Subversion Repositories HelenOS

Rev

Rev 1780 | Rev 1904 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1757 jermar 29
/** @addtogroup genericmm
1702 cejka 30
 * @{
31
 */
32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
1248 jermar 35
 * @brief   Generic TLB shootdown algorithm.
1297 jermar 36
 *
37
 * The algorithm implemented here is based on the CMU TLB shootdown
38
 * algorithm and is further simplified (e.g. all CPUs receive all TLB
39
 * shootdown messages).
1248 jermar 40
 */
41
 
1 jermar 42
#include <mm/tlb.h>
1002 jermar 43
#include <mm/asid.h>
389 jermar 44
#include <arch/mm/tlb.h>
7 jermar 45
#include <smp/ipi.h>
5 jermar 46
#include <synch/spinlock.h>
47
#include <typedefs.h>
1104 jermar 48
#include <atomic.h>
7 jermar 49
#include <arch/interrupt.h>
5 jermar 50
#include <config.h>
31 jermar 51
#include <arch.h>
594 jermar 52
#include <panic.h>
1002 jermar 53
#include <debug.h>
1 jermar 54
 
1002 jermar 55
/**
56
 * This lock is used for synchronisation between sender and
57
 * recipients of TLB shootdown message. It must be acquired
58
 * before CPU structure lock.
59
 */
623 jermar 60
SPINLOCK_INITIALIZE(tlblock);
5 jermar 61
 
62
void tlb_init(void)
1 jermar 63
{
569 jermar 64
    tlb_arch_init();
1 jermar 65
}
5 jermar 66
 
458 decky 67
#ifdef CONFIG_SMP
1002 jermar 68
 
69
/** Send TLB shootdown message.
70
 *
71
 * This function attempts to deliver TLB shootdown message
72
 * to all other processors.
73
 *
74
 * This function must be called with interrupts disabled.
75
 *
76
 * @param type Type describing scope of shootdown.
77
 * @param asid Address space, if required by type.
78
 * @param page Virtual page address, if required by type.
79
 * @param count Number of pages, if required by type.
80
 */
1780 jermar 81
void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, uintptr_t page, count_t count)
5 jermar 82
{
31 jermar 83
    int i;
84
 
85
    CPU->tlb_active = 0;
5 jermar 86
    spinlock_lock(&tlblock);
727 jermar 87
 
1002 jermar 88
    for (i = 0; i < config.cpu_count; i++) {
89
        cpu_t *cpu;
90
 
91
        if (i == CPU->id)
92
            continue;
93
 
94
        cpu = &cpus[i];
95
        spinlock_lock(&cpu->lock);
96
        if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {
97
            /*
98
             * The message queue is full.
99
             * Erase the queue and store one TLB_INVL_ALL message.
100
             */
101
            cpu->tlb_messages_count = 1;
102
            cpu->tlb_messages[0].type = TLB_INVL_ALL;
103
            cpu->tlb_messages[0].asid = ASID_INVALID;
104
            cpu->tlb_messages[0].page = 0;
105
            cpu->tlb_messages[0].count = 0;
106
        } else {
107
            /*
108
             * Enqueue the message.
109
             */
110
            cpu->tlb_messages[cpu->tlb_messages_count].type = type;
111
            cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;
112
            cpu->tlb_messages[cpu->tlb_messages_count].page = page;
113
            cpu->tlb_messages[cpu->tlb_messages_count].count = count;
114
            cpu->tlb_messages_count++;
115
        }
116
        spinlock_unlock(&cpu->lock);
117
    }
740 jermar 118
 
6 jermar 119
    tlb_shootdown_ipi_send();
727 jermar 120
 
31 jermar 121
busy_wait: 
1002 jermar 122
    for (i = 0; i < config.cpu_count; i++)
31 jermar 123
        if (cpus[i].tlb_active)
124
            goto busy_wait;
5 jermar 125
}
126
 
1002 jermar 127
/** Finish TLB shootdown sequence. */
6 jermar 128
void tlb_shootdown_finalize(void)
5 jermar 129
{
130
    spinlock_unlock(&tlblock);
31 jermar 131
    CPU->tlb_active = 1;
5 jermar 132
}
133
 
7 jermar 134
void tlb_shootdown_ipi_send(void)
135
{
136
    ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
137
}
138
 
1002 jermar 139
/** Receive TLB shootdown message. */
6 jermar 140
void tlb_shootdown_ipi_recv(void)
5 jermar 141
{
1002 jermar 142
    tlb_invalidate_type_t type;
143
    asid_t asid;
1780 jermar 144
    uintptr_t page;
1002 jermar 145
    count_t count;
146
    int i;
147
 
1008 jermar 148
    ASSERT(CPU);
149
 
31 jermar 150
    CPU->tlb_active = 0;
5 jermar 151
    spinlock_lock(&tlblock);
152
    spinlock_unlock(&tlblock);
1002 jermar 153
 
154
    spinlock_lock(&CPU->lock);
155
    ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);
156
 
157
    for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {
158
        type = CPU->tlb_messages[i].type;
159
        asid = CPU->tlb_messages[i].asid;
160
        page = CPU->tlb_messages[i].page;
161
        count = CPU->tlb_messages[i].count;
162
 
163
        switch (type) {
164
            case TLB_INVL_ALL:
165
            tlb_invalidate_all();
166
            break;
167
            case TLB_INVL_ASID:
168
            tlb_invalidate_asid(asid);
169
            break;
170
            case TLB_INVL_PAGES:
171
                ASSERT(count);
172
            tlb_invalidate_pages(asid, page, count);
173
            break;
174
            default:
175
            panic("unknown type (%d)\n", type);
176
            break;
177
        }
178
        if (type == TLB_INVL_ALL)
179
            break;
180
    }
181
 
182
    spinlock_unlock(&CPU->lock);
31 jermar 183
    CPU->tlb_active = 1;
5 jermar 184
}
1002 jermar 185
 
458 decky 186
#endif /* CONFIG_SMP */
1702 cejka 187
 
1757 jermar 188
/** @}
1702 cejka 189
 */