[8118303] | 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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[75f3522] | 10 | // Created On : Tue Jan 17 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[0190480] | 12 | // Last Modified On : Mon Aug 31 07:08:20 2020 |
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| 13 | // Update Count : 71 |
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[8118303] | 14 | // |
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| 15 | |
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[2026bb6] | 16 | #define __cforall_thread__ |
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[4069faad] | 17 | // #define __CFA_DEBUG_PRINT_RUNTIME_CORE__ |
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[2026bb6] | 18 | |
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[8118303] | 19 | //C Includes |
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[214e8da] | 20 | #include <errno.h> |
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[9d944b2] | 21 | #include <stdio.h> |
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[58b6d1b] | 22 | #include <signal.h> |
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[9d944b2] | 23 | #include <unistd.h> |
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[dddb3dd0] | 24 | extern "C" { |
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| 25 | #include <sys/eventfd.h> |
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| 26 | } |
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[8118303] | 27 | |
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| 28 | //CFA Includes |
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[73abe95] | 29 | #include "kernel_private.hfa" |
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| 30 | #include "preemption.hfa" |
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[8118303] | 31 | |
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| 32 | //Private includes |
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| 33 | #define __CFA_INVOKE_PRIVATE__ |
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| 34 | #include "invoke.h" |
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| 35 | |
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[4069faad] | 36 | |
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[deca0f5] | 37 | //----------------------------------------------------------------------------- |
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| 38 | // Some assembly required |
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[1805b1b] | 39 | #if defined( __i386 ) |
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[deca0f5] | 40 | // mxcr : SSE Status and Control bits (control bits are preserved across function calls) |
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| 41 | // fcw : X87 FPU control word (preserved across function calls) |
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| 42 | #define __x87_store \ |
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| 43 | uint32_t __mxcr; \ |
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| 44 | uint16_t __fcw; \ |
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| 45 | __asm__ volatile ( \ |
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| 46 | "stmxcsr %0\n" \ |
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| 47 | "fnstcw %1\n" \ |
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| 48 | : "=m" (__mxcr),\ |
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| 49 | "=m" (__fcw) \ |
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| 50 | ) |
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| 51 | |
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| 52 | #define __x87_load \ |
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| 53 | __asm__ volatile ( \ |
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| 54 | "fldcw %1\n" \ |
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| 55 | "ldmxcsr %0\n" \ |
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| 56 | ::"m" (__mxcr),\ |
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| 57 | "m" (__fcw) \ |
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| 58 | ) |
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| 59 | |
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| 60 | #elif defined( __x86_64 ) |
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| 61 | #define __x87_store \ |
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| 62 | uint32_t __mxcr; \ |
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| 63 | uint16_t __fcw; \ |
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| 64 | __asm__ volatile ( \ |
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| 65 | "stmxcsr %0\n" \ |
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| 66 | "fnstcw %1\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 | #define __x87_load \ |
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| 72 | __asm__ volatile ( \ |
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| 73 | "fldcw %1\n" \ |
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| 74 | "ldmxcsr %0\n" \ |
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| 75 | :: "m" (__mxcr),\ |
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| 76 | "m" (__fcw) \ |
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| 77 | ) |
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| 78 | |
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[0190480] | 79 | #elif defined( __arm__ ) |
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| 80 | #define __x87_store |
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| 81 | #define __x87_load |
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| 82 | |
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| 83 | #elif defined( __aarch64__ ) |
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[74f5c83] | 84 | #define __x87_store \ |
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| 85 | uint32_t __fpcntl[2]; \ |
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| 86 | __asm__ volatile ( \ |
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| 87 | "mrs x9, FPCR\n" \ |
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| 88 | "mrs x10, FPSR\n" \ |
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| 89 | "stp x9, x10, %0\n" \ |
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| 90 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 91 | ) |
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| 92 | |
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| 93 | #define __x87_load \ |
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| 94 | __asm__ volatile ( \ |
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| 95 | "ldp x9, x10, %0\n" \ |
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| 96 | "msr FPSR, x10\n" \ |
