busdma_machdep.c revision 69781
132516Sgibbs/* 240029Sgibbs * Copyright (c) 1997, 1998 Justin T. Gibbs. 332516Sgibbs * All rights reserved. 432516Sgibbs * 532516Sgibbs * Redistribution and use in source and binary forms, with or without 632516Sgibbs * modification, are permitted provided that the following conditions 732516Sgibbs * are met: 832516Sgibbs * 1. Redistributions of source code must retain the above copyright 932516Sgibbs * notice, this list of conditions, and the following disclaimer, 1032516Sgibbs * without modification, immediately at the beginning of the file. 1132516Sgibbs * 2. The name of the author may not be used to endorse or promote products 1232516Sgibbs * derived from this software without specific prior written permission. 1332516Sgibbs * 1432516Sgibbs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1532516Sgibbs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1632516Sgibbs * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1732516Sgibbs * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 1832516Sgibbs * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1932516Sgibbs * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2032516Sgibbs * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2132516Sgibbs * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2232516Sgibbs * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2332516Sgibbs * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2432516Sgibbs * SUCH DAMAGE. 2532516Sgibbs * 2650477Speter * $FreeBSD: head/sys/i386/i386/busdma_machdep.c 69781 2000-12-08 21:51:06Z dwmalone $ 2732516Sgibbs */ 2832516Sgibbs 2932516Sgibbs#include <sys/param.h> 3032516Sgibbs#include <sys/systm.h> 3132516Sgibbs#include <sys/malloc.h> 3267551Sjhb#include <sys/bus.h> 3367551Sjhb#include <sys/interrupt.h> 3432516Sgibbs 3532516Sgibbs#include <vm/vm.h> 3632516Sgibbs#include <vm/vm_page.h> 3732516Sgibbs 3832516Sgibbs#include <machine/bus.h> 3932516Sgibbs#include <machine/md_var.h> 4032516Sgibbs 4132516Sgibbs#define MAX(a,b) (((a) > (b)) ? (a) : (b)) 4232516Sgibbs#define MIN(a,b) (((a) < (b)) ? (a) : (b)) 4332516Sgibbs#define MAX_BPAGES 128 4432516Sgibbs 4532516Sgibbsstruct bus_dma_tag { 4632516Sgibbs bus_dma_tag_t parent; 4735767Sgibbs bus_size_t alignment; 4832516Sgibbs bus_size_t boundary; 4932516Sgibbs bus_addr_t lowaddr; 5032516Sgibbs bus_addr_t highaddr; 5132516Sgibbs bus_dma_filter_t *filter; 5232516Sgibbs void *filterarg; 5332516Sgibbs bus_size_t maxsize; 5435767Sgibbs u_int nsegments; 5532516Sgibbs bus_size_t maxsegsz; 5632516Sgibbs int flags; 5732516Sgibbs int ref_count; 5832516Sgibbs int map_count; 5932516Sgibbs}; 6032516Sgibbs 6132516Sgibbsstruct bounce_page { 6232516Sgibbs vm_offset_t vaddr; /* kva of bounce buffer */ 6332516Sgibbs bus_addr_t busaddr; /* Physical address */ 6432516Sgibbs vm_offset_t datavaddr; /* kva of client data */ 6532516Sgibbs bus_size_t datacount; /* client data count */ 6660938Sjake STAILQ_ENTRY(bounce_page) links; 6732516Sgibbs}; 6832516Sgibbs 6932516Sgibbsint busdma_swi_pending; 7032516Sgibbs 7160938Sjakestatic