[e660761] | 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 | |
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| 18 | // C Includes |
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| 19 | #include <errno.h> // errno |
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| 20 | #include <string.h> // strerror |
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| 21 | #include <unistd.h> // sysconf |
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| 22 | extern "C" { |
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| 23 | #include <limits.h> // PTHREAD_STACK_MIN |
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[dddb3dd0] | 24 | #include <sys/eventfd.h> // eventfd |
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[e660761] | 25 | #include <sys/mman.h> // mprotect |
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| 26 | #include <sys/resource.h> // getrlimit |
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| 27 | } |
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| 28 | |
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| 29 | // CFA Includes |
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| 30 | #include "kernel_private.hfa" |
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| 31 | #include "startup.hfa" // STARTUP_PRIORITY_XXX |
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[bfcf6b9] | 32 | #include "math.hfa" |
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[e660761] | 33 | |
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[97229d6] | 34 | #define CFA_PROCESSOR_USE_MMAP 0 |
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| 35 | |
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[e660761] | 36 | //----------------------------------------------------------------------------- |
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| 37 | // Some assembly required |
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| 38 | #if defined( __i386 ) |
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[88cafe7] | 39 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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| 40 | "movl %%esp,%0\n" \ |
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| 41 | "movl %%ebp,%1\n" \ |
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| 42 | : "=rm" (ctx.SP), \ |
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| 43 | "=rm" (ctx.FP) \ |
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| 44 | ) |
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[e660761] | 45 | #elif defined( __x86_64 ) |
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[88cafe7] | 46 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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| 47 | "movq %%rsp,%0\n" \ |
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| 48 | "movq %%rbp,%1\n" \ |
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| 49 | : "=rm" (ctx.SP), \ |
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| 50 | "=rm" (ctx.FP) \ |
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| 51 | ) |
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| 52 | #elif defined( __aarch64__ ) |
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| 53 | #define CtxGet( ctx ) __asm__ volatile ( \ |
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| 54 | "mov %0, sp\n" \ |
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| 55 | "mov %1, fp\n" \ |
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| 56 | : "=rm" (ctx.SP), \ |
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| 57 | "=rm" (ctx.FP) \ |
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| 58 | ) |
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[e660761] | 59 | #else |
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| 60 | #error unknown hardware architecture |
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| 61 | #endif |
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| 62 | |
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| 63 | //----------------------------------------------------------------------------- |
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| 64 | // Start and stop routine for the kernel, declared first to make sure they run first |
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| 65 | static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 66 | static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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| 67 | |
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| 68 | //----------------------------------------------------------------------------- |
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| 69 | // Static Forward Declarations |
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| 70 | struct current_stack_info_t; |
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| 71 | |
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| 72 | static void * __invoke_processor(void * arg); |
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| 73 | static void __kernel_first_resume( processor * this ); |
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| 74 | static void __kernel_last_resume ( processor * this ); |
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[a5e7233] | 75 | static void init(processor & this, const char name[], cluster & _cltr, $thread * initT); |
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[e660761] | 76 | static void deinit(processor & this); |
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| 77 | static void doregister( struct cluster & cltr ); |
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| 78 | static void unregister( struct cluster & cltr ); |
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[c993b15] | 79 | static void register_tls( processor * this ); |
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| 80 | static void unregister_tls( processor * this ); |
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[e660761] | 81 | static void ?{}( $coroutine & this, current_stack_info_t * info); |
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| 82 | static void ?{}( $thread & this, current_stack_info_t * info); |
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| 83 | static void ?{}(processorCtx_t & this) {} |
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| 84 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info); |
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| 85 | |
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[f2384c9a] | 86 | #if defined(__CFA_WITH_VERIFY__) |
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| 87 | static bool verify_fwd_bck_rng(void); |
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| 88 | #endif |
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| 89 | |
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[e660761] | 90 | //----------------------------------------------------------------------------- |
