typo fixes: occuring -> occurring
[linux-2.6.git] / drivers / infiniband / hw / ipath / ipath_intr.c
1 /*
2  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #include <linux/pci.h>
34
35 #include "ipath_kernel.h"
36 #include "ips_common.h"
37 #include "ipath_layer.h"
38
39 #define E_SUM_PKTERRS \
40         (INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
41          INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
42          INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
43          INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
44          INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
45          INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
46
47 #define E_SUM_ERRS \
48         (INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
49          INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
50          INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
51          INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
52          INFINIPATH_E_INVALIDADDR)
53
54 static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
55 {
56         unsigned long sbuf[4];
57         u64 ignore_this_time = 0;
58         u32 piobcnt;
59
60         /* if possible that sendbuffererror could be valid */
61         piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
62         /* read these before writing errorclear */
63         sbuf[0] = ipath_read_kreg64(
64                 dd, dd->ipath_kregs->kr_sendbuffererror);
65         sbuf[1] = ipath_read_kreg64(
66                 dd, dd->ipath_kregs->kr_sendbuffererror + 1);
67         if (piobcnt > 128) {
68                 sbuf[2] = ipath_read_kreg64(
69                         dd, dd->ipath_kregs->kr_sendbuffererror + 2);
70                 sbuf[3] = ipath_read_kreg64(
71                         dd, dd->ipath_kregs->kr_sendbuffererror + 3);
72         }
73
74         if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
75                 int i;
76
77                 ipath_cdbg(PKT, "SendbufErrs %lx %lx ", sbuf[0], sbuf[1]);
78                 if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
79                         printk("%lx %lx ", sbuf[2], sbuf[3]);
80                 for (i = 0; i < piobcnt; i++) {
81                         if (test_bit(i, sbuf)) {
82                                 u32 __iomem *piobuf;
83                                 if (i < dd->ipath_piobcnt2k)
84                                         piobuf = (u32 __iomem *)
85                                                 (dd->ipath_pio2kbase +
86                                                  i * dd->ipath_palign);
87                                 else
88                                         piobuf = (u32 __iomem *)
89                                                 (dd->ipath_pio4kbase +
90                                                  (i - dd->ipath_piobcnt2k) *
91                                                  dd->ipath_4kalign);
92
93                                 ipath_cdbg(PKT,
94                                            "PIObuf[%u] @%p pbc is %x; ",
95                                            i, piobuf, readl(piobuf));
96
97                                 ipath_disarm_piobufs(dd, i, 1);
98                         }
99                 }
100                 if (ipath_debug & __IPATH_PKTDBG)
101                         printk("\n");
102         }
103         if ((errs & (INFINIPATH_E_SDROPPEDDATAPKT |
104                      INFINIPATH_E_SDROPPEDSMPPKT |
105                      INFINIPATH_E_SMINPKTLEN)) &&
106             !(dd->ipath_flags & IPATH_LINKACTIVE)) {
107                 /*
108                  * This can happen when SMA is trying to bring the link
109                  * up, but the IB link changes state at the "wrong" time.
110                  * The IB logic then complains that the packet isn't
111                  * valid.  We don't want to confuse people, so we just
112                  * don't print them, except at debug
113                  */
114                 ipath_dbg("Ignoring pktsend errors %llx, because not "
115                           "yet active\n", (unsigned long long) errs);
116                 ignore_this_time = INFINIPATH_E_SDROPPEDDATAPKT |
117                         INFINIPATH_E_SDROPPEDSMPPKT |
118                         INFINIPATH_E_SMINPKTLEN;
119         }
120
121         return ignore_this_time;
122 }
123
124 /* return the strings for the most common link states */
125 static char *ib_linkstate(u32 linkstate)
126 {
127         char *ret;
128
129         switch (linkstate) {
130         case IPATH_IBSTATE_INIT:
131                 ret = "Init";
132                 break;
133         case IPATH_IBSTATE_ARM:
134                 ret = "Arm";
135                 break;
136         case IPATH_IBSTATE_ACTIVE:
137                 ret = "Active";
138                 break;
139         default:
140                 ret = "Down";
141         }
142
143         return ret;
144 }
145
146 static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
147                                      ipath_err_t errs, int noprint)
148 {
149         u64 val;
150         u32 ltstate, lstate;
151
152         /*
153          * even if diags are enabled, we want to notice LINKINIT, etc.
