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From: Christoph Hellwig <hch@lst.de>
To: Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	openrisc@lists.librecores.org, iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: provide in-place uncached remapping for dma-direct
Date: Thu,  7 Nov 2019 18:40:33 +0100	[thread overview]
Message-ID: <20191107174035.13783-1-hch@lst.de> (raw)

Hi all,

this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme.  The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.

Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-arch@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	openrisc@lists.librecores.org, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: provide in-place uncached remapping for dma-direct
Date: Thu,  7 Nov 2019 18:40:33 +0100	[thread overview]
Message-ID: <20191107174035.13783-1-hch@lst.de> (raw)

Hi all,

this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme.  The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.

Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-arch@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	openrisc@lists.librecores.org, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: provide in-place uncached remapping for dma-direct
Date: Thu,  7 Nov 2019 18:40:33 +0100	[thread overview]
Message-ID: <20191107174035.13783-1-hch@lst.de> (raw)

Hi all,

this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme.  The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.

Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	linux-arch@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	openrisc@lists.librecores.org, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: provide in-place uncached remapping for dma-direct
Date: Thu,  7 Nov 2019 18:40:33 +0100	[thread overview]
Message-ID: <20191107174035.13783-1-hch@lst.de> (raw)

Hi all,

this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme.  The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.

Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: openrisc@lists.librecores.org
Subject: [OpenRISC] provide in-place uncached remapping for dma-direct
Date: Thu,  7 Nov 2019 18:40:33 +0100	[thread overview]
Message-ID: <20191107174035.13783-1-hch@lst.de> (raw)

Hi all,

this series provides support for remapping places uncached in-place in
the generic dma-direct code, and moves openrisc over from its own
in-place remapping scheme.  The arm64 folks also had interest in such
a scheme to avoid problems with speculating into cache aliases.

Also all architectures that always use small page mappings for the
kernel and have non-coherent DMA should look into enabling this
scheme, as it is much more efficient than the vmap remapping.

             reply	other threads:[~2019-11-07 17:41 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-07 17:40 Christoph Hellwig [this message]
2019-11-07 17:40 ` [OpenRISC] provide in-place uncached remapping for dma-direct Christoph Hellwig
2019-11-07 17:40 ` Christoph Hellwig
2019-11-07 17:40 ` Christoph Hellwig
2019-11-07 17:40 ` Christoph Hellwig
2019-11-07 17:40 ` [PATCH 1/2] dma-mapping: support setting memory uncached in place Christoph Hellwig
2019-11-07 17:40   ` [OpenRISC] " Christoph Hellwig
2019-11-07 17:40   ` Christoph Hellwig
2019-11-07 17:40   ` Christoph Hellwig
2019-11-07 17:40   ` Christoph Hellwig
2019-11-07 17:40 ` [PATCH 2/2] openrisc: use the generic in-place uncached DMA allocator Christoph Hellwig
2019-11-07 17:40   ` [OpenRISC] " Christoph Hellwig
2019-11-07 17:40   ` Christoph Hellwig
2019-11-07 17:40   ` Christoph Hellwig

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