Author: kib
Date: Tue Dec 17 13:39:50 2013
New Revision: 259511
URL: http://svnweb.freebsd.org/changeset/base/259511
Log:
MFC r257230:
Add a virtual table for the busdma methods on x86, to allow different
busdma implementations to coexist.
Added:
stable/10/sys/x86/include/busdma_impl.h
- copied unchanged from r257230, head/sys/x86/include/busdma_impl.h
stable/10/sys/x86/x86/busdma_bounce.c
- copied unchanged from r257230, head/sys/x86/x86/busdma_bounce.c
Modified:
stable/10/sys/conf/files.amd64
stable/10/sys/conf/files.i386
stable/10/sys/conf/files.pc98
stable/10/sys/x86/x86/busdma_machdep.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/conf/files.amd64
==============================================================================
--- stable/10/sys/conf/files.amd64 Tue Dec 17 13:38:21 2013
(r259510)
+++ stable/10/sys/conf/files.amd64 Tue Dec 17 13:39:50 2013
(r259511)
@@ -541,6 +541,7 @@ x86/isa/nmi.c standard
x86/isa/orm.c optional isa
x86/pci/pci_bus.c optional pci
x86/pci/qpi.c optional pci
+x86/x86/busdma_bounce.c standard
x86/x86/busdma_machdep.c standard
x86/x86/dump_machdep.c standard
x86/x86/fdt_machdep.c optional fdt
Modified: stable/10/sys/conf/files.i386
==============================================================================
--- stable/10/sys/conf/files.i386 Tue Dec 17 13:38:21 2013
(r259510)
+++ stable/10/sys/conf/files.i386 Tue Dec 17 13:39:50 2013
(r259511)
@@ -576,6 +576,7 @@ x86/isa/nmi.c standard
x86/isa/orm.c optional isa
x86/pci/pci_bus.c optional pci
x86/pci/qpi.c optional pci
+x86/x86/busdma_bounce.c standard
x86/x86/busdma_machdep.c standard
x86/x86/dump_machdep.c standard
x86/x86/fdt_machdep.c optional fdt
Modified: stable/10/sys/conf/files.pc98
==============================================================================
--- stable/10/sys/conf/files.pc98 Tue Dec 17 13:38:21 2013
(r259510)
+++ stable/10/sys/conf/files.pc98 Tue Dec 17 13:39:50 2013
(r259511)
@@ -247,6 +247,7 @@ x86/isa/atpic.c optional atpic
x86/isa/clock.c standard
x86/isa/isa.c optional isa
x86/pci/pci_bus.c optional pci
+x86/x86/busdma_bounce.c standard
x86/x86/busdma_machdep.c standard
x86/x86/dump_machdep.c standard
x86/x86/intr_machdep.c standard
Copied: stable/10/sys/x86/include/busdma_impl.h (from r257230,
head/sys/x86/include/busdma_impl.h)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/10/sys/x86/include/busdma_impl.h Tue Dec 17 13:39:50 2013
(r259511, copy of r257230, head/sys/x86/include/busdma_impl.h)
@@ -0,0 +1,97 @@
+/*-
+ * Copyright (c) 2013 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Konstantin Belousov <k...@freebsd.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __X86_BUSDMA_IMPL_H
+#define __X86_BUSDMA_IMPL_H
+
+struct bus_dma_tag_common {
+ struct bus_dma_impl *impl;
+ struct bus_dma_tag_common *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;
+ bus_dma_lock_t *lockfunc;
+ void *lockfuncarg;
+ int ref_count;
+};
+
+struct bus_dma_impl {
+ int (*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);
+ int (*tag_destroy)(bus_dma_tag_t dmat);
+ int (*map_create)(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
+ int (*map_destroy)(bus_dma_tag_t dmat, bus_dmamap_t map);
+ int (*mem_alloc)(bus_dma_tag_t dmat, void** vaddr, int flags,
+ bus_dmamap_t *mapp);
+ void (*mem_free)(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
+ int (*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);
+ int (*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);
+ int (*load_buffer)(bus_dma_tag_t dmat, bus_dmamap_t map,
+ void *buf, bus_size_t buflen, pmap_t pmap, int flags,
+ bus_dma_segment_t *segs, int *segp);
+ void (*map_waitok)(bus_dma_tag_t dmat, bus_dmamap_t map,
+ struct memdesc *mem, bus_dmamap_callback_t *callback,
+ void *callback_arg);
+ bus_dma_segment_t *(*map_complete)(bus_dma_tag_t dmat, bus_dmamap_t map,
+ bus_dma_segment_t *segs, int nsegs, int error);
