1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // kernel.c -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Tue Jan 17 12:27:26 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Mon Aug 31 07:08:20 2020 |
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13 | // Update Count : 71 |
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14 | // |
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15 | |
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16 | #define __cforall_thread__ |
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17 | #define _GNU_SOURCE |
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18 | |
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19 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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20 | |
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21 | //C Includes |
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22 | #include <errno.h> |
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23 | #include <stdio.h> |
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24 | #include <string.h> |
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25 | #include <signal.h> |
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26 | #include <unistd.h> |
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27 | extern "C" { |
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28 | #include <sys/eventfd.h> |
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29 | } |
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30 | |
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31 | //CFA Includes |
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32 | #include "kernel_private.hfa" |
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33 | #include "preemption.hfa" |
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34 | #include "strstream.hfa" |
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35 | #include "device/cpu.hfa" |
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36 | #include "io/types.hfa" |
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37 | |
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38 | //Private includes |
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39 | #define __CFA_INVOKE_PRIVATE__ |
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40 | #include "invoke.h" |
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41 | |
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42 | #if !defined(__CFA_NO_STATISTICS__) |
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43 | #define __STATS( ...) __VA_ARGS__ |
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44 | #else |
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45 | #define __STATS( ...) |
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46 | #endif |
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47 | |
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48 | //----------------------------------------------------------------------------- |
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49 | // Some assembly required |
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50 | #if defined( __i386 ) |
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51 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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52 | // fcw : X87 FPU control word (preserved across function calls) |
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53 | #define __x87_store \ |
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54 | uint32_t __mxcr; \ |
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55 | uint16_t __fcw; \ |
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56 | __asm__ volatile ( \ |
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57 | "stmxcsr %0\n" \ |
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58 | "fnstcw %1\n" \ |
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59 | : "=m" (__mxcr),\ |
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60 | "=m" (__fcw) \ |
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61 | ) |
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62 | |
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63 | #define __x87_load \ |
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64 | __asm__ volatile ( \ |
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65 | "fldcw %1\n" \ |
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66 | "ldmxcsr %0\n" \ |
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67 | ::"m" (__mxcr),\ |
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68 | "m" (__fcw) \ |
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69 | ) |
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70 | |
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71 | #elif defined( __x86_64 ) |
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72 | #define __x87_store \ |
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73 | uint32_t __mxcr; \ |
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74 | uint16_t __fcw; \ |
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75 | __asm__ volatile ( \ |
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76 | "stmxcsr %0\n" \ |
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77 | "fnstcw %1\n" \ |
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78 | : "=m" (__mxcr),\ |
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79 | "=m" (__fcw) \ |
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80 | ) |
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81 | |
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82 | #define __x87_load \ |
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83 | __asm__ volatile ( \ |
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84 | "fldcw %1\n" \ |
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85 | "ldmxcsr %0\n" \ |
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86 | :: "m" (__mxcr),\ |
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87 | "m" (__fcw) \ |
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88 | ) |
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89 | |
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90 | #elif defined( __arm__ ) |
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91 | #define __x87_store |
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92 | #define __x87_load |
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93 | |
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94 | #elif defined( __aarch64__ ) |
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95 | #define __x87_store \ |
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96 | uint32_t __fpcntl[2]; \ |
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97 | __asm__ volatile ( \ |
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98 | "mrs x9, FPCR\n" \ |
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99 | "mrs x10, FPSR\n" \ |
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100 | "stp x9, x10, %0\n" \ |
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101 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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102 | ) |
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103 | |
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104 | #define __x87_load \ |
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105 | __asm__ volatile ( \ |
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106 | "ldp x9, x10, %0\n" \ |
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107 | "msr FPSR, x10\n" \ |
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108 | "msr FPCR, x9\n" \ |
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109 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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110 | ) |
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111 | |
