1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1997, 1998 Justin T. Gibbs. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions, and the following disclaimer, 12 * without modification, immediately at the beginning of the file. 13 * 2. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/domainset.h> 32#include <sys/malloc.h> 33#include <sys/bus.h> 34#include <sys/interrupt.h> 35#include <sys/kernel.h> 36#include <sys/ktr.h> 37#include <sys/lock.h> 38#include <sys/proc.h> 39#include <sys/memdesc.h> 40#include <sys/msan.h> 41#include <sys/mutex.h> 42#include <sys/sysctl.h> 43#include <sys/uio.h> 44 45#include <vm/vm.h> 46#include <vm/vm_extern.h> 47#include <vm/vm_kern.h> 48#include <vm/vm_page.h> 49#include <vm/vm_map.h> 50 51#include <machine/atomic.h> 52#include <machine/bus.h> 53#include <machine/md_var.h> 54#include <machine/specialreg.h> 55#include <x86/include/busdma_impl.h> 56 57#ifdef __i386__ 58#define MAX_BPAGES (Maxmem > atop(0x100000000ULL) ? 8192 : 512) 59#else 60#define MAX_BPAGES 8192 61#endif 62 63enum { 64 BUS_DMA_COULD_BOUNCE = 0x01, 65 BUS_DMA_MIN_ALLOC_COMP = 0x02, 66 BUS_DMA_KMEM_ALLOC = 0x04, 67 BUS_DMA_FORCE_MAP = 0x08, 68}; 69 70struct bounce_page; 71struct bounce_zone; 72 73struct bus_dma_tag { 74 struct bus_dma_tag_common common; 75 int map_count; 76 int bounce_flags; 77 bus_dma_segment_t *segments; 78 struct bounce_zone *bounce_zone; 79}; 80 81static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 82 "Busdma parameters"); 83 84struct bus_dmamap { 85 STAILQ_HEAD(, bounce_page) bpages; 86 int pagesneeded; 87 int pagesreserved; 88 bus_dma_tag_t dmat; 89 struct memdesc mem; 90 bus_dmamap_callback_t *callback; 91 void *callback_arg; 92 __sbintime_t queued_time; 93 STAILQ_ENTRY(bus_dmamap) links; 94#ifdef KMSAN 95 struct memdesc kmsan_mem; 96#endif 97}; 98 99static struct bus_dmamap nobounce_dmamap; 100 101static bool _bus_dmamap_pagesneeded(bus_dma_tag_t dmat, vm_paddr_t buf, 102 bus_size_t buflen, int *pagesneeded); 103static void _bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, 104 pmap_t pmap, void *buf, bus_size_t buflen, int flags); 105static void _bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, 106 vm_paddr_t buf, bus_size_t buflen, int flags); 107 108static MALLOC_DEFINE(M_BUSDMA, "busdma", "busdma metadata"); 109 110#define dmat_alignment(dmat) ((dmat)->common.alignment) 111#define dmat_bounce_flags(dmat) ((dmat)->bounce_flags) 112#define dmat_boundary(dmat) ((dmat)->common.boundary) 113#define dmat_domain(dmat) ((dmat)->common.domain) 114#define dmat_flags(dmat) ((dmat)->common.flags) 115#define dmat_highaddr(dmat) ((dmat)->common.highaddr) 116#define dmat_lowaddr(dmat) ((dmat)->common.lowaddr) 117#define dmat_lockfunc(dmat) ((dmat)->common.lockfunc) 118#define dmat_lockfuncarg(dmat) ((dmat)->common.lockfuncarg) 119#define dmat_maxsegsz(dmat) ((dmat)->common.maxsegsz) 120#define dmat_nsegments(dmat) ((dmat)->common.nsegments) 121 122#include "../../kern/subr_busdma_bounce.c" 123 124/* 125 * On i386 kernels without 'options PAE' we need to also bounce any 126 * physical addresses above 4G. 127 * 128 * NB: vm_paddr_t is required here since bus_addr_t is only 32 bits in 129 * i386 kernels without 'options PAE'. 