diff mbox series

spi: axi-spi-engine: Emit trace events for spi transfers

Message ID 20241031111646.747692-2-u.kleine-koenig@baylibre.com
State New
Headers show
Series spi: axi-spi-engine: Emit trace events for spi transfers | expand

Commit Message

Uwe Kleine-König Oct. 31, 2024, 11:16 a.m. UTC 
As this spi host controller driver implements the
.transfer_one_message() callback, it has to care about these traces
it-self. With the transfers being compiled it's difficult to determine
where handling of one transfer ends and the next begins, so just
generate the start events in batch before the hardware fifo is fed and
the end events when their completion triggered.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
---
 drivers/spi/spi-axi-spi-engine.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)


base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
diff mbox series

Patch

diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 2dff95d2b3f5..7c252126b33e 100644
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -15,6 +15,7 @@ 
 #include <linux/overflow.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
+#include <trace/events/spi.h>
 
 #define SPI_ENGINE_REG_RESET			0x40
 
@@ -590,6 +591,13 @@  static int spi_engine_transfer_one_message(struct spi_controller *host,
 
 	reinit_completion(&spi_engine->msg_complete);
 
+	if (trace_spi_transfer_start_enabled()) {
+		struct spi_transfer *xfer;
+
+		list_for_each_entry(xfer, &msg->transfers, transfer_list)
+			trace_spi_transfer_start(msg, xfer);
+	}
+
 	spin_lock_irqsave(&spi_engine->lock, flags);
 
 	if (spi_engine_write_cmd_fifo(spi_engine, msg))
@@ -617,6 +625,13 @@  static int spi_engine_transfer_one_message(struct spi_controller *host,
 		msg->status = -ETIMEDOUT;
 	}
 
+	if (trace_spi_transfer_stop_enabled()) {
+		struct spi_transfer *xfer;
+
+		list_for_each_entry(xfer, &msg->transfers, transfer_list)
+			trace_spi_transfer_stop(msg, xfer);
+	}
+
 	spi_finalize_current_message(host);
 
 	return msg->status;