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  1. /*
  2.  * Copyright (c) 2006 Ondrej Palkovsky
  3.  * Copyright (c) 2006 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup genericipc
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  * @brief IRQ notification framework.
  36.  *
  37.  * This framework allows applications to register to receive a notification
  38.  * when interrupt is detected. The application may provide a simple 'top-half'
  39.  * handler as part of its registration, which can perform simple operations
  40.  * (read/write port/memory, add information to notification ipc message).
  41.  *
  42.  * The structure of a notification message is as follows:
  43.  * - METHOD: method as registered by the SYS_IPC_REGISTER_IRQ syscall
  44.  * - ARG1: payload modified by a 'top-half' handler
  45.  * - ARG2: payload modified by a 'top-half' handler
  46.  * - ARG3: payload modified by a 'top-half' handler
  47.  * - ARG4: payload modified by a 'top-half' handler
  48.  * - ARG5: payload modified by a 'top-half' handler
  49.  * - in_phone_hash: interrupt counter (may be needed to assure correct order
  50.  *         in multithreaded drivers)
  51.  *
  52.  * Note on synchronization for ipc_irq_register(), ipc_irq_unregister(),
  53.  * ipc_irq_cleanup() and IRQ handlers:
  54.  *
  55.  *   By always taking all of the uspace IRQ hash table lock, IRQ structure lock
  56.  *   and answerbox lock, we can rule out race conditions between the
  57.  *   registration functions and also the cleanup function. Thus the observer can
  58.  *   either see the IRQ structure present in both the hash table and the
  59.  *   answerbox list or absent in both. Views in which the IRQ structure would be
  60.  *   linked in the hash table but not in the answerbox list, or vice versa, are
  61.  *   not possible.
  62.  *
  63.  *   By always taking the hash table lock and the IRQ structure lock, we can
  64.  *   rule out a scenario in which we would free up an IRQ structure, which is
  65.  *   still referenced by, for example, an IRQ handler. The locking scheme forces
  66.  *   us to lock the IRQ structure only after any progressing IRQs on that
  67.  *   structure are finished. Because we hold the hash table lock, we prevent new
  68.  *   IRQs from taking new references to the IRQ structure.
  69.  */
  70.  
  71. #include <arch.h>
  72. #include <mm/slab.h>
  73. #include <errno.h>
  74. #include <ddi/irq.h>
  75. #include <ipc/ipc.h>
  76. #include <ipc/irq.h>
  77. #include <syscall/copy.h>
  78. #include <console/console.h>
  79. #include <print.h>
  80.  
  81. /** Free the top-half pseudocode.
  82.  *
  83.  * @param code      Pointer to the top-half pseudocode.
  84.  */
  85. static void code_free(irq_code_t *code)
  86. {
  87.     if (code) {
  88.         free(code->cmds);
  89.         free(code);
  90.     }
  91. }
  92.  
  93. /** Copy the top-half pseudocode from userspace into the kernel.
  94.  *
  95.  * @param ucode     Userspace address of the top-half pseudocode.
  96.  *
  97.  * @return      Kernel address of the copied pseudocode.
  98.  */
  99. static irq_code_t *code_from_uspace(irq_code_t *ucode)
  100. {
  101.     irq_code_t *code;
  102.     irq_cmd_t *ucmds;
  103.     int rc;
  104.  
  105.     code = malloc(sizeof(*code), 0);
  106.     rc = copy_from_uspace(code, ucode, sizeof(*code));
  107.     if (rc != 0) {
  108.         free(code);
  109.         return NULL;
  110.     }
  111.    
  112.     if (code->cmdcount > IRQ_MAX_PROG_SIZE) {
  113.         free(code);
  114.         return NULL;
  115.     }
  116.     ucmds = code->cmds;
  117.     code->cmds = malloc(sizeof(code->cmds[0]) * code->cmdcount, 0);
  118.     rc = copy_from_uspace(code->cmds, ucmds,
  119.         sizeof(code->cmds[0]) * code->cmdcount);
  120.     if (rc != 0) {
  121.         free(code->cmds);
  122.         free(code);
  123.         return NULL;
  124.     }
  125.  
  126.     return code;
  127. }
  128.  
  129. /** Register an answerbox as a receiving end for IRQ notifications.
  130.  *
  131.  * @param box       Receiving answerbox.
  132.  * @param inr       IRQ number.
  133.  * @param devno     Device number.
  134.  * @param method    Method to be associated with the notification.
  135.  * @param ucode     Uspace pointer to top-half pseudocode.
  136.  *
  137.  * @return      EBADMEM, ENOENT or EEXISTS on failure or 0 on success.
