From 39847e7f3c8198b14102fe7ba4b3a6a1d84bbcfe Mon Sep 17 00:00:00 2001
From: Cliff Wickman <cpw@sgi.com>
Date: Wed, 2 Jun 2010 16:22:02 -0500
Subject: [PATCH] x86, UV: Correct BAU software acknowledge
Correct the acknowledgment and the reset of a BAU
software-acknowledged message.
A retry message should be testing only for timed-out resources
(mask << 8). (And we delete a log message that might cause
unnecessary concern) The acknowledge MMR is
|--timed-out--|---pending--|, each is 8 bits.
The IPI-driven reset of software acknowledge resources frees
both timed out and pending resources.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004aP-7O@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/tlb_uv.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index d75929039846..295a41122da1 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -161,15 +161,14 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
slot2 = msg2 - mdp->va_queue_first;
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
- msg_res = ((msg2->sw_ack_vector << 8) |
- msg2->sw_ack_vector);
+ msg_res = msg2->sw_ack_vector;
/*
* This is a message retry; clear the resources held
* by the previous message only if they timed out.
* If it has not timed out we have an unexpected
* situation to report.
*/
- if (mmr & (msg_res << 8)) {
+ if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
/*
* is the resource timed out?
* make everyone ignore the cancelled message.
@@ -179,9 +178,9 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
cancel_count++;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
- (msg_res << 8) | msg_res);
- } else
- printk(KERN_INFO "note bau retry: no effect\n");
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
+ }
}
}
if (!cancel_count)
@@ -317,13 +316,13 @@ uv_do_reset(void *ptr)
*/
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
- msg_res = ((msg->sw_ack_vector << 8) |
- msg->sw_ack_vector);
+ msg_res = msg->sw_ack_vector;
if (mmr & msg_res) {
stat->d_rcanceled++;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
- msg_res);
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
}
}
}
--
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