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Subject: Re: [PATCH v4 0/3] Use dma_default_coherent for devicetree default
 coherency
From:   Jiaxun Yang <jiaxun.yang@flygoat.com>
In-Reply-To: <20230401091531.47412-1-jiaxun.yang@flygoat.com>
Date:   Thu, 6 Apr 2023 08:12:01 +0100
Cc:     "linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        mpe@ellerman.id.au, paul.walmsley@sifive.com, palmer@dabbelt.com,
        Rob Herring <robh+dt@kernel.org>, m.szyprowski@samsung.com,
        Robin Murphy <robin.murphy@arm.com>,
        linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
        iommu@lists.linux.dev
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Message-Id: <C51B954E-FA96-450D-BB4F-D8D9D1FFC525@flygoat.com>
References: <20230401091531.47412-1-jiaxun.yang@flygoat.com>
To:     Christoph Hellwig <hch@lst.de>
Precedence: bulk


> 2023=E5=B9=B44=E6=9C=881=E6=97=A5 10:15=EF=BC=8CJiaxun Yang =
<jiaxun.yang@flygoat.com> =E5=86=99=E9=81=93=EF=BC=9A
>=20
> Hi all,
>=20
> This series split out second half of my previous series
> "[PATCH 0/4] MIPS DMA coherence fixes".
>=20
> It intends to use dma_default_coherent to determine the default =
coherency of
> devicetree probed devices instead of hardcoding it with Kconfig =
options.
>=20
> For some MIPS systems, dma_default_coherent is determined with either
> bootloader or hardware registers in platform initilization code, and =
devicetree
> does not explicility specify the coherency of the device, so we need =
the ability
> to change the default coherency of devicetree probed devices.
>=20
> For other platforms that supports noncoherent, dma_default_coherent is =
a fixed
> value set by arch code. It's defaulted to false for most archs except =
RISC-V
> and powerpc in some cases.

Ping.

Is there any issue remain in this series?

Thanks
Jiaxun

>=20
> Thanks
> - Jiaxun
> ---
> v2:
>  - Add PATCH 1 to help with backporting
>  - Use Kconfig option to set dma_default_coherent=20
>=20
> v3:
>  - Style fixes
>  - Squash setting ARCH_DMA_DEFAULT_COHERENT into PATCH 4
>  - Setting ARCH_DMA_DEFAULT_COHERENT for PowerPC
>=20
> v4:
>  - Drop first patch
>=20
> Jiaxun Yang (3):
>  dma-mapping: Provide a fallback dma_default_coherent
>  dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
>  of: address: Always use dma_default_coherent for default coherency
>=20
> arch/powerpc/Kconfig        | 2 +-
> arch/riscv/Kconfig          | 2 +-
> drivers/of/Kconfig          | 4 ----
> drivers/of/address.c        | 2 +-
> include/linux/dma-map-ops.h | 2 ++
> kernel/dma/Kconfig          | 7 +++++++
> kernel/dma/mapping.c        | 6 +++++-
> 7 files changed, 17 insertions(+), 8 deletions(-)
>=20
> --=20
> 2.39.2 (Apple Git-143)
>=20