netdev - Re: [PATCH 00/12] Enable networking support for StarFive JH7100 SoC

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Date:   Sat, 11 Feb 2023 11:11:38 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com,
        arnd@...db.de, prabhakar.csengg@...il.com
Subject: Re: [PATCH 00/12] Enable networking support for StarFive JH7100 SoC

Hey Cristian!

+CC Arnd, Prabhakar

On Sat, Feb 11, 2023 at 05:18:09AM +0200, Cristian Ciocaltea wrote:
> This patch series adds ethernet support for the StarFive JH7100 SoC and 
> makes it available for the StarFive VisionFive V1 and BeagleV Starlight 
> boards, although I could only validate on the former SBC.
> 
> The work is heavily based on the reference implementation [1] and requires 
> the non-coherent DMA support provided by Emil via the Sifive Composable 
> Cache controller.
> 
> Also note there is an overlap in "[PATCH 08/12] net: stmmac: Add glue layer 
> for StarFive JH7100 SoC" with the Yanhong Wang's upstreaming attempt [2]:
> "[PATCH v4 5/7] net: stmmac: Add glue layer for StarFive JH7110 SoCs". 
> 
> Since I cannot test the JH7110 SoC, I dropped the support for it from Emil's
> variant of the stmmac glue layer. Hence, we might need a bit of coordination
> in order to get this properly merged.

To be honest, that one is the least of your worries sequencing wise.
Anything doing non-coherent DMA on RISC-V that doesn't use instructions is
dependant on Prabhakar's series:
https://lore.kernel.org/linux-riscv/20230106185526.260163-1-prabhakar.mahadev-lad.rj@bp.renesas.com/#t
That's kinda stalled out though, waiting on Arnd to make some changes to
the cross-arch DMA code:
https://lore.kernel.org/linux-riscv/ea4cb121-97e9-4365-861a-b3635fd34721@app.fastmail.com/

I was talking to Emil about the non-coherent support at FOSDEM actually,
and I see no real reason not to bring the JH7100 non-coherent support in
if we are doing it for other SoCs.

So yeah, hopefully we shall get there at some point soonTM...

Sorry,
Conor.

> [1] https://github.com/starfive-tech/linux/commits/visionfive
> [2] https://lore.kernel.org/linux-riscv/20230118061701.30047-6-yanhong.wang@starfivetech.com/
> 
> Cristian Ciocaltea (7):
>   dt-bindings: riscv: sifive-ccache: Add compatible for StarFive JH7100
>     SoC
>   dt-bindings: riscv: sifive-ccache: Add 'uncached-offset' property
>   dt-bindings: net: Add StarFive JH7100 SoC
>   riscv: dts: starfive: Add dma-noncoherent for JH7100 SoC
>   riscv: dts: starfive: jh7100: Add ccache DT node
>   riscv: dts: starfive: jh7100: Add sysmain and gmac DT nodes
>   riscv: dts: starfive: jh7100-common: Setup pinmux and enable gmac
> 
> Emil Renner Berthing (5):
>   soc: sifive: ccache: Add StarFive JH7100 support
>   soc: sifive: ccache: Add non-coherent DMA handling
>   riscv: Implement non-coherent DMA support via SiFive cache flushing
>   dt-bindings: mfd: syscon: Add StarFive JH7100 sysmain compatible
>   net: stmmac: Add glue layer for StarFive JH7100 SoC
> 
>  .../devicetree/bindings/mfd/syscon.yaml       |   1 +
>  .../devicetree/bindings/net/snps,dwmac.yaml   |  15 +-
>  .../bindings/net/starfive,jh7100-dwmac.yaml   | 106 ++++++++++++
>  .../bindings/riscv/sifive,ccache0.yaml        |  33 +++-
>  MAINTAINERS                                   |   6 +
>  arch/riscv/Kconfig                            |   6 +-
>  .../boot/dts/starfive/jh7100-common.dtsi      |  78 +++++++++
>  arch/riscv/boot/dts/starfive/jh7100.dtsi      |  55 +++++++
>  arch/riscv/mm/dma-noncoherent.c               |  37 ++++-
>  drivers/net/ethernet/stmicro/stmmac/Kconfig   |  12 ++
>  drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
>  .../ethernet/stmicro/stmmac/dwmac-starfive.c  | 155 ++++++++++++++++++
>  drivers/soc/sifive/Kconfig                    |   1 +
>  drivers/soc/sifive/sifive_ccache.c            |  71 +++++++-
>  include/soc/sifive/sifive_ccache.h            |  21 +++
>  15 files changed, 587 insertions(+), 11 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/starfive,jh7100-dwmac.yaml
>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
> 
> -- 
> 2.39.1
> 

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