Author: br
Date: Tue Jun 4 15:32:56 2019
New Revision: 348621
URL: https://svnweb.freebsd.org/changeset/base/348621
Log:
MFC r347225:
Provide a template for busdma code for RISC-V.
RISC-V ISA specifies no cache management instructions so leave cache
operations in cpufunc.h as no-op for now.
Note some new hardware comes with their own memory-mapped cache
management controller.
Tested on HiFive Unleashed board with cgem(4).
Sponsored by: DARPA, AFRL
Added:
stable/12/sys/riscv/include/bus_dma_impl.h (contents, props changed)
stable/12/sys/riscv/riscv/busdma_bounce.c (contents, props changed)
Modified:
stable/12/sys/conf/files.riscv
stable/12/sys/riscv/include/bus_dma.h
stable/12/sys/riscv/include/cpufunc.h
stable/12/sys/riscv/riscv/busdma_machdep.c
stable/12/sys/riscv/riscv/machdep.c
Modified: stable/12/sys/conf/files.riscv
==============================================================================
--- stable/12/sys/conf/files.riscv Tue Jun 4 15:30:46 2019
(r348620)
+++ stable/12/sys/conf/files.riscv Tue Jun 4 15:32:56 2019
(r348621)
@@ -28,6 +28,7 @@ libkern/memset.c standard
riscv/riscv/autoconf.c standard
riscv/riscv/bus_machdep.c standard
riscv/riscv/bus_space_asm.S standard
+riscv/riscv/busdma_bounce.c standard
riscv/riscv/busdma_machdep.c standard
riscv/riscv/clock.c standard
riscv/riscv/copyinout.S standard
Modified: stable/12/sys/riscv/include/bus_dma.h
==============================================================================
--- stable/12/sys/riscv/include/bus_dma.h Tue Jun 4 15:30:46 2019
(r348620)
+++ stable/12/sys/riscv/include/bus_dma.h Tue Jun 4 15:32:56 2019
(r348621)
@@ -3,7 +3,139 @@
#ifndef _MACHINE_BUS_DMA_H_
#define _MACHINE_BUS_DMA_H_
+#define WANT_INLINE_DMAMAP
#include <sys/bus_dma.h>
-#include <sys/bus_dma_internal.h>
+
+#include <machine/bus_dma_impl.h>
+
+/*
+ * Allocate a handle for mapping from kva/uva/physical
+ * address space into bus device space.
+ */
+static inline int
+bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->map_create(dmat, flags, mapp));
+}
+
+/*
+ * Destroy a handle for mapping from kva/uva/physical
+ * address space into bus device space.
+ */
+static inline int
+bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->map_destroy(dmat, map));
+}
+
+/*
+ * Allocate a piece of memory that can be efficiently mapped into
+ * bus device space based on the constraints listed in the dma tag.
+ * A dmamap to for use with dmamap_load is also allocated.
+ */
+static inline int
+bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
+ bus_dmamap_t *mapp)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->mem_alloc(dmat, vaddr, flags, mapp));
+}
+
+/*
+ * 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 inline void
+bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ tc->impl->mem_free(dmat, vaddr, map);
+}
+
+/*
+ * Release the mapping held by map.
