subr_bus_dma.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 EMC Corp.
    5  * All rights reserved.
    6  *
    7  * Copyright (c) 1997, 1998 Justin T. Gibbs.
    8  * All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include "opt_bus.h"
   36 #include "opt_iommu.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/conf.h>
   40 #include <sys/systm.h>
   41 #include <sys/bio.h>
   42 #include <sys/bus.h>
   43 #include <sys/callout.h>
   44 #include <sys/ktr.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/memdesc.h>
   47 #include <sys/proc.h>
   48 #include <sys/uio.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_page.h>
   52 #include <vm/vm_map.h>
   53 #include <vm/pmap.h>
   54 
   55 #include <cam/cam.h>
   56 #include <cam/cam_ccb.h>
   57 
   58 #include <opencrypto/cryptodev.h>
   59 
   60 #include <machine/bus.h>
   61 
   62 /*
   63  * Load up data starting at offset within a region specified by a
   64  * list of virtual address ranges until either length or the region
   65  * are exhausted.
   66  */
   67 static int
   68 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
   69     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
   70     int flags, size_t offset, size_t length)
   71 {
   72         int error;
   73 
   74         error = 0;
   75         for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
   76                 char *addr;
   77                 size_t ds_len;
   78 
   79                 KASSERT((offset < list->ds_len),
   80                     ("Invalid mid-segment offset"));
   81                 addr = (char *)(uintptr_t)list->ds_addr + offset;
   82                 ds_len = list->ds_len - offset;
   83                 offset = 0;
   84                 if (ds_len > length)
   85                         ds_len = length;
   86                 length -= ds_len;
   87                 KASSERT((ds_len != 0), ("Segment length is zero"));
   88                 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
   89                     flags, NULL, nsegs);
   90                 if (error)
   91                         break;
   92         }
   93         return (error);
   94 }
   95 
   96 /*
   97  * Load a list of physical addresses.
   98  */
   99 static int
  100 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
  101     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
  102 {
  103         int error;
  104 
  105         error = 0;
  106         for (; sglist_cnt > 0; sglist_cnt--, list++) {
  107                 error = _bus_dmamap_load_phys(dmat, map,
  108                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
  109                     nsegs);
  110                 if (error)
  111                         break;
  112         }
  113         return (error);
  114 }
  115 
  116 /*
  117  * Load an unmapped mbuf
  118  */
  119 static int
  120 _bus_dmamap_load_mbuf_epg(bus_dma_tag_t dmat, bus_dmamap_t map,
  121     struct mbuf *m, bus_dma_segment_t *segs, int *nsegs, int flags)
  122 {
  123         int error, i, off, len, pglen, pgoff, seglen, segoff;
  124 
  125         M_ASSERTEXTPG(m);
  126 
  127         len = m->m_len;
  128         error = 0;
  129 
  130         /* Skip over any data removed from the front. */
  131         off = mtod(m, vm_offset_t);
  132 
  133         if (m->m_epg_hdrlen != 0) {
  134                 if (off >= m->m_epg_hdrlen) {
  135                         off -= m->m_epg_hdrlen;
  136                 } else {
  137                         seglen = m->m_epg_hdrlen - off;
  138                         segoff = off;
  139                         seglen = min(seglen, len);
  140                         off = 0;
  141                         len -= seglen;
  142                         error = _bus_dmamap_load_buffer(dmat, map,
  143                             &m->m_epg_hdr[segoff], seglen, kernel_pmap,
  144                             flags, segs, nsegs);
  145                 }
  146         }
  147         pgoff = m->m_epg_1st_off;
  148         for (i = 0; i < m->m_epg_npgs && error == 0 && len > 0; i++) {
  149                 pglen = m_epg_pagelen(m, i, pgoff);
  150                 if (off >= pglen) {
  151                         off -= pglen;
  152                         pgoff = 0;
  153                         continue;
  154                 }
  155                 seglen = pglen - off;
  156                 segoff = pgoff + off;
  157                 off = 0;
  158                 seglen = min(seglen, len);
  159                 len -= seglen;
  160                 error = _bus_dmamap_load_phys(dmat, map,
  161                     m->m_epg_pa[i] + segoff, seglen, flags, segs, nsegs);
  162                 pgoff = 0;
  163         };
  164         if (len != 0 && error == 0) {
  165                 KASSERT((off + len) <= m->m_epg_trllen,
  166                     ("off + len > trail (%d + %d > %d)", off, len,
  167                     m->m_epg_trllen));
  168                 error = _bus_dmamap_load_buffer(dmat, map,
  169                     &m->m_epg_trail[off], len, kernel_pmap, flags, segs,
  170                     nsegs);
  171         }
  172         return (error);
  173 }
  174 
  175 /*
  176  * Load a single mbuf.
  177  */
  178 static int
  179 _bus_dmamap_load_single_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
  180     struct mbuf *m, bus_dma_segment_t *segs, int *nsegs, int flags)
  181 {
  182         int error;
  183 
  184         error = 0;
  185         if ((m->m_flags & M_EXTPG) != 0)
  186                 error = _bus_dmamap_load_mbuf_epg(dmat, map, m, segs, nsegs,
  187                     flags);
  188         else
  189                 error = _bus_dmamap_load_buffer(dmat, map, m->m_data, m->m_len,
  190                     kernel_pmap, flags | BUS_DMA_LOAD_MBUF, segs, nsegs);
  191         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  192             __func__, dmat, flags, error, *nsegs);
  193         return (error);
  194 }
  195 
  196 /*
  197  * Load an mbuf chain.
  198  */
  199 static int
  200 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  201     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  202 {
  203         struct mbuf *m;
  204         int error;
  205 
  206         error = 0;
  207         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  208                 if (m->m_len > 0) {
  209                         if ((m->m_flags & M_EXTPG) != 0)
  210                                 error = _bus_dmamap_load_mbuf_epg(dmat,
  211                                     map, m, segs, nsegs, flags);
  212                         else
  213                                 error = _bus_dmamap_load_buffer(dmat, map,
  214                                     m->m_data, m->m_len, kernel_pmap,
  215                                     flags | BUS_DMA_LOAD_MBUF, segs, nsegs);
  216                 }
  217         }
  218         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  219             __func__, dmat, flags, error, *nsegs);
  220         return (error);
  221 }
  222 
  223 /*
  224  * Load from block io.
  225  */
  226 static int
  227 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  228     int *nsegs, int flags)
  229 {
  230 
  231         if ((bio->bio_flags & BIO_VLIST) != 0) {
  232                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
  233                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
  234                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
  235                     bio->bio_bcount));
  236         }
  237 
  238         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
  239                 return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  240                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
  241 
  242         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  243             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
  244 }
  245 
  246 int
  247 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  248     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  249     bus_dma_segment_t *segs, int *segp)
  250 {
  251         vm_paddr_t paddr;
  252         bus_size_t len;
  253         int error, i;
  254 
  255         error = 0;
  256         for (i = 0; tlen > 0; i++, tlen -= len) {
  257                 len = min(PAGE_SIZE - ma_offs, tlen);
  258                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  259                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  260                     flags, segs, segp);
  261                 if (error != 0)
  262                         break;
  263                 ma_offs = 0;
  264         }
  265         return (error);
  266 }
  267 
  268 /*
  269  * Load a cam control block.
