT or better)
 286          * states into any of the down states (except link recovery), then
 287          * call the chip-specific code to take appropriate actions.
 288          */
 289         if (lstate >= INFINIPATH_IBCS_L_STATE_INIT &&
 290                 lastlstate == INFINIPATH_IBCS_L_STATE_DOWN) {
 291                 /* transitioned to UP */
 292                 if (dd->ipath_f_ib_updown(dd, 1, ibcs)) {
 293                         /* link came up, so we must no longer be disabled */
 294                         dd->ipath_flags &= ~IPATH_IB_LINK_DISABLED;
 295                         ipath_cdbg(LINKVERB, "LinkUp handled, skipped\n");
 296                         goto skip_ibchange; /* chip-code handled */
 297                 }
 298         } else if ((lastlstate >= INFINIPATH_IBCS_L_STATE_INIT ||
 299                 (dd->ipath_flags & IPATH_IB_FORCE_NOTIFY)) &&
 300                 ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT &&
 301                 ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
 302                 int handled;
 303                 handled = dd->ipath_f_ib_updown(dd, 0, ibcs);
 304                 dd->ipath_flags &= ~IPATH_IB_FORCE_NOTIFY;
 305                 if (handled) {
 306                         ipath_cdbg(LINKVERB, "LinkDown handled, skipped\n");
 307                         goto skip_ibchange; /* chip-code handled */
 308                 }
 309         }
 310
 311         /*
 312          * Significant enough to always print and get into logs, if it was
 313          * unexpected.  If it was a requested state change, we'll have
 314          * already cleared the flags, so we won't print this warning
 315          */
 316         if ((ibstate != arm && ibstate != active) &&
 317             (dd->ipath_flags & (IPATH_LINKARMED | IPATH_LINKACTIVE))) {
 318                 dev_info(&dd->pcidev->dev, "Link state changed from %s "
 319                          "to %s\n", (dd->ipath_flags & IPATH_LINKARMED) ?
 320                          "ARM" : "ACTIVE", ib_linkstate(dd, ibcs));
 321         }
 322
 323         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 324             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 325                 u32 lastlts;
 326                 lastlts = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
 327                 /*
 328                  * Ignore cycling back and forth from Polling.Active to
 329                  * Polling.Quiet while waiting for the other end of the link
 330                  * to come up, except to try and decide if we are connected
 331                  * to a live IB device or not.  We will cycle back and
 332                  * forth between them if no cable is plugged in, the other
 333                  * device is powered off or disabled, etc.
 334                  */
 335                 if (lastlts == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 336                     lastlts == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 337                         if (!(dd->ipath_flags & IPATH_IB_AUTONEG_INPROG) &&
 338                              (++dd->ipath_ibpollcnt == 40)) {
 339                                 dd->ipath_flags |= IPATH_NOCABLE;
 340                                 *dd->ipath_statusp |=
 341                                         IPATH_STATUS_IB_NOCABLE;
 342                                 ipath_cdbg(LINKVERB, "Set NOCABLE\n");
 343                         }
 344                         ipath_cdbg(LINKVERB, "POLL change to %s (%x)\n",
 345                                 ipath_ibcstatus_str[ltstate], ibstate);
 346                         goto skip_ibchange;
 347                 }
 348         }
 349
 350         dd->ipath_ibpollcnt = 0; /* not poll*, now */
 351         ipath_stats.sps_iblink++;
 352
 353         if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
 354                 u64 linkrecov;
 355                 linkrecov = ipath_snap_cntr(dd,
 356                         dd->ipath_cregs->cr_iblinkerrrecovcnt);
 357                 if (linkrecov != dd->ipath_lastlinkrecov) {
 358                         ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
 359                                 ibcs, ib_linkstate(dd, ibcs),
 360                                 ipath_ibcstatus_str[ltstate],
 361                                 linkrecov);
 362                         /* and no more until active again */
 363                         dd->ipath_lastlinkrecov = 0;
 364                         ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
 365                         goto skip_ibchange;
 366                 }
 367         }
 368
 369         if (ibstate == init || ibstate == arm || ibstate == active) {
 370                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
 371                 if (ibstate == init || ibstate == arm) {
 372                         *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 373                         if (dd->ipath_flags & IPATH_LINKACTIVE)
 374                                 signal_ib_event(dd, IB_EVENT_PORT_ERR);
 375                 }
 376                 if (ibstate == arm) {
 377                         dd->ipath_flags |= IPATH_LINKARMED;
 378                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 379                                 IPATH_LINKINIT | IPATH_LINKDOWN |
 380                                 IPATH_LINKACTIVE | IPATH_NOCABLE);
 381                         ipath_hol_down(dd);
 382                 } else  if (ibstate == init) {
 383                         /*
 384                          * set INIT and DOWN.  Down is checked by
 385                          * most of the other code, but INIT is
 386                          * useful to know in a few places.
