Skip site navigation (1)Skip section navigation (2)
Date:      Tue, 4 Jun 2019 15:32:56 +0000 (UTC)
From:      Ruslan Bukin <br@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org
Subject:   svn commit: r348621 - in stable/12/sys: conf riscv/include riscv/riscv
Message-ID:  <201906041532.x54FWuGN038194@repo.freebsd.org>

next in thread | raw e-mail | index | archive | help
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 <kib@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 ***



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201906041532.x54FWuGN038194>