svn commit: r208433 - in projects/altix/sys: amd64/amd64 amd64/include conf kern sys

Marcel Moolenaar marcel at FreeBSD.org
Sun May 23 05:01:19 UTC 2010


Author: marcel
Date: Sun May 23 05:01:18 2010
New Revision: 208433
URL: http://svn.freebsd.org/changeset/base/208433

Log:
  Trivially switch amd64 to the common busdma implementation.
  Eliminate ARM specific kluges in the API definitions and
  remove #ifndef __sparc64__ surrounding the prototypes.

Modified:
  projects/altix/sys/amd64/amd64/busdma_machdep.c
  projects/altix/sys/amd64/include/bus_dma.h
  projects/altix/sys/conf/files
  projects/altix/sys/kern/subr_busdma.c
  projects/altix/sys/sys/bus_dma.h

Modified: projects/altix/sys/amd64/amd64/busdma_machdep.c
==============================================================================
--- projects/altix/sys/amd64/amd64/busdma_machdep.c	Sun May 23 02:55:59 2010	(r208432)
+++ projects/altix/sys/amd64/amd64/busdma_machdep.c	Sun May 23 05:01:18 2010	(r208433)
@@ -26,1180 +26,3 @@
 
 #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 ((uintptr_t)*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");

*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***


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