STAILQ_HEAD(bp_list, bounce_page) bounce_page_list; 7232516Sgibbsstatic int free_bpages; 7332516Sgibbsstatic int reserved_bpages; 7432516Sgibbsstatic int active_bpages; 7532516Sgibbsstatic int total_bpages; 7632516Sgibbsstatic bus_addr_t bounce_lowaddr = BUS_SPACE_MAXADDR; 7732516Sgibbs 7832516Sgibbsstruct bus_dmamap { 7932516Sgibbs struct bp_list bpages; 8032516Sgibbs int pagesneeded; 8132516Sgibbs int pagesreserved; 8232516Sgibbs bus_dma_tag_t dmat; 8332516Sgibbs void *buf; /* unmapped buffer pointer */ 8432516Sgibbs bus_size_t buflen; /* unmapped buffer length */ 8532516Sgibbs bus_dmamap_callback_t *callback; 8632516Sgibbs void *callback_arg; 8760938Sjake STAILQ_ENTRY(bus_dmamap) links; 8832516Sgibbs}; 8932516Sgibbs 9060938Sjakestatic STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist; 9160938Sjakestatic STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist; 9232516Sgibbsstatic struct bus_dmamap nobounce_dmamap; 9332516Sgibbs 9432516Sgibbsstatic int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages); 9532516Sgibbsstatic int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map); 9632516Sgibbsstatic vm_offset_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, 9732516Sgibbs vm_offset_t vaddr, bus_size_t size); 9832516Sgibbsstatic void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage); 9932516Sgibbsstatic __inline int run_filter(bus_dma_tag_t dmat, bus_addr_t paddr); 10032516Sgibbs 10132516Sgibbsstatic __inline int 10232516Sgibbsrun_filter(bus_dma_tag_t dmat, bus_addr_t paddr) 10332516Sgibbs{ 10432516Sgibbs int retval; 10532516Sgibbs 10632516Sgibbs retval = 0; 10732516Sgibbs do { 10832516Sgibbs if (paddr > dmat->lowaddr 10932516Sgibbs && paddr <= dmat->highaddr 11032516Sgibbs && (dmat->filter == NULL 11132516Sgibbs || (*dmat->filter)(dmat->filterarg, paddr) != 0)) 11232516Sgibbs retval = 1; 11332516Sgibbs 11432516Sgibbs dmat = dmat->parent; 11532516Sgibbs } while (retval == 0 && dmat != NULL); 11632516Sgibbs return (retval); 11732516Sgibbs} 11832516Sgibbs 11935767Sgibbs#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4 12032516Sgibbs/* 12132516Sgibbs * Allocate a device specific dma_tag. 12232516Sgibbs */ 12332516Sgibbsint 12435767Sgibbsbus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 12535767Sgibbs bus_size_t boundary, bus_addr_t lowaddr, 12635767Sgibbs bus_addr_t highaddr, bus_dma_filter_t *filter, 12735767Sgibbs void *filterarg, bus_size_t maxsize, int nsegments, 12835767Sgibbs bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat) 12932516Sgibbs{ 13032516Sgibbs bus_dma_tag_t newtag; 13132516Sgibbs int error = 0; 13232516Sgibbs 13332516Sgibbs /* Return a NULL tag on failure */ 13432516Sgibbs *dmat = NULL; 13532516Sgibbs 13632516Sgibbs newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT); 13732516Sgibbs if (newtag == NULL) 13832516Sgibbs return (ENOMEM); 13932516Sgibbs 14032516Sgibbs newtag->parent = parent; 14148449Smjacob newtag->alignment = alignment; 14232516Sgibbs newtag->boundary = boundary; 14340286Sdg newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1); 