[PATCH 0/3] ALSA: firewire-lib: keep history to process isochronous packet

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Takashi Sakamoto

9 Jan 2023 9 Jan '23

3:17 a.m.

Hi,

This patchset is preparation for computation of extra delay in runtime of PCM substream.

Current implementation uses list of packet descriptor to process isochronous packets. The packet descriptors are overwritten every time to process packets, while the history of packet descriptors is useful when computing gap between current isochronous cycle and the latest isochronous cycle in which isochronous packet is processed or scheduled.

Conveniently, circular linked list was added to Linux kernel v5.19 at a commit 2fbdf45d7d26 ("list: Add list_next_entry_circular() and list_prev_entry_circular()"). This patchset changes data structure from list to the circular linked list for the packet descriptors.

Takashi Sakamoto (3): ALSA: firewire-lib: use circular linked list to enumerate packet descriptors ALSA: firewire-lib: use circular linked list for context payload processing layer ALSA: firewire-lib: store history to process isochronous packet

sound/firewire/amdtp-am824.c | 18 +++--- sound/firewire/amdtp-stream.c | 61 ++++++++++++------- sound/firewire/amdtp-stream.h | 17 +++++- sound/firewire/digi00x/amdtp-dot.c | 18 +++--- sound/firewire/fireface/amdtp-ff.c | 18 +++--- sound/firewire/motu/amdtp-motu.c | 48 ++++++++------- .../motu/motu-command-dsp-message-parser.c | 11 ++-- .../motu/motu-register-dsp-message-parser.c | 11 ++-- sound/firewire/motu/motu.h | 8 +-- sound/firewire/tascam/amdtp-tascam.c | 18 +++--- 10 files changed, 139 insertions(+), 89 deletions(-)

-- 2.37.2

Show replies by date

Takashi Sakamoto

9 Jan 9 Jan

3:17 a.m.

New subject: [PATCH 1/3] ALSA: firewire-lib: use circular linked list to enumerate packet descriptors

Current implementation uses list of packet descriptor as template to schedule isochronous packet. The packet descriptors are operated by position and size, while circular linked list is convenient to enumerate the packet descriptors.

This commit utilizes circular linked list for the purpose.

Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/amdtp-stream.c | 47 ++++++++++++++++++++++------------- sound/firewire/amdtp-stream.h | 12 +++++++++ 2 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 5ecb449ff6fa..794ac693aae6 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -504,7 +504,7 @@ static unsigned int calculate_cached_cycle_count(struct amdtp_stream *s, unsigne return cycles; }

-static void cache_seq(struct amdtp_stream *s, const struct pkt_desc *descs, unsigned int desc_count) +static void cache_seq(struct amdtp_stream *s, const struct pkt_desc *src, unsigned int desc_count) { const unsigned int transfer_delay = s->transfer_delay; const unsigned int cache_size = s->ctx_data.tx.cache.size; @@ -515,7 +515,6 @@ static void cache_seq(struct amdtp_stream *s, const struct pkt_desc *descs, unsi

for (i = 0; i < desc_count; ++i) { struct seq_desc *dst = cache + cache_pos; - const struct pkt_desc *src = descs + i;

if (aware_syt && src->syt != CIP_SYT_NO_INFO) dst->syt_offset = compute_syt_offset(src->syt, src->cycle, transfer_delay); @@ -524,6 +523,7 @@ static void cache_seq(struct amdtp_stream *s, const struct pkt_desc *descs, unsi dst->data_blocks = src->data_blocks;

cache_pos = (cache_pos + 1) % cache_size; + src = amdtp_stream_next_packet_desc(s, src); }

s->ctx_data.tx.cache.pos = cache_pos; @@ -881,7 +881,7 @@ static inline u32 compute_ohci_it_cycle(const __be32 ctx_header_tstamp, return increment_ohci_cycle_count(cycle, queue_size); }

-static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *descs, +static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *desc, const __be32 *ctx_header, unsigned int packet_count, unsigned int *desc_count) { @@ -894,7 +894,6 @@ static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *des

