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п    /* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
 */

#ifndef __TEGRA_IVC_H
#define __TEGRA_IVC_H

#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/iosys-map.h>
#include <linux/types.h>

struct tegra_ivc_header;

struct tegra_ivc {
	struct device *peer;

	struct {
		struct iosys_map map;
		unsigned int position;
		dma_addr_t phys;
	} rx, tx;

	void (*notify)(struct tegra_ivc *ivc, void *data);
	void *notify_data;

	unsigned int num_frames;
	size_t frame_size;
};

/**
 * tegra_ivc_read_get_next_frame - Peek at the next frame to receive
 * @ivc		pointer of the IVC channel
 *
 * Peek at the next frame to be received, without removing it from
 * the queue.
 *
 * Returns a pointer to the frame, or an error encoded pointer.
 */
int tegra_ivc_read_get_next_frame(struct tegra_ivc *ivc, struct iosys_map *map);

/**
 * tegra_ivc_read_advance - Advance the read queue
 * @ivc		pointer of the IVC channel
 *
 * Advance the read queue
 *
 * Returns 0, or a negative error value if failed.
 */
int tegra_ivc_read_advance(struct tegra_ivc *ivc);

/**
 * tegra_ivc_write_get_next_frame - Poke at the next frame to transmit
 * @ivc		pointer of the IVC channel
 *
 * Get access to the next frame.
 *
 * Returns a pointer to the frame, or an error encoded pointer.
 */
int tegra_ivc_write_get_next_frame(struct tegra_ivc *ivc, struct iosys_map *map);

/**
 * tegra_ivc_write_advance - Advance the write queue
 * @ivc		pointer of the IVC channel
 *
 * Advance the write queue
 *
 * Returns 0, or a negative error value if failed.
 */
int tegra_ivc_write_advance(struct tegra_ivc *ivc);

/**
 * tegra_ivc_notified - handle internal messages
 * @ivc		pointer of the IVC channel
 *
 * This function must be called following every notification.
 *
 * Returns 0 if the channel is ready for communication, or -EAGAIN if a channel
 * reset is in progress.
 */
int tegra_ivc_notified(struct tegra_ivc *ivc);

/**
 * tegra_ivc_reset - initiates a reset of the shared memory state
 * @ivc		pointer of the IVC channel
 *
 * This function must be called after a channel is reserved before it is used
 * for communication. The channel will be ready for use when a subsequent call
 * to notify the remote of the channel reset.
 */
void tegra_ivc_reset(struct tegra_ivc *ivc);

size_t tegra_ivc_align(size_t size);
unsigned tegra_ivc_total_queue_size(unsigned queue_size);
int tegra_ivc_init(struct tegra_ivc *ivc, struct device *peer, const struct iosys_map *rx,
		   dma_addr_t rx_phys, const struct iosys_map *tx, dma_addr_t tx_phys,
		   unsigned int num_frames, size_t frame_size,
		   void (*notify)(struct tegra_ivc *ivc, void *data),
		   void *data);
void tegra_ivc_cleanup(struct tegra_ivc *ivc);

#endif /* __TEGRA_IVC_H */
     €ГВѓ@БЕД Ѓ    /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * DMABUF Heaps Userspace API
 *
 * Copyright (C) 2011 Google, Inc.
 * Copyright (C) 2019 Linaro Ltd.
 */
#ifndef _UAPI_LINUX_DMABUF_POOL_H
#define _UAPI_LINUX_DMABUF_POOL_H

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

/**
 * DOC: DMABUF Heaps Userspace API
 */

/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)

/* Currently no heap flags */
#define DMA_HEAP_VALID_HEAP_FLAGS (0)

/**
 * struct dma_heap_allocation_data - metadata passed from userspace for
 *                                      allocations
 * @len:		size of the allocation
 * @fd:			will be populated with a fd which provides the
 *			handle to the allocated dma-buf
 * @fd_flags:		file descriptor flags used when allocating
 * @heap_flags:		flags passed to heap
 *
 * Provided by userspace as an argument to the ioctl
 */
struct dma_heap_allocation_data {
	__u64 len;
	__u32 fd;
	__u32 fd_flags;
	__u64 heap_flags;
};

#define DMA_HEAP_IOC_MAGIC		'H'

/**
 * DOC: DMA_HEAP_IOCTL_ALLOC - allocate memory from pool
 *
 * Takes a dma_heap_allocation_data struct and returns it with the fd field
 * populated with the dmab