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/lock.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/memdesc.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/uio.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_page.h>
   54 #include <vm/vm_map.h>
   55 #include <vm/pmap.h>
   56 
   57 #include <cam/cam.h>
   58 #include <cam/cam_ccb.h>
   59 
   60 #include <opencrypto/cryptodev.h>
   61 
   62 #include <machine/bus.h>
   63 
   64 /*
   65  * Convenience function for manipulating driver locks from busdma (during
   66  * busdma_swi, for example).
   67  */
   68 void
   69 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
   70 {
   71         struct mtx *dmtx;
   72 
   73         dmtx = (struct mtx *)arg;
   74         switch (op) {
   75         case BUS_DMA_LOCK:
   76                 mtx_lock(dmtx);
   77                 break;
   78         case BUS_DMA_UNLOCK:
   79                 mtx_unlock(dmtx);
   80                 break;
   81         default:
   82                 panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
   83         }
   84 }
   85 
   86 /*
   87  * dflt_lock should never get called.  It gets put into the dma tag when
   88  * lockfunc == NULL, which is only valid if the maps that are associated
   89  * with the tag are meant to never be deferred.
   90  *
   91  * XXX Should have a way to identify which driver is responsible here.
   92  */
   93 void
   94 _busdma_dflt_lock(void *arg, bus_dma_lock_op_t op)
   95 {
   96 
   97         panic("driver error: _bus_dma_dflt_lock called");
   98 }
   99 
  100 
  101 /*
  102  * Load up data starting at offset within a region specified by a
  103  * list of virtual address ranges until either length or the region
  104  * are exhausted.
  105  */
  106 static int
  107 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
  108     bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
  109     int flags, size_t offset, size_t length)
  110 {
  111         int error;
  112 
  113         error = 0;
  114         for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
  115                 char *addr;
  116                 size_t ds_len;
  117 
  118                 KASSERT((offset < list->ds_len),
  119                     ("Invalid mid-segment offset"));
  120                 addr = (char *)(uintptr_t)list->ds_addr + offset;
  121                 ds_len = list->ds_len - offset;
  122                 offset = 0;
  123                 if (ds_len > length)
  124                         ds_len = length;
  125                 length -= ds_len;
  126                 KASSERT((ds_len != 0), ("Segment length is zero"));
  127                 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
  128                     flags, NULL, nsegs);
  129                 if (error)
  130                         break;
  131         }
  132         return (error);
  133 }
  134 
  135 /*
  136  * Load a list of physical addresses.
  137  */
  138 static int
  139 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
  140     bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
  141 {
  142         int error;
  143 
  144         error = 0;
  145         for (; sglist_cnt > 0; sglist_cnt--, list++) {
  146                 error = _bus_dmamap_load_phys(dmat, map,
  147                     (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
  148                     nsegs);
  149                 if (error)
  150                         break;
  151         }
  152         return (error);
  153 }
  154 
  155 /*
  156  * Load an unmapped mbuf
  157  */
  158 static int
  159 _bus_dmamap_load_mbuf_epg(bus_dma_tag_t dmat, bus_dmamap_t map,
  160     struct mbuf *m, bus_dma_segment_t *segs, int *nsegs, int flags)
  161 {
  162         int error, i, off, len, pglen, pgoff, seglen, segoff;
  163 
  164         M_ASSERTEXTPG(m);
  165 
  166         len = m->m_len;
  167         error = 0;
  168 
  169         /* Skip over any data removed from the front. */
  170         off = mtod(m, vm_offset_t);
  171 
  172         if (m->m_epg_hdrlen != 0) {
  173                 if (off >= m->m_epg_hdrlen) {
  174                         off -= m->m_epg_hdrlen;
  175                 } else {
  176                         seglen = m->m_epg_hdrlen - off;
  177                         segoff = off;
  178                         seglen = min(seglen, len);
  179                         off = 0;
  180                         len -= seglen;
  181                         error = _bus_dmamap_load_buffer(dmat, map,
  182                             &m->m_epg_hdr[segoff], seglen, kernel_pmap,
  183                             flags, segs, nsegs);
  184                 }
  185         }
  186         pgoff = m->m_epg_1st_off;
