hyperv_busdma.c

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    1 /*-
    2  * Copyright (c) 2016 Microsoft Corp.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 
   34 #include <machine/bus.h>
   35 
   36 #include <dev/hyperv/include/hyperv_busdma.h>
   37 
   38 #define HYPERV_DMA_MASK (BUS_DMA_WAITOK | BUS_DMA_NOWAIT | BUS_DMA_ZERO)
   39 
   40 void
   41 hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   42 {
   43         bus_addr_t *paddr = arg;
   44 
   45         if (error)
   46                 return;
   47 
   48         KASSERT(nseg == 1, ("too many segments %d!", nseg));
   49         *paddr = segs->ds_addr;
   50 }
   51 
   52 void *
   53 hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag, bus_size_t alignment,
   54     bus_addr_t boundary, bus_size_t size, struct hyperv_dma *dma, int flags)
   55 {
   56         void *ret;
   57         int error;
   58 
   59         error = bus_dma_tag_create(parent_dtag, /* parent */
   60             alignment,          /* alignment */
   61             boundary,           /* boundary */
   62             BUS_SPACE_MAXADDR,  /* lowaddr */
   63             BUS_SPACE_MAXADDR,  /* highaddr */
   64             NULL, NULL,         /* filter, filterarg */
   65             size,               /* maxsize */
   66             1,                  /* nsegments */
   67             size,               /* maxsegsize */
   68             0,                  /* flags */
   69             NULL,               /* lockfunc */
   70             NULL,               /* lockfuncarg */
   71             &dma->hv_dtag);
   72         if (error)
   73                 return NULL;
   74 
   75         error = bus_dmamem_alloc(dma->hv_dtag, &ret,
   76             (flags & HYPERV_DMA_MASK) | BUS_DMA_COHERENT, &dma->hv_dmap);
   77         if (error) {
   78                 bus_dma_tag_destroy(dma->hv_dtag);
   79                 return NULL;
   80         }
   81 
   82         error = bus_dmamap_load(dma->hv_dtag, dma->hv_dmap, ret, size,
   83             hyperv_dma_map_paddr, &dma->hv_paddr, BUS_DMA_NOWAIT);
   84         if (error) {
   85                 bus_dmamem_free(dma->hv_dtag, ret, dma->hv_dmap);
   86                 bus_dma_tag_destroy(dma->hv_dtag);
   87                 return NULL;
   88         }
   89         return ret;
   90 }
   91 
   92 void
   93 hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr)
   94 {
   95         bus_dmamap_unload(dma->hv_dtag, dma->hv_dmap);
   96         bus_dmamem_free(dma->hv_dtag, ptr, dma->hv_dmap);
   97         bus_dma_tag_destroy(dma->hv_dtag);
   98 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/hyperv/vmbus/hyperv_busdma.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/hyperv/vmbus/hyperv_busdma.c