[kvm-unit-tests GIT PULL 7/9] s390x: css: testing measurement block format 1

[Janosch Frank <frankja@linux.ibm.com>]

From: Pierre Morel <pmorel@linux.ibm.com>

Measurement block format 1 is made available by the extended
measurement block facility and is indicated in the SCHIB by
the bit in the PMCW.

The MBO is specified in the SCHIB of each channel and the MBO
defined by the SCHM instruction is ignored.

The test of the MB format 1 is just skipped if the feature is
not available.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/kvm/1615545714-13747-7-git-send-email-pmorel@linux.ibm.com/
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 lib/s390x/css.h     | 15 +++++++++
 lib/s390x/css_lib.c |  2 +-
 s390x/css.c         | 75 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 335bc705..7e3d2613 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -107,6 +107,7 @@ struct schib {
 	uint64_t mbo;
 	uint8_t  md[4];
 } __attribute__ ((aligned(4)));
+extern struct schib schib;
 
 struct irb {
 	struct scsw scsw;
@@ -386,4 +387,18 @@ struct measurement_block_format0 {
 	uint32_t initial_cmd_resp_time;
 };
 
+struct measurement_block_format1 {
+	uint32_t ssch_rsch_count;
+	uint32_t sample_count;
+	uint32_t device_connect_time;
+	uint32_t function_pending_time;
+	uint32_t device_disconnect_time;
+	uint32_t cu_queuing_time;
+	uint32_t device_active_only_time;
+	uint32_t device_busy_time;
+	uint32_t initial_cmd_resp_time;
+	uint32_t irq_delay_time;
+	uint32_t irq_prio_delay_time;
+};
+
 #endif
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c
index 8f093839..efc70576 100644
--- a/lib/s390x/css_lib.c
+++ b/lib/s390x/css_lib.c
@@ -19,7 +19,7 @@
 #include <malloc_io.h>
 #include <css.h>
 
-static struct schib schib;
+struct schib schib;
 struct chsc_scsc *chsc_scsc;
 
 static const char * const chsc_rsp_description[] = {
diff --git a/s390x/css.c b/s390x/css.c
index 658c5f87..c340c539 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -257,6 +257,80 @@ static void test_schm_fmt0(void)
 	free_io_mem(mb0, shared_mb_size);
 }
 
+static void msch_with_wrong_fmt1_mbo(unsigned int schid, uint64_t mb)
+{
+	struct pmcw *pmcw = &schib.pmcw;
+	int cc;
+
+	/* Read the SCHIB for this subchannel */
+	cc = stsch(schid, &schib);
+	if (cc) {
+		report(0, "stsch: sch %08x failed with cc=%d", schid, cc);
+		return;
+	}
+
+	/* Update the SCHIB to enable the measurement block */
+	pmcw->flags |= PMCW_MBUE;
+	pmcw->flags2 |= PMCW_MBF1;
+	schib.mbo = mb;
+
+	/* Tell the CSS we want to modify the subchannel */
+	expect_pgm_int();
+	cc = msch(schid, &schib);
+	check_pgm_int_code(PGM_INT_CODE_OPERAND);
+}
+
+/*
+ * test_schm_fmt1:
+ * With measurement block format 1 the measurement block is
+ * dedicated to a subchannel.
+ */
+static void test_schm_fmt1(void)
+{
+	struct measurement_block_format1 *mb1;
+
+	if (!test_device_sid) {
+		report_skip("No device");
+		return;
+	}
+
+	if (!css_test_general_feature(CSSC_EXTENDED_MEASUREMENT_BLOCK)) {
+		report_skip("Extended measurement block not available");
+		return;
+	}
+
+	/* Allocate zeroed Measurement block */
+	mb1 = alloc_io_mem(sizeof(struct measurement_block_format1), 0);
+	if (!mb1) {
+		report_abort("measurement_block_format1 allocation failed");
+		return;
+	}
+
+	schm(NULL, 0); /* Stop any previous measurement */
+	schm(0, SCHM_MBU);
+
+	/* Expect error for non aligned MB */
+	report_prefix_push("Unaligned MB origin");
+	msch_with_wrong_fmt1_mbo(test_device_sid, (uint64_t)mb1 + 1);
+	report_prefix_pop();
+
+	/* Clear the measurement block for the next test */
+	memset(mb1, 0, sizeof(*mb1));
+
+	/* Expect success */
+	report_prefix_push("Valid MB origin");
+	if (start_measuring((u64)mb1, 0, true))
+		report(mb1->ssch_rsch_count == SCHM_UPDATE_CNT,
+		       "SSCH measured %d", mb1->ssch_rsch_count);
+	report_prefix_pop();
+
+	/* Stop the measurement */
+	css_disable_mb(test_device_sid);
+	schm(NULL, 0);
+
+	free_io_mem(mb1, sizeof(struct measurement_block_format1));
+}
+
 static struct {
 	const char *name;
 	void (*func)(void);
@@ -268,6 +342,7 @@ static struct {
 	{ "sense (ssch/tsch)", test_sense },
 	{ "measurement block (schm)", test_schm },
 	{ "measurement block format0", test_schm_fmt0 },
+	{ "measurement block format1", test_schm_fmt1 },
 	{ NULL, NULL }
 };
 
-- 
2.30.2