[75f3522] | 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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[73abe95] | 7 | // kernel_private.hfa -- |
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[75f3522] | 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Mon Feb 13 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[1805b1b] | 12 | // Last Modified On : Sat Nov 30 19:25:02 2019 |
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| 13 | // Update Count : 8 |
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[75f3522] | 14 | // |
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| 15 | |
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[6b0b624] | 16 | #pragma once |
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[75f3522] | 17 | |
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[58b6d1b] | 18 | #include "kernel.hfa" |
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| 19 | #include "thread.hfa" |
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[75f3522] | 20 | |
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[73abe95] | 21 | #include "alarm.hfa" |
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[fa21ac9] | 22 | |
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[4aa2fb2] | 23 | |
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[75f3522] | 24 | //----------------------------------------------------------------------------- |
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| 25 | // Scheduler |
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[1c273d0] | 26 | |
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| 27 | extern "C" { |
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[2026bb6] | 28 | void disable_interrupts() OPTIONAL_THREAD; |
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[969b3fe] | 29 | void enable_interrupts_noPoll(); |
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[36982fc] | 30 | void enable_interrupts( __cfaabi_dbg_ctx_param ); |
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[1c273d0] | 31 | } |
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| 32 | |
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[ac2b598] | 33 | void __schedule_thread( $thread * ) __attribute__((nonnull (1))); |
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[75f3522] | 34 | |
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[e60e0dc] | 35 | //Block current thread and release/wake-up the following resources |
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[b0c7419] | 36 | void __leave_thread() __attribute__((noreturn)); |
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[db6f06a] | 37 | |
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[75f3522] | 38 | //----------------------------------------------------------------------------- |
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| 39 | // Processor |
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| 40 | void main(processorCtx_t *); |
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[85b1deb] | 41 | |
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[8c50aed] | 42 | void * __create_pthread( pthread_t *, void * (*)(void *), void * ); |
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[1805b1b] | 43 | |
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[85b1deb] | 44 | |
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[75f3522] | 45 | |
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[e60e0dc] | 46 | struct event_kernel_t { |
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[fa21ac9] | 47 | alarm_list_t alarms; |
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[ea7d2b0] | 48 | __spinlock_t lock; |
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[fa21ac9] | 49 | }; |
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| 50 | |
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[e60e0dc] | 51 | extern event_kernel_t * event_kernel; |
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| 52 | |
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[d8548e2] | 53 | struct __cfa_kernel_preemption_state_t { |
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[b69ea6b] | 54 | bool enabled; |
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| 55 | bool in_progress; |
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| 56 | unsigned short disable_count; |
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| 57 | }; |
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| 58 | |
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[afc2427] | 59 | extern volatile thread_local __cfa_kernel_preemption_state_t preemption_state __attribute__ ((tls_model ( "initial-exec" ))); |
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[c81ebf9] | 60 | |
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[6502a2b] | 61 | extern cluster * mainCluster; |
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| 62 | |
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[75f3522] | 63 | //----------------------------------------------------------------------------- |
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| 64 | // Threads |
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| 65 | extern "C" { |
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[c7a900a] | 66 | void __cfactx_invoke_thread(void (*main)(void *), void * this); |
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[75f3522] | 67 | } |
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| 68 | |
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[f7d6bb0] | 69 | __cfaabi_dbg_debug_do( |
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[ac2b598] | 70 | extern void __cfaabi_dbg_thread_register ( $thread * thrd ); |
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| 71 | extern void __cfaabi_dbg_thread_unregister( $thread * thrd ); |
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[f7d6bb0] | 72 | ) |
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| 73 | |
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[2d8f7b0] | 74 | // KERNEL ONLY unpark with out disabling interrupts |
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| 75 | void __unpark( $thread * thrd __cfaabi_dbg_ctx_param2 ); |
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| 76 | |
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[92976d9] | 77 | //----------------------------------------------------------------------------- |
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| 78 | // I/O |
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[b6f2b21] | 79 | void __kernel_io_startup ( cluster &, int, bool ); |
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[f6660520] | 80 | void __kernel_io_finish_start( cluster & ); |
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| 81 | void __kernel_io_prepare_stop( cluster & ); |
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| 82 | void __kernel_io_shutdown ( cluster &, bool ); |
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[92976d9] | 83 | |
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[969b3fe] | 84 | //----------------------------------------------------------------------------- |
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| 85 | // Utils |
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[7768b8d] | 86 | #define KERNEL_STORAGE(T,X) __attribute((aligned(__alignof__(T)))) static char storage_##X[sizeof(T)] |
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[969b3fe] | 87 | |
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[8c50aed] | 88 | static inline uint32_t __tls_rand() { |
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[21184e3] | 89 | kernelTLS.rand_seed ^= kernelTLS.rand_seed << 6; |
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| 90 | kernelTLS.rand_seed ^= kernelTLS.rand_seed >> 21; |
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| 91 | kernelTLS.rand_seed ^= kernelTLS.rand_seed << 7; |
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| 92 | return kernelTLS.rand_seed; |
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| 93 | } |
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| 94 | |
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[de94a60] | 95 | |
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[a1a17a74] | 96 | void doregister( struct cluster & cltr ); |
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| 97 | void unregister( struct cluster & cltr ); |
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[de94a60] | 98 | |
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[ac2b598] | 99 | void doregister( struct cluster * cltr, struct $thread & thrd ); |
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| 100 | void unregister( struct cluster * cltr, struct $thread & thrd ); |
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[de94a60] | 101 | |
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[504a7dc] | 102 | void doregister( struct cluster * cltr, struct processor * proc ); |
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| 103 | void unregister( struct cluster * cltr, struct processor * proc ); |
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| 104 | |
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[7768b8d] | 105 | //======================================================================= |
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| 106 | // Cluster lock API |
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| 107 | //======================================================================= |
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| 108 | struct __attribute__((aligned(64))) __processor_id { |
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| 109 | processor * volatile handle; |
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| 110 | volatile bool lock; |
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| 111 | }; |
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| 112 | |
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| 113 | // Lock-Free registering/unregistering of threads |
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| 114 | // Register a processor to a given cluster and get its unique id in return |
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[504a7dc] | 115 | unsigned doregister2( struct cluster * cltr, struct processor * proc ); |
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[7768b8d] | 116 | |
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| 117 | // Unregister a processor from a given cluster using its id, getting back the original pointer |
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[504a7dc] | 118 | void unregister2( struct cluster * cltr, struct processor * proc ); |
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[7768b8d] | 119 | |
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| 120 | //======================================================================= |
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| 121 | // Reader-writer lock implementation |
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| 122 | // Concurrent with doregister/unregister, |
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| 123 | // i.e., threads can be added at any point during or between the entry/exit |
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[dca5802] | 124 | |
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| 125 | //----------------------------------------------------------------------- |
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| 126 | // simple spinlock underlying the RWLock |
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| 127 | // Blocking acquire |
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[7768b8d] | 128 | static inline void __atomic_acquire(volatile bool * ll) { |
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| 129 | while( __builtin_expect(__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST), false) ) { |
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| 130 | while(__atomic_load_n(ll, (int)__ATOMIC_RELAXED)) |
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| 131 | asm volatile("pause"); |
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| 132 | } |
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| 133 | /* paranoid */ verify(*ll); |
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| 134 | } |
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| 135 | |
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[dca5802] | 136 | // Non-Blocking acquire |
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[7768b8d] | 137 | static inline bool __atomic_try_acquire(volatile bool * ll) { |
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[b798713] | 138 | return !__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST); |
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[7768b8d] | 139 | } |
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| 140 | |
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[dca5802] | 141 | // Release |
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[7768b8d] | 142 | static inline void __atomic_unlock(volatile bool * ll) { |
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| 143 | /* paranoid */ verify(*ll); |
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| 144 | __atomic_store_n(ll, (bool)false, __ATOMIC_RELEASE); |
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| 145 | } |
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| 146 | |
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| 147 | //----------------------------------------------------------------------- |
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| 148 | // Reader side : acquire when using the ready queue to schedule but not |
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| 149 | // creating/destroying queues |
