/*
* Snapshot kernel memory and reset the system.
*
* swsusp_save() is executed in the suspend finisher so that the CPU
* context pointer and memory are part of the saved image, which is
* required by the resume kernel image to restart execution from
* swsusp_arch_suspend().
*
* soft_restart is not technically needed, but is used to get success
* returned from cpu_suspend.
*
* When soft reboot completes, the hibernation snapshot is written out.
*/
static int notrace arch_save_image(unsigned long unused)
{
int ret;
ret = swsusp_save();
if (ret == 0)
soft_restart(virt_to_phys(cpu_resume));
return ret;
}
/*
* Snapshot kernel memory and reset the system.
* After resume, the hibernation snapshot is written out.
*/
static int notrace __swsusp_arch_save_image(unsigned long unused)
{
extern int swsusp_save(void);
int ret;
ret = swsusp_save();
swsusp_saved = (ret == 0) ? 1 : 0;
return ret;
}
/*
* Snapshot kernel memory and reset the system.
*
* swsusp_save() is executed in the suspend finisher so that the CPU
* context pointer and memory are part of the saved image, which is
* required by the resume kernel image to restart execution from
* swsusp_arch_suspend().
*
* soft_restart is not technically needed, but is used to get success
* returned from cpu_suspend.
*
* When soft reboot completes, the hibernation snapshot is written out.
*/
static int notrace arch_save_image(unsigned long unused)
{
int ret;
ret = swsusp_save();
#ifdef CONFIG_MTK_HIBERNATION
swsusp_saved = (ret == 0) ? 1 : 0;
#else
if (ret == 0)
_soft_restart(virt_to_phys(cpu_resume), false);
#endif
return ret;
}
int swsusp_arch_suspend(void)
{
int ret = 0;
unsigned long flags;
struct sleep_stack_data state;
if (cpus_are_stuck_in_kernel()) {
pr_err("Can't hibernate: no mechanism to offline secondary CPUs.\n");
return -EBUSY;
}
flags = local_daif_save();
if (__cpu_suspend_enter(&state)) {
/* make the crash dump kernel image visible/saveable */
crash_prepare_suspend();
sleep_cpu = smp_processor_id();
ret = swsusp_save();
} else {
/* Clean kernel core startup/idle code to PoC*/
dcache_clean_range(__mmuoff_data_start, __mmuoff_data_end);
dcache_clean_range(__idmap_text_start, __idmap_text_end);
/* Clean kvm setup code to PoC? */
if (el2_reset_needed())
dcache_clean_range(__hyp_idmap_text_start, __hyp_idmap_text_end);
/* make the crash dump kernel image protected again */
crash_post_resume();
/*
* Tell the hibernation core that we've just restored
* the memory
*/
in_suspend = 0;
sleep_cpu = -EINVAL;
__cpu_suspend_exit();
}
local_daif_restore(flags);
return ret;
}
