1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2020 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/startup.cfa -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Thu Jul 30 15:12:54 2020 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : |
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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 | // C Includes |
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20 | #include <errno.h> // errno |
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21 | #include <signal.h> |
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22 | #include <string.h> // strerror |
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23 | #include <unistd.h> // sysconf |
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24 | |
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25 | extern "C" { |
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26 | #include <limits.h> // PTHREAD_STACK_MIN |
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27 | #include <unistd.h> // syscall |
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28 | #include <sys/eventfd.h> // eventfd |
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29 | #include <sys/mman.h> // mprotect |
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30 | #include <sys/resource.h> // getrlimit |
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31 | } |
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32 | |
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33 | // CFA Includes |
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34 | #include "kernel/private.hfa" |
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35 | #include "iofwd.hfa" |
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36 | #include "startup.hfa" // STARTUP_PRIORITY_XXX |
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37 | #include "limits.hfa" |
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38 | #include "math.hfa" |
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39 | |
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40 | #define CFA_PROCESSOR_USE_MMAP 0 |
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41 | |
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42 | //----------------------------------------------------------------------------- |
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43 | // Some assembly required |
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44 | #if defined( __i386 ) |
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45 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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46 | "movl %%esp,%0\n" \ |
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47 | "movl %%ebp,%1\n" \ |
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48 | : "=rm" (ctx.SP), \ |
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49 | "=rm" (ctx.FP) \ |
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50 | ) |
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51 | #elif defined( __x86_64 ) |
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52 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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53 | "movq %%rsp,%0\n" \ |
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54 | "movq %%rbp,%1\n" \ |
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55 | : "=rm" (ctx.SP), \ |
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56 | "=rm" (ctx.FP) \ |
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57 | ) |
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58 | #elif defined( __aarch64__ ) |
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59 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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60 | "mov %0, sp\n" \ |
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61 | "mov %1, fp\n" \ |
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62 | : "=rm" (ctx.SP), \ |
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63 | "=rm" (ctx.FP) \ |
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64 | ) |
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65 | #else |
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66 | #error unknown hardware architecture |
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67 | #endif |
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68 | |
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69 | //----------------------------------------------------------------------------- |
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70 | // Start and stop routine for the kernel, declared first to make sure they run first |
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71 | static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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72 | static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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73 | |
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74 | //----------------------------------------------------------------------------- |
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75 | // Static Forward Declarations |
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76 | struct current_stack_info_t; |
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77 | |
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78 | static void * __invoke_processor(void * arg); |
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79 | static void __kernel_first_resume( processor * this ); |
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80 | static void __kernel_last_resume ( processor * this ); |
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81 | static void init(processor & this, const char name[], cluster & _cltr, thread$ * initT); |
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82 | static void deinit(processor & this); |
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83 | static void doregister( struct cluster & cltr ); |
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84 | static void unregister( struct cluster & cltr ); |
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85 | static void register_tls( processor * this ); |
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86 | static void unregister_tls( processor * this ); |
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87 | static void ?{}( coroutine$ & this, current_stack_info_t * info); |
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88 | static void ?{}( thread$ & this, current_stack_info_t * info); |
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89 | static void ?{}(processorCtx_t & this) {} |
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90 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info); |
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91 | |
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92 | #if defined(__CFA_WITH_VERIFY__) |
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93 | static bool verify_fwd_bck_rng(void); |
