The branch main has been updated by bz:
URL:
https://cgit.FreeBSD.org/src/commit/?id=fed248a6acb33cf6d51880be8d5c774d89e75110
commit fed248a6acb33cf6d51880be8d5c774d89e75110
Author: Bjoern A. Zeeb <b...@freebsd.org>
AuthorDate: 2021-07-01 13:29:49 +0000
Commit: Bjoern A. Zeeb <b...@freebsd.org>
CommitDate: 2021-07-28 16:21:12 +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.
MFC after: 10 days
Reviewed by: hsealsky
Differential Revision: https://reviews.freebsd.org/D30980
---
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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