ALSA: xen-front: Implement ALSA virtual sound driver
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>
hifive-unleashed-5.1
Oleksandr Andrushchenko
Takashi Iwai
parent
d6e0fbb82e
commit
1cee559351
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@ -3,6 +3,7 @@
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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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xen_snd_front_evtchnl.o \
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xen_snd_front_shbuf.o
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xen_snd_front_shbuf.o \
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xen_snd_front_alsa.o
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obj-$(CONFIG_SND_XEN_FRONTEND) += snd_xen_front.o
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@ -19,10 +19,189 @@
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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_alsa.h"
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#include "xen_snd_front_evtchnl.h"
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#include "xen_snd_front_shbuf.h"
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static struct xensnd_req *
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be_stream_prepare_req(struct xen_snd_front_evtchnl *evtchnl, u8 operation)
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{
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struct xensnd_req *req;
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req = RING_GET_REQUEST(&evtchnl->u.req.ring,
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evtchnl->u.req.ring.req_prod_pvt);
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req->operation = operation;
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req->id = evtchnl->evt_next_id++;
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evtchnl->evt_id = req->id;
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return req;
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}
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static int be_stream_do_io(struct xen_snd_front_evtchnl *evtchnl)
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{
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if (unlikely(evtchnl->state != EVTCHNL_STATE_CONNECTED))
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return -EIO;
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reinit_completion(&evtchnl->u.req.completion);
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xen_snd_front_evtchnl_flush(evtchnl);
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return 0;
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}
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static int be_stream_wait_io(struct xen_snd_front_evtchnl *evtchnl)
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{
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if (wait_for_completion_timeout(&evtchnl->u.req.completion,
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msecs_to_jiffies(VSND_WAIT_BACK_MS)) <= 0)
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return -ETIMEDOUT;
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return evtchnl->u.req.resp_status;
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}
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int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
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struct xensnd_query_hw_param *hw_param_req,
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struct xensnd_query_hw_param *hw_param_resp)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_HW_PARAM_QUERY);
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req->op.hw_param = *hw_param_req;
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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if (ret == 0)
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*hw_param_resp = evtchnl->u.req.resp.hw_param;
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
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struct xen_snd_front_shbuf *sh_buf,
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u8 format, unsigned int channels,
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unsigned int rate, u32 buffer_sz,
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u32 period_sz)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_OPEN);
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req->op.open.pcm_format = format;
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req->op.open.pcm_channels = channels;
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req->op.open.pcm_rate = rate;
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req->op.open.buffer_sz = buffer_sz;
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req->op.open.period_sz = period_sz;
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req->op.open.gref_directory = xen_snd_front_shbuf_get_dir_start(sh_buf);
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_CLOSE);
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
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unsigned long pos, unsigned long count)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_WRITE);
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req->op.rw.length = count;
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req->op.rw.offset = pos;
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
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unsigned long pos, unsigned long count)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_READ);
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req->op.rw.length = count;
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req->op.rw.offset = pos;
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
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int type)
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{
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struct xensnd_req *req;
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int ret;
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mutex_lock(&evtchnl->u.req.req_io_lock);
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mutex_lock(&evtchnl->ring_io_lock);
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req = be_stream_prepare_req(evtchnl, XENSND_OP_TRIGGER);
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req->op.trigger.type = type;
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mutex_unlock(&evtchnl->ring_io_lock);
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ret = be_stream_do_io(evtchnl);
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if (ret == 0)
