2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1997, 1998 Justin T. Gibbs.
5 * Copyright (c) 2013 The FreeBSD Foundation
8 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
9 * under sponsorship from the FreeBSD Foundation.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification, immediately at the beginning of the file.
17 * 2. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/kernel.h>
45 #include <sys/memdesc.h>
46 #include <sys/mutex.h>
48 #include <sys/vmmeter.h>
50 #include <vm/vm_extern.h>
51 #include <vm/vm_param.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_phys.h>
55 #include <machine/bus.h>
56 #include <x86/include/busdma_impl.h>
59 * Convenience function for manipulating driver locks from busdma (during
60 * busdma_swi, for example). Drivers that don't provide their own locks
61 * should specify &Giant to dmat->lockfuncarg. Drivers that use their own
62 * non-mutex locking scheme don't have to use this at all.
65 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
69 dmtx = (struct mtx *)arg;
78 panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
83 * dflt_lock should never get called. It gets put into the dma tag when
84 * lockfunc == NULL, which is only valid if the maps that are associated
85 * with the tag are meant to never be defered.
86 * XXX Should have a way to identify which driver is responsible here.
89 bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op)
92 panic("driver error: busdma dflt_lock called");
96 * Return true if a match is made.
98 * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
100 * If paddr is within the bounds of the dma tag then call the filter callback
101 * to check for a match, if there is no filter callback then assume a match.
104 bus_dma_run_filter(struct bus_dma_tag_common *tc, vm_paddr_t paddr)
110 if ((paddr >= BUS_SPACE_MAXADDR ||
111 (paddr > tc->lowaddr && paddr <= tc->highaddr) ||
112 (paddr & (tc->alignment - 1)) != 0) &&
113 (tc->filter == NULL ||
114 (*tc->filter)(tc->filterarg, paddr) != 0))
118 } while (retval == 0 && tc != NULL);
123 common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
124 bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
125 bus_addr_t highaddr, bus_dma_filter_t *filter, void *filterarg,
126 bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags,
127 bus_dma_lock_t *lockfunc, void *lockfuncarg, size_t sz, void **dmat)
130 struct bus_dma_tag_common *common;
132 KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz"));
133 /* Basic sanity checking */
134 if (boundary != 0 && boundary < maxsegsz)
138 /* Return a NULL tag on failure */
141 newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT);
142 if (newtag == NULL) {
143 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
144 __func__, newtag, 0, ENOMEM);
149 common->impl = &bus_dma_bounce_impl;
150 common->parent = parent;
151 common->alignment = alignment;
152 common->boundary = boundary;
153 common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
154 common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
155 common->filter = filter;
156 common->filterarg = filterarg;
157 common->maxsize = maxsize;
158 common->nsegments = nsegments;
159 common->maxsegsz = maxsegsz;
160 common->flags = flags;
161 common->ref_count = 1; /* Count ourself */
162 if (lockfunc != NULL) {
163 common->lockfunc = lockfunc;
164 common->lockfuncarg = lockfuncarg;
166 common->lockfunc = bus_dma_dflt_lock;
167 common->lockfuncarg = NULL;
170 /* Take into account any restrictions imposed by our parent tag */
171 if (parent != NULL) {
172 common->impl = parent->impl;
173 common->lowaddr = MIN(parent->lowaddr, common->lowaddr);
174 common->highaddr = MAX(parent->highaddr, common->highaddr);
175 if (common->boundary == 0)
176 common->boundary = parent->boundary;
177 else if (parent->boundary != 0) {
178 common->boundary = MIN(parent->boundary,
181 if (common->filter == NULL) {
183 * Short circuit looking at our parent directly
184 * since we have encapsulated all of its information
186 common->filter = parent->filter;
187 common->filterarg = parent->filterarg;
188 common->parent = parent->parent;
190 common->domain = parent->domain;
191 atomic_add_int(&parent->ref_count, 1);
193 common->domain = vm_phys_domain_match(common->domain, 0ul,
200 bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain)
202 struct bus_dma_tag_common *tc;
204 tc = (struct bus_dma_tag_common *)dmat;
205 domain = vm_phys_domain_match(domain, 0ul, tc->lowaddr);
206 /* Only call the callback if it changes. */
207 if (domain == tc->domain)
210 return (tc->impl->tag_set_domain(dmat));
214 * Allocate a device specific dma_tag.
217 bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
218 bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
219 bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
220 int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
221 void *lockfuncarg, bus_dma_tag_t *dmat)
223 struct bus_dma_tag_common *tc;
226 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "%s", __func__);
228 if (parent == NULL) {
229 error = bus_dma_bounce_impl.tag_create(parent, alignment,
230 boundary, lowaddr, highaddr, filter, filterarg, maxsize,
231 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
233 tc = (struct bus_dma_tag_common *)parent;
234 error = tc->impl->tag_create(parent, alignment,
235 boundary, lowaddr, highaddr, filter, filterarg, maxsize,
236 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat);
242 bus_dma_tag_destroy(bus_dma_tag_t dmat)
244 struct bus_dma_tag_common *tc;
246 tc = (struct bus_dma_tag_common *)dmat;
247 return (tc->impl->tag_destroy(dmat));
252 bus_dma_dmar_set_buswide(device_t dev)