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112 | #else |
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113 | #error unsupported hardware architecture |
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114 | #endif |
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115 | |
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116 | extern thread$ * mainThread; |
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117 | extern processor * mainProcessor; |
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118 | |
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119 | //----------------------------------------------------------------------------- |
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120 | // Kernel Scheduling logic |
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121 | static thread$ * __next_thread(cluster * this); |
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122 | static thread$ * __next_thread_slow(cluster * this); |
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123 | static inline bool __must_unpark( thread$ * thrd ) __attribute((nonnull(1))); |
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124 | static void __run_thread(processor * this, thread$ * dst); |
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125 | static void __wake_one(cluster * cltr); |
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126 | |
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127 | static void idle_sleep(processor * proc, io_future_t & future, eventfd_t & val); |
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128 | static bool mark_idle (__cluster_proc_list & idles, processor & proc); |
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129 | static void mark_awake(__cluster_proc_list & idles, processor & proc); |
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130 | |
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131 | extern void __cfa_io_start( processor * ); |
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132 | extern bool __cfa_io_drain( processor * ); |
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133 | extern bool __cfa_io_flush( processor *, int min_comp ); |
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134 | extern void __cfa_io_stop ( processor * ); |
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135 | static inline bool __maybe_io_drain( processor * ); |
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136 | |
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137 | extern bool __kernel_read(processor * proc, io_future_t & future, char buf[], int fd); |
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138 | |
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139 | extern void __disable_interrupts_hard(); |
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140 | extern void __enable_interrupts_hard(); |
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141 | |
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142 | static inline void __disable_interrupts_checked() { |
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143 | /* paranoid */ verify( __preemption_enabled() ); |
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144 | disable_interrupts(); |
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145 | /* paranoid */ verify( ! __preemption_enabled() ); |
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146 | } |
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147 | |
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148 | static inline void __enable_interrupts_checked( bool poll = true ) { |
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149 | /* paranoid */ verify( ! __preemption_enabled() ); |
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150 | enable_interrupts( poll ); |
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151 | /* paranoid */ verify( __preemption_enabled() ); |
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152 | } |
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153 | |
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154 | |
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155 | //============================================================================================= |
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156 | // Kernel Scheduling logic |
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157 | //============================================================================================= |
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158 | //Main of the processor contexts |
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159 | void main(processorCtx_t & runner) { |
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160 | // Because of a bug, we couldn't initialized the seed on construction |
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161 | // Do it here |
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162 | __cfaabi_tls.rand_seed ^= rdtscl(); |
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163 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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164 | __tls_rand_advance_bck(); |
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165 | |
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166 | processor * this = runner.proc; |
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167 | verify(this); |
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168 | |
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169 | io_future_t future; // used for idle sleep when io_uring is present |
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170 | future.self.ptr = 1p; // mark it as already fulfilled so we know if there is a pending request or not |
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171 | eventfd_t idle_val; |
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172 | |
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173 | __cfa_io_start( this ); |
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174 | |
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175 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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176 | #if !defined(__CFA_NO_STATISTICS__) |
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177 | if( this->print_halts ) { |
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178 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->unique_id, this->name, (void*)this); |
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179 | } |
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180 | #endif |
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181 | |
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182 | { |
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183 | // Setup preemption data |
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184 | preemption_scope scope = { this }; |
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185 | |
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186 | // if we need to run some special setup, now is the time to do it. |
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187 | if(this->init.thrd) { |
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188 | this->init.thrd->curr_cluster = this->cltr; |
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189 | __run_thread(this, this->init.thrd); |
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190 | } |
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191 | |
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192 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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193 | |
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194 | thread$ * readyThread = 0p; |
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195 | MAIN_LOOP: |
