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/*
*
* 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>
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include "osd.h"
struct osd_callback_struct {
struct work_struct work;
void (*callback)(void *);
void *data;
};
void *osd_VirtualAllocExec(unsigned int size)
{
#ifdef __x86_64__
return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL_EXEC);
#else
return __vmalloc(size, GFP_KERNEL,
__pgprot(__PAGE_KERNEL & (~_PAGE_NX)));
#endif
}
/**
* osd_PageAlloc() - Allocate pages
* @count: Total number of Kernel pages you want to allocate
*
* Tries to allocate @count number of consecutive free kernel pages.
* And if successful, it will set the pages to 0 before returning.
* If successfull it will return pointer to the @count pages.
* Mainly used by Hyper-V drivers.
*/
void *osd_PageAlloc(unsigned int count)
{
void *p;
p = (void *)__get_free_pages(GFP_KERNEL, get_order(count * PAGE_SIZE));
if (p)
memset(p, 0, count * PAGE_SIZE);
return p;
/* struct page* page = alloc_page(GFP_KERNEL|__GFP_ZERO); */
/* void *p; */
/* BUGBUG: We need to use kmap in case we are in HIMEM region */
/* p = page_address(page); */
/* if (p) memset(p, 0, PAGE_SIZE); */
/* return p; */
}
EXPORT_SYMBOL_GPL(osd_PageAlloc);
/**
* osd_PageFree() - Free pages
* @page: Pointer to the first page to be freed
* @count: Total number of Kernel pages you free
*
* Frees the pages allocated by osd_PageAlloc()
* Mainly used by Hyper-V drivers.
*/
void osd_PageFree(void *page, unsigned int count)
{
free_pages((unsigned long)page, get_order(count * PAGE_SIZE));
/*struct page* p = virt_to_page(page);
__free_page(p);*/
}
EXPORT_SYMBOL_GPL(osd_PageFree);
/**
* osd_WaitEventCreate() - Create the event queue
*
* Allocates memory for a &struct osd_waitevent. And then calls
* init_waitqueue_head to set up the wait queue for the event.
* This structure is usually part of a another structure that contains
* the actual Hyper-V device driver structure.
*
* Returns pointer to &struct osd_waitevent
* Mainly used by Hyper-V drivers.
*/
struct osd_waitevent *osd_WaitEventCreate(void)
{
struct osd_waitevent *wait = kmalloc(sizeof(struct osd_waitevent),
GFP_KERNEL);
if (!wait)
return NULL;
wait->condition = 0;
init_waitqueue_head(&wait->event);
return wait;
}
EXPORT_SYMBOL_GPL(osd_WaitEventCreate);
/**
* osd_WaitEventSet() - Wake up the process
* @waitEvent: Structure to event to be woken up
*
* @waitevent is of type &struct osd_waitevent
*
* Wake up the sleeping process so it can do some work.
* And set condition indicator in &struct osd_waitevent to indicate
* the process is in a woken state.
*
* Only used by Network and Storage Hyper-V drivers.
*/
void osd_WaitEventSet(struct osd_waitevent *waitEvent)
{
waitEvent->condition = 1;
wake_up_interruptible(&waitEvent->event);
}
EXPORT_SYMBOL_GPL(osd_WaitEventSet);
/**
* osd_WaitEventWait() - Wait for event till condition is true
* @waitEvent: Structure to event to be put to sleep
*
* @waitevent is of type &struct osd_waitevent
*
* Set up the process to sleep until waitEvent->condition get true.
* And set condition indicator in &struct osd_waitevent to indicate
* the process is in a sleeping state.
*
* Returns the status of 'wait_event_interruptible()' system call
*
* Mainly used by Hyper-V drivers.
*/
int osd_WaitEventWait(struct osd_waitevent *waitEvent)
{
int ret = 0;
ret = wait_event_interruptible(waitEvent->event,
waitEvent->condition);
waitEvent->condition = 0;
return ret;
}
EXPORT_SYMBOL_GPL(osd_WaitEventWait);
/**
* osd_WaitEventWaitEx() - Wait for event or timeout for process wakeup
* @waitEvent: Structure to event to be put to sleep
* @TimeoutInMs: Total number of Milliseconds to wait before waking up
*
* @waitevent is of type &struct osd_waitevent
* Set up the process to sleep until @waitEvent->condition get true or
* @TimeoutInMs (Time out in Milliseconds) has been reached.
* And set condition indicator in &struct osd_waitevent to indicate
* the process is in a sleeping state.
*
* Returns the status of 'wait_event_interruptible_timeout()' system call
*
* Mainly used by Hyper-V drivers.
*/
int osd_WaitEventWaitEx(struct osd_waitevent *waitEvent, u32 TimeoutInMs)
{
int ret = 0;
ret = wait_event_interruptible_timeout(waitEvent->event,
waitEvent->condition,
msecs_to_jiffies(TimeoutInMs));
waitEvent->condition = 0;
return ret;
}
EXPORT_SYMBOL_GPL(osd_WaitEventWaitEx);
static void osd_callback_work(struct work_struct *work)
{
struct osd_callback_struct *cb = container_of(work,
struct osd_callback_struct,
work);
(cb->callback)(cb->data);
kfree(cb);
}
int osd_schedule_callback(struct workqueue_struct *wq,
void (*func)(void *),
void *data)
{
struct osd_callback_struct *cb;
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
if (!cb) {
printk(KERN_ERR "unable to allocate memory in osd_schedule_callback\n");
return -1;
}
cb->callback = func;
cb->data = data;
INIT_WORK(&cb->work, osd_callback_work);
return queue_work(wq, &cb->work);
}
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