occ-sensors: Check if OCC is reset while reading inband sensors

OCC may not be able to mark the sensor buffer as invalid while going
down RESET. If OCC never comes back we will continue to read the stale
sensor data. So verify if OCC is reset while reading the sensor values
and propagate the appropriate error.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/hw/occ-sensor.c b/hw/occ-sensor.c
index c062f64..0337294 100644
--- a/hw/occ-sensor.c
+++ b/hw/occ-sensor.c
@@ -265,6 +265,9 @@ int occ_sensor_read(u32 handle, u64 *data)
 	if (attr > MAX_SENSOR_ATTR)
 		return OPAL_PARAMETER;
 
+	if (is_occ_reset())
+		return OPAL_HARDWARE;
+
 	hb = get_sensor_header_block(occ_num);
 
 	if (hb->valid != 1)
diff --git a/hw/occ.c b/hw/occ.c
index 60e176c..1d5581f 100644
--- a/hw/occ.c
+++ b/hw/occ.c
@@ -876,6 +876,11 @@ static inline u8 get_cpu_throttle(struct proc_chip *chip)
 	};
 }
 
+bool is_occ_reset(void)
+{
+	return occ_reset;
+}
+
 static void occ_throttle_poll(void *data __unused)
 {
 	struct proc_chip *chip;