intel/avs/path.c

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright(c) 2021 Intel Corporation. All rights reserved.
//
// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
//

#include <sound/intel-nhlt.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "avs.h"
#include "control.h"
#include "path.h"
#include "topology.h"

/* Must be called with adev->comp_list_mutex held. */
static struct avs_tplg *
avs_path_find_tplg(struct avs_dev *adev, const char *name)
{
	struct avs_soc_component *acomp;

	list_for_each_entry(acomp, &adev->comp_list, node)
		if (!strcmp(acomp->tplg->name, name))
			return acomp->tplg;
	return NULL;
}

static struct avs_path_module *
avs_path_find_module(struct avs_path_pipeline *ppl, u32 template_id)
{
	struct avs_path_module *mod;

	list_for_each_entry(mod, &ppl->mod_list, node)
		if (mod->template->id == template_id)
			return mod;
	return NULL;
}

static struct avs_path_pipeline *
avs_path_find_pipeline(struct avs_path *path, u32 template_id)
{
	struct avs_path_pipeline *ppl;

	list_for_each_entry(ppl, &path->ppl_list, node)
		if (ppl->template->id == template_id)
			return ppl;
	return NULL;
}

static struct avs_path *
avs_path_find_path(struct avs_dev *adev, const char *name, u32 template_id)
{
	struct avs_tplg_path_template *pos, *template = NULL;
	struct avs_tplg *tplg;
	struct avs_path *path;

	tplg = avs_path_find_tplg(adev, name);
	if (!tplg)
		return NULL;

	list_for_each_entry(pos, &tplg->path_tmpl_list, node) {
		if (pos->id == template_id) {
			template = pos;
			break;
		}
	}
	if (!template)
		return NULL;

	spin_lock(&adev->path_list_lock);
	/* Only one variant of given path template may be instantiated at a time. */
	list_for_each_entry(path, &adev->path_list, node) {
		if (path->template->owner == template) {
			spin_unlock(&adev->path_list_lock);
			return path;
		}
	}

	spin_unlock(&adev->path_list_lock);
	return NULL;
}

static bool avs_test_hw_params(struct snd_pcm_hw_params *params,
			       struct avs_audio_format *fmt)
{
	return (params_rate(params) == fmt->sampling_freq &&
		params_channels(params) == fmt->num_channels &&
		params_physical_width(params) == fmt->bit_depth &&
		params_width(params) == fmt->valid_bit_depth);
}

static struct avs_tplg_path *
avs_path_find_variant(struct avs_dev *adev,
		      struct avs_tplg_path_template *template,
		      struct snd_pcm_hw_params *fe_params,
		      struct snd_pcm_hw_params *be_params)
{
	struct avs_tplg_path *variant;

	list_for_each_entry(variant, &template->path_list, node) {
		dev_dbg(adev->dev, "check FE rate %d chn %d vbd %d bd %d\n",
			variant->fe_fmt->sampling_freq, variant->fe_fmt->num_channels,
			variant->fe_fmt->valid_bit_depth, variant->fe_fmt->bit_depth);
		dev_dbg(adev->dev, "check BE rate %d chn %d vbd %d bd %d\n",
			variant->be_fmt->sampling_freq, variant->be_fmt->num_channels,
			variant->be_fmt->valid_bit_depth, variant->be_fmt->bit_depth);

		if (variant->fe_fmt && avs_test_hw_params(fe_params, variant->fe_fmt) &&
		    variant->be_fmt && avs_test_hw_params(be_params, variant->be_fmt))
			return variant;
	}

	return NULL;
}

__maybe_unused
static bool avs_dma_type_is_host(u32 dma_type)
{
	return dma_type == AVS_DMA_HDA_HOST_OUTPUT ||
	       dma_type == AVS_DMA_HDA_HOST_INPUT;
}

__maybe_unused
static bool avs_dma_type_is_link(u32 dma_type)
{
	return !avs_dma_type_is_host(dma_type);
}

__maybe_unused
static bool avs_dma_type_is_output(u32 dma_type)
{
	return dma_type == AVS_DMA_HDA_HOST_OUTPUT ||
	       dma_type == AVS_DMA_HDA_LINK_OUTPUT ||
	       dma_type == AVS_DMA_I2S_LINK_OUTPUT;
}

