kernel/drivers/staging/rdma/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                         time_after(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             ARRAY_SIZE(ipath_generic_hwerror_msgs);
 212
 213         for (i=0; i<glen; i++) {
 214                 if (hwerrs & ipath_generic_hwerror_msgs[i].mask) {
 215                         ipath_format_hwmsg(msg, msgl,
 216                                            ipath_generic_hwerror_msgs[i].msg);
 217                 }
 218         }
 219
 220         for (i=0; i<nhwerrmsgs; i++) {
 221                 if (hwerrs & hwerrmsgs[i].mask) {
 222                         ipath_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
 223                 }
 224         }
 225 }
 226
 227 /* return the strings for the most common link states */
 228 static char *ib_linkstate(struct ipath_devdata *dd, u64 ibcs)
 229 {
 230         char *ret;
 231         u32 state;
 232
 233         state = ipath_ib_state(dd, ibcs);
 234         if (state == dd->ib_init)
 235                 ret = "Init";
 236         else if (state == dd->ib_arm)
 237                 ret = "Arm";
 238         else if (state == dd->ib_active)
 239                 ret = "Active";
 240         else
 241                 ret = "Down";
 242         return ret;
 243 }
 244
 245 void signal_ib_event(struct ipath_devdata *dd, enum ib_event_type ev)
 246 {
 247         struct ib_event event;
 248
 249         event.device = &dd->verbs_dev->ibdev;
 250         event.element.port_num = 1;
 251         event.event = ev;
 252         ib_dispatch_event(&event);
 253 }
 254
 255 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 256                                      ipath_err_t errs)
 257 {
 258         u32 ltstate, lstate, ibstate, lastlstate;
 259         u32 init = dd->ib_init;
 260         u32 arm = dd->ib_arm;
 261         u32 active = dd->ib_active;
 262         const u64 ibcs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
 263
 264         lstate = ipath_ib_linkstate(dd, ibcs); /* linkstate */
 265         ibstate = ipath_ib_state(dd, ibcs);
 266         /* linkstate at last interrupt */
 267         lastlstate = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
 268         ltstate = ipath_ib_linktrstate(dd, ibcs); /* linktrainingtate */
 269
 270         /*
 271          * Since going into a recovery state causes the link state to go
 272          * down and since recovery is transitory, it is better if we "miss"
 273          * ever seeing the link training state go into recovery (i.e.,
 274          * ignore this transition for link state special handling purposes)
 275          * without even updating ipath_lastibcstat.
 276          */
 277         if ((ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN) ||
 278             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT) ||
 279             (ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERIDLE))
 280                 goto done;
 281
 282         /*
 283          * if linkstate transitions into INIT from any of the various down
 284          * states, or if it transitions from any of the up (INIT or better)
 285          * states into any of the down states (except link recovery), then
 286          * call the chip-specific code to take appropriate actions.
 287          */
 288         if (lstate >= INFINIPATH_IBCS_L_STATE_INIT &&
 289                 lastlstate == INFINIPATH_IBCS_L_STATE_DOWN) {
 290                 /* transitioned to UP */
 291                 if (dd->ipath_f_ib_updown(dd, 1, ibcs)) {
 292                         /* link came up, so we must no longer be disabled */
 293                         dd->ipath_flags &= ~IPATH_IB_LINK_DISABLED;
 294                         ipath_cdbg(LINKVERB, "LinkUp handled, skipped\n");
 295                         goto skip_ibchange; /* chip-code handled */
 296                 }
 297         } else if ((lastlstate >= INFINIPATH_IBCS_L_STATE_INIT ||
 298                 (dd->ipath_flags & IPATH_IB_FORCE_NOTIFY)) &&
 299                 ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT &&
 300                 ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
 301                 int handled;
 302                 handled = dd->ipath_f_ib_updown(dd, 0, ibcs);
 303                 dd->ipath_flags &= ~IPATH_IB_FORCE_NOTIFY;
 304                 if (handled) {
 305                         ipath_cdbg(LINKVERB, "LinkDown handled, skipped\n");
 306                         goto skip_ibchange; /* chip-code handled */
 307                 }
 308         }
 309
 310         /*
 311          * Significant enough to always print and get into logs, if it was
 312          * unexpected.  If it was a requested state change, we'll have
 313          * already cleared the flags, so we won't print this warning
 314          */
 315         if ((ibstate != arm && ibstate != active) &&
 316             (dd->ipath_flags & (IPATH_LINKARMED | IPATH_LINKACTIVE))) {
 317                 dev_info(&dd->pcidev->dev, "Link state changed from %s "
 318                          "to %s\n", (dd->ipath_flags & IPATH_LINKARMED) ?