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94 | #endif |
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95 | |
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96 | //----------------------------------------------------------------------------- |
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97 | // Forward Declarations for other modules |
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98 | extern void __kernel_alarm_startup(void); |
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99 | extern void __kernel_alarm_shutdown(void); |
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100 | extern void __cfa_io_start( processor * ); |
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101 | extern void __cfa_io_stop ( processor * ); |
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102 | |
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103 | //----------------------------------------------------------------------------- |
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104 | // Other Forward Declarations |
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105 | extern void __wake_proc(processor *); |
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106 | extern int cfa_main_returned; // from interpose.cfa |
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107 | uint32_t __global_random_prime = 4_294_967_291u, __global_random_mask = false; |
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108 | |
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109 | //----------------------------------------------------------------------------- |
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110 | // Kernel storage |
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111 | KERNEL_STORAGE(cluster, mainCluster); |
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112 | KERNEL_STORAGE(processor, mainProcessor); |
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113 | KERNEL_STORAGE(thread$, mainThread); |
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114 | KERNEL_STORAGE(__stack_t, mainThreadCtx); |
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115 | // KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock); |
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116 | KERNEL_STORAGE(eventfd_t, mainIdleEventFd); |
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117 | KERNEL_STORAGE(io_future_t, mainIdleFuture); |
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118 | #if !defined(__CFA_NO_STATISTICS__) |
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119 | KERNEL_STORAGE(__stats_t, mainProcStats); |
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120 | #endif |
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121 | |
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122 | cluster * mainCluster libcfa_public; |
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123 | processor * mainProcessor; |
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124 | thread$ * mainThread; |
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125 | |
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126 | extern "C" { |
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127 | struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters; |
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128 | } |
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129 | |
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130 | extern size_t __page_size; |
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131 | extern int __map_prot; |
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132 | |
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133 | //----------------------------------------------------------------------------- |
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134 | // Global state |
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135 | __thread struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= { |
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136 | NULL, // cannot use 0p |
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137 | NULL, |
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138 | false, |
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139 | { 1, false, false }, |
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140 | 0, |
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141 | { 0, 0 }, |
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142 | NULL, |
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143 | #ifdef __CFA_WITH_VERIFY__ |
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144 | false, |
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145 | 0, |
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146 | #endif |
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147 | }; |
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148 | |
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149 | __scheduler_RWLock_t __scheduler_lock @= { 0 }; |
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150 | |
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151 | #if defined(CFA_HAVE_LINUX_LIBRSEQ) |
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152 | // No data needed |
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153 | #elif defined(CFA_HAVE_LINUX_RSEQ_H) |
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154 | extern "Cforall" { |
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155 | __attribute__((aligned(64))) __thread volatile struct rseq __cfaabi_rseq @= { |
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156 | .cpu_id : RSEQ_CPU_ID_UNINITIALIZED, |
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157 | }; |
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158 | } |
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159 | #else |
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160 | // No data needed |
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161 | #endif |
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162 | |
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163 | //----------------------------------------------------------------------------- |
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164 | // Struct to steal stack |
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165 | struct current_stack_info_t { |
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166 | __stack_t * storage; // pointer to stack object |
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167 | void * base; // base of stack |
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168 | void * limit; // stack grows towards stack limit |
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169 | void * context; // address of cfa_context_t |
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170 | }; |
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171 | |
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172 | static void ?{}( current_stack_info_t & this ) { |
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173 | __stack_context_t ctx; |
