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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>
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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1
include/linux/device.h
View File

@ -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;
};

16
include/linux/dma-mapping.h
View File

@ -500,6 +500,22 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
return -EIO;
}
static inline unsigned int dma_get_min_align_mask(struct device *dev)
{
if (dev->dma_parms)
return dev->dma_parms->min_align_mask;
return 0;
}
static inline int dma_set_min_align_mask(struct device *dev,
unsigned int min_align_mask)
{
if (WARN_ON_ONCE(!dev->dma_parms))
return -EIO;
dev->dma_parms->min_align_mask = min_align_mask;
return 0;
}
static inline int dma_get_cache_alignment(void)
{
#ifdef ARCH_DMA_MINALIGN