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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>
This commit is contained in:
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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include/linux/device.h
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@@ -291,6 +291,7 @@ struct device_dma_parameters {
* sg limitations.
*/
unsigned int max_segment_size;
unsigned int min_align_mask;
unsigned long segment_boundary_mask;
};