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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
[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 <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
authored by Jack Steiner and committed by Tony Luck 590711b7 bd1d6e24
+6
-2
arch/ia64/sn/kernel/sn2/ptc_deadlock.S
+6
-2
arch/ia64/sn/kernel/sn2/ptc_deadlock.S
···
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mov r8=r0
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1:
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+
cmp.ne p8,p9=r0,ptc1 // Test for shub type (ptc1 non-null on shub1)
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// p8 = 1 if shub1, p9 = 1 if shub2
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+
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add scr2=ALIAS_OFFSET,piowc // Address of WRITE_STATUS alias register
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-
;;
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-
ld8.acq scr1=[scr2];;
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+
mov scr1=7;; // Clear DEADLOCK, WRITE_ERROR, MULTI_WRITE_ERROR
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(p8) st8.rel [scr2]=scr1;;
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(p9) ld8.acq scr1=[scr2];;
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5: ld8.acq scr1=[piowc];; // Wait for PIOs to complete.
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hint @pause