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 an mbuf chain.
  177  */
  178 static int
  179 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  180     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  181 {
  182         struct mbuf *m;
  183         int error;
  184 
  185         error = 0;
  186         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  187                 if (m->m_len > 0) {
  188                         if ((m->m_flags & M_EXTPG) != 0)
  189                                 error = _bus_dmamap_load_mbuf_epg(dmat,
  190                                     map, m, segs, nsegs, flags);
  191                         else
  192                                 error = _bus_dmamap_load_buffer(dmat, map,
  193                                     m->m_data, m->m_len, kernel_pmap,
  194                                     flags | BUS_DMA_LOAD_MBUF, segs, nsegs);
  195                 }
  196         }
  197         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  198             __func__, dmat, flags, error, *nsegs);
  199         return (error);
  200 }
  201 
  202 /*
  203  * Load from block io.
  204  */
  205 static int
  206 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  207     int *nsegs, int flags)
  208 {
  209 
  210         if ((bio->bio_flags & BIO_VLIST) != 0) {
  211                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
  212                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
  213                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
  214                     bio->bio_bcount));
  215         }
  216 
  217         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
  218                 return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  219                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
  220 
  221         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  222             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
  223 }
  224 
  225 int
  226 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  227     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  228     bus_dma_segment_t *segs, int *segp)
  229 {
  230         vm_paddr_t paddr;
  231         bus_size_t len;
  232         int error, i;
  233 
  234         error = 0;
  235         for (i = 0; tlen > 0; i++, tlen -= len) {
  236                 len = min(PAGE_SIZE - ma_offs, tlen);
  237                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  238                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  239                     flags, segs, segp);
  240                 if (error != 0)
  241                         break;
  242                 ma_offs = 0;
  243         }
  244         return (error);
  245 }
  246 
  247 /*
  248  * Load a cam control block.
  249  */
  250 static int
  251 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  252                     int *nsegs, int flags)
  253 {
  254         struct ccb_hdr *ccb_h;
  255         void *data_ptr;
  256         int error;
  257         uint32_t dxfer_len;
  258         uint16_t sglist_cnt;
  259 
  260         error = 0;
  261         ccb_h = &ccb->ccb_h;
  262         switch (ccb_h->func_code) {
  263         case XPT_SCSI_IO: {
  264                 struct ccb_scsiio *csio;
  265 
  266                 csio = &ccb->csio;
  267                 data_ptr = csio->data_ptr;
  268                 dxfer_len = csio->dxfer_len;
  269                 sglist_cnt = csio->sglist_cnt;
  270                 break;
  271         }
  272         case XPT_CONT_TARGET_IO: {
  273                 struct ccb_scsiio *ctio;
  274 
  275                 ctio = &ccb->ctio;
  276                 data_ptr = ctio->data_ptr;
  277                 dxfer_len = ctio->dxfer_len;
  278                 sglist_cnt = ctio->sglist_cnt;
  279                 break;
  280         }
  281         case XPT_ATA_IO: {
  282                 struct ccb_ataio *ataio;
  283 
  284                 ataio = &ccb->ataio;
  285                 data_ptr = ataio->data_ptr;
  286                 dxfer_len = ataio->dxfer_len;
  287                 sglist_cnt = 0;
  288                 break;
  289         }
  290         case XPT_NVME_IO:
  291         case XPT_NVME_ADMIN: {
  292                 struct ccb_nvmeio *nvmeio;
  293 
  294                 nvmeio = &ccb->nvmeio;
  295                 data_ptr = nvmeio->data_ptr;
  296                 dxfer_len = nvmeio->dxfer_len;
  297                 sglist_cnt = nvmeio->sglist_cnt;
  298                 break;
  299         }
  300         default:
  301                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  302                     ccb_h->func_code);
  303         }
  304 
  305         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  306         case CAM_DATA_VADDR:
  307                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  308                     kernel_pmap, flags, NULL, nsegs);
  309                 break;
  310         case CAM_DATA_PADDR:
  311                 error = _bus_dmamap_load_phys(dmat, map,
  312                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  313                     nsegs);
  314                 break;
  315         case CAM_DATA_SG:
  316                 error = _bus_dmamap_load_vlist(dmat, map,
  317                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  318                     nsegs, flags, 0, dxfer_len);
  319                 break;
  320         case CAM_DATA_SG_PADDR:
  321                 error = _bus_dmamap_load_plist(dmat, map,
  322                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  323                 break;
  324         case CAM_DATA_BIO:
  325                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  326                     nsegs, flags);
  327                 break;
  328         default:
  329                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  330                     ccb_h->flags);
  331         }
  332         return (error);
  333 }
  334 
  335 /*
  336  * Load a uio.
