x86, UV: Set DELIVERY_MODE=4 for vector=NMI_VECTOR in uv_hub_send_ipi()

commit 02dd0a0613e0d84c7dd8315e3fe6204d005b7c79 upstream.

When sending a NMI_VECTOR IPI using the UV_HUB_IPI_INT register,
we need to ensure the delivery mode field of that register has
NMI delivery selected.

This makes those IPIs true NMIs, instead of flat IPIs. It
matters to reboot sequences and KGDB, both of which use NMI
IPIs.

Signed-off-by: Robin Holt <holt@sgi.com>
Acked-by: Jack Steiner <steiner@sgi.com>
Cc: Martin Hicks <mort@sgi.com>
LKML-Reference: <20091020193620.877322000@alcatraz.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index 03a0cbdb3050f137984c9ea2d1a76f464ac108f0..ca1fe396ec0d34bc3ea2671d4dfc07d2e4efa699 100644 (file)
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -18,6 +18,8 @@
 #include <asm/types.h>
 #include <asm/percpu.h>
 #include <asm/uv/uv_mmrs.h>
+#include <asm/irq_vectors.h>
+#include <asm/io_apic.h>
 
 
 /*
@@ -420,9 +422,14 @@ static inline void uv_set_cpu_scir_bits(int cpu, unsigned char value)
 static inline void uv_hub_send_ipi(int pnode, int apicid, int vector)
 {
        unsigned long val;
+       unsigned long dmode = dest_Fixed;
+
+       if (vector == NMI_VECTOR)
+               dmode = dest_NMI;
 
        val = (1UL << UVH_IPI_INT_SEND_SHFT) |
                        ((apicid) << UVH_IPI_INT_APIC_ID_SHFT) |
+                       (dmode << UVH_IPI_INT_DELIVERY_MODE_SHFT) |
                        (vector << UVH_IPI_INT_VECTOR_SHFT);
        uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 }