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Subject[PATCH 4/8 v3] x86, UV: correct reset_with_ipi()
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From: Cliff Wickman <cpw@sgi.com>

Fix reset_with_ipi() to look up a cpu for a blade based on the
distribution map being indexed by the potentially sparsely numbered pnode
(relative to the partition base pnode). (It had been doing it based on
0-based, consecutive blade id.)

This patch is critical to tlb shootdown on a congested UV system.

Diffed against 3.0.0-rc3

Signed-off-by: Cliff Wickman <cpw@sgi.com>
---
arch/x86/platform/uv/tlb_uv.c | 33 +++++++++++++++++++++------------
1 file changed, 21 insertions(+), 12 deletions(-)
Index: linux/arch/x86/platform/uv/tlb_uv.c
===================================================================
--- linux.orig/arch/x86/platform/uv/tlb_uv.c
+++ linux/arch/x86/platform/uv/tlb_uv.c
@@ -296,14 +296,18 @@ static void bau_process_message(struct m
}

/*
- * Determine the first cpu on a uvhub.
+ * Determine the first cpu on a pnode.
*/
-static int uvhub_to_first_cpu(int uvhub)
+static int pnode_to_first_cpu(int pnode, struct bau_control *smaster)
{
int cpu;
- for_each_present_cpu(cpu)
- if (uvhub == uv_cpu_to_blade_id(cpu))
+ struct hub_and_pnode *hpp;
+
+ for_each_present_cpu(cpu) {
+ hpp = &smaster->thp[cpu];
+ if (pnode == hpp->pnode)
return cpu;
+ }
return -1;
}

@@ -366,23 +370,28 @@ static void do_reset(void *ptr)
* Use IPI to get all target uvhubs to release resources held by
* a given sending cpu number.
*/
-static void reset_with_ipi(struct bau_targ_hubmask *distribution, int sender)
+static void reset_with_ipi(struct bau_targ_hubmask *distribution,
+ struct bau_control *bcp)
{
- int uvhub;
+ int pnode;
+ int apnode;
int maskbits;
cpumask_t mask;
+ int sender = bcp->cpu;
+ struct bau_control *smaster = bcp->socket_master;
struct reset_args reset_args;

reset_args.sender = sender;
cpus_clear(mask);
/* find a single cpu for each uvhub in this distribution mask */
maskbits = sizeof(struct bau_targ_hubmask) * BITSPERBYTE;
- for (uvhub = 0; uvhub < maskbits; uvhub++) {
+ /* each bit is a pnode relative to the partition base pnode */
+ for (pnode = 0; pnode < maskbits; pnode++) {
int cpu;
- if (!bau_uvhub_isset(uvhub, distribution))
+ if (!bau_uvhub_isset(pnode, distribution))
continue;
- /* find a cpu for this uvhub */
- cpu = uvhub_to_first_cpu(uvhub);
+ apnode = pnode + bcp->partition_base_pnode;
+ cpu = pnode_to_first_cpu(apnode, smaster);
cpu_set(cpu, mask);
}

@@ -604,7 +613,7 @@ static void destination_plugged(struct b
quiesce_local_uvhub(hmaster);

spin_lock(&hmaster->queue_lock);
- reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ reset_with_ipi(&bau_desc->distribution, bcp);
spin_unlock(&hmaster->queue_lock);

end_uvhub_quiesce(hmaster);
@@ -626,7 +635,7 @@ static void destination_timeout(struct b
quiesce_local_uvhub(hmaster);

spin_lock(&hmaster->queue_lock);
- reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ reset_with_ipi(&bau_desc->distribution, bcp);
spin_unlock(&hmaster->queue_lock);

end_uvhub_quiesce(hmaster);

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