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authorChristoph Hellwig <hch@lst.de>2020-09-01 14:34:33 +0300
committerChristoph Hellwig <hch@lst.de>2020-09-25 07:20:47 +0300
commitefa70f2fdc842e63a0a13223e0e83cedcc2117f1 (patch)
treeef21550627a0a50be9edf10c53542f9c59a61896 /include/linux/dma-direct.h
parent5a84292271402cffe0717bc58e2ad9a0c7977272 (diff)
downloadlinux-efa70f2fdc842e63a0a13223e0e83cedcc2117f1.tar.xz
dma-mapping: add a new dma_alloc_pages API
This API is the equivalent of alloc_pages, except that the returned memory is guaranteed to be DMA addressable by the passed in device. The implementation will also be used to provide a more sensible replacement for DMA_ATTR_NON_CONSISTENT flag. Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages as its backend. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> (MIPS part)
Diffstat (limited to 'include/linux/dma-direct.h')
-rw-r--r--include/linux/dma-direct.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 83f797e0cb78..38ed3b55034d 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -115,6 +115,11 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
+struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_direct_free_pages(struct device *dev, size_t size,
+ struct page *page, dma_addr_t dma_addr,
+ enum dma_data_direction dir);
int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);