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196 | for() { |
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197 | #define OLD_MAIN 1 |
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198 | #if OLD_MAIN |
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199 | // Check if there is pending io |
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200 | __maybe_io_drain( this ); |
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201 | |
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202 | // Try to get the next thread |
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203 | readyThread = __next_thread( this->cltr ); |
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204 | |
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205 | if( !readyThread ) { |
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206 | __cfa_io_flush( this, 0 ); |
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207 | |
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208 | readyThread = __next_thread_slow( this->cltr ); |
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209 | } |
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210 | |
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211 | HALT: |
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212 | if( !readyThread ) { |
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213 | // Don't block if we are done |
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214 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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215 | |
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216 | #if !defined(__CFA_NO_STATISTICS__) |
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217 | __tls_stats()->ready.sleep.halts++; |
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218 | #endif |
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219 | |
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220 | // Push self to idle stack |
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221 | if(!mark_idle(this->cltr->procs, * this)) continue MAIN_LOOP; |
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222 | |
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223 | // Confirm the ready-queue is empty |
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224 | readyThread = __next_thread_slow( this->cltr ); |
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225 | if( readyThread ) { |
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226 | // A thread was found, cancel the halt |
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227 | mark_awake(this->cltr->procs, * this); |
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228 | |
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229 | #if !defined(__CFA_NO_STATISTICS__) |
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230 | __tls_stats()->ready.sleep.cancels++; |
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231 | #endif |
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232 | |
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233 | // continue the mai loop |
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234 | break HALT; |
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235 | } |
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236 | |
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237 | idle_sleep( this, future, idle_val ); |
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238 | |
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239 | // We were woken up, remove self from idle |
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240 | mark_awake(this->cltr->procs, * this); |
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241 | |
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242 | // DON'T just proceed, start looking again |
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243 | continue MAIN_LOOP; |
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244 | } |
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245 | |
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246 | /* paranoid */ verify( readyThread ); |
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247 | |
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248 | // Reset io dirty bit |
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249 | this->io.dirty = false; |
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250 | |
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251 | // We found a thread run it |
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252 | __run_thread(this, readyThread); |
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253 | |
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254 | // Are we done? |
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255 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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256 | |
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257 | if(this->io.pending && !this->io.dirty) { |
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258 | __cfa_io_flush( this, 0 ); |
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259 | } |
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260 | |
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261 | #else |
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262 | #warning new kernel loop |
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263 | SEARCH: { |
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264 | /* paranoid */ verify( ! __preemption_enabled() ); |
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265 | |
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266 | // First, lock the scheduler since we are searching for a thread |
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267 | ready_schedule_lock(); |
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268 | |
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269 | // Try to get the next thread |
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270 | readyThread = pop_fast( this->cltr ); |
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271 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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272 | |
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273 | // If we can't find a thread, might as well flush any outstanding I/O |
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274 | if(this->io.pending) { __cfa_io_flush( this, 0 ); } |
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275 | |
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276 | // Spin a little on I/O, just in case |
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277 | for(5) { |
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278 | __maybe_io_drain( this ); |
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279 | readyThread = pop_fast( this->cltr ); |
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280 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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281 | } |
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282 | |
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283 | // no luck, try stealing a few times |
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284 | for(5) { |
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285 | if( __maybe_io_drain( this ) ) { |
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286 | readyThread = pop_fast( this->cltr ); |
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287 | } else { |
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288 | readyThread = pop_slow( this->cltr ); |
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289 | } |
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290 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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291 | } |
