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x86: Fix uv bau sending buffer initialization

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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>
This commit is contained in:
Cliff Wickman
2009-06-24 09:41:59 -05:00
committed by Ingo Molnar
parent 7262b6e4a4
commit 9c26f52b90
1 changed files with 2 additions and 7 deletions
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arch/x86/kernel/tlb_uv.c
+2 -7
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@@ -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