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/10.1/sys/kern/subr_bus_dma.c 259510 2013-12-17 13:38:21Z kib $");
   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         int error;
  128 
  129         if ((bio->bio_flags & BIO_UNMAPPED) == 0) {
  130                 error = _bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  131                     bio->bio_bcount, kernel_pmap, flags, NULL, nsegs);
  132         } else {
  133                 error = _bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  134                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs);
  135         }
  136         return (error);
  137 }
  138 
  139 int
  140 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  141     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  142     bus_dma_segment_t *segs, int *segp)
  143 {
  144         vm_paddr_t paddr;
  145         bus_size_t len;
  146         int error, i;
  147 
  148         error = 0;
  149         for (i = 0; tlen > 0; i++, tlen -= len) {
  150                 len = min(PAGE_SIZE - ma_offs, tlen);
  151                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  152                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  153                     flags, segs, segp);
  154                 if (error != 0)
  155                         break;
  156                 ma_offs = 0;
  157         }
  158         return (error);
  159 }
  160 
  161 /*
  162  * Load a cam control block.
  163  */
  164 static int
  165 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  166                     int *nsegs, int flags)
  167 {
  168         struct ccb_hdr *ccb_h;
  169         void *data_ptr;
  170         int error;
  171         uint32_t dxfer_len;
  172         uint16_t sglist_cnt;
  173 
  174         error = 0;
  175         ccb_h = &ccb->ccb_h;
  176         switch (ccb_h->func_code) {
  177         case XPT_SCSI_IO: {
  178                 struct ccb_scsiio *csio;
  179 
  180                 csio = &ccb->csio;
  181                 data_ptr = csio->data_ptr;
  182                 dxfer_len = csio->dxfer_len;
  183                 sglist_cnt = csio->sglist_cnt;
  184                 break;
  185         }
  186         case XPT_CONT_TARGET_IO: {
  187                 struct ccb_scsiio *ctio;
  188 
  189                 ctio = &ccb->ctio;
  190                 data_ptr = ctio->data_ptr;
  191                 dxfer_len = ctio->dxfer_len;
  192                 sglist_cnt = ctio->sglist_cnt;
  193                 break;
  194         }
  195         case XPT_ATA_IO: {
  196                 struct ccb_ataio *ataio;
  197 
  198                 ataio = &ccb->ataio;
  199                 data_ptr = ataio->data_ptr;
  200                 dxfer_len = ataio->dxfer_len;
  201                 sglist_cnt = 0;
  202                 break;
  203         }
  204         default:
  205                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  206                     ccb_h->func_code);
  207         }
  208 
  209         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  210         case CAM_DATA_VADDR:
  211                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  212                     kernel_pmap, flags, NULL, nsegs);
  213                 break;
  214         case CAM_DATA_PADDR:
  215                 error = _bus_dmamap_load_phys(dmat, map,
  216                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  217                     nsegs);
  218                 break;
  219         case CAM_DATA_SG:
  220                 error = _bus_dmamap_load_vlist(dmat, map,
  221                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  222                     nsegs, flags);
  223                 break;
  224         case CAM_DATA_SG_PADDR:
  225                 error = _bus_dmamap_load_plist(dmat, map,
  226                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  227                 break;
  228         case CAM_DATA_BIO:
  229                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  230                     nsegs, flags);
  231                 break;
  232         default:
  233                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  234                     ccb_h->flags);
  235         }
  236         return (error);
  237 }
  238 
  239 /*
  240  * Load a uio.
  241  */
  242 static int
  243 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  244     int *nsegs, int flags)
  245 {
  246         bus_size_t resid;
  247         bus_size_t minlen;
  248         struct iovec *iov;
  249         pmap_t pmap;
  250         caddr_t addr;
  251         int error, i;
  252 
  253         if (uio->uio_segflg == UIO_USERSPACE) {
  254                 KASSERT(uio->uio_td != NULL,
  255                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  256                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  257         } else
  258                 pmap = kernel_pmap;
  259         resid = uio->uio_resid;
  260         iov = uio->uio_iov;
  261         error = 0;
  262 
  263         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  264                 /*
  265                  * Now at the first iovec to load.  Load each iovec
  266                  * until we have exhausted the residual count.