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| 91 | // Forward Declarations for other modules |
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| 92 | extern void __kernel_alarm_startup(void); |
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| 93 | extern void __kernel_alarm_shutdown(void); |
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| 94 | |
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| 95 | //----------------------------------------------------------------------------- |
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| 96 | // Other Forward Declarations |
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[1eb239e4] | 97 | extern void __wake_proc(processor *); |
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[e660761] | 98 | |
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| 99 | //----------------------------------------------------------------------------- |
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| 100 | // Kernel storage |
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| 101 | KERNEL_STORAGE(cluster, mainCluster); |
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| 102 | KERNEL_STORAGE(processor, mainProcessor); |
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| 103 | KERNEL_STORAGE($thread, mainThread); |
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| 104 | KERNEL_STORAGE(__stack_t, mainThreadCtx); |
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| 105 | KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock); |
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| 106 | #if !defined(__CFA_NO_STATISTICS__) |
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| 107 | KERNEL_STORAGE(__stats_t, mainProcStats); |
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| 108 | #endif |
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| 109 | |
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| 110 | cluster * mainCluster; |
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| 111 | processor * mainProcessor; |
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| 112 | $thread * mainThread; |
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| 113 | __scheduler_RWLock_t * __scheduler_lock; |
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| 114 | |
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| 115 | extern "C" { |
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| 116 | struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters; |
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| 117 | } |
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| 118 | |
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[dd92fe9] | 119 | extern size_t __page_size; |
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[28c35e2] | 120 | extern int __map_prot; |
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[e660761] | 121 | |
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| 122 | //----------------------------------------------------------------------------- |
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| 123 | // Global state |
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[8fc652e0] | 124 | thread_local struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= { |
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[e660761] | 125 | NULL, // cannot use 0p |
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| 126 | NULL, |
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[c993b15] | 127 | false, |
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[e660761] | 128 | { 1, false, false }, |
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[c993b15] | 129 | 0, |
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| 130 | { 0, 0 }, |
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| 131 | NULL, |
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| 132 | #ifdef __CFA_WITH_VERIFY__ |
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| 133 | false, |
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| 134 | 0, |
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| 135 | #endif |
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[e660761] | 136 | }; |
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| 137 | |
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| 138 | //----------------------------------------------------------------------------- |
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| 139 | // Struct to steal stack |
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| 140 | struct current_stack_info_t { |
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| 141 | __stack_t * storage; // pointer to stack object |
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| 142 | void * base; // base of stack |
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| 143 | void * limit; // stack grows towards stack limit |
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| 144 | void * context; // address of cfa_context_t |
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| 145 | }; |
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| 146 | |
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| 147 | void ?{}( current_stack_info_t & this ) { |
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| 148 | __stack_context_t ctx; |
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| 149 | CtxGet( ctx ); |
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| 150 | this.base = ctx.FP; |
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| 151 | |
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| 152 | rlimit r; |
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| 153 | getrlimit( RLIMIT_STACK, &r); |
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| 154 | size_t size = r.rlim_cur; |
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| 155 | |
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| 156 | this.limit = (void *)(((intptr_t)this.base) - size); |
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| 157 | this.context = &storage_mainThreadCtx; |
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| 158 | } |
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| 159 | |
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| 160 | |
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| 161 | |
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| 162 | //============================================================================================= |
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| 163 | // Kernel Setup logic |
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| 164 | //============================================================================================= |
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| 165 | //----------------------------------------------------------------------------- |
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| 166 | // Kernel boot procedures |
