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 #include <linux/sched.h>
  37
  38 #include "ipath_kernel.h"
  39 #include "ipath_verbs.h"
  40 #include "ipath_common.h"
  41
  42
  43 /*
  44  * Called when we might have an error that is specific to a particular
  45  * PIO buffer, and may need to cancel that buffer, so it can be re-used.
  46  */
  47 void ipath_disarm_senderrbufs(struct ipath_devdata *dd)
  48 {
  49         u32 piobcnt;
  50         unsigned long sbuf[4];
  51         /*
  52          * it's possible that sendbuffererror could have bits set; might
  53          * have already done this as a result of hardware error handling
  54          */
  55         piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
  56         /* read these before writing errorclear */
  57         sbuf[0] = ipath_read_kreg64(
  58                 dd, dd->ipath_kregs->kr_sendbuffererror);
  59         sbuf[1] = ipath_read_kreg64(
  60                 dd, dd->ipath_kregs->kr_sendbuffererror + 1);
  61         if (piobcnt > 128)
  62                 sbuf[2] = ipath_read_kreg64(
  63                         dd, dd->ipath_kregs->kr_sendbuffererror + 2);
  64         if (piobcnt > 192)
  65                 sbuf[3] = ipath_read_kreg64(
  66                         dd, dd->ipath_kregs->kr_sendbuffererror + 3);
  67         else
  68                 sbuf[3] = 0;
  69
  70         if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
  71                 int i;
  72                 if (ipath_debug & (__IPATH_PKTDBG|__IPATH_DBG) &&
  73                         dd->ipath_lastcancel > jiffies) {
  74                         __IPATH_DBG_WHICH(__IPATH_PKTDBG|__IPATH_DBG,
  75                                           "SendbufErrs %lx %lx", sbuf[0],
  76                                           sbuf[1]);
  77                         if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
  78                                 printk(" %lx %lx ", sbuf[2], sbuf[3]);
  79                         printk("\n");
  80                 }
  81
  82                 for (i = 0; i < piobcnt; i++)
  83                         if (test_bit(i, sbuf))
  84                                 ipath_disarm_piobufs(dd, i, 1);
  85                 /* ignore armlaunch errs for a bit */
  86                 dd->ipath_lastcancel = jiffies+3;
  87         }
  88 }
  89
  90
  91 /* These are all rcv-related errors which we want to count for stats */
  92 #define E_SUM_PKTERRS \
  93         (INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
  94          INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
  95          INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
  96          INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
  97          INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
  98          INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
  99
 100 /* These are all send-related errors which we want to count for stats */
 101 #define E_SUM_ERRS \
 102         (INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
 103          INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 104          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
 105          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 106          INFINIPATH_E_INVALIDADDR)
 107
 108 /*
 109  * this is similar to E_SUM_ERRS, but can't ignore armlaunch, don't ignore
 110  * errors not related to freeze and cancelling buffers.  Can't ignore
 111  * armlaunch because could get more while still cleaning up, and need
 112  * to cancel those as they happen.
 113  */
 114 #define E_SPKT_ERRS_IGNORE \
 115          (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 116          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SMINPKTLEN | \
 117          INFINIPATH_E_SPKTLEN)
 118
 119 /*
 120  * these are errors that can occur when the link changes state while
 121  * a packet is being sent or received.  This doesn't cover things
 122  * like EBP or VCRC that can be the result of a sending having the
 123  * link change state, so we receive a "known bad" packet.
 124  */
 125 #define E_SUM_LINK_PKTERRS \
 126         (INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
 127          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
 128          INFINIPATH_E_RSHORTPKTLEN | INFINIPATH_E_RMINPKTLEN | \
 129          INFINIPATH_E_RUNEXPCHAR)
 130
 131 static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
 132 {
 133         u64 ignore_this_time = 0;
 134
 135         ipath_disarm_senderrbufs(dd);
 136         if ((errs & E_SUM_LINK_PKTERRS) &&
 137             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 138                 /*
 139                  * This can happen when SMA is trying to bring the link
 140                  * up, but the IB link changes state at the "wrong" time.
 141                  * The IB logic then complains that the packet isn't
 142                  * valid.  We don't want to confuse people, so we just
 143                  * don't print them, except at debug
 144                  */
 145                 ipath_dbg("Ignoring packet errors %llx, because link not "
 146                           "ACTIVE\n", (unsigned long long) errs);
 147                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 148         }
 149
 150         return ignore_this_time;
 151 }
 152
 153 /* generic hw error messages... */
 154 #define INFINIPATH_HWE_TXEMEMPARITYERR_MSG(a) \
 155         { \
 156                 .mask = ( INFINIPATH_HWE_TXEMEMPARITYERR_##a <<    \
 157                           INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT ),   \
 158                 .msg = "TXE " #a " Memory Parity"            \
 159         }
 160 #define INFINIPATH_HWE_RXEMEMPARITYERR_MSG(a) \
 161         { \
 162                 .mask = ( INFINIPATH_HWE_RXEMEMPARITYERR_##a <<    \
 163                           INFINIPATH_HWE_RXEMEMPARITYERR_SHIFT ),   \
 164                 .msg = "RXE " #a " Memory Parity"            \
 165         }
 166
 167 static const struct ipath_hwerror_msgs ipath_generic_hwerror_msgs[] = {
 168         INFINIPATH_HWE_MSG(IBCBUSFRSPCPARITYERR, "IPATH2IB Parity"),
 169         INFINIPATH_HWE_MSG(IBCBUSTOSPCPARITYERR, "IB2IPATH Parity"),
 170
 171         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOBUF),
 172         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOPBC),
 173         INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOLAUNCHFIFO),
 174
 175         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(RCVBUF),
 176         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(LOOKUPQ),
 177         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EAGERTID),
 178         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EXPTID),
 179         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(FLAGBUF),
