[kvm-unit-tests PATCH v3 6/9] s390x: css: stsch, enumeration test

[Pierre Morel <pmorel@xxxxxxxxxxxxx>]

First step for testing the channel subsystem is to enumerate the css and
retrieve the css devices.

This tests the success of STSCH I/O instruction.

Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
 lib/s390x/css.h     |  1 +
 s390x/Makefile      |  2 ++
 s390x/css.c         | 82 +++++++++++++++++++++++++++++++++++++++++++++
 s390x/unittests.cfg |  4 +++
 4 files changed, 89 insertions(+)
 create mode 100644 s390x/css.c

diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 6f19bb5..d37227b 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -82,6 +82,7 @@ struct pmcw {
 	uint8_t  chpid[8];
 	uint16_t flags2;
 };
+#define PMCW_CHANNEL_TYPE(pmcw) (pmcw->flags >> 21)
 
 struct schib {
 	struct pmcw pmcw;
diff --git a/s390x/Makefile b/s390x/Makefile
index 3744372..9ebbb84 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -16,6 +16,7 @@ tests += $(TEST_DIR)/diag288.elf
 tests += $(TEST_DIR)/stsi.elf
 tests += $(TEST_DIR)/skrf.elf
 tests += $(TEST_DIR)/smp.elf
+tests += $(TEST_DIR)/css.elf
 tests_binary = $(patsubst %.elf,%.bin,$(tests))
 
 all: directories test_cases test_cases_binary
@@ -50,6 +51,7 @@ cflatobjs += lib/s390x/sclp-console.o
 cflatobjs += lib/s390x/interrupt.o
 cflatobjs += lib/s390x/mmu.o
 cflatobjs += lib/s390x/smp.o
+cflatobjs += lib/s390x/css_dump.o
 
 OBJDIRS += lib/s390x
 
diff --git a/s390x/css.c b/s390x/css.c
new file mode 100644
index 0000000..3d4a986
--- /dev/null
+++ b/s390x/css.c
@@ -0,0 +1,82 @@
+/*
+ * Channel Subsystem tests
+ *
+ * Copyright (c) 2019 IBM Corp
+ *
+ * Authors:
+ *  Pierre Morel <pmorel@xxxxxxxxxxxxx>
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#include <libcflat.h>
+
+#include <css.h>
+
+#define SID_ONE		0x00010000
+
+static struct schib schib;
+
+static const char *Channel_type[4] = {
+	"I/O", "CHSC", "MSG", "EADM"
+};
+
+static int test_device_sid;
+
+static void test_enumerate(void)
+{
+	struct pmcw *pmcw = &schib.pmcw;
+	int scn;
+	int cc, i;
+	int found = 0;
+
+	for (scn = 0; scn < 0xffff; scn++) {
+		cc = stsch(scn|SID_ONE, &schib);
+		if (!cc && (pmcw->flags & PMCW_DNV)) {
+			report_info("SID %04x Type %s PIM %x", scn,
+				     Channel_type[PMCW_CHANNEL_TYPE(pmcw)],
+				     pmcw->pim);
+			for (i = 0; i < 8; i++)  {
+				if ((pmcw->pim << i) & 0x80) {
+					report_info("CHPID[%d]: %02x", i,
+						    pmcw->chpid[i]);
+					break;
+				}
+			}
+			found++;
+		}
+		if (cc == 3) /* cc = 3 means no more channel in CSS */
+			break;
+		if (found && !test_device_sid)
+			test_device_sid = scn|SID_ONE;
+	}
+	if (!found) {
+		report("Tested %d devices, none found", 0, scn);
+		return;
+	}
+	report("Tested %d devices, %d found", 1, scn, found);
+}
+
+static struct {
+	const char *name;
+	void (*func)(void);
+} tests[] = {
+	{ "enumerate (stsch)", test_enumerate },
+	{ NULL, NULL }
+};
+
+int main(int argc, char *argv[])
+{
+	int i;
+
+	report_prefix_push("Channel Sub-System");
+	for (i = 0; tests[i].name; i++) {
+		report_prefix_push(tests[i].name);
+		tests[i].func();
+		report_prefix_pop();
+	}
+	report_prefix_pop();
+
+	return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index f1b07cd..1755d9e 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -75,3 +75,7 @@ file = stsi.elf
 [smp]
 file = smp.elf
 extra_params =-smp 2
+
+[css]
+file = css.elf
+extra_params =-device ccw-pong
-- 
2.17.0