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hyper-v: trace vmbus_on_msg_dpc()

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Add tracing subsystem to Hyper-V VMBus module and add tracepoint
to vmbus_on_msg_dpc() which is called when we receive a message from host.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2017-10-29 12:21:00 -07:00 committed by Greg Kroah-Hartman
parent 32946cc2d5
commit c9fe0f8fa4
5 changed files with 40 additions and 1 deletions
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4
drivers/hv/Makefile
View file

@ -2,7 +2,9 @@ obj-$(CONFIG_HYPERV) += hv_vmbus.o
obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
CFLAGS_hv_trace.o = -I$(src)
hv_vmbus-y := vmbus_drv.o \
hv.o connection.o channel.o \
channel_mgmt.o ring_buffer.o
channel_mgmt.o ring_buffer.o hv_trace.o
hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o hv_utils_transport.o

4
drivers/hv/hv_trace.c Normal file
View file

@ -0,0 +1,4 @@
#include "hyperv_vmbus.h"
#define CREATE_TRACE_POINTS
#include "hv_trace.h"

29
drivers/hv/hv_trace.h Normal file
View file

@ -0,0 +1,29 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM hyperv
#if !defined(_HV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#define _HV_TRACE_H
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(vmbus_hdr_msg,
TP_PROTO(const struct vmbus_channel_message_header *hdr),
TP_ARGS(hdr),
TP_STRUCT__entry(__field(unsigned int, msgtype)),
TP_fast_assign(__entry->msgtype = hdr->msgtype;),
TP_printk("msgtype=%u", __entry->msgtype)
);
DEFINE_EVENT(vmbus_hdr_msg, vmbus_on_msg_dpc,
TP_PROTO(const struct vmbus_channel_message_header *hdr),
TP_ARGS(hdr)
);
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE hv_trace
#endif /* _HV_TRACE_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

2
drivers/hv/hyperv_vmbus.h
View file

@ -31,6 +31,8 @@
#include <linux/hyperv.h>
#include <linux/interrupt.h>
#include "hv_trace.h"
/*
* Timeout for services such as KVP and fcopy.
*/

2
drivers/hv/vmbus_drv.c
View file

@ -835,6 +835,8 @@ void vmbus_on_msg_dpc(unsigned long data)
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
trace_vmbus_on_msg_dpc(hdr);
if (hdr->msgtype >= CHANNELMSG_COUNT) {
WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
goto msg_handled;