forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.0 KiB
134 lines
4.0 KiB
/* 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 */
|
|
|