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174 | CtxGet( ctx ); |
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175 | this.base = ctx.FP; |
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176 | |
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177 | rlimit r; |
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178 | getrlimit( RLIMIT_STACK, &r); |
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179 | size_t size = r.rlim_cur; |
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180 | |
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181 | this.limit = (void *)(((intptr_t)this.base) - size); |
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182 | this.context = &storage_mainThreadCtx; |
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183 | } |
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184 | |
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185 | |
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186 | //============================================================================================= |
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187 | // Kernel Setup logic |
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188 | //============================================================================================= |
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189 | //----------------------------------------------------------------------------- |
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190 | // Kernel boot procedures |
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191 | static void __kernel_startup(void) { |
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192 | /* paranoid */ verify( ! __preemption_enabled() ); |
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193 | __cfadbg_print_safe(runtime_core, "Kernel : Starting\n"); |
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194 | |
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195 | __cfa_dbg_global_clusters.list{ __get }; |
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196 | __cfa_dbg_global_clusters.lock{}; |
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197 | |
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198 | /* paranoid */ verify( verify_fwd_bck_rng() ); |
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199 | |
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200 | // Initialize the global scheduler lock |
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201 | // __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock; |
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202 | (__scheduler_lock){}; |
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203 | |
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204 | // Initialize the main cluster |
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205 | mainCluster = (cluster *)&storage_mainCluster; |
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206 | (*mainCluster){"Main Cluster", 0}; |
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207 | |
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208 | __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n"); |
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209 | |
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210 | // Construct the processor context of the main processor |
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211 | void ?{}(processorCtx_t & this, processor * proc) { |
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212 | (this.self){ "Processor" }; |
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213 | this.self.starter = 0p; |
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214 | this.proc = proc; |
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215 | } |
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216 | |
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217 | void ?{}(processor & this) with( this ) { |
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218 | ( this.terminated ){}; |
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219 | ( this.runner ){}; |
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220 | init( this, "Main Processor", *mainCluster, 0p ); |
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221 | kernel_thread = pthread_self(); |
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222 | |
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223 | runner{ &this }; |
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224 | __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner); |
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225 | } |
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226 | |
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227 | // Initialize the main processor and the main processor ctx |
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228 | // (the coroutine that contains the processing control flow) |
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229 | mainProcessor = (processor *)&storage_mainProcessor; |
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230 | (*mainProcessor){}; |
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231 | |
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232 | mainProcessor->idle_wctx.rdbuf = &storage_mainIdleEventFd; |
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233 | mainProcessor->idle_wctx.ftr = (io_future_t*)&storage_mainIdleFuture; |
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234 | /* paranoid */ verify( sizeof(storage_mainIdleEventFd) == sizeof(eventfd_t) ); |
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235 | |
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236 | __cfa_io_start( mainProcessor ); |
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237 | register_tls( mainProcessor ); |
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238 | |
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239 | // Start by initializing the main thread |
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240 | // SKULLDUGGERY: the mainThread steals the process main thread |
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241 | // which will then be scheduled by the mainProcessor normally |
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242 | mainThread = (thread$ *)&storage_mainThread; |
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243 | current_stack_info_t info; |
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244 | info.storage = (__stack_t*)&storage_mainThreadCtx; |
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245 | (*mainThread){ &info }; |
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246 | |
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247 | __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n"); |
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248 | |
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249 | //initialize the global state variables |
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250 | __cfaabi_tls.this_processor = mainProcessor; |