 319                          "ARM" : "ACTIVE", ib_linkstate(dd, ibcs));
 320         }
 321
 322         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 323             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 324                 u32 lastlts;
 325                 lastlts = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
 326                 /*
 327                  * Ignore cycling back and forth from Polling.Active to
 328                  * Polling.Quiet while waiting for the other end of the link
 329                  * to come up, except to try and decide if we are connected
 330                  * to a live IB device or not.  We will cycle back and
 331                  * forth between them if no cable is plugged in, the other
 332                  * device is powered off or disabled, etc.
 333                  */
 334                 if (lastlts == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
 335                     lastlts == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
 336                         if (!(dd->ipath_flags & IPATH_IB_AUTONEG_INPROG) &&
 337                              (++dd->ipath_ibpollcnt == 40)) {
 338                                 dd->ipath_flags |= IPATH_NOCABLE;
 339                                 *dd->ipath_statusp |=
 340                                         IPATH_STATUS_IB_NOCABLE;
 341                                 ipath_cdbg(LINKVERB, "Set NOCABLE\n");
 342                         }
 343                         ipath_cdbg(LINKVERB, "POLL change to %s (%x)\n",
 344                                 ipath_ibcstatus_str[ltstate], ibstate);
 345                         goto skip_ibchange;
 346                 }
 347         }
 348
 349         dd->ipath_ibpollcnt = 0; /* not poll*, now */
 350         ipath_stats.sps_iblink++;
 351
 352         if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
 353                 u64 linkrecov;
 354                 linkrecov = ipath_snap_cntr(dd,
 355                         dd->ipath_cregs->cr_iblinkerrrecovcnt);
 356                 if (linkrecov != dd->ipath_lastlinkrecov) {
 357                         ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
 358                                 (unsigned long long) ibcs,
 359                                 ib_linkstate(dd, ibcs),
 360                                 ipath_ibcstatus_str[ltstate],
 361                                 (unsigned long long) 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                 } else if (supp_msgs) {
 517                         handle_supp_msgs(dd, supp_msgs, msg, msgsz);
 518                         supp_msgs = 0;
 519                         nmsgs = 0;
 520                 }
 521         } else if (!nmsgs++ || time_after(nc, nextmsg_time)) {
 522                 nextmsg_time = nc + HZ / 2;
 523         }
 524
 525         return supp_msgs;
 526 }
 527
 528 static void handle_sdma_errors(struct ipath_devdata *dd, ipath_err_t errs)
 529 {
 530         unsigned long flags;
 531         int expected;
 532
 533         if (ipath_debug & __IPATH_DBG) {
 534                 char msg[128];
 535                 ipath_decode_err(dd, msg, sizeof msg, errs &
 536                         INFINIPATH_E_SDMAERRS);
 537                 ipath_dbg("errors %lx (%s)\n", (unsigned long)errs, msg);
 538         }
 539         if (ipath_debug & __IPATH_VERBDBG) {
 540                 unsigned long tl, hd, status, lengen;
 541                 tl = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmatail);
 542                 hd = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmahead);
 543                 status = ipath_read_kreg64(dd
 544                         , dd->ipath_kregs->kr_senddmastatus);
 545                 lengen = ipath_read_kreg64(dd,
 546                         dd->ipath_kregs->kr_senddmalengen);
 547                 ipath_cdbg(VERBOSE, "sdma tl 0x%lx hd 0x%lx status 0x%lx "
 548                         "lengen 0x%lx\n", tl, hd, status, lengen);
 549         }
 550
 551         spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 552         __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 553         expected = test_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
 554         spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 555         if (!expected)
 556                 ipath_cancel_sends(dd, 1);
 557 }
 558
 559 static void handle_sdma_intr(struct ipath_devdata *dd, u64 istat)
 560 {
 561         unsigned long flags;
 562         int expected;
 563
 564         if ((istat & INFINIPATH_I_SDMAINT) &&
 565             !test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 566                 ipath_sdma_intr(dd);
 567
 568         if (istat & INFINIPATH_I_SDMADISABLED) {
 569                 expected = test_bit(IPATH_SDMA_ABORTING,
 570                         &dd->ipath_sdma_status);
 571                 ipath_dbg("%s SDmaDisabled intr\n",
 572                         expected ? "expected" : "unexpected");
 573                 spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
 574                 __set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
 575                 spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 576                 if (!expected)
 577                         ipath_cancel_sends(dd, 1);
 578                 if (!test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
 579                         tasklet_hi_schedule(&dd->ipath_sdma_abort_task);
 580         }
 581 }
 582
 583 static int handle_hdrq_full(struct ipath_devdata *dd)
 584 {
 585         int chkerrpkts = 0;
 586         u32 hd, tl;
 587         u32 i;
 588
 589         ipath_stats.sps_hdrqfull++;
 590         for (i = 0; i < dd->ipath_cfgports; i++) {
 591                 struct ipath_portdata *pd = dd->ipath_pd[i];
 592
 593                 if (i == 0) {
 594                         /*
 595                          * For kernel receive queues, we just want to know
 596                          * if there are packets in the queue that we can
 597                          * process.
