[PATCH 2/2] powerpc/pseries/mobility: add pr_debug for device tree changes

[Nathan Lynch <nathanl@linux.ibm.com>]

When investigating issues with partition migration or resource
reassignments it is helpful to have a log of which nodes and
properties in the device tree have changed. Use pr_debug() so it's
easy to enable these at runtime with the dynamic debug facility.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/mobility.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index f9a1287925a8..5270ac00279b 100644
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -69,6 +69,8 @@ static int delete_dt_node(__be32 phandle)
 	if (!dn)
 		return -ENOENT;
 
+	pr_debug("removing node %pOFfp\n", dn);
+
 	dlpar_detach_node(dn);
 	of_node_put(dn);
 	return 0;
@@ -127,6 +129,7 @@ static int update_dt_property(struct device_node *dn, struct property **prop,
 	}
 
 	if (!more) {
+		pr_debug("updating node %pOF property %s\n", dn, name);
 		of_update_property(dn, new_prop);
 		*prop = NULL;
 	}
@@ -241,6 +244,8 @@ static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
 	if (rc)
 		dlpar_free_cc_nodes(dn);
 
+	pr_debug("added node %pOFfp\n", dn);
+
 	of_node_put(parent_dn);
 	return rc;
 }
@@ -256,6 +261,7 @@ static void prrn_update_node(__be32 phandle)
 	 */
 	dn = of_find_node_by_phandle(be32_to_cpu(phandle));
 	if (dn) {
+		pr_debug("ignoring PRRN for %pOFfp\n", dn);
 		of_node_put(dn);
 		return;
 	}
@@ -265,6 +271,8 @@ static void prrn_update_node(__be32 phandle)
 	hp_elog.id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
 	hp_elog._drc_u.drc_index = phandle;
 
+	pr_debug("handling PRRN for LMB DRC index 0x%x\n", be32_to_cpu(phandle));
+
 	handle_dlpar_errorlog(&hp_elog);
 }
 
-- 
2.20.1