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

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Message-Id: <1582175719-7401-1-git-send-email-yash.shah@sifive.com>
Date:   Thu, 20 Feb 2020 10:45:17 +0530
From:   Yash Shah <yash.shah@...ive.com>
To:     palmer@...belt.com, 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@...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@mail.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