154          * We just don't want to change the LED state, or
155          * dd->ipath_kregs->kr_ibcctrl
156          */
157         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
158         lstate = val & IPATH_IBSTATE_MASK;
159         if (lstate == IPATH_IBSTATE_INIT || lstate == IPATH_IBSTATE_ARM ||
160             lstate == IPATH_IBSTATE_ACTIVE) {
161                 /*
162                  * only print at SMA if there is a change, debug if not
163                  * (sometimes we want to know that, usually not).
164                  */
165                 if (lstate == ((unsigned) dd->ipath_lastibcstat
166                                & IPATH_IBSTATE_MASK)) {
167                         ipath_dbg("Status change intr but no change (%s)\n",
168                                   ib_linkstate(lstate));
169                 }
170                 else
171                         ipath_cdbg(SMA, "Unit %u link state %s, last "
172                                    "was %s\n", dd->ipath_unit,
173                                    ib_linkstate(lstate),
174                                    ib_linkstate((unsigned)
175                                                 dd->ipath_lastibcstat
176                                                 & IPATH_IBSTATE_MASK));
177         }
178         else {
179                 lstate = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
180                 if (lstate == IPATH_IBSTATE_INIT ||
181                     lstate == IPATH_IBSTATE_ARM ||
182                     lstate == IPATH_IBSTATE_ACTIVE)
183                         ipath_cdbg(SMA, "Unit %u link state down"
184                                    " (state 0x%x), from %s\n",
185                                    dd->ipath_unit,
186                                    (u32)val & IPATH_IBSTATE_MASK,
187                                    ib_linkstate(lstate));
188                 else
189                         ipath_cdbg(VERBOSE, "Unit %u link state changed "
190                                    "to 0x%x from down (%x)\n",
191                                    dd->ipath_unit, (u32) val, lstate);
192         }
193         ltstate = (val >> INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT) &
194                 INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
195         lstate = (val >> INFINIPATH_IBCS_LINKSTATE_SHIFT) &
196                 INFINIPATH_IBCS_LINKSTATE_MASK;
197
198         if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
199             ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
200                 u32 last_ltstate;
201
202                 /*
203                  * Ignore cycling back and forth from Polling.Active
204                  * to Polling.Quiet while waiting for the other end of
205                  * the link to come up. We will cycle back and forth
206                  * between them if no cable is plugged in,
207                  * the other device is powered off or disabled, etc.
