drivers/infiniband/hw/ipath/ipath_stats.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. 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 "ipath_kernel.h"
  35
  36 struct infinipath_stats ipath_stats;
  37
  38 /**
  39  * ipath_snap_cntr - snapshot a chip counter
  40  * @dd: the infinipath device
  41  * @creg: the counter to snapshot
  42  *
  43  * called from add_timer and user counter read calls, to deal with
  44  * counters that wrap in "human time".  The words sent and received, and
  45  * the packets sent and received are all that we worry about.  For now,
  46  * at least, we don't worry about error counters, because if they wrap
  47  * that quickly, we probably don't care.  We may eventually just make this
  48  * handle all the counters.  word counters can wrap in about 20 seconds
  49  * of full bandwidth traffic, packet counters in a few hours.
  50  */
  51
  52 u64 ipath_snap_cntr(struct ipath_devdata *dd, ipath_creg creg)
  53 {
  54         u32 val, reg64 = 0;
  55         u64 val64;
  56         unsigned long t0, t1;
  57         u64 ret;
  58
  59         t0 = jiffies;
  60         /* If fast increment counters are only 32 bits, snapshot them,
  61          * and maintain them as 64bit values in the driver */
  62         if (!(dd->ipath_flags & IPATH_32BITCOUNTERS) &&
  63             (creg == dd->ipath_cregs->cr_wordsendcnt ||
  64              creg == dd->ipath_cregs->cr_wordrcvcnt ||
  65              creg == dd->ipath_cregs->cr_pktsendcnt ||
  66              creg == dd->ipath_cregs->cr_pktrcvcnt)) {
  67                 val64 = ipath_read_creg(dd, creg);
  68                 val = val64 == ~0ULL ? ~0U : 0;
  69                 reg64 = 1;
  70         } else                  /* val64 just to keep gcc quiet... */
  71                 val64 = val = ipath_read_creg32(dd, creg);
  72         /*
  73          * See if a second has passed.  This is just a way to detect things
  74          * that are quite broken.  Normally this should take just a few
  75          * cycles (the check is for long enough that we don't care if we get
  76          * pre-empted.)  An Opteron HT O read timeout is 4 seconds with
  77          * normal NB values
  78          */
  79         t1 = jiffies;
  80         if (time_before(t0 + HZ, t1) && val == -1) {
  81                 ipath_dev_err(dd, "Error!  Read counter 0x%x timed out\n",
  82                               creg);
  83                 ret = 0ULL;
  84                 goto bail;
  85         }
  86         if (reg64) {
  87                 ret = val64;
  88                 goto bail;
  89         }
  90
  91         if (creg == dd->ipath_cregs->cr_wordsendcnt) {
  92                 if (val != dd->ipath_lastsword) {
  93                         dd->ipath_sword += val - dd->ipath_lastsword;
  94                         dd->ipath_lastsword = val;
  95                 }
  96                 val64 = dd->ipath_sword;
  97         } else if (creg == dd->ipath_cregs->cr_wordrcvcnt) {
  98                 if (val != dd->ipath_lastrword) {
  99                         dd->ipath_rword += val - dd->ipath_lastrword;
 100                         dd->ipath_lastrword = val;
 101                 }
 102                 val64 = dd->ipath_rword;
 103         } else if (creg == dd->ipath_cregs->cr_pktsendcnt) {
 104                 if (val != dd->ipath_lastspkts) {
 105                         dd->ipath_spkts += val - dd->ipath_lastspkts;
 106                         dd->ipath_lastspkts = val;
 107                 }
 108                 val64 = dd->ipath_spkts;
 109         } else if (creg == dd->ipath_cregs->cr_pktrcvcnt) {
 110                 if (val != dd->ipath_lastrpkts) {
 111                         dd->ipath_rpkts += val - dd->ipath_lastrpkts;
 112                         dd->ipath_lastrpkts = val;
 113                 }
 114                 val64 = dd->ipath_rpkts;
 115         } else
 116                 val64 = (u64) val;
 117
 118         ret = val64;
 119
 120 bail:
 121         return ret;
 122 }
 123
 124 /**
 125  * ipath_qcheck - print delta of egrfull/hdrqfull errors for kernel ports
 126  * @dd: the infinipath device
 127  *
 128  * print the delta of egrfull/hdrqfull errors for kernel ports no more than
 129  * every 5 seconds.  User processes are printed at close, but kernel doesn't
 130  * close, so...  Separate routine so may call from other places someday, and
 131  * so function name when printed by _IPATH_INFO is meaningfull
 132  */
 133 static void ipath_qcheck(struct ipath_devdata *dd)
 134 {
 135         static u64 last_tot_hdrqfull;
 136         size_t blen = 0;
 137         char buf[128];
 138
 139         *buf = 0;
 140         if (dd->ipath_pd[0]->port_hdrqfull != dd->ipath_p0_hdrqfull) {
 141                 blen = snprintf(buf, sizeof buf, "port 0 hdrqfull %u",
 142                                 dd->ipath_pd[0]->port_hdrqfull -
 143                                 dd->ipath_p0_hdrqfull);
 144                 dd->ipath_p0_hdrqfull = dd->ipath_pd[0]->port_hdrqfull;
 145         }
 146         if (ipath_stats.sps_etidfull != dd->ipath_last_tidfull) {
 147                 blen += snprintf(buf + blen, sizeof buf - blen,
 148                                  "%srcvegrfull %llu",
 149                                  blen ? ", " : "",
 150                                  (unsigned long long)
 151                                  (ipath_stats.sps_etidfull -
 152                                   dd->ipath_last_tidfull));
 153                 dd->ipath_last_tidfull = ipath_stats.sps_etidfull;
 154         }
 155
 156         /*
 157          * this is actually the number of hdrq full interrupts, not actual
 158          * events, but at the moment that's mostly what I'm interested in.
