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Sync w/ i386 port: 

When loading a DMA map, if the page's physical address exceeds the bounce
threshold, return an error to the caller (the caller will attempt to
bounce the transfer).
This commit is contained in:
thorpej 1998-06-03 06:41:51 +00:00
parent b5c2ecc231
commit 6ffa35b390
1 changed files with 14 additions and 5 deletions
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19
sys/arch/bebox/bebox/bus_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.11 1998/06/03 04:30:20 thorpej Exp $ */
/* $NetBSD: bus_dma.c,v 1.12 1998/06/03 06:41:51 thorpej Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@ -129,7 +129,7 @@
#include <bebox/isa/isa_machdep.h>
int _bus_dmamap_load_buffer __P((bus_dmamap_t, void *, bus_size_t,
struct proc *, int, vm_offset_t *, int *, int));
struct proc *, int, bus_addr_t, vm_offset_t *, int *, int));
/*
* Common function for DMA map creation. May be called by bus-specific
@ -221,7 +221,7 @@ _bus_dmamap_load(t, map, buf, buflen, p, flags)
seg = 0;
error = _bus_dmamap_load_buffer(map, buf, buflen, p, flags,
&lastaddr, &seg, 1);
t->_bounce_thresh, &lastaddr, &seg, 1);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
@ -262,7 +262,7 @@ _bus_dmamap_load_mbuf(t, map, m0, flags)
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
error = _bus_dmamap_load_buffer(map, m->m_data, m->m_len,
NULL, flags, &lastaddr, &seg, first);
NULL, flags, t->_bounce_thresh, &lastaddr, &seg, first);
first = 0;
}
if (error == 0) {
@ -502,12 +502,14 @@ _bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
* first indicates if this is the first invocation of this function.
*/
int
_bus_dmamap_load_buffer(map, buf, buflen, p, flags, lastaddrp, segp, first)
_bus_dmamap_load_buffer(map, buf, buflen, p, flags, bounce_thresh, lastaddrp,
segp, first)
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
bus_addr_t bounce_thresh;
vm_offset_t *lastaddrp;
int *segp;
int first;
@ -532,6 +534,13 @@ _bus_dmamap_load_buffer(map, buf, buflen, p, flags, lastaddrp, segp, first)
*/
curaddr = pmap_extract(pmap, vaddr);
/*
* If we're beyond the bounce threshold, notify
* the caller.
*/
if (bounce_thresh != 0 && curaddr >= bounce_thresh)
return (EINVAL);
/*
* Compute the segment size, and adjust counts.
*/