208                  */
209                 last_ltstate = (dd->ipath_lastibcstat >>
210                                 INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT)
211                         & INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
212                 if (last_ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE
213                     || last_ltstate ==
214                     INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
215                         if (dd->ipath_ibpollcnt > 40) {
216                                 dd->ipath_flags |= IPATH_NOCABLE;
217                                 *dd->ipath_statusp |=
218                                         IPATH_STATUS_IB_NOCABLE;
219                         } else
220                                 dd->ipath_ibpollcnt++;
221                         goto skip_ibchange;
222                 }
223         }
224         dd->ipath_ibpollcnt = 0;        /* some state other than 2 or 3 */
225         ipath_stats.sps_iblink++;
226         if (ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
227                 dd->ipath_flags |= IPATH_LINKDOWN;
228                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
229                                      | IPATH_LINKACTIVE |
230                                      IPATH_LINKARMED);
231                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
232                 if (!noprint) {
233                         if (((dd->ipath_lastibcstat >>
234                               INFINIPATH_IBCS_LINKSTATE_SHIFT) &
235                              INFINIPATH_IBCS_LINKSTATE_MASK)
236                             == INFINIPATH_IBCS_L_STATE_ACTIVE)
237                                 /* if from up to down be more vocal */
238                                 ipath_cdbg(SMA,
239                                            "Unit %u link now down (%s)\n",
240                                            dd->ipath_unit,
241                                            ipath_ibcstatus_str[ltstate]);
242                         else
243                                 ipath_cdbg(VERBOSE, "Unit %u link is "
244                                            "down (%s)\n", dd->ipath_unit,
245                                            ipath_ibcstatus_str[ltstate]);
246                 }
247
248                 dd->ipath_f_setextled(dd, lstate, ltstate);
249         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ACTIVE) {
250                 dd->ipath_flags |= IPATH_LINKACTIVE;
251                 dd->ipath_flags &=
252                         ~(IPATH_LINKUNK | IPATH_LINKINIT | IPATH_LINKDOWN |
253                           IPATH_LINKARMED | IPATH_NOCABLE);
254                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
255                 *dd->ipath_statusp |=
256                         IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
257                 dd->ipath_f_setextled(dd, lstate, ltstate);
258
259                 __ipath_layer_intr(dd, IPATH_LAYER_INT_IF_UP);
260         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_INIT) {
261                 /*
262                  * set INIT and DOWN.  Down is checked by most of the other
263                  * code, but INIT is useful to know in a few places.
264                  */
265                 dd->ipath_flags |= IPATH_LINKINIT | IPATH_LINKDOWN;
266                 dd->ipath_flags &=
267                         ~(IPATH_LINKUNK | IPATH_LINKACTIVE | IPATH_LINKARMED
268                           | IPATH_NOCABLE);
269                 *dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
270                                         | IPATH_STATUS_IB_READY);
271                 dd->ipath_f_setextled(dd, lstate, ltstate);
272         } else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ARM) {
273                 dd->ipath_flags |= IPATH_LINKARMED;
274                 dd->ipath_flags &=
275                         ~(IPATH_LINKUNK | IPATH_LINKDOWN | IPATH_LINKINIT |
276                           IPATH_LINKACTIVE | IPATH_NOCABLE);
277                 *dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
278                                         | IPATH_STATUS_IB_READY);
279                 dd->ipath_f_setextled(dd, lstate, ltstate);
280         } else {
281                 if (!noprint)
282                         ipath_dbg("IBstatuschange unit %u: %s (%x)\n",
283                                   dd->ipath_unit,
284                                   ipath_ibcstatus_str[ltstate], ltstate);
285         }
286 skip_ibchange:
287         dd->ipath_lastibcstat = val;
288 }
289
290 static void handle_supp_msgs(struct ipath_devdata *dd,
291                              unsigned supp_msgs, char msg[512])
292 {
293         /*
294          * Print the message unless it's ibc status change only, which
295          * happens so often we never want to count it.
296          */
297         if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
298                 ipath_decode_err(msg, sizeof msg, dd->ipath_lasterror &
299                                  ~INFINIPATH_E_IBSTATUSCHANGED);
300                 if (dd->ipath_lasterror &
301                     ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
302                         ipath_dev_err(dd, "Suppressed %u messages for "
303                                       "fast-repeating errors (%s) (%llx)\n",
304                                       supp_msgs, msg,
305                                       (unsigned long long)
306                                       dd->ipath_lasterror);
307                 else {
308                         /*
309                          * rcvegrfull and rcvhdrqfull are "normal", for some
310                          * types of processes (mostly benchmarks) that send
311                          * huge numbers of messages, while not processing
312                          * them. So only complain about these at debug
313                          * level.
314                          */
315                         ipath_dbg("Suppressed %u messages for %s\n",
316                                   supp_msgs, msg);
317                 }
318         }
319 }
320
321 static unsigned handle_frequent_errors(struct ipath_devdata *dd,
322                                        ipath_err_t errs, char msg[512],
323                                        int *noprint)
324 {
325         unsigned long nc;
326         static unsigned long nextmsg_time;
327         static unsigned nmsgs, supp_msgs;
328
329         /*
330          * Throttle back "fast" messages to no more than 10 per 5 seconds.
