HardenedBSD/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.
 *
 * $FreeBSD$
 */

#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_ */