linux-kernel - Re: [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V

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Date:   Wed, 5 Dec 2018 10:53:01 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Atish Patra <atish.patra@....com>, linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Will Deacon <will.deacon@....com>,
        linux-riscv@...ts.infradead.org,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@....com>,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        Anup Patel <anup@...infault.org>,
        Ingo Molnar <mingo@...nel.org>, devicetree@...r.kernel.org,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "moderated list:ARM64 PORT AARCH64 ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V

On 11/29/2018 4:28 PM, Atish Patra wrote:
> The cpu-map DT entry in ARM64 can describe the CPU topology in
> much better way compared to other existing approaches. RISC-V can
> easily adopt this binding to represent it's own CPU topology.
> Thus, both cpu-map DT binding and topology parsing code can be
> moved to a common location so that RISC-V or any other
> architecture can leverage that.
> 
> The relevant discussion regarding unifying cpu topology can be
> found in [1].
> 
> arch_topology seems to be a perfect place to move the common
> code. I have not introduced any functional changes in the moved
> code. The only downside in this approach is that the capacity
> code will be executed for RISC-V as well. But, it will exit
> immediately after not able to find the appropriate DT node. If
> the overhead is considered too much, we can always compile out
> capacity related functions under a different config for the
> architectures that do not support them.
> 
> The patches have been tested for RISC-V and compile tested for
> ARM64 & x86.
> 
> The socket change[2] is also now part of this series.
> 
> [1] https://lkml.org/lkml/2018/11/6/19
> [2] https://lkml.org/lkml/2018/11/7/918
> 
> QEMU changes for RISC-V topology are available at
> 
> https://github.com/atishp04/riscv-qemu/tree/cpu_topo
> 
> Apologies for the previous patch series with incorrect title and
> was sent only to kernel mailing list due to a bug in my config.
> Please ignore that.
> 
> Atish Patra (3):
> dt-binding: cpu-topology: Move cpu-map to a common binding.
> cpu-topology: Move cpu topology code to common code.
> RISC-V: Parse cpu topology during boot.
> 
> Sudeep Holla (1):
> Documentation: DT: arm: add support for sockets defining package
> boundaries
> 
> .../{arm/topology.txt => cpu/cpu-topology.txt}     | 133 +++++++--
> arch/arm64/include/asm/topology.h                  |  22 --
> arch/arm64/kernel/topology.c                       | 303 +--------------------
> arch/riscv/Kconfig                                 |   1 +
> arch/riscv/kernel/smpboot.c                        |   3 +
> drivers/base/arch_topology.c                       | 294 ++++++++++++++++++++
> include/linux/arch_topology.h                      |  26 ++
> include/linux/topology.h                           |   1 +
> 8 files changed, 435 insertions(+), 348 deletions(-)
> rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%)
> 
> --
> 2.7.4
> 

Seems to test fine on QDF2400.

Tested-by: Jeffrey Hugo <jhugo@...eaurora.org>

I did see that git am complained about patch #2 -

patch:103: space before tab in indent.
                         };
patch:114: space before tab in indent.
         };
warning: 2 lines add whitespace errors.


-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.