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authorJianxiong Gao <jxgao@google.com>2021-02-01 21:30:15 +0300
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2021-02-20 18:13:26 +0300
commit36950f2da1ea4cb683be174f6f581e25b2d33e71 (patch)
treea943c6554cd4ca9eaa3a8f82045d14552d96c5ce /include/linux/device.h
parent66e8d3b8995c05cb1e17b120f52e0218bc534a49 (diff)
downloadlinux-36950f2da1ea4cb683be174f6f581e25b2d33e71.tar.xz
driver core: add a min_align_mask field to struct device_dma_parameters
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>
Diffstat (limited to 'include/linux/device.h')
-rw-r--r--include/linux/device.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h
index 1779f90eeb4c..7960bf516dd7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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;
};