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| author | Logan Gunthorpe <logang@deltatee.com> | 2021-06-10 10:06:08 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-06-10 18:01:41 -0500 |
| commit | 7e2faa1710c408712185bb6463eaa0ee4776350f (patch) | |
| tree | fc9785d7c11cf9832e64512c1376bad0bc4f5c53 /drivers/pci/p2pdma.c | |
| parent | cf201bfe8cdc9ba11c4f312945b908ed24c7b7b5 (diff) | |
| download | lwn-7e2faa1710c408712185bb6463eaa0ee4776350f.tar.gz lwn-7e2faa1710c408712185bb6463eaa0ee4776350f.zip | |
PCI/P2PDMA: Refactor pci_p2pdma_map_type()
All callers of pci_p2pdma_map_type() have a struct dev_pgmap and a struct
device (of the client doing the DMA transfer). Thus move the conversion to
struct pci_devs for the provider and client into this function.
Link: https://lore.kernel.org/r/20210610160609.28447-6-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/p2pdma.c')
| -rw-r--r-- | drivers/pci/p2pdma.c | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index c07c928e3952..0bb6792b828c 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -816,12 +816,20 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool publish) } EXPORT_SYMBOL_GPL(pci_p2pmem_publish); -static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct pci_dev *provider, - struct pci_dev *client) +static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev) { + struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; + struct pci_dev *client; + if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; + if (!dev_is_pci(dev)) + return PCI_P2PDMA_MAP_NOT_SUPPORTED; + + client = to_pci_dev(dev); + return xa_to_value(xa_load(&provider->p2pdma->map_types, map_types_idx(client))); } @@ -858,14 +866,8 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, { struct pci_p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(sg_page(sg)->pgmap); - struct pci_dev *client; - - if (WARN_ON_ONCE(!dev_is_pci(dev))) - return 0; - client = to_pci_dev(dev); - - switch (pci_p2pdma_map_type(p2p_pgmap->provider, client)) { + switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev)) { case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: return dma_map_sg_attrs(dev, sg, nents, dir, attrs); case PCI_P2PDMA_MAP_BUS_ADDR: @@ -889,17 +891,9 @@ EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs); void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { - struct pci_p2pdma_pagemap *p2p_pgmap = - to_p2p_pgmap(sg_page(sg)->pgmap); enum pci_p2pdma_map_type map_type; - struct pci_dev *client; - - if (WARN_ON_ONCE(!dev_is_pci(dev))) - return; - - client = to_pci_dev(dev); - map_type = pci_p2pdma_map_type(p2p_pgmap->provider, client); + map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev); if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) dma_unmap_sg_attrs(dev, sg, nents, dir, attrs); |