WebSVN – HelenOS – Diff – //branches/rcu/kernel/generic/src/ipc/irq.c

 #include <ipc/ipc.h>
 #include <ipc/irq.h>
 #include <syscall/copy.h>
 #include <console/console.h>
 #include <print.h>
+#include <synch/rcu.h>
+#include <adt/listrcu.h>
 /** Execute code associated with IRQ notification.
+ *
  * @param call Notification call.
  * @param code Top-half pseudocode.
  */
 void ipc_irq_unregister(answerbox_t *box, inr_t inr, devno_t devno)
+{
     ipl_t ipl;
     irq_t *irq;
+    ipc_notif_cfg_t *new_notify, *old_notify;
     ipl = interrupts_disable();
     irq = irq_find_and_lock(inr, devno);
     if (irq) {
-        if (irq->notif_cfg.answerbox == box) {
+        if (rcu_dereference_pointer(irq->notif_cfg).answerbox == box) {
-            code_free(irq->notif_cfg.code);
+            new_notify = malloc(sizeof(ipc_notif_cfg_t),0);
-            irq->notif_cfg.notify = false;
+            new_notify->notify = false;
-            irq->notif_cfg.answerbox = NULL;
+            new_notify->answerbox = NULL;
-            irq->notif_cfg.code = NULL;
+            new_notify->code = NULL;
-            irq->notif_cfg.method = 0;
+            new_notify->method = 0;
-            irq->notif_cfg.counter = 0;
+            new_notify->counter = 0;
+            old_notify = irq->notif_cfg;
+            copy_link_rcu(&irq->notif_cfg->link, &new_notify->link);
+            rcu_assign_pointer(old_notify, new_notify);
             spinlock_lock(&box->irq_lock);
-            list_remove(&irq->notif_cfg.link);
+            list_remove_rcu(&rcu_dereference_pointer(irq->notif_cfg).link);
             spinlock_unlock(&box->irq_lock);
+            rcu_sync_callback_normal_alloc(&ipc_notif_free_callback, irq->notif_cfg);
             spinlock_unlock(&irq->lock);
+        }
+    }
     interrupts_restore(ipl);
+}
+void ipc_notif_free_callback(void* notif)
+{
+    code_free(((ipc_notif_cfg_t *)notif)->code);
+    free(notif);
+}
 /** Register an answerbox as a receiving end for IRQ notifications.
+ *
  * @param box Receiving answerbox.
  * @param inr IRQ number.
  * @param devno Device number.
 int ipc_irq_register(answerbox_t *box, inr_t inr, devno_t devno, unative_t method, irq_code_t *ucode)
+{
     ipl_t ipl;
     irq_code_t *code;
     irq_t *irq;
+    ipc_notif_cfg_t *new_notify, *old_notify;
     if (ucode) {
         code = code_from_uspace(ucode);
         if (!code)
             return EBADMEM;
         interrupts_restore(ipl);
         code_free(code);
         return ENOENT;
+    }
-    if (irq->notif_cfg.answerbox) {
+    if (rcu_dereference_pointer(irq->notif_cfg).answerbox) {
         spinlock_unlock(&irq->lock);
         interrupts_restore(ipl);
         code_free(code);
         return EEXISTS;
+    }
+    new_notify = malloc(sizeof(ipc_notif_cfg_t),0);
-    irq->notif_cfg.notify = true;
+    new_notify->notify = true;
-    irq->notif_cfg.answerbox = box;
+    new_notify->answerbox = box;
-    irq->notif_cfg.method = method;
+    new_notify->method = method;
-    irq->notif_cfg.code = code;
+    new_notify->code = code;
-    irq->notif_cfg.counter = 0;
+    new_notify->counter = 0;
+    copy_link_rcu(&irq->notif_cfg->link, &new_notify->link);
+    old_notify = irq->notif_cfg;
+    rcu_assign_pointer(irq->notif_cfg, new_notify);
+    rcu_sync_callback_normal_alloc(&ipc_notif_free_callback, old_notify);
     spinlock_lock(&box->irq_lock);
-    list_append(&irq->notif_cfg.link, &box->irq_head);
+    list_append_rcu(&new_notify->link, &box->irq_head);
     spinlock_unlock(&box->irq_lock);
     spinlock_unlock(&irq->lock);
     interrupts_restore(ipl);
  * Assume irq->lock is locked.
+ *
  */
 static void send_call(irq_t *irq, call_t *call)
+{
-    spinlock_lock(&irq->notif_cfg.answerbox->irq_lock);
+    spinlock_lock(&rcu_dereference_pointer(irq->notif_cfg).answerbox->irq_lock);
-    list_append(&call->link, &irq->notif_cfg.answerbox->irq_notifs);
+    list_append_rcu(&call->link, &rcu_dereference_pointer(irq->notif_cfg).answerbox->irq_notifs);