 387                          */
 388                         dd->ipath_flags |= IPATH_LINKINIT |
 389                                 IPATH_LINKDOWN;
 390                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 391                                 IPATH_LINKARMED | IPATH_LINKACTIVE |
 392                                 IPATH_NOCABLE);
 393                         ipath_hol_down(dd);
 394                 } else {  /* active */
 395                         dd->ipath_lastlinkrecov = ipath_snap_cntr(dd,
 396                                 dd->ipath_cregs->cr_iblinkerrrecovcnt);
 397                         *dd->ipath_statusp |=
 398                                 IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
 399                         dd->ipath_flags |= IPATH_LINKACTIVE;
 400                         dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 401                                 | IPATH_LINKDOWN | IPATH_LINKARMED |
 402                                 IPATH_NOCABLE);
 403                         if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
 404                                 ipath_restart_sdma(dd);
 405                         signal_ib_event(dd, IB_EVENT_PORT_ACTIVE);
 406                         /* LED active not handled in chip _f_updown */
 407                         dd->ipath_f_setextled(dd, lstate, ltstate);
 408                         ipath_hol_up(dd);
 409                 }
 410
 411                 /*
 412                  * print after we've already done the work, so as not to
 413                  * delay the state changes and notifications, for debugging
 414                  */
 415                 if (lstate == lastlstate)
 416                         ipath_cdbg(LINKVERB, "Unchanged from last: %s "
 417                                 "(%x)\n", ib_linkstate(dd, ibcs), ibstate);
 418                 else
 419                         ipath_cdbg(VERBOSE, "Unit %u: link up to %s %s (%x)\n",
 420                                   dd->ipath_unit, ib_linkstate(dd, ibcs),
 421                                   ipath_ibcstatus_str[ltstate],  ibstate);
 422         } else { /* down */
 423                 if (dd->ipath_flags & IPATH_LINKACTIVE)
 424                         signal_ib_event(dd, IB_EVENT_PORT_ERR);
 425                 dd->ipath_flags |= IPATH_LINKDOWN;
 426                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 427                                      | IPATH_LINKACTIVE |
 428                                      IPATH_LINKARMED);
 429                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 430                 dd->ipath_lli_counter = 0;
 431
 432                 if (lastlstate != INFINIPATH_IBCS_L_STATE_DOWN)
 433                         ipath_cdbg(VERBOSE, "Unit %u link state down "
 434                                    "(state 0x%x), from %s\n",
 435                                    dd->ipath_unit, lstate,
 436                                    ib_linkstate(dd, dd->ipath_lastibcstat));
 437                 else
 438                         ipath_cdbg(LINKVERB, "Unit %u link state changed "
 439                                    "to %s (0x%x) from down (%x)\n",
 440                                    dd->ipath_unit,
 441                                    ipath_ibcstatus_str[ltstate],
 442                                    ibstate, lastlstate);
 443         }
 444
 445 skip_ibchange:
 446         dd->ipath_lastibcstat = ibcs;
 447 done:
 448         return;
 449 }
 450
 451 static void handle_supp_msgs(struct ipath_devdata *dd,
 452                              unsigned supp_msgs, char *msg, u32 msgsz)
 453 {
 454         /*
 455          * Print the message unless it's ibc status change only, which
 456          * happens so often we never want to count it.
 457          */
 458         if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
 459                 int iserr;
 460                 ipath_err_t mask;
 461                 iserr = ipath_decode_err(dd, msg, msgsz,
 462                                          dd->ipath_lasterror &
 463                                          ~INFINIPATH_E_IBSTATUSCHANGED);
 464
 465                 mask = INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 466                         INFINIPATH_E_PKTERRS | INFINIPATH_E_SDMADISABLED;
 467
 468                 /* if we're in debug, then don't mask SDMADISABLED msgs */
 469                 if (ipath_debug & __IPATH_DBG)
 470                         mask &= ~INFINIPATH_E_SDMADISABLED;
 471
 472                 if (dd->ipath_lasterror & ~mask)
 473                         ipath_dev_err(dd, "Suppressed %u messages for "
 474                                       "fast-repeating errors (%s) (%llx)\n",
 475                                       supp_msgs, msg,
 476                                       (unsigned long long)
 477                                       dd->ipath_lasterror);
 478                 else {
 479                         /*
 480                          * rcvegrfull and rcvhdrqfull are "normal", for some
 481                          * types of processes (mostly benchmarks) that send
 482                          * huge numbers of messages, while not processing
 483                          * them. So only complain about these at debug
 484                          * level.
 485                          */
 486                         if (iserr)
 487                                 ipath_dbg("Suppressed %u messages for %s\n",
 488                                           supp_msgs, msg);
 489                         else
 490                                 ipath_cdbg(ERRPKT,
 491                                         "Suppressed %u messages for %s\n",
 492                                           supp_msgs, msg);
 493                 }
 494         }
 495 }
 496
 497 static unsigned handle_frequent_errors(struct ipath_devdata *dd,
 498                                        ipath_err_t errs, char *msg,
 499                                        u32 msgsz, int *noprint)
 500 {
 501         unsigned long nc;
 502         static unsigned long nextmsg_time;
 503         static unsigned nmsgs, supp_msgs;
 504
 505         /*
 506          * Throttle back "fast" messages to no more than 10 per 5 seconds.