130 */ 131static __inline bool 132must_bounce(bus_dma_tag_t dmat, vm_paddr_t paddr) 133{ 134#if defined(__i386__) && !defined(PAE) 135 if (paddr > BUS_SPACE_MAXADDR) 136 return (true); 137#endif 138 return (addr_needs_bounce(dmat, paddr)); 139} 140 141static int 142bounce_bus_dma_zone_setup(bus_dma_tag_t dmat) 143{ 144 struct bounce_zone *bz; 145 int error; 146 147 /* Must bounce */ 148 if ((error = alloc_bounce_zone(dmat)) != 0) 149 return (error); 150 bz = dmat->bounce_zone; 151 152 if (ptoa(bz->total_bpages) < dmat->common.maxsize) { 153 int pages; 154 155 pages = atop(dmat->common.maxsize) - bz->total_bpages; 156 157 /* Add pages to our bounce pool */ 158 if (alloc_bounce_pages(dmat, pages) < pages) 159 return (ENOMEM); 160 } 161 /* Performed initial allocation */ 162 dmat->bounce_flags |= BUS_DMA_MIN_ALLOC_COMP; 163 164 return (0); 165} 166 167/* 168 * Allocate a device specific dma_tag. 169 */ 170static int 171bounce_bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 172 bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr, 173 bus_size_t maxsize, int nsegments, bus_size_t maxsegsz, int flags, 174 bus_dma_lock_t *lockfunc, void *lockfuncarg, bus_dma_tag_t *dmat) 175{ 176 bus_dma_tag_t newtag; 177 int error; 178 179 *dmat = NULL; 180 error = common_bus_dma_tag_create(parent != NULL ? &parent->common : 181 NULL, alignment, boundary, lowaddr, highaddr, maxsize, nsegments, 182 maxsegsz, flags, lockfunc, lockfuncarg, sizeof(struct bus_dma_tag), 183 (void **)&newtag); 184 if (error != 0) 185 return (error); 186 187 newtag->common.impl = &bus_dma_bounce_impl; 188 newtag->map_count = 0; 189 newtag->segments = NULL; 190 191#ifdef KMSAN 192 /* 193 * When KMSAN is configured, we need a map to store a memory descriptor 194 * which can be used for validation. 195 */ 196 newtag->bounce_flags |= BUS_DMA_FORCE_MAP; 197#endif 198 199 if (parent != NULL && 200 (parent->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) 201 newtag->bounce_flags |= BUS_DMA_COULD_BOUNCE; 202 203 if (newtag->common.lowaddr < ptoa((vm_paddr_t)Maxmem) || 204 newtag->common.alignment > 1) 205 newtag->bounce_flags |= BUS_DMA_COULD_BOUNCE; 206 207 if ((newtag->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0 && 208 (flags & BUS_DMA_ALLOCNOW) != 0) 209 error = bounce_bus_dma_zone_setup(newtag); 210 else 211 error = 0; 212 213 if (error != 0) 214 free(newtag, M_DEVBUF); 215 else 216 *dmat = newtag; 217 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 218 __func__, newtag, (newtag != NULL ? newtag->common.flags : 0), 219 error); 220 return (error); 221} 222 223static bool 224bounce_bus_dma_id_mapped(bus_dma_tag_t dmat, vm_paddr_t buf, bus_size_t buflen) 225{ 226 227 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) == 0) 228 return (true); 229 return (!_bus_dmamap_pagesneeded(dmat, buf, buflen, NULL)); 230} 231 232/* 233 * Update the domain for the tag. We may need to reallocate the zone and 234 * bounce pages. 235 */ 236static int 237bounce_bus_dma_tag_set_domain(bus_dma_tag_t dmat) 238{ 239 240 KASSERT(dmat->map_count == 0, 241 ("bounce_bus_dma_tag_set_domain: Domain set after use.\n")); 242 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) == 0 || 243 dmat->bounce_zone == NULL) 244 return (0); 245 dmat->bounce_flags &= ~BUS_DMA_MIN_ALLOC_COMP; 246 return (bounce_bus_dma_zone_setup(dmat)); 247} 248 249static int 250bounce_bus_dma_tag_destroy(bus_dma_tag_t dmat) 251{ 252 int error = 0; 253 254 if (dmat != NULL) { 255 if (dmat->map_count != 0) { 256 error = EBUSY; 257 goto out; 258 } 259 if (dmat->segments != NULL) 260 free(dmat->segments, M_DEVBUF); 261 free(dmat, M_DEVBUF); 262 } 263out: 264 CTR3(KTR_BUSDMA, "%s tag %p error %d", __func__, dmat, error); 265 return (error); 266} 267 268/* 269 * Allocate a handle for mapping from kva/uva/physical 270 * address space into bus device space. 