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Implement parts of the hrtimer API in the LinuxKPI.

Browse Source 
Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11359
This commit is contained in:
Mark Johnston 2017-06-26 16:28:46 +00:00
parent deb808ad3b
commit 9ea3e14182
4 changed files with 190 additions and 0 deletions
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79
sys/compat/linuxkpi/common/include/linux/hrtimer.h Normal file
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@ -0,0 +1,79 @@
/*-
* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
* 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 unmodified, 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 ``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 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.
*
* $FreeBSD$
*/
#ifndef _LINUX_HRTIMER_H_
#define _LINUX_HRTIMER_H_
#include <sys/_callout.h>
#include <sys/_mutex.h>
#include <linux/ktime.h>
#include <linux/timer.h>
enum hrtimer_mode {
HRTIMER_MODE_REL,
};
enum hrtimer_restart {
HRTIMER_RESTART,
HRTIMER_NORESTART,
};
struct hrtimer {
enum hrtimer_restart (*function)(struct hrtimer *);
struct mtx mtx;
struct callout callout;
uint32_t flags;
};
#define hrtimer_active(hrtimer) linux_hrtimer_active(hrtimer)
#define hrtimer_cancel(hrtimer) linux_hrtimer_cancel(hrtimer)
#define hrtimer_init(hrtimer, clock, mode) do { \
CTASSERT((clock) == CLOCK_MONOTONIC); \
CTASSERT((mode) == HRTIMER_MODE_REL); \
linux_hrtimer_init(hrtimer); \
} while (0)
#define hrtimer_set_expires(hrtimer, time) \
linux_hrtimer_set_expires(hrtimer, time)
#define hrtimer_start(hrtimer, time, mode) do { \
CTASSERT((mode) == HRTIMER_MODE_REL); \
linux_hrtimer_start(hrtimer, time); \
} while (0)
#define hrtimer_start_range_ns(hrtimer, time, prec, mode) do { \
CTASSERT((mode) == HRTIMER_MODE_REL); \
linux_hrtimer_start_range_ns(hrtimer, time, prec); \
} while (0)
bool linux_hrtimer_active(struct hrtimer *);
int linux_hrtimer_cancel(struct hrtimer *);
void linux_hrtimer_init(struct hrtimer *);
void linux_hrtimer_set_expires(struct hrtimer *, ktime_t);
void linux_hrtimer_start(struct hrtimer *, ktime_t);
void linux_hrtimer_start_range_ns(struct hrtimer *, ktime_t, int64_t);
#endif /* _LINUX_HRTIMER_H_ */

108
sys/compat/linuxkpi/common/src/linux_hrtimer.c Normal file
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@ -0,0 +1,108 @@
/*-
* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
* 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 unmodified, 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 ``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 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/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/time.h>
#include <machine/cpu.h>
#include <linux/hrtimer.h>
/* hrtimer flags */
#define HRTIMER_ACTIVE 0x01
static void
hrtimer_call_handler(void *arg)
{
struct hrtimer *hrtimer;
enum hrtimer_restart ret;
hrtimer = arg;
ret = hrtimer->function(hrtimer);
MPASS(ret == HRTIMER_NORESTART);
hrtimer->flags &= ~HRTIMER_ACTIVE;
}
bool
linux_hrtimer_active(struct hrtimer *hrtimer)
{
bool ret;
mtx_lock(&hrtimer->mtx);
ret = (hrtimer->flags & HRTIMER_ACTIVE) != 0;
mtx_unlock(&hrtimer->mtx);
return (ret);
}
int
linux_hrtimer_cancel(struct hrtimer *hrtimer)
{
if (!hrtimer_active(hrtimer))
return (0);
(void)callout_drain(&hrtimer->callout);
return (1);
}
void
linux_hrtimer_init(struct hrtimer *hrtimer)
{
hrtimer->function = NULL;
hrtimer->flags = 0;
mtx_init(&hrtimer->mtx, "hrtimer", NULL, MTX_DEF | MTX_RECURSE);
callout_init_mtx(&hrtimer->callout, &hrtimer->mtx, 0);
}
void
linux_hrtimer_set_expires(struct hrtimer *hrtimer __unused,
ktime_t time __unused)
{
}
void
linux_hrtimer_start(struct hrtimer *hrtimer, ktime_t time)
{
linux_hrtimer_start_range_ns(hrtimer, time, 0);
}
void
linux_hrtimer_start_range_ns(struct hrtimer *hrtimer, ktime_t time, int64_t nsec)
{
mtx_lock(&hrtimer->mtx);
callout_reset_sbt(&hrtimer->callout, time.tv64 * SBT_1NS,
nsec * SBT_1NS, hrtimer_call_handler, hrtimer, 0);
hrtimer->flags |= HRTIMER_ACTIVE;
mtx_unlock(&hrtimer->mtx);
}

2
sys/conf/files
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@ -4269,6 +4269,8 @@ compat/linuxkpi/common/src/linux_compat.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_current.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_hrtimer.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_kthread.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_lock.c optional compat_linuxkpi \

1
sys/modules/linuxkpi/Makefile
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@ -5,6 +5,7 @@ KMOD= linuxkpi
SRCS= linux_kmod.c \
linux_compat.c \
linux_current.c \
linux_hrtimer.c \
linux_kthread.c \
linux_lock.c \
linux_page.c \