14440286Sdg newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1); 14532516Sgibbs newtag->filter = filter; 14632516Sgibbs newtag->filterarg = filterarg; 14732516Sgibbs newtag->maxsize = maxsize; 14832516Sgibbs newtag->nsegments = nsegments; 14932516Sgibbs newtag->maxsegsz = maxsegsz; 15032516Sgibbs newtag->flags = flags; 15132516Sgibbs newtag->ref_count = 1; /* Count ourself */ 15232516Sgibbs newtag->map_count = 0; 15332516Sgibbs 15432516Sgibbs /* Take into account any restrictions imposed by our parent tag */ 15532516Sgibbs if (parent != NULL) { 15632516Sgibbs newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr); 15732516Sgibbs newtag->highaddr = MAX(parent->highaddr, newtag->highaddr); 15832516Sgibbs /* 15932516Sgibbs * XXX Not really correct??? Probably need to honor boundary 16032516Sgibbs * all the way up the inheritence chain. 16132516Sgibbs */ 16235767Sgibbs newtag->boundary = MAX(parent->boundary, newtag->boundary); 16332516Sgibbs if (newtag->filter == NULL) { 16432516Sgibbs /* 16532516Sgibbs * Short circuit looking at our parent directly 16635256Sdes * since we have encapsulated all of its information 16732516Sgibbs */ 16832516Sgibbs newtag->filter = parent->filter; 16932516Sgibbs newtag->filterarg = parent->filterarg; 17032516Sgibbs newtag->parent = parent->parent; 17132516Sgibbs } 17232516Sgibbs if (newtag->parent != NULL) { 17332516Sgibbs parent->ref_count++; 17432516Sgibbs } 17532516Sgibbs } 17632516Sgibbs 17735767Sgibbs if (newtag->lowaddr < ptoa(Maxmem) && (flags & BUS_DMA_ALLOCNOW) != 0) { 17832516Sgibbs /* Must bounce */ 17932516Sgibbs 18032516Sgibbs if (lowaddr > bounce_lowaddr) { 18132516Sgibbs /* 18232516Sgibbs * Go through the pool and kill any pages 18332516Sgibbs * that don't reside below lowaddr. 18432516Sgibbs */ 18535767Sgibbs panic("bus_dma_tag_create: page reallocation " 18632516Sgibbs "not implemented"); 18732516Sgibbs } 18832516Sgibbs if (ptoa(total_bpages) < maxsize) { 18932516Sgibbs int pages; 19032516Sgibbs 19132516Sgibbs pages = atop(maxsize) - total_bpages; 19232516Sgibbs 19332516Sgibbs /* Add pages to our bounce pool */ 19432516Sgibbs if (alloc_bounce_pages(newtag, pages) < pages) 19532516Sgibbs error = ENOMEM; 19632516Sgibbs } 19735767Sgibbs /* Performed initial allocation */ 19835767Sgibbs newtag->flags |= BUS_DMA_MIN_ALLOC_COMP; 19932516Sgibbs } 20032516Sgibbs 20132516Sgibbs if (error != 0) { 20232516Sgibbs free(newtag, M_DEVBUF); 20332516Sgibbs } else { 20432516Sgibbs *dmat = newtag; 20532516Sgibbs } 20632516Sgibbs return (error); 20732516Sgibbs} 20832516Sgibbs 20932516Sgibbsint 21032516Sgibbsbus_dma_tag_destroy(bus_dma_tag_t dmat) 21132516Sgibbs{ 21232516Sgibbs if (dmat != NULL) { 21332516Sgibbs 21432516Sgibbs if (dmat->map_count != 0) 21532516Sgibbs return (EBUSY); 21632516Sgibbs 21732516Sgibbs while (dmat != NULL) { 21832516Sgibbs bus_dma_tag_t parent; 21932516Sgibbs 22032516Sgibbs parent = dmat->parent; 22132516Sgibbs dmat->ref_count--; 22232516Sgibbs if (dmat->ref_count == 0) { 22332516Sgibbs free(dmat, M_DEVBUF); 22440029Sgibbs /* 22540029Sgibbs * Last reference count, so 22640029Sgibbs * release our reference 22740029Sgibbs * count on our parent. 