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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 */ |