1 | /* |
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2 | * remote_barrier.c - POSIX barrier implementation. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017,2018,2019) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <hal_kernel_types.h> |
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25 | #include <hal_macros.h> |
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26 | #include <hal_remote.h> |
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27 | #include <hal_irqmask.h> |
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28 | #include <remote_busylock.h> |
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29 | #include <thread.h> |
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30 | #include <kmem.h> |
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31 | #include <printk.h> |
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32 | #include <process.h> |
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33 | #include <vmm.h> |
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34 | #include <remote_barrier.h> |
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35 | |
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36 | //////////////////////////////////////////////////// |
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37 | // generic (implementation independant) functions |
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38 | //////////////////////////////////////////////////// |
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39 | |
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40 | /////////////////////////////////////////////////// |
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41 | xptr_t generic_barrier_from_ident( intptr_t ident ) |
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42 | { |
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43 | // get pointer on local process_descriptor |
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44 | process_t * process = CURRENT_THREAD->process; |
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45 | |
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46 | // get pointers on reference process |
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47 | xptr_t ref_xp = process->ref_xp; |
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48 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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49 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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50 | |
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51 | // get extended pointer on root of barriers list |
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52 | xptr_t root_xp = XPTR( ref_cxy , &ref_ptr->barrier_root ); |
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53 | |
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54 | // scan reference process barriers list |
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55 | xptr_t iter_xp; |
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56 | xptr_t barrier_xp; |
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57 | cxy_t barrier_cxy; |
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58 | generic_barrier_t * barrier_ptr; |
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59 | intptr_t current; |
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60 | bool_t found = false; |
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61 | |
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62 | XLIST_FOREACH( root_xp , iter_xp ) |
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63 | { |
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64 | barrier_xp = XLIST_ELEMENT( iter_xp , generic_barrier_t , list ); |
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65 | barrier_cxy = GET_CXY( barrier_xp ); |
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66 | barrier_ptr = (generic_barrier_t *)GET_PTR( barrier_xp ); |
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67 | current = (intptr_t)hal_remote_lpt( XPTR( barrier_cxy , &barrier_ptr->ident ) ); |
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68 | if( ident == current ) |
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69 | { |
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70 | found = true; |
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71 | break; |
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72 | } |
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73 | } |
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74 | |
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75 | if( found == false ) return XPTR_NULL; |
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76 | else return barrier_xp; |
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77 | |
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78 | } // end generic_barrier_from_ident() |
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79 | |
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80 | ////////////////////////////////////////////////////////////// |
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81 | error_t generic_barrier_create( intptr_t ident, |
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82 | uint32_t count, |
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83 | pthread_barrierattr_t * attr ) |
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84 | { |
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85 | generic_barrier_t * gen_barrier_ptr; // local pointer on generic barrier descriptor |
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86 | void * barrier; // local pointer on implementation barrier descriptor |
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87 | kmem_req_t req; // kmem request |
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88 | |
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89 | // get pointer on local process_descriptor |
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90 | process_t * process = CURRENT_THREAD->process; |
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91 | |
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92 | // get pointers on reference process |
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93 | xptr_t ref_xp = process->ref_xp; |
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94 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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95 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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96 | |
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97 | // allocate memory for generic barrier descriptor |
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98 | req.type = KMEM_KCM; |
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99 | req.order = bits_log2( sizeof(generic_barrier_t) ); |
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100 | req.flags = AF_ZERO | AF_KERNEL; |
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101 | gen_barrier_ptr = kmem_remote_alloc( ref_cxy , &req ); |
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102 | |
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103 | if( gen_barrier_ptr == NULL ) |
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104 | { |
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105 | printk("\n[ERROR] in %s : cannot create generic barrier\n", __FUNCTION__ ); |
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106 | return -1; |
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107 | } |
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108 | |
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109 | // create implementation specific barrier descriptor |
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110 | if( attr == NULL ) // simple barrier implementation |
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111 | { |
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112 | // create simple barrier descriptor |
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113 | barrier = simple_barrier_create( count ); |
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114 | |
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115 | if( barrier == NULL ) return -1; |
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116 | } |
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117 | else // QDT barrier implementation |
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118 | { |
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119 | uint32_t x_size = attr->x_size; |
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120 | uint32_t y_size = attr->y_size; |
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121 | uint32_t nthreads = attr->nthreads; |
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122 | |
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123 | // check attributes / count |
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124 | if( (x_size * y_size * nthreads) != count ) |
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125 | { |
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126 | printk("\n[ERROR] in %s : count(%d) != x_size(%d) * y_size(%d) * nthreads(%d)\n", |
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127 | __FUNCTION__, count, x_size, y_size, nthreads ); |
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128 | return -1; |
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129 | } |
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130 | |
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131 | // create DQT barrier descriptor |
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132 | barrier = dqt_barrier_create( x_size , y_size , nthreads ); |
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133 | |
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134 | if( barrier == NULL ) return -1; |
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135 | } |
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136 | |
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137 | // initialize the generic barrier descriptor |
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138 | hal_remote_spt( XPTR( ref_cxy , &gen_barrier_ptr->ident ) , (void*)ident ); |
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139 | hal_remote_s32( XPTR( ref_cxy , &gen_barrier_ptr->is_dqt ) , (attr != NULL) ); |
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140 | hal_remote_spt( XPTR( ref_cxy , &gen_barrier_ptr->extend ) , barrier ); |
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141 | |
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142 | // build extended pointers on lock, root and entry for reference process xlist |
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143 | xptr_t root_xp = XPTR( ref_cxy , &ref_ptr->barrier_root ); |
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144 | xptr_t lock_xp = XPTR( ref_cxy , &ref_ptr->sync_lock ); |
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145 | xptr_t entry_xp = XPTR( ref_cxy , &gen_barrier_ptr->list ); |
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146 | |
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147 | // register barrier in reference process xlist of barriers |
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148 | remote_busylock_acquire( lock_xp ); |
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149 | xlist_add_first( root_xp , entry_xp ); |
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150 | remote_busylock_release( lock_xp ); |
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151 | |
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152 | return 0; |
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153 | |
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154 | } // en generic_barrier_create() |
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155 | |
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156 | ///////////////////////////////////////////////////// |
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157 | void generic_barrier_destroy( xptr_t gen_barrier_xp ) |
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158 | { |
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159 | kmem_req_t req; // kmem request |
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160 | |
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161 | // get pointer on local process_descriptor |
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162 | process_t * process = CURRENT_THREAD->process; |
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163 | |
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164 | // get pointers on reference process |
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165 | xptr_t ref_xp = process->ref_xp; |
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166 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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167 | process_t * ref_ptr = GET_PTR( ref_xp ); |
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168 | |
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169 | // get cluster and local pointer on generic barrier descriptor |
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170 | generic_barrier_t * gen_barrier_ptr = GET_PTR( gen_barrier_xp ); |
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171 | cxy_t gen_barrier_cxy = GET_CXY( gen_barrier_xp ); |
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172 | |
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173 | // get barrier type and extension pointer |
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174 | bool_t is_dqt = hal_remote_l32( XPTR( gen_barrier_cxy , &gen_barrier_ptr->is_dqt ) ); |
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175 | void * extend = hal_remote_lpt( XPTR( gen_barrier_cxy , &gen_barrier_ptr->extend ) ); |
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176 | |
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177 | // build extended pointer on implementation dependant barrier descriptor |
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178 | xptr_t barrier_xp = XPTR( gen_barrier_cxy , extend ); |
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179 | |
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180 | // delete the implementation specific barrier |
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181 | if( is_dqt ) dqt_barrier_destroy( barrier_xp ); |
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182 | else simple_barrier_destroy( barrier_xp ); |
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183 | |
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184 | // build extended pointers on lock and entry for reference process xlist |
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185 | xptr_t lock_xp = XPTR( ref_cxy , &ref_ptr->sync_lock ); |
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186 | xptr_t entry_xp = XPTR( gen_barrier_cxy , &gen_barrier_ptr->list ); |
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187 | |
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188 | // remove barrier from reference process xlist |
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189 | remote_busylock_acquire( lock_xp ); |
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190 | xlist_unlink( entry_xp ); |
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191 | remote_busylock_release( lock_xp ); |
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192 | |
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193 | // release memory allocated to barrier descriptor |
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194 | req.type = KMEM_KCM; |
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195 | req.ptr = gen_barrier_ptr; |
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196 | kmem_remote_free( ref_cxy , &req ); |
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197 | |
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198 | } // end generic_barrier_destroy() |
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199 | |
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200 | ////////////////////////////////////////////////// |
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201 | void generic_barrier_wait( xptr_t gen_barrier_xp ) |
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202 | { |
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203 | // get generic barrier descriptor cluster and pointer |
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204 | cxy_t gen_barrier_cxy = GET_CXY( gen_barrier_xp ); |
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205 | generic_barrier_t * gen_barrier_ptr = GET_PTR( gen_barrier_xp ); |
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206 | |
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207 | // get implementation type and extend local pointer |
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208 | bool_t is_dqt = hal_remote_l32( XPTR( gen_barrier_cxy , &gen_barrier_ptr->is_dqt ) ); |
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209 | void * extend = hal_remote_lpt( XPTR( gen_barrier_cxy , &gen_barrier_ptr->extend ) ); |
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210 | |
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211 | // build extended pointer on implementation specific barrier descriptor |
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212 | xptr_t barrier_xp = XPTR( gen_barrier_cxy , extend ); |
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213 | |
