s390/cpuinfo: show facilities as reported by stfle

Add a new line to /proc/cpuinfo which shows all available facilities
as reported by the stfle instruction:

> cat /proc/cpuinfo
...
facilities      : 0 1 2 3 4 6 7 ...
...

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c
index c73709869447..778cd6536175 100644
--- a/arch/s390/kernel/processor.c
+++ b/arch/s390/kernel/processor.c
@@ -7,6 +7,7 @@
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
 #include <linux/cpufeature.h>
+#include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/sched/mm.h>
 #include <linux/init.h>
@@ -91,6 +92,18 @@ int cpu_have_feature(unsigned int num)
 }
 EXPORT_SYMBOL(cpu_have_feature);
 
+static void show_facilities(struct seq_file *m)
+{
+        unsigned int bit;
+        long *facilities;
+
+        facilities = (long *)&S390_lowcore.stfle_fac_list;
+        seq_puts(m, "facilities      :");
+        for_each_set_bit_inv(bit, facilities, MAX_FACILITY_BIT)
+                seq_printf(m, " %d", bit);
+        seq_putc(m, '\n');
+}
+
 static void show_cpu_summary(struct seq_file *m, void *v)
 {
         static const char *hwcap_str[] = {
@@ -116,6 +129,7 @@ static void show_cpu_summary(struct seq_file *m, void *v)
                 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
                         seq_printf(m, "%s ", int_hwcap_str[i]);
         seq_puts(m, "\n");
+        show_facilities(m);
         show_cacheinfo(m);
         for_each_online_cpu(cpu) {
                 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);