 180         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(DATAINFO),
 181         INFINIPATH_HWE_RXEMEMPARITYERR_MSG(HDRINFO),
 182 };
 183
 184 /**
 185  * ipath_format_hwmsg - format a single hwerror message
 186  * @msg message buffer
 187  * @msgl length of message buffer
 188  * @hwmsg message to add to message buffer
 189  */
 190 static void ipath_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
 191 {
 192         strlcat(msg, "[", msgl);
 193         strlcat(msg, hwmsg, msgl);
 194         strlcat(msg, "]", msgl);
 195 }
 196
 197 /**
 198  * ipath_format_hwerrors - format hardware error messages for display
 199  * @hwerrs hardware errors bit vector
 200  * @hwerrmsgs hardware error descriptions
 201  * @nhwerrmsgs number of hwerrmsgs
 202  * @msg message buffer
 203  * @msgl message buffer length
 204  */
 205 void ipath_format_hwerrors(u64 hwerrs,
 206                            const struct ipath_hwerror_msgs *hwerrmsgs,
 207                            size_t nhwerrmsgs,
 208                            char *msg, size_t msgl)
 209 {
 210         int i;
 211         const int glen =
 212             sizeof(ipath_generic_hwerror_msgs) /
 213             sizeof(ipath_generic_hwerror_msgs[0]);
 214
 215         for (i=0; i<glen; i++) {
 216                 if (hwerrs & ipath_generic_hwerror_msgs[i].mask) {
 217                         ipath_format_hwmsg(msg, msgl,
 218                                            ipath_generic_hwerror_msgs[i].msg);
 219                 }
 220         }
 221
 222         for (i=0; i<nhwerrmsgs; i++) {
 223                 if (hwerrs & hwerrmsgs[i].mask) {
 224                         ipath_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
 225                 }
 226         }
 227 }
 228
 229 /* return the strings for the most common link states */
 230 static char *ib_linkstate(struct ipath_devdata *dd, u64 ibcs)
 231 {
 232         char *ret;
 233         u32 state;
 234
 235         state = ipath_ib_state(dd, ibcs);
 236         if (state == dd->ib_init)
 237                 ret = "Init";
 238         else if (state == dd->ib_arm)
 239                 ret = "Arm";
 240         else if (state == dd->ib_active)
 241                 ret = "Active";
 242         else
 243                 ret = "Down";
 244         return ret;
 245 }
 246
 247 void signal_ib_event(struct ipath_devdata *dd, enum ib_event_type ev)
 248 {
 249         struct ib_event event;
 250
 251         event.device = &dd->verbs_dev->ibdev;
 252         event.element.port_num = 1;
 253         event.event = ev;
 254         ib_dispatch_event(&event);
 255 }
 256
 257 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 258                                      ipath_err_t errs)
 259 {
 260         u32 ltstate, lstate, ibstate, lastlstate;
 261         u32 init = dd->ib_init;
 262         u32 arm = dd->ib_arm;
 263         u32 active = dd->ib_active;
 264         const u64 ibcs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
 265
 266         lstate = ipath_ib_linkstate(dd, ibcs); /* linkstate */
 267         ibstate = ipath_ib_state(dd, ibcs);
 268         /* linkstate at last interrupt */
 269         lastlstate = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
 270         ltstate = ipath_ib_linktrstate(dd, ibcs); /* linktrainingtate */
 271
 272         /*
 273          * Since going into a recovery state causes the link state to go
 274          * down and since recovery is transitory, it is better if we "miss"
 275          * ever seeing the link training state go into recovery (i.e.,
 276          * ignore this transition for link state special handling purposes)
 277          * without even updating ipath_lastibcstat.
 278          */
 279         if ((ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN) ||
 280             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT) ||
 281             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERIDLE))
 282                 goto done;
 283
 284         /*
 285          * if linkstate transitions into INIT from any of the various down
 286          * states, or if it transitions from any of the up (INIT or better)
 287          * states into any of the down states (except link recovery), then
 288          * call the chip-specific code to take appropriate actions.
 289          */
 290         if (lstate >= INFINIPATH_IBCS_L_STATE_INIT &&
 291                 lastlstate == INFINIPATH_IBCS_L_STATE_DOWN) {
 292                 /* transitioned to UP */
 293                 if (dd->ipath_f_ib_updown(dd, 1, ibcs)) {
 294                         /* link came up, so we must no longer be disabled */
 295                         dd->ipath_flags &= ~IPATH_IB_LINK_DISABLED;
 296                         ipath_cdbg(LINKVERB, "LinkUp handled, skipped\n");
 297                         goto skip_ibchange; /* chip-code handled */
 298                 }
 299         } else if ((lastlstate >= INFINIPATH_IBCS_L_STATE_INIT ||
 300                 (dd->ipath_flags & IPATH_IB_FORCE_NOTIFY)) &&
 301                 ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT &&
 302                 ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
 303                 int handled;
 304                 handled = dd->ipath_f_ib_updown(dd, 0, ibcs);
 305                 dd->ipath_flags &= ~IPATH_IB_FORCE_NOTIFY;
 306                 if (handled) {
 307                         ipath_cdbg(LINKVERB, "LinkDown handled, skipped\n");
 308                         goto skip_ibchange; /* chip-code handled */
 309                 }
 310         }
 311
 312         /*
 313          * Significant enough to always print and get into logs, if it was
 314          * unexpected.  If it was a requested state change, we'll have
 315          * already cleared the flags, so we won't print this warning
 316          */
 317         if ((ibstate != arm && ibstate != active) &&
 318             (dd->ipath_flags & (IPATH_LINKARMED | IPATH_LINKACTIVE))) {
 319                 dev_info(&dd->pcidev->dev, "Link state changed from %s "
 320                          "to %s\n", (dd->ipath_flags & IPATH_LINKARMED) ?
 321                          "ARM" : "ACTIVE", ib_linkstate(dd, ibcs));
 322         }
 323
 324         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 325             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 326                 u32 lastlts;
 327                 lastlts = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
 328                 /*
 329                  * Ignore cycling back and forth from Polling.Active to
 330                  * Polling.Quiet while waiting for the other end of the link
 331                  * to come up, except to try and decide if we are connected
 332                  * to a live IB device or not.  We will cycle back and
 333                  * forth between them if no cable is plugged in, the other
 334                  * device is powered off or disabled, etc.
