LXR linux/drivers/misc/vmw_vmci/vmci

   1/*
   2 * VMware VMCI Driver
   3 *
   4 * Copyright (C) 2012 VMware, Inc. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the
   8 * Free Software Foundation version 2 and no later version.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13 * for more details.
  14 */
  15
  16#ifndef _VMCI_DATAGRAM_H_
  17#define _VMCI_DATAGRAM_H_
  18
  19#include <linux/types.h>
  20#include <linux/list.h>
  21
  22#include "vmci_context.h"
  23
  24#define VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE 256
  25
  26/*
  27 * The struct vmci_datagram_queue_entry is a queue header for the in-kernel VMCI
  28 * datagram queues. It is allocated in non-paged memory, as the
  29 * content is accessed while holding a spinlock. The pending datagram
  30 * itself may be allocated from paged memory. We shadow the size of
  31 * the datagram in the non-paged queue entry as this size is used
  32 * while holding the same spinlock as above.
  33 */
  34struct vmci_datagram_queue_entry {
  35        struct list_head list_item;     /* For queuing. */
  36        size_t dg_size;         /* Size of datagram. */
  37        struct vmci_datagram *dg;       /* Pending datagram. */
  38};
  39
  40/* VMCIDatagramSendRecvInfo */
  41struct vmci_datagram_snd_rcv_info {
  42        u64 addr;
  43        u32 len;
  44        s32 result;
  45};
  46
  47/* Datagram API for non-public use. */
  48int vmci_datagram_dispatch(u32 context_id, struct vmci_datagram *dg,
  49                           bool from_guest);
  50int vmci_datagram_invoke_guest_handler(struct vmci_datagram *dg);
  51
  52#endif /* _VMCI_DATAGRAM_H_ */
  53