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| author | Joerg Roedel <jroedel@suse.de> | 2019-02-07 12:59:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:26 +0100 |
| commit | 4e9f8e86d6c781a5098e46b175355f6109a46d72 (patch) | |
| tree | 9e1b9e5617d1bc78c4c6467cea5e44c28028fee1 /include/linux/swiotlb.h | |
| parent | a4eeaa9cc9dadd79369e91b9f8220c4aa0d77098 (diff) | |
| download | blackbird-obmc-linux-4e9f8e86d6c781a5098e46b175355f6109a46d72.tar.gz blackbird-obmc-linux-4e9f8e86d6c781a5098e46b175355f6109a46d72.zip | |
swiotlb: Add is_swiotlb_active() function
commit 492366f7b4237257ef50ca9c431a6a0d50225aca upstream.
This function will be used from dma_direct code to determine
the maximum segment size of a dma mapping.
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 'include/linux/swiotlb.h')
| -rw-r--r-- | include/linux/swiotlb.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index d3980aeed4a0..29bc3a203283 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -77,6 +77,7 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, void __init swiotlb_exit(void); unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); +bool is_swiotlb_active(void); #else #define swiotlb_force SWIOTLB_NO_FORCE static inline bool is_swiotlb_buffer(phys_addr_t paddr) @@ -100,6 +101,11 @@ static inline size_t swiotlb_max_mapping_size(struct device *dev) { return SIZE_MAX; } + +static inline bool is_swiotlb_active(void) +{ + return false; +} #endif /* CONFIG_SWIOTLB */ extern void swiotlb_print_info(void); |
