svn commit: r235042 - in projects/altix2/sys: amd64/include
i386/include ia64/ia64 ia64/include sys x86/x86
Marcel Moolenaar
marcel at FreeBSD.org
Fri May 4 23:33:40 UTC 2012
Author: marcel
Date: Fri May 4 23:33:40 2012
New Revision: 235042
URL: http://svn.freebsd.org/changeset/base/235042
Log:
Restore the existing bus_dma implementation. I'll be creating a
new interface on the side so that I don't have to worry about
breaking everything. Also, drivers can be migrated over time with
proper testing if and when the new interface pans out.
The current API uses the bus_dma prefix. The new one will use the
busdma prefix. This also works for source files, with 1 exception:
*/*/busdma_machdep.c. I think I can manage...
Modified:
projects/altix2/sys/amd64/include/bus_dma.h
projects/altix2/sys/i386/include/bus_dma.h
projects/altix2/sys/ia64/ia64/busdma_machdep.c
projects/altix2/sys/ia64/include/bus_dma.h
projects/altix2/sys/sys/bus_dma.h
projects/altix2/sys/x86/x86/busdma_machdep.c
Modified: projects/altix2/sys/amd64/include/bus_dma.h
==============================================================================
--- projects/altix2/sys/amd64/include/bus_dma.h Fri May 4 23:16:29 2012 (r235041)
+++ projects/altix2/sys/amd64/include/bus_dma.h Fri May 4 23:33:40 2012 (r235042)
@@ -31,8 +31,4 @@
#include <sys/bus_dma.h>
-#define BUSDMA_MAX_BPAGES 8192
-
-#define bus_dma_tag_parent(x) x
-
#endif /* _AMD64_BUS_DMA_H_ */
Modified: projects/altix2/sys/i386/include/bus_dma.h
==============================================================================
--- projects/altix2/sys/i386/include/bus_dma.h Fri May 4 23:16:29 2012 (r235041)
+++ projects/altix2/sys/i386/include/bus_dma.h Fri May 4 23:33:40 2012 (r235042)
@@ -31,8 +31,4 @@
#include <sys/bus_dma.h>
-#define BUSDMA_MAX_BPAGES 512
-
-#define bus_dma_tag_parent(x) x
-
#endif /* _I386_BUS_DMA_H_ */
Modified: projects/altix2/sys/ia64/ia64/busdma_machdep.c
==============================================================================
--- projects/altix2/sys/ia64/ia64/busdma_machdep.c Fri May 4 23:16:29 2012 (r235041)
+++ projects/altix2/sys/ia64/ia64/busdma_machdep.c Fri May 4 23:33:40 2012 (r235042)
@@ -26,3 +26,959 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/bus.h>
+#include <sys/interrupt.h>
+#include <sys/proc.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>
+
+#define MAX_BPAGES 1024
+
+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_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;
+};
+
+u_int busdma_swi_pending;
+
+static struct mtx bounce_lock;
+static STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
+static int free_bpages;
+static int reserved_bpages;
+static int active_bpages;
+static int total_bpages;
+static int total_bounced;
+static int total_deferred;
+
+static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters");
+SYSCTL_INT(_hw_busdma, OID_AUTO, free_bpages, CTLFLAG_RD, &free_bpages, 0,
+ "Free bounce pages");
+SYSCTL_INT(_hw_busdma, OID_AUTO, reserved_bpages, CTLFLAG_RD, &reserved_bpages,
+ 0, "Reserved bounce pages");
+SYSCTL_INT(_hw_busdma, OID_AUTO, active_bpages, CTLFLAG_RD, &active_bpages, 0,
+ "Active bounce pages");
+SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0,
+ "Total bounce pages");
+SYSCTL_INT(_hw_busdma, OID_AUTO, total_bounced, CTLFLAG_RD, &total_bounced, 0,
+ "Total bounce requests");
+SYSCTL_INT(_hw_busdma, OID_AUTO, total_deferred, CTLFLAG_RD, &total_deferred,
+ 0, "Total bounce requests that were deferred");
+
+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_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,
+ bus_size_t len);
+
+/*
+ * 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, bus_size_t len)
+{
+ bus_addr_t bndy;
+ int retval;
+
+ retval = 0;
+ bndy = dmat->boundary;
+ do {
+ if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr) ||
+ (paddr & (dmat->alignment - 1)) != 0 ||
+ (paddr & bndy) != ((paddr + len) & bndy)) &&
+ (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_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_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;
+
+ /* Basic sanity checking */
+ if (boundary != 0 && boundary < maxsegsz)
+ maxsegsz = boundary;
+
+ /* Return a NULL tag on failure */
+ *dmat = NULL;
+
+ newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT);
+ if (newtag == NULL)
+ return (ENOMEM);
+
+ newtag->parent = parent;
+ newtag->alignment = alignment;
+ newtag->boundary = boundary;
+ newtag->lowaddr = trunc_page(lowaddr) + (PAGE_SIZE - 1);
+ newtag->highaddr = trunc_page(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(Maxmem) && (flags & BUS_DMA_ALLOCNOW) != 0) {
+ /* Must bounce */
+
+ if (ptoa(total_bpages) < maxsize) {
+ int pages;
+
+ pages = atop(maxsize) - 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;
+ }
+ return (error);
+}
+
+int
+bus_dma_tag_destroy(bus_dma_tag_t dmat)
+{
+ 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_DEVBUF);
+ free(dmat, M_DEVBUF);
+ /*
+ * Last reference count, so
+ * release our reference
+ * count on our parent.
