x86, UV: Fix for nodes with memory and no cpus

Fix initialization of UV blade information for systems that have
nodes with memory but no cpus.

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20090330140111.GA18461@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 1248318..de1a50a 100644 (file)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -549,7 +549,8 @@ void __init uv_system_init(void)
        unsigned long gnode_upper, lowmem_redir_base, lowmem_redir_size;
        int bytes, nid, cpu, lcpu, pnode, blade, i, j, m_val, n_val;
        int max_pnode = 0;
-       unsigned long mmr_base, present;
+       unsigned long mmr_base, present, paddr;
+       unsigned short pnode_mask;
 
        map_low_mmrs();
 
@@ -592,6 +593,7 @@ void __init uv_system_init(void)
                }
        }
 
+       pnode_mask = (1 << n_val) - 1;
        node_id.v = uv_read_local_mmr(UVH_NODE_ID);
        gnode_upper = (((unsigned long)node_id.s.node_id) &
                       ~((1 << n_val) - 1)) << m_val;
@@ -615,7 +617,7 @@ void __init uv_system_init(void)
                uv_cpu_hub_info(cpu)->numa_blade_id = blade;
                uv_cpu_hub_info(cpu)->blade_processor_id = lcpu;
                uv_cpu_hub_info(cpu)->pnode = pnode;
-               uv_cpu_hub_info(cpu)->pnode_mask = (1 << n_val) - 1;
+               uv_cpu_hub_info(cpu)->pnode_mask = pnode_mask;
                uv_cpu_hub_info(cpu)->gpa_mask = (1 << (m_val + n_val)) - 1;
                uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
                uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
@@ -631,6 +633,16 @@ void __init uv_system_init(void)
                        lcpu, blade);
        }
 
+       /* Add blade/pnode info for nodes without cpus */
+       for_each_online_node(nid) {
+               if (uv_node_to_blade[nid] >= 0)
+                       continue;
+               paddr = node_start_pfn(nid) << PAGE_SHIFT;
+               pnode = (paddr >> m_val) & pnode_mask;
+               blade = boot_pnode_to_blade(pnode);
+               uv_node_to_blade[nid] = blade;
+       }
+
        map_gru_high(max_pnode);
        map_mmr_high(max_pnode);
        map_config_high(max_pnode);