From: Andrew Jeffery <and...@aj.id.au> An observation from trace output of the existing FSI tracepoints was that the remote device was sometimes reporting as busy. Add a new tracepoint reporting the busy count in order to get a better grip on how often this is the case.
Signed-off-by: Andrew Jeffery <and...@aj.id.au> Acked-by: Eddie James <eaja...@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> --- drivers/fsi/fsi-master-gpio.c | 3 +++ include/trace/events/fsi_master_gpio.h | 16 ++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c index 3f487449a277..2a49b167effe 100644 --- a/drivers/fsi/fsi-master-gpio.c +++ b/drivers/fsi/fsi-master-gpio.c @@ -401,6 +401,9 @@ static int poll_for_response(struct fsi_master_gpio *master, break; } + if (busy_count > 0) + trace_fsi_master_gpio_poll_response_busy(master, busy_count); + /* Clock the slave enough to be ready for next operation */ clock_zeros(master, FSI_GPIO_PRIME_SLAVE_CLOCKS); return rc; diff --git a/include/trace/events/fsi_master_gpio.h b/include/trace/events/fsi_master_gpio.h index f95cf3264bf9..33e928c5acf3 100644 --- a/include/trace/events/fsi_master_gpio.h +++ b/include/trace/events/fsi_master_gpio.h @@ -64,6 +64,22 @@ TRACE_EVENT(fsi_master_gpio_break, ) ); + +TRACE_EVENT(fsi_master_gpio_poll_response_busy, + TP_PROTO(const struct fsi_master_gpio *master, int busy), + TP_ARGS(master, busy), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, busy) + ), + TP_fast_assign( + __entry->master_idx = master->master.idx; + __entry->busy = busy; + ), + TP_printk("fsi-gpio%d: device reported busy %d times", + __entry->master_idx, __entry->busy) +); + #endif /* _TRACE_FSI_MASTER_GPIO_H */ #include <trace/define_trace.h> -- 2.17.0