1246713Skib/*- 2246713Skib * Copyright (c) 2012 EMC Corp. 3246713Skib * All rights reserved. 4246713Skib * 5246713Skib * Copyright (c) 1997, 1998 Justin T. Gibbs. 6246713Skib * All rights reserved. 7246713Skib * 8246713Skib * Redistribution and use in source and binary forms, with or without 9246713Skib * modification, are permitted provided that the following conditions 10246713Skib * are met: 11246713Skib * 1. Redistributions of source code must retain the above copyright 12246713Skib * notice, this list of conditions and the following disclaimer. 13246713Skib * 2. Redistributions in binary form must reproduce the above copyright 14246713Skib * notice, this list of conditions and the following disclaimer in the 15246713Skib * documentation and/or other materials provided with the distribution. 16246713Skib * 17246713Skib * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18246713Skib * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19246713Skib * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20246713Skib * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21246713Skib * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22246713Skib * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23246713Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24246713Skib * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25246713Skib * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26246713Skib * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27246713Skib * SUCH DAMAGE. 28246713Skib */ 29246713Skib 30246713Skib#include <sys/cdefs.h> 31246713Skib__FBSDID("$FreeBSD$"); 32246713Skib 33246713Skib#include "opt_bus.h" 34246713Skib 35246713Skib#include <sys/param.h> 36246713Skib#include <sys/conf.h> 37246713Skib#include <sys/systm.h> 38246713Skib#include <sys/bio.h> 39246713Skib#include <sys/bus.h> 40246713Skib#include <sys/callout.h> 41246713Skib#include <sys/mbuf.h> 42246713Skib#include <sys/memdesc.h> 43246713Skib#include <sys/proc.h> 44246713Skib#include <sys/uio.h> 45246713Skib 46246713Skib#include <vm/vm.h> 47246713Skib#include <vm/vm_page.h> 48246713Skib#include <vm/vm_map.h> 49246713Skib#include <vm/pmap.h> 50246713Skib 51246713Skib#include <cam/cam.h> 52246713Skib#include <cam/cam_ccb.h> 53246713Skib 54246713Skib#include <machine/bus.h> 55246713Skib 56246713Skib/* 57246713Skib * Load a list of virtual addresses. 58246713Skib */ 59246713Skibstatic int 60246713Skib_bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map, 61246713Skib bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs, 62246713Skib int flags) 63246713Skib{ 64246713Skib int error; 65246713Skib 66246713Skib error = 0; 67246713Skib for (; sglist_cnt > 0; sglist_cnt--, list++) { 68246713Skib error = _bus_dmamap_load_buffer(dmat, map, 69249538Skib (void *)(uintptr_t)list->ds_addr, list->ds_len, pmap, 70249538Skib flags, NULL, nsegs); 71246713Skib if (error) 72246713Skib break; 73246713Skib } 74246713Skib return (error); 75246713Skib} 76246713Skib 77246713Skib/* 78246713Skib * Load a list of physical addresses. 79246713Skib */ 80246713Skibstatic int 81246713Skib_bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map, 82246713Skib bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags) 83246713Skib{ 84246713Skib int error; 85246713Skib 86246713Skib error = 0; 87246713Skib for (; sglist_cnt > 0; sglist_cnt--, list++) { 88246713Skib error = _bus_dmamap_load_phys(dmat, map, 89246713Skib (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL, 90246713Skib nsegs); 91246713Skib if (error) 92246713Skib break; 93246713Skib } 94246713Skib return (error); 95246713Skib} 96246713Skib 97246713Skib/* 98246713Skib * Load an mbuf chain. 