vmbus_et.c revision 298449
1293873Ssephe/*- 2298446Ssephe * Copyright (c) 2015,2016 Microsoft Corp. 3293873Ssephe * All rights reserved. 4293873Ssephe * 5293873Ssephe * Redistribution and use in source and binary forms, with or without 6293873Ssephe * modification, are permitted provided that the following conditions 7293873Ssephe * are met: 8293873Ssephe * 1. Redistributions of source code must retain the above copyright 9293873Ssephe * notice, this list of conditions and the following disclaimer. 10293873Ssephe * 2. Redistributions in binary form must reproduce the above copyright 11293873Ssephe * notice, this list of conditions and the following disclaimer in the 12293873Ssephe * documentation and/or other materials provided with the distribution. 13293873Ssephe * 14293873Ssephe * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15293873Ssephe * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16293873Ssephe * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17293873Ssephe * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18293873Ssephe * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19293873Ssephe * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20293873Ssephe * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21293873Ssephe * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22293873Ssephe * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23293873Ssephe * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24293873Ssephe * SUCH DAMAGE. 25293873Ssephe */ 26293873Ssephe 27293873Ssephe#include <sys/cdefs.h> 28293873Ssephe__FBSDID("$FreeBSD: head/sys/dev/hyperv/vmbus/hv_et.c 298449 2016-04-22 05:15:59Z sephe $"); 29293873Ssephe 30293873Ssephe#include <sys/param.h> 31298449Ssephe#include <sys/bus.h> 32298449Ssephe#include <sys/kernel.h> 33298449Ssephe#include <sys/module.h> 34293873Ssephe#include <sys/proc.h> 35293873Ssephe#include <sys/systm.h> 36293873Ssephe#include <sys/smp.h> 37293873Ssephe#include <sys/time.h> 38293873Ssephe#include <sys/timeet.h> 39293873Ssephe 40293873Ssephe#include "hv_vmbus_priv.h" 41293873Ssephe 42293873Ssephe#define HV_TIMER_FREQUENCY (10 * 1000 * 1000LL) /* 100ns period */ 43293873Ssephe#define HV_MAX_DELTA_TICKS 0xffffffffLL 44293873Ssephe#define HV_MIN_DELTA_TICKS 1LL 45293873Ssephe 46298449Ssephestatic struct eventtimer *et; 47293873Ssephe 48293873Ssephestatic inline uint64_t 49293873Ssephesbintime2tick(sbintime_t time) 50293873Ssephe{ 51293873Ssephe struct timespec val; 52293873Ssephe 53293873Ssephe val = sbttots(time); 54293873Ssephe return val.tv_sec * HV_TIMER_FREQUENCY + val.tv_nsec / 100; 55293873Ssephe} 56293873Ssephe 57293873Ssephestatic int 58293873Ssephehv_et_start(struct eventtimer *et, sbintime_t firsttime, sbintime_t periodtime) 59293873Ssephe{ 60293873Ssephe union hv_timer_config timer_cfg; 61293873Ssephe uint64_t current; 62293873Ssephe 63293873Ssephe timer_cfg.as_uint64 = 0; 64293873Ssephe timer_cfg.auto_enable = 1; 65297176Ssephe timer_cfg.sintx = HV_VMBUS_TIMER_SINT; 66293873Ssephe 67293873Ssephe current = rdmsr(HV_X64_MSR_TIME_REF_COUNT); 68293873Ssephe current += sbintime2tick(firsttime); 69293873Ssephe 70293873Ssephe wrmsr(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64); 