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251 | __cfaabi_tls.this_thread = mainThread; |
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252 | |
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253 | #if !defined( __CFA_NO_STATISTICS__ ) |
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254 | __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats; |
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255 | __init_stats( __cfaabi_tls.this_stats ); |
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256 | #endif |
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257 | mainProcessor->local_data = &__cfaabi_tls; |
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258 | |
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259 | // Enable preemption |
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260 | __kernel_alarm_startup(); |
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261 | |
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262 | // Add the main thread to the ready queue |
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263 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
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264 | schedule_thread$(mainThread, UNPARK_LOCAL); |
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265 | |
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266 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
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267 | // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that |
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268 | // mainThread is on the ready queue when this call is made. |
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269 | __kernel_first_resume( __cfaabi_tls.this_processor ); |
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270 | |
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271 | |
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272 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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273 | |
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274 | __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n"); |
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275 | |
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276 | /* paranoid */ verify( ! __preemption_enabled() ); |
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277 | enable_interrupts(); |
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278 | /* paranoid */ verify( __preemption_enabled() ); |
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279 | |
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280 | } |
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281 | |
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282 | static void __kernel_shutdown(void) { |
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283 | if(!cfa_main_returned) return; |
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284 | /* paranoid */ verify( __preemption_enabled() ); |
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285 | disable_interrupts(); |
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286 | /* paranoid */ verify( ! __preemption_enabled() ); |
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287 | |
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288 | __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n"); |
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289 | |
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290 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
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291 | // When its coroutine terminates, it return control to the mainThread |
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292 | // which is currently here |
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293 | /* paranoid */ verify( !__atomic_load_n(&mainProcessor->do_terminate, __ATOMIC_ACQUIRE) ); |
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294 | __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE); |
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295 | __wake_proc( mainProcessor ); |
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296 | __kernel_last_resume( __cfaabi_tls.this_processor ); |
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297 | mainThread->self_cor.state = Halted; |
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298 | |
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299 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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300 | |
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301 | // Disable preemption |
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302 | __kernel_alarm_shutdown(); |
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303 | |
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304 | #if !defined( __CFA_NO_STATISTICS__ ) |
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305 | __stats_t * st = (__stats_t *)& storage_mainProcStats; |
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306 | __tally_stats(mainCluster->stats, st); |
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307 | if( 0 != mainProcessor->print_stats ) { |
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308 | __print_stats( st, mainProcessor->print_stats, "Processor ", mainProcessor->name, (void*)mainProcessor ); |
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309 | } |
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310 | #if defined(CFA_STATS_ARRAY) |
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311 | __flush_stat( st, "Processor", mainProcessor ); |
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312 | #endif |
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313 | #endif |
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314 | |
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315 | mainProcessor->local_data = 0p; |
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316 | |
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317 | unregister_tls( mainProcessor ); |
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318 | __cfa_io_stop( mainProcessor ); |
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319 | |
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320 | // Destroy the main processor and its context in reverse order of construction |
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321 | // These were manually constructed so we need manually destroy them |
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322 | void ^?{}(processor & this) with( this ){ |
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323 | deinit( this ); |
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324 | |
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325 | /* paranoid */ verify( this.do_terminate == true ); |
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326 | __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner); |
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327 | } |
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328 | |
