1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997, 1998 Justin T. Gibbs. 5 * Copyright (c) 2013 The FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 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. 19 * 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 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/bus.h> 40 #include <sys/kernel.h> 41 #include <sys/ktr.h> 42 #include <sys/lock.h> 43 #include <sys/memdesc.h> 44 #include <sys/mutex.h> 45 #include <sys/uio.h> 46 #include <sys/vmmeter.h> 47 #include <vm/vm.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_param.h> 50 #include <vm/vm_page.h> 51 #include <vm/vm_phys.h> 52 #include <vm/pmap.h> 53 #include <machine/bus.h> 54 #include <x86/include/busdma_impl.h> 55 56 /* 57 * Convenience function for manipulating driver locks from busdma (during 58 * busdma_swi, for example). Drivers that don't provide their own locks 59 * should specify &Giant to dmat->lockfuncarg. Drivers that use their own 60 * non-mutex locking scheme don't have to use this at all. 61 */ 62 void 63 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op) 64 { 65 struct mtx *dmtx; 66 67 dmtx = (struct mtx *)arg; 68 switch (op) { 69 case BUS_DMA_LOCK: 70 mtx_lock(dmtx); 71 break; 72 case BUS_DMA_UNLOCK: 73 mtx_unlock(dmtx); 74 break; 75 default: 76 panic("Unknown operation 0x%x for busdma_lock_mutex!", op); 77 } 78 } 79 80 /* 81 * dflt_lock should never get called. It gets put into the dma tag when 82 * lockfunc == NULL, which is only valid if the maps that are associated 83 * with the tag are meant to never be defered. 84 * XXX Should have a way to identify which driver is responsible here. 85 */ 86 void 87 bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op) 88 { 89 90 panic("driver error: busdma dflt_lock called"); 91 } 92 93 /* 94 * Return true if a match is made. 95 * 96 * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'. 97 * 98 * If paddr is within the bounds of the dma tag then call the filter callback 99 * to check for a match, if there is no filter callback then assume a match. 100 */ 101 int 102 bus_dma_run_filter(struct bus_dma_tag_common *tc, bus_addr_t paddr) 103 { 104 int retval; 105 106 retval = 0; 107 do { 108 if (((paddr > tc->lowaddr && paddr <= tc->highaddr) || 109 ((paddr & (tc->alignment - 1)) != 0)) && 110 (tc->filter == NULL || 111 (*tc->filter)(tc->filterarg, paddr) != 0)) 112 retval = 1; 113 114 tc = tc->parent; 115 } while (retval == 0 && tc != NULL); 116 return (retval); 117 } 118 119 int 120 common_bus_dma_tag_create(struct bus_dma_tag_common *parent, 121 bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr, 122 bus_addr_t highaddr, bus_dma_filter_t *filter, void *filterarg, 123 bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags, 124 bus_dma_lock_t *lockfunc, void *lockfuncarg, size_t sz, void **dmat) 125 { 126 void *newtag; 127 struct bus_dma_tag_common *common; 128 129 KASSERT(sz >= sizeof(struct bus_dma_tag_common), ("sz")); 130 /* Basic sanity checking */ 131 if (boundary != 0 && boundary < maxsegsz) 132 maxsegsz = boundary; 133 if (maxsegsz == 0) 134 return (EINVAL); 135 /* Return a NULL tag on failure */ 136 *dmat = NULL; 137 138 newtag = malloc(sz, M_DEVBUF, M_ZERO | M_NOWAIT); 139 if (newtag == NULL) { 140 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 141 __func__, newtag, 0, ENOMEM); 142 return (ENOMEM); 143 } 144 145 common = newtag; 146 common->impl = &bus_dma_bounce_impl; 147 common->parent = parent; 148 common->alignment = alignment; 149 common->boundary = boundary; 150 common->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1); 151 common->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1); 152 common->filter = filter; 153 common->filterarg = filterarg; 154 common->maxsize = maxsize; 155 common->nsegments = nsegments; 156 common->maxsegsz = maxsegsz; 157 common->flags = flags; 158 common->ref_count = 1; /* Count ourself */ 159 if (lockfunc != NULL) { 160 common->lockfunc = lockfunc; 161 common->lockfuncarg = lockfuncarg; 162 } else { 163 common->lockfunc = bus_dma_dflt_lock; 164 common->lockfuncarg = NULL; 165 } 166 167 /* Take into account any restrictions imposed by our parent tag */ 168 if (parent != NULL) { 169 common->impl = parent->impl; 170 common->lowaddr = MIN(parent->lowaddr, common->lowaddr); 171 common->highaddr = MAX(parent->highaddr, common->highaddr); 172 if (common->boundary == 0) 173 common->boundary = parent->boundary; 174 else if (parent->boundary != 0) { 175 common->boundary = MIN(parent->boundary, 176 common->boundary); 177 } 178 if (common->filter == NULL) { 179 /* 180 * Short circuit looking at our parent directly 181 * since we have encapsulated all of its information 182 */ 183 common->filter = parent->filter; 184 common->filterarg = parent->filterarg; 185 common->parent = parent->parent; 186 } 187 common->domain = parent->domain; 188 atomic_add_int(&parent->ref_count, 1); 189 } 190 common->domain = vm_phys_domain_match(common->domain, 0ul, 191 common->lowaddr); 192 *dmat = common; 193 return (0); 194 } 195 196 int 197 bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain) 198 { 199 struct bus_dma_tag_common *tc; 200 201 tc = (struct bus_dma_tag_common *)dmat; 202 domain = vm_phys_domain_match(domain, 0ul, tc->lowaddr); 203 /* Only call the callback if it changes. */ 204 if (domain == tc->domain) 205 return (0); 206 tc->domain = domain; 207 return (tc->impl->tag_set_domain(dmat)); 208 } 209 210 /* 211 * Allocate a device specific dma_tag. 212 */ 213 int 214 bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 215 bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr, 216 bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize, 217 int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 218 void *lockfuncarg, bus_dma_tag_t *dmat) 219 { 220 struct bus_dma_tag_common *tc; 221 int error; 222 223 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "%s", __func__); 224 225 if (parent == NULL) { 226 error = bus_dma_bounce_impl.tag_create(parent, alignment, 227 boundary, lowaddr, highaddr, filter, filterarg, maxsize, 228 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat); 229 } else { 230 tc = (struct bus_dma_tag_common *)parent; 231 error = tc->impl->tag_create(parent, alignment, 232 boundary, lowaddr, highaddr, filter, filterarg, maxsize, 233 nsegments, maxsegsz, flags, lockfunc, lockfuncarg, dmat); 234 } 235 return (error); 236 } 237 238 int 239 bus_dma_tag_destroy(bus_dma_tag_t dmat) 240 { 241 struct bus_dma_tag_common *tc; 242 243 tc = (struct bus_dma_tag_common *)dmat; 244 return (tc->impl->tag_destroy(dmat)); 245 } 246 247