  187         for (i = 0; i < m->m_epg_npgs && error == 0 && len > 0; i++) {
  188                 pglen = m_epg_pagelen(m, i, pgoff);
  189                 if (off >= pglen) {
  190                         off -= pglen;
  191                         pgoff = 0;
  192                         continue;
  193                 }
  194                 seglen = pglen - off;
  195                 segoff = pgoff + off;
  196                 off = 0;
  197                 seglen = min(seglen, len);
  198                 len -= seglen;
  199                 error = _bus_dmamap_load_phys(dmat, map,
  200                     m->m_epg_pa[i] + segoff, seglen, flags, segs, nsegs);
  201                 pgoff = 0;
  202         };
  203         if (len != 0 && error == 0) {
  204                 KASSERT((off + len) <= m->m_epg_trllen,
  205                     ("off + len > trail (%d + %d > %d)", off, len,
  206                     m->m_epg_trllen));
  207                 error = _bus_dmamap_load_buffer(dmat, map,
  208                     &m->m_epg_trail[off], len, kernel_pmap, flags, segs,
  209                     nsegs);
  210         }
  211         return (error);
  212 }
  213 
  214 /*
  215  * Load a single mbuf.
  216  */
  217 static int
  218 _bus_dmamap_load_single_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
  219     struct mbuf *m, bus_dma_segment_t *segs, int *nsegs, int flags)
  220 {
  221         int error;
  222 
  223         error = 0;
  224         if ((m->m_flags & M_EXTPG) != 0)
  225                 error = _bus_dmamap_load_mbuf_epg(dmat, map, m, segs, nsegs,
  226                     flags);
  227         else
  228                 error = _bus_dmamap_load_buffer(dmat, map, m->m_data, m->m_len,
  229                     kernel_pmap, flags | BUS_DMA_LOAD_MBUF, segs, nsegs);
  230         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  231             __func__, dmat, flags, error, *nsegs);
  232         return (error);
  233 }
  234 
  235 /*
  236  * Load an mbuf chain.
  237  */
  238 static int
  239 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
  240     struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
  241 {
  242         struct mbuf *m;
  243         int error;
  244 
  245         error = 0;
  246         for (m = m0; m != NULL && error == 0; m = m->m_next) {
  247                 if (m->m_len > 0) {
  248                         if ((m->m_flags & M_EXTPG) != 0)
  249                                 error = _bus_dmamap_load_mbuf_epg(dmat,
  250                                     map, m, segs, nsegs, flags);
  251                         else
  252                                 error = _bus_dmamap_load_buffer(dmat, map,
  253                                     m->m_data, m->m_len, kernel_pmap,
  254                                     flags | BUS_DMA_LOAD_MBUF, segs, nsegs);
  255                 }
  256         }
  257         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  258             __func__, dmat, flags, error, *nsegs);
  259         return (error);
  260 }
  261 
  262 /*
  263  * Load from block io.
  264  */
  265 static int
  266 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  267     int *nsegs, int flags)
  268 {
  269 
  270         if ((bio->bio_flags & BIO_VLIST) != 0) {
  271                 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
  272                 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
  273                     kernel_pmap, nsegs, flags, bio->bio_ma_offset,
  274                     bio->bio_bcount));
  275         }
  276 
  277         if ((bio->bio_flags & BIO_UNMAPPED) != 0)
  278                 return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
  279                     bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
  280 
  281         return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
  282             bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
  283 }
  284 
  285 int
  286 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
  287     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
  288     bus_dma_segment_t *segs, int *segp)
  289 {
  290         vm_paddr_t paddr;
  291         bus_size_t len;
  292         int error, i;
  293 
  294         error = 0;
  295         for (i = 0; tlen > 0; i++, tlen -= len) {
  296                 len = min(PAGE_SIZE - ma_offs, tlen);
  297                 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
  298                 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
  299                     flags, segs, segp);
  300                 if (error != 0)
  301                         break;
  302                 ma_offs = 0;
  303         }
  304         return (error);
  305 }
  306 
  307 /*
  308  * Load a cam control block.