+ void (*map_unload)(bus_dma_tag_t dmat, bus_dmamap_t map);
+ void (*map_sync)(bus_dma_tag_t dmat, bus_dmamap_t map,
+ bus_dmasync_op_t op);
+};
+
+void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op);
+void bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op);
+int bus_dma_run_filter(struct bus_dma_tag_common *dmat, bus_addr_t paddr);
+int common_bus_dma_tag_create(struct bus_dma_tag_common *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, size_t sz, void **dmat);
+
+extern struct bus_dma_impl bus_dma_bounce_impl;
+
+#endif
Copied: stable/10/sys/x86/x86/busdma_bounce.c (from r257230,
head/sys/x86/x86/busdma_bounce.c)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/10/sys/x86/x86/busdma_bounce.c Tue Dec 17 13:39:50 2013
(r259511, copy of r257230, head/sys/x86/x86/busdma_bounce.c)
@@ -0,0 +1,1080 @@
+/*-
+ * 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/memdesc.h>
+#include <sys/mutex.h>
+#include <sys/sysctl.h>
+#include <sys/uio.h>
+
+#include <vm/vm.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_kern.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>
+#include <x86/include/busdma_impl.h>
+
+#ifdef __i386__
+#define MAX_BPAGES 512
+#else
+#define MAX_BPAGES 8192
+#endif
+#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
+#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
+
+struct bounce_zone;
+
+struct bus_dma_tag {
+ struct bus_dma_tag_common common;
+ int map_count;
+ 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_addr_t dataaddr; /* client physical address */
+ 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;
+
+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");
+
+struct bus_dmamap {
+ struct bp_list bpages;
+ int pagesneeded;
+ int pagesreserved;
+ bus_dma_tag_t dmat;
+ struct memdesc mem;
+ 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, contig_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_addr_t addr,
+ bus_size_t size);
+static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage);
+int run_filter(bus_dma_tag_t dmat, bus_addr_t paddr);
+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);
+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);
+static int _bus_dmamap_reserve_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
+ int flags);
+
+#ifdef XEN
+#undef pmap_kextract
+#define pmap_kextract pmap_kextract_ma
+#endif
+
+/*
+ * Allocate a device specific dma_tag.
+ */
+static int
+bounce_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;
+
+ *dmat = NULL;
+ error = common_bus_dma_tag_create(parent != NULL ? &parent->common :
+ NULL, alignment, boundary, lowaddr, highaddr, filter, filterarg,
+ maxsize, nsegments, maxsegsz, flags, lockfunc, lockfuncarg,
+ sizeof (struct bus_dma_tag), (void **)&newtag);
+ if (error != 0)
+ return (error);
+
+ newtag->common.impl = &bus_dma_bounce_impl;
+ newtag->map_count = 0;
+ newtag->segments = NULL;
+
+ if (parent != NULL && ((newtag->common.filter != NULL) ||
+ ((parent->common.flags & BUS_DMA_COULD_BOUNCE) != 0)))
+ newtag->common.flags |= BUS_DMA_COULD_BOUNCE;
+
+ if (newtag->common.lowaddr < ptoa((vm_paddr_t)Maxmem) ||
+ newtag->common.alignment > 1)
+ newtag->common.flags |= BUS_DMA_COULD_BOUNCE;
+
+ if (((newtag->common.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->common.flags |= BUS_DMA_MIN_ALLOC_COMP;
+ } else
+ error = 0;
+
+ 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->common.flags : 0),
+ error);
+ return (error);
+}
+
+static int
+bounce_bus_dma_tag_destroy(bus_dma_tag_t dmat)
+{
+ bus_dma_tag_t dmat_copy, parent;
+ int error;
+
+ error = 0;
+ dmat_copy = dmat;
+
+ if (dmat != NULL) {
+ if (dmat->map_count != 0) {
+ error = EBUSY;
+ goto out;
+ }
+ while (dmat != NULL) {
+ parent = (bus_dma_tag_t)dmat->common.parent;
+ atomic_subtract_int(&dmat->common.ref_count, 1);
+ if (dmat->common.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.