 335                  */
 336                 if (lastlts == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 337                     lastlts == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 338                         if (!(dd->ipath_flags & IPATH_IB_AUTONEG_INPROG) &&
 339                              (++dd->ipath_ibpollcnt == 40)) {
 340                                 dd->ipath_flags |= IPATH_NOCABLE;
 341                                 *dd->ipath_statusp |=
 342                                         IPATH_STATUS_IB_NOCABLE;
 343                                 ipath_cdbg(LINKVERB, "Set NOCABLE\n");
 344                         }
 345                         ipath_cdbg(LINKVERB, "POLL change to %s (%x)\n",
 346                                 ipath_ibcstatus_str[ltstate], ibstate);
 347                         goto skip_ibchange;
 348                 }
 349         }
 350
 351         dd->ipath_ibpollcnt = 0; /* not poll*, now */
 352         ipath_stats.sps_iblink++;
 353
 354         if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
 355                 u64 linkrecov;
 356                 linkrecov = ipath_snap_cntr(dd,
 357                         dd->ipath_cregs->cr_iblinkerrrecovcnt);
 358                 if (linkrecov != dd->ipath_lastlinkrecov) {
 359                         ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
 360                                 (unsigned long long) ibcs,
 361                                 ib_linkstate(dd, ibcs),
 362                                 ipath_ibcstatus_str[ltstate],
 363                                 (unsigned long long) linkrecov);
 364                         /* and no more until active again */
 365                         dd->ipath_lastlinkrecov = 0;
 366                         ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
 367                         goto skip_ibchange;
 368                 }
 369         }
 370
 371         if (ibstate == init || ibstate == arm || ibstate == active) {
 372                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
 373                 if (ibstate == init || ibstate == arm) {
 374                         *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 375                         if (dd->ipath_flags & IPATH_LINKACTIVE)
 376                                 signal_ib_event(dd, IB_EVENT_PORT_ERR);
 377                 }
 378                 if (ibstate == arm) {
 379                         dd->ipath_flags |= IPATH_LINKARMED;
 380                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 381                                 IPATH_LINKINIT | IPATH_LINKDOWN |
 382                                 IPATH_LINKACTIVE | IPATH_NOCABLE);
 383                         ipath_hol_down(dd);
 384                 } else  if (ibstate == init) {
 385                         /*
 386                          * set INIT and DOWN.  Down is checked by
 387                          * most of the other code, but INIT is
 388                          * useful to know in a few places.
 389                          */
 390                         dd->ipath_flags |= IPATH_LINKINIT |
 391                                 IPATH_LINKDOWN;
 392                         dd->ipath_flags &= ~(IPATH_LINKUNK |
 393                                 IPATH_LINKARMED | IPATH_LINKACTIVE |
 394                                 IPATH_NOCABLE);
 395                         ipath_hol_down(dd);
 396                 } else {  /* active */
 397                         dd->ipath_lastlinkrecov = ipath_snap_cntr(dd,
 398                                 dd->ipath_cregs->cr_iblinkerrrecovcnt);
 399                         *dd->ipath_statusp |=
 400                                 IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
 401                         dd->ipath_flags |= IPATH_LINKACTIVE;
 402                         dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 403                                 | IPATH_LINKDOWN | IPATH_LINKARMED |
 404                                 IPATH_NOCABLE);
 405                         if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
 406                                 ipath_restart_sdma(dd);
 407                         signal_ib_event(dd, IB_EVENT_PORT_ACTIVE);
 408                         /* LED active not handled in chip _f_updown */
 409                         dd->ipath_f_setextled(dd, lstate, ltstate);
 410                         ipath_hol_up(dd);
 411                 }
 412
 413                 /*
 414                  * print after we've already done the work, so as not to
 415                  * delay the state changes and notifications, for debugging
 416                  */
 417                 if (lstate == lastlstate)
 418                         ipath_cdbg(LINKVERB, "Unchanged from last: %s "
 419                                 "(%x)\n", ib_linkstate(dd, ibcs), ibstate);
 420                 else
 421                         ipath_cdbg(VERBOSE, "Unit %u: link up to %s %s (%x)\n",
 422                                   dd->ipath_unit, ib_linkstate(dd, ibcs),
 423                                   ipath_ibcstatus_str[ltstate],  ibstate);
 424         } else { /* down */
 425                 if (dd->ipath_flags & IPATH_LINKACTIVE)
 426                         signal_ib_event(dd, IB_EVENT_PORT_ERR);
 427                 dd->ipath_flags |= IPATH_LINKDOWN;
 428                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 429                                      | IPATH_LINKACTIVE |
 430                                      IPATH_LINKARMED);
 431                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 432                 dd->ipath_lli_counter = 0;
 433
 434                 if (lastlstate != INFINIPATH_IBCS_L_STATE_DOWN)
 435                         ipath_cdbg(VERBOSE, "Unit %u link state down "
 436                                    "(state 0x%x), from %s\n",
 437                                    dd->ipath_unit, lstate,
 438                                    ib_linkstate(dd, dd->ipath_lastibcstat));
 439                 else
 440                         ipath_cdbg(LINKVERB, "Unit %u link state changed "
 441                                    "to %s (0x%x) from down (%x)\n",
 442                                    dd->ipath_unit,
 443                                    ipath_ibcstatus_str[ltstate],
 444                                    ibstate, lastlstate);
 445         }
 446
 447 skip_ibchange:
 448         dd->ipath_lastibcstat = ibcs;
 449 done:
 450         return;
 451 }
 452
 453 static void handle_supp_msgs(struct ipath_devdata *dd,
 454                              unsigned supp_msgs, char *msg, u32 msgsz)
 455 {
 456         /*
 457          * Print the message unless it's ibc status change only, which
 458          * happens so often we never want to count it.
 459          */
 460         if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
 461                 int iserr;
 462                 ipath_err_t mask;
 463                 iserr = ipath_decode_err(dd, msg, msgsz,
 464                                          dd->ipath_lasterror &
 465                                          ~INFINIPATH_E_IBSTATUSCHANGED);
 466
 467                 mask = INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 468                         INFINIPATH_E_PKTERRS | INFINIPATH_E_SDMADISABLED;
 469
 470                 /* if we're in debug, then don't mask SDMADISABLED msgs */
 471                 if (ipath_debug & __IPATH_DBG)
 472                         mask &= ~INFINIPATH_E_SDMADISABLED;
 473
 474                 if (dd->ipath_lasterror & ~mask)
 475                         ipath_dev_err(dd, "Suppressed %u messages for "
 476                                       "fast-repeating errors (%s) (%llx)\n",
 477                                       supp_msgs, msg,
 478                                       (unsigned long long)
 479                                       dd->ipath_lasterror);
 480                 else {
 481                         /*
 482                          * rcvegrfull and rcvhdrqfull are "normal", for some
 483                          * types of processes (mostly benchmarks) that send
 484                          * huge numbers of messages, while not processing
 485                          * them. So only complain about these at debug
 486                          * level.
