[PATCH] spi: axi-spi-engine: Emit trace events for spi transfers
From: Uwe Kleine-König <hidden>
Date: 2024-10-31 11:17:00
Also in:
linux-spi
Subsystem:
axi spi engine, spi subsystem, the rest · Maintainers:
Michael Hennerich, Nuno Sá, Mark Brown, Linus Torvalds
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 <redacted> --- drivers/spi/spi-axi-spi-engine.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
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;
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc -- 2.45.2