The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_bus_dma.c

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    1 /*-
    2  * Copyright (c) 2012 EMC Corp.
    3  * All rights reserved.
    4  *
    5  * Copyright (c) 1997, 1998 Justin T. Gibbs.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/11.2/sys/kern/subr_bus_dma.c 328696 2018-02-01 18:57:10Z mav $");
   32 
   33 #include "opt_bus.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/conf.h>
   37 #include <sys/systm.h>
   38 #include <sys/bio.h>
   39 #include <sys/bus.h>
   40 #include <sys/callout.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/memdesc.h>
   43 #include <sys/proc.h>
   44 #include <sys/uio.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_page.h>
   48 #include <vm/vm_map.h>
   49 #include <vm/pmap.h>
   50 
   51 #include <cam/cam.h>
   52 #include <cam/cam_ccb.h>
   53 
   54 #include <machine/bus.h>
   55 
   56 /*
   57  * Load up data starting at offset within a region specified by a
   58  * list of virtual address ranges until either length or the region
   59  * are exhausted.
   60  */
   61 static int
   62 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
   63     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
   64     int flags, size_t offset, size_t length)
   65 {
   66         int error;
   67 
   68         error = 0;
   69         for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
   70                 char *addr;
   71                 size_t ds_len;
   72 
   73                 KASSERT((offset < list->ds_len),
   74                     ("Invalid mid-segment offset"));
   75                 addr = (char *)(uintptr_t)list->ds_addr + offset;
   76                 ds_len = list->ds_len - offset;
   77                 offset = 0;
   78                 if (ds_len > length)
   79                         ds_len = length;
   80                 length -= ds_len;
   81                 KASSERT((ds_len != 0), ("Segment length is zero"));
   82                 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
   83                     flags, NULL, nsegs);
   84                 if (error)
   85                         break;
   86         }
   87         return (error);
   88 }
   89 
   90 /*
   91  * Load a list of physical addresses.
   92  */
   93 static int
   94 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
   95     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
   96 {
   97         int error;
   98 
   99         error = 0;
  100         for (; sglist_cnt > 0; sglist_cnt--, list++) {
  101                 error = _bus_dmamap_load_phys(dmat, map,
  102                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
  103                     nsegs);
  104                 if (error)
  105                         break;
  106         }
  107         return (error);
  108 }
  109 
  110 /*
  111  * Load an mbuf chain.
  112  */
  113 static int
  114 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  115     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  116 {
  117         struct mbuf *m;
  118         int error;
  119 
  120         error = 0;
  121         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  122                 if (m->m_len > 0) {
  123                         error = _bus_dmamap_load_buffer(dmat, map, m->m_data,
  124                             m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF,
  125                             segs, nsegs);
  126                 }
  127         }
  128         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  129             __func__, dmat, flags, error, *nsegs);
  130         return (error);
  131 }
  132 
  133 /*
  134  * Load from block io.
  135  */
  136 static int
  137 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  138     int *nsegs, int flags)
  139 {
  140 
  141         if ((bio->bio_flags & BIO_VLIST) != 0) {
  142                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
  143                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
  144                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
  145                     bio->bio_bcount));
  146         }
  147 
  148         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
  149                 return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  150                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
  151 
  152         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  153             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
  154 }
  155 
  156 int
  157 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  158     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  159     bus_dma_segment_t *segs, int *segp)
  160 {
  161         vm_paddr_t paddr;
  162         bus_size_t len;
  163         int error, i;
  164 
  165         error = 0;
  166         for (i = 0; tlen > 0; i++, tlen -= len) {
  167                 len = min(PAGE_SIZE - ma_offs, tlen);
  168                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  169                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  170                     flags, segs, segp);
  171                 if (error != 0)
  172                         break;
  173                 ma_offs = 0;
  174         }
  175         return (error);
  176 }
  177 
  178 /*
  179  * Load a cam control block.