 487                          */
 488                         if (iserr)
 489                                 ipath_dbg("Suppressed %u messages for %s\n",
 490                                           supp_msgs, msg);
 491                         else
 492                                 ipath_cdbg(ERRPKT,
 493                                         "Suppressed %u messages for %s\n",
 494                                           supp_msgs, msg);
 495                 }
 496         }
 497 }
 498
 499 static unsigned handle_frequent_errors(struct ipath_devdata *dd,
 500                                        ipath_err_t errs, char *msg,
 501                                        u32 msgsz, int *noprint)
 502 {
 503         unsigned long nc;
 504         static unsigned long nextmsg_time;
 505         static unsigned nmsgs, supp_msgs;
 506
 507         /*
 508          * Throttle back "fast" messages to no more than 10 per 5 seconds.
 509          * This isn't perfect, but it's a reasonable heuristic. If we get
 510          * more than 10, give a 6x longer delay.
 511          */
 512         nc = jiffies;
 513         if (nmsgs > 10) {
 514                 if (time_before(nc, nextmsg_time)) {
 515                         *noprint = 1;
 516                         if (!supp_msgs++)
 517                                 nextmsg_time = nc + HZ * 3;
 518                 }
 519                 else if (supp_msgs) {
 520                         handle_supp_msgs(dd, supp_msgs, msg, msgsz);
 521                         supp_msgs = 0;
 522                         nmsgs = 0;
 523                 }
 524         }
 525         else if (!nmsgs++ || time_after(nc, nextmsg_time))
 526                 nextmsg_time = nc + HZ / 2;
 527
 528         return supp_msgs;
 529 }
 530
 531 static void handle_sdma_errors(struct ipath_devdata *dd, ipath_err_t errs)
 532 {
 533         unsigned long flags;
 534         int expected;
 535
 536         if (ipath_debug & __IPATH_DBG) {
 537                 char msg[128];
 538                 ipath_decode_err(dd, msg, sizeof msg, errs &
 539                         INFINIPATH_E_SDMAERRS);
 540                 ipath_dbg("errors %lx (%s)\n", (unsigned long)errs, msg);
 541         }
 542         if (ipath_debug & __IPATH_VERBDBG) {
 543                 unsigned long tl, hd, status, lengen;
 544                 tl = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmatail);
 545                 hd = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmahead);
 546                 status = ipath_read_kreg64(dd
 547                         , dd->ipath_kregs->kr_senddmastatus);
 548                 lengen = ipath_read_kreg64(dd,
 549                         dd->ipath_kregs->kr_senddmalengen);
 550                 ipath_cdbg(VERBOSE, "sdma tl 0x%lx hd 0x%lx status 0x%lx "
 551                         "lengen 0x%lx\n", tl, hd, status, lengen);
 552         }
 553
 554         spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 555         __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 556         expected = test_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
 557         spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 558         if (!expected)
 559                 ipath_cancel_sends(dd, 1);
 560 }
 561
 562 static void handle_sdma_intr(struct ipath_devdata *dd, u64 istat)
 563 {
 564         unsigned long flags;
 565         int expected;
 566
 567         if ((istat & INFINIPATH_I_SDMAINT) &&
 568             !test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 569                 ipath_sdma_intr(dd);
 570
 571         if (istat & INFINIPATH_I_SDMADISABLED) {
 572                 expected = test_bit(IPATH_SDMA_ABORTING,
 573                         &dd->ipath_sdma_status);
 574                 ipath_dbg("%s SDmaDisabled intr\n",
 575                         expected ? "expected" : "unexpected");
 576                 spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 577                 __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 578                 spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 579                 if (!expected)
 580                         ipath_cancel_sends(dd, 1);
 581                 if (!test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 582                         tasklet_hi_schedule(&dd->ipath_sdma_abort_task);
 583         }
 584 }
 585
 586 static int handle_hdrq_full(struct ipath_devdata *dd)
 587 {
 588         int chkerrpkts = 0;
 589         u32 hd, tl;
 590         u32 i;
 591
 592         ipath_stats.sps_hdrqfull++;
 593         for (i = 0; i < dd->ipath_cfgports; i++) {
 594                 struct ipath_portdata *pd = dd->ipath_pd[i];
 595
 596                 if (i == 0) {
 597                         /*
 598                          * For kernel receive queues, we just want to know
 599                          * if there are packets in the queue that we can
 600                          * process.
 601                          */
 602                         if (pd->port_head != ipath_get_hdrqtail(pd))
 603                                 chkerrpkts |= 1 << i;
 604                         continue;
 605                 }
 606
 607                 /* Skip if user context is not open */
 608                 if (!pd || !pd->port_cnt)
 609                         continue;
 610
 611                 /* Don't report the same point multiple times. */
 612                 if (dd->ipath_flags & IPATH_NODMA_RTAIL)
 613                         tl = ipath_read_ureg32(dd, ur_rcvhdrtail, i);
 614                 else
 615                         tl = ipath_get_rcvhdrtail(pd);
 616                 if (tl == pd->port_lastrcvhdrqtail)
 617                         continue;
 618
 619                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead, i);
 620                 if (hd == (tl + 1) || (!hd && tl == dd->ipath_hdrqlast)) {
 621                         pd->port_lastrcvhdrqtail = tl;
 622                         pd->port_hdrqfull++;
 623                         /* flush hdrqfull so that poll() sees it */
 624                         wmb();
 625                         wake_up_interruptible(&pd->port_wait);
 626                 }
 627         }
 628
 629         return chkerrpkts;
 630 }
 631
 632 static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
 633 {
 634         char msg[128];
 635         u64 ignore_this_time = 0;
 636         u64 iserr = 0;
 637         int chkerrpkts = 0, noprint = 0;
 638         unsigned supp_msgs;
 639         int log_idx;
 640
 641         /*
 642          * don't report errors that are masked, either at init
 643          * (not set in ipath_errormask), or temporarily (set in
 644          * ipath_maskederrs)
 645          */
 646         errs &= dd->ipath_errormask & ~dd->ipath_maskederrs;
 647
 648         supp_msgs = handle_frequent_errors(dd, errs, msg, (u32)sizeof msg,
 649                 &noprint);
 650
 651         /* do these first, they are most important */
 652         if (errs & INFINIPATH_E_HARDWARE) {
 653                 /* reuse same msg buf */
 654                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
 655         } else {
 656                 u64 mask;
 657                 for (log_idx = 0; log_idx < IPATH_EEP_LOG_CNT; ++log_idx) {
 658                         mask = dd->ipath_eep_st_masks[log_idx].errs_to_log;
 659                         if (errs & mask)
 660                                 ipath_inc_eeprom_err(dd, log_idx, 1);
 661                 }
 662         }
 663
 664         if (errs & INFINIPATH_E_SDMAERRS)
 665                 handle_sdma_errors(dd, errs);
 666
 667         if (!noprint && (errs & ~dd->ipath_e_bitsextant))
 668                 ipath_dev_err(dd, "error interrupt with unknown errors "
 669                               "%llx set\n", (unsigned long long)
 670                               (errs & ~dd->ipath_e_bitsextant));
 671
 672         if (errs & E_SUM_ERRS)
 673                 ignore_this_time = handle_e_sum_errs(dd, errs);
 674         else if ((errs & E_SUM_LINK_PKTERRS) &&
 675             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 676                 /*
 677                  * This can happen when SMA is trying to bring the link
 678                  * up, but the IB link changes state at the "wrong" time.
