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| author | Joerg Roedel <jroedel@suse.de> | 2019-02-07 12:59:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:26 +0100 |
| commit | a4eeaa9cc9dadd79369e91b9f8220c4aa0d77098 (patch) | |
| tree | 0a3f70d21189c29eab08855e9ae2f4ac633c9c5e /kernel | |
| parent | 38c3a86a8226ac78b1fd10b4dd7912530bcd3c9c (diff) | |
| download | blackbird-obmc-linux-a4eeaa9cc9dadd79369e91b9f8220c4aa0d77098.tar.gz blackbird-obmc-linux-a4eeaa9cc9dadd79369e91b9f8220c4aa0d77098.zip | |
swiotlb: Introduce swiotlb_max_mapping_size()
commit abe420bfae528c92bd8cc5ecb62dc95672b1fd6f upstream.
The function returns the maximum size that can be remapped
by the SWIOTLB implementation. This function will be later
exposed to users through the DMA-API.
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 'kernel')
| -rw-r--r-- | kernel/dma/swiotlb.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 1fb6fd68b9c7..9cb21259cb0b 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -662,3 +662,8 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask) { return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask; } + +size_t swiotlb_max_mapping_size(struct device *dev) +{ + return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE; +} |
