From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:25258 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727559AbgBFVie (ORCPT ); Thu, 6 Feb 2020 16:38:34 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 016LaIUh132609 for ; Thu, 6 Feb 2020 16:38:33 -0500 Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103]) by mx0b-001b2d01.pphosted.com with ESMTP id 2y0neckcdt-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 06 Feb 2020 16:38:32 -0500 Received: from localhost by e06smtp07.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 6 Feb 2020 21:38:30 -0000 From: Eric Farman Subject: [RFC PATCH v2 2/9] vfio-ccw: Register a chp_event callback for vfio-ccw Date: Thu, 6 Feb 2020 22:38:18 +0100 In-Reply-To: <20200206213825.11444-1-farman@linux.ibm.com> References: <20200206213825.11444-1-farman@linux.ibm.com> Message-Id: <20200206213825.11444-3-farman@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Cornelia Huck Cc: Halil Pasic , Jason Herne , Jared Rossi , Eric Farman , linux-s390@vger.kernel.org, kvm@vger.kernel.org From: Farhan Ali Register the chp_event callback to receive channel path related events for the subchannels managed by vfio-ccw. Signed-off-by: Farhan Ali Signed-off-by: Eric Farman --- Notes: v1->v2: - Move s390dbf before cio_update_schib() call [CH] v0->v1: [EF] - Add s390dbf trace drivers/s390/cio/vfio_ccw_drv.c | 44 +++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c index 91989269faf1..a99705e2fd73 100644 --- a/drivers/s390/cio/vfio_ccw_drv.c +++ b/drivers/s390/cio/vfio_ccw_drv.c @@ -19,6 +19,7 @@ #include +#include "chp.h" #include "ioasm.h" #include "css.h" #include "vfio_ccw_private.h" @@ -257,6 +258,48 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int process) return rc; } +static int vfio_ccw_chp_event(struct subchannel *sch, + struct chp_link *link, int event) +{ + struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + int mask = chp_ssd_get_mask(&sch->ssd_info, link); + int retry = 255; + + if (!private || !mask) + return 0; + + VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n", + mdev_uuid(private->mdev), sch->schid.cssid, + sch->schid.ssid, sch->schid.sch_no, + mask, event); + + if (cio_update_schib(sch)) + return -ENODEV; + + switch (event) { + case CHP_VARY_OFF: + /* Path logically turned off */ + sch->opm &= ~mask; + sch->lpm &= ~mask; + break; + case CHP_OFFLINE: + /* Path is gone */ + cio_cancel_halt_clear(sch, &retry); + break; + case CHP_VARY_ON: + /* Path logically turned on */ + sch->opm |= mask; + sch->lpm |= mask; + break; + case CHP_ONLINE: + /* Path became available */ + sch->lpm |= mask & sch->opm; + break; + } + + return 0; +} + static struct css_device_id vfio_ccw_sch_ids[] = { { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, { /* end of list */ }, @@ -274,6 +317,7 @@ static struct css_driver vfio_ccw_sch_driver = { .remove = vfio_ccw_sch_remove, .shutdown = vfio_ccw_sch_shutdown, .sch_event = vfio_ccw_sch_event, + .chp_event = vfio_ccw_chp_event, }; static int __init vfio_ccw_debug_init(void) -- 2.17.1