99246713Skib */ 100246713Skibstatic int 101246713Skib_bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 102246713Skib struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags) 103246713Skib{ 104246713Skib struct mbuf *m; 105246713Skib int error; 106246713Skib 107246713Skib error = 0; 108246713Skib for (m = m0; m != NULL && error == 0; m = m->m_next) { 109246713Skib if (m->m_len > 0) { 110246713Skib error = _bus_dmamap_load_buffer(dmat, map, m->m_data, 111246713Skib m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF, 112246713Skib segs, nsegs); 113246713Skib } 114246713Skib } 115246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 116246713Skib __func__, dmat, flags, error, *nsegs); 117246713Skib return (error); 118246713Skib} 119246713Skib 120246713Skib/* 121246713Skib * Load from block io. 122246713Skib */ 123246713Skibstatic int 124246713Skib_bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 125246713Skib int *nsegs, int flags) 126246713Skib{ 127259510Skib int error; 128246713Skib 129248508Skib if ((bio->bio_flags & BIO_UNMAPPED) == 0) { 130248508Skib error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data, 131248508Skib bio->bio_bcount, kernel_pmap, flags, NULL, nsegs); 132259510Skib } else { 133259510Skib error = _bus_dmamap_load_ma(dmat, map, bio->bio_ma, 134259510Skib bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs); 135248508Skib } 136259510Skib return (error); 137259510Skib} 138246713Skib 139259510Skibint 140259510Skibbus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map, 141259510Skib struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags, 142259510Skib bus_dma_segment_t *segs, int *segp) 143259510Skib{ 144259510Skib vm_paddr_t paddr; 145259510Skib bus_size_t len; 146259510Skib int error, i; 147259510Skib 148248508Skib error = 0; 149248508Skib for (i = 0; tlen > 0; i++, tlen -= len) { 150248508Skib len = min(PAGE_SIZE - ma_offs, tlen); 151259510Skib paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs; 152248508Skib error = _bus_dmamap_load_phys(dmat, map, paddr, len, 153259510Skib flags, segs, segp); 154248508Skib if (error != 0) 155248508Skib break; 156248508Skib ma_offs = 0; 157248508Skib } 158246713Skib return (error); 159246713Skib} 160246713Skib 161246713Skib/* 162246713Skib * Load a cam control block. 163246713Skib */ 164246713Skibstatic int 165246713Skib_bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 166246713Skib int *nsegs, int flags) 167246713Skib{ 168246713Skib struct ccb_hdr *ccb_h; 169246713Skib void *data_ptr; 170246713Skib int error; 171246713Skib uint32_t dxfer_len; 172246713Skib uint16_t sglist_cnt; 173246713Skib 174246713Skib error = 0; 175246713Skib ccb_h = &ccb->ccb_h; 176246713Skib switch (ccb_h->func_code) { 177249025Sken case XPT_SCSI_IO: { 178249025Sken struct ccb_scsiio *csio; 179249025Sken 180246713Skib csio = &ccb->csio; 181246713Skib data_ptr = csio->data_ptr; 182246713Skib dxfer_len = csio->dxfer_len; 183246713Skib sglist_cnt = csio->sglist_cnt; 184246713Skib break; 185249025Sken } 186249025Sken case XPT_CONT_TARGET_IO: { 187249025Sken struct ccb_scsiio *ctio; 188249025Sken 189249025Sken ctio = &ccb->ctio; 190249025Sken data_ptr = ctio->data_ptr; 191249025Sken dxfer_len = ctio->dxfer_len; 192249025Sken sglist_cnt = ctio->sglist_cnt; 193249025Sken break; 194249025Sken } 195249025Sken case XPT_ATA_IO: { 196249025Sken struct ccb_ataio *ataio; 197249025Sken 198246713Skib ataio = &ccb->ataio; 199246713Skib data_ptr = ataio->data_ptr; 200246713Skib dxfer_len = ataio->dxfer_len; 201246713Skib sglist_cnt = 0; 202246713Skib break; 203249025Sken } 204246713Skib default: 205246713Skib panic("_bus_dmamap_load_ccb: Unsupported func code %d", 206246713Skib ccb_h->func_code); 207246713Skib } 208246713Skib 209246713Skib switch ((ccb_h->flags & CAM_DATA_MASK)) { 210246713Skib case CAM_DATA_VADDR: 211246713Skib error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len, 212246713Skib kernel_pmap, flags, NULL, nsegs); 213246713Skib break; 214246713Skib case CAM_DATA_PADDR: 215246713Skib error = _bus_dmamap_load_phys(dmat, map, 216246713Skib (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL, 217246713Skib nsegs); 218246713Skib break; 219246713Skib case CAM_DATA_SG: 220246713Skib error = _bus_dmamap_load_vlist(dmat, map, 