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 
   37 #include <sys/param.h>
   38 #include <sys/conf.h>
   39 #include <sys/systm.h>
   40 #include <sys/bio.h>
   41 #include <sys/bus.h>
   42 #include <sys/callout.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/memdesc.h>
   45 #include <sys/proc.h>
   46 #include <sys/uio.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_page.h>
   50 #include <vm/vm_map.h>
   51 #include <vm/pmap.h>
   52 
   53 #include <cam/cam.h>
   54 #include <cam/cam_ccb.h>
   55 
   56 #include <machine/bus.h>
   57 
   58 /*
   59  * Load up data starting at offset within a region specified by a
   60  * list of virtual address ranges until either length or the region
   61  * are exhausted.
   62  */
   63 static int
   64 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
   65     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
   66     int flags, size_t offset, size_t length)
   67 {
   68         int error;
   69 
   70         error = 0;
   71         for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
   72                 char *addr;
   73                 size_t ds_len;
   74 
   75                 KASSERT((offset < list->ds_len),
   76                     ("Invalid mid-segment offset"));
   77                 addr = (char *)(uintptr_t)list->ds_addr + offset;
   78                 ds_len = list->ds_len - offset;
   79                 offset = 0;
   80                 if (ds_len > length)
   81                         ds_len = length;
   82                 length -= ds_len;
   83                 KASSERT((ds_len != 0), ("Segment length is zero"));
   84                 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
   85                     flags, NULL, nsegs);
   86                 if (error)
   87                         break;
   88         }
   89         return (error);
   90 }
   91 
   92 /*
   93  * Load a list of physical addresses.
   94  */
   95 static int
   96 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
   97     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
   98 {
   99         int error;
  100 
  101         error = 0;
  102         for (; sglist_cnt > 0; sglist_cnt--, list++) {
  103                 error = _bus_dmamap_load_phys(dmat, map,
  104                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
  105                     nsegs);
  106                 if (error)
  107                         break;
  108         }
  109         return (error);
  110 }
  111 
  112 /*
  113  * Load an mbuf chain.
  114  */
  115 static int
  116 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  117     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  118 {
  119         struct mbuf *m;
  120         int error;
  121 
  122         error = 0;
  123         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  124                 if (m->m_len > 0) {
  125                         error = _bus_dmamap_load_buffer(dmat, map, m->m_data,
  126                             m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF,
  127                             segs, nsegs);
  128                 }
  129         }
  130         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  131             __func__, dmat, flags, error, *nsegs);
  132         return (error);
  133 }
  134 
  135 /*
  136  * Load from block io.
  137  */
  138 static int
  139 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  140     int *nsegs, int flags)
  141 {
  142 
  143         if ((bio->bio_flags & BIO_VLIST) != 0) {
  144                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
  145                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
  146                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
  147                     bio->bio_bcount));
  148         }
  149 
  150         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
  151                 return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  152                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
  153 
  154         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  155             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
  156 }
  157 
  158 int
  159 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  160     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  161     bus_dma_segment_t *segs, int *segp)
  162 {
  163         vm_paddr_t paddr;
  164         bus_size_t len;
  165         int error, i;
  166 
  167         error = 0;
  168         for (i = 0; tlen > 0; i++, tlen -= len) {
  169                 len = min(PAGE_SIZE - ma_offs, tlen);
  170                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  171                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  172                     flags, segs, segp);
  173                 if (error != 0)
  174                         break;
  175                 ma_offs = 0;
  176         }
  177         return (error);
  178 }
  179 
  180 /*
  181  * Load a cam control block.
