palacios/src/interfaces/vmm_pstate_ctrl.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2014, the V3VEE Project <http://www.v3vee.org>
  11  * all rights reserved.
  12  *
  13  * Author: Kyle C. Hale <kh@u.northwestern.edu>
  14  *         Shiva Rao <shiva.rao.717@gmail.com>
  15  *         Peter Dinda <pdinda@northwestern.edu>
  16  *
  17  * This is free software.  you are permitted to use,
  18  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  19  */
  20
  21 #include <palacios/vmm.h>
  22
  23 #include <interfaces/vmm_pstate_ctrl.h>
  24
  25 static struct v3_host_pstate_ctrl_iface *pstate_ctrl_hooks = 0;
  26
  27
  28 void V3_Init_Pstate_Ctrl(struct v3_host_pstate_ctrl_iface *hooks)
  29 {
  30     pstate_ctrl_hooks = hooks;
  31
  32     PrintDebug(VM_NONE, VCORE_NONE, "V3 host p-state control interface inited\n");
  33
  34     return;
  35 }
  36
  37
  38 void v3_get_cpu_pstate_chars(struct v3_cpu_pstate_chars *chars)
  39 {
  40     if (pstate_ctrl_hooks && pstate_ctrl_hooks->get_chars) {
  41         pstate_ctrl_hooks->get_chars(chars);
  42     }
  43 }
  44
  45
  46 void v3_acquire_pstate_ctrl(uint32_t type)
  47 {
  48     if (pstate_ctrl_hooks && pstate_ctrl_hooks->acquire) {
  49         pstate_ctrl_hooks->acquire(type);
  50     }
  51 }
  52
  53
  54 uint8_t v3_get_cpu_pstate(void)
  55 {
  56     if (pstate_ctrl_hooks && pstate_ctrl_hooks->get_pstate) {
  57         return pstate_ctrl_hooks->get_pstate();
  58     } else {
  59         return 0;
  60     }
  61 }
  62
  63 void    v3_set_cpu_pstate (uint8_t p)
  64 {
  65     if (pstate_ctrl_hooks && pstate_ctrl_hooks->set_pstate) {
  66         pstate_ctrl_hooks->set_pstate(p);
  67     }
  68 }
  69
  70 uint64_t v3_get_cpu_freq(void)
  71 {
  72     if (pstate_ctrl_hooks && pstate_ctrl_hooks->get_freq) {
  73         return pstate_ctrl_hooks->get_freq();
  74     } else {
  75         return 0;
  76     }
  77 }
  78
  79 void    v3_set_cpu_freq(uint64_t f)
  80 {
  81     if (pstate_ctrl_hooks && pstate_ctrl_hooks->set_freq) {
  82         pstate_ctrl_hooks->set_freq(f);
  83     }
  84 }
  85
  86 // If using direct control, relinquish
  87 void v3_release_pstate_control()
  88 {
  89     if (pstate_ctrl_hooks && pstate_ctrl_hooks->release) {
  90         pstate_ctrl_hooks->release();
  91     }
  92 }