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| 97 | "msr FPCR, x9\n" \ |
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| 98 | : "=m" (__fpcntl) : : "x9", "x10" \ |
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| 99 | ) |
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| 100 | |
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[deca0f5] | 101 | #else |
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[0190480] | 102 | #error unsupported hardware architecture |
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[deca0f5] | 103 | #endif |
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| 104 | |
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[e660761] | 105 | extern $thread * mainThread; |
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| 106 | extern processor * mainProcessor; |
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[2ac095d] | 107 | |
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[92e7631] | 108 | //----------------------------------------------------------------------------- |
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| 109 | // Kernel Scheduling logic |
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| 110 | static $thread * __next_thread(cluster * this); |
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[1eb239e4] | 111 | static $thread * __next_thread_slow(cluster * this); |
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[92e7631] | 112 | static void __run_thread(processor * this, $thread * dst); |
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[e873838] | 113 | static void __wake_one(cluster * cltr); |
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[1eb239e4] | 114 | |
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| 115 | static void push (__cluster_idles & idles, processor & proc); |
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| 116 | static void remove(__cluster_idles & idles, processor & proc); |
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| 117 | static [unsigned idle, unsigned total, * processor] query( & __cluster_idles idles ); |
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| 118 | |
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[dddb3dd0] | 119 | extern void __cfa_io_start( processor * ); |
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| 120 | extern void __cfa_io_drain( processor * ); |
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| 121 | extern void __cfa_io_flush( processor * ); |
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| 122 | extern void __cfa_io_stop ( processor * ); |
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| 123 | static inline void __maybe_io_drain( processor * ); |
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| 124 | |
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| 125 | extern void __disable_interrupts_hard(); |
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| 126 | extern void __enable_interrupts_hard(); |
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[c84e80a] | 127 | |
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[75f3522] | 128 | //============================================================================================= |
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| 129 | // Kernel Scheduling logic |
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| 130 | //============================================================================================= |
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[8fcbb4c] | 131 | //Main of the processor contexts |
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[83a071f9] | 132 | void main(processorCtx_t & runner) { |
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[21184e3] | 133 | // Because of a bug, we couldn't initialized the seed on construction |
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| 134 | // Do it here |
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[8fc652e0] | 135 | __cfaabi_tls.rand_seed ^= rdtscl(); |
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| 136 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner); |
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[f2384c9a] | 137 | __tls_rand_advance_bck(); |
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[21184e3] | 138 | |
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[83a071f9] | 139 | processor * this = runner.proc; |
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[094476d] | 140 | verify(this); |
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[c81ebf9] | 141 | |
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[dddb3dd0] | 142 | __cfa_io_start( this ); |
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| 143 | |
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[4069faad] | 144 | __cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this); |
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[28d73c1] | 145 | #if !defined(__CFA_NO_STATISTICS__) |
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| 146 | if( this->print_halts ) { |
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| 147 | __cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->id, this->name, (void*)this); |
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| 148 | } |
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| 149 | #endif |
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[b798713] | 150 | |
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[75f3522] | 151 | { |
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[c81ebf9] | 152 | // Setup preemption data |
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| 153 | preemption_scope scope = { this }; |
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| 154 | |
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[325e6ea] | 155 | #if !defined(__CFA_NO_STATISTICS__) |
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| 156 | unsigned long long last_tally = rdtscl(); |
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| 157 | #endif |
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| 158 | |
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[a5e7233] | 159 | // if we need to run some special setup, now is the time to do it. |
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| 160 | if(this->init.thrd) { |
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| 161 | this->init.thrd->curr_cluster = this->cltr; |
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| 162 | __run_thread(this, this->init.thrd); |
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| 163 | } |
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[325e6ea] | 164 | |
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[4069faad] | 165 | __cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this); |
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[8118303] | 166 | |