22840029Sgibbs */ 22940029Sgibbs dmat = parent; 23040029Sgibbs } else 23140029Sgibbs dmat = NULL; 23232516Sgibbs } 23332516Sgibbs } 23432516Sgibbs return (0); 23532516Sgibbs} 23632516Sgibbs 23732516Sgibbs/* 23832516Sgibbs * Allocate a handle for mapping from kva/uva/physical 23932516Sgibbs * address space into bus device space. 24032516Sgibbs */ 24132516Sgibbsint 24232516Sgibbsbus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) 24332516Sgibbs{ 24432516Sgibbs int error; 24532516Sgibbs 24632516Sgibbs error = 0; 24732516Sgibbs 24832516Sgibbs if (dmat->lowaddr < ptoa(Maxmem)) { 24932516Sgibbs /* Must bounce */ 25032516Sgibbs int maxpages; 25132516Sgibbs 25232516Sgibbs *mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF, 25369781Sdwmalone M_NOWAIT | M_ZERO); 25469781Sdwmalone if (*mapp == NULL) 25535767Sgibbs return (ENOMEM); 25669781Sdwmalone 25769781Sdwmalone /* Initialize the new map */ 25869781Sdwmalone STAILQ_INIT(&((*mapp)->bpages)); 25969781Sdwmalone 26032516Sgibbs /* 26132516Sgibbs * Attempt to add pages to our pool on a per-instance 26232516Sgibbs * basis up to a sane limit. 26332516Sgibbs */ 26432516Sgibbs maxpages = MIN(MAX_BPAGES, Maxmem - atop(dmat->lowaddr)); 26535767Sgibbs if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0 26635767Sgibbs || (dmat->map_count > 0 26735767Sgibbs && total_bpages < maxpages)) { 26832516Sgibbs int pages; 26932516Sgibbs 27035767Sgibbs if (dmat->lowaddr > bounce_lowaddr) { 27135767Sgibbs /* 27235767Sgibbs * Go through the pool and kill any pages 27335767Sgibbs * that don't reside below lowaddr. 27435767Sgibbs */ 27535767Sgibbs panic("bus_dmamap_create: page reallocation " 27635767Sgibbs "not implemented"); 27735767Sgibbs } 27832516Sgibbs pages = atop(dmat->maxsize); 27932516Sgibbs pages = MIN(maxpages - total_bpages, pages); 28035767Sgibbs error = alloc_bounce_pages(dmat, pages); 28135767Sgibbs 28235767Sgibbs if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) { 28335767Sgibbs if (error == 0) 28435767Sgibbs dmat->flags |= BUS_DMA_MIN_ALLOC_COMP; 28535767Sgibbs } else { 28635767Sgibbs error = 0; 28735767Sgibbs } 28832516Sgibbs } 28932516Sgibbs } else { 29040029Sgibbs *mapp = NULL; 29132516Sgibbs } 29232516Sgibbs if (error == 0) 29332516Sgibbs dmat->map_count++; 29432516Sgibbs return (error); 29532516Sgibbs} 29632516Sgibbs 29732516Sgibbs/* 29832516Sgibbs * Destroy a handle for mapping from kva/uva/physical 29932516Sgibbs * address space into bus device space. 30032516Sgibbs */ 30132516Sgibbsint 30232516Sgibbsbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 30332516Sgibbs{ 30432516Sgibbs if (map != NULL) { 30532516Sgibbs if (STAILQ_FIRST(&map->bpages) != NULL) 30632516Sgibbs return (EBUSY); 30732516Sgibbs free(map, M_DEVBUF); 30832516Sgibbs } 30932516Sgibbs dmat->map_count--; 31032516Sgibbs return (0); 31132516Sgibbs} 31232516Sgibbs 31335767Sgibbs 31435767Sgibbs/* 31535767Sgibbs * Allocate a piece of memory that can be efficiently mapped into 31635767Sgibbs * bus device space based on the constraints lited in the dma tag. 31735767Sgibbs * A dmamap to for use with dmamap_load is also allocated. 