271 */ 272static int 273bounce_bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) 274{ 275 struct bounce_zone *bz; 276 int error, maxpages, pages; 277 278 error = 0; 279 280 if (dmat->segments == NULL) { 281 dmat->segments = malloc_domainset( 282 sizeof(bus_dma_segment_t) * dmat->common.nsegments, 283 M_DEVBUF, DOMAINSET_PREF(dmat->common.domain), M_NOWAIT); 284 if (dmat->segments == NULL) { 285 CTR3(KTR_BUSDMA, "%s: tag %p error %d", 286 __func__, dmat, ENOMEM); 287 return (ENOMEM); 288 } 289 } 290 291 if (dmat->bounce_flags & (BUS_DMA_COULD_BOUNCE | BUS_DMA_FORCE_MAP)) { 292 *mapp = malloc_domainset(sizeof(**mapp), M_DEVBUF, 293 DOMAINSET_PREF(dmat->common.domain), M_NOWAIT | M_ZERO); 294 if (*mapp == NULL) { 295 CTR3(KTR_BUSDMA, "%s: tag %p error %d", 296 __func__, dmat, ENOMEM); 297 return (ENOMEM); 298 } 299 STAILQ_INIT(&(*mapp)->bpages); 300 } else { 301 *mapp = NULL; 302 } 303 304 /* 305 * Bouncing might be required if the driver asks for an active 306 * exclusion region, a data alignment that is stricter than 1, and/or 307 * an active address boundary. 308 */ 309 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) { 310 /* Must bounce */ 311 if (dmat->bounce_zone == NULL && 312 (error = alloc_bounce_zone(dmat)) != 0) 313 goto out; 314 bz = dmat->bounce_zone; 315 316 /* 317 * Attempt to add pages to our pool on a per-instance 318 * basis up to a sane limit. 319 */ 320 if (dmat->common.alignment > 1) 321 maxpages = MAX_BPAGES; 322 else 323 maxpages = MIN(MAX_BPAGES, Maxmem - 324 atop(dmat->common.lowaddr)); 325 if ((dmat->bounce_flags & BUS_DMA_MIN_ALLOC_COMP) == 0 || 326 (bz->map_count > 0 && bz->total_bpages < maxpages)) { 327 pages = MAX(atop(dmat->common.maxsize), 1); 328 pages = MIN(dmat->common.nsegments, pages); 329 pages = MIN(maxpages - bz->total_bpages, pages); 330 pages = MAX(pages, 1); 331 if (alloc_bounce_pages(dmat, pages) < pages) 332 error = ENOMEM; 333 if ((dmat->bounce_flags & BUS_DMA_MIN_ALLOC_COMP) 334 == 0) { 335 if (error == 0) { 336 dmat->bounce_flags |= 337 BUS_DMA_MIN_ALLOC_COMP; 338 } 339 } else 340 error = 0; 341 } 342 bz->map_count++; 343 } 344 345out: 346 if (error == 0) { 347 dmat->map_count++; 348 } else { 349 free(*mapp, M_DEVBUF); 350 *mapp = NULL; 351 } 352 353 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 354 __func__, dmat, dmat->common.flags, error); 355 return (error); 356} 357 358/* 359 * Destroy a handle for mapping from kva/uva/physical 360 * address space into bus device space. 361 */ 362static int 363bounce_bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 364{ 365 366 if (map != NULL && map != &nobounce_dmamap) { 367 if (STAILQ_FIRST(&map->bpages) != NULL) { 368 CTR3(KTR_BUSDMA, "%s: tag %p error %d", 369 __func__, dmat, EBUSY); 370 return (EBUSY); 371 } 372 if (dmat->bounce_zone) 373 dmat->bounce_zone->map_count--; 374 free(map, M_DEVBUF); 375 } 376 dmat->map_count--; 377 CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat); 378 return (0); 379} 380 381/* 382 * Allocate a piece of memory that can be efficiently mapped into 383 * bus device space based on the constraints lited in the dma tag. 384 * A dmamap to for use with dmamap_load is also allocated. 