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| 167 | static void __kernel_startup(void) { |
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[8fc652e0] | 168 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[e660761] | 169 | __cfadbg_print_safe(runtime_core, "Kernel : Starting\n"); |
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| 170 | |
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| 171 | __cfa_dbg_global_clusters.list{ __get }; |
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| 172 | __cfa_dbg_global_clusters.lock{}; |
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| 173 | |
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[f2384c9a] | 174 | /* paranoid */ verify( verify_fwd_bck_rng() ); |
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| 175 | |
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[e660761] | 176 | // Initialize the global scheduler lock |
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| 177 | __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock; |
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| 178 | (*__scheduler_lock){}; |
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| 179 | |
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| 180 | // Initialize the main cluster |
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| 181 | mainCluster = (cluster *)&storage_mainCluster; |
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| 182 | (*mainCluster){"Main Cluster", 0}; |
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| 183 | |
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| 184 | __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n"); |
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| 185 | |
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| 186 | // Start by initializing the main thread |
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| 187 | // SKULLDUGGERY: the mainThread steals the process main thread |
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| 188 | // which will then be scheduled by the mainProcessor normally |
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| 189 | mainThread = ($thread *)&storage_mainThread; |
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| 190 | current_stack_info_t info; |
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| 191 | info.storage = (__stack_t*)&storage_mainThreadCtx; |
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| 192 | (*mainThread){ &info }; |
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| 193 | |
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| 194 | __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n"); |
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| 195 | |
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| 196 | |
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| 197 | |
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| 198 | // Construct the processor context of the main processor |
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| 199 | void ?{}(processorCtx_t & this, processor * proc) { |
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| 200 | (this.__cor){ "Processor" }; |
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| 201 | this.__cor.starter = 0p; |
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| 202 | this.proc = proc; |
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| 203 | } |
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| 204 | |
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| 205 | void ?{}(processor & this) with( this ) { |
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[454f478] | 206 | ( this.terminated ){}; |
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[e660761] | 207 | ( this.runner ){}; |
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[a5e7233] | 208 | init( this, "Main Processor", *mainCluster, 0p ); |
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[e660761] | 209 | kernel_thread = pthread_self(); |
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| 210 | |
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| 211 | runner{ &this }; |
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| 212 | __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner); |
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| 213 | } |
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| 214 | |
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| 215 | // Initialize the main processor and the main processor ctx |
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| 216 | // (the coroutine that contains the processing control flow) |
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| 217 | mainProcessor = (processor *)&storage_mainProcessor; |
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| 218 | (*mainProcessor){}; |
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| 219 | |
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[c993b15] | 220 | register_tls( mainProcessor ); |
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| 221 | |
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[e660761] | 222 | //initialize the global state variables |
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[8fc652e0] | 223 | __cfaabi_tls.this_processor = mainProcessor; |
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| 224 | __cfaabi_tls.this_thread = mainThread; |
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[e660761] | 225 | |
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| 226 | #if !defined( __CFA_NO_STATISTICS__ ) |
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[8fc652e0] | 227 | __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats; |
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| 228 | __init_stats( __cfaabi_tls.this_stats ); |
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[e660761] | 229 | #endif |
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| 230 | |
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| 231 | // Enable preemption |
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| 232 | __kernel_alarm_startup(); |
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| 233 | |
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| 234 | // Add the main thread to the ready queue |
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| 235 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
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[254ad1b] | 236 | schedule_thread$(mainThread); |
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[e660761] | 237 | |
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| 238 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
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| 239 | // 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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| 240 | // mainThread is on the ready queue when this call is made. |
