Subject: [PATCH 1/2] dlpar.c: introduce dlpar_unisolate_drc()

From: Daniel Henrique Barboza <[email-masked]>
Date: Fri, 16 Apr 2021 18:02:15 -0300

Next patch will execute a set-indicator call in hotplug-cpu.c.

Create a dlpar_unisolate_drc() helper to avoid spreading more
rtas_set_indicator() calls outside of dlpar.c.

Signed-off-by: Daniel Henrique Barboza <[email-masked]>
---
 arch/powerpc/platforms/pseries/dlpar.c   | 14 ++++++++++++++
 arch/powerpc/platforms/pseries/pseries.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index 233503fcf8f0..3ac70790ec7a 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -329,6 +329,20 @@ int dlpar_release_drc(u32 drc_index)
 	return 0;
 }
 
+int dlpar_unisolate_drc(u32 drc_index)
+{
+	int dr_status, rc;
+
+	rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
+				DR_ENTITY_SENSE, drc_index);
+	if (rc || dr_status != DR_ENTITY_PRESENT)
+		return -1;
+
+	rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
+
+	return 0;
+}
+
 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
 {
 	int rc;
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 4fe48c04c6c2..4ea12037c920 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -55,6 +55,7 @@ extern int dlpar_attach_node(struct device_node *, struct device_node *);
 extern int dlpar_detach_node(struct device_node *);
 extern int dlpar_acquire_drc(u32 drc_index);
 extern int dlpar_release_drc(u32 drc_index);
+extern int dlpar_unisolate_drc(u32 drc_index);
 
 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog);
 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_errlog);
-- 
2.30.2