The branch main has been updated by dougm: URL: https://cgit.FreeBSD.org/src/commit/?id=029abd3b2987ac60e608753cc106e1e78f08c9d7
commit 029abd3b2987ac60e608753cc106e1e78f08c9d7 Author: Doug Moore <[email protected]> AuthorDate: 2021-12-31 04:12:46 +0000 Commit: Doug Moore <[email protected]> CommitDate: 2021-12-31 04:12:46 +0000 Remove discarded mips source. --- sys/mips/mips/busdma_machdep.c | 1545 ---------------------------------------- 1 file changed, 1545 deletions(-) diff --git a/sys/mips/mips/busdma_machdep.c b/sys/mips/mips/busdma_machdep.c deleted file mode 100644 index 348c1d98c328..000000000000 --- a/sys/mips/mips/busdma_machdep.c +++ /dev/null @@ -1,1545 +0,0 @@ -/*- - * SPDX-License-Identifier: BSD-2-Clause-FreeBSD - * - * Copyright (c) 2006 Oleksandr Tymoshenko - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions, and the following disclaimer, - * without modification, immediately at the beginning of the file. - * 2. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR - * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * From i386/busdma_machdep.c,v 1.26 2002/04/19 22:58:09 alfred - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -/* - * MIPS bus dma support routines - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/bus.h> -#include <sys/busdma_bufalloc.h> -#include <sys/interrupt.h> -#include <sys/lock.h> -#include <sys/proc.h> -#include <sys/memdesc.h> -#include <sys/mutex.h> -#include <sys/ktr.h> -#include <sys/kernel.h> -#include <sys/sysctl.h> -#include <sys/uio.h> - -#include <vm/uma.h> -#include <vm/vm.h> -#include <vm/vm_extern.h> -#include <vm/vm_kern.h> -#include <vm/vm_page.h> -#include <vm/vm_phys.h> -#include <vm/vm_map.h> - -#include <machine/atomic.h> -#include <machine/bus.h> -#include <machine/cache.h> -#include <machine/cpufunc.h> -#include <machine/cpuinfo.h> -#include <machine/md_var.h> - -#define MAX_BPAGES 64 -#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3 -#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4 - -/* - * On XBurst cores from Ingenic, cache-line writeback is local - * only, unless accompanied by invalidation. Invalidations force - * dirty line writeout and invalidation requests forwarded to - * other cores if other cores have the cache line dirty. - */ -#if defined(SMP) && defined(CPU_XBURST) -#define BUS_DMA_FORCE_WBINV -#endif - -struct bounce_zone; - -struct bus_dma_tag { - bus_dma_tag_t parent; - bus_size_t alignment; - bus_addr_t boundary; - bus_addr_t lowaddr; - bus_addr_t highaddr; - bus_dma_filter_t *filter; - void *filterarg; - bus_size_t maxsize; - u_int nsegments; - bus_size_t maxsegsz; - int flags; - int ref_count; - int map_count; - bus_dma_lock_t *lockfunc; - void *lockfuncarg; - bus_dma_segment_t *segments; - struct bounce_zone *bounce_zone; -}; - -struct bounce_page { - vm_offset_t vaddr; /* kva of bounce buffer */ - vm_offset_t vaddr_nocache; /* kva of bounce buffer uncached */ - bus_addr_t busaddr; /* Physical address */ - vm_offset_t datavaddr; /* kva of client data */ - bus_addr_t dataaddr; /* client physical address */ - bus_size_t datacount; /* client data count */ - STAILQ_ENTRY(bounce_page) links; -}; - -struct sync_list { - vm_offset_t vaddr; /* kva of bounce buffer */ - bus_addr_t busaddr; /* Physical address */ - bus_size_t datacount; /* client data count */ -}; - -struct bounce_zone { - STAILQ_ENTRY(bounce_zone) links; - STAILQ_HEAD(bp_list, bounce_page) bounce_page_list; - int total_bpages; - int free_bpages; - int reserved_bpages; - int active_bpages; - int total_bounced; - int total_deferred; - int map_count; - bus_size_t alignment; - bus_addr_t lowaddr; - char zoneid[8]; - char lowaddrid[20]; - struct sysctl_ctx_list sysctl_tree; - struct sysctl_oid *sysctl_tree_top; -}; - -static struct mtx bounce_lock; -static int total_bpages; -static int busdma_zonecount; -static STAILQ_HEAD(, bounce_zone) bounce_zone_list; -static void *busdma_ih; - -static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, - "Busdma parameters"); -SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0, - "Total bounce pages"); - -#define DMAMAP_UNCACHEABLE 0x08 -#define DMAMAP_CACHE_ALIGNED 0x10 - -struct bus_dmamap { - struct bp_list bpages; - int pagesneeded; - int pagesreserved; - bus_dma_tag_t dmat; - struct memdesc mem; - int flags; - TAILQ_ENTRY(bus_dmamap) freelist; - STAILQ_ENTRY(bus_dmamap) links; - bus_dmamap_callback_t *callback; - void *callback_arg; - int sync_count; - struct sync_list *slist; -}; - -static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist; -static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist; - -static void init_bounce_pages(void *dummy); -static int alloc_bounce_zone(bus_dma_tag_t dmat); -static int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages); -static int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, - int commit); -static bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, - vm_offset_t vaddr, bus_addr_t addr, - bus_size_t size); -static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage); - -/* Default tag, as most drivers provide no parent tag. */ -bus_dma_tag_t mips_root_dma_tag; - -static uma_zone_t dmamap_zone; /* Cache of struct bus_dmamap items */ - -static busdma_bufalloc_t coherent_allocator; /* Cache of coherent buffers */ -static busdma_bufalloc_t standard_allocator; /* Cache of standard buffers */ - -MALLOC_DEFINE(M_BUSDMA, "busdma", "busdma metadata"); -MALLOC_DEFINE(M_BOUNCE, "bounce", "busdma bounce pages"); - -/* - * This is the ctor function passed to uma_zcreate() for the pool of dma maps. - * It'll need platform-specific changes if this code is copied. - */ -static int -dmamap_ctor(void *mem, int size, void *arg, int flags) -{ - bus_dmamap_t map; - bus_dma_tag_t dmat; - - map = (bus_dmamap_t)mem; - dmat = (bus_dma_tag_t)arg; - - dmat->map_count++; - - bzero(map, sizeof(*map)); - map->dmat = dmat; - STAILQ_INIT(&map->bpages); - - return (0); -} - -/* - * This is the dtor function passed to uma_zcreate() for the pool of dma maps. - * It may need platform-specific changes if this code is copied . - */ -static void -dmamap_dtor(void *mem, int size, void *arg) -{ - bus_dmamap_t map; - - map = (bus_dmamap_t)mem; - - map->dmat->map_count--; -} - -static void -busdma_init(void *dummy) -{ - - /* Create a cache of maps for bus_dmamap_create(). */ - dmamap_zone = uma_zcreate("dma maps", sizeof(struct bus_dmamap), - dmamap_ctor, dmamap_dtor, NULL, NULL, UMA_ALIGN_PTR, 0); - - /* Create a cache of buffers in standard (cacheable) memory. */ - standard_allocator = busdma_bufalloc_create("buffer", - mips_dcache_max_linesize, /* minimum_alignment */ - NULL, /* uma_alloc func */ - NULL, /* uma_free func */ - 0); /* uma_zcreate_flags */ - - /* - * Create a cache of buffers in uncacheable memory, to implement the - * BUS_DMA_COHERENT flag. - */ - coherent_allocator = busdma_bufalloc_create("coherent", - mips_dcache_max_linesize, /* minimum_alignment */ - busdma_bufalloc_alloc_uncacheable, - busdma_bufalloc_free_uncacheable, - 0); /* uma_zcreate_flags */ -} -SYSINIT(busdma, SI_SUB_KMEM, SI_ORDER_FOURTH, busdma_init, NULL); - -/* - * Return true if a match is made. - * - * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'. - * - * If paddr is within