linux-kernel - Re: [PATCH v9 3/5] iommu/arm-smmu: introduction of ACTLR for custom prefetcher settings

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Date: Fri, 9 Feb 2024 12:53:10 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org, 
	konrad.dybcio@...aro.org, jsnitsel@...hat.com, quic_bjorande@...cinc.com, 
	mani@...nel.org, quic_eberman@...cinc.com, robdclark@...omium.org, 
	u.kleine-koenig@...gutronix.de, robh@...nel.org, vladimir.oltean@....com, 
	quic_pkondeti@...cinc.com, quic_molvera@...cinc.com, 
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/5] iommu/arm-smmu: introduction of ACTLR for custom
 prefetcher settings

On Tue, 23 Jan 2024 at 16:46, Bibek Kumar Patro
<quic_bibekkum@...cinc.com> wrote:
>
> Currently in Qualcomm  SoCs the default prefetch is set to 1 which allows
> the TLB to fetch just the next page table. MMU-500 features ACTLR
> register which is implementation defined and is used for Qualcomm SoCs
> to have a custom prefetch setting enabling TLB to prefetch the next set
> of page tables accordingly allowing for faster translations.
>
> ACTLR value is unique for each SMR (Stream matching register) and stored
> in a pre-populated table. This value is set to the register during
> context bank initialisation.
>
> Signed-off-by: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 61 ++++++++++++++++++++++
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 16 +++++-
>  drivers/iommu/arm/arm-smmu/arm-smmu.c      |  5 +-
>  drivers/iommu/arm/arm-smmu/arm-smmu.h      |  5 ++
>  4 files changed, 84 insertions(+), 3 deletions(-)


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


-- 
With best wishes
Dmitry