diff options
Diffstat (limited to 'sys/amd64/amd64/busdma_machdep.c')
| -rw-r--r-- | sys/amd64/amd64/busdma_machdep.c | 1205 |
1 files changed, 0 insertions, 1205 deletions
diff --git a/sys/amd64/amd64/busdma_machdep.c b/sys/amd64/amd64/busdma_machdep.c deleted file mode 100644 index 5a60bc1..0000000 --- a/sys/amd64/amd64/busdma_machdep.c +++ /dev/null @@ -1,1205 +0,0 @@ -/*- - * Copyright (c) 1997, 1998 Justin T. Gibbs. - * 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. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/bus.h> -#include <sys/interrupt.h> -#include <sys/kernel.h> -#include <sys/ktr.h> -#include <sys/lock.h> -#include <sys/proc.h> -#include <sys/mutex.h> -#include <sys/mbuf.h> -#include <sys/uio.h> -#include <sys/sysctl.h> - -#include <vm/vm.h> -#include <vm/vm_page.h> -#include <vm/vm_map.h> - -#include <machine/atomic.h> -#include <machine/bus.h> -#include <machine/md_var.h> -#include <machine/specialreg.h> - -#define MAX_BPAGES 8192 - -struct bounce_zone; - -struct bus_dma_tag { - bus_dma_tag_t parent; - bus_size_t alignment; - bus_size_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 */ - bus_addr_t busaddr; /* Physical address */ - vm_offset_t datavaddr; /* kva of client data */ - bus_size_t datacount; /* client data count */ - STAILQ_ENTRY(bounce_page) links; -}; - -int busdma_swi_pending; - -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; - -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"); - -struct bus_dmamap { - struct bp_list bpages; - int pagesneeded; - int pagesreserved; - bus_dma_tag_t dmat; - void *buf; /* unmapped buffer pointer */ - bus_size_t buflen; /* unmapped buffer length */ - bus_dmamap_callback_t *callback; - void *callback_arg; - STAILQ_ENTRY(bus_dmamap) links; -}; - -static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist; -static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist; -static struct bus_dmamap nobounce_dmamap; - -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_size_t size); -static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage); -static __inline int run_filter(bus_dma_tag_t dmat, bus_addr_t paddr); - -/* - * 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 __inline int -run_filter(bus_dma_tag_t dmat, bus_addr_t paddr) -{ - int retval; - - retval = 0; - - do { - if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr) - || ((paddr & (dmat->alignment - 1)) != 0)) - && (dmat->filter == NULL - || (*dmat->filter)(dmat->filterarg, paddr) != 0)) - retval = 1; - - dmat = dmat->parent; - } while (retval == 0 && dmat != NULL); - return (retval); -} - -/* - * Convenience function for manipulating driver locks from busdma (during - * busdma_swi, for example). Drivers that don't provide their own locks - * should specify &Giant to dmat->lockfuncarg. Drivers that use their own - * non-mutex locking scheme don't have to use this at all. - */ -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) -{ - panic("driver error: busdma dflt_lock called"); -} - -#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3 -#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4 -/* - * Allocate a device specific dma_tag. - */ -int -bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, - bus_size_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; - - /* Basic sanity checking */ - if (boundary != 0 && boundary < maxsegsz) - maxsegsz = boundary; - - if (maxsegsz == 0) { - return (EINVAL); - } - - /* Return a NULL tag on failure */ - *dmat = NULL; - - newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, - M_ZERO | 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_paddr_t)lowaddr) + (PAGE_SIZE - 1); - newtag->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1); - newtag->filter = filter; - newtag->filterarg = filterarg; - newtag->maxsize = maxsize; - newtag->nsegments = nsegments; - newtag->maxsegsz = maxsegsz; - newtag->flags = flags; - 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) { - /* - * 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 (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem) - || 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_DEVBUF); - 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; - } - - if (error != 0) { - free(newtag, M_DEVBUF); - } 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); -} - -int -bus_dma_tag_destroy(bus_dma_tag_t dmat) -{ - bus_dma_tag_t dmat_copy; - int error; - - error = 0; - dmat_copy = dmat; - - if (dmat != NULL) { - - if (dmat->map_count != 0) { - error = EBUSY; - goto out; - } - - 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_DEVBUF); - free(dmat, M_DEVBUF); - /* - * Last reference count, so - * release our reference - * count on our parent. - */ - dmat = parent; - } else - dmat = NULL; - } - } -out: - CTR3(KTR_BUSDMA, "%s tag %p error %d", __func__, dmat_copy, error); - return (error); -} - -/* - * 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) -{ - int error; - - error = 0; - - if (dmat->segments == NULL) { - dmat->segments = (bus_dma_segment_t *)malloc( - sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF, - M_NOWAIT); - if (dmat->segments == NULL) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", - __func__, dmat, ENOMEM); - return (ENOMEM); - } - } - - /* - * 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) - return (error); - } - bz = dmat->bounce_zone; - - *mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF, - M_NOWAIT | M_ZERO); - if (*mapp == NULL) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", - __func__, dmat, ENOMEM); - return (ENOMEM); - } - - /* 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. - */ - if (dmat->alignment > 1) - maxpages = MAX_BPAGES; - else - maxpages = MIN(MAX_BPAGES, Maxmem -atop(dmat->lowaddr)); - 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++; - } else { - *mapp = NULL; - } - if (error == 0) - dmat->map_count++; - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, error); - return (error); -} - -/* - * 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 (map != NULL && map != &nobounce_dmamap) { - if (STAILQ_FIRST(&map->bpages) != NULL) { - CTR3(KTR_BUSDMA, "%s: tag %p error %d", - __func__, dmat, EBUSY); - return (EBUSY); - } - if (dmat->bounce_zone) - dmat->bounce_zone->map_count--; - free(map, M_DEVBUF); - } - dmat->map_count--; - 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** vaddr, int flags, - bus_dmamap_t *mapp) -{ - int mflags; - - if (flags & BUS_DMA_NOWAIT) - mflags = M_NOWAIT; - else - mflags = M_WAITOK; - - /* If we succeed, no mapping/bouncing will be required */ - *mapp = NULL; - - if (dmat->segments == NULL) { - dmat->segments = (bus_dma_segment_t *)malloc( - sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF, - mflags); - if (dmat->segments == NULL) { - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, ENOMEM); - return (ENOMEM); - } - } - if (flags & BUS_DMA_ZERO) - mflags |= M_ZERO; - - /* - * XXX: - * (dmat->alignment < dmat->maxsize) is just a quick hack; the exact - * alignment guarantees of malloc need to be nailed down, and the - * code below should be rewritten to take that into account. - * - * In the meantime, we'll warn the user if malloc gets it wrong. - */ - if ((dmat->maxsize <= PAGE_SIZE) && - (dmat->alignment < dmat->maxsize) && - dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem)) { - *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); - } else { - /* - * XXX Use Contigmalloc until it is merged into this facility - * and handles multi-seg allocations. Nobody is doing - * multi-seg allocations yet though. - * XXX Certain AGP hardware does. - */ - *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, - 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, - dmat->boundary); - } - if (*vaddr == NULL) { - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, ENOMEM); - return (ENOMEM); - } else if (vtophys(*vaddr) & (dmat->alignment - 1)) { - printf("bus_dmamem_alloc failed to align memory properly.