>>On Mon, Apr 24, 2017 at 05:29:36PM +0530, Geetha sowjanya wrote:
>> From: Geetha <[email protected]>
>>
>> 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
>Hmm, what are you doing to unmap that much? Is this VFIO teardown? Do you
Yes. I see this issue while poweroff the guest with VFIO device attached (40G
Intel VF).
>have 7c6d90e2bb1a ("iommu/io-pgtable-arm: Fix iova_to_phys for block
>entries") applied?
Using 4.11-rc5 kernel and patch is in place.
Thanks,
Geetha.
Will
>>
>> Signed-off-by: Geetha <[email protected]>
>> ---
>> 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
>> -
________________________________
From: Will Deacon <[email protected]>
Sent: Monday, April 24, 2017 9:38:41 PM
To: Akula, Geethasowjanya
Cc: [email protected]; [email protected];
[email protected]; [email protected];
[email protected]; Goutham, Sunil; Akula, Geethasowjanya
Subject: Re: [PATCH] iommu/arm-smmu-v3: Increase SMMU CMD queue poll timeout
On Mon, Apr 24, 2017 at 05:29:36PM +0530, Geetha sowjanya wrote:
> From: Geetha <[email protected]>
>
> 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
Hmm, what are you doing to unmap that much? Is this VFIO teardown? Do you
have 7c6d90e2bb1a ("iommu/io-pgtable-arm: Fix iova_to_phys for block
entries") applied?
Will
>
> Signed-off-by: Geetha <[email protected]>
> ---
> 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
>
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