Move the ACPI PM timer emulation into vmm.ko.

This reduces variability during timer calibration by keeping the emulation
"close" to the guest. Additionally having all timer emulations in the kernel
will ease the transition to a per-VM clock source (as opposed to using the
host's uptime keep track of time).

Discussed with:	grehan

2 files changed, 0 insertions, 174 deletions

diff --git a/usr.sbin/bhyve/Makefile b/usr.sbin/bhyve/Makefile
index 1c95f77..377a2e6 100644
--- a/usr.sbin/bhyve/Makefile
+++ b/usr.sbin/bhyve/Makefile
@@ -31,7 +31,6 @@ SRCS=	\
 	pci_virtio_rnd.c	\
 	pci_uart.c		\
 	pm.c			\
-	pmtmr.c			\
 	post.c			\
 	rtc.c			\
 	smbiostbl.c		\
diff --git a/usr.sbin/bhyve/pmtmr.c b/usr.sbin/bhyve/pmtmr.c
deleted file mode 100644
index 3a46f9b..0000000
--- a/usr.sbin/bhyve/pmtmr.c
+++ /dev/null
@@ -1,173 +0,0 @@
-/*-
- * Copyright (c) 2012 NetApp, Inc.
- * 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 NETAPP, INC ``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 NETAPP, INC 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.
- *
- * $FreeBSD$
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/types.h>
-#include <sys/sysctl.h>
-#include <sys/time.h>
-#include <machine/cpufunc.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-#include <assert.h>
-#include <pthread.h>
-
-#include "acpi.h"
-#include "inout.h"
-
-/*
- * The ACPI Power Management timer is a free-running 24- or 32-bit
- * timer with a frequency of 3.579545MHz
- *
- * This implementation will be 32-bits
- */
-
-#define PMTMR_FREQ	3579545  /* 3.579545MHz */
-
-static pthread_mutex_t pmtmr_mtx;
-static pthread_once_t pmtmr_once = PTHREAD_ONCE_INIT;
-
-static uint64_t	pmtmr_old;
-
-static uint64_t	pmtmr_tscf;
-static uint64_t	pmtmr_tsc_old;
-
-static clockid_t clockid = CLOCK_UPTIME_FAST;
-static struct timespec pmtmr_uptime_old;
-
-#define	timespecsub(vvp, uvp)						\
-	do {								\
-		(vvp)->tv_sec -= (uvp)->tv_sec;				\
-		(vvp)->tv_nsec -= (uvp)->tv_nsec;			\
-		if ((vvp)->tv_nsec < 0) {				\
-			(vvp)->tv_sec--;				\
-			(vvp)->tv_nsec += 1000000000;			\
-		}							\
-	} while (0)
-
-static uint64_t
-timespec_to_pmtmr(const struct timespec *tsnew, const struct timespec *tsold)
-{
-	struct timespec tsdiff;
-	int64_t nsecs;
-
-	tsdiff = *tsnew;
-	timespecsub(&tsdiff, tsold);
-	nsecs = tsdiff.tv_sec * 1000000000 + tsdiff.tv_nsec;
-	assert(nsecs >= 0);
-
-	return (nsecs * PMTMR_FREQ / 1000000000 + pmtmr_old);
-}
-
-static uint64_t
-tsc_to_pmtmr(uint64_t tsc_new, uint64_t tsc_old)
-{
-
-	return ((tsc_new - tsc_old) * PMTMR_FREQ / pmtmr_tscf + pmtmr_old);
-}
-
-static void
-pmtmr_init(void)
-{
-	size_t len;
-	int smp_tsc, err;
-	struct timespec tsnew, tsold = { 0 };
-
-	len = sizeof(smp_tsc);
-	err = sysctlbyname("kern.timecounter.smp_tsc", &smp_tsc, &len, NULL, 0);
-	assert(err == 0);
-
-	if (smp_tsc) {
-		len = sizeof(pmtmr_tscf);
-		err = sysctlbyname("machdep.tsc_freq", &pmtmr_tscf, &len,
-				   NULL, 0);
-		assert(err == 0);
-
-		pmtmr_tsc_old = rdtsc();
-		pmtmr_old = tsc_to_pmtmr(pmtmr_tsc_old, 0);
-	} else {
-		if (getenv("BHYVE_PMTMR_PRECISE") != NULL)
-			clockid = CLOCK_UPTIME;
-
-		err = clock_gettime(clockid, &tsnew);
-		assert(err == 0);
-
-		pmtmr_uptime_old = tsnew;
-		pmtmr_old = timespec_to_pmtmr(&tsnew, &tsold);
-	}
-	pthread_mutex_init(&pmtmr_mtx, NULL);
-}
-
-static uint32_t
-pmtmr_val(void)
-{
-	struct timespec	tsnew;
-	uint64_t	pmtmr_tsc_new;
-	uint64_t	pmtmr_new;
-	int		error;
-
-	pthread_once(&pmtmr_once, pmtmr_init);
-
-	pthread_mutex_lock(&pmtmr_mtx);
-
-	if (pmtmr_tscf) {
-		pmtmr_tsc_new = rdtsc();
-		pmtmr_new = tsc_to_pmtmr(pmtmr_tsc_new, pmtmr_tsc_old);
-		pmtmr_tsc_old = pmtmr_tsc_new;
-	} else {
-		error = clock_gettime(clockid, &tsnew);
-		assert(error == 0);
-
-		pmtmr_new = timespec_to_pmtmr(&tsnew, &pmtmr_uptime_old);
-		pmtmr_uptime_old = tsnew;
-	}
-	pmtmr_old = pmtmr_new;
-
-	pthread_mutex_unlock(&pmtmr_mtx);
-
-	return (pmtmr_new); 
-}
-
-static int
-pmtmr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
-	          uint32_t *eax, void *arg)
-{
-	assert(in == 1);
-
-	if (bytes != 4)
-		return (-1);
-
-	*eax = pmtmr_val();
-
-	return (0);
-}
-
-INOUT_PORT(pmtmr, IO_PMTMR, IOPORT_F_IN, pmtmr_handler);