subr_bus_dma.c revision 249538
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: head/sys/kern/subr_bus_dma.c 249538 2013-04-16 07:11:52Z kib $"); 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 M_ASSERTPKTHDR(m0); 108246713Skib 109246713Skib error = 0; 110246713Skib for (m = m0; m != NULL && error == 0; m = m->m_next) { 111246713Skib if (m->m_len > 0) { 112246713Skib error = _bus_dmamap_load_buffer(dmat, map, m->m_data, 113246713Skib m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF, 114246713Skib segs, nsegs); 115246713Skib } 116246713Skib } 117246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 118246713Skib __func__, dmat, flags, error, *nsegs); 119246713Skib return (error); 120246713Skib} 121246713Skib 122246713Skib/* 123246713Skib * Load from block io. 124246713Skib */ 125246713Skibstatic int 126246713Skib_bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 127246713Skib int *nsegs, int flags) 128246713Skib{ 129248508Skib vm_paddr_t paddr; 130248508Skib bus_size_t len, tlen; 131248508Skib int error, i, ma_offs; 132246713Skib 133248508Skib if ((bio->bio_flags & BIO_UNMAPPED) == 0) { 134248508Skib error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data, 135248508Skib bio->bio_bcount, kernel_pmap, flags, NULL, nsegs); 136248508Skib return (error); 137248508Skib } 138246713Skib 139248508Skib error = 0; 140248508Skib tlen = bio->bio_bcount; 141248508Skib ma_offs = bio->bio_ma_offset; 142248508Skib for (i = 0; tlen > 0; i++, tlen -= len) { 143248508Skib len = min(PAGE_SIZE - ma_offs, tlen); 144248508Skib paddr = VM_PAGE_TO_PHYS(bio->bio_ma[i]) + ma_offs; 145248508Skib error = _bus_dmamap_load_phys(dmat, map, paddr, len, 146248508Skib flags, NULL, nsegs); 147248508Skib if (error != 0) 148248508Skib break; 149248508Skib ma_offs = 0; 150248508Skib } 151246713Skib return (error); 152246713Skib} 153246713Skib 154246713Skib/* 155246713Skib * Load a cam control block. 156246713Skib */ 157246713Skibstatic int 158246713Skib_bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 159246713Skib int *nsegs, int flags) 160246713Skib{ 161246713Skib struct ccb_hdr *ccb_h; 162246713Skib void *data_ptr; 163246713Skib int error; 164246713Skib uint32_t dxfer_len; 165246713Skib uint16_t sglist_cnt; 166246713Skib 167246713Skib error = 0; 168246713Skib ccb_h = &ccb->ccb_h; 169246713Skib switch (ccb_h->func_code) { 170249025Sken case XPT_SCSI_IO: { 171249025Sken struct ccb_scsiio *csio; 172249025Sken 173246713Skib csio = &ccb->csio; 174246713Skib data_ptr = csio->data_ptr; 175246713Skib dxfer_len = csio->dxfer_len; 176246713Skib sglist_cnt = csio->sglist_cnt; 177246713Skib break; 178249025Sken } 179249025Sken case XPT_CONT_TARGET_IO: { 180249025Sken struct ccb_scsiio *ctio; 181249025Sken 182249025Sken ctio = &ccb->ctio; 183249025Sken data_ptr = ctio->data_ptr; 184249025Sken dxfer_len = ctio->dxfer_len; 185249025Sken sglist_cnt = ctio->sglist_cnt; 186249025Sken break; 187249025Sken } 188249025Sken case XPT_ATA_IO: { 189249025Sken struct ccb_ataio *ataio; 190249025Sken 191246713Skib ataio = &ccb->ataio; 192246713Skib data_ptr = ataio->data_ptr; 193246713Skib dxfer_len = ataio->dxfer_len; 194246713Skib sglist_cnt = 0; 195246713Skib break; 196249025Sken } 197246713Skib default: 198246713Skib panic("_bus_dmamap_load_ccb: Unsupported func code %d", 199246713Skib ccb_h->func_code); 200246713Skib } 201246713Skib 202246713Skib switch ((ccb_h->flags & CAM_DATA_MASK)) { 203246713Skib case CAM_DATA_VADDR: 204246713Skib error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len, 205246713Skib kernel_pmap, flags, NULL, nsegs); 206246713Skib break; 207246713Skib case CAM_DATA_PADDR: 208246713Skib error = _bus_dmamap_load_phys(dmat, map, 209246713Skib (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL, 210246713Skib nsegs); 211246713Skib break; 212246713Skib case CAM_DATA_SG: 213246713Skib error = _bus_dmamap_load_vlist(dmat, map, 214246713Skib (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap, 