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From: Kumar Gala <galak@kernel.crashing.org>
To: linuxppc-dev@ozlabs.org
Subject: [PATCH v7 3/4] powerpc/fsl-booke: Fixup 64-bit PTE reading for SMP support
Date: Wed, 17 Sep 2008 18:00:04 -0500	[thread overview]
Message-ID: <1221692405-19880-3-git-send-email-galak@kernel.crashing.org> (raw)
In-Reply-To: <1221692405-19880-2-git-send-email-galak@kernel.crashing.org>

We need to create a false data dependency to ensure the loads of
the pte are done in the right order.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/kernel/head_fsl_booke.S |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 3cb52fa..377e0c1 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -579,13 +579,19 @@ interrupt_base:
 
 	FIND_PTE
 	andc.	r13,r13,r11		/* Check permission */
-	bne	2f			/* Bail if permission mismach */
 
 #ifdef CONFIG_PTE_64BIT
-	lwz	r13, 0(r12)
+#ifdef CONFIG_SMP
+	subf	r10,r11,r12		/* create false data dep */
+	lwzx	r13,r11,r10		/* Get upper pte bits */
+#else
+	lwz	r13,0(r12)		/* Get upper pte bits */
+#endif
 #endif
 
-	 /* Jump to common tlb load */
+	bne	2f			/* Bail if permission/valid mismach */
+
+	/* Jump to common tlb load */
 	b	finish_tlb_load
 2:
 	/* The bailout.  Restore registers to pre-exception conditions
@@ -640,10 +646,20 @@ interrupt_base:
 
 	FIND_PTE
 	andc.	r13,r13,r11		/* Check permission */
+
+#ifdef CONFIG_PTE_64BIT
+#ifdef CONFIG_SMP
+	subf	r10,r11,r12		/* create false data dep */
+	lwzx	r13,r11,r10		/* Get upper pte bits */
+#else
+	lwz	r13,0(r12)		/* Get upper pte bits */
+#endif
+#endif
+
 	bne	2f			/* Bail if permission mismach */
 
 #ifdef CONFIG_PTE_64BIT
-	lwz	r13, 0(r12)
+	lwz	r13,0(r12)
 #endif
 
 	/* Jump to common TLB load point */
@@ -702,7 +718,7 @@ interrupt_base:
 /*
  * Both the instruction and data TLB miss get to this
  * point to load the TLB.
- *	r10 - EA of fault
+ *	r10 - available to use
  *	r11 - TLB (info from Linux PTE)
  *	r12 - available to use
  *	r13 - upper bits of PTE (if PTE_64BIT) or available to use
-- 
1.5.5.1

  reply	other threads:[~2008-09-17 23:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-17 23:00 [PATCH v7 1/4] powerpc: Introduce local (non-broadcast) forms of tlb invalidates Kumar Gala
2008-09-17 23:00 ` [PATCH v7 2/4] powerpc: Fixes for CONFIG_PTE_64BIT for SMP support Kumar Gala
2008-09-17 23:00   ` Kumar Gala [this message]
2008-09-17 23:00     ` [PATCH v7 4/4] powerpc/mm: Implement _PAGE_SPECIAL & pte_special() for 32-bit Kumar Gala

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