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329 | ^(*mainProcessor){}; |
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330 | |
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331 | // Final step, destroy the main thread since it is no longer needed |
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332 | |
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333 | // Since we provided a stack to this taxk it will not destroy anything |
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334 | /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1)); |
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335 | ^(*mainThread){}; |
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336 | |
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337 | ^(*mainCluster){}; |
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338 | |
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339 | ^(__scheduler_lock){}; |
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340 | |
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341 | ^(__cfa_dbg_global_clusters.list){}; |
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342 | ^(__cfa_dbg_global_clusters.lock){}; |
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343 | |
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344 | __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n"); |
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345 | } |
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346 | |
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347 | //============================================================================================= |
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348 | // Kernel Initial Scheduling logic |
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349 | //============================================================================================= |
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350 | |
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351 | // Context invoker for processors |
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352 | // This is the entry point for processors (kernel threads) *except* for the main processor |
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353 | // It effectively constructs a coroutine by stealing the pthread stack |
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354 | static void * __invoke_processor(void * arg) { |
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355 | #if !defined( __CFA_NO_STATISTICS__ ) |
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356 | __stats_t local_stats; |
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357 | __init_stats( &local_stats ); |
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358 | __cfaabi_tls.this_stats = &local_stats; |
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359 | #endif |
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360 | |
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361 | processor * proc = (processor *) arg; |
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362 | __cfaabi_tls.this_processor = proc; |
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363 | __cfaabi_tls.this_thread = 0p; |
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364 | __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1]; |
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365 | proc->local_data = &__cfaabi_tls; |
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366 | |
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367 | __cfa_io_start( proc ); |
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368 | register_tls( proc ); |
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369 | |
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370 | // used for idle sleep when io_uring is present |
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371 | io_future_t future; |
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372 | eventfd_t idle_buf; |
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373 | proc->idle_wctx.ftr = &future; |
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374 | proc->idle_wctx.rdbuf = &idle_buf; |
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375 | |
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376 | |
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377 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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378 | // which is needed for the 2-step context switch. However, there is no reason |
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379 | // to waste the perfectly valid stack create by pthread. |
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380 | current_stack_info_t info; |
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381 | __stack_t ctx; |
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382 | info.storage = &ctx; |
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383 | (proc->runner){ proc, &info }; |
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384 | |
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385 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage); |
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386 | |
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387 | //Set global state |
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388 | __cfaabi_tls.this_thread = 0p; |
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389 | |
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390 | //We now have a proper context from which to schedule threads |
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391 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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392 | |
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393 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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394 | // resume it to start it like it normally would, it will just context switch |
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395 | // back to here. Instead directly call the main since we already are on the |
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396 | // appropriate stack. |
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397 | get_coroutine(proc->runner)->state = Active; |
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398 | main( proc->runner ); |
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399 | get_coroutine(proc->runner)->state = Halted; |
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400 | |
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401 | // Main routine of the core returned, the core is now fully terminated |
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402 | __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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403 | |
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404 | #if !defined(__CFA_NO_STATISTICS__) |
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405 | __tally_stats(proc->cltr->stats, &local_stats); |
