Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/iopoll.h
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020-2021 Bjoern A. Zeeb 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef _LINUXKPI_LINUX_IOPOLL_H 31 #define _LINUXKPI_LINUX_IOPOLL_H 32 33 #include <sys/types.h> 34 #include <sys/time.h> 35 #include <linux/delay.h> 36 37 #define read_poll_timeout(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \ 38 ({ \ 39 struct timeval __now, __end; \ 40 if (_to) { \ 41 __end.tv_sec = (_to) / USEC_PER_SEC; \ 42 __end.tv_usec = (_to) % USEC_PER_SEC; \ 43 microtime(&__now); \ 44 timevaladd(&__end, &__now); \ 45 } \ 46 \ 47 if ((_early_sleep) && (_us) > 0) \ 48 usleep_range(_us, _us); \ 49 do { \ 50 (_var) = _pollfp(__VA_ARGS__); \ 51 if (_cond) \ 52 break; \ 53 if (_to) { \ 54 microtime(&__now); \ 55 if (timevalcmp(&__now, &__end, >)) \ 56 break; \ 57 } \ 58 if ((_us) != 0) \ 59 usleep_range(_us, _us); \ 60 } while (1); \ 61 (_cond) ? 0 : (-ETIMEDOUT); \ 62 }) 63 64 #define readx_poll_timeout(_pollfp, _addr, _var, _cond, _us, _to) \ 65 read_poll_timeout(_pollfp, _var, _cond, _us, _to, false, _addr) 66 67 #define read_poll_timeout_atomic(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \ 68 ({ \ 69 struct timeval __now, __end; \ 70 if (_to) { \ 71 __end.tv_sec = (_to) / USEC_PER_SEC; \ 72 __end.tv_usec = (_to) % USEC_PER_SEC; \ 73 microtime(&__now); \ 74 timevaladd(&__end, &__now); \ 75 } \ 76 \ 77 if ((_early_sleep) && (_us) > 0) \ 78 DELAY(_us); \ 79 do { \ 80 (_var) = _pollfp(__VA_ARGS__); \ 81 if (_cond) \ 82 break; \ 83 if (_to) { \ 84 microtime(&__now); \ 85 if (timevalcmp(&__now, &__end, >)) \ 86 break; \ 87 } \ 88 if ((_us) != 0) \ 89 DELAY(_us); \ 90 } while (1); \ 91 (_cond) ? 0 : (-ETIMEDOUT); \ 92 }) 93 94 #endif /* _LINUXKPI_LINUX_IOPOLL_H */
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