31835767Sgibbs */ 31935767Sgibbsint 32035767Sgibbsbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 32135767Sgibbs bus_dmamap_t *mapp) 32235767Sgibbs{ 32335767Sgibbs /* If we succeed, no mapping/bouncing will be required */ 32440029Sgibbs *mapp = NULL; 32535767Sgibbs 32635767Sgibbs if ((dmat->maxsize <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem)) { 32735767Sgibbs *vaddr = malloc(dmat->maxsize, M_DEVBUF, 32835767Sgibbs (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK); 32935767Sgibbs } else { 33035767Sgibbs /* 33135767Sgibbs * XXX Use Contigmalloc until it is merged into this facility 33235767Sgibbs * and handles multi-seg allocations. Nobody is doing 33335767Sgibbs * multi-seg allocations yet though. 33435767Sgibbs */ 33535767Sgibbs *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, 33648449Smjacob (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK, 33748449Smjacob 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 33848449Smjacob dmat->boundary); 33935767Sgibbs } 34035767Sgibbs if (*vaddr == NULL) 34135767Sgibbs return (ENOMEM); 34235767Sgibbs return (0); 34335767Sgibbs} 34435767Sgibbs 34535767Sgibbs/* 34635767Sgibbs * Free a piece of memory and it's allociated dmamap, that was allocated 34735767Sgibbs * via bus_dmamem_alloc. 34835767Sgibbs */ 34935767Sgibbsvoid 35035767Sgibbsbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 35135767Sgibbs{ 35235767Sgibbs /* 35335767Sgibbs * dmamem does not need to be bounced, so the map should be 35435767Sgibbs * NULL 35535767Sgibbs */ 35649859Sgibbs if (map != NULL) 35735767Sgibbs panic("bus_dmamem_free: Invalid map freed\n"); 35840029Sgibbs /* XXX There is no "contigfree" and "free" doesn't work */ 35940029Sgibbs if ((dmat->maxsize <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem)) 36040029Sgibbs free(vaddr, M_DEVBUF); 36135767Sgibbs} 36235767Sgibbs 36332516Sgibbs#define BUS_DMAMAP_NSEGS ((BUS_SPACE_MAXSIZE / PAGE_SIZE) + 1) 36432516Sgibbs 36532516Sgibbs/* 36632516Sgibbs * Map the buffer buf into bus space using the dmamap map. 36732516Sgibbs */ 36832516Sgibbsint 36932516Sgibbsbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 37032516Sgibbs bus_size_t buflen, bus_dmamap_callback_t *callback, 37132516Sgibbs void *callback_arg, int flags) 37232516Sgibbs{ 37332516Sgibbs vm_offset_t vaddr; 37432516Sgibbs vm_offset_t paddr; 37532516Sgibbs#ifdef __GNUC__ 37632516Sgibbs bus_dma_segment_t dm_segments[dmat->nsegments]; 37732516Sgibbs#else 37832516Sgibbs bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 37932516Sgibbs#endif 38032516Sgibbs bus_dma_segment_t *sg; 38132516Sgibbs int seg; 38232516Sgibbs int error; 38348449Smjacob vm_offset_t nextpaddr; 38432516Sgibbs 38540029Sgibbs if (map == NULL) 38640029Sgibbs map = &nobounce_dmamap; 38740029Sgibbs 38832516Sgibbs error = 0; 38932516Sgibbs /* 39032516Sgibbs * If we are being called during a callback, pagesneeded will 39132516Sgibbs * be non-zero, so we can avoid doing the work twice. 