[kvm-unit-tests,GIT,PULL,6/9] s390x: css: testing measurement block format 0

Commit Message

Janosch Frank May 5, 2021, 8:42 a.m. UTC

From: Pierre Morel <[e-mail]>

We test the update of the measurement block format 0, the
measurement block origin is calculated from the mbo argument
used by the SCHM instruction and the offset calculated using
the measurement block index of the SCHIB.

Signed-off-by: Pierre Morel <[e-mail]>
Reviewed-by: Cornelia Huck <[e-mail]>
Acked-by: Janosch Frank <[e-mail]>
Link: https://lore.kernel.org/kvm/[e-mail]/
Signed-off-by: Janosch Frank <[e-mail]>
---
 lib/s390x/css.h | 12 +++++++
 s390x/css.c     | 83 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)

Patch

diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 7158423c..335bc705 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -374,4 +374,16 @@  static inline void schm(void *mbo, unsigned int flags)
 bool css_enable_mb(int sid, uint64_t mb, uint16_t mbi, uint16_t flg, bool fmt1);
 bool css_disable_mb(int schid);
 
+struct measurement_block_format0 {
+	uint16_t ssch_rsch_count;
+	uint16_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;
+};
+
 #endif
diff --git a/s390x/css.c b/s390x/css.c
index af68266d..658c5f87 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -133,6 +133,13 @@  error_ccw:
 	free_io_mem(senseid, sizeof(*senseid));
 }
 
+static void sense_id(void)
+{
+	assert(!start_ccw1_chain(test_device_sid, ccw));
+
+	assert(wait_and_check_io_completion(test_device_sid) >= 0);
+}
+
 static void css_init(void)
 {
 	assert(register_io_int_func(css_irq_io) == 0);
@@ -175,6 +182,81 @@  static void test_schm(void)
 	report_prefix_pop();
 }
 
+#define SCHM_UPDATE_CNT 10
+static bool start_measuring(uint64_t mbo, uint16_t mbi, bool fmt1)
+{
+	int i;
+
+	senseid = alloc_io_mem(sizeof(*senseid), 0);
+	assert(senseid);
+
+	ccw = ccw_alloc(CCW_CMD_SENSE_ID, senseid, sizeof(*senseid), CCW_F_SLI);
+	assert(ccw);
+
+	if (!css_enable_mb(test_device_sid, mbo, mbi, PMCW_MBUE, fmt1)) {
+		report_abort("Enabling measurement block failed");
+		return false;
+	}
+
+	for (i = 0; i < SCHM_UPDATE_CNT; i++)
+		sense_id();
+
+	free_io_mem(ccw, sizeof(*ccw));
+	free_io_mem(senseid, sizeof(*senseid));
+
+	return true;
+}
+
+/*
+ * test_schm_fmt0:
+ * With measurement block format 0 a memory space is shared
+ * by all subchannels, each subchannel can provide an index
+ * for the measurement block facility to store the measurements.
+ */
+static void test_schm_fmt0(void)
+{
+	struct measurement_block_format0 *mb0;
+	int shared_mb_size = 2 * sizeof(struct measurement_block_format0);
+
+	if (!test_device_sid) {
+		report_skip("No device");
+		return;
+	}
+
+	/* Allocate zeroed Measurement block */
+	mb0 = alloc_io_mem(shared_mb_size, 0);
+	if (!mb0) {
+		report_abort("measurement_block_format0 allocation failed");
+		return;
+	}
+
+	schm(NULL, 0); /* Stop any previous measurement */
+	schm(mb0, SCHM_MBU);
+
+	/* Expect success */
+	report_prefix_push("Valid MB address and index 0");
+	report(start_measuring(0, 0, false) &&
+	       mb0->ssch_rsch_count == SCHM_UPDATE_CNT,
+	       "SSCH measured %d", mb0->ssch_rsch_count);
+	report_prefix_pop();
+
+	/* Clear the measurement block for the next test */
+	memset(mb0, 0, shared_mb_size);
+
+	/* Expect success */
+	report_prefix_push("Valid MB address and index 1");
+	if (start_measuring(0, 1, false))
+		report(mb0[1].ssch_rsch_count == SCHM_UPDATE_CNT,
+		       "SSCH measured %d", mb0[1].ssch_rsch_count);
+	report_prefix_pop();
+
+	/* Stop the measurement */
+	css_disable_mb(test_device_sid);
+	schm(NULL, 0);
+
+	free_io_mem(mb0, shared_mb_size);
+}
+
 static struct {
 	const char *name;
 	void (*func)(void);
@@ -185,6 +267,7 @@  static struct {
 	{ "enable (msch)", test_enable },
 	{ "sense (ssch/tsch)", test_sense },
 	{ "measurement block (schm)", test_schm },
+	{ "measurement block format0", test_schm_fmt0 },
 	{ NULL, NULL }
 };