  309  */
  310 static int
  311 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  312                     int *nsegs, int flags)
  313 {
  314         struct ccb_hdr *ccb_h;
  315         void *data_ptr;
  316         int error;
  317         uint32_t dxfer_len;
  318         uint16_t sglist_cnt;
  319 
  320         error = 0;
  321         ccb_h = &ccb->ccb_h;
  322         switch (ccb_h->func_code) {
  323         case XPT_SCSI_IO: {
  324                 struct ccb_scsiio *csio;
  325 
  326                 csio = &ccb->csio;
  327                 data_ptr = csio->data_ptr;
  328                 dxfer_len = csio->dxfer_len;
  329                 sglist_cnt = csio->sglist_cnt;
  330                 break;
  331         }
  332         case XPT_CONT_TARGET_IO: {
  333                 struct ccb_scsiio *ctio;
  334 
  335                 ctio = &ccb->ctio;
  336                 data_ptr = ctio->data_ptr;
  337                 dxfer_len = ctio->dxfer_len;
  338                 sglist_cnt = ctio->sglist_cnt;
  339                 break;
  340         }
  341         case XPT_ATA_IO: {
  342                 struct ccb_ataio *ataio;
  343 
  344                 ataio = &ccb->ataio;
  345                 data_ptr = ataio->data_ptr;
  346                 dxfer_len = ataio->dxfer_len;
  347                 sglist_cnt = 0;
  348                 break;
  349         }
  350         case XPT_NVME_IO:
  351         case XPT_NVME_ADMIN: {
  352                 struct ccb_nvmeio *nvmeio;
  353 
  354                 nvmeio = &ccb->nvmeio;
  355                 data_ptr = nvmeio->data_ptr;
  356                 dxfer_len = nvmeio->dxfer_len;
  357                 sglist_cnt = nvmeio->sglist_cnt;
  358                 break;
  359         }
  360         default:
  361                 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
  362                     ccb_h->func_code);
  363         }
  364 
  365         switch ((ccb_h->flags & CAM_DATA_MASK)) {
  366         case CAM_DATA_VADDR:
  367                 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
  368                     kernel_pmap, flags, NULL, nsegs);
  369                 break;
  370         case CAM_DATA_PADDR:
  371                 error = _bus_dmamap_load_phys(dmat, map,
  372                     (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
  373                     nsegs);
  374                 break;
  375         case CAM_DATA_SG:
  376                 error = _bus_dmamap_load_vlist(dmat, map,
  377                     (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
  378                     nsegs, flags, 0, dxfer_len);
  379                 break;
  380         case CAM_DATA_SG_PADDR:
  381                 error = _bus_dmamap_load_plist(dmat, map,
  382                     (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
  383                 break;
  384         case CAM_DATA_BIO:
  385                 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
  386                     nsegs, flags);
  387                 break;
  388         default:
  389                 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
  390                     ccb_h->flags);
  391         }
  392         return (error);
  393 }
  394 
  395 /*
  396  * Load a uio.
  397  */
  398 static int
  399 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  400     int *nsegs, int flags)
  401 {
  402         bus_size_t resid;
  403         bus_size_t minlen;
  404         struct iovec *iov;
  405         pmap_t pmap;
  406         caddr_t addr;
  407         int error, i;
  408 
  409         if (uio->uio_segflg == UIO_USERSPACE) {
  410                 KASSERT(uio->uio_td != NULL,
  411                         ("bus_dmamap_load_uio: USERSPACE but no proc"));
  412                 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
  413         } else
  414                 pmap = kernel_pmap;
  415         resid = uio->uio_resid;
  416         iov = uio->uio_iov;
  417         error = 0;
  418 
  419         for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
  420                 /*
  421                  * Now at the first iovec to load.  Load each iovec
  422                  * until we have exhausted the residual count.
