git: c606ab59e7f9 - main - vm_extern: use standard address checkers everywhere
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Date: Fri, 31 Dec 2021 04:13:57 UTC
The branch main has been updated by dougm:
URL: https://cgit.FreeBSD.org/src/commit/?id=c606ab59e7f9423f7027320e9a4514c7db39658d
commit c606ab59e7f9423f7027320e9a4514c7db39658d
Author: Doug Moore <dougm@FreeBSD.org>
AuthorDate: 2021-12-31 04:09:08 +0000
Commit: Doug Moore <dougm@FreeBSD.org>
CommitDate: 2021-12-31 04:09:08 +0000
vm_extern: use standard address checkers everywhere
Define simple functions for alignment and boundary checks and use them
everywhere instead of having slightly different implementations
scattered about. Define them in vm_extern.h and use them where
possible where vm_extern.h is included.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D33685
---
sys/arm/arm/busdma_machdep.c | 15 +-
sys/arm64/arm64/busdma_bounce.c | 17 +-
sys/dev/iommu/busdma_iommu.c | 6 +-
sys/dev/iommu/iommu.h | 10 -
sys/dev/iommu/iommu_gas.c | 2 +-
sys/mips/mips/busdma_machdep.c | 1545 ++++++++++++++++++++++++++++++++++
sys/powerpc/powerpc/busdma_machdep.c | 17 +-
sys/riscv/riscv/busdma_bounce.c | 15 +-
sys/riscv/riscv/busdma_machdep.c | 2 +-
sys/vm/vm_extern.h | 27 +
sys/vm/vm_map.c | 6 +-
sys/vm/vm_page.c | 5 +-
sys/vm/vm_phys.c | 4 +-
sys/vm/vm_reserv.c | 21 +-
sys/x86/x86/busdma_bounce.c | 23 +-
sys/x86/x86/busdma_machdep.c | 2 +-
16 files changed, 1624 insertions(+), 93 deletions(-)
diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
index 11c306526e0d..55e02bc122a1 100644
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -318,7 +318,7 @@ static __inline int
alignment_bounce(bus_dma_tag_t dmat, bus_addr_t addr)
{
- return (addr & (dmat->alignment - 1));
+ return (!vm_addr_align_ok(addr, dmat->alignment));
}
/*
@@ -1007,18 +1007,13 @@ 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->boundary - 1);
- if (dmat->boundary > 0) {
- baddr = (curaddr + dmat->boundary) & bmask;
- if (sgsize > (baddr - curaddr))
- sgsize = (baddr - curaddr);
- }
+ if (!vm_addr_bound_ok(curaddr, sgsize, dmat->boundary))
+ sgsize = roundup2(curaddr, dmat->boundary) - curaddr;
/*
* Insert chunk into a segment, coalescing with
@@ -1032,8 +1027,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
} else {
if (curaddr == segs[seg].ds_addr + segs[seg].ds_len &&
(segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
- (dmat->boundary == 0 ||
- (segs[seg].ds_addr & bmask) == (curaddr & bmask)))
+ vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
+ dmat->boundary))
segs[seg].ds_len += sgsize;
else {
if (++seg >= dmat->nsegments)
diff --git a/sys/arm64/arm64/busdma_bounce.c b/sys/arm64/arm64/busdma_bounce.c
index ef2608d2dadc..0597b6ae8187 100644
--- a/sys/arm64/arm64/busdma_bounce.c
+++ b/sys/arm64/arm64/busdma_bounce.c
@@ -197,7 +197,7 @@ static bool
alignment_bounce(bus_dma_tag_t dmat, bus_addr_t addr)
{
- return ((addr & (dmat->common.alignment - 1)) != 0);
+ return (!vm_addr_align_ok(addr, dmat->common.alignment));
}
static bool
@@ -616,7 +616,7 @@ bounce_bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
__func__, dmat, dmat->common.flags, ENOMEM);
free(*mapp, M_DEVBUF);
return (ENOMEM);
- } else if (vtophys(*vaddr) & (dmat->alloc_alignment - 1)) {
+ } else if (!vm_addr_align_ok(vtophys(*vaddr), dmat->alloc_alignment)) {
printf("bus_dmamem_alloc failed to align memory properly.\n");
}
dmat->map_count++;
@@ -767,18 +767,13 @@ static bus_size_t
_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);
- }
+ if (!vm_addr_bound_ok(curaddr, sgsize, dmat->common.boundary))
+ sgsize = roundup2(curaddr, dmat->common.boundary) - curaddr;
/*
* Insert chunk into a segment, coalescing with
