2 * Copyright (c) 1997, 1998 Justin T. Gibbs.
3 * Copyright (c) 2013, 2015 The FreeBSD Foundation
6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
7 * under sponsorship from the FreeBSD Foundation.
9 * Portions of this software were developed by Semihalf
10 * under sponsorship of the FreeBSD Foundation.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification, immediately at the beginning of the file.
18 * 2. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/kernel.h>
44 #include <sys/memdesc.h>
45 #include <sys/mutex.h>
48 #include <vm/vm_extern.h>
51 #include <machine/bus.h>
52 #include <machine/bus_dma_impl.h>
55 * Return true if a match is made.
57 * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
59 * If paddr is within the bounds of the dma tag then call the filter callback
60 * to check for a match, if there is no filter callback then assume a match.
63 bus_dma_run_filter(struct bus_dma_tag_common *tc, bus_addr_t paddr)
69 if (((paddr > tc->lowaddr && paddr <= tc->highaddr) ||
70 !vm_addr_align_ok(paddr, tc->alignment)) &&
71 (tc->filter == NULL ||
72 (*tc->filter)(tc->filterarg, paddr) != 0))
76 } while (retval == 0 && tc != NULL);
81 common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
82 bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
83 bus_addr_t highaddr, bus_dma_filter_t *filter, void *filterarg,
84 bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags,
85 bus_dma_lock_t *lockfunc, void *lockfuncarg, size_t sz, void **dmat)
88 struct bus_dma_tag_common *common;
90 KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz"));
91 /* Return a NULL tag on failure */
93 /* Basic sanity checking */
94 if (boundary != 0 && boundary < maxsegsz)
99 newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT);
100 if (newtag == NULL) {
101 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
102 __func__, newtag, 0, ENOMEM);
107 common->impl = &bus_dma_bounce_impl;
108 common->parent = parent;
109 common->alignment = alignment;
110 common->boundary = boundary;
111 common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
112 common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
113 common->filter = filter;
114 common->filterarg = filterarg;
115 common->maxsize = maxsize;
116 common->nsegments = nsegments;
117 common->maxsegsz = maxsegsz;
118 common->flags = flags;
119 common->ref_count = 1; /* Count ourself */
120 if (lockfunc != NULL) {
121 common->lockfunc = lockfunc;
122 common->lockfuncarg = lockfuncarg;
124 common->lockfunc = _busdma_dflt_lock;
125 common->lockfuncarg = NULL;
128 /* Take into account any restrictions imposed by our parent tag */
129 if (parent != NULL) {
130 common->impl = parent->impl;
131 common->lowaddr = MIN(parent->lowaddr, common->lowaddr);
132 common->highaddr = MAX(parent->highaddr, common->highaddr);
133 if (common->boundary == 0)
134 common->boundary = parent->boundary;
135 else if (parent->boundary != 0) {
136 common->boundary = MIN(parent->boundary,
139 if (common->filter == NULL) {
141 * Short circuit looking at our parent directly
142 * since we have encapsulated all of its information
144 common->filter = parent->filter;
145 common->filterarg = parent->filterarg;
146 common->parent = parent->parent;
148 atomic_add_int(&parent->ref_count, 1);
155 * Allocate a device specific dma_tag.
158 bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
159 bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
160 bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
161 int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
162 void *lockfuncarg, bus_dma_tag_t *dmat)
164 struct bus_dma_tag_common *tc;
167 if (parent == NULL) {
168 error = bus_dma_bounce_impl.tag_create(parent, alignment,
169 boundary, lowaddr, highaddr, filter, filterarg, maxsize,
170 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
172 tc = (struct bus_dma_tag_common *)parent;
173 error = tc->impl->tag_create(parent, alignment,
174 boundary, lowaddr, highaddr, filter, filterarg, maxsize,
175 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
181 bus_dma_template_clone(bus_dma_template_t *t, bus_dma_tag_t dmat)
183 struct bus_dma_tag_common *common;
185 if (t == NULL || dmat == NULL)
188 common = (struct bus_dma_tag_common *)dmat;
190 t->parent = (bus_dma_tag_t)common->parent;
191 t->alignment = common->alignment;
192 t->boundary = common->boundary;
193 t->lowaddr = common->lowaddr;
194 t->highaddr = common->highaddr;
195 t->maxsize = common->maxsize;
196 t->nsegments = common->nsegments;
197 t->maxsegsize = common->maxsegsz;
198 t->flags = common->flags;
199 t->lockfunc = common->lockfunc;
200 t->lockfuncarg = common->lockfuncarg;
204 bus_dma_tag_destroy(bus_dma_tag_t dmat)
206 struct bus_dma_tag_common *tc;
208 tc = (struct bus_dma_tag_common *)dmat;
209 return (tc->impl->tag_destroy(dmat));
213 bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain)