[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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[fd9b524] | 12 | // Last Modified On : Wed Aug 12 08:21:33 2020
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| 13 | // Update Count : 9
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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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[8834751] | 22 | #include "stats.hfa"
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[fa21ac9] | 23 |
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[75f3522] | 24 | //-----------------------------------------------------------------------------
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| 25 | // Scheduler
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[1c273d0] | 26 |
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[37ba662] | 27 | struct __attribute__((aligned(128))) __scheduler_lock_id_t;
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[9b1dcc2] | 28 |
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[1c273d0] | 29 | extern "C" {
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[2026bb6] | 30 | void disable_interrupts() OPTIONAL_THREAD;
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[969b3fe] | 31 | void enable_interrupts_noPoll();
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[36982fc] | 32 | void enable_interrupts( __cfaabi_dbg_ctx_param );
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[1c273d0] | 33 | }
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| 34 |
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[efc171d1] | 35 | void __schedule_thread( struct __processor_id_t *, $thread * )
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| 36 | #if defined(NDEBUG) || (!defined(__CFA_DEBUG__) && !defined(__CFA_VERIFY__))
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| 37 | __attribute__((nonnull (2)))
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| 38 | #endif
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| 39 | ;
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[75f3522] | 40 |
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[e60e0dc] | 41 | //Block current thread and release/wake-up the following resources
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[b0c7419] | 42 | void __leave_thread() __attribute__((noreturn));
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[db6f06a] | 43 |
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[75f3522] | 44 | //-----------------------------------------------------------------------------
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| 45 | // Processor
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| 46 | void main(processorCtx_t *);
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[85b1deb] | 47 |
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[8c50aed] | 48 | void * __create_pthread( pthread_t *, void * (*)(void *), void * );
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[1805b1b] | 49 |
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[85b1deb] | 50 |
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[75f3522] | 51 |
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[6502a2b] | 52 | extern cluster * mainCluster;
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| 53 |
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[75f3522] | 54 | //-----------------------------------------------------------------------------
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| 55 | // Threads
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| 56 | extern "C" {
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[c7a900a] | 57 | void __cfactx_invoke_thread(void (*main)(void *), void * this);
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[75f3522] | 58 | }
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| 59 |
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[f7d6bb0] | 60 | __cfaabi_dbg_debug_do(
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[ac2b598] | 61 | extern void __cfaabi_dbg_thread_register ( $thread * thrd );
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| 62 | extern void __cfaabi_dbg_thread_unregister( $thread * thrd );
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[f7d6bb0] | 63 | )
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| 64 |
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[2d8f7b0] | 65 | // KERNEL ONLY unpark with out disabling interrupts
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[e235429] | 66 | void __unpark( struct __processor_id_t *, $thread * thrd );
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[2d8f7b0] | 67 |
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[f00b26d4] | 68 | static inline bool __post(single_sem & this, struct __processor_id_t * id) {
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| 69 | for() {
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| 70 | struct $thread * expected = this.ptr;
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| 71 | if(expected == 1p) return false;
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| 72 | if(expected == 0p) {
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| 73 | if(__atomic_compare_exchange_n(&this.ptr, &expected, 1p, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
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| 74 | return false;
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| 75 | }
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| 76 | }
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| 77 | else {
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| 78 | if(__atomic_compare_exchange_n(&this.ptr, &expected, 0p, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
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[e235429] | 79 | __unpark( id, expected );
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[f00b26d4] | 80 | return true;
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| 81 | }
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| 82 | }
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| 83 | }
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| 84 | }
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[92976d9] | 85 |
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[969b3fe] | 86 | //-----------------------------------------------------------------------------
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| 87 | // Utils
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[ac2b598] | 88 | void doregister( struct cluster * cltr, struct $thread & thrd );
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| 89 | void unregister( struct cluster * cltr, struct $thread & thrd );
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[de94a60] | 90 |
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[f00b26d4] | 91 | //-----------------------------------------------------------------------------
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| 92 | // I/O
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| 93 | void ^?{}(io_context & this, bool );
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| 94 |
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[7768b8d] | 95 | //=======================================================================
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| 96 | // Cluster lock API
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| 97 | //=======================================================================
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[b388ee81] | 98 | // Cells use by the reader writer lock
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| 99 | // while not generic it only relies on a opaque pointer
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[37ba662] | 100 | struct __attribute__((aligned(128))) __scheduler_lock_id_t {
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[64a7146] | 101 | // Spin lock used as the underlying lock
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[7768b8d] | 102 | volatile bool lock;
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[64a7146] | 103 |
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| 104 | // Handle pointing to the proc owning this cell
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| 105 | // Used for allocating cells and debugging
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| 106 | __processor_id_t * volatile handle;
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| 107 |
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| 108 | #ifdef __CFA_WITH_VERIFY__
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| 109 | // Debug, check if this is owned for reading
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| 110 | bool owned;
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| 111 | #endif
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[7768b8d] | 112 | };
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| 113 |
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[64a7146] | 114 | static_assert( sizeof(struct __scheduler_lock_id_t) <= __alignof(struct __scheduler_lock_id_t));
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| 115 |
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[7768b8d] | 116 | // Lock-Free registering/unregistering of threads
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| 117 | // Register a processor to a given cluster and get its unique id in return
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[9b1dcc2] | 118 | unsigned doregister( struct __processor_id_t * proc );
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[7768b8d] | 119 |
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| 120 | // Unregister a processor from a given cluster using its id, getting back the original pointer
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[9b1dcc2] | 121 | void unregister( struct __processor_id_t * proc );
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[7768b8d] | 122 |
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[1eb239e4] | 123 | //-----------------------------------------------------------------------
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| 124 | // Cluster idle lock/unlock
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| 125 | static inline void lock(__cluster_idles & this) {
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| 126 | for() {
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| 127 | uint64_t l = this.lock;
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| 128 | if(
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| 129 | (0 == (l % 2))
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| 130 | && __atomic_compare_exchange_n(&this.lock, &l, l + 1, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
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| 131 | ) return;
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| 132 | Pause();
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| 133 | }
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| 134 | }
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| 135 |
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| 136 | static inline void unlock(__cluster_idles & this) {
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| 137 | /* paranoid */ verify( 1 == (this.lock % 2) );
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| 138 | __atomic_fetch_add( &this.lock, 1, __ATOMIC_SEQ_CST );
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| 139 | }
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| 140 |
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[7768b8d] | 141 | //=======================================================================
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| 142 | // Reader-writer lock implementation
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| 143 | // Concurrent with doregister/unregister,
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| 144 | // i.e., threads can be added at any point during or between the entry/exit
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[dca5802] | 145 |
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| 146 | //-----------------------------------------------------------------------
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| 147 | // simple spinlock underlying the RWLock
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| 148 | // Blocking acquire
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[7768b8d] | 149 | static inline void __atomic_acquire(volatile bool * ll) {
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| 150 | while( __builtin_expect(__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST), false) ) {
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| 151 | while(__atomic_load_n(ll, (int)__ATOMIC_RELAXED))
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[fd9b524] | 152 | Pause();
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[7768b8d] | 153 | }
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| 154 | /* paranoid */ verify(*ll);
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| 155 | }
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| 156 |
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[dca5802] | 157 | // Non-Blocking acquire
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[7768b8d] | 158 | static inline bool __atomic_try_acquire(volatile bool * ll) {
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[b798713] | 159 | return !__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST);
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[7768b8d] | 160 | }
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| 161 |
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[dca5802] | 162 | // Release
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[7768b8d] | 163 | static inline void __atomic_unlock(volatile bool * ll) {
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| 164 | /* paranoid */ verify(*ll);
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| 165 | __atomic_store_n(ll, (bool)false, __ATOMIC_RELEASE);
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| 166 | }
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| 167 |
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[b388ee81] | 168 | //-----------------------------------------------------------------------
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| 169 | // Reader-Writer lock protecting the ready-queues
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| 170 | // while this lock is mostly generic some aspects
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| 171 | // have been hard-coded to for the ready-queue for
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| 172 | // simplicity and performance
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| 173 | struct __scheduler_RWLock_t {
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| 174 | // total cachelines allocated
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| 175 | unsigned int max;
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| 176 |
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| 177 | // cachelines currently in use
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| 178 | volatile unsigned int alloc;
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| 179 |
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| 180 | // cachelines ready to itereate over
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| 181 | // (!= to alloc when thread is in second half of doregister)
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| 182 | volatile unsigned int ready;
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| 183 |
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| 184 | // writer lock
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| 185 | volatile bool lock;
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| 186 |
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| 187 | // data pointer
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[9b1dcc2] | 188 | __scheduler_lock_id_t * data;
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[b388ee81] | 189 | };
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| 190 |
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| 191 | void ?{}(__scheduler_RWLock_t & this);
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| 192 | void ^?{}(__scheduler_RWLock_t & this);
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| 193 |
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| 194 | extern __scheduler_RWLock_t * __scheduler_lock;
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| 195 |
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[7768b8d] | 196 | //-----------------------------------------------------------------------
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| 197 | // Reader side : acquire when using the ready queue to schedule but not
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| 198 | // creating/destroying queues
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[9b1dcc2] | 199 | static inline void ready_schedule_lock( struct __processor_id_t * proc) with(*__scheduler_lock) {
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[7768b8d] | 200 | unsigned iproc = proc->id;
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| 201 | /*paranoid*/ verify(data[iproc].handle == proc);
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| 202 | /*paranoid*/ verify(iproc < ready);
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| 203 |
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| 204 | // Step 1 : make sure no writer are in the middle of the critical section
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| 205 | while(__atomic_load_n(&lock, (int)__ATOMIC_RELAXED))
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[fd9b524] | 206 | Pause();
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[7768b8d] | 207 |
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| 208 | // Fence needed because we don't want to start trying to acquire the lock
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| 209 | // before we read a false.
