forked from Minki/linux
234172f6bb
This fixes a cascade of regressions that originally started with
the addition of the ia64 port, but only got fatal once we removed
most uses of block layer bounce buffering in Linux 4.18.
The reason is that while the original i386/PAE code that was the first
architecture that supported > 4GB of memory without an iommu decided to
leave bounce buffering to the subsystems, which in those days just mean
block and networking as no one else consumer arbitrary userspace memory.
Later with ia64, x86_64 and other ports we assumed that either an iommu
or something that fakes it up ("software IOTLB" in beautiful Intel
speak) is present and that subsystems can rely on that for dealing with
addressing limitations in devices. Except that the ARM LPAE scheme
that added larger physical address to 32-bit ARM did not follow that
scheme and thus only worked by chance and only for block and networking
I/O directly to highmem.
Long story, short fix - add swiotlb support to arm when build for LPAE
platforms, which actuallys turns out to be pretty trivial with the
modern dma-direct / swiotlb code to fix the Linux 4.18-ish regression.
-----BEGIN PGP SIGNATURE-----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=D6Uy
-----END PGP SIGNATURE-----
Merge tag 'arm-swiotlb-5.3' of git://git.infradead.org/users/hch/dma-mapping
Pull arm swiotlb support from Christoph Hellwig:
"This fixes a cascade of regressions that originally started with the
addition of the ia64 port, but only got fatal once we removed most
uses of block layer bounce buffering in Linux 4.18.
The reason is that while the original i386/PAE code that was the first
architecture that supported > 4GB of memory without an iommu decided
to leave bounce buffering to the subsystems, which in those days just
mean block and networking as no one else consumed arbitrary userspace
memory.
Later with ia64, x86_64 and other ports we assumed that either an
iommu or something that fakes it up ("software IOTLB" in beautiful
Intel speak) is present and that subsystems can rely on that for
dealing with addressing limitations in devices. Except that the ARM
LPAE scheme that added larger physical address to 32-bit ARM did not
follow that scheme and thus only worked by chance and only for block
and networking I/O directly to highmem.
Long story, short fix - add swiotlb support to arm when build for LPAE
platforms, which actuallys turns out to be pretty trivial with the
modern dma-direct / swiotlb code to fix the Linux 4.18-ish regression"
* tag 'arm-swiotlb-5.3' of git://git.infradead.org/users/hch/dma-mapping:
arm: use swiotlb for bounce buffering on LPAE configs
dma-mapping: check pfn validity in dma_common_{mmap,get_sgtable}
|
||
|---|---|---|
| .. | ||
| coherent.c | ||
| contiguous.c | ||
| debug.c | ||
| direct.c | ||
| dummy.c | ||
| Kconfig | ||
| Makefile | ||
| mapping.c | ||
| remap.c | ||
| swiotlb.c | ||
| virt.c | ||