From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:60532 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727080AbfJOJyW (ORCPT ); Tue, 15 Oct 2019 05:54:22 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x9F9lojf056486 for ; Tue, 15 Oct 2019 05:54:21 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2vnastjhab-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 15 Oct 2019 05:54:20 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 15 Oct 2019 10:54:18 +0100 Subject: Re: [RFC PATCH 3/4] vfio-ccw: Add a trace for asynchronous requests References: <20191014180855.19400-1-farman@linux.ibm.com> <20191014180855.19400-4-farman@linux.ibm.com> From: Steffen Maier Date: Tue, 15 Oct 2019 11:54:13 +0200 MIME-Version: 1.0 In-Reply-To: <20191014180855.19400-4-farman@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Message-Id: <2fd50890-2d94-37ae-8266-1b41b9bf9a74@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Eric Farman , Cornelia Huck , Halil Pasic Cc: Jason Herne , Jared Rossi , linux-s390@vger.kernel.org, kvm@vger.kernel.org On 10/14/19 8:08 PM, Eric Farman wrote: > Since the asynchronous requests are typically associated with > error recovery, let's add a simple trace when one of those is > issued to a device. > > Signed-off-by: Eric Farman > --- > drivers/s390/cio/vfio_ccw_fsm.c | 4 ++++ > drivers/s390/cio/vfio_ccw_trace.c | 1 + > drivers/s390/cio/vfio_ccw_trace.h | 26 ++++++++++++++++++++++++++ > 3 files changed, 31 insertions(+) > > diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c > index d4119e4c4a8c..23648a9aa721 100644 > --- a/drivers/s390/cio/vfio_ccw_fsm.c > +++ b/drivers/s390/cio/vfio_ccw_fsm.c > @@ -341,6 +341,10 @@ static void fsm_async_request(struct vfio_ccw_private *private, > /* should not happen? */ > cmd_region->ret_code = -EINVAL; > } > + > + trace_vfio_ccw_fsm_async_request(get_schid(private), > + cmd_region->command, > + cmd_region->ret_code); > } > > /* > diff --git a/drivers/s390/cio/vfio_ccw_trace.c b/drivers/s390/cio/vfio_ccw_trace.c > index b37bc68e7f18..37ecbf8be805 100644 > --- a/drivers/s390/cio/vfio_ccw_trace.c > +++ b/drivers/s390/cio/vfio_ccw_trace.c > @@ -9,5 +9,6 @@ > #define CREATE_TRACE_POINTS > #include "vfio_ccw_trace.h" > > +EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_async_request); > EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_fsm_event); > EXPORT_TRACEPOINT_SYMBOL(vfio_ccw_io_fctl); > diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h > index 24a8152acfdf..4be2e36242e6 100644 > --- a/drivers/s390/cio/vfio_ccw_trace.h > +++ b/drivers/s390/cio/vfio_ccw_trace.h > @@ -17,6 +17,32 @@ > > #include > > +TRACE_EVENT(vfio_ccw_fsm_async_request, > + TP_PROTO(struct subchannel_id schid, > + int command, > + int errno), > + TP_ARGS(schid, command, errno), > + > + TP_STRUCT__entry( > + __field_struct(struct subchannel_id, schid) Not sure: Does this allow the user to filter for fields of struct subchannel_id or can the user express a filter on the entire combined struct subchannel_id? In the preceding patch you have the 3 parts of schid as explicit separate trace fields in the tracepoint. > + __field(int, command) > + __field(int, errno) > + ), > + > + TP_fast_assign( > + __entry->schid = schid; > + __entry->command = command; > + __entry->errno = errno; > + ), > + > + TP_printk("schid=%x.%x.%04x command=%d errno=%d", > + __entry->schid.cssid, > + __entry->schid.ssid, > + __entry->schid.sch_no, > + __entry->command, > + __entry->errno) > +); > + > TRACE_EVENT(vfio_ccw_fsm_event, > TP_PROTO(struct subchannel_id schid, int state, int event), > TP_ARGS(schid, state, event), > -- Mit freundlichen Gruessen / Kind regards Steffen Maier Linux on IBM Z Development https://www.ibm.com/privacy/us/en/ IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Matthias Hartmann Geschaeftsfuehrung: Dirk Wittkopp Sitz der Gesellschaft: Boeblingen Registergericht: Amtsgericht Stuttgart, HRB 243294