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From: Will Deacon <will@kernel.org>
To: Krishna Reddy <vdumpa@nvidia.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Yu-Huan Hsu <YHsu@nvidia.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	Alistair Popple <apopple@nvidia.com>,
	Sachin Nikam <Snikam@nvidia.com>,
	"fenghua.yu@intel.com" <fenghua.yu@intel.com>,
	Pritesh Raithatha <praithatha@nvidia.com>,
	Vikram Sethi <vsethi@nvidia.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	Jason Gunthorpe <jgg@nvidia.com>,
	"zhangfei.gao@linaro.org" <zhangfei.gao@linaro.org>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v10 10/13] iommu/arm-smmu-v3: Check for SVA features
Date: Wed, 9 Dec 2020 20:07:42 +0000	[thread overview]
Message-ID: <20201209200741.GA8992@willie-the-truck> (raw)
In-Reply-To: <BY5PR12MB376486BC4F0789F81F1E9963B3CC0@BY5PR12MB3764.namprd12.prod.outlook.com>

On Wed, Dec 09, 2020 at 07:49:09PM +0000, Krishna Reddy wrote:
> > > Why is BTM mandated for SVA? I couldn't find this requirement in 
> > > SMMU spec (Sorry if I missed it or this got discussed earlier). But 
> > > if performance is the
> > only concern here,
> > > is it better just to allow it with a warning rather than limiting 
> > > SMMUs without
> > BTM?
> >
> > It's a performance concern and requires to support multiple 
> > configurations, but the spec allows it. Are there SMMUs without BTM 
> > that need it?
> 
> The Tegra Next Generation SOC uses arm-smmu-v3, but it doesn't have support for BTM.
> Do you have plan to get your earlier patch to handle invalidate
> notifications into upstream sometime soon? 

Is that a limitation of the SMMU implementation, the interconnect or the
integration?

Will
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  reply	other threads:[~2020-12-09 20:07 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 10:18 [PATCH v10 00/13] iommu: Shared Virtual Addressing for SMMUv3 (PT sharing part) Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 01/13] mm: Define pasid in mm Jean-Philippe Brucker
2020-09-28 22:22   ` Will Deacon
2020-09-28 22:43     ` Fenghua Yu
2020-09-30  9:13       ` Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 02/13] iommu/ioasid: Add ioasid references Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 03/13] iommu/sva: Add PASID helpers Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 04/13] arm64: mm: Pin down ASIDs for sharing mm with devices Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 05/13] iommu/io-pgtable-arm: Move some definitions to a header Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 06/13] arm64: cpufeature: Export symbol read_sanitised_ftr_reg() Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 07/13] iommu/arm-smmu-v3: Move definitions to a header Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 08/13] iommu/arm-smmu-v3: Share process page tables Jean-Philippe Brucker
2020-09-18 10:18 ` [PATCH v10 09/13] iommu/arm-smmu-v3: Seize private ASID Jean-Philippe Brucker
2020-09-18 13:07   ` Jonathan Cameron
2020-09-18 10:18 ` [PATCH v10 10/13] iommu/arm-smmu-v3: Check for SVA features Jean-Philippe Brucker
2020-09-21  8:59   ` Shameerali Kolothum Thodi
2020-09-24 10:13     ` Jean-Philippe Brucker
2020-09-24 11:13       ` Shameerali Kolothum Thodi
2020-12-09 19:49         ` Krishna Reddy
2020-12-09 20:07           ` Will Deacon [this message]
2020-12-09 20:38             ` Krishna Reddy
2020-12-14  9:32           ` Jean-Philippe Brucker
2020-12-14 23:23             ` Krishna Reddy
2020-09-18 10:18 ` [PATCH v10 11/13] iommu/arm-smmu-v3: Add SVA device feature Jean-Philippe Brucker
2020-12-15  1:09   ` Krishna Reddy
2021-01-06 10:09     ` Jean-Philippe Brucker
2021-01-06 17:23       ` Krishna Reddy
2020-09-18 10:18 ` [PATCH v10 12/13] iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind() Jean-Philippe Brucker
2020-11-24 23:58   ` Jason Gunthorpe
2020-11-25  9:27     ` Jean-Philippe Brucker
2020-11-26  0:37       ` Jason Gunthorpe
2020-09-18 10:18 ` [PATCH v10 13/13] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Jean-Philippe Brucker
2020-09-18 13:15 ` [PATCH v10 00/13] iommu: Shared Virtual Addressing for SMMUv3 (PT sharing part) Jonathan Cameron
2020-09-28 16:47 ` Jean-Philippe Brucker
2020-09-28 17:23   ` Will Deacon
2020-09-28 22:39     ` Will Deacon
2020-09-30  9:12       ` Jean-Philippe Brucker

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