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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2022-02-27 12:42:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-02-27 12:42:37 -0800 |
| commit | 98f3e84f8df66f1ac9d04b6d8093993c9bfd69e6 (patch) | |
| tree | 2b63116b52a5ba74ee2565b3f13454b300947777 /include | |
| parent | Merge tag 'pinctrl-v5-17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl (diff) | |
| parent | swiotlb: fix info leak with DMA_FROM_DEVICE (diff) | |
| download | wireguard-linux-98f3e84f8df66f1ac9d04b6d8093993c9bfd69e6.tar.xz wireguard-linux-98f3e84f8df66f1ac9d04b6d8093993c9bfd69e6.zip | |
Merge tag 'dma-mapping-5.17-1' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping fix from Christoph Hellwig:
- fix a swiotlb info leak (Halil Pasic)
* tag 'dma-mapping-5.17-1' of git://git.infradead.org/users/hch/dma-mapping:
swiotlb: fix info leak with DMA_FROM_DEVICE
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-mapping.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index dca2b1355bb1..6150d11a607e 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -62,6 +62,14 @@ #define DMA_ATTR_PRIVILEGED (1UL << 9) /* + * This is a hint to the DMA-mapping subsystem that the device is expected + * to overwrite the entire mapped size, thus the caller does not require any + * of the previous buffer contents to be preserved. This allows + * bounce-buffering implementations to optimise DMA_FROM_DEVICE transfers. + */ +#define DMA_ATTR_OVERWRITE (1UL << 10) + +/* * A dma_addr_t can hold any valid DMA or bus address for the platform. It can * be given to a device to use as a DMA source or target. It is specific to a * given device and there may be a translation between the CPU physical address |