1 /*- 2 * Copyright (c) 2010-2011 Solarflare Communications, Inc. 3 * All rights reserved. 4 * 5 * This software was developed in part by Philip Paeps under contract for 6 * Solarflare Communications, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/queue.h> 38 #include <sys/taskqueue.h> 39 40 #include <machine/bus.h> 41 42 #include "common/efx.h" 43 44 #include "sfxge.h" 45 46 static void 47 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) 48 { 49 bus_addr_t *addr; 50 51 addr = arg; 52 53 if (error) { 54 *addr = 0; 55 return; 56 } 57 58 *addr = segs[0].ds_addr; 59 } 60 61 int 62 sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map, 63 struct mbuf **mp, bus_dma_segment_t *segs, int *nsegs, int maxsegs) 64 { 65 bus_dma_segment_t *psegs; 66 struct mbuf *m; 67 int seg_count; 68 int defragged; 69 int err; 70 71 m = *mp; 72 defragged = err = seg_count = 0; 73 74 KASSERT(m->m_pkthdr.len, ("packet has zero header length")); 75 76 retry: 77 psegs = segs; 78 seg_count = 0; 79 if (m->m_next == NULL) { 80 sfxge_map_mbuf_fast(tag, map, m, segs); 81 *nsegs = 1; 82 return (0); 83 } 84 #if defined(__i386__) || defined(__amd64__) 85 while (m && seg_count < maxsegs) { 86 /* 87 * firmware doesn't like empty segments 88 */ 89 if (m->m_len != 0) { 90 seg_count++; 91 sfxge_map_mbuf_fast(tag, map, m, psegs); 92 psegs++; 93 } 94 m = m->m_next; 95 } 96 #else 97 err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0); 98 #endif 99 if (seg_count == 0) { 100 err = EFBIG; 101 goto err_out; 102 } else if (err == EFBIG || seg_count >= maxsegs) { 103 if (!defragged) { 104 m = m_defrag(*mp, M_NOWAIT); 105 if (m == NULL) { 106 err = ENOBUFS; 107 goto err_out; 108 } 109 *mp = m; 110 defragged = 1; 111 goto retry; 112 } 113 err = EFBIG; 114 goto err_out; 115 } 116 *nsegs = seg_count; 117 118 err_out: 119 return (err); 120 } 121 122 void 123 sfxge_dma_free(efsys_mem_t *esmp) 124 { 125 126 bus_dmamap_unload(esmp->esm_tag, esmp->esm_map); 127 bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map); 128 bus_dma_tag_destroy(esmp->esm_tag); 129 130 esmp->esm_addr = 0; 131 esmp->esm_base = NULL; 132 } 133 134 int 135 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp) 136 { 137 void *vaddr; 138 139 /* Create the child DMA tag. */ 140 if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0, 141 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL, 142 NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) { 143 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n"); 144 return (ENOMEM); 145 } 146 147 /* Allocate kernel memory. */ 148 if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr, 149 BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO, 150 &esmp->esm_map) != 0) { 151 device_printf(sc->dev, "Couldn't allocate DMA memory\n"); 152 bus_dma_tag_destroy(esmp->esm_tag); 153 return (ENOMEM); 154 } 155 156 /* Load map into device memory. */ 157 if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len, 158 sfxge_dma_cb, &esmp->esm_addr, 0) != 0) { 159 device_printf(sc->dev, "Couldn't load DMA mapping\n"); 160 bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map); 161 bus_dma_tag_destroy(esmp->esm_tag); 162 return (ENOMEM); 163 } 164 165 /* 166 * The callback gets error information about the mapping 167 * and will have set our vaddr to NULL if something went 168 * wrong. 169 */ 170 if (vaddr == NULL) 171 return (ENOMEM); 172 173 esmp->esm_base = vaddr; 174 175 return (0); 176 } 177 178 void 179 sfxge_dma_fini(struct sfxge_softc *sc) 180 { 181 182 bus_dma_tag_destroy(sc->parent_dma_tag); 183 } 184 185 int 186 sfxge_dma_init(struct sfxge_softc *sc) 187 { 188 189 /* Create the parent dma tag. */ 190 if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */ 191 1, 0, /* algnmnt, boundary */ 192 BUS_SPACE_MAXADDR, /* lowaddr */ 193 BUS_SPACE_MAXADDR, /* highaddr */ 194 NULL, NULL, /* filter, filterarg */ 195 BUS_SPACE_MAXSIZE_32BIT, /* maxsize */ 196 BUS_SPACE_UNRESTRICTED, /* nsegments */ 197 BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */ 198 0, /* flags */ 199 NULL, NULL, /* lock, lockarg */ 200 &sc->parent_dma_tag)) { 201 device_printf(sc->dev, "Cannot allocate parent DMA tag\n"); 202 return (ENOMEM); 203 } 204 205 return (0); 206 } 207