+ */
+ dmat = parent;
+ } else
+ dmat = NULL;
+ }
+ }
+ return (0);
+}
+
+/*
+ * 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)
+ 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->lowaddr < ptoa(Maxmem)) {
+ /* Must bounce */
+ int maxpages;
+
+ *mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
+ M_NOWAIT | M_ZERO);
+ if (*mapp == NULL)
+ 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.
+ */
+ maxpages = MIN(MAX_BPAGES, Maxmem - atop(dmat->lowaddr));
+ if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
+ || (dmat->map_count > 0 && total_bpages < maxpages)) {
+ int pages;
+
+ pages = MAX(atop(dmat->maxsize), 1);
+ pages = MIN(maxpages - total_bpages, pages);
+ 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;
+ }
+ }
+ } else {
+ *mapp = NULL;
+ }
+ if (error == 0)
+ dmat->map_count++;
+ 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)
+ return (EBUSY);
+ free(map, M_DEVBUF);
+ }
+ dmat->map_count--;
+ 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)
+ 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(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)
+ return (ENOMEM);
+ else if (vtophys(*vaddr) & (dmat->alignment - 1))
+ printf("bus_dmamem_alloc failed to align memory properly.\n");
+ 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");
+ if ((dmat->maxsize <= PAGE_SIZE) &&
+ (dmat->alignment < dmat->maxsize) &&
+ dmat->lowaddr >= ptoa(Maxmem))
+ free(vaddr, M_DEVBUF);
+ else {
+ contigfree(vaddr, dmat->maxsize, M_DEVBUF);
+ }
+}
+
+/*
+ * 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 int
+_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
+ bus_size_t buflen, struct thread *td, 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;
+ pmap_t pmap;
+
+ if (map == NULL)
+ map = &nobounce_dmamap;
+
+ if (td != NULL)
+ pmap = vmspace_pmap(td->td_proc->p_vmspace);
+ else
+ pmap = NULL;
+
+ if ((dmat->lowaddr < ptoa(Maxmem) || dmat->boundary > 0 ||
+ dmat->alignment > 1) && map != &nobounce_dmamap &&
+ map->pagesneeded == 0) {
+ vm_offset_t vendaddr;
+
+ /*
+ * Count the number of bounce pages
+ * needed in order to complete this transfer
+ */
+ vaddr = trunc_page((vm_offset_t)buf);
+ vendaddr = (vm_offset_t)buf + buflen;
+
+ while (vaddr < vendaddr) {
+ if (pmap != NULL)
+ paddr = pmap_extract(pmap, vaddr);
+ else
+ paddr = pmap_kextract(vaddr);
+ if (run_filter(dmat, paddr, 0) != 0)
+ map->pagesneeded++;
+ vaddr += PAGE_SIZE;
+ }
+ }
+
+ vaddr = (vm_offset_t)buf;
+
+ /* 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);
+ }
+
+ lastaddr = *lastaddrp;
+ bmask = ~(dmat->boundary - 1);
+
+ for (seg = *segp; buflen > 0 ; ) {
+ /*
+ * 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.
+ */
+ sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK);
+ if (sgsize > dmat->maxsegsz)
+ sgsize = dmat->maxsegsz;
+ if (buflen < sgsize)
+ sgsize = buflen;
+
+ /*
+ * Make sure we don't cross any boundaries.
