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);