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406 | if( 0 != proc->print_stats ) { |
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407 | __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc ); |
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408 | } |
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409 | #if defined(CFA_STATS_ARRAY) |
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410 | __flush_stat( &local_stats, "Processor", proc ); |
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411 | #endif |
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412 | #endif |
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413 | |
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414 | proc->local_data = 0p; |
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415 | |
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416 | unregister_tls( proc ); |
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417 | __cfa_io_stop( proc ); |
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418 | |
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419 | return 0p; |
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420 | } |
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421 | |
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422 | static void __kernel_first_resume( processor * this ) { |
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423 | thread$ * src = mainThread; |
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424 | coroutine$ * dst = get_coroutine(this->runner); |
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425 | |
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426 | /* paranoid */ verify( ! __preemption_enabled() ); |
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427 | |
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428 | __cfaabi_tls.this_thread->curr_cor = dst; |
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429 | __stack_prepare( &dst->stack, DEFAULT_STACK_SIZE ); |
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430 | __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine); |
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431 | |
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432 | /* paranoid */ verify( ! __preemption_enabled() ); |
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433 | |
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434 | dst->last = &src->self_cor; |
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435 | dst->starter = dst->starter ? dst->starter : &src->self_cor; |
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436 | |
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437 | // make sure the current state is still correct |
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438 | /* paranoid */ verify(src->state == Ready); |
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439 | src->corctx_flag = true; |
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440 | |
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441 | // context switch to specified coroutine |
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442 | verify( dst->context.SP ); |
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443 | __cfactx_switch( &src->context, &dst->context ); |
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444 | // when __cfactx_switch returns we are back in the src coroutine |
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445 | |
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446 | mainThread->curr_cor = &mainThread->self_cor; |
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447 | |
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448 | // make sure the current state has been update |
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449 | /* paranoid */ verify(src->state == Active); |
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450 | |
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451 | /* paranoid */ verify( ! __preemption_enabled() ); |
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452 | } |
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453 | |
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454 | // KERNEL_ONLY |
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455 | static void __kernel_last_resume( processor * this ) { |
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456 | coroutine$ * src = &mainThread->self_cor; |
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457 | coroutine$ * dst = get_coroutine(this->runner); |
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458 | |
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459 | /* paranoid */ verify( ! __preemption_enabled() ); |
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460 | /* paranoid */ verify( dst->starter == src ); |
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461 | /* paranoid */ verify( dst->context.SP ); |
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462 | |
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463 | // SKULLDUGGERY in debug the processors check that the |
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464 | // stack is still within the limit of the stack limits after running a thread. |
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465 | // that check doesn't make sense if we context switch to the processor using the |
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466 | // coroutine semantics. Since this is a special case, use the current context |
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467 | // info to populate these fields. |
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468 | __cfaabi_dbg_debug_do( |
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469 | __stack_context_t ctx; |
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470 | CtxGet( ctx ); |
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471 | mainThread->context.SP = ctx.SP; |
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472 | mainThread->context.FP = ctx.FP; |
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473 | ) |
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474 | |
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475 | // context switch to the processor |
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476 | __cfactx_switch( &src->context, &dst->context ); |
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477 | } |
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478 | |
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479 | |
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480 | //============================================================================================= |
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481 | // Kernel Object Constructors logic |
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482 | //============================================================================================= |
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483 | //----------------------------------------------------------------------------- |