39232516Sgibbs */ 39332516Sgibbs if (dmat->lowaddr < ptoa(Maxmem) && map->pagesneeded == 0) { 39432516Sgibbs vm_offset_t vendaddr; 39532516Sgibbs 39632516Sgibbs /* 39732516Sgibbs * Count the number of bounce pages 39832516Sgibbs * needed in order to complete this transfer 39932516Sgibbs */ 40040286Sdg vaddr = trunc_page((vm_offset_t)buf); 40132516Sgibbs vendaddr = (vm_offset_t)buf + buflen; 40232516Sgibbs 40332516Sgibbs while (vaddr < vendaddr) { 40432516Sgibbs paddr = pmap_kextract(vaddr); 40532516Sgibbs if (run_filter(dmat, paddr) != 0) { 40632516Sgibbs 40732516Sgibbs map->pagesneeded++; 40832516Sgibbs } 40932516Sgibbs vaddr += PAGE_SIZE; 41032516Sgibbs } 41132516Sgibbs } 41232516Sgibbs 41332516Sgibbs /* Reserve Necessary Bounce Pages */ 41432516Sgibbs if (map->pagesneeded != 0) { 41532516Sgibbs int s; 41632516Sgibbs 41732516Sgibbs s = splhigh(); 41832516Sgibbs if (reserve_bounce_pages(dmat, map) != 0) { 41932516Sgibbs 42032516Sgibbs /* Queue us for resources */ 42132516Sgibbs map->dmat = dmat; 42232516Sgibbs map->buf = buf; 42332516Sgibbs map->buflen = buflen; 42432516Sgibbs map->callback = callback; 42532516Sgibbs map->callback_arg = callback_arg; 42632516Sgibbs 42732516Sgibbs STAILQ_INSERT_TAIL(&bounce_map_waitinglist, map, links); 42832516Sgibbs splx(s); 42932516Sgibbs 43032516Sgibbs return (EINPROGRESS); 43132516Sgibbs } 43232516Sgibbs splx(s); 43332516Sgibbs } 43432516Sgibbs 43532516Sgibbs vaddr = (vm_offset_t)buf; 43632516Sgibbs sg = &dm_segments[0]; 43732516Sgibbs seg = 1; 43832516Sgibbs sg->ds_len = 0; 43932516Sgibbs 44048449Smjacob nextpaddr = 0; 44148449Smjacob do { 44248449Smjacob bus_size_t size; 44332516Sgibbs 44448449Smjacob paddr = pmap_kextract(vaddr); 44548449Smjacob size = PAGE_SIZE - (paddr & PAGE_MASK); 44648449Smjacob if (size > buflen) 44748449Smjacob size = buflen; 44832516Sgibbs 44948449Smjacob if (map->pagesneeded != 0 && run_filter(dmat, paddr)) { 45048449Smjacob paddr = add_bounce_page(dmat, map, vaddr, size); 45148449Smjacob } 45232516Sgibbs 45348449Smjacob if (sg->ds_len == 0) { 45448449Smjacob sg->ds_addr = paddr; 45548449Smjacob sg->ds_len = size; 45648449Smjacob } else if (paddr == nextpaddr) { 45748449Smjacob sg->ds_len += size; 45848449Smjacob } else { 45948449Smjacob /* Go to the next segment */ 46048449Smjacob sg++; 46148449Smjacob seg++; 46248449Smjacob if (seg > dmat->nsegments) 46348449Smjacob break; 46448449Smjacob sg->ds_addr = paddr; 46548449Smjacob sg->ds_len = size; 46648449Smjacob } 46748449Smjacob vaddr += size; 46848449Smjacob nextpaddr = paddr + size; 46948449Smjacob buflen -= size; 47032516Sgibbs 47148449Smjacob } while (buflen > 0); 47241764Sdillon 47332516Sgibbs if (buflen != 0) { 47437555Sbde printf("bus_dmamap_load: Too many segs! buf_len = 0x%lx\n", 47539755Sbde (u_long)buflen); 47632516Sgibbs error = EFBIG; 47732516Sgibbs } 47832516Sgibbs 47932516Sgibbs (*callback)(callback_arg, dm_segments, seg, error); 48032516Sgibbs 48132516Sgibbs return (0); 48232516Sgibbs} 48332516Sgibbs 48432516Sgibbs/* 48532516Sgibbs * Release the mapping held by map. 48632516Sgibbs */ 48732516Sgibbsvoid 48832516Sgibbs_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 48932516Sgibbs{ 49032516Sgibbs struct bounce_page *bpage; 49132516Sgibbs 49232516Sgibbs while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { 49332516Sgibbs STAILQ_REMOVE_HEAD(&map->bpages, links); 49432516Sgibbs free_bounce_page(dmat, bpage); 49532516Sgibbs } 49632516Sgibbs} 49732516Sgibbs 49832516Sgibbsvoid 49932516Sgibbs_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 50032516Sgibbs{ 50132516Sgibbs struct bounce_page *bpage; 50232516Sgibbs 50332516Sgibbs if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { 50432516Sgibbs 50532516Sgibbs /* 50632516Sgibbs * Handle data bouncing. We might also 50732516Sgibbs * want to add support for invalidating 50832516Sgibbs * the caches on broken hardware 50932516Sgibbs */ 51032516Sgibbs switch (op) { 51132516Sgibbs case BUS_DMASYNC_PREWRITE: 51232516Sgibbs while (bpage != NULL) { 51332516Sgibbs bcopy((void *)bpage->datavaddr, 51432516Sgibbs (void *)bpage->vaddr, 51532516Sgibbs bpage->datacount); 51632516Sgibbs bpage = STAILQ_NEXT(bpage, links); 51732516Sgibbs } 51832516Sgibbs break; 51932516Sgibbs 52032516Sgibbs case BUS_DMASYNC_POSTREAD: 52132516Sgibbs while (bpage != NULL) { 52232516Sgibbs bcopy((void *)bpage->vaddr, 52332516Sgibbs (void *)bpage->datavaddr, 52432516Sgibbs bpage->datacount); 52532516Sgibbs bpage = STAILQ_NEXT(bpage, links); 52632516Sgibbs } 52732516Sgibbs break; 52832516Sgibbs case BUS_DMASYNC_PREREAD: 52932516Sgibbs case BUS_DMASYNC_POSTWRITE: 53032516Sgibbs /* No-ops */ 53132516Sgibbs break; 53232516Sgibbs } 53332516Sgibbs } 53432516Sgibbs} 53532516Sgibbs 53632516Sgibbsstatic int 53732516Sgibbsalloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages) 53832516Sgibbs{ 53932516Sgibbs int count; 54032516Sgibbs 54132516Sgibbs count = 0; 54232516Sgibbs if (total_bpages == 0) { 54332516Sgibbs STAILQ_INIT(&bounce_page_list); 54432516Sgibbs STAILQ_INIT(&bounce_map_waitinglist); 54532516Sgibbs STAILQ_INIT(&bounce_map_callbacklist); 54632516Sgibbs } 54732516Sgibbs 54832516Sgibbs while (numpages > 0) { 54932516Sgibbs struct bounce_page *bpage; 55032516Sgibbs int s; 55132516Sgibbs 55232516Sgibbs bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF, 55369781Sdwmalone M_NOWAIT | M_ZERO); 55432516Sgibbs 55532516Sgibbs if (bpage == NULL) 55632516Sgibbs break; 55732516Sgibbs bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF, 55832516Sgibbs M_NOWAIT, 0ul, 55932516Sgibbs dmat->lowaddr, 56035767Sgibbs PAGE_SIZE, 56135767Sgibbs 0); 56232516Sgibbs if (bpage->vaddr == NULL) { 56332516Sgibbs free(bpage, M_DEVBUF); 56432516Sgibbs break; 56532516Sgibbs } 56632516Sgibbs bpage->busaddr = pmap_kextract(bpage->vaddr); 56732516Sgibbs s = splhigh(); 56832516Sgibbs STAILQ_INSERT_TAIL(&bounce_page_list, bpage, links); 56932516Sgibbs total_bpages++; 57032516Sgibbs free_bpages++; 57132516Sgibbs splx(s); 57232516Sgibbs count++; 57332516Sgibbs numpages--; 57432516Sgibbs } 57532516Sgibbs return (count); 57632516Sgibbs} 57732516Sgibbs 57832516Sgibbsstatic int 