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ret = be_stream_wait_io(evtchnl);
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mutex_unlock(&evtchnl->u.req.req_io_lock);
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return ret;
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}
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static void xen_snd_drv_fini(struct xen_snd_front_info *front_info)
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{
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xen_snd_front_alsa_fini(front_info);
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xen_snd_front_evtchnl_free_all(front_info);
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}
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@ -45,7 +224,7 @@ static int sndback_initwait(struct xen_snd_front_info *front_info)
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static int sndback_connect(struct xen_snd_front_info *front_info)
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{
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return 0;
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return xen_snd_front_alsa_init(front_info);
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}
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static void sndback_disconnect(struct xen_snd_front_info *front_info)
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@ -13,15 +13,42 @@
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#include "xen_snd_front_cfg.h"
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struct xen_snd_front_card_info;
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struct xen_snd_front_evtchnl;
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struct xen_snd_front_evtchnl_pair;
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struct xen_snd_front_shbuf;
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struct xensnd_query_hw_param;
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struct xen_snd_front_info {
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struct xenbus_device *xb_dev;
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struct xen_snd_front_card_info *card_info;
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int num_evt_pairs;
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struct xen_snd_front_evtchnl_pair *evt_pairs;
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struct xen_front_cfg_card cfg;
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};
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int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
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struct xensnd_query_hw_param *hw_param_req,
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struct xensnd_query_hw_param *hw_param_resp);
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int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
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struct xen_snd_front_shbuf *sh_buf,
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u8 format, unsigned int channels,
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unsigned int rate, u32 buffer_sz,
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u32 period_sz);
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int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
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int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
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unsigned long pos, unsigned long count);
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int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
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unsigned long pos, unsigned long count);
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int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
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int type);
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#endif /* __XEN_SND_FRONT_H */
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@ -0,0 +1,821 @@
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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 <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <xen/xenbus.h>
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#include "xen_snd_front.h"
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#include "xen_snd_front_alsa.h"
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#include "xen_snd_front_cfg.h"
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#include "xen_snd_front_evtchnl.h"
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#include "xen_snd_front_shbuf.h"
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struct xen_snd_front_pcm_stream_info {
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struct xen_snd_front_info *front_info;
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struct xen_snd_front_evtchnl_pair *evt_pair;
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struct xen_snd_front_shbuf sh_buf;
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int index;
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bool is_open;
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struct snd_pcm_hardware pcm_hw;
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/* Number of processed frames as reported by the backend. */
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snd_pcm_uframes_t be_cur_frame;
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/* Current HW pointer to be reported via .period callback. */
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atomic_t hw_ptr;
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/* Modulo of the number of processed frames - for period detection. */
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u32 out_frames;
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};
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struct xen_snd_front_pcm_instance_info {
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struct xen_snd_front_card_info *card_info;
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struct snd_pcm *pcm;
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struct snd_pcm_hardware pcm_hw;
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int num_pcm_streams_pb;
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struct xen_snd_front_pcm_stream_info *streams_pb;
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int num_pcm_streams_cap;
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struct xen_snd_front_pcm_stream_info *streams_cap;
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};
