[SRU cosmic-aws][PATCH 2/6] xen/manage: introduce helper function to know the on-going suspend mode

[Daniel Axtens]

From: Munehisa Kamata <kamatam at amazon.com>

BugLink: https://bugs.launchpad.net/bugs/1801305

Introduce simple functions which help to know the on-going suspend mode
so that other Xen-related code can behave differently according to the
current suspend mode.

Signed-off-by: Munehisa Kamata <kamatam at amazon.com>
Signed-off-by: Anchal Agarwal <anchalag at amazon.com>
Reviewed-by: Alakesh Haloi <alakeshh at amazon.com>
Reviewed-by: Sebastian Biemueller <sbiemue at amazon.com>
Reviewed-by: Munehisa Kamata <kamatam at amazon.com>
Reviewed-by: Eduardo Valentin <eduval at amazon.com>
CR: https://cr.amazon.com/r/8273190/
(cherry-picked from
 0014-xen-manage-introduce-helper-function-to-know-the-on-.patch
 in AWS 4.14 kernel SRPM)
Signed-off-by: Daniel Axtens <daniel.axtens at canonical.com>
---
 drivers/xen/manage.c  | 15 +++++++++++++++
 include/xen/xen-ops.h |  4 ++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index efdcb6fe34b4..5562aba04e16 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -50,6 +50,21 @@ enum suspend_modes {
 /* Protected by pm_mutex */
 static enum suspend_modes suspend_mode = NO_SUSPEND;
 
+bool xen_suspend_mode_is_xen_suspend(void)
+{
+	return suspend_mode == XEN_SUSPEND;
+}
+
+bool xen_suspend_mode_is_pm_suspend(void)
+{
+	return suspend_mode == PM_SUSPEND;
+}
+
+bool xen_suspend_mode_is_pm_hibernation(void)
+{
+	return suspend_mode == PM_HIBERNATION;
+}
+
 struct suspend_info {
 	int cancelled;
 };
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index fd18c974a619..6ca7cbf2c5b4 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -39,6 +39,10 @@ u64 xen_steal_clock(int cpu);
 
 int xen_setup_shutdown_event(void);
 
+bool xen_suspend_mode_is_xen_suspend(void);
+bool xen_suspend_mode_is_pm_suspend(void);
+bool xen_suspend_mode_is_pm_hibernation(void);
+
 extern unsigned long *xen_contiguous_bitmap;
 
 #ifdef CONFIG_XEN_PV
-- 
2.17.1