__maybe_unused
static bool avs_dma_type_is_input(u32 dma_type)
{
	return !avs_dma_type_is_output(dma_type);
}

static int avs_copier_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct nhlt_acpi_table *nhlt = adev->nhlt;
	struct avs_tplg_module *t = mod->template;
	struct avs_copier_cfg *cfg;
	struct nhlt_specific_cfg *ep_blob;
	union avs_connector_node_id node_id = {0};
	size_t cfg_size, data_size = 0;
	void *data = NULL;
	u32 dma_type;
	int ret;

	dma_type = t->cfg_ext->copier.dma_type;
	node_id.dma_type = dma_type;

	switch (dma_type) {
		struct avs_audio_format *fmt;
		int direction;

	case AVS_DMA_I2S_LINK_OUTPUT:
	case AVS_DMA_I2S_LINK_INPUT:
		if (avs_dma_type_is_input(dma_type))
			direction = SNDRV_PCM_STREAM_CAPTURE;
		else
			direction = SNDRV_PCM_STREAM_PLAYBACK;

		if (t->cfg_ext->copier.blob_fmt)
			fmt = t->cfg_ext->copier.blob_fmt;
		else if (direction == SNDRV_PCM_STREAM_CAPTURE)
			fmt = t->in_fmt;
		else
			fmt = t->cfg_ext->copier.out_fmt;

		ep_blob = intel_nhlt_get_endpoint_blob(adev->dev,
			nhlt, t->cfg_ext->copier.vindex.i2s.instance,
			NHLT_LINK_SSP, fmt->valid_bit_depth, fmt->bit_depth,
			fmt->num_channels, fmt->sampling_freq, direction,
			NHLT_DEVICE_I2S);
		if (!ep_blob) {
			dev_err(adev->dev, "no I2S ep_blob found\n");
			return -ENOENT;
		}

		data = ep_blob->caps;
		data_size = ep_blob->size;
		/* I2S gateway's vindex is statically assigned in topology */
		node_id.vindex = t->cfg_ext->copier.vindex.val;

		break;

	case AVS_DMA_DMIC_LINK_INPUT:
		direction = SNDRV_PCM_STREAM_CAPTURE;

		if (t->cfg_ext->copier.blob_fmt)
			fmt = t->cfg_ext->copier.blob_fmt;
		else
			fmt = t->in_fmt;

		ep_blob = intel_nhlt_get_endpoint_blob(adev->dev, nhlt, 0,
				NHLT_LINK_DMIC, fmt->valid_bit_depth,
				fmt->bit_depth, fmt->num_channels,
				fmt->sampling_freq, direction, NHLT_DEVICE_DMIC);
		if (!ep_blob) {
			dev_err(adev->dev, "no DMIC ep_blob found\n");
			return -ENOENT;
		}

		data = ep_blob->caps;
		data_size = ep_blob->size;
		/* DMIC gateway's vindex is statically assigned in topology */
		node_id.vindex = t->cfg_ext->copier.vindex.val;

		break;

	case AVS_DMA_HDA_HOST_OUTPUT:
	case AVS_DMA_HDA_HOST_INPUT:
		/* HOST gateway's vindex is dynamically assigned with DMA id */
		node_id.vindex = mod->owner->owner->dma_id;
		break;

	case AVS_DMA_HDA_LINK_OUTPUT:
	case AVS_DMA_HDA_LINK_INPUT:
		node_id.vindex = t->cfg_ext->copier.vindex.val |
				 mod->owner->owner->dma_id;
		break;

	case INVALID_OBJECT_ID:
	default:
		node_id = INVALID_NODE_ID;
		break;
	}

	cfg_size = sizeof(*cfg) + data_size;
	/* Every config-BLOB contains gateway attributes. */
	if (data_size)
		cfg_size -= sizeof(cfg->gtw_cfg.config.attrs);

