1 | /* |
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2 | * vpt.c: Virtual Platform Timer |
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3 | * |
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4 | * Copyright (c) 2006, Xiaowei Yang, Intel Corporation. |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or modify it |
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7 | * under the terms and conditions of the GNU General Public License, |
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8 | * version 2, as published by the Free Software Foundation. |
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9 | * |
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10 | * This program is distributed in the hope it will be useful, but WITHOUT |
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11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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13 | * more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License along with |
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16 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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17 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
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18 | * |
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19 | */ |
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20 | #include <xen/time.h> |
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21 | #include <asm/hvm/support.h> |
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22 | #include <asm/hvm/vpt.h> |
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23 | #include <asm/event.h> |
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24 | |
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25 | static __inline__ void missed_ticks(struct periodic_time *pt) |
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26 | { |
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27 | s_time_t missed_ticks; |
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28 | |
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29 | missed_ticks = NOW() - pt->scheduled; |
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30 | if ( missed_ticks > 0 ) |
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31 | { |
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32 | missed_ticks = missed_ticks / (s_time_t) pt->period + 1; |
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33 | if ( missed_ticks > 1000 ) |
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34 | { |
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35 | /* TODO: Adjust guest time together */ |
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36 | pt->pending_intr_nr++; |
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37 | } |
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38 | else |
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39 | { |
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40 | pt->pending_intr_nr += missed_ticks; |
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41 | } |
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42 | pt->scheduled += missed_ticks * pt->period; |
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43 | } |
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44 | } |
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45 | |
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46 | void pt_freeze_time(struct vcpu *v) |
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47 | { |
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48 | struct list_head *head = &v->arch.hvm_vcpu.tm_list; |
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49 | struct list_head *list; |
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50 | struct periodic_time *pt; |
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51 | |
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52 | if ( test_bit(_VPF_blocked, &v->pause_flags) ) |
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53 | return; |
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54 | |
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55 | v->arch.hvm_vcpu.guest_time = hvm_get_guest_time(v); |
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56 | |
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57 | list_for_each( list, head ) |
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58 | { |
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59 | pt = list_entry(list, struct periodic_time, list); |
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60 | stop_timer(&pt->timer); |
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61 | } |
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62 | } |
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63 | |
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64 | void pt_thaw_time(struct vcpu *v) |
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65 | { |
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66 | struct list_head *head = &v->arch.hvm_vcpu.tm_list; |
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67 | struct list_head *list; |
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68 | struct periodic_time *pt; |
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69 | |
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70 | if ( v->arch.hvm_vcpu.guest_time ) |
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71 | { |
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72 | hvm_set_guest_time(v, v->arch.hvm_vcpu.guest_time); |
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73 | v->arch.hvm_vcpu.guest_time = 0; |
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74 | |
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75 | list_for_each( list, head ) |
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76 | { |
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77 | pt = list_entry(list, struct periodic_time, list); |
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78 | missed_ticks(pt); |
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79 | set_timer(&pt->timer, pt->scheduled); |
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80 | } |
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81 | } |
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82 | } |
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83 | |
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84 | /* Hook function for the platform periodic time */ |
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85 | void pt_timer_fn(void *data) |
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86 | { |
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87 | struct periodic_time *pt = data; |
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88 | |
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89 | pt->pending_intr_nr++; |
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90 | pt->scheduled += pt->period; |
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91 | |
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92 | missed_ticks(pt); |
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93 | |
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94 | if ( !pt->one_shot ) |
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95 | set_timer(&pt->timer, pt->scheduled); |
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96 | |
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97 | vcpu_kick(pt->vcpu); |
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98 | } |
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99 | |
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100 | void pt_update_irq(struct vcpu *v) |
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101 | { |
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102 | struct list_head *head = &v->arch.hvm_vcpu.tm_list; |
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103 | struct list_head *list; |
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104 | struct periodic_time *pt; |
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105 | uint64_t max_lag = -1ULL; |
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106 | int irq = -1; |
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107 | |
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108 | list_for_each( list, head ) |
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109 | { |
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110 | pt = list_entry(list, struct periodic_time, list); |
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111 | if ( !is_isa_irq_masked(v, pt->irq) && pt->pending_intr_nr && |
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112 | ((pt->last_plt_gtime + pt->period_cycles) < max_lag) ) |
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113 | { |
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114 | max_lag = pt->last_plt_gtime + pt->period_cycles; |
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115 | irq = pt->irq; |
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116 | } |
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117 | } |
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118 | |
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119 | if ( is_lvtt(v, irq) ) |
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120 | { |
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121 | vlapic_set_irq(vcpu_vlapic(v), irq, 0); |
