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authorJohn Rose <johnrose@austin.ibm.com>2005-06-20 21:43:48 +1000
committerPaul Mackerras <paulus@samba.org>2005-06-20 21:43:48 +1000
commitd3588ba9bbade7f1fde59726c9af43eeeb08e092 (patch)
tree13018804984c735be26325a234c09b1d6c4f6d4b /arch/ppc64
parent0231c290d817513d448963520a97eadd51a370b7 (diff)
[PATCH] initialize TCE tables
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>
Diffstat (limited to 'arch/ppc64')
-rw-r--r--arch/ppc64/kernel/iommu.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/iommu.c b/arch/ppc64/kernel/iommu.c
index 344164681d2..8316426ccaf 100644
--- a/arch/ppc64/kernel/iommu.c
+++ b/arch/ppc64/kernel/iommu.c
@@ -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");