+ */
+static int
+bounce_bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
+{
+ struct bounce_zone *bz;
+ int error, maxpages, pages;
+
+ error = 0;
+
+ if (dmat->segments == NULL) {
+ dmat->segments = (bus_dma_segment_t *)malloc(
+ sizeof(bus_dma_segment_t) * dmat->common.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->common.flags & BUS_DMA_COULD_BOUNCE) {
+ /* Must bounce */
+ 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->common.alignment > 1)
+ maxpages = MAX_BPAGES;
+ else
+ maxpages = MIN(MAX_BPAGES, Maxmem -
+ atop(dmat->common.lowaddr));
+ if ((dmat->common.flags & BUS_DMA_MIN_ALLOC_COMP) == 0 ||
+ (bz->map_count > 0 && bz->total_bpages < maxpages)) {
+ pages = MAX(atop(dmat->common.maxsize), 1);
+ pages = MIN(maxpages - bz->total_bpages, pages);
+ pages = MAX(pages, 1);
+ if (alloc_bounce_pages(dmat, pages) < pages)
+ error = ENOMEM;
+ if ((dmat->common.flags & BUS_DMA_MIN_ALLOC_COMP)
+ == 0) {
+ if (error == 0) {
+ dmat->common.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->common.flags, error);
+ return (error);
+}
+
+/*
+ * Destroy a handle for mapping from kva/uva/physical
+ * address space into bus device space.
+ */
+static int
+bounce_bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+
+ if (map != NULL && map != &nobounce_dmamap && map != &contig_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.
+ */
+static int
+bounce_bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
+ bus_dmamap_t *mapp)
+{
+ vm_memattr_t attr;
+ 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->common.nsegments,
+ M_DEVBUF, mflags);
+ if (dmat->segments == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->common.flags, ENOMEM);
+ return (ENOMEM);
+ }
+ }
+ if (flags & BUS_DMA_ZERO)
+ mflags |= M_ZERO;
+ if (flags & BUS_DMA_NOCACHE)
+ attr = VM_MEMATTR_UNCACHEABLE;
+ else
+ attr = VM_MEMATTR_DEFAULT;
+
+ /*
+ * 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->common.maxsize <= PAGE_SIZE) &&
+ (dmat->common.alignment < dmat->common.maxsize) &&
+ dmat->common.lowaddr >= ptoa((vm_paddr_t)Maxmem) &&
+ attr == VM_MEMATTR_DEFAULT) {
+ *vaddr = malloc(dmat->common.maxsize, M_DEVBUF, mflags);
+ } else if (dmat->common.nsegments >= btoc(dmat->common.maxsize) &&
+ dmat->common.alignment <= PAGE_SIZE &&
+ (dmat->common.boundary == 0 ||
+ dmat->common.boundary >= dmat->common.lowaddr)) {
+ /* Page-based multi-segment allocations allowed */
+ *vaddr = (void *)kmem_alloc_attr(kernel_arena,
+ dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr,
+ attr);
+ *mapp = &contig_dmamap;
+ } else {
+ *vaddr = (void *)kmem_alloc_contig(kernel_arena,
+ dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr,
+ dmat->common.alignment != 0 ? dmat->common.alignment : 1ul,
+ dmat->common.boundary, attr);
+ *mapp = &contig_dmamap;
+ }
+ if (*vaddr == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->common.flags, ENOMEM);
+ return (ENOMEM);
+ } else if (vtophys(*vaddr) & (dmat->common.alignment - 1)) {
+ printf("bus_dmamem_alloc failed to align memory properly.\n");
+ }
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->common.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.
