From patchwork Thu Oct 15 09:04:19 2009
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Subject: [1/8] 8xx: invalidate non present TLBs
From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
X-Patchwork-Id: 36091
Message-Id: <1255597466-30976-2-git-send-email-Joakim.Tjernlund@transmode.se>
To: Scott Wood <scottwood@freescale.com>, Rex Feany <RFeany@mrv.com>,
 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
 "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>
Date: Thu, 15 Oct 2009 11:04:19 +0200

8xx sometimes need to load a invalid/non-present TLBs in
it DTLB asm handler.
These must be invalidated separaly as linux mm don't.

---
arch/powerpc/mm/fault.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 7699394..071e0ca 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -39,7 +39,7 @@
 #include <asm/uaccess.h>
 #include <asm/tlbflush.h>
 #include <asm/siginfo.h>
-
+#include <mm/mmu_decl.h>
 
 #ifdef CONFIG_KPROBES
 static inline int notify_page_fault(struct pt_regs *regs)
@@ -243,6 +243,12 @@ good_area:
 		goto bad_area;
 #endif /* CONFIG_6xx */
 #if defined(CONFIG_8xx)
+	/* 8xx sometimes need to load a invalid/non-present TLBs.
+	 * These must be invalidated separately as linux mm don't.
+	 */
+	if (error_code & 0x40000000) /* no translation? */
+		_tlbil_va(address, 0, 0, 0);
+
         /* The MPC8xx seems to always set 0x80000000, which is
          * "undefined".  Of those that can be set, this is the only
          * one which seems bad.