[639] | 1 | /* |
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| 2 | * sys_get_best_core.c - Kernel function implementing the "get_best_core" syscall. |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016,2017,2018,2019) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <hal_kernel_types.h> |
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| 25 | #include <hal_uspace.h> |
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| 26 | #include <hal_vmm.h> |
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| 27 | #include <hal_special.h> |
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| 28 | #include <errno.h> |
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| 29 | #include <core.h> |
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| 30 | #include <thread.h> |
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| 31 | #include <process.h> |
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| 32 | #include <vmm.h> |
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| 33 | #include <printk.h> |
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| 34 | |
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| 35 | #include <syscalls.h> |
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| 36 | |
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| 37 | /////////////////////////////////////////// |
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| 38 | int sys_get_best_core( uint32_t base_cxy, |
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| 39 | uint32_t level, |
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| 40 | uint32_t * cxy, |
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| 41 | uint32_t * lid ) |
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| 42 | { |
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| 43 | int ret; |
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| 44 | vseg_t * vseg; |
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| 45 | uint32_t k_cxy; |
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| 46 | uint32_t k_lid; |
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| 47 | |
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| 48 | thread_t * this = CURRENT_THREAD; |
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| 49 | process_t * process = this->process; |
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| 50 | |
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| 51 | #if (DEBUG_SYS_GET_BEST_CORE || CONFIG_INSTRUMENTATION_SYSCALLS) |
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| 52 | uint64_t tm_start = hal_get_cycles(); |
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| 53 | #endif |
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| 54 | |
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| 55 | #if DEBUG_SYS_GET_BEST_CORE |
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| 56 | if( DEBUG_SYS_GET_BEST_CORE < tm_start ) |
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| 57 | printk("\n[%s] thread[%x,%x] enter / base_cxy %x / level %d / cycle %d\n", |
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| 58 | __FUNCTION__, process->pid, this->trdid, base_cxy, level, (uint32_t)tm_start ); |
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| 59 | #endif |
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| 60 | |
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| 61 | // check <cxy> buffer in user space |
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| 62 | if( vmm_get_vseg( process , (intptr_t)cxy , &vseg ) ) |
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| 63 | { |
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| 64 | |
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| 65 | #if DEBUG_SYSCALLS_ERROR |
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| 66 | printk("\n[ERROR] in %s : cxy buffer %x unmapped / thread %x / process %x\n", |
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| 67 | __FUNCTION__ , (intptr_t)cxy , this->trdid , process->pid ); |
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| 68 | #endif |
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| 69 | this->errno = EINVAL; |
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| 70 | return -1; |
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| 71 | } |
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| 72 | |
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| 73 | // check <lid> buffer in user space |
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| 74 | if( vmm_get_vseg( process , (intptr_t)lid , &vseg ) ) |
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| 75 | { |
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| 76 | |
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| 77 | #if DEBUG_SYSCALLS_ERROR |
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| 78 | printk("\n[ERROR] in %s : lid buffer unmapped %x / thread %x / process %x\n", |
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| 79 | __FUNCTION__ , (intptr_t)lid , this->trdid , process->pid ); |
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| 80 | #endif |
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| 81 | this->errno = EINVAL; |
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| 82 | return -1; |
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| 83 | } |
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| 84 | |
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| 85 | // check level argument |
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| 86 | if( level > 5 ) |
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| 87 | { |
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| 88 | |
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| 89 | #if DEBUG_SYSCALLS_ERROR |
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| 90 | printk("\n[ERROR] in %s : level argument %d too large / thread %x / process %x\n", |
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| 91 | __FUNCTION__ , level , this->trdid , process->pid ); |
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| 92 | #endif |
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| 93 | this->errno = EINVAL; |
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| 94 | return -1; |
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| 95 | } |
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| 96 | |
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| 97 | // get extended pointer on the macro-cluster root node |
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| 98 | xptr_t root_xp = dqdt_get_root( base_cxy , level ); |
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| 99 | |
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| 100 | if( root_xp == XPTR_NULL ) // macro-cluster undefined |
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| 101 | { |
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| 102 | |
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| 103 | #if DEBUG_SYS_GET_BEST_CORE |
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| 104 | printk("\n[%s] thread[%x,%x] do nothing : macro cluster undefined\n", |
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| 105 | __FUNCTION__, process->pid, this->trdid ); |
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| 106 | #endif |
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| 107 | k_lid = -1; |
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| 108 | k_cxy = -1; |
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| 109 | ret = 1; |
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| 110 | } |
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| 111 | else // macro-cluster exist |
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| 112 | { |
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| 113 | k_cxy = (uint32_t)dqdt_get_cluster_for_thread( root_xp ); |
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| 114 | k_lid = (uint32_t)cluster_select_local_core( k_cxy ); |
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| 115 | ret = 0; |
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| 116 | |
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| 117 | #if DEBUG_SYS_GET_BEST_CORE |
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| 118 | printk("\n[%s] thread[%x,%x] succeed : root_cxy %x / best_cluster %x / best_lid %d\n", |
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| 119 | __FUNCTION__, process->pid, this->trdid, GET_CXY( root_xp ), k_cxy, k_lid ); |
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| 120 | #endif |
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| 121 | |
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| 122 | } |
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| 123 | |
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| 124 | // copy to user space |
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| 125 | hal_copy_to_uspace( cxy, |
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| 126 | XPTR( local_cxy , &k_cxy ), |
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| 127 | sizeof(uint32_t) ); |
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| 128 | |
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| 129 | hal_copy_to_uspace( lid, |
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| 130 | XPTR( local_cxy , &k_lid ), |
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| 131 | sizeof(uint32_t) ); |
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| 132 | |
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| 133 | #if (DEBUG_SYS_GET_BEST_CORE || CONFIG_INSTRUMENTATION_SYSCALLS) |
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| 134 | uint64_t tm_end = hal_get_cycles(); |
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| 135 | #endif |
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| 136 | |
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| 137 | #if DEBUG_SYS_GET_BEST_CORE |
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| 138 | if( DEBUG_SYS_GET_BEST_CORE < tm_end ) |
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| 139 | printk("\n[%s] thread[%x,%x] exit / cycle %d\n", |
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| 140 | __FUNCTION__ , process->pid, this->trdid, (uint32_t)tm_end ); |
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| 141 | #endif |
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| 142 | |
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| 143 | #if CONFIG_INSTRUMENTATION_SYSCALLS |
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| 144 | hal_atomic_add( &syscalls_cumul_cost[SYS_GET_BEST_CORE] , tm_end - tm_start ); |
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| 145 | hal_atomic_add( &syscalls_occurences[SYS_GET_BEST_CORE] , 1 ); |
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| 146 | #endif |
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| 147 | |
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| 148 | return ret; |
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| 149 | |
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| 150 | } // end sys_get_best_core() |
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