msm: tracing: Add ftrace support for RPM driver
Add trace event support to capture communications by the RPM driver. The
trace logs send/ack requests in the RPM driver.
Change-Id: I332c903b817a9dd79f263d0219a2bcd7ca94ef1f
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
diff --git a/Documentation/trace/events-rpm-smd.txt b/Documentation/trace/events-rpm-smd.txt
new file mode 100644
index 0000000..f6c6bef
--- /dev/null
+++ b/Documentation/trace/events-rpm-smd.txt
@@ -0,0 +1,43 @@
+Subsystem Trace Points: rpm_smd
+
+The rpm-smd tracing system captures the events related to sending/receiving
+messages to/from RPM hardware. The tracing system adds the following events to
+capture the transactions with the RPM driver.
+
+1) RPM send message
+===================
+rpm_send_message: ctx:%s set:%s rsc_type:0%x(%s),rsc_id:i0x%x, id:%u
+
+The event captures the parameters of the message that was sent to the RPM.
+
+The 'ctx' parameters takes one of the following string constants to indicate
+if the request was made in atomic/non-atomic context.
+ . "sleep" - non-atomic context
+ . "noslp" - atomic context
+
+The 'set' parameter takes one of the following string values to indicate if
+the message affects active or sleep set value of the resource
+ . "act" - active set configuraion
+ . "slp" - sleep set configuration
+
+The 'rsc_type' and 'rsc_id' identify the resource whose parametes is being
+modified. The 4 bytes string equivalent of the resource type is also displayed
+for easier identification of resources.
+
+The 'id' parameter is the id that RPM uses to acknowledge the receipt of the
+message in its ACK message
+
+
+2) RPM ack message
+=================
+rpm_ack_recd: ctx:%s id:%u
+
+The event captures the acknowledgement messages received from the RPM after
+successfully send a message request.
+
+The 'ctx' parameter has the same string constants referred to the "RPM Send
+Message"
+
+The 'id' parameter is the id that RPM uses to acknowledge the receipt of the
+message in its ACK message
+
diff --git a/arch/arm/mach-msm/rpm-smd.c b/arch/arm/mach-msm/rpm-smd.c
index 6d1d038..764fbeb 100644
--- a/arch/arm/mach-msm/rpm-smd.c
+++ b/arch/arm/mach-msm/rpm-smd.c
@@ -36,7 +36,8 @@
#include <mach/msm_smd.h>
#include <mach/rpm-smd.h>
#include "rpm-notifier.h"
-
+#define CREATE_TRACE_POINTS
+#include "trace_rpm_smd.h"
/* Debug Definitions */
enum {
@@ -773,6 +774,10 @@
spin_unlock_irqrestore(&msm_rpm_data.smd_lock_write, flags);
if (ret == msg_size) {
+ trace_rpm_send_message(noirq, cdata->msg_hdr.set,
+ cdata->msg_hdr.resource_type,
+ cdata->msg_hdr.resource_id,
+ cdata->msg_hdr.msg_id);
for (i = 0; (i < cdata->write_idx); i++)
cdata->kvp[i].valid = false;
cdata->msg_hdr.data_len = 0;
@@ -828,6 +833,8 @@
return 0;
wait_for_completion(&elem->ack);
+ trace_rpm_ack_recd(0, msg_id);
+
msm_rpm_free_list_entry(elem);
return elem->errno;
}
@@ -880,6 +887,8 @@
}
rc = elem->errno;
+ trace_rpm_ack_recd(1, msg_id);
+
msm_rpm_free_list_entry(elem);
wait_ack_cleanup:
spin_unlock_irqrestore(&msm_rpm_data.smd_lock_read, flags);
diff --git a/arch/arm/mach-msm/trace_rpm_smd.h b/arch/arm/mach-msm/trace_rpm_smd.h
new file mode 100644
index 0000000..eff4860
--- /dev/null
+++ b/arch/arm/mach-msm/trace_rpm_smd.h
@@ -0,0 +1,79 @@
+/* Copyright (c) 2012, 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 rpm_smd
+
+#if !defined(_TRACE_RPM_SMD_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RPM_SMD_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(rpm_ack_recd,
+
+ TP_PROTO(unsigned int irq, unsigned int msg_id),
+
+ TP_ARGS(irq, msg_id),
+
+ TP_STRUCT__entry(
+ __field(int, irq)
+ __field(int, msg_id)
+ ),
+
+ TP_fast_assign(
+ __entry->irq = irq;
+ __entry->msg_id = msg_id;
+ ),
+
+ TP_printk("ctx:%s id:%d",
+ __entry->irq ? "noslp" : "sleep",
+ __entry->msg_id)
+);
+
+TRACE_EVENT(rpm_send_message,
+
+ TP_PROTO(unsigned int irq, unsigned int set, unsigned int rsc_type,
+ unsigned int rsc_id, unsigned int msg_id),
+
+ TP_ARGS(irq, set, rsc_type, rsc_id, msg_id),
+
+ TP_STRUCT__entry(
+ __field(u32, irq)
+ __field(u32, set)
+ __field(u32, rsc_type)
+ __field(u32, rsc_id)
+ __field(u32, msg_id)
+ __array(char, name, 5)
+ ),
+
+ TP_fast_assign(
+ __entry->irq = irq;
+ __entry->name[4] = 0;
+ __entry->set = set;
+ __entry->rsc_type = rsc_type;
+ __entry->rsc_id = rsc_id;
+ __entry->msg_id = msg_id;
+ memcpy(__entry->name, &rsc_type, sizeof(uint32_t));
+
+ ),
+
+ TP_printk("ctx:%s set:%s rsc_type:0x%08x(%s), rsc_id:0x%08x, id:%d",
+ __entry->irq ? "noslp" : "sleep",
+ __entry->set ? "slp" : "act",
+ __entry->rsc_type, __entry->name,
+ __entry->rsc_id, __entry->msg_id)
+);
+#endif
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE trace_rpm_smd
+#include <trace/define_trace.h>