ASoC: SOF: Intel: hda-dai: Define and set the HDA DAI widget DMA ops

Define and set the get_hext_stream, assign_hext_stream and
release_hext_stream DMA ops for HDA DAIs.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230307140435.2808-9-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/Makefile

@@ -5,7 +5,7 @@ snd-sof-acpi-intel-bdw-objs := bdw.o
 
 snd-sof-intel-hda-common-objs := hda.o hda-loader.o hda-stream.o hda-trace.o \
 				 hda-dsp.o hda-ipc.o hda-ctrl.o hda-pcm.o \
-				 hda-dai.o hda-bus.o hda-mlink.o \
+				 hda-dai.o hda-dai-ops.o hda-bus.o hda-mlink.o \
 				 skl.o hda-loader-skl.o \
 				 apl.o cnl.o tgl.o icl.o mtl.o hda-common-ops.o
 

sound/soc/sof/intel/hda-dai-ops.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) 2022 Intel Corporation. All rights reserved.
+
+#include <sound/pcm_params.h>
+#include <sound/hdaudio_ext.h>
+#include <sound/sof/ipc4/header.h>
+#include <uapi/sound/sof/header.h>
+#include "../ipc4-priv.h"
+#include "../ipc4-topology.h"
+#include "../sof-priv.h"
+#include "../sof-audio.h"
+#include "hda.h"
+
+/* These ops are only applicable for the HDA DAI's in their current form */
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+/*
+ * This function checks if the host dma channel corresponding
+ * to the link DMA stream_tag argument is assigned to one
+ * of the FEs connected to the BE DAI.
+ */
+static bool hda_check_fes(struct snd_soc_pcm_runtime *rtd,
+			  int dir, int stream_tag)
+{
+	struct snd_pcm_substream *fe_substream;
+	struct hdac_stream *fe_hstream;
+	struct snd_soc_dpcm *dpcm;
+
+	for_each_dpcm_fe(rtd, dir, dpcm) {
+		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, dir);
+		fe_hstream = fe_substream->runtime->private_data;
+		if (fe_hstream->stream_tag == stream_tag)
+			return true;
+	}
+
+	return false;
+}
+
+static struct hdac_ext_stream *
+hda_link_stream_assign(struct hdac_bus *bus, struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct sof_intel_hda_stream *hda_stream;
+	const struct sof_intel_dsp_desc *chip;
+	struct snd_sof_dev *sdev;
+	struct hdac_ext_stream *res = NULL;
+	struct hdac_stream *hstream = NULL;
+
+	int stream_dir = substream->stream;
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "stream type not supported\n");
+		return NULL;
+	}
+
+	spin_lock_irq(&bus->reg_lock);
+	list_for_each_entry(hstream, &bus->stream_list, list) {
+		struct hdac_ext_stream *hext_stream =
+			stream_to_hdac_ext_stream(hstream);
+		if (hstream->direction != substream->stream)
+			continue;
+
+		hda_stream = hstream_to_sof_hda_stream(hext_stream);
+		sdev = hda_stream->sdev;
+		chip = get_chip_info(sdev->pdata);
+
+		/* check if link is available */
+		if (!hext_stream->link_locked) {
+			/*
+			 * choose the first available link for platforms that do not have the
+			 * PROCEN_FMT_QUIRK set.
+			 */
+			if (!(chip->quirks & SOF_INTEL_PROCEN_FMT_QUIRK)) {
+				res = hext_stream;
+				break;
+			}
+
+			if (hstream->opened) {
+				/*
+				 * check if the stream tag matches the stream
+				 * tag of one of the connected FEs
+				 */
+				if (hda_check_fes(rtd, stream_dir,
+						  hstream->stream_tag)) {
+					res = hext_stream;
+					break;
+				}
+			} else {
+				res = hext_stream;
+
+				/*
+				 * This must be a hostless stream.
+				 * So reserve the host DMA channel.
+				 */
+				hda_stream->host_reserved = 1;
+				break;
+			}
+		}
+	}
+
+	if (res) {
+		/* Make sure that host and link DMA is decoupled. */
+		snd_hdac_ext_stream_decouple_locked(bus, res, true);
+
+		res->link_locked = 1;
+		res->link_substream = substream;
+	}
+	spin_unlock_irq(&bus->reg_lock);
+
+	return res;
+}
+
+static struct hdac_ext_stream *hda_get_hext_stream(struct snd_sof_dev *sdev,
+						   struct snd_soc_dai *cpu_dai,
+						   struct snd_pcm_substream *substream)
+{
+	return snd_soc_dai_get_dma_data(cpu_dai, substream);
+}
+
+static struct hdac_ext_stream *hda_assign_hext_stream(struct snd_sof_dev *sdev,
+						      struct snd_soc_dai *cpu_dai,
+						      struct snd_pcm_substream *substream)
+{
+	struct hdac_ext_stream *hext_stream;
+
+	hext_stream = hda_link_stream_assign(sof_to_bus(sdev), substream);
+	if (!hext_stream)
+		return NULL;
+
+	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)hext_stream);
+
+	return hext_stream;
+}
+
+static void hda_release_hext_stream(struct snd_sof_dev *sdev, struct snd_soc_dai *cpu_dai,
+				    struct snd_pcm_substream *substream)
+{
+	struct hdac_ext_stream *hext_stream = hda_get_hext_stream(sdev, cpu_dai, substream);
+
+	snd_soc_dai_set_dma_data(cpu_dai, substream, NULL);
+	snd_hdac_ext_stream_release(hext_stream, HDAC_EXT_STREAM_TYPE_LINK);
+}
+
+static const struct hda_dai_widget_dma_ops hda_dma_ops = {
+	.get_hext_stream = hda_get_hext_stream,
+	.assign_hext_stream = hda_assign_hext_stream,
+	.release_hext_stream = hda_release_hext_stream,
+};
+
+#endif
+
+const struct hda_dai_widget_dma_ops *
+hda_select_dai_widget_ops(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
+{
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+	struct snd_sof_dai *sdai = swidget->private;
+
+	switch (sdev->pdata->ipc_type) {
+	case SOF_IPC:
+	{
+		struct sof_dai_private_data *private = sdai->private;
+
+		if (private->dai_config->type == SOF_DAI_INTEL_HDA)
+			return &hda_dma_ops;
+		break;
+	}
+	case SOF_INTEL_IPC4:
+	{
+		struct sof_ipc4_copier *ipc4_copier = sdai->private;
+
+		if (ipc4_copier->dai_type == SOF_DAI_INTEL_HDA)
+			return &hda_dma_ops;
+		break;
+	}
+	default:
+		break;
+	}
+#endif
+	return NULL;
+}

sound/soc/sof/intel/hda.h

@@ -959,4 +959,8 @@ struct hda_dai_widget_dma_ops {
 	int (*post_trigger)(struct snd_sof_dev *sdev, struct snd_soc_dai *cpu_dai,
 			    struct snd_pcm_substream *substream, int cmd);
 };
+
+const struct hda_dai_widget_dma_ops *
+hda_select_dai_widget_ops(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget);
+
 #endif