@@ -792,8 +787,8 @@ _bus_dmamap_addseg(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t curaddr,
} 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)))
+ vm_addr_bound_ok(segs[seg].ds_addr, segs[seg].ds_len,
+ dmat->common.boundary))
segs[seg].ds_len += sgsize;
else {
if (++seg >= dmat->common.nsegments)
diff --git a/sys/dev/iommu/busdma_iommu.c b/sys/dev/iommu/busdma_iommu.c
index d32beee19be7..99d47f0b6ede 100644
--- a/sys/dev/iommu/busdma_iommu.c
+++ b/sys/dev/iommu/busdma_iommu.c
@@ -619,8 +619,8 @@ iommu_bus_dmamap_load_something1(struct bus_dma_tag_iommu *tag,
if (buflen1 > tag->common.maxsegsz)
buflen1 = tag->common.maxsegsz;
- KASSERT(((entry->start + offset) & (tag->common.alignment - 1))
- == 0,
+ KASSERT(vm_addr_align_ok(entry->start + offset,
+ tag->common.alignment),
("alignment failed: ctx %p start 0x%jx offset %x "
"align 0x%jx", ctx, (uintmax_t)entry->start, offset,
(uintmax_t)tag->common.alignment));
@@ -631,7 +631,7 @@ iommu_bus_dmamap_load_something1(struct bus_dma_tag_iommu *tag,
(uintmax_t)entry->start, (uintmax_t)entry->end,
(uintmax_t)tag->common.lowaddr,
(uintmax_t)tag->common.highaddr));
- KASSERT(iommu_test_boundary(entry->start + offset, buflen1,
+ KASSERT(vm_addr_bound_ok(entry->start + offset, buflen1,
tag->common.boundary),
("boundary failed: ctx %p start 0x%jx end 0x%jx "
"boundary 0x%jx", ctx, (uintmax_t)entry->start,
diff --git a/sys/dev/iommu/iommu.h b/sys/dev/iommu/iommu.h
index dd803e84c2ee..ee1149e6ea8f 100644
--- a/sys/dev/iommu/iommu.h
+++ b/sys/dev/iommu/iommu.h
@@ -148,16 +148,6 @@ struct iommu_ctx {
#define IOMMU_DOMAIN_UNLOCK(dom) mtx_unlock(&(dom)->lock)
#define IOMMU_DOMAIN_ASSERT_LOCKED(dom) mtx_assert(&(dom)->lock, MA_OWNED)
-static inline bool
-iommu_test_boundary(iommu_gaddr_t start, iommu_gaddr_t size,
- iommu_gaddr_t boundary)
-{
-
- if (boundary == 0)
- return (true);
- return (start + size <= ((start + boundary) & ~(boundary - 1)));
-}
-
void iommu_free_ctx(struct iommu_ctx *ctx);
void iommu_free_ctx_locked(struct iommu_unit *iommu, struct iommu_ctx *ctx);
struct iommu_ctx *iommu_get_ctx(struct iommu_unit *, device_t dev,
diff --git a/sys/dev/iommu/iommu_gas.c b/sys/dev/iommu/iommu_gas.c
index c4faebec9d08..a38835566fba 100644
--- a/sys/dev/iommu/iommu_gas.c
+++ b/sys/dev/iommu/iommu_gas.c
@@ -314,7 +314,7 @@ iommu_gas_match_one(struct iommu_gas_match_args *a, iommu_gaddr_t beg,
return (false);
/* No boundary crossing. */
- if (iommu_test_boundary(a->entry->start + a->offset, a->size,
+ if (vm_addr_bound_ok(a->entry->start + a->offset, a->size,
a->common->boundary))
return (true);
diff --git a/sys/mips/mips/busdma_machdep.c b/sys/mips/mips/busdma_machdep.c
new file mode 100644
index 000000000000..348c1d98c328
--- /dev/null
+++ b/sys/mips/mips/busdma_machdep.c
@@ -0,0 +1,1545 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2006 Oleksandr Tymoshenko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification, immediately at the beginning of the file.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * From i386/busdma_machdep.c,v 1.26 2002/04/19 22:58:09 alfred
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * MIPS bus dma support routines
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/bus.h>
+#include <sys/busdma_bufalloc.h>
+#include <sys/interrupt.h>
+#include <sys/lock.h>
+#include <sys/proc.h>
+#include <sys/memdesc.h>
+#include <sys/mutex.h>
+#include <sys/ktr.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#include <sys/uio.h>
+
+#include <vm/uma.h>
+#include <vm/vm.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_page.h>
+#include <vm/vm_phys.h>
+#include <vm/vm_map.h>
+
+#include <machine/atomic.h>
+#include <machine/bus.h>
+#include <machine/cache.h>
+#include <machine/cpufunc.h>
+#include <machine/cpuinfo.h>
