1 | /* |
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2 | * thread.h - Thread and related operations definition. |
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3 | * |
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4 | * Author Ghassan Almaless (2008,2009,2010,2011,2012) |
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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 | #ifndef _THREAD_H_ |
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26 | #define _THREAD_H_ |
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27 | |
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28 | #include <hal_kernel_types.h> |
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29 | #include <shared_syscalls.h> |
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30 | #include <hal_special.h> |
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31 | #include <xlist.h> |
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32 | #include <list.h> |
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33 | #include <hal_context.h> |
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34 | #include <spinlock.h> |
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35 | #include <core.h> |
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36 | #include <chdev.h> |
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37 | #include <cluster.h> |
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38 | #include <process.h> |
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39 | #include <dev_ioc.h> |
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40 | #include <dev_nic.h> |
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41 | #include <dev_txt.h> |
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42 | #include <dev_mmc.h> |
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43 | #include <dev_dma.h> |
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44 | |
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45 | /*************************************************************************************** |
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46 | * These macros are used to compose or decompose the global thread identifier (TRDID) |
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47 | * to or from cluster identifier / local thread index (CXY , LTID) |
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48 | **************************************************************************************/ |
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49 | |
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50 | #define LTID_FROM_TRDID( trdid ) (ltid_t)(trdid & 0x0000FFFF) |
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51 | #define CXY_FROM_TRDID( trdid ) (cxy_t)(trdid >> 16) |
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52 | #define TRDID( cxy , ltid ) (trdid_t)((cxy << 16) | ltid ) |
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53 | |
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54 | /*************************************************************************************** |
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55 | * This enum defines the thread types. |
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56 | **************************************************************************************/ |
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57 | |
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58 | typedef enum |
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59 | { |
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60 | THREAD_USER = 0, /*! user thread (pthread) */ |
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61 | THREAD_RPC = 1, /*! kernel thread executing pending RPCs */ |
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62 | THREAD_DEV = 2, /*! kernel thread executing I/O device commands */ |
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63 | THREAD_IDLE = 3, /*! kernel idle thread */ |
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64 | } |
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65 | thread_type_t; |
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66 | |
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67 | /*************************************************************************************** |
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68 | * This defines the thread flags bit-vector. |
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69 | **************************************************************************************/ |
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70 | |
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71 | #define THREAD_FLAG_DETACHED 0x0001 /*! This thread is detached from parent */ |
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72 | #define THREAD_FLAG_JOIN_DONE 0x0002 /*! Parent thread made a join request */ |
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73 | #define THREAD_FLAG_KILL_DONE 0x0004 /*! This thread received a kill request */ |
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74 | #define THREAD_FLAG_SCHED 0x0008 /*! Scheduling required for this thread */ |
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75 | #define THREAD_FLAG_REQ_ACK 0x0010 /*! Acknowledge required from scheduler */ |
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76 | #define THREAD_FLAG_REQ_DELETE 0x0020 /*! Destruction required from scheduler */ |
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77 | |
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78 | /*************************************************************************************** |
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79 | * This defines the thread blocking causes bit-vector. |
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80 | **************************************************************************************/ |
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81 | |
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82 | #define THREAD_BLOCKED_GLOBAL 0x0001 /*! thread deactivated / wait activation */ |
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83 | #define THREAD_BLOCKED_IO 0x0002 /*! thread wait IO operation completion */ |
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84 | #define THREAD_BLOCKED_MAPPER 0x0004 /*! thread wait mapper */ |
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85 | #define THREAD_BLOCKED_EXIT 0x0008 /*! thread blocked in join / wait exit */ |
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86 | #define THREAD_BLOCKED_JOIN 0x0010 /*! thread blocked in exit / wait join */ |
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87 | #define THREAD_BLOCKED_SEM 0x0020 /*! thread wait semaphore */ |
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88 | #define THREAD_BLOCKED_PAGE 0x0040 /*! thread wait page access */ |
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89 | #define THREAD_BLOCKED_IDLE 0x0080 /*! thread RPC wait RPC_FIFO non empty */ |
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90 | #define THREAD_BLOCKED_USERSYNC 0x0100 /*! thread wait (cond/mutex/barrier) */ |
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91 | #define THREAD_BLOCKED_RPC 0x0200 /*! thread wait RPC completion */ |
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92 | #define THREAD_BLOCKED_ISR 0x0400 /*! thread DEV wait ISR */ |
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93 | #define THREAD_BLOCKED_WAIT 0x0800 /*! thread wait child process termination */ |
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94 | |
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95 | /*************************************************************************************** |
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96 | * This structure defines thread instrumentation informations. |
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97 | **************************************************************************************/ |
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98 | |