	cfg = kzalloc(cfg_size, GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	cfg->base.cpc = t->cfg_base->cpc;
	cfg->base.ibs = t->cfg_base->ibs;
	cfg->base.obs = t->cfg_base->obs;
	cfg->base.is_pages = t->cfg_base->is_pages;
	cfg->base.audio_fmt = *t->in_fmt;
	cfg->out_fmt = *t->cfg_ext->copier.out_fmt;
	cfg->feature_mask = t->cfg_ext->copier.feature_mask;
	cfg->gtw_cfg.node_id = node_id;
	cfg->gtw_cfg.dma_buffer_size = t->cfg_ext->copier.dma_buffer_size;
	/* config_length in DWORDs */
	cfg->gtw_cfg.config_length = DIV_ROUND_UP(data_size, 4);
	if (data)
		memcpy(&cfg->gtw_cfg.config, data, data_size);

	mod->gtw_attrs = cfg->gtw_cfg.config.attrs;

	ret = avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				  t->core_id, t->domain, cfg, cfg_size,
				  &mod->instance_id);
	kfree(cfg);
	return ret;
}

static struct avs_control_data *avs_get_module_control(struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_tplg_path_template *path_tmpl;
	struct snd_soc_dapm_widget *w;
	int i;

	path_tmpl = t->owner->owner->owner;
	w = path_tmpl->w;

	for (i = 0; i < w->num_kcontrols; i++) {
		struct avs_control_data *ctl_data;
		struct soc_mixer_control *mc;

		mc = (struct soc_mixer_control *)w->kcontrols[i]->private_value;
		ctl_data = (struct avs_control_data *)mc->dobj.private;
		if (ctl_data->id == t->ctl_id)
			return ctl_data;
	}

	return NULL;
}

static int avs_peakvol_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_control_data *ctl_data;
	struct avs_peakvol_cfg *cfg;
	int volume = S32_MAX;
	size_t size;
	int ret;

	ctl_data = avs_get_module_control(mod);
	if (ctl_data)
		volume = ctl_data->volume;

	/* As 2+ channels controls are unsupported, have a single block for all channels. */
	size = struct_size(cfg, vols, 1);
	cfg = kzalloc(size, GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	cfg->base.cpc = t->cfg_base->cpc;
	cfg->base.ibs = t->cfg_base->ibs;
	cfg->base.obs = t->cfg_base->obs;
	cfg->base.is_pages = t->cfg_base->is_pages;
	cfg->base.audio_fmt = *t->in_fmt;
	cfg->vols[0].target_volume = volume;
	cfg->vols[0].channel_id = AVS_ALL_CHANNELS_MASK;
	cfg->vols[0].curve_type = AVS_AUDIO_CURVE_NONE;
	cfg->vols[0].curve_duration = 0;

	ret = avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id, t->core_id,
				  t->domain, cfg, size, &mod->instance_id);

	kfree(cfg);
	return ret;
}

static int avs_updown_mix_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_updown_mixer_cfg cfg;
	int i;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.out_channel_config = t->cfg_ext->updown_mix.out_channel_config;
	cfg.coefficients_select = t->cfg_ext->updown_mix.coefficients_select;
	for (i = 0; i < AVS_CHANNELS_MAX; i++)
		cfg.coefficients[i] = t->cfg_ext->updown_mix.coefficients[i];
	cfg.channel_map = t->cfg_ext->updown_mix.channel_map;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_src_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_src_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.out_freq = t->cfg_ext->src.out_freq;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_asrc_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_asrc_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.out_freq = t->cfg_ext->asrc.out_freq;
	cfg.mode = t->cfg_ext->asrc.mode;
	cfg.disable_jitter_buffer = t->cfg_ext->asrc.disable_jitter_buffer;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_aec_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_aec_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.ref_fmt = *t->cfg_ext->aec.ref_fmt;
	cfg.out_fmt = *t->cfg_ext->aec.out_fmt;
	cfg.cpc_lp_mode = t->cfg_ext->aec.cpc_lp_mode;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_mux_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_mux_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.ref_fmt = *t->cfg_ext->mux.ref_fmt;
	cfg.out_fmt = *t->cfg_ext->mux.out_fmt;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_wov_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_wov_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.cpc_lp_mode = t->cfg_ext->wov.cpc_lp_mode;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_micsel_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_micsel_cfg cfg;

