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authorCliff Wickman <cpw@sgi.com>2009-06-24 09:41:59 -0500
committerIngo Molnar <mingo@elte.hu>2009-06-24 17:33:58 +0200
commit9c26f52b900f7207135bafc8789e1a4f5d43e096 (patch)
treef867c60908809f960a50f12aa9860c04c66ae815 /arch
parent7262b6e4a4cc18d0f67df145d032c843e4bc382b (diff)
downloadop-kernel-dev-9c26f52b900f7207135bafc8789e1a4f5d43e096.zip
op-kernel-dev-9c26f52b900f7207135bafc8789e1a4f5d43e096.tar.gz
x86: Fix uv bau sending buffer initialization
The initialization of the UV Broadcast Assist Unit's sending buffers was making an invalid assumption about the initialization of an MMR that defines its address. The BIOS will not be providing that MMR. So uv_activation_descriptor_init() should unconditionally set it. Tested on UV simulator. Signed-off-by: Cliff Wickman <cpw@sgi.com> Cc: <stable@kernel.org> # for v2.6.30.x LKML-Reference: <E1MJTfj-0005i1-W8@eag09.americas.sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/tlb_uv.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 124d40c..8ccabb8 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -711,7 +711,6 @@ uv_activation_descriptor_init(int node, int pnode)
unsigned long pa;
unsigned long m;
unsigned long n;
- unsigned long mmr_image;
struct bau_desc *adp;
struct bau_desc *ad2;
@@ -727,12 +726,8 @@ uv_activation_descriptor_init(int node, int pnode)
n = pa >> uv_nshift;
m = pa & uv_mmask;
- mmr_image = uv_read_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE);
- if (mmr_image) {
- uv_write_global_mmr64(pnode, (unsigned long)
- UVH_LB_BAU_SB_DESCRIPTOR_BASE,
- (n << UV_DESC_BASE_PNODE_SHIFT | m));
- }
+ uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
+ (n << UV_DESC_BASE_PNODE_SHIFT | m));
/*
* initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
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