* [PATCH] - Fix SN PTC deadlock recovery
@ 2005-12-06 14:05 Jack Steiner
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From: Jack Steiner @ 2005-12-06 14:05 UTC (permalink / raw)
To: linux-ia64
The patch that added support for a new platform chipset (shub2) broke
PTC deadlock recovery on older versions of the chipset. (PTCs are the
SN platform-specific method for doing a global TLB purge). This
patch fixes deadlock recovery so that it works on both the old & new
chipsets.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Index: linux/arch/ia64/sn/kernel/sn2/ptc_deadlock.S
=================================--- linux.orig/arch/ia64/sn/kernel/sn2/ptc_deadlock.S 2005-12-01 11:41:02.394548556 -0600
+++ linux/arch/ia64/sn/kernel/sn2/ptc_deadlock.S 2005-12-06 07:59:32.176021944 -0600
@@ -39,9 +39,13 @@ sn2_ptc_deadlock_recovery_core:
mov r8=r0
1:
+ cmp.ne p8,p9=r0,ptc1 // Test for shub type (ptc1 non-null on shub1)
+ // p8 = 1 if shub1, p9 = 1 if shub2
+
add scr2=ALIAS_OFFSET,piowc // Address of WRITE_STATUS alias register
- ;;
- ld8.acq scr1=[scr2];;
+ mov scr1=7;; // Clear DEADLOCK, WRITE_ERROR, MULTI_WRITE_ERROR
+(p8) st8.rel [scr2]=scr1;;
+(p9) ld8.acq scr1=[scr2];;
5: ld8.acq scr1=[piowc];; // Wait for PIOs to complete.
hint @pause
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