linux-kernel - [PATCH RFC 3/4] drivers: irqchip: pdc: log PDC info in FTRACE

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Date:   Tue, 23 Jan 2018 10:56:55 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        asathyak@...eaurora.org, Lina Iyer <ilina@...eaurora.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH RFC 3/4] drivers: irqchip: pdc: log PDC info in FTRACE

From: Archana Sathyakumar <asathyak@...eaurora.org>

Log key PDC pin configuration in FTRACE.

Cc: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Archana Sathyakumar <asathyak@...eaurora.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---
 drivers/irqchip/qcom-pdc.c |  6 ++++++
 include/trace/events/pdc.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 include/trace/events/pdc.h

diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index 57f1348bd81c..9b626e9f3a29 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -26,6 +26,8 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#define CREATE_TRACE_POINTS
+#include "trace/events/pdc.h"
 
 #include "qcom-pdc.h"
 
@@ -78,6 +80,7 @@ static inline void pdc_enable_intr(struct irq_data *d, bool on)
 			break;
 		udelay(5);
 	} while (1);
+	trace_irq_pin_config("enable", (u32)pin_out, (u32)d->hwirq, 0, on);
 	spin_unlock_irqrestore(&pdc_lock, flags);
 	WARN_ON(r_enable != enable);
 }
@@ -161,6 +164,9 @@ static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
 		udelay(5);
 	} while (1);
 
+	trace_irq_pin_config("type_config", (u32)pin_out, (u32)d->hwirq,
+				pdc_type, 0);
+
 	/*
 	 * If type is edge triggered, forward that as Rising edge as PDC
 	 * takes care of converting falling edge to rising edge signal
diff --git a/include/trace/events/pdc.h b/include/trace/events/pdc.h
new file mode 100644
index 000000000000..bec54c414880
--- /dev/null
+++ b/include/trace/events/pdc.h
@@ -0,0 +1,50 @@
+/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM pdc
+
+#if !defined(_TRACE_PDC_) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_PDC_H_
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(irq_pin_config,
+
+	TP_PROTO(char *func, u32 pin, u32 hwirq, u32 type, u32 enable),
+
+	TP_ARGS(func, pin, hwirq, type, enable),
+
+	TP_STRUCT__entry(
+		__field(char *, func)
+		__field(u32, pin)
+		__field(u32, hwirq)
+		__field(u32, type)
+		__field(u32, enable)
+	),
+
+	TP_fast_assign(
+		__entry->pin = pin;
+		__entry->func = func;
+		__entry->hwirq = hwirq;
+		__entry->type = type;
+		__entry->enable = enable;
+	),
+
+	TP_printk("%s hwirq:%u pin:%u type:%u enable:%u",
+		__entry->func, __entry->pin, __entry->hwirq, __entry->type,
+		__entry->enable)
+);
+
+#endif
+#define TRACE_INCLUDE_FILE pdc
+#include <trace/define_trace.h>
-- 
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