  270  */
  271 static int
  272 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  273                     int *nsegs, int flags)
  274 {
  275         struct ccb_hdr *ccb_h;
  276         void *data_ptr;
  277         int error;
  278         uint32_t dxfer_len;
  279         uint16_t sglist_cnt;
  280 
  281         error = 0;
  282         ccb_h = &ccb->ccb_h;
  283         switch (ccb_h->func_code) {
  284         case XPT_SCSI_IO: {
  285                 struct ccb_scsiio *csio;
  286 
  287                 csio = &ccb->csio;
  288                 data_ptr = csio->data_ptr;
  289                 dxfer_len = csio->dxfer_len;
  290                 sglist_cnt = csio->sglist_cnt;
  291                 break;
  292         }
  293         case XPT_CONT_TARGET_IO: {
  294                 struct ccb_scsiio *ctio;
  295 
  296                 ctio = &ccb->ctio;
  297                 data_ptr = ctio->data_ptr;
  298                 dxfer_len = ctio->dxfer_len;
  299                 sglist_cnt = ctio->sglist_cnt;
  300                 break;
  301         }
  302         case XPT_ATA_IO: {
  303                 struct ccb_ataio *ataio;
  304 
  305                 ataio = &ccb->ataio;
  306                 data_ptr = ataio->data_ptr;
  307                 dxfer_len = ataio->dxfer_len;
  308                 sglist_cnt = 0;
  309                 break;
  310         }
  311         case XPT_NVME_IO:
  312         case XPT_NVME_ADMIN: {
  313                 struct ccb_nvmeio *nvmeio;
  314 
  315                 nvmeio = &ccb->nvmeio;
  316                 data_ptr = nvmeio->data_ptr;
  317                 dxfer_len = nvmeio->dxfer_len;
  318                 sglist_cnt = nvmeio->sglist_cnt;
  319                 break;
  320         }
  321         default:
  322                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  323                     ccb_h->func_code);
  324         }
  325 
  326         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  327         case CAM_DATA_VADDR:
  328                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  329                     kernel_pmap, flags, NULL, nsegs);
  330                 break;
  331         case CAM_DATA_PADDR:
  332                 error = _bus_dmamap_load_phys(dmat, map,
  333                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  334                     nsegs);
  335                 break;
  336         case CAM_DATA_SG:
  337                 error = _bus_dmamap_load_vlist(dmat, map,
  338                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  339                     nsegs, flags, 0, dxfer_len);
  340                 break;
  341         case CAM_DATA_SG_PADDR:
  342                 error = _bus_dmamap_load_plist(dmat, map,
  343                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  344                 break;
  345         case CAM_DATA_BIO:
  346                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  347                     nsegs, flags);
  348                 break;
  349         default:
  350                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  351                     ccb_h->flags);
  352         }
  353         return (error);
  354 }
  355 
  356 /*
  357  * Load a uio.
  358  */
  359 static int
  360 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  361     int *nsegs, int flags)
  362 {
  363         bus_size_t resid;
  364         bus_size_t minlen;
  365         struct iovec *iov;
  366         pmap_t pmap;
  367         caddr_t addr;
  368         int error, i;
  369 
  370         if (uio->uio_segflg == UIO_USERSPACE) {
  371                 KASSERT(uio->uio_td != NULL,
  372                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  373                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  374         } else
  375                 pmap = kernel_pmap;
  376         resid = uio->uio_resid;
  377         iov = uio->uio_iov;
  378         error = 0;
  379 
  380         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  381                 /*
  382                  * Now at the first iovec to load.  Load each iovec
  383                  * until we have exhausted the residual count.
  384                  */
  385 
  386                 addr = (caddr_t) iov[i].iov_base;
  387                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  388                 if (minlen > 0) {
  389                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  390                             minlen, pmap, flags, NULL, nsegs);
  391                         resid -= minlen;
  392                 }
  393         }
  394 
  395         return (error);
  396 }
  397 
  398 /*
  399  * Map the buffer buf into bus space using the dmamap map.
  400  */
  401 int
  402 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  403     bus_size_t buflen, bus_dmamap_callback_t *callback,
  404     void *callback_arg, int flags)
  405 {
  406         bus_dma_segment_t *segs;
  407         struct memdesc mem;
  408         int error;
  409         int nsegs;
  410 
  411         if ((flags & BUS_DMA_NOWAIT) == 0) {
  412                 mem = memdesc_vaddr(buf, buflen);
  413                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  414         }
  415 
  416         nsegs = -1;
  417         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  418             flags, NULL, &nsegs);
  419         nsegs++;
  420 
  421         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  422             __func__, dmat, flags, error, nsegs);
  423 
  424         if (error == EINPROGRESS)
  425                 return (error);
  426 
  427         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  428         if (error)
  429                 (*callback)(callback_arg, segs, 0, error);
  430         else
  431                 (*callback)(callback_arg, segs, nsegs, 0);
  432 
  433         /*
  434          * Return ENOMEM to the caller so that it can pass it up the stack.
  435          * This error only happens when NOWAIT is set, so deferral is disabled.