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[8fc652e0] | 241 | __kernel_first_resume( __cfaabi_tls.this_processor ); |
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[e660761] | 242 | |
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| 243 | |
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| 244 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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| 245 | |
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| 246 | __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n"); |
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| 247 | |
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[8fc652e0] | 248 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[a3821fa] | 249 | enable_interrupts(); |
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[8fc652e0] | 250 | /* paranoid */ verify( __preemption_enabled() ); |
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| 251 | |
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[e660761] | 252 | } |
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| 253 | |
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| 254 | static void __kernel_shutdown(void) { |
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[8fc652e0] | 255 | /* paranoid */ verify( __preemption_enabled() ); |
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[e660761] | 256 | disable_interrupts(); |
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[8fc652e0] | 257 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[e660761] | 258 | |
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| 259 | __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n"); |
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| 260 | |
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| 261 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
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| 262 | // When its coroutine terminates, it return control to the mainThread |
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| 263 | // which is currently here |
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| 264 | __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE); |
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[8fc652e0] | 265 | __kernel_last_resume( __cfaabi_tls.this_processor ); |
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[e660761] | 266 | mainThread->self_cor.state = Halted; |
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| 267 | |
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| 268 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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| 269 | |
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| 270 | // Disable preemption |
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| 271 | __kernel_alarm_shutdown(); |
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| 272 | |
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[a5a01faa] | 273 | #if !defined( __CFA_NO_STATISTICS__ ) |
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| 274 | __stats_t * st = (__stats_t *)& storage_mainProcStats; |
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| 275 | __tally_stats(mainCluster->stats, st); |
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| 276 | if( 0 != mainProcessor->print_stats ) { |
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| 277 | __print_stats( st, mainProcessor->print_stats, "Processor ", mainProcessor->name, (void*)mainProcessor ); |
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| 278 | } |
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[73f4d08] | 279 | #if defined(CFA_STATS_ARRAY) |
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| 280 | __flush_stat( st, "Processor", mainProcessor ); |
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| 281 | #endif |
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[a5a01faa] | 282 | #endif |
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| 283 | |
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[c993b15] | 284 | unregister_tls( mainProcessor ); |
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| 285 | |
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[e660761] | 286 | // Destroy the main processor and its context in reverse order of construction |
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| 287 | // These were manually constructed so we need manually destroy them |
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| 288 | void ^?{}(processor & this) with( this ){ |
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| 289 | deinit( this ); |
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| 290 | |
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| 291 | /* paranoid */ verify( this.do_terminate == true ); |
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| 292 | __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner); |
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| 293 | } |
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| 294 | |
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| 295 | ^(*mainProcessor){}; |
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| 296 | |
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| 297 | // Final step, destroy the main thread since it is no longer needed |
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| 298 | |
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| 299 | // Since we provided a stack to this taxk it will not destroy anything |
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| 300 | /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1)); |
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| 301 | ^(*mainThread){}; |
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| 302 | |
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| 303 | ^(*mainCluster){}; |
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| 304 | |
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| 305 | ^(*__scheduler_lock){}; |
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| 306 | |
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| 307 | ^(__cfa_dbg_global_clusters.list){}; |
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| 308 | ^(__cfa_dbg_global_clusters.lock){}; |
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| 309 | |
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| 310 | __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n"); |
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| 311 | } |
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| 312 | |
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| 313 | //============================================================================================= |
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| 314 | // Kernel Initial Scheduling logic |
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| 315 | //============================================================================================= |
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| 316 | |
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| 317 | // Context invoker for processors |
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| 318 | // This is the entry point for processors (kernel threads) *except* for the main processor |
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| 319 | // It effectively constructs a coroutine by stealing the pthread stack |
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| 320 | static void * __invoke_processor(void * arg) { |
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| 321 | #if !defined( __CFA_NO_STATISTICS__ ) |
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| 322 | __stats_t local_stats; |
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| 323 | __init_stats( &local_stats ); |
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[8fc652e0] | 324 | __cfaabi_tls.this_stats = &local_stats; |
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[e660761] | 325 | #endif |
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| 326 | |
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| 327 | processor * proc = (processor *) arg; |
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[8fc652e0] | 328 | __cfaabi_tls.this_processor = proc; |
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| 329 | __cfaabi_tls.this_thread = 0p; |
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| 330 | __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1]; |
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[c993b15] | 331 | |
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| 332 | register_tls( proc ); |
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| 333 | |
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[e660761] | 334 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 335 | // which is needed for the 2-step context switch. However, there is no reason |
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| 336 | // to waste the perfectly valid stack create by pthread. |
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| 337 | current_stack_info_t info; |
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| 338 | __stack_t ctx; |
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| 339 | info.storage = &ctx; |
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| 340 | (proc->runner){ proc, &info }; |
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| 341 | |
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| 342 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage); |
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| 343 | |
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| 344 | //Set global state |
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[8fc652e0] | 345 | __cfaabi_tls.this_thread = 0p; |
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[e660761] | 346 | |
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| 347 | //We now have a proper context from which to schedule threads |
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| 348 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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| 349 | |
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| 350 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 351 | // resume it to start it like it normally would, it will just context switch |
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| 352 | // back to here. Instead directly call the main since we already are on the |
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| 353 | // appropriate stack. |
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| 354 | get_coroutine(proc->runner)->state = Active; |
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| 355 | main( proc->runner ); |
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| 356 | get_coroutine(proc->runner)->state = Halted; |
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| 357 | |
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| 358 | // Main routine of the core returned, the core is now fully terminated |
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| 359 | __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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| 360 | |
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| 361 | #if !defined(__CFA_NO_STATISTICS__) |
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| 362 | __tally_stats(proc->cltr->stats, &local_stats); |
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| 363 | if( 0 != proc->print_stats ) { |
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[1b033b8] | 364 | __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc ); |
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[e660761] | 365 | } |
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[73f4d08] | 366 | #if defined(CFA_STATS_ARRAY) |
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| 367 | __flush_stat( &local_stats, "Processor", proc ); |
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| 368 | #endif |
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[e660761] | 369 | #endif |
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| 370 | |
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[c993b15] | 371 | unregister_tls( proc ); |
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| 372 | |
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[e660761] | 373 | return 0p; |
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| 374 | } |
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| 375 | |
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| 376 | static void __kernel_first_resume( processor * this ) { |
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| 377 | $thread * src = mainThread; |
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| 378 | $coroutine * dst = get_coroutine(this->runner); |
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| 379 | |
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[8fc652e0] | 380 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[e660761] | 381 | |
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[8fc652e0] | 382 | __cfaabi_tls.this_thread->curr_cor = dst; |
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[e660761] | 383 | __stack_prepare( &dst->stack, 65000 ); |
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| 384 | __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine); |
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| 385 | |
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[8fc652e0] | 386 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[e660761] | 387 | |
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| 388 | dst->last = &src->self_cor; |
