[IA64] Optional method to purge the TLB on SN systems

This patch adds an optional method for purging the TLB on SN IA64 systems.
The change should not affect any non-SN system.

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

include/asm-ia64/hw_irq.h

@@ -66,6 +66,7 @@ extern int ia64_last_device_vector;
 #define IA64_PERFMON_VECTOR		0xee	/* performanc monitor interrupt vector */
 #define IA64_TIMER_VECTOR		0xef	/* use highest-prio group 15 interrupt for timer */
 #define	IA64_MCA_WAKEUP_VECTOR		0xf0	/* MCA wakeup (must be >MCA_RENDEZ_VECTOR) */
+#define IA64_IPI_LOCAL_TLB_FLUSH	0xfc	/* SMP flush local TLB */
 #define IA64_IPI_RESCHEDULE		0xfd	/* SMP reschedule */
 #define IA64_IPI_VECTOR			0xfe	/* inter-processor interrupt vector */
 

include/asm-ia64/tlbflush.h

@@ -27,9 +27,11 @@ extern void local_flush_tlb_all (void);
 #ifdef CONFIG_SMP
   extern void smp_flush_tlb_all (void);
   extern void smp_flush_tlb_mm (struct mm_struct *mm);
+  extern void smp_flush_tlb_cpumask (cpumask_t xcpumask);
 # define flush_tlb_all()	smp_flush_tlb_all()
 #else
 # define flush_tlb_all()	local_flush_tlb_all()
+# define smp_flush_tlb_cpumask(m) local_flush_tlb_all()
 #endif
 
 static inline void
@@ -94,6 +96,15 @@ flush_tlb_pgtables (struct mm_struct *mm, unsigned long start, unsigned long end
 	 */
 }
 
+/*
+ * Flush the local TLB. Invoked from another cpu using an IPI.
+ */
+#ifdef CONFIG_SMP
+void smp_local_flush_tlb(void);
+#else
+#define smp_local_flush_tlb()
+#endif
+
 #define flush_tlb_kernel_range(start, end)	flush_tlb_all()	/* XXX fix me */
 
 #endif /* _ASM_IA64_TLBFLUSH_H */