drivers/fsi/gpio: Add tracepoints for GPIO master

Trace low level input/output GPIO operations.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 77 insertions, 0 deletions

diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index d467e61065a9..a5d6e705b3c5 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -61,6 +61,9 @@ struct fsi_master_gpio {
         struct gpio_desc        *gpio_mux;      /* Mux control */
 };
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/fsi_master_gpio.h>
+
 #define to_fsi_master_gpio(m) container_of(m, struct fsi_master_gpio, master)
 
 struct fsi_gpio_msg {
@@ -126,6 +129,8 @@ static void serial_in(struct fsi_master_gpio *master, struct fsi_gpio_msg *msg,
                 msg->msg |= ~in_bit & 0x1;      /* Data is active low */
         }
         msg->bits += num_bits;
+
+        trace_fsi_master_gpio_in(master, num_bits, msg->msg);
 }
 
 static void serial_out(struct fsi_master_gpio *master,
@@ -137,6 +142,8 @@ static void serial_out(struct fsi_master_gpio *master,
         uint64_t last_bit = ~0;
         int next_bit;
 
+        trace_fsi_master_gpio_out(master, cmd->bits, cmd->msg);
+
         if (!cmd->bits) {
                 dev_warn(master->dev, "trying to output 0 bits\n");
                 return;
@@ -458,6 +465,8 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link)
         if (link != 0)
                 return -ENODEV;
 
+        trace_fsi_master_gpio_break(master);
+
         set_sda_output(master, 1);
         sda_out(master, 1);
         clock_toggle(master, FSI_PRE_BREAK_CLOCKS);
diff --git a/include/trace/events/fsi_master_gpio.h b/include/trace/events/fsi_master_gpio.h
new file mode 100644
index 000000000000..11b36c119048
--- /dev/null
+++ b/include/trace/events/fsi_master_gpio.h
@@ -0,0 +1,68 @@
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fsi_master_gpio
+
+#if !defined(_TRACE_FSI_MASTER_GPIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FSI_MASTER_GPIO_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(fsi_master_gpio_in,
+        TP_PROTO(const struct fsi_master_gpio *master, int bits, uint64_t msg),
+        TP_ARGS(master, bits, msg),
+        TP_STRUCT__entry(
+                __field(int,    master_idx)
+                __field(int,    bits)
+                __field(uint64_t, msg)
+        ),
+        TP_fast_assign(
+                __entry->master_idx = master->master.idx;
+                __entry->bits = bits;
+                __entry->msg  = msg & ((1ull<<bits) - 1);
+        ),
+        TP_printk("fsi-gpio%d => %0*llx[%d]",
+                __entry->master_idx,
+                (__entry->bits + 3) / 4,
+                __entry->msg,
+                __entry->bits
+        )
+);
+
+TRACE_EVENT(fsi_master_gpio_out,
+        TP_PROTO(const struct fsi_master_gpio *master, int bits, uint64_t msg),
+        TP_ARGS(master, bits, msg),
+        TP_STRUCT__entry(
+                __field(int,    master_idx)
+                __field(int,    bits)
+                __field(uint64_t, msg)
+        ),
+        TP_fast_assign(
+                __entry->master_idx = master->master.idx;
+                __entry->bits = bits;
+                __entry->msg  = msg & ((1ull<<bits) - 1);
+        ),
+        TP_printk("fsi-gpio%d <= %0*llx[%d]",
+                __entry->master_idx,
+                (__entry->bits + 3) / 4,
+                __entry->msg,
+                __entry->bits
+        )
+);
+
+TRACE_EVENT(fsi_master_gpio_break,
+        TP_PROTO(const struct fsi_master_gpio *master),
+        TP_ARGS(master),
+        TP_STRUCT__entry(
+                __field(int,    master_idx)
+        ),
+        TP_fast_assign(
+                __entry->master_idx = master->master.idx;
+        ),
+        TP_printk("fsi-gpio%d ----break---",
+                __entry->master_idx
+        )
+);
+
+#endif /* _TRACE_FSI_MASTER_GPIO_H */
+
+#include <trace/define_trace.h>