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struct xen_snd_front_card_info {
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struct xen_snd_front_info *front_info;
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struct snd_card *card;
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struct snd_pcm_hardware pcm_hw;
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int num_pcm_instances;
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struct xen_snd_front_pcm_instance_info *pcm_instances;
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};
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struct alsa_sndif_sample_format {
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u8 sndif;
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snd_pcm_format_t alsa;
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};
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struct alsa_sndif_hw_param {
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u8 sndif;
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snd_pcm_hw_param_t alsa;
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};
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static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = {
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{
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.sndif = XENSND_PCM_FORMAT_U8,
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.alsa = SNDRV_PCM_FORMAT_U8
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},
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{
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.sndif = XENSND_PCM_FORMAT_S8,
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.alsa = SNDRV_PCM_FORMAT_S8
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},
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{
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.sndif = XENSND_PCM_FORMAT_U16_LE,
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.alsa = SNDRV_PCM_FORMAT_U16_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U16_BE,
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.alsa = SNDRV_PCM_FORMAT_U16_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S16_LE,
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.alsa = SNDRV_PCM_FORMAT_S16_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S16_BE,
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.alsa = SNDRV_PCM_FORMAT_S16_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U24_LE,
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.alsa = SNDRV_PCM_FORMAT_U24_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U24_BE,
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.alsa = SNDRV_PCM_FORMAT_U24_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S24_LE,
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.alsa = SNDRV_PCM_FORMAT_S24_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S24_BE,
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.alsa = SNDRV_PCM_FORMAT_S24_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U32_LE,
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.alsa = SNDRV_PCM_FORMAT_U32_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_U32_BE,
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.alsa = SNDRV_PCM_FORMAT_U32_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S32_LE,
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.alsa = SNDRV_PCM_FORMAT_S32_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_S32_BE,
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.alsa = SNDRV_PCM_FORMAT_S32_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_A_LAW,
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.alsa = SNDRV_PCM_FORMAT_A_LAW
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},
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{
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.sndif = XENSND_PCM_FORMAT_MU_LAW,
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.alsa = SNDRV_PCM_FORMAT_MU_LAW
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},
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{
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.sndif = XENSND_PCM_FORMAT_F32_LE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F32_BE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F64_LE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT64_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_F64_BE,
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.alsa = SNDRV_PCM_FORMAT_FLOAT64_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE,
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.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE,
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.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE
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},
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{
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.sndif = XENSND_PCM_FORMAT_IMA_ADPCM,
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.alsa = SNDRV_PCM_FORMAT_IMA_ADPCM
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},
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{
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.sndif = XENSND_PCM_FORMAT_MPEG,
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.alsa = SNDRV_PCM_FORMAT_MPEG
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},
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{
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.sndif = XENSND_PCM_FORMAT_GSM,
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.alsa = SNDRV_PCM_FORMAT_GSM
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},
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};
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static int to_sndif_format(snd_pcm_format_t format)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
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if (ALSA_SNDIF_FORMATS[i].alsa == format)
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return ALSA_SNDIF_FORMATS[i].sndif;
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return -EINVAL;
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}
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static u64 to_sndif_formats_mask(u64 alsa_formats)
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{
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u64 mask;
|
||||
int i;
|
||||
|
||||
mask = 0;
|
||||
for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
|
||||
if (1 << ALSA_SNDIF_FORMATS[i].alsa & alsa_formats)
|
||||
mask |= 1 << ALSA_SNDIF_FORMATS[i].sndif;
|
||||
|
||||
return mask;
|
||||
}
|
||||
|
||||
