tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
Oleksandr Andrushchenko
and committed by
Takashi Iwai
1cee5593
d6e0fbb8
+1056
-3
+2
-1
sound/xen/Makefile
+2
-1
sound/xen/Makefile
+180
-1
sound/xen/xen_snd_front.c
+180
-1
sound/xen/xen_snd_front.c
···
19
19
#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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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···
224
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static int sndback_connect(struct xen_snd_front_info *front_info)
226
47
{
227
-
return 0;
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return xen_snd_front_alsa_init(front_info);
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49
}
229
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static void sndback_disconnect(struct xen_snd_front_info *front_info)
+27
sound/xen/xen_snd_front.h
+27
sound/xen/xen_snd_front.h
···
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#include "xen_snd_front_cfg.h"
15
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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;
17
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18
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struct xen_snd_front_info {
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struct xenbus_device *xb_dev;
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25
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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;
25
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};
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int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
34
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struct xensnd_query_hw_param *hw_param_req,
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struct xensnd_query_hw_param *hw_param_resp);
36
+
37
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int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
38
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struct xen_snd_front_shbuf *sh_buf,
39
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u8 format, unsigned int channels,
40
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unsigned int rate, u32 buffer_sz,
41
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u32 period_sz);
42
+
43
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int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
44
+
45
+
int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
46
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unsigned long pos, unsigned long count);
47
+
48
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int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
49
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unsigned long pos, unsigned long count);
50
+
51
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int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
52
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int type);
26
53
27
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#endif /* __XEN_SND_FRONT_H */
+821
sound/xen/xen_snd_front_alsa.c
+821
sound/xen/xen_snd_front_alsa.c
···
1
+
// SPDX-License-Identifier: GPL-2.0 OR MIT
2
+
3
+
/*
4
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* Xen para-virtual sound device
5
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*
6
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* Copyright (C) 2016-2018 EPAM Systems Inc.
7
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*
8
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* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
9
+
*/
10
+
11
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#include <linux/platform_device.h>
12
+
13
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#include <sound/core.h>
14
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#include <sound/pcm.h>
15
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#include <sound/pcm_params.h>
16
+
17
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#include <xen/xenbus.h>
18
+
19
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#include "xen_snd_front.h"
20
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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"
24
+
25
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struct xen_snd_front_pcm_stream_info {
26
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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;
30
+
31
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bool is_open;
32
