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/10.0/sys/kern/subr_bus_dma.c 251221 2013-06-01 11:42:47Z marius $");
   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 a list of virtual addresses.
   58  */
   59 static int
   60 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
   61     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
   62     int flags)
   63 {
   64         int error;
   65 
   66         error = 0;
   67         for (; sglist_cnt > 0; sglist_cnt--, list++) {
   68                 error = _bus_dmamap_load_buffer(dmat, map,
   69                     (void *)(uintptr_t)list->ds_addr, list->ds_len, pmap,
   70                     flags, NULL, nsegs);
   71                 if (error)
   72                         break;
   73         }
   74         return (error);
   75 }
   76 
   77 /*
   78  * Load a list of physical addresses.
   79  */
   80 static int
   81 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
   82     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
   83 {
   84         int error;
   85 
   86         error = 0;
   87         for (; sglist_cnt > 0; sglist_cnt--, list++) {
   88                 error = _bus_dmamap_load_phys(dmat, map,
   89                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
   90                     nsegs);
   91                 if (error)
   92                         break;
   93         }
   94         return (error);
   95 }
   96 
   97 /*
   98  * Load an mbuf chain.
   99  */
  100 static int
  101 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  102     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  103 {
  104         struct mbuf *m;
  105         int error;
  106 
  107         error = 0;
  108         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  109                 if (m->m_len > 0) {
  110                         error = _bus_dmamap_load_buffer(dmat, map, m->m_data,
  111                             m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF,
  112                             segs, nsegs);
  113                 }
  114         }
  115         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  116             __func__, dmat, flags, error, *nsegs);
  117         return (error);
  118 }
  119 
  120 /*
  121  * Load from block io.
  122  */
  123 static int
  124 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  125     int *nsegs, int flags)
  126 {
  127         vm_paddr_t paddr;
  128         bus_size_t len, tlen;
  129         int error, i, ma_offs;
  130 
  131         if ((bio->bio_flags & BIO_UNMAPPED) == 0) {
  132                 error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  133                     bio->bio_bcount, kernel_pmap, flags, NULL, nsegs);
  134                 return (error);
  135         }
  136 
  137         error = 0;
  138         tlen = bio->bio_bcount;
  139         ma_offs = bio->bio_ma_offset;
  140         for (i = 0; tlen > 0; i++, tlen -= len) {
  141                 len = min(PAGE_SIZE - ma_offs, tlen);
  142                 paddr = VM_PAGE_TO_PHYS(bio->bio_ma[i]) + ma_offs;
  143                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  144                     flags, NULL, nsegs);
  145                 if (error != 0)
  146                         break;
  147                 ma_offs = 0;
  148         }
  149         return (error);
  150 }
  151 
  152 /*
  153  * Load a cam control block.
  154  */
  155 static int
  156 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  157                     int *nsegs, int flags)
  158 {
  159         struct ccb_hdr *ccb_h;
  160         void *data_ptr;
  161         int error;
  162         uint32_t dxfer_len;
  163         uint16_t sglist_cnt;
  164 
  165         error = 0;
  166         ccb_h = &ccb->ccb_h;
  167         switch (ccb_h->func_code) {
  168         case XPT_SCSI_IO: {
  169                 struct ccb_scsiio *csio;
  170 
  171                 csio = &ccb->csio;
  172                 data_ptr = csio->data_ptr;
  173                 dxfer_len = csio->dxfer_len;
  174                 sglist_cnt = csio->sglist_cnt;
  175                 break;
  176         }
  177         case XPT_CONT_TARGET_IO: {
  178                 struct ccb_scsiio *ctio;
  179 
  180                 ctio = &ccb->ctio;
  181                 data_ptr = ctio->data_ptr;
  182                 dxfer_len = ctio->dxfer_len;
  183                 sglist_cnt = ctio->sglist_cnt;
  184                 break;
  185         }
  186         case XPT_ATA_IO: {
  187                 struct ccb_ataio *ataio;
  188 
  189                 ataio = &ccb->ataio;
  190                 data_ptr = ataio->data_ptr;
  191                 dxfer_len = ataio->dxfer_len;
  192                 sglist_cnt = 0;
  193                 break;
  194         }
  195         default:
  196                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  197                     ccb_h->func_code);
  198         }
  199 
  200         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  201         case CAM_DATA_VADDR:
  202                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  203                     kernel_pmap, flags, NULL, nsegs);
  204                 break;
  205         case CAM_DATA_PADDR:
  206                 error = _bus_dmamap_load_phys(dmat, map,
  207                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  208                     nsegs);
  209                 break;
  210         case CAM_DATA_SG:
  211                 error = _bus_dmamap_load_vlist(dmat, map,
  212                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  213                     nsegs, flags);
  214                 break;
  215         case CAM_DATA_SG_PADDR:
  216                 error = _bus_dmamap_load_plist(dmat, map,
  217                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  218                 break;
  219         case CAM_DATA_BIO:
  220                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  221                     nsegs, flags);
  222                 break;
  223         default:
  224                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  225                     ccb_h->flags);
  226         }
  227         return (error);
  228 }
  229 
  230 /*
  231  * Load a uio.
