From: Geetha sowjanya <gakula-M3mlKVOIwJVv6pq1l3V1OdBPR1lH4CV8@public.gmane.org>
To: robin.murphy-5wv7dgnIgG8@public.gmane.org,
will.deacon-5wv7dgnIgG8@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Cc: catalin.marinas-5wv7dgnIgG8@public.gmane.org,
Sunil.Goutham-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Geetha <gakula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
Subject: [PATCH] iommu/arm-smmu-v3: Increase SMMU CMD queue poll timeout
Date: Mon, 24 Apr 2017 17:29:36 +0530 [thread overview]
Message-ID: <1493035176-3633-1-git-send-email-gakula@caviumnetworks.com> (raw)
From: Geetha <gakula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
When large memory is being unmapped, huge no of tlb invalidation cmds are
submitted followed by a SYNC command. This sometimes hits CMD queue full and
poll on queue drain is being timedout throwing error message 'CMD_SYNC timeout'.
Although there is no functional issue, error message confuses user. Hence increased
poll timeout to 500us
Signed-off-by: Geetha <gakula-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
drivers/iommu/arm-smmu-v3.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 591bb96..1dcd154 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -407,7 +407,7 @@
#define PRIQ_1_ADDR_MASK 0xfffffffffffffUL
/* High-level queue structures */
-#define ARM_SMMU_POLL_TIMEOUT_US 100
+#define ARM_SMMU_POLL_TIMEOUT_US 500
#define MSI_IOVA_BASE 0x8000000
#define MSI_IOVA_LENGTH 0x100000
--
1.9.1
next reply other threads:[~2017-04-24 11:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-24 11:59 Geetha sowjanya [this message]
[not found] ` <1493035176-3633-1-git-send-email-gakula-M3mlKVOIwJVv6pq1l3V1OdBPR1lH4CV8@public.gmane.org>
2017-04-24 16:08 ` [PATCH] iommu/arm-smmu-v3: Increase SMMU CMD queue poll timeout Will Deacon
[not found] ` <20170424160841.GS12323-5wv7dgnIgG8@public.gmane.org>
2017-04-24 16:46 ` Akula, Geethasowjanya
2017-04-24 16:56 ` Sunil Kovvuri
[not found] ` <CA+sq2CeyVm4pcAVME7OAFVxpOcSJc5CsP0vz3ypDkSxdx0SKnQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-04-24 17:05 ` Will Deacon
[not found] ` <20170424170518.GU12323-5wv7dgnIgG8@public.gmane.org>
2017-04-26 9:20 ` Sunil Kovvuri
2017-04-26 9:48 ` Will Deacon
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