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[IA64-SGI] Fix SN PTC deadlock recovery

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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>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Jack Steiner 2005-12-06 08:05:24 -06:00 committed by Tony Luck
parent bd1d6e2451
commit 590711b7dd
1 changed files with 6 additions and 2 deletions
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8
arch/ia64/sn/kernel/sn2/ptc_deadlock.S
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@ -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