drivers/staging/hv/vmbus_private.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #ifndef _VMBUS_PRIVATE_H_
  26 #define _VMBUS_PRIVATE_H_
  27
  28 #include "hv.h"
  29 #include "vmbus_api.h"
  30 #include "channel.h"
  31 #include "channel_mgmt.h"
  32 #include "ring_buffer.h"
  33 #include <linux/list.h>
  34 #include <asm/sync_bitops.h>
  35
  36
  37 /*
  38  * Maximum channels is determined by the size of the interrupt page
  39  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
  40  * and the other is receive endpoint interrupt
  41  */
  42 #define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
  43
  44 /* The value here must be in multiple of 32 */
  45 /* TODO: Need to make this configurable */
  46 #define MAX_NUM_CHANNELS_SUPPORTED      256
  47
  48
  49 enum vmbus_connect_state {
  50         DISCONNECTED,
  51         CONNECTING,
  52         CONNECTED,
  53         DISCONNECTING
  54 };
  55
  56 #define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
  57
  58 struct vmbus_connection {
  59         enum vmbus_connect_state conn_state;
  60
  61         atomic_t next_gpadl_handle;
  62
  63         /*
  64          * Represents channel interrupts. Each bit position represents a
  65          * channel.  When a channel sends an interrupt via VMBUS, it finds its
  66          * bit in the sendInterruptPage, set it and calls Hv to generate a port
  67          * event. The other end receives the port event and parse the
  68          * recvInterruptPage to see which bit is set
  69          */
  70         void *int_page;
  71         void *send_int_page;
  72         void *recv_int_page;
  73
  74         /*
  75          * 2 pages - 1st page for parent->child notification and 2nd
  76          * is child->parent notification
  77          */
  78         void *monitor_pages;
  79         struct list_head chn_msg_list;
  80         spinlock_t channelmsg_lock;
  81
  82         /* List of channels */
  83         struct list_head chn_list;
  84         spinlock_t channel_lock;
  85
  86         struct workqueue_struct *work_queue;
  87 };
  88
  89
  90 struct vmbus_msginfo {
  91         /* Bookkeeping stuff */
  92         struct list_head msglist_entry;
  93
  94         /* Synchronize the request/response if needed */
  95         int wait_condition;
  96         wait_queue_head_t  wait_event;
  97
  98         /* The message itself */
  99         unsigned char msg[0];
 100 };
 101
 102
 103 extern struct vmbus_connection vmbus_connection;
 104
 105 /* General vmbus interface */
 106
 107 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
 108                                          struct hv_guid *instance,
 109                                          struct vmbus_channel *channel);
 110
 111 int vmbus_child_device_register(struct hv_device *child_device_obj);
 112 void vmbus_child_device_unregister(struct hv_device *device_obj);
 113
 114 /* static void */
 115 /* VmbusChildDeviceDestroy( */
 116 /* struct hv_device *); */
 117
 118 struct vmbus_channel *relid2channel(u32 relid);
 119
 120
 121 /* Connection interface */
 122
 123 int vmbus_connect(void);
 124
 125 int vmbus_disconnect(void);
 126
 127 int vmbus_post_msg(void *buffer, size_t buflen);
 128
 129 int vmbus_set_event(u32 child_relid);
 130
 131 void vmbus_on_event(unsigned long data);
 132
 133
 134 #endif /* _VMBUS_PRIVATE_H_ */