diff options
| author | Jianxiong Gao <jxgao@google.com> | 2021-04-29 17:33:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-07 11:04:32 +0200 |
| commit | 2e8b3b0b8e2d3b56a0b653980c62cbcb374ffedf (patch) | |
| tree | d48206e52493a632c49e755245aa96694594686a /include/linux | |
| parent | 6995512a472f3b57d2838dcae725c01ceb0bb4f5 (diff) | |
driver core: add a min_align_mask field to struct device_dma_parameters
commit: 36950f2da1ea4cb683be174f6f581e25b2d33e71
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/device.h | 1 | ||||
| -rw-r--r-- | include/linux/dma-mapping.h | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 2b39de35525a..75a24b32fee8 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; }; diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 956151052d45..a7d70cdee25e 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 |