ALSA: xen-front: Read sound driver configuration from Xen store
Read configuration values from Xen store according
to xen/interface/io/sndif.h protocol:
- introduce configuration structures for different
components, e.g. sound card, device, stream
- read PCM HW parameters, e.g rate, format etc.
- detect stream type (capture/playback)
- read device and card parameters
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Oleksandr Andrushchenko
Takashi Iwai
parent
cc3196ae19
commit
fd3b36045c
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@ -1,5 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0 OR MIT
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snd_xen_front-objs := xen_snd_front.o
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snd_xen_front-objs := xen_snd_front.o \
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xen_snd_front_cfg.o
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obj-$(CONFIG_SND_XEN_FRONTEND) += snd_xen_front.o
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@ -25,6 +25,13 @@ static void xen_snd_drv_fini(struct xen_snd_front_info *front_info)
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static int sndback_initwait(struct xen_snd_front_info *front_info)
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{
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int num_streams;
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int ret;
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ret = xen_snd_front_cfg_card(front_info, &num_streams);
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if (ret < 0)
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return ret;
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return 0;
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}
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@ -11,8 +11,12 @@
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#ifndef __XEN_SND_FRONT_H
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#define __XEN_SND_FRONT_H
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#include "xen_snd_front_cfg.h"
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struct xen_snd_front_info {
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struct xenbus_device *xb_dev;
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struct xen_front_cfg_card cfg;
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};
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#endif /* __XEN_SND_FRONT_H */
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@ -0,0 +1,517 @@
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// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Xen para-virtual sound device
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*
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* Copyright (C) 2016-2018 EPAM Systems Inc.
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*
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* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
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*/
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#include <xen/xenbus.h>
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#include <xen/interface/io/sndif.h>
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#include "xen_snd_front.h"
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#include "xen_snd_front_cfg.h"
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/* Maximum number of supported streams. */
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#define VSND_MAX_STREAM 8
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struct cfg_hw_sample_rate {
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const char *name;
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unsigned int mask;
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unsigned int value;
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};
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static const struct cfg_hw_sample_rate CFG_HW_SUPPORTED_RATES[] = {
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{ .name = "5512", .mask = SNDRV_PCM_RATE_5512, .value = 5512 },
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{ .name = "8000", .mask = SNDRV_PCM_RATE_8000, .value = 8000 },
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{ .name = "11025", .mask = SNDRV_PCM_RATE_11025, .value = 11025 },
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{ .name = "16000", .mask = SNDRV_PCM_RATE_16000, .value = 16000 },
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{ .name = "22050", .mask = SNDRV_PCM_RATE_22050, .value = 22050 },
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{ .name = "32000", .mask = SNDRV_PCM_RATE_32000, .value = 32000 },
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{ .name = "44100", .mask = SNDRV_PCM_RATE_44100, .value = 44100 },
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{ .name = "48000", .mask = SNDRV_PCM_RATE_48000, .value = 48000 },
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{ .name = "64000", .mask = SNDRV_PCM_RATE_64000, .value = 64000 },
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{ .name = "96000", .mask = SNDRV_PCM_RATE_96000, .value = 96000 },
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{ .name = "176400", .mask = SNDRV_PCM_RATE_176400, .value = 176400 },
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{ .name = "192000", .mask = SNDRV_PCM_RATE_192000, .value = 192000 },
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};
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struct cfg_hw_sample_format {
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const char *name;
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u64 mask;
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};
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static const struct cfg_hw_sample_format CFG_HW_SUPPORTED_FORMATS[] = {
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{
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.name = XENSND_PCM_FORMAT_U8_STR,
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.mask = SNDRV_PCM_FMTBIT_U8
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},
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{
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.name = XENSND_PCM_FORMAT_S8_STR,
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.mask = SNDRV_PCM_FMTBIT_S8
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},
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{
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.name = XENSND_PCM_FORMAT_U16_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_U16_LE
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},
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{
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.name = XENSND_PCM_FORMAT_U16_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_U16_BE
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},
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{
