1 /* SPDX-License-Identifier: GPL-2.0 */
3 * PCI Peer 2 Peer DMA support.
5 * Copyright (c) 2016-2018, Logan Gunthorpe
6 * Copyright (c) 2016-2017, Microsemi Corporation
7 * Copyright (c) 2017, Christoph Hellwig
8 * Copyright (c) 2018, Eideticom Inc.
11 #ifndef _LINUX_PCI_P2PDMA_H
12 #define _LINUX_PCI_P2PDMA_H
14 #include <linux/pci.h>
19 #ifdef CONFIG_PCI_P2PDMA
20 int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
22 int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
23 int num_clients, bool verbose);
24 bool pci_has_p2pmem(struct pci_dev *pdev);
25 struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients);
26 void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);
27 void pci_free_p2pmem(struct pci_dev *pdev, void *addr, size_t size);
28 pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, void *addr);
29 struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
30 unsigned int *nents, u32 length);
31 void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
32 void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
33 int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
34 int nents, enum dma_data_direction dir, unsigned long attrs);
35 int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
37 ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
39 #else /* CONFIG_PCI_P2PDMA */
40 static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar,
41 size_t size, u64 offset)
45 static inline int pci_p2pdma_distance_many(struct pci_dev *provider,
46 struct device **clients, int num_clients, bool verbose)
50 static inline bool pci_has_p2pmem(struct pci_dev *pdev)
54 static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
59 static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size)
63 static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr,
67 static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev,
72 static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
73 unsigned int *nents, u32 length)
77 static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
78 struct scatterlist *sgl)
81 static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
84 static inline int pci_p2pdma_map_sg_attrs(struct device *dev,
85 struct scatterlist *sg, int nents, enum dma_data_direction dir,
90 static inline int pci_p2pdma_enable_store(const char *page,
91 struct pci_dev **p2p_dev, bool *use_p2pdma)
96 static inline ssize_t pci_p2pdma_enable_show(char *page,
97 struct pci_dev *p2p_dev, bool use_p2pdma)
99 return sprintf(page, "none\n");
101 #endif /* CONFIG_PCI_P2PDMA */
104 static inline int pci_p2pdma_distance(struct pci_dev *provider,
105 struct device *client, bool verbose)
107 return pci_p2pdma_distance_many(provider, &client, 1, verbose);
110 static inline struct pci_dev *pci_p2pmem_find(struct device *client)
112 return pci_p2pmem_find_many(&client, 1);
115 static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg,
116 int nents, enum dma_data_direction dir)
118 return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0);
121 #endif /* _LINUX_PCI_P2P_H */