 507          * This isn't perfect, but it's a reasonable heuristic. If we get
 508          * more than 10, give a 6x longer delay.
 509          */
 510         nc = jiffies;
 511         if (nmsgs > 10) {
 512                 if (time_before(nc, nextmsg_time)) {
 513                         *noprint = 1;
 514                         if (!supp_msgs++)
 515                                 nextmsg_time = nc + HZ * 3;
 516                 }
 517                 else if (supp_msgs) {
 518                         handle_supp_msgs(dd, supp_msgs, msg, msgsz);
 519                         supp_msgs = 0;
 520                         nmsgs = 0;
 521                 }
 522         }
 523         else if (!nmsgs++ || time_after(nc, nextmsg_time))
 524                 nextmsg_time = nc + HZ / 2;
 525
 526         return supp_msgs;
 527 }
 528
 529 static void handle_sdma_errors(struct ipath_devdata *dd, ipath_err_t errs)
 530 {
 531         unsigned long flags;
 532         int expected;
 533
 534         if (ipath_debug & __IPATH_DBG) {
 535                 char msg[128];
 536                 ipath_decode_err(dd, msg, sizeof msg, errs &
 537                         INFINIPATH_E_SDMAERRS);
 538                 ipath_dbg("errors %lx (%s)\n", (unsigned long)errs, msg);
 539         }
 540         if (ipath_debug & __IPATH_VERBDBG) {
 541                 unsigned long tl, hd, status, lengen;
 542                 tl = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmatail);
 543                 hd = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmahead);
 544                 status = ipath_read_kreg64(dd
 545                         , dd->ipath_kregs->kr_senddmastatus);
 546                 lengen = ipath_read_kreg64(dd,
 547                         dd->ipath_kregs->kr_senddmalengen);
 548                 ipath_cdbg(VERBOSE, "sdma tl 0x%lx hd 0x%lx status 0x%lx "
 549                         "lengen 0x%lx\n", tl, hd, status, lengen);
 550         }
 551
 552         spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 553         __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 554         expected = test_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
 555         spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 556         if (!expected)
 557                 ipath_cancel_sends(dd, 1);
 558 }
 559
 560 static void handle_sdma_intr(struct ipath_devdata *dd, u64 istat)
 561 {
 562         unsigned long flags;
 563         int expected;
 564
 565         if ((istat & INFINIPATH_I_SDMAINT) &&
 566             !test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 567                 ipath_sdma_intr(dd);
 568
 569         if (istat & INFINIPATH_I_SDMADISABLED) {
 570                 expected = test_bit(IPATH_SDMA_ABORTING,
 571                         &dd->ipath_sdma_status);
 572                 ipath_dbg("%s SDmaDisabled intr\n",
 573                         expected ? "expected" : "unexpected");
 574                 spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 575                 __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 576                 spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 577                 if (!expected)
 578                         ipath_cancel_sends(dd, 1);
 579                 if (!test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 580                         tasklet_hi_schedule(&dd->ipath_sdma_abort_task);
 581         }
 582 }
 583
 584 static int handle_hdrq_full(struct ipath_devdata *dd)
 585 {
 586         int chkerrpkts = 0;
 587         u32 hd, tl;
 588         u32 i;
 589
 590         ipath_stats.sps_hdrqfull++;
 591         for (i = 0; i < dd->ipath_cfgports; i++) {
 592                 struct ipath_portdata *pd = dd->ipath_pd[i];
 593
 594                 if (i == 0) {
 595                         /*
 596                          * For kernel receive queues, we just want to know
 597                          * if there are packets in the queue that we can
 598                          * process.
