2016-01-14 03:05:10 +00:00
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/*-
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2016-04-22 05:01:43 +00:00
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* Copyright (c) 2015,2016 Microsoft Corp.
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2016-01-14 03:05:10 +00:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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2016-04-22 05:15:59 +00:00
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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2016-01-14 03:05:10 +00:00
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#include <sys/proc.h>
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#include <sys/smp.h>
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2016-07-28 06:46:10 +00:00
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#include <sys/systm.h>
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2016-01-14 03:05:10 +00:00
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#include <sys/timeet.h>
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2016-05-27 06:12:43 +00:00
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#include <dev/hyperv/vmbus/hyperv_reg.h>
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2016-05-27 07:29:31 +00:00
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#include <dev/hyperv/vmbus/hyperv_var.h>
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2016-05-30 08:42:35 +00:00
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#include <dev/hyperv/vmbus/vmbus_var.h>
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2016-01-14 03:05:10 +00:00
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2016-05-30 09:35:36 +00:00
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#define VMBUS_ET_NAME "hvet"
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2016-05-27 06:12:43 +00:00
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#define MSR_HV_STIMER0_CFG_SINT \
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2016-05-30 08:42:35 +00:00
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((((uint64_t)VMBUS_SINT_TIMER) << MSR_HV_STIMER_CFG_SINT_SHIFT) & \
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2016-05-27 06:12:43 +00:00
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MSR_HV_STIMER_CFG_SINT_MASK)
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2016-05-27 07:29:31 +00:00
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/*
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* Two additionally required features:
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* - SynIC is needed for interrupt generation.
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* - Time reference counter is needed to set ABS reference count to
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* STIMER0_COUNT.
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*/
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#define CPUID_HV_ET_MASK (CPUID_HV_MSR_TIME_REFCNT | \
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CPUID_HV_MSR_SYNIC | \
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CPUID_HV_MSR_SYNTIMER)
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2016-07-29 05:49:12 +00:00
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static void vmbus_et_identify(driver_t *, device_t);
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static int vmbus_et_probe(device_t);
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static int vmbus_et_attach(device_t);
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static int vmbus_et_detach(device_t);
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static int vmbus_et_start(struct eventtimer *, sbintime_t,
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sbintime_t);
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2016-05-30 08:50:33 +00:00
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static struct eventtimer vmbus_et;
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2016-01-14 03:05:10 +00:00
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2016-07-29 05:58:24 +00:00
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static device_method_t vmbus_et_methods[] = {
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DEVMETHOD(device_identify, vmbus_et_identify),
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DEVMETHOD(device_probe, vmbus_et_probe),
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DEVMETHOD(device_attach, vmbus_et_attach),
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DEVMETHOD(device_detach, vmbus_et_detach),
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DEVMETHOD_END
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};
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static driver_t vmbus_et_driver = {
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VMBUS_ET_NAME,
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vmbus_et_methods,
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0
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};
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static devclass_t vmbus_et_devclass;
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DRIVER_MODULE(hv_et, vmbus, vmbus_et_driver, vmbus_et_devclass, NULL, NULL);
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MODULE_VERSION(hv_et, 1);
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2016-05-30 08:25:09 +00:00
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static __inline uint64_t
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2016-05-30 09:35:36 +00:00
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hyperv_sbintime2count(sbintime_t time)
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2016-01-14 03:05:10 +00:00
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{
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struct timespec val;
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val = sbttots(time);
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2016-05-30 09:20:08 +00:00
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return (val.tv_sec * HYPERV_TIMER_FREQ) +
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(val.tv_nsec / HYPERV_TIMER_NS_FACTOR);
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2016-01-14 03:05:10 +00:00
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}
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static int
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2016-05-30 09:35:36 +00:00
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vmbus_et_start(struct eventtimer *et __unused, sbintime_t first,
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sbintime_t period __unused)
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2016-01-14 03:05:10 +00:00
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{
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2016-05-30 08:25:09 +00:00
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uint64_t current;
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2016-01-14 03:05:10 +00:00
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2016-05-27 06:12:43 +00:00
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current = rdmsr(MSR_HV_TIME_REF_COUNT);
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2016-05-30 09:35:36 +00:00
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current += hyperv_sbintime2count(first);
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2016-05-27 06:12:43 +00:00
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wrmsr(MSR_HV_STIMER0_COUNT, current);
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2016-01-14 03:05:10 +00:00
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return (0);
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}
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void
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2016-05-30 08:42:35 +00:00
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vmbus_et_intr(struct trapframe *frame)
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2016-01-14 03:05:10 +00:00
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{
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struct trapframe *oldframe;
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struct thread *td;
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2016-05-30 08:50:33 +00:00
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if (vmbus_et.et_active) {