385 */ 386static int 387bounce_bus_dmamem_alloc(bus_dma_tag_t dmat, void **vaddr, int flags, 388 bus_dmamap_t *mapp) 389{ 390 vm_memattr_t attr; 391 int mflags; 392 393 if (flags & BUS_DMA_NOWAIT) 394 mflags = M_NOWAIT; 395 else 396 mflags = M_WAITOK; 397 398 /* If we succeed, no mapping/bouncing will be required */ 399 *mapp = NULL; 400 401 if (dmat->segments == NULL) { 402 dmat->segments = (bus_dma_segment_t *)malloc_domainset( 403 sizeof(bus_dma_segment_t) * dmat->common.nsegments, 404 M_DEVBUF, DOMAINSET_PREF(dmat->common.domain), mflags); 405 if (dmat->segments == NULL) { 406 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 407 __func__, dmat, dmat->common.flags, ENOMEM); 408 return (ENOMEM); 409 } 410 } 411 if (flags & BUS_DMA_ZERO) 412 mflags |= M_ZERO; 413 if (flags & BUS_DMA_NOCACHE) 414 attr = VM_MEMATTR_UNCACHEABLE; 415 else 416 attr = VM_MEMATTR_DEFAULT; 417 418 /* 419 * Allocate the buffer from the malloc(9) allocator if... 420 * - It's small enough to fit into a single page. 421 * - Its alignment requirement is also smaller than the page size. 422 * - The low address requirement is fulfilled. 423 * - Default cache attributes are requested (WB). 424 * else allocate non-contiguous pages if... 425 * - The page count that could get allocated doesn't exceed 426 * nsegments also when the maximum segment size is less 427 * than PAGE_SIZE. 428 * - The alignment constraint isn't larger than a page boundary. 429 * - There are no boundary-crossing constraints. 430 * else allocate a block of contiguous pages because one or more of the 431 * constraints is something that only the contig allocator can fulfill. 432 * 433 * Warn the user if malloc gets it wrong. 434 */ 435 if (dmat->common.maxsize <= PAGE_SIZE && 436 dmat->common.alignment <= PAGE_SIZE && 437 dmat->common.lowaddr >= ptoa((vm_paddr_t)Maxmem) && 438 attr == VM_MEMATTR_DEFAULT) { 439 *vaddr = malloc_domainset_aligned(dmat->common.maxsize, 440 dmat->common.alignment, M_DEVBUF, 441 DOMAINSET_PREF(dmat->common.domain), mflags); 442 KASSERT(*vaddr == NULL || ((uintptr_t)*vaddr & PAGE_MASK) + 443 dmat->common.maxsize <= PAGE_SIZE, 444 ("bounce_bus_dmamem_alloc: multi-page alloc %p maxsize " 445 "%#jx align %#jx", *vaddr, (uintmax_t)dmat->common.maxsize, 446 (uintmax_t)dmat->common.alignment)); 447 } else if (dmat->common.nsegments >= 448 howmany(dmat->common.maxsize, MIN(dmat->common.maxsegsz, 449 PAGE_SIZE)) && 450 dmat->common.alignment <= PAGE_SIZE && 451 (dmat->common.boundary % PAGE_SIZE) == 0) { 452 /* Page-based multi-segment allocations allowed */ 453 *vaddr = kmem_alloc_attr_domainset( 454 DOMAINSET_PREF(dmat->common.domain), dmat->common.maxsize, 455 mflags, 0ul, dmat->common.lowaddr, attr); 456 dmat->bounce_flags |= BUS_DMA_KMEM_ALLOC; 457 } else { 458 *vaddr = kmem_alloc_contig_domainset( 459 DOMAINSET_PREF(dmat->common.domain), dmat->common.maxsize, 460 mflags, 0ul, dmat->common.lowaddr, 461 dmat->common.alignment != 0 ? dmat->common.alignment : 1ul, 462 dmat->common.boundary, attr); 463 dmat->bounce_flags |= BUS_DMA_KMEM_ALLOC; 464 } 465 if (*vaddr == NULL) { 466 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 467 __func__, dmat, dmat->common.flags, ENOMEM); 468 return (ENOMEM); 469 } else if (!vm_addr_align_ok(vtophys(*vaddr), dmat->common.alignment)) { 470 printf("bus_dmamem_alloc failed to align memory properly.\n"); 471 } 472 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 473 __func__, dmat, dmat->common.flags, 0); 474 return (0); 475} 476 477/* 478 * Free a piece of memory and its associated dmamap, that was allocated 479 * via bus_dmamem_alloc. Make the same choice for free/contigfree. 