1 | |
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2 | #include "stdio.h" |
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3 | #include "malloc.h" |
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4 | #include "giet_config.h" |
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5 | #include "user_lock.h" |
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6 | #include "user_sqt_lock.h" |
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7 | |
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8 | static |
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9 | void sqt_lock_build( sqt_lock_t* lock, // pointer on the SQT lock |
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10 | unsigned int x, // node X coordinate |
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11 | unsigned int y, // node Y coordinate |
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12 | unsigned int level, // node level |
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13 | sqt_lock_node_t* parent, // pointer on parent node |
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14 | unsigned int xmax, // SQT X size |
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15 | unsigned int ymax ) // SQT Y size |
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16 | { |
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17 | |
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18 | #if GIET_DEBUG_USER_LOCK |
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19 | |
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20 | unsigned int px; |
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21 | unsigned int py; |
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22 | unsigned int pl; |
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23 | giet_proc_xyp( &px, &py, &pl ); |
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24 | #endif |
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25 | |
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26 | // get target node pointer |
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27 | sqt_lock_node_t* node = lock->node[x][y][level]; |
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28 | |
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29 | if (level == 0 ) // terminal case |
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30 | { |
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31 | // initializes target node |
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32 | node->current = 0; |
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33 | node->free = 0; |
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34 | node->level = 0; |
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35 | node->parent = parent; |
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36 | node->child[0] = NULL; |
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37 | node->child[1] = NULL; |
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38 | node->child[2] = NULL; |
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39 | node->child[3] = NULL; |
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40 | |
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41 | #if GIET_DEBUG_USER_LOCK |
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42 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] P[%d,%d,%d] initialises SQT node[%d,%d,%d] : \n" |
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43 | " parent = %x / childO = %x / child1 = %x / child2 = %x / child3 = %x\n", |
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44 | px , py , pl , x , y , level , |
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45 | (unsigned int)node->parent , |
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46 | (unsigned int)node->child[0] , |
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47 | (unsigned int)node->child[1] , |
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48 | (unsigned int)node->child[2] , |
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49 | (unsigned int)node->child[3] ); |
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50 | #endif |
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51 | |
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52 | } |
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53 | else // non terminal case |
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54 | { |
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55 | unsigned int cx[4]; // x coordinate for children |
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56 | unsigned int cy[4]; // y coordinate for children |
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57 | unsigned int i; // child index |
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58 | |
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59 | // the child0 coordinates are equal to the parent coordinates |
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60 | // other childs coordinates are incremented depending on the level value |
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61 | cx[0] = x; |
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62 | cy[0] = y; |
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63 | |
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64 | cx[1] = x + (1 << (level-1)); |
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65 | cy[1] = y; |
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66 | |
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67 | cx[2] = x; |
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68 | cy[2] = y + (1 << (level-1)); |
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69 | |
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70 | cx[3] = x + (1 << (level-1)); |
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71 | cy[3] = y + (1 << (level-1)); |
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72 | |
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73 | // initializes target node |
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74 | for ( i = 0 ; i < 4 ; i++ ) |
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75 | { |
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76 | if ( (cx[i] < xmax) && (cy[i] < ymax) ) |
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77 | node->child[i] = lock->node[cx[i]][cy[i]][level-1]; |
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78 | else |
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79 | node->child[i] = NULL; |
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80 | } |
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81 | node->current = 0; |
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82 | node->free = 0; |
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83 | node->level = level; |
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84 | node->parent = parent; |
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85 | |
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86 | #if GIET_DEBUG_USER_LOCK |
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87 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] P[%d,%d,%d] initialises SQT node[%d,%d,%d] : \n" |
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88 | " parent = %x / childO = %x / child1 = %x / child2 = %x / child3 = %x\n", |
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89 | px , py , pl , x , y , level , |
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90 | (unsigned int)node->parent , |
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91 | (unsigned int)node->child[0] , |
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92 | (unsigned int)node->child[1] , |
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93 | (unsigned int)node->child[2] , |
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94 | (unsigned int)node->child[3] ); |
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95 | #endif |
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96 | |
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97 | // recursive calls for children nodes |
