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 v2
Date: Mon, 24 Feb 2020 11:44:40 -0800 [thread overview]
Message-ID: <20200224194446.690816-1-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.
Changes since v1:
- share the arch hook for inline remap and uncached segment support
next reply other threads:[~2020-02-24 19:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 19:44 Christoph Hellwig [this message]
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 ` provide in-place uncached remapping for dma-direct v2 Robin Murphy
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