 159          * Actual count, etc. is in the counters, if needed.  For production
 160          * users this won't ordinarily be printed.
 161          */
 162
 163         if ((ipath_debug & (__IPATH_PKTDBG | __IPATH_DBG)) &&
 164             ipath_stats.sps_hdrqfull != last_tot_hdrqfull) {
 165                 blen += snprintf(buf + blen, sizeof buf - blen,
 166                                  "%shdrqfull %llu (all ports)",
 167                                  blen ? ", " : "",
 168                                  (unsigned long long)
 169                                  (ipath_stats.sps_hdrqfull -
 170                                   last_tot_hdrqfull));
 171                 last_tot_hdrqfull = ipath_stats.sps_hdrqfull;
 172         }
 173         if (blen)
 174                 ipath_dbg("%s\n", buf);
 175
 176         if (dd->ipath_port0head != (u32)
 177             le64_to_cpu(*dd->ipath_hdrqtailptr)) {
 178                 if (dd->ipath_lastport0rcv_cnt ==
 179                     ipath_stats.sps_port0pkts) {
 180                         ipath_cdbg(PKT, "missing rcv interrupts? "
 181                                    "port0 hd=%llx tl=%x; port0pkts %llx\n",
 182                                    (unsigned long long)
 183                                    le64_to_cpu(*dd->ipath_hdrqtailptr),
 184                                    dd->ipath_port0head,
 185                                    (unsigned long long)
 186                                    ipath_stats.sps_port0pkts);
 187                 }
 188                 dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
 189         }
 190 }
 191
 192 /**
 193  * ipath_get_faststats - get word counters from chip before they overflow
 194  * @opaque - contains a pointer to the infinipath device ipath_devdata
 195  *
 196  * called from add_timer
 197  */
 198 void ipath_get_faststats(unsigned long opaque)
 199 {
 200         struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
 201         u32 val;
 202         static unsigned cnt;
 203
 204         /*
 205          * don't access the chip while running diags, or memory diags can
 206          * fail
 207          */
 208         if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_INITTED) ||
 209             ipath_diag_inuse)
 210                 /* but re-arm the timer, for diags case; won't hurt other */
 211                 goto done;
 212
 213         if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
 214                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
 215                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
 216                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 217                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
 218         }
 219
 220         ipath_qcheck(dd);
 221
 222         /*
 223          * deal with repeat error suppression.  Doesn't really matter if
 224          * last error was almost a full interval ago, or just a few usecs
 225          * ago; still won't get more than 2 per interval.  We may want
 226          * longer intervals for this eventually, could do with mod, counter
 227          * or separate timer.  Also see code in ipath_handle_errors() and
 228          * ipath_handle_hwerrors().
 229          */
 230
 231         if (dd->ipath_lasterror)
 232                 dd->ipath_lasterror = 0;
 233         if (dd->ipath_lasthwerror)
 234                 dd->ipath_lasthwerror = 0;
 235         if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs)
 236             && time_after(jiffies, dd->ipath_unmasktime)) {
 237                 char ebuf[256];
 238                 int iserr;
 239                 iserr = ipath_decode_err(ebuf, sizeof ebuf,
 240                                  (dd->ipath_maskederrs & ~dd->
 241                                   ipath_ignorederrs));
 242                 if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
 243                                 ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
 244                                 INFINIPATH_E_PKTERRS ))
 245                         ipath_dev_err(dd, "Re-enabling masked errors "
 246                                       "(%s)\n", ebuf);
 247                 else {
 248                         /*
 249                          * rcvegrfull and rcvhdrqfull are "normal", for some
 250                          * types of processes (mostly benchmarks) that send
 251                          * huge numbers of messages, while not processing
 252                          * them.  So only complain about these at debug
 253                          * level.
 254                          */
 255                         if (iserr)
 256                                         ipath_dbg("Re-enabling queue full errors (%s)\n",
 257                                                         ebuf);
 258                         else
 259                                 ipath_cdbg(ERRPKT, "Re-enabling packet"
 260                                                 " problem interrupt (%s)\n", ebuf);
 261                 }
 262                 dd->ipath_maskederrs = dd->ipath_ignorederrs;
 263                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 264                                  ~dd->ipath_maskederrs);
 265         }
 266
 267         /* limit qfull messages to ~one per minute per port */
 268         if ((++cnt & 0x10)) {
 269                 for (val = dd->ipath_cfgports - 1; ((int)val) >= 0;
 270                      val--) {
 271                         if (dd->ipath_lastegrheads[val] != -1)
 272                                 dd->ipath_lastegrheads[val] = -1;
 273                         if (dd->ipath_lastrcvhdrqtails[val] != -1)
 274                                 dd->ipath_lastrcvhdrqtails[val] = -1;
 275                 }
 276         }
 277
 278 done:
 279         mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
 280 }