 598                          */
 599                         if (pd->port_head != ipath_get_hdrqtail(pd))
 600                                 chkerrpkts |= 1 << i;
 601                         continue;
 602                 }
 603
 604                 /* Skip if user context is not open */
 605                 if (!pd || !pd->port_cnt)
 606                         continue;
 607
 608                 /* Don't report the same point multiple times. */
 609                 if (dd->ipath_flags & IPATH_NODMA_RTAIL)
 610                         tl = ipath_read_ureg32(dd, ur_rcvhdrtail, i);
 611                 else
 612                         tl = ipath_get_rcvhdrtail(pd);
 613                 if (tl == pd->port_lastrcvhdrqtail)
 614                         continue;
 615
 616                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead, i);
 617                 if (hd == (tl + 1) || (!hd && tl == dd->ipath_hdrqlast)) {
 618                         pd->port_lastrcvhdrqtail = tl;
 619                         pd->port_hdrqfull++;
 620                         /* flush hdrqfull so that poll() sees it */
 621                         wmb();
 622                         wake_up_interruptible(&pd->port_wait);
 623                 }
 624         }
 625
 626         return chkerrpkts;
 627 }
 628
 629 static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
 630 {
 631         char msg[128];
 632         u64 ignore_this_time = 0;
 633         u64 iserr = 0;
 634         int chkerrpkts = 0, noprint = 0;
 635         unsigned supp_msgs;
 636         int log_idx;
 637
 638         /*
 639          * don't report errors that are masked, either at init
 640          * (not set in ipath_errormask), or temporarily (set in
 641          * ipath_maskederrs)
 642          */
 643         errs &= dd->ipath_errormask & ~dd->ipath_maskederrs;
 644
 645         supp_msgs = handle_frequent_errors(dd, errs, msg, (u32)sizeof msg,
 646                 &noprint);
 647
 648         /* do these first, they are most important */
 649         if (errs & INFINIPATH_E_HARDWARE) {
 650                 /* reuse same msg buf */
 651                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
 652         } else {
 653                 u64 mask;
 654                 for (log_idx = 0; log_idx < IPATH_EEP_LOG_CNT; ++log_idx) {
 655                         mask = dd->ipath_eep_st_masks[log_idx].errs_to_log;
 656                         if (errs & mask)
 657                                 ipath_inc_eeprom_err(dd, log_idx, 1);
 658                 }
 659         }
 660
 661         if (errs & INFINIPATH_E_SDMAERRS)
 662                 handle_sdma_errors(dd, errs);
 663
 664         if (!noprint && (errs & ~dd->ipath_e_bitsextant))
 665                 ipath_dev_err(dd, "error interrupt with unknown errors "
 666                               "%llx set\n", (unsigned long long)
 667                               (errs & ~dd->ipath_e_bitsextant));
 668
 669         if (errs & E_SUM_ERRS)
 670                 ignore_this_time = handle_e_sum_errs(dd, errs);
 671         else if ((errs & E_SUM_LINK_PKTERRS) &&
 672             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
 673                 /*
 674                  * This can happen when SMA is trying to bring the link
 675                  * up, but the IB link changes state at the "wrong" time.
