This routine essentially duplicates the swsusp_resume routine, which does
high level steps of the atomic restore. Rather than modifying that routine
to include a number of if (suspend2) else clauses, it seemed better to put
a suspend2ised version here.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/atomic_copy.c | 55 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c
index bb5d74f..e4aa9f9 100644
--- a/kernel/power/atomic_copy.c
+++ b/kernel/power/atomic_copy.c
@@ -380,3 +380,58 @@ enable_irqs:
return error;
}
+/*
+ * suspend_atomic_restore
+ *
+ * Get ready to do the atomic restore. This part gets us into the same
+ * state we are in prior to do calling do_suspend2_lowlevel while
+ * suspending: hotunplugging secondary cpus and freeze processes,
+ * before starting the thread that will do the restore.
+ */
+int suspend_atomic_restore(void)
+{
+ int error, loop;
+
+ disable_nonboot_cpus();
+
+ suspend_prepare_status(DONT_CLEAR_BAR, "Atomic restore preparation");
+ prepare_suspend2_pbe_list();
+
+ suspend_cond_pause(1, "Device suspend next.\n");
+
+ if ((error = device_suspend(PMSG_FREEZE))) {
+ printk("Some devices failed to suspend\n");
+ BUG();
+ }
+
+#ifdef CONFIG_HIGHMEM
+ origmap = pageset1_map;
+ copymap = pageset1_copy_map;
+ suspend_init_nosave_zone_table();
+#endif
+
+ state1 = suspend_action;
+ state2 = suspend_debug_state;
+ state3 = console_loglevel;
+
+ for (loop = 0; loop < 4; loop++)
+ io_speed_save[loop/2][loop%2] =
+ suspend_io_time[loop/2][loop%2];
+ memcpy(suspend_resume_commandline, saved_command_line, COMMAND_LINE_SIZE);
+
+ local_irq_disable();
+ if (device_power_down(PMSG_FREEZE))
+ printk(KERN_ERR "Some devices failed to power down. Very bad.\n");
+
+ local_irq_disable();
+
+ /* We'll ignore saved state, but this gets preempt count (etc) right */
+ save_processor_state();
+ error = swsusp_arch_resume();
+ /* Code below is only ever reached in case of failure. Otherwise
+ * execution continues at place where swsusp_arch_suspend was called.
+ */
+ BUG();
+ return 1;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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