path: root/sound/soc/sof/sof-audio.c

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2019 Intel Corporation
//
// Author: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
//

#include <linux/bitfield.h>
#include <trace/events/sof.h>
#include "sof-audio.h"
#include "ops.h"

static bool is_virtual_widget(struct snd_sof_dev *sdev, struct snd_soc_dapm_widget *widget,
			      const char *func)
{
	switch (widget->id) {
	case snd_soc_dapm_out_drv:
	case snd_soc_dapm_output:
	case snd_soc_dapm_input:
		dev_dbg(sdev->dev, "%s: %s is a virtual widget\n", func, widget->name);
		return true;
	default:
		return false;
	}
}

static void sof_reset_route_setup_status(struct snd_sof_dev *sdev, struct snd_sof_widget *widget)
{
	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
	struct snd_sof_route *sroute;

	list_for_each_entry(sroute, &sdev->route_list, list)
		if (sroute->src_widget == widget || sroute->sink_widget == widget) {
			if (sroute->setup && tplg_ops && tplg_ops->route_free)
				tplg_ops->route_free(sdev, sroute);

			sroute->setup = false;
		}
}

static int sof_widget_free_unlocked(struct snd_sof_dev *sdev,
				    struct snd_sof_widget *swidget)
{
	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
	struct snd_sof_pipeline *spipe = swidget->spipe;
	int err = 0;
	int ret;

	if (!swidget->private)
		return 0;

	trace_sof_widget_free(swidget);

	/* only free when use_count is 0 */
	if (--swidget->use_count)
		return 0;

	/* reset route setup status for all routes that contain this widget */
	sof_reset_route_setup_status(sdev, swidget);

	/* free DAI config and continue to free widget even if it fails */
	if (WIDGET_IS_DAI(swidget->id)) {
		struct snd_sof_dai_config_data data;
		unsigned int flags = SOF_DAI_CONFIG_FLAGS_HW_FREE;

		data.dai_data = DMA_CHAN_INVALID;

		if (tplg_ops && tplg_ops->dai_config) {
			err = tplg_ops->dai_config(sdev, swidget, flags, &data);
			if (err < 0)
				dev_err(sdev->dev, "failed to free config for widget %s\n",
					swidget->widget->name);
		}
	}

	/* continue to disable core even if IPC fails */
	if (tplg_ops && tplg_ops->widget_free) {
		ret = tplg_ops->widget_free(sdev, swidget);
		if (ret < 0 && !err)
			err = ret;
	}

	/*
	 * decrement ref count for cores associated with all modules in the pipeline and clear
	 * the complete flag
	 */
	if (swidget->id == snd_soc_dapm_scheduler) {
		int i;

		for_each_set_bit(i, &spipe->core_mask, sdev->num_cores) {
			ret = snd_sof_dsp_core_put(sdev, i);
			if (ret < 0) {
				dev_err(sdev->dev, "failed to disable target core: %d for pipeline %s\n",
					i, swidget->widget->name);
				if (!err)
					err = ret;
			}
		}
		swidget->spipe->complete = 0;
	}

	/*
	 * free the scheduler widget (same as pipe_widget) associated with the current swidget.
	 * skip for static pipelines
	 */
	if (swidget->spipe && swidget->dynamic_pipeline_widget &&
	    swidget->id != snd_soc_dapm_scheduler) {
		ret = sof_widget_free_unlocked(sdev, swidget->spipe->pipe_widget);
		if (ret < 0 && !err)
			err = ret;
	}

	if (!err)
		dev_dbg(sdev->dev, "widget %s freed\n", swidget->widget->name);

	return err;
}

int sof_widget_free(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
{
	int ret;

	mutex_lock(&swidget->setup_mutex);
	ret = sof_widget_free_unlocked(sdev, swidget);
	mutex_unlock(&swidget->setup_mutex);

	return ret;
}
EXPORT_SYMBOL(sof_widget_free);

static int sof_widget_setup_unlocked(struct snd_sof_dev *sdev,
				     struct snd_sof_widget *swidget)
{
	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
	struct snd_sof_pipeline *spipe = swidget->spipe;
	bool use_count_decremented = false;
	int ret;
	int i;

	/* skip if there is no private data */
	if (!swidget->private)
		return 0;

	trace_sof_widget_setup(swidget);

	/* widget already set up */
	if (++swidget->use_count > 1)
		return 0;

	/*
	 * The scheduler widget for a pipeline is not part of the connected DAPM
	 * widget list and it needs to be set up before the widgets in the pipeline
	 * are set up. The use_count for the scheduler widget is incremented for every
	 * widget in a given pipeline to ensure that it is freed only after the last
	 * widget in the pipeline is freed. Skip setting up scheduler widget for static pipelines.
	 */
	if (swidget->dynamic_pipeline_widget && swidget->id != snd_soc_dapm_scheduler) {
		if (!swidget->spipe || !swidget->spipe->pipe_widget) {
			dev_err(sdev->dev, "No pipeline set for %s\n", swidget->widget->name);
			ret = -EINVAL;
			goto use_count_dec;
		}

		ret = sof_widget_setup_unlocked(sdev, swidget->spipe->pipe_widget);
		if (ret < 0)
			goto use_count_dec;
	}

	/* update ref count for cores associated with all modules in the pipeline */
	if (swidget->id == snd_soc_dapm_scheduler) {
		for_each_set_bit(i,