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From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@lst.de>, Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	Stafford Horne <shorne@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.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: Re: provide in-place uncached remapping for dma-direct v2
Date: Mon, 2 Mar 2020 16:05:12 +0000	[thread overview]
Message-ID: <4fe14c57-78d4-6590-a4c4-14fbe061238e@arm.com> (raw)
In-Reply-To: <20200224194446.690816-1-hch@lst.de>

On 24/02/2020 7:44 pm, Christoph Hellwig wrote:
> 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.
> 
> Changes since v1:
>   - share the arch hook for inline remap and uncached segment support
> 

For the whole series:

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

I think we might ultimately want to fiddle around a bit more in 
dma_direct_alloc_pages() to give ARCH_HAS_DMA_SET_UNCACHED clear 
precedence over DMA_DIRECT_REMAP if they have to coexist, but let's land 
these patches first as a solid foundation.

Thanks,
Robin.

      parent reply	other threads:[~2020-03-02 16:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 19:44 Christoph Hellwig
2020-02-24 19:44 ` [PATCH 1/5] dma-direct: remove the cached_kernel_address hook Christoph Hellwig
2020-02-24 19:44 ` [PATCH 2/5] dma-direct: consolidate the error handling in dma_direct_alloc_pages Christoph Hellwig
2020-02-24 19:44 ` [PATCH 3/5] dma-direct: make uncached_kernel_address more general Christoph Hellwig
2020-02-24 19:44 ` [PATCH 4/5] dma-direct: provide a arch_dma_clear_uncached hook Christoph Hellwig
2020-02-24 21:53   ` Ira Weiny
2020-02-24 21:56     ` Christoph Hellwig
2020-02-24 19:44 ` [PATCH 5/5] openrisc: use the generic in-place uncached DMA allocator Christoph Hellwig
2020-02-25 10:09   ` Stafford Horne
2020-03-02 16:05 ` Robin Murphy [this message]

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