+#include <machine/md_var.h>
+
+#define MAX_BPAGES 64
+#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
+#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
+
+/*
+ * On XBurst cores from Ingenic, cache-line writeback is local
+ * only, unless accompanied by invalidation. Invalidations force
+ * dirty line writeout and invalidation requests forwarded to
+ * other cores if other cores have the cache line dirty.
+ */
+#if defined(SMP) && defined(CPU_XBURST)
+#define BUS_DMA_FORCE_WBINV
+#endif
+
+struct bounce_zone;
+
+struct bus_dma_tag {
+ bus_dma_tag_t parent;
+ bus_size_t alignment;
+ bus_addr_t boundary;
+ bus_addr_t lowaddr;
+ bus_addr_t highaddr;
+ bus_dma_filter_t *filter;
+ void *filterarg;
+ bus_size_t maxsize;
+ u_int nsegments;
+ bus_size_t maxsegsz;
+ int flags;
+ int ref_count;
+ int map_count;
+ bus_dma_lock_t *lockfunc;
+ void *lockfuncarg;
+ bus_dma_segment_t *segments;
+ struct bounce_zone *bounce_zone;
+};
+
+struct bounce_page {
+ vm_offset_t vaddr; /* kva of bounce buffer */
+ vm_offset_t vaddr_nocache; /* kva of bounce buffer uncached */
+ bus_addr_t busaddr; /* Physical address */
+ vm_offset_t datavaddr; /* kva of client data */
+ bus_addr_t dataaddr; /* client physical address */
+ bus_size_t datacount; /* client data count */
+ STAILQ_ENTRY(bounce_page) links;
+};
+
+struct sync_list {
+ vm_offset_t vaddr; /* kva of bounce buffer */
+ bus_addr_t busaddr; /* Physical address */
+ bus_size_t datacount; /* client data count */
+};
+
+struct bounce_zone {
+ STAILQ_ENTRY(bounce_zone) links;
+ STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
+ int total_bpages;
+ int free_bpages;
+ int reserved_bpages;
+ int active_bpages;
+ int total_bounced;
+ int total_deferred;
+ int map_count;
+ bus_size_t alignment;
+ bus_addr_t lowaddr;
+ char zoneid[8];
+ char lowaddrid[20];
+ struct sysctl_ctx_list sysctl_tree;
+ struct sysctl_oid *sysctl_tree_top;
+};
+
+static struct mtx bounce_lock;
+static int total_bpages;
+static int busdma_zonecount;
+static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
+
+static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0,
+ "Busdma parameters");
+SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0,
+ "Total bounce pages");
+
+#define DMAMAP_UNCACHEABLE 0x08
+#define DMAMAP_CACHE_ALIGNED 0x10
+
+struct bus_dmamap {
+ struct bp_list bpages;
+ int pagesneeded;
+ int pagesreserved;
+ bus_dma_tag_t dmat;
+ struct memdesc mem;
+ int flags;
+ TAILQ_ENTRY(bus_dmamap) freelist;
+ STAILQ_ENTRY(bus_dmamap) links;
+ bus_dmamap_callback_t *callback;
+ void *callback_arg;
+ int sync_count;
+ struct sync_list *slist;
+};
+
+static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist;
+static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist;
+
+static void init_bounce_pages(void *dummy);
+static int alloc_bounce_zone(bus_dma_tag_t dmat);
+static int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages);
+static int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
+ int commit);
+static bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map,
+ vm_offset_t vaddr, bus_addr_t addr,
+ bus_size_t size);
+static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage);
+
+/* Default tag, as most drivers provide no parent tag. */
+bus_dma_tag_t mips_root_dma_tag;
+
+static uma_zone_t dmamap_zone; /* Cache of struct bus_dmamap items */
+
+static busdma_bufalloc_t coherent_allocator; /* Cache of coherent buffers */
+static busdma_bufalloc_t standard_allocator; /* Cache of standard buffers */
+
+MALLOC_DEFINE(M_BUSDMA, "busdma", "busdma metadata");
+MALLOC_DEFINE(M_BOUNCE, "bounce", "busdma bounce pages");
+
+/*
+ * This is the ctor function passed to uma_zcreate() for the pool of dma maps.
