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/*-
* Copyright (c) 2010-2011 Solarflare Communications, Inc.
* All rights reserved.
*
* This software was developed in part by Philip Paeps under contract for
* Solarflare Communications, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/condvar.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/taskqueue.h>
#include "common/efx.h"
#include "common/efx_mcdi.h"
#include "common/efx_regs_mcdi.h"
#include "sfxge.h"
#define SFXGE_MCDI_POLL_INTERVAL_MIN 10 /* 10us in 1us units */
#define SFXGE_MCDI_POLL_INTERVAL_MAX 100000 /* 100ms in 1us units */
#define SFXGE_MCDI_WATCHDOG_INTERVAL 10000000 /* 10s in 1us units */
/* Acquire exclusive access to MCDI for the duration of a request. */
static void
sfxge_mcdi_acquire(struct sfxge_mcdi *mcdi)
{
mtx_lock(&mcdi->lock);
KASSERT(mcdi->state != SFXGE_MCDI_UNINITIALIZED,
("MCDI not initialized"));
while (mcdi->state != SFXGE_MCDI_INITIALIZED)
(void)cv_wait_sig(&mcdi->cv, &mcdi->lock);
mcdi->state = SFXGE_MCDI_BUSY;
mtx_unlock(&mcdi->lock);
}
/* Release ownership of MCDI on request completion. */
static void
sfxge_mcdi_release(struct sfxge_mcdi *mcdi)
{
mtx_lock(&mcdi->lock);
KASSERT((mcdi->state == SFXGE_MCDI_BUSY ||
mcdi->state == SFXGE_MCDI_COMPLETED),
("MCDI not busy or task not completed"));
mcdi->state = SFXGE_MCDI_INITIALIZED;
cv_broadcast(&mcdi->cv);
mtx_unlock(&mcdi->lock);
}
static void
sfxge_mcdi_timeout(struct sfxge_softc *sc)
{
device_t dev = sc->dev;
log(LOG_WARNING, "[%s%d] MC_TIMEOUT", device_get_name(dev),
device_get_unit(dev));
EFSYS_PROBE(mcdi_timeout);
sfxge_schedule_reset(sc);
}
static void
sfxge_mcdi_poll(struct sfxge_softc *sc)
{
efx_nic_t *enp;
clock_t delay_total;
clock_t delay_us;
boolean_t aborted;
delay_total = 0;
delay_us = SFXGE_MCDI_POLL_INTERVAL_MIN;
enp = sc->enp;
do {
if (efx_mcdi_request_poll(enp)) {
EFSYS_PROBE1(mcdi_delay, clock_t, delay_total);
return;
}
if (delay_total > SFXGE_MCDI_WATCHDOG_INTERVAL) {
aborted = efx_mcdi_request_abort(enp);
KASSERT(aborted, ("abort failed"));
sfxge_mcdi_timeout(sc);
return;
}
/* Spin or block depending on delay interval. */
if (delay_us < 1000000)
DELAY(delay_us);
else
pause("mcdi wait", delay_us * hz / 1000000);
delay_total += delay_us;
/* Exponentially back off the poll frequency. */
delay_us = delay_us * 2;
if (delay_us > SFXGE_MCDI_POLL_INTERVAL_MAX)
delay_us = SFXGE_MCDI_POLL_INTERVAL_MAX;
} while (1);
}
static void
sfxge_mcdi_execute(void *arg, efx_mcdi_req_t *emrp)
{
struct sfxge_softc *sc;
struct sfxge_mcdi *mcdi;
sc = (struct sfxge_softc *)arg;
mcdi = &sc->mcdi;
sfxge_mcdi_acquire(mcdi);
/* Issue request and poll for completion. */
efx_mcdi_request_start(sc->enp, emrp, B_FALSE);
sfxge_mcdi_poll(sc);
sfxge_mcdi_release(mcdi);
}
static void
sfxge_mcdi_ev_cpl(void *arg)
{
struct sfxge_softc *sc;
struct sfxge_mcdi *mcdi;
sc = (struct sfxge_softc *)arg;
mcdi = &sc->mcdi;
mtx_lock(&mcdi->lock);
KASSERT(mcdi->state == SFXGE_MCDI_BUSY, ("MCDI not busy"));
mcdi->state = SFXGE_MCDI_COMPLETED;
cv_broadcast(&mcdi->cv);
mtx_unlock(&mcdi->lock);
}
static void
sfxge_mcdi_exception(void *arg, efx_mcdi_exception_t eme)
{
struct sfxge_softc *sc;
device_t dev;
sc = (struct sfxge_softc *)arg;
dev = sc->dev;
log(LOG_WARNING, "[%s%d] MC_%s", device_get_name(dev),
device_get_unit(dev),
(eme == EFX_MCDI_EXCEPTION_MC_REBOOT)
? "REBOOT"
: (eme == EFX_MCDI_EXCEPTION_MC_BADASSERT)
? "BADASSERT" : "UNKNOWN");
EFSYS_PROBE(mcdi_exception);
sfxge_schedule_reset(sc);
}
int
sfxge_mcdi_init(struct sfxge_softc *sc)
{
efx_nic_t *enp;
struct sfxge_mcdi *mcdi;
efx_mcdi_transport_t *emtp;
int rc;
enp = sc->enp;
mcdi = &sc->mcdi;
emtp = &mcdi->transport;
KASSERT(mcdi->state == SFXGE_MCDI_UNINITIALIZED,
("MCDI already initialized"));
mtx_init(&mcdi->lock, "sfxge_mcdi", NULL, MTX_DEF);
mcdi->state = SFXGE_MCDI_INITIALIZED;
emtp->emt_context = sc;
emtp->emt_execute = sfxge_mcdi_execute;
emtp->emt_ev_cpl = sfxge_mcdi_ev_cpl;
emtp->emt_exception = sfxge_mcdi_exception;
cv_init(&mcdi->cv, "sfxge_mcdi");
if ((rc = efx_mcdi_init(enp, emtp)) != 0)
goto fail;
return (0);
fail:
mtx_destroy(&mcdi->lock);
mcdi->state = SFXGE_MCDI_UNINITIALIZED;
return (rc);
}
void
sfxge_mcdi_fini(struct sfxge_softc *sc)
{
struct sfxge_mcdi *mcdi;
efx_nic_t *enp;
efx_mcdi_transport_t *emtp;
enp = sc->enp;
mcdi = &sc->mcdi;
emtp = &mcdi->transport;
mtx_lock(&mcdi->lock);
KASSERT(mcdi->state == SFXGE_MCDI_INITIALIZED,
("MCDI not initialized"));
efx_mcdi_fini(enp);
bzero(emtp, sizeof(*emtp));
cv_destroy(&mcdi->cv);
mtx_unlock(&mcdi->lock);
mtx_destroy(&mcdi->lock);
}
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