git.oblomov.eu Git - linux-2.6/blob - 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 <linux/pci.h>
  35
  36 #include "ipath_kernel.h"
  37
  38 struct infinipath_stats ipath_stats;
  39
  40 /**
  41  * ipath_snap_cntr - snapshot a chip counter
  42  * @dd: the infinipath device
  43  * @creg: the counter to snapshot
  44  *
  45  * called from add_timer and user counter read calls, to deal with
  46  * counters that wrap in "human time".  The words sent and received, and
  47  * the packets sent and received are all that we worry about.  For now,
  48  * at least, we don't worry about error counters, because if they wrap
  49  * that quickly, we probably don't care.  We may eventually just make this
  50  * handle all the counters.  word counters can wrap in about 20 seconds
  51  * of full bandwidth traffic, packet counters in a few hours.
  52  */
  53
  54 u64 ipath_snap_cntr(struct ipath_devdata *dd, ipath_creg creg)
  55 {
  56         u32 val, reg64 = 0;
  57         u64 val64;
  58         unsigned long t0, t1;
  59         u64 ret;
  60
  61         t0 = jiffies;
  62         /* If fast increment counters are only 32 bits, snapshot them,
  63          * and maintain them as 64bit values in the driver */
  64         if (!(dd->ipath_flags & IPATH_32BITCOUNTERS) &&
  65             (creg == dd->ipath_cregs->cr_wordsendcnt ||
  66              creg == dd->ipath_cregs->cr_wordrcvcnt ||
  67              creg == dd->ipath_cregs->cr_pktsendcnt ||
  68              creg == dd->ipath_cregs->cr_pktrcvcnt)) {
  69                 val64 = ipath_read_creg(dd, creg);
  70                 val = val64 == ~0ULL ? ~0U : 0;
  71                 reg64 = 1;
  72         } else                  /* val64 just to keep gcc quiet... */
  73                 val64 = val = ipath_read_creg32(dd, creg);
  74         /*
  75          * See if a second has passed.  This is just a way to detect things
  76          * that are quite broken.  Normally this should take just a few
  77          * cycles (the check is for long enough that we don't care if we get
  78          * pre-empted.)  An Opteron HT O read timeout is 4 seconds with
  79          * normal NB values
  80          */
  81         t1 = jiffies;
  82         if (time_before(t0 + HZ, t1) && val == -1) {
  83                 ipath_dev_err(dd, "Error!  Read counter 0x%x timed out\n",
  84                               creg);
  85                 ret = 0ULL;
  86                 goto bail;
  87         }
  88         if (reg64) {
  89                 ret = val64;
  90                 goto bail;
  91         }
  92
  93         if (creg == dd->ipath_cregs->cr_wordsendcnt) {
  94                 if (val != dd->ipath_lastsword) {
  95                         dd->ipath_sword += val - dd->ipath_lastsword;
  96                         dd->ipath_lastsword = val;
  97                 }
  98                 val64 = dd->ipath_sword;
  99         } else if (creg == dd->ipath_cregs->cr_wordrcvcnt) {
 100                 if (val != dd->ipath_lastrword) {
 101                         dd->ipath_rword += val - dd->ipath_lastrword;
 102                         dd->ipath_lastrword = val;
 103                 }
 104                 val64 = dd->ipath_rword;
 105         } else if (creg == dd->ipath_cregs->cr_pktsendcnt) {
 106                 if (val != dd->ipath_lastspkts) {
 107                         dd->ipath_spkts += val - dd->ipath_lastspkts;
 108                         dd->ipath_lastspkts = val;
 109                 }
 110                 val64 = dd->ipath_spkts;
 111         } else if (creg == dd->ipath_cregs->cr_pktrcvcnt) {
 112                 if (val != dd->ipath_lastrpkts) {
 113                         dd->ipath_rpkts += val - dd->ipath_lastrpkts;
 114                         dd->ipath_lastrpkts = val;
 115                 }
 116                 val64 = dd->ipath_rpkts;
 117         } else
 118                 val64 = (u64) val;
 119
 120         ret = val64;
 121
 122 bail:
 123         return ret;
 124 }
 125
 126 /**
 127  * ipath_qcheck - print delta of egrfull/hdrqfull errors for kernel ports
 128  * @dd: the infinipath device
 129  *
 130  * print the delta of egrfull/hdrqfull errors for kernel ports no more than
 131  * every 5 seconds.  User processes are printed at close, but kernel doesn't
 132  * close, so...  Separate routine so may call from other places someday, and
 133  * so function name when printed by _IPATH_INFO is meaningfull
 134  */
 135 static void ipath_qcheck(struct ipath_devdata *dd)
 136 {
 137         static u64 last_tot_hdrqfull;
 138         size_t blen = 0;
 139         char buf[128];
 140
 141         *buf = 0;
 142         if (dd->ipath_pd[0]->port_hdrqfull != dd->ipath_p0_hdrqfull) {
 143                 blen = snprintf(buf, sizeof buf, "port 0 hdrqfull %u",
 144                                 dd->ipath_pd[0]->port_hdrqfull -
 145                                 dd->ipath_p0_hdrqfull);
 146                 dd->ipath_p0_hdrqfull = dd->ipath_pd[0]->port_hdrqfull;
 147         }
 148         if (ipath_stats.sps_etidfull != dd->ipath_last_tidfull) {
 149                 blen += snprintf(buf + blen, sizeof buf - blen,
 150                                  "%srcvegrfull %llu",
 151                                  blen ? ", " : "",
 152                                  (unsigned long long)
 153                                  (ipath_stats.sps_etidfull -
 154                                   dd->ipath_last_tidfull));
 155                 dd->ipath_last_tidfull = ipath_stats.sps_etidfull;
 156         }
 157
 158         /*
 159          * this is actually the number of hdrq full interrupts, not actual
 160          * events, but at the moment that's mostly what I'm interested in.
