qib_intr.c

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/*
 * Copyright (c) 2006, 2007, 2008, 2009, 2010 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 <linux/pci.h>
#include <linux/delay.h>

#include "qib.h"
#include "qib_common.h"

static void qib_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
{
    strlcat(msg, "[", msgl);
    strlcat(msg, hwmsg, msgl);
    strlcat(msg, "]", msgl);
}

void qib_format_hwerrors(u64 hwerrs, const struct qib_hwerror_msgs *hwerrmsgs,
             size_t nhwerrmsgs, char *msg, size_t msgl)
{
    int i;

    for (i = 0; i < nhwerrmsgs; i++)
        if (hwerrs & hwerrmsgs[i].mask)
            qib_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
}

static void signal_ib_event(struct qib_pportdata *ppd, enum ib_event_type ev)
{
    struct ib_event event;
    struct qib_devdata *dd = ppd->dd;

    event.device = &dd->verbs_dev.ibdev;
    event.element.port_num = ppd->port;
    event.event = ev;
    ib_dispatch_event(&event);
}

void qib_handle_e_ibstatuschanged(struct qib_pportdata *ppd, u64 ibcs)
{
    struct qib_devdata *dd = ppd->dd;
    unsigned long flags;
    u32 lstate;
    u8 ltstate;
    enum ib_event_type ev = 0;

    lstate = dd->f_iblink_state(ibcs); /* linkstate */
    ltstate = dd->f_ibphys_portstate(ibcs);

    /*
     * If linkstate transitions into INIT from any of the various down
     * states, or if it transitions from any of the up (INIT or better)
     * states into any of the down states (except link recovery), then
     * call the chip-specific code to take appropriate actions.
     *
     * ppd->lflags could be 0 if this is the first time the interrupt
     * handlers has been called but the link is already up.
     */
    if (lstate >= IB_PORT_INIT &&
        (!ppd->lflags || (ppd->lflags & QIBL_LINKDOWN)) &&
        ltstate == IB_PHYSPORTSTATE_LINKUP) {
        /* transitioned to UP */
        if (dd->f_ib_updown(ppd, 1, ibcs))
            goto skip_ibchange; /* chip-code handled */
    } else if (ppd->lflags & (QIBL_LINKINIT | QIBL_LINKARMED |
           QIBL_LINKACTIVE | QIBL_IB_FORCE_NOTIFY)) {
        if (ltstate != IB_PHYSPORTSTATE_LINKUP &&
            ltstate <= IB_PHYSPORTSTATE_CFG_TRAIN &&
            dd->f_ib_updown(ppd, 0, ibcs))
            goto skip_ibchange; /* chip-code handled */
        qib_set_uevent_bits(ppd, _QIB_EVENT_LINKDOWN_BIT);
    }