the bounds of the dma tag then call the filter callback - * to check for a match, if there is no filter callback then assume a match. - */ -static int -run_filter(bus_dma_tag_t dmat, bus_addr_t paddr) -{ - int retval; - - retval = 0; - - do { - if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr) - || !vm_addr_align_ok(paddr, dmat->alignment)) - && (dmat->filter == NULL - || (*dmat->filter)(dmat->filterarg, paddr) != 0)) - retval = 1; - - dmat = dmat->parent; - } while (retval == 0 && dmat != NULL); - return (retval); -} - -/* - * Check to see if the specified page is in an allowed DMA range. - */ - -static __inline int -_bus_dma_can_bounce(vm_offset_t lowaddr, vm_offset_t highaddr) -{ - int i; - for (i = 0; phys_avail[i] && phys_avail[i + 1]; i += 2) { - if ((lowaddr >= phys_avail[i] && lowaddr <= phys_avail[i + 1]) - || (lowaddr < phys_avail[i] && - highaddr > phys_avail[i])) - return (1); - } - return (0); -} - -/* - * Convenience function for manipulating driver locks from busdma (during - * busdma_swi, for example). - */ -void -busdma_lock_mutex(void *arg, bus_dma_lock_op_t op) -{ - struct mtx *dmtx; - - dmtx = (struct mtx *)arg; - switch (op) { - case BUS_DMA_LOCK: - mtx_lock(dmtx); - break; - case BUS_DMA_UNLOCK: - mtx_unlock(dmtx); - break; - default: - panic("Unknown operation 0x%x for busdma_lock_mutex!", op); - } -} - -/* - * dflt_lock should never get called. It gets put into the dma tag when - * lockfunc == NULL, which is only valid if the maps that are associated - * with the tag are meant to never be defered. - * XXX Should have a way to identify which driver is responsible here. - */ -static void -dflt_lock(void *arg, bus_dma_lock_op_t op) -{ -#ifdef INVARIANTS - panic("driver error: busdma dflt_lock called"); -#else - printf("DRIVER_ERROR: busdma dflt_lock called\n"); -#endif -} - -static __inline bus_dmamap_t -_busdma_alloc_dmamap(bus_dma_tag_t dmat) -{ - struct sync_list *slist; - bus_dmamap_t map; - - slist = malloc(sizeof(*slist) * dmat->nsegments, M_BUSDMA, M_NOWAIT); - if (slist == NULL) - return (NULL); - map = uma_zalloc_arg(dmamap_zone, dmat, M_NOWAIT); - if (map != NULL) - map->slist = slist; - else - free(slist, M_BUSDMA); - return (map); -} - -static __inline void -_busdma_free_dmamap(bus_dmamap_t map) -{ - - free(map->slist, M_BUSDMA); - uma_zfree(dmamap_zone, map); -} - -/* - * Allocate a device specific dma_tag. - */ -#define SEG_NB 1024 - -int -bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, - bus_addr_t boundary, bus_addr_t lowaddr, - bus_addr_t highaddr, bus_dma_filter_t *filter, - void *filterarg, bus_size_t maxsize, int nsegments, - bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, - void *lockfuncarg, bus_dma_tag_t *dmat) -{ - bus_dma_tag_t newtag; - int error = 0; - /* Return a NULL tag on failure */ - *dmat = NULL; - if (!parent) - parent = mips_root_dma_tag; - - newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_BUSDMA, M_NOWAIT); - if (newtag == NULL) { - CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", - __func__, newtag, 0, error); - return (ENOMEM); - } - - newtag->parent = parent; - newtag->alignment = alignment; - newtag->boundary = boundary; - newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1); - newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1); - newtag->filter = filter; - newtag->filterarg = filterarg; - newtag->maxsize = maxsize; - newtag->nsegments = nsegments; - newtag->maxsegsz = maxsegsz; - newtag->flags = flags; - if (cpuinfo.cache_coherent_dma) - newtag->flags |= BUS_DMA_COHERENT; - newtag->ref_count = 1; /* Count ourself */ - newtag->map_count = 0; - if (lockfunc != NULL) { - newtag->lockfunc = lockfunc; - newtag->lockfuncarg = lockfuncarg; - } else { - newtag->lockfunc = dflt_lock; - newtag->lockfuncarg = NULL; - } - newtag->segments = NULL; - - /* - * Take into account any restrictions imposed by our parent tag - */ - if (parent != NULL) { - newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr); - newtag->highaddr = MAX(parent->highaddr, newtag->highaddr); - if (newtag->boundary == 0) - newtag->boundary = parent->boundary; - else if (parent->boundary != 0) - newtag->boundary = - MIN(parent->boundary, newtag->boundary); - if ((newtag->filter != NULL) || - ((parent->flags & BUS_DMA_COULD_BOUNCE) != 0)) - newtag->flags |= BUS_DMA_COULD_BOUNCE; - if (newtag->filter == NULL) { - /* - * Short circuit looking at our parent directly - * since we have encapsulated all of its information - */ - newtag->filter = parent->filter; - newtag->filterarg = parent->filterarg; - newtag->parent = parent->parent; - } - if (newtag->parent != NULL) - atomic_add_int(&parent->ref_count, 1); - } - if (_bus_dma_can_bounce(newtag->lowaddr, newtag->highaddr) - || newtag->alignment > 1) - newtag->flags |= BUS_DMA_COULD_BOUNCE; - - if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) && - (flags & BUS_DMA_ALLOCNOW) != 0) { - struct bounce_zone *bz; - - /* Must bounce */ - - if ((error = alloc_bounce_zone(newtag)) != 0) { - free(newtag, M_BUSDMA); - return (error); - } - bz = newtag->bounce_zone; - - if (ptoa(bz->total_bpages) < maxsize) { - int pages; - - pages = atop(maxsize) - bz->total_bpages; - - /* Add pages to our bounce pool */ - if (alloc_bounce_pages(newtag, pages) < pages) - error = ENOMEM; - } - /* Performed initial allocation */ - newtag->flags |= BUS_DMA_MIN_ALLOC_COMP; - } else - newtag->bounce_zone = NULL; - if (error != 0) - free(newtag, M_BUSDMA); - else - *dmat = newtag; - CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", - __func__, newtag, (newtag != NULL ? newtag->flags : 0), error); - - return (error); -} - -void -bus_dma_template_clone(bus_dma_template_t *t, bus_dma_tag_t dmat) -{ - - if (t == NULL || dmat == NULL) - return; - - t->parent = dmat->parent; - t->alignment = dmat->alignment; - t->boundary = dmat->boundary; - t->lowaddr = dmat->lowaddr; - t->highaddr = dmat->highaddr; - t->maxsize = dmat->maxsize; - t->nsegments = dmat->nsegments; - t->maxsegsize = dmat->maxsegsz; - t->flags = dmat->flags; - t->lockfunc = dmat->lockfunc; - t->lockfuncarg = dmat->lockfuncarg; -} - -int -bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain) -{ - - return (0); -} - -int -bus_dma_tag_destroy(bus_dma_tag_t dmat) -{ -#ifdef KTR - bus_dma_tag_t dmat_copy = dmat; -#endif - - if (dmat != NULL) { - if (dmat->map_count != 0) - return (EBUSY); - - while (dmat != NULL) { - bus_dma_tag_t parent; - - parent = dmat->parent; - atomic_subtract_int(&dmat->ref_count, 1); - if (dmat->ref_count == 0) { - if (dmat->segments != NULL) - free(dmat->segments, M_BUSDMA); - free(dmat, M_BUSDMA); - /* - * Last reference count, so - * release our reference - * count on our parent. - */ - dmat = parent; - } else - dmat = NULL; - } - } - CTR2(KTR_BUSDMA, "%s tag %p", __func__, dmat_copy); - - return (0); -} - -#include <sys/kdb.h> -/* - * Allocate a handle for mapping from kva/uva/physical - * address space into bus device space. - */ -int -bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) -{ - bus_dmamap_t newmap; - int error = 0; - - if (dmat->segments == NULL) { - dmat->segments = (bus_dma_segment_t *)malloc( - sizeof(bus_dma_segment_t) * dmat->nsegments, M_BUSDMA, - M_NOWAIT); - if (dmat->segments == NULL) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", - __func__, dmat, ENOMEM); - return (ENOMEM); - } - } - - newmap = _busdma_alloc_dmamap(dmat); - if (newmap == NULL) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", __func__, dmat, ENOMEM); - return (ENOMEM); - } - *mapp = newmap; - - /* - * Bouncing might be required if the driver asks for an active - * exclusion region, a data alignment that is stricter than 1, and/or - * an active address boundary. - */ - if (dmat->flags & BUS_DMA_COULD_BOUNCE) { - /* Must bounce */ - struct bounce_zone *bz; - int maxpages; - - if (dmat->bounce_zone == NULL) { - if ((error = alloc_bounce_zone(dmat)) != 0) { - _busdma_free_dmamap(newmap); - *mapp = NULL; - return (error); - } - } - bz = dmat->bounce_zone; - - /* Initialize the new map */ - STAILQ_INIT(&((*mapp)->bpages)); - - /* - * Attempt to add pages to our pool on a per-instance - * basis up to a sane limit. - */ - maxpages = MAX_BPAGES; - if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0 - || (bz->map_count > 0 && bz->total_bpages < maxpages)) { - int pages; - - pages = MAX(atop(dmat->maxsize), 1); - pages = MIN(maxpages - bz->total_bpages, pages); - pages = MAX(pages, 1); - if (alloc_bounce_pages(dmat, pages) < pages) - error = ENOMEM; - - if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) { - if (error == 0) - dmat->flags |= BUS_DMA_MIN_ALLOC_COMP; - } else { - error = 0; - } - } - bz->map_count++; - } - - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, error); - - return (0); -} - -/* - * Destroy a handle for mapping from kva/uva/physical - * address space into bus device space. - */ -int -bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) -{ - - if (STAILQ_FIRST(&map->bpages) != NULL || map->sync_count != 0) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", - __func__, dmat, EBUSY); - return (EBUSY); - } - if (dmat->bounce_zone) - dmat->bounce_zone->map_count--; - _busdma_free_dmamap(map); - CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat); - return (0); -} - -/* - * Allocate a piece of memory that can be efficiently mapped into - * bus device space based on the constraints lited in the dma tag. - * A dmamap to for use with dmamap_load is also allocated. - */ -int -bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddrp, int flags, - bus_dmamap_t *mapp) -{ - bus_dmamap_t newmap = NULL; - busdma_bufalloc_t ba; - struct busdma_bufzone *bufzone; - vm_memattr_t memattr; - void *vaddr; - - int mflags; - - if (flags & BUS_DMA_NOWAIT) - mflags = M_NOWAIT; - else - mflags = M_WAITOK; - if (dmat->segments == NULL) { - dmat->segments = (bus_dma_segment_t *)malloc( - sizeof(bus_dma_segment_t) * dmat->nsegments, M_BUSDMA, - mflags); - if (dmat->segments == NULL) { - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, ENOMEM); - return (ENOMEM); - } - } - - newmap = _busdma_alloc_dmamap(dmat); - if (newmap == NULL) { - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, ENOMEM); - return (ENOMEM); - } - - /* - * If all the memory is coherent with DMA then we don't need to - * do anything special for a coherent mapping request. - */ - if (dmat->flags & BUS_DMA_COHERENT) - flags &= ~BUS_DMA_COHERENT; - - if (flags & BUS_DMA_COHERENT) { - memattr = VM_MEMATTR_UNCACHEABLE; - ba = coherent_allocator; - newmap->flags |= DMAMAP_UNCACHEABLE; - } else { - memattr = VM_MEMATTR_DEFAULT; - ba = standard_allocator; - } - /* All buffers we allocate are cache-aligned. */ - newmap->flags |= DMAMAP_CACHE_ALIGNED; - - if (flags & BUS_DMA_ZERO) - mflags |= M_ZERO; - - /* - * Try to find a bufzone in the allocator that holds a cache of buffers - * of the right size for