  138.  */
  139. int ipc_irq_register(answerbox_t *box, inr_t inr, devno_t devno,
  140.     unative_t method, irq_code_t *ucode)
  141. {
  142.     ipl_t ipl;
  143.     irq_code_t *code;
  144.     irq_t *irq;
  145.     unative_t key[] = {
  146.         (unative_t) inr,
  147.         (unative_t) devno
  148.     };
  149.  
  150.     if (ucode) {
  151.         code = code_from_uspace(ucode);
  152.         if (!code)
  153.             return EBADMEM;
  154.     } else {
  155.         code = NULL;
  156.     }
  157.  
  158.     /*
  159.      * Allocate and populate the IRQ structure.
  160.      */
  161.     irq = malloc(sizeof(irq_t), 0);
  162.     irq_initialize(irq);
  163.     irq->devno = devno;
  164.     irq->inr = inr;
  165.     irq->claim = ipc_irq_top_half_claim;
  166.     irq->handler = ipc_irq_top_half_handler;   
  167.     irq->notif_cfg.notify = true;
  168.     irq->notif_cfg.answerbox = box;
  169.     irq->notif_cfg.method = method;
  170.     irq->notif_cfg.code = code;
  171.     irq->notif_cfg.counter = 0;
  172.  
  173.     /*
  174.      * Enlist the IRQ structure in the uspace IRQ hash table and the
  175.      * answerbox's list.
  176.      */
  177.     ipl = interrupts_disable();
  178.     spinlock_lock(&irq_uspace_hash_table_lock);
  179.     spinlock_lock(&irq->lock);
  180.     spinlock_lock(&box->irq_lock);
  181.     if (hash_table_find(&irq_uspace_hash_table, key)) {
  182.         code_free(code);
  183.         spinlock_unlock(&box->irq_lock);
  184.         spinlock_unlock(&irq->lock);
  185.         spinlock_unlock(&irq_uspace_hash_table_lock);
  186.         free(irq);
  187.         interrupts_restore(ipl);
  188.         return EEXISTS;
  189.     }
  190.     hash_table_insert(&irq_uspace_hash_table, key, &irq->link);
  191.     list_append(&irq->notif_cfg.link, &box->irq_head);
  192.     spinlock_unlock(&box->irq_lock);
  193.     spinlock_unlock(&irq->lock);
  194.     spinlock_unlock(&irq_uspace_hash_table_lock);
  195.  
  196.     interrupts_restore(ipl);
  197.     return EOK;
  198. }
  199.  
  200. /** Unregister task from IRQ notification.
  201.  *
  202.  * @param box       Answerbox associated with the notification.
  203.  * @param inr       IRQ number.
  204.  * @param devno     Device number.
  205.  */
  206. int ipc_irq_unregister(answerbox_t *box, inr_t inr, devno_t devno)
  207. {
  208.     ipl_t ipl;
  209.     unative_t key[] = {
  210.         (unative_t) inr,
  211.         (unative_t) devno
  212.     };
  213.     link_t *lnk;
  214.     irq_t *irq;
  215.  
  216.     ipl = interrupts_disable();
  217.     spinlock_lock(&irq_uspace_hash_table_lock);
  218.     lnk = hash_table_find(&irq_uspace_hash_table, key);
  219.     if (!lnk) {
  220.         spinlock_unlock(&irq_uspace_hash_table_lock);
  221.         interrupts_restore(ipl);
  222.         return ENOENT;
  223.     }
  224.     irq = hash_table_get_instance(lnk, irq_t, link);
  225.     spinlock_lock(&irq->lock);
  226.     spinlock_lock(&box->irq_lock);
  227.    
  228.     ASSERT(irq->notif_cfg.answerbox == box);
  229.    
  230.     /* Free up the pseudo code and associated structures. */
  231.     code_free(irq->notif_cfg.code);
  232.  
  233.     /* Remove the IRQ from the answerbox's list. */
  234.     list_remove(&irq->notif_cfg.link);
  235.  
  236.     /* Remove the IRQ from the uspace IRQ hash table. */
  237.     hash_table_remove(&irq_uspace_hash_table, key, 2);
  238.    
  239.     spinlock_unlock(&irq_uspace_hash_table_lock);
  240.     spinlock_unlock(&irq->lock);
  241.     spinlock_unlock(&box->irq_lock);
  242.    
  243.     /* Free up the IRQ structure. */
  244.     free(irq);
  245.    
  246.     interrupts_restore(ipl);
  247.     return EOK;
  248. }
  249.  
  250.  
  251. /** Disconnect all IRQ notifications from an answerbox.
  252.  *
  253.  * This function is effective because the answerbox contains
  254.  * list of all irq_t structures that are registered to
  255.  * send notifications to it.
