[kvm-unit-tests PULL 02/17] s390x: Diag288 test

Thomas Huth
2019-09-25T16:37:29Z

A small test for the watchdog via diag288.

Minimum timer value is 15 (seconds) and the only supported action with
QEMU is restart.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20190827074631.7184-1-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
lib/s390x/asm/arch_def.h | 1 +
s390x/Makefile | 1 +
s390x/diag288.c | 114 +++++++++++++++++++++++++++++++++++++++
s390x/unittests.cfg | 4 ++
4 files changed, 120 insertions(+)
create mode 100644 s390x/diag288.c

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index d2cd727..4bbb428 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -15,6 +15,7 @@ struct psw {
uint64_t addr;
};

+#define PSW_MASK_EXT 0x0100000000000000UL
#define PSW_MASK_DAT 0x0400000000000000UL
#define PSW_MASK_PSTATE 0x0001000000000000UL

diff --git a/s390x/Makefile b/s390x/Makefile
index 574a9a2..3453373 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -12,6 +12,7 @@ tests += $(TEST_DIR)/vector.elf
tests += $(TEST_DIR)/gs.elf
tests += $(TEST_DIR)/iep.elf
tests += $(TEST_DIR)/cpumodel.elf
+tests += $(TEST_DIR)/diag288.elf
tests_binary = $(patsubst %.elf,%.bin,$(tests))

all: directories test_cases test_cases_binary
diff --git a/s390x/diag288.c b/s390x/diag288.c
new file mode 100644
index 0000000..b4934bf
--- /dev/null
+++ b/s390x/diag288.c
@@ -0,0 +1,114 @@
+/*
+ * Timer Event DIAG288 test
+ *
+ * Copyright (c) 2019 IBM Corp
+ *
+ * Authors:
+ * Janosch Frank <frankja@linux.ibm.com>
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License version 2.
+ */
+
+#include <libcflat.h>
+#include <asm/asm-offsets.h>
+#include <asm/interrupt.h>
+
+struct lowcore *lc = (struct lowcore *)0x0;
+
+#define CODE_INIT 0
+#define CODE_CHANGE 1
+#define CODE_CANCEL 2
+
+#define ACTION_RESTART 0
+
+static inline void diag288(unsigned long code, unsigned long time,
+ unsigned long action)
+{
+ register unsigned long fc asm("0") = code;
+ register unsigned long tm asm("1") = time;
+ register unsigned long ac asm("2") = action;
+
+ asm volatile("diag %0,%2,0x288"
+ : : "d" (fc), "d" (tm), "d" (ac));
+}
+
+static void test_specs(void)
+{
+ report_prefix_push("specification");
+
+ report_prefix_push("uneven");
+ expect_pgm_int();
+ asm volatile("diag 1,2,0x288");
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ report_prefix_pop();
+
+ report_prefix_push("unsupported action");
+ expect_pgm_int();
+ diag288(CODE_INIT, 15, 42);
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ report_prefix_pop();
+
+ report_prefix_push("unsupported function");
+ expect_pgm_int();
+ diag288(42, 15, ACTION_RESTART);
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ report_prefix_pop();
+
+ report_prefix_push("no init");
+ expect_pgm_int();
+ diag288(CODE_CANCEL, 15, ACTION_RESTART);
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ report_prefix_pop();
+
+ report_prefix_push("min timer");
+ expect_pgm_int();
+ diag288(CODE_INIT, 14, ACTION_RESTART);
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ report_prefix_pop();
+
+ report_prefix_pop();
+}
+
+static void test_priv(void)
+{
+ report_prefix_push("privileged");
+ expect_pgm_int();
+ enter_pstate();
+ diag288(CODE_INIT, 15, ACTION_RESTART);
+ check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+ report_prefix_pop();
+}
+
+static void test_bite(void)
+{
+ uint64_t mask, time;
+
+ /* If watchdog doesn't bite, the cpu timer does */
+ asm volatile("stck %0" : "=Q" (time) : : "cc");
+ time += (uint64_t)(16000 * 1000) << 12;
+ asm volatile("sckc %0" : : "Q" (time));
+ ctl_set_bit(0, 11);
+ mask = extract_psw_mask();
+ mask |= PSW_MASK_EXT;
+ load_psw_mask(mask);
+
+ /* Arm watchdog */
+ lc->restart_new_psw.mask = extract_psw_mask() & ~PSW_MASK_EXT;
+ diag288(CODE_INIT, 15, ACTION_RESTART);
+ asm volatile(" larl %r0, 1f\n"
+ " stg %r0, 424\n"
+ "0: nop\n"
+ " j 0b\n"
+ "1:");
+ report("restart", true);
+}
+
+int main(void)
+{
+ report_prefix_push("diag288");
+ test_priv();
+ test_specs();
+ test_bite();
+ return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index db58bad..9dd288a 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -64,3 +64,7 @@ file = iep.elf

[cpumodel]
file = cpumodel.elf
+
+[diag288]
+file = diag288.elf
+extra_params=-device diag288,id=watchdog0 --watchdog-action inject-nmi
--
2.18.1