1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010-2016 Solarflare Communications Inc. 5 * All rights reserved. 6 * 7 * This software was developed in part by Philip Paeps under contract for 8 * Solarflare Communications, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * The views and conclusions contained in the software and documentation are 32 * those of the authors and should not be interpreted as representing official 33 * policies, either expressed or implied, of the FreeBSD Project. 34 */ 35 36 #include <sys/cdefs.h> 37 #include <sys/param.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/queue.h> 42 #include <sys/taskqueue.h> 43 44 #include <machine/bus.h> 45 46 #include "common/efx.h" 47 48 #include "sfxge.h" 49 50 static void 51 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) 52 { 53 bus_addr_t *addr; 54 55 addr = arg; 56 57 if (error != 0) { 58 *addr = 0; 59 return; 60 } 61 62 *addr = segs[0].ds_addr; 63 } 64 65 int 66 sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map, 67 struct mbuf **mp, bus_dma_segment_t *segs, 68 int *nsegs, int maxsegs) 69 { 70 bus_dma_segment_t *psegs; 71 struct mbuf *m; 72 int seg_count; 73 int defragged; 74 int err; 75 76 m = *mp; 77 defragged = err = seg_count = 0; 78 79 KASSERT(m->m_pkthdr.len, ("packet has zero header length")); 80 81 retry: 82 psegs = segs; 83 seg_count = 0; 84 if (m->m_next == NULL) { 85 sfxge_map_mbuf_fast(tag, map, m, segs); 86 *nsegs = 1; 87 return (0); 88 } 89 #if defined(__i386__) || defined(__amd64__) 90 while (m != NULL && seg_count < maxsegs) { 91 /* 92 * firmware doesn't like empty segments 93 */ 94 if (m->m_len != 0) { 95 seg_count++; 96 sfxge_map_mbuf_fast(tag, map, m, psegs); 97 psegs++; 98 } 99 m = m->m_next; 100 } 101 #else 102 err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0); 103 #endif 104 if (seg_count == 0) { 105 err = EFBIG; 106 goto err_out; 107 } else if (err == EFBIG || seg_count >= maxsegs) { 108 if (!defragged) { 109 m = m_defrag(*mp, M_NOWAIT); 110 if (m == NULL) { 111 err = ENOBUFS; 112 goto err_out; 113 } 114 *mp = m; 115 defragged = 1; 116 goto retry; 117 } 118 err = EFBIG; 119 goto err_out; 120 } 121 *nsegs = seg_count; 122 123 err_out: 124 return (err); 125 } 126 127 void 128 sfxge_dma_free(efsys_mem_t *esmp) 129 { 130 131 bus_dmamap_unload(esmp->esm_tag, esmp->esm_map); 132 bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map); 133 bus_dma_tag_destroy(esmp->esm_tag); 134 135 esmp->esm_addr = 0; 136 esmp->esm_base = NULL; 137 esmp->esm_size = 0; 138 } 139 140 int 141 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp) 142 { 143 void *vaddr; 144 145 /* Create the child DMA tag. */ 146 if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0, 147 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL, 148 NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) { 149 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n"); 150 goto fail_tag_create; 151 } 152 153 /* Allocate kernel memory. */ 154 if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr, 155 BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO, 156 &esmp->esm_map) != 0) { 157 device_printf(sc->dev, "Couldn't allocate DMA memory\n"); 158 goto fail_alloc; 159 } 160 161 /* Load map into device memory. */ 162 if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len, 163 sfxge_dma_cb, &esmp->esm_addr, 0) != 0) { 164 device_printf(sc->dev, "Couldn't load DMA mapping\n"); 165 goto fail_load; 166 } 167 168 /* 169 * The callback gets error information about the mapping 170 * and will have set esm_addr to 0 if something went 171 * wrong. 172 */ 173 if (esmp->esm_addr == 0) 174 goto fail_load_check; 175 176 esmp->esm_base = vaddr; 177 esmp->esm_size = len; 178 179 return (0); 180 181 fail_load_check: 182 fail_load: 183 bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map); 184 fail_alloc: 185 bus_dma_tag_destroy(esmp->esm_tag); 186 fail_tag_create: 187 return (ENOMEM); 188 } 189 190 void 191 sfxge_dma_fini(struct sfxge_softc *sc) 192 { 193 194 bus_dma_tag_destroy(sc->parent_dma_tag); 195 } 196 197 int 198 sfxge_dma_init(struct sfxge_softc *sc) 199 { 200 201 /* Create the parent dma tag. */ 202 if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */ 203 1, 0, /* algnmnt, boundary */ 204 BUS_SPACE_MAXADDR, /* lowaddr */ 205 BUS_SPACE_MAXADDR, /* highaddr */ 206 NULL, NULL, /* filter, filterarg */ 207 BUS_SPACE_MAXSIZE_32BIT, /* maxsize */ 208 BUS_SPACE_UNRESTRICTED, /* nsegments */ 209 BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */ 210 0, /* flags */ 211 NULL, NULL, /* lock, lockarg */ 212 &sc->parent_dma_tag) != 0) { 213 device_printf(sc->dev, "Cannot allocate parent DMA tag\n"); 214 return (ENOMEM); 215 } 216 217 return (0); 218 } 219