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98 | for ( i = 0 ; i < 4 ; i++ ) |
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99 | { |
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100 | if ( (cx[i] < xmax) && (cy[i] < ymax) ) |
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101 | sqt_lock_build( lock, |
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102 | cx[i], |
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103 | cy[i], |
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104 | level-1, |
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105 | node, |
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106 | xmax, |
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107 | ymax ); |
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108 | } |
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109 | } |
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110 | } // end _sqt_lock_build() |
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111 | |
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112 | |
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113 | |
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114 | ///////////////////////////////////////////////////////////////////////////////// |
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115 | void sqt_lock_init( sqt_lock_t* lock, |
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116 | unsigned int x_size, // number of clusters in a row |
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117 | unsigned int y_size, // number of clusters in a col |
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118 | unsigned int ntasks ) // tasks per clusters |
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119 | { |
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120 | // check parameters |
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121 | if ( x_size > 16 ) giet_exit("SQT LOCK ERROR : x_size too large"); |
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122 | if ( y_size > 16 ) giet_exit("SQT LOCK ERROR : y_size too large"); |
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123 | if ( ntasks > 8 ) giet_exit("SQT LOCK ERROR : ntasks too large"); |
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124 | |
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125 | // compute SQT levels |
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126 | unsigned int levels; |
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127 | unsigned int z = (x_size > y_size) ? x_size : y_size; |
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128 | levels = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 3 : (z < 9) ? 4 : 5; |
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129 | |
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130 | #if GIET_DEBUG_USER_LOCK |
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131 | unsigned int px; |
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132 | unsigned int py; |
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133 | unsigned int pl; |
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134 | giet_proc_xyp(&px, &py, &pl); |
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135 | unsigned int side = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 4 : (z < 9) ? 8 : 16; |
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136 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] sqt_nodes allocation\n" |
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137 | " x_size = %d / y_size = %d / levels = %d / side = %d\n", |
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138 | x_size , y_size , levels , side ); |
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139 | #endif |
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140 | |
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141 | |
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142 | unsigned int x; // x coordinate for one SQT node |
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143 | unsigned int y; // y coordinate for one SQT node |
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144 | unsigned int l; // level for one SQT node |
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145 | |
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146 | for ( x = 0 ; x < x_size ; x++ ) |
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147 | { |
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148 | for ( y = 0 ; y < y_size ; y++ ) |
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149 | { |
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150 | for ( l = 0 ; l < levels ; l++ ) // level 0 nodes |
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151 | { |
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152 | |
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153 | if ( ( (l == 0) && ((x&0x00) == 0) && ((y&0x00) == 0) ) || |
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154 | ( (l == 1) && ((x&0x01) == 0) && ((y&0x01) == 0) ) || |
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155 | ( (l == 2) && ((x&0x03) == 0) && ((y&0x03) == 0) ) || |
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156 | ( (l == 3) && ((x&0x07) == 0) && ((y&0x07) == 0) ) || |
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157 | ( (l == 4) && ((x&0x0F) == 0) && ((y&0x0F) == 0) ) ) |
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158 | { |
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159 | lock->node[x][y][l] = |
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160 | (sqt_lock_node_t*)remote_malloc( sizeof(sqt_lock_node_t), |
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161 | x, y ); |
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162 | |
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163 | #if GIET_DEBUG_USER_LOCK |
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164 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] P[%d,%d,%d] allocates SQT node[%d,%d,%d]" |
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165 | " : vaddr = %x\n", |
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166 | px , py , pl , x , y , l , (unsigned int)lock->node[x][y][l] ); |
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167 | #endif |
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168 | } |
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169 | } |
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170 | } |
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171 | } |
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172 | |
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173 | // recursively initialize all SQT nodes from root to bottom |
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174 | sqt_lock_build( lock, |
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175 | 0, |
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176 | 0, |
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177 | levels-1, |
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178 | NULL, |
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179 | x_size, |
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180 | y_size ); |
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181 | |
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182 | asm volatile ("sync" ::: "memory"); |
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183 | |
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184 | #if GIET_DEBUG_USER_LOCK |
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185 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] SQT nodes initialisation completed\n"); |
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186 | #endif |
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187 | |
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188 | } // end sqt_lock_init() |
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189 | |
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190 | |
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191 | ////////////////////////////////////////////////////////////////////////////////// |