 161          * Actual count, etc. is in the counters, if needed.  For production
 162          * users this won't ordinarily be printed.
 163          */
 164
 165         if ((ipath_debug & (__IPATH_PKTDBG | __IPATH_DBG)) &&
 166             ipath_stats.sps_hdrqfull != last_tot_hdrqfull) {
 167                 blen += snprintf(buf + blen, sizeof buf - blen,
 168                                  "%shdrqfull %llu (all ports)",
 169                                  blen ? ", " : "",
 170                                  (unsigned long long)
 171                                  (ipath_stats.sps_hdrqfull -
 172                                   last_tot_hdrqfull));
 173                 last_tot_hdrqfull = ipath_stats.sps_hdrqfull;
 174         }
 175         if (blen)
 176                 ipath_dbg("%s\n", buf);
 177
 178         if (dd->ipath_port0head != (u32)
 179             le64_to_cpu(*dd->ipath_hdrqtailptr)) {
 180                 if (dd->ipath_lastport0rcv_cnt ==
 181                     ipath_stats.sps_port0pkts) {
 182                         ipath_cdbg(PKT, "missing rcv interrupts? "
 183                                    "port0 hd=%llx tl=%x; port0pkts %llx\n",
 184                                    (unsigned long long)
 185                                    le64_to_cpu(*dd->ipath_hdrqtailptr),
 186                                    dd->ipath_port0head,
 187                                    (unsigned long long)
 188                                    ipath_stats.sps_port0pkts);
 189                 }
 190                 dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
 191         }
 192 }
 193
 194 /**
 195  * ipath_get_faststats - get word counters from chip before they overflow
 196  * @opaque - contains a pointer to the infinipath device ipath_devdata
 197  *
 198  * called from add_timer
 199  */
 200 void ipath_get_faststats(unsigned long opaque)
 201 {
 202         struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
 203         u32 val;
 204         static unsigned cnt;
 205
 206         /*
 207          * don't access the chip while running diags, or memory diags can
 208          * fail
 209          */
 210         if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT) ||
 211             ipath_diag_inuse)
 212                 /* but re-arm the timer, for diags case; won't hurt other */
 213                 goto done;
 214
 215         if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
 216                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
 217                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
 218                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 219                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
 220         }
 221
 222         ipath_qcheck(dd);
 223
 224         /*
 225          * deal with repeat error suppression.  Doesn't really matter if
 226          * last error was almost a full interval ago, or just a few usecs
 227          * ago; still won't get more than 2 per interval.  We may want
 228          * longer intervals for this eventually, could do with mod, counter
 229          * or separate timer.  Also see code in ipath_handle_errors() and
 230          * ipath_handle_hwerrors().
 231          */
 232
 233         if (dd->ipath_lasterror)
 234                 dd->ipath_lasterror = 0;
 235         if (dd->ipath_lasthwerror)
 236                 dd->ipath_lasthwerror = 0;
 237         if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs)
 238             && time_after(jiffies, dd->ipath_unmasktime)) {
 239                 char ebuf[256];
 240                 ipath_decode_err(ebuf, sizeof ebuf,
 241                                  (dd->ipath_maskederrs & ~dd->
 242                                   ipath_ignorederrs));
 243                 if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
 244                     ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
 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                         ipath_dbg("Disabling frequent queue full errors "
 256                                   "(%s)\n", ebuf);
 257                 }
 258                 dd->ipath_maskederrs = dd->ipath_ignorederrs;
 259                 ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 260                                  ~dd->ipath_maskederrs);
 261         }
 262
 263         /* limit qfull messages to ~one per minute per port */
 264         if ((++cnt & 0x10)) {
 265                 for (val = dd->ipath_cfgports - 1; ((int)val) >= 0;
 266                      val--) {
 267                         if (dd->ipath_lastegrheads[val] != -1)
 268                                 dd->ipath_lastegrheads[val] = -1;
 269                         if (dd->ipath_lastrcvhdrqtails[val] != -1)
 270                                 dd->ipath_lastrcvhdrqtails[val] = -1;
 271                 }
 272         }
 273
 274 done:
 275         mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
 276 }