331          * This isn't perfect, but it's a reasonable heuristic. If we get
332          * more than 10, give a 6x longer delay.
333          */
334         nc = jiffies;
335         if (nmsgs > 10) {
336                 if (time_before(nc, nextmsg_time)) {
337                         *noprint = 1;
338                         if (!supp_msgs++)
339                                 nextmsg_time = nc + HZ * 3;
340                 }
341                 else if (supp_msgs) {
342                         handle_supp_msgs(dd, supp_msgs, msg);
343                         supp_msgs = 0;
344                         nmsgs = 0;
345                 }
346         }
347         else if (!nmsgs++ || time_after(nc, nextmsg_time))
348                 nextmsg_time = nc + HZ / 2;
349
350         return supp_msgs;
351 }
352
353 static void handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
354 {
355         char msg[512];
356         u64 ignore_this_time = 0;
357         int i;
358         int chkerrpkts = 0, noprint = 0;
359         unsigned supp_msgs;
360
361         supp_msgs = handle_frequent_errors(dd, errs, msg, &noprint);
362
363         /*
364          * don't report errors that are masked (includes those always
365          * ignored)
366          */
367         errs &= ~dd->ipath_maskederrs;
368
369         /* do these first, they are most important */
370         if (errs & INFINIPATH_E_HARDWARE) {
371                 /* reuse same msg buf */
372                 dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
373         }
374
375         if (!noprint && (errs & ~infinipath_e_bitsextant))
376                 ipath_dev_err(dd, "error interrupt with unknown errors "
377                               "%llx set\n", (unsigned long long)
378                               (errs & ~infinipath_e_bitsextant));
379
380         if (errs & E_SUM_ERRS)
381                 ignore_this_time = handle_e_sum_errs(dd, errs);
382
383         if (supp_msgs == 250000) {
384                 /*
385                  * It's not entirely reasonable assuming that the errors set
386                  * in the last clear period are all responsible for the
387                  * problem, but the alternative is to assume it's the only
388                  * ones on this particular interrupt, which also isn't great
389                  */
390                 dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
391                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
392                                  ~dd->ipath_maskederrs);
393                 ipath_decode_err(msg, sizeof msg,
394                                  (dd->ipath_maskederrs & ~dd->
395                                   ipath_ignorederrs));
396
397                 if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
398                     ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
399                         ipath_dev_err(dd, "Disabling error(s) %llx because "
400                                       "occurring too frequently (%s)\n",
401                                       (unsigned long long)
402                                       (dd->ipath_maskederrs &
403                                        ~dd->ipath_ignorederrs), msg);
404                 else {
405                         /*
406                          * rcvegrfull and rcvhdrqfull are "normal",
407                          * for some types of processes (mostly benchmarks)
408                          * that send huge numbers of messages, while not
409                          * processing them.  So only complain about
410                          * these at debug level.
411                          */
412                         ipath_dbg("Disabling frequent queue full errors "
413                                   "(%s)\n", msg);
414                 }
415
416                 /*
417                  * Re-enable the masked errors after around 3 minutes.  in
418                  * ipath_get_faststats().  If we have a series of fast
419                  * repeating but different errors, the interval will keep
420                  * stretching out, but that's OK, as that's pretty
421                  * catastrophic.
