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authorLinus Torvalds <torvalds@linux-foundation.org>2022-02-27 12:42:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-02-27 12:42:37 -0800
commit98f3e84f8df66f1ac9d04b6d8093993c9bfd69e6 (patch)
tree2b63116b52a5ba74ee2565b3f13454b300947777 /include
parent6676ba2a6df6864a6b7b11f20166026e2201b627 (diff)
parentddbd89deb7d32b1fbb879f48d68fda1a8ac58e8e (diff)
downloadlinux-98f3e84f8df66f1ac9d04b6d8093993c9bfd69e6.tar.bz2
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.h8
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