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ALSA: xen-front: Implement ALSA virtual sound driver

Ver a proveniência 
Implement essential initialization of the sound driver:
  - introduce required data structures
  - handle driver registration
  - handle sound card registration
  - register sound driver on backend connection
  - remove sound driver on backend disconnect

Initialize virtual sound card with streams according to the
Xen store configuration.

Implement ALSA driver operations including:
  - manage frontend/backend shared buffers
  - manage Xen bus event channel states

Implement requests from front to back for ALSA
PCM operations.
  - report ALSA period elapsed event: handle XENSND_EVT_CUR_POS
    notifications from the backend when stream position advances
    during playback/capture. The event carries a value of how
    many octets were played/captured at the time of the event.
  - implement explicit stream parameter negotiation between
    backend and frontend: handle XENSND_OP_HW_PARAM_QUERY request
    to read/update configuration space for the parameter given:
    request passes desired parameter interval and the response to
    this request returns min/max interval for the parameter to be used.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Este cometimento está contido em:
Oleksandr Andrushchenko
2018-05-14 09:27:41 +03:00
cometido por Takashi Iwai
ascendente d6e0fbb82e
cometimento 1cee559351
6 ficheiros modificados com 1056 adições e 3 eliminações
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181
sound/xen/xen_snd_front.c
Ver ficheiro

@@ -19,10 +19,189 @@
#include <xen/interface/io/sndif.h>
#include "xen_snd_front.h"
#include "xen_snd_front_alsa.h"
#include "xen_snd_front_evtchnl.h"
#include "xen_snd_front_shbuf.h"
static struct xensnd_req *
be_stream_prepare_req(struct xen_snd_front_evtchnl *evtchnl, u8 operation)
{
struct xensnd_req *req;
req = RING_GET_REQUEST(&evtchnl->u.req.ring,
evtchnl->u.req.ring.req_prod_pvt);
req->operation = operation;
req->id = evtchnl->evt_next_id++;
evtchnl->evt_id = req->id;
return req;
}
static int be_stream_do_io(struct xen_snd_front_evtchnl *evtchnl)
{
if (unlikely(evtchnl->state != EVTCHNL_STATE_CONNECTED))
return -EIO;
reinit_completion(&evtchnl->u.req.completion);
xen_snd_front_evtchnl_flush(evtchnl);
return 0;
}
static int be_stream_wait_io(struct xen_snd_front_evtchnl *evtchnl)
{
if (wait_for_completion_timeout(&evtchnl->u.req.completion,
msecs_to_jiffies(VSND_WAIT_BACK_MS)) <= 0)
return -ETIMEDOUT;
return evtchnl->u.req.resp_status;
}
int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
struct xensnd_query_hw_param *hw_param_req,
struct xensnd_query_hw_param *hw_param_resp)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_HW_PARAM_QUERY);
req->op.hw_param = *hw_param_req;
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
if (ret == 0)
*hw_param_resp = evtchnl->u.req.resp.hw_param;
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
struct xen_snd_front_shbuf *sh_buf,
u8 format, unsigned int channels,
unsigned int rate, u32 buffer_sz,
u32 period_sz)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_OPEN);
req->op.open.pcm_format = format;
req->op.open.pcm_channels = channels;
req->op.open.pcm_rate = rate;
req->op.open.buffer_sz = buffer_sz;
req->op.open.period_sz = period_sz;
req->op.open.gref_directory = xen_snd_front_shbuf_get_dir_start(sh_buf);
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_CLOSE);
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
unsigned long pos, unsigned long count)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_WRITE);
req->op.rw.length = count;
req->op.rw.offset = pos;
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
unsigned long pos, unsigned long count)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_READ);
req->op.rw.length = count;
req->op.rw.offset = pos;
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
int type)
{
struct xensnd_req *req;
int ret;
mutex_lock(&evtchnl->u.req.req_io_lock);
mutex_lock(&evtchnl->ring_io_lock);
req = be_stream_prepare_req(evtchnl, XENSND_OP_TRIGGER);
req->op.trigger.type = type;
mutex_unlock(&evtchnl->ring_io_lock);
ret = be_stream_do_io(evtchnl);
if (ret == 0)
ret = be_stream_wait_io(evtchnl);
mutex_unlock(&evtchnl->u.req.req_io_lock);
return ret;
}
static void xen_snd_drv_fini(struct xen_snd_front_info *front_info)
{
xen_snd_front_alsa_fini(front_info);
xen_snd_front_evtchnl_free_all(front_info);
}
@@ -45,7 +224,7 @@ static int sndback_initwait(struct xen_snd_front_info *front_info)
static int sndback_connect(struct xen_snd_front_info *front_info)
{
return 0;
return xen_snd_front_alsa_init(front_info);
}
static void sndback_disconnect(struct xen_snd_front_info *front_info)