  180  */
  181 static int
  182 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  183                     int *nsegs, int flags)
  184 {
  185         struct ccb_hdr *ccb_h;
  186         void *data_ptr;
  187         int error;
  188         uint32_t dxfer_len;
  189         uint16_t sglist_cnt;
  190 
  191         error = 0;
  192         ccb_h = &ccb->ccb_h;
  193         switch (ccb_h->func_code) {
  194         case XPT_SCSI_IO: {
  195                 struct ccb_scsiio *csio;
  196 
  197                 csio = &ccb->csio;
  198                 data_ptr = csio->data_ptr;
  199                 dxfer_len = csio->dxfer_len;
  200                 sglist_cnt = csio->sglist_cnt;
  201                 break;
  202         }
  203         case XPT_CONT_TARGET_IO: {
  204                 struct ccb_scsiio *ctio;
  205 
  206                 ctio = &ccb->ctio;
  207                 data_ptr = ctio->data_ptr;
  208                 dxfer_len = ctio->dxfer_len;
  209                 sglist_cnt = ctio->sglist_cnt;
  210                 break;
  211         }
  212         case XPT_ATA_IO: {
  213                 struct ccb_ataio *ataio;
  214 
  215                 ataio = &ccb->ataio;
  216                 data_ptr = ataio->data_ptr;
  217                 dxfer_len = ataio->dxfer_len;
  218                 sglist_cnt = 0;
  219                 break;
  220         }
  221         case XPT_NVME_IO:
  222         case XPT_NVME_ADMIN: {
  223                 struct ccb_nvmeio *nvmeio;
  224 
  225                 nvmeio = &ccb->nvmeio;
  226                 data_ptr = nvmeio->data_ptr;
  227                 dxfer_len = nvmeio->dxfer_len;
  228                 sglist_cnt = nvmeio->sglist_cnt;
  229                 break;
  230         }
  231         default:
  232                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  233                     ccb_h->func_code);
  234         }
  235 
  236         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  237         case CAM_DATA_VADDR:
  238                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  239                     kernel_pmap, flags, NULL, nsegs);
  240                 break;
  241         case CAM_DATA_PADDR:
  242                 error = _bus_dmamap_load_phys(dmat, map,
  243                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  244                     nsegs);
  245                 break;
  246         case CAM_DATA_SG:
  247                 error = _bus_dmamap_load_vlist(dmat, map,
  248                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  249                     nsegs, flags, 0, dxfer_len);
  250                 break;
  251         case CAM_DATA_SG_PADDR:
  252                 error = _bus_dmamap_load_plist(dmat, map,
  253                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  254                 break;
  255         case CAM_DATA_BIO:
  256                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  257                     nsegs, flags);
  258                 break;
  259         default:
  260                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  261                     ccb_h->flags);
  262         }
  263         return (error);
  264 }
  265 
  266 /*
  267  * Load a uio.
  268  */
  269 static int
  270 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  271     int *nsegs, int flags)
  272 {
  273         bus_size_t resid;
  274         bus_size_t minlen;
  275         struct iovec *iov;
  276         pmap_t pmap;
  277         caddr_t addr;
  278         int error, i;
  279 
  280         if (uio->uio_segflg == UIO_USERSPACE) {
  281                 KASSERT(uio->uio_td != NULL,
  282                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  283                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  284         } else
  285                 pmap = kernel_pmap;
  286         resid = uio->uio_resid;
  287         iov = uio->uio_iov;
  288         error = 0;
  289 
  290         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  291                 /*
  292                  * Now at the first iovec to load.  Load each iovec
  293                  * until we have exhausted the residual count.
  294                  */
  295 
  296                 addr = (caddr_t) iov[i].iov_base;
  297                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  298                 if (minlen > 0) {
  299                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  300                             minlen, pmap, flags, NULL, nsegs);
  301                         resid -= minlen;
  302                 }
  303         }
  304 
  305         return (error);
  306 }
  307 
  308 /*
  309  * Map the buffer buf into bus space using the dmamap map.
  310  */
  311 int
  312 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  313     bus_size_t buflen, bus_dmamap_callback_t *callback,
  314     void *callback_arg, int flags)
  315 {
  316         bus_dma_segment_t *segs;
  317         struct memdesc mem;
  318         int error;
  319         int nsegs;
  320 
  321         if ((flags & BUS_DMA_NOWAIT) == 0) {
  322                 mem = memdesc_vaddr(buf, buflen);
  323                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  324         }
  325 
  326         nsegs = -1;
  327         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  328             flags, NULL, &nsegs);
  329         nsegs++;
  330 
  331         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  332             __func__, dmat, flags, error, nsegs);
  333 
  334         if (error == EINPROGRESS)
  335                 return (error);
  336 
  337         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  338         if (error)
  339                 (*callback)(callback_arg, segs, 0, error);
  340         else
  341                 (*callback)(callback_arg, segs, nsegs, 0);
  342 
  343         /*
  344          * Return ENOMEM to the caller so that it can pass it up the stack.
  345          * This error only happens when NOWAIT is set, so deferral is disabled.
