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  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.  
  29. #include <mm/tlb.h>
  30. #include <mm/asid.h>
  31. #include <arch/mm/tlb.h>
  32. #include <smp/ipi.h>
  33. #include <synch/spinlock.h>
  34. #include <typedefs.h>
  35. #include <atomic.h>
  36. #include <arch/interrupt.h>
  37. #include <config.h>
  38. #include <arch.h>
  39. #include <panic.h>
  40. #include <debug.h>
  41.  
  42. /**
  43.  * This lock is used for synchronisation between sender and
  44.  * recipients of TLB shootdown message. It must be acquired
  45.  * before CPU structure lock.
  46.  */
  47. SPINLOCK_INITIALIZE(tlblock);
  48.  
  49. void tlb_init(void)
  50. {
  51.     tlb_arch_init();
  52. }
  53.  
  54. #ifdef CONFIG_SMP
  55.  
  56. /** Send TLB shootdown message.
  57.  *
  58.  * This function attempts to deliver TLB shootdown message
  59.  * to all other processors.
  60.  *
  61.  * This function must be called with interrupts disabled.
  62.  *
  63.  * @param type Type describing scope of shootdown.
  64.  * @param asid Address space, if required by type.
  65.  * @param page Virtual page address, if required by type.
  66.  * @param count Number of pages, if required by type.
  67.  */
  68. void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t count)
  69. {
  70.     int i;
  71.  
  72.     CPU->tlb_active = 0;
  73.     spinlock_lock(&tlblock);
  74.    
  75.     for (i = 0; i < config.cpu_count; i++) {
  76.         cpu_t *cpu;
  77.        
  78.         if (i == CPU->id)
  79.             continue;
  80.  
  81.         cpu = &cpus[i];
  82.         spinlock_lock(&cpu->lock);
  83.         if (cpu->tlb_messages_count == TLB_MESSAGE_QUEUE_LEN) {
  84.             /*
  85.              * The message queue is full.
  86.              * Erase the queue and store one TLB_INVL_ALL message.
  87.              */
  88.             cpu->tlb_messages_count = 1;
  89.             cpu->tlb_messages[0].type = TLB_INVL_ALL;
  90.             cpu->tlb_messages[0].asid = ASID_INVALID;
  91.             cpu->tlb_messages[0].page = 0;
  92.             cpu->tlb_messages[0].count = 0;
  93.         } else {
  94.             /*
  95.              * Enqueue the message.
  96.              */
  97.             cpu->tlb_messages[cpu->tlb_messages_count].type = type;
  98.             cpu->tlb_messages[cpu->tlb_messages_count].asid = asid;
  99.             cpu->tlb_messages[cpu->tlb_messages_count].page = page;
  100.             cpu->tlb_messages[cpu->tlb_messages_count].count = count;
  101.             cpu->tlb_messages_count++;
  102.         }
  103.         spinlock_unlock(&cpu->lock);
  104.     }
  105.    
  106.     tlb_shootdown_ipi_send();
  107.  
  108. busy_wait: 
  109.     for (i = 0; i < config.cpu_count; i++)
  110.         if (cpus[i].tlb_active)
  111.             goto busy_wait;
  112. }
  113.  
  114. /** Finish TLB shootdown sequence. */
  115. void tlb_shootdown_finalize(void)
  116. {
  117.     spinlock_unlock(&tlblock);
  118.     CPU->tlb_active = 1;
  119. }
  120.  
  121. void tlb_shootdown_ipi_send(void)
  122. {
  123.     ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
  124. }
  125.  
  126. /** Receive TLB shootdown message. */
  127. void tlb_shootdown_ipi_recv(void)
  128. {
  129.     tlb_invalidate_type_t type;
  130.     asid_t asid;
  131.     __address page;
  132.     count_t count;
  133.     int i;
  134.    
  135.     ASSERT(CPU);
  136.    
  137.     CPU->tlb_active = 0;
  138.     spinlock_lock(&tlblock);
  139.     spinlock_unlock(&tlblock);
  140.    
  141.     spinlock_lock(&CPU->lock);
  142.     ASSERT(CPU->tlb_messages_count <= TLB_MESSAGE_QUEUE_LEN);
  143.  
  144.     for (i = 0; i < CPU->tlb_messages_count; CPU->tlb_messages_count--) {
  145.         type = CPU->tlb_messages[i].type;
  146.         asid = CPU->tlb_messages[i].asid;
  147.         page = CPU->tlb_messages[i].page;
  148.         count = CPU->tlb_messages[i].count;
  149.  
  150.         switch (type) {
  151.             case TLB_INVL_ALL:
  152.             tlb_invalidate_all();
  153.             break;
  154.             case TLB_INVL_ASID:
  155.             tlb_invalidate_asid(asid);
  156.             break;
  157.             case TLB_INVL_PAGES:
  158.                 ASSERT(count);
  159.             tlb_invalidate_pages(asid, page, count);
  160.             break;
  161.             default:
  162.             panic("unknown type (%d)\n", type);
  163.             break;
  164.         }
  165.         if (type == TLB_INVL_ALL)
  166.             break;
  167.     }
  168.    
  169.     spinlock_unlock(&CPU->lock);
  170.     CPU->tlb_active = 1;
  171. }
  172.  
  173. #endif /* CONFIG_SMP */
  174.