+ * It'll need platform-specific changes if this code is copied.
+ */
+static int
+dmamap_ctor(void *mem, int size, void *arg, int flags)
+{
+ bus_dmamap_t map;
+ bus_dma_tag_t dmat;
+
+ map = (bus_dmamap_t)mem;
+ dmat = (bus_dma_tag_t)arg;
+
+ dmat->map_count++;
+
+ bzero(map, sizeof(*map));
+ map->dmat = dmat;
+ STAILQ_INIT(&map->bpages);
+
+ return (0);
+}
+
+/*
+ * This is the dtor function passed to uma_zcreate() for the pool of dma maps.
+ * It may need platform-specific changes if this code is copied .
+ */
+static void
+dmamap_dtor(void *mem, int size, void *arg)
+{
+ bus_dmamap_t map;
+
+ map = (bus_dmamap_t)mem;
+
+ map->dmat->map_count--;
+}
+
+static void
+busdma_init(void *dummy)
+{
+
+ /* Create a cache of maps for bus_dmamap_create(). */
+ dmamap_zone = uma_zcreate("dma maps", sizeof(struct bus_dmamap),
+ dmamap_ctor, dmamap_dtor, NULL, NULL, UMA_ALIGN_PTR, 0);
+
+ /* Create a cache of buffers in standard (cacheable) memory. */
+ standard_allocator = busdma_bufalloc_create("buffer",
+ mips_dcache_max_linesize, /* minimum_alignment */
+ NULL, /* uma_alloc func */
+ NULL, /* uma_free func */
+ 0); /* uma_zcreate_flags */
+
+ /*
+ * Create a cache of buffers in uncacheable memory, to implement the
+ * BUS_DMA_COHERENT flag.
+ */
+ coherent_allocator = busdma_bufalloc_create("coherent",
+ mips_dcache_max_linesize, /* minimum_alignment */
+ busdma_bufalloc_alloc_uncacheable,
+ busdma_bufalloc_free_uncacheable,
+ 0); /* uma_zcreate_flags */
+}
+SYSINIT(busdma, SI_SUB_KMEM, SI_ORDER_FOURTH, busdma_init, NULL);
+
+/*
+ * Return true if a match is made.
+ *
+ * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
+ *
+ * If paddr is within the bounds of the dma tag then call the filter callback
+ * to check for a match, if there is no filter callback then assume a match.
+ */
+static int
+run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
+{
+ int retval;
+
+ retval = 0;
+
+ do {
+ if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr)
+ || !vm_addr_align_ok(paddr, dmat->alignment))
+ && (dmat->filter == NULL
+ || (*dmat->filter)(dmat->filterarg, paddr) != 0))
+ retval = 1;
+
+ dmat = dmat->parent;
+ } while (retval == 0 && dmat != NULL);
+ return (retval);
+}
+
+/*
+ * Check to see if the specified page is in an allowed DMA range.