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[ac2b598] | 167 | $thread * readyThread = 0p; |
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[1eb239e4] | 168 | MAIN_LOOP: |
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| 169 | for() { |
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[dddb3dd0] | 170 | // Check if there is pending io |
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| 171 | __maybe_io_drain( this ); |
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| 172 | |
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[92e7631] | 173 | // Try to get the next thread |
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[8c50aed] | 174 | readyThread = __next_thread( this->cltr ); |
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[75f3522] | 175 | |
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[1eb239e4] | 176 | if( !readyThread ) { |
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[dddb3dd0] | 177 | __cfa_io_flush( this ); |
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[1eb239e4] | 178 | readyThread = __next_thread_slow( this->cltr ); |
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| 179 | } |
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[4e6fb8e] | 180 | |
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[1eb239e4] | 181 | HALT: |
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| 182 | if( !readyThread ) { |
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| 183 | // Don't block if we are done |
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| 184 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[c81ebf9] | 185 | |
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[1eb239e4] | 186 | #if !defined(__CFA_NO_STATISTICS__) |
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| 187 | __tls_stats()->ready.sleep.halts++; |
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| 188 | #endif |
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[398e8e9] | 189 | |
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[1eb239e4] | 190 | // Push self to idle stack |
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| 191 | push(this->cltr->idles, * this); |
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[398e8e9] | 192 | |
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[1eb239e4] | 193 | // Confirm the ready-queue is empty |
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| 194 | readyThread = __next_thread_slow( this->cltr ); |
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| 195 | if( readyThread ) { |
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| 196 | // A thread was found, cancel the halt |
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| 197 | remove(this->cltr->idles, * this); |
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| 198 | |
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| 199 | #if !defined(__CFA_NO_STATISTICS__) |
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| 200 | __tls_stats()->ready.sleep.cancels++; |
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| 201 | #endif |
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| 202 | |
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| 203 | // continue the mai loop |
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| 204 | break HALT; |
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| 205 | } |
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| 206 | |
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| 207 | #if !defined(__CFA_NO_STATISTICS__) |
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| 208 | if(this->print_halts) { |
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| 209 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->id, rdtscl()); |
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| 210 | } |
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| 211 | #endif |
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| 212 | |
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[dddb3dd0] | 213 | __cfadbg_print_safe(runtime_core, "Kernel : core %p waiting on eventfd %d\n", this, this->idle); |
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| 214 | |
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| 215 | __disable_interrupts_hard(); |
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| 216 | eventfd_t val; |
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| 217 | eventfd_read( this->idle, &val ); |
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| 218 | __enable_interrupts_hard(); |
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[1eb239e4] | 219 | |
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| 220 | #if !defined(__CFA_NO_STATISTICS__) |
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| 221 | if(this->print_halts) { |
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| 222 | __cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->id, rdtscl()); |
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| 223 | } |
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| 224 | #endif |
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| 225 | |
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| 226 | // We were woken up, remove self from idle |
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| 227 | remove(this->cltr->idles, * this); |
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| 228 | |
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| 229 | // DON'T just proceed, start looking again |
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| 230 | continue MAIN_LOOP; |
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[64a7146] | 231 | } |
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[1eb239e4] | 232 | |
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| 233 | /* paranoid */ verify( readyThread ); |
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| 234 | |
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[dddb3dd0] | 235 | // Reset io dirty bit |
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| 236 | this->io.dirty = false; |
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| 237 | |
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[1eb239e4] | 238 | // We found a thread run it |
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| 239 | __run_thread(this, readyThread); |
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| 240 | |
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| 241 | // Are we done? |
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| 242 | if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP; |
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[325e6ea] | 243 | |
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| 244 | #if !defined(__CFA_NO_STATISTICS__) |
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| 245 | unsigned long long curr = rdtscl(); |