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[b798713] | 150 | static inline void ready_schedule_lock( struct cluster * cltr, struct processor * proc) with(cltr->ready_lock) { |
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[7768b8d] | 151 | unsigned iproc = proc->id; |
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| 152 | /*paranoid*/ verify(data[iproc].handle == proc); |
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| 153 | /*paranoid*/ verify(iproc < ready); |
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| 154 | |
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| 155 | // Step 1 : make sure no writer are in the middle of the critical section |
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| 156 | while(__atomic_load_n(&lock, (int)__ATOMIC_RELAXED)) |
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| 157 | asm volatile("pause"); |
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| 158 | |
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| 159 | // Fence needed because we don't want to start trying to acquire the lock |
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| 160 | // before we read a false. |
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| 161 | // Not needed on x86 |
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| 162 | // std::atomic_thread_fence(std::memory_order_seq_cst); |
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| 163 | |
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| 164 | // Step 2 : acquire our local lock |
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| 165 | __atomic_acquire( &data[iproc].lock ); |
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| 166 | /*paranoid*/ verify(data[iproc].lock); |
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| 167 | } |
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| 168 | |
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[b798713] | 169 | static inline void ready_schedule_unlock( struct cluster * cltr, struct processor * proc) with(cltr->ready_lock) { |
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[7768b8d] | 170 | unsigned iproc = proc->id; |
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| 171 | /*paranoid*/ verify(data[iproc].handle == proc); |
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| 172 | /*paranoid*/ verify(iproc < ready); |
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| 173 | /*paranoid*/ verify(data[iproc].lock); |
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[dca5802] | 174 | __atomic_unlock(&data[iproc].lock); |
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[7768b8d] | 175 | } |
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| 176 | |
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| 177 | //----------------------------------------------------------------------- |
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| 178 | // Writer side : acquire when changing the ready queue, e.g. adding more |
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| 179 | // queues or removing them. |
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| 180 | uint_fast32_t ready_mutate_lock( struct cluster & cltr ); |
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| 181 | |
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[dca5802] | 182 | void ready_mutate_unlock( struct cluster & cltr, uint_fast32_t /* value returned by lock */ ); |
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[7768b8d] | 183 | |
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[b798713] | 184 | //======================================================================= |
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| 185 | // Ready-Queue API |
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[dca5802] | 186 | //----------------------------------------------------------------------- |
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| 187 | // push thread onto a ready queue for a cluster |
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| 188 | // returns true if the list was previously empty, false otherwise |
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[504a7dc] | 189 | __attribute__((hot)) bool push(struct cluster * cltr, struct $thread * thrd); |
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[dca5802] | 190 | |
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| 191 | //----------------------------------------------------------------------- |
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| 192 | // pop thread from the ready queue of a cluster |
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| 193 | // returns 0p if empty |
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[504a7dc] | 194 | __attribute__((hot)) struct $thread * pop(struct cluster * cltr); |
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[dca5802] | 195 | |
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| 196 | //----------------------------------------------------------------------- |
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| 197 | // Increase the width of the ready queue (number of lanes) by 4 |
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[b798713] | 198 | void ready_queue_grow (struct cluster * cltr); |
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[dca5802] | 199 | |
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| 200 | //----------------------------------------------------------------------- |
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| 201 | // Decrease the width of the ready queue (number of lanes) by 4 |
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[b798713] | 202 | void ready_queue_shrink(struct cluster * cltr); |
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| 203 | |
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[dca5802] | 204 | //----------------------------------------------------------------------- |
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| 205 | // Statics call at the end of each thread to register statistics |
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[b798713] | 206 | #if !defined(__CFA_NO_STATISTICS__) |
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| 207 | void stats_tls_tally(struct cluster * cltr); |
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| 208 | #else |
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| 209 | static inline void stats_tls_tally(struct cluster * cltr) {} |
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| 210 | #endif |
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[de94a60] | 211 | |
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[75f3522] | 212 | // Local Variables: // |
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| 213 | // mode: c // |
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| 214 | // tab-width: 4 // |
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[4aa2fb2] | 215 | // End: // |
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