3f9d41ed10
busdma implementations to coexist. Copy busdma_machdep.c to busdma_bounce.c, which is still a single implementation of the busdma interface on x86 for now. The busdma_machdep.c only contains common and dispatch code. Tested by: pho (as part of the larger patch) Sponsored by: The FreeBSD Foundation MFC after: 1 month
360 lines
10 KiB
C
360 lines
10 KiB
C
/*-
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* Copyright (c) 1997, 1998 Justin T. Gibbs.
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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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 <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/malloc.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/memdesc.h>
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#include <sys/mutex.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include <x86/include/busdma_impl.h>
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/*
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* Convenience function for manipulating driver locks from busdma (during
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* busdma_swi, for example). Drivers that don't provide their own locks
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* should specify &Giant to dmat->lockfuncarg. Drivers that use their own
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* non-mutex locking scheme don't have to use this at all.
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*/
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void
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busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
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{
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struct mtx *dmtx;
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dmtx = (struct mtx *)arg;
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switch (op) {
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case BUS_DMA_LOCK:
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mtx_lock(dmtx);
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break;
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case BUS_DMA_UNLOCK:
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mtx_unlock(dmtx);
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break;
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default:
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panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
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}
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}
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/*
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* dflt_lock should never get called. It gets put into the dma tag when
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* lockfunc == NULL, which is only valid if the maps that are associated
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* with the tag are meant to never be defered.
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* XXX Should have a way to identify which driver is responsible here.
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*/
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void
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bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op)
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{
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panic("driver error: busdma dflt_lock called");
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}
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/*
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* Return true if a match is made.
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*
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* To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
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*
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* If paddr is within the bounds of the dma tag then call the filter callback
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* to check for a match, if there is no filter callback then assume a match.
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*/
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int
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bus_dma_run_filter(struct bus_dma_tag_common *tc, bus_addr_t paddr)
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{
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int retval;
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retval = 0;
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do {
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if (((paddr > tc->lowaddr && paddr <= tc->highaddr) ||
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((paddr & (tc->alignment - 1)) != 0)) &&
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(tc->filter == NULL ||
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(*tc->filter)(tc->filterarg, paddr) != 0))
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retval = 1;
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tc = tc->parent;
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} while (retval == 0 && tc != NULL);
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return (retval);
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}
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int
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common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
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bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
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bus_addr_t highaddr, bus_dma_filter_t *filter, void *filterarg,
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bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags,
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bus_dma_lock_t *lockfunc, void *lockfuncarg, size_t sz, void **dmat)
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{
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void *newtag;
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struct bus_dma_tag_common *common;
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KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz"));
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/* Basic sanity checking */
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if (boundary != 0 && boundary < maxsegsz)
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maxsegsz = boundary;
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if (maxsegsz == 0)
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return (EINVAL);
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/* Return a NULL tag on failure */
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*dmat = NULL;
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newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT);
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if (newtag == NULL) {
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CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
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__func__, newtag, 0, ENOMEM);
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return (ENOMEM);
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}
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common = newtag;
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common->impl = &bus_dma_bounce_impl;
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common->parent = parent;
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common->alignment = alignment;
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common->boundary = boundary;
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common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
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common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
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common->filter = filter;
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common->filterarg = filterarg;
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common->maxsize = maxsize;
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common->nsegments = nsegments;
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common->maxsegsz = maxsegsz;
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common->flags = flags;
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common->ref_count = 1; /* Count ourself */
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if (lockfunc != NULL) {
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common->lockfunc = lockfunc;
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common->lockfuncarg = lockfuncarg;
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} else {
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common->lockfunc = bus_dma_dflt_lock;
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common->lockfuncarg = NULL;
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}
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/* Take into account any restrictions imposed by our parent tag */
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if (parent != NULL) {
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common->impl = parent->impl;
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common->lowaddr = MIN(parent->lowaddr, common->lowaddr);
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common->highaddr = MAX(parent->highaddr, common->highaddr);
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if (common->boundary == 0)
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common->boundary = parent->boundary;
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else if (parent->boundary != 0) {
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common->boundary = MIN(parent->boundary,
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common->boundary);
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}
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if (common->filter == NULL) {
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/*
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* Short circuit looking at our parent directly
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* since we have encapsulated all of its information
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*/
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common->filter = parent->filter;
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common->filterarg = parent->filterarg;
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common->parent = parent->parent;
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}
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atomic_add_int(&parent->ref_count, 1);
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}
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*dmat = common;
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return (0);
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}
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/*
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* Allocate a device specific dma_tag.
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*/
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int
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bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
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bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
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bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
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int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
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void *lockfuncarg, bus_dma_tag_t *dmat)
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{
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struct bus_dma_tag_common *tc;
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int error;
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if (parent == NULL) {
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error = bus_dma_bounce_impl.tag_create(parent, alignment,
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boundary, lowaddr, highaddr, filter, filterarg, maxsize,
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nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
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} else {
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tc = (struct bus_dma_tag_common *)parent;
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error = tc->impl->tag_create(parent, alignment,
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boundary, lowaddr, highaddr, filter, filterarg, maxsize,
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nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
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}
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return (error);
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}
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int
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bus_dma_tag_destroy(bus_dma_tag_t dmat)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->tag_destroy(dmat));
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}
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/*
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* Allocate a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int
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bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->map_create(dmat, flags, mapp));
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}
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/*
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* Destroy a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int
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bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->map_destroy(dmat, map));
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}
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/*
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* Allocate a piece of memory that can be efficiently mapped into
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* bus device space based on the constraints lited in the dma tag.
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* A dmamap to for use with dmamap_load is also allocated.
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*/
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int
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bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
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bus_dmamap_t *mapp)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->mem_alloc(dmat, vaddr, flags, mapp));
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}
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/*
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* Free a piece of memory and it's allociated dmamap, that was allocated
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* via bus_dmamem_alloc. Make the same choice for free/contigfree.
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*/
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void
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bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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tc->impl->mem_free(dmat, vaddr, map);
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}
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/*
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* Utility function to load a physical buffer. segp contains
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* the starting segment on entrace, and the ending segment on exit.
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*/
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int
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_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
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bus_size_t buflen, int flags, bus_dma_segment_t *segs, int *segp)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->load_phys(dmat, map, buf, buflen, flags, segs,
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segp));
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}
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int
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_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, struct vm_page **ma,
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bus_size_t tlen, int ma_offs, int flags, bus_dma_segment_t *segs,
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int *segp)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->load_ma(dmat, map, ma, tlen, ma_offs, flags,
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segs, segp));
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}
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/*
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* Utility function to load a linear buffer. segp contains
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* the starting segment on entrace, and the ending segment on exit.
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*/
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int
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_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
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bus_size_t buflen, pmap_t pmap, int flags, bus_dma_segment_t *segs,
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int *segp)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->load_buffer(dmat, map, buf, buflen, pmap, flags, segs,
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segp));
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}
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void
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__bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
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struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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tc->impl->map_waitok(dmat, map, mem, callback, callback_arg);
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}
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bus_dma_segment_t *
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_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
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bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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return (tc->impl->map_complete(dmat, map, segs, nsegs, error));
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}
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/*
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* Release the mapping held by map.
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*/
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void
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_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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tc->impl->map_unload(dmat, map);
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}
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void
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_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
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{
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struct bus_dma_tag_common *tc;
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tc = (struct bus_dma_tag_common *)dmat;
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tc->impl->map_sync(dmat, map, op);
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}
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