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/*-
* Copyright (c) 2015 Microsoft Corp.
* All rights reserved.
*
* 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/proc.h>
#include <sys/systm.h>
#include <sys/smp.h>
#include <sys/time.h>
#include <sys/timeet.h>
#include "hv_vmbus_priv.h"
#define HV_TIMER_FREQUENCY (10 * 1000 * 1000LL) /* 100ns period */
#define HV_MAX_DELTA_TICKS 0xffffffffLL
#define HV_MIN_DELTA_TICKS 1LL
static struct eventtimer et;
static uint64_t periodticks[MAXCPU];
static inline uint64_t
sbintime2tick(sbintime_t time)
{
struct timespec val;
val = sbttots(time);
return val.tv_sec * HV_TIMER_FREQUENCY + val.tv_nsec / 100;
}
static int
hv_et_start(struct eventtimer *et, sbintime_t firsttime, sbintime_t periodtime)
{
union hv_timer_config timer_cfg;
uint64_t current;
timer_cfg.as_uint64 = 0;
timer_cfg.auto_enable = 1;
timer_cfg.sintx = HV_VMBUS_MESSAGE_SINT;
periodticks[curcpu] = sbintime2tick(periodtime);
if (firsttime == 0)
firsttime = periodtime;
current = rdmsr(HV_X64_MSR_TIME_REF_COUNT);
current += sbintime2tick(firsttime);
wrmsr(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
wrmsr(HV_X64_MSR_STIMER0_COUNT, current);
return (0);
}
static int
hv_et_stop(struct eventtimer *et)
{
wrmsr(HV_X64_MSR_STIMER0_CONFIG, 0);
wrmsr(HV_X64_MSR_STIMER0_COUNT, 0);
return (0);
}
void
hv_et_intr(struct trapframe *frame)
{
union hv_timer_config timer_cfg;
struct trapframe *oldframe;
struct thread *td;
if (periodticks[curcpu] != 0) {
uint64_t tick = sbintime2tick(periodticks[curcpu]);
timer_cfg.as_uint64 = rdmsr(HV_X64_MSR_STIMER0_CONFIG);
timer_cfg.enable = 0;
timer_cfg.auto_enable = 1;
timer_cfg.periodic = 1;
periodticks[curcpu] = 0;
wrmsr(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
wrmsr(HV_X64_MSR_STIMER0_COUNT, tick);
}
if (et.et_active) {
td = curthread;
td->td_intr_nesting_level++;
oldframe = td->td_intr_frame;
td->td_intr_frame = frame;
et.et_event_cb(&et, et.et_arg);
td->td_intr_frame = oldframe;
td->td_intr_nesting_level--;
}
}
void
hv_et_init(void)
{
et.et_name = "HyperV";
et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERCPU | ET_FLAGS_PERIODIC;
et.et_quality = 1000;
et.et_frequency = HV_TIMER_FREQUENCY;
et.et_min_period = (1LL << 32) / HV_TIMER_FREQUENCY;
et.et_max_period = HV_MAX_DELTA_TICKS * ((1LL << 32) / HV_TIMER_FREQUENCY);
et.et_start = hv_et_start;
et.et_stop = hv_et_stop;
et.et_priv = &et;
et_register(&et);
}
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