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/* SPDX-License-Identifier: GPL-2.0 / / * PCI Peer 2 Peer DMA support. * * Copyright (c) 2016-2018, Logan Gunthorpe * Copyright (c) 2016-2017, Microsemi Corporation * Copyright (c) 2017, Christoph Hellwig * Copyright (c) 2018, Eideticom Inc. / #ifndef _LINUX_PCI_P2PDMA_H #define _LINUX_PCI_P2PDMA_H #include <linux/pci.h> struct block_device; struct scatterlist; #ifdef CONFIG_PCI_P2PDMA int pci_p2pdma_add_resource(struct pci_dev pdev, int bar, size_t size, u64 offset); int pci_p2pdma_distance_many(struct pci_dev provider, struct device clients, int num_clients, bool verbose); bool pci_has_p2pmem(struct pci_dev pdev); struct pci_dev pci_p2pmem_find_many(struct device clients, int num_clients); void pci_alloc_p2pmem(struct pci_dev pdev, size_t size); void pci_free_p2pmem(struct pci_dev pdev, void addr, size_t size); pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev pdev, void addr); struct scatterlist pci_p2pmem_alloc_sgl(struct pci_dev pdev, unsigned int nents, u32 length); 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, 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) { return -EOPNOTSUPP; } static inline int pci_p2pdma_distance_many(struct pci_dev provider, struct device clients, int num_clients, bool verbose) { return -1; } static inline bool pci_has_p2pmem(struct pci_dev pdev) { return false; } static inline struct pci_dev pci_p2pmem_find_many(struct device clients, int num_clients) { return NULL; } static inline void pci_alloc_p2pmem(struct pci_dev pdev, size_t size) { return NULL; } static inline void pci_free_p2pmem(struct pci_dev pdev, void addr, size_t size) { } static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev pdev, void addr) { return 0; } static inline struct scatterlist pci_p2pmem_alloc_sgl(struct pci_dev pdev, unsigned int nents, u32 length) { return NULL; } static inline void pci_p2pmem_free_sgl(struct pci_dev pdev, struct scatterlist sgl) { } static inline void pci_p2pmem_publish(struct pci_dev pdev, bool publish) { } static inline int pci_p2pdma_map_sg_attrs(struct device dev, struct scatterlist sg, int nents, enum dma_data_direction dir, unsigned long attrs) { 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) { 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 / static inline int pci_p2pdma_distance(struct pci_dev provider, struct device client, bool verbose) { return pci_p2pdma_distance_many(provider, &client, 1, verbose); } static inline struct pci_dev pci_p2pmem_find(struct device client) { return pci_p2pmem_find_many(&client, 1); } static inline int pci_p2pdma_map_sg(struct device dev, struct scatterlist sg, int nents, enum dma_data_direction dir) { 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 */

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