redonkable/alistair23-linux
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x86: UV: BAU partition-relative distribution map

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This patch enables each partition's BAU distribution bit map
to be partition-relative.

The distribution bitmap had been constructed assuming 0 as the base
node number.  That construct would not have allowed a total system of
greater than 256 nodes.
It also corrects an error that occurred when the first blade's nasid
was not zero.  That nasid was stored as the base node.
The base node number gets added by hardware to the node numbers implied
in the distribution bitmap, resulting in invalid target nasids.

Tested on the UV hardware simulator.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
LKML-Reference: <E1Ltl0C-0004Ob-37@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cliff Wickman 2009-04-14 10:56:48 -05:00 committed by Ingo Molnar
parent 54c28d294c
commit 94ca8e4852
1 changed files with 16 additions and 3 deletions
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19
arch/x86/kernel/tlb_uv.c
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@ -25,6 +25,8 @@ static int uv_bau_retry_limit __read_mostly;
/* position of pnode (which is nasid>>1): */
static int uv_nshift __read_mostly;
/* base pnode in this partition */
static int uv_partition_base_pnode __read_mostly;
static unsigned long uv_mmask __read_mostly;
@ -43,7 +45,7 @@ static int __init blade_to_first_node(int blade)
if (blade == b)
return node;
}
BUG();
return -1; /* shouldn't happen */
}
/*
@ -359,7 +361,8 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
locals++;
continue;
}
bau_node_set(pnode, &bau_desc->distribution);
bau_node_set(pnode - uv_partition_base_pnode,
&bau_desc->distribution);
i++;
}
if (i == 0) {
@ -728,7 +731,12 @@ uv_activation_descriptor_init(int node, int pnode)
for (i = 0, ad2 = adp; i < UV_ACTIVATION_DESCRIPTOR_SIZE; i++, ad2++) {
memset(ad2, 0, sizeof(struct bau_desc));
ad2->header.sw_ack_flag = 1;
ad2->header.base_dest_nodeid = uv_cpu_to_pnode(0);
/*
* base_dest_nodeid is the first node in the partition, so
* the bit map will indicate partition-relative node numbers.
* note that base_dest_nodeid is actually a nasid.
*/
ad2->header.base_dest_nodeid = uv_partition_base_pnode << 1;
ad2->header.command = UV_NET_ENDPOINT_INTD;
ad2->header.int_both = 1;
/*
@ -825,6 +833,11 @@ static int __init uv_bau_init(void)
kmalloc(nblades * sizeof(struct bau_control *), GFP_KERNEL);
BUG_ON(!uv_bau_table_bases);
uv_partition_base_pnode = 0x7fffffff;
for (blade = 0; blade < nblades; blade++)
if (uv_blade_nr_possible_cpus(blade) &&
(uv_blade_to_pnode(blade) < uv_partition_base_pnode))
uv_partition_base_pnode = uv_blade_to_pnode(blade);
for (blade = 0; blade < nblades; blade++)
if (uv_blade_nr_possible_cpus(blade))
uv_init_blade(blade);