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cpus-common: move CPU work item management to common code

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Make CPU work core functions common between system and user-mode
emulation. User-mode does not use run_on_cpu, so do not implement it.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <1470158864-17651-10-git-send-email-alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sergey Fedorov 2016-08-29 09:51:00 +02:00 • committed by Paolo Bonzini
parent 267f685b8b
commit d148d90ee8
5 changed files with 148 additions and 91 deletions
Download patch file Download diff file Expand all files Collapse all files

94
cpus-common.c
View file

@ -23,10 +23,12 @@
#include "sysemu/cpus.h"
static QemuMutex qemu_cpu_list_lock;
static QemuCond qemu_work_cond;
void qemu_init_cpu_list(void)
{
qemu_mutex_init(&qemu_cpu_list_lock);
qemu_cond_init(&qemu_work_cond);
}
void cpu_list_lock(void)
@ -81,3 +83,95 @@ void cpu_list_remove(CPUState *cpu)
cpu->cpu_index = UNASSIGNED_CPU_INDEX;
qemu_mutex_unlock(&qemu_cpu_list_lock);
}
struct qemu_work_item {
struct qemu_work_item *next;
run_on_cpu_func func;
void *data;
int done;
bool free;
};
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;
wi->done = false;
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cpu_kick(cpu);
}
void do_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data,
QemuMutex *mutex)
{
struct qemu_work_item wi;
if (qemu_cpu_is_self(cpu)) {
func(cpu, data);
return;
}
wi.func = func;
wi.data = data;
wi.free = false;
queue_work_on_cpu(cpu, &wi);
while (!atomic_mb_read(&wi.done)) {
CPUState *self_cpu = current_cpu;
qemu_cond_wait(&qemu_work_cond, mutex);
current_cpu = self_cpu;
}
}
void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
{
struct qemu_work_item *wi;
if (qemu_cpu_is_self(cpu)) {
func(cpu, data);
return;
}
wi = g_malloc0(sizeof(struct qemu_work_item));
wi->func = func;
wi->data = data;
wi->free = true;
queue_work_on_cpu(cpu, wi);
}
void process_queued_cpu_work(CPUState *cpu)
{
struct qemu_work_item *wi;
if (cpu->queued_work_first == NULL) {
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;
}
qemu_mutex_unlock(&cpu->work_mutex);
wi->func(cpu, wi->data);
qemu_mutex_lock(&cpu->work_mutex);
if (wi->free) {
g_free(wi);
} else {
atomic_mb_set(&wi->done, true);
}
}
qemu_mutex_unlock(&cpu->work_mutex);
qemu_cond_broadcast(&qemu_work_cond);
}