215246713Skib nsegs, flags); 216246713Skib break; 217246713Skib case CAM_DATA_SG_PADDR: 218246713Skib error = _bus_dmamap_load_plist(dmat, map, 219246713Skib (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags); 220246713Skib break; 221246713Skib case CAM_DATA_BIO: 222246713Skib error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr, 223246713Skib nsegs, flags); 224246713Skib break; 225246713Skib default: 226246713Skib panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented", 227246713Skib ccb_h->flags); 228246713Skib } 229246713Skib return (error); 230246713Skib} 231246713Skib 232246713Skib/* 233246713Skib * Load a uio. 234246713Skib */ 235246713Skibstatic int 236246713Skib_bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 237246713Skib int *nsegs, int flags) 238246713Skib{ 239246713Skib bus_size_t resid; 240246713Skib bus_size_t minlen; 241246713Skib struct iovec *iov; 242246713Skib pmap_t pmap; 243246713Skib caddr_t addr; 244246713Skib int error, i; 245246713Skib 246246713Skib if (uio->uio_segflg == UIO_USERSPACE) { 247246713Skib KASSERT(uio->uio_td != NULL, 248246713Skib ("bus_dmamap_load_uio: USERSPACE but no proc")); 249246713Skib pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 250246713Skib } else 251246713Skib pmap = kernel_pmap; 252246713Skib resid = uio->uio_resid; 253246713Skib iov = uio->uio_iov; 254246713Skib error = 0; 255246713Skib 256246713Skib for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 257246713Skib /* 258246713Skib * Now at the first iovec to load. Load each iovec 259246713Skib * until we have exhausted the residual count. 260246713Skib */ 261246713Skib 262246713Skib addr = (caddr_t) iov[i].iov_base; 263246713Skib minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len; 264246713Skib if (minlen > 0) { 265246713Skib error = _bus_dmamap_load_buffer(dmat, map, addr, 266246713Skib minlen, pmap, flags, NULL, nsegs); 267246713Skib resid -= minlen; 268246713Skib } 269246713Skib } 270246713Skib 271246713Skib return (error); 272246713Skib} 273246713Skib 274246713Skib/* 275246713Skib * Map the buffer buf into bus space using the dmamap map. 276246713Skib */ 277246713Skibint 278246713Skibbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 279246713Skib bus_size_t buflen, bus_dmamap_callback_t *callback, 280246713Skib void *callback_arg, int flags) 281246713Skib{ 282246713Skib bus_dma_segment_t *segs; 283246713Skib struct memdesc mem; 284246713Skib int error; 285246713Skib int nsegs; 286246713Skib 287246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) { 288246713Skib mem = memdesc_vaddr(buf, buflen); 289246713Skib _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 290246713Skib } 291246713Skib 292246713Skib nsegs = -1; 293246713Skib error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap, 294246713Skib flags, NULL, &nsegs); 295246713Skib nsegs++; 296246713Skib 297246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 298248892Sjimharris __func__, dmat, flags, error, nsegs); 299246713Skib 300246713Skib if (error == EINPROGRESS) 301246713Skib return (error); 302246713Skib 303246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 304246713Skib if (error) 305246713Skib (*callback)(callback_arg, segs, 0, error); 306246713Skib else 307246713Skib (*callback)(callback_arg, segs, nsegs, 0); 308246713Skib 309246713Skib /* 310246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 311248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 312246713Skib */ 313246713Skib if (error == ENOMEM) 314246713Skib return (error); 315246713Skib 316246713Skib return (0); 317246713Skib} 318246713Skib 319246713Skibint 320246713Skibbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 321246713Skib bus_dmamap_callback2_t *callback, void *callback_arg, int flags) 322246713Skib{ 323246713Skib bus_dma_segment_t *segs; 324246713Skib int nsegs, error; 325246713Skib 326246713Skib flags |= BUS_DMA_NOWAIT; 327246713Skib nsegs = -1; 