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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-20 17:23:22 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-24 18:13:44 +1000
commit8fc1f5d7eff9a4ed0cdb7215e7ca4b82b931d6d7 (patch)
tree63ecb8026f3b56bbc2da276b23d4d06fbccf467e /arch
parent1ad936e850a896bc16e0d72a56be432f9954ad7e (diff)
powerpc: Fix TLB cleanup at boot on POWER8
The TLB has 512 congruence classes (2048 entries 4 way set associative) while P7 had 128 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/cpu_setup_power.S8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
index a283b6442b26..18b5b9cf8e37 100644
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -135,8 +135,12 @@ __init_HFSCR:
blr
__init_TLB:
- /* Clear the TLB */
- li r6,128
+ /*
+ * Clear the TLB using the "IS 3" form of tlbiel instruction
+ * (invalidate by congruence class). P7 has 128 CCs, P8 has 512
+ * so we just always do 512
+ */
+ li r6,512
mtctr r6
li r7,0xc00 /* IS field = 0b11 */
ptesync