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292 | |
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293 | // still no luck, search for a thread |
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294 | readyThread = pop_search( this->cltr ); |
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295 | if(readyThread) { ready_schedule_unlock(); break SEARCH; } |
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296 | |
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297 | // Don't block if we are done |
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298 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) { |
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299 | ready_schedule_unlock(); |
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300 | break MAIN_LOOP; |
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301 | } |
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302 | |
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303 | __STATS( __tls_stats()->ready.sleep.halts++; ) |
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304 | |
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305 | // Push self to idle stack |
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306 | ready_schedule_unlock(); |
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307 | if(!mark_idle(this->cltr->procs, * this)) goto SEARCH; |
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308 | ready_schedule_lock(); |
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309 | |
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310 | // Confirm the ready-queue is empty |
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311 | __maybe_io_drain( this ); |
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312 | readyThread = pop_search( this->cltr ); |
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313 | ready_schedule_unlock(); |
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314 | |
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315 | if( readyThread ) { |
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316 | // A thread was found, cancel the halt |
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317 | mark_awake(this->cltr->procs, * this); |
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318 | |
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319 | __STATS( __tls_stats()->ready.sleep.cancels++; ) |
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320 | |
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321 | // continue the main loop |
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322 | break SEARCH; |
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323 | } |
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324 | |
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325 | __STATS( if(this->print_halts) __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); ) |
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326 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle_fd); |
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327 | |
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328 | { |
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329 | eventfd_t val; |
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330 | ssize_t ret = read( this->idle_fd, &val, sizeof(val) ); |
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331 | if(ret < 0) { |
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332 | switch((int)errno) { |
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333 | case EAGAIN: |
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334 | #if EAGAIN != EWOULDBLOCK |
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335 | case EWOULDBLOCK: |
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336 | #endif |
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337 | case EINTR: |
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338 | // No need to do anything special here, just assume it's a legitimate wake-up |
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339 | break; |
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340 | default: |
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341 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
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342 | } |
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343 | } |
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344 | } |
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345 | |
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346 | __STATS( if(this->print_halts) __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); ) |
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347 | |
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348 | // We were woken up, remove self from idle |
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349 | mark_awake(this->cltr->procs, * this); |
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350 | |
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351 | // DON'T just proceed, start looking again |
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352 | continue MAIN_LOOP; |
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353 | } |
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354 | |
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355 | RUN_THREAD: |
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356 | /* paranoid */ verify( ! __preemption_enabled() ); |
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357 | /* paranoid */ verify( readyThread ); |
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358 | |
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359 | // Reset io dirty bit |
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360 | this->io.dirty = false; |
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361 | |
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362 | // We found a thread run it |
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363 | __run_thread(this, readyThread); |
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364 | |
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365 | // Are we done? |
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366 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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367 | |
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368 | if(this->io.pending && !this->io.dirty) { |
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369 | __cfa_io_flush( this, 0 ); |
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370 | } |
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371 | |
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372 | ready_schedule_lock(); |
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373 | __maybe_io_drain( this ); |
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374 | ready_schedule_unlock(); |
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375 | #endif |
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376 | } |
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377 | |
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378 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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379 | } |
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380 | |
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381 | __cfa_io_stop( this ); |
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382 | |
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383 | post( this->terminated ); |
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384 | |
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385 | if(this == mainProcessor) { |
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386 | // HACK : the coroutine context switch expects this_thread to be set |