static u64 to_alsa_formats_mask(u64 sndif_formats)
|
||||
{
|
||||
u64 mask;
|
||||
int i;
|
||||
|
||||
mask = 0;
|
||||
for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
|
||||
if (1 << ALSA_SNDIF_FORMATS[i].sndif & sndif_formats)
|
||||
mask |= 1 << ALSA_SNDIF_FORMATS[i].alsa;
|
||||
|
||||
return mask;
|
||||
}
|
||||
|
||||
static void stream_clear(struct xen_snd_front_pcm_stream_info *stream)
|
||||
{
|
||||
stream->is_open = false;
|
||||
stream->be_cur_frame = 0;
|
||||
stream->out_frames = 0;
|
||||
atomic_set(&stream->hw_ptr, 0);
|
||||
xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
|
||||
xen_snd_front_shbuf_clear(&stream->sh_buf);
|
||||
}
|
||||
|
||||
static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
|
||||
{
|
||||
xen_snd_front_shbuf_free(&stream->sh_buf);
|
||||
stream_clear(stream);
|
||||
}
|
||||
|
||||
static struct xen_snd_front_pcm_stream_info *
|
||||
stream_get(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_instance_info *pcm_instance =
|
||||
snd_pcm_substream_chip(substream);
|
||||
struct xen_snd_front_pcm_stream_info *stream;
|
||||
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
stream = &pcm_instance->streams_pb[substream->number];
|
||||
else
|
||||
stream = &pcm_instance->streams_cap[substream->number];
|
||||
|
||||
return stream;
|
||||
}
|
||||
|
||||
static int alsa_hw_rule(struct snd_pcm_hw_params *params,
|
||||
struct snd_pcm_hw_rule *rule)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = rule->private;
|
||||
struct device *dev = &stream->front_info->xb_dev->dev;
|
||||
struct snd_mask *formats =
|
||||
hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
|
||||
struct snd_interval *rates =
|
||||
hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
|
||||
struct snd_interval *channels =
|
||||
hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
|
||||
struct snd_interval *period =
|
||||
hw_param_interval(params,
|
||||
SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
|
||||
struct snd_interval *buffer =
|
||||
hw_param_interval(params,
|
||||
SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
|
||||
struct xensnd_query_hw_param req;
|
||||
struct xensnd_query_hw_param resp;
|
||||
struct snd_interval interval;
|
||||
struct snd_mask mask;
|
||||
u64 sndif_formats;
|
||||
int changed, ret;
|
||||
|
||||
/* Collect all the values we need for the query. */
|
||||
|
||||
req.formats = to_sndif_formats_mask((u64)formats->bits[0] |
|
||||
(u64)(formats->bits[1]) << 32);
|
||||
|
||||
req.rates.min = rates->min;
|
||||
req.rates.max = rates->max;
|
||||
|
||||
req.channels.min = channels->min;
|
||||
req.channels.max = channels->max;
|
||||
|
||||
req.buffer.min = buffer->min;
|
||||
req.buffer.max = buffer->max;
|
||||
|
||||
req.period.min = period->min;
|
||||
req.period.max = period->max;
|
||||
|
||||
ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req,
|
||||
&req, &resp);
|
||||
if (ret < 0) {
|
||||
/* Check if this is due to backend communication error. */
|
||||
if (ret == -EIO || ret == -ETIMEDOUT)
|
||||
dev_err(dev, "Failed to query ALSA HW parameters\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Refine HW parameters after the query. */
|
||||
changed = 0;
|
||||
|
||||
sndif_formats = to_alsa_formats_mask(resp.formats);
|
||||
snd_mask_none(&mask);
|
||||
mask.bits[0] = (u32)sndif_formats;
|
||||
mask.bits[1] = (u32)(sndif_formats >> 32);
|
||||
ret = snd_mask_refine(formats, &mask);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
changed |= ret;
|
||||
|
||||
interval.openmin = 0;
|
||||
interval.openmax = 0;
|
||||
interval.integer = 1;
|
||||
|
||||
interval.min = resp.rates.min;
|
||||
interval.max = resp.rates.max;
|
||||
ret = snd_interval_refine(rates, &interval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
changed |= ret;
|
||||
|
||||
interval.min = resp.channels.min;
|
||||
interval.max = resp.channels.max;
|
||||
ret = snd_interval_refine(channels, &interval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
changed |= ret;
|
||||
|
||||
interval.min = resp.buffer.min;
|
||||
interval.max = resp.buffer.max;
|
||||
ret = snd_interval_refine(buffer, &interval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
changed |= ret;
|
||||
|
||||
interval.min = resp.period.min;
|
||||
interval.max = resp.period.max;
|
||||
ret = snd_interval_refine(period, &interval);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
changed |= ret;
|
||||
|
||||
return changed;
|
||||
}
|
||||
|
||||
static int alsa_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_instance_info *pcm_instance =
|
||||
snd_pcm_substream_chip(substream);
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct xen_snd_front_info *front_info =
|
||||
pcm_instance->card_info->front_info;
|
||||
struct device *dev = &front_info->xb_dev->dev;
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* Return our HW properties: override defaults with those configured
|
||||
* via XenStore.
|
||||
*/
|
||||
runtime->hw = stream->pcm_hw;
|
||||
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
|
||||
SNDRV_PCM_INFO_MMAP_VALID |
|
||||
SNDRV_PCM_INFO_DOUBLE |
|
||||
SNDRV_PCM_INFO_BATCH |
|
||||
SNDRV_PCM_INFO_NONINTERLEAVED |
|
||||
SNDRV_PCM_INFO_RESUME |
|
||||
SNDRV_PCM_INFO_PAUSE);
|
||||
runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED;
|
||||
|
||||
stream->evt_pair = &front_info->evt_pairs[stream->index];
|
||||
|
||||
stream->front_info = front_info;
|
||||
|
||||
stream->evt_pair->evt.u.evt.substream = substream;
|
||||
|
||||
stream_clear(stream);
|
||||
|
||||
xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true);
|
||||
|
||||
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
|
||||
alsa_hw_rule, stream,
|
||||
SNDRV_PCM_HW_PARAM_FORMAT, -1);
|
||||
if (ret) {
|
||||
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
|
||||
alsa_hw_rule, stream,
|
||||
SNDRV_PCM_HW_PARAM_RATE, -1);
|
||||
if (ret) {
|
||||
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
|
||||
alsa_hw_rule, stream,
|
||||
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
|
||||
if (ret) {
|
||||
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
|
||||
alsa_hw_rule, stream,
|
||||
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
|
||||
if (ret) {
|
||||
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
|
||||
alsa_hw_rule, stream,
|
||||
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
|
||||
if (ret) {
|
||||
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alsa_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alsa_hw_params(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* This callback may be called multiple times,
|
||||
* so free the previously allocated shared buffer if any.
