On Fri, 24 Apr 2020 12:45:48 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
> First step for testing the channel subsystem is to enumerate the css and
> retrieve the css devices.
>
> This tests the success of STSCH I/O instruction, we do not test the
s/of/of the/
> reaction of the VM for an instruction with wrong parameters.
>
> Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
> ---
> lib/s390x/css.h | 1 +
> s390x/Makefile | 2 +
> s390x/css.c | 92 +++++++++++++++++++++++++++++++++++++++++++++
> s390x/unittests.cfg | 4 ++
> 4 files changed, 99 insertions(+)
> create mode 100644 s390x/css.c
>
(...)
> +static void test_enumerate(void)
> +{
> + struct pmcw *pmcw = &schib.pmcw;
> + int cc;
> + int scn;
> + int scn_found = 0;
> + int dev_found = 0;
> +
> + for (scn = 0; scn < 0xffff; scn++) {
> + cc = stsch(scn|SID_ONE, &schib);
> + switch (cc) {
> + case 0: /* 0 means SCHIB stored */
> + break;
> + case 3: /* 3 means no more channels */
> + goto out;
> + default: /* 1 or 2 should never happened for STSCH */
s/happened/happen/
> + report(0, "Unexpected cc=%d on subchannel number 0x%x",
> + cc, scn);
> + return;
> + }
