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