1 | /* |
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2 | * mapper.c - Map memory, file or device in process virtual address space. |
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3 | * |
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4 | * Authors Mohamed Lamine Karaoui (2015) |
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5 | * Alain Greiner (2016) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | #include <kernel_config.h> |
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26 | #include <hal_types.h> |
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27 | #include <hal_special.h> |
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28 | #include <hal_uspace.h> |
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29 | #include <grdxt.h> |
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30 | #include <rwlock.h> |
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31 | #include <printk.h> |
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32 | #include <memcpy.h> |
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33 | #include <thread.h> |
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34 | #include <core.h> |
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35 | #include <process.h> |
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36 | #include <kmem.h> |
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37 | #include <kcm.h> |
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38 | #include <page.h> |
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39 | #include <cluster.h> |
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40 | #include <vfs.h> |
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41 | #include <mapper.h> |
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42 | |
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43 | ////////////////////////////////////////////// |
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44 | mapper_t * mapper_create( vfs_fs_type_t type ) |
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45 | { |
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46 | mapper_t * mapper; |
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47 | kmem_req_t req; |
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48 | error_t error; |
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49 | |
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50 | // allocate memory for associated mapper |
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51 | req.type = KMEM_MAPPER; |
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52 | req.size = sizeof(mapper_t); |
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53 | req.flags = AF_KERNEL | AF_ZERO; |
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54 | mapper = (mapper_t *)kmem_alloc( &req ); |
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55 | |
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56 | if( mapper == NULL ) |
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57 | { |
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58 | printk("\n[ERROR] in %s : no memory for mapper descriptor\n", __FUNCTION__ ); |
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59 | return NULL; |
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60 | } |
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61 | |
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62 | // initialize refcount & inode |
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63 | mapper->refcount = 0; |
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64 | mapper->inode = NULL; |
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65 | |
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66 | // initialize radix tree |
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67 | error = grdxt_init( &mapper->radix, |
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68 | CONFIG_VMM_GRDXT_W1, |
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69 | CONFIG_VMM_GRDXT_W2, |
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70 | CONFIG_VMM_GRDXT_W3 ); |
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71 | |
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72 | if( error ) |
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73 | { |
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74 | printk("\n[ERROR] in %s : cannot initialize radix tree\n", __FUNCTION__ ); |
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75 | req.type = KMEM_MAPPER; |
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76 | req.ptr = mapper; |
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77 | kmem_free( &req ); |
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78 | return NULL; |
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79 | } |
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80 | |
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81 | // initialize mapper type |
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82 | mapper->type = type; |
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83 | |
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84 | // initialize mapper lock |
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85 | rwlock_init( &mapper->lock ); |
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86 | |
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87 | // initialize waiting threads xlist (empty) |
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88 | xlist_root_init( XPTR( local_cxy , &mapper->wait_root ) ); |
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89 | |
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90 | // initialize vsegs xlist (empty) |
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91 | xlist_root_init( XPTR( local_cxy , &mapper->vsegs_root ) ); |
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92 | |
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93 | return mapper; |
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94 | |
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95 | } // end mapper_create() |
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96 | |
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97 | /////////////////////////////////////////// |
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98 | error_t mapper_destroy( mapper_t * mapper ) |
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99 | { |
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100 | page_t * page; |
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101 | uint32_t found_index = 0; |
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102 | uint32_t start_index = 0; |
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103 | kmem_req_t req; |
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104 | error_t error; |
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105 | |
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106 | // scan radix three and release all registered pages to PPM |
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107 | do |
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108 | { |
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109 | // get page from radix tree |
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110 | page = (page_t *)grdxt_get_first( &mapper->radix , start_index , &found_index ); |
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111 | |
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112 | if( page != NULL ) |
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113 | { |
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114 | // remove page from mapper and release to PPM |
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115 | error = mapper_release_page( mapper , page ); |
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116 | |
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117 | if ( error ) return error; |
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118 | |
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119 | // update start_key value for next page |
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120 | start_index = found_index; |
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121 | } |
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122 | } |
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123 | while( page != NULL ); |
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124 | |
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125 | // release the memory allocated to radix-tree itself |
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126 | grdxt_destroy( &mapper->radix ); |
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127 | |
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128 | // release memory for mapper descriptor |
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129 | req.type = KMEM_MAPPER; |
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130 | req.ptr = mapper; |
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131 | kmem_free( &req ); |
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132 | |
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133 | return 0; |
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134 | |
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135 | } // end mapper_destroy() |
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136 | |
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137 | //////////////////////////////////////////// |
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138 | page_t * mapper_get_page( mapper_t * mapper, |
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139 | uint32_t index ) |
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140 | { |
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141 | kmem_req_t req; |
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142 | page_t * page; |
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143 | error_t error; |
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144 | |
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145 | mapper_dmsg("\n[DMSG] %s : enters for page %d / mapper %x\n", |
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146 | __FUNCTION__ , index , mapper ); |
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147 | |
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148 | thread_t * this = CURRENT_THREAD; |
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149 | |
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150 | // take mapper lock in READ_MODE |
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151 | rwlock_rd_lock( &mapper->lock ); |
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152 | |
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153 | // search page in radix tree |
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154 | page = (page_t *)grdxt_lookup( &mapper->radix , index ); |
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155 | |
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156 | // test if page available in mapper |
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157 | if( ( page == NULL) || page_is_flag( page , PG_INLOAD ) ) // page not available |
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158 | { |
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159 | |
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160 | // release the lock in READ_MODE and take it in WRITE_MODE |
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161 | rwlock_rd_unlock( &mapper->lock ); |
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162 | rwlock_wr_lock( &mapper->lock ); |
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163 | |
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164 | // second test on missing page because the page status can have been modified |
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165 | // by another thread, when passing from READ_MODE to WRITE_MODE. |
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166 | // from this point there is no concurrent accesses to mapper. |
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167 | |
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168 | page = grdxt_lookup( &mapper->radix , index ); |
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169 | |
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170 | if ( page == NULL ) // missing page => create it and load it from file system |
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171 | { |
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172 | mapper_dmsg("\n[DMSG] %s : missing page => load from device\n", __FUNCTION__ ); |
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173 | |
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174 | // allocate one page from PPM |
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175 | req.type = KMEM_PAGE; |
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176 | req.size = 0; |
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177 | req.flags = AF_NONE; |
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178 | page = kmem_alloc( &req ); |
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179 | |
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180 | if( page == NULL ) |
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181 | { |
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182 | printk("\n[ERROR] in %s : thread %x cannot allocate a page in cluster %x\n", |
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183 | __FUNCTION__ , this->trdid , local_cxy ); |
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184 | rwlock_wr_unlock( &mapper->lock ); |
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185 | return NULL; |
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186 | } |
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187 | |
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188 | // initialize the page descriptor |
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189 | page_init( page ); |
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190 | page_set_flag( page , PG_INIT ); |
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191 | page_set_flag( page , PG_INLOAD ); |
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192 | page_refcount_up( page ); |
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193 | page->mapper = mapper; |
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194 | page->index = index; |
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195 | |
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196 | // insert page in mapper radix tree |
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197 | error = grdxt_insert( &mapper->radix, index , page ); |
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198 | |
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199 | // release mapper lock from WRITE_MODE |
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200 | rwlock_wr_unlock( &mapper->lock ); |
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201 | |
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202 | if( error ) |
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203 | { |
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204 | printk("\n[ERROR] in %s : thread %x cannot insert page in mapper\n", |
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205 | __FUNCTION__ , this->trdid ); |
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206 | mapper_release_page( mapper , page ); |
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207 | page_clear_flag( page , PG_ALL ); |
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208 | req.ptr = page; |
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209 | req.type = KMEM_PAGE; |
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210 | kmem_free(&req); |
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211 | return NULL; |
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212 | } |
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213 | |
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214 | // launch I/O operation to load page from file system |
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215 | error = vfs_mapper_move_page( page, |
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216 | true ); // to mapper |
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217 | |
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218 | if( error ) |
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219 | { |
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220 | printk("\n[ERROR] in %s : thread %x cannot load page from device\n", |
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221 | __FUNCTION__ , this->trdid ); |
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222 | mapper_release_page( mapper , page ); |
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223 | page_clear_flag( page , PG_ALL ); |
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224 | req.ptr = page; |
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225 | req.type = KMEM_PAGE; |
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226 | kmem_free( &req ); |
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227 | return NULL; |
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228 | } |
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229 | |
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230 | // reset the page INLOAD flag to make the page available to all readers |
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231 | page_clear_flag( page , PG_INLOAD ); |
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232 | |
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233 | } |
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234 | else if( page_is_flag( page , PG_INLOAD ) ) // page is loaded by another thread |
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235 | { |
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236 | // release mapper lock from WRITE_MODE |
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237 | rwlock_wr_unlock( &mapper->lock ); |
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238 | |
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239 | // deschedule to wait load completion |
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240 | while( 1 ) |
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241 | { |
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242 | // exit waiting loop when loaded |
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243 | if( page_is_flag( page , PG_INLOAD ) ) break; |
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244 | |
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245 | // deschedule |
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246 | sched_yield( NULL ); |
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247 | } |
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248 | } |
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249 | } |
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250 | else // page available in mapper |
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251 | { |
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252 | |
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253 | rwlock_rd_unlock( &mapper->lock ); |
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254 | } |
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255 | |
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256 | mapper_dmsg("\n[DMSG] %s : exit for page %d / mapper %x / page_desc = %x\n", |
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257 | __FUNCTION__ , index , mapper , page ); |
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258 | |
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259 | return page; |
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260 | |
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261 | } // end mapper_get_page() |
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262 | |
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263 | /////////////////////////////////////////////// |
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264 | error_t mapper_release_page( mapper_t * mapper, |
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265 | page_t * page ) |
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266 | { |
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267 | error_t error; |
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268 | |
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269 | // lauch IO operation to update page to file system |
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270 | error = vfs_mapper_move_page( page , false ); // from mapper |
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271 | |
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272 | if( error ) |
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273 | { |
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274 | printk("\n[ERROR] in %s : cannot update file system\n", __FUNCTION__ ); |
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275 | return EIO; |
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276 | } |
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277 | |
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278 | // take mapper lock in WRITE_MODE |
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279 | rwlock_wr_lock( &mapper->lock ); |
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280 | |
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281 | // remove physical page from radix tree |
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282 | grdxt_remove( &mapper->radix , page->index ); |
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283 | |
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284 | // release mapper lock from WRITE_MODE |
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285 | rwlock_wr_unlock( &mapper->lock ); |
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286 | |
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287 | // release page to PPM |
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288 | kmem_req_t req; |
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289 | req.type = KMEM_PAGE; |
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290 | req.ptr = page; |
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291 | kmem_free( &req ); |
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292 | |
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293 | return 0; |
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294 | |
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295 | } // end mapper_release_page() |
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296 | |
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297 | /////////////////////////////////////////////////// |
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298 | error_t mapper_move_user( mapper_t * mapper, |
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299 | bool_t to_buffer, |
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300 | uint32_t file_offset, |
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301 | void * buffer, |
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302 | uint32_t size ) |
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303 | { |
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304 | uint32_t page_offset; // first byte to move to/from a mapper page |
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305 | uint32_t page_count; // number of bytes to move to/from a mapper page |
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306 | uint32_t index; // current mapper page index |
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307 | uint32_t done; // number of moved bytes |
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308 | page_t * page; // current mapper page descriptor |
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309 | uint8_t * map_ptr; // current mapper address |
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310 | uint8_t * buf_ptr; // current buffer address |
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311 | |
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312 | mapper_dmsg("\n[DMSG] %s : enters / to_buf = %d / buffer = %x\n", |
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313 | __FUNCTION__ , to_buffer , buffer ); |
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314 | |
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315 | // compute offsets of first and last bytes in file |
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316 | uint32_t min_byte = file_offset; |
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317 | uint32_t max_byte = file_offset + size -1; |
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318 | |
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319 | // compute indexes of pages for first and last byte in mapper |
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320 | uint32_t first = min_byte >> CONFIG_PPM_PAGE_SHIFT; |
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321 | uint32_t last = max_byte >> CONFIG_PPM_PAGE_SHIFT; |
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322 | |
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323 | done = 0; |
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324 | |
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325 | // loop on pages in mapper |
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326 | for( index = first ; index <= last ; index++ ) |
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327 | { |
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328 | // compute page_offset |
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329 | if( index == first ) page_offset = min_byte & CONFIG_PPM_PAGE_MASK; |
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330 | else page_offset = 0; |
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331 | |
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332 | // compute number of bytes in page |
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333 | if ( first == last ) page_count = size; |
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334 | else if ( index == first ) page_count = CONFIG_PPM_PAGE_SIZE - page_offset; |
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335 | else if ( index == last ) page_count = (max_byte & CONFIG_PPM_PAGE_MASK) + 1; |
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336 | else page_count = CONFIG_PPM_PAGE_SIZE; |
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337 | |
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338 | mapper_dmsg("\n[DMSG] %s : index = %d / offset = %d / count = %d\n", |
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339 | __FUNCTION__ , index , page_offset , page_count ); |
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340 | |
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341 | // get page descriptor |
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342 | page = mapper_get_page( mapper , index ); |
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343 | |
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344 | if ( page == NULL ) return EINVAL; |
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345 | |
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346 | // compute pointer in mapper |
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347 | xptr_t base_xp = ppm_page2base( XPTR( local_cxy, page ) ); |
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348 | map_ptr = (uint8_t *)GET_PTR( base_xp ) + page_offset; |
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349 | |
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350 | // compute pointer in buffer |
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351 | buf_ptr = (uint8_t *)buffer + done; |
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352 | |
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353 | mapper_dmsg("\n[DMSG] %s : index = %d / buf_ptr = %x / map_ptr = %x\n", |
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354 | __FUNCTION__ , index , buf_ptr , map_ptr ); |
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355 | |
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356 | // move fragment |
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357 | if( to_buffer ) |
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358 | { |
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359 | hal_copy_to_uspace( buf_ptr , map_ptr , page_count ); |
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360 | } |
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361 | else |
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362 | { |
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363 | page_do_dirty( page ); |
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364 | hal_copy_from_uspace( map_ptr , buf_ptr , page_count ); |
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365 | } |
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366 | |
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367 | done += page_count; |
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368 | } |
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369 | |
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370 | mapper_dmsg("\n[DMSG] %s : exit for buffer %x\n", |
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371 | __FUNCTION__, buffer ); |
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372 | |
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373 | return 0; |
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374 | |
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375 | } // end mapper_move_user() |
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376 | |
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377 | //////////////////////////////////////////////// |
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378 | error_t mapper_move_kernel( mapper_t * mapper, |
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379 | bool_t to_buffer, |
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380 | uint32_t file_offset, |
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381 | xptr_t buffer_xp, |
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382 | uint32_t size ) |
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383 | { |
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384 | uint32_t page_offset; // first byte to move to/from a mapper page |
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385 | uint32_t page_count; // number of bytes to move to/from a mapper page |
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386 | uint32_t index; // current mapper page index |
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387 | uint32_t done; // number of moved bytes |
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388 | page_t * page; // current mapper page descriptor |
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389 | |
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390 | uint8_t * src_ptr; // source buffer local pointer |
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391 | cxy_t src_cxy; // source cluster |
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392 | uint8_t * dst_ptr; // destination buffer local pointer |
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393 | cxy_t dst_cxy; // destination cluster |
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394 | |
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395 | // get buffer cluster and local pointer |
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396 | cxy_t buffer_cxy = GET_CXY( buffer_xp ); |
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397 | uint8_t * buffer_ptr = (uint8_t *)GET_PTR( buffer_xp ); |
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398 | |
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399 | mapper_dmsg("\n[DMSG] %s : to_buf = %d / buf_cxy = %x / buf_ptr = %x / size = %x\n", |
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400 | __FUNCTION__ , to_buffer , buffer_cxy , buffer_ptr , size ); |
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401 | |
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402 | // compute offsets of first and last bytes in file |
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403 | uint32_t min_byte = file_offset; |
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404 | uint32_t max_byte = file_offset + size -1; |
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405 | |
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406 | // compute indexes for first and last pages in mapper |
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407 | uint32_t first = min_byte >> CONFIG_PPM_PAGE_SHIFT; |
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408 | uint32_t last = max_byte >> CONFIG_PPM_PAGE_SHIFT; |
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409 | |
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410 | mapper_dmsg("\n[DMSG] %s : first_page = %d / last_page = %d\n", |
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411 | __FUNCTION__ , first , last ); |
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412 | |
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413 | // compute source and destination clusters |
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414 | if( to_buffer ) |
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415 | { |
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416 | dst_cxy = buffer_cxy; |
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417 | src_cxy = local_cxy; |
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418 | } |
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419 | else |
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420 | { |
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421 | src_cxy = buffer_cxy; |
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422 | dst_cxy = local_cxy; |
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423 | } |
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424 | |
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425 | done = 0; |
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426 | |
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427 | // loop on pages in mapper |
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428 | for( index = first ; index <= last ; index++ ) |
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429 | { |
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430 | // compute page_offset |
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431 | if( index == first ) page_offset = min_byte & CONFIG_PPM_PAGE_MASK; |
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432 | else page_offset = 0; |
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433 | |
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434 | // compute number of bytes to move in page |
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435 | if ( first == last ) page_count = size; |
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436 | else if ( index == first ) page_count = CONFIG_PPM_PAGE_SIZE - page_offset; |
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437 | else if ( index == last ) page_count = (max_byte & CONFIG_PPM_PAGE_MASK) + 1; |
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438 | else page_count = CONFIG_PPM_PAGE_SIZE; |
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439 | |
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440 | mapper_dmsg("\n[DMSG] %s : page_index = %d / offset = %d / bytes = %d\n", |
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441 | __FUNCTION__ , index , page_offset , page_count ); |
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442 | |
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443 | // get page descriptor |
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444 | page = mapper_get_page( mapper , index ); |
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445 | |
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446 | if ( page == NULL ) return EINVAL; |
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447 | |
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448 | // get page base address |
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449 | xptr_t base_xp = ppm_page2base( XPTR( local_cxy , page ) ); |
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450 | uint8_t * base_ptr = (uint8_t *)GET_PTR( base_xp ); |
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451 | |
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452 | // compute source and destination pointers |
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453 | if( to_buffer ) |
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454 | { |
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455 | dst_ptr = buffer_ptr + done; |
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456 | src_ptr = base_ptr + page_offset; |
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457 | } |
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458 | else |
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459 | { |
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460 | src_ptr = buffer_ptr + done; |
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461 | dst_ptr = base_ptr + page_offset; |
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462 | |
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463 | page_do_dirty( page ); |
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464 | } |
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465 | |
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466 | // move fragment |
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467 | hal_remote_memcpy( XPTR( dst_cxy , dst_ptr ), XPTR( src_cxy , src_ptr ), page_count ); |
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468 | |
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469 | done += page_count; |
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470 | } |
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471 | |
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472 | mapper_dmsg("\n[DMSG] %s : exit / buf_cxy = %x / buf_ptr = %x / size = %x\n", |
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473 | __FUNCTION__ , buffer_cxy , buffer_ptr , size ); |
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474 | |
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475 | return 0; |
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476 | |
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477 | } // end mapper_move_kernel() |
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478 | |
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