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.name = XENSND_PCM_FORMAT_S16_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_S16_LE
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},
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{
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.name = XENSND_PCM_FORMAT_S16_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_S16_BE
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},
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{
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.name = XENSND_PCM_FORMAT_U24_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_U24_LE
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},
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{
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.name = XENSND_PCM_FORMAT_U24_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_U24_BE
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},
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{
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.name = XENSND_PCM_FORMAT_S24_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_S24_LE
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},
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{
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.name = XENSND_PCM_FORMAT_S24_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_S24_BE
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},
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{
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.name = XENSND_PCM_FORMAT_U32_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_U32_LE
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},
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{
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.name = XENSND_PCM_FORMAT_U32_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_U32_BE
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},
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{
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.name = XENSND_PCM_FORMAT_S32_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_S32_LE
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},
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{
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.name = XENSND_PCM_FORMAT_S32_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_S32_BE
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},
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{
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.name = XENSND_PCM_FORMAT_A_LAW_STR,
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.mask = SNDRV_PCM_FMTBIT_A_LAW
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},
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{
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.name = XENSND_PCM_FORMAT_MU_LAW_STR,
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.mask = SNDRV_PCM_FMTBIT_MU_LAW
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},
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{
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.name = XENSND_PCM_FORMAT_F32_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_FLOAT_LE
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},
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{
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.name = XENSND_PCM_FORMAT_F32_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_FLOAT_BE
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},
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{
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.name = XENSND_PCM_FORMAT_F64_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_FLOAT64_LE
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},
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{
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.name = XENSND_PCM_FORMAT_F64_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_FLOAT64_BE
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},
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{
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.name = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE_STR,
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.mask = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
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},
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{
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.name = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE_STR,
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.mask = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
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},
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{
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.name = XENSND_PCM_FORMAT_IMA_ADPCM_STR,
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.mask = SNDRV_PCM_FMTBIT_IMA_ADPCM
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},
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{
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.name = XENSND_PCM_FORMAT_MPEG_STR,
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.mask = SNDRV_PCM_FMTBIT_MPEG
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},
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{
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.name = XENSND_PCM_FORMAT_GSM_STR,
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.mask = SNDRV_PCM_FMTBIT_GSM
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},
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};
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static void cfg_hw_rates(char *list, unsigned int len,
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const char *path, struct snd_pcm_hardware *pcm_hw)
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{
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char *cur_rate;
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unsigned int cur_mask;
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unsigned int cur_value;
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unsigned int rates;
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unsigned int rate_min;
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unsigned int rate_max;
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int i;
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rates = 0;
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rate_min = -1;
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rate_max = 0;
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while ((cur_rate = strsep(&list, XENSND_LIST_SEPARATOR))) {
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for (i = 0; i < ARRAY_SIZE(CFG_HW_SUPPORTED_RATES); i++)
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if (!strncasecmp(cur_rate,
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CFG_HW_SUPPORTED_RATES[i].name,