480 */ 481static void 482bounce_bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 483{ 484 /* 485 * dmamem does not need to be bounced, so the map should be 486 * NULL and the BUS_DMA_KMEM_ALLOC flag cleared if malloc() 487 * was used and set if kmem_alloc_contig() was used. 488 */ 489 if (map != NULL) 490 panic("bus_dmamem_free: Invalid map freed\n"); 491 if ((dmat->bounce_flags & BUS_DMA_KMEM_ALLOC) == 0) 492 free(vaddr, M_DEVBUF); 493 else 494 kmem_free(vaddr, dmat->common.maxsize); 495 CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, 496 dmat->bounce_flags); 497} 498 499static bool 500_bus_dmamap_pagesneeded(bus_dma_tag_t dmat, vm_paddr_t buf, bus_size_t buflen, 501 int *pagesneeded) 502{ 503 vm_paddr_t curaddr; 504 bus_size_t sgsize; 505 int count; 506 507 /* 508 * Count the number of bounce pages needed in order to 509 * complete this transfer 510 */ 511 count = 0; 512 curaddr = buf; 513 while (buflen != 0) { 514 sgsize = buflen; 515 if (must_bounce(dmat, curaddr)) { 516 sgsize = MIN(sgsize, 517 PAGE_SIZE - (curaddr & PAGE_MASK)); 518 if (pagesneeded == NULL) 519 return (true); 520 count++; 521 } 522 curaddr += sgsize; 523 buflen -= sgsize; 524 } 525 526 if (pagesneeded != NULL) 527 *pagesneeded = count; 528 return (count != 0); 529} 530 531static void 532_bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf, 533 bus_size_t buflen, int flags) 534{ 535 536 if (map != &nobounce_dmamap && map->pagesneeded == 0) { 537 _bus_dmamap_pagesneeded(dmat, buf, buflen, &map->pagesneeded); 538 CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); 539 } 540} 541 542static void 543_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap, 544 void *buf, bus_size_t buflen, int flags) 545{ 546 vm_offset_t vaddr; 547 vm_offset_t vendaddr; 548 vm_paddr_t paddr; 549 bus_size_t sg_len; 550 551 if (map != &nobounce_dmamap && map->pagesneeded == 0) { 552 CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, " 553 "alignment= %d", dmat->common.lowaddr, 554 ptoa((vm_paddr_t)Maxmem), 555 dmat->common.boundary, dmat->common.alignment); 556 CTR3(KTR_BUSDMA, "map= %p, nobouncemap= %p, pagesneeded= %d", 557 map, &nobounce_dmamap, map->pagesneeded); 558 /* 559 * Count the number of bounce pages 560 * needed in order to complete this transfer 561 */ 562 vaddr = (vm_offset_t)buf; 563 vendaddr = (vm_offset_t)buf + buflen; 564 565 while (vaddr < vendaddr) { 566 sg_len = MIN(vendaddr - vaddr, 567 PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK)); 568 if (pmap == kernel_pmap) 569 paddr = pmap_kextract(vaddr); 570 else 571 paddr = pmap_extract(pmap, vaddr); 572 if (must_bounce(dmat, paddr)) { 573 sg_len = roundup2(sg_len, 574 dmat->common.alignment); 575 map->pagesneeded++; 576 } 577 vaddr += sg_len; 578 } 579 CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); 580 } 581} 582 583static void 584_bus_dmamap_count_ma(bus_dma_tag_t dmat, bus_dmamap_t map, struct vm_page **ma, 585 int ma_offs, bus_size_t buflen, int flags) 586{ 587 bus_size_t sg_len; 588 int page_index; 589 vm_paddr_t paddr; 590 591 if (map != &nobounce_dmamap && map->pagesneeded == 0) { 592 CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, " 593 "alignment= %d", dmat->common.lowaddr, 594 ptoa((vm_paddr_t)Maxmem), 595 dmat->common.boundary, dmat->common.alignment); 596 CTR3(KTR_BUSDMA, "map= %p, nobouncemap= %p, pagesneeded= %d", 597 map, &nobounce_dmamap, map->pagesneeded); 598 599 /* 600 * Count the number of bounce pages 601 * needed in order to complete this transfer 602 */ 603 page_index = 0; 604 while (buflen > 0) { 605 paddr = VM_PAGE_TO_PHYS(ma[page_index]) + ma_offs; 606 sg_len = PAGE_SIZE - ma_offs; 607 sg_len = MIN(sg_len, buflen); 608 if (must_bounce(dmat, paddr)) { 609 sg_len = roundup2(sg_len, 610 dmat->common.alignment); 611 KASSERT(vm_addr_align_ok(sg_len, 612 dmat->common.alignment), 613 ("Segment size is not aligned")); 614 map->pagesneeded++; 615 } 616 if (((ma_offs + sg_len) & ~PAGE_MASK) != 0) 617 page_index++; 618 ma_offs = (ma_offs + sg_len) & PAGE_MASK; 619 KASSERT(buflen >= sg_len, 620 ("Segment length overruns original buffer")); 621 buflen -= sg_len; 622 } 623 CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); 624 } 625} 626 627/* 628 * Utility function to load a physical buffer. segp contains 629 * the starting segment on entrace, and the ending segment on exit. 630 */ 631static int 632bounce_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, 633 vm_paddr_t buf, bus_size_t buflen, int flags, bus_dma_segment_t *segs, 634 int *segp) 635{ 636 bus_size_t sgsize; 637 vm_paddr_t curaddr; 638 int error; 639 640 if (map == NULL) 641 map = &nobounce_dmamap; 642 643 if (segs == NULL) 644 segs = dmat->segments; 645 646 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) { 647 _bus_dmamap_count_phys(dmat, map, buf, buflen, flags); 648 if (map->pagesneeded != 0) { 649 error = _bus_dmamap_reserve_pages(dmat, map, flags); 650 if (error) 651 return (error); 652 } 653 } 654 655 while (buflen > 0) { 656 curaddr = buf; 657 sgsize = buflen; 658 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0 && 659 map->pagesneeded != 0 && 660 must_bounce(dmat, curaddr)) { 661 sgsize = MIN(sgsize, PAGE_SIZE - (curaddr & PAGE_MASK)); 662 curaddr = add_bounce_page(dmat, map, 0, curaddr, 0, 663 sgsize); 664 } 665 666 if (!_bus_dmamap_addsegs(dmat, map, curaddr, sgsize, segs, 667 segp)) 668 break; 669 buf += sgsize; 670 buflen -= sgsize; 671 } 672 673 /* 674 * Did we fit? 675 */ 676 return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */ 677} 678 679/* 680 * Utility function to load a linear buffer. segp contains 681 * the starting segment on entrace, and the ending segment on exit. 682 */ 683static int 684bounce_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 685 bus_size_t buflen, pmap_t pmap, int flags, bus_dma_segment_t *segs, 686 int *segp) 687{ 688 bus_size_t sgsize; 689 vm_paddr_t curaddr; 690 vm_offset_t kvaddr, vaddr; 691 int error; 692 693 if (map == NULL) 694 map = &nobounce_dmamap; 695 696 if (segs == NULL) 697 segs = dmat->segments; 698 699 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) { 700 _bus_dmamap_count_pages(dmat, map, pmap, buf, buflen, flags); 701 if (map->pagesneeded != 0) { 702 error = _bus_dmamap_reserve_pages(dmat, map, flags); 703 if (error) 704 return (error); 705 } 706 } 707 708 vaddr = (vm_offset_t)buf; 709 while (buflen > 0) { 710 /* 711 * Get the physical address for this segment. 712 */ 713 if (pmap == kernel_pmap) { 714 curaddr = pmap_kextract(vaddr); 715 kvaddr = vaddr; 716 } else { 717 curaddr = pmap_extract(pmap, vaddr); 718 kvaddr = 0; 719 } 720 721 /* 722 * Compute the segment size, and adjust counts. 723 */ 724 sgsize = MIN(buflen, PAGE_SIZE - (curaddr & PAGE_MASK)); 725 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0 && 726 map->pagesneeded != 0 && 727 must_bounce(dmat, curaddr)) { 728 sgsize = roundup2(sgsize, dmat->common.alignment); 729 curaddr = add_bounce_page(dmat, map, kvaddr, curaddr, 0, 730 sgsize); 731 } 732 if (!