  337  */
  338 static int
  339 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  340     int *nsegs, int flags)
  341 {
  342         bus_size_t resid;
  343         bus_size_t minlen;
  344         struct iovec *iov;
  345         pmap_t pmap;
  346         caddr_t addr;
  347         int error, i;
  348 
  349         if (uio->uio_segflg == UIO_USERSPACE) {
  350                 KASSERT(uio->uio_td != NULL,
  351                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  352                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  353         } else
  354                 pmap = kernel_pmap;
  355         resid = uio->uio_resid;
  356         iov = uio->uio_iov;
  357         error = 0;
  358 
  359         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  360                 /*
  361                  * Now at the first iovec to load.  Load each iovec
  362                  * until we have exhausted the residual count.
  363                  */
  364 
  365                 addr = (caddr_t) iov[i].iov_base;
  366                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  367                 if (minlen > 0) {
  368                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  369                             minlen, pmap, flags, NULL, nsegs);
  370                         resid -= minlen;
  371                 }
  372         }
  373 
  374         return (error);
  375 }
  376 
  377 /*
  378  * Map the buffer buf into bus space using the dmamap map.
  379  */
  380 int
  381 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  382     bus_size_t buflen, bus_dmamap_callback_t *callback,
  383     void *callback_arg, int flags)
  384 {
  385         bus_dma_segment_t *segs;
  386         struct memdesc mem;
  387         int error;
  388         int nsegs;
  389 
  390         if ((flags & BUS_DMA_NOWAIT) == 0) {
  391                 mem = memdesc_vaddr(buf, buflen);
  392                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  393         }
  394 
  395         nsegs = -1;
  396         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  397             flags, NULL, &nsegs);
  398         nsegs++;
  399 
  400         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  401             __func__, dmat, flags, error, nsegs);
  402 
  403         if (error == EINPROGRESS)
  404                 return (error);
  405 
  406         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  407         if (error)
  408                 (*callback)(callback_arg, segs, 0, error);
  409         else
  410                 (*callback)(callback_arg, segs, nsegs, 0);
  411 
  412         /*
  413          * Return ENOMEM to the caller so that it can pass it up the stack.
  414          * This error only happens when NOWAIT is set, so deferral is disabled.
  415          */
  416         if (error == ENOMEM)
  417                 return (error);
  418 
  419         return (0);
  420 }
  421 
  422 int
  423 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  424     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  425 {
  426         bus_dma_segment_t *segs;
  427         int nsegs, error;
  428 
  429         M_ASSERTPKTHDR(m0);
  430 
  431         flags |= BUS_DMA_NOWAIT;
  432         nsegs = -1;
  433         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  434         ++nsegs;
  435 
  436         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  437         if (error)
  438                 (*callback)(callback_arg, segs, 0, 0, error);
  439         else
  440                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  441 
  442         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  443             __func__, dmat, flags, error, nsegs);
  444         return (error);
  445 }
  446 
  447 int
  448 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  449     bus_dma_segment_t *segs, int *nsegs, int flags)
  450 {
  451         int error;
  452 
  453         flags |= BUS_DMA_NOWAIT;
  454         *nsegs = -1;
  455         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  456         ++*nsegs;
  457         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  458         return (error);
  459 }
  460 
  461 int
  462 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  463     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  464 {
  465         bus_dma_segment_t *segs;
  466         int nsegs, error;
  467 
  468         flags |= BUS_DMA_NOWAIT;
  469         nsegs = -1;
  470         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  471         nsegs++;
  472 
  473         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  474         if (error)
  475                 (*callback)(callback_arg, segs, 0, 0, error);
  476         else
  477                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  478 
  479         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  480             __func__, dmat, flags, error, nsegs);
  481         return (error);
  482 }
  483 
  484 int
  485 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  486                     bus_dmamap_callback_t *callback, void *callback_arg,
  487                     int flags)
  488 {
  489         bus_dma_segment_t *segs;
  490         struct ccb_hdr *ccb_h;
  491         struct memdesc mem;
  492         int error;
  493         int nsegs;
  494 
  495         ccb_h = &ccb->ccb_h;
  496         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  497                 callback(callback_arg, NULL, 0, 0);
  498                 return (0);
  499         }
  500         if ((flags & BUS_DMA_NOWAIT) == 0) {
  501                 mem = memdesc_ccb(ccb);
  502                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  503         }
  504         nsegs = -1;
  505         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  506         nsegs++;
  507 
  508         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  509             __func__, dmat, flags, error, nsegs);
  510 
  511         if (error == EINPROGRESS)
  512                 return (error);
  513 
  514         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  515         if (error)
  516                 (*callback)(callback_arg, segs, 0, error);
  517         else
  518                 (*callback)(callback_arg, segs, nsegs, error);
  519         /*
  520          * Return ENOMEM to the caller so that it can pass it up the stack.
