{
device_resume();
platform_finish();
- enable_nonboot_cpus();
thaw_processes();
+ enable_nonboot_cpus();
pm_restore_console();
}
sys_sync();
+ disable_nonboot_cpus();
+
if (freeze_processes()) {
error = -EBUSY;
- return error;
+ goto thaw;
}
if (pm_disk_mode == PM_DISK_PLATFORM) {
if (pm_ops && pm_ops->prepare) {
if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
- return error;
+ goto thaw;
}
}
/* Free memory before shutting down devices. */
free_some_memory();
-
return 0;
+thaw:
+ thaw_processes();
+ enable_nonboot_cpus();
+ pm_restore_console();
+ return error;
}
static void unprepare_processes(void)
{
- enable_nonboot_cpus();
+ platform_finish();
thaw_processes();
+ enable_nonboot_cpus();
pm_restore_console();
}
{
int error;
- disable_nonboot_cpus();
- if ((error = device_suspend(PMSG_FREEZE))) {
+ if ((error = device_suspend(PMSG_FREEZE)))
printk("Some devices failed to suspend\n");
- platform_finish();
- enable_nonboot_cpus();
- return error;
- }
-
- return 0;
+ return error;
}
/**
int error;
error = prepare_processes();
- if (!error) {
- error = prepare_devices();
- }
+ if (error)
+ return error;
+ error = prepare_devices();
if (error) {
unprepare_processes();
if ((error = prepare_processes())) {
swsusp_close();
- goto Cleanup;
+ goto Done;
}
pr_debug("PM: Reading swsusp image.\n");
#include <linux/interrupt.h>
#include <linux/suspend.h>
#include <linux/module.h>
+#include <linux/cpu.h>
#include <asm/atomic.h>
#include <asm/tlbflush.h>
-static atomic_t cpu_counter, freeze;
-
-
-static void smp_pause(void * data)
-{
- struct saved_context ctxt;
- __save_processor_state(&ctxt);
- printk("Sleeping in:\n");
- dump_stack();
- atomic_inc(&cpu_counter);
- while (atomic_read(&freeze)) {
- /* FIXME: restore takes place at random piece inside this.
- This should probably be written in assembly, and
- preserve general-purpose registers, too
-
- What about stack? We may need to move to new stack here.
-
- This should better be ran with interrupts disabled.
- */
- cpu_relax();
- barrier();
- }
- atomic_dec(&cpu_counter);
- __restore_processor_state(&ctxt);
-}
-
-static cpumask_t oldmask;
+/* This is protected by pm_sem semaphore */
+static cpumask_t frozen_cpus;
void disable_nonboot_cpus(void)
{
- oldmask = current->cpus_allowed;
- set_cpus_allowed(current, cpumask_of_cpu(0));
- printk("Freezing CPUs (at %d)", raw_smp_processor_id());
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ);
- printk("...");
- BUG_ON(raw_smp_processor_id() != 0);
-
- /* FIXME: for this to work, all the CPUs must be running
- * "idle" thread (or we deadlock). Is that guaranteed? */
+ int cpu, error;
- atomic_set(&cpu_counter, 0);
- atomic_set(&freeze, 1);
- smp_call_function(smp_pause, NULL, 0, 0);
- while (atomic_read(&cpu_counter) < (num_online_cpus() - 1)) {
- cpu_relax();
- barrier();
+ error = 0;
+ cpus_clear(frozen_cpus);
+ printk("Freezing cpus ...\n");
+ for_each_online_cpu(cpu) {
+ if (cpu == 0)
+ continue;
+ error = cpu_down(cpu);
+ if (!error) {
+ cpu_set(cpu, frozen_cpus);
+ printk("CPU%d is down\n", cpu);
+ continue;
+ }
+ printk("Error taking cpu %d down: %d\n", cpu, error);
}
- printk("ok\n");
+ BUG_ON(smp_processor_id() != 0);
+ if (error)
+ panic("cpus not sleeping");
}
void enable_nonboot_cpus(void)
{
- printk("Restarting CPUs");
- atomic_set(&freeze, 0);
- while (atomic_read(&cpu_counter)) {
- cpu_relax();
- barrier();
- }
- printk("...");
- set_cpus_allowed(current, oldmask);
- schedule();
- printk("ok\n");
+ int cpu, error;
+ printk("Thawing cpus ...\n");
+ for_each_cpu_mask(cpu, frozen_cpus) {
+ error = smp_prepare_cpu(cpu);
+ if (!error)
+ error = cpu_up(cpu);
+ if (!error) {
+ printk("CPU%d is up\n", cpu);
+ continue;
+ }
+ printk("Error taking cpu %d up: %d\n", cpu, error);
+ panic("Not enough cpus");
+ }
+ cpus_clear(frozen_cpus);
}
-
projects / linux-2.6 / commitdiff