108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
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/* 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_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_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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