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387 | // and it make sense for it to be set in all other cases except here |
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388 | // fake it |
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389 | __cfaabi_tls.this_thread = mainThread; |
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390 | } |
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391 | |
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392 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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393 | } |
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394 | |
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395 | static int * __volatile_errno() __attribute__((noinline)); |
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396 | static int * __volatile_errno() { asm(""); return &errno; } |
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397 | |
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398 | // KERNEL ONLY |
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399 | // runThread runs a thread by context switching |
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400 | // from the processor coroutine to the target thread |
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401 | static void __run_thread(processor * this, thread$ * thrd_dst) { |
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402 | /* paranoid */ verify( ! __preemption_enabled() ); |
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403 | /* paranoid */ verifyf( thrd_dst->state == Ready || thrd_dst->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", thrd_dst->state, thrd_dst->preempted); |
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404 | /* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next ); |
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405 | __builtin_prefetch( thrd_dst->context.SP ); |
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406 | |
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407 | __cfadbg_print_safe(runtime_core, "Kernel : core %p running thread %p (%s)\n", this, thrd_dst, thrd_dst->self_cor.name); |
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408 | |
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409 | coroutine$ * proc_cor = get_coroutine(this->runner); |
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410 | |
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411 | // set state of processor coroutine to inactive |
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412 | verify(proc_cor->state == Active); |
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413 | proc_cor->state = Blocked; |
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414 | |
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415 | // Actually run the thread |
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416 | RUNNING: while(true) { |
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417 | thrd_dst->preempted = __NO_PREEMPTION; |
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418 | thrd_dst->state = Active; |
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419 | |
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420 | // Update global state |
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421 | kernelTLS().this_thread = thrd_dst; |
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422 | |
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423 | /* paranoid */ verify( ! __preemption_enabled() ); |
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424 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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425 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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426 | /* paranoid */ verify( thrd_dst->context.SP ); |
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427 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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428 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); // add escape condition if we are setting up the processor |
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429 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); // add escape condition if we are setting up the processor |
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430 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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431 | |
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432 | |
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433 | |
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434 | // set context switch to the thread that the processor is executing |
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435 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
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436 | // when __cfactx_switch returns we are back in the processor coroutine |
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437 | |
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438 | |
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439 | |
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440 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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441 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
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442 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->corctx_flag, "ERROR : Destination thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
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443 | /* paranoid */ verify( thrd_dst->context.SP ); |
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444 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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445 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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446 | /* paranoid */ verify( ! __preemption_enabled() ); |
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447 | |
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448 | // Reset global state |
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449 | kernelTLS().this_thread = 0p; |
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450 | |
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451 | // We just finished running a thread, there are a few things that could have happened. |
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452 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
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453 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
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454 | // 4 - Preempted |
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455 | // In case 1, we may have won a race so we can't write to the state again. |
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456 | // In case 2, we lost the race so we now own the thread. |
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457 | |
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458 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
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459 | // The thread was preempted, reschedule it and reset the flag |
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460 | schedule_thread$( thrd_dst, UNPARK_LOCAL ); |
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461 | break RUNNING; |
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462 | } |
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463 | |
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464 | if(unlikely(thrd_dst->state == Halting)) { |
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465 | // The thread has halted, it should never be scheduled/run again |
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466 | // finish the thread |