  256.  *
  257.  * @param box       Answerbox for which we want to carry out the cleanup.
  258.  */
  259. void ipc_irq_cleanup(answerbox_t *box)
  260. {
  261.     ipl_t ipl;
  262.    
  263. loop:
  264.     ipl = interrupts_disable();
  265.     spinlock_lock(&irq_uspace_hash_table_lock);
  266.     spinlock_lock(&box->irq_lock);
  267.    
  268.     while (box->irq_head.next != &box->irq_head) {
  269.         link_t *cur = box->irq_head.next;
  270.         irq_t *irq;
  271.         DEADLOCK_PROBE_INIT(p_irqlock);
  272.         unative_t key[2];
  273.        
  274.         irq = list_get_instance(cur, irq_t, notif_cfg.link);
  275.         if (!spinlock_trylock(&irq->lock)) {
  276.             /*
  277.              * Avoid deadlock by trying again.
  278.              */
  279.             spinlock_unlock(&box->irq_lock);
  280.             spinlock_unlock(&irq_uspace_hash_table_lock);
  281.             interrupts_restore(ipl);
  282.             DEADLOCK_PROBE(p_irqlock, DEADLOCK_THRESHOLD);
  283.             goto loop;
  284.         }
  285.         key[0] = irq->inr;
  286.         key[1] = irq->devno;
  287.        
  288.        
  289.         ASSERT(irq->notif_cfg.answerbox == box);
  290.        
  291.         /* Unlist from the answerbox. */
  292.         list_remove(&irq->notif_cfg.link);
  293.        
  294.         /* Remove from the hash table. */
  295.         hash_table_remove(&irq_uspace_hash_table, key, 2);
  296.        
  297.         /* Free up the pseudo code and associated structures. */
  298.         code_free(irq->notif_cfg.code);
  299.        
  300.         spinlock_unlock(&irq->lock);
  301.         free(irq);
  302.     }
  303.    
  304.     spinlock_unlock(&box->irq_lock);
  305.     spinlock_unlock(&irq_uspace_hash_table_lock);
  306.     interrupts_restore(ipl);
  307. }
  308.  
  309. /** Add a call to the proper answerbox queue.
  310.  *
  311.  * Assume irq->lock is locked.
  312.  *
  313.  * @param irq       IRQ structure referencing the target answerbox.
  314.  * @param call      IRQ notification call.
  315.  */
  316. static void send_call(irq_t *irq, call_t *call)
  317. {
  318.     spinlock_lock(&irq->notif_cfg.answerbox->irq_lock);
  319.     list_append(&call->link, &irq->notif_cfg.answerbox->irq_notifs);
  320.     spinlock_unlock(&irq->notif_cfg.answerbox->irq_lock);
  321.        
  322.     waitq_wakeup(&irq->notif_cfg.answerbox->wq, WAKEUP_FIRST);
  323. }
  324.  
  325. /** Apply the top-half pseudo code to find out whether to accept the IRQ or not.
  326.  *
  327.  * @param irq       IRQ structure.
  328.  *
  329.  * @return      IRQ_ACCEPT if the interrupt is accepted by the
  330.  *          pseudocode. IRQ_DECLINE otherwise.
  331.  */
  332. irq_ownership_t ipc_irq_top_half_claim(irq_t *irq)
  333. {
  334.     unsigned int i;
  335.     unative_t dstval;
  336.     irq_code_t *code = irq->notif_cfg.code;
  337.     unative_t *scratch = irq->notif_cfg.scratch;
  338.  
  339.    
  340.     if (!irq->notif_cfg.notify)
  341.         return IRQ_DECLINE;
  342.    
  343.     if (!code)
  344.         return IRQ_DECLINE;
  345.    
  346.     for (i = 0; i < code->cmdcount; i++) {
  347.         unsigned int srcarg = code->cmds[i].srcarg;
  348.         unsigned int dstarg = code->cmds[i].dstarg;
  349.        
  350.         if (srcarg >= IPC_CALL_LEN)
  351.             break;
  352.         if (dstarg >= IPC_CALL_LEN)
  353.             break;
  354.    