+ */
+ if (dmat->boundary > 0) {
+ baddr = (curaddr + dmat->boundary) & bmask;
+ if (sgsize > (baddr - curaddr))
+ sgsize = (baddr - curaddr);
+ }
+
+ if (map->pagesneeded != 0 && run_filter(dmat, curaddr, sgsize))
+ curaddr = add_bounce_page(dmat, map, vaddr, sgsize);
+
+ /*
+ * 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);
+
+ if (error == EINPROGRESS)
+ return (error);
+
+ if (error)
+ (*callback)(callback_arg, dmat->segments, 0, error);
+ else
+ (*callback)(callback_arg, dmat->segments, nsegs + 1, 0);
+
+ 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);
+ }
+ 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;
+ }
+ }
+ ++*nsegs;
+ } else {
+ error = EINVAL;
+ }
+
+ 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;
+ int nsegs, error, first, i;
+ bus_size_t resid;
+ struct iovec *iov;
+ struct thread *td = NULL;
+
+ flags |= BUS_DMA_NOWAIT;
+ resid = uio->uio_resid;
+ iov = uio->uio_iov;
+
+ if (uio->uio_segflg == UIO_USERSPACE) {
+ td = uio->uio_td;
+ KASSERT(td != NULL,
+ ("bus_dmamap_load_uio: USERSPACE but no proc"));
+ }
+
+ 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, td, 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);
+ }
+ 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
+ */
+
+ if (op & BUS_DMASYNC_PREWRITE) {
+ while (bpage != NULL) {
+ bcopy((void *)bpage->datavaddr,
+ (void *)bpage->vaddr, bpage->datacount);
+ bpage = STAILQ_NEXT(bpage, links);
+ }
+ total_bounced++;
+ }
+
+ if (op & BUS_DMASYNC_POSTREAD) {
+ while (bpage != NULL) {
+ bcopy((void *)bpage->vaddr,
+ (void *)bpage->datavaddr, bpage->datacount);
+ bpage = STAILQ_NEXT(bpage, links);
+ }
+ total_bounced++;
+ }
+ }
+}
+
+static void
+init_bounce_pages(void *dummy __unused)
+{
+
+ free_bpages = 0;
+ reserved_bpages = 0;
+ active_bpages = 0;
+ total_bpages = 0;
+ STAILQ_INIT(&bounce_page_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 int
+alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
+{
+ int count;
+
+ 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, dmat->lowaddr, PAGE_SIZE, dmat->boundary);
+ if (bpage->vaddr == 0) {
+ free(bpage, M_DEVBUF);
+ break;
+ }
+ bpage->busaddr = pmap_kextract(bpage->vaddr);
+ mtx_lock(&bounce_lock);
+ STAILQ_INSERT_TAIL(&bounce_page_list, bpage, links);
+ total_bpages++;
+ 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)
+{
+ int pages;
+
+ mtx_assert(&bounce_lock, MA_OWNED);
+ pages = MIN(free_bpages, map->pagesneeded - map->pagesreserved);
+ if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages))
+ return (map->pagesneeded - (map->pagesreserved + pages));
+ free_bpages -= pages;
+ 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_page *bpage;
+
+ KASSERT(map != NULL && map != &nobounce_dmamap,
+ ("add_bounce_page: bad map %p", map));
+
+ 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(&bounce_page_list);
+ if (bpage == NULL)
+ panic("add_bounce_page: free page list is empty");
+
+ STAILQ_REMOVE_HEAD(&bounce_page_list, links);
+ reserved_bpages--;
+ 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;
+
+ 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(&bounce_page_list, bpage, links);
+ free_bpages++;
+ 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;
+ 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);
+}
Modified: projects/altix2/sys/ia64/include/bus_dma.h
==============================================================================
--- projects/altix2/sys/ia64/include/bus_dma.h Fri May 4 23:16:29 2012 (r235041)
+++ projects/altix2/sys/ia64/include/bus_dma.h Fri May 4 23:33:40 2012 (r235042)
@@ -30,8 +30,4 @@
#include <sys/bus_dma.h>
-#define BUSDMA_MAX_BPAGES 1024
-
-#define bus_dma_tag_parent(x) x
-
#endif /* _IA64_BUS_DMA_H_ */
Modified: projects/altix2/sys/sys/bus_dma.h
==============================================================================
--- projects/altix2/sys/sys/bus_dma.h Fri May 4 23:16:29 2012 (r235041)
+++ projects/altix2/sys/sys/bus_dma.h Fri May 4 23:33:40 2012 (r235042)
@@ -191,6 +191,13 @@ typedef void bus_dmamap_callback_t(void
typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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