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https://git.rtems.org/rtems-libbsd/
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4820ccecc9
Some targets support only flushing or invalidating complete cache lines. In this cases misaligned buffers might lead to unexpected results. This patch adds a flag that allows drivers to signal to the bus dma driver that it is OK to round a buffer to the next full cache line. That's for example necessary if a driver wants to send out 14 byte via a USB DMA. Only the driver knows whether these 14 bytes are located in an otherwise unused cache line aligned buffer.
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/**
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* @file
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*
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* @ingroup rtems_bsd_rtems
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*
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* @brief TODO.
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*
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* File origin from FreeBSD "sys/powerpc/powerpc/busdma_machdep.c".
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*/
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/*-
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* Copyright (c) 2012 embedded brains GmbH.
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* All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* Copyright (c) 1997, 1998 Justin T. Gibbs.
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/rtems-bsd-kernel-space.h>
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#include <machine/rtems-bsd-bus-dma.h>
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#include <sys/mbuf.h>
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/*
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* Like bus_dmamap_load(), but for mbufs.
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*/
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int
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bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
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struct mbuf *m0,
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bus_dmamap_callback2_t *callback, void *callback_arg,
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int flags)
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{
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bus_dma_segment_t dm_segments[dmat->nsegments];
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int nsegs, error;
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M_ASSERTPKTHDR(m0);
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flags |= BUS_DMA_NOWAIT;
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nsegs = 0;
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error = 0;
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if (m0->m_pkthdr.len <= dmat->maxsize) {
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int first = 1;
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bus_addr_t lastaddr = 0;
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struct mbuf *m;
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if ((flags & BUS_DMA_LOAD_MBUF) != 0) {
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map->flags |= DMAMAP_CACHE_ALIGNED;
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}
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for (m = m0; m != NULL && error == 0; m = m->m_next) {
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if (m->m_len > 0) {
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error = bus_dmamap_load_buffer(dmat, dm_segments,
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m->m_data, m->m_len,
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NULL, flags, &lastaddr,
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&nsegs, first);
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first = 0;
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}
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}
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} else {
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error = EINVAL;
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}
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if (error) {
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/* force "no valid mappings" in callback */
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(*callback)(callback_arg, dm_segments, 0, 0, error);
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} else {
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(*callback)(callback_arg, dm_segments,
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nsegs+1, m0->m_pkthdr.len, error);
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}
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return (error);
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}
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int
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bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
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struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs,
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int flags)
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{
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int error;
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M_ASSERTPKTHDR(m0);
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flags |= BUS_DMA_NOWAIT;
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*nsegs = 0;
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error = 0;
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if (m0->m_pkthdr.len <= dmat->maxsize) {
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int first = 1;
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bus_addr_t lastaddr = 0;
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struct mbuf *m;
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for (m = m0; m != NULL && error == 0; m = m->m_next) {
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if (m->m_len > 0) {
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error = bus_dmamap_load_buffer(dmat, segs,
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m->m_data, m->m_len,
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NULL, flags, &lastaddr,
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nsegs, first);
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first = 0;
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}
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}
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} else {
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error = EINVAL;
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}
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/* XXX FIXME: Having to increment nsegs is really annoying */
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++*nsegs;
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return (error);
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}
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