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authorJianxiong Gao <jxgao@google.com>2021-02-01 10:30:15 -0800
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2021-02-20 10:13:26 -0500
commit36950f2da1ea4cb683be174f6f581e25b2d33e71 (patch)
treea943c6554cd4ca9eaa3a8f82045d14552d96c5ce /include/linux/dma-mapping.h
parent66e8d3b8995c05cb1e17b120f52e0218bc534a49 (diff)
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/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2e49996a8f39..9c26225754e7 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -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