[kvm-unit-tests PATCH v3 15/16] s390x: css: testing halt subchannel

[Pierre Morel <pmorel@linux.ibm.com>]

checking return values for HSCH for various configurations.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
 lib/s390x/css.h     |  4 +++
 lib/s390x/css_lib.c |  4 +++
 s390x/css.c         | 63 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 3eb6957..90c8e4b 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -92,6 +92,10 @@ struct scsw {
 #define SCSW_KEY		0xf0000000
 #define SCSW_SSCH_COMPLETED	(SCSW_CCW_FORMAT | SCSW_FC_START | SCSW_SC_PENDING | SCSW_SC_SECONDARY | \
 				 SCSW_SC_PRIMARY)
+#define SCSW_HSCH_COMPLETED	(SCSW_CCW_FORMAT | SCSW_FC_HALT | \
+				 SCSW_SC_PENDING)
+#define SCSW_CSCH_COMPLETED	(SCSW_CCW_FORMAT | SCSW_FC_CLEAR | \
+				 SCSW_SC_PENDING)
 	uint32_t ctrl;
 	uint32_t ccw_addr;
 #define SCSW_DEVS_DEV_END	0x04
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c
index 12ef874..4c4506a 100644
--- a/lib/s390x/css_lib.c
+++ b/lib/s390x/css_lib.c
@@ -528,6 +528,10 @@ int check_io_completion(int schid, uint32_t ctrl)
 		goto end;
 	}
 
+	/* We do not need more check for HSCH or CSCH */
+	if (irb.scsw.ctrl & (SCSW_FC_HALT | SCSW_FC_CLEAR))
+		goto end;
+
 	if (!(irb.scsw.ctrl & (SCSW_SC_SECONDARY | SCSW_SC_PRIMARY))) {
 		report(0, "Primary or secondary status missing. Subch Ctrl: %08x",
 		       irb.scsw.ctrl);
diff --git a/s390x/css.c b/s390x/css.c
index 52264f2..0f80a44 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -300,6 +300,68 @@ static void test_ssch(void)
 	css_enable(test_device_sid, 0);
 }
 
+static void test_hsch(void)
+{
+	struct orb orb = {
+		.intparm = test_device_sid,
+		.ctrl = ORB_CTRL_ISIC | ORB_CTRL_FMT | ORB_LPM_DFLT,
+	};
+	struct ccw1 *ccw;
+
+	senseid = alloc_io_mem(sizeof(*senseid), 0);
+	assert(senseid);
+	ccw = ccw_alloc(CCW_CMD_SENSE_ID, senseid, sizeof(*senseid), CCW_F_SLI);
+	assert(ccw);
+	orb.cpa = (uint64_t)ccw;
+
+	/* HSCH is a privilege operation */
+	report_prefix_push("Privilege");
+	enter_pstate();
+	expect_pgm_int();
+	hsch(test_device_sid);
+	check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+	report_prefix_pop();
+
+	/* Basic HSCH */
+	report_prefix_push("HSCH on a quiet subchannel");
+	assert(css_enable(test_device_sid, 0) == 0);
+	report(hsch(test_device_sid) == 0, "subchannel halted");
+	report_prefix_pop();
+
+	/* now we check the flags */
+	report_prefix_push("Ctrl flags");
+	assert(tsch(test_device_sid, &irb) == 0);
+	report(check_io_completion(test_device_sid, SCSW_HSCH_COMPLETED) == 0, "expected");
+	report_prefix_pop();
+
+	/* Check HSCH after SSCH */
+	report_prefix_push("HSCH on status pending subchannel");
+	assert(ssch(test_device_sid, &orb) == 0);
+	report(hsch(test_device_sid) == 1, "Halt subchannel should fail with CC 1");
+	assert(tsch(test_device_sid, &irb) == 0);
+	check_io_completion(test_device_sid, SCSW_SSCH_COMPLETED);
+	report_prefix_pop();
+
+	/* Check HSCH after CSCH */
+	report_prefix_push("HSCH on busy on CSCH subchannel");
+	assert(csch(test_device_sid) == 0);
+	report(hsch(test_device_sid) == 1, "Halt subchannel should fail with CC 1");
+	assert(tsch(test_device_sid, &irb) == 0);
+	check_io_completion(test_device_sid, SCSW_CSCH_COMPLETED);
+	report_prefix_pop();
+
+	/* Check HSCH after HSCH */
+	report_prefix_push("HSCH on busy on HSCH subchannel");
+	assert(hsch(test_device_sid) == 0);
+	report(hsch(test_device_sid) == 1, "Halt subchannel should fail with CC 1");
+	assert(tsch(test_device_sid, &irb) == 0);
+	check_io_completion(test_device_sid, SCSW_HSCH_COMPLETED);
+	report_prefix_pop();
+
+	free_io_mem(senseid, sizeof(*senseid));
+	free_io_mem(ccw, sizeof(*ccw));
+}
+
 /*
  * test_sense
  * Pre-requisites:
@@ -569,6 +631,7 @@ static struct tests tests[] = {
 	/* The css_init test is needed to initialize the CSS Characteristics */
 	{ "enable (msch)", test_enable },
 	{ "start subchannel", test_ssch },
+	{ "halt subchannel", test_hsch },
 	{ "sense (ssch/tsch)", test_sense },
 	{ "measurement block (schm)", test_schm },
 	{ "measurement block format0", test_schm_fmt0 },
-- 
2.17.1