	cfg.base.cpc = t->cfg_base->cpc;
	cfg.base.ibs = t->cfg_base->ibs;
	cfg.base.obs = t->cfg_base->obs;
	cfg.base.is_pages = t->cfg_base->is_pages;
	cfg.base.audio_fmt = *t->in_fmt;
	cfg.out_fmt = *t->cfg_ext->micsel.out_fmt;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_modbase_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_modcfg_base cfg;

	cfg.cpc = t->cfg_base->cpc;
	cfg.ibs = t->cfg_base->ibs;
	cfg.obs = t->cfg_base->obs;
	cfg.is_pages = t->cfg_base->is_pages;
	cfg.audio_fmt = *t->in_fmt;

	return avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				   t->core_id, t->domain, &cfg, sizeof(cfg),
				   &mod->instance_id);
}

static int avs_modext_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	struct avs_tplg_module *t = mod->template;
	struct avs_tplg_modcfg_ext *tcfg = t->cfg_ext;
	struct avs_modcfg_ext *cfg;
	size_t cfg_size, num_pins;
	int ret, i;

	num_pins = tcfg->generic.num_input_pins + tcfg->generic.num_output_pins;
	cfg_size = sizeof(*cfg) + sizeof(*cfg->pin_fmts) * num_pins;

	cfg = kzalloc(cfg_size, GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	cfg->base.cpc = t->cfg_base->cpc;
	cfg->base.ibs = t->cfg_base->ibs;
	cfg->base.obs = t->cfg_base->obs;
	cfg->base.is_pages = t->cfg_base->is_pages;
	cfg->base.audio_fmt = *t->in_fmt;
	cfg->num_input_pins = tcfg->generic.num_input_pins;
	cfg->num_output_pins = tcfg->generic.num_output_pins;

	/* configure pin formats */
	for (i = 0; i < num_pins; i++) {
		struct avs_tplg_pin_format *tpin = &tcfg->generic.pin_fmts[i];
		struct avs_pin_format *pin = &cfg->pin_fmts[i];

		pin->pin_index = tpin->pin_index;
		pin->iobs = tpin->iobs;
		pin->audio_fmt = *tpin->fmt;
	}

	ret = avs_dsp_init_module(adev, mod->module_id, mod->owner->instance_id,
				  t->core_id, t->domain, cfg, cfg_size,
				  &mod->instance_id);
	kfree(cfg);
	return ret;
}

static int avs_probe_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	dev_err(adev->dev, "Probe module can't be instantiated by topology");
	return -EINVAL;
}

struct avs_module_create {
	guid_t *guid;
	int (*create)(struct avs_dev *adev, struct avs_path_module *mod);
};

static struct avs_module_create avs_module_create[] = {
	{ &AVS_MIXIN_MOD_UUID, avs_modbase_create },
	{ &AVS_MIXOUT_MOD_UUID, avs_modbase_create },
	{ &AVS_KPBUFF_MOD_UUID, avs_modbase_create },
	{ &AVS_COPIER_MOD_UUID, avs_copier_create },
	{ &AVS_PEAKVOL_MOD_UUID, avs_peakvol_create },
	{ &AVS_GAIN_MOD_UUID, avs_peakvol_create },
	{ &AVS_MICSEL_MOD_UUID, avs_micsel_create },
	{ &AVS_MUX_MOD_UUID, avs_mux_create },
	{ &AVS_UPDWMIX_MOD_UUID, avs_updown_mix_create },
	{ &AVS_SRCINTC_MOD_UUID, avs_src_create },
	{ &AVS_AEC_MOD_UUID, avs_aec_create },
	{ &AVS_ASRC_MOD_UUID, avs_asrc_create },
	{ &AVS_INTELWOV_MOD_UUID, avs_wov_create },
	{ &AVS_PROBE_MOD_UUID, avs_probe_create },
};

