Staging: hv: Added new hv_utils driver with shutdown as first functionality
Addition of new driver for Hyper-V called hv_utils.
This driver is intended to support things like KVP, Timesync, Heartbeat etc.
This first release has support for Gracefull shutdown.
e.g. Select shutdown from the Hyper-V main admin screen and the Linux VM
will do a gracefull shutdown.
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/hv/Channel.c b/drivers/staging/hv/Channel.c
index 328d3a0..de2ccb1 100644
--- a/drivers/staging/hv/Channel.c
+++ b/drivers/staging/hv/Channel.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
+#include <linux/module.h>
#include "osd.h"
#include "logging.h"
#include "VmbusPrivate.h"
@@ -666,8 +667,19 @@
DPRINT_EXIT(VMBUS);
}
-/*
- * VmbusChannelSendPacket - Send the specified buffer on the given channel
+/**
+ * VmbusChannelSendPacket() - Send the specified buffer on the given channel
+ * @Channel: Pointer to vmbus_channel structure.
+ * @Buffer: Pointer to the buffer you want to receive the data into.
+ * @BufferLen: Maximum size of what the the buffer will hold
+ * @RequestId: Identifier of the request
+ * @vmbus_packet_type: Type of packet that is being send e.g. negotiate, time
+ * packet etc.
+ *
+ * Sends data in @Buffer directly to hyper-v via the vmbus
+ * This will send the data unparsed to hyper-v.
+ *
+ * Mainly used by Hyper-V drivers.
*/
int VmbusChannelSendPacket(struct vmbus_channel *Channel, const void *Buffer,
u32 BufferLen, u64 RequestId,
@@ -711,6 +723,7 @@
return ret;
}
+EXPORT_SYMBOL(VmbusChannelSendPacket);
/*
* VmbusChannelSendPacketPageBuffer - Send a range of single-page buffer
@@ -848,10 +861,20 @@
return ret;
}
-/*
- * VmbusChannelRecvPacket - Retrieve the user packet on the specified channel
+
+/**
+ * VmbusChannelRecvPacket() - Retrieve the user packet on the specified channel
+ * @Channel: Pointer to vmbus_channel structure.
+ * @Buffer: Pointer to the buffer you want to receive the data into.
+ * @BufferLen: Maximum size of what the the buffer will hold
+ * @BufferActualLen: The actual size of the data after it was received
+ * @RequestId: Identifier of the request
+ *
+ * Receives directly from the hyper-v vmbus and puts the data it received
+ * into Buffer. This will receive the data unparsed from hyper-v.
+ *
+ * Mainly used by Hyper-V drivers.
*/
-/* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */
int VmbusChannelRecvPacket(struct vmbus_channel *Channel, void *Buffer,
u32 BufferLen, u32 *BufferActualLen, u64 *RequestId)
{
@@ -913,6 +936,7 @@
return 0;
}
+EXPORT_SYMBOL(VmbusChannelRecvPacket);
/*
* VmbusChannelRecvPacketRaw - Retrieve the raw packet on the specified channel
