s390/setup: set control program code via diag 318

The s390x diagnose 318 instruction sets the control program name code (CPNC)
and control program version code (CPVC) to provide useful information
regarding the OS during debugging. The CPNC is explicitly set to 4 to
indicate a Linux/KVM environment.

The CPVC is a 7-byte value containing:

 - 3-byte Linux version code, currently set to 0
 - 3-byte unique value, currently set to 0
 - 1-byte trailing null

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1544135405-22385-2-git-send-email-walling@linux.ibm.com>
[set version code to 0 until the structure is fully defined]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/s390/include/asm/diag.h b/arch/s390/include/asm/diag.h
index cdbaad50c7c7..19562be22b7e 100644
--- a/arch/s390/include/asm/diag.h
+++ b/arch/s390/include/asm/diag.h
@@ -32,6 +32,7 @@ enum diag_stat_enum {
 	DIAG_STAT_X2FC,
 	DIAG_STAT_X304,
 	DIAG_STAT_X308,
+	DIAG_STAT_X318,
 	DIAG_STAT_X500,
 	NR_DIAG_STAT
 };
@@ -293,6 +294,17 @@ struct diag26c_mac_resp {
 	u8	res[2];
 } __aligned(8);
 
+#define CPNC_LINUX		0x4
+union diag318_info {
+	unsigned long val;
+	struct {
+		unsigned int cpnc : 8;
+		unsigned int cpvc_linux : 24;
+		unsigned char cpvc_distro[3];
+		unsigned char zero;
+	};
+};
+
 int diag204(unsigned long subcode, unsigned long size, void *addr);
 int diag224(void *ptr);
 int diag26c(void *req, void *resp, enum diag26c_sc subcode);