  436          */
  437         if (error == ENOMEM)
  438                 return (error);
  439 
  440         return (0);
  441 }
  442 
  443 int
  444 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  445     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  446 {
  447         bus_dma_segment_t *segs;
  448         int nsegs, error;
  449 
  450         M_ASSERTPKTHDR(m0);
  451 
  452         flags |= BUS_DMA_NOWAIT;
  453         nsegs = -1;
  454         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  455         ++nsegs;
  456 
  457         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  458         if (error)
  459                 (*callback)(callback_arg, segs, 0, 0, error);
  460         else
  461                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  462 
  463         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  464             __func__, dmat, flags, error, nsegs);
  465         return (error);
  466 }
  467 
  468 int
  469 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  470     bus_dma_segment_t *segs, int *nsegs, int flags)
  471 {
  472         int error;
  473 
  474         flags |= BUS_DMA_NOWAIT;
  475         *nsegs = -1;
  476         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  477         ++*nsegs;
  478         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  479         return (error);
  480 }
  481 
  482 int
  483 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  484     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  485 {
  486         bus_dma_segment_t *segs;
  487         int nsegs, error;
  488 
  489         flags |= BUS_DMA_NOWAIT;
  490         nsegs = -1;
  491         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  492         nsegs++;
  493 
  494         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  495         if (error)
  496                 (*callback)(callback_arg, segs, 0, 0, error);
  497         else
  498                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  499 
  500         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  501             __func__, dmat, flags, error, nsegs);
  502         return (error);
  503 }
  504 
  505 int
  506 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  507                     bus_dmamap_callback_t *callback, void *callback_arg,
  508                     int flags)
  509 {
  510         bus_dma_segment_t *segs;
  511         struct ccb_hdr *ccb_h;
  512         struct memdesc mem;
  513         int error;
  514         int nsegs;
  515 
  516         ccb_h = &ccb->ccb_h;
  517         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  518                 callback(callback_arg, NULL, 0, 0);
  519                 return (0);
  520         }
  521         if ((flags & BUS_DMA_NOWAIT) == 0) {
  522                 mem = memdesc_ccb(ccb);
  523                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  524         }
  525         nsegs = -1;
  526         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  527         nsegs++;
  528 
  529         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  530             __func__, dmat, flags, error, nsegs);
  531 
  532         if (error == EINPROGRESS)
  533                 return (error);
  534 
  535         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  536         if (error)
  537                 (*callback)(callback_arg, segs, 0, error);
  538         else
  539                 (*callback)(callback_arg, segs, nsegs, error);
  540         /*
  541          * Return ENOMEM to the caller so that it can pass it up the stack.
  542          * This error only happens when NOWAIT is set, so deferral is disabled.
  543          */
  544         if (error == ENOMEM)
  545                 return (error);
  546 
  547         return (0);
  548 }
  549 
  550 int
  551 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  552                     bus_dmamap_callback_t *callback, void *callback_arg,
  553                     int flags)
  554 {
  555         bus_dma_segment_t *segs;
  556         struct memdesc mem;
  557         int error;
  558         int nsegs;
  559 
  560         if ((flags & BUS_DMA_NOWAIT) == 0) {
  561                 mem = memdesc_bio(bio);
  562                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  563         }
  564         nsegs = -1;
  565         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  566         nsegs++;
  567 
  568         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  569             __func__, dmat, flags, error, nsegs);
  570 
  571         if (error == EINPROGRESS)
  572                 return (error);
  573 
  574         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  575         if (error)
  576                 (*callback)(callback_arg, segs, 0, error);
  577         else
  578                 (*callback)(callback_arg, segs, nsegs, error);
  579         /*
  580          * Return ENOMEM to the caller so that it can pass it up the stack.
  581          * This error only happens when NOWAIT is set, so deferral is disabled.
