From 590711b7dd731bb04e7892c0451566d788985e79 Mon Sep 17 00:00:00 2001 From: Jack Steiner Date: Tue, 6 Dec 2005 08:05:24 -0600 Subject: [PATCH] [IA64-SGI] Fix SN PTC deadlock recovery 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 Signed-off-by: Tony Luck --- arch/ia64/sn/kernel/sn2/ptc_deadlock.S | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/ia64/sn/kernel/sn2/ptc_deadlock.S b/arch/ia64/sn/kernel/sn2/ptc_deadlock.S index 3fa95065a44..bebbcc4f8dd 100644 --- a/arch/ia64/sn/kernel/sn2/ptc_deadlock.S +++ b/arch/ia64/sn/kernel/sn2/ptc_deadlock.S @@ -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 -- 2.20.1