tests/gem_seqno_wrap: verify debugfs write with readback

Make sure that debugfs entry works as expected by reading
back the sequence number that was written.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/tests/gem_seqno_wrap.c b/tests/gem_seqno_wrap.c
index 43e3851..776dedc 100644 (file)
--- a/tests/gem_seqno_wrap.c
+++ b/tests/gem_seqno_wrap.c
@@ -438,6 +438,7 @@ static int write_seqno(uint32_t seqno)
        int fh;
        char buf[32];
        int r;
+       uint32_t rb;
 
        if (options.dontwrap)
                return 0;
@@ -457,6 +458,15 @@ static int write_seqno(uint32_t seqno)
        if (options.verbose)
                printf("next_seqno set to: 0x%x\n", seqno);
 
+       r = __read_seqno(&rb);
+       if (r < 0)
+               return r;
+
+       if (rb != seqno) {
+               printf("seqno readback differs rb:0x%x vs w:0x%x\n", rb, seqno);
+               return -1;
+       }
+
        return 0;
 }