4b2f9abea5
The additional abstraction is unneeded. The three calls are assumed to not be pending simultaneously: - vmbus_onoffer queues work exactly once when a new channel is created, the channel is not attached to lists until the work is executed - vmbus_onoffer_rescind is received only when the channel is active it is enough to process the work once - free_channel is called exactly once when the channel is getting destroyed; I assumed that vmbus_process_rescind_offer cannot be pending while free_channel is called Reviewed-By: Hank Janssen <hjanssen@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
320 lines
8.6 KiB
C
320 lines
8.6 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#ifndef _CHANNEL_MGMT_H_
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#define _CHANNEL_MGMT_H_
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#include <linux/list.h>
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#include <linux/timer.h>
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#include "ring_buffer.h"
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#include "vmbus_channel_interface.h"
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#include "vmbus_packet_format.h"
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/* Version 1 messages */
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enum vmbus_channel_message_type {
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CHANNELMSG_INVALID = 0,
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CHANNELMSG_OFFERCHANNEL = 1,
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CHANNELMSG_RESCIND_CHANNELOFFER = 2,
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CHANNELMSG_REQUESTOFFERS = 3,
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CHANNELMSG_ALLOFFERS_DELIVERED = 4,
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CHANNELMSG_OPENCHANNEL = 5,
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CHANNELMSG_OPENCHANNEL_RESULT = 6,
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CHANNELMSG_CLOSECHANNEL = 7,
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CHANNELMSG_GPADL_HEADER = 8,
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CHANNELMSG_GPADL_BODY = 9,
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CHANNELMSG_GPADL_CREATED = 10,
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CHANNELMSG_GPADL_TEARDOWN = 11,
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CHANNELMSG_GPADL_TORNDOWN = 12,
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CHANNELMSG_RELID_RELEASED = 13,
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CHANNELMSG_INITIATE_CONTACT = 14,
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CHANNELMSG_VERSION_RESPONSE = 15,
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CHANNELMSG_UNLOAD = 16,
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#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
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CHANNELMSG_VIEWRANGE_ADD = 17,
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CHANNELMSG_VIEWRANGE_REMOVE = 18,
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#endif
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CHANNELMSG_COUNT
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};
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struct vmbus_channel_message_header {
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enum vmbus_channel_message_type msgtype;
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u32 padding;
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} __attribute__((packed));
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/* Query VMBus Version parameters */
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struct vmbus_channel_query_vmbus_version {
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struct vmbus_channel_message_header header;
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u32 version;
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} __attribute__((packed));
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/* VMBus Version Supported parameters */
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struct vmbus_channel_version_supported {
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struct vmbus_channel_message_header header;
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bool version_supported;
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} __attribute__((packed));
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/* Offer Channel parameters */
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struct vmbus_channel_offer_channel {
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struct vmbus_channel_message_header header;
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struct vmbus_channel_offer offer;
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u32 child_relid;
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u8 monitorid;
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bool monitor_allocated;
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} __attribute__((packed));
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/* Rescind Offer parameters */
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struct vmbus_channel_rescind_offer {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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} __attribute__((packed));
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/*
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* Request Offer -- no parameters, SynIC message contains the partition ID
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* Set Snoop -- no parameters, SynIC message contains the partition ID
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* Clear Snoop -- no parameters, SynIC message contains the partition ID
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* All Offers Delivered -- no parameters, SynIC message contains the partition
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* ID
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* Flush Client -- no parameters, SynIC message contains the partition ID
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*/
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/* Open Channel parameters */
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struct vmbus_channel_open_channel {
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struct vmbus_channel_message_header header;
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/* Identifies the specific VMBus channel that is being opened. */
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u32 child_relid;
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/* ID making a particular open request at a channel offer unique. */
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u32 openid;
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/* GPADL for the channel's ring buffer. */
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u32 ringbuffer_gpadlhandle;
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/* GPADL for the channel's server context save area. */
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u32 server_contextarea_gpadlhandle;
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/*
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* The upstream ring buffer begins at offset zero in the memory
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* described by RingBufferGpadlHandle. The downstream ring buffer
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* follows it at this offset (in pages).
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*/
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u32 downstream_ringbuffer_pageoffset;
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/* User-specific data to be passed along to the server endpoint. */
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unsigned char userdata[MAX_USER_DEFINED_BYTES];
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} __attribute__((packed));
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/* Open Channel Result parameters */
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struct vmbus_channel_open_result {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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u32 openid;
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u32 status;
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} __attribute__((packed));
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/* Close channel parameters; */
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struct vmbus_channel_close_channel {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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} __attribute__((packed));
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/* Channel Message GPADL */
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#define GPADL_TYPE_RING_BUFFER 1
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#define GPADL_TYPE_SERVER_SAVE_AREA 2
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#define GPADL_TYPE_TRANSACTION 8
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/*
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* The number of PFNs in a GPADL message is defined by the number of
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* pages that would be spanned by ByteCount and ByteOffset. If the
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* implied number of PFNs won't fit in this packet, there will be a
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* follow-up packet that contains more.
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*/
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struct vmbus_channel_gpadl_header {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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u32 gpadl;
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u16 range_buflen;
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u16 rangecount;
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struct gpa_range range[0];
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} __attribute__((packed));
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/* This is the followup packet that contains more PFNs. */
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struct vmbus_channel_gpadl_body {
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struct vmbus_channel_message_header header;
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u32 msgnumber;
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u32 gpadl;
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u64 pfn[0];
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} __attribute__((packed));
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struct vmbus_channel_gpadl_created {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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u32 gpadl;
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u32 creation_status;
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} __attribute__((packed));
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struct vmbus_channel_gpadl_teardown {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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u32 gpadl;
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} __attribute__((packed));
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struct vmbus_channel_gpadl_torndown {
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struct vmbus_channel_message_header header;
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u32 gpadl;
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} __attribute__((packed));
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#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
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struct vmbus_channel_view_range_add {
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struct vmbus_channel_message_header header;
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PHYSICAL_ADDRESS viewrange_base;
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u64 viewrange_length;
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u32 child_relid;
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} __attribute__((packed));
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struct vmbus_channel_view_range_remove {
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struct vmbus_channel_message_header header;
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PHYSICAL_ADDRESS viewrange_base;
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u32 child_relid;
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} __attribute__((packed));
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#endif
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struct vmbus_channel_relid_released {
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struct vmbus_channel_message_header header;
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u32 child_relid;
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} __attribute__((packed));
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struct vmbus_channel_initiate_contact {
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struct vmbus_channel_message_header header;
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u32 vmbus_version_requested;
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u32 padding2;
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u64 interrupt_page;
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u64 monitor_page1;
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u64 monitor_page2;
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} __attribute__((packed));
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struct vmbus_channel_version_response {
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struct vmbus_channel_message_header header;
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bool version_supported;
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} __attribute__((packed));
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enum vmbus_channel_state {
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CHANNEL_OFFER_STATE,
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CHANNEL_OPENING_STATE,
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CHANNEL_OPEN_STATE,
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};
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struct vmbus_channel {
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struct list_head listentry;
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struct hv_device *device_obj;
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struct timer_list poll_timer; /* SA-111 workaround */
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struct work_struct work;
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enum vmbus_channel_state state;
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struct vmbus_channel_offer_channel offermsg;
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/*
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* These are based on the OfferMsg.MonitorId.
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* Save it here for easy access.
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*/
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u8 monitor_grp;
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u8 monitor_bit;
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u32 ringbuffer_gpadlhandle;
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/* Allocated memory for ring buffer */
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void *ringbuffer_pages;
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u32 ringbuffer_pagecount;
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struct hv_ring_buffer_info outbound; /* send to parent */
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struct hv_ring_buffer_info inbound; /* receive from parent */
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spinlock_t inbound_lock;
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struct workqueue_struct *controlwq;
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/* Channel callback are invoked in this workqueue context */
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/* HANDLE dataWorkQueue; */
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void (*onchannel_callback)(void *context);
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void *channel_callback_context;
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};
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struct vmbus_channel_debug_info {
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u32 relid;
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enum vmbus_channel_state state;
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struct hv_guid interfacetype;
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struct hv_guid interface_instance;
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u32 monitorid;
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u32 servermonitor_pending;
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u32 servermonitor_latency;
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u32 servermonitor_connectionid;
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u32 clientmonitor_pending;
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u32 clientmonitor_latency;
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u32 clientmonitor_connectionid;
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struct hv_ring_buffer_debug_info inbound;
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struct hv_ring_buffer_debug_info outbound;
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};
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/*
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* Represents each channel msg on the vmbus connection This is a
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* variable-size data structure depending on the msg type itself
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*/
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struct vmbus_channel_msginfo {
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/* Bookkeeping stuff */
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struct list_head msglistentry;
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/* So far, this is only used to handle gpadl body message */
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struct list_head submsglist;
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/* Synchronize the request/response if needed */
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struct osd_waitevent *waitevent;
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union {
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struct vmbus_channel_version_supported version_supported;
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struct vmbus_channel_open_result open_result;
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struct vmbus_channel_gpadl_torndown gpadl_torndown;
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struct vmbus_channel_gpadl_created gpadl_created;
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struct vmbus_channel_version_response version_response;
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} response;
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u32 msgsize;
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/*
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* The channel message that goes out on the "wire".
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* It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
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*/
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unsigned char msg[0];
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};
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void free_channel(struct vmbus_channel *channel);
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void vmbus_onmessage(void *context);
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int vmbus_request_offers(void);
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void vmbus_release_unattached_channels(void);
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#endif /* _CHANNEL_MGMT_H_ */
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