 679                  * The IB logic then complains that the packet isn't
 680                  * valid.  We don't want to confuse people, so we just
 681                  * don't print them, except at debug
 682                  */
 683                 ipath_dbg("Ignoring packet errors %llx, because link not "
 684                           "ACTIVE\n", (unsigned long long) errs);
 685                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 686         }
 687
 688         if (supp_msgs == 250000) {
 689                 int s_iserr;
 690                 /*
 691                  * It's not entirely reasonable assuming that the errors set
 692                  * in the last clear period are all responsible for the
 693                  * problem, but the alternative is to assume it's the only
 694                  * ones on this particular interrupt, which also isn't great
 695                  */
 696                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
 697
 698                 dd->ipath_errormask &= ~dd->ipath_maskederrs;
 699                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 700                                  dd->ipath_errormask);
 701                 s_iserr = ipath_decode_err(dd, msg, sizeof msg,
 702                                            dd->ipath_maskederrs);
 703
 704                 if (dd->ipath_maskederrs &
 705                     ~(INFINIPATH_E_RRCVEGRFULL |
 706                       INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
 707                         ipath_dev_err(dd, "Temporarily disabling "
 708                             "error(s) %llx reporting; too frequent (%s)\n",
 709                                 (unsigned long long) dd->ipath_maskederrs,
 710                                 msg);
 711                 else {
 712                         /*
 713                          * rcvegrfull and rcvhdrqfull are "normal",
 714                          * for some types of processes (mostly benchmarks)
 715                          * that send huge numbers of messages, while not
 716                          * processing them.  So only complain about
 717                          * these at debug level.
 718                          */
 719                         if (s_iserr)
 720                                 ipath_dbg("Temporarily disabling reporting "
 721                                     "too frequent queue full errors (%s)\n",
 722                                     msg);
 723                         else
 724                                 ipath_cdbg(ERRPKT,
 725                                     "Temporarily disabling reporting too"
 726                                     " frequent packet errors (%s)\n",
 727                                     msg);
 728                 }
 729
 730                 /*
 731                  * Re-enable the masked errors after around 3 minutes.  in
 732                  * ipath_get_faststats().  If we have a series of fast
 733                  * repeating but different errors, the interval will keep
 734                  * stretching out, but that's OK, as that's pretty
 735                  * catastrophic.
 736                  */
 737                 dd->ipath_unmasktime = jiffies + HZ * 180;
 738         }
 739
 740         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
 741         if (ignore_this_time)
 742                 errs &= ~ignore_this_time;
 743         if (errs & ~dd->ipath_lasterror) {
 744                 errs &= ~dd->ipath_lasterror;
 745                 /* never suppress duplicate hwerrors or ibstatuschange */
 746                 dd->ipath_lasterror |= errs &
 747                         ~(INFINIPATH_E_HARDWARE |
 748                           INFINIPATH_E_IBSTATUSCHANGED);
 749         }
 750
 751         if (errs & INFINIPATH_E_SENDSPECIALTRIGGER) {
 752                 dd->ipath_spectriggerhit++;
 753                 ipath_dbg("%lu special trigger hits\n",
 754                         dd->ipath_spectriggerhit);
 755         }
 756
 757         /* likely due to cancel; so suppress message unless verbose */
 758         if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
 759                 dd->ipath_lastcancel > jiffies) {
 760                 /* armlaunch takes precedence; it often causes both. */
 761                 ipath_cdbg(VERBOSE,
 762                         "Suppressed %s error (%llx) after sendbuf cancel\n",
 763                         (errs &  INFINIPATH_E_SPIOARMLAUNCH) ?
 764                         "armlaunch" : "sendpktlen", (unsigned long long)errs);
 765                 errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
 766         }
 767
 768         if (!errs)
 769                 return 0;
 770
 771         if (!noprint) {
 772                 ipath_err_t mask;
 773                 /*
 774                  * The ones we mask off are handled specially below
 775                  * or above.  Also mask SDMADISABLED by default as it
 776                  * is too chatty.
 777                  */
 778                 mask = INFINIPATH_E_IBSTATUSCHANGED |
 779                         INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 780                         INFINIPATH_E_HARDWARE | INFINIPATH_E_SDMADISABLED;
 781
 782                 /* if we're in debug, then don't mask SDMADISABLED msgs */
 783                 if (ipath_debug & __IPATH_DBG)
 784                         mask &= ~INFINIPATH_E_SDMADISABLED;
 785
 786                 ipath_decode_err(dd, msg, sizeof msg, errs & ~mask);
 787         } else
 788                 /* so we don't need if (!noprint) at strlcat's below */
 789                 *msg = 0;
 790
 791         if (errs & E_SUM_PKTERRS) {
 792                 ipath_stats.sps_pkterrs++;
 793                 chkerrpkts = 1;
 794         }
 795         if (errs & E_SUM_ERRS)
 796                 ipath_stats.sps_errs++;
 797
 798         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
 799                 ipath_stats.sps_crcerrs++;
 800                 chkerrpkts = 1;
 801         }
 802         iserr = errs & ~(E_SUM_PKTERRS | INFINIPATH_E_PKTERRS);
 803
 804
 805         /*
 806          * We don't want to print these two as they happen, or we can make
 807          * the situation even worse, because it takes so long to print
 808          * messages to serial consoles.  Kernel ports get printed from
 809          * fast_stats, no more than every 5 seconds, user ports get printed
 810          * on close
 811          */
 812         if (errs & INFINIPATH_E_RRCVHDRFULL)
 813                 chkerrpkts |= handle_hdrq_full(dd);
 814         if (errs & INFINIPATH_E_RRCVEGRFULL) {
 815                 struct ipath_portdata *pd = dd->ipath_pd[0];
 816
 817                 /*
 818                  * since this is of less importance and not likely to
 819                  * happen without also getting hdrfull, only count
 820                  * occurrences; don't check each port (or even the kernel
 821                  * vs user)
 822                  */
 823                 ipath_stats.sps_etidfull++;
 824                 if (pd->port_head != ipath_get_hdrqtail(pd))
 825                         chkerrpkts |= 1;
 826         }
 827
 828         /*
 829          * do this before IBSTATUSCHANGED, in case both bits set in a single
 830          * interrupt; we want the STATUSCHANGE to "win", so we do our
 831          * internal copy of state machine correctly
 832          */
 833         if (errs & INFINIPATH_E_RIBLOSTLINK) {
 834                 /*
 835                  * force through block below
 836                  */
 837                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
 838                 ipath_stats.sps_iblink++;
 839                 dd->ipath_flags |= IPATH_LINKDOWN;
 840                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 841                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
 842                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 843
 844                 ipath_dbg("Lost link, link now down (%s)\n",
 845                         ipath_ibcstatus_str[ipath_read_kreg64(dd,
 846                         dd->ipath_kregs->kr_ibcstatus) & 0xf]);
 847         }
 848         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
 849                 handle_e_ibstatuschanged(dd, errs);
 850
 851         if (errs & INFINIPATH_E_RESET) {
 852                 if (!noprint)
 853                         ipath_dev_err(dd, "Got reset, requires re-init "
 854                                       "(unload and reload driver)\n");
 855                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
 856                 /* mark as having had error */
 857                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 858                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
 859         }
 860
 861         if (!noprint && *msg) {
 862                 if (iserr)
 863                         ipath_dev_err(dd, "%s error\n", msg);
 864         }
 865         if (dd->ipath_state_wanted & dd->ipath_flags) {
 866                 ipath_cdbg(VERBOSE, "driver wanted state %x, iflags now %x, "
 867                            "waking\n", dd->ipath_state_wanted,
 868                            dd->ipath_flags);
 869                 wake_up_interruptible(&ipath_state_wait);
 870         }
 871
 872         return chkerrpkts;
 873 }
 874
 875 /*
 876  * try to cleanup as much as possible for anything that might have gone
 877  * wrong while in freeze mode, such as pio buffers being written by user
 878  * processes (causing armlaunch), send errors due to going into freeze mode,
 879  * etc., and try to avoid causing extra interrupts while doing so.
 880  * Forcibly update the in-memory pioavail register copies after cleanup
 881  * because the chip won't do it while in freeze mode (the register values
 882  * themselves are kept correct).
 883  * Make sure that we don't lose any important interrupts by using the chip
 884  * feature that says that writing 0 to a bit in *clear that is set in
 885  * *status will cause an interrupt to be generated again (if allowed by
 886  * the *mask value).
 887  */
 888 void ipath_clear_freeze(struct ipath_devdata *dd)
 889 {
 890         /* disable error interrupts, to avoid confusion */
 891         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask, 0ULL);
 892
 893         /* also disable interrupts; errormask is sometimes overwriten */
 894         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 895
 896         ipath_cancel_sends(dd, 1);
 897
 898         /* clear the freeze, and be sure chip saw it */
 899         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 900                          dd->ipath_control);
 901         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 902
 903         /* force in-memory update now we are out of freeze */
 904         ipath_force_pio_avail_update(dd);
 905
 906         /*
 907          * force new interrupt if any hwerr, error or interrupt bits are
 908          * still set, and clear "safe" send packet errors related to freeze
 909          * and cancelling sends.  Re-enable error interrupts before possible
 910          * force of re-interrupt on pending interrupts.
 911          */
 912         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
 913         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 914                 E_SPKT_ERRS_IGNORE);
 915         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 916                 dd->ipath_errormask);
 917         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, -1LL);
 918         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 919 }
 920
 921
 922 /* this is separate to allow for better optimization of ipath_intr() */
 923
 924 static noinline void ipath_bad_intr(struct ipath_devdata *dd, u32 *unexpectp)
 925 {
 926         /*
 927          * sometimes happen during driver init and unload, don't want
 928          * to process any interrupts at that point
 929          */
 930
 931         /* this is just a bandaid, not a fix, if something goes badly
 932          * wrong */
 933         if (++*unexpectp > 100) {
 934                 if (++*unexpectp > 105) {
 935                         /*
 936                          * ok, we must be taking somebody else's interrupts,
 937                          * due to a messed up mptable and/or PIRQ table, so
 938                          * unregister the interrupt.  We've seen this during
 939                          * linuxbios development work, and it may happen in
 940                          * the future again.
 941                          */
 942                         if (dd->pcidev && dd->ipath_irq) {
 943                                 ipath_dev_err(dd, "Now %u unexpected "
 944                                               "interrupts, unregistering "
 945                                               "interrupt handler\n",
 946                                               *unexpectp);
 947                                 ipath_dbg("free_irq of irq %d\n",
 948                                           dd->ipath_irq);
 949                                 dd->ipath_f_free_irq(dd);
 950                         }
 951                 }
 952                 if (ipath_read_ireg(dd, dd->ipath_kregs->kr_intmask)) {
 953                         ipath_dev_err(dd, "%u unexpected interrupts, "
 954                                       "disabling interrupts completely\n",
 955                                       *unexpectp);
 956                         /*
 957                          * disable all interrupts, something is very wrong
 958                          */
 959                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 960                                          0ULL);
 961                 }
 962         } else if (*unexpectp > 1)
 963                 ipath_dbg("Interrupt when not ready, should not happen, "
 964                           "ignoring\n");
 965 }
 966
 967 static noinline void ipath_bad_regread(struct ipath_devdata *dd)
 968 {
 969         static int allbits;
 970
 971         /* separate routine, for better optimization of ipath_intr() */
 972
 973         /*
 974          * We print the message and disable interrupts, in hope of
 975          * having a better chance of debugging the problem.
