From patchwork Tue May 5 12:27:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Farman X-Patchwork-Id: 11528921 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28F4514B4 for ; Tue, 5 May 2020 12:31:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 155FF206A5 for ; Tue, 5 May 2020 12:31:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728695AbgEEMbY (ORCPT ); Tue, 5 May 2020 08:31:24 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:27282 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728609AbgEEMbY (ORCPT ); Tue, 5 May 2020 08:31:24 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 045CVIS6050068; Tue, 5 May 2020 08:31:23 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 30s317ud05-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 05 May 2020 08:31:22 -0400 Received: from m0098413.ppops.net (m0098413.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 045CVLRm050313; Tue, 5 May 2020 08:31:22 -0400 Received: from ppma03ams.nl.ibm.com (62.31.33a9.ip4.static.sl-reverse.com [169.51.49.98]) by mx0b-001b2d01.pphosted.com with ESMTP id 30s317ucgg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 05 May 2020 08:31:21 -0400 Received: from pps.filterd (ppma03ams.nl.ibm.com [127.0.0.1]) by ppma03ams.nl.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 045CQCBx025415; Tue, 5 May 2020 12:27:48 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma03ams.nl.ibm.com with ESMTP id 30s0g5py2f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 05 May 2020 12:27:48 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 045CRjmR8782194 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 5 May 2020 12:27:46 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CCB2511C04A; Tue, 5 May 2020 12:27:45 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B36D211C052; Tue, 5 May 2020 12:27:45 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 5 May 2020 12:27:45 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id 28373E11E2; Tue, 5 May 2020 14:27:45 +0200 (CEST) From: Eric Farman To: linux-s390@vger.kernel.org, kvm@vger.kernel.org Cc: Cornelia Huck , Halil Pasic , Jason Herne , Jared Rossi , Eric Farman Subject: [PATCH v4 7/8] vfio-ccw: Wire up the CRW irq and CRW region Date: Tue, 5 May 2020 14:27:44 +0200 Message-Id: <20200505122745.53208-8-farman@linux.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200505122745.53208-1-farman@linux.ibm.com> References: <20200505122745.53208-1-farman@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-05-05_06:2020-05-04,2020-05-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=2 mlxscore=0 spamscore=0 malwarescore=0 mlxlogscore=999 adultscore=0 bulkscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005050093 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Farhan Ali Use the IRQ to notify userspace that there is a CRW pending in the region, related to path-availability changes on the passthrough subchannel. Signed-off-by: Farhan Ali Signed-off-by: Eric Farman Reviewed-by: Cornelia Huck --- Notes: v3->v4: - s/vfio_ccw_alloc_crw()/vfio_ccw_queue_crw()/ [CH] - Remove cssid from crw that is built [CH] v2->v3: - Refactor vfio_ccw_alloc_crw() to accept rsc, erc, and rsid fields of a CRW as input [CH] - Copy the right amount of CRWs to the crw_region [EF] - Use sizeof(target) for the memcpy, rather than sizeof(source) [EF] - Ensure the CRW region is empty if no CRW is present [EF/CH] - Refactor how data goes from private-to-region-to-user [CH] - Reduce the number of CRWs from two to one [CH] - s/vc_crw/crw/ [EF] v1->v2: - Remove extraneous 0x0 in crw.rsid assignment [CH] - Refactor the building/queueing of a crw into its own routine [EF] v0->v1: [EF] - Place the non-refactoring changes from the previous patch here - Clean up checkpatch (whitespace) errors - s/chp_crw/crw/ - Move acquire/release of io_mutex in vfio_ccw_crw_region_read() into patch that introduces that region - Remove duplicate include from vfio_ccw_drv.c - Reorder include in vfio_ccw_private.h drivers/s390/cio/vfio_ccw_chp.c | 17 ++++++++++ drivers/s390/cio/vfio_ccw_drv.c | 49 +++++++++++++++++++++++++++++ drivers/s390/cio/vfio_ccw_private.h | 8 +++++ 3 files changed, 74 insertions(+) diff --git a/drivers/s390/cio/vfio_ccw_chp.c b/drivers/s390/cio/vfio_ccw_chp.c index 37ea344a4d72..876f6ade51cc 100644 --- a/drivers/s390/cio/vfio_ccw_chp.c +++ b/drivers/s390/cio/vfio_ccw_chp.c @@ -82,14 +82,24 @@ static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private, unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS; loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK; struct ccw_crw_region *region; + struct vfio_ccw_crw *crw; int ret; if (pos + count > sizeof(*region)) return -EINVAL; + crw = list_first_entry_or_null(&private->crw, + struct vfio_ccw_crw, next); + + if (crw) + list_del(&crw->next); + mutex_lock(&private->io_mutex); region = private->region[i].data; + if (crw) + memcpy(®ion->crw, &crw->crw, sizeof(region->crw)); + if (copy_to_user(buf, (void *)region + pos, count)) ret = -EFAULT; else @@ -98,6 +108,13 @@ static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private, region->crw = 0; mutex_unlock(&private->io_mutex); + + kfree(crw); + + /* Notify the guest if more CRWs are on our queue */ + if (!list_empty(&private->crw) && private->crw_trigger) + eventfd_signal(private->crw_trigger, 1); + return ret; } diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c index e4deae6fd525..9144360851ed 100644 --- a/drivers/s390/cio/vfio_ccw_drv.c +++ b/drivers/s390/cio/vfio_ccw_drv.c @@ -108,6 +108,16 @@ static void vfio_ccw_sch_io_todo(struct work_struct *work) eventfd_signal(private->io_trigger, 1); } +static void vfio_ccw_crw_todo(struct work_struct *work) +{ + struct vfio_ccw_private *private; + + private = container_of(work, struct vfio_ccw_private, crw_work); + + if (!list_empty(&private->crw) && private->crw_trigger) + eventfd_signal(private->crw_trigger, 1); +} + /* * Css driver callbacks */ @@ -186,7 +196,9 @@ static int vfio_ccw_sch_probe(struct subchannel *sch) if (ret) goto out_free; + INIT_LIST_HEAD(&private->crw); INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo); + INIT_WORK(&private->crw_work, vfio_ccw_crw_todo); atomic_set(&private->avail, 1); private->state = VFIO_CCW_STATE_STANDBY; @@ -217,9 +229,15 @@ static int vfio_ccw_sch_probe(struct subchannel *sch) static int vfio_ccw_sch_remove(struct subchannel *sch) { struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + struct vfio_ccw_crw *crw, *temp; vfio_ccw_sch_quiesce(sch); + list_for_each_entry_safe(crw, temp, &private->crw, next) { + list_del(&crw->next); + kfree(crw); + } + vfio_ccw_mdev_unreg(sch); dev_set_drvdata(&sch->dev, NULL); @@ -281,6 +299,33 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int process) return rc; } +static void vfio_ccw_queue_crw(struct vfio_ccw_private *private, + unsigned int rsc, + unsigned int erc, + unsigned int rsid) +{ + struct vfio_ccw_crw *crw; + + /* + * If unable to allocate a CRW, just drop the event and + * carry on. The guest will either see a later one or + * learn when it issues its own store subchannel. + */ + crw = kzalloc(sizeof(*crw), GFP_ATOMIC); + if (!crw) + return; + + /* + * Build the CRW based on the inputs given to us. + */ + crw->crw.rsc = rsc; + crw->crw.erc = erc; + crw->crw.rsid = rsid; + + list_add_tail(&crw->next, &private->crw); + queue_work(vfio_ccw_work_q, &private->crw_work); +} + static int vfio_ccw_chp_event(struct subchannel *sch, struct chp_link *link, int event) { @@ -311,6 +356,8 @@ static int vfio_ccw_chp_event(struct subchannel *sch, /* Path is gone */ if (sch->schib.pmcw.lpum & mask) cio_cancel_halt_clear(sch, &retry); + vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_PERRN, + link->chpid.id); break; case CHP_VARY_ON: /* Path logically turned on */ @@ -320,6 +367,8 @@ static int vfio_ccw_chp_event(struct subchannel *sch, case CHP_ONLINE: /* Path became available */ sch->lpm |= mask & sch->opm; + vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_INIT, + link->chpid.id); break; } diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index 97131b4df0b9..8723156b29ea 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -17,6 +17,7 @@ #include #include #include +#include #include #include "css.h" @@ -59,6 +60,11 @@ int vfio_ccw_register_async_dev_regions(struct vfio_ccw_private *private); int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private); int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private); +struct vfio_ccw_crw { + struct list_head next; + struct crw crw; +}; + /** * struct vfio_ccw_private * @sch: pointer to the subchannel @@ -98,10 +104,12 @@ struct vfio_ccw_private { struct channel_program cp; struct irb irb; union scsw scsw; + struct list_head crw; struct eventfd_ctx *io_trigger; struct eventfd_ctx *crw_trigger; struct work_struct io_work; + struct work_struct crw_work; } __aligned(8); extern int vfio_ccw_mdev_reg(struct subchannel *sch);