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/*-
* BSD LICENSE
*
* Copyright(c) 2017 6WIND S.A. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of 6WIND nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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);
#endif /* VFIO_PRESENT */
#endif /* _RTE_VFIO_H_ */
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