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LinuxKPI: add read_poll_timeout()

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Add an implementation of read_poll_timeout() and the atomic variant
which I did at some point last year for rtw88 and now updated based
on feedback.

MFC after:	10 days
Reviewed by:	hsealsky
Differential Revision: https://reviews.freebsd.org/D30980
This commit is contained in:
Bjoern A. Zeeb 2021-07-01 13:29:49 +00:00
parent ac959cf544
commit fed248a6ac
1 changed files with 91 additions and 0 deletions
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91
sys/compat/linuxkpi/common/include/linux/iopoll.h Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020-2021 Bjoern A. Zeeb
*
* 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.
*
* $FreeBSD$
*/
#ifndef __LINUXKPI_LINUX_IOPOLL_H
#define __LINUXKPI_LINUX_IOPOLL_H
#include <sys/types.h>
#include <sys/time.h>
#include <linux/delay.h>
#define read_poll_timeout(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \
({ \
struct timeval __now, __end; \
if (_to) { \
__end.tv_sec = (_to) / USEC_PER_SEC; \
__end.tv_usec = (_to) % USEC_PER_SEC; \
microtime(&__now); \
timevaladd(&__end, &__now); \
} \
\
if ((_early_sleep) && (_us) > 0) \
usleep_range(_us, _us); \
do { \
(_var) = _pollfp(__VA_ARGS__); \
if (_cond) \
break; \
if (_to) { \
microtime(&__now); \
if (timevalcmp(&__now, &__end, >)) \
break; \
} \
if ((_us) != 0) \
usleep_range(_us, _us); \
} while (1); \
(_cond) ? 0 : (-ETIMEDOUT); \
})
#define read_poll_timeout_atomic(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \
({ \
struct timeval __now, __end; \
if (_to) { \
__end.tv_sec = (_to) / USEC_PER_SEC; \
__end.tv_usec = (_to) % USEC_PER_SEC; \
microtime(&__now); \
timevaladd(&__end, &__now); \
} \
\
if ((_early_sleep) && (_us) > 0) \
DELAY(_us); \
do { \
(_var) = _pollfp(__VA_ARGS__); \
if (_cond) \
break; \
if (_to) { \
microtime(&__now); \
if (timevalcmp(&__now, &__end, >)) \
break; \
} \
if ((_us) != 0) \
DELAY(_us); \
} while (1); \
(_cond) ? 0 : (-ETIMEDOUT); \
})
#endif /* __LINUXKPI_LINUX_IOPOLL_H */