1 /*- 2 * Copyright (c) 2018-2019 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "opt_platform.h" 33 #include <sys/param.h> 34 #include <sys/conf.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 41 #include <machine/bus.h> 42 43 #include <dev/xdma/xdma.h> 44 45 void 46 xchan_bank_init(xdma_channel_t *xchan) 47 { 48 struct xdma_request *xr; 49 int i; 50 51 KASSERT(xchan->xdma != NULL, ("xdma is NULL")); 52 53 xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num, 54 M_XDMA, M_WAITOK | M_ZERO); 55 56 for (i = 0; i < xchan->xr_num; i++) { 57 xr = &xchan->xr_mem[i]; 58 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next); 59 } 60 } 61 62 int 63 xchan_bank_free(xdma_channel_t *xchan) 64 { 65 66 free(xchan->xr_mem, M_XDMA); 67 68 return (0); 69 } 70 71 struct xdma_request * 72 xchan_bank_get(xdma_channel_t *xchan) 73 { 74 struct xdma_request *xr; 75 struct xdma_request *xr_tmp; 76 77 QUEUE_BANK_LOCK(xchan); 78 TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) { 79 TAILQ_REMOVE(&xchan->bank, xr, xr_next); 80 break; 81 } 82 QUEUE_BANK_UNLOCK(xchan); 83 84 return (xr); 85 } 86 87 int 88 xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr) 89 { 90 91 QUEUE_BANK_LOCK(xchan); 92 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next); 93 QUEUE_BANK_UNLOCK(xchan); 94 95 return (0); 96 } 97