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484 | // Main thread construction |
---|
485 | static void ?{}( coroutine$ & this, current_stack_info_t * info) with( this ) { |
---|
486 | stack.storage = info->storage; |
---|
487 | with(*stack.storage) { |
---|
488 | limit = info->limit; |
---|
489 | base = info->base; |
---|
490 | } |
---|
491 | __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage; |
---|
492 | *istorage |= 0x1; |
---|
493 | name = "Main Thread"; |
---|
494 | state = Start; |
---|
495 | starter = 0p; |
---|
496 | last = 0p; |
---|
497 | cancellation = 0p; |
---|
498 | } |
---|
499 | |
---|
500 | static void ?{}( thread$ & this, current_stack_info_t * info) with( this ) { |
---|
501 | ticket = TICKET_RUNNING; |
---|
502 | state = Start; |
---|
503 | self_cor{ info }; |
---|
504 | curr_cor = &self_cor; |
---|
505 | curr_cluster = mainCluster; |
---|
506 | self_mon.owner = &this; |
---|
507 | self_mon.recursion = 1; |
---|
508 | self_mon_p = &self_mon; |
---|
509 | link.next = 0p; |
---|
510 | link.ts = MAX; |
---|
511 | preferred = ready_queue_new_preferred(); |
---|
512 | last_proc = 0p; |
---|
513 | random_state = __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl(); |
---|
514 | #if defined( __CFA_WITH_VERIFY__ ) |
---|
515 | canary = 0x0D15EA5E0D15EA5Ep; |
---|
516 | #endif |
---|
517 | |
---|
518 | node.next = 0p; |
---|
519 | node.prev = 0p; |
---|
520 | doregister(curr_cluster, this); |
---|
521 | |
---|
522 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
---|
523 | } |
---|
524 | |
---|
525 | //----------------------------------------------------------------------------- |
---|
526 | // Processor |
---|
527 | // Construct the processor context of non-main processors |
---|
528 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
---|
529 | (this.self){ info }; |
---|
530 | this.proc = proc; |
---|
531 | } |
---|
532 | |
---|
533 | static void init(processor & this, const char name[], cluster & _cltr, thread$ * initT) with( this ) { |
---|
534 | this.name = name; |
---|
535 | this.cltr = &_cltr; |
---|
536 | this.rdq.its = 0; |
---|
537 | this.rdq.itr = 0; |
---|
538 | this.rdq.id = 0; |
---|
539 | this.rdq.target = MAX; |
---|
540 | this.rdq.last = MAX; |
---|
541 | this.rdq.cpu = 0; |
---|
542 | // this.rdq.cutoff = 0ull; |
---|
543 | do_terminate = false; |
---|
544 | preemption_alarm = 0p; |
---|
545 | pending_preemption = false; |
---|
546 | |
---|
547 | this.io.ctx = 0p; |
---|
548 | this.io.pending = false; |
---|
549 | this.io.dirty = false; |
---|
550 | |
---|
551 | this.init.thrd = initT; |
---|
552 | |
---|
553 | this.local_data = 0p; |
---|
554 | |
---|
555 | idle_wctx.evfd = eventfd(0, 0); |
---|
556 | if (idle_wctx.evfd < 0) { |
---|
557 | abort("KERNEL ERROR: PROCESSOR EVENTFD - %s\n", strerror(errno)); |
---|
558 | } |
---|
559 | |
---|
560 | idle_wctx.sem = 0; |
---|
561 | idle_wctx.wake__time = 0; |
---|
562 | |
---|
563 | // I'm assuming these two are reserved for standard input and output |
---|
564 | // so I'm using them as sentinels with idle_wctx. |
---|
565 | /* paranoid */ verify( idle_wctx.evfd != 0 ); |
---|
566 | /* paranoid */ verify( idle_wctx.evfd != 1 ); |
---|
567 | |
---|
568 | #if !defined(__CFA_NO_STATISTICS__) |
---|
569 | print_stats = 0; |
---|
570 | print_halts = false; |
---|
571 | #endif |
---|
572 | |
---|
573 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this); |
---|
574 | } |
---|
575 | |
---|
576 | // Not a ctor, it just preps the destruction but should not destroy members |
---|
577 | static void deinit(processor & this) { |
---|
578 | close(this.idle_wctx.evfd); |
---|
579 | } |
---|
580 | |
---|
581 | void ?{}(processor & this, const char name[], cluster & _cltr, thread$ * initT) libcfa_public { |
---|
582 | ( this.terminated ){}; |
---|
583 | ( this.runner ){}; |
---|
584 | |
---|
585 | disable_interrupts(); |
---|
586 | init( this, name, _cltr, initT ); |
---|
587 | enable_interrupts(); |
---|
588 | |
---|
589 | __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this); |
---|
590 | |
---|
591 | this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this ); |
---|
592 | } |
---|
593 | |
---|
594 | void ?{}(processor & this, const char name[], cluster & _cltr) libcfa_public { |
---|
595 | (this){name, _cltr, 0p}; |
---|
596 | } |
---|
597 | |
---|
598 | extern size_t __page_size; |
---|
599 | void ^?{}(processor & this) libcfa_public with( this ) { |
---|
600 | /* paranoid */ verify( !__atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ); |
---|
601 | __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this); |
---|
602 | |
---|
603 | __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED); |
---|
604 | __disable_interrupts_checked(); |
---|
605 | __wake_proc( &this ); |
---|
606 | __enable_interrupts_checked(); |
---|
607 | |
---|
608 | wait( terminated ); |
---|
609 | /* paranoid */ verify( active_processor() != &this); |
---|
610 | |
---|
611 | __destroy_pthread( kernel_thread, this.stack, 0p ); |
---|
612 | |
---|
613 | disable_interrupts(); |
---|
614 | deinit( this ); |
---|
615 | enable_interrupts(); |
---|
616 | } |
---|
617 | |
---|
618 | //----------------------------------------------------------------------------- |
---|
619 | // Cluster |
---|
620 | static void ?{}(__cluster_proc_list & this) { |
---|
621 | this.fdw = 0p; |
---|
622 | this.idle = 0; |
---|
623 | this.total = 0; |
---|
624 | } |
---|
625 | |
---|
626 | void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) libcfa_public with( this ) { |
---|
627 | this.name = name; |
---|
628 | this.preemption_rate = preemption_rate; |
---|
629 | this.sched.readyQ.data = 0p; |
---|
630 | this.sched.readyQ.tscs = 0p; |
---|
631 | this.sched.readyQ.count = 0; |
---|
632 | this.sched.io.tscs = 0p; |
---|
633 | this.sched.io.data = 0p; |
---|
634 | this.sched.caches = 0p; |
---|
635 | |
---|
636 | #if !defined(__CFA_NO_STATISTICS__) |
---|
637 | print_stats = 0; |
---|
638 | stats = alloc(); |
---|
639 | __init_stats( stats ); |
---|
640 | #endif |
---|
641 | |
---|
642 | threads{ __get }; |
---|
643 | |
---|
644 | io.arbiter = create(); |
---|
645 | io.params = io_params; |
---|
646 | |
---|
647 | doregister(this); |
---|
648 | |
---|
649 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
650 | disable_interrupts(); |
---|
651 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
652 | |
---|
653 | // Adjust the ready queue size |
---|
654 | ready_queue_grow( &this ); |
---|
655 | |
---|
656 | // Unlock the RWlock |
---|
657 | ready_mutate_unlock( last_size ); |
---|
658 | enable_interrupts( false ); // Don't poll, could be in main cluster |
---|
659 | } |
---|
660 | |
---|
661 | void ^?{}(cluster & this) libcfa_public { |
---|
662 | destroy(this.io.arbiter); |
---|
663 | |
---|
664 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
665 | disable_interrupts(); |
---|
666 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
667 | |
---|
668 | // Adjust the ready queue size |
---|
669 | ready_queue_shrink( &this ); |
---|
670 | |
---|
671 | // Unlock the RWlock |
---|
672 | ready_mutate_unlock( last_size ); |
---|
673 | |
---|
