| From: |
| Christoph Hellwig <hch-AT-lst.de> |
| To: |
| Jonas Bonn <jonas-AT-southpole.se>, Stefan Kristiansson <stefan.kristiansson-AT-saunalahti.fi>, Stafford Horne <shorne-AT-gmail.com> |
| Subject: |
| provide in-place uncached remapping for dma-direct v2 |
| Date: |
| Mon, 24 Feb 2020 11:44:40 -0800 |
| Message-ID: |
| <20200224194446.690816-1-hch@lst.de> |
| Cc: |
| Marek Szyprowski <m.szyprowski-AT-samsung.com>, Robin Murphy <robin.murphy-AT-arm.com>, Will Deacon <will-AT-kernel.org>, Mark Rutland <mark.rutland-AT-arm.com>, openrisc-AT-lists.librecores.org, iommu-AT-lists.linux-foundation.org, linux-arm-kernel-AT-lists.infradead.org, linux-arch-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org |
| Archive-link: |
| Article |
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