 676                  * The IB logic then complains that the packet isn't
 677                  * valid.  We don't want to confuse people, so we just
 678                  * don't print them, except at debug
 679                  */
 680                 ipath_dbg("Ignoring packet errors %llx, because link not "
 681                           "ACTIVE\n", (unsigned long long) errs);
 682                 ignore_this_time = errs & E_SUM_LINK_PKTERRS;
 683         }
 684
 685         if (supp_msgs == 250000) {
 686                 int s_iserr;
 687                 /*
 688                  * It's not entirely reasonable assuming that the errors set
 689                  * in the last clear period are all responsible for the
 690                  * problem, but the alternative is to assume it's the only
 691                  * ones on this particular interrupt, which also isn't great
 692                  */
 693                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
 694
 695                 dd->ipath_errormask &= ~dd->ipath_maskederrs;
 696                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 697                                  dd->ipath_errormask);
 698                 s_iserr = ipath_decode_err(dd, msg, sizeof msg,
 699                                            dd->ipath_maskederrs);
 700
 701                 if (dd->ipath_maskederrs &
 702                     ~(INFINIPATH_E_RRCVEGRFULL |
 703                       INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
 704                         ipath_dev_err(dd, "Temporarily disabling "
 705                             "error(s) %llx reporting; too frequent (%s)\n",
 706                                 (unsigned long long) dd->ipath_maskederrs,
 707                                 msg);
 708                 else {
 709                         /*
 710                          * rcvegrfull and rcvhdrqfull are "normal",
 711                          * for some types of processes (mostly benchmarks)
 712                          * that send huge numbers of messages, while not
 713                          * processing them.  So only complain about
 714                          * these at debug level.
 715                          */
 716                         if (s_iserr)
 717                                 ipath_dbg("Temporarily disabling reporting "
 718                                     "too frequent queue full errors (%s)\n",
 719                                     msg);
 720                         else
 721                                 ipath_cdbg(ERRPKT,
 722                                     "Temporarily disabling reporting too"
 723                                     " frequent packet errors (%s)\n",
 724                                     msg);
 725                 }
 726
 727                 /*
 728                  * Re-enable the masked errors after around 3 minutes.  in
 729                  * ipath_get_faststats().  If we have a series of fast
 730                  * repeating but different errors, the interval will keep
 731                  * stretching out, but that's OK, as that's pretty
 732                  * catastrophic.
 733                  */
 734                 dd->ipath_unmasktime = jiffies + HZ * 180;
 735         }
 736
 737         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
 738         if (ignore_this_time)
 739                 errs &= ~ignore_this_time;
 740         if (errs & ~dd->ipath_lasterror) {
 741                 errs &= ~dd->ipath_lasterror;
 742                 /* never suppress duplicate hwerrors or ibstatuschange */
 743                 dd->ipath_lasterror |= errs &
 744                         ~(INFINIPATH_E_HARDWARE |
 745                           INFINIPATH_E_IBSTATUSCHANGED);
 746         }
 747
 748         if (errs & INFINIPATH_E_SENDSPECIALTRIGGER) {
 749                 dd->ipath_spectriggerhit++;
 750                 ipath_dbg("%lu special trigger hits\n",
 751                         dd->ipath_spectriggerhit);
 752         }
 753
 754         /* likely due to cancel; so suppress message unless verbose */
 755         if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
 756                 time_after(dd->ipath_lastcancel, jiffies)) {
 757                 /* armlaunch takes precedence; it often causes both. */
 758                 ipath_cdbg(VERBOSE,
 759                         "Suppressed %s error (%llx) after sendbuf cancel\n",
 760                         (errs &  INFINIPATH_E_SPIOARMLAUNCH) ?
 761                         "armlaunch" : "sendpktlen", (unsigned long long)errs);
 762                 errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
 763         }
 764
 765         if (!errs)
 766                 return 0;
 767
 768         if (!noprint) {
 769                 ipath_err_t mask;
 770                 /*
 771                  * The ones we mask off are handled specially below
 772                  * or above.  Also mask SDMADISABLED by default as it
 773                  * is too chatty.
