From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:12284 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732885AbfLKPqU (ORCPT ); Wed, 11 Dec 2019 10:46:20 -0500 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xBBFhQU0043092 for ; Wed, 11 Dec 2019 10:46:19 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0b-001b2d01.pphosted.com with ESMTP id 2wsqc2fdhc-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 11 Dec 2019 10:46:18 -0500 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 11 Dec 2019 15:46:17 -0000 From: Pierre Morel Subject: [kvm-unit-tests PATCH v4 7/9] s390x: css: msch, enable test Date: Wed, 11 Dec 2019 16:46:08 +0100 In-Reply-To: <1576079170-7244-1-git-send-email-pmorel@linux.ibm.com> References: <1576079170-7244-1-git-send-email-pmorel@linux.ibm.com> Message-Id: <1576079170-7244-8-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 | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/s390x/css.c b/s390x/css.c index dfab35f..b8824ad 100644 --- a/s390x/css.c +++ b/s390x/css.c @@ -19,12 +19,24 @@ #include #include +#include #define SID_ONE 0x00010000 static struct schib schib; static int test_device_sid; +static inline void delay(unsigned long ms) +{ + unsigned long startclk; + + startclk = get_clock_ms(); + for (;;) { + if (get_clock_ms() - startclk > ms) + break; + } +} + static void test_enumerate(void) { struct pmcw *pmcw = &schib.pmcw; @@ -64,11 +76,64 @@ out: report(1, "Devices, tested: %d, I/O type: %d", scn, scn_found); } +static void test_enable(void) +{ + struct pmcw *pmcw = &schib.pmcw; + int count = 0; + int cc; + + if (!test_device_sid) { + report_skip("No device"); + return; + } + /* Read the SCHIB for this subchannel */ + cc = stsch(test_device_sid, &schib); + if (cc) { + report(0, "stsch cc=%d", 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) { + /* + * If the subchannel is status pending or + * if a function is in progress, + * we consider both cases as errors. + */ + report(0, "msch cc=%d", cc); + return; + } + + /* + * Read the SCHIB again to verify the enablement + * insert a little delay and try 5 times. + */ + do { + cc = stsch(test_device_sid, &schib); + if (cc) { + report(0, "stsch cc=%d", cc); + return; + } + delay(10); + } while (!(pmcw->flags & PMCW_ENABLE) && count++ < 5); + + if (!(pmcw->flags & PMCW_ENABLE)) { + report(0, "Enable failed. pmcw: %x", pmcw->flags); + return; + } + report(1, "Tested"); +} + static struct { const char *name; void (*func)(void); } tests[] = { { "enumerate (stsch)", test_enumerate }, + { "enable (msch)", test_enable }, { NULL, NULL } }; -- 2.17.0