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| author | Logan Gunthorpe <logang@deltatee.com> | 2022-07-08 18:50:57 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2022-07-26 13:27:48 +0200 |
| commit | 159bf19270e80b5bc4b13aa88072dcb390b4d297 (patch) | |
| tree | 75717c2bb4987d1fa94fe913de87f7ab6460b5cb /kernel/dma | |
| parent | dma-direct: support PCI P2PDMA pages in dma-direct map_sg (diff) | |
| download | linux-159bf19270e80b5bc4b13aa88072dcb390b4d297.tar.xz linux-159bf19270e80b5bc4b13aa88072dcb390b4d297.zip | |
dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support
Add a flags member to the dma_map_ops structure with one flag to
indicate support for PCI P2PDMA.
Also, add a helper to check if a device supports PCI P2PDMA.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/mapping.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 746d46825d08..a9ce5d728231 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -723,6 +723,24 @@ int dma_supported(struct device *dev, u64 mask) } EXPORT_SYMBOL(dma_supported); +bool dma_pci_p2pdma_supported(struct device *dev) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + /* if ops is not set, dma direct will be used which supports P2PDMA */ + if (!ops) + return true; + + /* + * Note: dma_ops_bypass is not checked here because P2PDMA should + * not be used with dma mapping ops that do not have support even + * if the specific device is bypassing them. + */ + + return ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED; +} +EXPORT_SYMBOL_GPL(dma_pci_p2pdma_supported); + #ifdef CONFIG_ARCH_HAS_DMA_SET_MASK void arch_dma_set_mask(struct device *dev, u64 mask); #else |