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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 <proc/scheduler.h>
  30. #include <proc/thread.h>
  31. #include <proc/task.h>
  32. #include <mm/frame.h>
  33. #include <mm/page.h>
  34. #include <arch/asm.h>
  35. #include <arch.h>
  36. #include <synch/synch.h>
  37. #include <synch/spinlock.h>
  38. #include <synch/waitq.h>
  39. #include <synch/rwlock.h>
  40. #include <cpu.h>
  41. #include <func.h>
  42. #include <context.h>
  43. #include <adt/list.h>
  44. #include <typedefs.h>
  45. #include <time/clock.h>
  46. #include <adt/list.h>
  47. #include <config.h>
  48. #include <arch/interrupt.h>
  49. #include <smp/ipi.h>
  50. #include <arch/faddr.h>
  51. #include <arch/atomic.h>
  52. #include <memstr.h>
  53. #include <print.h>
  54. #include <mm/slab.h>
  55. #include <debug.h>
  56.  
  57. char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
  58.  
  59. SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
  60. LIST_INITIALIZE(threads_head);      /**< List of all threads. */
  61.  
  62. SPINLOCK_INITIALIZE(tidlock);
  63. __u32 last_tid = 0;
  64.  
  65. static slab_cache_t *thread_slab;
  66. #ifdef ARCH_HAS_FPU
  67. slab_cache_t *fpu_context_slab;
  68. #endif
  69.  
  70.  
  71. /** Thread wrapper
  72.  *
  73.  * This wrapper is provided to ensure that every thread
  74.  * makes a call to thread_exit() when its implementing
  75.  * function returns.
  76.  *
  77.  * interrupts_disable() is assumed.
  78.  *
  79.  */
  80. static void cushion(void)
  81. {
  82.     void (*f)(void *) = THREAD->thread_code;
  83.     void *arg = THREAD->thread_arg;
  84.  
  85.     /* this is where each thread wakes up after its creation */
  86.     before_thread_runs();
  87.  
  88.     spinlock_unlock(&THREAD->lock);
  89.     interrupts_enable();
  90.  
  91.     f(arg);
  92.     thread_exit();
  93.     /* not reached */
  94. }
  95.  
  96. /** Initialization and allocation for thread_t structure */
  97. static int thr_constructor(void *obj, int kmflags)
  98. {
  99.     thread_t *t = (thread_t *)obj;
  100.     pfn_t pfn;
  101.     int status;
  102.  
  103.     spinlock_initialize(&t->lock, "thread_t_lock");
  104.     link_initialize(&t->rq_link);
  105.     link_initialize(&t->wq_link);
  106.     link_initialize(&t->th_link);
  107.     link_initialize(&t->threads_link);
  108.    
  109. #ifdef ARCH_HAS_FPU
  110. #  ifdef CONFIG_FPU_LAZY
  111.     t->saved_fpu_context = NULL;
  112. #  else
  113.     t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
  114.     if (!t->saved_fpu_context)
  115.         return -1;
  116. #  endif
  117. #endif 
  118.  
  119.     pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
  120.     if (status) {
  121. #ifdef ARCH_HAS_FPU
  122.         if (t->saved_fpu_context)
  123.             slab_free(fpu_context_slab,t->saved_fpu_context);
  124. #endif
  125.         return -1;
  126.     }
  127.     t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
  128.  
  129.     return 0;
  130. }
  131.  
  132. /** Destruction of thread_t object */
  133. static int thr_destructor(void *obj)
  134. {
  135.     thread_t *t = (thread_t *)obj;
  136.  
  137.     frame_free(ADDR2PFN(KA2PA(t->kstack)));
  138. #ifdef ARCH_HAS_FPU
  139.     if (t->saved_fpu_context)
  140.         slab_free(fpu_context_slab,t->saved_fpu_context);
  141. #endif
  142.     return 1; /* One page freed */
  143. }
  144.  
  145. /** Initialize threads
  146.  *
  147.  * Initialize kernel threads support.
