sys/kern/subr_bus_dma.c

   1 /*-
   2  * Copyright (c) 2012 EMC Corp.
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 1997, 1998 Justin T. Gibbs.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include "opt_bus.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/conf.h>
  37 #include <sys/systm.h>
  38 #include <sys/bio.h>
  39 #include <sys/bus.h>
  40 #include <sys/callout.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/memdesc.h>
  43 #include <sys/proc.h>
  44 #include <sys/uio.h>
  45
  46 #include <vm/vm.h>
  47 #include <vm/vm_page.h>
  48 #include <vm/vm_map.h>
  49 #include <vm/pmap.h>
  50
  51 #include <cam/cam.h>
  52 #include <cam/cam_ccb.h>
  53
  54 #include <machine/bus.h>
  55
  56 /*
  57  * Load up data starting at offset within a region specified by a
  58  * list of virtual address ranges until either length or the region
  59  * are exhausted.
  60  */
  61 static int
  62 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
  63     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
  64     int flags, size_t offset, size_t length)
  65 {
  66         int error;
  67
  68         error = 0;
  69         for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
  70                 char *addr;
  71                 size_t ds_len;
  72
  73                 KASSERT((offset < list->ds_len),
  74                     ("Invalid mid-segment offset"));
  75                 addr = (char *)(uintptr_t)list->ds_addr + offset;
  76                 ds_len = list->ds_len - offset;
  77                 offset = 0;
  78                 if (ds_len > length)
  79                         ds_len = length;
  80                 length -= ds_len;
  81                 KASSERT((ds_len != 0), ("Segment length is zero"));
  82                 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
  83                     flags, NULL, nsegs);
  84                 if (error)
  85                         break;
  86         }
  87         return (error);
  88 }
  89
  90 /*
  91  * Load a list of physical addresses.
  92  */
  93 static int
  94 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
  95     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
  96 {
  97         int error;
  98
  99         error = 0;
 100         for (; sglist_cnt > 0; sglist_cnt--, list++) {
 101                 error = _bus_dmamap_load_phys(dmat, map,
 102                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
 103                     nsegs);
 104                 if (error)
 105                         break;
 106         }
 107         return (error);
 108 }
 109
 110 /*
 111  * Load an mbuf chain.
 112  */
 113 static int
 114 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
 115     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
 116 {
 117         struct mbuf *m;
 118         int error;
 119
 120         error = 0;
 121         for (m = m0; m != NULL && error == 0; m = m->m_next) {
 122                 if (m->m_len > 0) {
 123                         error = _bus_dmamap_load_buffer(dmat, map, m->m_data,
 124                             m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF,
 125                             segs, nsegs);
 126                 }
 127         }
 128         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 129             __func__, dmat, flags, error, *nsegs);
 130         return (error);
 131 }
 132
 133 /*
 134  * Load tlen data starting at offset within a region specified by a list of
 135  * physical pages.
 136  */
 137 static int
 138 _bus_dmamap_load_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
 139     vm_page_t *pages, bus_size_t tlen, int offset, int *nsegs, int flags)
 140 {
 141         vm_paddr_t paddr;
 142         bus_size_t len;
 143         int error, i;
 144
 145         for (i = 0, error = 0; error == 0 && tlen > 0; i++, tlen -= len) {
 146                 len = min(PAGE_SIZE - offset, tlen);
 147                 paddr = VM_PAGE_TO_PHYS(pages[i]) + offset;
 148                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
 149                     flags, NULL, nsegs);
 150                 offset = 0;
 151         }
 152         return (error);
 153 }
 154
 155 /*
 156  * Load from block io.
 157  */
 158 static int
 159 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
 160     int *nsegs, int flags)
 161 {
 162
 163         if ((bio->bio_flags & BIO_VLIST) != 0) {
 164                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
 165                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
 166                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
 167                     bio->bio_bcount));
 168         }
 169
 170         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
 171                 return (_bus_dmamap_load_pages(dmat, map, bio->bio_ma,
 172                     bio->bio_bcount, bio->bio_ma_offset, nsegs, flags));
 173
 174         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
 175             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
 176 }
 177
 178 int
 179 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
 180     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
 181     bus_dma_segment_t *segs, int *segp)
 182 {
 183         vm_paddr_t paddr;
 184         bus_size_t len;
 185         int error, i;
 186
 187         error = 0;
 188         for (i = 0; tlen > 0; i++, tlen -= len) {
 189                 len = min(PAGE_SIZE - ma_offs, tlen);
 190                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
 191                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
 192                     flags, segs, segp);
 193                 if (error != 0)
 194                         break;
 195                 ma_offs = 0;
 196         }
 197         return (error);
 198 }
 199
 200 /*
 201  * Load a cam control block.