-    spinlock_unlock(&irq->notif_cfg.answerbox->irq_lock);
+    spinlock_unlock(&rcu_dereference_pointer(irq->notif_cfg).answerbox->irq_lock);
-    waitq_wakeup(&irq->notif_cfg.answerbox->wq, WAKEUP_FIRST);
+    waitq_wakeup(&rcu_dereference_pointer(irq->notif_cfg).answerbox->wq, WAKEUP_FIRST);
+}
 /** Send notification message
+ *
  */
+{
     call_t *call;
     spinlock_lock(&irq->lock);
-    if (irq->notif_cfg.answerbox) {
+    if (rcu_dereference_pointer(irq->notif_cfg).answerbox) {
         call = ipc_call_alloc(FRAME_ATOMIC);
         if (!call) {
             spinlock_unlock(&irq->lock);
             return;
+        }
         call->flags |= IPC_CALL_NOTIF;
-        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
+        IPC_SET_METHOD(call->data, rcu_dereference_pointer(irq->notif_cfg).method);
         IPC_SET_ARG1(call->data, a1);
         IPC_SET_ARG2(call->data, a2);
         IPC_SET_ARG3(call->data, a3);
         /* Put a counter to the message */
-        call->priv = ++irq->notif_cfg.counter;
+        call->priv = ++rcu_dereference_pointer(irq->notif_cfg).counter;
         send_call(irq, call);
+    }
     spinlock_unlock(&irq->lock);
+}
+{
     call_t *call;
     ASSERT(irq);
-    if (irq->notif_cfg.answerbox) {
+    if (rcu_dereference_pointer(irq->notif_cfg).answerbox) {
         call = ipc_call_alloc(FRAME_ATOMIC);
         if (!call) {
             return;
+        }
         call->flags |= IPC_CALL_NOTIF;
         /* Put a counter to the message */
-        call->priv = ++irq->notif_cfg.counter;
+        call->priv = ++rcu_dereference_pointer(irq->notif_cfg).counter;
         /* Set up args */
-        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
+        IPC_SET_METHOD(call->data, rcu_dereference_pointer(irq->notif_cfg).method);
         /* Execute code to handle irq */
-        code_execute(call, irq->notif_cfg.code);
+        code_execute(call, rcu_dereference_pointer(irq->notif_cfg).code);
         send_call(irq, call);
+    }
+}
  * @param box Answerbox for which we want to carry out the cleanup.
  */
 void ipc_irq_cleanup(answerbox_t *box)
+{
     ipl_t ipl;
+    ipc_notif_cfg_t *new_notify, *old_notify;
 loop:
     ipl = interrupts_disable();
     spinlock_lock(&box->irq_lock);
     while (box->irq_head.next != &box->irq_head) {
         link_t *cur = box->irq_head.next;
         irq_t *irq;
         DEADLOCK_PROBE_INIT(p_irqlock);
-        irq = list_get_instance(cur, irq_t, notif_cfg.link);
+        irq = list_get_instance(cur, irq_t, notif_cfg->link);
         if (!spinlock_trylock(&irq->lock)) {
             /*
              * Avoid deadlock by trying again.
              */
             spinlock_unlock(&box->irq_lock);
             interrupts_restore(ipl);
             DEADLOCK_PROBE(p_irqlock, DEADLOCK_THRESHOLD);
             goto loop;
+        }
-        ASSERT(irq->notif_cfg.answerbox == box);
+        ASSERT(irq->notif_cfg->answerbox == box);
-        list_remove(&irq->notif_cfg.link);
+        list_remove_rcu(&irq->notif_cfg->link);
-        /*
-         * Don't forget to free any top-half pseudocode.
+        new_notify = malloc(sizeof(ipc_notif_cfg_t),0);
-         */
-        code_free(irq->notif_cfg.code);
+        new_notify->notify = false;
-        irq->notif_cfg.notify = false;
+        new_notify->answerbox = NULL;
-        irq->notif_cfg.answerbox = NULL;
+        new_notify->method = 0;
-        irq->notif_cfg.code = NULL;
+        new_notify->code = NULL;
-        irq->notif_cfg.method = 0;
+        new_notify->counter = 0;
+        copy_link_rcu(&irq->notif_cfg->link, &new_notify->link);
-        irq->notif_cfg.counter = 0;
+        old_notify = irq->notif_cfg;
+        rcu_assign_pointer(irq->notif_cfg, new_notify);
+        rcu_sync_callback_normal_alloc(&ipc_notif_free_callback, old_notify);
         spinlock_unlock(&irq->lock);
+    }
     spinlock_unlock(&box->irq_lock);
     interrupts_restore(ipl);

Subversion Repositories HelenOS

(root)//branches/rcu/kernel/generic/src/ipc/irq.c – Rev 2307 → 2456