Date: Tue, 27 Dec 2016 19:08:08 +0000 (UTC) From: Oleksandr Tymoshenko <gonzo@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r310636 - head/sys/arm/broadcom/bcm2835 Message-ID: <201612271908.uBRJ88DE046230@repo.freebsd.org>
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Author: gonzo Date: Tue Dec 27 19:08:08 2016 New Revision: 310636 URL: https://svnweb.freebsd.org/changeset/base/310636 Log: [rpi] Fix bcm2835_audio locking and samples starvation Rework general approach to locking and working with audio worker thread: - Use flags to signal requested worker action - Fix submitted buffer calculations to avoid samples starvation - Protect buffer pointers with locks to fix race condition between callback and audio worker thread - Remove unnecessary vchi_service_use - Do not use lock to serialize VCHI requests since only one thread issues them now - Fix unloading signaling per hselasky@ suggestion - Add output to detect inconsistent callback data caused by possible firmware bug https://github.com/raspberrypi/firmware/issues/696 - Add stats/debug sysctls to troubleshoot possible bugs PR: 213687, 205979, 215194 MFC after: 1 week Modified: head/sys/arm/broadcom/bcm2835/bcm2835_audio.c Modified: head/sys/arm/broadcom/bcm2835/bcm2835_audio.c ============================================================================== --- head/sys/arm/broadcom/bcm2835/bcm2835_audio.c Tue Dec 27 18:23:16 2016 (r310635) +++ head/sys/arm/broadcom/bcm2835/bcm2835_audio.c Tue Dec 27 19:08:08 2016 (r310636) @@ -40,13 +40,33 @@ SND_DECLARE_FILE("$FreeBSD$"); +/* Audio destination */ #define DEST_AUTO 0 #define DEST_HEADPHONES 1 #define DEST_HDMI 2 +/* Playback state */ +#define PLAYBACK_IDLE 0 +#define PLAYBACK_PLAYING 1 +#define PLAYBACK_STOPPING 2 + +/* Worker thread state */ +#define WORKER_RUNNING 0 +#define WORKER_STOPPING 1 +#define WORKER_STOPPED 2 + +/* + * Worker thread flags, set to 1 in flags_pending + * when driver requests one or another operation + * from worker. Cleared to 0 once worker performs + * the operations. + */ +#define AUDIO_PARAMS (1 << 0) +#define AUDIO_PLAY (1 << 1) +#define AUDIO_STOP (1 << 2) + #define VCHIQ_AUDIO_PACKET_SIZE 4000 -#define VCHIQ_AUDIO_BUFFER_SIZE 128000 -#define VCHIQ_AUDIO_PREBUFFER 10 /* Number of pre-buffered audio messages */ +#define VCHIQ_AUDIO_BUFFER_SIZE 10*VCHIQ_AUDIO_PACKET_SIZE #define VCHIQ_AUDIO_MAX_VOLUME /* volume in terms of 0.01dB */ @@ -77,22 +97,25 @@ static struct pcmchan_caps bcm2835_audio struct bcm2835_audio_info; -#define PLAYBACK_IDLE 0 -#define PLAYBACK_STARTING 1 -#define PLAYBACK_PLAYING 2 -#define PLAYBACK_STOPPING 3 - struct bcm2835_audio_chinfo { struct bcm2835_audio_info *parent; struct pcm_channel *channel; struct snd_dbuf *buffer; uint32_t fmt, spd, blksz; - uint32_t complete_pos; - uint32_t free_buffer; - uint32_t buffered_ptr; + /* Pointer to first unsubmitted sample */ + uint32_t unsubmittedptr; + /* + * Number of bytes in "submitted but not played" + * pseudo-buffer + */ + int available_space; int playback_state; - int prebuffered; + uint64_t callbacks; + uint64_t submitted_samples; + uint64_t retrieved_samples; + uint64_t underruns; + int starved; }; struct bcm2835_audio_info { @@ -100,32 +123,25 @@ struct bcm2835_audio_info { unsigned int bufsz; struct bcm2835_audio_chinfo pch; uint32_t dest, volume; - struct mtx *lock; struct intr_config_hook intr_hook; /* VCHI data */ - struct sx vchi_lock; - VCHI_INSTANCE_T vchi_instance; VCHI_CONNECTION_T *vchi_connection; VCHI_SERVICE_HANDLE_T vchi_handle; - struct sx worker_lock; + struct mtx lock; struct cv worker_cv; - bool parameters_update_pending; - bool controls_update_pending; + uint32_t flags_pending; - /* Unloadign module */ - int unloading; + /* Worker thread state */ + int worker_state; }; -#define bcm2835_audio_lock(_ess) snd_mtxlock((_ess)->lock) -#define bcm2835_audio_unlock(_ess) snd_mtxunlock((_ess)->lock) -#define bcm2835_audio_lock_assert(_ess) snd_mtxassert((_ess)->lock) - -#define VCHIQ_VCHI_LOCK(sc) sx_xlock(&(sc)->vchi_lock) -#define VCHIQ_VCHI_UNLOCK(sc) sx_xunlock(&(sc)->vchi_lock) +#define BCM2835_AUDIO_LOCK(sc) mtx_lock(&(sc)->lock) +#define BCM2835_AUDIO_LOCKED(sc) mtx_assert(&(sc)->lock, MA_OWNED) +#define BCM2835_AUDIO_UNLOCK(sc) mtx_unlock(&(sc)->lock) static const char * dest_description(uint32_t dest) @@ -149,6 +165,36 @@ dest_description(uint32_t dest) } static void +bcm2835_worker_update_params(struct bcm2835_audio_info *sc) +{ + + BCM2835_AUDIO_LOCKED(sc); + + sc->flags_pending |= AUDIO_PARAMS; + cv_signal(&sc->worker_cv); +} + +static void +bcm2835_worker_play_start(struct bcm2835_audio_info *sc) +{ + BCM2835_AUDIO_LOCK(sc); + sc->flags_pending &= ~(AUDIO_STOP); + sc->flags_pending |= AUDIO_PLAY; + cv_signal(&sc->worker_cv); + BCM2835_AUDIO_UNLOCK(sc); +} + +static void +bcm2835_worker_play_stop(struct bcm2835_audio_info *sc) +{ + BCM2835_AUDIO_LOCK(sc); + sc->flags_pending &= ~(AUDIO_PLAY); + sc->flags_pending |= AUDIO_STOP; + cv_signal(&sc->worker_cv); + BCM2835_AUDIO_UNLOCK(sc); +} + +static void bcm2835_audio_callback(void *param, const VCHI_CALLBACK_REASON_T reason, void *msg_handle) { struct bcm2835_audio_info *sc = (struct bcm2835_audio_info *)param; @@ -163,7 +209,7 @@ bcm2835_audio_callback(void *param, cons &m, sizeof m, &msg_len, VCHI_FLAGS_NONE); if (m.type == VC_AUDIO_MSG_TYPE_RESULT) { if (m.u.result.success) { - device_printf(sc->dev, + device_printf(sc->dev, "msg type %08x failed\n", m.type); } @@ -172,13 +218,35 @@ bcm2835_audio_callback(void *param, cons int count = m.u.complete.count & 0xffff; int perr = (m.u.complete.count & (1U << 30)) != 0; - - ch->complete_pos = (ch->complete_pos + count) % sndbuf_getsize(ch->buffer); - ch->free_buffer += count; - chn_intr(sc->pch.channel); - - if (perr || ch->free_buffer >= VCHIQ_AUDIO_PACKET_SIZE) - cv_signal(&sc->worker_cv); + ch->callbacks++; + if (perr) + ch->underruns++; + + BCM2835_AUDIO_LOCK(sc); + if (ch->playback_state != PLAYBACK_IDLE) { + /* Prevent LOR */ + BCM2835_AUDIO_UNLOCK(sc); + chn_intr(sc->pch.channel); + BCM2835_AUDIO_LOCK(sc); + } + /* We should check again, state might have changed */ + if (ch->playback_state != PLAYBACK_IDLE) { + if (!perr) { + if ((ch->available_space + count)> VCHIQ_AUDIO_BUFFER_SIZE) { + device_printf(sc->dev, "inconsistent data in callback:\n"); + device_printf(sc->dev, "available_space == %d, count = %d, perr=%d\n", + ch->available_space, count, perr); + device_printf(sc->dev, + "retrieved_samples = %lld, submitted_samples = %lld\n", + ch->retrieved_samples, ch->submitted_samples); + } + ch->available_space += count; + ch->retrieved_samples += count; + } + if (perr || (ch->available_space >= VCHIQ_AUDIO_PACKET_SIZE)) + cv_signal(&sc->worker_cv); + } + BCM2835_AUDIO_UNLOCK(sc); } else printf("%s: unknown m.type: %d\n", __func__, m.type); } @@ -218,10 +286,7 @@ bcm2835_audio_init(struct bcm2835_audio_ status = vchi_service_open(sc->vchi_instance, ¶ms, &sc->vchi_handle); - if (status == 0) - /* Finished with the service for now */ - vchi_service_release(sc->vchi_handle); - else + if (status != 0) sc->vchi_handle = VCHIQ_SERVICE_HANDLE_INVALID; } @@ -231,10 +296,10 @@ bcm2835_audio_release(struct bcm2835_aud int success; if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); success = vchi_service_close(sc->vchi_handle); if (success != 0) printf("vchi_service_close failed: %d\n", success); + vchi_service_release(sc->vchi_handle); sc->vchi_handle = VCHIQ_SERVICE_HANDLE_INVALID; } @@ -244,12 +309,9 @@ bcm2835_audio_release(struct bcm2835_aud static void bcm2835_audio_reset_channel(struct bcm2835_audio_chinfo *ch) { - ch->free_buffer = VCHIQ_AUDIO_BUFFER_SIZE; - ch->playback_state = 0; - ch->buffered_ptr = 0; - ch->complete_pos = 0; - ch->prebuffered = 0; + ch->available_space = VCHIQ_AUDIO_BUFFER_SIZE; + ch->unsubmittedptr = 0; sndbuf_reset(ch->buffer); } @@ -260,21 +322,14 @@ bcm2835_audio_start(struct bcm2835_audio int ret; struct bcm2835_audio_info *sc = ch->parent; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); - m.type = VC_AUDIO_MSG_TYPE_START; ret = vchi_msg_queue(sc->vchi_handle, &m, sizeof m, VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL); if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - - vchi_service_release(sc->vchi_handle); } - VCHIQ_VCHI_UNLOCK(sc); - } static void @@ -284,10 +339,7 @@ bcm2835_audio_stop(struct bcm2835_audio_ int ret; struct bcm2835_audio_info *sc = ch->parent; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); - m.type = VC_AUDIO_MSG_TYPE_STOP; m.u.stop.draining = 0; @@ -296,10 +348,7 @@ bcm2835_audio_stop(struct bcm2835_audio_ if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - - vchi_service_release(sc->vchi_handle); } - VCHIQ_VCHI_UNLOCK(sc); } static void @@ -308,20 +357,14 @@ bcm2835_audio_open(struct bcm2835_audio_ VC_AUDIO_MSG_T m; int ret; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); - m.type = VC_AUDIO_MSG_TYPE_OPEN; ret = vchi_msg_queue(sc->vchi_handle, &m, sizeof m, VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL); if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - - vchi_service_release(sc->vchi_handle); } - VCHIQ_VCHI_UNLOCK(sc); } static void @@ -330,10 +373,7 @@ bcm2835_audio_update_controls(struct bcm VC_AUDIO_MSG_T m; int ret, db; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); - m.type = VC_AUDIO_MSG_TYPE_CONTROL; m.u.control.dest = dest; if (volume > 99) @@ -346,10 +386,7 @@ bcm2835_audio_update_controls(struct bcm if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - - vchi_service_release(sc->vchi_handle); } - VCHIQ_VCHI_UNLOCK(sc); } static void @@ -358,10 +395,7 @@ bcm2835_audio_update_params(struct bcm28 VC_AUDIO_MSG_T m; int ret; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle != VCHIQ_SERVICE_HANDLE_INVALID) { - vchi_service_use(sc->vchi_handle); - m.type = VC_AUDIO_MSG_TYPE_CONFIG; m.u.config.channels = AFMT_CHANNEL(fmt); m.u.config.samplerate = speed; @@ -372,76 +406,48 @@ bcm2835_audio_update_params(struct bcm28 if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - - vchi_service_release(sc->vchi_handle); } - VCHIQ_VCHI_UNLOCK(sc); } -static __inline uint32_t -vchiq_unbuffered_bytes(struct bcm2835_audio_chinfo *ch) +static bool +bcm2835_audio_buffer_should_sleep(struct bcm2835_audio_chinfo *ch) { - uint32_t size, ready, readyptr, readyend; - - size = sndbuf_getsize(ch->buffer); - readyptr = sndbuf_getreadyptr(ch->buffer); - ready = sndbuf_getready(ch->buffer); + + if (ch->playback_state != PLAYBACK_PLAYING) + return (true); - readyend = readyptr + ready; - /* Normal case */ - if (ch->buffered_ptr >= readyptr) { - if (readyend > ch->buffered_ptr) - return readyend - ch->buffered_ptr; - else - return 0; + /* Not enough data */ + if (sndbuf_getready(ch->buffer) < VCHIQ_AUDIO_PACKET_SIZE) { + printf("starve\n"); + ch->starved++; + return (true); } - else { /* buffered_ptr overflow */ - if (readyend > ch->buffered_ptr + size) - return readyend - ch->buffered_ptr - size; - else - return 0; + + /* Not enough free space */ + if (ch->available_space < VCHIQ_AUDIO_PACKET_SIZE) { + return (true); } + + return (false); } static void -bcm2835_audio_write_samples(struct bcm2835_audio_chinfo *ch) +bcm2835_audio_write_samples(struct bcm2835_audio_chinfo *ch, void *buf, uint32_t count) { struct bcm2835_audio_info *sc = ch->parent; VC_AUDIO_MSG_T m; - void *buf; - uint32_t count, size; int ret; - VCHIQ_VCHI_LOCK(sc); if (sc->vchi_handle == VCHIQ_SERVICE_HANDLE_INVALID) { - VCHIQ_VCHI_UNLOCK(sc); return; } - vchi_service_use(sc->vchi_handle); - - size = sndbuf_getsize(ch->buffer); - count = vchiq_unbuffered_bytes(ch); - buf = (uint8_t*)sndbuf_getbuf(ch->buffer) + ch->buffered_ptr; - - if (ch->buffered_ptr + count > size) - count = size - ch->buffered_ptr; - - if (count < VCHIQ_AUDIO_PACKET_SIZE) - goto done; - - count = min(count, ch->free_buffer); - count -= count % VCHIQ_AUDIO_PACKET_SIZE; - m.type = VC_AUDIO_MSG_TYPE_WRITE; m.u.write.count = count; m.u.write.max_packet = VCHIQ_AUDIO_PACKET_SIZE; m.u.write.callback = NULL; m.u.write.cookie = ch; - if (buf) - m.u.write.silence = 0; - else - m.u.write.silence = 1; + m.u.write.silence = 0; ret = vchi_msg_queue(sc->vchi_handle, &m, sizeof m, VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL); @@ -449,25 +455,16 @@ bcm2835_audio_write_samples(struct bcm28 if (ret != 0) printf("%s: vchi_msg_queue failed (err %d)\n", __func__, ret); - if (buf) { - while (count > 0) { - int bytes = MIN((int)m.u.write.max_packet, (int)count); - ch->free_buffer -= bytes; - ch->buffered_ptr += bytes; - ch->buffered_ptr = ch->buffered_ptr % size; - ret = vchi_msg_queue(sc->vchi_handle, - buf, bytes, VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL); - if (ret != 0) - printf("%s: vchi_msg_queue failed: %d\n", - __func__, ret); - buf = (char *)buf + bytes; - count -= bytes; - } + while (count > 0) { + int bytes = MIN((int)m.u.write.max_packet, (int)count); + ret = vchi_msg_queue(sc->vchi_handle, + buf, bytes, VCHI_FLAGS_BLOCK_UNTIL_QUEUED, NULL); + if (ret != 0) + printf("%s: vchi_msg_queue failed: %d\n", + __func__, ret); + buf = (char *)buf + bytes; + count -= bytes; } -done: - - vchi_service_release(sc->vchi_handle); - VCHIQ_VCHI_UNLOCK(sc); } static void @@ -477,70 +474,98 @@ bcm2835_audio_worker(void *data) struct bcm2835_audio_chinfo *ch = &sc->pch; uint32_t speed, format; uint32_t volume, dest; - bool parameters_changed, controls_changed; + uint32_t flags; + uint32_t count, size, readyptr; + uint8_t *buf; - sx_slock(&sc->worker_lock); - while(1) { + ch->playback_state = PLAYBACK_IDLE; - if (sc->unloading) + while (1) { + if (sc->worker_state != WORKER_RUNNING) break; - parameters_changed = false; - controls_changed = false; - bcm2835_audio_lock(sc); - if (sc->parameters_update_pending) { - /* TODO: update parameters */ + BCM2835_AUDIO_LOCK(sc); + /* + * wait until there are flags set or buffer is ready + * to consume more samples + */ + while ((sc->flags_pending == 0) && + bcm2835_audio_buffer_should_sleep(ch)) { + cv_wait_sig(&sc->worker_cv, &sc->lock); + } + flags = sc->flags_pending; + /* Clear pending flags */ + sc->flags_pending = 0; + BCM2835_AUDIO_UNLOCK(sc); + + /* Requested to change parameters */ + if (flags & AUDIO_PARAMS) { + BCM2835_AUDIO_LOCK(sc); speed = ch->spd; format = ch->fmt; - sc->parameters_update_pending = false; - parameters_changed = true; - } - - if (sc->controls_update_pending) { volume = sc->volume; dest = sc->dest; - sc->controls_update_pending = false; - controls_changed = true; + BCM2835_AUDIO_UNLOCK(sc); + if (ch->playback_state == PLAYBACK_IDLE) + bcm2835_audio_update_params(sc, format, speed); + bcm2835_audio_update_controls(sc, volume, dest); } - bcm2835_audio_unlock(sc); - - if (parameters_changed) { - bcm2835_audio_update_params(sc, format, speed); + /* Requested to stop playback */ + if ((flags & AUDIO_STOP) && + (ch->playback_state == PLAYBACK_PLAYING)) { + bcm2835_audio_stop(ch); + BCM2835_AUDIO_LOCK(sc); + bcm2835_audio_reset_channel(&sc->pch); + ch->playback_state = PLAYBACK_IDLE; + BCM2835_AUDIO_UNLOCK(sc); + continue; } - if (controls_changed) { - bcm2835_audio_update_controls(sc, volume, dest); + /* Requested to start playback */ + if ((flags & AUDIO_PLAY) && + (ch->playback_state == PLAYBACK_IDLE)) { + BCM2835_AUDIO_LOCK(sc); + ch->playback_state = PLAYBACK_PLAYING; + BCM2835_AUDIO_UNLOCK(sc); + bcm2835_audio_start(ch); } - if (ch->playback_state == PLAYBACK_IDLE) { - cv_wait_sig(&sc->worker_cv, &sc->worker_lock); + if (ch->playback_state == PLAYBACK_IDLE) continue; - } - if (ch->playback_state == PLAYBACK_STOPPING) { - bcm2835_audio_stop(ch); - bcm2835_audio_reset_channel(&sc->pch); - ch->playback_state = PLAYBACK_IDLE; + if (sndbuf_getready(ch->buffer) == 0) continue; - } - if (ch->free_buffer < vchiq_unbuffered_bytes(ch)) { - cv_timedwait_sig(&sc->worker_cv, &sc->worker_lock, 10); + count = sndbuf_getready(ch->buffer); + size = sndbuf_getsize(ch->buffer); + readyptr = sndbuf_getreadyptr(ch->buffer); + + BCM2835_AUDIO_LOCK(sc); + if (readyptr + count > size) + count = size - readyptr; + count = min(count, ch->available_space); + count -= (count % VCHIQ_AUDIO_PACKET_SIZE); + BCM2835_AUDIO_UNLOCK(sc); + + if (count < VCHIQ_AUDIO_PACKET_SIZE) continue; - } - bcm2835_audio_write_samples(ch); + buf = (uint8_t*)sndbuf_getbuf(ch->buffer) + readyptr; - if (ch->playback_state == PLAYBACK_STARTING) { - ch->prebuffered++; - if (ch->prebuffered == VCHIQ_AUDIO_PREBUFFER) { - bcm2835_audio_start(ch); - ch->playback_state = PLAYBACK_PLAYING; - } - } + bcm2835_audio_write_samples(ch, buf, count); + BCM2835_AUDIO_LOCK(sc); + ch->unsubmittedptr = (ch->unsubmittedptr + count) % sndbuf_getsize(ch->buffer); + ch->available_space -= count; + ch->submitted_samples += count; + KASSERT(ch->available_space >= 0, ("ch->available_space == %d\n", ch->available_space)); + BCM2835_AUDIO_UNLOCK(sc); } - sx_sunlock(&sc->worker_lock); + + BCM2835_AUDIO_LOCK(sc); + sc->worker_state = WORKER_STOPPED; + cv_signal(&sc->worker_cv); + BCM2835_AUDIO_UNLOCK(sc); kproc_exit(0); } @@ -550,6 +575,7 @@ bcm2835_audio_create_worker(struct bcm28 { struct proc *newp; + sc->worker_state = WORKER_RUNNING; if (kproc_create(bcm2835_audio_worker, (void*)sc, &newp, 0, 0, "bcm2835_audio_worker") != 0) { printf("failed to create bcm2835_audio_worker\n"); @@ -585,8 +611,9 @@ bcmchan_init(kobj_t obj, void *devinfo, return NULL; } - sc->parameters_update_pending = true; - cv_signal(&sc->worker_cv); + BCM2835_AUDIO_LOCK(sc); + bcm2835_worker_update_params(sc); + BCM2835_AUDIO_UNLOCK(sc); return ch; } @@ -610,12 +637,10 @@ bcmchan_setformat(kobj_t obj, void *data struct bcm2835_audio_chinfo *ch = data; struct bcm2835_audio_info *sc = ch->parent; - bcm2835_audio_lock(sc); + BCM2835_AUDIO_LOCK(sc); ch->fmt = format; - sc->parameters_update_pending = true; - bcm2835_audio_unlock(sc); - - cv_signal(&sc->worker_cv); + bcm2835_worker_update_params(sc); + BCM2835_AUDIO_UNLOCK(sc); return 0; } @@ -626,12 +651,10 @@ bcmchan_setspeed(kobj_t obj, void *data, struct bcm2835_audio_chinfo *ch = data; struct bcm2835_audio_info *sc = ch->parent; - bcm2835_audio_lock(sc); + BCM2835_AUDIO_LOCK(sc); ch->spd = speed; - sc->parameters_update_pending = true; - bcm2835_audio_unlock(sc); - - cv_signal(&sc->worker_cv); + bcm2835_worker_update_params(sc); + BCM2835_AUDIO_UNLOCK(sc); return ch->spd; } @@ -653,25 +676,18 @@ bcmchan_trigger(kobj_t obj, void *data, if (!PCMTRIG_COMMON(go)) return (0); - switch (go) { case PCMTRIG_START: - bcm2835_audio_lock(sc); - bcm2835_audio_reset_channel(ch); - ch->playback_state = PLAYBACK_STARTING; - bcm2835_audio_unlock(sc); /* kickstart data flow */ chn_intr(sc->pch.channel); - /* wakeup worker thread */ - cv_signal(&sc->worker_cv); + ch->submitted_samples = 0; + ch->retrieved_samples = 0; + bcm2835_worker_play_start(sc); break; case PCMTRIG_STOP: case PCMTRIG_ABORT: - bcm2835_audio_lock(sc); - ch->playback_state = PLAYBACK_STOPPING; - bcm2835_audio_unlock(sc); - cv_signal(&sc->worker_cv); + bcm2835_worker_play_stop(sc); break; default: @@ -687,11 +703,9 @@ bcmchan_getptr(kobj_t obj, void *data) struct bcm2835_audio_info *sc = ch->parent; uint32_t ret; - bcm2835_audio_lock(sc); - - ret = ch->complete_pos - (ch->complete_pos % VCHIQ_AUDIO_PACKET_SIZE); - - bcm2835_audio_unlock(sc); + BCM2835_AUDIO_LOCK(sc); + ret = ch->unsubmittedptr; + BCM2835_AUDIO_UNLOCK(sc); return ret; } @@ -734,11 +748,11 @@ bcmmix_set(struct snd_mixer *m, unsigned switch (dev) { case SOUND_MIXER_VOLUME: - bcm2835_audio_lock(sc); + BCM2835_AUDIO_LOCK(sc); sc->volume = left; - sc->controls_update_pending = true; - bcm2835_audio_unlock(sc); - cv_signal(&sc->worker_cv); + bcm2835_worker_update_params(sc); + BCM2835_AUDIO_UNLOCK(sc); + break; default: @@ -771,13 +785,13 @@ sysctl_bcm2835_audio_dest(SYSCTL_HANDLER if ((val < 0) || (val > 2)) return (EINVAL); - bcm2835_audio_lock(sc); + BCM2835_AUDIO_LOCK(sc); sc->dest = val; - sc->controls_update_pending = true; - bcm2835_audio_unlock(sc); + bcm2835_worker_update_params(sc); + BCM2835_AUDIO_UNLOCK(sc); - cv_signal(&sc->worker_cv); - device_printf(sc->dev, "destination set to %s\n", dest_description(val)); + if (bootverbose) + device_printf(sc->dev, "destination set to %s\n", dest_description(val)); return (0); } @@ -799,6 +813,24 @@ vchi_audio_sysctl_init(struct bcm2835_au CTLFLAG_RW | CTLTYPE_UINT, sc, sizeof(*sc), sysctl_bcm2835_audio_dest, "IU", "audio destination, " "0 - auto, 1 - headphones, 2 - HDMI"); + SYSCTL_ADD_UQUAD(ctx, tree, OID_AUTO, "callbacks", + CTLFLAG_RD, &sc->pch.callbacks, + "callbacks total"); + SYSCTL_ADD_UQUAD(ctx, tree, OID_AUTO, "submitted", + CTLFLAG_RD, &sc->pch.submitted_samples, + "last play submitted samples"); + SYSCTL_ADD_UQUAD(ctx, tree, OID_AUTO, "retrieved", + CTLFLAG_RD, &sc->pch.retrieved_samples, + "last play retrieved samples"); + SYSCTL_ADD_UQUAD(ctx, tree, OID_AUTO, "underruns", + CTLFLAG_RD, &sc->pch.underruns, + "callback underruns"); + SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "freebuffer", + CTLFLAG_RD, &sc->pch.available_space, + sc->pch.available_space, "callbacks total"); + SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "starved", + CTLFLAG_RD, &sc->pch.starved, + sc->pch.starved, "number of starved conditions"); } static void @@ -816,7 +848,6 @@ bcm2835_audio_probe(device_t dev) return (BUS_PROBE_DEFAULT); } - static void bcm2835_audio_delayed_init(void *xsc) { @@ -837,7 +868,7 @@ bcm2835_audio_delayed_init(void *xsc) goto no; } - if (pcm_register(sc->dev, sc, 1, 1)) { + if (pcm_register(sc->dev, sc, 1, 0)) { device_printf(sc->dev, "pcm_register failed\n"); goto no; } @@ -865,14 +896,12 @@ bcm2835_audio_attach(device_t dev) sc->dev = dev; sc->bufsz = VCHIQ_AUDIO_BUFFER_SIZE; - sc->lock = snd_mtxcreate(device_get_nameunit(dev), "bcm2835_audio softc"); - - sx_init(&sc->vchi_lock, device_get_nameunit(dev)); - sx_init(&sc->worker_lock, "bcm_audio_worker_lock"); + mtx_init(&sc->lock, device_get_nameunit(dev), + "bcm_audio_lock", MTX_DEF); cv_init(&sc->worker_cv, "worker_cv"); sc->vchi_handle = VCHIQ_SERVICE_HANDLE_INVALID; - /* + /* * We need interrupts enabled for VCHI to work properly, * so delay initialization until it happens. */ @@ -896,26 +925,23 @@ bcm2835_audio_detach(device_t dev) sc = pcm_getdevinfo(dev); /* Stop worker thread */ - sx_xlock(&sc->worker_lock); - sc->unloading = 1; - sx_xunlock(&sc->worker_lock); + BCM2835_AUDIO_LOCK(sc); + sc->worker_state = WORKER_STOPPING; cv_signal(&sc->worker_cv); + /* Wait for thread to exit */ + while (sc->worker_state != WORKER_STOPPED) + cv_wait_sig(&sc->worker_cv, &sc->lock); + BCM2835_AUDIO_UNLOCK(sc); r = pcm_unregister(dev); if (r) return r; - sx_destroy(&sc->vchi_lock); - sx_destroy(&sc->worker_lock); + mtx_destroy(&sc->lock); cv_destroy(&sc->worker_cv); bcm2835_audio_release(sc); - if (sc->lock) { - snd_mtxfree(sc->lock); - sc->lock = NULL; - } - free(sc, M_DEVBUF); return 0;
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