Commit-ID: 6c7184b77464261b7d55583a48accbd1350923a3
Gitweb: http://git.kernel.org/tip/6c7184b77464261b7d55583a48accbd1350923a3
Author: Jack Steiner <steiner@xxxxxxx>
AuthorDate: Mon, 27 Jul 2009 09:35:07 -0500
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 4 Aug 2009 16:18:01 +0200
x86, UV: Handle missing blade-local memory correctly
UV blades may not have any blade-local memory. Add a field
(nid) to the UV blade structure to indicates whether the node
has local memory. This is needed by the GRU driver (pushed
separately).
Signed-off-by: Jack Steiner <steiner@xxxxxxx>
Cc: linux-mm@xxxxxxxxx
LKML-Reference: <20090727143507.GA7006@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/include/asm/uv/uv_hub.h | 7 +++++++
arch/x86/kernel/apic/x2apic_uv_x.c | 5 +++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index 341070f..a6dde05 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -327,6 +327,7 @@ struct uv_blade_info {
unsigned short nr_possible_cpus;
unsigned short nr_online_cpus;
unsigned short pnode;
+ short memory_nid;
};
extern struct uv_blade_info *uv_blade_info;
extern short *uv_node_to_blade;
@@ -363,6 +364,12 @@ static inline int uv_blade_to_pnode(int bid)
return uv_blade_info[bid].pnode;
}
+/* Nid of memory node on blade. -1 if no blade-local memory */
+static inline int uv_blade_to_memory_nid(int bid)
+{
+ return uv_blade_info[bid].memory_nid;
+}
+
/* Determine the number of possible cpus on a blade */
static inline int uv_blade_nr_possible_cpus(int bid)
{
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 096d19a..ad3f0a9 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -591,6 +591,8 @@ void __init uv_system_init(void)
bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
uv_blade_info = kmalloc(bytes, GFP_KERNEL);
BUG_ON(!uv_blade_info);
+ for (blade = 0; blade < uv_num_possible_blades(); blade++)
+ uv_blade_info[blade].memory_nid = -1;
get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
@@ -629,6 +631,9 @@ void __init uv_system_init(void)
lcpu = uv_blade_info[blade].nr_possible_cpus;
uv_blade_info[blade].nr_possible_cpus++;
+ /* Any node on the blade, else will contain -1. */
+ uv_blade_info[blade].memory_nid = nid;
+
uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
uv_cpu_hub_info(cpu)->lowmem_remap_top = lowmem_redir_size;
uv_cpu_hub_info(cpu)->m_val = m_val;
--
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