From: Christoph Hellwig <hch@lst.de>
To: 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>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: fix default dma_mmap_* pgprot
Date: Thu, 1 Aug 2019 17:21:17 +0300 [thread overview]
Message-ID: <20190801142118.21225-1-hch@lst.de> (raw)
Hi all,
As Shawn pointed out we've had issues with the dma mmap pgprots ever
since the dma_common_mmap helper was added beyong the initial
architectures - we default to uncached mappings, but for devices that
are DMA coherent, or if the DMA_ATTR_NON_CONSISTENT is set (and
supported) this can lead to aliasing of cache attributes. This patch
fixes that. My explanation of why this hasn't been much of an issue
is that the dma_mmap_ helpers aren't used widely and mostly just in
architecture specific drivers.
next reply other threads:[~2019-08-01 14:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 14:21 Christoph Hellwig [this message]
2019-08-01 14:21 ` [PATCH] dma-mapping: fix page attributes for dma_mmap_* Christoph Hellwig
2019-08-01 16:23 ` Will Deacon
2019-08-01 16:34 ` Christoph Hellwig
2019-08-01 16:44 ` Will Deacon
2019-08-02 8:14 ` Christoph Hellwig
2019-08-02 10:38 ` Will Deacon
2019-08-03 6:48 ` Christoph Hellwig
2019-08-06 16:08 ` Will Deacon
2019-08-06 16:45 ` Russell King - ARM Linux admin
2019-08-06 16:48 ` Russell King - ARM Linux admin
2019-08-07 6:14 ` Christoph Hellwig
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