  582          */
  583         if (error == ENOMEM)
  584                 return (error);
  585 
  586         return (0);
  587 }
  588 
  589 int
  590 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  591     struct memdesc *mem, bus_dmamap_callback_t *callback,
  592     void *callback_arg, int flags)
  593 {
  594         bus_dma_segment_t *segs;
  595         int error;
  596         int nsegs;
  597 
  598         if ((flags & BUS_DMA_NOWAIT) == 0)
  599                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  600 
  601         nsegs = -1;
  602         error = 0;
  603         switch (mem->md_type) {
  604         case MEMDESC_VADDR:
  605                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  606                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  607                 break;
  608         case MEMDESC_PADDR:
  609                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  610                     mem->md_opaque, flags, NULL, &nsegs);
  611                 break;
  612         case MEMDESC_VLIST:
  613                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  614                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
  615                 break;
  616         case MEMDESC_PLIST:
  617                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  618                     mem->md_opaque, &nsegs, flags);
  619                 break;
  620         case MEMDESC_BIO:
  621                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  622                     &nsegs, flags);
  623                 break;
  624         case MEMDESC_UIO:
  625                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  626                     &nsegs, flags);
  627                 break;
  628         case MEMDESC_MBUF:
  629                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  630                     NULL, &nsegs, flags);
  631                 break;
  632         case MEMDESC_CCB:
  633                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  634                     flags);
  635                 break;
  636         }
  637         nsegs++;
  638 
  639         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  640             __func__, dmat, flags, error, nsegs);
  641 
  642         if (error == EINPROGRESS)
  643                 return (error);
  644 
  645         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  646         if (error)
  647                 (*callback)(callback_arg, segs, 0, error);
  648         else
  649                 (*callback)(callback_arg, segs, nsegs, 0);
  650 
  651         /*
  652          * Return ENOMEM to the caller so that it can pass it up the stack.
  653          * This error only happens when NOWAIT is set, so deferral is disabled.
  654          */
  655         if (error == ENOMEM)
  656                 return (error);
  657 
  658         return (0);
  659 }
  660 
  661 int
  662 bus_dmamap_load_crp_buffer(bus_dma_tag_t dmat, bus_dmamap_t map,
  663     struct crypto_buffer *cb, bus_dmamap_callback_t *callback,
  664     void *callback_arg, int flags)
  665 {
  666         bus_dma_segment_t *segs;
  667         int error;
  668         int nsegs;
  669 
  670         flags |= BUS_DMA_NOWAIT;
  671         nsegs = -1;
  672         error = 0;
  673         switch (cb->cb_type) {
  674         case CRYPTO_BUF_CONTIG:
  675                 error = _bus_dmamap_load_buffer(dmat, map, cb->cb_buf,
  676                     cb->cb_buf_len, kernel_pmap, flags, NULL, &nsegs);
  677                 break;
  678         case CRYPTO_BUF_MBUF:
  679                 error = _bus_dmamap_load_mbuf_sg(dmat, map, cb->cb_mbuf,
  680                     NULL, &nsegs, flags);
  681                 break;
  682         case CRYPTO_BUF_SINGLE_MBUF:
  683                 error = _bus_dmamap_load_single_mbuf(dmat, map, cb->cb_mbuf,
  684                     NULL, &nsegs, flags);
  685                 break;
  686         case CRYPTO_BUF_UIO:
  687                 error = _bus_dmamap_load_uio(dmat, map, cb->cb_uio, &nsegs,
  688                     flags);
  689                 break;
  690         case CRYPTO_BUF_VMPAGE:
  691                 error = _bus_dmamap_load_ma(dmat, map, cb->cb_vm_page,
  692                     cb->cb_vm_page_len, cb->cb_vm_page_offset, flags, NULL,
  693                     &nsegs);
  694                 break;
  695         default:
  696                 error = EINVAL;
  697         }
  698         nsegs++;
  699 
  700         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  701             __func__, dmat, flags, error, nsegs);
  702 
  703         if (error == EINPROGRESS)
  704                 return (error);
  705 
  706         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  707         if (error)
  708                 (*callback)(callback_arg, segs, 0, error);
  709         else
  710                 (*callback)(callback_arg, segs, nsegs, 0);
  711 
  712         /*
  713          * Return ENOMEM to the caller so that it can pass it up the stack.
  714          * This error only happens when NOWAIT is set, so deferral is disabled.