  182  */
  183 static int
  184 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  185                     int *nsegs, int flags)
  186 {
  187         struct ccb_hdr *ccb_h;
  188         void *data_ptr;
  189         int error;
  190         uint32_t dxfer_len;
  191         uint16_t sglist_cnt;
  192 
  193         error = 0;
  194         ccb_h = &ccb->ccb_h;
  195         switch (ccb_h->func_code) {
  196         case XPT_SCSI_IO: {
  197                 struct ccb_scsiio *csio;
  198 
  199                 csio = &ccb->csio;
  200                 data_ptr = csio->data_ptr;
  201                 dxfer_len = csio->dxfer_len;
  202                 sglist_cnt = csio->sglist_cnt;
  203                 break;
  204         }
  205         case XPT_CONT_TARGET_IO: {
  206                 struct ccb_scsiio *ctio;
  207 
  208                 ctio = &ccb->ctio;
  209                 data_ptr = ctio->data_ptr;
  210                 dxfer_len = ctio->dxfer_len;
  211                 sglist_cnt = ctio->sglist_cnt;
  212                 break;
  213         }
  214         case XPT_ATA_IO: {
  215                 struct ccb_ataio *ataio;
  216 
  217                 ataio = &ccb->ataio;
  218                 data_ptr = ataio->data_ptr;
  219                 dxfer_len = ataio->dxfer_len;
  220                 sglist_cnt = 0;
  221                 break;
  222         }
  223         case XPT_NVME_IO:
  224         case XPT_NVME_ADMIN: {
  225                 struct ccb_nvmeio *nvmeio;
  226 
  227                 nvmeio = &ccb->nvmeio;
  228                 data_ptr = nvmeio->data_ptr;
  229                 dxfer_len = nvmeio->dxfer_len;
  230                 sglist_cnt = nvmeio->sglist_cnt;
  231                 break;
  232         }
  233         default:
  234                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  235                     ccb_h->func_code);
  236         }
  237 
  238         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  239         case CAM_DATA_VADDR:
  240                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  241                     kernel_pmap, flags, NULL, nsegs);
  242                 break;
  243         case CAM_DATA_PADDR:
  244                 error = _bus_dmamap_load_phys(dmat, map,
  245                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  246                     nsegs);
  247                 break;
  248         case CAM_DATA_SG:
  249                 error = _bus_dmamap_load_vlist(dmat, map,
  250                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  251                     nsegs, flags, 0, dxfer_len);
  252                 break;
  253         case CAM_DATA_SG_PADDR:
  254                 error = _bus_dmamap_load_plist(dmat, map,
  255                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  256                 break;
  257         case CAM_DATA_BIO:
  258                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  259                     nsegs, flags);
  260                 break;
  261         default:
  262                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  263                     ccb_h->flags);
  264         }
  265         return (error);
  266 }
  267 
  268 /*
  269  * Load a uio.
  270  */
  271 static int
  272 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  273     int *nsegs, int flags)
  274 {
  275         bus_size_t resid;
  276         bus_size_t minlen;
  277         struct iovec *iov;
  278         pmap_t pmap;
  279         caddr_t addr;
  280         int error, i;
  281 
  282         if (uio->uio_segflg == UIO_USERSPACE) {
  283                 KASSERT(uio->uio_td != NULL,
  284                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  285                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  286         } else
  287                 pmap = kernel_pmap;
  288         resid = uio->uio_resid;
  289         iov = uio->uio_iov;
  290         error = 0;
  291 
  292         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  293                 /*
  294                  * Now at the first iovec to load.  Load each iovec
  295                  * until we have exhausted the residual count.
  296                  */
  297 
  298                 addr = (caddr_t) iov[i].iov_base;
  299                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  300                 if (minlen > 0) {
  301                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  302                             minlen, pmap, flags, NULL, nsegs);
  303                         resid -= minlen;
  304                 }
  305         }
  306 
  307         return (error);
  308 }
  309 
  310 /*
  311  * Map the buffer buf into bus space using the dmamap map.
  312  */
  313 int
  314 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  315     bus_size_t buflen, bus_dmamap_callback_t *callback,
  316     void *callback_arg, int flags)
  317 {
  318         bus_dma_segment_t *segs;
  319         struct memdesc mem;
  320         int error;
  321         int nsegs;
  322 
  323         if ((flags & BUS_DMA_NOWAIT) == 0) {
  324                 mem = memdesc_vaddr(buf, buflen);
  325                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  326         }
  327 
  328         nsegs = -1;
  329         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  330             flags, NULL, &nsegs);
  331         nsegs++;
  332 
  333         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  334             __func__, dmat, flags, error, nsegs);
  335 
  336         if (error == EINPROGRESS)
  337                 return (error);
  338 
  339         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  340         if (error)
  341                 (*callback)(callback_arg, segs, 0, error);
  342         else
  343                 (*callback)(callback_arg, segs, nsegs, 0);
  344 
  345         /*
  346          * Return ENOMEM to the caller so that it can pass it up the stack.
  347          * This error only happens when NOWAIT is set, so deferral is disabled.