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214 | // call the relevant wait function |
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215 | if( is_dqt ) dqt_barrier_wait( barrier_xp ); |
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216 | else simple_barrier_wait( barrier_xp ); |
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217 | |
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218 | } // end generic_barrier_wait() |
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219 | |
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220 | ///////////////////////////////////////////////////// |
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221 | void generic_barrier_display( xptr_t gen_barrier_xp ) |
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222 | { |
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223 | // get cluster and local pointer |
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224 | generic_barrier_t * gen_barrier_ptr = GET_PTR( gen_barrier_xp ); |
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225 | cxy_t gen_barrier_cxy = GET_CXY( gen_barrier_xp ); |
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226 | |
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227 | // get barrier type and extend pointer |
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228 | bool_t is_dqt = hal_remote_l32( XPTR( gen_barrier_cxy , &gen_barrier_ptr->is_dqt ) ); |
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229 | void * extend = hal_remote_lpt( XPTR( gen_barrier_cxy , &gen_barrier_ptr->extend ) ); |
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230 | |
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231 | // buil extended pointer on the implementation specific barrier descriptor |
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232 | xptr_t barrier_xp = XPTR( gen_barrier_cxy , extend ); |
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233 | |
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234 | // display barrier state |
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235 | if( is_dqt ) dqt_barrier_display( barrier_xp ); |
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236 | else simple_barrier_display( barrier_xp ); |
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237 | } |
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238 | |
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239 | |
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240 | |
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241 | ///////////////////////////////////////////////////////////// |
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242 | // simple barrier functions |
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243 | ///////////////////////////////////////////////////////////// |
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244 | |
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245 | /////////////////////////////////////////////////////////// |
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246 | simple_barrier_t * simple_barrier_create( uint32_t count ) |
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247 | { |
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248 | kmem_req_t req; |
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249 | simple_barrier_t * barrier; |
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250 | |
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251 | // get pointer on local client process descriptor |
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252 | thread_t * this = CURRENT_THREAD; |
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253 | process_t * process = this->process; |
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254 | |
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255 | // get reference process cluster |
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256 | xptr_t ref_xp = process->ref_xp; |
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257 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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258 | |
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259 | // allocate memory for simple barrier descriptor |
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260 | req.type = KMEM_KCM; |
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261 | req.order = bits_log2( sizeof(simple_barrier_t) ); |
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262 | req.flags = AF_ZERO | AF_KERNEL; |
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263 | barrier = kmem_remote_alloc( ref_cxy , &req ); |
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264 | |
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265 | if( barrier == NULL ) |
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266 | { |
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267 | printk("\n[ERROR] in %s : cannot create simple barrier\n", __FUNCTION__ ); |
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268 | return NULL; |
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269 | } |
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270 | |
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271 | // initialise simple barrier descriptor |
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272 | hal_remote_s32 ( XPTR( ref_cxy , &barrier->arity ) , count ); |
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273 | hal_remote_s32 ( XPTR( ref_cxy , &barrier->current ) , 0 ); |
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274 | hal_remote_s32 ( XPTR( ref_cxy , &barrier->sense ) , 0 ); |
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275 | |
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276 | xlist_root_init ( XPTR( ref_cxy , &barrier->root ) ); |
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277 | remote_busylock_init( XPTR( ref_cxy , &barrier->lock ) , LOCK_BARRIER_STATE ); |
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278 | |
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279 | #if DEBUG_BARRIER_CREATE |
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280 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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281 | if( cycle > DEBUG_BARRIER_CREATE ) |
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282 | printk("\n[%s] thread[%x,%x] created barrier (%x,%x) / count %d / cycle %d\n", |
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283 | __FUNCTION__, process->pid, this->trdid, ref_cxy, barrier, count, cycle ); |
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284 | #endif |
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285 | |
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286 | return barrier; |
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287 | |
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288 | } // end simple_barrier_create() |
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289 | |
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290 | //////////////////////////////////////////////// |
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291 | void simple_barrier_destroy( xptr_t barrier_xp ) |
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292 | { |
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293 | kmem_req_t req; |
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294 | |
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295 | // get barrier cluster and local pointer |
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296 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
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297 | simple_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
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298 | |
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299 | // release memory allocated for barrier descriptor |
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300 | req.type = KMEM_KCM; |
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301 | req.ptr = barrier_ptr; |
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302 | kmem_remote_free( barrier_cxy , &req ); |
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303 | |
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304 | #if DEBUG_BARRIER_DESTROY |
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305 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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306 | thread_t * this = CURRENT_THREAD; |
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307 | process_t * process = this->process; |
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308 | if( cycle > DEBUG_BARRIER_DESTROY ) |
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309 | printk("\n[%s] thread[%x,%x] deleted barrier (%x,%x) / cycle %d\n", |
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310 | __FUNCTION__, process->pid, this->trdid, barrier_ptr, barrier_cxy, cycle ); |
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311 | #endif |
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312 | |
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313 | } // end simple_barrier_destroy() |
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314 | |
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315 | ///////////////////////////////////////////// |
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316 | void simple_barrier_wait( xptr_t barrier_xp ) |
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317 | { |
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318 | uint32_t expected; |
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319 | uint32_t sense; |
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320 | uint32_t current; |
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321 | uint32_t arity; |
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322 | xptr_t root_xp; |
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323 | xptr_t lock_xp; |
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324 | xptr_t current_xp; |
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325 | xptr_t sense_xp; |
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326 | xptr_t arity_xp; |
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327 | |
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328 | // get pointer on calling thread |
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329 | thread_t * this = CURRENT_THREAD; |
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330 | |
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331 | // check calling thread can yield |
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332 | thread_assert_can_yield( this , __FUNCTION__ ); |
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333 | |
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334 | // get cluster and local pointer on remote barrier |
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335 | simple_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
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336 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
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337 | |
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338 | #if DEBUG_BARRIER_WAIT |
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339 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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340 | if( cycle > DEBUG_BARRIER_WAIT ) |
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341 | printk("\n[%s] thread[%x,%x] enter / barrier (%x,%x) / cycle %d\n", |
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342 | __FUNCTION__, this->process->pid, this->trdid, barrier_cxy, barrier_ptr, cycle ); |
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343 | #endif |
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344 | |
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345 | // build extended pointers on various barrier descriptor fields |
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346 | lock_xp = XPTR( barrier_cxy , &barrier_ptr->lock ); |
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347 | root_xp = XPTR( barrier_cxy , &barrier_ptr->root ); |
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348 | current_xp = XPTR( barrier_cxy , &barrier_ptr->current ); |
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349 | sense_xp = XPTR( barrier_cxy , &barrier_ptr->sense ); |
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350 | arity_xp = XPTR( barrier_cxy , &barrier_ptr->arity ); |
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351 | |
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352 | // take busylock protecting the barrier state |
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353 | remote_busylock_acquire( lock_xp ); |
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354 | |
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355 | // get sense and threads values from barrier descriptor |
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356 | sense = hal_remote_l32( sense_xp ); |
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357 | arity = hal_remote_l32( arity_xp ); |
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358 | |
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359 | // compute expected value |
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360 | if ( sense == 0 ) expected = 1; |
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361 | else expected = 0; |
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362 | |
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363 | // increment current number of arrived threads / get value before increment |
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364 | current = hal_remote_atomic_add( current_xp , 1 ); |
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365 | |
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366 | // last thread reset current, toggle sense, and activate all waiting threads |
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367 | // other threads block, register in queue, and deschedule |
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368 | |
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369 | if( current == (arity - 1) ) // last thread |
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370 | { |
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371 | hal_remote_s32( current_xp , 0 ); |
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372 | hal_remote_s32( sense_xp , expected ); |
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373 | |
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374 | // unblock all waiting threads |
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375 | while( xlist_is_empty( root_xp ) == false ) |
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376 | { |
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377 | // get pointers on first waiting thread |
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378 | xptr_t thread_xp = XLIST_FIRST( root_xp , thread_t , wait_list ); |
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379 | cxy_t thread_cxy = GET_CXY( thread_xp ); |
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380 | thread_t * thread_ptr = GET_PTR( thread_xp ); |
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381 | |
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382 | #if (DEBUG_BARRIER_WAIT & 1) |
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383 | trdid_t trdid = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) ); |
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384 | process_t * process = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) ); |
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385 | pid_t pid = hal_remote_l32( XPTR( thread_cxy , &process->pid ) ); |
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386 | if( cycle > DEBUG_BARRIER_WAIT ) |
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387 | printk("\n[%s] thread[%x,%x] unblocks thread[%x,%x]\n", |
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388 | __FUNCTION__, this->process->pid, this->trdid, pid, trdid ); |
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389 | #endif |
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390 | |
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391 | // remove waiting thread from queue |
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392 | xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_list ) ); |
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393 | |
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394 | // unblock waiting thread |
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395 | thread_unblock( thread_xp , THREAD_BLOCKED_USERSYNC ); |
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396 | } |
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397 | |
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398 | // release busylock protecting the barrier |
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399 | remote_busylock_release( lock_xp ); |
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400 | } |
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401 | else // not the last thread |
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402 | { |
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403 | |
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404 | #if (DEBUG_BARRIER_WAIT & 1) |
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405 | if( cycle > DEBUG_BARRIER_WAIT ) |
