We check that the PTF instruction is working correctly when
the cpu topology facility is available.
For KVM only, we test changing of the polarity between horizontal
and vertical and that a reset set the horizontal polarity.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
s390x/Makefile | 1 +
s390x/topology.c | 190 ++++++++++++++++++++++++++++++++++++++++++++
s390x/unittests.cfg | 3 +
3 files changed, 194 insertions(+)
create mode 100644 s390x/topology.c
diff --git a/s390x/Makefile b/s390x/Makefile
index a80db53..fe77b07 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -40,6 +40,7 @@ tests += $(TEST_DIR)/panic-loop-pgm.elf
tests += $(TEST_DIR)/migration-sck.elf
tests += $(TEST_DIR)/exittime.elf
tests += $(TEST_DIR)/ex.elf
+tests += $(TEST_DIR)/topology.elf
pv-tests += $(TEST_DIR)/pv-diags.elf
diff --git a/s390x/topology.c b/s390x/topology.c
new file mode 100644
index 0000000..7e1bbf9
--- /dev/null
+++ b/s390x/topology.c
@@ -0,0 +1,190 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * CPU Topology
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Authors:
+ * Pierre Morel <pmorel@xxxxxxxxxxxxx>
+ */
+
+#include <libcflat.h>
+#include <asm/page.h>
+#include <asm/asm-offsets.h>
+#include <asm/interrupt.h>
+#include <asm/facility.h>
+#include <asm/barrier.h>
+#include <smp.h>
+#include <sclp.h>
+#include <s390x/hardware.h>
+
+#define PTF_REQ_HORIZONTAL 0
+#define PTF_REQ_VERTICAL 1
+#define PTF_CHECK 2
+
+#define PTF_ERR_NO_REASON 0
+#define PTF_ERR_ALRDY_POLARIZED 1
+#define PTF_ERR_IN_PROGRESS 2
+
+extern int diag308_load_reset(u64);
+
+static int ptf(unsigned long fc, unsigned long *rc)
+{
+ int cc;
+
+ asm volatile(
+ " ptf %1 \n"
+ " ipm %0 \n"
+ " srl %0,28 \n"
+ : "=d" (cc), "+d" (fc)
+ :
+ : "cc");
+
+ *rc = fc >> 8;
+ return cc;
+}
+
+static void check_privilege(int fc)
+{
+ unsigned long rc;
+ char buf[20];
+
+ snprintf(buf, sizeof(buf), "Privileged fc %d", fc);
+ report_prefix_push(buf);
+ enter_pstate();
+ expect_pgm_int();
+ ptf(fc, &rc);
+ check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+ report_prefix_pop();
+}
+
+static void check_specifications(void)
+{
+ unsigned long error = 0;
+ unsigned long ptf_bits;
+ unsigned long rc;
+ int i;
+
+ report_prefix_push("Specifications");
+
+ /* Function codes above 3 are undefined */
+ for (i = 4; i < 255; i++) {
+ expect_pgm_int();
+ ptf(i, &rc);
+ if (clear_pgm_int() != PGM_INT_CODE_SPECIFICATION) {
+ report_fail("FC %d did not yield specification exception", i);
+ error = 1;
+ }
+ }
+ report(!error, "Undefined function codes");
+
+ /* Reserved bits must be 0 */
+ for (i = 8, error = 0; i < 64; i++) {
+ ptf_bits = 0x01UL << i;
+ expect_pgm_int();
+ ptf(ptf_bits, &rc);
+ if (clear_pgm_int() != PGM_INT_CODE_SPECIFICATION) {
+ report_fail("Reserved bit %d did not yield specification exception", i);
+ error = 1;
+ }
+ }
+
+ report(!error, "Reserved bits");
+
+ report_prefix_pop();
+}
+
+static void check_polarization_change(void)
+{
+ unsigned long rc;
+ int cc;
+
+ report_prefix_push("Polarization change");
+
+ /* We expect a clean state through reset */
+ report(diag308_load_reset(1), "load normal reset done");
+
+ /*
+ * Set vertical polarization to verify that RESET sets
+ * horizontal polarization back.
+ */
+ cc = ptf(PTF_REQ_VERTICAL, &rc);
+ report(cc == 0, "Set vertical polarization.");
+
+ report(diag308_load_reset(1), "load normal reset done");
+
+ cc = ptf(PTF_CHECK, &rc);
+ report(cc == 0, "Reset should clear topology report");
+
+ cc = ptf(PTF_REQ_HORIZONTAL, &rc);
+ report(cc == 2 && rc == PTF_ERR_ALRDY_POLARIZED,
+ "After RESET polarization is horizontal");
+
+ /* Flip between vertical and horizontal polarization */
+ cc = ptf(PTF_REQ_VERTICAL, &rc);
+ report(cc == 0, "Change to vertical");
+
+ cc = ptf(PTF_CHECK, &rc);
+ report(cc == 1, "Should report");
+
+ cc = ptf(PTF_REQ_VERTICAL, &rc);
+ report(cc == 2 && rc == PTF_ERR_ALRDY_POLARIZED, "Double change to vertical");
+
+ cc = ptf(PTF_CHECK, &rc);
+ report(cc == 0, "Should not report");
+
+ cc = ptf(PTF_REQ_HORIZONTAL, &rc);
+ report(cc == 0, "Change to horizontal");
+
+ cc = ptf(PTF_CHECK, &rc);
+ report(cc == 1, "Should Report");
+
+ cc = ptf(PTF_REQ_HORIZONTAL, &rc);
+ report(cc == 2 && rc == PTF_ERR_ALRDY_POLARIZED, "Double change to horizontal");
+
+ cc = ptf(PTF_CHECK, &rc);
+ report(cc == 0, "Should not report");
+
+ report_prefix_pop();
+}
+
+static void test_ptf(void)
+{
+ check_privilege(PTF_REQ_HORIZONTAL);
+ check_privilege(PTF_REQ_VERTICAL);
+ check_privilege(PTF_CHECK);
+ check_specifications();
+ check_polarization_change();
+}
+
+static struct {
+ const char *name;
+ void (*func)(void);
+} tests[] = {
+ { "PTF", test_ptf },
+ { NULL, NULL }
+};
+
+int main(int argc, char *argv[])
+{
+ int i;
+
+ report_prefix_push("CPU Topology");
+
+ if (!test_facility(11)) {
+ report_skip("Topology facility not present");
+ goto end;
+ }
+
+ report_info("Virtual machine level %ld", stsi_get_fc());
+
+ for (i = 0; tests[i].name; i++) {
+ report_prefix_push(tests[i].name);
+ tests[i].func();
+ report_prefix_pop();
+ }
+
+end:
+ report_prefix_pop();
+ return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index b61faf0..fc3666b 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -218,3 +218,6 @@ extra_params = -append '--parallel'
[execute]
file = ex.elf
+
+[topology]
+file = topology.elf
--
2.31.1
