s390/sysinfo: show partition extended name and UUID if available

Extract extended name and UUID from SYSIB 2.2.2 data.
As the code to convert the raw extended name into printable format
can be reused by stsi_2_2_2 we're moving the conversion code into a
separate function convert_ext_name.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/sysinfo.h

@@ -107,6 +107,11 @@ struct sysinfo_2_2_2 {
 	char reserved_3[5];
 	unsigned short cpus_dedicated;
 	unsigned short cpus_shared;
+	char reserved_4[3];
+	unsigned char vsne;
+	uuid_be uuid;
+	char reserved_5[160];
+	char ext_name[256];
 };
 
 #define LPAR_CHAR_DEDICATED	(1 << 7)
@@ -127,7 +132,7 @@ struct sysinfo_3_2_2 {
 		unsigned int caf;
 		char cpi[16];
 		char reserved_1[3];
-		char ext_name_encoding;
+		unsigned char evmne;
 		unsigned int reserved_2;
 		uuid_be uuid;
 	} vm[8];

arch/s390/kernel/sysinfo.c

@@ -56,6 +56,20 @@ int stsi(void *sysinfo, int fc, int sel1, int sel2)
 }
 EXPORT_SYMBOL(stsi);
 
+static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
+{
+	switch (encoding) {
+	case 1: /* EBCDIC */
+		EBCASC(name, len);
+		break;
+	case 2:	/* UTF-8 */
+		break;
+	default:
+		return false;
+	}
+	return true;
+}
+
 static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
 {
 	int i;
@@ -207,24 +221,19 @@ static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
 		seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
 		seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
 	}
+	if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
+		seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
+		seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
+	}
 }
 
 static void print_ext_name(struct seq_file *m, int lvl,
 			   struct sysinfo_3_2_2 *info)
 {
-	if (info->vm[lvl].ext_name_encoding == 0)
-		return;
-	if (info->ext_names[lvl][0] == 0)
-		return;
-	switch (info->vm[lvl].ext_name_encoding) {
-	case 1: /* EBCDIC */
-		EBCASC(info->ext_names[lvl], sizeof(info->ext_names[lvl]));
-		break;
-	case 2:	/* UTF-8 */
-		break;
-	default:
+	size_t len = sizeof(info->ext_names[lvl]);
+
+	if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
 		return;
-	}
 	seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
 		   info->ext_names[lvl]);
 }