+ */
+static void
+bounce_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 malloc() was used and contig_dmamap if
+ * kmem_alloc_contig() was used.
+ */
+ if (!(map == NULL || map == &contig_dmamap))
+ panic("bus_dmamem_free: Invalid map freed\n");
+ if (map == NULL)
+ free(vaddr, M_DEVBUF);
+ else
+ kmem_free(kernel_arena, (vm_offset_t)vaddr,
+ dmat->common.maxsize);
+ CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat,
+ dmat->common.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 != &nobounce_dmamap && map->pagesneeded == 0)) {
+ /*
+ * Count the number of bounce pages
+ * needed in order to complete this transfer
+ */
+ curaddr = buf;
+ while (buflen != 0) {
+ sgsize = MIN(buflen, dmat->common.maxsegsz);
+ if (bus_dma_run_filter(&dmat->common, curaddr)) {
+ 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;
+ bus_size_t sg_len;
+
+ if ((map != &nobounce_dmamap && map->pagesneeded == 0)) {
+ CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, "
+ "alignment= %d", dmat->common.lowaddr,
+ ptoa((vm_paddr_t)Maxmem),
+ dmat->common.boundary, dmat->common.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) {
+ sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK);
+ if (pmap == kernel_pmap)
+ paddr = pmap_kextract(vaddr);
+ else
+ paddr = pmap_extract(pmap, vaddr);
+ if (bus_dma_run_filter(&dmat->common, paddr) != 0) {
+ sg_len = roundup2(sg_len,
+ dmat->common.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)
+{
+ bus_addr_t baddr, bmask;
+ int seg;
+
+ /*
+ * Make sure we don't cross any boundaries.
+ */
+ bmask = ~(dmat->common.boundary - 1);
+ if (dmat->common.boundary > 0) {
+ baddr = (curaddr + dmat->common.boundary) & bmask;
+ if (sgsize > (baddr - curaddr))
+ sgsize = (baddr - curaddr);
+ }
+
+ /*
+ * Insert chunk into a segment, coalescing with
+ * previous segment if possible.
+ */
+ seg = *segp;
+ if (seg == -1) {
+ seg = 0;
+ segs[seg].ds_addr = curaddr;
+ segs[seg].ds_len = sgsize;
+ } else {
+ if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
+ (segs[seg].ds_len + sgsize) <= dmat->common.maxsegsz &&
+ (dmat->common.boundary == 0 ||
+ (segs[seg].ds_addr & bmask) == (curaddr & bmask)))
+ segs[seg].ds_len += sgsize;
+ else {
+ if (++seg >= dmat->common.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.
+ */
+static int
+bounce_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_size_t sgsize;
+ bus_addr_t curaddr;
+ int error;
+
+ if (map == NULL || map == &contig_dmamap)
+ map = &nobounce_dmamap;
+
+ if (segs == NULL)
+ segs = dmat->segments;
+
+ if ((dmat->common.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->common.maxsegsz);
+ if (((dmat->common.flags & BUS_DMA_COULD_BOUNCE) != 0) &&
+ map->pagesneeded != 0 &&
+ bus_dma_run_filter(&dmat->common, 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?
+ */
+ return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
+}
+
+/*
+ * Utility function to load a linear buffer. segp contains
+ * the starting segment on entrace, and the ending segment on exit.
