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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdint.h>
#include <stdlib.h>
#include <arch/lib_helpers.h>
#include <cpu/cpu.h>
#include <console/console.h>
#include "cpu-internal.h"
struct cpu_info cpu_infos[CONFIG_MAX_CPUS];
struct cpu_info *bsp_cpu_info;
struct cpu_info *cpu_info(void)
{
return cpu_info_for_cpu(smp_processor_id());
}
size_t cpus_online(void)
{
int i;
size_t num = 0;
for (i = 0; i < ARRAY_SIZE(cpu_infos); i++) {
if (cpu_online(cpu_info_for_cpu(i)))
num++;
}
return num;
}
static inline int action_queue_empty(struct cpu_action_queue *q)
{
return load_acquire_exclusive(&q->todo) == NULL;
}
static inline int action_completed(struct cpu_action_queue *q,
struct cpu_action *action)
{
return load_acquire(&q->completed) == action;
}
static inline void wait_for_action_queue_slot(struct cpu_action_queue *q)
{
while (!action_queue_empty(q))
wfe();
}
static void wait_for_action_complete(struct cpu_action_queue *q,
struct cpu_action *a)
{
while (!action_completed(q, a))
wfe();
}
static struct cpu_action *wait_for_action(struct cpu_action_queue *q,
struct cpu_action *local)
{
struct cpu_action *action;
while (action_queue_empty(q))
wfe();
/*
* Keep original address, but use a local copy for async processing.
*/
do {
action = load_acquire_exclusive(&q->todo);
*local = *action;
} while (!store_release_exclusive(&q->todo, NULL));
return action;
}
static void queue_action(struct cpu_action_queue *q, struct cpu_action *action)
{
do {
wait_for_action_queue_slot(q);
if (load_acquire_exclusive(&q->todo) != NULL)
continue;
} while (!store_release_exclusive(&q->todo, action));
}
static void action_queue_complete(struct cpu_action_queue *q,
struct cpu_action *action)
{
/* Mark completion and send events to waiters. */
store_release(&q->completed, action);
sev();
}
static void action_run(struct cpu_action *action)
{
action->run(action->arg);
}
static void action_run_on_cpu(struct cpu_info *ci, struct cpu_action *action,
int sync)
{
struct cpu_action_queue *q = &ci->action_queue;
/* Don't run actions on non-online cpus. */
if (!cpu_online(ci))
return;
if (ci->id == smp_processor_id()) {
action->run(action->arg);
return;
}
queue_action(q, action);
/* Wait for CPU to pick it up. Empty slot means it was picked up. */
wait_for_action_queue_slot(q);
/* Wait for completion if requested. */
if (sync)
wait_for_action_complete(q, action);
}
static int __arch_run_on_cpu(unsigned int cpu, struct cpu_action *action,
int sync)
{
struct cpu_info *ci;
if (cpu >= CONFIG_MAX_CPUS)
return -1;
ci = cpu_info_for_cpu(cpu);
action_run_on_cpu(ci, action, sync);
return 0;
}
int arch_run_on_cpu(unsigned int cpu, struct cpu_action *action)
{
return __arch_run_on_cpu(cpu, action, 1);
}
int arch_run_on_cpu_async(unsigned int cpu, struct cpu_action *action)
{
return __arch_run_on_cpu(cpu, action, 0);
}
static int __arch_run_on_all_cpus(struct cpu_action *action, int sync)
{
int i;
for (i = 0; i < CONFIG_MAX_CPUS; i++)
action_run_on_cpu(cpu_info_for_cpu(i), action, sync);
return 0;
}
static int __arch_run_on_all_cpus_but_self(struct cpu_action *action, int sync)
{
int i;
struct cpu_info *me = cpu_info();
for (i = 0; i < CONFIG_MAX_CPUS; i++) {
struct cpu_info *ci = cpu_info_for_cpu(i);
if (ci == me)
continue;
action_run_on_cpu(ci, action, sync);
}
return 0;
}
int arch_run_on_all_cpus(struct cpu_action *action)
{
return __arch_run_on_all_cpus(action, 1);
}
int arch_run_on_all_cpus_async(struct cpu_action *action)
{
return __arch_run_on_all_cpus(action, 0);
}
int arch_run_on_all_cpus_but_self(struct cpu_action *action)
{
return __arch_run_on_all_cpus_but_self(action, 1);
}
int arch_run_on_all_cpus_but_self_async(struct cpu_action *action)
{
return __arch_run_on_all_cpus_but_self(action, 0);
}
void arch_cpu_wait_for_action(void)
{
struct cpu_info *ci = cpu_info();
struct cpu_action_queue *q = &ci->action_queue;
while (1) {
struct cpu_action *orig;
struct cpu_action action;
orig = wait_for_action(q, &action);
action_run(&action);
action_queue_complete(q, orig);
}
}
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