422                  */
423                 dd->ipath_unmasktime = jiffies + HZ * 180;
424         }
425
426         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
427         if (ignore_this_time)
428                 errs &= ~ignore_this_time;
429         if (errs & ~dd->ipath_lasterror) {
430                 errs &= ~dd->ipath_lasterror;
431                 /* never suppress duplicate hwerrors or ibstatuschange */
432                 dd->ipath_lasterror |= errs &
433                         ~(INFINIPATH_E_HARDWARE |
434                           INFINIPATH_E_IBSTATUSCHANGED);
435         }
436         if (!errs)
437                 return;
438
439         if (!noprint)
440                 /*
441                  * the ones we mask off are handled specially below or above
442                  */
443                 ipath_decode_err(msg, sizeof msg,
444                                  errs & ~(INFINIPATH_E_IBSTATUSCHANGED |
445                                           INFINIPATH_E_RRCVEGRFULL |
446                                           INFINIPATH_E_RRCVHDRFULL |
447                                           INFINIPATH_E_HARDWARE));
448         else
449                 /* so we don't need if (!noprint) at strlcat's below */
450                 *msg = 0;
451
452         if (errs & E_SUM_PKTERRS) {
453                 ipath_stats.sps_pkterrs++;
454                 chkerrpkts = 1;
455         }
456         if (errs & E_SUM_ERRS)
457                 ipath_stats.sps_errs++;
458
459         if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
460                 ipath_stats.sps_crcerrs++;
461                 chkerrpkts = 1;
462         }
463
464         /*
465          * We don't want to print these two as they happen, or we can make
466          * the situation even worse, because it takes so long to print
467          * messages to serial consoles.  Kernel ports get printed from
468          * fast_stats, no more than every 5 seconds, user ports get printed
469          * on close
470          */
471         if (errs & INFINIPATH_E_RRCVHDRFULL) {
472                 int any;
473                 u32 hd, tl;
474                 ipath_stats.sps_hdrqfull++;
475                 for (any = i = 0; i < dd->ipath_cfgports; i++) {
476                         struct ipath_portdata *pd = dd->ipath_pd[i];
477                         if (i == 0) {
478                                 hd = dd->ipath_port0head;
479                                 tl = (u32) le64_to_cpu(
480                                         *dd->ipath_hdrqtailptr);
481                         } else if (pd && pd->port_cnt &&
482                                    pd->port_rcvhdrtail_kvaddr) {
483                                 /*
484                                  * don't report same point multiple times,
485                                  * except kernel
486                                  */
487                                 tl = (u32) * pd->port_rcvhdrtail_kvaddr;
488                                 if (tl == dd->ipath_lastrcvhdrqtails[i])
489                                         continue;
490                                 hd = ipath_read_ureg32(dd, ur_rcvhdrhead,
491                                                        i);
492                         } else
493                                 continue;
494                         if (hd == (tl + 1) ||
495                             (!hd && tl == dd->ipath_hdrqlast)) {
496                                 dd->ipath_lastrcvhdrqtails[i] = tl;
497                                 pd->port_hdrqfull++;
498                                 if (i == 0)
499                                         chkerrpkts = 1;
500                         }
501                 }
502         }
503         if (errs & INFINIPATH_E_RRCVEGRFULL) {
504                 /*
505                  * since this is of less importance and not likely to
506                  * happen without also getting hdrfull, only count
507                  * occurrences; don't check each port (or even the kernel
508                  * vs user)
509                  */
510                 ipath_stats.sps_etidfull++;
511                 if (dd->ipath_port0head !=
512                     (u32) le64_to_cpu(*dd->ipath_hdrqtailptr))
513                         chkerrpkts = 1;
514         }
515
516         /*
517          * do this before IBSTATUSCHANGED, in case both bits set in a single
518          * interrupt; we want the STATUSCHANGE to "win", so we do our
519          * internal copy of state machine correctly
520          */
521         if (errs & INFINIPATH_E_RIBLOSTLINK) {
522                 /*
