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Date: Wed, 02 Jun 2010 16:22:02 -0500
From: Cliff Wickman <cpw@....com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, hpa@...or.com, gregkh@...e.de
Subject: [PATCH 11/11] x86, UV: modularize BAU send and wait
Streamline the large uv_flush_send_and_wait() function by use of a couple
of helper functions.
And remove some excess comments.
Diffed against 2.6.34 -tip
Signed-off-by: Cliff Wickman <cpw@....com>
---
arch/x86/include/asm/uv/uv_bau.h | 1
arch/x86/kernel/tlb_uv.c | 82 ++++++++++++++++++++-------------------
2 files changed, 44 insertions(+), 39 deletions(-)
Index: 100531.linux-tip/arch/x86/kernel/tlb_uv.c
===================================================================
--- 100531.linux-tip.orig/arch/x86/kernel/tlb_uv.c
+++ 100531.linux-tip/arch/x86/kernel/tlb_uv.c
@@ -485,6 +485,47 @@ static inline int atomic_inc_unless_ge(s
}
/*
+ * Our retries are blocked by all destination swack resources being
+ * in use, and a timeout is pending. In that case hardware immediately
+ * returns the ERROR that looks like a destination timeout.
+ */
+static void
+destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp,
+ struct bau_control *hmaster, struct ptc_stats *stat)
+{
+ udelay(bcp->plugged_delay);
+ bcp->plugged_tries++;
+ if (bcp->plugged_tries >= bcp->plugsb4reset) {
+ bcp->plugged_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_plug++;
+ }
+}
+
+static void
+destination_timeout(struct bau_desc *bau_desc, struct bau_control *bcp,
+ struct bau_control *hmaster, struct ptc_stats *stat)
+{
+ hmaster->max_bau_concurrent = 1;
+ bcp->timeout_tries++;
+ if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
+ bcp->timeout_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_timeout++;
+ }
+}
+
+/*
* Completions are taking a very long time due to a congested numalink
* network.
*/
@@ -518,7 +559,7 @@ disable_for_congestion(struct bau_contro
*
* Send a broadcast and wait for it to complete.
*
- * The flush_mask contains the cpus the broadcast is to be sent to, plus
+ * The flush_mask contains the cpus the broadcast is to be sent to including
* cpus that are on the local uvhub.
*
* Returns 0 if all flushing represented in the mask was done.
@@ -553,7 +594,6 @@ int uv_flush_send_and_wait(struct bau_de
&hmaster->active_descriptor_count,
hmaster->max_bau_concurrent));
}
-
while (hmaster->uvhub_quiesce)
cpu_relax();
@@ -584,40 +624,9 @@ int uv_flush_send_and_wait(struct bau_de
right_shift, this_cpu, bcp, smaster, try);
if (completion_status == FLUSH_RETRY_PLUGGED) {
- /*
- * Our retries may be blocked by all destination swack
- * resources being consumed, and a timeout pending. In
- * that case hardware immediately returns the ERROR
- * that looks like a destination timeout.
- */
- udelay(bcp->plugged_delay);
- bcp->plugged_tries++;
- if (bcp->plugged_tries >= bcp->plugsb4reset) {
- bcp->plugged_tries = 0;
- quiesce_local_uvhub(hmaster);
- spin_lock(&hmaster->queue_lock);
- uv_reset_with_ipi(&bau_desc->distribution,
- this_cpu);
- spin_unlock(&hmaster->queue_lock);
- end_uvhub_quiesce(hmaster);
- bcp->ipi_attempts++;
- stat->s_resets_plug++;
- }
+ destination_plugged(bau_desc, bcp, hmaster, stat);
} else if (completion_status == FLUSH_RETRY_TIMEOUT) {
- hmaster->max_bau_concurrent = 1;
- bcp->timeout_tries++;
- udelay(TIMEOUT_DELAY);
- if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
- bcp->timeout_tries = 0;
- quiesce_local_uvhub(hmaster);
- spin_lock(&hmaster->queue_lock);
- uv_reset_with_ipi(&bau_desc->distribution,
- this_cpu);
- spin_unlock(&hmaster->queue_lock);
- end_uvhub_quiesce(hmaster);
- bcp->ipi_attempts++;
- stat->s_resets_timeout++;
- }
+ destination_timeout(bau_desc, bcp, hmaster, stat);
}
if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
bcp->ipi_attempts = 0;
@@ -628,10 +637,8 @@ int uv_flush_send_and_wait(struct bau_de
} while ((completion_status == FLUSH_RETRY_PLUGGED) ||
(completion_status == FLUSH_RETRY_TIMEOUT));
time2 = get_cycles();
-
bcp->plugged_tries = 0;
bcp->timeout_tries = 0;
-
if ((completion_status == FLUSH_COMPLETE) &&
(bcp->conseccompletes > bcp->complete_threshold) &&
(hmaster->max_bau_concurrent <
@@ -740,7 +747,6 @@ const struct cpumask *uv_flush_tlb_other
bau_desc = bcp->descriptor_base;
bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu;
-
bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
/* cpu statistics */
Index: 100531.linux-tip/arch/x86/include/asm/uv/uv_bau.h
===================================================================
--- 100531.linux-tip.orig/arch/x86/include/asm/uv/uv_bau.h
+++ 100531.linux-tip/arch/x86/include/asm/uv/uv_bau.h
@@ -75,7 +75,6 @@
#define DESC_STATUS_DESTINATION_TIMEOUT 2
#define DESC_STATUS_SOURCE_TIMEOUT 3
-#define TIMEOUT_DELAY 10
/*
* delay for 'plugged' timeout retries, in microseconds
*/
--
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