Date: Fri, 19 Nov 2021 00:02:22 GMT From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 9342ec5077f4 - stable/13 - LinuxKPI: add read_poll_timeout() Message-ID: <202111190002.1AJ02Mso072151@gitrepo.freebsd.org>
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The branch stable/13 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=9342ec5077f4e198394ec8648a3834524c684d6d commit 9342ec5077f4e198394ec8648a3834524c684d6d Author: Bjoern A. Zeeb <bz@FreeBSD.org> AuthorDate: 2021-07-01 13:29:49 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2021-11-19 00:01:23 +0000 LinuxKPI: add read_poll_timeout() 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. (cherry picked from commit fed248a6acb33cf6d51880be8d5c774d89e75110) --- sys/compat/linuxkpi/common/include/linux/iopoll.h | 91 +++++++++++++++++++++++ 1 file changed, 91 insertions(+) diff --git a/sys/compat/linuxkpi/common/include/linux/iopoll.h b/sys/compat/linuxkpi/common/include/linux/iopoll.h new file mode 100644 index 000000000000..ea876042eab6 --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/iopoll.h @@ -0,0 +1,91 @@ +/*- + * 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 */
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