_bus_dmamap_addsegs(dmat, map, curaddr, sgsize, segs, 733 segp)) 734 break; 735 vaddr += sgsize; 736 buflen -= sgsize; 737 } 738 739 /* 740 * Did we fit? 741 */ 742 return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */ 743} 744 745static int 746bounce_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, 747 struct vm_page **ma, bus_size_t buflen, int ma_offs, int flags, 748 bus_dma_segment_t *segs, int *segp) 749{ 750 vm_paddr_t paddr, next_paddr; 751 int error, page_index; 752 bus_size_t sgsize; 753 754 if (dmat->common.flags & BUS_DMA_KEEP_PG_OFFSET) { 755 /* 756 * If we have to keep the offset of each page this function 757 * is not suitable, switch back to bus_dmamap_load_ma_triv 758 * which is going to do the right thing in this case. 759 */ 760 error = bus_dmamap_load_ma_triv(dmat, map, ma, buflen, ma_offs, 761 flags, segs, segp); 762 return (error); 763 } 764 765 if (map == NULL) 766 map = &nobounce_dmamap; 767 768 if (segs == NULL) 769 segs = dmat->segments; 770 771 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0) { 772 _bus_dmamap_count_ma(dmat, map, ma, ma_offs, buflen, flags); 773 if (map->pagesneeded != 0) { 774 error = _bus_dmamap_reserve_pages(dmat, map, flags); 775 if (error) 776 return (error); 777 } 778 } 779 780 page_index = 0; 781 while (buflen > 0) { 782 /* 783 * Compute the segment size, and adjust counts. 784 */ 785 paddr = VM_PAGE_TO_PHYS(ma[page_index]) + ma_offs; 786 sgsize = MIN(buflen, PAGE_SIZE - ma_offs); 787 if ((dmat->bounce_flags & BUS_DMA_COULD_BOUNCE) != 0 && 788 map->pagesneeded != 0 && 789 must_bounce(dmat, paddr)) { 790 sgsize = roundup2(sgsize, dmat->common.alignment); 791 KASSERT(vm_addr_align_ok(sgsize, 792 dmat->common.alignment), 793 ("Segment size is not aligned")); 794 /* 795 * Check if two pages of the user provided buffer 796 * are used. 797 */ 798 if ((ma_offs + sgsize) > PAGE_SIZE) 799 next_paddr = 800 VM_PAGE_TO_PHYS(ma[page_index + 1]); 801 else 802 next_paddr = 0; 803 paddr = add_bounce_page(dmat, map, 0, paddr, 804 next_paddr, sgsize); 805 } 806 if (!_bus_dmamap_addsegs(dmat, map, paddr, sgsize, segs, 807 segp)) 808 break; 809 KASSERT(buflen >= sgsize, 810 ("Segment length overruns original buffer")); 811 buflen -= sgsize; 812 if (((ma_offs + sgsize) & ~PAGE_MASK) != 0) 813 page_index++; 814 ma_offs = (ma_offs + sgsize) & PAGE_MASK; 815 } 816 817 /* 818 * Did we fit? 819 */ 820 return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */ 821} 822 823static void 824bounce_bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map, 825 struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg) 826{ 827 828 if (map == NULL) 829 return; 830 map->mem = *mem; 831 map->dmat = dmat; 832 map->callback = callback; 833 map->callback_arg = callback_arg; 834} 835 836static bus_dma_segment_t * 837bounce_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map, 838 bus_dma_segment_t *segs, int nsegs, int error) 839{ 840 841 if (segs == NULL) 842 segs = dmat->segments; 843 return (segs); 844} 845 846/* 847 * Release the mapping held by map. 848 */ 849static void 850bounce_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 851{ 852 if (map == NULL) 853 return; 854 855 free_bounce_pages(dmat, map); 856} 857 858static void 859bounce_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, 860 bus_dmasync_op_t op) 861{ 862 struct bounce_page *bpage; 863 vm_offset_t datavaddr, tempvaddr; 864 bus_size_t datacount1, datacount2; 865 866 if (map == NULL) 867 goto out; 868 if ((bpage = STAILQ_FIRST(&map->bpages)) == NULL) 869 goto out; 870 871 /* 872 * Handle data bouncing. We might also want to add support for 873 * invalidating the caches on broken hardware. 