*desc_count = 0; for (i = 0; i < packet_count; ++i) { - struct pkt_desc *desc = descs + *desc_count; unsigned int cycle; bool lost; unsigned int data_blocks; @@ -918,7 +917,7 @@ static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *des desc->data_blocks = 0; desc->data_block_counter = dbc; desc->ctx_payload = NULL; - ++desc; + desc = amdtp_stream_next_packet_desc(s, desc); ++(*desc_count); } } else if (s->flags & CIP_JUMBO_PAYLOAD) { @@ -951,6 +950,7 @@ static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *des dbc = (dbc + desc->data_blocks) & 0xff;

next_cycle = increment_ohci_cycle_count(next_cycle, 1); + desc = amdtp_stream_next_packet_desc(s, desc); ++(*desc_count); ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header); packet_index = (packet_index + 1) % queue_size; @@ -973,7 +973,7 @@ static unsigned int compute_syt(unsigned int syt_offset, unsigned int cycle, return syt & CIP_SYT_MASK; }

-static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *descs, +static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *desc, const __be32 *ctx_header, unsigned int packet_count) { struct seq_desc *seq_descs = s->ctx_data.rx.seq.descs; @@ -986,7 +986,6 @@ static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *de pool_seq_descs(s, seq_descs, seq_size, seq_pos, packet_count);

for (i = 0; i < packet_count; ++i) { - struct pkt_desc *desc = descs + i; unsigned int index = (s->packet_index + i) % s->queue_size; const struct seq_desc *seq = seq_descs + seq_pos;

@@ -1010,6 +1009,7 @@ static void generate_rx_packet_descs(struct amdtp_stream *s, struct pkt_desc *de desc->ctx_payload = s->buffer.packets[index].buffer;

seq_pos = (seq_pos + 1) % seq_size; + desc = amdtp_stream_next_packet_desc(s, desc);

++ctx_header; } @@ -1047,6 +1047,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ const __be32 *ctx_header = header; const unsigned int events_per_period = d->events_per_period; unsigned int event_count = s->ctx_data.rx.event_count; + struct pkt_desc *desc = s->pkt_descs; unsigned int pkt_header_length; unsigned int packets; bool need_hw_irq; @@ -1058,9 +1059,9 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ // Calculate the number of packets in buffer and check XRUN. packets = header_length / sizeof(*ctx_header);

- generate_rx_packet_descs(s, s->pkt_descs, ctx_header, packets); + generate_rx_packet_descs(s, desc, ctx_header, packets);

- process_ctx_payloads(s, s->pkt_descs, packets); + process_ctx_payloads(s, desc, packets);

if (!(s->flags & CIP_NO_HEADER)) pkt_header_length = IT_PKT_HEADER_SIZE_CIP; @@ -1078,7 +1079,6 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ }

for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = s->pkt_descs + i; struct { struct fw_iso_packet params; __be32 header[CIP_HEADER_QUADLETS]; @@ -1101,6 +1101,8 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ cancel_stream(s); return; } + + desc = amdtp_stream_next_packet_desc(s, desc); }

s->ctx_data.rx.event_count = event_count; @@ -1200,6 +1202,7 @@ static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_ { struct amdtp_stream *s = private_data; __be32 *ctx_header = header; + struct pkt_desc *desc = s->pkt_descs; unsigned int packet_count; unsigned int desc_count; int i; @@ -1212,7 +1215,7 @@ static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_ packet_count = header_length / s->ctx_data.tx.ctx_header_size;

desc_count = 0; - err = generate_tx_packet_descs(s, s->pkt_descs, ctx_header, packet_count, &desc_count); + err = generate_tx_packet_descs(s, desc, ctx_header, packet_count, &desc_count); if (err < 0) { if (err != -EAGAIN) { cancel_stream(s); @@ -1221,10 +1224,10 @@ static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_ } else { struct amdtp_domain *d = s->domain;

- process_ctx_payloads(s, s->pkt_descs, desc_count); + process_ctx_payloads(s, desc, desc_count);

if (d->replay.enable) - cache_seq(s, s->pkt_descs, desc_count); + cache_seq(s, desc, desc_count); }

for (i = 0; i < packet_count; ++i) { @@ -1547,7 +1550,8 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, unsigned int ctx_header_size; unsigned int max_ctx_payload_size; enum dma_data_direction dir; - int type, tag, err; + struct pkt_desc *descs; + int i, type, tag, err;

mutex_lock(&s->mutex);