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XENSND_SAMPLE_RATE_MAX_LEN)) {
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cur_mask = CFG_HW_SUPPORTED_RATES[i].mask;
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cur_value = CFG_HW_SUPPORTED_RATES[i].value;
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rates |= cur_mask;
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if (rate_min > cur_value)
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rate_min = cur_value;
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if (rate_max < cur_value)
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rate_max = cur_value;
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}
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}
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if (rates) {
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pcm_hw->rates = rates;
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pcm_hw->rate_min = rate_min;
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pcm_hw->rate_max = rate_max;
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}
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}
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static void cfg_formats(char *list, unsigned int len,
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const char *path, struct snd_pcm_hardware *pcm_hw)
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{
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u64 formats;
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char *cur_format;
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int i;
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formats = 0;
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while ((cur_format = strsep(&list, XENSND_LIST_SEPARATOR))) {
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for (i = 0; i < ARRAY_SIZE(CFG_HW_SUPPORTED_FORMATS); i++)
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if (!strncasecmp(cur_format,
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CFG_HW_SUPPORTED_FORMATS[i].name,
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XENSND_SAMPLE_FORMAT_MAX_LEN))
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formats |= CFG_HW_SUPPORTED_FORMATS[i].mask;
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}
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if (formats)
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pcm_hw->formats = formats;
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}
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#define MAX_BUFFER_SIZE (64 * 1024)
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#define MIN_PERIOD_SIZE 64
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#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
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#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | \
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SNDRV_PCM_FMTBIT_S16_LE)
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#define USE_RATE (SNDRV_PCM_RATE_CONTINUOUS | \
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SNDRV_PCM_RATE_8000_48000)
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#define USE_RATE_MIN 5512
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#define USE_RATE_MAX 48000
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#define USE_CHANNELS_MIN 1
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#define USE_CHANNELS_MAX 2
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#define USE_PERIODS_MIN 2
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#define USE_PERIODS_MAX (MAX_BUFFER_SIZE / MIN_PERIOD_SIZE)
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static const struct snd_pcm_hardware SND_DRV_PCM_HW_DEFAULT = {
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.info = (SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_MMAP_VALID),
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.formats = USE_FORMATS,
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.rates = USE_RATE,
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.rate_min = USE_RATE_MIN,
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.rate_max = USE_RATE_MAX,
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.channels_min = USE_CHANNELS_MIN,
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.channels_max = USE_CHANNELS_MAX,
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.buffer_bytes_max = MAX_BUFFER_SIZE,
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.period_bytes_min = MIN_PERIOD_SIZE,
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.period_bytes_max = MAX_PERIOD_SIZE,
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.periods_min = USE_PERIODS_MIN,
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.periods_max = USE_PERIODS_MAX,
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.fifo_size = 0,
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};
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static void cfg_read_pcm_hw(const char *path,
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struct snd_pcm_hardware *parent_pcm_hw,
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struct snd_pcm_hardware *pcm_hw)
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{
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char *list;
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int val;
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size_t buf_sz;
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unsigned int len;
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/* Inherit parent's PCM HW and read overrides from XenStore. */
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if (parent_pcm_hw)
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*pcm_hw = *parent_pcm_hw;
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else
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*pcm_hw = SND_DRV_PCM_HW_DEFAULT;
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val = xenbus_read_unsigned(path, XENSND_FIELD_CHANNELS_MIN, 0);
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if (val)
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pcm_hw->channels_min = val;
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val = xenbus_read_unsigned(path, XENSND_FIELD_CHANNELS_MAX, 0);
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if (val)
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pcm_hw->channels_max = val;
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list = xenbus_read(XBT_NIL, path, XENSND_FIELD_SAMPLE_RATES, &len);
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if (!IS_ERR(list)) {
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cfg_hw_rates(list, len, path, pcm_hw);
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kfree(list);
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}
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list = xenbus_read(XBT_NIL, path, XENSND_FIELD_SAMPLE_FORMATS, &len);