  423                  */
  424 
  425                 addr = (caddr_t) iov[i].iov_base;
  426                 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
  427                 if (minlen > 0) {
  428                         error = _bus_dmamap_load_buffer(dmat, map, addr,
  429                             minlen, pmap, flags, NULL, nsegs);
  430                         resid -= minlen;
  431                 }
  432         }
  433 
  434         return (error);
  435 }
  436 
  437 /*
  438  * Map the buffer buf into bus space using the dmamap map.
  439  */
  440 int
  441 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  442     bus_size_t buflen, bus_dmamap_callback_t *callback,
  443     void *callback_arg, int flags)
  444 {
  445         bus_dma_segment_t *segs;
  446         struct memdesc mem;
  447         int error;
  448         int nsegs;
  449 
  450 #ifdef KMSAN
  451         mem = memdesc_vaddr(buf, buflen);
  452         _bus_dmamap_load_kmsan(dmat, map, &mem);
  453 #endif
  454 
  455         if ((flags & BUS_DMA_NOWAIT) == 0) {
  456                 mem = memdesc_vaddr(buf, buflen);
  457                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  458         }
  459 
  460         nsegs = -1;
  461         error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
  462             flags, NULL, &nsegs);
  463         nsegs++;
  464 
  465         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  466             __func__, dmat, flags, error, nsegs);
  467 
  468         if (error == EINPROGRESS)
  469                 return (error);
  470 
  471         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  472         if (error)
  473                 (*callback)(callback_arg, segs, 0, error);
  474         else
  475                 (*callback)(callback_arg, segs, nsegs, 0);
  476 
  477         /*
  478          * Return ENOMEM to the caller so that it can pass it up the stack.
  479          * This error only happens when NOWAIT is set, so deferral is disabled.
  480          */
  481         if (error == ENOMEM)
  482                 return (error);
  483 
  484         return (0);
  485 }
  486 
  487 int
  488 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  489     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  490 {
  491         bus_dma_segment_t *segs;
  492         int nsegs, error;
  493 
  494         M_ASSERTPKTHDR(m0);
  495 
  496 #ifdef KMSAN
  497         struct memdesc mem = memdesc_mbuf(m0);
  498         _bus_dmamap_load_kmsan(dmat, map, &mem);
  499 #endif
  500 
  501         flags |= BUS_DMA_NOWAIT;
  502         nsegs = -1;
  503         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
  504         ++nsegs;
  505 
  506         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  507         if (error)
  508                 (*callback)(callback_arg, segs, 0, 0, error);
  509         else
  510                 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
  511 
  512         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  513             __func__, dmat, flags, error, nsegs);
  514         return (error);
  515 }
  516 
  517 int
  518 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
  519     bus_dma_segment_t *segs, int *nsegs, int flags)
  520 {
  521         int error;
  522 
  523 #ifdef KMSAN
  524         struct memdesc mem = memdesc_mbuf(m0);
  525         _bus_dmamap_load_kmsan(dmat, map, &mem);
  526 #endif
  527 
  528         flags |= BUS_DMA_NOWAIT;
  529         *nsegs = -1;
  530         error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
  531         ++*nsegs;
  532         _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
  533         return (error);
  534 }
  535 
  536 int
  537 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
  538     bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
  539 {
  540         bus_dma_segment_t *segs;
  541         int nsegs, error;