+ */
+static int
+bounce_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_dma_segment_t *segs,
+ int *segp)
+{
+ bus_size_t sgsize, max_sgsize;
+ bus_addr_t curaddr;
+ vm_offset_t vaddr;
+ int error;
+
+ if (map == NULL || map == &contig_dmamap)
+ map = &nobounce_dmamap;
+
+ if (segs == NULL)
+ segs = dmat->segments;
+
+ if ((dmat->common.flags & BUS_DMA_COULD_BOUNCE) != 0) {
+ _bus_dmamap_count_pages(dmat, map, pmap, buf, buflen, flags);
+ if (map->pagesneeded != 0) {
+ error = _bus_dmamap_reserve_pages(dmat, map, flags);
+ if (error)
+ return (error);
+ }
+ }
+
+ vaddr = (vm_offset_t)buf;
+ while (buflen > 0) {
+ /*
+ * Get the physical address for this segment.
+ */
+ if (pmap == kernel_pmap)
+ curaddr = pmap_kextract(vaddr);
+ else
+ curaddr = pmap_extract(pmap, vaddr);
+
+ /*
+ * Compute the segment size, and adjust counts.
+ */
+ max_sgsize = MIN(buflen, dmat->common.maxsegsz);
+ sgsize = PAGE_SIZE - ((vm_offset_t)curaddr & PAGE_MASK);
+ if (((dmat->common.flags & BUS_DMA_COULD_BOUNCE) != 0) &&
+ map->pagesneeded != 0 &&
+ bus_dma_run_filter(&dmat->common, curaddr)) {
+ sgsize = roundup2(sgsize, dmat->common.alignment);
+ sgsize = MIN(sgsize, max_sgsize);
+ curaddr = add_bounce_page(dmat, map, vaddr, curaddr,
+ sgsize);
+ } else {
+ sgsize = MIN(sgsize, max_sgsize);
+ }
+ sgsize = _bus_dmamap_addseg(dmat, map, curaddr, sgsize, segs,
+ segp);
+ if (sgsize == 0)
+ break;
+ vaddr += sgsize;
+ buflen -= sgsize;
+ }
+
+ /*
+ * Did we fit?
+ */
+ return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
+}
+
+static void
+bounce_bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
+ struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
+{
+
+ if (map == NULL)
+ return;
+ map->mem = *mem;
+ map->dmat = dmat;
+ map->callback = callback;
+ map->callback_arg = callback_arg;
+}
+
+static bus_dma_segment_t *
+bounce_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
+ bus_dma_segment_t *segs, int nsegs, int error)
+{
+
+ if (segs == NULL)
+ segs = dmat->segments;
+ return (segs);
+}
+
+/*
+ * Release the mapping held by map.
+ */
+static void
+bounce_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);
+ }
+}
+
+static void
+bounce_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__, dmat,
+ dmat->common.flags, op);
+
+ if ((op & BUS_DMASYNC_PREWRITE) != 0) {
+ while (bpage != NULL) {
+ if (bpage->datavaddr != 0) {
+ bcopy((void *)bpage->datavaddr,
+ (void *)bpage->vaddr,
+ bpage->datacount);
+ } else {
+ physcopyout(bpage->dataaddr,
+ (void *)bpage->vaddr,
+ bpage->datacount);
+ }
+ bpage = STAILQ_NEXT(bpage, links);
+ }
+ dmat->bounce_zone->total_bounced++;
+ }
+
+ if ((op & BUS_DMASYNC_POSTREAD) != 0) {
+ while (bpage != NULL) {
+ if (bpage->datavaddr != 0) {
+ bcopy((void *)bpage->vaddr,
+ (void *)bpage->datavaddr,
+ bpage->datacount);
+ } else {
+ physcopyin((void *)bpage->vaddr,
+ bpage->dataaddr,
+ 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);
+}
+
+#if defined(__amd64__) || defined(PAE)
+#define SYSCTL_ADD_BUS_SIZE_T SYSCTL_ADD_UQUAD
+#else
+#define SYSCTL_ADD_BUS_SIZE_T(ctx, parent, nbr, name, flag, ptr, desc)
\
+ SYSCTL_ADD_UINT(ctx, parent, nbr, name, flag, ptr, 0, desc)
+#endif
+
+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->common.alignment <= bz->alignment) &&
+ (dmat->common.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->common.lowaddr;
+ bz->alignment = MAX(dmat->common.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);
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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