    if (lstate != IB_PORT_DOWN) {
        /* lstate is INIT, ARMED, or ACTIVE */
        if (lstate != IB_PORT_ACTIVE) {
            *ppd->statusp &= ~QIB_STATUS_IB_READY;
            if (ppd->lflags & QIBL_LINKACTIVE)
                ev = IB_EVENT_PORT_ERR;
            spin_lock_irqsave(&ppd->lflags_lock, flags);
            if (lstate == IB_PORT_ARMED) {
                ppd->lflags |= QIBL_LINKARMED | QIBL_LINKV;
                ppd->lflags &= ~(QIBL_LINKINIT |
                    QIBL_LINKDOWN | QIBL_LINKACTIVE);
            } else {
                ppd->lflags |= QIBL_LINKINIT | QIBL_LINKV;
                ppd->lflags &= ~(QIBL_LINKARMED |
                    QIBL_LINKDOWN | QIBL_LINKACTIVE);
            }
            spin_unlock_irqrestore(&ppd->lflags_lock, flags);
            /* start a 75msec timer to clear symbol errors */
            mod_timer(&ppd->symerr_clear_timer,
                  msecs_to_jiffies(75));
        } else if (ltstate == IB_PHYSPORTSTATE_LINKUP &&
               !(ppd->lflags & QIBL_LINKACTIVE)) {
            /* active, but not active defered */
            qib_hol_up(ppd); /* useful only for 6120 now */
            *ppd->statusp |=
                QIB_STATUS_IB_READY | QIB_STATUS_IB_CONF;
            qib_clear_symerror_on_linkup((unsigned long)ppd);
            spin_lock_irqsave(&ppd->lflags_lock, flags);
            ppd->lflags |= QIBL_LINKACTIVE | QIBL_LINKV;
            ppd->lflags &= ~(QIBL_LINKINIT |
                QIBL_LINKDOWN | QIBL_LINKARMED);
            spin_unlock_irqrestore(&ppd->lflags_lock, flags);
            if (dd->flags & QIB_HAS_SEND_DMA)
                qib_sdma_process_event(ppd,
                    qib_sdma_event_e30_go_running);
            ev = IB_EVENT_PORT_ACTIVE;
            dd->f_setextled(ppd, 1);
        }
    } else { /* down */
        if (ppd->lflags & QIBL_LINKACTIVE)
            ev = IB_EVENT_PORT_ERR;
        spin_lock_irqsave(&ppd->lflags_lock, flags);
        ppd->lflags |= QIBL_LINKDOWN | QIBL_LINKV;
        ppd->lflags &= ~(QIBL_LINKINIT |
                 QIBL_LINKACTIVE | QIBL_LINKARMED);
        spin_unlock_irqrestore(&ppd->lflags_lock, flags);
        *ppd->statusp &= ~QIB_STATUS_IB_READY;
    }

skip_ibchange:
    ppd->lastibcstat = ibcs;
    if (ev)
        signal_ib_event(ppd, ev);
    return;
}

void qib_clear_symerror_on_linkup(unsigned long opaque)
{
    struct qib_pportdata *ppd = (struct qib_pportdata *)opaque;

    if (ppd->lflags & QIBL_LINKACTIVE)
        return;

    ppd->ibport_data.z_symbol_error_counter =
        ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBSYMBOLERR);
}

/*
 * Handle receive interrupts for user ctxts; this means a user
 * process was waiting for a packet to arrive, and didn't want
 * to poll.
 */
void qib_handle_urcv(struct qib_devdata *dd, u64 ctxtr)
{
    struct qib_ctxtdata *rcd;
    unsigned long flags;
    int i;

    spin_lock_irqsave(&dd->uctxt_lock, flags);
    for (i = dd->first_user_ctxt; dd->rcd && i < dd->cfgctxts; i++) {
        if (!(ctxtr & (1ULL << i)))
            continue;
        rcd = dd->rcd[i];
        if (!rcd || !rcd->cnt)
            continue;

        if (test_and_clear_bit(QIB_CTXT_WAITING_RCV, &rcd->flag)) {
            wake_up_interruptible(&rcd->wait);
            dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_DIS,
                      rcd->ctxt);
        } else if (test_and_clear_bit(QIB_CTXT_WAITING_URG,
                          &rcd->flag)) {
            rcd->urgent++;
            wake_up_interruptible(&rcd->wait);
        }
    }
    spin_unlock_irqrestore(&dd->uctxt_lock, flags);
}

void qib_bad_intrstatus(struct qib_devdata *dd)
{
    static int allbits;

    /* separate routine, for better optimization of qib_intr() */

    /*
     * We print the message and disable interrupts, in hope of
     * having a better chance of debugging the problem.
     */
    qib_dev_err(dd,
        "Read of chip interrupt status failed disabling interrupts\n");
    if (allbits++) {
        /* disable interrupt delivery, something is very wrong */
        if (allbits == 2)
            dd->f_set_intr_state(dd, 0);
        if (allbits == 3) {
            qib_dev_err(dd,
                "2nd bad interrupt status, unregistering interrupts\n");
            dd->flags |= QIB_BADINTR;
            dd->flags &= ~QIB_INITTED;
            dd->f_free_irq(dd);
        }
    }
}