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Add support for using cached mbuf and cluster phys addrs.

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This commit is contained in:
thorpej 2003-04-09 23:32:03 +00:00
parent cc1db07645
commit a10453bb40
1 changed files with 44 additions and 4 deletions
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48
sys/arch/alpha/common/bus_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.52 2003/04/01 02:20:14 thorpej Exp $ */
/* $NetBSD: bus_dma.c,v 1.53 2003/04/09 23:32:03 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -39,7 +39,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.52 2003/04/01 02:20:14 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.53 2003/04/09 23:32:03 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -291,8 +291,48 @@ _bus_dmamap_load_mbuf_direct(bus_dma_tag_t t, bus_dmamap_t map,
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
error = _bus_dmamap_load_buffer_direct(t, map,
m->m_data, m->m_len, NULL, flags, &lastaddr, &seg, first);
if (m->m_len == 0)
continue;
/* XXX Could be better about coalescing. */
/* XXX Doesn't check boundaries. */
switch (m->m_flags & (M_EXT|M_EXT_CLUSTER)) {
case M_EXT|M_EXT_CLUSTER:
/* XXX KDASSERT */
KASSERT(m->m_ext.ext_paddr != M_PADDR_INVALID);
lastaddr = m->m_ext.ext_paddr +
(m->m_data - m->m_ext.ext_buf);
have_addr:
if (first == 0 &&
++seg >= map->_dm_segcnt) {
error = EFBIG;
break;
}
/*
* If we're beyond the current DMA window, indicate
* that and try to fall back into SGMAPs.
*/
if (t->_wsize != 0 && lastaddr >= t->_wsize) {
error = EINVAL;
break;
}
lastaddr |= t->_wbase;
map->dm_segs[seg].ds_addr = lastaddr;
map->dm_segs[seg].ds_len = m->m_len;
lastaddr += m->m_len;
break;
case 0:
lastaddr = m->m_paddr + M_BUFOFFSET(m) +
(m->m_data - M_BUFADDR(m));
goto have_addr;
default:
error = _bus_dmamap_load_buffer_direct(t, map,
m->m_data, m->m_len, NULL, flags, &lastaddr,
&seg, first);
}
first = 0;
}
if (error == 0) {