From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06A2EC433E0 for ; Wed, 17 Jun 2020 08:54:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C61FA21527 for ; Wed, 17 Jun 2020 08:54:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="U1E32HYw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725846AbgFQIyr (ORCPT ); Wed, 17 Jun 2020 04:54:47 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:24355 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725901AbgFQIyr (ORCPT ); Wed, 17 Jun 2020 04:54:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592384085; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OyBmfaQpnotnRsL5tWB9CmbAwI11duXRS+HA1U897D0=; b=U1E32HYw1L3ZWYckby0O8vtfAbk9Lm7Xgn6h0mTWeV7qcwmVbgdrfO5L1JFY+9ernlR63T 8TzNG9cNzeu2Ev0qxj0pQfvecpYNkVvPRBcVLugm2Nt2mayVXYIIP3zvh4VFyfQZZzFQ7B LCcsY8fmoxETa2ArArPapifET0f9vIE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-310-IALioR1mPViDYoJIBrw-UQ-1; Wed, 17 Jun 2020 04:54:41 -0400 X-MC-Unique: IALioR1mPViDYoJIBrw-UQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8F1EB18A8227; Wed, 17 Jun 2020 08:54:40 +0000 (UTC) Received: from gondolin (ovpn-112-222.ams2.redhat.com [10.36.112.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id 96E097CAA5; Wed, 17 Jun 2020 08:54:36 +0000 (UTC) Date: Wed, 17 Jun 2020 10:54:33 +0200 From: Cornelia Huck To: Pierre Morel Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, frankja@linux.ibm.com, david@redhat.com, thuth@redhat.com Subject: Re: [kvm-unit-tests PATCH v9 11/12] s390x: css: msch, enable test Message-ID: <20200617105433.6a79e92c.cohuck@redhat.com> In-Reply-To: <1592213521-19390-12-git-send-email-pmorel@linux.ibm.com> References: <1592213521-19390-1-git-send-email-pmorel@linux.ibm.com> <1592213521-19390-12-git-send-email-pmorel@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, 15 Jun 2020 11:32:00 +0200 Pierre Morel wrote: > 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. > - If the command succeeds but subchannel is not enabled retry a > predefined retries count. > - If the command fails, report the failure and do not retry, even > if cc indicates a busy/status pending as we do not expect this. > > This tests the MSCH instruction to enable a channel succesfuly. > This some retries are done and in case of error, and if the retries > count is exceeded, a report is made. > > Signed-off-by: Pierre Morel > --- > lib/s390x/css_lib.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ > s390x/css.c | 15 ++++++++++++ > 2 files changed, 75 insertions(+) > > diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c > index b0a0294..06a76db 100644 > --- a/lib/s390x/css_lib.c > +++ b/lib/s390x/css_lib.c > @@ -15,6 +15,7 @@ > #include > #include > #include > +#include > > #include > > @@ -68,3 +69,62 @@ out: > scn, scn_found, dev_found); > return schid; > } > + > +int css_enable(int schid) > +{ > + struct pmcw *pmcw = &schib.pmcw; > + int retry_count = 0; > + int cc; > + > + /* Read the SCHIB for this subchannel */ > + cc = stsch(schid, &schib); > + if (cc) { > + report_info("stsch failed with cc=%d", cc); Mention the schid in the message? > + return cc; > + } > + > + if (pmcw->flags & PMCW_ENABLE) { > + report_info("stsch: sch %08x already enabled", schid); > + return 0; > + } > + > +retry: > + /* Update the SCHIB to enable the channel */ > + pmcw->flags |= PMCW_ENABLE; > + > + /* Tell the CSS we want to modify the subchannel */ > + cc = msch(schid, &schib); > + if (cc) { > + /* > + * If the subchannel is status pending or > + * if a function is in progress, > + * we consider both cases as errors. > + */ > + report_info("msch failed with cc=%d", cc); > + return cc; > + } > + > + /* > + * Read the SCHIB again to verify the enablement > + */ > + cc = stsch(schid, &schib); > + if (cc) { > + report_info("stsch failed with cc=%d", cc); Also add the schid here? Maybe also add a marker to distinguish the two cases? > + return cc; > + } > + > + if (pmcw->flags & PMCW_ENABLE) { > + report_info("Subchannel %08x enabled after %d retries", > + schid, retry_count); > + return 0; > + } > + > + if (retry_count++ < MAX_ENABLE_RETRIES) { > + mdelay(10); /* the hardware was not ready, give it some time */ > + goto retry; > + } > + > + report_info("msch: enabling sch %08x failed after %d retries. pmcw flags: %x", > + schid, retry_count, pmcw->flags); > + return -1; > +} With the messages updated, Reviewed-by: Cornelia Huck