523                  * force through block below
524                  */
525                 errs |= INFINIPATH_E_IBSTATUSCHANGED;
526                 ipath_stats.sps_iblink++;
527                 dd->ipath_flags |= IPATH_LINKDOWN;
528                 dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
529                                      | IPATH_LINKARMED | IPATH_LINKACTIVE);
530                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
531                 if (!noprint) {
532                         u64 st = ipath_read_kreg64(
533                                 dd, dd->ipath_kregs->kr_ibcstatus);
534
535                         ipath_dbg("Lost link, link now down (%s)\n",
536                                   ipath_ibcstatus_str[st & 0xf]);
537                 }
538         }
539         if (errs & INFINIPATH_E_IBSTATUSCHANGED)
540                 handle_e_ibstatuschanged(dd, errs, noprint);
541
542         if (errs & INFINIPATH_E_RESET) {
543                 if (!noprint)
544                         ipath_dev_err(dd, "Got reset, requires re-init "
545                                       "(unload and reload driver)\n");
546                 dd->ipath_flags &= ~IPATH_INITTED;      /* needs re-init */
547                 /* mark as having had error */
548                 *dd->ipath_statusp |= IPATH_STATUS_HWERROR;
549                 *dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
550         }
551
552         if (!noprint && *msg)
553                 ipath_dev_err(dd, "%s error\n", msg);
554         if (dd->ipath_sma_state_wanted & dd->ipath_flags) {
555                 ipath_cdbg(VERBOSE, "sma wanted state %x, iflags now %x, "
556                            "waking\n", dd->ipath_sma_state_wanted,
557                            dd->ipath_flags);
558                 wake_up_interruptible(&ipath_sma_state_wait);
559         }
560
561         if (chkerrpkts)
562                 /* process possible error packets in hdrq */
563                 ipath_kreceive(dd);
564 }
565
566 /* this is separate to allow for better optimization of ipath_intr() */
567
568 static void ipath_bad_intr(struct ipath_devdata *dd, u32 * unexpectp)
569 {
570         /*
571          * sometimes happen during driver init and unload, don't want
572          * to process any interrupts at that point
573          */
574
575         /* this is just a bandaid, not a fix, if something goes badly
576          * wrong */
577         if (++*unexpectp > 100) {
578                 if (++*unexpectp > 105) {
579                         /*
580                          * ok, we must be taking somebody else's interrupts,
581                          * due to a messed up mptable and/or PIRQ table, so
582                          * unregister the interrupt.  We've seen this during
583                          * linuxbios development work, and it may happen in
584                          * the future again.
585                          */
586                         if (dd->pcidev && dd->pcidev->irq) {
587                                 ipath_dev_err(dd, "Now %u unexpected "
588                                               "interrupts, unregistering "
589                                               "interrupt handler\n",
590                                               *unexpectp);
591                                 ipath_dbg("free_irq of irq %x\n",
592                                           dd->pcidev->irq);
593                                 free_irq(dd->pcidev->irq, dd);
594                         }
595                 }
596                 if (ipath_read_kreg32(dd, dd->ipath_kregs->kr_intmask)) {
597                         ipath_dev_err(dd, "%u unexpected interrupts, "
598                                       "disabling interrupts completely\n",
599                                       *unexpectp);
600                         /*
601                          * disable all interrupts, something is very wrong
602                          */
603                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
604                                          0ULL);
605                 }
606         } else if (*unexpectp > 1)
607                 ipath_dbg("Interrupt when not ready, should not happen, "
608                           "ignoring\n");
609 }
610
611 static void ipath_bad_regread(struct ipath_devdata *dd)
612 {
613         static int allbits;
614
615         /* separate routine, for better optimization of ipath_intr() */
616
617         /*
618          * We print the message and disable interrupts, in hope of
619          * having a better chance of debugging the problem.
