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
  92 void* PageMapVirtualAddress(unsigned long Pfn)
  93 {
  94         return kmap_atomic(pfn_to_page(Pfn), KM_IRQ0);
  95 }
  96
  97 void PageUnmapVirtualAddress(void* VirtAddr)
  98 {
  99         kunmap_atomic(VirtAddr, KM_IRQ0);
 100 }
 101
 102 void *MemMapIO(unsigned long phys, unsigned long size)
 103 {
 104         return (void*)GetVirtualAddress(phys); /* return ioremap_nocache(phys, size); */
 105 }
 106
 107 void MemUnmapIO(void *virt)
 108 {
 109         /* iounmap(virt); */
 110 }
 111
 112 static void TimerCallback(unsigned long data)
 113 {
 114         struct osd_timer *t = (struct osd_timer *) data;
 115
 116         t->callback(t->context);
 117 }
 118
 119 struct osd_timer *TimerCreate(PFN_TIMER_CALLBACK pfnTimerCB, void* context)
 120 {
 121         struct osd_timer *t = kmalloc(sizeof(struct osd_timer), GFP_KERNEL);
 122         if (!t)
 123         {
 124                 return NULL;
 125         }
 126
 127         t->callback = pfnTimerCB;
 128         t->context = context;
 129
 130         init_timer(&t->timer);
 131         t->timer.data = (unsigned long)t;
 132         t->timer.function = TimerCallback;
 133
 134         return t;
 135 }
 136
 137 void TimerStart(struct osd_timer *t, u32 expirationInUs)
 138 {
 139         t->timer.expires = jiffies + usecs_to_jiffies(expirationInUs);
 140         add_timer(&t->timer);
 141 }
 142
 143 int TimerStop(struct osd_timer *t)
 144 {
 145         return del_timer(&t->timer);
 146 }
 147
 148 void TimerClose(struct osd_timer *t)
 149 {
 150         del_timer(&t->timer);
 151         kfree(t);
 152 }
 153
 154 struct osd_waitevent *WaitEventCreate(void)
 155 {
 156         struct osd_waitevent *wait = kmalloc(sizeof(struct osd_waitevent), GFP_KERNEL);
 157         if (!wait)
 158         {
 159                 return NULL;
 160         }
 161
 162         wait->condition = 0;
 163         init_waitqueue_head(&wait->event);
 164         return wait;
 165 }
 166
 167 void WaitEventSet(struct osd_waitevent *waitEvent)
 168 {
 169         waitEvent->condition = 1;
 170         wake_up_interruptible(&waitEvent->event);
 171 }
 172
 173 int WaitEventWait(struct osd_waitevent *waitEvent)
 174 {
 175         int ret=0;
 176
 177         ret = wait_event_interruptible(waitEvent->event,
 178                                        waitEvent->condition);
 179         waitEvent->condition = 0;
 180         return ret;
 181 }
 182
 183 int WaitEventWaitEx(struct osd_waitevent *waitEvent, u32 TimeoutInMs)
 184 {
 185         int ret=0;
 186
 187         ret = wait_event_interruptible_timeout(waitEvent->event,
 188                                                waitEvent->condition,
 189                                                msecs_to_jiffies(TimeoutInMs));
 190         waitEvent->condition = 0;
 191         return ret;
 192 }
 193
 194 void* Physical2LogicalAddr(unsigned long PhysAddr)
 195 {
 196         void* logicalAddr = phys_to_virt(PhysAddr);
 197         BUG_ON(!virt_addr_valid(logicalAddr));
 198         return logicalAddr;
 199 }
 200
 201 unsigned long Logical2PhysicalAddr(void * LogicalAddr)
 202 {
 203         BUG_ON(!virt_addr_valid(LogicalAddr));
 204         return virt_to_phys(LogicalAddr);
 205 }
 206
 207
 208 unsigned long Virtual2Physical(void * VirtAddr)
 209 {
 210         unsigned long pfn = vmalloc_to_pfn(VirtAddr);
 211
 212         return pfn << PAGE_SHIFT;
 213 }
 214
 215 static void osd_callback_work(struct work_struct *work)
 216 {
 217         struct osd_callback_struct *cb = container_of(work,
 218                                                       struct osd_callback_struct,
 219                                                       work);
 220         (cb->callback)(cb->data);
 221
 222         kfree(cb);
 223 }
 224
 225 int osd_schedule_callback(struct workqueue_struct *wq,
 226                           void (*func)(void *),
 227                           void *data)
 228 {
 229         struct osd_callback_struct *cb;
 230
 231         cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 232         if (!cb)
 233         {
 234                 printk(KERN_ERR "unable to allocate memory in osd_schedule_callback");
 235                 return -1;
 236         }
 237
 238         cb->callback = func;
 239         cb->data = data;
 240         INIT_WORK(&cb->work, osd_callback_work);
 241         return queue_work(wq, &cb->work);
 242 }
 243