  542 
  543 #ifdef KMSAN
  544         struct memdesc mem = memdesc_uio(uio);
  545         _bus_dmamap_load_kmsan(dmat, map, &mem);
  546 #endif
  547 
  548         flags |= BUS_DMA_NOWAIT;
  549         nsegs = -1;
  550         error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
  551         nsegs++;
  552 
  553         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  554         if (error)
  555                 (*callback)(callback_arg, segs, 0, 0, error);
  556         else
  557                 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
  558 
  559         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  560             __func__, dmat, flags, error, nsegs);
  561         return (error);
  562 }
  563 
  564 int
  565 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
  566                     bus_dmamap_callback_t *callback, void *callback_arg,
  567                     int flags)
  568 {
  569         bus_dma_segment_t *segs;
  570         struct ccb_hdr *ccb_h;
  571         struct memdesc mem;
  572         int error;
  573         int nsegs;
  574 
  575 #ifdef KMSAN
  576         mem = memdesc_ccb(ccb);
  577         _bus_dmamap_load_kmsan(dmat, map, &mem);
  578 #endif
  579 
  580         ccb_h = &ccb->ccb_h;
  581         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
  582                 callback(callback_arg, NULL, 0, 0);
  583                 return (0);
  584         }
  585         if ((flags & BUS_DMA_NOWAIT) == 0) {
  586                 mem = memdesc_ccb(ccb);
  587                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  588         }
  589         nsegs = -1;
  590         error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
  591         nsegs++;
  592 
  593         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  594             __func__, dmat, flags, error, nsegs);
  595 
  596         if (error == EINPROGRESS)
  597                 return (error);
  598 
  599         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  600         if (error)
  601                 (*callback)(callback_arg, segs, 0, error);
  602         else
  603                 (*callback)(callback_arg, segs, nsegs, error);
  604         /*
  605          * Return ENOMEM to the caller so that it can pass it up the stack.
  606          * This error only happens when NOWAIT is set, so deferral is disabled.
  607          */
  608         if (error == ENOMEM)
  609                 return (error);
  610 
  611         return (0);
  612 }
  613 
  614 int
  615 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
  616                     bus_dmamap_callback_t *callback, void *callback_arg,
  617                     int flags)
  618 {
  619         bus_dma_segment_t *segs;
  620         struct memdesc mem;
  621         int error;
  622         int nsegs;
  623 
  624 #ifdef KMSAN
  625         mem = memdesc_bio(bio);
  626         _bus_dmamap_load_kmsan(dmat, map, &mem);
  627 #endif
  628 
  629         if ((flags & BUS_DMA_NOWAIT) == 0) {
  630                 mem = memdesc_bio(bio);
  631                 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
  632         }
  633         nsegs = -1;
  634         error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
  635         nsegs++;
  636 
  637         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  638             __func__, dmat, flags, error, nsegs);
  639 
  640         if (error == EINPROGRESS)
  641                 return (error);
  642 
  643         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  644         if (error)
  645                 (*callback)(callback_arg, segs, 0, error);
  646         else
  647                 (*callback)(callback_arg, segs, nsegs, error);
  648         /*
  649          * Return ENOMEM to the caller so that it can pass it up the stack.
  650          * This error only happens when NOWAIT is set, so deferral is disabled.
