[PATCH v3] ASoC: SOF: compr: Add compress ops implementation

From: Daniel Baluta
Date: Thu Jan 20 2022 - 09:38:02 EST


From: Daniel Baluta <daniel.baluta@xxxxxxx>

Implement snd_compress_ops. There are a lot of similarities with
PCM implementation.

For now we use sof_ipc_pcm_params to transfer compress parameters to SOF
firmware.

This will be changed in the future once we either add new compress
parameters to SOF or enhance existing sof_ipc_pcm_params structure
to support all native compress params.

Note that get_caps and get_codec_caps are missing and will be added
later. This is because we need to find a way to advertise DSP
capabilities depending on supported platforms.

Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
---
Changes since v2:
- dropped patch 2/2 because deciding on how to support get_caps and get_codec_caps needs
some rework.
- annotated commit message for 1/2 to mention about get_caps and get_codec_caps

Changes since v1:
(https://lore.kernel.org/lkml/20220113161341.371345-1-daniel.baluta@xxxxxxxxxxx/T/)

- Addressed review from Cezary and Pierre
- fixed layout of declaration blocks to be more consistent
- avoid using rtd and runtime simultaneously inside a function (always
used rtd and crtd)
- check return code for create_page_table
- completely remove sof_compr_stream and use snd_compr_tstmap instead to
keep compress stream related info.·
- add get_caps and get_codec_caps implementations (in patch 2)·

sound/soc/sof/compress.c | 273 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 271 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/compress.c b/sound/soc/sof/compress.c
index 01ca85f0b87f..91a9c95929cd 100644
--- a/sound/soc/sof/compress.c
+++ b/sound/soc/sof/compress.c
@@ -10,6 +10,22 @@
#include "sof-audio.h"
#include "sof-priv.h"

+static void sof_set_transferred_bytes(struct snd_compr_tstamp *tstamp,
+ u64 host_pos, u64 buffer_size)
+{
+ u64 prev_pos;
+ unsigned int copied;
+
+ div64_u64_rem(tstamp->copied_total, buffer_size, &prev_pos);
+
+ if (host_pos < prev_pos)
+ copied = (buffer_size - prev_pos) + host_pos;
+ else
+ copied = host_pos - prev_pos;
+
+ tstamp->copied_total += copied;
+}
+
static void snd_sof_compr_fragment_elapsed_work(struct work_struct *work)
{
struct snd_sof_pcm_stream *sps =
@@ -29,14 +45,16 @@ void snd_sof_compr_init_elapsed_work(struct work_struct *work)
*/
void snd_sof_compr_fragment_elapsed(struct snd_compr_stream *cstream)
{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *crtd = cstream->runtime;
struct snd_soc_component *component;
- struct snd_soc_pcm_runtime *rtd;
+ struct snd_compr_tstamp *tstamp;
struct snd_sof_pcm *spcm;

if (!cstream)
return;

- rtd = cstream->private_data;
+ tstamp = crtd->private_data;
component = snd_soc_rtdcom_lookup(rtd, SOF_AUDIO_PCM_DRV_NAME);

spcm = snd_sof_find_spcm_dai(component, rtd);
@@ -46,6 +64,257 @@ void snd_sof_compr_fragment_elapsed(struct snd_compr_stream *cstream)
return;
}