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| 210 | // Not needed on x86
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| 211 | // std::atomic_thread_fence(std::memory_order_seq_cst);
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| 212 |
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| 213 | // Step 2 : acquire our local lock
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| 214 | __atomic_acquire( &data[iproc].lock );
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| 215 | /*paranoid*/ verify(data[iproc].lock);
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[64a7146] | 216 |
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| 217 | #ifdef __CFA_WITH_VERIFY__
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| 218 | // Debug, check if this is owned for reading
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| 219 | data[iproc].owned = true;
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| 220 | #endif
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[7768b8d] | 221 | }
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| 222 |
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[9b1dcc2] | 223 | static inline void ready_schedule_unlock( struct __processor_id_t * proc) with(*__scheduler_lock) {
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[7768b8d] | 224 | unsigned iproc = proc->id;
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| 225 | /*paranoid*/ verify(data[iproc].handle == proc);
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| 226 | /*paranoid*/ verify(iproc < ready);
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| 227 | /*paranoid*/ verify(data[iproc].lock);
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[64a7146] | 228 | /*paranoid*/ verify(data[iproc].owned);
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| 229 | #ifdef __CFA_WITH_VERIFY__
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| 230 | // Debug, check if this is owned for reading
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| 231 | data[iproc].owned = false;
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| 232 | #endif
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[dca5802] | 233 | __atomic_unlock(&data[iproc].lock);
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[7768b8d] | 234 | }
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| 235 |
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[64a7146] | 236 | #ifdef __CFA_WITH_VERIFY__
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| 237 | static inline bool ready_schedule_islocked( struct __processor_id_t * proc) {
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| 238 | return __scheduler_lock->data[proc->id].owned;
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| 239 | }
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| 240 |
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| 241 | static inline bool ready_mutate_islocked() {
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| 242 | return __scheduler_lock->lock;
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| 243 | }
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| 244 | #endif
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| 245 |
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[7768b8d] | 246 | //-----------------------------------------------------------------------
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| 247 | // Writer side : acquire when changing the ready queue, e.g. adding more
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| 248 | // queues or removing them.
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[b388ee81] | 249 | uint_fast32_t ready_mutate_lock( void );
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[7768b8d] | 250 |
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[b388ee81] | 251 | void ready_mutate_unlock( uint_fast32_t /* value returned by lock */ );
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[7768b8d] | 252 |
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[b798713] | 253 | //=======================================================================
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| 254 | // Ready-Queue API
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[64a7146] | 255 | //-----------------------------------------------------------------------
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| 256 | // pop thread from the ready queue of a cluster
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| 257 | // returns 0p if empty
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| 258 | __attribute__((hot)) bool query(struct cluster * cltr);
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| 259 |
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[dca5802] | 260 | //-----------------------------------------------------------------------
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| 261 | // push thread onto a ready queue for a cluster
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| 262 | // returns true if the list was previously empty, false otherwise
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[504a7dc] | 263 | __attribute__((hot)) bool push(struct cluster * cltr, struct $thread * thrd);
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[dca5802] | 264 |
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| 265 | //-----------------------------------------------------------------------
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| 266 | // pop thread from the ready queue of a cluster
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| 267 | // returns 0p if empty
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[1eb239e4] | 268 | // May return 0p spuriously
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[504a7dc] | 269 | __attribute__((hot)) struct $thread * pop(struct cluster * cltr);
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[dca5802] | 270 |
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[1eb239e4] | 271 | //-----------------------------------------------------------------------
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| 272 | // pop thread from the ready queue of a cluster
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| 273 | // returns 0p if empty
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| 274 | // guaranteed to find any threads added before this call
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| 275 | __attribute__((hot)) struct $thread * pop_slow(struct cluster * cltr);
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| 276 |
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[13c5e19] | 277 | //-----------------------------------------------------------------------
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| 278 | // remove thread from the ready queue of a cluster
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| 279 | // returns bool if it wasn't found
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| 280 | bool remove_head(struct cluster * cltr, struct $thread * thrd);
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| 281 |
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[dca5802] | 282 | //-----------------------------------------------------------------------
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| 283 | // Increase the width of the ready queue (number of lanes) by 4
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[320ec6fc] | 284 | void ready_queue_grow (struct cluster * cltr, int target);
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[dca5802] | 285 |
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| 286 | //-----------------------------------------------------------------------
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| 287 | // Decrease the width of the ready queue (number of lanes) by 4
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[320ec6fc] | 288 | void ready_queue_shrink(struct cluster * cltr, int target);
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[b798713] | 289 |
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[de94a60] | 290 |
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[75f3522] | 291 | // Local Variables: //
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| 292 | // mode: c //
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| 293 | // tab-width: 4 //
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[4aa2fb2] | 294 | // End: //
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