  521          * This error only happens when NOWAIT is set, so deferral is disabled.
  522          */
  523         if (error == ENOMEM)
  524                 return (error);
  525 
  526         return (0);
  527 }
  528 
  529 int
  530 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  531                     bus_dmamap_callback_t *callback, void *callback_arg,
  532                     int flags)
  533 {
  534         bus_dma_segment_t *segs;
  535         struct memdesc mem;
  536         int error;
  537         int nsegs;
  538 
  539         if ((flags & BUS_DMA_NOWAIT) == 0) {
  540                 mem = memdesc_bio(bio);
  541                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  542         }
  543         nsegs = -1;
  544         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  545         nsegs++;
  546 
  547         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  548             __func__, dmat, flags, error, nsegs);
  549 
  550         if (error == EINPROGRESS)
  551                 return (error);
  552 
  553         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  554         if (error)
  555                 (*callback)(callback_arg, segs, 0, error);
  556         else
  557                 (*callback)(callback_arg, segs, nsegs, error);
  558         /*
  559          * Return ENOMEM to the caller so that it can pass it up the stack.
  560          * This error only happens when NOWAIT is set, so deferral is disabled.
  561          */
  562         if (error == ENOMEM)
  563                 return (error);
  564 
  565         return (0);
  566 }
  567 
  568 int
  569 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  570     struct memdesc *mem, bus_dmamap_callback_t *callback,
  571     void *callback_arg, int flags)
  572 {
  573         bus_dma_segment_t *segs;
  574         int error;
  575         int nsegs;
  576 
  577         if ((flags & BUS_DMA_NOWAIT) == 0)
  578                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  579 
  580         nsegs = -1;
  581         error = 0;
  582         switch (mem->md_type) {
  583         case MEMDESC_VADDR:
  584                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  585                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  586                 break;
  587         case MEMDESC_PADDR:
  588                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  589                     mem->md_opaque, flags, NULL, &nsegs);
  590                 break;
  591         case MEMDESC_VLIST:
  592                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  593                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
  594                 break;
  595         case MEMDESC_PLIST:
  596                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  597                     mem->md_opaque, &nsegs, flags);
  598                 break;
  599         case MEMDESC_BIO:
  600                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  601                     &nsegs, flags);
  602                 break;
  603         case MEMDESC_UIO:
  604                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  605                     &nsegs, flags);
  606                 break;
  607         case MEMDESC_MBUF:
  608                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  609                     NULL, &nsegs, flags);
  610                 break;
  611         case MEMDESC_CCB:
  612                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  613                     flags);
  614                 break;
  615         }
  616         nsegs++;
  617 
  618         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  619             __func__, dmat, flags, error, nsegs);
  620 
  621         if (error == EINPROGRESS)
  622                 return (error);
  623 
  624         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  625         if (error)
  626                 (*callback)(callback_arg, segs, 0, error);
  627         else
  628                 (*callback)(callback_arg, segs, nsegs, 0);
  629 
  630         /*
  631          * Return ENOMEM to the caller so that it can pass it up the stack.
  632          * This error only happens when NOWAIT is set, so deferral is disabled.
  633          */
  634         if (error == ENOMEM)
  635                 return (error);
  636 
  637         return (0);
  638 }
  639 
  640 int
  641 bus_dmamap_load_crp_buffer(bus_dma_tag_t dmat, bus_dmamap_t map,
  642     struct crypto_buffer *cb, bus_dmamap_callback_t *callback,
  643     void *callback_arg, int flags)
  644 {
  645         bus_dma_segment_t *segs;
  646         int error;
  647         int nsegs;
  648 
  649         flags |= BUS_DMA_NOWAIT;
  650         nsegs = -1;
  651         error = 0;
  652         switch (cb->cb_type) {
  653         case CRYPTO_BUF_CONTIG:
  654                 error = _bus_dmamap_load_buffer(dmat, map, cb->cb_buf,
  655                     cb->cb_buf_len, kernel_pmap, flags, NULL, &nsegs);
  656                 break;
  657         case CRYPTO_BUF_MBUF:
  658                 error = _bus_dmamap_load_mbuf_sg(dmat, map, cb->cb_mbuf,
  659                     NULL, &nsegs, flags);
  660                 break;
  661         case CRYPTO_BUF_UIO:
  662                 error = _bus_dmamap_load_uio(dmat, map, cb->cb_uio, &nsegs,
  663                     flags);
  664                 break;
  665         case CRYPTO_BUF_VMPAGE:
  666                 error = _bus_dmamap_load_ma(dmat, map, cb->cb_vm_page,
  667                     cb->cb_vm_page_len, cb->cb_vm_page_offset, flags, NULL,
  668                     &nsegs);
  669                 break;
  670         default:
  671                 error = EINVAL;
  672         }
  673         nsegs++;
  674 
  675         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  676             __func__, dmat, flags, error, nsegs);
  677 
  678         if (error == EINPROGRESS)
  679                 return (error);
  680 
  681         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  682         if (error)
  683                 (*callback)(callback_arg, segs, 0, error);
  684         else
  685                 (*callback)(callback_arg, segs, nsegs, 0);
  686 
  687         /*
  688          * Return ENOMEM to the caller so that it can pass it up the stack.