  651          */
  652         if (error == ENOMEM)
  653                 return (error);
  654 
  655         return (0);
  656 }
  657 
  658 int
  659 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
  660     struct memdesc *mem, bus_dmamap_callback_t *callback,
  661     void *callback_arg, int flags)
  662 {
  663         bus_dma_segment_t *segs;
  664         int error;
  665         int nsegs;
  666 
  667 #ifdef KMSAN
  668         _bus_dmamap_load_kmsan(dmat, map, mem);
  669 #endif
  670 
  671         if ((flags & BUS_DMA_NOWAIT) == 0)
  672                 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
  673 
  674         nsegs = -1;
  675         error = 0;
  676         switch (mem->md_type) {
  677         case MEMDESC_VADDR:
  678                 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
  679                     mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
  680                 break;
  681         case MEMDESC_PADDR:
  682                 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
  683                     mem->md_opaque, flags, NULL, &nsegs);
  684                 break;
  685         case MEMDESC_VLIST:
  686                 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
  687                     mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
  688                 break;
  689         case MEMDESC_PLIST:
  690                 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
  691                     mem->md_opaque, &nsegs, flags);
  692                 break;
  693         case MEMDESC_BIO:
  694                 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
  695                     &nsegs, flags);
  696                 break;
  697         case MEMDESC_UIO:
  698                 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
  699                     &nsegs, flags);
  700                 break;
  701         case MEMDESC_MBUF:
  702                 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
  703                     NULL, &nsegs, flags);
  704                 break;
  705         case MEMDESC_CCB:
  706                 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
  707                     flags);
  708                 break;
  709         }
  710         nsegs++;
  711 
  712         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  713             __func__, dmat, flags, error, nsegs);
  714 
  715         if (error == EINPROGRESS)
  716                 return (error);
  717 
  718         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  719         if (error)
  720                 (*callback)(callback_arg, segs, 0, error);
  721         else
  722                 (*callback)(callback_arg, segs, nsegs, 0);
  723 
  724         /*
  725          * Return ENOMEM to the caller so that it can pass it up the stack.
  726          * This error only happens when NOWAIT is set, so deferral is disabled.
  727          */
  728         if (error == ENOMEM)
  729                 return (error);
  730 
  731         return (0);
  732 }
  733 
  734 int
  735 bus_dmamap_load_crp_buffer(bus_dma_tag_t dmat, bus_dmamap_t map,
  736     struct crypto_buffer *cb, bus_dmamap_callback_t *callback,
  737     void *callback_arg, int flags)
  738 {
  739         bus_dma_segment_t *segs;
  740         int error;
  741         int nsegs;
  742 
  743         flags |= BUS_DMA_NOWAIT;
  744         nsegs = -1;
  745         error = 0;
  746         switch (cb->cb_type) {
  747         case CRYPTO_BUF_CONTIG:
  748                 error = _bus_dmamap_load_buffer(dmat, map, cb->cb_buf,
  749                     cb->cb_buf_len, kernel_pmap, flags, NULL, &nsegs);
  750                 break;
  751         case CRYPTO_BUF_MBUF:
  752                 error = _bus_dmamap_load_mbuf_sg(dmat, map, cb->cb_mbuf,
  753                     NULL, &nsegs, flags);
  754                 break;
  755         case CRYPTO_BUF_SINGLE_MBUF:
  756                 error = _bus_dmamap_load_single_mbuf(dmat, map, cb->cb_mbuf,
  757                     NULL, &nsegs, flags);
  758                 break;
  759         case CRYPTO_BUF_UIO:
  760                 error = _bus_dmamap_load_uio(dmat, map, cb->cb_uio, &nsegs,
  761                     flags);
  762                 break;
  763         case CRYPTO_BUF_VMPAGE:
  764                 error = _bus_dmamap_load_ma(dmat, map, cb->cb_vm_page,
  765                     cb->cb_vm_page_len, cb->cb_vm_page_offset, flags, NULL,
  766                     &nsegs);
  767                 break;
  768         default:
  769                 error = EINVAL;
  770         }
  771         nsegs++;
  772 
  773         CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
  774             __func__, dmat, flags, error, nsegs);
  775 
  776         if (error == EINPROGRESS)
  777                 return (error);
  778 
  779         segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
  780         if (error)
  781                 (*callback)(callback_arg, segs, 0, error);
  782         else
  783                 (*callback)(callback_arg, segs, nsegs, 0);
  784 
  785         /*
  786          * Return ENOMEM to the caller so that it can pass it up the stack.
  787          * This error only happens when NOWAIT is set, so deferral is disabled.