 774                  */
 775                 mask = INFINIPATH_E_IBSTATUSCHANGED |
 776                         INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 777                         INFINIPATH_E_HARDWARE | INFINIPATH_E_SDMADISABLED;
 778
 779                 /* if we're in debug, then don't mask SDMADISABLED msgs */
 780                 if (ipath_debug & __IPATH_DBG)
 781                         mask &= ~INFINIPATH_E_SDMADISABLED;
 782
 783                 ipath_decode_err(dd, msg, sizeof msg, errs & ~mask);
 784         } else
 785                 /* so we don't need if (!noprint) at strlcat's below */
 786                 *msg = 0;
 787
 788         if (errs & E_SUM_PKTERRS) {
 789                 ipath_stats.sps_pkterrs++;
 790                 chkerrpkts = 1;
 791         }
 792         if (errs & E_SUM_ERRS)
 793                 ipath_stats.sps_errs++;
 794
 795         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
 796                 ipath_stats.sps_crcerrs++;
 797                 chkerrpkts = 1;
 798         }
 799         iserr = errs & ~(E_SUM_PKTERRS | INFINIPATH_E_PKTERRS);
 800
 801
 802         /*
 803          * We don't want to print these two as they happen, or we can make
 804          * the situation even worse, because it takes so long to print
 805          * messages to serial consoles.  Kernel ports get printed from
 806          * fast_stats, no more than every 5 seconds, user ports get printed
 807          * on close
 808          */
 809         if (errs & INFINIPATH_E_RRCVHDRFULL)
 810                 chkerrpkts |= handle_hdrq_full(dd);
 811         if (errs & INFINIPATH_E_RRCVEGRFULL) {
 812                 struct ipath_portdata *pd = dd->ipath_pd[0];
 813
 814                 /*
 815                  * since this is of less importance and not likely to
 816                  * happen without also getting hdrfull, only count
 817                  * occurrences; don't check each port (or even the kernel
 818                  * vs user)
 819                  */
 820                 ipath_stats.sps_etidfull++;
 821                 if (pd->port_head != ipath_get_hdrqtail(pd))
 822                         chkerrpkts |= 1;
 823         }
 824
 825         /*
 826          * do this before IBSTATUSCHANGED, in case both bits set in a single
 827          * interrupt; we want the STATUSCHANGE to "win", so we do our
 828          * internal copy of state machine correctly
 829          */
 830         if (errs & INFINIPATH_E_RIBLOSTLINK) {
 831                 /*
 832                  * force through block below
 833                  */
 834                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
 835                 ipath_stats.sps_iblink++;
 836                 dd->ipath_flags |= IPATH_LINKDOWN;
 837                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
 838                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
 839                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
 840
 841                 ipath_dbg("Lost link, link now down (%s)\n",
 842                         ipath_ibcstatus_str[ipath_read_kreg64(dd,
 843                         dd->ipath_kregs->kr_ibcstatus) & 0xf]);
 844         }
 845         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
 846                 handle_e_ibstatuschanged(dd, errs);
 847
 848         if (errs & INFINIPATH_E_RESET) {
 849                 if (!noprint)
 850                         ipath_dev_err(dd, "Got reset, requires re-init "
 851                                       "(unload and reload driver)\n");
 852                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
 853                 /* mark as having had error */
 854                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
 855                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
 856         }
 857
 858         if (!noprint && *msg) {
 859                 if (iserr)
 860                         ipath_dev_err(dd, "%s error\n", msg);
 861         }
 862         if (dd->ipath_state_wanted & dd->ipath_flags) {
 863                 ipath_cdbg(VERBOSE, "driver wanted state %x, iflags now %x, "
 864                            "waking\n", dd->ipath_state_wanted,
 865                            dd->ipath_flags);
 866                 wake_up_interruptible(&ipath_state_wait);
 867         }
 868
 869         return chkerrpkts;
 870 }
 871
 872 /*
 873  * try to cleanup as much as possible for anything that might have gone
 874  * wrong while in freeze mode, such as pio buffers being written by user
 875  * processes (causing armlaunch), send errors due to going into freeze mode,
 876  * etc., and try to avoid causing extra interrupts while doing so.
 877  * Forcibly update the in-memory pioavail register copies after cleanup
 878  * because the chip won't do it while in freeze mode (the register values
 879  * themselves are kept correct).
 880  * Make sure that we don't lose any important interrupts by using the chip
 881  * feature that says that writing 0 to a bit in *clear that is set in
 882  * *status will cause an interrupt to be generated again (if allowed by
 883  * the *mask value).
 884  */
 885 void ipath_clear_freeze(struct ipath_devdata *dd)
 886 {
 887         /* disable error interrupts, to avoid confusion */
 888         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask, 0ULL);
 889
 890         /* also disable interrupts; errormask is sometimes overwriten */
 891         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 892
 893         ipath_cancel_sends(dd, 1);
 894
 895         /* clear the freeze, and be sure chip saw it */
 896         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 897                          dd->ipath_control);
 898         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 899
 900         /* force in-memory update now we are out of freeze */
 901         ipath_force_pio_avail_update(dd);
 902
 903         /*
 904          * force new interrupt if any hwerr, error or interrupt bits are
 905          * still set, and clear "safe" send packet errors related to freeze
 906          * and cancelling sends.  Re-enable error interrupts before possible
 907          * force of re-interrupt on pending interrupts.
