1 files changed, 303 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_stats.c b/drivers/infiniband/hw/ipath/ipath_stats.c
new file mode 100644
index 000000000000..fe209137ee74
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_stats.c
@@ -0,0 +1,303 @@
+/*
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/pci.h>
+
+#include "ipath_kernel.h"
+
+struct infinipath_stats ipath_stats;
+
+/**
+ * ipath_snap_cntr - snapshot a chip counter
+ * @dd: the infinipath device
+ * @creg: the counter to snapshot
+ *
+ * called from add_timer and user counter read calls, to deal with
+ * counters that wrap in "human time".  The words sent and received, and
+ * the packets sent and received are all that we worry about.  For now,
+ * at least, we don't worry about error counters, because if they wrap
+ * that quickly, we probably don't care.  We may eventually just make this
+ * handle all the counters.  word counters can wrap in about 20 seconds
+ * of full bandwidth traffic, packet counters in a few hours.
+ */
+
+u64 ipath_snap_cntr(struct ipath_devdata *dd, ipath_creg creg)
+{
+        u32 val, reg64 = 0;
+        u64 val64;
+        unsigned long t0, t1;
+        u64 ret;
+
+        t0 = jiffies;
+        /* If fast increment counters are only 32 bits, snapshot them,
+         * and maintain them as 64bit values in the driver */
+        if (!(dd->ipath_flags & IPATH_32BITCOUNTERS) &&
+            (creg == dd->ipath_cregs->cr_wordsendcnt ||
+             creg == dd->ipath_cregs->cr_wordrcvcnt ||
+             creg == dd->ipath_cregs->cr_pktsendcnt ||
+             creg == dd->ipath_cregs->cr_pktrcvcnt)) {
+                val64 = ipath_read_creg(dd, creg);
+                val = val64 == ~0ULL ? ~0U : 0;
+                reg64 = 1;
+        } else                  /* val64 just to keep gcc quiet... */
+                val64 = val = ipath_read_creg32(dd, creg);
+        /*
+         * See if a second has passed.  This is just a way to detect things
+         * that are quite broken.  Normally this should take just a few
+         * cycles (the check is for long enough that we don't care if we get
+         * pre-empted.)  An Opteron HT O read timeout is 4 seconds with
+         * normal NB values
+         */
+        t1 = jiffies;
+        if (time_before(t0 + HZ, t1) && val == -1) {
+                ipath_dev_err(dd, "Error!  Read counter 0x%x timed out\n",
+                              creg);
+                ret = 0ULL;
+                goto bail;
+        }
+        if (reg64) {
+                ret = val64;
+                goto bail;
+        }
+
+        if (creg == dd->ipath_cregs->cr_wordsendcnt) {
+                if (val != dd->ipath_lastsword) {
+                        dd->ipath_sword += val - dd->ipath_lastsword;
+                        dd->ipath_lastsword = val;
+                }
+                val64 = dd->ipath_sword;
+        } else if (creg == dd->ipath_cregs->cr_wordrcvcnt) {
+                if (val != dd->ipath_lastrword) {
+                        dd->ipath_rword += val - dd->ipath_lastrword;
+                        dd->ipath_lastrword = val;
+                }
+                val64 = dd->ipath_rword;
+        } else if (creg == dd->ipath_cregs->cr_pktsendcnt) {
+                if (val != dd->ipath_lastspkts) {
+                        dd->ipath_spkts += val - dd->ipath_lastspkts;
+                        dd->ipath_lastspkts = val;
+                }
+                val64 = dd->ipath_spkts;
+        } else if (creg == dd->ipath_cregs->cr_pktrcvcnt) {
+                if (val != dd->ipath_lastrpkts) {
+                        dd->ipath_rpkts += val - dd->ipath_lastrpkts;
+                        dd->ipath_lastrpkts = val;
+                }
+                val64 = dd->ipath_rpkts;
+        } else
+                val64 = (u64) val;
+
+        ret = val64;
+
+bail:
+        return ret;
+}
+
+/**
+ * ipath_qcheck - print delta of egrfull/hdrqfull errors for kernel ports
+ * @dd: the infinipath device
+ *
+ * print the delta of egrfull/hdrqfull errors for kernel ports no more than
+ * every 5 seconds.  User processes are printed at close, but kernel doesn't
+ * close, so...  Separate routine so may call from other places someday, and
+ * so function name when printed by _IPATH_INFO is meaningfull
+ */
+static void ipath_qcheck(struct ipath_devdata *dd)
+{
+        static u64 last_tot_hdrqfull;
+        size_t blen = 0;
+        char buf[128];
+
+        *buf = 0;
+        if (dd->ipath_pd[0]->port_hdrqfull != dd->ipath_p0_hdrqfull) {
+                blen = snprintf(buf, sizeof buf, "port 0 hdrqfull %u",
+                                dd->ipath_pd[0]->port_hdrqfull -
+                                dd->ipath_p0_hdrqfull);
+                dd->ipath_p0_hdrqfull = dd->ipath_pd[0]->port_hdrqfull;
+        }
+        if (ipath_stats.sps_etidfull != dd->ipath_last_tidfull) {
+                blen += snprintf(buf + blen, sizeof buf - blen,
+                                 "%srcvegrfull %llu",
+                                 blen ? ", " : "",
+                                 (unsigned long long)
+                                 (ipath_stats.sps_etidfull -
+                                  dd->ipath_last_tidfull));
+                dd->ipath_last_tidfull = ipath_stats.sps_etidfull;
+        }
+
+        /*
+         * this is actually the number of hdrq full interrupts, not actual
+         * events, but at the moment that's mostly what I'm interested in.
