Add pci_save_state() and pci_restore_state() wrappers around

pci_cfg_save() and pci_cfg_restore() for device drivers to use when
saving and restoring state (e.g. to handle device-specific resets).

Reviewed by:	imp
MFC after:	2 weeks

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 584c9c3..e62babb 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -4426,3 +4426,22 @@ pci_cfg_save(device_t dev, struct pci_devinfo *dinfo, int setstate)
 	if (pci_get_powerstate(dev) != PCI_POWERSTATE_D3)
 		pci_set_powerstate(dev, PCI_POWERSTATE_D3);
 }
+
+/* Wrapper APIs suitable for device driver use. */
+void
+pci_save_state(device_t dev)
+{
+	struct pci_devinfo *dinfo;
+
+	dinfo = device_get_ivars(dev);
+	pci_cfg_save(dev, dinfo, 0);
+}
+
+void
+pci_restore_state(device_t dev)
+{
+	struct pci_devinfo *dinfo;
+
+	dinfo = device_get_ivars(dev);
+	pci_cfg_restore(dev, dinfo);
+}