x86, UV: Fix UV2 hub part number

There was a mixup when the SGI UV2 hub chip was sent to be
fabricated, and it ended up with the wrong part number in the
HRP_NODE_ID mmr. Future versions of the chip will (may) have the
correct part number. Change the UV infrastructure to recognize
both part numbers as valid IDs of a UV2 hub chip.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Link: http://lkml.kernel.org/r/20111129210058.GA20452@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/include/asm/uv/uv_mmrs.h b/arch/x86/include/asm/uv/uv_mmrs.h
index 10474fb1185d..cf1d73643f60 100644
--- a/arch/x86/include/asm/uv/uv_mmrs.h
+++ b/arch/x86/include/asm/uv/uv_mmrs.h
@@ -57,6 +57,7 @@
 
 #define UV1_HUB_PART_NUMBER     0x88a5
 #define UV2_HUB_PART_NUMBER     0x8eb8
+#define UV2_HUB_PART_NUMBER_X   0x1111
 
 /* Compat: if this #define is present, UV headers support UV2 */
 #define UV2_HUB_IS_SUPPORTED    1
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 62ae3001ae02..9d59bbacd4e3 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -93,6 +93,8 @@ static int __init early_get_pnodeid(void)
 
         if (node_id.s.part_number == UV2_HUB_PART_NUMBER)
                 uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;
+        if (node_id.s.part_number == UV2_HUB_PART_NUMBER_X)
+                uv_min_hub_revision_id += UV2_HUB_REVISION_BASE - 1;
 
         uv_hub_info->hub_revision = uv_min_hub_revision_id;
         pnode = (node_id.s.node_id >> 1) & ((1 << m_n_config.s.n_skt) - 1);