  715          */
  716         if (error == ENOMEM)
  717                 return (error);
  718 
  719         return (0);
  720 }
  721 
  722 int
  723 bus_dmamap_load_crp(bus_dma_tag_t dmat, bus_dmamap_t map, struct cryptop *crp,
  724     bus_dmamap_callback_t *callback, void *callback_arg, int flags)
  725 {
  726         return (bus_dmamap_load_crp_buffer(dmat, map, &crp->crp_buf, callback,
  727             callback_arg, flags));
  728 }
  729 
  730 void
  731 bus_dma_template_init(bus_dma_template_t *t, bus_dma_tag_t parent)
  732 {
  733 
  734         if (t == NULL)
  735                 return;
  736 
  737         t->parent = parent;
  738         t->alignment = 1;
  739         t->boundary = 0;
  740         t->lowaddr = t->highaddr = BUS_SPACE_MAXADDR;
  741         t->maxsize = t->maxsegsize = BUS_SPACE_MAXSIZE;
  742         t->nsegments = BUS_SPACE_UNRESTRICTED;
  743         t->lockfunc = NULL;
  744         t->lockfuncarg = NULL;
  745         t->flags = 0;
  746 }
  747 
  748 int
  749 bus_dma_template_tag(bus_dma_template_t *t, bus_dma_tag_t *dmat)
  750 {
  751 
  752         if (t == NULL || dmat == NULL)
  753                 return (EINVAL);
  754 
  755         return (bus_dma_tag_create(t->parent, t->alignment, t->boundary,
  756             t->lowaddr, t->highaddr, NULL, NULL, t->maxsize,
  757             t->nsegments, t->maxsegsize, t->flags, t->lockfunc, t->lockfuncarg,
  758             dmat));
  759 }
  760 
  761 void
  762 bus_dma_template_fill(bus_dma_template_t *t, bus_dma_param_t *kv, u_int count)
  763 {
  764         bus_dma_param_t *pkv;
  765 
  766         while (count) {
  767                 pkv = &kv[--count];
  768                 switch (pkv->key) {
  769                 case BD_PARAM_PARENT:
  770                         t->parent = pkv->ptr;
  771                         break;
  772                 case BD_PARAM_ALIGNMENT:
  773                         t->alignment = pkv->num;
  774                         break;
  775                 case BD_PARAM_BOUNDARY:
  776                         t->boundary = pkv->num;
  777                         break;
  778                 case BD_PARAM_LOWADDR:
  779                         t->lowaddr = pkv->pa;
  780                         break;
  781                 case BD_PARAM_HIGHADDR:
  782                         t->highaddr = pkv->pa;
  783                         break;
  784                 case BD_PARAM_MAXSIZE:
  785                         t->maxsize = pkv->num;
  786                         break;
  787                 case BD_PARAM_NSEGMENTS:
  788                         t->nsegments = pkv->num;
  789                         break;
  790                 case BD_PARAM_MAXSEGSIZE:
  791                         t->maxsegsize = pkv->num;
  792                         break;
  793                 case BD_PARAM_FLAGS:
  794                         t->flags = pkv->num;
  795                         break;
  796                 case BD_PARAM_LOCKFUNC:
  797                         t->lockfunc = pkv->ptr;
  798                         break;
  799                 case BD_PARAM_LOCKFUNCARG:
  800                         t->lockfuncarg = pkv->ptr;
  801                         break;
  802                 case BD_PARAM_NAME:
  803                         t->name = pkv->ptr;
  804                         break;
  805                 case BD_PARAM_INVALID:
  806                 default:
  807                         KASSERT(0, ("Invalid key %d\n", pkv->key));
  808                         break;
  809                 }
  810         }
  811         return;
  812 }
  813 
  814 #ifndef IOMMU
  815 bool bus_dma_iommu_set_buswide(device_t dev);
  816 int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  817     vm_paddr_t start, vm_size_t length, int flags);
  818 
  819 bool
  820 bus_dma_iommu_set_buswide(device_t dev)
  821 {
  822         return (false);
  823 }
  824 
  825 int
  826 bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  827     vm_paddr_t start, vm_size_t length, int flags)
  828 {
  829         return (0);
  830 }
  831 #endif
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_bus_dma.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_bus_dma.c
