Re: [PATCH 07/16] LoongArch: lib: General routines

[Jiaxun Yang]

在2024年6月16日六月 下午5:00，Heinrich Schuchardt写道：
[...]
> The "LoongArch Reference Manual" is available at:
>
> https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_cacop
>
> What irritates me in
> 2.1.7.1. Cache Coherency Maintenance of Instruction Cache
> is the word *can*:
>
> The Cache coherency maintenance between the instruction Cache and the
> data Cache within the processor core *can* be implemented as hardware
> maintenance.
>
> Maybe you have to consult the Chinese version.
>
> 处理器核内部指令 Cache 与数据 Cache 之间的缓存一致性维护可以实现为硬件维护
>
> The cache consistency maintenance between the instruction cache and data
> cache inside the processor core *can* be implemented as hardware
> maintenance.

Hi Heinrich,

Thanks for the investigation! Impressive effort on decrypting Chinese
semantics :-)

I had consulted Loongson folks, and they told me that all current hardware
implementation do have I/D cache coherency maintained by hardware, see
implementation[1] in kernel.

For dcache I'll implement it with cac_op.

Thanks
[1]: https://elixir.bootlin.com/linux/v6.9.5/source/arch/loongarch/mm/cache.c
>
> Best regards
>
> Heinrich
-- 
- Jiaxun