 908          */
 909         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
 910         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 911                 E_SPKT_ERRS_IGNORE);
 912         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 913                 dd->ipath_errormask);
 914         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, -1LL);
 915         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 916 }
 917
 918
 919 /* this is separate to allow for better optimization of ipath_intr() */
 920
 921 static noinline void ipath_bad_intr(struct ipath_devdata *dd, u32 *unexpectp)
 922 {
 923         /*
 924          * sometimes happen during driver init and unload, don't want
 925          * to process any interrupts at that point
 926          */
 927
 928         /* this is just a bandaid, not a fix, if something goes badly
 929          * wrong */
 930         if (++*unexpectp > 100) {
 931                 if (++*unexpectp > 105) {
 932                         /*
 933                          * ok, we must be taking somebody else's interrupts,
 934                          * due to a messed up mptable and/or PIRQ table, so
 935                          * unregister the interrupt.  We've seen this during
 936                          * linuxbios development work, and it may happen in
 937                          * the future again.
 938                          */
 939                         if (dd->pcidev && dd->ipath_irq) {
 940                                 ipath_dev_err(dd, "Now %u unexpected "
 941                                               "interrupts, unregistering "
 942                                               "interrupt handler\n",
 943                                               *unexpectp);
 944                                 ipath_dbg("free_irq of irq %d\n",
 945                                           dd->ipath_irq);
 946                                 dd->ipath_f_free_irq(dd);
 947                         }
 948                 }
 949                 if (ipath_read_ireg(dd, dd->ipath_kregs->kr_intmask)) {
 950                         ipath_dev_err(dd, "%u unexpected interrupts, "
 951                                       "disabling interrupts completely\n",
 952                                       *unexpectp);
 953                         /*
 954                          * disable all interrupts, something is very wrong
 955                          */
 956                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 957                                          0ULL);
 958                 }
 959         } else if (*unexpectp > 1)
 960                 ipath_dbg("Interrupt when not ready, should not happen, "
 961                           "ignoring\n");
 962 }
 963
 964 static noinline void ipath_bad_regread(struct ipath_devdata *dd)
 965 {
 966         static int allbits;
 967
 968         /* separate routine, for better optimization of ipath_intr() */
 969
 970         /*
 971          * We print the message and disable interrupts, in hope of
 972          * having a better chance of debugging the problem.
 973          */
 974         ipath_dev_err(dd,
 975                       "Read of interrupt status failed (all bits set)\n");
 976         if (allbits++) {
 977                 /* disable all interrupts, something is very wrong */
 978                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
 979                 if (allbits == 2) {
 980                         ipath_dev_err(dd, "Still bad interrupt status, "
 981                                       "unregistering interrupt\n");
 982                         dd->ipath_f_free_irq(dd);
 983                 } else if (allbits > 2) {
 984                         if ((allbits % 10000) == 0)
 985                                 printk(".");
 986                 } else
 987                         ipath_dev_err(dd, "Disabling interrupts, "
 988                                       "multiple errors\n");
 989         }
 990 }
 991
 992 static void handle_layer_pioavail(struct ipath_devdata *dd)
 993 {
 994         unsigned long flags;
 995         int ret;
 996
 997         ret = ipath_ib_piobufavail(dd->verbs_dev);
 998         if (ret > 0)
 999                 goto set;
1000
1001         return;
1002 set:
1003         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1004         dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL;
1005         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1006                          dd->ipath_sendctrl);
1007         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1008         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1009 }
1010
1011 /*
1012  * Handle receive interrupts for user ports; this means a user
1013  * process was waiting for a packet to arrive, and didn't want
1014  * to poll
1015  */
1016 static void handle_urcv(struct ipath_devdata *dd, u64 istat)
1017 {
1018         u64 portr;
1019         int i;
1020         int rcvdint = 0;
1021
1022         /*
1023          * test_and_clear_bit(IPATH_PORT_WAITING_RCV) and
1024          * test_and_clear_bit(IPATH_PORT_WAITING_URG) below
1025          * would both like timely updates of the bits so that
1026          * we don't pass them by unnecessarily.  the rmb()
1027          * here ensures that we see them promptly -- the
1028          * corresponding wmb()'s are in ipath_poll_urgent()
1029          * and ipath_poll_next()...