  232  */
  233 static int
  234 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  235     int *nsegs, int flags)
  236 {
  237         bus_size_t resid;
  238         bus_size_t minlen;
  239         struct iovec *iov;
  240         pmap_t pmap;
  241         caddr_t addr;
  242         int error, i;
  243 
  244         if (uio->uio_segflg == UIO_USERSPACE) {
  245                 KASSERT(uio->uio_td != NULL,
  246                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  247                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  248         } else
  249                 pmap = kernel_pmap;
  250         resid = uio->uio_resid;
  251         iov = uio->uio_iov;
  252         error = 0;
  253 
  254         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  255                 /*
  256                  * Now at the first iovec to load.  Load each iovec
  257                  * until we have exhausted the residual count.
  258                  */
  259 
  260                 addr = (caddr_t) iov[i].iov_base;
  261                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  262                 if (minlen > 0) {
  263                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  264                             minlen, pmap, flags, NULL, nsegs);
  265                         resid -= minlen;
  266                 }
  267         }
  268 
  269         return (error);
  270 }
  271 
  272 /*
  273  * Map the buffer buf into bus space using the dmamap map.
  274  */
  275 int
  276 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  277     bus_size_t buflen, bus_dmamap_callback_t *callback,
  278     void *callback_arg, int flags)
  279 {
  280         bus_dma_segment_t *segs;
  281         struct memdesc mem;
  282         int error;
  283         int nsegs;
  284 
  285         if ((flags & BUS_DMA_NOWAIT) == 0) {
  286                 mem = memdesc_vaddr(buf, buflen);
  287                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  288         }
  289 
  290         nsegs = -1;
  291         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  292             flags, NULL, &nsegs);
  293         nsegs++;
  294 
  295         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  296             __func__, dmat, flags, error, nsegs);
  297 
  298         if (error == EINPROGRESS)
  299                 return (error);
  300 
  301         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  302         if (error)
  303                 (*callback)(callback_arg, segs, 0, error);
  304         else
  305                 (*callback)(callback_arg, segs, nsegs, 0);
  306 
  307         /*
  308          * Return ENOMEM to the caller so that it can pass it up the stack.
  309          * This error only happens when NOWAIT is set, so deferral is disabled.
  310          */
  311         if (error == ENOMEM)
  312                 return (error);
  313 
  314         return (0);
  315 }
  316 
  317 int
  318 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  319     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  320 {
  321         bus_dma_segment_t *segs;
  322         int nsegs, error;
  323 
  324         M_ASSERTPKTHDR(m0);
  325 
  326         flags |= BUS_DMA_NOWAIT;
  327         nsegs = -1;
  328         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  329         ++nsegs;
  330 
  331         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  332         if (error)
  333                 (*callback)(callback_arg, segs, 0, 0, error);
  334         else
  335                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  336 
  337         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  338             __func__, dmat, flags, error, nsegs);
  339         return (error);
  340 }
  341 
  342 int
  343 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  344     bus_dma_segment_t *segs, int *nsegs, int flags)
  345 {
  346         int error;
  347 
  348         flags |= BUS_DMA_NOWAIT;
  349         *nsegs = -1;
  350         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  351         ++*nsegs;
  352         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  353         return (error);
  354 }
  355 
  356 int
  357 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  358     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  359 {
  360         bus_dma_segment_t *segs;
  361         int nsegs, error;
  362 
  363         flags |= BUS_DMA_NOWAIT;
  364         nsegs = -1;
  365         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  366         nsegs++;
  367 
  368         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  369         if (error)
  370                 (*callback)(callback_arg, segs, 0, 0, error);
  371         else
  372                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  373 
  374         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  375             __func__, dmat, flags, error, nsegs);
  376         return (error);
  377 }
  378 
  379 int
  380 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  381                     bus_dmamap_callback_t *callback, void *callback_arg,
  382                     int flags)
  383 {
  384         bus_dma_segment_t *segs;
  385         struct ccb_hdr *ccb_h;
  386         struct memdesc mem;
  387         int error;
  388         int nsegs;
  389 
  390         ccb_h = &ccb->ccb_h;
  391         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  392                 callback(callback_arg, NULL, 0, 0);
  393                 return (0);
  394         }
  395         if ((flags & BUS_DMA_NOWAIT) == 0) {
  396                 mem = memdesc_ccb(ccb);
  397                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  398         }
  399         nsegs = -1;
  400         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  401         nsegs++;
  402 
  403         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  404             __func__, dmat, flags, error, nsegs);
  405 
  406         if (error == EINPROGRESS)
  407                 return (error);
  408 
  409         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  410         if (error)
  411                 (*callback)(callback_arg, segs, 0, error);
  412         else
  413                 (*callback)(callback_arg, segs, nsegs, error);
  414         /*
  415          * Return ENOMEM to the caller so that it can pass it up the stack.