+         * Actual count, etc. is in the counters, if needed.  For production
+         * users this won't ordinarily be printed.
+         */
+
+        if ((ipath_debug & (__IPATH_PKTDBG | __IPATH_DBG)) &&
+            ipath_stats.sps_hdrqfull != last_tot_hdrqfull) {
+                blen += snprintf(buf + blen, sizeof buf - blen,
+                                 "%shdrqfull %llu (all ports)",
+                                 blen ? ", " : "",
+                                 (unsigned long long)
+                                 (ipath_stats.sps_hdrqfull -
+                                  last_tot_hdrqfull));
+                last_tot_hdrqfull = ipath_stats.sps_hdrqfull;
+        }
+        if (blen)
+                ipath_dbg("%s\n", buf);
+
+        if (dd->ipath_port0head != (u32)
+            le64_to_cpu(*dd->ipath_hdrqtailptr)) {
+                if (dd->ipath_lastport0rcv_cnt ==
+                    ipath_stats.sps_port0pkts) {
+                        ipath_cdbg(PKT, "missing rcv interrupts? "
+                                   "port0 hd=%llx tl=%x; port0pkts %llx\n",
+                                   (unsigned long long)
+                                   le64_to_cpu(*dd->ipath_hdrqtailptr),
+                                   dd->ipath_port0head,
+                                   (unsigned long long)
+                                   ipath_stats.sps_port0pkts);
+                        ipath_kreceive(dd);
+                }
+                dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
+        }
+}
+
+/**
+ * ipath_get_faststats - get word counters from chip before they overflow
+ * @opaque - contains a pointer to the infinipath device ipath_devdata
+ *
+ * called from add_timer
+ */
+void ipath_get_faststats(unsigned long opaque)
+{
+        struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
+        u32 val;
+        static unsigned cnt;
+
+        /*
+         * don't access the chip while running diags, or memory diags can
+         * fail
+         */
+        if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT) ||
+            ipath_diag_inuse)
+                /* but re-arm the timer, for diags case; won't hurt other */
+                goto done;
+
+        if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
+                ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
+                ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
+                ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
+                ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
+        }
+
+        ipath_qcheck(dd);
+
+        /*
+         * deal with repeat error suppression.  Doesn't really matter if
+         * last error was almost a full interval ago, or just a few usecs
+         * ago; still won't get more than 2 per interval.  We may want
+         * longer intervals for this eventually, could do with mod, counter
+         * or separate timer.  Also see code in ipath_handle_errors() and
+         * ipath_handle_hwerrors().
+         */
+
+        if (dd->ipath_lasterror)
+                dd->ipath_lasterror = 0;
+        if (dd->ipath_lasthwerror)
+                dd->ipath_lasthwerror = 0;
+        if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs)
+            && time_after(jiffies, dd->ipath_unmasktime)) {
+                char ebuf[256];
+                ipath_decode_err(ebuf, sizeof ebuf,
+                                 (dd->ipath_maskederrs & ~dd->
+                                  ipath_ignorederrs));
+                if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
+                    ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
+                        ipath_dev_err(dd, "Re-enabling masked errors "
+                                      "(%s)\n", ebuf);
+                else {
+                        /*
+                         * rcvegrfull and rcvhdrqfull are "normal", for some
+                         * types of processes (mostly benchmarks) that send
+                         * huge numbers of messages, while not processing
+                         * them.  So only complain about these at debug
+                         * level.
+                         */
+                        ipath_dbg("Disabling frequent queue full errors "
+                                  "(%s)\n", ebuf);
+                }
+                dd->ipath_maskederrs = dd->ipath_ignorederrs;
+                ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
+                                 ~dd->ipath_maskederrs);
+        }
+
+        /* limit qfull messages to ~one per minute per port */
+        if ((++cnt & 0x10)) {
+                for (val = dd->ipath_cfgports - 1; ((int)val) >= 0;
+                     val--) {
+                        if (dd->ipath_lastegrheads[val] != -1)
+                                dd->ipath_lastegrheads[val] = -1;
+                        if (dd->ipath_lastrcvhdrqtails[val] != -1)
+                                dd->ipath_lastrcvhdrqtails[val] = -1;
+                }
+        }
+
+        if (dd->ipath_nosma_bufs) {
+                dd->ipath_nosma_secs += 5;
+                if (dd->ipath_nosma_secs >= 30) {
+                        ipath_cdbg(SMA, "No SMA bufs avail %u seconds; "
+                                   "cancelling pending sends\n",
+                                   dd->ipath_nosma_secs);
+                        /*
+                         * issue an abort as well, in case we have a packet
+                         * stuck in launch fifo.  This could corrupt an
+                         * outgoing user packet in the worst case,
+                         * but this is a pretty catastrophic, anyway.
+                         */
+                        ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+                                         INFINIPATH_S_ABORT);
+                        ipath_disarm_piobufs(dd, dd->ipath_lastport_piobuf,
+                                             dd->ipath_piobcnt2k +
+                                             dd->ipath_piobcnt4k -
+                                             dd->ipath_lastport_piobuf);
+                        /* start again, if necessary */
+                        dd->ipath_nosma_secs = 0;
+                } else
+                        ipath_cdbg(SMA, "No SMA bufs avail %u tries, "
+                                   "after %u seconds\n",
+                                   dd->ipath_nosma_bufs,
+                                   dd->ipath_nosma_secs);
+        }
+
+done:
+        mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
+}