Changeset View
Changeset View
Standalone View
Standalone View
head/sys/dev/hyperv/vmbus/hv_et.c
Property | Old Value | New Value |
---|---|---|
svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* 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); | |||||
} | |||||