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| 389 | dst->starter = dst->starter ? dst->starter : &src->self_cor; |
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| 390 | |
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| 391 | // make sure the current state is still correct |
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| 392 | /* paranoid */ verify(src->state == Ready); |
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| 393 | |
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| 394 | // context switch to specified coroutine |
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| 395 | verify( dst->context.SP ); |
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| 396 | __cfactx_switch( &src->context, &dst->context ); |
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| 397 | // when __cfactx_switch returns we are back in the src coroutine |
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| 398 | |
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| 399 | mainThread->curr_cor = &mainThread->self_cor; |
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| 400 | |
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| 401 | // make sure the current state has been update |
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| 402 | /* paranoid */ verify(src->state == Active); |
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| 403 | |
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[8fc652e0] | 404 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[e660761] | 405 | } |
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| 406 | |
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| 407 | // KERNEL_ONLY |
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| 408 | static void __kernel_last_resume( processor * this ) { |
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| 409 | $coroutine * src = &mainThread->self_cor; |
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| 410 | $coroutine * dst = get_coroutine(this->runner); |
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| 411 | |
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[8fc652e0] | 412 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 413 | /* paranoid */ verify( dst->starter == src ); |
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| 414 | /* paranoid */ verify( dst->context.SP ); |
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[e660761] | 415 | |
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| 416 | // SKULLDUGGERY in debug the processors check that the |
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| 417 | // stack is still within the limit of the stack limits after running a thread. |
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| 418 | // that check doesn't make sense if we context switch to the processor using the |
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| 419 | // coroutine semantics. Since this is a special case, use the current context |
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| 420 | // info to populate these fields. |
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| 421 | __cfaabi_dbg_debug_do( |
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| 422 | __stack_context_t ctx; |
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| 423 | CtxGet( ctx ); |
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| 424 | mainThread->context.SP = ctx.SP; |
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| 425 | mainThread->context.FP = ctx.FP; |
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| 426 | ) |
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| 427 | |
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| 428 | // context switch to the processor |
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| 429 | __cfactx_switch( &src->context, &dst->context ); |
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| 430 | } |
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| 431 | |
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| 432 | |
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| 433 | //============================================================================================= |
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| 434 | // Kernel Object Constructors logic |
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| 435 | //============================================================================================= |
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| 436 | //----------------------------------------------------------------------------- |
---|
| 437 | // Main thread construction |
---|
| 438 | static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) { |
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| 439 | stack.storage = info->storage; |
---|
| 440 | with(*stack.storage) { |
---|
| 441 | limit = info->limit; |
---|
| 442 | base = info->base; |
---|
| 443 | } |
---|
| 444 | __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage; |
---|
| 445 | *istorage |= 0x1; |
---|
| 446 | name = "Main Thread"; |
---|
| 447 | state = Start; |
---|
| 448 | starter = 0p; |
---|
| 449 | last = 0p; |
---|
| 450 | cancellation = 0p; |
---|
| 451 | } |
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| 452 | |
---|
| 453 | static void ?{}( $thread & this, current_stack_info_t * info) with( this ) { |
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[6a77224] | 454 | ticket = TICKET_RUNNING; |
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[e660761] | 455 | state = Start; |
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| 456 | self_cor{ info }; |
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| 457 | curr_cor = &self_cor; |
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| 458 | curr_cluster = mainCluster; |
---|
| 459 | self_mon.owner = &this; |
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| 460 | self_mon.recursion = 1; |
---|
| 461 | self_mon_p = &self_mon; |
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| 462 | link.next = 0p; |
---|
| 463 | link.prev = 0p; |
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[2b96031] | 464 | link.ts = 0; |
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[89eff25] | 465 | link.preferred = -1u; |
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| 466 | last_proc = 0p; |
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[b4b63e8] | 467 | #if defined( __CFA_WITH_VERIFY__ ) |
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[ac12f1f] | 468 | canary = 0x0D15EA5E0D15EA5Ep; |
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[b4b63e8] | 469 | #endif |
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[e660761] | 470 | |
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| 471 | node.next = 0p; |
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| 472 | node.prev = 0p; |
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| 473 | doregister(curr_cluster, this); |
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| 474 | |