  148.  *
  149.  */
  150. void thread_init(void)
  151. {
  152.     THREAD = NULL;
  153.     atomic_set(&nrdy,0);
  154.     thread_slab = slab_cache_create("thread_slab",
  155.                     sizeof(thread_t),0,
  156.                     thr_constructor, thr_destructor, 0);
  157. #ifdef ARCH_HAS_FPU
  158.     fpu_context_slab = slab_cache_create("fpu_slab",
  159.                          sizeof(fpu_context_t),
  160.                          FPU_CONTEXT_ALIGN,
  161.                          NULL, NULL, 0);
  162. #endif
  163. }
  164.  
  165.  
  166. /** Make thread ready
  167.  *
  168.  * Switch thread t to the ready state.
  169.  *
  170.  * @param t Thread to make ready.
  171.  *
  172.  */
  173. void thread_ready(thread_t *t)
  174. {
  175.     cpu_t *cpu;
  176.     runq_t *r;
  177.     ipl_t ipl;
  178.     int i, avg;
  179.  
  180.     ipl = interrupts_disable();
  181.  
  182.     spinlock_lock(&t->lock);
  183.  
  184.     i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
  185.    
  186.     cpu = CPU;
  187.     if (t->flags & X_WIRED) {
  188.         cpu = t->cpu;
  189.     }
  190.     spinlock_unlock(&t->lock);
  191.    
  192.     /*
  193.      * Append t to respective ready queue on respective processor.
  194.      */
  195.     r = &cpu->rq[i];
  196.     spinlock_lock(&r->lock);
  197.     list_append(&t->rq_link, &r->rq_head);
  198.     r->n++;
  199.     spinlock_unlock(&r->lock);
  200.  
  201.     atomic_inc(&nrdy);
  202.     avg = atomic_get(&nrdy) / config.cpu_active;
  203.     atomic_inc(&cpu->nrdy);
  204.  
  205.     interrupts_restore(ipl);
  206. }
  207.  
  208.  
  209. /** Destroy thread memory structure
  210.  *
  211.  * Detach thread from all queues, cpus etc. and destroy it.
  212.  *
  213.  * Assume thread->lock is held!!
  214.  */
  215. void thread_destroy(thread_t *t)
  216. {
  217.     ASSERT(t->state == Exiting);
  218.     ASSERT(t->task);
  219.     ASSERT(t->cpu);
  220.  
  221.     spinlock_lock(&t->cpu->lock);
  222.     if(t->cpu->fpu_owner==t)
  223.         t->cpu->fpu_owner=NULL;
  224.     spinlock_unlock(&t->cpu->lock);
  225.  
  226.     /*
  227.      * Detach from the containing task.
  228.      */
  229.     spinlock_lock(&t->task->lock);
  230.     list_remove(&t->th_link);
  231.     spinlock_unlock(&t->task->lock);
  232.    
  233.     spinlock_unlock(&t->lock);
  234.    
  235.     spinlock_lock(&threads_lock);
  236.     list_remove(&t->threads_link);
  237.     spinlock_unlock(&threads_lock);
  238.    
  239.     slab_free(thread_slab, t);
  240. }
  241.  
  242.  
  243. /** Create new thread
  244.  *
  245.  * Create a new thread.
  246.  *
  247.  * @param func  Thread's implementing function.
  248.  * @param arg   Thread's implementing function argument.
  249.  * @param task  Task to which the thread belongs.
  250.  * @param flags Thread flags.
  251.  *
  252.  * @return New thread's structure on success, NULL on failure.
  253.  *
  254.  */
  255. thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
  256. {
  257.     thread_t *t;
  258.     ipl_t ipl;
  259.    
  260.     t = (thread_t *) slab_alloc(thread_slab, 0);
  261.     if (!t)
  262.         return NULL;
  263.    
  264.     /* Not needed, but good for debugging */
  265.     memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
  266.    
  267.     ipl = interrupts_disable();
  268.     spinlock_lock(&tidlock);
  269.     t->tid = ++last_tid;
  270.     spinlock_unlock(&tidlock);
  271.     interrupts_restore(ipl);
  272.    
  273.     context_save(&t->saved_context);
  274.     context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
  275.    
  276.     the_initialize((the_t *) t->kstack);
  277.    
  278.     ipl = interrupts_disable();
  279.     t->saved_context.ipl = interrupts_read();
  280.     interrupts_restore(ipl);
  281.    