 599                          */
 600                         if (pd->port_head != ipath_get_hdrqtail(pd))
 601                                 chkerrpkts |= 1 << i;
 602                         continue;
 603                 }
 604
 605                 /* Skip if user context is not open */
 606                 if (!pd || !pd->port_cnt)
 607                         continue;
 608
 609                 /* Don't report the same point multiple times. */
 610                 if (dd->ipath_flags & IPATH_NODMA_RTAIL)
 611                         tl = ipath_read_ureg32(dd, ur_rcvhdrtail, i);
 612                 else
 613                         tl = ipath_get_rcvhdrtail(pd);
 614                 if (tl == pd->port_lastrcvhdrqtail)
 615                         continue;
 616
 617                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead, i);
 618                 if (hd == (tl + 1) || (!hd && tl == dd->ipath_hdrqlast)) {
 619                         pd->port_lastrcvhdrqtail = tl;
 620                         pd->port_hdrqfull++;
 621                         /* flush hdrqfull so that poll() sees it */
 622                         wmb();
 623                         wake_up_interruptible(&pd->port_wait);
 624                 }
 625         }
 626
 627         return chkerrpkts;
 628 }
 629
 630 static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
 631 {
 632         char msg[128];
 633         u64 ignore_this_time = 0;
 634         u64 iserr = 0;
 635         int chkerrpkts = 0, noprint = 0;
 636         unsigned supp_msgs;
 637         int log_idx;
 638
 639         /*
 640          * don't report errors that are masked, either at init
 641          * (not set in ipath_errormask), or temporarily (set in
 642          * ipath_maskederrs)
 643          */
 644         errs &= dd->ipath_errormask & ~dd->ipath_maskederrs;
 645
 646         supp_msgs = handle_frequent_errors(dd, errs, msg, (u32)sizeof msg,
 647                 &noprint);
 648
 649         /* do these first, they are most important */
 650         if (errs & INFINIPATH_E_HARDWARE) {
 651                 /* reuse same msg buf */
 652                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
 653         } else {
 654                 u64 mask;
 655                 for (log_idx = 0; log_idx < IPATH_EEP_LOG_CNT; ++log_idx) {
 656                         mask = dd->ipath_eep_st_masks[log_idx].errs_to_log;
 657                         if (errs & mask)
 658                                 ipath_inc_eeprom_err(dd, log_idx, 1);
 659                 }
 660         }
 661
 662         if (errs & INFINIPATH_E_SDMAERRS)
 663                 handle_sdma_errors(dd, errs);
 664
 665         if (!noprint && (errs & ~dd->ipath_e_bitsextant))
 666                 ipath_dev_err(dd, "error interrupt with unknown errors "
 667                               "%llx set\n", (unsigned long long)
 668                               (errs & ~dd->ipath_e_bitsextant));
 669
 670         if (errs & E_SUM_ERRS)
 671                 ignore_this_time = handle_e_sum_errs(dd, errs);
 672         else if ((errs & E_SUM_LINK_PKTERRS) &&
 673             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 674                 /*
 675                  * This can happen when SMA is trying to bring the link
 676                  * up, but the IB link changes state at the "wrong" time.
 677                  * The IB logic then complains that the packet isn't
 678                  * valid.  We don't want to confuse people, so we just
 679                  * don't print them, except at debug
 680                  */
 681                 ipath_dbg("Ignoring packet errors %llx, because link not "
 682                           "ACTIVE\n", (unsigned long long) errs);
 683                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 684         }
 685
 686         if (supp_msgs == 250000) {
 687                 int s_iserr;
 688                 /*
 689                  * It's not entirely reasonable assuming that the errors set
 690                  * in the last clear period are all responsible for the
 691                  * problem, but the alternative is to assume it's the only
 692                  * ones on this particular interrupt, which also isn't great
 693                  */
 694                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
 695
 696                 dd->ipath_errormask &= ~dd->ipath_maskederrs;
 697                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 698                                  dd->ipath_errormask);
 699                 s_iserr = ipath_decode_err(dd, msg, sizeof msg,
 700                                            dd->ipath_maskederrs);
 701
 702                 if (dd->ipath_maskederrs &
 703                     ~(INFINIPATH_E_RRCVEGRFULL |
 704                       INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
 705                         ipath_dev_err(dd, "Temporarily disabling "
 706                             "error(s) %llx reporting; too frequent (%s)\n",
 707                                 (unsigned long long) dd->ipath_maskederrs,
 708                                 msg);
 709                 else {
 710                         /*
 711                          * rcvegrfull and rcvhdrqfull are "normal",
 712                          * for some types of processes (mostly benchmarks)
 713                          * that send huge numbers of messages, while not
 714                          * processing them.  So only complain about
 715                          * these at debug level.
 716                          */
 717                         if (s_iserr)
 718                                 ipath_dbg("Temporarily disabling reporting "
 719                                     "too frequent queue full errors (%s)\n",
 720                                     msg);
 721                         else
 722                                 ipath_cdbg(ERRPKT,
 723                                     "Temporarily disabling reporting too"
 724                                     " frequent packet errors (%s)\n",
 725                                     msg);
 726                 }
 727
 728                 /*
 729                  * Re-enable the masked errors after around 3 minutes.  in
 730                  * ipath_get_faststats().  If we have a series of fast
 731                  * repeating but different errors, the interval will keep
 732                  * stretching out, but that's OK, as that's pretty
 733                  * catastrophic.
 734                  */
 735                 dd->ipath_unmasktime = jiffies + HZ * 180;
 736         }
 737
 738         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
 739         if (ignore_this_time)
 740                 errs &= ~ignore_this_time;
 741         if (errs & ~dd->ipath_lasterror) {
 742                 errs &= ~dd->ipath_lasterror;
 743                 /* never suppress duplicate hwerrors or ibstatuschange */
 744                 dd->ipath_lasterror |= errs &
 745                         ~(INFINIPATH_E_HARDWARE |
 746                           INFINIPATH_E_IBSTATUSCHANGED);
 747         }
 748
 749         if (errs & INFINIPATH_E_SENDSPECIALTRIGGER) {
 750                 dd->ipath_spectriggerhit++;
 751                 ipath_dbg("%lu special trigger hits\n",
 752                         dd->ipath_spectriggerhit);
 753         }
 754
 755         /* likely due to cancel; so suppress message unless verbose */
 756         if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
 757                 dd->ipath_lastcancel > jiffies) {
 758                 /* armlaunch takes precedence; it often causes both. */
 759                 ipath_cdbg(VERBOSE,
 760                         "Suppressed %s error (%llx) after sendbuf cancel\n",
 761                         (errs &  INFINIPATH_E_SPIOARMLAUNCH) ?
