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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 6WIND S.A.
*/
#ifndef _RTE_VFIO_H_
#define _RTE_VFIO_H_
/*
* determine if VFIO is present on the system
*/
#if !defined(VFIO_PRESENT) && defined(RTE_EAL_VFIO)
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
#define VFIO_PRESENT
#endif /* kernel version >= 3.6.0 */
#endif /* RTE_EAL_VFIO */
#ifdef VFIO_PRESENT
#include <linux/vfio.h>
#define VFIO_DIR "/dev/vfio"
#define VFIO_CONTAINER_PATH "/dev/vfio/vfio"
#define VFIO_GROUP_FMT "/dev/vfio/%u"
#define VFIO_NOIOMMU_GROUP_FMT "/dev/vfio/noiommu-%u"
#define VFIO_GET_REGION_ADDR(x) ((uint64_t) x << 40ULL)
#define VFIO_GET_REGION_IDX(x) (x >> 40)
#define VFIO_NOIOMMU_MODE \
"/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
/**
* Setup vfio_cfg for the device identified by its address.
* It discovers the configured I/O MMU groups or sets a new one for the device.
* If a new groups is assigned, the DMA mapping is performed.
*
* This function is only relevant to linux and will return
* an error on BSD.
*
* @param sysfs_base
* sysfs path prefix.
*
* @param dev_addr
* device location.
*
* @param vfio_dev_fd
* VFIO fd.
*
* @param device_info
* Device information.
*
* @return
* 0 on success.
* <0 on failure.
* >1 if the device cannot be managed this way.
*/
int rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
int *vfio_dev_fd, struct vfio_device_info *device_info);
/**
* Release a device mapped to a VFIO-managed I/O MMU group.
*
* This function is only relevant to linux and will return
* an error on BSD.
*
* @param sysfs_base
* sysfs path prefix.
*
* @param dev_addr
* device location.
*
* @param fd
* VFIO fd.
*
* @return
* 0 on success.
* <0 on failure.
*/
int rte_vfio_release_device(const char *sysfs_base, const char *dev_addr, int fd);
/**
* Enable a VFIO-related kmod.
*
* This function is only relevant to linux and will return
* an error on BSD.
*
* @param modname
* kernel module name.
*
* @return
* 0 on success.
* <0 on failure.
*/
int rte_vfio_enable(const char *modname);
/**
* Check whether a VFIO-related kmod is enabled.
*
* This function is only relevant to linux and will return
* an error on BSD.
*
* @param modname
* kernel module name.
*
* @return
* !0 if true.
* 0 otherwise.
*/
int rte_vfio_is_enabled(const char *modname);
/**
* Whether VFIO NOIOMMU mode is enabled.
*
* This function is only relevant to linux and will return
* an error on BSD.
*
* @return
* !0 if true.
* 0 otherwise.
*/
int rte_vfio_noiommu_is_enabled(void);
/* remove group fd from internal VFIO group fd array */
int
rte_vfio_clear_group(int vfio_group_fd);
#endif /* VFIO_PRESENT */
#endif /* _RTE_VFIO_H_ */
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