674 | ready_queue_close( &this ); |
---|
675 | /* paranoid */ verify( this.sched.readyQ.data == 0p ); |
---|
676 | /* paranoid */ verify( this.sched.readyQ.tscs == 0p ); |
---|
677 | /* paranoid */ verify( this.sched.readyQ.count == 0 ); |
---|
678 | /* paranoid */ verify( this.sched.io.tscs == 0p ); |
---|
679 | /* paranoid */ verify( this.sched.caches == 0p ); |
---|
680 | |
---|
681 | enable_interrupts( false ); // Don't poll, could be in main cluster |
---|
682 | |
---|
683 | |
---|
684 | #if !defined(__CFA_NO_STATISTICS__) |
---|
685 | if( 0 != this.print_stats ) { |
---|
686 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
---|
687 | } |
---|
688 | #if defined(CFA_STATS_ARRAY) |
---|
689 | __flush_stat( this.stats, "Cluster", &this ); |
---|
690 | #endif |
---|
691 | free( this.stats ); |
---|
692 | #endif |
---|
693 | |
---|
694 | unregister(this); |
---|
695 | } |
---|
696 | |
---|
697 | //============================================================================================= |
---|
698 | // Miscellaneous Initialization |
---|
699 | //============================================================================================= |
---|
700 | //----------------------------------------------------------------------------- |
---|
701 | // Global Queues |
---|
702 | static void doregister( cluster & cltr ) { |
---|
703 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
704 | push_front( __cfa_dbg_global_clusters.list, cltr ); |
---|
705 | unlock ( __cfa_dbg_global_clusters.lock ); |
---|
706 | } |
---|
707 | |
---|
708 | static void unregister( cluster & cltr ) { |
---|
709 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
710 | remove( __cfa_dbg_global_clusters.list, cltr ); |
---|
711 | unlock( __cfa_dbg_global_clusters.lock ); |
---|
712 | } |
---|
713 | |
---|
714 | void doregister( cluster * cltr, thread$ & thrd ) { |
---|
715 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
716 | cltr->nthreads += 1; |
---|
717 | push_front(cltr->threads, thrd); |
---|
718 | unlock (cltr->thread_list_lock); |
---|
719 | } |
---|
720 | |
---|
721 | void unregister( cluster * cltr, thread$ & thrd ) { |
---|
722 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
723 | remove(cltr->threads, thrd ); |
---|
724 | cltr->nthreads -= 1; |
---|
725 | unlock(cltr->thread_list_lock); |
---|
726 | } |
---|
727 | |
---|
728 | static void register_tls( processor * this ) { |
---|
729 | // Register and Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
730 | uint_fast32_t last_size; |
---|
731 | [this->unique_id, last_size] = ready_mutate_register(); |
---|
732 | |
---|
733 | this->rdq.cpu = __kernel_getcpu(); |
---|
734 | |
---|
735 | this->cltr->procs.total += 1u; |
---|
736 | insert_last(this->cltr->procs.actives, *this); |
---|
737 | |
---|
738 | // Adjust the ready queue size |
---|
739 | ready_queue_grow( this->cltr ); |
---|
740 | |
---|
741 | // Unlock the RWlock |
---|
742 | ready_mutate_unlock( last_size ); |
---|
743 | } |
---|
744 | |
---|
745 | |
---|
746 | static void unregister_tls( processor * this ) { |
---|
747 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
748 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
749 | this->cltr->procs.total -= 1u; |
---|
750 | remove(*this); |
---|
751 | |
---|
752 | // clear the cluster so nothing gets pushed to local queues |
---|
753 | cluster * cltr = this->cltr; |
---|
754 | this->cltr = 0p; |
---|
755 | |
---|
756 | // Adjust the ready queue size |
---|
757 | ready_queue_shrink( cltr ); |
---|
758 | |
---|
759 | // Unlock the RWlock and unregister: we don't need the read_lock any more |
---|
760 | ready_mutate_unregister( this->unique_id, last_size ); |
---|
761 | } |
---|
762 | |
---|
763 | static void check( int ret, const char func[] ) { |
---|
764 | if ( ret ) { // pthread routines return errno values |
---|
765 | abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) ); |
---|
766 | } // if |
---|
767 | } // Abort |
---|
768 | |
---|
769 | void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) { |
---|
770 | pthread_attr_t attr; |
---|
771 | |
---|
772 | check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
773 | |
---|
774 | size_t stacksize = max( PTHREAD_STACK_MIN, DEFAULT_STACK_SIZE ); |
---|
775 | |
---|
776 | void * stack; |
---|
777 | #if CFA_PROCESSOR_USE_MMAP |
---|
778 | stacksize = ceiling( stacksize, __page_size ) + __page_size; |
---|
779 | stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); |
---|
780 | if(stack == ((void*)-1)) { |
---|
781 | abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
782 | } |
---|
783 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
784 | abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
785 | } // if |
---|
786 | #else |
---|
787 | __cfaabi_dbg_debug_do( |
---|
788 | stack = memalign( __page_size, stacksize + __page_size ); |
---|
789 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
790 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
791 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
792 | } // if |
---|
793 | ); |
---|
794 | __cfaabi_dbg_no_debug_do( |
---|
795 | stack = malloc( stacksize ); |
---|
796 | ); |
---|
797 | #endif |
---|
798 | |
---|
799 | check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" ); |
---|
800 | check( pthread_create( pthread, &attr, start, arg ), "pthread_create" ); |
---|
801 | return stack; |
---|
802 | } |
---|
803 | |
---|
804 | void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) { |
---|
805 | int err = pthread_join( pthread, retval ); |
---|
806 | if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err)); |
---|
807 | |
---|
808 | #if CFA_PROCESSOR_USE_MMAP |
---|
809 | pthread_attr_t attr; |
---|
810 | |
---|
811 | check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
812 | |
---|
813 | size_t stacksize; |
---|
814 | // default stack size, normally defined by shell limit |
---|
815 | check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" ); |
---|
816 | assert( stacksize >= PTHREAD_STACK_MIN ); |
---|
817 | stacksize += __page_size; |
---|
818 | |
---|
819 | if(munmap(stack, stacksize) == -1) { |
---|
820 | abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
821 | } |
---|
822 | #else |
---|
823 | __cfaabi_dbg_debug_do( |
---|
824 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
825 | if ( mprotect( stack, __page_size, __map_prot ) == -1 ) { |
---|
826 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
827 | } // if |
---|
828 | ); |
---|
829 | free( stack ); |
---|
830 | #endif |
---|
831 | } |
---|
832 | |
---|
833 | #if defined(__CFA_WITH_VERIFY__) |
---|
834 | static bool verify_fwd_bck_rng(void) { |
---|
835 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng); |
---|
836 | |
---|
837 | unsigned values[10]; |
---|
838 | for(i; 10) { |
---|
839 | values[i] = __tls_rand_fwd(); |
---|
840 | } |
---|
841 | |
---|
842 | __tls_rand_advance_bck(); |
---|
843 | |
---|
844 | for ( i; 9 -~= 0 ) { |
---|
845 | if(values[i] != __tls_rand_bck()) { |
---|
846 | return false; |
---|
847 | } |
---|
848 | } |
---|
849 | |
---|
850 | return true; |
---|
851 | } |
---|
852 | #endif |
---|