source: trunk/kernel/kern/core.c @ 101

Last change on this file since 101 was 101, checked in by alain, 5 years ago

euh...

File size: 5.1 KB
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1/*
2 * core.c - core descriptor access function.
3 *
4 * Author  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *         Alain Greiner (2016,2017)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH.is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <kernel_config.h>
26#include <hal_types.h>
27#include <hal_special.h>
28#include <errno.h>
29#include <printk.h>
30#include <thread.h>
31#include <chdev.h>
32#include <dev_icu.h>
33#include <rpc.h>
34#include <cluster.h>
35#include <kmem.h>
36#include <dqdt.h>
37#include <core.h>
38
39/////////////////////////////////
40void core_init( core_t    * core,
41                lid_t       lid,
42                gid_t       gid )
43{
44        core->lid               = lid;
45        core->gid               = gid;
46        core->cycles            = 0;
47        core->time_stamp        = 0;
48        core->ticks_nr          = 0;
49        core->ticks_period      = CONFIG_SCHED_TICK_PERIOD;
50        core->usage             = 0;
51        core->spurious_irqs     = 0;
52        core->rpc_threads       = 0;
53
54        list_root_init( &core->rpc_free_list );
55
56        core->thread_rpc        = NULL;
57        core->thread_idle       = NULL;
58        core->fpu_owner         = NULL;
59        core->rand_last         =  hal_get_cycles() & 0xFFF;
60
61        sched_init( core );
62}
63
64//////////////////////////////////////////////
65inline uint32_t core_get_rand( core_t * core )
66{
67        uint32_t value  = ((core->rand_last * CONFIG_RDNG_PARAM_A) +
68                            CONFIG_RDNG_PARAM_C) ^ (hal_get_cycles() & 0xFFF);
69        core->rand_last = value;
70        return value;
71}
72
73////////////////////////////////////
74void core_get_time( core_t   * core,
75                    uint32_t * tm_s, 
76                    uint32_t * tm_us )
77{
78        uint64_t cycles = hal_get_cycles();
79
80        *tm_s  = (cycles / CONFIG_CYCLES_PER_MS);
81        *tm_us = (cycles % CONFIG_CYCLES_PER_MS) / (CONFIG_CYCLES_PER_MS / 1000000);
82}
83
84//////////////////////////////////////
85void core_time_update( core_t * core )
86{
87        uint32_t elapsed;
88        uint32_t ticks_nr   = core->ticks_nr;
89        uint64_t cycles     = core->cycles;
90        uint32_t time_stamp = core->time_stamp;
91        uint32_t time_now   = hal_get_cycles();
92
93        // compute number of elapsed cycles taking into account 32 bits register wrap
94        if( time_now < time_stamp ) elapsed = (0xFFFFFFFF - time_stamp) + time_now;
95        else                        elapsed = time_now - time_stamp;
96
97        cycles  += elapsed;
98        ticks_nr = elapsed / core->ticks_period;
99
100        core->time_stamp     = time_now;
101        core->cycles         = cycles + elapsed;
102        core->ticks_nr       = ticks_nr + (elapsed / core->ticks_period);
103        hal_wbflush();
104}
105
106////////////////////////////////
107void core_clock( core_t * core )
108{
109        uint32_t ticks;
110
111        // update cycles and ticks counter
112        core_time_update( core );
113
114        // get current ticks number
115        ticks = core->ticks_nr;
116
117        // handle pending alarms TODO ??? [AG]
118        // alarm_clock( &core->alarm_mgr , ticks );
119
120        // handle scheduler TODO  improve the scheduling condition ... AG
121        if( (ticks % 10) == 0 ) sched_yield();
122
123        // update DQDT TODO  This update should depend on the cluster identifier,
124        // to avoid simultaneous updates from various clusters ... AG
125        if( ((ticks % CONFIG_DQDT_PERIOD) == 0) && (core->lid == 0) ) dqdt_global_update();
126}
127
128////////////////////////////////////////
129void core_compute_stats( core_t * core )
130{
131        thread_t * idle  = core->thread_idle;
132        uint32_t   ticks = core->ticks_nr;
133
134        uint32_t   idle_percent;
135        uint32_t   busy_percent;
136        uint32_t   usage;
137
138        // compute cumulated usage
139        ticks         = (ticks) ? ticks : 1;
140        idle_percent  = (idle->ticks_nr * 100) / ticks;
141        idle_percent  = (idle_percent > 100) ? 100 : idle_percent;
142        busy_percent  = 100 - idle_percent;
143        usage         = (busy_percent + core->usage) / 2;
144
145        // update core descriptor
146        core->usage = usage;
147        hal_wbflush();
148
149#if CONFIG_SHOW_CPU_USAGE
150        printk(INFO, "INFO: core %d in cluster %x : busy_percent = %d / cumulated_usage = %d\n",
151               core->lid, local_cxy , busy_percent , usage );
152#endif
153
154        core->ticks_nr = 0;
155        idle->ticks_nr = 0;
156}
157
158/////////////////////////////////////
159void core_reset_stats( core_t * core )
160{
161        core_time_update(core);
162
163        core->ticks_nr              = 0;
164        core->usage                 = 0;
165        core->thread_idle->ticks_nr = 0;
166        hal_wbflush();
167}
168
169///////////////////////////////////////////////////
170void core_set_irq_vector_entry( core_t   * core,
171                                uint32_t   irq_type,
172                                uint32_t   irq_id,
173                                chdev_t  * chdev )
174{
175        if     ( irq_type == WTI_TYPE ) core->wti_vector[irq_id] = chdev;
176        else if( irq_type == HWI_TYPE ) core->hwi_vector[irq_id] = chdev;
177        else                            core->pti_vector[irq_id] = chdev;
178}
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