 202  */
 203 static int
 204 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
 205                     int *nsegs, int flags)
 206 {
 207         struct ccb_hdr *ccb_h;
 208         void *data_ptr;
 209         int error;
 210         uint32_t dxfer_len;
 211         uint16_t sglist_cnt;
 212
 213         error = 0;
 214         ccb_h = &ccb->ccb_h;
 215         switch (ccb_h->func_code) {
 216         case XPT_SCSI_IO: {
 217                 struct ccb_scsiio *csio;
 218
 219                 csio = &ccb->csio;
 220                 data_ptr = csio->data_ptr;
 221                 dxfer_len = csio->dxfer_len;
 222                 sglist_cnt = csio->sglist_cnt;
 223                 break;
 224         }
 225         case XPT_CONT_TARGET_IO: {
 226                 struct ccb_scsiio *ctio;
 227
 228                 ctio = &ccb->ctio;
 229                 data_ptr = ctio->data_ptr;
 230                 dxfer_len = ctio->dxfer_len;
 231                 sglist_cnt = ctio->sglist_cnt;
 232                 break;
 233         }
 234         case XPT_ATA_IO: {
 235                 struct ccb_ataio *ataio;
 236
 237                 ataio = &ccb->ataio;
 238                 data_ptr = ataio->data_ptr;
 239                 dxfer_len = ataio->dxfer_len;
 240                 sglist_cnt = 0;
 241                 break;
 242         }
 243         default:
 244                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
 245                     ccb_h->func_code);
 246         }
 247
 248         switch ((ccb_h->flags & CAM_DATA_MASK)) {
 249         case CAM_DATA_VADDR:
 250                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
 251                     kernel_pmap, flags, NULL, nsegs);
 252                 break;
 253         case CAM_DATA_PADDR:
 254                 error = _bus_dmamap_load_phys(dmat, map,
 255                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
 256                     nsegs);
 257                 break;
 258         case CAM_DATA_SG:
 259                 error = _bus_dmamap_load_vlist(dmat, map,
 260                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
 261                     nsegs, flags, 0, dxfer_len);
 262                 break;
 263         case CAM_DATA_SG_PADDR:
 264                 error = _bus_dmamap_load_plist(dmat, map,
 265                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
 266                 break;
 267         case CAM_DATA_BIO:
 268                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
 269                     nsegs, flags);
 270                 break;
 271         default:
 272                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
 273                     ccb_h->flags);
 274         }
 275         return (error);
 276 }
 277
 278 /*
 279  * Load a uio.
 280  */
 281 static int
 282 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
 283     int *nsegs, int flags)
 284 {
 285         bus_size_t resid;
 286         bus_size_t minlen;
 287         struct iovec *iov;
 288         pmap_t pmap;
 289         caddr_t addr;
 290         int error, i;
 291
 292         if (uio->uio_segflg == UIO_USERSPACE) {
 293                 KASSERT(uio->uio_td != NULL,
 294                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
 295                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
 296         } else
 297                 pmap = kernel_pmap;
 298         resid = uio->uio_resid;
 299         iov = uio->uio_iov;
 300         error = 0;
 301
 302         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
 303                 /*
 304                  * Now at the first iovec to load.  Load each iovec
 305                  * until we have exhausted the residual count.
 306                  */
 307
 308                 addr = (caddr_t) iov[i].iov_base;
 309                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
 310                 if (minlen > 0) {
 311                         error = _bus_dmamap_load_buffer(dmat, map, addr,
 312                             minlen, pmap, flags, NULL, nsegs);
 313                         resid -= minlen;
 314                 }
 315         }
 316
 317         return (error);
 318 }
 319
 320 /*
 321  * Map the buffer buf into bus space using the dmamap map.
 322  */
 323 int
 324 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
 325     bus_size_t buflen, bus_dmamap_callback_t *callback,
 326     void *callback_arg, int flags)
 327 {
 328         bus_dma_segment_t *segs;
 329         struct memdesc mem;
 330         int error;
 331         int nsegs;
 332
 333         if ((flags & BUS_DMA_NOWAIT) == 0) {
 334                 mem = memdesc_vaddr(buf, buflen);
 335                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
 336         }
 337
 338         nsegs = -1;
 339         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
 340             flags, NULL, &nsegs);
 341         nsegs++;
 342
 343         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 344             __func__, dmat, flags, error, nsegs);
 345
 346         if (error == EINPROGRESS)
 347                 return (error);
 348
 349         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 350         if (error)
 351                 (*callback)(callback_arg, segs, 0, error);
 352         else
 353                 (*callback)(callback_arg, segs, nsegs, 0);
 354
 355         /*
 356          * Return ENOMEM to the caller so that it can pass it up the stack.
 357          * This error only happens when NOWAIT is set, so deferral is disabled.
