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Subject[PATCH 1/1] x86/platform/uv: Fix calculation of Global Physical Address
The calculation of the global physical address (GPA) on UV4 is
incorrect. The gnode_extra/upper global offset should only be
applied for fixed address space systems (UV1..3).

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Tested-by: John Estabrook <john.estabrook@hpe.com>
---
arch/x86/include/asm/uv/uv_hub.h | 8 +++++---
arch/x86/kernel/apic/x2apic_uv_x.c | 3 ++-
2 files changed, 7 insertions(+), 4 deletions(-)

--- linux.orig/arch/x86/include/asm/uv/uv_hub.h
+++ linux/arch/x86/include/asm/uv/uv_hub.h
@@ -485,15 +485,17 @@ static inline unsigned long uv_soc_phys_

if (paddr < uv_hub_info->lowmem_remap_top)
paddr |= uv_hub_info->lowmem_remap_base;
- paddr |= uv_hub_info->gnode_upper;
- if (m_val)
+
+ if (m_val) {
+ paddr |= uv_hub_info->gnode_upper;
paddr = ((paddr << uv_hub_info->m_shift)
>> uv_hub_info->m_shift) |
((paddr >> uv_hub_info->m_val)
<< uv_hub_info->n_lshift);
- else
+ } else {
paddr |= uv_soc_phys_ram_to_nasid(paddr)
<< uv_hub_info->gpa_shift;
+ }
return paddr;
}

--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1105,7 +1105,8 @@ void __init uv_init_hub_info(struct uv_h
node_id.v = uv_read_local_mmr(UVH_NODE_ID);
uv_cpuid.gnode_shift = max_t(unsigned int, uv_cpuid.gnode_shift, mn.n_val);
hi->gnode_extra = (node_id.s.node_id & ~((1 << uv_cpuid.gnode_shift) - 1)) >> 1;
- hi->gnode_upper = (unsigned long)hi->gnode_extra << mn.m_val;
+ if (mn.m_val)
+ hi->gnode_upper = (u64)hi->gnode_extra << mn.m_val;

if (uv_gp_table) {
hi->global_mmr_base = uv_gp_table->mmr_base;
--

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