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

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On 2019-12-09 12:52, Thomas Huth wrote:
On 06/12/2019 17.26, Pierre Morel wrote:
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);

I'm sorry, but since last Friday, you now have to swap the first two
parameters of the report() function. (that was unfortunately necessary
to fix an issue with Clang)

  Thomas


grrr.   :)

OK, will do.

Thanks,
Pierre

--
Pierre Morel
IBM Lab Boeblingen




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