source: trunk/kernel/syscalls/sys_barrier.c @ 637

Last change on this file since 637 was 637, checked in by alain, 3 years ago

Introduce the non-standard pthread_parallel_create() system call
and re-write the <fft> and <sort> applications to improve the
intrinsic paralelism in applications.

File size: 6.1 KB
Line 
1/*
2 * sys_barrier.c - Access a POSIX barrier.
3 *
4 * authors       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_special.h>
26#include <hal_uspace.h>
27#include <hal_vmm.h>
28#include <errno.h>
29#include <thread.h>
30#include <printk.h>
31#include <vmm.h>
32#include <syscalls.h>
33#include <remote_barrier.h>
34
35//////////////////////////////////////////////////////
36static char * sys_barrier_op_str( uint32_t operation )
37{
38        if     ( operation == BARRIER_INIT    ) return "INIT";
39        else if( operation == BARRIER_DESTROY ) return "DESTROY";
40        else if( operation == BARRIER_WAIT    ) return "WAIT";
41        else                                    return "undefined";
42}
43
44//////////////////////////////////
45int sys_barrier( intptr_t   vaddr,
46                 uint32_t   operation,
47                 uint32_t   count,
48                 intptr_t   attr )   
49{
50        error_t                 error;
51    vseg_t                * vseg;
52    pthread_barrierattr_t   k_attr;
53
54    thread_t  * this    = CURRENT_THREAD;
55    process_t * process = this->process;
56
57#if (DEBUG_SYS_BARRIER || CONFIG_INSTRUMENTATION_SYSCALLS)
58uint64_t     tm_start = hal_get_cycles();
59#endif
60
61#if DEBUG_SYS_BARRIER
62if( DEBUG_SYS_BARRIER < tm_start )
63printk("\n[%s] thread[%x,%x] enters for %s / count %d / cycle %d\n",
64__FUNCTION__, process->pid, this->trdid, sys_barrier_op_str(operation), count,
65(uint32_t)tm_start );
66#endif
67
68    // check vaddr in user vspace
69        error = vmm_get_vseg( process , vaddr , &vseg );
70        if( error )
71    {
72
73#if DEBUG_SYSCALLS_ERROR
74printk("\n[ERROR] in %s for %s : unmapped barrier %x / thread[%x,%x]\n",
75__FUNCTION__, sys_barrier_op_str(operation), vaddr, process->pid, this->trdid );
76#endif
77        this->errno = error;
78        return -1;
79    }
80
81    // execute requested operation
82        switch( operation )
83        {
84        //////////////////
85            case BARRIER_INIT:
86        {
87            if( attr != 0 )   // QDT barrier required
88            {
89                error = vmm_get_vseg( process , attr , &vseg );
90                if( error )
91                {
92
93#if DEBUG_SYSCALLS_ERROR
94printk("\n[ERROR] in %s for INIT : unmapped barrier attributes %x / thread[%x,%x]\n",
95__FUNCTION__ , attr , process->pid , this->trdid );
96#endif
97                    this->errno = EINVAL;
98                    return -1;
99                }
100 
101                // copy barrier attributes into kernel space
102                hal_copy_from_uspace( XPTR( local_cxy , &k_attr ),
103                                      (void *)attr,
104                                      sizeof(pthread_barrierattr_t) );
105
106                if ( count != k_attr.x_size * k_attr.y_size *k_attr.nthreads ) 
107                {
108
109#if DEBUG_SYSCALLS_ERROR
110printk("\n[ERROR] in %s for INIT : count (%d) != x_size (%d) * y_size (%d) * nthreads (%x)\n",
111__FUNCTION__, count, k_attr.x_size, k_attr.y_size, k_attr.nthreads );
112#endif
113                    this->errno = EINVAL;
114                    return -1;
115                }
116 
117
118                // call relevant system function
119                error = generic_barrier_create( vaddr , count , &k_attr );
120            }
121            else               // simple barrier required
122            {
123                error = generic_barrier_create( vaddr , count , NULL );
124            }
125
126                    if( error )
127            {
128
129#if DEBUG_SYSCALLS_ERROR
130printk("\n[ERROR] in %s for INIT : cannot create barrier %x / thread[%x,%x]\n",
131__FUNCTION__ , vaddr , process->pid , this->trdid );
132#endif
133                this->errno = ENOMEM;
134                return -1;
135            }
136                        break;
137        }
138        //////////////////
139            case BARRIER_WAIT:
140        {
141            xptr_t barrier_xp = generic_barrier_from_ident( vaddr );
142
143            if( barrier_xp == XPTR_NULL )     // user error
144            {
145
146#if DEBUG_SYSCALLS_ERROR
147printk("\n[ERROR] in %s for WAIT : barrier %x not registered / thread[%x,%x]\n",
148__FUNCTION__ , (intptr_t)vaddr , process->pid, this->trdid );
149#endif
150                this->errno = EINVAL;
151                return -1;
152            }
153            else                          // success
154            {
155                generic_barrier_wait( barrier_xp ); 
156            }
157            break;
158        }
159        /////////////////////
160            case BARRIER_DESTROY:
161        {
162            xptr_t barrier_xp = generic_barrier_from_ident( vaddr );
163
164            if( barrier_xp == XPTR_NULL )     // user error
165            {
166
167#if DEBUG_SYSCALLS_ERROR
168printk("\n[ERROR] in %s for DESTROY : barrier %x not registered / thread[%x,%x]\n",
169__FUNCTION__ , (intptr_t)vaddr , process->pid, this->trdid );
170#endif
171                this->errno = EINVAL;
172                return -1;
173            }
174            else                          // success
175            {
176                generic_barrier_destroy( barrier_xp ); 
177            }
178            break;
179        }
180        ////////
181        default:
182        {
183            assert ( false, "illegal operation type <%x>", operation );
184        }
185        }  // end switch
186
187    hal_fence();
188
189#if (DEBUG_SYS_BARRIER || CONFIG_INSTRUMENTATION_SYSCALLS)
190uint64_t     tm_end = hal_get_cycles();
191#endif
192
193#if DEBUG_SYS_BARRIER
194if( DEBUG_SYS_BARRIER < tm_end )
195printk("\n[%s] thread[%x,%x] exit for %s / cycle %d\n",
196__FUNCTION__, process->pid, this->trdid, sys_barrier_op_str(operation), (uint32_t)tm_end );
197#endif
198
199#if CONFIG_INSTRUMENTATION_SYSCALLS
200hal_atomic_add( &syscalls_cumul_cost[SYS_BARRIER] , tm_end - tm_start );
201hal_atomic_add( &syscalls_occurences[SYS_BARRIER] , 1 );
202#endif
203
204        return 0;
205
206}  // end sys_barrier()
207
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