[S390] zcore: Add prefix registers to dump header

With this patch the prefix registers of all online CPUs are stored in the
the zcore dump header. This allows dump analysis tools to access the register
information that is stored in the prefix pages without using the System.map.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/zcore.c

@@ -204,7 +204,7 @@ static int __init init_cpu_info(enum arch_id arch)
 
 static DEFINE_MUTEX(zcore_mutex);
 
-#define DUMP_VERSION	0x3
+#define DUMP_VERSION	0x5
 #define DUMP_MAGIC	0xa8190173618f23fdULL
 #define DUMP_ARCH_S390X	2
 #define DUMP_ARCH_S390	1
@@ -229,7 +229,14 @@ struct zcore_header {
 	u32 volnr;
 	u32 build_arch;
 	u64 rmem_size;
-	char pad2[4016];
+	u8 mvdump;
+	u16 cpu_cnt;
+	u16 real_cpu_cnt;
+	u8 end_pad1[0x200-0x061];
+	u64 mvdump_sign;
+	u64 mvdump_zipl_time;
+	u8 end_pad2[0x800-0x210];
+	u32 lc_vec[512];
 } __attribute__((packed,__aligned__(16)));
 
 static struct zcore_header zcore_header = {
@@ -608,8 +615,9 @@ static int __init get_mem_size(unsigned long *mem)
 
 static int __init zcore_header_init(int arch, struct zcore_header *hdr)
 {
-	int rc;
+	int rc, i;
 	unsigned long memory = 0;
+	u32 prefix;
 
 	if (arch == ARCH_S390X)
 		hdr->arch_id = DUMP_ARCH_S390X;
@@ -624,6 +632,14 @@ static int __init zcore_header_init(int arch, struct zcore_header *hdr)
 	hdr->num_pages = memory / PAGE_SIZE;
 	hdr->tod = get_clock();
 	get_cpu_id(&hdr->cpu_id);
+	for (i = 0; zfcpdump_save_areas[i]; i++) {
+		prefix = zfcpdump_save_areas[i]->pref_reg;
+		hdr->real_cpu_cnt++;
+		if (!prefix)
+			continue;
+		hdr->lc_vec[hdr->cpu_cnt] = prefix;
+		hdr->cpu_cnt++;
+	}
 	return 0;
 }