 762                         "armlaunch" : "sendpktlen", (unsigned long long)errs);
 763                 errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
 764         }
 765
 766         if (!errs)
 767                 return 0;
 768
 769         if (!noprint) {
 770                 ipath_err_t mask;
 771                 /*
 772                  * The ones we mask off are handled specially below
 773                  * or above.  Also mask SDMADISABLED by default as it
 774                  * is too chatty.
 775                  */
 776                 mask = INFINIPATH_E_IBSTATUSCHANGED |
 777                         INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 778                         INFINIPATH_E_HARDWARE | INFINIPATH_E_SDMADISABLED;
 779
 780                 /* if we're in debug, then don't mask SDMADISABLED msgs */
 781                 if (ipath_debug & __IPATH_DBG)
 782                         mask &= ~INFINIPATH_E_SDMADISABLED;
 783
 784                 ipath_decode_err(dd, msg, sizeof msg, errs & ~mask);
 785         } else
 786                 /* so we don't need if (!noprint) at strlcat's below */
 787                 *msg = 0;
 788
 789         if (errs & E_SUM_PKTERRS) {
 790                 ipath_stats.sps_pkterrs++;
 791                 chkerrpkts = 1;
 792         }
 793         if (errs & E_SUM_ERRS)
 794                 ipath_stats.sps_errs++;
 795
 796         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
 797                 ipath_stats.sps_crcerrs++;
 798                 chkerrpkts = 1;
 799         }
 800         iserr = errs & ~(E_SUM_PKTERRS | INFINIPATH_E_PKTERRS);
 801
 802
 803         /*
 804          * We don't want to print these two as they happen, or we can make
 805          * the situation even worse, because it takes so long to print
 806          * messages to serial consoles.  Kernel ports get printed from
 807          * fast_stats, no more than every 5 seconds, user ports get printed
 808          * on close
 809          */
 810         if (errs & INFINIPATH_E_RRCVHDRFULL)
 811                 chkerrpkts |= handle_hdrq_full(dd);
 812         if (errs & INFINIPATH_E_RRCVEGRFULL) {
 813                 struct ipath_portdata *pd = dd->ipath_pd[0];
 814
 815                 /*
 816                  * since this is of less importance and not likely to
 817                  * happen without also getting hdrfull, only count
 818                  * occurrences; don't check each port (or even the kernel
 819                  * vs user)
 820                  */
 821                 ipath_stats.sps_etidfull++;
 822                 if (pd->port_head != ipath_get_hdrqtail(pd))
 823                         chkerrpkts |= 1;
 824         }
 825
 826         /*
 827          * do this before IBSTATUSCHANGED, in case both bits set in a single
 828          * interrupt; we want the STATUSCHANGE to "win", so we do our
 829          * internal copy of state machine correctly
 830          */
 831         if (errs & INFINIPATH_E_RIBLOSTLINK) {
 832                 /*
 833                  * force through block below
 834                  */
 835                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
 836                 ipath_stats.sps_iblink++;
 837                 dd->ipath_flags |= IPATH_LINKDOWN;
 838                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 839                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
 840                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 841
 842                 ipath_dbg("Lost link, link now down (%s)\n",
 843                         ipath_ibcstatus_str[ipath_read_kreg64(dd,
 844                         dd->ipath_kregs->kr_ibcstatus) & 0xf]);
 845         }
 846         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
 847                 handle_e_ibstatuschanged(dd, errs);
 848
 849         if (errs & INFINIPATH_E_RESET) {
 850                 if (!noprint)
 851                         ipath_dev_err(dd, "Got reset, requires re-init "
 852                                       "(unload and reload driver)\n");
 853                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
 854                 /* mark as having had error */
 855                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 856                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
 857         }
 858
 859         if (!noprint && *msg) {
 860                 if (iserr)
 861                         ipath_dev_err(dd, "%s error\n", msg);
 862         }
 863         if (dd->ipath_state_wanted & dd->ipath_flags) {
 864                 ipath_cdbg(VERBOSE, "driver wanted state %x, iflags now %x, "
 865                            "waking\n", dd->ipath_state_wanted,
 866                            dd->ipath_flags);
 867                 wake_up_interruptible(&ipath_state_wait);
 868         }
 869
 870         return chkerrpkts;
 871 }
 872
 873 /*
 874  * try to cleanup as much as possible for anything that might have gone
 875  * wrong while in freeze mode, such as pio buffers being written by user
 876  * processes (causing armlaunch), send errors due to going into freeze mode,
 877  * etc., and try to avoid causing extra interrupts while doing so.
 878  * Forcibly update the in-memory pioavail register copies after cleanup
 879  * because the chip won't do it while in freeze mode (the register values
 880  * themselves are kept correct).