  348          */
  349         if (error == ENOMEM)
  350                 return (error);
  351 
  352         return (0);
  353 }
  354 
  355 int
  356 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  357     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  358 {
  359         bus_dma_segment_t *segs;
  360         int nsegs, error;
  361 
  362         M_ASSERTPKTHDR(m0);
  363 
  364         flags |= BUS_DMA_NOWAIT;
  365         nsegs = -1;
  366         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  367         ++nsegs;
  368 
  369         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  370         if (error)
  371                 (*callback)(callback_arg, segs, 0, 0, error);
  372         else
  373                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  374 
  375         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  376             __func__, dmat, flags, error, nsegs);
  377         return (error);
  378 }
  379 
  380 int
  381 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  382     bus_dma_segment_t *segs, int *nsegs, int flags)
  383 {
  384         int error;
  385 
  386         flags |= BUS_DMA_NOWAIT;
  387         *nsegs = -1;
  388         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  389         ++*nsegs;
  390         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  391         return (error);
  392 }
  393 
  394 int
  395 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  396     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  397 {
  398         bus_dma_segment_t *segs;
  399         int nsegs, error;
  400 
  401         flags |= BUS_DMA_NOWAIT;
  402         nsegs = -1;
  403         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  404         nsegs++;
  405 
  406         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  407         if (error)
  408                 (*callback)(callback_arg, segs, 0, 0, error);
  409         else
  410                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  411 
  412         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  413             __func__, dmat, flags, error, nsegs);
  414         return (error);
  415 }
  416 
  417 int
  418 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  419                     bus_dmamap_callback_t *callback, void *callback_arg,
  420                     int flags)
  421 {
  422         bus_dma_segment_t *segs;
  423         struct ccb_hdr *ccb_h;
  424         struct memdesc mem;
  425         int error;
  426         int nsegs;
  427 
  428         ccb_h = &ccb->ccb_h;
  429         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  430                 callback(callback_arg, NULL, 0, 0);
  431                 return (0);
  432         }
  433         if ((flags & BUS_DMA_NOWAIT) == 0) {
  434                 mem = memdesc_ccb(ccb);
  435                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  436         }
  437         nsegs = -1;
  438         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  439         nsegs++;
  440 
  441         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  442             __func__, dmat, flags, error, nsegs);
  443 
  444         if (error == EINPROGRESS)
  445                 return (error);
  446 
  447         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  448         if (error)
  449                 (*callback)(callback_arg, segs, 0, error);
  450         else
  451                 (*callback)(callback_arg, segs, nsegs, error);
  452         /*
  453          * Return ENOMEM to the caller so that it can pass it up the stack.
  454          * This error only happens when NOWAIT is set, so deferral is disabled.
  455          */
  456         if (error == ENOMEM)
  457                 return (error);
  458 
  459         return (0);
  460 }
  461 
  462 int
  463 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  464                     bus_dmamap_callback_t *callback, void *callback_arg,
  465                     int flags)
  466 {
  467         bus_dma_segment_t *segs;
  468         struct memdesc mem;
  469         int error;
  470         int nsegs;
  471 
  472         if ((flags & BUS_DMA_NOWAIT) == 0) {
  473                 mem = memdesc_bio(bio);
  474                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  475         }
  476         nsegs = -1;
  477         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  478         nsegs++;
  479 
  480         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  481             __func__, dmat, flags, error, nsegs);
  482 
  483         if (error == EINPROGRESS)
  484                 return (error);
  485 
  486         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  487         if (error)
  488                 (*callback)(callback_arg, segs, 0, error);
  489         else
  490                 (*callback)(callback_arg, segs, nsegs, error);
  491         /*
  492          * Return ENOMEM to the caller so that it can pass it up the stack.
  493          * This error only happens when NOWAIT is set, so deferral is disabled.
  494          */
  495         if (error == ENOMEM)
  496                 return (error);
  497 
  498         return (0);
  499 }
  500 
  501 int
  502 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  503     struct memdesc *mem, bus_dmamap_callback_t *callback,
  504     void *callback_arg, int flags)
  505 {
  506         bus_dma_segment_t *segs;
  507         int error;
  508         int nsegs;
  509 
  510         if ((flags & BUS_DMA_NOWAIT) == 0)
  511                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  512 
  513         nsegs = -1;
  514         error = 0;
  515         switch (mem->md_type) {
  516         case MEMDESC_VADDR:
  517                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  518                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  519                 break;
  520         case MEMDESC_PADDR:
  521                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  522                     mem->md_opaque, flags, NULL, &nsegs);
  523                 break;
  524         case MEMDESC_VLIST:
  525                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  526                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
  527                 break;
  528         case MEMDESC_PLIST:
  529                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  530                     mem->md_opaque, &nsegs, flags);
  531                 break;
  532         case MEMDESC_BIO:
  533                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  534                     &nsegs, flags);
  535                 break;
  536         case MEMDESC_UIO:
  537                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  538                     &nsegs, flags);
  539                 break;
  540         case MEMDESC_MBUF:
  541                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  542                     NULL, &nsegs, flags);
  543                 break;
  544         case MEMDESC_CCB:
  545                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  546                     flags);
  547                 break;
  548         }
  549         nsegs++;
  550 
  551         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  552             __func__, dmat, flags, error, nsegs);
  553 
  554         if (error == EINPROGRESS)
  555                 return (error);
  556 
  557         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  558         if (error)
  559                 (*callback)(callback_arg, segs, 0, error);
  560         else
  561                 (*callback)(callback_arg, segs, nsegs, 0);
  562 
  563         /*
  564          * Return ENOMEM to the caller so that it can pass it up the stack.
  565          * This error only happens when NOWAIT is set, so deferral is disabled.
  566          */
  567         if (error == ENOMEM)
  568                 return (error);
  569 
  570         return (0);
  571 }
Cache object: 90c3d07d1db93a85f639296648aa9900
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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
