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[PATCH] initialize TCE tables

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A fairly recent platform requirement states that the OS must clear the
whole TCE table at setup time, in case firmware left any active
mappings in it.  Without this initialization, dynamic bus removes can
fail.  Firmware rejects these requests if active mappings still exist 
for a slot that has been deallocated by the OS.

Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
John Rose 2005-06-20 21:43:48 +10:00 committed by Paul Mackerras
parent 0231c290d8
commit d3588ba9bb
1 changed files with 3 additions and 0 deletions
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3
arch/ppc64/kernel/iommu.c
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@ -423,6 +423,9 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl)
tbl->it_largehint = tbl->it_halfpoint;
spin_lock_init(&tbl->it_lock);
/* Clear the hardware table in case firmware left allocations in it */
ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
if (!welcomed) {
printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n",
novmerge ? "disabled" : "enabled");