\n"); - } - if (flags & BUS_DMA_NOCACHE) - pmap_change_attr((vm_offset_t)*vaddr, dmat->maxsize, - PAT_UNCACHEABLE); - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", - __func__, dmat, dmat->flags, 0); - return (0); -} - -/* - * Free a piece of memory and it's allociated 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) -{ - /* - * dmamem does not need to be bounced, so the map should be - * NULL - */ - if (map != NULL) - panic("bus_dmamem_free: Invalid map freed\n"); - pmap_change_attr((vm_offset_t)vaddr, dmat->maxsize, PAT_WRITE_BACK); - if ((dmat->maxsize <= PAGE_SIZE) && - (dmat->alignment < dmat->maxsize) && - dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem)) - free(vaddr, M_DEVBUF); - else { - contigfree(vaddr, dmat->maxsize, M_DEVBUF); - } - CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags); -} - -/* - * Utility function to load a linear buffer. lastaddrp holds state - * between invocations (for multiple-buffer loads). segp contains - * the starting segment on entrace, and the ending segment on exit. - * first indicates if this is the first invocation of this function. - */ -static __inline int -_bus_dmamap_load_buffer(bus_dma_tag_t dmat, - bus_dmamap_t map, - void *buf, bus_size_t buflen, - pmap_t pmap, - int flags, - bus_addr_t *lastaddrp, - bus_dma_segment_t *segs, - int *segp, - int first) -{ - bus_size_t sgsize; - bus_addr_t curaddr, lastaddr, baddr, bmask; - vm_offset_t vaddr; - bus_addr_t paddr; - int seg; - - if (map == NULL) - map = &nobounce_dmamap; - - if ((map != &nobounce_dmamap && map->pagesneeded == 0) - && ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0)) { - vm_offset_t vendaddr; - - CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, " - "alignment= %d", dmat->lowaddr, ptoa((vm_paddr_t)Maxmem), - dmat->boundary, dmat->alignment); - CTR3(KTR_BUSDMA, "map= %p, nobouncemap= %p, pagesneeded= %d", - map, &nobounce_dmamap, 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; - - sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK); - if (pmap) - paddr = pmap_extract(pmap, vaddr); - else - paddr = pmap_kextract(vaddr); - if (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); - } - - /* Reserve Necessary Bounce Pages */ - if (map->pagesneeded != 0) { - 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 */ - map->dmat = dmat; - map->buf = buf; - map->buflen = buflen; - STAILQ_INSERT_TAIL(&bounce_map_waitinglist, - map, links); - mtx_unlock(&bounce_lock); - return (EINPROGRESS); - } - } - mtx_unlock(&bounce_lock); - } - - vaddr = (vm_offset_t)buf; - lastaddr = *lastaddrp; - bmask = ~(dmat->boundary - 1); - - for (seg = *segp; buflen > 0 ; ) { - bus_size_t max_sgsize; - - /* - * Get the physical address for this segment. - */ - if (pmap) - curaddr = pmap_extract(pmap, vaddr); - else - curaddr = pmap_kextract(vaddr); - - /* - * Compute the segment size, and adjust counts. - */ - max_sgsize = MIN(buflen, dmat->maxsegsz); - sgsize = PAGE_SIZE - ((vm_offset_t)curaddr & PAGE_MASK); - if (map->pagesneeded != 0 && run_filter(dmat, curaddr)) { - sgsize = roundup2(sgsize, dmat->alignment); - sgsize = MIN(sgsize, max_sgsize); - curaddr = add_bounce_page(dmat, map, vaddr, sgsize); - } else { - sgsize = MIN(sgsize, max_sgsize); - } - - /* - * Make sure we don't cross any boundaries. - */ - if (dmat->boundary > 0) { - baddr = (curaddr + dmat->boundary) & bmask; - if (sgsize > (baddr - curaddr)) - sgsize = (baddr - curaddr); - } - - /* - * Insert chunk into a segment, coalescing with - * previous segment if possible. - */ - if (first) { - segs[seg].ds_addr = curaddr; - segs[seg].ds_len = sgsize; - first = 0; - } else { - if (curaddr == lastaddr && - (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && - (dmat->boundary == 0 || - (segs[seg].ds_addr & bmask) == (curaddr & bmask))) - segs[seg].ds_len += sgsize; - else { - if (++seg >= dmat->nsegments) - break; - segs[seg].ds_addr = curaddr; - segs[seg].ds_len = sgsize; - } - } - - lastaddr = curaddr + sgsize; - vaddr += sgsize; - buflen -= sgsize; - } - - *segp = seg; - *lastaddrp = lastaddr; - - /* - * Did we fit? - */ - return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */ -} - -/* - * Map the buffer buf into bus space using the dmamap map. - */ -int -bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, - bus_size_t buflen, bus_dmamap_callback_t *callback, - void *callback_arg, int flags) -{ - bus_addr_t lastaddr = 0; - int error, nsegs = 0; - - if (map != NULL) { - flags |= BUS_DMA_WAITOK; - map->callback = callback; - map->callback_arg = callback_arg; - } - - error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, NULL, flags, - &lastaddr, dmat->segments, &nsegs, 1); - - CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", - __func__, dmat, dmat->flags, error, nsegs + 1); - - if (error == EINPROGRESS) { - return (error); - } - - if (error) - (*callback)(callback_arg, dmat->segments, 0, error); - else - (*callback)(callback_arg, dmat->segments, nsegs + 1, 0); - - /* - * Return ENOMEM to the caller so that it can pass it up the stack. - * This error only happens when NOWAIT is set, so deferal is disabled. - */ - if (error == ENOMEM) - return (error); - - return (0); -} - - -/* - * Like _bus_dmamap_load(), but for mbufs. - */ -int -bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, - struct mbuf *m0, - bus_dmamap_callback2_t *callback, void *callback_arg, - int flags) -{ - int nsegs, error; - - M_ASSERTPKTHDR(m0); - - flags |= BUS_DMA_NOWAIT; - nsegs = 0; - error = 0; - if (m0->m_pkthdr.len <= dmat->maxsize) { - int first = 1; - bus_addr_t lastaddr = 0; - struct mbuf *m; - - for (m = m0; m != NULL && error == 0; m = m->m_next) { - if (m->m_len > 0) { - error = _bus_dmamap_load_buffer(dmat, map, - m->m_data, m->m_len, - NULL, flags, &lastaddr, - dmat->segments, &nsegs, first); - first = 0; - } - } - } else { - error = EINVAL; - } - - if (error) { - /* force "no valid mappings" in callback */ - (*callback)(callback_arg, dmat->segments, 0, 0, error); - } else { - (*callback)(callback_arg, dmat->segments, - nsegs+1, m0->m_pkthdr.len, error); - } - CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", - __func__, dmat, dmat->flags, error, nsegs + 1); - return (error); -} - -int -bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, - struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, - int flags) -{ - int error; - - M_ASSERTPKTHDR(m0); - - flags |= BUS_DMA_NOWAIT; - *nsegs = 0; - error = 0; - if (m0->m_pkthdr.len <= dmat->maxsize) { - int first = 1; - bus_addr_t lastaddr = 0; - struct mbuf *m; - - for (m = m0; m != NULL && error == 0; m = m->m_next) { - if (m->m_len > 0) { - error = _bus_dmamap_load_buffer(dmat, map, - m->m_data, m->m_len, - NULL, flags, &lastaddr, - segs, nsegs, first); - first = 0; - } - } - } else { - error = EINVAL; - } - - /* XXX FIXME: Having to increment nsegs is really annoying */ - ++*nsegs; - CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", - __func__, dmat, dmat->flags, error, *nsegs); - return (error); -} - -/* - * Like _bus_dmamap_load(), but for uios. - */ -int -bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, - struct uio *uio, - bus_dmamap_callback2_t *callback, void *callback_arg, - int flags) -{ - bus_addr_t lastaddr = 0; - int nsegs, error, first, i; - bus_size_t resid; - struct iovec *iov; - pmap_t pmap; - - flags |= BUS_DMA_NOWAIT; - resid = uio->uio_resid; - iov = uio->uio_iov; - - if (uio->uio_segflg == UIO_USERSPACE) { - KASSERT(uio->uio_td != NULL, - ("bus_dmamap_load_uio: USERSPACE but no proc")); - pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); - } else - pmap = NULL; - - nsegs = 0; - error = 0; - first = 1; - for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { - /* - * Now at the first iovec to load. Load each iovec - * until we have exhausted the residual count. - */ - bus_size_t minlen = - resid < iov[i].iov_len ? resid : iov[i].iov_len; - caddr_t addr = (caddr_t) iov[i].iov_base; - - if (minlen > 0) { - error = _bus_dmamap_load_buffer(dmat, map, - addr, minlen, pmap, flags, &lastaddr, - dmat->segments, &nsegs, first); - first = 0; - - resid -= minlen; - } - } - - if (error) { - /* force "no valid mappings" in callback */ - (*callback)(callback_arg, dmat->segments, 0, 0, error); - } else { - (*callback)(callback_arg, dmat->segments, - nsegs+1, uio->uio_resid, error); - } - CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", - __func__, dmat, dmat->flags, error, nsegs + 1); - return (error); -} - -/* - * Release the mapping held by map. - */ -void -_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) -{ - struct bounce_page *bpage; - - while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { - STAILQ_REMOVE_HEAD(&map->bpages, links); - free_bounce_page(dmat, bpage); - } -} - -void -_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) -{ - struct bounce_page *bpage; - - if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { - /* - * Handle data bouncing. We might also - * want to add support for invalidating - * the caches on broken hardware - */ - CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x " - "performing bounce", __func__, op, dmat, dmat->flags); - - if (op & BUS_DMASYNC_PREWRITE) { - while (bpage != NULL) { - bcopy((void *)bpage->datavaddr, - (void *)bpage->vaddr, - bpage->datacount); - bpage = STAILQ_NEXT(bpage, links); - } - dmat->bounce_zone->total_bounced++; - } - - if (op & BUS_DMASYNC_POSTREAD) { - while (bpage != NULL) { - bcopy((void *)bpage->vaddr, - (void *)bpage->datavaddr, - bpage->datacount); - bpage = STAILQ_NEXT(bpage, links); - } - dmat->bounce_zone->total_bounced++; - } - } -} - -static void -init_bounce_pages(void *dummy __unused) -{ - - total_bpages = 0; - STAILQ_INIT(&bounce_zone_list); - STAILQ_INIT(&bounce_map_waitinglist); - STAILQ_INIT(&bounce_map_callbacklist); - mtx_init(&bounce_lock, "bounce pages lock", NULL, MTX_DEF); -} -SYSINIT(bpages, SI_SUB_LOCK, SI_ORDER_ANY, init_bounce_pages, NULL); - -static struct sysctl_ctx_list * -busdma_sysctl_tree(struct bounce_zone *bz) -{ - return (&bz->sysctl_tree); -} - -static struct sysctl_oid * -busdma_sysctl_tree_top(struct bounce_zone *bz) -{ - return (bz->sysctl_tree_top); -} - -static int -alloc_bounce_zone(bus_dma_tag_t dmat) -{ - struct bounce_zone *bz; - - /* Check to see if we already have a suitable zone */ - STAILQ_FOREACH(bz, &bounce_zone_list, links) { - if ((dmat->alignment <= bz->alignment) - && (dmat->lowaddr >= bz->lowaddr)) { - dmat->bounce_zone = bz; - return (0); - } - } - - if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF, - M_NOWAIT | M_ZERO)) == NULL) - return (ENOMEM); - - STAILQ_INIT(&bz->bounce_page_list); - bz->free_bpages = 0; - bz->reserved_bpages = 0; - bz->active_bpages = 0; - bz->lowaddr = dmat->lowaddr; - bz->alignment = MAX(dmat->alignment, PAGE_SIZE); - bz->map_count = 0; - snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount); - busdma_zonecount++; - snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr); - STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links); - dmat->bounce_zone = bz; - - sysctl_ctx_init(&bz->sysctl_tree); - bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree, - SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid, - CTLFLAG_RD, 0, ""); - if (bz->sysctl_tree_top == NULL) { - sysctl_ctx_free(&bz->sysctl_tree); - return (0); /* XXX error code? */ - } - - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0, - "Total bounce pages"); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0, - "Free bounce pages"); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0, - "Reserved bounce pages"); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0, - "Active bounce pages"); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "total_bounced", CTLFLAG_RD, &bz->total_bounced, 0, - "Total bounce requests"); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "total_deferred", CTLFLAG_RD, &bz->total_deferred, 0, - "Total bounce requests that were deferred"); - SYSCTL_ADD_STRING(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, ""); - SYSCTL_ADD_INT(busdma_sysctl_tree(bz), - SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, - "alignment", CTLFLAG_RD, &bz->alignment, 0, ""); - - return (0); -} - -static int -alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages) -{ - struct bounce_zone *bz; - int count; - - bz = dmat->bounce_zone; - count = 0; - while (numpages > 0) { - struct bounce_page *bpage; - - bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF, - M_NOWAIT | M_ZERO); - - if (bpage == NULL) - break; - bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF, - M_NOWAIT, 0ul, - bz->lowaddr, - PAGE_SIZE, - 0); - if (bpage->vaddr == 0) { - free(bpage, M_DEVBUF); - break; - } - bpage->busaddr = pmap_kextract(bpage->vaddr); - mtx_lock(&bounce_lock); - STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links); - total_bpages++; - bz->total_bpages++; - bz->free_bpages++; - mtx_unlock(&bounce_lock); - count++; - numpages--; - } - return (count); -} - -static int -reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit) -{ - struct bounce_zone *bz; - int pages; - - mtx_assert(&bounce_lock, MA_OWNED); - bz = dmat->bounce_zone; - pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved); - if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages)) - return (map->pagesneeded - (map->pagesreserved + pages)); - bz->free_bpages -= pages; - bz->reserved_bpages += pages; - map->pagesreserved += pages; - pages = map->pagesneeded - map->pagesreserved; - - return (pages); -} - -static bus_addr_t -add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr, - bus_size_t size) -{ - struct bounce_zone *bz; - struct bounce_page *bpage; - - KASSERT(dmat->bounce_zone != NULL, ("no bounce zone in dma tag")); - KASSERT(map != NULL && map != &nobounce_dmamap, - ("add_bounce_page: bad map %p", map)); - - bz = dmat->bounce_zone; - if (map->pagesneeded == 0) - panic("add_bounce_page: map doesn't need any pages"); - map->pagesneeded--; - - if (map->pagesreserved == 0) - panic("add_bounce_page: map doesn't need any pages"); - map->pagesreserved--; - - mtx_lock(&bounce_lock); - bpage = STAILQ_FIRST(&bz->bounce_page_list); - if (bpage == NULL) - panic("add_bounce_page: free page list is empty"); - - STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links); - bz->reserved_bpages--; - bz->active_bpages++; - mtx_unlock(&bounce_lock); - - if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) { - /* Page offset needs to be preserved. */ - bpage->vaddr |= vaddr & PAGE_MASK; - bpage->busaddr |= vaddr & PAGE_MASK; - } - bpage->datavaddr = vaddr; - bpage->datacount = size; - STAILQ_INSERT_TAIL(&(map->bpages), bpage, links); - return (bpage->busaddr); -} - -static void -free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage) -{ - struct bus_dmamap *map; - struct bounce_zone *bz; - - bz = dmat->bounce_zone; - bpage->datavaddr = 0; - bpage->datacount = 0; - if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) { - /* - * Reset the bounce page to start at offset 0. Other uses - * of this bounce page may need to store a full page of - * data and/or assume it starts on a page boundary. - */ - bpage->vaddr &= ~PAGE_MASK; - bpage->busaddr &= ~PAGE_MASK; - } - - mtx_lock(&bounce_lock); - STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links); - bz->free_bpages++; - bz->active_bpages--; - if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) { - if (reserve_bounce_pages(map->dmat, map, 1) == 0) { - STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links); - STAILQ_INSERT_TAIL(&bounce_map_callbacklist, - map, links); - busdma_swi_pending = 1; - bz->total_deferred++; - swi_sched(vm_ih, 0); - } - } - mtx_unlock(&bounce_lock); -} - -void -busdma_swi(void) -{ - bus_dma_tag_t dmat; - struct bus_dmamap *map; - - mtx_lock(&bounce_lock); - while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) { - STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links); - mtx_unlock(&bounce_lock); - dmat = map->dmat; - (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_LOCK); - bus_dmamap_load(map->dmat, map, map->buf, map->buflen, - map->callback, map->callback_arg, /*flags*/0); - (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_UNLOCK); - mtx_lock(&bounce_lock); - } - mtx_unlock(&bounce_lock); -} |
