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From: John Garry <john.garry@huawei.com>
To: Robin Murphy <robin.murphy@arm.com>, Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Ming Lei <ming.lei@redhat.com>,
	iommu@lists.linux-foundation.org, Will Deacon <will@kernel.org>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: arm-smmu-v3 high cpu usage for NVMe
Date: Tue, 24 Mar 2020 12:37:14 +0000
Message-ID: <9f1c719f-b876-66a1-2d3e-7787e1f1ed9f@huawei.com> (raw)
In-Reply-To: <10d5bcb3-e7c4-18f0-ede6-9fd8f0385254@arm.com>

On 24/03/2020 12:07, Robin Murphy wrote:
> On 2020-03-24 11:55 am, John Garry wrote:
>> On 24/03/2020 10:43, Marc Zyngier wrote:
>>> On Tue, 24 Mar 2020 09:18:10 +0000
>>> John Garry<john.garry@huawei.com>  wrote:
>>>
>>>> On 23/03/2020 09:16, Marc Zyngier wrote:
>>>>
>>>> + Julien, Mark
>>>>
>>>> Hi Marc,
>>>>
>>>>>>> Time to enable pseudo-NMIs in the PMUv3 driver...
>>>>>>>
>>>>>> Do you know if there is any plan for this?
>>>>> There was. Julien Thierry has a bunch of patches for that [1], but 
>>>>> they > needs
>>>>> reviving.
>>>>>
>>>> So those patches still apply cleanly (apart from the kvm patch, which
>>>> I can skip, I suppose) and build, so I can try this I figure. Is
>>>> there anything else which I should ensure or know about? Apart from
>>>> enable CONFIG_ARM64_PSUEDO_NMI.
>>> You need to make sure that your firmware sets SCR_EL3.FIQ to 1. My D05
>>> has it set to 0, preventing me from being able to use the feature
>>> (hint, nudge...;-).
>>
>> Yeah, apparently it's set on our D06CS board, but I just need to 
>> double check the FW version with our FW guy.
> 
> Hopefully you saw the help for CONFIG_ARM64_PSUEDO_NMI already, but 
> since it's not been called out:
> 
>        This high priority configuration for interrupts needs to be
>            explicitly enabled by setting the kernel parameter
>            "irqchip.gicv3_pseudo_nmi" to 1.

Yeah, I saw that by chance somewhere else previously.

> 
> FWIW I believe is is still on the plan for someone here to dust off the 
> PMU pNMI patches at some point.

Cool. Well I can try to experiment with what Julien had at v4 for now.

Cheers,
John
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Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 15:17 [PATCH v2 0/8] Sort out SMMUv3 ATC invalidation and locking Will Deacon
2019-08-21 15:17 ` [PATCH v2 1/8] iommu/arm-smmu-v3: Document ordering guarantees of command insertion Will Deacon
2019-08-21 15:17 ` [PATCH v2 2/8] iommu/arm-smmu-v3: Disable detection of ATS and PRI Will Deacon
2019-08-21 15:36   ` Robin Murphy
2019-08-21 15:17 ` [PATCH v2 3/8] iommu/arm-smmu-v3: Remove boolean bitfield for 'ats_enabled' flag Will Deacon
2019-08-21 15:17 ` [PATCH v2 4/8] iommu/arm-smmu-v3: Don't issue CMD_SYNC for zero-length invalidations Will Deacon
2019-08-21 15:17 ` [PATCH v2 5/8] iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters Will Deacon
2019-08-21 15:50   ` Robin Murphy
2019-08-21 15:17 ` [PATCH v2 6/8] iommu/arm-smmu-v3: Fix ATC invalidation ordering wrt main TLBs Will Deacon
2019-08-21 16:25   ` Robin Murphy
2019-08-21 15:17 ` [PATCH v2 7/8] iommu/arm-smmu-v3: Avoid locking on invalidation path when not using ATS Will Deacon
2019-08-22 12:36   ` Robin Murphy
2019-08-21 15:17 ` [PATCH v2 8/8] Revert "iommu/arm-smmu-v3: Disable detection of ATS and PRI" Will Deacon
2020-01-02 17:44 ` arm-smmu-v3 high cpu usage for NVMe John Garry
2020-03-18 20:53   ` Will Deacon
2020-03-19 12:54     ` John Garry
2020-03-19 18:43       ` Jean-Philippe Brucker
2020-03-20 10:41         ` John Garry
2020-03-20 11:18           ` Jean-Philippe Brucker
2020-03-20 16:20             ` John Garry
2020-03-20 16:33               ` Marc Zyngier
2020-03-23  9:03                 ` John Garry
2020-03-23  9:16                   ` Marc Zyngier
2020-03-24  9:18                     ` John Garry
2020-03-24 10:43                       ` Marc Zyngier
2020-03-24 11:55                         ` John Garry
2020-03-24 12:07                           ` Robin Murphy
2020-03-24 12:37                             ` John Garry [this message]
2020-03-25 15:31                               ` John Garry
2020-05-22 14:52           ` John Garry
2020-05-25  5:57             ` Song Bao Hua (Barry Song)
     [not found]     ` <482c00d5-8e6d-1484-820e-1e89851ad5aa@huawei.com>
2020-04-06 15:11       ` John Garry

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