static int avs_path_module_type_create(struct avs_dev *adev, struct avs_path_module *mod)
{
	const guid_t *type = &mod->template->cfg_ext->type;

	for (int i = 0; i < ARRAY_SIZE(avs_module_create); i++)
		if (guid_equal(type, avs_module_create[i].guid))
			return avs_module_create[i].create(adev, mod);

	return avs_modext_create(adev, mod);
}

static void avs_path_module_free(struct avs_dev *adev, struct avs_path_module *mod)
{
	kfree(mod);
}

static struct avs_path_module *
avs_path_module_create(struct avs_dev *adev,
		       struct avs_path_pipeline *owner,
		       struct avs_tplg_module *template)
{
	struct avs_path_module *mod;
	int module_id, ret;

	module_id = avs_get_module_id(adev, &template->cfg_ext->type);
	if (module_id < 0)
		return ERR_PTR(module_id);

	mod = kzalloc(sizeof(*mod), GFP_KERNEL);
	if (!mod)
		return ERR_PTR(-ENOMEM);

	mod->template = template;
	mod->module_id = module_id;
	mod->owner = owner;
	INIT_LIST_HEAD(&mod->node);

	ret = avs_path_module_type_create(adev, mod);
	if (ret) {
		dev_err(adev->dev, "module-type create failed: %d\n", ret);
		kfree(mod);
		return ERR_PTR(ret);
	}

	return mod;
}

static int avs_path_binding_arm(struct avs_dev *adev, struct avs_path_binding *binding)
{
	struct avs_path_module *this_mod, *target_mod;
	struct avs_path_pipeline *target_ppl;
	struct avs_path *target_path;
	struct avs_tplg_binding *t;

	t = binding->template;
	this_mod = avs_path_find_module(binding->owner,
					t->mod_id);
	if (!this_mod) {
		dev_err(adev->dev, "path mod %d not found\n", t->mod_id);
		return -EINVAL;
	}

	/* update with target_tplg_name too */
	target_path = avs_path_find_path(adev, t->target_tplg_name,
					 t->target_path_tmpl_id);
	if (!target_path) {
		dev_err(adev->dev, "target path %s:%d not found\n",
			t->target_tplg_name, t->target_path_tmpl_id);
		return -EINVAL;
	}

	target_ppl = avs_path_find_pipeline(target_path,
					    t->target_ppl_id);
	if (!target_ppl) {
		dev_err(adev->dev, "target ppl %d not found\n", t->target_ppl_id);
		return -EINVAL;
	}

	target_mod = avs_path_find_module(target_ppl, t->target_mod_id);
	if (!target_mod) {
		dev_err(adev->dev, "target mod %d not found\n", t->target_mod_id);
		return -EINVAL;
	}

	if (t->is_sink) {
		binding->sink = this_mod;
		binding->sink_pin = t->mod_pin;
		binding->source = target_mod;
		binding->source_pin = t->target_mod_pin;
	} else {
		binding->sink = target_mod;
		binding->sink_pin = t->target_mod_pin;
		binding->source = this_mod;
		binding->source_pin = t->mod_pin;
	}

	return 0;
}

static void avs_path_binding_free(struct avs_dev *adev, struct avs_path_binding *binding)
{
	kfree(binding);
}

static struct avs_path_binding *avs_path_binding_create(struct avs_dev *adev,
							struct avs_path_pipeline *owner,
							struct avs_tplg_binding *t)
{
	struct avs_path_binding *binding;

	binding = kzalloc(sizeof(*binding), GFP_KERNEL);
	if (!binding)
		return ERR_PTR(-ENOMEM);

	binding->template = t;
	binding->owner = owner;
	INIT_LIST_HEAD(&binding->node);

	return binding;
}

static int avs_path_pipeline_arm(struct avs_dev *adev,
				 struct avs_path_pipeline *ppl)
{
	struct avs_path_module *mod;

	list_for_each_entry(mod, &ppl->mod_list, node) {
		struct avs_path_module *source, *sink;
		int ret;

