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 #include <sys/types.h> 32 #include <sys/mutex.h> 33 #include <sys/systm.h> 34 35 #include "gdma_util.h" 36 37 38 void 39 init_completion(struct completion *c) 40 { 41 memset(c, 0, sizeof(*c)); 42 mtx_init(&c->lock, "gdma_completion", NULL, MTX_DEF); 43 c->done = 0; 44 } 45 46 void 47 free_completion(struct completion *c) 48 { 49 mtx_destroy(&c->lock); 50 } 51 52 void 53 complete(struct completion *c) 54 { 55 mtx_lock(&c->lock); 56 c->done++; 57 mtx_unlock(&c->lock); 58 wakeup(c); 59 } 60 61 void 62 wait_for_completion(struct completion *c) 63 { 64 mtx_lock(&c->lock); 65 while (c->done == 0) 66 mtx_sleep(c, &c->lock, 0, "gdma_wfc", 0); 67 c->done--; 68 mtx_unlock(&c->lock); 69 } 70 71 /* 72 * Return: 0 if completed, a non-zero value if timed out. 73 */ 74 int 75 wait_for_completion_timeout(struct completion *c, int timeout) 76 { 77 int ret; 78 79 mtx_lock(&c->lock); 80 81 if (c->done == 0) 82 mtx_sleep(c, &c->lock, 0, "gdma_wfc", timeout); 83 84 if (c->done > 0) { 85 c->done--; 86 ret = 0; 87 } else { 88 ret = 1; 89 } 90 91 mtx_unlock(&c->lock); 92 93 return (ret); 94 } 95