---|
| 475 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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| 476 | } |
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| 477 | |
---|
| 478 | //----------------------------------------------------------------------------- |
---|
| 479 | // Processor |
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| 480 | // Construct the processor context of non-main processors |
---|
| 481 | static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 482 | (this.__cor){ info }; |
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| 483 | this.proc = proc; |
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| 484 | } |
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| 485 | |
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[a5e7233] | 486 | static void init(processor & this, const char name[], cluster & _cltr, $thread * initT) with( this ) { |
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[e660761] | 487 | this.name = name; |
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| 488 | this.cltr = &_cltr; |
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[431cd4f] | 489 | this.rdq.its = 0; |
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| 490 | this.rdq.itr = 0; |
---|
| 491 | this.rdq.id = -1u; |
---|
| 492 | this.rdq.target = -1u; |
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| 493 | this.rdq.cutoff = -1ull; |
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[e660761] | 494 | do_terminate = false; |
---|
| 495 | preemption_alarm = 0p; |
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| 496 | pending_preemption = false; |
---|
| 497 | |
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[78da4ab] | 498 | this.io.ctx = 0p; |
---|
[dddb3dd0] | 499 | this.io.pending = false; |
---|
| 500 | this.io.dirty = false; |
---|
| 501 | |
---|
[a5e7233] | 502 | this.init.thrd = initT; |
---|
[a1538cd] | 503 | |
---|
[dddb3dd0] | 504 | this.idle = eventfd(0, 0); |
---|
| 505 | if (idle < 0) { |
---|
| 506 | abort("KERNEL ERROR: PROCESSOR EVENTFD - %s\n", strerror(errno)); |
---|
| 507 | } |
---|
[78da4ab] | 508 | |
---|
[e660761] | 509 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 510 | print_stats = 0; |
---|
| 511 | print_halts = false; |
---|
| 512 | #endif |
---|
| 513 | |
---|
| 514 | __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this); |
---|
| 515 | } |
---|
| 516 | |
---|
| 517 | // Not a ctor, it just preps the destruction but should not destroy members |
---|
| 518 | static void deinit(processor & this) { |
---|
[dddb3dd0] | 519 | close(this.idle); |
---|
[e660761] | 520 | } |
---|
| 521 | |
---|
[a5e7233] | 522 | void ?{}(processor & this, const char name[], cluster & _cltr, $thread * initT) { |
---|
[454f478] | 523 | ( this.terminated ){}; |
---|
[e660761] | 524 | ( this.runner ){}; |
---|
[62502cc4] | 525 | |
---|
| 526 | disable_interrupts(); |
---|
[a5e7233] | 527 | init( this, name, _cltr, initT ); |
---|
[a3821fa] | 528 | enable_interrupts(); |
---|
[e660761] | 529 | |
---|
| 530 | __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this); |
---|
| 531 | |
---|
| 532 | this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this ); |
---|
[a5e7233] | 533 | } |
---|
[e660761] | 534 | |
---|
[a5e7233] | 535 | void ?{}(processor & this, const char name[], cluster & _cltr) { |
---|
| 536 | (this){name, _cltr, 0p}; |
---|
[e660761] | 537 | } |
---|
| 538 | |
---|
[bfcf6b9] | 539 | extern size_t __page_size; |
---|
[e660761] | 540 | void ^?{}(processor & this) with( this ){ |
---|
| 541 | if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) { |
---|
| 542 | __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this); |
---|
| 543 | |
---|
| 544 | __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED); |
---|
| 545 | __wake_proc( &this ); |
---|
| 546 | |
---|
[454f478] | 547 | wait( terminated ); |
---|
[8fc652e0] | 548 | /* paranoid */ verify( active_processor() != &this); |
---|
[e660761] | 549 | } |
---|
| 550 | |
---|
[bfcf6b9] | 551 | __destroy_pthread( kernel_thread, this.stack, 0p ); |
---|
[e660761] | 552 | |
---|
[62502cc4] | 553 | disable_interrupts(); |
---|
| 554 | deinit( this ); |
---|
[a3821fa] | 555 | enable_interrupts(); |
---|
[e660761] | 556 | } |
---|
| 557 | |
---|
| 558 | //----------------------------------------------------------------------------- |
---|
| 559 | // Cluster |
---|
[6a9b12b] | 560 | static void ?{}(__cluster_proc_list & this) { |
---|
[1eb239e4] | 561 | this.lock = 0; |
---|
| 562 | this.idle = 0; |
---|
| 563 | this.total = 0; |
---|
| 564 | } |
---|
| 565 | |
---|
[e660761] | 566 | void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) { |
---|
| 567 | this.name = name; |
---|
| 568 | this.preemption_rate = preemption_rate; |
---|
| 569 | ready_queue{}; |
---|
| 570 | |
---|
| 571 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 572 | print_stats = 0; |
---|
| 573 | stats = alloc(); |
---|
| 574 | __init_stats( stats ); |
---|
| 575 | #endif |
---|
| 576 | |
---|
| 577 | threads{ __get }; |
---|
| 578 | |
---|
[78da4ab] | 579 | io.arbiter = create(); |
---|
| 580 | io.params = io_params; |
---|
| 581 | |
---|
[e660761] | 582 | doregister(this); |
---|
| 583 | |
---|
| 584 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
[772411a] | 585 | disable_interrupts(); |
---|
[e660761] | 586 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 587 | |
---|
| 588 | // Adjust the ready queue size |
---|
[a017ee7] | 589 | ready_queue_grow( &this ); |
---|
[e660761] | 590 | |
---|
| 591 | // Unlock the RWlock |
---|
| 592 | ready_mutate_unlock( last_size ); |
---|
[a3821fa] | 593 | enable_interrupts( false ); // Don't poll, could be in main cluster |
---|
[e660761] | 594 | } |
---|
| 595 | |
---|
| 596 | void ^?{}(cluster & this) { |
---|
[78da4ab] | 597 | destroy(this.io.arbiter); |
---|
[e660761] | 598 | |
---|
| 599 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
[772411a] | 600 | disable_interrupts(); |
---|
[e660761] | 601 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 602 | |
---|
| 603 | // Adjust the ready queue size |
---|
[a017ee7] | 604 | ready_queue_shrink( &this ); |
---|
[e660761] | 605 | |
---|
| 606 | // Unlock the RWlock |
---|
| 607 | ready_mutate_unlock( last_size ); |
---|
[a3821fa] | 608 | enable_interrupts( false ); // Don't poll, could be in main cluster |
---|
[e660761] | 609 | |
---|
| 610 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 611 | if( 0 != this.print_stats ) { |
---|
[1b033b8] | 612 | __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this ); |
---|
[e660761] | 613 | } |
---|
[73f4d08] | 614 | #if defined(CFA_STATS_ARRAY) |
---|
| 615 | __flush_stat( this.stats, "Cluster", &this ); |
---|
| 616 | #endif |
---|
[e660761] | 617 | free( this.stats ); |
---|
| 618 | #endif |
---|
| 619 | |
---|
| 620 | unregister(this); |
---|
| 621 | } |
---|
| 622 | |
---|
