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      1 /*	$NetBSD: bus_stubs.c,v 1.3 2021/09/18 09:49:57 jmcneill Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Maxime Villard.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: bus_stubs.c,v 1.3 2021/09/18 09:49:57 jmcneill Exp $");
     34 
     35 #include <sys/systm.h>
     36 #include <sys/asan.h>
     37 #include <sys/bus.h>
     38 #include <sys/bus_proto.h>
     39 
     40 bool
     41 bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2)
     42 {
     43 	if (t1 == t2) {
     44 		return true;
     45 	}
     46 
     47 	return t1 != NULL && t2 != NULL && t1->bs_cookie == t2->bs_cookie;
     48 }
     49 
     50 int
     51 bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments,
     52     bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp)
     53 {
     54 	return (*t->_dmamap_create)(t, size, nsegments, maxsegsz, boundary,
     55 	    flags, dmamp);
     56 }
     57 
     58 void
     59 bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t dmam)
     60 {
     61 	(*t->_dmamap_destroy)(t, dmam);
     62 }
     63 
     64 int
     65 bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t dmam, void *buf,
     66     bus_size_t buflen, struct proc *p, int flags)
     67 {
     68 	kasan_dma_load(dmam, buf, buflen, KASAN_DMA_LINEAR);
     69 	return (*t->_dmamap_load)(t, dmam, buf, buflen, p, flags);
     70 }
     71 
     72 int
     73 bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t dmam, struct mbuf *chain,
     74     int flags)
     75 {
     76 	kasan_dma_load(dmam, chain, 0, KASAN_DMA_MBUF);
     77 	return (*t->_dmamap_load_mbuf)(t, dmam, chain, flags);
     78 }
     79 
     80 int
     81 bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t dmam, struct uio *uio,
     82     int flags)
     83 {
     84 	kasan_dma_load(dmam, uio, 0, KASAN_DMA_UIO);
     85 	return (*t->_dmamap_load_uio)(t, dmam, uio, flags);
     86 }
     87 
     88 int
     89 bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t dmam, bus_dma_segment_t *segs,
     90     int nsegs, bus_size_t size, int flags)
     91 {
     92 	return (*t->_dmamap_load_raw)(t, dmam, segs, nsegs, size, flags);
     93 }
     94 
     95 void
     96 bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t dmam)
     97 {
     98 	(*t->_dmamap_unload)(t, dmam);
     99 }
    100 
    101 void
    102 bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t p, bus_addr_t o, bus_size_t l,
    103     int ops)
    104 {
    105 	kasan_dma_sync(p, o, l, ops);
    106 
    107 	if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 &&
    108 	    t->_dmamap_sync_pre != NULL)
    109 		(*t->_dmamap_sync_pre)(t, p, o, l, ops);
    110 	else if ((ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0 &&
    111 	    t->_dmamap_sync_post != NULL)
    112 		(*t->_dmamap_sync_post)(t, p, o, l, ops);
    113 }
    114