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| 246 | if(curr > (last_tally + 500000000)) { |
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| 247 | __tally_stats(this->cltr->stats, __cfaabi_tls.this_stats); |
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| 248 | last_tally = curr; |
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| 249 | } |
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| 250 | #endif |
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[dddb3dd0] | 251 | |
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| 252 | if(this->io.pending && !this->io.dirty) { |
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| 253 | __cfa_io_flush( this ); |
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| 254 | } |
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[c81ebf9] | 255 | } |
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| 256 | |
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[4069faad] | 257 | __cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this); |
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[c84e80a] | 258 | } |
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[8118303] | 259 | |
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[dddb3dd0] | 260 | __cfa_io_stop( this ); |
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| 261 | |
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[454f478] | 262 | post( this->terminated ); |
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[bdeba0b] | 263 | |
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[dddb3dd0] | 264 | |
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[28d73c1] | 265 | if(this == mainProcessor) { |
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[6a490b2] | 266 | // HACK : the coroutine context switch expects this_thread to be set |
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| 267 | // and it make sense for it to be set in all other cases except here |
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| 268 | // fake it |
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[8fc652e0] | 269 | __cfaabi_tls.this_thread = mainThread; |
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[6a490b2] | 270 | } |
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[7768b8d] | 271 | |
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[4069faad] | 272 | __cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this); |
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[c84e80a] | 273 | } |
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| 274 | |
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[5c1a531] | 275 | static int * __volatile_errno() __attribute__((noinline)); |
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| 276 | static int * __volatile_errno() { asm(""); return &errno; } |
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| 277 | |
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[14a61b5] | 278 | // KERNEL ONLY |
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[1c273d0] | 279 | // runThread runs a thread by context switching |
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| 280 | // from the processor coroutine to the target thread |
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[ac2b598] | 281 | static void __run_thread(processor * this, $thread * thrd_dst) { |
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[8fc652e0] | 282 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[1eb239e4] | 283 | /* 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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| 284 | /* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next ); |
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| 285 | __builtin_prefetch( thrd_dst->context.SP ); |
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| 286 | |
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[dddb3dd0] | 287 | __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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| 288 | |
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[ac2b598] | 289 | $coroutine * proc_cor = get_coroutine(this->runner); |
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[8fcbb4c] | 290 | |
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[9f575ea] | 291 | // set state of processor coroutine to inactive |
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| 292 | verify(proc_cor->state == Active); |
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[ae7be7a] | 293 | proc_cor->state = Blocked; |
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[e8e457e] | 294 | |
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[9f575ea] | 295 | // Actually run the thread |
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[3381ed7] | 296 | RUNNING: while(true) { |
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[ff79d5e] | 297 | thrd_dst->preempted = __NO_PREEMPTION; |
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| 298 | thrd_dst->state = Active; |
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[e8e457e] | 299 | |
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[58d64a4] | 300 | // Update global state |
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[8fc652e0] | 301 | kernelTLS().this_thread = thrd_dst; |
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[75f3522] | 302 | |
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[8fc652e0] | 303 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 304 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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[9d6e1b8a] | 305 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[b4b63e8] | 306 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[5afb49a] | 307 | /* paranoid */ verify( thrd_dst->state != Halted ); |
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[210b8b3] | 308 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) || thrd_dst->curr_cor == proc_cor, "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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| 309 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) || thrd_dst->curr_cor == proc_cor, "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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[ac12f1f] | 310 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[b4b63e8] | 311 | |
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[3381ed7] | 312 | |
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[58d64a4] | 313 | |
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[9f575ea] | 314 | // set context switch to the thread that the processor is executing |
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[c7a900a] | 315 | __cfactx_switch( &proc_cor->context, &thrd_dst->context ); |
