From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751951AbeCUCIu (ORCPT ); Tue, 20 Mar 2018 22:08:50 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40114 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751902AbeCUCIl (ORCPT ); Tue, 20 Mar 2018 22:08:41 -0400 From: Dong Jia Shi To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org Cc: cohuck@redhat.com, borntraeger@de.ibm.com, bjsdjshi@linux.vnet.ibm.com, pasic@linux.vnet.ibm.com, pmorel@linux.vnet.ibm.com Subject: [PATCH 4/4] vfio: ccw: add traceponits for interesting error paths Date: Wed, 21 Mar 2018 03:08:22 +0100 X-Mailer: git-send-email 2.13.5 In-Reply-To: <20180321020822.86255-1-bjsdjshi@linux.vnet.ibm.com> References: <20180321020822.86255-1-bjsdjshi@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18032102-0008-0000-0000-0000097C4BFC X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008713; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000254; SDB=6.01006058; UDB=6.00512229; IPR=6.00785341; MB=3.00020153; MTD=3.00000008; XFM=3.00000015; UTC=2018-03-21 02:08:39 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18032102-0009-0000-0000-000046795506 Message-Id: <20180321020822.86255-5-bjsdjshi@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2018-03-21_01:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1803210024 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Halil Pasic Add some tracepoints so we can inspect what is not working as is should. Signed-off-by: Halil Pasic Signed-off-by: Dong Jia Shi --- drivers/s390/cio/Makefile | 1 + drivers/s390/cio/vfio_ccw_fsm.c | 13 ++++++ drivers/s390/cio/vfio_ccw_trace.h | 86 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 drivers/s390/cio/vfio_ccw_trace.h diff --git a/drivers/s390/cio/Makefile b/drivers/s390/cio/Makefile index a070ef0efe65..f230516abb96 100644 --- a/drivers/s390/cio/Makefile +++ b/drivers/s390/cio/Makefile @@ -5,6 +5,7 @@ # The following is required for define_trace.h to find ./trace.h CFLAGS_trace.o := -I$(src) +CFLAGS_vfio_ccw_fsm.o := -I$(src) obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \ fcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c index c30420c517b1..7ed27f90d741 100644 --- a/drivers/s390/cio/vfio_ccw_fsm.c +++ b/drivers/s390/cio/vfio_ccw_fsm.c @@ -13,6 +13,9 @@ #include "ioasm.h" #include "vfio_ccw_private.h" +#define CREATE_TRACE_POINTS +#include "vfio_ccw_trace.h" + static int fsm_io_helper(struct vfio_ccw_private *private) { struct subchannel *sch; @@ -105,6 +108,10 @@ static void fsm_disabled_irq(struct vfio_ccw_private *private, */ cio_disable_subchannel(sch); } +inline struct subchannel_id get_schid(struct vfio_ccw_private *p) +{ + return p->sch->schid; +} /* * Deal with the ccw command request from the userspace. @@ -131,6 +138,8 @@ static void fsm_io_request(struct vfio_ccw_private *private, io_region->ret_code = cp_prefetch(&private->cp); if (io_region->ret_code) { + trace_vfio_ccw_cp_prefetch_failed(get_schid(private), + io_region->ret_code); cp_free(&private->cp); goto err_out; } @@ -138,6 +147,8 @@ static void fsm_io_request(struct vfio_ccw_private *private, /* Start channel program and wait for I/O interrupt. */ io_region->ret_code = fsm_io_helper(private); if (io_region->ret_code) { + trace_vfio_ccw_ssch_failed(get_schid(private), + io_region->ret_code); cp_free(&private->cp); goto err_out; } @@ -145,10 +156,12 @@ static void fsm_io_request(struct vfio_ccw_private *private, } else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) { /* XXX: Handle halt. */ io_region->ret_code = -EOPNOTSUPP; + trace_vfio_ccw_halt(get_schid(private)); goto err_out; } else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) { /* XXX: Handle clear. */ io_region->ret_code = -EOPNOTSUPP; + trace_vfio_ccw_clear(get_schid(private)); goto err_out; } diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h new file mode 100644 index 000000000000..edd3321cd919 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_trace.h @@ -0,0 +1,86 @@ +/* SPDX-License-Identifier: GPL-2.0 + * Tracepoints for vfio_ccw driver + * + * Copyright IBM Corp. 2018 + * + * Author(s): Dong Jia Shi + * Halil Pasic + */ + + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM vfio_ccw + +#if !defined(_VFIO_CCW_TRACE_) || defined(TRACE_HEADER_MULTI_READ) +#define _VFIO_CCW_TRACE_ + +#include + +TRACE_EVENT(vfio_ccw_cp_prefetch_failed, + TP_PROTO(struct subchannel_id schid, int errno), + TP_ARGS(schid, errno), + + TP_STRUCT__entry( + __field_struct(struct subchannel_id, schid) + __field(int, errno) + ), + + TP_fast_assign( + __entry->schid = schid; + __entry->errno = errno; + ), + + TP_printk("(schid 0.%x.%04X) translation failed (errno: %d)", + __entry->schid.ssid, __entry->schid.sch_no, __entry->errno) +); + +TRACE_EVENT(vfio_ccw_ssch_failed, + TP_PROTO(struct subchannel_id schid, int errno), + TP_ARGS(schid, errno), + + TP_STRUCT__entry( + __field_struct(struct subchannel_id, schid) + __field(int, errno) + ), + + TP_fast_assign( + __entry->schid = schid; + __entry->errno = errno; + ), + + TP_printk("(schid 0.%x.%04X) ssch failed (errno: %d)", + __entry->schid.ssid, __entry->schid.sch_no, __entry->errno) +); + +DECLARE_EVENT_CLASS(vfio_ccw_notsupp, + TP_PROTO(struct subchannel_id schid), + TP_ARGS(schid), + + TP_STRUCT__entry( + __field_struct(struct subchannel_id, schid) + ), + + TP_fast_assign( + __entry->schid = schid; + ), + + TP_printk("(schid 0.%x.%04X) request not supported", + __entry->schid.ssid, __entry->schid.sch_no) +); + +DEFINE_EVENT(vfio_ccw_notsupp, vfio_ccw_clear, + TP_PROTO(struct subchannel_id schid), TP_ARGS(schid)); + +DEFINE_EVENT(vfio_ccw_notsupp, vfio_ccw_halt, + TP_PROTO(struct subchannel_id schid), TP_ARGS(schid)); + +#endif /* _VFIO_CCW_TRACE_ */ + +/* This part must be outside protection */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE vfio_ccw_trace + +#include -- 2.13.5