source: trunk/kernel/kern/core.c @ 19

Last change on this file since 19 was 19, checked in by max@…, 5 years ago

cosmetic, and a few typos

File size: 5.9 KB
Line 
1/*
2 * core.c - core descriptor access function.
3 *
4 * Author  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *         Mohamed Lamine Karaoui (2015)
6 *         Alain Greiner (2016)
7 *
8 * Copyright (c) UPMC Sorbonne Universites
9 *
10 * This file is part of ALMOS-MKH.
11 *
12 * ALMOS-MKH.is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2.0 of the License.
15 *
16 * ALMOS-MKH is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <kernel_config.h>
27#include <hal_types.h>
28#include <hal_special.h>
29#include <errno.h>
30#include <printk.h>
31#include <thread.h>
32#include <chdev.h>
33#include <dev_icu.h>
34#include <rpc.h>
35#include <cluster.h>
36#include <kmem.h>
37#include <dqdt.h>
38#include <core.h>
39
40// TODO #include <sysfs.h>
41
42/////////////////////////////////
43void core_init( core_t    * core,
44                lid_t       lid,
45                gid_t       gid )
46{
47        core->lid               = lid;
48        core->gid               = gid;
49        core->cycles            = 0;
50        core->time_stamp        = 0;
51        core->ticks_nr          = 0;
52        core->ticks_period      = CONFIG_SCHED_TICK_PERIOD;
53        core->usage             = 0;
54        core->spurious_irqs     = 0;
55        core->rpc_threads       = 0;
56
57        rpc_fifo_init( &core->rpc_fifo );
58
59        list_root_init( &core->rpc_free_list );
60
61        core->thread_rpc        = NULL;
62        core->thread_idle       = NULL;
63        core->fpu_owner         = NULL;
64        core->rand_last         =  hal_time_stamp() & 0xFFF;
65
66        sched_init( core );
67}
68
69//////////////////////////////////////////////
70inline uint32_t core_get_rand( core_t * core )
71{
72        uint32_t value  = ((core->rand_last * CONFIG_RDNG_PARAM_A) +
73                            CONFIG_RDNG_PARAM_C) ^ (hal_time_stamp() & 0xFFF);
74        core->rand_last = value;
75        return value;
76}
77
78////////////////////////////////////////////////
79inline uint64_t core_get_cycles( core_t * core )
80{
81        uint32_t elapsed;
82        uint64_t cycles;
83        uint32_t time_stamp = core->time_stamp;
84        uint32_t time_now   = hal_time_stamp();
85
86        // compute number of elapsed cycles, taking into account 32 bits register wrap
87        if(time_now < time_stamp) elapsed = (0xFFFFFFFF - time_stamp) + time_now;
88        else                      elapsed = (time_now - time_stamp);
89
90        cycles = core->cycles + elapsed;
91
92        // update core time
93        core->time_stamp = time_now;
94        core->cycles     = cycles;
95        hal_wbflush();
96
97        return cycles;
98}
99
100////////////////////////////////////
101void core_get_time( core_t   * core,
102                    uint32_t * tm_ms,
103                    uint32_t * tm_us )
104{
105        // uint64_t cycles = core_get_cycles( core );
106
107        // TODO ces deux ligne ne compilent pas : "undefined referenc to __udivdi3"
108
109        // *tm_ms = (cycles / CONFIG_CYCLES_PER_MS);
110        // *tm_us = (cycles % CONFIG_CYCLES_PER_MS) / (CONFIG_CYCLES_PER_MS / 1000000);
111
112        printk("\n[PANIC] in %s : not implemented yet\n", __FUNCTION__ );
113}
114
115//////////////////////////////////////
116void core_time_update( core_t * core )
117{
118        uint32_t elapsed;
119        uint32_t ticks_nr   = core->ticks_nr;
120        uint64_t cycles     = core->cycles;
121        uint32_t time_stamp = core->time_stamp;
122        uint32_t time_now   = hal_time_stamp();
123
124        // compute number of elapsed cycles taking into account 32 bits register wrap
125        if( time_now < time_stamp ) elapsed = (0xFFFFFFFF - time_stamp) + time_now;
126        else                        elapsed = time_now - time_stamp;
127
128        cycles  += elapsed;
129        ticks_nr = elapsed / core->ticks_period;
130
131        core->time_stamp     = time_now;
132        core->cycles         = cycles + elapsed;
133        core->ticks_nr       = ticks_nr + (elapsed / core->ticks_period);
134        hal_wbflush();
135}
136
137////////////////////////////////
138void core_clock( core_t * core )
139{
140        uint32_t ticks;
141
142        // update cycles and ticks counter
143        core_time_update( core );
144
145        // get current ticks number
146        ticks = core->ticks_nr;
147
148        // handle pending alarms TODO ??? [AG]
149        // alarm_clock( &core->alarm_mgr , ticks );
150
151        // handle scheduler TODO  improve the scheduling condition ... AG
152        if( (ticks % 10) == 0 ) sched_yield();
153
154        // update DQDT TODO  This update should depend on the cluster identifier,
155        // to avoid simultaneous updates from various clusters ... AG
156        if( ((ticks % CONFIG_DQDT_PERIOD) == 0) && (core->lid == 0) ) dqdt_global_update();
157}
158
159////////////////////////////////////////
160void core_compute_stats( core_t * core )
161{
162        thread_t * idle  = core->thread_idle;
163        uint32_t   ticks = core->ticks_nr;
164
165        uint32_t   idle_percent;
166        uint32_t   busy_percent;
167        uint32_t   usage;
168
169        // compute cumulated usage
170        ticks         = (ticks) ? ticks : 1;
171        idle_percent  = (idle->ticks_nr * 100) / ticks;
172        idle_percent  = (idle_percent > 100) ? 100 : idle_percent;
173        busy_percent  = 100 - idle_percent;
174        usage         = (busy_percent + core->usage) / 2;
175
176        // update core descriptor
177        core->usage = usage;
178        hal_wbflush();
179
180#if CONFIG_SHOW_CPU_USAGE
181        printk(INFO, "INFO: core %d in cluster %x : busy_percent = %d / cumulated_usage = %d\n",
182               core->lid, local_cxy , busy_percent , usage );
183#endif
184
185        core->ticks_nr = 0;
186        idle->ticks_nr = 0;
187}
188
189/////////////////////////////////////
190void core_reset_stats( core_t * core )
191{
192        core_time_update(core);
193
194        core->ticks_nr              = 0;
195        core->usage                 = 0;
196        core->thread_idle->ticks_nr = 0;
197        hal_wbflush();
198}
199
200///////////////////////////////////////////////////
201void core_set_irq_vector_entry( core_t   * core,
202                                uint32_t   irq_type,
203                                uint32_t   irq_id,
204                                chdev_t  * chdev )
205{
206        if     ( irq_type == WTI_TYPE ) core->wti_vector[irq_id] = chdev;
207        else if( irq_type == HWI_TYPE ) core->hwi_vector[irq_id] = chdev;
208        else                            core->pti_vector[irq_id] = chdev;
209}
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