  416          * This error only happens when NOWAIT is set, so deferral is disabled.
  417          */
  418         if (error == ENOMEM)
  419                 return (error);
  420 
  421         return (0);
  422 }
  423 
  424 int
  425 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  426                     bus_dmamap_callback_t *callback, void *callback_arg,
  427                     int flags)
  428 {
  429         bus_dma_segment_t *segs;
  430         struct memdesc mem;
  431         int error;
  432         int nsegs;
  433 
  434         if ((flags & BUS_DMA_NOWAIT) == 0) {
  435                 mem = memdesc_bio(bio);
  436                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  437         }
  438         nsegs = -1;
  439         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  440         nsegs++;
  441 
  442         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  443             __func__, dmat, flags, error, nsegs);
  444 
  445         if (error == EINPROGRESS)
  446                 return (error);
  447 
  448         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  449         if (error)
  450                 (*callback)(callback_arg, segs, 0, error);
  451         else
  452                 (*callback)(callback_arg, segs, nsegs, error);
  453         /*
  454          * Return ENOMEM to the caller so that it can pass it up the stack.
  455          * This error only happens when NOWAIT is set, so deferral is disabled.
  456          */
  457         if (error == ENOMEM)
  458                 return (error);
  459 
  460         return (0);
  461 }
  462 
  463 int
  464 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  465     struct memdesc *mem, bus_dmamap_callback_t *callback,
  466     void *callback_arg, int flags)
  467 {
  468         bus_dma_segment_t *segs;
  469         int error;
  470         int nsegs;
  471 
  472         if ((flags & BUS_DMA_NOWAIT) == 0)
  473                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  474 
  475         nsegs = -1;
  476         error = 0;
  477         switch (mem->md_type) {
  478         case MEMDESC_VADDR:
  479                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  480                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  481                 break;
  482         case MEMDESC_PADDR:
  483                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  484                     mem->md_opaque, flags, NULL, &nsegs);
  485                 break;
  486         case MEMDESC_VLIST:
  487                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  488                     mem->md_opaque, kernel_pmap, &nsegs, flags);
  489                 break;
  490         case MEMDESC_PLIST:
  491                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  492                     mem->md_opaque, &nsegs, flags);
  493                 break;
  494         case MEMDESC_BIO:
  495                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  496                     &nsegs, flags);
  497                 break;
  498         case MEMDESC_UIO:
  499                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  500                     &nsegs, flags);
  501                 break;
  502         case MEMDESC_MBUF:
  503                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  504                     NULL, &nsegs, flags);
  505                 break;
  506         case MEMDESC_CCB:
  507                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  508                     flags);
  509                 break;
  510         }
  511         nsegs++;
  512 
  513         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  514             __func__, dmat, flags, error, nsegs);
  515 
  516         if (error == EINPROGRESS)
  517                 return (error);
  518 
  519         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  520         if (error)
  521                 (*callback)(callback_arg, segs, 0, error);
  522         else
  523                 (*callback)(callback_arg, segs, nsegs, 0);
  524 
  525         /*
  526          * Return ENOMEM to the caller so that it can pass it up the stack.
  527          * This error only happens when NOWAIT is set, so deferral is disabled.
  528          */
  529         if (error == ENOMEM)
  530                 return (error);
  531 
  532         return (0);
  533 }

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