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406 | printk("\n[%s] thread[%x,%x] blocks\n", |
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407 | __FUNCTION__, this->process->pid, this->trdid ); |
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408 | #endif |
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409 | |
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410 | // register calling thread in barrier waiting queue |
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411 | xlist_add_last( root_xp , XPTR( local_cxy , &this->wait_list ) ); |
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412 | |
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413 | // block calling thread |
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414 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_USERSYNC ); |
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415 | |
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416 | // release busylock protecting the remote_barrier |
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417 | remote_busylock_release( lock_xp ); |
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418 | |
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419 | // deschedule |
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420 | sched_yield("blocked on barrier"); |
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421 | } |
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422 | |
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423 | #if DEBUG_BARRIER_WAIT |
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424 | cycle = (uint32_t)hal_get_cycles(); |
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425 | if( cycle > DEBUG_BARRIER_WAIT ) |
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426 | printk("\n[%s] thread[%x,%x] exit / barrier (%x,%x) / cycle %d\n", |
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427 | __FUNCTION__, this->process->pid, this->trdid, barrier_cxy, barrier_ptr, cycle ); |
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428 | #endif |
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429 | |
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430 | } // end simple_barrier_wait() |
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431 | |
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432 | ///////////////////////////////////////////////// |
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433 | void simple_barrier_display( xptr_t barrier_xp ) |
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434 | { |
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435 | // get cluster and local pointer on simple barrier |
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436 | simple_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
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437 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
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438 | |
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439 | // get barrier global parameters |
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440 | uint32_t current = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->current ) ); |
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441 | uint32_t arity = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->arity ) ); |
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442 | |
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443 | printk("\n***** simple barrier : %d arrived threads on %d *****\n", |
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444 | current, arity ); |
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445 | |
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446 | } // end simple_barrier_display() |
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447 | |
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448 | |
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449 | |
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450 | |
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451 | ///////////////////////////////////////////////////////////// |
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452 | // DQT barrier functions |
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453 | ///////////////////////////////////////////////////////////// |
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454 | |
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455 | static void dqt_barrier_increment( xptr_t node_xp ); |
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456 | |
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457 | #if DEBUG_BARRIER_CREATE |
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458 | void dqt_barrier_display( xptr_t barrier_xp ); |
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459 | #endif |
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460 | |
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461 | /////////////////////////////////////////////////////// |
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462 | dqt_barrier_t * dqt_barrier_create( uint32_t x_size, |
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463 | uint32_t y_size, |
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464 | uint32_t nthreads ) |
---|
465 | { |
---|
466 | dqt_barrier_t * barrier; // local pointer on DQT barrier descriptor |
---|
467 | xptr_t barrier_xp; // extended pointer on DQT barrier descriptor |
---|
468 | uint32_t z; // actual DQT size == max(x_size,y_size) |
---|
469 | uint32_t levels; // actual number of DQT levels |
---|
470 | uint32_t x; // X coordinate in QDT mesh |
---|
471 | uint32_t y; // Y coordinate in QDT mesh |
---|
472 | uint32_t l; // level coordinate |
---|
473 | kmem_req_t req; // kmem request |
---|
474 | |
---|
475 | // compute number of DQT levels, depending on the mesh size |
---|
476 | z = (x_size > y_size) ? x_size : y_size; |
---|
477 | levels = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 3 : (z < 9) ? 4 : 5; |
---|
478 | |
---|
479 | // check x_size and y_size arguments |
---|
480 | assert( __FUNCTION__, (z <= 16) , "DQT mesh size larger than (16*16)\n"); |
---|
481 | |
---|
482 | // check size of an array of 5 DQT nodes |
---|
483 | assert( __FUNCTION__, (sizeof(dqt_node_t) * 5 <= 512 ), "array of DQT nodes larger than 512 bytes\n"); |
---|
484 | |
---|
485 | // check size of DQT barrier descriptor |
---|
486 | assert( __FUNCTION__, (sizeof(dqt_barrier_t) <= 0x4000 ), "DQT barrier descriptor larger than 4 pages\n"); |
---|
487 | |
---|
488 | // get pointer on client thread and process descriptors |
---|
489 | thread_t * this = CURRENT_THREAD; |
---|
490 | process_t * process = this->process; |
---|
491 | |
---|
492 | #if DEBUG_BARRIER_CREATE |
---|
493 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
494 | if( cycle > DEBUG_BARRIER_CREATE ) |
---|
495 | printk("\n[%s] thread[%x,%x] enter : x_size %d / y_size %d / levels %d / cycle %d\n", |
---|
496 | __FUNCTION__, process->pid, this->trdid, x_size, y_size, levels, cycle ); |
---|
497 | #endif |
---|
498 | |
---|
499 | // get reference process cluster |
---|
500 | xptr_t ref_xp = process->ref_xp; |
---|
501 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
---|
502 | |
---|
503 | // 1. allocate 4 small pages for the DQT barrier descriptor in reference cluster |
---|
504 | req.type = KMEM_PPM; |
---|
505 | req.order = 2; // 4 small pages == 16 Kbytes |
---|
506 | req.flags = AF_ZERO | AF_KERNEL; |
---|
507 | barrier = kmem_remote_alloc( ref_cxy , &req ); |
---|
508 | |
---|
509 | if( barrier == NULL ) |
---|
510 | { |
---|
511 | printk("\n[ERROR] in %s : cannot create DQT barrier\n", __FUNCTION__ ); |
---|
512 | return NULL; |
---|
513 | } |
---|
514 | |
---|
515 | // get pointers on DQT barrier descriptor in reference cluster |
---|
516 | barrier_xp = XPTR( ref_cxy , barrier ); |
---|
517 | |
---|
518 | // initialize global parameters in DQT barrier descriptor |
---|
519 | hal_remote_s32( XPTR( ref_cxy , &barrier->x_size ) , x_size ); |
---|
520 | hal_remote_s32( XPTR( ref_cxy , &barrier->y_size ) , x_size ); |
---|
521 | hal_remote_s32( XPTR( ref_cxy , &barrier->nthreads ) , nthreads ); |
---|
522 | |
---|
523 | #if DEBUG_BARRIER_CREATE |
---|
524 | if( cycle > DEBUG_BARRIER_CREATE ) |
---|
525 | printk("\n[%s] thread[%x,%x] created DQT barrier descriptor(%x,%x)\n", |
---|
526 | __FUNCTION__, process->pid, this->trdid, ref_cxy, barrier ); |
---|
527 | #endif |
---|
528 | |
---|
529 | // 2. allocate memory for an array of 5 DQT nodes |
---|
530 | // in all existing clusters covered by the DQDT |
---|
531 | // (5 nodes per cluster <= 512 bytes per cluster) |
---|
532 | // and complete barrier descriptor initialisation. |
---|
533 | for ( x = 0 ; x < x_size ; x++ ) |
---|
534 | { |
---|
535 | for ( y = 0 ; y < y_size ; y++ ) |
---|
536 | { |
---|
537 | cxy_t cxy = HAL_CXY_FROM_XY( x , y ); // target cluster identifier |
---|
538 | xptr_t local_array_xp; // xptr of nodes array in cluster cxy |
---|
539 | |
---|
540 | // allocate memory in existing clusters only |
---|
541 | if( LOCAL_CLUSTER->cluster_info[x][y] ) |
---|
542 | { |
---|
543 | req.type = KMEM_KCM; |
---|
544 | req.order = 9; // 512 bytes |
---|
545 | req.flags = AF_ZERO | AF_KERNEL; |
---|
546 | |
---|
547 | void * ptr = kmem_remote_alloc( cxy , &req ); |
---|
548 | |
---|
549 | if( ptr == NULL ) |
---|
550 | { |
---|
551 | printk("\n[ERROR] in %s : cannot allocate DQT in cluster %x\n", |
---|
552 | __FUNCTION__, cxy ); |
---|
553 | return NULL; |
---|
554 | } |
---|
555 | |
---|
556 | // build extended pointer on local node array in cluster cxy |
---|
557 | local_array_xp = XPTR( cxy , ptr ); |
---|
558 | |
---|
559 | // initialize the node_xp[x][y][l] array in barrier descriptor |
---|
560 | for ( l = 0 ; l < levels ; l++ ) |
---|
561 | { |
---|
562 | xptr_t node_xp = local_array_xp + ( l * sizeof(dqt_node_t) ); |
---|
563 | hal_remote_s64( XPTR( ref_cxy , &barrier->node_xp[x][y][l] ), node_xp ); |
---|
564 | |
---|
565 | #if (DEBUG_BARRIER_CREATE & 1) |
---|
566 | if( cycle > DEBUG_BARRIER_CREATE ) |
---|
567 | printk(" - dqt_node_xp[%d,%d,%d] = (%x,%x) / &dqt_node_xp = %x\n", |
---|
568 | x , y , l , GET_CXY( node_xp ), GET_PTR( node_xp ), &barrier->node_xp[x][y][l] ); |
---|
569 | #endif |
---|
570 | } |
---|
571 | } |
---|
572 | else // register XPTR_NULL for all non-existing entries |
---|
573 | { |
---|
574 | for ( l = 0 ; l < levels ; l++ ) |
---|
575 | { |
---|
576 | hal_remote_s64( XPTR( ref_cxy , &barrier->node_xp[x][y][l] ), XPTR_NULL ); |
---|
577 | } |
---|
578 | } |
---|
579 | } // end for y |
---|
580 | } // end for x |
---|
581 | |
---|
582 | #if DEBUG_BARRIER_CREATE |
---|
583 | if( cycle > DEBUG_BARRIER_CREATE ) |
---|
584 | printk("\n[%s] thread[%x,%x] initialized array of pointers in DQT barrier\n", |
---|
585 | __FUNCTION__, process->pid, this->trdid ); |
---|
586 | #endif |
---|
587 | |
---|
588 | // 3. initialise all distributed DQT nodes using remote accesses |
---|
589 | // and the pointers stored in the node_xp[x][y][l] array |
---|
590 | for ( x = 0 ; x < x_size ; x++ ) |
---|
591 | { |
---|
592 | for ( y = 0 ; y < y_size ; y++ ) |
---|
593 | { |
---|
594 | // initialize existing clusters only |
---|
595 | if( LOCAL_CLUSTER->cluster_info[x][y] ) |
---|
596 | { |
---|
597 | for ( l = 0 ; l < levels ; l++ ) |
---|
598 | { |
---|
599 | xptr_t parent_xp; |
---|
600 | xptr_t child_xp[4]; |
---|
601 | uint32_t arity = 0; |
---|
602 | |
---|
603 | // get DQT node pointers |
---|
604 | xptr_t node_xp = hal_remote_l64( XPTR( ref_cxy, |
---|
605 | &barrier->node_xp[x][y][l] ) ); |
---|
606 | cxy_t node_cxy = GET_CXY( node_xp ); |
---|
607 | dqt_node_t * node_ptr = GET_PTR( node_xp ); |
---|
608 | |
---|
609 | // compute arity and child_xp[i] |
---|
610 | if (l == 0 ) // bottom DQT node |
---|
611 | { |
---|
612 | arity = nthreads; |
---|
613 | |
---|
614 | child_xp[0] = XPTR_NULL; |
---|
615 | child_xp[1] = XPTR_NULL; |
---|
616 | child_xp[2] = XPTR_NULL; |
---|
617 | child_xp[3] = XPTR_NULL; |
---|
618 | } |
---|
619 | else // not a bottom DQT node |
---|
620 | { |
---|
621 | arity = 0; |
---|
622 | |
---|
623 | // only few non-bottom nodes must be initialised |
---|
624 | if( ((x & ((1<<l)-1)) == 0) && ((y & ((1<<l)-1)) == 0) ) |
---|
625 | { |
---|
626 | uint32_t cx[4]; // x coordinate for children |
---|
627 | uint32_t cy[4]; // y coordinate for children |
---|
628 | uint32_t i; |
---|
629 | |
---|
630 | // the child0 coordinates are equal to the parent coordinates |
---|
631 | // other children coordinates depend on the level value |
---|
632 | cx[0] = x; |
---|
633 | cy[0] = y; |
---|
634 | |
---|
635 | cx[1] = x; |
---|
636 | cy[1] = y + (1 << (l-1)); |
---|
637 | |
---|
638 | cx[2] = x + (1 << (l-1)); |
---|
639 | cy[2] = y; |
---|
640 | |
---|
641 | cx[3] = x + (1 << (l-1)); |
---|
642 | cy[3] = y + (1 << (l-1)); |
---|
643 | |
---|
644 | for ( i = 0 ; i < 4 ; i++ ) |
---|
645 | { |
---|
646 | // child pointer is NULL if outside the mesh |
---|
647 | if ( (cx[i] < x_size) && (cy[i] < y_size) ) |
---|
648 | { |
---|
649 | // get child_xp[i] |
---|
650 | child_xp[i] = hal_remote_l64( XPTR( ref_cxy, |
---|
651 | &barrier->node_xp[cx[i]][cy[i]][l-1] ) ); |
---|
652 | |
---|
653 | // increment arity |
---|
654 | arity++; |
---|
655 | } |
---|
656 | else |
---|
657 | { |
---|
658 | child_xp[i] = XPTR_NULL; |
---|
659 | } |
---|
660 | } |
---|
661 | } |
---|
662 | } |
---|
663 | |
---|
664 | // compute parent_xp |
---|
665 | if( l == (levels - 1) ) // root DQT node |
---|
666 | { |
---|
667 | parent_xp = XPTR_NULL; |
---|
668 | } |
---|
669 | else // not the root |
---|
670 | { |
---|
671 | uint32_t px = 0; // parent X coordinate |
---|
672 | uint32_t py = 0; // parent Y coordinate |
---|
673 | bool_t found = false; |
---|
674 | |
---|
675 | // compute macro_cluster x_min, x_max, y_min, y_max |
---|
676 | uint32_t x_min = x & ~((1<<(l+1))-1); |
---|
677 | uint32_t x_max = x_min + (1<<(l+1)); |
---|
678 | uint32_t y_min = y & ~((1<<(l+1))-1); |
---|
679 | uint32_t y_max = y_min + (1<<(l+1)); |
---|
680 | |
---|
681 | // scan all clusters in macro-cluster[x][y][l] / take first active |
---|
682 | for( px = x_min ; px < x_max ; px++ ) |
---|
683 | { |
---|
684 | for( py = y_min ; py < y_max ; py++ ) |
---|
685 | { |
---|
686 | if( LOCAL_CLUSTER->cluster_info[px][py] ) found = true; |
---|
687 | if( found ) break; |
---|
688 | } |
---|
689 | if( found ) break; |
---|
690 | } |
---|
691 | |
---|
692 | parent_xp = hal_remote_l64( XPTR( ref_cxy , |
---|
693 | &barrier->node_xp[px][py][l+1] ) ); |
---|
694 | } |
---|
695 | |
---|
696 | // initializes the DQT node |
---|
697 | hal_remote_s32( XPTR( node_cxy , &node_ptr->arity ) , arity ); |
---|
698 | hal_remote_s32( XPTR( node_cxy , &node_ptr->current ) , 0 ); |
---|
699 | hal_remote_s32( XPTR( node_cxy , &node_ptr->sense ) , 0 ); |
---|
700 | hal_remote_s32( XPTR( node_cxy , &node_ptr->level ) , l ); |
---|
701 | hal_remote_s64( XPTR( node_cxy , &node_ptr->parent_xp ) , parent_xp ); |
---|
702 | hal_remote_s64( XPTR( node_cxy , &node_ptr->child_xp[0] ) , child_xp[0] ); |
---|
703 | hal_remote_s64( XPTR( node_cxy , &node_ptr->child_xp[1] ) , child_xp[1] ); |
---|
704 | hal_remote_s64( XPTR( node_cxy , &node_ptr->child_xp[2] ) , child_xp[2] ); |
---|
705 | hal_remote_s64( XPTR( node_cxy , &node_ptr->child_xp[3] ) , child_xp[3] ); |
---|
706 | |
---|
707 | xlist_root_init( XPTR( node_cxy , &node_ptr->root ) ); |
---|
708 | |
---|
709 | remote_busylock_init( XPTR( node_cxy , &node_ptr->lock ), |
---|
710 | LOCK_BARRIER_STATE ); |
---|
711 | } |
---|
712 | } |
---|
713 | } |
---|
714 | } |
---|
715 | |
---|
716 | #if DEBUG_BARRIER_CREATE |
---|
717 | cycle = (uint32_t)hal_get_cycles(); |
---|
718 | if( cycle > DEBUG_BARRIER_CREATE ) |
---|
719 | printk("\n[%s] thread[%x,%x] completed DQT barrier initialisation / cycle %d\n", |
---|
720 | __FUNCTION__, process->pid, this->trdid, cycle ); |
---|
721 | dqt_barrier_display( barrier_xp ); |
---|
722 | #endif |
---|
723 | |
---|
724 | return barrier; |
---|
725 | |
---|
726 | } // end dqt_barrier_create() |
---|
727 | |
---|
728 | /////////////////////////////////////////////// |
---|
729 | void dqt_barrier_destroy( xptr_t barrier_xp ) |
---|
730 | { |
---|
731 | kmem_req_t req; // kmem request |
---|
732 | uint32_t x; |
---|
733 | uint32_t y; |
---|
734 | |
---|
735 | |
---|
736 | // get DQT barrier descriptor cluster and local pointer |
---|
737 | dqt_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
---|
738 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
---|
739 | |
---|
740 | #if DEBUG_BARRIER_DESTROY |
---|
741 | thread_t * this = CURRENT_THREAD; |
---|
742 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
743 | if( cycle > DEBUG_BARRIER_DESTROY ) |
---|
744 | printk("\n[%s] thread[%x,%x] enter for barrier (%x,%x) / cycle %d\n", |
---|
745 | __FUNCTION__, this->process->pid, this->trdid, barrier_cxy, barrier_ptr, cycle ); |
---|
746 | #endif |
---|
747 | |
---|
748 | // get x_size and y_size global parameters |
---|
749 | uint32_t x_size = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->x_size ) ); |
---|
750 | uint32_t y_size = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->y_size ) ); |
---|
751 | |
---|
752 | // 1. release memory allocated for the DQT nodes |
---|
753 | // in all clusters covered by the QDT mesh |
---|
754 | for ( x = 0 ; x < x_size ; x++ ) |
---|
755 | { |
---|
756 | for ( y = 0 ; y < y_size ; y++ ) |
---|
757 | { |
---|
758 | // compute target cluster identifier |
---|
759 | cxy_t cxy = HAL_CXY_FROM_XY( x , y ); |
---|
760 | |
---|
761 | // existing cluster only |
---|
762 | if( LOCAL_CLUSTER->cluster_info[x][y] ) |
---|
763 | { |
---|
764 | // get local pointer on dqt_nodes array in target cluster |
---|
765 | xptr_t buf_xp_xp = XPTR( barrier_cxy , &barrier_ptr->node_xp[x][y][0] ); |
---|
766 | xptr_t buf_xp = hal_remote_l64( buf_xp_xp ); |
---|
767 | void * buf = GET_PTR( buf_xp ); |
---|
768 | |
---|
769 | assert( __FUNCTION__, (cxy == GET_CXY(buf_xp)) , "bad extended pointer on dqt_nodes array\n" ); |
---|
770 | |
---|
771 | req.type = KMEM_KCM; |
---|
772 | req.ptr = buf; |
---|
773 | kmem_remote_free( cxy , &req ); |
---|
774 | |
---|
775 | #if DEBUG_BARRIER_DESTROY |
---|
776 | thread_t * this = CURRENT_THREAD; |
---|
777 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
778 | if( cycle > DEBUG_BARRIER_DESTROY ) |
---|
779 | printk("\n[%s] thread[%x,%x] released node array %x in cluster %x / cycle %d\n", |
---|
780 | __FUNCTION__, this->process->pid, this->trdid, buf, cxy, cycle ); |
---|
781 | #endif |
---|
782 | } |
---|
783 | } |
---|
784 | } |
---|
785 | |
---|
786 | // 2. release memory allocated for barrier descriptor in ref cluster |
---|
787 | req.type = KMEM_PPM; |
---|
788 | req.ptr = barrier_ptr; |
---|
789 | kmem_remote_free( barrier_cxy , &req ); |
---|
790 | |
---|
791 | #if DEBUG_BARRIER_DESTROY |
---|
792 | cycle = (uint32_t)hal_get_cycles(); |
---|
793 | if( cycle > DEBUG_BARRIER_DESTROY ) |
---|
794 | printk("\n[%s] thread[%x,%x] release barrier descriptor (%x,%x) / cycle %d\n", |
---|
795 | __FUNCTION__, this->process->pid, this->trdid, barrier_cxy, barrier_ptr, cycle ); |
---|
796 | #endif |
---|
797 | |
---|
798 | } // end dqt_barrier_destroy() |
---|
799 | |
---|
800 | //////////////////////////////////////////// |
---|
801 | void dqt_barrier_wait( xptr_t barrier_xp ) |
---|
802 | { |
---|
803 | thread_t * this = CURRENT_THREAD; |
---|
804 | |
---|
805 | // check calling thread can yield |
---|
806 | thread_assert_can_yield( this , __FUNCTION__ ); |
---|
807 | |
---|
808 | // get cluster and local pointer on DQT barrier descriptor |
---|
809 | dqt_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
---|
810 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
---|
811 | |
---|
812 | #if DEBUG_BARRIER_WAIT |
---|
813 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
814 | if( cycle > DEBUG_BARRIER_WAIT ) |
---|
815 | printk("\n[%s] thread[%x,%x] enter / barrier (%x,%x) / cycle %d\n", |
---|
816 | __FUNCTION__, this->process->pid, this->trdid, barrier_cxy, barrier_ptr, cycle ); |
---|
817 | #endif |
---|
818 | |
---|
819 | // get extended pointer on local bottom DQT node |
---|
820 | uint32_t x = HAL_X_FROM_CXY( local_cxy ); |
---|
821 | uint32_t y = HAL_Y_FROM_CXY( local_cxy ); |
---|
822 | xptr_t node_xp = hal_remote_l64( XPTR( barrier_cxy , &barrier_ptr->node_xp[x][y][0] ) ); |
---|
823 | |
---|
824 | // call recursive function to traverse DQT from bottom to root |
---|
825 | dqt_barrier_increment( node_xp ); |
---|
826 | |
---|
827 | #if DEBUG_BARRIER_WAIT |
---|
828 | cycle = (uint32_t)hal_get_cycles(); |
---|
829 | if( cycle > DEBUG_BARRIER_WAIT ) |
---|
830 | printk("\n[%s] thread[%x,%x] exit / barrier (%x,%x) / cycle %d\n", |
---|
831 | __FUNCTION__, this->trdid, this->process->pid, barrier_cxy, barrier_ptr, cycle ); |
---|
832 | #endif |
---|
833 | |
---|
834 | } // end dqt_barrier_wait() |
---|
835 | |
---|
836 | ////////////////////////////////////////////// |
---|
837 | void dqt_barrier_display( xptr_t barrier_xp ) |
---|
838 | { |
---|
839 | // get cluster and local pointer on DQT barrier |
---|
840 | dqt_barrier_t * barrier_ptr = GET_PTR( barrier_xp ); |
---|
841 | cxy_t barrier_cxy = GET_CXY( barrier_xp ); |
---|
842 | |
---|
843 | // get barrier global parameters |
---|
844 | uint32_t x_size = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->x_size ) ); |
---|
845 | uint32_t y_size = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->y_size ) ); |
---|
846 | uint32_t nthreads = hal_remote_l32( XPTR( barrier_cxy , &barrier_ptr->nthreads ) ); |
---|
847 | |
---|
848 | // compute size and number of DQT levels |
---|
849 | uint32_t z = (x_size > y_size) ? x_size : y_size; |
---|
850 | uint32_t levels = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 3 : (z < 9) ? 4 : 5; |
---|
851 | |
---|
852 | printk("\n***** DQT barrier : x_size %d / y_size %d / nthreads %d / levels %d *****\n", |
---|
853 | x_size, y_size, nthreads, levels ); |
---|
854 | |
---|
855 | uint32_t x , y , l; |
---|
856 | |
---|
857 | for ( x = 0 ; x < x_size ; x++ ) |
---|
858 | { |
---|
859 | for ( y = 0 ; y < y_size ; y++ ) |
---|
860 | { |
---|
861 | printk(" - cluster[%d,%d]\n", x , y ); |
---|
862 | |
---|
863 | for ( l = 0 ; l < levels ; l++ ) |
---|
864 | { |
---|
865 | // get pointers on target node |
---|
866 | xptr_t node_xp = hal_remote_l64( XPTR( barrier_cxy , |
---|
867 | &barrier_ptr->node_xp[x][y][l] ) ); |
---|
868 | dqt_node_t * node_ptr = GET_PTR( node_xp ); |
---|
869 | cxy_t node_cxy = GET_CXY( node_xp ); |
---|
870 | |
---|
871 | if( node_xp != XPTR_NULL ) |
---|
872 | { |
---|
873 | uint32_t level = hal_remote_l32( XPTR( node_cxy , &node_ptr->level )); |
---|
874 | xptr_t pa_xp = hal_remote_l32( XPTR( node_cxy , &node_ptr->parent_xp )); |
---|
875 | xptr_t c0_xp = hal_remote_l32( XPTR( node_cxy , &node_ptr->child_xp[0] )); |
---|
876 | xptr_t c1_xp = hal_remote_l32( XPTR( node_cxy , &node_ptr->child_xp[1] )); |
---|
877 | xptr_t c2_xp = hal_remote_l32( XPTR( node_cxy , &node_ptr->child_xp[2] )); |
---|
878 | xptr_t c3_xp = hal_remote_l32( XPTR( node_cxy , &node_ptr->child_xp[3] )); |
---|
879 | |
---|
880 | printk(" . level %d : (%x,%x) / P(%x,%x) / C0(%x,%x)" |
---|
881 | " C1(%x,%x) / C2(%x,%x) / C3(%x,%x)\n", |
---|
882 | level, node_cxy, node_ptr, |
---|
883 | GET_CXY(pa_xp), GET_PTR(pa_xp), |
---|
884 | GET_CXY(c0_xp), GET_PTR(c0_xp), |
---|
885 | GET_CXY(c1_xp), GET_PTR(c1_xp), |
---|
886 | GET_CXY(c2_xp), GET_PTR(c2_xp), |
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887 | GET_CXY(c3_xp), GET_PTR(c3_xp) ); |
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888 | } |
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889 | } |
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890 | } |
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891 | } |
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892 | } // end dqt_barrier_display() |
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893 | |
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894 | |
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895 | ////////////////////////////////////////////////////////////////////////////////////////// |
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896 | // This static (recursive) function is called by the dqt_barrier_wait() function. |
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897 | // It traverses the DQT from bottom to root, and decrements the "current" variables. |
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898 | // For each traversed node, it blocks and deschedules if it is not the last expected |
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899 | // thread. The last arrived thread reset the local node before returning. |
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900 | ////////////////////////////////////////////////////////////////////////////////////////// |
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901 | static void dqt_barrier_increment( xptr_t node_xp ) |
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902 | { |
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903 | uint32_t expected; |
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904 | uint32_t sense; |
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905 | uint32_t arity; |
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906 | |
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907 | thread_t * this = CURRENT_THREAD; |
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908 | |
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909 | // get node cluster and local pointer |
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910 | dqt_node_t * node_ptr = GET_PTR( node_xp ); |
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911 | cxy_t node_cxy = GET_CXY( node_xp ); |
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912 | |
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913 | // build relevant extended pointers |
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914 | xptr_t arity_xp = XPTR( node_cxy , &node_ptr->arity ); |
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915 | xptr_t sense_xp = XPTR( node_cxy , &node_ptr->sense ); |
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916 | xptr_t current_xp = XPTR( node_cxy , &node_ptr->current ); |
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917 | xptr_t lock_xp = XPTR( node_cxy , &node_ptr->lock ); |
