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fsi: gpio: Trace busy count 

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 <andrew@aj.id.au>
Acked-by: Eddie James <eajames@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Andrew Jeffery 2018-02-20 14:48:33 +10:30 committed by Benjamin Herrenschmidt
parent 8efcf34a26
commit 918da95176
2 changed files with 19 additions and 0 deletions
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3
drivers/fsi/fsi-master-gpio.c
View File

@ -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;

16
include/trace/events/fsi_master_gpio.h
View File

@ -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>