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authorKumar Gala <galak@kernel.crashing.org>2009-03-19 03:55:41 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-03-24 13:47:32 +1100
commit2319f1239592d0de80414ad2338c2bd7384a2a41 (patch)
tree805de041dfc84ae9ca767c9767d833977654dbe0 /arch/powerpc/include/asm/mmu.h
parenteb3436a0139a651a39dbb37a75b10a2cccd00ad5 (diff)
powerpc/mm: e300c2/c3/c4 TLB errata workaround
Complete workaround for DTLB errata in e300c2/c3/c4 processors. Due to the bug, the hardware-implemented LRU algorythm always goes to way 1 of the TLB. This fix implements the proposed software workaround in form of a LRW table for chosing the TLB-way. Based on patch from David Jander <david@protonic.nl> Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu.h')
-rw-r--r--arch/powerpc/include/asm/mmu.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index dc82dcd06ae..c073de4af84 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -46,6 +46,12 @@
*/
#define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
+/* This indicates that the processor doesn't handle way selection
+ * properly and needs SW to track and update the LRU state. This
+ * is specific to an errata on e300c2/c3/c4 class parts
+ */
+#define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000)
+
#ifndef __ASSEMBLY__
#include <asm/cputable.h>