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Commit 2db84eff authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

Drivers: hv: vmbus: Implement the protocol for tearing down vmbus state 



Implement the protocol for tearing down the monitor state established with
the host.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Tested-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent db9ba208

drivers/hv/channel_mgmt.c

+25 −0
Original line number Diff line number Diff line
@@ -421,6 +421,30 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui 
	channel->target_vp = hv_context.vp_index[cur_cpu];

}



/*

 * vmbus_unload_response - Handler for the unload response.

 */

static void vmbus_unload_response(struct vmbus_channel_message_header *hdr)

{

	/*

	 * This is a global event; just wakeup the waiting thread.

	 * Once we successfully unload, we can cleanup the monitor state.

	 */

	complete(&vmbus_connection.unload_event);

}



void vmbus_initiate_unload(void)

{

	struct vmbus_channel_message_header hdr;



	init_completion(&vmbus_connection.unload_event);

	memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));

	hdr.msgtype = CHANNELMSG_UNLOAD;

	vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header));



	wait_for_completion(&vmbus_connection.unload_event);

}



/*

 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.

 *
@@ -717,6 +741,7 @@ struct vmbus_channel_message_table_entry 
	{CHANNELMSG_INITIATE_CONTACT,		0, NULL},

	{CHANNELMSG_VERSION_RESPONSE,		1, vmbus_onversion_response},

	{CHANNELMSG_UNLOAD,			0, NULL},

	{CHANNELMSG_UNLOAD_RESPONSE,		1, vmbus_unload_response},

};



/*

drivers/hv/connection.c

+5 −0
Original line number Diff line number Diff line
@@ -227,6 +227,11 @@ int vmbus_connect(void) 


void vmbus_disconnect(void)

{

	/*

	 * First send the unload request to the host.

	 */

	vmbus_initiate_unload();



	if (vmbus_connection.work_queue) {

		drain_workqueue(vmbus_connection.work_queue);

		destroy_workqueue(vmbus_connection.work_queue);

drivers/hv/hyperv_vmbus.h

+2 −0
Original line number Diff line number Diff line
@@ -647,6 +647,7 @@ struct vmbus_connection { 


	atomic_t next_gpadl_handle;



	struct completion  unload_event;

	/*

	 * Represents channel interrupts. Each bit position represents a

	 * channel.  When a channel sends an interrupt via VMBUS, it finds its
@@ -741,6 +742,7 @@ void hv_vss_onchannelcallback(void *); 
int hv_fcopy_init(struct hv_util_service *);

void hv_fcopy_deinit(void);

void hv_fcopy_onchannelcallback(void *);

void vmbus_initiate_unload(void);



static inline void hv_poll_channel(struct vmbus_channel *channel,

				   void (*cb)(void *))

drivers/hv/vmbus_drv.c

+1 −1
Original line number Diff line number Diff line
@@ -1106,6 +1106,7 @@ static void __exit vmbus_exit(void) 


	vmbus_connection.conn_state = DISCONNECTED;

	hv_synic_clockevents_cleanup();

	vmbus_disconnect();

	hv_remove_vmbus_irq();

	vmbus_free_channels();

	if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
@@ -1118,7 +1119,6 @@ static void __exit vmbus_exit(void) 
		smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);

	acpi_bus_unregister_driver(&vmbus_acpi_driver);

	hv_cpu_hotplug_quirk(false);

	vmbus_disconnect();

}

include/linux/hyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -389,6 +389,7 @@ enum vmbus_channel_message_type { 
	CHANNELMSG_INITIATE_CONTACT		= 14,

	CHANNELMSG_VERSION_RESPONSE		= 15,

	CHANNELMSG_UNLOAD			= 16,

	CHANNELMSG_UNLOAD_RESPONSE		= 17,

	CHANNELMSG_COUNT

};