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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virtio_pcm.h (3836B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * virtio-snd: Virtio sound device
      4 * Copyright (C) 2021 OpenSynergy GmbH
      5 */
      6#ifndef VIRTIO_SND_PCM_H
      7#define VIRTIO_SND_PCM_H
      8
      9#include <linux/atomic.h>
     10#include <linux/virtio_config.h>
     11#include <sound/pcm.h>
     12
     13struct virtio_pcm;
     14struct virtio_pcm_msg;
     15
     16/**
     17 * struct virtio_pcm_substream - VirtIO PCM substream.
     18 * @snd: VirtIO sound device.
     19 * @nid: Function group node identifier.
     20 * @sid: Stream identifier.
     21 * @direction: Stream data flow direction (SNDRV_PCM_STREAM_XXX).
     22 * @features: Stream VirtIO feature bit map (1 << VIRTIO_SND_PCM_F_XXX).
     23 * @substream: Kernel ALSA substream.
     24 * @hw: Kernel ALSA substream hardware descriptor.
     25 * @elapsed_period: Kernel work to handle the elapsed period state.
     26 * @lock: Spinlock that protects fields shared by interrupt handlers and
     27 *        substream operators.
     28 * @buffer_bytes: Current buffer size in bytes.
     29 * @hw_ptr: Substream hardware pointer value in bytes [0 ... buffer_bytes).
     30 * @xfer_enabled: Data transfer state (0 - off, 1 - on).
     31 * @xfer_xrun: Data underflow/overflow state (0 - no xrun, 1 - xrun).
     32 * @stopped: True if the substream is stopped and must be released on the device
     33 *           side.
     34 * @suspended: True if the substream is suspended and must be reconfigured on
     35 *             the device side at resume.
     36 * @msgs: Allocated I/O messages.
     37 * @nmsgs: Number of allocated I/O messages.
     38 * @msg_last_enqueued: Index of the last I/O message added to the virtqueue.
     39 * @msg_count: Number of pending I/O messages in the virtqueue.
     40 * @msg_empty: Notify when msg_count is zero.
     41 */
     42struct virtio_pcm_substream {
     43	struct virtio_snd *snd;
     44	u32 nid;
     45	u32 sid;
     46	u32 direction;
     47	u32 features;
     48	struct snd_pcm_substream *substream;
     49	struct snd_pcm_hardware hw;
     50	struct work_struct elapsed_period;
     51	spinlock_t lock;
     52	size_t buffer_bytes;
     53	size_t hw_ptr;
     54	bool xfer_enabled;
     55	bool xfer_xrun;
     56	bool stopped;
     57	bool suspended;
     58	struct virtio_pcm_msg **msgs;
     59	unsigned int nmsgs;
     60	int msg_last_enqueued;
     61	unsigned int msg_count;
     62	wait_queue_head_t msg_empty;
     63};
     64
     65/**
     66 * struct virtio_pcm_stream - VirtIO PCM stream.
     67 * @substreams: VirtIO substreams belonging to the stream.
     68 * @nsubstreams: Number of substreams.
     69 * @chmaps: Kernel channel maps belonging to the stream.
     70 * @nchmaps: Number of channel maps.
     71 */
     72struct virtio_pcm_stream {
     73	struct virtio_pcm_substream **substreams;
     74	u32 nsubstreams;
     75	struct snd_pcm_chmap_elem *chmaps;
     76	u32 nchmaps;
     77};
     78
     79/**
     80 * struct virtio_pcm - VirtIO PCM device.
     81 * @list: VirtIO PCM list entry.
     82 * @nid: Function group node identifier.
     83 * @pcm: Kernel PCM device.
     84 * @streams: VirtIO PCM streams (playback and capture).
     85 */
     86struct virtio_pcm {
     87	struct list_head list;
     88	u32 nid;
     89	struct snd_pcm *pcm;
     90	struct virtio_pcm_stream streams[SNDRV_PCM_STREAM_LAST + 1];
     91};
     92
     93extern const struct snd_pcm_ops virtsnd_pcm_ops;
     94
     95int virtsnd_pcm_validate(struct virtio_device *vdev);
     96
     97int virtsnd_pcm_parse_cfg(struct virtio_snd *snd);
     98
     99int virtsnd_pcm_build_devs(struct virtio_snd *snd);
    100
    101void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event);
    102
    103void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue);
    104
    105void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue);
    106
    107struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid);
    108
    109struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid);
    110
    111struct virtio_snd_msg *
    112virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss,
    113			  unsigned int command, gfp_t gfp);
    114
    115int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss,
    116			  unsigned int periods, unsigned int period_bytes);
    117
    118void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss);
    119
    120int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss);
    121
    122unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss);
    123
    124#endif /* VIRTIO_SND_PCM_H */