+ sof_set_transferred_bytes(tstamp, spcm->stream[cstream->direction].posn.host_posn,
+ crtd->buffer_size);
+
/* use the same workqueue-based solution as for PCM, cf. snd_sof_pcm_elapsed */
schedule_work(&spcm->stream[cstream->direction].period_elapsed_work);
}
+
+static int create_page_table(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream,
+ unsigned char *dma_area, size_t size)
+{
+ struct snd_dma_buffer *dmab = cstream->runtime->dma_buffer_p;
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ int dir = cstream->direction;
+ struct snd_sof_pcm *spcm;
+
+ spcm = snd_sof_find_spcm_dai(component, rtd);
+ if (!spcm)
+ return -EINVAL;
+
+ return snd_sof_create_page_table(component->dev, dmab,
+ spcm->stream[dir].page_table.area, size);
+}
+
+int sof_compr_open(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *crtd = cstream->runtime;
+ struct snd_compr_tstamp *tstamp;
+ struct snd_sof_pcm *spcm;
+ int dir;
+
+ tstamp = kzalloc(sizeof(*tstamp), GFP_KERNEL);
+ if (!tstamp)
+ return -ENOMEM;
+
+ spcm = snd_sof_find_spcm_dai(component, rtd);
+ if (!spcm) {
+ kfree(tstamp);
+ return -EINVAL;
+ }
+
+ dir = cstream->direction;
+
+ if (spcm->stream[dir].cstream) {
+ kfree(tstamp);
+ return -EBUSY;
+ }
+
+ spcm->stream[dir].cstream = cstream;
+ spcm->stream[dir].posn.host_posn = 0;
+ spcm->stream[dir].posn.dai_posn = 0;
+ spcm->prepared[dir] = false;
+
+ crtd->private_data = tstamp;
+
+ return 0;
+}
+
+int sof_compr_free(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream)
+{
+ struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
+ struct snd_compr_tstamp *tstamp = cstream->runtime->private_data;
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct sof_ipc_stream stream;
+ struct sof_ipc_reply reply;
+ struct snd_sof_pcm *spcm;
+ int ret = 0;
+
+ spcm = snd_sof_find_spcm_dai(component, rtd);
+ if (!spcm)
+ return -EINVAL;
+
+ stream.hdr.size = sizeof(stream);
+ stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_FREE;
+ stream.comp_id = spcm->stream[cstream->direction].comp_id;
+
+ if (spcm->prepared[cstream->direction]) {
+ ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd,
+ &stream, sizeof(stream),
+ &reply, sizeof(reply));
+ if (!ret)
+ spcm->prepared[cstream->direction] = false;
+ }
+
+ cancel_work_sync(&spcm->stream[cstream->direction].period_elapsed_work);
+ spcm->stream[cstream->direction].cstream = NULL;
+ kfree(tstamp);
+
+ return ret;
+}
+
+int sof_compr_set_params(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream, struct snd_compr_params *params)
+{
+ struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *crtd = cstream->runtime;
+ struct sof_ipc_pcm_params_reply ipc_params_reply;
+ struct snd_compr_tstamp *tstamp;
+ struct sof_ipc_pcm_params pcm;
+ struct snd_sof_pcm *spcm;
+ int ret;
+
+ tstamp = crtd->private_data;
+
+ spcm = snd_sof_find_spcm_dai(component, rtd);
+
+ if (!spcm)
+ return -EINVAL;
+
+ cstream->dma_buffer.dev.type = SNDRV_DMA_TYPE_DEV_SG;
+ cstream->dma_buffer.dev.dev = sdev->dev;
+ ret = snd_compr_malloc_pages(cstream, crtd->buffer_size);
+ if (ret < 0)
+ return ret;
+
+ ret = create_page_table(component, cstream, crtd->dma_area, crtd->dma_bytes);
+ if (ret < 0)
+ return ret;
+
+ memset(&pcm, 0, sizeof(pcm));
+
+ pcm.params.buffer.pages = PFN_UP(crtd->dma_bytes);
+ pcm.hdr.size = sizeof(pcm);
+ pcm.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_PARAMS;
+
+ pcm.comp_id = spcm->stream[cstream->direction].comp_id;
+ pcm.params.hdr.size = sizeof(pcm.params);
+ pcm.params.buffer.phy_addr = spcm->stream[cstream->direction].page_table.addr;
+ pcm.params.buffer.size = crtd->dma_bytes;
+ pcm.params.direction = cstream->direction;
+ pcm.params.channels = params->codec.ch_out;
+ pcm.params.rate = params->codec.sample_rate;
+ pcm.params.buffer_fmt = SOF_IPC_BUFFER_INTERLEAVED;
+ pcm.params.frame_fmt = SOF_IPC_FRAME_S32_LE;
+ pcm.params.sample_container_bytes =
+ snd_pcm_format_physical_width(SNDRV_PCM_FORMAT_S32) >> 3;
+ pcm.params.host_period_bytes = params->buffer.fragment_size;
+
+ ret = sof_ipc_tx_message(sdev->ipc, pcm.hdr.cmd, &pcm, sizeof(pcm),
+ &ipc_params_reply, sizeof(ipc_params_reply));
+ if (ret < 0) {
+ dev_err(component->dev, "error ipc failed\n");
+ return ret;
+ }
+
+ tstamp->byte_offset = sdev->stream_box.offset + ipc_params_reply.posn_offset;
+ tstamp->sampling_rate = params->codec.sample_rate;
+
+ spcm->prepared[cstream->direction] = true;
+
+ return 0;
+}
+
+int sof_compr_get_params(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream, struct snd_codec *params)
+{
+ /* TODO: we don't query the supported codecs for now, if the
+ * application asks for an unsupported codec the set_params() will fail.
+ */
+ return 0;
+}
+
+int sof_compr_trigger(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream, int cmd)
+{
+ struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct sof_ipc_stream stream;
+ struct sof_ipc_reply reply;
+ struct snd_sof_pcm *spcm;
+
+ spcm = snd_sof_find_spcm_dai(component, rtd);
+ if (!spcm)
+ return -EINVAL;
+
+ stream.hdr.size = sizeof(stream);
+ stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG;
+ stream.comp_id = spcm->stream[cstream->direction].comp_id;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_START;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_STOP;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_PAUSE;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_RELEASE;
+ break;
+ default:
+ dev_err(component->dev, "error: unhandled trigger cmd %d\n", cmd);
+ break;
+ }
+
+ return sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd,
+ &stream, sizeof(stream),
+ &reply, sizeof(reply));
+}
+
+int sof_compr_copy(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream,
+ char __user *buf, size_t count)
+{
+ struct snd_compr_runtime *rtd = cstream->runtime;
+ unsigned int offset, n;
+ void *ptr;
+ int ret;
+
+ if (count > rtd->buffer_size)
+ count = rtd->buffer_size;
+
+ div_u64_rem(rtd->total_bytes_available, rtd->buffer_size, &offset);
+ ptr = rtd->dma_area + offset;
+ n = rtd->buffer_size - offset;
+
+ if (count < n) {
+ ret = copy_from_user(ptr, buf, count);
+ } else {
+ ret = copy_from_user(ptr, buf, n);
+ ret += copy_from_user(rtd->dma_area, buf + n, count - n);
+ }
+
+ return count - ret;
+}
+
+static int sof_compr_pointer(struct snd_soc_component *component,
+ struct snd_compr_stream *cstream,
+ struct snd_compr_tstamp *tstamp)
+{
+ struct snd_compr_tstamp *pstamp = cstream->runtime->private_data;
+
+ tstamp->sampling_rate = pstamp->sampling_rate;
+ tstamp->copied_total = pstamp->copied_total;
+
+ return 0;
+}
+
+struct snd_compress_ops sof_compressed_ops = {
+ .open = sof_compr_open,
+ .free = sof_compr_free,
+ .set_params = sof_compr_set_params,
+ .get_params = sof_compr_get_params,
+ .trigger = sof_compr_trigger,
+ .pointer = sof_compr_pointer,
+ .copy = sof_compr_copy,
+};
+EXPORT_SYMBOL(sof_compressed_ops);
--
2.27.0