  689          * This error only happens when NOWAIT is set, so deferral is disabled.
  690          */
  691         if (error == ENOMEM)
  692                 return (error);
  693 
  694         return (0);
  695 }
  696 
  697 int
  698 bus_dmamap_load_crp(bus_dma_tag_t dmat, bus_dmamap_t map, struct cryptop *crp,
  699     bus_dmamap_callback_t *callback, void *callback_arg, int flags)
  700 {
  701         return (bus_dmamap_load_crp_buffer(dmat, map, &crp->crp_buf, callback,
  702             callback_arg, flags));
  703 }
  704 
  705 void
  706 bus_dma_template_init(bus_dma_template_t *t, bus_dma_tag_t parent)
  707 {
  708 
  709         if (t == NULL)
  710                 return;
  711 
  712         t->parent = parent;
  713         t->alignment = 1;
  714         t->boundary = 0;
  715         t->lowaddr = t->highaddr = BUS_SPACE_MAXADDR;
  716         t->maxsize = t->maxsegsize = BUS_SPACE_MAXSIZE;
  717         t->nsegments = BUS_SPACE_UNRESTRICTED;
  718         t->lockfunc = NULL;
  719         t->lockfuncarg = NULL;
  720         t->flags = 0;
  721 }
  722 
  723 int
  724 bus_dma_template_tag(bus_dma_template_t *t, bus_dma_tag_t *dmat)
  725 {
  726 
  727         if (t == NULL || dmat == NULL)
  728                 return (EINVAL);
  729 
  730         return (bus_dma_tag_create(t->parent, t->alignment, t->boundary,
  731             t->lowaddr, t->highaddr, NULL, NULL, t->maxsize,
  732             t->nsegments, t->maxsegsize, t->flags, t->lockfunc, t->lockfuncarg,
  733             dmat));
  734 }
  735 
  736 void
  737 bus_dma_template_fill(bus_dma_template_t *t, bus_dma_param_t *kv, u_int count)
  738 {
  739         bus_dma_param_t *pkv;
  740 
  741         while (count) {
  742                 pkv = &kv[--count];
  743                 switch (pkv->key) {
  744                 case BD_PARAM_PARENT:
  745                         t->parent = pkv->ptr;
  746                         break;
  747                 case BD_PARAM_ALIGNMENT:
  748                         t->alignment = pkv->num;
  749                         break;
  750                 case BD_PARAM_BOUNDARY:
  751                         t->boundary = pkv->num;
  752                         break;
  753                 case BD_PARAM_LOWADDR:
  754                         t->lowaddr = pkv->pa;
  755                         break;
  756                 case BD_PARAM_HIGHADDR:
  757                         t->highaddr = pkv->pa;
  758                         break;
  759                 case BD_PARAM_MAXSIZE:
  760                         t->maxsize = pkv->num;
  761                         break;
  762                 case BD_PARAM_NSEGMENTS:
  763                         t->nsegments = pkv->num;
  764                         break;
  765                 case BD_PARAM_MAXSEGSIZE:
  766                         t->maxsegsize = pkv->num;
  767                         break;
  768                 case BD_PARAM_FLAGS:
  769                         t->flags = pkv->num;
  770                         break;
  771                 case BD_PARAM_LOCKFUNC:
  772                         t->lockfunc = pkv->ptr;
  773                         break;
  774                 case BD_PARAM_LOCKFUNCARG:
  775                         t->lockfuncarg = pkv->ptr;
  776                         break;
  777                 case BD_PARAM_NAME:
  778                         t->name = pkv->ptr;
  779                         break;
  780                 case BD_PARAM_INVALID:
  781                 default:
  782                         KASSERT(0, ("Invalid key %d\n", pkv->key));
  783                         break;
  784                 }
  785         }
  786         return;
  787 }
  788 
  789 #ifndef IOMMU
  790 bool bus_dma_iommu_set_buswide(device_t dev);
  791 int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  792     vm_paddr_t start, vm_size_t length, int flags);
  793 
  794 bool
  795 bus_dma_iommu_set_buswide(device_t dev)
  796 {
  797         return (false);
  798 }
  799 
  800 int
  801 bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  802     vm_paddr_t start, vm_size_t length, int flags)
  803 {
  804         return (0);
  805 }
  806 #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