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192 | static |
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193 | void sqt_lock_take( sqt_lock_node_t* node ) |
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194 | { |
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195 | // get next free ticket from local lock |
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196 | unsigned int ticket = atomic_increment( &node->free, 1 ); |
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197 | |
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198 | #if GIET_DEBUG_USER_LOCK |
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199 | unsigned int x; |
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200 | unsigned int y; |
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201 | unsigned int l; |
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202 | giet_proc_xyp(&x, &y, &l); |
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203 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] P[%d,%d,%d] get ticket %d for SQT lock %x" |
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204 | " / level = %d / current = %d / free = %d\n", |
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205 | x , y , l , ticket , (unsigned int)node , |
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206 | node->level , node->current , node->free ); |
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207 | #endif |
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208 | |
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209 | // poll the local lock current index |
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210 | while ( (*(volatile unsigned int *)( &node->current )) != ticket ) asm volatile( "nop" ); |
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211 | |
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212 | #if GIET_DEBUG_USER_LOCK |
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213 | giet_shr_printf("\n[DEBUG SQT_LOCK] P[%d,%d,%d] get SQT lock %x" |
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214 | " / level = %d / current = %d / free = %d\n", |
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215 | x , y , l , (unsigned int)node , |
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216 | node->level , node->current , node->free ); |
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217 | #endif |
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218 | |
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219 | // try to take the parent node lock until top is reached |
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220 | if ( node->parent != NULL ) sqt_lock_take( node->parent ); |
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221 | |
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222 | } // end _sqt_lock_take() |
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223 | |
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224 | |
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225 | ///////////////////////////////////////////////////////////////////////////////// |
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226 | void sqt_lock_acquire( sqt_lock_t* lock ) |
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227 | { |
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228 | unsigned int x; |
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229 | unsigned int y; |
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230 | unsigned int p; |
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231 | // get cluster coordinates |
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232 | giet_proc_xyp( &x, &y, &p ); |
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233 | |
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234 | // try to recursively take the distributed locks (from bottom to top) |
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235 | sqt_lock_take( lock->node[x][y][0] ); |
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236 | } |
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237 | |
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238 | ///////////////////////////////////////////////////////////////////////////////// |
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239 | static |
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240 | void sqt_lock_give( sqt_lock_node_t* node ) |
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241 | { |
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242 | // release the local lock |
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243 | node->current = node->current + 1; |
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244 | |
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245 | #if GIET_DEBUG_USER_LOCK |
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246 | unsigned int x; |
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247 | unsigned int y; |
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248 | unsigned int l; |
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249 | giet_proc_xyp(&x, &y, &l); |
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250 | giet_shr_printf("\n[DEBUG USER SQT_LOCK] P[%d,%d,%d] release SQT lock %x" |
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251 | " / level = %d / current = %d / free = %d\n", |
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252 | x , y , l , (unsigned int)node, |
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253 | node->level , node->current , node->free ); |
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254 | #endif |
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255 | |
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256 | // reset parent node until top is reached |
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257 | if ( node->parent != NULL ) sqt_lock_give( node->parent ); |
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258 | |
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259 | } // end _sqt_lock_give() |
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260 | |
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261 | ///////////////////////////////////////////////////////////////////////////////// |
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262 | void sqt_lock_release( sqt_lock_t* lock ) |
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263 | { |
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264 | asm volatile ( "sync" ); // for consistency |
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265 | |
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266 | unsigned int x; |
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267 | unsigned int y; |
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268 | unsigned int p; |
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269 | // get cluster coordinates |
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270 | giet_proc_xyp( &x, &y, &p ); |
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271 | |
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272 | // recursively reset the distributed locks (from bottom to top) |
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273 | sqt_lock_give( lock->node[x][y][0] ); |
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274 | } |
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275 | |
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276 | // Local Variables: |
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277 | // tab-width: 4 |
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278 | // c-basic-offset: 4 |
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279 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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280 | // indent-tabs-mode: nil |
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281 | // End: |
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282 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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283 | |
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