+ */
+static inline void
+bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ tc->impl->map_unload(dmat, map);
+}
+
+static inline void
+bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ tc->impl->map_sync(dmat, map, op);
+}
+
+static inline int
+_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)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->load_phys(dmat, map, buf, buflen, flags, segs,
+ segp));
+}
+
+static inline int
+_bus_dmamap_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)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->load_ma(dmat, map, ma, tlen, ma_offs, flags,
+ segs, segp));
+}
+
+static inline int
+_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
+ bus_size_t buflen, struct pmap *pmap, int flags, bus_dma_segment_t *segs,
+ int *segp)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->load_buffer(dmat, map, buf, buflen, pmap, flags, segs,
+ segp));
+}
+
+static inline void
+_bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map,
+ struct memdesc *mem, bus_dmamap_callback_t *callback, void *callback_arg)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ tc->impl->map_waitok(dmat, map, mem, callback, callback_arg);
+}
+
+static inline bus_dma_segment_t *
+_bus_dmamap_complete(bus_dma_tag_t dmat, bus_dmamap_t map,
+ bus_dma_segment_t *segs, int nsegs, int error)
+{
+ struct bus_dma_tag_common *tc;
+
+ tc = (struct bus_dma_tag_common *)dmat;
+ return (tc->impl->map_complete(dmat, map, segs, nsegs, error));
+}
#endif /* !_MACHINE_BUS_DMA_H_ */
Added: stable/12/sys/riscv/include/bus_dma_impl.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/12/sys/riscv/include/bus_dma_impl.h Tue Jun 4 15:32:56 2019
(r348621)
@@ -0,0 +1,96 @@
+/*-
+ * 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 _MACHINE_BUS_DMA_IMPL_H_
+#define _MACHINE_BUS_DMA_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, struct pmap *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 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
Modified: stable/12/sys/riscv/include/cpufunc.h
==============================================================================
--- stable/12/sys/riscv/include/cpufunc.h Tue Jun 4 15:30:46 2019
(r348620)
+++ stable/12/sys/riscv/include/cpufunc.h Tue Jun 4 15:32:56 2019
(r348621)
@@ -109,6 +109,17 @@ sfence_vma_page(uintptr_t addr)
#define rdinstret() csr_read64(instret)
#define rdhpmcounter(n) csr_read64(hpmcounter##n)
+extern int64_t dcache_line_size;
+extern int64_t icache_line_size;
+
+#define cpu_dcache_wbinv_range(a, s)
+#define cpu_dcache_inv_range(a, s)
+#define cpu_dcache_wb_range(a, s)
+
+#define cpu_idcache_wbinv_range(a, s)
+#define cpu_icache_sync_range(a, s)
+#define cpu_icache_sync_range_checked(a, s)
+
static __inline void
load_satp(uint64_t val)
{
Added: stable/12/sys/riscv/riscv/busdma_bounce.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/12/sys/riscv/riscv/busdma_bounce.c Tue Jun 4 15:32:56 2019
(r348621)
@@ -0,0 +1,1330 @@
+/*-
+ * Copyright (c) 1997, 1998 Justin T. Gibbs.
+ * Copyright (c) 2015-2016 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship of the FreeBSD Foundation.
+ *
+ * Portions of this software were developed by Semihalf
+ * under sponsorship of 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,
+ * 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/bus_dma_impl.h>
+
+#define MAX_BPAGES 4096
+
+enum {
+ BF_COULD_BOUNCE = 0x01,
+ BF_MIN_ALLOC_COMP = 0x02,
+ BF_KMEM_ALLOC = 0x04,
+ BF_COHERENT = 0x10,
+};
+
+struct bounce_zone;
+
+struct bus_dma_tag {
+ struct bus_dma_tag_common common;
+ int map_count;
+ int bounce_flags;
+ 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 */
+ vm_page_t datapage; /* physical page of client data */
+ vm_offset_t dataoffs; /* page offset 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;
+
+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 sync_list {
+ vm_offset_t vaddr; /* kva of client data */