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| 316 | // when __cfactx_switch returns we are back in the processor coroutine |
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[9f575ea] | 317 | |
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[ac12f1f] | 318 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary ); |
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[210b8b3] | 319 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); |
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| 320 | /* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); |
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[b4b63e8] | 321 | /* paranoid */ verify( thrd_dst->context.SP ); |
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[9d6e1b8a] | 322 | /* paranoid */ verify( thrd_dst->curr_cluster == this->cltr ); |
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[8fc652e0] | 323 | /* paranoid */ verify( kernelTLS().this_thread == thrd_dst ); |
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| 324 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[75f3522] | 325 | |
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[58d64a4] | 326 | // Reset global state |
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[8fc652e0] | 327 | kernelTLS().this_thread = 0p; |
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[3381ed7] | 328 | |
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| 329 | // We just finished running a thread, there are a few things that could have happened. |
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| 330 | // 1 - Regular case : the thread has blocked and now one has scheduled it yet. |
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| 331 | // 2 - Racy case : the thread has blocked but someone has already tried to schedule it. |
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| 332 | // 4 - Preempted |
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| 333 | // In case 1, we may have won a race so we can't write to the state again. |
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| 334 | // In case 2, we lost the race so we now own the thread. |
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| 335 | |
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| 336 | if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) { |
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| 337 | // The thread was preempted, reschedule it and reset the flag |
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[e873838] | 338 | __schedule_thread( thrd_dst ); |
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[3381ed7] | 339 | break RUNNING; |
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| 340 | } |
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[75f3522] | 341 | |
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[3ea8ad1] | 342 | if(unlikely(thrd_dst->state == Halting)) { |
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[ff79d5e] | 343 | // The thread has halted, it should never be scheduled/run again |
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[5afb49a] | 344 | // finish the thread |
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| 345 | __thread_finish( thrd_dst ); |
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[ff79d5e] | 346 | break RUNNING; |
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| 347 | } |
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| 348 | |
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| 349 | /* paranoid */ verify( thrd_dst->state == Active ); |
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| 350 | thrd_dst->state = Blocked; |
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| 351 | |
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[3381ed7] | 352 | // set state of processor coroutine to active and the thread to inactive |
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[ff79d5e] | 353 | int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST); |
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| 354 | switch(old_ticket) { |
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[6a77224] | 355 | case TICKET_RUNNING: |
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[3381ed7] | 356 | // This is case 1, the regular case, nothing more is needed |
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| 357 | break RUNNING; |
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[6a77224] | 358 | case TICKET_UNBLOCK: |
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[ec43cf9] | 359 | #if !defined(__CFA_NO_STATISTICS__) |
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| 360 | __tls_stats()->ready.threads.threads++; |
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| 361 | #endif |
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[3381ed7] | 362 | // This is case 2, the racy case, someone tried to run this thread before it finished blocking |
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| 363 | // In this case, just run it again. |
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| 364 | continue RUNNING; |
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| 365 | default: |
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| 366 | // This makes no sense, something is wrong abort |
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[ff79d5e] | 367 | abort(); |
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[3381ed7] | 368 | } |
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[9f575ea] | 369 | } |
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[e8e457e] | 370 | |
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[9f575ea] | 371 | // Just before returning to the processor, set the processor coroutine to active |
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[e8e457e] | 372 | proc_cor->state = Active; |
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[1eb239e4] | 373 | |
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[dddb3dd0] | 374 | __cfadbg_print_safe(runtime_core, "Kernel : core %p finished running thread %p\n", this, thrd_dst); |
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| 375 | |
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[ec43cf9] | 376 | #if !defined(__CFA_NO_STATISTICS__) |
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| 377 | __tls_stats()->ready.threads.threads--; |
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| 378 | #endif |
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| 379 | |
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[8fc652e0] | 380 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[82c948c] | 381 | } |
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| 382 | |
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[14a61b5] | 383 | // KERNEL_ONLY |
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[b0c7419] | 384 | void returnToKernel() { |
