s390: add SMT support

The multi-threading facility is introduced with the z13 processor family.
This patch adds code to detect the multi-threading facility. With the
facility enabled each core will surface multiple hardware threads to the
system. Each hardware threads looks like a normal CPU to the operating
system with all its registers and properties.

The SCLP interface reports the SMT topology indirectly via the maximum
thread id. Each reported CPU in the result of a read-scp-information
is a core representing a number of hardware threads.

To reflect the reduced CPU capacity if two hardware threads run on a
single core the MT utilization counter set is used to normalize the
raw cputime obtained by the CPU timer deltas. This scaled cputime is
reported via the taskstats interface. The normal /proc/stat numbers
are based on the raw cputime and are not affected by the normalization.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/s390/kernel/sysinfo.c b/arch/s390/kernel/sysinfo.c
index 811f542b8ed4..85565f1ff474 100644
--- a/arch/s390/kernel/sysinfo.c
+++ b/arch/s390/kernel/sysinfo.c
@@ -194,6 +194,14 @@ static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
         seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
         seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
         seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
+        if (info->mt_installed & 0x80) {
+                seq_printf(m, "LPAR CPUs G-MTID:     %d\n",
+                           info->mt_general & 0x1f);
+                seq_printf(m, "LPAR CPUs S-MTID:     %d\n",
+                           info->mt_installed & 0x1f);
+                seq_printf(m, "LPAR CPUs PS-MTID:    %d\n",
+                           info->mt_psmtid & 0x1f);
+        }
 }
 
 static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)