1030          */
1031         rmb();
1032         portr = ((istat >> dd->ipath_i_rcvavail_shift) &
1033                  dd->ipath_i_rcvavail_mask) |
1034                 ((istat >> dd->ipath_i_rcvurg_shift) &
1035                  dd->ipath_i_rcvurg_mask);
1036         for (i = 1; i < dd->ipath_cfgports; i++) {
1037                 struct ipath_portdata *pd = dd->ipath_pd[i];
1038
1039                 if (portr & (1 << i) && pd && pd->port_cnt) {
1040                         if (test_and_clear_bit(IPATH_PORT_WAITING_RCV,
1041                                                &pd->port_flag)) {
1042                                 clear_bit(i + dd->ipath_r_intravail_shift,
1043                                           &dd->ipath_rcvctrl);
1044                                 wake_up_interruptible(&pd->port_wait);
1045                                 rcvdint = 1;
1046                         } else if (test_and_clear_bit(IPATH_PORT_WAITING_URG,
1047                                                       &pd->port_flag)) {
1048                                 pd->port_urgent++;
1049                                 wake_up_interruptible(&pd->port_wait);
1050                         }
1051                 }
1052         }
1053         if (rcvdint) {
1054                 /* only want to take one interrupt, so turn off the rcv
1055                  * interrupt for all the ports that we set the rcv_waiting
1056                  * (but never for kernel port)
1057                  */
1058                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
1059                                  dd->ipath_rcvctrl);
1060         }
1061 }
1062
1063 irqreturn_t ipath_intr(int irq, void *data)
1064 {
1065         struct ipath_devdata *dd = data;
1066         u64 istat, chk0rcv = 0;
1067         ipath_err_t estat = 0;
1068         irqreturn_t ret;
1069         static unsigned unexpected = 0;
1070         u64 kportrbits;
1071
1072         ipath_stats.sps_ints++;
1073
1074         if (dd->ipath_int_counter != (u32) -1)
1075                 dd->ipath_int_counter++;
1076
1077         if (!(dd->ipath_flags & IPATH_PRESENT)) {
1078                 /*
1079                  * This return value is not great, but we do not want the
1080                  * interrupt core code to remove our interrupt handler
1081                  * because we don't appear to be handling an interrupt
1082                  * during a chip reset.
1083                  */
1084                 return IRQ_HANDLED;
1085         }
1086
1087         /*
1088          * this needs to be flags&initted, not statusp, so we keep
1089          * taking interrupts even after link goes down, etc.
1090          * Also, we *must* clear the interrupt at some point, or we won't
1091          * take it again, which can be real bad for errors, etc...
1092          */
1093
1094         if (!(dd->ipath_flags & IPATH_INITTED)) {
1095                 ipath_bad_intr(dd, &unexpected);
1096                 ret = IRQ_NONE;
1097                 goto bail;
1098         }
1099
1100         istat = ipath_read_ireg(dd, dd->ipath_kregs->kr_intstatus);
1101
1102         if (unlikely(!istat)) {
1103                 ipath_stats.sps_nullintr++;
1104                 ret = IRQ_NONE; /* not our interrupt, or already handled */
1105                 goto bail;
1106         }
1107         if (unlikely(istat == -1)) {
1108                 ipath_bad_regread(dd);
1109                 /* don't know if it was our interrupt or not */
1110                 ret = IRQ_NONE;
1111                 goto bail;
1112         }
1113
1114         if (unexpected)
1115                 unexpected = 0;
1116
1117         if (unlikely(istat & ~dd->ipath_i_bitsextant))
1118                 ipath_dev_err(dd,
1119                               "interrupt with unknown interrupts %Lx set\n",
1120                               (unsigned long long)
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",
1124                         (unsigned long long) istat);
1125
1126         if (istat & INFINIPATH_I_ERROR) {
1127                 ipath_stats.sps_errints++;
1128                 estat = ipath_read_kreg64(dd,
1129                                           dd->ipath_kregs->kr_errorstatus);
1130                 if (!estat)
1131                         dev_info(&dd->pcidev->dev, "error interrupt (%Lx), "
1132                                  "but no error bits set!\n",
1133                                  (unsigned long long) istat);
1134                 else if (estat == -1LL)
1135                         /*
1136                          * should we try clearing all, or hope next read
1137                          * works?
1138                          */
1139                         ipath_dev_err(dd, "Read of error status failed "
1140                                       "(all bits set); ignoring\n");
1141                 else
1142                         chk0rcv |= handle_errors(dd, estat);
1143         }
1144
1145         if (istat & INFINIPATH_I_GPIO) {
1146                 /*
1147                  * GPIO interrupts fall in two broad classes:
1148                  * GPIO_2 indicates (on some HT4xx boards) that a packet
1149                  *        has arrived for Port 0. Checking for this
1150                  *        is controlled by flag IPATH_GPIO_INTR.
1151                  * GPIO_3..5 on IBA6120 Rev2 and IBA6110 Rev4 chips indicate
1152                  *        errors that we need to count. Checking for this
1153                  *        is controlled by flag IPATH_GPIO_ERRINTRS.