		/*
		 * Only one module (so it's implicitly last) or it is the last
		 * one, either way we don't have next module to bind it to.
		 */
		if (mod == list_last_entry(&ppl->mod_list,
					   struct avs_path_module, node))
			break;

		/* bind current module to next module on list */
		source = mod;
		sink = list_next_entry(mod, node);
		if (!source || !sink)
			return -EINVAL;

		ret = avs_ipc_bind(adev, source->module_id, source->instance_id,
				   sink->module_id, sink->instance_id, 0, 0);
		if (ret)
			return AVS_IPC_RET(ret);
	}

	return 0;
}

static void avs_path_pipeline_free(struct avs_dev *adev,
				   struct avs_path_pipeline *ppl)
{
	struct avs_path_binding *binding, *bsave;
	struct avs_path_module *mod, *save;

	list_for_each_entry_safe(binding, bsave, &ppl->binding_list, node) {
		list_del(&binding->node);
		avs_path_binding_free(adev, binding);
	}

	avs_dsp_delete_pipeline(adev, ppl->instance_id);

	/* Unload resources occupied by owned modules */
	list_for_each_entry_safe(mod, save, &ppl->mod_list, node) {
		avs_dsp_delete_module(adev, mod->module_id, mod->instance_id,
				      mod->owner->instance_id,
				      mod->template->core_id);
		avs_path_module_free(adev, mod);
	}

	list_del(&ppl->node);
	kfree(ppl);
}

static struct avs_path_pipeline *
avs_path_pipeline_create(struct avs_dev *adev, struct avs_path *owner,
			 struct avs_tplg_pipeline *template)
{
	struct avs_path_pipeline *ppl;
	struct avs_tplg_pplcfg *cfg = template->cfg;
	struct avs_tplg_module *tmod;
	int ret, i;

	ppl = kzalloc(sizeof(*ppl), GFP_KERNEL);
	if (!ppl)
		return ERR_PTR(-ENOMEM);

	ppl->template = template;
	ppl->owner = owner;
	INIT_LIST_HEAD(&ppl->binding_list);
	INIT_LIST_HEAD(&ppl->mod_list);
	INIT_LIST_HEAD(&ppl->node);

	ret = avs_dsp_create_pipeline(adev, cfg->req_size, cfg->priority,
				      cfg->lp, cfg->attributes,
				      &ppl->instance_id);
	if (ret) {
		dev_err(adev->dev, "error creating pipeline %d\n", ret);
		kfree(ppl);
		return ERR_PTR(ret);
	}

	list_for_each_entry(tmod, &template->mod_list, node) {
		struct avs_path_module *mod;

		mod = avs_path_module_create(adev, ppl, tmod);
		if (IS_ERR(mod)) {
			ret = PTR_ERR(mod);
			dev_err(adev->dev, "error creating module %d\n", ret);
			goto init_err;
		}

		list_add_tail(&mod->node, &ppl->mod_list);
	}

	for (i = 0; i < template->num_bindings; i++) {
		struct avs_path_binding *binding;

		binding = avs_path_binding_create(adev, ppl, template->bindings[i]);
		if (IS_ERR(binding)) {
			ret = PTR_ERR(binding);
			dev_err(adev->dev, "error creating binding %d\n", ret);
			goto init_err;
		}

		list_add_tail(&binding->node, &ppl->binding_list);
	}

	return ppl;

init_err:
	avs_path_pipeline_free(adev, ppl);
	return ERR_PTR(ret);
}

static int avs_path_init(struct avs_dev *adev, struct avs_path *path,
			 struct avs_tplg_path *template, u32 dma_id)
{
	struct avs_tplg_pipeline *tppl;

	path->owner = adev;
	path->template = template;
	path->dma_id = dma_id;
	INIT_LIST_HEAD(&path->ppl_list);
	INIT_LIST_HEAD(&path->node);