221246713Skib (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap, 222246713Skib nsegs, flags); 223246713Skib break; 224246713Skib case CAM_DATA_SG_PADDR: 225246713Skib error = _bus_dmamap_load_plist(dmat, map, 226246713Skib (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags); 227246713Skib break; 228246713Skib case CAM_DATA_BIO: 229246713Skib error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr, 230246713Skib nsegs, flags); 231246713Skib break; 232246713Skib default: 233246713Skib panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented", 234246713Skib ccb_h->flags); 235246713Skib } 236246713Skib return (error); 237246713Skib} 238246713Skib 239246713Skib/* 240246713Skib * Load a uio. 241246713Skib */ 242246713Skibstatic int 243246713Skib_bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 244246713Skib int *nsegs, int flags) 245246713Skib{ 246246713Skib bus_size_t resid; 247246713Skib bus_size_t minlen; 248246713Skib struct iovec *iov; 249246713Skib pmap_t pmap; 250246713Skib caddr_t addr; 251246713Skib int error, i; 252246713Skib 253246713Skib if (uio->uio_segflg == UIO_USERSPACE) { 254246713Skib KASSERT(uio->uio_td != NULL, 255246713Skib ("bus_dmamap_load_uio: USERSPACE but no proc")); 256246713Skib pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 257246713Skib } else 258246713Skib pmap = kernel_pmap; 259246713Skib resid = uio->uio_resid; 260246713Skib iov = uio->uio_iov; 261246713Skib error = 0; 262246713Skib 263246713Skib for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 264246713Skib /* 265246713Skib * Now at the first iovec to load. Load each iovec 266246713Skib * until we have exhausted the residual count. 267246713Skib */ 268246713Skib 269246713Skib addr = (caddr_t) iov[i].iov_base; 270246713Skib minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len; 271246713Skib if (minlen > 0) { 272246713Skib error = _bus_dmamap_load_buffer(dmat, map, addr, 273246713Skib minlen, pmap, flags, NULL, nsegs); 274246713Skib resid -= minlen; 275246713Skib } 276246713Skib } 277246713Skib 278246713Skib return (error); 279246713Skib} 280246713Skib 281246713Skib/* 282246713Skib * Map the buffer buf into bus space using the dmamap map. 283246713Skib */ 284246713Skibint 285246713Skibbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 286246713Skib bus_size_t buflen, bus_dmamap_callback_t *callback, 287246713Skib void *callback_arg, int flags) 288246713Skib{ 289246713Skib bus_dma_segment_t *segs; 290246713Skib struct memdesc mem; 291246713Skib int error; 292246713Skib int nsegs; 293246713Skib 294246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) { 295246713Skib mem = memdesc_vaddr(buf, buflen); 296246713Skib _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 297246713Skib } 298246713Skib 299246713Skib nsegs = -1; 300246713Skib error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap, 301246713Skib flags, NULL, &nsegs); 302246713Skib nsegs++; 303246713Skib 304246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 305248892Sjimharris __func__, dmat, flags, error, nsegs); 306246713Skib 307246713Skib if (error == EINPROGRESS) 308246713Skib return (error); 309246713Skib 310246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 311246713Skib if (error) 312246713Skib (*callback)(callback_arg, segs, 0, error); 313246713Skib else 314246713Skib (*callback)(callback_arg, segs, nsegs, 0); 315246713Skib 316246713Skib /* 317246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 318248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 319246713Skib */ 320246713Skib if (error == ENOMEM) 321246713Skib return (error); 322246713Skib 323246713Skib return (0); 324246713Skib} 325246713Skib 326246713Skibint 327246713Skibbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 328246713Skib bus_dmamap_callback2_t *callback, void *callback_arg, int flags) 329246713Skib{ 330246713Skib bus_dma_segment_t *segs; 331246713Skib int nsegs, error; 332246713Skib 333251221Smarius M_ASSERTPKTHDR(m0); 