1154                  */
1155                 u32 gpiostatus;
1156                 u32 to_clear = 0;
1157
1158                 gpiostatus = ipath_read_kreg32(
1159                         dd, dd->ipath_kregs->kr_gpio_status);
1160                 /* First the error-counter case. */
1161                 if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) &&
1162                     (dd->ipath_flags & IPATH_GPIO_ERRINTRS)) {
1163                         /* want to clear the bits we see asserted. */
1164                         to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK);
1165
1166                         /*
1167                          * Count appropriately, clear bits out of our copy,
1168                          * as they have been "handled".
1169                          */
1170                         if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) {
1171                                 ipath_dbg("FlowCtl on UnsupVL\n");
1172                                 dd->ipath_rxfc_unsupvl_errs++;
1173                         }
1174                         if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) {
1175                                 ipath_dbg("Overrun Threshold exceeded\n");
1176                                 dd->ipath_overrun_thresh_errs++;
1177                         }
1178                         if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) {
1179                                 ipath_dbg("Local Link Integrity error\n");
1180                                 dd->ipath_lli_errs++;
1181                         }
1182                         gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK;
1183                 }
1184                 /* Now the Port0 Receive case */
1185                 if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) &&
1186                     (dd->ipath_flags & IPATH_GPIO_INTR)) {
1187                         /*
1188                          * GPIO status bit 2 is set, and we expected it.
1189                          * clear it and indicate in p0bits.
1190                          * This probably only happens if a Port0 pkt
1191                          * arrives at _just_ the wrong time, and we
1192                          * handle that by seting chk0rcv;
1193                          */
1194                         to_clear |= (1 << IPATH_GPIO_PORT0_BIT);
1195                         gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT);
1196                         chk0rcv = 1;
1197                 }
1198                 if (gpiostatus) {
1199                         /*
1200                          * Some unexpected bits remain. If they could have
1201                          * caused the interrupt, complain and clear.
1202                          * To avoid repetition of this condition, also clear
1203                          * the mask. It is almost certainly due to error.
1204                          */
1205                         const u32 mask = (u32) dd->ipath_gpio_mask;
1206
1207                         if (mask & gpiostatus) {
1208                                 ipath_dbg("Unexpected GPIO IRQ bits %x\n",
1209                                   gpiostatus & mask);
1210                                 to_clear |= (gpiostatus & mask);
1211                                 dd->ipath_gpio_mask &= ~(gpiostatus & mask);
1212                                 ipath_write_kreg(dd,
1213                                         dd->ipath_kregs->kr_gpio_mask,
1214                                         dd->ipath_gpio_mask);
1215                         }
1216                 }
1217                 if (to_clear) {
1218                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
1219                                         (u64) to_clear);
1220                 }
1221         }
1222
1223         /*
1224          * Clear the interrupt bits we found set, unless they are receive
1225          * related, in which case we already cleared them above, and don't
1226          * want to clear them again, because we might lose an interrupt.
1227          * Clear it early, so we "know" know the chip will have seen this by
1228          * the time we process the queue, and will re-interrupt if necessary.
1229          * The processor itself won't take the interrupt again until we return.
1230          */
1231         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
1232
1233         /*
1234          * Handle kernel receive queues before checking for pio buffers
1235          * available since receives can overflow; piobuf waiters can afford
1236          * a few extra cycles, since they were waiting anyway, and user's
1237          * waiting for receive are at the bottom.
1238          */
1239         kportrbits = (1ULL << dd->ipath_i_rcvavail_shift) |
1240                 (1ULL << dd->ipath_i_rcvurg_shift);
1241         if (chk0rcv || (istat & kportrbits)) {
1242                 istat &= ~kportrbits;
1243                 ipath_kreceive(dd->ipath_pd[0]);
1244         }
1245
1246         if (istat & ((dd->ipath_i_rcvavail_mask << dd->ipath_i_rcvavail_shift) |
1247                      (dd->ipath_i_rcvurg_mask << dd->ipath_i_rcvurg_shift)))
1248                 handle_urcv(dd, istat);
1249
1250         if (istat & (INFINIPATH_I_SDMAINT | INFINIPATH_I_SDMADISABLED))
1251                 handle_sdma_intr(dd, istat);
1252
1253         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
1254                 unsigned long flags;
1255
1256                 spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
1257                 dd->ipath_sendctrl &= ~INFINIPATH_S_PIOINTBUFAVAIL;
1258                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
1259                                  dd->ipath_sendctrl);
1260                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
1261                 spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
1262
1263                 /* always process; sdma verbs uses PIO for acks and VL15  */
1264                 handle_layer_pioavail(dd);
1265         }
1266
1267         ret = IRQ_HANDLED;
1268
1269 bail:
1270         return ret;
1271 }