linux-imx

/*

 * Copyright (c) 2009, Microsoft Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple

 * Place - Suite 330, Boston, MA 02111-1307 USA.

 *

 * Authors:

 *   Haiyang Zhang <haiyangz@microsoft.com>

 *   Hank Janssen  <hjanssen@microsoft.com>

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/wait.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/hyperv.h>

#include <linux/uio.h>

#include <linux/interrupt.h>

#include <asm/page.h>

​

#include "hyperv_vmbus.h"

​

#define NUM_PAGES_SPANNED(addr, len) \

((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))

​

static unsigned long virt_to_hvpfn(void *addr)

{

    unsigned long paddr;

​

    if (is_vmalloc_addr(addr))

        paddr = page_to_phys(vmalloc_to_page(addr)) +

                     offset_in_page(addr);

    else

        paddr = __pa(addr);

​

    return  paddr >> PAGE_SHIFT;

}

​

/*

 * vmbus_setevent- Trigger an event notification on the specified

 * channel.

 */

void vmbus_setevent(struct vmbus_channel *channel)

{

    struct hv_monitor_page *monitorpage;

​

    trace_vmbus_setevent(channel);

​

    /*

     * For channels marked as in "low latency" mode