 358          */
 359         if (error == ENOMEM)
 360                 return (error);
 361
 362         return (0);
 363 }
 364
 365 int
 366 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
 367     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
 368 {
 369         bus_dma_segment_t *segs;
 370         int nsegs, error;
 371
 372         M_ASSERTPKTHDR(m0);
 373
 374         flags |= BUS_DMA_NOWAIT;
 375         nsegs = -1;
 376         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
 377         ++nsegs;
 378
 379         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 380         if (error)
 381                 (*callback)(callback_arg, segs, 0, 0, error);
 382         else
 383                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
 384
 385         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 386             __func__, dmat, flags, error, nsegs);
 387         return (error);
 388 }
 389
 390 int
 391 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
 392     bus_dma_segment_t *segs, int *nsegs, int flags)
 393 {
 394         int error;
 395
 396         flags |= BUS_DMA_NOWAIT;
 397         *nsegs = -1;
 398         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
 399         ++*nsegs;
 400         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
 401         return (error);
 402 }
 403
 404 int
 405 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
 406     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
 407 {
 408         bus_dma_segment_t *segs;
 409         int nsegs, error;
 410
 411         flags |= BUS_DMA_NOWAIT;
 412         nsegs = -1;
 413         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
 414         nsegs++;
 415
 416         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 417         if (error)
 418                 (*callback)(callback_arg, segs, 0, 0, error);
 419         else
 420                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
 421
 422         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 423             __func__, dmat, flags, error, nsegs);
 424         return (error);
 425 }
 426
 427 int
 428 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
 429                     bus_dmamap_callback_t *callback, void *callback_arg,
 430                     int flags)
 431 {
 432         bus_dma_segment_t *segs;
 433         struct ccb_hdr *ccb_h;
 434         struct memdesc mem;
 435         int error;
 436         int nsegs;
 437
 438         ccb_h = &ccb->ccb_h;
 439         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
 440                 callback(callback_arg, NULL, 0, 0);
 441                 return (0);
 442         }
 443         if ((flags & BUS_DMA_NOWAIT) == 0) {
 444                 mem = memdesc_ccb(ccb);
 445                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
 446         }
 447         nsegs = -1;
 448         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
 449         nsegs++;
 450
 451         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 452             __func__, dmat, flags, error, nsegs);
 453
 454         if (error == EINPROGRESS)
 455                 return (error);
 456
 457         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 458         if (error)
 459                 (*callback)(callback_arg, segs, 0, error);
 460         else
 461                 (*callback)(callback_arg, segs, nsegs, error);
 462         /*
 463          * Return ENOMEM to the caller so that it can pass it up the stack.
 464          * This error only happens when NOWAIT is set, so deferral is disabled.
 465          */
 466         if (error == ENOMEM)
 467                 return (error);
 468
 469         return (0);
 470 }
 471
 472 int
 473 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
 474                     bus_dmamap_callback_t *callback, void *callback_arg,
 475                     int flags)
 476 {
 477         bus_dma_segment_t *segs;
 478         struct memdesc mem;
 479         int error;
 480         int nsegs;
 481
 482         if ((flags & BUS_DMA_NOWAIT) == 0) {
 483                 mem = memdesc_bio(bio);
 484                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
 485         }
 486         nsegs = -1;
 487         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
 488         nsegs++;
 489
 490         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 491             __func__, dmat, flags, error, nsegs);
 492
 493         if (error == EINPROGRESS)
 494                 return (error);
 495
 496         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 497         if (error)
 498                 (*callback)(callback_arg, segs, 0, error);
 499         else
 500                 (*callback)(callback_arg, segs, nsegs, error);
 501         /*
 502          * Return ENOMEM to the caller so that it can pass it up the stack.
 503          * This error only happens when NOWAIT is set, so deferral is disabled.
 504          */
 505         if (error == ENOMEM)
 506                 return (error);
 507
 508         return (0);
 509 }
 510
 511 int
 512 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
 513     struct memdesc *mem, bus_dmamap_callback_t *callback,
 514     void *callback_arg, int flags)
 515 {
 516         bus_dma_segment_t *segs;
 517         int error;
 518         int nsegs;
 519
 520         if ((flags & BUS_DMA_NOWAIT) == 0)
 521                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
 522
 523         nsegs = -1;
 524         error = 0;
 525         switch (mem->md_type) {
 526         case MEMDESC_VADDR:
 527                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
 528                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
 529                 break;
 530         case MEMDESC_PADDR:
 531                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
 532                     mem->md_opaque, flags, NULL, &nsegs);
 533                 break;
 534         case MEMDESC_VLIST:
 535                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
 536                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
 537                 break;
 538         case MEMDESC_PLIST:
 539                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
 540                     mem->md_opaque, &nsegs, flags);
 541                 break;
 542         case MEMDESC_BIO:
 543                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
 544                     &nsegs, flags);
 545                 break;
 546         case MEMDESC_UIO:
 547                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
 548                     &nsegs, flags);
 549                 break;
 550         case MEMDESC_MBUF:
 551                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
 552                     NULL, &nsegs, flags);
 553                 break;
 554         case MEMDESC_CCB:
 555                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
 556                     flags);
 557                 break;
 558         }
 559         nsegs++;
 560
 561         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
 562             __func__, dmat, flags, error, nsegs);
 563
 564         if (error == EINPROGRESS)
 565                 return (error);
 566
 567         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
 568         if (error)
 569                 (*callback)(callback_arg, segs, 0, error);
 570         else
 571                 (*callback)(callback_arg, segs, nsegs, 0);
 572
 573         /*
 574          * Return ENOMEM to the caller so that it can pass it up the stack.
 575          * This error only happens when NOWAIT is set, so deferral is disabled.
 576          */
 577         if (error == ENOMEM)
 578                 return (error);
 579
 580         return (0);
 581 }