From: Robin Murphy <robin.murphy@arm.com>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>, Christoph Hellwig <hch@lst.de>
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
Subject: Re: [PATCH 0/7] MIPS DMA coherence fixes
Date: Tue, 21 Feb 2023 19:46:08 +0000 [thread overview]
Message-ID: <ed2d7750-786d-82a1-5e79-1f216a682b20@arm.com> (raw)
In-Reply-To: <A8AC22A0-E883-4D9B-A629-5A3721B976C5@flygoat.com>
On 2023-02-21 18:15, Jiaxun Yang wrote:
>
>
>> 2023年2月21日 17:54，Christoph Hellwig <hch@lst.de> 写道：
>>
>> Can you explain the motivation here? Also why riscv patches are at
>> the end of a mips fіxes series?
>
> Ah sorry for any confusion.
>
> So the main purpose of this patch is to fix MIPS’s broken per-device coherency.
> To be more precise, we want to be able to control the default coherency for all devices probed from
> devicetree in early boot code.
Including the patch which actually does that would be helpful. As it is,
patches 4-7 here just appear to be moving an option around for no
practical effect.
Robin.
> To achieve that I decided to reuse dma_default_coherent to set default coherency for devicetree.
> And all later patches are severing for this purpose.
>
> Thanks
> - Jiaxun
next prev parent reply other threads:[~2023-02-21 19:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-21 12:46 Jiaxun Yang
2023-02-21 12:46 ` [PATCH 1/7] MIPS: Remove DMA_PERDEV_COHERENT Jiaxun Yang
2023-02-21 17:56 ` Christoph Hellwig
2023-02-21 12:46 ` [PATCH 2/7] MIPS: Always select ARCH_HAS_SYNC_DMA_FOR_CPU for noncoherent platforms Jiaxun Yang
2023-02-21 12:46 ` [PATCH 3/7] MIPS: c-r4k: Always install dma flush functions Jiaxun Yang
2023-02-21 12:46 ` [PATCH 4/7] dma-mapping: Always provide dma_default_coherent Jiaxun Yang
2023-02-21 17:58 ` Christoph Hellwig
2023-02-21 19:35 ` Robin Murphy
2023-02-21 19:56 ` Jiaxun Yang
2023-02-21 12:46 ` [PATCH 5/7] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT Jiaxun Yang
2023-02-21 17:58 ` Christoph Hellwig
2023-02-21 18:18 ` Jiaxun Yang
2023-02-21 12:46 ` [PATCH 6/7] riscv: Select ARCH_DMA_DEFAULT_COHERENT Jiaxun Yang
2023-02-21 18:14 ` Conor Dooley
2023-02-21 18:20 ` Jiaxun Yang
2023-02-21 12:46 ` [PATCH 7/7] of: address: Use dma_default_coherent to determine default coherency Jiaxun Yang
2023-02-21 17:54 ` [PATCH 0/7] MIPS DMA coherence fixes Christoph Hellwig
2023-02-21 18:15 ` Jiaxun Yang
2023-02-21 19:46 ` Robin Murphy [this message]
2023-02-21 19:55 ` Jiaxun Yang
2023-02-22 12:55 ` Robin Murphy
2023-02-22 13:04 ` Jiaxun Yang
2023-02-22 14:22 ` Robin Murphy
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