@@ -1655,12 +1659,19 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, else s->tag = TAG_CIP;

- s->pkt_descs = kcalloc(s->queue_size, sizeof(*s->pkt_descs), - GFP_KERNEL); - if (!s->pkt_descs) { + descs = kcalloc(s->queue_size, sizeof(*descs), GFP_KERNEL); + if (!descs) { err = -ENOMEM; goto err_context; } + s->pkt_descs = descs; + + INIT_LIST_HEAD(&s->packet_descs_list); + for (i = 0; i < s->queue_size; ++i) { + INIT_LIST_HEAD(&descs->link); + list_add_tail(&descs->link, &s->packet_descs_list); + ++descs; + }

s->packet_index = 0; do { @@ -1700,6 +1711,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, return 0; err_pkt_descs: kfree(s->pkt_descs); + s->pkt_descs = NULL; err_context: if (s->direction == AMDTP_OUT_STREAM) { kfree(s->ctx_data.rx.seq.descs); @@ -1794,6 +1806,7 @@ static void amdtp_stream_stop(struct amdtp_stream *s) s->context = ERR_PTR(-1); iso_packets_buffer_destroy(&s->buffer, s->unit); kfree(s->pkt_descs); + s->pkt_descs = NULL;

if (s->direction == AMDTP_OUT_STREAM) { kfree(s->ctx_data.rx.seq.descs); diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h index f021c1f49137..4bf701796166 100644 --- a/sound/firewire/amdtp-stream.h +++ b/sound/firewire/amdtp-stream.h @@ -103,6 +103,7 @@ struct pkt_desc { unsigned int data_blocks; unsigned int data_block_counter; __be32 *ctx_payload; + struct list_head link; };

struct amdtp_stream; @@ -126,6 +127,7 @@ struct amdtp_stream { unsigned int queue_size; int packet_index; struct pkt_desc *pkt_descs; + struct list_head packet_descs_list; int tag; union { struct { @@ -276,6 +278,16 @@ static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s, WRITE_ONCE(s->pcm, pcm); }

+/** + * amdtp_stream_next_packet_desc - retrieve next descriptor for amdtp packet. + * @s: the AMDTP stream + * @desc: the descriptor of packet + * + * This macro computes next descriptor so that the list of descriptors behaves circular queue. + */ +#define amdtp_stream_next_packet_desc(s, desc) \ + list_next_entry_circular(desc, &s->packet_descs_list, link) + static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) { return sfc & 1;

-- 2.37.2

Takashi Sakamoto

3:17 a.m.

New subject: [PATCH 2/3] ALSA: firewire-lib: use circular linked list for context payload processing layer

The list of packet descriptor is passed to context payload processing layer so that each driver can copy PCM frames, MIDI messages, and device specific data between packet payload buffer and intermediate buffer for user space application.

The list of packet descriptor was replaced by circular linked list in a previous commit. This commit uses circular linked in context payload processing layer as well.

Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/amdtp-am824.c | 18 +++---- sound/firewire/amdtp-stream.c | 4 +- sound/firewire/amdtp-stream.h | 2 +- sound/firewire/digi00x/amdtp-dot.c | 18 +++---- sound/firewire/fireface/amdtp-ff.c | 18 +++---- sound/firewire/motu/amdtp-motu.c | 48 ++++++++++--------- .../motu/motu-command-dsp-message-parser.c | 11 +++-- .../motu/motu-register-dsp-message-parser.c | 11 +++-- sound/firewire/motu/motu.h | 8 ++-- sound/firewire/tascam/amdtp-tascam.c | 18 +++---- 10 files changed, 87 insertions(+), 69 deletions(-)

diff --git a/sound/firewire/amdtp-am824.c b/sound/firewire/amdtp-am824.c index d9c700f652bb..cf55f7784d23 100644 --- a/sound/firewire/amdtp-am824.c +++ b/sound/firewire/amdtp-am824.c @@ -347,16 +347,15 @@ static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer, }

static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, - const struct pkt_desc *descs, - unsigned int packets, + const struct pkt_desc *desc, + unsigned int count, struct snd_pcm_substream *pcm) { struct amdtp_am824 *p = s->protocol; unsigned int pcm_frames = 0; int i;

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -371,22 +370,23 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, write_midi_messages(s, buf, data_blocks, desc->data_block_counter); } + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; }

static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, - const struct pkt_desc *descs, - unsigned int packets, + const struct pkt_desc *desc, + unsigned int count, struct snd_pcm_substream *pcm) { struct amdtp_am824 *p = s->protocol; unsigned int pcm_frames = 0; int i;

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -399,6 +399,8 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, read_midi_messages(s, buf, data_blocks, desc->data_block_counter); } + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 794ac693aae6..006dc939065f 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -1028,13 +1028,13 @@ static inline void cancel_stream(struct amdtp_stream *s)

static void process_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *descs, - unsigned int packets) + unsigned int count) { struct snd_pcm_substream *pcm; unsigned int pcm_frames;

pcm = READ_ONCE(s->pcm); - pcm_frames = s->process_ctx_payloads(s, descs, packets, pcm); + pcm_frames = s->process_ctx_payloads(s, descs, count, pcm); if (pcm) update_pcm_pointers(s, pcm, pcm_frames); } diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h index 4bf701796166..84156d0d57b8 100644 --- a/sound/firewire/amdtp-stream.h +++ b/sound/firewire/amdtp-stream.h @@ -110,7 +110,7 @@ struct amdtp_stream; typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)( struct amdtp_stream *s, const struct pkt_desc *desc, - unsigned int packets, + unsigned int count, struct snd_pcm_substream *pcm);

struct amdtp_domain; diff --git a/sound/firewire/digi00x/amdtp-dot.c b/sound/firewire/digi00x/amdtp-dot.c index 59b86c8d89e1..fcae7d07aa03 100644 --- a/sound/firewire/digi00x/amdtp-dot.c +++ b/sound/firewire/digi00x/amdtp-dot.c @@ -342,15 +342,14 @@ void amdtp_dot_midi_trigger(struct amdtp_stream *s, unsigned int port, }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -360,21 +359,22 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, }

read_midi_messages(s, buf, data_blocks); + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -387,6 +387,8 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,

write_midi_messages(s, buf, data_blocks, desc->data_block_counter); + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; diff --git a/sound/firewire/fireface/amdtp-ff.c b/sound/firewire/fireface/amdtp-ff.c index 98177b0666d3..2402e2be87a6 100644 --- a/sound/firewire/fireface/amdtp-ff.c +++ b/sound/firewire/fireface/amdtp-ff.c @@ -113,15 +113,14 @@ int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s, }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __le32 *buf = (__le32 *)desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -131,21 +130,22 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, } else { write_pcm_silence(s, buf, data_blocks); } + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __le32 *buf = (__le32 *)desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -153,6 +153,8 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames); pcm_frames += data_blocks; } + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; diff --git a/sound/firewire/motu/amdtp-motu.c b/sound/firewire/motu/amdtp-motu.c index 2fb52f481d12..ea0063cec5fb 100644 --- a/sound/firewire/motu/amdtp-motu.c +++ b/sound/firewire/motu/amdtp-motu.c @@ -284,19 +284,19 @@ static void __maybe_unused copy_message(u64 *frames, __be32 *buffer, } }

-static void probe_tracepoints_events(struct amdtp_stream *s, - const struct pkt_desc *descs, - unsigned int packets) +static void probe_tracepoints_events(struct amdtp_stream *s, const struct pkt_desc *desc, + unsigned int count) { int i;

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

trace_data_block_sph(s, data_blocks, buf); trace_data_block_message(s, data_blocks, buf); + + desc = amdtp_stream_next_packet_desc(s, desc); } }

@@ -329,12 +329,13 @@ static void cache_event_offsets(struct amdtp_motu_cache *cache, const __be32 *bu }

static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, - const struct pkt_desc *descs, - unsigned int packets, + const struct pkt_desc *desc, + unsigned int count, struct snd_pcm_substream *pcm) { struct snd_motu *motu = container_of(s, struct snd_motu, tx_stream); struct amdtp_motu *p = s->protocol; + const struct pkt_desc *cursor = desc; unsigned int pcm_frames = 0; int i;

@@ -342,8 +343,7 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, p->cache->tx_cycle_count = (s->domain->processing_cycle.tx_start % CYCLES_PER_SECOND);

// For data block processing. - for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -356,20 +356,20 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,

if (p->midi_ports) read_midi_messages(s, buf, data_blocks); - }

- if (motu->spec->flags & SND_MOTU_SPEC_REGISTER_DSP) { - snd_motu_register_dsp_message_parser_parse(motu, descs, packets, - s->data_block_quadlets); - } else if (motu->spec->flags & SND_MOTU_SPEC_COMMAND_DSP) { - snd_motu_command_dsp_message_parser_parse(motu, descs, packets, - s->data_block_quadlets); + desc = amdtp_stream_next_packet_desc(s, desc); }

+ desc = cursor; + if (motu->spec->flags & SND_MOTU_SPEC_REGISTER_DSP) + snd_motu_register_dsp_message_parser_parse(s, desc, count); + else if (motu->spec->flags & SND_MOTU_SPEC_COMMAND_DSP) + snd_motu_command_dsp_message_parser_parse(s, desc, count); + // For tracepoints. if (trace_data_block_sph_enabled() || trace_data_block_message_enabled()) - probe_tracepoints_events(s, descs, packets); + probe_tracepoints_events(s, desc, count);

return pcm_frames; } @@ -397,11 +397,12 @@ static void write_sph(struct amdtp_motu_cache *cache, __be32 *buffer, unsigned i }

static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, - const struct pkt_desc *descs, - unsigned int packets, + const struct pkt_desc *desc, + unsigned int count, struct snd_pcm_substream *pcm) { struct amdtp_motu *p = s->protocol; + const struct pkt_desc *cursor = desc; unsigned int pcm_frames = 0; int i;

@@ -409,8 +410,7 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, p->cache->rx_cycle_count = (s->domain->processing_cycle.rx_start % CYCLES_PER_SECOND);

@@ -425,12 +425,16 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, write_midi_messages(s, buf, data_blocks);

write_sph(p->cache, buf, data_blocks, s->data_block_quadlets); + + desc = amdtp_stream_next_packet_desc(s, desc); }

+ desc = cursor; + // For tracepoints. if (trace_data_block_sph_enabled() || trace_data_block_message_enabled()) - probe_tracepoints_events(s, descs, packets); + probe_tracepoints_events(s, desc, count);

return pcm_frames; } diff --git a/sound/firewire/motu/motu-command-dsp-message-parser.c b/sound/firewire/motu/motu-command-dsp-message-parser.c index 9efe4d364baf..5d8a86a12f1f 100644 --- a/sound/firewire/motu/motu-command-dsp-message-parser.c +++ b/sound/firewire/motu/motu-command-dsp-message-parser.c @@ -80,9 +80,11 @@ int snd_motu_command_dsp_message_parser_init(struct snd_motu *motu, enum cip_sfc #define FRAGMENTS_PER_VALUE 4 #define VALUES_AT_IMAGE_END 0xffffffffffffffff

-void snd_motu_command_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, - unsigned int desc_count, unsigned int data_block_quadlets) +void snd_motu_command_dsp_message_parser_parse(const struct amdtp_stream *s, + const struct pkt_desc *desc, unsigned int count) { + struct snd_motu *motu = container_of(s, struct snd_motu, tx_stream); + unsigned int data_block_quadlets = s->data_block_quadlets; struct msg_parser *parser = motu->message_parser; unsigned int interval = parser->interval; unsigned long flags; @@ -90,12 +92,13 @@ void snd_motu_command_dsp_message_parser_parse(struct snd_motu *motu, const stru

spin_lock_irqsave(&parser->lock, flags);

- for (i = 0; i < desc_count; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buffer = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks; int j;

+ desc = amdtp_stream_next_packet_desc(s, desc); + for (j = 0; j < data_blocks; ++j) { u8 *b = (u8 *)buffer; buffer += data_block_quadlets; diff --git a/sound/firewire/motu/motu-register-dsp-message-parser.c b/sound/firewire/motu/motu-register-dsp-message-parser.c index 0c587567540f..ef3b0b0f0dab 100644 --- a/sound/firewire/motu/motu-register-dsp-message-parser.c +++ b/sound/firewire/motu/motu-register-dsp-message-parser.c @@ -142,9 +142,11 @@ static void queue_event(struct snd_motu *motu, u8 msg_type, u8 identifier0, u8 i parser->push_pos = pos; }

-void snd_motu_register_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, - unsigned int desc_count, unsigned int data_block_quadlets) +void snd_motu_register_dsp_message_parser_parse(const struct amdtp_stream *s, + const struct pkt_desc *desc, unsigned int count) { + struct snd_motu *motu = container_of(s, struct snd_motu, tx_stream); + unsigned int data_block_quadlets = s->data_block_quadlets; struct msg_parser *parser = motu->message_parser; bool meter_pos_quirk = parser->meter_pos_quirk; unsigned int pos = parser->push_pos; @@ -153,12 +155,13 @@ void snd_motu_register_dsp_message_parser_parse(struct snd_motu *motu, const str

spin_lock_irqsave(&parser->lock, flags);

+ desc = amdtp_stream_next_packet_desc(s, desc); + for (j = 0; j < data_blocks; ++j) { u8 *b = (u8 *)buffer; u8 msg_type = (b[MSG_FLAG_POS] & MSG_FLAG_TYPE_MASK) >> MSG_FLAG_TYPE_SHIFT; diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h index 4189f2192284..3b1dc98a7be0 100644 --- a/sound/firewire/motu/motu.h +++ b/sound/firewire/motu/motu.h @@ -279,8 +279,8 @@ static inline int snd_motu_protocol_cache_packet_formats(struct snd_motu *motu)

int snd_motu_register_dsp_message_parser_new(struct snd_motu *motu); int snd_motu_register_dsp_message_parser_init(struct snd_motu *motu); -void snd_motu_register_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, - unsigned int desc_count, unsigned int data_block_quadlets); +void snd_motu_register_dsp_message_parser_parse(const struct amdtp_stream *s, + const struct pkt_desc *descs, unsigned int count); void snd_motu_register_dsp_message_parser_copy_meter(struct snd_motu *motu, struct snd_firewire_motu_register_dsp_meter *meter); void snd_motu_register_dsp_message_parser_copy_parameter(struct snd_motu *motu, @@ -290,8 +290,8 @@ bool snd_motu_register_dsp_message_parser_copy_event(struct snd_motu *motu, u32

int snd_motu_command_dsp_message_parser_new(struct snd_motu *motu); int snd_motu_command_dsp_message_parser_init(struct snd_motu *motu, enum cip_sfc sfc); -void snd_motu_command_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, - unsigned int desc_count, unsigned int data_block_quadlets); +void snd_motu_command_dsp_message_parser_parse(const struct amdtp_stream *s, + const struct pkt_desc *descs, unsigned int count); void snd_motu_command_dsp_message_parser_copy_meter(struct snd_motu *motu, struct snd_firewire_motu_command_dsp_meter *meter);

diff --git a/sound/firewire/tascam/amdtp-tascam.c b/sound/firewire/tascam/amdtp-tascam.c index 64d66a802545..c367a6ee6121 100644 --- a/sound/firewire/tascam/amdtp-tascam.c +++ b/sound/firewire/tascam/amdtp-tascam.c @@ -177,15 +177,14 @@ static void read_status_messages(struct amdtp_stream *s, }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -195,21 +194,22 @@ static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s, }

read_status_messages(s, buf, data_blocks); + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames; }

- for (i = 0; i < packets; ++i) { - const struct pkt_desc *desc = descs + i; + for (i = 0; i < count; ++i) { __be32 *buf = desc->ctx_payload; unsigned int data_blocks = desc->data_blocks;

@@ -219,6 +219,8 @@ static unsigned int process_it_ctx_payloads(struct amdtp_stream *s, } else { write_pcm_silence(s, buf, data_blocks); } + + desc = amdtp_stream_next_packet_desc(s, desc); }

return pcm_frames;

-- 2.37.2

Takashi Sakamoto

3:17 a.m.

New subject: [PATCH 3/3] ALSA: firewire-lib: keep history to process isochronous packet

The history to process isochronous packets is useful when computing gap between current isochronous cycle and the latest isochronous cycle in which packet is processed (in IR context) and scheduled (in IT context).

This commit stores the most recent packet descriptors to keep the history.

Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/amdtp-stream.c | 20 +++++++++++++------- sound/firewire/amdtp-stream.h | 3 ++- 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 006dc939065f..430b33dc60b3 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -1047,7 +1047,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ const __be32 *ctx_header = header; const unsigned int events_per_period = d->events_per_period; unsigned int event_count = s->ctx_data.rx.event_count; - struct pkt_desc *desc = s->pkt_descs; + struct pkt_desc *desc = s->packet_descs_cursor; unsigned int pkt_header_length; unsigned int packets; bool need_hw_irq; @@ -1106,6 +1106,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_ }

s->ctx_data.rx.event_count = event_count; + s->packet_descs_cursor = desc; }

static void skip_rx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, @@ -1202,7 +1203,7 @@ static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_ { struct amdtp_stream *s = private_data; __be32 *ctx_header = header; - struct pkt_desc *desc = s->pkt_descs; + struct pkt_desc *desc = s->packet_descs_cursor; unsigned int packet_count; unsigned int desc_count; int i; @@ -1228,6 +1229,10 @@ static void process_tx_packets(struct fw_iso_context *context, u32 tstamp, size_

if (d->replay.enable) cache_seq(s, desc, desc_count); + + for (i = 0; i < desc_count; ++i) + desc = amdtp_stream_next_packet_desc(s, desc); + s->packet_descs_cursor = desc; }

for (i = 0; i < packet_count; ++i) { @@ -1664,7 +1669,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, err = -ENOMEM; goto err_context; } - s->pkt_descs = descs; + s->packet_descs = descs;

INIT_LIST_HEAD(&s->packet_descs_list); for (i = 0; i < s->queue_size; ++i) { @@ -1672,6 +1677,7 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed, list_add_tail(&descs->link, &s->packet_descs_list); ++descs; } + s->packet_descs_cursor = list_first_entry(&s->packet_descs_list, struct pkt_desc, link);

s->packet_index = 0; do { @@ -1710,8 +1716,8 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,

return 0; err_pkt_descs: - kfree(s->pkt_descs); - s->pkt_descs = NULL; + kfree(s->packet_descs); + s->packet_descs = NULL; err_context: if (s->direction == AMDTP_OUT_STREAM) { kfree(s->ctx_data.rx.seq.descs); @@ -1805,8 +1811,8 @@ static void amdtp_stream_stop(struct amdtp_stream *s) fw_iso_context_destroy(s->context); s->context = ERR_PTR(-1); iso_packets_buffer_destroy(&s->buffer, s->unit); - kfree(s->pkt_descs); - s->pkt_descs = NULL; + kfree(s->packet_descs); + s->packet_descs = NULL;

if (s->direction == AMDTP_OUT_STREAM) { kfree(s->ctx_data.rx.seq.descs); diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h index 84156d0d57b8..a8dd1c3ec8d9 100644 --- a/sound/firewire/amdtp-stream.h +++ b/sound/firewire/amdtp-stream.h @@ -126,8 +126,9 @@ struct amdtp_stream { struct iso_packets_buffer buffer; unsigned int queue_size; int packet_index; - struct pkt_desc *pkt_descs; + struct pkt_desc *packet_descs; struct list_head packet_descs_list; + struct pkt_desc *packet_descs_cursor; int tag; union { struct {

-- 2.37.2

Takashi Iwai

5:05 p.m.

On Mon, 09 Jan 2023 03:17:35 +0100, Takashi Sakamoto wrote:

...

Hi,

This patchset is preparation for computation of extra delay in runtime of PCM substream.

Current implementation uses list of packet descriptor to process isochronous packets. The packet descriptors are overwritten every time to process packets, while the history of packet descriptors is useful when computing gap between current isochronous cycle and the latest isochronous cycle in which isochronous packet is processed or scheduled.

Conveniently, circular linked list was added to Linux kernel v5.19 at a commit 2fbdf45d7d26 ("list: Add list_next_entry_circular() and list_prev_entry_circular()"). This patchset changes data structure from list to the circular linked list for the packet descriptors.

Takashi Sakamoto (3): ALSA: firewire-lib: use circular linked list to enumerate packet descriptors ALSA: firewire-lib: use circular linked list for context payload processing layer ALSA: firewire-lib: store history to process isochronous packet

Applied now to for-next branch. Thanks.

Takashi

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Takashi Iwai
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