1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2021 Microsoft Corp. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/mutex.h> 35 #include <sys/systm.h> 36 37 #include "gdma_util.h" 38 39 40 void 41 init_completion(struct completion *c) 42 { 43 memset(c, 0, sizeof(*c)); 44 mtx_init(&c->lock, "gdma_completion", NULL, MTX_DEF); 45 c->done = 0; 46 } 47 48 void 49 free_completion(struct completion *c) 50 { 51 mtx_destroy(&c->lock); 52 } 53 54 void 55 complete(struct completion *c) 56 { 57 mtx_lock(&c->lock); 58 c->done++; 59 mtx_unlock(&c->lock); 60 wakeup(c); 61 } 62 63 void 64 wait_for_completion(struct completion *c) 65 { 66 mtx_lock(&c->lock); 67 while (c->done == 0) 68 mtx_sleep(c, &c->lock, 0, "gdma_wfc", 0); 69 c->done--; 70 mtx_unlock(&c->lock); 71 } 72 73 /* 74 * Return: 0 if completed, a non-zero value if timed out. 75 */ 76 int 77 wait_for_completion_timeout(struct completion *c, int timeout) 78 { 79 int ret; 80 81 mtx_lock(&c->lock); 82 83 if (c->done == 0) 84 mtx_sleep(c, &c->lock, 0, "gdma_wfc", timeout); 85 86 if (c->done > 0) { 87 c->done--; 88 ret = 0; 89 } else { 90 ret = 1; 91 } 92 93 mtx_unlock(&c->lock); 94 95 return (ret); 96 } 97