  282.     t->thread_code = func;
  283.     t->thread_arg = arg;
  284.     t->ticks = -1;
  285.     t->priority = -1;       /* start in rq[0] */
  286.     t->cpu = NULL;
  287.     t->flags = 0;
  288.     t->state = Entering;
  289.     t->call_me = NULL;
  290.     t->call_me_with = NULL;
  291.    
  292.     timeout_initialize(&t->sleep_timeout);
  293.     t->sleep_queue = NULL;
  294.     t->timeout_pending = 0;
  295.    
  296.     t->rwlock_holder_type = RWLOCK_NONE;
  297.        
  298.     t->task = task;
  299.    
  300.     t->fpu_context_exists = 0;
  301.     t->fpu_context_engaged = 0;
  302.    
  303.     /*
  304.      * Register this thread in the system-wide list.
  305.      */
  306.     ipl = interrupts_disable();
  307.     spinlock_lock(&threads_lock);
  308.     list_append(&t->threads_link, &threads_head);
  309.     spinlock_unlock(&threads_lock);
  310.    
  311.     /*
  312.      * Attach to the containing task.
  313.      */
  314.     spinlock_lock(&task->lock);
  315.     list_append(&t->th_link, &task->th_head);
  316.     spinlock_unlock(&task->lock);
  317.    
  318.     interrupts_restore(ipl);
  319.    
  320.     return t;
  321. }
  322.  
  323.  
  324. /** Make thread exiting
  325.  *
  326.  * End current thread execution and switch it to the exiting
  327.  * state. All pending timeouts are executed.
  328.  *
  329.  */
  330. void thread_exit(void)
  331. {
  332.     ipl_t ipl;
  333.  
  334. restart:
  335.     ipl = interrupts_disable();
  336.     spinlock_lock(&THREAD->lock);
  337.     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
  338.         spinlock_unlock(&THREAD->lock);
  339.         interrupts_restore(ipl);
  340.         goto restart;
  341.     }
  342.     THREAD->state = Exiting;
  343.     spinlock_unlock(&THREAD->lock);
  344.     scheduler();
  345. }
  346.  
  347.  
  348. /** Thread sleep
  349.  *
  350.  * Suspend execution of the current thread.
  351.  *
  352.  * @param sec Number of seconds to sleep.
  353.  *
  354.  */
  355. void thread_sleep(__u32 sec)
  356. {
  357.     thread_usleep(sec*1000000);
  358. }
  359.  
  360.  
  361. /** Thread usleep
  362.  *
  363.  * Suspend execution of the current thread.
  364.  *
  365.  * @param usec Number of microseconds to sleep.
  366.  *
  367.  */
  368. void thread_usleep(__u32 usec)
  369. {
  370.     waitq_t wq;
  371.                  
  372.     waitq_initialize(&wq);
  373.  
  374.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  375. }
  376.  
  377.  
  378. /** Register thread out-of-context invocation
  379.  *
  380.  * Register a function and its argument to be executed
  381.  * on next context switch to the current thread.
  382.  *
  383.  * @param call_me      Out-of-context function.
  384.  * @param call_me_with Out-of-context function argument.
  385.  *
  386.  */
  387. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  388. {
  389.     ipl_t ipl;
  390.    
  391.     ipl = interrupts_disable();
  392.     spinlock_lock(&THREAD->lock);
  393.     THREAD->call_me = call_me;
  394.     THREAD->call_me_with = call_me_with;
  395.     spinlock_unlock(&THREAD->lock);
  396.     interrupts_restore(ipl);
  397. }
  398.  
  399. /** Print list of threads debug info */
  400. void thread_print_list(void)
  401. {
  402.     link_t *cur;
  403.     thread_t *t;
  404.     ipl_t ipl;
  405.    
  406.     /* Messing with thread structures, avoid deadlock */
  407.     ipl = interrupts_disable();
  408.     spinlock_lock(&threads_lock);
  409.  
  410.     for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
  411.         t = list_get_instance(cur, thread_t, threads_link);
  412.         printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
  413.         if (t->cpu)
  414.             printf("cpu%d ", t->cpu->id);
  415.         printf("\n");
  416.     }
  417.  
  418.     spinlock_unlock(&threads_lock);
  419.     interrupts_restore(ipl);
  420. }
  421.