+ bus_addr_t paddr; /* physical address */
+ vm_page_t pages; /* starting page of client data */
+ bus_size_t datacount; /* client data count */
+};
+
+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;
+ u_int flags;
+#define DMAMAP_COULD_BOUNCE (1 << 0)
+#define DMAMAP_FROM_DMAMEM (1 << 1)
+ 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);
+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);
+
+/*
+ * 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 ((flags & BUS_DMA_COHERENT) != 0)
+ newtag->bounce_flags |= BF_COHERENT;
+
+ if (parent != NULL) {
+ if ((newtag->common.filter != NULL ||
+ (parent->bounce_flags & BF_COULD_BOUNCE) != 0))
+ newtag->bounce_flags |= BF_COULD_BOUNCE;
+
+ /* Copy some flags from the parent */
+ newtag->bounce_flags |= parent->bounce_flags & BF_COHERENT;
+ }
+
+ if (newtag->common.lowaddr < ptoa((vm_paddr_t)Maxmem) ||
+ newtag->common.alignment > 1)
+ newtag->bounce_flags |= BF_COULD_BOUNCE;
+
+ if (((newtag->bounce_flags & BF_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->bounce_flags |= BF_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);
+}
+
+static bus_dmamap_t
+alloc_dmamap(bus_dma_tag_t dmat, int flags)
+{
+ u_long mapsize;
+ bus_dmamap_t map;
+
+ mapsize = sizeof(*map);
+ mapsize += sizeof(struct sync_list) * dmat->common.nsegments;
+ map = malloc(mapsize, M_DEVBUF, flags | M_ZERO);
+ if (map == NULL)
+ return (NULL);
+
+ /* Initialize the new map */
+ STAILQ_INIT(&map->bpages);
+
+ return (map);
+}
+
+/*
+ * 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);
+ }
+ }
+
+ *mapp = alloc_dmamap(dmat, M_NOWAIT);
+ if (*mapp == 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->bounce_flags & BF_COULD_BOUNCE) {
+ /* Must bounce */
+ if (dmat->bounce_zone == NULL) {
+ if ((error = alloc_bounce_zone(dmat)) != 0) {
+ free(*mapp, M_DEVBUF);
+ return (error);
+ }
+ }
+ bz = dmat->bounce_zone;
+
+ (*mapp)->flags = DMAMAP_COULD_BOUNCE;
+
+ /*
+ * 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->bounce_flags & BF_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->bounce_flags & BF_MIN_ALLOC_COMP)
+ == 0) {
+ if (error == 0) {
+ dmat->bounce_flags |=
+ BF_MIN_ALLOC_COMP;
+ }
+ } else
+ error = 0;
+ }
+ bz->map_count++;
+ }
+ if (error == 0)
+ dmat->map_count++;
+ else
+ free(*mapp, M_DEVBUF);
+ 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)
+{
+
+ /* Check we are destroying the correct map type */
+ if ((map->flags & DMAMAP_FROM_DMAMEM) != 0)
+ panic("bounce_bus_dmamap_destroy: Invalid map freed\n");
+
+ 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) {
+ KASSERT((map->flags & DMAMAP_COULD_BOUNCE) != 0,
+ ("%s: Bounce zone when cannot bounce", __func__));
+ 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)
+{
+ /*
+ * XXX ARM64TODO:
+ * This bus_dma implementation requires IO-Coherent architecutre.
+ * If IO-Coherency is not guaranteed, the BUS_DMA_COHERENT flag has
+ * to be implented using non-cacheable memory.
+ */
+
+ vm_memattr_t attr;
+ 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->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 if ((flags & BUS_DMA_COHERENT) != 0 &&
+ (dmat->bounce_flags & BF_COHERENT) == 0)
+ /*
+ * If we have a non-coherent tag, and are trying to allocate
+ * a coherent block of memory it needs to be uncached.
+ */
+ attr = VM_MEMATTR_UNCACHEABLE;
+ else
+ attr = VM_MEMATTR_DEFAULT;
+
+ /*
+ * Create the map, but don't set the could bounce flag as
+ * this allocation should never bounce;
+ */
+ *mapp = alloc_dmamap(dmat, mflags);
+ if (*mapp == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->common.flags, ENOMEM);
+ return (ENOMEM);
+ }
+ (*mapp)->flags = DMAMAP_FROM_DMAMEM;
+
+ /*
+ * Allocate the buffer from the malloc(9) allocator if...
+ * - It's small enough to fit into a single power of two sized bucket.
+ * - The alignment is less than or equal to the maximum size
+ * - The low address requirement is fulfilled.