 976          */
 977         ipath_dev_err(dd,
 978                       "Read of interrupt status failed (all bits set)\n");
 979         if (allbits++) {
 980                 /* disable all interrupts, something is very wrong */
 981                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 982                 if (allbits == 2) {
 983                         ipath_dev_err(dd, "Still bad interrupt status, "
 984                                       "unregistering interrupt\n");
 985                         dd->ipath_f_free_irq(dd);
 986                 } else if (allbits > 2) {
 987                         if ((allbits % 10000) == 0)
 988                                 printk(".");
 989                 } else
 990                         ipath_dev_err(dd, "Disabling interrupts, "
 991                                       "multiple errors\n");
 992         }
 993 }
 994
 995 static void handle_layer_pioavail(struct ipath_devdata *dd)
 996 {
 997         unsigned long flags;
 998         int ret;
 999
1000         ret = ipath_ib_piobufavail(dd->verbs_dev);
1001         if (ret > 0)
1002                 goto set;
1003
1004         return;
1005 set:
1006         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1007         dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL;
1008         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1009                          dd->ipath_sendctrl);
1010         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1011         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1012 }
1013
1014 /*
1015  * Handle receive interrupts for user ports; this means a user
1016  * process was waiting for a packet to arrive, and didn't want
1017  * to poll
1018  */
1019 static void handle_urcv(struct ipath_devdata *dd, u64 istat)
1020 {
1021         u64 portr;
1022         int i;
1023         int rcvdint = 0;
1024
1025         /*
1026          * test_and_clear_bit(IPATH_PORT_WAITING_RCV) and
1027          * test_and_clear_bit(IPATH_PORT_WAITING_URG) below
1028          * would both like timely updates of the bits so that
1029          * we don't pass them by unnecessarily.  the rmb()
1030          * here ensures that we see them promptly -- the
1031          * corresponding wmb()'s are in ipath_poll_urgent()
1032          * and ipath_poll_next()...
1033          */
1034         rmb();
1035         portr = ((istat >> dd->ipath_i_rcvavail_shift) &
1036                  dd->ipath_i_rcvavail_mask) |
1037                 ((istat >> dd->ipath_i_rcvurg_shift) &
1038                  dd->ipath_i_rcvurg_mask);
1039         for (i = 1; i < dd->ipath_cfgports; i++) {
1040                 struct ipath_portdata *pd = dd->ipath_pd[i];
1041
1042                 if (portr & (1 << i) && pd && pd->port_cnt) {
1043                         if (test_and_clear_bit(IPATH_PORT_WAITING_RCV,
1044                                                &pd->port_flag)) {
1045                                 clear_bit(i + dd->ipath_r_intravail_shift,
1046                                           &dd->ipath_rcvctrl);
1047                                 wake_up_interruptible(&pd->port_wait);
1048                                 rcvdint = 1;
1049                         } else if (test_and_clear_bit(IPATH_PORT_WAITING_URG,
1050                                                       &pd->port_flag)) {
1051                                 pd->port_urgent++;
1052                                 wake_up_interruptible(&pd->port_wait);
1053                         }
1054                 }
1055         }
1056         if (rcvdint) {
1057                 /* only want to take one interrupt, so turn off the rcv
1058                  * interrupt for all the ports that we set the rcv_waiting
1059                  * (but never for kernel port)
1060                  */
1061                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1062                                  dd->ipath_rcvctrl);
1063         }
1064 }
1065
1066 irqreturn_t ipath_intr(int irq, void *data)
1067 {
1068         struct ipath_devdata *dd = data;
1069         u64 istat, chk0rcv = 0;
1070         ipath_err_t estat = 0;
1071         irqreturn_t ret;
1072         static unsigned unexpected = 0;
1073         u64 kportrbits;
1074
1075         ipath_stats.sps_ints++;
1076
1077         if (dd->ipath_int_counter != (u32) -1)
1078                 dd->ipath_int_counter++;
1079
1080         if (!(dd->ipath_flags & IPATH_PRESENT)) {
1081                 /*
1082                  * This return value is not great, but we do not want the
1083                  * interrupt core code to remove our interrupt handler
1084                  * because we don't appear to be handling an interrupt
1085                  * during a chip reset.
1086                  */
1087                 return IRQ_HANDLED;
1088         }
1089
1090         /*
1091          * this needs to be flags&initted, not statusp, so we keep
1092          * taking interrupts even after link goes down, etc.
1093          * Also, we *must* clear the interrupt at some point, or we won't
1094          * take it again, which can be real bad for errors, etc...
1095          */
1096
1097         if (!(dd->ipath_flags & IPATH_INITTED)) {
1098                 ipath_bad_intr(dd, &unexpected);
1099                 ret = IRQ_NONE;
1100                 goto bail;
1101         }
1102
1103         istat = ipath_read_ireg(dd, dd->ipath_kregs->kr_intstatus);
1104
1105         if (unlikely(!istat)) {
1106                 ipath_stats.sps_nullintr++;
1107                 ret = IRQ_NONE; /* not our interrupt, or already handled */
1108                 goto bail;
1109         }
1110         if (unlikely(istat == -1)) {
1111                 ipath_bad_regread(dd);
1112                 /* don't know if it was our interrupt or not */
1113                 ret = IRQ_NONE;
1114                 goto bail;
1115         }
1116
1117         if (unexpected)
1118                 unexpected = 0;
1119
1120         if (unlikely(istat & ~dd->ipath_i_bitsextant))
1121                 ipath_dev_err(dd,
1122                               "interrupt with unknown interrupts %Lx set\n",
1123                               (unsigned long long)
1124                               istat & ~dd->ipath_i_bitsextant);
1125         else if (istat & ~INFINIPATH_I_ERROR) /* errors do own printing */
1126                 ipath_cdbg(VERBOSE, "intr stat=0x%Lx\n",
1127                         (unsigned long long) istat);
1128
1129         if (istat & INFINIPATH_I_ERROR) {
1130                 ipath_stats.sps_errints++;
1131                 estat = ipath_read_kreg64(dd,
1132                                           dd->ipath_kregs->kr_errorstatus);
1133                 if (!estat)
1134                         dev_info(&dd->pcidev->dev, "error interrupt (%Lx), "
1135                                  "but no error bits set!\n",
1136                                  (unsigned long long) istat);
1137                 else if (estat == -1LL)
1138                         /*
1139                          * should we try clearing all, or hope next read
1140                          * works?