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if (!IS_ERR(list)) {
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cfg_formats(list, len, path, pcm_hw);
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kfree(list);
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}
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buf_sz = xenbus_read_unsigned(path, XENSND_FIELD_BUFFER_SIZE, 0);
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if (buf_sz)
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pcm_hw->buffer_bytes_max = buf_sz;
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/* Update configuration to match new values. */
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if (pcm_hw->channels_min > pcm_hw->channels_max)
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pcm_hw->channels_min = pcm_hw->channels_max;
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if (pcm_hw->rate_min > pcm_hw->rate_max)
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pcm_hw->rate_min = pcm_hw->rate_max;
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pcm_hw->period_bytes_max = pcm_hw->buffer_bytes_max;
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pcm_hw->periods_max = pcm_hw->period_bytes_max /
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pcm_hw->period_bytes_min;
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}
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static int cfg_get_stream_type(const char *path, int index,
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int *num_pb, int *num_cap)
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{
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char *str = NULL;
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char *stream_path;
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int ret;
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*num_pb = 0;
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*num_cap = 0;
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stream_path = kasprintf(GFP_KERNEL, "%s/%d", path, index);
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if (!stream_path) {
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ret = -ENOMEM;
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goto fail;
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}
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str = xenbus_read(XBT_NIL, stream_path, XENSND_FIELD_TYPE, NULL);
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if (IS_ERR(str)) {
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ret = PTR_ERR(str);
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goto fail;
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}
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if (!strncasecmp(str, XENSND_STREAM_TYPE_PLAYBACK,
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sizeof(XENSND_STREAM_TYPE_PLAYBACK))) {
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(*num_pb)++;
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} else if (!strncasecmp(str, XENSND_STREAM_TYPE_CAPTURE,
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sizeof(XENSND_STREAM_TYPE_CAPTURE))) {
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(*num_cap)++;
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} else {
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ret = -EINVAL;
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goto fail;
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}
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ret = 0;
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fail:
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kfree(stream_path);
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kfree(str);
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return ret;
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}
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static int cfg_stream(struct xen_snd_front_info *front_info,
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struct xen_front_cfg_pcm_instance *pcm_instance,
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const char *path, int index, int *cur_pb, int *cur_cap,
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int *stream_cnt)
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{
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char *str = NULL;
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char *stream_path;
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struct xen_front_cfg_stream *stream;
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int ret;
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stream_path = devm_kasprintf(&front_info->xb_dev->dev,
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GFP_KERNEL, "%s/%d", path, index);
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if (!stream_path) {
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ret = -ENOMEM;
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goto fail;
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}
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str = xenbus_read(XBT_NIL, stream_path, XENSND_FIELD_TYPE, NULL);
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if (IS_ERR(str)) {
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ret = PTR_ERR(str);
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goto fail;
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}
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if (!strncasecmp(str, XENSND_STREAM_TYPE_PLAYBACK,
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sizeof(XENSND_STREAM_TYPE_PLAYBACK))) {
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stream = &pcm_instance->streams_pb[(*cur_pb)++];
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} else if (!strncasecmp(str, XENSND_STREAM_TYPE_CAPTURE,
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sizeof(XENSND_STREAM_TYPE_CAPTURE))) {
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stream = &pcm_instance->streams_cap[(*cur_cap)++];
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} else {
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ret = -EINVAL;
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goto fail;
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}
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/* Get next stream index. */
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stream->index = (*stream_cnt)++;
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stream->xenstore_path = stream_path;
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/*
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* Check XenStore if PCM HW configuration exists for this stream
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* and update if so, e.g. we inherit all values from device's PCM HW,
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* but can still override some of the values for the stream.