  346          */
  347         if (error == ENOMEM)
  348                 return (error);
  349 
  350         return (0);
  351 }
  352 
  353 int
  354 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  355     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  356 {
  357         bus_dma_segment_t *segs;
  358         int nsegs, error;
  359 
  360         M_ASSERTPKTHDR(m0);
  361 
  362         flags |= BUS_DMA_NOWAIT;
  363         nsegs = -1;
  364         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  365         ++nsegs;
  366 
  367         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  368         if (error)
  369                 (*callback)(callback_arg, segs, 0, 0, error);
  370         else
  371                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  372 
  373         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  374             __func__, dmat, flags, error, nsegs);
  375         return (error);
  376 }
  377 
  378 int
  379 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  380     bus_dma_segment_t *segs, int *nsegs, int flags)
  381 {
  382         int error;
  383 
  384         flags |= BUS_DMA_NOWAIT;
  385         *nsegs = -1;
  386         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  387         ++*nsegs;
  388         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  389         return (error);
  390 }
  391 
  392 int
  393 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  394     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  395 {
  396         bus_dma_segment_t *segs;
  397         int nsegs, error;
  398 
  399         flags |= BUS_DMA_NOWAIT;
  400         nsegs = -1;
  401         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  402         nsegs++;
  403 
  404         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  405         if (error)
  406                 (*callback)(callback_arg, segs, 0, 0, error);
  407         else
  408                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  409 
  410         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  411             __func__, dmat, flags, error, nsegs);
  412         return (error);
  413 }
  414 
  415 int
  416 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  417                     bus_dmamap_callback_t *callback, void *callback_arg,
  418                     int flags)
  419 {
  420         bus_dma_segment_t *segs;
  421         struct ccb_hdr *ccb_h;
  422         struct memdesc mem;
  423         int error;
  424         int nsegs;
  425 
  426         ccb_h = &ccb->ccb_h;
  427         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  428                 callback(callback_arg, NULL, 0, 0);
  429                 return (0);
  430         }
  431         if ((flags & BUS_DMA_NOWAIT) == 0) {
  432                 mem = memdesc_ccb(ccb);
  433                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  434         }
  435         nsegs = -1;
  436         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  437         nsegs++;
  438 
  439         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  440             __func__, dmat, flags, error, nsegs);
  441 
  442         if (error == EINPROGRESS)
  443                 return (error);
  444 
  445         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  446         if (error)
  447                 (*callback)(callback_arg, segs, 0, error);
  448         else
  449                 (*callback)(callback_arg, segs, nsegs, error);
  450         /*
  451          * Return ENOMEM to the caller so that it can pass it up the stack.
  452          * This error only happens when NOWAIT is set, so deferral is disabled.
  453          */
  454         if (error == ENOMEM)
  455                 return (error);
  456 
  457         return (0);
  458 }
  459 
  460 int
  461 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  462                     bus_dmamap_callback_t *callback, void *callback_arg,
  463                     int flags)
  464 {
  465         bus_dma_segment_t *segs;
  466         struct memdesc mem;
  467         int error;
  468         int nsegs;
  469 
  470         if ((flags & BUS_DMA_NOWAIT) == 0) {
  471                 mem = memdesc_bio(bio);
  472                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  473         }
  474         nsegs = -1;
  475         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  476         nsegs++;
  477 
  478         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  479             __func__, dmat, flags, error, nsegs);
  480 
  481         if (error == EINPROGRESS)
  482                 return (error);
  483 
  484         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  485         if (error)
  486                 (*callback)(callback_arg, segs, 0, error);
  487         else
  488                 (*callback)(callback_arg, segs, nsegs, error);
  489         /*
  490          * Return ENOMEM to the caller so that it can pass it up the stack.
  491          * This error only happens when NOWAIT is set, so deferral is disabled.
  492          */
  493         if (error == ENOMEM)
  494                 return (error);
  495 
  496         return (0);
  497 }
  498 
  499 int
  500 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  501     struct memdesc *mem, bus_dmamap_callback_t *callback,
  502     void *callback_arg, int flags)
  503 {
  504         bus_dma_segment_t *segs;
  505         int error;
  506         int nsegs;
  507 
  508         if ((flags & BUS_DMA_NOWAIT) == 0)
  509                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  510 
  511         nsegs = -1;
  512         error = 0;
  513         switch (mem->md_type) {
  514         case MEMDESC_VADDR:
  515                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  516                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  517                 break;
  518         case MEMDESC_PADDR:
  519                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  520                     mem->md_opaque, flags, NULL, &nsegs);
  521                 break;
  522         case MEMDESC_VLIST:
  523                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  524                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
  525                 break;
  526         case MEMDESC_PLIST:
  527                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  528                     mem->md_opaque, &nsegs, flags);
  529                 break;
  530         case MEMDESC_BIO:
  531                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  532                     &nsegs, flags);
  533                 break;
  534         case MEMDESC_UIO:
  535                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  536                     &nsegs, flags);
  537                 break;
  538         case MEMDESC_MBUF:
  539                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  540                     NULL, &nsegs, flags);
  541                 break;
  542         case MEMDESC_CCB:
  543                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  544                     flags);
  545                 break;
  546         }
  547         nsegs++;
  548 
  549         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  550             __func__, dmat, flags, error, nsegs);
  551 
  552         if (error == EINPROGRESS)
  553                 return (error);
  554 
  555         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  556         if (error)
  557                 (*callback)(callback_arg, segs, 0, error);
  558         else
  559                 (*callback)(callback_arg, segs, nsegs, 0);
  560 
  561         /*
  562          * Return ENOMEM to the caller so that it can pass it up the stack.
  563          * This error only happens when NOWAIT is set, so deferral is disabled.
  564          */
  565         if (error == ENOMEM)
  566                 return (error);
  567 
  568         return (0);
  569 }

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