1 /*- 2 * Copyright (c) 2017-2019 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 __FBSDID("$FreeBSD$"); 33 34 #include "opt_platform.h" 35 #include <sys/param.h> 36 #include <sys/conf.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/mbuf.h> 41 #include <sys/mutex.h> 42 43 #include <machine/bus.h> 44 45 #ifdef FDT 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 #endif 50 51 #include <dev/xdma/xdma.h> 52 53 int 54 xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp, 55 xdma_transfer_status_t *status) 56 { 57 struct xdma_request *xr; 58 struct xdma_request *xr_tmp; 59 60 QUEUE_OUT_LOCK(xchan); 61 TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) { 62 TAILQ_REMOVE(&xchan->queue_out, xr, xr_next); 63 break; 64 } 65 QUEUE_OUT_UNLOCK(xchan); 66 67 if (xr == NULL) 68 return (-1); 69 70 *mp = xr->m; 71 status->error = xr->status.error; 72 status->transferred = xr->status.transferred; 73 74 xchan_bank_put(xchan, xr); 75 76 return (0); 77 } 78 79 int 80 xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp, 81 uintptr_t addr, uint8_t src_width, uint8_t dst_width, 82 enum xdma_direction dir) 83 { 84 struct xdma_request *xr; 85 xdma_controller_t *xdma; 86 87 xdma = xchan->xdma; 88 89 xr = xchan_bank_get(xchan); 90 if (xr == NULL) 91 return (-1); /* No space is available yet. */ 92 93 xr->direction = dir; 94 xr->m = *mp; 95 xr->req_type = XR_TYPE_MBUF; 96 if (dir == XDMA_MEM_TO_DEV) { 97 xr->dst_addr = addr; 98 xr->src_addr = 0; 99 } else { 100 xr->src_addr = addr; 101 xr->dst_addr = 0; 102 } 103 xr->src_width = src_width; 104 xr->dst_width = dst_width; 105 106 QUEUE_IN_LOCK(xchan); 107 TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next); 108 QUEUE_IN_UNLOCK(xchan); 109 110 return (0); 111 } 112 113 uint32_t 114 xdma_mbuf_chain_count(struct mbuf *m0) 115 { 116 struct mbuf *m; 117 uint32_t c; 118 119 c = 0; 120 121 for (m = m0; m != NULL; m = m->m_next) 122 c++; 123 124 return (c); 125 } 126 127 uint32_t 128 xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr) 129 { 130 xdma_controller_t *xdma; 131 struct mbuf *m; 132 uint32_t c; 133 134 xdma = xchan->xdma; 135 136 c = xdma_mbuf_chain_count(xr->m); 137 if (c == 1) 138 return (c); /* Nothing to do. */ 139 140 if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) { 141 device_printf(xdma->dma_dev, 142 "%s: Can't defrag mbuf\n", 143 __func__); 144 return (c); 145 } 146 147 xr->m = m; 148 c = 1; 149 150 return (c); 151 } 152