sfxge_dma.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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 __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/param.h>
   40 #include <sys/bus.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 #include <sys/queue.h>
   44 #include <sys/taskqueue.h>
   45 
   46 #include <machine/bus.h>
   47 
   48 #include "common/efx.h"
   49 
   50 #include "sfxge.h"
   51 
   52 static void
   53 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   54 {
   55         bus_addr_t *addr;
   56 
   57         addr = arg;
   58 
   59         if (error != 0) {
   60                 *addr = 0;
   61                 return;
   62         }
   63 
   64         *addr = segs[0].ds_addr;
   65 }
   66 
   67 int
   68 sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
   69                           struct mbuf **mp, bus_dma_segment_t *segs,
   70                           int *nsegs, int maxsegs)
   71 {
   72         bus_dma_segment_t *psegs;
   73         struct mbuf *m;
   74         int seg_count;
   75         int defragged;
   76         int err;
   77 
   78         m = *mp;
   79         defragged = err = seg_count = 0;
   80 
   81         KASSERT(m->m_pkthdr.len, ("packet has zero header length"));
   82 
   83 retry:
   84         psegs = segs;
   85         seg_count = 0;
   86         if (m->m_next == NULL) {
   87                 sfxge_map_mbuf_fast(tag, map, m, segs);
   88                 *nsegs = 1;
   89                 return (0);
   90         }
   91 #if defined(__i386__) || defined(__amd64__)
   92         while (m != NULL && seg_count < maxsegs) {
   93                 /*
   94                  * firmware doesn't like empty segments
   95                  */
   96                 if (m->m_len != 0) {
   97                         seg_count++;
   98                         sfxge_map_mbuf_fast(tag, map, m, psegs);
   99                         psegs++;
  100                 }
  101                 m = m->m_next;
  102         }
  103 #else
  104         err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0);
  105 #endif
  106         if (seg_count == 0) {
  107                 err = EFBIG;
  108                 goto err_out;
  109         } else if (err == EFBIG || seg_count >= maxsegs) {
  110                 if (!defragged) {
  111                         m = m_defrag(*mp, M_NOWAIT);
  112                         if (m == NULL) {
  113                                 err = ENOBUFS;
  114                                 goto err_out;
  115                         }
  116                         *mp = m;
  117                         defragged = 1;
  118                         goto retry;
  119                 }
  120                 err = EFBIG;
  121                 goto err_out;
  122         }
  123         *nsegs = seg_count;
  124 
  125 err_out:
  126         return (err);
  127 }
  128 
  129 void
  130 sfxge_dma_free(efsys_mem_t *esmp)
  131 {
  132 
  133         bus_dmamap_unload(esmp->esm_tag, esmp->esm_map);
  134         bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map);
  135         bus_dma_tag_destroy(esmp->esm_tag);
  136 
  137         esmp->esm_addr = 0;
  138         esmp->esm_base = NULL;
  139         esmp->esm_size = 0;
  140 }
  141 
  142 int
  143 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
  144 {
  145         void *vaddr;
  146 
  147         /* Create the child DMA tag. */
  148         if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0,
  149             MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
  150             NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) {
  151                 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
  152                 goto fail_tag_create;
  153         }
  154 
  155         /* Allocate kernel memory. */
  156         if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr,
  157             BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
  158             &esmp->esm_map) != 0) {
  159                 device_printf(sc->dev, "Couldn't allocate DMA memory\n");
  160                 goto fail_alloc;
  161         }
  162 
  163         /* Load map into device memory. */
  164         if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
  165             sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
  166                 device_printf(sc->dev, "Couldn't load DMA mapping\n");
  167                 goto fail_load;
  168         }
  169 
  170         /*
  171          * The callback gets error information about the mapping
  172          * and will have set esm_addr to 0 if something went
  173          * wrong.
  174          */
  175         if (esmp->esm_addr == 0)
  176                 goto fail_load_check;
  177 
  178         esmp->esm_base = vaddr;
  179         esmp->esm_size = len;
  180 
  181         return (0);
  182 
  183 fail_load_check:
  184 fail_load:
  185         bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
  186 fail_alloc:
  187         bus_dma_tag_destroy(esmp->esm_tag);
  188 fail_tag_create:
  189         return (ENOMEM);
  190 }
  191 
  192 void
  193 sfxge_dma_fini(struct sfxge_softc *sc)
  194 {
  195 
  196         bus_dma_tag_destroy(sc->parent_dma_tag);
  197 }
  198 
  199 int
  200 sfxge_dma_init(struct sfxge_softc *sc)
  201 {
  202 
  203         /* Create the parent dma tag. */
  204         if (bus_dma_tag_create(bus_get_dma_tag(sc->dev),        /* parent */
  205             1, 0,                       /* algnmnt, boundary */
  206             BUS_SPACE_MAXADDR,          /* lowaddr */
  207             BUS_SPACE_MAXADDR,          /* highaddr */
  208             NULL, NULL,                 /* filter, filterarg */
  209             BUS_SPACE_MAXSIZE_32BIT,    /* maxsize */
  210             BUS_SPACE_UNRESTRICTED,     /* nsegments */
  211             BUS_SPACE_MAXSIZE_32BIT,    /* maxsegsize */
  212             0,                          /* flags */
  213             NULL, NULL,                 /* lock, lockarg */
  214             &sc->parent_dma_tag) != 0) {
  215                 device_printf(sc->dev, "Cannot allocate parent DMA tag\n");
  216                 return (ENOMEM);
  217         }
  218 
  219         return (0);
  220 }

Cache object: f45ad05400b6374f18189bab89aa40b1

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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