	/* create all the pipelines */
	list_for_each_entry(tppl, &template->ppl_list, node) {
		struct avs_path_pipeline *ppl;

		ppl = avs_path_pipeline_create(adev, path, tppl);
		if (IS_ERR(ppl))
			return PTR_ERR(ppl);

		list_add_tail(&ppl->node, &path->ppl_list);
	}

	spin_lock(&adev->path_list_lock);
	list_add_tail(&path->node, &adev->path_list);
	spin_unlock(&adev->path_list_lock);

	return 0;
}

static int avs_path_arm(struct avs_dev *adev, struct avs_path *path)
{
	struct avs_path_pipeline *ppl;
	struct avs_path_binding *binding;
	int ret;

	list_for_each_entry(ppl, &path->ppl_list, node) {
		/*
		 * Arm all ppl bindings before binding internal modules
		 * as it costs no IPCs which isn't true for the latter.
		 */
		list_for_each_entry(binding, &ppl->binding_list, node) {
			ret = avs_path_binding_arm(adev, binding);
			if (ret < 0)
				return ret;
		}

		ret = avs_path_pipeline_arm(adev, ppl);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static void avs_path_free_unlocked(struct avs_path *path)
{
	struct avs_path_pipeline *ppl, *save;

	spin_lock(&path->owner->path_list_lock);
	list_del(&path->node);
	spin_unlock(&path->owner->path_list_lock);

	list_for_each_entry_safe(ppl, save, &path->ppl_list, node)
		avs_path_pipeline_free(path->owner, ppl);

	kfree(path);
}

static struct avs_path *avs_path_create_unlocked(struct avs_dev *adev, u32 dma_id,
						 struct avs_tplg_path *template)
{
	struct avs_path *path;
	int ret;

	path = kzalloc(sizeof(*path), GFP_KERNEL);
	if (!path)
		return ERR_PTR(-ENOMEM);

	ret = avs_path_init(adev, path, template, dma_id);
	if (ret < 0)
		goto err;

	ret = avs_path_arm(adev, path);
	if (ret < 0)
		goto err;

	path->state = AVS_PPL_STATE_INVALID;
	return path;
err:
	avs_path_free_unlocked(path);
	return ERR_PTR(ret);
}

void avs_path_free(struct avs_path *path)
{
	struct avs_dev *adev = path->owner;

	mutex_lock(&adev->path_mutex);
	avs_path_free_unlocked(path);
	mutex_unlock(&adev->path_mutex);
}

struct avs_path *avs_path_create(struct avs_dev *adev, u32 dma_id,
				 struct avs_tplg_path_template *template,
				 struct snd_pcm_hw_params *fe_params,
				 struct snd_pcm_hw_params *be_params)
{
	struct avs_tplg_path *variant;
	struct avs_path *path;

	variant = avs_path_find_variant(adev, template, fe_params, be_params);
	if (!variant) {
		dev_err(adev->dev, "no matching variant found\n");
		return ERR_PTR(-ENOENT);
	}

	/* Serialize path and its components creation. */
	mutex_lock(&adev->path_mutex);
	/* Satisfy needs of avs_path_find_tplg(). */
	mutex_lock(&adev->comp_list_mutex);

	path = avs_path_create_unlocked(adev, dma_id, variant);

	mutex_unlock(&adev->comp_list_mutex);
	mutex_unlock(&adev->path_mutex);

	return path;
}

static int avs_path_bind_prepare(struct avs_dev *adev,
				 struct avs_path_binding *binding)
{
	const struct avs_audio_format *src_fmt, *sink_fmt;
	struct avs_tplg_module *tsource = binding->source->template;
	struct avs_path_module *source = binding->source;
	int ret;

	/*
	 * only copier modules about to be bound
	 * to output pin other than 0 need preparation
	 */
	if (!binding->source_pin)
		return 0;
	if (!guid_equal(&tsource->cfg_ext->type, &AVS_COPIER_MOD_UUID))
		return 0;

	src_fmt = tsource->in_fmt;
	sink_fmt = binding->sink->template->in_fmt;

	ret = avs_ipc_copier_set_sink_format(adev, source->module_id,
					     source->instance_id, binding->source_pin,
					     src_fmt, sink_fmt);
	if (ret) {
		dev_err(adev->dev, "config copier failed: %d\n", ret);
		return AVS_IPC_RET(ret);
	}

