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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 | |||
| 1702 | cejka | 29 | /** @addtogroup genericmm |
| 30 | * @{ |
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| 31 | */ |
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| 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 |
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| 38 | * algorithm and is further simplified (e.g. all CPUs receive all TLB |
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| 39 | * shootdown messages). |
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| 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> |
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| 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 |
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| 57 | * recipients of TLB shootdown message. It must be acquired |
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| 58 | * before CPU structure lock. |
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| 59 | */ |
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| 623 | jermar | 60 | SPINLOCK_INITIALIZE(tlblock); |
| 5 | jermar | 61 | |
| 62 | void tlb_init(void) |
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| 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. |
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| 70 | * |
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| 71 | * This function attempts to deliver TLB shootdown message |
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| 72 | * to all other processors. |
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| 73 | * |
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| 74 | * This function must be called with interrupts disabled. |
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| 75 | * |
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| 76 | * @param type Type describing scope of shootdown. |
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| 77 | * @param asid Address space, if required by type. |
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| 78 | * @param page Virtual page address, if required by type. |
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| 79 | * @param count Number of pages, if required by type. |
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| 80 | */ |
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| 81 | void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count) |
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| 5 | jermar | 82 | { |
| 31 | jermar | 83 | int i; |
| 84 | |||
| 85 | CPU->tlb_active = 0; |
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| 5 | jermar | 86 | spinlock_lock(&tlblock); |
| 727 | jermar | 87 | |
| 1002 | jermar | 88 | for (i = 0; i < config.cpu_count; i++) { |
| 89 | cpu_t *cpu; |
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| 90 | |||
| 91 | if (i == CPU->id) |
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| 92 | continue; |
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| 93 | |||
| 94 | cpu = &cpus[i]; |
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| 95 | spinlock_lock(&cpu->lock); |
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| 96 | if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) { |
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| 97 | /* |
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| 98 | * The message queue is full. |
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| 99 | * Erase the queue and store one TLB_INVL_ALL message. |
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| 100 | */ |
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| 101 | cpu->tlb_messages_count = 1; |
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| 102 | cpu->tlb_messages[0].type = TLB_INVL_ALL; |
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| 103 | cpu->tlb_messages[0].asid = ASID_INVALID; |
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| 104 | cpu->tlb_messages[0].page = 0; |
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| 105 | cpu->tlb_messages[0].count = 0; |
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| 106 | } else { |
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| 107 | /* |
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| 108 | * Enqueue the message. |
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| 109 | */ |
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| 110 | cpu->tlb_messages[cpu->tlb_messages_count].type = type; |
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| 111 | cpu->tlb_messages[cpu->tlb_messages_count].asid = asid; |
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| 112 | cpu->tlb_messages[cpu->tlb_messages_count].page = page; |
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| 113 | cpu->tlb_messages[cpu->tlb_messages_count].count = count; |
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| 114 | cpu->tlb_messages_count++; |
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| 115 | } |
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| 116 | spinlock_unlock(&cpu->lock); |
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| 117 | } |
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| 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; |
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| 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); |
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| 31 | jermar | 131 | CPU->tlb_active = 1; |
| 5 | jermar | 132 | } |
| 133 | |||
| 7 | jermar | 134 | void tlb_shootdown_ipi_send(void) |
| 135 | { |
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| 136 | ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI); |
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| 137 | } |
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| 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; |
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| 144 | __address page; |
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| 145 | count_t count; |
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| 146 | int i; |
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| 147 | |||
| 1008 | jermar | 148 | ASSERT(CPU); |
| 149 | |||
| 31 | jermar | 150 | CPU->tlb_active = 0; |
| 5 | jermar | 151 | spinlock_lock(&tlblock); |
| 152 | spinlock_unlock(&tlblock); |
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| 1002 | jermar | 153 | |
| 154 | spinlock_lock(&CPU->lock); |
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| 155 | ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN); |
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| 156 | |||
| 157 | for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) { |
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| 158 | type = CPU->tlb_messages[i].type; |
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| 159 | asid = CPU->tlb_messages[i].asid; |
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| 160 | page = CPU->tlb_messages[i].page; |
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| 161 | count = CPU->tlb_messages[i].count; |
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| 162 | |||
| 163 | switch (type) { |
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| 164 | case TLB_INVL_ALL: |
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| 165 | tlb_invalidate_all(); |
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| 166 | break; |
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| 167 | case TLB_INVL_ASID: |
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| 168 | tlb_invalidate_asid(asid); |
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| 169 | break; |
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| 170 | case TLB_INVL_PAGES: |
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| 171 | ASSERT(count); |
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| 172 | tlb_invalidate_pages(asid, page, count); |
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| 173 | break; |
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| 174 | default: |
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| 175 | panic("unknown type (%d)\n", type); |
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| 176 | break; |
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| 177 | } |
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| 178 | if (type == TLB_INVL_ALL) |
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| 179 | break; |
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| 180 | } |
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| 181 | |||
| 182 | spinlock_unlock(&CPU->lock); |
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| 31 | jermar | 183 | CPU->tlb_active = 1; |
| 5 | jermar | 184 | } |
| 1002 | jermar | 185 | |
| 458 | decky | 186 | #endif /* CONFIG_SMP */ |
| 1702 | cejka | 187 | |
| 188 | /** @} |
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| 189 | */ |
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| 190 |