From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CB7E3C2BCA1 for ; Fri, 7 Jun 2019 10:43:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A00CD20B7C for ; Fri, 7 Jun 2019 10:43:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A00CD20B7C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48182 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hZCLG-0007Qe-Ti for qemu-devel@archiver.kernel.org; Fri, 07 Jun 2019 06:43:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54514) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hZBYV-0001qF-DF for qemu-devel@nongnu.org; Fri, 07 Jun 2019 05:53:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hZBYR-0000g0-SJ for qemu-devel@nongnu.org; Fri, 07 Jun 2019 05:53:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55510) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hZBYR-0000Iy-HP; Fri, 07 Jun 2019 05:52:59 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B08A7C04AC69; Fri, 7 Jun 2019 09:52:43 +0000 (UTC) Received: from localhost (dhcp-192-191.str.redhat.com [10.33.192.191]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3A9538274F; Fri, 7 Jun 2019 09:52:43 +0000 (UTC) From: Cornelia Huck To: Peter Maydell Date: Fri, 7 Jun 2019 11:52:04 +0200 Message-Id: <20190607095237.11364-3-cohuck@redhat.com> In-Reply-To: <20190607095237.11364-1-cohuck@redhat.com> References: <20190607095237.11364-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 07 Jun 2019 09:52:43 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 02/35] vfio-ccw: support async command subregion X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eric Farman , qemu-s390x@nongnu.org, Cornelia Huck , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" A vfio-ccw device may provide an async command subregion for issuing halt/clear subchannel requests. If it is present, use it for sending halt/clear request to the device; if not, fall back to emulation (as done today). Message-Id: <20190507154733.28604-3-cohuck@redhat.com> Reviewed-by: Eric Farman Signed-off-by: Cornelia Huck --- hw/s390x/css.c | 27 +++++++-- hw/vfio/ccw.c | 110 +++++++++++++++++++++++++++++++++++- include/hw/s390x/s390-ccw.h | 3 + 3 files changed, 134 insertions(+), 6 deletions(-) diff --git a/hw/s390x/css.c b/hw/s390x/css.c index ad310b9f94bc..18d38de39a17 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -22,6 +22,7 @@ #include "trace.h" #include "hw/s390x/s390_flic.h" #include "hw/s390x/s390-virtio-ccw.h" +#include "hw/s390x/s390-ccw.h" =20 typedef struct CrwContainer { CRW crw; @@ -1205,6 +1206,26 @@ static void sch_handle_start_func_virtual(SubchDev= *sch) =20 } =20 +static void sch_handle_halt_func_passthrough(SubchDev *sch) +{ + int ret; + + ret =3D vfio_ccw_handle_halt(sch); + if (ret =3D=3D -ENOSYS) { + sch_handle_halt_func(sch); + } +} + +static void sch_handle_clear_func_passthrough(SubchDev *sch) +{ + int ret; + + ret =3D vfio_ccw_handle_clear(sch); + if (ret =3D=3D -ENOSYS) { + sch_handle_clear_func(sch); + } +} + static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch) { SCHIB *schib =3D &sch->curr_status; @@ -1244,11 +1265,9 @@ IOInstEnding do_subchannel_work_passthrough(SubchD= ev *sch) SCHIB *schib =3D &sch->curr_status; =20 if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) { - /* TODO: Clear handling */ - sch_handle_clear_func(sch); + sch_handle_clear_func_passthrough(sch); } else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) { - /* TODO: Halt handling */ - sch_handle_halt_func(sch); + sch_handle_halt_func_passthrough(sch); } else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) { return sch_handle_start_func_passthrough(sch); } diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index d9e39552e237..db97593196ad 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -2,9 +2,12 @@ * vfio based subchannel assignment support * * Copyright 2017 IBM Corp. + * Copyright 2019 Red Hat, Inc. + * * Author(s): Dong Jia Shi * Xiao Feng Ren * Pierre Morel + * Cornelia Huck * * This work is licensed under the terms of the GNU GPL, version 2 or (a= t * your option) any later version. See the COPYING file in the top-level @@ -32,6 +35,9 @@ struct VFIOCCWDevice { uint64_t