d8313c45a6
MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D6499
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*-
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* Copyright (c) 2016 Microsoft Corp.
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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 unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <dev/hyperv/include/hyperv_busdma.h>
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#define HYPERV_DMA_MASK (BUS_DMA_WAITOK | BUS_DMA_NOWAIT | BUS_DMA_ZERO)
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void
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hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
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{
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bus_addr_t *paddr = arg;
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if (error)
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return;
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KASSERT(nseg == 1, ("too many segments %d!", nseg));
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*paddr = segs->ds_addr;
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}
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void *
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hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag, bus_size_t alignment,
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bus_addr_t boundary, bus_size_t size, struct hyperv_dma *dma, int flags)
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{
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void *ret;
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int error;
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error = bus_dma_tag_create(parent_dtag, /* parent */
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alignment, /* alignment */
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boundary, /* 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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size, /* maxsize */
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1, /* nsegments */
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size, /* maxsegsize */
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0, /* flags */
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NULL, /* lockfunc */
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NULL, /* lockfuncarg */
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&dma->hv_dtag);
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if (error)
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return NULL;
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error = bus_dmamem_alloc(dma->hv_dtag, &ret,
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(flags & HYPERV_DMA_MASK) | BUS_DMA_COHERENT, &dma->hv_dmap);
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if (error) {
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bus_dma_tag_destroy(dma->hv_dtag);
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return NULL;
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}
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error = bus_dmamap_load(dma->hv_dtag, dma->hv_dmap, ret, size,
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hyperv_dma_map_paddr, &dma->hv_paddr, BUS_DMA_NOWAIT);
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if (error) {
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bus_dmamem_free(dma->hv_dtag, ret, dma->hv_dmap);
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bus_dma_tag_destroy(dma->hv_dtag);
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return NULL;
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}
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return ret;
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}
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void
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hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr)
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{
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bus_dmamap_unload(dma->hv_dtag, dma->hv_dmap);
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bus_dmamem_free(dma->hv_dtag, ptr, dma->hv_dmap);
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bus_dma_tag_destroy(dma->hv_dtag);
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}
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