[S390] sclp: Test facility list before executing a service call.

Check if a command is available before executing. Saves some
superfluous service calls that won't succeed anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index cb5888f79007..c7318a125852 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -79,6 +79,11 @@ struct sccb_header {
         u16     response_code;
 } __attribute__((packed));
 
+extern u64 sclp_facilities;
+
+#define SCLP_HAS_CHP_INFO       (sclp_facilities & 0x8000000000000000ULL)
+#define SCLP_HAS_CHP_RECONFIG   (sclp_facilities & 0x2000000000000000ULL)
+
 struct gds_subvector {
         u8      length;
         u8      key;