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/timer.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/delay.h>
  40 #include <linux/time.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/bitops.h>
  44 #include <asm/kmap_types.h>
  45 #include <asm/atomic.h>
  46
  47 #include "include/osd.h"
  48
  49
  50 /* Data types */
  51
  52
  53 struct osd_callback_struct {
  54         struct work_struct work;
  55         void (*callback)(void *);
  56         void *data;
  57 };
  58
  59 void* VirtualAllocExec(unsigned int size)
  60 {
  61 #ifdef __x86_64__
  62         return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL_EXEC);
  63 #else
  64         return __vmalloc(size, GFP_KERNEL, __pgprot(__PAGE_KERNEL & (~_PAGE_NX)));
  65 #endif
  66 }
  67
  68 void* PageAlloc(unsigned int count)
  69 {
  70         void *p;
  71         p = (void *)__get_free_pages(GFP_KERNEL, get_order(count * PAGE_SIZE));
  72         if (p) memset(p, 0, count * PAGE_SIZE);
  73         return p;
  74
  75         /* struct page* page = alloc_page(GFP_KERNEL|__GFP_ZERO); */
  76         /* void *p; */
  77
  78         /* BUGBUG: We need to use kmap in case we are in HIMEM region */
  79         /* p = page_address(page); */
  80         /* if (p) memset(p, 0, PAGE_SIZE); */
  81         /* return p; */
  82 }
  83
  84 void PageFree(void* page, unsigned int count)
  85 {
  86         free_pages((unsigned long)page, get_order(count * PAGE_SIZE));
  87         /*struct page* p = virt_to_page(page);
  88         __free_page(p);*/
  89 }
  90
  91 void *MemMapIO(unsigned long phys, unsigned long size)
  92 {
  93         return (void*)GetVirtualAddress(phys); /* return ioremap_nocache(phys, size); */
  94 }
  95
  96 void MemUnmapIO(void *virt)
  97 {
  98         /* iounmap(virt); */
  99 }
 100
 101 static void TimerCallback(unsigned long data)
 102 {
 103         struct osd_timer *t = (struct osd_timer *) data;
 104
 105         t->callback(t->context);
 106 }
 107
 108 struct osd_timer *TimerCreate(PFN_TIMER_CALLBACK pfnTimerCB, void* context)
 109 {
 110         struct osd_timer *t = kmalloc(sizeof(struct osd_timer), GFP_KERNEL);
 111         if (!t)
 112         {
 113                 return NULL;
 114         }
 115
 116         t->callback = pfnTimerCB;
 117         t->context = context;
 118
 119         init_timer(&t->timer);
 120         t->timer.data = (unsigned long)t;
 121         t->timer.function = TimerCallback;
 122
 123         return t;
 124 }
 125
 126 void TimerStart(struct osd_timer *t, u32 expirationInUs)
 127 {
 128         t->timer.expires = jiffies + usecs_to_jiffies(expirationInUs);
 129         add_timer(&t->timer);
 130 }
 131
 132 int TimerStop(struct osd_timer *t)
 133 {
 134         return del_timer(&t->timer);
 135 }
 136
 137 void TimerClose(struct osd_timer *t)
 138 {
 139         del_timer(&t->timer);
 140         kfree(t);
 141 }
 142
 143 struct osd_waitevent *WaitEventCreate(void)
 144 {
 145         struct osd_waitevent *wait = kmalloc(sizeof(struct osd_waitevent), GFP_KERNEL);
 146         if (!wait)
 147         {
 148                 return NULL;
 149         }
 150
 151         wait->condition = 0;
 152         init_waitqueue_head(&wait->event);
 153         return wait;
 154 }
 155
 156 void WaitEventSet(struct osd_waitevent *waitEvent)
 157 {
 158         waitEvent->condition = 1;
 159         wake_up_interruptible(&waitEvent->event);
 160 }
 161
 162 int WaitEventWait(struct osd_waitevent *waitEvent)
 163 {
 164         int ret=0;
 165
 166         ret = wait_event_interruptible(waitEvent->event,
 167                                        waitEvent->condition);
 168         waitEvent->condition = 0;
 169         return ret;
 170 }
 171
 172 int WaitEventWaitEx(struct osd_waitevent *waitEvent, u32 TimeoutInMs)
 173 {
 174         int ret=0;
 175
 176         ret = wait_event_interruptible_timeout(waitEvent->event,
 177                                                waitEvent->condition,
 178                                                msecs_to_jiffies(TimeoutInMs));
 179         waitEvent->condition = 0;
 180         return ret;
 181 }
 182
 183 void* Physical2LogicalAddr(unsigned long PhysAddr)
 184 {
 185         void* logicalAddr = phys_to_virt(PhysAddr);
 186         BUG_ON(!virt_addr_valid(logicalAddr));
 187         return logicalAddr;
 188 }
 189
 190 unsigned long Logical2PhysicalAddr(void * LogicalAddr)
 191 {
 192         BUG_ON(!virt_addr_valid(LogicalAddr));
 193         return virt_to_phys(LogicalAddr);
 194 }
 195
 196
 197 unsigned long Virtual2Physical(void * VirtAddr)
 198 {
 199         unsigned long pfn = vmalloc_to_pfn(VirtAddr);
 200
 201         return pfn << PAGE_SHIFT;
 202 }
 203
 204 static void osd_callback_work(struct work_struct *work)
 205 {
 206         struct osd_callback_struct *cb = container_of(work,
 207                                                       struct osd_callback_struct,
 208                                                       work);
 209         (cb->callback)(cb->data);
 210
 211         kfree(cb);
 212 }
 213
 214 int osd_schedule_callback(struct workqueue_struct *wq,
 215                           void (*func)(void *),
 216                           void *data)
 217 {
 218         struct osd_callback_struct *cb;
 219
 220         cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 221         if (!cb)
 222         {
 223                 printk(KERN_ERR "unable to allocate memory in osd_schedule_callback");
 224                 return -1;
 225         }
 226
 227         cb->callback = func;
 228         cb->data = data;
 229         INIT_WORK(&cb->work, osd_callback_work);
 230         return queue_work(wq, &cb->work);
 231 }
 232