linux-kernel - Re: [PATCHv7 0/7] System Cache support for GPU and required SMMU support

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Message-ID: <b4ec727f58cfffc6e5b941d1508a4212@codeaurora.org>
Date:   Mon, 09 Nov 2020 10:45:30 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...il.com>
Cc:     iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        freedreno@...ts.freedesktop.org,
        "Kristian H . Kristensen" <hoegsberg@...gle.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCHv7 0/7] System Cache support for GPU and required SMMU
 support

On 2020-10-30 14:53, Sai Prakash Ranjan wrote:
> Some hardware variants contain a system cache or the last level
> cache(llc). This cache is typically a large block which is shared
> by multiple clients on the SOC. GPU uses the system cache to cache
> both the GPU data buffers(like textures) as well the SMMU pagetables.
> This helps with improved render performance as well as lower power
> consumption by reducing the bus traffic to the system memory.
> 
> The system cache architecture allows the cache to be split into slices
> which then be used by multiple SOC clients. This patch series is an
> effort to enable and use two of those slices preallocated for the GPU,
> one for the GPU data buffers and another for the GPU SMMU hardware
> pagetables.
> 
> Patch 1 - Patch 5 adds system cache support in SMMU and GPU driver.
> Patch 6 and 7 are minor cleanups for arm-smmu impl.
> 
> Changes in v7:
>  * Squash Jordan's patch to support MMU500 targets
>  * Rebase on top of for-joerg/arm-smmu/updates and Jordan's short
> series for adreno-smmu impl
> 
> Changes in v6:
>  * Move table to arm-smmu-qcom (Robin)
> 
> Changes in v5:
>  * Drop cleanup of blank lines since it was intentional (Robin)
>  * Rebase again on top of msm-next-pgtables as it moves pretty fast
> 
> Changes in v4:
>  * Drop IOMMU_SYS_CACHE prot flag
>  * Rebase on top of
> https://gitlab.freedesktop.org/drm/msm/-/tree/msm-next-pgtables
> 
> Changes in v3:
>  * Fix domain attribute setting to before iommu_attach_device()
>  * Fix few code style and checkpatch warnings
>  * Rebase on top of Jordan's latest split pagetables and per-instance
>    pagetables support
> 
> Changes in v2:
>  * Addressed review comments and rebased on top of Jordan's split
>    pagetables series
> 
> Jordan Crouse (1):
>   drm/msm/a6xx: Add support for using system cache on MMU500 based
>     targets
> 
> Sai Prakash Ranjan (4):
>   iommu/io-pgtable-arm: Add support to use system cache
>   iommu/arm-smmu: Add domain attribute for system cache
>   iommu: arm-smmu-impl: Use table to list QCOM implementations
>   iommu: arm-smmu-impl: Add a space before open parenthesis
> 
> Sharat Masetty (2):
>   drm/msm: rearrange the gpu_rmw() function
>   drm/msm/a6xx: Add support for using system cache(LLC)
> 

Hi,

Gentle Ping!

Thanks,
Sai

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