|
||||
*/
|
||||
stream_free(stream);
|
||||
|
||||
ret = xen_snd_front_shbuf_alloc(stream->front_info->xb_dev,
|
||||
&stream->sh_buf,
|
||||
params_buffer_bytes(params));
|
||||
if (ret < 0) {
|
||||
stream_free(stream);
|
||||
dev_err(&stream->front_info->xb_dev->dev,
|
||||
"Failed to allocate buffers for stream with index %d\n",
|
||||
stream->index);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alsa_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
int ret;
|
||||
|
||||
ret = xen_snd_front_stream_close(&stream->evt_pair->req);
|
||||
stream_free(stream);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int alsa_prepare(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
if (!stream->is_open) {
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
u8 sndif_format;
|
||||
int ret;
|
||||
|
||||
sndif_format = to_sndif_format(runtime->format);
|
||||
if (sndif_format < 0) {
|
||||
dev_err(&stream->front_info->xb_dev->dev,
|
||||
"Unsupported sample format: %d\n",
|
||||
runtime->format);
|
||||
return sndif_format;
|
||||
}
|
||||
|
||||
ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
|
||||
&stream->sh_buf,
|
||||
sndif_format,
|
||||
runtime->channels,
|
||||
runtime->rate,
|
||||
snd_pcm_lib_buffer_bytes(substream),
|
||||
snd_pcm_lib_period_bytes(substream));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
stream->is_open = true;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alsa_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
int type;
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
type = XENSND_OP_TRIGGER_START;
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_RESUME:
|
||||
type = XENSND_OP_TRIGGER_RESUME;
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
type = XENSND_OP_TRIGGER_STOP;
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
type = XENSND_OP_TRIGGER_PAUSE;
|
||||
break;
|
||||
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return xen_snd_front_stream_trigger(&stream->evt_pair->req, type);
|
||||
}
|
||||
|
||||
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
|
||||
u64 pos_bytes)
|
||||
{
|
||||
struct snd_pcm_substream *substream = evtchnl->u.evt.substream;
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
snd_pcm_uframes_t delta, new_hw_ptr, cur_frame;
|
||||
|
||||
cur_frame = bytes_to_frames(substream->runtime, pos_bytes);
|
||||
|
||||
delta = cur_frame - stream->be_cur_frame;
|
||||
stream->be_cur_frame = cur_frame;
|
||||
|
||||
new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
|
||||
new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size;
|
||||
atomic_set(&stream->hw_ptr, (int)new_hw_ptr);
|
||||
|
||||
stream->out_frames += delta;
|
||||
if (stream->out_frames > substream->runtime->period_size) {
|
||||
stream->out_frames %= substream->runtime->period_size;
|
||||
snd_pcm_period_elapsed(substream);
|
||||
}
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
|
||||
}
|
||||
|
||||
static int alsa_pb_copy_user(struct snd_pcm_substream *substream,
|
||||
int channel, unsigned long pos, void __user *src,
|
||||
unsigned long count)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
|
||||
return -EINVAL;
|
||||
|
||||
if (copy_from_user(stream->sh_buf.buffer + pos, src, count))
|
||||
return -EFAULT;
|
||||
|
||||
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
||||
}
|
||||
|
||||
static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream,
|
||||
int channel, unsigned long pos, void *src,
|
||||
unsigned long count)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
|
||||
return -EINVAL;
|
||||
|
||||
memcpy(stream->sh_buf.buffer + pos, src, count);
|
||||
|
||||
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
||||
}
|
||||
|
||||
static int alsa_cap_copy_user(struct snd_pcm_substream *substream,
|
||||
int channel, unsigned long pos, void __user *dst,
|
||||
unsigned long count)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
int ret;
|
||||
|
||||
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
|
||||
return -EINVAL;
|
||||
|
||||
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return copy_to_user(dst, stream->sh_buf.buffer + pos, count) ?