  267                  */
  268 
  269                 addr = (caddr_t) iov[i].iov_base;
  270                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  271                 if (minlen > 0) {
  272                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  273                             minlen, pmap, flags, NULL, nsegs);
  274                         resid -= minlen;
  275                 }
  276         }
  277 
  278         return (error);
  279 }
  280 
  281 /*
  282  * Map the buffer buf into bus space using the dmamap map.
  283  */
  284 int
  285 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  286     bus_size_t buflen, bus_dmamap_callback_t *callback,
  287     void *callback_arg, int flags)
  288 {
  289         bus_dma_segment_t *segs;
  290         struct memdesc mem;
  291         int error;
  292         int nsegs;
  293 
  294         if ((flags & BUS_DMA_NOWAIT) == 0) {
  295                 mem = memdesc_vaddr(buf, buflen);
  296                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  297         }
  298 
  299         nsegs = -1;
  300         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  301             flags, NULL, &nsegs);
  302         nsegs++;
  303 
  304         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  305             __func__, dmat, flags, error, nsegs);
  306 
  307         if (error == EINPROGRESS)
  308                 return (error);
  309 
  310         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  311         if (error)
  312                 (*callback)(callback_arg, segs, 0, error);
  313         else
  314                 (*callback)(callback_arg, segs, nsegs, 0);
  315 
  316         /*
  317          * Return ENOMEM to the caller so that it can pass it up the stack.
  318          * This error only happens when NOWAIT is set, so deferral is disabled.
  319          */
  320         if (error == ENOMEM)
  321                 return (error);
  322 
  323         return (0);
  324 }
  325 
  326 int
  327 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  328     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  329 {
  330         bus_dma_segment_t *segs;
  331         int nsegs, error;
  332 
  333         M_ASSERTPKTHDR(m0);
  334 
  335         flags |= BUS_DMA_NOWAIT;
  336         nsegs = -1;
  337         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  338         ++nsegs;
  339 
  340         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  341         if (error)
  342                 (*callback)(callback_arg, segs, 0, 0, error);
  343         else
  344                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  345 
  346         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  347             __func__, dmat, flags, error, nsegs);
  348         return (error);
  349 }
  350 
  351 int
  352 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  353     bus_dma_segment_t *segs, int *nsegs, int flags)
  354 {
  355         int error;
  356 
  357         flags |= BUS_DMA_NOWAIT;
  358         *nsegs = -1;
  359         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  360         ++*nsegs;
  361         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  362         return (error);
  363 }
  364 
  365 int
  366 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  367     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  368 {
  369         bus_dma_segment_t *segs;
  370         int nsegs, error;
  371 
  372         flags |= BUS_DMA_NOWAIT;
  373         nsegs = -1;
  374         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  375         nsegs++;
  376 
  377         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  378         if (error)
  379                 (*callback)(callback_arg, segs, 0, 0, error);
  380         else
  381                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  382 
  383         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  384             __func__, dmat, flags, error, nsegs);
  385         return (error);
  386 }
  387 
  388 int
  389 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  390                     bus_dmamap_callback_t *callback, void *callback_arg,
  391                     int flags)
  392 {
  393         bus_dma_segment_t *segs;
  394         struct ccb_hdr *ccb_h;
  395         struct memdesc mem;
  396         int error;
  397         int nsegs;
  398 
  399         ccb_h = &ccb->ccb_h;
  400         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  401                 callback(callback_arg, NULL, 0, 0);
  402                 return (0);
  403         }
  404         if ((flags & BUS_DMA_NOWAIT) == 0) {
  405                 mem = memdesc_ccb(ccb);
  406                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  407         }
  408         nsegs = -1;
  409         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  410         nsegs++;
  411 
  412         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  413             __func__, dmat, flags, error, nsegs);
  414 
  415         if (error == EINPROGRESS)
  416                 return (error);
  417 
  418         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  419         if (error)
  420                 (*callback)(callback_arg, segs, 0, error);
  421         else
  422                 (*callback)(callback_arg, segs, nsegs, error);
  423         /*
  424          * Return ENOMEM to the caller so that it can pass it up the stack.