 881  * Make sure that we don't lose any important interrupts by using the chip
 882  * feature that says that writing 0 to a bit in *clear that is set in
 883  * *status will cause an interrupt to be generated again (if allowed by
 884  * the *mask value).
 885  */
 886 void ipath_clear_freeze(struct ipath_devdata *dd)
 887 {
 888         /* disable error interrupts, to avoid confusion */
 889         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask, 0ULL);
 890
 891         /* also disable interrupts; errormask is sometimes overwriten */
 892         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 893
 894         ipath_cancel_sends(dd, 1);
 895
 896         /* clear the freeze, and be sure chip saw it */
 897         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 898                          dd->ipath_control);
 899         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 900
 901         /* force in-memory update now we are out of freeze */
 902         ipath_force_pio_avail_update(dd);
 903
 904         /*
 905          * force new interrupt if any hwerr, error or interrupt bits are
 906          * still set, and clear "safe" send packet errors related to freeze
 907          * and cancelling sends.  Re-enable error interrupts before possible
 908          * force of re-interrupt on pending interrupts.
 909          */
 910         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
 911         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 912                 E_SPKT_ERRS_IGNORE);
 913         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 914                 dd->ipath_errormask);
 915         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, -1LL);
 916         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 917 }
 918
 919
 920 /* this is separate to allow for better optimization of ipath_intr() */
 921
 922 static noinline void ipath_bad_intr(struct ipath_devdata *dd, u32 *unexpectp)
 923 {
 924         /*
 925          * sometimes happen during driver init and unload, don't want
 926          * to process any interrupts at that point
 927          */
 928
 929         /* this is just a bandaid, not a fix, if something goes badly
 930          * wrong */
 931         if (++*unexpectp > 100) {
 932                 if (++*unexpectp > 105) {
 933                         /*
 934                          * ok, we must be taking somebody else's interrupts,
 935                          * due to a messed up mptable and/or PIRQ table, so
 936                          * unregister the interrupt.  We've seen this during
 937                          * linuxbios development work, and it may happen in
 938                          * the future again.
 939                          */
 940                         if (dd->pcidev && dd->ipath_irq) {
 941                                 ipath_dev_err(dd, "Now %u unexpected "
 942                                               "interrupts, unregistering "
 943                                               "interrupt handler\n",
 944                                               *unexpectp);
 945                                 ipath_dbg("free_irq of irq %d\n",
 946                                           dd->ipath_irq);
 947                                 dd->ipath_f_free_irq(dd);
 948                         }
 949                 }
 950                 if (ipath_read_ireg(dd, dd->ipath_kregs->kr_intmask)) {
 951                         ipath_dev_err(dd, "%u unexpected interrupts, "
 952                                       "disabling interrupts completely\n",
 953                                       *unexpectp);
 954                         /*
 955                          * disable all interrupts, something is very wrong
 956                          */
 957                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 958                                          0ULL);
 959                 }
 960         } else if (*unexpectp > 1)
 961                 ipath_dbg("Interrupt when not ready, should not happen, "
 962                           "ignoring\n");
 963 }
 964
 965 static noinline void ipath_bad_regread(struct ipath_devdata *dd)
 966 {
 967         static int allbits;
 968
 969         /* separate routine, for better optimization of ipath_intr() */
 970
 971         /*
 972          * We print the message and disable interrupts, in hope of
 973          * having a better chance of debugging the problem.
 974          */
 975         ipath_dev_err(dd,
 976                       "Read of interrupt status failed (all bits set)\n");
 977         if (allbits++) {
 978                 /* disable all interrupts, something is very wrong */
 979                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 980                 if (allbits == 2) {
 981                         ipath_dev_err(dd, "Still bad interrupt status, "
 982                                       "unregistering interrupt\n");
 983                         dd->ipath_f_free_irq(dd);
 984                 } else if (allbits > 2) {
 985                         if ((allbits % 10000) == 0)
 986                                 printk(".");
 987                 } else
 988                         ipath_dev_err(dd, "Disabling interrupts, "
 989                                       "multiple errors\n");
 990         }
 991 }
 992
 993 static void handle_layer_pioavail(struct ipath_devdata *dd)
 994 {
 995         unsigned long flags;
 996         int ret;
 997
 998         ret = ipath_ib_piobufavail(dd->verbs_dev);
 999         if (ret > 0)
1000                 goto set;
1001
1002         return;
1003 set:
1004         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1005         dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL;
1006         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1007                          dd->ipath_sendctrl);
1008         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1009         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1010 }
1011
1012 /*
1013  * Handle receive interrupts for user ports; this means a user
1014  * process was waiting for a packet to arrive, and didn't want
1015  * to poll
1016  */
1017 static void handle_urcv(struct ipath_devdata *dd, u64 istat)
1018 {
1019         u64 portr;
1020         int i;
1021         int rcvdint = 0;
1022
1023         /*
1024          * test_and_clear_bit(IPATH_PORT_WAITING_RCV) and
1025          * test_and_clear_bit(IPATH_PORT_WAITING_URG) below
1026          * would both like timely updates of the bits so that
1027          * we don't pass them by unnecessarily.  the rmb()
1028          * here ensures that we see them promptly -- the
1029          * corresponding wmb()'s are in ipath_poll_urgent()
1030          * and ipath_poll_next()...
