2 * Copyright (c) 2010-2011 Solarflare Communications, Inc.
5 * This software was developed in part by Philip Paeps under contract for
6 * Solarflare Communications, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/queue.h>
38 #include <sys/taskqueue.h>
40 #include <machine/bus.h>
42 #include "common/efx.h"
47 sfxge_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
58 *addr = segs[0].ds_addr;
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)
65 bus_dma_segment_t *psegs;
72 defragged = err = seg_count = 0;
74 KASSERT(m->m_pkthdr.len, ("packet has zero header length"));
79 if (m->m_next == NULL) {
80 sfxge_map_mbuf_fast(tag, map, m, segs);
84 #if defined(__i386__) || defined(__amd64__)
85 while (m != NULL && seg_count < maxsegs) {
87 * firmware doesn't like empty segments
91 sfxge_map_mbuf_fast(tag, map, m, psegs);
97 err = bus_dmamap_load_mbuf_sg(tag, map, *mp, segs, &seg_count, 0);
102 } else if (err == EFBIG || seg_count >= maxsegs) {
104 m = m_defrag(*mp, M_NOWAIT);
123 sfxge_dma_free(efsys_mem_t *esmp)
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);
131 esmp->esm_base = NULL;
135 sfxge_dma_alloc(struct sfxge_softc *sc, bus_size_t len, efsys_mem_t *esmp)
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 goto fail_tag_create;
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");
155 /* Load map into device memory. */
156 if (bus_dmamap_load(esmp->esm_tag, esmp->esm_map, vaddr, len,
157 sfxge_dma_cb, &esmp->esm_addr, 0) != 0) {
158 device_printf(sc->dev, "Couldn't load DMA mapping\n");
163 * The callback gets error information about the mapping
164 * and will have set esm_addr to 0 if something went
167 if (esmp->esm_addr == 0)
168 goto fail_load_check;
170 esmp->esm_base = vaddr;
176 bus_dmamem_free(esmp->esm_tag, vaddr, esmp->esm_map);
178 bus_dma_tag_destroy(esmp->esm_tag);
184 sfxge_dma_fini(struct sfxge_softc *sc)
187 bus_dma_tag_destroy(sc->parent_dma_tag);
191 sfxge_dma_init(struct sfxge_softc *sc)
194 /* Create the parent dma tag. */
195 if (bus_dma_tag_create(bus_get_dma_tag(sc->dev), /* parent */
196 1, 0, /* algnmnt, boundary */
197 BUS_SPACE_MAXADDR, /* lowaddr */
198 BUS_SPACE_MAXADDR, /* highaddr */
199 NULL, NULL, /* filter, filterarg */
200 BUS_SPACE_MAXSIZE_32BIT, /* maxsize */
201 BUS_SPACE_UNRESTRICTED, /* nsegments */
202 BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
204 NULL, NULL, /* lock, lockarg */
205 &sc->parent_dma_tag) != 0) {
206 device_printf(sc->dev, "Cannot allocate parent DMA tag\n");