+ */
+
+static __inline int
+_bus_dma_can_bounce(vm_offset_t lowaddr, vm_offset_t highaddr)
+{
+ int i;
+ for (i = 0; phys_avail[i] && phys_avail[i + 1]; i += 2) {
+ if ((lowaddr >= phys_avail[i] && lowaddr <= phys_avail[i + 1])
+ || (lowaddr < phys_avail[i] &&
+ highaddr > phys_avail[i]))
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * Convenience function for manipulating driver locks from busdma (during
+ * busdma_swi, for example).
+ */
+void
+busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
+{
+ struct mtx *dmtx;
+
+ dmtx = (struct mtx *)arg;
+ switch (op) {
+ case BUS_DMA_LOCK:
+ mtx_lock(dmtx);
+ break;
+ case BUS_DMA_UNLOCK:
+ mtx_unlock(dmtx);
+ break;
+ default:
+ panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
+ }
+}
+
+/*
+ * dflt_lock should never get called. It gets put into the dma tag when
+ * lockfunc == NULL, which is only valid if the maps that are associated
+ * with the tag are meant to never be defered.
+ * XXX Should have a way to identify which driver is responsible here.
+ */
+static void
+dflt_lock(void *arg, bus_dma_lock_op_t op)
+{
+#ifdef INVARIANTS
+ panic("driver error: busdma dflt_lock called");
+#else
+ printf("DRIVER_ERROR: busdma dflt_lock called\n");
+#endif
+}
+
+static __inline bus_dmamap_t
+_busdma_alloc_dmamap(bus_dma_tag_t dmat)
+{
+ struct sync_list *slist;
+ bus_dmamap_t map;
+
+ slist = malloc(sizeof(*slist) * dmat->nsegments, M_BUSDMA, M_NOWAIT);
+ if (slist == NULL)
+ return (NULL);
+ map = uma_zalloc_arg(dmamap_zone, dmat, M_NOWAIT);
+ if (map != NULL)
+ map->slist = slist;
+ else
+ free(slist, M_BUSDMA);
+ return (map);
+}
+
+static __inline void
+_busdma_free_dmamap(bus_dmamap_t map)
+{
+
+ free(map->slist, M_BUSDMA);
+ uma_zfree(dmamap_zone, map);
+}
+
+/*
+ * Allocate a device specific dma_tag.
+ */
+#define SEG_NB 1024
+
+int
+bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
+ bus_addr_t boundary, bus_addr_t lowaddr,
+ bus_addr_t highaddr, bus_dma_filter_t *filter,
+ void *filterarg, bus_size_t maxsize, int nsegments,
+ bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
+ void *lockfuncarg, bus_dma_tag_t *dmat)
+{
+ bus_dma_tag_t newtag;
+ int error = 0;
+ /* Return a NULL tag on failure */
+ *dmat = NULL;
+ if (!parent)
+ parent = mips_root_dma_tag;
+
+ newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_BUSDMA, M_NOWAIT);
+ if (newtag == NULL) {
+ CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
+ __func__, newtag, 0, error);
+ return (ENOMEM);
+ }
+
+ newtag->parent = parent;
+ newtag->alignment = alignment;
+ newtag->boundary = boundary;
+ newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1);
+ newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1);
+ newtag->filter = filter;
+ newtag->filterarg = filterarg;
+ newtag->maxsize = maxsize;
+ newtag->nsegments = nsegments;
+ newtag->maxsegsz = maxsegsz;
+ newtag->flags = flags;
+ if (cpuinfo.cache_coherent_dma)
+ newtag->flags |= BUS_DMA_COHERENT;
+ newtag->ref_count = 1; /* Count ourself */
+ newtag->map_count = 0;
+ if (lockfunc != NULL) {
+ newtag->lockfunc = lockfunc;
+ newtag->lockfuncarg = lockfuncarg;
+ } else {
+ newtag->lockfunc = dflt_lock;