328246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags); 329246713Skib ++nsegs; 330246713Skib 331246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 332246713Skib if (error) 333246713Skib (*callback)(callback_arg, segs, 0, 0, error); 334246713Skib else 335246713Skib (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error); 336246713Skib 337246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 338246713Skib __func__, dmat, flags, error, nsegs); 339246713Skib return (error); 340246713Skib} 341246713Skib 342246713Skibint 343246713Skibbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 344246713Skib bus_dma_segment_t *segs, int *nsegs, int flags) 345246713Skib{ 346246713Skib int error; 347246713Skib 348246713Skib flags |= BUS_DMA_NOWAIT; 349246713Skib *nsegs = -1; 350246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags); 351246713Skib ++*nsegs; 352246713Skib _bus_dmamap_complete(dmat, map, segs, *nsegs, error); 353246713Skib return (error); 354246713Skib} 355246713Skib 356246713Skibint 357246713Skibbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 358246713Skib bus_dmamap_callback2_t *callback, void *callback_arg, int flags) 359246713Skib{ 360246713Skib bus_dma_segment_t *segs; 361246713Skib int nsegs, error; 362246713Skib 363246713Skib flags |= BUS_DMA_NOWAIT; 364246713Skib nsegs = -1; 365246713Skib error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags); 366246713Skib nsegs++; 367246713Skib 368246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 369246713Skib if (error) 370246713Skib (*callback)(callback_arg, segs, 0, 0, error); 371246713Skib else 372246713Skib (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error); 373246713Skib 374246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 375248892Sjimharris __func__, dmat, flags, error, nsegs); 376246713Skib return (error); 377246713Skib} 378246713Skib 379246713Skibint 380246713Skibbus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 381246713Skib bus_dmamap_callback_t *callback, void *callback_arg, 382246713Skib int flags) 383246713Skib{ 384246713Skib bus_dma_segment_t *segs; 385246713Skib struct ccb_hdr *ccb_h; 386246713Skib struct memdesc mem; 387246713Skib int error; 388246713Skib int nsegs; 389246713Skib 390246713Skib ccb_h = &ccb->ccb_h; 391246713Skib if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) { 392246713Skib callback(callback_arg, NULL, 0, 0); 393246713Skib return (0); 394246713Skib } 395246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) { 396246713Skib mem = memdesc_ccb(ccb); 397246713Skib _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 398246713Skib } 399246713Skib nsegs = -1; 400246713Skib error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags); 401246713Skib nsegs++; 402248893Sjimharris 403248893Sjimharris CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 404248893Sjimharris __func__, dmat, flags, error, nsegs); 405248893Sjimharris 406246713Skib if (error == EINPROGRESS) 407246713Skib return (error); 408246713Skib 409246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 410246713Skib if (error) 411246713Skib (*callback)(callback_arg, segs, 0, error); 412246713Skib else 413246713Skib (*callback)(callback_arg, segs, nsegs, error); 414246713Skib /* 415246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 416248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 417246713Skib */ 418246713Skib if (error == ENOMEM) 419246713Skib return (error); 420246713Skib 421246713Skib return (0); 422246713Skib} 423246713Skib 424246713Skibint 425248896Sjimharrisbus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 426248896Sjimharris bus_dmamap_callback_t *callback, void *callback_arg, 427248896Sjimharris int flags) 428248896Sjimharris{ 429248896Sjimharris bus_dma_segment_t *segs; 430248896Sjimharris struct memdesc mem; 431248896Sjimharris int error; 432248896Sjimharris int nsegs; 433248896Sjimharris 434248896Sjimharris if ((flags & BUS_DMA_NOWAIT) == 0) { 435248896Sjimharris