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PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg()

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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>
This commit is contained in:
Logan Gunthorpe
2019-08-12 11:30:43 -06:00
committed by Bjorn Helgaas
parent 2b9f4bb2a4
commit 7f73eac3a7
4 changed files with 38 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/linux/pci-p2pdma.h
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@@ -32,6 +32,8 @@ void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs);
void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs);
int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
bool *use_p2pdma);
ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
@@ -87,6 +89,11 @@ static inline int pci_p2pdma_map_sg_attrs(struct device *dev,
{
return 0;
}
static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev,
struct scatterlist *sg, int nents, enum dma_data_direction dir,
unsigned long attrs)
{
}
static inline int pci_p2pdma_enable_store(const char *page,
struct pci_dev **p2p_dev, bool *use_p2pdma)
{
@@ -118,4 +125,10 @@ static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg,
return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0);
}
static inline void pci_p2pdma_unmap_sg(struct device *dev,
struct scatterlist *sg, int nents, enum dma_data_direction dir)
{
pci_p2pdma_unmap_sg_attrs(dev, sg, nents, dir, 0);
}
#endif /* _LINUX_PCI_P2P_H */