+ newtag->lockfuncarg = NULL;
+ }
+ newtag->segments = NULL;
+
+ /*
+ * Take into account any restrictions imposed by our parent tag
+ */
+ if (parent != NULL) {
+ newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr);
+ newtag->highaddr = MAX(parent->highaddr, newtag->highaddr);
+ if (newtag->boundary == 0)
+ newtag->boundary = parent->boundary;
+ else if (parent->boundary != 0)
+ newtag->boundary =
+ MIN(parent->boundary, newtag->boundary);
+ if ((newtag->filter != NULL) ||
+ ((parent->flags & BUS_DMA_COULD_BOUNCE) != 0))
+ newtag->flags |= BUS_DMA_COULD_BOUNCE;
+ if (newtag->filter == NULL) {
+ /*
+ * Short circuit looking at our parent directly
+ * since we have encapsulated all of its information
+ */
+ newtag->filter = parent->filter;
+ newtag->filterarg = parent->filterarg;
+ newtag->parent = parent->parent;
+ }
+ if (newtag->parent != NULL)
+ atomic_add_int(&parent->ref_count, 1);
+ }
+ if (_bus_dma_can_bounce(newtag->lowaddr, newtag->highaddr)
+ || newtag->alignment > 1)
+ newtag->flags |= BUS_DMA_COULD_BOUNCE;
+
+ if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
+ (flags & BUS_DMA_ALLOCNOW) != 0) {
+ struct bounce_zone *bz;
+
+ /* Must bounce */
+
+ if ((error = alloc_bounce_zone(newtag)) != 0) {
+ free(newtag, M_BUSDMA);
+ return (error);
+ }
+ bz = newtag->bounce_zone;
+
+ if (ptoa(bz->total_bpages) < maxsize) {
+ int pages;
+
+ pages = atop(maxsize) - bz->total_bpages;
+
+ /* Add pages to our bounce pool */
+ if (alloc_bounce_pages(newtag, pages) < pages)
+ error = ENOMEM;
+ }
+ /* Performed initial allocation */
+ newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
+ } else
+ newtag->bounce_zone = NULL;
+ if (error != 0)
+ free(newtag, M_BUSDMA);
+ else
+ *dmat = newtag;
+ CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
+ __func__, newtag, (newtag != NULL ? newtag->flags : 0), error);
+
+ return (error);
+}
+
+void
+bus_dma_template_clone(bus_dma_template_t *t, bus_dma_tag_t dmat)
+{
+
+ if (t == NULL || dmat == NULL)
+ return;
+
+ t->parent = dmat->parent;
+ t->alignment = dmat->alignment;
+ t->boundary = dmat->boundary;
+ t->lowaddr = dmat->lowaddr;
+ t->highaddr = dmat->highaddr;
+ t->maxsize = dmat->maxsize;
+ t->nsegments = dmat->nsegments;
+ t->maxsegsize = dmat->maxsegsz;
+ t->flags = dmat->flags;
+ t->lockfunc = dmat->lockfunc;
+ t->lockfuncarg = dmat->lockfuncarg;
+}
+
+int
+bus_dma_tag_set_domain(bus_dma_tag_t dmat, int domain)
+{
+
+ return (0);
+}
+
+int
+bus_dma_tag_destroy(bus_dma_tag_t dmat)
+{
+#ifdef KTR
+ bus_dma_tag_t dmat_copy = dmat;
+#endif
+
+ if (dmat != NULL) {
+ if (dmat->map_count != 0)
+ return (EBUSY);
+
+ while (dmat != NULL) {
+ bus_dma_tag_t parent;
+
+ parent = dmat->parent;
+ atomic_subtract_int(&dmat->ref_count, 1);
+ if (dmat->ref_count == 0) {
+ if (dmat->segments != NULL)
+ free(dmat->segments, M_BUSDMA);
+ free(dmat, M_BUSDMA);
+ /*
+ * Last reference count, so
+ * release our reference
+ * count on our parent.
+ */
+ dmat = parent;
+ } else
+ dmat = NULL;
+ }
+ }
+ CTR2(KTR_BUSDMA, "%s tag %p", __func__, dmat_copy);
+
+ return (0);
+}
+
+#include <sys/kdb.h>
+/*
+ * Allocate a handle for mapping from kva/uva/physical
+ * address space into bus device space.
