[IA64-SGI] - New SN hardware support - ptc_fixes

Shub2 provides a much improved mechanism for issuing internode
TLB purges. Add code to support the newer mechanism. There is also 
some debug code (disabled) that is useful for testing.

Collect statistics on the number, type & duration of TLB purges.
This data will be useful for making future improvements in the algorithms.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

include/asm-ia64/sn/nodepda.h

@@ -37,7 +37,6 @@ struct phys_cpuid {
 
 struct nodepda_s {
 	void 		*pdinfo;	/* Platform-dependent per-node info */
-	spinlock_t		bist_lock;
 
 	/*
 	 * The BTEs on this node are shared by the local cpus
@@ -55,6 +54,8 @@ struct nodepda_s {
 	 * Array of physical cpu identifiers. Indexed by cpuid.
 	 */
 	struct phys_cpuid	phys_cpuid[NR_CPUS];
+	spinlock_t		ptc_lock ____cacheline_aligned_in_smp;
+	spinlock_t		bist_lock;
 };
 
 typedef struct nodepda_s nodepda_t;