From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752535AbXGQMVH (ORCPT ); Tue, 17 Jul 2007 08:21:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758898AbXGQMUI (ORCPT ); Tue, 17 Jul 2007 08:20:08 -0400 Received: from mtagate4.de.ibm.com ([195.212.29.153]:21097 "EHLO mtagate4.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753271AbXGQMUF (ORCPT ); Tue, 17 Jul 2007 08:20:05 -0400 Message-Id: <20070717122239.461337642@de.ibm.com> References: <20070717121747.591687140@de.ibm.com> User-Agent: quilt/0.46-1 Date: Tue, 17 Jul 2007 14:17:50 +0200 From: Martin Schwidefsky To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Frank Pavlic , Martin Schwidefsky Subject: [patch 3/8] qdio: output queue stall on FCP and network devices Content-Disposition: inline; filename=002-qdio-stall.diff Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Frank Pavlic When running QIOASSIST enabled qdio devices in a z/VM environment the output queue for such devices stall in heavy workload situations. When SQBS and EQBS instructions returns CCQ=96 qdio does not reissue the instruction again with the register settings done by millicode but processed the returned qdio buffer. This is wrong. qdio has to reissue the instruction once again on CCQ=96, as we already do it for CCQ=97. Signed-off-by: Frank Pavlic Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/qdio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: quilt-2.6/drivers/s390/cio/qdio.c =================================================================== --- quilt-2.6.orig/drivers/s390/cio/qdio.c +++ quilt-2.6/drivers/s390/cio/qdio.c @@ -166,9 +166,9 @@ qdio_check_ccq(struct qdio_q *q, unsigne { char dbf_text[15]; - if (ccq == 0 || ccq == 32 || ccq == 96) + if (ccq == 0 || ccq == 32) return 0; - if (ccq == 97) + if (ccq == 96 || ccq == 97) return 1; /*notify devices immediately*/ sprintf(dbf_text,"%d", ccq); -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.