mem = memdesc_bio(bio); 436248896Sjimharris _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg); 437248896Sjimharris } 438248896Sjimharris nsegs = -1; 439248896Sjimharris error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags); 440248896Sjimharris nsegs++; 441248896Sjimharris 442248896Sjimharris CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 443248896Sjimharris __func__, dmat, flags, error, nsegs); 444248896Sjimharris 445248896Sjimharris if (error == EINPROGRESS) 446248896Sjimharris return (error); 447248896Sjimharris 448248896Sjimharris segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 449248896Sjimharris if (error) 450248896Sjimharris (*callback)(callback_arg, segs, 0, error); 451248896Sjimharris else 452248896Sjimharris (*callback)(callback_arg, segs, nsegs, error); 453248896Sjimharris /* 454248896Sjimharris * Return ENOMEM to the caller so that it can pass it up the stack. 455248896Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 456248896Sjimharris */ 457248896Sjimharris if (error == ENOMEM) 458248896Sjimharris return (error); 459248896Sjimharris 460248896Sjimharris return (0); 461248896Sjimharris} 462248896Sjimharris 463248896Sjimharrisint 464246713Skibbus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map, 465246713Skib struct memdesc *mem, bus_dmamap_callback_t *callback, 466246713Skib void *callback_arg, int flags) 467246713Skib{ 468246713Skib bus_dma_segment_t *segs; 469246713Skib int error; 470246713Skib int nsegs; 471246713Skib 472246713Skib if ((flags & BUS_DMA_NOWAIT) == 0) 473246713Skib _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg); 474246713Skib 475246713Skib nsegs = -1; 476246713Skib error = 0; 477246713Skib switch (mem->md_type) { 478246713Skib case MEMDESC_VADDR: 479246713Skib error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr, 480246713Skib mem->md_opaque, kernel_pmap, flags, NULL, &nsegs); 481246713Skib break; 482246713Skib case MEMDESC_PADDR: 483246713Skib error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr, 484246713Skib mem->md_opaque, flags, NULL, &nsegs); 485246713Skib break; 486246713Skib case MEMDESC_VLIST: 487246713Skib error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list, 488246713Skib mem->md_opaque, kernel_pmap, &nsegs, flags); 489246713Skib break; 490246713Skib case MEMDESC_PLIST: 491246713Skib error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list, 492246713Skib mem->md_opaque, &nsegs, flags); 493246713Skib break; 494246713Skib case MEMDESC_BIO: 495246713Skib error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio, 496246713Skib &nsegs, flags); 497246713Skib break; 498246713Skib case MEMDESC_UIO: 499246713Skib error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio, 500246713Skib &nsegs, flags); 501246713Skib break; 502246713Skib case MEMDESC_MBUF: 503246713Skib error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf, 504246713Skib NULL, &nsegs, flags); 505246713Skib break; 506246713Skib case MEMDESC_CCB: 507246713Skib error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs, 508246713Skib flags); 509246713Skib break; 510246713Skib } 511246713Skib nsegs++; 512246713Skib 513246713Skib CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 514248892Sjimharris __func__, dmat, flags, error, nsegs); 515246713Skib 516246713Skib if (error == EINPROGRESS) 517246713Skib return (error); 518246713Skib 519246713Skib segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error); 520246713Skib if (error) 521246713Skib (*callback)(callback_arg, segs, 0, error); 522246713Skib else 523246713Skib (*callback)(callback_arg, segs, nsegs, 0); 524246713Skib 525246713Skib /* 526246713Skib * Return ENOMEM to the caller so that it can pass it up the stack. 527248804Sjimharris * This error only happens when NOWAIT is set, so deferral is disabled. 528246713Skib */ 529246713Skib if (error == ENOMEM) 530246713Skib return (error); 531246713Skib 532246713Skib return (0); 533246713Skib} 534