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after enabling the streaming buffer, check to see that it is actually 

there and enabled.  if it appears to be missing or not enabled, do
not use it.
This commit is contained in:
mrg 2000-04-05 14:26:51 +00:00
parent ff95126059
commit 21adbdd7d0
1 changed files with 24 additions and 11 deletions
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35
sys/arch/sparc64/dev/iommu.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: iommu.c,v 1.4 2000/04/05 05:59:03 mrg Exp $ */
/* $NetBSD: iommu.c,v 1.5 2000/04/05 14:26:51 mrg Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -202,8 +202,13 @@ iommu_reset(is)
/* Need to do 64-bit stores */
bus_space_write_8(is->is_bustag, &is->is_iommu->iommu_cr, 0, is->is_cr);
bus_space_write_8(is->is_bustag, &is->is_iommu->iommu_tsb, 0, is->is_ptsb);
/* Enable diagnostics mode? */
bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_ctl, 0, STRBUF_EN);
/* No streaming buffers? Disable them */
if (bus_space_read_8(is->is_bustag, &is->is_sb->strbuf_ctl, 0) == 0)
is->is_sb = 0;
}
/*
@ -227,9 +232,11 @@ iommu_enter(is, va, pa, flags)
!(flags&BUS_DMA_COHERENT));
/* Is the streamcache flush really needed? */
bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_pgflush,
0, va);
iommu_flush(is);
if (is->is_sb) {
bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_pgflush, 0,
va);
iommu_flush(is);
}
DPRINTF(IDB_DVMA, ("Clearing TSB slot %d for va %p\n",
(int)IOTSBSLOT(va,is->is_tsbsize), va));
is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)] = tte;
@ -277,21 +284,24 @@ iommu_remove(is, va, len)
*
* If it takes more than .5 sec, something went wrong.
*/
DPRINTF(IDB_DVMA, ("iommu_remove: flushing va %p TSB[%lx]@%p=%lx, %lu bytes left\n",
if (is->is_sb) {
DPRINTF(IDB_DVMA, ("iommu_remove: flushing va %p TSB[%lx]@%p=%lx, %lu bytes left\n",
(long)va, (long)IOTSBSLOT(va,is->is_tsbsize),
(long)&is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)],
(long)(is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)]),
(u_long)len));
bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_pgflush, 0, va);
if (len <= NBPG) {
iommu_flush(is);
len = 0;
} else len -= NBPG;
DPRINTF(IDB_DVMA, ("iommu_remove: flushed va %p TSB[%lx]@%p=%lx, %lu bytes left\n",
bus_space_write_8(is->is_bustag,
&is->is_sb->strbuf_pgflush, 0, va);
if (len <= NBPG) {
iommu_flush(is);
len = 0;
} else len -= NBPG;
DPRINTF(IDB_DVMA, ("iommu_remove: flushed va %p TSB[%lx]@%p=%lx, %lu bytes left\n",
(long)va, (long)IOTSBSLOT(va,is->is_tsbsize),
(long)&is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)],
(long)(is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)]),
(u_long)len));
}
is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)] = 0;
bus_space_write_8(is->is_bustag, &is->is_iommu->iommu_flush, 0, va);
va += NBPG;
@ -315,6 +325,9 @@ iommu_flush(is)
} \
}
if (!is->is_sb)
return (0);
is->is_flush = 0;
membar_sync();
bus_space_write_8(is->is_bustag, &is->is_sb->strbuf_flushsync, 0, is->is_flushpa);