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2016-01-14 03:05:10 +00:00
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td = curthread;
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td->td_intr_nesting_level++;
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oldframe = td->td_intr_frame;
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td->td_intr_frame = frame;
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2016-05-30 08:50:33 +00:00
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vmbus_et.et_event_cb(&vmbus_et, vmbus_et.et_arg);
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2016-01-14 03:05:10 +00:00
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td->td_intr_frame = oldframe;
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td->td_intr_nesting_level--;
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}
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}
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2016-04-22 05:15:59 +00:00
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static void
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2016-05-30 09:35:36 +00:00
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vmbus_et_identify(driver_t *driver, device_t parent)
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2016-01-14 03:05:10 +00:00
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{
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2016-05-30 08:50:33 +00:00
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if (device_get_unit(parent) != 0 ||
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2016-05-30 09:35:36 +00:00
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device_find_child(parent, VMBUS_ET_NAME, -1) != NULL ||
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2016-05-27 07:29:31 +00:00
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(hyperv_features & CPUID_HV_ET_MASK) != CPUID_HV_ET_MASK)
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2016-04-22 05:15:59 +00:00
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return;
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2016-05-30 09:35:36 +00:00
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device_add_child(parent, VMBUS_ET_NAME, -1);
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2016-04-22 05:15:59 +00:00
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}
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static int
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2016-05-30 09:35:36 +00:00
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vmbus_et_probe(device_t dev)
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2016-04-22 05:15:59 +00:00
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{
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2016-05-30 09:44:17 +00:00
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if (resource_disabled(VMBUS_ET_NAME, 0))
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return (ENXIO);
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2016-04-22 05:15:59 +00:00
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device_set_desc(dev, "Hyper-V event timer");
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return (BUS_PROBE_NOWILDCARD);
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2016-01-14 03:05:10 +00:00
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}
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2016-05-30 08:25:09 +00:00
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static void
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vmbus_et_config(void *arg __unused)
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{
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/*
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* Make sure that STIMER0 is really disabled before writing
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* to STIMER0_CONFIG.
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*
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* "Writing to the configuration register of a timer that
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* is already enabled may result in undefined behaviour."
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*/
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for (;;) {
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uint64_t val;
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/* Stop counting, and this also implies disabling STIMER0 */
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wrmsr(MSR_HV_STIMER0_COUNT, 0);
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val = rdmsr(MSR_HV_STIMER0_CONFIG);
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if ((val & MSR_HV_STIMER_CFG_ENABLE) == 0)
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break;
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cpu_spinwait();
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}
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wrmsr(MSR_HV_STIMER0_CONFIG,
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MSR_HV_STIMER_CFG_AUTOEN | MSR_HV_STIMER0_CFG_SINT);
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}
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2016-04-22 05:15:59 +00:00
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static int
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2016-05-30 09:35:36 +00:00
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vmbus_et_attach(device_t dev)
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2016-04-22 05:15:59 +00:00
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{
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2016-05-30 08:50:33 +00:00
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/* TODO: use independent IDT vector */
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vmbus_et.et_name = "Hyper-V";
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vmbus_et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERCPU;
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vmbus_et.et_quality = 1000;
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2016-05-30 09:20:08 +00:00
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vmbus_et.et_frequency = HYPERV_TIMER_FREQ;
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vmbus_et.et_min_period = (0x00000001ULL << 32) / HYPERV_TIMER_FREQ;
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vmbus_et.et_max_period = (0xfffffffeULL << 32) / HYPERV_TIMER_FREQ;
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2016-05-30 09:35:36 +00:00
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vmbus_et.et_start = vmbus_et_start;
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2016-04-22 05:15:59 +00:00
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2016-05-30 08:25:09 +00:00
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/*
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* Delay a bit to make sure that MSR_HV_TIME_REF_COUNT will
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* not return 0, since writing 0 to STIMER0_COUNT will disable
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* STIMER0.
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*/
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DELAY(100);
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smp_rendezvous(NULL, vmbus_et_config, NULL, NULL);
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2016-05-30 08:50:33 +00:00
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return (et_register(&vmbus_et));
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2016-04-22 05:15:59 +00:00
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}
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static int
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2016-05-30 09:35:36 +00:00
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vmbus_et_detach(device_t dev)
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2016-04-22 05:15:59 +00:00
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{
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2016-05-30 08:50:33 +00:00
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return (et_deregister(&vmbus_et));
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2016-04-22 05:15:59 +00:00
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}
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