  355.         switch (code->cmds[i].cmd) {
  356.         case CMD_PIO_READ_8:
  357.             dstval = pio_read_8((ioport8_t *) code->cmds[i].addr);
  358.             if (dstarg)
  359.                 scratch[dstarg] = dstval;
  360.             break;
  361.         case CMD_PIO_READ_16:
  362.             dstval = pio_read_16((ioport16_t *) code->cmds[i].addr);
  363.             if (dstarg)
  364.                 scratch[dstarg] = dstval;
  365.             break;
  366.         case CMD_PIO_READ_32:
  367.             dstval = pio_read_32((ioport32_t *) code->cmds[i].addr);
  368.             if (dstarg)
  369.                 scratch[dstarg] = dstval;
  370.             break;
  371.         case CMD_PIO_WRITE_8:
  372.             pio_write_8((ioport8_t *) code->cmds[i].addr,
  373.                 (uint8_t) code->cmds[i].value);
  374.             break;
  375.         case CMD_PIO_WRITE_16:
  376.             pio_write_16((ioport16_t *) code->cmds[i].addr,
  377.                 (uint16_t) code->cmds[i].value);
  378.             break;
  379.         case CMD_PIO_WRITE_32:
  380.             pio_write_32((ioport32_t *) code->cmds[i].addr,
  381.                 (uint32_t) code->cmds[i].value);
  382.             break;
  383.         case CMD_BTEST:
  384.             if (srcarg && dstarg) {
  385.                 dstval = scratch[srcarg] & code->cmds[i].value;
  386.                 scratch[dstarg] = dstval;
  387.             }
  388.             break;
  389.         case CMD_PREDICATE:
  390.             if (srcarg && !scratch[srcarg]) {
  391.                 i += code->cmds[i].value;
  392.                 continue;
  393.             }
  394.             break;
  395.         case CMD_ACCEPT:
  396.             return IRQ_ACCEPT;
  397.             break;
  398.         case CMD_DECLINE:
  399.         default:
  400.             return IRQ_DECLINE;
  401.         }
  402.     }
  403.    
  404.     return IRQ_DECLINE;
  405. }
  406.  
  407.  
  408. /* IRQ top-half handler.
  409.  *
  410.  * We expect interrupts to be disabled and the irq->lock already held.
  411.  *
  412.  * @param irq       IRQ structure.
  413.  */
  414. void ipc_irq_top_half_handler(irq_t *irq)
  415. {
  416.     ASSERT(irq);
  417.  
  418.     if (irq->notif_cfg.answerbox) {
  419.         call_t *call;
  420.  
  421.         call = ipc_call_alloc(FRAME_ATOMIC);
  422.         if (!call)
  423.             return;
  424.        
  425.         call->flags |= IPC_CALL_NOTIF;
  426.         /* Put a counter to the message */
  427.         call->priv = ++irq->notif_cfg.counter;
  428.  
  429.         /* Set up args */
  430.         IPC_SET_METHOD(call->data, irq->notif_cfg.method);
  431.         IPC_SET_ARG1(call->data, irq->notif_cfg.scratch[1]);
  432.         IPC_SET_ARG2(call->data, irq->notif_cfg.scratch[2]);
  433.         IPC_SET_ARG3(call->data, irq->notif_cfg.scratch[3]);
  434.         IPC_SET_ARG4(call->data, irq->notif_cfg.scratch[4]);
  435.         IPC_SET_ARG5(call->data, irq->notif_cfg.scratch[5]);
  436.  
  437.         send_call(irq, call);
  438.     }
  439. }
  440.  
  441. /** Send notification message.
  442.  *
  443.  * @param irq       IRQ structure.
  444.  * @param a1        Driver-specific payload argument.
  445.  * @param a2        Driver-specific payload argument.
  446.  * @param a3        Driver-specific payload argument.
  447.  * @param a4        Driver-specific payload argument.
  448.  * @param a5        Driver-specific payload argument.
  449.  */
  450. void ipc_irq_send_msg(irq_t *irq, unative_t a1, unative_t a2, unative_t a3,
  451.     unative_t a4, unative_t a5)
  452. {
  453.     call_t *call;
  454.  
  455.     spinlock_lock(&irq->lock);
  456.  
  457.     if (irq->notif_cfg.answerbox) {
  458.         call = ipc_call_alloc(FRAME_ATOMIC);
  459.         if (!call) {
  460.             spinlock_unlock(&irq->lock);
  461.             return;
  462.         }
  463.         call->flags |= IPC_CALL_NOTIF;
  464.         /* Put a counter to the message */
  465.         call->priv = ++irq->notif_cfg.counter;
  466.  
  467.         IPC_SET_METHOD(call->data, irq->notif_cfg.method);
  468.         IPC_SET_ARG1(call->data, a1);
  469.         IPC_SET_ARG2(call->data, a2);
  470.         IPC_SET_ARG3(call->data, a3);
  471.         IPC_SET_ARG4(call->data, a4);
  472.         IPC_SET_ARG5(call->data, a5);
  473.        
  474.         send_call(irq, call);
  475.     }
  476.     spinlock_unlock(&irq->lock);
  477. }
  478.  
  479. /** @}
  480.  */
  481.