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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: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
K. Y. Srinivasan 2015-04-22 21:31:32 -07:00 committed by Greg Kroah-Hartman
parent db9ba2088f
commit 2db84eff12
5 changed files with 34 additions and 1 deletions
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25
drivers/hv/channel_mgmt.c
View File

@ -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},
};
/*

5
drivers/hv/connection.c
View File

@ -227,6 +227,11 @@ cleanup:
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);

2
drivers/hv/hyperv_vmbus.h
View File

@ -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 *))

2
drivers/hv/vmbus_drv.c
View File

@ -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();
}

1
include/linux/hyperv.h
View File

@ -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
};