linux-kernel - RE: [PATCH v5 0/2] cacheinfo support to read no. of L2 cache ways enabled

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Date:   Fri, 13 Mar 2020 06:03:36 +0000
From:   Yash Shah <yash.shah@...ive.com>
To:     "palmer@...belt.com" <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
CC:     "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "anup@...infault.org" <anup@...infault.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "alexios.zavras@...el.com" <alexios.zavras@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "bp@...e.de" <bp@...e.de>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sachin Ghadi <sachin.ghadi@...ive.com>
Subject: RE: [PATCH v5 0/2] cacheinfo support to read no. of L2 cache ways
 enabled

Any comments or updates on this series?

- Yash

> -----Original Message-----
> From: Yash Shah <yash.shah@...ive.com>
> Sent: 20 February 2020 10:45
> To: palmer@...belt.com; Paul Walmsley ( Sifive)
> <paul.walmsley@...ive.com>
> Cc: aou@...s.berkeley.edu; anup@...infault.org;
> gregkh@...uxfoundation.org; alexios.zavras@...el.com; tglx@...utronix.de;
> bp@...e.de; linux-riscv@...ts.infradead.org; linux-kernel@...r.kernel.org;
> Sachin Ghadi <sachin.ghadi@...ive.com>; Yash Shah
> <yash.shah@...ive.com>
> Subject: [PATCH v5 0/2] cacheinfo support to read no. of L2 cache ways
> enabled
> 
> The patchset includes 2 patches. Patch 1 implements cache_get_priv_group
> which make use of a generic ops structure to return a private attribute group
> for custom cacheinfo. Patch 2 implements a private attribute named
> "number_of_ways_enabled" in the cacheinfo framework. Reading this
> attribute returns the number of L2 cache ways enabled at runtime,
> 
> This patchset is based on Linux v5.6-rc2 and tested on HiFive Unleashed
> board.
> 
> v5:
> - Since WayEnable is 8bits, mask out and return only the last 8 bit in
>   l2_largest_wayenabled()
> - Rebased on Linux v5.6-rc2
> 
> v4:
> - Rename "sifive_l2_largest_wayenabled" to "l2_largest_wayenabled" and
>   make it a static function
> 
> v3:
> - As per Anup Patel's suggestion[0], implement a new approach which uses
>   generic ops structure. Hence addition of patch 1 to this series and
>   corresponding changes to patch 2.
> - Dropped "riscv: dts: Add DT support for SiFive L2 cache controller"
>   patch since it is already merged
> - Rebased on Linux v5.5-rc6
> 
> Changes in v2:
> - Rebase the series on v5.5-rc3
> - Remove the reserved-memory node from DT
> 
> [0]: https://lore.kernel.org/linux-
> riscv/CAAhSdy0CXde5s_ya=4YvmA4UQ5f5gLU-
> Z_FaOr8LPni+s_615Q@...l.gmail.com/
> 
> Yash Shah (2):
>   riscv: cacheinfo: Implement cache_get_priv_group with a generic ops
>     structure
>   riscv: Add support to determine no. of L2 cache way enabled
> 
>  arch/riscv/include/asm/cacheinfo.h   | 15 ++++++++++++++
>  arch/riscv/kernel/cacheinfo.c        | 17 ++++++++++++++++
>  drivers/soc/sifive/sifive_l2_cache.c | 38
> ++++++++++++++++++++++++++++++++++++
>  3 files changed, 70 insertions(+)
>  create mode 100644 arch/riscv/include/asm/cacheinfo.h
> 
> --
> 2.7.4