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467 | __thread_finish( thrd_dst ); |
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468 | break RUNNING; |
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469 | } |
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470 | |
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471 | /* paranoid */ verify( thrd_dst->state == Active ); |
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472 | thrd_dst->state = Blocked; |
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473 | |
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474 | // set state of processor coroutine to active and the thread to inactive |
---|
475 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
---|
476 | switch(old_ticket) { |
---|
477 | case TICKET_RUNNING: |
---|
478 | // This is case 1, the regular case, nothing more is needed |
---|
479 | break RUNNING; |
---|
480 | case TICKET_UNBLOCK: |
---|
481 | #if !defined(__CFA_NO_STATISTICS__) |
---|
482 | __tls_stats()->ready.threads.threads++; |
---|
483 | #endif |
---|
484 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
---|
485 | // In this case, just run it again. |
---|
486 | continue RUNNING; |
---|
487 | default: |
---|
488 | // This makes no sense, something is wrong abort |
---|
489 | abort(); |
---|
490 | } |
---|
491 | } |
---|
492 | |
---|
493 | // Just before returning to the processor, set the processor coroutine to active |
---|
494 | proc_cor->state = Active; |
---|
495 | |
---|
496 | __cfadbg_print_safe(runtime_core, "Kernel : core %p finished running thread %p\n", this, thrd_dst); |
---|
497 | |
---|
498 | #if !defined(__CFA_NO_STATISTICS__) |
---|
499 | __tls_stats()->ready.threads.threads--; |
---|
500 | #endif |
---|
501 | |
---|
502 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
503 | } |
---|
504 | |
---|
505 | // KERNEL_ONLY |
---|
506 | void returnToKernel() { |
---|
507 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
508 | coroutine$ * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
---|
509 | thread$ * thrd_src = kernelTLS().this_thread; |
---|
510 | |
---|
511 | __STATS( thrd_src->last_proc = kernelTLS().this_processor; ) |
---|
512 | |
---|
513 | // Run the thread on this processor |
---|
514 | { |
---|
515 | int local_errno = *__volatile_errno(); |
---|
516 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
517 | __x87_store; |
---|
518 | #endif |
---|
519 | /* paranoid */ verify( proc_cor->context.SP ); |
---|
520 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
521 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
522 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
523 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
524 | __x87_load; |
---|
525 | #endif |
---|
526 | *__volatile_errno() = local_errno; |
---|
527 | } |
---|
528 | |
---|
529 | #if !defined(__CFA_NO_STATISTICS__) |
---|
530 | /* paranoid */ verify( thrd_src->last_proc != 0p ); |
---|
531 | if(thrd_src->last_proc != kernelTLS().this_processor) { |
---|
532 | __tls_stats()->ready.threads.migration++; |
---|
533 | } |
---|
534 | #endif |
---|
535 | |
---|
536 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
537 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
---|
538 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit) || thrd_src->corctx_flag, "ERROR : Returning thread$ %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
---|
539 | } |
---|
540 | |
---|
541 | //----------------------------------------------------------------------------- |
---|
542 | // Scheduler routines |
---|
543 | // KERNEL ONLY |
---|
544 | static void __schedule_thread( thread$ * thrd, unpark_hint hint ) { |
---|
545 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
546 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
547 | /* paranoid */ verify( thrd ); |
---|
548 | /* paranoid */ verify( thrd->state != Halted ); |
---|
549 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
550 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
551 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
552 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
553 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
554 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
555 | /* paranoid */ #endif |
---|
556 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
557 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
558 | |
---|
559 | const bool local = thrd->state != Start; |
---|
560 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
561 | |
---|
562 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
563 | struct cluster * cl = thrd->curr_cluster; |
---|
564 | __STATS(bool outside = hint == UNPARK_LOCAL && thrd->last_proc && thrd->last_proc != kernelTLS().this_processor; ) |
---|
565 | |
---|
566 | // push the thread to the cluster ready-queue |
---|
567 | push( cl, thrd, hint ); |
---|
568 | |
---|
569 | // variable thrd is no longer safe to use |
---|
570 | thrd = 0xdeaddeaddeaddeadp; |
---|
571 | |
---|
572 | // wake the cluster using the save variable. |
---|
573 | __wake_one( cl ); |
---|
574 | |
---|
575 | #if !defined(__CFA_NO_STATISTICS__) |
---|
576 | if( kernelTLS().this_stats ) { |
---|
577 | __tls_stats()->ready.threads.threads++; |
---|
578 | if(outside) { |
---|
579 | __tls_stats()->ready.threads.extunpark++; |
---|
580 | } |
---|
581 | } |
---|
582 | else { |
---|
583 | __atomic_fetch_add(&cl->stats->ready.threads.threads, 1, __ATOMIC_RELAXED); |
---|
584 | __atomic_fetch_add(&cl->stats->ready.threads.extunpark, 1, __ATOMIC_RELAXED); |
---|
585 | } |
---|
586 | #endif |
---|
587 | |
---|
588 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
589 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
590 | } |
---|
591 | |
---|
592 | void schedule_thread$( thread$ * thrd, unpark_hint hint ) { |
---|
593 | ready_schedule_lock(); |
---|
594 | __schedule_thread( thrd, hint ); |
---|
595 | ready_schedule_unlock(); |
---|
596 | } |
---|
597 | |
---|
598 | // KERNEL ONLY |
---|
599 | static inline thread$ * __next_thread(cluster * this) with( *this ) { |
---|
600 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
601 | |
---|
602 | ready_schedule_lock(); |
---|
603 | thread$ * thrd = pop_fast( this ); |
---|
604 | ready_schedule_unlock(); |
---|
605 | |
---|
606 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
607 | return thrd; |
---|
608 | } |
---|
609 | |
---|
610 | // KERNEL ONLY |
---|
611 | static inline thread$ * __next_thread_slow(cluster * this) with( *this ) { |
---|
612 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
613 | |
---|
614 | ready_schedule_lock(); |
---|
615 | thread$ * thrd; |
---|
616 | for(25) { |
---|
617 | thrd = pop_slow( this ); |
---|
618 | if(thrd) goto RET; |
---|
619 | } |
---|
620 | thrd = pop_search( this ); |
---|
621 | |
---|
622 | RET: |
---|
623 | ready_schedule_unlock(); |
---|
624 | |
---|
625 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
626 | return thrd; |
---|
627 | } |
---|
628 | |
---|
629 | static inline bool __must_unpark( thread$ * thrd ) { |
---|
630 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
631 | switch(old_ticket) { |
---|
632 | case TICKET_RUNNING: |
---|
633 | // Wake won the race, the thread will reschedule/rerun itself |
---|
634 | return false; |
---|
635 | case TICKET_BLOCKED: |
---|
636 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
637 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
638 | return true; |
---|
639 | default: |
---|
640 | // This makes no sense, something is wrong abort |
---|
641 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
642 | } |
---|
643 | } |
---|
644 | |
---|
645 | void __kernel_unpark( thread$ * thrd, unpark_hint hint ) { |
---|
646 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
647 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
648 | |
---|
649 | if( !thrd ) return; |
---|
650 | |
---|
651 | if(__must_unpark(thrd)) { |
---|
