Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
IronPort-SDR: 1/LZhrq/7GoyNXzB/i0oJ49yqDqcT3eLditczXWuT2TGU/4tmci5bG9iKnnRTAftYYktOjtW7Z
 jkt+MO5ROApJ7YMbNhrhPquSFlDiZC3E7DwvKms66HjHBuxTmuYXZGGMw6AiwJSLQL2zfnsVGy
 YfmJ2UaOSp+7Wc2rLag0K6HTm/ND6KCTKjg/zAKwLrWYiXvN0o9ZYczDHNhSRZI03v04lgbI4r
 gl2QP8uAltIb4enEHvzGHDhY7umEDjXu++z28W0gKr0WofvdrG58tlpORW+Onyr7rApF2E8yKL
 x+2ApQBeK0K6h3uSmIe+fldy
IronPort-SDR: rf9zdZSYllUoDZSjIGKlJyFrk3+jHCW0uMuhJDcO3oUablZz06zS5vUYxDAc1e5wHt0RVBa1Yj
 vpJC9lvyV0577zFg84pDpuJ4wLIPPVz9YQY5yIAdeGL7rU3pOU80+hl6B4jfSVaHG3H8svdDMg
 ROnzXWVSVLq7HPYqWwNVwVHbXwHziHw5B0DydW3hbiCAT+C+dnKVqqthxRyUKywWtqHTgHB8bb
 lrs3Rjkz9SwyIjaR4F6FZyLZSlm0I1/K9xL+82zj/gud4kvW0R7yiaiLVQ/XaOzNxTMue+7nE/
 /OQ=
From:   Atish Patra <atish.patra@wdc.com>
To:     linux-kernel@vger.kernel.org
Cc:     Atish Patra <atish.patra@wdc.com>,
        Jeremy Linton <jeremy.linton@arm.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Anup Patel <anup@brainfault.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "David S. Miller" <davem@davemloft.net>,
        devicetree@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ingo Molnar <mingo@kernel.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-riscv@lists.infradead.org,
        Mark Rutland <mark.rutland@arm.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Otto Sabart <ottosabart@seberm.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Richard Fontana <rfontana@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will.deacon@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        Russell King <linux@armlinux.org.uk>
Subject: [PATCH v7 0/7] Unify CPU topology across ARM & RISC-V 
Date:   Mon, 17 Jun 2019 11:59:13 -0700
Message-Id: <20190617185920.29581-1-atish.patra@wdc.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The cpu-map DT entry in ARM can describe the CPU topology in much better
way compared to other existing approaches. RISC-V can easily adopt this
binding to represent its 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 significant 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.

There was an opportunity to unify topology data structure for ARM32 done
by patch 3/4. But, I refrained from making any other changes as I am not
very well versed with original intention for some functions that
are present in arch_topology.c. I hope this patch series can be served
as a baseline for such changes in the future.

The patches have been tested for RISC-V and compile tested for ARM64,
ARM32 & x86.

From Jeremy,

"I applied these to 5.2rc2, along with my PPTT/MT change and verified the 
system & scheduler topology/etc on DAWN and ThunderX2 using ACPI on arm64.
They appear to be working correctly.

so for the series,
Tested-by: Jeremy Linton <jeremy.linton@arm.com>"

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/qemu/tree/riscv_topology_dt

HiFive Unleashed DT with topology node is available here.
https://github.com/atishp04/opensbi/tree/HiFive_unleashed_topology

It can be verified with OpenSBI with following additional compile time
option.

FW_PAYLOAD_FDT="unleashed_topology.dtb"

Changes from v6->v7
1. Added socket to HiFive Unleashed topology example.
2. Added Acked-by & Reviewed-by.

Changes from v5->v6
1. Added two more patches from Sudeep about maintainership of arch_topology.c
   and Kconfig update.
2. Added Tested-by & Reviewed-by
3. Fixed a nit (reordering of variables)

Changes from v4-v5
1. Removed the arch_topology.h header inclusion from topology.c and arch_topology.c
file. Added it in linux/topology.h.
2. core_id is set to -1 upon reset. Otherwise, ARM topology store function does not
work.

Changes from v3->v4
1. Get rid of ARM32 specific information in topology structure.
2. Remove redundant functions from ARM32 and use common code instead. 

Changes from v2->v3
1. Cover letter update with experiment DT for topology changes.
2. Added the patch for [2].

Changes from v1->v2
1. ARM32 can now use the common code as well.

Atish Patra (4):
dt-binding: cpu-topology: Move cpu-map to a common binding.
cpu-topology: Move cpu topology code to common code.
arm: Use common cpu_topology structure and functions.
RISC-V: Parse cpu topology during boot.

Sudeep Holla (3):
Documentation: DT: arm: add support for sockets defining package
boundaries
base: arch_topology: update Kconfig help description
MAINTAINERS: Add an entry for generic architecture topology

.../topology.txt => cpu/cpu-topology.txt}     | 136 ++++++--
MAINTAINERS                                   |   7 +
arch/arm/include/asm/topology.h               |  20 --
arch/arm/kernel/topology.c                    |  60 +---
arch/arm64/include/asm/topology.h             |  23 --
arch/arm64/kernel/topology.c                  | 303 +-----------------
arch/riscv/Kconfig                            |   1 +
arch/riscv/kernel/smpboot.c                   |   3 +
drivers/base/Kconfig                          |   2 +-
drivers/base/arch_topology.c                  | 298 +++++++++++++++++
include/linux/arch_topology.h                 |  26 ++
include/linux/topology.h                      |   1 +
12 files changed, 454 insertions(+), 426 deletions(-)
rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%)

--
2.21.0