this request. If the buffer is too big to be - * held in the allocator cache, this returns NULL. - */ - bufzone = busdma_bufalloc_findzone(ba, dmat->maxsize); - - /* - * Allocate the buffer from the uma(9) allocator if... - * - It's small enough to be in the allocator (bufzone not NULL). - * - The alignment constraint isn't larger than the allocation size - * (the allocator aligns buffers to their size boundaries). - * - There's no need to handle lowaddr/highaddr exclusion zones. - * else allocate non-contiguous pages if... - * - The page count that could get allocated doesn't exceed - * nsegments also when the maximum segment size is less - * than PAGE_SIZE. - * - The alignment constraint isn't larger than a page boundary. - * - There are no boundary-crossing constraints. - * else allocate a block of contiguous pages because one or more of the - * constraints is something that only the contig allocator can fulfill. - */ - if (bufzone != NULL && dmat->alignment <= bufzone->size && - !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) { - vaddr = uma_zalloc(bufzone->umazone, mflags); - } else if (dmat->nsegments >= - howmany(dmat->maxsize, MIN(dmat->maxsegsz, PAGE_SIZE)) && - dmat->alignment <= PAGE_SIZE && - (dmat->boundary % PAGE_SIZE) == 0) { - vaddr = (void *)kmem_alloc_attr(dmat->maxsize, mflags, 0, - dmat->lowaddr, memattr); - } else { - vaddr = (void *)kmem_alloc_contig(dmat->maxsize, mflags, 0, - dmat->lowaddr, dmat->alignment, dmat->boundary, memattr); - } - if (vaddr == NULL) { - _busdma_free_dmamap(newmap); - newmap = NULL; - } else { - newmap->sync_count = 0; - } - *vaddrp = vaddr; - *mapp = newmap; - - return (vaddr == NULL ? ENOMEM : 0); -} - -/* - * Free a piece of memory and it's allocated dmamap, that was allocated - * via bus_dmamem_alloc. Make the same choice for free/contigfree. - */ -void -bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) -{ - struct busdma_bufzone *bufzone; - busdma_bufalloc_t ba; - - if (map->flags & DMAMAP_UNCACHEABLE) - ba = coherent_allocator; - else - ba = standard_allocator; - - free(map->slist, M_BUSDMA); - uma_zfree(dmamap_zone, map); - - bufzone = busdma_bufalloc_findzone(ba, dmat->maxsize); - - if (bufzone != NULL && dmat->alignment <= bufzone->size && - !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) - uma_zfree(bufzone->umazone, vaddr); - else - kmem_free((vm_offset_t)vaddr, dmat->maxsize); - CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags); -} - -static void -_bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf, - bus_size_t buflen, int flags) -{ - bus_addr_t curaddr; - bus_size_t sgsize; - - if (map->pagesneeded == 0) { - CTR3(KTR_BUSDMA, "lowaddr= %d, boundary= %d, alignment= %d", - dmat->lowaddr, dmat->boundary, dmat->alignment); - CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", - map, map->pagesneeded); - /* - * Count the number of bounce pages - * needed in order to complete this transfer - */ - curaddr = buf; - while (buflen != 0) { - sgsize = MIN(buflen, dmat->maxsegsz); - if (run_filter(dmat, curaddr) != 0) { - sgsize = MIN(sgsize, PAGE_SIZE); - map->pagesneeded++; - } - curaddr += sgsize; - buflen -= sgsize; - } - CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); - } -} - -static void -_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap, - void *buf, bus_size_t buflen, int flags) -{ - vm_offset_t vaddr; - vm_offset_t vendaddr; - bus_addr_t paddr; - - if (map->pagesneeded == 0) { - CTR3(KTR_BUSDMA, "lowaddr= %d, boundary= %d, alignment= %d", - dmat->lowaddr, dmat->boundary, dmat->alignment); - CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", - map, map->pagesneeded); - /* - * Count