  425          * This error only happens when NOWAIT is set, so deferral is disabled.
  426          */
  427         if (error == ENOMEM)
  428                 return (error);
  429 
  430         return (0);
  431 }
  432 
  433 int
  434 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  435                     bus_dmamap_callback_t *callback, void *callback_arg,
  436                     int flags)
  437 {
  438         bus_dma_segment_t *segs;
  439         struct memdesc mem;
  440         int error;
  441         int nsegs;
  442 
  443         if ((flags & BUS_DMA_NOWAIT) == 0) {
  444                 mem = memdesc_bio(bio);
  445                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  446         }
  447         nsegs = -1;
  448         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  449         nsegs++;
  450 
  451         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  452             __func__, dmat, flags, error, nsegs);
  453 
  454         if (error == EINPROGRESS)
  455                 return (error);
  456 
  457         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  458         if (error)
  459                 (*callback)(callback_arg, segs, 0, error);
  460         else
  461                 (*callback)(callback_arg, segs, nsegs, error);
  462         /*
  463          * Return ENOMEM to the caller so that it can pass it up the stack.
  464          * This error only happens when NOWAIT is set, so deferral is disabled.
  465          */
  466         if (error == ENOMEM)
  467                 return (error);
  468 
  469         return (0);
  470 }
  471 
  472 int
  473 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  474     struct memdesc *mem, bus_dmamap_callback_t *callback,
  475     void *callback_arg, int flags)
  476 {
  477         bus_dma_segment_t *segs;
  478         int error;
  479         int nsegs;
  480 
  481         if ((flags & BUS_DMA_NOWAIT) == 0)
  482                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  483 
  484         nsegs = -1;
  485         error = 0;
  486         switch (mem->md_type) {
  487         case MEMDESC_VADDR:
  488                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  489                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  490                 break;
  491         case MEMDESC_PADDR:
  492                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  493                     mem->md_opaque, flags, NULL, &nsegs);
  494                 break;
  495         case MEMDESC_VLIST:
  496                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  497                     mem->md_opaque, kernel_pmap, &nsegs, flags);
  498                 break;
  499         case MEMDESC_PLIST:
  500                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  501                     mem->md_opaque, &nsegs, flags);
  502                 break;
  503         case MEMDESC_BIO:
  504                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  505                     &nsegs, flags);
  506                 break;
  507         case MEMDESC_UIO:
  508                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  509                     &nsegs, flags);
  510                 break;
  511         case MEMDESC_MBUF:
  512                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  513                     NULL, &nsegs, flags);
  514                 break;
  515         case MEMDESC_CCB:
  516                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  517                     flags);
  518                 break;
  519         }
  520         nsegs++;
  521 
  522         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  523             __func__, dmat, flags, error, nsegs);
  524 
  525         if (error == EINPROGRESS)
  526                 return (error);
  527 
  528         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  529         if (error)
  530                 (*callback)(callback_arg, segs, 0, error);
  531         else
  532                 (*callback)(callback_arg, segs, nsegs, 0);
  533 
  534         /*
  535          * Return ENOMEM to the caller so that it can pass it up the stack.
  536          * This error only happens when NOWAIT is set, so deferral is disabled.
  537          */
  538         if (error == ENOMEM)
  539                 return (error);
  540 
  541         return (0);
  542 }

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