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| Rev | Author | Line No. | Line |
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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 | |||
| 29 | #include <mm/tlb.h> |
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| 1002 | jermar | 30 | #include <mm/asid.h> |
| 389 | jermar | 31 | #include <arch/mm/tlb.h> |
| 7 | jermar | 32 | #include <smp/ipi.h> |
| 5 | jermar | 33 | #include <synch/spinlock.h> |
| 34 | #include <typedefs.h> |
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| 1104 | jermar | 35 | #include <atomic.h> |
| 7 | jermar | 36 | #include <arch/interrupt.h> |
| 5 | jermar | 37 | #include <config.h> |
| 31 | jermar | 38 | #include <arch.h> |
| 594 | jermar | 39 | #include <panic.h> |
| 1002 | jermar | 40 | #include <debug.h> |
| 1 | jermar | 41 | |
| 1002 | jermar | 42 | /** |
| 43 | * This lock is used for synchronisation between sender and |
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| 44 | * recipients of TLB shootdown message. It must be acquired |
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| 45 | * before CPU structure lock. |
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| 46 | */ |
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| 623 | jermar | 47 | SPINLOCK_INITIALIZE(tlblock); |
| 5 | jermar | 48 | |
| 49 | void tlb_init(void) |
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| 1 | jermar | 50 | { |
| 569 | jermar | 51 | tlb_arch_init(); |
| 1 | jermar | 52 | } |
| 5 | jermar | 53 | |
| 458 | decky | 54 | #ifdef CONFIG_SMP |
| 1002 | jermar | 55 | |
| 56 | /** Send TLB shootdown message. |
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| 57 | * |
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| 58 | * This function attempts to deliver TLB shootdown message |
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| 59 | * to all other processors. |
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| 60 | * |
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| 61 | * This function must be called with interrupts disabled. |
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| 62 | * |
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| 63 | * @param type Type describing scope of shootdown. |
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| 64 | * @param asid Address space, if required by type. |
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| 65 | * @param page Virtual page address, if required by type. |
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| 66 | * @param count Number of pages, if required by type. |
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| 67 | */ |
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| 68 | void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count) |
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| 5 | jermar | 69 | { |
| 31 | jermar | 70 | int i; |
| 71 | |||
| 72 | CPU->tlb_active = 0; |
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| 5 | jermar | 73 | spinlock_lock(&tlblock); |
| 727 | jermar | 74 | |
| 1002 | jermar | 75 | for (i = 0; i < config.cpu_count; i++) { |
| 76 | cpu_t *cpu; |
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| 77 | |||
| 78 | if (i == CPU->id) |
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| 79 | continue; |
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| 80 | |||
| 81 | cpu = &cpus[i]; |
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| 82 | spinlock_lock(&cpu->lock); |
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| 83 | if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) { |
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| 84 | /* |
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| 85 | * The message queue is full. |
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| 86 | * Erase the queue and store one TLB_INVL_ALL message. |
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| 87 | */ |
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| 88 | cpu->tlb_messages_count = 1; |
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| 89 | cpu->tlb_messages[0].type = TLB_INVL_ALL; |
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| 90 | cpu->tlb_messages[0].asid = ASID_INVALID; |
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| 91 | cpu->tlb_messages[0].page = 0; |
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| 92 | cpu->tlb_messages[0].count = 0; |
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| 93 | } else { |
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| 94 | /* |
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| 95 | * Enqueue the message. |
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| 96 | */ |
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| 97 | cpu->tlb_messages[cpu->tlb_messages_count].type = type; |
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| 98 | cpu->tlb_messages[cpu->tlb_messages_count].asid = asid; |
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| 99 | cpu->tlb_messages[cpu->tlb_messages_count].page = page; |
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| 100 | cpu->tlb_messages[cpu->tlb_messages_count].count = count; |
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| 101 | cpu->tlb_messages_count++; |
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| 102 | } |
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| 103 | spinlock_unlock(&cpu->lock); |
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| 104 | } |
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| 740 | jermar | 105 | |
| 6 | jermar | 106 | tlb_shootdown_ipi_send(); |
| 727 | jermar | 107 | |
| 31 | jermar | 108 | busy_wait: |
| 1002 | jermar | 109 | for (i = 0; i < config.cpu_count; i++) |
| 31 | jermar | 110 | if (cpus[i].tlb_active) |
| 111 | goto busy_wait; |
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| 5 | jermar | 112 | } |
| 113 | |||
| 1002 | jermar | 114 | /** Finish TLB shootdown sequence. */ |
| 6 | jermar | 115 | void tlb_shootdown_finalize(void) |
| 5 | jermar | 116 | { |
| 117 | spinlock_unlock(&tlblock); |
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| 31 | jermar | 118 | CPU->tlb_active = 1; |
| 5 | jermar | 119 | } |
| 120 | |||
| 7 | jermar | 121 | void tlb_shootdown_ipi_send(void) |
| 122 | { |
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| 123 | ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI); |
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| 124 | } |
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| 125 | |||
| 1002 | jermar | 126 | /** Receive TLB shootdown message. */ |
| 6 | jermar | 127 | void tlb_shootdown_ipi_recv(void) |
| 5 | jermar | 128 | { |
| 1002 | jermar | 129 | tlb_invalidate_type_t type; |
| 130 | asid_t asid; |
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| 131 | __address page; |
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| 132 | count_t count; |
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| 133 | int i; |
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| 134 | |||
| 1008 | jermar | 135 | ASSERT(CPU); |
| 136 | |||
| 31 | jermar | 137 | CPU->tlb_active = 0; |
| 5 | jermar | 138 | spinlock_lock(&tlblock); |
| 139 | spinlock_unlock(&tlblock); |
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| 1002 | jermar | 140 | |
| 141 | spinlock_lock(&CPU->lock); |
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| 142 | ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN); |
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| 143 | |||
| 144 | for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) { |
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| 145 | type = CPU->tlb_messages[i].type; |
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| 146 | asid = CPU->tlb_messages[i].asid; |
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| 147 | page = CPU->tlb_messages[i].page; |
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| 148 | count = CPU->tlb_messages[i].count; |
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| 149 | |||
| 150 | switch (type) { |
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| 151 | case TLB_INVL_ALL: |
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| 152 | tlb_invalidate_all(); |
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| 153 | break; |
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| 154 | case TLB_INVL_ASID: |
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| 155 | tlb_invalidate_asid(asid); |
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| 156 | break; |
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| 157 | case TLB_INVL_PAGES: |
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| 158 | ASSERT(count); |
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| 159 | tlb_invalidate_pages(asid, page, count); |
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| 160 | break; |
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| 161 | default: |
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| 162 | panic("unknown type (%d)\n", type); |
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| 163 | break; |
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| 164 | } |
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| 165 | if (type == TLB_INVL_ALL) |
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| 166 | break; |
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| 167 | } |
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| 168 | |||
| 169 | spinlock_unlock(&CPU->lock); |
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| 31 | jermar | 170 | CPU->tlb_active = 1; |
| 5 | jermar | 171 | } |
| 1002 | jermar | 172 | |
| 458 | decky | 173 | #endif /* CONFIG_SMP */ |