sfxge_dma.c

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    1 /*-
    2  * Copyright (c) 2010-2016 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 are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright notice,
   14  *    this list of conditions and the following disclaimer in the documentation
   15  *    and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   27  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * The views and conclusions contained in the software and documentation are
   30  * those of the authors and should not be interpreted as representing official
   31  * policies, either expressed or implied, of the FreeBSD Project.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/11.2/sys/dev/sfxge/sfxge_dma.c 331722 2018-03-29 02:50:57Z eadler $");
   36 
   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 }
  138 
  139 int
  140 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
  141 {
  142         void *vaddr;
  143 
  144         /* Create the child DMA tag. */
  145         if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0,
  146             MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
  147             NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) {
  148                 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
  149                 goto fail_tag_create;
  150         }
  151 
  152         /* Allocate kernel memory. */
  153         if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr,
  154             BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
  155             &esmp->esm_map) != 0) {
  156                 device_printf(sc->dev, "Couldn't allocate DMA memory\n");
  157                 goto fail_alloc;
  158         }
  159 
  160         /* Load map into device memory. */
  161         if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
  162             sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
  163                 device_printf(sc->dev, "Couldn't load DMA mapping\n");
  164                 goto fail_load;
  165         }
  166 
  167         /*
  168          * The callback gets error information about the mapping
  169          * and will have set esm_addr to 0 if something went
  170          * wrong.
  171          */
  172         if (esmp->esm_addr == 0)
  173                 goto fail_load_check;
  174 
  175         esmp->esm_base = vaddr;
  176 
  177         return (0);
  178 
  179 fail_load_check:
  180 fail_load:
  181         bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
  182 fail_alloc:
  183         bus_dma_tag_destroy(esmp->esm_tag);
  184 fail_tag_create:
  185         return (ENOMEM);
  186 }
  187 
  188 void
  189 sfxge_dma_fini(struct sfxge_softc *sc)
  190 {
  191 
  192         bus_dma_tag_destroy(sc->parent_dma_tag);
  193 }
  194 
  195 int
  196 sfxge_dma_init(struct sfxge_softc *sc)
  197 {
  198 
  199         /* Create the parent dma tag. */
  200         if (bus_dma_tag_create(bus_get_dma_tag(sc->dev),        /* parent */
  201             1, 0,                       /* algnmnt, boundary */
  202             BUS_SPACE_MAXADDR,          /* lowaddr */
  203             BUS_SPACE_MAXADDR,          /* highaddr */
  204             NULL, NULL,                 /* filter, filterarg */
  205             BUS_SPACE_MAXSIZE_32BIT,    /* maxsize */
  206             BUS_SPACE_UNRESTRICTED,     /* nsegments */
  207             BUS_SPACE_MAXSIZE_32BIT,    /* maxsegsize */
  208             0,                          /* flags */
  209             NULL, NULL,                 /* lock, lockarg */
  210             &sc->parent_dma_tag) != 0) {
  211                 device_printf(sc->dev, "Cannot allocate parent DMA tag\n");
  212                 return (ENOMEM);
  213         }
  214 
  215         return (0);
  216 }

Cache object: 8452c3ca5b5b1e6e08d38dd946ed2fdc

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FreeBSD/Linux Kernel Cross Reference sys/dev/sfxge/sfxge_dma.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/sfxge/sfxge_dma.c