Based upon the qtest reproducer posted to Gitlab issue #724 at
https://gitlab.com/qemu-project/qemu/-/issues/724.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 tests/qtest/am53c974-test.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tests/qtest/am53c974-test.c b/tests/qtest/am53c974-test.c
index 9b1e4211bd..d214a912b3 100644
--- a/tests/qtest/am53c974-test.c
+++ b/tests/qtest/am53c974-test.c
@@ -223,6 +223,34 @@ static void test_inflight_cancel_ok(void)
     qtest_quit(s);
 }
 
+static void test_reset_before_transfer_ok(void)
+{
+    QTestState *s = qtest_init(
+        "-device am53c974,id=scsi "
+        "-device scsi-hd,drive=disk0 -drive "
+        "id=disk0,if=none,file=null-co://,format=raw -nodefaults");
+
+    qtest_outl(s, 0xcf8, 0x80001010);
+    qtest_outl(s, 0xcfc, 0xc000);
+    qtest_outl(s, 0xcf8, 0x80001004);
+    qtest_outw(s, 0xcfc, 0x01);
+    qtest_outl(s, 0xc007, 0x2500);
+    qtest_outl(s, 0xc00a, 0x410000);
+    qtest_outl(s, 0xc00a, 0x410000);
+    qtest_outw(s, 0xc00b, 0x0200);
+    qtest_outw(s, 0xc040, 0x03);
+    qtest_outw(s, 0xc009, 0x00);
+    qtest_outw(s, 0xc00b, 0x00);
+    qtest_outw(s, 0xc009, 0x00);
+    qtest_outw(s, 0xc00b, 0x00);
+    qtest_outw(s, 0xc009, 0x00);
+    qtest_outw(s, 0xc003, 0x1000);
+    qtest_outw(s, 0xc00b, 0x1000);
+    qtest_outl(s, 0xc00b, 0x9000);
+    qtest_outw(s, 0xc00b, 0x1000);
+    qtest_quit(s);
+}
+
 int main(int argc, char **argv)
 {
     const char *arch = qtest_get_arch();
@@ -248,6 +276,8 @@ int main(int argc, char **argv)
                        test_cancelled_request_ok);
         qtest_add_func("am53c974/test_inflight_cancel_ok",
                        test_inflight_cancel_ok);
+        qtest_add_func("am53c974/test_reset_before_transfer_ok",
+                       test_reset_before_transfer_ok);
     }
 
     return g_test_run();
-- 
2.20.1

On 18/11/2021 11.03, Mark Cave-Ayland wrote:
> Based upon the qtest reproducer posted to Gitlab issue #724 at
> https://gitlab.com/qemu-project/qemu/-/issues/724.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>   tests/qtest/am53c974-test.c | 30 ++++++++++++++++++++++++++++++
>   1 file changed, 30 insertions(+)
> 
> diff --git a/tests/qtest/am53c974-test.c b/tests/qtest/am53c974-test.c
> index 9b1e4211bd..d214a912b3 100644
> --- a/tests/qtest/am53c974-test.c
> +++ b/tests/qtest/am53c974-test.c
> @@ -223,6 +223,34 @@ static void test_inflight_cancel_ok(void)
>       qtest_quit(s);
>   }
>   
> +static void test_reset_before_transfer_ok(void)
> +{
> +    QTestState *s = qtest_init(
> +        "-device am53c974,id=scsi "
> +        "-device scsi-hd,drive=disk0 -drive "
> +        "id=disk0,if=none,file=null-co://,format=raw -nodefaults");
> +
> +    qtest_outl(s, 0xcf8, 0x80001010);
> +    qtest_outl(s, 0xcfc, 0xc000);
> +    qtest_outl(s, 0xcf8, 0x80001004);
> +    qtest_outw(s, 0xcfc, 0x01);
> +    qtest_outl(s, 0xc007, 0x2500);
> +    qtest_outl(s, 0xc00a, 0x410000);
> +    qtest_outl(s, 0xc00a, 0x410000);
> +    qtest_outw(s, 0xc00b, 0x0200);
> +    qtest_outw(s, 0xc040, 0x03);
> +    qtest_outw(s, 0xc009, 0x00);
> +    qtest_outw(s, 0xc00b, 0x00);
> +    qtest_outw(s, 0xc009, 0x00);
> +    qtest_outw(s, 0xc00b, 0x00);
> +    qtest_outw(s, 0xc009, 0x00);
> +    qtest_outw(s, 0xc003, 0x1000);
> +    qtest_outw(s, 0xc00b, 0x1000);
> +    qtest_outl(s, 0xc00b, 0x9000);
> +    qtest_outw(s, 0xc00b, 0x1000);
> +    qtest_quit(s);
> +}
> +
>   int main(int argc, char **argv)
>   {
>       const char *arch = qtest_get_arch();
> @@ -248,6 +276,8 @@ int main(int argc, char **argv)
>                          test_cancelled_request_ok);
>           qtest_add_func("am53c974/test_inflight_cancel_ok",
>                          test_inflight_cancel_ok);
> +        qtest_add_func("am53c974/test_reset_before_transfer_ok",
> +                       test_reset_before_transfer_ok);
>       }
>   
>       return g_test_run();
> 

Acked-by: Thomas Huth <thuth@redhat.com>