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| author | Christoph Hellwig <hch@lst.de> | 2020-06-29 15:03:56 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-06-30 15:44:03 +0200 |
| commit | 3aa91625007807bfca4155df1867a5c924a08662 (patch) | |
| tree | 200b5d80ea2b377dcdc560056f1fc247dc18024f /include | |
| parent | Merge branch 'fix-sockmap' (diff) | |
| download | linux-3aa91625007807bfca4155df1867a5c924a08662.tar.xz linux-3aa91625007807bfca4155df1867a5c924a08662.zip | |
dma-mapping: Add a new dma_need_sync API
Add a new API to check if calls to dma_sync_single_for_{device,cpu} are
required for a given DMA streaming mapping.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200629130359.2690853-2-hch@lst.de
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-direct.h | 1 | ||||
| -rw-r--r-- | include/linux/dma-mapping.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index 136f984df0d9..8b006730687b 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -87,4 +87,5 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); int dma_direct_supported(struct device *dev, u64 mask); +bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr); #endif /* _LINUX_DMA_DIRECT_H */ diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 78f677cf45ab..a33ed3954ed4 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -461,6 +461,7 @@ int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); u64 dma_get_required_mask(struct device *dev); size_t dma_max_mapping_size(struct device *dev); +bool dma_need_sync(struct device *dev, dma_addr_t dma_addr); unsigned long dma_get_merge_boundary(struct device *dev); #else /* CONFIG_HAS_DMA */ static inline dma_addr_t dma_map_page_attrs(struct device *dev, @@ -571,6 +572,10 @@ static inline size_t dma_max_mapping_size(struct device *dev) { return 0; } +static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) +{ + return false; +} static inline unsigned long dma_get_merge_boundary(struct device *dev) { return 0; |