71293873Ssephe wrmsr(HV_X64_MSR_STIMER0_COUNT, current); 72293873Ssephe 73293873Ssephe return (0); 74293873Ssephe} 75293873Ssephe 76293873Ssephestatic int 77293873Ssephehv_et_stop(struct eventtimer *et) 78293873Ssephe{ 79293873Ssephe wrmsr(HV_X64_MSR_STIMER0_CONFIG, 0); 80293873Ssephe wrmsr(HV_X64_MSR_STIMER0_COUNT, 0); 81293873Ssephe 82293873Ssephe return (0); 83293873Ssephe} 84293873Ssephe 85293873Ssephevoid 86293873Ssephehv_et_intr(struct trapframe *frame) 87293873Ssephe{ 88293873Ssephe struct trapframe *oldframe; 89293873Ssephe struct thread *td; 90293873Ssephe 91298449Ssephe if (et->et_active) { 92293873Ssephe td = curthread; 93293873Ssephe td->td_intr_nesting_level++; 94293873Ssephe oldframe = td->td_intr_frame; 95293873Ssephe td->td_intr_frame = frame; 96298449Ssephe et->et_event_cb(et, et->et_arg); 97293873Ssephe td->td_intr_frame = oldframe; 98293873Ssephe td->td_intr_nesting_level--; 99293873Ssephe } 100293873Ssephe} 101293873Ssephe 102298449Ssephestatic void 103298449Ssephehv_et_identify (driver_t *driver, device_t parent) 104293873Ssephe{ 105298449Ssephe if (device_find_child(parent, "hv_et", -1) != NULL) 106298449Ssephe return; 107298449Ssephe 108298449Ssephe device_add_child(parent, "hv_et", -1); 109293873Ssephe} 110293873Ssephe 111298449Ssephestatic int 112298449Ssephehv_et_probe(device_t dev) 113298449Ssephe{ 114298449Ssephe device_set_desc(dev, "Hyper-V event timer"); 115298449Ssephe 116298449Ssephe return (BUS_PROBE_NOWILDCARD); 117298449Ssephe} 118298449Ssephe 119298449Ssephestatic int 120298449Ssephehv_et_attach(device_t dev) 121298449Ssephe{ 122298449Ssephe /* XXX: need allocate SINT and remove global et */ 123298449Ssephe et = device_get_softc(dev); 124298449Ssephe 125298449Ssephe et->et_name = "Hyper-V"; 126298449Ssephe et->et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERCPU; 127298449Ssephe et->et_quality = 1000; 128298449Ssephe et->et_frequency = HV_TIMER_FREQUENCY; 129298449Ssephe et->et_min_period = HV_MIN_DELTA_TICKS * ((1LL << 32) / HV_TIMER_FREQUENCY); 130298449Ssephe et->et_max_period = HV_MAX_DELTA_TICKS * ((1LL << 32) / HV_TIMER_FREQUENCY); 131298449Ssephe et->et_start = hv_et_start; 132298449Ssephe et->et_stop = hv_et_stop; 133298449Ssephe et->et_priv = dev; 134298449Ssephe 135298449Ssephe return (et_register(et)); 136298449Ssephe} 137298449Ssephe 138298449Ssephestatic int 139298449Ssephehv_et_detach(device_t dev) 140298449Ssephe{ 141298449Ssephe return (et_deregister(et)); 142298449Ssephe} 143298449Ssephe 144298449Ssephestatic device_method_t hv_et_methods[] = { 145298449Ssephe DEVMETHOD(device_identify, hv_et_identify), 146298449Ssephe DEVMETHOD(device_probe, hv_et_probe), 147298449Ssephe DEVMETHOD(device_attach, hv_et_attach), 148298449Ssephe DEVMETHOD(device_detach, hv_et_detach), 149298449Ssephe 150298449Ssephe DEVMETHOD_END 151298449Ssephe}; 152298449Ssephe 153298449Ssephestatic driver_t hv_et_driver = { 154298449Ssephe "hv_et", 155298449Ssephe hv_et_methods, 156298449Ssephe sizeof(struct eventtimer) 157298449Ssephe}; 158298449Ssephe 159298449Ssephestatic devclass_t hv_et_devclass; 160298449SsepheDRIVER_MODULE(hv_et, vmbus, hv_et_driver, hv_et_devclass, NULL, 0); 161298449SsepheMODULE_VERSION(hv_et, 1); 162