620          */
621         ipath_dev_err(dd,
622                       "Read of interrupt status failed (all bits set)\n");
623         if (allbits++) {
624                 /* disable all interrupts, something is very wrong */
625                 ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
626                 if (allbits == 2) {
627                         ipath_dev_err(dd, "Still bad interrupt status, "
628                                       "unregistering interrupt\n");
629                         free_irq(dd->pcidev->irq, dd);
630                 } else if (allbits > 2) {
631                         if ((allbits % 10000) == 0)
632                                 printk(".");
633                 } else
634                         ipath_dev_err(dd, "Disabling interrupts, "
635                                       "multiple errors\n");
636         }
637 }
638
639 static void handle_port_pioavail(struct ipath_devdata *dd)
640 {
641         u32 i;
642         /*
643          * start from port 1, since for now port 0  is never using
644          * wait_event for PIO
645          */
646         for (i = 1; dd->ipath_portpiowait && i < dd->ipath_cfgports; i++) {
647                 struct ipath_portdata *pd = dd->ipath_pd[i];
648
649                 if (pd && pd->port_cnt &&
650                     dd->ipath_portpiowait & (1U << i)) {
651                         clear_bit(i, &dd->ipath_portpiowait);
652                         if (test_bit(IPATH_PORT_WAITING_PIO,
653                                      &pd->port_flag)) {
654                                 clear_bit(IPATH_PORT_WAITING_PIO,
655                                           &pd->port_flag);
656                                 wake_up_interruptible(&pd->port_wait);
657                         }
658                 }
659         }
660 }
661
662 static void handle_layer_pioavail(struct ipath_devdata *dd)
663 {
664         int ret;
665
666         ret = __ipath_layer_intr(dd, IPATH_LAYER_INT_SEND_CONTINUE);
667         if (ret > 0)
668                 goto set;
669
670         ret = __ipath_verbs_piobufavail(dd);
671         if (ret > 0)
672                 goto set;
673
674         return;
675 set:
676         set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
677         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
678                          dd->ipath_sendctrl);
679 }
680
681 static void handle_rcv(struct ipath_devdata *dd, u32 istat)
682 {
683         u64 portr;
684         int i;
685         int rcvdint = 0;
686
687         portr = ((istat >> INFINIPATH_I_RCVAVAIL_SHIFT) &
688                  infinipath_i_rcvavail_mask)
689                 | ((istat >> INFINIPATH_I_RCVURG_SHIFT) &
690                    infinipath_i_rcvurg_mask);
691         for (i = 0; i < dd->ipath_cfgports; i++) {
692                 struct ipath_portdata *pd = dd->ipath_pd[i];
693                 if (portr & (1 << i) && pd &&
694                     pd->port_cnt) {
695                         if (i == 0)
696                                 ipath_kreceive(dd);
697                         else if (test_bit(IPATH_PORT_WAITING_RCV,
698                                           &pd->port_flag)) {
699                                 int rcbit;
700                                 clear_bit(IPATH_PORT_WAITING_RCV,
701                                           &pd->port_flag);
702                                 rcbit = i + INFINIPATH_R_INTRAVAIL_SHIFT;
703                                 clear_bit(1UL << rcbit, &dd->ipath_rcvctrl);
704                                 wake_up_interruptible(&pd->port_wait);
705                                 rcvdint = 1;
706                         }
707                 }
708         }
709         if (rcvdint) {
710                 /* only want to take one interrupt, so turn off the rcv
711                  * interrupt for all the ports that we did the wakeup on
712                  * (but never for kernel port)
713                  */
714                 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
715                                  dd->ipath_rcvctrl);
716         }
717 }
718
719 irqreturn_t ipath_intr(int irq, void *data, struct pt_regs *regs)
720 {
721         struct ipath_devdata *dd = data;
722         u32 istat;
723         ipath_err_t estat = 0;
724         static unsigned unexpected = 0;
725         irqreturn_t ret;
726
727         if(!(dd->ipath_flags & IPATH_PRESENT)) {
728                 /* this is mostly so we don't try to touch the chip while
729                  * it is being reset */
730                 /*
731                  * This return value is perhaps odd, but we do not want the
732                  * interrupt core code to remove our interrupt handler
733                  * because we don't appear to be handling an interrupt
734                  * during a chip reset.