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918 | xptr_t root_xp = XPTR( node_cxy , &node_ptr->root ); |
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919 | |
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920 | #if DEBUG_BARRIER_WAIT |
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921 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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922 | uint32_t level = hal_remote_l32( XPTR( node_cxy, &node_ptr->level ) ); |
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923 | if( cycle > DEBUG_BARRIER_WAIT ) |
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924 | printk("\n[%s] thread[%x,%x] increments DQT node(%d,%d,%d) / cycle %d\n", |
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925 | __FUNCTION__ , this->process->pid, this->trdid, |
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926 | HAL_X_FROM_CXY(node_cxy), HAL_Y_FROM_CXY(node_cxy), level ); |
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927 | #endif |
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928 | |
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929 | // get extended pointer on parent node |
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930 | xptr_t parent_xp = hal_remote_l64( XPTR( node_cxy , &node_ptr->parent_xp ) ); |
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931 | |
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932 | // take busylock |
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933 | remote_busylock_acquire( lock_xp ); |
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934 | |
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935 | // get sense and arity values from barrier descriptor |
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936 | sense = hal_remote_l32( sense_xp ); |
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937 | arity = hal_remote_l32( arity_xp ); |
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938 | |
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939 | // compute expected value |
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940 | expected = (sense == 0) ? 1 : 0; |
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941 | |
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942 | // increment current number of arrived threads / get value before increment |
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943 | uint32_t current = hal_remote_atomic_add( current_xp , 1 ); |
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944 | |
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945 | // last arrived thread reset the local node, makes the recursive call |
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946 | // on parent node, and reactivates all waiting thread when returning. |
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947 | // other threads block, register in queue, and deschedule. |
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948 | |
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949 | if ( current == (arity - 1) ) // last thread |
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950 | { |
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951 | |
---|
952 | #if DEBUG_BARRIER_WAIT |
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953 | if( cycle > DEBUG_BARRIER_WAIT ) |
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954 | printk("\n[%s] thread[%x,%x] reset DQT node(%d,%d,%d)\n", |
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955 | __FUNCTION__ , this->process->pid, this->trdid, |
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956 | HAL_X_FROM_CXY(node_cxy), HAL_Y_FROM_CXY(node_cxy), level ); |
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957 | #endif |
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958 | // reset the current node |
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959 | hal_remote_s32( sense_xp , expected ); |
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960 | hal_remote_s32( current_xp , 0 ); |
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961 | |
---|
962 | // release busylock protecting the current node |
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963 | remote_busylock_release( lock_xp ); |
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964 | |
---|
965 | // recursive call on parent node when current node is not the root |
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966 | if( parent_xp != XPTR_NULL) dqt_barrier_increment( parent_xp ); |
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967 | |
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968 | // unblock all waiting threads on this node |
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969 | while( xlist_is_empty( root_xp ) == false ) |
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970 | { |
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971 | // get pointers on first waiting thread |
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972 | xptr_t thread_xp = XLIST_FIRST( root_xp , thread_t , wait_list ); |
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973 | cxy_t thread_cxy = GET_CXY( thread_xp ); |
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974 | thread_t * thread_ptr = GET_PTR( thread_xp ); |
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975 | |
---|
976 | #if (DEBUG_BARRIER_WAIT & 1) |
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977 | trdid_t trdid = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) ); |
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978 | process_t * process = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) ); |
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979 | pid_t pid = hal_remote_l32( XPTR( thread_cxy , &process->pid ) ); |
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980 | if( cycle > DEBUG_BARRIER_WAIT ) |
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981 | printk("\n[%s] thread[%x,%x] unblock thread[%x,%x]\n", |
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982 | __FUNCTION__, this->process->pid, this->trdid, pid, trdid ); |
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983 | #endif |
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984 | // remove waiting thread from queue |
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985 | xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_list ) ); |
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986 | |
---|
987 | // unblock waiting thread |
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988 | thread_unblock( thread_xp , THREAD_BLOCKED_USERSYNC ); |
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989 | } |
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990 | } |
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991 | else // not the last thread |
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992 | { |
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993 | // get extended pointer on xlist entry from thread |
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994 | xptr_t entry_xp = XPTR( local_cxy , &this->wait_list ); |
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995 | |
---|
996 | // register calling thread in barrier waiting queue |
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997 | xlist_add_last( root_xp , entry_xp ); |
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998 | |
---|
999 | // block calling thread |
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1000 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_USERSYNC ); |
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1001 | |
---|
1002 | // release busylock protecting the remote_barrier |
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1003 | remote_busylock_release( lock_xp ); |
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1004 | |
---|
1005 | #if DEBUG_BARRIER_WAIT |
---|
1006 | if( cycle > DEBUG_BARRIER_WAIT ) |
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1007 | printk("\n[%s] thread[%x,%x] blocks on node(%d,%d,%d)\n", |
---|
1008 | __FUNCTION__ , this->process->pid, this->trdid, |
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1009 | HAL_X_FROM_CXY(node_cxy), HAL_Y_FROM_CXY(node_cxy), level ); |
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1010 | #endif |
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1011 | // deschedule |
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1012 | sched_yield("blocked on barrier"); |
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1013 | } |
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1014 | |
---|
1015 | return; |
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1016 | |
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1017 | } // end dqt_barrier_decrement() |
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1018 | |
---|
1019 | |
---|