334251221Smarius 335246713Skib flags |= BUS_DMA_NOWAIT; 336246713Skib nsegs = -1; 337246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags); 338246713Skib ++nsegs; 339246713Skib 340246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 341246713Skib if (error) 342246713Skib (*callback)(callback_arg, segs, 0, 0, error); 343246713Skib else 344246713Skib (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error); 345246713Skib 346246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 347246713Skib __func__, dmat, flags, error, nsegs); 348246713Skib return (error); 349246713Skib} 350246713Skib 351246713Skibint 352246713Skibbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 353246713Skib bus_dma_segment_t *segs, int *nsegs, int flags) 354246713Skib{ 355246713Skib int error; 356246713Skib 357246713Skib flags |= BUS_DMA_NOWAIT; 358246713Skib *nsegs = -1; 359246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags); 360246713Skib ++*nsegs; 361246713Skib _bus_dmamap_complete(dmat, map, segs, *nsegs, error); 362246713Skib return (error); 363246713Skib} 364246713Skib 365246713Skibint 366246713Skibbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 367246713Skib bus_dmamap_callback2_t *callback, void *callback_arg, int flags) 368246713Skib{ 369246713Skib bus_dma_segment_t *segs; 370246713Skib int nsegs, error; 371246713Skib 372246713Skib flags |= BUS_DMA_NOWAIT; 373246713Skib nsegs = -1; 374246713Skib error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags); 375246713Skib nsegs++; 376246713Skib 377246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 378246713Skib if (error) 379246713Skib (*callback)(callback_arg, segs, 0, 0, error); 380246713Skib else 381246713Skib (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error); 382246713Skib 383246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 384248892Sjimharris __func__, dmat, flags, error, nsegs); 385246713Skib return (error); 386246713Skib} 387246713Skib 388246713Skibint 389246713Skibbus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 390246713Skib bus_dmamap_callback_t *callback, void *callback_arg, 391246713Skib int flags) 392246713Skib{ 393246713Skib bus_dma_segment_t *segs; 394246713Skib struct ccb_hdr *ccb_h; 395246713Skib struct memdesc mem; 396246713Skib int error; 397246713Skib int nsegs; 398246713Skib 399246713Skib ccb_h = &ccb->ccb_h; 400246713Skib if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) { 401246713Skib callback(callback_arg, NULL, 0, 0); 402246713Skib return (0); 403246713Skib } 404246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) { 405246713Skib mem = memdesc_ccb(ccb); 406246713Skib _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 407246713Skib } 408246713Skib nsegs = -1; 409246713Skib error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags); 410246713Skib nsegs++; 411248893Sjimharris 412248893Sjimharris CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 413248893Sjimharris __func__, dmat, flags, error, nsegs); 414248893Sjimharris 415246713Skib if (error == EINPROGRESS) 416246713Skib return (error); 417246713Skib 418246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 419246713Skib if (error) 420246713Skib (*callback)(callback_arg, segs, 0, error); 421246713Skib else 422246713Skib (*callback)(callback_arg, segs, nsegs, error); 423246713Skib /* 424246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 425248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 426246713Skib */ 427246713Skib if (error == ENOMEM) 428246713Skib return (error); 429246713Skib 430246713Skib return (0); 431246713Skib} 432246713Skib 433246713Skibint 434248896Sjimharrisbus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 435248896Sjimharris bus_dmamap_callback_t *callback, void *callback_arg, 436248896Sjimharris int flags) 437248896Sjimharris{ 438248896Sjimharris bus_dma_segment_t *segs; 439248896Sjimharris struct memdesc mem; 440248896Sjimharris int error; 441248896Sjimharris int