652 | // Wake lost the race, |
---|
653 | __schedule_thread( thrd, hint ); |
---|
654 | } |
---|
655 | |
---|
656 | /* paranoid */ verify( ready_schedule_islocked()); |
---|
657 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
658 | } |
---|
659 | |
---|
660 | void unpark( thread$ * thrd, unpark_hint hint ) { |
---|
661 | if( !thrd ) return; |
---|
662 | |
---|
663 | if(__must_unpark(thrd)) { |
---|
664 | disable_interrupts(); |
---|
665 | // Wake lost the race, |
---|
666 | schedule_thread$( thrd, hint ); |
---|
667 | enable_interrupts(false); |
---|
668 | } |
---|
669 | } |
---|
670 | |
---|
671 | void park( void ) { |
---|
672 | __disable_interrupts_checked(); |
---|
673 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
674 | returnToKernel(); |
---|
675 | __enable_interrupts_checked(); |
---|
676 | |
---|
677 | } |
---|
678 | |
---|
679 | extern "C" { |
---|
680 | // Leave the thread monitor |
---|
681 | // last routine called by a thread. |
---|
682 | // Should never return |
---|
683 | void __cfactx_thrd_leave() { |
---|
684 | thread$ * thrd = active_thread(); |
---|
685 | monitor$ * this = &thrd->self_mon; |
---|
686 | |
---|
687 | // Lock the monitor now |
---|
688 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
689 | |
---|
690 | disable_interrupts(); |
---|
691 | |
---|
692 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
693 | /* paranoid */ verify( thrd->state == Active ); |
---|
694 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
695 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
696 | /* paranoid */ verify( thrd->context.SP ); |
---|
697 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) > ((uintptr_t)__get_stack(thrd->curr_cor)->limit), "ERROR : thread$ %p has been corrupted.\n StackPointer too large.\n", thrd ); |
---|
698 | /* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) < ((uintptr_t)__get_stack(thrd->curr_cor)->base ), "ERROR : thread$ %p has been corrupted.\n StackPointer too small.\n", thrd ); |
---|
699 | |
---|
700 | thrd->state = Halting; |
---|
701 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
702 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
703 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
704 | |
---|
705 | // Leave the thread |
---|
706 | returnToKernel(); |
---|
707 | |
---|
708 | // Control flow should never reach here! |
---|
709 | abort(); |
---|
710 | } |
---|
711 | } |
---|
712 | |
---|
713 | // KERNEL ONLY |
---|
714 | bool force_yield( __Preemption_Reason reason ) { |
---|
715 | __disable_interrupts_checked(); |
---|
716 | thread$ * thrd = kernelTLS().this_thread; |
---|
717 | /* paranoid */ verify(thrd->state == Active); |
---|
718 | |
---|
719 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
720 | // it was going to park itself. If that is the case and it is already using the |
---|
721 | // intrusive fields then we can't use them to preempt the thread |
---|
722 | // If that is the case, abandon the preemption. |
---|
723 | bool preempted = false; |
---|
724 | if(thrd->link.next == 0p) { |
---|
725 | preempted = true; |
---|
726 | thrd->preempted = reason; |
---|
727 | returnToKernel(); |
---|
728 | } |
---|
729 | __enable_interrupts_checked( false ); |
---|
730 | return preempted; |
---|
731 | } |
---|
732 | |
---|
733 | //============================================================================================= |
---|
734 | // Kernel Idle Sleep |
---|
735 | //============================================================================================= |
---|
736 | // Wake a thread from the front if there are any |
---|
737 | static void __wake_one(cluster * this) { |
---|
738 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
739 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
740 | |
---|
741 | // Check if there is a sleeping processor |
---|
742 | int fd = __atomic_load_n(&this->procs.fd, __ATOMIC_SEQ_CST); |
---|
743 | |
---|
744 | // If no one is sleeping, we are done |
---|
745 | if( fd == 0 ) return; |
---|
746 | |
---|
747 | // We found a processor, wake it up |
---|
748 | eventfd_t val; |
---|
749 | val = 1; |
---|
750 | eventfd_write( fd, val ); |
---|
751 | |
---|
752 | #if !defined(__CFA_NO_STATISTICS__) |
---|
753 | if( kernelTLS().this_stats ) { |
---|
754 | __tls_stats()->ready.sleep.wakes++; |
---|
755 | } |
---|
756 | else { |
---|
757 | __atomic_fetch_add(&this->stats->ready.sleep.wakes, 1, __ATOMIC_RELAXED); |
---|
758 | } |
---|
759 | #endif |
---|
760 | |
---|
761 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
762 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
763 | |
---|
764 | return; |
---|
765 | } |
---|
766 | |
---|
767 | // Unconditionnaly wake a thread |
---|
768 | void __wake_proc(processor * this) { |
---|
769 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
770 | |
---|
771 | __disable_interrupts_checked(); |
---|
772 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
773 | eventfd_t val; |
---|
774 | val = 1; |
---|
775 | eventfd_write( this->idle_fd, val ); |
---|
776 | __enable_interrupts_checked(); |
---|
777 | } |
---|
778 | |
---|
779 | static void idle_sleep(processor * this, io_future_t & future, eventfd_t & val) { |
---|
780 | #if !defined(IO_URING_IDLE) || !defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
781 | #if !defined(__CFA_NO_STATISTICS__) |
---|
782 | if(this->print_halts) { |
---|
783 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->unique_id, rdtscl()); |
---|
784 | } |
---|
785 | #endif |
---|
786 | |
---|
787 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle_fd); |
---|
788 | |
---|
789 | { |
---|
790 | eventfd_t val; |
---|
791 | ssize_t ret = read( this->idle_fd, &val, sizeof(val) ); |
---|
792 | if(ret < 0) { |
---|
793 | switch((int)errno) { |
---|
794 | case EAGAIN: |
---|
795 | #if EAGAIN != EWOULDBLOCK |
---|
796 | case EWOULDBLOCK: |
---|
797 | #endif |
---|
798 | case EINTR: |
---|
799 | // No need to do anything special here, just assume it's a legitimate wake-up |
---|
800 | break; |
---|
801 | default: |
---|
802 | abort( "KERNEL : internal error, read failure on idle eventfd, error(%d) %s.", (int)errno, strerror( (int)errno ) ); |
---|
803 | } |
---|
804 | } |
---|
805 | } |
---|
806 | |
---|
807 | #if !defined(__CFA_NO_STATISTICS__) |
---|
808 | if(this->print_halts) { |
---|
809 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->unique_id, rdtscl()); |
---|
810 | } |
---|
811 | #endif |
---|
812 | #else |
---|
813 | #if !defined(CFA_HAVE_IORING_OP_READ) |
---|
814 | #error this is only implemented if the read is present |
---|
815 | #endif |
---|
816 | // Do we already have a pending read |
---|
817 | if(available(future)) { |
---|
818 | // There is no pending read, we need to add one |
---|
819 | reset(future); |
---|
820 | |
---|
821 | __kernel_read(this, future, (char *)&val, this->idle_fd ); |
---|
822 | } |
---|
823 | |
---|
824 | __cfa_io_flush( this, 1 ); |
---|
825 | #endif |
---|
826 | } |
---|
827 | |
---|
828 | static bool mark_idle(__cluster_proc_list & this, processor & proc) { |
---|
829 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
830 | if(!try_lock( this )) return false; |
---|
831 | this.idle++; |
---|
832 | /* paranoid */ verify( this.idle <= this.total ); |
---|
833 | remove(proc); |
---|
834 | insert_first(this.idles, proc); |
---|
835 | |
---|
836 | __atomic_store_n(&this.fd, proc.idle_fd, __ATOMIC_SEQ_CST); |
---|
837 | unlock( this ); |
---|
838 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
839 | |
---|
840 | return true; |
---|
841 | } |
---|
842 | |
---|
843 | static void mark_awake(__cluster_proc_list & this, processor & proc) { |
---|
844 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
845 | lock( this ); |
---|
846 | this.idle--; |
---|
847 | /* paranoid */ verify( this.idle >= 0 ); |
---|
848 | remove(proc); |
---|
849 | insert_last(this.actives, proc); |
---|
850 | |
---|
851 | { |
---|
852 | int fd = 0; |