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99 | typedef struct thread_info_s |
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100 | { |
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101 | uint32_t pgfault_nr; /*! cumulated number of page fault */ |
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102 | uint32_t sched_nr; /*! TODO ??? [AG] */ |
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103 | uint32_t u_err_nr; /*! TODO ??? [AG] */ |
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104 | uint32_t m_err_nr; /*! TODO ??? [AG] */ |
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105 | cycle_t last_cycle; /*! last cycle counter value (date) */ |
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106 | cycle_t usr_cycles; /*! user execution duration (cycles) */ |
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107 | cycle_t sys_cycles; /*! system execution duration (cycles) */ |
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108 | } |
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109 | thread_info_t; |
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110 | |
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111 | /*************************************************************************************** |
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112 | * This structure defines a thread descriptor. |
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113 | * It is used for both the user threads and the kernel threads. |
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114 | * In a process, a user thread is identified by a unique TRDID (thread identifier): |
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115 | * - The TRDID 16 LSB bits contain the LTID (Local Thread Index). |
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116 | * - The TRDID 16 MSB bits contain the CXY of cluster containing the thread. |
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117 | * The main thread LTID value is always 0. |
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118 | * The LTID is used to index the th_tbl[] array in the local process descriptor. |
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119 | * This TRDID is computed by the process_register_thread() function, when the user |
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120 | * thread is registered in the local copy of the process descriptor. |
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121 | * WARNING : Don't modify the first 4 fields order, as this order is used by the |
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122 | * hal_kentry assembly code for the TSAR architecture. |
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123 | **************************************************************************************/ |
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124 | |
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125 | #define THREAD_SIGNATURE 0xDEADBEEF |
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126 | |
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127 | typedef struct thread_s |
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128 | { |
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129 | void * cpu_context; /*! pointer on CPU context switch */ |
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130 | void * fpu_context; /*! pointer on FPU context switch */ |
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131 | void * uzone_current; /*! used by hal_do_syscall & hal_do_except */ |
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132 | void * uzone_previous; /*! used by hal_do_syscall & hal_do_except */ |
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133 | |
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134 | intptr_t k_stack_base; /*! kernel stack base address */ |
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135 | uint32_t k_stack_size; /*! kernel stack size (bytes) */ |
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136 | |
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137 | uint32_t trdid; /*! thread index (cxy.ltid) */ |
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138 | thread_type_t type; /*! thread type */ |
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139 | uint32_t quantum; /*! number of clock ticks given to thread */ |
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140 | uint32_t ticks_nr; /*! number of ticks used */ |
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141 | uint32_t time_last_check; /*! last cpu_time_stamp */ |
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142 | core_t * core; /*! pointer to the owner core */ |
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143 | process_t * process; /*! pointer on local process descriptor */ |
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144 | xptr_t parent; /*! extended pointer on parent thread */ |
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145 | |
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146 | remote_spinlock_t join_lock; /*! lock protecting the join/exit */ |
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147 | xptr_t join_xp; /*! joining/killer thread extended pointer */ |
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148 | |
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149 | uint32_t * ack_rsp_count; /*! pointer on acknowledge response counter */ |
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150 | |
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151 | intptr_t u_stack_base; /*! user stack base address */ |
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152 | uint32_t u_stack_size; /*! user stack size (bytes) */ |
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153 | |
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154 | void * entry_func; /*! pointer on entry function */ |
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155 | void * entry_args; /*! pointer on entry function arguments */ |
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156 | uint32_t main_argc; /*! main thread number of arguments */ |
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157 | char ** main_argv; /*! main thread array of strings arguments */ |
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158 | |
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159 | uint32_t flags; /*! bit vector of flags */ |
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160 | uint32_t blocked; /*! bit vector of blocking causes */ |
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161 | |
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162 | error_t errno; /*! errno value set by last system call */ |
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163 | uint32_t utls; /*! user thread local storage */ |
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164 | |
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165 | bool_t fork_user; /*! user defined placement for next fork() */ |
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166 | cxy_t fork_cxy; /*! target cluster for next fork() */ |
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167 | |
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168 | list_entry_t sched_list; /*! member of threads attached to same core */ |
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169 | |
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170 | chdev_t * chdev; /*! chdev pointer (for a DEV thread only) */ |
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171 | |
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172 | reg_t save_sr; /*! used by sched_yield() function */ |
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173 | |
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174 | ioc_command_t ioc_cmd; /*! IOC device generic command */ |
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175 | txt_command_t txt_cmd; /*! TXT device generic command */ |
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176 | nic_command_t nic_cmd; /*! NIC device generic command */ |