nsegs; 442248896Sjimharris 443248896Sjimharris if ((flags & BUS_DMA_NOWAIT) == 0) { 444248896Sjimharris mem = memdesc_bio(bio); 445248896Sjimharris _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 446248896Sjimharris } 447248896Sjimharris nsegs = -1; 448248896Sjimharris error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags); 449248896Sjimharris nsegs++; 450248896Sjimharris 451248896Sjimharris CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 452248896Sjimharris __func__, dmat, flags, error, nsegs); 453248896Sjimharris 454248896Sjimharris if (error == EINPROGRESS) 455248896Sjimharris return (error); 456248896Sjimharris 457248896Sjimharris segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 458248896Sjimharris if (error) 459248896Sjimharris (*callback)(callback_arg, segs, 0, error); 460248896Sjimharris else 461248896Sjimharris (*callback)(callback_arg, segs, nsegs, error); 462248896Sjimharris /* 463248896Sjimharris * Return ENOMEM to the caller so that it can pass it up the stack. 464248896Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 465248896Sjimharris */ 466248896Sjimharris if (error == ENOMEM) 467248896Sjimharris return (error); 468248896Sjimharris 469248896Sjimharris return (0); 470248896Sjimharris} 471248896Sjimharris 472248896Sjimharrisint 473246713Skibbus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map, 474246713Skib struct memdesc *mem, bus_dmamap_callback_t *callback, 475246713Skib void *callback_arg, int flags) 476246713Skib{ 477246713Skib bus_dma_segment_t *segs; 478246713Skib int error; 479246713Skib int nsegs; 480246713Skib 481246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) 482246713Skib _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg); 483246713Skib 484246713Skib nsegs = -1; 485246713Skib error = 0; 486246713Skib switch (mem->md_type) { 487246713Skib case MEMDESC_VADDR: 488246713Skib error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr, 489246713Skib mem->md_opaque, kernel_pmap, flags, NULL, &nsegs); 490246713Skib break; 491246713Skib case MEMDESC_PADDR: 492246713Skib error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr, 493246713Skib mem->md_opaque, flags, NULL, &nsegs); 494246713Skib break; 495246713Skib case MEMDESC_VLIST: 496246713Skib error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list, 497246713Skib mem->md_opaque, kernel_pmap, &nsegs, flags); 498246713Skib break; 499246713Skib case MEMDESC_PLIST: 500246713Skib error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list, 501246713Skib mem->md_opaque, &nsegs, flags); 502246713Skib break; 503246713Skib case MEMDESC_BIO: 504246713Skib error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio, 505246713Skib &nsegs, flags); 506246713Skib break; 507246713Skib case MEMDESC_UIO: 508246713Skib error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio, 509246713Skib &nsegs, flags); 510246713Skib break; 511246713Skib case MEMDESC_MBUF: 512246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf, 513246713Skib NULL, &nsegs, flags); 514246713Skib break; 515246713Skib case MEMDESC_CCB: 516246713Skib error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs, 517246713Skib flags); 518246713Skib break; 519246713Skib } 520246713Skib nsegs++; 521246713Skib 522246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 523248892Sjimharris __func__, dmat, flags, error, nsegs); 524246713Skib 525246713Skib if (error == EINPROGRESS) 526246713Skib return (error); 527246713Skib 528246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 529246713Skib if (error) 530246713Skib (*callback)(callback_arg, segs, 0, error); 531246713Skib else 532246713Skib (*callback)(callback_arg, segs, nsegs, 0); 533246713Skib 534246713Skib /* 535246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 536248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 537246713Skib */ 538246713Skib if (error == ENOMEM) 539246713Skib return (error); 540246713Skib 541246713Skib return (0); 542246713Skib} 543