[PATCH/RFC 0/4] Fix RISC-V's arch-topology reporting

From: Conor Dooley <mail@conchuod.ie>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Palmer Dabbelt <palmer@rivosinc.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>
Cc: Daire McNamara <daire.mcnamara@microchip.com>,
	Conor Dooley <conor.dooley@microchip.com>,
	Niklas Cassel <niklas.cassel@wdc.com>,
	Damien Le Moal <damien.lemoal@opensource.wdc.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Zong Li <zong.li@sifive.com>,
	Emil Renner Berthing <kernel@esmil.dk>,
	Jonas Hahnfeld <hahnjo@hahnjo.de>, Guo Ren <guoren@kernel.org>,
	Anup Patel <anup@brainfault.org>,
	Atish Patra <atishp@atishpatra.org>,
	Changbin Du <changbin.du@intel.com>,
	Heiko Stuebner <heiko@sntech.de>,
	Philipp Tomsich <philipp.tomsich@vrull.eu>,
	Rob Herring <robh@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Brice Goglin <Brice.Goglin@inria.fr>
Subject: [PATCH/RFC 0/4] Fix RISC-V's arch-topology reporting
Date: Thu,  7 Jul 2022 23:04:33 +0100	[thread overview]
Message-ID: <20220707220436.4105443-1-mail@conchuod.ie> (raw)

From: Conor Dooley <conor.dooley@microchip.com>

Hey all,
It's my first time messing around with arch/ code at all, let alone
more than one arch, so forgive me if I have screwed up how to do a
migration like this.

The goal here is the fix the incorrectly reported arch topology on
RISC-V which seems to have been broken since it was added.
cpu, package and thread IDs are all currently reported as -1, so tools
like lstopo think systems have multiple threads on the same core when
this is not true:
https://github.com/open-mpi/hwloc/issues/536

Because I want to backport that fix, I implemented store_cpu_topology
for RISC-V before migrating to the generic version which seems to have
just complicated things, but was Sudeep's preferred way of doing it.

Palmer, I have not marked the first patch as RFC because I would like
it to be taken as a fix for 5.19-rc(late) independently of the rest if
possible.

The rest of the series is RFC b/c I don't know what I am doing ;)

I only built tested for arm64, so hopefully it is not broken when used.

Thanks,
Conor.

Conor Dooley (4):
  riscv: arch-topology: fix default topology reporting
  arch-topology: add a default implementation of store_cpu_topology()
  riscv: arch-topology: move riscv to the generic store_cpu_topology()
  arm64: arch-topology move arm64 to the generic store_cpu_topology()

 arch/arm64/kernel/smp.c       | 16 ++++++++++++--
 arch/arm64/kernel/topology.c  | 40 -----------------------------------
 arch/riscv/Kconfig            |  2 +-
 arch/riscv/kernel/smpboot.c   |  4 +++-
 drivers/base/arch_topology.c  | 19 +++++++++++++++++
 include/linux/arch_topology.h |  1 +
 6 files changed, 38 insertions(+), 44 deletions(-)

base-commit: b6f1f2fa2bddd69ff46a190b8120bd440fd50563
-- 
2.37.0

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel