From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:10474 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726455AbfLFQ0k (ORCPT ); Fri, 6 Dec 2019 11:26:40 -0500 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xB6GESEQ004829 for ; Fri, 6 Dec 2019 11:26:39 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2wq8ujnq6t-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 06 Dec 2019 11:26:39 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 6 Dec 2019 16:26:37 -0000 From: Pierre Morel Subject: [kvm-unit-tests PATCH v3 7/9] s390x: css: msch, enable test Date: Fri, 6 Dec 2019 17:26:26 +0100 In-Reply-To: <1575649588-6127-1-git-send-email-pmorel@linux.ibm.com> References: <1575649588-6127-1-git-send-email-pmorel@linux.ibm.com> Message-Id: <1575649588-6127-8-git-send-email-pmorel@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, frankja@linux.ibm.com, david@redhat.com, thuth@redhat.com, cohuck@redhat.com A second step when testing the channel subsystem is to prepare a channel for use. This includes: - Get the current SubCHannel Information Block (SCHIB) using STSCH - Update it in memory to set the ENABLE bit - Tell the CSS that the SCHIB has been modified using MSCH - Get the SCHIB from the CSS again to verify that the subchannel is enabled. This tests the success of the MSCH instruction by enabling a channel. Signed-off-by: Pierre Morel --- s390x/css.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/s390x/css.c b/s390x/css.c index 3d4a986..4c0031c 100644 --- a/s390x/css.c +++ b/s390x/css.c @@ -58,11 +58,50 @@ static void test_enumerate(void) report("Tested %d devices, %d found", 1, scn, found); } +static void test_enable(void) +{ + struct pmcw *pmcw = &schib.pmcw; + int cc; + + if (!test_device_sid) { + report_skip("No device"); + return; + } + /* Read the SCIB for this subchannel */ + cc = stsch(test_device_sid, &schib); + if (cc) { + report("stsch cc=%d", 0, cc); + return; + } + /* Update the SCHIB to enable the channel */ + pmcw->flags |= PMCW_ENABLE; + + /* Tell the CSS we want to modify the subchannel */ + cc = msch(test_device_sid, &schib); + if (cc) { + report("msch cc=%d", 0, cc); + return; + } + + /* Read the SCHIB again to verify the enablement */ + cc = stsch(test_device_sid, &schib); + if (cc) { + report("stsch cc=%d", 0, cc); + return; + } + if (!(pmcw->flags & PMCW_ENABLE)) { + report("Enable failed. pmcw: %x", 0, pmcw->flags); + return; + } + report("Tested", 1); +} + static struct { const char *name; void (*func)(void); } tests[] = { { "enumerate (stsch)", test_enumerate }, + { "enable (msch)", test_enable }, { NULL, NULL } }; -- 2.17.0