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875becf841
linux_dsm_epyc7002/sound/firewire/oxfw/oxfw-pcm.c
Takashi Sakamoto 875becf841 ALSA: firewire: process packets in 'struct snd_pcm_ops.ack' callback 
In recent commit for ALSA PCM core, some arrangement is done for
'struct snd_pcm_ops.ack' callback. This is called when appl_ptr is
explicitly moved in intermediate buffer for PCM frames, except for
some cases described later.

For drivers in ALSA firewire stack, usage of this callback has a merit to
reduce latency between time of PCM frame queueing and handling actual
packets in recent isochronous cycle, because no need to wait for software
IRQ context from isochronous context of OHCI 1394.

If this works well in a case that mapped page frame is used for the
intermediate buffer, user process should execute some commands for ioctl(2)
to tell the number of handled PCM frames in the intermediate buffer just
after handling them. Therefore, at present, with a combination of below
conditions, this doesn't work as expected and user process should wait for
the software IRQ context as usual:
 - when ALSA PCM core judges page frame mapping is available for status
   data (struct snd_pcm_mmap_status) and control data
   (struct snd_pcm_mmap_control).
 - user process handles PCM frames by loop just with 'snd_pcm_mmap_begin()'
   and 'snd_pcm_mmap_commit()'.
 - user process uses PCM hw plugin in alsa-lib to operate I/O without
   'sync_ptr_ioctl' option.

Unfortunately, major use case include these three conditions.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-07 07:53:32 +02:00