---|
853 | if(!this.idles`isEmpty) fd = this.idles`first.idle_fd; |
---|
854 | __atomic_store_n(&this.fd, fd, __ATOMIC_SEQ_CST); |
---|
855 | } |
---|
856 | |
---|
857 | unlock( this ); |
---|
858 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
859 | } |
---|
860 | |
---|
861 | //============================================================================================= |
---|
862 | // Unexpected Terminating logic |
---|
863 | //============================================================================================= |
---|
864 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
865 | thread$ * thrd = __cfaabi_tls.this_thread; |
---|
866 | |
---|
867 | if(thrd) { |
---|
868 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
869 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
870 | |
---|
871 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
872 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
873 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
874 | } |
---|
875 | else { |
---|
876 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
877 | } |
---|
878 | } |
---|
879 | else { |
---|
880 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
881 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
882 | } |
---|
883 | } |
---|
884 | |
---|
885 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
886 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
887 | } |
---|
888 | |
---|
889 | static __spinlock_t kernel_debug_lock; |
---|
890 | |
---|
891 | extern "C" { |
---|
892 | void __cfaabi_bits_acquire() { |
---|
893 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
894 | } |
---|
895 | |
---|
896 | void __cfaabi_bits_release() { |
---|
897 | unlock( kernel_debug_lock ); |
---|
898 | } |
---|
899 | } |
---|
900 | |
---|
901 | //============================================================================================= |
---|
902 | // Kernel Utilities |
---|
903 | //============================================================================================= |
---|
904 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
905 | #include "io/types.hfa" |
---|
906 | #endif |
---|
907 | |
---|
908 | static inline bool __maybe_io_drain( processor * proc ) { |
---|
909 | bool ret = false; |
---|
910 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
911 | __cfadbg_print_safe(runtime_core, "Kernel : core %p checking io for ring %d\n", proc, proc->io.ctx->fd); |
---|
912 | |
---|
913 | // Check if we should drain the queue |
---|
914 | $io_context * ctx = proc->io.ctx; |
---|
915 | unsigned head = *ctx->cq.head; |
---|
916 | unsigned tail = *ctx->cq.tail; |
---|
917 | if(head == tail) return false; |
---|
918 | #if OLD_MAIN |
---|
919 | ready_schedule_lock(); |
---|
920 | ret = __cfa_io_drain( proc ); |
---|
921 | ready_schedule_unlock(); |
---|
922 | #else |
---|
923 | ret = __cfa_io_drain( proc ); |
---|
924 | #endif |
---|
925 | #endif |
---|
926 | return ret; |
---|
927 | } |
---|
928 | |
---|
929 | //----------------------------------------------------------------------------- |
---|
930 | // Debug |
---|
931 | __cfaabi_dbg_debug_do( |
---|
932 | extern "C" { |
---|
933 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
---|
934 | this.prev_name = prev_name; |
---|
935 | this.prev_thrd = kernelTLS().this_thread; |
---|
936 | } |
---|
937 | } |
---|
938 | ) |
---|
939 | |
---|
940 | //----------------------------------------------------------------------------- |
---|
941 | // Debug |
---|
942 | bool threading_enabled(void) __attribute__((const)) { |
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943 | return true; |
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944 | } |
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945 | |
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946 | //----------------------------------------------------------------------------- |
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947 | // Statistics |
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948 | #if !defined(__CFA_NO_STATISTICS__) |
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949 | void print_halts( processor & this ) { |
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950 | this.print_halts = true; |
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951 | } |
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952 | |
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953 | static void crawl_list( cluster * cltr, dlist(processor) & list, unsigned count ) { |
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954 | /* paranoid */ verify( cltr->stats ); |
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955 | |
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956 | processor * it = &list`first; |
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957 | for(unsigned i = 0; i < count; i++) { |
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958 | /* paranoid */ verifyf( it, "Unexpected null iterator, at index %u of %u\n", i, count); |
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959 | /* paranoid */ verify( it->local_data->this_stats ); |
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960 | // __print_stats( it->local_data->this_stats, cltr->print_stats, "Processor", it->name, (void*)it ); |
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961 | __tally_stats( cltr->stats, it->local_data->this_stats ); |
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962 | it = &(*it)`next; |
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963 | } |
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964 | } |
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965 | |
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966 | void crawl_cluster_stats( cluster & this ) { |
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967 | // Stop the world, otherwise stats could get really messed-up |
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968 | // this doesn't solve all problems but does solve many |
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969 | // so it's probably good enough |
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970 | disable_interrupts(); |
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971 | uint_fast32_t last_size = ready_mutate_lock(); |
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972 | |
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973 | crawl_list(&this, this.procs.actives, this.procs.total - this.procs.idle); |
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974 | crawl_list(&this, this.procs.idles , this.procs.idle ); |
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975 | |
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976 | // Unlock the RWlock |
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977 | ready_mutate_unlock( last_size ); |
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978 | enable_interrupts(); |
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979 | } |
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980 | |
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981 | |
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982 | void print_stats_now( cluster & this, int flags ) { |
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983 | crawl_cluster_stats( this ); |
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984 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
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985 | } |
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986 | #endif |
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987 | // Local Variables: // |
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988 | // mode: c // |
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989 | // tab-width: 4 // |
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990 | // End: // |
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