1031          */
1032         rmb();
1033         portr = ((istat >> dd->ipath_i_rcvavail_shift) &
1034                  dd->ipath_i_rcvavail_mask) |
1035                 ((istat >> dd->ipath_i_rcvurg_shift) &
1036                  dd->ipath_i_rcvurg_mask);
1037         for (i = 1; i < dd->ipath_cfgports; i++) {
1038                 struct ipath_portdata *pd = dd->ipath_pd[i];
1039
1040                 if (portr & (1 << i) && pd && pd->port_cnt) {
1041                         if (test_and_clear_bit(IPATH_PORT_WAITING_RCV,
1042                                                &pd->port_flag)) {
1043                                 clear_bit(i + dd->ipath_r_intravail_shift,
1044                                           &dd->ipath_rcvctrl);
1045                                 wake_up_interruptible(&pd->port_wait);
1046                                 rcvdint = 1;
1047                         } else if (test_and_clear_bit(IPATH_PORT_WAITING_URG,
1048                                                       &pd->port_flag)) {
1049                                 pd->port_urgent++;
1050                                 wake_up_interruptible(&pd->port_wait);
1051                         }
1052                 }
1053         }
1054         if (rcvdint) {
1055                 /* only want to take one interrupt, so turn off the rcv
1056                  * interrupt for all the ports that we set the rcv_waiting
1057                  * (but never for kernel port)
1058                  */
1059                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1060                                  dd->ipath_rcvctrl);
1061         }
1062 }
1063
1064 irqreturn_t ipath_intr(int irq, void *data)
1065 {
1066         struct ipath_devdata *dd = data;
1067         u64 istat, chk0rcv = 0;
1068         ipath_err_t estat = 0;
1069         irqreturn_t ret;
1070         static unsigned unexpected = 0;
1071         u64 kportrbits;
1072
1073         ipath_stats.sps_ints++;
1074
1075         if (dd->ipath_int_counter != (u32) -1)
1076                 dd->ipath_int_counter++;
1077
1078         if (!(dd->ipath_flags & IPATH_PRESENT)) {
1079                 /*
1080                  * This return value is not great, but we do not want the
1081                  * interrupt core code to remove our interrupt handler
1082                  * because we don't appear to be handling an interrupt
1083                  * during a chip reset.
1084                  */
1085                 return IRQ_HANDLED;
1086         }
1087
1088         /*
1089          * this needs to be flags&initted, not statusp, so we keep
1090          * taking interrupts even after link goes down, etc.
1091          * Also, we *must* clear the interrupt at some point, or we won't
1092          * take it again, which can be real bad for errors, etc...
1093          */
1094
1095         if (!(dd->ipath_flags & IPATH_INITTED)) {
1096                 ipath_bad_intr(dd, &unexpected);
1097                 ret = IRQ_NONE;
1098                 goto bail;
1099         }
1100
1101         istat = ipath_read_ireg(dd, dd->ipath_kregs->kr_intstatus);
1102
1103         if (unlikely(!istat)) {
1104                 ipath_stats.sps_nullintr++;
1105                 ret = IRQ_NONE; /* not our interrupt, or already handled */
1106                 goto bail;
1107         }
1108         if (unlikely(istat == -1)) {
1109                 ipath_bad_regread(dd);
1110                 /* don't know if it was our interrupt or not */
1111                 ret = IRQ_NONE;
1112                 goto bail;
1113         }
1114
1115         if (unexpected)
1116                 unexpected = 0;
1117
1118         if (unlikely(istat & ~dd->ipath_i_bitsextant))
1119                 ipath_dev_err(dd,
1120                               "interrupt with unknown interrupts %Lx set\n",
1121                               istat & ~dd->ipath_i_bitsextant);
1122         else if (istat & ~INFINIPATH_I_ERROR) /* errors do own printing */
1123                 ipath_cdbg(VERBOSE, "intr stat=0x%Lx\n", istat);
1124
1125         if (istat & INFINIPATH_I_ERROR) {
1126                 ipath_stats.sps_errints++;
1127                 estat = ipath_read_kreg64(dd,
1128                                           dd->ipath_kregs->kr_errorstatus);
1129                 if (!estat)
1130                         dev_info(&dd->pcidev->dev, "error interrupt (%Lx), "
1131                                  "but no error bits set!\n", istat);
1132                 else if (estat == -1LL)
1133                         /*
1134                          * should we try clearing all, or hope next read
1135                          * works?
1136                          */
1137                         ipath_dev_err(dd, "Read of error status failed "
1138                                       "(all bits set); ignoring\n");
1139                 else
1140                         chk0rcv |= handle_errors(dd, estat);
1141         }
1142
1143         if (istat & INFINIPATH_I_GPIO) {
1144                 /*
1145                  * GPIO interrupts fall in two broad classes:
1146                  * GPIO_2 indicates (on some HT4xx boards) that a packet
1147                  *        has arrived for Port 0. Checking for this
1148                  *        is controlled by flag IPATH_GPIO_INTR.
