linux-kernel - Re: [PATCH v3 0/2] Add StarFive's JH8100 StarLink Cache Controller

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Date: Wed, 24 Apr 2024 02:59:54 -0700
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Joshua Yeong <joshua.yeong@...rfivetech.com>, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, conor@...nel.org, paul.walmsley@...ive.com, 
	palmer@...belt.com, aou@...s.berkeley.edu, leyfoon.tan@...rfivetech.com, 
	jeeheng.sia@...rfivetech.com
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 0/2] Add StarFive's JH8100 StarLink Cache Controller

Joshua Yeong wrote:
> StarFive's JH8100 StarLink Cache Controller flush/invalidates cache using non-
> conventional RISC-V Zicbom extension instructions. This driver provides the
> cache handling on StarFive RISC-V SoC.

Hi Joshua,

As far as I know you didn't tape out the JH8100 yet, and you seem to have
replaced the SiFive cache controller with your own implementation. Can you
exlain a bit more about why you didn't implement the perfectly good Zicbom
standard instead of adding yet another non-standard work-around like this?

/Emil

>
> Changes in v3:
> - Fix code syntax
> - Link to v2: https://lore.kernel.org/all/20240423072639.143450-1-joshua.yeong@starfivetech.com/
>
> Changes in v2:
> - Change patch title from 'Add StarFive's StarLink-500 Cache Controller'
> - Remove StarFive alternative from errata framework
> - Fixes warning from https://lore.kernel.org/oe-kbuild-all/202403151625.boKDjHGr-lkp@intel.com/
> - Flush completion through atomic timeout function
> - Link to v1: https://lore.kernel.org/lkml/20240314061205.26143-1-joshua.yeong@starfivetech.com/
>
> Joshua Yeong (2):
>   cache: Add StarFive StarLink cache management for StarFive JH8100
>   dt-bindings: cache: Add docs for StarFive Starlink cache controller
>
>  .../cache/starfive,jh8100-starlink-cache.yaml |  66 +++++++++
>  drivers/cache/Kconfig                         |   9 ++
>  drivers/cache/Makefile                        |   5 +-
>  drivers/cache/starfive_starlink_cache.c       | 135 ++++++++++++++++++
>  4 files changed, 213 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/cache/starfive,jh8100-starlink-cache.yaml
>  create mode 100644 drivers/cache/starfive_starlink_cache.c
>
> --
> 2.25.1
>
>
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