FreeBSD/Linux Kernel Cross Reference
sys/x86/include/bus_dma.h

     /*-
      * Copyright (c) 2017 Jason A. Harmening.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/x86/include/bus_dma.h 320528 2017-07-01 05:35:29Z jah $
     */
    
    #ifndef _X86_BUS_DMA_H_
    #define _X86_BUS_DMA_H_
    
    #define WANT_INLINE_DMAMAP
    #include <sys/bus_dma.h>
    #include <sys/_null.h>
    
    #include <x86/busdma_impl.h>
    
    /*
     * Allocate a handle for mapping from kva/uva/physical
     * address space into bus device space.
     */
    static inline int
    bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
    {
            struct bus_dma_tag_common *tc;
    
            tc = (struct bus_dma_tag_common *)dmat;
            return (tc->impl->map_create(dmat, flags, mapp));
    }
    
    /*
     * Destroy a handle for mapping from kva/uva/physical
     * address space into bus device space.
     */
    static inline int
    bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
    {
            struct bus_dma_tag_common *tc;
    
            tc = (struct bus_dma_tag_common *)dmat;
            return (tc->impl->map_destroy(dmat, map));
    }
    
    /*
     * Allocate a piece of memory that can be efficiently mapped into
     * bus device space based on the constraints lited in the dma tag.
     * A dmamap to for use with dmamap_load is also allocated.
     */
    static inline int
    bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
        bus_dmamap_t *mapp)
    {
            struct bus_dma_tag_common *tc;
    
            tc = (struct bus_dma_tag_common *)dmat;
            return (tc->impl->mem_alloc(dmat, vaddr, flags, mapp));
    }
    
    /*
     * Free a piece of memory and it's allociated dmamap, that was allocated
     * via bus_dmamem_alloc.  Make the same choice for free/contigfree.
     */
    static inline void
    bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
    {
            struct bus_dma_tag_common *tc;
    
            tc = (struct bus_dma_tag_common *)dmat;
            tc->impl->mem_free(dmat, vaddr, map);
    }
    
    /*
     * Release the mapping held by map.
     */
    static inline void
    bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
    {
            struct bus_dma_tag_common *tc;
    
           if (map != NULL) {
                   tc = (struct bus_dma_tag_common *)dmat;
                   tc->impl->map_unload(dmat, map);
           }
   }
   
   static inline void
   bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
   {
           struct bus_dma_tag_common *tc;
   
           if (map != NULL) {
                   tc = (struct bus_dma_tag_common *)dmat;
                   tc->impl->map_sync(dmat, map, op);
           }
   }
   
   /*
    * Utility function to load a physical buffer.  segp contains
    * the starting segment on entrace, and the ending segment on exit.
    */
   static inline int
   _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
       bus_size_t buflen, int flags, bus_dma_segment_t *segs, int *segp)
   {
           struct bus_dma_tag_common *tc;
   
           tc = (struct bus_dma_tag_common *)dmat;
           return (tc->impl->load_phys(dmat, map, buf, buflen, flags, segs,
               segp));
   }
   
   static inline int
   _bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, struct vm_page **ma,
       bus_size_t tlen, int ma_offs, int flags, bus_dma_segment_t *segs,
       int *segp)
   {
           struct bus_dma_tag_common *tc;
   
           tc = (struct bus_dma_tag_common *)dmat;
           return (tc->impl->load_ma(dmat, map, ma, tlen, ma_offs, flags,
               segs, segp));
   }
   
   /*
    * Utility function to load a linear buffer.  segp contains
    * the starting segment on entrace, and the ending segment on exit.
    */
   static inline int
   _bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
       bus_size_t buflen, struct pmap *pmap, int flags, bus_dma_segment_t *segs,
       int *segp)
   {
           struct bus_dma_tag_common *tc;
   
           tc = (struct bus_dma_tag_common *)dmat;
           return (tc->impl->load_buffer(dmat, map, buf, buflen, pmap, flags, segs,
               segp));
   }
   
   static inline void
   _bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
       struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
   {
           struct bus_dma_tag_common *tc;
   
           if (map != NULL) {
                   tc = (struct bus_dma_tag_common *)dmat;
                   tc->impl->map_waitok(dmat, map, mem, callback, callback_arg);
           }
   }
   
   static inline bus_dma_segment_t *
   _bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
       bus_dma_segment_t *segs, int nsegs, int error)
   {
           struct bus_dma_tag_common *tc;
   
           tc = (struct bus_dma_tag_common *)dmat;
           return (tc->impl->map_complete(dmat, map, segs, nsegs, error));
   }
   
   #endif /* !_X86_BUS_DMA_H_ */
   

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