[PATCH v2 0/2] ARM: implement cacheinfo support (for v7/v7m)

[Linus Walleij]

Hi Dmitry,

On Mon, Oct 14, 2024 at 3:55 PM Dmitry Baryshkov
<dmitry.baryshkov at linaro.org> wrote:

> Follow the ARM64 platform and implement simple cache information driver.
> As it reads data from CTR (ARMv6+) and CLIDR (ARMv7+) registers, it is
> limited to the ARMv7 / ARMv7M, providing simple fallback or just
> returning -EOPNOTSUPP in case of older platforms.
>
> In theory we should be able to skip CLIDR reading and assume that Dcache
> and Icache (or unified L1 cache) always exist if CTR is supported and
> returns sensible value. However I think this better be handled by the
> maintainers of corresponding platforms.
>
> Other than just providing information to the userspace, this patchset is
> required in order to implement L2 cache driver (and in the end CPU
> frequency scaling) on ARMv7-based Qualcomm devices.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>

I added my review tags to the v2 patches, can you put them
into Russell's patch tracker?

Yours,
Linus Walleij