From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:39638 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726280AbgFQItJ (ORCPT ); Wed, 17 Jun 2020 04:49:09 -0400 Date: Wed, 17 Jun 2020 10:48:57 +0200 From: Cornelia Huck Subject: Re: [kvm-unit-tests PATCH v9 10/12] s390x: css: stsch, enumeration test Message-ID: <20200617104857.1bdab6a5.cohuck@redhat.com> In-Reply-To: <1592213521-19390-11-git-send-email-pmorel@linux.ibm.com> References: <1592213521-19390-1-git-send-email-pmorel@linux.ibm.com> <1592213521-19390-11-git-send-email-pmorel@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Pierre Morel Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, frankja@linux.ibm.com, david@redhat.com, thuth@redhat.com On Mon, 15 Jun 2020 11:31:59 +0200 Pierre Morel wrote: > First step for testing the channel subsystem is to enumerate the css and > retrieve the css devices. Maybe worth adding a note: "We currently don't enable multiple subchannel sets and therefore only look in subchannel set 0." > > This tests the success of STSCH I/O instruction, we do not test the > reaction of the VM for an instruction with wrong parameters. > > Signed-off-by: Pierre Morel > --- > lib/s390x/css_lib.c | 70 +++++++++++++++++++++++++++++++++++++++++++++ > s390x/Makefile | 2 ++ > s390x/css.c | 55 +++++++++++++++++++++++++++++++++++ > s390x/unittests.cfg | 4 +++ > 4 files changed, 131 insertions(+) > create mode 100644 lib/s390x/css_lib.c > create mode 100644 s390x/css.c > > diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c > new file mode 100644 > index 0000000..b0a0294 > --- /dev/null > +++ b/lib/s390x/css_lib.c > @@ -0,0 +1,70 @@ > +/* > + * Channel Subsystem tests library > + * > + * Copyright (c) 2020 IBM Corp > + * > + * Authors: > + * Pierre Morel > + * > + * This code is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2. > + */ > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > + > +static struct schib schib; > + > +/* > + * css_enumerate: > + * On success return the first subchannel ID found. > + * On error return an invalid subchannel ID containing cc > + */ > +int css_enumerate(void) > +{ > + struct pmcw *pmcw = &schib.pmcw; > + int scn_found = 0; > + int dev_found = 0; > + int schid = 0; > + int cc; > + int scn; > + > + for (scn = 0; scn < 0xffff; scn++) { > + cc = stsch(scn | SCHID_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_abort("Unexpected error %d on subchannel %08x", > + cc, scn | SCHID_ONE); > + return cc; > + } > + > + /* We currently only support type 0, a.k.a. I/O channels */ > + if (PMCW_CHANNEL_TYPE(pmcw) != 0) > + continue; > + > + /* We ignore I/O channels without valid devices */ > + scn_found++; > + if (!(pmcw->flags & PMCW_DNV)) > + continue; > + > + /* We keep track of the first device as our test device */ > + if (!schid) > + schid = scn | SCHID_ONE; > + report_info("Found subchannel %08x", scn | SCHID_ONE); > + dev_found++; > + } > + > +out: > + report_info("Tested subchannels: %d, I/O subchannels: %d, I/O devices: %d", > + scn, scn_found, dev_found); > + return schid; > +} (...) > diff --git a/s390x/css.c b/s390x/css.c > new file mode 100644 > index 0000000..230adf5 > --- /dev/null > +++ b/s390x/css.c > @@ -0,0 +1,55 @@ > +/* > + * Channel Subsystem tests > + * > + * Copyright (c) 2020 IBM Corp > + * > + * Authors: > + * Pierre Morel > + * > + * This code is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > + > +static int test_device_sid; > + > +static void test_enumerate(void) > +{ > + test_device_sid = css_enumerate(); > + if (test_device_sid & SCHID_ONE) { > + report(1, "First device schid: 0x%08x", test_device_sid); Maybe "Schid of first I/O device" ? > + return; > + } > + report(0, "No I/O device found"); > +} > + > +static struct { > + const char *name; > + void (*func)(void); > +} tests[] = { > + { "enumerate (stsch)", test_enumerate }, > + { NULL, NULL } > +}; > + > +int main(int argc, char *argv[]) > +{ > + int i; > + > + report_prefix_push("Channel Subsystem"); > + for (i = 0; tests[i].name; i++) { > + report_prefix_push(tests[i].name); > + tests[i].func(); > + report_prefix_pop(); > + } > + report_prefix_pop(); > + > + return report_summary(); > +} Reviewed-by: Cornelia Huck