874 */ 875 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x " 876 "performing bounce", __func__, dmat, dmat->common.flags, op); 877 878 if ((op & BUS_DMASYNC_PREWRITE) != 0) { 879 while (bpage != NULL) { 880 tempvaddr = 0; 881 datavaddr = bpage->datavaddr; 882 datacount1 = bpage->datacount; 883 if (datavaddr == 0) { 884 tempvaddr = 885 pmap_quick_enter_page(bpage->datapage[0]); 886 datavaddr = tempvaddr | bpage->dataoffs; 887 datacount1 = min(PAGE_SIZE - bpage->dataoffs, 888 datacount1); 889 } 890 891 bcopy((void *)datavaddr, 892 (void *)bpage->vaddr, datacount1); 893 894 if (tempvaddr != 0) 895 pmap_quick_remove_page(tempvaddr); 896 897 if (bpage->datapage[1] == 0) { 898 KASSERT(datacount1 == bpage->datacount, 899 ("Mismatch between data size and provided memory space")); 900 goto next_w; 901 } 902 903 /* 904 * We are dealing with an unmapped buffer that expands 905 * over two pages. 906 */ 907 datavaddr = pmap_quick_enter_page(bpage->datapage[1]); 908 datacount2 = bpage->datacount - datacount1; 909 bcopy((void *)datavaddr, 910 (void *)(bpage->vaddr + datacount1), datacount2); 911 pmap_quick_remove_page(datavaddr); 912 913next_w: 914 bpage = STAILQ_NEXT(bpage, links); 915 } 916 dmat->bounce_zone->total_bounced++; 917 } 918 919 if ((op & BUS_DMASYNC_POSTREAD) != 0) { 920 while (bpage != NULL) { 921 tempvaddr = 0; 922 datavaddr = bpage->datavaddr; 923 datacount1 = bpage->datacount; 924 if (datavaddr == 0) { 925 tempvaddr = 926 pmap_quick_enter_page(bpage->datapage[0]); 927 datavaddr = tempvaddr | bpage->dataoffs; 928 datacount1 = min(PAGE_SIZE - bpage->dataoffs, 929 datacount1); 930 } 931 932 bcopy((void *)bpage->vaddr, (void *)datavaddr, 933 datacount1); 934 935 if (tempvaddr != 0) 936 pmap_quick_remove_page(tempvaddr); 937 938 if (bpage->datapage[1] == 0) { 939 KASSERT(datacount1 == bpage->datacount, 940 ("Mismatch between data size and provided memory space")); 941 goto next_r; 942 } 943 944 /* 945 * We are dealing with an unmapped buffer that expands 946 * over two pages. 947 */ 948 datavaddr = pmap_quick_enter_page(bpage->datapage[1]); 949 datacount2 = bpage->datacount - datacount1; 950 bcopy((void *)(bpage->vaddr + datacount1), 951 (void *)datavaddr, datacount2); 952 pmap_quick_remove_page(datavaddr); 953 954next_r: 955 bpage = STAILQ_NEXT(bpage, links); 956 } 957 dmat->bounce_zone->total_bounced++; 958 } 959out: 960 atomic_thread_fence_rel(); 961 if (map != NULL) 962 kmsan_bus_dmamap_sync(&map->kmsan_mem, op); 963} 964 965#ifdef KMSAN 966static void 967bounce_bus_dmamap_load_kmsan(bus_dmamap_t map, struct memdesc *mem) 968{ 969 if (map == NULL) 970 return; 971 memcpy(&map->kmsan_mem, mem, sizeof(map->kmsan_mem)); 972} 973#endif 974 975struct bus_dma_impl bus_dma_bounce_impl = { 976 .tag_create = bounce_bus_dma_tag_create, 977 .tag_destroy = bounce_bus_dma_tag_destroy, 978 .tag_set_domain = bounce_bus_dma_tag_set_domain, 979 .id_mapped = bounce_bus_dma_id_mapped, 980 .map_create = bounce_bus_dmamap_create, 981 .map_destroy = bounce_bus_dmamap_destroy, 982 .mem_alloc = bounce_bus_dmamem_alloc, 983 .mem_free = bounce_bus_dmamem_free, 984 .load_phys = bounce_bus_dmamap_load_phys, 985 .load_buffer = bounce_bus_dmamap_load_buffer, 986 .load_ma = bounce_bus_dmamap_load_ma, 987 .map_waitok = bounce_bus_dmamap_waitok, 988 .map_complete = bounce_bus_dmamap_complete, 989 .map_unload = bounce_bus_dmamap_unload, 990 .map_sync = bounce_bus_dmamap_sync, 991#ifdef KMSAN 992 .load_kmsan = bounce_bus_dmamap_load_kmsan, 993#endif 994}; 995