1149                  * GPIO_3..5 on IBA6120 Rev2 and IBA6110 Rev4 chips indicate
1150                  *        errors that we need to count. Checking for this
1151                  *        is controlled by flag IPATH_GPIO_ERRINTRS.
1152                  */
1153                 u32 gpiostatus;
1154                 u32 to_clear = 0;
1155
1156                 gpiostatus = ipath_read_kreg32(
1157                         dd, dd->ipath_kregs->kr_gpio_status);
1158                 /* First the error-counter case. */
1159                 if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) &&
1160                     (dd->ipath_flags & IPATH_GPIO_ERRINTRS)) {
1161                         /* want to clear the bits we see asserted. */
1162                         to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK);
1163
1164                         /*
1165                          * Count appropriately, clear bits out of our copy,
1166                          * as they have been "handled".
1167                          */
1168                         if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) {
1169                                 ipath_dbg("FlowCtl on UnsupVL\n");
1170                                 dd->ipath_rxfc_unsupvl_errs++;
1171                         }
1172                         if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) {
1173                                 ipath_dbg("Overrun Threshold exceeded\n");
1174                                 dd->ipath_overrun_thresh_errs++;
1175                         }
1176                         if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) {
1177                                 ipath_dbg("Local Link Integrity error\n");
1178                                 dd->ipath_lli_errs++;
1179                         }
1180                         gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK;
1181                 }
1182                 /* Now the Port0 Receive case */
1183                 if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) &&
1184                     (dd->ipath_flags & IPATH_GPIO_INTR)) {
1185                         /*
1186                          * GPIO status bit 2 is set, and we expected it.
1187                          * clear it and indicate in p0bits.
1188                          * This probably only happens if a Port0 pkt
1189                          * arrives at _just_ the wrong time, and we
1190                          * handle that by seting chk0rcv;
1191                          */
1192                         to_clear |= (1 << IPATH_GPIO_PORT0_BIT);
1193                         gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT);
1194                         chk0rcv = 1;
1195                 }
1196                 if (gpiostatus) {
1197                         /*
1198                          * Some unexpected bits remain. If they could have
1199                          * caused the interrupt, complain and clear.
1200                          * To avoid repetition of this condition, also clear
1201                          * the mask. It is almost certainly due to error.
1202                          */
1203                         const u32 mask = (u32) dd->ipath_gpio_mask;
1204
1205                         if (mask & gpiostatus) {
1206                                 ipath_dbg("Unexpected GPIO IRQ bits %x\n",
1207                                   gpiostatus & mask);
1208                                 to_clear |= (gpiostatus & mask);
1209                                 dd->ipath_gpio_mask &= ~(gpiostatus & mask);
1210                                 ipath_write_kreg(dd,
1211                                         dd->ipath_kregs->kr_gpio_mask,
1212                                         dd->ipath_gpio_mask);
1213                         }
1214                 }
1215                 if (to_clear) {
1216                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
1217                                         (u64) to_clear);
1218                 }
1219         }
1220
1221         /*
1222          * Clear the interrupt bits we found set, unless they are receive
1223          * related, in which case we already cleared them above, and don't
1224          * want to clear them again, because we might lose an interrupt.
1225          * Clear it early, so we "know" know the chip will have seen this by
1226          * the time we process the queue, and will re-interrupt if necessary.
1227          * The processor itself won't take the interrupt again until we return.
1228          */
1229         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
1230
1231         /*
1232          * Handle kernel receive queues before checking for pio buffers
1233          * available since receives can overflow; piobuf waiters can afford
1234          * a few extra cycles, since they were waiting anyway, and user's
1235          * waiting for receive are at the bottom.
1236          */
1237         kportrbits = (1ULL << dd->ipath_i_rcvavail_shift) |
1238                 (1ULL << dd->ipath_i_rcvurg_shift);
1239         if (chk0rcv || (istat & kportrbits)) {
1240                 istat &= ~kportrbits;
1241                 ipath_kreceive(dd->ipath_pd[0]);
1242         }
1243
1244         if (istat & ((dd->ipath_i_rcvavail_mask << dd->ipath_i_rcvavail_shift) |
1245                      (dd->ipath_i_rcvurg_mask << dd->ipath_i_rcvurg_shift)))
1246                 handle_urcv(dd, istat);
1247
1248         if (istat & (INFINIPATH_I_SDMAINT | INFINIPATH_I_SDMADISABLED))
1249                 handle_sdma_intr(dd, istat);
1250
1251         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
1252                 unsigned long flags;
1253
1254                 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1255                 dd->ipath_sendctrl &= ~INFINIPATH_S_PIOINTBUFAVAIL;
1256                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1257                                  dd->ipath_sendctrl);
1258                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1259                 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1260
1261                 /* always process; sdma verbs uses PIO for acks and VL15  */
1262                 handle_layer_pioavail(dd);
1263         }
1264
1265         ret = IRQ_HANDLED;
1266
1267 bail:
1268         return ret;
1269 }