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| author | Joerg Roedel <jroedel@suse.de> | 2019-02-07 12:59:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:26 +0100 |
| commit | 38c3a86a8226ac78b1fd10b4dd7912530bcd3c9c (patch) | |
| tree | ea0e394724c535b8bb94641c39ebe008ebdbdc56 /Documentation/DMA-API.txt | |
| parent | db8913b46d74dc10fd4a9063b840e695f33e3eb9 (diff) | |
| download | blackbird-obmc-linux-38c3a86a8226ac78b1fd10b4dd7912530bcd3c9c.tar.gz blackbird-obmc-linux-38c3a86a8226ac78b1fd10b4dd7912530bcd3c9c.zip | |
dma: Introduce dma_max_mapping_size()
commit 133d624b1cee16906134e92d5befb843b58bcf31 upstream.
The function returns the maximum size that can be mapped
using DMA-API functions. The patch also adds the
implementation for direct DMA and a new dma_map_ops pointer
so that other implementations can expose their limit.
Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/DMA-API.txt')
| -rw-r--r-- | Documentation/DMA-API.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index e133ccd60228..acfe3d0f78d1 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -195,6 +195,14 @@ Requesting the required mask does not alter the current mask. If you wish to take advantage of it, you should issue a dma_set_mask() call to set the mask to the value returned. +:: + + size_t + dma_direct_max_mapping_size(struct device *dev); + +Returns the maximum size of a mapping for the device. The size parameter +of the mapping functions like dma_map_single(), dma_map_page() and +others should not be larger than the returned value. Part Id - Streaming DMA mappings -------------------------------- |