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[8fc652e0] | 385 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 386 | $coroutine * proc_cor = get_coroutine(kernelTLS().this_processor->runner); |
---|
| 387 | $thread * thrd_src = kernelTLS().this_thread; |
---|
[e8e457e] | 388 | |
---|
[29cb302] | 389 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[8fc652e0] | 390 | struct processor * last_proc = kernelTLS().this_processor; |
---|
[29cb302] | 391 | #endif |
---|
| 392 | |
---|
[9f575ea] | 393 | // Run the thread on this processor |
---|
| 394 | { |
---|
| 395 | int local_errno = *__volatile_errno(); |
---|
| 396 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 397 | __x87_store; |
---|
| 398 | #endif |
---|
[b4b63e8] | 399 | /* paranoid */ verify( proc_cor->context.SP ); |
---|
[ac12f1f] | 400 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[c7a900a] | 401 | __cfactx_switch( &thrd_src->context, &proc_cor->context ); |
---|
[ac12f1f] | 402 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary ); |
---|
[9f575ea] | 403 | #if defined( __i386 ) || defined( __x86_64 ) |
---|
| 404 | __x87_load; |
---|
| 405 | #endif |
---|
| 406 | *__volatile_errno() = local_errno; |
---|
[8fcbb4c] | 407 | } |
---|
[deca0f5] | 408 | |
---|
[29cb302] | 409 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[8fc652e0] | 410 | if(last_proc != kernelTLS().this_processor) { |
---|
[29cb302] | 411 | __tls_stats()->ready.threads.migration++; |
---|
| 412 | } |
---|
| 413 | #endif |
---|
| 414 | |
---|
[8fc652e0] | 415 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[210b8b3] | 416 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too small.\n", thrd_src ); |
---|
| 417 | /* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too large.\n", thrd_src ); |
---|
[c84e80a] | 418 | } |
---|
| 419 | |
---|
[8def349] | 420 | //----------------------------------------------------------------------------- |
---|
| 421 | // Scheduler routines |
---|
[14a61b5] | 422 | // KERNEL ONLY |
---|
[e873838] | 423 | void __schedule_thread( $thread * thrd ) { |
---|
[8fc652e0] | 424 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[9d6e1b8a] | 425 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
[6a490b2] | 426 | /* paranoid */ verify( thrd ); |
---|
| 427 | /* paranoid */ verify( thrd->state != Halted ); |
---|
[9d6e1b8a] | 428 | /* paranoid */ verify( thrd->curr_cluster ); |
---|
[3381ed7] | 429 | /* paranoid */ #if defined( __CFA_WITH_VERIFY__ ) |
---|
[504a7dc] | 430 | /* paranoid */ if( thrd->state == Blocked || thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION, |
---|
| 431 | "Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[ff79d5e] | 432 | /* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active, |
---|
[504a7dc] | 433 | "Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted ); |
---|
[3381ed7] | 434 | /* paranoid */ #endif |
---|
[6a490b2] | 435 | /* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next ); |
---|
[ac12f1f] | 436 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
[b4b63e8] | 437 | |
---|
[9f575ea] | 438 | |
---|
[ae7be7a] | 439 | if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready; |
---|
[6b4cdd3] | 440 | |
---|
[ec43cf9] | 441 | // Dereference the thread now because once we push it, there is not guaranteed it's still valid. |
---|
| 442 | struct cluster * cl = thrd->curr_cluster; |
---|
[32a8b61] | 443 | |
---|
[ec43cf9] | 444 | ready_schedule_lock(); |
---|
[32a8b61] | 445 | // push the thread to the cluster ready-queue |
---|
| 446 | push( cl, thrd ); |
---|
| 447 | |
---|
| 448 | // variable thrd is no longer safe to use |
---|
| 449 | |
---|
| 450 | // wake the cluster using the save variable. |
---|
| 451 | __wake_one( cl ); |
---|
[e873838] | 452 | ready_schedule_unlock(); |
---|
[1c273d0] | 453 | |
---|
[ec43cf9] | 454 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 455 | if( kernelTLS().this_stats ) { |
---|
| 456 | __tls_stats()->ready.threads.threads++; |
---|
| 457 | } |
---|
| 458 | else { |
---|
| 459 | __atomic_fetch_add(&cl->stats->ready.threads.threads, 1, __ATOMIC_RELAXED); |
---|
| 460 | } |
---|
| 461 | #endif |
---|
| 462 | |
---|
[8fc652e0] | 463 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[db6f06a] | 464 | } |
---|
| 465 | |
---|
[14a61b5] | 466 | // KERNEL ONLY |
---|
[1eb239e4] | 467 | static inline $thread * __next_thread(cluster * this) with( *this ) { |
---|
[8fc652e0] | 468 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 469 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
[7768b8d] | 470 | |
---|
[e873838] | 471 | ready_schedule_lock(); |
---|
[1eb239e4] | 472 | $thread * thrd = pop( this ); |
---|
[e873838] | 473 | ready_schedule_unlock(); |
---|
[7768b8d] | 474 | |
---|
[8fc652e0] | 475 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
| 476 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 477 | return thrd; |
---|
[eb2e723] | 478 | } |
---|
| 479 | |
---|
[64a7146] | 480 | // KERNEL ONLY |
---|
[1eb239e4] | 481 | static inline $thread * __next_thread_slow(cluster * this) with( *this ) { |
---|
[8fc652e0] | 482 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 483 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
[64a7146] | 484 | |
---|
[e873838] | 485 | ready_schedule_lock(); |
---|
[1eb239e4] | 486 | $thread * thrd = pop_slow( this ); |
---|
[e873838] | 487 | ready_schedule_unlock(); |
---|
[64a7146] | 488 | |
---|
[8fc652e0] | 489 | /* paranoid */ verify( kernelTLS().this_proc_id ); |
---|
| 490 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 491 | return thrd; |
---|
[64a7146] | 492 | } |
---|
| 493 | |
---|
[e873838] | 494 | void unpark( $thread * thrd ) { |
---|
| 495 | if( !thrd ) return; |
---|
| 496 | |
---|
[ff79d5e] | 497 | int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST); |
---|
| 498 | switch(old_ticket) { |
---|
[6a77224] | 499 | case TICKET_RUNNING: |
---|
[3381ed7] | 500 | // Wake won the race, the thread will reschedule/rerun itself |
---|
| 501 | break; |
---|
[6a77224] | 502 | case TICKET_BLOCKED: |
---|
[3381ed7] | 503 | /* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION ); |
---|
[ff79d5e] | 504 | /* paranoid */ verify( thrd->state == Blocked ); |
---|
[0b33412] | 505 | |
---|
[8fc652e0] | 506 | { |
---|
| 507 | /* paranoid */ verify( publicTLS_get(this_proc_id) ); |
---|
[5cb51502] | 508 | disable_interrupts(); |
---|
[8fc652e0] | 509 | |
---|
| 510 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 511 | |
---|
| 512 | // Wake lost the race, |
---|
| 513 | __schedule_thread( thrd ); |
---|
| 514 | |
---|
| 515 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 516 | |
---|
[5cb51502] | 517 | enable_interrupts_noPoll(); |
---|
[8fc652e0] | 518 | /* paranoid */ verify( publicTLS_get(this_proc_id) ); |
---|
| 519 | } |
---|
| 520 | |
---|
[3381ed7] | 521 | break; |
---|
| 522 | default: |
---|
