diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2018-10-05 00:27:38 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-10-17 20:18:17 +0300 |
| commit | 2d7bc010f450d803db9fed1a25da6144ff6140d3 (patch) | |
| tree | d54ab047d59ef11976e6c0929e7df9eb89397e39 /include/linux/pci-p2pdma.h | |
| parent | 977196b8c5b20b901acb0042579e30d7fa55790a (diff) | |
| download | linux-2d7bc010f450d803db9fed1a25da6144ff6140d3.tar.xz | |
PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers
Users of the P2PDMA infrastructure will typically need a way for the user
to tell the kernel to use P2P resources. Typically this will be a simple
on/off boolean operation but sometimes it may be desirable for the user to
specify the exact device to use for the P2P operation.
Add new helpers for attributes which take a boolean or a PCI device. Any
boolean as accepted by strtobool() turn P2P on or off (such as 'y', 'n',
'1', '0', etc). Specifying a full PCI device name/BDF will select the
specific device.
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 'include/linux/pci-p2pdma.h')
| -rw-r--r-- | include/linux/pci-p2pdma.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index b6dfb6dc2e53..bca9bc3e5be7 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -32,6 +32,10 @@ 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(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir); +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, + bool use_p2pdma); #else /* CONFIG_PCI_P2PDMA */ static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset) @@ -82,6 +86,17 @@ static inline int pci_p2pdma_map_sg(struct device *dev, { return 0; } +static inline int pci_p2pdma_enable_store(const char *page, + struct pci_dev **p2p_dev, bool *use_p2pdma) +{ + *use_p2pdma = false; + return 0; +} +static inline ssize_t pci_p2pdma_enable_show(char *page, + struct pci_dev *p2p_dev, bool use_p2pdma) +{ + return sprintf(page, "none\n"); +} #endif /* CONFIG_PCI_P2PDMA */ |