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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ivc.h (2682B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
      4 */
      5
      6#ifndef __TEGRA_IVC_H
      7
      8#include <linux/device.h>
      9#include <linux/dma-mapping.h>
     10#include <linux/types.h>
     11
     12struct tegra_ivc_header;
     13
     14struct tegra_ivc {
     15	struct device *peer;
     16
     17	struct {
     18		struct tegra_ivc_header *channel;
     19		unsigned int position;
     20		dma_addr_t phys;
     21	} rx, tx;
     22
     23	void (*notify)(struct tegra_ivc *ivc, void *data);
     24	void *notify_data;
     25
     26	unsigned int num_frames;
     27	size_t frame_size;
     28};
     29
     30/**
     31 * tegra_ivc_read_get_next_frame - Peek at the next frame to receive
     32 * @ivc		pointer of the IVC channel
     33 *
     34 * Peek at the next frame to be received, without removing it from
     35 * the queue.
     36 *
     37 * Returns a pointer to the frame, or an error encoded pointer.
     38 */
     39void *tegra_ivc_read_get_next_frame(struct tegra_ivc *ivc);
     40
     41/**
     42 * tegra_ivc_read_advance - Advance the read queue
     43 * @ivc		pointer of the IVC channel
     44 *
     45 * Advance the read queue
     46 *
     47 * Returns 0, or a negative error value if failed.
     48 */
     49int tegra_ivc_read_advance(struct tegra_ivc *ivc);
     50
     51/**
     52 * tegra_ivc_write_get_next_frame - Poke at the next frame to transmit
     53 * @ivc		pointer of the IVC channel
     54 *
     55 * Get access to the next frame.
     56 *
     57 * Returns a pointer to the frame, or an error encoded pointer.
     58 */
     59void *tegra_ivc_write_get_next_frame(struct tegra_ivc *ivc);
     60
     61/**
     62 * tegra_ivc_write_advance - Advance the write queue
     63 * @ivc		pointer of the IVC channel
     64 *
     65 * Advance the write queue
     66 *
     67 * Returns 0, or a negative error value if failed.
     68 */
     69int tegra_ivc_write_advance(struct tegra_ivc *ivc);
     70
     71/**
     72 * tegra_ivc_notified - handle internal messages
     73 * @ivc		pointer of the IVC channel
     74 *
     75 * This function must be called following every notification.
     76 *
     77 * Returns 0 if the channel is ready for communication, or -EAGAIN if a channel
     78 * reset is in progress.
     79 */
     80int tegra_ivc_notified(struct tegra_ivc *ivc);
     81
     82/**
     83 * tegra_ivc_reset - initiates a reset of the shared memory state
     84 * @ivc		pointer of the IVC channel
     85 *
     86 * This function must be called after a channel is reserved before it is used
     87 * for communication. The channel will be ready for use when a subsequent call
     88 * to notify the remote of the channel reset.
     89 */
     90void tegra_ivc_reset(struct tegra_ivc *ivc);
     91
     92size_t tegra_ivc_align(size_t size);
     93unsigned tegra_ivc_total_queue_size(unsigned queue_size);
     94int tegra_ivc_init(struct tegra_ivc *ivc, struct device *peer, void *rx,
     95		   dma_addr_t rx_phys, void *tx, dma_addr_t tx_phys,
     96		   unsigned int num_frames, size_t frame_size,
     97		   void (*notify)(struct tegra_ivc *ivc, void *data),
     98		   void *data);
     99void tegra_ivc_cleanup(struct tegra_ivc *ivc);
    100
    101#endif /* __TEGRA_IVC_H */