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From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Christoph Hellwig <hch@lst.de>, iommu@lists.linux-foundation.org
Cc: Shawn Anastasio <shawn@anastas.io>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Paul Burton <paul.burton@mips.com>,
	James Hogan <jhogan@kernel.org>,
	linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] MIPS: remove support for DMA_ATTR_WRITE_COMBINE
Date: Mon, 5 Aug 2019 11:06:24 +0300	[thread overview]
Message-ID: <f02604c5-dbea-e64e-cfb7-3a002b0da9a6@cogentembedded.com> (raw)
In-Reply-To: <20190805080145.5694-3-hch@lst.de>

Hello!

On 05.08.2019 11:01, Christoph Hellwig wrote:

> Mips uses the KSEG1 kernel memory segment do map dma coherent

     MIPS. s/do/to/?

> allocations for n

on-coherent devices as uncachable, and does not have

    Uncacheable?

> any kind of special support for DMA_ATTR_WRITE_COMBINE in the allocation
> path.  Thus supporting DMA_ATTR_WRITE_COMBINE in dma_mmap_attrs will
> lead to multiple mappings with different caching attributes.
> 
> Fixes: 8c172467be36 ("MIPS: Add implementation of dma_map_ops.mmap()")
> Signed-off-by: Christoph Hellwig <hch@lst.de>
[...]

MBR, Sergei

  reply	other threads:[~2019-08-05  8:06 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-05  8:01 fix default dma_mmap_* pgprot v2 Christoph Hellwig
2019-08-05  8:01 ` [PATCH 1/2] dma-mapping: fix page attributes for dma_mmap_* Christoph Hellwig
2019-08-05  9:10   ` Catalin Marinas
     [not found]   ` <CAP_+7SzPdNCMKuuXMjHjpCzxsey2YWR_e6mTAWtNSZ6kKBvKFw@mail.gmail.com>
2019-08-06  2:55     ` Gavin Li
2019-08-06  5:12       ` Christoph Hellwig
2019-08-06 19:39   ` Shawn Anastasio
2019-08-07  6:04     ` Christoph Hellwig
2019-08-07 11:45       ` Shawn Anastasio
2019-08-05  8:01 ` [PATCH 2/2] MIPS: remove support for DMA_ATTR_WRITE_COMBINE Christoph Hellwig
2019-08-05  8:06   ` Sergei Shtylyov [this message]
2019-08-07  6:16 fix default dma_mmap_* pgprot v3 Christoph Hellwig
2019-08-07  6:16 ` [PATCH 2/2] MIPS: remove support for DMA_ATTR_WRITE_COMBINE Christoph Hellwig
2019-09-18 19:50   ` Maciej W. Rozycki

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