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cpus: protect work list with work_mutex

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Protect the list of queued work items with something other than
the BQL, as a preparation for running the work items outside it.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2015-07-10 12:32:32 +02:00
parent 0c71d41e2a
commit 376692b9dc
3 changed files with 24 additions and 5 deletions
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22
cpus.c
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@ -819,6 +819,8 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
wi.func = func;
wi.data = data;
wi.free = false;
qemu_mutex_lock(&cpu->work_mutex);
if (cpu->queued_work_first == NULL) {
cpu->queued_work_first = &wi;
} else {
@ -827,9 +829,10 @@ void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
cpu->queued_work_last = &wi;
wi.next = NULL;
wi.done = false;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cpu_kick(cpu);
while (!wi.done) {
while (!atomic_mb_read(&wi.done)) {
CPUState *self_cpu = current_cpu;
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
@ -850,6 +853,8 @@ void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
wi->func = func;
wi->data = data;
wi->free = true;
qemu_mutex_lock(&cpu->work_mutex);
if (cpu->queued_work_first == NULL) {
cpu->queued_work_first = wi;
} else {
@ -858,6 +863,7 @@ void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
cpu->queued_work_last = wi;
wi->next = NULL;
wi->done = false;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cpu_kick(cpu);
}
@ -870,15 +876,23 @@ static void flush_queued_work(CPUState *cpu)
return;
}
while ((wi = cpu->queued_work_first)) {
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;
}
qemu_mutex_unlock(&cpu->work_mutex);
wi->func(wi->data);
wi->done = true;
qemu_mutex_lock(&cpu->work_mutex);
if (wi->free) {
g_free(wi);
} else {
atomic_mb_set(&wi->done, true);
}
}
cpu->queued_work_last = NULL;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cond_broadcast(&qemu_work_cond);
}