Stage one of multipass suspend/resume

Summary:
Add the beginnings of multipass suspend/resume, by introducing
BUS_SUSPEND_CHILD/BUS_RESUME_CHILD, and move the PCI driver to this.

Reviewers: jhb

Reviewed By: jhb

Differential Revision: https://reviews.freebsd.org/D590

1 files changed, 22 insertions, 0 deletions

diff --git a/sys/kern/bus_if.m b/sys/kern/bus_if.m
index b0ad611..ccc854c 100644
--- a/sys/kern/bus_if.m
+++ b/sys/kern/bus_if.m
@@ -670,3 +670,25 @@ METHOD int remap_intr {
 	device_t	_child;
 	u_int		_irq;
 } DEFAULT null_remap_intr;
+
+/**
+ * @brief Suspend a given child
+ *
+ * @param _dev		the parent device of @p _child
+ * @param _child	the device to suspend
+ */
+METHOD int suspend_child {
+	device_t	_dev;
+	device_t	_child;
+} DEFAULT bus_generic_suspend_child;
+
+/**
+ * @brief Resume a given child
+ *
+ * @param _dev		the parent device of @p _child
+ * @param _child	the device to resume
+ */
+METHOD int resume_child {
+	device_t	_dev;
+	device_t	_child;
+} DEFAULT bus_generic_resume_child;