735                  */
736                 return IRQ_HANDLED;
737         }
738
739         istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
740         if (unlikely(!istat)) {
741                 ipath_stats.sps_nullintr++;
742                 ret = IRQ_NONE; /* not our interrupt, or already handled */
743                 goto bail;
744         }
745         if (unlikely(istat == -1)) {
746                 ipath_bad_regread(dd);
747                 /* don't know if it was our interrupt or not */
748                 ret = IRQ_NONE;
749                 goto bail;
750         }
751
752         ipath_stats.sps_ints++;
753
754         /*
755          * this needs to be flags&initted, not statusp, so we keep
756          * taking interrupts even after link goes down, etc.
757          * Also, we *must* clear the interrupt at some point, or we won't
758          * take it again, which can be real bad for errors, etc...
759          */
760
761         if (!(dd->ipath_flags & IPATH_INITTED)) {
762                 ipath_bad_intr(dd, &unexpected);
763                 ret = IRQ_NONE;
764                 goto bail;
765         }
766         if (unexpected)
767                 unexpected = 0;
768
769         ipath_cdbg(VERBOSE, "intr stat=0x%x\n", istat);
770
771         if (istat & ~infinipath_i_bitsextant)
772                 ipath_dev_err(dd,
773                               "interrupt with unknown interrupts %x set\n",
774                               istat & (u32) ~ infinipath_i_bitsextant);
775
776         if (istat & INFINIPATH_I_ERROR) {
777                 ipath_stats.sps_errints++;
778                 estat = ipath_read_kreg64(dd,
779                                           dd->ipath_kregs->kr_errorstatus);
780                 if (!estat)
781                         dev_info(&dd->pcidev->dev, "error interrupt (%x), "
782                                  "but no error bits set!\n", istat);
783                 else if (estat == -1LL)
784                         /*
785                          * should we try clearing all, or hope next read
786                          * works?
787                          */
788                         ipath_dev_err(dd, "Read of error status failed "
789                                       "(all bits set); ignoring\n");
790                 else
791                         handle_errors(dd, estat);
792         }
793
794         if (istat & INFINIPATH_I_GPIO) {
795                 if (unlikely(!(dd->ipath_flags & IPATH_GPIO_INTR))) {
796                         u32 gpiostatus;
797                         gpiostatus = ipath_read_kreg32(
798                                 dd, dd->ipath_kregs->kr_gpio_status);
799                         ipath_dbg("Unexpected GPIO interrupt bits %x\n",
800                                   gpiostatus);
801                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
802                                          gpiostatus);
803                 }
804                 else {
805                         /* Clear GPIO status bit 2 */
806                         ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
807                                          (u64) (1 << 2));
808
809                         /*
810                          * Packets are available in the port 0 rcv queue.
811                          * Eventually this needs to be generalized to check
812                          * IPATH_GPIO_INTR, and the specific GPIO bit, if
813                          * GPIO interrupts are used for anything else.
814                          */
815                         ipath_kreceive(dd);
816                 }
817         }
818
819         /*
820          * clear the ones we will deal with on this round
821          * We clear it early, mostly for receive interrupts, so we
822          * know the chip will have seen this by the time we process
823          * the queue, and will re-interrupt if necessary.  The processor
824          * itself won't take the interrupt again until we return.
825          */
826         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
827
828         if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
829                 clear_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
830                 ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
831                                  dd->ipath_sendctrl);
832
833                 if (dd->ipath_portpiowait)
834                         handle_port_pioavail(dd);
835
836                 handle_layer_pioavail(dd);
837         }
838
839         /*
840          * we check for both transition from empty to non-empty, and urgent
841          * packets (those with the interrupt bit set in the header)
842          */
843
844         if (istat & ((infinipath_i_rcvavail_mask <<
845                       INFINIPATH_I_RCVAVAIL_SHIFT)
846                      | (infinipath_i_rcvurg_mask <<
847                         INFINIPATH_I_RCVURG_SHIFT)))
848                 handle_rcv(dd, istat);
849
850         ret = IRQ_HANDLED;
851
852 bail:
853         return ret;
854 }