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| author | Logan Gunthorpe <logang@deltatee.com> | 2019-08-12 11:30:43 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-08-16 08:41:26 -0500 |
| commit | 7f73eac3a7137eabfb0c005c7ba55eb7994b9673 (patch) | |
| tree | 71b1700c9f04a1a35c9abdc59a4b7104dff03901 /drivers/pci/p2pdma.c | |
| parent | 2b9f4bb2a4fb77da4862f9ddf5209de2bcdaa0c0 (diff) | |
| download | lwn-7f73eac3a7137eabfb0c005c7ba55eb7994b9673.tar.gz lwn-7f73eac3a7137eabfb0c005c7ba55eb7994b9673.zip | |
PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg()
Add pci_p2pdma_unmap_sg() to the two places that call pci_p2pdma_map_sg().
This is a prep patch to introduce correct mappings for p2pdma transactions
that go through the root complex.
Link: https://lore.kernel.org/r/20190730163545.4915-10-logang@deltatee.com
Link: https://lore.kernel.org/r/20190812173048.9186-10-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/pci/p2pdma.c')
| -rw-r--r-- | drivers/pci/p2pdma.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 94fbacbcbbd0..1eec7a5ec27e 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -800,7 +800,8 @@ EXPORT_SYMBOL_GPL(pci_p2pmem_publish); * @dir: DMA direction * @attrs: DMA attributes passed to dma_map_sg() (if called) * - * Scatterlists mapped with this function should not be unmapped in any way. + * Scatterlists mapped with this function should be unmapped using + * pci_p2pdma_unmap_sg_attrs(). * * Returns the number of SG entries mapped or 0 on error. */ @@ -835,6 +836,21 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs); /** + * pci_p2pdma_unmap_sg - unmap a PCI peer-to-peer scatterlist that was + * mapped with pci_p2pdma_map_sg() + * @dev: device doing the DMA request + * @sg: scatter list to map + * @nents: number of elements returned by pci_p2pdma_map_sg() + * @dir: DMA direction + * @attrs: DMA attributes passed to dma_unmap_sg() (if called) + */ +void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, unsigned long attrs) +{ +} +EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs); + +/** * pci_p2pdma_enable_store - parse a configfs/sysfs attribute store * to enable p2pdma * @page: contents of the value to be stored |