+ * 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.
+ *
+ * NOTE: The (dmat->common.alignment <= dmat->maxsize) check
+ * below is just a quick hack. The exact alignment guarantees
+ * of malloc(9) need to be nailed down, and the code below
+ * should be rewritten to take that into account.
+ *
+ * In the meantime 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 >=
+ howmany(dmat->common.maxsize, MIN(dmat->common.maxsegsz,
PAGE_SIZE)) &&
+ dmat->common.alignment <= PAGE_SIZE &&
+ (dmat->common.boundary % PAGE_SIZE) == 0) {
+ /* Page-based multi-segment allocations allowed */
+ *vaddr = (void *)kmem_alloc_attr(dmat->common.maxsize, mflags,
+ 0ul, dmat->common.lowaddr, attr);
+ dmat->bounce_flags |= BF_KMEM_ALLOC;
+ } else {
+ *vaddr = (void *)kmem_alloc_contig(dmat->common.maxsize, mflags,
+ 0ul, dmat->common.lowaddr, dmat->common.alignment != 0 ?
+ dmat->common.alignment : 1ul, dmat->common.boundary, attr);
+ dmat->bounce_flags |= BF_KMEM_ALLOC;
+ }
+ if (*vaddr == NULL) {
+ CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
+ __func__, dmat, dmat->common.flags, ENOMEM);
+ free(*mapp, M_DEVBUF);
+ return (ENOMEM);
+ } else if (vtophys(*vaddr) & (dmat->common.alignment - 1)) {
+ printf("bus_dmamem_alloc failed to align memory properly.\n");
+ }
+ dmat->map_count++;
+ 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)
+{
+
+ /*
+ * Check the map came from bounce_bus_dmamem_alloc, so the map
+ * should be NULL and the BF_KMEM_ALLOC flag cleared if malloc()
+ * was used and set if kmem_alloc_contig() was used.
+ */
+ if ((map->flags & DMAMAP_FROM_DMAMEM) == 0)
+ panic("bus_dmamem_free: Invalid map freed\n");
+ if ((dmat->bounce_flags & BF_KMEM_ALLOC) == 0)
+ free(vaddr, M_DEVBUF);
+ else
+ kmem_free((vm_offset_t)vaddr, dmat->common.maxsize);
+ free(map, M_DEVBUF);
+ dmat->map_count--;
+ CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat,
+ dmat->bounce_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->flags & DMAMAP_COULD_BOUNCE) != 0 && 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 - (curaddr & PAGE_MASK));
+ 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->flags & DMAMAP_COULD_BOUNCE) != 0 && 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);
+ CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", map,
+ 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)
+{
+ struct sync_list *sl;
+ bus_size_t sgsize;
+ bus_addr_t curaddr, sl_end;
+ int error;
+
+ if (segs == NULL)
+ segs = dmat->segments;
+
+ if ((dmat->bounce_flags & BF_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);
+ }
+ }
+
+ sl = map->slist + map->sync_count - 1;
+ sl_end = 0;
+
+ while (buflen > 0) {
+ curaddr = buf;
+ sgsize = MIN(buflen, dmat->common.maxsegsz);
+ if (((dmat->bounce_flags & BF_COULD_BOUNCE) != 0) &&
+ map->pagesneeded != 0 &&
+ bus_dma_run_filter(&dmat->common, curaddr)) {
+ sgsize = MIN(sgsize, PAGE_SIZE - (curaddr & PAGE_MASK));
+ curaddr = add_bounce_page(dmat, map, 0, curaddr,
+ sgsize);
+ } else if ((dmat->bounce_flags & BF_COHERENT) == 0) {
+ if (map->sync_count > 0)
+ sl_end = sl->paddr + sl->datacount;
+
+ if (map->sync_count == 0 || curaddr != sl_end) {
+ if (++map->sync_count > dmat->common.nsegments)
+ break;
+ sl++;
+ sl->vaddr = 0;
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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