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