|
||||
-EFAULT : 0;
|
||||
}
|
||||
|
||||
static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream,
|
||||
int channel, unsigned long pos, void *dst,
|
||||
unsigned long count)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
int ret;
|
||||
|
||||
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
|
||||
return -EINVAL;
|
||||
|
||||
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
memcpy(dst, stream->sh_buf.buffer + pos, count);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int alsa_pb_fill_silence(struct snd_pcm_substream *substream,
|
||||
int channel, unsigned long pos,
|
||||
unsigned long count)
|
||||
{
|
||||
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
|
||||
|
||||
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
|
||||
return -EINVAL;
|
||||
|
||||
memset(stream->sh_buf.buffer + pos, 0, count);
|
||||
|
||||
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
|
||||
}
|
||||
|
||||
/*
|
||||
* FIXME: The mmaped data transfer is asynchronous and there is no
|
||||
* ack signal from user-space when it is done. This is the
|
||||
* reason it is not implemented in the PV driver as we do need
|
||||
* to know when the buffer can be transferred to the backend.
|
||||
*/
|
||||
|
||||
static struct snd_pcm_ops snd_drv_alsa_playback_ops = {
|
||||
.open = alsa_open,
|
||||
.close = alsa_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = alsa_hw_params,
|
||||
.hw_free = alsa_hw_free,
|
||||
.prepare = alsa_prepare,
|
||||
.trigger = alsa_trigger,
|
||||
.pointer = alsa_pointer,
|
||||
.copy_user = alsa_pb_copy_user,
|
||||
.copy_kernel = alsa_pb_copy_kernel,
|
||||
.fill_silence = alsa_pb_fill_silence,
|
||||
};
|
||||
|
||||
static struct snd_pcm_ops snd_drv_alsa_capture_ops = {
|
||||
.open = alsa_open,
|
||||
.close = alsa_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = alsa_hw_params,
|
||||
.hw_free = alsa_hw_free,
|
||||
.prepare = alsa_prepare,
|
||||
.trigger = alsa_trigger,
|
||||
.pointer = alsa_pointer,
|
||||
.copy_user = alsa_cap_copy_user,
|
||||
.copy_kernel = alsa_cap_copy_kernel,
|
||||
};
|
||||
|
||||
static int new_pcm_instance(struct xen_snd_front_card_info *card_info,
|
||||
struct xen_front_cfg_pcm_instance *instance_cfg,
|
||||
struct xen_snd_front_pcm_instance_info *pcm_instance_info)
|
||||
{
|
||||
struct snd_pcm *pcm;
|
||||
int ret, i;
|
||||
|
||||
dev_dbg(&card_info->front_info->xb_dev->dev,
|
||||
"New PCM device \"%s\" with id %d playback %d capture %d",
|
||||
instance_cfg->name,
|
||||
instance_cfg->device_id,
|
||||
instance_cfg->num_streams_pb,
|
||||
instance_cfg->num_streams_cap);
|
||||
|
||||
pcm_instance_info->card_info = card_info;
|
||||
|
||||
pcm_instance_info->pcm_hw = instance_cfg->pcm_hw;
|
||||
|
||||
if (instance_cfg->num_streams_pb) {
|
||||
pcm_instance_info->streams_pb =
|
||||
devm_kcalloc(&card_info->card->card_dev,
|
||||
instance_cfg->num_streams_pb,
|
||||
sizeof(struct xen_snd_front_pcm_stream_info),
|
||||
GFP_KERNEL);
|
||||
if (!pcm_instance_info->streams_pb)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
if (instance_cfg->num_streams_cap) {
|
||||
pcm_instance_info->streams_cap =
|
||||
devm_kcalloc(&card_info->card->card_dev,
|
||||
instance_cfg->num_streams_cap,
|
||||
sizeof(struct xen_snd_front_pcm_stream_info),
|
||||
GFP_KERNEL);
|
||||
if (!pcm_instance_info->streams_cap)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
pcm_instance_info->num_pcm_streams_pb =
|
||||
instance_cfg->num_streams_pb;
|
||||
pcm_instance_info->num_pcm_streams_cap =
|
||||
instance_cfg->num_streams_cap;
|
||||
|
||||
for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) {
|
||||
pcm_instance_info->streams_pb[i].pcm_hw =
|
||||
instance_cfg->streams_pb[i].pcm_hw;
|
||||
pcm_instance_info->streams_pb[i].index =
|
||||
instance_cfg->streams_pb[i].index;
|
||||
}
|
||||
|
||||
for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) {
|
||||
pcm_instance_info->streams_cap[i].pcm_hw =
|
||||
instance_cfg->streams_cap[i].pcm_hw;
|
||||
pcm_instance_info->streams_cap[i].index =