+ */
+int
+bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
+{
+ bus_dmamap_t newmap;
+ int error = 0;
+
+ if (dmat->segments == NULL) {
+ dmat->segments = (bus_dma_segment_t *)malloc(
+ sizeof(bus_dma_segment_t) * dmat->nsegments, M_BUSDMA,
+ M_NOWAIT);
+ if (dmat->segments == NULL) {
+ CTR3(KTR_BUSDMA, "%s: tag %p error %d",
+ __func__, dmat, ENOMEM);
+ return (ENOMEM);
+ }
+ }
+
+ newmap = _busdma_alloc_dmamap(dmat);
+ if (newmap == NULL) {
+ CTR3(KTR_BUSDMA, "%s: tag %p error %d", __func__, dmat, ENOMEM);
+ return (ENOMEM);
+ }
+ *mapp = newmap;
+
+ /*
+ * Bouncing might be required if the driver asks for an active
+ * exclusion region, a data alignment that is stricter than 1, and/or
+ * an active address boundary.
+ */
+ if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
+ /* Must bounce */
+ struct bounce_zone *bz;
+ int maxpages;
+
+ if (dmat->bounce_zone == NULL) {
+ if ((error = alloc_bounce_zone(dmat)) != 0) {
+ _busdma_free_dmamap(newmap);
+ *mapp = NULL;
+ return (error);
+ }
+ }
+ bz = dmat->bounce_zone;
+
+ /* Initialize the new map */
+ STAILQ_INIT(&((*mapp)->bpages));
+
+ /*
+ * Attempt to add pages to our pool on a per-instance
+ * basis up to a sane limit.
+ */
+ maxpages = MAX_BPAGES;
+ if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
+ || (bz->map_count > 0 && bz->total_bpages < maxpages)) {
+ int pages;
+
+ pages = MAX(atop(dmat->maxsize), 1);
+ pages = MIN(maxpages - bz->total_bpages, pages);
+ pages = MAX(pages, 1);
+ if (alloc_bounce_pages(dmat, pages) < pages)
+ error = ENOMEM;
+
+ if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
+ if (error == 0)
+ dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
+ } else {
+ error = 0;
+ }
+ }
+ bz->map_count++;
+ }
+
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->flags, error);
+
+ return (0);
+}
+
+/*
+ * Destroy a handle for mapping from kva/uva/physical
+ * address space into bus device space.
+ */
+int
+bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+
+ if (STAILQ_FIRST(&map->bpages) != NULL || map->sync_count != 0) {
+ CTR3(KTR_BUSDMA, "%s: tag %p error %d",
+ __func__, dmat, EBUSY);
+ return (EBUSY);
+ }
+ if (dmat->bounce_zone)
+ dmat->bounce_zone->map_count--;
+ _busdma_free_dmamap(map);
+ CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat);
+ return (0);
+}
+
+/*
+ * Allocate a piece of memory that can be efficiently mapped into
+ * bus device space based on the constraints lited in the dma tag.
+ * A dmamap to for use with dmamap_load is also allocated.
+ */
+int
+bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddrp, int flags,
+ bus_dmamap_t *mapp)
+{
+ bus_dmamap_t newmap = NULL;
+ busdma_bufalloc_t ba;
+ struct busdma_bufzone *bufzone;
+ vm_memattr_t memattr;
+ void *vaddr;
+
+ int mflags;
+
+ if (flags & BUS_DMA_NOWAIT)
+ mflags = M_NOWAIT;
+ else
+ mflags = M_WAITOK;
+ if (dmat->segments == NULL) {
+ dmat->segments = (bus_dma_segment_t *)malloc(
+ sizeof(bus_dma_segment_t) * dmat->nsegments, M_BUSDMA,
+ mflags);
+ if (dmat->segments == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->flags, ENOMEM);
+ return (ENOMEM);
+ }
+ }
+
+ newmap = _busdma_alloc_dmamap(dmat);
+ if (newmap == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->flags, ENOMEM);
+ return (ENOMEM);
+ }
+
+ /*
+ * If all the memory is coherent with DMA then we don't need to
+ * do anything special for a coherent mapping request.
