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Date:   Fri, 20 Apr 2018 23:59:15 +0200
From:   =?UTF-8?B?TXlsw6huZQ==?= Josserand <mylene.josserand@bootlin.com>
To:     linux@armlinux.org.uk, maxime.ripard@bootlin.com, wens@csie.org,
        marc.zyngier@arm.com, mark.rutland@arm.com, robh+dt@kernel.org,
        horms@verge.net.au, geert@linux-m68k.org, magnus.damm@gmail.com
Cc:     linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org,
        clabbe.montjoie@gmail.com, quentin.schulz@bootlin.com,
        thomas.petazzoni@bootlin.com, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 00/11] Sunxi: Add SMP support on A83T
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In-Reply-To: <20180420211022.11759-1-mylene.josserand@bootlin.com>
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Hello,

On Fri, 20 Apr 2018 23:10:11 +0200
Mylène Josserand <mylene.josserand@bootlin.com> wrote:

> Hello everyone,
> 
> This is a V7 of my series that adds SMP support for Allwinner sun8i-a83t.
> Based on sunxi's tree, sunxi/for-next branch.
> Depends on a patch from Doug Berger that allows to include the "cpu-type"
> header on assembly files:
> https://lkml.org/lkml/2018/2/23/1263
> (applied on Broadcom's tree: https://github.com/Broadcom/stblinux/commits/soc/next)

And I forgot to say that I will have a look at the CPU0 hotplug but not
on this series.

Best regards,

Mylène

> 
> If you have any remarks/questions, let me know.
> Thank you in advance,
> Mylène
> 
> Changes from v6:
>     - Correct the commit log on patch 07 according to Sergei Shtylyov's
>     review.
>     - Rename the field "is_sun8i" into "is_a83t".
>     - Add all Tested-by and Reviewed-by from previous version.
> 
> Changes from v5:
>     - Remove my patch 01 and use the patch of Doug Berger to be able to
>     include the cpu-type header on assembly files.
>     - Rename smp_init_cntvoff function into secure_cntvoff_init according
>     to Marc Zyngier's review.
>     - According to Chen-Yu and Maxime's reviews, remove the patch that was
>     moving structures. Instead of using an index to retrieve which
>     architecture we are having, use a global variable.
>     - Merge the 2 patches that move assembly code from C to assembly file.
>     - Use a sun8i field instead of sun9i to know on which architecture we
>     are using because many modifications/additions of the code are for
>     sun8i-a83t.
>     - Rework the patch "add is_sun8i field" to add only this field in this
>     patch. The part of the patch that was starting to handle the differences
>     between sun8i-a83t and sun9i-a80 is merged in the patch that adds the
>     support of sun8i-a83t.
>     - Add a new patch that refactor the shmobile code to use the new function
>     secure_cntvoff_init introduced in this series.
> 
> Changes from v4:
>     - Rebased my series according to new Chen-Yu series:
>        "ARM: sunxi: Clean and improvements for multi-cluster SMP"
>        https://lkml.org/lkml/2018/3/8/886
>     - Updated my series according to Marc Zyngier's reviews to add CNTVOFF
>     initialization's function into ARM's common part. Thanks to that, other
>     platforms such as Renesa can use this function.
>     - For boot CPU, create a new machine to handle the CNTVOFF initialization
>     using "init_early" callback.
> 
> Changes from v3:
>     - Take into account Maxime's reviews:
> 	- split the first patch into 4 new patches: add sun9i device tree
> 	parsing, rename some variables, add a83t support and finally,
> 	add hotplug support.
> 	- Move the code of previous patch 07 (to disable CPU0 disabling)
> 	into hotplug support patch (see patch 04)
> 	- Remove the patch that added PRCM register because it is already
> 	available. Because of that, update the device tree parsing to use
> 	"sun8i-a83t-r-ccu".
> 	- Use a variable to know which SoC we currently have
>     - Take into account Chen-Yu's reviews: create two iounmap functions
>     to release the resources of the device tree parsing.
>     - Take into account Marc's review: Update the code to initialize CNTVOFF
>     register. As there is already assembly code in the driver, I decided
>     to create an assembly file not to mix assembly and C code.
>     For that, I create 3 new patches: move the current assembly code that
>     handles the cluster cache enabling into a file, move the cpu_resume entry
>     in this file and finally, add a new assembly entry to initialize the timer
>     offset for boot CPU and secondary CPUs.
> 
> Changes from v2:
>     - Rebased my modifications according to new Chen Yu's patch series
>     that adds SMP support for sun9i-a80 (without MCPM).
>     - Split the device-tree patches into 3 patches for CPUCFG, R_CPUCFG
>     and PRCM registers for more visibility.
>     - The hotplug of CPU0 is currently not working (even after trying what
>     Allwinner's code is doing) so remove the possibility of disabling
>     this CPU. Created a new patch for it.
> 
> Changes from v1:
>     - Add Chen Yu's patch in my series (see path 01)
>     - Add new compatibles for prcm and cpucfg registers for sun8i-a83t.
>     Create two functions to separate the DT parsing of sun9i-a80 and
>     sun8i-a83t.
>     - Thanks to Maxime's review: order device tree's nodes according
>     to physical addresses, remove unused label and fix registers' sizes.
>     Update the commit log and commit title of my last patch (see
>     patch 05).
> 
> Mylène Josserand (11):
>   ARM: sunxi: smp: Move assembly code into a file
>   ARM: dts: sun8i: Add CPUCFG device node for A83T dtsi
>   ARM: dts: sun8i: Add R_CPUCFG device node for the A83T dtsi
>   ARM: dts: sun8i: a83t: Add CCI-400 node
>   ARM: smp: Add initialization of CNTVOFF
>   ARM: sunxi: Add initialization of CNTVOFF
>   ARM: sun9i: smp: Rename clusters's power-off
>   ARM: sun9i: smp: Add is_a83t field
>   ARM: sun8i: smp: Add support for A83T
>   ARM: dts: sun8i: Add enable-method for SMP support for the A83T SoC
>   ARM: shmobile: Convert file to use cntvoff
> 
>  arch/arm/boot/dts/sun8i-a83t.dtsi        |  59 ++++++++
>  arch/arm/common/Makefile                 |   1 +
>  arch/arm/common/secure_cntvoff.S         |  31 ++++
>  arch/arm/include/asm/secure_cntvoff.h    |   8 ++
>  arch/arm/mach-shmobile/common.h          |   1 -
>  arch/arm/mach-shmobile/headsmp-apmu.S    |  22 +--
>  arch/arm/mach-shmobile/setup-rcar-gen2.c |   3 +-
>  arch/arm/mach-sunxi/Kconfig              |   2 +-
>  arch/arm/mach-sunxi/Makefile             |   4 +-
>  arch/arm/mach-sunxi/headsmp.S            |  81 +++++++++++
>  arch/arm/mach-sunxi/mc_smp.c             | 239 +++++++++++++++++++------------
>  arch/arm/mach-sunxi/sunxi.c              |  20 ++-
>  12 files changed, 349 insertions(+), 122 deletions(-)
>  create mode 100644 arch/arm/common/secure_cntvoff.S
>  create mode 100644 arch/arm/include/asm/secure_cntvoff.h
>  create mode 100644 arch/arm/mach-sunxi/headsmp.S
>