x86/platform/UV: Add Support for UV4 Hubless NMIs

Merge new UV Hubless NMI support into existing UV NMI handler.

Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Russ Anderson <rja@hpe.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Dimitri Sivanich <sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170125163517.585269837@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/uv/uv_hub.h

@@ -772,6 +772,7 @@ static inline int uv_num_possible_blades(void)
 
 /* Per Hub NMI support */
 extern void uv_nmi_setup(void);
+extern void uv_nmi_setup_hubless(void);
 
 /* BMC sets a bit this MMR non-zero before sending an NMI */
 #define UVH_NMI_MMR		UVH_SCRATCH5
@@ -799,6 +800,8 @@ struct uv_hub_nmi_s {
 	atomic_t	read_mmr_count;	/* count of MMR reads */
 	atomic_t	nmi_count;	/* count of true UV NMIs */
 	unsigned long	nmi_value;	/* last value read from NMI MMR */
+	bool		hub_present;	/* false means UV hubless system */
+	bool		pch_owner;	/* indicates this hub owns PCH */
 };
 
 struct uv_cpu_nmi_s {