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Current File : /usr/include/linux/fpga-dfl.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Header File for FPGA DFL User API
 *
 * Copyright (C) 2017-2018 Intel Corporation, Inc.
 *
 * Authors:
 *   Kang Luwei <[email protected]>
 *   Zhang Yi <[email protected]>
 *   Wu Hao <[email protected]>
 *   Xiao Guangrong <[email protected]>
 */

#ifndef _LINUX_FPGA_DFL_H
#define _LINUX_FPGA_DFL_H

#include <linux/types.h>
#include <linux/ioctl.h>

#define DFL_FPGA_API_VERSION 0

/*
 * The IOCTL interface for DFL based FPGA is designed for extensibility by
 * embedding the structure length (argsz) and flags into structures passed
 * between kernel and userspace. This design referenced the VFIO IOCTL
 * interface (include/uapi/linux/vfio.h).
 */

#define DFL_FPGA_MAGIC 0xB6

#define DFL_FPGA_BASE 0
#define DFL_PORT_BASE 0x40
#define DFL_FME_BASE 0x80

/* Common IOCTLs for both FME and AFU file descriptor */

/**
 * DFL_FPGA_GET_API_VERSION - _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 0)
 *
 * Report the version of the driver API.
 * Return: Driver API Version.
 */

#define DFL_FPGA_GET_API_VERSION	_IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 0)

/**
 * DFL_FPGA_CHECK_EXTENSION - _IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 1)
 *
 * Check whether an extension is supported.
 * Return: 0 if not supported, otherwise the extension is supported.
 */

#define DFL_FPGA_CHECK_EXTENSION	_IO(DFL_FPGA_MAGIC, DFL_FPGA_BASE + 1)

/* IOCTLs for AFU file descriptor */

/**
 * DFL_FPGA_PORT_RESET - _IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 0)
 *
 * Reset the FPGA Port and its AFU. No parameters are supported.
 * Userspace can do Port reset at any time, e.g. during DMA or PR. But
 * it should never cause any system level issue, only functional failure
 * (e.g. DMA or PR operation failure) and be recoverable from the failure.
 * Return: 0 on success, -errno of failure
 */

#define DFL_FPGA_PORT_RESET		_IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 0)

/**
 * DFL_FPGA_PORT_GET_INFO - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 1,
 *						struct dfl_fpga_port_info)
 *
 * Retrieve information about the fpga port.
 * Driver fills the info in provided struct dfl_fpga_port_info.
 * Return: 0 on success, -errno on failure.
 */
struct dfl_fpga_port_info {
	/* Input */
	__u32 argsz;		/* Structure length */
	/* Output */
	__u32 flags;		/* Zero for now */
	__u32 num_regions;	/* The number of supported regions */
	__u32 num_umsgs;	/* The number of allocated umsgs */
};

#define DFL_FPGA_PORT_GET_INFO		_IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 1)

/**
 * FPGA_PORT_GET_REGION_INFO - _IOWR(FPGA_MAGIC, PORT_BASE + 2,
 *					struct dfl_fpga_port_region_info)
 *
 * Retrieve information about a device memory region.
 * Caller provides struct dfl_fpga_port_region_info with index value set.
 * Driver returns the region info in other fields.
 * Return: 0 on success, -errno on failure.
 */
struct dfl_fpga_port_region_info {
	/* input */
	__u32 argsz;		/* Structure length */
	/* Output */
	__u32 flags;		/* Access permission */
#define DFL_PORT_REGION_READ	(1 << 0)	/* Region is readable */
#define DFL_PORT_REGION_WRITE	(1 << 1)	/* Region is writable */
#define DFL_PORT_REGION_MMAP	(1 << 2)	/* Can be mmaped to userspace */
	/* Input */
	__u32 index;		/* Region index */
#define DFL_PORT_REGION_INDEX_AFU	0	/* AFU */
#define DFL_PORT_REGION_INDEX_STP	1	/* Signal Tap */
	__u32 padding;
	/* Output */
	__u64 size;		/* Region size (bytes) */
	__u64 offset;		/* Region offset from start of device fd */
};

#define DFL_FPGA_PORT_GET_REGION_INFO	_IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 2)

/**
 * DFL_FPGA_PORT_DMA_MAP - _IOWR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 3,
 *						struct dfl_fpga_port_dma_map)
 *
 * Map the dma memory per user_addr and length which are provided by caller.
 * Driver fills the iova in provided struct afu_port_dma_map.
 * This interface only accepts page-size aligned user memory for dma mapping.
 * Return: 0 on success, -errno on failure.
 */
struct dfl_fpga_port_dma_map {
	/* Input */
	__u32 argsz;		/* Structure length */
	__u32 flags;		/* Zero for now */
	__u64 user_addr;        /* Process virtual address */
	__u64 length;           /* Length of mapping (bytes)*/
	/* Output */
	__u64 iova;             /* IO virtual address */
};

#define DFL_FPGA_PORT_DMA_MAP		_IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 3)