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177 | mmc_command_t mmc_cmd; /*! MMC device generic command */ |
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178 | dma_command_t dma_cmd; /*! DMA device generic command */ |
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179 | |
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180 | cxy_t rpc_client_cxy; /*! client cluster index (for a RPC thread) */ |
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181 | |
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182 | xlist_entry_t wait_list; /*! member of threads blocked on same cond */ |
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183 | |
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184 | list_entry_t locks_root; /*! root of list of locks taken */ |
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185 | xlist_entry_t xlocks_root; /*! root of xlist of remote locks taken */ |
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186 | uint32_t local_locks; /*! number of local locks owned by thread */ |
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187 | uint32_t remote_locks; /*! number of remote locks owned by thread */ |
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188 | |
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189 | thread_info_t info; /*! embedded thread_info_t */ |
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190 | |
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191 | uint32_t signature; /*! for kernel stack overflow detection */ |
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192 | } |
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193 | thread_t; |
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194 | |
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195 | /*************************************************************************************** |
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196 | * This macro returns a pointer on the calling thread from the core hardware register. |
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197 | **************************************************************************************/ |
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198 | |
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199 | #define CURRENT_THREAD (hal_get_current_thread()) |
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200 | |
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201 | /*************************************************************************************** |
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202 | * This function returns a printable string for a thread type. |
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203 | *************************************************************************************** |
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204 | * @ type : thread type. |
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205 | * returns pointer on string. |
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206 | **************************************************************************************/ |
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207 | char * thread_type_str( uint32_t type ); |
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208 | |
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209 | /*************************************************************************************** |
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210 | * This function is used by the pthread_create() system call to create a "new" thread |
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211 | * in an existing process. It allocates memory for an user thread descriptor in the |
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212 | * local cluster, and initializes it from information contained in the arguments. |
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213 | * The CPU context is initialized from scratch. |
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214 | * It is registered in the local process descriptor specified by the <pid> argument. |
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215 | * The THREAD_BLOCKED_GLOBAL bit is set => the thread must be activated by the caller |
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216 | * to start at the next scheduling point. |
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217 | *************************************************************************************** |
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218 | * @ pid : process identifier. |
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219 | * @ start_func : pointer on entry function. |
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220 | * @ start_args : pointer on function argument (can be NULL). |
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221 | * @ attr : pointer on pthread attributes descriptor. |
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222 | * @ new_thread : [out] address of buffer for new thread descriptor pointer. |
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223 | * @ returns 0 if success / returns ENOMEM if error. |
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224 | **************************************************************************************/ |
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225 | error_t thread_user_create( pid_t pid, |
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226 | void * start_func, |
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227 | void * start_arg, |
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228 | pthread_attr_t * attr, |
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229 | thread_t ** new_thread ); |
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230 | |
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231 | /*************************************************************************************** |
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232 | * This function is used by the sys_fork() system call to create the "child" thread |
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233 | * in the local cluster. It allocates memory for a thread descriptor, and initializes |
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234 | * it from the "parent" thread descriptor defined by the <parent_thread_xp> argument. |
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235 | * The new thread is attached to the core that has the lowest load in local cluster. |
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236 | * It is registered in the "child" process defined by the <child_process> argument. |
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237 | * This new thread inherits its user stack from the parent thread, as it uses the |
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238 | * Copy-On-Write mechanism to get a private stack when required. |
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239 | * The content of the parent kernel stack is copied into the child kernel stack, as |
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240 | * the Copy-On-Write mechanism cannot be used for kernel segments (because kernel |
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241 | * uses physical addressing on some architectures). |
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242 | * The CPU and FPU execution contexts are created and linked to the new thread. |
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243 | * but the actual context copy is NOT done, and must be done by by the sys_fork(). |
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244 | * The THREAD_BLOCKED_GLOBAL bit is set => the thread must be activated to start. |
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245 | *************************************************************************************** |
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246 | * @ parent_thread_xp : extended pointer on parent thread descriptor. |
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247 | * @ child_process : local pointer on child process descriptor. |
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248 | * @ child_thread : [out] address of buffer for child thread descriptor pointer. |
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249 | * @ returns 0 if success / returns -1 if error. |
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250 | **************************************************************************************/ |
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251 | error_t thread_user_fork( xptr_t parent_thread_xp, |
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252 | process_t * child_process, |
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253 | thread_t ** child_thread ); |
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254 | |
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255 | /*************************************************************************************** |
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256 | * This function is called by the process_make_exec() function to re-initialise the |
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257 | * thread descriptor of the calling thread (that will become the new process main |
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258 | * thread), and immediately jump to user code without returning to kentry!!! |
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259 | * It must be called by the main thread of the calling process. |
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260 | * - A new user stack vseg is created and initialised. |
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261 | * - The kernel stack (currently in use) is not modified. |
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262 | * - The function calls the hal_cpu_context_exec() to re-initialize the CPU context |
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263 | * an jump to user code. |
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264 | *************************************************************************************** |
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265 | * @ entry_func : main thread entry point. |
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266 | * @ argc : number of main thread arguments. |
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267 | * @ argv : array of pointers on stringarguments. |
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268 | * @ returns 0 if success / returns ENOMEM if error. |
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269 | **************************************************************************************/ |
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270 | error_t thread_user_exec( void * entry_func, |
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271 | uint32_t argc, |
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272 | char ** argv); |
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273 | |
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274 | /*************************************************************************************** |
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275 | * This function allocates memory for a kernel thread descriptor in the local cluster, |
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276 | * and initializes it from arguments values. |
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277 | * It is called by kernel_init() to statically create all DEV server threads |
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278 | * It is also called to dynamically create RPC threads when required. |
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279 | * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start. |
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280 | *************************************************************************************** |
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281 | * @ new_thread : address of buffer for new thread pointer. |
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282 | * @ type : kernel thread type. |
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283 | * @ func : pointer on function. |
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284 | * @ args : function arguments. |
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285 | * @ core_lid : local core index. |
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286 | * @ returns 0 if success / returns ENOMEM if error |
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287 | **************************************************************************************/ |
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288 | error_t thread_kernel_create( thread_t ** new_thread, |
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289 | thread_type_t type, |
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290 | void * func, |
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291 | void * args, |
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292 | lid_t core_lid ); |
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293 | |
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294 | /*************************************************************************************** |
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295 | * This function is called by the kernel_init() function to initialize the IDLE thread |
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296 | * descriptor from arguments values. |
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297 | * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start. |
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298 | * It returns a kernel panic if failure. |
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299 | *************************************************************************************** |
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300 | * @ thread : pointer on existing thread descriptor. |
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301 | * @ type : kernel thread type. |
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302 | * @ func : pointer on function. |
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303 | * @ args : function arguments. |
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304 | * @ core_lid : local core index. |
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305 | **************************************************************************************/ |
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306 | void thread_idle_init( thread_t * thread, |
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307 | thread_type_t type, |
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308 | void * func, |
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309 | void * args, |
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310 | lid_t core_lid ); |
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311 | |
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312 | /*************************************************************************************** |
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313 | * This function is called by the sched_handle_signals() function to releases |
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314 | * the physical memory allocated for a thread in a given cluster, when this thread |
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315 | * is marked for delete. This include the thread descriptor itself, the associated |
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316 | * CPU and FPU context, and the physical memory allocated for an user thread local stack. |
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317 | * The destroyed thread is removed from the local process th_tbl[] array, and returns |
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318 | * true when the destroyed thread was the last thread registered in process. |
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319 | *************************************************************************************** |
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320 | * @ thread : pointer on the thread descriptor to release. |
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321 | * @ return true, if the thread was the last registerd thread in local process. |
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322 | **************************************************************************************/ |
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323 | bool_t thread_destroy( thread_t * thread ); |
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324 | |
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325 | /*************************************************************************************** |
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326 | * This function defines the code of the thread executed by all cores after kernel_init, |
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327 | * or when no other thread is runnable for a given core. |
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328 | * It enter and infinite loop in wich: |
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329 | * - it unmask the IRQs |
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330 | * - it optionally calls the hal_core_sleep() function to reduce the power consumption |
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331 | * (this behavior is controlled by the CONFIG_THREAD_IDLE_MODE_SLEEP flag). |
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332 | * - it call the sched_yield() function to find another runnable thread. |
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333 | * |
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334 | * TODO: In the TSAR architecture the hal_core_sleep() function forces the core to |
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335 | * low-power mode. Any IRQ will force the core to exit this low-power mode, but no ISR |
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336 | * is executed. We must analyse if we have the same behaviour for I86 architectures... |
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337 | **************************************************************************************/ |
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338 | void thread_idle_func(); |
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339 | |
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340 | /*************************************************************************************** |
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341 | * This function is used by a "blocker" thread running in the same cluster as a "target" |
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342 | * thread to request the scheduler of the target thread to acknowledge that the target |
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343 | * thread is blocked and not running, at the next context switch. |
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344 | * This function executes atomically the following actions : |
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345 | * - it set the request_pending boolean in the target scheduler descriptor. |
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346 | * - it set the REQ_ACK flag in the "flags" field of the target thread descriptor. |
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347 | * - It registers the responses counter pointer in the target thread descriptor. |
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348 | * The request_pending flag is handled as a set/reset flip-flop by the "blocker" thread |
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349 | * and by the "target" scheduler. |
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350 | *************************************************************************************** |
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351 | * @ target : local pointer on target thread. |
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352 | * @ ack_rsp_count : local pointer on responses counter. |
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353 | **************************************************************************************/ |
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354 | void thread_set_req_ack( thread_t * target, |
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355 | uint32_t * ack_rsp_count ); |
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356 | |
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357 | /*************************************************************************************** |
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358 | * This function is used by the sched_handle_signal() function executed by the |
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359 | * scheduler of a "target" thread to reset a "blocked not running" acknowledge request |
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360 | * in both the target thread descriptor, and in the target thread scheduler. |
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361 | *************************************************************************************** |
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362 | * @ target : local pointer on target thread. |
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363 | **************************************************************************************/ |
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364 | void thread_reset_req_ack( thread_t * target ); |
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365 | |
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366 | /*************************************************************************************** |
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367 | * This function checks if the calling thread can deschedule. |
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368 | *************************************************************************************** |
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369 | * @ returns true if no locks taken. |
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370 | **************************************************************************************/ |
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371 | inline bool_t thread_can_yield(); |
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372 | |
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373 | /*************************************************************************************** |
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374 | * This function implements the delayed descheduling mechanism : It is called by |
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375 | * all lock release functions, and calls the sched_yield() function when all locks |
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376 | * have beeen released and the calling thread THREAD_FLAG_SCHED flag is set. |
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377 | **************************************************************************************/ |
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378 | void thread_check_sched(); |
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379 | |
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380 | /*************************************************************************************** |
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381 | * This function is used by the four sys_thread_cancel(), sys_thread_exit(), |
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382 | * sys_kill() and sys_exit() system calls to mark for delete a given thread. |
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383 | * It set the THREAD_BLOCKED_GLOBAL bit and set the the THREAD_FLAG_REQ_DELETE bit |
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384 | * in the thread descriptor identified by the <thread_xp> argument, to ask the scheduler |
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385 | * to asynchronously delete the target thread, at the next scheduling point. |
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386 | * The calling thread can run in any cluster, as it uses remote accesses, but |
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387 | * the target thread cannot be the main thread of the process identified by the <pid>, |
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388 | * because the main thread must be deleted by the parent process argument. |
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389 | * If the target thread is running in "attached" mode, and the <is_forced> argument |
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390 | * is false, this function implements the required sychronisation with the joining |
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391 | * thread, blocking the calling thread until the pthread_join() syscall is executed. |
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392 | *************************************************************************************** |
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393 | * @ thread_xp : extended pointer on the target thread. |
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394 | * @ pid : process identifier (to get the owner cluster identifier). |
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395 | * @ is_forced : the deletion does not depends on the attached mode. |
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396 | **************************************************************************************/ |
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397 | void thread_delete( xptr_t thread_xp, |
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398 | pid_t pid, |
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399 | bool_t is_forced ); |
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400 | |
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401 | /*************************************************************************************** |
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402 | * This function registers a blocking cause defined by the <cause> argument |
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403 | * in a remote thread descriptor identified by the <thread_xp> argument. |
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404 | * We need an extended pointer, because this function can be called by another thread |
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405 | * than the target thread, executing the sys_kill() function. |
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406 | * WARNING : this function does not deschedule the target thread, and the descheduling |
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407 | * must be explicitely forced by a sched_yield(). |
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408 | *************************************************************************************** |
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409 | * @ thread_xp : extended pointer on remote thread descriptor. |
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410 | * @ cause : mask defining the cause (one hot). |
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411 | **************************************************************************************/ |
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412 | void thread_block( xptr_t thread_xp, |
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413 | uint32_t cause ); |
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414 | |
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415 | /*************************************************************************************** |
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416 | * This function resets the bit identified by the <cause> argument in a remote |
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417 | * thread descriptor identified by the <thread_xp> argument. |
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418 | * We need an extended pointer, because the client thread of an I/O operation on a |
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419 | * given device is not in the same cluster as the associated device descriptor. |
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420 | * WARNING : this function does not reschedule the remote thread. |
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421 | * The scheduling can be forced by sending an IPI to the core running the remote thread. |
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422 | *************************************************************************************** |
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423 | * @ thread_xp : extended pointer the remote thread. |
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424 | * @ cause : mask defining the cause (one hot). |
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425 | * @ return non zero if the bit-vector was actually modified / return 0 otherwise |
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426 | **************************************************************************************/ |
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427 | uint32_t thread_unblock( xptr_t thread_xp, |
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428 | uint32_t cause ); |
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429 | |
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430 | /*************************************************************************************** |
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431 | * This function updates the calling thread user_time or kernel_time counters. |
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432 | *************************************************************************************** |
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433 | * @ thread : local pointer on target thread. |
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434 | * @ is_user : update user time if non zero / update kernel time if zero |
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435 | **************************************************************************************/ |
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436 | void thread_time_update( thread_t * thread, |
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437 | uint32_t is_user ); |
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438 | |
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439 | /*************************************************************************************** |
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440 | * This function returns the extended pointer on a thread descriptor identified |
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441 | * by its thread identifier, and process identifier. |
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442 | * It can be called by any thread running in any cluster. |
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443 | *************************************************************************************** |
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444 | * @ pid : process identifier. |
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445 | * @ trdid : thread identifier. |
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446 | * @ return the extended pointer if thread found / return XPTR_NULL if not found. |
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447 | **************************************************************************************/ |
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448 | xptr_t thread_get_xptr( pid_t pid, |
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449 | trdid_t trdid ); |
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450 | |
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451 | |
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452 | #endif /* _THREAD_H_ */ |
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