	return 0;
}

int avs_path_bind(struct avs_path *path)
{
	struct avs_path_pipeline *ppl;
	struct avs_dev *adev = path->owner;
	int ret;

	list_for_each_entry(ppl, &path->ppl_list, node) {
		struct avs_path_binding *binding;

		list_for_each_entry(binding, &ppl->binding_list, node) {
			struct avs_path_module *source, *sink;

			source = binding->source;
			sink = binding->sink;

			ret = avs_path_bind_prepare(adev, binding);
			if (ret < 0)
				return ret;

			ret = avs_ipc_bind(adev, source->module_id,
					   source->instance_id, sink->module_id,
					   sink->instance_id, binding->sink_pin,
					   binding->source_pin);
			if (ret) {
				dev_err(adev->dev, "bind path failed: %d\n", ret);
				return AVS_IPC_RET(ret);
			}
		}
	}

	return 0;
}

int avs_path_unbind(struct avs_path *path)
{
	struct avs_path_pipeline *ppl;
	struct avs_dev *adev = path->owner;
	int ret;

	list_for_each_entry(ppl, &path->ppl_list, node) {
		struct avs_path_binding *binding;

		list_for_each_entry(binding, &ppl->binding_list, node) {
			struct avs_path_module *source, *sink;

			source = binding->source;
			sink = binding->sink;

			ret = avs_ipc_unbind(adev, source->module_id,
					     source->instance_id, sink->module_id,
					     sink->instance_id, binding->sink_pin,
					     binding->source_pin);
			if (ret) {
				dev_err(adev->dev, "unbind path failed: %d\n", ret);
				return AVS_IPC_RET(ret);
			}
		}
	}

	return 0;
}

int avs_path_reset(struct avs_path *path)
{
	struct avs_path_pipeline *ppl;
	struct avs_dev *adev = path->owner;
	int ret;

	if (path->state == AVS_PPL_STATE_RESET)
		return 0;

	list_for_each_entry(ppl, &path->ppl_list, node) {
		ret = avs_ipc_set_pipeline_state(adev, ppl->instance_id,
						 AVS_PPL_STATE_RESET);
		if (ret) {
			dev_err(adev->dev, "reset path failed: %d\n", ret);
			path->state = AVS_PPL_STATE_INVALID;
			return AVS_IPC_RET(ret);
		}
	}

	path->state = AVS_PPL_STATE_RESET;
	return 0;
}

int avs_path_pause(struct avs_path *path)
{
	struct avs_path_pipeline *ppl;
	struct avs_dev *adev = path->owner;
	int ret;

	if (path->state == AVS_PPL_STATE_PAUSED)
		return 0;

	list_for_each_entry_reverse(ppl, &path->ppl_list, node) {
		ret = avs_ipc_set_pipeline_state(adev, ppl->instance_id,
						 AVS_PPL_STATE_PAUSED);
		if (ret) {
			dev_err(adev->dev, "pause path failed: %d\n", ret);
			path->state = AVS_PPL_STATE_INVALID;
			return AVS_IPC_RET(ret);
		}
	}

	path->state = AVS_PPL_STATE_PAUSED;
	return 0;
}

int avs_path_run(struct avs_path *path, int trigger)
{
	struct avs_path_pipeline *ppl;
	struct avs_dev *adev = path->owner;
	int ret;

	if (path->state == AVS_PPL_STATE_RUNNING && trigger == AVS_TPLG_TRIGGER_AUTO)
		return 0;

	list_for_each_entry(ppl, &path->ppl_list, node) {
		if (ppl->template->cfg->trigger != trigger)
			continue;

		ret = avs_ipc_set_pipeline_state(adev, ppl->instance_id,
						 AVS_PPL_STATE_RUNNING);
		if (ret) {
			dev_err(adev->dev, "run path failed: %d\n", ret);
			path->state = AVS_PPL_STATE_INVALID;
			return AVS_IPC_RET(ret);
		}
	}

	path->state = AVS_PPL_STATE_RUNNING;
	return 0;
}