57932516Sgibbsreserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map) 58032516Sgibbs{ 58132516Sgibbs int pages; 58232516Sgibbs 58332516Sgibbs pages = MIN(free_bpages, map->pagesneeded - map->pagesreserved); 58432516Sgibbs free_bpages -= pages; 58532516Sgibbs reserved_bpages += pages; 58632516Sgibbs map->pagesreserved += pages; 58732516Sgibbs pages = map->pagesneeded - map->pagesreserved; 58832516Sgibbs 58932516Sgibbs return (pages); 59032516Sgibbs} 59132516Sgibbs 59232516Sgibbsstatic vm_offset_t 59332516Sgibbsadd_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr, 59432516Sgibbs bus_size_t size) 59532516Sgibbs{ 59632516Sgibbs int s; 59732516Sgibbs struct bounce_page *bpage; 59832516Sgibbs 59932516Sgibbs if (map->pagesneeded == 0) 60032516Sgibbs panic("add_bounce_page: map doesn't need any pages"); 60132516Sgibbs map->pagesneeded--; 60232516Sgibbs 60332516Sgibbs if (map->pagesreserved == 0) 60432516Sgibbs panic("add_bounce_page: map doesn't need any pages"); 60532516Sgibbs map->pagesreserved--; 60632516Sgibbs 60732516Sgibbs s = splhigh(); 60832516Sgibbs bpage = STAILQ_FIRST(&bounce_page_list); 60932516Sgibbs if (bpage == NULL) 61032516Sgibbs panic("add_bounce_page: free page list is empty"); 61132516Sgibbs 61232516Sgibbs STAILQ_REMOVE_HEAD(&bounce_page_list, links); 61332516Sgibbs reserved_bpages--; 61432516Sgibbs active_bpages++; 61532516Sgibbs splx(s); 61632516Sgibbs 61732516Sgibbs bpage->datavaddr = vaddr; 61832516Sgibbs bpage->datacount = size; 61932516Sgibbs STAILQ_INSERT_TAIL(&(map->bpages), bpage, links); 62032516Sgibbs return (bpage->busaddr); 62132516Sgibbs} 62232516Sgibbs 62332516Sgibbsstatic void 62432516Sgibbsfree_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage) 62532516Sgibbs{ 62632516Sgibbs int s; 62732516Sgibbs struct bus_dmamap *map; 62832516Sgibbs 62932516Sgibbs bpage->datavaddr = 0; 63032516Sgibbs bpage->datacount = 0; 63132516Sgibbs 63232516Sgibbs s = splhigh(); 63332516Sgibbs STAILQ_INSERT_HEAD(&bounce_page_list, bpage, links); 63432516Sgibbs free_bpages++; 63532516Sgibbs active_bpages--; 63632516Sgibbs if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) { 63732516Sgibbs if (reserve_bounce_pages(map->dmat, map) == 0) { 63832516Sgibbs STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links); 63932516Sgibbs STAILQ_INSERT_TAIL(&bounce_map_callbacklist, 64032516Sgibbs map, links); 64132516Sgibbs busdma_swi_pending = 1; 64267551Sjhb sched_swi(vm_ih, SWI_NOSWITCH); 64332516Sgibbs } 64432516Sgibbs } 64532516Sgibbs splx(s); 64632516Sgibbs} 64732516Sgibbs 64832516Sgibbsvoid 64932516Sgibbsbusdma_swi() 65032516Sgibbs{ 65132516Sgibbs int s; 65232516Sgibbs struct bus_dmamap *map; 65332516Sgibbs 65432516Sgibbs s = splhigh(); 65532516Sgibbs while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) { 65632516Sgibbs STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links); 65732516Sgibbs splx(s); 65832516Sgibbs bus_dmamap_load(map->dmat, map, map->buf, map->buflen, 65932516Sgibbs map->callback, map->callback_arg, /*flags*/0); 66032516Sgibbs s = splhigh(); 66132516Sgibbs } 66232516Sgibbs splx(s); 66332516Sgibbs} 664