| 523 | // This makes no sense, something is wrong abort |
---|
[7ee8153] | 524 | abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name); |
---|
[de6319f] | 525 | } |
---|
[eb2e723] | 526 | } |
---|
| 527 | |
---|
[e235429] | 528 | void park( void ) { |
---|
[8fc652e0] | 529 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[82ff5845] | 530 | disable_interrupts(); |
---|
[8fc652e0] | 531 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 532 | /* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION ); |
---|
[0b33412] | 533 | |
---|
[82c948c] | 534 | returnToKernel(); |
---|
[0b33412] | 535 | |
---|
[8fc652e0] | 536 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[36982fc] | 537 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[8fc652e0] | 538 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[0c78741] | 539 | |
---|
| 540 | } |
---|
[09800e9] | 541 | |
---|
[5afb49a] | 542 | extern "C" { |
---|
| 543 | // Leave the thread monitor |
---|
| 544 | // last routine called by a thread. |
---|
| 545 | // Should never return |
---|
| 546 | void __cfactx_thrd_leave() { |
---|
[8fc652e0] | 547 | $thread * thrd = active_thread(); |
---|
[5afb49a] | 548 | $monitor * this = &thrd->self_mon; |
---|
| 549 | |
---|
| 550 | // Lock the monitor now |
---|
| 551 | lock( this->lock __cfaabi_dbg_ctx2 ); |
---|
| 552 | |
---|
| 553 | disable_interrupts(); |
---|
| 554 | |
---|
[9d6e1b8a] | 555 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
| 556 | /* paranoid */ verify( thrd->state == Active ); |
---|
| 557 | /* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary ); |
---|
| 558 | /* paranoid */ verify( kernelTLS().this_thread == thrd ); |
---|
| 559 | /* paranoid */ verify( thrd->context.SP ); |
---|
| 560 | /* 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 ); |
---|
| 561 | /* 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 ); |
---|
| 562 | |
---|
[3ea8ad1] | 563 | thrd->state = Halting; |
---|
[58688bf] | 564 | if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); } |
---|
[9d6e1b8a] | 565 | if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); } |
---|
| 566 | if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); } |
---|
[5afb49a] | 567 | |
---|
| 568 | // Leave the thread |
---|
| 569 | returnToKernel(); |
---|
| 570 | |
---|
| 571 | // Control flow should never reach here! |
---|
[9d6e1b8a] | 572 | abort(); |
---|
[5afb49a] | 573 | } |
---|
[09800e9] | 574 | } |
---|
| 575 | |
---|
[14a61b5] | 576 | // KERNEL ONLY |
---|
[3381ed7] | 577 | bool force_yield( __Preemption_Reason reason ) { |
---|
[8fc652e0] | 578 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[09800e9] | 579 | disable_interrupts(); |
---|
[8fc652e0] | 580 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[09800e9] | 581 | |
---|
[8fc652e0] | 582 | $thread * thrd = kernelTLS().this_thread; |
---|
[ff79d5e] | 583 | /* paranoid */ verify(thrd->state == Active); |
---|
[3381ed7] | 584 | |
---|
| 585 | // SKULLDUGGERY: It is possible that we are preempting this thread just before |
---|
| 586 | // it was going to park itself. If that is the case and it is already using the |
---|
| 587 | // intrusive fields then we can't use them to preempt the thread |
---|
| 588 | // If that is the case, abandon the preemption. |
---|
| 589 | bool preempted = false; |
---|
[504a7dc] | 590 | if(thrd->link.next == 0p) { |
---|
[3381ed7] | 591 | preempted = true; |
---|
| 592 | thrd->preempted = reason; |
---|
| 593 | returnToKernel(); |
---|
[de6319f] | 594 | } |
---|
[f2b12406] | 595 | |
---|
[8fc652e0] | 596 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[3381ed7] | 597 | enable_interrupts_noPoll(); |
---|
[8fc652e0] | 598 | /* paranoid */ verify( __preemption_enabled() ); |
---|
[f2b12406] | 599 | |
---|
[3381ed7] | 600 | return preempted; |
---|
[f2b12406] | 601 | } |
---|
| 602 | |
---|
[14a61b5] | 603 | //============================================================================================= |
---|
[92e7631] | 604 | // Kernel Idle Sleep |
---|
[14a61b5] | 605 | //============================================================================================= |
---|
[64a7146] | 606 | // Wake a thread from the front if there are any |
---|
[e873838] | 607 | static void __wake_one(cluster * this) { |
---|
[8fc652e0] | 608 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[e873838] | 609 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[14a61b5] | 610 | |
---|
[64a7146] | 611 | // Check if there is a sleeping processor |
---|
[1eb239e4] | 612 | processor * p; |
---|
| 613 | unsigned idle; |
---|
| 614 | unsigned total; |
---|
| 615 | [idle, total, p] = query(this->idles); |
---|
[14a61b5] | 616 | |
---|
[64a7146] | 617 | // If no one is sleeping, we are done |
---|
[1eb239e4] | 618 | if( idle == 0 ) return; |
---|
[14a61b5] | 619 | |
---|
[64a7146] | 620 | // We found a processor, wake it up |
---|
[dddb3dd0] | 621 | eventfd_t val; |
---|
| 622 | val = 1; |
---|
| 623 | eventfd_write( p->idle, val ); |
---|
[14a61b5] | 624 | |
---|
[1eb239e4] | 625 | #if !defined(__CFA_NO_STATISTICS__) |
---|
[5cb51502] | 626 | if( kernelTLS().this_stats ) { |
---|
| 627 | __tls_stats()->ready.sleep.wakes++; |
---|
| 628 | } |
---|
| 629 | else { |
---|
| 630 | __atomic_fetch_add(&this->stats->ready.sleep.wakes, 1, __ATOMIC_RELAXED); |
---|
| 631 | } |
---|
[1eb239e4] | 632 | #endif |
---|
| 633 | |
---|
[e873838] | 634 | /* paranoid */ verify( ready_schedule_islocked() ); |
---|
[8fc652e0] | 635 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 636 | |
---|
| 637 | return; |
---|
[64a7146] | 638 | } |
---|
[14a61b5] | 639 | |
---|
[64a7146] | 640 | // Unconditionnaly wake a thread |
---|
[1eb239e4] | 641 | void __wake_proc(processor * this) { |
---|
[64a7146] | 642 | __cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this); |
---|
[14a61b5] | 643 | |
---|
[64a7146] | 644 | disable_interrupts(); |
---|
[8fc652e0] | 645 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[dddb3dd0] | 646 | eventfd_t val; |
---|
| 647 | val = 1; |
---|
[55d6affb] | 648 | eventfd_write( this->idle, val ); |
---|
[64a7146] | 649 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[92e7631] | 650 | } |
---|
| 651 | |
---|
[1eb239e4] | 652 | static void push (__cluster_idles & this, processor & proc) { |
---|
[8fc652e0] | 653 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 654 | lock( this ); |
---|
| 655 | this.idle++; |
---|
| 656 | /* paranoid */ verify( this.idle <= this.total ); |
---|
[8e16177] | 657 | |
---|
[1eb239e4] | 658 | insert_first(this.list, proc); |
---|
| 659 | unlock( this ); |
---|
[8fc652e0] | 660 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 661 | } |
---|
[8e16177] | 662 | |
---|
[1eb239e4] | 663 | static void remove(__cluster_idles & this, processor & proc) { |
---|
[8fc652e0] | 664 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 665 | lock( this ); |
---|
