[kvm-unit-tests PATCH 2/7] s390x: css: add callback for emnumeration

[Pierre Morel <pmorel@xxxxxxxxxxxxx>]

We will need to look for a device inside the channel subsystem
based upon device specificities.

Let's provide a callback for an upper layer to be called during
the enumeration of the channel subsystem.

Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
 lib/s390x/css.h     | 3 ++-
 lib/s390x/css_lib.c | 4 +++-
 s390x/css.c         | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index d644971f..2005f4d7 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -278,7 +278,8 @@ void dump_irb(struct irb *irbp);
 void dump_pmcw(struct pmcw *p);
 void dump_orb(struct orb *op);
 
-int css_enumerate(void);
+typedef int (enumerate_cb_t)(int);
+int css_enumerate(enumerate_cb_t *f);
 #define MAX_ENABLE_RETRIES      5
 
 #define IO_SCH_ISC      3
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c
index efc70576..484f9c41 100644
--- a/lib/s390x/css_lib.c
+++ b/lib/s390x/css_lib.c
@@ -117,7 +117,7 @@ bool get_chsc_scsc(void)
  * On success return the first subchannel ID found.
  * On error return an invalid subchannel ID containing cc
  */
-int css_enumerate(void)
+int css_enumerate(enumerate_cb_t *f)
 {
 	struct pmcw *pmcw = &schib.pmcw;
 	int scn_found = 0;
@@ -153,6 +153,8 @@ int css_enumerate(void)
 			schid = scn | SCHID_ONE;
 		report_info("Found subchannel %08x", scn | SCHID_ONE);
 		dev_found++;
+		if (f)
+			f(scn | SCHID_ONE);
 	}
 
 out:
diff --git a/s390x/css.c b/s390x/css.c
index c340c539..b50fbc67 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -29,7 +29,7 @@ struct ccw1 *ccw;
 
 static void test_enumerate(void)
 {
-	test_device_sid = css_enumerate();
+	test_device_sid = css_enumerate(NULL);
 	if (test_device_sid & SCHID_ONE) {
 		report(1, "Schid of first I/O device: 0x%08x", test_device_sid);
 		return;
-- 
2.25.1