  788          */
  789         if (error == ENOMEM)
  790                 return (error);
  791 
  792         return (0);
  793 }
  794 
  795 int
  796 bus_dmamap_load_crp(bus_dma_tag_t dmat, bus_dmamap_t map, struct cryptop *crp,
  797     bus_dmamap_callback_t *callback, void *callback_arg, int flags)
  798 {
  799         return (bus_dmamap_load_crp_buffer(dmat, map, &crp->crp_buf, callback,
  800             callback_arg, flags));
  801 }
  802 
  803 void
  804 bus_dma_template_init(bus_dma_template_t *t, bus_dma_tag_t parent)
  805 {
  806 
  807         if (t == NULL)
  808                 return;
  809 
  810         t->parent = parent;
  811         t->alignment = 1;
  812         t->boundary = 0;
  813         t->lowaddr = t->highaddr = BUS_SPACE_MAXADDR;
  814         t->maxsize = t->maxsegsize = BUS_SPACE_MAXSIZE;
  815         t->nsegments = BUS_SPACE_UNRESTRICTED;
  816         t->lockfunc = NULL;
  817         t->lockfuncarg = NULL;
  818         t->flags = 0;
  819 }
  820 
  821 int
  822 bus_dma_template_tag(bus_dma_template_t *t, bus_dma_tag_t *dmat)
  823 {
  824 
  825         if (t == NULL || dmat == NULL)
  826                 return (EINVAL);
  827 
  828         return (bus_dma_tag_create(t->parent, t->alignment, t->boundary,
  829             t->lowaddr, t->highaddr, NULL, NULL, t->maxsize,
  830             t->nsegments, t->maxsegsize, t->flags, t->lockfunc, t->lockfuncarg,
  831             dmat));
  832 }
  833 
  834 void
  835 bus_dma_template_fill(bus_dma_template_t *t, bus_dma_param_t *kv, u_int count)
  836 {
  837         bus_dma_param_t *pkv;
  838 
  839         while (count) {
  840                 pkv = &kv[--count];
  841                 switch (pkv->key) {
  842                 case BD_PARAM_PARENT:
  843                         t->parent = pkv->ptr;
  844                         break;
  845                 case BD_PARAM_ALIGNMENT:
  846                         t->alignment = pkv->num;
  847                         break;
  848                 case BD_PARAM_BOUNDARY:
  849                         t->boundary = pkv->num;
  850                         break;
  851                 case BD_PARAM_LOWADDR:
  852                         t->lowaddr = pkv->pa;
  853                         break;
  854                 case BD_PARAM_HIGHADDR:
  855                         t->highaddr = pkv->pa;
  856                         break;
  857                 case BD_PARAM_MAXSIZE:
  858                         t->maxsize = pkv->num;
  859                         break;
  860                 case BD_PARAM_NSEGMENTS:
  861                         t->nsegments = pkv->num;
  862                         break;
  863                 case BD_PARAM_MAXSEGSIZE:
  864                         t->maxsegsize = pkv->num;
  865                         break;
  866                 case BD_PARAM_FLAGS:
  867                         t->flags = pkv->num;
  868                         break;
  869                 case BD_PARAM_LOCKFUNC:
  870                         t->lockfunc = pkv->ptr;
  871                         break;
  872                 case BD_PARAM_LOCKFUNCARG:
  873                         t->lockfuncarg = pkv->ptr;
  874                         break;
  875                 case BD_PARAM_NAME:
  876                         t->name = pkv->ptr;
  877                         break;
  878                 case BD_PARAM_INVALID:
  879                 default:
  880                         KASSERT(0, ("Invalid key %d\n", pkv->key));
  881                         break;
  882                 }
  883         }
  884         return;
  885 }
  886 
  887 #ifndef IOMMU
  888 bool bus_dma_iommu_set_buswide(device_t dev);
  889 int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  890     vm_paddr_t start, vm_size_t length, int flags);
  891 
  892 bool
  893 bus_dma_iommu_set_buswide(device_t dev)
  894 {
  895         return (false);
  896 }
  897 
  898 int
  899 bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
  900     vm_paddr_t start, vm_size_t length, int flags)
  901 {
  902         return (0);
  903 }
  904 #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