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struct snd_pcm_hardware pcm_hw;
33
+
34
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/* Number of processed frames as reported by the backend. */
35
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snd_pcm_uframes_t be_cur_frame;
36
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/* Current HW pointer to be reported via .period callback. */
37
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atomic_t hw_ptr;
38
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/* Modulo of the number of processed frames - for period detection. */
39
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u32 out_frames;
40
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};
41
+
42
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struct xen_snd_front_pcm_instance_info {
43
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struct xen_snd_front_card_info *card_info;
44
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struct snd_pcm *pcm;
45
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struct snd_pcm_hardware pcm_hw;
46
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int num_pcm_streams_pb;
47
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struct xen_snd_front_pcm_stream_info *streams_pb;
48
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int num_pcm_streams_cap;
49
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struct xen_snd_front_pcm_stream_info *streams_cap;
50
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};
51
+
52
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struct xen_snd_front_card_info {
53
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struct xen_snd_front_info *front_info;
54
+
struct snd_card *card;
55
+
struct snd_pcm_hardware pcm_hw;
56
+
int num_pcm_instances;
57
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struct xen_snd_front_pcm_instance_info *pcm_instances;
58
+
};
59
+
60
+
struct alsa_sndif_sample_format {
61
+
u8 sndif;
62
+
snd_pcm_format_t alsa;
63
+
};
64
+
65
+
struct alsa_sndif_hw_param {
66
+
u8 sndif;
67
+
snd_pcm_hw_param_t alsa;
68
+
};
69
+
70
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static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = {
71
+
{
72
+
.sndif = XENSND_PCM_FORMAT_U8,
73
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.alsa = SNDRV_PCM_FORMAT_U8
74
+
},
75
+
{
76
+
.sndif = XENSND_PCM_FORMAT_S8,
77
+
.alsa = SNDRV_PCM_FORMAT_S8
78
+
},
79
+
{
80
+
.sndif = XENSND_PCM_FORMAT_U16_LE,
81
+
.alsa = SNDRV_PCM_FORMAT_U16_LE
82
+
},
83
+
{
84
+
.sndif = XENSND_PCM_FORMAT_U16_BE,
85
+
.alsa = SNDRV_PCM_FORMAT_U16_BE
86
+
},
87
+
{
88
+
.sndif = XENSND_PCM_FORMAT_S16_LE,
89
+
.alsa = SNDRV_PCM_FORMAT_S16_LE
90
+
},
91
+
{
92
+
.sndif = XENSND_PCM_FORMAT_S16_BE,
93
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.alsa = SNDRV_PCM_FORMAT_S16_BE
94
+
},
95
+
{
96
+
.sndif = XENSND_PCM_FORMAT_U24_LE,
97
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.alsa = SNDRV_PCM_FORMAT_U24_LE
98
+
},
99
+
{
100
+
.sndif = XENSND_PCM_FORMAT_U24_BE,
101
+
.alsa = SNDRV_PCM_FORMAT_U24_BE
102
+
},
103
+
{
104
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.sndif = XENSND_PCM_FORMAT_S24_LE,
105
+
.alsa = SNDRV_PCM_FORMAT_S24_LE
106
+
},
107
+
{
108
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.sndif = XENSND_PCM_FORMAT_S24_BE,
109
+
.alsa = SNDRV_PCM_FORMAT_S24_BE
110
+
},
111
+
{
112
+
.sndif = XENSND_PCM_FORMAT_U32_LE,
113
+
.alsa = SNDRV_PCM_FORMAT_U32_LE
114
+
},
115
+
{
116
+
.sndif = XENSND_PCM_FORMAT_U32_BE,
117
+
.alsa = SNDRV_PCM_FORMAT_U32_BE
118
+
},
119
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{
120
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.sndif = XENSND_PCM_FORMAT_S32_LE,
121
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.alsa = SNDRV_PCM_FORMAT_S32_LE
122
+
},
123
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{
124
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.sndif = XENSND_PCM_FORMAT_S32_BE,
125
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.alsa = SNDRV_PCM_FORMAT_S32_BE
126
+
},
127
+
{
128
+
.sndif = XENSND_PCM_FORMAT_A_LAW,
129
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.alsa = SNDRV_PCM_FORMAT_A_LAW
130
+
},
131
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{
132
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.sndif = XENSND_PCM_FORMAT_MU_LAW,
133
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.alsa = SNDRV_PCM_FORMAT_MU_LAW
134
+
},
135
+
{
136
+
.sndif = XENSND_PCM_FORMAT_F32_LE,
137
+
.alsa = SNDRV_PCM_FORMAT_FLOAT_LE
138
+
},
139
+
{
140
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.sndif = XENSND_PCM_FORMAT_F32_BE,
141
+
.alsa = SNDRV_PCM_FORMAT_FLOAT_BE
142
+
},
143
+
{
144
+
.sndif = XENSND_PCM_FORMAT_F64_LE,
145
+
.alsa = SNDRV_PCM_FORMAT_FLOAT64_LE
146
+
},
147
+
{
148
+
.sndif = XENSND_PCM_FORMAT_F64_BE,
149
+
.alsa = SNDRV_PCM_FORMAT_FLOAT64_BE
150
+
},
151
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{
152
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE,
153
+
.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
154
+
},
155
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{
156
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.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE,
157
+
.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE
158
+
},
159
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{
160
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.sndif = XENSND_PCM_FORMAT_IMA_ADPCM,
161
+
.alsa = SNDRV_PCM_FORMAT_IMA_ADPCM
162
+
},
163
+
{
164
+
.sndif = XENSND_PCM_FORMAT_MPEG,
165
+
.alsa = SNDRV_PCM_FORMAT_MPEG
166
+
},
167
+
{
168
+
.sndif = XENSND_PCM_FORMAT_GSM,
169
+
.alsa = SNDRV_PCM_FORMAT_GSM
170
+
},
171
+
};
172
+
173
+
static int to_sndif_format(snd_pcm_format_t format)
174
+
{
175
+
int i;
176
+
177
+
for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
178
+
if (ALSA_SNDIF_FORMATS[i].alsa == format)
179
+
return ALSA_SNDIF_FORMATS[i].sndif;
180
+
181
+
return -EINVAL;
182
+
}
183
+
184
+
static u64 to_sndif_formats_mask(u64 alsa_formats)
185
+
{
186
+
u64 mask;
187
+
int i;
188
+
189
+
mask = 0;
190
+
for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
191
+
if (1 << ALSA_SNDIF_FORMATS[i].alsa & alsa_formats)
192
+
mask |= 1 << ALSA_SNDIF_FORMATS[i].sndif;
193
+
194
+
return mask;
195
+
}
196
+
197
+
static u64 to_alsa_formats_mask(u64 sndif_formats)
198
+
{
199
+
u64 mask;
200
+
int i;
201
+
202
+
mask = 0;
203
+
for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
204
+
if (1 << ALSA_SNDIF_FORMATS[i].sndif & sndif_formats)
205
+
mask |= 1 << ALSA_SNDIF_FORMATS[i].alsa;
206
+
207
+
return mask;
208
+
}
209
+
210
+
static void stream_clear(struct xen_snd_front_pcm_stream_info *stream)
211
+
{
212
+
stream->is_open = false;
213
+
stream->be_cur_frame = 0;
214
+
stream->out_frames = 0;
215
+
atomic_set(&stream->hw_ptr, 0);
216
+
xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
217
+
xen_snd_front_shbuf_clear(&stream->sh_buf);
218
+
}
219
+
220
+
static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
221
+
{
222
+
xen_snd_front_shbuf_free(&stream->sh_buf);
223
+
stream_clear(stream);
224
+
}
225
+
226
+
static struct xen_snd_front_pcm_stream_info *
227
+
stream_get(struct snd_pcm_substream *substream)
228
+
{
229
+
struct xen_snd_front_pcm_instance_info *pcm_instance =
230
+
snd_pcm_substream_chip(substream);
231
+
struct xen_snd_front_pcm_stream_info *stream;
232
+
233
+
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
234
+
stream = &pcm_instance->streams_pb[substream->number];
235
+
else
236
+
stream = &pcm_instance->streams_cap[substream->number];
237
+
238
+
return stream;
239
+
}
240
+
241
+
static int alsa_hw_rule(struct snd_pcm_hw_params *params,
242
+
struct snd_pcm_hw_rule *rule)
243
+
{
244
+
struct xen_snd_front_pcm_stream_info *stream = rule->private;
245
+
struct device *dev = &stream->front_info->xb_dev->dev;
246
+
struct snd_mask *formats =
247
+
hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
248
+
struct snd_interval *rates =
249
+
hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
250
+
struct snd_interval *channels =
251
+
hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
252
+
struct snd_interval *period =
253
+
hw_param_interval(params,
254
+
SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
255
+
struct snd_interval *buffer =
256
+
hw_param_interval(params,
257
+
SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
258
+
struct xensnd_query_hw_param req;
259
+
struct xensnd_query_hw_param resp;
260
+
struct snd_interval interval;
261
+
struct snd_mask mask;
262
+
u64 sndif_formats;
263
+
int changed, ret;
264
+
265
+
/* Collect all the values we need for the query. */
266
+
267
+
req.formats = to_sndif_formats_mask((u64)formats->bits[0] |
268
+
(u64)(formats->bits[1]) << 32);
269
+
270
+
req.rates.min = rates->min;
271
+
req.rates.max = rates->max;
272
+
273
+
req.channels.min = channels->min;
274
+
req.channels.max = channels->max;
275
+
276
+
req.buffer.min = buffer->min;
277
+
req.buffer.max = buffer->max;
278
+
279
+
req.period.min = period->min;
280
+
req.period.max = period->max;
281
+
282
+
ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req,
283
+
&req, &resp);
284
+
if (ret < 0) {
285
+
/* Check if this is due to backend communication error. */
286
+
if (ret == -EIO || ret == -ETIMEDOUT)
287
+
dev_err(dev, "Failed to query ALSA HW parameters\n");
288
+
return ret;
289
+
}
290
+
291
+
/* Refine HW parameters after the query. */
292
+
changed = 0;
293
+
294
+
sndif_formats = to_alsa_formats_mask(resp.formats);
295
+
snd_mask_none(&mask);
296
+
mask.bits[0] = (u32)sndif_formats;
297
+
mask.bits[1] = (u32)(sndif_formats >> 32);
298
+
ret = snd_mask_refine(formats, &mask);
299
+
if (ret < 0)
300
+
return ret;
301
+
changed |= ret;
302
+
303
+
interval.openmin = 0;
304
+
interval.openmax = 0;
305
+
interval.integer = 1;
306
+
307
+
interval.min = resp.rates.min;
308
+
interval.max = resp.rates.max;
309
+
ret = snd_interval_refine(rates, &interval);
310
+
if (ret < 0)
311
+
return ret;
312
+
changed |= ret;
313
+
314
+
interval.min = resp.channels.min;
315
+
interval.max = resp.channels.max;
316
+
ret = snd_interval_refine(channels, &interval);
317
+
if (ret < 0)
318
+
return ret;
319
+
changed |= ret;
320
+
321
+
interval.min = resp.buffer.min;
322
+
interval.max = resp.buffer.max;
323
+
ret = snd_interval_refine(buffer, &interval);
324
+
if (ret < 0)
325
+
return ret;
326
+
changed |= ret;
327
+
328
+
interval.min = resp.period.min;
329
+
interval.max = resp.period.max;
330
+
ret = snd_interval_refine(period, &interval);
331
+
if (ret < 0)
332
+
return ret;
333
+
changed |= ret;
334
+
335
+
return changed;
336
+
}
337
+
338
+
static int alsa_open(struct snd_pcm_substream *substream)
339
+
{
340
+
struct xen_snd_front_pcm_instance_info *pcm_instance =
341
+
snd_pcm_substream_chip(substream);
342
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
343
+
struct snd_pcm_runtime *runtime = substream->runtime;
344
+
struct xen_snd_front_info *front_info =
345
+
pcm_instance->card_info->front_info;
346
+
struct device *dev = &front_info->xb_dev->dev;
347
+
int ret;
348
+
349
+
/*
350
+
* Return our HW properties: override defaults with those configured
351
+
* via XenStore.
352
+
*/
353
+
runtime->hw = stream->pcm_hw;
354
+
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
355
+
SNDRV_PCM_INFO_MMAP_VALID |
356
+
SNDRV_PCM_INFO_DOUBLE |
357
+
SNDRV_PCM_INFO_BATCH |
358
+
SNDRV_PCM_INFO_NONINTERLEAVED |
359
+
SNDRV_PCM_INFO_RESUME |
360
+
SNDRV_PCM_INFO_PAUSE);
361
+
runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED;
362
+
363
+
stream->evt_pair = &front_info->evt_pairs[stream->index];
364
+
365
+
stream->front_info = front_info;
366
+
367
+
stream->evt_pair->evt.u.evt.substream = substream;
368
+
369
+
stream_clear(stream);
370
+
371
+
xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true);
372
+
373
+
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
374
+
alsa_hw_rule, stream,
375
+
SNDRV_PCM_HW_PARAM_FORMAT, -1);
376
+
if (ret) {
377
+
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n");
378
+
return ret;
379
+
}
380
+
381
+
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
382
+
alsa_hw_rule, stream,
383
+
SNDRV_PCM_HW_PARAM_RATE, -1);
384
+
if (ret) {
385
+
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n");
386
+
return ret;
387
+
}
388
+
389
+
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
390
+
alsa_hw_rule, stream,
391
+
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
392
+
if (ret) {
393
+
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n");
394
+
return ret;
395
+
}
396
+
397
+
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
398
+
alsa_hw_rule, stream,
399
+
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
400
+
if (ret) {
401
+
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n");
402
+
return ret;
403
+
}
404
+
405
+
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
406
+
alsa_hw_rule, stream,
407
+
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
408
+
if (ret) {
409
+
dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n");
410
+
return ret;
411
+
}
412
+
413
+
return 0;
414
+
}
415
+
416
+
static int alsa_close(struct snd_pcm_substream *substream)
417
+
{
418
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
419
+
420
+
xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false);
421
+
return 0;
422
+
}
423
+
424
+
static int alsa_hw_params(struct snd_pcm_substream *substream,
425
+
struct snd_pcm_hw_params *params)
426
+
{
427
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
428
+
int ret;
429
+
430
+
/*
431
+
* This callback may be called multiple times,
432
+
* so free the previously allocated shared buffer if any.
433
+
*/
434
+
stream_free(stream);
435
+
436
+
ret = xen_snd_front_shbuf_alloc(stream->front_info->xb_dev,
437
+
&stream->sh_buf,
438
+
params_buffer_bytes(params));
439
+
if (ret < 0) {
440
+
stream_free(stream);
441
+
dev_err(&stream->front_info->xb_dev->dev,
442
+
"Failed to allocate buffers for stream with index %d\n",
443
+
stream->index);
444
+
return ret;
445
+
}
446
+
447
+
return 0;
448
+
}
449
+
450
+
static int alsa_hw_free(struct snd_pcm_substream *substream)
451
+
{
452
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
453
+
int ret;
454
+
455
+
ret = xen_snd_front_stream_close(&stream->evt_pair->req);
456
+
stream_free(stream);
457
+
return ret;
458
+
}
459
+
460
+
static int alsa_prepare(struct snd_pcm_substream *substream)
461
+
{
462
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
463
+
464
+
if (!stream->is_open) {
465
+
struct snd_pcm_runtime *runtime = substream->runtime;
466
+
u8 sndif_format;
467
+
int ret;
468
+
469
+
sndif_format = to_sndif_format(runtime->format);
470
+
if (sndif_format < 0) {
471
+
dev_err(&stream->front_info->xb_dev->dev,
472
+
"Unsupported sample format: %d\n",
473
+
runtime->format);
474
+
return sndif_format;
475
+
}
476
+
477
+
ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
478
+
&stream->sh_buf,
479
+
sndif_format,
480
+
runtime->channels,
481
+
runtime->rate,
482
+
snd_pcm_lib_buffer_bytes(substream),
483
+
snd_pcm_lib_period_bytes(substream));
484
+
if (ret < 0)
485
+
return ret;
486
+
487
+
stream->is_open = true;
488
+
}
489
+
490
+
return 0;
491
+
}
492
+
493
+
static int alsa_trigger(struct snd_pcm_substream *substream, int cmd)
494
+
{
495
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
496
+
int type;
497
+
498
+
switch (cmd) {
499
+
case SNDRV_PCM_TRIGGER_START:
500
+
type = XENSND_OP_TRIGGER_START;
501
+
break;
502
+
503
+
case SNDRV_PCM_TRIGGER_RESUME:
504
+
type = XENSND_OP_TRIGGER_RESUME;
505
+
break;
506
+
507
+
case SNDRV_PCM_TRIGGER_STOP:
508
+
type = XENSND_OP_TRIGGER_STOP;
509
+
break;
510
+
511
+
case SNDRV_PCM_TRIGGER_SUSPEND:
512
+
type = XENSND_OP_TRIGGER_PAUSE;
513
+
break;
514
+
515
+
default:
516
+
return -EINVAL;
517
+
}
518
+
519
+
return xen_snd_front_stream_trigger(&stream->evt_pair->req, type);
520
+
}
521
+
522
+
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
523
+
u64 pos_bytes)
524
+
{
525
+
struct snd_pcm_substream *substream = evtchnl->u.evt.substream;
526
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
527
+
snd_pcm_uframes_t delta, new_hw_ptr, cur_frame;
528
+
529
+
cur_frame = bytes_to_frames(substream->runtime, pos_bytes);
530
+
531
+
delta = cur_frame - stream->be_cur_frame;
532
+
stream->be_cur_frame = cur_frame;
533
+
534
+
new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
535
+
new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size;
536
+
atomic_set(&stream->hw_ptr, (int)new_hw_ptr);
537
+
538
+
stream->out_frames += delta;
539
+
if (stream->out_frames > substream->runtime->period_size) {
540
+
stream->out_frames %= substream->runtime->period_size;
541
+
snd_pcm_period_elapsed(substream);
542
+
}
543
+
}
544
+
545
+
static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream)
546
+
{
547
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
548
+
549
+
return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
550
+
}
551
+
552
+
static int alsa_pb_copy_user(struct snd_pcm_substream *substream,
553
+
int channel, unsigned long pos, void __user *src,
554
+
unsigned long count)
555
+
{
556
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
557
+
558
+
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
559
+
return -EINVAL;
560
+
561
+
if (copy_from_user(stream->sh_buf.buffer + pos, src, count))
562
+
return -EFAULT;
563
+
564
+
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
565
+
}
566
+
567
+
static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream,
568
+
int channel, unsigned long pos, void *src,
569
+
unsigned long count)
570
+
{
571
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
572
+
573
+
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
574
+
return -EINVAL;
575
+
576
+
memcpy(stream->sh_buf.buffer + pos, src, count);
577
+
578
+
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
579
+
}
580
+
581
+
static int alsa_cap_copy_user(struct snd_pcm_substream *substream,
582
+
int channel, unsigned long pos, void __user *dst,
583
+
unsigned long count)
584
+
{
585
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
586
+
int ret;
587
+
588
+
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
589
+
return -EINVAL;
590
+
591
+
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
592
+
if (ret < 0)
593
+
return ret;
594
+
595
+
return copy_to_user(dst, stream->sh_buf.buffer + pos, count) ?
596
+
-EFAULT : 0;
597
+
}
598
+
599
+
static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream,
600
+
int channel, unsigned long pos, void *dst,
601
+
unsigned long count)
602
+
{
603
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
604
+
int ret;
605
+
606
+
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
607
+
return -EINVAL;
608
+
609
+
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
610
+
if (ret < 0)
611
+
return ret;
612
+
613
+
memcpy(dst, stream->sh_buf.buffer + pos, count);
614
+
615
+
return 0;
616
+
}
617
+
618
+
static int alsa_pb_fill_silence(struct snd_pcm_substream *substream,
619
+
int channel, unsigned long pos,
620
+
unsigned long count)
621
+
{
622
+
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
623
+
624
+
if (unlikely(pos + count > stream->sh_buf.buffer_sz))
625
+
return -EINVAL;
626
+
627
+
memset(stream->sh_buf.buffer + pos, 0, count);
628
+
629
+
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
630
+
}
631
+
632
+
/*
633
+
* FIXME: The mmaped data transfer is asynchronous and there is no
634
+
* ack signal from user-space when it is done. This is the
635
+
* reason it is not implemented in the PV driver as we do need
636
+
* to know when the buffer can be transferred to the backend.
637
+
*/
638
+
639
+
static struct snd_pcm_ops snd_drv_alsa_playback_ops = {
640
+
.open = alsa_open,
641
+
.close = alsa_close,
642
+
.ioctl = snd_pcm_lib_ioctl,
643
+
.hw_params = alsa_hw_params,
644
+
.hw_free = alsa_hw_free,
645
+
.prepare = alsa_prepare,
646
+
.trigger = alsa_trigger,
647
+
.pointer = alsa_pointer,
648
+
.copy_user = alsa_pb_copy_user,
649
+
.copy_kernel = alsa_pb_copy_kernel,
650
+
.fill_silence = alsa_pb_fill_silence,
651
+
};
652
+
653
+
static struct snd_pcm_ops snd_drv_alsa_capture_ops = {
654
+
.open = alsa_open,
655
+
.close = alsa_close,
656
+
.ioctl = snd_pcm_lib_ioctl,
657
+
.hw_params = alsa_hw_params,
658
+
.hw_free = alsa_hw_free,
659
+
.prepare = alsa_prepare,
660
+
.trigger = alsa_trigger,
661
+
.pointer = alsa_pointer,
662
+
.copy_user = alsa_cap_copy_user,
663
+
.copy_kernel = alsa_cap_copy_kernel,
664
+
};
665
+
666
+
static int new_pcm_instance(struct xen_snd_front_card_info *card_info,
667
+
struct xen_front_cfg_pcm_instance *instance_cfg,
668
+
struct xen_snd_front_pcm_instance_info *pcm_instance_info)
669
+
{
670
+
struct snd_pcm *pcm;
671
+
int ret, i;
672
+
673
+
dev_dbg(&card_info->front_info->xb_dev->dev,
674
+
"New PCM device \"%s\" with id %d playback %d capture %d",
675
+
instance_cfg->name,
676
+
instance_cfg->device_id,
677
+
instance_cfg->num_streams_pb,
678
+
instance_cfg->num_streams_cap);
679
+
680
+
pcm_instance_info->card_info = card_info;
681
+
682
+
pcm_instance_info->pcm_hw = instance_cfg->pcm_hw;
683
+
684
+
if (instance_cfg->num_streams_pb) {
685
+
pcm_instance_info->streams_pb =
686
+
devm_kcalloc(&card_info->card->card_dev,
687
+
instance_cfg->num_streams_pb,
688
+
sizeof(struct xen_snd_front_pcm_stream_info),
689
+
GFP_KERNEL);
690
+
if (!pcm_instance_info->streams_pb)
691
+
return -ENOMEM;
692
+
}
693
+
694
+
if (instance_cfg->num_streams_cap) {
695
+
pcm_instance_info->streams_cap =
696
+
devm_kcalloc(&card_info->card->card_dev,
697
+
instance_cfg->num_streams_cap,
698
+
sizeof(struct xen_snd_front_pcm_stream_info),
699
+
GFP_KERNEL);
700
+
if (!pcm_instance_info->streams_cap)
701
+
return -ENOMEM;
702
+
}
703
+
704
+
pcm_instance_info->num_pcm_streams_pb =
705
+
instance_cfg->num_streams_pb;
706
+
pcm_instance_info->num_pcm_streams_cap =
707
+
instance_cfg->num_streams_cap;
708
+
709
+
for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) {
710
+
pcm_instance_info->streams_pb[i].pcm_hw =
711
+
instance_cfg->streams_pb[i].pcm_hw;
712
+
pcm_instance_info->streams_pb[i].index =
713
+
instance_cfg->streams_pb[i].index;
714
+
}
715
+
716
+
for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) {
717
+
pcm_instance_info->streams_cap[i].pcm_hw =
718
+
instance_cfg->streams_cap[i].pcm_hw;
719
+
pcm_instance_info->streams_cap[i].index =
720
+
instance_cfg->streams_cap[i].index;
721
+
}
722
+
723
+
ret = snd_pcm_new(card_info->card, instance_cfg->name,
724
+
instance_cfg->device_id,
725
+
instance_cfg->num_streams_pb,
726
+
instance_cfg->num_streams_cap,
727
+
&pcm);
728
+
if (ret < 0)
729
+
return ret;
730
+
731
+
pcm->private_data = pcm_instance_info;
732
+
pcm->info_flags = 0;
733
+
/* we want to handle all PCM operations in non-atomic context */
734
+
pcm->nonatomic = true;
735
+
strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name));
736
+
737
+
if (instance_cfg->num_streams_pb)
738
+
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
739
+
&snd_drv_alsa_playback_ops);
740
+
741
+
if (instance_cfg->num_streams_cap)
742
+
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
743
+
&snd_drv_alsa_capture_ops);
744
+
745
+
pcm_instance_info->pcm = pcm;
746
+
return 0;
747
+
}
748
+
749
+
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info)
750
+
{
751
+
struct device *dev = &front_info->xb_dev->dev;
752
+
struct xen_front_cfg_card *cfg = &front_info->cfg;
753
+
struct xen_snd_front_card_info *card_info;
754
+
struct snd_card *card;
755
+
int ret, i;
756
+
757
+
dev_dbg(dev, "Creating virtual sound card\n");
758
+
759
+
ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE,
760
+
sizeof(struct xen_snd_front_card_info), &card);
761
+
if (ret < 0)
762
+
return ret;
763
+
764
+
card_info = card->private_data;
765
+
card_info->front_info = front_info;
766
+
front_info->card_info = card_info;
767
+
card_info->card = card;
768
+
card_info->pcm_instances =
769
+
devm_kcalloc(dev, cfg->num_pcm_instances,
770
+
sizeof(struct xen_snd_front_pcm_instance_info),
771
+
GFP_KERNEL);
772
+
if (!card_info->pcm_instances) {
773
+
ret = -ENOMEM;
774
+
goto fail;
775
+
}
776
+
777
+
card_info->num_pcm_instances = cfg->num_pcm_instances;
778
+
card_info->pcm_hw = cfg->pcm_hw;
779
+
780
+
for (i = 0; i < cfg->num_pcm_instances; i++) {
781
+
ret = new_pcm_instance(card_info, &cfg->pcm_instances[i],
782
+
&card_info->pcm_instances[i]);
783
+
if (ret < 0)
784
+
goto fail;
785
+
}
786
+
787
+
strncpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver));
788
+
strncpy(card->shortname, cfg->name_short, sizeof(card->shortname));
789
+
strncpy(card->longname, cfg->name_long, sizeof(card->longname));
790
+
791
+
ret = snd_card_register(card);
792
+
if (ret < 0)
793
+
goto fail;
794
+
795
+
return 0;
796
+
797
+
fail:
798
+
snd_card_free(card);
799
+
return ret;
800
+
}
801
+
802
+
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info)
803
+
{
804
+
struct xen_snd_front_card_info *card_info;
805
+
struct snd_card *card;
806
+
807
+
card_info = front_info->card_info;
808
+
if (!card_info)
809
+
return;
810
+
811
+
card = card_info->card;
812
+
if (!card)
813
+
return;
814
+
815
+
dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n",
816
+
card->number);
817
+
snd_card_free(card);
818
+
819
+
/* Card_info will be freed when destroying front_info->xb_dev->dev. */
820
+
card_info->card = NULL;
821
+
}
+23
sound/xen/xen_snd_front_alsa.h
+23
sound/xen/xen_snd_front_alsa.h
···
1
+
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2
+
3
+
/*
4
+
* Xen para-virtual sound device
5
+
*
6
+
* Copyright (C) 2016-2018 EPAM Systems Inc.
7
+
*
8
+
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
9
+
*/
10
+
11
+
#ifndef __XEN_SND_FRONT_ALSA_H
12
+
#define __XEN_SND_FRONT_ALSA_H
13
+
14
+
struct xen_snd_front_info;
15
+
16
+
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info);
17
+
18
+
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info);
19
+
20
+
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
21
+
u64 pos_bytes);
22
+
23
+
#endif /* __XEN_SND_FRONT_ALSA_H */
+3
-1
sound/xen/xen_snd_front_evtchnl.c
+3
-1
sound/xen/xen_snd_front_evtchnl.c
···
14
14
#include <xen/xenbus.h>
15
15
16
16
#include "xen_snd_front.h"
17
+
#include "xen_snd_front_alsa.h"
17
18
#include "xen_snd_front_cfg.h"
18
19
#include "xen_snd_front_evtchnl.h"
19
20
···
119
118
120
119
switch (event->type) {
121
120
case XENSND_EVT_CUR_POS:
122
-
/* Do nothing at the moment. */
121
+
xen_snd_front_alsa_handle_cur_pos(channel,
122
+
event->op.cur_pos.position);
123
123
break;
124
124
}
125
125
}