/**
 * DFL_FPGA_PORT_DMA_UNMAP - _IOW(FPGA_MAGIC, PORT_BASE + 4,
 *						struct dfl_fpga_port_dma_unmap)
 *
 * Unmap the dma memory per iova provided by caller.
 * Return: 0 on success, -errno on failure.
 */
struct dfl_fpga_port_dma_unmap {
	/* Input */
	__u32 argsz;		/* Structure length */
	__u32 flags;		/* Zero for now */
	__u64 iova;		/* IO virtual address */
};

#define DFL_FPGA_PORT_DMA_UNMAP		_IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 4)

/**
 * struct dfl_fpga_irq_set - the argument for DFL_FPGA_XXX_SET_IRQ ioctl.
 *
 * @start: Index of the first irq.
 * @count: The number of eventfd handler.
 * @evtfds: Eventfd handlers.
 */
struct dfl_fpga_irq_set {
	__u32 start;
	__u32 count;
	__s32 evtfds[];
};

/**
 * DFL_FPGA_PORT_ERR_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 5,
 *								__u32 num_irqs)
 *
 * Get the number of irqs supported by the fpga port error reporting private
 * feature. Currently hardware supports up to 1 irq.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_PORT_ERR_GET_IRQ_NUM	_IOR(DFL_FPGA_MAGIC,	\
					     DFL_PORT_BASE + 5, __u32)

/**
 * DFL_FPGA_PORT_ERR_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_PORT_BASE + 6,
 *						struct dfl_fpga_irq_set)
 *
 * Set fpga port error reporting interrupt trigger if evtfds[n] is valid.
 * Unset related interrupt trigger if evtfds[n] is a negative value.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_PORT_ERR_SET_IRQ	_IOW(DFL_FPGA_MAGIC,	\
					     DFL_PORT_BASE + 6,	\
					     struct dfl_fpga_irq_set)

/**
 * DFL_FPGA_PORT_UINT_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_PORT_BASE + 7,
 *								__u32 num_irqs)
 *
 * Get the number of irqs supported by the fpga AFU interrupt private
 * feature.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_PORT_UINT_GET_IRQ_NUM	_IOR(DFL_FPGA_MAGIC,	\
					     DFL_PORT_BASE + 7, __u32)

/**
 * DFL_FPGA_PORT_UINT_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_PORT_BASE + 8,
 *						struct dfl_fpga_irq_set)
 *
 * Set fpga AFU interrupt trigger if evtfds[n] is valid.
 * Unset related interrupt trigger if evtfds[n] is a negative value.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_PORT_UINT_SET_IRQ	_IOW(DFL_FPGA_MAGIC,	\
					     DFL_PORT_BASE + 8,	\
					     struct dfl_fpga_irq_set)

/* IOCTLs for FME file descriptor */

/**
 * DFL_FPGA_FME_PORT_PR - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 0,
 *						struct dfl_fpga_fme_port_pr)
 *
 * Driver does Partial Reconfiguration based on Port ID and Buffer (Image)
 * provided by caller.
 * Return: 0 on success, -errno on failure.
 * If DFL_FPGA_FME_PORT_PR returns -EIO, that indicates the HW has detected
 * some errors during PR, under this case, the user can fetch HW error info
 * from the status of FME's fpga manager.
 */

struct dfl_fpga_fme_port_pr {
	/* Input */
	__u32 argsz;		/* Structure length */
	__u32 flags;		/* Zero for now */
	__u32 port_id;
	__u32 buffer_size;
	__u64 buffer_address;	/* Userspace address to the buffer for PR */
};

#define DFL_FPGA_FME_PORT_PR	_IO(DFL_FPGA_MAGIC, DFL_FME_BASE + 0)

/**
 * DFL_FPGA_FME_PORT_RELEASE - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 1,
 *						int port_id)
 *
 * Driver releases the port per Port ID provided by caller.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_FME_PORT_RELEASE   _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 1, int)

/**
 * DFL_FPGA_FME_PORT_ASSIGN - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 2,
 *						int port_id)
 *
 * Driver assigns the port back per Port ID provided by caller.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_FME_PORT_ASSIGN     _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 2, int)

/**
 * DFL_FPGA_FME_ERR_GET_IRQ_NUM - _IOR(DFL_FPGA_MAGIC, DFL_FME_BASE + 3,
 *							__u32 num_irqs)
 *
 * Get the number of irqs supported by the fpga fme error reporting private
 * feature. Currently hardware supports up to 1 irq.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_FME_ERR_GET_IRQ_NUM	_IOR(DFL_FPGA_MAGIC,	\
					     DFL_FME_BASE + 3, __u32)

/**
 * DFL_FPGA_FME_ERR_SET_IRQ - _IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 4,
 *						struct dfl_fpga_irq_set)
 *
 * Set fpga fme error reporting interrupt trigger if evtfds[n] is valid.
 * Unset related interrupt trigger if evtfds[n] is a negative value.
 * Return: 0 on success, -errno on failure.
 */
#define DFL_FPGA_FME_ERR_SET_IRQ	_IOW(DFL_FPGA_MAGIC,	\
					     DFL_FME_BASE + 4,	\
					     struct dfl_fpga_irq_set)

#endif /* _LINUX_FPGA_DFL_H */

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LinuXploit