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