446 lines
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/*
* oxfw_pcm.c - a part of driver for OXFW970/971 based devices
*
* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "oxfw.h"
static int hw_rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
u8 **formats = rule->private;
struct snd_interval *r =
hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
const struct snd_interval *c =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
struct snd_interval t = {
.min = UINT_MAX, .max = 0, .integer = 1
};
struct snd_oxfw_stream_formation formation;
int i, err;
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
if (formats[i] == NULL)
continue;
err = snd_oxfw_stream_parse_format(formats[i], &formation);
if (err < 0)
continue;
if (!snd_interval_test(c, formation.pcm))
continue;
t.min = min(t.min, formation.rate);
t.max = max(t.max, formation.rate);
}
return snd_interval_refine(r, &t);
}
static int hw_rule_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
u8 **formats = rule->private;
struct snd_interval *c =
hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
const struct snd_interval *r =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
struct snd_oxfw_stream_formation formation;
int i, j, err;
unsigned int count, list[SND_OXFW_STREAM_FORMAT_ENTRIES] = {0};
count = 0;
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
if (formats[i] == NULL)
break;
err = snd_oxfw_stream_parse_format(formats[i], &formation);
if (err < 0)
continue;
if (!snd_interval_test(r, formation.rate))
continue;
if (list[count] == formation.pcm)
continue;
for (j = 0; j < ARRAY_SIZE(list); j++) {
if (list[j] == formation.pcm)
break;
}
if (j == ARRAY_SIZE(list)) {
list[count] = formation.pcm;
if (++count == ARRAY_SIZE(list))
break;
}
}
return snd_interval_list(c, count, list, 0);
}
static void limit_channels_and_rates(struct snd_pcm_hardware *hw, u8 **formats)
{
struct snd_oxfw_stream_formation formation;
int i, err;
hw->channels_min = UINT_MAX;
hw->channels_max = 0;
hw->rate_min = UINT_MAX;
hw->rate_max = 0;
hw->rates = 0;
for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
if (formats[i] == NULL)
break;
err = snd_oxfw_stream_parse_format(formats[i], &formation);
if (err < 0)
continue;
hw->channels_min = min(hw->channels_min, formation.pcm);
hw->channels_max = max(hw->channels_max, formation.pcm);
hw->rate_min = min(hw->rate_min, formation.rate);
hw->rate_max = max(hw->rate_max, formation.rate);
hw->rates |= snd_pcm_rate_to_rate_bit(formation.rate);
}
}
static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
{
hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
hw->periods_max = UINT_MAX;
hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */
/* Just to prevent from allocating much pages. */
hw->period_bytes_max = hw->period_bytes_min * 2048;
hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
}
static int init_hw_params(struct snd_oxfw *oxfw,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
u8 **formats;
struct amdtp_stream *stream;
int err;
runtime->hw.info = SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_JOINT_DUPLEX |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
stream = &oxfw->tx_stream;
formats = oxfw->tx_stream_formats;
} else {
runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
stream = &oxfw->rx_stream;
formats = oxfw->rx_stream_formats;
}
limit_channels_and_rates(&runtime->hw, formats);
limit_period_and_buffer(&runtime->hw);
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, formats,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
goto end;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, formats,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
goto end;
err = amdtp_am824_add_pcm_hw_constraints(stream, runtime);
end:
return err;
}
static int limit_to_current_params(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_oxfw_stream_formation formation;
enum avc_general_plug_dir dir;
int err;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
dir = AVC_GENERAL_PLUG_DIR_OUT;
else
dir = AVC_GENERAL_PLUG_DIR_IN;
err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
if (err < 0)
goto end;
substream->runtime->hw.channels_min = formation.pcm;
substream->runtime->hw.channels_max = formation.pcm;
substream->runtime->hw.rate_min = formation.rate;
substream->runtime->hw.rate_max = formation.rate;
end:
return err;
}
static int pcm_open(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
int err;
err = snd_oxfw_stream_lock_try(oxfw);
if (err < 0)
goto end;
err = init_hw_params(oxfw, substream);
if (err < 0)
goto err_locked;
/*
* When any PCM streams are already running, the available sampling
* rate is limited at current value.
*/
if (amdtp_stream_pcm_running(&oxfw->tx_stream) ||
amdtp_stream_pcm_running(&oxfw->rx_stream)) {
err = limit_to_current_params(substream);
if (err < 0)
goto end;
}
snd_pcm_set_sync(substream);
end:
return err;
err_locked:
snd_oxfw_stream_lock_release(oxfw);
return err;
}
static int pcm_close(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
snd_oxfw_stream_lock_release(oxfw);
return 0;
}
static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_oxfw *oxfw = substream->private_data;
int err;
err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
mutex_lock(&oxfw->mutex);
oxfw->capture_substreams++;
mutex_unlock(&oxfw->mutex);
}
return 0;
}
static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_oxfw *oxfw = substream->private_data;
int err;
err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
mutex_lock(&oxfw->mutex);
oxfw->playback_substreams++;
mutex_unlock(&oxfw->mutex);
}
return 0;
}
static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
mutex_lock(&oxfw->mutex);
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
oxfw->capture_substreams--;
snd_oxfw_stream_stop_simplex(oxfw, &oxfw->tx_stream);
mutex_unlock(&oxfw->mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
mutex_lock(&oxfw->mutex);
if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
oxfw->playback_substreams--;
snd_oxfw_stream_stop_simplex(oxfw, &oxfw->rx_stream);
mutex_unlock(&oxfw->mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int pcm_capture_prepare(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
mutex_lock(&oxfw->mutex);
err = snd_oxfw_stream_start_simplex(oxfw, &oxfw->tx_stream,
runtime->rate, runtime->channels);
mutex_unlock(&oxfw->mutex);
if (err < 0)
goto end;
amdtp_stream_pcm_prepare(&oxfw->tx_stream);
end:
return err;
}
static int pcm_playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
mutex_lock(&oxfw->mutex);
err = snd_oxfw_stream_start_simplex(oxfw, &oxfw->rx_stream,
runtime->rate, runtime->channels);
mutex_unlock(&oxfw->mutex);
if (err < 0)
goto end;
amdtp_stream_pcm_prepare(&oxfw->rx_stream);
end:
return err;
}
static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_substream *pcm;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
pcm = substream;
break;
case SNDRV_PCM_TRIGGER_STOP:
pcm = NULL;
break;
default:
return -EINVAL;
}
amdtp_stream_pcm_trigger(&oxfw->tx_stream, pcm);
return 0;
}
static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_substream *pcm;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
pcm = substream;
break;
case SNDRV_PCM_TRIGGER_STOP:
pcm = NULL;
break;
default:
return -EINVAL;
}
amdtp_stream_pcm_trigger(&oxfw->rx_stream, pcm);
return 0;
}
static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstm)
{
struct snd_oxfw *oxfw = sbstm->private_data;
return amdtp_stream_pcm_pointer(&oxfw->tx_stream);
}
static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstm)
{
struct snd_oxfw *oxfw = sbstm->private_data;
return amdtp_stream_pcm_pointer(&oxfw->rx_stream);
}
static int pcm_capture_ack(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
return amdtp_stream_pcm_ack(&oxfw->tx_stream);
}
static int pcm_playback_ack(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
return amdtp_stream_pcm_ack(&oxfw->rx_stream);
}
int snd_oxfw_create_pcm(struct snd_oxfw *oxfw)
{
static const struct snd_pcm_ops capture_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pcm_capture_hw_params,
.hw_free = pcm_capture_hw_free,
.prepare = pcm_capture_prepare,
.trigger = pcm_capture_trigger,
.pointer = pcm_capture_pointer,
.ack = pcm_capture_ack,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
static const struct snd_pcm_ops playback_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pcm_playback_hw_params,
.hw_free = pcm_playback_hw_free,
.prepare = pcm_playback_prepare,
.trigger = pcm_playback_trigger,
.pointer = pcm_playback_pointer,
.ack = pcm_playback_ack,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
struct snd_pcm *pcm;
unsigned int cap = 0;
int err;
if (oxfw->has_output)
cap = 1;
err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, cap, &pcm);
if (err < 0)
return err;
pcm->private_data = oxfw;
strcpy(pcm->name, oxfw->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
if (cap > 0)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
return 0;
}
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