cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pci-p2pdma.h (4049B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * PCI Peer 2 Peer DMA support.
      4 *
      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.
      9 */
     10
     11#ifndef _LINUX_PCI_P2PDMA_H
     12#define _LINUX_PCI_P2PDMA_H
     13
     14#include <linux/pci.h>
     15
     16struct block_device;
     17struct scatterlist;
     18
     19#ifdef CONFIG_PCI_P2PDMA
     20int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
     21		u64 offset);
     22int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
     23			     int num_clients, bool verbose);
     24bool pci_has_p2pmem(struct pci_dev *pdev);
     25struct pci_dev *pci_p2pmem_find_many(struct device **clients, int num_clients);
     26void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size);
     27void pci_free_p2pmem(struct pci_dev *pdev, void *addr, size_t size);
     28pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev, void *addr);
     29struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
     30					 unsigned int *nents, u32 length);
     31void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl);
     32void pci_p2pmem_publish(struct pci_dev *pdev, bool publish);
     33int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
     34		int nents, enum dma_data_direction dir, unsigned long attrs);
     35void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
     36		int nents, enum dma_data_direction dir, unsigned long attrs);
     37int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev,
     38			    bool *use_p2pdma);
     39ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev,
     40			       bool use_p2pdma);
     41#else /* CONFIG_PCI_P2PDMA */
     42static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar,
     43		size_t size, u64 offset)
     44{
     45	return -EOPNOTSUPP;
     46}
     47static inline int pci_p2pdma_distance_many(struct pci_dev *provider,
     48	struct device **clients, int num_clients, bool verbose)
     49{
     50	return -1;
     51}
     52static inline bool pci_has_p2pmem(struct pci_dev *pdev)
     53{
     54	return false;
     55}
     56static inline struct pci_dev *pci_p2pmem_find_many(struct device **clients,
     57						   int num_clients)
     58{
     59	return NULL;
     60}
     61static inline void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size)
     62{
     63	return NULL;
     64}
     65static inline void pci_free_p2pmem(struct pci_dev *pdev, void *addr,
     66		size_t size)
     67{
     68}
     69static inline pci_bus_addr_t pci_p2pmem_virt_to_bus(struct pci_dev *pdev,
     70						    void *addr)
     71{
     72	return 0;
     73}
     74static inline struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev,
     75		unsigned int *nents, u32 length)
     76{
     77	return NULL;
     78}
     79static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev,
     80		struct scatterlist *sgl)
     81{
     82}
     83static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish)
     84{
     85}
     86static inline int pci_p2pdma_map_sg_attrs(struct device *dev,
     87		struct scatterlist *sg, int nents, enum dma_data_direction dir,
     88		unsigned long attrs)
     89{
     90	return 0;
     91}
     92static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev,
     93		struct scatterlist *sg, int nents, enum dma_data_direction dir,
     94		unsigned long attrs)
     95{
     96}
     97static inline int pci_p2pdma_enable_store(const char *page,
     98		struct pci_dev **p2p_dev, bool *use_p2pdma)
     99{
    100	*use_p2pdma = false;
    101	return 0;
    102}
    103static inline ssize_t pci_p2pdma_enable_show(char *page,
    104		struct pci_dev *p2p_dev, bool use_p2pdma)
    105{
    106	return sprintf(page, "none\n");
    107}
    108#endif /* CONFIG_PCI_P2PDMA */
    109
    110
    111static inline int pci_p2pdma_distance(struct pci_dev *provider,
    112	struct device *client, bool verbose)
    113{
    114	return pci_p2pdma_distance_many(provider, &client, 1, verbose);
    115}
    116
    117static inline struct pci_dev *pci_p2pmem_find(struct device *client)
    118{
    119	return pci_p2pmem_find_many(&client, 1);
    120}
    121
    122static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg,
    123				    int nents, enum dma_data_direction dir)
    124{
    125	return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0);
    126}
    127
    128static inline void pci_p2pdma_unmap_sg(struct device *dev,
    129		struct scatterlist *sg, int nents, enum dma_data_direction dir)
    130{
    131	pci_p2pdma_unmap_sg_attrs(dev, sg, nents, dir, 0);
    132}
    133
    134#endif /* _LINUX_PCI_P2P_H */