linux-kernel - Re: [PATCH] arm64: dts: allwinner: Add cache information to the SoC dtsi for H6

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Message-ID: <5773383.DvuYhMxLoT@jernej-laptop>
Date: Sun, 28 Apr 2024 18:21:28 +0200
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: linux-sunxi@...ts.linux.dev, Dragan Simic <dsimic@...jaro.org>
Cc: wens@...e.org, samuel@...lland.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH] arm64: dts: allwinner: Add cache information to the SoC dtsi for
 H6

Dne nedelja, 28. april 2024 ob 13:40:36 GMT +2 je Dragan Simic napisal(a):
> Add missing cache information to the Allwinner H6 SoC dtsi, to allow
> the userspace, which includes lscpu(1) that uses the virtual files provided
> by the kernel under the /sys/devices/system/cpu directory, to display the
> proper H6 cache information.
> 
> Adding the cache information to the H6 SoC dtsi also makes the following
> warning message in the kernel log go away:
> 
>   cacheinfo: Unable to detect cache hierarchy for CPU 0
> 
> The cache parameters for the H6 dtsi were obtained and partially derived
> by hand from the cache size and layout specifications found in the following
> datasheets and technical reference manuals:
> 
>   - Allwinner H6 V200 datasheet, version 1.1
>   - ARM Cortex-A53 revision r0p3 TRM, version E
> 
> For future reference, here's a brief summary of the documentation:
> 
>   - All caches employ the 64-byte cache line length
>   - Each Cortex-A53 core has 32 KB of L1 2-way, set-associative instruction
>     cache and 32 KB of L1 4-way, set-associative data cache
>   - The entire SoC has 512 KB of unified L2 16-way, set-associative cache
> 
> Signed-off-by: Dragan Simic <dsimic@...jaro.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej