1 | /* |
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2 | * chdev.c - channel device descriptor operations implementation. |
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3 | * |
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4 | * Authors Alain Greiner (2016) |
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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 <kernel_config.h> |
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25 | #include <hal_types.h> |
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26 | #include <hal_special.h> |
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27 | #include <hal_irqmask.h> |
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28 | #include <printk.h> |
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29 | #include <boot_info.h> |
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30 | #include <xlist.h> |
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31 | #include <kmem.h> |
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32 | #include <scheduler.h> |
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33 | #include <thread.h> |
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34 | #include <rpc.h> |
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35 | #include <chdev.h> |
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36 | #include <devfs.h> |
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37 | |
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38 | |
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39 | extern chdev_directory_t chdev_dir; // allocated in kernel_init.c |
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40 | |
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41 | #if (CONFIG_DEBUG_SYS_READ & 1) |
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42 | extern uint32_t enter_chdev_cmd_read; |
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43 | extern uint32_t exit_chdev_cmd_read; |
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44 | extern uint32_t enter_chdev_server_read; |
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45 | extern uint32_t exit_chdev_server_read; |
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46 | #endif |
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47 | |
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48 | #if (CONFIG_DEBUG_SYS_WRITE & 1) |
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49 | extern uint32_t enter_chdev_cmd_write; |
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50 | extern uint32_t exit_chdev_cmd_write; |
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51 | extern uint32_t enter_chdev_server_write; |
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52 | extern uint32_t exit_chdev_server_write; |
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53 | #endif |
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54 | |
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55 | //////////////////////////////////////////// |
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56 | char * chdev_func_str( uint32_t func_type ) |
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57 | { |
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58 | if ( func_type == DEV_FUNC_RAM ) return "RAM"; |
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59 | else if( func_type == DEV_FUNC_ROM ) return "ROM"; |
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60 | else if( func_type == DEV_FUNC_FBF ) return "FBF"; |
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61 | else if( func_type == DEV_FUNC_IOB ) return "IOB"; |
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62 | else if( func_type == DEV_FUNC_IOC ) return "IOC"; |
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63 | else if( func_type == DEV_FUNC_MMC ) return "MMC"; |
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64 | else if( func_type == DEV_FUNC_DMA ) return "DMA"; |
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65 | else if( func_type == DEV_FUNC_NIC ) return "NIC"; |
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66 | else if( func_type == DEV_FUNC_TIM ) return "TIM"; |
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67 | else if( func_type == DEV_FUNC_TXT ) return "TXT"; |
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68 | else if( func_type == DEV_FUNC_ICU ) return "ICU"; |
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69 | else if( func_type == DEV_FUNC_PIC ) return "PIC"; |
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70 | else return "undefined"; |
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71 | } |
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72 | |
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73 | ///////////////////////////////////////// |
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74 | chdev_t * chdev_create( uint32_t func, |
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75 | uint32_t impl, |
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76 | uint32_t channel, |
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77 | uint32_t is_rx, |
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78 | xptr_t base ) |
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79 | { |
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80 | chdev_t * chdev; |
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81 | kmem_req_t req; |
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82 | |
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83 | // allocate memory for chdev |
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84 | req.type = KMEM_DEVICE; |
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85 | req.flags = AF_ZERO; |
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86 | chdev = (chdev_t *)kmem_alloc( &req ); |
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87 | |
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88 | if( chdev == NULL ) return NULL; |
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89 | |
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90 | // initialize waiting threads queue and associated lock |
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91 | remote_spinlock_init( XPTR( local_cxy , &chdev->wait_lock ) ); |
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92 | xlist_root_init( XPTR( local_cxy , &chdev->wait_root ) ); |
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93 | |
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94 | // initialize attributes |
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95 | chdev->func = func; |
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96 | chdev->impl = impl; |
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97 | chdev->channel = channel; |
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98 | chdev->is_rx = is_rx; |
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99 | chdev->base = base; |
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100 | |
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101 | return chdev; |
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102 | |
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103 | } // end chdev_create() |
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104 | |
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105 | /////////////////////////////////// |
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106 | void chdev_print( chdev_t * chdev ) |
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107 | { |
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108 | printk("\n - func = %s" |
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109 | "\n - channel = %d" |
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110 | "\n - base = %l" |
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111 | "\n - cmd = %x" |
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112 | "\n - isr = %x" |
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113 | "\n - chdev = %x\n", |
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114 | chdev_func_str(chdev->func), |
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115 | chdev->channel, |
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116 | chdev->base, |
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117 | chdev->cmd, |
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118 | chdev->isr, |
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119 | chdev ); |
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120 | } |
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121 | |
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122 | ////////////////////////////////////////////////// |
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123 | void chdev_register_command( xptr_t chdev_xp ) |
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124 | { |
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125 | thread_t * server_ptr; // local pointer on server thread associated to chdev |
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126 | core_t * core_ptr; // local pointer on core running the server thread |
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127 | uint32_t lid; // core running the server thread local index |
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128 | xptr_t lock_xp; // extended pointer on lock protecting the chdev queue |
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129 | uint32_t different; // non zero if server thread core != client thread core |
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130 | uint32_t save_sr; // for critical section |
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131 | |
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132 | #if (CONFIG_DEBUG_SYS_READ & 1) |
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133 | enter_chdev_cmd_read = (uint32_t)hal_get_cycles(); |
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134 | #endif |
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135 | |
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136 | #if (CONFIG_DEBUG_SYS_WRITE & 1) |
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137 | enter_chdev_cmd_write = (uint32_t)hal_get_cycles(); |
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138 | #endif |
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139 | |
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140 | thread_t * this = CURRENT_THREAD; |
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141 | |
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142 | // get device descriptor cluster and local pointer |
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143 | cxy_t chdev_cxy = GET_CXY( chdev_xp ); |
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144 | chdev_t * chdev_ptr = (chdev_t *)GET_PTR( chdev_xp ); |
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145 | |
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146 | #if (CONFIG_DEBUG_CHDEV_CMD_RX || CONFIG_DEBUG_CHDEV_CMD_TX) |
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147 | bool_t is_rx = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->is_rx ) ); |
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148 | #endif |
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149 | |
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150 | #if CONFIG_DEBUG_CHDEV_CMD_RX |
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151 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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152 | if( (is_rx) && (CONFIG_DEBUG_CHDEV_CMD_RX < rx_cycle) ) |
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153 | printk("\n[DBG] %s : client_thread %x (%s) enter for RX / cycle %d\n", |
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154 | __FUNCTION__, this, thread_type_str(this->type) , rx_cycle ); |
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155 | #endif |
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156 | |
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157 | #if CONFIG_DEBUG_CHDEV_CMD_TX |
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158 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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159 | if( (is_rx == 0) && (CONFIG_DEBUG_CHDEV_CMD_TX < tx_cycle) ) |
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160 | printk("\n[DBG] %s : client_thread %x (%s) enter for TX / cycle %d\n", |
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161 | __FUNCTION__, this, thread_type_str(this->type) , tx_cycle ); |
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162 | #endif |
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163 | |
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164 | // build extended pointers on client thread xlist and device root |
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165 | xptr_t list_xp = XPTR( local_cxy , &this->wait_list ); |
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166 | xptr_t root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root ); |
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167 | |
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168 | // get local pointer on server thread |
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169 | server_ptr = (thread_t *)hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server) ); |
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170 | |
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171 | // build extended pointer on chdev lock protecting queue |
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172 | lock_xp = XPTR( chdev_cxy , &chdev_ptr->wait_lock ); |
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173 | |
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174 | // get local pointer on core running the server thread |
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175 | core_ptr = (core_t *)hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->core ) ); |
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176 | |
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177 | // get core local index |
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178 | lid = hal_remote_lw( XPTR( chdev_cxy , &core_ptr->lid ) ); |
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179 | |
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180 | // compute server core != thread core |
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181 | different = (lid != this->core->lid) || (local_cxy != chdev_cxy); |
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182 | |
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183 | // enter critical section to make atomic : |
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184 | // (1) client blocking |
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185 | // (2) client registration in server queue |
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186 | // (3) IPI to force server scheduling |
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187 | // (4) descheduling |
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188 | // ... in this order |
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189 | hal_disable_irq( &save_sr ); |
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190 | |
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191 | // block current thread |
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192 | thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO ); |
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193 | |
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194 | // register client thread in waiting queue |
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195 | remote_spinlock_lock( lock_xp ); |
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196 | xlist_add_last( root_xp , list_xp ); |
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197 | remote_spinlock_unlock( lock_xp ); |
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198 | |
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199 | // send IPI to core running the server thread if required |
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200 | if( different ) dev_pic_send_ipi( chdev_cxy , lid ); |
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201 | |
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202 | // deschedule |
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203 | assert( thread_can_yield( this ) , __FUNCTION__ , "illegal sched_yield\n" ); |
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204 | sched_yield("blocked on I/O"); |
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205 | |
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206 | // exit critical section |
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207 | hal_restore_irq( save_sr ); |
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208 | |
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209 | #if CONFIG_DEBUG_CHDEV_CMD_RX |
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210 | rx_cycle = (uint32_t)hal_get_cycles(); |
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211 | if( (is_rx) && (CONFIG_DEBUG_CHDEV_CMD_RX < rx_cycle) ) |
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212 | printk("\n[DBG] %s : client_thread %x (%s) exit for RX / cycle %d\n", |
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213 | __FUNCTION__, this, thread_type_str(this->type) , rx_cycle ); |
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214 | #endif |
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215 | |
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216 | #if CONFIG_DEBUG_CHDEV_CMD_TX |
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217 | tx_cycle = (uint32_t)hal_get_cycles(); |
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218 | if( (is_rx == 0) && (CONFIG_DEBUG_CHDEV_CMD_TX < tx_cycle) ) |
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219 | printk("\n[DBG] %s : client_thread %x (%s) exit for TX / cycle %d\n", |
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220 | __FUNCTION__, this, thread_type_str(this->type) , tx_cycle ); |
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221 | #endif |
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222 | |
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223 | #if (CONFIG_DEBUG_SYS_READ & 1) |
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224 | exit_chdev_cmd_read = (uint32_t)hal_get_cycles(); |
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225 | #endif |
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226 | |
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227 | #if (CONFIG_DEBUG_SYS_WRITE & 1) |
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228 | exit_chdev_cmd_write = (uint32_t)hal_get_cycles(); |
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229 | #endif |
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230 | |
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231 | } // end chdev_register_command() |
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232 | |
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233 | /////////////////////////////////////////////// |
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234 | void chdev_sequencial_server( chdev_t * chdev ) |
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235 | { |
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236 | xptr_t client_xp; // extended pointer on waiting thread |
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237 | cxy_t client_cxy; // cluster of client thread |
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238 | thread_t * client_ptr; // local pointer on client thread |
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239 | thread_t * server; // local pointer on server thread |
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240 | xptr_t root_xp; // extended pointer on device waiting queue root |
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241 | xptr_t lock_xp; // extended pointer on lock ptotecting chdev queue |
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242 | |
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243 | server = CURRENT_THREAD; |
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244 | |
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245 | // get root and lock on command queue |
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246 | root_xp = XPTR( local_cxy , &chdev->wait_root ); |
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247 | lock_xp = XPTR( local_cxy , &chdev->wait_lock ); |
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248 | |
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249 | // This infinite loop is executed by the DEV thread |
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250 | // to handle commands registered in the chdev queue. |
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251 | while( 1 ) |
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252 | { |
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253 | // get the lock protecting the waiting queue |
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254 | remote_spinlock_lock( lock_xp ); |
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255 | |
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256 | // check waiting queue state |
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257 | if( xlist_is_empty( root_xp ) ) // waiting queue empty |
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258 | { |
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259 | // release lock |
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260 | remote_spinlock_unlock( lock_xp ); |
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261 | |
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262 | // deschedule |
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263 | sched_yield("I/O queue empty"); |
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264 | } |
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265 | else // waiting queue not empty |
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266 | { |
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267 | // release lock |
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268 | remote_spinlock_unlock( lock_xp ); |
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269 | |
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270 | // get extended pointer on first client thread |
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271 | client_xp = XLIST_FIRST_ELEMENT( root_xp , thread_t , wait_list ); |
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272 | |
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273 | // get client thread cluster, local pointer, and identifier |
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274 | client_cxy = GET_CXY( client_xp ); |
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275 | client_ptr = (thread_t *)GET_PTR( client_xp ); |
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276 | |
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277 | #if CONFIG_DEBUG_CHDEV_SERVER_RX |
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278 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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279 | if( (chdev->is_rx) && (CONFIG_DEBUG_CHDEV_SERVER_RX < rx_cycle) ) |
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280 | printk("\n[DBG] %s : server_thread %x start RX / client %x / cycle %d\n", |
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281 | __FUNCTION__ , server , client_ptr , rx_cycle ); |
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282 | #endif |
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283 | |
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284 | #if CONFIG_DEBUG_CHDEV_SERVER_TX |
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285 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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286 | if( (chdev->is_rx == 0) && (CONFIG_DEBUG_CHDEV_SERVER_TX < tx_cycle) ) |
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287 | printk("\n[DBG] %s : server_thread %x start TX / client %x / cycle %d\n", |
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288 | __FUNCTION__ , server , client_ptr , tx_cycle ); |
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289 | #endif |
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290 | |
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291 | #if (CONFIG_DEBUG_SYS_READ & 1) |
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292 | enter_chdev_server_read = (uint32_t)hal_get_cycles(); |
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293 | #endif |
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294 | |
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295 | #if (CONFIG_DEBUG_SYS_WRITE & 1) |
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296 | enter_chdev_server_write = (uint32_t)hal_get_cycles(); |
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297 | #endif |
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298 | |
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299 | // call driver command function to execute I/O operation |
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300 | chdev->cmd( client_xp ); |
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301 | |
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302 | // remove the client thread from waiting queue |
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303 | remote_spinlock_lock( lock_xp ); |
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304 | xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) ); |
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305 | remote_spinlock_unlock( lock_xp ); |
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306 | |
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307 | // unblock client thread |
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308 | thread_unblock( client_xp , THREAD_BLOCKED_IO ); |
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309 | |
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310 | #if CONFIG_DEBUG_CHDEV_SERVER_RX |
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311 | rx_cycle = (uint32_t)hal_get_cycles(); |
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312 | if( (chdev->is_rx) && (CONFIG_DEBUG_CHDEV_SERVER_RX < rx_cycle) ) |
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313 | printk("\n[DBG] %s : server_thread %x completes RX / client %x / cycle %d\n", |
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314 | __FUNCTION__ , server , client_ptr , rx_cycle ); |
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315 | #endif |
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316 | |
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317 | #if CONFIG_DEBUG_CHDEV_SERVER_TX |
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318 | tx_cycle = (uint32_t)hal_get_cycles(); |
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319 | if( (chdev->is_rx == 0) && (CONFIG_DEBUG_CHDEV_SERVER_TX < tx_cycle) ) |
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320 | printk("\n[DBG] %s : server_thread %x completes TX / client %x / cycle %d\n", |
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321 | __FUNCTION__ , server , client_ptr , tx_cycle ); |
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322 | #endif |
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323 | |
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324 | #if (CONFIG_DEBUG_SYS_READ & 1) |
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325 | exit_chdev_server_read = (uint32_t)hal_get_cycles(); |
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326 | #endif |
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327 | |
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328 | #if (CONFIG_DEBUG_SYS_WRITE & 1) |
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329 | exit_chdev_server_write = (uint32_t)hal_get_cycles(); |
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330 | #endif |
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331 | |
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332 | } |
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333 | } // end while |
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334 | } // end chdev_sequencial_server() |
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335 | |
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336 | //////////////////////////////////////// |
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337 | xptr_t chdev_from_file( xptr_t file_xp ) |
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338 | { |
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339 | cxy_t file_cxy; |
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340 | vfs_file_t * file_ptr; |
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341 | uint32_t inode_type; |
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342 | vfs_inode_t * inode_ptr; |
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343 | chdev_t * chdev_ptr; |
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344 | |
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345 | // get cluster and local pointer on remote file descriptor |
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346 | // associated inode and chdev are stored in same cluster as the file desc. |
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347 | file_cxy = GET_CXY( file_xp ); |
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348 | file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
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349 | |
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350 | // get inode type from file descriptor |
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351 | inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
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352 | inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) ); |
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353 | |
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354 | assert( (inode_type == INODE_TYPE_DEV) , __FUNCTION__ , |
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355 | "inode type %d is not INODE_TYPE_DEV", inode_type ); |
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356 | |
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357 | // get chdev local pointer from inode extension |
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358 | chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) ); |
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359 | |
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360 | return XPTR( file_cxy , chdev_ptr ); |
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361 | |
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362 | } // end chdev_from_file() |
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363 | |
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364 | //////////////////////// |
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365 | void chdev_dir_display() |
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366 | { |
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367 | uint32_t i; |
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368 | cxy_t cxy; |
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369 | chdev_t * ptr; |
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370 | uint32_t base; |
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371 | reg_t save_sr; |
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372 | |
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373 | // get pointers on TXT0 chdev |
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374 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
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375 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
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376 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
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377 | |
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378 | // get extended pointer on remote TXT0 chdev lock |
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379 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
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380 | |
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381 | // get TXT0 lock in busy waiting mode |
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382 | remote_spinlock_lock_busy( lock_xp , &save_sr ); |
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383 | |
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384 | // header |
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385 | nolock_printk("\n***** external chdevs directory *****\n"); |
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386 | |
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387 | // IOB |
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388 | cxy = GET_CXY( chdev_dir.iob ); |
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389 | ptr = GET_PTR( chdev_dir.iob ); |
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390 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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391 | nolock_printk(" - iob : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base); |
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392 | |
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393 | // PIC |
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394 | cxy = GET_CXY( chdev_dir.pic ); |
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395 | ptr = GET_PTR( chdev_dir.pic ); |
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396 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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397 | nolock_printk(" - pic : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base); |
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398 | |
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399 | // TXT |
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400 | for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ ) |
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401 | { |
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402 | cxy = GET_CXY( chdev_dir.txt_rx[i] ); |
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403 | ptr = GET_PTR( chdev_dir.txt_rx[i] ); |
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404 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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405 | nolock_printk(" - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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406 | |
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407 | cxy = GET_CXY( chdev_dir.txt_tx[i] ); |
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408 | ptr = GET_PTR( chdev_dir.txt_tx[i] ); |
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409 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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410 | nolock_printk(" - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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411 | } |
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412 | |
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413 | // IOC |
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414 | for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ ) |
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415 | { |
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416 | cxy = GET_CXY( chdev_dir.ioc[i] ); |
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417 | ptr = GET_PTR( chdev_dir.ioc[i] ); |
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418 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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419 | nolock_printk(" - ioc[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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420 | } |
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421 | |
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422 | // FBF |
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423 | for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ ) |
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424 | { |
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425 | cxy = GET_CXY( chdev_dir.fbf[i] ); |
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426 | ptr = GET_PTR( chdev_dir.fbf[i] ); |
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427 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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428 | nolock_printk(" - fbf[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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429 | } |
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430 | |
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431 | // NIC |
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432 | for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ ) |
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433 | { |
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434 | cxy = GET_CXY( chdev_dir.nic_rx[i] ); |
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435 | ptr = GET_PTR( chdev_dir.nic_rx[i] ); |
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436 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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437 | nolock_printk(" - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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438 | |
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439 | cxy = GET_CXY( chdev_dir.nic_tx[i] ); |
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440 | ptr = GET_PTR( chdev_dir.nic_tx[i] ); |
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441 | base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) ); |
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442 | nolock_printk(" - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base); |
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443 | } |
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444 | |
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445 | // release lock |
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446 | remote_spinlock_unlock_busy( lock_xp , save_sr ); |
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447 | |
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448 | } // end chdev_dir_display() |
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449 | |
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