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2d7bc010f4
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>
114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* PCI Peer 2 Peer DMA support.
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*
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* Copyright (c) 2016-2018, Logan Gunthorpe
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* Copyright (c) 2016-2017, Microsemi Corporation
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* Copyright (c) 2017, Christoph Hellwig
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* Copyright (c) 2018, Eideticom Inc.
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*/
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#ifndef _LINUX_PCI_P2PDMA_H
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#define _LINUX_PCI_P2PDMA_H
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#include <linux/pci.h>
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struct block_device;
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struct scatterlist;
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#ifdef CONFIG_PCI_P2PDMA
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int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
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u64 offset);
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int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
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int num_clients, bool verbose);
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bool pci_has_p2pmem(struct pci_dev *pdev);
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struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients);
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void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);
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void pci_free_p2pmem(struct pci_dev *pdev, void *addr, size_t size);
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pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, void *addr);
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struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
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unsigned int *nents, u32 length);
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void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
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void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
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int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
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bool *use_p2pdma);
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ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
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bool use_p2pdma);
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#else /* CONFIG_PCI_P2PDMA */
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static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar,
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size_t size, u64 offset)
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{
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return -EOPNOTSUPP;
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}
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static inline int pci_p2pdma_distance_many(struct pci_dev *provider,
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struct device **clients, int num_clients, bool verbose)
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{
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return -1;
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}
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static inline bool pci_has_p2pmem(struct pci_dev *pdev)
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{
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return false;
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}
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static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
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int num_clients)
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{
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return NULL;
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}
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static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size)
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{
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return NULL;
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}
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static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr,
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size_t size)
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{
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}
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static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev,
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void *addr)
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{
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return 0;
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}
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static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
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unsigned int *nents, u32 length)
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{
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return NULL;
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}
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static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
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struct scatterlist *sgl)
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{
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}
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static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
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{
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}
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static inline int pci_p2pdma_map_sg(struct device *dev,
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struct scatterlist *sg, int nents, enum dma_data_direction dir)
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{
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return 0;
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}
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static inline int pci_p2pdma_enable_store(const char *page,
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struct pci_dev **p2p_dev, bool *use_p2pdma)
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{
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*use_p2pdma = false;
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return 0;
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}
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static inline ssize_t pci_p2pdma_enable_show(char *page,
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struct pci_dev *p2p_dev, bool use_p2pdma)
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{
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return sprintf(page, "none\n");
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}
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#endif /* CONFIG_PCI_P2PDMA */
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static inline int pci_p2pdma_distance(struct pci_dev *provider,
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struct device *client, bool verbose)
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{
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return pci_p2pdma_distance_many(provider, &client, 1, verbose);
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}
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static inline struct pci_dev *pci_p2pmem_find(struct device *client)
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{
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return pci_p2pmem_find_many(&client, 1);
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}
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#endif /* _LINUX_PCI_P2P_H */
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