1141                          */
1142                         ipath_dev_err(dd, "Read of error status failed "
1143                                       "(all bits set); ignoring\n");
1144                 else
1145                         chk0rcv |= handle_errors(dd, estat);
1146         }
1147
1148         if (istat & INFINIPATH_I_GPIO) {
1149                 /*
1150                  * GPIO interrupts fall in two broad classes:
1151                  * GPIO_2 indicates (on some HT4xx boards) that a packet
1152                  *        has arrived for Port 0. Checking for this
1153                  *        is controlled by flag IPATH_GPIO_INTR.
1154                  * GPIO_3..5 on IBA6120 Rev2 and IBA6110 Rev4 chips indicate
1155                  *        errors that we need to count. Checking for this
1156                  *        is controlled by flag IPATH_GPIO_ERRINTRS.
1157                  */
1158                 u32 gpiostatus;
1159                 u32 to_clear = 0;
1160
1161                 gpiostatus = ipath_read_kreg32(
1162                         dd, dd->ipath_kregs->kr_gpio_status);
1163                 /* First the error-counter case. */
1164                 if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) &&
1165                     (dd->ipath_flags & IPATH_GPIO_ERRINTRS)) {
1166                         /* want to clear the bits we see asserted. */
1167                         to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK);
1168
1169                         /*
1170                          * Count appropriately, clear bits out of our copy,
1171                          * as they have been "handled".
1172                          */
1173                         if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) {
1174                                 ipath_dbg("FlowCtl on UnsupVL\n");
1175                                 dd->ipath_rxfc_unsupvl_errs++;
1176                         }
1177                         if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) {
1178                                 ipath_dbg("Overrun Threshold exceeded\n");
1179                                 dd->ipath_overrun_thresh_errs++;
1180                         }
1181                         if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) {
1182                                 ipath_dbg("Local Link Integrity error\n");
1183                                 dd->ipath_lli_errs++;
1184                         }
1185                         gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK;
1186                 }
1187                 /* Now the Port0 Receive case */
1188                 if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) &&
1189                     (dd->ipath_flags & IPATH_GPIO_INTR)) {
1190                         /*
1191                          * GPIO status bit 2 is set, and we expected it.
1192                          * clear it and indicate in p0bits.
1193                          * This probably only happens if a Port0 pkt
1194                          * arrives at _just_ the wrong time, and we
1195                          * handle that by seting chk0rcv;
1196                          */
1197                         to_clear |= (1 << IPATH_GPIO_PORT0_BIT);
1198                         gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT);
1199                         chk0rcv = 1;
1200                 }
1201                 if (gpiostatus) {
1202                         /*
1203                          * Some unexpected bits remain. If they could have
1204                          * caused the interrupt, complain and clear.
1205                          * To avoid repetition of this condition, also clear
1206                          * the mask. It is almost certainly due to error.
1207                          */
1208                         const u32 mask = (u32) dd->ipath_gpio_mask;
1209
1210                         if (mask & gpiostatus) {
1211                                 ipath_dbg("Unexpected GPIO IRQ bits %x\n",
1212                                   gpiostatus & mask);
1213                                 to_clear |= (gpiostatus & mask);
1214                                 dd->ipath_gpio_mask &= ~(gpiostatus & mask);
1215                                 ipath_write_kreg(dd,
1216                                         dd->ipath_kregs->kr_gpio_mask,
1217                                         dd->ipath_gpio_mask);
1218                         }
1219                 }
1220                 if (to_clear) {
1221                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
1222                                         (u64) to_clear);
1223                 }
1224         }
1225
1226         /*
1227          * Clear the interrupt bits we found set, unless they are receive
1228          * related, in which case we already cleared them above, and don't
1229          * want to clear them again, because we might lose an interrupt.
1230          * Clear it early, so we "know" know the chip will have seen this by
1231          * the time we process the queue, and will re-interrupt if necessary.
1232          * The processor itself won't take the interrupt again until we return.
1233          */
1234         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
1235
1236         /*
1237          * Handle kernel receive queues before checking for pio buffers
1238          * available since receives can overflow; piobuf waiters can afford
1239          * a few extra cycles, since they were waiting anyway, and user's
1240          * waiting for receive are at the bottom.
1241          */
1242         kportrbits = (1ULL << dd->ipath_i_rcvavail_shift) |
1243                 (1ULL << dd->ipath_i_rcvurg_shift);
1244         if (chk0rcv || (istat & kportrbits)) {
1245                 istat &= ~kportrbits;
1246                 ipath_kreceive(dd->ipath_pd[0]);
1247         }
1248
1249         if (istat & ((dd->ipath_i_rcvavail_mask << dd->ipath_i_rcvavail_shift) |
1250                      (dd->ipath_i_rcvurg_mask << dd->ipath_i_rcvurg_shift)))
1251                 handle_urcv(dd, istat);
1252
1253         if (istat & (INFINIPATH_I_SDMAINT | INFINIPATH_I_SDMADISABLED))
1254                 handle_sdma_intr(dd, istat);
1255
1256         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
1257                 unsigned long flags;
1258
1259                 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1260                 dd->ipath_sendctrl &= ~INFINIPATH_S_PIOINTBUFAVAIL;
1261                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1262                                  dd->ipath_sendctrl);
1263                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1264                 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1265
1266                 /* always process; sdma verbs uses PIO for acks and VL15  */
1267                 handle_layer_pioavail(dd);
1268         }
1269
1270         ret = IRQ_HANDLED;
1271
1272 bail:
1273         return ret;
1274 }