| 666 | this.idle--; |
---|
| 667 | /* paranoid */ verify( this.idle >= 0 ); |
---|
[c34ebf2] | 668 | |
---|
[1eb239e4] | 669 | remove(proc); |
---|
| 670 | unlock( this ); |
---|
[8fc652e0] | 671 | /* paranoid */ verify( ! __preemption_enabled() ); |
---|
[1eb239e4] | 672 | } |
---|
[c34ebf2] | 673 | |
---|
[1eb239e4] | 674 | static [unsigned idle, unsigned total, * processor] query( & __cluster_idles this ) { |
---|
| 675 | for() { |
---|
| 676 | uint64_t l = __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST); |
---|
| 677 | if( 1 == (l % 2) ) { Pause(); continue; } |
---|
| 678 | unsigned idle = this.idle; |
---|
| 679 | unsigned total = this.total; |
---|
| 680 | processor * proc = &this.list`first; |
---|
[7fdae38] | 681 | // Compiler fence is unnecessary, but gcc-8 and older incorrectly reorder code without it |
---|
| 682 | asm volatile("": : :"memory"); |
---|
[1eb239e4] | 683 | if(l != __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST)) { Pause(); continue; } |
---|
| 684 | return [idle, total, proc]; |
---|
| 685 | } |
---|
[6b4cdd3] | 686 | } |
---|
| 687 | |
---|
[dbe9b08] | 688 | //============================================================================================= |
---|
| 689 | // Unexpected Terminating logic |
---|
| 690 | //============================================================================================= |
---|
[92bfda0] | 691 | void __kernel_abort_msg( char * abort_text, int abort_text_size ) { |
---|
| 692 | $thread * thrd = __cfaabi_tls.this_thread; |
---|
[9d944b2] | 693 | |
---|
[de94a60] | 694 | if(thrd) { |
---|
| 695 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[1c40091] | 696 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 697 | |
---|
[212c2187] | 698 | if ( &thrd->self_cor != thrd->curr_cor ) { |
---|
| 699 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor ); |
---|
[1c40091] | 700 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[de94a60] | 701 | } |
---|
| 702 | else { |
---|
[1c40091] | 703 | __cfaabi_bits_write( STDERR_FILENO, ".\n", 2 ); |
---|
[de94a60] | 704 | } |
---|
[1c273d0] | 705 | } |
---|
[9d944b2] | 706 | else { |
---|
[de94a60] | 707 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[1c40091] | 708 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
---|
[9d944b2] | 709 | } |
---|
| 710 | } |
---|
| 711 | |
---|
[92bfda0] | 712 | int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 713 | return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 714 | } |
---|
| 715 | |
---|
[de94a60] | 716 | static __spinlock_t kernel_debug_lock; |
---|
| 717 | |
---|
[9d944b2] | 718 | extern "C" { |
---|
[1c40091] | 719 | void __cfaabi_bits_acquire() { |
---|
[36982fc] | 720 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 721 | } |
---|
| 722 | |
---|
[1c40091] | 723 | void __cfaabi_bits_release() { |
---|
[ea7d2b0] | 724 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 725 | } |
---|
[8118303] | 726 | } |
---|
| 727 | |
---|
[fa21ac9] | 728 | //============================================================================================= |
---|
| 729 | // Kernel Utilities |
---|
| 730 | //============================================================================================= |
---|
[dddb3dd0] | 731 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 732 | #include "io/types.hfa" |
---|
| 733 | #endif |
---|
| 734 | |
---|
| 735 | static inline void __maybe_io_drain( processor * proc ) { |
---|
| 736 | #if defined(CFA_HAVE_LINUX_IO_URING_H) |
---|
| 737 | __cfadbg_print_safe(runtime_core, "Kernel : core %p checking io for ring %d\n", proc, proc->io.ctx->fd); |
---|
| 738 | |
---|
| 739 | // Check if we should drain the queue |
---|
| 740 | $io_context * ctx = proc->io.ctx; |
---|
| 741 | unsigned head = *ctx->cq.head; |
---|
| 742 | unsigned tail = *ctx->cq.tail; |
---|
| 743 | if(head != tail) __cfa_io_drain( proc ); |
---|
| 744 | #endif |
---|
| 745 | } |
---|
| 746 | |
---|
[de94a60] | 747 | //----------------------------------------------------------------------------- |
---|
| 748 | // Debug |
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| 749 | __cfaabi_dbg_debug_do( |
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[1997b4e] | 750 | extern "C" { |
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[ae66348] | 751 | void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) { |
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[1997b4e] | 752 | this.prev_name = prev_name; |
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[8fc652e0] | 753 | this.prev_thrd = kernelTLS().this_thread; |
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[1997b4e] | 754 | } |
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[9181f1d] | 755 | } |
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[f7d6bb0] | 756 | ) |
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[2026bb6] | 757 | |
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| 758 | //----------------------------------------------------------------------------- |
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| 759 | // Debug |
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[8c50aed] | 760 | bool threading_enabled(void) __attribute__((const)) { |
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[2026bb6] | 761 | return true; |
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| 762 | } |
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[c34ebf2] | 763 | |
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| 764 | //----------------------------------------------------------------------------- |
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| 765 | // Statistics |
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| 766 | #if !defined(__CFA_NO_STATISTICS__) |
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| 767 | void print_halts( processor & this ) { |
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| 768 | this.print_halts = true; |
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| 769 | } |
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[58688bf] | 770 | |
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| 771 | void print_stats_now( cluster & this, int flags ) { |
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[1b033b8] | 772 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
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| 773 | } |
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[c34ebf2] | 774 | #endif |
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[8118303] | 775 | // Local Variables: // |
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| 776 | // mode: c // |
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| 777 | // tab-width: 4 // |
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| 778 | // End: // |
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