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[mirror_qemu.git] / cpus-common.c

diff --git a/cpus-common.c b/cpus-common.c
index 70a9d12981a243fd8134cabcb6a93002f00c3726..6e73d3e58dac6b6f4e117d56f5020d8496f17439 100644 (file)
--- a/cpus-common.c
+++ b/cpus-common.c
@@ -6,7 +6,7 @@
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -72,6 +72,8 @@ static int cpu_get_free_index(void)
     return max_cpu_index;
 }
 
+CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
+
 void cpu_list_add(CPUState *cpu)
 {
     QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
@@ -96,8 +98,24 @@ void cpu_list_remove(CPUState *cpu)
     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 }
 
+CPUState *qemu_get_cpu(int index)
+{
+    CPUState *cpu;
+
+    CPU_FOREACH(cpu) {
+        if (cpu->cpu_index == index) {
+            return cpu;
+        }
+    }
+
+    return NULL;
+}
+
+/* current CPU in the current thread. It is only valid inside cpu_exec() */
+__thread CPUState *current_cpu;
+
 struct qemu_work_item {
-    struct qemu_work_item *next;
+    QSIMPLEQ_ENTRY(qemu_work_item) node;
     run_on_cpu_func func;
     run_on_cpu_data data;
     bool free, exclusive, done;
@@ -106,13 +124,7 @@ struct qemu_work_item {
 static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi)
 {
     qemu_mutex_lock(&cpu->work_mutex);
-    if (cpu->queued_work_first == NULL) {
-        cpu->queued_work_first = wi;
-    } else {
-        cpu->queued_work_last->next = wi;
-    }
-    cpu->queued_work_last = wi;
-    wi->next = NULL;
+    QSIMPLEQ_INSERT_TAIL(&cpu->work_list, wi, node);
     wi->done = false;
     qemu_mutex_unlock(&cpu->work_mutex);
 
@@ -136,7 +148,7 @@ void do_run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data,
     wi.exclusive = false;
 
     queue_work_on_cpu(cpu, &wi);
-    while (!atomic_mb_read(&wi.done)) {
+    while (!qatomic_mb_read(&wi.done)) {
         CPUState *self_cpu = current_cpu;
 
         qemu_cond_wait(&qemu_work_cond, mutex);
@@ -176,20 +188,20 @@ void start_exclusive(void)
     exclusive_idle();
 
     /* Make all other cpus stop executing.  */
-    atomic_set(&pending_cpus, 1);
+    qatomic_set(&pending_cpus, 1);
 
     /* Write pending_cpus before reading other_cpu->running.  */
     smp_mb();
     running_cpus = 0;
     CPU_FOREACH(other_cpu) {
-        if (atomic_read(&other_cpu->running)) {
+        if (qatomic_read(&other_cpu->running)) {
             other_cpu->has_waiter = true;
             running_cpus++;
             qemu_cpu_kick(other_cpu);
         }
     }
 
-    atomic_set(&pending_cpus, running_cpus + 1);
+    qatomic_set(&pending_cpus, running_cpus + 1);
     while (pending_cpus > 1) {
         qemu_cond_wait(&exclusive_cond, &qemu_cpu_list_lock);
     }
@@ -208,7 +220,7 @@ void end_exclusive(void)
     current_cpu->in_exclusive_context = false;
 
     qemu_mutex_lock(&qemu_cpu_list_lock);
-    atomic_set(&pending_cpus, 0);
+    qatomic_set(&pending_cpus, 0);
     qemu_cond_broadcast(&exclusive_resume);
     qemu_mutex_unlock(&qemu_cpu_list_lock);
 }
@@ -216,7 +228,7 @@ void end_exclusive(void)
 /* Wait for exclusive ops to finish, and begin cpu execution.  */
 void cpu_exec_start(CPUState *cpu)
 {
-    atomic_set(&cpu->running, true);
+    qatomic_set(&cpu->running, true);
 
     /* Write cpu->running before reading pending_cpus.  */
     smp_mb();
@@ -234,17 +246,17 @@ void cpu_exec_start(CPUState *cpu)
      * 3. pending_cpus == 0.  Then start_exclusive is definitely going to
      * see cpu->running == true, and it will kick the CPU.
      */
-    if (unlikely(atomic_read(&pending_cpus))) {
+    if (unlikely(qatomic_read(&pending_cpus))) {
         QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
         if (!cpu->has_waiter) {
             /* Not counted in pending_cpus, let the exclusive item
              * run.  Since we have the lock, just set cpu->running to true
              * while holding it; no need to check pending_cpus again.
              */
-            atomic_set(&cpu->running, false);
+            qatomic_set(&cpu->running, false);
             exclusive_idle();
             /* Now pending_cpus is zero.  */
-            atomic_set(&cpu->running, true);
+            qatomic_set(&cpu->running, true);
         } else {
             /* Counted in pending_cpus, go ahead and release the
              * waiter at cpu_exec_end.
@@ -256,7 +268,7 @@ void cpu_exec_start(CPUState *cpu)
 /* Mark cpu as not executing, and release pending exclusive ops.  */
 void cpu_exec_end(CPUState *cpu)
 {
-    atomic_set(&cpu->running, false);
+    qatomic_set(&cpu->running, false);
 
     /* Write cpu->running before reading pending_cpus.  */
     smp_mb();
@@ -276,11 +288,11 @@ void cpu_exec_end(CPUState *cpu)
      * see cpu->running == false, and it can ignore this CPU until the
      * next cpu_exec_start.
      */
-    if (unlikely(atomic_read(&pending_cpus))) {
+    if (unlikely(qatomic_read(&pending_cpus))) {
         QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
         if (cpu->has_waiter) {
             cpu->has_waiter = false;
-            atomic_set(&pending_cpus, pending_cpus - 1);
+            qatomic_set(&pending_cpus, pending_cpus - 1);
             if (pending_cpus == 1) {
                 qemu_cond_signal(&exclusive_cond);
             }
@@ -306,17 +318,14 @@ void process_queued_cpu_work(CPUState *cpu)
 {
     struct qemu_work_item *wi;
 
-    if (cpu->queued_work_first == NULL) {
+    qemu_mutex_lock(&cpu->work_mutex);
+    if (QSIMPLEQ_EMPTY(&cpu->work_list)) {
+        qemu_mutex_unlock(&cpu->work_mutex);
         return;
     }
-
-    qemu_mutex_lock(&cpu->work_mutex);
-    while (cpu->queued_work_first != NULL) {
-        wi = cpu->queued_work_first;
-        cpu->queued_work_first = wi->next;
-        if (!cpu->queued_work_first) {
-            cpu->queued_work_last = NULL;
-        }
+    while (!QSIMPLEQ_EMPTY(&cpu->work_list)) {
+        wi = QSIMPLEQ_FIRST(&cpu->work_list);
+        QSIMPLEQ_REMOVE_HEAD(&cpu->work_list, node);
         qemu_mutex_unlock(&cpu->work_mutex);
         if (wi->exclusive) {
             /* Running work items outside the BQL avoids the following deadlock:
@@ -337,7 +346,7 @@ void process_queued_cpu_work(CPUState *cpu)
         if (wi->free) {
             g_free(wi);
         } else {
-            atomic_mb_set(&wi->done, true);
+            qatomic_mb_set(&wi->done, true);
         }
     }
     qemu_mutex_unlock(&cpu->work_mutex);