the number of bounce pages - * needed in order to complete this transfer - */ - vaddr = (vm_offset_t)buf; - vendaddr = (vm_offset_t)buf + buflen; - - while (vaddr < vendaddr) { - bus_size_t sg_len; - - KASSERT(kernel_pmap == pmap, ("pmap is not kernel pmap")); - sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK); - paddr = pmap_kextract(vaddr); - if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && - run_filter(dmat, paddr) != 0) { - sg_len = roundup2(sg_len, dmat->alignment); - map->pagesneeded++; - } - vaddr += sg_len; - } - CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); - } -} - -static int -_bus_dmamap_reserve_pages(bus_dma_tag_t dmat, bus_dmamap_t map,int flags) -{ - - /* Reserve Necessary Bounce Pages */ - mtx_lock(&bounce_lock); - if (flags & BUS_DMA_NOWAIT) { - if (reserve_bounce_pages(dmat, map, 0) != 0) { - mtx_unlock(&bounce_lock); - return (ENOMEM); - } - } else { - if (reserve_bounce_pages(dmat, map, 1) != 0) { - /* Queue us for resources */ - STAILQ_INSERT_TAIL(&bounce_map_waitinglist, - map, links); - mtx_unlock(&bounce_lock); - return (EINPROGRESS); - } - } - mtx_unlock(&bounce_lock); - - return (0); -} - -/* - * Add a single contiguous physical range to the segment list. - */ -static int -_bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr, - bus_size_t sgsize, bus_dma_segment_t *segs, int *segp) -{ - int seg; - - /* - * Make sure we don't cross any boundaries. - */ - if (!vm_addr_bound_ok(curaddr, sgsize, dmat->boundary)) - sgsize = roundup2(curaddr, dmat->boundary) - curaddr; - - /* - * Insert chunk into a segment, coalescing with - * the previous segment if possible. - */ - seg = *segp; - if (seg >= 0 && - curaddr == segs[seg].ds_addr + segs[seg].ds_len && - (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && - vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len, - dmat->boundary)) - segs[seg].ds_len += sgsize; - } else { - if (++seg >= dmat->nsegments) - return (0); - segs[seg].ds_addr = curaddr; - segs[seg].ds_len = sgsize; - } - *segp = seg; - return (sgsize); -} - -/* - * Utility function to load a physical buffer. segp contains - * the starting segment on entrace, and the ending segment on exit. - */ -int -_bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, - vm_paddr_t buf, bus_size_t buflen, int flags, bus_dma_segment_t *segs, - int *segp) -{ - bus_addr_t curaddr; - bus_size_t sgsize; - int error; - - if (segs == NULL) - segs = dmat->segments; - - if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) { - _bus_dmamap_count_phys(dmat, map, buf, buflen, flags); - if (map->pagesneeded != 0) { - error = _bus_dmamap_reserve_pages(dmat, map, flags); - if (error) - return (error); - } - } - - while (buflen > 0) { - curaddr = buf; - sgsize = MIN(buflen, dmat->maxsegsz); - if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && - map->pagesneeded != 0 && run_filter(dmat, curaddr)) { - sgsize = MIN(sgsize, PAGE_SIZE); - curaddr = add_bounce_page(dmat, map, 0, curaddr, - sgsize); - } - sgsize = _bus_dmamap_addseg(dmat, map, curaddr, sgsize, segs, - segp); - if (sgsize == 0) - break; - buf += sgsize; - buflen -= sgsize; - } - - /* - * Did we fit? - */ - if (buflen != 0) { - bus_dmamap_unload(dmat, map); - return (EFBIG); /* XXX better return value here? */ - } - return (0); -} - -int -_bus_dmamap_load_ma(bus_dma_tag_t dmat, bus_dmamap_t map, - struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags, - bus_dma_segment_t *segs, int *segp) -{ - - return (bus_dmamap_load_ma_triv(dmat, map, ma, tlen, ma_offs, flags, - segs, segp)); -} - -/* *** 579 LINES SKIPPED ***
