219 lines
5.5 KiB
C
219 lines
5.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2010-2016 Solarflare Communications Inc.
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* All rights reserved.
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*
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* This software was developed in part by Philip Paeps under contract for
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* Solarflare Communications, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and documentation are
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* those of the authors and should not be interpreted as representing official
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* policies, either expressed or implied, of the FreeBSD Project.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/taskqueue.h>
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#include <machine/bus.h>
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#include "common/efx.h"
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#include "sfxge.h"
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static void
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sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
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{
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bus_addr_t *addr;
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addr = arg;
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if (error != 0) {
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*addr = 0;
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return;
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}
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*addr = segs[0].ds_addr;
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}
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int
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sfxge_dma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
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struct mbuf **mp, bus_dma_segment_t *segs,
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int *nsegs, int maxsegs)
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{
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bus_dma_segment_t *psegs;
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struct mbuf *m;
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int seg_count;
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int defragged;
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int err;
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m = *mp;
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defragged = err = seg_count = 0;
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KASSERT(m->m_pkthdr.len, ("packet has zero header length"));
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retry:
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psegs = segs;
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seg_count = 0;
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if (m->m_next == NULL) {
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sfxge_map_mbuf_fast(tag, map, m, segs);
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*nsegs = 1;
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return (0);
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}
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#if defined(__i386__) || defined(__amd64__)
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while (m != NULL && seg_count < maxsegs) {
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/*
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* firmware doesn't like empty segments
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*/
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if (m->m_len != 0) {
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seg_count++;
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sfxge_map_mbuf_fast(tag, map, m, psegs);
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psegs++;
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}
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m = m->m_next;
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}
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#else
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err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0);
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#endif
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if (seg_count == 0) {
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err = EFBIG;
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goto err_out;
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} else if (err == EFBIG || seg_count >= maxsegs) {
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if (!defragged) {
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m = m_defrag(*mp, M_NOWAIT);
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if (m == NULL) {
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err = ENOBUFS;
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goto err_out;
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}
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*mp = m;
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defragged = 1;
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goto retry;
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}
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err = EFBIG;
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goto err_out;
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}
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*nsegs = seg_count;
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err_out:
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return (err);
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}
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void
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sfxge_dma_free(efsys_mem_t *esmp)
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{
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bus_dmamap_unload(esmp->esm_tag, esmp->esm_map);
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bus_dmamem_free(esmp->esm_tag, esmp->esm_base, esmp->esm_map);
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bus_dma_tag_destroy(esmp->esm_tag);
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esmp->esm_addr = 0;
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esmp->esm_base = NULL;
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esmp->esm_size = 0;
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}
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int
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sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
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{
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void *vaddr;
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/* Create the child DMA tag. */
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if (bus_dma_tag_create(sc->parent_dma_tag, PAGE_SIZE, 0,
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MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL,
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NULL, len, 1, len, 0, NULL, NULL, &esmp->esm_tag) != 0) {
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device_printf(sc->dev, "Couldn't allocate txq DMA tag\n");
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goto fail_tag_create;
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}
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/* Allocate kernel memory. */
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if (bus_dmamem_alloc(esmp->esm_tag, (void **)&vaddr,
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BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
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&esmp->esm_map) != 0) {
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device_printf(sc->dev, "Couldn't allocate DMA memory\n");
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goto fail_alloc;
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}
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/* Load map into device memory. */
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if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
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sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
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device_printf(sc->dev, "Couldn't load DMA mapping\n");
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goto fail_load;
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}
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/*
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* The callback gets error information about the mapping
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* and will have set esm_addr to 0 if something went
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* wrong.
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*/
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if (esmp->esm_addr == 0)
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goto fail_load_check;
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esmp->esm_base = vaddr;
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esmp->esm_size = len;
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return (0);
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fail_load_check:
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fail_load:
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bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
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fail_alloc:
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bus_dma_tag_destroy(esmp->esm_tag);
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fail_tag_create:
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return (ENOMEM);
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}
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void
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sfxge_dma_fini(struct sfxge_softc *sc)
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{
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bus_dma_tag_destroy(sc->parent_dma_tag);
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}
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int
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sfxge_dma_init(struct sfxge_softc *sc)
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{
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/* Create the parent dma tag. */
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if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */
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1, 0, /* algnmnt, boundary */
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BUS_SPACE_MAXADDR, /* lowaddr */
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BUS_SPACE_MAXADDR, /* highaddr */
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NULL, NULL, /* filter, filterarg */
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BUS_SPACE_MAXSIZE_32BIT, /* maxsize */
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BUS_SPACE_UNRESTRICTED, /* nsegments */
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BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
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0, /* flags */
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NULL, NULL, /* lock, lockarg */
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&sc->parent_dma_tag) != 0) {
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device_printf(sc->dev, "Cannot allocate parent DMA tag\n");
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return (ENOMEM);
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}
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return (0);
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}
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