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