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*/
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cfg_read_pcm_hw(stream->xenstore_path,
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&pcm_instance->pcm_hw, &stream->pcm_hw);
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ret = 0;
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fail:
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kfree(str);
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return ret;
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}
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static int cfg_device(struct xen_snd_front_info *front_info,
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struct xen_front_cfg_pcm_instance *pcm_instance,
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struct snd_pcm_hardware *parent_pcm_hw,
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const char *path, int node_index, int *stream_cnt)
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{
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char *str;
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char *device_path;
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int ret, i, num_streams;
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int num_pb, num_cap;
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int cur_pb, cur_cap;
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char node[3];
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device_path = kasprintf(GFP_KERNEL, "%s/%d", path, node_index);
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if (!device_path)
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return -ENOMEM;
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str = xenbus_read(XBT_NIL, device_path, XENSND_FIELD_DEVICE_NAME, NULL);
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if (!IS_ERR(str)) {
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strncpy(pcm_instance->name, str, sizeof(pcm_instance->name));
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kfree(str);
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}
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pcm_instance->device_id = node_index;
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/*
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* Check XenStore if PCM HW configuration exists for this device
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* and update if so, e.g. we inherit all values from card's PCM HW,
|
||||
* but can still override some of the values for the device.
|
||||
*/
|
||||
cfg_read_pcm_hw(device_path, parent_pcm_hw, &pcm_instance->pcm_hw);
|
||||
|
||||
/* Find out how many streams were configured in Xen store. */
|
||||
num_streams = 0;
|
||||
do {
|
||||
snprintf(node, sizeof(node), "%d", num_streams);
|
||||
if (!xenbus_exists(XBT_NIL, device_path, node))
|
||||
break;
|
||||
|
||||
num_streams++;
|
||||
} while (num_streams < VSND_MAX_STREAM);
|
||||
|
||||
pcm_instance->num_streams_pb = 0;
|
||||
pcm_instance->num_streams_cap = 0;
|
||||
/* Get number of playback and capture streams. */
|
||||
for (i = 0; i < num_streams; i++) {
|
||||
ret = cfg_get_stream_type(device_path, i, &num_pb, &num_cap);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
|
||||
pcm_instance->num_streams_pb += num_pb;
|
||||
pcm_instance->num_streams_cap += num_cap;
|
||||
}
|
||||
|
||||
if (pcm_instance->num_streams_pb) {
|
||||
pcm_instance->streams_pb =
|
||||
devm_kcalloc(&front_info->xb_dev->dev,
|
||||
pcm_instance->num_streams_pb,
|
||||
sizeof(struct xen_front_cfg_stream),
|
||||
GFP_KERNEL);
|
||||
if (!pcm_instance->streams_pb) {
|
||||
ret = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
if (pcm_instance->num_streams_cap) {
|
||||
pcm_instance->streams_cap =
|
||||
devm_kcalloc(&front_info->xb_dev->dev,
|
||||
pcm_instance->num_streams_cap,
|
||||
sizeof(struct xen_front_cfg_stream),
|
||||
GFP_KERNEL);
|
||||
if (!pcm_instance->streams_cap) {
|
||||
ret = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
cur_pb = 0;
|
||||
cur_cap = 0;
|
||||
for (i = 0; i < num_streams; i++) {
|
||||
ret = cfg_stream(front_info, pcm_instance, device_path, i,
|
||||
&cur_pb, &cur_cap, stream_cnt);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
}
|
||||
ret = 0;
|
||||
|
||||
fail:
|
||||
kfree(device_path);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int xen_snd_front_cfg_card(struct xen_snd_front_info *front_info,
|
||||
int *stream_cnt)
|
||||
{
|
||||
struct xenbus_device *xb_dev = front_info->xb_dev;
|
||||
struct xen_front_cfg_card *cfg = &front_info->cfg;
|
||||
int ret, num_devices, i;
|
||||
char node[3];
|
||||
|
||||
*stream_cnt = 0;
|
||||
num_devices = 0;
|
||||
do {
|
||||
snprintf(node, sizeof(node), "%d", num_devices);
|
||||
if (!xenbus_exists(XBT_NIL, xb_dev->nodename, node))
|
||||
break;
|
||||
|
||||
num_devices++;
|
||||
} while (num_devices < SNDRV_PCM_DEVICES);
|
||||
|
||||
if (!num_devices) {
|
||||
dev_warn(&xb_dev->dev,
|
||||
"No devices configured for sound card at %s\n",
|
||||
xb_dev->nodename);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Start from default PCM HW configuration for the card. */
|
||||
cfg_read_pcm_hw(xb_dev->nodename, NULL, &cfg->pcm_hw);
|
||||
|
||||
cfg->pcm_instances =
|
||||
devm_kcalloc(&front_info->xb_dev->dev, num_devices,
|
||||
sizeof(struct xen_front_cfg_pcm_instance),
|
||||
GFP_KERNEL);
|
||||
if (!cfg->pcm_instances)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < num_devices; i++) {
|
||||
ret = cfg_device(front_info, &cfg->pcm_instances[i],
|
||||
&cfg->pcm_hw, xb_dev->nodename, i, stream_cnt);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
cfg->num_pcm_instances = num_devices;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
|
||||
|
||||
/*
|
||||
* Xen para-virtual sound device
|
||||
*
|
||||
* Copyright (C) 2016-2018 EPAM Systems Inc.
|
||||
*
|
||||
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
|
||||
*/
|
||||
|
||||
#ifndef __XEN_SND_FRONT_CFG_H
|
||||
#define __XEN_SND_FRONT_CFG_H
|
||||
|
||||
#include <sound/core.h>
|
||||
#include <sound/pcm.h>
|
||||
|
||||
struct xen_snd_front_info;
|
||||
|
||||
struct xen_front_cfg_stream {
|
||||
int index;
|
||||
char *xenstore_path;
|
||||
struct snd_pcm_hardware pcm_hw;
|
||||
};
|
||||
|
||||
struct xen_front_cfg_pcm_instance {
|
||||
char name[80];
|
||||
int device_id;
|
||||
struct snd_pcm_hardware pcm_hw;
|
||||
int num_streams_pb;
|
||||
struct xen_front_cfg_stream *streams_pb;
|
||||
int num_streams_cap;
|
||||
struct xen_front_cfg_stream *streams_cap;
|
||||
};
|
||||
|
||||
struct xen_front_cfg_card {
|
||||
char name_short[32];
|
||||
char name_long[80];
|
||||
struct snd_pcm_hardware pcm_hw;
|
||||
int num_pcm_instances;
|
||||
struct xen_front_cfg_pcm_instance *pcm_instances;
|
||||
};
|
||||
|
||||
int xen_snd_front_cfg_card(struct xen_snd_front_info *front_info,
|
||||
int *stream_cnt);
|
||||
|
||||
#endif /* __XEN_SND_FRONT_CFG_H */
|
||||
Loading…
Reference in New Issue