driver core: add a min_align_mask field to struct device_dma_parameters

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Some devices rely on the address offset in a page to function
correctly (NVMe driver as an example). These devices may use
a different page size than the Linux kernel. The address offset
has to be preserved upon mapping, and in order to do so, we
need to record the page_offset_mask first.

Signed-off-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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Jianxiong Gao 2021-02-01 10:30:15 -08:00 • committed by Konrad Rzeszutek Wilk

parent 66e8d3b899

commit 36950f2da1

2 changed files with 17 additions and 0 deletions

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1

include/linux/device.h

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16

include/linux/dma-mapping.h

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