io_region_size; uint64_t io_region_offset; struct ccw_io_region *io_region; + uint64_t async_cmd_region_size; + uint64_t async_cmd_region_offset; + struct ccw_cmd_region *async_cmd_region; EventNotifier io_notifier; bool force_orb_pfch; bool warned_orb_pfch; @@ -114,6 +120,87 @@ again: } } =20 +int vfio_ccw_handle_clear(SubchDev *sch) +{ + S390CCWDevice *cdev =3D sch->driver_data; + VFIOCCWDevice *vcdev =3D DO_UPCAST(VFIOCCWDevice, cdev, cdev); + struct ccw_cmd_region *region =3D vcdev->async_cmd_region; + int ret; + + if (!vcdev->async_cmd_region) { + /* Async command region not available, fall back to emulation */ + return -ENOSYS; + } + + memset(region, 0, sizeof(*region)); + region->command =3D VFIO_CCW_ASYNC_CMD_CSCH; + +again: + ret =3D pwrite(vcdev->vdev.fd, region, + vcdev->async_cmd_region_size, vcdev->async_cmd_region_o= ffset); + if (ret !=3D vcdev->async_cmd_region_size) { + if (errno =3D=3D EAGAIN) { + goto again; + } + error_report("vfio-ccw: write cmd region failed with errno=3D%d"= , errno); + ret =3D -errno; + } else { + ret =3D region->ret_code; + } + switch (ret) { + case 0: + case -ENODEV: + case -EACCES: + return 0; + case -EFAULT: + default: + sch_gen_unit_exception(sch); + css_inject_io_interrupt(sch); + return 0; + } +} + +int vfio_ccw_handle_halt(SubchDev *sch) +{ + S390CCWDevice *cdev =3D sch->driver_data; + VFIOCCWDevice *vcdev =3D DO_UPCAST(VFIOCCWDevice, cdev, cdev); + struct ccw_cmd_region *region =3D vcdev->async_cmd_region; + int ret; + + if (!vcdev->async_cmd_region) { + /* Async command region not available, fall back to emulation */ + return -ENOSYS; + } + + memset(region, 0, sizeof(*region)); + region->command =3D VFIO_CCW_ASYNC_CMD_HSCH; + +again: + ret =3D pwrite(vcdev->vdev.fd, region, + vcdev->async_cmd_region_size, vcdev->async_cmd_region_o= ffset); + if (ret !=3D vcdev->async_cmd_region_size) { + if (errno =3D=3D EAGAIN) { + goto again; + } + error_report("vfio-ccw: write cmd region failed with errno=3D%d"= , errno); + ret =3D -errno; + } else { + ret =3D region->ret_code; + } + switch (ret) { + case 0: + case -EBUSY: + case -ENODEV: + case -EACCES: + return 0; + case -EFAULT: + default: + sch_gen_unit_exception(sch); + css_inject_io_interrupt(sch); + return 0; + } +} + static void vfio_ccw_reset(DeviceState *dev) { CcwDevice *ccw_dev =3D DO_UPCAST(CcwDevice, parent_obj, dev); @@ -287,9 +374,13 @@ static void vfio_ccw_get_region(VFIOCCWDevice *vcdev= , Error **errp) return; } =20 + /* + * We always expect at least the I/O region to be present. We also + * may have a variable number of regions governed by capabilities. + */ if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) { - error_setg(errp, "vfio: Unexpected number of the I/O region %u", - vdev->num_regions); + error_setg(errp, "vfio: too few regions (%u), expected at least = %u", + vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1); return; } =20 @@ -309,11 +400,26 @@ static void vfio_ccw_get_region(VFIOCCWDevice *vcde= v, Error **errp) vcdev->io_region_offset =3D info->offset; vcdev->io_region =3D g_malloc0(info->size); =20 + /* check for the optional async command region */ + ret =3D vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW, + VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &i= nfo); + if (!ret) { + vcdev->async_cmd_region_size =3D info->size; + if (sizeof(*vcdev->async_cmd_region) !=3D vcdev->async_cmd_regio= n_size) { + error_setg(errp, "vfio: Unexpected size of the async cmd reg= ion"); + g_free(info); + return; + } + vcdev->async_cmd_region_offset =3D info->offset; + vcdev->async_cmd_region =3D g_malloc0(info->size); + } + g_free(info); } =20 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev) { + g_free(vcdev->async_cmd_region); g_free(vcdev->io_region); } =20 diff --git a/include/hw/s390x/s390-ccw.h b/include/hw/s390x/s390-ccw.h index 901d805d79a3..e9c7e1db5761 100644 --- a/include/hw/s390x/s390-ccw.h +++ b/include/hw/s390x/s390-ccw.h @@ -37,4 +37,7 @@ typedef struct S390CCWDeviceClass { IOInstEnding (*handle_request) (SubchDev *sch); } S390CCWDeviceClass; =20 +int vfio_ccw_handle_clear(SubchDev *sch); +int vfio_ccw_handle_halt(SubchDev *sch); + #endif --=20 2.20.1