+ */
+ if (dmat->flags & BUS_DMA_COHERENT)
+ flags &= ~BUS_DMA_COHERENT;
+
+ if (flags & BUS_DMA_COHERENT) {
+ memattr = VM_MEMATTR_UNCACHEABLE;
+ ba = coherent_allocator;
+ newmap->flags |= DMAMAP_UNCACHEABLE;
+ } else {
+ memattr = VM_MEMATTR_DEFAULT;
+ ba = standard_allocator;
+ }
+ /* All buffers we allocate are cache-aligned. */
+ newmap->flags |= DMAMAP_CACHE_ALIGNED;
+
+ if (flags & BUS_DMA_ZERO)
+ mflags |= M_ZERO;
+
+ /*
+ * Try to find a bufzone in the allocator that holds a cache of buffers
+ * of the right size for this request. If the buffer is too big to be
+ * held in the allocator cache, this returns NULL.
+ */
+ bufzone = busdma_bufalloc_findzone(ba, dmat->maxsize);
+
+ /*
+ * Allocate the buffer from the uma(9) allocator if...
+ * - It's small enough to be in the allocator (bufzone not NULL).
+ * - The alignment constraint isn't larger than the allocation size
+ * (the allocator aligns buffers to their size boundaries).
+ * - There's no need to handle lowaddr/highaddr exclusion zones.
+ * else allocate non-contiguous pages if...
+ * - The page count that could get allocated doesn't exceed
+ * nsegments also when the maximum segment size is less
+ * than PAGE_SIZE.
+ * - The alignment constraint isn't larger than a page boundary.
+ * - There are no boundary-crossing constraints.
+ * else allocate a block of contiguous pages because one or more of the
+ * constraints is something that only the contig allocator can fulfill.
+ */
+ if (bufzone != NULL && dmat->alignment <= bufzone->size &&
+ !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) {
+ vaddr = uma_zalloc(bufzone->umazone, mflags);
+ } else if (dmat->nsegments >=
+ howmany(dmat->maxsize, MIN(dmat->maxsegsz, PAGE_SIZE)) &&
+ dmat->alignment <= PAGE_SIZE &&
+ (dmat->boundary % PAGE_SIZE) == 0) {
+ vaddr = (void *)kmem_alloc_attr(dmat->maxsize, mflags, 0,
+ dmat->lowaddr, memattr);
+ } else {
+ vaddr = (void *)kmem_alloc_contig(dmat->maxsize, mflags, 0,
+ dmat->lowaddr, dmat->alignment, dmat->boundary, memattr);
+ }
+ if (vaddr == NULL) {
+ _busdma_free_dmamap(newmap);
+ newmap = NULL;
+ } else {
+ newmap->sync_count = 0;
+ }
+ *vaddrp = vaddr;
+ *mapp = newmap;
+
+ return (vaddr == NULL ? ENOMEM : 0);
+}
+
+/*
+ * Free a piece of memory and it's allocated dmamap, that was allocated
+ * via bus_dmamem_alloc. Make the same choice for free/contigfree.
+ */
+void
+bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
+{
+ struct busdma_bufzone *bufzone;
+ busdma_bufalloc_t ba;
+
+ if (map->flags & DMAMAP_UNCACHEABLE)
+ ba = coherent_allocator;
+ else
+ ba = standard_allocator;
+
+ free(map->slist, M_BUSDMA);
+ uma_zfree(dmamap_zone, map);
+
+ bufzone = busdma_bufalloc_findzone(ba, dmat->maxsize);
+
+ if (bufzone != NULL && dmat->alignment <= bufzone->size &&
+ !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr))
+ uma_zfree(bufzone->umazone, vaddr);
+ else
+ kmem_free((vm_offset_t)vaddr, dmat->maxsize);
+ CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags);
+}
+
+static void
+_bus_dmamap_count_phys(bus_dma_tag_t dmat, bus_dmamap_t map, vm_paddr_t buf,
+ bus_size_t buflen, int flags)
+{
+ bus_addr_t curaddr;
+ bus_size_t sgsize;
+
+ if (map->pagesneeded == 0) {
+ CTR3(KTR_BUSDMA, "lowaddr= %d, boundary= %d, alignment= %d",
+ dmat->lowaddr, dmat->boundary, dmat->alignment);
+ CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d",
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