| 623 | //============================================================================================= |
---|
| 624 | // Miscellaneous Initialization |
---|
| 625 | //============================================================================================= |
---|
| 626 | //----------------------------------------------------------------------------- |
---|
| 627 | // Global Queues |
---|
| 628 | static void doregister( cluster & cltr ) { |
---|
| 629 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 630 | push_front( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 631 | unlock ( __cfa_dbg_global_clusters.lock ); |
---|
| 632 | } |
---|
| 633 | |
---|
| 634 | static void unregister( cluster & cltr ) { |
---|
| 635 | lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 636 | remove( __cfa_dbg_global_clusters.list, cltr ); |
---|
| 637 | unlock( __cfa_dbg_global_clusters.lock ); |
---|
| 638 | } |
---|
| 639 | |
---|
| 640 | void doregister( cluster * cltr, $thread & thrd ) { |
---|
| 641 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
| 642 | cltr->nthreads += 1; |
---|
| 643 | push_front(cltr->threads, thrd); |
---|
| 644 | unlock (cltr->thread_list_lock); |
---|
| 645 | } |
---|
| 646 | |
---|
| 647 | void unregister( cluster * cltr, $thread & thrd ) { |
---|
| 648 | lock (cltr->thread_list_lock __cfaabi_dbg_ctx2); |
---|
| 649 | remove(cltr->threads, thrd ); |
---|
| 650 | cltr->nthreads -= 1; |
---|
| 651 | unlock(cltr->thread_list_lock); |
---|
| 652 | } |
---|
| 653 | |
---|
[c993b15] | 654 | static void register_tls( processor * this ) { |
---|
| 655 | // Register and Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
| 656 | uint_fast32_t last_size; |
---|
| 657 | [this->unique_id, last_size] = ready_mutate_register(); |
---|
| 658 | |
---|
| 659 | this->cltr->procs.total += 1u; |
---|
| 660 | insert_last(this->cltr->procs.actives, *this); |
---|
| 661 | |
---|
| 662 | // Adjust the ready queue size |
---|
| 663 | ready_queue_grow( this->cltr ); |
---|
| 664 | |
---|
| 665 | // Unlock the RWlock |
---|
| 666 | ready_mutate_unlock( last_size ); |
---|
| 667 | } |
---|
| 668 | |
---|
| 669 | |
---|
| 670 | static void unregister_tls( processor * this ) { |
---|
| 671 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
| 672 | uint_fast32_t last_size = ready_mutate_lock(); |
---|
| 673 | this->cltr->procs.total -= 1u; |
---|
| 674 | remove(*this); |
---|
| 675 | |
---|
| 676 | // clear the cluster so nothing gets pushed to local queues |
---|
| 677 | cluster * cltr = this->cltr; |
---|
| 678 | this->cltr = 0p; |
---|
| 679 | |
---|
| 680 | // Adjust the ready queue size |
---|
| 681 | ready_queue_shrink( cltr ); |
---|
| 682 | |
---|
| 683 | // Unlock the RWlock and unregister: we don't need the read_lock any more |
---|
| 684 | ready_mutate_unregister( this->unique_id, last_size ); |
---|
| 685 | } |
---|
| 686 | |
---|
[e660761] | 687 | static void check( int ret, const char func[] ) { |
---|
| 688 | if ( ret ) { // pthread routines return errno values |
---|
| 689 | abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) ); |
---|
| 690 | } // if |
---|
| 691 | } // Abort |
---|
| 692 | |
---|
| 693 | void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) { |
---|
| 694 | pthread_attr_t attr; |
---|
| 695 | |
---|
| 696 | check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
| 697 | |
---|
| 698 | size_t stacksize; |
---|
| 699 | // default stack size, normally defined by shell limit |
---|
| 700 | check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" ); |
---|
| 701 | assert( stacksize >= PTHREAD_STACK_MIN ); |
---|
| 702 | |
---|
| 703 | void * stack; |
---|
[97229d6] | 704 | #if CFA_PROCESSOR_USE_MMAP |
---|
| 705 | stacksize = ceiling( stacksize, __page_size ) + __page_size; |
---|
[dd92fe9] | 706 | stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); |
---|
[97229d6] | 707 | if(stack == ((void*)-1)) { |
---|
| 708 | abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 709 | } |
---|
| 710 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
| 711 | abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 712 | } // if |
---|
| 713 | #else |
---|
| 714 | __cfaabi_dbg_debug_do( |
---|
| 715 | stack = memalign( __page_size, stacksize + __page_size ); |
---|
| 716 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
| 717 | if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) { |
---|
| 718 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 719 | } // if |
---|
| 720 | ); |
---|
| 721 | __cfaabi_dbg_no_debug_do( |
---|
| 722 | stack = malloc( stacksize ); |
---|
| 723 | ); |
---|
| 724 | #endif |
---|
| 725 | |
---|
[e660761] | 726 | |
---|
| 727 | check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" ); |
---|
| 728 | |
---|
| 729 | check( pthread_create( pthread, &attr, start, arg ), "pthread_create" ); |
---|
| 730 | return stack; |
---|
[88cafe7] | 731 | } |
---|
[f2384c9a] | 732 | |
---|
[bfcf6b9] | 733 | void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) { |
---|
| 734 | int err = pthread_join( pthread, retval ); |
---|
| 735 | if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err)); |
---|
| 736 | |
---|
[97229d6] | 737 | #if CFA_PROCESSOR_USE_MMAP |
---|
| 738 | pthread_attr_t attr; |
---|
[bfcf6b9] | 739 | |
---|
[97229d6] | 740 | check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute |
---|
[bfcf6b9] | 741 | |
---|
[97229d6] | 742 | size_t stacksize; |
---|
| 743 | // default stack size, normally defined by shell limit |
---|
| 744 | check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" ); |
---|
| 745 | assert( stacksize >= PTHREAD_STACK_MIN ); |
---|
| 746 | stacksize += __page_size; |
---|
[bfcf6b9] | 747 | |
---|
[97229d6] | 748 | if(munmap(stack, stacksize) == -1) { |
---|
| 749 | abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 750 | } |
---|
| 751 | #else |
---|
[72a3aff] | 752 | __cfaabi_dbg_debug_do( |
---|
| 753 | // pthread has no mechanism to create the guard page in user supplied stack. |
---|
[28c35e2] | 754 | if ( mprotect( stack, __page_size, __map_prot ) == -1 ) { |
---|
[72a3aff] | 755 | abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) ); |
---|
| 756 | } // if |
---|
| 757 | ); |
---|
[97229d6] | 758 | free( stack ); |
---|
| 759 | #endif |
---|
[bfcf6b9] | 760 | } |
---|
| 761 | |
---|
[f2384c9a] | 762 | #if defined(__CFA_WITH_VERIFY__) |
---|
| 763 | static bool verify_fwd_bck_rng(void) { |
---|
[8fc652e0] | 764 | __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng); |
---|
[f2384c9a] | 765 | |
---|
| 766 | unsigned values[10]; |
---|
| 767 | for(i; 10) { |
---|
| 768 | values[i] = __tls_rand_fwd(); |
---|
| 769 | } |
---|
| 770 | |
---|
| 771 | __tls_rand_advance_bck(); |
---|
| 772 | |
---|
| 773 | for ( i; 9 -~= 0 ) { |
---|
| 774 | if(values[i] != __tls_rand_bck()) { |
---|
| 775 | return false; |
---|
| 776 | } |
---|
| 777 | } |
---|
| 778 | |
---|
| 779 | return true; |
---|
| 780 | } |
---|
[e67a82d] | 781 | #endif |
---|