/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * 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 "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);
                }
                dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
        }
}

static void ipath_chk_errormask(struct ipath_devdata *dd)
{
        static u32 fixed;
        u32 ctrl;
        unsigned long errormask;
        unsigned long hwerrs;

        if (!dd->ipath_errormask || !(dd->ipath_flags & IPATH_INITTED))
                return;

        errormask = ipath_read_kreg64(dd, dd->ipath_kregs->kr_errormask);

        if (errormask == dd->ipath_errormask)
                return;
        fixed++;

        hwerrs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_hwerrstatus);
        ctrl = ipath_read_kreg32(dd, dd->ipath_kregs->kr_control);

        ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
                dd->ipath_errormask);

        if ((hwerrs & dd->ipath_hwerrmask) ||
                (ctrl & INFINIPATH_C_FREEZEMODE)) {
                /* force re-interrupt of pending events, just in case */
                ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
                ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, 0ULL);
                ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
                dev_info(&dd->pcidev->dev,
                        "errormask fixed(%u) %lx -> %lx, ctrl %x hwerr %lx\n",
                        fixed, errormask, (unsigned long)dd->ipath_errormask,
                        ctrl, hwerrs);
        } else
                ipath_dbg("errormask fixed(%u) %lx -> %lx, no freeze\n",
                        fixed, errormask,
                        (unsigned long)dd->ipath_errormask);
}


/**
 * 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;
        unsigned long flags;
        u64 traffic_wds;

        /*
         * don't access the chip while running diags, or memory diags can
         * fail
         */
        if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_INITTED) ||
            ipath_diag_inuse)
                /* but re-arm the timer, for diags case; won't hurt other */
                goto done;

        /*
         * We now try to maintain a "active timer", based on traffic
         * exceeding a threshold, so we need to check the word-counts
         * even if they are 64-bit.
         */
        traffic_wds = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt) +
                ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
        spin_lock_irqsave(&dd->ipath_eep_st_lock, flags);
        traffic_wds -= dd->ipath_traffic_wds;
        dd->ipath_traffic_wds += traffic_wds;
        if (traffic_wds  >= IPATH_TRAFFIC_ACTIVE_THRESHOLD)
                atomic_add(5, &dd->ipath_active_time); /* S/B #define */
        spin_unlock_irqrestore(&dd->ipath_eep_st_lock, flags);

        if (dd->ipath_flags & IPATH_32BITCOUNTERS) {
                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
            && time_after(jiffies, dd->ipath_unmasktime)) {
                char ebuf[256];
                int iserr;
                iserr = ipath_decode_err(ebuf, sizeof ebuf,
                        dd->ipath_maskederrs);
                if (dd->ipath_maskederrs &
                                ~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
                                INFINIPATH_E_PKTERRS ))
                        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.
                         */
                        if (iserr)
                                        ipath_dbg("Re-enabling queue full errors (%s)\n",
                                                        ebuf);
                        else
                                ipath_cdbg(ERRPKT, "Re-enabling packet"
                                                " problem interrupt (%s)\n", ebuf);
                }

                /* re-enable masked errors */
                dd->ipath_errormask |= dd->ipath_maskederrs;
                ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
                        dd->ipath_errormask);
                dd->ipath_maskederrs = 0;
        }

        /* 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;
                }
        }

        ipath_chk_errormask(dd);
done:
        mod_timer(&dd->ipath_stats_timer, jiffies + HZ * 5);
}