diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-03-23 18:19:30 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-07-19 09:29:29 +0200 |
| commit | d35834c64820c7ef397f8a244061d4450720540e (patch) | |
| tree | 5a2df279a26c6175bfc9dbf9859c52468967aa70 /include/linux/device.h | |
| parent | 2f9237d4f6df49b74c51cdac555b0a9979d0c237 (diff) | |
dma-mapping: add a dma_ops_bypass flag to struct device
Several IOMMU drivers have a bypass mode where they can use a direct
mapping if the devices DMA mask is large enough. Add generic support
to the core dma-mapping code to do that to switch those drivers to
a common solution.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Diffstat (limited to 'include/linux/device.h')
| -rw-r--r-- | include/linux/device.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 4c4af98321eb..1f71acf37f78 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -523,6 +523,11 @@ struct dev_links_info { * sync_state() callback. * @dma_coherent: this particular device is dma coherent, even if the * architecture supports non-coherent devices. + * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the + * streaming DMA operations (->map_* / ->unmap_* / ->sync_*), + * and optionall (if the coherent mask is large enough) also + * for dma allocations. This flag is managed by the dma ops + * instance from ->dma_supported. * * At the lowest level, every device in a Linux system is represented by an * instance of struct device. The device structure contains the information @@ -623,6 +628,9 @@ struct device { defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) bool dma_coherent:1; #endif +#ifdef CONFIG_DMA_OPS_BYPASS + bool dma_ops_bypass : 1; +#endif }; static inline struct device *kobj_to_dev(struct kobject *kobj) |