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122 | } |
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123 | else if ( irq >= 0 ) |
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124 | { |
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125 | hvm_isa_irq_deassert(v->domain, irq); |
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126 | hvm_isa_irq_assert(v->domain, irq); |
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127 | } |
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128 | } |
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129 | |
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130 | struct periodic_time *is_pt_irq(struct vcpu *v, int vector, int type) |
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131 | { |
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132 | struct list_head *head = &v->arch.hvm_vcpu.tm_list; |
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133 | struct list_head *list; |
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134 | struct periodic_time *pt; |
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135 | struct RTCState *rtc = &v->domain->arch.hvm_domain.pl_time.vrtc; |
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136 | int vec; |
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137 | |
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138 | list_for_each( list, head ) |
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139 | { |
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140 | pt = list_entry(list, struct periodic_time, list); |
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141 | if ( !pt->pending_intr_nr ) |
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142 | continue; |
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143 | |
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144 | if ( is_lvtt(v, pt->irq) ) |
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145 | { |
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146 | if ( pt->irq != vector ) |
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147 | continue; |
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148 | return pt; |
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149 | } |
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150 | |
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151 | vec = get_isa_irq_vector(v, pt->irq, type); |
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152 | |
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153 | /* RTC irq need special care */ |
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154 | if ( (vector != vec) || (pt->irq == 8 && !is_rtc_periodic_irq(rtc)) ) |
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155 | continue; |
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156 | |
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157 | return pt; |
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158 | } |
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159 | |
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160 | return NULL; |
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161 | } |
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162 | |
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163 | void pt_intr_post(struct vcpu *v, int vector, int type) |
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164 | { |
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165 | struct periodic_time *pt = is_pt_irq(v, vector, type); |
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166 | |
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167 | if ( pt == NULL ) |
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168 | return; |
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169 | |
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170 | pt->pending_intr_nr--; |
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171 | pt->last_plt_gtime += pt->period_cycles; |
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172 | |
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173 | if ( hvm_get_guest_time(pt->vcpu) < pt->last_plt_gtime ) |
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174 | hvm_set_guest_time(pt->vcpu, pt->last_plt_gtime); |
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175 | |
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176 | if ( pt->cb != NULL ) |
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177 | pt->cb(pt->vcpu, pt->priv); |
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178 | } |
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179 | |
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180 | /* If pt is enabled, discard pending intr */ |
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181 | void pt_reset(struct vcpu *v) |
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182 | { |
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183 | struct list_head *head = &v->arch.hvm_vcpu.tm_list; |
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184 | struct list_head *list; |
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185 | struct periodic_time *pt; |
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186 | |
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187 | list_for_each( list, head ) |
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188 | { |
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189 | pt = list_entry(list, struct periodic_time, list); |
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190 | if ( pt->enabled ) |
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191 | { |
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192 | pt->pending_intr_nr = 0; |
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193 | pt->last_plt_gtime = hvm_get_guest_time(pt->vcpu); |
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194 | pt->scheduled = NOW() + pt->period; |
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195 | set_timer(&pt->timer, pt->scheduled); |
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196 | } |
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197 | } |
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198 | } |
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199 | |
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200 | void create_periodic_time(struct vcpu *v, struct periodic_time *pt, uint64_t period, |
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201 | uint8_t irq, char one_shot, time_cb *cb, void *data) |
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202 | { |
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203 | destroy_periodic_time(pt); |
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204 | |
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205 | pt->enabled = 1; |
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206 | if ( period < 900000 ) /* < 0.9 ms */ |
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207 | { |
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208 | gdprintk(XENLOG_WARNING, |
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209 | "HVM_PlatformTime: program too small period %"PRIu64"\n", |
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210 | period); |
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211 | period = 900000; /* force to 0.9ms */ |
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212 | } |
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213 | pt->period = period; |
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214 | pt->vcpu = v; |
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215 | pt->last_plt_gtime = hvm_get_guest_time(pt->vcpu); |
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216 | pt->irq = irq; |
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217 | pt->period_cycles = (u64)period * cpu_khz / 1000000L; |
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218 | pt->one_shot = one_shot; |
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219 | pt->scheduled = NOW() + period; |
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220 | pt->cb = cb; |
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221 | pt->priv = data; |
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222 | |
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223 | list_add(&pt->list, &v->arch.hvm_vcpu.tm_list); |
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224 | set_timer(&pt->timer, pt->scheduled); |
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225 | } |
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226 | |
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227 | void destroy_periodic_time(struct periodic_time *pt) |
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228 | { |
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229 | if ( pt->enabled ) |
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230 | { |
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231 | pt->enabled = 0; |
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232 | pt->pending_intr_nr = 0; |
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233 | list_del(&pt->list); |
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234 | stop_timer(&pt->timer); |
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235 | } |
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236 | } |
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