|
||||
instance_cfg->streams_cap[i].index;
|
||||
}
|
||||
|
||||
ret = snd_pcm_new(card_info->card, instance_cfg->name,
|
||||
instance_cfg->device_id,
|
||||
instance_cfg->num_streams_pb,
|
||||
instance_cfg->num_streams_cap,
|
||||
&pcm);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
pcm->private_data = pcm_instance_info;
|
||||
pcm->info_flags = 0;
|
||||
/* we want to handle all PCM operations in non-atomic context */
|
||||
pcm->nonatomic = true;
|
||||
strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name));
|
||||
|
||||
if (instance_cfg->num_streams_pb)
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
||||
&snd_drv_alsa_playback_ops);
|
||||
|
||||
if (instance_cfg->num_streams_cap)
|
||||
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
|
||||
&snd_drv_alsa_capture_ops);
|
||||
|
||||
pcm_instance_info->pcm = pcm;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info)
|
||||
{
|
||||
struct device *dev = &front_info->xb_dev->dev;
|
||||
struct xen_front_cfg_card *cfg = &front_info->cfg;
|
||||
struct xen_snd_front_card_info *card_info;
|
||||
struct snd_card *card;
|
||||
int ret, i;
|
||||
|
||||
dev_dbg(dev, "Creating virtual sound card\n");
|
||||
|
||||
ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE,
|
||||
sizeof(struct xen_snd_front_card_info), &card);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
card_info = card->private_data;
|
||||
card_info->front_info = front_info;
|
||||
front_info->card_info = card_info;
|
||||
card_info->card = card;
|
||||
card_info->pcm_instances =
|
||||
devm_kcalloc(dev, cfg->num_pcm_instances,
|
||||
sizeof(struct xen_snd_front_pcm_instance_info),
|
||||
GFP_KERNEL);
|
||||
if (!card_info->pcm_instances) {
|
||||
ret = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
card_info->num_pcm_instances = cfg->num_pcm_instances;
|
||||
card_info->pcm_hw = cfg->pcm_hw;
|
||||
|
||||
for (i = 0; i < cfg->num_pcm_instances; i++) {
|
||||
ret = new_pcm_instance(card_info, &cfg->pcm_instances[i],
|
||||
&card_info->pcm_instances[i]);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
}
|
||||
|
||||
strncpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver));
|
||||
strncpy(card->shortname, cfg->name_short, sizeof(card->shortname));
|
||||
strncpy(card->longname, cfg->name_long, sizeof(card->longname));
|
||||
|
||||
ret = snd_card_register(card);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
snd_card_free(card);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info)
|
||||
{
|
||||
struct xen_snd_front_card_info *card_info;
|
||||
struct snd_card *card;
|
||||
|
||||
card_info = front_info->card_info;
|
||||
if (!card_info)
|
||||
return;
|
||||
|
||||
card = card_info->card;
|
||||
if (!card)
|
||||
return;
|
||||
|
||||
dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n",
|
||||
card->number);
|
||||
snd_card_free(card);
|
||||
|
||||
/* Card_info will be freed when destroying front_info->xb_dev->dev. */
|
||||
card_info->card = NULL;
|
||||
}
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
/* 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_ALSA_H
|
||||
#define __XEN_SND_FRONT_ALSA_H
|
||||
|
||||
struct xen_snd_front_info;
|
||||
|
||||
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info);
|
||||
|
||||
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info);
|
||||
|
||||
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
|
||||
u64 pos_bytes);
|
||||
|
||||
#endif /* __XEN_SND_FRONT_ALSA_H */
|
||||
|
|
@ -14,6 +14,7 @@
|
|||
#include <xen/xenbus.h>
|
||||
|
||||
#include "xen_snd_front.h"
|
||||
#include "xen_snd_front_alsa.h"
|
||||
#include "xen_snd_front_cfg.h"
|
||||
#include "xen_snd_front_evtchnl.h"
|
||||
|
||||
|
|
@ -118,7 +119,8 @@ static irqreturn_t evtchnl_interrupt_evt(int irq, void *dev_id)
|
|||
|
||||
switch (event->type) {
|
||||
case XENSND_EVT_CUR_POS:
|
||||
/* Do nothing at the moment. */
|
||||
xen_snd_front_alsa_handle_cur_pos(channel,
|
||||
event->op.cur_pos.position);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue