ALSA: firewire-lib: extend tracepoints event including CYCLE_TIME of 1394 OHCI

A commit baa914cd81f5 ("firewire: add kernel API to access CYCLE_TIME
register") allow unit drivers to read CYCLE_TIME of 1394 OHCI controller.
The value expresses monotonic time with 42.195 Mhz resolution and wrapping
around every 128 seconds. The controller uses the time to govern
isochronous cycle.

This commit extends tracepoints event including the value so that event
parser can compute gap between current isochronous cycle and the latest
isochronous cycle in which packet is processed (in IR context) or scheduled
(in IT context). It loses backward compatibility to former format of the
tracepoints event.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230109213231.138223-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 15 insertions, 6 deletions

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 430b33dc60b3..65720ae866cb 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -674,7 +674,7 @@ static void build_it_pkt_header(struct amdtp_stream *s, unsigned int cycle,
 				struct fw_iso_packet *params, unsigned int header_length,
 				unsigned int data_blocks,
 				unsigned int data_block_counter,
-				unsigned int syt, unsigned int index)
+				unsigned int syt, unsigned int index, u32 curr_cycle_time)
 {
 	unsigned int payload_length;
 	__be32 *cip_header;
@@ -691,7 +691,7 @@ static void build_it_pkt_header(struct amdtp_stream *s, unsigned int cycle,
 	}
 
 	trace_amdtp_packet(s, cycle, cip_header, payload_length + header_length, data_blocks,
-			   data_block_counter, s->packet_index, index);
+			   data_block_counter, s->packet_index, index, curr_cycle_time);
 }
 
 static int check_cip_header(struct amdtp_stream *s, const __be32 *buf,
@@ -793,7 +793,8 @@ static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle,
 			       const __be32 *ctx_header,
 			       unsigned int *data_blocks,
 			       unsigned int *data_block_counter,
-			       unsigned int *syt, unsigned int packet_index, unsigned int index)
+			       unsigned int *syt, unsigned int packet_index, unsigned int index,
+			       u32 curr_cycle_time)
 {
 	unsigned int payload_length;
 	const __be32 *cip_header;
@@ -838,7 +839,7 @@ static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle,
 	}
 
 	trace_amdtp_packet(s, cycle, cip_header, payload_length, *data_blocks,
-			   *data_block_counter, packet_index, index);
+			   *data_block_counter, packet_index, index, curr_cycle_time);
 
 	return 0;
 }
@@ -889,9 +890,13 @@ static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *des
 	unsigned int dbc = s->data_block_counter;
 	unsigned int packet_index = s->packet_index;
 	unsigned int queue_size = s->queue_size;
+	u32 curr_cycle_time;
 	int i;
 	int err;
 
+	if (trace_amdtp_packet_enabled())
+		(void)fw_card_read_cycle_time(fw_parent_device(s->unit)->card, &curr_cycle_time);
+
 	*desc_count = 0;
 	for (i = 0; i < packet_count; ++i) {
 		unsigned int cycle;
@@ -936,7 +941,7 @@ static int generate_tx_packet_descs(struct amdtp_stream *s, struct pkt_desc *des
 		}
 
 		err = parse_ir_ctx_header(s, cycle, ctx_header, &data_blocks, &dbc, &syt,
-					  packet_index, i);
+					  packet_index, i, curr_cycle_time);
 		if (err < 0)
 			return err;
 
@@ -1050,6 +1055,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_
 	struct pkt_desc *desc = s->packet_descs_cursor;
 	unsigned int pkt_header_length;
 	unsigned int packets;
+	u32 curr_cycle_time;
 	bool need_hw_irq;
 	int i;
 
@@ -1078,6 +1084,9 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_
 		need_hw_irq = false;
 	}
 
+	if (trace_amdtp_packet_enabled())
+		(void)fw_card_read_cycle_time(fw_parent_device(s->unit)->card, &curr_cycle_time);
+
 	for (i = 0; i < packets; ++i) {
 		struct {
 			struct fw_iso_packet params;
@@ -1087,7 +1096,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_
 
 		build_it_pkt_header(s, desc->cycle, &template.params, pkt_header_length,
 				    desc->data_blocks, desc->data_block_counter,
-				    desc->syt, i);
+				    desc->syt, i, curr_cycle_time);
 
 		if (s == s->domain->irq_target) {
 			event_count += desc->data_blocks;