drivers/staging/hv/osd.c

   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 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/mm.h>
  28 #include <linux/highmem.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/ioport.h>
  31 #include <linux/irq.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/sched.h>
  34 #include <linux/wait.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/workqueue.h>
  37 #include <linux/kernel.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/delay.h>
  40 #include <linux/time.h>
  41 #include <linux/io.h>
  42 #include <linux/bitops.h>
  43 #include "osd.h"
  44
  45 struct osd_callback_struct {
  46         struct work_struct work;
  47         void (*callback)(void *);
  48         void *data;
  49 };
  50
  51 void *osd_VirtualAllocExec(unsigned int size)
  52 {
  53 #ifdef __x86_64__
  54         return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL_EXEC);
  55 #else
  56         return __vmalloc(size, GFP_KERNEL,
  57                          __pgprot(__PAGE_KERNEL & (~_PAGE_NX)));
  58 #endif
  59 }
  60
  61 void *osd_PageAlloc(unsigned int count)
  62 {
  63         void *p;
  64
  65         p = (void *)__get_free_pages(GFP_KERNEL, get_order(count * PAGE_SIZE));
  66         if (p)
  67                 memset(p, 0, count * PAGE_SIZE);
  68         return p;
  69
  70         /* struct page* page = alloc_page(GFP_KERNEL|__GFP_ZERO); */
  71         /* void *p; */
  72
  73         /* BUGBUG: We need to use kmap in case we are in HIMEM region */
  74         /* p = page_address(page); */
  75         /* if (p) memset(p, 0, PAGE_SIZE); */
  76         /* return p; */
  77 }
  78 EXPORT_SYMBOL_GPL(osd_PageAlloc);
  79
  80 void osd_PageFree(void *page, unsigned int count)
  81 {
  82         free_pages((unsigned long)page, get_order(count * PAGE_SIZE));
  83         /*struct page* p = virt_to_page(page);
  84         __free_page(p);*/
  85 }
  86 EXPORT_SYMBOL_GPL(osd_PageFree);
  87
  88 struct osd_waitevent *osd_WaitEventCreate(void)
  89 {
  90         struct osd_waitevent *wait = kmalloc(sizeof(struct osd_waitevent),
  91                                              GFP_KERNEL);
  92         if (!wait)
  93                 return NULL;
  94
  95         wait->condition = 0;
  96         init_waitqueue_head(&wait->event);
  97         return wait;
  98 }
  99 EXPORT_SYMBOL_GPL(osd_WaitEventCreate);
 100
 101 void osd_WaitEventSet(struct osd_waitevent *waitEvent)
 102 {
 103         waitEvent->condition = 1;
 104         wake_up_interruptible(&waitEvent->event);
 105 }
 106 EXPORT_SYMBOL_GPL(osd_WaitEventSet);
 107
 108 int osd_WaitEventWait(struct osd_waitevent *waitEvent)
 109 {
 110         int ret = 0;
 111
 112         ret = wait_event_interruptible(waitEvent->event,
 113                                        waitEvent->condition);
 114         waitEvent->condition = 0;
 115         return ret;
 116 }
 117 EXPORT_SYMBOL_GPL(osd_WaitEventWait);
 118
 119 int osd_WaitEventWaitEx(struct osd_waitevent *waitEvent, u32 TimeoutInMs)
 120 {
 121         int ret = 0;
 122
 123         ret = wait_event_interruptible_timeout(waitEvent->event,
 124                                                waitEvent->condition,
 125                                                msecs_to_jiffies(TimeoutInMs));
 126         waitEvent->condition = 0;
 127         return ret;
 128 }
 129 EXPORT_SYMBOL_GPL(osd_WaitEventWaitEx);
 130
 131 static void osd_callback_work(struct work_struct *work)
 132 {
 133         struct osd_callback_struct *cb = container_of(work,
 134                                                 struct osd_callback_struct,
 135                                                 work);
 136         (cb->callback)(cb->data);
 137         kfree(cb);
 138 }
 139
 140 int osd_schedule_callback(struct workqueue_struct *wq,
 141                           void (*func)(void *),
 142                           void *data)
 143 {
 144         struct osd_callback_struct *cb;
 145
 146         cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 147         if (!cb) {
 148                 printk(KERN_ERR "unable to allocate memory in osd_schedule_callback\n");
 149                 return -1;
 150         }
 151
 152         cb->callback = func;
 153         cb->data = data;
 154         INIT_WORK(&cb->work, osd_callback_work);
 155         return queue_work(wq, &cb->work);
 156 }
 157